JPH0252402A - Base board for brush-assembly and manufacture of brush-assembly - Google Patents

Abstract

PURPOSE:To eliminate harmful influence on a weld zone and unnecessary wire member loss by providing nearly equally spaced base seats of a brush assembly via connecting parts thereof on one side of a girdle and providing at least one column of projection in parallel with the girdle on the base seat. CONSTITUTION:Nearly equally spaced base seats 4 are provided via a connecting parts 3 in a configuration that the base seat 4 extends laterally from the girdle 2. A column of projection 6 is provided at the extremity 5 of the base seat 4 nearly in parallel with the girdle 2. The projection 6 is for welding wire members 8 consisting of thin wires 7. The surface of the projection 6 may be flat, but a recess, with a depth of about 30mum for example, can be formed on the projection by which the wire members 8 consisting of six thin wires 7, with a diameter of 120mum for example, can be fixed rigidly. Thus, very homogeneous contact welding can be effected without shifting the thin wires during the welding, and stable welding strength can be obtained as to individual wire members.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can be widely used as potentiometer trimmers, encoders, etc., in combination with resistors, slip rings, etc., to transmit electric signals, and as sliding brushes for micromotors. The present invention relates to a brush assembly substrate that is used and a method for manufacturing the brush assembly.

[Conventional technology]

A method of manufacturing a brush assembly by arranging a large number of thin wires in parallel in a horizontal state and welding them to a substrate is already known, as described, for example, in Japanese Patent Publication No. 16718/1983.

In this method, the wire rod is welded to the crosspiece that connects the two straps, and then both ends of the crosspiece are cut, so secondary force is inevitably applied to the welding area, reducing the welding strength and leaving distortion. etc., there is a problem that it has an adverse effect on the welding area.

In addition, the above-mentioned method of aligning a large number of thin wires in parallel with the straps and welding them to the board is not economical since it is necessary to cut unnecessary wires after welding, and it is difficult to visually observe the welding process. There is.

[Problem to be solved by the invention]

Therefore, the present invention eliminates any negative effects on the welding area, such as reducing the welding strength or remaining distortion due to the application of secondary force to the welding area during cutting, and eliminates unnecessary wire loss. The purpose of the present invention is to provide a substrate for a brush assembly that is difficult to remove.

Another object of the present invention is to provide a manufacturing method in which a brush assembly can be efficiently manufactured using the above-mentioned substrate, and the welded portion can be easily observed.

[Means to solve the problem]

The present invention efficiently solves the above problems by forming the brush assembly substrate in a form that allows the wire to be welded to the projection by supplying the wire from a direction perpendicular to the direction in which the suspension belt is transported, unlike conventional methods. This was done based on the knowledge that it could be done.

Accordingly, the present invention is characterized in that the pedestals of the brush assembly are provided at approximately equal intervals on one side of the suspension belt via the connection part, and that the pedestal is provided with at least one row of projections parallel to the suspension strap. To provide a substrate for a brush assembly that cleans.

The present invention also provides a method for manufacturing a brush assembly, which uses the above substrate, introduces a wire from a direction perpendicular to the hanging band of the substrate, and welds the wire to the projection on the substrate.

Next, a brush assembly substrate and a method for manufacturing a brush assembly according to the present invention will be described using an example. 1st
The figure shows an enlarged schematic diagram of the brush assembly substrate 1 used in the present invention, in which pedestals 4 are jutted out to the sides of the suspension belt 2 through connecting portions 3 at approximately equal intervals. A row of projections 6 is provided at the tip end 5 of the projector in a manner substantially parallel to the suspension strap 2. This projection 6 is for welding a wire rod 8 made of a thin wire 7, as will be described later. Projection 6
The surface may be flat, but the projection (for example, 30 to 50 μm
For example, a recessed portion having a depth of about 30 μm can be formed on the surface (height of 30 μm). In other words, by doing so, it is possible to perform extremely uniform close welding without shifting the thin wire during welding, and to obtain stable welding strength for each wire.

Although FIG. 1 above shows an example in which one row of projections is provided on the pedestal, the present invention can also provide two or more rows of projections on the pedestal. In particular, it is preferable to provide two or more rows of projections because this can reduce welding defects when welding wire rods.

The projection is provided as a protruding portion on the pedestal, and can be formed by a press process. Further, the shape of the projection may be any shape as long as it protrudes above the pedestal and the wire rod can be welded, but it is preferable to use a rectangular wire rod as the wire rod and weld the wire rod to the projection with an interval of 50 to 300 μm, for example, instead of close welding. In this case, if the projection is configured as shown in Fig. 2 (an enlarged view of the pedestal part), the melted waste will accumulate in the depression 9 and will not adhere to the welding electrode, which has the advantage of increasing the life of the welding electrode. There is.

The rectangular wire rod used here has a width of 150 to 300 μm.
, a thickness of 50 to 100 μm is exemplified. Also, as a projection, the width (W) is 150 to 30.0 μm.
, Length (L) 150-300μm 1 Height 20-50μ
m is used.

In the present invention, the width is, for example, 3 to 10 mm as shown in FIG.
A pedestal 4 is connected to the side of a plate-shaped suspension belt 2 (the length is arbitrary, but generally 5 to 20 m is used) with a thickness of 100 to 500 μm via a connecting part 3. However, the connecting portion can take various shapes other than that shown in FIG. For example, it can be the same width as the pedestal,
Further, the pedestal can also be shaped in accordance with the equipment to be used.

Modifications of these pedestals and connecting portions are shown in FIGS. 3 to 5. Here, FIG. 3(a) and FIG. 5(a) are perspective views of the brush assembly substrate, and FIG. 3(a) and FIG. 4(a)
3(C), 4, etc.) and 5(C) are examples in which the wire rod is welded to the projection.
) represents a diagram in which the pedestal is separated from the connecting portion and becomes the final use shape 15.

Therefore, in the present invention, since the pedestal 4 has the shape of the brush assembly to be finally used, there is an excellent advantage that the board can be used as is by sequentially punching out the board along the cutting line 10 with a press. In other words, in the conventional method, the wire had to be separated after welding to form a single brush, and this single brush had to be attached to a spring pedestal by secondary welding in order to form a brush assembly. This saves time and effort, and since there is no room for errors in accuracy during secondary welding, both workability and quality are significantly improved.

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

Brush assemblies can be manufactured by various methods using the above-described brush assembly substrate. As a specific example, FIGS. 6 and 7 show schematic diagrams of the method for manufacturing the brush assembly of the present invention. According to this method,
3 with a width of 200 μm and a thickness of 70 μm wound on a reel 20
A wire rod 8 made of a real rectangular wire rod 7 passes through a width adjusting guide 21, and a rectangular wire rod feeding device 2 that intermittently feeds it to a constant length.
2 for welding to the projection from a direction perpendicular to the direction of transport of the suspension strap 2.

On the other hand, the continuous substrate 1 passes through the substrate guide 23 separately from the wire rod 8, and is sequentially fed out in a direction perpendicular to the alignment plane of the wire rods 8 and in conjunction with the cyclic motion in which the wire rods 8 are fed out. The interlockingly fed wire rods 8 are superimposed on the projection 6 on the substrate 1 and welded by the welding device 24. In addition, 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 part 6.

Thereafter, the groove guide 28 descends, the upper cutter 26 descends, and the plurality of rectangular wires 8 are simultaneously cut off between it and the lower cutter 25. Then, the upper cutter 26 rises,
The pedestal 4 is transferred at regular intervals by the pedestal feeding device 27, and the next pedestal 4 is installed between the upper and lower electrodes 24. after that,
The groove guide 28 is raised to the original position, and the plurality of rectangular wire rods 8 are fed to a certain length by the rectangular wire feeder 22 and guided onto the projection 6 of the pedestal 4. Also, in synchronization with the pedestal 4 being transferred at regular intervals by the pedestal feeding device 27, the connection part separation cutter 29 descends and the completed brush 15 is separated. The final brush 15 is manufactured by repeating this series of operations.

For other types of brushes, the same manufacturing method as above is applied.
After being manufactured in the order shown in the figure, cutting the wire at the line 17, bending at the broken line 12, and cutting the wire at the line 10, it can be used, for example, as a sliding brush.

In the above manufacturing method, an example was shown in which the wire was supplied onto the projection, but if the projection was directed downward,
It is also possible to weld by supplying wire to the underside of the projection.

〔Effect of the invention〕

According to the present invention, a brush assembly can be manufactured without adversely affecting the welding area, such as reducing the welding strength or leaving distortion due to secondary force being applied to the welding area during cutting. be able to. In addition to these advantages, since the substrate used in the present invention has a suspension band on only one side, the material constituting the suspension band is consumed less, making it extremely efficient and economical. Further, since the wire rod is supplied from a direction perpendicular to the suspension belt, there is a great advantage that the part where the wire rod is welded to the projection can be easily seen and there is no loss of wire rod. Another advantage is that it is easy to perform post-processes (such as smoothing wire rods).

[Brief explanation of the drawing]

FIG. 1 is an enlarged schematic diagram of a brush assembly substrate used in the present invention, in which fine wires constituting the wire are welded together; FIG. 2 is an enlarged diagram of another form of pedestal portion used in the present invention; and FIGS. 5
This figure is another schematic diagram of the brush assembly substrate used in the present invention, FIGS. 6 and 7 are a schematic plan view and a schematic side view showing the manufacturing process of the brush assembly of the present invention, respectively, and FIG. FIG. 3 is a diagram showing the manufacturing order of a brush manufactured by the manufacturing method of the present invention. In the figure, 1 is a base plate, 2 is a suspension strap, 3 is a connecting part, 4 is a pedestal, and 6
is a projection, 8 is a wire rod, 24 is a welding device, 24
Reference numeral a indicates an upper electrode, 24b indicates a lower electrode, and 15 indicates a separated brush. Figure 3 Figure 4 Engraving of the drawings (no changes in content) Figure 1 Figure 2 Figure 7, 26 2δ Figure 8 Procedural amendment (method) % formula % 1. Indication of the case 1988 Patent Application No. No. 204187 No. 3, Person making the amendment Related to the case Applicant name: Kaoriki Honten Tokyo Electronics Industry Co., Ltd. 4, Agent

Claims (2)

[Claims] (1) A brush characterized in that the pedestals of the brush assembly are provided at approximately equal intervals on one side of the suspension strap via a connecting portion, and at least one row of projections is provided on the pedestal in parallel with the suspension strap. Board for assembly. (2) A method for manufacturing a brush assembly in which a wire rod consisting of a large number of fine wires is welded to a projection on a substrate, in which a pedestal of the brush assembly as a substrate is attached to approximately one side of a suspension belt via a connecting portion. A brush assembly substrate is provided at equal intervals, and at least one row of projections is provided on the pedestal in parallel with the suspension strips, and a wire is introduced from a direction perpendicular to the suspension strips of the substrate to direct the projections onto the substrate. A method for manufacturing a brush assembly, characterized by welding wire rods.