JPS6176367A - Plate-making device by laser - Google Patents

Abstract

PURPOSE:To provide a favorable laser plate-making device not requiring high accuracy in a mechanical driving system, by providing a laser head and a moving mechanism for a plate material fitting mechanism so that the entire surface of a plate material can be scanningly covered by a laser beam. CONSTITUTION:The plate material 3 and an original 4 are fitted to the plate material fitting mechanism 5, and by reciprocation of the mechanism 5 by the moving mechanism 6 and regular-pitch reciprocative rotation of the mechanism 5, the original 4 is read by an eye tracer 2 to discriminate a character or a picture, and the result is sent to a laser device 7. The laser device 7 engraves the character or picture on the plate material 3 by a laser beam from a laser head 1. Side surfaces of the characters or pictures on the plate material 3 is curved when the material 3 is fitted to a form cylinder 8, the direction of curvature being opposite to that at the time of engraving, so that they are inclined to the direction intersecting with the radial direction of the cylinder 8. The inclined surfaces prevent the characters or pictures from being deformed under a printing pressure at the time of printing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a laser engraving device for processing corrugated board printing plates and the like.

(Prior Art) Natural rubber has conventionally been used for printing plates for corrugated board. When engraving convex and concave characters on this natural rubber material 1.
When using mechanical plate-making equipment.

The engraving process places a large load on the natural rubber material, making it impossible to engrave accurately, requiring six people to engrave, resulting in poor work efficiency.Recently, a laser engraving device using a laser beam has been proposed.

(Problems to be Solved by the Invention) However, the conventional laser engraving apparatus requires complicated program control to tilt the sides of convex and concave characters.
The problem was that high precision was required for the mechanical and drive systems, leading to high costs.

(Means for Solving the Problems) The present invention addresses the above-mentioned problems, and includes a curved plate mounting mechanism for mounting the plate material in the recess, and a curved plate mounting mechanism for mounting the plate material in the recess, and a curved plate mounting mechanism for mounting the plate material in the recess. a laser device having a laser head, and a moving mechanism that moves one or both of the rad and the plate material attachment mechanism to the laser so that the laser beam from the laser head covers the entire surface of the plate material. The purpose of the laser engraving device is that it does not require complicated program control to tilt the sides of convex and concave characters or patterns, and it does not require mechanical drive. The object of the present invention is to provide an improved laser engraving device that does not require high precision in the system and can reduce costs.

(Example) Next, the laser engraving apparatus of the present invention will be explained using an example shown in FIGS. 1 to 6. (1) is a laser head, (
2) is an eye tracer, (7) is a laser device having the same laser head (1) and the same eye tracer (2), (3) is a plate material made of natural rubber, and (4) is the same plate material (3). Manuscript of (
5) is a curved plate material mounting mechanism for mounting the plate material (3) in the recess, and (6) is a moving mechanism for moving the plate material mounting mechanism (5). Head (1
) is adapted to move the plate material attachment mechanism (5) so that the laser beam from the plate material (3) covers the entire surface of the plate material (3). The plate material mounting mechanism (5) includes a plate material mounting mechanism driving device that rotates the plate material mounting mechanism (5) reciprocatingly at an equal pitch, but one is omitted from illustration. In this embodiment, the moving mechanism (6) moves the plate mounting mechanism (5), but even if the laser head (1) is moved, the laser head (1) and the plate mounting mechanism (5) ) may be moved. Further, the recessed portion of the plate material attachment mechanism (5) is not limited to an arcuate cross-section, but may have another cross-sectional shape.

(Function) Next, the function of the laser plate making apparatus will be explained. The plate material (3) and the original (4) are mounted on the plate material mounting mechanism (5), and the movement mechanism (6) moves the plate material mounting mechanism (5) back and forth and the plate material mounting mechanism drive device (not shown). ) plate mounting mechanism (5
), the eye tracer (
2) reads the manuscript (4), identifies the nine characters and patterns, sends the results to the laser device (7), and the laser device (7)
The signal at this time turns on/open the laser head (1).
by the laser beam from the laser head (1) when turned on.

Letters or pictures are engraved on the plate material (3) (see Figure 5), and the sides of the letters or pictures on the plate material (3) are along the radial direction on the plate material attachment mechanism (5). When removed from the 1st plate material attachment mechanism (5) and attached to the printing cylinder (8) of the 1st corrugated board printing device, the printing cylinder (
Since the printing cylinder (8) is curved along the outer peripheral surface in a direction opposite to that during engraving, it is inclined in a direction crossing the radial direction of the printing cylinder (8). Note that this inclined surface has the role of preventing characters and patterns from deforming due to printing pressure during printing.

(Effects of the Invention) As described above, the laser plate making apparatus of the present invention includes a curved plate mounting mechanism for mounting a plate in a recess, and a laser device having a laser head at a position facing the recess of the plate mounting mechanism. ,
The method includes a moving mechanism that moves one or both of the laser head and the plate material attachment mechanism so that the laser beam directed to the laser and from the throat covers the entire surface of the plate material, and the above-described operation is performed. Therefore, in order to tilt the sides of convex and concave letters and patterns, there is no need for complicated program control, and there is no need for high precision in the mechanical drive system, which is effective in reducing costs. Although the invention has been described with reference to embodiments, the present invention is of course not limited to such embodiments, and may be modified in various ways without departing from the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a laser engraving apparatus according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a plan view thereof.
The fourth tooth is a side view thereof, FIG. 5 is an explanatory diagram showing the state at the time of plate making, and FIG. 6 is an explanatory diagram showing the state of attachment to the printing cylinder. (1)... Laser head, (3)... Plate material, (5)
...Plate material attachment mechanism, (6)...Movement mechanism, (7).
...Laser device. Sub-agent Patent Attorney Shigefumi Okamoto and 3 others

Claims (1)

[Claims] a curved plate material mounting mechanism for mounting the plate material in the recess; a laser device having a laser head at a position facing the recess of the plate material mounting mechanism; and a laser beam from the laser head covering the entire surface of the plate material. A laser plate making apparatus comprising: a moving mechanism for moving one or both of the laser head and the plate material mounting mechanism so as to move the laser head and the plate material mounting mechanism.