JP7706741B2 - Screen printing apparatus and screen printing method - Google Patents

Description

The present invention relates to a screen printing device and a screen printing method.

Screen printing devices that use screen plates have existed for some time.

JP 2001-315304 A

The present invention provides a screen printing device and clean printing method that can properly supply ink and accurately print patterns.

The screen printing apparatus of the present invention comprises:
In a screen printing apparatus for performing screen printing using a squeegee and a scraper,
a screen plate having a screen;
The ink jet recording apparatus is provided with a control unit which performs printing with the squeegee in a state where an ink pool is removed from the front of the squeegee in the printing direction, and coats the ink with the scraper in a state where an ink pool is formed in front of the scraper in the coating direction.

According to the present invention, the squeegee prints using ink coated by the blade, allowing for an appropriate amount of ink to be supplied.

FIG. 1 is a front view of a screen printing apparatus 100 according to a first embodiment. FIG. 1 is a plan view of a screen printing apparatus 100 according to a first embodiment. 4 is a flowchart of a printing method according to the first embodiment. 3 is an explanatory diagram of a printing method according to the first embodiment. 3 is an explanatory diagram of a printing method according to the first embodiment. 3 is an explanatory diagram of a printing method according to the first embodiment. 3 is an explanatory diagram of a printing method according to the first embodiment. 3 is an explanatory diagram of a printing method according to the first embodiment. 3 is an explanatory diagram of a printing method according to the first embodiment. 3 is an explanatory diagram of a printing method according to the first embodiment. 11 is a flowchart of a printing method according to a second embodiment. FIG. 11 is an explanatory diagram of a printing method according to a second embodiment. FIG. 11 is an explanatory diagram of a printing method according to a second embodiment. FIG. 11 is an explanatory diagram of a printing method according to a second embodiment. FIG. 11 is an explanatory diagram of a printing method according to a second embodiment. FIG. 11 is an explanatory diagram of a printing method according to a second embodiment. FIG. 11 is an explanatory diagram of a printing method according to a second embodiment. FIG. 11 is an explanatory diagram of a printing method according to a second embodiment. FIG. 11 is a front view of the screen printing apparatus 100 according to the third embodiment. FIG. 11 is a front view of the screen printing apparatus 100 according to the third embodiment.

The following explanation will be given using symbols, but these symbols do not limit the scope of the claims.

Embodiment 1.

***Description of General Configuration of Screen Printing Apparatus 100***
FIG. 1 is a side view of a screen printing apparatus 100 using a screen plate 50. As shown in FIG.
FIG. 2 is a plan view of a screen printing apparatus 100 using the screen plate 50. As shown in FIG.
1 and 2, P is the printing direction relative to the workpiece 101.
1 and 2, Q is the coating direction of the ink 91.

Control unit 30
The screen printing apparatus 100 has a control unit 30 .
The control unit 30 is an electronic device having a central processing unit, a memory, a storage device, and a program.
The control unit 30 controls the printing unit 40 via a signal line 31 .
The control unit 30 controls the squeegee lifting unit 61 , the scraper lifting unit 71 , and the handler driving unit 82 via a signal line 31 .

The printing method provided by the screen printing device 100 is realized by the control unit 30 controlling the printing unit 40, the squeegee lifting unit 61, the scraper lifting unit 71, and the handler driving unit 82.

●Printing department 40
The screen printing apparatus 100 has a printing unit 40 .
The printing unit 40 is guided by a guide 41 and moves in the horizontal direction.
The printing unit 40 has a squeegee lifting unit 61 , a scraper lifting unit 71 , and a handler driving unit 82 .
The squeegee lifting unit 61 moves the squeegee 60 up and down.
The scraper lifting unit 71 moves the scraper 70 up and down.
The handler drive unit 82 moves the scooping unit 81 up, down, left and right.

●Screen version 50
The screen plate 50 has a screen frame and a screen 51 .
The screen 51 has a printed pattern.

● Squeegee 60
The screen printing apparatus 100 includes a squeegee 60 .
The squeegee 60 pushes the ink 91 from the upper surface to the lower surface of the screen 50 .
The squeegee 60 is a spatula made of rubber or urethane.

● Scraper 70
The screen printing apparatus 100 has a scraper 70 that coats the upper surface of the screen 50 with ink 91 .
The scraper 70 is disposed to the left of the squeegee 60 .
The scraper 70 is a flat plate made of stainless steel or other metal.
The scraper 70 has a rectangular plate at the bottom.

Ink Handler 80
The screen printing apparatus 100 has an ink handler 80 that scoops up the ink puddle 90 .
The ink handler 80 is disposed to the left of the squeegee 60 .
The ink handler 80 includes a scraper 70 and a scooping portion 81 .
The scooping portion 81 is disposed between the squeegee 60 and the scraper 70 .
The scooping portion 81 is a flat plate made of stainless steel or other metal.
The scooping portion 81 has a rectangular plate at the bottom.
The scooping portion 81 sandwiches the ink puddle 90 between itself and the scraper 70 and scoops up the ink puddle 90 .

● Ink reservoir 90
The ink pool 90 is a mass of ink 91 .
Ink 91 in the ink pool 90 is coated onto the upper surface of the screen 51 by the scraper 70 .
The ink 91 may be a paste, cream solder, dye, or any other viscous liquid substance.

***Screen printing method explanation***
The screen printing method will be described with reference to FIGS.
The following operation is realized by the control unit 30 controlling the printing unit 40, the squeegee lifting unit 61, the scraper lifting unit 71, and the handler driving unit 82.

● Step S11. Coating process (Figure 4)
As shown in FIG. 4, an ink reservoir 90 is located in front of the scraper 70 in the coating direction.
The scraper 70 coats the screen 50 with ink while forming an ink puddle 90 in front of it in the coating direction.
The scraper 70 coats the upper surface of the screen 51 with ink 91 .
The scraper 70 coats the screen 51 with the ink 91 while embedding the ink 91 into the screen 51 .
The scraper 70 fills the print pattern with at least a sufficient amount of ink 91 for printing.

Step S12: Lowering process of the scooping part 81 (FIG. 5)
After the coating is completed, the scooping part 81 is lowered.

● Step S13. Scooping process (Figure 6)
The scooping portion 81 is moved to the left, and the ink pool 90 is sandwiched between the scraper 70 and the scooping portion 81 to scoop up the ink pool 90.

Step S14: Removal process of ink reservoir 90 (FIG. 7)
The scraper 70 and the scooping portion 81 are raised to lift up the ink reservoir 90.
The ink puddle 90 is lifted and the previous ink puddle 90 is removed by the squeegee 60 before printing.
At the same time, the squeegee 60 is lowered.

● Step S15. Printing process (Figure 8)
During printing, there is no ink puddle 90 in front of the squeegee 60 in the printing direction.
The squeegee 60 prints using only the ink coated by the scraper 70, without any ink pool in front of it in the printing direction.
The squeegee 60 prints only with the ink 91 embedded in the print pattern by the scraper 70 and the ink 91 coated thereon.

● Scraping ink 92
As shown in FIG. 8 , during printing, ink 91 scraped off by the squeegee 60 may accumulate in front of the squeegee 60 as scraped ink 92 .
The scraped ink 92 is a portion of the coated ink 91 and is excess ink that was not used in printing.
The scraped ink 92 is not actively generated, but is generated passively as printing proceeds.
The amount of ink 92 scraped off depends on the thickness of the coated ink 91 .
By adjusting the mounting height of the scraper 70 to change the gap between the upper surface and the scraper 70, the amount of ink 92 scraped off can be adjusted.

Step S16: Returning the ink reservoir 90 (FIG. 9)
After printing is completed, the squeegee 60 is raised.
At the same time, the scraper 70 and the scooping portion 81 are lowered, and the ink reservoir 90 is lowered.

Step S17: Returning the ink reservoir 90 (FIG. 10)
The scooping portion 81 is moved to the right, the ink puddle 90 sandwiched between the scraper 70 and the scooping portion 81 is released, and the ink puddle 90 is returned to the upper surface of the screen 51 .
Thereafter, steps S11 to S17 are repeated.

＊＊＊Explanation of printing method and print condition＊＊＊
● Ink reservoir 90
During coating, an ink puddle 90 forms only in front of the scraper 70 .
During printing, there is no ink puddle 90 in front of the squeegee 60 .
The squeegee 60 prints only with the ink 91 coated by the scraper 70 .
The squeegee 60 performs printing without using the ink 91 in the ink reservoir 90 .

Comparative Example 1 (ink pool 90 in front of squeegee 60)
If an ink puddle 90 is formed in front of the squeegee 60 during printing, printing will be performed using both the ink 91 coated by the scraper 70 and the ink 91 in the ink puddle 90 in front of the squeegee 60, which may result in printing with too much ink.

Comparative Example 2 (ink pool 90 in front of squeegee 60)
If an ink puddle 90 is formed in front of the squeegee 60 during printing, the amount of ink in the width direction of the ink puddle 90 (the direction perpendicular to the printing direction) is not constant, which may result in a difference in the amount of ink 91 filled in the width direction.
Even if an ink puddle 90 is not formed in front of the squeegee 60, the scraper 70 coats the ink 91 with a uniform thickness, so that the amount of ink 91 supplied in the width direction during printing can be made uniform.
Comparative Example 2 (scooping with squeegee 60)
When the ink puddle 90 is scooped up by the squeegee 60 and the scooping portion 81, printing and the movement of the ink puddle 90 cannot be performed at the same time.
Since the ink pool 90 is scooped up by the scraper 70 and the scooping portion 81, printing and movement of the ink pool 90 can be carried out simultaneously.

***Features of the First Embodiment***
The screen printing apparatus 100 of the first embodiment uses a screen plate 50 to print on a workpiece.
The control unit 30 performs printing with the squeegee 60 in a state in which the ink pool 90 is removed from the front of the squeegee 60 in the printing direction.
The control unit 30 causes the scraper 70 to coat the ink in a state in which an ink pool 90 is formed in front of the scraper 70 in the coating direction.

The ink handler 80 removes the ink pool 90 from the screen 50 and returns the ink pool 90 to the screen 50 .
The control unit 30 causes the ink handler 80 to remove the ink puddle 90 from in front of the squeegee 60 in the printing direction, and causes the ink handler 80 to return the ink puddle 90 to in front of the scraper 70 in the coating direction.

The ink handler 80 has a scooping portion 81 that scoops up the ink pool 90 .
The ink handler 80 scoops up the ink puddle 90 by pinching it between itself and the scraper 70 .

During printing, the control unit 30 moves the scooping unit 81 and the scraper 70 in the printing direction above the screen plate 50 with the ink puddle 90 sandwiched between the scooping unit and the scraper.
After printing, the control unit 30 releases the sandwiching between the scraper 70 and the scooping unit 81 and returns the ink pool 90 to the screen plate.

***Advantages of First Embodiment***
According to the screen printing apparatus 100 of the first embodiment, printing with an appropriate amount of ink is possible, and therefore accurate printing is possible.
For example, the amount of ink in front of the squeegee 60 becomes uniform in the width direction, eliminating any difference in the amount of ink.

The ink 91 is coated by the scraper 70, so the amount of ink 91 is optimal. An ink puddle 90 is formed in front of the scraper 70, and an ink puddle 90 is not formed in front of the squeegee 60, so the amount of ink is optimal.

Embodiment 2.
The following describes the differences from the first embodiment.
The second embodiment shown in FIGS. 11 to 18 differs in the configuration of the ink handler 80. In the second embodiment shown in FIGS.
While the ink handler 80 in the first embodiment has the scraper 70 and the scooping portion 81, the ink handler 80 in the second embodiment has a pair of scooping portions 81.

The pair of scooping units 81 are moved up, down, left and right by a handler driving unit 82 .
The distance between the pair of scooping units 81 is increased or decreased by a handler driving unit 82 .

***Screen printing method explanation***
The screen printing method will be described with reference to FIGS. 11 to 18, focusing on differences from the first embodiment.
The following operation is realized by the control unit 30 controlling the printing unit 40, the squeegee lifting unit 61, the scraper lifting unit 71, and the handler driving unit 82.

Step S11: Coating process (FIG. 12)
Same as embodiment 1.

Step S12: Lowering process of the pair of scooping parts 81 (FIG. 13)
After the coating is completed, the pair of scooping parts 81 are lowered.

● Step S13. Scooping process (Figure 14)
The pair of scooping parts 81 are moved so that the distance between them becomes narrower, and the ink pool 90 is sandwiched between the pair of scooping parts 81 to scoop up the ink pool 90.

Step S14: Removal process of ink reservoir 90 (FIG. 15)
The pair of scooping parts 81 are raised to lift up the ink reservoir 90 .
At the same time, the scraper 70 is raised and the squeegee 60 is lowered.

● Step S15. Printing process (Figure 16)
Same as embodiment 1.

Step S16: Returning the ink reservoir 90 (FIG. 17)
After printing is completed, the squeegee 60 is raised.
At the same time, the scraper 70 and the pair of scooping portions 81 are lowered, and the ink reservoir 90 is lowered.

Step S17: Returning the ink reservoir 90 (FIG. 18)
The distance between the pair of scooping parts 81 is widened to release the ink pool 90 sandwiched between the pair of scooping parts 81, and the ink pool 90 is returned to the upper surface of the screen 51.
Thereafter, steps S11 to S17 are repeated.

***Features of the Second Embodiment***
The ink handler 80 has a pair of scooping portions 81 that scoop up the ink pool 90 .
The ink handler 80 scoops up the ink puddle 90 by sandwiching it between a pair of scooping portions 81 .

With the ink pool 90 sandwiched between the pair of scooping parts 81, the control unit 30 moves the pair of scooping parts 81 in the printing direction above the screen plate 50.
The control unit 30 releases the pinching between the pair of scooping parts 81 in the coating direction of the scraper 70 and returns the ink puddle 90 to the screen plate 50 .

Embodiment 3.
The following describes the differences from the first and second embodiments.
In the third embodiment shown in FIG. 19, the positions of the scraper 70 and the ink handler 80 are different.
The scraper 70 in the second embodiment is located between the squeegee 60 and the scooping portion 81 .
The printing direction and the coating direction are the same.

***Screen printing method explanation***
The screen printing method will be described with reference to FIGS. 19 and 20, focusing on differences from the first embodiment.
As shown in FIG. 19, a screen printing apparatus 100 performs printing and coating simultaneously.
There is no ink puddle 90 in front of the squeegee 60 .
In front of the scraper 70 is an ink reservoir 90 .
The squeegee 60 prints immediately after the scraper 70 fills and coats the ink.
As shown in FIG. 20, after printing, the screen printing apparatus 100 moves the ink puddle 90 from left to right on the upper surface of the screen 51 by the ink return 83 .
The ink return 83 only moves the ink reservoir 90, but does not fill or coat it with ink.

***Features of the Third Embodiment***
The printing direction of the squeegee 60 and the coating direction of the scraper 70 are in the same direction.
An ink puddle 90 is formed in front of the scraper 70 in the coating direction, and the control unit 30 simultaneously performs coating by the scraper 70 and printing by the squeegee 60 with the ink puddle 90 removed from in front of the squeegee 60 in the printing direction.
After printing, the ink return 83 returns the ink puddle to the printing start position on the screen.

In addition, instead of using the ink return 83, the ink reservoir 90 may be lifted and moved by clamping it between a pair of scooping parts 81 as in embodiment 2.

*** Supplementary explanation of the embodiment ***
The above-described embodiments may be combined, or parts of the embodiments may be combined.

30 control unit, 31 signal line, 40 printing unit, 41 guide, 50 screen plate, 51 screen, 60 squeegee, 61 squeegee lifting unit, 70 scraper, 71 scraper lifting unit, 80 ink handler, 81 scooping unit, 82 handler drive unit, 83 ink return, 90 ink reservoir, 91 ink, 92 scraped ink, 100 screen printing device, 101 work.

Claims (9)

In a screen printing apparatus for performing screen printing using a squeegee and a scraper,
a screen plate having a screen;
The screen printing device is provided with a control unit which removes an ink puddle from the screen plate, prints with the squeegee in a state where the ink puddle is removed from the front of the printing direction of the squeegee, returns the ink puddle to the screen plate, and coats the ink with the scraper in a state where the ink puddle is formed in the front of the coating direction of the scraper. The screen printing device according to claim 1, wherein the squeegee prints only with the ink embedded and coated by the scraper. In a screen printing apparatus for performing screen printing using a squeegee and a scraper,
a screen plate having a screen;
a control unit that performs printing with the squeegee in a state where an ink pool is removed from the front of the squeegee in a printing direction, and that performs ink coating with the scraper in a state where an ink pool is formed in front of the scraper in a coating direction;
Equipped with
an ink handler for removing ink from the screen and returning the ink to the screen;
The control unit is a screen printing apparatus that causes the ink handler to remove the ink puddle from ahead of the squeegee in a printing direction, and causes the ink handler to return the ink puddle to ahead of the scraper in a coating direction. The ink handler has a scooping portion for scooping up the ink pool,
4. The screen printing apparatus according to claim 3, wherein the ink handler scoops up the ink puddle by pinching it between itself and the scraper. The control unit is
During printing, the scooping unit and the scraper are moved in a printing direction above the screen plate while an ink puddle is sandwiched between the scooping unit and the scraper;
5. The screen printing apparatus according to claim 4, wherein after printing, the sandwiching between the scraper and the scooping portion is released, and the ink pool is returned to the screen. The ink handler has a pair of scooping parts for scooping up the ink pool,
4. The screen printing apparatus according to claim 3, wherein the ink handler scoops up the ink puddle by sandwiching it between the pair of scooping portions. The control unit is
With the ink pool sandwiched between the pair of scooping parts, the pair of scooping parts are moved in a printing direction above the screen plate;
7. The screen printing apparatus according to claim 6, wherein the pair of scooping parts are released from the sandwiching relationship in the coating direction of the scraper, and the ink pool is returned to the screen. In a screen printing apparatus for performing screen printing using a squeegee and a scraper,
a screen plate having a screen;
a control unit that performs printing with the squeegee in a state where an ink pool is removed from the front of the squeegee in a printing direction, and that performs ink coating with the scraper in a state where an ink pool is formed in front of the scraper in a coating direction;
Equipped with
An ink returner that returns the ink pool to the screen,
a printing direction of the squeegee and a coating direction of the scraper are the same direction, an ink puddle is formed in front of the coating direction of the scraper, and in a state where the ink puddle is removed from in front of the printing direction of the squeegee, the control unit simultaneously performs coating by the scraper and printing by the squeegee;
A screen printing device that returns ink pools by the ink return. A screen printing method for performing screen printing using a squeegee, a scraper, and a screen plate, comprising:
This screen printing method includes removing an ink puddle from a screen plate, printing with the squeegee in a state where the ink puddle is removed from the front of the printing direction of the squeegee, returning the ink puddle to the screen plate, and coating the ink with the scraper in a state where the ink puddle is formed in the front of the coating direction of the scraper.

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