JPH0750202A - Manufacture of brush piece for sliding - Google Patents

Abstract

PURPOSE:To solve a problem to say that a part of a wire is broken due to the degree of the linearity of each wire of wires, which are aligned and focussed, and a bending work of the contact parts of the points of the wires and the points are scatteringly dispersed and are made uneven easily. CONSTITUTION:Two places on the periphery of a continuum 1 formed by winding a wire material, which consists of a noble metal or a noble metal alloy, a plurality of times into a coil form are welded together and thereafter, the continuum is cut at the two places to oppose to each other on the periphery to form as brush pieces 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing sliding brush pieces used in trimmers, potentiometers and the like.

[0002]

2. Description of the Related Art Sliding brush pieces used in trimmers, potentiometers, etc. are so-called multi-wire type brush pieces, as shown in FIG. 5, in order to increase the reliability and stability of electrical contact. It is composed by. In this brush piece manufacturing method, a so-called bus bar in which a large number of sliding wires pre-aligned and bundled are arranged at regular intervals is welded, then cut, and the tip contact portion is bent into a semicircular shape to be formed. .

[0003]

According to such a conventional technique, since the strands are thin wires having a diameter of about 0.08 mm, the strands are aligned and focused, and the straightness of the strands and the bending of the tip contact portion cause the strands to bend. There is a problem that some of them tend to be broken or the tips are scattered and uneven.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention is to weld two peripheral portions of a continuous body formed by winding a wire made of a precious metal or a precious metal alloy into a coil shape and then cut the continuous body at two opposing peripheral portions. It is characterized by being made into a brush piece.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a thin wire wound in a circle, and FIG. 2 is a perspective view of a brush piece. A thin wire made of 30WT% Ag-40WT% Pd-30WT% Cu with a diameter of 0.08 mm was wound multiple times in a coil shape with a diameter of 3 mm (6 times in this example) to form a continuous body 1. After welding the surrounding portions 2 facing each other, a symmetrical portion deviated from the welding portion was cut as a cutting portion 3 to obtain two brush pieces 4.

It should be noted that the cutting point may be any point within a range of 90 ° with the welding point, and the welding point does not have to be the exact symmetrical position facing each other. Quality inspection was performed on 500 brush pieces thus obtained, and the results are shown in Table 1. At the same time, as a comparative example, six thin wires of 0.08 mm in diameter made of 30 WT% Ag-40 WT% Pd-30 WT% Cu similar to those in the above-described example were aligned and focused by a conventional technique, and a thickness of 0.2 mm,
The base of a bus bar made of 80 WT% Cu-20 WT% Ni having a width of 0.5 mm and a length of 1 mm was welded and then cut, and the tip contact portion was bent into a shape similar to that of the above-mentioned embodiment.

[0007]

[Table 1] As is clear from Table 1, the brush pieces of the examples have no irregularities in the tips and the fine lines do not fall off, and are of stable quality.
On the other hand, the brush piece of the conventional example has a non-uniform tip and a fine wire is dropped off, and is of a quality having an unstable element.

The shape of the coil is not necessarily limited to a circular shape. For example, a continuous body 1 wound around a symmetrical deforming coil as shown in FIG. 3 may be formed. In this case as well, the peripheral symmetrical portion is welded. Then, by setting the symmetrical portion deviated from the welding portion 2 as the cutting portion 3, two brush pieces 4 were obtained, and the same inspection result as above was obtained.

[0009]

According to the present invention described in detail above,
After welding two points around the continuous body formed by winding a wire made of a noble metal or a noble metal alloy into a coil multiple times, and cutting it at two opposite points on the periphery to make a brush piece, this brush piece has a tip. It has the effect of providing good quality with no variation in the contact portion and no loss of fine wires.

Further, since the dimensional accuracy is high and the number of manufacturing processes is small, the brush piece has a high reliability.

[Brief description of drawings]

FIG. 1 is an explanatory view of a state in which a thin wire is wound according to a first embodiment.

FIG. 2 is a perspective view of a brush piece.

FIG. 3 is an explanatory diagram of a state in which a thin wire is wound according to the second embodiment.

FIG. 4 is a perspective view of a brush piece.

FIG. 5 is a perspective view of a brush piece showing a conventional example.

[Explanation of sign]

 1 Continuum 2 Welding point 3 Cutting point 4 Brush piece

Claims (1)

[Claims] 1. A brush piece is formed by welding two peripheral portions of a continuous body formed by winding a wire made of a precious metal or a precious metal alloy into a coil shape a plurality of times and then cutting the continuous body at two opposing peripheral portions. And a method for manufacturing a sliding brush piece.