JPS6253335B2 - - Google Patents

Abstract

PURPOSE:To enable a continuous welding satisfactorily by a method wherein a driving horn is connected squarely to the center of a disc-shaped tool horn to turn it with the horn as the rotating shaft and a disc-shaped pedestal turning at the same circumferential speed as it is arranged so that the cylindrical surface of the tool horn and that thereof comes closer to each other. CONSTITUTION:A disc-shaped tool horn 11 has a driving horn 3 connected squarly to the center thereof integrally and rotates on the axis line thereof. A disc- shaped pedestral 12 rotating at the same circumferential velocity as the tool horn is arranged as opposed to the tool horn 11 so that each other's circumferential surfaces comes closer and when the driving horn vibrates longitudinally sandwiching plastic films 10, the tool horn 11 generates a circular deflecting vibration to fuse the films 10 together. Thus, a thick sheet more than 0.1mm. thick, for instance, previously impossible to fuse, can be fused continuously and at a high speed.

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) and a drive horn (also referred to as a fixed horn or booster horn) and a drive horn 3,
A tool horn 4 for machining a workpiece, a tip 5 provided at a portion of the tool horn 4 in contact with the workpiece, a pedestal 9 fixedly disposed opposite to the tip 5, and a drive horn 3. The case 6 is connected to a flange provided on the chip 5 and the case 6 surrounds a part of the vibrator 2 and the drive horn 3 and connects them to a pressurizing device. Insert the film 10 and attach the tool horn 4.
plastic film 1 through chip 5
While applying ultrasonic vibration to the holder 9, the plastic film 10 is moved from the supply device 8 to the winding device 7 by the winding device 7, and the plastic film 10 is continuously coated. It is designed to form a weld line. Figure 2 a, b
The front and side views of the chip 5 are shown in FIG. When ultrasonic vibration is applied, the friction between the chip 5 and pedestal 9 and the plastic film 10 is reduced to about 1/100 of that when no ultrasonic vibration is applied, so the chip 5 and pedestal 9 are rotated in the form of rollers. Even without it, the plastic film 10 can be moved smoothly. However, the thickness of a plastic film that can be welded by this device is up to 0.1 mm, and it is not possible to weld continuous plastic film that is thicker than this. The reason for this is that when the plastic film has a thickness of 0.1 mm or more, the tip 5 shown in Figs. 1 and 2, when the tool horn 4 contracts,
Since the plastic film 10 is no longer completely separated from the film surface, the friction between the plastic film 10 and the chip 5 is no longer reduced, resulting in a decrease in processing speed.Furthermore, as the thickness increases, the chip 5 moves closer to the film 1.
This is because it becomes immobile and cannot be welded as it becomes embedded in the zero.

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 is provided with a drive horn connected at right angles to the center of a flat surface, and provided so as to be rotatable about the center line of the drive horn by a drive device, so that the deflection caused by the drive horn is A tool horn consisting of a disk formed with a diameter at or near the vibration loop position, and a tool horn and a cylindrical surface arranged close to each other and facing each other, and rotated by a drive device at the same circumferential speed as the tool horn. The object of the present invention is to construct an ultrasonic plastic continuous welding device equipped with a disk-shaped pedestal provided so as to extend over the wall.

FIG. 3 is a perspective view of the main parts of the device of the present invention, 1
1 is a tool horn consisting of a disk; tool horn 11;
A driving horn 3 is connected perpendicularly to the center of one flat surface of. The diameter of the tool horn 11 is formed so that when the drive horn 3 vibrates longitudinally, it will be at or near the loop position of the flexural vibration centered on the drive horn 3. The tool horn 11 and the drive horn 3 are provided so as to be able to rotate together by a drive device (not shown) about the center line of the drive horn 3 as an axis. Reference numeral 12 denotes a disc-shaped pedestal, which is arranged so that its cylindrical surface and the tool horn 11 are close to each other and face each other, and is provided so that it can be rotated by a drive device (not shown) at the same circumferential speed as the tool horn 11. There is. As shown in FIG. 3, when the plastic film 10 is sandwiched between the disc-shaped pedestal 12 and the tool horn 11 and the drive horn 3 is vertically vibrated along the center line, the tool horn 11 is moved with the drive horn 3 as the center. The cylindrical surface of the outer periphery rubs and vibrates against the plastic film 10 to melt the plastic film 10 and fuse the upper and lower two sheets together. let Therefore, the tool horn 11 and the disc-shaped pedestal 1
By rotating the plastic film 10 at a speed such that the two circumferential surfaces have the same circumferential speed, a weld line can be continuously formed on the plastic film 10.

In the present invention, by the disk-shaped tool horn 11,
By applying tapping vibrations to the film surface, such as the tip 5 in Figure 1, it is possible to heat the inside of the film at the same time as the surface of the film, making it possible to weld continuous thick sheets that could not be welded using conventional ultrasonic continuous welding equipment. It becomes possible to weld at a faster speed than before. When the outer diameter of the tool horn 11 is made to match the loop (antinode) position of the flexural vibration generated in the tool horn 11, the largest amplitude can be obtained, and the longitudinal vibration of the drive horn 3 can be used most efficiently. However, the closer you get to the node of the flexural vibration, the smaller the amplitude becomes, so if you raise the temperature rapidly like a vinyl chloride sheet, the vibration will shift slightly inward or outward from the vibration loop position for a sheet that carbonizes or foams. By appropriately selecting the outside diameter of the tool horn 11 so that the tool horn 11 is at the loop position, it is possible to melt gradually from the surface, and although the welding speed is slower than when the outside diameter is set at the loop position, carbonization and foaming can be avoided. Continuous welding is possible.

Note that the loop position of the bending vibration of the tool horn 11 can be changed by selecting the thickness of the tool horn 11 and the frequency of the longitudinal vibration applied to the drive horn 3.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional continuous ultrasonic welding device for plastic film, Fig. 2 a and b are front and side views of the tip portion of Fig. 1, and Fig. 3 is a perspective view of the main parts of the device of the present invention. It is. 1... Ultrasonic oscillator, 2... Vibrator, 3... Drive horn, 4... Tool horn, 5... Chip, 6... Case,
7... Winding device, 8... Feeding device, 9... cradle, 10...
Plastic film, 11... Tool horn, 12
...Disk-shaped pedestal.

Claims (1)

[Claims] 1. A drive horn is connected at right angles to the center of a flat surface, and the drive horn is installed so that it can rotate around the center line of the drive horn by a drive device, and the loop position of the flexural vibration produced by the drive horn is the diameter of the vicinity. A tool horn consisting of a formed disc, and a disc-shaped receiver arranged so that the tool horn and the cylindrical surface face each other in close proximity and can be rotated by a drive device at the same circumferential speed as the tool horn. An ultrasonic plastic continuous welding device characterized by being equipped with a stand.