JP4660506B2 - Sheet post-processing apparatus and image forming system having the same - Google Patents

Description

  The present invention relates to a sheet post-processing apparatus that performs binding processing or folding processing by aligning sheets conveyed from an image forming apparatus such as a copying machine or a printer into a bundle, and an image forming system including the same. The present invention relates to improvements in mechanisms and folding mechanisms.

  2. Description of the Related Art Generally, a post-processing apparatus that aligns sheets conveyed from an image forming apparatus or the like and staples the sheet bundle and folds it into a booklet shape or folds without stapling is widely known. Such a post-processing apparatus is used, for example, as a system apparatus such as a bookbinding process connected to a paper discharge port of an image forming apparatus.

  For example, Patent Document 1 discloses an apparatus that stacks sheets from an image forming apparatus in a conveyance path, staples the central portion of the sheet bundle, and then folds the center into a crease and stores it in a stacker. . This publication discloses an apparatus configured to move up and down in the path a stopper member that regulates the leading edge of the sheet in order to move the sheets accumulated in the path to the binding position and the folding position.

Further, in Patent Document 2, a flapper member is provided at a sheet carry-in entrance in order to prevent a subsequent sheet from entering between the preceding sheets and causing a disorder when stacking and stacking sheets in a path. An apparatus configuration for guiding sheets onto the stacked sheets is disclosed.
JP 2006008384 A JP-A-2005-041660

  When the sheets are stacked and stored in the path in which the sheet folding mechanism is arranged in the sheet folding apparatus as described above, when the preceding sheet is loaded into the path and the subsequent sheet is loaded from the rear end side as in Patent Document 1 described above. It is known that this sheet enters between the preceding and stacked sheets and causes disorder. In particular, when the front end of the sheet is regulated in order to position the stacked sheets at a predetermined folding position or staple binding position, in the case of a sheet having a different length size, for example, a short sheet, there is a gap between the rear end of the sheet and the rear end of the succeeding sheet. Arise. For this reason, it is not possible to guide the leading edge of the succeeding sheet onto the accumulated sheet, and the page order is likely to be out of order. For this reason, conventionally, a mechanism is used in which sheets are stacked in a bundle on the upstream side different from the sheet folding position or binding position and then conveyed to the binding position or folding position.

  In view of the above, Japanese Patent Application Laid-Open No. 2004-228620 proposes a mechanism for providing a flapper member for observing the order of sheets accumulated at the sheet carry-in port. According to this publication, a flapper member is suspended from a sheet carry-in entrance onto a stacking guide to guide the sheet, and after the sheet is loaded, the entire sheet is fed in the conveying direction and then switched back to overlap the flapper member. A mechanism for carrying in the next sheet is disclosed. In other words, this publication provides a flapper member that guides the sheet in order to comply with the sheet order, and at the same time, moves the entire sheet back and forth with a sheet leading edge regulating member to lower the trailing edge of the sheet guided by the flapper member ( A mechanism that moves up and down has been proposed (see FIG. 9).

  However, if the guide mechanism such as a flapper and the sheet position regulating mechanism for adjusting the rear end position of the stacked sheets are arranged at the sheet carry-in entrance as in the above-mentioned Patent Document 2, there is a disadvantage that the apparatus becomes complicated. That is, each time a sheet bundle accumulated on the accumulation guide is carried in from the carry-in entrance, the already accumulated sheet bundle is offset and moved in the front and rear directions, and the mechanism becomes complicated. At the same time, in the case of a sheet that is continuously fed out from the carry-in entrance, there are various problems in terms of operation time, timing, and control mechanism to offset the sheet bundle forward and backward in the carrying direction each time the sheet is carried in.

  Accordingly, the present inventor has come to the knowledge that a guide member is provided at the sheet carry-in entrance, and the sheet lowering operation that is fed out by the guide member can be performed without moving the sheet on the integrated guide back and forth. Then, the guide member of the sheet carry-in port is configured to be elastically deformable or axially rotatable, and swiveled so as to pass the sheet bundle, thereby lowering the rear end of the sheet loaded along the guide for loading the next sheet. It was possible to come up with the idea that the above problem could be solved by such means.

  Therefore, according to the present invention, when sheets are stacked at the post-processing position, the sheet jam or the page order does not get out of order, and the stacked sheet bundle can be accurately positioned at the subsequent binding processing or folding processing position. The main problem is to provide a sheet folding apparatus with a simple structure at low cost.

To achieve the above object, the present invention employs the following configuration.
A sheet carry-in path for feeding the sheet from the carry-in port to the downstream post-processing position from the paper discharge port, and a step formed on the downstream side of the paper discharge port to arrange the sheets in a bundle. Stacking guide means, post-processing means for performing binding processing and / or folding processing on a bundle of sheets stacked on the stacking guide means, and sheet tip regulation means for positioning and regulating the leading end position of the sheets stacked on the stacking guide means With. The sheet leading edge restricting means is configured to be movable in accordance with the sheet size so that the rear end of the sheet supported by the stacking guide means is located at a predetermined position below the sheet discharge port, and the sheet carry-in path is discharged. A guide member for guiding the carry-in sheet onto the uppermost sheet supported by the accumulation guide means is provided at the paper mouth .

The guide member includes a pivot guide member whose base end is pivotally supported so as to be pivotable above the integrated guide means, and a distal guide member pivotally coupled to the distal end of the pivot guide member. The rotating guide member is connected to a driving means for rotating about the base end portion. The rotating guide member is rotated by the driving means , so that the distal end guide member is carried in. From the operating position for guiding the sheet onto the uppermost sheet, the sheet is swung so as to be bent by the paper surface of the uppermost sheet, and then returned onto the carry-in sheet.

  The post-processing means includes folding roll means disposed at a sheet folding position of the stacking guide means, and the stacking guide means is constituted by a curved or bent sheet placing guide, and the sheet placing guide is a sheet. The folding position is supported so that the folding position protrudes toward the folding roll means.

  The post-processing unit includes a stapling unit that binds the sheet bundle stacked on the stacking guide unit and a folding roll unit that folds the sheet bundle, and the stacking guide unit has the above-described sheet binding position on the upstream side. The stapling means sequentially arranges the folding roll means in this order at the downstream sheet folding position, and the stacking guide means comprises a curved or bent sheet placement guide. This sheet placement guide is supported in a warped posture so that the sheet folding position protrudes toward the folding roll means.

During the stapling operation for binding the sheet bundle supported by the sheet placement guide by the stapling means, the guide member presses and holds the rear end portion of the sheet bundle on the sheet placement guide.

  The sheet leading edge regulating means includes a locking member that latches the sheet leading edge and a grip member that grips the sheet. The sheet gripping member moves at least the sheet bundle on the sheet placement guide from the binding position to the folding position. In this case, the front end of the sheet bundle is gripped.

  An image forming system according to the present invention includes an image forming apparatus that sequentially forms an image on a sheet, and a sheet post-processing apparatus that performs binding processing and / or folding processing on the sheet from the image forming apparatus. The processing apparatus has the above-described configuration.

In the present invention, when a sheet is carried from the sheet discharge port to the stacking guide on the downstream side and stacked, the rear end portion of the sheet supported on the guide by the front end regulating unit faces a predetermined position below the sheet discharge port, this together with the guide member and the proximal end is rotatably shaft support provided on the entrance, the distal end portion of the guide member on the loading sheet after evacuated to the sheet out along the plane of the uppermost sheet stacking guide Since it is configured to pivot so as to return, the following effects are obtained.

The sheets stacked on the stacking guide are aligned at a predetermined position at the rear end of the discharge port side, and a guide member with the front end facing this position guides the carry-in sheet from the discharge port onto the stacked sheet. The sheets can be aligned on the stacking tray in a state where the sheet order is ensured. At the same time, even if the trailing edge of the sheet accumulated on the stacking guide curls and warps upward, the sheet from the sheet discharge port is not caught by this, and jamming at the time of carrying in the sheet does not occur.

  The leading edge restricting means arranged in the stacking guide does not need to be moved back and forth in the conveying direction every time a sheet is carried in, and can continuously stack sheets that are continuously carried out. Compared with a mechanism that moves back and forth each time, it is simple and easy to control.

  Further, according to the present invention, the accumulation guide is constituted by a curved or bent guide, and the stacked sheets can be supported so as to be warped in a state of protruding toward the folding roll means or the binding means. In other words, there is no need to move the sheets (bundles) on the guide back and forth every time the sheets are carried in, so there is no risk of wrinkles or irregularities in the sheets. In this way, the sheets are bound in an accurate position by accumulating in a curved shape. Alternatively, folding processing can be performed.

  The present invention will be described in detail below based on the preferred embodiments shown in the drawings. FIG. 1 shows the overall configuration of an image forming system according to the present invention, FIG. 2 is an explanatory diagram of the overall configuration of a post-processing apparatus, and FIG. 3 is an explanatory diagram showing the detailed configuration of a sheet carry-in unit.

The image forming system shown in FIG. 1 includes an image forming apparatus A and a post-processing apparatus B. The post-processing apparatus B incorporates a sheet folding apparatus C as a unit.
[Configuration of Image Forming Apparatus]
The image forming apparatus A shown in FIG. 1 sends a sheet from the sheet feeding unit 1 to the image forming unit 2, prints the sheet on the image forming unit 2, and then carries the sheet out from the main body discharge port 3. The sheet feeding unit 1 stores sheets of a plurality of sizes in sheet feeding cassettes 1 a and 1 b, and separates designated sheets one by one and feeds them to the image forming unit 2. The image forming unit 2 includes, for example, an electrostatic drum 4, a print head (laser light emitting device) 5 and a developing device 6 arranged around the electrostatic drum 4, a transfer charger 7, and a fixing device 8. An electrostatic latent image is formed by the light emitting device 5, toner is adhered to the developing device 6, an image is transferred onto the sheet by the transfer charger 7, and heat fixing is performed by the fixing device 8. The sheets on which images are formed in this way are sequentially carried out from the main body discharge port 3. 9 is a circulation path, and the sheet printed on the front side from the fixing device 8 is turned upside down through the main body switchback conveyance path 10 and then fed again to the image forming unit 2 to be printed on the back side of the sheet. This is the path for duplex printing. The sheet printed on both sides in this way is turned upside down in the main body switchback conveyance path 10 and then carried out from the main body discharge port 3.

  11 is an image reading apparatus, which scans an original sheet set on a platen 12 with a scan unit 13 and projects it onto a photoelectric conversion element 14 via a lens optical system. The image processing unit photoelectrically converted by the photoelectric conversion element is subjected to digital processing, for example, and then transferred to a data storage unit (such as a hard disk) 17 of the image forming apparatus A. The image forming apparatus A reads the image data from the data storage unit 17 and sends an image signal to the laser emitter 5 described above. Reference numeral 15 denotes a document feeding device, which is a feeder device that feeds a document sheet stored in the stacker 16 to the platen 12 of the image reading device.

The image forming apparatus A configured as described above is provided with a control unit (controller) shown in FIG. 14 , and image forming conditions such as sheet size designation, color / monochrome printing designation, print number designation, single-sided / double-sided printing designation from the control panel 18. The printout conditions such as enlargement / reduction print designation are set. On the other hand, in the image forming apparatus A, image data read by the image reading apparatus 11 or image data transferred from an external network is accumulated in the data storage unit 17, and the image data is stored in the buffer memory 19 from the data storage unit 17. The data signal is sequentially transferred from the buffer memory 19 to the laser emitter 5.

[Description of image formation order]
From the control panel 18, post-processing conditions are also input and specified simultaneously with the image forming conditions. As the post-processing conditions, for example, “print-out mode”, “staple binding mode”, “sheet bundle folding mode”, or the like is designated. The image forming apparatus A forms an image on the sheet according to the image forming condition and the post-processing condition. These image forming conditions are appropriately set according to the apparatus configuration and apparatus specifications of the image forming apparatus A, and since various configurations are already known, the description thereof will be omitted.

  Next, an image forming order generally used in a sheet folding apparatus (unit) to be described later will be described for this image forming method. An image forming order in the case of a magazine binding process in which a series of sheets on which images have been formed are aligned in a bundle and a booklet binding process and a folding process are performed will be described. In such a magazine binding process, “double-sided printing” is set as the image forming condition, “sheet bundle folding mode” is set as the post-processing condition, and “2 in 1 printing (the first column in the right column of one sheet) is set. The case where “the mode in which the first image is formed in the left column and the second image is formed” will be described with reference to FIG.

  In the image forming apparatus A, when the last page is n pages (a multiple of 4), the image of the (n / 2) page and the image of the (n / 2 + 1) page are displayed on the back side of the first sheet. The image of the (n / 2-1) page and the image of the (n / 2 + 2) page are formed and carried out from the main body discharge port 3. This sheet is carried into the sheet carry-in path P1 of the post-processing apparatus B with the surface on which the image is finally formed up. When the sheet thus carried in is heat-fixed, it tends to be carried in by curving (curling) upward as shown in the figure. Thus, the post-processing apparatus B is configured to correct this curl when the sheet is stored in a collection guide (sheet guide; hereinafter the same) 35 described later from the sheet carry-in path P1.

  Next, the image forming apparatus A prints the (n / 2-2) page image and the (n / 2 + 3) page image on the front side of the next sheet, and the (n / 2-3) page on the back side. And the (n / 2 + 4) th page image are printed out from the main body discharge port 3. Then, the post-processing apparatus B stacks and accumulates the sheets on the previous sheet (previous sheet) accumulated in the accumulation guide 35. As described above, the image forming apparatus A forms an image in an order suitable for the stacking method (stacking order of top stacking or bottom stacking) of the subsequent post-processing apparatus B. The page order in the case of image formation controls the order of data transmitted to the print head (laser emitter) 5 by calculating the order of printing when transferring image data from the data storage unit 17 to the buffer memory 19. Then, the post-processing apparatus B stacks the sheets from the sheet carry-in path P1 on the accumulation guide 35 and stores them in a bundle shape. At this time, as shown in FIG. 4, the sheet on which the image is formed is conveyed in a U-shape curvedly into the sheet carry-in path P1, and is collected from a second switchback conveyance path SP2 (sheet carry-in path), which will be described later. ). The stacking guide 35 is constituted by a bent or curved guide plate, and the loaded sheets are sequentially stacked in an upwardly U-curved state.

[Configuration of post-processing equipment]
The post-processing apparatus B connected to the image forming apparatus A will be described. The post-processing apparatus B receives a sheet on which an image has been formed from the main body discharge port 3 of the image forming apparatus A, and (1) accommodates the sheet in the discharge tray 21 without any post-processing (described later “ Printout mode "), or (2) the sheets from the main body discharge port 3 are aligned in a bundle and stapled, and then stored in the discharge tray 21 (" staple binding mode "described later). Or (3) The sheets from the main body discharge port 3 are arranged in a bundle and then folded into a booklet and stored in the second discharge tray 22 (“sheet bundle folding mode” described later). Yes.

  Therefore, the post-processing apparatus B is provided with the first paper discharge tray 21 and the second paper discharge tray 22 in the casing 20 as shown in FIG. Further, a sheet carry-in path P1 having a carry-in port 23 connected to the main body discharge port 3 is provided. The sheet carry-in path P <b> 1 is configured by a substantially horizontal straight path in the casing 20. A first switchback conveyance path SP1 and a second switchback conveyance path SP2 that branch from the sheet carry-in path P1 and transfer the sheet in the reverse direction are arranged. The first switchback transport path SP1 is branched from the sheet carry-in path P1 to the downstream side of the path, and the second switchback transport path SP2 is branched to the upstream side of the path, and the two transport paths are spaced apart from each other (see FIG. 2 in the left-right direction).

  A stacking tray 29 is disposed on the downstream side of the first switchback transport path SP1, and the first paper discharge tray 21 is connected to the downstream side thereof. A stacking guide 35 (sheet guide) is disposed on the downstream side of the second switchback transport path SP2, and the second discharge tray 22 is connected to the downstream side thereof.

  With such a path configuration, a carry-in roller 24 and a paper discharge roller 25 are disposed in the sheet carry-in path P1, and these rollers are connected to a drive motor M1 (not shown) that can rotate forward and backward. Further, a path switching piece 27 for guiding the sheet to the second switchback transport path SP2 is disposed in the sheet carry-in path P1, and is connected to an operating means such as a solenoid. Further, a buffer guide 26 for temporarily staying and holding the sheet reaching the second switchback conveyance path SP2 is provided on the sheet carry-in path P1. A post-processing unit 28 is provided between the carry-in port 23 and the carry-in roller 24 to perform post-processing such as stamping (stamping means) and punching (punching means) on the sheet from the image forming apparatus A.

[Configuration of the first switchback transport path SP1]
As described above, the first switchback conveying path SP1 disposed on the downstream side (rear end portion of the apparatus) of the sheet carry-in path P1 is configured as follows. The sheet carry-in path P1 is provided with a paper discharge roller 25 and a paper discharge port 25a at the exit end thereof, and a stacking tray 29 is provided on the downstream side with a step difference from the paper discharge port 25a. The stacking tray 29 is a tray that stacks and supports sheets from the sheet discharge outlet 25a. Above the stacking tray 29, a forward / reverse roller 30 is disposed so as to be movable up and down between a position in contact with the sheet on the tray and a separated standby position (a chain line position in FIG. 3). A forward / reverse motor M2 is connected to the forward / reverse roller 30 and rotates in the clockwise direction when the sheet enters the stacking tray 29, and rotates in the counterclockwise direction after the trailing edge of the sheet enters the tray. To be controlled. Thus, the first switchback transport path SP1 is formed above the stacking tray 29. 31 is a conveyance belt, and one end thereof is in pressure contact with the paper discharge roller 25. The conveyor belt 31 is pivotally supported so that the front pulley side hangs down on the stacking tray 29 around the pulley shaft 31a on the paper discharge roller 25 side. A driven roller 30 b shown in the figure is engaged with the forward / reverse roller 30 and is provided on the stacking tray 29.

  With the configuration of the first switchback conveyance path SP1 described above, the sheet from the sheet discharge outlet 25a enters the stacking tray 29 and is conveyed toward the first sheet discharge tray 21 by the forward / reverse rotation roller 30, and the rear end of the sheet is discharged. After entering the stacking tray 29 from the opening 25a, when the forward / reverse rotation roller 30 is rotated in the reverse direction (counterclockwise in the figure), the sheet on the tray is transferred in the direction opposite to the paper discharge direction. At this time, the caterpillar belt 31 conveys the rear end of the sheet along the stacking tray 29 toward the rear end regulating member 32 in cooperation with the forward / reverse roller 30.

  A rear end regulating member 32 that restricts the position of the rear end of the sheet and a stapling device 33 (hereinafter referred to as an “end face binding staple unit”) are disposed at the rear end of the stacking tray 29 in the paper discharge direction. The illustrated end face binding staple unit 33 staples one or a plurality of positions of the trailing edge of the sheet bundle stacked on the tray. The stacking tray 29 is provided with a carry-out mechanism for carrying out the bound sheet bundle to the first paper discharge tray 21. The illustrated carry-out mechanism includes a grip claw 32a that grips a sheet bundle, a drive arm 34a that reciprocates the grip claw left and right along the tray 29, and a paper discharge motor M3 that operates the drive arm 34a. .

  Further, the stacking tray 29 is provided with a side alignment plate 34b (not shown) for aligning the width direction of the sheets stacked on the tray. It is composed of a pair of alignment plates and is connected to an alignment motor M4 (not shown) so as to approach and separate from the center of the sheet.

  The first switchback transport path SP1 configured as described above aligns the sheets from the sheet discharge outlet 25a on the stacking tray 29 in the “staple binding mode”, and the sheet bundle is bound by the end face binding stapler 33. Staple binding is performed at one or a plurality of locations on the trailing edge. In the “print-out mode”, the sheet from the paper discharge outlet 25a is carried out along the stacking tray 29 toward the first paper discharge tray 21 without being switched back. As shown in the figure, the sheet to be stapled is bridge-supported by the stacking tray 29 and the first paper discharge tray 21 disposed on the downstream side thereof. As a result, the apparatus can be made compact.

[Configuration of second switchback transport path]
The configuration of the second switchback conveyance path SP2 branched from the sheet carry-in path P1 will be described. As shown in FIG. 3, the second switchback transport path (sheet guide; hereinafter the same) SP2 is configured to transfer the sheet to the apparatus casing 20 in a substantially vertical direction, and the sheet discharge port 36a discharges the sheet. Rollers 36b and 36c are arranged. Reference numeral 36r in the drawing denotes a conveyance roller for conveying the sheet. Accordingly, the sheet carried in from the above-mentioned sheet carry-in path P1 is configured to carry out the switchback conveyance of the sheet in the vertical direction from the second switchback conveyance path SP2 via the path switching piece 27. A sheet carry-in guide 37 described later is disposed in the second switchback conveyance path P.

[Configuration of Accumulation Guide Means (Sheet Guide)]
A stacking guide 35 is arranged at the downstream side of the discharge port 36a of the second switchback transport path SP2 (sheet carry-in path). As shown in FIG. 2, the illustrated accumulation guide 35 includes a curved or bent guide member 35 a that accumulates sheets in a standing posture in a substantially vertical direction. The guide member 35a is composed of a bent or curved guide plate as shown in the figure, and the sheet is bent so that the folded portion (Y in FIG. 2) of the sheet supported by the guide member 35a protrudes toward the folding roll described later. Supported by deposition.

  The accumulation guide 35 is provided with sheet end regulating means 38 for supporting the sheet leading end (lower end side in FIG. 2). As shown in FIG. 5, the sheet end regulating means 38 includes a locking member 38a that holds the leading edge of the sheet carried along the guide member 35a and locks it, and a sheet bundle that is stacked and supported by the locking member 38a. It is comprised by the grip member 38b which hold | grips. The grip member 38b is axially supported by the locking member 38a, and is configured to grip and hold the leading end of the sheet whose tip is regulated by the locking member. An operating solenoid 38L and an urging spring 38S are connected to the grip member 38b, and the urging spring 38S always acts in the grip releasing direction of the seat, and grips and holds the sheet when the operation solenoid 38L is energized. It is like that.

  The sheet end regulating means 38 configured as described above is attached to the apparatus frame so as to be movable along the guide member 35a. Reference numeral 38g denotes a guide rail, and a front end regulating unit composed of the locking member 38a, the grip member 38b, and the operating solenoid 38L is supported by the guide rail 38g, and is supported so as to be movable along the integrated guide 35. . The tip regulating unit is connected to the shift motor 38M by a rack 38r and a pinion 38p. Therefore, the shift motor 38M constitutes a shift means MS that moves the grip member 38b (grip means) and the locking member 38a along the integrated guide 35.

  When the sheet is loaded into the stacking guide 35, the shift means MS moves the locking member 38a that abuts and regulates the leading end of the sheet along the stacking guide 35 according to the sheet size, and the sheet trailing edge is ejected. It is located at a predetermined position Z (see FIG. 2) below the mouth 36a. That is, the shift means MS moves the position of the sheet end regulating means 38 in accordance with the sheet size signal so that the rear end of the sheet is aligned with the predetermined position Z below the sheet discharge port 36a. Further, after the sheets are stacked on the stacking guide 35, the shift unit MS moves the sheet bundle to the binding position X and then to the folding position Y. At this time, the grip means 38b moves while gripping the sheet bundle, and the operation will be described later.

[Composition of sheet carry-in guide]
As described above, in order to stack the sheets carried out from the paper discharge port 36a of the second switchback conveyance path P2 above the sheets supported by the stacking guide 35, a sheet carry-in guide 37 is provided at the paper discharge port 36a. Is provided. The carry-in guide 37 guides the leading edge of the sheet from the sheet discharge outlet 36a onto the sheet accumulated in the guide. The carry-in guide 37 guides the leading end of the sheet onto the stacking guide 35 and then moves onto the carry-in sheet after loading the sheet so as to swivel above the stacking guide 35 in order to prepare for loading of the subsequent sheet. Configured. An embodiment of the carry-in guide 37 that guides the front end of the sheet from the paper discharge port 36a above the stacking guide 35 and returns to the carry-in sheet after carrying in the sheet will be described.

[Embodiment of carry-in guide]
A sheet carry-in guide 37B shown in FIGS. 6A and 6B includes a rotation guide member 37x and a tip guide member 37y pivotally attached thereto. The rotation guide member 37x is pivotally supported on the rotation shaft 37z at the rear end portion of the accumulation guide 35 so as to be pivotable. The rotation guide member 37x is swung past the opening 35c formed in the accumulation guide 35. It has become. A tip guide member 37y is pivotally supported by a tip pin 37p at the tip of the rotation guide member 37x. A control motor Mp1 is coupled to the rotation shaft 37z of the carry-in guide 37B configured as described above, and the rotation guide member 37x rotates above the integrated guide 35 by the rotation of the control motor Mp1. The leading end guide member 37y is disposed so as to engage with the rear end of the sheet on the stacking guide 35, and the leading end guide member 37y is arrowed around the shaft pin 37p as the rotation guide member 37x at the base end rotates. It is configured to swing in the viewing direction.

Accordingly, when the rotation guide member 37x is positioned in the state shown in FIG. 6A, the sheet from the sheet discharge outlet 36a is the uppermost sheet of the stacking guide 35 along the upper surface of the rotation guide member 37x and then the upper surface of the leading end guide member 37y. Guided on the top. When the control motor Mp1 is rotated after the sheet is carried onto the accumulation guide 35, the rotation guide member 37x rotates counterclockwise as shown in the figure, and returns to the state shown in FIGS. At this time, the front end guide member 37y swings so as to be bent around the shaft pin 37p by being blocked by the accumulation guide 35 and the sheet on the accumulation guide, and returns to the state of FIG.

[Configuration of pressurizing means]
Above the stacking guide 35, a pressurizing unit 48 is provided for pressing the trailing end of the sheets stacked together with the carry-in guide unit 37. This pressurizing means 48 is for pressing the rear end of the sheet when the sheets are bound at a binding position X described later and / or when the sheet is folded at a folding position Y described later. This pressurizing means is configured as follows .

[Embodiment of pressurizing means]
Different embodiments of the above pressurizing means will be described.
In FIG. 6 (a) (b) shows the configuration of the pressing means 48B for pressing the sheet bundle on collecting guide 35 in conjunction with the loading guide 37B mentioned above. Above the stacking guide 35, a paper pressure piece 48x that presses the trailing end of the sheet is swingably arranged around a shaft 48y. By swinging around the shaft 48y, the paper pressure piece 48x is placed in the stacking guide. 35 is configured to move up and down between a position where the uppermost sheet on 35 is pressed and a retracted position spaced apart from the uppermost sheet. The paper pressure piece 48x is provided with a biasing spring 48z in a direction that always presses the uppermost sheet. The shaft 48y is provided with a cam member (not shown) for shifting the paper pressure piece to the retracted position spaced from the uppermost sheet against the biasing spring 48z. Therefore, when the carry-in guide 37B is positioned on the uppermost sheet of the stacking guide 35 by rotating the control motor Mp2 connected to the shaft 48y, the pressurizing means 48B is synchronized with this in the standby position (separated from the uppermost sheet). When the carry-in guide 37B is located at a position away from the stacking guide 35, the pressurizing means 48B is located at a position where the uppermost sheet is pressed. In this case, the spring pressure of the biasing spring 48z is set so that the pressure p1 exerted on the rear end of the paper pressure piece 48x is balanced with the pressure p2 of the grip member 38b that holds the front end of the sheet.

[Configuration of staple binding apparatus]
The stacking guide 35 is provided with saddle stitching stapling means 40 for stapling a bundle of sheets aligned on the stacking section. In the illustrated accumulation guide 35, a binding position X is set on the upstream side, and a folding position Y is set on the downstream side. The saddle stitching stapling means 40 includes a driver unit 40A and a clinch unit 40B, and each unit is configured to be separated at opposing positions with the accumulation guide 35 interposed therebetween.

  A needle cartridge is mounted on the driver unit 40A, and a needle connected in a belt shape is built in the cartridge. The needle member at the tip is bent into a U shape by the former member by a driver member that moves up and down between the upper dead center and the lower bottom dead center, and then this needle is inserted into the sheet bundle. Has been. Accordingly, the driver unit 40A includes a drive motor M, a drive arm that moves the driver member up and down, a drive cam that drives the arm, and the like.

  The clinch unit 40B is provided with a bent groove or a bent wing for bending the tip of the staple needle inserted into the sheet bundle. The saddle stitching stapling apparatus 40 configured in this way is configured such that the driver unit 40A and the clinch unit 40B are separated and face each other, and a sheet bundle can pass between the two along the stacking guide. . Accordingly, it is possible to staple the central portion of the sheet bundle and other arbitrary positions.

[Configuration of folding roll means]
A folding roll means 45 for folding the sheet bundle at the folding position Y arranged on the downstream side of the saddle stitching stapling apparatus 40, and a folding blade (folding blade means) for inserting the sheet bundle at the nip position of the folding roll means 45. ) 46 is provided. The folding roll means 45 is composed of folding rolls 45a and 45b that are in pressure contact with each other, and each roll is formed to have a substantially maximum sheet width. The pair of folding rolls 45a and 45b are fitted with the long shafts of the apparatus frame so that the rotary shafts 45ax and 45bx are in pressure contact with each other, and are urged in the pressure contact direction by a compression spring. The folding rolls 45a and 45b may be structured such that at least one of them is axially supported so as to be movable in the press-contact direction, and a biasing spring is stretched over one of the folding rolls 45a and 45b.

  Each of the folding rolls 45a and 45b is connected to roll driving means. As shown in FIGS. 5A and 5C, the illustrated roll driving means RM includes a roll driving motor M6 and a transmission mechanism (transmission means) 47V. The illustrated transmission means 47V is composed of a transmission belt that decelerates the rotation of the roll drive motor M6 and transmits it to the transmission shaft 47X. Clutch means 45c is disposed between the transmission shaft 47X and the rotation shaft 45ax of the first folding roll 45a. Similarly, a clutch means 45c is also arranged between the second folding roll 45b and the rotation shaft 45bx. This clutch means 45c is an electromagnetic clutch, a one-way clutch (one-way clutch), a sliding friction clutch (spring clutch), etc., and the drive rotation of the roll drive motor M6 is turned on and off to the first folding roll 45a and the second folding roll 45b. Configure as you can.

  The illustrated clutch means 45c is constituted by a one-way clutch, and is configured to transmit the rotation of the transmission shaft 47X to the transmission collar 47Z only in one direction between the transmission shaft 47X and the transmission collar 47Z. The first folding roll 45a is gear-connected to the transmission collar 47Z, and the second folding roll 45b is belt-connected. Thus, only one direction of rotation of the motor is transmitted to the first and second folding rolls 45a and 45b connected to the roll drive motor M6 via the clutch means 45c, and the folding rolls 45a and 45b are simultaneously fed out of the sheet. It is configured to be freely rotatable in the direction.

The pair of folding rolls 45a and 45b are positioned on the curved or bent protruding side of the stacking guide 35, and the distance h shown in FIG. 9A with respect to the sheet bundle supported by the stacking guide 35 of the stacking guide 35 . Are offset at positions separated from each other. That is, the sheet (bundle) supported by the accumulation guide 35 is disposed at a position where the roll surface does not contact with the offset distance h. An exit guide portion 35 d is disposed between the folding roll means 45 and the accumulation guide 35 that are arranged offset.

[Configuration of folding blade means]
A folding blade (folding plate) 46 having a knife edge is provided at a position facing the folding roll means 45 across the sheet bundle. The folding blade 46 is supported by reciprocably apparatus frame between the standby position and the nip position of FIG. (D) (or the vicinity thereof) of FIG. 9 (a). Blade driving means BM is connected to the folding blade 46. The folding blade 46 is configured to reciprocate by a blade drive motor M7 between a standby position retracted from the sheet bundle supported by the stacking guide 35 and a nip position between the pressure contacts of the folding roll means 45. The folding blade 46 is formed in a plate shape with a material having a relatively small friction coefficient such as metal, and the tip thereof is formed in an uneven surface as shown in FIG. 9B. As described above, the blade tip is formed into a shape that enters the gap between the first and second folding rolls 45a and 45b.

Therefore, in the illustrated example, the relationship between the friction coefficient ν1 between the first and second folding rolls 45a and 45b and the sheet, the friction coefficient ν2 between the sheets, and the friction coefficient ν3 between the sheet and the folding blade 46 is as follows. The relation of “ν1>ν2> ν3” is set. Therefore, in the state where the sheet bundle shown in FIG. 9D is inserted between the first folding roll 45a and the second folding roll 45b by the folding blade 46, the pressure contact force acting on both folding rolls 45a, 45b is It reaches each as a force equal to the sheet bundle and blade. At this time, since the friction coefficient is set to the above relationship, the sheet bundle is smoothly fed in the feeding direction (left side in the figure).

Next, the configuration of the blade driving means BM of the folding blade 46 will be described . As shown in FIG. 8B, the folding blade 46 is supported on the apparatus frame by a guide rail 46g so as to be movable in the sheet folding direction. The folding blade 46 is supported so as to be able to reciprocate between a standby position retracted from the sheet supported by the accumulation guide 35 and a nip position between the first and second folding rolls 45a and 45b. The blade drive means BM for reciprocating the folding blade 46 is constituted by a blade drive motor M7 and a transmission means 46V for transmitting the rotation thereof, and the illustrated one is transmitted to the transmission rotation shaft 46X by a transmission belt. The transmission rotation shaft 46X is provided with a transmission pinion 46P and meshed with a rack gear 46L attached integrally to the folding blade 46.

  Therefore, when the blade drive motor M7 rotates forward and backward, the folding blade 46 reciprocates between the standby position and the nip position along the guide rail 46g. The folding blade 46 is composed of a plate-like member having a knife edge in the sheet width direction, and its tip is formed in an uneven shape as shown in the figure.

[Description of sheet post-processing operation]
Next, the sheet stacking (part alignment) operation and the post-processing operation in the post-processing apparatus configured as described above will be described.
[Refer to Initial State Diagram 10 (a)]
FIG. 10A shows an initial state immediately before the sheet is carried out from the image forming apparatus A to the post-processing apparatus B. FIG. At this time, the carry-in guide 37A (same for 37B; the same applies hereinafter) is located at a home position (shown position) different from the guide posture on the stacking guide. The pressurizing means 48A (same for 48B; the same applies hereinafter) is located at a pressing position (home position; illustrated position) on the accumulation guide 35. The grip means 38b is located at a grip position (home position; illustrated position).

[Refer to Fig. 10 (b) of the sheet loading state]
Therefore, a control unit including, for example, a control CPU (not shown) provided in the post-processing apparatus B receives a discharge instruction signal and sheet size information from the image forming apparatus A. The control means based on the sheet size information to move to a position corresponding to the sheet length of the sheet end regulating means 38 from the home position (Sh1 in Fig. 10 (b), Sh2, Sh3 ). This position Sh is set in advance so that the trailing edge of the sheet fed from the image forming apparatus A is aligned with the predetermined position Z of the stacking guide 35.

  Next, the control unit receives the sheet sent from the image forming apparatus A into the sheet carry-in path P <b> 1, and sends the sheet to the downstream discharge roller 25 by the transport roller 24. Then, the control means detects the trailing edge of the sheet by the sheet sensor S1 in the sheet conveyance path P1, and then operates the path switching piece 27 after an estimated time that the sheet trailing edge has passed the path switching piece 27. At this time, the control means moves the path switching piece 27 so that the sheet is guided to the second switchback conveyance path SP2. Thereafter, the control means reversely rotates the paper discharge roller 25 to carry the rear end of the sheet into the second switchback conveyance path SP2.

The carry-guide 37A as described above behavior and behind the other control means shown in FIG. 10 (b) in the sheet guide position, the pressurizing means 48A to the retracted position, to move each gripping member 38b to the retracted position. The carry-in guide 37A rotates the drive motor 37M from the home position sensor 37hs by a predetermined angle to move the elastic guide piece 37A to the guide position, and guides the sheet onto the stacking guide 35 from the paper discharge port 36a. The pressure unit 48A supplies power to the electromagnetic solenoid 48b, and the paper pressure piece 48a moves to a retracted position away from the uppermost sheet of the stacking guide 35. The grip member 38b is moved to a non-actuated position (release position) in which the actuation solenoid 38L is turned on to retract the grip member 38b from the seat. In this state, the control unit operates the paper discharge rollers 36b and 36c to send out the sheet (carrying sheet) guided to the second switchback conveyance path SP2 onto the accumulation guide 35.

[Loading guide retracting and returning operation; see FIG. 11 (c)]
Next, the control means rotates the drive motor 37M of the carry-in guide 37A after the estimated time that the carry-in sheet is carried onto the stacking guide 35 based on the sheet trailing edge detection signal from the sheet sensor S2 disposed at the paper discharge port 36a. To drive. Then, the elastic guide piece 37A pivots above the accumulation guide 35 around the base end portion 37a. At this time, the front end portion 37B engaged with the sheet on the accumulation guide 35 is elastically deformed and swivels along the accumulation guide. When the elastic guide piece 37 </ b> A rotates 360 degrees, the tip portion returns to the carry-in sheet. In this state, when the next sheet is carried in from the paper discharge port 36a, the carry-in sheet is guided onto the uppermost sheet on the stacking guide 35 in the same manner as before. By repeating such an operation, the sheets sent to the paper discharge outlet 36a are sequentially stacked on the stacking guide 35.

[Movement of sheet bundle binding position; see FIG. 11 (d)]
When a series of sheets are stacked on the stacking guide 35, the control unit executes post-processing on the sheet bundle on the stacking tray 29 in response to a “job end signal” from the image forming apparatus A. The illustrated apparatus is configured to perform a binding process and then a folding process on the sheet bundle stacked on the stacking guide 35. Therefore, when the control means receives the job end signal, the control solenoid 38L of the grip means 38b is turned "ON" to grip the leading edge of the sheet bundle. At this time, the carry-in guide 37A is moved to the retracted position (home position; illustrated position) retracted from the accumulation guide 35, and the pressurizing means 48A is held at the position moved to the standby position (the electromagnetic solenoid 48b is in the ON state). Yes.

  Therefore, the control means moves the position of the front end regulating unit (the front end locking member 38a and the grip member 38b) by the shift means MS. In this position movement, a predetermined position (for example, the center of the sheet) of the sheet bundle positioned by the leading end locking member 38a and held by the grip member 38b is moved to the binding position X.

[Sheet binding operation; see FIG. 12 (e)]
Next, the control unit moves the sheet bundle on the stacking guide 35 to the binding position X, and then moves the pressing unit 48A to the pressing position. In this operation, the electromagnetic solenoid 48b is moved from the standby position (ON state) to the pressing position (OFF state), and the paper pressure piece 48a is shifted from the retracted position to the pressing position. Then, the front end of the sheet bundle positioned at the binding position X is gripped by the grip member 38b, and the rear end is pressed and held by the paper pressure piece 48a of the pressurizing unit 48A. In this state, the control unit operates the stapling device 40 to execute a binding operation on the sheet bundle. The binding operation of the stapling apparatus 40 is as described above.

[Sheet folding position movement; see FIG. 12 (f)]
After the binding operation is completed, the control means moves the bound sheet bundle to the downstream folding position Y. When the sheet bundle is moved to the folding position Y on the downstream side, the paper pressure piece 48a of the pressure unit 48A is held at a position to press the rear end portion of the sheet bundle, and the leading end portion of the sheet bundle is gripped by the grip member 38b. Is done. Thereafter, the control means moves the leading edge restricting unit with the shift means MS and moves the sheet bundle to the folding position Y while holding both ends of the sheet bundle with the pressurizing means 48A and the grip member 38b. At this time, by gripping both ends of the sheet bundle, tension is given to the sheet bundle, and the folding accuracy is further improved.

[Sheet folding operation; see FIGS. 13 (g) and 13 (h)]
After the sheet bundle is moved to the predetermined folding position, the control means shifts the paper pressure piece 48a of the pressure means 48A to the pressing position. In this shift, the electromagnetic solenoid 48b is turned OFF, and the paper pressure piece 48a is pressed and biased toward the stacking guide 35 by the biasing spring 48c. Then, as shown in FIG. 13G, the sheet bundle on the stacking guide 35 is held at the front end by the grip member 38b, and the rear end is pressed and held by the paper pressure piece 48a. In this state, the control unit folds the sheet bundle according to the procedure described below. Then, as shown in FIG. 11H, the sheet bundle whose front end is pressed by the grip member 38b and whose rear end is pressed by the paper pressure piece 48a is bent at the center by the folding blade 46 and folded by the folding roll. FIG. 4G shows the state at the start of bending, and FIG. 3H shows the state where the grip member and the paper pressure piece are detached.

[Sheet Folding Procedure; FIG. 9 (a) to (e)]
The sheet bundle supported by the stacking guide 35 in the state of FIG. 9A is locked by the sheet end regulating means 38, and the fold position is positioned at the folding position Y in the stapled state. At this time, the sheet bundle is supported in a curved state so as to protrude toward the folding roll, the sheet front end is held by the grip member 38b, and the rear end is held by the pressurizing means 48A.

  Therefore, the control means obtains the sheet bundle setting end signal and turns off the clutch means 45c. In the above-described one-way clutch configuration, the roll drive motor M6 is stopped or the roll drive motor M6 is rotated at a lower speed than the moving speed of the folding blade 46. This is to create a condition for the first and second folding rolls 45a and 45b to be driven and rotated by the sheet bundle inserted at the nip position by the folding blade 46, as will be described later.

Therefore, the drive control means 64d moves the folding blade 46 from the standby position toward the nip position at a predetermined speed. The rotational speed VR of the folding rolls 45a and 45b is set to zero or VB> VR with respect to the moving speed VB. Therefore the state in the sheet bundle of FIG. 9 (b) is bent to folding position by the folding blade 46 is inserted between the rolls. Then, the sheet bundle is pushed out toward the folding roll while being gradually bent along the outlet guide portion 35d at the fold position.

  At this time, the sheet on the stacking guide 35 is supported on the stacking guide in a curved posture while projecting to the folding roll side. At the same time, the leading end of the sheet is pressed by the grip member 38b (pressing pressure p2), and the trailing end is pressed by the paper pressure piece 48a (pressing pressure p1) of the pressurizing means 48A. The spring pressure is adjusted so that the pressures p1 and p2 at the front and rear ends of the sheet are balanced. The sheet bundle supported on the stacking guide 35 in such a state is sent out at the folding position Y to the folding roll side by the folding blade 46 as follows. (1) Since the sheet bundle is supported in a curved state so as to be bent back to the folding roll side, when a plurality of sheets are sent from the image forming apparatus A, sheets having curl directions upward and downward are mixed. When the sheets are stacked on the stacking guide 35, these sheets are curved and supported in the same posture in one direction. For this reason, the sheet curled in the upward attitude and the sheet curled in the downward attitude are corrected in accordance with the accumulation guide and are aligned in the same attitude. (2) Since this sheet bundle is supported in a curved manner so as to protrude toward the folding roll, the sheet does not wrinkle when the folding position is projected by the folding blade, and the folding position does not shift. At the same time, (3) when the sheet bundle is gradually pushed out to the folding roll by the folding blade, the leading edge of the sheet is restrained by the grip member 38b and the trailing edge of the sheet is restrained by the pressurizing means 48A. Will not occur. Further, (4) since the spring pressure is adjusted so that the applied pressure acting on the sheet is balanced between the leading edge and the trailing edge of the sheet, the folding position does not shift when the sheet bundle is fed out by the folding blade.

Next, when the sheet bundle is inserted into the roll nip position in the state shown in FIG. 5C, the first folding roll 45a and the second folding roll 45b are driven and rotated by the folding blade 46 in conjunction with the moving sheet. The drive control means 64d stops the blade drive motor M7 after the expected time for the sheet bundle to reach the predetermined nip position, and stops the folding blade 46 at the position shown in FIG.

  Next, the control means 64d switches the clutch means 45c to the ON state to drive and rotate the folding rolls 45a and 45b. Then, the sheet bundle is sent out in the feeding direction (left side in the figure). Thereafter, the drive control means 64d moves and returns the folding blade 46 located at the roll nip position to the standby position in parallel with the feeding of the sheet bundle by the folding rolls 45a and 45b in the state shown in FIG.

  When the sheet bundle folded in this way is first bent and pushed out from the exit guide portion 35d from the state supported by the accumulation guide 35, the sheet bundle is warped toward the folding roll means 45 along the accumulation guide 35. It is collected in. For this reason, since the bending direction of the sheet itself does not change (change from concave to convex), no folding occurs. At the same time, the center position curved in a concave shape is pushed out by the folding blade 46, so that the crease position of the sheet does not become slell. Next, when this sheet bundle is engulfed between the pair of folding rolls 45a and 45b, the folding rolls 45a and 45b are driven to rotate, so that the sheet in contact with the roll surface is drawn between the rolls by the rotating roll. It will not be. That is, since the folding rolls 45a and 45b follow (follow) the inserted sheet (rotate) and rotate, only the sheet in contact with the roll is not first wound. Further, since the folding rolls 45a and 45b follow and rotate following the inserted sheet, the roll surface and the sheet in contact therewith are not rubbed, and image rubbing is not caused.

[Description of control configuration]
The control configuration of the above-described image forming system will be described in accordance with the block diagram of FIG. 14. The image forming system shown in FIG. 1 includes a control unit (hereinafter referred to as “main body control unit”) 50 of the image forming apparatus A and a control unit (hereinafter referred to as “post-processing control unit”) 60 of the post-processing apparatus B. The main body control unit 50 includes an image formation control unit 51, a paper feed control unit 52, and an input unit 53. Then, the “image forming mode” and “post-processing mode” are set from the control panel 18 provided in the input unit 53. As described above, the image forming mode sets the number of printouts, sheet size, color / monochrome printing, enlargement / reduction printing, duplex / single-sided printing, and other image formation conditions. The main body control unit 50 controls the image forming control unit 51 and the paper feed control unit 52 according to the set image forming conditions, and after the image is formed on a predetermined sheet, the sheets are sequentially carried out from the main body discharge port 3. .

  At the same time, the post-processing mode is set by input from the control panel 18. The post-processing mode is set to, for example, “print-out mode”, “staple binding finishing mode”, “sheet bundle folding finishing mode”, or the like. Therefore, the main body control unit 50 transfers the finishing mode of the post-processing, the number of sheets, the number of copies information, and the binding mode (one-position binding or two or more bindings) information to the post-processing control unit 60. At the same time, the main body control unit 50 transfers a job end signal to the post-processing control unit 60 every time image formation is completed.

  The post-processing control unit 60 includes a control CPU 61 that operates the post-processing apparatus B in accordance with a designated finishing mode, a ROM 62 that stores an operation program, and a RAM 63 that stores control data. In the RAM 63, the position data of the sheet locking positions Sh1, Sh2, Sh3 of the sheet end regulating means 38 according to the size (length in the conveying direction) of the sheet transferred to the second switchback conveying path SP2 is, for example, a data table. Have been prepared in. The control CPU 61 includes a sheet conveyance control unit 64 a that performs conveyance of the sheet sent to the carry-in entrance 23, a sheet accumulation operation control unit 64 b that performs sheet accumulation operation, and a sheet binding process that performs sheet binding processing. An operation control unit 64c and a sheet folding operation control unit 64d for performing a sheet folding operation are provided.

  The sheet conveyance control unit 64a is connected to the control circuit of the driving motor M1 of the conveyance roller 24 and the discharge roller 25 of the sheet carry-in path P1 and receives a detection signal from the sheet sensor S1 arranged in this path. It is configured as follows. Further, the sheet stacking operation control unit 64b drives the forward / reverse rotation motor M2 of the forward / reverse rotation roller 30 and the discharge motor M3 of the trailing end regulating member 32 in order to stack sheets on the first stacking unit (stacking tray) 29. Connected to the circuit. Further, the sheet binding processing operation control unit 64c is connected to a drive circuit of a drive motor M incorporated in the saddle stitching stapling device 40 of the end surface binding stapling device 33 and the second stacking unit (stacking guide) 35 of the stacking tray 29. Yes.

The sheet folding operation control unit 64d is connected to a drive circuit of a roll drive motor M6 that drives and rotates the folding rolls 45a and 45b and a control circuit of the clutch means 45c. The sheet folding operation control unit 64d is connected to the control circuit of the shift means MS that controls the movement of the conveying rollers 36 and 37 and the sheet end regulating means 38 of the stacking guide 35 to a predetermined position, and positions arranged in these paths. Wired to receive a detection signal from the sensor.

The control unit configured as described above causes the post-processing apparatus B to execute the next processing operation.
"Printout mode"
In this mode, the image forming apparatus A forms an image of a series of documents, for example, from the first page, and sequentially carries out face-down from the main body discharge port 3. Therefore, the post-processing apparatus B retracts the buffer guide 26 of the sheet carry-in path P1 upward in FIG. 3, and moves the path switching piece 27 to the state of the solid line in FIG. Thus, the sheet sent to the sheet carry-in path P1 is guided to the paper discharge roller 25. Therefore, after the expected time that the leading edge of the sheet reaches the forward / reverse roller 30 of the stacking tray 29 based on the signal detected by the sheet discharge port 25a, the sheet conveyance control unit 64a moves the forward / reverse roller 30 from the upper standby position onto the tray. Then, the forward and reverse rollers are rotated clockwise in FIG. Then, the sheet that has entered the stacking tray 29 is carried out toward the first paper discharge tray 21 by the forward / reverse rotation roller 30 and stored on the tray. The successive sheets are sequentially carried out to the first paper discharge tray 21 and accumulated and stored on the tray.

  Accordingly, in this printout mode, the sheets on which the image is formed by the image forming apparatus A are accommodated in the first paper discharge tray 21 via the sheet carry-in path P1 of the post-processing apparatus B. The pages are stacked and stored in the order of the pages. In this mode, no sheet is guided to the first switchback conveyance path SP1 and the second switchback conveyance path (sheet carry-in path) SP2.

"Staple binding finish mode"
In this mode, the image forming apparatus A forms an image of a series of documents in the order from the first page to the nth page as in the above-described printout mode, and carries out from the main body discharge port 3 in a face-down state. Accordingly, the post-processing apparatus B retracts the buffer guide 26 of the sheet carry-in path P1 upward in FIG. 3 as in the previous mode, and moves the path switching piece 27 to the state of the solid line in FIG. Thus, the sheet sent to the sheet carry-in path P1 is guided to the paper discharge roller 25. Therefore, after the expected time that the leading edge of the sheet reaches the forward / reverse roller 30 of the stacking tray 29 based on the signal detected by the sheet discharge port 25a, the sheet conveyance control unit 64a moves the forward / reverse roller 30 from the upper standby position onto the tray. Then, the forward and reverse rollers are rotated clockwise in FIG. Next, the sheet conveyance control unit 64a drives the forward / reverse rotation roller 30 to rotate counterclockwise in FIG. 3 after the estimated time when the trailing edge of the sheet is carried onto the stacking tray 29. Then, the sheet that has entered from the paper discharge outlet 25a is switched back and conveyed onto the stacking tray 29 along the first switchback conveyance path SP1. By repeating this sheet conveyance, a series of sheets are stacked on the stacking tray 29 in a face-down state.

  Each time the sheets are stacked on the stacking tray 29, the control CPU 61 operates the side aligning plate 34b to align the width direction position of the sheets to be stacked. Next, the control CPU 61 operates the end-face stitching and stapling device 33 in response to the job end signal from the image forming apparatus A to bind the trailing edge of the sheet bundle stacked on the stacking tray 29. After this stapling operation, the control CPU 61 moves the rear end regulating member 32 that also serves as a bundle carrying-out means from the solid line position in FIG. 3 to the chain line position. Then, the staple-bound sheet bundle is carried out and stored on the first paper discharge tray 21. As a result, a series of sheets formed by the image forming apparatus A are stapled and stored in the first paper discharge tray 21.

"Sheet fold finish mode"
In this mode, the image forming apparatus A forms an image on a sheet in the order described with reference to FIG. Therefore, the post-processing apparatus B retracts the buffer guide 26 of the sheet carry-in path P1 upward in FIG. 3, and moves the path switching piece 27 to the state of the solid line in FIG. Thus, the sheet sent to the sheet carry-in path P1 is guided to the paper discharge roller 25. Therefore, the control CPU 61 stops the paper discharge roller 25 at the timing when the trailing edge of the sheet passes the path switching piece 27 with reference to the signal detected by the sheet sensor S1, and at the same time, sets the path switching piece 27 to the position of the broken line in FIG. Moving. Then, the paper discharge roller 25 is reversely rotated (counterclockwise in FIG. 3). Then, the sheet that has entered the sheet carry-in path P1 is reversed in the conveyance direction, and is guided from the path switching piece 27 to the second switchback conveyance path SP2. Then, as described above, the sheets are aligned and stacked on the stacking guide 35 and subjected to “binding processing” and “folding processing”.

1 is an explanatory diagram of an overall configuration of an image forming system according to the present invention. FIG. 2 is an overall explanatory diagram of a post-processing device in the system of FIG. 1. Detailed explanatory drawing which shows the switchback conveyance path of the post-processing apparatus of FIG. FIG. 2 is an explanatory diagram showing an image forming order in the apparatus of FIG. 1. FIG. 3 is an explanatory diagram showing a configuration of sheet end regulating means in the apparatus of FIG. 2. It is explanatory drawing which shows the structure of a sheet | seat carrying-in guide and a pressurization means. FIG. 7 is a perspective explanatory view of a sheet carry-in guide and a pressure unit in FIG. 6. FIG. 3 is an explanatory view of a driving mechanism in the apparatus of FIG. 2, (a) is a driving mechanism of a folding roll means, (b) is a driving mechanism of a folding blade, and (c) is a description of a cross section of FIG. Figure. FIGS. 3A and 3B are explanatory diagrams of a sheet bundle folding operation in the apparatus of FIG. 2, where FIG. 3A is a state diagram in which the sheet bundle is positioned at a folding position, FIG. 2B is an initial state diagram of the sheet bundle folding operation; ) Is a state diagram in which the sheet bundle is inserted into the nip position of the folding roll means, (d) is a state in which the sheet bundle is folded by the folding roll means, and (e) is a state diagram in which the folding operation is completed and the folding blade is retracted. . FIGS. 3A and 3B are explanatory diagrams of a sheet post-processing operation in the apparatus of FIG. 2, in which FIG. 3A is an initial state, and FIG. FIGS. 3A and 3B are explanatory diagrams of a sheet post-processing operation in the apparatus of FIG. 2, in which FIG. 3C is a state diagram in which sheets are stacked on a stacking guide, and FIG. . FIGS. 3A and 3B are explanatory diagrams of a sheet post-processing operation in the apparatus of FIG. 2, in which FIG. 3E is a state diagram of a binding operation for binding the sheet bundle, and FIG. State diagram. FIGS. 3A and 3B are explanatory diagrams of a sheet post-processing operation in the apparatus of FIG. 2, in which FIG. 3G illustrates an initial state of folding processing, and FIG. Explanatory drawing of the control structure in the system of FIG.

Explanation of symbols

A Image forming apparatus B Post-processing apparatus P1 Sheet carry-in path SP1 First switchback conveyance path SP2 Second switchback conveyance path (sheet carry-in path)
MS shift means 21 1st discharge tray 22 2nd discharge tray 23 carry-in port 24 carry-in roller 25 discharge roller 29 stacking tray 33 end face binding stapling device 35 stacking guide (sheet guide)
35a guide member 35d outlet guide portion 36b paper discharge roller 36c paper discharge roller 36r transport roller 37 carry-in guide 37A elastic guide piece (first embodiment)
37B Carry-in guide (second embodiment)
37x Rotating guide member 37y Tip guide member 37z Rotating shaft 37M Drive motor 38 Sheet end regulating means 38a Locking member 38b Grip member 38M Stepping motor 40 Saddle stapling device 45 Folding roll means 46 Folding blade (folding blade means)
48 Pressurizing means 48A Pressurizing means (first embodiment)
48a Paper pressure piece 48b Electromagnetic solenoid 48c Biasing spring 48B Pressurizing means (second embodiment)
48x paper pressure piece 48y shaft 48x biasing spring Mp1, Mp2 control motor

Claims (6)

A sheet carry-in path for feeding a sheet from the carry-in port to a downstream post-processing position from the paper discharge port;
A stacking guide means arranged to form a step on the downstream side of the discharge port, and stacking and stacking sheets in a bundle;
Post-processing means for performing a binding process and / or a folding process on the sheet bundle accumulated in the accumulation guide means;
Sheet leading edge regulating means for positioning regulation of the leading edge position of the sheets accumulated in the collecting guide means;
With
The sheet leading edge restricting means is configured to be movable according to the sheet size so that the rear end of the sheet supported by the stacking guide means is located at a predetermined position below the sheet discharge port,
A guide member for guiding the carry-in sheet onto the uppermost sheet supported by the stacking guide means is provided at the sheet discharge path of the sheet carry-in path,
The guide member is
A rotation guide member having a base end rotatably supported above the accumulation guide means, and a rotation guide member;
A front guide member which is axially connected pivotably to the tip portion of the rotation guide member,
Consists of
The rotation guide member is connected to a driving means for rotating around the base end ,
In the turning operation of the turning guide member by this driving means,
The sheet post-processing apparatus according to claim 1, wherein the leading edge guide member swings so as to be bent while being blocked by a paper surface of the uppermost sheet from an operating position for guiding the incoming sheet onto the uppermost sheet .
The post-processing means includes folding roll means disposed at a sheet folding position of the stacking guide means,
The accumulation guide means is composed of a curved or bent sheet placement guide,
The sheet post-processing apparatus according to claim 1, wherein the sheet placement guide supports the sheet folding position so that the sheet folding position protrudes toward the folding roll unit. The post-processing means includes a stapling means for binding the sheet bundle accumulated in the accumulation guide means and a folding roll means for folding the sheet bundle,
In the stacking guide means, the staple means is arranged at the upstream sheet binding position, and the folding roll means are sequentially arranged at the downstream sheet folding position in this order,
The accumulation guide means is composed of a curved or bent sheet placement guide,
3. The sheet post-processing apparatus according to claim 1, wherein the sheet placing guide is supported in a warped posture so that a sheet folding position protrudes toward the folding roll means. The staple member restricts the lifting of the rear end portion of the sheet bundle on the sheet placement guide during a stapling operation for binding the sheet bundle supported by the sheet placement guide by the stapling means. Item 4. The sheet post-processing apparatus according to Item 3. The sheet leading edge regulating means includes a locking member for locking the sheet leading edge and a grip member for gripping the sheet,
5. The sheet post-processing according to claim 3, wherein the sheet grip member grips at least a sheet bundle leading end when the sheet bundle on the sheet placement guide is moved from the binding position to the folding position. apparatus. An image forming apparatus for sequentially forming images on sheets;
A sheet post-processing device that performs a binding process and / or a folding process on a sheet from the image forming apparatus,
An image forming system comprising the sheet post-processing apparatus having the configuration according to any one of claims 1 to 5.

Images