JP2010058916A - Sheet postprocessing device and image forming system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet postprocessing device and an image forming system having the same, for attaining folding without having a complicated mechanism, without enlarging the device, without largely changing a device constitution status quo. <P>SOLUTION: This sheet postprocessing device has a folding processing mechanism having a folding plate 74 arranged so as to be capable of advancing-retreating in the substantially vertical direction to the paper carrying direction, and a pair of unabutting reciprocal folding roller pairs 81 arranged in its advancing direction and folding a sheet or a sheet bundle pushed in a nip by the folding plate 74. The respective folding rollers 81a and 81b for forming the folding roller pairs 81 are independently driven. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sheet processing apparatus that includes a sheet folding device that folds a sheet (sheet-shaped recording medium--for example, a sheet) and performs saddle stitch binding, and an image forming system including the sheet processing apparatus.

A paper processing device called “Finisher” is known as a device that collates a plurality of image-recorded sheets discharged from an image forming apparatus for each number of copies and binds them by staple. One of them has a function of performing saddle stitch binding.
In a sheet processing apparatus having this function, a binding portion of a sheet bundle bound at the center as a folding means for saddle stitching is pushed out in a substantially vertical direction by a folding blade (extruding member), and a pair of folding rollers provided in the moving direction. The paper bundle is creased and the sheet bundle is half-folded.

Such a sheet processing apparatus is disclosed in Patent Document 1.
JP 2006-001736 A Japanese Patent No. 3915439 JP 2006-290616 A

  However, according to the conventional technology, the paper friction coefficient differs between the upper and lower surfaces of the folded paper bundle depending on the printing state at the time of the middle folding, and the problem that the paper cannot be successfully transferred to the paper discharge roller during conveyance after folding, Since the mechanism simply passes the crease (fold vertices) and simply creases, the larger the number of sheets, the larger the number of sheets, the larger the bundle of sheets, and the lower the storage, stackability, appearance quality, etc. There was a problem.

  It is hoped that a mechanism that can simultaneously achieve the purpose of preventing the deterioration of transport quality due to subtle variations in the roller diameter of the pair of folding rollers and the purpose of improving the finished quality and stacking quality by suppressing the bulge of the folded paper bundle will be desired. It is rare. In order to prevent the bulge after folding, it is necessary to further crease both corners of the folding vertex.

  Patent Documents 2 and 3 disclose such a sheet processing apparatus. However, the layout in the apparatus is greatly different from that of the current apparatus, and the apparatus is also increased in size.

  SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and a sheet processing post-processing apparatus that realizes folding without significantly changing the current apparatus configuration, without increasing the size of the apparatus, and without having a complicated mechanism, and the same An object of the present invention is to provide an image forming system including

  In order to achieve the above object, according to a first aspect of the present invention, there is provided, as a first aspect, an ejecting means installed so as to be able to advance and retreat in a direction substantially perpendicular to the paper conveyance direction, and a projecting means disposed in the advancing direction. Each of the folding rollers for forming the folding roller pair, comprising a folding processing mechanism having a pair of non-abutting forward and reverse folding rollers that fold the sheet or sheet bundle pushed into the sheet Is a sheet post-processing apparatus that is driven independently.

  In order to achieve the above object, the present invention provides, as a second aspect, an image forming system comprising the sheet post-processing apparatus according to the first aspect of the present invention and an image forming apparatus. It is to provide.

  According to the present invention, there is provided a post-sheet processing apparatus that realizes folding without significantly changing the current apparatus configuration, without increasing the size of the apparatus, and without having a complicated mechanism, and an image forming system including the same. it can.

<Overall configuration>
FIG. 1 shows a configuration of an image forming system including a sheet post-processing apparatus and an image forming apparatus that preferably implements the present invention. Here, the entire sheet post-processing apparatus and a part of the image forming apparatus are shown.

  In FIG. 1, the sheet post-processing apparatus PD is attached to the side of the image forming apparatus PR, and the recording medium (sheet in this case) discharged from the image forming apparatus PR is guided to the sheet post-processing apparatus PD. The paper passes through a conveyance path A having post-processing means (in this embodiment, punch unit 100 as a punching means) for performing post-processing on a single sheet, and then to a conveyance path B that leads to the upper tray 201 and to the shift tray 202. The paper is distributed by branch claws 15 and 16 to a conveyance path C that leads to a conveyance path C that leads to a processing tray F that performs alignment, stapling, and the like (hereinafter also referred to as a staple processing tray).

  The sheet guided to the staple processing tray F through the transport paths A and D and subjected to alignment, stapling, and the like in the staple processing tray F is transferred to the shift tray 202 by the branch guide plate 54 and the movable guide 55 which are deflecting means. It is configured to be distributed to a conveying path C to be guided and a processing tray G to be folded (hereinafter also referred to as a middle folding processing tray), and a sheet subjected to folding or the like in the middle folding processing tray G passes through the conveying path H. Guided to tray 203.

  Further, a branching claw 17 is disposed in the conveyance path D and is held in the state shown in the figure by a low load spring (not shown). After the trailing edge of the sheet passes through this, the conveyance rollers 9, 10 and staple discharge At least the transport roller 9 of the rollers 11 is reversed, and the rear end of the paper is guided to the paper storage portion E by the prestack roller 8 and stays there. By repeating this operation, two or more sheets can be transported in a stacked manner.

  In the conveyance path A common to each upstream of the conveyance paths B, C, and D, an inlet sensor 301 that detects a sheet received from the image forming apparatus, an inlet roller 1, a punch unit 100, a punch slag hopper 101 downstream thereof, The conveyance roller 2 and the branch claws 15 and 16 are sequentially arranged. The branch claws 15 and 16 are held in the state shown in FIG. 1 by a spring (not shown), and when the solenoid (not shown) is turned ON, the branch claw 15 rotates upward and the branch claw 16 rotates downward. The paper is distributed to the transport paths B, C, and D.

  When the sheet is guided to the conveyance path B, the branching claw 15 is in the state shown in FIG. 1 and the solenoid is OFF. When the sheet is guided to the conveyance path C, the solenoid is turned on from the state shown in FIG. 1 to turn the branch claw 15 upward and the branch claw 16 downward. When the sheet is guided to the conveyance path D, the branching claw 16 is in the state shown in FIG. 1 and the solenoid is turned off, and the branching claw 15 is turned upward by turning on the solenoid from the state shown in FIG.

<Paper bundle alignment operation for folding in half>
2 and 3, the sheets guided to the staple discharge tray F by the staple discharge roller 11 are sequentially stacked on the staple processing tray F. In this case, alignment in the vertical direction (paper conveyance direction) is performed by the tapping roller 12 for each sheet, and alignment in the horizontal direction (direction perpendicular to the sheet conveyance direction-paper width direction) is performed by the jogger fence 53.

  In the saddle stitching stapler S2, as shown in FIGS. 1 and 2, the distance from the rear end fence 51 to the needle striking position of the saddle stitching stapler S2 corresponds to half the conveyance direction length of the maximum sheet size that can be saddle stitched. Two are arranged so as to be more than the distance, and two are arranged symmetrically with respect to the alignment center in the paper width direction, and are fixed to the stay 63. Since the saddle stitching stapler S2 itself is a known configuration, a detailed description is omitted here. However, when performing saddle stitching, the jogger fence 53 aligns the direction orthogonal to the sheet transport direction, and the trailing edge fence 51 and the tapping roller are aligned. 5, after the sheet conveyance direction is aligned, the discharge belt 52 is driven and the trailing end of the sheet bundle is lifted by the discharge claws 52 a and 52 a ′, and the center of the sheet bundle conveyance direction is moved to the binding position of the saddle stitching stapler S 2. The part is positioned and stopped at this position to execute the binding operation. Then, the bound sheet bundle is conveyed to the middle folding process tray G side through the branch path on the most downstream side in the conveyance direction of the staple processing tray F provided with the sheet bundle deflecting means, and is folded in the middle.

<Folding process>
The center folding processing tray G is installed along the upper bundle conveyance guide plate 92, the lower bundle conveyance guide plate 91, and the upper bundle conveyance guide plate 92 which are installed in the substantially vertical direction from the outer periphery of the discharge roller 56 on the movable guide 55 side. The upper bundle conveying roller 71, the lower bundle conveying roller 72, the folding roller 81 provided adjacent to the bundle conveying guide plates 91 and 92, the conveying path H extending horizontally from the nip to the folding roller 81, and the most downstream of the conveying path H A lower discharge roller 83 provided on the side, a folding plate 74 provided so as to be able to reciprocate in a horizontal direction with respect to the nip of the folding roller 81, and a movable rear end protruding into the conveyance path under the bundle conveyance guide plate 91 A fence 73, a moving mechanism for moving the movable rear end fence 73 up and down, a bundle arrival sensor 321 provided on the downstream side of the bundle conveying roller 72 in the sheet bundle conveying direction and upstream of the folding position, the movable rear end Having a folding unit passage sensor 323 for detecting a sheet bundle which passes through the movable rear end fence HP sensor 322, and the conveying path H for detecting the home position of the fence 73.

  The folding plate 74 has a function of reciprocating in the horizontal direction with respect to the nip of the folding roller 81 to fold the paper and push it into the nip of the folding roller 81. The moving mechanism of the folding plate 74 is shown in FIGS. The folding plate 74 is supported by loosely fitting the long hole portions 74 a to the two shafts 64 c erected on the front and rear side plates 64 a and 64 b, and the shaft portion 74 b erected from the folding plate 74 is further connected to the link arm 76. The folding plate 74 is reciprocated in the left-right direction in FIGS. 4 and 5 by being loosely fitted in the long hole portion 76b and the link arm 76 swinging about the fulcrum 76a. That is, the shaft portion 75b of the folding plate driving cam 75 is loosely fitted in the elongated hole portion 76c of the link arm 76, and the link arm 76 swings due to the rotational movement of the folding plate driving cam 75. 6, the folding plate 74 reciprocates in a direction perpendicular to the upper and lower bundle conveyance guide plates 91 and 92.

The folding plate driving cam 75 is rotated by the folding plate driving motor 166 in the direction of the arrow in FIG. The stop position is determined by detecting both end portions of the half-moon shaped shielding portion 75a by the folding plate HP sensor 325.
FIG. 4 shows a home position position completely retracted from the sheet bundle accommodation area of the processing tray G. When the folding plate drive cam 75 is rotated in the direction of the arrow, the folding plate 74 moves in the direction of the arrow and protrudes into the sheet bundle accommodation area of the processing tray G.
FIG. 5 shows a position where the center of the sheet bundle of the processing tray G is pushed into the nip of the folding roller 81. When the folding plate drive cam 75 is rotated in the direction of the arrow, the folding plate 74 moves in the direction of the arrow and retracts from the sheet bundle accommodation area of the processing tray G.

  In the present embodiment, it is assumed that the sheet folding is performed by folding a bundle of sheets. However, the present invention can be applied to the case of folding one sheet. In this case, saddle stitching is not required for only one sheet, so when one sheet is discharged, the sheet is fed to the middle folding processing tray G side, folded by the folding plate 74 and the folding roller, and discharged to the lower tray 203. Make paper.

  The above is a basic outline of the operation. As shown in FIG. 7, a driving unit for the folding roller pair 81 is provided for each roller, and the folding roller pair 81 is installed with a gap of about one sheet. With this configuration, even if only one side of the folding roller pair 81 is driven, an increase in load due to friction between the rollers can be prevented. As described above, the folding blade 74 projects into the gap to fold the paper.

  In this example, the folding rollers 81a and 81b are provided with separate driving units. However, the driving force may be transmitted from a common driving unit via different transmission mechanisms.

According to this embodiment, it is possible to prevent bulging due to the fold elasticity of the folded sheet bundle and adversely affecting the appearance quality and stacking quality. This bulging of the middle fold is eliminated by folding the fold apex in both directions or in one direction.
Further, by individually driving the folding roller pairs and rotating them at the same speed, it is possible to eliminate a conveyance failure due to subtle variations in the diameter of the folding roller pairs, and to further improve the mechanical reliability.

[Second Embodiment]
A second embodiment in which the present invention is suitably implemented will be described. The configuration of the sheet post-processing apparatus is the same as that of the first embodiment.

  The operation from the binding process of the sheet bundle conveyed to the staple processing tray F to the discharging of the sheet bundle folded in the middle folding process tray G to the lower tray 203 via the conveyance path H will be described.

  The paper sorted from the conveyance path A by the branch claw 15 and the branch claw 16 is guided to the conveyance path D by the conveyance roller pairs 7, 9, 10, and is conveyed to the conveyance roller 7, the conveyance roller 9, the conveyance roller 10, and the staple paper discharge roller 11. Is discharged to the processing tray F. In the processing tray F, the sheets sequentially discharged by the staple discharge roller 11 are aligned. Thereafter, the sheet bundle is carried downstream by a discharge claw 52a for a predetermined distance set for each sheet size, and the center thereof is bound by the saddle stitching stapler S2. The bound sheet bundle is conveyed by a discharge claw 52a downstream by a predetermined distance set for each sheet size, and the leading end of the sheet bundle is sandwiched between a discharge roller 56 and a pressure roller 57, and a branch guide plate 54 and a movable guide. The path to the processing tray G formed by rotating 55 is conveyed again downstream by the discharge claw 52a and the discharge roller 56 (FIG. 8).

  The discharge roller 56 is provided on the drive shaft of the discharge belt 52 and is driven in synchronization with the discharge belt 52. Then, the sheet bundle is moved from the home position to a position corresponding to the sheet size in advance by the upper bundle conveying roller 71 and the lower bundle conveying roller 72 and stopped so as to guide the lower end surface. It is conveyed to the fence 73. At this time, the discharge claw 52a stops at a position where another discharge claw 52a ′ arranged at a position facing the outer periphery of the discharge belt 52 reaches the vicinity of the rear end fence 51, and the branch guide plate 54 and the movable guide 55 returns to the home position and prepares for the next sheet.

  The sheet bundle abutted against the movable rear end fence 73 is released from the pressurization of the lower bundle conveying roller 72 (FIG. 8). After that, the vicinity of the stapled portion is pushed by the folding plate 74 in a substantially right angle direction, and is guided to the nip of the opposing folding roller 81. In the present embodiment, only the 81a side of the pair of folding rollers 81a and 81b rotates in the direction of pushing back the sheet bundle, and 81b is in a stopped state. By applying pressure from the folding blade 74 and the action of the folding roller 81a, pressure can be applied from the outside of the sheet bundle, and further folding can be made at the folding vertex.

  The front end of the folded sheet bundle enters the nip portion of the lower conveyance roller 83. At this time, the folding roller 81 and the lower paper discharge roller 83 stop rotating and prepare for the next paper bundle. On the other hand, the lower conveyance roller 83 discharges the folded sheet bundle to the lower discharge tray 203 side. If the next job is the same sheet size and the same number of sheets, the movable rear end fence 73 may stand by at that position. The movable rear end fence can be moved up and down by a motor (not shown) between both pulleys by a timing belt stretched between a pair of pulleys.

  According to the present embodiment, it is possible to suppress the swelling of the protons by further folding the folding vertex of the sheet by the wall due to the projection of the folding blade and the rotation of one of the folding rollers impeding the blade protruding direction. is there. By forming one corner at the folding apex, the storage stability, stackability, appearance quality, and the like of the sheet bundle after saddle stitching are improved, and a space-saving and inexpensive apparatus can be achieved without greatly changing the layout of the current configuration.

[Third Embodiment]
A third embodiment in which the present invention is preferably implemented will be described. The configuration of the sheet post-processing apparatus is the same as that of the first embodiment.
Although the operation of rotating the sheet bundle only in the folding roller 81a side of the pair of folding rollers 81a and 81b by the protrusion of the folding blade 74 and making the corner of the sheet bundle corner is the same as in the second embodiment, this embodiment In the embodiment, after the rotation of the folding roller 81a is further stopped, this time, the folding roller 81b is rotated in the same direction to make creases at both corners of the folding vertex. After the rotation of the folding roller 81b is stopped, the pair of folding rollers 81a and 81b are simultaneously rotated in the forward direction to be conveyed to the lower conveying roller 83.

  According to the present embodiment, the folding fold of the paper is further creased by the wall due to the protrusion of the folding blade and the rotation of one of the folding rollers impeding the blade protruding direction, and the other roller rotates in the same manner. Thus, it becomes possible to add two corners to the folding apex, thereby further suppressing the swelling of the paper. By forming two corners at the folding apex, the storage property, stackability, and appearance quality of the sheet bundle after saddle stitching are improved, and a space-saving and inexpensive device can be achieved without greatly changing the layout of the current configuration.

[Fourth Embodiment]
A fourth embodiment in which the present invention is preferably implemented will be described. The configuration of the sheet post-processing apparatus is the same as that of the first embodiment.
Although the operation of rotating the sheet bundle only in the folding roller 81a side of the pair of folding rollers 81a and 81b by the protrusion of the folding blade 74 and making the corner of the sheet bundle corner is the same as in the second embodiment, this embodiment In the embodiment, after the rotation of the folding roller 81a is further stopped, this time, the folding roller 81b is rotated in the same direction to make a crease at both corners of the folding vertex.

  After the rotation of the folding roller 81b is stopped, the folding blade 74 is kept in the protruding position until the pair of folding rollers 81a and 81b are simultaneously rotated in the forward direction, whereby the position of the top of the sheet is positioned at the folding roller nip. When the folding is completed, the sheet is conveyed to the lower conveyance roller 83.

  In the present embodiment, since the function as a wall by the projection of the folding blade is clear, it is possible to further suppress the swelling of the paper. Accordingly, the storage property, stackability, and appearance quality of the sheet bundle after saddle stitching are improved, and a space-saving and inexpensive device can be achieved without greatly changing the layout of the current configuration.

[Fifth Embodiment]
A fifth embodiment in which the present invention is preferably implemented will be described. The configuration of the sheet post-processing apparatus is the same as that of the first embodiment.
9 and 10 show the state of the middle folding processing tray G during the middle folding operation.
The operation of rotating the sheet bundle only in the direction of pushing back the folding roller pair 81a and 81b by the projection of the folding blade 74 and making the corner of the sheet bundle corner is as described above. In this embodiment, the rotation of 81a is further increased. After stopping, this time, 81b is rotated in the same direction to make creases at both corners of the folding vertex.

  After the rotation of the folding roller 81b is stopped, the folding blade 74 remains in the protruding position until the pair of folding rollers 81a and 81b are simultaneously rotated in the forward direction, whereby the position of the apex of the sheet can be positioned at the folding roller nip. After the folding operation is completed, the folding blade 74 is retracted in preparation for the next bundle.

  According to this embodiment, the folding blade returns to the standby position in preparation for the conveyance of the next bundle, so that the productivity is not lowered.

[Sixth Embodiment]
A sixth embodiment in which the present invention is preferably implemented will be described. The configuration of the sheet post-processing apparatus is the same as that of the first embodiment.
The operation of turning only the folding roller 81a side of the pair of folding rollers 81a and 81b in the direction of pushing back the sheet bundle by projecting the folding blade 74 and making the corner of the sheet bundle corner is the same as in the second embodiment. In the embodiment, after the rotation of the folding roller 81a is further stopped, this time, the folding roller 81b is rotated in the same direction to make creases at both corners of the folding vertex.

  The rotation time of each of the folding rollers 81a and 81b is set in the image forming apparatus PR, although the number of sheets discharged to the processing tray F is counted by the control unit of the processing apparatus and changes according to the number of sheets. The user may set the time according to the finish using the input screen set on the operation panel. For example, if the counter value x of the sheet bundle is 5> x ≧ 1, 50 ms, and if it is 10> x ≧ 5, the rotation time is increased and the folding accuracy is improved as the sheet bundle increases.

  In the present embodiment, the information on the number of sheets in the sheet bundle is input or counted, and the rotation time of the folding roller is made variable so that the fold apex is more accurately squared and the folded sheet is swollen. It can be further suppressed.

[Seventh Embodiment]
A seventh embodiment in which the present invention is preferably implemented will be described. The configuration of the sheet post-processing apparatus is the same as that of the first embodiment.
The operation of turning only the folding roller 81a side of the pair of folding rollers 81a and 81b in the direction of pushing back the sheet bundle by projecting the folding blade 74 and making the corner of the sheet bundle corner is the same as in the second embodiment. In the embodiment, after the rotation of the folding roller 81a is further stopped, this time, the folding roller 81b is rotated in the same direction to make creases at both corners of the folding vertex.

  The rotational speed of each of the folding rollers 81a and 81b is set in the image forming apparatus PR, although the number of sheets discharged to the processing tray F is counted by the control unit of the processing apparatus and is changed according to the number of sheets. The user may set the speed according to the finish using the input screen set on the operation panel. For example, if the sheet bundle counter value x is 5> x ≧ 1, 100 mm / s, and if 10> x ≧ 5, the rotational speed is increased to increase folding accuracy as the sheet bundle increases.

  In this embodiment, the information on the number of sheets in the sheet bundle is input or counted, and the rotation speed of the folding roller is varied, thereby making the folding vertex more accurate and making the folded sheet bulge. It can be further suppressed.

[Eighth Embodiment]
An eighth embodiment in which the present invention is preferably implemented will be described. The configuration of the sheet post-processing apparatus is the same as that of the first embodiment.
Although the operation of rotating the sheet bundle only in the folding roller 81a side of the pair of folding rollers 81a and 81b by the projection of the folding blade 74 and making the corner of the sheet bundle corner is the same as in the second embodiment, this embodiment In the embodiment, after the rotation of the folding roller 81a is further stopped, this time, the folding roller 81b is rotated in the same direction to make creases at both corners of the folding vertex.

  The rotation time and rotation speed of each of the folding rollers 81a and 81b are set in the image forming apparatus PR, although the number of sheets discharged to the processing tray F is counted by the control unit of the processing apparatus and changed according to the number of sheets. The user may make settings according to the degree of finish using the input screen set on the operation panel. For example, if the counter value x of the sheet bundle is 3> x ≧ 1, the sheet is 50 ms · 100 mm / s, if 6> x ≧ 3, 100 ms · 100 mm / s, and if 10> x ≧ 6, the sheet is 100 ms · 200 mm / s. As the number of bundles increases, the rotation time becomes longer and the folding speed is improved by increasing the rotation speed. Further, the rotational speed of the forward rotation in discharging the paper is also set by the input means or the like, so that the subtle variations in the diameters of the folding roller pairs 81a and 81b are adjusted.

  In the present embodiment, the information on the number of sheets in the sheet bundle is input or counted, and the folding roller rotation time and rotation speed are made variable so that the corners of the folding apex are more accurate, and the folded sheet Can be further suppressed.

[Ninth Embodiment]
A ninth embodiment in which the present invention is preferably implemented will be described. The configuration of the sheet post-processing apparatus is the same as that of the first embodiment.
Although the operation of rotating the sheet bundle only in the folding roller 81a side of the pair of folding rollers 81a and 81b by the projection of the folding blade 74 and making the corner of the sheet bundle corner is the same as in the second embodiment, this embodiment In the embodiment, after the rotation of the folding roller 81a is further stopped, this time, the folding roller 81b is rotated in the same direction to make creases at both corners of the folding vertex.

  The protruding amount of the folding blade 74 is set on the operation panel provided in the image forming apparatus PR, although the number of sheets discharged to the processing tray F is counted by the control unit of the processing apparatus and changed according to the number of sheets. The user may set the input screen according to the finished condition. The protruding amount of the folding blade 74 is changed so that the folding vertex tip of the sheet bundle comes to the nip between the pair of folding rollers 81a and 81b.

  In the present embodiment, by changing the protrusion amount of the folding blade, it is possible to make the corners of the folding vertex more accurate and further suppress the bulging of the folded paper.

[Tenth embodiment]
A tenth embodiment preferably implementing the present invention will be described. The configuration of the sheet post-processing apparatus is the same as that of the first embodiment.
Although the operation of rotating the sheet bundle only in the folding roller 81a side of the pair of folding rollers 81a and 81b by the projection of the folding blade 74 and making the corner of the sheet bundle corner is the same as in the second embodiment, this embodiment In the embodiment, since the torque limiter is attached to the drive shaft of the folding roller 81b, when the pair of folding rollers 81a and 81b are simultaneously rotated in the forward direction, the forward rotation in the discharge direction does not require driving the roller. Take around. By rotating only the folding roller 81a in the forward direction after the folding operation is completed, the folding roller 81b is rotated by the sheet conveying force and is conveyed to the lower conveying roller 83.

  In this embodiment, when the folding rollers are individually driven and the folded sheet bundle is discharged by forward rotation in discharging each sheet, the sheet bundle is conveyed by a torque limiter provided on one shaft of the folding roller. Drive energy can be reduced.

  Each of the above embodiments is an example of a preferred embodiment of the present invention, and the present invention is not limited to these and can be variously modified.

It is a figure which shows the structure of the sheet | seat post-processing apparatus which concerns on suitable embodiment of this invention. It is a figure which shows the structure of a staple processing tray. It is a figure which shows the structure of a staple processing tray. It is a figure which shows the structure of the moving mechanism of a folding plate. It is a figure which shows the structure of the moving mechanism of a folding plate. It is a figure which shows the structure of a staple processing tray and a middle folding tray. It is a figure which shows the structure of a drive system about a folding roller pair. It is a figure which shows the middle folding tray at the time of a middle folding operation | movement. It is a figure which shows the middle folding tray at the time of a middle folding operation | movement. It is a figure which shows an example of a middle folding operation | movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Entrance roller 2 Conveyance roller 5, 12 Tapping roller 7, 9, 10 Conveyance roller 8 Pre-stack roller 11 Staple discharge roller 15, 16, 17 Branch claw 51 Rear end fence 52 Release belt 52a, 52a 'Release claw 53 Jogger fence 55 Movable guide 56 Discharge roller 63 Stay 64a, 64b Side plate 64c Shaft 71 Bundle conveying roller 71
72 Bundle conveying roller 72
73 Movable rear end fence 74 Folding plate 74a Long hole portion 74b, 75b, 76b Shaft portion 75 Drive cam 75a Shielding portion 76 Link arm 76a Support point 81 Folding roller 83 Discharge roller 91 Lower bundle conveying guide plate 92 Upper bundle conveying guide plate 100 Punch unit 101 Punch shaving hopper 166 Folding plate drive motor 201 Upper tray 202 Shift tray 203 Lower tray 301 Entrance sensor 321 Bundle arrival sensor 322 Movable rear end fence HP sensor 323 Folding section passage sensor 325 Folding plate HP sensor A, B, C, D, H Conveying path E Paper storage portion F Staple processing tray G Middle folding processing tray S2 Stapler

Claims (13)

A pair of non-contacting means that folds a sheet or a sheet bundle that is disposed in the advancing direction of the protruding means and pushed into the nip by the protruding means. A sheet post-processing apparatus having a folding processing mechanism having a pair of folding rollers capable of rotating forward and backward,
A sheet post-processing apparatus, wherein each folding roller forming the pair of folding rollers is driven independently.   The sheet post-processing apparatus according to claim 1, wherein a driving source is individually installed in each of the folding rollers.   When the sheet or sheet bundle is guided to the nip of the pair of folding rollers by the advancement of the ejecting means, only one of the folding rollers is driven, and the rotation direction is a direction that prevents the advancement of the ejecting means. The sheet post-processing apparatus according to claim 1 or 2.   4. The sheet post-processing apparatus according to claim 3, wherein the protruding means moves backward at a timing when one rotation of the pair of folding rollers is stopped.   When the sheet or sheet bundle is guided to the nip of the pair of folding rollers by advancement of the projecting means, only one of the folding rollers is driven in a direction that prevents rotation of the projecting means after a predetermined time. The sheet post-processing apparatus according to claim 3, wherein the sheet post-processing apparatus is stopped and the other of the folding rollers is driven in a direction that prevents rotation of the protruding means.   6. The sheet post-processing apparatus according to claim 5, wherein the protrusion means moves backward at a timing when the other rotation of the pair of folding rollers is stopped.   7. The ejecting means stops at advancing until the rotation of the folding roller in a direction that prevents rotation of one of the ejecting means is stopped. 8. Sheet post-processing equipment.   The sheet post-processing apparatus according to any one of claims 3 to 7, wherein the rotation time of the folding roller in a direction that prevents the protruding means from moving forward is variable.   9. The sheet post-processing apparatus according to claim 3, wherein the rotation speed of the folding roller in a direction that prevents the protruding unit from advancing is variable.   9. The sheet post-processing apparatus according to claim 3, wherein each of the pair of folding rollers has a variable rotational speed for both forward rotation and reverse rotation.   The sheet post-processing apparatus according to claim 1, wherein a protruding amount of the protruding unit is variable.   12. A torque limiter is provided on one drive shaft of the folding roller, and when the sheet or the sheet bundle is discharged, one of the folding rollers is idled by a frictional force caused by conveyance. The sheet post-processing apparatus according to claim 1.   An image forming system comprising the sheet post-processing apparatus according to claim 1 and an image forming apparatus.

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