JP2007076858A - Paper sheet treatment device and paper sheet treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper sheet treatment device and a paper sheet treatment method capable of piling up the paper sheets fed to a tray at stable attitude. <P>SOLUTION: The post-treatment device has a stand-by tray 4 for receiving the paper sheets fed from a digital copying machine; a treatment tray for receiving the paper sheets dropped off from the stand-by tray 4; and a stapler for staple-treating a rear end aligned by the treatment tray. After the first sheet of the paper sheets is fed to the stand-by tray, a stand-by tray roller 32 is reversed and the paper sheets is slightly returned. After the rear end is arranged at a retaining position on the receiving part 42, the rear end is pressed by a pressing member 60 and the second sheet of paper sheets is received. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a paper sheet processing apparatus and a paper sheet processing method for aligning paper sheets sent to a tray in a stacked state.

  2. Description of the Related Art Conventionally, as a paper sheet processing apparatus, a sheet post-processing apparatus having a sheet stock portion including a paddle in a conveyance path that guides a sheet to a processing tray that stacks a plurality of sheets and staples the sheet is known (for example, (See Patent Document 1). The sheet stock unit functions to wait for the next several sheets until the stapling process in the processing tray is completed.

  In this apparatus, every time a sheet is stocked in the sheet stock section, the paddle is rotated to press the rear end in the sheet conveying direction downward so as not to interfere with the sheet fed into the sheet stock section. Accordingly, when a plurality of sheets are stocked, it is possible to prevent the sheets accumulated first and the sheets fed later from colliding, and the plurality of sheets can be accumulated and stocked in order.

However, in the conventional sheet post-processing apparatus described above, the paddle is rotated 180 degrees each time a sheet is fed into the sheet stock portion, and the sheet rear end is bent downward by hitting it with the paddle, so that a relatively loud sound is generated. . Further, each time the sheets are stacked, the trailing edge of the sheet is forcibly bent downward from the conveyance path. Therefore, when the stocked sheet is supplied to the processing tray, the trailing edge of the sheet curls and the accumulation state deteriorates. .
JP 2001-171889 A (abstract, FIGS. 7 to 15)

  An object of the present invention is to provide a paper sheet processing apparatus and a paper sheet processing method capable of stacking paper sheets fed to a tray in a stable posture.

  In order to achieve the above object, a paper sheet processing apparatus according to the present invention includes a tray for collecting and stacking paper sheets, a feeding mechanism for feeding paper sheets in a first direction toward the tray, and a tray. A receiving mechanism for receiving and receiving the rear end of the fed paper sheet along the first direction; a holding mechanism having a pressing member for holding the rear end in cooperation with the receiving part; and the tray The paper sheet fed into the sheet is slightly returned in the second direction opposite to the first direction, and the rear end of the paper sheet is returned to the holding position between the receiving portion and the pressing member. After the paper sheet is fed to the mechanism and the tray, the trailing edge of the paper sheet is slightly returned to the second direction so as to be placed at the holding position, and the paper sheet is The feeding mechanism and the holding machine so as to wait for the reception of the next sheet with the edge held. , And the return and a control unit for controlling the mechanism.

  According to the invention, since the rear end of the paper sheet received in the tray is held by the holding mechanism, it is possible to prevent the rear end of the paper sheet and the front end of the paper sheet to be fed next from colliding, It is possible to prevent the sheet from being displaced by the next sheet fed, and to accumulate the sheet in a stable posture. In particular, since the trailing edge of the paper sheet received in the tray is returned in the reverse direction, the trailing edge is held, so even if the trailing edge of the paper sheet is too far away from the receiving portion, The edge can be held securely.

  The paper sheet processing method according to the present invention includes a feeding step of feeding paper sheets along the first direction to a tray inclined upward in the first direction, and the paper fed to the tray. A step of placing and receiving the rear end of the leaf in the first direction on the receiving portion, and returning the paper sheet fed to the tray in a second direction opposite to the first direction. And a holding step of holding the rear end in cooperation with the receiving portion by pressing the rear end from above with a pressing member.

  Since the paper sheet processing apparatus of the present invention has the above-described configuration and operation, the paper sheets fed to the tray can be accumulated in a stable posture.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a schematic diagram of a post-processing apparatus 1 that functions as a paper sheet processing apparatus according to an embodiment of the present invention, and a digital copying machine 10 to which the post-processing apparatus 1 is connected.

  The digital copying machine 10 includes a housing 12 that forms an outer shell of the apparatus, and a document placing table 12 a made of a transparent glass plate on the upper surface of the housing 12. An automatic document feeder 14 (hereinafter simply referred to as ADF 14) is provided on the document table 12a so as to be openable and closable. The ADF 14 operates to automatically send the document D to a predetermined position on the document placing table 12a.

  For example, when the document D is set on the paper feed tray 14a of the ADF 14, the presence / absence of stapling, the method of stapling, the number of copies, the paper size, etc. are set, and the copy start switch is pressed, the original on the paper feed tray 14a D is automatically fed one by one to the document reading position on the document table 12a, and is automatically discharged at an appropriate timing after the document is read.

  Inside the housing 12, a scanner unit 16, a printer unit 18, cassettes 21, 22, and 23 for copy paper P are disposed. Further, a large-capacity feeder 24 that accommodates a large amount of paper of the same size and a manual feed tray 25 are attached to the right wall of the housing 12 in the drawing. Further, a post-processing device 1 to be described later is connected to the left wall of the housing 12 in the figure.

  The scanner unit 16 illuminates and scans the document D fed to the document reading position on the document table 12a by the ADF 14, scans the reflected light, performs photoelectric conversion, and acquires image information of the document D.

  The printer unit 18 biases the laser device 18a based on the image information read by the scanner unit 16, and forms an electrostatic latent image based on the image information on the peripheral surface of the photosensitive drum 18b. Then, the printer unit 18 supplies toner to the electrostatic latent image on the photosensitive drum 18b via the developing device 18c to make it visible, and transfers the toner image onto the copy paper P by the transfer charger 18d. At this time, the copy paper P is fed from the cassettes 21, 22, 23, the large capacity feeder 24, and the manual feed tray 25. Further, the printer unit 18 supplies the copy paper P onto which the toner image has been transferred to the fixing device 18 e, heats and melts the toner image to fix it on the copy paper P, and discharges it to the post-processing device 1 through the discharge port 20. . The copy paper P discharged through the discharge port 20 corresponds to the paper sheet M of the present invention.

  After passing through the fixing device 18e, the copy paper P that requires double-sided copying is transported to the reverse transport path 26 and turned upside down, and sent again to the fixing region between the photosensitive drum 18b and the fixing device 18e. .

  On the other hand, the post-processing apparatus 1 stacks copy sheets on which images are formed, that is, sheets M discharged through the discharge port 20 of the digital copying machine 10 in units of copies (units for the number of sheets to be bound together). Operates to prepare and staple. The stapling process is a process of arranging and binding one end of a plurality of stacked paper sheets M.

  The post-processing apparatus 1 has an entrance roller 2 and an entrance sensor 3 at a position facing the discharge port 20 of the digital copying machine 10. The inlet sensor 3 detects the front and rear end passages of the paper sheet M fed into the post-processing apparatus 1 via the inlet roller 2 (first direction) (in the direction of arrow T in the figure).

  The post-processing apparatus 1 collects several sheets M fed in the direction of the arrow T via the entrance roller 2 and waits for the sheets M to be waiting, and the sheets M dropped from the waiting tray 4. And a stapler 8 for stapling the rear end of the paper sheets M collected and collected in the processing tray 6. Note that the standby tray 4 and the processing tray 6 are inclined downward toward the rear end of the paper sheet M in the feeding direction.

  Since the staple processing by the stapler 8 requires a certain processing time, when the paper sheets M in the processing tray 6 are stapled, the next number of copies of the paper sheets M is different from the processing tray 6. You need to wait at the place. In the present embodiment, when stapling the paper M of the previous number of copies, two sheets M out of the paper M of the next number of copies are made to wait on the standby tray 4, and the front The time for stapling the paper sheets M in the number of copies was ensured.

  That is, the first sheet M and the second sheet M fed in the direction of the arrow T are stacked on the standby tray 4 and waited after the stapling process for the previous number of copies is completed. Two sheets M were dropped onto the processing tray 6 and the third and subsequent sheets M were directly stacked on the processing tray 6 via the standby tray 4.

  That is, as shown in FIG. 2, the standby tray 4 is opened and closed in a direction intersecting with the feeding direction T of the sheet M (in the direction of arrow W in the figure) (hereinafter, this direction is referred to as the width direction W). Open / close trays 4r and 4f. The open / close trays 4r and 4f are connected to a motor via a rack and pinion mechanism (not shown here), for example, and support positions for supporting the vicinity of the rear end corner in the feed direction of the sheet M fed in the arrow T direction. The opening / closing operation is performed in synchronization with each other between the release position for releasing the support.

  When the open / close trays 4r and 4f are opened to the release position, the accumulated sheets M are dropped to the processing tray 6. At this time, since the width of the opening formed between the two open / close trays 4r and 4f is widened toward the upstream side in the feed direction, when the open / close trays 4r and 4f are opened, the stacked paper sheets The rear end in the feed direction of the class M is dropped onto the processing tray 6 first. Further, since both the standby tray 4 and the processing tray 6 are inclined downward toward the rear end side, when the paper sheet M falls from the standby tray 4 to the processing tray 6, it is slightly urged toward the rear end side. The

  As shown in FIG. 1, on the upstream side of the standby tray 4 in the feeding direction, a paper feed roller 31 (feed mechanism) that clamps the paper sheet M fed in the arrow T direction and feeds it to the standby tray 4. Is provided. The paper feed roller 31 has a plurality of upper rollers 31a and lower rollers 31b facing each other. The sheet feeding roller 31 starts to rotate when the above-described entrance sensor 3 detects passage of the paper sheet M in the feeding direction, and the entrance sensor 3 causes the paper sheet M to pass through the trailing edge of the feeding direction. It is controlled to stop the rotation with the detection as a trigger.

  As shown in FIG. 1, a standby tray roller 32 (return mechanism) is provided on the downstream side of the standby tray 4 in the feeding direction (not shown in FIG. 2). The standby tray roller 32 is disposed to face and separate from the paper sheet placement surface of the standby tray 4 so as to be rotatable in both forward and reverse directions with a paper sheet sandwiched between idle rollers described later. ing. In other words, the paper sheet M fed to the standby tray 4 is slightly conveyed in the direction opposite to the feeding direction T (second direction) and aligned so that the paper sheet M does not require stapling. After accumulating on the standby tray 4, the paper rolls forward to be discharged toward the discharge trays 36 and 38. The paper discharge trays 36 and 38 can be moved up and down according to the processing target.

  More specifically, when the sheets M are stacked on the standby tray 4, the standby tray roller 32 is retracted upward, and the sheets M are stacked and then lowered toward the standby tray 4. In this manner, in a state where the standby tray roller 32 is in contact with the stacked paper sheets M, the standby tray roller 32 is reversed, and the rear end of the paper sheet M in the feeding direction is abutted against a stopper (not shown) and aligned. To do. Thereafter, in order to receive the next sheet M to be fed onto the standby tray 4, the standby tray roller 32 is retracted upward again.

  The processing tray 6 has a flat paper sheet placement surface 6a on which the paper sheets M dropped from the standby tray 4 are placed and accumulated. Further, the processing tray 6 places a part of the transport mechanism 34 (see FIG. 1) for sending out the sheets M stacked and placed on the processing tray 6 toward the discharge trays 36 and 38. An opening 6b for exposing from the surface 6a is provided.

  Further, between the standby tray 4 and the processing tray 6, there is provided a feed member 40 as shown partially enlarged in FIG. In the present embodiment, the two feeding members 40 are provided apart from each other in the rotation axis direction, but three or more feeding members 40 may be attached. The structure shown in FIG. 3 is incorporated in the space indicated by S in FIG.

  That is, these feeding members 40 are arranged at positions that act on the rear end of the paper sheet M received in the standby tray 4 in the feeding direction, guide the rear end of the paper sheet M toward the processing tray 6, and process it. It operates so as to scrape the vicinity of the rear end of the sheet M dropped on the tray 6 in the direction opposite to the feeding direction.

  More specifically, as shown in FIG. 4, each feeding member 40 includes a receiving portion 42 that receives and receives the rear end in the feeding direction of the paper sheet M fed to the standby tray 4. The hitting portion 44 for hitting the rear end received downward, the paddle 46 for scraping the vicinity of the rear end of the paper sheet M dropped on the processing tray 6 toward the stopper 50, the receiving portion 42, and the hitting portion 44. And a rotating body 48 to which the rear end of the paddle 46 is attached. That is, the feed member 40 operates while rotating the rotating body 48 in the arrow R direction (counterclockwise direction) in the drawing.

  Between the two feeding members 40, a pressing member 60 (FIG. 3) that presses the rear end of the paper sheet M received in the standby tray 4 downward is provided. As shown in FIG. 10, the pressing member 60 is disposed in a nested manner between the two receiving portions 42 of the two feeding members 40, and the rear end of the paper sheet M supported by the receiving portion 42 is disposed on the paper sheet. It is operated so as to be pressed from above M, and the rear end of the sheet M is clamped in cooperation with the two receiving portions 42. A rubber material 61 is attached to the surface where the pressing member 60 contacts the paper sheet M to prevent slippage. These two receiving portions 42 and the pressing member 60 function as a holding mechanism of the present invention.

  The pressing member 60 is operated by a solenoid 62 as shown in FIG. That is, with the solenoid 62 turned on, as shown in FIG. 11A, the solenoid 62 is disposed at an operation position for pressing the rear end of the paper sheet M, and with the solenoid 62 turned off, FIG. As shown in FIG. 2, the sheet is disposed at the retracted position retracted upward from the paper sheet M. The pressing force of the pressing member 60 against the paper sheet M is applied by an α spring (not shown) in a state where the pressing member 60 is disposed at the operating position. The driving mechanism for operating the pressing member 60 between two positions may be any type and is not limited to a solenoid.

  FIG. 12 schematically shows the standby tray 4 and its peripheral structure. According to this, it can be seen that the weight member 70 is rotatably attached to the rotation shaft of the roller 31a on the upper side of the paper feed roller 31 for feeding the paper sheet M to the standby tray 4. The weight member 70 is formed in, for example, an elongated plate shape, and one end of the weight member 70 is attached so as to be freely rotatable with respect to the rotation shaft of the roller 31a. Can be pressed from. In the present embodiment, two weight members 70 are provided apart from each other along the rotation axis of the roller 31a.

  Further, the standby tray roller 32 described above is disposed on the downstream side of the standby tray 4 in the feeding direction. The standby tray roller 32 rotates in both forward and reverse directions with the paper sheet M interposed between the idle tray 33 and a idle roller 33 that is rotatably mounted at a position facing the standby tray 4. Note that when the paper sheet M is received in the standby tray 4, it is retreated upward in the figure by a retraction mechanism (not shown).

  When the paper sheet M is sent to the standby tray 4 by the paper feed roller 31, the weight member 70 is flipped up by the waist of the paper sheet M, and the leading end of the rotation of the weight member 70 is the paper sheet M. The sheet M is fed toward the standby tray roller 32 while being in sliding contact with the upper surface. At this time, the standby tray roller 32 is retracted upward and is not in contact with the idle roller 33. Then, after the rear end of the paper sheet M in the feeding direction passes through the nip of the paper feed roller 31, the rear end of the paper sheet M is urged downward by the weight of the weight member 70, and the receiving portion 42 of the feeding member 40. Pressed up.

  At this time, when the paper sheet M is of a relatively weak type, the paper sheet M is curved relatively large by the weight member 70 until the trailing end of the paper sheet M passes through the nip of the paper feed roller 31. Is done. On the other hand, in the case of a relatively strong type of paper sheet M, the paper sheet M is fed into the standby tray 4 while maintaining a substantially straight state. For this reason, depending on the type of the paper sheet M, the behavior of the paper sheet sent to the standby tray 4 varies, and the trailing edge stop position of the paper sheet M changes.

The operation of the post-processing apparatus 1 described above will be described below with reference to FIGS. 5 to 9, illustration of the pressing member 60 and the weight member 70 described above is omitted.
First, when the first sheet M is fed from the digital copying machine 10, the feeding member 40 is arranged in the posture shown in FIG. At this time, the pressing member 60 is arranged in the posture shown in FIG. In this state, the sheet M is fed over the holding tray 60 and over the standby tray 4.

  The paper sheet M fed to the standby tray 4 is conveyed between the standby tray roller 32 and the idle roller 33 while being slightly bent downward by the weight of the weight member 70. At this time, the standby tray roller 32 is retracted upward and separated from the idle roller 33. When the rear end of the paper sheet M in the feeding direction passes through the nip of the paper feed roller 31, the rear end is pressed toward the receiving portion 42 by the weight member 70, and the rear end is the receiving portion of each of the two feeding members 40. 42 is supported.

  At this time, since the standby tray 4 is inclined downward toward the upstream side in the feeding direction, the paper sheet M is slightly biased toward the rear end side by its own weight, and the width of the opening between the open / close trays 4r and 4f. Is widened toward the rear end of the paper sheet M, the center of the rear end hangs downward due to its own weight. That is, the vicinity of the center of the rear end of the hanging paper sheet M is supported by the receiving portion 42 of the feeding member 40. In this state, the paper sheet M is only placed on the open / close trays 4r and 4f and the two receiving portions 42 and 42, and thus is movable by an external force.

  Further, as described above, since the behavior of the paper sheet M fed to the standby tray 4 differs depending on the waist of the paper sheet M, the stop position of the rear end changes. For this reason, in this embodiment, after that, the paper sheet M is conveyed slightly in the reverse direction, and the rear end of the paper sheet M is surely placed on the holding position on the receiving portion 42 of the feeding member 40. did.

  That is, the standby tray roller 32 is lowered and disposed at the operating position, the paper sheet M is clamped and restrained with the idle roller 33, and the standby tray roller 32 is slightly reversed. Thereby, the rear end of the paper sheet M is sent toward a stopper (not shown) and is brought into contact with the stopper. Then, the standby tray roller 32 is again retracted upward to release the restraint. As a result, even if the return amount of the paper sheet M is too large and the paper sheet M is bent, the bending is restored.

  Thereafter, the solenoid 62 is turned ON, and the pressing member 60 is rotated from the retracted position shown in FIG. 11B to the operating position shown in FIG. 11A, and as shown in FIG. The rear edge of the paper sheet M is pressed downward. At this time, since the pressing member 60 of the present embodiment has a width slightly smaller than the interval between the two receiving portions 42, a relatively strong shearing force is generated between the two receiving portions 42. Then, the rear end of the paper sheet M is clamped by a shearing force by being slightly bent as shown in FIG. In addition, since the relatively strong frictional force is applied to the rear end of the clamped paper sheet M by the rubber material 61 of the pressing member 60, the paper sheet M is not easily pulled out in this state. .

  Thus, in a state where the rear end of the first sheet M is clamped (the state shown in FIG. 11a), the second sheet M is fed to the standby tray 4 over the pressing member 60, and the rear The sheets are stacked and stacked on the first sheet M whose end is clamped. At this time, since the rear end of the first sheet M is clamped, even if the leading edge of the second sheet M in the feeding direction collides with the first sheet M, the first sheet The posture of the paper sheet M is not collapsed, and the two paper sheets M are normally accumulated. Further, the second sheet M does not sink under the first sheet M. In this case, since the rear end of the first sheet M is clamped by the pressing member 60, the second sheet M stacked over the pressing member 60 is accumulated in the first sheet. The paper sheets M are stacked in a shifted state.

  Thereafter, the open / close trays 4r and 4f are opened, and the feed member 40 is rotated as shown in FIG. 6 to release the support by the receiving portion 42 and the trailing edge of the paper sheet M is moved by the hitting portion 44. It is hit and dropped toward the processing tray 6. At this time, since there is nothing below the pressing member 60 that has pressed the first sheet M, when the support by the receiving portion 42 is lost, the rear end of the sheet M becomes free. Moreover, since the rear end of the second sheet M exceeds the pressing member 60, the pressing member 60 does not get in the way. Thereafter, the pressing member 60 is retracted to the retracted position at an appropriate timing.

  In order to secure a longer processing time in the processing tray 6, when three or more sheets M are to be waited on the standby tray 4, as described above, after the second sheet M is fed, the pressing member 60 is used. Is temporarily retracted, the standby tray roller 32 is brought into contact with the second sheet of paper and rotated reversely, the second sheet of paper M is aligned with the first sheet of paper M, and the pressing member 60 is again formed. Is rotated to the operating position to clamp the rear end of the two sheets M and accept the third sheet M. In this way, by constraining the trailing edge of the paper sheet M sent to the standby tray 4 each time, the stacking state of the paper sheet M can be improved and the paper sheet M can be stacked in a stable posture.

  By the way, when the two sheets M of the standby tray 4 are dropped, the width of the opening between the open / close trays 4r and 4f is widened toward the upstream in the feeding direction. The rear end side is first unsupported and is directed to the processing tray 6 from the rear end first as shown in FIG. At the same time, the center of the rear end of the paper sheet M is struck downward toward the processing tray 6 by the hitting unit 44, and the rear end of the paper sheet M is forcibly directed to the processing tray 6. Further, since the processing tray 6 is inclined, the above-described deviation is somewhat mitigated by the fall of the two sheets M.

  Thereafter, when the feeding member 40 is further rotated, as shown in FIG. 7, the vicinity of the rear end of the sheet M dropped on the processing tray 6 is scraped toward the stopper 50 by the paddle 46. At this time, the transport mechanism 34 is operated to transport the sheets M stacked on the processing tray 6 toward the stopper 50 in cooperation with the scraping operation of the paddle 46. The paddle 46 is elastically deformed as appropriate according to the thickness of the paper sheets M stacked on the processing tray 6.

  Further, as shown in FIG. 8, the feeding member 40 is rotated to the same posture (home position) as when the paper sheet M is received, and the next paper sheet M is fed to the standby tray 4. The rear end in the feed direction is supported by the receiving portion 42 of the feed member 40. By repeating the above operation, the paper sheets M in units of copies are stacked on the processing tray 6.

  Thereafter, when the paper sheets M in the number of copies are accumulated on the processing tray 6 and the rear ends are arranged, the stapler 8 provided so as to be movable along the rear ends is positioned at the staple position as shown in FIG. And paper sheets M in units of copies are bound at an appropriate position. The bundle of paper sheets M bound at the rear end in this way is transported toward the discharge trays 36 and 38 by operating the transport mechanism 34.

  As described above, according to the post-processing apparatus 1 of the present embodiment, when two sheets M are placed on standby in the standby tray 4, the rear end of the first sheet M is clamped 2 Since the first sheet M is received in the standby tray 4, the second sheet M collides with the first sheet M to cause a jam, or the first sheet It is possible to prevent problems such as the second sheet M submerged under M and the posture of the first sheet M collapsed due to the collision of the second sheet M. As a result, the paper sheets M can be stacked in a stable posture on the standby tray 4 and can be dropped to the processing tray 6 while maintaining a good stacking state. Can be surely stocked.

  In particular, according to the present embodiment, the paper sheet M sent to the standby tray 4 is slightly returned in the reverse direction and the rear end of the paper sheet M is securely placed on the receiving portion 42 of the feeding member 40. Since the holding member 60 is operated to hold the rear end, it is possible to prevent a problem that the stop position of the rear end is shifted due to the waist of the paper sheet M and is detached from the receiving portion 42, and the rear end is surely secured. Can be retained.

Next, a more detailed control operation by the post-processing apparatus 1 of the above-described embodiment will be described with reference to a block diagram shown in FIG.
The control unit 100 that controls the operation of the post-processing apparatus 1 controls the stop of the paper feed roller 31 with the detection of the passage of the rear end of the paper sheet M via the inlet sensor 3 as a trigger. At this time, the control unit 100 acquires information (paper information) on the paper size and thickness of the paper sheet M via a cassette sensor or the like (not shown), and the strength of the paper sheet M is low. Accordingly, the stop position is determined, and the motor 101 is controlled to stop the paper feed roller 31.

  For example, when a paper sheet M that is relatively weak is sent, the control unit 100 considers the amount of bending of the paper sheet M, and relatively increases the feed amount of the paper sheet M. On the other hand, when the relatively stiff paper sheet M is sent, the control unit 100 reduces the feed amount of the paper sheet M relatively. As a result, the rear end stop position can be controlled to substantially the same position for all types of paper sheets M.

  Further, the control unit 100 determines the strength of the paper sheet M based on the paper information, and controls the return amount of the paper sheet M by the standby tray roller 32. At this time, for example, the relatively weak paper sheet M is assumed to have a relatively long length from the nip between the standby tray roller 32 and the idle roller 33 to the rear end. Control is made to be relatively small, and for paper sheets M that are relatively stiff, conversely, the return amount is controlled to be relatively large. Thereby, the stop position of the rear end after returning the paper sheet M can be made constant regardless of the waist strength of the paper sheet M, and the rear end can be reliably clamped.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

  For example, in the above-described embodiment, a case has been described in which sheets M on which images are formed on copy paper are prepared and stapled. However, the present invention is not limited to this, and an apparatus that prepares other media such as mail and banknotes is used. The present invention may be applied.

1 is a schematic view showing a digital copying machine including a post-processing apparatus according to an embodiment of the present invention. The perspective view which shows the standby tray of the post-processing apparatus of FIG. The partial expansion perspective view which shows the feed member and pressing member which were provided between the standby tray and the processing tray. The front view of the feed member of FIG. Operation | movement explanatory drawing for demonstrating operation | movement by the feed member of FIG. 4, and the pressing member of FIG. Operation | movement explanatory drawing for demonstrating operation | movement by the feed member of FIG. 4, and the pressing member of FIG. Operation | movement explanatory drawing for demonstrating operation | movement by the feed member of FIG. 4, and the pressing member of FIG. Operation | movement explanatory drawing for demonstrating operation | movement by the feed member of FIG. 4, and the pressing member of FIG. Operation | movement explanatory drawing for demonstrating operation | movement of a stapler. Schematic which shows the clamped state of paper sheets when operating the pressing member of FIG. FIG. 4 is a schematic diagram (a) illustrating a state where the pressing member of FIG. 3 is rotated to an operating position, and a schematic diagram (b) illustrating a state where the pressing member of FIG. 3 is rotated to a retracted position. Operation | movement explanatory drawing for demonstrating the behavior of the paper sheets in a standby tray. The block diagram of the control system which controls operation | movement of a standby tray.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Post-processing apparatus, 4 ... Standby tray, 4r, 4f ... Opening / closing tray, 6 ... Processing tray, 6a ... Paper sheet mounting surface, 8 ... Stapler, 10 ... Digital copying machine, 32 ... Standby tray roller, 33 ... Idle roller, 40 ... feed member, 42 ... receiving portion, 44 ... striking portion, 46 ... paddle, 48 ... rotor, 50 ... stopper, 60 ... pressing member, 70 ... weight member, 61 ... rubber material, 62 ... solenoid, M: Paper sheets.

Claims (9)

A tray for collecting and stacking paper sheets,
A feeding mechanism that feeds paper sheets in the first direction toward the tray;
A receiving portion that receives and receives the rear end of the paper sheet fed into the tray along the first direction, and a holding mechanism that holds the rear end in cooperation with the receiving portion; ,
The paper sheets fed into the tray are slightly returned in a second direction opposite to the first direction, and the rear end of the paper sheets is disposed at a holding position between the receiving portion and the pressing member. A return mechanism to
After the paper sheets are fed into the tray, the rear end of the paper sheets is slightly returned to the second direction so as to be placed at the holding position, and the rear end of the paper sheets is held at the holding position. A control unit that controls the feeding mechanism, the holding mechanism, and the return mechanism so as to wait for the reception of the next paper sheet in the
A paper sheet processing apparatus comprising:   The paper sheet processing apparatus according to claim 1, wherein the tray is inclined downward along the second direction.   3. The paper sheet processing according to claim 2, further comprising a weight member that urges the rear end of the paper sheet that has passed through the feeding mechanism vertically downward by its own weight and drops the paper sheet toward the receiving portion. apparatus.   The paper sheet processing apparatus according to claim 3, wherein the control unit controls a feeding amount of the paper sheet by the feeding mechanism according to a type of the paper sheet fed to the tray.   The paper sheet processing apparatus according to claim 3, wherein the control unit controls a return amount of the paper sheet by the return mechanism in accordance with a type of the paper sheet fed into the tray.   The control unit controls the feeding amount of the paper sheet by the feeding mechanism according to the type of the paper sheet fed to the tray, and controls the returning amount of the paper sheet by the return mechanism. The paper sheet processing apparatus according to claim 3. A feeding step of feeding paper sheets along the first direction to the tray inclined upward in the first direction;
Placing and receiving a rear end of the paper sheet fed into the tray along the first direction on the receiving portion;
A step of returning the paper sheets fed to the tray in a second direction opposite to the first direction;
Holding the rear end from above with a pressing member, and holding the rear end in cooperation with the receiving portion;
A paper sheet processing method characterized by comprising:   2. The method according to claim 1, further comprising a step of causing a weight member to act on the paper sheet fed to the tray in the feeding step so as to urge and drop the rear end of the paper sheet toward the receiving portion. 8. The paper sheet processing method according to 7.   8. The paper sheet according to claim 7, further comprising a step of feeding the next paper sheet to the tray along the first direction after holding the trailing edge of the paper sheet in the holding step. Kind processing method.

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