JPS61209158A - Method and device for screen printing - Google Patents

Abstract

PURPOSE:To enable a mark of a printed matter remaining on a mesh of a screen to be removed to achieve low-cost, by a method wherein the screen is slid by being held between upper and lower squeegees. CONSTITUTION:A pallet 50 loading a printed matter is so transferred as to be removed from the position under a screen 30. The screen 30 is slid in the direction of arrows shown by full lines with being held between a first upper squeegee 16 and a first lower squeegee 27. After the first upper squeegee 16 is moved upward as well as the first lower squeegee 27 downward, a second upper squeegee 17 is moved downward as well as a second lower squeegee 28 upward to hold the screen 30 therebetween when the screen 30 is slid in the direction of arrows as shown by broken lines, thus resulting in removal of a mark of a printed matter remaining on the screen 30 after a printing process is finished. Accordingly, the mark of the printed matter remaining on the mesh of the screen can be removed by sliding the squeegees not by employing a paper, thereby enabling low-cost and substantial improvement of operational efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screen printing method and a screen printing apparatus, and in particular, to a method for removing print marks left on the mesh of a screen after transferring a print onto a printing substrate using a special process. The present invention relates to a screen printing method and a screen printing device in which the screen is removed only by the sliding operation of a squeegee without adding.

For example, in screen printing that involves painting the surface of a case of a light-emitting display device black or forming a thick film on a glass substrate or printed circuit board, paint or conductive paste may be applied to the mesh of the screen after the printing process is completed. If print marks remain,
Due to the print marks, the amount of printed matter to be transferred to the next printed material varies, causing printing defects such as printing blur.

Conventionally, therefore, a suitable piece of paper is placed on the underside of the screen, and the print marks are transferred to the paper and removed by sliding the screen with a squeegee in the same way as in the printing process.

(°ゝAccording to this conventional method, it is necessary to add the work of placing the paper under the screen and the work of ejecting the paper after the printing process, which is extremely troublesome and causes a decrease in work efficiency. Furthermore, since the paper blank is a consumable item, it is disadvantageous in terms of cost.

The present invention was devised in view of the above-mentioned problems, and provides a screen printing method and a screen printing device that remove print marks remaining on the screen mesh after the printing process in a simple manner and are advantageous in terms of cost. The purpose is to

The screen printing method according to the first invention includes the steps of placing a printed material at a predetermined position on the lower surface of a screen on which a predetermined pattern is formed, placing an appropriate amount of printed material on the upper surface of the screen, and placing the printed material on the upper surface of the screen. Sliding the upper surface of the screen with a squeegee so that the printed material passes through the screen to transfer the printed material onto the printing material, and moving the printed material from a position below the screen to the screen. a step of abutting an upper squeegee and a lower squeegee from the upper and lower surfaces, respectively, and performing a sliding operation while holding the screen between the upper and lower squeegee to remove print traces left on the mesh of the screen during transfer of the printed material; The reason is that it is equipped with the following.

On the other hand, a screen printing apparatus according to a second aspect of the present invention includes a first vertical drive means for vertically raising and lowering a first and a second upper squeegee, respectively, with respect to the upper surface of the screen; 2. An upper squeegee drive mechanism including a first back and forth drive means for horizontally moving the upper squeegee, and a second vertical drive for moving the first and second lower squeegees up and down, respectively, with respect to the lower surface of the screen. a lower squeegee drive mechanism including a means for moving the first and second lower squeegee horizontally relative to the screen, and a lower squeegee drive mechanism that interlocks the upper squeegee drive mechanism and the lower squeegee drive mechanism. The present invention is provided with a connecting mechanism for connecting.

Embodiments of the present invention will be described in detail below with reference to the drawings. The outline of the screen printing device according to the second invention is explained in the first part.
It is shown in a perspective view in the figure. That is, the screen printing device 1
includes an upper squeegee drive mechanism 10, a lower squeegee drive mechanism 2o, and a connection mechanism.

Specifically, the upper squeegee drive mechanism 1o includes a horizontally disposed pipe shaft 11 and a slider made of a magnetic material that is slidably housed inside the pipe shaft 11. A rodless cylinder 12 made of a magnetic material is slidably attached to the outer periphery of the rodless cylinder 11, a substantially rectangular base 13 is fixed to the lower surface of the rodless cylinder 12, and a rodless cylinder 12 is fixed to the lower surface of the base 13. first and second cylinders 14.14 provided therein; a first upper squeegee 16 and a second upper squeegee that are vertically movably attached to rods projecting downward from the first and second cylinders 14.14; 17, and a cylinder 18a erected on an L-shaped bracket attached to the side surface of the base 13. That is, the pipe shaft 11 and the rodless cylinder 12 constitute a first longitudinal drive means, and the first and second cylinders 14.14
This constitutes the first vertical drive means.

The upper squeegee drive mechanism 10 sends air into the pipe shaft 11 from the direction of arrow A or B, moves the slider, and moves the rodless cylinder 12 in the direction of arrow C.
Alternatively, it is horizontally moved along the pipe shaft 11 in the D direction. Further, the cylinder 18a engages a substantially circular connecting piece 18c fixed to the tip of the rod 18b projecting downward with a guide groove 23c formed on the side surface of the slide unit 23 of the lower squeegee drive mechanism 20. The upper squeegee drive mechanism 10 and the lower squeegee drive mechanism 20 are interlocked and connected. That is, the cylinder 18a, the rod 18b, the connecting piece 18c, and the guide groove 23c constitute a connecting mechanism. The tips of the first and second upper squeegees 16, 17 have a substantially oblique cross section.

On the other hand, the lower squeegee drive mechanism 20 includes slide shafts 21 and 22 disposed parallel to the pipe shaft 11.
A first and a second slide unit 23.24 are slidably attached to the slide shaft 2L 22, respectively, and a second slide unit 23.24 is fixed to a predetermined position on the lower surface of the first and second slide units 23.24. 1 cylinder 2381 2nd cylinder 23b1 3rd cylinder 248. The rods protruding downward from the fourth cylinder 24b, the first cylinder 23a and the third cylinder 24a, respectively, and the second cylinder 23
first and second connecting bars 25 and 26 that connect the rods protruding downward from the cylinder b and the fourth cylinder 24b, respectively, and the first and second connecting bars 2
5.26, first and second lower squeegees 27 and 28 are respectively provided upright at predetermined positions on the upper surface. That is, the first cylinder 23a, the second cylinder 23b, the third cylinder 24a, the fourth cylinder 24b, and the first and second connecting bars 25 and 26 constitute a second vertical drive means, and the slide The shaft 21.22 and the first and second slide shafts 23.24 constitute a second longitudinal drive means. The first and second lower squeegees 27, 28 are raised and lowered by the first cylinder 23a and the third cylinder 24a, and by the second cylinder 23b and the fourth cylinder 24b, respectively. Furthermore, the first and second lower squeegees 27.28
The upper end has a generally elliptical cross-section, and a printed matter cover 29 is attached to each side with a screw.

The screen 30 indicated by the dashed line has a predetermined pattern formed thereon, and is formed with the upper squeegee drive mechanism 1.
0 and the lower squeegee' drive mechanism 20.

Furthermore, the belt conveyor 40 shown by the two-dot chain line consists of belts 41.41 arranged in parallel at predetermined intervals, and pulleys 42 meshed to rotate the belts 41.41 at the same speed. . This belt conveyor 40 is disposed in a direction perpendicular to the pipe shaft 11 of the upper squeegee drive mechanism 10, and is disposed corresponding to the main surface position of the screen 30. Further, a bushing rod 70 shown in FIG. 2 is used to raise and lower the pallet 50 guided by the belt conveyor 40 to a predetermined position below the screen 30 so as to come into contact with or approach the lower surface of the screen 30 from below. It is.

Using the screen printing device 1 configured as described above, the first
The screen printing method according to the invention will be explained below.

First, printing materials are regularly placed on the upper surface of a pallet 50 sent from the elevator 60, and the pallet 50 is conveyed to below the screen 30 by the belt conveyor 40 (see FIG. 2). After that, the pallet 50
Then, the first upper squeegee 16 is raised to the lower surface of the screen 30 at a predetermined distance using the bushing rod 70. Next, the first upper squeegee 16 is moved up to the screen as shown in FIG. The first upper squeegee 16 moves the base 13 in the direction of arrow C in FIG. Slide the screen 30. Furthermore, after raising the first upper squeegee 16, the second upper squeegee 16 is raised.
Lower the upper squeegee 17 so that it comes into contact with the screen 30, and contrary to the above, air at a predetermined pressure is supplied to the pipe shaft 11 from the direction of arrow B in FIG. 1, and the base 13 is moved in the direction of the arrow in FIG. Possibly the second upper squeegee 17
to slide the screen 30 (see FIG. 3(a)).

After completing the printing process in one round trip in this manner, the pallet 50 on which the printing material is placed is conveyed to be removed from below the screen 30 in order to send the printing material to the printing drying and baking line.

Thereafter, the process of removing print marks left on the mesh of the screen, which is the main part of this screen printing method, will be explained below with reference to FIG. 1 and FIG. 3(b). First, the first
The first lower squeegee 27 is raised to contact the lower surface of the screen 30 by the first cylinder 23a and the third cylinder 24a of the second slide unit 23.24. The first upper squeegee 16 is lowered using the first cylinder 14 so as to come into contact with the upper surface of the screen 30. In this way, the first upper squeegee 16 and the first lower squeegee 27
The screen 30 is clamped and slid as shown by the solid line in FIG. 3('b). Then, the first upper squeegee 1
6 is raised and the first lower squeegee 27 is lowered, and then the second upper squeegee 17 is lowered and the second lower squeegee 28 is raised in the same manner as described above.
While holding the screen 30 between the upper squeegee 17 and the second lower squeegee 28, the screen 30 is slid as shown by the broken line in FIG. 3(b). This removes print marks from the screen 30 after the printing process is completed. Incidentally, since the upper squeegee drive mechanism 10 and the lower squeegee drive mechanism 20 are interlocked and connected by a coupling mechanism, the movement is performed as described above. The removed print traces are removed from the print traces 2 disposed on the sides of the first and second lower squeegees 27 and 28, respectively.
Collected at 9.

The first invention is not limited to being applied to the screen printing apparatus 1 described in detail in the second invention as described above, and in short, the first invention is not limited to the screen printing apparatus 1 that is applied to the screen printing apparatus 1 described in detail in the second invention. Any device may be used as long as it is capable of removing print marks left on the mesh of the screen after the printing process by holding and sliding the screen with a pair of squeegees.

As explained in detail above, the first invention does not use paper as in the past to remove print marks left on the mesh of the screen after the printing process, so there is no need for unnecessary paper feeding and ejection. There is no need to add any additional work.

In other words, it is possible to simplify the work and reduce costs.

On the other hand, according to the second invention of the present invention, the series of operations for removing print marks left on the mesh of the screen by sliding the squeegee as described above is extremely simple, and work efficiency can be greatly improved. .

As described above, the present invention has significant practical effects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a screen printing apparatus according to the present invention, FIG. 2 is an explanatory diagram for explaining the movement of the pallet 50, and FIG. 3(a) is an explanatory diagram for explaining the movement of the upper squeegee in the printing process. Explanatory drawing, Fig. 3) is an explanatory drawing for simply explaining the movement of the upper and lower squeegees in the process of removing print marks left on the mesh of the screen. DESCRIPTION OF SYMBOLS 1... Screen printing device, 10... Upper squeegee drive mechanism, 16... First upper squeegee, 17... Second upper squeegee, 20... Lower squeegee drive mechanism, 2
7... First lower squeegee, 28... Second lower squeegee, 30... Screen, 40... Belt conveyor, 70... Bush rod. Patent Applicant: ROHM Co., Ltd. Agent, Patent Attorney: Takaharu Ohnishi Figure 2, Figure 3

Claims (2)

[Claims] (1) A step of placing a printed material at a predetermined position on the lower surface of a screen on which a predetermined pattern is formed, placing an appropriate amount of printed material on the upper surface of the screen, and moving the printed material onto the screen using an upper squeegee so that the printed material passes through the screen. a step of transferring the printed material to the printing substrate by sliding the upper surface; moving the printing substrate from a position below the screen and abutting an upper squeegee and a lower squeegee from the upper and lower surfaces of the screen, respectively; A screen printing method comprising the step of removing print marks left on the mesh of the screen during transfer of the print by holding and sliding the screen between upper and lower squeegees. (2) a first vertical drive means that moves the first and second upper squeegees up and down, respectively, with respect to the upper surface of the screen; and a first vertical drive means that moves the first and second upper squeegees horizontally, respectively, with respect to the screen; an upper squeegee drive mechanism including a first and second front and back drive means; a second vertical drive mechanism that moves the first and second lower squeegee up and down, respectively, with respect to the lower surface of the screen; and a lower squeegee drive mechanism including second front and rear drive means for horizontally moving the second lower squeegee, and a connection mechanism that interlocks and connects the upper squeegee drive mechanism and the lower squeegee drive mechanism. Features of screen printing equipment.