JPH0231788A - Ultrasonic cutting-instrument - Google Patents

Abstract

PURPOSE:To easily cut fiber of thermoplastic resin and to effectively prevent frays of its cloth by a method wherein each main body piece is pivoted in the middle part so as to freely turn and slide on each periphery of blade parts and each ultrasonic vibration shifting a phase with each other is applied along a blade part in the longitudinal direction. CONSTITUTION:A blade par 2 of each main body piece 1 is formed by a horn member 5, and an ultrasonic vibrator 4 is provided between each horn member 5 and a pivot 6, and a cutting blade 7 forming the blade part 2 is provided with the left end of the horn member 5. An electric current supplied to the ultrasonic vibrator 4 out of an ultrasonic osillator 20 is previously adjusted so that both cutting blades 7, 7 may vibrate in the opposite direction with each other, i.e. each phase is shifted at an angle of 180 deg.. For this reason, when each edge of the cutting blades 7, 7 is put together by holding handling-parts 3 like normal scissors, it is possible to easily cut the fiber of thermoplastic resin, since both cutting blades 7, 7 are vibrated with high speed and the fiber itself is heated by their vibration. In this case, its frays are effectively prevented since its cutting section is made globular by melting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic cutting device, and particularly to an ultrasonic cutting device suitable for cutting thermoplastic fibers such as polyester and polycarbonate.

[Conventional technology]

So-called thermoplastic fibers such as acrylic, polyethylene, vinyl, and nylon fibers generally have a linear polymer structure that softens when heated and hardens when cooled.

The thermoplastic fibers are usually cut using scissors.

[Problem to be solved by the invention]

However, when cutting thermoplastic fibers with scissors, it is necessary to apply a large amount of force, and there is also the problem that the cut fibers tend to fray.

[Purpose of the invention]

The purpose of the present invention is to improve the disadvantages of the conventional examples, and in particular, to easily cut thermoplastic fibers, and to
It is an object of the present invention to provide an ultrasonic cutting device that can effectively prevent fraying of the fiber ends.

[Means to solve the problem]

In the present invention, a pair of elongated main body pieces each having a blade portion at one side end and a handle portion at the other end are provided, and each end of the blade portion of one main body piece and the blade portion of the other main body piece are provided. Each main body piece is rotatably fixed at the middle part so that the edges are in sliding contact, and ultrasonic vibrations that are out of phase with each other are applied to each of the blades on one side and the other side along their longitudinal direction. The purpose of the present invention is to achieve the above-mentioned object by attaching an ultrasonic generating means to each main body piece.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The embodiment shown in FIG. 1 has a blade part 2 at the side end of one end,
A pair of elongated main body pieces l each having a handle portion 3 at the other end are provided. Each body piece 1 is rotatably pivoted at its intermediate portion so that the edges of the blade portion 2 of one body piece 1 and the blade portion 2 of the other body piece 1 come into sliding contact. .

An ultrasonic vibrator 4 is attached to each main body piece 1 as an ultrasonic generating means that applies ultrasonic vibrations that are out of phase with each other along the longitudinal direction of the blade portions 2 on one side and the other side. ing.

Among these, as the ultrasonic transducer 4, in this embodiment, a so-called internally tightened bolted Langevin type transducer is used. Specifically, this ultrasonic transducer 4 has P
A magnetic disk 4a made of ZT (lead zirconate titanate),
4a, and connect them to metal blocks 4b, 4b such as soft rope.
It is formed by sandwiching it in a sandwich shape. and,
Both metal blocks 4b, 4b are bolted together to improve vibration characteristics.

The blade side of each main body piece 1 is formed of a horn member 5, and here, the above-mentioned ultrasonic vibrator 4.4 is installed between each horn member 5 and the rotation support shaft 6. There is. To explain this in more detail, the ultrasonic vibrator 4 is fixed to the end surface of a mounting portion 5a formed at one end of the horn member 5 (the right end in FIG. 1) with a stud bolt 13. This mounting part 5a is
As shown in FIG. 3, it is formed by appropriately cutting off the upper and lower surfaces of one end of the conical rod, and a stepped portion 5b is formed at the left end of this cut portion.

On the other hand, the handle portion 3 is formed at the right end in FIG. 1 of the rod-like member 9 shown in FIG. The attached mounting portion 5a can be engaged with this recess 9a.

The mounting portion 5a of the horn member 5 is fixed to the recess 9a of the rod-shaped member 9 in the state shown in FIG. 3 by means of a set screw 8.8.

A cutter blade 7 forming the blade portion 2 is provided at the left end of the horn member 5 in FIG. This cutter blade 7
Actually, a portion of the left end of the horn member 5 in FIG. 1 is cut off, and is fixed there with a set screw 11.

One terminal (positive electrode) 10 is connected between the magnetic disks 4a, 4a.
a is sandwiched.

The metal block 4b is equipped with the other terminal (negative electrode) 10b (see FIG. 3).

One end of a lead wire 12 is connected to each of these terminals 10a, 10b, and the other end of this lead wire 12 is connected to an ultrasonic oscillator 20 shown in FIG.

Therefore, by activating the ultrasonic oscillator 20, ultrasonic vibration is generated in the ultrasonic vibrator 4, and the minute amplitude of the end face (ultrasonic radiation surface) of the ultrasonic vibrator 4 is transmitted to the horn member 5.
This causes the cutter blade 7 to reciprocate along the longitudinal direction of the horn member 5. In this embodiment, current is supplied from the ultrasonic oscillator 20 to the ultrasonic vibrator 4 so that the vibration directions of one and the other cutter blades 7.7 are opposite to each other, that is, the phase is shifted by 180''. is adjusted in advance (see the arrow in Figure 1). Therefore, when the cutter blades 7, 7 vibrate at high speed, the thermoplastic fiber itself generates heat due to the vibration, and as described in the previous example section above, Since the fibers become soft due to this heat, the thermoplastic fibers can be easily cut by holding the handles and aligning the cutting edges of one and the other cutter blades 7 like ordinary scissors. Further, in this case, the fibers at the cut point melt and become spherical, so there is an advantage that fraying can be effectively prevented.

〔Effect of the invention〕

The present invention is configured and functions as described above, and according to this, thermoplastic fibers are sandwiched between the blade portions of both main body pieces with the respective edges of the blade portions aligned, and an ultrasonic wave generating means is produced. Since it is possible to apply ultrasonic vibrations that are out of phase with each other along the longitudinal direction of one blade part and the other blade part, the thermoplastic fibers can be softened by the frictional heat generated by this vibration. This makes it possible to easily cut thermoplastic fibers, and the fibers at the cut point melt into spheres, effectively preventing fraying at the ends of the fibers. A sonic cutting device can be provided.

Note that the invention as set forth in claim 2 has the effect that thermoplastic fibers can be cut more easily.

[Brief explanation of the drawing]

Fig. 1 is an overall view showing the configuration of an embodiment of the present invention, Fig. 2 is an enlarged view of the main parts of Fig. 1, and Fig. 3 is a view taken along arrows ■-■ in Fig. 2. It is an explanatory diagram. 1...Body piece, 2...Blade portion, 3...
. . . Handle portion, 4 . . . Ultrasonic vibrator as ultrasonic generation means.

Claims (2)

[Claims] (1) A pair of elongated main body pieces each having a blade at one side end and a handle at the other end are provided, and each end of the blade of one body piece and the blade of the other body piece are provided. Each of the main body pieces is rotatably pivoted at its intermediate portion so that the edges are in sliding contact, and ultrasonic vibrations are applied to each of the blades on the one side and the other side in a phase-shifted manner along the longitudinal direction thereof. An ultrasonic cutting device characterized in that an ultrasonic generating means for applying an ultrasonic wave is attached to each of the main body pieces. (2) The ultrasonic cutting device according to claim 1, wherein the ultrasonic generating means applies ultrasonic vibrations having a phase shift of 180° to each of the one and the other blade portions.