JP4585953B2 - Sheet processing apparatus and image forming apparatus - Google Patents

Description

  The present invention incorporates / connects an image forming apparatus such as a copying machine, a printer, a facsimile machine, a multifunction machine, etc., a sheet processing apparatus that accepts sheets discharged from an office machine, and stacks them on a stackable tray that can be raised and lowered, and a sheet processing apparatus More particularly, the present invention relates to a structure of a punching device that can easily remove a sheet from a punching device provided in the sheet processing apparatus when a paper jam occurs.

  2. Description of the Related Art A sheet processing apparatus that accepts a sheet conveyed from an image forming apparatus such as a copying machine, a printer, and a facsimile machine and performs various processes such as sorting, staple binding, bookbinding, and punching has been put into practical use. Also, in some models of image forming apparatuses, such a sheet processing apparatus is built in or connected as a purchase option (so-called option).

  The sheet processing apparatus disclosed in Patent Document 1 includes a punching device that forms a file binding hole on the trailing end side of a sheet, and after performing punching processing on a sheet received from a discharge roller pair of the image forming apparatus. It is handed over to the processing equipment. In the processing apparatus, a predetermined number of punched sheets are stacked on the processing tray to form a bundle, and a sheet bundle whose rear end side is stapled is discharged and stacked on the stacking tray.

  This punching device has a lower housing structure that holds the perforated waste storage box so that it can be pulled out to the front side, and an upper housing structure to which a punching mechanism for punching a sheet is attached, and is fixed to the processing device. The upper housing structure is attached to the lower housing structure so as to be rotatable upward (see FIG. 12).

  The image forming apparatus disclosed in Patent Document 2 is housed in a plane of the image reading apparatus under the image reading apparatus (scanner apparatus), and an image forming unit using a photosensitive drum, a processing tray for forming a sheet bundle, and a liftable A stack of sheets is stacked on the processing tray, and a sheet bundle in which the trailing end side is stapled is pushed out and discharged to the stacking tray.

JP 2001-130827 A JP 2001-72311 A

  In the sheet processing apparatus disclosed in Patent Document 1, when a paper jam occurs at the entrance of the sheet processing apparatus, the upper casing structure is greatly lifted upward and supported by a rod. The sheet can be easily removed from the punching mechanism by inserting a finger from above with the housing structure.

  However, since the image forming apparatus disclosed in Patent Document 2 stacks sheets in the cylinder of the downsized image forming apparatus, the mechanism and components are complicated and the perforation as illustrated in Patent Document 1 is performed. It is not easy to secure a space for installing the device.

  Even if the punching device can be reduced in size and placed in the cylinder of the image forming apparatus, the upper housing structure as in the sheet processing apparatus shown in Patent Document 1 is obstructed by the upper image reading apparatus. It is impossible to flip up, and it is impossible to insert a hand from above or to grasp the sheet with a finger inserted between the upper housing structure and the lower housing structure.

  Here, if a structure in which the upper image reading device is opened upward or shifted rearward is employed, the upper housing structure can be flipped upward as in the sheet processing device of Patent Document 1. However, the housing structure of the image forming apparatus becomes complicated, which hinders downsizing and weight reduction, and it becomes necessary to secure an extra evacuation space above and behind the image reading apparatus.

  Further, if the upper casing structure of the punching device is movable upward and the lower casing structure is movable downward, a hand can be inserted from the front side, but the support structure of the lower casing structure becomes complicated. However, the operation of removing the sheet is also complicated, and the possibility that the operation of returning to the initial state after removing the sheet is wrong is increased.

  In addition, if the upper housing structure with no room for upward movement is fixed and the lower housing structure is pulled out or tilted to the front, the perforated waste storage box held in the lower housing structure There is an increased possibility of drilling debris scattered inside and outside the device.

  The present invention makes it easy to remove a jammed sheet from a perforation device without scattering perforation dust even in a sheet processing device arranged in a space where the upper space is limited as in the image forming apparatus disclosed in Patent Document 2. An object of the present invention is to provide a sheet processing apparatus that can be removed easily.

The sheet processing apparatus of the present invention is disposed on the downstream side of the discharge means of the upstream device, a perforating device for perforating the supplied sheet from said discharging means, accept and process sheets perforated by said perforating device in the sheet processing apparatus and a processing unit, pre-Symbol drilling apparatus, the are movably disposed in a direction away from said discharge means together with the processing device, the upper housing having a perforated mechanism for perforating the sheet And a lower housing structure provided at a lower portion of the upper housing structure having a storage box for storing drilling scraps by the punching mechanism, the upper housing structure having the processing device towards the space formed between the drilling device and the discharge means when moved in a direction away from the discharge means, those which are moved rotatably supported by to said lower chassis structure

  In the sheet processing apparatus of the present invention, the upper casing structure is shifted toward the discharge means while maintaining the positional relationship between the lower casing structure and the processing apparatus, so that the upper surface of the lower casing structure is opened so as to be accessible from above. The lower surface of the upper housing structure is opened so as to be accessible from below. Therefore, a work space in which the upper housing structure is retracted is secured above the lower housing structure, and in the case of the image forming apparatus disclosed in Patent Document 2, a hand is inserted in the direction crossing the sheet from the front side to lower the lower housing structure. Even when the upper space and work space are limited, it is possible to remove the jammed sheet and to clean the punching mechanism even when the upper space and the working space are limited.

  Here, when the perforating device is moved horizontally along with the processing device to form a retreat space for the upper housing structure with the upstream device, and the upper housing structure is moved to this retreat space, Since it is not necessary to provide a special retreat space, the substantial occupation space of the sheet processing apparatus is reduced, and the image forming apparatus is downsized accordingly.

  Hereinafter, a sheet processing apparatus 400 according to an embodiment of the present invention and a copier 500 as an embodiment of an image forming apparatus including the sheet processing apparatus 400 will be described with reference to the drawings. The image forming apparatus of the present invention is not limited to the copying machine 500 of the present embodiment, and may be implemented by a facsimile, a printer, a complex machine of these, or the like, and the sheet processing apparatus 400 is an apparatus of the copying machine 500. You may connect to printing apparatuses other than the main body 500A.

  In the following description, the upstream end in the sheet conveying direction of the sheet is the rear end, the downstream end is the leading end, the end along the sheet conveying direction is the side end, and the direction intersecting the sheet conveying direction is the sheet width. Aligning the rear ends of the sheets is the rear end alignment, and aligning the side ends is the side end alignment.

<Image forming apparatus>
FIG. 1 is a front view of a copying machine provided with a sheet processing apparatus according to an embodiment of the present invention. The copier 500, which is an image forming apparatus according to the present invention, includes an apparatus main body 500A, which is an image forming unit, and a sheet processing apparatus 400, which is a sheet processing apparatus.

In the copying machine 500, a reader unit 120 (image reading device) that reads an image of a document and a printer unit 200 that forms an image are combined in an apparatus main body 500A, and an image is formed in a space SP provided on a side portion of the apparatus main body 500A. A sheet processing apparatus 400 that performs stapling processing by stacking the stacked sheets is disposed. An automatic document feeder 300 (hereinafter referred to as “ADF”) that feeds documents one by one onto the platen glass 102 is attached to the upper portion of the apparatus main body 500A so that it can be opened and closed backward.

  The copying machine 500 functions as a copying machine that copies a document image read by the reader unit 120 to a sheet by the printer unit 200, and also receives image data sent from an external personal computer or the like by the printer unit 200 and forms a sheet. It also functions as a printer that prints images. Further, the copier 500 also functions as a facsimile that transmits a facsimile signal of an original image read by the reader unit 120 to another facsimile, or receives a facsimile signal from another facsimile and prints it by the printer unit 200. To do.

  When copying a plurality of originals, the originals are stacked on the ADF 300, sequentially conveyed onto the platen glass 102 of the reader unit 120 one by one, and passed over the stopped scanner unit 104 to perform so-called flow reading. . When copying a document that cannot be handled by the ADF 300, the ADF 300 is opened rearward, the document is placed on the platen glass 102, and the scanner unit 104 is moved in the left-right direction in the figure to perform so-called scanning reading.

  In any case, the image of the band-like region illuminated by the light source 103 of the scanner unit 104 is imaged on the CCD image sensor unit 109 through the mirrors 105, 106, 107 and the lens 108, and a line image is formed by the CCD image sensor unit 109. It is read and converted into an image signal, and digital processing such as image data conversion and image processing is performed.

  The digitally processed image signal is transmitted to the exposure control unit 201 of the printer unit 200, developed, modulated, and converted into an optical signal of laser light. The exposure control unit 201 scans the optical signal and irradiates the photosensitive drum 202, and an electrostatic latent image is formed on the surface of the photosensitive drum 202 by the irradiated light, and the developing unit 203 attaches toner to the latent image. Is developed to form a toner image on the photosensitive drum 202.

  The sheet S is conveyed from the sheet cassettes 204 and 205 in synchronization with the leading edge of the toner image, and the toner image is transferred to the sheet S by the transfer unit 206. The toner image transferred to the sheet S is fixed to the sheet S by being subjected to high temperature and pressure by the fixing unit 207. The sheet S that has been fixed is transferred to the sheet processing apparatus 400 through the sheet discharge unit 208.

  The sheet processing apparatus 400 can stack a large amount of sheets using the upper and lower stack trays 421 and 422 that can be moved up and down, and is stored without protruding from the plane of the apparatus main body 500 </ b> A including the stack trays 421 and 422. ing.

<Sheet processing device>
2 is a partial cross-sectional view of the sheet processing apparatus, FIG. 3 is an explanatory view of the operation of the offset roller, and FIG. 4 is a perspective view of the sheet processing apparatus. The sheet processing apparatus 400 according to the present embodiment can perform staple binding processing using the stapler unit 420 in addition to sorting processing for sorting sheets into two stack trays 421 and 422.

  As shown in FIG. 2, the sheet processing apparatus 400 transfers a processing tray 410 that stacks sheets discharged from the apparatus main body 500 </ b> A (FIG. 1) to form a sheet bundle, and a sheet bundle formed by the processing tray 410. Stack trays 421 and 422 that are stacked in place, and a sheet bundle discharge member 413 that holds the sheet bundle formed by the processing tray 410 integrally with the sheet clamp member 412 and pushes and discharges the stack to the stack tray 421 (or 422). I have.

  The two-stage stack trays 421 and 422 are driven up and down independently, and can be stacked separately using the stack trays 421 and 422 when outputting a printer or facsimile other than a copy job. As illustrated in FIG. 3, the processing tray 410 switches back a sheet using an offset roller 407 and repeats an operation of sandwiching the sheet with a sheet clamp member 412 to form a sheet bundle.

  As shown in FIG. 2, the sheet received from the sheet receiving unit 401 is transferred to the conveyance roller 405 of the sheet processing apparatus 400 and discharged to the processing tray 410. Then, when the sheets are discharged one by one to the stack tray 421 (or 422), as shown in FIG. 3, the contacted offset roller 407 is kept in the normal rotation, and the sheet is left as it is as the stack tray 421 (or 422). ) To send out. However, when forming a sheet bundle, the sheets stacked on the processing tray 410 are pulled back to the sheet trailing edge stopper 411 by rotating the offset roller 407 in the middle.

  The offset roller 407 is a roller member that conveys a sheet by forward rotation, reverse rotation, and offset movement (axial movement), and is supported by an offset roller holder 406 that can rotate about an offset shaft 511 as a fulcrum. Has a cylindrical appearance formed of an elastic body having elasticity close to that of rubber, such as rubber or foam.

  As shown in FIG. 4, the offset roller holder 406 is movable in the sheet width direction along the offset shaft 511. From the pickup solenoid 433, the solenoid arm 512, the lever holder 513, the separation lever 514, and the offset roller holder 406 It is rotated in the vertical direction via As the pickup solenoid 433 is turned on / off, the offset roller 407 is raised / lowered.

  The offset roller 407 is rotated via a timing belt 523, a roller gear 524, an idler gear 525, an offset gear 526, an offset pulley 527, and a timing belt 522 by a conveyance motor 431 that can drive the conveyance roller 405 (FIG. 2) in common. Driven. The offset roller 407 rotates forward to convey the sheet downstream, and reversely conveys the sheet upstream according to the rotation direction of the conveyance motor 431.

  The offset roller 407 moves in the width direction of the sheet and moves toward and away from the width direction positioning wall 416 by driving an offset motor 432 capable of forward and reverse rotation. The rotation of the offset motor 432 is transmitted from the offset motor gear 432a to the offset pinion 516, and is converted into a linear motion along the offset shaft 511 by the offset rack 515.

  As shown in FIG. 2, when the trailing edge of the sheet passes through the inlet sensor 403, the pickup solenoid 433 is turned off, and the normally rotating offset roller 407 descends by its own weight and comes into contact with the sheet. The offset roller 407 reverses after conveying the sheet to the downstream side, pulls the sheet back to the upstream side, and abuts the rear end of the sheet against the sheet rear end stopper 411 provided at the upstream end of the processing tray 410.

  As shown in FIG. 4, the sheet whose rear end has been aligned by abutting against the sheet rear end stopper 411 has the offset roller 407 that abuts as the offset roller 407 stopped rotating approaches the width direction positioning wall 416. The side edges are also aligned by being dragged by the frictional force and passing under the sheet press 510 and coming into contact with the width direction positioning wall 416. The aligned sheets are sandwiched by the sheet clamp member 412 and are held together with the previously stacked sheets.

  In this way, the sheet bundle formed by stacking / aligning a predetermined number of sheets is stapled at the corners of the sheet bundle obliquely by the stapler unit 420 disposed at the corner of the processing tray 410 on the width direction positioning wall 416 side. The binding process is performed. The sheet bundle subjected to the staple binding process is pushed out and discharged by the sheet bundle discharge member 413 to the stack tray 421 (or 422) positioned at a predetermined height position.

<Punching device>
FIG. 5 is an explanatory diagram of the configuration of the punching device viewed from the side of the copying machine, FIG. 6 is an explanatory diagram of the configuration of the punching device viewed from the front side of the copying machine, and FIG. FIG. 8 is an explanatory diagram of the take-out structure of the sheet processing apparatus, and FIG. 9 is a perspective view of the punching apparatus. The sheet processing apparatus 400 according to the present embodiment is disposed on the downstream side of the apparatus main body 500A, which is an upstream apparatus, for example, a punching apparatus 2, for example, a punching waste storage box, for example, a dust box 58, and a punching mechanism. For example, a punch portion 42, a lower housing structure, for example, a base 63, an upper housing structure, for example, a processing unit 61, and a rotation shaft, for example, a support shaft 62 are provided.

  The punching device 2 is a device that opens a file hole on the rear end side of the sheet on which an image is formed in the apparatus main body 500 </ b> A and transfers the file to the sheet processing apparatus 400. The punching apparatus 2 can be used alone without being provided in the apparatus main body 500A of the copying machine 500. In this case, not only the sheet but also a wooden board and a metal plate can be punched. Sheets that can be punched include plain paper, resin sheets that are substitutes for plain paper, and cardboard.

  As shown in FIG. 5, the front plate 31 in the housing 59 of the punching device 2 is provided with a motor 33 that is a drive source of the punch unit 40. The motor gear 34 attached to the shaft 33a of the motor 33 rotates to a drive gear 37 fixed to the drive shaft 38 via a double gear 35 rotatably supported by a gear shaft 36 protruding from the front plate 31. To communicate. The drive shaft 38 is rotatably supported by the front side plate 31 and the rear side plate 32 by a pair of bearings 38a and 38a.

  The punching unit 40 of the punching device 2 sets a two-hole specification for making two holes in the sheet and a three-hole specification for making three holes at the time of assembly according to the order specification. In the case of the two-hole specification, by mounting a drive shaft provided with two punch portions 42, 42 at the position indicated by the broken line, the two punch portions 42, 42 and the die holes 50a, 50a can be simultaneously applied to the sheet. Drill two holes. In the case of the three-hole specification, by mounting the drive shaft 38 having the three punch portions 43, 43, 43, the three punch portions 43, 43, 43 and the die holes 50b, 50b, 50b can be attached to the sheet. Drill three holes at the same time.

  The tip of the punch 47 is inserted into a punch guide 48 fixedly held by the frame body 49 and is slidably positioned. A perforating blade tip 47 a is formed at the tip of the punch 47. The punch guide 48 is formed with a through hole 48a through which the punch 47 passes. The frame body 49 is also formed with a through hole 49a through which the punch 47 passes. The frame body 49 is spanned between the front side plate 31 and the rear side plate 32. A die 50 is stretched between the front side plate 31 and the rear side plate 32 so as to face the frame body 49 with a space necessary for the sheet to pass therethrough. A sheet conveyance path 51 for a sheet to be punched is formed between the frame body 49 and the die 50. The die 50 is formed with a three-hole die hole 50 b that can be engaged with the punching edge 47 a of the punch 47.

  An encoder plate 41a for detecting the rotational speed is fixed to the drive shaft 38, and a read head 41b for taking out a signal corresponding to the rotation angle from the encoder plate 41a is attached to the front side plate 31. The state of the reciprocating movement of the punch 47 is identified by the circuit, and the reciprocating operation is managed.

  As shown in FIG. 6, a light shielding plate 39 having a notch 39 a is fixed to the drive shaft 38, and a transmission sensor 39 b for detecting the notch 39 a of the light shielding plate 39 is disposed on the front side plate 31. The transmission sensor 39b detects the notch 39a of the light shielding plate 39 and identifies a predetermined rotational position of the eccentric cam 44.

  The configuration of the three-hole punch portion 43 and the portion related thereto has been described above. However, the two-hole punch portion 42 has the same configuration as the three-hole punch portion 43, and therefore the same. The same reference numerals are given to the portions, and the description of the portions is omitted. A two-hole die 50 a is also formed in the die 50.

  As shown in FIG. 6, the casing structure of the punching device 2 is divided into a lower base 63 and an upper processing unit 61, and the above-described punch unit 40 is assembled on the processing unit 61 side, while the base 63 A dust box 58 is disposed at a position directly below the drive shaft 38 at the bottom of the box. The dust box 58 can be pulled out to the front side of the copying machine 500 of FIG. 1 and stores punch scraps 67 of the sheet punched out by the punch 47 and the die 50b.

  The transmission sensor 66 disposed on the side wall of the base 63 detects the stack height of the punch scraps 67 in the dust box 58. The transmission sensor 66 detects light reflected by the prism reflector 70 that emits infrared light from the light emitting section 66a (FIG. 5) and is fixed to the inner wall of the dust box 58, at the light receiving section 66b (FIG. 5). When punch scraps 67 accumulate in the dust box 58 and block the optical path 71, it is determined that the dust box 58 is full.

  As shown in FIG. 7, the punching device 2 can open the upper surface of the die 50 by dividing the sheet conveyance path 51 vertically by sliding the processing unit 61 upstream with respect to the base 63. The processing unit 61 is rotatably attached to the processing apparatus main body 2 by a support shaft 62 at both ends in the width direction of the conveyed sheet P.

Since the support shaft 62 is disposed at a position close to the bottom of the base 63 that is lower than the dividing surface of the base 63 and the processing unit 61 and has a large turning radius, the processing unit 61 does not protrude greatly upward. The processing unit 61 can be rotated and opened / closed. Further, since the support shaft 62 is arranged on the upstream side of the base 63, when the processing unit 61 is moved to the retreat space on the upstream side , the distance between the die 50 and the frame body 49 (FIG. 5) gradually increases. It is easy to take out a jammed sheet from the sheet conveyance path 51. Since the support shaft 62 is low, the center of rotation is stable with respect to the center of gravity of the punch both during setting and during jam processing.

As shown in FIG. 8, on the floor surface 503 of the apparatus main body 500A that supports the sheet processing apparatus 400, a rail 502 that runs obliquely from the back side to the front side is installed, and the sheet in which the punching device 2 is assembled integrally. processor 400 is supported on the rails 502 to the obliquely forward by a distance of half the depth of the sheet processing apparatus 400 can be water TairaUtsuri movement.

Further, the processing unit 61 can be opened and closed within the height range of the space SP (FIG. 1) by the low arrangement of the support shaft 62 described above. Therefore, in the case of a paper jam or the like, the punching device 2 is slightly pulled diagonally to the left with respect to the front direction from the device main body 500A, so that the paper can be rotated between the paper discharge unit 501 of the device main body 500 and the punching device 2. A retreat space for retracting the moved processing unit 61 is formed, and the processing unit 61 can be actually opened and closed. By pulling the sheet processing apparatus 400 forward (front side) , fingers are inserted from above to open the frame. The sheet can be easily taken out between the body 49 and the die 50.

  As shown in FIG. 9, the processing unit 61 including the punch unit 40 is rotated in the arrow direction about the support shaft 62, and in this state, the die 50 is moved upward about the upstream side of the base 63. By rotating, it is possible to contact the lower surface of the die 50 from below.

  As described above, since the processing unit 61 including the frame 40e can be rotated to the upstream side, for example, when a sheet carried into the punching device 2 is jammed at a position including the frame 40e, In the space with the paper discharge unit 501, the processing unit 61 does not interfere with the apparatus main body 500 </ b> A, and the jammed sheet can be pulled out together with the processing unit 61 to easily perform the jamming process on the sheet. Further, by turning only the processing unit 61, it is possible to remove the jammed sheet without scattering the punch waste, and even when the processing unit 61 is rotated and returned to the original position, the waste box is displaced, Since the sensor that detects the full load is not erroneously detected, the jam handling performance is improved.

<Punching mechanism and its operation>
FIG. 10 is an enlarged perspective view of the punch portion and the die, and FIG. 11 is an explanatory view of the punching operation by the punch portion and the die.

  As shown in FIG. 10, the punch portion 43 includes an eccentric cam 44 fixed to the drive shaft 38, a cam holder 45 that is slidably fitted on the outer periphery of the eccentric cam 44, and a support shaft 46. And a punch 47 connected to the cam holder 45 so as to be tiltable. The tip of the punch 47 is inserted into a punch guide 48 fixed to the frame body 49 and is slidably positioned. The punch guide 48 is formed with a through hole 48a through which the punch 47 passes.

  As shown in FIG. 11, with one rotation of the drive shaft 38, the punch 47 is moved from (a) the state before drilling to (b) immediately before drilling, (c) during drilling, (d) completion of drilling. After that, (a) ascent and descent to the state before drilling.

  As shown in FIG. 11A, when the drive shaft 38 is rotated from the state where the punch 47 is raised, the eccentric cam 44 is rotated as shown in FIG. The cam holder 45 rotates around the support shaft 46. Then, the punch 47 whose operation is regulated by the support shaft 46 and the punch guide 48 is pressed downward, and as shown in FIG. Fits into the die hole 50b and opens a hole in the sheet. Even after drilling, as shown in FIG. 11 (d), the drive shaft 38 continues to rotate, and the eccentric cam 44 rotates the cam holder 45 around the support shaft 46 to retract the punch 47 upward, Return to the standby position shown in FIG.

  With this configuration, the punch 47 can smoothly reciprocate without the cam holder 45 rattling.

  As shown in FIG. 6, when a hole is made in the sheet S, the sheet S on which an image is formed in the apparatus main body 500A is conveyed into the punching apparatus 2 from the discharge roller pair 208 of the apparatus main body 500A. The leading edge of the sheet S passes through the facing distance between the frame body 49 and the die 50, passes through the sheet inlet conveyance path 401 of the processing apparatus 400, is nipped by the rotating conveyance roller pair 405, and is further conveyed. The sheet S is stopped at a predetermined timing after the trailing edge is detected by a sheet detection sensor (not shown), and the punching position on the trailing edge side of the sheet S is positioned at the punch 47.

  When the sheet S stops, the punch 47 is reciprocated with respect to the die 50 to make a hole in the sheet S. A dust box 58 is provided below the die 50, and punch dust generated by punching is received by the dust box 58. The dust box 58 can be pulled out from the housing 59 of the punching device 2 and taken out.

  When the punching of the sheet S is completed, the conveyance roller pair 405 of the processing apparatus 400 is rotated by a motor (not shown), and the conveyance of the sheet S is resumed. The sheet S is discharged to the stack tray 421 from the offset roller 407 shown in FIG.

<Image forming apparatus of reference example>
FIG. 12 is an explanatory diagram of a configuration of the sheet processing apparatus of the reference example, and FIG. 13 is an explanatory diagram of a configuration of the apparatus main body in which the sheet processing apparatus of the reference example is incorporated as viewed from the side.

  As shown in FIG. 12, the sheet processing apparatus disclosed in Patent Document 1 includes a punching device 2B that forms a binding hole on the rear end side of the sheet, and a dust box storage unit 63B is integrally attached to the sheet processing device 400B. On the other hand, the processing unit 61B in which the punch part 42 (FIG. 5) is incorporated is attached to the support shaft 82 so as to be rotatable upward. Therefore, when a paper jam occurs, the sheet can be taken out from the gap between the dust box storage portion 63B and the processing unit 61B by largely raising the processing unit 61B around the support shaft 82.

  However, in this case, a large space for waiting for the processing unit 61B is required above the punching device 2B, and in the case of the apparatus main body 500A (FIG. 1) having the reader unit 120, the punching device 2 is moved to the front or side of the space SP. It is necessary to pull out the entire sheet processing apparatus 400 including it.

  In other words, since it is difficult to secure a space for opening the processing unit 61B upward, as shown in FIG. 13, the sheet processing apparatus 400 is pulled out to the side to open the punching apparatus 2 upward. In order to prevent the sheet processing apparatus 400 itself from dropping, the apparatus main body 500A must be supported by a certain distance (H). At that time, even if the processing unit 61B is opened upward for jamming, the processing unit 61B 4 and the apparatus main body 500A.

  Even if the rigidity of the rail (502) is increased and the sheet processing apparatus 400 is pulled out to a position where the processing unit 61B can be opened upward, the space for the jam processing is increased, and the jam handling operability is increased. Is bad.

  Further, after the sheet processing apparatus 400 is pulled out in the forward direction, the sheet processing apparatus 400 is rotated to pull out the sheet, and a pile of punch scraps punched by the punch unit 42 is tilted and scattered from the dust box 58. Otherwise, when the processing unit 61B is rotated and returned to the original position, the dust box 58 is displaced, and the transmission sensor 66 that detects the full load of punch scraps may erroneously detect.

  On the other hand, in the copying machine 500 of this embodiment, since the opening / closing process of the processing unit 61 is contained in the space SP, the drawing amount of the sheet processing apparatus 400 can be reduced as shown in FIG. The support structure is simple and thin, and the copying machine 500 can be further thinned.

  As shown in FIG. 13, when a support shaft 92 is provided at a high position of the dust box storage portion 63C and the processing unit 61C incorporating the punch portion 42 (FIG. 5) is rotated, the turning radius of the processing unit 61C is increased. Becomes shorter, and the processing unit 61C jumps upward in the turning process, so that it does not fit in the space SP. On the other hand, in the copying machine 500 of this embodiment, the position of the support shaft 62 is low as shown in FIG. I have to.

  In the sheet processing apparatus 400 according to the present embodiment, when a jam occurs in the sheet in the conveyance path 51 including the punch unit 42 in the sheet processing apparatus 400 built in the apparatus main body 500A, the jammed sheet is scattered with punch scraps. There is provided a sheet processing apparatus and an image forming apparatus that can be easily removed.

1 is a front view of a copying machine including a sheet processing apparatus according to an embodiment of the present invention. It is a partial sectional view of a sheet processing apparatus. It is explanatory drawing of operation | movement of an offset roller. It is a perspective view of a sheet processing apparatus. It is explanatory drawing of the structure which looked at the punching apparatus from the side surface side of the copying machine. FIG. 3 is an explanatory diagram of a configuration of the punching device viewed from the front side of the copying machine. It is explanatory drawing of the rotation structure of the processing unit with respect to a base. It is explanatory drawing of the taking-out structure of a sheet processing apparatus. It is a perspective view of a punching device. It is the perspective view to which the punch part and die were expanded. It is explanatory drawing of the punching operation | movement by a punch part and die | dye. It is explanatory drawing of a structure of the sheet processing apparatus of a reference example. It is explanatory drawing of the structure which looked at the apparatus main body incorporating the sheet processing apparatus of the reference example from the side.

Explanation of symbols

2 Punching device 40 Punch unit 43 Punching mechanism (punch part)
47 Punch 49 Frame body 50 Die 51 Sheet conveyance path 58 Perforated waste storage box (dust box)
66 Transmission sensor 61 Upper housing structure (processing unit)
62 Rotating shaft (support shaft)
63 Lower housing structure (base)
400 processing apparatus, sheet processing apparatus 407 discharge means (offset roller)
410 processing tray 412 sheet clamp member 413 sheet bundle discharge member 420 stapler unit 421, 422 stack tray 500A upstream side apparatus, image forming means (apparatus body)
501 Paper discharge unit

Claims (7)

Is disposed downstream of the discharge means of the upstream device, a perforating device for perforating the supplied sheet from said discharging means,
A processing apparatus for receiving and processing a sheet punched by the punching apparatus,
Before SL punching device, with which is movably disposed in a direction away from said discharge means together with the processing device, the upper housing structure having perforations mechanism for perforating the sheet, the chad by the piercing mechanism A lower housing structure provided at a lower portion of the upper housing structure having a storage box for storing,
The upper housing structure, towards the space in which the processing device is formed between the perforation device and the discharge means when moved in a direction away from said discharge means, moves with respect to the lower chassis structure A sheet processing apparatus, wherein the sheet processing apparatus is movably supported.   The sheet processing apparatus according to claim 1, wherein the lower casing structure is supported so as to be horizontally movable integrally with the processing apparatus in a direction away from the discharge unit. The upper housing structure, by Rukoto is supported to increase the opposing distance with respect to the lower chassis structure in a process of moving toward the space formed between the discharge means and the punching device, the conveyance of the sheet The sheet processing apparatus according to claim 1, wherein the path can be opened by dividing the path vertically .   The sheet processing apparatus according to claim 3, wherein the upper housing structure is rotatable about a rotation shaft disposed at a position lower than a joint surface with the lower housing structure.   5. The sheet processing apparatus according to claim 1, wherein the processing apparatus is supported so as to be horizontally movable toward a front side obliquely from a sheet discharging direction by the discharging unit. 6. An image forming means as the upstream device for forming an image on a sheet;
An image forming apparatus comprising: a processing unit that receives and processes a sheet on which an image is formed by the image forming unit;
6. An image forming apparatus according to claim 1, wherein the processing unit is the sheet processing apparatus according to claim 1. An image reading device for reading an image of a document;
The image forming unit and the processing unit are disposed under the image reading device,
The image forming apparatus according to claim 6, wherein the processing unit is supported so as to be movable away from the image forming unit.

Images