JP3435396B2 - A sharp angle correction machine for the edge of the printing plate - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge angle correction machine for mounting a printing plate on a plate cylinder of a rotary printing press.

[0002]

2. Description of the Prior Art A printing plate made of a soft resin to be mounted on a plate cylinder of an offset rotary printing press has an edge fold formed on two parallel sides, and a gripping mechanism provided on the plate cylinder holds the edge fold. I am trying to wear it. This gripping mechanism has a structure in which it cannot be held in the grip unless the edge folding part is bent at an acute angle. Therefore, conventionally, an edge is sharply bent while being modified by heating with an expensive heating device. I am trying.

[0003]

Conventional printing plates such as aluminum-based PS plates and the like have been able to form sharp edge folds by a simple bending operation, but they have been adopted in recent years. Since the printing plate based on the soft resin, which has been bent at an acute angle, returns to a fold angle of about 90 degrees due to the elastic resilience of the material, it is heated by a bending device equipped with heating means. While adding denaturation, it folds sharply to maintain that angle.
However, the edging device equipped with a heating means is expensive and not easy to introduce, and the edging process while heating requires skill and time, which is an obstacle to labor saving and improvement of work efficiency. there were.

[0004]

SUMMARY OF THE INVENTION According to the present invention, an edge-folding portion of a printing plate is pressed from one end to an acute angle by a main body for correcting an acute angle which travels on a flat workbench, and is subjected to crushing and folding correction.
The problem is solved.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A flat workbench 1 is formed. 2 is a short base leg provided at the four corners of the back surface. The workbench 1 is made of a metal that works well with a magnet and is formed in a rectangular shape in a plan view. Reference numeral 1a is a protection sheet for preventing scratches. Bearings 4a, 4b in which a long strip-shaped ruler 3 is projectingly provided along one long side on the work table 1 and is screwed upright to the outside of both ends in the length direction.
A round shaft 5 is stretched between them. A cuboid-shaped acute angle correcting main body 7 having an operation handle 6 provided on the upper surface of the round shaft 5 is attached so as to be openable and closable in the front-back direction and reciprocally movable. On the inner surface of the main body 7, that is, the surface facing the workbench 1, a guide piece 7a is provided which is close to and parallel to the inside of the ruler 3 and has a gradually increasing horizontal bending angle from a large guide angle serving as an entrance. Adjacent to the guide piece 7a, there is provided an acute angle correction roller 7b that rotates on the workbench 1. Numeral 8 is a stopper for pinching that is provided inside one end of the ruler 3 and is formed with a slight gap between the ruler 3 and the workbench 1 and with elasticity to narrow the gap. Reference numeral 9 is a ruler for lateral application, and 10 and 10 are magnet bodies for fixing the presser foot.

As shown in FIG. 2, the acute angle correcting main body 7 is opened and rotated to open the guide piece 7a and the roller 7b from the workbench 1, and the flexible resin printing plate 11 is temporarily folded in advance to about 90 degrees. The entire length of the edge-folded portion 11a is applied to the ruler 3, one end of the edge-folded portion 11a is folded at an acute angle and inserted under the stopper 8 to be clamped, and the entire printing plate 11 is pressed and fixed by the magnet bodies 10 and 10. Then, the main body 7 for correcting the acute angle is closed and rotated at the position on the stopper 8 side to face the main body 7 toward the bearing 4b on the other side.
Is pushed and run. The edge folding portion 11a of the printing plate 11 is guided by being guided below the inclined surface of the guide piece 7a.
Is gradually bent at an acute angle, and then the roller 7b for correcting the acute angle crushes the edge-folded portion 11a guided to rotate and run to correct the edge-folded portion 11a at an acute angle. That is, the roller 7b for correcting an acute angle runs on the edge-folded portion 11a while sequentially crushing the edge-folded portion 11a in a pointwise manner, thereby giving the edge-folded portion 11a a sharp fold that is not restored. After the sharp fold correction of the edge fold portion 11a, the main body 7 is opened and rotated to rotate the magnet bodies 10,10.
And remove the printing plate 11 from the stopper 8 and reverse the printing plate 11 that has become free, and apply the other edge fold 11b to the ruler 3 to correct the same sharp angle fold on the edge fold 11b. To do.

The edge folding parts 11a and 11b are connected to the guide piece 7a.
Since it is gradually bent into an acute angle and is guided below the roller 7b for correcting the acute angle, the escape of the printing plate 11 due to the reaction force does not occur at all in the process of correcting the acute angle folding of the edge folding parts 11a and 11b.

[0008]

As described above, according to the present invention, it is possible to surely correct an edge fold of a printing plate made of a soft resin into an acute angle with a simple structure and a simple operation without requiring skill. The effect that it can be produced.

In addition to sandwiching one end of the edge-folding portion with a stopper, a guide piece gradually bends the edge-folding portion into an acute angle in front of a roller for correcting the acute angle, so that printing occurs due to repulsion accompanying the acute-angle correction of the edge-folding portion. There is an effect that the escape of the plate is surely prevented and the edge fold portion of the printing plate can be accurately corrected to an acute angle.

Since it is possible to visually confirm all the processes of the acute-angle folding correction of the edge-folded portion, there is an effect that the acute-angle-folded correction of the edge-folded portion is not insufficient at all.

There is an effect that an acute-angle fold correction of an edge fold portion of a printing plate based on a soft resin can be efficiently performed by an inexpensive device.

[Brief description of drawings]

FIG. 1 is a perspective view showing an apparatus and a printing plate according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a main body for sharp angle correction is pivotally opened and a printing plate is set.

FIG. 3 is a partially enlarged view showing a step of gradually guiding an edge fold portion to an acute angle by a guide piece and subsequently pressing the edge fold portion to an acute angle by a roller for correcting an acute angle.

FIG. 4 is a perspective view showing a printing plate on which sharp edge folds are formed.

[Explanation of symbols]

1 is a workbench 2 is a foot 3 is a ruler 4a and 4b are bearings 5 is a round shaft 6 is an operation handle 7 is the main body for sharp angle correction 7a is a guide piece 7b is a roller for sharp angle correction 8 is a stopper 9 is a ruler for horizontal application 10 and 10 are magnets 11 is a printing plate 11a and 11b are edge folds

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41F 27/00

Claims (4)

(57) [Claims] 1. A flat belt-like ruler is projected on the upper surface of a flat work table, a round shaft is stretched between bearings sandwiching the ruler, and the round shaft is for acute angle correction capable of opening and closing in the front-rear direction. Of the main body for correcting the acute angle, the guide piece having an inclined surface for guiding parallel to the inner surface of the main body for correcting the acute angle and running inside the ruler and the inner surface of the main body for correcting the acute angle and the acute angle correcting body. A roller is provided, and the edge folding portion of the printing plate made of a soft resin, which is temporarily folded at about 90 degrees, is applied to the ruler, and one end of the edge folding portion is clamped by a stopper provided inside one end of the ruler. Then, the main body for sharp angle correction is closed and rotated, and the roller for sharp angle correction following the guide piece on the edge folding part from the stopper side is pushed and crushed by the roller for sharp angle correction to perform the sharp folding correction on the edge folding part. A sharp angle corrector for the edge of the printing plate, which is characterized in that 2. The acute angle corrector according to claim 1, wherein the guide piece has an inclined surface from a wide angle to an acute angle, and the edge fold portion is gradually bent at an acute angle to guide it below the roller for acute angle correction. 3. The acute angle corrector according to claim 1, wherein the printing plate is held and fixed by a plurality of magnet bodies. 4. The correction machine according to claim 1, wherein a handle for operating the body is provided on an upper surface of the body for sharp angle correction.