JPH0785930B2 - Screen mask cleaning device - Google Patents

Description

The present invention relates to an apparatus for cleaning the back surface of a screen mask in a screen printing machine.

(B) Prior art When cleaning the back surface of the screen mask of a screen printing machine with a cleaning member, conventionally, a highly hygroscopic paper is used as the cleaning member and the cleaning member is pressed against the back surface of the screen mask. In addition, it was moved while being pressed, and thereby wiped off.

However, in such a method, there is a possibility that the fiber waste of the paper adheres to the screen mask and mixes with the paste to be printed to stain the paste, and the pressing force on the back surface of the screen mask is applied repeatedly more than necessary. Therefore, there is a problem that the tension of the screen mask is lowered and the life of the screen mask is shortened.

(C) Problem to be Solved by the Invention The problem to be solved by the present invention is to prevent the attachment of fiber waste of paper by cleaning the screen mask with a cleaning cloth with a solvent and to attach the stopper member to the frame of the screen mask. It is an object of the present invention to provide a cleaning device that limits the pressing of the screen mask by bringing it into contact with each other.

(D) Means for Solving the Problem The invention of the present application is an apparatus for cleaning a screen mask by bringing a cleaning member into contact with the surface of the screen mask, and the cleaning member is composed of a cleaning cloth wound in a roll shape. The cleaning device presses the cleaning cloth against the lower surface of the screen mask with a squeegee, a cleaning cloth supply mechanism that supplies the cleaning cloth to the squeegee mechanism, and the squeegee of the squeegee mechanism moves together with the screen. It comprises a stopper member that abuts the frame on the outer periphery of the mask to limit the pressing of the screen mask by the squeegee, and a solvent supply device that impregnates the cleaning cloth with a solvent.

(E) Operation In the above-mentioned configuration, the cleaning cloth is impregnated with the solvent from the solvent container, and then the cleaning cloth impregnated with the solvent is pressed against the lower surface of the screen mask by the squeegee of the squeegee mechanism. At this time, the stopper member, which moves together with the squeegee, comes into contact with the frame on the outer periphery of the screen mask to limit the pressing of the cleaning cloth against the screen mask by the squeegee to a constant value. In this way, the cleaning cloth impregnated with the solvent is pressed and moved with respect to the screen mask for cleaning. Next, the portion of the cleaning cloth not impregnated with the solvent is moved against the lower surface of the screen mask and moved again for cleaning.

(F) Embodiment One embodiment of the present invention will be described below with reference to the drawings.

The cleaning device of this embodiment is shown in FIGS. The cleaning device 1 includes a main body 2 having a pair of frames 21 and 22, a squeegee mechanism 3 attached to the main body 2, a cleaning cloth supply mechanism 5 for supplying a cleaning cloth C to the squeegee mechanism, and a cleaning cloth impregnated with a solvent. And a solvent supply device 6 for allowing the solvent to be supplied.

The main body 2 can be moved in the left-right direction (in FIG. 2) on the guide rail 11 by a known mechanism (not shown).

The squeegee mechanism 3 is a horizontal bar 2 fixed to the frames 21 and 22.
3, a cylinder 31 attached to the cylinder 3, a squeegee holder 32 attached to a piston rod of the cylinder 31, and a squeegee 33 made of rubber or the like attached to the upper surface of the squeegee holder 32. The squeegee holder 32 is guided by a pair of guide rods 35.

The squeegee holder 32 has a mounting member 4 extending in the width direction of the cleaning cloth and protruding to the outside of the frames 21 and 22.
1 is attached, and stopper members 42 are attached to both ends of the attachment member 41. The stopper member 42 is in the form of a roll and is rotatably attached, and is adapted to come into contact with a frame f attached around the screen mask m to roll.

The cleaning cloth supply mechanism 5 includes a pair of frames 21.
22, a supply roll 51 mounted on the frame, a winding roll 52, and four guide rolls 53.
And a pair of guide rolls 56 and 57 rotatably attached to the pair of attachment plates 54 and 55 attached to the horizontal bar 23 adjacent to the squeegee holder. A detent roll 58 is provided adjacent to the guide roll 56 to prevent the cleaning cloth C from rewinding.

The solvent supply device 6 has a structure in which a hygroscopic material contained in a rectangular container is impregnated with a solvent, and the hygroscopic member is brought into contact with the cleaning cloth to impregnate the cleaning cloth with the solvent. Has become.

Next, the operation of the above device will be described with reference to FIG.

As shown in FIG. 6A, the cleaning device 1 stands by with the squeegee holder 32 positioned directly below the solvent supply device 6. Then, the cylinder 31 of the squeegee holder 32 is raised and the squeegee 33 presses the cleaning cloth C against the hygroscopic member of the solvent supply device 6 to impregnate the cleaning cloth with the solvent. Thereafter, in the cleaning device 1, the squeegee 33 is moved to the position B below the screen mask m as shown in FIG. 6 (b). (At this time, the squeegee holder is lowered as shown in FIGS. 2 and 3.) When the cleaning device 1 is moved so that the squeegee is in the position B, the squeegee holder 32 moves up to the sixth position. As shown in FIG. 4B and FIG. 4, the cleaning cloth C impregnated with the solvent is pressed against the lower surface of the screen mask m by the squeegee 33. At this time, since the stopper member 42 contacts the lower surface of the frame f as shown in FIG. 4, the pressing force of the cleaning cloth by the squeegee can be limited.

Next, in this state, the cleaning device moves to the left in FIG. 6, and the lower surface of the screen mask is cleaned with a cleaning cloth. When the squeegee 33 arrives at the position C shown in FIG. 6C, the movement of the cleaning device is stopped. After that, the winding roll 52 of the cleaning cloth supply mechanism 5 is rotated by the motor 59 to slightly wind up the cleaning cloth, and the portion not impregnated with the solvent is fed to the squeegee portion. Under such a condition, the cleaning device moves in the opposite direction until the squeegee reaches the position b, and cleans the lower surface of the screen mask again with the cleaning cloth not impregnated with the solvent.

After that, the squeegee holder descends and the cleaning device stands by at the position a shown in FIG. 6 (a).

(G) Effect According to the present invention, since the cleaning cloth that does not generate fiber waste is used as the cleaning member, it is possible to prevent the fiber waste from being mixed in the paste and to keep the pressing force of the cleaning cloth constant by the stopper member. It is possible to prevent the screen mask from being pressed against as strongly as necessary and prevent the life of the screen mask from being shortened.

[Brief description of drawings]

FIG. 1 is a plan view of a cleaning device according to the present invention, and FIG.
1 is a side sectional view of the cleaning device shown in FIG. 1, FIG. 3 is an enlarged sectional view of a part of the cleaning device shown in FIG. 1, and FIG. 4 is a view similar to FIG. 3 showing different operating positions. 5 is an enlarged sectional view taken along the line V-V in FIG. 1, and FIG. 6 is an operation explanatory view of the apparatus in FIG. 1: Cleaning device, 2: Main body 3: Squeegee mechanism 32: Squeegee holder, 33: Squeegee 42: Stopper member 5: Cleaning cloth supply mechanism 6: Solvent supply device

Claims (1)

[Claims] 1. An apparatus for cleaning a screen mask by bringing a cleaning member into contact with the surface of the screen mask, wherein the cleaning member comprises a cleaning cloth wound in a roll shape, and the cleaning apparatus includes the cleaning cloth. A squeegee mechanism that presses against the lower surface of the screen mask with a squeegee, a cleaning cloth supply mechanism that supplies the cleaning cloth to the squeegee mechanism, and a squeegee of the squeegee mechanism that moves with the squeegee and contacts the mask on the outer periphery of the screen mask. A screen mask cleaning device comprising: a stopper member that limits pressing of the screen mask by a squeegee; and a solvent supply mechanism that attaches a solvent to the cleaning cloth.