JPS58102766A - Screen stretcher in screen printing - Google Patents

Abstract

PURPOSE:To slide grasper itself automatically in the left and right arbitrary directions in response to the elasticity of threads, and to direct the weft yarn and warp yarn a screen to be arranged at right angles by making the holding section of the screen grasper movable and connecting the holding section to a piston rod. CONSTITUTION:When the stretcher is mounted outside a screen frame body, the lever 9 of a hand vice is operated and the weft yarn and warp yarn of the screen are held to the screen grasper 2, and the piston rod 5 is pulled to the air cylinder 4 side through the operation of the air cylinder 4, thereby, each of the weft yarn and warp yarn becomes tensional. Since the allowance of fixed length 'L' is formed among bearings 13 and the left and right side walls in a connecting section 11 mounted at the nose of the piston rod 5 through the bearings 13 at that time, screen grasper 2 itself is automatically slid in the left and right arbitrary directions within the range of 'L' in response to the elasticity and tensile force of each thread to a block base 7. That is, the grasper 2 is moved in either of left and right directions by the tension of the yarns, and respective yarn is automatically arranged to be directed at right angles.

Description

DETAILED DESCRIPTION OF THE INVENTION In order to improve the precision of screen printing, the present invention stretches the vertical and horizontal threads that make up the screen as perpendicularly as possible.
Moreover, the purpose is to obtain a plate with high tension.

Conventionally, in this type of extension device, as shown in Fig. 1, the screen grasping device (2) and its holding part (3) are directly connected to the piston rod (5) of the air cylinder (4), so the frame A stretching device is arranged according to the body (6), and the screen 1
If the end of the screen [8] is held in the screen gripping device (2) and the lever (9) of the hand vise is set, the screen [8] will be in a fixed state where it is held in the screen gripping device (2). , it will be pulled back by the operation of the air cylinder (4).

That is, as shown in Fig. 2, the warp (1) of the screen (8)
(10a) ...and weft (10b) (10b
)-- are the opposing stretching devices <1 among the stretching devices (1) (1)... attached to the outer side of the frame (6), respectively.
It is in a fixed state between 1 (l1) and the warp (10a
) (1(')a)- and weft (10b) (lnb)
It is no longer possible to expect each intersection angle to be a right angle. Therefore, it has been impossible to obtain clear and high quality printing results using this screen.

This invention was proposed in view of the above-mentioned defects in the prior art, and by making the holding part of the screen gripping device movable and connecting it to the piston rod, the screen gripping device itself can be It is an object of the present invention to provide a screen stretching device which is formed to automatically slide left and right as desired depending on the elasticity of the screen, so that the vertical and horizontal threads of the screen are at right angles.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. Figure t43 is a perspective view of the stretching device according to the present invention, and there is an air cylinder (4) behind the block stand (7).
is fixed, and a screen grasping device (2) for grasping the screen from above and below is attached to the front part of the screen so as to be slidable left and right with respect to the block stand (7). Of course, this screen grasping device is the same as before, using the lever (9) of the hand vise.
Naturally, it is formed so that it can be opened and closed freely.

The screen grasping device (2) is attached to the holding part 02, and this holding part a'lJ is connected to the connecting part (5) fixed to the piston rod (5) of the air cylinder (4).
lυ and the bearing (13+13). In this embodiment, the connecting part (1υ) is generally box-shaped, and there is a certain distance between the bearing (13(+■) and the left and right side walls of the connecting part f+9. This is to allow for a length rLJ.

Since the present invention relates to the configuration described above, this device is attached to the outside of the frame (6) in the same manner as in the prior art. Then, actuate the lever (9) of the hand vise to hold the vertical and horizontal threads of the screen in the screen grasping device (2) r2)...K, and operate the air cylinder C4) (4)... When the piston rod (505)... is pulled toward the air cylinder (4) (4)... side, each of the vertical and horizontal threads is pulled. At this time, piston rod (5) r5
The connecting part (IIMIll...) attached to the tip of the bearing (13163) through the bearing (13163) is designed to have a certain length rLJ between the bearing α'3a and its left and right side walls. , the screen grasping device! (2'1
f2)... itself slides arbitrarily and automatically to the left or right within the range of "L" above, depending on the elasticity of the six threads and their tensile force with respect to the block stand (7). That is, the holding part 02
The bearings attached to the bearings (11) can slide within the length range of "L" arbitrarily, but they move to either the left or right depending on the tension of the threads and automatically move the 6 threads. This makes it perpendicular to .

Of course, since all that is required is a fine adjustment, the length of f7LJ may be extremely small. Furthermore, since the operation of attaching the vertical and horizontal threads at right angles to each other is completely automatic, anyone can easily carry out this operation and no skill is required.

The screen thus obtained constitutes a device of great practical value, as it can be expected to produce clear and high-quality printing effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional tensioning device, FIG. 2 is a plan view of a conventional tensioning device K when the screen is tensioned, FIG. 3 is a perspective view of a tensioning device showing an embodiment of the present invention, and FIG. The figure is a sectional view taken along the line A-A in FIG. 3. Explanation of symbols (1)...Expansion device (2)...
・Screen gripping device (3)・・・・Holding part
(4)...Air cylinder (5)...
... Piston rod (6) ... Frame Body (force/
...Block stand (8) ...Screen (9) ...Lever (10a)
...Warp Qll...Connection (10b)
... Weft thread 02 ... Holding section (13
... Pairing patent applicant Mino Group Co., Ltd. - Figure 2

Claims (1)

[Claims] When stretching the screen, the warp threads,
It is characterized by having a mechanism that slides left and right on the screen holding part or connecting part so that the weft threads intersect at right angles,
Screen stretching device in screen printing.