JP4914061B2 - Sheet processing apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet processing apparatus that performs predetermined processing such as alignment and binding on a sheet member that is carried in (refers to all sheet-like recording media such as recording paper, transfer paper, and OHP sheets), and the sheet processing. The present invention relates to an image forming apparatus including the apparatus.

  As this type of technology, for example, the inventions described in Patent Documents 1 and 2 are known. Among these, in Patent Document 1, a stitcher portion provided with a staple needle housing portion and a push-out portion and a clincher portion that bends the tip of the needle are configured separately, and a plurality of existing stapler members are provided between the two stapler members. First and second moving pedestals for translating the stitcher unit and the clincher unit in synchronization with a direction orthogonal to the sheet conveying direction, respectively, in a sheet processing apparatus for binding sheets with a staple needle. First driving means for driving the first and second movable pedestals, and first and second rotating pedestals supported coaxially and rotatably with respect to the first and second movable pedestals, respectively. And second driving means for synchronously rotating the first and second rotating pedestals, and the amount of movement of the moving pedestal and the rotating pedestal by the first driving means and the second driving means. Control means for performing parallel binding or diagonal binding at a desired position based on a difference in moving speed, and the control means performs parallel binding or diagonal binding and then shifts to the next binding operation. The stitcher unit and the clincher unit are moved closer to the binding position than the home positions of the stitcher unit and the clincher unit, and are moved to a predetermined position that does not hinder the loading of the paper, and are always moved in one direction from the position to the binding position. An invention for performing a binding operation is disclosed.

  Japanese Patent Application Laid-Open No. 2004-259542 discloses a sheet post-processing apparatus in which an image-formed sheet conveyed from an image forming apparatus is stapled and then discharged to a discharge tray by a discharge unit. A pair of staplers for stapling a sheet is configured to be able to drive translation and rotation by a single drive source. For various small size sheets, the stapler is translated in the width direction perpendicular to the sheet conveyance direction. An invention is disclosed in which stapling is performed, and stapling is performed by parallel movement and rotation of a stapler on various large size sheets.

As other related inventions, the inventions described in Patent Documents 3 to 6 are also known.
JP 2004-42326 A JP-A-11-180628 JP 09-136760 A JP 09-208116 A Japanese Patent Laid-Open No. 10-152259 JP-A-10-194575

  As described above, Patent Document 1 discloses an invention in which movement and rotation in the paper width direction are performed by separate drive sources. When there are two binding modes of so-called parallel binding that strikes the needle parallel to the end of the sheet member in the binding mode of the sheet member and oblique binding that strikes the needle diagonally, a stapler provided for each is provided. The binding mode is executed by individually driving the drive device for parallel movement and the drive device for rotating obliquely. If the two drive devices (drive sources) are dedicated to each other in this way, the number of parts naturally increases, and accordingly, the cost increases and the mechanical mass also increases.

  In addition, as in the invention described in Patent Document 2, there is one drive source, but if two staplers move along the rail and rotate using a cam mechanism, Patent Document 1 describes. Compared to the invention, the cost reduction effect can be obtained by using one drive source, but the movement range is limited and the binding position is limited. In addition, binding cannot be performed at the center of the sheet, and the user's needs may not be met.

  The present invention has been made in view of the actual situation of the prior art, and its purpose is to have a single drive source, a simple structure, and a wide selection range of binding positions. It is to be able to meet various needs.

In order to achieve the object, the first means includes a binding means for binding the sheet member that has been carried in, a means for moving the binding means in a direction orthogonal to the conveying direction of the sheet member, and the movement. In a sheet processing apparatus having one drive source for driving the means , the contact member provided on the binding means , the first protrusion provided at the first position, and the second position are provided. and a second protrusion, was, said means for moving is a process of moving said stapling means to rotate the part is in contact with the binding means of said first of said abutment member with the projection By setting the posture of oblique binding by this, by setting a part of the abutting member in contact with the second protrusion and rotating the binding means, the posture of the diagonal binding is set to the posture of parallel binding, The binding means is at the first position. Holding the posture when it is set to the posture of the oblique stapling, between the first position and the second position abutting member of the first projection and the second projection and a non-contact state It is characterized by moving.
In this case, the binding means can perform at least one parallel binding at the center in the width direction of the sheet member. Further, the binding means can set a position that does not participate in the binding operation to the sheet member as a standby position, and that position can be a binding member replenishment position of the binding means. The standby position is set, for example, further on the front side of the front plate of the apparatus main body.
The binding means includes means for maintaining the state when the sheet member is in a parallel binding state or an oblique binding state. The means for maintaining includes, for example, an engaging portion that engages between a base of the binding means and a rotating member that rotates a support member that supports the binding portion of the binding means. The engaging portion preferably has elasticity, and the oblique binding state is, for example, a state inclined by 45 ° with respect to an end portion in the conveying direction of the sheet member. Further, it is preferable that the distance from the end of the sheet member in the parallel binding to the binding member is equal to the distance from the end of the diagonal binding.
The second means is characterized in that the image forming apparatus includes the sheet processing apparatus according to the first means.

In the embodiment described later, the sheet processing apparatus is denoted by reference numeral 2, the binding means is denoted by the stapler 8,
The drive source is the motor 23 with pulley, and the moving means are the guide rod 15 and the timing belt 2
1. The rotating member is the sector gear 16, the gear 17, the lever 18, the pin A24 and the pin B25, the first protrusion is the pin A24, the second protrusion is the pin B25, and the front plate is maintained at the reference numeral 2a. The means for causing this corresponds to the pedestal 16, the engaging hook 51 and the engaging holes 52a, 52b, and 52c, and the image forming apparatus corresponds to reference numeral 1.

According to the present invention, since the configuration is provided in which the binding means moves to the binding position while maintaining the rotated state, the diagonal binding processing can be performed at an appropriate position regardless of the size of the sheet member. As a result, it is possible to correspond to various use needs improvements and user of the product. Further, when performing parallel binding or oblique binding, the staple can be moved with a single drive source in any binding mode, and an increase in the number of parts can be suppressed.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram showing a system configuration of an image forming apparatus according to a first embodiment of the present invention. This system includes an image forming apparatus 1 main body and a sheet processing apparatus 2. The sheet processing apparatus 2 is attached to the side surface of the main body of the image forming apparatus 1, and a sheet member on which an image has been formed is carried into the sheet processing apparatus 2 from a paper discharge port on the side surface of the main body of the image forming apparatus 1 and subjected to predetermined processing. .

  FIG. 2 is a diagram illustrating details of the sheet processing apparatus 2. 2A, the sheet processing apparatus 2 includes an entrance roller 3, a paper discharge tray 4, a return roller 5, a jogger 6, a rear end fence 7, a stapler 8, and a discharge link 9. A sheet member (hereinafter simply referred to as “sheet member”) discharged from the image forming apparatus 1 is carried into the sheet processing apparatus 2 and then onto a sheet member stacking section of a discharge tray 4 or a jogger 6 described later. Discharged.

  The return roller 5 is provided to face the sheet member mounting surface of the paper discharge tray 4 and includes a roller 5a that conveys the sheet member and an arm 5b that supports the roller 5a. The arm 5b can be rotated by a rotation center 5c. It is supported by. As shown in FIG. 2B, the jogger 6 includes a vertical portion 6V that acts on the end surface of the sheet member and a stacking portion 6H on which the sheet member is stacked. Further, a front jogger 6a that aligns the front side of the sheet member and a rear jogger 6b that aligns the rear side of the sheet member are provided in pairs.

  The rear end fence 7 is for aligning the end portion (rear end portion Send) in the sheet member discharge direction. The sheet member discharged onto the discharge tray 4 or the jogger 6 is returned to the discharge direction by the return roller 5. Is transported to the opposite side, and its end Send hits against the rear end fence 7 and the aligning operation is performed. The stapler 8 is installed in the vicinity of the rear end fence 7 and performs a binding process on the vicinity of the end Send of the sheet member aligned with the rear end fence 7. In FIG. 2B, only the portion of the rear end fence 7 with which the sheet member abuts is shown. The discharge link 9 is loaded on the paper discharge tray 4 and the jogger 6, has a function of moving the sheet member abutted against the rear end fence 7 onto the paper discharge tray 4, and operates by a link mechanism (not shown).

  3A and 3B are diagrams showing the attachment state and the moving mechanism of the stapler 8, FIG. 3A is a plan view in which the stapler 8 is omitted, and FIG. 3B is a view in the direction of arrow A in FIG. 8 is shown. In the figure, a pair of guide rods 15 are installed in parallel between the front plate 2a and the rear plate 2b of the sheet processing apparatus 2, and are assembled to the front plate 2a and the rear plate 2b. A pedestal 16 is slidably mounted on the guide rod 15. Shafts 17a and 19a are erected on the pedestal 16, and a gear 17 and a sector gear 19 are rotatably attached to the shafts 17a and 19a with respect to the shaft. Further, as shown in FIG. 3B, the stapler 8 is loaded on the sector gear 19, and the stapler 8 and the sector gear 19 rotate integrally. In addition, the sector gear 19 meshes with the gear 17, and in the range where the sector gear 19 meshes with the gear 17, both of them rotate together. Two levers 18 are provided on the gear 17 so as to protrude from the outer peripheral portion of the gear 17. The stapler unit 20 is constituted by these members, and the stapler 8 itself rotates integrally with the rotation of the sector gear 19.

  A timing belt 21 is stretched between the pulley of the motor 23 with pulley and the pulley 22, and the pedestal 16 is fixed to the timing belt 21. Accordingly, the timing belt 21 rotates with the rotation of the pulley-equipped motor 23, and the pedestal 16 reciprocates along the guide rod 15 with the rotational movement. A pair of pins A24 and a pair of pins B25 projecting in the direction of the lever 18 are provided at positions corresponding to the movement locus of the lever 18 at positions symmetrical to the sheet conveyance center. In this embodiment, these pins A24 and B25 project from a bracket 2c fixed between the front plate 2a and the rear plate 2b.

  4 and 5 are operation explanatory views showing the operation of the stapler 8. FIG. FIG. 4 is a view showing an operation when the stapler 8 in the parallel binding posture is changed to the oblique binding posture, and FIG. 5 is an operation when the stapler 8 in the oblique binding posture is changed to the parallel binding posture. FIG. As shown in FIG. 4A, the stapler unit 20 moves in the direction of arrow B along the guide rod 15 by driving the motor 23 with pulley, and the lever 18 abuts on the pin A24, as shown in FIG. 4B. If the lever 18 further moves from the contact position, the lever 18 hits and rotates, and at the same time, the gear 17 rotates. Along with this, the sector gear 19 is also rotated to rotate the stapler 8 to be in an oblique state. After a predetermined amount of rotation, the linear movement of the stapler unit 20 stops and moves along the guide rod 15 in the reverse direction while maintaining this rotated state. And it stops at the predetermined | prescribed position which performs a binding process, and performs binding operation | movement. As a result, the diagonal strike is performed at an angle inclined by the rotation amount.

  When the stapler 8 changes from the oblique binding posture state to the parallel binding posture state, as shown in FIG. 5, the stapler unit 20 moves along the guide rod 15 by the operation of the pulley-equipped motor 23 as shown in FIG. 4. On the contrary, it moves in the direction of arrow C. At that time, the lever 18 hits the pin B25 and rotates, and the gear 17 rotates with this rotation. In response to this rotation, the sector gear 19 and the stapler 8 are rotated to be in a parallel binding state. At this time, the lever 18 passes through the pin B25, and the rotation of the stapler 8 is finished to be in a parallel state. In this state, it is stopped at a predetermined position where the binding process is performed, and parallel binding becomes possible. Accordingly, the protruding height of the pin A24 and the pin B25 and the length of the lever 18 are set to a length and a position at which the above operation can be performed. That is, the pin B25 does not contact the lever 18 in the parallel binding state but contacts in the diagonal binding state, and the pin A24 contacts the lever 18 in the parallel binding state to be in the diagonal binding state. The amount of protrusion.

  The relationship with the sheet member at this time is shown in FIG. As shown in the figure, two pairs of pins A24 and B25 are provided at positions (symmetrical positions) distributed with respect to the sheet conveyance center CR. Among these pins, the pin B25 is located closer to the sheet conveyance center CR than the position at which the sheet processing apparatus 2 strikes the minimum-size sheet member Smin that can be bound obliquely. Accordingly, the diagonal binding can be performed at an arbitrary position in a portion located between the pin A24 of the sheet member and the pin B25 adjacent to the pin A.

  7 to 11 are explanatory views showing the binding operation when the minimum-size sheet member Smin is bound. FIG. 7 shows a state in which the stapler unit 20 is inclined as described with reference to FIG. When the stapler unit 20 in the diagonally bound state moves from the near side to the far side (in the direction of arrow D) as shown in FIG. 8 from this state, the lever 18 hits the pin B25 and rotates as shown in FIG. Let As a result, the sector gear 19 rotates to rotate the stapler 8. Then, as shown in FIG. 10, when the stapler 8 returns to the parallel binding state, the lever 18 disengages the pin B5, and the stapler 8 maintains the parallel binding state. In this state, as shown in FIG. 11, the stapler unit 20 further advances straight or moves to a predetermined position where the binding process is performed in the reverse direction, and performs the binding process. Further, when performing parallel binding at a plurality of locations, the stapler unit 20 can move straight to a predetermined position in the state of FIG. 11, thereby moving to an arbitrary position of the sheet member S while maintaining the parallel binding state. The binding process can be performed.

  In consideration of the exchangeability of the staple needle of the stapler 8, it is user-like that the staple needle can be exchanged outside the side plate of the apparatus. For example, as shown in FIG. A24 is positioned on the front side of the front plate 2a, and the stapler 8 is rotated on the front side of the sheet processing apparatus 2, and the standby state is set at this position. If comprised in this way, the cartridge 20a which accommodated the binding needle | hook for replacement | exchange can be attached or detached, without interfering with a surrounding member. In addition, the stapler 8 is inclined before the front side plate 2a, and the staple needle replacement operation can be easily performed on the front side of the sheet processing apparatus 2.

<Second Embodiment>
In the first embodiment, the posture of the staple unit 20 for performing parallel binding and oblique binding is controlled by movement along the guide rod 15. By controlling in this way, parallel binding and oblique binding can be performed with a simple mechanism, but the posture of the staple unit 20 is held only by friction between the gear 17 and the sector gear 19 and friction around the shafts 17a and 19a. Has been. In this manner, the binding means moves in the horizontal plane and rotates, so that the posture can be maintained only by the frictional force. Therefore, although it is considered that the configuration as it is is sufficient for normal operation, the influence of vibration, reaction force at the time of binding, and the like may not be ignored depending on the use environment. Therefore, in the second embodiment, the posture of the staple unit 20 can be reliably maintained.

  13A and 13B are diagrams showing the structure of the staple unit 20 according to this embodiment. FIG. 13A is a plan view and FIG. 13B is a bottom view. In FIG. 13, the pedestal 16 is provided with three engagement holes 52a, 52b, and 52c (hereinafter simply indicated by reference numeral 52), and one of these engagement holes 52a, 52b, and 52c An engagement hook 51 that is elastically engaged is provided on the gear 17. There are three engagement holes: an engagement hole 52a for front diagonal binding, an engagement hole 52b for parallel binding, and an engagement hole 52c for back diagonal binding, and the engagement hook 51 is engaged with any one of them. As a result, the position of the stapler 8 is fixed to one.

  FIG. 14 shows the front oblique binding, and the engagement hook 51 engages with the front oblique binding engagement hole 52 a of the base 16. FIG. 15 shows the back diagonal binding, and the engagement hook 51 engages with the back diagonal binding engagement hole 52 c of the base 16. FIG. 16 shows parallel binding, and the hook 51 for engagement engages with the engagement hole 52b for parallel binding. FIG. 17 shows the relationship between the engaging hook 51 and the engaging holes 52a, 52b, and 52c during operation in which the lever 18 of the gear 17 abuts on the pin A24 or the pin B25 and changes its posture while the stapler 8 moves in parallel. FIG. The hook 51 for engagement is released from the engagement hole 52 and is warped, and slides and moves on the surface of the base 16 as the stapler 8, the gear 17, and the sector gear 19 rotate. After the movement, the posture of the stapler 8 is fixed by elastically engaging with another engagement hole 52, and the state is maintained.

  As shown in FIG. 18, the engagement holes 52a, 52b, and 52c have an engagement hole 52a with respect to a line LN connecting the shaft 17a and the shaft 19a when the oblique binding angle is set to 45 °. The engagement hole 52c is formed at a position inclined 45 ° (FIG. 18C) in the counterclockwise direction, and in the case of parallel binding, the engagement hole 52b is formed by the line LN. It is formed on the top (FIG. 18B). In other words, the front diagonal binding engagement hole 52a and the back diagonal binding engagement hole 52c are inclined by 45 ° with respect to the parallel binding engagement hole 52b. This angle is appropriately set according to the angle set for the diagonal binding, but generally an angle of 45 ° is selected.

  Other parts that are not particularly described are configured in the same manner as those of the first embodiment described above and function in the same manner, and thus redundant description is omitted.

<Binding position of staples for parallel binding and diagonal binding>
In the first and second embodiments described above, for example, when performing oblique binding at an angle of 45 ° and when performing parallel binding, the stapler binding position changes because the stapler 8 rotates about the shaft 19a. To do. Therefore, the binding position of the staple needle in the first and second embodiments will be described.

  FIG. 19 is an explanatory view showing the binding position by the binding needles of the diagonal binding and the parallel binding. Reference numeral 201 denotes a stapler unit 20 in a parallel binding state, and reference numeral 202 denotes a stapler unit 20 rotated by 45 ° for oblique binding. Originally, the sector gear 19 is also rotated by 45 °, but is omitted in order to simplify the drawing. Here, the distance between the staple driving position of the stapler 8 and the sector gear 19 is L, the width of the needle driven out by the stapler 8 is S (constant-a constant dimension according to the standard), and the rotation center of the sector gear 19 is o. To do. In the stapler unit 201 in the parallel binding state, a perpendicular line is drawn from the rotation center o of the sector gear 19 to the needle, and the intersection is defined as a. Similarly, in the stapler unit 202 in the diagonally bound state, a perpendicular line is drawn from the rotation center o of the sector gear 19 to the needle, and the intersection is b. In addition, the needle end portion (left end portion in the figure) at the needle binding position in the parallel binding state coincides with the needle end portion (right side in the drawing) in the diagonal binding state, and this is designated as c. .

The triangle oac and the triangle obc are congruent due to the side oa = side ob (= L), the side ac = side bc (= S / 2), and the equivalent of three sides common to OC. Therefore,
Angle aob = 45 °, angle coa = angle cob
Than,
Angle coa = angle cob = angle aob / 2 = 22.5 °
It is. Therefore,
tan22.5 ° = (S / 2) / L
Therefore,
L = (S / 2) /tan22.5°≈1.2S
It is.

  That is, by setting the rotation center o of the sector gear 19 at a position 1.2 times the distance from the needle having the length S, the position of the needle end portion at the time of parallel binding and oblique binding is almost the same. The distance from the sheet member rear end Send is substantially the same between the parallel binding and the diagonal binding. Thereby, high binding quality can be obtained. In the case of parallel binding, binding processing can be performed at an arbitrary position in the width direction of the paper, and the number of binding locations is not limited.

As described above, according to the present embodiment, the following effects can be obtained.
1) When performing parallel binding or oblique binding on a sheet member, the staple can be moved with a single drive source in any binding mode, and an increase in the number of parts is suppressed. Thus, an increase in cost and weight can be prevented.

2) It is possible to deal with both parallel binding and diagonal binding processing with a single stapler at the end of the sheet member, and it is easy to cope with the variety of user work.

3) Since the two types of binding processes can be performed regardless of the size of the sheet member, it is possible to improve the function of the product and meet various usage needs of the user.

4) Since it is possible to perform book binding such as two-point binding with a single stapler, the functions are further enhanced and the user's various usage needs can be met.

5) The user can easily supply the staples to the stapler and workability is improved. In addition, there is no concern about machine damage or user injury.

6) It becomes possible to fix the staples with the postures of parallel binding and oblique binding, aiming at the binding needle without changing the position and posture of the stapler due to the vibration of the machine or the vibration of the stapler itself (purpose) ).

7) Since the stapler can be reliably set at a 45 ° position for oblique binding, it is possible to cope with 45 ° oblique binding, which is frequently used by many users.

8) At the time of oblique binding, it is possible to hit the binding needle at an appropriate position of the sheet member, and it is possible to prevent the binding portion from being broken and being separated during use of the sheet member.

9) Since the binding needle can be hit even at the time of diagonal binding at a position equivalent to the position of the distance from the end face set at the time of parallel binding, the binding needle is prevented from covering the printing surface of the sheet member. be able to. As a result, usability can be improved.

1 is a diagram illustrating a system configuration of an image forming apparatus according to a first embodiment of the present invention. It is a figure which shows the detail of a sheet processing apparatus. FIG. 3 is a diagram illustrating a stapled state and a moving mechanism of the sheet processing apparatus illustrated in FIG. 2. FIG. 4 is an operation explanatory diagram illustrating the operation of the stapler illustrated in FIG. 3, illustrating a state when the stapler is in an oblique binding state. FIG. 4 is an operation explanatory diagram illustrating the operation of the stapler illustrated in FIG. 3, illustrating a state when the stapler returns from the oblique binding state. FIG. 5 is a diagram illustrating a relationship between a stapler unit and a plurality of pins A and B provided at positions distributed with respect to the sheet conveyance center. It is a figure which shows the stapler unit in the state of diagonal binding. It is a figure which shows the position which a stapler moves from the position of FIG. 7, and can bind diagonally to the corner | angular part of the sheet member of the minimum size. It is a figure which shows operation | movement when a stapler moves further from the position of FIG. 8, and transfers to the state of parallel binding from the state of diagonal binding. FIG. 10 is a diagram illustrating an operation when the stapler further moves from the position of FIG. 9 to move to the parallel binding state and then moves further. It is a figure which shows the state when moving from the state of FIG. 10 to the position of parallel binding, and performing parallel binding. It is a figure which shows the example which operates a staple unit diagonally in the front side of a front side board in order to make it easy to replace a binding needle. It is a figure which shows the structure of the stapler unit which concerns on the 2nd Embodiment of this invention. It is a figure which shows the relationship between a gear and an engagement hook when performing front side diagonal binding by the stapler unit of FIG. It is a figure which shows the relationship between a gear and an engagement hook when performing back diagonal binding by the stapler unit of FIG. It is a figure which shows the relationship between a gear and an engagement hook when performing parallel binding by the stapler unit of FIG. It is a figure which shows the relationship between the engaging hook and the engaging hole in operation | movement which the lever of a gear contact | abuts to the pin A or the pin B and changes the attitude | position while the stapler moves in parallel. It is a figure which shows the relationship between the angle of a stapler of diagonal binding and parallel binding, an engagement hook, and an engagement hole. It is explanatory drawing which shows the binding position by the binding needle | hook of diagonal binding and parallel binding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Sheet processing apparatus 3 Inlet roller 4 Discharge tray 5 Return roller 6 Jogger 7 Rear end fence 8 Stapler 9 Release link 15 Guide rod 16 Base 17 Gear 17a Shaft 18 Lever 19 Sector gear 19a Shaft 20 Stapler unit 21 Timing Belt 22 Pulley 23 Motor with pulley 24 Pin A
25 pin B
S sheet member Send sheet edge (rear edge)

Claims (10)

A sheet comprising binding means for binding the sheet member that has been carried in, means for moving the binding means in a direction orthogonal to the conveying direction of the sheet member, and one drive source for driving the means for moving In the processing device,
A contact member provided in the binding means;
A first protrusion provided at a first position;
A second protrusion provided at a second position;
Have
The means for moving is a process of moving the binding means,
By setting a part of the abutting member in contact with the first protrusion and rotating the binding means, an oblique binding posture is set,
By setting a part of the contact member in contact with the second protrusion and rotating the binding means, the posture of the oblique binding is set to the posture of parallel binding,
The binding means retains the posture when the oblique binding posture is set at the first position, and the first contact member is in contact with the first protrusion and the second protrusion . And a second position. A sheet processing apparatus, wherein
The sheet processing apparatus according to claim 1 , wherein the binding unit performs parallel binding at least one place on a central portion in a width direction of the sheet member . 3. The sheet processing apparatus according to claim 1 , wherein the binding unit sets a position that does not participate in the binding operation to the sheet member as a standby position, and the position is a binding member replenishment position of the binding unit. . The sheet processing apparatus according to claim 3, wherein the standby position is further on the front side of the front side plate of the apparatus main body . The said binding means is provided with the means to maintain the said state, when it will be in the state of a parallel binding or the diagonal binding with respect to the said sheet | seat member. The sheet processing apparatus according to 1. The said maintaining means consists of an engaging part engaged between the base of the said binding means, and the rotation member which rotates the support member which supports the binding part of the said binding means. Sheet processing equipment. The sheet processing apparatus according to claim 6, wherein the engaging portion has elasticity . The sheet processing apparatus according to any one of claims 1 to 6, characterized in that the state of the oblique stapling is 45 ° tilted relative to the end of the conveying direction of the sheet member. The distance from the conveyance direction edge part of the sheet | seat member in the said parallel binding to the binding member, and the distance from the said edge part in the said diagonal binding are equivalent, The any one of Claim 1 thru | or 8 characterized by the above-mentioned. Sheet processing equipment. An image forming apparatus comprising the sheet processing apparatus according to claim 1 .

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