JPH0244287Y2 - - 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, ie, registration, is carried out for each color plate to be produced.This procedure will be explained 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. And, as the basic work of the printing work,
There is work to attach the film original to the original holder, which is a member for holding the film original.
At this time, registration is performed so that the image printing positions of each color plate are mutually constant by keeping the mounting position of the film original for producing each color plate on the document holder 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, and these straight lines are located on the center line in the X and Y directions, respectively. In this way, it was supported by a support frame.

Therefore, as a typical device constructed according to this concept, a registration device called a cross gauge is shown in FIG. 1 for explanation. That is, the registration device 1 has a transparent material 4 formed with two registration lines 3x, 3y perpendicular to the surface fixed to the lower surface of a cross-shaped support frame 2 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 arranged on the center lines 50x, 50y in the Y direction, but the register marks 80 of the film original 8 are placed on the center lines 50x, 50y in the Y direction. It's out of place.

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
There is a method that fixes it to plane 0, but in this case, the work involves overlapping straight lines of the same color (black), making it difficult to distinguish between the lines. Under these conditions, it is necessary to satisfy the condition for accurate registration, which is to place the center of the register mark 80 on the center of the registration lines 3x and 3y, which is a very difficult task. As a result, work efficiency decreased, and even when careful registration was performed, the result was that the registration was often incorrect.

This idea was proposed in view of the above circumstances.
The basic concept of the conventional register configuration, which is to place registration lines on the center lines in the X and Y directions, has been completely dispelled, and the registration lines are placed equidistant from the center lines in the X and Y directions. In order to form parallel straight lines for use in registration,
The register marks are respectively positioned between the parallel straight lines, and the film is then By manipulating the document and finely adjusting the position and orientation of the register marks, each register mark is automatically placed on the center line in the X and Y directions, making it easier to perform registration work. This greatly improves the ease of registration and the accuracy of registration.

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

FIGS. 2 and 3 show embodiments of the present invention, and FIG. 2 is a perspective view of an example of the registration device according to the invention, viewed from a plane on which a registration line is arranged.

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

Figure 3 shows an enlarged view of the working procedure using the registration device of the present invention, with Figure A showing the state before registering, and Figure B showing the state after registering. Figure A is out of register, so register mark 80 and parallel straight line 1
A pair of areas 1 indicated by diagonal lines formed by 0y
1 and 11', the area 11 is wider than the area 11', and the orientation of the register mark 80 is inclined with respect to the center line 9y in the Y direction indicated by an imaginary line.

So, with a magnifying glass, Elijah 11 and 11'
Figure B shows the position and orientation of the register mark 80 finely adjusted by manipulating the film original so that the areas 11 and 11' are equal, and the center 80' of the register mark 80 is the same.
is precisely placed on the center line 9y in the Y direction indicated by an imaginary line.

Furthermore, the areas 11 and 11' must be equal, that is, the distance d in the width direction between the areas 11 and 11' must be constant at any location (complete identity in an ultra-precise sense is most desirable, but this is not possible. At the very least, there is no discrepancy in the image printing position between each color plate,
The work of confirming that the registration is accurate is performed while looking through a magnifying glass, and is based on the operator's intuition. is the standard, but the work is very easy to do, and in this way, the accuracy of the intuitive way of adjusting the left and right (or up and down) spacing by sandwiching the register marks between parallel straight lines depends on the accuracy of registration. Prior to proposing this invention, the inventor and several other workers confirmed that an almost perfect product could be obtained without being influenced by personal factors such as skill level. The experiment has been repeated and confirmed, and this is considered to confirm that it is universally applicable to all workers.

[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. 3 is a partially enlarged view showing the procedure for registration. Explanation of the appended numbers: 1... Registration device, 2... Support frame, 3x, 3y... Registration line, 4... Transparent material, 5... Original holder, 8... Film original,
10x, 10y...Parallel straight lines for registration.

Claims (1)

[Scope of utility model registration request] A registration device comprising parallel straight lines for registration, each of which is equidistant from a center line in the X and Y directions.