JPH02147565A - Posterior processing device for sheet - Google Patents

Abstract

PURPOSE:To prevent the bulging-out of a folded part without requiring a special driving means by shifting the position of the second piling means for the first sheet and the second and the succeeding sheets when the sheets folded over the first and the second piling means are successively piled. CONSTITUTION:When a series of sheets S which are folded by the folding means 27a of a sheet posterior processing device 27 are successively piled over the first piling means 77 and the second piling means 103, a control means drives a tray raising motor in the piling for the first sheet S and the piling of the second and the succeeding sheets S, and the position of the second piling means 103 is shifted. In other words, the uppermost sheet S piled on the second piling means 103 is set nearly equal to the level of the first piling means 77, and the piling of the second and the succeeding sheets S is stabilized. Thus, the need of installing a special driving means is obviated, and the bulging-out of the folded part of the piled sheet can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to a sheet post-processing device used in image forming apparatuses such as copying machines and laser beam printers. The present invention relates to a sheet post-processing device.

(B) Prior Art Conventionally, sheet post-processing devices equipped with folding means and stacking means are known, but the sheet post-processing device 27' is
As shown in FIG. 1, a folding device 27'a that folds the sheet ejected from the image forming apparatus 1' into two or two folds;
It is comprised of a finisher device 27'b, etc., which collects or stitches the sheets folded by the folding device 27'a. The finisher device 27'b also includes a stack tray 103 for stacking sheets, a processing tray 103a for binding sheets, and a stack of sheets that are bound by the processing tray 103a and dropped below the tray 103a. A storage tray 103b is provided.

However, in the sheet post-processing device 27' described above, when a large number of Z-folded sheets are placed on the stack tray 103,
Due to the difference in thickness between the folded part and the unfolded part, only the folded part bulges out, which may impede the ejection of subsequent sheets, disturb sheets that have already been aligned and stacked, or cause sheets to bulge out. Stable accumulation was difficult because it caused skewing of the particles.

As a solution to this drawback, the stack tray 103 moves to a substantially horizontal position when stacking Z-folded sheets (see FIGS. 12(a), (b), and (c)).
Or, the angle of the base end 103C of the stack tray 103 is
There is a structure in which the stack tray 103 gradually becomes horizontal as it descends (see FIG. 13(a),
(see (b)).

(c) Problems to be Solved by the Invention By the way, the sheet post-processing device and the stack tray 10 in which the stack tray 103 described above moves to a substantially horizontal position
In a sheet post-processing device configured such that the base end 103c of the tray 103 or the base end 1
This method requires a driving means to move the 03c, which has the drawback of increasing costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sheet post-processing device that eliminates the above-mentioned problems by preventing the folded portion from bulging without requiring any special driving means.

(d) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, as shown with reference to FIGS. a folding means (27a) for folding sheets (S); a first loading means (77) for loading sheets (S);
is arranged adjacent to the loading means (77) of the sheet (S).
) and supports the leading end of the sheet (S) loaded on the first loading means (77).
A sheet post-processing device (27) comprising: a moving means (27) that movably supports the second loading means (103) and moves the second loading means (103); M4), and a series of sheets (S) folded by the folding means (27a) are sequentially stacked across the first stacking means (77) and the second stacking means (103). In this case, the position of the second stacking means (103) is moved between when stacking the first sheet (S) and when stacking the second and subsequent sheets (S). The present invention is characterized by comprising a control means (62) for controlling the moving means (M4).

Further, a post-processing means (85) for binding, punching, etc. may be provided near the first loading means (77).

(f) Operation Based on the above-described configuration, a series of sheets (S) folded by the folding means (27a) are sequentially straddled between the first loading means (77) and the second loading means (103). When loading,
The control means (62) controls the control when loading the first sheet (S) and when loading the second and subsequent sheets (S).
The moving means (M4) is controlled to move the position of the second loading means (103).

Note that the above-mentioned symbols in parentheses are shown for reference and do not limit equivalent configurations.

(f) Example Embodiments of the present invention will be described below along with the drawings.

As shown in FIG. 1, the copying machine 1 has a main body 3 containing a copying section 2, and the main body 3 has a platen 5, a platen 5,
Light source 6, mirrors 7, 8, 9, 10, lens 11, two cassettes 12, 13 and deck 15 for storing sheet S
Paper feed rollers 16, 17, 19 are disposed above the cassette 12, 13 and deck 15, respectively, and a transport section is provided downstream of the paper feed roller 19 on the side of the main body 3. 20, and a pair of registration rollers 21 is provided downstream of the conveyance section 20 and the paper feed rollers 16, 17.
is installed. Furthermore, downstream of the roller pair 21,
The copying section 2 is provided, and downstream of the copying section 2, a conveyor belt 22 and a fixing device 23 are provided. A pair of discharge rollers 24, a flapper 25, and a pair of paper discharge rollers 26 are arranged downstream of the fixing device 23, and downstream of the pair of paper discharge rollers 26, adjacent to the copying machine main body 3, A sheet post-processing device 27 is provided, which includes a folding section 27a that folds the sheet S in half or Z-fold, and a finisher section 27b that folds or stabilizes the sheet S. Further, a re-conveyance path 29 is provided branching off from the flapper 25, and the re-conveyance path 29 is provided with an intermediate tray unit N30. In addition, what is shown by Sl, S2, and 83 is a sensor.

On the other hand, the copying machine main body 3 is provided with an automatic document feeder 31 on its upper part, and the feeder 31 has a document tray 32 on which documents M are stacked. A paper feed roller 3 for feeding the document M on the tray 32 is placed near the tray 32.
3 is disposed, and downstream of the roller 33, a separation belt 35 that rotates counterclockwise and a conveyor belt 36 that rotates counterclockwise are disposed. In addition, the belt 3
6, there is a sensor 37 for detecting the size of the document M;
39 are arranged linearly in the transverse direction with respect to the document conveyance direction, and downstream of the sensors 37 and 39, a driving roller 40
A conveyor belt 42 is stretched between the driven roller 41 and the driven roller 41 .

Furthermore, a flapper 45 is disposed on the document discharge section 43 on the left side of the belt 42, and a conveyance path 46°47.49 is provided around the flapper 45, which is switched and guided by the flapper 45. It is being A pair of conveying rollers 50 is disposed on the conveying path 46, a pair of conveying rollers 51 is disposed on the conveying path 47, and a discharge roller 52 is disposed on the conveying path 49. has been done. Note that the reference numeral 84 in the figure is a sensor that detects one cycle of the sheet.

Furthermore, the sheet post-processing device 27, as shown in FIG.
The controller 61 includes a central processing unit (CPU) 62, a ROM 63 that stores a control program for controlling the CPU 62, and a RAM 65 as a main storage device, and controls loads such as a main motor. It is connected to an output interface 66 that outputs signals and an input interface 67 that inputs detection signals from each sensor. Further, each load, each sensor, etc. of the copying machine main body 3 and automatic document feeder 31 are also connected via respective interfaces (not shown). The output interface 66 is connected to a bundle conveyance motor Ml, a swing motor M2, a stepping motor 82, a stapler motor M3, a tray lifting motor M4, and a conveyance motor M5. Detection sensors S5, 36, width board home position sensor S7, seat level sensor 105, and micro switch 97 are connected.

Further, the sheet post-processing device 27 has a swingable hook 70 that engages with an engagement member 69 provided on the side surface of the copying machine main body 3, as shown in FIGS. 3 and 4. Ori,
When the hook 70 engages with the engagement member 69,
The sheet post-processing device 27 is configured to be positioned. A pair of paper ejection rollers 26 are provided on the side of the device 27.
A carry-in lower 1 is provided for carrying in the sheets S discharged by the conveyor, and a deflector 2 is disposed downstream of the carry-in lower 1. Further, a first conveyance path 73 is provided downstream of the deflector 2, and a pair of conveyance rollers 75 is disposed on the path 73. Furthermore, the first conveyance path 73
A pair of paper discharge rollers 76 is disposed downstream of the roller pair 76, and a processing tray 77 is disposed downstream of the pair of rollers 76. A portion of a belt 79 is wound around the lower roller 78a of the roller pair 76, and the lower end of the belt 79 is in contact with the processing tray 77. Further, the tray 77 is provided with a movable width plate 80 and a positioning plate (not shown) for aligning the width direction of the sheets S, and a rack 81 is provided at the bottom of the width plate 80. The rack 81 meshes with a pinion gear 83 driven by a stepping motor 82 disposed below the processing tray 77 . Further, a stapler 85 is disposed adjacent to the processing tray 77, and the stapler 85
is adapted to bind the sheets S stacked on the tray 77. A paper ejection roller 86 is disposed at the tip of the tray 77, and the roller 86 is provided with a swinging arm 88 that is swingably supported by a shaft 87. A roller 89 comes into contact with it. A guide lever 90 is provided upright on the guide 88, and a spring 92 whose one end is fixed to the fuselage frame 91 is connected to the lever 90, so that the swing guide 88 is moved counterclockwise. energized. Furthermore, a disc 93 rotated by a swing motor M2 is disposed adjacent to the guide lever 90, and a pin 95 that engages with the guide lever 90 is provided upright on the disc 93. . and,
A plate spring 96 having a letter-shaped shape when viewed from the front is swingably supported adjacent to the disc 93, and a microswitch 97 is disposed adjacent to the spring 96. Further, a rail plate 99 is provided on the body frame 91 so as to extend in the horizontal direction, and a rotatable roller 101 provided on a drainboard guide 100 is supported by the rail plate 99. A tray moving table 102 is supported by the guide 100 so as to be movable up and down, and a stack tray 103 having a concave base end and on which sheets S are stacked is disposed on the moving table 102. In addition, the swing guide 88
is provided with a sheet level sensor 105 that detects the level of the sheets S loaded on the stack tray 103, and the sensor 105 is connected to a sensor lever 106 and a photo sensor that come into contact with the sheets S loaded on the stack tray 103. 107. On the other hand, a second transport path 109 is provided branching off from the deflector 72, and a deflector 110 is provided at the end of the transport path 109. Further, a third conveyance path 111 is provided downstream of the deflector 110, and the third conveyance path 111 is bent.
The inner guide surface 1 is constituted by a large roller 112, and the conveyance path 111 communicates with the first conveyance path 73. Furthermore, the folding conveyance path 1 is branched to the deflector 110.
13 is provided, and the folding portion 27a is provided downstream of the conveyance path 113. In addition, 85°S6 in the figure
What is shown is a sheet detection sensor that detects the sheet.

As shown in FIG. 5, the folding portion 27a is brought into contact with and separated from the conveyor path 113 by a solenoid (not shown), and is provided with a pair of contact pressure conveyor rollers 115, on the downstream side of the conveyor path 113. A first folding roller 116 is provided. Further, a second folding edge 117 and a Mylar film 119 are arranged adjacent to the roller 116, and a first folding conveyance path 120 is arranged downstream of the Mylar film 119. . Furthermore, the conveyance path 1
20 includes movable stoppers 121 and 122 that move forward and backward into the conveyance path 120 by a solenoid or the like, and a sheet end sensor 12.
3 and a fixed stop 125 are arranged adjacent to the nip of the first and second folding rollers 116, 117.
A deflector 126 is provided to branch and guide the sheet. A second folding conveyance path 127 is disposed downstream of the deflector 126, and a movable stopper 129 and a fixed stopper 130 are disposed on the conveyance path 127, which are moved forward and backward into the conveyance path 127 by a solenoid or the like. It is set up. Also, the second deflector is branched to the deflector 126.
A folding roller 117 and a third folding roller 131 are disposed in contact with the third folding roller 117, and a folding end conveyance path 132 is provided downstream of the roller 131. A pair of transport rollers 133 and 135 are provided.

Next, the operation of this embodiment will be explained with reference to the flowcharts in FIGS. 7(a) and 7(b).

When the power is turned on, the CPtJ 62 clears the stored sheet number counter to 0, reverses and starts the stepping motor 82, and moves the width plate 80 toward the home position. Then, the CPU 62 stops the stepping motor 82 after confirming that the width board 80 is located at the home position based on the signal from the width board home position sensor S7. Furthermore, the CPU 62 controls the tray lifting motor M4.
is turned ON, and the stack tray 103 moves to the sensor lever 106.
The seat level sensor 105 is turned on by contacting the lever 106 and swinging the lever 106 . Then, the CPU 62 stops the tray lifting motor M4 and ends the movement of the stack tray 103. As a result, the tray 103 becomes ready to store the sheets S.

Then, when the document M is loaded on the document tray 32 and a start key (not shown) is turned on, a motor (not shown) is rotated to drive the paper feed roller 33, and the separation belt 35 and conveyance belt 36 are rotated counterclockwise. driven in the direction.

The originals M stacked on the original tray 32 are
The sheets are fed by a paper feed roller 33, and separated and conveyed one by one from the bottom by a separation belt 35 and a conveyor belt 36.

Then, the document M is conveyed between the platen 5 and the conveyor belt 42, and conveyed and stacked on the document reference position on the platen 5 by the conveyor belt 42. Then, the image of the original M is read by the lamp 6, the mirror 7.8.degree. 9.10, and the lens 11, and an image is formed on the copying section 2. On the other hand, the cassette 12. selected by a selection switch (not shown).
13 or from the deck 15 to the paper feed roller 16
．． 17 or 19, and the sheet s is further conveyed by a pair of registration rollers 21 in synchronization with the image formed on the copying section 2. Then, the sheet S is
The image is copied by the transfer belt 22, and further conveyed to the fixing device 23 by the conveyor belt 22. Next, the sheet S is transferred to the fixing device 23.
In the case of single-sided copying, the sheet is guided by a flapper 25 and conveyed to a sheet post-processing device 27 by a pair of sheet discharge rollers 26 . Further, in the case of multiple copying or double-sided copying, the sheet S is branched and guided by the flapper 25 and conveyed to the re-conveying path 29. Further, by the same operation as described above, the sheet S has a second image copied thereon and is conveyed to the sheet post-processing device 27.

On the other hand, the CPU 62 of the sheet post-processing device 27
When a start signal is received from
l, to drive each roller. At this time, if the two-fold mode and the binding mode are selected from the operation unit (not shown) of the copying machine 3, the CPU 62 rotates the disc 93 by a predetermined amount using the swing motor M2, and rotates the disc 93 by a predetermined amount. The guide lever 90 is swung clockwise by the bin 95 that rotates together (
(See Figure 4). Further, due to the swinging of the lever 9, the swinging guide 88 swings clockwise about the shaft 87, and the swinging roller 89 and the paper discharge roller 86 are separated from each other. Then, the sheet S discharged from the copying machine 3 is carried in from the carry-in lower 1 and guided to the second conveyance path 109 by the deflector 72. Then, the sheet S is guided to a conveyance path 113 by a deflector 110, and the sheet S is guided by a pair of conveyance rollers 115 to a first
The paper is transported to the folding transport path 120. Furthermore, the tip of the sheet S is moved by the roller pair 115 to the movable stopper 12.
1, 122 or the fixed stopper 125, it is conveyed with a weak conveying force, and the first and second folding rollers 116,
The mylar film 119 is pressed and bent near the nip 117 to form a loop. The sheet S is transported by the conveying force of the pair of conveying rollers 115 and the mylar film 119.
A predetermined amount of loop is maintained in a state in which the force to bend the sheet S is equal to the force applied by the sheet S to eliminate the loop (see Fig. 4(a)), and then a solenoid (not shown) is turned on. As a result, one roller of the transport roller pair 115 is separated from the other roller. As a result, the Mylar film 119 returns to its original state due to its elastic force, and the sheet S also eliminates the loop due to its waist (see Figure 6(b)).
, skew is corrected. Then, when the solenoid is turned off, the sheet S forms a loop again (Fig. 6 (
c)), then the pressurizing solenoid (not shown) turns on.
Then, the conveying roller pair 115 has a total pressure of 600 to 100
Pressure is applied at 0g to obtain strong conveying force. Then, the sheet S is encouraged to form a loop by the roller pair 115, and the loop is sandwiched between the folding roller pair 116, 117 and the first
A fold is formed, and the paper is conveyed to the second fold conveyance path 127 with the fold first. Further, when the leading end of the sheet S contacts the movable stopper 129 or the fixed stopper 130 to form a loop, a second fold is formed by the pair of folding rollers 117 and 131, and the Z-folding is completed (Fl).
, and the CPU 62 turns the transport motor M5 ONL/
(F2), the Z-folded sheet S is conveyed by a pair of conveying rollers 133
, 135 and the large roller 112, the sheet is conveyed to the first conveyance path 73 through the folding end conveyance. Then, the sheet S
When the leading edge of the sheet is detected by the sheet detection sensor S5 (F3) and the trailing edge is further detected by the sensor S5 (F4), the CPU 62 that receives the signal from the sensor S5 starts the tray storage timer set at a predetermined time. (F1
5) Then, the sheet S is ejected across the processing tray 77 and the stack tray 103 by the paper ejection roller pair 76 (see FIG. 8(a)).Furthermore, when the tray storage timer ends (F6 ), the CPU 62 turns on the stepping motor 82 in the normal direction (F7) and starts the width adjustment counter (F8). As a result, the sheet S is abutted against the positioning plate by the width plate 80 and aligned in the width direction, and the sheet ejecting roller 86 rotates clockwise only with respect to the first sheet S. A belt 79 rotating clockwise abuts against the base end of the processing tray 77 and aligns the processing tray 77 in the front-rear direction. after that,
When the width adjustment counter ends (F9), the CPtJ82 stops the stepping motor 82 (FlO).
, the number of stored sheets counter increments (Fll), and then, based on the signal from the sensor S4, it is determined whether or not the original M has gone through one cycle, that is, whether one cycle of copying processing has been completed (F12). If it is determined that the copy process of the cycle has not been completed, the CPU 82 determines whether the number of stored sheets counter is equal to the specified number of sheets (F13); if the CPU 82 determines that the counter is not equal to the specified number of sheets, the CPU 62 , the stepping motor 82 is turned on in reverse (F14), and when the width-adjusting home position sensor S7 is turned on (F15), the CPU 62 receiving the ON signal from the sensor S7 stops the stepping motor 82 (F16), as described above. Perform operations after F3.

If it is determined that one cycle of copying processing has been completed, the CPU 62 turns off the transport motor M5 (F17), and starts the swing motor M2 to rotate the disk 93 clockwise (F18).

Then, due to the rotation of the disc 93, the urging force of the guide lever 90 by the pin 95 disappears, and the lever 90 is moved by the spring 92.
is biased counterclockwise. Then, the lever 9
0 comes into contact with the leaf spring 96 and swings the spring 96 counterclockwise, the microswitch 97 turns ON (F19),
The CPU 82 receiving the ON signal of the switch 97 stops the swing motor M2 (F20).
0 swing, the swing guide 88 is integrated with the lever 90.
The output roller 86 and the swing roller 8 also swing counterclockwise.
9 come into contact with each other (see FIG. 8(b)).

After confirming that the sheet S is on the processing tray 77 using a sensor (not shown), the CPU 62 operates the stapler 85 to staple the sheet bundle S (F
21), then when stable is finished (F22)
, the CPU 62 lowers and turns on the tray lifting motor M4 (F23), further starts a lowering amount timer according to the stored sheet number counter (F24), and further lowers the stack tray 1.
03 descends by a predetermined amount and the descending amount timer ends (F
25), the CPU 62 stops the tray lifting motor M4 (F26), and the CPU 82 turns on the stepping motor 82 in reverse (F27), and starts the width-approach escape amount counter (F28). 8
0 is saved and the width-approaching escape amount counter ends (F2
9), the CPU 82 turns off the stepping motor 82 (F30), and the CPU 62 turns off the bundle conveyance motor M1.
is turned ON (F31), the bundle conveyance push-out amount counter is started L/ (F32), and the sheet bundle S... is discharged onto the stack tray 103 by the pair of paper discharge rollers 86 and the pair of swinging rollers 89 ( (See Figure 8(c)) At this time,
The sensor lever 106 is pushed up by the sheet bundle S, and the beam of the photosensor 107 is turned on (see FIG. 9). When the extrusion amount counter ends (F1a), the CPU 62 controls the bundle conveyance motor. Stop M1 (F34) and determine whether the job is finished (F35)
). Then, if it is determined that the job is finished, the CP
U82 finishes the work (F3O), and if it is determined that the job is not finished, CPLJ62 turns on the swing motor M2.

(F37) Disc 93 rotated by the motor M2
The guide lever 90 swings and the micro switch 97
distance from. Then, the switch 97 changes to 0FFL/
(F1a), the CPU 62 receiving the OFF signal of the switch 97 starts a swing timer (F39)
Then, when the swinging roller 89 is separated from the paper ejection roller 86 by a predetermined pressure Ill (see FIG. 8(e)), and the swing timer ends (F2O), the CP[J62 starts processing for the second copy. (F41), the CPU 62 raises the tray lifting motor M4 to raise the stack tray 103 (F42), and the sensor lever 106 moves the tray 103 upward.
It swings in contact with the topmost sheet S accumulated in the
The seat level sensor 105 is in the ON state (F1a)
, further, a CP that receives an ON signal from the sensor 105.
tJ62 is set after turning off the tray lifting motor M4 (F
44), the lowering is turned on (F45), and the tray lowering timer is started (F46), and the stack tray 103 is lowered by a predetermined pressure of 1Il (α) from the processing tray 77 (FIG. 8(d), (8) ), when the lowering timer ends (F47), the CPU 62 stops the tray lifting motor M4 (F1a). Note that the predetermined pressure l1tl(α) is applied to the first sheet S of the second set. This is the distance to avoid hitting the folded part of the top sheet S of the first set when it is ejected across the tray 77 and the stack tray 103, and it depends on the degree of Z-folding and the ejection speed. etc. is set in advance. Then, when the first sheet S of the second copy, in which the image is copied and folded in half by the same operation as described above, is discharged onto the processing tray 77 (F49) (FIG. 8(f) ), cp0
62 raises and turns on the tray lifting motor M4 (
F2O), start tray lift timer (F51
). Then, the uppermost sheet S stacked on the stack tray 103 becomes approximately on the same plane as the processing tray 77 (see FIG. 8(g)). When the tray up/down timer ends (F52), the CPU 62 starts the tray up/down process. Turn off motor M4 (F53). As a result, the first sheet S becomes flat, and the stacking of the second and subsequent sheets in the second section is stabilized. Then, by the same operation as described above, the processing tray 77
When the second and subsequent sheets S are stacked on top (F54), and a predetermined number of sheets S are stacked, the stack is conveyed after being stabilized by the same operation as described above from F17.

In the above-mentioned embodiment, the sheet bundle is pinched and conveyed by the paper ejection roller 86 and the swinging roller 89, but the sheet bundle is not limited to this, and as shown in FIGS. , the processing tray 77 is configured to be tiltable;
When conveying the stacked sheet bundle, the tray 77 may be tilted so that the sheet bundle slides on the tray 77.

Further, in the above-described embodiment, the leading edge of the first sheet of the second portion is supported on substantially the same plane as the processing tray 77 by the sheets stacked on the stack tray 103, but this is not limitative. First, as shown in FIG. 10(e), a retractable support member 136 may be provided to support the leading edge of the first sheet of the second portion.

(G) As described in detail, according to the present invention, when a series of sheets folded by the folding means are sequentially stacked across the first stacking means and the second stacking means, When loading the first sheet and when loading the second and subsequent sheets,
Since the second loading means is configured to move its position,
No special driving means is required, and costs can be reduced.

Furthermore, if post-processing means for binding, perforating, etc. is provided near the first stacking means, various post-processing of sheets can be performed.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing a sheet post-processing device according to the present invention, and FIG. 2 is a block diagram showing a control section thereof. Further, FIGS. 3 to 5 are front sectional views showing essential parts of the sheet post-processing apparatus according to the present invention. Furthermore, Fig. 6(a), (b), (c)(d) and Fig. 8(a)
), (b), (c), (d), (e)
(f), (g) and FIG. 9 are diagrams showing the operation of the present invention. FIGS. 7(a) and 7(b) are flowcharts showing the operation of the present invention. In addition, Fig. 10 (a
), (b), and (C) are front views showing other embodiments of the present invention. Furthermore, Fig. 11, Fig. 12 (a) (b)
), (C) and FIGS. 13(a) and (b) are front sectional views showing conventional examples. 62... Control means 77... First loading means,
85... Post-processing means 85... Post-processing means 10
3...Second loading means

Claims (1)

[Claims] 1. A folding device that folds a sheet into two or a Z-fold, a first stacking device that stacks the sheet, and a device that is disposed adjacent to the first stacking device and that stacks the sheet. and a second stacking means for supporting the leading edge of the sheets stacked on the first stacking means, the second stacking means being movably supported, and a moving means for moving the second loading means; and a moving means for moving the second loading means; when sequentially stacking a series of sheets folded by the folding means across the first loading means and the second loading means; and a control means for controlling the moving means to move the position of the second stacking means when stacking the first sheet and when stacking the second and subsequent sheets. A sheet post-processing device featuring: 2. The sheet post-processing device according to claim 1, further comprising a post-processing device for binding, perforating, etc. arranged near the first stacking device.