JPH0144510Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a sheet-fed printing press paper feeding device that presses the trailing edge of the paper sucked up by the suction device and the stacked paper below from above. This invention relates to a feeding paper holding device that prevents the second sheet of paper from following and being sucked up.

[Conventional technology]

The paper feed device of a sheet-fed printing machine includes a paper stacking table that stacks paper for printing, a first suction port of a suction device that suctions the stacked sheets one by one starting from the upper layer, and a paper feeder that uses the first suction port to The paper is provided with a second suction port that sucks the central part of the paper that has been sucked up and conveys it forward so that it is captured by the upper and lower paper feed rollers. Below the first suction port, there is a nozzle called a blowing foot that blows air between the sheets from behind the paper ends to separate them, and also presses the ends of the paper ends of the stacked papers from above. A paper holding device is provided.

This paper holding device conventionally consists of a plurality of elastic plates called tongues, which are generally made of thin steel plates and are formed in the shape of a tongue, and which are stacked and fixed to a supporting metal fitting while being shifted back and forth. When the first suction port sucks up the first sheet of paper in the upper layer, the paper is deformed elastically by the tail of the paper as if flipping the elastic plate against its elasticity. The elastic plate that has been sucked up and released the first sheet returns elastically and presses the edges of the second and subsequent sheets, thereby separating them from the first sheet.

[Problem that the invention attempts to solve]

However, in such conventional paper holding devices, bending stress is repeatedly applied to the elastic plate by the corners of the support fittings each time the elastic plate repeats elastic deformation tens of thousands of times per hour. They tend to bend or break due to elastic fatigue, requiring replacement after a short period of time, and their lifespans have been further shortened due to the use of thick paper and the speeding up of printing presses in recent years. In addition, damaged elastic plates enter the printing section together with the conveyed paper and damage the blanket on the circumference of the cylinder, resulting in not only wasted paper and the need to replace the blanket, but also damage to the printing cylinder. There was a risk that a major accident could occur.

[Means for solving problems]

In order to solve these problems, in the present invention, multiple elastic plates formed in the shape of tongues made of thin steel plates are stacked one on top of the other, shifted back and forth so that the lower layer recedes. The elastic plate, the buffer plate, and the support plate were integrally fixed by stacking the buffer plates made of the material by shifting them backwards and then stacking the support plates above them by shifting them backwards.

[Effect]

With this structure, even if the elastic plate is repeatedly elastically deformed up and down as the paper is sucked up and the rear end is repelled, elastic fatigue will be avoided because the bent part is in contact with the corner of the support plate via the cushioning material. Less is.

〔Example〕

Figures 1 to 3 show an embodiment of the feeding paper holding device according to the present invention, and Figure 1a is a front view thereof;
FIG. 1b is a plan view of the same, FIG. 2 is a plan view of a printing press paper feeder in which this is implemented, and FIG. 3 is a side view of the main part of FIG. 2 shown for explaining the operation. In the figure, a paper feed device 1 of a printing press is equipped with left and right paper feed frames 2, and from the upper rear end of each paper feed frame 2 there is a pair of left and right feed frames 3 whose rear ends are connected by a horizontal member. The suction frame 3 protrudes rearward, and a suction device, generally designated by reference numeral 4, is supported by the suction frame 3 so as to be movable and adjustable in the front-rear direction and the vertical direction. 5 is a handle for moving the suction device up and down, and 6 is a fixing knob for fixing the suction device positioned in the front-back direction. The suction device 4 includes a plurality of first suction ports 7 that are parallel to each other in the width direction of the machine and are movable vertically, and a plurality of second suction ports 8 that are parallel to each other in the width direction of the machine and are movable vertically and longitudinally. Each suction port 7, 8 is connected to a vacuum pump or the like as an air source. Then, the first suction port 7 receives the paper 10 stacked on the paper stacking table 9 by descending.
The rear end of the paper is sucked one by one starting from the upper layer, and the second suction port 8 moves up by suctioning the central part of the paper sucked by the first suction port 7, and then moves forward to collect the paper 10. The front end is configured to be captured between paper feed rollers 11 and 12 which are rotating and in contact with each other above and below. A plurality of paper feed tapes 16 are stretched between the lower paper feed roller 12 and the rollers 13, 14, and 15 in parallel in the machine width direction, and the paper 10 fed out by the upper and lower paper feed rollers 11, 12 is
This paper feeding tape 16 connects the feeder board 17.
It is fed upwards and ready to be fed to the printing unit.

The paper feeding device 1 roughly configured as described above includes:
The paper pressing device, which is generally designated by the reference numeral 18, is the suction device 4.
It is supported by a support rod 19 protruding from the main body side of the paper and is provided approximately at the center of the width of the paper. This paper pressing device 18 includes a plurality of elastic plates 20 formed in the shape of tongues from thin steel plates.
0's are shifted and stacked so that the ones in the lower layer are pushed back. Below the elastic plate 20, a short support plate 21 is stacked with its front end aligned with the front end of the bottom elastic plate 20, and above the elastic plate 20, a short support plate 21 is made of an elastic material such as rubber. The buffer plates 22 formed in a square shape are stacked so that their front ends are substantially aligned with the front ends of the elastic plates 20 on the bottom layer, with the front ends set back far behind the elastic plates 20 on the top layer, and further above the buffer plates 22. Support plates 23 each having a short rectangular shape and an arcuate lower front end are stacked on top of each other with the front end being shifted rearward from the front end of the buffer plate 22. The support plate 23 and the buffer plate 2 are stacked in order from above.
2. The elastic plate 20 and the support plate 21 are integrally fixed with a set screw 24 and a nut 25. The paper holding device 18 configured in this manner is mounted with the protruding portions of the elastic plate 20 from the support plates 21 and 23 facing above the paper ends of the stacked papers 3. Although not shown, the paper feeder 1 is provided with a blower that blows air onto the upper stacked paper from the edge side.

The operation of the paper feeding device 1 configured as above will be explained. When the paper stack 9 is raised to a predetermined height and printing work begins, the first suction port 7 is lowered and the paper 1
After suctioning the tail of the paper 0, it rises. FIG. 3 shows the state in which the first suction port 7 is rising, and the rising paper 10 flicks the elastic plates 20 at the bottom of the paper in order from the lower layer to elastically deform it into an arc shape. Rise. In this case, the elastic plate 20 elastically deforms itself while elastically deforming the buffer plate 22 into an arc shape, and since the elastic plate 20 does not directly touch the corner of the support plate 23, its radius of curvature is large.
Each elastic plate 20 does not bend at the corner of the support plate 23. In this way, when the first suction port is further raised from the position shown in FIG.
The elastic plate 20 that has released the paper 10 is released after flipping the paper 10, and the elastic plate 20 that has released the paper 10
Hold down 0. Therefore, the second sheet of paper 10 is not sucked up following the first sheet of paper 10.
When the first suction port 7 sucks up the paper 10, the second suction port 8
At the same time, the first suction port 7 releases the paper 10 while sucking the central part of the paper 10 and moving forward. The front end of the paper 10 conveyed by the advance of the second suction port 8 is captured by the upper and lower paper feed rollers 11 and 12, and the paper feed tape 1
6 onto the feeder board 17. On the other hand, the second suction port 8, which has captured the paper 10 by the paper feed rollers 11 and 12, returns to the second suction port 8 via a path higher than the forward path so as not to catch the lower layer of paper 10. Thereafter, the above operation is repeated to feed paper.

In this embodiment, the front end of the lower surface of the support plate 23 is formed into an arc shape, but the support plate 23 may have corners since the buffer plate 22 alone is sufficiently effective.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in a sheet feeding paper holding device of a sheet-fed printing press, a plurality of elastic plates formed in the shape of tongues made of thin steel plates are arranged such that the lower the layer, the more the elastic plate is moved backward. The elastic board, the buffer board, and the support board are stacked on top of each other by shifting them back and forth, and a buffer plate made of an elastic board is shifted backward and stacked on top of the buffer plate, and a support plate is further stacked on top of the buffer board by shifting it backward, and these elastic plates, buffer plates, and support plates are integrated. By fixing the elastic plate to the support plate, even if the elastic plate is repeatedly elastically deformed up and down as the paper is sucked up, the bending part is in contact with the corner of the support plate through the cushioning material, so elastic fatigue is prevented. This reduces deformation and breakage of the elastic plate, greatly improving its durability and reducing costs.In addition, there is no risk of the elastic plate being sent to the printing section due to breakage, etc., making it easier to operate the machine. The paper loss rate is improved and the amount of waste paper is reduced.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the feeding paper holding device according to the present invention, and Figure 1a is a front view thereof;
FIG. 1b is a plan view of the same, FIG. 2 is a plan view of a printing press paper feeder in which this is implemented, and FIG. 3 is a side view of the main part of FIG. 2 shown for explaining the operation. 1...Paper feeding device, 7...First suction port, 10...
Paper, 18...Paper pressing device, 20...Elastic plate, 21
...Support plate, 21a... Lower front end, 24... Set screw, 25... Nut.

Claims (1)

[Scope of utility model registration request] A plurality of elastic plates made of thin steel plates are stacked one on top of the other in a tongue-shaped manner, and are stacked on top of each other so that the lower layer recedes. Above these, there is a buffer plate made of elastic material stacked on top of the other, shifted backwards, and further above the elastic plates. A paper feeding paper holding device for a sheet-fed printing press, characterized in that a support plate that is shifted backward and stacked is fixed integrally.