JP2008124582A - Document conveying apparatus, image reading apparatus, and image forming apparatus - Google Patents

Abstract

A document conveying device capable of easily and surely removing a jammed document while suppressing sticking of the jammed document to the apparatus main body side, an image reading apparatus using the same, and an image forming apparatus are provided.
An original as a part of a lower paper feed guide plate 7 intersects with an upper paper feed guide plate 27 between a pull-out roller 12a and an intermediate roller 13a so as to intersect a transport path 29 for transporting a document 26 in the direction of arrow B. A conveyance guide portion 23 serving as a guide is provided. When a jam occurs in the transport path 29 and the document 26 is jammed in the transport path 29, the main body cover 22 is rotated when the main body cover 22 is rotated upward to open the transport path 29. Accordingly, the conveyance guide unit 23 is also rotated, and the document 26 is held by the holding unit 23c of the conveyance guide unit 23 and lifted upward.
[Selection] Figure 4

Description

  The present invention relates to an original conveying apparatus, an image reading apparatus, and an image forming apparatus.

Conventionally, in an image reading apparatus applied to a copying machine, a facsimile machine, a scanner device, etc., in order to read an image described on a document by separating the documents one by one from a document bundle and transporting them to a reading position. A plurality of pairs of conveyance units that convey a document placed on a document table toward a reading position, the conveyance units face each other across a document conveyance path, and convey documents in the document conveyance direction. An original conveying apparatus having means is used.
In this document transport device, when a document transported from the document mounting table is jammed in the transport path and a so-called jam occurs, one of the transporting means is arranged in the device body in order to easily remove the jammed document. The other of the conveying means is disposed on the main body cover, and the main body cover has a structure that can be opened and closed with respect to the apparatus main body so that the conveying means is exposed and closed to the outside, and a jam occurs. When this occurs, the main body cover is opened to easily remove the jammed document sandwiched between the conveying means and the like (see, for example, Patent Document 1).
JP 2003-121947 A

However, in the document described in Japanese Patent Application Laid-Open No. H10-228707, the jammed document can be appropriately removed in the document conveying device of the type that conveys the document linearly. However, when the main body cover is opened, there is a problem that when the main body cover is opened, the original document sticks to the apparatus main body side and it is difficult to remove the jammed original document.
The present invention has been made in view of the above circumstances, and an original conveying apparatus that can easily and reliably remove jammed originals by suppressing sticking of jammed originals to the apparatus main body side, and uses the same. An object of the present invention is to provide an image reading apparatus and an image forming apparatus.

In order to solve the above-mentioned problems, the invention described in claim 1 includes a transport unit that transports a document placed on a document table toward a reading position, and the transport unit sandwiches a document transport path. It has at least a pair of conveying means that face each other and convey the originals in the original conveying direction. One of the conveying means is arranged in the apparatus main body, the other of the conveying means is arranged in the main body cover, The main body cover is provided with an original guide means adjacent to the conveying means attached to the main body cover in the original conveying apparatus provided to be openable and closable with respect to the apparatus main body so as to expose and close the conveying means to the outside. The guide means has a holding means for holding the original document being conveyed when the main body cover is opened.
According to a second aspect of the present invention, in the document conveying apparatus according to the first aspect, a plurality of the guide means are provided at intervals.

According to a third aspect of the present invention, in the document conveying apparatus according to the first or second aspect, the guide means is detachably attached to the main body cover.
According to a fourth aspect of the present invention, in the document conveying device according to any one of the first to third aspects, the guide member is open on one side in a direction orthogonal to the document conveying direction. Features.
Further, the invention of claim 5 has a conveying means for conveying the document set on the document placing table toward the reading position, the conveying means are opposed to each other across the document conveying path, and the document conveying direction is mutually opposed. At least a pair of conveying means, one of the conveying means is disposed in the apparatus main body, the other of the conveying means is disposed in the main body cover, and the main body cover includes the conveying means. In the image reading apparatus, comprising: an original conveying means provided to be openable and closable with respect to the apparatus main body so as to be exposed and closed to the outside; and an image reading means for reading an image described on the original; Is a document feeder according to any one of claims 1 to 4.
According to a sixth aspect of the present invention, there is provided an image forming apparatus comprising the image reading device according to the fifth aspect.

  According to the present invention, by adopting the above-described configuration, it is possible to suppress the jamming of the jam original on the apparatus main body side, and to easily and reliably remove the jam original and an image using the same. A reading device as well as an image forming apparatus can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of an image reading apparatus according to an embodiment of the present invention. The image reading apparatus includes a document conveying unit 24 and an image reading unit 25. The image reading unit 25 reflects the reflected light of the light emitted from the lamp 31 at the reading position 17 by a mirror 32, and the CCD 33. To read the image on the original.
On the other hand, the document transport unit 24 has a U-shaped transport path 29 formed by the document table 2 and the upper and lower guide plates 7 and 27, and rotates so that the document is transported in the transport path 29. Conveying means comprising a plurality of pairs of conveying rollers such as driven pull-out rollers 12a and 12b, intermediate rollers 13a and 13b, reading inlet rollers 14a and 14b, reading outlet rollers 18a and 18b, and discharge rollers 20a and 20b are provided. .

In the document transport unit 24, the document is set on the document placing table 2, and then the document is placed on the document placing table 2 by the pickup roller 6, the feeding roller 10 suspended on the driving roller 10 a and the driven roller 10 b, and the reverse roller 9. The uppermost original is separated from the original bundle placed on the paper, and paper feeding is started. The separated document is conveyed in the conveying path 29 by the conveying means, and the image is read at the reading position 17, and then discharged onto the paper discharge tray 21.
The document transport unit 24 includes a document table 1 that supports a large-sized document, a document back guide 3 that guides the sides of the document, a document set sensor 4, a document set filler 5, an abutment sensor 11, and a registration sensor 15. It is possible to detect whether the document is properly set and conveyed.

The document transport unit 24 is configured to remove a jammed document from the transport path 29 when a document jam occurs during paper feeding or document reading. A main body cover 22 that can be partially separated vertically, attaches one of a plurality of separable conveying means and guide plates to the apparatus main body 30, and protects the document conveying portion 24 with the other of the separable conveying means and guide plates. Is attached. Then, the main body cover 22 is rotatably attached on a pivot 28 attached to the apparatus main body 30. When a document jam occurs, the main body cover 2 is rotated to separate and open a part of the conveyance path 29 vertically. Thus, the jam original can be easily taken out.
That is, the apparatus main body 30 includes a reverse roller 9, a pull-out roller 12b, an intermediate roller 13b, reading inlet rollers 14a and 14b, a reading roller 16, reading outlet rollers 18a and 18b, discharge rollers 20a and 20ba, and a lower paper feed guide plate. 7 is mounted with these positions fixed. On the other hand, the body cover 22 is attached with a paper feed belt 10, a pull-out roller 12a, an intermediate roller 13a, and an upper paper feed guide plate 27 suspended from the driving roller 10a and the driven roller 10b. As shown, when the pivot cover 28 is pivotally mounted in the direction of arrow A, the pull-out rollers 12a and 12b and the intermediate rollers 13a and 13b are exposed to the outside when the main body cover 22 is rotated upward and opened. It has come to be. Accordingly, it is possible to easily take out the jammed document sandwiched in the conveyance path 29 by opening the main body cover 22.

  The conventional document transport unit has the above-described configuration. However, when the main body cover 22 is rotated upward to be opened, the document sticks to the lower paper feed guide plate 7 to remove the document. There were cases where it could not be done properly. In the present invention, in order to improve this point, the upper sheet feed guide plate 27 between the pull-out roller 12a and the intermediate roller 13a crosses the conveyance path 29 that conveys the document 26 in the direction of the arrow B and lowers the sheet. A conveyance guide portion 23 serving as a document guide is provided as a part of the paper guide plate 7. As shown in FIG. 3, the conveyance guide portion 23 has a U-shaped cross section, and includes a holding portion 23 c that connects the upper ends of the left and right (both ends in the width direction) side walls 23 a and 23 b. A penetrating portion 23d through which an original can be inserted is provided in an area surrounded by 23b and the holding portion 23c. The penetration part 23d penetrates in the transport direction. Therefore, as shown in FIG. 4A, when the main body cover 22 is closed and the document 26 is conveyed from the document table 2, the document 26 travels through the through portion 23 d of the conveyance guide unit 23. In other words, the upper surface, the side, and the lower surface of the document 26 are guided by the conveyance guide unit 23. In this case, in order to smoothly convey the document 26, the holding portion 23c faces the conveyance guide portion 23 of the lower paper feed guide plate 7 so that the inner surface of the holding portion 23c is flush with the surface of the lower paper feed guide plate 7. A concave portion 7a is formed in the portion to be formed, and the holding portion 23c is immersed in the concave portion 7a.

  On the other hand, when a jam occurs in the transport path 29 and the document 26 is jammed in the transport path 29, the main body cover 22 is rotated upward as shown in FIG. When the body cover 22 is opened, the conveyance guide portion 23 is also retracted upward along with the rotation of the main body cover 22, and the document 26 is held by the holding portion 23 c of the conveyance guide portion 23 and lifted upward. Accordingly, it is possible to easily and reliably remove the jammed document 26 from the conveyance path 29 by gripping the raised portion. In this case, in the present embodiment, the holding portion 23c of the conveyance guide portion 23 is formed in a connecting plate shape connected to the upper ends of the side walls 23a and 23b, but it is not necessary to connect to the side walls 23a and 23b. The intermediate portion of the connecting plate is removed to form two unconnected L-shaped transport guide portions 23, and the document 26 is held by the two holding portions 23c bent from the upper ends of the side walls 23a, 23b. You can also.

  Further, the transport guide portion 23 is formed integrally with the upper paper feed guide plate 27, but it is not necessarily formed integrally, and is formed separately, and the lower ends of the side walls 23a and 23b of the transport guide portion 23 are arranged on the upper side. The conveyance guide unit 23 can be detachable from the upper paper feed guide plate 27 as necessary, for example, when the upper paper feed guide plate 27 is cleaned, or the like. As described above, the conveyance guide portion 23 is configured to be detachable from the upper paper feed guide plate 27, so that maintenance and inspection can be easily performed such as easy cleaning of paper dust generated from the original. There are advantages that can be made.

  FIG. 5 is a diagram showing a schematic configuration of a document conveying unit according to another embodiment of the present invention. In FIG. 5, the same components as those in FIG. In the present embodiment, the above-described first embodiment is improved and a conveyance guide portion is provided between the pull-out roller 12a and the intermediate roller 13a, and the rear side of the paper feed belt 10, the pull-out roller 12a, and the intermediate roller 13a. It is provided in three neighboring locations 231, 232, 233. As described above, when the transport guides 231, 232, and 233 are provided at a plurality of positions at intervals, it is possible to remove a jammed document from a document having a large document size to a document having a small document size. Even if this occurs, there is an advantage that it can be held by any one of the conveyance guide portions 231, 232 and 233 at a plurality of locations.

  FIG. 6 is a diagram showing a schematic configuration of a document conveying unit according to another embodiment of the present invention. In this embodiment, it is possible to remove one of the side walls 23a and 23b of the conveyance guide portion 23 shown in FIG. 1 and move the document in a direction C perpendicular to the conveyance direction B by opening one side. Is. In this way, since the jam document take-out direction is two directions, there is an advantage that the jam document can be removed smoothly.

FIG. 7 is a diagram illustrating an overall configuration of a tandem intermediate transfer type full-color copying machine to which the image reading apparatus according to the first embodiment is applied.
The full-color copying machine according to the present embodiment includes an image forming unit main body 100, a paper feed table unit 200 on which the image forming unit main body 100 is placed, a scanner 300 attached on the image forming unit main body 100, and an automatic document feeder attached on the scanner 300. (ADF) 400 or the like. In the ADF 400, the document conveying unit 24 of the image reading apparatus shown in the first embodiment is applied.

  In the center of the apparatus main body 100, four color image forming units 101Y, 101C, 101M, and 101Bk of yellow (Y), cyan (C), magenta (M), and black (Bk) are arranged side by side and arranged in a tandem image. A forming apparatus is configured. Each of the image forming units 101Y, 101C, and 101M of the tandem image forming apparatus 20 includes a photoreceptor 40 on which Y, C, M, and Bk toner images are formed. An exposure device 21 is provided above the image forming units 101Y, 101C, 101M, and 101Bk. The exposure device 21 forms an electrostatic latent image on the photoconductor 40 by irradiating the color photoconductor 40 with laser light for each color obtained by optically modulating the image information of the original read by the scanner 300 by a polygon scanner. The electrostatic latent image on the photoconductor 40 is visualized by a developing device attached around the photoconductor 40 to form a toner image.

An endless belt-like intermediate transfer belt 102 is installed below the image forming units 101Y, 101C, 101M, and 101Bk. The intermediate transfer belt 10 transfers the toner image from the photosensitive member 40 of each color to the intermediate transfer belt 102. A secondary transfer device 103 is provided below the intermediate transfer belt 102. The secondary transfer device 103 transfers the image on the intermediate transfer belt 102 to a recording medium 104 such as recording paper. A fixing device 105 for fixing an image on the recording medium 104 is provided beside the secondary transfer device 22, and the image on the recording medium 104 after the image transfer is fixed by the fixing device 105.
Since the image reading apparatus of the first embodiment described above is applied to this full-color copying machine, even if a jam occurs during the conveyance of the original, the cover 22 is rotated to open the conveyance path 29 to remove the jam original. Can be removed appropriately.

  In the above embodiment, an example in which the image reading apparatus is applied to a copying machine has been described. However, the present invention can also be applied to other image forming apparatuses such as facsimiles.

1 is a cross-sectional view illustrating a schematic configuration of an image reading apparatus according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view illustrating a schematic configuration of a document conveying unit according to the first exemplary embodiment of the present invention when a main body cover is opened. It is a perspective view of the main body cover which concerns on Example 1 by this invention. 2A and 2B are cross-sectional views of a document conveying unit according to the first exemplary embodiment of the present invention, in which FIG. 1A is a cross-sectional view when a main body cover is closed, and FIG. It is sectional drawing of the original conveyance part at the time of opening the main body cover based on Example 2 by this invention. It is a perspective view of the main body cover which concerns on Example 3 by this invention. It is sectional drawing which shows the whole structure of the copying machine based on Example 4 by this invention.

Explanation of symbols

2 Document Placement Table 6 Pickup Roller 7 Lower Feed Guide Plate 9 Reverse Roller 10 Feed Belt 12a, 12b Pull-out Roller 13a, 13b Intermediate Roller 14a, 14b Reading Entrance Roller 16 Reading Roller 17 Reading Position 18a, 18b Reading Exit Roller 20a, 20b Paper discharge roller 22 Main body cover 23 Transport guides 23a, 23b Side walls 23c Holding unit 23d Penetration unit 24 Document transport unit 25 Image reading unit 27 Upper paper feed guide plate 27a Recess 28 Axis 29 Transport path 30 Device body 31 Lamp 32 Mirror 33 CCD
40 Photosensitive member 100 Image forming unit main body 101Y, 101C, 101M, 101Bk Image forming unit 102 Transfer belt 103 Secondary transfer unit 104 Recording medium 105 Fixing device

Claims (6)

A transport unit configured to transport the document placed on the document table toward the reading position, the transport unit facing each other across the transport path of the document and transporting the document in the document transport direction to each other; Having a conveying means, one of the conveying means is disposed in the apparatus main body, the other of the conveying means is disposed in the main body cover, and the main body cover is configured to expose and close the conveying means to the outside. In the document conveying apparatus provided to be openable and closable with respect to the apparatus main body,
Document conveying means is provided adjacent to the conveying means attached to the main body cover, and the guiding means has holding means for holding the original document in the middle of conveyance when the main body cover is opened. apparatus. The document feeder according to claim 1,
A document conveying apparatus, wherein a plurality of the guide means are provided at intervals. In the document conveying device according to claim 1 or 2,
The document conveying apparatus, wherein the guide means is detachably attached to the main body cover. The document feeder according to any one of claims 1 to 3,
The document conveying apparatus according to claim 1, wherein the guide member is open on one side in a direction orthogonal to the document conveying direction. A transport unit configured to transport the document placed on the document table toward the reading position, the transport unit facing each other across the transport path of the document and transporting the document in the document transport direction to each other; Having a conveying means, one of the conveying means is disposed in the apparatus main body, the other of the conveying means is disposed in the main body cover, and the main body cover is configured to expose and close the conveying means to the outside. In an image reading apparatus comprising a document conveying means provided to be openable and closable with respect to the apparatus main body, and an image reading means for reading an image described on the document,
The image reading apparatus according to claim 1, wherein the document conveying unit is the document conveying device according to claim 1.   An image forming apparatus comprising the image reading device according to claim 5.

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