JPH09109368A - Machine plate for rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine plate for a rotary press which is so constituted as to easily insert the plate into the gap of a plate cylinder without plastic deformation. SOLUTION: The machine plate 1 for a rotary press is mounted at a plate cylinder 2 by inserting its gripper side plate end A and its opposite side end B to the gripper end into the gap 2c of the cylinder 2. The plate end A and the opposite side end B are formed obliquely in the lateral direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate mounted on a plate cylinder of a rotary press.

[0002]

2. Description of the Related Art FIG. 4 shows a state in which a conventional printing plate for a rotary press is folded, and FIG. 5 shows a state in which the plate is mounted on a plate cylinder of a blanket-to-blanket type offset rotary press. As seen in these figures, the plate edge A on the bite side of the printing plate 1 is bent at an acute angle to the bite portion 2a of the plate cylinder 2,
It was inserted through the gap 2c, the plate edge B on the bite end side was bent once at an obtuse angle and once at almost right angles, and was provided on the plate cylinder 2 from the bite end 2b side of the plate cylinder 2 through the gap 2c. It is inserted into the groove 3a of the tension bar 3.

After inserting the plate edge B on the bite side, the tension bar 3 is rotated to the position shown in FIG. 5, and the plate edges A and B are pressed against the inclined surface of the bite portion 2a by the outer circumference of the tension bar 3 and printed. The plate 1 is fixed to the plate cylinder 2. Since the width G of the gap 2c saves paper, it is held very small by a few millimeters so that the printing area is as small as possible. On the other hand, the gap 2c is pressed in the axial direction of the plate cylinder 2 (the width of the plate). The length of (direction) is as long as about 1 to 2 m.

As described above, since it is difficult to insert the entire width of the plate front end A or B into the gap 2c at the same time, when the plate front end is inserted, the printing plate 1 is slightly twisted so that both end portions of the plate front end A in the width direction. One of the ends of Am and Av, for example, the end Am, is first inserted into the gap 2c, and then sequentially pushed over the entire width. The plate front end B is inserted into the gap 2c in the same manner.

[0005]

As described above, in the conventional printing plate, when the plate tip is inserted into the gap of the plate cylinder, one of the ends in the width direction of the insertion tip is inserted into the gap, Then, since it is pushed in sequentially over the entire width, the operation is complicated and troublesome, and it takes time.

Further, since the printing plate is a thin (often 0.24 mm) aluminum plate or iron plate, as described above, if the printing plate is twisted when it is inserted into the gap of the plate cylinder, plastic deformation easily occurs. This deformation damages the printed image on the printing plate. SUMMARY OF THE INVENTION An object of the present invention is to provide a printing plate which can be easily inserted and can be inserted in a short time without twisting the printing plate during insertion.

[0007]

The present invention solves the above-mentioned problems in a printing plate for a rotary press, in which the tips on the bite side and the bite butt side are inserted into the gap of the plate cylinder and mounted on the plate cylinder. Therefore, there is provided a printing plate for a rotary press which is obliquely formed by cutting off at least one of the tip on the bite side and the tip on the bite side of the printing plate obliquely in one or more positions in the width direction.

Since the printing plate for a rotary press according to the present invention has the above-mentioned structure, when the front end of the printing plate is inserted into the gap of the plate cylinder and mounted on the plate cylinder, the plate front end of the plate is By simply inserting the widthwise non-cut-off tip into the gap of the plate cylinder, the cut-off edge is automatically and sequentially inserted into the gap.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a printing plate for a rotary press according to the present invention will be specifically described based on the embodiments shown in FIGS. In the following embodiments, parts having the same configurations as those of the conventional device shown in FIGS. 4 and 5 are designated by the same reference numerals for simplification of description.

(First Embodiment) First, a printing plate for a rotary press according to a first embodiment shown in FIG. 1 will be described. In the printing plate for a rotary press shown in FIG. 1, the tip A of the plate 1 on the bite side
And the ends Am and Av on both sides in the width direction of the tip B of the bite side
And Bm and Bv are cut off obliquely, and the central portions D and E are sharpened.

When the printing plate 1 for a rotary press having the above-described structure is mounted on the plate cylinder, parts D and E of the plate tips A and B are mounted.
Plate 1 by inserting each into the gap 2c of the plate cylinder.
Plate edges A and B are automatically gap 2c over the entire width
Can be inserted into.

(Second Embodiment) Next, a printing plate for a rotary press according to a second embodiment shown in FIG. 2 will be described. The printing plate for a rotary press shown in FIG. 2 is also the width direction of the bite-side plate tip A and the bite-butt side plate tip B of the printing plate 1 like the plate in the first embodiment shown in FIG. The edges Am, Av and Bm, Bv on both sides of the plate are cut off diagonally, but the central portions D and E of the plate tips on the bite side and the bite buttocks side are narrow flats (the plate edges before cutting). Remains) is different.

In the printing plate for a rotary press according to the second embodiment, as in the case of the first embodiment, when the printing plate 1 for a rotary press is mounted on the plate cylinder, the plate tips A and B are The plate tips A and B of the printing plate 1 can be automatically inserted into the gap 2c over the entire width only by inserting the portions D and E into the gap 2c of the plate cylinder, respectively.

(Third Embodiment) Next, a printing plate for a rotary press according to a third embodiment shown in FIG. 3 will be described. In the printing plate according to the third embodiment of this embodiment, the end portions Am, Av and Bm, B of the bite side plate tip A and the bite side plate tip B of the plate 1 are
One end of either v (ends Av and Bv in FIG. 3).
Side), it is cut off diagonally over the entire width, and end A
The portions D and E on the m and Bm sides are pointed.

However, as shown by the broken line, it may be cut off obliquely leaving a narrow flat portion. Contrary to the case shown in FIG. 3, the plate 1 may be cut off over the entire width from the side of the ends Am and Bm due to the insertion of the plate 1.

Also in the case of this embodiment, as described above, when the printing plate 1 for a rotary press is mounted on the plate cylinder, parts D and E of the plate tips A and B are respectively separated by the gap of the plate cylinder. The plate tips A and B of the printing plate 1 can be automatically inserted into the gap 2c over the entire width only by inserting the plate 1 into the gap 2c.

The present invention has been specifically described above based on the illustrated embodiments. However, the present invention is not limited to these embodiments and various configurations can be made within the scope of the present invention shown in the claims. It goes without saying that changes may be made.

For example, in the above embodiment, both the bite-side plate tip A and the bite-butt side plate tip B of the printing plate 1 are formed obliquely at one or more positions in the width direction. Further, it is possible to provide a printing plate having a great advantage as compared with a conventional printing plate even if an oblique portion is formed on either one of the bite end side plate tip B.

[0019]

As described above, in the printing plate for a rotary press according to the present invention, at least one of the tip on the bite side and the tip on the bite side is formed obliquely in one or more positions in the width direction. Therefore, according to this printing plate for a rotary press, the plate edge can be automatically inserted into the gap of the plate cylinder over the entire width only by inserting a part of the plate edge. Therefore, the insertion operation is simple and easy, and the insertion time is short.

Further, since it is only necessary to insert a part of the plate front end, there is no need to twist the plate during insertion, so that the plate does not plastically change and the image of the plate is damaged as in the conventional case. Furthermore, when a printing plate is mounted on the plate cylinder with an automatic mounting device, the plate can be easily inserted into the gap, which simplifies the automatic mounting device and makes it cheaper and more reliable (automatic mounting success rate).
Will be higher.

[Brief description of the drawings]

FIG. 1 is a perspective view of a printing plate for a rotary press according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a printing plate for a rotary press according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a printing plate for a rotary press according to a third embodiment of the present invention.

FIG. 4 is a perspective view of a conventional printing plate for a rotary press.

FIG. 5 is a sectional view showing a state in which a printing plate is mounted on a plate cylinder of a rotary press.

[Explanation of symbols]

1 Printing plate 2 Plate cylinder 2c Gap A Bite side plate tip B Bite tail side plate tip Am, Av, Bm, Bv Ends of operation side m and drive side v of plate tips A and B

Claims (1)

[Claims] 1. A printing plate for a rotary press, wherein the tip on the bite side and the tip on the bite end are inserted into the gap of the plate cylinder and mounted on the plate cylinder. A printing plate for a rotary press, characterized in that at least one of them is formed obliquely in one or more places in the width direction.