JPH0547635Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is used for joining synthetic resin strips of various configurations, such as repairing broken parts of synthetic resin fishing nets or connecting synthetic resin wire rods. The present invention relates to an ultrasonic welding tool.

[Prior Art] Synthetic resin fishing nets are mainly knitted from nylon threads, but they often break during use. In order to repair this broken part, conventionally, the broken part is mended with a repair thread prepared separately.

[Problems to be solved by the invention] As mentioned above, in the past, since the repair thread was used to simply repair the broken part, it had the disadvantage that the strength was low and the repaired part could easily break again.

This idea was created in view of the above problems.
The object of the present invention is to provide an ultrasonic welding tool that can easily and firmly join articles using various synthetic resin strips, such as synthetic resin fishing nets.

[Means for Solving the Problems] The present invention is composed of an ultrasonic vibrator having a holding groove carved into the side surface of the tip of the horn, and a pressing member having a pressing projection at a position facing the holding groove. , the respective ends of a pair of synthetic resin strips to be joined are placed in the holding groove so as to overlap each other, and are held under pressure by the pressing protrusion, and each of the strips is driven by an ultrasonic vibrator. The overlapping parts of the two are ultrasonically welded.

This holding groove also includes one formed in a concave shape or a V-shape.

[Operation] When an alternating voltage of a predetermined frequency is applied to the ultrasonic vibrator, ultrasonic vibration is generated at the tip of the horn. This ultrasonic vibration is applied to the overlapping portions of the respective strips that are compressed by the holding groove and the pressing protrusion, and the overlapping portions rub against each other and generate heat. This thermal effect softens and melts the polymerized portion, and the strips are firmly bonded together.

Therefore, when repairing a synthetic resin fishing net, the strips to be joined that have broken during use are pulled together, placed in the holding grooves, and held under pressure by the holding protrusions, then the ultrasonic vibrator is used. Repair work can be performed by driving the .

In addition, when connecting multiple synthetic resin wire rods in series or bundling them in parallel, ultrasonic vibration is applied while the overlapping portions of these strips are held under pressure between the groove and the holding projection. All you have to do is drive the child.

[Example] Embodiments of the present invention will be described based on the drawings.

In FIG. 1, P indicates an ultrasonic welding tool, which is composed of an ultrasonic vibrator 1 and a clamping member 2. The ultrasonic transducer 1 here includes a Languevin type transducer operating in a longitudinal vibration mode and a horn 11 extending in a step shape from one end of the ultrasonic transducer 1.
In short, any type of structure may be used as long as it exhibits longitudinal vibration by applying an alternating voltage of a predetermined frequency and causes an enlarged vibration displacement at the tip of the horn 11.

A holding groove 12 extending in a direction perpendicular to the axes of the ultrasonic transducer 1 and the horn 11 is carved on a side surface close to the tip of the horn 11 . This holding groove 1
2 holds the strips 3a, 3b to be joined with their ends overlapped with each other.

Further, the clamping member 2 can perform a clamping operation together with the ultrasonic vibrator 1, and is further provided with a presser protrusion 21 at a position facing the holding groove 12 of the horn 11.
is provided. This pressing projection 21 is used to press from above so that the overlapping portion s of each strip held in the holding groove 12 does not come off, but the shape and dimensions are set so that it does not come into contact with the holding groove 12. There is. This is because when the presser projection 21 comes into contact with the holding groove 13, the ultrasonic vibration at the tip of the horn leaks to the outside through the presser projection 21, and the ultrasonic vibration is not effectively applied to the overlapping portion s of the strip, achieving the desired ultrasonic welding. Because you can't.

When the cross-sectional shape of the holding groove 12 is a concave shape 12a, as shown in an enlarged view in FIG.
It can be held in contact with the V-shaped 12
In the case of b, as shown in FIG. 3, strips 3b having a relatively large wire diameter can be held so as to overlap in the lateral direction (in the direction of juxtaposition). Furthermore, when the V-shaped groove 12b is provided on the outside and the concave groove 12a is provided on the inside, as shown in FIG. Can be selected and retained. Furthermore, since the V-shaped groove 12b constantly presses the overlapping portion s of the strip 3b due to the action of its inclined surface, there is an advantage that ultrasonic vibration can be applied to the overlapping portion s without loss.

As a continuation, FIG. 5 shows an embodiment in which the ultrasonic welding tool P shown in FIG. The horn 11 is housed in the case 4 and the tip of the horn 11 is made to come out from the case 4, and an annular flange 13 is formed at the vibration node position of the vibrator, and an O-ring 14 is fitted to the outer periphery of the vibrator at an appropriate location. It is fixed to the case. Further, one end of the clamping member 2 made of a flexible material is fixed in a cantilever manner to the outer end of the gripping case 4 on the horn side,
The other end has a presser protrusion 21 attached to face the holding groove 12 at the tip of the horn 11, and the presser protrusion 21 is attached to the holding groove 12 at the tip of the horn 11.
1 is pressed against the overlapping portion of the strips held in the holding groove 12, and after ultrasonic welding, the holding projection 21 is separated from the holding groove 12 and returns to its original position due to the elastic return of the holding member 2. ing.

By the way, input power 3~4W, resonance frequency 60k
A V-shaped groove with a depth of 2 mm, a depth of 1 mm, and a base angle of 120 degrees is carved on the side of the horn tip (diameter 6.5 mm) of a Languevent type vibrator for vertical vibration at Hz, and the diameters are (A) 0.47, ( (b) 0.57 and (c) 0.66, each end of a pair of nylon threads is overlapped to a length of 5 mm, and this overlapping part is held under pressure by the V-shaped groove 12b and the presser protrusion 21. After driving the vibrator to apply ultrasonic vibration, the tensile strength of the overlapping portion was measured, and a high strength of 2 to 2.5 Kg/mm ² was obtained for all wire diameters.

[Effects of the invention] As described above, the present invention has a pair of synthetic resin strips fitted into a holding groove cut into an ultrasonic transducer, and a presser protrusion provided on a pressing member inserted into the holding groove. The pair of synthetic resin strips are welded together by inserting the strips into the plastic and applying ultrasonic vibration while holding the strips under pressure. Ideal for repairing fishing nets and joining synthetic resin wire rods.

Further, by adopting the grip type configuration as shown in FIG. 5, it becomes portable, and there is an advantage that such repair work and joint work can be performed relatively easily and quickly.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an ultrasonic welding tool P showing an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3
These figures and FIG. 4 are enlarged views of the main parts of other embodiments of the present invention in the same manner as in FIG. 2, and FIG. 5 is a cross-sectional view of the main parts of an ultrasonic welding tool P configured as a grasping type. P... Ultrasonic welding tool, 1... Ultrasonic vibrator, 2
...Press member, 3a, 3b...Strip, 11...Horn, 12...Holding groove, 12a...Concave groove, 12b
...V-shaped groove, 21...presser projection.

Claims (1)

[Claims for Utility Model Registration] 1. An ultrasonic vibrator having a retaining groove carved into the side surface of the tip of the horn for attaching each end of a pair of synthetic resin strips to be joined by overlapping each other. , a pressing member provided with a presser protrusion that is fitted into the holding groove and holds the pair of synthetic resin strips in the holding groove under pressure, at a position facing the holding groove; An ultrasonic welding tool characterized in that the overlapping portions of the respective strips are ultrasonically welded by driving. 2. The ultrasonic welding tool according to claim 1, wherein the holding groove is a V-shaped groove. 3. The ultrasonic welding tool according to claim 1, wherein the holding groove is a concave groove.