JPS6243288B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical contact strip holding an electrical contact material having projections.

Conventionally, in order to make electrical contact materials with projections, one large sheet of material was punched and formed using multiple punches, so this electrical contact material with projections was welded to a base material by projection welding. When making electrical contacts, a device is required to align and supply the electrical contact materials in a line toward the base material.
Furthermore, it is necessary to provide this alignment and supply device with a device for distinguishing between the front and back sides of the electrical contact materials. Furthermore, the electrical contact material is extremely small and must be accurately fed to the welding location, making the device extremely complex.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to accurately feed the electrical contact material with projection to the welding position with the base material without requiring an alignment supply device or a front/back discrimination device. Another object of the present invention is to provide an electrical contact strip material in which electrical contact materials with projections are formed and held at regular intervals.

Hereinafter, one embodiment of the electrical contact strip material according to the present invention will be explained with reference to FIGS. A circular electrical contact material 5 having a ring projection 4 on the upper surface periphery is formed by punching at regular intervals using a circular punch 3 with a taper 2 on the periphery of the tip, as shown by the chain line, and pushing up as shown by the chain line. The electric contact material 5 is held in the punched hole 7 by the pushback of the pin 6, and the ring projection 4 is made to protrude from the punched hole 7.

Since the electrical contact strip 1 having such a structure holds circular electrical contact strips 5 having ring projections 4 at regular intervals, the electrical contact strip 1 can be inserted into the guide 8 as shown in FIG. 2, for example. If the material is fed horizontally through the material onto the lower electrode 10 of the resistance welding device 9, it will enter the underside of the base material 11 that has been sent to the resistance welding device 9 separately. When the electrical contact material 5 with the ring projection 4 is located at the center of the base material 11, the upper electrode 12 is lowered, the base material 11 is pressed against the ring projection 4, and the current is concentrated on the ring projection 4. flow, and the electrical contact material 5 is connected to the base material 11.
Projection welding is performed. In this case, continuous projection welding is possible if the interval between the electrical contact materials 5 with ring projections 4 held on the electrical contact strip 1 is equal to or greater than the pitch of the base material 11. be.

However, if the base material 11 is slightly tilted after welding, or if the electrical contact strip material 1 is bent, the electrical contact material 5 is extremely thin and can be easily removed from the punched hole 7 of the electrical contact strip material 1. The foremost punched hole 7 from which the electrical contact material 5 has been removed is used as a pilot for feeding the electrical contact strip material 1 into the resistance welding device 9 and for towing the electrical contact strip material 1' for scrapping after the electrical contact material 5 has been removed. be done.

For example, as shown in FIG. 3, an electrical contact strip material 1 that passes through a resistance welding device 9, holds an electrical contact material 5 that has been projection welded to a base material 11, is fed horizontally, and is then passed through a roll 12 and bent. As a result, the electrical contact material 5 is automatically removed from the punched hole 7 of the electrical contact strip material 1, and the electrical contact 14, in which the base material 11 and the electrical contact material 5 are joined, is housed in a box 13 installed in front of the roll 12. be done. After the electrical contact material 5 has been removed, the electrical contact strip material 1' for scrapping can be compacted by hooking the punched hole 7 to the protrusion 16 of the drum 15 and winding it up on the drum 15. Tsuba 1 on one side of
It can be easily removed by removing 5a.

Although the electrical contact strip material 1 is made of a single material in the above embodiment, it may be made of a composite material. Of course, in this case, the ring projection of the electrical contact material 5 is formed on the side opposite to the contact surface. Further, although the electrical contact member 5 with the ring projection 4 has a flat circular shape, it may also have a spherical shape that is not flat, or a prismatic shape that is not circular. Furthermore, the electrical contact material 5 with the ring projection 4 may be formed and held on the electrical contact strip material 1 in the opposite manner to the above. That is, the ring projection 4 of the electrical contact material 5 may protrude from the lower surface of the electrical contact strip material 1. In this case, table material 1
1 is supplied to the underside of the electrical contact strip 1.

Also, electrical contact material 5 with ring projection 4
The base material 11 for joining is not limited to a terminal material of a certain length, but may be a strip-shaped base material.
In this case, the strip-shaped base material is fed parallel to the electrical contact strip material 1, and the intermittent feeding speed is increased several times, so that the electrical contact material 5 with ring projection 4 is placed on the strip-shaped base material at required intervals. Immediately after joining, the band-shaped base material and the electrical contact strip material 1 are passed through a pair of upper and lower rolls, respectively, and the electrical contact material 5 with the ring projection 4 joined to the band-shaped base material is punched out of the electrical contact strip material 1. After removing it from the hole 7, the strip-shaped base material is cut into a fixed length for each electrical contact material 5, and the electrical contact strip material 1' for scrapping is preferably wound on a drum as described above.

As can be seen from the above description, in the electrical contact strip material of the present invention, the electrical contact material having projections is formed by punching at regular intervals in the longitudinal direction, and is held in the punched hole by a push back. By feeding this electrical contact strip material horizontally, the electrical contact material with projection can be fed to the required welding position at a constant pitch. In other words, since the electrical contact strip material can be used as a feed lead for the electrical contact material with projection, there is no need for an alignment supply device or front/back discrimination device for feeding the electrical contact material with projection into the required welding position. Further, as mentioned above, since the electrical contact material with projection can be fed horizontally, it is not welded tilted during projection welding with the base material, so that highly accurate electrical contacts can be manufactured. In addition, during welding, the electrical contact material with projection is held and positioned in the punched hole of the electrical contact strip material, so it is not necessary to process the electrical contact material with projection to position it on the pressing surface of the electrode as in the conventional method. is not necessary. Moreover, as described above, since the electrical contact material with projection is fed horizontally, the pressing surface of the electrode contacts the contact surface of the electrical contact material and the back surface of the base material in parallel. Therefore, since the electrodes are not worn unevenly, the electrical contact material with projection and the base material can be joined to each other while maintaining parallelism at all times.

Furthermore, in the electrical contact strip material of the present invention, after the electrical contact material with projection is joined to the base material, the electrical contact material can be easily inserted through the punched hole by tilting the base material or curving the electrical contact strip material. It has a number of excellent effects, such as being able to separate the electrical contact strip material from the electrical contact material and making it possible to collect scraps in a compact manner by winding up the electrical contact strip material after the electrical contact material has been detached onto a drum.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the electrical contact strip material according to the present invention, in which a is a plan view thereof, b is a vertical side view thereof, and FIG. 2 is a ring projector held by the electrical contact strip material of FIG. 1. FIG. 3 is a longitudinal cross-sectional view showing the welding state of the electrical contact material with an extension and the base material, and FIG. 3 is a schematic side view showing an example of the processing method after joining the electrical contact material with the ring projection and the base material. It is. 1...Electric contact strip material, 4...Ring projection, 5...Electric contact material, 7...Punching hole.

Claims (1)

[Claims] 1. Form an electrical contact material having protrusions on the periphery by punching the electrical contact strip material with a punch having a tapered tip at a constant interval in the longitudinal direction, and punch the electrical contact material into punched holes by pushing back. An electrical contact strip material, which is held in place so that the projection protrudes from the punched hole.