JP2729808B2 - Manufacturing method of integrated sliding brush - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a brush for transmitting an electric signal or a sliding brush for a micromotor in combination with a resistor, a slip ring, or the like as a potentiometer, a trimmer, and an encoder. And a method for producing the same.

[Conventional technology]

A method of manufacturing a brush assembly by arranging a plurality of fine wires in parallel in a horizontal state and welding them to a substrate is already known, for example, as described in JP-B-60-16718. In this method, after welding the wire to the bar connecting the two straps, to cut both ends of the bar,
There is a problem that a secondary force is inevitably applied to the welded portion, the welding strength is reduced, distortion remains, and the like, which adversely affects the welded portion.

In addition, the above-mentioned method of arranging wires composed of a large number of fine wires in parallel with a suspension band and welding them to a substrate is not economical because unnecessary wires need to be cut after welding, and the welding process is difficult to see. There is.

Further, when the shape of the mount portion of the spring pedestal constituting the brush assembly is large or complicated, a single brush is manufactured by first welding a brush to a metal piece, and then forming a part of the spring pedestal. Although the secondary welding was performed on the spring portion, the spring pedestal had two pieces, which made the process complicated, and it was difficult to automate the secondary welding, and there were many problems in accuracy.

[Problems to be solved by the invention]

Therefore, according to the present invention, a secondary force is hardly applied to a welded portion at the time of cutting, the welding strength is reduced, distortion remains, and the like, without adversely affecting the welded portion and unnecessary wire loss is less likely to occur. An object of the present invention is to provide a method for manufacturing an integrated sliding brush. In particular, it is another object of the present invention to provide a method for manufacturing an integrated sliding brush for integrally manufacturing a mount part having a complicated shape and a spring part.

[Means for solving the problem]

The present invention, unlike the conventional method, forms the substrate for the brush assembly in a form capable of supplying a wire from a direction orthogonal to the direction of transport of the strap and welding the wire to the projection, and widening the strap, It has been made based on the finding that the above-mentioned problem can be solved efficiently by adopting a method of punching out a mount portion from a suspension band after welding a wire to a projection.

Therefore, in the present invention, the spring portions of the spring pedestal of the brush assembly are provided at substantially equal intervals on one side of the suspension, and at least one row of projections is provided at the tip of the spring portion in parallel with the suspension. After transferring the substrate for the brush assembly from one direction, supplying the wire from a direction perpendicular to the transfer direction and welding the wire on the projection, punching out the mount of the spring pedestal from the strap connected to the spring. The present invention provides a method for manufacturing an integrated sliding brush, characterized in that a sliding brush is manufactured by using the sliding brush.

Next, a method of manufacturing the sliding brush of the present invention will be described using an embodiment. FIG. 1 is an enlarged schematic view of a sliding brush manufacturing substrate (brush assembly substrate) 1 used in the present invention, and a spring portion forming a spring pedestal at substantially equal intervals on a side surface of a suspension band 2. 4 is provided so as to protrude to the side of the suspension band 2, and a row of projections 6 is provided at a distal end portion 5 of the projection 6 substantially parallel to the suspension band 2. The projection 6 is for welding a wire 8 composed of a thin wire 7 as described later. Although the surface of the projection 6 may be flat, the projection (for example, a height of 30 to 50 μm) such that a wire 8 composed of, for example, six thin wires 7 (circular in section) having a diameter of 120 μm is firmly fixed.
A recess having a depth of, for example, about 30 μm can be formed thereon. That is, in this way, the thin wires can be closely and uniformly welded without displacement of the thin wires during welding, and stable welding strength can be obtained for each wire.

Although FIG. 1 shows an example in which the projections are provided on the single-row spring portion, in the present invention, two or more projections can be provided on the spring portion. In particular, it is preferable to provide two or more rows of projections because welding defects can be reduced when welding a wire.

The projection is provided as a portion protruding above the spring portion, and can be formed by a method using a press process. In addition, any shape can be used as long as the shape of the projection protrudes above the spring portion and the wire can be welded.A flat wire is used as the wire, and the wire is welded to the projection at an interval of, for example, 50 to 300 μm without close welding. If the projection is
In the form shown in the figure (showing an enlarged view of the spring portion), there is an advantage that the life of the welding electrode is prolonged because the molten unnecessary matter accumulates in the depression 9 and does not adhere to the welding electrode.

The rectangular wire used here has a width of 150 to 300 μm and a thickness of 50 to 100 μm. Also, as projection, width (W) 150-300 μm, length (L) 150-3
One having a thickness of 00 μm and a height of 20 to 50 μm is used.

In the present invention, for example, as shown in FIG.
A spring portion 4 is connected to a side of a plate-like suspension band 2 of μm (the width is determined by the size of the mount, and the length is arbitrary, but generally 5 to 20 m is used). However, the spring portion can be formed in a shape conforming to the shape of the spring base in the final shape other than that shown in FIG. FIG. 1 (a) is a view in which a wire 8 is partially welded to a projection 6 of a distal end portion 5 of a spring portion 4, and FIG. 1 (b) is a cutaway line 10 in FIG. 1 (a). Along the line, a view is shown in which the strap is punched out, and the mount 16 is formed from the strap to produce the final product 15.

Therefore, in the present invention, since the spring portion forms a part of the final pedestal, there is an excellent advantage that the strap can be used as it is if the strap is punched out sequentially by pressing along the cutting line indicated by 10. That is, in the conventional method, the wire rod is cut off after welding to form a single brush, and the single brush must be attached to the spring pedestal by secondary welding in order to form a brush assembly. Since work can be omitted and there is no room for intervention in accuracy in secondary welding, both workability and quality are significantly improved.

In order to facilitate the movement of the substrate, the suspension band 2 may be provided with pilot holes 11 for positioning at predetermined intervals.

In the present invention, using the above-described brush manufacturing substrate, the substrate is transferred from one direction, the wire is supplied from a direction perpendicular to the transfer direction, and the wire is welded on the projection, and then the spring portion is connected. The mounting portion of the spring pedestal is punched from the suspension band to manufacture a sliding brush. In particular,
It is manufactured by the manufacturing method shown in FIG. 3 and FIG. According to this method, the width of 200 μm and the thickness of 7
The wire 8 composed of three rectangular wires 7 of 0 μm passes through the width guide 21 and is intermittently fed to the projection 6 from the direction perpendicular to the transport direction of the suspension band 2 by the flat wire feeder 22 which feeds the wire to a fixed length. Sent out for welding. On the other hand, apart from the wire 8, the continuous substrate 1 passes through the substrate guide 23,
The wires 8 are sequentially sent out at right angles to the alignment surface of the aligned wires 8 and in conjunction with the cycle motion in which the wires 8 are sent out. The wire 8 fed in conjunction therewith is overlaid on the projection on the substrate 1 and welded by the welding device 24. still,
In the welding device 24, the upper electrode 24a is lowered, the substrate 1 is pressed, and the alignment wire 8 on the lower electrode 24b is welded to the projection section 6.

Thereafter, the groove guide 28 descends, the upper cutter 26 descends, and the plurality of rectangular wires 8 are simultaneously cut off with the lower cutter 25. Next, the upper cutter 26 is raised, the spring portion 4 is transported at regular intervals by the spring portion feeder 27, and the next spring portion 4 is set between the upper and lower electrodes 24. Thereafter, the plurality of rectangular wire rods 8 are fed to the fixed length by the rectangular wire rod feeder 22, and guided on the projection 6 of the spring portion 4. Further, the spring portion 4 is synchronized with the one transferred by the spring portion feeder 27 at a constant interval, the punching machine 29 descends, punches out the mount portion from the strap, and the completed brush 15 is cut off. By repeating a series of operations like this, the final brush
Fifteen are produced.

In the above-mentioned manufacturing method, it is manufactured in the order shown in FIG. 5, is bent at the position of the broken line 12, cuts the wire at the position of the line 17, and the mounting portion is punched along the punching line shown by the line 10, A sliding brush is manufactured.

In the above-described manufacturing method, an example in which the wire is supplied onto the projection has been described. However, the projection may be turned downward, and the wire may be supplied to the lower side of the projection and welded.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, it is difficult to apply a secondary force to a welding part at the time of cutting, and it is possible to manufacture a sliding brush without adversely affecting a welding part, such as a decrease in welding strength or residual distortion. it can. In addition to these benefits,
According to the present invention, a slide brush in which a spring portion and a mount portion are integrated with each other by punching a mount portion from a suspension band can be easily manufactured. Also, since the wire is supplied from the direction perpendicular to the suspension band, there is a great advantage that the portion where the wire is welded to the projection can be easily seen and there is no wire loss.

[Brief description of the drawings]

FIG. 1 is an enlarged schematic view of a sliding brush substrate used in the present invention in which fine wires constituting a wire are welded, FIG. 2 is an enlarged view of another form of a spring portion used in the present invention, FIG. FIG. 4 is a schematic plan view and a schematic side view showing a manufacturing process of the brush assembly of the present invention, respectively, and FIG. 5 is a diagram showing a manufacturing sequence of the brush manufactured by the manufacturing method of the present invention. In the drawing, 1 is a substrate, 2 is a strap, 4 is a spring portion, 6 is a projection, 8 is a wire rod, 16 is a mount portion, 24 is a welding device,
24a is an upper electrode, 24b is a lower electrode, and 15 is a separated brush unit.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-75088 (JP, A) JP-A-62-25406 (JP, A) JP-A-54-75089 (JP, A) JP-A-56-75089 112082 (JP, A) JP-A-60-79686 (JP, A)

Claims (1)

(57) [Claims] 1. A brush in which spring portions of a spring pedestal of a brush assembly are provided at substantially equal intervals on one side of a suspension band, and at least one row of projections is provided at a tip of the spring portion in parallel with the suspension band. After transferring the assembly substrate from one direction, supplying the wire from the direction perpendicular to the transfer direction and welding the wire on the projection, punching out the mount of the spring pedestal from the suspension band to which the spring is connected. A method for manufacturing an integrated sliding brush, comprising manufacturing a sliding brush.