JP2009172744A - Paper sheet cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper sheet cutting device, capable of providing secure cutting constantly, and providing cutting in excellent cutting quality without causing an overload on a cutting blade in cutting paper sheets. <P>SOLUTION: The device is provided with: a paper rest to support sheets; a press means to press and hold sheets on the paper rest; a movable cutting blade movable in the vertical cutting direction to the sheets on the paper rest; a fixed cutting blade disposed on the paper rest side to slide in contact with the movable cutting blade; and a drive motor to move the movable cutting blade in the vertical cutting direction. The fixed cutting blade is composed to be position-movable roughly in the perpendicular direction to the cutting direction in slide contact with the movable cutting blade. The fixed cutting blade is provided with an energization spring to elastically energize it toward the movable cutting blade. The fixed cutting blade is position-regulated in the perpendicular direction to cutting by pressure to press the sheets onto the paper rest by means of the press means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cutting device that cuts paper sheets held on a paper platform, for example, aligns sheets formed with an image by an image forming apparatus in a bundle shape, and sets them in a predetermined cutting line. The present invention relates to an improvement of a cutting apparatus that performs cutting with a printer.

  In general, this type of cutting apparatus is widely used as an apparatus for setting paper sheets on a paper table and cutting a predetermined portion thereof. For example, a sheet fed from a printer device or the like is aligned in a bundle and bound in a bookbinding manner, and a trimming device that trims and aligns the peripheral edge of the bound sheet bundle, or a sheet from an image forming device is halved, It is known as a cutting device that cuts in half.

  Conventionally, as such a cutting apparatus, for example, as disclosed in Patent Document 1, there are many cutting apparatuses that set a single sheet on a table and cut the sheet, and as disclosed in Patent Document 2. 2. Description of the Related Art A cutting apparatus that sets a single sheet in a bundle and cuts the sheet at a time is known. And as a cutting method, when cutting with a cutting blade (rotary blade) that moves from one end of the sheet to the other end as in Patent Document 1, and flat plate cutting from above the bundle-shaped sheet as in Patent Document 2 What cuts when a blade (guillotine blade) descends is known.

  Therefore, as in the above-mentioned Patent Document 1, in the mechanism for cutting by cutting one sheet cutting blade (rotating blade) from one end of the sheet to the other end, the cutting blade can be cut by cutting a plurality of sheet bundles at once. There is a known problem of meandering when the cutting blade is run with a force that surpasses the shearing force. For this reason, conventionally, such a rotary blade cutting mechanism is employed when cutting one or a small number of sheets. Accordingly, it is impossible to cut a large number of sheet bundles with such an apparatus.

  Further, when cutting a large number of sheet bundles at once with a cutting blade (guillotine blade) that moves up and down in the thickness direction as in Patent Document 2, it is necessary to increase the shearing energy required for cutting. This is because the sheet bundle is cut with its striking force by lowering the cutting blade vigorously at a high speed. In this case, the apparatus must be constructed robustly and the drive device must be large.

Therefore, Patent Documents 3 and 4 propose a device for miniaturizing a drive mechanism for moving a plate-shaped cutting blade up and down. In this document, it is proposed that the cutting blade is oscillated while the plate-like cutting blade is supported by a pair of left and right oscillating arms. Thus, by swinging the cutting blade that moves up and down with a pair of arm members and cutting, the impact on the apparatus when the cutting blade reaches the bottom dead center (cutting end posture) can be reduced. Therefore, it is not necessary to make the device robust, and the size and weight can be reduced. Further, Patent Document 4 proposes that the cutting force is reduced by varying the lengths of the pair of left and right swing arms so that the cutting blade is inclined and cut with respect to the sheet surface.
Japanese Patent Laid-Open No. 10-138194 JP 2003-71780 A Japanese Utility Model Publication No. 47-8308 Japanese Utility Model Publication No. 52-1034889

  As described above, a guillotine type cutting disclosed in the above-mentioned Patent Document 2 is known when a plurality of paper sheets are stacked and held on a paper table and cut. Similarly to such a cutting apparatus, apparatuses for cutting a paper sheet from one end to the other end of a cutting line while swinging a flat plate-shaped cutting blade with an arm member are also known from Patent Documents 3 and 4 listed above.

  In any of the above cutting apparatuses, it is necessary to provide a blade receiving member on the paper platform side or a fixed cutting blade with respect to the movable cutting blade that moves up and down in the cutting direction. The blade receiving member is made of a soft material such as a rubber material so as not to damage the cutting edge of the movable cutting blade, and the fixed cutting blade is provided with a cutting edge which is in sliding contact with the cutting edge of the movable cutting blade.

  Conventionally, in such a cutting mechanism that sandwiches and cuts a sheet bundle with a movable cutting blade and a fixed cutting blade, if there is a gap between the two blade edges, cutting becomes impossible and the paper sheet is caught between the blade edges, resulting in malfunction. (Cutting jam). In addition, there is a known problem that when a paper sheet is cut with a gap between the blade edges, the fracture surface is not uniform and the cutting quality is poor.

  For this reason, conventionally, a mechanism has been adopted in which the movable cutting blade is urged by a spring or the like in the direction orthogonal to the cutting and is pressed against the fixed cutting blade. However, when cutting a sheet bundle, a large force acts in the direction orthogonal to the cutting, so that the movable cutting blade may escape from the fixed cutting blade and create a gap between the cutting edges. Therefore, conventionally, when the movable cutting blade is urged against the fixed cutting blade, it has been necessary to urge the movable cutting blade with a strong urging force that overcomes the escaping force (drag) generated during sheet cutting. There was a problem.

  Therefore, when the movable cutting blade and the fixed cutting blade are brought into close sliding contact with each other, the inventor positions the fixed cutting blade disposed on the paper platform side by pressing with a biasing spring, and in this state the paper sheet is cut during cutting. The idea is that the fixed blade is positioned and fixed by pressing means that presses and holds the sheet on the paper table.

In the present invention, when cutting a paper sheet with a movable cutting blade and a fixed cutting blade along a predetermined cutting line, the cutting blade is not overloaded, and reliable cutting and cutting with excellent cutting quality are always performed. The main issue is to provide a paper sheet cutting device that can be used.
Another object of the present invention is to provide a paper sheet cutting device that has a simple structure and can be provided at low cost when the movable cutting blade and the fixed cutting blade are brought into close sliding contact with each other.

  In order to achieve the above object, the present invention employs the following configuration. An apparatus for cutting a paper sheet along a predetermined cutting line, a paper table for supporting the sheet, a pressing means for pressing and holding the sheet on the paper table, and a sheet on the paper table On the other hand, a movable cutting blade that can move in the vertical cutting direction, a fixed cutting blade that is disposed on the paper platform side and is in sliding contact with the movable cutting blade, and a drive motor for moving the movable cutting blade in the vertical cutting direction The fixed cutting blade is configured to be slidable to the movable cutting blade and movable in a direction substantially perpendicular to the cutting direction. The fixed cutting blade is elastically biased toward the movable cutting blade. An urging spring is provided, and the position of the fixed cutting blade in the cutting orthogonal direction is regulated by a pressing force that presses the sheet onto the paper table by the pressing means.

  The fixed cutting blade (28) is integrally formed by being fixed to the paper platform (15) or fixed to a part of the paper platform, and the pressing means (20) includes the fixed cutting blade (28). ) And a pressure member (21) for pressing the sheet is disposed on a paper table integrated with the sheet.

  The pressing means (20) includes a pressure member (21) for pressing a sheet on the paper table, a pressure spring (18) for urging the pressure member, and the pressure member as a paper table. The fixed cutting blade (28) is configured to be retracted above (15), and the fixed cutting blade (28) is configured to move the movable cutting blade by a biasing force of the biasing spring (16) when releasing the pressure of the pressing member. (25) is pressed and positioned, and is held by the urging force of the pressure spring when the pressure member is pressed.

  The cutting blade is connected and supported by a pair of driving rotary members arranged at a distance in the cutting line direction of the sheet, and the driving rotary member is connected to the drive motor and moves the cutting blade in the vertical cutting direction. The pressure release means is configured to retract the pressure member from the fixed cutting blade by rotating the movable cutting blade in the anti-cutting direction with the rotation driving member.

  The urging spring that urges the fixed cutting blade in the cutting orthogonal direction and the pressure spring that presses the pressure member against the sheet on the paper table are the urging force against the sheet on the paper table. It is set so that the acting force in the cutting orthogonal direction by the pressure spring is larger than the acting force in the cutting orthogonal direction by the spring.

  In the present invention, a pair of drive rotation members are provided on an appropriate apparatus frame at a distance in the cutting line direction of the sheet bundle, and a phase difference is formed on the drive rotation members so that the rotation angles are different from each other by a predetermined angle. Since it is connected to a drive motor and at least one of the drive rotating members and the cutting blade are connected so as to be freely movable in a direction perpendicular to the up and down cutting direction, the following effects can be obtained.

  The cutting blade for cutting the sheet bundle is supported by a pair of driving rotary members, and simultaneously moved up and down in the cutting direction by the driving rotary members. Therefore, since the cutting blade support mechanism and the vertical drive mechanism are composed of the same member (drive rotation member), the two blades do not cushion each other, and the cutting blade always performs a smooth cutting operation.

  Further, since the phase difference is formed so that the rotation angle of the pair of driving rotating members is different by a predetermined angle, the shearing angle of the cutting blade for cutting the sheet bundle is changed according to the cutting of the sheet bundle. For example, it is possible to cut with a large shear angle at the beginning of cutting and with a small shear angle at the end of cutting. In this case, since at least one of the drive rotating member and the cutting blade are movably connected in a direction perpendicular to the vertical cutting direction, the apparatus does not increase the stroke of the cutting blade when changing the shear angle by the cutting blade. Can be miniaturized.

  The present invention will be described in detail below based on the preferred embodiments shown in the drawings. FIG. 1 is a perspective view showing the overall configuration of a sheet bundle cutting device (trimmer unit) according to the present invention, and FIG. 2 is a front view thereof. FIG. 3 is a rear view of the apparatus of FIG. FIG. 4 is a diagram illustrating the configuration of the cutting edge press means, and FIGS. 5 and 6 are diagrams illustrating the cutting operation of the plate-shaped cutting blade in the apparatus of FIG.

  A paper sheet bundle cutting apparatus (trimmer unit) A shown in FIG. 1 includes a paper table 15 for loading and supporting paper sheets P, a press means 20 for pressing and holding the paper sheets P on the paper table, and a paper sheet. The movable cutting blade 25 cuts the leaves P along a predetermined cutting line CL, and a fixed cutting blade 28 provided integrally with the paper mount 15. These paper table 15, pressing means 20, and movable cutting blade 25 are attached to an apparatus frame (base plate described later) 10. Each configuration will be described below.

[Device frame]
The apparatus frame 10 is equipped with a paper table 15, a movable cutting blade 25, and a pressing means 20, and is made of, for example, a steel plate having an appropriate thickness for mechanical strength according to the cutting of the paper sheet P. The apparatus frame 10 shown in FIG. 1 is composed of a flat base plate arranged in a direction orthogonal to the paper surface of the paper sheet P (the Z direction shown in FIG. 1; the vertical direction). The flat base plate (apparatus frame) 10 is provided with a cutting opening 12 for feeding and discharging the paper sheet P, and a direction in which a paper mount 15 (to be described later) is orthogonal to the cutting opening 12 (the Y direction shown in the figure). ). The base plate 10 has a pair of left and right drive rotation members 13d and 13f (hereinafter, collectively referred to as reference numeral 13) that support the movable cutting blade 25 on the front side, and a pair of drive rotation members on the back side. A transmission chain 29 for synchronously rotating the member 13 is disposed (details will be described later).

[Configuration of the paper platform]
A paper platform 15 having a fixed cutting blade 28 is attached to the cutting opening 12 of the base plate 10 described above. The paper platform 15 is configured by a placement member such as a tray that holds a paper sheet (or a bundle of paper sheets) to be cut in a predetermined posture. The shape may be a shape that supports the entire paper sheet P, or a shape that partially supports the cutting edge of the paper sheet P as shown in the figure. As shown in FIG. 4, the illustrated paper platform 15 is composed of a beam-shaped member having a predetermined length along a cutting line CL. The beam-shaped member has a fixed cutting blade 28 at a cutting edge along the cutting line CL. It is attached integrally. That is, as shown in FIG. 7, a step 15w is provided along the cutting edge CL on the paper platform 15, and a plate-like fixed cutting blade 28 is embedded in the step 15w. The fixed cutting blade 28 is made of a tough material such as carbon steel, cemented carbide or stainless steel.

  A pair of left and right guide members 17R and 17L (see FIG. 4) are integrally attached to the paper table 15 with bolts or the like along a cutting line CL. A guide groove 17g is formed in the pair of left and right guide members 17R and 17L so as to guide a pressurizing plate 21 described later so as to be movable up and down.

[Fixing cutting blade positioning mechanism]
Thus, the fixed cutting blade 28 integrally attached to the paper platform 15 is configured separately from the base plate 10. The configuration will be described with reference to FIG. 7 (sectional view) and FIG. 8 (exploded view). The paper table 15 is integrally provided with a fixed cutting blade 28 and a pair of guide members 17R and 17L (hereinafter referred to as “paper table assembly 15”). The paper table assembly 15 is fitted and supported in the cutting opening 12 of the base plate 10 so as to be movable in the cutting orthogonal direction (Y direction shown in FIG. 7). In addition, a movable cutting blade 25 is supported on the drive rotating members 13d (drive side) and 13f (driven side) rotatably supported by the base plate 10. The movable cutting blade 25 is composed of a blade receiving holder 25h and a blade edge member 25c, and is fitted and supported on the transmission pin 13p of the drive rotating member 13 via a bearing sleeve 13s.

  Therefore, the above-described guide members 17R, 17L and the movable cutting blade 25 are sandwiched between the base plate 10 and the pressing member 19. A pressing member 19 (a pair of left and right stay members in the figure) is fixed to the base plate 10 with bolts or the like at a predetermined interval Ld. Guide members 17R and 17L and a movable cutting blade 25 are sandwiched between the base plate 10 and the pressing member 19 (see FIG. 7). At this time, an urging means 16 composed of a compression spring is provided between the base plate 10 and the guide members 17R and 17L so as to press the guide members 17R and 17L against the movable cutting blade 25. Therefore, the fixed cutting blade 28 integral with the guide members 17R and 17L is always urged by the movable cutting blade 25. The biasing means 16 is not limited to the illustrated spring, and may be constituted by a spacer made of an elastic member such as sponge or rubber.

  In the above-described configuration, the pressure plate 21 is disposed between the base plate 10 and the movable cutting blade 25. As shown in FIG. 10, a flat plate-like pressure plate 21 is sandwiched between the base plate 10 and the movable cutting blade 25, and the lower end surface 21p of the pressure plate 21 presses and supports the sheet surface on the paper table. It is arranged at the position to do. The guide groove 17g formed in the above-described guide members 17R and 17L supports the pressure plate 21 so as to be movable up and down. A bent piece 10r is formed on the base plate 10, and a pressure spring 18 presses and presses the pressure plate 21 downward in FIG. 9B to the bent piece 10r. Accordingly, the pressure plate 21 disposed between the base plate 10 and the movable cutting blade 25 is configured such that its lower end surface 21p presses the paper sheet surface on the paper table 15.

  Note that the pressure plate 21 is moved by the vertical movement of the movable cutting blade 25 to the upper position of the paper table 15 and retreats to a position away from the sheet surface, and the pressure plate 18 receives the action of the pressure spring 18. It moves up and down between the operating positions for pressing the paper sheet surface 15. Therefore, the upper end flange portion 25f of the movable cutting blade 25 and the engagement piece 21k of the pressure plate 21 are configured to engage with each other. Therefore, the movable cutting blade 25 and the drive rotating member 13 that moves up and down the same constitute a pressure releasing means.

  Next, the relationship between the fixed cutting blade 28 and the movable cutting blade 25 will be described with reference to the operation state explanatory diagram shown in FIG. As will be described later, the movable cutting blade 25 is supported by a pair of left and right drive rotation members 13d and 13f, and moves up and down with respect to the paper table 15 by the rotation. Therefore, in the state shown in FIG. 6A where the movable cutting blade 25 stands by above the paper platform, the pressure plate 21 interlocked with the movable cutting blade 25 stands by at the non-operating position (standby position). In this state, the paper sheet P is inserted and set on the paper table 15. At this time, the fixed cutting blade 28 integral with the paper platform 15 is elastically pressed against the movable cutting blade 25 by the spring force (elastic force) of the biasing means 16. That is, the guide members 17R and 17L integrated with the fixed cutting blade 28 are elastically pressed by the urging means 16 (the illustrated one is a compression spring) to the blade holder 25h of the movable cutting blade 25, and the movable cutting blade 25, the fixed cutting blade 28, and the like. Are positioned in close sliding contact with each other.

  Therefore, after the paper sheet P is fed and set on the paper platform 15, when the drive rotating member 13 is rotated in a predetermined direction, the movable cutting blade 25 descends from the top dead center p1. When the movable cutting blade 25 is lowered by a predetermined amount, the pressure plate 21 is also lowered toward the sheet surface, and the upper end flange portion 25f of the movable cutting blade 25 is separated from the engagement piece 21k of the pressure plate 21. Then, the lower end surface 21p of the pressure plate 21 presses the sheet surface by the action of the pressure spring 18. This state is shown in FIG. 9B, and the pressure plate 21 presses the paper platform 15 from above by the action of the pressure spring 18. Therefore, the fixed cutting blade 28 provided on the paper platform 15 is positioned at a position where it is slidably contacted with the movable cutting blade 25 by the urging means 16, and is held by the pressure plate 21 in this state. Therefore, when cutting the paper sheet P with the movable cutting blade 25, the fixed cutting blade 28 does not escape even if a force in the direction of the arrow shown in the drawing acts due to the shearing force. As a result, the urging force of the urging spring that urges the fixed blade toward the cutting blade can be set small, and the apparatus can be miniaturized.

  The spring force of the pressure spring 18 acting on the pressure plate 21 and the biasing means 16 acting on the fixed cutting blade 28 is set so that the pressure spring side becomes large. That is, when the pressure plate 21 is in the non-operating position, the fixed cutting blade 28 moves to a position where it comes into contact with the movable cutting blade 25 by the spring force (elastic force) of the urging means 16, but the pressure plate 21 is in the operating position. In some cases, the spring force is set so that the pressure spring 18 is held at that position and does not move easily.

[Configuration of movable cutting blade]
The configuration of the movable cutting blade 25 described above will be described with reference to FIGS. As described above, the pair of drive rotation members 13d and 13f are arranged on the base plate 10 at positions spaced apart along the cutting line CL. As shown in FIG. 4, the drive rotating member 13 has a pair of rotating shafts 13 x and 13 y supported by the base plate 10 at positions separated by a distance L in the cutting line CL direction. Drive rotation members 13d and 13f such as arm members and eccentric cams are fixed to the pair of left and right rotation shafts 13x and 13y. Each drive rotary member 13 is provided with a transmission pin (may be a cam follower) 13p at a position different from the rotary shafts 13x, 13y, and a movable cutting blade 25 is supported by the transmission pin 13p. Accordingly, when the pair of left and right drive rotation members 13d and 13f are rotated about the rotation shafts 13x and 13y, the movable cutting blade 25 moves up and down while drawing an arc along the base plate 10.

  As shown in FIG. 3, a drive motor M is connected to the rotation shafts 13x and 13y of the drive rotation members 13d and 13f. A sprocket 30 is provided integrally with the rotary shafts 13x and 13y on the back side of the base plate 10, and a transmission chain 29 is bridged between the left and right sprockets 30a and 30b. A drive motor M is connected to the sprocket 30a of the drive rotating member 13d located on the drive side via a reduction gear 31.

[Configuration of cutting blade]
As shown in FIG. 1, the movable cutting blade 25 is composed of a plate-shaped blade edge member 25c and a blade receiving holder 25h. The blade holder 25h is formed of a member having mechanical strength that can withstand the drag generated by cutting the sheet bundle, and a concave groove 25w for mounting the blade member 25c is formed at the lower edge thereof. Reference numeral 25b denotes a stay for reinforcement, which is integrally fixed to the blade holder 25h along the cutting line CL. A blade member 25c is attached to the recessed groove 25w with an adhesive tape or the like. The blade member 25c is inclined at a predetermined angle in the direction of the cutting line CL so as to gradually cut the paper sheet P from one end to the other end. The illustrated blade edge member 25c is inclined at an angle α shown in FIG. 5A within a range of 3 degrees to 15 degrees.

  Next, the connection relationship between the drive rotating members 13d and 13f and the movable cutting blade 25 shown in FIG. 5 will be described. As described above, the pair of left and right drive rotation members 13d and 13f are rotated at the same angular velocity in synchronization with the rotation of the drive motor M. At this time, the illustrated apparatus interlocks the drive-side rotary shaft 13x connected to the drive motor M and the driven-side rotary shaft 13y connected to the rotary shaft 13x by the transmission chain 29 so as to form a phase difference θ. It is. That is, the drive rotation member 13f of the driven side rotation shaft 13y is configured to rotate with a delay of the angle θ shown in FIG. 5A with respect to the drive rotation member 13d of the drive side rotation shaft 13x. Due to this phase difference (angle θ), the inclination angle α (shear angle) between the movable cutting blade 25 and the sheet surface is the angle α1 in the standby state in FIG. 5A and the angle in the shear start state in FIG. With α2, the latter angle is large (α1 <α2). Accordingly, it is possible to increase the shear angle for cutting the paper sheet without increasing the vertical stroke of the movable cutting blade 25 (without increasing the size of the apparatus). Then, with the progress of the paper sheet cutting, the angle α3 in the middle of cutting in FIG. 6A and the angle α4 at the end of cutting in FIG. 6B are substantially the same as the angle α1 at the start of cutting. (Α1≈α2≈α3≈α4).

  As described above, the drive-side rotary shaft 13x and the driven-side rotary shaft 13y rotate at the same peripheral speed, and the phase difference between the drive-side drive rotary member 13d and the driven-side drive rotary member 13f attached thereto. θ is formed. In this relationship, at least one of the driving side and the driven side needs to freely connect the movable cutting blade 25 and the driving rotary member 13 in a direction perpendicular to the vertical cutting direction (if there is no such movement, the two driving rotary members Will buffer each other and their movement will be locked). Therefore, in the illustrated example, the driven rotary member 13f and the movable cutting blade 25 are fitted and supported in a freely movable manner by the long hole 11 (see FIG. 2).

  The above-mentioned movable cutting blade 25 is configured to cut the cutting blade while moving it in the cutting line CL direction when descending from above to cut the paper sheet P. The moving direction of the movable cutting blade 25 is reversed between the start of cutting and the end of cutting. That is, as shown in FIG. 5 (a), the movable cutting blade 25 stands by at the point p1 shown in the figure where the drive side rotary member 13d is located at the top dead center, and pressurizes at the point p2 shown in the figure rotated counterclockwise by a predetermined angle. The plate 21 presses the paper surface. Then, cutting is started at the point p3 in the figure, and cutting is finished at the point p5 (bottom dead point) in the figure.

  Accordingly, the movable cutting blade 25 that pivots around the rotation shafts 13x and 13y starts cutting the sheet bundle between the top dead center p1 and the inflection point p4 of the arc locus, and exceeds the inflection point p4. The cutting is set to end at the bottom dead center p5. Since the cutting start point of the maximum allowable sheet bundle is set between the top dead center p1 and the inflection point p4 in this way, the movable cutting blade 25 moves in the direction of the cutting line CL when descending from the standby position to the cutting position. First, it moves to the left side, and then moves to the right side (after exceeding the inflection point P2). As a result, the cutting edge of the movable cutting blade 25 descends while moving the sheet bundle on the paper platform 15 to the left at the start of cutting, and after exceeding the inflection point p4, the cutting edge descends while moving to the right. A sheet bundle will be cut.

  As described above, the movable cutting blade 25 moves forward (left side in FIG. 4) while entering the paper bundle while being pushed, so that the cutting depth can be secured even for a soft paper bundle. . At the end of cutting, the movable cutting blade 25 finishes cutting while moving to the right in FIG. For example, when cutting a soft and soft material with a flat blade-shaped knife blade, cutting the paper sheet with the movable cutting blade 25 is easy to cut in the depth direction by pushing the blade edge forward at the start of cutting. It is understood from the fact that when the cutting is finished, the cut surface is adjusted by cutting the blade edge backward.

  The operation of the movable cutting blade 25 configured as described above will be described with reference to FIGS. FIG. 5A shows a state where the movable cutting blade 25 is retracted to the upper standby position (cutting standby state). At this time, the drive rotation member 13d located on the drive side is located at the top dead center p1, and the movable cutting blade 25 and the pressure plate 21 are retracted upward from the sheet surface on the paper platform 15. In this standby state, the sheet bundle is fed and set on the paper platform 15. Next, when the drive motor M is activated and the drive rotating members 13d and 13f are rotated counterclockwise, the movable cutting blade 25 gradually moves downward from the top dead center p1, and the pressure plate 21 engaged therewith. Also descends. When the drive rotating member 13d reaches the point p2 in the figure, the lower end surface 21p of the pressure plate 21 presses the sheet surface. Next, when the drive rotation members 13d and 13f further move to the point p3 in the figure, the movable cutting blade 25 starts cutting the sheet surface.

  While the drive rotating member 13d moves from the point p3 shown in FIG. 5B to the point p4, the movable cutting blade 25 moves downward while moving to the left side of the drawing, and the blade edge member 25c enters inside while pushing the sheet bundle. To do. Next, when the drive rotation members 13d and 13f exceed the point p4 (inflection point) in FIG. 6A, the movable cutting blade 25 moves deeply into the sheet bundle while moving to the right side of the drawing, and cuts. Become. When the movable cutting blade 25 reaches the bottom dead center p5 (the state shown in FIG. 6B), the cutting of the sheet bundle is completed.

[Moveable cutting blade replacement mechanism]
The movable cutting blade 25 configured as described above is supported (mounted) on the base plate (device frame) 10 via the drive rotation members 13d and 13f. At this time, the drive motor M is disposed so as to face the front side of the apparatus. At the same time, the movable cutting blade 25 is arranged so that the blade tip is inclined with respect to the sheet surface on the paper table 15, and this inclination is low on the apparatus front side with respect to the sheet surface and gradually increases on the rear side. Is formed. This is for pulling out the movable cutting blade 25 to the front side of the apparatus. The cutting blade is wide on the front side and narrow on the rear side, so that the replacement is easy and safe. It is.

[Different configurations of movable cutting blades]
In addition, in this invention, it is also possible to comprise a movable cutting blade as follows. The above-described movable cutting blade 25 shown in FIG. 2 shows a case where the movable cutting blade 25 descends while being swung by the pair of left and right drive rotating members 13d and 13f. It may be configured to move up and down vertically. The same components as those in FIG. 2 are denoted by the same reference numerals and description thereof is omitted, but the apparatus shown in FIG. 11 is vertically fitted by fitting the movable cutting blade 25 into guide grooves 17g formed in the left and right guide members 17R and 17L. It is supported to move up and down in the direction. The pair of left and right drive rotating members 13d and 13f have the transmission pin 13p fitted in the long hole bearings 14R and 14L, respectively. Therefore, the movable cutting blade 25 moves up and down only in the vertical direction by the drive rotating members 13d and 13f that move in a circular arc with this bearing structure. Other configurations are the same as those in FIG.

[Configuration of Image Forming Apparatus]
Next, the configuration of the post-processing apparatus and the image forming apparatus provided with the above-described sheet bundle cutting apparatus A will be described with reference to FIG. As the image forming apparatus B, various structures such as a copying machine, a printer, and a printing machine can be adopted, and an electrostatic printing apparatus is illustrated. In the image forming apparatus B, a paper feed unit 52, a printing unit 53, a paper discharge unit 54, and a control unit are built in a casing 51. A plurality of cassettes 52 a corresponding to the sheet size are prepared in the sheet feeding unit 52, and a sheet having a size designated by the control unit is fed out to the sheet feeding path 55. The sheet feeding path 55 is provided with a registration roller 55a, and after the sheets are aligned at the leading edge, the sheet is fed to the downstream printing unit 53 at a predetermined timing.

  The printing unit 53 is provided with an electrostatic drum 53a. Around the electrostatic drum 53a, a print head 53b, a developing device 53c, a transfer charger 53d, and the like are arranged. The print head 53b is composed of, for example, a laser light emitter, and forms an electrostatic latent image on the electrostatic drum 53a. A toner ink is attached to the latent image by the developing device 53c, and printing is performed on the sheet by the transfer charger 53d. . This print sheet is fixed by the fixing device 56 and carried out to the paper discharge path 54b. A paper discharge port 58 and a paper discharge roller 59 formed in the casing 51 are disposed in the paper discharge unit 54. The print sheet on which the image is formed in this manner is carried out from the paper discharge port 58 by the paper discharge roller 59.

  A scanner unit 45 shown in the figure optically reads a document image to be printed by the print head 53b. As is generally known, the platen 46 on which an original sheet is placed and set, a carriage 47 that scans an original image along the platen 46, and an optical device that photoelectrically converts an optical image from the carriage 47. A reading means (for example, a CCD device) 48 is included. In the illustrated example, a document feeder 49 for automatically feeding a document sheet to the platen 46 is provided on the platen 46.

[Configuration of bookbinding device (sheet handling device)]
Next, the bookbinding apparatus C is connected to the downstream side of the image forming apparatus B described above, and the sheets on which the images have been formed are aligned in a bundle shape, and the sheet bundle aligned in the bundle shape is stapled, adhesive tape, and adhesive. Binding is done with glue, and the bookbinding process is performed. The sheet bundle after the bookbinding process is cut and aligned by the aforementioned sheet bundle cutting apparatus A and stored in the paper discharge stacker. The bookbinding apparatus C shown in FIG. 12 staples and binds the center of a bundle of paper sheets arranged in a bundle, and folds the saddle-stitched paper bundle into a booklet, and then cuts the folded leading end. The apparatus to align is shown.

  Therefore, a carry-in route 61 that is continuous with the paper discharge port 58 of the image forming apparatus B is provided, and the stacking tray 62 is disposed on the downstream side of the route paper discharge port 61 a of the carry-in route 61. The tray is provided with a switchback roller 62a for transferring the sheet back and forth in the paper discharge direction and a rear end regulating member 62b for regulating the rear end of the sheet. The switchback roller 62a conveys the sheet from the path sheet discharge outlet 61a to the front end side of the tray in the sheet discharge direction, and after the sheet rear end enters the tray, the sheet is transferred in the direction opposite to the sheet discharge direction. Abutting the end regulating member 62b for positioning. The rear end regulating member 62b is swingable between a position protruding from the tray and a position retracted from the tray, and is connected to a shift means (not shown) such as an electromagnetic solenoid. The accumulation tray 62 is provided with a rear end pushing member 63 for carrying the accumulated sheet bundle to the downstream side. A side alignment member (not shown) is arranged on the stacking tray 62 so as to position and align the conveyance orthogonal direction of the sheet entering from the path discharge port 61a. Accordingly, the sheets from the path discharge port 61a are carried onto the tray, and are stacked in a bundle shape with the trailing end of the sheet being regulated by the trailing end regulating member 62b. Thereafter, the sheet bundle is carried out downstream by the rear end pushing member 63 in a state where the rear end regulating member 62b is retracted from the stacking tray 62.

  A bookbinding path 64 is provided downstream from the stacking tray 62, and a saddle stitch stapler 65 is disposed in the bookbinding path 64. The structure of the saddle stitching stapler 65 is not described in detail, but is composed of a unit that inserts staples into a sheet bundle and bends the leading end, and an upper unit that inserts staples and a lower unit that bends the leading end transfer the sheet bundle. The bookbinding path 64 is arranged vertically. The bookbinding path 64 is provided with a first stopper 64a and a second stopper 64b for locking the leading end of the sheet bundle. The first stopper 64a is configured by a movable member that can freely move in and out of the bookbinding path 64, and is arranged so that the saddle stitching stapler 65 is positioned at the center of the sheet bundle in a state where the leading end of the sheet bundle is locked. Accordingly, the sheet bundle accumulated on the accumulation tray 62 is transferred to the bookbinding path 64 by the rear end pushing member 63, and is bound by the saddle stitching stapler 65 with the front end locked by the first stopper 64a.

  After the first stopper 64a is retracted from the bookbinding path 64, the sheet bundle that has been saddle stitched and bound as described above is engaged with the second stopper 64b on the downstream side. In this state, a folding roll 66a and a middle folding knife 66b are arranged to bend the center (staple binding position) of the sheet bundle. The middle folding knife 66b is composed of a blade that can move up and down in the direction of the arrow, and guides the sheet bundle in the bookbinding path to the folding roll 66a. The folding roll 66a is composed of a pair of rolls, and is bent at the center of the sheet bundle and transported to the paper discharge path 67 on the downstream side.

  A paper discharge path 67 disposed on the downstream side of the folding roll 66 a is configured as a switchback path, and guides the sheet to the cutting path 68. In the figure, 67a is a switchback roller, and 67b is an intermediate tray. The cutting device A is arranged in the cutting path 68 configured as described above. The cutting apparatus A is the apparatus described with reference to FIG. 1, and the operation thereof will be described later. The cutting path 68 is provided with a belt conveying means 69 for transferring the sheet bundle and a grip rotating means 70.

  In the above configuration, the sheets on which the image is formed by the image forming apparatus B are stacked and aligned on the stacking tray 62 in a bundle. Therefore, when a control CPU (not shown) provided in the bookbinding apparatus C receives a job end signal from the image forming apparatus B, the trailing edge regulating member 62b is retracted out of the tray, and the trailing edge pushing member 63 moves the sheet bundle downstream. To the bookbinding path 64. Then, the leading end of the sheet bundle is brought into contact with the first stopper 64a in the bookbinding path and stopped. In this state, the saddle stitching stapler 65 is operated to staple the center (center folding position) of the sheet bundle. Next, the control CPU retracts the first stopper 64a out of the path and stops the sheet bundle by abutting against the second stopper 64b further downstream. Then, the center (staple binding position) of the sheet bundle faces the folding roll 66a, and the middle folding knife 66b is moved in the direction of the arrow in this state. Then, the sheet bundle is guided to the folding roll 66a while being bent at the center. Therefore, when the folding roll 66a is rotationally driven, the sheet bundle is bent at the center and transferred to the paper discharge path 67 on the downstream side.

  In this way, the sheet bundle guided to the paper discharge path 67 is sent to the cutting path 68 with the conveying direction reversed. In the cutting path 68, the sheet bundle is switched back by the belt conveying means 69 to position the leading end. In this leading edge positioning, the sheet bundle is conveyed to the right side in FIG. 8 with the movable cutting blade 25 retracted to the standby position, and the entire sheet bundle enters the cutting path 68. Accordingly, the sheet bundle is returned to the left side of the figure by the belt conveying means 69 and the sheet bundle is positioned so that the predetermined cutting line CL coincides with the position of the cutting blade. Next, the control CPU nips the sheet bundle by the grip rotating means 70 and then presses and holds the sheet bundle by the pressing means 20. Therefore, the movable cutting blade 25 is moved in a predetermined direction. In this cutting state, the edge of the sheet bundle is cut by the procedure described above with reference to FIGS.

  Next, after cutting the small edge portion of the sheet bundle, the control CPU releases the pressing means 20 and operates the grip rotating means 70 to rotate the sheet bundle, for example, 90 degrees so that the top portion faces the cutting position. After the sheet bundle is rotated, the sheet bundle is fed to the cutting line CL by a predetermined amount. The sheet bundle is transferred by moving the grip rotating means 70 to the right side in the drawing or by the belt conveying means 69. Thereafter, the top of the sheet bundle is cut, and the fore edge is cut similarly. When the cutting of the sheet bundle in the three directions is completed, the control CPU carries out the sheet bundle to the sheet discharge stacker 71 by the belt conveying means 69.

  The illustrated bookbinding apparatus C shows a case where booklet binding is performed by the saddle stitch stapler 65. However, in this case, an adhesive is applied to the end surface of the bundle of sheets stacked in a bundle, and the case binding is performed with a cover sheet (case binding). Of course, it is also possible to bind the top paste without covering with a cover sheet.

The perspective view which shows the whole structure of the paper sheet bundle cutting device concerning this invention. Explanatory drawing which shows the front structure of the apparatus of FIG. Explanatory drawing which shows the back surface structure of the apparatus of FIG. Explanatory drawing which shows the structure of the cutting edge press means in the apparatus of FIG. 2A and 2B are explanatory diagrams of a cutting state of a sheet bundle in the apparatus of FIG. 1, in which FIG. 1A shows a state where the cutting blade is in a standby position (top dead center), and FIG. FIG. It is explanatory drawing of the cutting state of the paper sheet bundle in the apparatus of FIG. 1, (c) shows the state in the middle of cutting a paper sheet with a cutting blade, (d) is the state which complete | finished cutting of the paper sheet with the cutting blade Respectively. Explanatory drawing of the longitudinal cross-section in the apparatus of FIG. FIG. 2 is an exploded assembly explanatory view showing a positioning structure of a fixed cutting blade and a movable cutting blade in the apparatus of FIG. 1. FIGS. 9A and 9B are explanatory views of a positioning state of the fixed cutting blade and the movable cutting blade in the configuration of FIG. 8, where FIG. The state which pressed is shown. Structure explanatory drawing of the cutting edge press means in the apparatus of FIG. Explanatory drawing which shows the structure of the cutting apparatus different from the apparatus of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory diagram of a finisher device incorporating a paper sheet cutting device according to the present invention. Explanatory drawing of the paper sheet cutting state in the conventional cutting apparatus.

Explanation of symbols

A Paper sheet bundle cutting device (trimmer unit)
B Image forming apparatus C Bookbinding apparatus M Drive motor CL Cutting line 10 Apparatus frame (base plate)
10r bent piece 11 long hole 12 cutting opening 13d drive rotation member (drive side)
13f Drive rotating member (driven side)
13p Transmission pin 13s Bearing sleeve 13x Rotating shaft (drive side)
13y Rotating shaft (driven side)
15 Paper platform (paper platform assembly)
15w Step 16 Energizing means 17R Guide member 17L Guide member 17g Guide groove 18 Pressing spring 19 Pressing member 20 Pressing means 21 Pressing plate 21k Engagement piece 21p Lower end surface 25 Movable cutting blade 25c Cutting edge member 25f Upper end flange portion 25h Blade Receiving holder 25w Concave groove 25x Upper edge 28 Fixed cutting blade 29 Transmission chain 30 Sprocket (30a, 30b)
45 Scanner unit 49 Document feeder 62 Stack tray 71 Paper stacker

Claims (5)

An apparatus for cutting paper sheets along a predetermined cutting line,
A paper platform for supporting the sheet;
Pressing means for pressing and holding the sheet on the paper table;
A movable cutting blade capable of moving in a vertical cutting direction with respect to the sheet on the paper table;
A fixed cutting blade disposed on the paper platform side and in sliding contact with the movable cutting blade;
A drive motor for moving the movable cutting blade in the vertical cutting direction;
With
The fixed cutting blade is configured to be movable in a direction substantially perpendicular to the cutting direction so as to be slidable to the movable cutting blade,
The fixed cutting blade is provided with an urging spring that urges and urges the movable cutting blade.
The paper sheet cutting apparatus, wherein the fixed cutting blade is configured such that a position in the cutting orthogonal direction is regulated by a pressing force pressing the sheet onto the paper table by the pressing means. The fixed cutting blade is fixed to the paper table or integrally fixed to a part of the paper table,
2. The paper sheet cutting apparatus according to claim 1, wherein the pressing means includes a pressing member that presses the sheet on a paper table integrated with the fixed cutting blade. The pressing means includes
A pressure member for pressing a sheet on the paper table;
A pressure spring for biasing the pressure member;
A pressure release means for retracting the pressure member above the paper table;
Consists of
The fixed cutting blade is
The pressurizing member is positioned by being pressed against the movable cutting blade by the biasing force of the biasing spring when releasing the pressure,
The position is held by the urging force of the pressure spring when the pressure member is pressurized,
A sheet cutting apparatus characterized by that. The cutting blade is connected and supported by a pair of drive rotation members arranged at a distance in the cutting line direction of the sheet,
This drive rotating member is connected to the drive motor and configured to move the cutting blade in the up and down cutting direction,
The pressure releasing means is configured to retract the pressure member from the fixed cutting blade by rotating the movable cutting blade in the anti-cutting direction with the rotation driving member. The paper sheet cutting apparatus as described. An urging spring that urges the fixed cutting blade in a cutting orthogonal direction, and a pressing spring that presses the pressing member against a sheet on a paper table,
The acting force in the cutting orthogonal direction by the pressure spring is set to be larger than the acting force in the cutting orthogonal direction by the biasing spring with respect to the sheet on the paper table. Paper sheet cutting device.

Images