JP2006298503A - Punching hole chip storing device, punching device, sheet treatment device and image formation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accumuration box 58 capable of making deviation of deposition of chips of an accumulation box 58a uniform without requiring an additional device such as a vibrator or the like and rightly performing determination of full of punch chips. <P>SOLUTION: A window 59e of a light path for detecting full is provided on a central part of the accumulation box 58a. Eaves 58c is provided so as to cover the light path for detecting full and an inclination part 58b continued from a position just below a punch 47 of two-hole specification to a lower part of the eaves 58c is provided. In three-hole specification, the eaves 58c shuts off the punch chips pouring from just below the central punch 47 and a heap of the chips is not made at the window 59e. In the two-hole specification, the inclination part 58b moves the punch chips just below the punch 47 to an intermediate position of the two punches 47 and does not delay the detection of full. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image forming apparatus such as a printer, a fax machine, a copier, or a multifunction machine, a sheet processing apparatus mounted in the image forming apparatus, or various kinds of office machines capable of punching a sheet, and stored perforated scraps. The present invention relates to a perforated waste storage device that can accurately detect the fullness of the perforation. The present invention also relates to a punching device, a sheet processing apparatus, and an image forming apparatus equipped with such a punching waste storage device.

  Some models of image forming apparatuses such as printers, FAX machines, copiers, and multifunction machines include a punching device that punches sheets. Some types of sheet processing apparatuses mounted on the image forming apparatus also include a punching device. In the punching device, a punching waste storage device for storing punching waste is removably stored, and a full detection sensor for detecting the fullness of the punching waste stored by the light passing through the punching waste box is provided.

  Patent Document 1 shows a punching device mounted on a copying machine. The punching device disclosed in Patent Document 1 stores a punching waste storage device that stores punching scraps (so-called punching scraps) that accompanies punching so that it can be pulled out to the front side of the copying machine. A light transmission window is arranged in the upper center of the perforated waste storage device, and the perforation device includes a full detection sensor that transmits infrared light through the light transmission window, and the perforated waste accumulated in the perforated waste storage device is red in the full detection sensor. When the outside light is blocked, it is determined that it is full, and full processing such as perforated dust removal display is executed.

JP-A-11-139664

  In image forming apparatuses, sheet processing apparatuses, and punching apparatuses, there is a demand for downsizing the apparatus and reducing manufacturing costs, and in order to save storage space, the punching waste storage apparatus is thinned, reduced in capacity, and punched. An arrangement just below the position is required. However, if the perforated waste storage device placed directly below the perforation position is made thinner, the accumulated height of perforated waste varies between the fall position of the perforated waste and the fall position, and the full detection sensor described above makes a full judgment. It will be scattered.

  In other words, if a pile of perforated waste is formed at the fall position and a valley of perforated waste is formed at the middle position, and the fullness detection sensor detects the position of the peak, the fullness judgment is accelerated and the frequency of picking up perforated waste increases. If the fullness detection sensor detects the position of the valley, the fullness determination is delayed, and the perforated waste overflows from the perforated waste storage device.

  In particular, in a perforating apparatus that can replace two perforating members (punch portions) and three perforating members, this variation in fullness determination causes a serious problem. The positions of the peaks and valleys in the perforated waste storage device are reversed between the time of drilling two and the time of drilling three (see FIG. 12). In the case of two perforations, the valley bottom is detected and the fullness determination is delayed.

  Therefore, in the perforating apparatus disclosed in Patent Document 1, a vibrator is arranged at the bottom of the perforated waste storage device, and the piles and troughs of the perforated waste in the perforated waste storage device are leveled by vibration, so that a constant storage is achieved. The full load can be judged by quantity.

  However, when the vibrator is arranged at the bottom of the perforated waste storage device, the capacity of the perforated waste storage device has to be reduced as much as the storage space of the perforated waste storage device is reduced.

  In addition, when a vibrator or a storage drilling leveling device is provided in the drilling device, the component cost increases, the manufacturing cost of the device increases, and the component weight is added to increase the device weight. Further, the added component arrangement impairs the degree of freedom in designing the main body, which causes new problems such as difficulty in taking out the perforated waste storage device.

  The present invention leveles the crests and valleys of the perforated waste in the perforated waste storage device without providing a vibrator or a leveling device, and fills with almost the same amount of storage regardless of whether two or three are perforated. An object of the present invention is to provide a perforated waste storage device capable of making a judgment.

  The perforated waste storage device of the present invention includes a box member that is located directly below a plurality of perforated members arranged at a predetermined interval and can store perforated waste due to the plurality of perforated members. In the perforated waste storage device in which the height detection position is set to a predetermined height position in the box member, a scissors member is provided above the detection position, and the plurality of perforation members are arranged from at least one side in the arrangement direction. A pouring path for pouring the perforated waste is provided under the eaves member.

  The piercing device of the present invention includes piercing means having piercing members arranged at a predetermined interval, and piercing waste storage means that is stored so as to be capable of being pulled out in the arrangement direction of the piercing members and stores the piercing waste by the piercing member. And a detecting means for detecting the perforated waste by transmitting light in a direction intersecting the direction of the predetermined interval to the perforated waste accommodating means, wherein the perforated waste accommodating means is the perforation according to the present invention. This is a waste storage device.

  The sheet processing apparatus of the present invention is a sheet processing apparatus comprising a punching means for punching a sheet and a sheet stacking member on which the punched sheets are stacked, wherein the punching means is the punching apparatus of the present invention. It is.

  An image forming apparatus according to the present invention includes: an image forming unit that forms an image on a sheet; and a processing unit that processes the sheet on which the image is formed by the image forming unit. The sheet processing apparatus of the present invention is used.

  In the punching waste storage device, punching device, sheet processing apparatus, and image processing device of the present invention, when punching processing is performed using a plurality of punching members, punching scraps are respectively formed at positions corresponding to the punching members of the box member. Get down. However, direct loading and unloading of drilling debris to the detection position is prevented by the saddle member, and loading up to a predetermined height is completed by detecting the drilling debris accumulated by wraparound from the arrangement direction through the pouring path at the detection position. Judgment can be made and full processing can be started.

  Then, since the direct pile does not accumulate at the detection position, when the perforated member is located immediately above the detection position (see FIG. 5), the direct pile becomes a high mountain as it is, and other positions of the box member The drilling waste does not reach the detection position while leaving the reserve capacity. In addition, since the drilling debris is accumulated at the detection position by wrapping around from the arrangement direction through the flow path, even if the drilling member is not located immediately above the detection position, deposition corresponding to the storage amount of the entire box member is formed at the detection position. can do. In addition, the agitation associated with the sneak motion disperses the concentration of drilling debris along the width and length of the pouring path, so that the peaks and valleys of the drilling debris are averaged compared to simply dropping them. Thus, the storage amount of the box member is increased, and the perforated waste does not overflow from the edge of the box member before the perforated waste reaches the detection position.

  Therefore, without providing a vibrator or leveling device, it is possible to level the crests and valleys of the perforated waste in the perforated waste storage device, whether to drill two or three, or in other words, to drill directly above the detection position. Whether a member is present or not can be determined with almost the same amount of storage.

  With reference to the drawings, a perforation apparatus 2 according to an embodiment of the present invention, a post-processing apparatus 400 equipped with the perforation apparatus 2, and an image forming apparatus 500 equipped with a sheet processing apparatus will be described. The punching device 2 includes, for example, a dust box 58 which is one form of the punching waste storage device of the present invention.

  FIG. 1 is an explanatory diagram of a configuration of an image forming apparatus including a punching device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a configuration of a sheet processing apparatus mounted on the image forming apparatus, and FIG. 3 is a part of the sheet processing apparatus FIG. 4 is a schematic perspective view, and FIG. 4 is an explanatory view showing a state in which the sheet is discharged to the processing tray.

  The image forming apparatus 500 according to the present embodiment includes, for example, an apparatus main body 500A that is an image forming unit, and a post-processing device 400 that is a processing unit. The post-processing device 400 includes a punching device 2 that is a punching unit, and a sheet. For example, stacking trays 421 and 422 which are stacking members are provided. However, the punching apparatus 2 according to the present embodiment is not limited to the image forming apparatus 500, but also includes an independent punching apparatus, a sheet processing apparatus capable of various processes such as staple binding, a copying machine, a printer, a multifunction peripheral, and other office machines. It can be installed.

<Image forming apparatus>
As shown in FIG. 1, in an image forming apparatus 500, an automatic document feeder (ADF) 300 is turned on an apparatus main body 500A so as to be opened and closed up and down. The upper part of the apparatus main body 500A is a reader unit (image input apparatus) 120 that reads an image of a document, and the lower part of the apparatus main body 500A is a printer unit 200 that forms an image on a sheet.

  The automatic document feeder 300 takes out the documents one by one from the stacked document bundle and supplies them to the reader unit 120. The reader unit 120 reads an image from a document and converts it into an electrical signal or image data. The reader unit 120 fixes the scanner unit 104 at a position shown in the figure, and reads the document fed by the automatic document feeder 300. Further, it is possible to perform book reading in which a document placed on a contact glass surface (not shown) under the automatic document feeder 300 is read by the moving scanner unit 104. The printer unit 200 forms an electrophotographic image on the sheets S of various sizes taken out from the sheet cassettes 204 and 205.

  The scanner unit 104 of the reader unit 120 includes an illumination lamp 103 and an image capturing mirror 105, and is movable in the left-right direction in the drawing by a transport mechanism (not shown). The image captured from the mirror 105 is incident on the lens 108 through the mirrors 106 and 107 and is formed on the CCD image sensor 109 that reads the line image.

  When performing the flow reading, documents are supplied one by one from a bundle of documents (not shown) stacked on the automatic document feeder 300 to the reader unit 120 and passed over the scanner unit 104 and stacked on the discharge tray. . The image of the original surface illuminated by the lamp 103 is imaged by the CCD image sensor 109 via the optical system described above, and is photoelectrically converted by the CCD image sensor 109 to be converted into an image signal of a line image. The image signal is digitally processed and converted into image data as necessary.

  The printer unit 200 includes an exposure control unit 201 that outputs and scans a light beam in synchronization with the rotating photosensitive drum 202. The exposure control unit 201 modulates the light beam based on the image signal of the line image input from the reader unit 120 and writes the latent image of the line image to a predetermined width on the surface of the photosensitive drum 202 by a scanning mirror (not shown). The developing device 203 electrostatically attracts toner to the surface of the photosensitive drum 202, develops the latent image, and forms a toner image.

  On the other hand, in the lower part of the printer unit 200, sheet cassettes 204 and 205 storing sheets S of various sizes are arranged. The sheets S taken out from the sheet cassette 204 (or 205) one by one are fed into the gap between the photosensitive drum 202 and the transfer unit 206 in accordance with the toner image on the photosensitive drum 202, and the transfer unit 206 causes the photosensitive drum to be transferred. A toner image is transferred from the surface of 202 to the sheet surface. The sheet S on which the toner image is placed is heated and pressurized by the fixing unit 207, and the toner is fused to fix the toner image on the sheet S.

  The sheet S on which image formation has been completed in this manner is conveyed by the discharge roller pair 208 and sent to the post-processing device 400 provided with the punching device 2.

<Sheet processing device>
The post-processing device 400 performs so-called post-processing such as sorting, staple binding, and punching according to a pre-designated operation mode, and processes the processed sheets S in a pre-designated stacking tray (stack tray 421 or stack tray). 422).

  As shown in FIG. 1, the post-processing device 400 is accommodated in a space SP formed on the side of the image forming apparatus main body 500A without protruding from the apparatus main body 500A. The post-processing apparatus 400 includes an apparatus main body 400A provided with a transport roller 405 and an offset roller 407, and two-stage stack trays 421 and 422 that can be moved up and down to an arbitrary height position, and the apparatus main body 500A of the image forming apparatus 500. Then, the sheet S supplied through the discharge roller pair 208 is transferred from the conveying roller 405 to the offset roller 407, and discharged and stacked on the stack trays 421 and 422.

  As shown in FIG. 2, the post-processing device 400 performs a stapling process in which the sheets stacked on the processing tray 410 are stapled by the staple unit 420 in addition to the sorting process for sorting the sheets into the two-stage stack trays 421 and 422, and A punching process for punching two holes at the rear end of the sheet using the punching apparatus shown in FIG. 1 can be executed.

  The stack trays 421 and 422 are supported so as to be movable up and down along the side surface of the post-processing apparatus 400, and each of the stack trays 421 and 422 includes a drive mechanism including a motor (not shown) and can be moved to an arbitrary height position and stopped. Sheets are stacked on the stack trays 421 and 422. When the stack tray 422 on which the sheets are stacked moves up and down through the sheet discharge port 400A, the stacked sheets are moved up and down so as not to slide down to the sheet discharge port 400. A shutter 521 for closing the sheet discharge port 400A is provided.

  As shown in FIG. 2, the post-processing apparatus 400 conveys the sheet received from the entrance 401 by the conveyance roller 405 and delivers it to the offset roller 407. The offset roller 407 can be joined and separated by a swing guide 406 that can turn around a turning shaft 511. The offset roller 407 switches back the sheets and stacks them on the processing tray 410.

  The sheet bundle discharge sensor 415 detects the sheet bundle on the processing tray 410. The formed sheet bundle is stapled at the rear end side by the staple unit 420. The sheet bundle that has been stapled is pushed out by the sheet bundle discharge member 413, conveyed to the offset roller 407, and discharged to the stack tray 421. The stack height of the sheet bundle discharged to the stack tray 421 is detected by the tray sensor 421A, and the stack tray 421 (or 422) is lowered in accordance with the sheet stack height, whereby the stack surface height of the sheet bundle is reached. Is kept constant.

  As shown in FIG. 3, the stapler unit 420 is movable along the edge of the sheet processing tray 410, and is provided at a corner position, two rear ends, or three rear ends of the sheet bundle formed on the sheet processing tray 410. It moves to a predetermined position and staples.

  As shown in FIG. 4, the sheets S discharged to the processing tray 410 can be discharged and stacked on the stack tray 421 as they are through the offset roller 407 without forming a sheet bundle. When making a sheet bundle, when the offset roller 407 switches back the sheet S in the reverse direction, the sheet clamp 412 is opened and the rear end of the sheet S is abutted against the alignment surface, and the sheet clamp 412 is closed and the sheet S is moved. Sandwich. In the same procedure, the second sheet, the third sheet, and the subsequent sheets are sandwiched between the sheet clamps 412.

<Punching device>
FIG. 5 is an explanatory diagram of a configuration of the punching device viewed from the side of the image forming apparatus, FIG. 6 is an explanatory diagram of a configuration of the punching device viewed from the front side of the image forming device, and FIG. FIG. 8 is an explanatory view of a punching operation by a punch portion and a die, FIG. 9 is a perspective view of a punch waste storage device, and FIG. 10 is an explanatory view of a bottom raising member of another form.

  For example, the dust box 58 which is the perforated waste storage device in the present embodiment is a box member, for example, an accumulation portion 58a, a pouring path, for example, an inclined portion 58b, a rod member, for example, a rod 58c, a partition member, for example, a shielding wall 58d, For example, a window 58e which is a detection position is provided.

  The punching device 2 of the present embodiment includes, for example, a punch 47 that is a punching member, a dust box 58 that is punching waste storage means, and a transmission sensor 66 that is detection means.

  The punching device 2 is a device that punches holes in the sheet S on which an image is formed in the main body 500A of the copying machine 500 shown in FIG. In addition, the punching device 2 can be used not only in the main body of the copying machine 500 or the like, but can be used alone to make a hole not only in the sheet S but also in the wooden plate and the metal plate. Therefore, the punching device 2 is not configured to open only the sheet S. The sheet S includes plain paper, resin-made substitutes for plain paper, and cardboard.

  As shown in FIG. 5, the punching device 2 can cope with two holes and three holes in the sheet according to specifications. In the two-hole specification, a drive shaft 38 having two punch portions 42 and 42 indicated by broken lines is equipped at the time of assembly, and the two punch portions 42 and 42 and the die holes 50a and 50a are attached to the rear end of the sheet. Drill two holes. Further, in the three-hole specification, a drive shaft 38 having three punch portions 43, 43, 43 is equipped at the time of assembly, and the sheet is formed by the three punch portions 43, 43, 43 and the die holes 50b, 50b, 50b. Drill three holes at the rear edge. In the following description, a drive shaft 38 having a three-hole specification is provided.

  A motor 33 as a drive source is provided on the front side plate 31 in the casing 59 of the punching device 2. 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 on the front side plate 31 and the rear side plate 32 by bearings 38a and 38a.

  As shown in FIG. 6, a dust box 58 is disposed immediately below the drive shaft 38. The dust box 58 can be pulled out to the front side of the copying machine 500 of FIG. 1 and stores punch scraps of the sheet S punched out by the punch 47 and the die 50b.

  As shown in FIG. 7, the punch portion 43 includes an eccentric cam 44 fixed to the drive shaft 38, a cam holder 45 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. A punching blade edge 47 a (FIG. 5) is formed at the tip of the punch 47.

  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. The frame body 49 is also formed with a through hole 49a (FIG. 5) through which the punch 47 passes.

  As shown in FIG. 5, the frame body 49 is stretched between the front side plate 31 and the rear side plate 32. A die 50 is spanned between the front plate 31 and the rear plate 32 so as to face the frame body 49 and be spaced by an interval necessary for the sheet to pass, and the gap between the frame body 49 and the die 50. Constitutes a sheet conveyance path of the sheet S to be punched. The die 50 is a member common to the two-hole specification and the three-hole specification. The die 50 includes a three-hole specification die hole 50b that can be engaged with the punching edge 47a of the punch 47, and the two-hole specification die hole 50a. Is also formed.

  The configuration of the three-hole punch portion 43 and the related portion has been described above. However, the two-hole punch portion 42 has the same configuration as the three-hole punch portion 42, and therefore the same. The same symbols are attached to the members, and detailed description is omitted.

  As shown in FIG. 8, with one rotation of the drive shaft 38, the punch 47 moves from (a) the state before drilling to (b) immediately before drilling, (c) during drilling, and (d) completion of drilling. After that, (a) ascent and descent to the state before drilling.

  When the drive shaft 38 is rotated from the state in which the punch 47 is raised as shown in FIG. 8A, the eccentric cam 44 is rotated as shown in FIG. 8B, and the cam holder 45 fitted to the outer periphery thereof. Rotates about the spindle 46. Then, the punch 47 whose operation is regulated by the support shaft 46 and the punch guide 48 is pressed downward, and the punching blade edge 47a of the punch 47 is formed at the position where the drive shaft 38 is half-rotated as shown in FIG. The hole 50b is fitted, and a hole is made in the sheet. Even after drilling, the drive shaft 38 continues to rotate as shown in FIG. 8D, 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. Further, as shown in FIG. 6, a sensor flag 39 for detecting the reciprocating movement of the punch 47 is provided at one end of the drive shaft 38. A sensor 40 that detects a sensor flag 39 and an encoder 41 are attached to the front plate 31. The sensor 40 detects the notch 39a of the sensor flag 39, and manages the reciprocating operation of the punch 47 with the encoder 41 and a control circuit (not shown).

  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 opposing distance between the frame body 49 and the die 50, passes through the sheet inlet conveyance path 401 of the post-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 on 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 post-processing device 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.

<Punch waste detection device>
As shown in FIG. 5, the transmission sensor 66 that detects the stack height of punch scraps includes a light emitting unit 66a that emits transmitted light and a light receiving unit 66b that receives the transmitted light from the light emitting unit 66a. The transmission sensor 66 emits transmitted light in a direction that intersects the arrangement direction of the plurality of punch portions 43 attached to the drive shaft 38. A window (68e) is provided on the side surface of the dust box 58 for receiving punch dust generated when a hole is made in the sheet so that the transmitted light of the transmission sensor 66 can pass therethrough.

  As shown in FIG. 6, a transmission sensor 66 is disposed on the inner wall of the punching device 2 and a prism reflector 70 is disposed on the inner wall of the dust box 58 in correspondence with the optical axis 71 that crosses the dust box 58. Light emitted from the transmission sensor 66 passes through a window 58 e provided in the dust box 58, is folded back by the prism reflector 70, and enters the transmission sensor 66 through the optical axis 71. When punch dust accumulates in the dust box 58 and blocks the optical path 71, it is determined that the dust box 58 is full.

  The transmitted light from the light emitting unit 66a of the transmission sensor 66 is received by the light receiving unit 66b without being blocked by the punch scraps 67 until the stack height of the punch scraps 67 reaches a certain height. When the punch scraps 67 are stacked at a predetermined height, the transmitted light from the light emitting unit 66a is blocked by the punch scraps 67 and is not received by the light receiving unit 66b. As a result, the transmission sensor 66 has detected that the punch scraps 67 have reached a predetermined stacking height.

  Since the prism reflector 70 is disposed on the inner wall surface of the dust box 58, the reflected light does not return to the transmission sensor 66 without the dust box 58, and is the same as when the optical axis 71 is blocked by the punch dust 67. When the full warning is given and the dust box 58 is forgotten to be stored, the drilling device 2 is not operated. That is, the transmission sensor 66 also serves as a sensor that detects the presence or absence of the dust box 58.

  However, a transparent window may be disposed at the position of the transmission sensor 66 of the dust box 58 and the prism reflector 70 may be disposed on the inner wall of the punching device 2 facing the transmission sensor 66.

<Dust box>
As shown in FIG. 5, the dust box 58 that receives punch scraps is provided with an inclined portion 58 b below the passage window through which the transmitted light of the transmission sensor 66 passes. The inclined portion 58b is inclined so as to become lower toward the center from one of the punch portions 42, 42 having a two-hole specification, and the lower side of the inclined portion 58b is inserted into the optical path of transmitted light. A collar 58c is attached.

  In the case of the two-hole specification in which the punch portions 42 and 42 are attached, the inclined portion 58b moves punch scraps accumulated below the punch portion 42 to an intermediate position, lowers the piles of punch scraps, and shallows the valleys. . In the case of a three-hole specification with the punch portions 43, 43, 43, the flange 58 c prevents the transmitted light of the transmission sensor 66 from being blocked at the peak of the punch scrap crest by the central punch portion 43.

  As shown in FIG. 9, the inclined portion 58b and the flange 58c are arranged so as to be shifted to one side of the accumulating portion 58a, and a punch dust shielding wall 58d is connected to the edge of the inclined portion 58b. In the case of the three-hole specification with the punch portions 43, 43, 43, the shielding wall 58 d escapes punch scraps from the central punch portion 43 to the distance from the inner wall of the dust box 58, and the punch dust piles increase. To suppress. Apart from the inclined surface 58d and the shielding wall 58d, there is a ridge 58c on the passage path through which the transmitted light of the transmission sensor 66 passes.

  As shown in FIG. 5, in the case of the two-hole specification in which the punch portions 42 and 42 are attached, punch scraps generated when the punch 47 is reciprocated with respect to the die 50 to open a hole in the sheet are inclined portions 58b. Is moved in the direction of a passing window 58e (FIG. 9) through which transmitted light passes through the dust box 58 and loaded.

  On the other hand, in the case of the three-hole specification to which the punch portions 43, 43, 43 are attached, the punch scraps are blocked by the flange 58c so that the passing window 58e (FIG. 9) is not buried under the punch scraps quickly.

  The punch scraps that have reached a predetermined stacking height and become full in the dust box 58 are taken out of the dust box 58 from the casing 59 of the punching device 2 and discarded.

  As described above, since the transmission sensor 66 detects the punch scraps 67 stacked under the passing window through which the transmitted light passes, the number of the punches 47 is changed, and the shape of the mountain formed by the punch scraps changes. The permeation sensor 66 can always detect the amount of punch scrap loaded in a certain amount. Therefore, it is detected that the stack height of punch scraps reaches a predetermined height without being affected by the number of punches 47 that make holes in the sheet, and punch scraps do not overflow from the dust box 58.

  That is, as shown in FIG. 5, the permeation sensor 66 is formed on the sheet by the punching portion 43 for three holes even in the case of punch scraps 67a generated when a hole is made in the sheet by the punching portion 42 for two holes. Also in the case of punch scrap 67b generated when a hole is opened, the stack amount of punch scrap is detected by a predetermined amount.

  As described above, according to the dust box 58 of the present embodiment, if there is no punch 47 on the transmission path of the transmitted light of the transmission sensor 66 according to the specification, the punch 47 is reciprocated with respect to the die, Punch waste generated by punching holes in the sheet is raised by the bottom raising member that raises the punch waste, and the difference in stacking height from the pile of punch waste is reduced, so the filling time is different at both the valley and mountain positions. You don't have to.

  According to the specification, when the punch 47 is on the transmission path of the transmitted light of the transmission sensor 66, punch scrap generated by making a hole in the sheet is blocked by the punch 58c and the punch dust is below the passing light. The pile amount of punch scraps can be properly detected by avoiding the quick accumulation.

  Therefore, even if the hole of the punch 47 differs depending on the specification, the punch waste is always detected with a predetermined load amount, so that the punch waste is fully detected to prevent overflow of the punch waste. be able to.

  The inclined portion 58b shown in FIG. 9 is a straight flat surface as shown in FIG. 10 (a), but may be a curved surface as shown in FIG. 10 (b). The shape which does not have an inclined surface as shown in (c) of this, and raises punch scraps simply may be sufficient. By adjusting the balance between the accumulated height of the drilling scum at the position of the transmission sensor 66 and the total amount stored, the full detection can be performed in accordance with the substantial full timing.

  Moreover, the dust box 58 of this embodiment can be applied not only to the number of two holes and three holes, but also to the number of other holes.

  Further, in the punching device 2 of the present embodiment, the number of punches 47 is determined according to the specification, and only the determined number of punches 47 are attached to make holes in the sheet. There is also a perforating apparatus in which one unit can selectively open a different number of holes in a sheet. The dust box 58 of the present embodiment can also be applied to such a punching device.

<Punching device of comparative example>
FIG. 11 is an explanatory diagram of the configuration of the comparative example of the punching device viewed from the front side of the image forming apparatus, and FIG. 12 is an explanatory diagram of the configuration of the comparative example of the punching device viewed from the side of the image forming apparatus.

  As shown in FIG. 11, a punching device 137 that generates punch scraps is provided as a post-processing device in the main body of the image forming apparatus, and a filing hole is formed in a sheet on which an image is formed in the main body of the image forming apparatus. Open. In addition to the punching device, the post-processing device includes a sorter that sorts the image-formed sheets, a binding device that binds a bundle of sheets, and the like.

  As shown in FIG. 12, the punching device 137 can cope with opening two holes and opening three holes in the sheet according to the specification. In the specification that opens two holes, by mounting the drive shaft 138 including the two punch portions 142, 142, the two punch portions 142, 142 and the die holes 144, 144 open two holes in the sheet. be able to. In addition, in the specification to open three holes, by installing a drive shaft 139 provided with three punch portions 143, 143, 143, the three punch portions 143, 143, 143 and the die holes 145, 145, 145 Three holes can be drilled in the sheet.

  The punch scraps 167 of the punched sheet are received by a dust box 158 disposed below the punch portion and stacked in a mountain shape.

  When the stack height of the stacked punch scraps 167 reaches a predetermined height, the height is detected by a reflection sensor 166 that is a punch scrap detection device that emits light from the direction intersecting the drive shaft 138. The user is informed that the punch scraps 167 are full.

  The reflection sensor 166 includes a light emitting unit 166 a that irradiates light to the prism reflector 168 facing the reflection sensor 166, and a light receiving unit 166 b that receives the light reflected by the prism reflector 168. Therefore, when the stack height of the punch scraps 167 reaches a predetermined height, the light from the light emitting unit 166a is blocked by the punch scraps 167 and cannot reach the prism reflector 168, but is received by the light receiving unit 166b. I can't. Accordingly, the reflection sensor 166 detects that the sheet punch waste 167 has reached a predetermined height in the dust box 158 and has become full.

  However, since the reflection sensor 166 detects the stack height of the punch scraps 167 in the dust box 158 by blocking light, the following problem may occur.

  Where the punching device 137 supports both the two-hole specification and the three-hole specification, the punch scraps 167 fall in the two-hole punch portion 142 and the three-hole punch portion 143. However, punch scraps in the two-hole specification form two peaks as shown by reference numeral 167a, while punch scraps in the three-hole specification form three peaks as shown by reference numeral 167b.

  For this reason, the reflection sensor 166 detects that the punch scraps 167a are filled with the punch scraps 167a when the punching device 137 has a two-hole specification, but the punch punches 167 have three punches. If it is a hole specification, it will be detected that it was light-shielded on the peak of the pile of punch waste 167b, and the punch waste 167b became full. Therefore, the full amount of punch dust detected by the reflection sensor 166 differs between the two-hole specification and the three-hole specification, and punch dust 167a may overflow from the dust box 158 in the case of the two-hole specification. is there. Such a problem is not limited to the two-hole specification and the three-hole specification, and even in the four-hole specification, the pile of punch scraps near the transmission sensor is the same as in the case of the two-hole specification. Similar problems can arise.

  In addition, when three holes are opened by the punch portion 143 for three holes, the deposition rate of punch dust is the fastest immediately below the central punch portion 143 and is close to the reflection sensor 166. When the apparatus 137 opened three holes in the sheet, it was erroneously detected that the punch shading 167b was fully loaded due to light shielding, and as a result, there was a problem that a large amount of punch scraps could not be stacked.

  In order to deal with such a problem, an eccentric cam 170 fixed to the drive shaft 169 is disposed below the dust box 158, and the eccentric cam 170 is rotated in contact with the bottom 158a of the dust box 158 to vibrate the dust box 158. In addition, the pile of punch scraps 167 is broken and flattened, and the stack height of punch scraps is detected regardless of the number of holes opened in the sheet (see Patent Document 1).

  However, in the drilling device of the comparative example, the structure becomes complicated and the assembly becomes difficult and the cost is increased. Furthermore, vibration noise is generated, and another problem occurs in that each part is broken due to vibration. There is a fear.

  Further, as the market needs in recent years, if the dust box 158 is made smaller in the front-rear, left-right, and up-down directions due to the trend of space saving and downsizing of office equipment, the above-mentioned problem is remarkably generated.

  On the other hand, in the punching apparatus of this embodiment described with reference to FIGS. 1 to 10, regardless of whether the two-hole specification or the three-hole specification is used, the punch scrap loading amount is detected by a predetermined amount. In addition, it is possible to prevent scattering of punch scraps, and by mounting such a punching device, the punch scraps are normally taken out. As a result, punch waste does not overflow even in the 2-hole specification, and fullness is not erroneously detected even in the 3-hole specification, so the time for taking out and cleaning the punch waste is reduced, and the burden on the operator is reduced. The operating rate of the forming apparatus is improved.

  In addition, since there is no additional device such as a vibrator, it becomes possible to accurately determine the fullness of punch scraps by making a slight change to the bottom of the dust box, eliminating the need for additional device parts and assembly costs. The size and weight are reduced, and the manufacturing cost is reduced.

  In addition, since there is no additional device such as a vibrator, the capacity of the dust box can be increased without changing the size of the drilling device, and the full time can be further delayed, and the additional device causes difficulty in pulling out and storing the dust box. And there is no worry about vibrator vibration and noise. Accordingly, it is possible to provide an image forming apparatus which is quiet and has a sophisticated design and is easy to use.

It is explanatory drawing of a structure of the image forming apparatus provided with the punching apparatus of embodiment of this invention. FIG. 3 is an explanatory diagram of a configuration of a sheet processing apparatus mounted on the image forming apparatus. It is a partial perspective view of a sheet processing apparatus. It is explanatory drawing of the state by which a sheet | seat is discharged to a processing tray. FIG. 3 is an explanatory diagram of a configuration of the punching device viewed from the side of the image forming apparatus. FIG. 4 is an explanatory diagram of a configuration in which the punching device is viewed from the front side of the image forming apparatus. 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 a perspective view of a perforated waste storage device. It is explanatory drawing of the bottom raising member of another form. It is explanatory drawing of the structure which looked at the punching apparatus of the comparative example from the front side of the image forming apparatus. It is explanatory drawing of the structure which looked at the punching apparatus of the comparative example from the side surface side of the image forming apparatus.

Explanation of symbols

S Sheet 2 Punching device 38, 68 Drive shaft 42, 43 Punch part 47 Punching member (punch)
50 Die 50a, 50b Die hole 58 Perforated waste storage device (dust box)
58a Box member (stacking part)
58b Flow path, inclined surface (inclined part)
58c 庇 member (庇)
58d Bulkhead structure (shield wall)
58e Detection position, light transmission window (window)
66 Detection means (transmission sensor)
67 Punch waste 400 Sheet processing device (post-processing device)
407 Discharge member (offset roller)
421, 422 Sheet stacking member (stack tray)
500 Image forming apparatus 500A Image forming means (apparatus body)

Claims (11)

A box member that is located immediately below the plurality of perforated members arranged at a predetermined interval and that can store the perforated waste from the plurality of perforated members;
In the perforated waste storage device in which the detection position of the accumulated height of the perforated waste is set to a predetermined height position in the box member,
A perforated waste storage device characterized in that a scissor member is provided above the detection position, and a pouring path is provided to allow the perforated waste to flow under the scissors member from at least one side in the arrangement direction of the plurality of perforated members.   2. The perforated waste storage device according to claim 1, wherein the pouring path is an inclined surface that is inclined downward from one side in the arrangement direction of the perforated members toward the bottom of the flange member.   A partition wall structure is provided at the edge of the inclined surface that narrows the width of the inclined surface smaller than the width of the box member and restricts the perforated dust flowing into the inclined surface from the width direction of the box member. The perforated waste storage device according to claim 2.   The detection position is set immediately below a central perforation member of the plurality of perforation members, and the scissors member prevents the perforation scraps from the central perforation member from accumulating at the detection position. The perforated waste storage device according to claim 2 or 3.   The inclined surface has a length communicating from below one piercing member to another below the central piercing member in another plurality of piercing members that can be mounted by replacing the plurality of piercing members. Item 5. The perforated waste storage device according to Item 4.   2. The perforated waste storage device according to claim 1, wherein a bottom raising portion for reducing the depth of the box member is formed on the bottom side of the box member corresponding to the detection position.   A light transmission window is arranged in the box member in correspondence with the detection position, and the full load of the perforated waste can be detected by detecting light shielding of the light incident on the box member through the light transmission window. The perforated waste storage device according to any one of claims 1 to 6. Drilling means having drilling members arranged at predetermined intervals;
Perforated waste storage means for storing the perforated waste by the perforated member stored in such a manner that it can be pulled out in the arrangement direction of the perforated members;
In a perforating apparatus comprising: detecting means that transmits light in a direction intersecting the direction of the predetermined interval to the perforated waste storage means and detects perforated waste;
A perforating device, wherein the perforated waste storage means is the perforated waste storage device according to any one of claims 1 to 7. Punching means for punching the sheet;
In a sheet processing apparatus comprising a sheet stacking member on which punched sheets are stacked,
The sheet processing apparatus according to claim 8, wherein the punching means is the punching apparatus according to claim 8. An image forming means for forming an image on a sheet;
A processing unit that processes the sheet on which the image is formed by the image forming unit;
An image forming apparatus comprising the sheet processing apparatus according to claim 9. The image forming apparatus according to claim 10, wherein the processing unit is commonly controlled by a control unit that controls the image forming unit.

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