JP5127503B2 - Paper post-processing device - Google Patents

Description

  The present invention is provided integrally or separately in an image forming apparatus such as a copying machine, a printer, or a printing machine, and performs predetermined processing on an image-formed sheet (sheet-like recording medium) and sorts it as necessary. Thus, the present invention relates to a sheet post-processing apparatus loaded on a tray.

  Conventionally, in order to provide a paper processing apparatus having a simple configuration, the paper discharged by the discharge means can be sorted in a neatly arranged state on a tray that moves in a shift direction orthogonal to the discharge direction. A discharge means for discharging the discharged paper, a tray for stacking the paper discharged by the discharge means, and a shift perpendicular to the paper discharge direction of the discharge means for sorting the paper stacked on the tray And a tray moving unit that performs a sorting operation by moving a predetermined amount in the direction, and includes a aligning unit that aligns the sheets stacked on the tray, and the aligning unit is discharged from the discharge unit. The position of the end surface of the paper stacked on the tray is brought into contact with the aligning portion so as to sandwich two end surfaces of the paper parallel to the discharge direction. A technology that includes a pair of sheet aligning sections that perform an aligning operation, and that performs the aligning operation so that sheets stacked after the sorting operation are aligned at positions different from those of the sheets stacked before the sorting operation. Is disclosed (for example, see Patent Document 1).

  In such a sheet post-processing apparatus, for example, a sheet formed by an image forming apparatus and sent to the sheet post-processing apparatus passes through a sheet discharge sensor that detects the passage of the sheet and serves as a pair of discharge units. Guided to a paper roller. A tray is positioned below the discharge roller. The paper discharged from the paper discharge roller in the discharge direction (a direction perpendicular to the axis of the paper discharge roller in a substantially horizontal plane) is the inertia after the trailing edge of the paper is separated from the paper discharge roller. And it falls down diagonally by its own weight and is loaded on the tray. If the paper is not on the tray, the distance from the top surface of the tray to the nip of the discharge roller. If the paper is stacked on the tray surface, from the top surface of the stacked paper to the nip. The paper will fall free and land by the distance of the free fall. Also, when shifting, the alignment operation is performed after the paper has dropped onto the top surface of the tray, and then the paper alignment unit is retracted once to a position where it does not interfere with the paper in order to avoid interference with the paper, and at the position after the paper is shifted. stand by.

JP 2006-206332 A

  However, in the conventional technique shown above, a tray is positioned below the discharge roller, and the sheet discharged from the discharge roller in the discharge direction which is an extension of the transport direction is the rear end of the sheet. After the part is separated from the paper discharge roller, it is dropped obliquely downward due to inertia and its own weight and loaded on the tray. For this reason, when the paper is not on the tray, the distance from the top surface of the tray to the nip portion of the discharge roller, and when the paper is stacked on the tray surface, from the top surface of the stacked paper The paper falls and lands for the free fall distance to the nip portion. Therefore, there is a problem that high alignment accuracy cannot be obtained due to free fall. Also, during shifting, the alignment operation is performed after the paper has dropped onto the top surface of the tray, and then the position after the paper is shifted after the paper alignment unit has been withdrawn once to avoid interference with the paper. There was a problem that the productivity was not improved because it waited at the end.

  The present invention has been made in view of the above, and an object thereof is to provide a sheet post-processing apparatus that satisfies both high shift alignment accuracy and high productivity.

In order to solve the above-described problems and achieve the object, the invention according to claim 1 includes a shift movement unit that receives the post-processing target paper, performs post-processing, discharges the paper onto the tray, and shifts the tray. A sheet post-processing device for sorting on the tray, wherein the first aligning unit is arranged to be slidable on both ends of the discharged sheet, and performs an aligning operation in contact with the side edge of the sheet; A second aligning unit disposed inside the first aligning unit, slidably moved to both ends of the sheet to contact the side end of the sheet, and retractable from the tray surface; the first aligning unit; and control means for controlling in accordance with the mode that is set in advance the second aligning means, wherein, when the mode is not performed shift operation, assortment only the first matching means And performing the operation.

The invention according to claim 2 is a paper post-processing apparatus that receives a post-processing target paper, performs post-processing, discharges the paper onto the tray, and sorts the paper on the tray by a shift moving unit that shifts the tray. A first aligning means that is slidably disposed on both ends of the discharged paper and that is in contact with the side edges of the paper to perform an aligning operation; The second aligning means, the first aligning means, and the second aligning means that are slidably moved to both ends of the sheet, abut against the side edges of the paper, and retractable from the tray surface, are set in a preset mode. Therefore comprising control means for controlling the said control means, one of the first matching means and said second matching means is arranged for each position of each of the classified paper sheet integer Sometimes, and it performs an operation alignment using only the first matching means.

According to a third aspect of the present invention, when the control unit shifts the tray, the first alignment unit and the second alignment unit are also aligned with the sheet end surface in synchronization with the shift of the tray. It is characterized by moving.

The invention according to claim 4 is characterized in that at least the surfaces of the first alignment means and the second alignment means are made of an elastic material.

  The paper post-processing apparatus according to the present invention is slidably disposed at both ends of the discharged paper, and is in contact with the side edges of the paper to perform an aligning operation, and the first aligning means , A second alignment means that slides toward both ends of the paper, contacts the side edges of the paper, and can be retracted from the tray surface, the first alignment means, and the second alignment Control means for controlling the means in accordance with a preset mode, so that a pair of alignment portions can be arranged at each alignment position so that high productivity can be achieved and alignment operation can be performed reliably. There is an effect that a post-processing apparatus can be provided.

  Exemplary embodiments of a sheet post-processing apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Embodiment)
FIG. 1 is an explanatory diagram showing a configuration of an image forming system according to an embodiment of the present invention. FIG. 12 is a block diagram showing the configuration of the image forming system. In FIG. 12, the description will be made including the part overlapping with FIG. Reference numeral 50 denotes an image forming apparatus such as a copying machine or a printer, reference numeral 70 denotes a system controller for controlling the entire image forming apparatus, reference numeral 71 denotes an image forming engine for forming an image on recording paper, and reference numeral 12 denotes various operation settings (rear) An operation unit having a panel for displaying a group of keys (including a processing mode), a setting state of the apparatus, a mode key that can be input, and the like.

  Reference numeral 51 denotes a paper post-processing apparatus, reference numeral 60 denotes a microcomputer system such as a CPU, ROM, RAM, etc., which controls each part of the apparatus, reference numeral 36 denotes an inlet sensor, and reference numeral 8 a denotes a proof tray 14. Branch claw for switching between the conveyance of the paper and the conveyance to the tray 12, reference numeral 67 is a branch claw solenoid for operating the branch claw 8a, and reference numeral 8b is a branch for switching between the conveyance to the staple tray 69 or the conveyance to the tray 12. Reference numeral 68 denotes a branch claw solenoid that operates the branch claw 8b, reference numeral 69 denotes a staple tray on which paper is temporarily stacked at the time of stapling, reference numeral 62 denotes a jogger fence that aligns the staple tray 69, and reference numeral 20 denotes a sheet bundle on the staple tray 69. Is a stapler for binding.

  Reference numeral 64 denotes a height sensor for detecting the discharge height of the tray 12, reference numeral 12 denotes a tray having a lifting and shifting function, reference numeral 65 denotes a lifting drive unit for lifting and lowering the tray 12, and reference numeral 66 shifts the ray 12. Reference numeral 102a is a drive motor for driving the paper alignment section 102a, reference numeral 107a is a home sensor for detecting the home position of the paper alignment section 102a, reference numeral 102b is a paper alignment section, reference numeral 104b. Is a drive motor that drives the paper alignment unit 102b, 107b is a home sensor that detects the home position of the paper alignment unit 102b, 110a is a paper alignment unit, 114a is a drive motor that drives the paper alignment unit 110a, and 121a is Home sensor 120 for detecting the home position of the sheet aligning unit 110a Is a solenoid for performing the retracting / non-retreating operation of the sheet aligning unit 110a, reference numeral 110b is a sheet aligning unit, reference numeral 114b is a drive motor for driving the sheet aligning unit 110b, and reference numeral 121b is a home sensor for detecting the home position of the sheet aligning unit 110b. Reference numeral 120b denotes a solenoid that performs a retraction / non-retraction operation of the sheet aligning unit 110b.

  Further, in FIG. 1, reference numeral 90 denotes an alignment unit (see FIG. 4) by each configuration (see FIG. 4) including the paper alignment sections 102a and 102b, and reference numeral 80a denotes a tray facing the moving portion of the paper alignment sections 102a and 102b. 12 is a concave portion provided in FIG.

  As described above, this system mainly includes the image forming apparatus 50 and the sheet post-processing apparatus 51 including the sheet aligning unit, and the system controller 70 and the control unit 60 are connected to be able to communicate with each other. That is, the control unit 60 of the paper post-processing device 51 controls each unit of the paper post-processing device 51 in accordance with a control signal from the system controller 70 of the image forming apparatus 50. The system controller 70 transmits a control signal to the control unit 60 in accordance with a post-processing mode input from the operation unit 72 or an external host computer (not shown), and the control unit 60 performs post-processing according to the control signal. Control each part.

  As shown in FIG. 1, the paper post-processing device 51 has a tray 12 that can be moved up and down as a paper stacking unit, and a Bruch tray 14 that is fixed in position and does not move. The tray 12 is controlled to move up and down by a lift drive unit 65 (see FIG. 12). In addition, the height of the tray 12 is detected by the height sensor 64, and the height of the sheets stacked on the upper surface of the tray 12 is controlled to be constant.

  An entrance sensor 36 and an entrance roller pair 2a are provided in the vicinity of the image forming apparatus 50 and the paper delivery portion, and the paper taken in by the entrance roller pair 2a is transported to the respective transport paths according to the post-processing mode. The

  When the proof mode is selected, the sheet delivered from the image forming apparatus 50 is conveyed to the conveying roller 2b by the entrance roller pair 2a, and the position is switched by on / off control of the branch claw solenoid 67 (see FIG. 12). The paper is discharged to the proof tray 14 by the paper discharge roller 5b via the conveyance roller 5a by the possible branch claw 8a.

  When the staple mode is selected, the paper delivered by the pair of entrance rollers 2a is conveyed by the conveyance roller 2b, and the branch can be switched by the on / off control of the branch claw solenoid 68 (see FIG. 12). The paper is stacked on the staple tray 69 by the paper discharge roller 6 via the conveying rollers 4a, 4b, and 4c by the claw 8b. At this time, alignment in the paper conveyance direction (reference fence 19) is performed by a hitting roller (not shown), and alignment in the horizontal width direction (direction orthogonal to the conveyance direction) is performed by the jogger fence 62. When the predetermined number of sheets is aligned, the stapler 20 performs a binding process, and the sheet bundle lifted by the discharge claw 10a provided on the discharge belt 10 is discharged to the tray 12 by the paper discharge roller 3 and stacked.

  When the shift mode is selected, the paper is discharged from the pair of entrance rollers 2a to the tray 12 by the paper discharge roller 3 via the transport rollers 2a, 2b, and 2c and stacked. This embodiment is an example in which the tray 12 is reciprocated in a direction orthogonal to the paper transport direction to sort the paper. That is, the sorting operation is performed by moving the tray 12 in the shift direction c shown in FIG. 3 to sort the sheets (including the sheet bundle) stacked on the tray 12. As shown in FIG. 2, the tray moving mechanism includes a tray supporting mechanism that supports the tray 12 so as to be slidable on the base 8, and a tray reciprocating mechanism that reciprocates the tray 12 in the shift direction c. The tray support mechanism will be described with reference to FIG.

  In FIG. 2, two guide plates 30, 31 having a length in the shift direction c penetrating the paper surface and facing in the left-right direction are integrally provided on the upper portion of the base 8. A shaft protrudes outside each of these guide plates 30 and 31, and rollers 32 and 33 are pivotally supported on the shaft. On the other hand, the bottom of the tray 12 is a flat portion made of a flat surface that is wider than the distance between the rollers 32 and 33 in the direction parallel to the paper conveyance direction and has a depth that can sufficiently cover the shift amount of the tray 12 in the shift direction c. 12 a is formed, and the flat portion 12 a is placed on the rollers 32 and 33. The flat portion 12a of the tray 12 is provided with two shafts at positions corresponding to the inside of the guide plates 30 and 31, and rollers 34 and 35 are pivotally supported on these two shafts, respectively. Has been. These rollers 34 and 35 are in contact with the inner sides of the guide plates 30 and 31. A groove 80a for guiding the sheet aligning portions 102a and 102b is formed on the upper surface of the tray 12 in a direction orthogonal to the sheet conveying direction.

  The rollers 32, 33, 34, 36, the guide plates 30, 31, and the like constitute a tray support mechanism that supports the tray 12 so as to be movable in the shift direction c. With such a tray support mechanism, the load on the tray 12 is supported by the rollers 32 and 33 and can be guided by the guide plates 30 and 31 to move in the shift direction c. Further, by combining the tray 12 supported by the tray support mechanism with the tray reciprocating mechanism, the tray 12 can be reciprocated in the shift direction c by applying a reciprocating driving force to the tray 12.

  In FIG. 3, the tray 12 enters the concavo-convex portion of the end fence 40, and the tray 12 also moves in the same direction when the end fence 40 moves in the shift direction c. A bracket 41 with a long hole 41a is mounted at the center of the end fence 40 in the shift direction c, and a pin 42 is inserted into the long hole 41a.

  The pin 42 is pressed and fixed to a pulley 43 that is pivotally supported by a main body (not shown). This insertion fixing position is eccentric from the rotation center of the pulley 43. The pulley 43 is rotated by a motor 44 via a timing belt 45. The pin 42 is rotated by the rotational movement of the pulley 43, and the tray 12 performs a linear reciprocating motion in the shift direction c according to the amount of eccentricity. The direction of motion is converted as follows. The configuration around the eccentrically rotating pin 42 and the long hole 41a constitutes the main part of the tray reciprocating mechanism.

  FIG. 4 is an explanatory diagram showing a schematic configuration of the sheet aligning unit (aligning means 99 as the first aligning means), which is arranged in the aligning unit 90 of FIG. In FIG. 4, reference numerals 102a1 and 102b1 are alignment parts, reference numerals 102a2 and 102b2 are escape parts, reference numerals 105a and 105b are cradles, and reference numerals 105a1 and 105a2 are slits. Here, the upper end portions of the sheet aligning portions 102a and 102b are fitted in slits 105a1 and 105a2 parallel to a plane perpendicular to the shaft 108 formed on the receiving bases 105a and 105b. The cradles 105 a and 105 are slidably fitted to the shaft 108 and slidably fitted to an axis parallel to the shaft 108. Further, the upper portions of the cradles 105a and 105 are fixed to the timing belts 106a and 106b. The timing belts 106a and 106b are stretched between the pulleys 120a and 120b and the output side pulleys of the drive motors 104a and 104b, which are stepping motors.

  In FIG. 4, the sheet aligning units 102a and 102b for aligning the sheets operate via the timing belts 106a and 106b by rotating the driving motors 104a and 104b for driving the sheet aligning unit forward and backward. The timing belts 106a and 106b are connected to the cradle holders 105a and 105b. The cradle holders 105a and 105b and the sheet aligning portions 102a and 102b are attached by fitting and move together. Further, the sheet aligning portions 102 a and 102 b are attached to the shaft 108. The sheet aligning portions 102 a and 102 b disposed on the outer side are disposed above the paper discharge roller 3.

  Each of the sheet aligning units 102a and 102b is provided with home sensors 107a and 107b, respectively, and detects the home positions of the sheet aligning units 102a and 102b.

  FIG. 5 is an explanatory diagram illustrating a schematic configuration of the sheet aligning unit (second aligning unit). In the figure, sheet aligning sections 110a and 110b for aligning sheets operate via timing belts 116a and 116b by reversing drive motors 114a and 114b by stepping motors that drive the sheet aligning section. The timing belts 116a and 116b are connected to the cradle holders 115a and 115b, and the cradle holders 115a and 115b and the sheet aligning portions 110a and 110b are attached by fitting and move together. Further, the sheet aligning portions 110a and 110b are attached to the shafts 118a and 118b. Also, hooks 119a and 119b are provided at the respective ends of the shafts 118a and 118b, and the hooks 119a and 119b and plungers of the solenoids 120a and 120b are connected by springs 121a and 121b.

  The sheet aligning portions 110 a and 110 b disposed on the inner side are disposed below the sheet discharge roller and are configured to be retractable from the tray 12. As shown in FIGS. 6 (when aligned) and 7 (when retracted), the sheet aligning portions 110a and 110b are fitted to a D-shaped shaft 118 and are fitted to the end of the shaft 118. The sheet alignment unit 110a (110b) can be retracted from the tray 12 by driving the solenoid 119 to turn on / off the solenoid 120a (102b).

  Each of the sheet aligning units 110a and 110b is provided with home sensors 121a and 121b (see FIG. 12), and detects the home positions of the sheet aligning units 110a and 110b.

  The sheet alignment operation (alignment operation) will be described with reference to FIG. The paper S discharged from the paper discharge roller 3 is stacked on the tray 12, and the paper end faces are aligned by a pair of paper aligning portions 102a and 110a. When the shift operation is performed, the sheet aligning unit 110a is retracted by driving the drive source (solenoid) 120, and at the next shift position, the sheet aligning units 102b and 110b perform the aligning operation of the sheet S.

  FIG. 9 shows a first operation example. The inner sheet aligning section 110a waits at a position slightly away from the end face of the discharged sheet. Next, the sheet aligning unit 102a located outside the tray 12 is operated after the sheet is discharged. The sheet aligning unit 102a operates the end face of the sheet S to abut the sheet S against the sheet aligning unit 110a to perform alignment.

  FIG. 10 shows a second operation example. After the final sheet before shifting is discharged and the aligning operation is performed by the sheet aligning units 102a and 110b, the shifting operation is performed by moving the tray 12. At this time, in synchronization with the tray 12, the tray 12 operates in the shift direction with the paper S sandwiched by the paper alignment units 102 a and 110 a.

  By the way, the sheet aligning portions 102a, 102b, 110a, 110b at least have a surface portion made of an elastic material such as ABS resin. Further, the shape of the sheet aligning portion is such that the protruding portion is eliminated and the sheet is not caught. As a result, even when interference occurs when the paper S is removed, the paper is less likely to be damaged.

  Further, in the mode in which the shift operation is not performed, that is, when recording sheets are stacked on the tray 12, both the sheet aligning units 102a and 102b perform a slicing operation, and the alignment accuracy is improved.

  FIG. 11 is a flowchart showing an example of a sheet alignment operation according to the embodiment of the present invention. This control operation is executed by the control unit 60. First, when a start key (not shown) of the operation unit 72 of the image forming apparatus 50 is pressed to start a copying operation (copying), a control signal is sent from the system controller 70 to the control unit 60, and the control unit 60 It is determined whether or not the shift mode is set (step S11). Further, if it is the shift mode (sorting mode), it is determined whether or not to further offset (step S12). Here, for example, in the case where 10 originals are formed and 5 copies of an image are formed, 5 copies of 10 originals (50 in this example) can be copied and loaded without offset movement, or the number of copies (here In this case, it is determined whether or not to stack by offset movement every 10 sheets.

  If it is offset movement in step S12, it is determined whether or not the sheets are aligned (step S13). If it is determined that the sheets are aligned, the inner sheet aligning sections 110a and 110b are operated (step S14), the sheet is further discharged, and the outer sheet aligning sections 102a and 102b are operated to align ( In step S15), alignment with paper discharge is performed (step S16). Subsequently, it is determined whether or not the job is finished (step S17). If the job is finished, the above operation is finished. On the other hand, if the job is not finished, it is further determined whether or not to change the shift direction (step S18). If it is determined that the tray direction is to be changed, the tray 12 is shifted (step S19).

  If the offset is not performed in step S12 or the sheet alignment is not performed in step S13, the tray 12 is not shifted and aligned by operating the outer sheet alignment units 102a and 102b (step S20). (Step S16), and the process proceeds to step S17.

  When the paper is discharged onto the tray 12 during the aligning operation, the paper aligning portions 102a and 102b and the paper aligning portions 110a and 110b are moved to a receiving position at a predetermined interval wider than the paper width and wait in advance. At this receiving position, the paper discharge roller 3 waits for paper discharge. The receiving position is, for example, a position taken about 7 mm wider on one side than the sheet width of a sheet bundle made of A4 size sheets.

  The sheet aligning units 102a and 102b and the sheet aligning units 110a and 110b are waiting at a receiving position with a minimum interval at which sheets discharged with some variation in the shift direction c can be received, and the sheets are discharged. When the paper is stacked on the tray 12, the paper is moved from the receiving position to a position narrower than the paper width and aligned. The reason for setting the receiving position in this way is that it takes time to return to the home position with a large interval for each aligning operation. The position settings of the sheet aligning units 102a and 102b and the sheet aligning units 110a and 110b are stored as programs in the ROM in the control unit 60 in advance for each sheet size. Then, the sheet alignment units 102a and 102b and the sheet alignment units 110a and 110b are shifted in accordance with the sheet size signal transmitted from the image forming apparatus 50, the post-processing mode, and the signals from the home sensors.

  When a predetermined time has elapsed when the paper is discharged from the paper discharge roller 3 and dropped onto the tray 12 and completely stopped, the paper alignment units 102a and 102b and the paper alignment units 110a and 110b are used as a reference for the paper width at the predetermined timing. Make contact at an alignment position that is slightly fit from the position. The degree of the fit is set to, for example, the amount of biting by 1 mm on each side of the paper width.

  Therefore, according to the sheet post-processing apparatus described above, it is possible to provide a sheet post-processing apparatus capable of reliably performing an aligning operation corresponding to high productivity by arranging two pairs of sheet aligning portions at each aligning position. . In addition, the alignment accuracy can be improved by sending the sheet aligning portion excessively from the shift amount. Further, by simultaneously moving the tray operation and the sheet aligning unit at the time of shifting, it is possible to prevent sheet misalignment due to the inertia of the stack of sheets stacked at the time of shifting. In the non-shift mode, the alignment accuracy can be improved by operating both the sheet alignment units 102a and 102b. Further, by using an elastic material for the paper aligning portions 102a and 102b and the paper aligning portions 110a and 110b, it is possible to prevent the paper from being damaged when the user takes it out.

  As described above, the sheet post-processing apparatus according to the present invention is provided in an image forming apparatus such as a copying machine, a printer, or a printing machine as a single unit or as a separate unit, and for an image-formed sheet (sheet-like recording medium). This is useful for a sheet post-processing apparatus that performs a predetermined process, sorts as necessary, and loads it on a tray, and is particularly suitable for an apparatus that requires high productivity and alignment accuracy.

1 is an explanatory diagram showing a configuration of an image forming system according to an embodiment of the present invention. FIG. It is sectional drawing which shows the structure of a tray moving mechanism. It is a perspective view which shows the structure of a tray moving mechanism. It is explanatory drawing which shows schematic structure of a paper alignment part (1st alignment means). It is explanatory drawing which shows schematic structure of a paper alignment part (2nd alignment means). It is explanatory drawing which shows the structure of the retraction | saving mechanism (at the time of alignment) of a paper alignment part (2nd alignment means). FIG. 6 is an explanatory diagram illustrating a configuration of a retracting mechanism (at the time of non-alignment) of a paper alignment unit (second alignment unit). It is explanatory drawing which shows the paper alignment operation example (the 1) concerning embodiment of this invention. It is explanatory drawing which shows the paper alignment operation example (the 2) concerning embodiment of this invention. It is explanatory drawing which shows the paper alignment operation example (the 3) concerning embodiment of this invention. It is a flowchart which shows the example of sheet alignment operation | movement concerning embodiment of this invention. It is a block diagram which shows the structure of the image forming system of FIG.

Explanation of symbols

12 tray 66 shift drive unit 50 image forming apparatus 51 paper post-processing device 60 control unit 70 system controller 102a, 102b paper alignment unit 110a, 110b paper alignment unit

Claims (4)

A paper post-processing device that accepts a post-processing target paper, performs post-processing, discharges the paper onto the tray, and sorts the tray on the tray by shift moving means that shifts the tray.
First alignment means that is slidably disposed at both ends of the discharged paper and that performs an alignment operation in contact with the side edges of the paper;
Second alignment means disposed inside the first alignment means, slidably moved to both ends of the paper, abutted on the side edges of the paper, and retractable from the tray surface;
Control means for controlling the first matching means and the second matching means according to a preset mode;
Equipped with a,
In a mode in which the control unit does not perform a shift operation, the sheet post-processing apparatus is configured to perform the alignment operation using only the first alignment unit . A paper post-processing device that accepts a post-processing target paper, performs post-processing, discharges the paper onto the tray, and sorts the tray on the tray by shift moving means that shifts the tray.
First alignment means that is slidably disposed at both ends of the discharged paper and that performs an alignment operation in contact with the side edges of the paper;
Second alignment means disposed inside the first alignment means, slidably moved to both ends of the paper, abutted on the side edges of the paper, and retractable from the tray surface;
Control means for controlling the first matching means and the second matching means according to a preset mode;
With
The control means performs an aligning operation using only the first aligning means at the time of paper aligning among the first aligning means and the second aligning means arranged for each sorted sheet position. sheet post-processing apparatus for you characterized. 2. The control unit according to claim 1, wherein when the tray is shifted, the first alignment unit and the second alignment unit are also moved in a state where the sheet end faces are aligned in synchronization with the shift movement of the tray. The sheet post-processing apparatus according to 1 or 2 . It said first matching means and said second matching means, at least, the surface of the sheet post-processing apparatus according to any one of claims 1-3, characterized by being composed of an elastic material.

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