JPH0342568B2 - - Google Patents

Abstract

PURPOSE:To manufacture the titled welder, which can weld and process a processing material uniformly, by detecting the change of the marking of a temperature indicating member mounted to a hold-down roller and adjusting the quantity of a hole for processing vibrated and/or the speed of transfer of the processing material in response to the detecting outputs. CONSTITUTION:A photodetector 29 detects the temperature of the outer circumferential surface of a hold-down roller 25 at all times, the degree of amplification of a variable amplification-degree amplifying circuit 36 is controlled in response to the detecting signals, and the quantity of an ultrasonic vibrating element 9 vibrated is adjusted. The degree of welding of a processing material is kept constant, and the processing material can be welded and processed excellently at all times regardless of the degrees of the temperatures of the outer surfaces of the hold-down roller 25 and a processing surface.

Description

Detailed Description of the Invention Technical Field The present invention applies ultrasonic vibration to a sheet-shaped material that is pressed between a processing surface formed on a processing horn and a presser roller placed opposite to the processing surface. This invention relates to an ultrasonic welding machine that automatically ultrasonically welds polymerized sheet-like processed material by applying the applied material and transporting the processed material in one direction.

Prior Art When ultrasonically welding sheet-like processing materials using the conventional apparatus described above, the temperatures of the processing surface of the processing horn and the presser roller at the start of the processing operation are relatively low, and the processing operation cannot be continued continuously. When the ultrasonic welding process is carried out on a regular basis, the frictional heat generated during the ultrasonic welding operation is accumulated on the presser roller and the processed surface, and their temperatures become relatively high. Therefore, if the vibration amount of the processing horn and the transfer speed of the processing material are set so that the welding of the processing material is optimal at the start of the processing operation, when the processing operation is performed continuously, the presser roller As the temperature of the machined surface increases, the material to be processed may become overly welded, and in extreme cases, holes may form in the material, or conversely, the temperature of the presser roller, etc. may rise relatively. If the vibration amount of the machining horn, the transfer speed of the machining material, etc. are set low in advance so as to perform the optimal welding work on the processed material in the state where However, this method had the problem that it could not be applied and it caused problems.

Further, as a device for solving the above-mentioned problems, an adjusting means is provided to detect the temperature of the presser roller and adjust the vibration amount of the processing horn or the transfer speed of the processing material based on the detected temperature signal. Although something has already been proposed by the applicant,
In these devices, the detection device for detecting the temperature of the presser roller comes into contact with the presser roller, resulting in problems with its durability, and non-contact types have problems such as the cost becoming too high. It was defective.

Purpose This invention was made in order to solve the above-mentioned problems, etc., and includes a temperature indicating member that changes its own color in response to changes in the temperature of the presser roller, which is attached to at least a portion of the presser roller. Along with letting
A detection device for detecting a change in the color of the temperature indicating member and an adjustment circuit for adjusting one or both of the vibration amount of the processing horn and the transfer speed of the processing material in response to the detection output from the detection device are provided. By automatically adjusting the amount of vibration of the horn, the transfer speed of the material to be processed, etc. in response to changes in the temperature of the presser roller, it is possible to uniformly weld the material to be processed even if the temperature of the presser roller changes. Moreover, it is an object of the present invention to provide an ultrasonic welding machine whose detection device has a simple configuration and can be realized at low cost.

Embodiment Hereinafter, an embodiment in which the present invention is embodied in an ultrasonic welding machine will be described based on the drawings. A bed 2 is fixed to a part of a workbench 1 constituting a part of a machine frame, and a frame 3 is fixed to the lower surface of the bed 2. A pair of supports 4 are fixed to the frame 3. Further, an arm 6 having a head portion 5 extending leftward in the drawing is fixed to the upper surface of the bed 2.

A vibrator assembly 7 is supported by the pair of supports 4 so as to be rotatable about a vertical line, and the vibrator assembly 7 is rotationally driven in one direction by a motor 8 fixed to the frame 3. And the vibrator assembly 7
has a built-in ultrasonic transducer element 9, and this ultrasonic transducer element 9 is connected to a pair of slip rings 10 fixed to the transducer assembly 7 and a pair of contacts 11 fixed to the frame. A high frequency current is supplied by a high frequency generator 31 shown in FIG. 3 to generate ultrasonic vibrations. A processing horn 12 is connected to the upper part of the ultrasonic vibration element 9. The upper part of the machining horn 12 has a cylindrical shape, and the annular machining surface 13 formed on the upper end surface vibrates ultrasonically in the vertical direction.
3 is exposed on the upper surface of the workbench 1 through a circular hole 14 formed in the bed 2, and
and is arranged so as to be on the same level as the top surface of the bed 2.

A motor 1 as a driving means is mounted on the underside of the workbench 1.
5 is fixed. A connecting shaft 16 extending substantially horizontally is rotatably supported inside the arm 6, and a timing pulley 17 is fixed to one end of the connecting shaft 16.
A timing belt 19 is hung between the timing pulley 18 on the motor shaft of the motor 15 and the timing pulley 18 on the motor shaft of the motor 15.

A presser bar 20, which is always urged downward by a spring 21, is supported on the head portion 5 so as to be movable up and down. A support frame 23 is fixed to the lower end of the presser bar 20, and the support frame 23
A presser roller 25 as a presser is connected to the shaft 24.
is supported, and the presser roller 25 is rotatable above the processing surface 13 about one axis substantially parallel to the processing surface 13. The connecting shaft 1
A timing pulley 26 is fixed to the other end of the shaft 24, and a timing pulley 27 that rotates integrally with the presser roller 25 is supported on the shaft 24.
8 is attached. When the motor 15 is rotated in one direction, the presser roller 25 is rotated in the same direction as the rotation direction of the processing surface 13 via the connecting shaft 16, timing belts 19, 28, etc.

The presser roller 25 consists of a metal roller 25a and an elastic roller 25b, which is an endless belt attached to the outer circumference of the roller 25a.
The elastic roller 25b made of silicone rubber is mixed with a temperature-indicating material whose color changes depending on the temperature during molding, and exhibits a red color at room temperature. It is constructed so that it exhibits a dark brown-purple color when the temperature exceeds 70°C. The elastic roller 25b
In this case, an intermediate layer 25d located between an inner circumferential layer 25c that is brought into close contact with the metal roller 25a and an outer circumferential layer 25e that faces the processing surface 13 has a three-layer foam structure having a large number of foam-like small holes. It has a structure.

A reflective photodetector 2 consisting of a light projecting unit 29a and a light receiving unit 29b is disposed inside the support frame 23 at a position facing the outer circumferential surface of the presser roller 25.
9 is fixed, and arranged so that a color change from red to brown-purple based on a temperature change of the elastic roller 25b can be detected.

As shown in FIG. 3, the high frequency generator 31 includes a feedback circuit 35, a variable amplification degree amplification circuit 36 as a control means for controlling the amount of vibration of the ultrasonic vibration element 9, and a power amplification circuit 36. A detection circuit 30 including a circuit 37 and including the photodetector 29 is connected to the variable amplification circuit 36 . The detection circuit 30 includes an identification circuit equipped with a comparison circuit for detecting a color change of the elastic roller 25b of the presser roller 25 based on the detection output from the detector 29, and is responsive to the output of the detection circuit 30. The amplification degree of the variable amplification degree amplification circuit 36 is changed, and the amount of vibration of the ultrasonic vibration element 9 can be adjusted in stages.

Next, the operation of the ultrasonic welding machine configured as above will be explained. First, a sheet-shaped material to be processed is placed on the upper surface of the bed 2 including the processing surface 13 of the processing horn 12, and when the presser roller 25 is lowered by the push-up lever 22, a pressing force is applied to the material to be processed. is held between the processing surface and the presser roller. When a processing start switch such as a foot switch is operated in this state, a high frequency current is supplied to the ultrasonic vibrating element 9 to ultrasonically vibrate the processing horn 12, and the rotation of the motor 15 causes the presser roller 25 to move in one direction. be rotated. For this reason,
Processing horn 1 while processing material is sent in one direction
The welding process is continuously performed between the processed surface 13 of No. 2 and the presser roller 25. In this case, in this ultrasonic welding machine, the photodetector 25 constantly detects the temperature of the outer peripheral surface of the presser roller 25, and generates a detection signal depending on whether or not the temperature exceeds 70°C. In response to this, the amplification degree of the variable amplification degree amplification circuit 36 is controlled, and the amount of vibration of the ultrasonic vibration element 9 is adjusted in accordance with the detection signal. That is, when the outer surface temperature of the press roller 25 and the processing surface 13 is low and the press roller 25 exhibits a red color, the amount of vibration, that is, the amplitude of the ultrasonic vibration element 9 increases accordingly, and the pressure roller and the processing surface 13, the outer surface temperature of the presser roller 2 becomes high.
When the color of the ultrasonic transducer 5 changes from red to brown-purple, the amplitude of the ultrasonic vibration element 9 is controlled to be small. Therefore, the degree of welding of the material to be processed is always maintained constant, and excellent welding can always be performed regardless of the temperature of the outer surfaces of the presser roller 25 and the processing surface 13.

In the above embodiments, the temperature-indicating member attached to the presser roller is a silicone rubber roller in which a temperature-indicating material is mixed in advance during molding. It is also possible to attach paint or tape, and an example is shown in which only one type of temperature-indicating material is used and a single detector is provided as a detection device to detect the discoloration. However, for example, the roller may have a multilayer structure divided by a plane perpendicular to the axis of rotation of the roller, and each layer may be coated with various temperature-indicating materials that change color at different temperatures. A large number of detectors may be provided to detect the discoloration of each of the temperature indicating members by attaching them to a holding roller for paint, tape, or the like that changes color.

Furthermore, in the above embodiment, an example was shown in which only the amount of vibration of the ultrasonic vibrating element could be adjusted as a means for adjusting the degree of welding of the processed material in response to temperature changes of the presser roller. As means for adjusting the degree, for example, it is possible to change the transfer speed of the processed material, or to adjust both the amount of vibration of the ultrasonic vibration element mentioned above and the transfer speed of the processed material. Needless to say.

Effects As described in detail above, the present invention provides an ultrasonic processing machine that performs continuous ultrasonic welding on a workpiece held between a presser roller and a processing surface. A temperature indicating member whose color changes in response to changes is installed, and a detection circuit that detects the color change of the temperature indicating member is installed, and the amount of vibration of the machining horn is determined in response to the detection output from the detection circuit. This system adjusts either or both of the transfer speed of the material to be processed and the transfer speed of the material to be processed, and not only can uniform welding be performed on the material to be processed even if the temperature of the presser roller etc. changes, but also the configuration of the detection circuit can be adjusted. It has excellent effects such as being simple and realizing the detection circuit at low cost.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is a front view of an ultrasonic welding machine, and Figure 2 is an enlarged view of the pressure roller. The sectional view and FIG. 3 are block circuit diagrams showing the electrical configuration. In the figure, 9 is an ultrasonic vibration element, 12 is a processing horn, 13 is a processing surface, 15 is a motor, 25 is a presser roller, 29 is a detector, 30 is a detection circuit, 31 is a high frequency generator, and 36 is a variable increaser. This is a width increasing circuit.

Claims (1)

[Claims] 1. A processing horn connected to an ultrasonic vibrator;
a presser roller disposed to face a machining surface formed on the machining horn, a vibrator driving means for ultrasonically vibrating the ultrasonic vibrator, and a vibrator disposed between the machining surface and the press roller. and a transfer means for transporting the sheet-shaped processing material in one direction, the polymerized sheet-shaped processing material, etc. is pressed and clamped between the processing surface and the press roller, and ultrasonic vibration is applied to the processing surface. In an ultrasonic welding machine that continuously welds the sheet-shaped processed material by transporting the sheet-shaped processed material in one direction, a temperature-indicating member that changes its own color in response to temperature changes is used. a detection device attached to at least a portion of the presser roller and detecting a change in color of the temperature indicating member; and an amount of vibration of the machined surface based on the vibrator driving means in response to a detection output from the detection device. and an adjustment circuit that adjusts either or both of the transport speed of the sheet-shaped processing material based on the transport means. 2. The presser roller includes an endless belt made of a rubber-based elastic material that is detachably attached to a rotating shaft,
2. The ultrasonic welding machine according to claim 1, wherein said temperature indicating member is made of a temperature indicating material mixed into its endless belt. 3. The detection device includes a reflective photodetector disposed opposite to the outer peripheral surface of the endless belt, and a comparison circuit that compares a detection output from the photodetector with a preset setting output. An ultrasonic welding machine according to claim 2, characterized in that it comprises: