JP2017071460A - Sheet processing device and image formation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deviation of binding position of a sheet in a case where a binding process is made under a condition in which the sheet is supported by two support parts.SOLUTION: A sheet processing device includes a saddle riding part 321 in which a sheet in a mountain-like form with a crease being formed is saddle-ridden, for supporting from below, a staple driving part 325 for driving a staple to a sheet that is supported by the saddle riding part 321, a push-out part 322 for pushing out the sheet from the saddle riding part 321 by pushing a rear end part in transportation direction of the sheet supported by the saddle riding part the part 321 toward a crease part, and a moving saddle 332 which supports, from below, the sheet being pushed out from the saddle riding part 321 by the push-out part 322. The moving saddle 332, when driving a binding staple at the staple driving part 325, only supports a front end part in transportation direction of the sheet having been pushed out from the saddle riding part 321.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a sheet processing apparatus and an image forming system.

  2. Description of the Related Art Conventionally, a saddle-shaped placement portion that supports a folded portion of a folded sheet from below and a binding portion that faces the placement portion, the sheet is placed on the placement portion in a ridge line direction of the placement portion. An apparatus having a configuration in which a binding needle is driven at a plurality of positions on a sheet of paper is known (for example, see Patent Document 1).

  In such an apparatus, as shown in FIG. 11, the sheet that protrudes from the placement unit 91 when moved on the placement unit 91 is lowered by the second placement unit 92 adjacent to the placement unit 91. Supported by. When the binding needles are driven into all the binding positions set for the sheet by the binding unit 93 on the placement unit 91, the entire sheet is placed by the second placement unit 92 from the placement unit 91. The second placement unit 92 that has been transported to the supported position and then supported the entire surface of the sheet slides in the direction intersecting the ridge line direction (the front side of the sheet), and the subsequent processing unit The paper is transported up to.

Japanese Patent Laying-Open No. 2015-51821

  However, in the apparatus configured as described above, since the second placement unit is configured to slide, the position of the ridge line between the placement unit 91 and the second placement unit 92 may be shifted. is there. When the position of the ridge line between the placement unit 91 and the second placement unit 92 is shifted, when the sheet protruding from the placement unit 91 is placed on the second placement unit 92, FIG. As shown, since the paper is inclined as the paper moves along the second placement portion 92, the binding position may be shifted when the binding needle is driven. Such a phenomenon is particularly remarkable when the paper is light in weight, or when most of the paper is placed on the second placement portion 92.

  The present invention has been made in view of such a problem, and in the case of performing the binding process in a state where the sheet is supported by the two support portions, the sheet processing apparatus and the image capable of suppressing the binding position deviation of the sheet. An object is to provide a forming system.

To solve the above problem,
According to one aspect of the present invention, a sheet processing apparatus includes:
A first support part for hooking and supporting the sheet in a chevron state in which a fold part is formed;
A stapling portion for driving a binding needle to the paper supported by the first support portion;
An extruding unit that pushes the rear end of the paper supported by the first support unit in the direction of the crease and pushes the paper out of the first support;
A second support part that supports the paper extruded from the first support part by the push part from below,
The second support portion supports only the front end portion in the transport direction of the sheet pushed out from the first support portion when the binding needle is driven by the hitting portion.

According to another aspect of the present invention, an image forming system includes:
An image forming apparatus for forming an image on paper;
The sheet processing apparatus connected to the image forming apparatus and configured to perform predetermined sheet processing on a sheet on which an image is formed by the image forming apparatus;
It is provided with.

  According to the present invention, when the binding process is performed in a state where the paper is supported by the two support portions, it is possible to suppress the binding position deviation of the paper.

1 is a schematic diagram illustrating an overall configuration of an image forming system. It is a perspective view which shows an example of a structure of the mounting part in a saddle stitching unit, a needle-punching part, and a needle-receiving part. It is the side view which looked at the saddle stitching unit from the front side. 1 is a block diagram illustrating a main configuration relating to operation control of an image forming system. FIG. It is a flowchart which shows the setting process of operation | movement of a moving rod. It is an example which shows the state which the moving rod became the 1st position and supported the conveyance direction downstream side of the paper extruded from a hooking part. It is the schematic diagram which looked at the state of the paper of FIG. 6 from the upper side. FIG. 6 is a schematic diagram illustrating a sheet when a separation distance from a hooking portion of a moving rod is changed. It is an example which shows the state which supported the downstream with respect to the conveyance direction of the sheet | seat extruded from a hooking part, when a moving rod becomes a 2nd position. FIG. 10 is a schematic view of the state of the sheet of FIG. 9 as viewed from above. It is a figure for demonstrating the conventional problem. It is a figure for demonstrating the conventional problem.

  Hereinafter, an image forming system 1 according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing the overall configuration of the image forming system 1.
The image forming system 1 includes an image forming apparatus 100, an intermediate conveyance apparatus 200, a sheet processing apparatus 300, and a side stitching processing apparatus 400.
In the following description, the vertical direction is the Z direction, and the direction along the direction in which the image forming apparatus 100, the intermediate transport apparatus 200, the sheet processing apparatus 300, and the side stitching processing apparatus 400 shown in FIG. A direction perpendicular to the X direction and the Z direction is taken as a Y direction.
Further, the X direction will be described with a front side and a rear side, the Y direction will be described with a right side and a left side, and the Z direction will be described with an upper side and a lower side. Here, the front side is the upstream side in the transport direction in the image forming system 1, and the rear side is the downstream side. Further, the right side is the upstream side in the sheet conveyance direction in the middle folding / saddle stitching process of the sheet processing apparatus 300, and the left side is the downstream side.

The image forming apparatus 100 forms an image on a sheet.
Specifically, the image forming apparatus 100 develops a toner image corresponding to bitmap data on a primary transfer member such as a transfer roller, for example, a paper transport unit that pulls out a paper stock stored as a recording medium from the paper tray and transports it. A developing unit, a primary transfer unit that transfers a toner image developed on the primary transfer member to a secondary transfer member such as the transfer drum 150, and a toner image transferred to the secondary transfer member on a sheet conveyed by a sheet conveying unit. A secondary transfer unit for transferring, a fixing unit for fixing the transferred toner image on the sheet, a discharge unit for discharging the sheet after fixing processing by the fixing unit, and the like are provided, and an image is formed on the sheet.
In addition, the image forming apparatus 100 delivers the sheet on which the image is formed and discharged to the intermediate transport apparatus 200. In other words, the image forming system 1 is connected so that the sheet discharged from the image forming apparatus 100 is delivered to the intermediate conveying apparatus 200.

The intermediate transport apparatus 200 is an apparatus that can temporarily wait for a sheet and can perform creasing and cutting on the sheet.
Specifically, for example, the intermediate conveyance device 200 conveys the sheet conveyed from the image forming apparatus 100 so as to be lowered, and temporarily stops and waits in a state where the sheet surface of the sheet is substantially along the Z direction. Section (stacker), intermediate alignment section that aligns the position of the standby paper, a creasing section that crates the aligned paper, and the margin of the paper while conveying the creasing paper A blank cutting part (slitter) or the like for cutting a part is provided.
That is, the intermediate conveyance device 200 performs alignment by the intermediate alignment unit in a state where the paper delivered from the image forming apparatus 100 is temporarily stopped at the standby unit, and then performs the creasing process by the creasing unit, The margin portion of the sheet is cut by the margin cutting unit while the attached sheet is conveyed. Thereafter, the intermediate conveyance device 200 delivers the paper whose margin portion has been cut by the margin cutting portion to the paper processing device 300.
The intermediate conveyance device 200 can also deliver the paper delivered from the image forming apparatus 100 to the paper processing device 300 without performing some or all of the various processes performed by the intermediate conveyance device 200.

The sheet processing apparatus 300 performs a half-folding process for folding a sheet into two (folded), a saddle stitching process for creating a saddle-stitched booklet by overlapping and binding a predetermined number of the folded sheets, and a small-edge cutting of the saddle-stitched booklet. Is an apparatus for performing a cutting process for performing a square back forming process for forming a back cover of a saddle stitch booklet.
Specifically, for example, the sheet processing apparatus 300 superimposes the sheet folded from the intermediate folding unit 310 and the sheet folded from the intermediate folding apparatus 310 by folding the sheet delivered from the intermediate conveyance apparatus 200 along the Y direction. A saddle stitching section 320 that forms a saddle stitching booklet, a saddle stitching section 320 that receives the saddle stitching booklet bound by the saddle stitching section 320, and transports the saddle stitching booklet in a direction (X direction) perpendicular to the fold portion in a horizontal plane; A clamp unit 340 that sandwiches and holds the vicinity of the fold portion of the saddle-stitched booklet conveyed by the conveyance unit 330, a cutting unit 350 that performs cutting processing of a small edge of the saddle-stitched booklet held by the clamp unit 340, and the back of the saddle-stitched booklet A corner spine forming unit 360 that performs a corner spine forming process of the cover, a discharge unit 370 that discharges the saddle stitch booklet to the outside, and the like are provided.
The sheet processing apparatus 300 may transfer the sheet delivered from the intermediate conveyance apparatus 200 to the side stitching processing apparatus 400 without performing some or all of the various processes performed by the sheet processing apparatus 300. it can.

The middle folding section 310 is disposed, for example, along a YZ plane that is positioned below the pair of middle folding rollers and is positioned below the pair of middle folding rollers and that can be operated to enter between the pair of middle folding rollers. A plate-shaped folding knife.
The paper delivered from the image forming apparatus 100 is transported to a position where the central portion in the X direction of the paper faces the folding knife. Then, the folding knife enters between the pair of middle folding rollers and performs an operation of pushing the paper into the nip portion. As a result, the sheet is folded in a state in which a crease portion along the Y direction is formed at the contact position with the folding knife. In other words, the paper has a so-called mountain fold shape (mountain paper) with the crease portion on the upper side and the fore ends of both ends thereof on the lower side.
The folded sheet is conveyed in a direction along the fold (Y direction) by a sheet conveying unit (not shown) and reaches the saddle stitching unit 320.

  FIG. 2 is a perspective view showing an example of the configuration of the saddle stitching section 320 and the transport section 330. FIG. 3 is a view of the saddle stitching section 320 and the transport section 330 as viewed from the front side.

  The saddle stitching portion 320 is folded halfway by the middle folding portion 310 and then a hooking portion (first support portion) 321 that stacks and stacks sheets conveyed in a direction along the fold portion (Y direction). , A pushing portion 322 provided at the right end portion of the hooking portion 321, and a transfer portion 323 that is supported by the guide rail L and can move from the vicinity of the left end portion of the hooking portion 321 to the central portion above the hooking portion 321. Further, the abutting portion 324 provided further downstream of the transport portion 323 in the sheet conveying direction, the needle hitting portion 325 provided above the hooking portion 321, and the needle receiver provided inside the hooking portion 321. Part 326 and the like.

The hooking portion 321 has a convex shape with an upper portion of an angle of approximately 90 °, and is placed on the upper portion of the hooking portion 321 so as to straddle a mountain-folded sheet conveyed from the middle folding portion 310.
With the paper corresponding to the innermost page of the booklet to be formed on the bottom surface, the paper forming one booklet is discharged to the hooking portion 321 every time the folding process is completed and sequentially placed.

The pushing part 322 is provided at the upper right end of the hooking part 321 so as to be movable in the Y direction along the top edge line of the hooking part 321.
When a sheet is placed on the hooking unit 321, the push-out unit 322 moves in the Y direction (left direction) on the top ridge line of the hooking unit 321 and moves to the upstream end of the sheet in the conveying direction (conveying direction). The rear end) is pushed out, the paper is conveyed to a predetermined position, and the upstream end of the paper in the conveyance direction is positioned and aligned. The predetermined position is a position where the binding position of the paper faces the needle hitting part 325 and the needle receiving part 326. One or a plurality of binding positions can be set. When a plurality of binding positions are set, the push-out unit 322 moves the binding needle in order from the binding position downstream in the transport direction. The paper is gradually conveyed so as to face the needle hitting unit 325 and the needle receiving unit 326 in order from the binding position on the downstream side.

The transfer unit 323 waits at a standby position and waits for a sheet conveyed to the hooking unit 321. When the sheet is conveyed to a predetermined position by the push-out unit 322, the end portion on the downstream side in the sheet conveyance direction is tapped. And align the paper.
Further, when the binding needle driving operation for all the binding positions of the sheet is completed, the transfer unit 323 moves to the right along the guide rail L extending along the Y direction above the hooking unit 321. After the paper (saddle binding booklet) in which the binding needle is driven is turned to the upstream side in the transport direction, the paper contacts the upstream end of the paper in the transport direction, and is pushed downstream (leftward) in the transport direction. The sheet is conveyed to a position where the entire sheet is placed on a moving rod 332 (described later) of the conveying unit 330.

  When the saddle-stitched booklet is conveyed from the hooking unit 321 to the moving rod 332 by the transfer unit 323, the abutting unit 324 abuts the downstream end in the conveying direction of the saddle-stitched booklet and stops the booklet.

  The needle hitting unit 325 drives a binding needle onto the paper that has been conveyed to a predetermined position of the hooking unit 321.

  The needle receiving portion 326 is installed inside the hooking portion 321 and receives the needle tip of the binding needle driven by the needle hitting portion 325.

  For example, when the saddle stitching unit 320 performs the saddle stitching process, the conveyance unit 330 supports the sheet pushed out from the hooking unit 321 from the inside of the fold part, and after the saddle stitching process, supports the entire sheet. A moving unit U that moves in the X direction (forward direction) and delivers the paper to the clamp unit 340 is provided.

  The moving unit U includes, for example, a flat rectangular parallelepiped pedestal portion 331 that can reciprocate on the support plate S in the X direction and the Y direction, and a moving rod 332 (second support portion) supported by the pedestal portion 331. I have.

During the saddle stitching process of the saddle stitching section 320, the pedestal section 331 is slid in the Y direction (leftward) at a predetermined timing according to the paper condition of the paper into which the binding needle is driven by driving of the drive section 331a (see FIG. 4). To do.
Further, when the moving bar 332 completely supports the paper in which the binding needle is driven, the pedestal portion 331 slides in the X direction (forward direction) to transport the saddle stitch booklet to the next process.

The moving rod 332 is a plate-like member erected along the YZ plane, is provided at the front end of the pedestal portion 331, and moves with the movement of the pedestal portion 331.
When the saddle stitching process of the saddle stitching unit 320 is performed, the moving rod 332 moves the sheet pushed out from the hooking unit 321 by the sheet binding position of the sheet facing the needle hitting unit 325 and the needle receiving unit 326. Support from the inside.
In this embodiment, at this time, the moving rod 332 is controlled to be in either the “first position” or the “second position” according to the sheet condition of the sheet on which the binding needle is driven.
The “first position” means that the sheet slid in the Y direction (left direction) together with the pedestal portion 331 at a predetermined timing, and supports the paper pushed out from the hooking portion 321 only at one point of the moving rod 332 (extruded). This is a position that supports only the front end in the conveyance direction of the sheet. That is, in the “first position”, the contact area between the movable rod 332 and the sheet is reduced.
In addition, the “second position” is a position where the sheet pushed out from the hooking portion 321 is supported by the entire moving rod 332 (the whole pushed sheet is supported).
Details of such control will be described later.
When the binding needle driving operation for all the binding positions of the sheet is completed and the entire sheet is placed on the moving rod 332, the moving rod 332 moves forward together with the pedestal portion 331 to move the sheet to the next. It passes to a process (clamp part 340).

  Returning to FIG. 1, the clamp unit 340 includes two clamping members, clamps the vicinity of the fold portion of the saddle-stitched booklet conveyed forward from the rear by the conveyance unit 330, and removes the saddle-stitched booklet from the cutting unit 350 and the corner back. It is conveyed to the forming unit 360.

  The cutting unit 350 performs a cutting process on the edge portion of the saddle stitched booklet. Thereby, the fore edge portion of the saddle-stitched booklet whose end edge portions are not aligned is trimmed.

  The square spine forming unit 360 is configured to include a holding plate, a roller (none of which is shown), and the booklet that is saddle-stitched as described above is sandwiched between the holding plates, and then a fold portion is formed by the roller. Is crushed to be flat. Thereby, the fold part of the saddle-stitched booklet is formed into a square shape.

  The discharge unit 370 discharges the saddle stitch booklet that has been subjected to the cutting process and / or the square back forming process. Note that the saddle stitch booklet in a state where neither the cutting process nor the square spine forming process is performed may be discharged.

The side stitching processing device 400 performs a side stitching process for a plurality of sheets.
Specifically, the side binding processing device 400 is, for example, a staple processing unit that performs a staple process on a plurality of sheets delivered from the sheet processing apparatus 300, and is parallel to a spine cover among the plurality of sheets subjected to the staple process. In order to align the edges, a page edge trimming unit that cuts off a part of the edge and a discharge unit that ejects sheets after processing by each connected device is provided.
It should be noted that the side stitching processing device 400 can also discharge the paper delivered from the paper processing device 300 without performing some or all of the various processes performed by the side stitching processing device 400.

Next, operation control of the image forming system 1 will be described.
FIG. 4 is a block diagram illustrating a main configuration relating to operation control of the image forming system 1.

  The image forming system 1 receives a user input operation related to the operation of the image forming system 1, and performs an operation display unit 501 that performs display output related to the operation of the image forming system 1, and a center that performs operation control of the entire image forming system 1. A control unit 502, an image formation control unit 503 that performs operation control of the image forming apparatus 100, an intermediate conveyance control unit 504 that performs operation control of the intermediate conveyance device 200, and a paper processing control unit that performs operation control of the paper processing apparatus 300. (Control unit) 505 and a side stitching processing control unit 506 that controls the operation of the side stitching processing apparatus 400.

The operation display unit 501 includes, for example, a touch panel type operation display device, various input switches, keys, and the like, and transmits a signal corresponding to a user input content to the central control unit 502.
A central control unit 502, an image formation control unit 503, an intermediate conveyance control unit 504, a paper processing control unit 505, and a side stitching processing control unit 506 are respectively a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only memory) and the like, and read and execute software programs and various data according to the processing contents.

The central control unit 502 sets various conditions related to the image forming system 1 according to the input contents of the user input via the operation display unit 501.
The setting conditions include, for example, the paper size, the number of colors at the time of image formation (for example, color, grayscale, monochrome, etc.) and the printing rate, the number of sheets of paper for which half-folding or saddle stitching processing is performed, the type It includes paper conditions such as size, basis weight, folding strength in the middle folding process, the number of binding needles that are driven into the crease portion of the paper in the saddle stitching process, and the position (binding position) at which the binding needle is driven in the saddle stitching process. .
The central control unit 502 performs processing corresponding to the setting contents on the control units of the image formation control unit 503, the intermediate conveyance control unit 504, the paper processing control unit 505, and the side stitching processing control unit 506. Output instructions. Each control unit controls the operation of the device to be controlled according to the command.

For example, the central control unit 502 outputs a command for performing saddle stitching processing or the like to the paper processing control unit 505.
In response to this, the sheet processing control unit 505 controls the saddle stitching unit 320 to perform saddle stitching processing and the like.
At this time, the sheet processing control unit 505 controls the transport unit 330 according to the sheet condition of the sheet to be saddle stitched, and sets the moving rod 332 to the “first position” or the “second position”. The sheet pushed out from 321 is supported by the moving rod 332.

Hereinafter, the operation of the moving rod 332 will be described in detail.
FIG. 5 is a flowchart showing the setting process of the operation of the moving rod 332.
Such setting processing is performed before the start of actual saddle stitching processing by the saddle stitching unit 320.

  First, in response to a user operation on the operation display unit 501, the sheet processing control unit 505 determines the sheet conditions (size, basis weight, number of sheets constituting the saddle-stitched booklet, the number of binding needles driven into the crease part, A position for binding the binding needle (binding position) is set (step S1).

  Next, the sheet processing control unit 505 sets a counter (initial value: n = 0) (step S2).

Next, the sheet processing control unit 505 determines whether the set sheet size (that is, the saddle stitching process) is a predetermined value (for example, A3) or less (step S2).
If the set sheet size is equal to or smaller than the predetermined value (step S2: YES), the sheet processing control unit 505 proceeds to step S5 described later.
On the other hand, when the paper size is larger than the predetermined value (step S2: NO), the paper processing control unit 505 sets the counter value to +1 (step S4) and proceeds to step S5 described later.

Next, the sheet processing control unit 505 determines whether or not the set number of sheets is equal to or greater than a predetermined number (for example, 10 sheets) (step S5).
If the set number of sheets is equal to or greater than the predetermined number (step S5: YES), the sheet processing control unit 505 proceeds to step S7 described later.
On the other hand, when the set number of sheets is less than the predetermined number (step S5: NO), the sheet processing control unit 505 sets the counter value to +1 (step S6), and proceeds to step S7 described later.

Next, the sheet processing control unit 505 determines whether or not the set basis weight of the sheet is a predetermined value (for example, 90 g) or more (step S7).
If the set basis weight of the sheet is equal to or greater than the predetermined value (step S7: YES), the sheet processing control unit 505 proceeds to step S9 described later.
On the other hand, if the set basis weight of the sheet is less than the predetermined value (step S7: NO), the sheet processing control unit 505 sets the counter value to +1 (step S8), and proceeds to step S9 described later.

Next, the sheet processing control unit 505 determines whether there are two or more set binding positions (step S9).
If there are two or more set binding positions (step S9: YES), the sheet processing control unit 505 proceeds to step S11 described later.
On the other hand, when the set binding position is one (step S9: NO), the sheet processing control unit 505 sets the counter value to +1 (step S10), and proceeds to step S11 described later.

  Next, the sheet processing control unit 505 determines whether or not the counter value is “n = 0” (step S11).

  If the value of the counter is not “n = 0” (step S11: NO), the sheet processing control unit 505 sets the moving rod 332 to the “first position”, that is, at one point of the moving rod 332. It is determined to support only the front end portion in the transport direction of the paper extruded from the hooking portion 321 (step S12).

  Next, the sheet processing control unit 505 selects a binding position where the stacking ratio of the moving rods 332 is equal to or greater than a predetermined value (for example, 1%), and is supported at one point in step S12 when binding processing is performed at the binding position. Thus, the movement timing of the moving rod 332 is determined (step S13).

  Next, the sheet processing control unit 505 determines whether or not the counter value is “n = 3” or more (step S14).

  If the value of the counter is less than “n = 3” (step S14: NO), the sheet processing control unit 505 sets the separation distance of the moving rod 332 from the hooking unit 321 to a default value (for example, conveyance of the sheet). The position of the moving rod 332 supporting the sheet at a position 30 mm from the front end portion in the direction) (step S15), and the process is terminated.

  On the other hand, when the value of the counter is “n = 3” or more (step S14: YES), the sheet processing control unit 505 sets the separation distance of the moving rod 332 from the hooking unit 321 to be larger than the default value (for example, the sheet) (Position where the moving rod 332 supports the paper at a position 10 mm from the front end in the transport direction) (step S16), and this processing is terminated.

  If the counter value is “n = 0” in step S11 (step S11: YES), the sheet processing control unit 505 sets the moving rod 332 to the “second position”, that is, the moving rod. It is determined that the entire sheet 332 pushed out from the hooking unit 321 is supported (step S17), and the process is terminated.

  Note that after the setting process, the sheet processing control unit 505 starts the creation of the saddle stitch booklet.

  Here, FIG. 6 is an example showing a state in which the moving rod 332 is in the “first position” in step S12 and only the front end portion in the conveyance direction of the paper pushed out from the hooking portion 321 is supported. 7 is a schematic view of the state of the sheet of FIG. 6 as viewed from above. 6 and 7 show a case where the distance from the hooking portion 321 of the moving rod 332 in step S15 is the default value.

For example, when the paper size is larger than a predetermined value, when the weight of the paper (paper bundle) is lighter than the predetermined value, or when the distance pushed out from the hooking portion 321 is large due to the paper size, binding position, or the like. When the sheet posture is unstable and the positions of the ridge lines of the hooking portion 321 and the moving rod 332 are shifted, the sheet placed from the hooking portion 321 to the moving rod 332 is likely to be inclined.
This setting process is control in consideration of such a problem, and when it is determined that the sheet condition is likely to cause the sheet inclination according to the determination in step S3, step S5, step S7, and step S9. As shown in FIG. 6, only one front end in the transport direction of the sheet pushed out from the hooking portion 321 is supported at one point of the moving rod 332.

  As a result, as shown in FIG. 7, the ridge line of the hooking portion 321 and the ridgeline of the moving hook 332 are in a line-to-point relationship, and the contact area of the paper extruded from the hooking portion 321 with the moving hook 332 With less, it is possible to suppress the sheet from tilting. Therefore, the binding needle can be driven into the binding position without shifting.

FIG. 8 is a schematic view of the state in which the distance from the hooking portion 321 of the moving rod 332 is larger than the default value in step S16, as viewed from above.
The higher the value of the counter counted in the determinations of step S3, step S5, step S7, and step S9, the more the position of the ridgeline between the hooking portion 321 and the moving rod 332 is shifted. It is considered that there are many paper conditions in which the paper placed from the hanging portion 321 to the moving rod 332 is likely to be inclined.
Step S14 is a control that takes this point into consideration. If it is determined in step S14 that there are many sheet conditions where the sheet is likely to be inclined, the distance that the moving rod 332 separates from the hooking portion 321. Change (greater than the default value).

  As a result, as shown in FIG. 8, when there are many paper conditions where the inclination of the paper is likely to occur, the contact area between the paper pushed out from the hooking portion 321 and the movable hook 332 becomes smaller, so that the paper Inclination can be more reliably suppressed.

  FIG. 9 is an example showing a state in which the moving rod 332 is in the “second position” in step S17 and the entire sheet pushed out from the hooking portion 321 is supported. FIG. It is the schematic diagram which looked at the state of this paper from the upper side.

For example, when the paper size is equal to or smaller than a predetermined value, when the weight of the paper (paper bundle) is equal to or larger than the predetermined value, or when the distance pushed out from the hooking portion 321 is small, the paper posture is stable. Even if the positions of the ridge lines of the hanging portion 321 and the moving hook 332 are deviated, the sheet placed from the hooking portion 321 to the moving hook 332 is not easily inclined.
For this reason, when it is determined by the determination in step S3, step S5, step S7, and step S9 that the sheet condition hardly causes the sheet inclination, as shown in FIG. The whole sheet pushed out from the hooking portion 321 is supported as a whole.

  Even in this case, as shown in FIG. 10, the inclination of the sheet does not occur regardless of the contact area between the sheet pushed out from the hooking portion 321 and the moving rod 332.

As described above, according to the present embodiment, the hooked portion 321 for hooking the mountain-shaped paper with the crease portion formed thereon and supporting it from below, and the paper supported by the hooking portion 321 are supported. The needle driving unit 325 for driving the binding needle, the sheet feeding direction rear end supported by the hooking unit 321 in the direction of the crease, the pushing unit 322 for pushing out the paper from the hooking unit 321, and the pushing unit 322 A movable hook 332 that supports the paper pushed out from the hooking portion 321 from below, and the moving hook 332 is a front end in the transport direction of the paper pushed out from the hooking portion 321 when the binding needle 325 drives the binding needle. Only support.
For this reason, the sheet can be prevented from being inclined by reducing the contact area between the sheet pushed out from the hooking portion 321 and the movable rod 332. Therefore, it is possible to suppress the binding position deviation of the paper.

Further, according to the present embodiment, when the stapler 325 strikes the binding needle with the stapler 325, only the front end in the transport direction of the sheet pushed out from the hooking unit 321 is set according to the preset sheet condition. Either the support or the entire support of the extruded paper is performed.
For this reason, the contact area between the sheet pushed out from the hooking portion 321 and the movable rod 332 can be reduced only when necessary according to the sheet condition.

Further, according to the present embodiment, when the binding needle is driven by the driving unit 331a for moving the moving rod 332 along the direction of the crease portion and the needle hitting unit 325, the driving unit 331a is controlled so that the moving rod 332 is moved. A sheet processing control unit 505 that moves in a direction away from the hanging unit 321 and supports only the front end portion in the conveyance direction of the sheet pushed out from the hooking unit 321.
For this reason, it is only necessary to control the movement of the moving rod 332, and the contact area between the sheet pushed out from the hooking portion 321 and the moving rod 332 can be changed with a simple configuration.

Further, according to the present embodiment, when the sheet processing control unit 505 supports only the front end portion in the transport direction of the sheet pushed out from the hooking unit 321 by the moving rod 332, according to the preset sheet condition, The distance that the moving rod 332 is separated from the hooking portion 321 is changed.
For this reason, more appropriate control can be executed in accordance with the paper, and the inclination of the paper, and consequently the binding position deviation of the paper can be more reliably suppressed.

Further, according to the present embodiment, the sheet condition includes a sheet ratio, a sheet size, and a sheet weight (the number of sheets and basis weight).
For this reason, more appropriate control can be executed in accordance with the ratio of the sheet, the size of the sheet, and the weight of the sheet.

  In the above-described embodiment, the configuration in which the position of the moving rod 332 is set to the “first position” or the “second position” according to the paper conditions has been described as an example. The configuration may be such that the “first position” is controlled.

In the above embodiment, the paper size, the number of sheets, the basis weight of the paper, and the number of binding positions are exemplified as the paper conditions. However, in addition to those exemplified in the above embodiment, Alternatively, the configuration may be such that the ratio of the paper supported by the hooking portion 321 and the moving rod 332, the height of the ridgeline of the hooking portion 321 and the moving rod 332, and the like are determined.
In this case, when the ratio of the sheet supported by the movable hook 332 is greater than the ratio of the sheet supported by the hooking portion 321, the movable hook 332 is set to the “first position”.
Further, when the height of the ridge line of the movable hook 332 is higher than the height of the ridge line of the hook section 321 serving as a reference, the height of the ridge line of the hook section 321 is set to “first”. Position.
Further, any configuration that determines at least one of these paper conditions may be used.

Further, in the above-described embodiment, the configuration in which the moving rod 332 moves to the left and becomes the “first position” has been described as an example. However, the sheet to which the moving rod 332 is pushed out from the hooking portion 321 is only one point. If it is the structure which can be supported, the moving rod 332 does not need to move to the left direction.
For example, the ridgeline of the moving rod 332 may be lowered by leaving only a part on the downstream side in the transport direction, thereby supporting the paper at only one point. Alternatively, the sheet may be supported at only one point by tilting the ridgeline of the movable rod 332 so that the downstream side in the transport direction is upward and the upstream side in the transport direction is downward.

DESCRIPTION OF SYMBOLS 1 Image forming system 100 Image forming apparatus 320 Saddle stitching part 321 A hook part (1st support part)
322 Extruding unit 323 Transfer unit 324 Abutting unit 325 Needle hitting unit 326 Needle receiving unit 330 Transfer unit U Moving unit 331 Base unit 331a Driving unit 332 Moving rod 502 Central control unit 503 Image formation control unit 505 Paper processing control unit (control unit)

Claims (6)

A first support part for hooking and supporting the sheet in a chevron state in which a fold part is formed;
A stapling portion for driving a binding needle to the paper supported by the first support portion;
An extruding unit that pushes the rear end of the paper supported by the first support unit in the direction of the crease and pushes the paper out of the first support;
A second support part that supports the paper extruded from the first support part by the push part from below,
The paper processing apparatus, wherein the second support portion supports only a front end portion in the transport direction of the paper pushed out from the first support portion when the binding needle is driven by the needle hitting portion.   The second support portion supports only the front end portion in the transport direction of the paper pushed out from the first support portion or is pushed out according to a preset paper condition when the binding needle is driven by the needle hitting portion. The sheet processing apparatus according to claim 1, wherein the sheet processing apparatus performs any one of support of the entire sheet. A drive unit that moves the second support unit along the direction of the crease unit;
When the binding needle is driven by the needle driving unit, the driving unit is controlled to move the second support unit in a direction away from the first support unit, and the conveyance direction of the paper extruded from the first support unit The sheet processing apparatus according to claim 1, further comprising a control unit that supports only the front end.   In the case where the control unit causes the second support unit to support only the front end portion in the transport direction of the sheet pushed out from the first support unit, the second support unit is configured so that the second support unit corresponds to the preset sheet condition. The sheet processing apparatus according to claim 3, wherein a distance away from the one support portion is changed.   The sheet condition includes at least one of a ratio of sheets supported by the first support unit and the second support unit, a sheet size, a sheet weight, and the number of binding positions with respect to the sheet. The sheet processing apparatus according to claim 2 or 4. An image forming apparatus for forming an image on paper;
A sheet processing apparatus according to any one of claims 1 to 5, which performs predetermined sheet processing on a sheet connected to the image forming apparatus and on which an image is formed by the image forming apparatus.
An image forming system comprising:

Images