JPH04153039A - Suction device of paper feed cylinder for printer - Google Patents

Abstract

PURPOSE:To make closing operation easy by providing a closable opening communicating with suction heads corresponding to paper sizes in a rotary valve pipe consisting of an air pipe in an axial direction communicating with each suction head. CONSTITUTION:A rotary valve pipe 11 is provided in a position for arranging an air pipe, embedded in a fixed pipe 12 in which outer openings 12a communicating with each communicating aperture 10 are bored, comprising a valve pipe 13 in which inner openings 13a arranged in positions conforming to paper sizes are bored. The positions of the inner openings 13a are bored so as to increase the number serially corresponding to the paper sizes. When the operation of a printer is stopped, in the case that a necessity occurs to open until a section B an open state where a distance from the center of a cylinder to a section C is open, a reciprocating rod 27 is pushed and pulled so that a coupling plate 25 is reciprocated in the direction of a cylinder axis so as to reciprocate a cam 17 in the same direction. Then, a pin 24 for the cam rotates being guided by a screwed cam groove 22 and a plug 16 rotates so as to rotate the valve pipe 13, so that the inner opening 13a having a predetermined paper size coincides with the outer opening 12a of the fixed pipe 12. Accordingly, the operation will be very simple.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a suction device for a paper feed cylinder of a printing press.

[Conventional technology and its issues]

Generally, in a double-sided printing press, it is necessary to turn the paper over at a predetermined position on the printing press, so a paper feed cylinder is provided, and this paper feed cylinder has a large number of gripping claws along the axial direction of the cylinder. A suction head is provided to attract the paper to the cylinder.

These suction heads are arranged in a straight line in the width direction of the paper, so the suction heads that are outside the width of the paper close the pulp attached to each suction head and prevent air leakage. (For example, Tokuko Sho 55-2
(See Publication No. 6982).

To describe this in detail, in FIGS. 10 and 11, reference numeral 1 denotes a double-diameter paper feed cylinder, which is supported by a cylinder shaft 2. This paper feed cylinder 1 is composed of a large number of annular cylinder bodies 3 and approximately rectangular support plates 4 for the succin head sandwiched between these cylinder bodies 3. Each of these support plates 4 has a RAD 5 is attached to a pair of saxirans with a 180 degree phase difference. This succinct head 5 communicates with an air pipe 7 via a valve 6.

Note that each support plate 4.4 is connected and fixed by a connecting rod 8, and the support plate 4 can be adjusted to be swingable within the range of an arcuate hole 9 bored in the body 3. I try to match the length.

Therefore, in such a suction device for a paper feed cylinder, the valve 6
It takes time to open and close the valves 6 at both ends of the long paper feed cylinder 1, and in particular, the operation is troublesome because there are multiple valves and their locations are far apart. There was a risk of forgetting to open and close it.

[Means for Solving the Problems] The present invention was created to solve these problems, and its gist is to provide a large number of suction heads provided on the paper feed cylinder of a sheet-fed printing press. The axial air pipe communicating with each suction head is composed of a rotary valve pipe, and the rotary valve pipe is provided with an opening that can be opened and closed and communicated with the suction head corresponding to the paper size. It is found in the suction device of the paper feed cylinder of the printing press.

〔Example〕

The structure and operation of the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

Fig. 1 is a cross-sectional view of a main part of an embodiment of the present invention, Fig. 2 is an explanatory view of various planes A, B, C, and D in Fig. 1, and Fig.
4 is an exploded view of the main part of FIG. 3, FIG. 5 is a detailed view of the main part of FIG. 1, and FIG. 6 is a sectional view of the drive device. It is suitable for double-sided multicolor sheet-fed printing machines. Note that the same parts as in the conventional example shown in FIGS. 10 and 11 are given the same reference numerals, and illustration and explanation thereof will be omitted.

In FIG. 1, a suction head 5 having a large number of small holes is fixed to the outer periphery of a support plate 4. As shown in FIG. This support plate 4 is provided with a communication hole 10 that is directed approximately toward the center of the body. This communication hole 10 communicates with a rotary valve pipe 11 as described below.

This rotary valve pipe 11 is provided at the installation position of the air pipe 7 in the conventional example described above, and is fitted inside a fixed pipe 12 having an external port 12a that communicates with each communication hole 10, and this fixed pipe 12. It also includes a valve pipe 13 having an inner opening 13a located at a position corresponding to the paper size. As shown in the developed view of FIG. 4, the positions of the inner openings 13a are bored in such a way that the number of holes increases sequentially according to the paper size, so by rotating the valve pipe 13, it is possible to correspond to the paper size. It looks like this. A ring 14 is interposed between the fixed pipe 12 and the valve pipe 13 to provide a seal.

In addition, in FIG. 6, a shaft-shaped stopper 16 is inserted and fixed into a valve pipe 13 that protrudes outward from a frame 15 supported by a drum shaft 2 at the end of the paper feed cylinder 1 shown in the conventional example. A concentric annular cam 17 is rotatably inserted into the hollow portion of the annular plug body 16. A circumferential groove 18 is recessed in the outer periphery of the stopper 16, and a stopper pin 20 attached to a bracket 19 extending from the frame 15 is fitted into the circumferential groove 18. The body 16 is prevented from sliding in the axial direction.

Further, an axial groove 21 and a spiral cam groove 22 are recessed in the outer circumference of the cam 17, and the groove 21 has a cam pin 23 attached to the bracket 19, and the spiral cam groove 22 has a plug. Cam pins 24 attached to the body 16 are fitted respectively. Therefore, if the cam 17 is moved in the direction of the cylinder axis, the valve pipe 13 will be rotated by these pins 20, 23, and 24.

A doughnut-shaped connecting plate 25 is fixed to the outer end of the cam 17, and the connecting plate 25 is sandwiched between a pair of rollers 26 and connected to a reciprocating rod 27.

Therefore, even if the paper feed cylinder 1 rotates, the reciprocating rod 27
There is no problem.

Note that the connecting plate 25 is adapted to simultaneously rotate a pair of other valve pipes. Further, in the figure, the number 2 indicates an air hole drilled in the frame 15.

Next, to describe the operation of this embodiment, in order to open and close the suction head 5 according to the paper size while the printing press is at rest, for example, as shown in FIG. However, when the width of the paper increases and it becomes necessary to open it to cross section B, all that is required is to rotate the valve pipe 13. When the operator pushes and pulls the reciprocating rod 27, the connecting plate 25 moves in the axial direction of the cylinder. The cam 17 is reciprocated in the same direction. As a result, the cam bin 24 is guided by the spiral cam groove 22 and rotates, so the plug body 16 rotates and the valve pipe 1
3 rotates, and the inner opening 13a of a predetermined paper size is inserted into the fixed tube 1.
This corresponds to the outer listening port 12a of No.2.

Therefore, if suction is performed by a vacuum pump (not shown) through the air perforation 28, only the suction head 5 of a predetermined paper size will perform the suction action.

In addition, in the rotary valve pipe of the present invention, the reciprocating port, the door 2
7 may be automatically pushed and pulled by a drive device such as a cylinder or the like, and may also be carried out during operation.

Next, a second embodiment of the present invention will be described. Unlike the first embodiment, the fixed pipe 12 is omitted, and instead, the valve pipe 12 is omitted.
As shown in FIGS. 7 and 8, the opening 13b of No. 3 is
It consists of long holes that gradually become larger.

Although the first embodiment of the present invention uses the fixed tube 12, the fixed tube 12 may be omitted if a sealing material can be interposed in the support bullet 4 as in the second embodiment. Second
The fixed tube 12 may also be used in this embodiment.

Further, the valve pipe 13 may be rotated by another driving device as described below. That is, in FIG. 9, the plug body 16 is integrated with a first bevel gear 29 and rotatably supported by the frame 15, and the first bevel gear 29 is rotatably supported by the frame 15.
9 is engaged with a first small bevel gear 30. This first small bevel gear 30 is fixed to one end of a connecting shaft 31, and a second small bevel gear 3 is attached to the other end of this connecting shaft 31.
2 is fixed. This second small gear 32 meshes with a second bevel gear 33, and this second bevel gear 33 is integrated with a cylindrical cam body 34 to form a frame 1.
5 is rotatably supported.

This cylindrical cam 34 is carved with a spiral groove 34a, and the number of the spiral grooves 34a is equal to or greater than the number N of the inner ports 13a to be opened and closed among the large number of inner ports 13a of the valve pipe 13 plus 1. The number of In other words, the cylindrical cam 34 is N+1
It is divided into equal parts, and a spiral groove 34a is carved into each part.

A bottle 35 is fitted into this cylindrical cam 34.
5 is provided protrudingly from the reciprocating support rod 36. This support iron 36 is axially biased by a buff 37 and supported by the frame 15.

The end face of this support rod 36 is appropriately pressed by a push rod 39 of an air cylinder 38. Note that 34b indicates a return groove.

Therefore, the air cylinder 38 is turned ON10FF,
The push rod 39 pushes the bottle 3 until it is detected by a sensor (not shown).
During this time, the cylindrical cam 34 rotates and the valve pipe 1 is pressed through each bevel gear 33, 32, 3029.
3 will be rotated. Note that the sensor may be placed facing the cylindrical cam 34.

Furthermore, in order to rotate the valve pipes 13, a timing belt (or chain) may be wound around a pair of valve pipes avoiding the body shaft 2, and one valve pipe may be rotated by a handle. .

〔Effect of the invention〕

According to the present invention, a rotary valve pipe is used instead of the conventional air pipe, and the rotary valve pipe is provided with an opening that opens and closes depending on the paper size, so that the rotary valve pipe can be simply rotated. The suction head is opened and closed at a predetermined position, making operation extremely convenient.

Furthermore, since a rotary valve pipe can be provided in place of the existing air pipe, it can also be applied to existing printing machines.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part of the first embodiment of the present invention, Fig. 2 is an explanatory diagram of each section A, B, C, and D in Fig. 1, and Fig. 3 is a perspective view of the main part of Fig. 1. Figure 4 is a developed view of the main parts of Figure 3,
5 is a detailed view of the main part of FIG. 1, FIG. 6 is a sectional view of the drive device, FIG. 7 is an explanatory diagram of the second embodiment, and FIG. 8 is a perspective view of the main part of FIG. 9 is a side view of another drive device, FIG. 10 is a partially cutaway perspective view of a conventional example, and FIG. 11 is a sectional view taken along arrow a in FIG. 10. l...Paper feed cylinder, 5...Sakusibon rad, 11.
...Rotary valve pipe, 13a...Inner port. A÷ B→ C÷ D÷ Figure 7 Figure 8 3a Figure 5 1゜

Claims (1)

[Claims] (1) In a large number of suction heads installed on the paper feed cylinder of a sheet-fed printing press, the axial air pipe communicating with each suction head is composed of a rotary valve pipe, and the air pipe is connected to the rotary valve pipe according to the paper size. A suction device for a paper feed cylinder of a printing press, characterized in that it has an opening that can be opened and closed and communicates with a suction head.