JPH0447719Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a vacuum printing frame for creating plates for screen printing.

(Prior Art) When performing multicolor printing, it is necessary to accurately arrange the number of screen plates corresponding to the number of colors required for printing in a printing press using an electrical changeover switch or the like. This screen plate is created using a positive film on a screen stretched within a screen frame using a vacuum suction device. The position of the screen frame in the vacuum suction device matches the position in which the screen frame is held within the printing machine in the subsequent printing process, and the positioning of the screen frame in the suction device is easily performed. On the other hand, the position of the positive film within the vacuum suction device must be maintained so that it can be accurately exposed and copied.

Generally, the position of the positive film is adjusted while being measured using a scale provided in advance on the vacuum printing frame. However, if the distance between the scale and the positive film is too large, measurement becomes difficult and troublesome, and furthermore, misalignment of the copied image occurs due to measurement errors, which can cause printing defects in the subsequent printing process. Sometimes.

(Problems to be solved by the invention) As mentioned above, this invention makes it difficult and troublesome to measure the position of the positive film when the distance between the scale and the positive film is large. This is an attempt to solve the problem of misalignment of copied images caused by errors, which can cause printing defects in the subsequent printing process. To provide a vacuum printing frame that can accurately determine the position of a positive film without adversely affecting the film, and can prevent printing defects.

Structure of the invention (means to solve the problem) In order to solve the above problems, this invention
In a vacuum printing frame consisting of a transparent member provided in a support and a screen that is pressed against the transparent member through a positive film by vacuum suction, the exposure side of the transparent member is opposite to the On the surface of the side positive film placement side, perpendicular to each other,
In addition, a measurement line having translucency is formed by an etching method.

(Function) By employing the above-described means, this invention can measure the position of the positive film that is in close contact with the light-transmitting member based on the measurement line.

Further, even if the transparent portion of the positive film and the measurement line are in the same position, the emulsion in the transparent portion is reliably hardened because light passes through the measurement line formed by etching.

(Example) A first example of this invention will be described in detail below with reference to FIGS. 1 to 5.

A light-transmitting member 2 made of a glass plate is mounted inside a legged square ring-shaped support 1 that is placed upright on a floor, etc., and a support rail that extends across the entire width of the support 1 is installed. 3 is mounted to be movable up and down, and a screen frame 4 is mounted on the support rail 3.
is fixed. Alignment marks 5 and 6 are formed at the center of the upper horizontal bar 4a and both left and right vertical bars 4b of the screen frame 4, respectively, and can be aligned with indicator pieces 7 and 8 movably attached to the support 1. It's summery. A screen 9 is pasted inside the screen frame 4, and a positive film 10 is placed between the screen 9 and the light-transmitting member 2. The screen 9 is coated with a photosensitive emulsion, and a light projector (not shown) is provided on the opposite side of the positive film 10 across the light-transmitting member 2 to expose the photosensitive emulsion through the positive film 10. It is designed to be cured.

An upper mounting bar 12a extending horizontally is provided on the upper part of the support 1, and a soft rubber seal member 12 is adhered to the entire length of the lower surface of the upper mounting bar 12a. Further, a pair of left and right mounting bars 13a, 14a extending in the vertical direction are movably suspended from the upper edge of the support 1, and the entire length direction of the mutually opposing side edges of these mounting bars 13a, 14a is Rubber seal members 13 and 14 are provided so that their positions can be adjusted. Similarly, a soft rubber seal member 15 extending in the horizontal direction is also provided on the upper surface of the support rail 3.
The screen frame 4 has seal members 12, 1 on its four sides.
It is in contact with 3, 14, and 15. Further, a vacuum pipe 17 (see Fig. 2) is introduced into the space 16 surrounded by the seal members 12, 13, 14, and 15 through the screen frame 4, and a vacuum pump is operated to suck the vacuum. When performing this, the positive film 10 and the screen 9 are pressed against the light-transmitting member 2.

As shown in FIG. 3, measurement lines 18 and 19 extending vertically and horizontally are provided on the side of the light-transmitting member 2 that contacts the positive film 10 in the shape of a grid pattern.

As shown in FIG. 4, although the measurement lines 18 and 19 appear to be pale in color, they are actually only semi-transparent in appearance due to the etching method. These translucent measurement lines 18 and 19 are drawn at intervals of 30 cm at a density that can be visually confirmed, and their positions can be adjusted with an accuracy of up to about 1/10 mm. In addition, the measurement lines 18 and 19 are
Set to a width of 0.5mm and a depth of just a few microns,
The spacing between each line is 1 cm. Note that the thickness of the transparent member 2 is 8 mm.

As shown in FIG. 4, the areas of the glass surface 20 where the measurement lines 18 and 19 are formed are formed by etching points 21, and between these etching points 21 a transparent area 22 is provided. Note that even if this etched portion is so thick that it can be seen with the naked eye, the glass plate 2 will not lose its translucency.

Now, a method for producing a screen printing plate using the vacuum printing frame configured as described above will be described below.

In FIG. 1, one surface of the screen 9 is coated with a photosensitive emulsion, and the screen frame 4 is arranged so that this surface faces the transparent member 2 of the support 1. Then, the screen 9 of the light-transmitting member 2
A positive film 10 is pasted on the side surface. At this time, as shown in FIG. 3, the position of the positive film 10 is confirmed from the exposure side surface 20 of the transparent member 2 based on the measurement lines 18 and 19, and if there is an error between this position and the predetermined position, is adjusted to place the positive film 10 at an accurate position.

After the position adjustment of the positive film 10 is completed, the screen frame 4 is placed on the seal member 15 of the support rail 3. After this, screen frame 4
The support rail 3 is moved upward until the upper horizontal bar 4a contacts the seal member 12, and the upper and lower edges of the screen frame 1 are brought into close contact with the seal members 12 and 15, respectively. After this, the left and right mounting bars 13a, 14
a is moved to bring the seal members 13 and 14 into contact with both side edges of the screen frame 4. Then, the outer edges of the four sides of the screen frame 4 are attached to the seal members 12 to 1.
4, the space 16 between the screen 9 and the light-transmitting member 2 is completely blocked from the outside.

After the space 16 is completely isolated from the outside, the suction pump S is turned on to suction the air in the space 16 to create a vacuum state. Then, the screen 9 is pressed onto the light-transmitting member 2 via the positive film 10. In this state, a light beam is projected onto the transparent member 2 from the exposure side. The same ray is positive film 1
The emulsion on the screen 9 is hardened by passing through the transparent part of the positive film 10, but the blackened part of the positive film 10 is not exposed, and the emulsion in this part is kept in the same soft state as when it was coated. Thereafter, when the screen 9 is treated with water and developed, the soft portion of the emulsion is removed and only the hardened portion remains, forming a printing plate.

The position of the positive film 9 in close contact with the transparent member 2 during the above-described exposure can be measured using the measurement lines 18 and 19 as a reference.

Furthermore, even if the transparent portion of the positive film 9 and the measurement lines 18, 19 are in the same position, the light passes through the etched measurement lines 18, 19, so when the light is projected onto the screen 9, it may have an adverse effect. The emulsion on the screen 9 is reliably hardened at the position corresponding to the transparent part without giving any turbulence.

Effects of the invention As detailed above, this invention consists of a transparent member provided in a support, a screen that is pressed against the transparent member through a positive film by vacuum suction, and is closely attached to the light-transmitting member by forming, by etching, measurement lines that are perpendicular to each other and have light-transmitting properties on the surface of the light-transmitting member on the positive film placement side opposite to the exposure side. When copying a positive film, it is possible to accurately determine the position of the positive film without adversely affecting the screen plate, and it is a practically preferred device because it has the excellent effect of preventing printing defects. be.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the vacuum baking frame of this invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a schematic front view showing measurement lines formed on a transparent member. FIG. 4 is an enlarged front view of the main part of FIG. 3, and FIG. 5 is an enlarged sectional view of the light-transmitting member. Support body...1, Transparent member...2, Screen...
...9, Positive film...10, Measuring line...
18,19.

Claims (1)

[Claims for Utility Model Registration] 1. A transparent member 2 provided in a support 1, and a screen 9 that is pressed against the transparent member 2 through a positive film 10 by vacuum suction.
In the vacuum baking frame, the light-transmitting member 2
positive film 10 on the side opposite to the exposure side of
A vacuum printing frame for producing a screen plate, characterized in that measuring lines 18 and 19, which are perpendicular to each other and have translucency, are formed on a surface 20 on the placement side by an etching method. 2. The vacuum printing frame for producing a screen plate according to claim 1, wherein the measurement lines 18 and 19 have a depth of several micrometers. 3. Screen plate production according to any one of claims 1 and 2, wherein the surface 20 of the transparent member 2 is dotted with etching points 21 in the etching treatment area. Vacuum baking frame for. 4. The measurement lines 18 and 19 have a width of 0.5 mm and are arranged with an interval of 1 cm from each other.Claim 2 of the Utility Model Registration
A vacuum printing frame for producing a screen plate according to any one of Items 1 and 3. 5. The transparent member 2 has a thickness of approximately 8 mm.Registered Utility Model Claims 1 to 4
A vacuum printing frame for producing a screen plate according to any one of the above items.