JPH0144509Y2 - - 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 for stacking paper for printing, a first suction port of a suction device that suctions stacked papers one by one starting from the upper layer, and a first suction port for sucking the stacked paper one by one, starting from the upper layer. and a second suction port that sucks up the central part of the paper 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, a plurality of 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. It is fixed integrally with the support plate that has been shifted and stacked, and
The front end of the lower surface of the support plate with which the uppermost elastic plate contacts was formed into a gentle arc shape.

[Effect]

With this configuration, even if the elastic plate, which is repelled at its rear end by sucking up paper, is repeatedly elastically deformed up and down, the bent portion contacts the arcuate surface, resulting in less elastic fatigue.

〔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, a pair of left and right feed frames 3 whose rear ends are connected by a horizontal member rearward. 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. Satsuka device 4
A plurality of first suction ports 7 are arranged in parallel in the width direction of the machine and are movable vertically, and a plurality of second suction ports 8 are arranged in parallel 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 moves downward and suctions the rear ends of the papers 10 stacked on the paper stacking table 9 one by one, starting from the upper layer, and ascends. It moves forward after sucking the center part of the paper, and moves forward until the paper 10
The front end of the paper is captured between paper feed rollers 11 and 12 which are rotating and in contact with each other vertically. Lower paper feed roller 12 and rollers 13,1
A plurality of paper feed tapes 16 parallel to each other in the width direction of the machine are stretched between the paper feed rollers 11 and 15. 17 and ready for supply to the printing unit.

In the paper feeding device 1 roughly configured as described above, a paper holding device, generally indicated by the reference numeral 18, is supported by a support rod 19 protruding from the main body side of the suction device 4, and is provided at approximately the center of the paper width. ing. This paper holding device 18 is equipped with a plurality of elastic plates 20 formed in the shape of tongues from thin steel plates, and these elastic plates 20 are stacked in a staggered manner so that the lower layer is receded. It is integrally fixed by an upper set screw 23 and a nut 24 held between upper and lower support plates 21 and 22 formed in a short strip shape. In this case, the upper support plate 21 is set back from the uppermost elastic plate so that its front end is substantially aligned with the lowermost elastic plate 20, and its lower front end 21a is formed in an arc shape. When the uppermost layer elastic plate 20 in a horizontal state as shown in FIG. 1 is elastically deformed as shown in FIG.
The point of contact between the front end portion 21a of the lower surface and the
It is formed in a gentle arc shape so as to move sequentially from a point indicated by P ₁ to a point indicated by P ₂ in FIG. Paper pressing device 18 configured in this way
is attached so that the protruding portions of the elastic plate 20 from the support plates 21 and 22 face above the paper ends of the stacked paper 3. Although not shown, the paper feeder 1 is provided with a blower for blowing 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 uppermost elastic plate 20 is in contact with the support plate 21 at point _P1 in FIG.
moves the contact point forward with elastic deformation,
When the elastic deformation ends, it contacts the support plate 21 at point _P2 in FIG. Therefore, each elastic plate 20 does not bend at the corner of the support plate 21. In this way, when the first suction port further rises beyond the position shown in FIG. Hold paper 10. Therefore, the second sheet of paper 10 is not sucked up following the first sheet of paper 10. The first suction port 7 is paper 1
0, the second suction port 8 suctions the central part of the paper 10 and moves forward, and at the same time the first suction port 7 sucks the paper 10.
to release. The paper 10 conveyed by the forward movement of the second suction port 8 is moved so that its front end is fixed to the upper and lower paper feed rollers 11 and 1.
2 and fed onto the feeder board 17 by the paper feed tape 16. On the other hand, the second suction port 8 has the paper 10 captured by the paper feed rollers 11 and 12.
The paper 10 moves backward and returns via a route higher than the outgoing route so as not to catch the lower layer of paper 10. Thereafter, the above operation is repeated to feed paper.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the paper 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 stacked one on top of the other while being shifted back and forth so that the lower layer recedes, and integrally fixed above the elastic plates with a support plate that is stacked on top of the other and shifted backwards. By forming the front end of the lower surface of the support plate, which is in contact with the uppermost layer of elastic plate, into a gentle arc shape, even if the elastic plate is repeatedly elastically deformed up and down when the rear end of the support plate is repelled when the paper is sucked up, the bent portion Since the contact points of the plate contact a gentle circular arc surface while sequentially moving forward, there is less elastic fatigue and less deformation and breakage of the elastic plate, greatly improving its durability and reducing costs. There is no risk of the elastic plate being sent to the printing section due to breakage, etc., improving machine operating efficiency and reducing the amount of waste paper generated.

[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 ... Bottom front end, 23 ... Set screw, 24 ... Nut, P ₁ ... Contact start point between elastic plate and support plate, P ₂ ... Contact between elastic plate and support plate Completion point.

Claims (1)

[Scope of utility model registration request] A plurality of elastic plates formed in the shape of tongues made of thin steel plates are stacked one on top of the other while being shifted back and forth so that the lower layer recedes, and is integrally fixed above the elastic plates with a support plate that has been shifted backward and stacked,
When the lower front end of the support plate in contact with the uppermost elastic plate is elastically deformed so that the tip of the uppermost elastic plate faces upward, the contact point between the lower front end and the elastic plate is sequentially moved forward. A paper feed paper holding device for a sheet-fed printing press, characterized in that it is formed in an arcuate shape so as to move toward the opposite direction.