JP2010219575A - Image reading apparatus, original carrier/reader and copying machine - Google Patents

Abstract

An image reading apparatus, a document conveying / reading apparatus, and a copying machine capable of extending the life of a cleaning member and suppressing damage to contact glass are provided.
When a first contact glass moves in the same direction as the document conveyance direction, a cleaning member comes into contact with the document conveyance surface of the first contact glass. When the first contact glass 154 moves to the downstream end in the document conveyance direction of the first contact glass movable range, and the first contact glass 154 moves in the direction opposite to the document conveyance direction, the cleaning member 301 moves the document on the first contact glass 154. Separate from the transfer surface. When the first contact glass 154 moves to the upstream end of the first contact glass movable range in the document conveyance direction, the cleaning member 301 comes into contact with the document conveyance surface of the first contact glass 154 again.
[Selection] Figure 8

Description

  The present invention relates to a sheet-through type image reading apparatus, and a document conveyance reading apparatus and a copying machine using the same.

  2. Description of the Related Art Conventionally, there is known a sheet-through type image reading apparatus that performs a sub-scan of a document image by conveying a document in a sub-scanning direction and passing the conveyed document through a fixed reading position. It has been. The reading position by the image reading unit is used to transmit light emitted from the light source inside the image reading unit toward the external document or light reflected from the image surface of the document and traveling toward the inside of the image reading unit. Contact glass is provided. In this type of image reading apparatus, when a document image is read, the document passes while contacting the contact glass. Therefore, adhesion of dust or the like on the image surface side of the document on the contact glass is inevitable. Furthermore, when this deposit adheres to the reading position of the contact glass, the influence appears on the read image signal, and the image is deteriorated. Deposits such as dust on the contact glass lead to image deterioration not only in the sheet-through type but also in any type of image reading apparatus. However, in an image reading apparatus that reads an image by fixing the original and moving the reading unit in the sub-scanning direction, the effect only appears as a “point” on the image, whereas an image of the sheet-through method is used. In the reading device, a so-called vertical streak connected in the sub-scanning direction results in significant image deterioration.

Japanese Patent Application Laid-Open No. 2004-228561 describes a document reading apparatus provided with a moving means for reciprocating the contact glass and a cleaning member fixed to the document reading apparatus main body so as to be in contact with the upper surface of the contact glass. The cleaning member is provided in the vicinity of the upstream end of the document conveying direction on the contact glass. When reading a document image, the contact glass is moved in the same direction as the document transport direction. As a result, the document image is always read at a different position on the contact glass, and even if dust or the like adheres to the contact glass, it is possible to suppress deterioration in image quality due to vertical stripes.
After reading the document image, the contact glass is slid to the cleaning member side (the direction opposite to the document transport direction). Then, dust adhering to the part that passes over the reading position when reading the image on the contact glass is blocked by the surface on the reading position side of the cleaning member, and adheres to the part on the contact glass that passes the reading position when reading the image. Deposited material such as dust is collected by the cleaning member at the downstream side in the document transport direction from the portion passing over the reading position when reading the image on the contact glass. As described above, dust attached to a portion passing through the reading position when reading an image on the contact glass can be removed by the cleaning member, and the dust attached to the contact glass is suppressed from being read by the reading device, and the vertical stripe on the image. Can be suppressed.

However, in Patent Document 1, as described above, the cleaning member always comes into contact with the contact glass document conveying surface. For this reason, when the contact glass is moved to the cleaning member side, the dust that passes through the reading position when the image is read on the contact glass attached when the image is read is cleaned. As a result, when the movement of the contact glass toward the cleaning member is completed, the dust collected by the cleaning member is closer to the reading position than the cleaning member. For this reason, when the contact glass is moved away from the cleaning member for reading a document image (the same direction as the document transport direction), dust collected on the contact glass by the cleaning member passes through the reading position. Then, the leading edge of the document reaches the reading position and the image is read. Therefore, dust on the contact glass collected by the cleaning member is present on the document conveyance path between the reading position and the scooping guide member. As a result, the document passing through the reading position collides with the dust on the contact glass collected by the cleaning member, disperses the dust, and again adheres to the location that passes over the reading position when the contact glass image is read. There is a fear. Therefore, there is a problem that the possibility of occurrence of vertical stripes in the image cannot be completely eliminated.
In addition, the contact glass moves forward (moves in the same direction as the original conveyance direction) even though it has been cleaned by the backward movement of the contact glass (movement in the direction opposite to the original conveyance direction) performed in advance. Even at this time, the cleaning member rubs the document conveying surface. As a result, there is also a problem that the cleaning member is worn out early and the life of the cleaning member is shortened. Furthermore, there is a problem that the document conveying surface of the contact glass is likely to be damaged by rubbing against the cleaning member.

  Further, the cleaning of the document conveying surface of the contact glass has been described so far. For example, the cleaning member relatively moves back and forth on the guide surface of the guide member that moves integrally with the contact glass, so that the guide surface of the guide member moves to the guide surface. The same problem may occur even in an image reading apparatus that removes attached deposits.

  The present invention has been made in view of the above problems, and a first object is to prevent the dust cleaned by the cleaning member from adhering again to a position corresponding to the reading position on the contact glass. Another object of the present invention is to provide an image reading apparatus, an original conveying / reading apparatus, and a copying machine that can extend the life of a cleaning member and suppress damage to an original conveying surface.

  A second object of the present invention is to provide an image reading apparatus, a document conveying / reading apparatus, and a copying machine that can extend the life of a guide cleaning member.

In order to achieve the above object, the invention according to claim 1 is an image reading apparatus for reading an image of a document that has been conveyed at a reading position on the contact glass with a reading unit fixed, and for conveying the document on the contact glass. A cleaning member that contacts the surface and cleans the document conveying surface, a moving means that reciprocates the contact glass in the document conveying direction, and a cleaning member contact that contacts and separates the cleaning member from the document conveying surface of the contact glass. And a separating means.
The invention according to claim 2 is the image reading apparatus according to claim 1, wherein the cleaning member contacting / separating means causes the contact glass to move from the contact glass original conveying surface when the contact glass moves forward or backward. The cleaning member is separated.
According to a third aspect of the present invention, in the image reading apparatus according to the second aspect, the contact glass contacts the document conveying surface of the contact glass when the contact glass moves in a direction away from the cleaning member. The cleaning member contacting / separating means is configured.
According to a fourth aspect of the present invention, in the image reading apparatus according to any one of the first to third aspects, the reciprocating movement of the contact glass and the contact / separation operation of the cleaning member are performed by the same driving source. It is.
According to a fifth aspect of the present invention, in the image reading apparatus according to the fourth aspect, the cleaning member contacting / separating means includes a guide pin provided on the cleaning member and a loop-shaped guide groove that engages with the guide pin. A cleaning member guide member that moves integrally with the contact glass, and the guide groove is at least separated from the document conveying surface of the contact glass when the guide groove moves in one direction of the contact glass. A portion for guiding the guide pin from a position away from the document conveying surface of the contact glass to a position close to the contact glass when the contact glass moves to one end of the movable range of the contact glass; When the contact glass moves in the other direction, the guide pin is positioned close to the document conveying surface of the contact glass. It is characterized in that it has a portion for guiding parallel to the guide pin with respect to the document transport surface of the contact glass.
According to a sixth aspect of the present invention, there is provided a document conveying / reading apparatus comprising: an image reading device that reads an image recorded on a document; and a document conveying unit that conveys the document to a document reading position by the image reading device. A reading device according to any one of claims 1 to 5 is used.
According to a seventh aspect of the present invention, in the document conveying / reading device according to the sixth aspect, the document conveying means is attached to the image reading device so as to be freely opened and closed, and when the document conveying means is opened, The cleaning member is brought into contact with the contact glass.
According to an eighth aspect of the present invention, in the image reading apparatus that reads an image of a document that has been conveyed at a reading position on the contact glass while fixing the reading unit, the contact glass is moved back and forth in the document conveyance direction. Means, a guide member that moves integrally with the contact glass, guides the document, a guide cleaning member that contacts the document guide surface of the guide member and cleans the document guide surface, and the guide cleaning member Guide cleaning member contacting / separating means for contacting / separating the guide member with respect to the document guide surface is provided.
According to a ninth aspect of the present invention, in the image reading apparatus according to the eighth aspect, the guide cleaning member contacting / separating means moves the guide glass from the document guide surface when the contact glass moves forward or backward. The cleaning member is separated.
According to a tenth aspect of the present invention, in the image reading apparatus according to the ninth aspect, the guide cleaning member is brought into contact with the document guide surface when the guide member moves in a direction away from the guide cleaning member. The cleaning member contacting / separating means is configured.
According to an eleventh aspect of the present invention, in the image reading apparatus according to any one of the eighth to tenth aspects, the moving unit and the guide cleaning member contacting / separating unit are driven by the same driving source. Is.
According to a twelfth aspect of the present invention, in the image reading apparatus according to the eleventh aspect, the guide cleaning member contacting / separating means includes a guide pin provided on a holding member that holds the guide cleaning member so as to be movable up and down, and the guide pin. A loop-shaped guide groove to be engaged is formed, and the guide cleaning member guide moves integrally with the guide member, and the guide groove is at least when the contact glass moves in one direction. A portion for guiding the guide pin in a direction away from the guide glass, and guiding the guide pin from a position away from the document guide surface to a position adjacent to the contact glass when the contact glass moves to one end of the movable range of the contact glass. And when the guide pin moves in the other direction of the contact glass, the guide pin is close to the document guide surface. It is characterized in that it has a portion for guiding parallel to the guide pin against the draft guide surface.
According to a thirteenth aspect of the present invention, there is provided a document conveying and reading apparatus comprising: an image reading device that reads an image recorded on a document; and a document conveying unit that conveys the document to a document reading position by the image reading device. A reading device according to any one of claims 8 to 12 is used.
Further, the invention according to claim 14 is the document conveying / reading apparatus according to claim 13, wherein the document conveying means is attached to the image reading apparatus so as to be freely opened and closed, and when the document conveying means is opened, The guide cleaning member is brought into contact with the document guide surface.
According to a fifteenth aspect of the present invention, in the image reading apparatus according to any one of the first to fifth aspects, the guide member that moves integrally with the contact glass and guides a document, and the document guide surface of the guide member abuts. A guide cleaning member that contacts and cleans the document guide surface, and a guide cleaning member contacting / separating unit that contacts and separates the guide cleaning member with respect to the document guide surface are provided.
The invention according to claim 16 is the image reading apparatus according to claim 15, wherein the guide cleaning member contacting / separating means causes the guide from the document guide surface when the contact glass moves forward or backward. The cleaning member is separated.
According to a seventeenth aspect of the present invention, in the image reading apparatus according to the sixteenth aspect, the guide glass is caused to abut on the document guide surface when the contact glass moves in a direction away from the guide cleaning member. The cleaning member contacting / separating means is configured.
The invention according to claim 18 is the image reading apparatus according to any one of claims 15 to 17, characterized in that the moving means and the guide cleaning member contacting / separating means are driven by the same drive source. Is.
In the image reading apparatus according to claim 18, the guide cleaning member contacting / separating means includes a guide pin provided on a holding member that holds the guide cleaning member so as to be movable up and down, and the guide pin. A loop-shaped guide groove to be engaged is formed, and the guide cleaning member guide moves integrally with the guide member, and the guide groove is at least when the contact glass moves in one direction. A portion for guiding the guide pin in a direction away from the guide glass, and guiding the guide pin from a position away from the document guide surface to a position adjacent to the contact glass when the contact glass moves to one end of the movable range of the contact glass. And when the guide pin moves in the other direction of the contact glass, the guide pin is close to the document guide surface. It is characterized in that it has a portion for guiding parallel to the guide pin against the draft guide surface.
According to a twentieth aspect of the present invention, there is provided the document conveying / reading apparatus comprising: an image reading apparatus that reads an image recorded on a document; and a document conveying unit that conveys the document to a document reading position by the image reading apparatus. A reading device according to any one of claims 15 to 19 is used.
The invention according to claim 21 is the document conveying / reading apparatus according to claim 20, wherein the document conveying means is attached to the image reading device so as to be openable and closable, and when the document conveying means is opened, The guide cleaning member is brought into contact with the document guide surface, and the cleaning member is brought into contact with the contact glass document conveying surface.
According to a twenty-second aspect of the present invention, in the original document conveying / reading apparatus according to any one of the sixth, seventh, thirteenth, fourteenth, twenty-first, or twenty-first aspects, the original conveying means is attached to the image reading apparatus so as to be freely opened and closed. And a control means for controlling the moving means so as to move to the retracted position where the original conveying surface of the contact glass is not exposed when the original conveying means is opened.
The invention according to claim 23 provides the document conveying / reading apparatus according to claim 22, further comprising an opening speed detecting means for detecting an opening speed of the document conveying means, and the contact based on a detection result of the opening speed detecting means. The control means is configured to determine whether or not to perform control to move the glass to the retracted position.
The invention according to claim 24 provides the document conveying / reading apparatus according to claim 22 or 23, further comprising position detecting means for detecting the position of the contact glass when the opening operation of the document conveying means is started. The control means is configured to determine whether to perform control for moving the contact glass to the retracted position based on a detection result of the detection means.
According to a twenty-fifth aspect of the present invention, in the document conveying / reading apparatus according to any one of the twenty-second to twenty-fourth aspects, the control means includes a moving means for moving the contact glass to the retracted position when the document jam occurs. It is characterized by controlling.
According to a twenty-sixth aspect of the present invention, in the original conveying / reading apparatus of the twenty-fifth aspect, when the original is in the vicinity of the contact glass when the original is jammed, the control is performed so that the contact glass is not moved to the retracted position. It is characterized by comprising means.
According to a twenty-seventh aspect of the present invention, in the document conveying / reading apparatus according to any one of the twenty-second to twenty-sixth aspects, the control unit controls the moving unit to move the contact glass to the retracted position after the job ends. It is a feature.
The invention according to claim 28 is the document conveying / reading apparatus according to claim 27, further comprising a manual cleaning mode for manually cleaning the document conveying surface of the contact glass, wherein the control means is configured to execute the manual cleaning mode. The moving means is controlled to move the contact glass from the retracted position to a position where the original conveying surface of the contact glass is exposed when the conveying means is opened.
According to a twenty-ninth aspect of the present invention, an image forming unit that forms an image on a recording material and a document conveyance reading unit that reads an image of the document while conveying the document, the image read by the document conveyance reading unit is provided. Claims 6, 7, 13, 14, 20, 21, 21, 22, 23, and 24 are used as the document conveying and reading means in a copying machine for copying the document by being formed on the recording material by the image forming means. , 25, 26, 27, or 28 is used.

According to the first aspect of the present invention, if the cleaning member is separated from the document conveying surface of the contact glass by the cleaning member contacting / separating means during the forward movement or the backward movement of the contact glass, the following effects are obtained. Can be obtained. That is, only when the contact glass moves forward or backward, the cleaning member comes into contact with the contact glass document conveying surface, and the adhering matter attached to the position corresponding to the reading position on the document conveying surface can be removed. Thus, the cleaning member rubs against the contact glass document conveying surface only when the contact glass document conveying surface is cleaned by the cleaning member. Therefore, the lifetime of the cleaning member can be extended and damage to the contact glass can be suppressed as compared with the case where the cleaning member is always in contact with the contact glass document conveying surface.
In addition, when the contact glass moves in a direction away from the cleaning member, if the cleaning member is brought into contact with the contact glass, the dust on the contact glass cleaned by the cleaning member is closer to the reading position than the cleaning member. Collected on the separated side. Further, when the contact glass moves to the cleaning member side, the dust collected by the cleaning member moves in a direction away from the reading position. Therefore, the dust collected by the cleaning member is always located in a direction away from the reading position than the cleaning member. Since the document transport path is closer to the reading position than the cleaning member, dust collected by the cleaning member located farther from the reading position than the cleaning member does not collide with the document passing through the reading position. Therefore, it is possible to suppress dust collected by the cleaning member from adhering to a portion that passes through the reading position when the contact glass image is read again.

  According to the eighth to fourteenth aspects of the present invention, the guide cleaning member is separated from the document guide surface of the guide member by the guide cleaning member contacting / separating means when the contact glass moves forward or backward. The following effects can be obtained. That is, only when the guide member moves forward or backward, the guide cleaning member comes into contact with the document guide surface of the guide member, and the adhered matter adhering to the document guide surface can be removed. Therefore, the guide cleaning member rubs against the document guide surface only when the document guide surface is cleaned by the guide cleaning member. Therefore, the life of the guide cleaning member can be extended as compared with the case where the guide cleaning member is always in contact with the document guide surface.

1 is a schematic configuration diagram showing a copier according to an embodiment. FIG. 2 is a partially enlarged configuration diagram illustrating an enlarged part of an internal configuration of an image forming unit in the copier. FIG. 3 is a partially enlarged view showing a part of a tandem part including four process units in the image forming part. FIG. 2 is a perspective view showing a scanner and an ADF of the copier. The expanded block diagram which shows the principal part structure of the same ADF with the upper part of a scanner. FIG. 2 is a block diagram showing a part of an electric circuit of the copier. The block diagram which shows the principal part of the electric circuit of a 2nd fixed reading part. The enlarged block diagram which shows the periphery of a 1st surface fixed reading part Disassembled perspective view around the first surface fixed reading unit The perspective view of a glass moving mechanism. The perspective view which shows a 1st contact glass, an intermediate | middle guide member, and a scooping guide member. The figure which expanded a part of FIG. (A) is a figure explaining a mode that the guide cleaning member contact | abutted with the intermediate | middle guide member. (B) is a figure explaining a mode that the guide cleaning member was spaced apart from the intermediate guide member. FIG. 6 is a top view of the vicinity of the front side of the first surface fixed reading unit. The disassembled perspective view of the cleaning member contact / separation mechanism. The disassembled perspective view of a guide cleaning member contact / separation mechanism. The figure explaining the contact / separation operation | movement of a cleaning member, and the contact / separation operation | movement of a guide cleaning member. The expansion perspective view around a hinge. The figure seen from the B direction of FIG. The control flow figure when ADF is open | released at the time of 1st contact glass movement. The control flow figure of manual cleaning mode. FIG. 6 is a control flow diagram when a document jam occurs.

Hereinafter, an embodiment in which the present invention is applied to an electrophotographic copying machine (hereinafter simply referred to as a copying machine) will be described.
First, a basic configuration of the copying machine according to the present embodiment will be described. FIG. 1 is a schematic configuration diagram showing the copying machine. The copying machine includes an image forming unit 1 serving as an image forming unit, a blank paper supply device 40, and a document conveying / reading device 50. The document conveying / reading device 50 includes a scanner 150 as a document reading device fixed on the image forming unit 1 and an ADF 51 as a document conveying device supported by the scanner 150.

  The blank paper supply device 40 includes two paper feed cassettes 42 arranged in multiple stages in the paper bank 41, a feed roller 43 that feeds transfer paper from the paper feed cassette, and separates the sent transfer paper into a paper feed path 44. A separation roller 45 to be supplied is provided. In addition, a plurality of conveyance rollers 47 that convey the transfer paper to the paper feed path 37 of the image forming unit 1 are also provided. Then, the transfer paper in the paper feed cassette is fed into the paper feed path 37 in the image forming unit 1.

  FIG. 2 is a partially enlarged configuration diagram illustrating a part of the internal configuration of the image forming unit in an enlarged manner. The image forming unit 1 as an image forming unit includes an optical writing device 2, four process units 3K, Y, M, and C that form K, Y, M, and C toner images, a transfer unit 24, and paper conveyance. A unit 28, a registration roller pair 33, a fixing device 34, a switchback device 36, a paper feed path 37, and the like are provided. Then, a light source such as a laser diode or LED (not shown) disposed in the optical writing device 2 is driven to irradiate the four drum-shaped photosensitive members 4K, Y, M, and C with the laser light L. . By this irradiation, electrostatic latent images are formed on the surfaces of the photoreceptors 4K, Y, M, and C, and the latent images are developed into toner images via a predetermined development process. Note that the subscripts K, Y, M, and C added after the reference numerals indicate specifications for black, yellow, magenta, and cyan.

  The process units 3K, 3Y, 3C, and 3C support the photosensitive member and the various devices disposed around it as a single unit on a common support, and with respect to the image forming unit 1 main body. Detachable. Taking the process unit 3K for black as an example, this has a developing device 6K for developing the electrostatic latent image formed on the surface of the photosensitive member 4K into a black toner image in addition to the photoreceptor 4K. Further, it also includes a drum cleaning device 15 that cleans transfer residual toner adhering to the surface of the photoreceptor 4K after passing through a K primary transfer nip described later. This copying machine has a so-called tandem type configuration in which four process units 3K, Y, M, and C are arranged so as to face an intermediate transfer belt 25 (to be described later) along the endless movement direction. Yes.

  FIG. 3 is a partially enlarged view showing a part of a tandem part composed of four process units 3K, Y, M, and C. Since the four process units 3K, Y, M, and C have substantially the same configuration except that the colors of the toners to be used are different from each other, K, Y, M, and C attached to the respective reference numerals in FIG. The subscript is omitted. As shown in the figure, the process unit 3 includes a charging device 23, a developing device 6, a drum cleaning device 15, a charge removal lamp 22, and the like around the photoreceptor 4.

  As the photoreceptor 4, a drum-shaped member is used in which a photosensitive layer is formed by applying a photosensitive organic photosensitive material to a base tube made of aluminum or the like. However, an endless belt may be used.

  The developing device 6 develops the latent image using a two-component developer containing a magnetic carrier and a nonmagnetic toner (not shown). In order to transfer the toner in the two-component developer carried on the developing sleeve 12 to the photosensitive member 4, the agitating unit 7 that conveys the two-component developer accommodated in the inside and supplies the developing sleeve 12 with stirring. Development section 11.

  The stirring unit 7 is provided at a position lower than the developing unit 11, and is provided on the bottom surface of the developing case 9, two conveying screws 8 arranged in parallel to each other, a partition plate provided between these screws. The toner density sensor 10 is included.

  The developing unit 11 includes a developing sleeve 12 that faces the photosensitive member 4 through the opening of the developing case 9, a magnet roller 13 that is non-rotatably provided inside the developing sleeve 12, a doctor blade 14 that approaches the developing sleeve 12, and the like. ing. The developing sleeve 12 has a non-magnetic rotatable cylindrical shape. The magnet roller 13 has a plurality of magnetic poles that are sequentially arranged from the position facing the doctor blade 14 in the rotational direction of the sleeve. Each of these magnetic poles applies a magnetic force to the two-component developer on the sleeve at a predetermined position in the rotation direction. As a result, the two-component developer sent from the stirring unit 7 is attracted and carried on the surface of the developing sleeve 12 and a magnetic brush is formed along the magnetic field lines on the sleeve surface.

  The magnetic brush is regulated to an appropriate layer thickness when passing through the position facing the doctor blade 14 as the developing sleeve 12 rotates, and then conveyed to the developing region facing the photoconductor 4. Then, the toner is transferred onto the electrostatic latent image by the potential difference between the developing bias applied to the developing sleeve 12 and the electrostatic latent image on the photosensitive member 4, thereby contributing to development. Further, as the developing sleeve 12 rotates, the developing sleeve 12 is returned to the developing portion 11 again, and after being separated from the sleeve surface by the influence of the repulsive magnetic field formed between the magnetic poles of the magnet roller 13, the developing sleeve 12 is returned to the stirring portion 7. An appropriate amount of toner is supplied to the two-component developer in the stirring unit 7 based on the detection result of the toner density sensor 10. The developing device 6 may employ a one-component developer that does not include a magnetic carrier, instead of one that uses a two-component developer.

  As the drum cleaning device 15, a system in which a polyurethane rubber cleaning blade 16 is pressed against the photosensitive member 4 is used, but another system may be used. For the purpose of enhancing the cleaning property, this example employs a system having a contact conductive fur brush 17 whose outer peripheral surface is in contact with the photoreceptor 4 so as to be rotatable in the direction of the arrow in the figure. The fur brush 17 also serves to apply the lubricant to the surface of the photosensitive member 4 while scraping the lubricant from a solid lubricant (not shown) into a fine powder. A metal electric field roller 18 for applying a bias to the fur brush 17 is rotatably provided in the direction of the arrow in the figure, and the tip of the scraper 19 is pressed against it. The toner attached to the fur brush 17 is transferred to the electric field roller 18 to which a bias is applied while rotating in contact with the fur brush 17 in the counter direction. Then, after being scraped from the electric field roller 18 by the scraper 19, it falls onto the recovery screw 20. The collection screw 20 conveys the collected toner toward the end of the drum cleaning device 15 in the direction orthogonal to the drawing sheet surface, and transfers it to the external recycling conveyance device 21. The recycle transport device 21 sends the delivered toner to the developing device 6 for recycling.

  The neutralization lamp 22 neutralizes the photoreceptor 4 by light irradiation. The surface of the photoreceptor 4 that has been neutralized is uniformly charged by the charging device 23 and then subjected to optical writing processing by the optical writing device 2. As the charging device 23, a charging device that rotates a charging roller to which a charging bias is applied while contacting the photosensitive member 4 is used. A scorotron charger or the like that performs a non-contact charging process on the photoreceptor 4 may be used.

  In FIG. 2 described above, K, Y, M, and C toner images are formed on the photoreceptors 4K, Y, M, and C of the four process units 3K, Y, M, and C by the processes described above. Is done.

  A transfer unit 24 is disposed below the four process units 3K, Y, M, and C. The transfer unit 24 moves the intermediate transfer belt 25 stretched by a plurality of rollers endlessly in the clockwise direction in the drawing while contacting the photoreceptors 4K, Y, M, and C. As a result, primary transfer nips for K, Y, M, and C in which the photoreceptors 4K, Y, M, and C contact the intermediate transfer belt 25 are formed. In the vicinity of the primary transfer nips for K, Y, M, and C, the intermediate transfer belt 25 is moved to the photoreceptors 4K, Y, M, and C by primary transfer rollers 26K, Y, M, and C disposed inside the belt loop. Pressing toward C. A primary transfer bias is applied to the primary transfer rollers 26K, Y, M, and C by a power source (not shown). As a result, a primary transfer electric field for electrostatically moving the toner images on the photoreceptors 4K, Y, M, and C toward the intermediate transfer belt 25 is formed in the primary transfer nips for K, Y, M, and C. Has been. In the drawing, a toner image is formed on each of the primary transfer nips on the front surface of the intermediate transfer belt 25 that sequentially passes through the primary transfer nips for K, Y, M, and C with endless movement in the clockwise direction. Are sequentially superimposed and primarily transferred. By this primary transfer of superposition, a four-color superposed toner image (hereinafter referred to as a four-color toner image) is formed on the front surface of the intermediate transfer belt 25.

  Below the transfer unit 24 in the figure, a paper transport unit 28 is provided between the drive roller 30 and the secondary transfer roller 31 to endlessly move the endless paper transport belt 29. The intermediate transfer belt 25 and the paper transport belt 29 are sandwiched between the secondary transfer roller 31 and the lower stretching roller 27 of the transfer unit 24. As a result, a secondary transfer nip is formed in which the front surface of the intermediate transfer belt 25 and the front surface of the paper transport belt 29 come into contact with each other. A secondary transfer bias is applied to the secondary transfer roller 31 by a power source (not shown). On the other hand, the lower stretching roller 27 of the transfer unit 24 is grounded. Thereby, a secondary transfer electric field is formed in the secondary transfer nip.

  A registration roller pair 33 is disposed on the right side of the secondary transfer nip in the drawing, and the secondary transfer nip 33 is arranged at a timing at which the transfer paper sandwiched between the rollers can be synchronized with the four-color toner image on the intermediate transfer belt 25. Send to transfer nip. Within the secondary transfer nip, the four-color toner images on the intermediate transfer belt 25 are collectively transferred to the transfer paper due to the influence of the secondary transfer electric field and nip pressure, and become a full-color image combined with the white color of the transfer paper. The transfer paper that has passed through the secondary transfer nip is separated from the intermediate transfer belt 25 and is conveyed to the fixing device 34 along with its endless movement while being held on the front surface of the paper conveyance belt 29.

  The transfer residual toner that has not been transferred to the transfer paper at the secondary transfer nip adheres to the surface of the intermediate transfer belt 25 that has passed through the secondary transfer nip. This transfer residual toner is scraped off and removed by a belt cleaning device in contact with the intermediate transfer belt 25.

  The transfer paper conveyed to the fixing device 34 is fixed to a full color image by pressurization and heating in the fixing device 34, and then sent from the fixing device 34 to the paper discharge roller pair 35, and then to the outside of the apparatus. Discharged.

  In FIG. 1 described above, a switchback device 36 is disposed below the paper transport unit 28 and the fixing device 34. As a result, the transfer paper that has undergone the image fixing process on one side is switched to the transfer paper reversing device side by the switching claw, is reversed there, and enters the secondary transfer transfer nip again. Then, after the secondary transfer process and the fixing process of the image are performed on the other side, the sheet is discharged onto a discharge tray.

  The scanner 150 fixed on the image forming unit 1 includes a fixed reading unit and a moving reading unit 152. The moving reading unit 152 is disposed immediately below a second contact glass (not shown) fixed to the upper wall of the casing of the scanner 150 so as to come into contact with the document MS, and illustrates an optical system including a light source and a reflection mirror. It can be moved in the middle / left / right direction. Then, in the process of moving the optical system from the left side to the right side in the figure, the light emitted from the light source is reflected by a document (not shown) placed on the second contact glass and then passed through a plurality of reflecting mirrors. The light is received by an image reading sensor 153 fixed to the scanner body.

  On the other hand, the fixed reading unit includes a first surface fixed reading unit 151 disposed in the scanner 150 and a second surface fixed reading unit (not shown) disposed in the ADF 51. The first surface fixed reading unit 151 having a light source, a reflection mirror, an image reading sensor such as a CCD, etc. is arranged directly below a first contact glass (not shown) fixed to the upper wall of the casing of the scanner 150 so as to contact the document MS. It is installed. Then, when a document MS conveyed by the ADF 51 described later passes over the first contact glass, the light emitted from the light source is sequentially reflected on the document surface and received by the image reading sensor via a plurality of reflecting mirrors. To do. Thus, the first surface of the document MS is scanned without moving the optical system including the light source and the reflection mirror. The second surface fixed reading unit scans the second surface of the document MS after passing through the first surface fixed reading unit 151.

  The ADF 51 disposed on the scanner 150 includes a document placement table 53 for placing the document MS before reading on the main body cover 52, a transport unit 98 for transporting the document MS, and a document MS after scanning. A document stack base 55 for stacking is held. As shown in FIG. 4, it is supported by a hinge 159 fixed to the scanner 150 so as to be swingable in the vertical direction. Then, by swinging, it moves like an open / close door, and the first contact glass 154 and the second contact glass 155 on the upper surface of the scanner 150 are exposed in the opened state. In the case of a single-bound document such as a book in which one corner of a document bundle is bound, the documents cannot be separated one by one, and therefore cannot be transported by the ADF 51. Therefore, in the case of a single-sided original, the ADF 51 is opened as shown in FIG. close. Then, the image of the page is read by the moving reading unit 152 shown in FIG.

  On the other hand, in the case of a document bundle in which a plurality of independent documents MS are simply stacked, the document MS is automatically conveyed one by one by the ADF 51 while the first surface fixed reading unit 151 in the scanner 150 or the first document in the ADF 51 is used. The two-surface fixed reading unit can sequentially read. In this case, the copy start key 158 is pressed after the document bundle is set on the document placement table 53. Then, the ADF 51 sends the document MS of the document bundle placed on the document placement table 53 sequentially from the top into the conveyance unit 98 and conveys the document MS toward the document stacking table 55 while inverting it. In the course of this conveyance, immediately after the document MS is reversed, the original MS is passed directly over the first surface fixed reading unit 151 of the scanner 150. At this time, the image on the first surface of the document MS is read by the first surface fixed reading unit 151 of the scanner 150.

  FIG. 5 is an enlarged configuration diagram showing the main configuration of the ADF 51 together with the upper portion of the scanner 150. FIG. 6 is a block diagram showing a part of the electric circuit of the ADF 51 and the scanner 150. The ADF 51 includes a document setting unit A, a separation feeding unit B, a registration unit C, a turn unit D, a first reading conveyance unit E, a second reading conveyance unit F, a paper discharge unit G, a stack unit H, and the like.

  As shown in FIG. 6, the ADF 51 has a controller 64 made up of an application specific integrated circuit (ASIC) or the like, and can control various devices and sensors. The controller 64 is connected to a registration sensor 65, a document set sensor 63, a paper discharge sensor 61, an abutment sensor 72, a document width sensor 73, a reading entrance sensor 67, an appropriate paper feed position sensor 59, and the like. A second fixed reading unit 95, a pickup motor 56, a paper feed motor 76, a reading motor 77, a paper discharge motor 78, a bottom plate raising motor 79, and the like are also connected. A main body control unit 200 that controls each device of the scanner 150 is also connected. The scanner 150 has a main body control unit 200 including a CPU (Central Processing Unit), a RAM (Random Access Memory), and the like (not shown), whereby various devices and sensors (not shown) inside the scanner 150 can be controlled. it can. In addition, the I / F 202 is connected to the controller 64 of the ADF (51), and various devices and sensors in the ADF 51 can be indirectly controlled via the controller 64.

  In FIG. 5, the document setting section A has a document table 53 on which a bundle of documents MS is set. The separation feeding unit B separates and feeds the originals MS one by one from the set of originals MS set. The registration unit C temporarily abuts on the fed original MS and aligns the original MS to send it out. Further, the turn portion D has a curved conveyance portion that is curved in a C-shape, and the document MS is turned upside down in the curved conveyance portion so as to be turned upside down. In addition, the first reading and conveying unit E conveys the document MS on the first contact glass 154 and is disposed below the first contact glass 154 and inside the scanner (not shown). 151 causes the first side of the document MS to be read. The second reading / conveying unit F allows the second fixed reading unit 95 to read the second surface of the document MS while conveying the document MS under the second fixed reading unit 95. The paper discharge unit G discharges the original MS from which both-side images are read toward the stack unit H. The stack unit H stacks the document MS on the document stacking table 55.

  The original MS is placed on the movable original table 54 that can swing in the directions of arrows a and b in the drawing according to the thickness of the bundle of originals MS, and the rear end of the original is on the original table 53. It is set in the state where it is put on. At this time, the position in the width direction is adjusted by abutting side guides (not shown) against both ends in the width direction (the direction orthogonal to the drawing surface) on the document placement table 53. The document MS set in this way pushes up the lever member 62 that is swingably disposed above the movable document table 54. Accordingly, the document set sensor 63 detects the setting of the document MS and transmits a detection signal to the controller 64. This detection signal is sent from the controller 64 to the main body control unit 200 via the I / F 202.

  The document placing table 53 holds a first length sensor 57 and a second length sensor 58 which are made of a reflection type photosensor or an actuator type sensor for detecting the length of the document MS in the conveyance direction. These length sensors detect the length of the document MS in the conveyance direction.

  Above the bundle of documents MS placed on the movable document table 54, a pickup roller 80 supported by a cam mechanism so as to be movable in the vertical direction (arrow c and d directions in the figure) is disposed. . The cam mechanism can be moved up and down by being driven by a pickup motor 56. When the pickup roller 80 moves upward, the movable document table 54 swings in the direction of arrow a in the drawing, and the pickup roller 80 contacts the uppermost document MS in the bundle of documents MS. When the movable document table 54 further rises, the proper feed position sensor 59 eventually detects a rise to the upper limit of the movable document table 54. As a result, the pickup motor 56 is stopped, and the raising of the movable document table 54 is stopped.

  For the main body operation unit 201 including a numeric keypad and a display provided on the main body of the copying machine, key operations for setting a reading mode indicating the duplex scanning mode or the single-sided scanning mode by the operator, and copying start An operation of pressing the key 158 is performed. When the copy start key 158 is pressed, a document feed signal is transmitted from the main body control unit 200 to the controller 64 of the ADF 51 via the I / F 202. Then, the pickup roller 80 is rotationally driven by the normal rotation of the paper feed motor 76 to send out the document MS on the movable document table 54 from the movable document table 54.

  When setting the double-sided reading mode or the single-sided reading mode, it is possible to collectively set the double-sided or single-sided setting for all the originals MS placed on the movable original table 54. Also, the first and tenth originals MS are set to the double-sided reading mode, while the other originals MS are set to the single-sided reading mode. Can also be set.

  The document MS sent out by the pickup roller 80 enters the separation conveyance unit B and is sent to a contact position with the paper feed belt 84. The paper feed belt 84 is stretched around a drive roller 82 and a driven roller 83, and is endlessly moved in the clockwise direction in the drawing by the rotation of the drive roller 82 accompanying the forward rotation of the paper feed motor 76. A reverse roller 85 that is driven to rotate in the clockwise direction in the drawing by the forward rotation of the paper feed motor 76 is in contact with the lower tension surface of the paper feed belt 84. At the contact portion, the surface of the paper feed belt 84 moves in the paper feed direction. On the other hand, the reverse roller 85 is in contact with the paper feed belt 84 with a predetermined pressure, and when the paper is in direct contact with the paper feed belt 84 or only one document MS is sandwiched between the contact portions. At that time, it is carried around to the belt or the document MS. However, when a plurality of documents MS are sandwiched between the contact portions, the accompanying force is lower than the torque of the torque limiter, so that the document is rotated clockwise in the figure opposite to the accompanying direction. As a result, a moving force in the direction opposite to the paper feed is applied to the original document MS below the uppermost position by the reverse roller 85, and only the uppermost original document MS is separated from several originals.

  The original MS separated into one sheet by the action of the paper feed belt 84 and the reverse roller 85 enters the registration portion C. Then, the tip is detected when passing just below the butting sensor 72. At this time, the pickup roller 80 receiving the driving force of the pickup motor 56 is still driven to rotate. However, the original MS is separated from the original MS by the lowering of the movable original table 54. Only conveyed by. Then, the endless movement of the paper feed belt 84 continues for a predetermined time from the timing when the leading edge of the document MS is detected by the abutting sensor 72, and the leading edge of the document MS is rotationally driven while being in contact with the pull-out driving roller 86. It abuts against the contact portion with the pull-out driven roller 87. With the leading edge of the document MS abutting against the abutting portions of both rollers, the trailing edge of the document MS is fed in the paper feeding direction, so that the document MS is bent by a predetermined amount while the leading edge is bent. Positioned at the contact portion. As a result, the skew (inclination) of the document MS is corrected, and the document MS assumes a posture along the paper feeding direction.

  In addition to correcting the skew of the document MS, the pull-out driven roller 87 plays a role of transporting the document MS whose skew has been corrected to the intermediate roller pair 66 on the downstream side in the document transport direction. It is rotationally driven by reverse rotation. When the paper feed motor 76 rotates in the reverse direction, the pull-out driven roller 87 and one of the rollers in the intermediate roller pair 66 in contact with each other start to rotate, and the endless movement of the paper feed belt 84 stops. At this time, the rotation of the pickup roller 80 is also stopped.

  The document MS sent from the pull-out driven roller 87 passes directly below the document width sensor 73. The document width sensor 73 has a plurality of paper detection units composed of reflective photosensors and the like, and these paper detection units are arranged in the document width direction (a direction perpendicular to the drawing sheet). Based on which paper detection unit detects the document MS, the size of the document MS in the width direction is detected. The length of the document MS in the conveyance direction is detected based on the timing from when the leading edge of the document MS is detected by the abutting sensor 72 until the trailing edge of the document MS is not detected by the abutting sensor 72. .

  The leading edge of the document MS whose size in the width direction is detected by the document width sensor 73 enters the turn portion D and is sandwiched between the abutting portions between the rollers of the intermediate roller pair 66. The conveyance speed of the original MS by the intermediate roller pair 66 is set to be higher than the conveyance speed of the original MS in the first reading conveyance section E described later. This shortens the time until the document MS is sent to the first reading conveyance unit E.

  The leading edge of the document MS conveyed in the turn part D passes through the position where the document leading edge faces the reading entrance sensor 67. As a result, when the leading edge of the document MS is detected by the reading inlet sensor 67, the leading edge of the original MS is conveyed to the position of the pair of reading inlet rollers (a pair of 89 and 90) on the downstream side in the conveying direction. The document conveyance speed by the roller pair 66 is reduced. As the reading motor 77 starts to rotate, one roller in the reading inlet roller pair (89, 90), one roller in the reading outlet roller pair 92, and one roller in the second reading outlet roller pair 92 are moved. Each starts to rotate.

  In the turn section D, the upper and lower surfaces are reversed and the conveyance direction is folded while the document MS is conveyed on the curved conveyance path between the intermediate roller pair 66 and the reading entrance roller pair (89, 90). . The leading edge of the document MS that has passed through the nip between the rollers of the reading entrance roller pair (89, 90) passes directly under the registration sensor 65. When the leading edge of the document MS is detected by the registration sensor 65 at this time, the document transport speed is reduced while applying a predetermined transport distance, and the transport of the document MS is temporarily stopped before the first reading transport unit E. . Further, a registration stop signal is transmitted to the main body control unit 200 via the I / F 202.

  When the main body control unit 200 receiving the registration stop signal transmits a reading start signal, the rotation of the reading motor 77 is resumed until the leading edge of the document MS reaches the first reading conveyance unit E under the control of the controller 64. The conveyance speed of the document MS is increased to a predetermined conveyance speed. Then, at the timing when the leading edge of the document MS calculated based on the pulse count of the reading motor 77 reaches the reading position by the first surface fixed reading unit 151, the controller 64 sends the first document MS to the main body control unit 200. A gate signal indicating an effective image area in the sub-scanning direction of the surface is transmitted. This transmission is continued until the trailing edge of the document MS leaves the reading position by the first surface fixed reading unit 151, and the first surface of the document MS is read by the first surface fixed reading unit 151.

  The document MS that has passed through the first reading conveyance section E passes through a pair of reading exit rollers 92 described later, and then the leading edge of the document MS is detected by the paper discharge sensor 61. When the single-sided reading mode is set, reading of the second side of the document MS by the second fixed reading unit 95 described later is not necessary. Accordingly, when the leading edge of the document MS is detected by the paper discharge sensor 61, the forward drive of the paper discharge motor 78 is started, and the lower paper discharge roller in the drawing roller pair 94 in the clockwise direction in the figure. Is driven to rotate. Further, the timing at which the trailing edge of the document MS exits the nip of the discharge roller pair 94 is calculated based on the discharge motor pulse count after the leading edge of the document MS is detected by the discharge sensor 61. Based on this calculation result, the driving speed of the paper discharge motor 78 is decelerated immediately before the trailing edge of the original MS comes out of the nip of the discharge roller pair 94, and the original MS is removed from the original stack base 55. Paper is discharged at a speed that does not pop out.

  On the other hand, when the double-sided reading mode is set, the timing from when the leading edge of the document MS is detected by the paper discharge sensor 61 until reaching the second fixed reading unit 95 is based on the pulse count of the reading motor 77. Is calculated. At that timing, a gate signal indicating an effective image area in the sub-scanning direction on the second surface of the document MS is transmitted from the controller 64 to the main body control unit 200. This transmission is continued until the trailing edge of the document MS exits the reading position by the second fixed reading unit 95, and the second surface of the document MS is read by the second fixed reading unit 95.

  The second fixed reading unit 95 as a reading unit includes a contact image sensor (CIS), and for the purpose of preventing a reading vertical streak caused by a paste-like foreign material adhering to the document MS adhering to the reading surface. The reading surface is coated. A second reading roller 96 as a document supporting unit that supports the document MS from the non-reading surface side (first surface side) is disposed at a position facing the second fixed reading unit 95. The second reading roller 96 serves to prevent the document MS from floating at the reading position by the second fixed reading unit 95 and to function as a reference white portion for acquiring shading data in the second fixed reading unit 95. I'm in charge. In this copying machine, the second reading roller 96 is used as the document supporting means for supporting the document at a position facing the second fixed reading unit 95, but a guide plate-shaped one may be used.

  FIG. 7 is a block diagram showing the main part of the electric circuit of the second fixed reading unit 95. As shown in the figure, the second fixed reading unit 95 has a light source unit 95a composed of an LED array, a fluorescent lamp, a cold cathode tube, or the like. Also, a plurality of sensor chips 95b arranged in the main scanning direction (direction corresponding to the document width direction), a plurality of OP amplifier circuits 95c individually connected to each sensor chip 95b, and individually connected to each OP amplifier circuit 95c. A plurality of A / D converters 95e are also provided. Further, it also includes an image processing unit 95f, a frame memory 95g, an output control circuit 95h, an I / F circuit 95i, and the like.

  The sensor chip 95b includes a photoelectric conversion element called a 1 × contact image sensor and a condenser lens. Before a document (not shown) enters the reading position by the second fixed reading unit 95, a lighting ON signal is sent from the controller 64 to the light source unit 95a. As a result, the light source unit 95a is turned on and irradiates the light toward the second surface of the document (not shown). The reflected light reflected from the second surface of the document is condensed on the photoelectric conversion element by the condensing lens and read as image information in the plurality of sensor chips 95b. Image information read by each sensor chip 95b is amplified by an OP amplifier circuit 95c and then converted to digital image information by an A / D converter 95e. The digital image information is input to the image processing unit 95f, subjected to shading correction, and then temporarily stored in the frame memory 95g. Thereafter, the data is converted into a data format that can be received by the main body control unit 200 by the output control circuit 95h, and then output to the main body control unit 200 via the I / F circuit 95i. Note that a timing signal, a light source lighting signal, a power source for notifying the timing at which the leading edge of the document reaches the reading position by the second fixed reading unit 95 (image data after that timing is treated as valid data) is sent from the controller 64. Etc. are output.

Next, a characteristic configuration of the copying machine will be described.
FIG. 8 is an enlarged configuration diagram showing the periphery of the first surface fixed reading unit 151.
As shown in FIG. 8, a cleaning member 301 made of a flexible material is provided below an upstream guide portion 158 provided upstream of the first contact glass 154 in the document conveyance direction. The cleaning member 301 is provided so as to be capable of reciprocating in the X direction in the drawing. The first contact glass 154 is provided so as to be capable of reciprocating in the Y direction in the drawing. A scooping guide member 156 for scooping up the transported document is provided on the downstream side of the first contact glass 154 in the document transport direction. The scooping guide member 156 is provided so as to be swingable in the Z direction in the figure with the fulcrum A as the center. An intermediate guide member 305 for guiding the document from the first contact glass 154 to the scooping guide member 156 is fixed to the downstream end of the first contact glass 154 in the document conveyance direction.

FIG. 9 is an exploded perspective view of the periphery of the first surface fixed reading unit 151.
As shown in FIG. 9, the first contact glass 154 is fixed so as to cover a rectangular window frame provided on the plate-like fixing member 171. In addition, elongated holes 171b extending in the sub scanning direction are formed in the vicinity of both ends of the fixing member 171 in the main scanning direction.

  Two positioning pins 150 a and 150 b are provided at both ends of the casing of the scanner 150 in the main scanning direction, and these positioning pins 150 a and 150 b are inserted into the elongated holes 171 b of the fixing member 171. Thus, the first contact glass 154 is supported so as to be slidable within a predetermined range in the sub-scanning direction with respect to the casing of the scanner 150. The fixing member 171 is covered with a lid member 157 that covers the periphery of the first surface fixed reading unit 151 on the upper surface of the scanner 150. The lid member 157 is formed with a rectangular passage hole 157c for allowing the light emitted from the first surface fixed reading unit 151 and the reflected light reflected from the document image surface to pass therethrough, and conveys the document more than the passage hole 157c. An upstream guide portion 158 is provided on the upstream side in the direction. Further, guide fixing plates 157d are provided at both ends in the main scanning direction downstream of the passage hole 157c in the document conveying direction. The scooping guide member 156 is swingably supported by the guide fixing plate 157d. Positioning holes 157a and 157b into which the tips of the positioning pins 150a and 150b are fitted are formed near both ends in the main scanning direction of the lid member 157. The front ends of the positioning pins 150a and 150b are fitted and fixed in the positioning holes 157a and 157b of the lid member 157, whereby the first contact glass 154 is fixed to the scanner 150 so as to be slidable within a predetermined range.

The casing of the scanner 150 is provided with a glass moving mechanism 180 as contact glass moving means for reciprocating the first contact glass 154.
FIG. 10 is a perspective view of the glass moving mechanism 180.
The glass moving mechanism 180 includes a rotating cam 174, a cam drive motor 173, a timing belt 176, and the like. The rotating cam 174 is rotatably supported by a support base 150 c provided on the casing of the scanner 150. The support base 150c is provided with a through hole (not shown). The cam drive motor 173 is connected to the scanner so that the motor shaft 173a of the cam drive motor 173 passes through the through hole from below to above. It is fixed to 150 casings. A timing belt 176 is stretched between the motor shaft 173a and the rotating cam 174. A stepping motor was used as the cam drive motor 173.

  The rotation cam 174 is provided with a drive transmission pin 174a. As shown in FIG. 9, the drive transmission pin 174a is provided at a substantially central portion of the fixing member 171 in the main scanning direction, and is inserted into an elongated hole 172 extending in the main scanning direction. Further, the rotating cam 174 has a notch 174b. A home position sensor 175 is fixed to the support base 150c. The home position sensor 175 is a transmissive sensor, and the light emitting unit 175a and the light receiving unit 175b face each other with the rotating cam 174 interposed therebetween. The home position sensor 175 is configured such that when the notch 174b of the rotating cam 174 comes to a position where the light emitting unit 175a and the light receiving unit 175b of the home position sensor 175 face each other and the light receiving unit 175b receives the light from the light emitting unit 175a. It detects that 1 contact glass 154 exists in a home position. In the present embodiment, the notch 174 is configured to face the home position sensor 175 when the first contact glass 154 is located in the uppermost stream in the document transport direction in the first contact glass movable range. That is, in the first contact glass movable range, the most upstream position in the document transport direction is the home position of the first contact glass 154. In addition, the said glass moving mechanism 180 is an example, For example, you may comprise the glass moving mechanism 180 with a rack & pinion.

FIG. 11 is a perspective view showing the first contact glass 154, the intermediate guide member 305, and the scooping guide member 156, and FIG. 12 is an enlarged view of a part of FIG.
As shown in the figure, the intermediate guide member 305 is formed of a plate-like member, and a plurality of grooves 305b are provided on the scooping guide member 156 side of the intermediate guide member 305. A plurality of claw portions 156d are provided on the end portion of the scooping guide member 156 on the first contact glass side. These claw portions 156d are provided corresponding to the grooves 305b of the intermediate guide member 305. A guide cleaning member 303 is provided on the lower surface of the claw portion 156d of the scooping guide member 156 and the lower surface of the first contact glass side end portion of the guide surface 156b. The guide cleaning member 303 provided on the lower surface of the claw portion 156d slides with the groove portion 305b of the intermediate guide member 305, and removes dust attached to the groove portion 305b. A guide cleaning member 303 provided on the lower surface of the first contact glass side end portion of the guide surface 156b slides on the document guide surface 305a of the intermediate guide member to remove dust adhering to the document guide surface 305a. Further, a through-hole 156f that penetrates the scooping guide member 156 in the main scanning direction is provided near the top of the side surface of the scooping guide member 156. A through hole is also provided in the guide fixing plate 157d provided in the lid member 157 shown in FIG. 9, and is not shown in the through hole of the guide fixing plate 157d and the through hole 156f of the scooping guide member 156. By penetrating the support shaft, the scooping guide member 156 is swingably supported by the guide fixing plate 157d of the lid member 157. In addition, guide pins 156e are provided on the first contact glass side of both side surfaces of the scooping guide member 156, respectively.

As the scooping guide member 156 swings, the guide cleaning member 303 comes in contact with and separates from the intermediate guide member 305 as shown in FIG.
As shown in FIG. 13, the tip of the claw portion 156d is located farther from the document conveyance path than the document guide surface 305a of the intermediate guide member 305. The claw portion 156d is inclined so that the downstream side in the document conveyance direction is closer to the document conveyance path than the document guide surface 305a of the intermediate guide member 305. The height of the guide surface 305a of the intermediate guide member 305 is the same as the document conveyance surface of the first contact glass 154, or slightly separated from the document conveyance path than the document conveyance surface.

  The leading edge of the document that has passed the reading position moves while being guided by the document guide surface 305 a of the intermediate guide member 305. Then, the leading edge of the document comes into contact with a portion having the same height as the document guide surface 305a of the intermediate guide member 305 on the downstream side in the document conveyance direction of the claw portion 156d, and is crawled upward by the claw portion 156d. The leading edge of the document that is scooped up is guided by the guide surface 156b of the scooping guide member 156 and moves. As a result, the leading edge of the document can be smoothly moved without hitting the edge of the guide member 156 facing the first contact glass. Since the document guide surface 305a of the intermediate guide member 305 is parallel to the document conveyance surface of the first contact glass 154, the document MS does not float from the document conveyance surface of the first contact glass 154 at the reading position. Therefore, it is possible to suppress deterioration of the read image.

Next, the cleaning member contacting / separating mechanism 190 serving as a cleaning member contacting / separating unit that moves the cleaning member 301 up and down will be described.
14 is a top view of the vicinity of the front side of the first surface fixed reading unit 151, and FIG. 15 is an exploded perspective view of the cleaning member contacting / separating mechanism 190.
As shown in FIG. 15, a guide pin 301b is provided at a substantially central portion of the front side surface of the cleaning member. Two driven pins 301a are provided at a certain distance from the guide pins 301b. The driven pin 301a is shorter than the guide pin 301b. The guide pin 301b is provided in the central portion of the cleaning member support plate 307 and passes through the guide hole 307b extending in the vertical direction. The two driven pins 301a are spaced apart from the guide hole 307b of the cleaning member support plate 307 by a certain distance. It is opened and inserted into a driven hole 307a extending in the vertical direction. As shown in FIG. 8, the cleaning member support plate 307 is fixed to the front lower surface of the upstream guide portion 158. Although not shown, the back side surface of the cleaning member is similarly provided with a guide pin and two driven pins, and these pins are fixed to the bottom surface of the upstream guide portion 158 on the cleaning member support plate. Is inserted into each hole. Thereby, the cleaning member 301 is supported by the lid member 157 so as to be movable up and down.

As shown in FIG. 14, cleaning member guides 308 are provided at both ends of the first contact glass 154 in the main scanning direction. A guide groove 308 a as shown by a dotted line in FIG. 15 is formed on the surface of the cleaning member guide 308 facing the cleaning member. The guide groove 308a has a first groove portion M1 extending in the document conveyance direction, and a second groove portion M2 extending obliquely upward from the upstream end of the first groove portion M1 in the document conveyance direction toward the downstream side in the document conveyance direction. Further, the third groove M3 extending in parallel to the first groove M1 from the downstream end of the second groove M2 in the document conveyance direction, the downstream end of the third groove M3 in the document conveyance direction, and the downstream end of the first groove M1 in the document conveyance direction. And a fourth groove M4 extending in the vertical direction. A guide switching claw 309 is rotatably provided between the first groove part M1 and the second groove part M2. At the normal time, the tip of the guide switching claw 309 is in contact with the lower surface of the first groove M1 by its own weight. And the front-end | tip of the guide pin 301b of the cleaning member 301 is engaging with this guide groove 308a.
A distance L1 from the most downstream end in the document conveyance direction to the most upstream end in the document conveyance direction of the guide groove 308a is the same length as the movable range of the first contact glass 154. Further, the third groove M3 may be eliminated, and the guide groove 308a may be shaped like a right triangle.

Next, a guide cleaning member contacting / separating mechanism 210 that is a guide cleaning member contacting / separating means for moving the guide cleaning member 303 up and down will be described.
FIG. 16 is an exploded perspective view of the guide cleaning member contact / separation mechanism 210.
As shown in FIG. 14, the guide cleaning member guides 310 are provided at both ends of the intermediate guide member 305 in the main scanning direction. A guide groove 310a as shown by a dotted line in FIG. 16 is formed on the surface of the guide cleaning member guide 310 facing the scooping guide member 156. The guide groove 310 a of the guide cleaning member guide 310 has a shape that is line-symmetric with respect to the guide groove 308 a of the cleaning member guide 308. That is, it has a first groove portion N1 extending in the document conveyance direction and a second groove portion N2 extending obliquely upward from the downstream end of the first groove portion N1 in the document conveyance direction toward the upstream side in the document conveyance direction. Further, the third groove N3 extending in parallel to the first groove N1 from the upstream end of the second groove N2 in the document conveyance direction, the upstream end of the third groove N3 in the document conveyance direction, and the upstream end of the first groove N1 in the document conveyance direction. And a fourth groove portion N4 extending in the vertical direction. A guide switching claw 311 is rotatably provided between the first groove portion N1 and the second groove portion N2. At the normal time, the tip of the guide switching claw 309 is in contact with the lower surface of the first groove N1 by its own weight. The tip of the guide pin 156e of the scooping guide member is engaged with the guide groove 310a. Further, the third groove portion N3 may be eliminated, and the guide groove 310a may be shaped like a right triangle. The distance L2 from the most downstream end of the guide groove 310a in the document transport direction to the most upstream end in the document transport direction is the same length as the movable range of the first contact glass 154.

Next, the contact / separation operation of the cleaning member 301 and the contact / separation operation of the guide cleaning member 303 will be described with reference to FIG.
As shown to a of FIG. 17, when the 1st contact glass 154 exists in a home position, the guide pin 301b of the cleaning member 301 is located in the 4th groove part M4 in the guide groove 308a of the cleaning member guide 308. FIG. On the other hand, the guide pin 156e of the scooping guide member 156 is positioned at the downstream end in the document conveying direction of the second groove portion N2 in the guide groove 310a of the guide cleaning member guide 310. At this time, the cleaning member 301 is in contact with the downstream end of the original contact surface of the first contact glass 154 in the original conveyance direction, and the guide cleaning member 303 is in contact with the downstream end of the intermediate guide member 305 in the original conveyance direction. .

  Immediately before the document MS is transported to the first reading transport unit E, the cam drive motor 173 is driven, and the first contact glass 154 transports the document as shown in FIG. Move in the same direction as the direction. The moving speed of the first contact glass 154 at this time depends on the length of the document in the sub-scanning direction detected by the first and second length sensors 57 and 58 and the reading conditions (magnification, color / monochrome, reading image quality). It is determined. The moving speed is determined based on the length of the original in the sub-scanning direction and the reading conditions (magnification, color / black and white, read image quality), when the first contact glass 154 is movable. It is set so as to reach the most downstream in the document transport direction of the range. If the size of the document to be transported is an irregular size, set the moving speed corresponding to the standard size whose length is longer than the size of the document to be transported among the closest standard sizes, or the document to be transported It is possible to select whether to set a moving speed corresponding to a standard size whose length is longer than the size.

  As shown in FIG. 17 b, when the first contact glass 154 moves in the same direction as the document conveyance direction, the cleaning member guide 308 moves integrally with the first contact glass 154 in the same direction as the document conveyance direction. When the cleaning member guide 308 moves in the same direction as the document conveyance direction, the guide pin 301b of the cleaning member 301 is in a direction opposite to the document conveyance direction relative to the first groove M1 in the guide groove 308a of the cleaning member guide 308. Move to. Then, the cleaning member 301 slides on the original conveying surface of the first contact glass 154 to remove the deposits on the original conveying surface.

  On the other hand, when the first contact glass 154 moves in the same direction as the document conveyance direction, the intermediate guide member 305 moves in the same direction as the document conveyance direction integrally with the first contact glass 154 and is fixed to the intermediate guide member 305. The guide cleaning member guide 310 also moves in the same direction as the document conveyance direction. When the guide cleaning member guide 310 moves in the same direction as the document conveyance direction, the guide pin 156e of the scooping guide member 156 contacts the guide switching claw 311. The tip of the guide switching claw 311 is in contact with the lower surface of the first groove N1, and cannot rotate counterclockwise in the figure. As a result, the guide pin 156e of the scooping guide member 156 that is in contact with the guide switching claw 311 is guided by the guide switching claw 311 and moves upward. As a result, the scooping guide member 156 rotates clockwise in the drawing with A in the drawing as a fulcrum, and the guide cleaning member 303 is separated from the intermediate guide member 305.

  When the first contact glass 154 further moves in the same direction as the document conveyance direction, the guide pin 156e of the scooping guide member 156 is moved by the second groove N2 of the guide cleaning member guide 310 as shown in FIG. While moving upward, it is guided to the third groove N3.

  Further, when the first contact glass 154 moves in the same direction as the document conveyance direction, the guide pin 301 b of the cleaning member 301 comes into contact with the guide switching claw 309. Further, when the first contact glass 154 moves in the same direction as the document conveying direction, the guide switching claw 309 is pushed by the guide pin 301b of the cleaning member 301 and rotates clockwise in FIG. As shown, the guide pin 301b of the cleaning member 301 is guided to the second groove M2. Then, as shown in FIG. 17e, when the first contact glass 154 comes to the most downstream side in the document conveying direction of the first contact glass movable range, the guide pin 301b of the cleaning member 301 is separated from the guide switching claw 309, The guide switching claw 309 rotates counterclockwise in the figure by its own weight, and the tip of the guide switching claw 309 comes into contact with the lower surface of the first groove portion M1. At this time, the guide pin 301b of the cleaning member 301 relatively moves to the upstream end of the second groove M2 in the document conveyance direction. Further, at this time, the cleaning member 301 moves relatively to the upstream end of the first contact glass 154 in the document conveyance direction, and the adhered matter on the first contact glass document conveyance surface removed by the cleaning member 301 is removed from the document conveyance surface. It falls to the first dust collecting member 313. Thereby, the deposits on the document conveying surface of the first contact glass can be completely removed.

  On the other hand, the guide pin 156e of the scooping guide member 156 relatively moves to the upstream end of the third groove N3 in the document transport direction. When the third groove portion N3 moves to the upstream end in the document conveying direction, the guide pin 156e of the scooping guide member 156 falls and moves to the lower end of the fourth groove portion N4. When the guide pin 156e of the scooping guide member 156 falls, the scooping guide member 156 rotates counterclockwise around the fulcrum A in the figure, and the guide cleaning member 303 contacts the intermediate guide member 305. .

  When the trailing edge of the document passes through the reading position, the first contact glass 154 moves in the direction opposite to the document conveying direction as shown in FIG. When the first contact glass 154 moves in the direction opposite to the document conveying direction as shown in FIG. 17f, the guide pin 156e of the scooping guide member 156 guides the first groove N1 toward the upstream end in the document conveying direction. It moves relative to the cleaning member guide 310. At this time, the guide cleaning member 303 slides with the groove portion and the guide surface of the intermediate guide member, and removes the deposits attached to the surface of the intermediate guide member.

  On the other hand, when the first contact glass 154 moves in the direction opposite to the document conveying direction, the guide pin 301b of the cleaning member 301 contacts the guide switching claw 309. The tip of the guide switching claw 309 is in contact with the lower surface of the first groove M1, and cannot rotate counterclockwise in the figure. As a result, the guide pin 301b of the cleaning member 301 in contact with the guide switching claw 309 is guided by the guide switching claw 309 and moves upward. As a result, the cleaning member 301 moves upward, and the cleaning member 301 is separated from the document conveying surface of the first contact glass 154.

  When the first contact glass 154 further moves in the direction opposite to the document conveying direction, the guide pin 301b of the cleaning member 301 moves upward by the second groove portion M2 of the cleaning member guide 308, as shown in FIG. While being guided to the third groove M3.

  Further, when the first contact glass 154 moves in the direction opposite to the document conveying direction, the guide pin 156e of the scooping guide member 156 contacts the guide switching claw 311. Further, when the first contact glass 154 moves in the direction opposite to the document conveying direction, the guide switching claw 311 is pushed by the guide pin 156e and rotates counterclockwise in the figure, as shown in h of FIG. Then, the guide pin 156e is guided to the second groove portion N2. When the tip of the guide switching claw 311 and the guide pin are separated from each other, the guide switching claw rotates in the clockwise direction in the drawing by its own weight, and the tip of the guide switching claw 311 comes into contact with the lower surface of the first groove portion N1.

  On the other hand, the guide pin 301b of the cleaning member 301 relatively moves to the upstream end of the third groove portion M3 in the document conveyance direction.

  And as shown to a of FIG. 17, when the 1st contact glass 154 returns to a home position, the guide pin 301b of the cleaning member 301 will fall, and it will move to the lower end of the 4th groove part M4, and the cleaning member 301 will move. Then, it moves downward and comes into contact with the original conveying surface of the first contact glass 154. On the other hand, the guide pin 156e of the scooping guide member 156 moves to the downstream end of the second groove N2. At this time, the guide cleaning member 303 is located at the upstream end of the intermediate guide member, and the deposits removed by the guide cleaning member 303 fall from the upstream end of the intermediate guide member to the second dust collection member 314.

  Thus, in this embodiment, the contact / separation operation of the cleaning member and the contact / separation operation of the guide cleaning member are performed in conjunction with the reciprocation of the first contact glass. Thereby, the reciprocating movement of the first contact glass, the contact / separation operation of the cleaning member, and the contact / separation operation of the guide cleaning member can be performed by one drive source. As a result, the number of parts can be reduced and the apparatus can be made inexpensive compared to the case where the contact / separation operation of the cleaning member, the contact / separation operation of the guide member, and the movement operation of the first contact glass are performed by separate drive sources. Can be. Moreover, space saving can be achieved.

  In the present embodiment, the cleaning member 301 contacts the first contact glass 154 when the first contact glass 154 moves forward, and cleans the document conveyance surface of the first contact glass 154. Then, the cleaning member 301 is separated from the first contact glass 154 when the first contact glass 154 moves in the return path. Accordingly, only when the first contact glass document conveyance surface is cleaned by the cleaning member 301, the cleaning member 301 rubs against the first contact glass document conveyance surface, so that the cleaning member 301 always contacts the first contact glass document conveyance surface. Compared with what contacts, the lifetime of the cleaning member 301 can be extended, and damage to the first contact glass 154 can be suppressed.

  In the present embodiment, the guide cleaning member 303 is separated from the intermediate guide member 305 when the first contact glass 154 moves in the forward path, and abuts against the intermediate guide member when the first contact glass moves in the backward path. Clean the member surface. Therefore, only when the intermediate guide member 305 is cleaned with the guide cleaning member 303, the guide cleaning member 303 slidably rubs against the intermediate guide member. The life of the cleaning member 303 can be extended.

  In the present embodiment, the first contact glass 154 is brought into contact with the document conveyance surface of the first contact glass 154 during the forward movement in which the first contact glass 154 moves away from the cleaning member 301. I am trying to clean it. Thereby, the deposits on the first contact glass removed by the cleaning member can be scraped off from the upstream end of the first contact glass. As a result, the adhering matter on the first contact glass removed by the cleaning member is removed when the first contact glass 154 is cleaned on the first contact glass during the backward movement in which the first contact glass 154 moves toward the cleaning member 301. It does not remain on the intermediate guide member. Therefore, it is possible to suppress the deposits remaining on the intermediate guide member from adhering to the first contact glass again due to vibration or the like. Similarly, the guide cleaning member 303 also performs cleaning by bringing it into contact with the intermediate guide member when the first contact glass 154 moves backward in a direction away from the guide cleaning member 303. Thereby, the deposits on the intermediate guide member removed by the guide cleaning member 303 can be removed from the intermediate guide member 305 without being moved to the first contact glass side.

  In the present embodiment, the cleaning member 301 is rubbed to the upstream end of the first contact glass 154 in the document conveyance direction, so that the dust on the first contact glass 154 collected by the cleaning member 301 is removed from the first contact glass. It can be removed from above. Further, since the cleaning member 301 is rubbed from the downstream end to the upstream end of the first contact glass 154, most of the dust adhering to the first contact glass 154 can be removed from the contact glass.

  In this embodiment, the cleaning member 301 is rubbed to the upstream end of the first contact glass 154 in the document conveying direction, but the cleaning member 301 is rubbed only to the near side of the upstream end of the first contact glass 154. Even if the configuration is such that the first contact glass 154 moves in the outward direction in which the first contact glass 154 moves away from the cleaning member 301, it is preferable that the cleaning member 301 is brought into contact with the document conveying surface of the first contact glass 154. . This is because the cleaning member 301 comes into contact with the first contact glass 154 when it moves forward, so that the dust adhering to the first contact glass 154 is collected by the cleaning member 301 on the side farther from the reading position than the cleaning member 301. It is done. Since the document conveyance path is closer to the reading position than the cleaning member 301, even if the dust collected by the cleaning member 301 is on the first contact glass 154, the collected dust does not collide with the transported document. . Therefore, the collected dust is not dispersed by the transported document, and does not adhere again to a portion that passes through the reading position when the first contact glass 154 reads the image. Therefore, even if the dust collected by the cleaning member 301 is in the first contact glass 154, it is possible to suppress the occurrence of vertical stripes.

  In the present embodiment, the image is read at the reading position while the document is transported and the first contact glass 154 is moved in the same direction as the document transport direction by the glass moving mechanism 180. As a result, the original image is read at a different position on the first contact glass 154 at all times, and even if there is an adhering matter such as dust or dirt on the first contact glass, the image quality is deteriorated due to vertical stripes. Can be suppressed. In the present embodiment, the first contact glass 154 is moved in the same direction as the document conveying direction during document reading, but may be moved in the opposite direction.

  There is a case where the user inadvertently opens the ADF 51 during the reading operation, or the user opens the ADF 51 when the first contact glass 154 is returned to the home position. When the user inadvertently opens the ADF 51 during the reading operation, if the movement of the first contact glass 154 is stopped, the first contact glass 154 stops at the positions b to d in FIG. Further, when the user opens the ADF 51 during the operation of returning the first contact glass 154 to the home position, if the movement of the first contact glass 154 is stopped, the first contact glass 154 is moved to positions f to h in FIG. Will stop at. When the first contact glass 154 stops at positions b to d in FIG. 17 when the ADF 51 is opened, a gap is formed between the intermediate guide member 305 and the guide cleaning member 303. At this time, a foreign object such as a clip may enter a gap between the intermediate guide member 305 and the guide cleaning member 303 due to a user's mistake. Further, when the user notices dirt on the first contact glass 154 and the intermediate guide member 305 and blows around the first contact glass, the blown breath causes a gap between the intermediate guide member 305 and the guide cleaning member 303. There is a risk that the dust collecting member 314 will be blown through and dust inside the dust collecting member will rise and adhere to the first contact glass 154 and the intermediate guide member 305 again. When the ADF 51 is opened, if the first contact glass 154 is stopped at the positions f to h in FIG. 17, a gap is formed between the cleaning member 301 and the first contact glass 154. As a result, similar to the above, foreign matter may enter the gap, or dust on the dust collection member 313 may rise and adhere to the first contact glass 154 or the intermediate guide member 305 again. Therefore, when the ADF 51 is opened, the cleaning member 301 and the guide cleaning member 303 are preferably positioned at the positions a and e in FIG. In particular, it is preferable to return to the position (home position) in FIG. This is because when the first contact glass 154 returns to the home position, the first contact glass 154 is positioned below the upstream guide portion 158. Therefore, when the ADF 51 is opened, the first contact glass 154 is covered with the upstream guide portion 158 and is not exposed, so that it is possible to prevent the user from touching the first contact glass 154 and damaging the first contact glass 154. Because it can.

  Here, for example, if the first contact glass 154 is located at b in FIG. 17 when the ADF 51 is opened, the route b → a and b → c → d → e are the routes to return to the home position. There is a route of → f → g → h → a. In the route of b → a, the first contact glass 154 can be returned to the home position in a short time, but dust remains on the first contact glass 154 and the intermediate guide member 305. On the other hand, if the route b → c → d → e → f → g → h → a is taken, dust on the first contact glass 154 and the intermediate guide member 305 can be removed, but it takes time to return to the home position. End up. As a result, the first contact glass 154 may be moved even after the ADF 51 is opened. As a result, when a user places an object on the moving first contact glass 154, the object is sandwiched between the first contact glass 154 and the upstream guide portion 158, and the object is damaged, There is a possibility that the surface of the first contact glass 154 may be damaged.

  Therefore, in the present embodiment, when the ADF 51 is opened during the movement of the first contact glass, the return position of the first contact glass is determined based on the opening speed of the ADF 51 and the position of the first contact glass. This will be specifically described below.

First, detection of the opening speed of the ADF 51 and the opening of the ADF 51 will be described.
18 is an enlarged perspective view around the hinge 159, and FIG. 19 is a view seen from the direction B in FIG.
As shown in the figure, the hinge 159 has a frame portion 159a that supports the ADF 51, and a fixing portion 159b that is fixed to the upper surface of the scanner 150, and the frame portion 159a is rotatably fixed to the fixing portion 159b. Has been. A filler member 323 is attached to the fixed portion 159b. A sensor fixing plate 159c is attached to the frame portion 159a, and a first opening detection sensor 321 and a second opening detection sensor 322 are attached to the sensor fixing plate 159c. The first and second open detection sensors 321 and 322 are light transmissive sensors, and as shown in FIG. 18A, when the ADF 51 is closed, the light receiving units and the light emitting units of the sensors 321 and 322 Are opposed to each other with the filler member 323 interposed therebetween.

  When the ADF 51 is opened, first, the first opening detection sensor 321 receives light from the light emitting unit and detects that the ADF 51 is opened. When the first opening detection sensor 321 detects that the ADF 51 is opened, the main body control unit 200 starts time measurement. Further, when the ADF 51 is opened, the second open detection sensor 322 receives light from the light emitting unit and detects that the ADF 51 is opened. When the second opening detection sensor 322 detects that the ADF 51 is opened, the main body control unit 200 ends the time measurement. The main body control unit 200 detects the opening speed Vup of the ADF 51 from the time from when the first opening detection sensor 321 detects opening of the ADF 51 until the second opening detection sensor 322 detects opening of the ADF 51. . That is, in the present embodiment, the first opening detection sensor 321, the second opening detection sensor 322, the filler member 323, the main body control unit 200, and the like constitute an opening speed detection unit.

FIG. 20 is a control flow diagram when the ADF 51 is opened during the movement of the first contact glass.
First, when the second opening detection sensor 322 detects the opening of the ADF 51 (YES in S1), the main body control unit 200 detects the position of the first contact glass 154. The main body control unit 200 detects the position of the first contact glass 154 based on the pulse count and rotation direction of the cam drive motor 173, the drive ON / OFF, the home position sensor 175, and the like. That is, the main body control unit 200 functions as a position detection unit. When the home position sensor 175 detects that the first contact glass 154 is at the home position (position a in FIG. 17) (YES in S2), the movement control of the first contact glass 154 is not performed. finish.

  On the other hand, when the cam drive motor 173 is rotating forward, that is, when the position of the first contact glass 154 is b to d (YES in S3) in FIG. ), It is determined whether the opening speed Vup of the ADF 51 is equal to or higher than the first specified speed Vb (S31). When the opening speed Vup of the ADF 51 is equal to or higher than the first specified speed Vb (YES in S31), the main body control unit 200 determines that the position of the first contact glass 154 is based on the pulse count of the cam drive motor 173. It is determined whether it is close to (position a in FIG. 17) (S32). When the position of the first contact glass 154 is close to the home position (the position of a in FIG. 17) (YES in S32), the main body control unit 200 rotates the cam drive motor 173 in the reverse direction to thereby rotate the first contact glass 154. Is returned to the home position (position a in FIG. 17) (S33). On the other hand, when the position of the first contact glass 154 is far from the home position (position a in FIG. 17) (NO in S32), the first contact glass is moved to the most downstream side (e in FIG. 17) of the first contact glass movable range. The contact glass 154 is moved (S34) and stopped.

  On the other hand, when the opening speed Vup of the ADF 51 is less than the first specified speed Vb (NO in S31), it is determined whether or not the opening speed Vup of the ADF 51 is faster than the second specified speed Va (S35). When the opening speed Vup of the ADF 51 is faster than the second specified speed Va (YES in S35), the first contact glass 154 is moved to the most downstream side (e in FIG. 17) of the first contact glass movable range (S36). Let me stop. On the other hand, when the opening speed Vup of the ADF 51 is equal to or lower than the second specified speed Va (NO in S35), the first contact glass 154 is moved to the most downstream side (e in FIG. 17) of the first contact glass movable range (S37). ), The cam drive motor 173 is reversely driven to move the first contact glass 154 to the home position (position a in FIG. 17).

  On the other hand, as shown in FIG. 20A, when the ADF 51 is opened, the first contact glass 154 is located at the most downstream side (e in FIG. 17) of the first contact glass movable range (in S3). YES), as shown in FIG. 20C, it is determined whether or not the opening speed Vup of the ADF 51 is equal to or lower than the second specified speed Va (S41). If the opening speed Vup of the ADF 51 is faster than the second specified speed Va (NO in S41), the process ends without moving the first contact glass. On the other hand, when the opening speed Vup of the ADF 51 is equal to or lower than the second specified speed Va (YES in S41), the first contact glass is moved to the home position (position a in FIG. 17) (S42).

  On the other hand, as shown in FIG. 20A, when the cam drive motor 173 is driven in reverse, that is, when the position of the first contact glass 154 is f to h (NO in S4) of FIG. As shown in FIG. 20D, it is determined whether the opening speed Vup of the ADF 51 is equal to or higher than the first specified speed Vb (S43). When the opening speed Vup of the ADF 51 is equal to or higher than the first specified speed Vb (YES in S43), the main body control unit 200 determines that the position of the first contact glass is based on the pulse count of the cam drive motor 173 as the home position ( It is determined whether or not it is close to the position (a in FIG. 17) (S44). When the position of the first contact glass 154 is close to the home position (position a in FIG. 17) (YES in S44), the main body controller 200 moves the first contact glass 154 to the home position (position a in FIG. 17). ) (S45). On the other hand, when the position of the first contact glass 154 is far from the home position (position a in FIG. 17) (NO in S44), the first contact glass moves to the most downstream side (e in FIG. 17) of the first contact glass movable range. The contact glass 154 is returned (S34) and stopped.

  On the other hand, when the opening speed Vup of the ADF 51 is less than the first specified speed Vb (NO in S43), the first contact glass 154 is moved to the home position (position a in FIG. 17) (S47).

  Thus, in this embodiment, even if the ADF 51 is opened during the movement of the first contact glass, the first contact glass 154 is a position where both the cleaning member and the glass cleaning member are in contact with the object to be cleaned. Position (a in FIG. 17) or the most downstream side (e in FIG. 17) of the first contact glass movable range. Therefore, it is possible to prevent the clip or the like from entering the gap or the dust collected by the dust collecting member from rising and adhering to the first contact glass 154 or the intermediate guide member again.

The movement of the first contact glass 154 is controlled based on the opening speed Vup of the ADF 51 and the position of the first contact glass when the opening of the ADF 51 is started. That is, when the opening speed Vup of the ADF 51 is fast, the first contact glass 154 is moved to the closest position between the positions a and e in FIG. 17, so that when the ADF 51 is completely opened. The situation where the first contact glass 154 is moving is suppressed.
In addition, when the first contact glass 154 is in the positions b to d in FIG. 17, when the ADF opening speed is Va ≦ Vup <Vb, the first contact glass 154 is moved to the position e in FIG. When the first contact glass 154 is opened, the situation in which the first contact glass 154 is moving is suppressed, and the document conveying surface of the first contact glass 154 can be cleaned.
Further, when the opening speed Vup of the ADF 51 is slowly opened below Va, the reciprocating operation of the first contact glass 154 is completed. Therefore, when the ADF 51 is completely opened, the situation where the first contact glass 154 is moving is suppressed, and the document conveying surface of the first contact glass 154 and the intermediate guide member 305 are cleaned. Can be.

  In the present embodiment, after the image reading operation is completed, the first contact glass is moved in the direction opposite to the document conveying direction to return to the home position. Thereby, even if the ADF 51 is opened with the apparatus turned off, the first contact glass 154 can be positioned at an unexposed position below the upstream guide portion 158. Thereby, it can suppress that a user contacts the 1st contact glass 154 carelessly and the 1st contact glass 154 is damaged.

  In addition, dust that cannot be removed by the cleaning member 301, for example, correction fluid stuck to the first contact glass 154, needs to be manually cleaned. For this reason, when the ADF 51 is opened, if the first contact glass is positioned at the home position, it is not possible to manually clean the document conveying surface of the first contact glass. In addition, when the ADF 51 is opened to replace the contact glass 154, the first contact glass cannot be easily replaced if the first contact glass is positioned at the home position. Therefore, in the present embodiment, a manual cleaning mode is provided, and when the manual cleaning mode is executed, the first contact glass 154 is moved from the home position to the most downstream side of the first contact glass movable range (e in FIG. 17). Control to move to).

FIG. 21 is a control flowchart of the manual cleaning mode.
As shown in the figure, when the user operates the operation unit 201 to execute the manual cleaning mode (YES in S51), the main body control unit 200 detects whether there is a document in the vicinity of reading (S52). If the first contact glass is moved in a state where there is a document in the vicinity of the reading position, the document may enter a gap between the intermediate guide member and the guide cleaning member. Therefore, if there is a document in the vicinity of reading (NO in S52), a warning message (Please remove the document) (S53) is displayed on the display of the operation unit 201, and the process is terminated.
On the other hand, when there is no document near the reading position (YES in S52), the first contact glass 154 is moved from the home position to the most downstream side (e in FIG. 17) of the first contact glass movable range (S54). ,finish.

  As described above, when the manual cleaning mode is provided and the first contact glass 154 is opened from the home position and the ADF 51 is opened, the downstream side of the first contact glass movable range where the document conveying surface of the first contact glass 154 is exposed (see FIG. 17). Since it moves to e), the 1st contact glass 154 can be easily cleaned manually. Further, when the first contact glass 154 is replaced, the first contact glass 154 can be easily replaced by executing the manual cleaning mode and moving the first contact glass 154 to e in FIG.

In addition, even when a document jam occurs during document conveyance, the ADF 51 is opened for paper jam processing. Therefore, it is preferable to move the first contact glass 154 to the positions a and e in FIG. However, if the first contact glass 154 is moved in a state where a document is in the vicinity of the reading position, the document may be moved between the intermediate guide member 305 and the guide cleaning member 303 or between the cleaning member 301 and the first contact glass 154. There is a risk of entering the gap.
Therefore, in this embodiment, when a document is jammed, if there is a document in the vicinity of the reading position (the first contact glass and the intermediate guide member movable range), the movement of the first contact glass 154 is prohibited, and there is no document. Moves the first contact glass 154 to positions a and e in FIG.

FIG. 22 is a control flow when a document is jammed.
As shown in the figure, when a document jam occurs (YES in S61), the movement of the first contact glass 154 is stopped to detect whether there is a document in the vicinity of the reading position (S62). Whether or not there is a document in the vicinity of the reading position can be detected using, for example, a paper discharge sensor 61, a registration sensor 65, a pulse count of the reading motor 77, a pulse count of the paper discharge motor 78, and the like. For example, when both the paper discharge sensor 61 and the registration sensor 65 are ON, it can be detected that there is a document at the reading position. When both the paper discharge sensor 61 and the registration sensor 65 are OFF, there is no document at the reading position. Can be detected. Further, when the paper discharge sensor is OFF and the registration sensor is ON, it is possible to detect whether the document is near the reading position based on the pulse count of the reading motor 77. When the paper discharge sensor is ON and the registration sensor is OFF, it can be detected from the pulse count value of the paper discharge motor 78 whether or not the trailing edge of the document is in the vicinity of the reading position.

  If there is no document in the vicinity of the reading position (YES in S62), the movement of the first contact glass 154 is resumed to complete the reciprocation of the first contact glass 154 (S63 to S69). On the other hand, if there is a document in the vicinity of the reading position (NO in S62), the movement control is terminated.

  As described above, when there is a document in the vicinity of the reading position when the document is jammed, the first contact glass 154 is not moved, so that the document has a gap between the cleaning member 301 and the first contact glass 154 or guide cleaning. Entering between the member 303 and the intermediate guide member 305 is suppressed, and damage to the document can be suppressed.

  Further, in the above description, the cleaning member 301 is brought into contact with the first contact glass 154 during the movement of the first contact glass and the guide cleaning member 303 is brought into contact with the intermediate guide member 305 during the backward movement. Absent. For example, the cleaning member 301 and the guide cleaning member 303 may be brought into contact with each other when the first contact glass 154 moves in the return path. In this case, the deposit on the first contact glass 154 removed by the cleaning member 301 moves to the intermediate guide member 305, and the deposit on the first contact glass 154 moved to the intermediate guide member 305 by the guide cleaning member 303. Is removed. With this configuration, there is a merit that a single dust collection member can be used. Further, the cleaning member 301 and the guide cleaning member 303 may be brought into contact with each other when the first contact glass 154 moves forward. In this case, the deposit on the intermediate guide member 305 removed by the guide cleaning member 303 moves to the downstream end of the first contact glass 154 in the document conveyance direction, and moves to the first contact glass 154 by the cleaning member 303. Deposits on the contact glass are removed. Also in this case, there is an advantage that a single dust collecting member can be used. Further, if a recovery hole for dropping dust is provided at the upstream end of the intermediate guide member 305 in the document conveyance direction, the cleaning member 301 is brought into contact when the first contact glass moves backward, and the first contact glass 154 moves forward. Sometimes the guide cleaning member 303 can be brought into contact. In this case, the deposit on the first contact glass 154 removed by the cleaning member 301 falls from the recovery hole to the dust recovery member. Further, the deposit on the intermediate guide member 305 removed by the guide cleaning member 303 falls from the recovery hole to the dust recovery member. Therefore, it is possible to remove almost all the deposits removed by the cleaning member 301 from the first contact glass 154 and the intermediate guide member 305.

  As described above, the scanner 150 as the image reading apparatus according to the present embodiment is a so-called sheet-through type scanner that reads an image of the original conveyed to the reading position on the first contact glass with the first surface fixed reading unit 151 as a reading unit. 150. The scanner 150 according to the present embodiment is a glass that is a moving member that reciprocally moves the first contact glass 154 in the document conveyance direction, and a cleaning member 301 that contacts the document conveyance surface of the first contact glass and cleans the document conveyance surface. A moving mechanism 180 and a cleaning member contacting / separating mechanism 190 serving as a cleaning member contacting / separating unit that contacts and separates the cleaning member 301 with respect to the document conveying surface of the first contact glass 154 are provided. Then, when the first contact glass 154 moves forward or backward, the cleaning member 301 is separated from the first contact glass document conveying surface by the cleaning member contact / separation mechanism 190. As a result, only when the first contact glass 154 moves forward or backward, the cleaning member 301 comes into contact with the first contact glass document conveyance surface and adheres to the portion corresponding to the reading position on the document conveyance surface. Can be removed. Therefore, the cleaning member 301 rubs against the contact glass document conveyance surface only when the cleaning member 301 cleans the first contact glass document conveyance surface. Therefore, the lifetime of the cleaning member 301 can be extended and damage to the first contact glass 154 can be suppressed as compared with the case where the cleaning member 301 is always in contact with the first contact glass document conveying surface. .

  Further, when the first contact glass 154 moves in a direction away from the cleaning member 301, the cleaning member 301 is preferably brought into contact with the document conveying surface of the first contact glass. Thereby, the deposit on the first contact glass removed by the cleaning member 301 is suppressed from remaining on the document conveyance path. Therefore, it is possible to prevent the adhered material on the first contact glass removed by the cleaning member 301 from adhering to the document and soiling the document.

  Further, the reciprocating movement of the first contact glass 154 and the contact / separation operation of the cleaning member 301 are performed by the same drive source, so that the number of parts can be reduced, and the apparatus can be made compact and the apparatus cost can be reduced. be able to.

In order to perform the reciprocating movement of the first contact glass 154 and the contact / separation operation of the cleaning member 301 with the same driving source, the cleaning member contact / separation mechanism 190 has the following configuration. That is, the cleaning member 301 includes a guide pin 301b, a loop-shaped guide groove 308a that engages with the guide pin 301b, and a cleaning member guide 308 that moves integrally with the first contact glass 154. ing. The guide groove 308a has at least the following three portions. That is, when the first contact glass 154 moves in one direction, the second groove portion, which is a portion that guides the guide pin 301b in a direction away from the document conveying surface of the first contact glass 154, and the first contact glass 154 A fourth groove portion M4 that is a portion that guides the guide pin 301b from a position away from the document conveyance surface of the first contact glass 154 to a position adjacent to the first contact glass 154 when moved to one end of the movable range of the first contact glass, and the first contact glass 154. The guide pin 301b is a portion that guides the guide pin 301b in parallel with the document conveying surface of the first contact glass 154 at a position where the guide pin 301b is close to the document conveying surface of the first contact glass 154 when moving in the other direction. 1 groove portion M1. When the first contact glass 154 moves in one direction (in the present embodiment, during the backward movement), the guide pin 301b is guided to the second groove M2, so that the cleaning member 301 conveys the original of the first contact glass 154. Separate from the surface. When the first contact glass 154 moves to one end (home position in the present embodiment) of the first contact glass movable range, the guide pin 301b is guided to the fourth groove portion M4, and the original of the first contact glass 154 It moves from a position away from the transport surface to a close position. As a result, the cleaning member 301 comes into contact with the document conveying surface of the first contact glass 154. Then, when the first contact glass 154 moves in the other direction (in the present embodiment, when moving in the forward direction), the guide pin 301b is guided to the first groove portion M1, so that the cleaning member 301 is an original of the first contact glass. By sliding with the conveyance surface, dust on the document conveyance surface can be removed.
By configuring the cleaning member contacting / separating mechanism 190 as described above, the cleaning member 301 can be contacted and separated in conjunction with the reciprocating movement of the first contact glass 154, and the drive source can be made one.

  Further, when the ADF 51 serving as the document conveying means is opened, the foreign member can be prevented from entering the gap between the cleaning member 301 and the contact glass 154 by bringing the cleaning member 301 into contact with the contact glass 154.

  In addition, the scanner 150 as an image reading apparatus according to the present embodiment moves integrally with the first contact glass 154, an intermediate guide member 305 as a guide member for guiding the document MS, and a document conveyance surface of the intermediate guide member 305. A guide cleaning member 303 that contacts and cleans the document conveying surface, and a guide cleaning member contacting / separating mechanism that is a guide cleaning member contacting / separating unit that contacts and separates the guide cleaning member 303 with respect to the document document guide surface 305a of the first contact glass 154. 210. Then, when the first contact glass 154 moves forward or backward, the guide cleaning member contact / separation mechanism 210 moves the guide cleaning member 303 away from the intermediate guide member 305 original guide surface 305a. Thus, only when the first contact glass 154 moves forward or backward, the guide cleaning member 303 comes into contact with the document guide surface 305a of the intermediate guide member 305 to remove the deposits attached to the document guide surface 305a. Can do. Therefore, only when the document guide surface 305a is cleaned by the guide cleaning member 303, the guide cleaning member 303 slides on the document guide surface 305a. Therefore, the life of the guide cleaning member 303 can be extended as compared with the case where the guide cleaning member 303 is always in contact with the document guide surface 305a.

  In addition, when the intermediate guide member 305 moves in a direction away from the guide cleaning member 303, the guide cleaning member 303 is preferably brought into contact with the document guide surface 305a. As a result, the deposit on the guide surface removed by the guide cleaning member 303 is suppressed from remaining on the document conveyance path. Therefore, it is possible to suppress the adhering matter on the guide surface removed by the guide cleaning member 303 from adhering to the original and staining the original.

  Further, the reciprocating movement of the first contact glass 154 and the contact / separation operation of the guide cleaning member 303 can be performed with the same drive source, so that the number of parts can be reduced and the apparatus can be made compact and the apparatus can be reduced in cost. You can plan.

Further, in order to perform the reciprocating movement of the first contact glass 154 and the contact / separation operation of the guide cleaning member 303 with the same drive source, the guide cleaning member contact / separation mechanism 210 has the following configuration. That is, a guide pin 156e provided in a scooping guide member 156 that is a holding member that holds the guide cleaning member so as to be movable up and down, and a loop-shaped guide groove 310a that engages with the guide pin 156e are formed, and the intermediate guide member 305 is formed. And a guide cleaning member guide 310 that moves integrally therewith. The guide groove 310a has at least the following three portions. That is, when the first contact glass 154 moves in one direction (in the present embodiment, when moving in the forward direction), the second groove N2 that is a portion that guides the guide pin 156e in a direction away from the document guide surface 305a, and the first When the contact glass 154 moves to one end of the movable range of the first contact glass 154 (in the present embodiment, the downstream end of the movable range in the document transport direction), the guide pin moves from a position away from the document guide surface 305a to a position close to it. At the position where the guide pin 156e is close to the document guide surface 305a when moving in the other direction of the first contact glass 154 (in the present embodiment, when moving in the backward direction), the fourth groove portion N4 serving as a portion that guides 156e, The guide pin 156e has a first groove portion N1 that is a portion for guiding the guide pin 156e in parallel to the document guide surface 305a. .
When the first contact glass 154 moves forward, the guide pin 156e is guided by the second groove portion N2, so that the guide cleaning member 303 is separated from the document guide surface 305a. When the first contact glass 154 moves to the downstream end of the first contact glass movable range in the document conveyance direction, the guide pin 156e is guided by the fourth groove portion N4, and is positioned close to the position away from the document guide surface 305a. Move to. As a result, the guide cleaning member 303 comes into contact with the document guide surface 305a. When the first contact glass 154 moves backward, the guide pin 156e is guided by the first groove N1, so that the guide cleaning member 303 slides on the document guide surface 305a to remove dust on the guide surface. can do.
By configuring the guide cleaning member contacting / separating mechanism 210 as described above, the guide cleaning member 303 can be contacted and separated in conjunction with the reciprocating movement of the first contact glass 154, and the drive source can be integrated. .

  Further, when the ADF 51 is opened, the guide cleaning member 303 is brought into contact with the document guide surface 305 a, whereby foreign matter can be prevented from entering the gap between the guide cleaning member 303 and the intermediate guide member 305.

  Further, the main body control unit 200 serving as a control unit controls the glass moving mechanism 180 so that when the ADF 51 is opened, the first moving glass 180 is moved to a home position that is a retracted position where the document conveying surface of the first contact glass 154 is not exposed. Thereby, it is possible to prevent the original conveying surface of the first contact glass 154 from being inadvertently touched by the user and being damaged.

  Further, the main body control unit 200 is based on the opening speed of the ADF 51 detected by the opening speed detection means configured by the first opening detection sensor 321, the second opening detection sensor 322, the filler member 323, the main body control unit 200, and the like. It is determined whether or not to perform control for moving the first contact glass 154 to the home position. As a result, if the first contact glass 154 can move to the home position until the opening speed is slow and the ADF 51 is fully opened, the following effects can be obtained if it is determined to control the movement to the home position. Can be obtained. That is, it can be suppressed that the first contact glass 154 moves when the ADF 51 is completely opened. As a result, an object placed on the first contact glass by the user may enter the gap between the cleaning member and the first contact glass, and the object may be damaged or the surface of the first contact glass 154 may be damaged. Can be suppressed.

  Whether or not to perform control to move the first contact glass 154 to the home position based on the position of the first contact glass 154 when the opening operation of the ADF 51 detected by the main body control unit 200 as the position detection means is started. To decide. Accordingly, if the first contact glass is returned to the home position when the first contact glass can be returned to the home position before the ADF 51 is completely opened, the following effects can be obtained. Can be obtained. That is, it can be suppressed that the first contact glass 154 moves when the ADF 51 is completely opened. As a result, an object placed on the first contact glass by the user may enter the gap between the cleaning member and the first contact glass, and the object may be damaged or the surface of the first contact glass 154 may be damaged. Can be suppressed.

  The main body control unit 200 controls the first contact glass 154 to move to the home position when a document jam occurs. As a result, when the ADF 51 is opened for paper jam processing, the original conveyance surface of the first contact glass 154 is not exposed. Therefore, the user carelessly touches the original conveyance surface of the first contact glass 154 during paper jam processing. It is possible to suppress the touch of the original conveying surface of the first contact glass from being damaged.

  Further, the main body control unit 200 does not perform control to return the first contact glass 154 to the home position when there is a document near the first contact glass at the time of paper jam. Thereby, the original in the vicinity of the first contact glass is not caught in the gap between the first contact glass and the cleaning member, and the original can be prevented from being damaged.

  In addition, the main body control unit 200 controls the first contact glass 154 to return to the home position after the job is finished, so that even if the ADF 51 is opened after the job is finished and the apparatus power is turned off, Since the contact glass 154 is located at the home position below the upstream guide portion 158, the document conveying surface of the first contact glass 154 is not exposed. Therefore, it is possible to suppress the original conveying surface of the first contact glass 154 from being damaged.

  In addition, when the manual cleaning mode is executed, the main body control unit 200 detects the position where the document conveying surface of the first contact glass 154 is exposed when the ADF 51 is opened from the home position (in the present embodiment, the first contact glass). The first contact glass 154 is moved to the most downstream end of the movable range in the document conveyance direction. As a result, the manual conveyance surface can be easily cleaned manually. Moreover, if the manual cleaning mode is executed when the first contact glass is replaced, the first contact glass 154 can be easily replaced.

  Further, since the copying machine includes the above-described document conveyance reading device 50, a high-quality copy image can be obtained over a long period of time.

1: Image forming unit 2: Optical writing device 3K, Y, M, C: Process unit 50: Document reading device 53: Document placing table 54: Moveable document table 55: Document stacking table 56: Pickup motor 57: First document Length detection sensor 58: second document length detection sensor 59: proper feeding position sensor 61: paper discharge sensor 63: document set sensor 65: registration sensor 66: intermediate roller pair 67: reading entrance sensor 72: abutment sensor 73 : Document width sensor 76: Paper feed motor 77: Reading motor 78: Paper discharge motor 79: Bottom plate raising motor 80: Pickup roller 84: Paper feed belt 85: Reverse roller 86: Pull-out drive roller 87: Pull-out driven roller 92: Reading exit Roller pair 94: paper discharge roller pair 95: second fixed reading unit 96: reading roller 150: scanner 151: first surface fixed Taking part 152: Moving reading part 153: Image reading sensor 154: First contact glass 155: Second contact glass 156: Scooping guide member 156b: Guide surface 156e: Guide pin 156d: Claw part 156f: Through hole 157: Lid member 158: Upstream guide portion 159: Hinge 171: Fixing member 173: Cam drive motor 174: Rotating cam 175: Home position sensor 180: Glass moving mechanism 190: Cleaning member contacting / separating mechanism 200: Main body controller 210: Guide cleaning member contacting / separating Mechanism 301: Cleaning member 301b: Guide pin 303: Guide cleaning member 305: Intermediate guide member 305a: Document guide surface 307: Cleaning member support plate 308: Cleaning member guide 308a: Guide groove 309: Guide switching claw 310: Guide cleaning member guide 310a: Guide groove 311: Guide cutting Pawl 321: first open detection sensor 322: second open detection sensor 323: filler member

Japanese Patent No. 4097876

Claims (29)

In an image reading apparatus that reads an image of a document that is conveyed at a reading position on a contact glass with a reading unit fixed,
A cleaning member that comes into contact with the document conveying surface of the contact glass and cleans the document conveying surface;
Moving means for reciprocating the contact glass in the document conveying direction;
An image reading apparatus comprising: a cleaning member contacting / separating means for contacting and separating the cleaning member with respect to a document conveying surface of contact glass. The image reading apparatus according to claim 1.
In either the forward movement or the backward movement of the contact glass,
An image reading apparatus, wherein the cleaning member is separated from the contact glass document conveying surface by the cleaning member contacting / separating means. The image reading apparatus according to claim 2.
An image reading apparatus comprising: the cleaning member contacting / separating unit configured to bring the cleaning member into contact with a document conveying surface of the contact glass when the contact glass moves in a direction away from the cleaning member. The image reading apparatus according to claim 1,
An image reading apparatus, wherein the reciprocating movement of the contact glass and the contact / separation operation of the cleaning member are performed by the same driving source. The image reading apparatus according to claim 4.
The cleaning member contacting / separating means includes
A guide pin provided on the cleaning member;
A loop-shaped guide groove that engages with the guide pin is formed, and has a cleaning member guide member that moves integrally with the contact glass, and the guide groove is at least moved in one direction of the contact glass. A portion for guiding the guide pin in a direction away from the document conveying surface of the contact glass, and a position away from the document conveying surface of the contact glass when the contact glass moves to one end of the movable range of the contact glass. A portion for guiding the guide pin to a close position, and when the guide glass is moved in the other direction, the guide pin is close to the original transport surface of the contact glass, with respect to the original transport surface of the contact glass. An image reading apparatus having a portion for guiding the guide pin in parallel. In a document conveying / reading apparatus comprising: an image reading device that reads an image recorded on a document; and a document conveying unit that conveys the document to a document reading position by the image reading device.
6. A document conveying / reading apparatus comprising the image reading apparatus according to any one of claims 1 to 5. The document conveying / reading apparatus according to claim 6.
The document conveying means is attached to the image reading device so as to be freely opened and closed.
An original conveying / reading apparatus, wherein the cleaning member is brought into contact with the contact glass when the original conveying means is opened. In an image reading apparatus that reads an image of a document that is conveyed at a reading position on a contact glass with a reading unit fixed,
Moving means for reciprocating the contact glass in the document conveying direction;
A guide member that moves integrally with the contact glass and guides the document;
A guide cleaning member that contacts the document guide surface of the guide member and cleans the document guide surface;
An image reading apparatus comprising: a guide cleaning member contacting / separating unit that contacts and separates the guide cleaning member with respect to a document guide surface of the guide member. The image reading apparatus according to claim 8.
In either the forward movement or the backward movement of the contact glass,
An image reading apparatus characterized in that the guide cleaning member is separated from the document guide surface by the guide cleaning member contacting / separating means. The image reading apparatus according to claim 9.
An image reading apparatus comprising: the guide cleaning member contacting / separating unit configured to bring the guide cleaning member into contact with the document guide surface when the guide member moves in a direction away from the guide cleaning member. The image reading apparatus according to any one of claims 8 to 10,
An image reading apparatus characterized in that the moving means and the guide cleaning member contacting / separating means are driven by the same drive source. The image reading apparatus according to claim 11.
The guide cleaning member contacting / separating means includes:
A guide pin provided on a holding member that holds the guide cleaning member so as to be movable up and down;
A loop-shaped guide groove that engages with the guide pin is formed, and has a guide cleaning member guide that moves integrally with the guide member, and the guide groove moves at least in one direction of the contact glass. A portion for guiding the guide pin in a direction away from the document guide surface, and the guide from a position separated from the document guide surface to a position adjacent to the contact glass when the contact glass moves to one end of a movable range of the contact glass. A portion for guiding the pin; and a portion for guiding the guide pin in parallel with the document guide surface at a position close to the document guide surface when the contact glass moves in the other direction. An image reading apparatus. In a document conveying / reading apparatus comprising: an image reading device that reads an image recorded on a document; and a document conveying unit that conveys the document to a document reading position by the image reading device.
A document conveying / reading apparatus using the image reading apparatus according to any one of claims 8 to 12. The document conveyance reading apparatus according to claim 13.
The document conveying means is attached to the image reading device so as to be freely opened and closed.
An original conveying / reading apparatus, wherein the guide cleaning member is brought into contact with the original guide surface when the original conveying means is opened. The image reading apparatus according to claim 1,
A guide member that moves integrally with the contact glass and guides the document;
A guide cleaning member that contacts the document guide surface of the guide member and cleans the document guide surface;
An image reading apparatus comprising: a guide cleaning member contacting / separating unit that contacts and separates the guide cleaning member with respect to the document guide surface. The image reading apparatus according to claim 15.
In either the forward movement or the backward movement of the contact glass,
An image reading apparatus characterized in that the guide cleaning member is separated from the document guide surface by the guide cleaning member contacting / separating means. The image reading apparatus according to claim 16.
An image reading apparatus comprising: the guide cleaning member contacting / separating unit configured to bring the guide cleaning member into contact with the document guide surface when the contact glass moves in a direction away from the guide cleaning member. The image reading apparatus according to any one of claims 15 to 17,
An image reading apparatus characterized in that the moving means and the guide cleaning member contacting / separating means are driven by the same drive source. The image reading apparatus according to claim 18.
The guide cleaning member contacting / separating means includes:
A guide pin provided on a holding member that holds the guide cleaning member so as to be movable up and down;
A loop-shaped guide groove that engages with the guide pin is formed, and has a guide cleaning member guide that moves integrally with the guide member, and the guide groove moves at least in one direction of the contact glass. A portion for guiding the guide pin in a direction away from the document guide surface, and the guide from a position separated from the document guide surface to a position adjacent to the contact glass when the contact glass moves to one end of a movable range of the contact glass. A portion for guiding the pin; and a portion for guiding the guide pin in parallel with the document guide surface at a position close to the document guide surface when the contact glass moves in the other direction. An image reading apparatus. In a document conveying / reading apparatus comprising: an image reading device that reads an image recorded on a document; and a document conveying unit that conveys the document to a document reading position by the image reading device.
21. A document conveying / reading apparatus using the image reading apparatus according to any one of claims 15 to 19. The document conveying / reading apparatus according to claim 20,
The document conveying means is attached to the image reading device so as to be freely opened and closed.
An original conveying / reading apparatus, wherein when the original conveying means is opened, the guide cleaning member is brought into contact with the original guide surface, and the cleaning member is brought into contact with the contact glass original conveying surface. In the document conveying / reading apparatus according to claim 6, 7, 13, 14, 20, or 21,
The document conveying means is attached to the image reading device so as to be freely opened and closed.
A document conveying / reading apparatus, comprising: a control unit that controls a moving unit to move to a retracted position where the document conveying surface of the contact glass is not exposed when the document conveying unit is opened. The document conveying / reading apparatus according to claim 22,
An opening speed detecting means for detecting an opening speed of the document conveying means is provided;
An original conveying / reading apparatus comprising: a control unit configured to determine whether to perform control for moving the contact glass to the retracted position based on a detection result of the opening speed detection unit. 24. The document conveying / reading apparatus according to claim 22 or 23.
Providing a position detecting means for detecting the position of the contact glass when the opening operation of the document conveying means is started;
An original conveying / reading apparatus comprising: a control unit configured to determine whether to perform control for moving the contact glass to the retracted position based on a detection result of the position detection unit. 25. The document conveying and reading apparatus according to claim 22,
The document conveying and reading apparatus, wherein the control unit controls a moving unit to move the contact glass to the retracted position when the document jam occurs. 26. The document conveying / reading apparatus according to claim 25.
An original conveying / reading apparatus, wherein the control means is configured not to move the contact glass to the retracted position when an original is in the vicinity of the contact glass when the original is jammed. 27. The document conveying / reading apparatus according to claim 22,
The document conveying and reading apparatus, wherein the control unit controls the moving unit to move the contact glass to the retracted position after the job is completed. 27. A document conveying and reading apparatus according to claim 27.
A manual cleaning mode for manually cleaning the document conveying surface of the contact glass is provided.
When the manual cleaning mode is executed, the control means moves the contact glass from the retracted position to a position where the document conveying surface of the contact glass is exposed when the conveying means is opened. A document conveying and reading apparatus characterized by controlling the above. An image forming unit for forming an image on a recording material, and a document conveying / reading unit for reading an image of the document while conveying the document, and the image read by the document conveying / reading unit on the recording material by the image forming unit In the copying machine for copying the original,
A document conveying and reading device according to any one of claims 6, 7, 13, 14, 20, 21, 22, 23, 24, 25, 26, 27, or 28 is used as the document conveying and reading means. Copy machine to do.

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