JPH068404A - Blanket mounting device for offset proof press - Google Patents

Abstract

PURPOSE:To enable relatively readily mounting (changing) a blanket on a blanket cylinder in a short time as well as readily performing tension control of the blanket. CONSTITUTION:A gap 4a is provided in a surface of a blanket cylinder 4 to extend along the length of the blanket cylinder 4, and both ends of a blanket 1 are inserted into and attached to the gap 4a to be held on the blanket cylinder 4. Plate-shaped bodies 6 are attached to the both ends of the blanket 1. A nipping device 7 comprises a lower bearing plate 9 biased radially outwardly of the blanket cylinder 4 and received in the gap 4a and an upper bearing plate 11 which is vertically movable to face the lower bearing plate 9, and serves to hold the both plate-shaped bodies 6 at the top and bottom thereof by means of the lower and upper bearing plates 9 and 11 so as to prevent the plate-shaped bodies from coming off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset calibrator for performing a calibration work, for example, in which the blanket can be mounted on the blanket cylinder with a uniform tension and the offset (simplification) operation is simplified. The present invention relates to a blanket mounting device for a calibrator.

[0002]

2. Description of the Related Art Conventionally, the work of mounting (replacement) the above blanket on the blanket cylinder has generally been performed manually according to the procedure shown in FIG.

That is, first, markings are made at bolt mounting positions on both ends of the blanket 1, and bolt holes 1a into which bolts are to be inserted are made at the marking positions (FIG. 1 (a)). Next, a pair of iron bars 2 each having a thickness of 5 mm, a width of 20 mm, and a length of 1100 mm, for example, are attached to both front and back surfaces at both ends of the blanket 1 and fixed with bolts 3 (FIG. 1B).

On the other hand, on the surface of the blanket cylinder 4, there is provided a single strip 4a extending along the entire length of the blanket cylinder 4 so that the iron bars 2 are located in the gap 4a. Then, the blanket 1 is wound around the blanket cylinder 4, and a fastening metal fitting 5 that is in contact with the upper end surfaces of the iron bars 2 positioned in the gap 4a and facing each other is attached to hold the blanket 1 so that the blanket 1 cannot be removed. The tension of the blanket 1 was adjusted by changing the position of the iron bar 2 in the gap 4a by adjusting the tightening amount of the iron bar 2 (FIG. 7C).

[0005]

However, in the case of the above-mentioned conventional example, at the time of mounting (replacement) of the blanket, marking of the drilling position, drilling and bolt threading work are required.
It is necessary to carry out, for example, 15 places on one side for one color and 30 places on both sides, which not only takes about 2 hours for this exchange work, but also results in a blanket exchange period of 2 months. There is a problem that it becomes difficult to maintain the quality (reproducibility) for a long time such as once.

In view of the above, the present invention provides a blanket which can be mounted (replaced) on the blanket cylinder relatively easily and in a short time, and the tension of the blanket can be easily adjusted. The purpose is to

[0007]

In order to achieve the above object, a blanket mounting device of an offset calibrating machine according to the present invention is provided with a gap extending along the length of the blanket cylinder on the surface of the blanket cylinder. In a blanket mounting device of an offset calibrating machine, in which both side edges of the blanket are inserted into the gap to hold the blanket, a plate-like member is attached to both end portions of the blanket, and the blanket cylinder is radially outside. A lower receiving plate biased toward one side and accommodated in the gap, and an upper pressing plate movable up and down toward the lower receiving plate. The lower receiving plate and the upper pressing plate form the both plate-like members. It is characterized in that it is provided with a pinching device for holding from above and below so as not to escape.

[0008]

According to the present invention configured as described above, the plate-like members attached to both end portions of the blanket are moved with the upper holding plate toward the lower receiving plate without performing work such as marking or punching. The blanket can be attached to the blanket cylinder by holding it with the tucking device so that the blanket can be held, and the plate-like object is held by the tucking device against the biasing force acting on the lower backing plate. By changing the position, the tension of the blanket can be adjusted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, plate-like bodies 6 made of, for example, aluminum and having a substantially rectangular cross section and extending along the lengthwise direction are attached to both end portions of the blanket 1. The plate-shaped body 6 is attached to the side end surface of the bracket 1 by caulking or the like.

On the other hand, a gripping device 7 for mounting the blanket 1 on the blanket cylinder 4 is held in the gap 4a provided in the blanket cylinder 4 by holding the respective plate-shaped bodies 6 in such a manner that the plate-shaped bodies 6 cannot be removed. ing.

That is, the pinching device 7 is provided with a plurality of bolts 8 which are erected in the radial direction of the blanket cylinder 4 at a predetermined pitch along the lengthwise direction substantially in the center of the gap 4a in the width direction. A lower receiving plate 9 having the bolts 8 inserted therein, a leaf spring 10 for urging the lower receiving plate 9 outward along the axis of the bolt 8, and the lower receiving plate It is mainly configured by an upper pressing plate 11 which is arranged outside 9 and through which the bolts 8 are inserted, and nuts 12 which are respectively screwed into the bolts 8. In addition, number 1
3 is a washer.

A pair of accommodating portions 14 for accommodating the plate-like member 6 are formed between the lower receiving plate 9 and the upper pressing plate 11 on both sides of the bolt 8. Located on the outside of each of the accommodating portions 14, the lower receiving plate 9 has a concave portion 9a, and the upper pressing plate 11 has the concave portions 9a.
At the positions corresponding to, the convex portions 11a that fit with the convex portions 11a are provided, respectively.

As a result, in a state where the plate-like bodies 6 are accommodated in the accommodating portions 14, the bid portion is sandwiched between the lower receiving plate 9 and the upper pressing plate 11 and is held so that it cannot be removed. At the same time, the peripheral portion of the blanket 1 is positioned between the concave portion 9a of the lower receiving plate 9 and the convex portion 11a of the upper pressing plate 11 and is forcibly bent, so that the clamping is strengthened. ing.

Further, by tightening the nut 12, the upper pressing plate 11, and thus the pinching device 7 itself is lowered against the elastic force of the leaf spring 10, thus changing the position of the pinching device 7. By doing so, the tension of the blanket 1 can be adjusted.

Further, as shown in FIG. 2, the lower receiving plate 9
A coil spring 114 is interposed between the upper pressing plate 11 and the upper pressing plate 11 at a predetermined pitch along the lengthwise direction thereof, and is located outside the blanket cylinder 4 and is located above the upper pressing plate 11. A toggle-type pressing metal fitting 15 for moving the above toward the lower receiving plate 9 is arranged.

Next, the blanket 1 in the above embodiment
The replacement work will be described. First, the blanket cylinder 4
To remove the blanket 1 attached to the lower bracket 9 and the upper presser plate 1, loosen each nut 12.
This is done by unpinching the blanket 1 with 1, i.e. by escaping the plate 14 from the receiving part 14 formed by the lower receiving plate 9 and the upper pressing plate 11. At this time, due to the elastic force of the coil spring 114,
The upper pressing plate 11 is flipped up, that is, in a direction away from the lower receiving plate 9, and this work can be easily performed by this flipping up.

When the other blanket 1 is mounted on the blanket cylinder 4, the plate-like members 6 are attached to both end portions of the blanket 1 in advance. Housing 1 formed between the holding plate 11
The blanket 1 is wound around the blanket cylinder 4 so as to be positioned inside the blanket 4, and in this state, the upper pressing plate 11 is lowered toward the lower receiving plate 9 via the toggle type pressing metal fitting 16.
Then, by tightening the nut 12, the upper pressing plate 11 is further lowered, and the plate-like bodies 6 attached to both end portions of the blanket 1 are held by the tucking device 7 so as not to be able to escape.

At this time, the tension of the blanket 1 can be adjusted by changing the holding position of the plate-like body 6 in the pinching device 7 against the elastic force of the leaf spring 10.

[0019]

Since the present invention has the above-mentioned structure,
While the tension of the blanket can be easily adjusted, the work of mounting (replacement) the blanket on the blanket cylinder can be performed relatively easily and in a short time. by this,
There is an effect that the quality (reproducibility) of proof printing can be improved by immediately responding to the deterioration of the surface condition of the blanket.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a side view of a blanket mounting device.

FIG. 3 is a schematic view showing a conventional example in process order.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Blanket 4 ... Blanket cylinder 4a ... Gap 6 ... Plate-like body 7 ... Clamping device 8 ... Bolt 9 ... Lower receiving plate 10 ... Leaf spring 11 ... Upper pressing plate 12 ... Nut 14 ... Storage part 15 ... Toggle type presser Metal fitting 114 ... Coil spring

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yutaka Tomita 7 Enokicho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd.

Claims (1)

[Claims] 1. An offset calibrating machine, wherein a gap extending along the length of the blanket cylinder is provided on the surface of the blanket cylinder, and both side edges of the blanket are inserted into the gap to hold the blanket. In the blanket mounting device, plate-shaped bodies are attached to both end portions of the blanket, and the lower receiving plate and the lower receiving plate are urged outward in the radial direction of the blanket cylinder and accommodated in the gap. An offset calibrator characterized by having a vertically movable upper presser plate, and a lowering plate and an upper presser plate, which are provided with a tucking device for holding both plate-like members from above and below in a non-ejectable manner. Blanket loading device.