JPS6147720B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for engraving engravings, particularly to an engraving method using a photoelectric copy engraving machine.

Traditionally, certificates of award, letters of appreciation, home stamps, photographs, etc. can be printed on engraved boards,
Preferably, in order to engrave a metal plate using an engraving machine, a positive engraving original made from these original certificates, etc. is usually wrapped around the scanning cylinder of the engraving machine, and the metal plate is attached to the board cylinder. The original image for engraving is scanned by a photoelectric scanning device to obtain electrical output signals corresponding to the white and black parts, and the electrical output signals are amplified through an amplifier and sent to a cutter head placed opposite to the metal plate. The cutting process is performed by controlling the cutting depth of the cutting tool into the metal plate by supplying the cutting tool to a drive device that supports the cutting tool so that it can be freely displaced in the cutting direction.For example, the signal current is large for the white part of the original image On the other hand, the cut of the cutting tool is deep and the black part is normally kept uncut, and the size of the cut corresponding to the black and white part of the original image is controlled, and the rotation of the common rotation axis of both cylinders and the synchronized horizontal movement of the cutter head and scanning head are controlled. By feeding, the Katsutahed cuts the metal plate synchronously with the original painting, thus obtaining a sculpture corresponding to the original painting. In other words, the white part was deep, and the closer to black, the shallower the cutting process was performed, and the desired overall engraving image was obtained from all of these cutting lines.

According to this method, the depth of cut corresponding to the shade from black to white is given to the cutting tool, so for example, a uniformly white part can be cut in a spiral shape with a constant depth of cut by rotating the cylinder and moving the cutter head horizontally. formed by parallel lines. Therefore, the overall result is a sculpture of a collection of long cutting lines lined up in parallel.

Generally, engraving plates are made by coating a bare metal plate with a black film and engraving on it.
In reality, the depth of cut is reduced by the thickness of the film, and there is also the resistance of the film, so it is difficult to cut the film according to the light density (white or black) signal and then cut to the metal underneath. be. Therefore, compared to the actual original image, the black parts remain as they are, and the black ends up becoming stronger, making it difficult to faithfully reproduce the contrast.

In addition, such engravings do not only give a relatively simple artistic effect, but due to continuous cutting, the cutting tool suffers a lot of wear and tear, and on the metal plates that are commonly used, it may become impossible to engrave in a short period of time. In many cases, cutting for a long time was impossible. In addition, cutting waste continued to cling to the cutting tool for a long time, interfering with cutting. Furthermore, there were various problems such as the inability to faithfully reproduce the contrast of the halftone portion of the original image in the engraving image.

The present invention provides an inexpensive and easy engraving method that eliminates such defects. According to this method, engraving is carried out by wrapping a transparent film with evenly distributed black speckles over the positive original image and attaching it to an engraving machine. By scanning with the optical scanning head in this state, even in the white part that should be cut by cutting with the cutting tool, there are black dots corresponding to the spots on the film, so there are some dots that will not be cut at those positions. Therefore, the white part also changes from continuous cutting to corresponding discontinuous cutting.

In discontinuous cutting, the inertia of the cutting tool can be used to penetrate the black coating and cut into the bare metal even in the case of intermediate shading. In contrast, even in the case of intermediate shading, it is possible to achieve a contrast close to the original, resulting in an engraving that faithfully reproduces the contrast of the original as a whole, and it is also possible to cut the tool over a long period of time, etc. Defects are removed.

An example of an apparatus for implementing the present invention will be described in more detail below with reference to the drawings.

FIG. 1 is a schematic diagram of the main parts of a well-known electronic copy engraving machine, in which 1 is a transmission mechanism, 2 is a common shaft, 3 is a scanning cylinder, 4 is a board cylinder, 5 is a scanning head, and 6 is a cutter head. , 7 is a drive shaft, 8 is an amplifier, and 9 is a cutting tool.

Although not shown, the common shaft 3 causes the scanning cylinder 4 and the board cylinder 5 to rotate at the same time via a transmission mechanism by a driving motor. A separate drive shaft 7 moves the scanning head 5 and the cutter head 6, which is disposed opposite the board cylinder 4, in a direction parallel to the common axis. A photoelectric sensor is fixed to the scanning head 5, which scans the original image for engraving and generates an electric signal corresponding to the density of the scanned point on the original image, which is supplied via an amplifier 8 to a cutting tool drive device carried by the cutter head. A cut proportional to this current is given to the cutting tool 9.

Since the above structure is well known, detailed explanation of each part will be omitted. Figure 2 is an original drawing 21 in which a black-patterned house shibori is drawn on a transparent film.When using this to create a sculpture, a white paper is placed underneath it, and the above-mentioned dots are uniformly placed on top of it. The distributed transparent films 22 are overlapped and wrapped around a scanning cylinder. In this way, the same effect can be obtained as if a transparent film having uniformly distributed dots was superimposed on a black and white original drawing for engraving.

FIG. 3 shows a film having the above-mentioned uniformly distributed spots. For example, spots of 0.2 mmφ are uniformly distributed over the entire film at a distance of 0.5 mm on each side. This film is designated as 22. A portion of the sculpture thus completed is shown in Figure 4. For reference, FIG. 5 shows an engraved image engraved by a conventional method.

When using this method, for example, by using the film of the above-mentioned spots as a film in which irregular shapes are uniformly distributed as shown in FIG. An engraving image having the ground striations as shown is obtained.

As described above, the present invention attaches a film with uniformly distributed dots superimposed on the original image, and amplifies the discontinuous detection output generated by photoelectrically scanning the film.
Since engraving is performed while controlling the cutting depth, the white part is also discontinuously cut, which solves the problems of wear caused by continuous cutting and the problem of cutting waste being wrapped around. This method has superior effects such as increased fidelity and other superior effects compared to conventional methods, and can be obtained easily and inexpensively by simply using a superimposed film of dots. .

Although it is common to use positive originals for engravings, it is possible to do the opposite, and even use film with white speckles, which produces other interesting effects.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the main parts of a conventional copy engraving machine.
FIG. 2 shows an example of an original image for engraving, FIG. 3 shows an example of a film with evenly distributed dots used in the present invention, and FIG. 4 shows a part of an engraved image produced by the method of the present invention. Fig. 5 shows a part of a sculpture produced by a conventional method, Fig. 6 shows an example of a film in which oddly shaped speckles are uniformly distributed, and Fig. 7 shows an example of a film produced using the film shown in Fig. 6 according to the present invention. A portion of the sculpture produced using this method is shown. 1 is a drive mechanism, 2 is a common shaft, 3 is a scanning cylinder, 4 is a board cylinder, 5 is a scanning head, 6 is a cutter head, 7 is a drive shaft, 8 is an amplifier, 9 is a cutting tool, 21 is an example of an original image , 22 is an example of a film in which spots are uniformly distributed.

Claims (1)

[Claims] 1. In a method of producing an engraving picture from an original picture for engraving on a carving plate using a photoelectric copy engraving machine, a transparent film with uniformly distributed dots is superimposed on the original picture film, and the engraving machine A method for engraving an engraving image, which is characterized in that the engraving is carried out by photoelectrically copying and engraving by attaching an engraving board to the scanning cylinder of the board cylinder.