JP5760514B2 - Drilling unit, post-processing apparatus and image forming system - Google Patents

Description

  The present invention relates to a punching unit that punches a supplied paper, a post-processing device including the punching unit, and an image forming system including the post-processing device and an image forming device.

  2. Description of the Related Art In recent years, post-processing apparatuses that perform various post-processing such as punching and stapling on paper on which an image is formed by an image forming apparatus have been provided. Such a post-processing apparatus includes a punching unit for performing a punching process, a side stitching unit for performing a staple process, and the like.

  An apparatus for performing a perforation process is described in Patent Document 1, for example. The sheet punching device described in Patent Document 1 includes a plurality of punches having engagement protrusions, and two cam plates disposed on both sides of the plurality of punches, and includes two cams. The plate is provided with a cam groove that engages with an engagement protrusion of each punch.

  In this sheet punching device, when the cam plate is slid, the inclined portion of the cam groove presses the engaging projection and pushes down the punch to punch the paper. Then, one of the two cam plates is slid to select an operating punch among a plurality of punches.

JP 2003-1597 A

  However, in the sheet punching device described in Patent Document 1, since one of the two cam plates is slid, if one drive source is used, the driving force to the cam plate that is not slid from the drive source is reduced. Transmission must be cut off. For this reason, a shut-off mechanism for shutting off the driving force from the drive source is provided, and there is a problem that the number of parts and the cost increase.

  An object of the present invention is to provide a perforating unit, a post-processing apparatus, and an image forming system that do not require the driving force from the driving source to be cut off even if the number of driving sources is one in consideration of the actual situation in the prior art. It is in.

In order to solve the above-described problems and achieve the object of the present invention, a punching unit of the present invention includes a plurality of punches, an engagement protrusion, a first transmission member, a second transmission member, a drive source, and a movement And a mechanism.
The engaging protrusion protrudes from the outer surface of the plurality of punches.
The first transmission member has an engagement groove. Engaging protrusions provided on the punches classified into the first perforation group among the plurality of punches engage with the engaging grooves of the first transmission member.
The second transmission member is opposed to the first transmission member with a plurality of punches in between, and has an engagement groove. Engaging protrusions provided on the punches classified into the second perforation group among the plurality of punches engage with the engaging grooves of the second transmission member.
The drive source has a rotary drive shaft that generates a drive force for moving the first transmission member and the second transmission member.
The moving mechanism transmits the driving force of the driving source to the first transmission member and the second transmission member, and moves the first transmission member and the second transmission member in directions opposite to each other in a direction perpendicular to the direction in which both are opposed to each other. Let
When the first transmission member moves to one side in the movement direction and the second transmission member moves to the other side in the movement direction, the first transmission member presses the engagement protrusion engaged with the engagement groove. The punches classified in the first drilling group are driven in the axial direction.
Further, when the second transmission member moves to one side in the movement direction and the first transmission member moves to the other side in the movement direction, the second transmission member presses the engagement protrusion engaged with the engagement groove. The punches classified in the second drilling group are driven in the axial direction.
At least one of the plurality of punches is a common punch classified into both a first perforation group and a second perforation group.
In the engagement groove of the first transmission member, when the first transmission member moves in the other direction of movement, the portion through which the engagement protrusion provided on the common punch is inserted is the other in the engagement groove of the first transmission member. It is formed wider than the portion.
In the engagement groove of the second transmission member, when the second transmission member moves in the other direction of movement, the portion through which the engagement protrusion provided on the common punch is inserted is the other part of the engagement groove of the second transmission member. It is formed wider than the part.

  The post-processing apparatus of the present invention includes a receiving unit that receives a sheet, a sheet conveying unit that conveys the sheet received by the receiving unit, and a punching unit that performs a punching process on the sheet conveyed by the sheet conveying unit. And the above-mentioned perforation unit is used for this perforation unit.

  The image forming system of the present invention includes an image forming apparatus that forms an image on a sheet, and a post-processing apparatus that performs a punching process on the sheet supplied from the image forming apparatus. The post-processing apparatus includes a receiving unit that receives a sheet, a sheet conveying unit that conveys the sheet received by the receiving unit, and a punching unit that performs a punching process on the sheet conveyed by the sheet conveying unit. And the above-mentioned perforation unit is used for this perforation unit.

In the perforating unit, the post-processing apparatus, and the image forming system configured as described above, the driving force generated by the driving source is transmitted to the first transmission member and the second transmission member by the moving mechanism, and both are moved in opposite directions. Therefore, even when the number of driving sources is one, it is not necessary to cut off the driving force from the driving source. As a result, it is possible to omit a blocking mechanism that blocks the driving force from the driving source, and to reduce the number of parts and the cost.

  That is, in order to perform punching processing on a sheet by punching in the first punching group, the rotational drive shaft of the drive source is rotated in one rotational direction. Thereby, the 1st transmission member moves to one side of a movement direction, and the 2nd transmission member moves to the other side of a movement direction. At this time, the first transmission member presses the engagement protrusion engaged with the engagement groove to drive the punches classified in the first perforation group in the axial direction. As a result, the punches in the first punch group perform punch processing on the supplied paper.

  Further, in order to perform punching processing on the sheet by punching in the second punching group, the rotational drive shaft of the drive source is rotated in the other rotational direction. Thereby, the 2nd transmission member moves to one side of a movement direction, and the 1st transmission member moves to the other side of a movement direction. At this time, the second transmission member drives the punches classified in the second perforation group in the axial direction by pressing the engagement protrusions engaged with the engagement grooves. As a result, the punches of the second punch group perform punch processing on the supplied paper.

  According to the perforation unit, the post-processing apparatus, and the image forming system having the above-described configuration, it is not necessary to cut off the driving force from the driving source even if the number of driving sources is one. Therefore, the blocking mechanism can be omitted, and the number of parts and cost can be reduced.

1 is an overall configuration diagram showing an embodiment of an image forming system of the present invention. It is a longitudinal cross-sectional view which shows one Embodiment of the post-processing apparatus of this invention. It is an external appearance perspective view which shows 1st Embodiment of the perforation unit of this invention. 4A and 4C are partial sectional views of the first embodiment of the drilling unit of the present invention as seen from the side, and FIG. 4B is a plan view of the first embodiment of the drilling unit of the present invention. FIG. 5A and FIG. 5C are partial cross-sectional views of a state in which the drilling process by the first drilling group of the first embodiment of the drilling unit of the present invention has been finished as viewed from the side. FIG. 5B is a plan view showing a state in which the drilling process by the first drilling group of the first embodiment of the drilling unit of the present invention is finished. 6A and 6C are partial cross-sectional views of a state in which the drilling process by the second drilling group of the first embodiment of the drilling unit of the present invention has been finished as viewed from the side. FIG. 6B is a plan view showing a state in which the drilling process by the second drilling group of the first embodiment of the drilling unit of the present invention is finished. It is a top view which shows the engaging groove of the transmission member which concerns on 2nd Embodiment of the piercing | piercing unit of this invention. It is explanatory drawing which shows the structure which provided the rolling element between the engagement protrusion and engagement groove | channel which concern on the punching unit of this invention. It is explanatory drawing which shows the structure which provides a bearing in the punch which concerns on the punching unit of this invention, and supports an engaging protrusion rotatably.

  Hereinafter, embodiments for implementing the punching unit, the post-processing apparatus, and the image forming system will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the common member in each figure.

<Image forming system>
First, an image forming system will be described with reference to FIG.
FIG. 1 is an overall configuration diagram showing an embodiment of an image forming system of the present invention.

  As shown in FIG. 1, the image forming system 1 includes an image forming apparatus 2 and a post-processing apparatus 3 connected to the image forming apparatus 2.

[Image forming apparatus]
First, the image forming apparatus 2 will be described.
The image forming apparatus 2 forms an image on a sheet by an electrophotographic method, and includes a document conveying unit 11, an image reading unit 12, an image forming unit 13, an operation display unit 14, and a control unit 15. ing.

  The document transport unit 11 transports documents one by one to the reading position of the image reading unit 12. The image reading unit 12 reads the image of the document conveyed by the document conveying unit 11 or the document placed on the document table 16 and generates image data.

  The image forming unit 13 includes a drum-shaped photoconductor 21, a charging unit 22 disposed around the photoconductor 21, an exposure unit 23, a developing unit 24, a transfer unit 25 </ b> A, a separation unit 25 </ b> B, and a cleaning unit 26. Yes. The charging unit 22 uniformly charges the surface of the photoconductor 21. The exposure unit 23 performs exposure scanning on the photoconductor 21 based on image data read from the document to form a latent image. The developing unit 24 develops the latent image and forms a toner image on the surface of the photoreceptor 21.

  The paper S1 is stored in the paper storage unit 27. The sheet S1 is fed by the sheet feeding unit 28A and sent to the transfer position where the transfer unit 25A is disposed. The transfer unit 25A transfers the toner image onto the sheet S1 sent to the transfer position. The separation unit 25B erases the charge on the back surface of the sheet S1 to which the toner image is transferred, and separates the sheet S1 from the photosensitive member 21. The sheet S1 separated from the photoreceptor 21 is transported by the intermediate transport unit 28B and sent to the fixing unit 29. The fixing unit 29 heat-fixes the toner image transferred to the paper S1.

  A switching gate 28 </ b> C is disposed on the downstream side in the conveyance direction of the fixing unit 29 (hereinafter referred to as “downstream side”). The switching gate 28C switches the conveyance path of the paper S1 that has passed through the fixing unit 29. That is, the switching gate 28C moves the sheet S1 straight when performing face-up discharge in single-sided image formation. As a result, the sheet S1 is discharged by the pair of discharge rollers 28D. The switching gate 28C guides the sheet S1 downward when performing face-down paper discharge and double-sided image formation in single-sided image formation.

When performing face-down paper discharge, the paper S1 is guided downward by the switching gate 28C, and then the paper transport direction is switched when the rear end of the paper S1 passes through the switching gate 28C, and the pair of paper discharge rollers 28D. Eject paper.
When double-sided image formation is performed, the sheet S1 is guided downward by the switching gate 28C and sent to the sheet reverse conveyance unit 28E, and then sent again to the transfer position via the refeed path 28F, whereby the sheet S1 is turned upside down. Inverted and conveyed to transfer position.

  The cleaning unit 26 removes toner remaining on the surface of the photoreceptor 21.

  The operation display unit 14 has a touch panel and the like, and functions as an input unit through which the user inputs job information for operating the image forming apparatus 2 and the post-processing apparatus 3. In the operation display unit 14, for example, selection of a paper size, selection of the number of sheets, and the like can be input as job information. Furthermore, the selection of whether or not punching processing or stapling processing is performed by the post-processing device 3, the number of sheets to be bound in stapling processing, and the like can be input as job information. The job information input on the operation display unit 14 is transmitted to the control unit 15.

  The operation display unit 14 also has a start button. When the user inputs job information through the operation display unit 14 and presses the start button, the image forming apparatus 2 and the post-processing apparatus 3 start operations based on the input job information. The control unit 15 controls the image forming operation of the image forming apparatus 2 based on the received job information.

  The communication unit 15 a of the control unit 15 is electrically connected to the communication unit 37 a of the post-processing control unit 37 in the post-processing device 3. The control unit 15 of the image forming apparatus 2 performs control such that the post-processing apparatus 3 operates in conjunction with the image forming operation of the image forming apparatus 2 by performing, for example, serial communication with the post-processing control unit 37 of the post-processing apparatus 3. To do.

[Post-processing equipment]
Next, the post-processing device 3 will be described with reference to FIG.
FIG. 2 is a longitudinal sectional view of the post-processing device 3.

The post-processing device 3 performs various post-processing such as punching and stapling on the paper supplied from the image forming apparatus 2.
As shown in FIG. 2, the post-processing device 3 includes the insertion paper feed units 31A and 31B, the receiving unit 32, the paper transport unit 33, the fixed paper discharge table 34, the lift paper discharge table 35, the lower discharge tray. A paper board 36, a post-processing control unit 37, and a plurality of post-processing units to be described later are provided.

  The insertion paper feeding units 31A and 31B are provided on the upper portion of the housing 30 in the post-processing device 3. For example, an insertion sheet such as a cover sheet is stacked on the insertion sheet feeding units 31A and 31B. The receiving unit 32 is opened on the surface of the housing 30 that faces the image forming apparatus 2. The receiving unit 32 receives sheets supplied from the image forming apparatus 2 and sheets stacked on the insertion sheet feeding units 31A and 31B.

  In the following description, the sheets supplied from the image forming apparatus 2 and the sheets stacked on the insertion sheet feeding units 31A and 31B are collectively referred to as a sheet S2.

  The paper transport unit 33 includes a plurality of rollers driven by a motor (not shown) and a plurality of transport paths. The paper transport unit 33 transports the paper S2 to each post-processing unit in accordance with the content of the post-processing executed by the post-processing device 3, and discharges the paper S2 subjected to the post-processing to the outside of the device.

  The fixed paper discharge tray 34 is provided below the insertion paper feed units 31 </ b> A and 31 </ b> B, and the lower paper discharge tray 36 is provided below the housing 30. The elevating paper discharge tray 35 is provided between the fixed paper discharge tray 34 and the lower paper discharge tray 36. The elevating / discharging tray 35 can be moved in the vertical direction by an elevating mechanism (not shown), and can be sequentially lowered to accommodate a large number of sheets S2.

  A plurality of post-processing units such as a punching unit 41, a shift unit 42, a flat stitching unit 43, a saddle stitching unit 44, and a folding unit 45 are arranged inside the housing 30. The post-processing control unit 37 controls the operation of each post-processing unit based on the job information and control information transmitted from the control unit 15 of the image forming apparatus 2.

  The punching unit 41 is provided on the downstream side of the receiving part 32. This punching unit 41 performs punching processing on the sheet S2 when punching processing is selected as job information. If the punching process is not selected as the job information, the punching unit 41 does not operate and the sheet S2 passes through the punching unit 41. The punching unit 41 will be described in detail later.

  A switching gate 46 is provided on the downstream side of the punching unit 41. The switching gate 46 switches the conveyance path of the sheet S2. That is, the switching gate 46 guides the sheet S2 to any one of the first transport path 33a, the second transport path 33b, and the third transport path 33c.

  The switching gate 46 shuts off the second transport path 33b and the third transport path 33c and opens only the first transport path 33a when post-processing is not selected as job information or only punching processing is selected. To do. As a result, the sheet S2 passes through the first transport path 33a and is sent out to the discharge port 30a of the housing 30 by the pair of discharge rollers 48A. The sheets S2 discharged from the discharge port 30a are placed on the fixed discharge table 34 and stacked sequentially.

When the shift process is selected as the job information, the switching gate 46 blocks the first transport path 33a and the third transport path 33c and opens only the second transport path 33b. As a result, the sheet S2 passes through the second conveyance path 33b.
In addition, when only the punching process is selected, the switching gate 46 may block the first transport path 33a and the third transport path 33c and open only the second transport path 33b. In this case, the sheet S2 passes through the second transport path 33b and is discharged to the lifting / lowering tray 35.

  The shift unit 42 is disposed on the second transport path 33b and performs a shift process on the paper S2. In this shift process, the paper S2 is displaced by a predetermined number of sheets in a direction perpendicular to the paper transport direction and parallel to the front and back surfaces of the paper S2. As a result, the sheet S is discharged with its discharge position changed every predetermined number of sheets.

  The sheet S2 shifted by the shift unit 42 is sandwiched between the pair of sheet discharge rollers 48B and sent to the discharge port 30b. The sheets S2 discharged from the discharge port 30b are placed on the lifting / lowering tray 35 and sequentially stacked.

  When the side stitching process, the saddle stitching process or the folding process is selected as the job information, the switching gate 46 blocks the first transport path 33a and the second transport path 33b and opens only the third transport path 33c. Thereby, the sheet S2 passes through the third conveyance path 33c. If the side stitching process is selected, the sheet S2 is guided to the fourth transport path 33d by a switching gate (not shown). On the other hand, when the saddle stitching process or the folding process is selected, the sheet S2 is guided to the fifth transport path 33e by a switching gate (not shown).

  The sheet S2 that has passed through the fourth transport path 33d is sent out by the pair of transport rollers 48C and is sequentially stacked on the stacking plate 51 of the flat stitching section 43. The flat stitching portion 43 includes an accumulation plate 51, a stapler 52, and a stapler moving mechanism 53. The flat stitching unit 43 performs a flat stitching process (staple process) on one side of a plurality of sheets S2 (sheet bundle) stacked on the stacking plate 51.

  The sheet bundle that has undergone the flat binding process is held on the edge subjected to the flat binding process by the discharge claw 56 provided on the discharge belt 55, and is slid on the stacking plate 51 and pushed upward obliquely. Thus, the sheet bundle is sent out to the discharge port 30b by the pair of discharge rollers 48B. The sheet bundle discharged from the discharge port 30b is placed on the lifting / lowering tray 35 and sequentially stacked.

  A saddle stitching portion 44 is disposed on the fifth conveyance path 33e. When the saddle stitching process 44 is selected as job information, the saddle stitching part 44 performs a saddle stitching process (staple process) on a plurality of sheets S2 (sheet bundle) stacked on a sheet stacking unit (not shown). . The sheet bundle subjected to the saddle stitching process is conveyed to the folding unit 45. If the saddle stitching process is not selected, the stapler (not shown) of the saddle stitching portion 44 does not operate, and the sheet bundle passes through the saddle stitching portion 44 and is conveyed to the folding portion 45.

  The folding unit 45 performs the folding process on the sheet bundle when the folding process is selected as the job information. The bundle of sheets subjected to the folding process is sent out to the discharge port 30c by the pair of discharge rollers 48D. The sheet bundle discharged from the discharge port 30c is placed on the lower discharge tray 36 and stacked sequentially.

[First Embodiment of Drilling Unit]
Next, the punching unit 41 will be described with reference to FIGS. 3 and 4.
FIG. 3 is an external perspective view of the punching unit 41. 4A and 4C are partial cross-sectional views of the perforation unit 41 as viewed from the side. FIG. 4B is a plan view of the drilling unit 41. 4A and 4C are shown upside down around the plan view of FIG. 4B.

  As shown in FIG. 3, the punching unit 41 includes a first frame 61, a second frame 62, a plurality of punches 63A to 63D, a first transmission member 64, a second transmission member 65, and a drive source. 66 and a rack and pinion mechanism 67.

The first frame 61 includes an elongated paper passing side frame portion 71 and a drive source side frame portion 72 continuous to one end in the longitudinal direction of the paper passing side frame portion 71.
The sheet passing side frame portion 71 includes substantially rectangular side plates 74 and 75, a bottom plate 76 that is continuous with one long side of the side plates 74 and 75, and a flange 77 that is continuous with the other long side of the side plate 75. ing.

  The side plate 74 is formed with four escape holes (not shown) for avoiding interference with engagement protrusions 95A to 95D (see FIG. 4B) provided on the plurality of punches 63A to 63D. Further, the side plate 75 is formed with two escape holes (not shown) for avoiding interference with engagement protrusions 95E and 95F (see FIG. 4C) provided on the plurality of punches 63B and 63C.

The bottom plate 76 also serves as a first paper passing guide for guiding the supplied paper S2 (see FIG. 2). The surface of the bottom plate 76 opposite to the side from which the side plates 74 and 75 protrude is a sheet passing surface 76a that faces the flat surface (front surface or back surface) of the supplied paper S2. The sheet passing surface 76a is processed into a smooth surface so as not to hinder the conveyance of the sheet S2.
Further, the bottom plate 76 serving as the first sheet passing guide is provided with a blade escape hole 76b through which the plurality of punches 63A to 63D can pass (see FIG. 4C).

  In the present embodiment, the bottom plate 76 that is a part of the first frame 61 is configured to also serve as the first paper passing guide having the paper passing surface 76a. However, the first sheet passing guide according to the present invention may be provided as a member different from the first frame 61. The first sheet passing guide provided as another member is attached to the bottom plate 76 of the first frame 61, for example.

  A punch guide portion 81 that guides the movement of the plurality of punches 63 </ b> A to 63 </ b> D in the axial direction is attached to the paper passing side frame portion 71. The punch guide portion 81 is a guide that opposes the mounting plates 82 and 83 fixed to the side plate 74 and the flange 77 of the paper passing side frame portion 71 and the bottom plate 76 of the paper passing side frame portion 71 with an appropriate distance therebetween. It consists of a piece 84.

The guide piece 84 is provided with guide holes 84a through which the plurality of punches 63A to 63D penetrate, respectively (see FIG. 4C). The plurality of punches 63 </ b> A to 63 </ b> D are restricted from moving in the direction intersecting the axial direction by the guide piece 84, and can move only in the axial direction.
The punch guide portion according to the present invention may be formed integrally with the paper passing side frame portion.

  The drive source side frame portion 72 is formed in a hollow, substantially rectangular parallelepiped shape, and has an opening on the paper passing side frame portion 71 side. A first transmission member 64 and a second transmission member 65 are disposed inside the drive source side frame portion 72 and the paper passing side frame portion 71.

  A drive source bracket 86, a first detector 87 and a second detector 88 are attached to the drive source side frame portion 72. The drive source bracket 86 is fixed to the lower part of the drive source side frame portion 72. A drive source 66 is fixed to the drive source bracket 86. That is, the drive source 66 is attached to the drive source side frame portion 72 of the first frame 61 by the drive source bracket 86.

  The first detector 87 and the second detector 88 are disposed on the side portion of the drive source side frame portion 72 and pass through an opening provided on the side portion of the drive source side frame portion 72 to drive side. It is inserted inside the frame portion 72. The first detector 87 detects the movement distance of the first transmission member 64 from, for example, a reference position described later. Further, the second detector 88 detects a moving distance of the second transmission member 65 from, for example, a reference position described later.

The second frame 62 is set to have substantially the same length as the paper passing side frame portion 71 of the first frame 61. The second frame 62 includes side plates 91 and 92 that are substantially rectangular and an upper plate 93 that is continuous with one long side of the side plates 91 and 92.
The long sides of the side plates 91 and 92 are substantially the same length as the long sides of the side plates 74 and 75 in the paper passing side frame portion 71.

  The upper plate 93 also serves as a second paper passing guide that guides the supplied paper S <b> 2 together with the bottom plate 76. The upper plate 93 is opposed to the bottom plate 76 of the paper passing side frame portion 71 with a predetermined gap. The surface of the upper plate 93 opposite to the side from which the side plates 91 and 92 protrude is a sheet passing surface 93 a that faces the sheet passing surface 76 a of the bottom plate 76. The sheet passing surface 93a is processed into a smooth surface in the same manner as the sheet passing surface 76a.

  Spacers 90A and 90B having a predetermined thickness are interposed between the sheet passing surface 76a and the sheet passing surface 93a. The spacers 90 </ b> A and 90 </ b> B are disposed at both ends of the bottom plate 76 and the upper plate 93 in the longitudinal direction. The upper plate 93 is fixed to the bottom plate 76 by a fixing method such as a fixing screw or an adhesive at a position where the spacers 90A and 90B are disposed.

  By the spacers 90A and 90B, a gap through which the sheet S2 is passed is formed between the sheet passing surface 76a and the sheet passing surface 93a. The supplied paper S2 is inserted between the spacers 90A and 90B and passed in the short direction of the bottom plate 76 and the top plate 93.

  The upper plate 93 is provided with a plurality of blade receiving holes 93b (see FIG. 4C). The plurality of blade receiving holes 93b are opposed to the plurality of blade escape holes 76b of the bottom plate 76, respectively. The plurality of punches 63A to 63D penetrate the plurality of blade receiving holes 93b after passing through the plurality of blade escape holes 76b. At this time, the punching process is performed on the paper S2 passed between the paper passing surface 76a and the paper passing surface 93a.

  In the present embodiment, the upper plate 93 which is a part of the second frame 62 is configured to also serve as the second paper passing guide having the paper passing surface 93a. However, the second sheet passing guide according to the present invention may be provided as a member different from the second frame 62. The second sheet passing guide provided as another member is attached to the upper plate 93 of the second frame 62, for example.

  The plurality of punches 63A to 63D are each formed in a columnar shape. A punching blade 70 (see FIG. 4A) is provided at one end in the axial direction of each of the punches 63A to 63D. The punching blade 70 side of the plurality of punches 63 </ b> A to 63 </ b> D is opposed to the blade receiving hole 76 b of the bottom plate 76 in the paper passing side frame portion 71.

  The plurality of punches 63A to 63D are grouped for each punch used for a specific punching process. In the present embodiment, all the punches 63A to 63D used for the 4-hole drilling process are classified into the first drilling group, and the punches 63B, 63C used for the 2-hole drilling process are classified into the second drilling group. To do. That is, the punches 63B and 63C are common punches classified into both the first perforation group and the second perforation group.

When the punching process is performed by the first punching group, four punch holes are formed in the sheet S2 to be passed between the sheet passing surfaces 76a and 93a. When the punching process is performed by the second punching group, two punch holes are formed in the sheet S2 to be passed between the sheet passing surfaces 76a and 93a.
The number of punches and the perforation group classification can be arbitrarily performed. The number of shared punches is not limited to two, and may be one or three or more. Further, the common punch need not be provided.

  As shown in FIG. 4B, engagement protrusions 95A to 95D are provided on the outer peripheral surfaces of the punches 63A to 63D classified into the first perforation group, respectively. These engagement protrusions 95A to 95D are pins formed in a columnar shape, and protrude in the radially outward direction of the punches 63A to 63D. The engagement protrusions 95A to 95D engage with engagement grooves 101 to 104, which will be described later, of the first transmission member 64, respectively.

  In addition to the engagement protrusion 95B, an engagement protrusion 95E is provided on the outer peripheral surface of the punch 63B classified as the second perforation group. Similarly, an engaging protrusion 95F is provided on the outer peripheral surface of the punch 63C classified as the second drilling group in addition to the engaging protrusion 95C.

  The engagement protrusions 95E and 95F are pins similar to the engagement protrusions 95A to 95D. These engagement protrusions 95E and 95F are disposed on the opposite side of the engagement protrusions 95B and 95C of the punches 63B and 63C, and protrude outward in the radial direction of the punches 63A to 63D. The engagement protrusions 95E and 95F engage with engagement grooves 107 and 108, which will be described later, of the second transmission member 65, respectively.

  The first transmission member 64 and the second transmission member 65 are opposed to each other across the plurality of punches 63A to 63D. The first transmission member 64 is disposed on the side plate 74 side of the paper passing side frame portion 71, and the second transmission member 65 is disposed on the side plate 75 side of the paper passing side frame portion 71.

  As shown to FIG. 4A, the 1st transmission member 64 consists of a substantially rectangular plate. The end surface forming one long side of the first transmission member 64 engages with the inner surface of the guide piece 84 in the punch guide portion 81, and the end surface forming the other long side is the bottom plate 76 in the paper passing side frame portion 71. Is engaged with the inner surface. Thereby, the 1st transmission member 64 is controlled to move in the short direction. The short direction of the first transmission member 64 is parallel to the axial direction of the punches 63A to 63D.

Further, the first transmission member 64 is restricted from moving in the thickness direction by engaging the side plate 74 and a guide rail (not shown). The thickness direction of the first transmission member 64 is parallel to the direction in which the engaging protrusions 95A to 95F protrude.
Accordingly, the first transmission member 64 is movable only in the longitudinal direction. The longitudinal direction of the first transmission member 64 is a direction orthogonal to the direction in which the first transmission member 64 and the second transmission member 65 face each other, and is a direction orthogonal to the axial direction of the plurality of punches 63A to 63D.

  Hereinafter, one of the moving directions of the first transmission member 64 is defined as a first direction X1, and the other is defined as a second direction X2.

The first transmission member 64 has four engagement grooves 101 to 104.
The engagement groove 101 is formed by continuing in the second direction X2 in the order of the start point horizontal portion 101a, the V-shaped portion 101b, and the end point horizontal portion 101c.
The widths of the start point horizontal portion 101a, the V-shaped portion 101b, and the end point horizontal portion 101c are substantially equal to the diameters of the engaging protrusions 95A to 95F. An engagement protrusion 95A provided on the punch 63A engages with the engagement groove 101.

When the first transmission member 64 is disposed at the reference position (home position) shown in FIGS. 4A to 4C, the engaging protrusion 95A is at a predetermined position in the starting horizontal portion 101a.
Here, the reference position is a position at which the first transmission member 64 and the second transmission member 65 are arranged before performing the drilling process by the drilling unit 41.

  The engagement groove 102 is formed by continuing in the second direction X2 in the order of the wide horizontal portion 102a, the wide V-shaped portion 102b, the start point horizontal portion 102c, the V-shaped portion 102d, and the end point horizontal portion 102e.

The widths of the start point horizontal portion 102c, the V-shaped portion 102d, and the end point horizontal portion 102e are substantially equal to the diameters of the engaging protrusions 95A to 95F. On the other hand, the widths of the wide horizontal portion 102a and the wide V-shaped portion 102b are larger than the widths of the start horizontal portion 102c, the V-shaped portion 102d, and the end horizontal portion 102e. An engagement protrusion 95B provided on the punch 63B engages with the engagement groove 102.
When the first transmission member 64 is disposed at the reference position, the engagement protrusion 95B is at a predetermined position in the start point horizontal portion 102c.

The engagement groove 103 has the same shape as the engagement groove 102, and the second direction X2 in the order of the wide horizontal portion 103a, the wide V-shaped portion 103b, the start horizontal portion 103c, the V-shaped portion 103d, and the end horizontal portion 103e. It is formed by continuing. An engagement protrusion 95C provided on the punch 63C is engaged with the engagement groove 103.
When the first transmission member 64 is disposed at the reference position, the engagement protrusion 95C is at a predetermined position in the start point horizontal portion 103c.

The engagement groove 104 has the same shape as the engagement groove 101, and is formed by continuing in the second direction X2 in the order of the start point horizontal portion 104a, the V-shaped portion 104b, and the end point horizontal portion 104c. An engagement protrusion 95D provided on the punch 63D is engaged with the engagement groove 104.
When the first transmission member 64 is disposed at the reference position, the engagement protrusion 95D is at a predetermined position in the start point horizontal portion 104a.

  One end portion of the first transmission member 64 in the longitudinal direction is located inside the drive source side frame portion 72. A rack 105 is provided on a surface facing the second transmission member 65 at one end of the first transmission member 64 in the longitudinal direction. The rack 105 is engaged with a pinion 110 described later.

  As shown in FIG. 4C, the second transmission member 65 is a substantially rectangular plate. The end surface forming one long side of the second transmission member 65 engages with the inner surface of the guide piece 84 in the punch guide portion 81, and the end surface forming the other long side is the bottom plate 76 in the paper passing side frame portion 71. Is engaged with the inner surface. Thereby, the movement of the second transmission member 65 in the short direction is restricted. The short direction of the second transmission member 65 is parallel to the axial direction of the punches 63A to 63D.

  Further, the second transmission member 65 is restricted from moving in the thickness direction by engaging the side plate 75 and a guide rail (not shown). The thickness direction of the second transmission member 65 is parallel to the direction in which the engagement protrusions 95A to 95F protrude. Therefore, the second transmission member 65 can move only in the longitudinal direction.

The longitudinal direction of the second transmission member 65 is a direction orthogonal to the direction in which the first transmission member 64 and the second transmission member 65 face each other, and is a direction orthogonal to the axial direction of the plurality of punches 63A to 63D. That is, it is parallel to the longitudinal direction of the first transmission member 64.
Therefore, one of the movement directions of the second transmission member 65 is the same as one of the movement directions of the first transmission member 64, and is the first direction X1. The other of the moving directions of the second transmission member 65 is the second direction X2.

The second transmission member 65 has two engagement grooves 107 and 108.
The engagement groove 107 has the same shape as the engagement groove 102 of the first transmission member 64, and is in the order of a wide horizontal portion 107a, a wide V-shaped portion 107b, a start point horizontal portion 107c, a V-shaped portion 107d, and an end point horizontal portion 107e. It is formed by continuing in the second direction X2. An engagement protrusion 95E provided on the punch 63B is engaged with the engagement groove 107.
When the second transmission member 65 is disposed at the reference position, the engagement protrusion 95E is at a predetermined position in the start point horizontal portion 107c.

The engaging groove 108 has the same shape as the engaging groove 103 of the first transmission member 64, and is in the order of a wide horizontal portion 108a, a wide V-shaped portion 108b, a start point horizontal portion 108c, a V-shaped portion 108d, and an end point horizontal portion 108e. It is formed by continuing in the second direction X2. An engagement protrusion 95F provided on the punch 63C is engaged with the engagement groove 108.
When the second transmission member 65 is disposed at the reference position, the engagement protrusion 95F is at a predetermined position in the start point horizontal portion 108c.

  One end portion of the second transmission member 65 in the longitudinal direction is located inside the drive source side frame portion 72. A rack 109 is provided on a surface facing the first transmission member 64 at one end in the longitudinal direction of the second transmission member 65. The rack 109 is engaged with a pinion 110 described later.

The drive source 66 (see FIG. 3) is a so-called motor and has a rotational drive shaft 66a. The rotation drive shaft 66 a is inserted into the drive source side frame portion 72. A pinion 110 is attached to the rotation drive shaft 66a. The pinion 110 engages with the rack 105 provided on the first transmission member 64 and the rack 109 provided on the second transmission member 65.
The pinion 110 may be connected to the rotational drive shaft 66a via a gear (gear).

  The rack and pinion mechanism 67 includes the racks 105 and 109 and the pinion 110 described above. The rack and pinion mechanism 67 changes the driving force (rotational force) of the rotary drive shaft 66a to the movement of the first transmission member 64 and the second transmission member 65 in the first direction X1 and the second direction X2 (linear motion). Convert.

When the rotation drive shaft 66a rotates counterclockwise as viewed from above, the first transmission member 64 moves in the first direction X1, and the second transmission member 65 moves in the second direction X2.
On the other hand, when the rotation drive shaft 66a rotates clockwise as viewed from above, the first transmission member 64 moves in the second direction X2, and the second transmission member 65 moves in the first direction X1.
Accordingly, the first transmission member 64 and the second transmission member 65 move in directions opposite to each other.

[Operation of drilling unit]
Next, the operation of the punching unit 41 will be described with reference to FIGS.
As shown in FIG. 4, in the drilling unit 41 before performing the drilling process, the first transmission member 64 and the second transmission member 65 are located at the reference position (home position). At this time, each of the engagement protrusions 95A to 95F is at a predetermined position in each of the start point horizontal portions 101a, 102c, 103c, 104a, 107c, and 108c.

First, the operation of the drilling process by the first drilling group will be described with reference to FIG.
5A and 5C are partial cross-sectional views of the perforation unit 41 that has finished the perforation processing by the first perforation group, as viewed from the side. FIG. 5B is a plan view of the drilling unit 41 after the drilling process by the first drilling group. 5A and 5C are shown upside down around the plan view of FIG. 5B.

  When performing the four-hole drilling process by the first drilling group, the post-processing control unit 37 (see FIG. 2) controls the drive of the drive source 66 (see FIG. 3), and the left when viewed from above the rotary drive shaft 66a. Rotate around. Thereby, the rotational force of the rotational drive shaft 66a is converted into a linear motion by the pinion 110 and the racks 105 and 109, the first transmission member 64 moves in the first direction X1, and the second transmission member 65 moves in the second direction. Move to X2.

  When the first transmission member 64 moves from the reference position in the first direction X1, the engagement protrusions 95A to 95D first engage with the V-shaped portions 101b, 102d, 103d, and 104b of the engagement grooves 101 to 104. . Then, the first transmission member 64 moves the engagement protrusions 95A to 95D toward the second frame 62 until the engagement protrusions 95A to 95D reach the vertexes of the V-shaped portions 101b, 102d, 103d, and 104b. Press.

  Thus, the punches 63A to 63D are driven toward the second frame 62 in the axial direction, and the blade receiving holes 76b of the bottom plate 76 serving as the first sheet passing guide and the blade receivers of the upper plate 93 serving as the second sheet passing guide. It penetrates the hole 93b. As a result, four punch holes are formed in the sheet S2 passed between the bottom plate 76 and the upper plate 93.

  In the present embodiment, when the first transmission member 64 is located at the reference position, each of the engagement protrusions 95A to 95D has the V-shaped portions 101b, 102d, 103d, and 104b of the engagement grooves 101 to 104. The distance to reach is different. Therefore, the driving timing of the punches 63A to 63D is shifted, and the punching process is sequentially performed on the paper S2. Thereby, the stress which arises in the 1st transmission member 64 can be reduced, and the torque of the drive source 66 required in order to move the 1st transmission member 64 and the 2nd transmission member 65 can be saved.

  Thereafter, the engagement protrusions 95A to 95D reach the end point horizontal portions 101c, 102e, 103e, and 104c from the vertex portions of the V-shaped portions 101b, 102d, 103d, and 104b. At this time, the first transmission member 64 presses the engagement protrusions 95A to 95D toward the punch guide portion 81 in the axial direction. Accordingly, the punches 63A to 63D are driven to the side opposite to the second frame 62 side in the axial direction, and come out of the blade escape hole 76b of the bottom plate 76 and the blade receiving hole 93b of the upper plate 93. As a result, the sheet S2 passed between the bottom plate 76 and the upper plate 93 can be conveyed.

  When the first transmission member 64 further moves in the first direction X1, the engagement protrusions 95A to 95D engage with the end point horizontal portions 101c, 102e, 103e, and 104c of the engagement grooves 101 to 104, respectively. 5A to 5C, the engaging protrusions 95A to 95D reach the end portions of the end point horizontal portions 101c, 102e, 103e, and 104c. At this time, since the first transmission member 64 does not press the engagement protrusions 95A to 95D, the punches 63A to 63D do not move in the axial direction.

  On the other hand, when the first transmission member 64 moves from the reference position in the first direction X1, the second transmission member 65 moves from the reference position in the second direction X2. When the engagement protrusions 95A to 95D are engaged with the V-shaped portions 101b, 102d, 103d, and 104b of the engagement grooves 101 to 104, the engagement protrusions 95E and 95F are in the second transmission member 65. The wide V-shaped portions 107b and 108b of the engaging grooves 107 and 108 are inserted. Thereby, the engagement protrusions 95E and 95F are displaced without contacting the second transmission member 65.

  Further, when the engagement protrusions 95A to 95D are engaged with the end point horizontal portions 101c, 102e, 103e, and 104c of the engagement grooves 101 to 104, the engagement protrusions 95E and 95F are engaged with the engagement grooves 107 and 108, respectively. Wide horizontal portions 107a and 108a. Thereby, the engagement protrusions 95E and 95F are displaced without contacting the second transmission member 65. Therefore, when the drilling process by the first drilling group is performed, the engagement protrusions 95E and 95F and the second transmission member 65 do not interfere with each other, and the load on the drive source 66 can be reduced.

When the engagement protrusions 95A to 95D reach the end portions of the end point horizontal portions 101c, 102e, 103e, and 104c, the engagement protrusions 95E and 95F reach the end portions of the wide horizontal portions 107a and 108a. At this time, the first detector 87 and the second detector 88 detect that the first transmission member 64 and the second transmission member 65 have moved a predetermined distance from the reference position, respectively, and the detection result is a post-processing control unit. 37.
A position where the first transmission member 64 and the second transmission member 65 have moved a predetermined distance from the reference position is defined as a folding position.

  When the post-processing control unit 37 (see FIG. 2) receives the detection results from the first detector 87 and the second detector 88, the post-processing control unit 37 controls the drive of the drive source 66 (see FIG. 3) and controls the rotation drive shaft 66a. Stop rotation. Thereafter, the post-processing control unit 37 controls the drive of the drive source 66 again, and rotates the rotary drive shaft 66a clockwise as viewed from above.

Then, the first detector 87 and the second detector 88 detect that the first transmission member 64 and the second transmission member 65 have moved a predetermined distance from the return position, respectively, and the detection result is the post-processing control unit 37. Send to. When the post-processing control unit 37 receives the detection results from the first detector 87 and the second detector 88, the post-processing control unit 37 controls the drive of the drive source 66 and stops the rotation of the rotary drive shaft 66a. Thereby, the 1st transmission member 64 and the 2nd transmission member 65 return to a standard position.
In addition, the punching process by the punches 63A to 63D is performed after the rotation drive shaft 66a rotates clockwise as viewed from above until the first transmission member 64 and the second transmission member 65 return to the reference position. Executed once.

Next, the operation of the drilling process by the second drilling group will be described with reference to FIG.
6A and 6C are partial cross-sectional views of the drilling unit 41 that has been drilled by the second drilling group as viewed from the side. FIG. 6B is a plan view of the drilling unit 41 after the drilling process by the second drilling group. 6A and 6C are shown upside down around the plan view of FIG. 6B.

  When performing the drilling process of two holes by the second drilling group, the post-processing control unit 37 controls the drive of the drive source 66 and rotates the rotary drive shaft 66a clockwise when viewed from above. Thereby, the 2nd transmission member 65 moves to the 1st direction X1, and the 1st transmission member 64 moves to the 2nd direction X2.

  When the second transmission member 65 moves from the reference position in the first direction X1, the engagement protrusions 95E and 95F first engage with the V-shaped portions 107d and 108d of the engagement grooves 107 and 108, respectively. Then, the second transmission member 65 presses the engaging protrusions 95E and 95F toward the second frame 62 until the engaging protrusions 95E and 95F reach the apex portions of the V-shaped parts 107d and 108d.

  On the other hand, when the engaging protrusions 95E and 95F are engaged with the V-shaped portions 107d and 108d of the engaging grooves 107 and 108, the engaging protrusions 95B and 95C are engaged with the engaging groove 102 in the first transmission member 64, respectively. , 103 are inserted into the wide V-shaped portions 102b, 103b. As described above, the width of the wide V-shaped portions 102b and 103b is larger than the diameter of the engaging protrusions 95B and 95C. Thereby, the engagement protrusions 95B and 95C are displaced without contacting the first transmission member 64 moving in the second direction X2.

  Further, the engagement protrusions 95A and 95D are engaged with the start point horizontal portions 101a and 104a of the engagement grooves 101 and 104 in the first transmission member 64, respectively. Therefore, the engagement protrusions 95A and 95D are not pressed by the first transmission member 64 that moves in the second direction X2.

  Thereby, only the punches 63B and 63C as the second perforation group are driven to the second frame 62 side in the axial direction, and the blade escape holes 76b of the bottom plate 76 as the first paper passing guide and the second paper passing guide are used. It passes through a blade receiving hole 93b of a certain upper plate 93. As a result, two punch holes are formed in the sheet S2 passed between the bottom plate 76 and the upper plate 93.

  In the present embodiment, the respective engagement protrusions 95E and 95F reach the V-shaped portions 107d and 108d of the engagement grooves 107 and 108 in a state where the second transmission member 65 is located at the reference position. The distance is different. For this reason, the punches 63B and 63C are driven at different timings and sequentially perform punching processing on the sheet S2. Thereby, the stress which arises in the 2nd transmission member 65 can be reduced, and the torque of the drive source 66 required in order to move the 1st transmission member 64 and the 2nd transmission member 65 can be saved.

  Thereafter, the engaging protrusions 95E and 95F reach the end point horizontal portions 107e and 108e from the vertex portions of the V-shaped portions 107d and 108d. At this time, the second transmission member 65 presses the engagement protrusions 95E and 95F toward the punch guide portion 81 in the axial direction. As a result, the punches 63B and 63C are driven to the side opposite to the second frame 62 side in the axial direction, and come out of the blade escape hole 76b of the bottom plate 76 and the blade receiving hole 93b of the upper plate 93. As a result, the sheet S2 passed between the bottom plate 76 and the upper plate 93 can be conveyed.

  When the second transmission member 65 further moves in the first direction X1, the engagement protrusions 95E and 95F engage with the end point horizontal portions 107e and 108e of the engagement grooves 107 and 108, respectively. 6A to 6C, the engaging protrusions 95E and 95F reach the end portions of the end point horizontal portions 107e and 108e. When the engaging protrusions 95E and 95F are engaged with the end point horizontal parts 107e and 108e, the second transmission member 65 does not press the engaging protrusions 95E and 95F.

  When the engaging protrusions 95E and 95F are engaged with the end point horizontal parts 107e and 108e, the engaging protrusions 95B and 95C are the wide horizontal parts 102a and 103a of the engaging grooves 102 and 103 in the first transmission member 64, respectively. Is inserted. Thereby, the engagement protrusions 95B and 95C are displaced without contacting the first transmission member 64 moving in the second direction X2.

Further, the engagement protrusions 95A and 95D are engaged with the start point horizontal portions 101a and 104a of the engagement grooves 101 and 104 in the first transmission member 64, respectively. Therefore, the engagement protrusions 95A and 95D are not pressed by the first transmission member 64 that moves in the second direction X2.
Therefore, when the engagement protrusions 95E and 95F are engaged with the end point horizontal portions 107e and 108e, the plurality of punches 63A to 63D do not move in the axial direction.

When the engaging protrusions 95E and 95F reach the end portions of the end point horizontal portions 107e and 108e, the engaging protrusions 95B and 95C reach the end portions of the wide horizontal portions 102a and 103a. Further, the engaging protrusions 95A and 95D reach the end portions of the start point horizontal portions 101a and 104a.
At this time, the first detector 87 and the second detector 88 detect that the first transmission member 64 and the second transmission member 65 have moved a predetermined distance from the reference position, respectively, and the detection result is a post-processing control unit. 37. The subsequent returning operation of the first transmission member 64 and the second transmission member 65 to the reference position is the same as the drilling process by the first drilling group.

  In such a drilling process by the second drilling group, the engaging protrusions 95B and 95C do not interfere with the first transmission member 64. Therefore, the load on the drive source 66 can be reduced.

  In the drilling unit 41 described above, the first transmission member 64 and the second transmission member 65 move simultaneously in opposite directions. Therefore, a blocking mechanism for blocking the driving force from the driving source 66 is not necessary. Thereby, the number of parts and cost can be reduced.

  By the way, in the sheet punching device described in Japanese Patent Application Laid-Open No. 2003-1597 (Patent Document 1), one of the two cam plates is selected and slid to operate. Switch punches. Therefore, when providing a common punch, for example, in order to avoid interference between the non-sliding cam plate and the engagement protrusion of the common punch, the cam of each cam plate with which the engagement protrusion of the common punch engages A vertical portion is provided in the groove.

  During standby, the two engaging protrusions of the common punch are positioned above the vertical portion of the cam groove with which they are engaged. When the common punch is pushed down by sliding one of the cam plates, the engaging protrusion of the common punch engaged with the cam groove of the cam plate on the non-sliding side enters the above-described vertical portion.

  If comprised in this way, the common punch at the time of standby will not be supported by either of the two cam plates. For this reason, in the sheet punching device described in Japanese Patent Application Laid-Open No. 2003-1597 (Patent Document 1), a coil spring that biases the common punch and prevents the common punch from falling is provided.

However, if a coil spring that biases the common punch is provided, the number of parts increases. Further, it is necessary to provide notches (escape portions) for avoiding interference with the coil springs on the two cam plates, and the number of processing steps for the two cam plates increases.
Furthermore, the common punch must be pushed down against the biasing force of the coil spring. For this reason, it is necessary to prevent the labor saving of the driving force for sliding the two cam plates and to strengthen the strength of the two cam plates.

  On the other hand, in the punching unit 41 of the present embodiment, the first transmission member 64 and the second transmission member 65 are moved in opposite directions. Therefore, the engaging protrusions provided on the punches 63B and 63C, which are common punches, are engaged with at least one of the transmission members.

Therefore, it is not necessary to provide relief portions extending in the axial direction of the punches 63A to 63D in the engagement grooves 102, 103, 107, and 108 with which the engagement protrusions 95B, 95C, 95E, and 95F of the punches 63B and 63C are engaged. . As a result, the urging member that urges the punches 63B and 63C can be omitted.
Further, since it is not necessary to push down the punches 63B and 63C against the urging force of the urging member, the torque of the drive source 66 necessary for moving the two transmission members can be saved.

[Second Embodiment of Drilling Unit]
Next, a second embodiment of the drilling unit will be described with reference to FIG.
FIG. 7 is a plan view showing the engaging groove of the transmission member in the second embodiment of the punching unit.

  The second embodiment of the drilling unit has the same configuration as the drilling unit 41 of the first embodiment. The second embodiment of the punching unit is different from the punching unit 41 in that the shape of the engaging groove with which the engaging protrusions 95B, 95C, 95E, and 95F (see FIG. 4) provided on the punches 63B and 63C are engaged. Only. In addition, since all the engagement grooves of the present embodiment have substantially the same shape, here, the engagement groove 202 with which the engagement protrusion 95B is engaged will be described as an example.

The first transmission member 164 has an engagement groove 202 with which the engagement protrusion 95B is engaged.
The engagement groove 202 is formed by continuing in the second direction X2 in the order of the opening 202a, the start point horizontal portion 102c, the V-shaped portion 102d, and the end point horizontal portion 102e. When the first transmission member 164 is disposed at the reference position, the engagement protrusion 95B is at a predetermined position in the start point horizontal portion 102c.

  The opening 202a is continuous with the starting point horizontal portion 102c and is formed in a substantially rectangular shape. The opening 202a has two long sides substantially parallel to the first direction X1 and the second direction X2, and two short sides substantially perpendicular to the first and second directions X1 and X2. . One long side of the opening 202a is located above the upper part of the starting point horizontal part 102c, and the other long side is located below the apex part of the V-shaped part 102d. That is, the opening 202a is formed to have a size that avoids interference between the engaging protrusion 95B and the first transmission member 164 when the first transmission member 164 moves in the second direction X2.

  Thereby, when the engagement protrusion 95E (see FIG. 4) is engaged with the V-shaped portion 107d of the engagement groove 107, the engagement protrusion 95B is displaced without contacting the first transmission member 164. Therefore, the load on the drive source 66 can be reduced.

  Further, in the punching unit of the present embodiment, since a part of the engaging groove 202 becomes the opening 202a, it is possible to reduce the weight of the punching unit itself and a post-processing apparatus including the punching unit.

  Note that, as in the present embodiment, the configuration in which a part of the engaging groove is an opening in order to avoid interference between the transmission member and the engaging protrusion is larger in the area of the transmission member than in the first embodiment. Since the area of the engagement groove occupying in this area increases, the strength of the transmission member decreases. Therefore, the configuration in which a part of the engaging groove is an opening is preferably applied when the strength of the transmission member may be relatively low.

  Here, the case where the strength of the transmission member may be relatively low is a case where the resistance of the sheet to the punching process is small. For example, since a thin sheet has a small resistance to punching processing, the stress generated in the transmission member when the punch hole is opened is reduced. Therefore, even if the strength of the transmission member is relatively low, the transmission member is not damaged by the stress.

For example, a sheet having an appropriate thickness has a large resistance to the punching process, so that the stress generated in the transmission member when the punch hole is opened increases. In such a case, it is preferable to apply the first transmission member 64 and the second transmission member 65 according to the first embodiment to sufficiently ensure the strength of the transmission member.
In addition, the transmission member according to the present invention may be appropriately provided with a rib for increasing the strength.

  In the first embodiment described above, the engagement grooves 102 and 103 in the first transmission member 64 and the engagement grooves 107 and 108 in the second transmission member 65 have wide portions (for example, wide horizontal portions 102a and 107a and wide V). Character portions 102b, 107b, etc.). In the second embodiment, the opening 202 a is provided in the engagement groove 202 in the first transmission member 164.

  As a result, when a transmission member that presses the engagement protrusions related to the non-selected perforation group (hereinafter referred to as “non-perforation side transmission member”) moves in the second direction X2, the non-perforation side transmission member and Interference with the engaging protrusion of the common punch can be avoided. That is, the shared punch is not affected by the non-perforated side transmission member. Therefore, a plurality of punches can be driven in the axial direction even if a machining error occurs in the engagement groove, the engagement protrusion, or the like. Further, it is possible to save the torque of the driving source.

  However, the engagement groove according to the present invention is not limited to a configuration in which a wide portion or an opening is provided to avoid interference between the engagement protrusion and the transmission member. That is, the widths of the wide horizontal portions 102a, 103a, 107a, 108a and the wide V-shaped portions 102b, 103b, 107b, 108b according to the first embodiment are made substantially equal to the diameters of the engaging protrusions 95A to 95F. You can also.

  In such a configuration, the non-perforated transmission member and the engagement protrusion of the common punch come into contact with each other, so the torque of the drive source increases. However, the engagement groove and the engagement protrusion of the transmission member are processed with high accuracy. By doing so, the drive of the punch is not hindered by the non-perforated side transmission member.

In the first and second embodiments described above, the punch guide portion 81 that guides the movement of the plurality of punches 63A to 63D in the axial direction is provided. However, as the punching unit according to the present invention, the bottom plate 76 (first paper passing guide) having the blade escape holes 76b may guide the movement of the plurality of punches 63A to 63D in the axial direction.
For example, if the bottom plate 76 has an appropriate thickness, the punching blade 70 side of the plurality of punches 63A to 63D can always be inserted into the blade escape hole 76b. Thereby, the plurality of punches 63A to 63D are restricted from moving in the direction intersecting the axial direction.

  In the first and second embodiments described above, the engaging protrusions 95A to 95F are cylindrical pins protruding from the outer peripheral surfaces of the punches 63A to 63D. However, the engagement protrusion according to the present invention only needs to have a shape that is engaged with the engagement groove, and may be formed, for example, by being bent in an L shape.

  In the punching unit, post-processing apparatus, and image forming system of the present invention, a rolling element is provided between the engaging protrusion protruding from the outer peripheral surface of the punch and the engaging groove provided in the transmission member. Can do.

8A and 8B are explanatory views showing a configuration in which rolling elements are provided between the engaging protrusions and the engaging grooves.
As shown in FIGS. 8A and 8B, the engaging protrusion 395 protrudes from the outer peripheral surface of the punch 363, and a rolling element 396 is rotatably attached to the engaging protrusion 395. Further, the engagement groove 301 is provided in the transmission member 364. The rolling element 396 is engaged with the engagement groove 301 of the transmission member 364 and moves while rotating in the engagement groove 301.

  Thus, by providing the rolling elements 396 between the engagement protrusions 395 and the engagement grooves 301, it is possible to save the torque in the drive source, and to reduce the engagement protrusions 395 and the transmission member 364. Durability can be improved.

  The punching unit, the post-processing apparatus, and the image forming system of the present invention can be configured such that a bearing is provided on the punch and the engaging protrusion is rotatably supported by the bearing.

9A and 9B are explanatory views showing a configuration in which a bearing is provided on the punch.
As shown in FIGS. 9A and 9B, the punch 463 is provided with a bearing bearing 468. An engagement protrusion 495 is rotatably supported on the bearing 468. The engagement groove 401 is provided in the transmission member 464. The engagement protrusion 495 is engaged with the engagement groove 401 of the transmission member 464 and moves while rotating in the engagement groove 401.

  Thus, by providing the bearing 468 on the punch 463 and rotatably supporting the engaging protrusion 495, it is possible to save the torque in the drive source, and also the engaging protrusion 495 and the transmission member 464. The durability of can be improved.

  In the first and second embodiments described above, the punch is formed in a cylindrical shape. However, the punch according to the present invention may be formed in a prismatic shape having a triangular or quadrangular cross section. That is, the engagement protrusion according to the present invention only has to protrude from the outer surface of the punch.

In the first embodiment described above, the movement direction of the first transmission member 64 and the second transmission member 65 is a direction orthogonal to the direction in which the first transmission member 64 and the second transmission member 65 face each other. The direction perpendicular to the axial direction of the plurality of punches 63A to 63D was used.
However, if the first transmission member and the second transmission member are moved in a direction orthogonal to the direction in which they face each other, the engagement protrusion that engages with the engagement groove provided in the first transmission member and the second transmission member. The part can be pressed. Therefore, the moving direction of the first transmission member and the second transmission member according to the present invention may be a direction orthogonal to the direction in which the first transmission member and the second transmission member face each other.

The moving direction of the first transmission member and the second transmission member according to the present invention is a direction orthogonal to the direction in which both are opposed to each other, and intersects the axial direction of the plurality of punches 63A to 63D. preferable. The moving direction of the first transmission member and the second transmission member in this case includes a direction inclined with respect to the sheet passing surface.
With this configuration, it is not necessary to provide an escape portion extending in the axial direction of the shared punch in the engagement groove, and a biasing member that biases the shared punch can be omitted.

Furthermore, the moving direction of the first transmission member and the second transmission member is a direction orthogonal to the direction in which the first transmission member and the second transmission member face each other as in the first and second embodiments described above. Thus, it is more preferable to set the direction perpendicular to the axial direction of the plurality of punches 63A to 63D.
By comprising in this way, the moving direction of a 1st transmission member and a 2nd transmission member becomes parallel with respect to a paper passing surface, and thickness reduction of a perforation unit can be achieved.

  In the first and second embodiments described above, one drive source 66 is provided. However, each of the two drive sources is used to drive the first transmission member and the second transmission member. You may tell. In that case, a pinion is attached to each rotational drive shaft of each drive source.

  The embodiments of the perforation unit, the post-processing apparatus, and the image forming system have been described above including the effects thereof. However, the punching unit, post-processing apparatus, and image forming system of the present invention are not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the invention described in the claims. Is possible.

  DESCRIPTION OF SYMBOLS 1 ... Image forming system, 2 ... Image forming apparatus, 3 ... Post-processing apparatus, 11 ... Document conveying part, 12 ... Image reading part, 13 ... Image forming part, 14 ... Operation display part, 15 ... Control part, 16 ... Document Table, 30 ... Case, 31A, 31B ... Inserted paper feeding unit, 32 ... Accepting unit, 33 ... Paper conveying unit, 37 ... Post-processing control unit, 41 ... Punching unit, 42 ... Shift unit, 43 ... Side binding unit 44 ... Saddle stitching part, 45 ... Folding part, 61 ... First frame, 62 ... Second frame, 63A, 63B, 63C, 63D ... Punch, 64, 164 ... First transmission member, 65 ... Second transmission 66, drive source, 66a, rotational drive shaft, 67, rack and pinion mechanism, 70, punching blade, 71, paper passing side frame, 72, drive source side frame, 74, 75, side plate, 76, bottom plate (First paper passing guide), 76a, 93a... ... Blade escape hole, 77 ... Flange, 81 ... Punch guide part, 82, 83 ... Mounting piece, 84 ... Guide piece, 84a ... Guide hole, 87 ... First detector, 88 ... Second detector, 90A, 90B ... Spacer, 91, 92 ... side plate, 93 ... upper plate (second sheet passing guide), 93b ... blade receiving hole, 95A to 95F ... engagement protrusion, 101, 102, 103, 104, 107, 108 ... engagement groove , 101a, 102c, 103c, 104a, 107c, 108c ... start point horizontal part, 101b, 102d, 103d, 104b, 107d, 108d ... V-shaped part, 101c, 102e, 103e, 104c, 107e, 108e ... end point horizontal part, 102a , 103a, 107a, 108a ... Wide horizontal portion, 102b, 103b, 107b, 108b ... Wide V-shaped portion, 105, 109 ... Rack, 110 ... Pi On, 202 ... engagement groove, 202a ... opening, X1 ... (one of the moving direction) the first direction, X2 ... second direction (the other direction of movement)

Claims (7)

Multiple punches,
An engagement protrusion protruding from an outer surface of the plurality of punches;
A first transmission member having an engagement groove with which the engagement protrusion provided on a punch classified into a first perforation group of the plurality of punches is engaged;
A first engagement groove is provided which is opposed to the first transmission member across the plurality of punches, and engages with the engagement protrusions provided on the punches classified in the second perforation group of the plurality of punches. 2 transmission members;
A drive source having a rotary drive shaft that generates a drive force for moving the first transmission member and the second transmission member;
The driving force of the driving source is transmitted to the first transmission member and the second transmission member, and the first transmission member and the second transmission member are opposite to each other in a direction orthogonal to the direction in which both face each other. A moving mechanism for moving,
When the first transmission member moves to one side in the movement direction and the second transmission member moves to the other side in the movement direction, the first transmission member presses the engagement protrusion engaged with the engagement groove. Drive the punches classified in the first drilling group in the axial direction,
When the second transmission member moves to one side in the movement direction and the first transmission member moves to the other side in the movement direction, the second transmission member presses the engagement protrusion engaged with the engagement groove. Drive the punches classified in the second drilling group in the axial direction,
At least one of the plurality of punches is a shared punch classified into both the first perforation group and the second perforation group,
In the engagement groove of the first transmission member, the portion through which the engagement protrusion provided on the common punch is inserted when the first transmission member moves in the other direction of movement is the engagement of the first transmission member. Formed wider than the rest of the groove,
In the engagement groove of the second transmission member, the portion through which the engagement protrusion provided on the common punch is inserted when the second transmission member moves in the other direction of movement is the engagement of the second transmission member. A perforation unit that is formed wider than the other part of the groove. Multiple punches,
An engagement protrusion protruding from an outer surface of the plurality of punches;
A first transmission member having an engagement groove with which the engagement protrusion provided on a punch classified into a first perforation group of the plurality of punches is engaged;
A first engagement groove is provided which is opposed to the first transmission member across the plurality of punches, and engages with the engagement protrusions provided on the punches classified in the second perforation group of the plurality of punches. 2 transmission members;
A drive source having a rotary drive shaft that generates a drive force for moving the first transmission member and the second transmission member;
The driving force of the driving source is transmitted to the first transmission member and the second transmission member, and the first transmission member and the second transmission member are opposite to each other in a direction orthogonal to the direction in which both face each other. A moving mechanism for moving,
When the first transmission member moves to one side in the movement direction and the second transmission member moves to the other side in the movement direction, the first transmission member presses the engagement protrusion engaged with the engagement groove. Drive the punches classified in the first drilling group in the axial direction,
When the second transmission member moves to one side in the movement direction and the first transmission member moves to the other side in the movement direction, the second transmission member presses the engagement protrusion engaged with the engagement groove. Drive the punches classified in the second drilling group in the axial direction,
At least one of the plurality of punches is a shared punch classified into both the first perforation group and the second perforation group,
In the engagement groove of the first transmission member, when the first transmission member moves in the other direction of movement, the portion through which the engagement projection provided on the common punch is inserted is the engagement projection and the first 1 is an opening of a size that avoids interference with the transmission member,
In the engagement groove of the second transmission member, a portion through which the engagement projection provided on the common punch is inserted when the second transmission member moves in the other direction of movement is the engagement projection and the first 2 Drilling unit that is an opening having a size that avoids interference with the transmission member.   The moving mechanism is engaged with two rack portions provided on opposing surfaces of the first transmission member and the second transmission member, and the two rack portions, and is rotated by a rotation drive shaft of the drive source. The punching unit according to claim 1, wherein the punching unit is a rack and pinion mechanism including a pinion.   The punching unit according to any one of claims 1 to 3, wherein a moving direction of the first transmission member and the second transmission member is a direction orthogonal to an axial direction of the punch.   The punching unit according to any one of claims 1 to 4, further comprising a punch guide portion that guides movement of the plurality of punches in the axial direction. A receiving part for receiving paper,
A paper transport unit for transporting the paper received by the receiving unit;
A post-processing apparatus comprising: the punching unit according to any one of claims 1 to 5, wherein punching processing is performed on the paper transported by the paper transport unit. An image forming apparatus for forming an image on paper;
2. A receiving unit that receives a sheet supplied from the image forming apparatus, a sheet conveying unit that conveys a sheet received by the receiving unit, and a punching process for the sheet conveyed by the sheet conveying unit. An image forming system comprising: a post-processing apparatus having the perforation unit according to any one of 5 .

Images