JPS6229216B2 - - Google Patents

Abstract

PURPOSE:To enable continuous welding of material more than 0.1mm. thick by connecting a driving horn squarely to the center of one surface of a rotating disc-shaped tool horn to arrange a disc-shaped pedestal rotating at the same circumferential velocity as the horn at the loop position point of the deflecting vibration thereof. CONSTITUTION:When integrating a disc 11 and a driving horn 3, a tool horn 4 rotates on the axis line of the driving horn 3 and apply longitudinal vibration to the driving horn, a circular deflecting vibration is generated in the disc 11. When a disc-shaped pedestal 12 turning at the same circumferential velocity as the tool horn is arranged as opposed thereto at the loop position point 14 of the vibration 13, the deflecting vibration can be utilized most efficiently. In addition, the width of the pedestal 12 can be 70-80% of the amplitude thereof and the proper selection of the diameter and thickness of the disc 11 and the service frequency enable the generation of a deflecting vibration of 2-8 order mode. Thus, a plurality of weldin lines can be formed continuously on a plastic sheet at a desired interval.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously forming weld lines in stacked plastic sheets by means of ultrasonic vibrations.

Conventionally, the apparatus shown in FIG. 1 has been used to form a continuous weld line in stacked plastic sheets.

This device consists of an ultrasonic oscillator 1, a vibrator 2 that converts the electric vibration energy of the ultrasonic waves generated by the ultrasonic oscillator 1 into mechanical vibration energy, and a vibrator 2 that is connected to the vibrator 2 and that changes the vibration displacement of the vibrator 2. (amplitude); a tool horn 4 connected to the drive horn 3 for processing the workpiece;
A tip 5 provided on the part of the tool horn 4 that comes into contact with the workpiece, a pedestal 9 fixedly arranged opposite to the tip 5, and a flange provided on the drive horn 3 are combined, and the vibrator 2 and A case 6 for enclosing a part of the drive horn 3 and coupling it to a pressurizing device.
A plastic film 10 is sandwiched between a chip 5 and a pedestal 9, and ultrasonic vibrations are applied to the plastic film 10 through the chip 5 using a tool horn 4 to press it toward the pedestal 9. Meanwhile, from the supply device 8 by the winding device 7,
The plastic film 10 is moved toward the winding device 7 to form a continuous weld line on the plastic film 10. Figure 2a,
b shows the front and side views of the chip 5. Chip 5
When ultrasonic vibration is applied, the friction between the pedestal 9 and the plastic film 10 is reduced to about 1/100 of that when no ultrasonic vibration is applied. Also, the plastic film 10 can be moved smoothly. However, the thickness of one plastic film that can be welded by this device is up to 0.1 mm, and it is not possible to weld continuous plastic films that are thicker than this.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ultrasonic continuous plastic welding device that can continuously weld plastic films each having a thickness of 0.1 mm or more.

In order to achieve this object, the present invention includes a tool horn which is connected to a drive horn perpendicularly to the center of one flat surface of a disc and is rotatable about the center line of the drive horn by a drive device; A disc-shaped disk, which is arranged so that its cylindrical surface faces a loop position point of flexural vibration generated by a drive horn of the plate, and is rotated by a drive device at the same circumferential speed as the loop position point. This is an ultrasonic continuous welding device equipped with a cradle.

FIGS. 3 and 4 are a side view and a perspective view showing one embodiment of the apparatus of the present invention. A driving horn 3 is connected perpendicularly to the center of one flat surface of the disc 11 to form a tool horn 4. This tool horn 4
The disc 11 and the drive horn 3 are integrated and driven by a drive device (not shown).
It is provided so that it can rotate around the center line of the axis. Drive horn 3 along the center line of drive horn 3
When longitudinal vibration is applied to the disk 11, the disk 11 generates an annular flexural vibration centering on the drive horn 3. FIG. 3 shows a state in which a second-order mode flexural vibration 13 is applied to the disc 11. Loop (belly) of deflection vibration 13
At the position point 14, the flexural vibration 13 applied to the disk 11 by the drive horn 3 can be utilized most efficiently.

Therefore, in the present invention, the disc-shaped pedestal 12 is arranged so that its cylindrical surface faces the vibration loop position point of the disc 11, and the pedestal 12 is arranged so that its cylindrical surface has a circumferential velocity of the loop position point 14. It is provided so that it can be rotated by a drive device (not shown) at the same circumferential speed.
The width (thickness) of the pedestal 12 can be set to about 70 to 80% of the vibration displacement (amplitude) of the loop position point 14. By selecting the diameter and thickness of the disc 11, and the frequency of the ultrasonic vibration used, it is possible to generate flexural vibrations in the 2nd to 8th modes in the disc 11, thereby making it possible to create vibrations in the plastic sheet at desired intervals. It is also possible to form a plurality of weld lines in succession.

According to the device of the present invention, as shown in FIG. 4, a plastic sheet 10 is sandwiched between a tool horn 4 and a disc-shaped pedestal 12, and while the disc 11 is flexibly vibrated, the disc 11 and the pedestal are By rotating 12, it is possible to provide an inexpensive apparatus capable of continuously welding plastic sheets each having a thickness of 0.1 mm or more, which was previously impossible using ultrasonic vibration.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional continuous ultrasonic welding device for plastic sheets, Figures 2a and b are front and side views of the tip portion in Figure 1, and Figure 3 is an illustration of an embodiment of the device of the present invention. A front view of the main part, and FIG. 4 is a perspective view of FIG. 3. 1... Ultrasonic oscillator, 2... Vibrator, 3... Drive horn, 4... Tool horn, 5... Chip, 6
... Case, 7 ... Winding device, 8 ... Supply device,
9... pedestal, 10... plastic film, plastic sheet, 11... disc, 12... disc-shaped pedestal, 13... deflection vibration, 14... loop (belly) position point.

Claims (1)

[Claims] 1. The deflection caused by the tool horn, which is connected to the drive horn perpendicularly to the center of one flat surface of the disc and can be rotated around the center line of the drive horn by a drive device, and the drive horn of the disc. A disk-shaped pedestal is arranged such that a cylindrical surface faces a vibration loop position point, and the cylindrical surface is rotated by a drive device at the same circumferential speed as the loop position point. An ultrasonic plastic continuous welding device characterized by: