JPH0450160B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cutter to which ultrasonic vibrations are applied for cutting sheet materials such as cloth, paper, and vinyl film.

[Conventional technology]

FIG. 5 is a side view showing the structure of a conventional ultrasonic cutter, and FIG. 6 is a side view showing only the vicinity of the cutter. 1 is an ultrasonic oscillation power source, 2 is an ultrasonic vibrator excited in the direction of arrow A by the ultrasonic oscillation power source 1, 3 is a vibration amplifier connected to the ultrasonic vibrator 2, and 4 is connected to the vibration amplifier 3. It's a katsuta.

5 is the fabric of the sheet material to be cut, and the fabric is placed on a support stand 6
The ultrasonic vibrator 2 is supported by hand or mechanically so that the direction of ultrasonic vibration indicated by arrow A is approximately perpendicular to the surface of the fabric 5, and the cutting edge of the cutter 4 is placed on the fabric 5. The cloth 5 is cut by moving in the direction of arrow P.

As shown in FIG. 6, when the vibration amplitude of the cutter 4 is observed under a microscope, it can be seen that the vibration amplitude of the cutter 4 is in the same direction as arrow A, which is the vibration direction of the ultrasonic vibrator 2, as shown by arrow B;
In other words, it is observed that vibrations are generated in the vertical direction on the cloth surface.

In this case, a graph showing the relationship between the force required to move the ultrasonic transducer 2 in the direction of arrow P (the cutting direction) (hereinafter referred to as cutting force) and the moving speed to cut the fabric 5 is shown below. It is shown in FIG. In the ultrasonic cutter having the configuration shown in Fig. 5, the solid line indicates the case where the ultrasonic oscillation power source 1 is operated, and the broken line indicates the case where it is not operated. Approximately 10% compared to the case without
Cutting force decreased by only ~15%.

[Problem that the invention seeks to solve]

As explained above, in the ultrasonic cutter having the conventional configuration shown in FIG. 5, the effect of ultrasonic vibration is small. The blade of an ultrasonic cutter with a conventional structure is subjected to ultrasonic vibration in a direction perpendicular to the surface of the cloth to be cut. That is, the direction of ultrasonic vibration of the cutter blade was perpendicular to the direction of cutting progress.

Although this has not been done in the past, the cutting force was actually measured using an ultrasonic cutter having the configuration shown in FIG. 8 as an attempt. Fig. 8 is a side view of the experimental apparatus in which the ultrasonic vibration direction of the ultrasonic vibrator is aligned with the cutting direction, the same reference numerals as in Fig. 5 indicate parts having the same functions, and the ultrasonic oscillation power source 1 is omitted. be.

The ultrasonic vibrator 2 is held so as to generate ultrasonic vibration parallel to the fabric 5 as shown by arrow A, and the cutter 4 is attached to the amplitude amplifier 3 fastened to the ultrasonic vibrator 2 at right angles to the direction of the ultrasonic vibration. is installed. In this way, the cutter 4 vibrates almost purely parallel to the surface of the fabric 5.

In this way, the ultrasonic vibrator 2 is moved in the direction of the arrow P, which is the same direction as the arrow A, which is the ultrasonic vibration direction, and the cutting force required to cut the fabric 5 at that time is determined at various moving speeds. The measured results are shown in Figure 9. As in Fig. 7, the solid line indicates the case where the ultrasonic oscillation power source 1 is operated, and the broken line indicates the case where it is not operated.In this case, by applying ultrasonic vibration, the cutting force can be reduced to 50% or less. decreases.

It can be seen that when applying ultrasonic vibration to the cutter in this way, a great effect can be obtained by vibrating the cutter in a direction along the direction of movement of the cutter.

However, in a structure in which the ultrasonic vibration direction of the ultrasonic transducer 2 is parallel to the surface of the fabric 5 as shown in FIG. The movable portion becomes long in the direction of movement, making it extremely difficult to handle either by hand or mechanically supporting it, making it difficult to put it to practical use.

[Means for solving problems]

In order to eliminate the drawbacks shown in the conventional products and experimental examples, the present invention has been developed so that the ultrasonic vibration direction of the ultrasonic vibrator is perpendicular to the cloth surface, while the blade of the cutter is installed parallel to the cloth surface. The vibration direction component of the direction can be given with a simple structure.

That is, the cutter is attached to an amplitude amplifier to which the cutter is attached, with the cutter projecting out in a direction perpendicular to the direction of ultrasonic vibration of the amplifier, and bending vibration is generated between the cutter blade part and the part of the projecting part that is attached to the amplifier. The invention is characterized in that it is configured to generate a vibration direction component in a direction perpendicular to the ultrasonic vibration direction of the amplifier in the cutter blade portion.

[Effect]

The ultrasonic cutter according to the present invention has the cutter attached to the amplitude amplifier to which the cutter is attached, protruding in a direction perpendicular to the direction of ultrasonic vibration.
Since the center of gravity of the cutter is not on the vibration direction line of the attachment part of the cutter to the amplitude amplifier, bending vibration occurs in the cutter, and the blade part of the cutter approximately vibrates along an arc centered on the attachment part of the cutter to the amplitude amplifier. do.

Therefore, by selecting the distance from the vibration direction line of the attachment part of the cutter to the amplitude amplifier to the center of gravity of the cutter, and the relative position of the attachment part of the cutter to the amplitude amplifier and the cutter blade, It is possible to appropriately generate a vibration direction component in a direction perpendicular to the ultrasonic vibration direction of the amplitude amplifier in the cutter blade portion.

〔Example〕

FIG. 1 is a side view showing the configuration of an embodiment of the ultrasonic cutter according to the present invention, and FIG. 2 is a side view of only the vicinity of the cutter, and the same reference numerals as in FIGS. 5 and 6 are used. Indicates parts that have the same function.

The cutter 11 in this embodiment is attached to an amplitude amplifier 3 installed so as to vibrate ultrasonically in a direction perpendicular to the surface of the fabric 5, so as to protrude in a direction perpendicular to the direction of arrow A, which is the direction of ultrasonic vibration. , the cutter blade portion 11a is made to protrude from the cutter 11 toward the cloth 5 side.

The fabric 5 is cut by penetrating the cutting edge of the cutter 11 into the fabric 5 and moving the ultrasonic vibrator 2 in the direction of arrow P, which is the direction of the cutting edge of the cutter blade portion 11a.

At this time, when the ultrasonic vibrator 2 is caused to ultrasonically vibrate by the ultrasonic vibration power source 1, the center point O of the attachment part of the cutter 11 to the amplitude amplifier 3 vibrates on a line Y-Y parallel to the arrow A. . Since the center of gravity G of the cutter 11 is separated by a distance l from this line Y-Y, the cutter 11 is approximately centered at O as a cantilever beam.
The bending vibration occurs in the arcuate direction shown by the arrow C with the center at , and the vibration displacement occurs as shown by the broken line.

Therefore, the cutting point D of the cutter blade 11a is also approximately vibrated and displaced in the circular arc direction centered on the center point O.
As shown in the figure, it has a vibration direction component in the cutting direction orthogonal to arrow A, which is the vibration direction of the ultrasonic vibrator 2.

FIG. 3 shows the results of actual measurement of the cutting force by the ultrasonic cutter shown in FIG. 1 at various cutter moving speeds. Due to the effect of vibration of the cutter blade 11a in the cutting direction, the cutting force was reduced to about 50% compared to when no ultrasonic vibration was applied, and a great effect was obtained in cutting fabrics.

FIG. 4 is a side view of only the vicinity of the cutter part of another embodiment of the ultrasonic cutter according to the present invention;
The same reference numerals as in the figures and FIG. 2 indicate the same parts, and the parts not shown are the same as in the previous embodiment shown in FIG.

The cutter 12 in this embodiment is directed to the amplitude amplifier 3, which is installed so as to vibrate ultrasonically in a direction perpendicular to the surface of the fabric, in the direction indicated by the arrow A, which is the direction of ultrasonic vibration.
The cutter blade 12a is attached so as to protrude in a direction perpendicular to the fabric. Katsuta 12
The center of gravity G of the cutter 12 is separated from the vibration line Y-Y at the center point O of the attachment part to the amplitude amplifier 3 by a distance l, but the cutting point E of the cutter blade 12a is approximately at the vibration line Y-Y. It is above.

In this embodiment, when the amplitude amplifier 3 is ultrasonically vibrated in the direction of the arrow A, the cutter 12 is vibrated and displaced approximately as a cantilever beam about the center O as shown by the broken line. Therefore, the cutting point E of the cutter blade portion 12a also vibrates approximately in an arcuate direction centered on the center point O, so that the direction of the vibrational displacement of the cutting point E substantially corresponds to the cutting direction. As a result of actual measurements, it was possible to significantly reduce the cutting force in this example as well.

As is clear from the above two embodiments, the ultrasonic cutter according to the present invention can change the vibration direction of the cutter blade by changing the relative position of the cutter blade with respect to the center point O of the cutter attachment part to the amplitude amplifier 3. Components can be selected as appropriate. It is also possible to adjust the amplitude value of the cutter blade by changing the distance l between the center of gravity G of the cutter and the vibration line Y-Y of the center point O.

In the ultrasonic cutter according to the present invention, the cutter is attached so as to protrude orthogonally to the direction of ultrasonic vibration of the amplitude amplifier 3 as described above, and from the vibration line Y-Y of the center point O of this attachment part to the center of gravity G of the cutter. It is characterized in that a predetermined distance is provided between the cutter blade portion and the relative position of the cutter blade portion with respect to the center point O of the attachment portion is appropriately selected.

With such a configuration, the ultrasonic vibration applied to the amplitude amplifier in the direction perpendicular to the surface of the sheet to be cut can generate a vibration direction component in the cutting direction perpendicular to this in the cutter blade.

〔Effect of the invention〕

As explained in detail above, the ultrasonic cutter according to the present invention causes the cutter blade to move in a direction perpendicular to the surface of the sheet material to be cut by ultrasonic vibration applied to the amplitude amplifier in a direction perpendicular to the surface of the sheet material to be cut. Because it can generate a vibration direction component in the cutting direction, it provides an ultrasonic cutter that can significantly reduce the cutting force and can be installed in a narrow space, and has great industrial effects. big.

[Brief explanation of drawings]

Fig. 1 is a side view showing the configuration of an embodiment of the ultrasonic cutter according to the present invention, Fig. 2 is a side view of only the cutter portion, and Fig. 3 shows various cutting forces of the ultrasonic cutter of Fig. 1. FIG. 4 is a side view of only the vicinity of the cutter portion of another embodiment of the ultrasonic cutter according to the present invention;
Figure 5 is a side view showing the configuration of a conventional ultrasonic cutter, Figure 6 is a side view of only the vicinity of the cutter, and Figure 7 is the relationship between cutting force and cutter movement speed in the ultrasonic cutter shown in Figure 5. Figure 8 is a side view of the experimental equipment in which the ultrasonic vibration direction of the ultrasonic vibrator is aligned with the cutting direction, and Figure 9 shows the relationship between cutting force and cutter moving speed in the equipment shown in Figure 8. It is a graph. 1... Ultrasonic oscillation power supply, 2... Ultrasonic vibrator,
3...amplitude amplifier, 4,11,12...katsuta,
5...Fabric, 6...Support stand.

Claims (1)

[Claims] 1. In an ultrasonic cutter having a means for generating ultrasonic vibrations for cutting sheet materials, etc., a vibration amplifier to which the cutter is attached is disposed in a direction perpendicular to the surface of the sheet material, and the ultrasonic vibration of the amplifier is A cutter is attached with a cutter extending in a direction perpendicular to the cutter direction, and bending vibration is generated between the cutter blade and the attachment part of the overhang to the amplifier, and the cutter blade is moved in a direction along the cutting direction of the sheet material. An ultrasonic cutter characterized by being configured to vibrate.