JP5418077B2 - Image forming system - Google Patents

Description

  The present invention relates to a sheet processing apparatus that is provided integrally or separately in an image forming apparatus such as a copying machine, a printer, or a printing machine, and that performs predetermined post-processing on a sheet on which an image has been formed, and discharges the sheet. The present invention relates to an image forming system including an apparatus and an image forming apparatus.

Conventionally, predetermined post-processing is performed on image-formed paper (recording medium) that is provided integrally or separately in an image forming apparatus such as a copier, printer, or printing machine and is discharged from the image forming apparatus. For example, a paper processing apparatus that discharges paper by stacking, aligning, binding, saddle stitching, folding, and the like is known (Patent Documents 1, 2, and 3).
An image forming system is constructed by assembling the sheet post-processing apparatus to the image forming apparatus (main body).
However, the conventional sheet post-processing apparatus is generally arranged in the horizontal direction of the image forming apparatus main body, and there is a problem that the occupied area of the entire image forming system increases. In particular, when a post-processing device having a saddle stitch processing function and various folding processing functions is incorporated, there is a problem that the occupied area becomes large.

  The present invention has been made in view of the above, and in a sheet post-processing apparatus provided in an image forming apparatus, an area occupied by the entire apparatus system is increased while having a saddle stitch processing function and various folding processing functions. An object of the present invention is to provide an image forming system that prevents the above-described problem.

To achieve the above object, an image forming system according to a first aspect of the present invention includes an image forming apparatus that forms an image on a sheet, and a sheet that performs post-processing on a sheet conveyed from the image forming apparatus. In the image forming system including the post-processing device, the paper post-processing device is configured to align the sheet bundle by stacking the sheets on the alignment tray, and to the sheet bundle aligned by the alignment unit. A binding processing unit that performs binding processing, and the binding processing unit includes an end binding unit that binds an end portion of the sheet bundle, and a saddle stitching unit that binds a center portion of the sheet bundle, The sheet post-processing device includes a half- fold processing unit that folds a center portion of the saddle-stitched sheet bundle in a sheet conveyance direction, a first discharge tray that accommodates the edge-bound sheet bundle, and the center-folded sheet bundle. The second output tray that holds the bundle of paper Comprising, an image forming system, characterized in that it is arranged below the image forming apparatus.
請 Motomeko 2 of the invention, the in folding section has a configuration in which folding the intermediate portion of the sheet bundle horizontally held above, the binding processing unit, a staple housing portion detachable, and extrusion and a driver portion provided, and a clincher portion for bending the distal end of said staple, said driver unit, the second is arranged below the paper discharge tray, the second tray, or open and close a portion thereof By doing so, the staple needle accommodating portion can be exchanged.

According to a third aspect of the present invention, the distance from the binding position of the binding processing section to the open / close door provided downstream of the binding position in the paper transport direction and on the front of the apparatus is set to approximately ½ of the maximum paper length. It is characterized by being.
According to a fourth aspect of the present invention, the sheet bundle after the saddle stitching process is introduced from the nip portion of the pair of folding paper discharge rollers that introduces the second bundle of paper discharge trays to the downstream side of the sheet conveyance direction from the nip portion and the front of the apparatus. The distance to the open / close door provided in is set to approximately ½ or more of the maximum sheet length.
According to a fifth aspect of the present invention, a folding unit is arranged upstream of the aligning unit, and when the sheet conveyed from the image forming apparatus is not folded, the sheet is conveyed to the aligning unit while folding is performed. When the sheet is introduced into the folding unit and Z-folding is performed by the folding unit, the Z-folded paper is conveyed to the aligning unit and aligned, and then the binding processing unit terminates the end. After performing the binding process, the sheet is discharged to the first discharge tray , and when folding processing other than Z-folding is performed by the folding unit, the folded paper is conveyed to the aligning means for alignment. Then, after the binding processing unit performs the binding process, it is discharged to the second discharge tray .

According to a sixth aspect of the invention, in place of the folding processing section and the binding processing section, a large-capacity first discharge tray can be arranged, and an end binding unit can be attached to and detached from the alignment means. It is characterized by that.
A sheet post-processing apparatus according to a seventh aspect of the present invention includes a pair of conveying rollers arranged to face each other across a conveying path for conveying the sheet bundle aligned in the aligning unit to the binding processing unit. The conveyance roller is a drive roller.

In the sheet post-processing apparatus according to an eighth aspect of the present invention, the aligning unit includes a sheet trailing edge fence for positioning the sheet trailing edge, and the sheet trailing edge fence is positioned between the sheet trailing edge fence and the folding position by the middle folding processing unit. The distance is set to approximately ½ of the maximum sheet length.
The invention of claim 9, wherein the sheet post-processing hole so as not to load the conveying device sheet bundle door of the front or end sheaf discharging consisting out come Ru door to push open from the inside by the sheet bundle, A feature is provided.

According to the first aspect of the present invention, the sheet post-processing apparatus that has been able to perform the saddle stitching process can be disposed within the installation area of the image forming apparatus, and an image forming system that does not have an extra occupied space can be provided.
Further , in the post-processing apparatus disposed under the image forming apparatus, by arranging the folding processing unit on the upstream side and the binding processing unit on the downstream side, it is possible to secure a space in which the stack tray of the saddle-stitched sheet bundle can be built. .
According to the second aspect of the present invention, by disposing the driver unit provided with the staple needle accommodating part and the pushing part of the stapler under the middle folded stack tray, the staple folded needle storage is achieved by opening and closing the middle folded stack tray. The staples can be exchanged from the front surface of the post-processing apparatus.

According to the invention of claim 3 , by setting the distance from the binding position of the staple unit to the open / close door provided on the front surface portion of the sheet post-processing apparatus to be approximately ½ of the maximum sheet length, The saddle stitching process can be performed without opening and closing the front door of the sheet post-processing apparatus.
According to the fourth aspect of the present invention, the distance from the sheet discharge roller nip portion of the sheet bundle after the saddle stitching process to the open / close door of the front portion of the sheet post-processing apparatus is set to 1/2 or more of the maximum sheet length. During saddle stitching, saddle stitching processing can be performed without opening and closing the front door of the sheet post-processing apparatus.
According to the invention of claim 5 , it is possible to discharge the paper stack at the time of folding processing and the paper stack at the time of saddle stitching to a common tray, and to obtain a stacking method for reducing the size.

According to the invention of claim 6, in place of the binding processing unit and the folding processing unit capable of end binding and saddle stitching, a large-capacity end binding stack tray is arranged, and the end binding unit is arranged with respect to the aligning means. Since it is configured to be detachable, it is possible to switch between the two components, and it is possible to easily create a sheet post-processing device that only binds edges and a sheet post-processing device that can be saddle-stitched and edge-bound. The user's request can be satisfied with the cost.
The folding unit and the binding processing unit are integrated so that they can be attached / detached, and a binding processing unit that can be attached / detached can be added to the end of the paper aligning means. An image forming system capable of reducing the cost by removing the binding processing unit and adding a stapler for end binding and stacking the maximum sheet bundle in the apparatus at the end binding is provided.
According to the invention of claim 7 , the transport rollers that transport the paper to the binding position in a bundled state are a pair of transport rollers disposed across the transport path, and by driving both transport rollers, It is possible to obtain a conveyance method that can convey the sheet bundle with little deviation during horizontal conveyance.
According to the invention of claim 8 , the depth length of the apparatus can be minimized by setting the distance from the paper trailing edge fence of the aligning means to the folding position to ½ of the maximum paper length. .
According to the invention of claim 9, door in the end binding output portion of the front of the door of the sheet post-processing apparatus, Ru came out of the pushed open from the inside by the bore or sheet bundle, so as not to load the conveyance of the sheet By providing the sheet bundle, it is possible to discharge the sheet bundle without opening the front door of the sheet post-processing apparatus when the maximum length end binding is performed.

1 is an overall configuration explanatory view showing a configuration of an image forming system according to a first embodiment of the present invention. FIG. 5 is an overall configuration explanatory diagram illustrating a configuration of an image forming system according to a second embodiment of the present invention. FIG. 9 is an overall configuration explanatory diagram illustrating a configuration of an image forming system according to a third embodiment of the present invention. FIG. 10 is an overall configuration explanatory diagram showing a configuration of an image forming system according to a fourth embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
FIG. 1 is a front longitudinal sectional view showing an overall configuration of an image forming system including a sheet post-processing apparatus according to a first embodiment of the present invention.
The sheet post-processing apparatus 1 and the image forming apparatus (copier, printer, printing apparatus, etc.) 100 constitute an image forming system.
The image forming apparatus 100 opens and closes an opening / closing door 101 provided on the front surface (right side of the drawing) of the apparatus to replenish paper disposed inside (replenishment by pulling out a paper feed tray, etc.) and replacement of consumables. It is a type that can perform operations such as replenishment. The image forming apparatus 100 includes a paper feed tray 105, an image forming unit 106, an optical writing unit 107, a paper discharge path 108, and the like.
The sheet post-processing apparatus 1 is disposed below the image forming apparatus 100, and includes an inlet 2 for introducing the sheet P conveyed from a discharge port 102 provided at the rear lower part of the image forming apparatus, and an inlet conveying roller 3. An alignment unit 10 that is arranged on the downstream side of the introduction path 4 and sequentially conveys and stacks sheets on the alignment tray 11 to form a sheet bundle, and the front end of the apparatus after the edge binding process or the saddle stitching process is performed on the sheet bundle. A binding processing unit 20 that discharges (to the right of the drawing), a folding processing unit (center folding processing unit) 30 that performs folding processing on the sheet bundle that has undergone binding processing (edge binding, saddle stitching) in the binding processing unit 20, and And control means for controlling these. The center folding processing unit is a means for folding the center portion of the sheet bundle in the sheet transport direction.

The aligning unit 10 aligns the paper transport direction and the width direction (direction orthogonal to the transport direction).
The binding processing unit 20 includes an end binding unit that binds the end of the sheet bundle and a saddle stitching unit that binds the center of the sheet bundle. The aligning means includes a driver portion 21 provided with a staple needle accommodating portion and a push-out portion on the upper side, and a clincher portion 22 for bending the tip of the staple needle on the lower side.
The edge-bound sheet bundle bound by the binding processing unit 20 is stored in the edge-bound stack tray (first discharge tray) 25, and the sheet-bound sheet bundle is folded in the middle and then the saddle-stitch stack tray (second sheet). The trays 25 and 26 are separated from each other. That is, the end binding stack tray 25 is disposed on the downstream side (right side) of the binding processing unit 20, and the half-fold stack tray 26 is disposed above the end binding stack tray 25.
The folding processing unit 30 is a half-folding processing unit disposed upstream of the binding processing unit 20 for folding the sheet bundle that has undergone the binding processing. When performing the folding processing, the folding processing unit 30 receives the saddle stitching. The sheet bundle is conveyed backward from the binding processing unit 20 to the center folding processing unit.

The paper post-processing apparatus 1 is attached to the lower part of the image forming apparatus 100, and the recording medium (paper) discharged from the lower rear part of the image forming apparatus is guided into the paper post-processing apparatus 1. The sheet transported onto the alignment tray 11 by the entrance transport roller 3 is aligned on the alignment tray in the direction (width direction) perpendicular to the sheet transport direction by the jogger fences 12 on the front side and the back side, and moves in the transport direction. Is aligned with the back roller 13 as a reference.
After the sheet bundle is aligned on the alignment tray 11 in the conveyance direction and the width direction, the movable bundle conveyance roller 40 located on the upper side moves toward the fixed bundle conveyance roller 41 located on the lower side, and the sheet bundle between the two rollers. Is held and conveyed to the downstream binding processing unit 20. Here, the bundle conveying roller pairs 40 and 41 are both driving rollers that are driven by the driving force from the motor, and improve the conveying quality (feeding accuracy / sheet misalignment accuracy). Here, the movable bundle conveyance roller 40 is movable up and down toward the fixed bundle conveyance roller 41, and the movable bundle conveyance is performed so that the conveyance force is applied to the sheet after the sheet has passed the nip position between the rollers 40 and 41. The roller is configured to nip the fixed bundle conveying roller.

When the end binding is performed by the binding processing unit 20, the stapling process is performed at a predetermined position and then conveyed downstream, and is discharged and stacked on the end binding stack tray 25 by the end binding discharge roller pair 45. .
When saddle stitching is performed by the binding processing unit 20, after the sheet bundle is aligned, the movable bundle conveyance roller 40 is similarly lowered onto the fixed bundle conveyance roller 41, and the sheet bundle is sandwiched between both rollers. The sheet is held and conveyed to the downstream binding processing unit 20 and the binding process is performed at the saddle stitching position. When the saddle stitching process is completed, the bundle conveying rollers 40 and 41 return the sheet to the upstream folding position, and the folding plate 31 and the folding roller pair 32 constituting the folding processing unit 30 perform the middle folding process. The paper is discharged and stacked on the folded folding tray 26 by the folding paper discharge roller 33. That is, the folding plate 31 is configured to be movable up and down at the center folding position, and projects in the middle of the sheet bundle by projecting between the pair of folding rollers 32 juxtaposed on the upper surface of the sheet bundle. It is configured.
As described above, according to the present invention, the sheet post-processing apparatus 1 can be disposed under the image forming apparatus 100, and can be disposed without enlarging the installation area.

In addition, since the edge-binding stack tray 25 and the half-fold stack tray 26 are configured separately and the center-fold stack tray 26 is disposed on the edge-binding stack tray 25, sheet bundles having different binding states and folding states may be mixed. And an increase in the area occupied by the apparatus can be prevented.
Since the folding processing unit 30 (folding plate 31, folding roller 32, etc.) is arranged upstream of the binding processing unit 20, the folding processing can be performed behind the intermediate position in the front-rear direction of the apparatus, and therefore the front of the folding processing unit 30. The trays 25 and 26 for stacking the sheet bundle after the saddle stitching process and the folding process can be provided in the front space.
Further, a staple needle storage portion of the binding processing unit 20 is disposed below the middle folding stack tray 26, and at least a part of the middle folding stack tray is opened and closed as indicated by a broken line so that the front portion of the apparatus can be opened. The staple needle housing portion is configured to be exchangeable. Here, a part of the middle folding stack tray is opened and closed, but the whole middle folding stack tray may be opened and closed.

Further, post-processing is possible by setting the distance L1 from the binding position of the binding processing unit 20 to the open / close door 6 on the front surface of the paper post-processing device to be approximately ½ of the maximum paper length to be post-processed. Even during saddle stitching of the maximum paper size, saddle stitching processing can be performed without opening the front door 6.
Similarly, the saddle stitching is performed with the door 6 closed by setting the distance L2 from the nip position of the sheet folding roller 33 to the door 6 of the sheet post-processing device to be equal to or greater than ½ of the maximum sheet length. The bundled sheets or the folded sheets can be stacked in the half-fold stack tray 26, respectively.
Further, if the distance L3 from the trailing edge fence 14 of the aligning means 10 to the folding position is at least half of the maximum sheet length, it can be folded in the middle, and the apparatus can be set by setting the distance L3 to the distance L3. Downsizing (reducing the longitudinal dimension) is possible.

Next, FIG. 2 shows a configuration example in which the folding unit is arranged in the sheet post-processing apparatus.
In the sheet post-processing apparatus 1, the folding unit 50 is arranged upstream of the aligning unit 10 (in the middle of the introduction path 4), and the folding process is not performed on the sheet conveyed from the image forming apparatus 100. On the other hand, while the sheet is conveyed to the aligning means 10, it is controlled so as to be introduced into the folding unit 50 when folding is performed.
When the Z-folding is performed by the folding unit 50, the Z-folded paper is conveyed to the aligning unit 10 and aligned, and then the end-binding process is performed by the binding processing unit 20 and then the end-binding stack tray 25 is loaded. Discharge.
When folding processing other than Z-folding is performed by the folding unit 50, the folded paper is conveyed to the aligning means 10 for alignment, and then the binding processing unit 20 performs binding processing, and then the middle folding stack It is discharged to the tray 26.

In the above configuration, the large-size (for example, A3 size) paper P discharged from the lower rear portion of the image forming apparatus 100 into the paper post-processing apparatus 1 is guided into the folding unit 50 by the entrance conveyance roller 3. When there is no need for folding processing, the sheet is conveyed as it is and conveyed to the aligning means 10.
When performing edge binding with the A3 size aligned to the A4 size, it is necessary to fold the A3 paper into the A4 size by Z-folding, and the A3 paper introduced from the entrance transport roller is folded by the switching operation by the switching claw 51. It is conveyed to the unit 50. The switching claw 51 is held in a posture for guiding the paper to the aligning means 10 by a spring (not shown), and is turned by turning on a solenoid (not shown) to switch the paper to the folding unit 50. If the solenoid is OFF, the paper is sorted so as to be conveyed downward.
The folding unit 50 includes a first transport unit 52, a second transport unit 53, a third transport unit 54, and a fourth transport unit 55, and an upper end stopper 53a and a rear end stopper 54a provided in the second and 353, 54, respectively. And first and third folding rollers 56, 57, 58, a pressure roller 59, and a branch claw 60.

  First, the upper end stopper 53a and the rear end stopper 54a are moved to predetermined positions in the respective transport units 53 and 54 by a stepping motor (not shown) according to the difference in folding size and folding type. The sheet is conveyed by the pressure roller 59 and the first folding roller 56 into the second conveying unit 53 provided with the upper end stopper 53a, and continues to be conveyed even after the leading end of the sheet contacts the upper end stopper 53a. A bending part is generated. The formed bent portion is finally held by the first folding roller 56 and the second folding roller 57 to be folded for the first time, and this folded portion is the third conveyance provided with the rear end stopper 54a. It is conveyed toward the section 54. By continuing the conveyance even after the folded portion of the folded and conveyed paper hits the rear end stopper 54a, the rear portion is bent similarly to the first folding. The bent portion is finally held between the second folding roller 57 and the third folding roller 58, and the second folding is performed. The sheet that has been Z-folded by such a procedure is guided to the fourth transport section 55 by the branching claw 60, transported and aligned by the aligning means 10, and then subjected to the end binding process, and then the end binding stack tray 25. To be discharged.

Note that when the folding unit 50 performs outer three-fold, inner three-fold, two-fold, and four-fold, the paper transported from the entrance transport roller to the folding unit is transported to the folding section by the switching claw, and the paper size and folding type Thus, the upper end stopper 53a and the rear end stopper 54a are respectively moved to predetermined positions, and the folding process is performed by the same folding operation as the Z-folding. The paper after the folding process is conveyed to the middle folding stack tray 26 side by the branching claws, and is ejected and stacked on the middle folding stack tray by the middle folding paper discharge roller 33.
In this way, the folding unit 50 is disposed at the upper part of the space in the sheet post-processing apparatus 1, the binding processing unit 20 is disposed at the lower part, and the folding direction at the time of the folding by the folding processing unit 30 is set to the upper side. The stack tray at the time of independent folding (outer 3 fold, inner 3 fold, 2 fold, 4 fold, etc.) can be shared by the middle fold stack tray 26 at the time of saddle stitch folding, and the size can be reduced.

Next, FIG. 3 shows an image forming system including a sheet post-processing apparatus according to another embodiment of the present invention, and the configuration shown in FIG. 2 (folding processing unit 30, plus, edge stitching and saddle stitching is possible). This shows that the binding processing unit 20) and the configuration shown in FIG. 3 (dedicated to the end binding processing unit) can be created alternately.
That is, in the configuration of FIG. 2, in addition to the folding processing unit 30, the binding processing unit 20 capable of end binding and saddle stitching is arranged in the front-rear direction along the bottom surface of the apparatus, but a user who only needs end binding. Therefore, there is a demerit that the space of the end binding stack tray 25 is narrowed. Accordingly, while aligning the same sheet post-processing apparatus casing and other configurations as they are, the folding processing unit 30 and the binding processing unit 20 are removed and the large-capacity end binding stack tray 25 is disposed, and the aligning unit 10 is arranged. The end binding unit 23 is configured to be detachable from the rear end fence 14. Therefore, the configuration of FIG. 2 and the configuration of FIG. 3 can be switched to each other, and it becomes possible to easily create a sheet post-processing device with only edge binding and a paper post-processing device capable of saddle stitching and edge binding, It is possible to satisfy the user's request quickly and at low cost. In the apparatus configuration of FIG. 3 as well, if the folding unit 50 is used, the middle folding is possible.

Further, in the case of the sheet post-processing apparatus capable of saddle stitching and edge binding shown in FIG. 2, the distance from the binding position to the front door of the sheet post-processing apparatus is shorter than the maximum size of the sheet. In order to stack a bundle of sheets on the edge binding stack tray 25, it is necessary to open the front opening / closing door 6. However, in order to prevent the edge binding from interfering with the front opening / closing door, Alternatively, as shown in FIG. 4, by arranging the small door 6a that is pushed by the sheet bundle and opened, it is possible to stack the edge-bound sheet bundle with the front open / close door closed.
As described above, according to the present invention, a sheet post-processing apparatus that can perform saddle stitching processing can be disposed within an installation area of the image forming apparatus, and a sheet post-processing apparatus and an image forming system that do not have an extra occupied space are provided. Can be provided.

Further, in the post-processing apparatus disposed under the image forming apparatus, by arranging the folding processing unit on the upstream side and the binding processing unit on the downstream side, it is possible to secure a space in which the stack tray of the saddle-stitched sheet bundle can be built. .
In addition, by disposing the driver section with the staple needle storage section and the push-out section under the center folding stack tray, the staple storage section can be exchanged by opening and closing the middle folding stack tray. The staples can be exchanged from the front of the aftertreatment device.
In addition, by setting the distance from the binding position of the staple unit to the open / close door provided on the front surface of the paper post-processing apparatus to be approximately ½ of the maximum paper length, the front of the paper post-processing apparatus can be used during saddle stitching. The saddle stitching process can be performed without opening and closing the door.
In addition, the distance from the discharge roller nip portion of the sheet bundle after the saddle stitching process to the open / close door of the front face of the sheet post-processing apparatus is set to 1/2 or more of the maximum sheet length, so that the sheet The saddle stitching process can be performed without opening and closing the front door of the processing apparatus.
Further, it is possible to obtain a stacking method in which the paper stack at the time of folding and the paper stack at the time of saddle stitching can be discharged to a common tray, and the size can be reduced.

Further, instead of the binding processing unit and the folding processing unit capable of edge binding and saddle stitching, a large-capacity edge binding stack tray is arranged, and the end binding unit is configured to be detachable with respect to the alignment means. Both configurations can be switched to each other, and it is possible to easily create a paper post-processing device that only binds edges and a paper post-processing device that can be saddle-stitched and edge-bound, which can meet user demands quickly and at low cost. I can do it.
In addition, the folding unit and the binding processing unit are integrated so that they can be attached and detached, and a binding processing unit that can be attached and detached can be added to the end of the paper aligning means. By removing the unit and the binding processing unit and adding an end binding stapler, the cost can be reduced, and the maximum sheet bundle can be stacked in the apparatus during the end binding.
In addition, the transport rollers that transport the paper to the binding position in a bundled state are a pair of transport rollers arranged with the transport path in between, and by driving both transport rollers, It is possible to obtain a transport method capable of transporting with less deviation.
Further, the folding processing unit disposed upstream of the binding processing unit can be folded at a substantially central portion of the sheet bundle, thereby obtaining a sheet post-processing device that performs folding at the center of the saddle stitching.
Further, the depth length of the apparatus can be minimized by setting the distance from the trailing edge fence of the aligning means to the folding position to ½ of the maximum sheet length.
In addition, the edge binding discharge part of the open / close door on the front of the paper post-processing device is provided with a hole or a door that can be pushed open from the inside by a bundle of paper so as not to be a load of paper transport, so that the maximum length end When the binding is performed, the sheet bundle can be discharged without opening the front door of the sheet post-processing apparatus.

DESCRIPTION OF SYMBOLS 1 ... Paper post-processing apparatus, 2 ... Inlet port, 3 ... Inlet conveyance roller, 4 ... Introduction path, 6 ... Opening / closing door, 10 ... Alignment means, 11 ... Alignment tray, 12 ... Fence, 13 ... Roller, 14 ... Rear end Fence, 20 ... binding processing section, 21 ... driver section, 22 ... clincher section, 25 ... end binding stack tray, 26 ... center folding stack tray (saddle binding stack tray), 30 ... folding processing section, 31 ... folding plate, 32 ... Folding roller, 33 ... Medium folding paper discharge roller, 40, 41 ... Bundle conveying roller pair, 45 ... Discharge roller pair, 50 ... Folding unit, 51 ... Switching claw, 52 ... Conveying part, 53 ... Conveying part, 53a ... Upper end stopper 54... Conveying section 54 a. Rear end stopper 55 55 Conveying section 56, 57, 58. Folding roller 59 59 Pressure roller 60 Branching claw 100 Image forming apparatus 101 Opening / closing door 102 ... Outlet, 105, ... feed tray, 106 ... image forming unit, 107 ... unit, 108 ... discharge path

Patent No. 3940008 JP 2007-161468 A Patent No. 3979773

Claims (9)

An image forming system comprising: an image forming apparatus that forms an image on a sheet; and a sheet post-processing apparatus that performs post-processing on a sheet conveyed from the image forming apparatus.
The sheet post-processing device includes an alignment unit that stacks sheets of paper on an alignment tray and aligns the sheet bundle, and a binding processing unit that performs a binding process on the sheet bundle aligned by the alignment unit,
The binding processing unit includes an end binding unit that binds an end portion of the sheet bundle, and a saddle stitching unit that binds a central portion of the sheet bundle,
The sheet post-processing apparatus includes a center folding processing unit configured to center-fold a center portion of the saddle-stitched sheet bundle in a sheet conveyance direction, a first discharge tray that accommodates the end-bound sheet bundle, and the center folding. And a second paper discharge tray for storing the bundle of paper sheets, and the image forming system is disposed below the image forming apparatus. The half-fold processing unit includes a configuration in which an intermediate part of a horizontally held sheet bundle is folded upward,
The binding processing section includes a detachable staple needle housing section, a driver section provided with an extrusion section, and a clincher section that bends the tip of the staple needle,
It said driver unit is disposed below the second tray, the second tray, or by opening and closing a portion thereof, and characterized by being configured to be able to exchange the staple housing unit The image forming system according to claim 1 . The distance from the binding position of the binding processing unit to the opening / closing door provided downstream of the binding position in the paper transport direction and on the front of the apparatus is set to approximately ½ of the maximum paper length. The image forming system according to claim 1 or 2 . From the nip portion of the pair of folded paper discharge rollers for introducing the bundle of sheets after the saddle stitching process to the second discharge tray , to the opening / closing door provided downstream of the nip portion in the sheet conveyance direction and on the front of the apparatus. distance, the image forming system according to any one of claims 1 to 3, characterized in that it is set to about 1/2 or more of the maximum sheet length. A folding unit is arranged upstream of the aligning unit, and when the sheet conveyed from the image forming apparatus is not folded, the sheet is conveyed to the aligning unit, whereas when folding is performed, the folding unit is arranged. In the unit,
When the folding unit performs Z-folding, the Z-folded sheet is conveyed to the aligning unit, aligned, and then subjected to edge binding processing by the binding processing unit, and then the first discharge tray. Discharged into
When a folding process other than Z-folding is performed by the folding unit, the folded sheet is conveyed to the aligning unit and aligned, and then the binding process unit performs the binding process, and then the second process is performed . The image forming system according to any one of claims 1 to 4 , wherein the image forming system discharges the sheet to a discharge tray . In place of the folding processing unit and the binding processing unit, a large-capacity first discharge tray is configured to be disposed, and an end binding unit is configured to be detachable from the alignment unit. Item 6. The image forming system according to any one of Items 1 to 5 . A pair of conveyance rollers disposed opposite to each other with a conveyance path interposed therebetween for conveying the sheet bundle aligned by the alignment unit to the binding processing unit, wherein each of the conveyance rollers is a driving roller. Item 7. The image forming system according to any one of Items 1 to 6 . The alignment means includes a paper trailing edge fence for positioning the paper trailing edge,
The distance between the folding position by the processing unit folding in the said paper trailing edge fence any one of claims 1 to 7, characterized in that it is set to about 1/2 of the maximum sheet length To image forming system. Characterized by providing an end sheaf discharging unit consisting out come Ru door to push open from the inside by the hole or the sheet bundle, so as not to load the conveyance of the sheet bundle door of the sheet post-processing device front The image forming system according to any one of claims 1 to 8 .

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