JPH0116002B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a sliding variable resistor used in various electronic devices such as radio receivers and television receivers.

Conventional structure and its problems Conventionally, as shown in Fig. 1, in a slide type variable resistor, a resistor 2 is first placed in a mounting case 1, and both ends of the resistor 2 and the corresponding mounting case are mounted. Insert the terminal 3 into the terminal mounting hole (not shown) provided in the mounting case 1 and caulk it, and insert both ends of the contact plate 4 into the contact plate small hole (not shown) of the mounting case 1. The area around the outside of the contact plate small hole of this contact plate 4
The resistor 2 and contact plate 4 were fixed to the mounting case 1 by twisting 90 degrees. Then, a slider 6 is mounted on the mounting case 1, and a brush 5 is attached to the lower surface of the brush 5 whose tip portion slides on the resistor 2 and the contact plate 4 to bridge between them, and a lever portion of the slider 6 is mounted. Attach the slide spring 7 and friction plate 8 to 6a,
After that, a sliding plate 10 is assembled inside the upper surface of the cover 9 having a long hole 9a on the upper surface, and the bottom opening of the cover 9 is attached to the mounting case 1 and slid so that the lever part 6a protrudes from the long hole 9a. I had completed assembling a variable resistor.

However, with the conventional slide type variable resistor assembly method described above, when promoting automation to save labor in recent years, it is difficult to transfer and position the mounting case, resistor, etc., and it is difficult to speed up automation. It had the disadvantage of having limitations in terms of

OBJECTS OF THE INVENTION The present invention has been made to eliminate the above-mentioned conventional drawbacks, and provides a method for manufacturing a sliding variable resistor that can be easily automated.

Structure of the Invention In order to achieve this object, the present invention includes the following steps:
It has a resistor, an electromagnetic part connected to both ends of the resistance path, a conductive path arranged in parallel with the resistance path, and a small hole for attaching a terminal provided in each of the conductive path and the electrode part. A hoop-shaped terminal having a terminal corresponding to the small hole for terminal attachment is divided in the longitudinal direction of the insulating substrate, and the terminal is aligned and fixed to the small hole for terminal attachment, thereby producing an insulating substrate with a hoop-shaped terminal. A step of: installing the hoop-shaped insulating substrate with terminals in a mold, so that the terminal ends protrude and at least the portions of the resistance path, electrode portion, and conductive path on which the brush slides are removed; A mounting case is molded to cover the hoop-shaped insulating board with terminals,
A step of forming a mounting case with terminals and an insulating board; placing a slider with a brush on the mounting case, and attaching the bottom opening of the cover having a long hole on the top surface to the mounting case so as to store the slider therein; It consists of a process. According to this configuration, since it can be transported to the molding process in a hoop shape, positioning and transport are easy, the speed of positioning and transport can be increased, and an efficient assembly method that can be easily automated can be achieved. It is.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.
This will be explained with reference to the figures.

First, in the figure, reference numeral 11 indicates a resistance path 13 having electrode portions 12 at both ends, a conductive path 14 arranged in parallel with the resistance path 13, and a conductive path 14 with the electrode portions 12 at both ends.
Small holes 15, 16 for terminal attachment provided at one end of 4
and 17, and this insulating substrate 11 has small holes 15, 17 for attaching the terminals on one end side.
Similarly, a terminal mounting hole 18 is provided on the other end side adjacent to the terminal mounting hole 16. Here, the small holes 15 to 18 for attaching the terminals are connected to the insulating substrate 1.
Of course, it is provided to penetrate through 1. 19 is provided with guide sides 21 having guide holes 20 provided at appropriate intervals on both sides in the longitudinal direction, and connecting pieces 22 connecting the guide sides 21 on both sides in correspondence with the guide holes 20. These are hoop-shaped terminals provided at regular intervals. Terminals 23 to 26 having holes corresponding to the terminal mounting holes 15 to 18 are integrally provided on both sides of each connecting piece 22 of this hoop-shaped terminal 19, and between each connecting piece 22, terminals 23 to 26 are integrally provided. Terminals 23 to 26 are the third
As shown in the right part A of the figure, they are arranged in series. In addition, the terminals 23 on both sides of the contact piece 22 are
26 are provided at different levels from each other, and each terminal 2 on the same side as viewed from each connecting piece 22
3 to 26 are provided on the same straight line in the longitudinal direction. Further, each of the connecting pieces 22 is provided with a plurality of cutting holes 27 to facilitate cutting in a subsequent process.

Then, the hoop-shaped terminal 19 is cut in the longitudinal direction at the center of the connecting piece 22, as shown in the central part B of FIG. Usually several contact pieces 2
2 are sequentially cut together. The hoop-shaped terminal 19 cut in the longitudinal direction is the left part C in FIG.
As shown in FIG. 2, the distance between the guide sides 21 of the insulating substrate 11 is expanded along the length of the insulating substrate 11 in the longitudinal direction, and in this expanded state, the terminals 23 between adjacent contact pieces 22
The insulating substrate 11 is placed so that the terminal mounting holes 15 to 18 are aligned with the terminal mounting holes 15 to 26, and the insulating substrate 11 is fastened with pins 28 using the respective terminal mounting holes 15 to 18 and the holes for the terminals 23 to 26. Hoop terminal 19
is fixed to. This hoop is conveyed to the molding process as it is.

Next, in the molding process, the hoop-shaped terminal 19 (more precisely, the terminal 19 is cut and the two guide sides 21
an insulating substrate 11 with a hoop-shaped
The insulating substrate 11 is molded so as to be covered with resin, except for at least the portions of the resistance path 13, the electrode section 12, and the conductive path 14 where a brush (to be described later) comes into sliding contact, as shown in FIG. Mounting case 2 with hoop-shaped terminal 19 and insulating board 11
9 is made. At this time, the terminals 23 to 26 are buried in the mounting case 29 with their ends protruding outward. Moreover, this molding step is also usually performed for several pieces at once. Next, the mounting case 29 with the hoop-shaped terminal 19 and the insulating board 11 is cut at the hoop-shaped portion and transported to the next assembly process, where a slider, cover, etc. are assembled to form a finished product, or The hoop-shaped part is transported to the next process, where a slider, cover, etc. are assembled, and then the hoop-shaped part is cut to form a finished product. Here, the hoop-shaped portion is cut so that the terminals 23 to 26 in the diagonally shaded portion remain as shown in FIG.

The assembly of each component into the mounting case 29 will be briefly explained with reference to FIG. 5. First, brush 30
The slider 31 with the
the lever part 31 of the slider 31
Insert the slide spring 32 and friction plate 33 into a,
Thereafter, a sliding plate 35 is assembled inside the upper surface of the cover 34 having a long hole 34a on the upper surface, and the lever portion 31
the cover 3 so that a protrudes from the elongated hole 34a.
Assembly is performed by attaching the bottom opening of No. 4 to the mounting case 29. Figure 6 shows the finished product.

Furthermore, it goes without saying that the present invention is not limited to the two-unit form shown in the embodiments.

Effects of the Invention The method for manufacturing a sliding variable resistor according to the present invention is configured as described above, and has the following effects. First, since it can be transported to the molding process in a hoop shape, transport and positioning are easy, the speed of transport and positioning can be increased, and efficient assembly can be performed with ease of automation. In addition, since the terminals are buried in the mounting case except for the ends, flux from soldering during installation to the set does not adhere to the resistance path through the terminals, which prevents the generation of sliding noise. Can be done. We also created a process to cut the hoop-shaped terminals in the longitudinal direction corresponding to the groups of terminal mounting holes on the adjacent insulating substrates, making it possible to handle insulating substrates with different lengths (sliding distances). This makes it possible to use only one type of hoop-shaped terminal, which helps standardize parts and reduce material loss. Further, when the terminals are provided in different levels, material loss of the hoop-shaped terminal can be reduced, and practical effects can be further improved.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view for explaining the conventional method of assembling a slide type variable resistor, Fig. 2 is a perspective view of an insulating substrate for explaining the manufacturing method of the present invention, and Fig. 3 is a hoop-shaped FIG. 4 is an enlarged top view showing the state of the hoop after molding; FIG. 5 is a perspective view showing how the insulating board is attached to the terminal; FIG. The exploded perspective view and FIG. 6 are cross-sectional views of a sliding variable resistor obtained by the manufacturing method of the present invention. 11... Insulating substrate, 12... Electrode section, 13...
Resistance path, 14... Conductive path, 15-18... Small hole for terminal attachment, 19... Hoop-shaped terminal, 23-26...
...Terminal, 29...Mounting case, 30...Brush, 3
1...Slider, 34...Cover, 34a...
Long hole.

Claims (1)

[Claims] 1 a resistance path, electrode parts connected to both ends of this resistance path, and a conductive path arranged in parallel with the resistance path;
Terminals are provided corresponding to the terminal mounting holes in at least each adjacent terminal mounting hole group of the insulating substrate having terminal mounting holes provided in each of the conductive path and the electrode section. a step of dividing a hoop-shaped terminal having a hoop-shaped terminal in its longitudinal direction; a step of aligning and fixing the hoop-shaped terminal with the small terminal mounting hole to form an insulating substrate with a hoop-shaped terminal;
The hoop-shaped insulating substrate with terminals is installed in a mold, and the terminal ends protrude and the resistance path
forming a mounting case so as to cover the hoop-shaped insulating board with terminals except for at least the portion of the electrode section and the conductive path where the brush slides, thereby forming a mounting case with terminals and insulating board; A method of manufacturing a slide type variable resistor comprising the steps of placing the variable resistor on the mounting case and attaching a bottom opening of a cover having a long hole on the top surface to the mounting case so as to accommodate the slider therein.