JPH0225793B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for fixing a printing material such as a printed wiring board (through-hole wiring board) having a large number of through holes, and placing a screen plate on the printing material to remove the printed wiring board. The present invention relates to a screen printing machine that performs screen printing on printed matter.

Prior Art In general, the printing process for wiring boards in the production of printed wiring boards is carried out by placing the wiring board on a suction cup of a printing machine that has many air intake ports, but industrial wiring boards, double-sided printed wiring boards, etc. At the beginning of the manufacturing process, holes are made for mounting circuit elements, and screen printing is performed to fit the holes. For this reason, if the intake port of the suction cup and the through hole of the wiring board overlap, the negative pressure inside the suction cup will decrease and the suction force of the wiring board will be weakened. It gets sucked in and makes it impossible to print accurately. In addition, the top surface and inside of the suction cup may become dirty due to the ink that has been sucked in.
There was a problem with cleaning being time consuming.

As a countermeasure to these problems, we used a method in which the through holes in the wiring board that coincided with the air intake ports were filled in advance with a filler, and the filler was removed after printing. However, this method requires a large number of man-hours, and there is a problem in that the wiring board is also prone to defects such as disconnection of the printed wiring.

Furthermore, since this conventional device uses a suction cup to fix the printed wiring board, it has disadvantages in that it consumes a lot of power, leading to a rise in running costs and generating noise.

Purpose of the Invention This invention was made in order to eliminate the above-mentioned defects, and its purpose is to reduce power consumption, prevent noise generation, and provide a large number of through holes. When printing on through-hole wiring boards, it is not necessary to fill the holes or remove the filler after printing, and the thickness of the ink layer is kept uniform regardless of the presence or absence of the holes. It is an object of the present invention to provide a screen printing machine which is capable of printing a screen and which is free from the possibility of its through holes being blocked by ink.

Structure of the Invention In order to achieve the above object, in the present invention, an adsorption layer made of dielectric synthetic resin is formed on the surface of a support base for fixedly supporting the printing material, and the printing material is statically placed on the adsorption layer. I try to use electrostatic adsorption.

Embodiment An embodiment embodying the present invention will be described below with reference to FIGS. 1 and 2. As shown in FIG. 1, the printing press main body 1 is composed of a base 2, a pedestal 3 erected on the pedestal 2, and a head 4 provided at the upper end of the pedestal 3. There is. A flat plate-shaped support 5 is disposed on the base 2. Also, head 4
is provided with a support arm 6 that is movable between a use position shown by a solid line in FIG. A pair of front and rear frames 8 are attached. Further, a well-known squeegee 9 and a doctor 10 that can move back and forth and up and down on the screen plate 7 are disposed on the operating arm 6.
Then, the through-hole wiring board 1 is placed on the support stand 5.
1 is fixed and the actuating arm 6 is placed in the use position shown by the solid line in FIG. By coating the through-hole wiring board 11 according to the shape of the screen plate 7, printing is performed. Thereafter, the doctor 10 is operated to uniformly apply ink onto the screen plate 7.

Next, the structure for fixing and holding the through-hole wiring board 11 will be explained. As shown in FIG. It consists of Further, the intermediate layer constitutes an electrode layer 13 made of a conductive synthetic resin, and a positive electrode 13a and a negative electrode 13b are arranged on this electrode layer 13 at a predetermined interval. The uppermost layer constitutes an adsorption layer 14 made of dielectric synthetic resin.

Each of the positive electrodes 13a is connected to the DC power source 1.
A switch 16 is connected between the DC power source 15 and the electrode layer 13, and the negative electrode 13b is connected to the negative terminal.
is connected.

Therefore, the through-hole wiring board 11 is placed on the support stand 5.
When the switch 16 is turned on and a voltage is applied between each electrode 13a and 13b, a dielectric polarization phenomenon occurs in the adsorption layer 14, and each electrode 13
Charges of opposite signs on a and 13b are excited in the adsorption layer 14, and the through-hole wiring board 11 and its adsorption layer 1
An electrostatic force is generated between the Therefore, the electrostatic force causes the through-hole wiring board 11 to stick to the adsorption layer 14.
is instantly adsorbed and held in that state.

In this state, when the squeegee 9 is operated and ink is applied to the through-hole wiring board 11, the ink enters the through-holes of the through-hole wiring board 11 and blocks the through-holes because there is no air suction action. There is no risk that the ink will smear or the thickness of the ink coating layer will become uneven, and a printed surface with a good finish can be formed. Furthermore, since there is no need to provide an air suction cup, power consumption can be saved. Furthermore, since it is not necessary to fill the holes in the through-hole wiring board or to remove the filler after printing, not only can the number of printing steps be reduced, but also stains caused by the filler can be prevented.

Effects of the Invention As detailed above, in this invention, an adsorption layer made of dielectric synthetic resin is formed on the surface of the support.
This not only reduces power consumption and reduces running costs, but also provides excellent effects in that uniform and accurate printing can be performed on the printing material.

[Brief explanation of drawings]

FIG. 1 is a side view of a screen printing machine embodying the present invention, and FIG. 2 is an enlarged side sectional view of a part of the support base. In the figure, 5 is a support stand, 7 is a screen plate, and 9
1 is a squeegee, 11 is a through-hole wiring board, 14 is an adsorption layer, and 15 is a DC power source.

Claims (1)

[Scope of Claims] 1. In a screen printing machine that performs screen printing on a printed wiring board 11 or the like by placing a screen plate 7 on the printed wiring board 11 or the like in a fixed state, the printing material is fixedly supported. A screen printing machine characterized in that an adsorption layer 14 made of a dielectric synthetic resin is formed on the surface of a support base 5 for printing, and the substrate to be printed is electrostatically adsorbed on the adsorption layer 14.