JPH11277500A - Ultrasonic machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a need to move a ultrasonic head for regulation of a ultrasonic machine force. SOLUTION: A paper sheet 14 being a work is fed through between a ultrasonic head 10 and a cylinder 12 with blades. The paper sheet 14 is conveyed by a conveyance mechanism consisting of rollers 16 and 18. A distance measuring device 20 measures a distance between the ultrasonic head 10 and the cylinder 12 with a blade, and a rotary encoder 22 detects the rotation of the cylinder 12. A control circuit 24 controls a supersonic wave oscillation circuit 26 according to the outputs of a distance measuring device 20 and a rotary encoder 22, the thickness and the material of the paper sheet 14, and information indicating distribution of the blades of the cylinder 12 with blades. The vibration amplitude generating by a ultrasonic head 10 is rendered proper to the processing purpose of the paper sheet 14. An ultrasonic oscillation circuit 26 drives the supersonic vibrator of a ultrasonic head 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an ultrasonic processing apparatus, and more particularly, to an ultrasonic processing apparatus for processing a sheet or the like using ultrasonic waves.

[0002]

2. Description of the Related Art As an ultrasonic processing apparatus, for example, ultrasonic energy is applied to a polymer material to generate heat due to mechanical friction or vibration between constituent molecules in the material, thereby welding or embossing the materials. And die cutting.

[0003] Since the amplitude of the ultrasonic vibrator itself is small, the amplitude generated by the ultrasonic vibrator is usually increased by amplifying means called a booster, and the ultrasonic wave is concentrated on an object by means called a horn or a cone. I try to make it.
Typically, the ultrasound transducer, booster and horn or cone are integral and will be referred to herein as an ultrasound head.

[0004] In order to use an ultrasonic processing device stably on a production line, it is necessary to stably control the mechanical force of ultrasonic waves on a processing object. This is because the mechanical force of the ultrasonic wave on the object changes not only according to the state of the object itself, but also according to the moving speed thereof. In the conventional example, an actuator for mechanically moving the ultrasonic head closer to or away from the object is provided, and the distance between the ultrasonic head and the object to be processed is adjusted.

[0005]

In the prior art in which the ultrasonic head is moved, there is a problem that the means for movably supporting the ultrasonic head, for example, the O-ring is easily distorted by ultrasonic waves generated during use or generated. It is.

In the case where a pneumatic cylinder system is used as an actuator, the pneumatic cylinder has a problem that hunting is likely to occur depending on a change in line speed or a change in the state of a workpiece. If a stepping motor is used as a drive source, the problem of hunting does not occur, but a control system for the hunting is required, resulting in a very expensive system.

An object of the present invention is to solve such a problem and to provide an ultrasonic processing apparatus that can be used more stably.

[0008]

According to the present invention, a distance measuring means for measuring a distance between an ultrasonic head and a processing member is provided, and a driving circuit of the ultrasonic head is controlled in accordance with the measured distance. The amplitude of the vibration of the ultrasonic head is controlled to a predetermined value. Accordingly, if the distance between the ultrasonic head and a processing member, for example, a processing blade is within a predetermined range (for example, about 100 μm), desired ultrasonic energy can be applied to the workpiece without strict adjustment. To obtain desired processing performance.

Further, by controlling the drive circuit of the ultrasonic head in consideration of the processing amount of the processing member, a constant and stable processing performance can be obtained regardless of whether the processing amount is large or small.

Further, by controlling the driving circuit of the ultrasonic head in consideration of the thickness and material information of the workpiece,
More stable processing becomes possible.

In the present invention, the driving circuit of the ultrasonic head is controlled in accordance with the processing amount of the processing member, and the ultrasonic energy supplied from the ultrasonic head is controlled to a predetermined value. As a result, a constant and stable processing performance can be obtained regardless of whether the processing amount is large or small.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic block diagram showing an embodiment of the present invention. The present embodiment is applied to an apparatus for cutting out a part of a sheet. Reference numeral 10 denotes an ultrasonic head, which faces the cylinder 12 with a blade and is disposed at an appropriate interval in a direction in which ultrasonic waves are emitted toward the cylinder 12 with a blade. Paper 14 to be processed is passed between the ultrasonic head 10 and the bladed cylinder 12. The paper 14 is transported by a transport mechanism including rollers 16 and 18. The drive source of the transport mechanism is a normal motor, and is not shown.

Although the reason will be described later, in the present embodiment, the interval between the tip portion (ultrasonic irradiation surface) of the ultrasonic head 10 and the bladed cylinder 12 does not need to be strictly constant. Paper 1
Depending on the thickness of 4, it is necessary to adjust the distance between the tip of the ultrasonic head 10 (ultrasonic irradiation surface) and the bladed cylinder 12.

In this embodiment, a distance measuring device 20 for measuring the distance between the tip end surface of the ultrasonic head 10 and the bladed cylinder 12 is provided, and a rotary encoder 22 for detecting the rotational position of the bladed cylinder 12 is provided. Is provided.
The measurement result of the distance measuring device 20 and the detected angle information of the rotary encoder 22 are applied to the control circuit 24. In addition, information indicating the thickness and the material of the paper 14 and the distribution of the blades of the bladed cylinder 12 are input to the control circuit 24.

The control circuit 24 determines from the input information that the vibration amplitude of the ultrasonic wave generated by the ultrasonic head 10 is appropriate for the purpose of processing the paper 14 (for example, 1).
The ultrasonic oscillation circuit 26 is controlled. The ultrasonic oscillation circuit 26 generates an AC signal having an amplitude or power specified by the control circuit 24 and applies the AC signal to the ultrasonic transducer of the ultrasonic head 10.

FIG. 2 shows the ultrasonic head 10, the bladed cylinder 12, and the ultrasonic head 10 and the bladed cylinder 1.
2 shows a perspective view of a sheet 14 inserted between the sheets 2. As is well known, the ultrasonic head 10 receives 17 kHz from the oscillation circuit 26.
An ultrasonic vibrator 30 that is driven by an AC signal of z to 100 kHz to generate ultrasonic waves, a booster 32 that amplifies the ultrasonic waves generated by the ultrasonic vibrator 30, a ultrasonic cylinder amplified by the booster 32, and a cylinder with a blade The horn 34 converges on a straight line parallel to the twelve rotation axes. In this embodiment, a blade 36 for cutting the paper 14 into a square is provided in the bladed cylinder 12.

FIG. 3 shows a flowchart of a control operation by the control circuit 24 of the present embodiment. FIG. 4 shows a processing pattern according to the present embodiment. FIG. 4A shows the ultrasonic head 10.
Horn 34 has a square processing pattern,
4 shows the arrangement of the horn 34 when facing the long side in the direction perpendicular to the traveling direction of FIG. 4, and FIG. 4B shows the case where the opening of the horn 34 faces the middle of the square processing pattern. , Horn 34 are shown. In the case of FIG.
Since the cutting length is the longest, it is necessary to maximize the vibration energy of the ultrasonic waves generated by the ultrasonic head 10. On the other hand, in the state shown in FIG. 4B, the vibration energy of the ultrasonic waves generated by the ultrasonic head 10 is made relatively small.

The operation of this embodiment will be described with reference to FIG. First, the thickness and material of the paper 14 to be processed,
In addition, information on the distribution of the blades of the bladed cylinder 12 is set in the control circuit 24 (S1). Paper 1 to be processed
The roller 4 is transported by a transport device including rollers 16 and 18 very close to, for example, the blade of the bladed cylinder 12, for example, so that the blade 4 comes into close contact therewith.

The distance measuring device 20 measures the distance between the ultrasonic head 10 and the bladed cylinder 12, and supplies the measurement result to the control circuit 24. Further, the rotary encoder 22 supplies rotation angle position information of the bladed cylinder 12 to the control circuit 24. The control circuit 24 fetches the information (S2, S3) and, together with the previously input information on the thickness and the material of the paper 14 and the distribution information of the blades of the bladed cylinder 12, provides the optimum The vibration amplitude of the sonic transducer 30 is calculated (S4). For this calculation, for example, a trial processing may be repeated to find the optimum amplitude value for each situation in advance, and the correspondence table may be stored in the control circuit 24.

The control circuit 24 controls the oscillation circuit 26 to supply a drive current having the calculated amplitude value to the ultrasonic transducer 30 of the ultrasonic head 10 (S5). The paper 14 is pressed against the bladed cylinder 12 by the mechanical force of the ultrasonic waves generated by the ultrasonic head 10,
A square is cut out by the second blade 36 as shown in FIG. The ultrasonic waves generated by the ultrasonic head 10 adaptively according to the thickness and the material of the paper 14 to be processed, the distribution of the blades of the bladed cylinder 12, and the distance between the ultrasonic head 10 and the bladed cylinder 12. , The optimum cutting result can be obtained.

If there is no change in the paper 14 (S6), S2
The subsequent steps are repeated, and if there is a change in the sheet 14, the process returns to S1, and information such as the thickness of the sheet 14 is input again.

As described above, in the present embodiment, it is not necessary to move the ultrasonic head 10 itself, so that the problem in the conventional example is completely solved. Further, since it is only necessary to electrically control the amplitude of the ultrasonic wave generated by the ultrasonic head, it can be realized even by a low-speed microcontroller or the like, and the device is inexpensive and stable.

Since the cutting depth can be controlled by the vibration amplitude, for example, a shallow cut in a corrugated cardboard,
It is also easy to realize a cut in only one of the two sheets bonded together.

[0025]

As can be easily understood from the above description, according to the present invention, an ultrasonic processing apparatus which operates stably and has good processing performance can be realized. Since it is not necessary to move the ultrasonic head itself with respect to the workpiece in order to adjust the processing performance, application to a production line is facilitated.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of an embodiment of the present invention.

FIG. 2 is a perspective view showing a positional relationship among an ultrasonic head 10, a bladed cylinder 12, and a sheet 14 of the present embodiment.

FIG. 3 is an operation flowchart of the embodiment.

FIG. 4 is an explanatory diagram of a relationship between a processing position and a sound pressure.

[Explanation of symbols]

 10: Ultrasonic head 12: Cylinder with blade 14: Paper 16, 18: Roller 20: Distance measuring device 22: Rotary encoder 24: Control circuit 26: Ultrasonic oscillation circuit 30: Ultrasonic oscillator 32: Booster 34: Horn 36: Blade

Claims (10)

[Claims] An ultrasonic processing apparatus for irradiating a workpiece with ultrasonic energy to process the workpiece, wherein the workpiece is disposed between an ultrasonic head and an ultrasonic radiation surface of the ultrasonic head. A processing member that is disposed at an interval capable of being inserted and processes the workpiece, a transport member that transports the workpiece between the ultrasonic head and the processing member, A drive circuit for driving the ultrasonic transducer, a distance measuring means for measuring a distance between the ultrasonic head and the processing member, and a drive circuit for controlling the drive circuit in accordance with a measurement distance of the distance measuring means. An ultrasonic processing apparatus comprising: a control unit that controls an amplitude of a radiation sound wave of a sound wave head to a predetermined value. 2. The ultrasonic processing apparatus according to claim 1, wherein the processing member is a bladed cylinder that rotates in synchronization with a transfer speed of the workpiece and includes a processing blade for the workpiece. And a rotation position detecting means for detecting a rotation position of the bladed cylinder. The control circuit is supplied with information indicating a distribution of the blades of the bladed cylinder. Controlling the drive circuit in accordance with the measured distance of the distance measuring means and the rotational position of the bladed cylinder detected by the rotational position detecting means to control the amplitude of the radiated sound wave of the ultrasonic head to a predetermined value. Claim 2
The ultrasonic processing apparatus according to item 1. 4. The controller further receives information on the thickness and the material of the workpiece, controls the drive circuit in consideration of the information, and sets the amplitude of the vibration of the ultrasonic head to a predetermined value. The ultrasonic processing apparatus according to claim 1, wherein the ultrasonic processing apparatus controls the ultrasonic processing. 5. The ultrasonic processing apparatus according to claim 1, wherein the workpiece is a paper material. 6. An ultrasonic processing apparatus for processing a workpiece by irradiating the workpiece with ultrasonic energy, wherein the workpiece is disposed between an ultrasonic head and an ultrasonic radiation surface of the ultrasonic head. A processing member that is disposed at an interval capable of being inserted and processes the workpiece, a transport member that transports the workpiece between the ultrasonic head and the processing member, A drive circuit for driving the ultrasonic vibrator; and control means for controlling the drive circuit in accordance with the processing amount of the workpiece by the processing member and controlling the amplitude of the radiation sound wave of the ultrasonic head to a predetermined value. An ultrasonic processing apparatus characterized by the above-mentioned. 7. The ultrasonic processing apparatus according to claim 6, wherein the processing member is a bladed cylinder that rotates in synchronization with a transfer speed of the workpiece and includes a processing blade for the workpiece. And a rotation position detecting means for detecting a rotation position of the bladed cylinder, wherein the control circuit is supplied with information indicating a distribution of blades of the bladed cylinder; 8. The ultrasonic processing according to claim 7, wherein the drive circuit is controlled in accordance with the rotational position of the bladed cylinder detected by the rotational position detection means, and the amplitude of the vibration of the ultrasonic head is controlled to a predetermined value. apparatus. 9. The control means further receives information on the thickness and the material of the workpiece, controls the drive circuit in consideration of the information, and sets the amplitude of the vibration of the ultrasonic head to a predetermined value. The ultrasonic processing apparatus according to claim 6, wherein the ultrasonic processing is controlled at a time. 10. The ultrasonic processing apparatus according to claim 6, wherein the workpiece is a paper material.