JP2680866B2 - Micromotor brush welding equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement in a welding device for a brush for a micromotor.

(Prior Art) Conventionally, a brush for a micromotor is formed by pressing a composite clad material made of a copper-based alloy material having a spring property, which is inlay-bonded with a noble metal material, into a comb-teeth shape by pressing. The brush is welded to a base material such as brass and then used by incorporating it into a mold.

(Problems to be solved by the invention) By the way, the welding of the comb-shaped brush to the base material such as brass is automated in consideration of productivity, quality stabilization, etc. There was a problem.

That is, as shown in FIG. 7, a brush 3 formed by pressing a composite clad material into a comb shape on a base material 2 placed on the lower electrode 1 in advance is held by a holding and transferring jig 4. Then, the brush 3 is overlapped with the base material 2 as shown in FIG. 1, and pressure welding is conducted between the upper electrode 5 and the lower electrode 1 for resistance welding. However, if the brush 3 is warped or bent, It is caught when it is conveyed onto the base material 2 on the lower electrode 1. For this reason, a gap G is provided in advance between the brush holding position and the base material 2 so as not to be caught, and the base material 2 is conveyed. However, when welding is performed thereafter, the gap G
Therefore, as shown in FIG. 9, the brush 3, particularly the brush 3 having a large plate thickness, cannot absorb the inclination caused by the gap G and cannot be deformed accurately or cannot be welded accurately as a result of which the welding strength becomes unstable, as shown in FIG. There was a problem when using the motor.

Therefore, the present invention is intended to provide a welding device for a brush for a micromotor, which can perform accurate and stable welding without deforming the brush 3 even if the brush 3 is warped or bent.

(Means for Solving the Problem) A welding device for a brush for a micromotor according to the present invention for solving the above-mentioned problems is provided for a brush holding and transferring operation in which a brush is carried in laterally between an upper electrode, a lower electrode and both upper and lower electrodes. In a micromotor brush welding device including a jig, the brush holding and transferring jig is vertically movable and is supported on an elastic body, and the upper electrode has an outer peripheral surface between the upper and lower electrodes. Further, a pressing jig for elastically pressing the brush holding and transferring jig, in which the brush is stopped to be carried in, is fixed by the lowering of the upper electrode.

(Operation) According to the micromotor brush welding device of the present invention configured as described above, the brush is clamped on the brush holding and transferring jig, and the height and the vertical position of the base material previously placed on the lower electrode are adjusted. Raise the brush holding and transferring jig so that a certain gap is created between the electrodes and the height of the brush that is carried in from the side, and in this state, move the brush holding and transferring jig horizontally to move it vertically. By loading the brush between the electrodes from the side and positioning it above the base material that has been transferred and placed on the lower electrode, during welding by lowering the upper electrode, the brush is held by the pressing jig that descends with the upper electrode. The transfer jig is pressed against the elastic body and descends, the gap between the brush and the base material disappears, and the brush is parallel to the height of the base material. As a result, the brush may deform. In spite of this, it is possible to obtain a brush for a micromotor that is welded to a base material with high accuracy and stability, has high welding strength, and is of good quality.

(Embodiment) An embodiment of a micromotor brush welding device of the present invention will be described with reference to FIG. 1. Reference numeral 1 is a lower electrode, 5 is an upper electrode, and 4'is a jig for transferring and holding a brush. The transfer jig 4'is an elastic body in which the jig main body 4'a is vertically movably inserted in the guide cylinder 4'b and is arranged at the bottom of the guide cylinder 4'b. In this example, on the spring 4'c. Is supported by. At the position of the outer peripheral surface of the upper electrode 5 on the brush holding and transferring jig 4 ′ side, the jig main body of the brush holding and transferring jig 4 ′ in which the brush 3 is stopped between the upper and lower electrodes 5 and 1 is stopped. A pressing jig 6 for elastically pressing 4'a by lowering the upper electrode 5 is fixed. The pressing jig 6 includes an arm 6a horizontally protruding from the outer peripheral surface of the upper electrode 5 and an arm 6a.
It comprises a cylinder 6b fixed to the tip of 6a, a push pin 6c arranged in the cylinder 6b, and a spring 6d arranged between the push pin 6c and the cylinder 6b.

An example of manufacturing a micromotor brush by the micromotor brush welding device thus configured will be described. As shown in Fig. 2, thickness 0.02mm, width 2mm, length 1.3
mm Ag-Pd 30 wt% plate 10, thickness 0.15 mm, width 1.3 m
As shown in FIG. 3, the composite clad material 12 formed by inlaying the phosphor bronze plate 11 of m and 12 mm in length at right angles to the tip of the plate 11 was press-worked to have a width of 0.3 mm and a length of 6 mm.
Comb-shaped brush 3 having three wire rods 3a at 0.2 mm intervals
The tip of the brush 3 is clamped to the jig body 4'a of the brush holding and transferring jig 4'as shown in FIG. 6 mm thick
The jig body 4'a was raised so that a vertical gap G was provided between the upper surface of the base material 2 of 0.4 mm brass and the holding portion of the brush 3. Next, as shown in FIG. 5, the brush holding and transferring jig 4'is horizontally moved to move the upper and lower electrodes 5, 1
The brush 3 was carried in from the side between them, and was positioned above the base material 2 transferred and placed on the lower electrode 1. Next, when the upper electrode 5 is lowered as shown in FIG. 6, the push pin 6c of the pressing jig 6 is lowered together with the upper electrode 5, and the jig body 4'a of the brush holding and transferring jig 4'is moved to the spring 4 '. It is pressed against c and descends, the gap G between the holding part of the brush 3 and the upper surface of the base material 2 disappears, and the upper and lower electrodes 5 and 1 are applied while the brush 3 is parallel to the height of the base material 2. It was welded to the base material 2 by applying a piezoelectric force. Therefore, the brush 3 was accurately and stably welded to the base material 2 without being deformed, and a micromotor brush having high welding strength and good quality was obtained.

(Effects of the Invention) As can be seen from the above description, according to the micromotor brush welding device of the present invention, even if the comb-shaped brush is warped or bent, the upper surface of the base material and the brush holding portion are preliminarily formed. Since a gap can be created between the upper and lower electrodes, it does not get caught, and when the upper electrode is lowered, the gap between the brush holder and the top surface of the base material disappears, and Since it is welded to the base material by applying pressure to both upper and lower electrodes in parallel with the height of the material, the brush is accurately and stably welded to the base material without deformation.
There is an excellent effect that a brush for a micromotor having high welding strength and good quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a welding device for a micromotor brush of the present invention, FIGS. 2 to 6 are diagrams showing a manufacturing process of the micromotor brush, and FIGS. 7 to 9 are conventional ones. It is a figure which shows the manufacturing process of a micromotor brush when the welding device of the brush for micromotors is used.

Claims (1)

(57) [Claims] 1. A micromotor brush welding apparatus comprising an upper electrode, a lower electrode, and a brush holding and transferring jig for laterally loading a brush between the upper and lower electrodes. Is vertically movable and is supported on an elastic body, and a brush holding and transporting jig in which a brush is not carried in between the upper and lower electrodes is elastically pressed against the outer peripheral surface of the upper electrode by lowering the upper electrode. A welding device for a brush for a micromotor, wherein a pressing jig is fixedly installed.