JPH0158845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method of manufacturing a small semi-fixed variable resistor.

[Technical background and problems with conventional technology]

Many small semi-fixed variable resistors are used in recent electronic devices. This type of variable resistor is required to improve mass productivity and reduce costs.

Therefore, in the past, slider pieces, terminals, etc. were continuously press-molded onto metal hoop materials, and the members molded on each hoop material were assembled together, and then,
A manufacturing process that involves cutting from hoop material is generally adopted. By using such a continuous assembly process, mass productivity is improved.

However, conventionally, each member is formed into a separate hoop material, and each hoop material is separately supplied into an assembly apparatus. Therefore, a step of positioning the plurality of metal hoops relative to each other is required within the assembly apparatus. Further, if the hoop materials are not properly positioned with respect to each other due to misalignment in the supply position of the hoop materials, the relative positions of the slider pieces and the shaft body will be misaligned, making accurate assembly impossible. moreover,
When each hoop material is interrupted, a new hoop material is supplied to the assembly process, but at this time, the hoop materials must be supplied separately, resulting in poor work efficiency.

[Object of the present invention]

The present invention has been made by paying attention to the above-mentioned conventional problems, and enables the slider pieces formed by punching out a plurality of metal plates and the shaft body to be accurately positioned with respect to each other. Provides a method for manufacturing a variable resistor that streamlines the assembly process, improves mass production, and maintains high quality by sending the metal plates connected together to the bending and assembly process. It is intended to.

[Configuration of the present invention]

A method for manufacturing a variable resistor according to the present invention includes forming a plurality of operating body holding parts and a plurality of slider pieces integral therewith on a first metal plate;
On the metal plate, a plurality of lead plates and shaft bodies integral with the lead plate are formed side by side, and a resin operation body is integrally molded on the operation body holding portion of the first metal plate, and at the same time as this step, or Before and after this process, the first metal plate and the second metal plate are connected with resin, and then the slider piece of the first metal plate is folded back to the back of the operating body, and the second metal plate is It is made up of a step of inserting the shaft of a metal plate into the operating body with a substrate in between, and each metal plate is formed by connecting two metal plates with resin. The members are accurately positioned relative to each other and assembled with high precision.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a plan view of the first metal plate 1, and FIG. 1B is a side view thereof.

The first metal plate 1 is a hoop material, and feed holes 1a are bored at a predetermined pitch in one edge thereof. Further, a square connecting hole 1b is bored in the other edge. This connecting hole 1b is bored at the same pitch as the feed hole 1a.

This first metal plate 1 has a plurality of operating body holding parts 1.
1 is formed. The operating body holding portion 11 is supported on the metal plate 1 by connecting arms 14 on both left and right sides. A shaft hole 1 is provided in the center of this operating body holding portion 11.
1a is bored, and four bent pieces 11b are provided around the periphery.

Furthermore, a slider piece 12 is integrated into each operating body holding portion 11 via a connecting piece 13 . This slider piece 12 is approximately circular. An undulating portion 12a is formed in the center of the slider piece 12 and is convex toward the front in the plane of the drawing, and a hole 12b is bored in the center of the undulating portion 12a. Further, contact pieces 12c separated into semicircular arc shapes are integrally formed on the outside of the undulating portion 12a. This contactor 12c is formed to protrude in the same direction as the undulating portion 12a.

FIG. 2A is a plan view showing the second metal plate 2;
Figure B is its side view.

This second metal plate 2 is made of a hoop material, and has a feed hole 2a in one edge thereof and a square connecting hole 2b in the other edge. This feed hole 2a
and the connecting hole 2b are both formed at the same pitch, that is, the same pitch as the feed hole 1a and the connecting hole 1b of the first metal plate 1. Further, a plurality of angular notches 2c are formed in the second metal plate 2, and a lead plate 21 is disposed within each of the notches 2c. One end of this lead plate 21 is connected to the metal plate 2 via a pair of connecting arms 22.
The center portion of the lead plate 21 protrudes forward in the plane of the drawing, and bent pieces 21a are formed at both ends. Further, a shaft body 23 is provided at the center of the lead plate 21.
is provided. This shaft body 23 is the lead plate 21
It was drawn during the molding process, and the inside is hollow.

Figures 3A and 3B show the process of connecting two metal plates 1 and 2.

In this step, two metal plates 1 and 2 are placed side by side and outsert molded with resin. Through this outsert molding, the operating body 4 made of resin, like the connecting body 3 made of resin, is formed. The connecting body 3 and the operating body 4 may be molded at the same time, or may be molded in separate steps before and after.

The connecting body 3 is molded by passing through the connecting holes 1b and 2b formed in each of the metal plates 1 and 2, and being mounted on the front and back surfaces of the metal plates 1 and 2. The two metal plates 1 and 2 are connected by this connecting body 3. Moreover, by this connection, the relative positions of the operating body holding portion 11 and the slider piece 12 of one metal plate 1 and the lead plate 21 of the other metal plate 2 are determined with high precision.

The operating body 4 is formed by adhering resin to the surface of the operating body holding portion 11 (front side in the drawing). Since the operating body holder 11 is provided with four bent pieces 11b (see FIG. 1A), the operating body 4 is fixed by these bent pieces 11b. Further, a hole 4a is formed in the center of the operating body 4, and a groove 4b for inserting a driver is formed on the surface of the operating body 4.

In the next step, as shown in Fig. 4, the slider piece 1
2 and fold it directly under the operating body 4. Also, before and after this, the lead plate 21 is bent in the direction shown by the dashed line in FIG.

Then, as shown in FIG. 5, the lead plate 21 and the operating body 4 are assembled with the board 5 in between. That is, the board 5 is inserted into the shaft body 23, and the shaft body 23
is inserted into the hole 12b of the slider piece 12 and the shaft hole 11a of the operating body holding portion 11. After that, the shaft body 23
Caulk the tip of the operating body 4 and slider piece 1.
2 is attached rotatably. At this time, the contactor 12c comes into contact with the resistor 6 formed in a semicircular arc shape on the surface of the substrate 5 with elastic force. Board 5
is provided with a terminal (not shown), and this terminal is connected to the resistor 6.

Note that when assembling the lead plate 21 and the operating body 4, the metal plates 2 are sequentially bent, and in some cases, the metal plate 1 is also bent. The two metal plates 1 and 2 are connected by the connecting body 3, and the relative positions of the lead plate 21 and the operating body 4 are accurately determined, so the metal plate 2 (as well as the metal plate 1) is By simply bending along the reference line, the shaft body 23 is reliably inserted into the hole 12b and the shaft hole 11a, and accurate assembly is performed.

After being combined into the state shown in Fig. 5, the first
The connecting arm 14 of the second metal plate 1 is cut off, and the connecting arm 22 of the second metal plate 2 is cut off to complete the variable resistor.

Next, the operation of the variable resistor completed in the state shown in FIG. 5 will be explained.

To operate the variable resistor, insert a driver into the groove 4b and rotate the operating body 4. As a result, the operating body 4
At the same time, the contact piece 12c slides on the resistor 6, and a resistance value is generated between the terminal (not shown) connected to the resistor 6 and the lead plate 21 that is electrically connected to the slider piece 12. is set.

[Effects of the present invention]

As described above, according to the present invention, the effects listed below can be achieved.

(1) The first metal plate and the second metal plate are connected by a resin connecting body, and then the operating body holding part and the slider piece formed on the first metal plate are connected to the second metal plate. Since the lead plate formed on the two metal plates and the shaft body are combined, each member formed on the two metal plates connected by the resin connecting body can be accurately positioned. , the combination can be performed without error. Therefore, highly accurate variable resistors can be mass-produced at low cost.

(2) The connecting body connecting the first metal plate and the second metal plate is molded from resin at the same time as, or before or after, the process of molding the operating body. Therefore, no new process is required, and the connecting body can be easily molded by outsert molding similar to the operation body. Furthermore, since the two metal plates can be connected by outsert molding using resin, the two metal plates can be reliably connected with high precision.

(3) Since the next bending and assembling process can be carried out with the two metal plates connected, the feeding process is simpler and easier than the method of feeding multiple metal plates separately. Sex also improves.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1A is a plan view of the first metal plate, FIG. 1B is a side view thereof, and FIG. 2A is a plan view of the second metal plate.
Figure B is a right side view thereof, Figure 3A is a plan view showing the state in which the first metal plate and the second metal plate are connected, and Figure 3
FIG. 4 is a sectional view showing the process after connection, and FIG. 5 is a sectional view showing the variable resistor after completion. 1...First metal plate, 2...Second metal plate, 3
... Connecting body, 4 ... Operation body, 11 ... Operation body holding part, 12 ... Slider piece, 12c ... Contact element, 21
... Lead plate, 23 ... Shaft body.

Claims (1)

[Claims] 1. A plurality of operating body holding parts and slider pieces integrated therewith are formed side by side on a first metal plate, and a lead plate and a slider piece integrated therewith are formed on a second metal plate. A resin operating body is integrally molded on the operating body holding portion of the first metal plate, and at the same time or before or after this step, the first metal plate and The second metal plate is connected with resin, and then the slider piece of the first metal plate is folded back to the back side of the operating body, and the shaft body of the second metal plate is connected to the operating body with the substrate in between. A method for manufacturing a variable resistor, which includes a step of inserting the resistor into the resistor.