JPH04286648A - Thick film screen printing machine - Google Patents

Abstract

PURPOSE:To provide a screen printing machine performing thick film printing. CONSTITUTION:In a thick film screen printing machine, a scraper 4 is arranged between two flat squeezees 2, 3 to perform up-and-down movement by the flat squeezees and the scraper and a spring 5 is interposed between the scraper and the jig 6 fixing the scraper.

Description

[Detailed description of the invention]

0001

[Purpose of invention]

0002

FIELD OF INDUSTRIAL APPLICATION This invention relates to thick film printing using a screen printing machine.

0003

[Prior Art] Thick film screen printing is performed by an off-contact method in which a certain distance is maintained between the screen and the printing material. As shown in the figure, a flat squeegee 1 and a scraper 10 are moved up and down by cylinder 1, the scraper fills the screen pattern with ink, and the flat squeegee moves in the opposite direction to the scraper. A method is used in which ink filled in a screen pattern is transferred onto a printing substrate while moving.

[0004] The printing state can be explained with reference to FIG.
As shown in a), the scraper 10 is lowered onto the screen 12, and the ink 13a placed on the screen 12 fills the pattern of the screen 12 with the ink 13b as the scraper 10 moves to the right.

Next, as shown in (b), at this position, the scraper 10 is raised and the flat squeegee 11 is lowered to press the screen 12 against the printing material 14.

Next, as shown in (c), the flat squeegee 11
transfers the ink 13a filled in the pattern of the screen 12 onto the printing material 14 while moving to the left (13
c) Do.

Next, as shown in (d), the squeegee 11 is raised at this position, and the next printing begins.

As explained above, this printing method has a problem in that only one sheet can be printed in one reciprocating movement, which is the sum of the one-way movement of the scraper 10 and the one-way movement of the squeegee 11.

[0009] Furthermore, there is an on-contact printing method in which there is no space between the screen and the printing material, which is used when printing is performed with two flat squeegees without a scraper (
There is also a double squeegee (double squeegee), but since there is no step of filling the screen pattern with ink using a scraper, it is not suitable for thick film printing using low viscosity ink.

0010

[Problems to be solved by the invention] This invention aims to increase productivity by printing a large amount of printed matter in an off-contact type thick film screen printing machine that maintains a certain distance between the screen and the printing material. The technical challenge is to do so.

[0011]

[Structure of the invention]

0012

[Means for Solving the Problem] In a thick film screen printing machine having a certain distance between the screen and the printing material, two flat squeegees are provided, a scraper is arranged in the center, and the flat squeegee This is a thick film screen printing machine in which the scraper moves up and down with a cylinder and a spring is inserted between the scraper and the jig that fixes the scraper.

[0013]

[Operation] With two flat squeegees, the left squeegee and center scraper work in the right direction, and the left squeegee and center scraper work in the left direction, making it possible to print two thick films in one reciprocation. , which uses the elasticity of a spring to press the scraper against the screen.

[0014] Regarding the vertical movement of the flat squeegee, each
It is operated by operating individual cylinders, and the angle of the flat squeegee can also be adjusted freely.

[0015]

[Example] Examples will be explained below.

FIG. 1 shows two flat squeegees 2 according to this embodiment.
, 3 and one scraper 4. FIG.

In FIG. 1, two flat squeegees 2 and 3 sandwiching a scraper 4 are fixed so that they can move with each other at the same arbitrary angle.

The scraper 4 and the jig 6 are attached via a spring 5. The air cylinders 1a and 1c on the flat squeegees 2 and 3 are used to raise and lower the flat squeegees 2 and 3 and to press the screen 7.

The air cylinder 1b above the scraper 4 is for raising and lowering the scraper 4, and the pressure of the scraper 4 against the screen 7 is caused by the scraper 4 and the jig 6.
The elastic force of the spring 5 between is used.

Each printing process by a screen printing machine using the above configuration will be explained with reference to FIGS. 4(a) to 4(f).

In (a), the flat squeegee 3 is separated from the screen 7 by a certain distance, the flat squeegee 2 presses the screen 7 against the printing material 8, and the scraper 4 is operated by the elastic force of the spring 5 between the scraper fixing jigs. As the printing mechanism moves to the right, the ink 9a placed on the right side of the scraper 4 is transferred to the screen 7.
Fill the pattern as shown in 9b.

As shown in (b), the flat squeegee 2 transfers the ink 9b filled in the pattern of the screen 7 onto the printing material 8 (9c), and the flat squeegee 2 and scraper 4 separate from the screen 7 at this position. . The printing mechanism continues to move a predetermined distance to the right.

As shown in (c), the ink 9a is positioned on the left side of the scraper 4, and this state is one cycle of printing.

As shown in (d), next, the flat squeegee 3 presses the screen 7 against the printing material 8, the scraper 4 descends a certain distance again, and the printing mechanism moves to the left, thereby removing the scraper. Ink 9 placed to the left of 4
Ink 9b filled with a in the pattern of screen 7
is transferred onto the printing material 8, and as shown in (9c) and (f), the flat squeegee 3 and scraper 4 move away from the screen 7 at this position, and the printing mechanism moves a predetermined distance to the left to start the next printing. Move to.

As explained above, one-way movement of the printing mechanism can print one sheet, and reciprocating movement can print two sheets, thereby improving productivity.

[0026]

[Effects] The present invention can print one sheet by one-way movement of the flat squeegee and scraper in the same direction, so productivity is improved compared to conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a simplified explanatory diagram of a printing mechanism of this embodiment.

FIG. 2 is an explanatory diagram of a conventional printing mechanism.

FIG. 3 is an explanatory diagram of a printing process according to a conventional example. (a)
is before printing, (b) is when printing starts, (c) is before printing ends, (
d) shows each step of printing completion.

FIG. 4 is an explanatory diagram of the printing process according to this embodiment, in which (a) is a printing start process when the squeegee moves to the right; (b) is (a)
(c) is the process of completing printing, (d) is the process of starting printing when the squeegee moves to the left, (e) is (d)
(f) shows the process before the end of printing, and (f) shows the end process of printing.

[Explanation of symbols]

1a, 1b, 1c Cylinder 2, 3 Flat squeegee 4 Scrapper 5 Spring 6 Jig 7 Screen 8. Printing material

Claims (1)

[Claims] Claim 1: In a thick film screen printing machine having a certain distance between the screen and the printing target, two flat squeegees are provided, a scraper is arranged in the center, and the flat squeegees and the scraper are Moves up and down with a cylinder,
Thick film screen printing in which a spring is inserted between the scraper and a jig that fixes the scraper.