JPH06321417A - Sheet after-treatment device provided with sheet bundle transferring means - Google Patents

Abstract

PURPOSE:To prevent a paper sheet from suffering from any damage like breakage due to turn-up, bend etc., while a bundle of sheets on a bin are being transferred, and improve productivity in the case of ransferring sheet bundled. CONSTITUTION:A detection means for copying conditions such as number of copies, paper thickness, temperature and humidity and sheet size is mounted in a sorter body or an image forming device, and based on the detected copying conditions, the transfer speed of a sheet bundle by sheet bundle transferring means 19, 22 is changed to its optimum value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet post-processing apparatus provided with a sheet bundle transfer apparatus, and more particularly, a copy ejected after image formation from an image forming apparatus such as a copying machine, a printing machine, a laser beam printer or the like. The present invention relates to a sheet post-processing device including a sheet bundle transfer device that sequentially sorts and stores sheet members such as paper sheets in a tray (hereinafter referred to as “bin tray”) and then shifts the stored sheet bundle.

[0002]

2. Description of the Related Art Conventionally, a sheet post-processing device (hereinafter referred to as a "sorting device") installed on the discharge side of an image forming apparatus has a limited number of bin trays. It was impossible to sort and store. The following are examples devised to solve this problem.

The sheet bundle once stored in the bin tray is stacked on a stack tray different from the bin tray through the transfer means, and the bin tray is emptied to be newly discharged from the image forming apparatus. It is possible to sort and store sheets. By repeating the transfer from the bin tray to the stack tray, the number of sheets exceeding the number of bin trays is stacked.

In a combination of a finisher having a bin tray that can move vertically and vertically with respect to the sheet conveying direction and an automatic document feeder that can automatically circulate documents, the sheets on the bin tray can be circulated once for each document (one copy). By moving (shifting) the position of the bundle in the direction orthogonal to the conveyance and providing a step on the front and rear sheet bundles, a large number of sheets are sorted and stacked on one bin tray.

[0005]

However, in the conventional example, as shown in FIG. 22 (a), when the sheets loaded on the bin are transported by the sheet transporting means, the total number of sheets to be transported is reduced. Since the weight is large and the sliding resistance between the sheet and the bin is also large, the load applied to the drive unit of the transfer means becomes large. Therefore, in order to increase the transfer speed in order to improve the productivity, it is necessary to use a high output motor or the like, which results in high cost. Further, since the sliding resistance between the sheet and the bin is large, if the moving speed is increased too much, the energy given to the sheet will be affected by the sliding resistance, and the sheet will not be damaged or noise during the transfer. It has an adverse effect. Therefore, under the above conditions, it is necessary to transfer the sheet at an appropriate speed without increasing the transfer speed too much.

Further, as shown in FIG. 22 (b), when a small number of sheets stacked on the bin are transferred, the sliding resistance is small, and therefore the transfer speed is increased without being adversely affected. However, if the sliding speed is set low with reference to the case where the sliding resistance is large,
The productivity of a small number of copies, which is considered to be used relatively frequently, is reduced. On the contrary, if a small number of sheets are transported at high speed, the sliding resistance against the surface of the bin is small, and the sheets fly too much to be uneven.

[0007]

According to the present invention, at least one or more bins for storing discharged sheets, sheet transfer means for moving the sheet bundle on the bins, and sheet transfer means. In the sheet post-processing apparatus having control means for controlling the operation of the sheet transfer means, the transfer speed of the sheet transfer means is made variable in accordance with the condition information such as the number / type of discharged sheets, the type of post-processing, the environment, etc. It is characterized by

Here, the copying condition is the number of sheets stored in the bin, the paper thickness, the special paper selection of the image forming apparatus, the staple binding selection, the sheet size, the temperature and humidity, or the like.

By making the sheet transfer speed variable according to the above copying conditions, the productivity can be improved appropriately.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention for solving the above problems will be described with reference to the accompanying drawings.

FIG. 1 is an overall view of the sheet post-processing apparatus of the present invention. As shown in FIG. 1, an automatic document feeder 300 that automatically circulates originals is installed on the upper surface of the image forming apparatus 200, and 20 bin trays b (b) are provided downstream.
₁ , b ₂ ... b ₁₉ , b ₂₀ ) are attached.

The image forming apparatus 200 uses a well-known electrophotographic method, and a detailed description thereof will be omitted here.
An original document positioned on the platen glass 208 is imaged on the photosensitive drum 201 by an optical system (not shown), and the developing device 202 and the transfer electrode 2 provided around the photosensitive drum 201 are formed.
03, the image is transferred to the sheet and is permanently fixed by the fixing device 205.

The sorting device 100 is a so-called bin moving type sorter, and bin trays b stacked in the vertical direction are raised or lowered one by one by one rotation of the spiral cams 4 provided on both sides.

A sheet on which an image is formed by the image forming apparatus 200 passes through a pair of paper discharge rollers 206 and then the sorting apparatus 100.
To the sorting path 6a and the non-sorting path 6b by the flapper 1 (see FIG. 2). At the time of non-sorting without classifying the sheets, all the sheets pass through the non-sort path 6b (the flapper 1 is at the chain line position) and are discharged to the non-sort tray 10. At the time of sorting for classifying the sheets, the sheets pass through the sort path 6a. When the flapper 1 is in the solid line position, the sheets discharged by the sheet discharge rollers are collected by the bin trays that move up and down in synchronization.

Reference numeral 7 (broken line portion) is an electric stapler for binding sheets with staples and is attached at a predetermined position facing the bin tray b. As shown in FIG. 3, which is a top view of the sorting apparatus 1, the stapler 7 is provided in the bin tray b.
A position (solid line position) 7a for waiting outside the area of No. 2 and a position 7b (chain line position) for advancing into the notch A formed at the corner of the bin tray b to perform the staple binding operation of the sheet Move in.

As shown in detail in FIG. 4, the bin unit 8 holding the bin tray b has a box-like shape in which guide side plates 61 are provided on both sides from the non-sort tray 10 to the base frame 9. In the bin tray b, pins (trunnions) 3 fixed to both sides are inserted into the holes 11a of the guide side plate 11, and the bin tray b is arranged so that the upstream side in the discharging direction is inclined downward. A support plate 11 is attached to the inner side of the base end of the base frame 9. On the support plate 11, an upper end is fixed to the upper arm 12 and a lower end is fixed to the lower arm 13. The central shaft 14 is the support plate 1
1 is rotatably supported by a rotary shaft (not shown) provided on the No. 1 and a rotary shaft 15 provided on the lower surface of the non-sort tray 10. Further, a fan gear 16 is arranged on the support plate 11 so as to be rotatable around a rotation shaft provided on the support plate 11, and the fan gear 16 has the lower arm 1 attached thereto.
3 is fixed. Further, a pulse motor 17 is arranged below the support plate 11, and a gear 18 fixed to the output shaft of the pulse motor 17 meshes with the fan-shaped gear 16. Then, the tip of the lower arm 13 and the upper arm 1
An aligning rod 19 is installed at the tip of 2 through the notch B formed in each bin tray b, and the aligning rod 19 is configured to swing by the rotation of the sector gear 16. ing. Further, the lower arm 13 is provided with a light shielding plate 20, and the light shielding plate 20 swings integrally with the lower arm 13 so that the home position sensor 21 is turned on by being arranged on the back side of the base frame 9. It is configured to turn off.

At a position opposite to the alignment rod 19, a reference rod 22 is installed so as to penetrate a notch portion A formed in the bin tray b. The reference rod 22 extends in the sheet discharge direction, fits with a guide rail 23 supported below the non-sort tray 10, and has one end fixed to a belt 24 stretched in parallel with the guide rail 23. The belt 2
4, one of which is hung on a pulley 26 of a pulse motor 25 fixed below the non-sort tray 10 and the other of which is hung on an idler pulley 27.
As shown in FIG. 3, the reference rod 22 is retracted to the outside of the bin tray area (back of the stopper b ') (home position).
It is possible to move to P ₁ and a position P ₂ that acts when aligning and extruding the sheet. The position detection at P ₁ is performed by the sensor S ₁ , and the position detection at P ₂ is performed by inputting a predetermined number of pulses to the pulse motor 25. Further, the guide rail 23 is attached in a substantially oblique direction so that the home position P ₁ and the position P ₂ have a step difference of a small amount K in the horizontal direction (the position P ₁ is the front side). Further, in the sheet discharge direction, in order to improve the transmission efficiency when the reference rod 22 presses and moves the sheet on the bin tray b, the movement direction of the reference rod 22 is fixed so as to be substantially parallel to the inclination angle of the bin tray b. (See FIG. 2).

The image forming apparatus 200 and the sorting apparatus 100 shown in FIG. 1 are provided with a control circuit CPU, which controls and communicates each operation.

Next, the operation of the above-mentioned configuration will be described below with reference to the flowchart (FIG. 12).

(Step 1) First, the operator places the document D on the document placing table 3 of the automatic document feeder 200 shown in FIG.
Place on 03. Next, after inputting the number of copies n, staple mode (presence / absence), etc. on an operation panel (not shown) of the image forming apparatus, the start key is turned on.

(Step 2) Subsequently, the number of originals D is controlled by the automatic document feeder 200 by idling the originals, or by inputting a numerical value by an operator if known in advance. The circuit is made to recognize the number of originals N ₁ .

(Step 3) The control circuit determines the number N ₂ of copies to be accommodated in one bin based on the set number n of copies. For example, since the number of bin trays in this embodiment is 20, {N ₂ = 1 when n = 0 to 20} {n = 21 to 4}
When 0, N ₂ = 2} {When n = 41 to 60, N ₃ = 3}
… Will be. The number of sheets that can be stored in one bin tray is N ₃ (experimentally obtained in advance and input to the control circuit),
The judgment of N ₁ × N ₂ <N ₃ is performed.

(Step 4) If the determination in (Step 3) is "No", the number of sheets stored in one bin tray exceeds the storable number, so some method (warning sound, display message, etc.) is used. Tell the operator.

(Step 5) If the determination in (Step 3) is "yes", as shown in FIG. 5, the reference rod 22 waiting at the home position is aligned with the position P ₂ which is the reference position for alignment. The rods 19 move to positions 19a that match the size of the discharged sheet.

(Steps 6 and 7) When the above preparation is completed, the sheets discharged from the image forming apparatus 200 are sorted. Here, when the set number of copies n is larger than the number of bin trays (20), 20 sets are sorted first, and when the number of bins is 20 or less, n sets are sorted, and the automatic document feeder 300.
Is fed from the final page onto the platen glass 208 of the image forming apparatus 200 through the path 301 by separating the document bundle D downward (FIG. 1), and after the documents are stopped, an optical system (not shown) is activated to start image formation. To do. Transferring and fixing the already sheet is discharged through the sorting path 6a to the first sheet of the bin tray b ₁ (waiting at a position opposed to the discharge roller) (see FIG. 6). The sheets discharged to the bin tray b ₁ are
The stopper b'moves on the bin tray arranged to be inclined downwards by its own weight toward the stopper b '(two-dot chain line state).

Then, the pulse motor 17 that rotates based on the pulse signal corresponding to the sheet size is used to move the pulse motor to the above-mentioned 19
The aligning rod 19 located at a starts to move by a predetermined amount in the direction of the arrow, and after the sheet side end abuts to the first sheet position where the other side end abuts the reference rod 22 (19).
b). Then, the aligning rod 19 returns to 19a in preparation for the ejection of the next sheet.

The above is the flow of stacking one sheet on the bin tray. After that, by rotating the spiral cam 4, each bin tray is aligned with the position of the discharge roller pair, and the transfer sheet of the final page of the original is placed on the desired bin tray. The end is the reference rod 22,
The rear end is brought into contact with the stopper b ′ to be aligned.

When the transfer of the last page of the original is completed,
The original document on the platen glass 208 passes through the path 302 and is discharged to the uppermost surface of the original document stack D on the original document table 303. However, a partition lever is interposed between the copied document and the uncopied document (not shown), and the two are distinguished.

The above operation is repeated for the number of originals to align and stack desired copy sheets. At this time, the automatic document feeder 300 completes the circulation of the document stack D, and the document stack D is returned to 1 again.
The page is on the top.

(Step 8) Here, the (Step
If the setting mode in p1) is stipple, the process proceeds to (Step 9), and if there is no stipple, the process proceeds to (Step 11).

(Steps 9 and 10) As shown in FIG. 6, the stapler 7 waiting at the home position 7a.
Receives an operation start signal from the control circuit CPU, moves to the stipple operation position 7b (position indicated by a broken line), and strikes the trailing edge corner of the sheet. At this time, the sheet is the reference rod 22 and the alignment rod 1
The side end is held by 9, and it is prevented by bundling at the time of needle driving. After finishing stapling, the stapler 7 returns to the home position 7a, one rotation of the spiral cam 4 moves the bin tray one step, and shifts to staple binding of sheets on the next bin tray.

By repeating the above operation, the staple binding of all the sheet bundles is completed.

(Step 11) Next, as shown in FIG. 7, the reference rod 22 that was in contact with the side edge of the sheet at the alignment reference position P ₂ is moved to the home position P ₁ by the pulse motor 25. As described above, since the movement trajectory of the reference rod 22 is in the direction (step K) away from the sheet bundle side end, there is no bundle deviation due to the movement.

(Step 12) Subsequently, the matching rod 1
9 is driven by the pulse motor 17 to move from the alignment position 19b by a predetermined amount L ₁ (L ₁ > K) (19C). Along with the movement of the aligning rod 19, the sheet is pressed at its side end and pushed out L ₁ toward the front side along the stopper b ′ (second
Seat position).

(Step 13) The above (Step 1)
The reference rod 22 retracted to the position P ₁ in 1) returns to the position P ₂ while pushing up the rear end of the sheet. The sheet has the rear end on the reference rod 22 and the stopper b ',
As shown in FIG. 8, the side ends are supported by the alignment rod 19 and the position is converted into an inclined shape on the bin tray (third sheet position).

(Step 14) Further, in this state, as shown in FIG. 9, the aligning rod 19 is moved by a predetermined amount L _{2 in} the arrow direction (19d). Front cover 3 of the sorting apparatus 100
A space sufficient for the sheet to pass through is provided between 0 and 31, and the sheet side end portion is completely pushed out of the machine by the movement of L ₂ of the alignment rod 19 (the fourth sheet position). ). Since the aligning rod 19 and the reference rod 22 are formed so as to penetrate all the bin trays, the sheets on all the bin trays are pushed out to the front side by avoiding the spiral cam 4, the stapler 7, the cover, etc. owned by the machine by the above operation. Be done.

(Step 15) Here, (Step
If the sorting of the set number of copies n in p1) is completed, the operation of the apparatus is terminated. On the other hand, when there are remaining copies to be sorted, the operations up to (Steps 5 to 14) are repeated.

The case where a plurality of sheet bundles are stacked on one bin tray will be described below.

As shown in FIG. 10, in accordance with the same operation as described above, the second set of sheets in the bin is the first set of sheets in the bin at the fourth sheet position which is placed in an inclined manner on the bin tray. It is loaded by receiving the matching operation above.

After the sort is completed, when the setting mode is "yes", the non-overlap portion between the fourth sheet position (first copy in bin) and the first sheet position (second copy in bin) is set to the stapler. Since 7 is stapling, only the sheet corresponding to the first sheet position (the second copy in the bin) is stapled.

After that, as in (Step 11), the reference rod 22 moves to the home position P ₁ , but the rear end corner of the first bundle of sheets in the bin is the end portion 30 of the cover 30.
It is held by a and does not lose its inclined posture (Fig. 1
1). Subsequently, the second sheet in the bin is pushed out to the fourth sheet position by the operation of (Steps 12 to 14). The operations for the third and subsequent copies stored in the bin are the same as above, and a plurality of copy bundles of sheets are sorted and stacked by staple binding on one bin tray.

On the other hand, when the setting mode is the staple "none", the pushing amount of the alignment rod 19 to the fourth sheet position is L in the first copy in the bin in (Step 14).
₂ , while the second copy in the bin is (L ₂ −Δl ₂ ),
By setting the third set in the bin as (L ₂ −2 × Δl ₂ ) ..., a plurality of sheet bundles can be spatially sorted on one bin tray with an offset amount Δl ₂ (2 in FIG. 12).
Dashed line). It should be noted that the space division based on the offset amount Δl ₂ may be used as a method of positively sorting even in the staple mode.

If the apparatus is used for the purpose of space-dividing two or more sheet bundles on one bin tray as described above, a part of the sheets corresponding to the fourth sheet position is not necessarily machined. It doesn't matter if it doesn't stick out.

Next, conversion of the sheet bundle transfer speed, which is a characteristic part of the present invention, will be described.

FIG. 13 is a block diagram showing the relationship between the copying condition detecting means of the present invention and the sheet transfer motor.

In this embodiment, the sheet number counter 209 is provided in the image forming apparatus 200, and the sheet number counter 209 counts the number of sheets copied by the image forming apparatus 200 and sends a sheet number signal to the main body CPU. To send. The main body CPU sends the above-mentioned number signal to the sorter CPU, and the sorter CPU sends a signal for designating the motor drive frequency to the reference rod drive motor driver 49 and the alignment motor driver 47. The reference rod drive motor driver 49 and the matching motor driver 47 that have received the above signals rotate the reference rod drive motor 25 and the matching motor 17 at the drive frequency corresponding to the above signals.

Therefore, in this embodiment, the sheet transfer speed can be changed via the arithmetic circuit and the motor rotation speed conversion circuit means in accordance with the number of sheets copied, that is, the number of stacked sheets.

In the present embodiment, the interval L between the bins b is set so that when 100 sheets of plain paper are loaded in one bin, the bins are almost fully loaded. Therefore, the sliding resistance between the sheet and the bin increases with the increase in the sheet weight as the number of stacked sheets increases. When the number of sheets approaches 100, the sliding resistance between the back surface of the bin above the one bin and the top paper on the bin is added. It grows as much as

FIG. 14 is a diagram obtained by an experiment showing the relationship between the number of loaded sheets per bin, the sliding resistance between the bin and the sheet bundle, and the optimum transfer speed that does not have the adverse effect.

In this embodiment, the sheet bundle is transferred by the aligning rod and the reference rod in accordance with the relationship between the number of sheets per bin in FIG. 14 and the transfer speed. Therefore, in the conventional example, the transfer speed of the sheet bundle is 260 from a small number to a large number of sheets.
While it was constant at about mm / sec, in the present embodiment, the transfer speed can be greatly increased, and the productivity can be improved. In addition, when the number of sheets is small, the transport speed is slightly reduced, so that it is possible to eliminate the unevenness caused by the sheets jumping too much and provide the user with soft and smooth movement.

(Other Embodiment) Second Embodiment Referring to FIG. 1 and FIG.
An example will be described. Description will be omitted by omitting the portions that overlap with those of the previous embodiment. Reference numeral 210 denotes a non-contact type paper thickness detection sensor provided in the sorter body, which can measure a sheet having a thickness of about 50 μ to 300 μ.

FIG. 15 shows a paper thickness parameter added to that of FIG. The sliding resistance increases as the paper thickness increases. In this embodiment, FIG.
As shown in FIG. 3, three types of tables are provided, and the transfer speed of the sheet bundle can be changed according to the sheet thickness determined by the paper thickness detection sensor 210 according to the block diagram of FIG. By adopting this configuration, the same effect as in the previous embodiment can be obtained, and it becomes possible to cope with a sheet bundle having a different paper thickness.

A third embodiment will be described with reference to FIGS. 13 and 16.

In this embodiment, the image forming apparatus 200
A sheet size detection device for detecting the sheet size to be copied is provided therein, and the sheet bundle is transferred according to the sheet size detected by the sheet size detection device according to the block diagram of FIG. 13 as in the previous embodiment. The speed can be changed.

FIG. 16 is based on an experiment, and a sheet size parameter is added to FIG. The sliding resistance value increases as the paper size increases. In this embodiment, by changing the transfer speed of the sheet bundle according to the table of FIG. 16 according to the sheet size detected by the sheet size detection means, the same effect as that of the first embodiment can be obtained. It is now possible to handle sheet bundles of different sizes.

A fourth embodiment will be described with reference to FIGS. 13 and 17. Reference numeral 42 denotes a special paper selection device provided in the image forming apparatus 200, which allows the user to select special paper such as label paper and OHP sheet from an operation unit (not shown). When the user selects special paper from the operation unit, the transfer speed of the sheet bundle can be changed according to the special paper selected according to the block diagram of FIG. 13 as in the previous embodiment.

FIG. 17 is based on an experiment, and the parameters of special paper are added to FIG. In the present embodiment, by changing the transfer speed of the sheet bundle according to the table of FIG. 17 according to the special paper selected by the special paper selection device, the same effect as in the first embodiment can be obtained. It is now possible to handle a bundle of special paper sheets.

A fifth embodiment will be described with reference to FIGS. Reference numeral 45 denotes a staple binding selection device provided in the image forming apparatus 200. When the user selects the staple binding mode from an operation unit (not shown), the sheet bundle is transferred to the staple binding mode according to the block diagram of FIG. The speed can be changed. FIG. 18 is based on an experiment, and a parameter for presence / absence of staple binding is added to FIG. 14. The staple-stitched sheet bundle does not loosen as compared with the unstitched sheet bundle, and therefore the transfer speed can be increased by about 10%. In this embodiment,
When the staple binding mode is selected by the staple binding selection device,
By changing the transfer speed of the sheet bundle according to the table of FIG. 18, the same effect as that of the first embodiment can be obtained.
It is now possible to handle stapled sheet bundles.

The sixth embodiment will be described with reference to FIGS. 13, 19 and 20. Reference numeral 44 denotes a temperature / humidity sensor provided in the image forming apparatus 200.
It is possible to discriminate between three environments, a low humidity environment "I", a normal temperature / normal humidity environment "II", and a high temperature / high humidity environment "III".
In the present embodiment, the transfer speed of the sheet bundle can be changed according to the environmental condition detected by the temperature / humidity sensor 44 according to the block diagram of FIG. FIG. 19 is based on an experiment and is obtained by adding parameters of environmental conditions to FIG.

In the low temperature and low humidity environment "I", the amount of water contained in the sheet decreases, the stiffness of the sheet becomes stronger, and the upper surface of the sheet is heated by the fixing roller of the main body.
Since moisture evaporates and the sheet shrinks, an upper curl occurs and the sheet becomes bulky, so that the sliding resistance of the sheet bundle increases. Also, in the high temperature and high humidity environment "III",
Since the amount of water contained in the sheet increases, the stiffness of the sheet becomes weaker, and on the inclined bin as shown in FIG. 21, since the sheet is bulky loaded under the weight of the sheet, Sliding resistance increases. In this embodiment, the same effect as in the first embodiment can be obtained by changing the transfer speed of the sheet bundle according to the table of FIG. 19 according to the environmental conditions detected by the temperature and humidity sensor 44. Moreover, it has become possible to cope with changes in environmental conditions.

[0061]

As described above, according to the sheet post-processing apparatus of the present invention, the number of stacked sheets, size, thickness,
Depending on the copy condition such as paper type, staple binding, environmental conditions, etc.,
Since the transfer speed of the sheet bundle is changed to an optimum value, it is possible to efficiently improve the productivity without causing damage to the sheet bundle, noise, etc. when transferring the sheet bundle, and improve the reliability of the sheet bundle transfer. You can

[Brief description of drawings]

FIG. 1 is a front sectional view of a copying machine including a sorter to which the present invention is applied.

FIG. 2 is an enlarged front sectional view of the sorter shown in FIG.

FIG. 3 is a plan view in which some members of the sorter of FIG. 2 are omitted.

4 is a perspective view in which some members of the sorter of FIG. 2 are omitted.

5 is an operation explanatory view of the sorter shown in FIG.

FIG. 6 is an operation explanatory diagram of the sorter shown in FIG. 3;

FIG. 7 is an operation explanatory diagram of the sorter shown in FIG. 3;

FIG. 8 is an operation explanatory diagram of the sorter shown in FIG. 3;

9 is an operation explanatory diagram of the sorter shown in FIG. 3;

10 is an operation explanatory view (second copy) of the sorter shown in FIG.

FIG. 11 is an operation explanatory diagram of the sorter shown in FIG. 3;

FIG. 12 is a flowchart.

FIG. 13 is a block diagram.

FIG. 14 is a correlation diagram of the number of loaded sheets, the transfer speed, and the sliding resistance.

15 is a correlation diagram obtained by adding a parameter based on a difference in paper thickness to the correlation diagram of FIG.

16 is a correlation diagram in which a parameter based on a difference in paper size is added to the correlation diagram of FIG.

17 is a correlation diagram obtained by adding special paper parameters to the correlation diagram of FIG.

FIG. 18 is a correlation diagram obtained by adding a parameter for presence / absence of staple binding to the correlation diagram of FIG. 14.

19 is a correlation diagram obtained by adding a parameter of a difference in environmental conditions to the correlation diagram of FIG.

FIG. 20 is a diagram showing the environment classification of FIG.

FIG. 21 is a front view of the bin tray showing a stacking state of sheets under the environmental condition [I] in FIG.

FIG. 22A is a front view showing the state of the bin tray when a large number of sheets are loaded and FIG.

Claims (3)

[Claims] 1. At least one bin for accommodating discharged sheets, a sheet transfer means for moving a sheet bundle on the bin, and a control means for controlling the movement of the sheet transfer means. In the sheet post-processing device, the transfer speed of the sheet transfer means is made variable according to the condition information such as the number and type of discharged sheets, the type of post-processing or the environment. A sheet post-processing apparatus including. 2. The condition information is the number of sheets to be stored in a bottle, paper thickness, selection of special paper, presence / absence of staple binding selection, sheet size, or temperature / humidity. A sheet post-processing device including the sheet bundle transfer device according to item 1. 3. An image forming apparatus comprising the sheet post-processing apparatus according to claim 1 or 2.