JP3107235B2 - Strip for punching sliding contacts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt material suitable for processing sliding contacts used in encoders for sensors, trimmers, potentiometers and the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, the above-mentioned sliding contact is stamped and formed from a strip material by a press, then fixed to a spring material 7 as shown in FIG. It was used as a sliding contact 5 '.

However, if the clearance of the press die is adjusted or the die is worn, as shown in FIG. 8, punch burrs 8 are likely to be generated at the front end during punching by the press, and the burrs are slid. The opposing substrate is scratched during operation, causing abnormal wear, and the contact resistance is increased, thereby significantly deteriorating the contact reliability.

[0004] For this reason, deburring of the tip portion has been performed, but the productivity has been poor and deformation has been caused.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an object to provide a strip material for punching a sliding contact which has good productivity, has no burrs at the tip end, and has stable contact without abnormal wear. To provide.

[0006]

According to the technical means of the present invention for solving the above-mentioned problems, one end face is rounded or both ends in the thickness direction are inclined.
It is formed into a corner having a (tapered) portion and is used for punching a sliding contact having the end face as a contact portion.

[0007]

According to the strip material for punching a sliding contact of the present invention having the above-mentioned structure, the end face is previously formed in a round shape or a plate thickness.
Since the corners having inclined (tapered) portions at both ends are formed and the contact portions are formed, no burrs are generated at the tip. In addition, since the end face is punched as a contact portion, it is possible to use a strip having a minimum width as compared with the conventional one, which is advantageous in terms of efficiency, yield, and cost. Furthermore, since the end face is formed by the band material, deburring is not required as in the related art, and the productivity is high without deformation. It should be noted that, as shown in FIG.
In addition to mechanical processing such as compression molding and cutting molding, chemical and mechanical polishing are appropriately performed. Of course, a composite (cladding) band joined at the end faces is also effective.
Furthermore, the present invention is also applied to the tip of an insertion / extraction connector as a sliding contact.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment and a conventional example will be described below.

First, as an embodiment, as shown in FIG.
g 30%, Pd 35%, Au 10%, Pt 10%, Cu 14%, Z
n1%, width 15mm, thickness 0.1mm, radius of curvature on one side edge 0.05R
As shown in Fig. 2, a strip 2 formed into a round shape 1 with a 4 mm length and a 0.15 mm width slit 0.5
Slitting is performed at a pitch of mm, and then bending and cutting and cutting are performed at the tip of the slit as shown in FIG. 3, and a sliding contact 5 having a length of 15 mm, a tip L portion 4 and a height of 0.5 mm, and four brushes is used. I got 100.

Further, as a conventional example, as shown in FIG. 5, a strip material 1 'is subjected to slit processing by press punching as shown in FIG. One sliding contact 5 'of the same size and shape
I got 00 months.

The following table was obtained as a result of the quality inspection.

[0012]

[Table 1]

As is apparent from the results, in the conventional example, burrs having an average length of 0.025 mm were generated at the contact portion, but no burrs were found in the embodiment.

[0014]

As is evident from the above results, according to the sliding contact punching band material of the present invention, the round end or the corner is formed in advance and the portion is formed as the contact portion. As a result, no burrs are generated at the tip end, so that a stable sliding contact can be obtained without abnormal wear, and since the end face is punched as a contact portion, efficiency and yield are good. Has an excellent effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sliding contact stamping strip according to one embodiment of the present invention.

FIG. 2 is a view showing a process of forming a sliding contact from a strip for punching a sliding contact according to the present invention.

FIG. 3 is a view showing a process of forming a sliding contact from a strip for punching a sliding contact according to the present invention.

FIG. 4 is a perspective view showing a strip for punching a sliding contact having a corner formed according to another embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional strip.

FIG. 6 is a view showing a process of making a sliding contact from a conventional strip.

FIG. 7 is a perspective view showing a state where a sliding contact is fixed to a spring material.

FIG. 8 is a perspective view showing burrs at the tip of a sliding contact.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Round shape 2 Strip material for punching sliding contact 3 Slit 4 Tip L part

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Claims (1)

(57) [Claims] 1. One end face is rounded or both ends in the thickness direction
Is formed into a corner having an inclined (tapered) portion, and is used for punching a sliding contact having the end face as a contact portion.