JP4575884B2 - Paper post-processing device - Google Patents

Description

  The present invention relates to a sheet post-processing apparatus, and more particularly to a sheet post-processing apparatus that reduces catching of the trailing edge of a sheet.

  The paper on which the image is formed by the image forming apparatus is sent to a paper post-processing device, and post-processing such as sorting or stapling is performed. In the sheet post-processing apparatus, a transport route is selected according to the type of post-processing and the number of processed sheets. For example, one end side of the paper is pulled in and aligned in the vertical or horizontal direction of the paper, and then conveyed to the discharge port side.

Generally, a guide member for smoothly transporting a sheet is disposed on the transport route. In some cases, a plurality of paddles that are used in combination with a guide member to forcibly carry a sheet while rotating are provided. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 10-279160

  The outer side of the plurality of paddles is only a rubber plate that scrapes off the paper, and there is nothing that closes the square hole of the paper guide into which the rubber plate enters. On the other hand, paper sizes handled in the paper post-processing are various.

  For this reason, for example, in the case of a B4 or B5 size sheet, both ends of the sheet are substantially close in size, and therefore, there is a problem of being caught in a square hole and jamming.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a paper post-processing apparatus that solves the above-described problems and prevents catching at both ends of the rear end.

According to one aspect of the present invention, there is provided a sheet post-processing apparatus that receives a sheet on which an image has been formed by an image forming apparatus and performs post-processing such as stapling and sorting, and is attached to a rotating shaft and conveyed. A plurality of paddles to be scraped to the next transport route, and the transported paper is pulled from one end side and transported to the transport path in pairs with the paddle, and the paddle is rotatable In this way, the sheet guide is formed with a notch that matches the outer shape of the paddle, and is formed at a predetermined rotation angle with the paddle, and is rotated to the position of the notch at a predetermined timing. And a projecting member disposed on the rotating shaft so as to prevent the insertion into the notch .

  The paper guide conveys paper to a processing tray on which the paper is stacked.

  A pedestal for receiving the rear end of the sheet is formed at the center of the rotating shaft.

  The projecting member receives a rear end of the sheet together with the cradle part.

  According to the present invention, even when the rear end of the sheet is likely to enter the square hole portion, it is prevented, and it is possible to prevent catching or twisting of various sizes of paper, and it is possible to increase the throughput of the paper post-processing. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is a perspective view showing a main part of a sheet post-processing apparatus 7 according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram showing a sheet post-processing apparatus 7 disposed adjacent to an image forming apparatus 5 such as a copying machine. is there.

The sheet post-processing device 7 basically includes a standby tray 10, a processing tray 12, a stapler 14, a first discharge tray 16, and a second discharge tray 18.

  A sheet P formed by an image forming apparatus 5 such as a copying machine and discharged from a pair of paper discharge rollers 6 is received by a pair of entrance rollers 22 and supplied to a pair of paper feed rollers 24 for supply. It is sent from the paper roller 24 to the standby tray 10. The entrance roller 22 is driven by an entrance roller motor 26. A paper path ceiling 36 for guiding the paper P to the paper feed roller 24 is provided between the entrance roller 22 and the standby tray 10. The entrance roller 22 includes an upper entrance roller 22a and a lower entrance roller 22b. The paper feed roller 24 also includes an upper paper feed roller and a lower paper feed roller.

  Below the standby tray 10 is disposed a processing tray 12 on which the sheets P dropped from the standby tray 10 are stacked.

  The processing tray 12 aligns and supports the stacked paper P while the paper P is stapled by the stapler 14 which is a processing mechanism that performs post-processing.

  As shown in FIG. 3, the stapler 14 is positioned by the staple driving unit 49, and the staple processing is controlled. The processing tray 12 has a pair of upper and lower upper alignment rollers 38a and a lower vertical alignment roller 38b shown in FIG. 6 for aligning a plurality of sheets P dropped and supplied from the standby tray 10 in the vertical direction as the transport direction. . The vertical and vertical alignment rollers 38 a and 38 b also serve as a bundle conveying roller that sandwiches the sheet bundle T after the stapling process and picks it up from the stapler 14. The upper vertical alignment roller 38a is driven by a vertical alignment upper roller motor 40, and the lower vertical alignment roller 38b is driven by a vertical alignment lower roller motor 42.

  Further, at the position where the trailing edge of the paper P falls when the paper P is dropped and supplied to the processing tray 12, it can be rotated to align the uppermost paper P placed on the processing tray 12 in the vertical direction. A paddle 44 is disposed. As shown in FIG. 7, the paddle 44 aligns the receiving portion 44 a of the paper P that is dropped and supplied onto the processing tray 12, the punching portion 44 b that scrapes off the paper P on the processing tray 12, and the paper P on the processing tray 12. It has a feed portion 44 c and is driven by a paddle motor 46. The paddle 44 is made of a rubber material and has elasticity.

  FIG. 8 is a schematic diagram showing the vicinity of the sheet guide 52 that draws the sheet from one end and conveys it to the processing tray 12, for example. The sheet guide 52 pulls the conveyed sheet from one end, for example, from the rear end, and conveys the sheet to the conveyance path in a pair with the paddle 44.

  As shown in FIG. 8, a plurality of paddles 44 are attached to a rotating shaft 54 arranged in parallel with the paper guide 52 to scrape the conveyed paper to the next transport route.

  The paper guide 52 is formed with a notch 52a that matches the outer shape of the paddle 44 so that the paddle 44 can rotate.

  The rotating shaft 54 is provided with a plurality of protruding members 56 that are large enough to close the notches 52a. The protruding member 56 is formed at a predetermined rotation angle with the paddle 44, for example, 45 degrees to 90 degrees.

  FIG. 9 shows a state in which the paddle 44 and the protruding member 56 are rotated and the protruding member 56 has come to a position where the notch 52a is blocked. That is, the protruding member 56 attached to the rotary shaft 54 closes the notch 52 a formed in the paper guide 52 at the timing when the paper is conveyed to the next processing route along the surface of the paper guide 52. It will be.

  A pedestal 52b for receiving the rear end of the paper is preferably formed at the center of the rotating shaft 54. This is because the holding of the sheet is ensured.

  The projecting member 56 can receive the rear end of the sheet together with the cradle part 52b. However, by using the cradle part 52b and the projecting member 56 together, the number of parts can be reduced.

  A stopper 45 is provided at the end of the processing tray 12 on the side of the stapler 14 to abut the rear end of the paper P and regulate the rear end position. Near the center of the processing tray 12, there is a conveying belt 50 that carries the stapled and the sheet bundle T taken out from the stapler 14 by the vertical and vertical alignment rollers 38a and 38b to the first or second discharge trays 16 and 18. Provided. A feed claw 50 a that hooks the rear end of the sheet bundle T is attached to the transport belt 50.

    As shown in FIG. 2, the standby tray 10 can supply the paper P to the processing tray 12 while being transported in the direction of the first or second paper discharge tray 16 or 18. The conveyance of the paper P in the direction of the paper discharge trays 16 and 18 is performed by bringing the standby tray roller 28 that aligns the paper P into contact with the paper P on the standby tray 10. The standby tray roller 28 is controlled to move up and down by a standby tray roller drive source 30.

    The standby tray 10 is disposed so as to have an inclination angle θ1 in order to support the paper P in a state where the leading edge of the paper P is higher than the rear end. The first or second paper discharge tray 16 or 18 is lifted or lowered by the paper discharge tray driving unit 52 to select either one. The first or second paper discharge trays 16 and 18 are raised and lowered to substantially the same height as the standby tray 10 or the processing tray 12 when the paper P is stacked to improve the consistency of the paper P to be discharged. The first or second paper discharge trays 16 and 18 are arranged at an inclination angle θ2 to support the paper P with the leading edge of the paper P being higher than the trailing edge.

  During the period from the standby tray 10 to the processing tray 12, when the paper P on the standby tray 10 is dropped and supplied to the processing tray 12, the paper P is prevented from being disturbed in the lateral direction perpendicular to the transport direction. Lateral alignment plates 47a and 47b shown in FIG. The lateral alignment plates 47a and 47b are formed to be slidable so as to be adjusted to the width of the paper P by the lateral alignment motor 48.

  Next, the operation will be described. When an image is formed by the image forming apparatus 5 and the paper P is supplied from the paper discharge roller 6, the paper post-processing device 7 performs the post-processing when the paper P is post-processed or not. Different operations are performed depending on whether the process is being executed or the post-processing is finished.

  When the post-processing is not performed, for example, the first paper discharge tray 16 is slid to the position indicated by the dotted line in FIG. 2, and the paper P discharged from the standby tray 10 can be stacked with good consistency. When no post-processing is performed, the paper P conveyed from the entrance roller 22 to the paper feed roller 24 through the paper path ceiling 36 is fed to the standby tray 10 by the paper feed roller 24. Next, the paper P is transported by the standby tray roller 28 that is lowered onto the standby tray 10 and rotated in the direction of the arrow f, and is discharged onto the first paper discharge tray 16.

  In this way, the sheets are sequentially stacked on the first paper discharge tray 16. The first paper discharge tray 16 is arranged so that the inclination angle is θ2, and the front end of the paper is higher than the rear end. For example, the paper P is curled in a mountain as shown by the dotted line in FIG. Even if the paper is discharged onto the first paper discharge tray 16 in the state, the paper P placed on the first paper discharge tray 16 in advance is pushed out by contact with the leading edge of the subsequent paper P. There is no. That is, the discharged paper P is sequentially placed on the first paper discharge tray 16 without being out of order. Even if the preceding paper P is pushed by the succeeding paper P and is slightly misaligned, the paper P falls by its own weight on the first paper discharge tray 16 due to the inclination angle θ2. The rear ends are aligned and loaded.

  Here, when the paper on which the image is formed is received by the image forming apparatus 5 and post-processing such as stapling and sorting is not performed, the paper discharge tray 16, until a predetermined number of sheets are discharged from the paper post-processing apparatus 7. 18 does not perform any vertical movement. The number of discharged sheets can be counted by, for example, a sheet upper surface detection sensor (not shown) that detects the upper surface of the sheet.

  When the number of sheets stacked on the discharge trays 16 and 18 reaches a predetermined number, the sheet discharge trays 16 and 18 are moved up and down to be fed to a sheet discharge port (not shown) of the sheet post-processing device 7. Accurate upper surface detection is performed by avoiding the remaining rear end.

  After the predetermined number of sheets has been reached, it is preferable to maintain the stationary state of the paper discharge trays 16 and 18 until the sheet upper surface detection sensor is turned on for a predetermined time or longer, for example, 5 msec or longer. This is because the presence of a dead zone is unavoidable for actuators such as various sensors.

  Here, the reason why the upper surface of the sheet is detected is to manage so as not to exceed the number of sheets that can be stacked on the discharge trays 16 and 18, and to grasp the current movable position of the discharge trays 16 and 18.

  The set number of sheets may be set to, for example, 40 sheets as a default at the time of shipment of the sheet post-processing apparatus 7, or may be settable by the user.

  The stroke amount of the vertical movement of the discharge trays 16 and 18 is at least about 50 mm. This is because the trailing edge of the paper cannot be removed when the stroke amount is too small. On the other hand, if the stroke amount is too large, it takes time to move up and down the paper discharge trays 16 and 18, resulting in poor productivity.

  The stroke amount of the vertical movement of the paper discharge trays 16 and 18 may be set as a default when the paper post-processing device 7 is shipped, or can be set by the user.

  It is preferable that the vertical movements of the paper discharge trays 16 and 18 are faster when they are lowered than when they are raised. This is because the paper falls to the paper discharge trays 16 and 18 earlier.

  Next, a case where a stapling process as a post-process is performed and there is no sheet P on which the stapling process is being executed prior to the processing tray 20 will be described.

  In this case, the standby tray 10 drops and supplies the paper P onto the processing tray 12. Further, as shown in FIG. 7, the horizontal alignment plates 47a and 47b are arranged so that the width between the horizontal alignment plates 47a and 47b is substantially the same as that of the paper P in order to align the horizontal direction of the paper P to be dropped. . As a result, the paper P fed by the paper feed roller 24 is dropped and supplied onto the processing tray 12 via the standby tray 10.

  At the time of dropping, the upper vertical alignment roller 38a is retracted upward, and the receiving portion 44a of the paddle 44 receives the rear end of the paper P. Both sides of the paper P fall while contacting the horizontal alignment plates 47a and 47b, and are aligned in the horizontal direction. Next, the paddle 44 rotates in the direction of the arrow o, the trailing edge of the paper P is dropped from the receiving portion 44a, and is knocked onto the processing tray 12 by the knocking portion 44b. Further, the paddle 44 feeds the paper P in the direction of the arrow q by the feeding portion 44c, and the rear end of the paper P is brought into contact with the stopper 45 to complete the vertical alignment of the paper P. The vertical alignment of the paper P on the processing tray 12 may be performed by the upper vertical alignment roller 38a by moving the upper vertical alignment roller 38a up and down each time.

    In this way, the paper P on which the image has been formed is stacked on the processing tray 12 from the paper feed roller 24 via the standby tray 10 while being sequentially aligned in the horizontal and vertical directions. When the number of sheets P reaches a predetermined number, the stapler 14 staples the sheets P on the processing tray 12 at a desired position to form a bundle of sheets T. Thereafter, the upper vertical alignment roller 38a is lowered onto the sheet bundle, and the sheet bundle T is sandwiched between the upper vertical alignment roller 38a rotating in the direction of arrow r and the lower vertical alignment roller 38b rotating in the direction of arrow s. The sheet is conveyed in the direction of the paper discharge tray 16.

  When the rear end of the sheet bundle T passes through the vertical and vertical alignment rollers 38 a and 38 b, the sheet bundle T is caught on the feeding claw 50 a of the conveyance belt 50 rotated in the direction of the arrow t and bundled on the first paper discharge tray 16.

    At this time, the first paper discharge tray 16 is slid from the position indicated by the dotted line in FIG. 2 to the position indicated by the solid line. The first paper discharge tray 16 is arranged so that the inclination angle is θ2, and the front end of the paper is higher than the rear end, so that the paper bundled on the first paper output tray 16 in advance is bundled. P is not pushed out by contact with the leading end of the subsequent sheet bundle T. Even if the preceding sheet bundle T is slightly misaligned by the succeeding sheet P, the sheet bundle T falls due to its own weight on the first discharge tray 16 because of the inclination angle θ2. The stapling process of the paper P stacked in a state where the rear ends are aligned is completed.

    Next, a case where the stapling process as the post-process is performed and the sheet P on which the stapling process is being executed remains on the processing tray 20 will be described.

  In this case, the sheet P can be supported in the standby tray 10. The standby tray roller 28 is retracted above the standby tray 10 so as not to interfere with the paper P. The paper P discharged from the image forming apparatus 5 and supplied by the paper feed roller 24 is temporarily placed on the standby tray 10 in order to wait for the processing tray 12 to become empty.

    The paper P placed on the standby tray 10 is vertically aligned by the standby tray roller 28 rotated in the direction opposite to the arrow f direction. Further, since the standby tray 10 is arranged so that the inclination angle is θ1, and the leading end of the sheet is higher than the trailing end, the sheet P is vertically aligned by its own weight.

  Further, since the standby tray 10 is arranged so that the inclination angle is θ1, even if the paper P is supplied from the paper supply roller 24 in a curled state and fed onto the standby tray 10, for example, The paper P placed on the standby tray 10 in advance is not pushed out by contact with the leading edge of the subsequent paper P. That is, the supplied paper P is sequentially placed on the standby tray 10 without being out of order. Even if the preceding paper P is pushed by the succeeding paper P and is slightly misaligned, there is an inclination angle θ1, so the paper P falls due to its own weight, and the trailing edge of the standby tray 10 is It is loaded in line with the aligned state.

    During this time, when the preceding paper P on the processing tray 12 is discharged to the first paper discharge tray 16 side and the processing tray 12 becomes empty, the standby tray 10 drops and supplies the paper P onto the processing tray 12. At this time, the interval between the lateral alignment plates 47a and 47b is arranged to be substantially the same width as the paper P. Accordingly, the sheet P dropped from the standby tray 10 is regulated in the lateral direction by being regulated by the lateral alignment plates 47a and 47b on both sides.

    The lower sheet P of the two sheets P dropped on the processing tray 12 is sent in the direction of the arrow q by the lower vertical alignment roller 38b rotated in the direction opposite to the direction of the arrow s, and the rear end of the sheet P is stopped by the stopper. 45, the vertical alignment of the paper P is completed. The upper sheet P of the two sheets P dropped on the processing tray 12 is sent in the direction of the arrow q by the upper vertical alignment roller 38a rotated in the direction opposite to the direction of the arrow r, and the trailing end of the sheet P is stopped at the stopper 45. The vertical alignment of the paper P is completed, and then the upper vertical alignment roller 38a is retracted upward.

    The third and subsequent sheets P discharged from the image forming apparatus 5 are directly dropped onto the processing tray 12 without waiting on the waiting tray 10. Thereafter, the third and subsequent sheets P are sequentially aligned on the sheet P loaded on the processing tray 12 by the paddle 44 first.

    When the number of sheets P stacked on the processing tray 12 reaches a predetermined number, the stapler 14 performs a stapling process to form a sheet bundle T. Thereafter, the sheet bundle T is conveyed in the direction of the first sheet discharge tray 16 by the vertical and vertical alignment rollers 38a and 38b, and the rear end of the sheet bundle T is hooked on the feed claw 50a of the conveyance belt 50. Bundled up, the stapling process for the paper P is completed.

    When the paper is transported from the standby tray to the processing tray, the paper can be moved quickly and quietly without disturbing the alignment of the paper, so that the throughput of the paper post-processing can be increased.

  Further, by providing the standby tray 10 with the inclination angle θ1, it is possible to align the paper P on the standby tray 10 by its own weight, and there is a possibility that the paper P previously placed may be pushed out by the subsequent paper P. In addition, the consistency of the sheets P on the standby tray 10 can be improved, jamming of the sheets P can be prevented, and the order of placing the sheets on the standby tray 10 can be prevented. Similarly, by providing the first or second paper discharge trays 16 and 18 with an inclination angle θ2, the paper P or the paper bundle placed prior to the first or second paper discharge trays 16 or 18 is provided. There is no fear that T will be pushed out by the subsequent paper P or the paper bundle T, the consistency of the paper P on the first or second paper discharge trays 16 and 18 can be improved, and jamming of the paper P can be prevented. Alternatively, it is possible to prevent the placement order of the paper P or the paper bundle T on the second paper discharge trays 16 and 18.

    According to the above-described embodiment, the protruding member attached to the rotation shaft is formed on the paper guide at the timing when the paper is transported to the next processing route along the surface of the paper guide. This prevents the paper from entering the cutout.

    The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

    In the present invention, stapling is described as the post-processing performed on the sheets stacked on the processing tray. However, this post-processing is not limited to the case where stapling is performed, and there is no problem even in post-processing such as performing hole punching (punching) processing on a sheet. In this case, there is no problem even if the sheets stacked on the processing tray are not a plurality of sheets but a single sheet. Further, it goes without saying that the present invention is effective even for an aftertreatment apparatus having such an aftertreatment mechanism.

It is a perspective view which shows the principal part of the paper post-processing apparatus which concerns on one Embodiment of this invention. It is a schematic block diagram which shows the paper post-processing apparatus which concerns on one Embodiment of this invention. 1 is a perspective view showing a stapler of a paper post-processing apparatus according to an embodiment of the present invention. It is a perspective view which shows the vertical alignment roller which concerns on one Embodiment of this invention. It is explanatory drawing which shows the paddle which concerns on one Embodiment of this invention. It is a schematic perspective view which shows the horizontal alignment board and conveyance belt which concern on one Embodiment of this invention. It is explanatory drawing which shows the state by which the paper on the standby tray or paper discharge tray which concerns on one Embodiment of this invention is extruded. FIG. 5 is a schematic diagram showing the vicinity of a paper guide that transports paper by drawing it from one end. FIG. 5 is a schematic diagram showing the vicinity of a paper guide that transports paper by drawing it from one end.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 5 ... Image forming apparatus, 7 ... Paper post-processing apparatus, 10 ... Standby tray, 12 ... Processing tray, 14 ... Stapler, 16 ... First discharge tray, 18 ...・ Second discharge tray, 22 ... Inlet roller, 22a ... Upper entrance roller, 22b ... Lower entrance roller, 24 ... Feeding roller, 26 ... Inlet roller motor, 28 ... Standby tray roller, 30 ... standby tray roller drive source, 32 ... standby tray roller motor, 33 ... belt, 34 ... standby tray motor, 36 ... paper path ceiling, 38a ... vertical Alignment roller, 38b ... Lower vertical alignment roller, 40 ... Vertical alignment upper roller motor, 42 ... Vertical alignment lower roller motor, 44 ... Paddle, 45 ... Stopper, 46 ... Paddle motor , 47 ... Lateral alignment plate, 48 ... Lateral alignment motor, 49 ... Staple drive unit, 50 ... Conveyor belt, 50a ... Feeding claw, 52... Paper guide, 54.

Claims (5)

A paper post-processing device that accepts paper image-formed by an image forming apparatus and performs post-processing such as stapling and sorting,
A plurality of paddles attached to the rotary shaft and scraping the conveyed paper to the next transport route;
The transported paper is pulled from one end side and transported to the transport path in pairs with the paddle, and a notch that matches the outer shape of the paddle is formed so that the paddle can rotate. Paper guides,
It is formed at a predetermined rotation angle with the paddle, and is disposed on the rotation shaft so as to rotate to a position of the notch at a predetermined timing and prevent the sheet from being inserted into the notch. A protruding member,
A sheet post-processing apparatus comprising:   2. The sheet post-processing apparatus according to claim 1, wherein the sheet guide conveys sheets to a processing tray on which the sheets are stacked.   The sheet post-processing apparatus according to claim 1, wherein a receiving portion for receiving a rear end of the sheet is formed at a central portion of the rotation shaft.   The sheet post-processing apparatus according to claim 1, wherein the protruding member receives a sheet rear end together with the cradle part.   The sheet post-processing apparatus according to claim 1, wherein the predetermined rotation angle is 45 degrees to 90 degrees.

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