JPH0732998B2 - Ultrasonic cutting device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic cutting device used for cutting or cutting a sheet material or cloth.

[0002]

2. Description of the Related Art Generally, when cutting or cutting a sheet material or a cloth, the cutting resistance is reduced by ultrasonically vibrating the cutting edge.
It is widely known that this improves sharpness, and is widely used as an ultrasonic vibration cutter. Such an ultrasonic vibration cutter is particularly used for cutting sheet materials such as plastics, rubber and paper, and for cutting cloth and leather, and the structure thereof is
A commercially available cutter knife blade or a dedicated blade is attached to the output end of a normal vertical vibrator, and the axial vibration of the vertical vibrator effectively cuts the blade sharpening effect and friction resistance. Is being done.

Further, the applicant of the present invention has previously disclosed an ultrasonic cutter which uses a cutting blade provided at the output end of a flexible vibrator by vibrating it at a right angle to the vibrator axis or at a controlled angle.
It is proposed as seen in Japanese Patent No. 114478. The contents will be described with reference to FIG. First, the blade 4 having the obliquely formed cutting edge 3 of the output end 2 of the flexural vibrator 1 is fixed, and the blade 4 is disposed so as to face the counterbore 6 of the table 5. Then, when the flexural vibrator 1 is driven, the blade 4
Is ultrasonically vibrated in the direction indicated by the arrow 7, and the sheet 8 is easily cut by moving the sheet 8 in the vibrating direction.

[0004]

A conventional vertical vibrator or a blade driven by the above-mentioned flexural vibrator cuts a sheet to be cut by repeating the acceleration of a large vibration. Good cutting can be performed by using a material such as general paper, rubber, or plastic sheet that exhibits resistance to ultrasonic vibration. However, when the cloth to be cut is a soft material, the cloth escapes against the vibration of the blade and cannot be cut at all when the cloth is floating. Therefore, the cloth is placed on a hard plate such as hard plastics or glass, and the fibers of the cloth sandwiched by the collision between the blade and the hard plate are cut. Therefore, as the floor plate, the harder the glass plate is, the better the cloth can be cut, but on the contrary, the wear of the cutting edge becomes large.

Further, recently, various new materials have been put into practical use. For example, a fiber using an aramid resin having a high specific strength is difficult to cut even by an ultrasonic vibration cutter due to its remarkably high strength. is there.

[0006]

Means for Solving the Problems A movable blade, which is connected to an ultrasonic oscillator and vibrates ultrasonically and has a cutting edge formed, is provided, and a small gap is formed between the movable blade and the cutting edge. A fixed blade was disposed by inclining the ridges and crossing them.
Further, at least one of the movable blade and the fixed blade is made to vibrate at a low frequency.

[0007]

[Function] When the sheet to be cut is fed toward the crossing portion of the cutting blades of the movable blade and the fixed blade, the sheet to be cut is subjected to high-frequency repeated shearing between the movable blade and the fixed blade that vibrate ultrasonically with a small amplitude It receives power and is disconnected. Further, by superimposing the low-frequency vibration, a composite action with a large amplitude is performed with a low repetition, and a larger cutting effect is obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. First, the vertical vibrator 10 as an ultrasonic vibrator
A horn 12 for enlarging the vibration amplitude is joined to the output end 11 by bolts. And the cutting edge 14
A tool holder 15 in which a blade 14 made of high-speed steel or cemented carbide having a is joined with silver brazing is formed, and the tool holder 15 is formed by a bolt 16 provided at the center of the thin end portion 13 of the horn 12. It is tightly fastened. The node portion 17 of the horn 12 is strongly pressed and fixed to the countersunk bottom portion of the casing 18. A stepped different diameter portion 19 is formed at an end portion of the casing 18, and the stepped different diameter portion 19 has a base portion 2 having a step portion at an inner diameter portion.
0 is fitted.

Further, a tab 22 having a slit 21 provided in a radial direction is formed on the base 20 so as to project therefrom. A hole 23 is formed in one of the tabs 22 and the tab 22 facing each other is not shown. A screw hole is provided. Then, by tightening a bolt 24 that is screwed into this screw hole, the base 20 is firmly fixed to the different diameter portion 19 of the casing 18 with the circumferential angle adjusted.

A second base 2 is provided on the base 20.
5, a slit 26 and tabs 27 and 28 are formed on the base 25, and the tab 28 is provided with a hole 30 and a slit 29 continuous with the hole 30. Further, a hole 31 is formed in the tab 28, and a screw hole (not shown) is formed in the facing tab 28. Furthermore, the tab 27 has a screw hole 27.
a is provided and a hexagon socket set screw 33 is inserted.

Next, the fixed blade 34 provided with the cutting blade 34a
Has its base portion sandwiched in a thread provided on the shank 35 and joined by silver brazing. And shank 3
The end portion of 5 can be fitted into a hole 30 provided in the tab 28 and fixed by the bolt 32 by aligning the cutting blade 34a. Therefore, according to the fastening angle of the movable blade 14, the opposing surfaces of the fixed blade 34 and the movable blade 14 are brought into close contact with each other, and the second base 25 is temporarily fixed by the bolts 36, 37, and 38 to the base 20. It is attached to the different-diameter portion 19 and fixed by the bolt 24, and further, the shank 35 is fixed by the bolt 32. Bolts 36 and 37 connect half of the second base 25 to the base 20.
Fixed to. Further, after the gap between the facing surfaces of the movable blade 14 and the fixed blade 34 is set to a required value by the hexagon socket set screw 33, the bolt 38 tightly tightens.

The oscillating movable blade 14 and the other fixed blade 34 cross each other with their ridges of the cutting blades 14a, 34a inclined, and the gap between the surfaces thereof is very small, for example, 10.
adjusted to μ.

In such a structure, the sheet to be cut 4
When 0 is fed in the direction of the arrow 41 into the meshing portion of the cutting blades 14a and 34a, the sheet 40 to be cut is sandwiched between the movable blade 14 that vibrates ultrasonically in the direction of the arrow 42 and the other fixed blade 34, and the shearing force is applied. Received a light cut. The gap between the surfaces of the movable blades 14 and the fixed blades 34 is set to be sufficiently smaller than the thickness of the sheet 40 to be cut (the thickness of fibers in the case of woven cloth). However, if they are too narrow, when they are pushed and bent, they come into contact with each other and the cutting edges 14a, 3
4a will be damaged.

As described above, it is possible to easily cut cloth or leather which cannot be cut by floating in the air by the conventional ultrasonic cutter. Further, the vibrator may be placed inside the table, the cross portion of the blade may be slightly raised and fixed on the work table, and the sheet to be cut may be fed on the table.

In the implementation, the sheet may be cut by holding the vibrator in the hand or by holding the vibrator in the NC control.

[0016]

As described above, the present invention is provided with a movable blade which is connected to an ultrasonic vibrator and vibrates ultrasonically and has a cutting edge formed therein, and a small gap is formed between the movable blade and the cutting edge. Since the fixed blade is arranged by inclining the ridgeline of the cutting edge and crossing it, when the sheet to be cut is fed toward the crossing portion of the cutting blades of the movable blade and the fixed blade, the sheet to be cut vibrates ultrasonically. The movable blade and the fixed blade can be easily cut by receiving high repetitive shearing force with a small amplitude, and as a result, aramid fiber woven fabric, which was hardly cut by conventional cutters or scissors, can be easily cut. It is also possible to cut a metal thin film such as iron, copper or aluminum with a clean cut surface with less burr and burrs, and by superposing low frequency vibration,
Even if it repeats at a low frequency, it can be combined with a large amplitude to obtain a greater cutting effect.In particular, the blades are not scratched because they do not hit the hard floor plate etc. or rub each other like scissors. It has the effect of being hard to attach and having a long blade life.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is an exploded perspective view.

FIG. 4 is a vertical sectional side view showing an example of the related art.

[Explanation of symbols]

 10 Ultrasonic transducer 14 Movable blade 14a Cutting blade 34 Fixed blade 34a Cutting blade

Claims (2)

[Claims] 1. A cross formed by inclining a ridge line of a cutting blade with a minute gap between the movable blade connected to an ultrasonic vibrator and vibrating ultrasonically and having a cutting blade formed thereon, and the cutting blade of the movable blade. An ultrasonic cutting device comprising a fixed blade arranged in parallel. 2. The ultrasonic cutting device according to claim 1, wherein at least one of the movable blade and the fixed blade is vibrated at a low frequency.