JPH0244288Y2 - - Google Patents

Description

[Detailed explanation of the invention] Color printed matter is obtained by overprinting the yellow, red, indigo, and black plates created in the plate-making process using ink of each color in the printing process. Therefore, if the image printing positions of each color plate are not constant, so-called color misalignment will occur in printed matter.
This will significantly reduce the quality of printed matter.

Therefore, in the plate-making process, strict positional control, that is, registration, is performed for each color plate to be created, and this work procedure will be explained using a printing process using a plate printing machine as an example.

As is known, image printing by a plate printing machine involves printing a unit image (i.e., an image on one film manuscript) onto the plate surface, such as 6-sided printing, 8-sided printing, etc. It is used for accurate positioning and multi-sided printing.

In the printing process, the basic work is to attach the film original to the original holder, which is a member for holding the film original. At this time, the film original for creating each color plate is attached to the original holder. By keeping the mounting position of the film original constant, registration is performed so that the image printing position of each color plate is mutually constant.
The plate printing machine is equipped with a precise positioning function, so as a result, the image printing position of each color plate is mutually constant).

What is used for this registration is a specialized registration device called a cross gauge, and a light table known as a multi-purpose workbench that can also be used for registration.

However, the basic concept of these conventional register configurations is to form two straight lines perpendicular to a transparent base surface such as acrylic resin or glass plate, and to position these straight lines on the center line in the X and Y directions, respectively. The idea was to support it with a support frame in this way.

Therefore, with reference to FIG. 1, the outline of the registration work will be explained using as an example a registration device called a cross gauge, which is a typical registration device constructed according to this concept.

That is, the registration device 1 has a transparent material 4 formed with two registration lines 3x, 3y orthogonal to the surface fixed to the lower surface of a cross-shaped support frame formed of a cross-sectional material, Furthermore, a locking pin 7 for locking into a locking hole 6 of a document holder 5 of the plate printing machine shown in the figure is provided to protrude downward.

To achieve registration using this method, first, the film original 8 to be printed is placed on the transparent plate 50 of the original holder 5.

Then, the registration device 1 is lowered from above, and the locking pin 7a and the locking pin 7b are respectively inserted into the locking hole 6a and the locking hole 6b.

Through the above operations, the film original 8 is brought into a state in which it is lightly pressed against the surface of the transparent plate 50 by the own weight of the registration device 1.

At this time, the X of the transparent plate 50 shown by the imaginary line
The registration lines 3x, 3y of the registration device 1 are automatically placed on the center lines 50x, 50y in the Y direction. It's out of alignment.

Therefore, register marks 80 photographed around the image area 8' of the film original 8 are precisely superimposed on the registration lines 3x, 3y using a magnifying glass, and the film original 8 is placed on a transparent plate. 5
It is fixed to the 0 plane, but in this case, the work involves overlapping straight lines of the same color (usually black), making it difficult to distinguish between the lines.

Under this condition, the registration line 3x,
It is necessary to satisfy the condition for accurate registration, which is to place the center of register mark 80 on the center of 3y, which is a very difficult task and reduces work efficiency. However, in the end, the results often turned out to be incorrect.

The present invention was proposed in view of the above, and completely eliminates the basic concept related to the configuration of the conventional register device, which is ``arranging the register line on the center line in the X and Y directions.'' First, "parallel straight lines for registration are formed that are equidistant from the center lines in the X and Y directions," and register marks are positioned between the parallel straight lines for registration. ,
Therefore, for each register mark, the film original is manipulated until the pair of areas formed by each register mark and the parallel straight lines sandwiching it are equal to each other.
By finely adjusting the position and orientation of the marks, each register mark is automatically placed on the center line in the X and Y directions, making the registration process easier and registering more accurate. One of its features is that it has significantly improved the

In the present invention, regarding the above-mentioned parallel straight lines for registration, "a colored transparent material whose background color is as light as possible is placed on a black background that is clearly distinguishable from the ground color of the transparent material and that can be seen through the colored transparent material. The paper is formed with a color that can be clearly distinguished from the background of negative image film (the background of negative image film) or the colorless transparent background (the background of positive image film). It is characterized by the fact that

That is, when the film original is a negative image film, as shown in FIG. 4, there is a register mark (corresponds to the number 80 in FIG. (not shown) appears colorless and transparent on a black background (the background color of negative image film), so if you use the so-called normal method of placing black registration lines on a colorless and transparent background, it will be difficult to see through the negative image. The registration line is buried in the black background of the film, making it impossible to use.

In this invention, as a result of repeated consideration of a solution to this problem (a method that can be effectively used not only for positive image film but also for negative image film), we have developed a solution to this problem by constructing it as described above. It has been experimentally confirmed that the purpose can be achieved, and various combinations of the background color of the colored transparent material and the color of the parallel straight lines for registration can be adopted, but in experiments by the inventors, yellow colored It has been confirmed that when red parallel straight lines for registration are formed on a transparent material, the effect is extremely good both in the case of a positive image film and in the case of a negative image film.

Hereinafter, one embodiment will be described in detail with reference to drawings showing one embodiment.

FIGS. 2 and 3 are views showing an embodiment of the present invention, and FIG. 2 is a perspective view of an example of the register according to the present invention, viewed from a plane on which a register line is arranged.

FIG. 2 shows a preferred embodiment of the registration device according to the present invention. A colored transparent material 4 on which parallel straight lines 10x and 10y for registering are formed, each having an equal distance from the support frame 4 shown in FIG. A registration device 1 is configured by being fixed to a cross-shaped support frame 2.

The colored transparent material 4 is made of, for example, a transparent material with a yellow base color, and parallel straight lines 10x for registration are used.
As mentioned above, when +10y is formed in red on a yellow background color, extremely desirable effects can be obtained.

Figure 3 shows an enlarged view of the working procedure using the registration device of the present invention, taking the case of negative image film as an example, and Figure A shows the state before registration is performed. Figure B shows the state after registration has been achieved.

Since it is a negative image film, the register mark 80 is formed colorless and transparent on a black background 81 shown in a checkered pattern for convenience of drawing, but when viewed through the registration device of the present invention, it is colored. Transparent material 4
(Assuming the ground color is "yellow"), you will actually see a slight yellow tint.

Although the parallel straight lines 10y, 10y for registration are shown with diagonal lines for convenience of drawing, it is assumed that they are formed in red, which is suitable for the yellow background color.

At this time, in terms of color, as described above, there is a relationship between the register mark 80 that looks slightly yellowish, the black background 81 as the background color of the negative image film, and the parallel red registration straight lines 10y, 10y. However, they each have the effect of clearly showing the colors of the other, and as shown in FIG. Y
The operation of locating the center 80' of the register mark 80 on the center line 9y of the direction is extremely easy to perform, and the accuracy of the operation is inevitably improved.

As shown in FIG. B, accurate registration means that areas 11 and 11' are made equal;
That is, the widthwise distance d between areas 11 and 11'
This is done by using a magnifying glass and making small adjustments to the film manuscript so that the image is the same everywhere.The operator's intuition is the standard, so to speak, but the work is very easy to do, and In this way, the accuracy of the intuitive method of adjusting the horizontal (or vertical) spacing by sandwiching the register mark between parallel straight lines is not influenced by personal factors such as the level of skill involved in registration. , an almost perfect image can be obtained (complete identity in the sense of ultra-precision is the most desirable, but even if this is not possible, there is no deviation in the image printing position of each color plate with respect to each other, and accurate registration is achieved. Prior to proposing this invention, we conducted repeated experiments with the inventor and several other workers to confirm that This is considered to confirm that this applies universally to all workers.

It should be noted that although the procedure for the case where the film original is a negative image film has been explained with reference to FIG. 3, it is of course also effective when the film original is a positive image film. That is, in the case of a positive image film, the parallel red registration straight line 10x, 10x or 1
Black register mark 80 between 0y and 10y
It is extremely clear and there is no problem.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the procedure for registering in the document holder of a printing press using a conventional register device, Fig. 2 is a perspective view of the register device of the present invention, and Fig. 3 is a diagram of the register device of the present invention. FIG. 4, which is a partially enlarged view showing the procedure for registration, shows the register mark portion of the negative image film. Explanation of the attached numbers: 1... Registration device, 2... Support frame, 3x, 3y... Registration lines, 4... Transparent material or colored transparent material, 5... Document holder, 8...
...Film original, 10x, 10y...Parallel straight lines for registration, 80...Register mark.

Claims (1)

[Claims for Utility Model Registration] (a) Parallel straight lines for registration are provided, each of which is equidistant from the center line in the X and Y directions. (b) The above-mentioned parallel straight lines for registration are placed on a colored transparent material whose ground color is as light as possible, and which are clearly distinguishable from the ground color of the transparent material, and which are visible through the transparent material (negative image film). be formed with a color that can be clearly distinguished from a colorless transparent background (the background of a positive image film) or a colorless transparent background (the background of a positive image film). A registration device that satisfies both (a) and (b) above.