JP2005271112A - Sheet cutter and image forming apparatus having the cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely cut a sheaf of sheets by improving the cutting detection accuracy at the end of cutting the sheaf of sheets. <P>SOLUTION: This sheet cutter H includes: a cutting blade 80 for cutting a sheaf of bookbinding sheets P3; a mat 94 for receiving the sheaf of bookbinding sheets cut by the cutting blade; a cutting motor 83 for operating the cutting blade to cut the sheets; a current detecting sensor 98 for detecting the cutting load of the cutting motor 83; an ROM storing the load current value when the cutting blade cuts the sheets to be cut and reaches the mat as a cutting completion current value; and a CPU 200 for stopping the cutting operation of the cutting motor when the present load current value reaches the cutting completion current value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sheet cutting apparatus that cuts a sheet to be cut such as a sheet or a sheet bundle by a cutting blade, and in particular, a sheet cutting apparatus that improves cutting detection accuracy and accurately sets a cutting stop position of the cutting blade; The present invention relates to an image forming apparatus provided with the sheet cutting apparatus.

  Conventionally, this type of sheet cutting apparatus cuts a sheet to be cut by, for example, lowering a plate-shaped cutting blade. In this case, the sheet to be cut is supported by the receiving means and cut. The lowering stop of the cutting blade that cuts the sheet to be cut is performed by providing a detection mechanism for detecting the blade edge position, setting the distance from the detection mechanism to the receiving means in advance, and controlling the blade edge and the receiving means position. (For example, refer to Patent Document 1).

  By the way, when the sheet cutting device stops the lowering of the cutting blade by controlling the distance, it is necessary to set the distance in advance so that the sheet bundle can be reliably cut. At this time, if the set distance is too long, the biting distance between the cutting blade and the receiving means becomes long, and the cutting blade is applied with a force more than necessary for cutting, and the cutting edge of the cutting blade is chipped or bent. There was a fear. For this reason, the biting distance between the cutting blade and the receiving means may not be increased.

  Further, when the cutting blade bites into the receiving means, the sheet to be cut also bites into the receiving means, and the uncut portion of the cut sheet remains in the receiving means, and the uncut portion may interfere with subsequent cutting. Further, when the cut sheet is bitten into the receiving means, fluffing occurs on the cut surface of the cut sheet, and the quality of the cut surface may be lowered.

  Therefore, it is conceivable to shorten the biting distance. However, in this case, another problem may occur that the sheet to be cut cannot be cut reliably.

JP 2001-88091 A

  Since the sheet cutting device provided with the detection means for detecting the position of the blade edge has variations in the position where the detection means is provided, it is necessary to provide an adjustment mechanism for adjusting the attachment position of the detection means, and the number of parts increases. However, there is a problem that the cost becomes high.

  In the above sheet cutting apparatus, the cutting blade is plate-shaped, and the sheet to be cut is cut by this plate-shaped cutting blade, but the blade is formed at the cylindrical tip. The same problem occurs when a hole is made in the cut sheet with a cutting blade.

  An object of the present invention is to provide a sheet cutting apparatus that improves the cutting detection accuracy and makes the cutting stop position of the cutting blade accurate.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus in which the sheet cutting apparatus is provided in an apparatus main body and image forming efficiency is improved.

  In order to achieve the above object, the sheet cutting apparatus of the present invention comprises a cutting blade for cutting a sheet to be cut such as a sheet or a sheet bundle, a receiving means for receiving the cut sheet cut by the cutting blade, and the cutting blade A driving means for cutting the sheet, a load detecting means for detecting a cutting load of the driving means, and a value of the cutting load when the cutting blade cuts the cut sheet and reaches the receiving means. Storage means stored as a completed load value, and control means for stopping the cutting operation of the drive means when the current cutting load value reaches the cutting completion load value.

  The sheet cutting apparatus of the present invention includes a counting unit that counts the number of sheets cut by the cutting blade, the storage unit stores a cutting completion load value corresponding to the count number, and the control unit When the cutting load value reaches the cutting completion load value corresponding to the count number, the cutting operation of the driving unit is stopped.

  The sheet cutting apparatus of the present invention includes a counting unit that counts the number of times the cutting blade cuts the sheet to be cut, the storage unit stores a cutting completion load value corresponding to the count number, and the control unit When the cutting load value reaches the cutting completion load value corresponding to the count number, the cutting operation of the driving unit is stopped.

  In the sheet cutting apparatus of the present invention, the drive means has a drive motor, and the load detection means has a current measuring device for measuring the load current of the drive motor.

  In order to achieve the above object, an image forming apparatus according to the present invention includes an image forming unit that forms an image on a sheet, and a sheet that cuts a sheet to be cut such as a sheet on which an image is formed by the image forming unit or a sheet bundle. A sheet cutting device, wherein the sheet cutting device is any one of the sheet cutting devices described above.

  In order to achieve the above object, an image forming apparatus according to the present invention includes an image forming unit that forms an image on a sheet, and a sheet that is formed by the image forming unit and a sheet to be cut such as a sheet bundle. A blade, a receiving means for receiving the sheet to be cut by the cutting blade, a driving means for cutting the cutting blade, a load detecting means for detecting a driving load of the driving means, and the cutting blade being the workpiece to be cut. A storage means for storing the value of the driving load when the cutting sheet is cut and reaches the receiving means as a cutting completion load value, and when the current driving load value becomes the cutting completion load value, the driving Control means for stopping the cutting operation of the means.

  The image forming apparatus of the present invention includes a counting unit that counts the number of sheets to be cut by the cutting blade, the storage unit stores a cutting completion load value corresponding to the count number, and the control unit When the value of the cutting load reaches the cutting completion load value corresponding to the count number, the cutting operation of the driving unit is stopped.

  The image forming apparatus of the present invention includes a counting unit that counts the number of times the cutting blade cuts the cut sheet, the storage unit stores a cutting completion load value corresponding to the count number, and the control unit When the cutting load value reaches the cutting completion load value corresponding to the count number, the cutting operation of the driving unit is stopped.

  In the image forming apparatus of the present invention, the drive unit includes a drive motor, and the load detection unit includes a current measuring device that measures a load current of the drive motor.

  Since the sheet cutting device of the present invention is configured to stop the cutting operation of the driving means when the current cutting load value reaches the cutting completion load value, the cutting of the sheet to be cut by the cutting blade is completed. The cutting blade reliably cuts the cut sheet, and a cut sheet that does not remain on the cut sheet can be created.

  Unlike the conventional method of setting the cutting time of the sheet to be cut and managing the cutting, the contact time between the cutting blade and the receiving means can be shortened, and the life of the cutting blade and the receiving means can be shortened. Can be made significantly longer.

  Further, unlike the conventional detection means for detecting the position of the blade edge so that the position can be adjusted by the position adjustment mechanism, the detection means and the attachment position are different from the detection that the cutting blade has finished cutting the cut sheet. There is no need to provide an adjustment mechanism for adjustment, the structure can be simplified, and the cost can be reduced.

  The sheet cutting device of the present invention includes a counting unit that counts the number of times the cutting blade cuts the sheet to be cut, and when the control unit reaches a cutting completion load value corresponding to the count number, Since the cutting operation of the driving means is stopped and the cutting of the cut sheet by the cutting blade is stopped, even if the cutting blade is not sharp, the contact time between the cutting blade and the receiving means is shortened to perform cutting. The life of the blade and the life of the receiving means can be significantly increased.

  The sheet cutting apparatus of the present invention includes a counting unit that counts the number of sheets to be cut by the cutting blade, and when the control unit has reached a cutting completion load value corresponding to the count number, Since the cutting operation of the driving means is stopped and the cutting of the cut sheet by the cutting blade is stopped, even if the cutting blade is not sharp, the contact time between the cutting blade and the receiving means is shortened to perform cutting. The life of the blade and the life of the receiving means can be significantly increased.

  Since the image forming apparatus of the present invention includes a sheet cutting device that can significantly increase the life of the cutting blade and the life of the receiving means, the defective rate due to sheet cutting is reduced, and the image-formed sheet is wasted. And the image forming efficiency can be improved.

  An example of a sheet cutting apparatus according to an embodiment of the present invention, a sheet post-processing apparatus equipped with the sheet cutting apparatus, and an image forming apparatus provided with the sheet post-processing apparatus as one of the components in the apparatus main body of the image forming apparatus. The copying machine will be described with reference to the drawings.

  Examples of the image forming apparatus include a copying machine, a printer, a facsimile machine, and a multifunction machine of these, and the image forming apparatus is not limited to the copying machine. Further, the sheet post-processing apparatus is not provided only in the apparatus main body of the copying machine. You may provide in apparatus main bodies, such as a printer, a facsimile, and a multifunctional machine.

  As shown in FIG. 1, the copying machine G of the present embodiment includes an apparatus main body A and a sheet post-processing apparatus B having a trimmer unit D. The apparatus main body A and the sheet post-processing apparatus B are , Each can be used alone.

  In FIG. 1, the sheet post-processing apparatus B is provided as one of the components of the copier G on the side of the apparatus main body A of the copier G, but may be incorporated in the apparatus main body A. .

  Further, the apparatus main body A of the copying machine is provided with a control unit 9 for controlling the apparatus main body A, and the sheet post-processing apparatus transmits and receives data, control signals and the like with the control unit 9 of the apparatus main body A. A central processing unit (hereinafter referred to as “CPU”) 200 for controlling the sheet post-processing apparatus is provided. However, the control unit 9 and the CPU 200 are integrated, and the integrated control unit is connected to the apparatus main body A and the sheet post-sheet. The apparatus main body A and the sheet post-processing apparatus may be controlled by being provided in any one of the processing apparatuses.

  In the sheet post-processing apparatus of the present embodiment, the sheets are bundled and glued to bind the sheet bundle. However, the sheets may be bundled and then saddle stitched and folded. Further, staple binding may be performed by providing a stapler.

  The sheet cutting apparatus according to the present embodiment includes, for example, a rotary stage 60 and a trimmer unit D shown in FIGS. 1, 2, and 8 to 11, and a sheet bundle glued and bound by the conveyance alignment unit C. Although the sheet is cut, a sheet bundle that is saddle-stitched and folded or a sheet bundle that is not bound may be cut.

  Furthermore, the sheet cutting apparatus of this embodiment can cut not only a sheet bundle but also a single sheet. That is, the sheet cutting apparatus according to the present embodiment is capable of cutting sheets to be cut such as sheets and sheet bundles. The case of cutting a sheet bundle will be described.

  Further, in the sheet cutting apparatus according to the present embodiment, the cutting blade has a plate shape, and the sheet bundle is cut by the plate cutting blade. However, instead of the plate cutting blade, a cylindrical shape is used. It can also be used as a punching device for forming a hole in the sheet to be cut by providing a cutting blade having a blade formed at the tip of the shaft and causing the cutting sheet to bite into the sheet to be cut while rotating. For this reason, the cutting blade in this invention contains not only a plate-shaped cutting blade but the cutting blade for drilling which has formed the blade at the front-end | tip of a cylindrical shaft.

  In addition, the numerical value taken up by this embodiment is a reference numerical value, Comprising: This invention is not limited.

[Overall configuration of copier]
FIG. 1 is a schematic front cross-sectional view of a copying machine which is an example of an image forming apparatus provided with a sheet post-processing apparatus having a sheet cutting apparatus according to an embodiment of the present invention. The apparatus main body A of the copying machine G optically reads a document automatically fed from a document feeding apparatus 1 mounted on the upper portion of the apparatus by a scanner unit 2 and uses the information as a digital signal as an image forming unit, for example, an image It is transmitted to the forming unit 3 and recorded on a sheet such as plain paper or an OHP sheet.

  A plurality of sheet cassettes 4 storing sheets of various sizes are provided in the lower part of the apparatus main body A of the copying machine G so that they can be pulled out (only one is shown in the figure, and the others are omitted). The sheet conveyed by the conveyance roller 5 from the sheet cassette 4 is recorded on the image forming unit 3 by an electrophotographic method.

  That is, the apparatus main body A forms a latent image by irradiating the photosensitive drum 3b with a laser beam from the light irradiation unit 3a based on the information read by the scanner unit 2, and develops the toner image onto the sheet. . Thereafter, the apparatus main body A conveys the sheet to the fixing unit 6 and heat-presses the sheet to permanently fix the toner image on the sheet. Then, the apparatus main body A sends the sheet to the sheet post-processing apparatus B as it is in the single-sided recording mode in which a toner image is formed on one side of the sheet. In the double-sided recording mode in which the toner image is formed on both sides of the sheet, the apparatus main body A switches back the sheet on which the image is recorded on one side, and then conveys the sheet to the retransmission path 7 again. The sheet is conveyed to the image forming unit 3 to form an image on the other side, and then sent to the sheet post-processing apparatus B. The apparatus main body A sends a signal such as a sheet size to the sheet post-processing apparatus B before sending the sheet to the sheet post-processing apparatus B, and switches a path in the sheet post-processing apparatus B to the sheet post-processing apparatus B in advance. Let it be done.

  The sheet can be fed not only from the sheet cassette 4 but also manually from the multi-tray 8.

  As shown in FIG. 2, the sheet post-processing apparatus B is configured by, for example, a conveyance aligning unit C and a trimmer unit D which are supply units, and selectively performs glued bookbinding and cutting in addition to the normal discharge mode. 3 sides other than the glued side of the sheet bundle can be cut. Note that the sheet post-processing apparatus B does not necessarily require the conveyance alignment unit C. It may only be possible to cut the sheet bundle. Further, the trimmer unit D does not necessarily need to cut the three sides of the sheet bundle. Only one side may be cut.

  In the normal mode, the sheet P discharged from the apparatus main body A of the copying machine G to the sheet post-processing apparatus B is transported to the transport roller pairs 10a, 10b, 10c, and 10d and is discharged to the stack tray 11. In the glue binding mode, the sheet P is discharged to the stacking tray E after being subjected to a predetermined process described later.

[Control unit of sheet post-processing apparatus]
FIG. 15 shows a control system of the sheet post-processing apparatus B. In FIG. 15, as a control unit of the present embodiment, for example, on the input side of the CPU 200, a carry-in sheet detection sensor 111 (see FIGS. 1 and 2) that detects a sheet sent from the apparatus main body A of the copying machine G to the conveyance alignment unit C. ), A discharge sensor 22 for detecting a sheet sent to the alignment vertical path 35 (see FIG. 2), a registration leading end sensor 23a for detecting whether or not the sheet has been sent to the registration roller pair 23, and the sheet in the sheet conveyance direction. A registration sensor 24 (see FIG. 4) that detects movement in the intersecting direction, a photosensor 50f (see FIG. 7) that detects movement of the moving body 50n, and a photosensor 50i that detects movement of the cradle 50a and the rack 50b. A swing-up detection sensor 66a (see FIG. 8) that detects that the swing unit 61 has rotated upward, and the swing unit. 1 is discharged from the horizontal sensor 66b that detects the downward rotation, the inlet guide opening / closing sensor 68d that detects the movement of the inlet guide 67, the inlet sensor 68e that detects the sheet sent to the inlet guide 67, and the rotary stage 60. A sheet discharge sensor 75 for detecting the sheet, a current detection sensor (may be an ammeter) 98 for measuring the load current of the cutting motor 83, and a blade position sensor for detecting that the cutting blade 80 (see FIG. 10) is lowered. 85, a communication device 207 for transmitting sheet size data designated by the user to the CPU 200 is electrically connected.

  On the other hand, on the output side of the CPU 200, a cover motor 37 (see FIG. 4) for moving the cover sheet P2 through the drivers D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, and crease Shutter motor 28 that operates the base 34 (see FIG. 6), swing motor 62a that rotates the swing unit 61 (see FIG. 8), inlet guide motor 68a that moves the inlet guide 67 (see FIG. 8), and gripper unit A holding release motor 147 for releasing the holding of the bookbinding sheet bundle by 70, a horizontal movement motor 79 (see FIG. 9) for moving the gripper unit 70, a vertical motor 88 (see FIG. 11) for raising and lowering the sheet presser 93, and a cutting blade 80 are provided. A cutting motor 83 (see FIG. 10) to be moved, a mat rotation motor 95a to rotate the mat 94 (see FIG. 12), and a rotation guide Rotating motor 76 for rotating A 78 (see FIG. 8), a plunger (not shown) or the like is are electrically connected, respectively.

  Furthermore, the CPU 200 includes, for example, a read only memory (ROM) 201 and a random access memory (RAM) 202 which are memories as storage units. The ROM 201 stores, for example, a control program corresponding to a cutting control procedure for each size of the bookbinding sheet bundle shown in FIG. The ROM 201 can store a cutting completion current value corresponding to the number of sheets to be cut, which will be described later. Furthermore, the ROM 201 can also store a cutting completion current value corresponding to the number of times of cutting a bookbinding sheet bundle. The RAM 202 is a part for temporarily storing information such as the sheet size input by the user. The RAM 202 can store the number of sheets cut up to now, the number of times of bookbinding sheet bundle cutting, and the like.

  When the signals of the sensors and the ROM 201 and RAM 202 are input, the CPU 200 executes a control program based on the signals, and controls each motor, a plunger (not shown) and the like so that cutting control and the like can be performed. It is supposed to be. The CPU 200 is also configured to control the entire sheet post-processing apparatus B by exchanging signals with the control unit 9 in the apparatus main body A of the copying machine G.

[Loading on the alignment vertical path]
In the bookbinding mode, the sheet P discharged from the apparatus main body A is fed to the bookbinding intermediate paper path 14 by the guidance of the first flapper 12 and the second flapper 13 shown in FIGS. The first flapper 12 switches between the non-sort path 15 and the cover path 16. The second flapper 13 switches between the bookbinding middle paper path 14 and the cover paper path 16.

  After the sheet P conveyed by the conveying roller pair 10a, 17a, 17b is discharged to the alignment vertical path 35 by the discharge roller pair 18, the trailing edge of the sheet P is made the trailing edge stopper 20 by the half moon roller 19 and the discharge roller pair 18. The sheet is returned to the contact position and aligned in the sheet conveying direction (rear end alignment). Then, the sheet P is pushed in the sheet center direction by, for example, the aligning plate 21 serving as aligning means, and is aligned in the direction intersecting the sheet conveying direction. That is, the sheet P is pushed in the center direction in the width direction of the sheet (direction intersecting the sheet conveyance direction), and the side edges of the sheets are aligned.

  When the trailing edge of the sheet P passes through the discharge roller pair 18, the rotation speed of the discharge roller pair 18 is controlled to be low. Thus, the sheet P discharged to the alignment vertical path 35 is reliably drawn into the alignment vertical path 35 by the rotation of the half-moon roller 19 so that the trailing edge alignment is performed reliably.

  It is assumed that the sheet has passed the discharge roller pair 18 when a predetermined time has passed after the trailing edge of the sheet has passed the discharge sensor 22 or when the rotation speed of the motor has reached a predetermined rotation speed. .

[Half Moon Roller]
Next, the meniscal roller 19 that pulls back the sheet P discharged onto the alignment vertical path 35 in the direction opposite to the discharge direction will be described.

  As shown in FIG. 3, the half-moon roller 19 is formed in a shape cut out in a half-moon shape. The half-moon roller 19 normally has a cutout portion of the half-moon roller 19 on the alignment vertical path 35 side so as not to prevent the discharge of the sheet P discharged from the discharge roller pair 18. The half-moon roller 19 rotates in the direction opposite to the sheet discharge direction of the discharge roller pair 18 every time one sheet P is discharged onto the alignment vertical path 35, and the trailing edge of the sheet P on the alignment vertical path 35. The sheet P is pulled back by the frictional force generated between the sheet P and the sheet P. That is, the half-moon roller 19 pulls back the sheet P in the direction in which the sheet P falls.

[Alignment vertical path board]
The alignment vertical path plate 36 can be moved in the direction of the arrow a shown in FIG. 3 by an alignment vertical path motor (not shown), and the path interval of the alignment vertical path 35 is adjusted. The alignment vertical path plate 36 keeps the contact pressure with respect to the uppermost sheet discharged on the alignment vertical path 35 by the half moon roller 19 in accordance with the number of sheets discharged on the alignment vertical path 35. The alignment vertical path plate 36 is moved in the direction in which the path spreads.

[Operation timing of half-moon roller]
The operation timing of the half-moon roller 19 is after the discharge roller pair 18 releases the trailing edge of the sheet P. Specifically, the half-moon roller 19 rotates in the direction opposite to the sheet discharge direction after a predetermined time has elapsed after the trailing edge of the sheet P passes the discharge sensor 22 provided on the upstream side of the discharge roller pair 18. It has become.

[Cover path]
The sheet P discharged from the apparatus main body A is guided to the cover path 16 by the first flapper 12 and the second flapper 13. As shown in FIGS. 2 (see FIG. 3) and FIG. 4, a registration roller pair 23 and a registration leading edge sensor 23a located upstream of the registration roller pair 23 are disposed in the middle of the cover path 16. The registration roller pair 23 is stopped when the cover sheet P2 is guided to the cover path 16, but starts rotating after a predetermined time after the front end of the cover sheet P2 contacts the registration roller pair 23. Whether or not the front end of the cover sheet P2 has come into contact with the registration roller pair 23 is determined for a predetermined time after the cover sheet P2 passes the registration front end sensor 23a or by detecting the motor rotation speed. Yes. By controlling the registration roller pair 23 to stop, a loop can be formed at the front end of the cover sheet P2 guided to the cover path 16 to correct the skew.

  The registration roller pair 23 can be moved in a direction perpendicular to the sheet conveying direction (crossing direction, sheet width direction) by a cover motor 37 and a rack 38. The registration roller pair 23 moves in the direction of the arrow b in FIG. 4 in a state where the registration roller pair 23 sandwiches and conveys the cover sheet P2 after the rear end of the cover sheet P2 has passed through the conveyance roller pair 17a. After the light is shielded, it moves in the direction of the arrow c to open the registration sensor 24, and then moves a certain amount and stops. Since the registration sensor 24 is disposed at the sheet end position (side end position) of the sheet bundle P1 in the alignment vertical path 35, the registration sheet 24 and the sheet bundle in the alignment vertical path 35 are located in the cover path 16. P1 moves to a position that is deviated by a certain amount in the direction perpendicular to the sheet conveyance direction (the intersecting direction, the width direction of the sheet or sheet bundle). The registration roller pair 23 receives the paper size signal from the apparatus main body A, stops the cover sheet P2 in the cover path 16 by conveying a specified amount according to the paper size.

[Gripper]
The gripper 41 shown in FIGS. 3 and 6 is located below the alignment vertical path 35, and has a function of gripping the sheet bundle P1 stacked on the alignment vertical path 35 and guiding it to the cover sheet P2.

[Glued unit]
FIG. 5 is a schematic plan view of the pasting unit 25. The gluing unit 25 includes a gutter 25a, a gluing roller 25b, a gluing 25c, a gutter heater 25d, a shaft 25e, a gutter driving unit 25f, and the like.

  The eaves 25a are moved by the eaves drive unit 25f in the sheet width direction perpendicular to the sheet conveying direction along the shaft 25e so as to move more than the sheet width. The lower edge side is the retracted position. As the collar 25a moves from the first retracted position to the second retracted position, a part of the link 26 engaged with the rear end stopper 20 is pushed by a part of the collar 25a so that the rear end stopper 20 is illustrated. The sheet bundle P1 is moved away from the lower part of the sheet bundle P1. The glue roller 25b is attached to the collar 25a, and rotates with the movement of the collar 25a.

  The saddle heater 25d is attached to the outside of the saddle 25a. The scissors heater 25d heats the scissors 25a and melts the glue 25c in the scissors 25a at the start of the bookbinding mode. The glue roller 25b is rotated by the movement of the collar 25a by the collar drive unit 25f, and the glue 25c melted over the entire outer peripheral surface of the glue roller 25b is spread.

  The sheet bundle P1 stacked in the alignment vertical path 35 is held by the gripper 41 (see FIG. 3), and the collar 25a moves from the first retracted position to the second retracted position, and the trailing end stopper 20 is moved. By retracting from the lower part of the sheet bundle P1, glue 25c is applied to the lower end surface of the sheet bundle P1 by the gluing unit 25.

[Bookbinding process]
As shown in FIG. 6A, the shutter path 27 is located downstream of the cover path 16 (see FIG. 2), and closes the cover path 42 when the cover sheet P2 is being conveyed.

  During the bookbinding process, as shown in FIG. 6B, the shutter motor 28 drives the shutter rack 29, and the shutter path 27 and the spring 30 that pulls the shutter rack 29 in one direction are connected to the cover attachment path. 42 is moved to the opening position. The shutter path 27 having opened the cover attachment path 42 comes into contact with a stopper (not shown) and stops.

  The sheet bundle P1 held by the gripper 41 is applied with glue 25c by the gluing unit 25 shown in FIG. Thereafter, the gripper 41 moves the glued sheet bundle P1 so as to come into pressure contact with the cover sheet P2 on the crease table 34, thereby bringing the sheet bundle P1 into pressure contact with the cover sheet P2.

  Next, as shown in FIG. 6C, when the shutter motor 28 is further driven, the cam 32 rotated by the belt 31 from the shutter motor 28 is further rotated, and the creasing tables 34 and 34 are moved by the guide shaft 33. Move them closer together. The crease table 34 performs crease for a certain time. Thereby, the bookbinding sheet bundle P3 is completed.

  The crease table 34 is provided with a relief mechanism so as to cope with a change in the paper thickness. Further, as shown in FIG. 6 (d), the creasing bases 34 and 34 are retracted away from each other by continuing to rotate the cam 32. As a result, the bookbinding sheet bundle P3 is pushed downstream by the push rollers 39 and conveyed to the bundle curvature path 40 (see FIG. 2).

[Buffer mechanism]
The buffer machine 50 will be described with reference to FIGS. The buffer machine 50 is configured to temporarily retract the sheet P conveyed from the apparatus main body A of the copying machine G at the time of sheet post-processing such as glue binding. The cradle 50a for receiving the sheet of the buffer mechanism 50 moves in the same direction and a perpendicular direction (a crossing direction, a sheet width direction) with respect to the sheet conveyance direction. In FIG. 7, it is assumed that the discharge roller pair 18, the half moon roller 19, the rack 50e, and the photosensor 50f do not move.

  In order to move the cradle 50a in the same direction as the sheet conveying direction, first, only the electromagnetic clutch gear 50c is set in a rotational force transmitting state so that the rotation of a motor (not shown) is transmitted to the gear 50d. Then, the gear 50d rolls and rotates on the fixed rack 50e. As a result, the respective parts of the buffer mechanism 50 excluding the rack 50e are integrally moved in the same direction as the sheet conveying direction. That is, the cradle 50a moves in the same direction as the sheet conveying direction. At this time, detection of the movement position in the same direction as the sheet conveyance direction of the buffer mechanism 50 excluding the rack 50e is detected by the photosensor 50f and the protrusion 50k on the moving body 50n that shields the photosensor 50f. The movement control based on the set position is performed.

  In addition, in order to move the cradle 50a in a direction perpendicular to the sheet conveying direction (crossing direction, sheet width direction), only the electromagnetic clutch gear 50g is set in a rotational force transmitting state, and the rotation of the motor is changed to the gear 50h. The rack 50b is moved. As a result, the cradle 50a moves in a direction perpendicular to the sheet conveying direction. At this time, the moving position of the cradle 50a in the direction perpendicular to the sheet conveying direction by the photosensor 50i provided on the moving body 50n and the protrusion 50m protruding from one end of the rack 50b that shields the photosensor 50i. And movement control based on the detected position are performed. The cradle 50a of the buffer mechanism 50 is retracted to the home position outside the width of the sheet P in FIG. 7 except when the sheet P is buffered, so that it does not hinder the conveyance of the sheet. ing.

  The basic operation of the buffer mechanism 50 will be described. As shown in FIG. 3, when the sheet bundle P <b> 1 is stacked and aligned with the trailing end stopper 20 and is in the alignment vertical path 35 and is not discharged from the alignment vertical path 35, the buffer mechanism 50 continues from the apparatus main body A. In order to buffer the sheet P conveyed in this manner, the receiving platform 50a is moved from the home position that does not prevent the conveyance of the sheet P to the position where the sheet P is received by the rotation of the gear 50h and the movement of the rack 50b shown in FIG. Move the slide.

  When the sheet bundle P1 is discharged from the alignment vertical path 35 and the sheet bundle P1 is no longer on the trailing edge stopper 20, the buffer mechanism 50 moves the receiving base 50a toward the sheet conveying direction and the downstream side, and toward the trailing edge stopper 20. Move. When the rear end of the buffered sheet P is supported by the rear end stopper 20, the buffer mechanism 50 stops the movement of the cradle 50a and retracts the cradle 50a to the home position. The buffer mechanism 50 repeats the above operation until the target number of bookbinding copies is completed.

[Rotating stage]
Next, the rotary stage 60 will be described with reference to FIGS. 8A, 8B, and 8C. The rotary stage 60 rotates the bound bookbinding sheet bundle P3 and conveys it into the trimmer unit D.

  As shown in FIG. 8A, the oscillating unit 61 in the rotary stage 60 causes the rotational force of the oscillating motor 62a to move from the oscillating elevator gear 62b to the oscillating elevator belt 62c by starting the oscillating motor 62a. Via a swing drive belt (not shown) that is transmitted to a swing drive stage gear (not shown) and spans between the rotary shaft 63 and the link shaft 64. By being transmitted to the link mechanism, the right end side of FIG. The rise of the swing unit 61 is detected by the swing rise detection sensor 66a detecting the protrusion 65 of the swing unit 61. The CPU 200 stops the swing motor 62a when it receives a signal from the swing rise detection sensor 66a that detects the protrusion 65. The swing unit 61 stands by at the position shown in FIG.

  Above the swing unit 61, an inlet guide 67 that is an inlet into the trimmer unit D is disposed. The inlet guide motor 68a is started under the control of the CPU 200, rotates the inlet guide gear 68b, and moves the inlet rack 68c connected to the inlet guide 67. The inlet guide motor 68a continues to rotate, and when the inlet guide opening / closing sensor 68d detects the inlet rack 68c, the rotation is stopped under the control of the CPU 200 to stop the opening movement of the inlet guide 67. The inlet guide 67 stands by in an open state.

  When the bookbinding sheet bundle P3 bound in the bookbinding process is sent from the conveyance alignment unit C to the entrance guide 67 and detected by the entrance sensor 68e, the CPU 200 detects the entrance guide motor based on the detection signal of the entrance sensor 68e. 68a is rotated to bring the inlet guide 67 close to the bookbinding sheet bundle P3 and press the inlet driven roller 69a against the bookbinding sheet bundle P3. Then, the bundle conveying roller 69b rotates in the direction of the arrow shown in FIG. 8A, and sends the bookbinding sheet bundle P3 to the rotation stage 60.

  The bundle conveying roller 69b conveys the bookbinding sheet bundle P3 by a certain amount, and then stops conveying the bookbinding sheet bundle P3 while the bookbinding sheet bundle P3 is pressed by the inlet driven roller 69a of the inlet guide 67.

  Next, the bookbinding sheet bundle P <b> 3 is sandwiched by the gripper unit 70 and conveyed to the paper discharge belt 71. The bookbinding sheet bundle P3 securely reaches the paper discharge belt 71 by being nipped and conveyed. The gripper unit 70 is provided on the support plate 141 shown in FIG. The support plate 141 is provided on a pair of belts 144 that spans a pair of pulleys 142 and 143. The pulley 142 is rotated by a horizontal movement motor 79. Therefore, the gripper unit 70 is moved in the left-right direction in FIGS. 8 and 9 by the horizontal movement motor 79.

  The gripper unit 70 has a holding piece 145 that holds the bookbinding sheet bundle P3 with the rotation guide gear 78. The clamping piece 145 is urged toward the rotation guide gear 78 by a spring 146. The clamping piece 145 is separated from the rotation guide gear 78 by the rotation of the clamping release motor 147 against the spring 146.

  The bookbinding sheet bundle P3 conveyed to the paper discharge belt 71 is pressed in the direction of the arrow in FIG. 8B by a surface pressing unit 72 that can move in the approaching and separating direction with respect to the bookbinding sheet bundle by a motor (not shown). Further, the air pressing unit 73 is also pressed by the motor of the surface pressing unit 72 so that it can move toward and away from the bookbinding sheet bundle. Thus, after the surface pressing operation and the air venting operation of the bookbinding sheet bundle P3 are performed on the bookbinding sheet bundle P3, the COU 200 (see FIG. 15) holds the bookbinding sheet bundle P3 by the gripper unit 70. The paper discharge belt 71 is circulated by an unillustrated motor in the direction of the arrow in FIG. 8B, and the glued end portion P3a of the bookbinding sheet bundle P3 is abutted against the resist removing plate 74 that can move up and down. Then, a resist removing operation for the bookbinding sheet bundle P3 is performed. That is, the skew of the bookbinding sheet bundle P3 is corrected straightly.

  At the same time, since the paper discharge sensor 75 detects the glued end portion P3a of the bookbinding sheet bundle P3, the CPU 200 circulates the paper discharge belt 71 for a predetermined time based on the detection signal, and then stops the circulation. Then, the CPU 200 moves and stops the gripper unit 70 to the rotation center position of the bookbinding sheet bundle P3, and causes the gripper unit 70 to hold the bookbinding sheet bundle P3.

  After the gripper unit 70 holds the bookbinding sheet bundle P3, the swing motor 62a shown in FIG. 8A is started. In the swing unit 61, when the swing motor 62a is started, the rotational force of the swing motor 62a is transmitted from the swing lift gear 62b to the swing drive stage gear (not shown) via the swing lift belt 62c. Furthermore, the right end of FIG. 8 (c) is transmitted to the link mechanism (not shown) around the rotation shaft 63 by the swing drive belt (not shown) spanning between the rotation shaft 63 and the link shaft 64. The side descends. The descent of the swing unit 61 is detected by the horizontal sensor 66b detecting the protrusion 65 of the swing unit 61. When receiving a signal from the horizontal sensor 66b that detects the protrusion 65, the CPU 200 stops the swing motor 62a. The swing unit 61 stands by at the position shown in FIG.

  As shown in FIG. 8C, the gripper unit 70 sandwiches the bookbinding sheet bundle P3 and moves in the arrow direction by a horizontal movement motor 79 (see FIG. 9). The bookbinding sheet bundle P3 is conveyed to a predetermined position in the trimmer unit D and cut. The edge part where the bookbinding sheet bundle P3 is cut is an edge part parallel to the glued edge part P3a.

  After the bookbinding sheet bundle P is cut by the trimmer unit D, the gripper unit 70 moves to a predetermined rotational position as shown in FIG. 9 while holding the bookbinding sheet bundle P3. The gripper unit 70 that has reached the rotation position rotates the bookbinding sheet bundle P3 by 90 degrees in the direction of the arrow in FIG. The gripper unit 70 rotates by receiving the rotational force of the rotary motor 76 shown in FIG. 8C via the rotary gear 77 and the rotary guide gear 78.

  The gripper unit 70 that has rotated the bookbinding sheet bundle P3 by 90 degrees once separates the bookbinding sheet bundle P3 from the trimmer unit D in order to grasp the relationship between the position where the bookbinding sheet bundle P3 is sandwiched and the next cutting position. , And the discharge sensor 75 detects the end of the bookbinding sheet bundle P3. When the sheet discharge sensor 75 detects the end of the bookbinding sheet bundle P3, the gripper unit 70 conveys the bookbinding sheet bundle P3 into the trimmer unit D again. The trimmer unit D cuts the end of the bookbinding sheet bundle P3 that has been conveyed again. At this time, the end portion cut by the trimmer unit is an end portion perpendicular to the gluing step portion P3a.

  After completion of the cutting, the gripper unit 70 again conveys the bookbinding sheet bundle P3 to a predetermined rotation position, and in the same rotation direction as the above-described rotation operation, this time the bookbinding sheet bundle P3 is rotated 180 degrees. Rotate.

  Since the gripper unit 70 grasps the positional relationship between the holding position of the bookbinding sheet bundle P3 and the end portion of the bookbinding sheet bundle P3 in the pre-cutting, after rotating the bookbinding sheet bundle P3 by 180 degrees, the gripper unit 70 cuts again. Transport to position. The trimmer unit D cuts the end of the bookbinding sheet bundle P3 that has been conveyed again. At this time, the edge part which a trimmer unit cuts is a remaining right-angled edge part with respect to the gluing step part P3a.

  The bookbinding sheet bundle P3 cut in three directions is rotated 90 degrees again by the gripper unit 70 by the same operation, and conveyed to the position where the glued end portion P3a of the bookbinding sheet bundle P3 is detected by the paper discharge sensor 75. Is done.

  When the glued end portion P3a of the bookbinding sheet bundle P3 is detected by the paper discharge sensor 75, the gripper unit 70 releases the binding of the bookbinding sheet bundle P3, and the surface pressing unit 72 presses the bookbinding sheet bundle P3. Thereafter, the discharge belt 71 circulates in the direction opposite to the clockwise direction in FIG. 8 and discharges the bookbinding sheet bundle P3 to the stacking tray E.

[Trimmer unit]
Next, the trimmer unit D will be described. The explanation is a side view of the trimmer unit shown in FIG. 10, a diagram for explaining the operation of the sheet bundle presser shown in FIG. 11, a diagram for explaining the operation of discharging the cut sheet waste shown in FIG. 12 to the dust box, Based on the graph showing the load current change of the cutting motor at the time of sheet bundle cutting shown in FIG. 13, the flowchart for explaining the sheet bundle cutting operation shown in FIG. 14, and the control block diagram of the sheet post-processing apparatus B shown in FIG. Do.

  The trimmer unit D is configured to cut the bookbinding sheet bundle P3 conveyed from the rotary stage 60. The rotary stage 60 is an example of a transfer unit. The configuration including the rotary stage 60 and the trimmer unit D is an example of the sheet cutting apparatus H.

  As shown in FIG. 10 and FIG. 15, for example, a current detection sensor 98 which is a load detection means for measuring the load current value of the cutting motor 83 is connected to the cutting motor 83 which is a driving means for driving the cutting blade 80. It is. As shown in FIG. 13, the load current value of the cutting motor 83 changes depending on the state in which the cutting blade 80 is cutting the bookbinding sheet bundle.

  The blade movement region t1 is a time period from when the cutting blade 80 starts to descend until it comes into contact with the bookbinding sheet bundle, and once the large starting current flows through the cutting motor 83, the load current value is small. The state continues.

  The sheet bundle cutting area t2 is a time zone when the cutting blade 80 is cutting the bookbinding sheet bundle. As the cutting blade 80 cuts the bookbinding sheet bundle, the load current value increases. When the cutting blade 80 cuts to a certain thickness, the load current value becomes substantially constant.

  The cutting end region t3 is a time zone when the cutting blade 80 has finished cutting the bookbinding sheet bundle and is in contact with, for example, the mat 94 serving as a receiving means. The cutting blade 80 is received by the mat 94 and cut into it after cutting the bookbinding sheet bundle. In this case, unless the cutting motor 83 stops and reverses, the cutting blade 80 bites into the mat 94 and the load current value increases rapidly. If left in this state, the mechanism that transmits the driving force of the cutting blade 80, the mat 94, and the cutting motor 83 to the cutting blade 80, the mechanism that supports the mat 84, and the like are damaged, or the cutting motor 83 is damaged. There is a risk of burning.

  Therefore, in order to prevent such damage and seizure of the cutting motor 83, the sheet cutting apparatus H of the present embodiment attempts to lower the cutting blade 80 when the cutting blade 80 finishes cutting the bookbinding sheet bundle. It stops using the change of the load current value shown in FIG. That is, when the current detection sensor 98 detects that the current cutting load value, for example, the load current value is I1, in the cutting end region t3, the sheet cutting apparatus H of the present embodiment cuts the sheet by the control of the CPU 200. The motor 83 is stopped and reversely rotated, and the cutting blade 80 is raised and separated from the mat 84. The state where the load current value is I1 is a state where the cutting blade 80 cuts the bookbinding sheet bundle and is lightly touching the mat 94 or slightly bites.

  Therefore, the bookbinding sheet bundle is cut in advance to obtain the load current value of I1, and the load current value I1 is stored in the ROM 201, which is a storage unit, as a cutting completion load value, for example, a cutting completion current value ( S101).

  After the cutting completion current value is stored in the ROM 201 as described above, as shown in FIG. 8C, the bookbinding sheet bundle P3 is transferred from the rotary stage 60 to the trimmer unit D shown in FIG. Be transported. The CPU 200 conveys the bookbinding sheet bundle P3 to the cutting position based on the rotational speed of a horizontal movement motor 79 (see FIG. 9) that moves the gripper unit 70. The detection that the bookbinding sheet bundle P3 has been conveyed to the cutting position may be detected by a sheet detection sensor (not shown) without being based on the rotational speed of the horizontal movement motor 79 (see FIG. 9).

  When the bookbinding sheet bundle P3 is conveyed to the sheet cutting position, the CPU 200 drives the vertical motor 88 shown in FIG. The rotation of the cam 91 moves the link 90 and the attachment member 136 provided with the link 90 to the lower fulcrum position, and lowers the sheet presser 93 via the paper presser spring 92. Even if the sheet presser 93 comes into contact with the bookbinding sheet bundle P3, the cam 91 continues to rotate. For this reason, the paper presser spring 92 is compressed, and the sheet presser 93 presses the bookbinding sheet bundle P3 onto the mat 94 by the elasticity of the paper presser spring 92.

  Since the CPU 200 can determine the lowered position of the sheet presser 93 by the rotation of the vertical motor 88, when the sheet presser 93 presses the bookbinding sheet bundle P3, the cutting motor 83 shown in FIG. 10 is started (S102). Note that the sheet presser 93 pressing the bookbinding sheet bundle P3 may be determined by detecting that the attachment member 136 has been lowered to the bottom dead center with a sensor (not shown).

  The cutting motor 83 moves the nut 185 to the arrow F that is the sheet bundle cutting direction via the spiral shaft 189. A driving plate 186 is integrally provided on the nut 185. The drive plate 186 and the cutting blade 80 are movable up and down with respect to the drive plate 186 by the engagement between the protrusion 190 and the vertical groove 191 having a U-shaped cross section.

  When the drive plate 186 moves in the direction of arrow F, the cutting blade 80 also moves in the same direction. However, since the pair of inclined holes 187 are engaged with a pair of rotatable rollers 188 provided on a fixed part (not shown), the cutting blade 80 moves downward while moving in the direction of arrow F. . That is, the cutting blade 80 descends while moving along the bookbinding sheet bundle P3 to cut the bookbinding sheet bundle P3. The oblique hole 187 is inclined about 30 degrees with respect to the bookbinding sheet bundle.

  When the cutting blade 80 is cutting the bookbinding sheet bundle, the current detection sensor 98 measures the load current value of the cutting motor 83. When the cutting blade 80 finishes cutting the bookbinding sheet bundle, it contacts the mat 94, and the load current value suddenly increases as shown in the cutting end region t3 of the graph of FIG. Therefore, the CPU 200 compares the current load current value W1 with the cutting completion current value I1 stored in advance in the ROM 201, and when the current cutting load current value W1 exceeds the cutting completion current value I1 (S103). The cutting motor 83 is regarded as having been cut (S104).

  If the cutting completion current value I1 is set to the smallest possible value, the amount of biting into the mat 94 by the cutting blade 80 can be reduced and the contact time can be shortened. However, if the cutting blade 80 is used for a long period of time, the cutting edge becomes round and the load current value in the sheet bundle cutting region t2 increases from W1 to W2. Therefore, if the cutting completion current value is set small, W in the region of t2 May exceed the cutting completion current value, and the CPU 200 may erroneously determine that the cutting has been completed.

  Therefore, the counter 200a in the CPU 200 counts the number of sheets to be cut based on the sheet detection operation of the carry-in sheet detection sensor 111, and increases the cutting completion current value from I1 to I2 according to the number of sheets to be cut. Even when the number of sheets increases, the cutting edge becomes round and the cutting load increases, the end of cutting can be detected more accurately, and the contact time between the cutting blade 80 and the mat 94 can be shortened. In this case, when the cutting completion current value is changed from I1 to I2, the cutting completion current value may be finely changed stepwise according to the number of sheets cut. When the cutting completion load value is changed in a fine stepwise manner, the contact time between the cutting blade 80 and the mat 94 can be shortened appropriately according to the number of sheets to be cut. The carry-in sheet detection sensor 111 and the counter 200a are examples of counting means.

  The cutting completion current value corresponding to the number of sheets cut is stored in the ROM 201 in advance, and the CPU 200 stores the number of sheets counted by the counter 200a of the CPU 200 based on the sheet detection operation of the carry-in sheet detection sensor 111 in the ROM 201. The cutting completion current value is calculated in correspondence with the number of cuttings, and when the current value is reached, the cutting motor 83 is stopped. The carry-in sheet detection sensor 111 and the counter 200a are examples of counting means.

  Although the number of sheets to be cut is counted, the number of times of cutting a bookbinding sheet bundle may be counted, and the cutting completion current value may be changed according to the number of counts. The number of times of cutting is counted by the counter 200a of the CPU 200 counting the detection operation of the blade position sensor 85 that detects the lowered cutting blade 80. The blade position sensor 85 and the counter 200a are examples of counting means.

  The cutting load may be detected not only by the current value of the motor, but also by detecting the amount of distortion of the blade receiver with a strain gauge (not shown), for example, to detect the end of cutting.

  After the bookbinding sheet bundle P3 is cut, the CPU 200 drives the vertical motor 88 (see FIG. 11) again to control the rotation of the cam 91 until the link 90 comes to the upper fulcrum position. At the same time, the cutting motor 83 (see FIG. 10) is reversely rotated to raise the cutting blade 80 and away from the mat 94. As shown in FIG. 12, some of the cut sheet waste P4 falls into the dust box 97, but some remains on the mat 94. Therefore, when the mat 94 is rotated in the direction of the arrow from the mat rotation motor 95a via the mat drive belt 95b, the cut sheet waste P4 falls from the mat 94. When the mat 94 is rotated, the cut sheet waste P4 can be forcibly dropped before the pusher 96 in the dust box 97 without leaving the cut sheet waste P4 on the mat 94.

  The cutting sheet waste P4 dropped from the mat 94 due to the rotation of the mat 94 is brought downstream into the dust box 97 by the pusher 96. On the other hand, the bookbinding sheet bundle P3 after the scrap processing rotation operation of the mat 94 is rotated 90 degrees by the rotary stage 60 as described above, and the remaining two sides other than the gluing portion are cut. Therefore, the bookbinding sheet bundle is cut on three sides and discharged from the sheet cutting device H to the stacking tray E (see FIG. 1).

1 is a schematic front sectional view of a copying machine which is an example of an image forming apparatus provided with a sheet post-processing apparatus according to an embodiment of the present invention in an apparatus main body. It is sectional drawing of the sheet | seat post-processing apparatus of this invention. It is a schematic front view of the conveyance alignment unit in the sheet post-processing apparatus of FIG. (A) It is a schematic front view of the whole conveyance alignment unit. (B) It is an enlarged front view of a buffer mechanism. FIG. 3 is a view of a registration roller pair as viewed from the right side in FIG. 2. It is a schematic plan view of a pasting unit. It is a figure for demonstrating the bookbinding process which adhere | attaches a cover sheet on the glued sheet bundle. (A) It is a figure when starting the operation | movement which adhere | attaches a cover sheet | seat on the glued sheet bundle. FIG. 6B is a diagram when the cover sheet passing path is opened and the glued sheet bundle starts to descend. (C) It is a figure when a cover sheet is made to adhere to a pasted sheet bundle. (D) It is a figure when the cover sheet has been bonded to the glued sheet bundle. It is a side view of the buffer mechanism of the alignment vertical path. It is a front view for operation | movement description of a rotation stage. FIG. 6A is a diagram illustrating a state in which a bookbinding sheet bundle has started to be fed from a conveyance alignment unit. FIG. 6B is a diagram illustrating a state when the bookbinding sheet bundle is received from the conveyance alignment unit. (C) It is a figure of the state which conveyed the sheet | seat bundle from the rotation stage to the cutting blade. It is a top view of a rotation stage. It is a side view of a trimmer unit. FIG. 10 is a diagram for explaining the operation of sheet bundle pressing. FIG. 6A is a diagram illustrating a state in which a sheet bundle pressing member presses a bookbinding sheet bundle and a cutting blade starts cutting the bookbinding sheet bundle. (B) It is a figure which shows the state which the sheet | seat bundle presser and the cutting blade left | separated from the bookbinding sheet | seat bundle. It is a figure for demonstrating the operation | movement which drops cutting sheet waste in front of a pusher by the rotation of a mat, and discharges it to a dust box. It is a figure which shows the relationship between the cutting amount when cutting a bookbinding sheet bundle with a cutting blade, and the load current of a cutting motor. It is a flowchart for operation | movement description when cutting a bookbinding sheet bundle with a cutting blade. It is a control block diagram of a sheet post-processing apparatus.

Explanation of symbols

A Copy machine main body (image forming device main body)
B Sheet post-processing device C Conveying alignment unit D Trimmer unit E Stack tray G Copying machine H Sheet cutting device P Sheet P1 Sheet bundle P2 Cover sheet P3 Bookbinding sheet bundle P3a Gluing edge P4 Cutting sheet waste 1 Document feeder 2 Scanner unit 3 Image forming unit (image forming means)
DESCRIPTION OF SYMBOLS 9 Control part 21 Alignment plate 41 Gripper 42 Cover attachment path 50 Buffer mechanism 60 Rotating stage 61 Oscillating unit 70 Gripper unit 72 Surface pressing unit 73 Air vent unit 78 Rotating gear guide 80 Cutting blade 83 Cutting motor (drive means)
85 Blade position sensor (counting means)
94 mat (receiving means)
98 Current detection sensor (load detection means, current measuring device)
111 Carrying sheet detection sensor (counting means)
200 CPU (control means)
200a counter (counting means)
201 ROM (storage means)
202 RAM

Claims (9)

A cutting blade for cutting sheets to be cut such as sheets and sheet bundles;
Receiving means for receiving a cut sheet to be cut by the cutting blade;
Driving means for cutting the cutting blade;
Load detecting means for detecting the cutting load of the driving means;
Storage means for storing the value of the cutting load when the cutting blade cuts the sheet to be cut and arrives at the receiving means; and a cutting completion load value;
Control means for stopping the cutting operation of the drive means when the current cutting load value becomes the cutting completion load value;
A sheet cutting device comprising:   The cutting blade includes a counting unit that counts the number of sheets to be cut, the storage unit stores a cutting completion load value corresponding to the count number, and the control unit sets the current cutting load value to the count number. The sheet cutting device according to claim 1, wherein the cutting operation of the driving unit is stopped when the corresponding cutting completion load value is reached.   The cutting unit includes a counting unit that counts the number of times the cutting sheet is cut, the storage unit stores a cutting completion load value corresponding to the count number, and the control unit sets the current cutting load value to the count number. The sheet cutting device according to claim 1, wherein the cutting operation of the driving unit is stopped when the corresponding cutting completion load value is reached.   The said drive means has a drive motor, The said load detection means has the electric current measuring device which measures the load current of the said drive motor, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Sheet cutting device. Image forming means for forming an image on a sheet;
A sheet cutting device for cutting a sheet on which an image is formed by the image forming unit, a sheet to be cut such as a sheet bundle, and the like.
5. The image forming apparatus according to claim 1, wherein the sheet cutting apparatus is the sheet cutting apparatus according to claim 1. Image forming means for forming an image on a sheet;
A cutting blade for cutting a sheet on which an image is formed by the image forming unit, a sheet bundle such as a sheet bundle, and the like,
Receiving means for receiving a cut sheet to be cut by the cutting blade;
Driving means for cutting the cutting blade;
Load detecting means for detecting a driving load of the driving means;
Storage means for storing the value of the driving load when the cutting blade cuts the cut sheet and reaches the receiving means, as a cutting completion load value;
Control means for stopping the cutting operation of the driving means when the current driving load value becomes the cutting completion load value;
An image forming apparatus comprising:   The cutting unit includes a counting unit that counts the number of sheets to be cut, the storage unit stores a cutting completion load value corresponding to the count number, and the control unit stores the current cutting load value as the count number. The image forming apparatus according to claim 6, wherein the cutting operation of the driving unit is stopped when the cutting completion load value corresponding to the value is reached.   The cutting unit includes a counting unit that counts the number of times the cutting sheet is cut, the storage unit stores a cutting completion load value corresponding to the count number, and the control unit sets the current cutting load value to the count number. The image forming apparatus according to claim 6, wherein the cutting operation of the driving unit is stopped when the corresponding cutting completion load value is reached. The said drive means has a drive motor, and the said load detection means has the electric current measuring device which measures the load current of the said drive motor, The any one of Claim 6 thru | or 8 characterized by the above-mentioned. Image forming apparatus.

Images