JPH03214708A - Manufacturing method of variable resistor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing a constant variable resistor.

Prior Art The prior art will be explained with reference to FIG. 4, an exploded perspective view of a chip type semi-fixed variable resistor. According to the figure, 1 is a middle terminal and has an eyelet portion 1a near the center. 2 is a resistor, which has a resistance element L/portion 2a and an electrode portion 2b;
Furthermore, it has a center hole 2c into which the eyelet portion 1a of the middle terminal 1 is inserted. Reference numeral 3 designates a brush, which includes a contact portion 3a that slides into contact with the resistance element portion 2a of the resistor 2, a notch portion 3b that engages with the engagement portion 4b of the knob 4, and the middle terminal 1.
It has a center hole 3c into which the eyelet portion 1a is inserted. The knob 4 is inserted with a groove 4a for driver adjustment, an engaging part 4b that engages with the notch 3b of the brush 3 so that the brush and knob rotate together, and an eyelet part of the inner terminal 1. A center hole 4c is provided.

The above parts are assembled by inserting the eyelet 1a of the inner terminal 1 into the center hole 2a of the resistor 2, the center hole 3c of the brush 3, and the center hole 4c of the knob 4 in this order, and caulking the eyelet 1a protruding from the knob 4. It is something that becomes.

Problems to be Solved by the Invention However, in the above conventional chip type semi-fixed variable resistor, when the knob 4 is assembled into a product, the eyelet portion 1a of the inner terminal 1, the center hole 4c of the knob 4, and the cutout portion of the brush 3 are removed. 3b and the locking portion 4b of the knob 4, and in particular, the combination of the cutout portion 3b of the brush 3 and the locking portion 4b of the knob 4 is necessary in addition to the misalignment of the knob 4 and the brush 3 in the X and Y directions. Therefore, it was difficult to position the knob 4 and the brush 3 without taking into account the deviation in the rotational direction, which was an obstacle to increasing the speed of the automatic assembly machine.

Means for Solving the Problems In order to solve the above problems, the present invention provides a method for positioning a hoop-shaped brush having successive pilot holes and a knob having successive pilot holes using the respective pilot holes. The variable resistor is then manufactured by cutting the knob into individual pieces and at the same time forming a hoop-shaped brush with a knob in which the protrusion provided on the knob is positioned and locked in a hole provided in the brush.

Therefore, according to the present invention, by configuring the brush and the knob in a hoop shape, the accuracy of positioning the protrusion provided on the knob and the hole provided on the brush is increased by the pilot bin of each of the hoops, and the assembly process is improved. This makes it possible to increase the speed.

Embodiment An embodiment of the present invention will be explained with reference to FIGS. 1(a) to 3.

FIG. 1(a) is a perspective view of a hoop-shaped knob which is a main part of a chip type semi-fixed variable resistor, FIG. 1(b) is a perspective view of the same hoop-shaped brush, and FIG. C) is a perspective view illustrating a state in which the hoop-shaped knob and hoop-shaped brush are integrated, and FIG. 2(a). (b) , (C)
are side views corresponding to FIGS. 1(a), (b), and (C), respectively, and FIG. 3 is a side sectional view of the chip type semi-fixed variable resistor. According to the figure, 5 is a hoop knob, which includes a driver groove 5a, a center hole 5b, a pilot hole 5c. It has a protrusion 5d. 6 is a hoop-shaped brush, which includes a contact portion 6a, a center hole 6b, and a pilot hole 6.
c and a hole 6d. These parts are positioned by respective pilot holes 5c and 6C, and at the same time as the knob 5 is cut, the projection 5d of the knob 5 is inserted into the hole 6 of the brush 6.
The knob and the brush are integrated by caulking the protrusion 5d which is inserted through the brush hoop 5d and protrudes from the brush 6, thereby constructing the knob-equipped brush hoop 7 shown in FIGS. 1(C) and 2(C). Furthermore, as shown in FIG. 3, the eyelet portion 1a of the inner terminal 1 is inserted into the center holes 5b, 6b of the brush hoop 7 with the knob and the center hole 2a of the resistor 2, and the protruding portion 1b protruding from the knob 5 is squeezed. This completes the chip type semi-fixed variable resistor.

Effects of the Invention In the present invention, as is clear from the above embodiments, by forming a knob and a brush into a hoop and integrating them in that state, the accuracy of the combination is increased and assembly can be speeded up.

[Brief explanation of drawings]

5 is a perspective view illustrating a state in which the knob and the hoop-shaped brush are integrated, and FIGS. 2(a), (b), and (C)
are side views corresponding to FIGS. 1(a), (b), and (C), respectively, FIG. 3 is a side sectional view of a chip type semi-fixed variable resistor, and FIG. 4 is a side view of a conventional chip type semi-fixed variable resistor. FIG. 2 is an exploded perspective view of a semi-fixed variable resistor. 1... Middle terminal, 2... Resistor, 5...
...Hoop-shaped knob, 5 c + 6 c...
...Pilot hole, 5d...Hoop-shaped knob protrusion, 6...Hoop-shaped brush.

Claims (1)

[Claims] At least a hoop-shaped brush having consecutive pilot holes and a hoop-shaped knob having consecutive pilot holes are positioned by the respective pilot holes,
The hoop-shaped knob is cut into individual pieces, and the protrusion provided on the knob is positioned and locked in the hole provided in the brush to form a hoop-shaped brush with a knob, and a resistor is attached to the hoop-shaped brush. A method for manufacturing a variable resistor in which a middle terminal is attached through a wire.