JPS6218426Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention is based on a thermoplastic material polymerized between a machining horn having a machining surface that vibrates ultrasonically and a presser metal fitting that is arranged so as to be pressable toward the machining surface. The present invention relates to an improvement in a presser fitting for an ultrasonic processing machine which is configured to clamp a workpiece made of a synthetic resin material and continuously weld the workpiece by the frictional heat generated at the time.

[Prior Art] Conventionally, the presser fittings in this type of ultrasonic processing machine have been manufactured from iron or metal materials. Therefore, for example, as shown in FIGS. 1A and B, workpiece materials P and Q having a step part a, such as two thermoplastic sheet materials whose side edges are bent and overlapped with each other, are used. Step part a
In the case where the film sheet material R covering the film sheet material R and the thermal adhesive film S inserted between them are thermally welded to each other, since the holding metal fitting is a rigid body, the holding metal fitting V and the tool horn U located below it are The pressing force on the welded part is not uniform, and when the pressing force is set so that the welding condition is good at the stepped part a, the welding is completely completed in the parts b and c adjacent to the stepped part a. If the pressing force of the presser fitting V is increased in an attempt to maintain a good welding condition at the portions b and c, the film sheet R located above the stepped portion a may be torn or the appearance may be deteriorated. It had defects that made it undesirable.

[Purpose] The present invention has been made to eliminate the above-mentioned defects, and is made of a rubber-based elastic material on the outer circumferential surface of the presser metal fitting, which is placed facing the machining surface of the machining horn that is subjected to ultrasonic vibration. By pasting the elastic member, when welding a workpiece having a stepped portion, the elastic material adhered to the presser fitting is deformed along the shape of the stepped portion, reducing the pressing force on the welded portion. It is an object of the present invention to provide an ultrasonic processing machine that can achieve uniform welding and excellent continuous welding even on workpiece materials having stepped portions.

[Example] Hereinafter, with reference to FIGS. 2 and 3 showing an example in which the present invention is embodied in an ultrasonic sewing machine,
The details will be explained below.

In Figure 2, 1 is a workbench that forms part of the machine frame, and bed 2 is a part of the workbench 1.
is fixed. A frame 3 is fixed to the lower surface of the bed 2, a pair of supports 4 are fixed to the frame 3, and an arm 6 having a head portion 5 extending leftward in the figure is fixed to the upper surface of the bed 2. A vibrator assembly 7 is supported on the pair of supports 4 so as to be rotatable around a vertical line.
is rotationally driven in one direction by a motor 8 fixed to the frame 3. The transducer assembly 7 also incorporates an ultrasonic transducer 9, which includes a pair of slip rings 10 fixed to the transducer assembly 7 and a pair of contacts 11 fixed to the frame 3. A high frequency current is supplied from a high frequency generator (not shown) to generate ultrasonic vibrations. At the top of this ultrasonic transducer 9 is an amplification horn (not shown).
A machining horn 12 is connected via. The upper part of this processing horn 12 is formed into a cylindrical shape,
The annular processing surface 13, which is the upper end surface, vibrates ultrasonically in the vertical direction, and is exposed to the upper surface of the workbench 1 through a circular hole 14 formed in the bed 2. 1 and bed 2
It is placed so that it is on the same level as the top surface.

On the other hand, a machining surface 1 is provided at the bottom of the head portion 5 of the arm 6.
A presser roller 15 as a presser metal fitting is arranged so as to face the presser roller 3 . As shown in FIG. 3, this pressing roller 15 includes a metal (iron) roller part 16, an elastic material layer 17a made of foamed nitrile rubber attached to the outer periphery of the roller part 16, and the elastic material layer 1
The pressing roller 15, which is made of an elastic member 17 including an elastic material layer 17b made of silicone rubber that covers the outer peripheral surface of the head 7a, is attached to the head part 5 via a roller part 16.
The contact portion with the processing surface 13 is rotatably supported by a roller support 18 that is supported to be movable in the vertical direction, and is brought into contact with the processing surface 13 via belts 20, 21, shafts 22, etc. by a motor 19 fixed to the workbench 1. Machining surface 1
It is rotated in the same direction as No. 3. Note that 23 is a presser foot lifting lever for holding the roller support 18 in the upper position, and when it is lifted upward as shown in FIG. Machining surface 1
3. Hold it in an upper position where it does not touch.

Next, the operation of welding a workpiece having a stepped portion using the ultrasonic sewing machine configured as described above will be described.

First, the presser foot lifting lever 23 is operated by the operator to raise the presser foot roller 15 as shown in FIG. 2, and the side edges are bent and overlapped as shown in FIG. After the workpiece material consisting of the two sheets P and Q, the film sheet material R covering the stepped portion a, and the thermal adhesive film S inserted between them is placed on the processing surface 13, When the presser foot lifting lever 23 is operated again, the presser foot roller 15 is lowered. After that, when a foot pedal (not shown) or the like is operated, the motors 8, 1
9 are rotated together, power is supplied to the ultrasonic vibrator 9 from a high frequency generator (not shown), and the processing horn 12 starts ultrasonic vibration. At this time, each elastic material layer 17a, 17b of the elastic member 17 attached to the presser roller 15 has a fourth layer due to the elastic action of the portion that contacts the stepped portion a of the workpiece material.
As shown in the figure, it is recessed and deformed so as to come into close contact with the stepped portion a and adjacent portions b and c of the workpiece material. Therefore, a substantially uniform pressing force is applied to the stepped portion a and its peripheral portions b and c of the workpiece material, and the frictional heat generated by the ultrasonic vibrator 9 is distributed at each portion. As the motors 8 and 19 rotate, the workpiece material placed on the processing surface 13 is continuously transferred, and uniform welding is continuously performed at each part of the workpiece material. Ru.

Incidentally, in the above embodiment, the case where the stepped portion a of the workpiece material extends along the feed direction of the workpiece material based on the rotation of the presser roller 15 and the processing horn 12 is shown, but for example, if the stepped portion a is Even when welding workpiece materials that extend in a direction intersecting the feeding direction, the presser roller 15
Since the elastic member 17 affixed to is elastically deformed along the shape of the step, the same effect as described above can be obtained.

In addition, in the above embodiment, an example of welding a workpiece having a stepped portion is shown using a so-called ultrasonic sewing machine that welds the workpiece while continuously transporting the workpiece by rotation of the presser roller 15 and the processing horn. However, the present invention can also be applied to welding operations using a so-called ultrasonic welder, in which workpiece materials with protruding parts are welded spot-on without applying continuous transport motion to the workpiece materials.

Furthermore, in the above embodiment, the elastic member 17
Although a two-layer structure is shown in which the elastic material layer 17a is made of foamed nitonyl rubber and the elastic material layer 17b is made of silicone rubber, the elastic member 17 does not necessarily have a multilayer structure as described above, and may be made of, for example, silicone rubber. Even a single-layer structure according to the above method can be used to implement the present invention. Further, according to experiments by the present inventor, good results were obtained for the elastic material layer 17a not only with the foamed nitronyl rubber but also with nitrile rubber, fluorine rubber, silicone rubber, and the like. Further, as the elastic material layer 17b, when the material to be processed is welded, the elastic material layer 17b
Any rubber material may be used as long as it is not easily welded to b.

[Effects] As detailed above, the present invention has an elastic member made of a rubber-based elastic material attached to the outer peripheral surface of the presser metal fitting, which is placed opposite to the machining surface of the machining horn subjected to ultrasonic vibration. Even when welding a workpiece material that has a stepped part, the elastic member is deformed along the shape of the stepped part, and the pressing force on the welded part is equalized, so that the part of the workpiece material at the stepped part is deformed. It is possible to obtain an ultrasonic processing machine that can perform completely continuous welding without tearing the parts, has a favorable appearance, and has excellent effects such as being simple in structure and being able to be manufactured at low cost. It is something to play.

[Brief explanation of the drawing]

Figures 1A and B are both explanatory diagrams for explaining a workpiece material having a stepped portion, Figure 2 is a front view showing an embodiment embodying this invention, and Figure 3 is a main part of the invention. FIG. 4 is a front view for explaining the operation of the present invention. 1 is a workbench, 12 is a processing horn, 13 is a processing surface, 15 is a presser roller, 17 is an elastic member, 17
a and 17b are elastic material layers, and 24 is a compression spring.

Claims (1)

[Claims for Utility Model Registration] 1. Processing horn 12 connected to an ultrasonic vibrator
a machining surface 13 provided on the machining surface 13; a presser metal fitting 15 disposed opposite to the machining surface 13 and rotatable about an axis parallel to the machining surface 13; and operatively connected to the presser metal fitting 15; a pressing means 24 for pressing the presser metal fitting 15 toward the processing surface 13;
In the ultrasonic processing machine, the workpiece is continuously welded by pressing and holding the polymerized workpiece between the workpiece 3 and the presser metal fitting 15 and applying ultrasonic vibration to the workpiece, as described above. An ultrasonic processing machine characterized in that the presser metal fitting 15 has an elastic member 17 made of a rubber-based elastic member attached to its outer peripheral surface. 2. The elastic member 17 is composed of a first layer 17a made of a foamed rubber material provided on the surface to be attached to the presser metal fitting 15, and a silicone rubber material provided on the opposing surface. The ultrasonic processing machine according to claim 1, characterized in that it has a multilayer structure consisting of a second layer 17b and a second layer 17b.