JPH0221942B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of printing by ensuring that a thin plate material for a printed circuit board that is continuously and automatically conveyed onto a printing table is positioned at a predetermined position for printing on the printing table. Regarding screen printing machines,
To explain this in more detail, it uses negative pressure suction force to secure the material at a predetermined position on the printing table. Concerning improvements to screen printing machines that have brought about promising results.

Conventionally, in screen printing machines that print electrical circuits in a predetermined pattern by continuously and automatically positioning material that is continuously and automatically introduced onto a printing table at a predetermined position for printing, a large number of perforations are made on the entire surface of the printing table. In many cases, the material is secured at a predetermined printing position on the printing table by means of negative pressure suction from small ventilation holes. When handling small-sized materials using a device with ventilation holes drilled all over the printing table surface, there will be areas on the printing table surface where the surface of the material does not come into contact, and it is wasteful to suction negative pressure in those areas. become. In this way, negative pressure suction in unnecessary parts also reduces the suction force in other parts, which is a big negative factor.
In addition, when handling materials with a considerable number of through-holes, the conventional negative-pressure suction structure on the printing table surface requires the appropriate negative-pressure suction force to be applied to the desired part of the through-hole-forming material. It is impossible to make it work. In view of the prior art as described above, the present invention provides a screen printing machine that can easily and quickly supply negative pressure suction force to the parts on the printing table that require it, thereby efficiently securing the printing position. It is intended to realize the following.

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a schematic top view illustrating the screen printing machine just before the thin plate material M for printed wiring boards is carried onto the printing table 1; printing table 1
It is a conveyor belt that is carried upwards and sent to the subsequent process after the printing process is completed, and is designed to sink into the groove 3 of the printing table 1 during printing and to be exposed above the groove 3 after printing is completed. . In addition, in the figure, 4 is material M
This is a stopper that regulates the position of the printing table in the direction of movement, and it retracts from one surface of the printing table during printing.
Reference numerals 5a and 5b are position regulating members for regulating the position of the material M in the straight direction with respect to the traveling direction, and the movable position regulating member 5b is relative to the fixed position regulating member 5a.
moves in the direction of the arrow to regulate the position of the material M in the direction perpendicular to the direction of movement. The material M whose position is regulated on the printing table 1 is maintained in that state by negative pressure suction as will be described in detail later, and the squeegee SQ runs on the screen plate SC surface to screen print a predetermined electric circuit. (See Figure 3).

As mentioned earlier, a plurality of grooves 3 are provided at appropriate intervals on one surface of the printing table.
is facing in the direction of movement of material M. Further, it is preferable that the interval is as small as possible.

Also, inside each groove 3, there is a small hole or
A slit-shaped negative pressure suction port 6 is bored (fourth
1 to 4 (see FIG. 3), but the negative pressure suction port 6 is not limited to these shapes, and if necessary, negative pressure can be supplied from a separately installed vacuum pump (not shown) through the supply path 7. It may be any type as long as it can supply air, and it may also have small holes and slits (see Fig. 4, 3).

FIG. 5 illustrates the suction member 8 and the closing member 9 for selecting the negative pressure suction port 6 in the groove 3 at a desired position. A pore 8a is provided, and a concave space 10 is formed at the bottom facing the suction port 6.

By forming the bottom of the suction member 8 facing the negative pressure suction port 6 into a concave space 10, suction members 8 having different numbers of ventilation holes 8a and different intervals can be obtained.
The number of negative pressure suction ports 6 formed in the grooves 3 can be adjusted as appropriate depending on the position of each groove 3, and there is an advantage that efficient negative pressure suction action can be expected.

The closing member 9 may be any member as long as it can close the negative pressure suction port 6, and may not be used as the suction member 8 or separately.
It doesn't have to be an independent entity. Also, both 8,
Although the shape and size of the printing plate 9 may be determined as appropriate, it is preferable to form the printing plate 9 so that its surface is parallel to the surface of the printing table.

The installation position of the negative pressure suction port 6 is not necessarily limited to the bottom surface as long as it is inside the groove 3, and may be provided on the side wall surface of the groove 3 as shown in FIG. In this case, there is an advantage that the groove 3 does not have to be a bottomed groove, but the suction member 8 and the closing member 9 must be held within the groove 3 by some means S.

Note that FIGS. 7 to 11 are explanatory diagrams relating to the adsorption member separately, and this adsorption member 11 is connected to the ventilation hole 11b from a vacuum pump (not shown) via a flexible hose 11a. It supplies negative pressure air through the groove 3, and is movable within the groove 3. In this example, there is no need for a closing member like in the previous example, and there is also a negative pressure suction port 6 in the groove 3.
This eliminates the need to drill holes. Further, in this example as well, the groove 3 in which the suction member 11 moves does not have to be a bottomed groove, and the flange portion that supports the suction member 11 may be left and its bottom portion may be a vacant space 3a. When the bottom part is made into a hollow space 3a, there is an advantage that the negative pressure air supply hose 11a can be conveniently stored as the suction member 11 moves (see FIGS. 9 and 10).

As described above, the present invention includes a suction member having negative pressure suction ports formed in grooves formed at intervals on the printing table surface, a suction member having a ventilation hole communicating with the negative pressure suction ports, and a suction member having a ventilation hole communicating with the negative pressure suction ports. Since the structure consists of a structure in which a suitable combination of closing members are installed in the groove, a negative pressure suction effect on the material can be easily expected at a desired position on the printing table, and it is possible to easily apply a negative pressure suction effect to the material at a desired position on the printing table. It has now become possible to realize a screen printing machine that can efficiently secure the printing position of through-hole material on the printing table.

[Brief explanation of drawings]

Fig. 1 is a partially omitted top view illustrating the outline of a printing press according to the present invention, and Fig. 2 shows a negative pressure suction port provided in a groove of a printing table, and a suction member and a closing member for this negative pressure suction port. 3 is a schematic illustration of the relationship between the printing table, the materials on the printing table, and the screen plate, and FIGS. 4 1 to 3 are negative pressure suction ports. 5 is an explanatory diagram of an example of the suction member and the closing member; FIG. 6 is an explanatory diagram of a modified example of the groove, the negative pressure suction port, and the suction member;
FIGS. 7 to 11 are explanatory diagrams of other examples of grooves and adsorption members. 1...Printing table, 2...Transport belt, 3...
Groove, 6...Negative pressure suction port, 8...Adsorption member, 8a...Vent hole, 9...Closing member, 10...Concave space.

Claims (1)

[Claims] 1. In a screen printing machine that performs the printing process by positioning the material that is continuously and automatically carried onto the printing table at a predetermined position for printing on the printing table, there is a screen on the printing table surface facing the direction of movement of the material. A plurality of grooves are provided, negative pressure suction ports are bored inside the grooves, and a suction member having a ventilation hole communicating with the negative pressure suction ports and a closing member for closing the negative pressure suction ports are appropriately combined to form the grooves. A screen printing machine characterized by being installed inside.