JP2007110658A - Paper sheet feeding apparatus and image reading position adjusting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper sheet feeding apparatus in which reading on the rear side of a paper sheet by a rear side reading sensor can be prevented from becoming oblique (read skew can be prevented), and image reading position adjusting method. <P>SOLUTION: When there is no parallelism between an image on the front side of a paper sheet and an image on the rear side thereof, another end portion 40B of the rear side image reading sensor 40 is moved along a long hole 46 to adjust an image reading position, so that image reading on the rear side of the paper sheet by the rear side image reading sensor 40 can be prevented from becoming oblique (read skew can be prevented). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sheet conveying apparatus (ADF) assembled in an image forming apparatus, and more particularly to a sheet conveying apparatus provided with a reading sensor (CIS sensor) that reads a back surface of a sheet and an image reading position adjusting method.

Among conventional image forming apparatuses, there is known an apparatus in which a sheet conveying device (ADF) having a back surface reading sensor (CIS sensor) for reading the back surface of a sheet is assembled. According to this image forming apparatus, the sheet is fed from the paper feed tray of the sheet conveying apparatus, the image on the surface of the sheet is read by the surface reading sensor provided on the image forming apparatus side, and the sheet conveying apparatus (ADF). After the image on the back side of the paper is read by the back side reading sensor provided on the paper, the paper is discharged to a paper discharge tray provided separately.
JP-A-5-30305 JP 2001-133906 A

  By the way, in the above image forming apparatus, the image printed on the back surface (reading surface) is inclined with respect to the image printed on the paper surface (reading surface) or is printed on the paper surface. Even if the image on the back side (reading surface) and the image printed on the back side (reading surface) are parallel, if the parts on the appearance transport device side such as a transport roll are distorted, the back side on the back side of the paper There is a problem that the reading by the reading sensor becomes oblique (occurrence of lead skew (inclination of paper during reading)).

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a sheet conveying apparatus and an image reading position adjusting method capable of preventing the reading by a back surface reading sensor on the back side of a sheet from being inclined (preventing lead skew). To do.

  The invention according to claim 1 is a paper transport device provided with a reading sensor for reading an image on the back side of the paper, and is provided with reading sensor moving means for adjusting the reading position by moving the reading sensor. And

  According to the first aspect of the invention, since the image reading position adjusting means is a reading sensor moving means for moving the reading sensor, the reading sensor itself can be moved in correspondence with the image on the paper. As a result, even when the image on the front side of the paper and the image on the back side are not parallel, reading of the image on the back side of the paper by the reading sensor can be easily prevented (read skew prevention). )it can. As a result, even when the image on the front surface and the image on the back surface of the paper do not have parallelism, the image read by the reading sensor can be printed on another paper in parallel to the paper piece without being inclined. .

  According to a second aspect of the present invention, in the paper conveying apparatus according to the first aspect, the reading sensor moving unit allows the reading sensor to rotate so as to be inclined with respect to a conveying direction of the paper. It is a tilting means.

  According to the second aspect of the present invention, the reading sensor moving means is a tilting means that allows the reading sensor to rotate so as to tilt with respect to the paper transport direction. Inclination movement with respect to the transport direction of the As a result, even when the image on the front side of the paper and the image on the back side are not parallel, the reading sensor can be moved in correspondence with the image on the paper, and the reading sensor reads the image on the back side of the paper. Can be easily prevented (lead skew can be prevented).

  According to a third aspect of the present invention, there is provided an image reading position adjusting method for a sheet conveying apparatus provided with a reading sensor for reading an image on the back side of a sheet, wherein the reading sensor is moved by a reading sensor moving means to move the back side of the sheet. The image is read.

  According to the third aspect of the invention, since the image reading position adjusting means is a reading sensor moving means for moving the reading sensor, the reading sensor itself can be moved in correspondence with the image on the paper. As a result, even when the image on the front side of the paper and the image on the back side are not parallel, reading of the image on the back side of the paper by the reading sensor can be easily prevented (read skew prevention). )it can. As a result, even when the image on the front surface and the image on the back surface of the paper do not have parallelism, the image read by the reading sensor can be printed on another paper in parallel to the paper piece without being inclined. .

  According to a fourth aspect of the present invention, in the image reading position adjusting method according to the third aspect of the invention, the reading sensor moving means rotates and moves so that the reading sensor is inclined with respect to the paper transport direction. The tilting means is allowed to read the image on the back side of the paper by tilting the reading sensor with respect to the paper transport direction.

  According to the fourth aspect of the present invention, the reading sensor moving means is an inclination means that allows the reading sensor to rotate so as to be inclined with respect to the paper transport direction. A tilting movement with respect to the sheet conveyance direction is allowed. As a result, even when the image on the front side of the paper and the image on the back side are not parallel, the reading sensor can be moved in correspondence with the image on the paper, and the reading sensor reads the image on the back side of the paper. Can be easily prevented (lead skew can be prevented).

  According to the present invention, it is possible to prevent the reading by the back side reading sensor on the back side of the sheet from being inclined (prevention of lead skew).

  Next, a sheet conveying apparatus and an image reading position adjusting method according to an embodiment of the present invention will be described with reference to the drawings. First, a schematic configuration in a state in which the sheet conveying device of the present invention is assembled to an image forming apparatus will be described.

  As shown in FIG. 1 and FIG. 2, the sheet conveying device (ADF) 10 is attached to the upper part of the image forming device 12. The image forming apparatus 12 is provided with a document table 14. An input unit 20 including a button 16 for inputting predetermined information and a liquid crystal display unit 18 for displaying predetermined information is attached to the document table 14. A platen glass (not shown) is attached to the upper surface of the document table 14. The document table 14 is provided with a light source unit (not shown) for irradiating light, a surface image reading sensor (not shown) for reading an image on the paper surface, and the like.

  A paper stock unit 22 is provided below the document table 14 of the image forming apparatus 12. In the paper stock unit 22, a plurality of paper cassettes 24 are arranged in which papers of different sizes are classified and accommodated. Further, on the upper surface of the paper stock unit 22, a discharge tray 26 is formed on which paper on which predetermined information that is fed out from the paper cassette and read or received in the copy mode or the facsimile mode is printed is discharged.

  As shown in FIGS. 1 and 2, the paper transport apparatus 10 is provided with a paper feed tray 28 on which paper is placed. A paper transport path 30 is formed inside the paper transport device 10. The sheet conveyance path 30 includes a first conveyance path 30A from the entrance of the sheet conveyance path 30 to a surface image reading portion A (see FIG. 2) from which an image on the surface of the sheet is read, and a surface image reading portion A (see FIG. 2). And a second conveyance path 30 </ b> B from the sheet conveyance path 30 to the exit of the sheet conveyance path 30. A paper feed roll 32 for guiding the paper in the paper feed tray 28 to the inside is disposed at the entrance of the paper transport path 30 of the paper transport device 10. A plurality of transport rolls 34 are arranged along the paper transport path 30 inside the paper transport device 10. Further, at the exit of the paper transport path 30 of the paper transport apparatus 10, a paper discharge roll 38 for guiding the paper transported through the paper transport path 30 to the paper discharge tray 36 is disposed.

  In addition, a back surface image reading sensor (CIS sensor, reading sensor) 40 that reads an image on the back surface of the paper is disposed in the back surface image reading portion B of the second transport path 30 </ b> B of the paper transport apparatus 10. Here, as shown in FIG. 3, the back surface image reading sensor 40 is configured in a rectangular shape, and both end portions thereof are attached to attachment portions 42 inside the sheet conveying apparatus 10 by screws 44 </ b> A and 44 </ b> B. Specifically, a circular through hole is formed in one end portion 40A of the back surface image reading sensor 40, and a long hole extending in the paper transport direction (the arrow X direction in FIG. 3) is formed in the other end portion 40B. 46, and the screws 44 </ b> A and 44 </ b> B pass through the through-hole and the long hole 46, respectively, and are screwed into the screw grooves formed in the attachment portion 42, so that the back surface image reading sensor 40 is attached to the attachment portion 42. It is attached. For this reason, the other end 40B of the back surface image reading sensor 40 can be rotated around the one screw 44A (in the direction of arrow S and arrow T in FIG. 3). Thereby, the back surface image reading sensor (CIS sensor) 40 can be rotationally moved so as to be inclined with respect to the paper transport direction (the arrow X direction in FIG. 3).

  Next, the operation of the sheet conveying apparatus 10 of this embodiment will be described.

  As shown in FIGS. 2 and 3, when the paper is faxed to a predetermined destination or when a copy is made, the paper on the paper feed tray 28 is transported by the paper feed roller 32 inside the paper transport device 10. It is supplied to the first conveyance path 30 </ b> A constituting the path 30. The sheet supplied to the first transport path 30A is transported through the first transport path 30A by the transport roller 34. The sheet conveyed through the first conveyance path 30A is read by the surface image reading portion A, and the image on the sheet surface is read by a surface image reading sensor (not shown).

  The sheet on which the image on the sheet surface is read by the surface image reading sensor (not shown) at the surface image reading portion A is conveyed by the conveyance roller 34 in the second conveyance path 30B constituting the sheet conveyance path 30. Then, in the back surface image reading unit B, the back surface image of the paper is read by the back surface image reading sensor (CIS sensor) 40. The paper on which the back image is read by the back image reading sensor (CIS sensor) 40 is conveyed as it is in the second conveyance path 30B, and is discharged to the discharge tray 36 by the discharge roller 38.

  Here, as shown in FIG. 3, since the dimensional accuracy of each transport roller 34 and the printing accuracy of the image printed on the paper are poor, the image printed on the front surface of the paper and the image printed on the back surface are parallel. If not, the back end image reading sensor (CIS sensor) 40 is rotated by rotating the other end 40B of the back side image reading sensor (CIS sensor) 40 in the direction of arrow S or T in FIG. Can be inclined with respect to the paper transport direction (the direction of arrow X in FIG. 3). Thereby, the back surface image reading sensor (CIS sensor) 40 can be moved so as to be parallel to the back surface image of the sheet, and the reading of the image on the back surface of the sheet by the back surface image reading sensor (CIS sensor) 40 becomes oblique. Can be prevented (preventing lead skew). As a result, the image read by the back surface image reading sensor (CIS sensor) 40 can be printed on another paper in parallel with the paper piece without being inclined.

  When the back surface image reading sensor (CIS sensor) 40 is moved so as to be inclined with respect to the sheet conveyance direction (the direction of arrow X in FIG. 3), the screw groove of the screw 44B penetrating the long hole 46 is used. The back side image reading sensor (CIS sensor) 40 is easily rotated by pressing the other end 40B of the back side image reading sensor (CIS sensor) 40 with a tool (not shown) as a separate member. Can be moved.

  Moreover, in the paper conveying apparatus 10 of the said embodiment, although the structure which formed the long hole 46 in the other edge part 40B side of the back surface image reading sensor (CIS sensor) 40 was shown, for example, a back surface image reading sensor (CIS sensor) ) A similar long hole (not shown) is also formed on one end 40A side of 40, and one end 40A of the back surface image reading sensor (CIS sensor) 40 is also a long hole in the same manner as the other end 40B. You may enable it to rotate along.

1 is a perspective view of an image forming apparatus in which a paper conveyance device according to an embodiment of the present invention is assembled. FIG. 2 is a schematic configuration diagram of the inside of a sheet conveying device according to an embodiment of the present invention. It is explanatory drawing of the principal part of the paper conveying apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

10 Paper transport device 40 Back side image reading sensor (reading sensor)
44B screw (image reading position adjusting means, reading sensor moving means, tilting means)
46 long hole (image reading position adjusting means, reading sensor moving means, tilting means)

Claims (4)

A paper transport device having a reading sensor for reading an image on the back side of paper,
A sheet transporting apparatus, comprising: a reading sensor moving unit that adjusts a reading position by moving the reading sensor.   2. The paper transporting apparatus according to claim 1, wherein the reading sensor moving unit is a tilting unit that allows the reading sensor to rotate so as to tilt with respect to a transporting direction of the paper. An image reading position adjusting method for a sheet conveying device provided with a reading sensor for reading an image on the back side of a sheet,
An image reading position adjusting method, wherein the reading sensor is moved by a reading sensor moving means to read an image on the back side of the paper. The reading sensor moving unit is a tilting unit that allows the reading sensor to rotate so as to tilt with respect to the paper transport direction, and the tilting unit moves the read sensor with respect to the paper transport direction. 4. The image reading position adjusting method according to claim 3, wherein the image on the back surface of the paper is read by being inclined.

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