JPH0610065B2 - Sheet accumulator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a sheet stacking device for stacking conveyed sheets of paper, film, metal plate or the like.

(Prior Art) One of the devices for stacking and accumulating sheets conveyed one by one, a front stopper provided in front of the sheet in the sheet conveying direction receives the front end of the conveyed sheet and sets the sheet at the front end. It is known to collect while aligning.

It is desirable that the front stopper of the device for performing such stacking is, for example, a stopper plate that receives the front end of the sheet and is movably supported by a spring or a damper. As an example of such a structure, there can be mentioned, for example, a device which elastically supports the entire stopper plate with a spring or the like in the sheet conveying direction as shown in Japanese Utility Model Laid-Open No. 54-76077.

In this way, by making the front stopper that receives the front edge of the sheet movable, and providing a cushioning action, the sheet is conveyed and loaded into the stacking device, and the impact when it collides with the front stopper is absorbed, and the buckling of the sheet occurs. Thus, it is possible to prevent breakage and the like. In addition, the stopper conditions of the front stopper, particularly the elastic coefficient of the spring, the damping coefficient of the damper, and the buffer conditions such as the movable weight of the stopper are adjusted according to the conditions of the conveyed sheet, for example, the sheet condition such as the weight of the sheet and the conveying speed. The sheet stacking effect can be further enhanced and the front end alignment accuracy of the sheets can be increased by adjusting the sheet thickness appropriately.

(Problems to be Solved by the Invention) By the way, in the conventional sheet stacking apparatus having such a front stopper, one front stopper set to one stopper condition is installed in one apparatus.

However, for example, various conditions (sheet conditions) relating to a sheet to be conveyed, such as different types of sheets being conveyed, or different sheet conveying speeds even if the types of sheets are the same, for example, When thickness, weight, size, conveyance speed (speed at which a sheet collides with a stopper), etc. are different, one front stopper set for one stopper condition receives all the sheets with different sheet conditions and appropriately impacts It becomes difficult to absorb and accumulate. For example, if a sheet with a small weight and a small thickness is put into an accumulating device in which a front stopper is installed according to the conditions of a sheet with a large thickness and a large thickness, the sheet will be folded. Also, when a heavy and thick sheet is put into a stacking device equipped with a front stopper that matches the conditions of a small sheet with a small weight and a thin sheet, the front stopper cannot completely absorb the impact, and the guide ability is insufficient. The alignment accuracy of the front edge of the seat deteriorates. Therefore,
In order to properly accumulate such sheets with different sheet conditions, work to stop the line and replace the front stopper,
It was very inconvenient because it needed to be readjusted.

In view of the above circumstances, an object of the present invention is to provide a sheet stacking apparatus capable of appropriately stacking sheets having different sheet conditions without stopping the line and adjusting or replacing the stopper. The purpose is.

(Means for Solving the Problems) In order to solve the above problems, the sheet stacking apparatus according to the present invention receives the front end of the conveyed sheet by a front stopper provided in the front in the sheet conveying direction. In a sheet stacking apparatus for stacking sheets while aligning their front end positions, a plurality of front stoppers having different stopper conditions such as movable part weight, elastic coefficient, damping coefficient, etc. An optimum stopper is selected from the plurality of stoppers on the basis of sheet conditions such as a stopper device having a stopper changing means for receiving a front end of the sheet and a weight of a sheet to be conveyed, a conveying speed, and the like. Stopper replacement means control for operating the stopper replacement means so as to position the front end of the sheet And a device.

(Effect of the Invention) The sheet stacking apparatus according to the present invention has a plurality of front stoppers having different stopper conditions, and is provided with a stopper replacing means for replacing the front stoppers according to the sheet conditions. Since it is configured to be driven by the replacement means control device, the optimum moving part weight, elastic coefficient, damping coefficient, or other stopper conditions can be set according to the sheet conditions such as the weight of the sheet to be loaded, the plate thickness, and other loading speeds. The front stopper that it has is selected by the stopper replacement means control device, and this optimum front stopper is installed at a position that receives the front end of the sheet.

Therefore, the front stopper can surely absorb the impact at the time of inserting the sheet, and it is possible to prevent the sheet from being folded and the sheet being misaligned due to the non-adaptation of the stopper condition and the sheet condition.

Also, since it is possible to automatically and instantly switch to the optimum stopper that adapts to the sheet conditions, for example, even if the weight of continuously loaded sheets and the transport speed are different, Optimal stoppers can be automatically and instantly placed to receive the sheet, there is no need to stop the line to adjust or replace the stopper as in the past, and work rationality is greatly improved. This allows effective stacking of sheets.

(Example) An example of a sheet stacking apparatus according to the present invention will be described below with reference to the drawings.

1 and 2 are a plan view and a side view of an embodiment of a sheet stacking apparatus according to the present invention.

The illustrated embodiment comprises three types of front stoppers 4A, 4B and 4C having different stopper conditions.

Sheet 2 conveyed in the direction of arrow A by the conveyer 1
Is a front stopper 4A positioned at a position for receiving the front edge of the sheet 2 among the above three types of front stoppers.
It is received by and is guided by the front stopper 4A and the rear stopper 3 provided so as to face the front stopper 4A, and falls downward to be accumulated.

Each of the front stoppers 4A, 4B, 4C has a stopper plate 5
A, 5B and 5C, guide bars 6A, 6B and 6C fixed to the respective stopper plates, and side bars 8A, 8B and 8C which slidably support the respective guide bars in the axial direction,
The coil springs 7A, 7B and 7C elastically support the stopper plates with respect to the side bars.

The front stoppers 4A, 4B and 4C have different stopper conditions. Here, the stopper condition is a condition that affects the stopper function, and mainly determines the weight of the movable portion such as the stopper plate and the guide bar, the elastic coefficient of the coil spring, and the buffer capacity such as the shape and material of the stopper plate. The condition to do. In the illustrated embodiment, a coil spring is used to provide a cushioning effect, but instead of this or in addition to this, a damper or the like having an impact force damping effect may be used. Also becomes a stopper condition. Of course, even if the stopper conditions are made different, it is not always necessary that all the stopper conditions be made different, and only some of them may be made different.

In the illustrated embodiment, the front stoppers 4A, 4
B and 4C are each set to the same stopper condition, and are composed of two stoppers arranged side by side in the width direction of the sheet 2 (direction of arrow B).

The above-mentioned three types of front stoppers 4A, 4B, 4C are attached to stopper replacement means 40 for locating each of them at the sheet front edge receiving position, and these front stoppers and stopper replacement means constitute a stopper device 41.

This stopper replacement means 40 is provided with front stoppers 4A, 4B, 4
C are arranged at equal angular intervals on the support block 11 via the connecting plates 9A, 9B, 9C, the support block 11 is connected to the rotary shaft 10, and the index drive device 12 is connected to the rotary shaft 10. , This index drive
By rotating the rotating shaft 10 by a predetermined angle by means of 12, an arbitrary front stopper can be positioned at the seat front edge receiving position.

The stopper replacement means 40 is connected to the stopper replacement means control device 42. The control device 42 controls three types of front stoppers 4 based on the sheet condition of the conveyed sheet.
The optimum front stopper for the sheet is selected from among A, 4B, and 4C, and the stopper changing means 40 is operated to position it at the sheet front edge receiving position. In this embodiment, the sheet is conveyed. Sheet condition output means 43 for outputting the sheet condition, and a pre-optimum stopper is selected based on the sheet condition output from the output means 43, for example, by referring to a previously given sheet condition-stopper condition correspondence table. And a control means 44 for outputting a drive signal to the index drive device 12 so as to position the sheet front end edge receiving position.

Therefore, for example, if the front stopper 4C is optimal for the next sheet 2 to be loaded, the rotating shaft 10 rotates 90 degrees in the direction of arrow C so that the front stopper 4C can receive the sheet 2. Is.

Note that the above-mentioned sheet conditions are various conditions related to the sheet such as the thickness, weight, size, material of the sheet, sheet conveying speed, and the like, which affect the optimum stopper condition in the stopper device. .

Further, the stopper device 40 includes the slide guide bar 13,
A slide bearing 14 slidably fitted to the slide guide bar 13, a female screw member 15 fixed to the slide bearing 14, a ball screw 16 screwed to the female screw member, and the ball screw 16 are rotated. By the size switching drive device 17, the arrow D is adjusted according to the length of the sheet.
The structure is such that it can move along the direction and adjust its position.

Next, another embodiment of the present invention will be described.

3 and 4 are a plan view and a side view showing another embodiment.

In this embodiment, the front stoppers 4A and 4B set to two different kinds of stopper conditions are provided, and except that the replacement means 40 of the front stoppers 4A and 4B is different, the other is basically the same. This is the same as the above-described embodiment, and therefore, the same components as those in the above-mentioned embodiment are designated by the same reference numerals and detailed description thereof is omitted.

The front stopper 4A and the front stopper 4B are arranged side by side in a direction perpendicular to the sheet feeding direction (arrow B direction), and are moved in the arrow B direction depending on the condition of the sheet to be loaded for replacement. This replacement is a stopper replacement means consisting of a rodless cylinder 24 that is operated by air pressure.
Performed by 40. The front stoppers 4A and 4B are connected to the rodless cylinder 24 via a connecting plate 9. This rodless cylinder 24 has two pneumatic lines 25
Via a compressed air supply line 27 connected to the air compressor 26 and a three-way electromagnetic switching valve 29 connected to the atmosphere opening line 28.
It is connected to the. The three-way electromagnetic switching valve 29 is connected to the stopper replacement means control device 42 similar to that of the above embodiment. Similar to the above embodiment, the control device 42 selects the optimum stopper according to the condition of the sheet to be put in, switches the switching valve 29 so that it is located at the seat front end receiving position, and switches the rodless cylinder 24 to the arrow. The front stopper is replaced by appropriately moving it in the B direction.

For example, if the sheet condition of the sheet 2 to be next thrown in is suitable for the front stopper 4B, the rodless cylinder 24 is operated by the three-way electromagnetic switching valve 29, and as a result, the front stoppers 4A, 4B move in the direction of arrow B '. Then, the front stopper 4B
Are arranged at the front edge receiving position of the sheet 2.

Also in this embodiment, the stopper device 41 is moved to the arrow D according to the size of the sheet by the size switching drive device 17 or the like.
It is configured so that it can be slid in any direction and installed at an appropriate position.

[Brief description of drawings]

1 is a plan view of an embodiment of the sheet stacking device according to the present invention, FIG. 2 is a side view of the embodiment shown in FIG. 1, and FIG. 3 is a plan view of another embodiment of the sheet stacking device according to the present invention. 4 and 5 are side views of the embodiment shown in FIG. 2 ... Sheets 4A, 4B, 4C ... Front stopper 40 ... Stopper replacement means 41 ... Stopper device 42 ... Stopper replacement means Control device

Claims (1)

[Claims] 1. A sheet stacking apparatus for receiving a front end of a conveyed sheet by a front stopper provided in front of the sheet in the sheet conveying direction and accumulating the sheet while aligning the front end positions thereof. A stopper device having a plurality of front stoppers having different stopper conditions such as a coefficient, and a stopper changing means for arranging any one of the plurality of front stoppers at a position for receiving the front end of the sheet, and a weight of a sheet to be conveyed. , A stopper replacement means for selecting an optimum stopper from the plurality of stoppers on the basis of sheet conditions such as a conveyance speed and for activating the stopper replacement means so as to position the optimum stopper at a position for receiving the front end of the sheet. A sheet stacking apparatus comprising a control device.