JPS638908Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a screen angle changing printing device.

With conventional gravure, there was no need to change the angle of the gravure screen for each page and print the gravure screen on the carbon paper, but since net gravure etc. have been used, moiré can occur depending on the angle of the gravure screen. This caused a major problem in the printing process. In the case of such net gravure, when printing the net positive onto the carbon tissue, if the angle of the net positive used is not a standard angle, adjust the angle of the gravure screen to an angle that does not cause moiré.
It is necessary to bake it on a carbon plate.
In particular, if the angles of each page are different, prepare a large number of gravure screens with various angles that cover the same size, set each page on a carbon tissue at an angle that does not cause moiré, and use a light-shielding mask. Must be baked in combination. Furthermore, in the case of positives with non-standard angles or reused positives, the current situation is that it is extremely time-consuming due to the above-mentioned reasons.

FIG. 1 is an explanatory diagram showing a conventional gravure screen printing method. Further, FIG. 2 is an explanatory diagram of a printer type of the conventional screen printing method. a is transparent glass, b is gravure screen (glass or film), c is carbon tissue, and d
When e is brought into close contact with transparent glass a using a rubber sheet or the like by vacuum pump suction, light f is applied from transparent glass a. In addition, the printer type is the opposite of the above, and the light is applied from above, and a' is a transparent film or glass, b' is a gravure screen (film), c is a carbon fiber, and d' is a vacuum board. Youmu board
By suctioning toward d', all the parts are brought into close contact with the vacuum board. Exposure for printing is performed from above the transparent film a'.

Using this method, for example, as shown in the explanatory diagram in Figure 3, out of the four B5 wide pages, two pages, as shown in Figure A, use reused versions of B and B gravure screens with different screen angles. In this case, the first printing is performed using a standard version of screens A and A (standard angle gravure screen) with two pages cut out. using
Place masks B′ and B′ on other pages and print them.
For the second time, as shown in Figure B, the gravure screens B and B, which have different screen angles from the above standard angle gravure screens A and A, were placed on two other pages, and the gravure screens A and A that were used for the first time were placed on another two pages. Place masks A′ and A′ on the spot and burn them. Gravure screen A placed on Teitshu C,
B is because each positive is printed at a different angle, so the gravure screen also needs to be printed at different angles in advance to prevent moiré.

The baking device of the present invention was designed to eliminate the above-mentioned complications, and is for rings where the circular screen ring is flush with the board surface (frame side) of the conventional baking frame. An embedded annular groove is provided, and a screen ring is embedded in this to allow easy setting (or removal) of the gravure screen.The ring is made to be able to rotate freely along the annular groove. Make a scale so that the angle display can be identified (1° to 5° intervals are best). On the other hand, a reference line is also provided at one location on the board surface.

That is, FIG. 4 is an explanatory diagram showing an example of a printing method using the circular gravure screen and light-shielding mask of the present invention, and FIG. 5 is a cross-sectional explanatory diagram of the printing apparatus of the present invention.

1 is a vacuum board, and 2 is a transparent glass or film that is used for printing. 3 is a hinge portion, and 4 is a vacuum suction port for vacuum-adhering the inside of the transparent presser cover 2 when it is set. Further, 5 is a vacuum suction port for suctioning the carbon tissue 6. 7 is a light shielding mask.

The most important point of this invention is that a circular rotating screen ring 8 is installed on the top surface of the baking frame board (hereinafter referred to as the "bakyum board") 1.
A circular (gravure white line) screen 1 is rotatably embedded in an annular groove 9 with a depth matching the surface of the screen ring 8 and set on the screen ring 8.
0 is provided on the screen ring 8 as a fixing means, and by providing through holes 12 through which each of the plurality of pins 11 passes, the gravure screen can be stably set on the screen ring. FIG. 6A is an enlarged explanatory view of the X section in FIG. 5. In addition, as a fixing means, a plurality of pin holes 14 are provided in the screen ring 8 as shown in FIG. You can also.

A reference line 13 for determining the center is provided on the vacuum board 1, and an angle scale (1° to 5°) is carved on the screen ring 8.

When using the gravure screen angle changing printing device of the present invention, first
Align the center of the carbon tissue 6 with the reference line 13 above (the center is marked on the tissue 6 to prevent moiré with the screen positive that will be printed), and then remove it using the vacuum suction port 5. The carbon tissue 6 is fixed on a vacuum board by vacuum suction, and then set on the screen ring 10 by passing its pin 11 through a through hole 12 provided in the circular gravure screen 10. Alternatively, it may be set using a fixing means as shown in FIG. 6B. Next, the gravure screen 10 set on a freely rotating screen ring is adjusted to the required angle, and a light-shielding mask 7 is placed on top of the gravure screen 10 to block unnecessary pages (at different angles). The presser cover 2 is covered, and the pressure is reduced through the vacuum suction port 4, so that the entire board is tightly fixed on the board 1. Next, the transparent glass or film presser lid 2 is exposed to light from outside to print on the carbon tissue 6. In this operation, the angles of the light shielding mask 7 and the screen 10 are changed depending on the types of positives with different angles to be printed.

As the printing light source, the light source generally used for gravure can be used as is (ultra-high pressure mercury lamp, carbon arc lamp, etc.). In addition, the light-shielding mask is preferably as thin as possible (such as stainless steel tape of 0.02 m/m or less) in order to prevent blurring of the area surrounding the surrounding pattern.

In the present invention, when replacing the carbon tissue, the screen ring 8 can freely rotate along the annular groove 9 provided on the vacuum board, and there is no need to remove each ring individually. It can be easily set and removed by passing the pin 11 of the ring through the through hole 12, or by the fixing means shown in FIG. 6B.

As described above, the present invention has a circular screen ring rotatably embedded in the circular groove provided on the upper surface of the baking frame vacuum board with a surface that coincides with the circular groove, and a connection between the upper surface of the circular screen ring and the circular screen. Since this is a screen angle changing printing device that fixes the gravure screen and the screen ring with a plurality of corresponding fixing means provided on the outer periphery, a carbon tissue is attached to the vacuum board of the baking frame. is fixed with a vacuum, and a circular gravure screen is set on a rotating ring, so by aligning the scale of the ring with the reference line on the vacuum board, the desired screen angle can be determined correctly, and the angle can be changed like the conventional one. There is no need to carefully determine and set the screen angle each time, and unlike conventional methods, there is no need for skill, and printing can be done in a short period of time without error. It is no longer necessary to prepare a large number of screens of various sizes and angles, and it is now sufficient to prepare one or two spare circular screens, making it possible to easily change the angle of one page when printing without requiring any skill. became possible.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the conventional screen burning method, Figure 3 is an explanatory diagram showing the conventional method of burning four pages, and Figure 4 is the screen angle changing firing method of the present invention. FIG. 5 is an explanatory diagram of the screen angle changing printing device of the present invention. FIG. 6 A is an enlarged explanatory diagram of the
Figure B is an enlarged explanatory view of the X section showing another fixing means. 1...Bakyum board with baked frame, 2...
...Transparent film or glass presser lid, 3...Hinge, 4...Vacuum suction port for entire body, 5...Carbon tissue suction port, 6...Carbon tissue, 7...Light shielding mask, 8... Rotating screen ring, 9... Annular groove in which the screen ring is rotatably embedded, 10... Circular (gravure) screen, 11... Pin, 12... Through hole provided in the film, 13... Reference line, 14...pin hole, 15...
…Barapin.

Claims (1)

[Scope of utility model registration request] In a device that prints one page or several pages on a carbon paper (or a photoresist with the same effect) using a combination of a gravure screen and a light-shielding mask, the surface and An annular screen ring is rotatably buried in matching surfaces, and the screen and the screen ring are fixed by a plurality of corresponding fixing means provided on the upper surface of the annular screen ring and the outer periphery of the circular screen. Screen ring angle changing printing device.