JP2011246272A - Delivery paper placement device, image forming device, and image forming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a delivery paper placement device which, even in paper having a high level of curling such as thin paper, can realize smooth paper delivery processing at a high speed and can allow a large quantity of paper sheets to be loaded on a paper delivery tray while correcting curling of paper sheets.SOLUTION: The delivery paper placement device includes a receiving member that, at a position located below a paper delivery roller and spaced on the paper delivery tray and on a mounting surface of paper sheets mounted on the paper delivery tray, receives a posterior portion of paper sheets delivered by the paper delivery roller and allows the paper sheets to be loaded thereon. The delivery paper placement device further includes a dropping means that drops a predetermined quantity of paper sheets, of which the posterior portion has been loaded on the receiving member, on the mounting surface.

Description

  The present invention relates to an image forming apparatus such as an electrophotographic copying machine and a printer, and a paper discharge mounting apparatus that stores paper discharged from a post-processing apparatus that performs folding processing, binding processing, and the like in a paper discharge tray.

  In particular, the present invention relates to a paper discharge placing device that includes a paper discharge tray that can be raised and lowered, and that can accommodate a large amount of paper discharged from an image forming apparatus or a post-processing device on the paper discharge tray.

  In recent years, there has been a tendency for various types of paper to be used in image forming apparatuses and image forming systems, and the occurrence of paper misalignment, paper discharge jam, and the like in the paper discharge unit has become a problem. In particular, in a paper discharge placement device having a paper discharge tray that can be raised and lowered, there is a phenomenon in which the paper curl is increased as the number of papers placed on the paper discharge tray 62 increases as shown in FIG. Due to this phenomenon, paper misalignment, paper discharge jam, paper trailing edge dive, and the like were observed.

  Note that the trailing edge of the sheet is a tentative name for a phenomenon in which the leading edge of the next discharged sheet sinks into the trailing edge of the uppermost sheet having a large curl, as indicated by a broken line circle in FIG.

  In view of this, there has been proposed a paper discharge placement device including a paper discharge placement device having a fixed paper discharge tray, which prevents jamming due to paper curl and allows a large amount of paper to be stacked on the paper discharge tray. (Patent Documents 1 and 2).

  A sheet discharge device described in Patent Document 1 is provided at a plurality of positions in the width direction of the discharge port, and includes a sheet pressing member that presses and contacts a part of the discharged sheet from above, and a sheet pressing member And moving means for lowering or raising the paper, and the paper curl is corrected by regulating the posture of the paper having the upward curl during paper discharge.

  The paper discharge placement device described in Patent Document 2 has a guide member that locks the paper discharged from the discharge port from below and guides it downstream in the paper discharge direction. The paper discharged from the discharge port is rolled by switching the position of the guide member according to the paper discharge operation so that the paper is moved onto the paper tray and retracted to the outside of the paper discharge area in the middle of paper discharge. Even if the paper curls due to paper curling, the paper is regulated on the downstream end of the paper discharge tray and the paper is reliably placed on the paper discharge tray.

JP 2008-143616 A JP 2007-254042 A

  However, in the paper discharge placement device described in Patent Document 1, if the paper discharged from the discharge port is curled as if it is a thin paper, the discharged paper is not smoothly discharged by the paper pressing member. There is a problem of inducing jam. Further, in the case of downward curling, it may be possible to increase the curling, which is not practical.

  Further, the paper discharge placement device described in Patent Document 2 does not correct the paper curl by actively changing the paper posture at the paper discharge unit. Further, the guide member is moved in or out of the paper discharge area for each paper discharge operation, and is not suitable for a post-processing apparatus and an image forming apparatus that process paper at high speed.

  An object of the present invention is to enable a paper discharge process that enables high-speed and smooth discharge processing even for paper with a large curl such as thin paper, and allows a large amount of paper to be placed on a paper discharge tray while correcting paper curl as appropriate. An image forming apparatus, an image forming apparatus, and an image forming system are provided.

  The object of the invention is achieved by the invention described below.

1. A paper discharge placing device for placing a paper discharged and discharged by a paper discharge roller on a paper discharge tray that can be raised and lowered;
Receives and stacks the rear portion of the paper discharged by the paper discharge roller at a position below the paper discharge roller and on the paper discharge tray and on the paper placement surface of the paper placed on the paper discharge tray. A receiving member to
And a dropping unit configured to drop a predetermined amount of paper having a rear portion stacked on the receiving member onto the placement surface.

  2. 2. The paper discharge mounting apparatus according to 1 above, wherein the dropping unit displaces the receiving member.

3. A paper regulating member that regulates the trailing edge of the paper that is stacked on the paper ejection tray and moves in the direction opposite to the paper ejection;
The dropping means displaces the receiving member between a first position protruding in the paper discharge direction with respect to the paper regulating member and a second position positioned in the opposite direction to the first position. 3. The paper discharge mounting apparatus according to 2 above.

  4). 2. The dropping device according to the item 1, wherein the dropping means displaces the leading end of the receiving member downward in accordance with a load of a sheet supporting the receiving member and having a rear portion stacked on the receiving member. Paper discharge placement device.

  5. An image forming apparatus for forming an image on a sheet, comprising the paper discharge mounting apparatus according to any one of 1 to 4 above.

  6). An image forming system comprising: an image forming apparatus that forms an image on a sheet; and a post-processing apparatus that performs post-processing on a sheet on which an image has been formed by the image forming apparatus. An image forming system comprising the paper discharge mounting device according to claim 1 in the post-processing device.

  The present invention is a paper discharge placement and image that enables smooth discharge processing at high speed even for paper with large curls such as thin paper, and allows a large amount of paper to be placed on a paper discharge tray while correcting paper curl as appropriate. It is possible to provide a forming apparatus and an image forming system.

1 is an overall configuration diagram of an image forming system T according to the present invention. These are sectional drawings which show post-processing apparatus FS provided with the paper discharge mounting apparatus based on this invention. These are sectional drawings which show the structure of the paper attitude | position correction | amendment part 66 which concerns on 1st Embodiment. These are the schematic diagrams which show the behavior (the 1) of the principal part of the paper attitude | position correction | amendment part 66 which concerns on 1st Embodiment. These are the schematic diagrams which show the raising behavior (the 2) of the principal part of the paper attitude | position correction | amendment part 66 which concerns on 1st Embodiment. These are the schematic diagrams which show the behavior (the 3) of the principal part of the paper attitude | position correction | amendment part 66 which concerns on 1st Embodiment. These are sectional drawings which show the paper attitude | position correction | amendment part which concerns on 2nd Embodiment of this invention. These are the schematic diagrams which show the behavior (the 1) of the receiving member 661 of 2nd Embodiment. These are the schematic diagrams which show the behavior (the 2) of the receiving member 661 of 2nd Embodiment. These are the schematic diagrams which show the behavior (the 3) of the receiving member 661 of 2nd Embodiment. FIG. 9 is a schematic diagram showing a form of a paper sheet placed on a paper discharge tray in a conventional paper discharge loading device.

  Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the embodiments described below. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall configuration diagram of an image forming system T according to the present invention.

  As shown in FIG. 1, the image forming system T includes an image forming apparatus A and a post-processing apparatus FS.

[Image forming apparatus]
The image forming apparatus A has an image forming unit in which a charging unit 2, an image exposing unit 3, a developing unit 4, a transfer charge eliminating unit 5, and a cleaning unit 6 are arranged around a rotating photoreceptor 1. The image forming unit charges the surface of the photoreceptor 1 by the charging unit 2, and then performs exposure scanning based on image data read from the document by the laser beam of the image exposure unit 3 to form a latent image. The latent image is developed by the developing unit 4 to form a toner image on the surface of the photoreceptor 1.

  The sheet S fed from the sheet storage portion 7A is conveyed to a transfer position on the photoreceptor 1. After the toner image is transferred onto the paper S by the transfer neutralization unit 5 at the transfer position, the charge on the surface of the paper S is erased and separated from the photoreceptor 1 and is transported by the transport unit 7B. Thereafter, the toner image on the paper S is heated and fixed to the paper S by the fixing unit 8, and the paper S is discharged from the image forming apparatus A by the paper discharge roller 7C.

  When images are formed on both sides of the sheet S, the sheet S heated and fixed by the fixing unit 8 is branched from the sheet discharge path by the conveyance path switching unit 7D, and is switched back and reversed by the reverse conveyance unit 7E. Then, the sheet S is conveyed again to the image forming unit, and an image is formed on the back surface of the sheet S. The paper S discharged from the paper discharge roller 7C is sent to the glue binding apparatus B of the post-processing system Y.

  An operation display unit 107 is disposed above the image forming apparatus A, and the contents of a job executed in the image forming system T are input by the user through the operation display unit 107.

[Post-processing equipment]
The post-processing device FS has a first paper feed unit 20A, a second paper feed unit 20B, and a fixed paper discharge table 30 in the upper stage in the figure, and a punching unit 40, a shift unit 50, and a paper discharge placement device 60 in the middle stage. They are arranged in series on the substantially horizontal same plane, and the binding processing unit 70 is provided on the same inclined plane in the lower stage.

  Further, on the left side of the post-processing device FS in the figure, a paper discharge tray 62 for placing the shift-processed paper S and the binding-processed paper bundle is disposed.

  The receiving unit 10 is supplied from the sheet S that has undergone image formation processing from the image forming apparatus A, the slip sheet K1 that partitions the sheet bundle supplied from the first sheet feeding unit 20A, and the second sheet feeding unit 20B. Cover sheet K2 is introduced.

  The slip sheet K1 accommodated in the sheet feeding tray of the first sheet feeding means 20A is separated and fed by the sheet feeding unit 21, is sandwiched between the transport rollers 22, 23, 24, and is introduced into the receiving unit 10. . Further, the cover sheet K2 accommodated in the sheet feeding tray of the second sheet feeding unit 20B is separated and fed by the sheet feeding unit 25, is sandwiched between the transport rollers 23 and 24, and is introduced into the receiving unit 10. .

  Note that the first sheet feeding means 20A and the second sheet feeding means 20B can be loaded with sheets S other than the slip sheet K1 and the cover sheet K2. Hereinafter, the slip sheet K1 and the cover sheet K2 are collectively referred to as a sheet S.

  A punching means 40 is disposed downstream of the receiving unit 10 in the sheet conveyance direction. The punching means 40 includes a driving means for moving in the paper width direction, a punch lifting / lowering driving means, a paper width detecting means, and the like.

  As shown in the drawing, a paper branching means G is provided on the downstream side of the punching means 40 in the paper transport direction. The paper branching means G is driven by a solenoid (not shown) into any of three paper transport paths, that is, one of the first transport path a for upper discharge, the second transport path b in the middle stage, and the third transport path c in the lower stage. The paper S is selectively branched.

  For example, when the first transport path a is selected, the sheet branching unit G blocks the second transport path b and the third transport path c and opens only the first transport path a. The sheets S are lifted and discharged on the first transport path a, and are sequentially stacked and placed on the fixed sheet discharge table 30.

  When the second transport path b is selected, the image-formed paper S discharged from the image forming apparatus A passes through the second transport path b, and the paper discharge tray of the paper discharge mounting device 60 outside the apparatus. The paper is discharged to 62.

[Paper loading device]
The paper discharge placing device 60 includes a paper discharge roller 63 as a paper discharge unit, a paper discharge tray 62 for placing the paper S discharged by the paper discharge roller 63, a lifting mechanism 61 for raising and lowering the paper discharge tray 62, and a discharge mechanism. And a sheet regulating member that regulates the position of the trailing edge of the sheet that is placed on the paper tray 62 and moves by its own weight in the direction opposite to the sheet discharge. When discharging a large number of sheets S, the lifting mechanism 61 is operated to sequentially lower the discharge tray 62.

  FIG. 2 is a cross-sectional view showing a post-processing device FS provided with a paper discharge placement device according to the present invention.

  Based on FIG. 2, the elevating mechanism 61 of the paper discharge tray 62 will be described below.

  The elevating motor M rotationally drives the drive pulley 611 via the reduction gear train Z, and rotates the wire 614 wound around the drive pulley 611 and the upper driven pulley 612. One end of the wire 614 is fixed to the base of the paper discharge tray 62 with a locking member 615, and the paper discharge tray 62 is moved up and down along the paper regulating member 64 by the rotation of the wire 614. A roller 613 is rotatably supported at the base of the paper discharge tray 62, and moves up and down smoothly.

  Above the sheet regulating member 64, there is a tray upper limit position sensor PS 1 that detects the upper limit position of the discharge tray 62, and the placement surface of the discharge tray 62 or the upper surface of the sheet S placed on the discharge tray 62. The upper surface position sensor PS2 for detecting A tray lower limit position sensor PS3 for detecting the lowest limit position of the paper discharge tray 62 indicated by the broken line in the figure is disposed below the sheet regulating member 64.

  When the discharge tray 62 rises and the detected portion of the discharge tray 62 blocks the optical path of the tray upper limit position sensor PS1, the lifting motor M that raises the discharge tray 62 is stopped. When the paper discharge tray 62 is lowered and the detected portion of the paper discharge tray 62 blocks the optical path of the tray lower limit position sensor PS3, the lifting motor M that lowers the paper discharge tray 62 is stopped. The paper discharge tray 62 can move from the upper limit position to the lower limit position according to the amount of sheets to be loaded, and can place a maximum of about 3000 sheets of paper S.

<< First Embodiment of Paper Posture Correction Unit >>
FIG. 3 is a cross-sectional view illustrating a configuration of the paper posture correction unit 66 according to the first embodiment of the present invention.

  As shown in FIG. 3, the paper posture correction unit 66 includes a receiving member 661 and a dropping unit 662. The receiving member 661 is disposed below the paper discharge roller 63 composed of the main paper discharge roller 63A and the sub paper discharge roller 63B and above the uppermost position of the paper discharge tray 62, and is discharged by the paper discharge roller 63. The rear portion of the sheet S is received and stacked. The dropping means 662 displaces the receiving member 661 in the paper discharge direction or in the direction opposite to the paper discharge.

  The receiving member 661 is separated upward by a predetermined distance G from the placement surface of the paper discharge tray 62 or the paper placement surface of the paper placed on the paper discharge tray 62 by the dropping means 662, and the paper regulation member 64. Is disposed at a first position P1 that protrudes by a predetermined length L1 in the paper discharge direction with respect to the restriction surface. Then, the rear portion of the sheet S discharged and lowered by the sheet discharge roller 63 is received and stacked.

  As will be described in detail later, an intermediate region of the paper S positioned between the front portion of the paper S placed on the paper discharge tray 62 and the rear portion of the paper S received and supported by the receiving member 661. Then, the paper is in a bridge state that is not supported by anyone, and downward force due to its own weight acts on the paper.

  Therefore, the formation of the bridge state acts so as to correct the upper curl of the paper S in which the central portion in the paper discharge direction swells upward. In particular, in the case of thin paper, when the paper S collides with the paper regulating member 64, the upper curl is increased by the inertia force of the paper itself. Therefore, the formation of the bridge state by the receiving member 661 is more effective for correcting the paper posture. Act on.

  When a predetermined number of sheets S or more are placed on the receiving member 661, the dropping unit 662 retracts the receiving member 661 to the first position P2 located behind the sheet restricting member 64, so that the sheet posture is reduced. This is means for dropping the corrected sheet S on the receiving member 661 onto the discharge tray 62.

  The dropping means 662 drops the sheet S on the receiving member 661 and then returns the receiving member 661 to the first position P1, so that the new sheet S to be subsequently discharged receives the trailing end portion of the receiving member 661. It is received at 661.

  The dropping means 662 includes a holding member 662A that supports the receiving member 661, a slide member 662B that is fixed on both sides of the main body and supports both sides of the holding member 662A so as to be movable in a direction indicated by an arrow e, and a solid line. The urging member 662C (not shown) that urges both sides of the holding member 662A so as to move the receiving member 661 to the first position P1, and both ends of the holding member 662A are discharged against the urging member 662C. And a plurality of solenoids SD1 that pull in the opposite direction of the paper. When the plurality of solenoids SD1 are operated simultaneously, the receiving member 661 moves to the second position P2 indicated by the broken line, and the sheet S with the rear portion stacked on the receiving member 661 is moved back by the restriction surface of the sheet restriction member 64. The paper is dropped and placed on the placement surface of the paper discharge tray 62 while the end is regulated.

  The upper surface detection unit 65 includes a support shaft 652 rotatably supported by a bearing unit (not shown) fixed to the main body at both ends in the width direction orthogonal to the paper discharge direction, and the support shaft 652 distributed in the width direction. A plurality of paper detection arms 651 provided, an upper surface position sensor PS2 fixed to the main body on the rear side in the width direction, and a light detection unit of the upper surface position sensor PS2 fixed to the support shaft 652 on the rear side in the width direction. And a detection actuator 653 that is shut off or opened.

  The paper detection arm 651 is raised in the direction of the arrow d as the paper discharge proceeds. When the rear portion of the paper S reaches a predetermined height, the detection actuator 653 blocks the light detection unit of the top surface position sensor PS2.

<< Descent operation of the paper discharge tray 62 and operation of the paper posture correction unit >>
4 to 6 are schematic diagrams showing the behavior of the main part of the paper posture correcting unit 66 according to the first embodiment. The lowering operation of the paper discharge tray 62 and the displacement operation of the receiving member 661 according to the first embodiment as the paper S is discharged are shown.

  FIG. 4A shows a state in which the discharge of a new print job is started after the operator removes all the sheets placed on the discharge tray 62 and is discharged by the discharge roller 63. The rear portion of the sheet S is lowered along a locus as indicated by an arrow f and is received on the receiving member 661. The paper detection arm 651 is positioned at the lowest position, and the detection actuator 653 opens the light detection unit of the upper surface position sensor PS2.

  In FIG. 4B, the upper surface position of the sheet S whose rear portion is stacked on the receiving member 661 is displaced upward by a predetermined distance D1 with respect to the receiving member 661 as the paper discharge proceeds, and the upper surface position sensor PS2 is displayed. It is a schematic diagram which shows the state by which the light detection part of this was shielded by the detection actuator 653.

  As shown in FIGS. 4A and 4B, the paper S whose rear portion is received by the receiving member 661 is separated from the paper discharge tray 62, and a bridge state is formed on the paper S.

  When the upper surface detection sensor PS2 detects the upper surface position in the rear portion of the paper S, the elevating motor M performs a lowering operation and lowers the paper discharge tray 62 by a predetermined distance D2.

  FIG. 5A is a schematic diagram illustrating a state after the discharge tray 62 has been lowered by a predetermined amount.

  Next, the operation of the solenoid SD1 of the dropping means 662 moves the receiving member 661 in the direction opposite to the paper discharge indicated by the arrow e in FIG. 5B to displace it from the first position P1 to the second position P2.

  As a result, the sheet S on the receiving member 661 whose sheet posture is corrected by forming the bridge state is dropped onto the sheet discharge tray 62 as shown in FIG. It is placed in a state where it hits the regulation surface. The paper detection arm 651 rotates in the direction of arrow g according to the fall of the paper S and is displaced to the lowest position, and the light detection unit of the upper surface position sensor PS2 is opened.

  Next, the solenoid SD1 of the dropping means 662 is switched to an inoperative state.

  The receiving member 661 is moved in the paper discharge direction and displaced to the first position P1 by the urging force of the urging member 662C as indicated by the arrow h in FIG.

  As shown in FIG. 6A, the newly discharged paper S is lowered along the locus indicated by the arrow f, and the rear portion is received on the receiving member 661.

  Note that D1≈D2.

  Accordingly, the receiving member 661 is always separated from the upper surface position of the paper S placed on the paper discharge tray 62 by a predetermined distance, and the paper stacked on the receiving member 661 is used for correcting the paper posture. A bridge state is formed.

  As described above, the paper discharge placement device including the paper correction unit according to the first embodiment repeats FIGS. 4A to 6A and the paper whose rear portion is stacked on the receiving member 661. The paper posture is constantly corrected with respect to S by forming a bridge state, and as shown in FIG. 6 (b), the paper can be raised and lowered without occurrence of curled paper discharge, trailing edge dive, uneven paper discharge, and paper discharge jam. Various types of sheets can be placed and accommodated on the discharge tray 62 in a large capacity.

<< Second Embodiment of Paper Posture Correction Unit >>
FIG. 7 is a cross-sectional view showing a sheet orientation correcting unit 66 according to the second embodiment of the present invention.

  The paper posture correction unit 66 is composed of at least a receiving member 661 and a dropping unit 662.

  The receiving member 661 is not displaceable in the paper discharge direction or the direction opposite to the paper discharge as in the first embodiment, and is fixed below the paper discharge roller 63. Further, it is fixed at a position spaced apart by a predetermined distance from the uppermost surface of the paper S placed on the paper discharge tray 62 and regulated by the paper regulating member 64. The receiving member 661 has a leading end protruding by a predetermined distance L2 in the paper discharge direction with respect to the restriction surface of the paper restricting member 64, and receives and stacks the rear portion of the paper S discharged from the paper discharge roller 63. Is.

  The dropping means 662 displaces the leading end of the receiving member 661 downward according to the weight of the paper whose rear portion is stacked on the receiving member 661, and the number of paper whose rear portion is stacked on the receiving member 661 decreases. Then, the structure which displaces the front-end | tip of the receiving member 661 upward is provided.

  Here, the dropping means 662 is configured such that the receiving member 661 is formed of a thin plate made of stainless steel or an elastic member such as polyethylene terephthalate, and the other end opposite to the leading end of the receiving member 661 is fixed to the paper regulating member 64. The structure is fixed to the support member 662F. Then, according to the dead weight of the paper S stacked on the receiving member 661, the front end 662H of the receiving member 661 is displaced downward as shown in the drawing, and the rear of the paper S stacked on the receiving member 661 is displayed. It is the structure which drops a part.

  However, the dropping means 662 is not limited to this configuration. For example, using the rigid receiving member 661, the dropping means 662 includes a support member that rotatably supports the receiving member 661 at a fulcrum, a spring that biases the tip of the receiving member 661 to a predetermined height position, and the like. The biasing member 661 may be displaced downwardly against the biasing force of the biasing member in accordance with the weight of the paper loaded on the receiving member 661. .

  As shown in the drawing, the receiving member 661 is a polyethylene terephthalate sheet material having a thickness of 100 μm, and the other end is fixed to a support member 662F fixed to the sheet regulating member 64. The receiving members 661 are disposed at each of a plurality of positions in the width direction orthogonal to the paper discharge direction, and each receiving member 661 passes through a plurality of openings 64A provided in the paper restricting member 64, so It protrudes by a distance L1 in the paper discharge direction with respect to the regulation surface.

  The receiving member 661 is below the uppermost position of the ascending / descending sheet discharge tray 62, and the sheet discharge tray 62 is provided with a plurality of notches 62A so that the descending sheet discharge tray 62 does not interfere with the receiving member 661. ing.

  8 to 10 are schematic diagrams illustrating the behavior of the receiving member 661 according to the second embodiment in accordance with the progress of the paper discharge and the lowering of the paper discharge tray 62.

  FIG. 8A shows a state in which the discharge of a new print job is started after the operator removes all the sheets placed on the discharge tray 62, and is discharged by the discharge roller 63. The rear portion of the sheet S is lowered along a locus indicated by an arrow f and is placed on the sheet discharge tray 62. The receiving member 661 is positioned below the placement surface of the paper discharge tray 62. The paper detection arm 651 is positioned at the lowest position, and the detection actuator 653 opens the light detection unit of the upper surface position sensor PS2.

  In FIG. 8B, the upper surface position of the paper S stacked on the paper discharge tray 62 is displaced upward by a predetermined distance D1 from the paper discharge tray 62 as the paper discharge progresses, and the light detection unit of the upper surface position sensor PS2 FIG. 6 is a schematic view showing a state where is blocked by a detection actuator 653.

  When the upper surface detection sensor PS2 detects the upper surface position of the paper S, the elevating motor M performs a lowering operation to lower the paper discharge tray 62 by a predetermined distance D2.

  FIG. 9A is a schematic diagram showing a state after the discharge tray 62 has been lowered by a predetermined amount.

  The broken line indicates the mounting surface of the paper discharge tray 62 before being lowered, and the paper discharge tray 62 is lowered by a predetermined distance D2 as shown in the figure.

  Due to the lowering of the paper discharge tray 62, the receiving member 661 receives the rear portion of the paper S placed on the paper discharge tray 62 instead of the paper discharge tray 62. As shown in the figure, since the receiving member 661 is positioned above the paper discharge tray 62, the paper S whose rear portion is received by the receiving member 661 has a bridge state.

  FIG. 9B is a schematic diagram illustrating a state where the upper surface position of the sheet S with the rear portion stacked on the receiving member 661 is blocked by the detection actuator of the upper surface detection sensor as the paper discharge progresses further. It is. The receiving member 661 is greatly deformed.

  Even in this state, a bridge state is formed on the sheet S having the rear portion stacked on the receiving member 661.

  When the upper surface detection sensor PS2 detects the upper surface position of the paper S, the elevating motor M performs a lowering operation to lower the paper discharge tray 62 by a predetermined distance D2.

  FIG. 10A is a schematic diagram showing a state after the discharge tray 62 has been lowered by a predetermined distance D2 with the rear portion of the sheet S being stacked on the receiving member 661. FIG. A broken line indicates a placement surface of the paper discharge tray 62 before being lowered.

  Here, due to the lowering of the paper discharge tray 62, most of the sheets S stacked at the rear portion on the receiving member 661 fall and are placed on the paper discharge tray 62. Further, the sheet S having the trailing edge stacked on the receiving member 661 remains.

  The sheet S dropped from the receiving member 661 is sufficiently corrected for the sheet posture by forming a bridge state, and is placed on the sheet discharge tray in a state where the rear end abuts against the regulating surface of the sheet regulating member 64. Is done. Further, the non-falling paper S remaining on the receiving member 661 is further continued in the bridge state, and the correction of the paper posture is advanced.

  Then, the trailing edge of the sheet S that has descended along the locus indicated by the arrow f is received by the sheet S stacked on the receiving member 661 and then moves to the opposite side of the sheet discharge direction along the sheet surface to move the sheet regulating member. Stop at 64 regulatory aspects.

  As described above, the paper discharge placement device including the paper correction unit according to the second embodiment repeats FIGS. 8A to 10A to the paper S stacked on the receiving member 661. The paper tray is continuously corrected by forming a bridge state, and as shown in FIG. 10 (b), the paper discharge tray can be moved up and down without the occurrence of curled paper discharge, trailing edge dive, uneven paper discharge, and paper discharge jam. Various sheets can be placed and accommodated in a large capacity on 62.

  Note that the paper discharge mounting device of the present invention corrects the paper posture with a simple mechanism, and does not regulate the paper being discharged at the paper discharge port, and realizes smooth paper discharge performance. ing.

  In the above-described embodiment, the paper discharge placement device 60 is provided in the post-processing device FS. However, the present invention is not limited to this. For example, the paper discharge placement device 60 provided in the image forming apparatus A. Is also a subject of the present invention.

S paper 60 paper discharge placement device 63 paper discharge roller 62 paper discharge tray 64 paper restriction member P1 first position P2 second position 661 receiving member 662 dropping means

Claims (6)

A paper discharge placing device for placing a paper discharged and discharged by a paper discharge roller on a paper discharge tray that can be raised and lowered;
Receives and stacks the rear portion of the paper discharged by the paper discharge roller at a position below the paper discharge roller and on the paper discharge tray and on the paper placement surface of the paper placed on the paper discharge tray. A receiving member to
And a dropping unit configured to drop a predetermined amount of paper having a rear portion stacked on the receiving member onto the placement surface.   The paper discharge placement device according to claim 1, wherein the dropping unit displaces the receiving member. A paper regulating member that regulates the trailing edge of the paper that is stacked on the paper ejection tray and moves in the direction opposite to the paper ejection;
The dropping means displaces the receiving member between a first position protruding in the paper discharge direction with respect to the paper regulating member and a second position positioned in the opposite direction to the first position. The paper discharge mounting apparatus according to claim 2.   2. The dropping unit according to claim 1, wherein the dropping unit displaces the leading end of the receiving member downward in accordance with a load of a sheet that supports the receiving member and has a rear portion stacked on the receiving member. The paper discharge mounting apparatus described.   An image forming apparatus for forming an image on a sheet, comprising the paper discharge mounting apparatus according to claim 1.   5. An image forming system comprising: an image forming apparatus that forms an image on a sheet; and a post-processing apparatus that performs post-processing on a sheet on which an image is formed by the image forming apparatus. An image forming system comprising the paper discharge mounting apparatus according to any one of claims 1 to 5 in the post-processing apparatus.

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