JP2516167B2 - Blanket mounting device for blanket cylinder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blanket mounting device for mounting a blanket on a blanket cylinder of a printing machine.

[0002]

2. Description of the Related Art As a conventional blanket mounting device for mounting a blanket on a blanket cylinder of a printing machine, for example, those disclosed in the following publications are listed. 1. The "blanket cylinder" described on page 203 of "Newspaper printing, revised edition" (published by the Japan Shimbun Association, October 31, 1980) is a fillet provided in advance on both ends of the blanket. A bar (hereinafter referred to as "edge") is inserted into a groove provided on the outer peripheral surface of the blanket cylinder parallel to the axis, and is held by a T-shaped bar. The blanket is attached to the blanket cylinder by tightening the bolts into the screw holes formed in the bottom surface.

2. Japanese Patent Publication No. 4-52777 and U.S. Pat. No. 4,599,943 disclose a reinforcing web at one end of a blanket in a groove provided in the outer peripheral surface of the blanket cylinder in parallel with the axis. Below "margin"
) Is inserted, engaged with a fixed rail that is bolted in the groove, and after being fixed, the other end of the blanket is introduced into the slit of the fixed spindle provided in the groove, and is wound by the rotation of the spindle. As a result, the blanket is attached to the blanket cylinder.

3. What is disclosed in Japanese Utility Model Laid-Open No. 58-58545 is that a presser foot (hereinafter referred to as an “edge”) provided at both ends of the blanket is provided in a groove provided on the outer peripheral surface of the blanket cylinder in parallel with the axis. The blanket is attached to the blanket cylinder by inserting the bolts and tightening the bolts into the screw holes provided on the bottom surface of the groove from above the respective edge bars.

[0005] 4. JP-A-57-160644, JP-A-62-111745, JP-A-3-19038
No. 3,893,394 and U.S. Pat. No. 4,766,811 disclose a blanket cylinder having an opening on the outer peripheral surface thereof, which is internally branched. A winding rod, a strip or a cap provided with two grooves and provided at both ends of the blanket (hereinafter collectively referred to as "edge metal").
Is inserted into each of the two grooves, and the blanket is attached to the blanket cylinder by tightening bolts into the screw holes formed on the bottom of each groove from above the edge of the blanket. Is.

[0006]

According to the above-mentioned conventional techniques: The "Blanket cylinder" described on page 203 of "Newspaper Printing, Revised Edition" (published by the Japan Shimbun Association, October 31, 1980) has a T-shaped configuration with bolts tightened. Since the edges of both ends of the blanket are pushed into the groove at the same time by the bar, it is not possible to install the blanket while adjusting the tension individually at each end, and even if one of the ends loosens due to operation,
It is not possible to adjust only the loosened end.

2. In Japanese Patent Publication No. 4-52777 and U.S. Pat. No. 4,599,943, since the blanket is attached while only one end is being tensioned, loosening is likely to occur during operation. . Also, due to the structure
As the opening width of the groove becomes wider, not only the non-printing area becomes larger, but also the opening width of the blanket mounting groove of the blanket cylinder becomes larger than the opening width for plate mounting provided on the plate cylinder. If the width is the same or wider, the swelling of the blanket due to the bending near the opening edge of the blanket mounting groove in the plate cylinder rotating in contact with the blanket cylinder causes the plate cylinder Since it strikes, it will adversely affect the printing plate.

3. Japanese Utility Model Laid-Open No. 58-58545 and Japanese Patent Application Laid-Open No. 57-160644.
Japanese Patent Laid-Open No. 62-111745, Japanese Utility Model Laid-Open No. 3-1903.
No. 8, U.S. Pat. No. 3,893,394 and U.S. Pat. No. 4,766,811 all have a blanket that is tightened by tightening both ends with bolts on both sides. Although it has the advantage that it can be worn while adjusting, because both ends of the blanket are tightened separately,
The work is very troublesome.

The present invention solves the above problems in the prior art, and provides a time-consuming blanket mounting device for a blanket cylinder which can be adjusted so that both ends of the blanket are always at a uniform tension. It is provided.

[0010]

The blanket mounting device for a blanket cylinder of the present invention is formed on the outer peripheral surface of the blanket cylinder in parallel with the axis of the blanket cylinder, and has blanket insertion grooves and blanket insertion grooves into which both end edges of the blanket are inserted. A pressing member that is provided in the insertion groove so as to be displaceable in the depth direction of the groove so as to be opposed to each other, and both edge portions of the blanket can be engaged with each other, a rack provided on the pressing member, and a rack of the opposing pressing member simultaneously. It is composed of a pinion that meshes with the pinion, and a pushing member that rotatably supports the pinion and that is provided in the blanket insertion groove so as to be displaceable in the groove depth direction.

[0011]

In the blanket mounting device for the blanket cylinder described above, first, when the pushing member is displaced toward the opening of the blanket insertion groove, the pushing member also moves integrally with the holding member through the rack and pinion. It is displaced toward. Then, the pressing member comes to the position closest to the opening.

Therefore, the edge metal of one end edge of the blanket is inserted into the opening of the blanket insertion groove and engaged with the pressing member, and then the blanket is wound around the blanket cylinder,
The edge metal of the other edge is inserted into the opening and engaged with the pressing member facing the pressing member. Then, the pushing member is displaced toward the groove bottom of the blanket insertion groove. Then, the pressing member is also pushed toward the groove bottom of the blanket insertion groove through the rack and pinion together with the pressing member.

Therefore, since both end edges of the blanket in which the respective edge members are engaged with the respective pressing members are evenly drawn into the blanket insertion groove, the blanket is tightened to the outer peripheral surface of the blanket cylinder. .

As the tightening of the blanket progresses, there may be a difference in tension at both edges of the blanket. In that case, a difference in displacement speed occurs between the one pressing member and the other pressing member facing each other due to the difference in tension. For example, one may stop. Then, due to the action of the rack and pinion mechanism, the displacement speed of the pressing member with the smaller tension is higher than the displacement speed of the other pressing member, and the edge with the smaller tension is drawn into the blanket insertion groove further than the other. . Thus, the blanket is mounted on the blanket cylinder with equal tension on both edges.

When removing the blanket from the blanket cylinder, the force for restraining the pushing member from the top surface side is released. Then, the pressing member can be displaced to a position closest to the opening, and the blanket clamped on the outer peripheral surface of the blanket cylinder is completely loosened. Therefore, the blankets are removed from the blanket cylinder by removing both edge metals of the blanket from the pressing member and taking out from the opening.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A blanket mounting device for a blanket cylinder in an embodiment of the present invention will be described with reference to the drawings. The blanket cylinder 1 of the printing section in the offset printing machine shown in FIGS. 1 and 2 has, for example, a metal fillet bar (hereinafter referred to as “edge metal”) F over the entire length at each of both parallel end portions.
The blanket B to which a and Fb are attached is attached by a blanket attaching device.

Explaining the blanket mounting device, a blanket insertion groove 2 parallel to the axis is formed in the blanket cylinder 1, and the blanket insertion groove 2 has a hollow section 3 and a blanket having a rectangular cross section as shown in FIG. An opening 4 is formed on the outer peripheral surface of the body 1 and is narrower than the cavity 3. An outer end of the cavity 3 has a step 3a formed by the inner end of the opening 4. A blanket mounting mechanism is provided in the cavity 3.

The blanket mounting mechanism includes a holding member 5
A pair of a and 5b are provided, for example, and each pressing member 5a (5b) is a comb-shaped piece having substantially the same thickness as the stepped portion 3a of the cavity 3 and an appropriate length. Holding member 5a (5
In b), a rack 6a (6b) is formed by engraving teeth at right angles to the direction of the comb tooth portion on one outer surface of each comb tooth portion, and on the same side surface as the rack forming surface of the back portion 7. A protruding portion 8a (8b) is formed along the edge.

The pressing member 5a (5b) is provided on the rack 6a (6
The side surface opposite to the side b) is brought into contact with both side surfaces of the hollow portion 3, and the comb tooth portion is inserted into the hollow portion 3 with the blanket insertion groove 2 facing the groove bottom. That is, a set of two pressing members 5a (5b)
The racks 6a (6b) are opposed to each other with a space. A compression coil spring 9 is fitted between the tip of each comb tooth of the pressing member 5a (5b) and the groove bottom of the blanket insertion groove 2. That is, the pressing member 5a (5b) is
It is constantly urged toward the opening 4 by the compression coil springs 9.

The blanket mounting mechanism further includes a pressing member 11 that is a comb-shaped piece having substantially the same length as the pressing member 5a (5b) and that supports the pinion 10 that simultaneously meshes with the opposed racks 6a and 6b. It is equipped between. That is, the pinion 10 has an axis parallel to the longitudinal direction of the blanket insertion groove 2 in an appropriate gap between the comb teeth of the pushing member 11.
It is provided so as to be rotatable by 12.

Then, the pressing member 11 is the double pressing member 5.
Between the racks 6a and 6b of a and 5b, the comb tooth portion is inserted into the hollow portion 3 with the blanket insertion groove 2 facing the groove bottom, and the pinions 10 are simultaneously meshed with the racks 6a and 6b facing each other. Therefore, the pressing member 11 is compressed by the compression coil springs 9, 9 ...
Is being urged toward.

A bolt parallel to the comb teeth is provided in an appropriate gap where the pinion 10 of the comb teeth of the pushing member 11 is not provided.
13 is rotatably inserted into the back of the pushing member 11, and the tip of each bolt 13 has a screw hole at the bottom of the blanket insertion groove 2.
The head portion 13a is screwed into the head 14, the head portion 13a is located close to the opening portion 4, and the flange portion 15 formed in the middle portion is the top of the back portion of the pushing member 11 biased toward the opening portion 4. Abutting on the surface, the pushing member 11 is restrained at a predetermined position.

In the above blanket mounting mechanism, the pressing member 5a (5b) and the pressing member 11 may be the ones that extend over the entire length of the blanket insertion groove 2 or the ones that are divided into appropriate partial lengths, if necessary. You can Also, the racket 6a and 6b do not face each other and the blanket insertion groove 2
May be alternately staggered in the longitudinal direction, and longer pinions may be engaged with both racks 6a and 6b at the same time.

An operation of mounting the blanket B on the blanket cylinder 1 by the above blanket mounting device will be described. First, when the bolt 13 is loosened, the compression coil springs 9, 9
The pressing members 5a and 5b are displaced toward the opening 4 by the spring force of. Thereby racks 6a, 6b, pinion
The pressing member 11 also holds the pressing member 5a through the bearing shaft 10 and the bearing shaft 12,
It is displaced toward the opening 4 integrally with 5b. And
When the bolt 13 is pulled out, the pressing members 5a and 5b become the stepped portion 3a.
And the protrusions 8a and 8b are closest to the opening 4.

Therefore, the edge metal F at one edge of the blanket B
a is inserted into the opening 4 and engaged so as to be hooked on the protruding portion 8a of the pressing member 5a, then the blanket B is wound around the blanket cylinder 1, and the edge metal Fb at the other end is inserted into the opening 4. The protrusion 8b of the pressing member 5b is engaged so as to be hooked.

Then, each bolt 13 is inserted through the back of the pushing member 11, and the head 13a is operated to screw it into the screw hole 14.
In response to the screwing of the bolt 13, the flange portion 15 pushes the top surface of the back portion of the pushing member 11, and pushes the pushing member 11 toward the groove bottom of the blanket insertion groove 2. Then rack 6
Pressing member 5 via a, 6b, pinion 10 and bearing shaft 12
a and 5b are also integrally formed with the pressing member 11 and are compression coil springs 9,
9 is pushed toward the groove bottom of the blanket insertion groove 2 against the spring force.

Therefore, both end edges of the blanket having the rims engaged with the protrusions of the pressing members 5a and 5b are uniformly drawn into the blanket insertion groove 2, so that the blanket B is the outer peripheral surface of the blanket cylinder 1. Will be locked in.

As the tightening of the blanket B progresses, the tension at both edges may differ. In that case, due to the difference in tension, the pressing member 5a and the pressing member 5b
And a difference in displacement speed occurs. For example, one may stop. Then, due to the action of the rack and pinion mechanism, the displacement speed of the pressing member 5a having the smaller tension is higher than the displacement speed of the other pressing member 5b, and the edge metal Fa having the smaller tension, that is, the edge is further than the other. It is drawn into the blanket insertion groove 2. Thus, the blanket B is mounted on the blanket cylinder 1 with the tensions at both edges being equal.

To remove the blanket B from the blanket cylinder 1, loosen the bolts 13, 13, ...
And pull out from the opening 4. Then, the pressing members 5a, 5b are pressed by the spring force of the compression coil springs 9, 9 ...
The blanket B, which comes to the position closest to the opening 4 that is in contact with a and is fastened to the outer peripheral surface of the blanket cylinder 1, is completely loosened. Then, the blankets B and Fb at both end edges of the blanket B are sequentially removed from the projecting portions 8a and 8b of the pressing members 5a and 5b and taken out from the opening 4, so that the blanket B is removed from the blanket cylinder 1.

In the above embodiment, bolts are used as the pressing means for the pressing member 11, but any suitable known means such as a fluid pressure cylinder may be used.

[0031]

According to the blanket mounting device of the present invention, when the blanket is mounted on the blanket cylinder of the printing machine, both ends of the blanket are tightened at the same time, and the blanket is automatically adjusted without adjusting each end. Since it is adjusted so that it is always pulled with the same tension, the mounting work is easy and the work efficiency is improved. Further, because of the structure, the width of the opening of the blanket insertion groove may be small, so that the non-printing area is small and the printing plate of the plate cylinder rotating in contact with the blanket cylinder is not adversely affected.

[Brief description of drawings]

FIG. 1 is a perspective view of a blanket mounting device for a blanket cylinder according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the blanket mounting device for the blanket cylinder in the embodiment of the present invention.

[Explanation of symbols]

 1 Blanket Body 2 Blanket Insertion Groove 3 Cavity 3a Step 4 Opening 5a, b Holding Member 6a, b Rack 7 Back 8a, b Projection 9 Compression Coil Spring 10 Pinion 11 Pushing Member 12 Shaft 13 Bolt 13a Head 14 Screw Hole 15 Flange part Fa, b Edge metal B Blanket

Claims (1)

(57) [Claims] 1. In a blanket cylinder of a printing press, a blanket insertion groove formed on the outer peripheral surface of the blanket cylinder in parallel with the axis of the blanket cylinder, into which both end edges of the blanket are inserted, and a groove depth in the blanket insertion groove. The pressing member, which is provided so as to be displaceable in the opposite direction and is capable of engaging both end edges of the blanket, the rack provided on the pressing member, the pinion that simultaneously meshes with the rack of the opposed pressing member, and the pinion are rotatable. A blanket mounting device for a blanket cylinder, which comprises a pressing member that is supported and is displaceable in the blanket insertion groove in the depth direction of the groove.