JP3490151B2 - Paper post-processing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to move a group of bins arranged vertically in a multi-stage manner in the vertical direction.
The present invention relates to a sheet post-processing device that selectively ejects a sheet into one of a bin group.

[0002]

2. Description of the Related Art Generally, the height of sheets discharged from an image forming apparatus such as a copying machine is constant, and as a method of sorting sheets discharged one after another from such an image forming apparatus,
A method is known in which a group of bins arranged in multiple stages in the up-down direction is integrally moved in the up-down direction. In such a device, when aligning the width direction of the paper discharged on the bin with the jogger bar, the paper discharged obliquely upward on the bin returns to the rear end of the bin due to its own weight. If the jogger is not performed later, the sheets will be slanted and the alignment accuracy will deteriorate, so the jogger is performed at the timing after the sheets have dropped to the rear end of the bin.

Further, in such a bin moving type apparatus,
In order to reduce the size, the space between the bin from which the paper is ejected and the bin other than the bin above the bin is narrowed. Therefore, if the bin is not moved after the jogger operation is completed, the alignment accuracy deteriorates. However, in actuality, the bin is moved during the jogger operation in order to support a high-speed CPM (Copy Per Minute) copying machine. There is.

Here, the motor for moving the bin normally drives the bin at the same speed during ascent and descent without controlling the speed in order to reduce the cost. Therefore, the load at the time of ascent is increased. The movement speed differs depending on whether the load is large or the load when descending is small. Therefore, high-speed CP
In order to correspond to M, the movement timing is determined on the basis of the rising time when the movement time is long.

FIG. 2 (a) shows the rising timing,
The time a indicates the time until the trailing edge of the sheet returns to the trailing edge of the bin after returning from the discharge sensor by its own weight,
After the elapse of this time a, the jogger bar starts moving to align the width direction of the paper. Then, during the jogger operation, after the trailing edge of the sheet has passed the ejection sensor, the bin starts to rise after a lapse of time t ₁ . Here, the time b from the completion of the jogger operation to the stop of the rising of the bin is the time required to maintain the alignment accuracy.

[0006]

However, in the above method, the movement timing is determined on the basis of the ascending time when the moving time is long, so that the jogger accuracy is deteriorated when the moving time at the descending time is short. There is a point. If the movement timing is determined with reference to the time of descending in order to improve the accuracy of the jogger at the time of descending, it is not possible to deal with high-speed CPM.

FIG. 2B shows the conventional descending timing. Even if the bin starts descending after the same time t _{1 as in} the ascending, the moving time during descending is shorter than that during ascending.
The time b from the completion of the jogger operation to the stop of the descent of the bottle becomes shorter.

By the way, in Japanese Patent Laid-Open No. 4-32460, a device for selectively ejecting a sheet into one of the bin groups by moving the bin group integrally in the vertical direction without performing the jogger as in the present application. In the above, the paper starts to move before the paper falls to the rear end of the bin, and the paper is moved up and down depending on the difference in the slip distance (glide time) of the paper during the ascent and descent of the bin. A method of providing a difference in the movement start timing has been proposed.

However, this conventional method is a method of starting the movement of the bin before the paper drops to the rear end of the bin, and starts the jogger after the paper drops to the rear end of the bin as in the present application. , It cannot be applied to the device that starts moving the bottle during the jogger operation.

In view of the above conventional problems, the present invention provides a high speed C
An object of the present invention is to provide a sheet post-processing apparatus that can deal with PM and can improve the jogger accuracy when the bin is lowered.

[0011]

In order to achieve the above-mentioned object, a first means integrally drives a group of bins vertically arranged in multiple stages in the vertical direction and moves at a rising speed and a lowering speed. In a sheet post-processing apparatus including a bin driving unit for varying the degree and a aligning unit for aligning the width direction of the paper on the bin, the paper is discharged onto the bin. The aligning means starts to move after falling down to the rear end of the bin, and the moving means controls the bin to start moving at different timings when the bin moves up and down. Is characterized by.

A second means is characterized in that, in the first means, the control means controls such that the movement start timing at the time of descending is delayed from that at the time of ascending.

In the third means, the difference in the movement start timing between the rising and the falling in the first or the second means is the difference in the moving time according to the load of the bin driving means during the rising and the falling. It is characterized by being.

[0014]

In the first means, the aligning means starts moving after the sheets are discharged onto the bin and dropped to the rear end of the bin by the control means, and the timing is different at the time of ascent and descent of the bin during the movement. Since the bin is controlled so as to start moving, it is possible to cope with high-speed CPM and improve the jogger accuracy when the bin is descending.

In the second means, since the movement start timing at the time of descending is later than that at the time of ascending, it is possible to cope with high-speed CPM and improve the jogger accuracy when the bin is descending.

In the third means, since the difference between the movement start timings during the ascending and descending is the difference in the moving time depending on the load of the bin driving means during the ascending and descending, it is possible to move during the ascending and descending. When the time is different, it is possible to cope with high-speed CPM and improve the jogger accuracy when the bin is descending.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a sheet post-processing apparatus according to the present invention, and FIG. 2 is a timing chart comparing the bin movement timings of the sheet post-processing apparatus shown in FIG. 1 and a conventional example.

Paper P discharged from a copying machine (not shown) in FIG. 1 is detected by a discharge sensor 1, and then a plurality of bins 3 (31, 32 to 3n) are formed by a pair of conveying rollers 2.
Selectively discharged to one of the The bottles 3 are arranged obliquely so that the tip end side (downstream side in the discharge direction) becomes higher, and a stopper 3a is provided upright on the rear end side. This stopper 3a
The sheet P that has been discharged diagonally upwards over the upper side of the bin 3 returns due to its own weight, and the rear end contacts the stopper 3a so that the longitudinal direction (conveying direction) is aligned. The bin group 3 is integrally driven in the vertical direction by the motor M1 and at the same speed during rising and lowering, but the moving speed is different because the load is different during rising and lowering.

Further, the jogger bar 4 can be moved in the width direction of the paper P by the motor M2 with respect to each bin 3. The control unit 5 controls the motor M1 as shown in FIGS. 2A and 2C based on the command from the copying machine and the detection signal of the discharge sensor 1 to move the bin group 3 in the vertical direction, By controlling M2, the jogger bar 4 is moved to align the width direction of the paper P.

First, in this embodiment, when the bin 3 is raised, the discharge sensor 1 detects the trailing edge of the sheet P as shown in FIG. The movement of the jogger rod 4 is started after a lapse of time a after dropping to the stopper 3a). Next, while the jogger bar 4 is moving, that is, after the paper P has dropped to the rear end of the bin, and after the ejection sensor 1 detects the rear end of the paper P, a relatively short time t ₁ elapses and then the bin group 3 Start moving.

Therefore, even if the bin group 3 is driven at the same speed during ascent and descent, the load is large at the time of ascent and the ascent time is long, so that the alignment accuracy from the completion of the jogger operation to the stop of the ascent of the bin is maintained. It is possible to secure the time b required for the long time.

On the other hand, when the bin 3 is lowered, as shown in FIG. 2 (c), first, the ejection sensor 1 moves the paper P as in the case of raising.
After the trailing edge of the paper P is detected, the jogger rod 4 is moved after a lapse of time a until the paper P returns to its trailing edge due to its own weight.
To start moving. Then, the discharge sensor 1 at the time of this lowering a moving of jogger rod 4 after detecting the trailing edge of the sheet P, and starts moving bins 3 after a lapse of a relatively long time t _2.

Therefore, even if the bin group 3 is driven at the same speed during the ascent and descent, the load is small during the descent, and even if the descent time is short, the alignment accuracy from the completion of the jogger operation to the stop of the descent of the bin is maintained. It is possible to secure the time b required for the long time.

Here, when the movement of the bin group 3 is started after the elapse of a relatively long time t ₂ even when the bottle group 3 is moved up, as shown in FIG.
As shown in (d), the time b can be secured long, but if the completion of the movement of the bin is delayed, the next sheet cannot be received, so that high-speed CPM cannot be supported. Therefore, at the time of ascending, the movement of the bin group 3 is started after a relatively short time t ₁ has elapsed, so that high-speed CPM can be achieved.
Can correspond to. Further, the difference between the times t ₁ and t ₂ can be set to the load of the bin group 3 or the like, that is, the difference between the moving time at the time of rising and that at the time of falling, so that high-speed CPM can be dealt with and the jogger accuracy at the time of descending the bin is high. Can be improved.

[0025]

As described above, according to the first aspect of the present invention, the aligning means starts moving after the paper is discharged onto the bin and drops to the rear end of the bin, and the bin is raised during the movement. Since the bin starts moving at different timings when the bottle is lowered and when the bottle is lowered, it is possible to cope with high-speed CPM and improve the jogger accuracy when the bottle is lowered.

According to the second aspect of the present invention, since the movement start timing at the time of descending is later than that at the time of ascending, it is possible to cope with high-speed CPM and improve the jogger accuracy when the bin is descending.

According to the third aspect of the present invention, the difference between the movement start timings during the ascending and descending is the difference in the moving time according to the load of the bin driving means during the ascending and descending. It is possible to cope with high-speed CPM when the moving time is different from time to time and improve the jogger accuracy when the bin is lowered.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a sheet post-processing apparatus according to the present invention.

FIG. 2 is a timing chart in which the sheet post-processing apparatus shown in FIG. 1 and a conventional example of bin movement timing are compared.

[Explanation of symbols]

1 Emission sensor 3 bottles 3a stopper 4 Jogger stick 5 control unit M1, M2 motor

─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Nobuyuki Morii 2-28-24 Izumi, Higashi-ku, Nagoya-shi, Aichi Yokota Ricoh Elemex Co., Ltd. (72) Inventor Yuichi Fujii 2-28 Izumi, Higashi-ku, Nagoya-shi, Aichi 24 Yokota Building, Ricoh Elemex Co., Ltd. (56) Reference JP-A-4-140271 (JP, A) JP-A-5-155175 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) B65H 39/11

Claims (3)

(57) [Claims] 1. A group of bins vertically arranged in multiple stages are integrally driven in the vertical direction, and the moving speed is increased and decreased.
In a sheet post-processing apparatus that includes a bin driving unit that varies the width of the sheets on the bin and an aligning unit that aligns the sheets in the width direction by moving the sheets in the bin width direction, The sheet post-processing apparatus is provided with a control means for starting the movement of the aligning means after it has dropped, and for controlling the start of the movement of the bin at different timings when the bin moves up and down during the movement. 2. The sheet post-processing apparatus according to claim 1, wherein the control unit controls the movement start timing of the bin group at the time of descending to be later than that at the time of ascending. 3. The difference in the movement start timing of the bin group during the ascending and descending is the difference in the moving time according to the load of the bin driving means during the ascending and descending. Alternatively, the sheet post-processing device according to item 2.