JPH04109937U - Stacked sheet feeding device - Google Patents

Abstract

(57) [Summary] [Purpose] To always accurately set the front end position of stacked sheets in a stacked sheet feeding device, improve the quality of printing, cutting, etc., and significantly improve inspection accuracy. [Structure] In a paper feeding device that sequentially transports stacked sheets 8 to a downstream process one by one from the topmost stage side, a movable table 4 that can move back and forth with respect to the traveling direction of the sheets 8 is provided on an elevating table 3. , an air cylinder 6 is provided which is connected to the movable base 4 and controls the movement of the movable base 4 so that the front end of the deformed stacked sheets located on the movable base 4 is at a predetermined position.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is designed to transport the stacked sheets one by one to the downstream process from the top. This system can be applied to the sheet feeding section of sheet-fed printing machines, sheet-fed printing machines, etc. This paper relates to a sheet feeding device.

0002

[Conventional technology]

3 and 4 are explanations of the configuration and functions (disadvantages) of a conventional general sheet feeding device. 3 and 4, the paper feeding device in FIG. 3 and FIG. 8 to the downstream process one by one starting from the top stage.The conventional method is outlined below. The configuration will be explained.

0003 Now, as shown in Fig. 3, this device includes a table 3 for stacking sheets 8, The lowering device 2 detects the height of the top sheet 8a and operates the lifting device 2 for the table 3. a control device 12 for transporting the uppermost sheet 8a, and a transport device 9 for transporting the uppermost sheet 8a to a downstream process, etc. The sheet conveying device 9 sucks one of the uppermost sheets 8a. At the same time as being held by the attaching means 10 and conveyed to the downstream process, the adsorbed sheet is released. and return to the original standby position.

0004 Thereafter, the above operation is repeated sequentially so that the sheets 8 can be carried out one by one. It has become. That is, the table lifting device 2 receives feedback via the control device 12. The height of the top sheet 8a is raised sequentially according to the height detection signal of the top sheet 8a, and the stacking system accompanying the unloading Correct the drop in the upper end position of plate 8. Transport all the sheets 8 stacked in this way. After the lift table 3 is brought out, the lift table 3 is lowered to the lowest position, and the next Place the stack of sheets. The above cycle is then repeated one after another. By the way, there are various means for detecting the upper end of the sheet, such as a limit switch, a phototube, etc. In addition to the chain method shown as an example, there is also a method for lifting and lowering the table. , a method using a motor, an air cylinder, etc. as a driving means.

[0005]

[Problem that the idea aims to solve]

As described above, the conventional paper feeding device uses a tray to correct and control the height of the top sheet 8a. Although the cable 3 is designed to move up and down, it does not have a correction function for the seat longitudinal direction. However, depending on the deformed sheet stacking state as shown in Fig. 4, the front end position of the sheet may be There was a drawback that there was a large amount of variation. Therefore, the relative front and rear positions with respect to the sheet transport means 9 Due to the change in position, the delivery condition to the sheet receiving means is uncertain when transferring to the downstream process. There were some problems, such as the In this way, the variation in the initial delivery position can be It greatly affects the accuracy of positioning in the flow process, and it is not only due to failures in delivery. This can significantly deteriorate the accuracy of printing, cutting, and other sheet inspections, leading to poor product quality. This was the main factor inducing the decline.

[0006] As mentioned above, the elevating table installed in the conventional sheet feeding section simply stacks the sheets. Raise the topmost sheet to correspond to its height relative to the paper feeder, or It only has the function of descending to the position where sheets are refilled, and the sheet stacking condition, that is, the conventional There is no means to correct the front and back position of the deformed stacked sheets on the cable, and the sheets The amount of variation in the direction of movement becomes the amount of variation for the receiving means immediately downstream, and the This was a source of instability at the time. It also causes a decline in printing, cutting processing, and inspection accuracy. It was also a factor.

[0007] The present invention has been proposed to solve the above-mentioned conventional problems.

[0008]

[Means to solve the problem]

Therefore, in this invention, the stacked sheets are sequentially transported one by one from the top to the downstream process. The paper feeding device that outputs the stack of sheets moves up and down to raise and lower the stacked sheets. A movable platform that can be moved back and forth in the direction of sheet movement is installed on the lifting table. , the movable table is moved so that the front end of the deformed stacked sheet located on the movable table is in a predetermined position. It is designed to control the movement of the table, and is used as a means to solve problems. It is something.

[0009]

[Effect]

Controlling the movement of a movable base configured to move back and forth in the direction of travel of the seat. The front edge position of the deformed stacked sheets to be fed is always set at a predetermined position. ) becomes possible. This allows the relative front and back position with the sheet delivery means to be adjusted. This makes the operation (chucking) of the downstream receiving means stable. and this By ensuring reliable sheet transport, problems such as sheet transport errors and tears can be avoided during transport. In addition to eliminating problems, it also improves processing accuracy such as sheet quality inspection, printing, and cutting. As a result, product quality can be significantly improved.

0010

【Example】

The present invention will be explained below with reference to an embodiment of the present invention. FIG. 1 shows an embodiment of the present invention. FIG. 2 is an explanatory diagram of the basic configuration of a stacked sheet feeding device. The paper feeding device in Figure 1 has a device width It has a lifting device 2 consisting of a pair of endless chains 1 that interlock at both ends of the direction. In other words, the lifting table 3 fixed to a part of the chain 1 maintains its horizontal position and moves up and down. It is possible to move. 4 is a movable table on which the sheet is placed; It is supported via guide rails 5a and 5b installed at both ends of the An air pump that is attached to the lifting table 3 and whose front end head is connected to a part of the movable table 4. It is configured so that it can move back and forth in the sheet feeding direction by the expansion and contraction operation of the cylinder 6. It is. In addition, 7 in the figure is a front-back direction by bringing the front end of the stacked sheet 8 into contact with the stacked sheet 8. This is a stopper that regulates the position of. Further, a sheet conveying device 9 is provided at the upper part of the moving table 4. The device 9 uses a suction pad 10 to pick up one sheet 8a in the top row. After holding the sheet by suction, it is transferred in the sheet advancing direction and delivered to the downstream sheet transport means. It is configured to release the suction hold and return to the initial position and wait.

[0011] Next, to explain the operation, the sheets 8 are stacked on the carrier plate 11. Then, it is carried to the movable platform 4 waiting at the lowest position, and is placed at a predetermined position on the movable platform 4. will be placed on. Next, the uppermost sheet 8a is moved by the lifting device 2 until it reaches a predetermined height. Raise the lifting table 3, then push out the air cylinder 6, and remove the deformed stacked sheet. The movable base 4 is moved (advanced) until the front end of the front end 8 comes into contact with the stopper 7. Above The initial settings for the sheets to be exported are completed.

0012 If the sheet conveying device 9 is operated in this state, one sheet of the stacked sheets 8 will be sequentially loaded starting from the top. Each sheet is handed over to the downstream process. Note that the sheet conveying device 9 indicated by a cylinder is This is just one example, and many means are conceivable, such as driving via a link, cam, etc. . In addition, the height fluctuation (lowering) of the top sheet 8a of the stacked sheets 8 due to the unloading is , the correction is made sequentially or stepwise by raising the elevating table 3. By the way, place The pressing force of the stacked sheet 8 against the positioning stopper 7 is equal to the force applied to the air cylinder 6. It can be changed arbitrarily by adjusting the air pressure, and usually the deformed stacking system is The uppermost sheet 8a of the sheet 8 is pressed to the minimum pressing force so that it completely contacts the stopper 7. It's under control. In addition, as a driving means for the movable table 4, the illustrated air A motor is provided in place of the cylinder 6 to control the contact of the uppermost sheet 8a to a predetermined level. By detecting through the detection means and feeding back this detection signal to the motor. There is also a method of driving.

[0013] In addition, the rear end of the air cylinder is placed on the lifting table 3 by a slider that moves in the width direction of the device. The movable base 4 is attached to the slide table and moved back and forth with respect to the slide table. By doing so, the position of the stacked sheets 8 can be corrected in the width direction and the front-back direction. It is also possible to consider a device configured to allow Other methods for driving the lifting table 3 up and down, Other than the chain method shown in the example, direct elevation via a motor or hydraulic cylinder, etc. There are many different formats. Note that these paper feeding devices of the present invention are not compatible with known conventional lifting tables. In addition to the configuration and functions of the table 3, a movable table 4 that moves back and forth with respect to the lifting table 3 is installed. The configuration is such that the front and rear positions of the sheet 8 placed on the movable table 4 can be accurately corrected. The main points are as follows, and are not necessarily limited to the above-mentioned examples. There isn't.

[0014]

[Effect of the idea]

As explained in detail above, according to the present invention, the stacked sheets are sequentially stacked from the top side. In the paper feeding device that transports sheets one by one to the downstream process, the front edge position in the sheet advancing direction is always adjusted. can be set accurately. Therefore, it is difficult to communicate with the sheet delivery means provided above the sheet. The relative position is ensured, thereby stabilizing the delivery to the next process sheet receiving means. This function also contributes to stabilizing the delivery operation in the sequential downstream process. Therefore, it is an important element to eliminate transport problems such as sheet transport errors and tears. Become. In addition, the position of the sheet conveyed in each process can be set accurately. This not only improves the quality of printing, cutting, etc., but also greatly improves the accuracy of inspection equipment. You can improve your performance.

[Brief explanation of drawings]

FIG. 1 is a side view showing the basic configuration of a stacked sheet feeding device according to an embodiment of the present invention.

FIG. 2 is a side view of the same sheet feeding device in a different operating state from FIG. 1;

FIG. 3 is a side view of a conventional stacked sheet feeding device.

FIG. 4 is a side view of the same sheet feeding device in a different operating state from FIG. 3;

[Explanation of symbols]

1 Endless chain 2 Lifting device 3 Elevating table 4 Movable platform 5 Guide rail 6 Air cylinder 7 Stopper 8 sheets 9 Sheet conveyance means (device) 10 Suction pad 11 Carrier plate 12 Control device S Amount of variation in the front and back direction of stacked sheets

Claims (1)

[Scope of utility model registration request] Claim 1: In a paper feeding device that sequentially transports stacked sheets one by one to a downstream process from the topmost stage side, the sheet is placed on an elevating table that moves up and down to raise and lower the stacked sheets in the direction of sheet travel. A stacked sheet is provided with a movable base that can move back and forth against the movable base, and the movement of the movable base is controlled so that the front end of the deformed stacked sheet located on the movable base is in a predetermined position. paper feed device.