JPH0218882A - Manufacture of brush piece - Google Patents

Abstract

PURPOSE:To enhance the contacting reliability by forming a slit wider than the specified terminal width by means of punching, and by folding a brush piece so that the two side terminals can intrude into each other's slit. CONSTITUTION:A slit 10 wider than the specified width is punched off in material parts 5a, 5b for contact so as to form a brush piece 17, which is then equipped with a terminal 9. The contact material parts 5a, 5b are formed by inlay clad or through-lay clad of contact material on in its symmetrical positions from and rear surfaces pinching the center line of mother material 4. Folding is made at the fold 7 so that the terminals 9 intrude into each other's slit 10. Thus the terminals 9 are located alternately between the slits 10 and aligned with a certain spacing held on the same plane. In this condition, the tips of the terminals 9 are cut while in alignment so as to prepare a brush piece. This process narrows easily the spacing between terminals 9 to accomplish a brush piece having many terminals 9, which provides good contacting condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a sliding brush piece used in a potentiometer, trimmer, micromotor, or the like.

(Prior art) Conventionally, after rolling a strip of sliding contact material made of a noble metal of a predetermined width onto a base metal base material to a predetermined thickness by rolling it to a predetermined thickness, As shown in Fig. 12, brush pieces were manufactured by press working into a brush shape.

Such a brush piece has 3 parts to improve contact reliability.
~5 flexible terminals 1 are formed, and slits 2 are provided so that the terminals 1 do not come into contact with each other. Generally, the width of the terminals 1 is about 0.2 rrm, and the slits 2 are O, It is approximately 1 to 0.2 m.

[Problem to be solved by the invention]

According to such conventional technology, the size of the slit width is limited by the press die, the manufacturing technique, the thickness and hardness of the brush material, etc., and of course it is technically extremely difficult to narrow the slit width. It is highly advanced.

Therefore, the width of the slit between the terminals of the brush piece directly affects the overall width, and as a result, in order to keep the total width of the brush piece within the standard dimensions, it is necessary to increase the number of terminals to improve contact reliability. The problem is that it is not possible to take a large amount of

[Means to solve problems]

The present invention forms terminals of a predetermined width on each contact material portion of a strip material inlay-clad or through-lay-clad with contact material at symmetrical or almost symmetrical positions on the front and back sides of the base material. Form a brush piece by punching out a slit with a width wider than the width of the terminal, and then bend this brush piece so that the terminals on both sides fit into each other's slits. The terminals are arranged alternately and aligned on the same plane, and adjacent terminals maintain a predetermined distance from each other, and the tips of the terminals are aligned and cut to form a brush piece.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 2A and 2B are perspective views of the strip used in the present invention, and FIG. 2A shows contact materials 5a at symmetrical or almost symmetrical positions on the front and back of the base material 4 constituting the strip 3.

5b is an inlaid clad strip, and (B) is a strip 3 in which the contact materials 5a and 5b are through-lay clad on the base material 4. The following description will be made with respect to the strip of (A).

The thickness of the brush piece is generally 50 μm to 150 μm.
The base material 4 is mainly made of phosphor bronze or nickel silver, and the contact materials 5a and 5b are generally made of Ag alloy, and their thickness is 1/2 to 1/2 of the thickness of the brush piece. 3
degree is widely used. In this embodiment, the thickness of the brush piece is 90 .mu.m, and the thickness of the inlaid contact material is 30 .mu.m by rolling.

The strip material 3 made in this way is wound around a bobbin in a coil shape, and the third
The local heating device 6 shown in the figure heats the longitudinal middle of the strip 3 in an atmosphere of Hz or N2 to prevent surface oxidation, so that the local surface temperature of the phosphor bronze reaches 400 to 500.
C. to a hardness of about 100 Hv, and a bent portion 7 is formed as shown in FIG. 4.

Note that at this time, distortion may occur in the strip 3 due to the influence of heat, so for a given thickness of the strip 3,
The flatness of the strip 3 can also be obtained by increasing the thickness by 0 to 15%, performing heat annealing under that dimension, and then rolling the strip 3 to finish it to a predetermined thickness.

Next, as shown in FIG. 5, the strip material 3 is press-worked with the contact material 5a facing upward, and the strip material 3 is intermittently fed by a material feeder to make a positioning pilot hole 8, and later a terminal 9 of the brush piece is formed. The width of this slit 10 is 0.03 smaller than the width of the terminal 9.
-0.05rms is set as wide. Note that the processing dimensions can be freely selected.

Furthermore, the slit 11 has a predetermined overall width dimension of the brush piece.
Punch out.

Furthermore, when spot welding the brush piece to a pedestal or the like, it is necessary to form projections on the strip 3, and at that time, escape holes 12 for the projections, which will be described later, are also punched out.

Next, as shown in FIG. 6, turn the strip 3 over and attach the contact material 5.
b with the upper surface, intermittent feeding is performed again using the positioning pilot 68, and a slit 10 for later forming the terminal 9 of the brush piece is punched out in the same manner as above, and the width of this slit 10 is also the same as that of the terminal 9. 0.03~0 from width
．． 05am is wide enough.

Further, as described above, the protrusion 13 for spot welding the brush piece to the pedestal or the like is formed at a position facing the escape hole 12.

Furthermore, a punch hole 14 is punched at a location corresponding to a predetermined full width dimension of one brush piece, and the center of this punch hole 14 is cut out along a cutting line 15, and the brush piece is held on the side edge 16 as shown in FIG. Material 17 is obtained.

One terminal 9 of the brush piece material 17 obtained in this way
As shown in FIG. 8, a bent portion 18 is formed by bending the base portion by approximately the thickness of the plate bone of the strip 3.

Therefore, as shown in FIG. 9, by bending the bent portion 7 of the brush piece 17 by 180° from the bent portion 18 side and processing the bent portion 7 closely together, the terminals 9 are arranged alternately in the slit 10 between the terminals 9 on both sides. The terminals 9 are located and aligned on the same plane, and a distance of 0.015 to 0.025 m is maintained between adjacent terminals 9.

Therefore, by cutting at the side edges 16, the tips of the adjacent terminals 9 are aligned, and a brush piece as shown in FIG. 1 is obtained.

In the above explanation, the strip material 3 was first pressed with the contact material 5a on the top surface, and then the strip material 3 was turned over and pressed with the contact material 5b on the top surface as shown in Fig. 10. This is to ensure that when the terminals are bent at the bending portion 7, the directions of sag due to the press are unified in the same direction, as shown in FIG.

In addition, in the case of a die in which the front and back punching directions are punched in the opposite direction using one progressive die, instead of separately punching from both sides of the strip 3 using two punching dies as described above, the bending part 7 can be punched as is. Even when folded, the direction of sagging due to pressing can be unified in the same direction. However, since the blanks punched from the bottom remain on the strip, the blanks may be disposed of by blowing out air, suctioning, wiping, or the like.

Although the above-described embodiment shows a flat brush piece used in a micro motor or the like, a brush piece with a bent sliding portion as shown in FIG. 11 is also applicable.

〔Effect of the invention〕

According to the present invention described in detail above, each contact material of a strip has contact materials inlay clad in symmetrical or almost symmetrical positions on the front and back sides of the base material, or through-lay clad contact materials symmetrically with respect to the base material. To form a terminal of a predetermined width, a slit with a width wider than that of the terminal is punched out to form a brush piece material, and this brush piece material is bent so that the terminals on both sides fit into each other's slits to fit tightly together. By processing, the terminals are arranged alternately in the slits between the terminals on both sides and aligned on the same plane, and adjacent terminals maintain a predetermined distance, allowing the tips of the terminals to be aligned and cut. By forming the brush piece by forming the brush piece, the terminal spacing can be easily narrowed compared to the conventional brush piece, and a brush piece with a standard width can have more terminals. Contact reliability will be greatly improved.

In addition, by punching out slits from the opposite sides of the two contact materials using press processing, when folded and processed closely, the terminals will be located alternately in the slits between the terminals on both sides, making them identical. When the terminals are aligned on a surface, the direction of the sagging caused during punching is unified in the same direction, and it has the effect that equal slits are formed between adjacent terminals.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a brush piece showing one embodiment of the present invention, FIGS. 2A and 2B are perspective views of a strip, and FIG. 3 is a side view of a state in which a bent portion is formed. Figure 4 is a plan view of the strip with bent parts formed, Figure 5 is an explanatory diagram of the front side punched out, Figure 6 is an explanatory diagram of the back side punched out, and Figure 7 is a plan view of the brush piece material. , FIG. 8 is a side view of the brush piece with a bent portion formed, FIG. 9 is a side view of the brush piece bent at the bent portion, FIG. 10 is an enlarged front view of the brush piece, and FIG.
Figure 1 is a side view showing an embodiment of the deformed brush piece;
The figure is a perspective view of a conventional example. 3... Strip material 4... Base material 5a - Contact material - Bent part - Terminal - Slit - Brush piece material Patent applicant Tokuriki Honten Agent Patent attorney Kyoji Kanakura (A) Rinkoku (B) Import ■ Export and national sleep 7゜ Contents of amendment 1゜ Specification, page 6, line 4. August 5, 1986: ``... ・It depends on whether you choose.'' is corrected to ``... ・It depends on your choice.''

Claims (2)

[Claims] 1. Each contact material is formed by inlaid cladding or throughlay cladding at symmetrical or almost symmetrical positions on the front and back sides of the base material,
A brush piece material is formed by punching out slits wider than the width of the terminal to form a terminal of a predetermined width, and by bending the brush material so that the terminals of the brush fit between the slits, the space between the terminals is The terminals are alternately positioned between the slits and aligned on the same plane, and adjacent terminals maintain a predetermined distance from each other, and the tips of the terminals are aligned and cut to form a brush piece. A method for manufacturing a brush piece, characterized in that: 2. Slits are punched out from the opposite sides of the two clad contact materials by press processing to form brush pieces, then the brush pieces are bent and the terminals are placed alternately in the slits between the respective terminals. 2. The method of manufacturing a brush piece according to claim 1, wherein the directions of sag generated during punching are unified in the same direction to form equal slits between adjacent terminals.