JP2009051639A - Document carrying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a document carrying device capable of accurately reading a document, and capable of excellently ejecting and stacking the read document. <P>SOLUTION: This document carrying device is provided with a sheet-like paper ejection assisting member 90 curving by contacting with the document 1 when the document 1 is sandwiched between a downstream side carrier roller shaft 14a or a downstream side driven roller shaft 24a, and between a downstream side carrier roller 14 and a downstream side driven roller 24 and restoring so as to push out the rear end of the document 1 to the downstream side in the document carrying direction when the document 1 slips out of the downstream side carrier roller 14 and the downstream side driven roller 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a document conveying device, and more particularly to a document conveying device that reads an image with a reading unit while moving a document by a conveying roller.

  In general, in a so-called sheet-through type document conveying apparatus in which a reading unit is fixed and an image is read while moving a document, the document is conveyed and stacked on a paper discharge tray in order to simplify the configuration and reduce the cost. In some cases, the paper discharge roller to be used is omitted, and the downstream side conveyance roller provided on the downstream side in the document conveyance direction of the reading unit is used as the paper discharge roller.

  Conventionally, this type of document conveying device has a cam-shaped discharge auxiliary roller having a portion larger in diameter than the discharge roller, and the discharge end roller pushes the rear end of the document to the discharge tray. Is known that assists in transporting the original document (see, for example, Patent Document 1).

Also known is a pair of rubber rollers having different hardnesses, in which the originals sandwiched by the rubber roller pair are deflected by the bending of the lower hardness rubber rollers so that the originals are stacked in an orderly manner on the paper discharge tray. (For example, refer to Patent Document 2).
Japanese Patent Laying-Open No. 2005-187084 Japanese Patent Laid-Open No. 2002-87774

  However, in the conventional document conveying apparatus as described above, since the discharge assisting roller has a cam shape, the document conveying speed is not constant, and the document is wavy. There was a problem that quality deteriorated.

  In addition, since the original is sandwiched between a pair of rubber rollers having different hardnesses, the conveyance speed of the original changes due to the bending of the lower-hardness rubber roller, or dirt adheres to the original due to the contact pressure of the higher-hardness rubber roller. There was a problem of doing.

  The present invention has been made to solve the above-described conventional problems, and provides a document conveying device that can accurately read a document and can discharge and stack the document after reading well. With the goal.

  An original conveying apparatus according to the present invention includes a reading unit that reads an original, an upstream conveying roller pair that is provided upstream of the reading unit in the original conveying direction, sandwiches the original and conveys the original to the reading unit, and the reading In the document conveying apparatus, the downstream conveying roller provided on the downstream side of the document conveying direction, and provided with a pair of downstream conveying rollers that sandwich the document read by the reading unit and convey the document on a paper discharge tray When the original is sandwiched between the pair of downstream conveying rollers on the roller shaft of at least one roller of the pair, the original comes into contact with the original and curves, and when the original comes off from the pair of downstream conveying rollers A sheet-like discharge assisting member for restoring the rear end of the original so as to push it downstream in the original conveying direction is provided.

  With this configuration, even if the discharge assisting member comes into contact with the document, the discharge assisting member is curved so that the speed of the downstream conveyance roller pair does not change, and when the document comes out of the downstream conveyance roller pair, Since the discharge assisting member is restored and the trailing edge of the document is pushed downstream in the document conveyance direction, the document can be read with high accuracy, and the read document can be discharged and stacked satisfactorily.

  The document conveying device according to the present invention is characterized in that the discharge assisting member is provided on a roller shaft of a roller in contact with the back surface of the document of the pair of downstream conveying rollers.

  With this configuration, the discharge assisting member comes into contact with the back side of the document, and the surface to be read can be prevented from being soiled.

  Further, the document conveying apparatus according to the present invention is characterized in that the discharge assisting member is composed of a member having antifouling property.

  With this configuration, it is possible to prevent dirt from adhering to the paper discharge assisting member and from being transferred from the paper discharge assisting member to the document.

  In addition, a document conveying device according to the present invention includes a reading unit that reads a document, an upstream conveyance roller pair that is provided on the upstream side of the reading unit in the document conveying direction, and sandwiches the document and conveys the document to the reading unit. In the document conveying apparatus provided on the downstream side in the document conveying direction of the reading unit, and comprising a pair of downstream conveying rollers that sandwich the document read by the reading unit and convey the document on a paper discharge tray, the downstream side The roller shaft of at least one roller of the conveying roller pair rotates together with the roller shaft when not in contact with the document, and when the document is in contact with the document, the rotation is stopped by the document and the downstream side A discharge assisting member is provided that pushes the trailing edge of the document that has come out of the pair of conveyance rollers to the downstream side in the document conveyance direction.

  With this configuration, the rotation of the downstream conveying roller pair does not change when the discharge assisting member is in contact with the document, and when the document comes out of the downstream conveying roller pair, the trailing edge of the document is discharged. Since the auxiliary member can be pushed out downstream in the document conveying direction and conveyed onto the sheet discharge tray, the document can be read with high accuracy, and the read document can be discharged and stacked satisfactorily.

  Further, in the document conveying device according to the present invention, the discharge assisting member is formed of a member having antifouling property, and is provided on a roller shaft of a roller in contact with the surface of the document of the pair of downstream conveying rollers. It is characterized by that.

  With this configuration, it is possible to prevent the surface of the original to be read from becoming dirty.

  The document conveying device according to the present invention is characterized in that the discharge assisting member is provided at a substantially central portion in the axial direction of the roller shaft.

  With this configuration, since the central portion in the width direction can be always pushed by the discharge assisting member regardless of the size of the document, the document after reading can be discharged and stacked satisfactorily regardless of the size of the document. be able to.

  The document conveying device according to the present invention is characterized in that a plurality of the paper discharge assisting members are provided at positions symmetrical with respect to both end directions of the roller shaft about the substantially central portion in the axial direction of the roller shaft. .

  With this configuration, even when the original is wide, such as A0 size, the read originals can be discharged and stacked satisfactorily by the plurality of discharge assisting members.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to read a document accurately, the document conveying apparatus which can discharge | emit and stack | stack the document after reading satisfactorily can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view showing a configuration of a document conveying device according to a first embodiment of the present invention.

  First, the configuration will be described.

  The document transport device 11 transports the sheet-shaped document 1 to the reading unit 17 and sets an operation mode (rear discharge mode / front discharge mode) set in advance according to the thickness (stiffness of the document) 1. Accordingly, the document 1 after reading is conveyed in the direction indicated by the arrow a and discharged to the first document discharge tray 26 at the rear (rear side) of the apparatus, or the document 1 after reversing the reading is indicated by the arrow b. To the second document discharge tray 12 in front of the apparatus (front side). Here, the front side of the apparatus (front side) is the side on which the display screen of the operation display unit 51 is facing, and the rear side of the apparatus (back side) is the side opposite to the direction of the display screen of the operation display unit 51, that is, This is the side of the first document discharge tray 26 that discharges the document 1 in the rear discharge mode.

  The document feeder 11 includes an upper unit 20 and a lower unit 21 connected by a connecting member such as a hinge (not shown). The upper unit 20 is connected to the lower unit 21 by a connecting member so as to be opened and closed in the vertical direction. On the upper part of the upper unit 20, an operation display unit 51 and a second document discharge tray 12 are mounted facing the front of the apparatus.

  The second document discharge tray 12 is composed of a metal wire formed in a comb-teeth shape. The second document discharge tray 12 is inclined at the upper part of the upper unit 20 from the rear of the apparatus toward the front of the apparatus, and is inverted and discharged. Are accommodated so as to be removable from the front of the apparatus.

  The operation display unit 51 includes a key group (not shown) such as a start key, a numeric keypad, a clear / stop key, an initial setting key, and a mode key, and a liquid crystal touch panel. It is configured as possible. In addition, the liquid crystal touch panel displays a message indicating the number of copies, device status, and the like, and appropriately displays function keys according to the device status.

  The reading unit 17 includes a mirror (not shown), a light source, an imaging lens, a shading plate, a contact image sensor (CIS), and the like, and irradiates light from above the conveyance path to the document 1 inserted and conveyed from the front of the apparatus. The reflected light is imaged on a light receiving surface of a contact image sensor (CIS) through a mirror and an imaging lens, and the image surface is sequentially converted into an image signal (image data). In the reading unit 17 using the contact image sensor, in order to obtain a high-quality read image, the conveyance speed of the document 1 is kept constant and the distance between the reading unit 17 and the document 1 is kept constant. is important. A white backup roller 16 that is rotationally driven in the document transport direction is provided below the reading unit 17.

  A branching claw (not shown) is provided in the vicinity of the downstream side conveyance roller 14, that is, between the downstream side conveyance roller 14 and the first document discharge tray 26, in the vicinity of the downstream side conveyance roller 14. In the paper discharge mode, the document 1 after reading is guided to the second document discharge tray 12 side, and in the rear paper discharge mode, the document 1 after reading is guided to the first document discharge tray 26 side. Yes. The branch claw is driven by a suction operation and a release operation of a solenoid mechanism (not shown) based on a preset operation mode.

  On the other hand, a document table 25 is disposed on the front upper surface of the lower unit 21, and a first document discharge tray 26 is protruded and attached to the rear rear surface of the lower unit 21. The document table 25 is for placing the document 1 with the reading surface facing upward, and guides the placed document 1 to the holding portion between the upstream side conveyance roller 13 and the upstream side driven roller 23. It has become.

  In the vicinity of the upstream side of the reading unit 17, a registration sensor 18 that is an optical reflection type sensor is disposed. The registration sensor 18 detects the leading edge of the document 1 and turns on, and turns off after the trailing edge of the document 1 passes. The branch claw restoration process and the conveyance motor 43 stop process in the rear paper discharge mode are performed based on the timing at which the registration sensor 18 detects the trailing edge of the document 1.

  A size detection sensor 22 is provided at the entrance of the document conveyance path of the document conveyance device 11, that is, in the vicinity of the upstream side of the upstream conveyance roller 13, and the size detection sensor 22 detects the size of the document 1. The presence / absence of insertion of the document 1 into the transport path is detected.

  The first document discharge tray 26 is composed of a metal wire formed in a comb-teeth shape, is gently inclined so as to become higher toward the downstream in the transport direction, and extends from the downstream transport roller 14 in the extended state. The document 1 discharged rearward is stored.

  On the upstream side of the reading unit 17 in the conveyance direction, an upstream conveyance roller 13 and an upstream driven roller 23 that is driven in pressure contact with the upstream conveyance roller 13 are provided. Further, on the downstream side in the conveyance direction of the reading unit 17, a downstream conveyance roller 14 and a downstream driven roller 24 that is driven in pressure contact with the downstream conveyance roller 14 are provided. The downstream transport rollers 14 are made of fluorine-based rubber, and a plurality of downstream transport rollers 14 are arranged in the axial direction of the downstream transport roller shaft 14a (see FIG. 5) made of metal. Further, the upstream side conveyance roller 13 is configured in the same manner as the downstream side conveyance roller 14. The downstream driven roller 24 is made of foam rubber, and a plurality of downstream driven rollers 24 are arranged in the axial direction of the downstream driven roller shaft 24a (see FIG. 5) made of metal. Further, the upstream driven roller 23 is configured similarly to the downstream driven roller 24. The upstream driven roller 23 and the downstream driven roller 24 are pressed against the upstream transport roller 13 and the downstream transport roller 14 by springs (not shown), respectively.

  The upstream side conveyance roller 13 and the downstream side conveyance roller 14 are driven by a stepping motor (not shown) via a drive transmission means having a timing belt. The upstream conveying roller 13 is driven and controlled via an electromagnetic brake / clutch (not shown). The electromagnetic brake / clutch is coupled by a document insertion detection signal to transmit the drive from the stepping motor, and the document 1 Until the trailing edge of the document 1 passes from the size of the size detection sensor 22 until the trailing edge of the document 1 passes through the downstream conveyance roller 14, the preceding document is discharged from the document conveying device 11. Until then, the next original cannot enter the original conveying apparatus 11.

  An image forming apparatus main body 19 is disposed below the document conveying device 11, and the image forming apparatus main body 19 includes a paper feed unit 82 that stores roll transfer paper 78, 79, 80, and roll transfer paper 78, 79 and 80 are provided with an image forming unit 81 for forming an image.

  The image forming unit 81 includes a drum-shaped photosensitive member 33, and the charger 33, the writing unit 30, the developing unit 32, the transfer charger 36, the separation charger 37, and the like in the order of the electrophotographic process centering on the photosensitive member 33. It has. The writing unit 30 constitutes a laser writing optical system including a laser output unit (including a laser diode and a polygon mirror), an imaging lens, and a mirror. Further, a fixing roller 35, a pressure roller 34, paper discharge roller pairs 38 and 39, and paper discharge trays 40 and 41 are provided downstream of the transfer position of the photoconductor 33 in the transport direction.

  A paper feed unit 82 for storing roll transfer paper 78, 79, 80 is provided at the lower part in the image forming unit 81, and the roll transfer paper 78, 79, 80 is attached to and detached from the image forming apparatus main body 19. Each is stored freely. The roll transfer sheets 78, 79, 80 are cut according to the length of the original by the cutters 76, 77 and conveyed to the transfer position side of the photoconductor 33 by the pair of paper feed rollers 71-75.

  As a result, the roll transfer paper 78, 79, 80 is selected / cut according to the original length detected on the original conveying device 11 side, and is conveyed to the transfer position of the photosensitive member 33 by the pair of paper feed rollers 71-75. . On the other hand, on the photoreceptor 33 that is rotationally driven in the sub-scanning direction, an electrostatic latent image is formed by the writing unit 30 and a toner image is formed by the developing unit 32. The cut transfer paper transported by the pair of paper feed rollers 71 to 75 is transported by the registration roller pair 70 and a transport belt (not shown) while being synchronized with the front end of the toner image on the photoconductor 33 to transfer the toner image. receive. The transfer paper after the transfer is subjected to fixing processing by the fixing roller 35 and the pressure roller 34 and then discharged onto the paper discharge trays 40 and 41 via the paper discharge roller pairs 38 and 39 according to the size of the transfer paper. .

  FIG. 2 is a perspective view showing a configuration of a discharge assisting member of the document conveying device according to the first embodiment of the present invention. FIG. 3 is a side view of the downstream side conveyance roller to which the discharge assisting member of the document conveyance device according to the first embodiment of the present invention is attached. FIG. 4 is a front view showing the downstream side transport roller of the document transport apparatus according to the first embodiment of the present invention.

  As shown in FIGS. 2 and 3, a discharge assisting member 90 is attached to the downstream side transport roller shaft 14a. The paper discharge assisting member 90 is composed of a sheet-like resin film having elasticity and a fluorine-based resin coating for improving the antifouling property. For this reason, pencil graphite or the like on the document 1 is difficult to adhere to the discharge assisting member 90. As a resin film constituting the discharge assisting member 90, for example, Toray Lumirror S10 having a thickness of 0.188 mm is suitable.

  The discharge assisting member 90 includes a mounting portion 92 that is curled so as to be wound around the downstream side transport roller shaft 14a, and a substantially linear contact portion 91 that contacts the document 1 to be discharged. The inner diameter of the curled attachment portion 92 is slightly smaller than the diameter of the downstream side conveyance roller shaft 14a. For this reason, when the paper discharge assisting member 90 is attached to the downstream side conveyance roller shaft 14a, the attachment portion 92 is wound around the downstream side conveyance roller shaft 14a, and is easily attached and cannot be easily detached. Yes. Further, the length of the contact portion 91 is set so as to protrude radially outward from the downstream side conveyance roller 14.

  As shown in FIG. 4, the discharge assisting member 90 is substantially at the center in the axial direction of the downstream-side transport roller shaft 14a so that the central portion in the width direction can always be pressed regardless of the size of the document 1. It is arranged in the part. 4 shows the downstream side conveyance roller 14 as viewed from the upstream side in the conveyance direction, and shows how the discharge assisting member 90 pushes the rear end of the document 1 to the downstream side in the conveyance direction (backward direction in FIG. 4). Show.

  Next, the operation will be described.

  FIG. 5A to FIG. 5C are cross-sectional views showing the operation of the paper discharge assisting member of the document conveying device according to the first embodiment of the present invention.

  As shown in FIG. 5A, when the downstream-side conveyance roller 14 and the downstream-side conveyance roller shaft 14a rotate, the document 1 is sandwiched between the downstream-side conveyance roller 14 and the downstream-side driven roller 24. Further, the discharge assisting member 90 attached to the downstream side transport roller shaft 14 a rotates together with the downstream side transport roller 14.

  As shown in FIG. 5B, when the contact portion 91 of the discharge assisting member 90 contacts the back surface of the document 1, the discharge assisting member 90 rotates while the contact portion 91 is curved, and the document 1 being conveyed. Does not curve. Note that the reading surface of the document 1 faces upward, and the contact portion 91 of the discharge assisting member 90 contacts the back surface of the document 1. Accordingly, the reading surface of the document 1 is not contaminated by the discharge assisting member 90.

  As shown in FIG. 5C, when the rear end of the document 1 is removed from the sandwiching portion of the downstream side transport roller 14 and the downstream driven roller 24, the front end of the contact portion 91 of the discharge assisting member 90 is behind the document 1. Push the end downstream in the transport direction. In other words, the discharge assisting member 90 conveys the document 1 further downstream after the document 1 has come out of the sandwiching portion between the downstream conveyance roller 14 and the downstream driven roller 24.

  As described above, the document conveying apparatus according to the present embodiment contacts the document 1 when the document 1 is held between the downstream conveying roller shaft 14 a and the downstream conveying roller 14 and the downstream driven roller 24. And a sheet-like discharge assisting member 90 is provided for restoring the document 1 so that the trailing edge of the document 1 is pushed downstream in the document conveyance direction when the document 1 is removed from the downstream conveyance roller 14 and the downstream driven roller 24. Therefore, even if the discharge assisting member 90 contacts the document 1, the discharge assisting member 90 is curved, so that the speed of the downstream transport roller 14 does not change, and the downstream transport roller 14 and the downstream driven roller 24 are not changed. When the original 1 is removed from the original, the paper discharge assisting member 90 is restored and pushes the rear end of the original 1 downstream in the original conveying direction. Therefore, the original 1 can be read with high accuracy, and the original 1 after being read can be discharged and stacked on the first original discharge tray 26 satisfactorily.

  In the document conveying apparatus according to the present embodiment, the discharge assisting member 90 is provided on the downstream conveying roller shaft 14a that is the roller shaft of the downstream conveying roller 14 that is in contact with the back surface of the document 1. Since the auxiliary member 90 comes into contact with the back surface of the document 1, it is possible to prevent the reading surface from becoming dirty.

  Further, in the document conveying apparatus according to the present embodiment, the discharge assisting member 90 is coated with a fluorine-based resin coating having antifouling properties, so that the dirt is attached to the discharge assisting member 90 or the discharge assisting member 90 It is possible to prevent dirt from being transferred from the member 90 to the document 1.

  Further, in the document conveying apparatus according to the present embodiment, the discharge assisting member 90 is disposed at the substantially central portion in the axial direction of the downstream conveying roller shaft 14a. However, since the central portion in the width direction can always be pushed by the discharge assisting member 90, the read document 1 can be discharged and stacked on the first document discharge tray 26 satisfactorily regardless of the size of the document 1. Can do.

  Note that a plurality of paper discharge assisting members 90 may be provided at positions symmetrical with respect to both ends of the downstream-side transport roller shaft 14a with the substantially central portion in the axial direction of the downstream-side transport roller shaft 14a as the center. In this case, even when the document 1 is wide, such as A0 size, the document 1 after reading can be satisfactorily discharged and stacked on the first document discharge tray 26 by the plurality of discharge assisting members 90. it can.

  Instead of attaching the discharge assisting member 90 to the downstream transport roller shaft 14a, the discharge assisting member 90 may be attached to the downstream driven roller shaft 24a. Further, the discharge assisting member 90 may be attached to both the downstream side conveyance roller shaft 14a and the downstream side driven roller shaft 24a.

(Second Embodiment)
FIG. 6 is a perspective view showing the configuration of the discharge assisting member of the document feeder according to the second embodiment of the present invention. FIG. 7 is a front view showing the downstream side conveyance roller of the document conveying apparatus according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and description is abbreviate | omitted.

  As shown in FIGS. 6 and 7, a discharge assisting member 95 made of a fluorine-based resin is attached to the downstream driven roller shaft 24a. The discharge assisting member 95 includes an attachment portion 96 for attaching the discharge assisting member 95 to the downstream driven roller shaft 24a, a contact portion 98 that contacts the document 1 to be discharged, an attachment portion 96, and a contact portion 98. And a shaft portion 97 for connecting the two. The attachment portion 96 is formed in an annular shape with a part opened, and the inner diameter thereof is slightly smaller than the diameter of the downstream driven roller shaft 24a. For this reason, when the discharge assisting member 95 is attached to the downstream driven roller shaft 24a, the downstream driven roller shaft 24a is loosely fitted to the attachment portion 96, and the discharge assisting member 95 is moved downstream. Although it rotates together with the roller shaft 24a, when the rotation is prevented by the document 1, slip occurs between the downstream driven roller shaft 24a and the mounting portion 96, and only the downstream driven roller shaft 24a rotates. ing. Further, the length of the shaft portion 97 is set so that the contact portion 98 protrudes radially outward from the downstream driven roller 24.

  The discharge assisting member 95 has a substantially central portion in the axial direction of the downstream driven roller shaft 24a and a central portion so that the original 1 can be surely pressed by the contact portion 98 regardless of the size of the original 1. Is located at three positions that are symmetrical in the direction of both ends of the downstream driven roller shaft 24a (for example, positions 250 mm from the center). 7 shows the downstream driven roller 24 as viewed from the upstream side in the transport direction, and shows how the discharge assisting member 95 pushes the rear end of the document 1 downstream in the transport direction (the back direction in FIG. 7). Show.

  Next, the operation will be described.

  FIG. 8A to FIG. 8C are cross-sectional views showing the operation of the discharge assisting member of the document conveying device according to the second embodiment of the present invention.

  As shown in FIG. 8A, when the downstream-side transport roller 14 and the downstream-side transport roller shaft 14a rotate, the document 1 is sandwiched between the downstream-side transport roller 14 and the downstream-side driven roller 24. Further, after the paper discharge assisting member 95 attached to the downstream driven roller shaft 24a rotates together with the downstream driven roller shaft 24a, the contact portion 98 comes into contact with the reading surface of the document 1 and stops.

  As shown in FIG. 8B, when the contact portion 98 of the discharge assisting member 95 is in contact with the reading surface of the document 1, slip occurs between the downstream driven roller shaft 24a and the mounting portion 96, While the discharge assisting member 95 is stopped, the document 1 held between the downstream side conveyance roller 14 and the downstream side driven roller 24 is conveyed. At this time, the discharge assisting member 95 and the reading surface of the document 1 are in contact with each other. However, since the discharge assisting member 95 is made of a fluorine-based resin, the reading surface of the document 1 is not contaminated. . Further, since slip occurs between the downstream driven roller shaft 24 a and the attachment portion 96, the discharge assisting member 95 does not bend the document 1.

  As shown in FIG. 8C, when the trailing edge of the document 1 comes out of the sandwiching portion between the downstream transport roller 14 and the downstream driven roller 24, the contact portion 98 of the discharge assisting member 95 moves the trailing edge of the document 1. Push it downstream in the transport direction. That is, the paper discharge assisting member 95 transports the document 1 further downstream even after the document 1 is removed from the sandwiching portion between the downstream transport roller 14 and the downstream driven roller 24.

  As described above, the document conveying apparatus according to the present embodiment rotates with the downstream driven roller shaft 24a when the downstream driven roller shaft 24a is not in contact with the document 1, and is in contact with the document 1. Since the rotation is stopped by the document 1, a discharge assisting member 95 is provided to push the rear end of the document 1 that has come out of the downstream side conveyance roller 14 and the downstream driven roller 24 to the downstream side in the document conveyance direction. When the auxiliary member 95 is in contact with the document 1, the rotation of the downstream driven roller 24 does not change, and when the document 1 is removed from the downstream conveying roller 14 and the downstream driven roller 24, Since the end can be pushed out by the discharge assisting member 95 to the downstream side in the document conveyance direction and conveyed onto the first document discharge tray 26, the document 1 can be read with high accuracy and the document 1 after reading can be read. It can be satisfactorily discharged and stacked on the first document discharge tray 26.

  In the document conveying device according to the present embodiment, the discharge assisting member 95 is made of a fluorine-based resin having antifouling properties, and is a roller shaft of the downstream driven roller 24 that is in contact with the surface of the document 1. Since it is provided on a certain downstream driven roller shaft 24a, it is possible to prevent the surface of the original 1 to be read from becoming dirty.

  Further, in the document conveying apparatus according to the present embodiment, the discharge assisting member 90 is symmetric with respect to both ends of the downstream driven roller shaft 24a about the substantially central portion in the axial direction of the downstream driven roller shaft 24a. Therefore, even when the document 1 is wide, such as A0 size, the document 1 after being read is satisfactorily discharged onto the first document discharge tray 26 by the plurality of discharge assisting members 95. And can be loaded.

  Note that only one discharge assisting member 95 may be disposed at a substantially central portion in the axial direction of the downstream driven roller shaft 24a. In this case, since the central portion in the width direction can always be pressed by the discharge assisting member 95 regardless of the size of the document 1, the document 1 after reading is read as the first document regardless of the size of the document 1. The paper can be discharged and stacked on the paper discharge tray 26 satisfactorily.

  Further, instead of attaching the discharge assisting member 95 to the downstream driven roller shaft 24a, the discharge assisting member 90 may be attached to the downstream conveying roller shaft 14a. Further, the discharge assisting member 95 may be attached to both the downstream side conveyance roller shaft 14a and the downstream side driven roller shaft 24a.

  As described above, the document conveying device according to the present invention has the effects that the document can be read with high accuracy and the document after reading can be discharged and stacked satisfactorily. However, it is useful as a document conveying device that reads an image with a reading unit.

1 is a cross-sectional view illustrating a configuration of a document conveying device according to a first embodiment of the present invention. FIG. 3 is a perspective view illustrating a configuration of a discharge assisting member of the document conveying device according to the first embodiment of the present invention. FIG. 3 is a side view of a downstream side conveyance roller to which a discharge assisting member of the document conveyance device according to the first exemplary embodiment of the present invention is attached. FIG. 3 is a front view illustrating a downstream side conveyance roller of the document conveyance device according to the first exemplary embodiment of the present invention. (A)-(c) is sectional drawing which shows operation | movement of the paper discharge auxiliary member of the original conveying apparatus based on the 1st Embodiment of this invention. FIG. 6 is a perspective view illustrating a configuration of a paper discharge assisting member of a document conveying device according to a second embodiment of the present invention. FIG. 6 is a front view showing a downstream side conveyance roller of a document conveyance device according to a second embodiment of the present invention. (A)-(c) is sectional drawing which shows operation | movement of the paper discharge auxiliary member of the original conveying apparatus based on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Document 11 Document transport device 13 Upstream transport roller (upstream transport roller pair)
14 Downstream conveying roller (downstream conveying roller pair)
14a Downstream conveying roller shaft (roller shaft)
17 Reading unit 23 Upstream driven roller (upstream conveying roller pair)
24 Downstream driven roller (downstream conveying roller pair)
24a Downstream driven roller shaft (roller shaft)
26 First document discharge tray (discharge tray)
90, 95 Paper discharge auxiliary member 91, 98 Contact portion 92, 96 Mounting portion 97 Shaft portion

Claims (7)

A reading unit for reading a document;
An upstream conveyance roller pair provided upstream of the reading unit in the document conveyance direction, and sandwiching the document and conveying the document to the reading unit;
A document conveying device provided on the downstream side of the reading unit in the document conveying direction, and comprising a pair of downstream conveying rollers for nipping the document read by the reading unit and conveying the document on a paper discharge tray;
When the original is sandwiched between the downstream conveying roller pair and the roller shaft of at least one roller of the downstream conveying roller pair, the original comes into contact with the original and curves, and the original from the downstream conveying roller pair An original conveying apparatus, comprising: a sheet-like discharge assisting member that restores the trailing edge of the original so as to push out the trailing edge of the original toward the downstream side in the original conveying direction when the document is removed.   2. The document conveying apparatus according to claim 1, wherein the discharge assisting member is provided on a roller shaft of a roller that is in contact with a back surface of the document of the pair of downstream conveying rollers.   3. The document conveying apparatus according to claim 1, wherein the discharge assisting member is constituted by a member having antifouling property. A reading unit for reading a document;
An upstream conveyance roller pair provided upstream of the reading unit in the document conveyance direction, and sandwiching the document and conveying the document to the reading unit;
A document conveying device provided on the downstream side of the reading unit in the document conveying direction, and comprising a pair of downstream conveying rollers for nipping the document read by the reading unit and conveying the document on a paper discharge tray;
When the roller shaft of at least one roller of the pair of downstream conveying rollers is not in contact with the document, it rotates together with the roller shaft, and when it is in contact with the document, the rotation is stopped by the document. An original conveying apparatus, comprising: a paper discharge assisting member that pushes a rear end of the original that has slipped out of the pair of downstream conveying rollers to the downstream side in the original conveying direction.   5. The discharge assisting member according to claim 4, wherein the discharge assisting member is formed of a member having antifouling property and is provided on a roller shaft of a roller that contacts the surface of the document of the downstream conveying roller pair. Document transport device.   6. The document conveying device according to claim 1, wherein the discharge assisting member is provided at a substantially central portion in the axial direction of the roller shaft. 7. A plurality of the discharge assisting members are provided at positions symmetrical with respect to both end directions of the roller shaft with a substantially central portion in the axial direction of the roller shaft as a center. The document conveying device according to claim 1.

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