JPS6139191B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applied to the process of manufacturing formwork used in the screen printing and screen printing industries, in which gauze is usually attached under tension to a frame made of wood or metal. To provide a gauze tensioning device capable of tensioning a gauze cloth evenly and uniformly over the entire surface of a form without applying excessive tension to the four corners of the gauze cloth, and without causing distortion in the weave of the gauze cloth that becomes the screen. This is what I am trying to do.

In conventional gauze tensioning devices, a gauze gripping tool is fixed on a tenter frame and the gauze is stretched by expanding the tenter frame in all directions.
When the gauze is stretched, the gauze is pulled in two orthogonal directions at its four corners, resulting in excessive tension, which causes the gauze to tear from the corners, making it impossible to apply large tension to the entire surface. If the four corners were loosened and the cloth was set in a gripper, the weave of the gauze would bend after it was put under tension, and the tension would also vary depending on the location, making it impossible to produce a formwork of good quality. .

On the other hand, the present invention is a gauze tensioning device which has a simple structure and can provide uniform tension over the entire surface of the gauze cloth and a very large tension without causing distortion in the screen.One embodiment of the present invention will be described below. The figure will be explained in detail. In the figure, 1 is a gauze cloth, and 2 is a formwork for pasting the gauze cloth 1. 3 is a lanter frame, and along the four sides of the formwork 2 are 3a, 3b, 3c,
3d, so that they form a quadrilateral. 4 is a rail attached along the longitudinal direction of the tenter frame 3, and 5 is a base that fixes a jacking member (air cylinder) 6, and supports the formwork 2 with an L-shaped portion 5' at its tip. be. The tip of the piston rod 7 of the jacking member 6 is connected to the tenter frame 3, and the jacking member 6 pulls the tenter frame in the direction of the arrow X in FIG. When the tenter frame 3 is fed in, it moves in the direction of pushing out the tenter frame 3 (in the opposite direction of the arrow X). Also, several jacking members 6 are required for one tenter frame 3. In the embodiment, an air cylinder is used as the jacking member 6, but other jacking members such as a screw type jack or an oil cylinder may also be used with the same effect. Reference numeral 11 denotes a gripping tool for the gauze cloth 1. At its base, rollers 13 and 13' are pivoted on studs 14 and 14' so that it can rotate freely. The tenter frame 3 is capable of freely sliding, and has multiple needles 12 planted at its tips for gripping the gauze 1, and each tenter frame 3 is equipped with multiple needles 12. In the embodiment, the needle 12 is used to grip the gauze 1, but the same effect can be obtained by using a known gripping mechanism such as a clip. In addition, the gauze cloth 1 is held by the gripping tool 11 using wheels attached to the base 5.
This is to allow the base 5 to move inward (in the direction of the Z arrow) by the reaction force when applying tension to the gauze cloth 1 by gripping and pulling the tenter frame 3 outward (moving in the direction of the X arrow) using the jacking member 6. It is.

Next, the tension process of the gauze cloth 1 will be explained. First, as shown in FIG. 1, the mold 2 is set on the L-shaped portion 5' of the base 5. (All bases 5a from all sides
(Support the formwork with the L-shaped tip portions 5'a1 to 5'd2 of 1 to 5d2) Next, set the four circumferences of the gauze 1 to all the gripping tools 11a1 to 11d4 as shown in FIGS. 2 and 4. . Next, compressed air is fed into the jacking member 6 from the air hose 8, and the tenter frames 3a to 3d are expanded in their quadrilaterals, with the tenter frame 3a moving in the direction of the Y arrow, and the tenter frame 3c moving in the direction of the Y' arrow in the same way as the tenter frame 3b.
3d is moved in the direction of the X arrow and 3d is moved in the direction of the X' arrow, and the gauze 1 is pulled in all directions to tighten it. At this time, the gauze gripping tool 11 naturally moves in the longitudinal direction on the rail 4 attached to the tenter frame 3, as shown in FIG. In other words, the length LX of the gauze is
Grasping tool 1 proportional to the amount of extension when extended to LX′
1a1 to 11a6 slide in the longitudinal direction on the rail 4a, and gripping tools 11c1 on the opposite side
~11c6 slides in the same way, and the gap A between the gripping tools becomes the gap A'. Similarly, the width of the gauze is LY.
LY' (the gap B between the gripping tools is enlarged to B', so that the tension is evenly distributed over the entire surface of the gauze cloth 1, without applying excessive tension to the four corners of the gauze cloth 1, and evenly to the screen edges). The gauze cloth 1 can be stretched and expanded without causing any distortion in the weave of the gauze cloth 1. Furthermore, the reaction force generated by the jerking member 6 when the gauze cloth 1 is stretched and expanded is transmitted to the base 5. The L-shaped portion 5' at the tip presses the form 2 in the direction of reducing its quadrilateral shape, and the form 2 is deformed by an amount proportional to the tension of the gauze 1, which balances the tension of the gauze 1. When the gauze cloth 1 is attached to the formwork 2 using an adhesive or the like, and then the part of the gauze cloth 1 that protrudes from the formwork 2 is removed, the formwork 2 will be compressed on its four sides by the tension applied to the gauze cloth 1. However, since the gauze cloth 1 was attached with the formwork 2 deformed by the reaction force of the jerking member 6 mentioned above, the formwork 2 did not deform further after removal, and therefore the tension decreased. The gauze can be stretched with uniform tension over the entire surface of the formwork.

As described in detail above, the present invention has tenter frames 3 for tensioning the gauze cloth 1 in all directions arranged so as to form a quadrilateral along the four sides of the gauze cloth 1, and each tenter frame 3 has tenter frames 3 along its longitudinal direction. A rail 4 is attached to the rail 4, and a gauze 1 is placed on the rail 4.
A plurality of gripping tools 11 for gripping are slidably arranged, four sides of the gauze 1 are set in the gripping tools 11, and four tenter frames 3a to 3d are separately provided. When the gauze 1 is stretched and expanded by moving the quadrilaterals formed by the tenter frames 3a to 3d so as to enlarge them, the gripping tool 11 automatically moves on the rail attached to the tenter frame 3 as the four sides of the gauze 1 expand. By sliding and enlarging, the entire surface of the formwork 2 is uniformly and evenly tensioned without applying excessive tension to the four corners of the gauze cloth 1.
This gauze stretching device can obtain an ideal screen pattern without causing any distortion in the weave of the gauze cloth 1, and can be widely used in the screen printing and textile printing industries.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the gauze tensioning device of the present invention;
3 and 3 are cross-sectional views showing the main parts thereof, and FIGS. 4 and 5 are schematic explanatory views of the gauging process. 1... Gauze, 2... Formwork, 3... Tenter frame, 4... Rail, 5... Base, 5'... L
Mold part, 6... Jacking member, 7... Piston rod, 8, 9... Air hose, 10... Wheel,
11... Grasping tool, 12... Needle, 13, 13'...
Roller, 14, 14'... Stud.

Claims (1)

[Claims] 1 Tenter frames for tensioning the gauze in all directions are arranged along the four sides of the gauze so as to form a quadrilateral, and a rail is attached to each tenter frame along its longitudinal direction, and a A plurality of gripping tools for gripping the gauze cloth are slidably arranged, the four sides of the gauze cloth are gripped by the gripping tools, and the quadrilaterals constituted by the tenter frame are gripped by a jacking member provided separately with four tenter frames. When tensioning the gauze by moving it so that it expands, the gripper holding the gauze automatically slides on the rails attached to the tenter frame and expands as the four sides of the gauze expand. Characteristic gauze tensioning device.