JPS59113B2 - Method and device for tensioning sheet materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and device for uniformly and strongly tensioning a sheet-like material such as cloth or leather, and an object of the present invention is to make it suitable for use in applying the leather to musical instruments such as percussion instruments and shamisen. That is.

Conventionally, tensioning of a sheet-like material is simply done by firmly holding the edge of the material to be tensioned along the circumference and pulling it, so the tension is higher near the outer periphery, and the tension increases as you move toward the center. The degree becomes smaller.

Therefore, the larger the area of the material to be tensioned, the more the central portion remains in a state close to zero tension.

A sheet-like material that cannot be tensioned uniformly has the disadvantage that it produces a dull tapping sound during use, and that it loosens because it is not tensioned.

The present invention provides a tensioning device that applies uniform tension to an object to be tensioned, which overcomes the drawbacks of the prior art.

As a result of intensive research, the inventors of the present invention have provided a method and apparatus for tensioning a sheet-like material, which eliminates the conventional defects and applies uniform tension to a material to be tensioned.

That is, the present invention holds and fixes the periphery of the material to be strained, and applies multi-step pressure perpendicularly to the material to be strained in stages from near the center outwards to uniformly tension the entire material. A method for tensioning a sheet-like object and a device directly used to carry out the method, which includes a holding device for fixing the outer periphery of the material to be strained, and a device for vertically facing the material to be strained held by the holding device. and a pressing part provided at the tip of a shaft that can protrude from the material, and the pressing part is provided in multiple stages to sequentially press the material to be stretched from the center to the outer circumference. .

Hereinafter, the present invention will be explained using the drawings.

FIG. 1 is a plan view showing an example of the implementation of the present invention, in which the outer periphery of the material 9 to be tensioned is fixed in the horizontal direction by a holding device.

That is, it is attached with a clip 8 provided on the frame 7 with a slight tension in the horizontal direction.

The clips 8 are attached to the frame 7 at appropriate intervals to hold an object to be tensioned.

Further, in the multi-stage pressing, pressure is applied in the vertical direction to the material 9 to be strained, as shown in FIG.

This device moves up and down perpendicularly to the material to be tensioned 9 using cylinders 4, 5, 6, and includes a central pressing portion 1 provided at the tip of a shaft 12a that first presses the vicinity of the center of the material to be tensioned; The shaft 12b is sequentially moved outward around this central pressing part.
It is composed of a middle stage pressing part 2 provided at the tip of the shaft 12c and a rear stage suppressing part 3 provided at the tip of the shaft 12c.

Each of the pressing portions exerts a multi-stage pressing action in the vertical direction on the object to be tensioned, which is being tensioned in the horizontal direction by the holding device, thereby uniformly tensioning the object.

In contrast to the first stage of compression, the second stage of pressing must be applied to the surrounding area in stages.

The number of stages of this suppressing section is not limited to three stages, and the number of stages can be increased depending on the size of the object to be stretched.

The compression may be of a rising type as shown in FIG. 2, or may be of a lowering type, as long as it is perpendicular to the material to be strained.

Next, the operation of the present invention will be explained.

First, the periphery of the material to be strained is held horizontally with the clip 8.

Thereafter, suppression is sequentially applied from the vicinity of the center toward the outside using the suppression sections L2 and 3 located perpendicularly to the horizontally held object to be strained.

The order of pressing by the pressing parts 1, 2 and 3 is as follows: first, the cylinder 4 of the central suppressing part 1 is operated to tension the central part q of the object 9 to be tensioned.

Next, the cylinder 5 of the middle stage suppressing part 2 is operated to raise or lower it slightly from the central pressing part 1 to apply tension around the vicinity 9' of the central part, and finally, the rear stage pressing part 3 is raised or lowered to move it outward. give tension.

In this way, by sequentially applying multi-stage pressure to the object to be strained from the vicinity of the center toward the outside, it is possible to apply uniform tension to the entire object to be strained.

The tension material obtained in this way is as shown in Fig. 3.
For example, while maintaining a certain tension on the tension frame 10,
1 to form an artificial sheet-like article, which can be easily used to replace the skin of a percussion instrument or a stringed instrument.

In the present invention, the material to be tensioned may be any material that requires tension, such as leather for percussion instruments or artificial leather.

[Brief explanation of the drawing]

The first is a plan view showing an example of implementation of the present invention, and the second is a plan view showing an example of implementation of the present invention.
FIG. 3 is a cross-sectional view showing an example of manufacturing a musical instrument. 1... Central pressing part, 2... Middle pressing part, 3... Rear pressing part, 4, 5, 6...
Cylinder, 7... Frame, 8...
Clip, 9...Stressed material, 10...
- Stretching frame, 11...Adhesive, 12a. 12b, 12c...Axes.

Claims (1)

[Claims] 1. Hold and fix the periphery of the material to be strained, and press the material to be strained vertically in multiple steps radially outward from the vicinity of the center to uniformly press the material as a whole. A method for tensioning a sheet-like object, characterized by tensioning it. 2 Consisting of a holding device that fixes the outer circumferential portion of the material to be strained, and a pressing portion provided at the tip of a shaft that can protrude in a vertical direction toward the material to be strained held by the holding device, the material to be strained is 1. A tensioning device for a sheet-like material, characterized in that the pressing portions are provided in multiple stages so as to sequentially press the material from the center toward the outer periphery.