JP2009018357A - Sheet puncher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely feed and set a sheet at a predetermined punching position, to constitute a punching edge to be small, and to constitute a punching mechanism to be small in size, compact and inexpensive. <P>SOLUTION: A sheet puncher includes a conveyance roller capable of normally and reversely rotating for gripping sheets successively supplied from a sheet conveyance path to feed and discharge to a downstream punching position, a paper mount for mounting and supporting a rim to be punched of the sheet fed by the conveyance roller, the punching edge formed above the paper mount for punching a hole at the rim of the sheet carried by the conveyance roller, a tooth rest hole formed at the paper mount and fitted to the punching edge with each other, a punch driving means for vertically moving the punching edge between a top dead center and a bottom dead center, and a control means for driving and controlling a pair of the rollers and the punch driving means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sheet punching device that punches punch holes in a sheet conveyed from an image forming apparatus such as a copying machine, a printing machine, or a printer, and a post-processing device such as an image forming apparatus including the punching device.

  Generally, a punching device that punches filing punch holes in a sheet of paper or the like is a device (stationery) that manually presses a handle connected to a punch member on several sheets as office equipment, a printing machine, An apparatus (a post-processing apparatus described later) that automatically punches a sheet carried out from a copying machine or the like is known. The former is widely known as a device in which a cylindrical punch member is arranged on a frame member so as to be movable up and down with a sheet interposed therebetween, and is pushed down by an operation handle to penetrate the sheet. On the other hand, the latter is incorporated and used in various devices as a device for setting a sequentially conveyed sheet at a predetermined punching processing position and pressing a punch member with a driving motor to punch the sheet. In these apparatuses, the sheet is simultaneously punched at two, three or four places at a predetermined interval, and the number of holes and the hole interval are set to a unified standard.

  As an apparatus for punching a punch hole by pressing the operation handle as described above, for example, Patent Document 1 provides an upper frame and a lower frame having an interval for inserting a sheet to be punched, and the upper frame has a cylindrical shape. A structure is disclosed in which a punch member is supported in a vertically movable manner and a die (blade receiving hole) that fits the punch member is provided in a lower frame. A punch hole is punched in a sheet set on the lower frame by pressing a punch member supported on the upper frame so as to be movable up and down with a handle.

  On the other hand, for example, a structure disclosed in Patent Document 2 is known as a punch unit that automatically punches punch holes in a sheet unloaded from the above-described image forming apparatus. In this document, an upper frame and a lower frame that are set with a sheet interposed therebetween are arranged at a predetermined interval, and a plurality of punch members are supported on the upper frame so as to be movable up and down, and a die ( A blade receiving hole) is formed. An apparatus is disclosed in which a plurality of punch members are actuated in a perforating direction by a drive motor to perforate a predetermined position of a sheet.

As described above, conventionally, as disclosed in Patent Documents 1 and 2, a spindle-shaped punch member is supported by an apparatus frame (upper frame) so as to move up and down, and the punch member is attached to a handle or a drive motor. A structure is employed in which the cam is pressed by a connected cam member. Therefore, the punch member is formed in a columnar or cylindrical shape (hereinafter referred to as a spindle shape) having a predetermined length, and the spindle-shaped punch member is axially supported on the upper frame so as to move up and down. Therefore, there is a problem that the apparatus becomes large and a punch member made of carbon steel or stainless steel becomes expensive at the same time. Therefore, for example, in Patent Document 3, the lower frame is configured so that the sheet is positioned and set at the punching position, and one end of the upper frame is slidably connected to the lower frame, and a punch member fixed to the upper frame is attached to the sheet. A structure for perforating is disclosed.
Japanese Utility Model Publication No. 4-2599 JP 2001-9791 A Japanese Patent Publication No. 7-25073

  As described above, when the punched sheet is placed and set on the lower frame (paper platform) and the punch member is pressed down from above, the punch member is conventionally formed into a spindle shape as shown in Patent Documents 1 and 2 above. It is composed. In this case, a punch member having a perforating blade at the tip is formed in a spindle shape so as to be long in the vertical direction, and its shaft portion is supported by the upper frame so as to move up and down. For this reason, a punch member is comprised by the shaft shape long in an up-down direction, and there exists a problem that the manufacturing cost becomes high. In other words, if the long-axis punch member has a predetermined shape and is not precisely machined in the axial direction, a smooth punching operation cannot be obtained. If stainless steel is used, the material itself is expensive, and if carbon steel is used, heat treatment is performed. There is a problem that the cost is increased, and the material cost and the processing cost are increased in proportion to the length in the axial direction. At the same time, the upper frame that supports the spindle-shaped punch member cannot be smoothly moved unless it is axially supported at two locations, so that the size of the device increases in the vertical direction and the manufacturing cost of the shaft support structure increases. There is.

  Therefore, as disclosed in the above-mentioned Patent Document 3, it is conceivable that the punch member is fixed to a swingable upper frame and swings in the vertical direction around the swing fulcrum. In this case, the drilling blade can be formed small, and the manufacturing cost can be suppressed. However, the above-mentioned Patent Document 3 employs a structure in which a user sets a perforated sheet at a perforating position with fingers and then presses the upper frame vigorously with the upper frame attached with a perforating blade expanded. For this reason, if this is employed in a post-processing apparatus that automatically feeds and sets sheets sequentially fed from the conveyance path to the punching position, the following problem occurs.

  First, when the sheet is set directly under the perforating blade, if the sheet sent by a conveying means such as a roller is curled upward, it will hit the perforating blade protruding downward from the upper frame and jam or There are many problems that do not reach the drilling position. Second, if the upper frame is made of a lightweight material such as a resin or a thin metal plate, when the frame is pressed during punching, the frame member is partially bent, and the perforation blade does not surely penetrate the sheet, which may cause malfunction. . Further, in the above-mentioned Patent Document 3, since it is integrally configured by a bending member in which the edge of the lower frame and the edge of the upper frame are connected, the perforated sheet is transported from the upstream side to the downstream side. A punch hole cannot be formed at the leading edge or the trailing edge.

Accordingly, the present invention is capable of reliably feeding and setting a sheet at a predetermined punching position, making the punching blade small, and punching sheets that can make the punching mechanism small and compact. The main problem is to provide the device at a low cost.
Further, according to the present invention, the sheet can be fed and set to an accurate punching position by a forward / reverse roller disposed upstream of a predetermined punching position, and at the same time, the set sheet can be surely held stationary and always at an accurate position. An object of the present invention is to provide a sheet punching device that can form punch holes.
Another object of the present invention is to provide a sheet punching device capable of forming a punch hole at the leading edge or the trailing edge in the course of movement of the sheet in a predetermined direction.

  The present invention adopts the following configuration in order to solve the above problems. First, the invention according to claim 1 is a transport roller capable of forward and reverse rotation that nips sheets sequentially supplied from a sheet transport path and feeds and discharges them to a downstream punching position, and a sheet fed by the transport roller. A paper platform for mounting and supporting the perforation edge of the sheet, a perforation blade for perforating a punch hole in the perforation edge of the sheet disposed above the paper platform and held by the conveying roller, and the paper platform A blade receiving hole that is fitted to the perforating blade, and a punch driving means that moves the perforating blade up and down between a top dead center and a bottom dead center; and a drive control of the roller pair and the punch driving means. Control means. The perforating blade is (1) integrally attached to a swing member extending in the transport direction of the sheet fed by the transport roller, and (2) one end of the swing member is disposed on the paper mount. Or (3) a sheet feeding direction distance between the swing fulcrum of the swing member and the punching point of the punching blade is a sheet nip of the conveying roller. It is set to be larger than the distance in the sheet feeding direction between the point and the punching point of the punching blade. Therefore, the punch driving means is configured to swing the swing member about the swing support point between a top dead center and a bottom dead center, and the control means is configured such that the swing member is at the top dead center. In this state, the roller pair is rotated forward to feed the sheet to the punching processing position, and the swinging member is moved to the bottom dead center while the sheet is held stationary by the roller pair to perform the punching process. Subsequently, the roller pair is reversely rotated in a state where the swinging member is returned to the top dead center, and the sheet is carried out from the punching processing position.

  According to a second aspect of the present invention, there is provided a pair of upper and lower upper plate members and a lower plate member having an interval through which a sheet enters, a perforating blade disposed on the upper plate member, and a blade receiver disposed on the lower plate member. A hole, a punch driving means for moving the punching blade up and down between a top dead center and a bottom dead center, a first conveying roller disposed on the upstream side of the upper plate member and the lower plate member, and a downstream side And a control means for controlling the punch driving means and the first and second transport rollers. The perforating blade is (1) integrally attached to the upper plate member, (2) one end of the upper plate member is pivotally supported by the lower plate member or an appropriate apparatus frame, and (3) The distance in the sheet feeding direction between the swing fulcrum of the upper plate member and the punching point of the punching blade is such that at least one sheet nip point of the first and second conveying rollers and the punching point of the punching blade are Is set to be larger than the distance in the sheet feeding direction between the two. Therefore, the punch driving means is configured to swing the upper plate member around the swing fulcrum between the top dead center and the bottom dead center. The control means rotates the first conveying roller while the upper plate member is located at the top dead center to feed the sheet to the punching processing position, and the sheet is conveyed to the first conveying roller or the second conveying roller. With the roller held stationary, the upper plate member is moved to the bottom dead center for punching, and then the second transport roller is rotated with the upper plate member returned to the top dead center for punching the sheet. Configure to unload from position.

  The perforating blade is formed in a cylindrical shape, and is fixed integrally to the swinging member or the upper plate member so that the tip edge portion protrudes toward the paper platform or the lower plate member.

  The swinging member is constituted by a plate-shaped guide member that forms a small gap between the swinging member and the paper platen, and the upper plate member is formed between the lower plate member and the paper platen or lower plate member. It is configured to guide the upper surface of the sheet fed and discharged along.

  The swing member or the upper plate member is provided with an elastic resin sheet or other flexible guide so that the sheet does not interfere with the perforating blade attached thereto.

  The swing member or the lower plate member is provided with a biasing means for biasing the top dead center side, and the driving means moves the swing member or the lower plate member against the bottom dead center side against the biasing means. And a cam member for pressing down the drilling blade attached to the drilling blade.

  The invention according to claim 1 is a paper table on which a perforated sheet is placed and supported on the downstream side of a forward / reversible transport roller that nips and feeds a sheet to a predetermined perforating position, and above the paper stage. The perforating blade is integrally attached to the swinging member, and (1) the swinging member is extended in the transport direction of the sheet fed by the transport roller, and (2) one end is a paper table or an appropriate one (3) Set so that the distance in the feed direction between the swing fulcrum and the punching point is greater than the distance in the feed direction between the roller nip point and the punching point. The transport roller is configured to feed and set the sheet from the transport path to the punching position and return the punched sheet in the direction opposite to the sheet feeding, and thus has the following effects.

  Compared to the case where the drilling blade is formed in a conventional spindle shape (long-axis shape) and supported so as to slide up and down, the drilling blade is integrally attached to the swing member, so that the blade itself is made smaller. I can do it. Thereby, for example, a cutting edge for processing a metal material by heat treatment can be manufactured at low cost. At the same time, the drilling blade moves up and down by the swinging motion of the swinging member that is supported at one end. Therefore, the vertical mechanism of the drilling blade can be configured simply and inexpensively compared to the conventional case where the shaft is supported in a cylindrical shape. Become.

  In addition, the punched sheet is punched at a predetermined punching position in a state where the sheet is nipped by a forward / reversible transport roller arranged upstream thereof, and the mechanism for feeding and discharging the sheet to and from the punching position is very simple. And can be made compact. In particular, by setting the distance interval between the nip point of the roller and the piercing point to be smaller than the distance interval between the oscillating fulcrum of the piercing blade and the piercing point, the positional deviation exerted on the sheet by the piercing blade oscillating during piercing. It is possible to prevent misalignment of the sheet by reducing the direction effect and simultaneously holding the vicinity of the punching point of the sheet with the nip force of the roller. Accordingly, punch holes with high quality can be formed on the perforated sheet.

  According to a second aspect of the present invention, a pair of upper and lower upper plate members and a lower plate member having a gap through which a sheet can enter is provided, and one end of the upper plate member is pivotally supported so that the upper plate member can swing up and down. The first and second transport rollers are disposed upstream and downstream of the upper and lower plate members, and the sheet is fed between the swing fulcrum of the upper plate member and the punching point of the punching blade. Since the distance in the direction is set to be larger than the distance in the sheet feeding direction between at least one sheet nip point of the first and second conveying rollers and the punching point of the punching blade, the following effect is obtained. Play.

  As described above, the drilling blade can be configured in a small and inexpensive manner, and a mechanism for moving the drilling blade up and down between the top dead center and the bottom dead center can be simply configured. At the same time, punch holes can be selectively formed at the leading edge or the trailing edge of the sheet in the process of transferring the sheet from the upstream first conveying roller to the downstream second conveying roller. That is, when a punch hole is formed at the leading edge of the sheet, the punching operation is executed while the sheet fed to the punching position by the first transport roller is held stationary by the first transport roller. When punch holes are formed on the rear end side of the sheet, the punching process is executed in a state where the sheet fed to the punching position is held stationary by the second transport roller.

  In this case, the distance interval between the swing fulcrum of the punching blade and the punching point is larger than the distance interval between the nip point of the first conveying roller or the second conveying roller that holds the sheet at the punching position and the punching point. Since it is set, the positional displacement effect exerted on the sheet by the swinging punching blade is small, and the vicinity of the punching point can be reliably held by the nip force of the roller. Therefore, it is possible to perform drilling processing with a high hole quality.

  Furthermore, in the invention of claim 1 and claim 2, a flexible guide having elasticity is provided on the swinging member or the upper plate member equipped with the punching blade so that the sheet does not interfere with the punching blade attached thereto. Therefore, when the sheet is fed to the punching position by this flexible guide, the sheet does not hit the punching blade located at the top dead center, and the flexible guide is elastically deformed when the punching blade moves to the bottom dead center. It becomes. Accordingly, the sheet can be accurately fed to and discharged from the punching position.

  The present invention will be described in detail below based on the best embodiment shown in the drawings. FIG. 1 is a perspective view showing the overall configuration of the punch unit A, FIGS. 2A and 2B are overall configuration diagrams of the punch unit A1 showing the first embodiment, and FIG. 3 shows the “first embodiment”. It is operation | movement state explanatory drawing of punch unit A1. FIG. 4 is an operation explanatory diagram of the punch unit A2 of the “second embodiment”.

[First Embodiment]
1, 2 </ b> A, and 2 </ b> B are attached to the paper platform 10, the swing member 20, the blade receiving hole (die) 11 formed in the paper platform 10, and the swing member 20. The punching blade 21 and punch driving means 22 for moving the swinging member 20 up and down are configured. The perforating blade 21 is disposed adjacent to a transport roller 30 that can feed the perforated sheet in a forward / reverse direction. Hereinafter, these configurations will be described.

  The paper platform 10 is composed of a plate member (hereinafter referred to as “lower plate member”) on which the perforated sheet S is placed and supported. The paper platform 10 is composed of a synthetic resin plate member or a metal plate member, and places and supports a perforation edge (a leading end portion in the feeding direction) of a sheet fed by a conveyance roller 30 described later. It is configured to shape. A blade receiving hole 11 is formed in the paper platform 10, and the blade receiving hole 11 is formed at predetermined intervals at two, three, or four locations in a direction orthogonal to the sheet feeding direction. Yes.

  The rocking member 20 forms a small gap d through which the perforated sheet S enters the paper platform 10 and is disposed above it. This is because the upper surface of the punched sheet S guided on the paper platform 10 is guided by the swing member 20. Accordingly, the perforated sheet S is guided to the perforation point P1 between the paper platform 10 composed of the plate-like member (lower plate member) and the swinging member (upper plate member) 20 disposed above it. A gap d is formed. The paper table 10 and the swinging member 20 constitute a pair of upper and lower paper guides for guiding the punched sheet S to the punching point P1.

  One end of the rocking member 20 is supported by the paper platform 10 (which may be an apparatus frame other than the paper platform), and is supported so as to be pivotable about its rocking fulcrum P2. That is, as shown in FIG. 2B (c), the bearing portion 20a of the swinging member (upper plate member) 20 is pivotally supported by the hinge pin 23 on the bearing piece 12 formed upright from the paper table 10. Then, the swing member 20 swings around the swing support point P2 shown in FIG. In particular, the swing fulcrum P2 is positioned so that the center of rotation is located substantially on the same plane as the perforated sheet S supported on the paper platform 10 or on an extended surface of the sheet plane (the xx plane shown in FIG. 2A (c)). It has become. This is because the punching blade 21 of the swinging member 20 swinging and rotating around the hinge pin 23 forms a punch hole from the direction perpendicular to the punched sheet S. Therefore, the swing center P2 of the hinge pin 23 may be disposed at a position that coincides with or near the sheet plane of the punched sheet S on the paper platform.

  The swing member 20, particularly the illustrated swing member 20 formed of an upper plate member for guiding the upper surface of the punched sheet S on the paper platform 10, has a punching blade 21 at one or a plurality of locations. It is attached integrally. The tip 21a of the punching blade 21 is formed in a cylindrical shape, and the tip edge thereof is formed in a sharp shape such as an oblique shape, a wave shape, or a U shape so as to easily penetrate the punched sheet S. The perforating blade 21 is configured such that the base end portion 21 b is fixed to the swing member 20 by fixing means 21 c such as caulking, welding, and bolting, and swings integrally with the swing member 20. Therefore, the drilling blade 21 integrally attached to the swing member 20 swings about the swing support point P2 and moves up and down between the top dead center U1 and the bottom dead center U2.

  As described above, the rocking member 20 is pivotally supported by the paper table 10 or an appropriate apparatus frame (not shown) and is always urged toward the top dead center U1. 40 is an urging spring, which acts between the paper mount 10 and the swing member 20 in the direction of expanding the swing member 20. And the punch drive means 22 which presses down this rocking | swiveling member 20 to the bottom dead center U2 side is arrange | positioned so that it may engage with the rocking | fluctuation member 20 or the punching blade 21 attached to this. The illustrated punch driving means 22 includes a driving motor M1, a driving rotary shaft M2 connected to the driving motor M1, and a driving cam M3 supported by the driving rotary shaft M2. The drive cam M3 is constituted by, for example, an eccentric cam as shown in the figure, and the drive cam M3 is configured to move the swing member 20 from the top dead center U1 to the bottom dead center U2. In this case, if the swinging member 20 is formed of a flat plate member, the punching blade 21 attached to the swinging member 20 may not reliably penetrate the punched sheet S due to the bending of the swinging member. In the case of such a thin plate-like swinging member that is easily bent, the illustrated configuration is adopted. In other words, the drive cam M3 is provided at a position corresponding to the plurality of drilling blades 21 on the drive rotating shaft M2, and the drive cam M3 is engaged with the base end portion 21b of the drilling blade 21. With this configuration, the drilling blade 21 provided on the swing member 20 is surely pressed from the top dead center U1 to the bottom dead center U2 by the drive cam M3, and at the same time, the motion (swing motion) is the swing support point P2. Rotation is restricted around the center.

  As described above, the punching blade 21 supported by the swing member 20 is disposed above the punching point P1 shown in FIG. Therefore, a conveyance roller 30 (conveyance means) connected to the conveyance path 31 is disposed on the upstream side of the punching point P1. The conveying roller 30 is composed of, for example, a pair of rollers that nip and support the sheet, and is connected to a drive motor that can rotate forward and backward. Therefore, the punched sheet S supplied to the transport path 31 is fed to the punching point P1 by the forward rotation (clockwise rotation in the drawing) of the transporting roller 30, and the transporting roller 30 is stopped to remove the punched sheet S from the punching point P1. It is possible to perform positioning set (in the state shown in FIG. 3B). After punch holes are formed in the perforated sheet S, the transport roller 30 is reversely rotated (counterclockwise in the figure) to reversely transport the perforated sheet S to the transport path 31 (switchback transport) (FIG. 3D). ) State). That is, the perforated sheet S prepared in the transport path 31 is positioned by feeding the front end portion (perforated end) thereof to the perforation point P1 on the paper platform 10 by the transport roller 30 (state shown in FIG. 3B). . Then, the punched sheet S is nipped by the transport roller 30 in a stopped state at this punching position and held stationary, and punched by the punching blade 21 (the state shown in FIG. 3C). The punched sheet S after the punching process is transported to the transport path 31 by reversing the transport roller 30 (the state shown in FIG. 3D).

  Therefore, a description will be given of a feeding set of the perforated sheet S by the conveying roller 30. For the sheet setting, any of the following methods can be adopted. First, a sheet leading edge detection sensor Se1 (not shown) that detects the sheet leading edge is disposed in the vicinity of the front and rear of the sheet nip point P3 of the conveying roller 30. Then, after the expected time when the leading edge of the sheet reaches the downstream punching point P1 from the signal that the leading edge of the sheet is detected by the sensor Se1, the conveying roller 30 is stopped. As a result, the punched sheet S fed to the transport path 31 is positioned so that a punch hole is formed at a predetermined punching point P1. In this case, the sheet leading edge detection sensor Se1 may be disposed on the punching point P1 on the paper table (precisely, a predetermined amount downstream from the punching point).

  Secondly, a stopper piece (not shown) is disposed at a predetermined position on the paper platform 10 so as to abut and restrict the sheet tip simultaneously with the above-described sheet tip detection sensor Se1. The leading edge of the sheet conveyed toward the punching point P1 by the conveying roller 30 is detected by the sheet leading edge detection sensor Se1, and the conveying roller 30 is rotated until the leading edge of the sheet hits the stopper piece, and then stopped. At this time, resist correction (skew correction) is possible by overrunning the leading edge of the sheet over the stopper piece.

  The features of the punch unit A1 shown in FIGS. 2A and 2B described above will be described. (1) A transport roller 30 that can be rotated forward and backward is disposed in the transport path 31, and a pair of upper and lower sides is formed on the downstream side of the transport roller 30. A paper table 10 and a swing member 20 are provided. Thus, the sheet can be held stationary at this position at the same time as the sheet is fed and set to a predetermined punching position by rotating the transport roller 30 forward and backward while the punched sheet S is nipped by the transport roller 30. Therefore, if the conveying roller 30 and its driving mechanism are controlled with high definition, a punching process can be performed at an accurate punch position.

  In the punch unit A1, (2) the swinging fulcrum P2 of the swinging member 20 to which the punching blade 21 is attached is disposed on substantially the same plane as the sheet plane of the punched sheet S nipped by the conveying roller 30. . As a result, the punching blade 21 attached to the swinging member rotating around the swinging fulcrum P2 acts on the punching sheet supported by the paper platform in a substantially vertical direction to form a punch hole. Therefore, punch holes are formed in the punched sheet S with good hole quality, and at the same time, the punching load can be reduced.

  Further, the punch unit A1 has (3) a nip point P3 of the conveying roller 30, a punching point P1 of the punching blade 21, and a swinging fulcrum P2 of the swinging member 20 on the downstream side of the transporting path 31 for feeding and discharging the punched sheet S. They are arranged in this order. Under such an arrangement, the P1-P2 distance L1 is configured to be larger than the P1-P3 distance L2 (L1> L2). Thereby, when forming a punch hole with the punching blade 21 in the punching sheet S set at the punching point P1, the nip point P3 near the punching point P1 is supported by the conveying roller 30, and the punching blade 21 is far from the punching point P1. It will rock around the rocking fulcrum P2. Accordingly, the punching blade 21 rotates around the swing fulcrum P2 separated from the punching point P1 by a distance L1. Therefore, when the punching blade 21 moves (swings) in a direction substantially perpendicular to the punching sheet S at the punching point P1. A punch hole is drilled. At the same time, the punched sheet S is supported by the conveying roller 30 near the punching point P1. For this reason, the punch holes formed in the punched sheet S have high roundness and high quality.

  The swing member 20 is provided with a flexible guide 25 so that the leading end of the sheet does not abut the punching blade 21 when the sheet S is fed and set to the punching position. The flexible guide 25 is made of an elastic resin film material (for example, Mylar), and guides the upper surface of the sheet so that the sheet curled upward at the tip when the punching blade 21 is at the top dead center does not hit the blade edge 21a ( (Refer FIG. 3 (a), (b)). When the drilling blade 21 is lowered to the bottom dead center, it is elastically bent as shown in FIG. When the punching blade 21 returns from the bottom dead center (FIG. 3C) to the top dead center (FIG. 3D), the sheet S is pressed downward to peel off the sheet from the blade edge 21a. Works.

  The control of the conveying roller 30 and the punch driving unit 22 in the above configuration will be described. This control means is composed of, for example, a control CPU (not shown) of the post-processing apparatus, and its configuration and operation will be described with reference to FIGS. 3 (a) to 3 (d). As shown in FIG. 5A, the conveyance path 31 is connected to a paper discharge port of the image forming apparatus, and the sheets are sequentially carried out at predetermined intervals. The perforated sheet S prepared in the conveyance path 31 is nipped by a conveyance roller 30 that can be rotated forward and backward, and conveyed to the downstream side on the left side of FIG. At this time, the control means (control CPU) rotates the conveying roller 30 in the clockwise direction so as to convey the sheet in synchronization with the conveying means on the upstream side of the path. At this time, the punch driving means 22 positions the drive cam M3 in the initial state (home position; state shown in FIG. 3A), and the punching blade 21 is retracted to the top dead center U1 by the biasing spring 40.

  Therefore, as shown in FIG. 3B, the control means conveys the leading end of the sheet nipped by the conveying roller 30 toward the downstream punching point P1. Then, the sheet leading edge is detected by a sheet leading edge detection sensor Se1 (not shown), and the control unit stops the conveying roller 30 after the expected time for the sheet leading edge to reach a predetermined punching position. Then, the punched sheet S is stopped and set at the punching position, and is held in a state where it is nipped by the conveying roller 30. At this time, the flexible guide 25 guides the leading edge of the sheet along the paper platform 10 so that the leading edge of the sheet does not hit the punching blade 21 when the leading edge of the sheet is curled, for example.

  Next, the control means rotates the drive motor M1 in a predetermined direction after an estimated time when the punched sheet S is set at the punching position. Then, the drive cam M3 attached to the drive rotary shaft M2 connected thereto pushes down the proximal end portion 21b of the drilling blade 21 (state shown in FIG. 3C). As the drive cam M3 rotates, the swing member 20 and the drilling blade 21 attached thereto move from the top dead center U1 to the bottom dead center U2. The cutting edge 21 a of the punching blade 21 passes through the punching sheet S and fits into the blade receiving hole 11 of the paper platform 10. Below the blade receiving hole 11 is provided a waste box 41 for storing perforated paper pieces. At this time, the flexible guide 25 is elastically deformed and is interposed between the sheet S and the swing member 20.

  Thus, the drilling blade 21 attached to the swing member 20 by the rotation of the drive cam M3 moves from the top dead center U1 to the bottom dead center U2, and the top dead center from the bottom dead center U2 with the rotation of the drive cam M3. Return to point U1. At this time, the flexible guide 25 acts to peel off the sheet S from the cutting edge 21a of the punching blade 21 as shown in FIG. Therefore, the control means detects the rotation of the drive cam M3, for example, using a sensor flag, or the rotation of the drive motor M1, for example, using an encoder. Then, at the timing when the swinging member 20 returns to the top dead center (home position), as shown in FIG. 3D, the control means rotates the transport roller 30 in the reverse direction. Then, the punched sheet S in which the punched holes are formed is reversely conveyed to the right side of the drawing and is carried out from the punching position. The perforated sheet S is carried out of the punching unit A1 from the conveyance path 31.

[Modification of First Embodiment]
The punch unit A1 shown in FIGS. 2A and 2B described above is arranged in the order of the nip point P3 of the conveying roller 30, the punching point P1 of the punching blade 21, and the swinging fulcrum P2 of the swinging member 20 in this order on the downstream side of the transport path 31. Although the arrangement is shown, this positional relationship can be laid out as shown in FIG. This figure shows a case where the swing support point P2, the nip point P3, and the punching point P1 are arranged in this order on the downstream side of the transport path 31. The relationship between the P1-P2 distance L1 and the P1-P3 distance L2 is arranged so that L1> L2. As a result, the punched sheet from the transport path 31 can be switched back to the punching position in the same manner as the punch unit A1 shown in FIG. 2A. The same components as those in the unit of FIG.

[Second Embodiment]
Although the above-described punch unit A1 has described the embodiment in which the punched sheet is switched back from the transport path 31 to the punching point P1, the present invention is in the process of passing through the sheet from one end of the transport path 31 to the other end as follows. It is also possible to form punch holes. The punch unit A2 shown in FIGS. 4A and 4B is attached to a pair of upper and lower lower plate members 45, an upper plate member 50, and an upper plate member 50 having a distance d through which the perforated sheet S passes. The punching blade 51, the blade receiving hole 46 formed in the lower plate member 45, the conveying roller 60, and punch driving means 52 that moves the punching blade 51 up and down are configured.

  The lower plate member 45 is composed of a plate-like member that places the perforated sheet S from the conveyance path 61 and guides it from one end (right end in the figure) to the other end (left end in the figure). The lower plate member 45 is provided with blade receiving holes 46 at one place or a plurality of places in the sheet width direction. The upper plate member 50 is opposed to the lower plate member 45 so as to form a small gap d through which the sheet passes, and is formed so as to guide the upper surface of the sheet moving on the lower plate member 45. The upper plate member 50 is pivotally supported by the lower plate member 45 or an appropriate apparatus frame (P2 in the drawing indicates a swing fulcrum) so as to be swingable. A perforating blade 51 is attached to the upper plate member 50 at one place or a plurality of places in the sheet width direction so as to fit the blade receiving hole 46. A cylindrical cutting edge is formed at the distal end 51a of the perforating blade 51, and the base end portion 51b is attached to the upper plate member 50 by fixing means such as caulking, bolting, and welding. Therefore, the punching blade 51 is centered on the swinging fulcrum P2 from the top dead center U1 (FIG. 5A) to the bottom dead center U2 (FIG. 5B) with respect to the punched sheet S supported by the lower plate member 45. It will move up and down. 54 is a flexible guide, which is composed of a resin film material that can be elastically deformed as described above.

  The upper plate member 50 is provided with a biasing spring 53 between the lower plate member 45 or an appropriate apparatus frame, and always biases the upper plate member 50 to the position shown in FIG. The perforating blade 51 attached to the upper plate member 50 by the biasing spring 53 is positioned at the top dead center U1. A drive cam M3 is disposed on the base end portion 51b of the drilling blade 51, and the drive cam M3 is attached to a drive rotating shaft M2 connected to the drive motor M1.

  A first transport roller 60a is disposed on the upstream side of the upper plate member 50 and the lower plate member 45 that are disposed opposite to each other, and a second transport roller 60b is disposed on the downstream side. The first and second transport rollers 60a and 60b are each composed of a pair of rollers in pressure contact with each other, and are connected to a drive motor (not shown).

  FIG. 4A shows a case where punching processing is performed on the leading end side of the sheet sent to the conveyance path 61 in the above-described configuration, and FIG. 4B shows a case where punching processing is performed on the trailing end side of the sheet. In the configuration of FIG. 5A, the sheet nip point P3 of the first conveying roller 60a, the punching point P1 of the punching blade 51, and the swinging fulcrum P2 of the upper plate member 50 are arranged in this order. The relationship with the P1-P3 distance L3 is set so that L1> L3. When the punching process is performed on the trailing edge of the sheet in FIG. 7B, the swing support point P2 of the upper plate member 50, the punching point P1 of the punching blade 51, and the sheet nip point P4 of the second conveying roller 60b are arranged in this order. The relationship between the P1-P2 distance L1 and the P1-P4 distance L4 is set so that L1> L4.

  In the configuration of FIG. 4A, the control means (for example, the control CPU of the post-processing apparatus) conveys the punched sheet S prepared in the transport path 61 toward the downstream punching point P1 by the first transport roller 60a. (State of FIG. 5A). When the leading edge of the sheet is fed to a predetermined punching position, the control unit stops the first transport roller 60a and holds the punched sheet S stationary by the first transport roller 60a. Therefore, the drive motor M1 is rotated and the drilling blade 51 is moved from the top dead center U1 to the bottom dead center U2 by the drive cam M3 (state shown in FIG. 5B). Then, a punch hole is formed in the front edge of the perforated sheet S. After the punching process, the control unit restarts the first transport roller 60a and transports the punched sheet S toward the second transport roller 60b on the downstream side. At the same time, the second conveying roller 60b is rotated to carry the perforated sheet to the downstream side of the roller (state shown in FIG. 5C).

  In the configuration of FIG. 4B, the control unit conveys the perforated sheet S prepared in the conveyance path 61 from the first conveyance roller 60a to the second conveyance roller 60b (state of FIG. 6A). Then, when the trailing edge of the sheet is detected and the trailing edge of the sheet reaches a predetermined punching position, the second conveying roller 60b is stopped and the sheet is positioned at the punching point P1. Then, the punch driving motor M1 is rotated similarly to the punched sheet S held stationary by the second conveying roller 60b, and the punching blade 51 is moved from the top dead center U1 to the bottom dead center U2 by the drive cam M3 (FIG. 6 ( b)). After the punch holes are formed in the punched sheet S, the second transport roller 60b is restarted to carry the punched sheet S to the downstream side of the second transport roller 60b (state shown in FIG. 6C).

  When the punching process is performed on the leading end side of the punched sheet S prepared in the transport path 61 as described above, the punching process is performed on the sheet held at the punching position by the first transport roller 60a. When the punching process is performed on the rear end side of the punched sheet S, the punching process is performed on the sheet held at the punching position by the second conveying roller 60b. At this time, the distance L3 or L4 between the sheet nip point P3 or P4 of the roller holding the sheet at the punching position and the punching point P1 is between the swing fulcrum P2 of the upper plate member 50 and the punching point P1. It is set to be smaller than the distance L1 (L1> L3, L1> L4).

The perspective view which shows the whole structure of the punch unit concerning this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the punch unit which shows 1st Embodiment, (a) shows a standby state, (b) is an expanded sectional view of a perforation part, (c) shows the expanded sectional view of a connection part. The 1st Embodiment of a punch unit is shown, (a) is the whole explanatory drawing of the piercing | piercing state, (b) is an expansion explanatory drawing of the piercing | punching part. FIGS. 2A and 2B are explanatory diagrams of an operation state, in which FIG. 2A is an initial state in which a perforated sheet is carried in, FIG. 2B is a state diagram in which the perforated sheet is conveyed and set at a perforation position, and FIG. FIG. 6D is a state diagram for carrying out the punched sheet. It is a whole block diagram which shows 2nd Embodiment of a punch unit, (a) is explanatory drawing of the aspect which perforates a sheet | seat front end, (b) is explanatory drawing of the aspect which perforates a sheet | seat rear end. . 4A is an explanatory diagram of an operation state in the configuration of FIG. 4A, FIG. 4A is an explanatory diagram of a state where a sheet is fed to a punching position, FIG. 4B is an explanatory diagram of a punching state, and FIG. It is explanatory drawing of the sheet | seat carrying-out state. FIG. 4B is an explanatory diagram of an operation state in the configuration of FIG. 4B, where FIG. 4A is an explanatory diagram of a state where a sheet is fed to a punching position, FIG. 4B is an explanatory diagram of a punching state, and FIG. It is explanatory drawing of the sheet | seat carrying-out state. Explanatory drawing which shows the modification of the unit (1st Embodiment) of FIG. 2A.

Explanation of symbols

A1 Punch unit 10 Paper mount (lower plate member)
11 Blade receiving hole (die)
12 Bearing piece 20 Oscillating member (upper plate member)
20a Bearing portion 21 Drilling blade 21a Tip end 21b Base end portion 21c Fixing member 22 Punch driving means 23 Hinge pin 25 Flexible guide 30 Conveying roller 40 Biasing spring 41 Waste storage box 45 Lower plate member (second embodiment)
46 Blade receiving hole 50 Upper plate member (second embodiment)
51 punching blade 52 punch driving means 53 biasing spring 60 transport roller 61 transport path M1 drive motor M2 drive rotating shaft M3 drive cam

Claims (6)

A conveyance roller capable of forward and reverse rotation that nips sheets sequentially supplied from the sheet conveyance path and feeds and discharges them to a downstream punching processing position;
A paper platform for placing and supporting the perforation edge of the sheet fed by the conveying roller;
A perforation blade for punching a punch hole in a perforation edge of a sheet disposed above the paper table and held by the conveying roller;
A blade receiving hole provided on the paper table and fitted to the perforating blade;
Punch driving means for vertically moving the drilling blade between a top dead center and a bottom dead center;
Control means for driving and controlling the roller pair and punch driving means;
With
The perforating blade is integrally attached to (1) a swinging member extending in the transport direction of the sheet fed by the transporting roller, and (2) the swinging member has one end at the paper platform or (3) The sheet feeding direction distance between the swinging fulcrum of the swinging member and the punching point of the punching blade is the sheet nip point of the conveying roller. Is set to be larger than the distance in the sheet feeding direction between the punching point of the punching blade and
The punch driving means is configured to swing the swinging member about the swinging fulcrum between a top dead center and a bottom dead center,
The control means rotates the pair of rollers forward while the swinging member is located at the top dead center to feed the sheet to the punching processing position, and swings the sheet while the sheet is held stationary by the pair of rollers. The member is moved to the bottom dead center and punched, and then the roller pair is reversely rotated while the swinging member is returned to the top dead center to carry out the sheet from the punching position. Sheet punching device characterized by the above. A pair of upper and lower upper plate members and a lower plate member having an interval through which the sheet enters,
A perforating blade disposed on the upper plate member;
A blade receiving hole disposed in the lower plate member;
Punch driving means for vertically moving the drilling blade between a top dead center and a bottom dead center;
A first transport roller disposed on the upstream side of the upper plate member and the lower plate member, and a second transport roller disposed on the downstream side;
Control means for controlling the punch driving means and the first second conveying roller;
With
The drilling blade is (1) integrally attached to the upper plate member, (2) the upper plate member is pivotally supported at one end by the lower plate member or an appropriate apparatus frame, and (3) the above The distance in the sheet feeding direction between the swing fulcrum of the upper plate member and the punching point of the punching blade is such that at least one sheet nip point of the first and second transport rollers and the punching point of the punching blade Is set to be greater than the distance in the sheet feeding direction between
The punch driving means is configured to swing the upper plate member around the swing fulcrum between a top dead center and a bottom dead center,
The control means rotates the first conveying roller in a state where the upper plate member is located at the top dead center to feed the sheet to the punching processing position, and the sheet is conveyed to the first conveying roller or the second conveying roller. The upper plate member is moved to the bottom dead center in a state of being held stationary at the bottom dead center and then punched, and then the second transport roller is rotated while the upper plate member is returned to the top dead center to punch the sheet. A sheet punching device, characterized in that the sheet punching device is configured to be carried out of the sheet. The perforating blade is formed in a cylindrical shape, and is fixed integrally to the swinging member or the upper plate member such that a tip blade edge protrudes toward the paper platform or the lower plate member. The sheet punching device according to claim 1 or 2. The swinging member is constituted by a plate-shaped guide member that forms a small gap between the swinging member and the paper platen, and the upper plate member is formed between the lower plate member and the paper platen or lower plate member. The sheet punching device according to any one of claims 1 to 3, wherein an upper surface of a sheet fed and discharged along the guide is guided. 5. The resin sheet or other flexible guide having elasticity so that the sheet does not interfere with the perforating blade attached to the swinging member or the upper plate member. The sheet punching device according to any one of the items. The swing member or the lower plate member includes a biasing means for biasing to the top dead center side,
The drive means includes a cam member that presses down the drilling blade attached to the swinging member or the lower plate member against the biasing means when swinging the swinging member or the lower plate member toward the bottom dead center side. The sheet punching device according to any one of claims 1 to 5, wherein the sheet punching device is provided.

Images