JP2016141560A - Sheet processor, image forming system, control program of sheet processor and control method of sheet processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress vibration which is generated when moving sheets.SOLUTION: A sheet processor comprises: a sheet placing part which places transported sheets thereon: a sheet moving part which moves the placed sheets; a drive part which drives the sheet moving part; a drive form decision part which decides drive forms of the drive part according to a placing status of the sheets in the sheet placing part; and a drive control part 711 which controls the drive of the drive part following the decided drive forms. The drive form decision part decides first acceleration at a start of the acceleration of the drive part, and synthesized acceleration which is obtained by synthesizing second acceleration to the first acceleration by retarding a time of a half cycle amount of natural vibration which is generated at the sheet drive part according to the placing status at the acceleration of the drive part as the drive forms of the drive part.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a sheet processing apparatus, an image forming system, a control program for the sheet processing apparatus, and a control method for the sheet processing apparatus.

  In recent years, image forming apparatuses that perform image forming processing on sheets, post-processing apparatuses that perform post-processing such as binding processing, folding processing, bookbinding processing, and punching processing on sheets, and sheet feeding devices that feed sheets to these devices A sheet processing apparatus such as an original reading apparatus for reading an original is an indispensable device.

  Among such sheet processing apparatuses, there is known a sheet processing apparatus that moves the sheet stacking unit in order to match the height of the sheet bundle and the height of the sheet conveyance path or adjust the stacking position of the sheet bundle. (For example, refer to Patent Document 1).

  However, such a sheet processing apparatus generates vibration when the sheet stacking unit is moved. Therefore, such a sheet processing apparatus has a problem that noise is generated by the movement of the sheet stacking unit.

  Also, in such a sheet processing apparatus, if the sheet processing is performed during the generation of vibration due to the movement of the sheet stacking unit, the sheet processing accuracy is deteriorated. Therefore, the start of processing on the next sheet is waited until the vibration is reduced. There is a problem that productivity is reduced. In addition, in such a sheet processing apparatus, various problems may occur due to vibration generated when the sheet stacking unit is moved.

  Such a problem is not limited to the sheet stacking unit, but may also occur in the sheet discharge unit that discharges the sheet by moving while contacting the sheets stacked on the sheet stacking unit.

  The present invention has been made to solve such a problem, and an object of the present invention is to suppress vibrations that occur when a sheet is moved.

  In order to solve the above-described problems, an aspect of the present invention provides a sheet stacking unit that stacks conveyed sheets, a sheet moving unit that moves the stacked sheets, and a driving unit that drives the sheet moving unit. A driving mode determining unit that determines a driving mode of the driving unit according to a sheet stacking state in the sheet stacking unit, and a drive control unit that controls driving of the driving unit according to the determined driving mode. It is characterized by providing.

  According to the present invention, it is possible to suppress vibration that occurs when the sheet is moved.

1 is a diagram illustrating an example of an operation mode of an image forming system according to an embodiment of the present invention. It is sectional drawing which shows the post-processing apparatus which concerns on embodiment of this invention from the main scanning direction. It is a front view which shows the end surface binding processing tray which concerns on embodiment of this invention from a sheet | seat stacking surface. It is a perspective view which shows the end surface binding processing tray which concerns on embodiment of this invention from a sheet | seat stacking surface. It is a perspective view which shows the end surface binding processing tray which concerns on embodiment of this invention from a sheet | seat stacking surface. It is sectional drawing which shows the end surface binding processing tray which concerns on embodiment of this invention from the main scanning direction. It is a side view which shows the stapler which concerns on embodiment of this invention from a subscanning direction. FIG. 3 is a perspective view of a shift tray moving mechanism according to an embodiment of the present invention. It is a perspective view of the raising / lowering mechanism of the shift tray which concerns on embodiment of this invention. It is a block diagram which shows typically the hardware constitutions of the post-processing apparatus which concerns on embodiment of this invention. It is a block diagram which shows typically the functional structure of the post-processing apparatus which concerns on embodiment of this invention. It is a figure which shows the drive profile of a tray motor when the conventional post-processing apparatus moves or raises / lowers a shift tray, and the speed fluctuation | variation of a shift tray. It is a figure for demonstrating the procedure in which the post-processing apparatus which concerns on embodiment of this invention produces the drive profile of a tray motor. It is a flowchart for demonstrating the procedure in which the post-processing apparatus which concerns on embodiment of this invention produces the drive profile of a tray motor. It is a figure for demonstrating the procedure in which the post-processing apparatus which concerns on embodiment of this invention produces the drive profile of a tray motor. It is a flowchart for demonstrating the procedure in which the post-processing apparatus which concerns on embodiment of this invention produces the drive profile of a tray motor. It is a figure for demonstrating the procedure in which the post-processing apparatus which concerns on embodiment of this invention produces the drive profile of a tray motor. It is a figure which shows the position deviation at the time of driving a tray motor with the drive profile which the post-processing apparatus which concerns on embodiment of this invention produced. It is a figure which shows the position deviation of the shift tray in the post-processing apparatus which concerns on embodiment of this invention. It is a figure which shows the position deviation of the shift tray in the post-processing apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the stacking condition of the sheet bundle loaded on the shift tray in the post-processing apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the stacking condition of the sheet bundle loaded on the shift tray in the post-processing apparatus which concerns on embodiment of this invention. It is a figure which shows the position deviation of the shift tray in the post-processing apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the procedure in which the post-processing apparatus which concerns on embodiment of this invention produces a drive profile. It is a figure which shows the drive profile of a discharge belt drive motor when the post-processing apparatus which concerns on embodiment of this invention moves a discharge nail at the time of discharge operation of a sheet bundle, and the speed fluctuation of a discharge nail. It is a figure for demonstrating the drive profile for suppressing the vibration of the discharge claw which the post-processing apparatus concerning embodiment of this invention generate | occur | produces at the time of sheet bundle contact. It is a figure for demonstrating the drive profile for suppressing the vibration of the discharge claw which the post-processing apparatus concerning embodiment of this invention generate | occur | produces at the time of sheet bundle contact. It is a figure which shows the position deviation at the time of driving a discharge belt drive motor with the normal drive profile which the post-processing apparatus which concerns on embodiment of this invention produced. It is a figure which shows the positional deviation of the discharge claw in the post-processing apparatus which concerns on embodiment of this invention. It is a figure which shows the normal drive profile which the post-processing apparatus based on embodiment of this invention produced using the pre-shape system, and the drive profile created in consideration of the natural vibration at the time of sheet bundle contact. It is a figure which shows the normal drive profile which the post-processing apparatus based on embodiment of this invention produced using the pre-shape system, and the drive profile created in consideration of the natural vibration at the time of sheet bundle contact. It is a figure which shows the normal drive profile which the post-processing apparatus based on embodiment of this invention produced using the pre-shape system, and the drive profile created in consideration of the natural vibration at the time of sheet bundle contact. It is a figure which shows the normal drive profile which the post-processing apparatus based on embodiment of this invention produced using the pre-shape system, and the drive profile created in consideration of the natural vibration at the time of sheet bundle contact. It is a flowchart for demonstrating the process at the time of the post-processing apparatus which concerns on embodiment of this invention performing discharge | release operation | movement.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, an operation mode of the image forming system according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating an example of an operation mode of the image forming system according to the present embodiment.

  As shown in FIG. 1, the image forming system according to the present embodiment includes an image forming apparatus PR, a document reading apparatus PA, a post-processing apparatus PD, and a sheet supply apparatus PB. Note that the image forming apparatus PR, the document reading apparatus PA, the post-processing apparatus PD, and the sheet supply apparatus PB are connected via a communication port, and perform communication via the communication port.

  The image forming apparatus PR is an MFP (Multi Function Peripheral) that can be used as a printer, a facsimile, a scanner, and a copier by providing an imaging function, an image forming function, a communication function, and the like. Specific modes of the image forming mechanism in the image forming apparatus PR according to the present embodiment include an electrophotographic method and an ink jet method.

  The post-processing device PD is a post-processing mechanism that performs post-processing such as binding processing, folding processing, and bookbinding processing on a sheet on which an image has been formed by the image forming apparatus PR. The sheet bundle P1 discharged from the post-processing device PD is sequentially stacked on the shift tray 202. That is, in the present embodiment, the post-processing device PD functions as a sheet processing device, a sheet discharge device, and a sheet stacking device. The post-processing device PD receives various parameters necessary for control, such as operation information, paper information, and paper conveyance information, from the image forming device PR via the communication port.

  The document reader PA includes an automatic document feeder that automatically conveys a document to be read, and reads a document that is automatically conveyed from the automatic document feeder. The sheet supply device PB supplies the sheet to the image forming apparatus PR. The sheet supply device PB includes a case in which the image forming apparatus PR and the housing are used together, and a sheet feeding device PB that is separate from the image forming apparatus PR.

  Next, the configuration of the post-processing device PD according to the present embodiment will be described with reference to FIG. FIG. 2 is a cross-sectional view showing the post-processing apparatus PD according to the present embodiment from the main scanning direction.

  The post-processing device PD according to the present embodiment is attached to a side portion of the image forming device PR. Then, the sheet discharged from the image forming apparatus PR is guided to the post-processing apparatus PD.

  The post-processing device PD includes a transport path A, a transport path B, a transport path C, a transport path D, and a transport path H. The post-processing apparatus PD first transports the sheet discharged from the image forming apparatus PR to a transport path A having a post-processing unit that performs post-processing on the sheet. This post-processing means is a punch unit 100 as a punching means in this embodiment.

  The conveyance path B is a conveyance path that leads to the upper tray 201 through the conveyance path A, and the conveyance path C is a conveyance path C that leads to the shift tray 202. The conveyance path D is a conveyance path D that leads to a processing tray F that performs alignment, stapling, and the like (hereinafter also referred to as “end face binding processing tray F”). The conveyance path A is distributed to the conveyance paths B, C, and D by the branch claw 15 and the branch claw 16, respectively.

  The post-processing device PD according to this embodiment includes a punch unit 100, a jogger fence 53, an end-face stitching stapler S1, a saddle stitching upper jogger fence 250a, a saddle stitching lower jogger fence 250b, a saddle stitching stapler S2, a shift tray 202, and a folding plate 74. A folding roller 81 is provided.

  The punch unit 100 punches a sheet. The jogger fence 53 and the end face binding stapler S1 perform sheet alignment and edge binding. The saddle stitching lower jogger fence 250b and the saddle stitching stapler S2 perform sheet alignment and saddle stitching. The shift tray 202 sorts sheets. The folding plate 74 and the folding roller 81 perform the middle folding.

  Therefore, post-processing apparatus PD selects according to the process which performs the conveyance path A, the conveyance path B, the conveyance path C, and the conveyance path D following this. The conveyance path D includes a sheet storage portion E. On the downstream side of the conveyance path D, an end face binding processing tray F, a saddle stitching middle folding processing tray G, and a paper discharge conveyance path H are provided.

  In the conveyance path A common to the upstream of the conveyance path B, the conveyance path C, and the conveyance path D, an inlet sensor 301 that detects a sheet received from the image forming apparatus PR, an inlet roller 1, a punch unit 100, The punch and waste hopper 101, the conveying roller 2, the first and second branching claws 15, and the branching claws 16 are sequentially arranged.

  The first and second branch claws 15 and 16 are held in an initial state as shown in FIG. 2 by springs, and are driven by turning on the first and second solenoids, respectively. The first and second branching claws 15 and 16 change the combination of the branching directions according to ON / OFF of the first and second solenoids, so that the sheet is transferred to the conveyance path B, the conveyance path C, and the conveyance path D. Sort out.

  When the post-processing device PD guides the sheet to the conveyance path B, the post-processing device PD keeps the state shown in FIG. 2, that is, the first solenoid is in the OFF state (the first branch claw 15 is in the initial state). As a result, the sheet is discharged from the transport roller 3 to the upper tray 201 via the paper discharge roller 4.

  When the post-processing device PD guides the sheet to the conveyance path C, the first and second solenoids are turned on from the state shown in FIG. 2 (the second branching claw 16 is in the initial state), The branch claw 15 is turned upward and the branch claw 16 is turned downward. Thus, the sheet is conveyed to the shift tray 202 side via the conveying roller 5 and the discharge roller pair 6 (6a, 6b). In this case, the sheets are sorted.

  Sheets are sorted in the shift tray paper discharge unit located at the most downstream portion of the post-processing device PD. Sheet sorting is performed by the discharge roller pairs 6a and 6b, the return roller 13, the paper surface detection sensor 330, the shift tray 202, the shift mechanism, and the shift tray lifting mechanism. The shift mechanism reciprocates the shift tray 202 in a direction orthogonal to the sheet conveyance direction. The shift tray lifting mechanism moves the shift tray 202 up and down. That is, in this embodiment, the shift tray 202 functions as a sheet stacking unit and a sheet moving unit.

  When the post-processing apparatus PD guides the sheet to the conveyance path D, the first solenoid that drives the first branch claw 15 is turned ON, and the second solenoid that drives the second branch claw is turned OFF. The branch claw 15 is turned upward and the branch claw 16 is turned downward. As a result, the sheet is guided from the conveying roller 2 to the conveying path D through the conveying roller 7.

  The sheet guided to the conveyance path D is guided to the end face binding processing tray F. The sheet subjected to alignment and stapling in the end face binding processing tray F is guided by the guide member 44 to the shift path 202, and is fed to the shift tray 202. To the binding processing tray G ”).

  When guided to the shift tray 202, the sheet guided to the conveyance path D is discharged from the discharge roller pair 6 to the shift tray 202. In addition, when the sheet guided to the conveyance path D is guided to the saddle stitching processing tray G side, the sheet is folded and bound by the saddle stitching processing tray G, passes through the discharge conveyance path H, and is discharged from the discharge roller 83 to the lower tray. The sheet is discharged to 203.

  On the other hand, a branch claw 17 is disposed in the conveyance path D and is held in a state as shown in FIG. 2 by a low load spring. After the trailing edge of the sheet conveyed by the conveyance roller 7 passes through the branching claw 17, the post-processing device PD reverses at least one of the conveyance rollers 9, 10 and the staple discharge roller 11 to reverse the sheet. It can be reversed along the turn guide 8.

  As a result, the post-processing apparatus PD can guide the sheet from the trailing end of the sheet to the sheet storage portion E to stay (prestack), and can convey the sheet while overlapping the next sheet. The post-processing device PD can also convey two or more sheets in a superimposed manner by repeating this operation. Note that the prestack sensor 304 is a sensor for setting the reverse feed timing when the sheets are prestacked.

  When the post-processing device PD guides the sheet to the conveyance path D and performs sheet alignment and edge binding, the post-processing device PD guides the sheet to the end-face binding processing tray F by the staple discharge roller 11 and sequentially stacks the sheets on the end-face binding processing tray F. To do.

  In this case, the post-processing device PD performs the alignment in the longitudinal direction (sheet conveying direction) and the sheet thickness direction with the tapping roller 12 for each sheet, and the lateral direction (hereinafter, “direction orthogonal to the sheet conveying direction”) by the jogger fence 53 Alternatively, it is also referred to as “sheet width direction”).

  The post-processing device PD drives the end-face binding stapler S1 as the binding means by a staple signal from the control device in the interval between jobs, that is, from the last sheet of the sheet bundle to the first sheet of the next sheet bundle. I do. The sheet bundle subjected to the binding process is immediately sent to the discharge roller pair 6 by the discharge belt 52 provided with the discharge claw 52a and is discharged to the shift tray 202 set at the receiving position. That is, in the present embodiment, the discharge claw 52a functions as a sheet discharge unit.

  As shown in FIG. 2, the end-face stitching stapler S1 includes a stitcher S1a that strikes staples and a clincher S1b that bends the tips of the staples. Between the stitcher (driver) S1a and the clincher S1b is a space S1c through which the rear end reference fence 51 can pass. Therefore, the end surface binding stapler S1 can move without interference between the end surface binding stapler S1 and the rear end reference fence 51.

  Further, unlike the saddle stitching stapler S2, the end-face stitching stapler S1 includes a stitcher S1a and a clincher S1b that are integrated. The stitcher S1a is a fixed side that does not move in a direction perpendicular to the sheet surface, and the clincher S1b is a moving side that moves in a direction perpendicular to the sheet surface.

  When the end surface binding stapler S1 configured as described above performs the binding operation on the sheet bundle, the clincher S1b moves to the stitcher S1a side in a predetermined binding portion of the sheet bundle stacked on the rear end reference fence 51. By binding the sheet bundle.

  As will be described later with reference to FIGS. 3 and 4, the discharge belt 52 is positioned at the alignment center in the sheet width direction, is stretched between the pulleys 62, and is driven by the discharge belt drive motor 157. Further, as will be described later with reference to FIGS. 3 and 4, a plurality of discharge rollers 56 are arranged symmetrically with respect to the discharge belt 52 on the sheet discharge side of the end-face binding processing tray F, and are arranged with respect to the drive shaft. It is rotatably provided and functions as a driven roller.

  The release claw 52 a is configured such that the home position is detected by the release belt HP sensor 311. The discharge belt HP sensor 311 is turned on / off by a discharge claw 52 a provided on the discharge belt 52. On the outer periphery of the discharge belt 52, two discharge claws 52a are arranged at opposing positions.

  The two discharge claws 52a alternately move and convey the sheet bundle stored in the end face binding processing tray F. Further, the post-processing device PD can align the front end in the transport direction of the sheet bundle accommodated in the end-face binding processing tray F on the back surface of the discharge claw 52a by rotating the discharge belt 52 reversely as necessary. .

  The rear end holding lever 110 is positioned at the lower end of the rear end reference fence 51 so that the rear end of the sheet bundle accommodated in the rear end reference fence 51 can be pressed from the sheet surface. Reciprocates in a direction substantially perpendicular to the direction. Sheets discharged to the end-face binding processing tray F are struck for each sheet and aligned in the vertical direction (sheet conveyance direction) with a roller 12.

  By the way, if the trailing edge of the sheets stacked on the end surface binding processing tray F is curled or the stiffness of the sheet is weak, the trailing edge tends to buckle and swell due to the weight of the sheet itself. Further, as the number of sheets stacked increases, the gap for the next sheet in the rear end reference fence 51 is reduced, and the vertical alignment tends to be deteriorated. Therefore, the trailing edge pressing mechanism 110 reduces the swelling of the trailing edge of the sheet so that the sheet can easily enter the trailing edge reference fence 51, and the trailing edge pressing lever 110 directly presses the sheet.

  Each of the sheet detection sensors 302, 303, 304, 305, and 310 is a sensor that detects whether or not a sheet has passed at a provided position or whether or not a sheet is stacked.

  Next, the configuration of the end face binding processing tray F according to the present embodiment will be described with reference to FIGS. FIG. 3 is a front view showing the end surface binding processing tray F according to the present embodiment from the sheet stacking surface. 4 and 5 are perspective views showing the end face binding processing tray F according to the present embodiment from the sheet stacking surface. FIG. 6 is a cross-sectional view showing the end face binding processing tray F according to the present embodiment from the main scanning direction.

  The alignment in the width direction of the sheet received from the image forming apparatus PR on the upstream side is performed by the jogger fences 53a and 53b, and the alignment in the sheet conveying direction is abutted against the first and second rear end reference fences 51a and 51b. To be implemented.

  The first and second rear end reference fences 51a and 51b are respectively provided with stack surfaces 51a1, 51a2, 51b1, and 51b2 that hold the sheet bundle in contact with the rear end of the sheet so as to support the rear end of the sheet. It has become. This support is possible at four points, as can be seen from FIG.

  In this manner, the sheet bundle is stacked in contact with any two of the stack surfaces 51a1, 51a2, 51b1, 51b2 of the rear end reference fence 51. This is because the mechanical error including the mounting accuracy of the rear end reference fences 51a and 51b is taken into consideration, and it is possible to support the sheet bundle in a stable state by supporting the sheet bundle at two points. is there.

  Then, in the case of one-point oblique binding, the end surface binding stapler S1 moves to the end portion of the stacked sheet bundle and performs the binding process in a state of being inclined obliquely with respect to the sheet bundle.

  After completion of the alignment operation, the post-processing device PD performs binding processing with the end-face binding stapler S1, and drives the discharge belt 52 counterclockwise by the discharge belt drive motor 157 as can be seen from FIG.

  Then, the post-processing device PD discharges the sheet bundle after the binding processing from the end-face binding processing tray F by scooping it with the discharge claw 52a attached to the discharge belt 52. The side plate 64a and the side plate 64b are side plates for indicating the end face binding processing tray F, respectively.

  Note that the post-processing device PD can perform the same operation as described above even in an unbound bundle in which the binding process is not performed after the alignment process.

  As shown in FIGS. 5 and 6, the sheets guided to the end surface binding processing tray F by the staple paper discharge roller 11 are sequentially stacked on the end surface binding processing tray F. At this time, when the number of sheets discharged to the end face binding processing tray F is one sheet, the sheet is aligned in the vertical direction (sheet conveying direction) with the tapping roller 12 for each sheet, and the jogger fences 53a and 53b perform the width direction ( Alignment in the sheet width direction perpendicular to the sheet conveyance direction is performed.

  The hitting roller 12 is given a pendulum motion by the hitting SOL 170 about the fulcrum 12a, and intermittently acts on the sheet fed to the end surface binding processing tray F, and abuts the rear end of the sheet against the rear end reference fence 51. The hitting roller 12 itself rotates counterclockwise.

  As shown in FIGS. 3 and 5, the jogger fence 53 is provided in a pair (53a, 53b) in the sheet width direction and is driven via a timing belt by a jogger motor 158 capable of forward and reverse rotation, and reciprocates in the sheet width direction. Moving.

  Next, the moving mechanism of the end surface binding stapler S1 according to the present embodiment will be described with reference to FIG. FIG. 7 is a side view showing the stapler S1 according to this embodiment from the sub-scanning direction.

  As shown in FIG. 7, the end surface binding stapler S1 is driven via a timing belt 159a by a stapler moving motor 159 capable of forward and reverse rotation, and moves in the sheet width direction in order to bind a predetermined position of the sheet rear end. A stapler movement HP sensor 312 that detects the home position of the end-face stitching stapler S1 is provided at one end of the movement range.

  The binding position in the sheet width direction is controlled by the amount of movement of the end surface binding stapler S1 from the home position. The end-face binding stapler S1 is configured to be able to bind at one or a plurality of positions (generally two places) at the rear end portion of the sheet, and moves at least over the entire width of the rear end of the sheet supported by the rear end reference fences 51a and 51b. It is configured as possible.

  Further, it is possible to move the apparatus toward the apparatus end as much as possible for exchanging the staple needles, thereby facilitating the user's staple staple exchange operation.

  Next, a mechanism for moving the shift tray 202 in the main scanning direction according to the present embodiment will be described with reference to FIGS. 8A and 8B are perspective views of a moving mechanism of the shift tray 202 according to this embodiment.

  As shown in FIGS. 8A and 8B, in the movement mechanism of the shift tray 202 in the main scanning direction according to the present embodiment, the shift tray 202 can be moved in the main scanning direction. It is supported from the direction of gravity by the support plate 204. In addition, the end fence 32 is fixed to the shift tray 202.

  As shown in FIGS. 8A and 8B, in order to move the shift tray 202 in the main scanning direction, the post-processing device PD first drives a tray shift motor 169 that can rotate forward and backward. The power cam 31 is rotated in the direction of the arrow shown in FIGS. As a result, the driving force of the tray shift motor 169 is transmitted to the end fence 32 via the power cam 31.

  When the driving force of the tray shift motor 169 is transmitted, the end fence 32 moves in the arrow direction shown in FIGS. 8A and 8B, that is, in the main scanning direction. The shift tray 202 moves in the main scanning direction by moving along the tray support plate 204 as the end fence 32 moves.

  The power cam 31 is provided with two notches, and the post-processing device PD detects the position of the notches with the sensor 336, thereby determining the position of the shift tray 202 in the main scanning direction. It can be detected.

  Next, the lifting mechanism of the shift tray 202 according to the present embodiment will be described with reference to FIG. FIG. 9 is a perspective view of the lifting mechanism of the shift tray 202 according to this embodiment.

  As shown in FIG. 9, in the lifting mechanism of the shift tray 202 according to this embodiment, a timing belt 103 is tensioned between a drive shaft 106 and a driven shaft 102 via a timing pulley. A tray support plate 204 is fixed to the timing belt 103, and the shift tray 202 is suspended by the timing belt 103 so as to be lifted and lowered.

  As shown in FIG. 9, in order to raise and lower the shift tray 202, the post-processing device PD first drives the tray lifting / lowering motor 105 that can rotate forward and backward to move the rotating gear 109 via the worm gear 107. The drive shaft 106 is rotated in the same direction by rotating in the arrow direction shown in FIG. As a result, the driving force is transmitted to the timing belt 103 to the tray lifting / lowering motor 105. That is, in this embodiment, the tray lifting / lowering motor 105 and the tray shift motor 169 function as a drive unit.

  When the driving force of the tray lifting / lowering motor 105 is transmitted, the timing belt 103 moves in the direction of the arrow shown in FIG. 9, that is, in the vertical direction, and the shift tray 202 moves along with the movement of the timing belt 103. The tray support plate 204 moves up and down as it moves.

  Thus, since the post-processing device PD moves the shift tray 202 up and down by the tray lifting / lowering motor 105 via the worm gear 107, the shift tray 202 can be held at a fixed position, and the shift tray 202 is prevented from falling. It is possible to do.

  The tray support plate 204 is integrally formed with a shielding plate 108, and sensors 110, 111, 112, 113 for detecting the position of the tray support plate 204 are arranged along the timing belt. Yes. The post-processing device PD can detect the position of the shift tray in the ascending / descending direction by detecting the shielding plate 108 with the sensors 110, 111, 112, and 113.

  Next, the hardware configuration of the post-processing device PD according to the present embodiment will be described with reference to FIG. FIG. 10 is a block diagram schematically showing a hardware configuration of the post-processing device PD according to the present embodiment. In FIG. 10, the hardware configuration of the post-processing apparatus PD will be described as an example, but the same applies to the image forming apparatus PR.

  As illustrated in FIG. 10, a post-processing device PD according to the present embodiment includes a CPU (Central Processing Unit) 701, a RAM (Random Access Memory) 702, a ROM (Read Only Memory) 703, an HDD (Hard Disk Drive) 1704, and the like. A dedicated device 705, an operation unit 706, a display unit 707, and a communication I / F 708 are connected via a bus 709.

  The CPU 701 is a calculation unit and controls the operation of the entire post-processing device PD. The RAM 702 is a volatile storage medium capable of reading and writing information at high speed, and is used as a work area when the CPU 701 processes information. The ROM 703 is a read-only nonvolatile storage medium and stores a program such as firmware.

  The HDD 704 is a non-volatile storage medium that can read and write information, and stores various data such as image data, various programs such as an OS (Operating System), various control programs, and application programs.

  The dedicated device 705 is hardware for realizing a dedicated function in the post-processing device PD, that is, hardware for realizing a dedicated function in folding processing, bookbinding processing, binding processing, and the like. In the image forming apparatus PR, the dedicated device 705 is hardware for realizing a dedicated function in the image forming apparatus PR, that is, hardware for realizing a dedicated function in a printer, a facsimile, a scanner, and a copying machine. Wear.

  The operation unit 706 is a user interface for inputting information to the post-processing device PD, and is realized by an input device such as a keyboard, a mouse, or a touch panel.

  The display unit 707 is a visual user interface for the user to check the state of the post-processing device PD, and is realized by a display device such as an LCD (Liquid Crystal Display).

  The I / F 708 is an interface for the post-processing device PD to communicate with other devices, and interfaces such as Ethernet (registered trademark), USB (Universal Serial Bus) interface, and PCIe (Peripheral Component Interconnect Express) interface are used. .

  In such a hardware configuration, a program stored in a storage medium such as the ROM 703, the HDD 704, or an optical disk is read into the RAM 702, and the CPU 701 performs an operation according to the program loaded in the RAM 702, thereby configuring the software control unit. Is done. A functional block that realizes the function of the post-processing device PD according to the present embodiment is configured by a combination of the software control unit configured as described above and hardware.

  Next, the functional configuration of the post-processing device PD according to the present embodiment will be described with reference to FIG. FIG. 11 is a block diagram schematically illustrating a functional configuration of the post-processing device PD according to the present embodiment.

  As illustrated in FIG. 11, the post-processing device PD according to the present embodiment includes a controller 710, a display panel 720, a communication I / F 730, and a sheet processing engine 740. The controller 710 includes a drive control unit 711, an operation display control unit 712, a communication control unit 713, and a parameter storage unit 714.

  The display panel 720 is an output interface that visually displays the state of the post-processing device PD, and an input when the user directly operates the post-processing device PD or inputs information to the post-processing device PD as a touch panel. It is also an interface. That is, the display panel 720 includes a function of displaying an image for receiving an operation by the user. The display panel 720 is realized by the operation unit 706 and the display unit 707 illustrated in FIG.

  The communication I / F 730 is an interface for the post-processing apparatus PD to communicate with the image forming apparatus PR, and an interface such as a USB or PCIe interface is used. The communication I / F 730 is realized by the I / F 708 shown in FIG. The post-processing apparatus PD according to the present embodiment sends various parameters necessary for control such as operation information, sheet bundle stacking status, sheet information, and sheet conveyance timing from the image forming apparatus PR via the communication I / 730. It will come.

  The sheet processing engine 740 performs sheet processing on the image-formed sheet conveyed from the image forming apparatus PR. The sheet processing engine 740 is realized by a dedicated device 705 shown in FIG.

  The controller 710 is configured by a combination of software and hardware. Specifically, a software control unit and an integrated circuit configured by loading a control program such as firmware stored in a non-volatile storage medium such as the ROM 703 or the HDD 704 into the RAM 702 and the CPU 701 performs an operation according to the program. The controller 710 is configured by hardware such as the above.

  The drive control unit 711 plays a role of controlling each unit included in the controller 710 and gives a command to each unit of the controller 710. The drive control unit 711 also controls the communication control unit 713 to acquire various parameters necessary for control, such as operation information, sheet information, and sheet conveyance timing, from the image forming apparatus PR via the communication I / F 730. The drive control unit 711 controls or drives the sheet processing engine 740.

  The operation display control unit 712 displays information on the display panel 720 or notifies the drive control unit 711 of information input via the display panel 720. The communication control unit 713 inputs a signal or a command input via the communication I / F 730 to the drive control unit 711.

  The parameter storage unit 714 stores parameters input by a user operation on the display panel 720 and various parameters sent from the image forming apparatus PR.

  Next, the drive profile and shift of the tray shift motor 169 or the tray lifting / lowering motor 105 (hereinafter collectively referred to as “tray motor”) when the conventional post-processing device moves or lifts the shift tray 202 in the main scanning direction. The speed fluctuation of the tray 202 will be described with reference to FIGS. 12 (a) and 12 (b).

  FIG. 12A is a diagram showing a drive profile of the tray motor when the conventional post-processing apparatus moves the shift tray 202 in the main scanning direction or lifts and lowers it. FIG. 12B is a diagram showing the speed fluctuation of the shift tray 202 when the conventional post-processing apparatus moves or lifts the shift tray 202 in the main scanning direction.

  When the shift tray 202 is moved or moved up and down in the main scanning direction, the conventional post-processing device controls the tray motor to be driven according to a drive profile as shown in FIG.

  However, at this time, as shown in FIG. 12B, the shift tray 202 has a speed fluctuation at the end of rising and stopping of the tray motor, that is, at the end of acceleration, and generates a periodic natural vibration. This is because if the mass of the shift tray 202 is M, a force F = Ma acts on the shift tray 202 in the moving direction during acceleration.

  Due to this force, the shift tray 202 generates periodic natural vibrations at the end of rising and at the stop, that is, at the end of acceleration. Due to the occurrence of this periodic natural vibration, the conventional post-processing apparatus generates noise when the shift tray 202 is moved in the main scanning direction or when it is moved up and down.

  In addition, if the conventional post-processing apparatus performs sheet processing while the shift tray 202 is moving or moving up and down, the sheet processing accuracy deteriorates. Therefore, the processing of the next sheet is started until the vibration is reduced. There is a need to wait and productivity is reduced. In addition, due to the generation of this periodic natural vibration, various problems may occur in the conventional post-processing apparatus due to vibration generated when the shift tray 202 is moved or lifted.

  Therefore, the post-processing device PD according to the present embodiment creates a drive profile for suppressing the natural vibration of the shift tray 202 when the shift tray 202 is moved or lifted, and follows the created drive profile. Control to drive the tray motor.

  Here, FIG. 13A to FIG. 13C illustrate a procedure for creating a drive profile of the tray motor for suppressing the natural vibration of the shift tray when the post-processing device PD according to the present embodiment moves the shift tray 202. This will be described with reference to FIG. 13 (d) and FIG. In the present embodiment, it is assumed that the drive control unit 711 creates a drive profile. That is, in the present embodiment, the drive control unit 711 functions as a drive mode determination unit.

  FIG. 13A to FIG. 13D are diagrams for explaining a procedure in which the post-processing device PD according to the present embodiment creates a tray motor drive profile. FIG. 14 is a flowchart for explaining a procedure by which the post-processing apparatus according to the present embodiment creates a tray motor drive profile.

  As shown in FIGS. 13A to 13D and FIG. 14, the post-processing device PD according to the present embodiment inputs the shift tray 202 in two stages in order to suppress the natural vibration of the shift tray 202. Is given in two stages, thereby creating a drive profile that cancels out the natural vibration that occurs at the input of the first stage with the natural vibration that occurs at the input of the second stage. Then, the post-processing device PD according to the present embodiment drives the tray motor according to the drive profile created in this way.

  As shown in FIG. 13A, when the post-processing device PD according to the present embodiment performs input so that the target value of the moving speed is A and drives the tray motor, as described above, the shift tray Natural vibration occurs in 202.

Under such a premise, in order to suppress the natural vibration of the shift tray 202, the post-processing device PD according to the present embodiment first has an overshoot of the moving speed as the target value as shown in FIG. An input (hereinafter referred to as “first input” or “first acceleration”) is set to be A (S1401). As described above, when the tray motor is driven by the first input, the natural vibration is generated in the shift tray 202 in the same manner. At this time, the moving speed is assumed to converge to A _1.

Further, as shown in FIG. 13C, the post-processing device PD according to the present embodiment inputs (hereinafter referred to as “second input” or “second input”) so that the moving speed converges to A−A ₁ = A ₂ . 2) "is set (S1402). As described above, when the tray motor is driven by the second input, the natural vibration is generated in the shift tray 202 in the same manner.

  At this time, the frequency of the natural vibration generated by the first input and the frequency of the natural vibration generated by the second input are the same. A half cycle of the natural vibration frequency at this time is represented by ΔT.

  Then, as shown in FIG. 13D, the post-processing device PD according to the present embodiment shifts the time by ΔT from the acceleration start time by the first input, and combines the second input with the first input. Set. In other words, the post-processing device PD according to the present embodiment sets the input so that the natural vibration that is the opposite phase of the natural vibration generated by the first input is generated by the second input (S1403).

  As another method, a procedure for creating a tray motor drive profile for suppressing the natural vibration of the shift tray 202 when the post-processing apparatus PD according to the present embodiment moves the shift tray 202 is shown in FIG. This will be described with reference to FIGS. 15 (a) to 15 (d) and FIG.

  FIG. 15A to FIG. 15D are diagrams for explaining a procedure in which the post-processing device PD according to the present embodiment creates a tray motor drive profile. FIG. 16 is a flowchart for explaining a procedure in which the post-processing device PD according to the present embodiment creates a drive profile for the tray motor.

  As shown in FIGS. 15A to 15D and FIG. 16, the post-processing device PD according to the present embodiment applies acceleration to the shift tray 202 in two stages in order to suppress the natural vibration of the shift tray 202. Thus, a drive profile is created so that the natural vibration that occurs during the first stage of acceleration cancels out with the natural vibration that occurs during the second stage of acceleration. Then, the post-processing device PD according to the present embodiment drives the tray motor according to the drive profile created in this way.

  That is, as shown in FIG. 15A, the post-processing device PD according to the present embodiment first sets the first stage acceleration at the start of acceleration of the shift tray 202 when creating the drive profile of the tray motor. It is set so as to be given to the shift tray 202 for a time T as one input (first acceleration) (S1601). The magnitude of acceleration at this time is 1. FIG. 17A shows the speed fluctuation of the shift tray 202 at this stage.

  Then, as shown in FIG. 15B, the post-processing device PD according to the present embodiment is equivalent to a half cycle (ΔT) of the frequency of the natural vibration generated by the first input from the acceleration start time by the first input. The time is shifted and the second stage acceleration is set as a second input (second acceleration) so as to be given to the shift tray 202 for the time T (S1602). The magnitude of acceleration at this time is K. The speed fluctuation of the shift tray 202 at this stage is shown in FIG.

  Thereafter, as shown in FIG. 15C, the post-processing device PD according to the present embodiment combines the acceleration by the first input and the acceleration by the second input set as described above (S1603). At this time, since the acceleration by the first input and the acceleration by the second input are simply combined, as shown in FIG. 15C, the speed at the end of the acceleration is the original speed ( 1 + K) is multiplied.

  Therefore, as shown in FIG. 15D, the post-processing device PD according to the present embodiment uses the first input acceleration and the second input acceleration to match the speed at the end of acceleration to the original speed. The synthesized acceleration is multiplied by 1 / (1 + K) (S1604). Thereby, the speed at the end of acceleration becomes the same speed as the original speed. FIG. 17C shows the speed variation of the shift tray at this stage.

  Note that the post-processing device PD according to the present embodiment can completely suppress the natural vibration of the shift tray 202 if K = 1 when the natural vibration of the shift tray 202 is not attenuated with time. However, in actuality, the natural vibration of the shift tray 202 attenuates with time.

Therefore, ΔT and K are defined by the following equations in order to take into account the attenuation of the shift tray 202 over time. In the following equation, ω _n is the natural vibration frequency of the shift tray 202, and ζ is the natural vibration damping coefficient of the shift tray 202.

  Here, FIG. 18 shows a positional deviation when the post-processing device PD according to the present embodiment drives the tray motor by the drive profile created by the procedure described with reference to FIGS. FIG. 18 is a diagram showing a positional deviation when the tray motor is driven by the drive profile created by the post-processing device PD according to the present embodiment.

  As shown in FIG. 18, the post-processing device PD according to the present embodiment gives the second input by shifting the time by the half cycle (ΔT) of the natural vibration frequency from the acceleration start time by the first input, A natural vibration having a phase opposite to that of the natural vibration generated by the first input is generated by the second input.

  That is, the post-processing device PD according to the present embodiment gives the second input by shifting the time by the half period (ΔT) of the natural vibration frequency from the acceleration start time by the first input, thereby giving the second input. The natural vibrations generated by the two inputs cancel each other. Thereby, the post-processing device PD according to the present embodiment can suppress the natural vibration of the shift tray 202.

  In FIGS. 13 to 18, the rise time of the tray motor has been described, but the same applies to the fall time. Hereinafter, the method of suppressing the natural vibration of the shift tray 202 according to the procedure described with reference to FIGS. 13 and 14 is referred to as “positive casting method”, and the shift tray 202 is configured according to the procedure described with reference to FIGS. A method for suppressing the natural vibration is referred to as a “pre-shape method”.

  However, the frequency cycle of the natural vibration of the shift tray 202 is the number of sheet bundles stacked on the shift tray 202, the loaded weight, the center of gravity in the main scanning direction, the center of gravity in the sub-scanning direction, and the like. It changes as shown in FIG. 19 depending on the loading situation. In FIG. 19, the half cycle of the natural vibration frequency before the change is ΔT, and the half cycle of the natural vibration frequency after the change is ΔT + T ′.

  In such a case, the post-processing device PD according to the present embodiment gives the second input by shifting the time by ΔT from the start of acceleration by the first input. The phase is not reversed. Therefore, in such a case, as shown in FIG. 19, the post-processing device PD according to the present embodiment cannot cancel out the natural vibration caused by the first input with the natural vibration caused by the second input. Will not be suppressed.

  Therefore, the post-processing device PD according to the present embodiment creates a drive profile according to a change in the frequency of the natural frequency of the shift tray 202, that is, according to the stacking condition of the sheet bundle on the shift tray 202. It is configured.

  Specifically, as illustrated in FIG. 20, the post-processing device PD according to the present embodiment applies a second input to the shift tray 202 by shifting the time by ΔT + T ′ from the acceleration start by the first input. Is configured to create. The post-processing device PD according to the present embodiment is configured in this way, so that even if the frequency period of the natural vibration of the shift tray 202 changes, the natural vibration by the second input is changed to the natural vibration by the first input. The phase can be reversed.

  Accordingly, the post-processing device PD according to the present embodiment can suppress the natural vibration of the shift tray 202 even if the period of the natural vibration frequency changes due to the change of the stacking condition of the sheet bundle on the shift tray 202. It becomes possible.

  Next, an example of a stacking state of the sheet bundle on the shift tray 202 of the post-processing device PD according to the present embodiment will be described with reference to FIGS. FIGS. 21A to 21C are views for explaining the stacking status of the sheet bundles stacked on the shift tray 202 in the post-processing apparatus PD according to this embodiment.

  As shown in FIGS. 21A and 21B, the frequency cycle of the natural vibration of the shift tray 202 differs between the case where the sheet bundle is not stacked on the shift tray 202 and the case where the sheet bundle is stacked. Further, as shown in FIGS. 21B and 21C, even when the number of sheets and the weight of the sheet bundle stacked on the shift tray 202 are different, the frequency cycle of the natural vibration of the shift tray 202 is different.

  Therefore, the post-processing device PD according to the present embodiment has a drive profile according to the number of sheets and the weight of the sheet bundle stacked on the shift tray 202, that is, according to the period change of the natural vibration frequency of the shift tray 202. The shift tray 202 is created and moved or moved up and down according to the drive profile.

  Therefore, the post-processing device PD according to the present embodiment has the natural vibration of the shift tray 202 even if the frequency period of the natural vibration changes due to the change in the number of sheets and the weight of the sheet bundle stacked on the shift tray 202. Can be suppressed.

  Note that the post-processing device PD according to the present embodiment measures and stores the frequency of the natural vibration frequency of the shift tray 202 for each sheet number and weight of the sheet bundle stacked on the shift tray 202.

  Further, the post-processing device PD according to the present embodiment measures the number of stacked sheets stacked on the shift tray 202 or detects the height of the sheet bundle stacked on the shift tray 202 by a sensor, By converting the height into the number of stacked sheets, the number of stacked sheets is obtained.

  In addition, the post-processing device PD according to the present embodiment converts the number of stacked sheets into weight based on sheet information such as sheet thickness, size, density, and material, and thereby stacks sheets stacked on the shift tray 202. Get the loading weight of.

  Alternatively, the post-processing device PD according to the present embodiment includes a sensor such as a load cell in the shift tray 202, and detects the stacking weight of the sheet bundle stacked on the shift tray 202 by the sensor. In addition, the post-processing device PD according to the present embodiment can also estimate the stacking weight of the sheet bundle stacked on the shift tray 202 from driving information such as a tray motor driving current and a rotation speed.

  Then, the post-processing device PD according to the present embodiment creates a drive profile based on the number of stacked sheets obtained in this way or the period associated with the loaded weight.

  Next, another example of the stacking condition of the sheet bundle on the shift tray 202 of the post-processing apparatus PD according to the present embodiment will be described with reference to FIGS. 22 (a) and 22 (b). FIGS. 22A and 22B are views for explaining a stacking state of sheet bundles on the shift tray 202 of the post-processing apparatus PD according to the present embodiment.

  As shown in FIGS. 22A and 22B, the center of gravity may differ depending on the thickness and size of the sheets even if the stack weight of the sheet bundles stacked on the shift tray 202 is the same. When the center of gravity of the sheet bundle loaded on the shift tray 202 changes, the frequency cycle of the natural vibration of the shift tray 202 changes. In FIGS. 22A and 22B, the centers of gravity of the sheet bundle P1 are CG1 and CG2, respectively.

  In general, the natural frequency of the shift tray 202 tends to decrease as the center of gravity of the sheet bundle loaded on the shift tray 202 moves away from the main body of the post-processing apparatus PD.

  Therefore, the post-processing device PD according to the present embodiment creates a drive profile according to the center of gravity of the sheet bundle stacked on the shift tray 202, that is, according to the period change of the natural vibration frequency of the shift tray 202, The shift tray 202 is configured to move or move up and down according to the drive profile.

  Therefore, the post-processing device PD according to the present embodiment suppresses the natural vibration of the shift tray 202 even if the frequency cycle of the natural vibration changes due to the change of the center of gravity of the sheet bundle loaded on the shift tray 202. It becomes possible.

  The post-processing device PD according to the present embodiment measures and stores the frequency of the natural vibration frequency of the shift tray 202 for each barycentric position of the sheet bundle loaded on the shift tray 202. Further, the post-processing apparatus PD according to the present embodiment calculates the position of the center of gravity based on the sheet information of the sheet bundle stacked on the shift tray 202 and the weight thereof. Then, the post-processing device PD according to the present embodiment creates a drive profile based on the period associated with the barycentric position obtained in this way.

  As described above, the post-processing apparatus PD according to the present embodiment creates a drive profile according to the stacking condition of the sheet bundle on the shift tray 202, that is, according to the period of the natural vibration frequency of the shift tray 202. One of the gist is to do. Therefore, the post-processing device PD according to the present embodiment suppresses the natural vibration of the shift tray 202 even if the period of the natural vibration frequency changes due to the change of the stacking condition of the sheet bundle in the shift tray 202. Is possible.

  In the present embodiment, the post-processing device PD configured to create a drive profile according to the frequency cycle of the natural vibration of the shift tray 202 has been described. In addition, the post-processing device PD according to the present embodiment, as shown in FIG. 23A, when the shift of the natural frequency of the shift tray 202 is within a predetermined range, It may be configured not to perform control such as creating a drive profile in accordance with the frequency cycle of the natural vibration.

  This is because, in such a case, the post-processing device PD according to the present embodiment, as shown in FIG. 23B, is unique to the shift tray 202 even in the normal drive profile described with reference to FIGS. This is because vibration can be sufficiently suppressed. 23A and 23B show the case where the predetermined range is ± ΔT / 4.

  Therefore, when the post-processing device PD according to the present embodiment is configured as described above, it is possible to reduce the control load for suppressing the natural vibration of the shift tray 202.

  Further, in the present embodiment, the post-processing device PD that creates a drive profile including two stages of acceleration has been described. In addition, as shown in FIG. 24, the post-processing device PD according to the present embodiment uses a notch filter centered on the frequency component of the natural frequency and reduced in the control amount and the control gain. A similar effect can be obtained by creating a drive profile that does not affect the frequency component. Therefore, the post-processing device PD according to the present embodiment may re-create the drive profile by shifting the center frequency of the notch filter for the deviation of the natural frequency due to the stacking condition of the sheet bundle on the shift tray 202.

  Further, in the present embodiment, the post-processing device PD that controls to suppress the natural vibration of the shift tray 202 according to the stacking condition of the sheet bundle on the shift tray 202 has been described. In addition, the post-processing device PD according to the present embodiment may be controlled so as to suppress the natural vibration of the discharge claw 52a according to the stacking condition of the sheet bundle in the end-face binding processing tray F. That is, the post-processing device PD according to the present embodiment may be configured to create a drive profile of the discharge belt drive motor 157 according to the stacking condition of the sheet bundle in the end-face binding processing tray F.

  When the post-processing apparatus PD according to the present embodiment is configured as described above, even if the frequency of the natural vibration of the discharge claw 52a changes due to the change of the stacking condition of the sheet bundle in the end-face binding processing tray F, The natural vibration can be suppressed. This is because the frequency cycle of the natural vibration of the discharge claw 52a changes in accordance with the stacking condition of the sheet bundle in the end face binding processing tray F, similarly to the shift tray 202.

  Further, in the present embodiment, the post-processing device PD that controls to suppress the natural vibration of the shift tray 202 according to the stacking condition of the sheet bundle on the shift tray 202 has been described. In addition, the post-processing device PD according to the present embodiment suppresses the natural vibration of the shift tray 202 according to vibration information such as the frequency, period, and amplitude of the natural vibration expected from the stacking condition of the sheet bundle in the shift tray 202. You may be comprised so that it may control.

  In the present embodiment, the drive profile is created so as to give the second input by shifting the time by the half period (ΔT) of the natural vibration frequency from the acceleration start time by the first input. The post-processing device PD has been described. In addition, the post-processing device PD according to the present embodiment has an n. The drive profile may be created so as to give the second input by shifting the time by 5 cycles (ΔT × n.5). Here, n is an integer of 0 or more.

  In the present embodiment, the post-processing device PD that can move the shift tray 202 in the main scanning direction or move it up and down has been described. In addition, the post-processing device PD according to the present embodiment may be configured to move the shift tray 202 in the sub-scanning direction, the horizontal direction, and other directions.

  In the present embodiment, the image forming system provided with the post-processing apparatus PD includes a moving mechanism that moves the shift tray 202 and an elevating mechanism that moves the shift tray 202 up and down. In addition, the image forming system according to the present embodiment also includes such a moving mechanism and a lifting mechanism in the image forming apparatus PR, the document reading device PA, and the sheet feeding device PB. It is possible to apply drive control similar to the drive control described in the present embodiment.

Embodiment 2. FIG.
First, when the post-processing device PD according to the present embodiment moves the discharge claw 52a in order to discharge the sheet bundle loaded on the end face binding processing tray F, the drive profile of the discharge belt drive motor 157 and the discharge claw 52a The speed fluctuation will be described with reference to FIGS. 25 (a) and 25 (b).

  FIG. 25A is a diagram showing a drive profile of the discharge belt drive motor 157 when the post-processing device PD according to the present embodiment moves the discharge claw 52a during the sheet bundle discharge operation. FIG. 25B is a diagram illustrating a speed variation of the discharge claw 52a when the post-processing device PD according to the present embodiment moves the discharge claw 52a during the sheet bundle discharge operation.

  The post-processing device PD according to the present embodiment is controlled to drive the discharge belt drive motor 157 according to the drive profile as shown in FIG. 25A when moving the discharge claw 52a during the sheet bundle discharge operation. To do.

  That is, in the sheet bundle discharging operation, the post-processing apparatus PD according to the present embodiment drives the discharge belt driving motor 157 at a low speed until the discharge claw 52a contacts the sheet bundle, lifts the sheet bundle, and contacts the sheet bundle. Accelerate to normal speed later.

  Here, as shown in FIG. 25A, the post-processing device PD according to the present embodiment lifts the sheet bundle at a low speed, not the normal speed, and then accelerates to the normal speed after that. Will be described.

  In the post-processing device PD according to the present embodiment, when the discharge belt drive motor 157 is driven at a normal speed, the discharge claw 52a comes into contact with the sheet bundle at a high speed. Vibration occurs in the claw 52a. In the post-processing device PD according to the present embodiment, when vibration is generated in the discharge claw 52a, dirt is attached to the edge of the sheet bundle or is damaged.

  Further, in the post-processing device PD according to the present embodiment, when the discharge belt drive motor 157 is a DC motor, when the discharge claw 52a is vibrated, the pulsation of the current is generated to increase the execution current. Further, when the discharge belt drive motor 157 is a stepping motor, the post-processing device PD according to the present embodiment needs to have a large current set value in order to prevent step-out due to load fluctuation when vibration occurs in the discharge claw 52a. As a result, power consumption increases.

  As described above, in the post-processing device PD according to the present embodiment, when the discharge belt driving motor 157 is driven at the normal speed from the beginning during the sheet bundle discharging operation, various problems occur. Therefore, as shown in FIG. 25A, the post-processing device PD according to the present embodiment does not drive the discharge belt drive motor 157 from the beginning at the normal speed at the time of the sheet bundle discharging operation, but at low speed first. Control is performed according to a drive profile that lifts the sheet bundle and then accelerates to normal speed.

  However, as shown in FIG. 25B, the post-processing device PD according to the present embodiment suppresses vibrations to some extent even if the discharge belt drive motor 157 lifts the sheet bundle at a low speed instead of the normal speed. Vibrations occur if possible.

  Therefore, the post-processing device PD according to the present embodiment creates a drive profile that decelerates the discharge belt drive motor 157 immediately before the discharge claw 52a contacts the sheet bundle, and sets the discharge belt drive motor 157 according to the drive profile. It is comprised so that it may drive.

  Therefore, the post-processing device PD according to the present embodiment can suppress vibration generated in the discharge claw 52a during the sheet bundle discharge operation. Therefore, the post-processing device PD according to the present embodiment can prevent the edge of the sheet bundle from becoming dirty or scratched.

  Further, when the discharge belt drive motor 157 is a DC motor, the post-processing device PD according to the present embodiment can suppress the occurrence of current pulsation by suppressing the vibration generated in the discharge claw 52a. Thus, the execution current can be reduced.

  In addition, when the discharge belt drive motor 157 is a stepping motor, the post-processing device PD according to the present embodiment suppresses vibration generated in the discharge claw 52a, thereby preventing a step-out due to load fluctuations. Therefore, it is possible to reduce power consumption.

  As described above, the post-processing apparatus PD according to the present embodiment can eliminate various problems caused by the vibration by suppressing the vibration generated in the discharge claw 52a during the sheet bundle discharging operation. Become.

  Note that the timing at which the discharge belt drive motor 157 is decelerated and the deceleration amount of the discharge belt drive motor 157 are determined according to the stacking condition of the sheet bundle on the end face binding processing tray F and the vibration information expected from the stacking condition. .

  Next, FIG. 26A shows a drive profile for suppressing the vibration of the discharge claw 52a that is generated when the post-processing apparatus PD according to the present embodiment discharges a sheet bundle stacked on the end face binding processing tray F. ) To (c) and FIGS. 27 (a) to (d). FIGS. 26A to 26C and FIGS. 27A to 27D show drive profiles for suppressing the vibration of the discharge claw 52a generated when the post-processing apparatus PD according to the present embodiment contacts the sheet bundle. It is a figure for demonstrating.

  FIGS. 26A to 26C show drive profiles created using the positive cast method, and FIGS. 27A to 27D show the drive profile created using the pre-shape method. Drive profile is shown.

  As shown in FIGS. 26A and 27A, the post-processing apparatus PD according to the present embodiment first drives the discharge belt drive motor 157 at a low speed during the sheet bundle discharging operation.

  As shown in FIGS. 26A and 27A, the post-processing apparatus PD according to the present embodiment uses a positive cast method and a pre-shape method immediately before the discharge claw 52a contacts the sheet bundle. The release belt drive motor 157 is decelerated by the drive profile created in this way.

  Thereafter, as shown in FIGS. 26A and 27A, the post-processing device PD according to the present embodiment sets the discharge belt drive motor 157 to the original low speed after the discharge claw 52a contacts the sheet bundle. return.

  Further, as shown in FIGS. 26B and 27B, the post-processing apparatus PD according to the present embodiment first drives the discharge belt drive motor 157 at a low speed during the sheet bundle discharging operation.

  Then, as shown in FIGS. 26B and 27B, the post-processing apparatus PD according to the present embodiment uses a positive cast method and a pre-shape method immediately before the discharge claw 52a contacts the sheet bundle. The release belt drive motor 157 is decelerated by the drive profile created in this way.

  Thereafter, as shown in FIGS. 26 (b) and 27 (b), the post-processing device PD according to the present embodiment sets the discharge belt drive motor 157 to the original low speed after the discharge claw 52a contacts the sheet bundle. Instead of returning, it accelerates to normal speed.

  Accordingly, when the post-processing device PD according to the present embodiment drives the discharge belt drive motor 157 with a drive profile as shown in FIGS. 26B and 27B, FIGS. 26A and 27B. Productivity can be improved as compared with the case where the discharge belt drive motor 157 is driven with a drive profile as shown in FIG.

  Further, as shown in FIGS. 26C and 27C, the post-processing device PD according to the present embodiment drives the discharge belt drive motor 157 from the beginning at a normal speed during the sheet bundle discharging operation.

  As shown in FIGS. 26C and 27C, the post-processing device PD according to the present embodiment uses a positive cast method and a pre-shape method immediately before the discharge claw 52a contacts the sheet bundle. The release belt drive motor 157 is decelerated by the drive profile created in this way.

  Thereafter, as shown in FIGS. 26C and 27C, the post-processing device PD according to the present embodiment uses the discharge belt drive motor 157 to the original normal speed after the discharge claw 52a contacts the sheet bundle. Return to.

  Therefore, the post-processing device PD according to the present embodiment, when the discharge belt drive motor 157 is driven with a drive profile as shown in FIGS. 26C and 27C, FIGS. ), The productivity can be improved as compared with the case where the discharge belt drive motor 157 is driven with a drive profile as shown in FIGS.

  As described with reference to FIGS. 26A to 26C and FIGS. 27A to 27C, the post-processing device PD according to the present embodiment is unique to the discharge claw 52a when the sheet bundle is contacted. In order to suppress vibration, the discharge belt drive motor 157 is decelerated immediately before the discharge claw 52a contacts the sheet bundle.

  However, as shown in FIG. 27D, the post-processing device PD according to the present embodiment does not decelerate the discharge belt drive motor 157 immediately before the discharge claw 52a comes into contact with the sheet bundle, and changes from a low speed to a normal speed. It is also possible to suppress the vibration of the discharge claw 52a that occurs when the sheet bundle contacts during the acceleration operation.

  That is, as shown in FIG. 27D, the post-processing device PD according to the present embodiment first drives the discharge belt drive motor 157 at a low speed during the sheet bundle discharging operation.

  Then, as shown in FIG. 27D, the post-processing device PD according to the present embodiment shifts from the low speed to the normal speed without decelerating the discharge belt drive motor 157 immediately before the discharge claw 52a contacts the sheet bundle. In the acceleration operation, the vibration of the discharge claw 52a that occurs when the sheet bundle contacts is suppressed.

  Note that the post-processing apparatus PD according to the present embodiment has a positive casting method or a pre-shape in the driving profile as shown in FIGS. 26 and 27 at the time of re-acceleration after the discharge claw 52a contacts the sheet bundle. If the discharge belt drive motor 157 is driven in accordance with a normal drive profile created using the method, vibration of the discharge claw 52a that occurs when the sheet bundle contacts can not be suppressed.

  The reason will be described with reference to FIGS. 28 (a) and 28 (b). FIGS. 28A and 28B are views showing a positional deviation when the discharge belt drive motor 157 is driven by a normal drive profile created by the post-processing device PD according to the present embodiment.

  As shown in FIG. 28A, the post-processing device PD according to the present embodiment generates a natural vibration due to the first input and the second input during the sheet bundle discharging operation, and also includes the discharge claw 52a and the sheet bundle. Natural vibration is generated by contact with.

  Therefore, as shown in FIG. 28B, the post-processing device PD according to the present embodiment has the second input so that the natural vibration generated by the first input and the natural vibration generated by the second input cancel each other. However, even if the natural vibration generated by the first input can be suppressed, the natural vibration at the time of sheet bundle contact cannot be suppressed. Therefore, when the post-processing device PD according to the present embodiment releases the sheet bundle, the natural vibration at the time of contacting the sheet bundle remains.

  Therefore, the post-processing device PD according to the present embodiment takes into account not only the natural vibration generated by the first input but also the natural vibration generated in the discharge claw 52a when the sheet bundle is contacted, so as to cancel them. It is configured to create a drive profile that provides input.

  That is, as shown in FIG. 29A, the post-processing apparatus PD according to the present embodiment is configured to cancel out the natural vibration generated by the first input and the natural vibration generated in the discharge claw 52a when the sheet bundle contacts. It is configured to create a drive profile that gives two inputs. The post-processing device PD according to the present embodiment is configured to drive the discharge belt drive motor 157 according to the drive profile created in this way.

  As a result, as shown in FIG. 29B, the post-processing device PD according to the present embodiment can suppress not only the natural vibration generated by the first input but also the natural vibration at the time of sheet bundle contact. Become. As a result, the post-processing device PD according to the present embodiment can suppress vibration of the discharge claw 52a that occurs when the sheet bundle contacts, even during re-acceleration after the discharge claw 52a contacts the sheet bundle. Become.

  However, the post-processing device PD according to the present embodiment needs to match the generation timing of the natural vibration by the first input with the generation timing of the natural vibration when the sheet bundle is contacted. Further, in the post-processing device PD according to the present embodiment, the re-acceleration timing after the discharge claw 52a comes into contact with the sheet bundle is predicted from the stacking condition of the sheet bundle in the end face binding processing tray F and the stacking condition. Determine according to vibration information.

  As described above, the post-processing device PD according to the present embodiment cancels the natural vibration generated by the first input and the natural vibration at the time of sheet bundle contact with the natural vibration generated by the second input. An example configured to create the will be described. However, in addition to this, the post-processing device PD according to the present embodiment creates a drive profile so that the natural vibration generated by the first input is canceled by the natural vibration generated when the sheet bundle is in contact with the natural vibration generated by the second input. It may be configured to.

  Next, a normal drive profile created by the post-processing apparatus PD according to the present embodiment using the pre-shape method and a drive profile created in consideration of the natural vibration at the time of sheet bundle contact are shown in FIGS. . 30 to 33 are diagrams showing a normal drive profile created by the post-processing apparatus PD according to the present embodiment using the pre-shape method and a drive profile created in consideration of the natural vibration at the time of sheet bundle contact. is there.

  30 to 33, the magnitude of acceleration by the first input and the second input and the acceleration time by the first input and the second input are the sheet bundle stacking status in the end face binding processing tray F and the stacking thereof. It is determined according to the vibration information expected from the situation.

  As shown in FIGS. 30 and 31, the post-processing device PD according to the present embodiment leaves the natural vibration when the sheet bundle is in contact with the normal drive profile. A drive profile is created in which the acceleration due to one input is reduced and the acceleration due to the second input is increased.

  Also, as shown in FIGS. 32 and 33, the post-processing device PD according to the present embodiment leaves the natural vibration at the time of sheet bundle contact if the normal drive profile is maintained. A drive profile is created in which the acceleration by the first input is increased and the acceleration by the second input is decreased.

  30 and 32 show the case where the first input and the second input overlap, and FIGS. 31 and 33 show the case where the first input and the second input do not overlap.

  Next, processing when the post-processing device PD according to the present embodiment performs the discharging operation will be described with reference to FIG. FIG. 34 is a flowchart for explaining a process when the post-processing device PD according to the present embodiment performs the discharging operation.

  As shown in FIG. 34, when the post-processing apparatus PD according to the present embodiment performs the discharge operation, first, the drive control unit 711 sets the operation mode of the discharge belt drive motor 157 to the vibration suppression mode and the non-vibration suppression mode. It is determined which one is set (S3401).

  If the drive control unit 711 determines in the determination process in S3401 that the operation mode of the discharge belt drive motor 157 is set to the vibration suppression mode (S3401 / YES), the drive control unit 711 receives the end face binding processing tray F from the image forming apparatus PR. In step S3402, the stacking state of the sheet bundle or the vibration information predicted from the stacking state is acquired.

  Then, the drive control unit 711 determines whether or not a vibration greater than an allowable value is generated in the discharge claw 52a in the sheet bundle discharge operation based on the stacking state or vibration information acquired in S3402 (S3403).

  When it is determined in the determination process in S3403 that the vibration exceeding the allowable value is generated (S3403 / YES), the drive control unit 711 follows the method described with reference to FIGS. 26, 27, and 29 to 33. A drive profile corresponding to the loading status or vibration information acquired in S3402 is created (S3404).

  On the other hand, when the drive control unit 711 determines in the determination process in S3401 that the operation mode of the discharge belt drive motor 157 is set to the non-vibration suppression mode (S3401 / NO), or in the determination process in S3403 When it is determined that no more vibration than the value is generated (S3403 / NO), a normal drive profile is created.

  Then, the drive control unit 711 drives the discharge belt drive motor 157 according to the drive profile created in S3404 or S3405, thereby discharging the sheet bundle stacked on the end face binding processing tray F (S3406).

  As described above, the post-processing device PD according to the present embodiment has a sheet according to the stacking condition of the sheet bundle or the drive profile based on the vibration information when the operation mode of the discharge belt drive motor 157 is set to the vibration suppression mode. A bundle discharging operation is performed. On the other hand, the post-processing device PD according to the present embodiment is configured to execute the sheet bundle discharging operation with a normal driving profile when the operation mode of the discharge belt driving motor 157 is set to the non-vibration suppression mode. Yes.

  Therefore, the post-processing device PD according to the present embodiment can improve productivity by setting the operation mode of the discharge belt drive motor 157 to the non-vibration suppression mode, while setting to the vibration suppression mode. Thus, it is possible to suppress vibration generated in the discharge claw 52a.

PR image forming apparatus PA document reading apparatus PD post-processing apparatus PB sheet supply apparatus 701 CPU
702 RAM
703 ROM
704 HDD
705 Dedicated device 706 Operation unit 707 Display unit 708 I / F
709 Bus 710 Controller 711 Drive control unit 712 Operation display control unit 713 Communication control unit 714 Parameter storage unit 720 Display panel 730 Communication I / F
740 Sheet processing engine

JP 2012-148846 A

Claims (15)

A sheet stacking unit for stacking conveyed sheets;
A sheet moving section for moving the stacked sheets;
A drive unit for driving the sheet moving unit;
A drive mode determination unit that determines a drive mode of the drive unit according to a sheet stacking state in the sheet stacking unit;
A drive control unit for controlling the drive of the drive unit according to the determined drive mode;
A sheet processing apparatus comprising:   The driving mode determination unit is configured to determine the sheet moving unit according to the stacking condition at the time of acceleration of the driving unit from a first acceleration at the time of starting the acceleration of the driving unit and an acceleration start time of the driving unit by the first acceleration. The combined acceleration obtained by synthesizing the second acceleration with the first acceleration is determined as a driving mode of the driving unit by delaying a time corresponding to a half cycle of the natural vibration generated in the driving unit. Sheet processing equipment.   The drive mode determination unit determines a drive mode of the drive unit using a notch filter that reduces a control amount of a period of natural vibration generated in the sheet moving unit according to the stacking condition when the drive unit is accelerated. The sheet processing apparatus according to claim 1, wherein the sheet processing apparatus is a sheet processing apparatus.   4. The apparatus according to claim 1, wherein the stacking status is at least one of sheet information, a stacking number of sheets, a stacking weight, and a center of gravity position of the sheets stacked on the sheet stacking unit. Sheet processing device.   5. The sheet discharge unit according to claim 1, wherein the sheet moving unit is a sheet discharge unit that discharges the sheet by moving while abutting on the sheets stacked on the sheet stacking unit. Sheet processing device.   The drive mode determination unit determines a drive mode of the drive unit according to vibration information of a natural vibration generated in the sheet discharge unit when the sheet stacked on the sheet stacking unit and the sheet discharge unit are in contact with each other. The sheet processing apparatus according to claim 5.   The drive mode determination unit determines a drive mode of the drive unit so that a moving speed of the sheet discharge unit is decelerated when the sheet stacked on the sheet stacking unit contacts the sheet discharge unit. The sheet processing apparatus according to claim 5 or 6.   The sheet processing apparatus according to claim 6, wherein the driving mode determination unit determines the magnitude and acceleration time of the first acceleration and the second acceleration according to the vibration information.   The drive mode determination unit may include the first acceleration and the first acceleration in the drive mode of the drive unit when accelerating the sheet discharge unit after contact between the sheet stacked on the sheet stacking unit and the sheet discharge unit. The sheet processing apparatus according to any one of claims 6 to 8, wherein a magnitude of two accelerations and a timing for accelerating the drive unit are determined according to the vibration information.   The sheet processing apparatus according to claim 6, wherein the vibration information is at least one of a frequency, a period, and an amplitude of the natural vibration.   11. The drive mode determination unit according to claim 2, wherein the drive mode determination unit determines a predetermined drive mode as a drive mode of the drive unit when an amplitude of the natural vibration is equal to or less than an allowable value. Sheet processing equipment.   The sheet processing apparatus includes at least a sheet supply apparatus for stacking sheets to be supplied, a sheet discharge apparatus for stacking discharged sheets, a sheet stacking apparatus for stacking discharged sheets, and a document reading apparatus for stacking originals to be read. The sheet processing apparatus according to claim 1, wherein the sheet processing apparatus is any one. An image forming apparatus for forming an image on the sheet;
An image forming system comprising the sheet processing apparatus according to claim 1. A sheet stacking unit for stacking conveyed sheets;
A sheet moving section for moving the stacked sheets;
A drive unit for driving the sheet moving unit;
A control program for a sheet processing apparatus comprising:
Determining a driving mode of the driving unit according to a stacking state of sheets in the sheet stacking unit;
Controlling the drive of the drive unit according to the determined drive mode;
A control program for a sheet processing apparatus, wherein A sheet stacking unit for stacking conveyed sheets;
A sheet moving section for moving the stacked sheets;
A drive unit for driving the sheet moving unit;
A method for controlling a sheet processing apparatus comprising:
Determine the drive mode of the drive unit according to the sheet stacking status in the sheet stacking unit,
A control method for a sheet processing apparatus, wherein driving of the driving unit is controlled in accordance with the determined driving mode.