JPH0516097A - Ultrasonic cutting device - Google Patents

Abstract

PURPOSE:To obtain ultrasonic cutting device having the excellent cutting effect by reducing the cutting resistance of a longitudinal blade body. CONSTITUTION:A longitudinal blade body 2 is oscillated in the longitudinal direction, and while the ultrasonic oscillation is applied to the blade body 2 to generate the torsional vibration for oscillation within a surface including the short direction (cross direction). Cutting resistance is thereby reduced to obtain the excellent cutting effect.

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 having a longitudinal blade and ultrasonic vibrating means for exciting it.

[0002]

2. Description of the Related Art Conventionally, a non-excitation type cutting device cuts a long blade having a blade formed over substantially the entire length thereof by reciprocating in the longitudinal direction by a blade driving means. With this device,
For example, cuts such as breads, Western confectionery, or fruits and vegetables are pressed against the driving longitudinal blade to cut. However, in such a cutting device, the cut object is likely to stick to the side surface of the blade and a large amount of cutting dust is generated, and since the cut resistance is large, the cut object is soft such as a cake. There is a problem that it is deformed or part of the cut end is damaged, the cut surface is roughened, and the commercial value is lost.

An ultrasonic cutting device was developed to solve the above-mentioned problems in the non-excitation type cutting device. For example, as disclosed in Japanese Patent Publication No. 63-61160, a long blade is used. A device of the type that excites and cuts in the longitudinal direction is known.

[0004]

However, in the conventional ultrasonic cutting device, when the amplitude of the blade due to ultrasonic vibration is increased in order to improve the cutting effect, the conventional thin blade vibrates. When applied, the hardness of the blade is high, so that cracks or damage may occur. Therefore, it is necessary to increase the thickness of the blade in order to secure the strength of the blade against such a large-amplitude vibration, but the cutting resistance increases accordingly, and it is not always possible to obtain good results. There is.

Therefore, the present invention has been made in view of the above-mentioned drawbacks of the prior art. Even when a thin longitudinal blade similar to the conventional one is used, the cutting resistance can be reduced and the cutting can be performed. It is an object of the present invention to provide an ultrasonic cutting device capable of achieving further improvement of the effect.

[0006]

According to the present invention, there is provided a longitudinal blade body having a blade formed in the longitudinal direction, blade body driving means for reciprocating the longitudinal blade body in the longitudinal direction, and exciting the longitudinal blade body. The ultrasonic vibrating means is configured to excite the longitudinal blade body so as to oscillate in a plane including the lateral direction thereof.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an ultrasonic cutting device according to the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the ultrasonic cutting device 1 is
Having a longitudinal blade 2 that is reciprocally driven in the direction of arrow E,
The cutting object 4 conveyed by the belt conveyor 3 is cut using the conveying force F of the belt conveyor 3. The long blade 2 has a blade 2a over substantially the entire length thereof. In addition, as the cut object 4, bread,
Western confectionery, Japanese confectionery, fruits and vegetables, etc. may be mentioned.

FIG. 2 is a side view (including a partial cross section) of the ultrasonic cutting device 1 of FIG. 1, but as shown in the drawing, the long blade (hereinafter, simply referred to as a blade) 2 is provided. It is attached to the tip of the horn 6 at one end by a fixing means such as brazing. As shown in FIG. 2, the horn 6 is a blade body 2.
The transducer 10 is coupled to the end surface on the side opposite to the coupling surface with. The oscillator 10 is excited by an oscillator 11 to generate ultrasonic vibration.

The vibrator 10 is built in a case 12, and the case 12 is attached to a slider 15 via a bracket 13 as shown in FIG. This slider 15
Is a guide rail 1 provided on a flat base 16.
It is slidable along 7. In addition, the slider 15
The drive rod 19 has a pin 19a at one end thereof.
Is pivoted by. The other end of the drive rod 19 is pivotally mounted near the outer peripheral portion of the pulley 21 which is rotationally driven by the motor 20 by a pin 19b.

The slider 15 and the guide rail 17
The drive rod 19, the pins 19a and 19b, and the pulley 21 constitute a blade body driving unit that reciprocates the blade body 2 in its longitudinal direction. In addition, as shown in FIG. 1, the blade body 2 is set so as to form an angle θ with respect to the cut object carrying surface 3 a on the belt conveyor 3,
This angle θ is set to, for example, 45 ° in this embodiment.

On the other hand, the above-mentioned horn 6 enlarges and amplifies the ultrasonic vibration generated by the vibration of the vibrator 10 and transmits it to one end of the blade body 2, and as shown in FIG. And through the rubber packing 6b, the case 1
Supported by 2. Then, as shown in FIG.
The blade body 2 is excited by the torsional vibration as if it swings in a plane including its lateral direction. That is, the blade body 2 is
Torsional vibration occurs about the substantially central portion 2d in the lateral dimension (width dimension) B. Further, the length L of the blade body 2 is set to the resonance length of the vibration of the blade body based on the ultrasonic vibration transmitted from the horn 6. Therefore, by changing the length L of the blade body 2, it is possible to generate torsional vibrations such as a secondary mode when the number of nodes is two, a tertiary mode when the number of nodes is three, and the like.

As shown in FIGS. 2 and 4, in this embodiment, the torsional vibration has two node positions. The vibration frequency may be about 10 Hz to 100 kHz, but 10 kHz to 60 kHz is particularly desirable. By the way, when the length L of the blade body 2 is set to 155 mm and the thickness is set to 1.5 mm, the vibration frequency is about 20.5 k.
Good results were obtained when set to Hz. The amplitude in this case is 40 μm at the cutting edge, as shown in FIG.
It became pp.

Next, the operation of this embodiment having the above structure will be described.

First, when the pulley 21 is rotationally driven by the motor 20 shown in FIG. 1, the vibrator 10 and the blade body 2 move in the direction of arrow E.
Start a reciprocating motion in the direction. At the same time, the excitation current from the oscillator 11 shown in FIG. 2 is applied to the vibrator 10 to generate ultrasonic vibration. As a result, the blade body 2 undergoes torsional vibration as shown in FIG. Therefore, as shown in FIG. 1, the cut object 4 is pressed against the blade 2a of the blade body 2 with the conveying force F by the conveyor 3 to be cut, and
Sharpness is sharpened by the torsional vibration. Therefore, the adhesion of the cut object 4 to the blade body 2 and the generation of cutting residue are suppressed, and further, the cutting is performed without breaking the cut end. Further, since the blade body 2 is excited in the separating direction of the cut object 4 so as to swing in a plane including the lateral direction, the cutting resistance can be suppressed to be extremely small.

FIG. 5 is a diagram showing the ultrasonic cutting device according to the present invention having the above-described structure and a conventional device of the type that excites a longitudinal blade in its longitudinal direction. It is a graph which shows the measurement result regarding.

In this measurement, the conditions of both devices were the same. That is, the thickness and width dimension (width dimension) of the blade body are 1.5 mm and 12 mm, respectively, and the stroke of reciprocating motion in the longitudinal direction (E direction in FIG. 1) is 40 mm.
mm, and reciprocating movement was performed twice in 1.3 seconds. Then, the contact resistance generated between the blade body and the cutting object 4 when the blade body moves forward (or backward) is measured for each of the case where the blade body is excited and the case where the blade body is not excited. The value obtained by dividing the contact resistance value (load) of No. 2 by the contact resistance value (load) when not excited is shown as a relative contact resistance ratio on the vertical axis in FIG. This relative contact resistance ratio is the vibration amplitude U of the cutting edge.
Is the result of measurement while changing from 0 (μmp-p) to 50 (μmp-p). However, the solid line H is the measurement result of the ultrasonic cutting device of the present invention, and the measurement result of the conventional device is shown by the chain double-dashed line I. The sharpness of both devices can be compared based on such measurement results.

As is clear from the measurement results shown in the figure, the relative contact resistance ratio decreases when the effect of ultrasonic vibration is exerted. Therefore, the sharpness of the ultrasonic cutting device according to the present invention is better than that of the conventional device. It is clear that

[0019]

As described above, according to the present invention,
When the thickness of the blade is made larger than that of the conventional one because the long blade swings in the plane including the short direction, that is, it is excited in the separation direction of the cut object. However, the cutting resistance can be suppressed to be small, and therefore, the cutting effect can be improved by increasing the amplitude.

[Brief description of drawings]

FIG. 1 is a schematic side view of an ultrasonic cutting device according to the present invention and a belt conveyor used together therewith.

FIG. 2 is a side view including a partial cross section of the ultrasonic cutting device shown in FIG.

FIG. 3 is a view taken along the line AA in FIG.

FIG. 4 is a diagram showing a vibration mode of a longitudinal blade included in the ultrasonic cutting device shown in FIG.

FIG. 5 is a graph for comparing the sharpness of the ultrasonic cutting device of the present invention and the conventional device.

[Explanation of sign]

 1 Ultrasonic Cutting Device 2 Longitudinal Blade 3 Belt Conveyor 4 Cutting Material 6 Horn 10 Transducer 11 Oscillator 12 Case 15 Slider 16 Base 17 Guide Rail 20 Motor

Claims (1)

Claim: What is claimed is: 1. A longitudinal blade body having blades formed in the longitudinal direction, blade body driving means for reciprocating the longitudinal blade body in the longitudinal direction, and a super-exciter for exciting the longitudinal blade body. An ultrasonic cutting device, comprising: an ultrasonic vibrating unit, wherein the ultrasonic vibrating unit is configured to excite the longitudinal blade so that the longitudinal blade is swung in a plane including a lateral direction thereof.