JP2008124623A - Image reader and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet material feeder to read a document conveyed apart from a glass plate without correcting focal length, and an image forming apparatus equipped with the same. <P>SOLUTION: When a document sheet material P is set on the automatic document feeder and a start button is pushed, a driving pulley 70 rotates and then a rotary roller 66 provided on a flank 15B of a read unit 14 moves onto a slope portion 60B, so that while a coil spring 64 provided between a coupling bracket 40 and a receiving member 62 shrinks, the read unit 14 is lifted. Then the rotary roller 66 reaches a lift portion 60A and the read unit 14 moves to a read position. Thus, the read unit 14 is lifted, so that image information at a document read position R apart from the glass plate can be read without adjusting an optical system to correct the focal length. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image reading apparatus that reads an image recorded on a document, and an image forming apparatus including the image reading apparatus.

  The image reading apparatus has a function of placing an original sheet material on a glass plate and causing the reading unit to run along the glass plate to read an image of the original sheet material. Some have a function of passing the upper part and reading with the stopped reading unit.

When reading an image by conveying an original sheet material with an automatic document feeder, compared to reading an original sheet material on a glass plate, the read original sheet material moves away from the glass plate. The original is read after correction by the system. (Patent Document 1)
JP 2000-92268 A

  However, in this method, since the focal length has to be corrected, the reading unit becomes an expensive and complicated mechanism.

  In view of the above fact, the present invention has a problem of reading a document conveyed away from a light transmission plate such as a glass plate without correcting the focal length.

  An image reading apparatus according to a first aspect of the present invention includes a light transmission plate on which a document is placed, a document pressing member that presses the document placed on the light transmission plate, and a document reading position above the light transmission plate. A document conveying device that conveys a document, a reading unit that reads a document from a lower surface of a light transmission plate, a moving unit that moves the reading unit along the light transmission plate, and a reading unit that faces the document reading position. And lifting means for lifting.

  According to the above configuration, the moving unit moves the reading unit along the light transmission plate, and the reading unit reads the image information of the document placed on the light transmission plate.

  Further, the lifting means lifts the reading unit and reads the image information of the document conveyed to the document reading position above the light transmission plate by the document conveying device.

  That is, the lifting means lifts the reading unit by the distance between the original reading position conveyed by the original conveying device and the light transmission plate, thereby controlling the optical system and the imaging lens of the reading unit to set the focal length. A document conveyed away from the light transmission plate can be read without correction.

  An image reading apparatus according to a second aspect of the present invention is the image reading apparatus according to the first aspect, wherein the moving means is a drive pulley that is rotationally driven, a driven pulley that is rotatably provided, the drive pulley, and the driven pulley. An endless belt that is hung, a connecting means that connects the reading unit to the endless belt, and is movably attached to the reading unit, and a rail that is disposed along the moving direction of the reading unit. A rotating body attached to the reading unit and traveling on the rail, wherein the lifting means is a stop rail portion formed at an end of the rail and bent toward the document reading position. It is characterized by.

  According to the said structure, a drive pulley rotates and the endless belt wound around a drive pulley and a driven pulley is rotated. A reading unit is attached to the endless belt so as to be movable up and down by connecting means. Thereby, even if the vertical position of the reading unit and the endless belt changes, the reading unit can move along the glass plate. In addition, a rotating body attached to the reading unit is disposed on a rail arranged along the moving direction of the reading unit so as to be able to travel.

  Further, a stop rail portion that is bent toward the document reading position is formed at an end portion of the rail. That is, when the rotating body travels on the rail and moves to the stop rail portion, the reading unit is lifted toward the glass plate side toward the document reading position, and it is possible to remove from the document conveying device without optically correcting the focal length. The image information of the conveyed document can be read.

  An image reading apparatus according to a third aspect of the present invention is the image reading apparatus according to the first aspect, wherein the moving means is a drive pulley that is rotationally driven, a driven pulley that is rotatably provided, the drive pulley, and the driven pulley. An endless belt that is hung, a connecting means that connects the reading unit to the endless belt, and is attached to the reading unit so as to be movable up and down, and a rail disposed along the moving direction of the reading unit; And a cam attached to the reading unit and traveling along the rail. The lifting means is a driving means for rotating the cam at the document reading position.

  According to the said structure, a drive pulley rotates and the endless belt wound around a drive pulley and a driven pulley is rotated. A reading unit is attached to the endless belt so as to be movable up and down by connecting means. Thereby, even if the vertical position of the reading unit and the endless belt changes, the reading unit can move along the glass plate. Further, a cam attached to the reading unit runs on a rail arranged along the moving direction of the reading unit.

  When the reading unit moves to the document reading position, the driving means rotates the cam to lift the reading unit. In this manner, since the reading unit can be lifted on the spot, it is not necessary to provide a slope on the rail, and the image forming apparatus can be downsized.

  An image reading apparatus according to a fourth aspect of the present invention is the image reading apparatus according to the first aspect, wherein the moving means is a drive pulley that is rotationally driven, a driven pulley that is rotatably provided, the drive pulley, and the driven pulley. An endless belt that is hung, a connecting means that connects the reading unit to the endless belt, and is movably attached to the reading unit, and a rail that is disposed along the moving direction of the reading unit. A rotating body attached to the reading unit and running on the rail, and the lifting means is rotated by the rotating arm that is pressed by the reading unit that is moved by the moving means. And a lifting arm that rotates integrally with the moving arm and hits the bottom surface of the reading unit to lift the reading unit.

  According to the said structure, a drive pulley rotates and the endless belt wound around a drive pulley and a driven pulley is rotated. A reading unit is attached to the endless belt so as to be movable up and down by connecting means. Thereby, even if the vertical position of the reading unit and the endless belt changes, the reading unit can move along the glass plate. In addition, a rotating body attached to the reading unit is disposed on a rail arranged along the moving direction of the reading unit so as to be able to travel.

  When the reading unit moves to the document reading position, the reading unit presses the rotating arm. The rotating arm rotates to rotate the lifting arm. The lifting arm rotates and hits the bottom surface of the reading unit to lift the reading unit. In this way, since the reading unit can be lifted using the rotational force of the endless belt, no separate driving means is required.

  The layer reader according to claim 5 of the present invention is characterized in that, in any one of claims 2 to 4, the connecting means is connected to the reading unit by a spring material.

  According to the above configuration, the spring material absorbs vibration during running of the reading unit, and the reading unit can read the image information of the document in a stable state.

  An image forming apparatus according to a sixth aspect of the present invention includes the image reading device according to any one of the first to fifth aspects.

  According to the above configuration, since the image forming apparatus includes the image reading device according to any one of claims 1 to 5, the document conveyed away from the light transmission plate is optically corrected. Therefore, it is possible to obtain a high-quality output image that does not generate black streaks or the like.

  According to the present invention, a document conveyed away from a light transmission plate such as a glass plate can be read without correcting the focal length.

  An image forming apparatus 100 employing an image reading apparatus 10 according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 5, a paper feed cassette 18 is disposed in the lower part of the housing 102 of the image forming apparatus 100, and the paper feed cassette 18 is supplied to the image forming unit 111 of the image forming apparatus 100. Sheet materials P to be processed are stacked.

  Further, the sheet cassette 18 is provided with a bottom plate 16 on which the sheet material P is placed. When the sheet material P is fed to the image forming unit 111, the bottom plate 16 is lifted and lowered (not shown). Therefore, it moves upward. The uppermost sheet material P placed on the bottom plate 16 is pressed against the pickup roll 132. Further, when the paper feed cassette 18 is pulled out from the housing 102, the bottom plate 16 is moved downward by the lifting means so that the sheet material P can be stored in the paper feed cassette 18.

  Further, when the sheet material P is sent out to the image forming unit 111, the sheet material P is sequentially taken out by the pickup roll 132, and further conveyed one by one by the sheet feeding roll 122 and the separation roll 22 that are driven to rotate. It has become.

  In addition, a transport roll 106 is disposed at a predetermined position in the housing 102 and constitutes a transport path 108 for transporting the sheet material P. Further, guide members 128 arranged on both sides of the conveyance path 108 guide the sheet material P along the conveyance path 108. Hereinafter, simply “upstream” and “downstream” mean upstream and downstream in the conveying direction of the sheet material P, respectively.

  In the middle of the conveyance path 108, the photosensitive drum 110 is disposed so as to be in contact with the sheet material P, and rotates while being in contact with the sheet material P. The surface of the photosensitive drum 110 is charged by a charging device (not shown), and then a laser beam corresponding to image information is irradiated by the exposure device 112 to form an electrostatic latent image. Then, toner is supplied from the developing device 114 to the electrostatic latent image, and the electrostatic latent image is visualized as a toner image.

  The image forming unit 111 includes a photoconductive drum 110 and a transfer roll 130, and the photoconductive drum 110 holds the sheet material P between the transfer roll 130 and is in close contact with the sheet material P. As a result, the toner image on the photosensitive drum 110 is transferred to the sheet material P, and an image is formed on the sheet material P.

  Further, a fixing device 116 is disposed on the downstream side of the photosensitive drum 110. The fixing device 116 includes a heating roll 116H provided with a heater therein, and a pressure roll 116N pressed against the heating roll 116H. The sheet material P is nipped and conveyed by these two rolls to heat the sheet material P and fix the toner image on the sheet material P to the sheet material P.

  A discharge roll 118 is disposed on the downstream side of the fixing device 116, and the sheet material P on which the toner image is fixed is discharged to a discharge tray 126 provided above the casing 102 by the discharge roll 118. It has become.

  An image reading device 10 that reads image information of the original sheet material P is provided above the discharge tray 126. The image reading device 10 includes a platen glass 24 as a glass plate on which the original sheet material P is placed. I have.

  Further, a platen cover 26 as a document pressing member that covers the platen glass 24 so as to be openable and closable is provided on the upper side of the platen glass 24, and a plurality of documents are automatically placed inside the platen cover 26. An automatic document feeder 20 for feeding the document reading position R above 24 is provided.

  Further, the image reading apparatus main body 10A fitted with the platen glass 24 includes image information of the original sheet material P placed on the platen glass 24 and the original sheet material conveyed to the original reading position R by the automatic original conveying device 20. A reading unit 14 for reading P image information is provided. Details of the image reading apparatus 10 will be described later.

  In the image forming apparatus 100 configured as described above, an image is formed as follows.

  First, a charger (not shown) to which a voltage is applied uniformly charges the surface of the photosensitive drum 110 with a predetermined potential.

  Subsequently, based on the image information read by the image reading device 10, the exposure device 112 forms an electrostatic latent image on the charged photosensitive drum 110.

  That is, an electrostatic latent image corresponding to the image information is formed on the photosensitive drum 110 by turning on and off the laser beam emitted from the exposure device 112 based on image information supplied from a control device (not shown). Further, the electrostatic latent image is visualized as a toner image by the toner supplied from the developing device 114.

  Therefore, the sheet material P stored in the paper feed cassette 18 is sequentially taken out by the pickup roll 132 and sent out one by one to the conveyance path 108 by the paper feed roll 122 and the separation roll 22 that are rotationally driven. Further, the sheet material P is nipped and conveyed by the conveyance roll 106, passes through the image forming unit 111 between the photosensitive drum 110 and the transfer roll 130, and the toner image is transferred to the sheet material P. The transferred toner image is fixed on the sheet material P by passing between a heating roll 116H and a pressure roll 116N provided in the fixing device 116, and is discharged to a discharge tray 126 by a discharge roll 118.

  Next, the image reading apparatus 10 will be described in detail.

  As shown in FIG. 2A, the automatic document feeder 20 (ADF device) provided inside the platen cover 26 includes a plurality of sheets placed on a document tray 42 provided above the platen cover 26. A pickup roll 44 that sequentially feeds the original sheet material P, and a paper feed roll 46 and a separation roll 48 that convey the original sheet material P sequentially taken out by the pickup roll 44 one by one are provided.

  Further, a plurality of transport rolls 50 are provided for allowing the original sheet material P fed to the transport path 76 by the paper feed roll 46 and the separation roll 48 to pass through the document reading position R above the platen glass 24. Further, a discharge roll 54 for discharging the conveyed document sheet material P to a second discharge tray 52 provided above the platen glass 24 is provided downstream of the conveyance path 76.

  Further, a reading unit 14 that reads image information of the original sheet material P from the lower surface of the platen glass 24 is provided below the platen glass 24. A light source 30 that irradiates the image surface of the original sheet material P through the dust-proof glass 74 (see FIG. 1) inside the housing 15 of the rectangular parallelepiped reading unit 14 extending in the sheet material width direction (perpendicular direction in FIG. 2). In addition, there are provided flat mirrors 32 and 34 for reflecting the reflected light reflected from the original sheet material P to a predetermined position. Further, an imaging lens 28 is provided for imaging the light reflected by the plane mirrors 32 and 34 on the photoelectric conversion element 38. The light imaged by the photoelectric conversion element 38 is converted into an electric signal, and a reading circuit is provided. Image information is sent to the exposure apparatus 112 via the substrate 56.

  Further, moving means for moving the reading unit 14 along the platen glass 24 in the longitudinal direction of the sheet material (left and right direction in FIG. 2) is provided.

  As shown in FIG. 2B, the moving means is attached to one end of the moving area of the reading unit 14 and is driven to rotate in the forward and reverse directions, and moves opposite to the driving pulley 70. A driven pulley 72 is provided rotatably at the other end of the region. Further, an endless belt 36 is wound around the driving pulley 70 and the driven pulley 72, and as shown in FIG. 1, the side surface 15B of the casing 15 of the reading unit 14 serves as a connecting means. It is connected via two connecting brackets 40.

  Specifically, as shown in FIGS. 3A and 3B, the trapezoidal protrusion 40A provided on the connection bracket 40 is fitted in a groove 15D extending in the vertical direction of the side surface 15B. The connecting bracket 40 is attached so as to be movable in the vertical direction in the groove 15D. In addition, a rectangular receiving member 62 is provided on the side surface 15B of the housing 15, and the receiving member 62 and the connecting bracket 40 are connected by a coil spring 64 as a spring material that expands and contracts vertically.

  Further, as shown in FIG. 1, a plate-like rail 68 is provided on the side of the reading unit 14 along the moving direction of the reading unit 14. A rotating roller 66 as a rotating body traveling on the rail 68 is rotatably attached.

  With this configuration, the coil spring 64 biases the rotating roller 66 provided in the reading unit 14 toward the rail 68 via the receiving member 62, and the rotating roller 66 rotates on the rail 68. However, the reading unit 14 is configured to move. The rail 68 and the rotating roller 66 described above are provided at both ends of the reading unit 14.

  Further, a stop rail portion 60 as a lifting means for lifting the reading unit 14 to a stop position for reading the document sheet material P sent to the document reading position R by the automatic document feeder 20 (ADF device) is provided at the end of the rail 68. Is formed. The stop rail portion 60 is provided with a holding portion 60A that is close to the platen glass 24 side by a distance between the document reading position R and the platen glass 24, and an inclined portion 60B that connects the rail 68 and the holding portion 60A. When the original sheet material P sent to the document reading position R is read by the automatic document feeder 20 (ADF device), the rotation unit 66 moves up the inclined portion 60B and reaches the upper portion 60A to stop the reading unit 14 that has stopped. Image information of the original sheet material P that has passed the reading position R is read.

  With the above configuration, when reading the image information of the original sheet material P placed on the platen glass 24, first, as shown in FIG. 4A, the platen cover 26 is closed and the original sheet material P is pressed against the platen glass 24 as shown in FIG.

  When a start button (not shown) is pressed, the reading unit 14 shown in FIG. 2A reads the image information of the original sheet material P while moving from the position A toward the position B.

  Specifically, as shown in FIG. 1, the driving pulley 70 is rotated in the direction of arrow H by the rotational force of a motor (not shown), and the endless belt 36 wound around the driving pulley 70 and the driven pulley 72 is rotated. . As a result, the reading unit 14 coupled to the endless belt 36 via the coupling bracket 40 moves in the arrow K direction.

  As shown in FIG. 2A, when the reading unit 14 moves, light is applied to the original surface of the original sheet material P from the light source 30 through the platen glass 24, and the reflected light reflected downward is reflected by the flat mirror 32. The flat mirror 34 reflects the reflected light toward the photoelectric conversion element 38 disposed facing the flat mirror 34. The reflected light passes through an imaging lens 28 provided in the optical path between the plane mirror 34 and the photoelectric conversion element 38 and forms an image on the photoelectric conversion element 38. The photoelectric conversion element 38 converts the imaged light into an electrical signal. Convert and read.

  When reading of the image information of the original sheet material P on the platen glass 24 is completed, the drive pulley 70 rotates in the direction of the arrow J, and the reading unit 14 returns to the position A (see FIG. 2) for the next operation. Prepare.

  Next, when reading the image information of the document sheet P sent to the document reading position R by the automatic document feeder 20 (ADF device), first, the platen cover 26 is closed as shown in FIG. Then, the original sheet material P is placed on the original tray 42. This document sheet material P is detected by a sensor (not shown) provided in front of the pickup roll 44 and transmits to the control unit that the document sheet material P is set to the automatic document feeder 20. When a start button (not shown) is pressed, the original sheet material P is conveyed to the original reading position R after the reading unit 14 is positioned from the position A as shown in FIG.

  Specifically, as shown in FIG. 1, the driving pulley 70 is rotated in the direction of arrow J, whereby the endless belt 36 wound around the driving pulley 70 and the driven pulley 72 rotates and is connected to the endless belt 36. The reading unit 14 connected via the bracket 40 is moved in the arrow L direction.

  As a result, the rotating roller 66 provided on the side surface 15B of the reading unit 14 moves up the inclined portion 60B, so that the coil spring 64 provided between the connection bracket 40 and the receiving member 62 is as shown in FIG. The reading unit 14 is lifted while shrinking. Then, the rotation roller 66 reaches the upper holding portion 60A, and the reading unit 14 moves to the position C.

  Next, the document tray 42 is lifted by lifting means (not shown), and the uppermost document sheet material P placed thereon is pressed against the pickup roll 44. Then, the original sheet material P is sequentially taken out by the pick-up roll 44 and further fed out one by one to the transport path 76 by the paper feed roll 46 and the separation roll 48 that are driven to rotate. The fed document sheet material P is transported to the document reading position R by the transport roll 50. When the leading edge of the original sheet material P conveyed by a sensor (not shown) is detected, light is applied from the light source 30 of the reading unit 14 to the original surface, and the reflected light reflected downward by the flat mirror 32 is reflected by the flat mirror 34. The flat mirror 34 reflects the reflected light toward the photoelectric conversion element 38 disposed to face the flat mirror 34. The reflected light passes through an imaging lens 28 provided in the optical path between the plane mirror 34 and the photoelectric conversion element 38 and forms an image on the photoelectric conversion element 38. The photoelectric conversion element 38 converts the imaged light into an electrical signal. Convert and read.

  As described above, when reading the original sheet material P sent to the original reading position R by the automatic original conveying apparatus 20, in order to lift the reading unit 14, optical systems such as the plane mirrors 32 and 34 and the imaging lens 28 are used. The image information at the document reading position R can be read without adjusting and correcting the focal length.

  In addition, since the coil spring 64 is disposed between the connection bracket 40 and the receiving member 62, it is possible to absorb vibration during traveling of the reading unit 14 and read image information in a stable state.

  Next, the image forming apparatus 100 including the image reading apparatus 10 according to the second embodiment will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 6, in this embodiment, the end of the rail 80 is not provided with the stop rail 60 (see FIG. 1), and instead, on the side surface 15 </ b> B of the reading unit 14. Is provided with a cam 82 which is rotated by a motor 58 as a driving means. The edge 82A of the cam 82 travels along the upper surface of the rail 80, and when reading the original sheet material P on the platen glass 24, the longitudinal direction of the cam 82 is oriented horizontally. It has become. Further, when the original sheet material P sent to the original reading position R is read by the automatic original conveying apparatus 20, the longitudinal direction of the cam 82 is oriented in the vertical direction as shown in FIGS. As described above, the motor 56 rotates the cam 82 and lifts the reading unit 14.

  Thus, since the reading unit 14 can be lifted on the spot by rotating the cam 82, there is no need to provide a slope on the rail 80, and the image forming apparatus 100 can be downsized.

  Next, an image forming apparatus 100 including the image reading apparatus 10 according to the third embodiment will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 8 and 10, in this embodiment, the stop rail portion 60 (see FIG. 1) is not provided at the end of the rail 80, and the sheet is positioned below the document reading position R. An L-shaped lifting member 90 as viewed from the width direction of the material P is provided.

  The lifting member 90 is rotatably attached to the image reading apparatus main body 10A by a rotation shaft 90A, and a rotating arm 90B pressed against the front plate 15G of the reading unit 14 that has moved, The upper arm 90C is connected to the lower end portion, and is rotated together with the rotating arm 90B so as to contact the bottom plate 15H of the reading unit 14 and lift the reading unit 14.

  Specifically, as shown in FIG. 9B, the front plate 15G of the reading unit 14 that has been moved by the driving force of the driving pulley 70 (see FIG. 8) from the position where the original sheet material P on the platen glass 24 is read. Presses the rotating arm 90B of the lifting member 90. Thereby, the rotation arm 90B rotates in the arrow M direction around the rotation shaft 90A. As a result, the lifting arm 90C connected to the pivoting arm 90B also pivots in the direction of arrow M, and the tip of the lifting arm 90C hits the bottom plate 15H of the reading unit 14, as shown in FIG. 9A. Further, the lifting arm 90 </ b> C lifts the reading unit 14.

  When reading the original sheet material P on the platen glass 24, the lifting member 90 rotates in the reverse direction, and the reading unit 14 returns to its original height.

  In this way, since the reading unit 14 can be lifted using the rotational force of the endless belt, no dedicated driving means is required.

It is the perspective view which showed the reading unit, drive pulley, support rail, etc. which concern on 1st Embodiment of this invention. FIG. 2A is a side view showing the image reading apparatus according to the first embodiment of the present invention so that the inside of the reading unit can be seen. (B) The side view which showed the image reading apparatus which concerns on 1st Embodiment of this invention, and showed it so that the relationship between the side edge part of a reading unit and a rail could be understood. (A) It is the perspective view which showed the connection bracket etc. which concern on 1st Embodiment of this invention. (B) It is sectional drawing which showed the connection bracket etc. which concern on 1st Embodiment of this invention. FIG. 2A is a perspective view illustrating the image forming apparatus according to the first exemplary embodiment of the present invention in a state where a platen cover is closed. FIG. 2B is a perspective view illustrating the image forming apparatus according to the first exemplary embodiment of the present invention with the platen cover opened. 1 is a schematic configuration diagram illustrating an image forming apparatus according to a first embodiment of the present invention. It is the perspective view which showed the reading unit, drive pulley, support rail, etc. which concern on 2nd Embodiment of this invention. (A) It is the side view which showed the image reading apparatus which concerns on 2nd Embodiment of this invention, and showed it so that the inside of a reading unit could be seen. (B) It is the side view which showed the image reading apparatus which concerns on 2nd Embodiment of this invention, and showed so that the relationship between the side edge part of a reading unit and a rail could be understood. It is the perspective view which showed the reading unit, drive pulley, support rail, etc. which concern on 3rd Embodiment of this invention. (A) It is the side view which showed the reading unit which concerns on 3rd Embodiment of this invention, and showed the place where the reading unit contacted the rotation arm. (B) It is the side view which showed the reading unit which concerns on 3rd Embodiment of this invention, and showed the state by which the reading unit was lifted by the raising arm. (A) It is the side view which showed the image reading apparatus which concerns on 3rd Embodiment of this invention, and showed it so that the inside of a reading unit could be seen. (B) The side view which showed the image reading apparatus which concerns on 3rd Embodiment of this invention, and showed so that the relationship between the side edge part of a reading unit and a rail could be understood.

Explanation of symbols

10 Image reading device 14 Reading unit 15H Bottom plate (bottom surface)
20 Automatic document feeder (document feeder)
24 Platen glass (glass plate)
26 Platen cover (document pressing member)
36 Endless belt 40 Connection bracket (connection means)
58 Motor (drive means)
60 Stop rail 64 Coil spring (spring material)
66 Rotating roller (Rotating body)
68 Rail 70 Drive pulley 72 Driven pulley 80 Rail 82 Cam 90 Lifting member (lifting means)
90B Rotating arm 90C Lifting arm 100 Image forming apparatus

Claims (6)

A light transmission plate on which the document is placed;
A document pressing member that presses the document placed on the light transmission plate;
A document conveying device for conveying a document to a document reading position above the light transmission plate;
A reading unit for reading a document from the lower surface of the light transmission plate;
Moving means for moving the reading unit along the light transmitting plate;
Lifting means for lifting the light transmission plate toward the document reading position;
An image reading apparatus comprising: The moving means connects a driving pulley that is rotationally driven, a driven pulley rotatably provided, an endless belt wound around the driving pulley and the driven pulley, and the reading unit to the endless belt, A connecting means attached to the reading unit so as to be movable up and down, a rail arranged along a moving direction of the reading unit, and a rotating body attached to the reading unit and traveling on the rail. Prepared,
The image reading apparatus according to claim 1, wherein the lifting means is a stop rail portion formed at an end portion of the rail and bent toward the document reading position. The moving means connects a driving pulley that is rotationally driven, a driven pulley rotatably provided, an endless belt wound around the driving pulley and the driven pulley, and the reading unit to the endless belt, A connecting means attached to the reading unit so as to be movable up and down; a rail disposed along a moving direction of the reading unit; and a cam attached to the reading unit and traveling along the rail. Prepared,
The image reading apparatus according to claim 1, wherein the lifting unit is a driving unit that rotates the cam at the document reading position. The moving means connects a driving pulley that is rotationally driven, a driven pulley rotatably provided, an endless belt wound around the driving pulley and the driven pulley, and the reading unit to the endless belt, A connecting means attached to the reading unit so as to be movable up and down, a rail arranged along a moving direction of the reading unit, and a rotating body attached to the reading unit and traveling on the rail. Prepared,
The lifting means is rotated by being pressed by the reading unit that is moved by the moving means, and is rotated integrally with the rotating arm so as to hit the bottom surface of the reading unit. The image reading apparatus according to claim 1, further comprising a lifting arm that lifts.   The image reading apparatus according to claim 2, wherein the connecting unit is connected to the reading unit by a spring material.   An image forming apparatus comprising the image reading apparatus according to claim 1.

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