JP5063144B2 - Paper bundle cutting machine - Google Patents

Description

  The present invention relates to a cutting device that cuts a sheet bundle held on a paper table, for example, aligns sheets formed with an image by an image forming apparatus into a bundle shape, and sets the sheets in a predetermined cutting line. It is related with the improvement of the cutting mechanism which cuts with a.

  In general, this type of cutting apparatus is widely used as an apparatus for setting a bundle of paper sheets stacked in a bundle 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, a cutting apparatus that sets a single sheet on a table and cuts the sheet, and as disclosed in Patent Document 2, for example, A cutting apparatus that sets a large number of sheets in a bundle and cuts them at once is known. And as a cutting method, when cutting with a cutting blade (disk blade) that moves from one end of the sheet to the other end as in Patent Document 1, and a flat plate shape from above the bundle-shaped sheet as in Patent Document 2 What cuts when a cutting blade (guillotine blade) descends is known, respectively.

  In the mechanism for cutting by cutting one sheet blade from one end to the other end of the sheet as in Patent Document 1, if a large number of sheet bundles are cut at once, the shearing force applied to the cutting blade is increased. When the cutting blade runs with a force that exceeds this, it will meander. For this reason, conventionally, such a cutting mechanism is employed when cutting one sheet. Accordingly, it is almost impossible to cut a large number of sheet bundles at once with such an apparatus.

  Further, when a large number of sheet bundles are cut at once with a cutting blade that moves up and down in the thickness direction as in Patent Document 2, it is necessary to increase the shear energy required for cutting. This requires a striking force to the sheet bundle by vigorously lowering the cutting blade at high speed, and the apparatus must be constructed to be robust and large. Therefore, in this publication, the cutting blade is configured in an oblique shape inclined along the cutting line, and when the cutting blade is lowered, the sheet bundle on the paper table is gradually cut from one end to the other end. Has been tried.

  Further, Patent Document 3 proposes an apparatus in which a plate-shaped cutting blade is supported on a pair of left and right swing arms and the cutting blade is moved in an arc from top dead center to bottom dead center. When the cutting blade that moves up and down in this way swings with a pair of arm members and cuts the sheet bundle, the impact on the apparatus can be reduced when the cutting blade reaches the bottom dead center (cutting end posture). . The publication does not disclose any pressing mechanism that presses and holds a sheet bundle (in the case of the publication, one sheet) at the time of cutting.

A cutting edge press mechanism that presses and holds a sheet bundle on a paper table with such an apparatus is disclosed in Patent Document 2, for example. In this publication, a pressurizing member that pressurizes a sheet bundle on a paper mount is configured to be movable up and down, and this pressurizing member is pressed and held by a hydraulic mechanism. Therefore, since the pressure press mechanism includes a hydraulic cylinder and its operating mechanism, the apparatus is large and expensive.
Japanese Patent Laid-Open No. 10-138194 JP 2003-71780 A JP-A 53-1034889

  As described above, when a plurality of sheets are stacked in a bundle and cut, the apparatus for cutting a sheet bundle with a plate-like cutting blade (hereinafter referred to as “guillotine blade”) A cutting edge press means for pressing and holding the sheet bundle along the line is required. Conventionally, this cutting edge press means employs a mechanism for lowering the pressing member by a hydraulic mechanism as disclosed in the above-mentioned Patent Document 2. Also known is a mechanism in which the pressing mechanism is composed of a pressing member that abuts against the sheet bundle and an urging spring that presses the pressing member, and the urging force of the urging spring is released by a drive motor or the like. Yes.

  However, the conventional press mechanism separately prepares a blade drive motor that moves the cutting blade up and down and a press drive motor that moves the press member up and down individually, and first operates the press member with the press drive motor, then the blade drive motor It is comprised so that a cutting blade may be operated. Therefore, since at least two drive motors and a transmission mechanism for transmitting the rotation to the cutting blade and the pressure member are required, the apparatus has a problem that it is large and at the same time expensive.

  For example, the present inventor attempted to reduce the impact at the time of cutting by configuring the guillotine blade to move up and down while drawing a circular arc locus with a pair of left and right arm members as in Patent Document 3 described above. In addition, a press mechanism for pressing and holding the sheet bundle against the paper mount is required, and the above-described apparatus is increased in size and manufacturing costs are increased.

  Therefore, the present inventor has realized the simplification of the above-described mechanism and the downsizing and compactness of the apparatus by configuring the driving mechanism for moving the cutting blade up and down and the pressing mechanism for pressing and holding the sheet bundle with a single driving motor. As a result, it has been found that the manufacturing cost of the apparatus can be reduced.

  The present invention can simplify a press mechanism for pressing and holding a paper sheet bundle on a paper table and a cutting mechanism for cutting the paper sheet bundle, so that the apparatus can be reduced in size and size and manufactured at low cost. The main problem is to provide a sheet bundle cutting device that can handle the above.

In order to achieve the above object, the present invention adopts the following configuration. A paper loading table for supporting the Kamihataba, a cutting blade for cutting a sheet bundle on the sheet loading table along the cutting line, and a press means for pressing and holding the Kamihataba on the paper loading table, said cutting the blade and pressing means, and driving means for driving to move up and down between an operative position for cutting or pressing standby position and Kamihataba spaced from Kamihataba.
Therefore, the cutting blade is supported by a pair of left and right arm members or eccentric cam members spaced apart in the direction of the cutting line, and is configured such that the cutting blade moves up and down by its arc motion. A pressure member that moves up and down in conjunction with the cutting blade and a biasing spring that biases the pressure member so as to repress the sheet bundle on the paper table.

The drive means includes a drive motor and drive transmission means that moves the cutting blade and the pressing means up and down by rotating the arm member or the eccentric cam member by rotation of the driving motor, and the cutting blade and the pressing means. Is set so that the cutting blade cuts the sheet bundle after the pressing member presses the sheet bundle.
The arm member or the eccentric cam member is set in an arc motion in the order of top dead center, cutting start point, and cutting end point, and the standby position is set near the top dead center. At the end point, the cutting blade cuts the paper sheet while moving in the opposite direction along the cutting line.

Each of the pair of left and right arm members or eccentric cam members has a rotation shaft, and the driving means includes transmission means such as a chain and a belt for connecting the left and right rotation shafts to each other .

When the cutting blade moves from the cutting start point to the cutting end point along an arc locus along the cutting line, the cutting blade is pulled in the pushing direction with respect to the sheet bundle on the paper table and is pulled at the end of cutting. The sheet is set to be cut while moving in the direction .

  Tray means for stacking sequentially supplied sheets in a bundle, a bundle binding means for binding the sheet bundle from the tray means, and a sheet bundle cutting device for cutting the sheet bundle bound by the bundle binding means The paper sheet bundle cutting apparatus has the above-described configuration.

  The present invention provides a cutting edge pressing means for pressing and holding a paper sheet bundle on a paper table and a cutting blade for cutting the paper sheet bundle in a single drive motor by a press motion transmission means and a cutting motion transmission means. Since the drive is transmitted so as to cut with a cutting blade after pressing the bundle, the drive mechanism can be simplified compared to the case where the conventional press means and the cutting blade are each driven by separate drive motors. The device can be made compact, lightweight and compact, and at the same time the manufacturing cost can be significantly reduced.

  Furthermore, the transmission mechanism is further simplified and the manufacturing cost is reduced by configuring the cutting edge press means to press and hold the sheet bundle in conjunction with the operation of the cutting blade descending from above the paper table. Is possible.

  In addition, a configuration is adopted in which the cutting blade is moved up and down by a pair of left and right arm members or eccentric cam members, and a cutting edge press from a transmission means such as a chain and belt that rotationally drives the pair of arm members or eccentric cam members synchronously. By constructing the sheet bundle so as to press and support the sheet bundle in conjunction with each other, it is possible to simplify the transmission mechanism and reduce the manufacturing cost as described above.

  The present invention will be described in detail below based on the preferred embodiments shown in the drawings. FIG. 1 is an explanatory diagram showing the overall configuration of a sheet bundle cutting apparatus according to the present invention, in which a cutting blade is in a standby position. FIG. 2 is an explanatory view showing a state where the cutting blade is in a cutting position in the apparatus of FIG. 1. FIG. 3 is a longitudinal sectional view of FIG. 1, and FIG. 4 is an explanatory view showing a configuration of a cutting edge presser for a sheet bundle. 5 and 6 are explanatory views of the cutting state in the apparatus of FIG. 1, FIG. 5 (a) is a state in which the cutting blade is in the standby position, and FIG. 5 (b) is a state in which the cutting blade is cutting the paper sheet. 6A is an explanatory diagram of a state where the cutting blade has finished cutting the sheet bundle, and FIG. 6B is an explanatory diagram of a state where the cutting blade after cutting returns to the standby position. FIG. 7 is an explanatory view showing a different aspect of the blade holding means from FIG.

  A sheet bundle cutting apparatus A shown in FIG. 1 includes an apparatus frame 10, a paper table 15 that holds a bundle of paper sheets (hereinafter referred to as “paper sheet bundle P”) such as paper sheets and plastic films, and the like. A cutting edge press means 20 that presses and holds the sheet bundle P on the paper table 15 and a cutting blade 25 that moves up and down between a standby position Wp set above the sheet bundle P and the cutting position. Is done. The cutting blade 25 and the cutting edge press means 20 move up and down between a standby position Wp set above the paper table 15 and an operation position for cutting or pressing the sheet bundle on the paper table 15. It is configured as follows. Each configuration will be described below.

[Configuration of device frame]
The apparatus frame 10 is composed of an appropriate frame that supports the paper table 15, the cutting blade 25, and the cutting edge press means 20. For example, when the apparatus frame 10 is incorporated in a bookbinding apparatus or the like, the apparatus frame 10 is arranged in a sheet bundle conveying mechanism, and has an appropriate structure according to the apparatus specifications. The apparatus frame 10 shown in FIGS. 1 and 2 includes a lower frame 11a that constitutes the paper mount 15, an upper frame 11b that is substantially parallel to the upper frame 11 with a distance therebetween, and left and right frames that connect the upper and lower frames 11a and 11b. The frame is composed of side frames 11c and 11d and a back plate 11e. The other apparatus frame 10 is formed in a suitable shape according to the apparatus configuration in which the cutting apparatus A such as a finisher apparatus is incorporated.

[Configuration of the paper platform]
The paper table 15 is composed of a table member for placing and supporting a bundle of paper sheets P, and is fixed to the apparatus frame 10. The paper table 15 is arranged so as to support the sheet bundle in a horizontal posture, a vertical posture, or a posture inclined at a predetermined angle according to the apparatus specifications. That is, the paper table 15 is arranged in various postures according to the configuration of a conveyance path (not shown) for conveying paper sheets. For example, in the vertical posture, the paper plate P is pressed against the paper table 15. The sheet bundle P is configured to be held in cooperation with the holding nip means. The illustrated one is arranged in a conveyance path for conveying the sheet bundle P in a horizontal posture. The paper table 15 is provided with a fixed blade, which will be described later, and in the configuration in which the peripheral edge of the sheet bundle bound by the bookbinding apparatus is trimmed and cut, for example, a rotary table is provided on the paper table 15. The top portion, the ground portion, and the fore edge portion are sequentially cut while rotating the sheet bundle.

[Configuration of cutting blade]
The cutting blade 25 is supported by the apparatus frame 10 described above, and has the following configuration for cutting the sheet bundle P pressed and supported on the paper table 15 by a cutting edge press means 20 (described later). The cutting blade 25 is composed of a plate-like blade that is longer than the cutting length of the sheet bundle P. The cutting edge 25a of the plate-shaped cutting blade 25 is inclined at a predetermined angle (α) along the cutting line X, and this inclination causes the sheet bundle P on the paper platform 15 to extend from one end to the other end along the cutting line X. It is configured to cut gradually (see the figure). The illustrated cutting blade 25 includes a blade edge (member) 25a and a blade holding member 25b on which the blade edge member 25a is mounted. Hereinafter, the blade edge member 25a and the blade holding member 25b are referred to as a “cutting blade 25”.

  The above-described cutting blade 25 is supported by a pair of left and right arm members 26R and 26L that are separated by a distance Ln in the cutting line X direction of the sheet bundle P, and is configured to move up and down between a standby position and an operating position. Yes. That is, the back plate 11e of the apparatus frame 10 is provided with the rotation shafts 26x and 26y with a distance Ln, and the base ends of the arm members 26R and 26L are integrally connected to the rotation shafts 26x and 26y. A plate-like cutting blade 25 is pivotally attached to the tip of each arm member 26 so as to be rotatable. Therefore, when the pair of left and right rotating shafts 26x and 26y are rotationally driven, the arm members 26R and 26L attached thereto rotate, and the cutting blade 25 draws an arc locus between the upper standby position Wp and the lower operation position Cp. It will move up and down. 12 a and 12 b shown in the figure are guide members for guiding the vertical movement of the cutting blade 25, and are provided on the side frames 11 c and 11 d of the apparatus frame 10.

  In particular, in the illustrated apparatus, the cutting blade 25 is configured by separating the blade edge member 25a and the blade holding member 25b as described above, and the blade holding member 25b is axially supported by the arm members 26R and 26L (see FIG. 3). . This is to allow only the blade edge member to be replaced with the deterioration of the blade edge. In order to make this blade tip replacement easy and inexpensive, the blade member 25a is mass-produced with a plate-like drawn steel material, and is fixed to the blade holding member 25b incorporated in the apparatus with an adhesive (for example, double-sided tape). Therefore, the blade holding member 25b is formed with a blade mounting recess 25c having a step 25y, and a plate-shaped blade edge member 25a is joined to the blade mounting recess 25c. The blade mounting recess 25c has an inclination (α) in the cutting line X direction. If the flat blade edge member 25a is joined to the blade holding member 25b with an adhesive or a set screw, the inclination α described above can be obtained. The shear force that is formed and simultaneously acts on the blade edge is firmly received by the step 25v of the blade holding member 25b.

[Cutting blade drive mechanism]
As described above, the cutting blade 25 is axially supported by the pair of left and right arm members 26R, 26L, and the cutting blade 25 moves up and down between the standby position Wp and the operating position Cp by rotationally driving the arm member. Therefore, the drive mechanism of the arm member 26 is configured as follows, for example. The pair of left and right arm members 26R and 26L are driven to rotate at the same angular velocity in synchronization with the rotation shafts 26x and 26y, respectively. If this is configured so that one is driven and the other is driven, the drive system is locked due to interference with each other, so that it is necessary to drive both arm members in synchronization.

  Therefore, in the illustrated apparatus, the rotation of the drive motor M (mounted on the above-described back plate 11e) is transmitted to the rotation shaft 26x of the arm member 26L by a gear mechanism. On the other hand, sprockets are integrally attached to the rotary shafts 26x and 26y, and a chain 26c (transmission means) is bridged between the two sprockets. Therefore, when the rotating shaft 26x is rotated in a predetermined direction by the drive motor M, the rotating shaft 26y is also rotated in the same direction by the same amount in synchronism with this.

[Cutting operation of cutting blade]
The sheet bundle cutting operation of the cutting blade 25 configured as described above will be described. As shown in FIG. 5, when the pair of left and right arm members 26 are driven to rotate by the drive motor M, the cutting blade 25 is moved from the standby position Wp to the operating position. In the process of descending to Cp, the sheet bundle P on the paper platform is cut. At this time, since the cutting blade 25 is inclined at a predetermined angle (α), the cutting blade 25 is gradually cut from one end to the other end in the cutting line X direction. And the angle (shear angle) between each paper sheet and the blade edge is cut at the same angle (α) from the uppermost paper shown in FIG. 5A to the lowermost paper shown in FIG. Therefore, by setting this angle α to an optimum angle for cutting the paper sheet (from 3 degrees to 10 degrees), the sheet bundle P can be gradually cut from one end to the other end under uniform cutting conditions. Become.

  In the cutting operation described above, the cutting blade 25 moves up and down while moving left and right in the direction of the cutting line X along an arc locus following the locus drawn by the pair of left and right arm members 26R and 26L. Therefore, as shown in FIG. 5, a cutting blade 25 that pivots about a pair of left and right rotating shafts 26x and 26y is moved between the top dead center P1, the inflection point P2, and the bottom dead center P3 of the arc locus. Set to disconnect. That is, the standby position Wp is set in the vicinity of the top dead center P1 (not necessarily the top dead center). Then, the cutting start point PS and the cutting end Pe are set as follows when the maximum allowable sheet bundle is cut. The cutting start point PS is set between the top dead center P1 and the inflection point P2, and the cutting end point Pe is set near the inflection point P2 and the bottom dead center P3 (not necessarily the bottom dead center). To do.

  A cutting start point is set on the upstream side and a cutting end point is set on the downstream side of the inflection point P2 with respect to the cutting blade 25 that swings and moves along the circular arc locus. Then, in the illustrated embodiment, when the cutting blade 25 descends from the standby position Wp to the cutting position Cp, it first moves to the left in the cutting line direction, and then moves to the right (after exceeding the inflection point P2). . As a result, the cutting edge of the cutting blade 25 is lowered while moving the sheet bundle on the paper table to the left at the start of cutting, and is lowered while moving to the right at the end of cutting to cut the sheet bundle.

  In this way, the sheet bundle is displaced in a load-displacement manner during the cutting process by reversing the moving direction of the cutting blade that moves downward while moving left and right in the cutting line X direction at the start and end of cutting. There is no. As described above, the present invention lowers the cutting blade in the cutting line direction when moving the cutting blade in the cutting line direction when cutting the sheet bundle by lowering the cutting blade from above to cut the sheet bundle. And at the end of cutting (the illustrated one moves to the left and then to the right).

  Further, the movement of the cutting blade in the cutting line direction is set in the pushing direction at the start of cutting and in the pulling direction at the end of cutting. That is, as shown in FIG. 6A, when the cutting is started, the illustrated point (arbitrary portion of the cutting edge) Po of the blade edge gradually moves to the left in the order of Po1, Po2, Po3, Po4, and at the end of cutting, Po5, Po6, Po7, Gradually move to the right in the order of Po8. In general, when a soft block material is cut with a knife-like blade edge, cutting is performed while pushing the knife at the beginning of cutting, and cutting is performed while pulling the knife at the end of cutting. Accordingly, the cutting blade 25 moves down in the cutting direction at the start of cutting with respect to the sheet bundle P and descends while moving toward the cutting escape side at the end of cutting, and the cutting end surface of the sheet bundle is sharp and uneven. There are few cut surfaces. In particular, there is no broken surface where the edge of the paper is torn off at the end of cutting.

[Configuration of cutting edge press means]
Next, the configuration of the cutting edge press means 20 that presses and holds the sheet bundle P on the paper table 15 will be described. The cutting edge press means 20 is arranged to be movable up and down between a standby position Wp above the paper table 15 and an operation position Cp for pressing and holding the sheet bundle P on the paper table 15, and driving means ( It is configured to move up and down by a drive motor or the like.

  Therefore, the present invention is configured such that the cutting edge press means 20 is integrally formed with the above-described vertical movement mechanism of the cutting blade 25, and at the same time, the cutting edge press means 20 is moved up and down by the drive motor M that moves the cutting blade 25 up and down. It is characterized by. This simplifies the device, reduces the size, and reduces manufacturing costs. For this reason, the cutting edge press means 20 is comprised from the pressurizing member 21 and the urging | biasing spring 22 which provides a pressing force to this pressurizing member 21 as follows.

  The pressure member 21 that presses and holds the paper sheet bundle P on the paper table 15 is configured by a plate member (flat plate member) that presses the paper sheet bundle P along the cutting line X. The pressure member 21 is superposed on the above-described cutting blade 25 and both are integrally supported by the vertical movement guide mechanism (the above-described arm member and guide member), and the vertical driving mechanism (the above-described drive motor M) of the cutting blade 25 is supported. And arm members). For this reason, the pressing member 21 is provided with long grooves (lateral grooves) 21a and 21b in the cutting line X direction, and the cutting blade 25 is provided with slit grooves (vertical grooves) 40a and 40b in the vertical direction. The pressurizing member 21 is integrally supported by the cutting blade 25 by a guide pin 41 inserted through the long groove 21 and the slit groove 40. The pressure member 21 and the cutting blade 25 are fitted to the above-described guide member 12 in a state where they are overlapped with each other.

  Therefore, the cutting blade 25 moves up and down independently of the pressure member 21 along the slit groove 40, and moves left and right independently of the cutting line direction along the long groove 21. On the other hand, the pressure member 21 moves upward following the movement of the cutting blade 25 ascending (moving from the operating position Cp to the standby position Wp) by the groove lower edges 40c and 40d of the slit grooves 40a and 40b. ing. Although the slit groove 40 and the long groove 21 shown in the drawing are arranged at two places on the left and right sides of the cutting blade 25, this may be one place or two places or more.

  The pressing member 21 is provided with urging springs 22a, 22b, and 22c, and an elastic force is always applied in the direction of pressing and holding the sheet bundle P on the paper table 15. The illustrated urging spring 22 is fitted and supported between a spring mounting pin 23 a planted on the upper frame 11 b of the apparatus frame 10 and a spring mounting pin 23 b planted on the pressure member 21. The slit groove 40 is formed in a groove shape such that the lower edge 40c, 40d of the groove rises against the biasing spring 22 and raises the pressure member 21 to the standby position Wp with the cutting blade 25 shown in the drawing in the standby position. Has been.

  Therefore, in the process in which the cutting blade 25 performs the above-described cutting operation by the drive motor M, the pressure member 21 is lowered from the standby position Wp as the cutting blade 25 is lowered, and the elastic force of the urging spring 22 causes the pressure member 21 to move on the paper table. When the sheet bundle is pressed and the cutting blade 25 moves from the operating position Cp (cutting position) to the upper standby position, the pressure member 21 is separated upward from the paper mount 15 by the groove lower edge 40c, 40d of the slit groove 40. It will return to the standby position. In this process, the long groove (lateral groove) 21 becomes a relief groove when the cutting blade 25 moves left and right in the cutting line X direction.

[Different forms of cutting edge press means]
The cutting edge press means 20 can adopt the structure shown in FIG. Unlike the foregoing, the pressure member 45 is formed of an elastic member that presses the sheet bundle P onto the paper platform 15. The pressure member is formed in a shape that presses and holds the vicinity of the cutting line of the sheet bundle with a porous member 45a such as a sponge and a backup member 45b. Then, a pair of pressure levers 46a and 46b having shafts 46x and 46y supported on the apparatus frame 10 are arranged on the left and right in the cutting line direction, for example. The front ends of the left and right pressure levers 46 are brought into the traveling locus of the chain 26c. Therefore, the backup member 45 b is attached to the pair of left and right pressure levers 46. 45p in the drawing is a connecting pin that connects the pack-up member 45b and the pressure lever 46, and 47 is a tension spring that constantly urges the backup member 45b toward the standby position.

  Cam members (e.g., eccentric cams) 48a and 48b are disposed at the distal ends of the left and right pressure levers 46a and 46b. The cam member 48 includes a rotating shaft 48x, a sprocket 48S, and a cam surface 48c that are pivotally attached to the back plate 11e of the apparatus frame 10, and rotate integrally with each other. Therefore, the sprocket 48S is engaged with the chain 26c (transmission member) described above. The chain 26c is connected to the drive motor M described above, and the pair of left and right arm members 26R and 26L are rotated in synchronization to move the cutting blade 25 up and down. The rotary shaft 48x is rotated by the sprocket 48S meshed with the chain 26c, and the pressure levers 46a, 46b are shifted downward in FIG. 9 by the cam surface 48c attached to the rotary shaft. Therefore, the cam surface 48c is set so that the cutting blade 25 cuts the sheet bundle P after the pressing member 45 presses and supports the sheet bundle P on the paper platform 15 by the rotation of the drive motor M. .

  The operation relationship between the cam surface 48c and the cutting blade 25 will be described with reference to the drawings. The arm members 26R and 26L rotate around the rotation shafts 26x and 26y, and the top dead center P1 and the inflection point P2 A cutting start point PS is set between them. Therefore, the standby position Wp of the cutting blade 25 and the pressure member 45 is set between the top dead center P1 or the top dead center P1 and the cutting start point PS. Then, the pressing start point Pp of the pressing member 45 is set between the standby position Wp and the cutting start point PS. Then, the cutting blade 25 moves (lowers) from the standby position Wp to the cutting start position PS in synchronization with the arm member 26 rotating from the upper start point P1 to the bottom dead center P3. Prior to this, the cam surface 48c rotates from the standby position Wp to the pressure start point Pp, and the pressure lever 46 presses and holds the sheet bundle P on the paper table by the pressure member 45. In this case, the thickness variation of the paper sheet bundle (difference between when the paper sheet bundle is several sheets and several tens of sheets) is absorbed by the porous member 45a.

[Configuration of Image Forming Apparatus]
First, the image forming apparatus A can employ various structures such as a copying machine, a printer, and a printing machine, but an electrostatic printing apparatus is illustrated. In the image forming apparatus A, 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 54a and carried out to the paper discharge path 54b. In the paper discharge portion 54, a paper discharge port 54c and a paper discharge roller 54d formed in the casing 51 are disposed. The print sheet on which the image is formed in this manner is carried out from the paper discharge port 54c by the paper discharge roller 54d.

  Note that reference numeral 55 denotes a scanner unit, which optically reads a document image to be printed by the print head 53b. As is generally known, the platen 55p for placing and setting a document sheet, a carriage 55c for scanning a document image along the platen 55p, and an optical device for photoelectrically converting an optical image from the carriage 55c. It comprises reading means (for example, a CCD device) 55r. In the illustrated example, a document feeder 56 for automatically feeding a document sheet to the platen is provided on the platen 55p.

[Configuration of bookbinding device (sheet handling device)]
Next, a bookbinding apparatus is connected to the downstream side of the image forming apparatus described above, and the sheets on which the images are formed are aligned in a bundle, and the sheet bundle aligned in the bundle is stapled, adhesive tape, adhesive glue, etc. Bind them together for bookbinding. The sheet bundle after the bookbinding process is cut and aligned by the above-described cutting apparatus and stored in the paper discharge stacker. The bookbinding apparatus is a device that staples and binds the center of a bundle of paper sheets aligned in a bundle, folds the saddle-stitched paper bundle, binds it into a booklet, and then cuts and aligns the folded leading ends. .

  Therefore, a carry-in path 61 that is continuous with the paper discharge port 54c of the image forming apparatus is provided, and the stacking tray 62 is disposed on the downstream side of the path paper discharge port 61a of the carry-in path. 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 sheet discharge outlet toward the front end of the tray in the sheet discharge direction. After the sheet rear end enters the tray, the switchback roller 62a moves the sheet in the direction opposite to the sheet discharge direction to move the rear end. The positioning is made against the regulating member 62b. The rear end regulating member 62b is swingable between a position protruding on the tray and a position retracted from the tray, and is connected to a shift means (not shown) such as an electromagnetic solenoid. The tray 62 is provided with a rear end pushing member 63 for carrying the accumulated sheet bundle downstream. A side alignment member (not shown) is arranged on the tray 62 so as to align and align the conveyance orthogonal direction of the sheet entering from the sheet discharge port. Accordingly, the sheets from the sheet discharge outlet 61a are carried onto the tray, and are stacked in a bundle shape with the rear end thereof being regulated by the 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 tray.

  A bookbinding path 64 is provided downstream from the stacking tray 62, and a saddle stitch stapler 65 is disposed in this path. Although the structure of the stapler 65 is not described in detail, the stapler 65 is composed of a unit that inserts a staple into the sheet bundle and bends the leading end, and an upper unit that inserts the staple and a lower unit that folds the leading end transfer the sheet bundle It is arranged up and down across the route. 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 path, and is arranged so that the 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 stapler 65 with the front end locked by the first stopper.

  The sheet bundle that has been saddle-stitched as described above is locked to the second stopper 64b on the downstream side after the first stopper 64a is retracted from the path. In this state, a folding roll 66a and a middle folding knife 66b are arranged so as to bend the center (staple binding position) of the sheet bundle. The center 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 64 to the folding roll 66a. The folding roll 66a is composed of a pair of rolls, and bends the center of the sheet bundle and transports it to the downstream paper discharge path 67.

  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. A cutting device 69 is arranged in the cutting path 68 configured as described above. The cutting device 69 is the device described with reference to FIG. 1, and its operation will be described later. In the cutting path 68, a belt conveying means 69 for transferring the sheet bundle and a grip rotating means 70 are arranged.

  In the above configuration, the sheets formed with the image by the image forming apparatus are stacked on the stacking tray 62 and aligned. Therefore, when a control CPU (not shown) provided in the bookbinding apparatus receives a job end signal from the image forming apparatus, the trailing edge regulating member 62b is retracted out of the tray, and the sheet bundle is bound downstream by the trailing edge pushing member 63. Transfer to path 64. Then, the leading end of the sheet bundle is abutted against the first stopper 64a in the path and stopped. In this state, the 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 folding knife 66b is moved in the direction of the arrow in the state of B. Then, the sheet bundle is guided to the folding roll 66a while being bent at the center. Therefore, when the folding roll 66a is driven to rotate, the sheet bundle is bent at the center and transferred to the downstream paper discharge path 67.

  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 68 to position the leading edge. In this leading edge positioning, the sheet bundle is conveyed to the right side in the state where the cutting blade 25 is retracted to the standby position, and the entire sheet bundle enters the cutting path 68. Accordingly, the sheet bundle is moved back by the belt conveying means 68 and the sheet bundle is positioned so that the predetermined cutting line X coincides with the position of the cutting blade. Next, the control CPU nips the sheet bundle with the grip rotating means 70, and then presses and holds the sheet bundle with the press member 22. Therefore, the blade holding means 26 that holds the 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 FIG.

  Next, after cutting the edge portion of the sheet bundle, the control CPU releases the pressing member 22 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 rotation of the sheet bundle, the sheet bundle is fed to the cutting line X by a predetermined amount. The sheet bundle is transferred by moving the grip rotating means 70 to the right in the figure or by the belt conveying means 68. 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 68.

  The illustrated bookbinding apparatus shows a case where bookbinding is bound by the stapler 65. However, in this case, an adhesive is applied to the end face of the sheet bundle that is accumulated in a bundle shape, and the case binding (case binding) is performed with a cover sheet. Of course, it is also possible to bind the top glue without covering it with a sheet.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the whole structure of the paper sheet bundle cutting device concerning this invention. Explanatory drawing which shows the state of a cutting position with a cutting blade with the apparatus of FIG. FIG. 2 is an explanatory diagram of a longitudinal configuration of FIG. 1 in the apparatus of FIG. 1. Explanatory drawing 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 in which the cutting blade is in a standby position, and FIG. FIGS. 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 has finished cutting the sheet bundle, and FIG. 2B shows a state where the cutting blade after cutting returns to the standby position. Respectively. It is explanatory drawing of the aspect different from the blade holding means in the apparatus of FIG. FIG. 2 is an explanatory diagram illustrating a system of a bookbinding apparatus and an image forming apparatus in which the paper sheet bundle cutting apparatus of FIG. 1 is incorporated. The modification of the cutting edge press means different from the apparatus of FIG.

Explanation of symbols

11 apparatus frame 11 fixed frame 11a lower frame 11b upper frame 11c side frame 11d side frame 11e guide groove 12 movable frame 13 rotating shaft 13a timing belt 14 eccentric cam 15 paper mount 16 bracket 20 press means 21a support stem 21b support stem 22 press Member 25 Cutting blade 26x Blade holding means (chain)
26y blade holding means (sliding member)
26p connecting pin 26c roller shaft 27 rotating wheel 28 tension lever 35 guide means (guide member)
35a Guide groove 35b Chain sliding contact surface A Paper sheet bundle cutting device ML Drive motor (blade traveling drive means)
MP Press motor P Paper bundle X Cutting line

Claims (2)

A paper platform for supporting a bundle of paper,
A cutting blade for cutting the sheet bundle on the paper table along a cutting line;
Press means for pressing and holding a bundle of paper sheets on the paper table;
Driving means for driving the cutting blade and the press means so as to move up and down between a standby position spaced from the sheet bundle and an operation position for cutting or pressing the sheet bundle;
With
The cutting blade has a cutting edge inclined at a predetermined angle with respect to the cutting line of the paper sheet so as to gradually cut from one end to the other end at the same angle from the uppermost paper to the lowermost paper of the paper sheet bundle,
It is supported by a pair of left and right arm members or eccentric cam members arranged at a distance in the cutting line direction, and is configured such that the cutting blade swings in an arc locus from the cutting start point to the cutting end point by the arc motion ,
The pressing means includes a pressing member that moves up and down in conjunction with the cutting blade, and a biasing spring that biases the pressing member to repress the sheet bundle on the paper table,
Consists of
The drive means includes a drive motor and drive transmission means for rotating the arm member or the eccentric cam member by rotating the drive motor to move the cutting blade and the press means up and down.
Consists of
The interlock between the cutting blade and the press means is set so that the cutting blade cuts the paper sheet bundle after the pressing member presses the paper sheet bundle,
The arm member or the eccentric cam member is circularly set in the order of top dead center, cutting start point, cutting end point in an arc motion,
When the cutting blade moves from the cutting start point to the cutting end point along an arc locus along the cutting line, the cutting edge moves in a pushing direction at the start of cutting with respect to the sheet bundle, and pulls in at a cutting end. A paper sheet bundle cutting apparatus, wherein the paper sheet is cut in a bundle thickness direction while moving and cuts a paper sheet from one end to the other end . Each of the pair of left and right arm members or eccentric cam members has a rotation shaft,
2. The paper sheet bundle cutting device according to claim 1, wherein the driving means is provided with transmission means such as a chain and a belt for connecting the left and right rotating shafts to each other.

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