JPH0342567B2 - - Google Patents

Abstract

PURPOSE:To manufacture the titled welder, which can execute uniform welding at each position of welding positions, by adjusting the quantity of an ultrasonic vibration applied to a processing material in response to the marking of a temperature indicating member mounted to a hold-down roller and/or the speed of transfer of the processing material. CONSTITUTION:A temperature indicating material, colors thereof change in response to temperatures, is mixed into an elastic roller mounted to the outer circumference of a roller made of a metal of a hold-down roller 25. An operating switch 34 adjusting the magnitude of high-frequency currents fed to an ultrasonic vibrator 9 is arranged to a control panel 33. Ultrasonic vibration energy applied to a processing material held between a processing surface 13 and the hold-down roller 25 is adjusted in response to the temperature change of the hold-down roller.

Description

[Detailed Description of the Invention] Technical Field The present invention applies ultrasonic vibration to a sheet-like processing material that is held between a processing surface formed on a processing horn and a press roller placed opposite to the processing surface. The present invention also relates to an ultrasonic welding machine that automatically ultrasonically welds polymerized sheet material by transporting the sheet material in one direction.

Prior Art In the conventional apparatus described above, for example, since the temperature of the presser roller and the processing surface is low at the start of the processing operation, there is a risk that the processing material will not be sufficiently melted and sufficient welding processing will not be performed. Further, when the ultrasonic welding process is performed continuously, heat is accumulated in the presser roller and the processed surface, and the presser roller and the processed surface become hot. In such a case, the material to be processed is melted by the heat from the presser roller and the processing surface, so the material to be processed is melted too much, and if the material to be processed is a thin sheet, holes may form in the melted part. Sometimes I feel like I'm at a loss. Therefore, by sandwiching the sheet-shaped processing material between a presser roller and a processing horn and rotating the presser roller in one direction, ultrasonic vibrations are applied to the processing horn while transferring the processing material. When welding two polymerized processed materials, the temperature of the presser roller and the processed surface will be different at the welding start and end positions due to the heat generated on the processed surface during the welding process, so Uniform welding could not be achieved.

Purpose This invention was made in order to solve the above-mentioned problems.A temperature indicating member for indicating the temperature of the presser roller is attached to the presser roller, and an operator can control the temperature according to the color change of the temperature indicating member. An operating switch arranged to be operable, and an adjustment circuit that adjusts either or both of the amount of ultrasonic vibration applied to the processed material and the transfer speed of the processed material in response to the operation of the operating switch. By providing this, the ultrasonic vibration energy applied to the workpiece held between the processing surface and the presser roller can be adjusted according to the temperature change of the presser roller, and the It is an object of the present invention to provide an ultrasonic welding machine that can uniformly weld a processed material at each welding location by eliminating variations in welding.

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 to the left 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 is configured in 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 belt 19 is disposed between a timing pulley 17 fixed to one end of the connecting shaft 16 and a timing pulley 18 on the motor shaft of the motor 15. is hung.

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. A timing pulley 26 is fixed to the other end of the connecting shaft 16, and a timing pulley 27 that rotates integrally with the presser roller 25 is supported on the shaft 24. A timing belt 28 is connected between the pulleys 26 and 27. is hung. And the motor 15
When the presser roller 25 is rotated in one direction, the presser roller 25 is rotated in the same direction as the rotational direction of the processing surface 13 via the connecting shaft 16, timing belts 19, 28, and the like.

The presser roller 25 consists of a metal roller 25a and an elastic roller 25b made of silicone rubber that is removably attached to the outer periphery of the roller 25a, and the color of the elastic roller 25b changes depending on the temperature during molding. It is configured to have a red color at room temperature and a dark brown-purple color when the surface temperature of the presser roller 25 exceeds 70°C. The elastic roller 25b has an inner circumferential layer 25c that is in close contact with the metal roller 25a, and an outer circumferential layer 2 that faces the processing surface 13.
The intermediate layer 25e located between the intermediate layer 25e and the intermediate layer 25e is composed of an endless belt with a three-layer structure having a foamed structure with a large number of foam-like small holes, and the outer circumferential surface thereof has an axis of rotation of the shaft 24 of the presser roller 25. A large number of slits 25f are formed along substantially orthogonal planes.

A control box 32 containing a control device including a high frequency generator 31 for supplying high frequency current to the ultrasonic transducer 9 is disposed on the right side of the workbench 1. On the control panel 33, a switchable operation switch 34 is arranged to adjust the magnitude of the high-frequency current supplied to the ultrasonic transducer 9. Band-shaped indicators 34b are formed along the movement path of the portion 34a, which are divided into two colors: a red portion and a brownish-purple portion.

As shown in FIG. 3, the high frequency generator 31 includes a feedback circuit 35, a variable amplification circuit 36 as a control means for controlling the amount of vibration of the ultrasonic vibration element 9, and a power amplification circuit 37. , by switching the amplification degree of the variable amplification degree amplification circuit 36 based on the switching operation of the operation switch 34,
It is configured such that the amount of vibration of the ultrasonic vibration element 9 can be adjusted.

Next, the operation of the ultrasonic welding machine configured as above will be explained. First, at the start of the welding process, the roller 25a of the presser roller 25 is usually at about the same temperature as room temperature, so it is red in color, and the operator has to turn the operating switch 34 with its pointer as shown in FIG. The switching operation is performed so that the indicator 34a is located in the red portion of the indicator 34b. Thereafter, when 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 the presser roller 25 is lowered by the presser foot lifting lever 22, a pressing force is applied to the material to be processed. The material is clamped between the work surface and the presser roller. In this state, when a processing start switch such as a foot switch is operated, the amplification degree of the amplification circuit 36 becomes large and the ultrasonic vibration element 9 receives the ultrasonic wave because the operation switch 34 has been switched to the red side. A high frequency current is supplied to make the vibration amount of the vibration element 9 relatively large, and the machining horn 12 vibrates ultrasonically with a relatively large amplitude, and the presser roller 25 is rotated in one direction by the rotation of the motor 15. Ru. Therefore, the processed material is fed in one direction, and the processed material is continuously welded. At this time, the machining surface 13 of the machining horn 12
Despite the relatively low surface temperature between the machining horn 12 and the presser roller 25,
is ultrasonically vibrated with a relatively large amplitude, so that the processed materials are reliably ultrasonically welded. When the ultrasonic welding operation of the processed materials is continuously performed, the heat generated during the ultrasonic welding is accumulated in the roller 25a of the presser roller 25, and the temperature rises to exceed 70°C. The temperature indicating material mixed in during the molding process changes color from red to brown-purple.

During the ultrasonic welding work, the presser roller 25
When the operator detects a change in color and operates the pointer 34a of the operation switch 34 to position it on the brown-purple side of the indicator 34b, the width of the variable amplification degree intensifier 36 changes. Therefore, the amount of vibration of the ultrasonic vibration element 9 is reduced. Therefore, after the operation switch 34 is switched to the brownish-purple side, the presser roller 25 and the processing surface 1
Although only relatively small amplitude ultrasonic vibrations are applied to the workpiece held between the rollers 25a and 3, the synergistic effect with the heat accumulated in the roller 25a causes the workpiece to receive the aforementioned ultrasonic waves. It is possible to perform ultrasonic welding that is substantially equivalent to that at the start of the welding process.

Thereafter, when the ultrasonic welding process is performed continuously, the temperature of the presser roller 25 is hardly lowered, the roller 25 takes on a brownish-purple color, and there is no need to operate the operation switch 34 in any way. However, when the welding operation is stopped, the operator can perform a substantially uniform ultrasonic welding process on the material to be processed by switching the operation switch 34 according to the discoloration status of the presser roller. I can give.

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, but the outer peripheral surface or side surface of the presser roller as a presser It is also possible to attach temperature-indicating paint or tape to the roller, and although we have shown an example in which only one type of temperature-indicating material is used, for example, if the roller is connected to the rotation line of the roller, A multi-layered structure divided by orthogonal planes is used, and various temperature-indicating materials that change color at different temperatures are mixed into each layer, or paints, tapes, etc. that change color at various temperatures are attached to the presser roller. It may also be attached by wearing or applying.

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 detailed above, the present invention provides a temperature indicating member whose color changes in response to the temperature of the presser roller, and also adjusts the amount of vibration applied to the processed material based on the color change. By configuring one or both of the transfer speeds of the material to be processed to be adjustable, the temperature of the presser roller can be easily and reliably identified, and the degree of welding of the material to be processed can be adjusted, allowing for both the start of welding and continuous processing. This method eliminates variations in the welding of processed materials during work and enables uniform welding at each welding location, which is highly effective.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment embodying 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 machining horn, 13 is a machining surface, 15 is a motor, 25 is a presser roller, 31 is a high frequency generator, 34 is an operation switch, and 37 is a variable amplification circuit. It is.

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. a transfer means for transporting the sheet-shaped processing material in one direction, the sheet-shaped processing material is pressed and clamped between the processing surface and the presser roller, and ultrasonic vibration is applied to the processing surface, and the sheet-shaped processing material is In an ultrasonic welding machine that continuously welds polymerized sheet-like processed materials by transporting the material in one direction, the above-mentioned temperature indicating member whose color changes in response to temperature changes is used. an operating switch that is attached to at least a portion of the presser roller and that can be manually operated; and in response to the operation of the operating switch, the amount of vibration of the processing surface based on the vibrator drive means and the sheet-like processing based on the transfer means. An ultrasonic welding machine characterized by being provided with an adjustment circuit that can adjust one or both of the material transfer speeds. 2. The presser roller includes a rotating shaft rotatably supported by a roller support disposed so as to be able to come into contact with and separate from the processing surface, and an endless roller made of a rubber-based elastic material and detachably attached to the rotating shaft. 2. The ultrasonic welding machine according to claim 1, wherein the temperature indicating member is made of a temperature indicating material mixed into the outer peripheral surface of the endless belt during molding of the endless belt.