JP2005035789A - Punching device and post-processing device with the same being mounted - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform a process for releasing paper jamming by restraining excessive bending of paper in a punching process to make a device compact. <P>SOLUTION: This punching device is provided with a horizontal guide plate 41 with an upper face laid along a carrying direction of the paper P2, a rotating member 50 rotatably pivotally supported around a mounting pivot 51 above the horizontal guide plate 41, a gate member 64 variable in posture between a passage blocking posture for blocking carriage of the paper P2 and a passage allowing posture in which blocking is released, and a punching part 60 operating when the gate member is in a state of being set for the passage blocking posture. The mounting pivot 51 is provided at a position for substantially facing a rear end edge of the horizontal guide plate 41, dimension of the rotating member 50 is set so that a distance between the mounting pivot 51 and a front end part can be longer than that between the mounting pivot 51 and a rear end part, and a lower bending accepting space 44 for absorbing the bending of the paper P2 is formed at a position in the rear of the rear end part of the horizontal guide plate 41. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a punching device used for sequentially punching a binding hole in a predetermined sheet and a post-processing device to which the device is applied.

  Conventionally, a punching device 90 as shown in FIG. 7 for punching a predetermined sheet is known. 7A shows a state in which the forward movement of the fed paper P is blocked by the gate member 95 set in the conveyance blocking posture, and FIG. 9B shows that the deflection of the paper P is accepted. Each state received in the space 941 is shown.

  As shown in FIG. 7, the conventional punching device 90 has a binding hole (punch hole) for the paper P fed by the driving of a pair of conveying rollers 101 provided at a paper discharge port of an upstream device 100 such as an image forming apparatus. The guide plate 91 provided on the downstream side (left side in FIG. 7) of the conveying roller pair 101, the inclined plate 94 provided on the guide plate 91, and the inclined plate 94 The apparatus main body 901 has a configuration in which a gate member 95 provided at a position above the guide plate 91 on the downstream side of this and a punch machine 96 provided at the same position in the transport direction with respect to the gate member 95 are provided. is doing.

  The inclined plate 94 is inclined upward toward the upstream side (the right side in FIG. 7), and as a result, as shown in FIG. 7 (B), the gate is interposed between the inclined plate 94 and the guide plate 91. A bending receiving space 941 that can receive a bent portion of the sheet P in a state where the advancement is blocked by the member 95 is formed.

  The gate member 95 can be changed in posture between a conveyance preventing posture for preventing the conveyance of the paper P and a conveyance allowable posture for allowing conveyance by rotating forward and backward around the gate shaft 952. The sheet P is prevented from advancing when the leading edge of the sheet P comes into contact with the stopper 951 of the gate member 95 in a state where the gate member 95 is set in the conveyance blocking posture, while the gate member 95 is in the conveyance allowable posture. By setting the posture, the stop of the front end portion with respect to the stopper 951 is eliminated, and thereby the forward movement can be performed by driving the conveyance roller pair 101.

  The punch machine 96 has a punch rod 961 having a punch blade 962 at the lower end, and the punch rod 961 is lowered while the leading end of the paper P is in contact with the stopper 951 so that a punch hole is formed in the paper P. It is designed to be perforated.

  A feeding roller pair 98 is provided between the inclined plate 94 and the gate member 95, and the presence of the feeding roller pair 98 ensures the conveyance of the paper P from the bending receiving space 941 to the punch machine 96. To be done.

  According to the punching device 90 configured in this way, the paper P sent to the punching device 90 by driving the conveying roller pair 101 first advances through between the guide plate 91 and the inclined plate 94, 7 (a), the leading end is brought into contact with the stopper 951 of the gate member 95.

  In this state, the punch rod 961 is lowered by driving the punch machine 96, and punch holes are punched in the paper P. Until the punch rod 961 is raised to the original position, the gate member 95 is in the conveyance blocking posture. Therefore, a forward force is applied to the paper P by continuing the driving of the transport roller pair 101. Accordingly, the portion of the paper P positioned in the bending receiving space 941 is bent in a state where it bulges upward as shown in FIG.

  Then, when the punch rod 961 is returned to the original upper position, the posture of the gate member 95 is changed to the conveyance allowable posture, whereby the sheet P is promptly moved toward the downstream side in combination with the driving of the conveyance roller pair 101. It is conveyed to.

Incidentally, as for such a perforating apparatus, for example, one disclosed in Patent Document 1 is known.
JP-A-11-263528

  By the way, in the conventional punching device 90 as described above, since the upper side of the bending receiving space 941 for receiving the upwardly bent portion of the paper P is open, the paper P is large. When bent, the apparatus main body 901 containing the punching device 90 becomes bulky so as to receive the bent portion of the paper P protruding upward from the upstream end of the bending receiving space 941. There is a problem that hinders downsizing.

  Further, in the conventional punching device 90, when a paper jam occurs in the bending receiving space 941, as shown in FIG. 7B, a maintenance lid provided on the top plate 902 of the device main body 901. Inserting a hand into the apparatus main body 901 from the opening 904 formed by opening 903 removes the jammed paper P.

  However, in the apparatus main body 901, related members (not shown) are arranged to form a very narrow space, and the inclined plate 94 is obstructed, and the hand is bent and inserted into the receiving space 941 sufficiently. There is also a problem that it is difficult to remove the jammed paper P.

  The present invention has been made to solve the above-described problems, and by suppressing excessive bending of the paper in the punching process, it is possible to contribute to the downsizing of the apparatus, and the paper. It is an object of the present invention to provide a perforation apparatus that can easily perform clogging elimination processing and an image forming apparatus equipped with this apparatus.

  The punching device according to claim 1 is located on the upstream side of the punch portion that temporarily stops the conveyance with respect to the leading edge of the paper being conveyed and performs punching at a predetermined position on the leading edge side during that time. In the perforating apparatus including a conveyance guide unit that guides conveyance of the sheet to the punch unit, the conveyance guide unit includes a first guide plate and a second guide plate that form a sheet conveyance path between opposing surfaces. A loop space part that allows the paper to bend and deformed, and further includes a loop formation auxiliary member that can be moved in and out of the loop space part. A paper passing posture for passing the paper conveyed while projecting into the loop space, and the paper that is conveyed while sunk from the loop space bends in a loop toward the loop space with the leading end stopped. Allow And it is characterized in that there is a posture can be changed to a sheet bending posture.

  By adopting such a configuration, the paper supplied to the punching device is continuously transported in a state where the leading end is stopped for punching operation in the punching unit, so that the first and second papers are conveyed. The leading edge of the paper stops because the bending of the paper due to the fact that the leading edge is stopped is absorbed by the bending into the loop space that allows the bending deformation of the paper formed between the guide plates. This prevents inconveniences such as paper jamming in the paper transport path.

  Then, the paper introduced into the loop space is conveyed through the loop forming auxiliary member that is immersed in the loop space and set to the paper passage posture in a state where the front end is not stopped, while the front end is stopped. As a result, the loop forming auxiliary member is bent toward the loop space, and the posture of the loop forming auxiliary member is set to the sheet bending posture by being pressed by the bending. At this time, since the bent portion of the paper is covered with the loop formation assisting member set to the bent posture of the paper, there is a disadvantage that the bent portion of the paper protrudes outside the loop space portion. It is avoided and contributes to the downsizing of the device main body with the drilling device.

  The punching device according to claim 2 is the punching device according to claim 1, wherein the loop space portion transports the paper in the direction perpendicular to the paper transporting direction, either the first guide plate or the second guide plate. It is formed by a plate member that expands the path.

  By adopting such a configuration, the paper introduced into the loop space is easily bent by being guided by the plate member in a state where the leading end is stopped.

  The punching device according to claim 3 is the punching device according to claim 1, wherein a part of the first guide plate is bent toward the first guide plate in a direction away from the second guide plate. A first loop guide portion that forms a first loop space that opens toward the upstream side is provided, and a portion of the second guide plate is directed away from the first guide plate on the second guide plate. A second loop guide portion that forms a second loop space that is opened toward the upstream side further upstream of the first loop guide portion by being bent to form the loop space portion, and the first loop guide A loop forming auxiliary member that is rotatable around a support shaft parallel to the width direction of the paper transport path is provided between the first loop guide portion and the second loop guide portion. Can pass Between a parallel posture parallel to the paper transport path and an inclined posture in which the transported paper is rotated around the support shaft and tilted by bending in a loop toward the first loop space when the leading edge stops. The support shaft is pivotally supported at a substantially intermediate position so that the posture can be changed.

  By adopting such a configuration, when the leading end of the paper supplied to the punching device is stopped for punching operation in the punching section, the transport of the paper is continued, whereby the first and second guides are provided. Since the bending of the paper due to the fact that the leading edge has been stopped is absorbed by bending toward the first and second loop guide portions formed by the plate, the leading edge of the paper is stopped. Inconveniences such as paper jamming in the paper transport path are prevented. In particular, the one bent in the first loop space rotates the loop forming auxiliary member around the support shaft. However, since the bending of the paper is absorbed also in the second loop guide portion, the first loop is correspondingly increased. The amount of bending of the paper in the space is reduced, so that the amount of rotation of the loop forming auxiliary member is reduced as compared with the conventional one in which the second loop guide portion is not provided. Therefore, it is possible to reduce the capacity of the device main body that accommodates the perforation apparatus, and contribute to the compactness of the device main body.

  Further, since the loop formation assisting member is pivotally supported by the support shaft at an intermediate position in the sheet conveyance direction, the loop formation assisting member rotates around the support shaft due to the bending of the sheet in the first loop space, As a result, the rear portion of the support shaft of the loop forming auxiliary member forcibly deflects the paper and guides it to the second loop guide portion, so that the portion of the paper positioned at the second loop guide portion bends smoothly and reliably to the first. This contributes to reducing the amount of bending of the paper in the loop space.

The punching device according to claim 4 is the punching device according to any one of claims 1 to 3, wherein at least one of the first guide plate or the second guide plate is parallel to the width direction of the sheet conveyance path. And a sheet conveyance path constituted by the first guide plate and the second guide plate can be opened to the outside by the rotation operation. By adopting, when a paper jam occurs in the paper transport path, the loop space is opened to the outside by rotating at least one of the first guide plate or the second guide plate around the opening support shaft. In this state, the jammed paper is easily removed by inserting a hand into the loop space and performing a paper jam clearing operation in the paper conveyance path.

According to a fifth aspect of the present invention, in the perforating apparatus according to the fourth aspect, the first guide plate and the second guide plate are arranged in a vertical relationship, and the first guide plate is used to open the sheet conveyance path to the outside. The first guide plate unit includes a configuration in which the first guide plate unit is rotatably supported, and the first guide plate unit includes a plate member that extends the paper conveyance path in a direction orthogonal to the paper conveyance direction. A first guide plate, a frame member that holds the first guide plate, and a loop formation auxiliary member that can be moved into and out of the loop space through a slit provided in the first guide plate. The first guide plate unit is configured to be opened by rotatably supporting the opening by the opening support shaft. By adopting such a configuration, When the paper jam occurs, the first guide plate unit rotates about the opening support shaft with the loop auxiliary member by rotating the frame member about the opening support shaft. Since this causes the loop space portion to be opened to the outside, the jammed paper can be easily removed by inserting a hand into the loop space portion and performing a paper jam clearing operation in the paper transport path in this state. It is.

  As described above, the first guide plate unit includes a first guide plate made of a plate member, a frame member that holds the first guide plate, and a loop formation assisting member that can be moved into and out of the loop space. With this configuration, the loop space portion is entirely opened by a one-touch operation of rotating the first guide plate unit about the opening support shaft, thereby greatly improving the workability of the paper jam clearing operation.

  The post-processing apparatus according to claim 6 is a post-processing apparatus that is connected to the downstream side of the image forming apparatus configured to transfer the read document image onto the paper, and that performs post-processing on the paper on which the transfer processing has been completed. Thus, the perforation apparatus according to any one of claims 1 to 5 is applied.

  By adopting such a configuration, the post-processing apparatus has the function of the punching apparatus according to claims 1 to 5.

  According to the punching device of the first aspect, the paper fed toward the punching device is continuously transported in the state where the leading end is stopped for the punching operation in the punching section, so that the first And the paper formed between the second guide plates bends in a loop toward the loop space that allows the deformation of the paper, thereby absorbing the paper deflection due to the stop of the leading edge. By stopping the leading edge, it is possible to prevent the occurrence of inconvenience that the paper is jammed in the paper conveyance path.

  Then, the paper introduced into the loop space is conveyed through the loop forming auxiliary member that is immersed in the loop space and set to the paper passage posture in a state where the front end is not stopped, while the front end is stopped. As a result, the loop forming auxiliary member can be set to a sheet bending posture by the bending. The bent portion of the paper is covered with the loop forming auxiliary member set in the bent posture of the paper, so that the inconvenience that the bent portion of the paper protrudes outside the loop space portion is avoided. Therefore, it is possible to contribute to the downsizing of the apparatus main body in which the perforation apparatus is installed.

  3. The punching device according to claim 2, wherein the loop space portion is a plate member that expands the paper transport path in a direction orthogonal to the paper transport direction by either the first guide plate or the second guide plate. Therefore, the paper introduced into the loop space can be easily bent by being guided by the plate member in a state where the leading end is stopped.

  According to the punching device of the third aspect, when the leading edge of the paper supplied to the punching device is stopped for punching operation in the punching section, the conveyance of the paper is continued. Since the bending of the paper due to the fact that the leading edge is stopped is absorbed by bending toward and into the first and second loop guide portions formed by the second guide plate, the leading edge of the paper is stopped. This prevents inconveniences such as paper jamming in the paper transport path. In particular, the one bent in the first loop space rotates the loop forming auxiliary member around the support shaft. However, since the bending of the paper is absorbed also in the second loop guide portion, the first loop is correspondingly increased. The amount of bending of the paper in the space is reduced, so that the amount of rotation of the loop forming auxiliary member is reduced as compared with the conventional one in which the second loop guide portion is not provided. Therefore, it is possible to reduce the capacity of the device main body that accommodates the perforating apparatus, and contribute to the compactness of the device main body.

  Further, since the loop formation assisting member is pivotally supported by the support shaft at an intermediate position in the sheet conveyance direction, the loop formation assisting member rotates around the support shaft due to the bending of the sheet in the first loop space, As a result, the rear portion of the support shaft of the loop forming auxiliary member forcibly deflects the paper and guides it to the second loop guide portion, so that the portion of the paper positioned at the second loop guide portion bends smoothly and reliably to the first. This can contribute to reducing the amount of bending of the paper in the loop space.

  According to the punching device of claim 4, at least one of the first guide plate or the second guide plate is rotatably supported by an opening support shaft parallel to the width direction of the sheet conveyance path, and the first guide plate Since the paper conveyance path constituted by the second guide plate can be opened to the outside by the rotation operation, when a paper jam occurs such that the paper is jammed in the paper conveyance path, the first guide plate or the second guide plate By rotating at least one of the two guide plates around the opening support shaft, the loop space portion is opened to the outside, and in this state, by inserting a hand into the loop space portion and performing a paper jam clearing operation in the paper transport path, The jammed paper can be easily removed.

  According to the punching device of claim 5, when a paper jam occurs such that the paper is jammed in the paper transport path, the first guide plate unit rotates the frame member around the opening support shaft to assist the loop. It rotates around the opening support shaft with the member, and this causes the loop space part to be opened to the outside, so in this state the hand is inserted into the loop space part and paper jam clearing work in the paper transport path By performing the above, the jammed paper can be easily removed.

  As described above, the first guide plate unit includes a first guide plate made of a plate member, a frame member that holds the first guide plate, and a loop formation assisting member that can be moved into and out of the loop space. By configuring, the loop space portion is entirely opened by a one-touch operation of rotating the first guide plate unit around the opening support shaft, thereby greatly improving the workability of the paper jam clearing operation. Can do.

  According to the post-processing apparatus of the sixth aspect, the post-processing apparatus connected to the image forming apparatus can have the function of the punching apparatus according to the first to fifth aspects.

  FIG. 1 is a side sectional view showing an embodiment of an image forming apparatus provided with a paper punching device according to the present invention. As shown in FIG. 1, the image forming apparatus 10 forms an image based on the original image of the original P1, and transfers the image to the paper P2, and the image forming unit 20 transfers the image. And a post-processing unit 30 that performs post-processing on the sheet P2. And in this embodiment, the perforation apparatus which concerns on this invention is provided in the post-processing part 30 side.

  First, the image forming unit 20 will be described. The image forming unit 20 includes a document loading unit 21 for loading the formed document P 1, an image reading unit 22 for reading a document image from the document P 1 loaded in the document loading unit 21, and the image reading unit 22. A transfer unit 23 that transfers the read original image as a toner image onto the paper P2, a fixing unit 24 that fixes the toner image of the paper transferred by the transfer unit 23, and a paper that is fed toward the transfer unit 23 The sheet storage unit 25 that stores P2 is formed by being mounted on the image forming unit casing 11 having a box shape.

  The image reading unit 22, the transfer unit 23, the fixing unit 24, and the paper storage unit 25 are housed in this order from the top in the image forming unit casing 11, whereas the document loading unit 21 performs image formation. The image forming unit housing 11 is formed separately from the image forming unit housing 11 on the upper surface of the image forming unit housing 11.

  The document loading unit 21 includes a cover lid 211 that can be opened and closed, a document tray 212 that is formed on the recessed upper surface of the cover lid 211, and a bundle of documents P1 loaded on the document tray 212. A document feeding mechanism 213 is provided that feeds the images one by one to the image reading unit 22 and makes the document image face the upper surface of the image reading unit 22.

  The image reading unit 22 includes a contact glass 221 that is disposed on the upper surface thereof so that the image surface of the original P1 is in close contact with the image reading mechanism 222 that scans and reads an original image that is in close contact with the contact glass 221. In the present embodiment, as the image reading mechanism 222, a moving light source 223 that irradiates light to the document image while moving, and reflected light of the light from the moving light source 223 on the document image is reflected along a predetermined optical path. And a plurality of mirrors 225 and an optical system member 224 including a lens member 226 that converges light in the optical path.

  The transfer unit 23 includes a photosensitive drum 231 on which an electrostatic image and a toner image are sequentially formed on the peripheral surface, and a transfer belt 232 that feeds paper P2 to the peripheral surface of the photosensitive drum 231. . The circumferential surface of the photosensitive drum 231 rotating around the axis is irradiated with scanning light obtained by scanning the document image of the document P1 and passing through the optical system member 224. The electric images are sequentially formed, and the toner image is formed on the peripheral surface of the photosensitive drum 231 by supplying toner from the developing unit 233 to the electrostatic image on the downstream side of the scanning light irradiation position. The image is transferred onto the paper P2 fed by the transfer belt 232.

  The fixing unit 24 performs a fixing process on the transfer image of the paper P2 on which the image is transferred by the photosensitive drum 231 in the transfer unit 23, and has a fixing roller in which a heating member such as an energization heating element is mounted. 241 and a pressure roller 242 disposed at the lower portion so as to face the fixing roller 241. Then, the sheet P 2 led out from the transfer unit 23 as the transfer belt 232 is driven is fed between the fixing roller 241 and the pressure roller 242, and is heated by the fixing roller 241 so that a toner image is obtained. Is fixed to the paper P2. The paper P <b> 2 that has passed through the fixing unit 24 is carried out toward the post-processing unit 30 through the paper discharge port 13 through the pair of carry-out rollers 243 provided at the most downstream end.

  The paper storage unit 25 includes a plurality of stages of paper cassettes 251 that are detachably installed in the image forming unit housing 11. Each paper cassette 251 is provided with a pickup roller 252 and a paper feed roller 253 at one end (the right end in the example shown in FIG. 1), and is loaded into the paper cassette 251 by the drive rotation of the pickup roller 252. The uppermost one of the bundle of sheets P2 is sequentially fed out and led out toward the conveyance path 12 via the sheet feeding roller 253.

  Then, the paper P2 led out from the paper cassette 251 via the pickup roller 252 and the paper feed roller 253 is conveyed by the transfer belt 232, and the toner image on the peripheral surface of the photosensitive drum 231 is transferred to the paper P2, and the fixing unit 24 continues. After the heat fixing process is performed by the fixing roller 241, it passes through the pair of carry-out rollers 243 and is discharged to the outside from the paper discharge port of the image forming unit casing 11.

  In the present embodiment, a reversing unit 26 is interposed between the fixing unit 24 and the paper storage unit 25. The reversing unit 26 is used when the paper P2 is subjected to the double-sided printing process. The paper P2 for which the fixing process on the first surface has been completed by the fixing unit 24 is once introduced into the reversing unit 26, where After the reverse process (reversing process) is performed, the sheet is returned to the transfer unit 23, and after the transfer process of the second surface in the transfer unit 23 and the fixing process in the fixing unit 24 are performed, the paper is discharged through the paper discharge port 13. It is sent out to the post-processing unit 30.

  Next, the post-processing unit 30 will be described with reference to FIG. The post-processing unit 30 includes a paper carry-in unit 31, a punch unit 60, a branching unit 33, and an intermediate tray unit 34 in a post-processing unit housing 15 having a box shape similar to that of the image forming unit housing 11. In addition, the sheet discharge unit 35 and the sheet folding unit 36 are set.

  The paper carry-in unit 31 is a part that receives the transfer-processed black paper P2 discharged from the paper discharge port 13 via the pair of carry-out rollers 243 of the image forming unit 20 into the post-processing unit 30, and is composed of an inclined plate. A sheet receiving chute (second guide plate) 40 and a rotating member (loop forming auxiliary member) 50 provided immediately above the sheet receiving chute 40 are provided.

  The paper receiving chute 40 is formed in the upper right part of the post-processing unit casing 15 in the upper right part in FIG. 1 toward the paper discharge port 13, and the paper P 2 discharged from the paper discharge port 13 is the paper receiving chute 40. While being guided by the upper surface of the chute 40, it slides toward the upper left.

  The rotating member 50 deflects the sheet P2 in a state in which the leading end of the sheet P2 being fed to the post-processing unit 30 by driving the carry-out roller pair 243 is stopped for punching processing in the punch unit 60. In addition to receiving, the paper P2 that has been bent when the stop at the punch unit 60 is released is restored to the original direction and quickly sent out in the traveling direction. The rotating member 50 is made of a long plate material in the width direction of the paper conveyance path (a direction orthogonal to the paper surface of FIG. 1), and an erection shaft (between the side plates 16 of the post-processing unit casing 15). (Support shaft) 51 is pivotally supported so as to be freely rotatable.

  The punch section 60 is for punching a punching hole for binding at the edge of the front end side (left side in FIG. 1) of the sheet P2 fed from the image forming section 20 through the sheet carry-in section 31. There is a cradle 32 provided immediately below the conveyance path, and a punch unit 60 provided immediately above the cradle 32. The paper P2 fed into the punch unit 60 constitutes the punch unit 60. A punch hole is drilled in the side portion (edge portion on the front end side) by driving a predetermined device.

  Incidentally, in the present embodiment, the paper receiving chute (second guide plate) 40, the rotating member 50, and the covering member (first guide plate) 45 (FIG. 2) form the conveyance guide portion according to the present invention. Has been. A sheet conveyance path is formed between the sheet receiving chute 40 and the rotating member 50 and the covering member 45 in the conveyance guide section. Further, the punching device according to the present invention is configured to include the conveyance guide portion and the punch portion 60.

  The branching portion 33 is a portion for distributing the paper P2 to one of the intermediate tray portion 34 and the paper discharging portion 35 according to the destination of the paper P2 after the punching process is performed by the punching portion 60. The destination of the paper P2 is determined automatically or according to a predetermined setting operation according to the type of image processing.

The intermediate tray portion 34 is a portion that performs post-processing such as stapling on the introduced paper P2, and the predetermined number of papers introduced here are temporarily stopped after being introduced into the intermediate conveyance path 341, and are then predetermined. After the stapling process is performed by the stapler, the paper discharge unit 35 is reversely fed and discharged to the paper discharge unit 35. The paper discharge unit 35 is discharged from the paper P2 or the intermediate tray unit 34 that has passed through the branching unit 33. It is a part that receives the received paper P2, and has a main paper discharge tray 351. The sheets P2 sent out from the branch section 33 or the intermediate tray section 34 are sequentially stacked on the main sheet discharge tray 351. Note that a multi-stage multi-job tray 342 may be adopted as an option. The multi-job tray 342 is used, for example, when performing a sorting process or when changing the discharge position according to the type of image formation.

  The sheet folding portion 36 is a portion that performs a folding process (a folding process) on the sheet P2 after the fixing process, which is folded in half from the center. The sheet P2 to be folded is introduced into the sheet folding section 36 through the intermediate conveyance path 341 of the intermediate tray section 34, and the processed sheet P2 is discharged to the dedicated folding tray 361.

  FIG. 2 is a side view illustrating the first embodiment of the punching device according to the present invention, and is an enlarged view of a corresponding portion of FIG. (B) is a state immediately after the sheet P2 is bent due to movement prevention at the punch unit 60, and (c) is a state where the sheet P2 is branched when the movement prevention at the sheet carry-in unit 31 is released. Each of the states being sent toward the unit 33 is shown.

  As shown in FIG. 2, the sheet receiving chute 40 provided in the sheet carry-in section 31 is at the same height level as the contact position of each peripheral surface of the carry-out roller pair 243 on the image forming section 20 side. 2, a horizontal guide plate 41 extending in the right and left direction), a lower inclined plate 42 inclined downward from the rear end edge (right side in FIG. 2) of the horizontal guide plate 41 toward the rear, and the lower inclined plate 42. And an extension plate 43 that extends slightly rearward from the rear edge of the rear end edge.

  The rear end edge of the bearing 43 is set so as to face the lower part of the pair of carry-out rollers 243 facing each other in the vertical direction, and thereby the sheet P2 fed from the pair of carry-out rollers 243 is prevented from moving forward. A lower bending receiving space (second loop space) 44 for receiving the bending of the paper P2 is formed by the inclined plate 42 (see (B) in FIG. 2).

  Further, a cover member 45 that covers the front position from a substantially intermediate position in the front-rear direction of the horizontal guide plate 41 is disposed above the horizontal guide plate 41. The covering member 45 covers the front half (left side in FIG. 2) of the horizontal guide plate 41, the parallel plate 46 parallel to the horizontal guide plate 41, and the rear edge from the rear edge of the parallel plate 46. And an upper inclined plate (first loop guide portion, plate member) 47 which is inclined to the right.

  Between the parallel plate 46 and the horizontal guide plate 41, a paper passage passage 48 through which the paper P2 can pass is formed. An upper deflection receiving space (first loop space) 49 is formed between the horizontal guide plate 41 and the upper inclined plate 47 to correspond to the upward deflection of the paper P2 in a state where the paper P2 is prevented from moving forward. To be.

  Further, at the leading end portions of the horizontal guide plate 41 and the parallel plate 46, a pair of feeding rollers 401 in a state where each peripheral surface penetrates a part thereof is provided, and the sheet passing path is driven by the driving of the pair of feeding rollers 401. The paper P2 positioned at (a part of the paper transport path) 48 is reliably fed toward the punch unit 60.

  The rotating member 50 vigorously advances the paper P2 once bent in the lower bending receiving space 44 and the upper bending receiving space 49 by its weight at the moment when the movement prevention of the paper P2 in the punch unit 60 is released. It is for making it happen. The rotating member 50 is formed of a long plate body in the width direction (a direction orthogonal to the paper surface of FIG. 2), and has a construction shaft 51 penetrating in the width direction (this construction shaft 51 is the post-processing section casing 15. It is possible to rotate forward and backward around the installation shaft 51 by being pivotally supported on the opposite side plate 16 as described above.

  Although not shown in FIG. 2, the rotating member 50 is actually formed in a comb-teeth portion corresponding to the upper inclined plate 47, and the upper inclined plate 47 is also formed in a comb-teeth shape. Between the respective comb teeth is fitted into the other party, so that they do not interfere with each other.

  The installation shaft 51 is set near the upper position of the boundary between the horizontal guide plate 41 and the lower inclined plate 42 of the paper receiving chute 40 (in the example shown in FIG. 2, the position closer to the lower inclined plate 42). And between the lower surface of the rotating member 50 and the upper surface of the horizontal guide plate 41 in a state in which the rotating member 50 is set to a correct horizontal posture (a posture set parallel to the horizontal guide plate 41). The installation position of the installation shaft 51 is set so as to form a gap that allows the paper P2 to pass therethrough.

  The rotating member 50 is dimensioned so that the longitudinal length is slightly shorter than the longitudinal length of the paper receiving chute 40, and the length dimension from the erection shaft 51 to the tip (left side in FIG. 2) is the erection shaft. It is set to approximately twice the length dimension from 51 to the rear end, so that it normally receives a counterclockwise force around the installation shaft 51 with the weight of the front part, and is set to a substantially horizontal posture. .

  When the paper P2 is supplied between the paper receiving chute 40 and the rotating member 50 by driving the carry-out roller pair 243, the paper P2 moves the rotating member 50 around the installation shaft 51 slightly in the clockwise direction. While being rotated, it enters into the gap between the rotating member 50 and the horizontal guide plate 41, and goes to the punch section 60 through the paper passage passage 48.

  The punch section 60 has a casing 61 laid between the side plates 16 (FIG. 1) facing each other of the post-processing section casing 15, and penetrates the casing 61 in the width direction (direction perpendicular to the paper surface of FIG. 2). Punch shaft 62, a punch rod 63 that moves up and down by rotation about the axis of the punch shaft 62 in a predetermined direction, and a gate member that opens and closes the conveyance path of the paper P2 in synchronization with the vertical movement of the punch rod 63. 64. The punch shaft 62 is rotated by a drive motor (not shown) according to the conveyance state of the paper P2 (specifically, with the leading edge of the paper P2 positioned directly below the punch rod 63). . The punch rod 63 is formed of a cylindrical rod-like body, and a punch blade 631 is formed at the lower end.

  On the other hand, the punch portion 60 is provided with a lower guide plate 65 whose upper surface is set slightly below the horizontal guide plate 41, and an upper guide plate 66 that is disposed above the lower guide plate 65 so as to face the lower guide plate 65. It has been. In the central portion of the upper guide plate 66, the top of the cradle 32 (FIG. 1) is penetrated from below, and a gap through which the paper P2 can pass is formed between the top surface of the top and the lower surface of the upper guide plate 66. Is formed.

  A through-hole through which the punch rod 63 can be inserted is formed in the top portions of the upper guide plate 66 and the cradle 32, and the paper P <b> 2 exists between the top guide plate 66 and the top portion of the cradle 32. When the punch rod 63 (FIG. 2 (a)) located at the position is lowered and penetrates the through hole and is located at the lower position ((b) in FIG. 2), the punch hole is punched in the paper P2. It has come to be.

  The gate member 64 includes a gate member main body 642 rotatably supported around a gate shaft 641 provided between the side plates 16 (FIG. 1) facing each other of the post-processing section casing 15, and the gate member. The main body 642 is configured to include a stopper 643 projecting downward from the front end portion of the main body 642.

  The gate shaft 641 is provided at a position that does not interfere with the punch rod 63 slightly behind (rightward in FIG. 2) the central portion of the upper guide plate 66 in the front-rear direction (left-right direction in FIG. 2). The rear portion of the main body 642 is pivotally supported by the gate shaft 641. The gate member main body 642 is provided with a recess or a hole in a portion that interferes with the punch rod 63, and extends to a position ahead of the punch rod 63 in a state where interference is avoided. Therefore, the stopper 643 is positioned in front of the punch rod 63.

  The gate member 64 penetrates through the upper guide plate 66 and the lower end edge comes into contact with the top of the cradle 32, thereby preventing the passage of the paper P2.

  The gate member 64 configured as described above is configured to prevent passage of the paper P2 by the lowered stopper 643 in accordance with the state of the fed paper P2 and in conjunction with the punch rod 63 (FIG. 2). (B) and (b) in FIG. 2 and the passage allowable posture ((c) in FIG. 2) allowing the passage of the paper P2 by raising the stopper 643.

  Specifically, the gate member 64 is set in the passage blocking posture (conveyance blocking posture) until the leading end of the paper P2 reaches directly below the punch rod 63 set at the upper position, and the paper P2 This is detected by a predetermined sensor when the leading edge of the sheet contacts the stopper 643. Based on this detection signal, the punch rod 63 descends to punch punch holes in the paper P2, and then the punch rod 63 ascends at the same time as the gate. The posture of the member 64 is changed to a passage allowable posture (conveyance allowable posture).

  Hereinafter, the operation of the present invention will be described with reference to FIG. First, in the state shown in FIG. 2A, the paper P2 is advanced by the drive of the carry-out roller pair 243, and the paper passage passage 48 between the rotating member 50 and the horizontal guide plate 41 of the paper receiving chute 40. Through the pair of feed rollers 401 provided on the downstream side (left side in FIG. 2) of the paper passage passage 48 and directly below the upper guide plate 66, and the leading edge is set in a passage blocking posture. By abutting against the stopper 643 of the gate member 64, further advancement is prevented.

  Even in this state, since the carry-out roller pair 243 continues to be driven, the sheet P2 is continuously fed toward the post-processing unit 30 side, but the leading edge is blocked by the stopper 643 and cannot advance. The upstream side of the upper inclined plate 47 (to the right in FIG. 2) bends as shown in FIG.

  Then, the bending member 50 is rotated clockwise around the erection shaft 51 against the gravity by bending so that the portion on the downstream side of the erection shaft 51 of the paper P2 bulges upward. The portion of the sheet P2 upstream of the installation shaft 51 is bent so as to bulge downward in a lower bending receiving space 44 by a lower inclined plate 42 formed behind the sheet receiving chute 40 (rightward in FIG. 2). As a result, the forward blocking of the paper P2 is absorbed.

  During the bending operation of the paper P2, the leading edge of the paper P2 that is prevented from advancing by the stopper 643 due to the lowering of the punch rod 63 by the drive of the punch portion 60 as shown in FIG. A punch hole is drilled.

  When the punch hole is punched in the paper P2, the punch rod 63 is immediately raised, and the posture of the gate member 64 that has been set in the passage preventing posture is changed to the passage-permissible posture in synchronization with this rise. Therefore, the rotation prevention of the paper P2 by the stopper 643 is released, so that the rotating member 50 has a weight on the front side of the installation shaft 51 (more precisely, the moment on the front side of the installation shaft 51 and the rear side of the rotation member 50). Due to the difference in moment), it rotates counterclockwise around the erection shaft 51, and the energy at the stored position is released. As a result, as shown in FIG. 2C, the sheet P2 is vigorously pushed forward by the counterclockwise rotation of the rotating member 50 around the installation shaft 51. It will be conveyed toward the branch part 33 (FIG. 1).

  When the trailing edge of the paper P2 passes the punch portion 60, a predetermined sensor detects this, and the posture of the gate member 64 that has been set to the passage-permitting posture is changed to the passage-blocking posture based on this detection signal. Then, it is prepared for the next sheet P2.

  As described in detail above, the punching device of the present invention has a horizontal guide plate 41 whose upper surface is along the conveyance direction of the paper P2, and is opposed to the upper side of the horizontal guide plate 41 in a direction perpendicular to the conveyance direction. A pivoting member 50 pivotally supported around a horizontally extending construction shaft 51, a passage blocking posture that stops against the leading edge of the paper P2 and prevents the conveyance of the paper P2, and a passage where the above-mentioned stopper is released. A gate member 64 having a posture changeable between an allowable posture and a punch portion 60 provided on the downstream side of the horizontal guide plate 41 and operating in a state in which the gate member 64 is set in a passage blocking posture. It is a premise.

  The installation shaft 51 is provided at a position substantially opposite to the rear end edge of the horizontal guide plate 41, and the rotation member 50 has a distance between the installation shaft 51 and the rear end portion between the installation shaft 51 and the front end portion. Since the lower deflection receiving space 44 that can absorb the deflection of the sheet P2 is formed at a position rearward of the rear end portion of the horizontal guide plate 41 and is set to be longer than the distance between When the sheet P2 is stopped by the gate member 64 that is set in the passage preventing posture for the punching operation by the punching unit 60, the conveyance of the sheet P2 is continued, so that the sheet P2 moves upward from the horizontal guide plate 41. Accordingly, the rotating member 50 is rotated about the installation shaft 51, but a lower bending receiving space 44 capable of absorbing the bending of the paper P <b> 2 is formed at a position rearward of the rear end portion of the horizontal guide plate 41. Because the paper 2 by flexing even at the receiving space 44 flex the lower, the amount of deflection is reduced toward the direction of the turning member 50 of the paper P2. Therefore, the rotation member 50 has a smaller rotation range than the conventional perforating apparatus 90 (FIG. 7) in which the lower bending receiving space 44 is not provided at a position rearward of the rear end portion of the horizontal guide plate 41. This makes it possible to reduce the capacity of the device main body that accommodates the rotating member 50, and contribute to making the post-processing unit casing 15 compact.

  Further, since the horizontal guide plate 41 is provided with a lower inclined plate 42 that extends downward from the rear end portion toward the rear, the turning member 50 is rotated around the installation shaft 51 by the bending of the paper P2. The sheet P2 that is bent so as to swell downward in the lower bending receiving space 44 behind the horizontal guide plate 41 is inclined downward from the rear end portion of the horizontal guide plate 41. It becomes the state supported by 42, and the rotation member 50 can be reliably rotated by the reaction force by this.

  Further, since the length dimension between the rear end portion of the rotating member 50 and the installation shaft 51 is set to be approximately equal to the length dimension of the lower inclined plate 42 in the front-rear direction, the length of the paper P2 When the rotating member 50 is rotated upward around the installation shaft 51 by the upward bulging, the rear portion of the rotation member 50 is rotated downward around the installation shaft 51. As a result, the sheet P2 is pressed against the lower inclined plate 42 and is forcibly bent in the bending allowable space behind the horizontal guide plate 41, and the amount of bending consumed for the rotation of the rotating member 50 is ensured. The maximum height dimension of the rotating member 50 can be reliably reduced as compared with the conventional case.

  By applying such a punching device to the post-processing unit 30 of the image forming apparatus 10, it is possible to contribute to downsizing of the post-processing unit 30.

  FIG. 3 is a side sectional view showing a second embodiment of the perforating apparatus according to the present invention. FIG. 3A shows a state in which the lid 302 of the apparatus main body 301 of the post-processing unit 30 is closed. (B) shows a state in which the lid 302 is opened. 4 and 5 are views showing an embodiment of the first guide plate unit provided in the perforating apparatus shown in FIG. 3, and FIG. 4 is a view of A of the rotating member support unit 70 shown in FIG. FIG. 5 is a perspective view of the line B, and FIG. 5 is a perspective view of the line B. 4 and 5, the XX direction is referred to as the width direction, and the YY direction is referred to as the front-rear direction. In particular, the -X direction is the first width direction, the + X direction is the second width direction, and the -Y direction is the front. Alternatively, the downstream side and the + Y direction are referred to as the rear side or the upstream side.

  First, as shown in FIG. 3, the punching device according to the second embodiment has a configuration on the downstream side (left side in FIG. 3) of the feeding roller pair 401, that is, the feeding roller pair 401 and the punch unit 60. Although the configuration is the same as that of the first embodiment, the configuration on the upstream side of the feeding roller pair 401 (the portion where the rotation member 50 is formed in the first embodiment) is different from the configuration of the first embodiment. is doing.

  That is, in the second embodiment, a rotating member support unit is provided in the space corresponding to the lower and upper bending receiving spaces 44 and 49 (loop space V) instead of the upper inclined plate 47 and the rotating member 50. A (first guide plate unit) 70 is provided. In the previous embodiment, the extension plate 43 is formed by extending the upstream side of the horizontal guide plate 41 toward the upstream side in the forward direction. However, in the second embodiment, such extension is performed. Instead of the mounting plate 43, a rotating member support unit (first guide plate unit) 70 and a lower guide member 78 facing the lower portion thereof are provided.

  As shown in FIGS. 4 and 5, the rotating member support unit 70 includes a frame member 71 having a rectangular shape in plan view, a flexure holding plate 72 formed in the frame of the frame member 71, and A plurality of rotating pieces (loop forming auxiliary members) 73 corresponding to the rotating member 50 of the first embodiment are provided so as to intersect with the bending portion holding plate 72.

  The frame member 71 includes a rear frame plate 711 that is elongated in the width direction, a front frame plate 712 that is disposed in parallel to a downstream position of the rear frame plate 711, and end portions of the frame plates 711 and 712. It is composed of a pair of installation plates 713 in the width direction that are integrally installed between them. A protruding plate 714 protruding toward the upstream side is provided on the upper edge portion of the front frame plate 712. When the rotating member support unit 70 is rotated on the protruding plate 714, a fingertip is used. A box-shaped operation member 74 to be operated is fixed.

  The bent portion holding plate 72 covers the portion bent upward from the sheet P in the loop space V (FIG. 3) to hold the bent portion, and the rear frame plate 711 and the front frame. The plate 712 is integrated with them over the entire length. The bent portion holding plate 72 is set in a mountain shape having a vertex at a position slightly upstream from the central portion in the front-rear direction in a side view, and a first guide plate 721 is formed forward from the vertex. A rear plate 722 is formed on the rear side. As shown in FIG. 3, the loop space V is formed by a space surrounded by the first guide plate 721 and the rear plate 722.

  The bending portion holding plate 72 has a plurality of cutout openings (slits) 723 formed in a width direction formed by cutting the first guide plate 721 and the rear plate 722 downward from the apex position. Thus, the first guide plate 721 and the rear plate 722 are comb-like.

  A plurality of the rotating pieces 73 are employed corresponding to the notch openings 723 of the bent portion holding plate 72. Each of the rotating pieces 73 is pivotally supported so as to be integrally rotatable around a rotating piece support shaft 75 installed between the front positions of the pair of installation plates 713, and is shown by a two-dot chain line in FIG. The posture can be changed between the passing posture and the paper bending posture indicated by the solid line. In such a state that the rotating piece 73 is set to the paper passing posture, the rear portion of the rotating piece 73 fits into the notch opening 723 as shown in FIGS. 4 and 5, and the posture is set to the paper bending posture. In this state, as shown by a solid line in FIG. 3A, the installation position is set so as to be positioned above the first guide plate 721.

  The rotating piece support shaft 75 is provided with a cylindrical spacer 76 that is externally fitted together while being sandwiched between adjacent rotating pieces 73. The spacer 76 has a stopper piece 761 projecting outward from the peripheral surface, and the spacer 76 is bent in a state where the rotating piece 73 is set to a sheet passing posture. By stopping against the first guide plate 721, the sheet passing posture of the rotating piece 73 is maintained.

  Further, a through hole 715 for penetrating a unit support shaft 77 described later is formed at a rear position of each erection plate 713.

  On the other hand, as shown in FIG. 3, the apparatus main body 301 of the post-processing unit 30 has a unit support shaft (in the upper part on the inner side of the sheet receiving port 303 extending in the width direction between the side plates (not shown) of the apparatus main body 301. An opening support shaft 77 is provided. The rotating member support unit 70 can be rotated forward and backward around the unit support shaft 77 by penetrating the unit support shaft 77 through the through-hole 715 of the installation plate 713. The posture can be changed between the stationary posture shown in FIG. 3B and the paper jam clearing posture shown in FIG. 3B rotated about 60 ° clockwise around the downstream installation shaft 77 from the paper passing posture. ing.

  As shown in FIG. 3, the lower guide member 78 first receives the paper P sent from the image forming apparatus 10 (FIG. 1) into the paper storage unit 30 via the post-processing unit 303. The rotating member support unit 70 is disposed opposite to the rotating member support unit 70 at a position below the moving member support unit 70. The lower guide member 78 is installed between a pair of fixing plates 781 fixed to a pair of side plates (not shown) in the width direction of the apparatus main body 301 (a direction orthogonal to the paper surface of FIG. 3), and the fixing plates 781. It consists of a guide plate (second guide plate) 782.

  The lower guide member 78 is provided so as to incline forward so that the guide plate 782 is parallel to the rotating piece 73 set in a paper passing posture (indicated by a two-dot chain line in FIG. 3A). In addition, a sheet receiving port 303 is provided on the upstream edge. Accordingly, the paper P fed from the image forming apparatus 10 is first received by the guide plate 782 of the lower guide member 78 and passes between the guide plate 782 and the rotating piece 73 toward the punch unit 60. become.

  In the present embodiment, a lid 80 is provided on the upper surface of the apparatus main body 301 so as to cover the punch portion 60 and the rotating member support unit 70 in an openable and closable manner. The lid body 80 includes a lid main body 81 and a bracket 82 having a U-shaped shape protruding outward from a rear end portion of the lid main body 81. The rear upper end of the bracket 82 is pivotally supported around a lid support shaft 83 provided in the upper direction of the apparatus main body 301 in the width direction, thereby the closing posture shown in FIG. The posture can be changed between the open posture shown in 3 (b).

  According to the punching device of the second actual form configured as described above, the sheet receiving from the image forming apparatus 10 in a state where the gate member 64 is set to the passage blocking posture as shown in FIG. When the paper P is fed into the post-processing unit 30 through the inlet 303, the leading edge of the paper P is blocked by the stopper 643 of the gate member 64, and the progress is stopped. During this stop, the punching process by the punch rod 63 is performed. Is given.

  Even while this punching process is completed, the feeding of the paper P by the pair of carry-out rollers 243 (FIG. 2) is continued, so the portion of the paper P positioned below the rotating piece 73 is upward. 3, swells into the loop space V, whereby the rotating piece 73 is pushed up by the swelled paper P, and is rotated counterclockwise around the rotating piece support shaft 75, as shown in FIG. Will be in the state indicated by the solid line.

  In this way, while the punching process by the punch rod 63 is performed on the leading end portion of the paper P, the bending of the paper P is absorbed by the loop space V while pushing up the downstream side link arm 73, so There is no hindrance to the conveyance of the paper P. When the punching process is completed, the stopper 643 of the gate member 64 moves upward and the stop of the sheet P is released. Therefore, the sheet P advances while the bending is restored, and is fed into the apparatus main body 301. At the same time, the turning piece 73 is turned clockwise around the turning piece support shaft 75 and returned to the passage allowable posture shown by a two-dot chain line in FIG.

  Next, when the sheet P in the punching process is being jammed in the vicinity of the loop space V for some reason, as shown in FIG. 3B, the lid body 80 is opened and formed. A paper jam is eliminated by inserting a hand into the apparatus main body 301 from the upper surface opening of the apparatus main body 301 as indicated by a white arrow. At this time, the operation member 74 is lifted upward to rotate it. Since the moving member support unit 70 is rotated clockwise around the unit support shaft 77, and the jammed paper P is exposed to the outside as shown in FIG. The operation of removing the jammed paper P can be easily performed.

  The present invention is not limited to the above embodiment, and includes the following contents.

  (1) In the above embodiment, the paper receiving chute 40 is composed of the horizontal guide plate 41, the lower inclined plate 42, and the extended plate 43, but the lower inclined plate 42 and the extended plate 43 are It does not necessarily have to be provided. That is, even if the lower inclined plate 42 and the extension plate 43 are not provided, as long as there is a space that can accept the deflection of the paper P2 in this portion, the deflection of the paper P2 in the state where the forward movement is prevented is absorbed. Because it can. Further, when the lower inclined plate 42 and the extended plate 43 are not present, the amount of bending of the paper P2 is not restricted, and the degree of freedom of bending absorption is increased.

  (2) In the above embodiment, the rotating member 50 has a portion (rear portion) corresponding to the lower inclined plate 42 on the upstream side (right side in FIG. 2) from the installation shaft 51. In addition, the rear portion may be eliminated. By doing so, the sheet P2 can be bent upward due to the absence of an obstacle, and the degree of freedom of the bending operation of the sheet P2 is increased.

  (3) In the above embodiment, the paper passage passage 48 formed between the carry-out roller pair 243 and the punch portion 60 is formed horizontally, but in the present invention, the paper passage passage 48 is horizontal. It is not limited to a certain thing, You may incline with respect to a horizontal surface, and may be arrange | positioned so that it may extend perpendicularly | vertically. However, when the inclination is steep or vertical, it is necessary to always urge the rotating member 50 in the direction of the sheet conveyance path by an urging means such as a coil spring.

  (4) Further, when the rotation member 50 is urged by the urging means in a state where the paper passage passage 48 is set horizontally, the urging force of the urging means does not depend on the gravity, but by the rotation member 50. Since the sheet P can be pressed, the lower bending receiving space 44 can be provided on the downstream side of the upper bending receiving space 49 on the condition that the rotating member 50 is provided at a position below the sheet passing passage 48.

  (5) FIG. 6 is a side view illustrating a third embodiment of the punching device according to the present invention, and FIG. 6 (A) is a gate member in which the forward movement of the fed paper is set to the conveyance blocking posture. (B) shows a state in which the deflection of the sheet is received in the loop space V. The punching device of this embodiment is a modification of the punching device of the first embodiment, and the point that the rear end portion of the rotating member 50 ′ is pivotally supported by the installation shaft 51 and the paper receiving chute 40 are a horizontal guide. This is different from the first embodiment in that it is formed only by the plate 41, is not provided with the lower inclined plate 42 as in the first embodiment, and is substantially horizontal over the entire length. Other configurations are the same as those of the first embodiment.

  According to the punching device of the third embodiment, the same effects as those of the first embodiment can be obtained except that the paper P does not bend downward.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory side sectional view showing a first embodiment of an image forming apparatus including a paper punching device according to the present invention. FIG. 2 is an enlarged view of a corresponding portion of FIG. 1 for explaining the punching device according to the first embodiment in detail, where (a) is a state immediately after the sheet is fed into the punch portion, and (b) is a punch portion. A state in which the paper P2 is bent due to the movement prevention at (3) shows a state in which the paper is being fed toward the branching part by releasing the movement prevention at the paper carry-in part. It is explanatory drawing of the side sectional view which shows 2nd Embodiment of the punching apparatus which concerns on this invention, (A) is the state with which the cover body of the apparatus main body of the post-processing part was closed, (B) is the cover body Indicates the opened state. It is a figure which shows one Embodiment of the 1st guide plate unit provided in the perforation apparatus shown in FIG. 3, and is a perspective view of the rotation member support unit of A line view. It is a figure which shows one Embodiment of the 1st guide plate unit provided in the perforation apparatus shown in FIG. 3, and is a perspective view of the rotation member support unit seen in B line. It is explanatory drawing of the side view which shows 3rd Embodiment of the punching device which concerns on this invention, (A) is the state by which the advance of the sent paper was blocked | prevented by the gate member set to the conveyance prevention attitude | position, ( (B) shows a state in which the deflection of the sheet is received in the loop space V. FIG. 8 is an explanatory view illustrating a conventional punching device, in which (a) is a state in which the advance of the fed paper is blocked by a gate member set to a conveyance blocking posture, and (b) is a deflection of the paper. Each state received in the receiving space is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 11 Image forming unit housing 12 Transport path 13 Paper discharge port 20 Image forming unit 21 Document loading unit 211 Cover lid 212 Document tray 213 Document feeding mechanism 22 Image reading unit 221 Contact glass 222 Image reading mechanism 223 Moving light source 224 Optical system member 225 Mirror 226 Lens member 23 Transfer unit 231 Photosensitive drum 232 Transfer belt 233 Development unit 24 Fixing unit 241 Fixing roller 242 Pressure roller 243 Unloading roller pair 25 Paper storage unit 251 Paper cassette 252 Pickup roller 253 Feed Paper roller 26 Reverse section 30 Post-processing section 301 Main body 302 Cover body 303 Paper receiving port 31 Paper carry-in section 32 Receiving base 33 Branching section 34 Intermediate tray section 341 Intermediate transport path 35 Paper discharge section 351 Main paper discharge tray 36 Middle folding of paper Part 361 Lee 40 sheet receiving chute (second guide plate)
401 Feed roller pair 41 Horizontal guide plate 42 Lower inclined plate (second loop guide portion)
43 Extension plate 44 Lower deflection receiving space (second loop space)
45 Cover member (first guide plate)
46 Parallel plate 47 Upper inclined plate (first loop guide part, plate member)
48 Paper passage (part of paper transport path)
49 Upper deflection receiving space (first loop space)
50 Rotating member (loop forming auxiliary member)
51 Installation shaft (support shaft) 60 Punch part 61 Casing 62 Punch shaft 63 Punch rod 631 Punch blade 64 Gate member 641 Gate shaft 642 Gate member body 643 Stopper 65 Lower guide plate 66 Upper guide plate 70 Rotating member support unit (first) Guide plate unit)
71 Frame member 711 Rear frame plate 712 Front frame plate 713 Installation plate 714 Projection plate 715 Through hole 72 Deflection portion holding plate (plate member)
721 First guide plate 722 Rear plate 723 Notch opening (slit)
73 Rotating piece (Loop formation auxiliary member)
74 Operating member 75 Rotating piece support shaft 76 Spacer 77 Unit support shaft (opening support shaft)
78 Lower guide member 781 Fixed plate 782 Guide plate 80 Cover 81 Cover body 82 Bracket P1 Document P2 Paper V Loop space (loop space)

Claims (6)

A punch unit that temporarily stops the conveyance with respect to the leading edge of the paper being conveyed, and in the meantime, punches at a predetermined position on the leading edge side, and guides the conveyance of the paper to the punch unit located upstream of the punch part. In a perforating apparatus comprising a transport guide section
The conveyance guide portion is provided with a first guide plate and a second guide plate that form a sheet conveyance path between opposing surfaces, and a loop space portion that allows the sheet to bend and deform is provided between both guide plates. Is further provided with a loop forming auxiliary member that can freely move in and out of the loop space,
The loop forming auxiliary member has a sheet passing posture that allows the sheet that is conveyed to protrude into the loop space, and the sheet that is conveyed while being immersed from the loop space is stopped in the loop space. A punching device characterized in that the posture can be changed to a paper bending posture that allows bending in a loop shape.   The loop space portion is formed by a plate member that extends either the first guide plate or the second guide plate in a direction perpendicular to the paper transport direction. The perforating apparatus according to claim 1. In the first guide plate, a first loop guide that forms a first loop space that opens toward the upstream side by bending a part of the first guide plate in a direction away from the second guide plate. Part is provided,
In the second guide plate, a part of the second guide plate is bent in a direction away from the first guide plate, thereby opening the second guide plate on the upstream side of the first loop guide portion and further on the upstream side. A second loop guide portion that forms a two-loop space is provided to constitute the loop space portion,
Between the first loop guide portion and the second loop guide portion, there is provided a loop forming auxiliary member that is rotatable around a support shaft that is parallel to the width direction of the paper conveyance path,
This loop forming auxiliary member is formed by a parallel posture parallel to the paper transport path through which the transported paper can pass, and the transported paper bends in a loop toward the first loop space when the leading edge stops. 2. The perforating apparatus according to claim 1, wherein the drilling device is pivotally supported by the support shaft at a substantially intermediate position so that the posture of the support shaft can be changed between an inclined posture that rotates around the support shaft and tilts.   At least one of the first guide plate or the second guide plate is rotatably supported by an opening support shaft parallel to the width direction of the paper transport path, and is configured by the first guide plate and the second guide plate. The perforating apparatus according to any one of claims 1 to 3, wherein the conveying path can be opened to the outside by the rotation operation. The first guide plate and the second guide plate are arranged in a vertical relationship, and the first guide plate unit including the first guide plate is rotatably supported so as to open the sheet conveyance path to the outside. Because
The first guide plate unit includes a first guide plate made of a plate member that extends the paper transport path in a direction orthogonal to the paper transport direction, a frame member that holds the first guide plate, and a first guide. With a loop forming auxiliary member that can be projected and retracted into the loop space through a slit provided in the plate,
The perforating apparatus according to claim 4, wherein the first guide plate unit is opened by supporting the frame member so as to be rotatable by the opening support shaft.   2. A post-processing apparatus connected to a downstream side of an image forming apparatus configured to transfer a read original image onto a sheet, and performing post-processing on the sheet on which transfer processing has been completed. A post-processing device that is applied.

Images