JP2014136630A - Sheet punching device and image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent punch chips from scattering by closing an opening part of a dust box when the dust box is taken out of a device body.SOLUTION: A sheet punching device includes a punch and a die for holing a sheet; a dust box 58 which has an opening part 58c formed to receive punch chips from the punch and die; and a flapper 3 which can open and close the opening part of the dust box, and opens the opening part with the dust box mounted on the punch and die so as to flatten an upper portion of punch chips housed in the dust box and also closes the opening part 58c with the dust box removed from the punch and die, the flapper 3 preventing the punch chips from scattering.

Description

  The present invention relates to a sheet punching device that punches holes in a sheet, and an image forming apparatus including the sheet punching device in a main body of the apparatus.

  2. Description of the Related Art Conventionally, image forming apparatuses such as printers, FAX machines, copiers, and multifunction machines that form an image on a sheet may include a sheet punching device that forms holes in the sheet (Patent Document 1).

  The conventional sheet punching device detects a dust box 270 as a punch waste container for storing punch waste (perforation waste) W in FIG. 23, a flapper 261 provided on a rotating shaft 260 above the dust box, and a flapper 261. In many cases, a sensor 292 or the like is provided.

  As shown in FIGS. 23A and 23B, the flapper 261 is reciprocally oscillated by the reciprocating rotation of the rotating shaft 260, flattening the top of the pile of punch waste W, and the punch waste W is placed in the dust box 270. A large amount can be stored. A flag 263 for detecting the position of the flapper 261 is integrally formed with the flapper 261. A detection sensor 292 connected to a control unit (not shown) detects the flag 263 and detects the position of the flapper 261. The driving force of the flapper 261 differs between a state where there is no punch dust in the dust box 270 and a full state. A spring is provided in the drive unit so as to release the drive input of the flapper 261 when the full state is approached using the difference in drive force.

  When the dust box 270 is almost full, the swinging of the flapper 261 is delayed, the driving of the flapper is cut off, and finally, as shown in FIG. The flag 263 remains detected by the sensor 292. Thereby, the control unit determines that the dust box 270 is filled with punch scraps.

Japanese Patent Application No. 2005-154134

  However, in the conventional sheet punching device, if the user handles the dust box roughly after removing the dust box full of punch waste from the main body of the device and discarding the punch waste, the punch dust is scattered from the dust box. There are things to do.

  The present invention provides a sheet processing apparatus that closes an opening of a perforated waste container so that the perforated waste does not scatter when the perforated waste container is taken out from the apparatus main body, and an image forming apparatus including the sheet processing apparatus. There is to do.

  The sheet punching device of the present invention includes a punching means for making a hole in a sheet, and a punching waste container in which an opening for receiving punching scraps from the punching means is formed in a state of being detachably attached to the punching means, The opening of the perforated waste container can be opened and closed, and the upper part of the perforated waste stored in the perforated waste container is flattened by opening the opening while the perforated waste container is mounted on the perforating means, An opening / closing means for closing the opening in a state in which the perforated waste container is detached from the perforating means.

  In the sheet processing apparatus of the present invention, the perforated waste container is perforated by the opening / closing means for opening the opening and flattening the upper portion of the perforated waste accommodated in the perforated waste container with the perforated waste container mounted on the perforating means. The opening is closed while being removed from the means. For this reason, the sheet processing apparatus can prevent the perforated waste from being scattered from the opening until the user discards the perforated waste accumulated in the perforated waste container.

3 is a cross-sectional view of the image forming apparatus according to the embodiment of the present invention along the sheet conveying direction. It is sectional drawing along the sheet conveyance direction of the apparatus main body of the sheet processing apparatus of embodiment of this invention. It is a perspective view of the apparatus main body of a sheet processing apparatus. FIG. 6 is a cross-sectional view orthogonal to the sheet conveyance direction of the sheet punching device. In FIG. 4, it is AA arrow sectional drawing. It is a perspective view of a punch and die. It is a figure for piercing operation | movement description by a punch and die | dye. It is an external appearance perspective view when the dust box is attached to the frame of the sheet punching device. It is an enlarged view of the periphery of the handle part of a dust box. It is sectional drawing of the flame | frame and dust box of a sheet punching apparatus. In FIG. 10, it is a figure in case there are many punch scraps. It is an external appearance perspective view of the drive part which rotates a flapper. It is a figure for operation | movement explanation when rotation of the drive part which rotates a flapper is no longer transmitted to a flapper. It is sectional drawing of the thrust direction in FIG. 13 (A). It is sectional drawing of the thrust direction in FIG.13 (B). It is an external appearance perspective view of a dust box. It is sectional drawing along the longitudinal direction of a dust box. It is a figure of the state which a flapper can reciprocate freely. It is a figure in case a flapper is carrying out rotation regulation. It is a perspective view when a dust box is pulled out from a frame. It is the perspective view which turned over the dust box and frame of FIG. It is the perspective view which opened the bottom of the dust box with the bottom cover from the state of FIG. It is a figure for demonstrating operation | movement of the conventional sheet punching apparatus.

  Hereinafter, a sheet punching device 2 and an image forming apparatus 500 according to an embodiment of the present invention will be described with reference to the drawings.

(Image forming device)
FIG. 1 is a cross-sectional view of the image forming apparatus according to the embodiment of the present invention along the sheet conveying direction.

  The image forming apparatus 500 includes an apparatus main body 500A and a sheet processing apparatus 400. The sheet processing apparatus 400 includes an apparatus main body 400A and the sheet punching apparatus 2. However, the sheet punching device 2 of the present embodiment can be used alone.

  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 an image forming unit 200 that forms an image on a sheet. An automatic document feeder (ADF) 300 is pivotally attached to the upper part of the reader unit 120 so as to be opened and closed up and down. Note that the image forming apparatus 500 can read an original document placed on the reader unit 120 with the reader unit 120 to form an image on a sheet, and thus the automatic document feeder 300 is not necessarily required.

  The automatic document feeder 300 takes out the documents D one by one from the bundle of documents placed by the user and supplies them to the reader unit 120. The reader unit 120 reads an image of a document and converts it into an electrical signal or image data. The reader unit 120 performs a fixed reading in which a document placed on the contact glass 102 on the lower side of the automatic document feeder 300 is read by a scanner unit 104 that moves in a horizontal direction in FIG. It can be done. In addition, the reader unit 120 can stop the scanner unit 104 at the flow reading position in FIG. 1 and perform the flow reading for reading the document fed by the automatic document feeder 300. The scanner unit 104 includes an illumination lamp 103 and an image capturing mirror 105.

  When the reader unit 120 performs fixed reading, the scanner unit 104 moves rightward from the position of the scanning reading shown in FIG. Reflected light from the original is taken in from the mirror 105, passes through the mirrors 106 and 107, enters the lens 108, and forms an image on the CCD image sensor 109 that reads a line image.

  When the reader unit 120 performs the flow reading, the automatic document feeder 300 supplies the originals one by one from the document bundle placed by the user to the reader unit 120 and stops the originals at the flow reading position. It passes over the scanner unit 104 and is discharged to a discharge tray. Reflected light from the original is taken in from the mirror 105, passes through the mirrors 106 and 107, enters the lens 108, and forms an image on the CCD image sensor 109 that reads a line image.

  Regardless of whether reading is fixed reading or flow reading, the reflected light of the original is imaged on the CCD image sensor 109. The CCD image sensor 109 photoelectrically converts the reflected light and converts it into a line image signal. The image signal is converted into digital data and image data as necessary.

  The image forming unit 200 is a part that forms an electrophotographic image on the sheets S of various sizes taken out from the paper feed cassettes 204 and 205. The image forming unit 200 includes a laser scanner unit (exposure control unit) 201 that outputs and scans a laser beam to the photosensitive drum 202 in synchronization with the rotation of the rotating photosensitive drum 202. The laser scanner unit 201 irradiates the photosensitive drum 202 with a laser beam based on the image signal of the line image input from the reader unit 120, and forms a line image on a predetermined width of the surface of the photosensitive drum 202 by a scanning mirror (not shown). Write the latent image. 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, below the image forming unit 200, paper feed cassettes 204 and 205 storing sheets S of various sizes are arranged. The pickup roller 209 takes out the sheets S one by one from the paper feed cassette 204 and sends them to the nip between the photosensitive drum 202 and the transfer roller 206 in accordance with the position of the toner image on the photosensitive drum 202. Depending on the sheet size, the sheet S is also sent out from the other paper feed cassette 205 by the pickup roller 209.

  The transfer roller 206 transfers the toner image formed on the photosensitive drum 202 to the sheet, and rotates with the photosensitive drum 202 to convey the sheet to the fixing unit 207. The fixing unit 207 heats and presses the sheet to fix the toner image on the sheet.

  The apparatus main body 500A feeds the image-formed sheet S to the sheet processing apparatus 400 by the discharge roller pair 208.

  In the above image forming apparatus, the reader unit 120 reads an original and copies the original onto a sheet. However, the image forming apparatus converts the original into a sheet based on image information from an external image information device such as a fax machine or a personal computer. An image can also be formed.

(Sheet processing equipment)
FIG. 2 is a cross-sectional view of the apparatus main body 400A of the sheet processing apparatus 400 according to the embodiment of the present invention along the sheet conveyance direction. FIG. 3 is a perspective view of the apparatus main body 400A of the sheet processing apparatus 400. FIG.

  In FIG. 1, the sheet processing apparatus 400 is accommodated in a space SP formed in the side portion of the image forming apparatus main body 500A without protruding from the apparatus main body 500A. The sheet processing apparatus 400 includes an apparatus main body 400A and the sheet punching apparatus 2. The apparatus main body 400A includes a transport roller 405, an offset roller 407, a processing tray 410, and two-stage stack trays 421 and 422 that can be raised and lowered to an arbitrary height position. The sheet punching device 2 of the present embodiment can be used alone.

  The sheet processing apparatus performs sorting processing for sorting sheets into the stack trays 421 and 422, stapling processing for binding the sheets stacked on the processing tray 410 with the stapler 420, punching processing for punching a sheet bundle with the sheet punching device 2, and the like. To do.

  The sheet processing apparatus 400 conveys the sheet received from the entrance 401 by the conveyance roller 405 and delivers it to the offset roller 407. On the processing tray 410, sheets conveyed by the conveyance roller 405 are stacked. The offset roller 407 is brought into contact with and separated from the sheets stacked on the processing tray 410 by a swing guide 406 that rotates in the vertical direction by the rotation of the rotation shaft 511. Each time the sheet is discharged onto the processing tray 410, the offset roller 407 moves the sheet on the processing tray 410 to align the upstream end and the side end of the sheet into a sheet bundle.

  The sheet bundle discharge sensor 415 detects the sheet bundle on the processing tray 410. The stapler 420 staples the rear end portion of the sheet bundle. The stapled sheet bundle is pushed out by the sheet bundle discharge member 413 and is conveyed to the offset roller 407 and discharged to the stack trays 421 and 422. The stacking height of the sheet bundle discharged and stacked on the stack trays 421 and 422 is kept constant as the stack trays 421 and 422 descend according to the stacking height detected by the tray sensor 421A.

  Note that the sheets sequentially discharged to the processing tray 410 may be directly discharged to the stack tray 421 by the offset roller 407 without being bundled.

  The two stack trays 421 and 422 are individually supported so as to be movable up and down along the side surface of the sheet processing apparatus 400, and are moved up and down to an arbitrary height position by a lifting mechanism including an unillustrated motor, It comes to stop. The sheets discharged to the stack trays 421 and 422 slide down along the inclination of the stack trays 421 and 422, and the rear ends of the sheets are abutted against the side surfaces of the sheet processing apparatus 400 to be aligned at the rear ends. When the stack tray 422 loaded with the sheets moves up and down through the sheet discharge port 400b, the shutter 521 moves up and down so that the sheets stacked on the stack tray 422 do not slide into the sheet discharge port 400b. Block it.

(Sheet punching device)
In FIG. 4, the sheet punching apparatus 2 includes punch portions 42 and 43 and die holes 52 and 53 as punching means for punching holes in the sheet, and selectively punches two holes and three holes in the sheet. It is supposed to be. Further, the sheet punching device 2 can cope with the case where only two holes are made in the sheet and the case where only three holes are made according to the specification. In the two-hole specification, at the time of assembling, two punch portions indicated by reference numeral 42 are provided on the drive shaft 38, and two holes are formed at the rear end of the sheet by the two punch portions 42 and the two die holes 52. It is like that. In the three-hole specification, at the time of assembly, three punch portions indicated by reference numeral 43 are provided on the drive shaft 38, and the three punch portions 43 and the three die holes 53 provide three holes at the rear end of the sheet. It is designed to be opened.

  The frame 59 of the sheet punching device 2 is provided with a motor 33 that operates the punch. A motor gear 34 attached to the motor 33 transmits rotation to a drive gear 37 fixed to a drive shaft 38 via a gear train 35.

  4 and 5, a dust box 58 as a perforated waste container is disposed immediately below the drive shaft 38. The dust box is detachably mounted under the punch 47 and the die holes 52 and 53 of the punch portions 42 and 43, and the punch scraps of the sheet S punched out by the punch portions 42 and 43 and the die holes 52 and 53. (Perforated waste) W is received from the upper opening 58c and stored. The dust box 58 rotatably has a flapper 3 for breaking a mountain formed by the accumulation of punch waste W. The dust box 58 is detachably provided on the frame 59, and can be pulled out from the frame 59 to the front side of the image forming apparatus 500 in FIG.

  As shown in FIGS. 4, 6, and 7, the punch portion 42 (43) is fitted in an eccentric cam 44 fixed to the drive shaft 38, and is slidably rotated on the outer periphery of the eccentric cam 44. And a punch 47 connected to the cam holder 45 by a support shaft 46 so as to be tiltable. A perforating blade tip 47 a is formed at the tip of the punch 47.

  The tip of the punch 47 is inserted into a punch guide 48 fixed to a part of the frame 49 and is slidably positioned. The punch guide 48 is formed with a through hole 48a through which the punch 47 passes. The frame 49 is also formed with a through hole 49a through which the punch 47 passes.

  The portion of the frame 49 provided with the punch guide 48 is stretched between a front side plate (not shown) and a back side plate. A die 50 is also spanned between the front side plate and the rear side plate so as to face the frame 49 and be spaced apart from each other by a distance necessary for the sheet to pass therethrough. A gap between the frame 49 and the die 50 is a sheet conveyance path 51 for the sheet S to be punched. The die 50 is a member common to the two-hole specification and the three-hole specification, and includes a two-hole specification die hole 52 and a three-hole specification die hole 53 that can be engaged with the punching edge 47a of the punch 47. Is formed.

  The operation in the case of the two-hole specification will be described based on FIG. 7, but the same is true in the case of the three-hole specification.

  As the drive shaft 38 rotates, the punch 47 descends from the state before drilling (FIG. 7A), immediately before drilling (FIG. 7B), and during drilling (FIG. 7C). ) After completion of drilling (FIG. 7D), it rises and returns to the state before drilling (FIG. 7A).

  When the drive shaft 38 rotates from the state where the punch 47 is raised as shown in FIG. 7 (A), the eccentric cam 44 is rotated as shown in FIG. 7 (B), and the cam holder 45 fitted to the outer periphery is rotated. It rotates around the support shaft 46. Then, the punch 47 whose operation is restricted 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 52 is fitted, and a hole is made in the sheet. Even after drilling, the drive shaft 38 continues to rotate as shown in FIG. 7D, 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. 4, an encoder 41 that detects the reciprocating movement of the punch 47 is attached to one end of the drive shaft 38, and a sensor 54 is attached to the frame 49. The sensor 54 detects the reciprocating motion of the punch 47 with the encoder 41 and a control circuit (not shown).

  The sheet S on which the toner image is formed in the apparatus main body 500A is conveyed into the sheet punching apparatus 2 from the discharge roller pair 208 of the apparatus main body 500A. The sheet S passes through the sheet transport path 51 in the gap between the frame 49 and the die 50 shown in FIG. After the trailing edge of the sheet S is detected by a sheet detection sensor (not shown), the punching position on the trailing edge side of the sheet S is positioned at a position facing the punch 47, and the conveyance is stopped.

  When the sheet S stops, the punch 47 moves up and down with respect to the die 50 to make a hole in the sheet S. A dust box 58 is provided below the die 50. The punch scraps generated by the drilling pass through the opening 7 formed in the upper frame 8 (FIG. 9) of the frame 49, pass through the upper opening 58 c of the dust box 58, and fall into the dust box 58. When the sheet punching device 2 completes punching of the sheet S, the transport roller 405 resumes transport of the sheet S. 2 discharges the sheet S to the stack trays 421 and 422.

  Next, it will be described that the punch scraps of the sheet punching device 2 are full and the punch scraps are discarded.

  As shown in FIG. 4, punch waste W generated by punching holes in the sheet by the punch 47 and the die hole 52 (53) is accumulated in the dust box 58 below. At this time, when the punch scrap has a two-hole specification, two piles of punch scrap W are formed as shown in FIG. 4, and when the punch scrap has a three-hole specification, three punch scrap peaks are formed. The flapper 3 is rotatably provided in the dust box 58 in order to break up the piles of punch scraps so that a large amount of punch scraps can be accommodated in the dust box 58.

  As shown in FIGS. 8, 12, and 13, the flapper 3 is connected to the rotation center shaft 3a of the flapper 3 from the drive motor 4 as drive means, through the drive transmission gears 5 and 6, and the input helical gear 11. It rotates by the rotational force transmitted to the helical gear 3c provided at the end. As shown in FIGS. 12 and 13, an L-shaped flag 3 b is provided at the end of the rotation center shaft 3 a of the flapper 3. A sensor 12 is fixedly provided on the apparatus side. When the sensor 12 detects the flag 3b, the drive motor 4 rotates forward and backward. By the forward / reverse rotation of the drive motor 4, the flapper 3 reciprocally rotates in the directions of arrows a and b shown in FIG. 10 to sweep away the punch scraps W, break up the piles of punch scraps, and flatten the punch scraps.

  However, as shown in FIG. 11, as the amount of punch waste increases, the punch waste becomes resistance. This resistance increases as the amount of punch waste W deposited increases, and initially only slows the reciprocating rotation of the wiping operation of the flapper 3. However, when the accumulation amount of punch scraps W increases and the resistance increases, the flapper 3 hardly reciprocates. Since the input helical gear 11 meshes with the helical gear 3c provided in the flapper 3, when the flapper 3 is difficult to reciprocate, the arrow is generated by the component force generated by the inclination of the tooth with the helical gear 3c. Move in the c direction. The input helical gear 11 moves from the position shown in FIGS. 13A and 14 to the position shown in FIGS. 13B and 15 in the direction of the arrow c, and the meshing with the helical gear 3c is performed. Come off. The movement of the input helical gear 3c is caused by the engagement between the projecting piece 15 protruding from the input helical gear 3c along the thrust direction and the groove 16 along the thrust direction rotating on the drive transmission gear 6 side. Allowed by. At this time, the input helical gear 11 temporarily moves in the direction of the arrow c against the compression spring 14 shown in FIGS. 14 and 15, but is pushed back by the compression spring 14 and meshes with the helical gear 3c again. To do. However, the input helical gear 11 receives the force in the direction of the arrow c again and disengages from the helical gear 3c. The compression spring 14 is loosely fitted to the fixed shaft 17 and is received by a retaining ring 18 attached to the fixed shaft 17 via a pulley 19. The pulley 19 is loosely fitted on the fixed shaft 17.

  In this manner, when the input helical gear 11 repeats the contact / separation operation with respect to the helical gear 3c, the rotational force of the drive motor 4 to the flapper 3 is interrupted each time the sensor 12 is repeated. The timing for detecting the flag 3b is shifted. Due to this difference in sensor detection timing, a warning is displayed on the operation unit of the image forming apparatus that punch dust W is full in the dust box 58, and the operations of the sheet punching apparatus 2, the apparatus main body 400A, and the like are stopped.

  The dust box 58 filled with punch scraps is pulled leftward by the user in FIG. The flapper 3 is supported in the dust box 58 so as to be rotatable about the rotation center shaft 3a. Further, the flapper 3 is rotationally biased by a spring 60 (FIG. 4) as a biasing member in the direction of the arrow d in FIGS. 10 and 18. The spring 60 is provided between the flapper 3 and the dust box 58. When the dust box 58 is pulled out from the frame 59, the flapper 3 is rotated by the rotation transmission path with the input helical gear 11 being cut off, and is rotated by the spring 60 to the stopper portion 58d of the dust box 58. At the end, the rotation is stopped. Further, as shown in FIG. 19, the flapper 3 is also restricted from rotating in the direction of the arrow a by a lock member 10 which will be described later and protrudes from the dust box 58. As a result, as shown in FIG. 19, the flapper 3 as the opening / closing member is restricted in rotation by the stopper portion 58 d and the lock member 10, and closes the upper opening 58 c of the dust box 58.

  Next, a case where the dust box 58 is attached to the frame 59 will be described.

  As shown in FIGS. 8 and 20, the dust box 58 is detachable from the frame 59 in the directions of arrows e and f in FIG. 20. As shown in FIGS. 9 to 11, 16, 18, 19, and 20, the lock member 10 is provided on the outer wall of the dust box 58. The lock member 10 has elasticity in a direction approaching the dust box 58, and when the dust box 58 is pulled out from the frame 59, the stopper portion 10 a protrudes from the through hole 61 of the dust box 58 into the dust box 58. As shown in FIGS. 9, 18, and 19, the frame 59 is provided with a lock release member 13. When the dust box 58 is attached to the frame 59, the unlocking member 13 enters between the dust box 58 and the lock member 10 and pulls out the stopper portion 10a from the dust box 58 against the elasticity of the lock member 10. It has become. As shown in FIG. 18, the drawn-out stopper portion 10 a does not protrude into the dust box 58 and does not restrict the rotation of the flapper 3. As a result, the flapper 3 can perform a wiping operation.

  Since the lock members 10 are provided at two locations in the longitudinal direction, the lock release members 13 are also provided at two locations in the longitudinal direction, and arranged at positions shifted vertically as shown in FIG. 18 in order to avoid interference during attachment / detachment. Has been.

(Dust box bottom cover)
Next, the configuration of the bottom cover 9 of the dust box will be described based on FIGS. 4, 5, 9, 10, 16, 17, 21, 22, and the like. In FIG. 4, two bottom lids 9 are shown, but the right bottom lid 9 in FIG. 4 shows the position when the bottom of the dust box 58 is opened. , In the left position.

  At the lower part of the dust box 58, a bottom lid 9 is provided that opens and closes by sliding a lower opening 58f (FIG. 22) of the dust box 58 along the longitudinal direction (arrow e, f direction) of the dust box 58. The bottom lid 9 is locked to the dust box 58 by engagement between the bottom lid lock portion 9 a of the bottom lid 9 and the box lock portion 58 e of the dust box 58. As shown in FIG. 17, when the bottom lid lock portion 9a is locked to the left box lock portion 58e, the bottom lid 9 closes the lower opening 58f of the dust box 58 as shown in FIG. Further, when the bottom lid lock portion 9a is locked to the right-side box lock portion 58e shown in FIG. 17, the bottom lid 9 opens the lower opening 58f of the dust box 58 as shown in FIG.

  On the sides of the lower portion of the dust box 58 in the longitudinal direction, rail portions 58b project outward. On both sides of the bottom lid 9 in the longitudinal direction, guide portions 9b that are bent so as to wrap the rail portion 58b are formed. The bottom lid 9 is slidably guided along the longitudinal direction (arrow e, f direction) of the dust box 58 by guiding the rail portion 58b and the guide portion 9b.

  When the punch scraps W in the dust box 58 are full, it is displayed on the display unit (not shown) of the apparatus main body 500A that it is full. Then, the user opens a cover (not shown) of the sheet punching device 2, grasps the handle 58a of the dust box 58 of FIG. 9, and pulls out the dust box from the frame 59 in the direction of arrow f as shown in FIG. At this time, as shown in FIG. 17, the bottom lid 9 has the bottom lid lock portion 9a locked to the left box lock portion 58e and closes the lower opening 58f of the dust box 58.

  When the dust box 58 is pulled out from the frame 59 in the direction of the arrow f, the helical gear 3c in FIG. 12 is separated from the input helical gear 11 and the driving connection with the driving motor 4 is released. Then, the flapper 3 becomes rotatable, and is rotated by the spring 60 (FIG. 4) in the direction of the arrow d as shown in FIGS. 18 and 19, and is received by the stopper portion 58d protruding in the dust box 58. It is done.

  On the other hand, by pulling out the dust box 58 from the frame 59, the unlocking member 13 comes out of the state shown in FIG. 18 from between the dust box 58 and the lock member 10. For this reason, as shown in FIG. 19, the lock member 10 is in close contact with the dust box 58 by its own elasticity, and causes the stopper portion 10 a to protrude into the dust box 58 from the through hole 61. The flapper 3 is restricted from rotating in the direction of arrow a by the protrusion of the stopper portion 10a.

  As a result, as shown in FIG. 19, the flapper 3 is restricted from rotating in the directions of the arrows d and a by the stopper portion 58 d serving as an erroneous opening prevention means and the lock member 10, and closes the upper opening 58 c of the dust box 58. It becomes a state.

  When the dust box 58 full of punch debris is pulled out of the frame 59, there is a risk that the punch debris overflows from the upper opening 58c of the dust box 58 due to the tilt of the dust box 58, the air flow, static electricity charged to the punch debris, and the like. is there. However, since the flapper 3 closes the upper opening 58c of the dust box 58, it is possible to prevent the punch waste W from scattering from the inside of the dust box 58 to the outside.

  Thereafter, as shown in FIGS. 21 and 22, the bottom cover 9 is moved in the direction of arrow e in the drawing with the rail portion 58 b and the guide portion 9 b as a guide. Then, the bottom lid lock portion 9a is disengaged from the left box lock portion 58e in FIG. 17 and engages with the right box lock portion 58e. As a result, the lower opening 58f of the dust box 58 is opened, and the punch waste W can be discarded. When the dust box 58 in which punch scraps are discarded is mounted on the frame 59 in a state where the bottom lid 9 is moved in the direction f and the lower opening 58f is closed, the sheet punching device can perform a punching operation.

  In order to prevent the bottom lid 9 from being forgotten to be closed, as shown in FIG. 17, a return portion 59 a protruding into the main body frame is provided at the bottom of the main body frame 59. As the dust box 58 is inserted into the frame 59, the bottom lid 9 that has been forgotten to close comes into contact with the return portion 59a. Then, the bottom cover 9 is prevented from moving integrally with the dust box 58, but only the dust box 58 is moved. As a result, the bottom lid 9 closes the lower opening 58f of the dust box 58.

  In the above configuration, the flapper 3 as the opening / closing member, the spring 60 (FIG. 4) as the biasing member, the drive motor 4 (FIG. 12) as the driving means, the stopper portion 58d as the erroneous opening prevention means, and the lock member 10 (FIG. 19) constitutes an opening / closing means.

  2: sheet punching device, 3: flapper (opening / closing member, opening / closing means), 3a: rotation center shaft, 3c: helical gear, 4: motor (driving means, opening / closing means), 7: opening, 9: bottom lid , 9a: bottom cover lock portion, 9b: guide portion, 10: lock member (misopening prevention means, opening / closing means), 10a: stopper portion, 11: flapper drive input gear, 13: lock release member, 33: motor (punch Drive), 42, 43: punch part, 47: punch (piercing member), 52, 53: die hole (piercing member), 58: dust box (perforation waste container), 58c: upper opening part (opening part), 58d: Stopper part (misopening prevention means, opening / closing means), 58e: box lock part, 59: frame, 58f: lower opening, 60: spring (biasing member, opening / closing means), 200: image forming part, 400: sheet processing Device, 400A Sheet processing apparatus main body, 500: image forming apparatus, 500A: image forming apparatus main body, a, d: flapper rotation direction, e: dust box attaching / detaching direction, e, f: bottom lid moving direction, S: sheet , W: punch scraps (perforated scraps).

Claims (4)

Punching means for drilling holes in the sheet;
In a state in which the punching means is detachably mounted, a punching waste container in which an opening for receiving punching waste from the punching means is formed;
The opening of the perforated waste container can be opened and closed, and the upper part of the perforated waste stored in the perforated waste container is flattened by opening the opening while the perforated waste container is mounted on the perforating means, Opening and closing means for closing the opening in a state where the perforated waste container is removed from the perforating means,
A sheet punching device characterized by that. The opening / closing means includes
An opening / closing member provided on the perforated waste container so that the opening can be opened and closed, and flattening an upper part of the perforated waste accommodated in the perforated waste container;
A biasing member that biases the opening and closing member in a state in which the opening is closed;
With the perforated waste container mounted on the perforating means, the opening / closing member opens the opening against the biasing member, and the upper part of the perforated waste accommodated in the perforated waste container is flattened. Driving means for causing
The sheet punching device according to claim 1, wherein the sheet punching device is provided. In the state in which the perforated waste container is removed from the perforating means, the opening / closing member includes an erroneous opening preventing means for preventing the opening member from opening the opening against the biasing member.
The sheet punching device according to claim 2, wherein the sheet punching device is provided. An image forming unit for forming an image on a sheet;
A sheet punching device that punches holes in a sheet on which an image is formed in the image forming unit,
The sheet punching device is the sheet punching device according to any one of claims 1 to 3.
An image forming apparatus.

Images