JPS6140003A - Method of producing 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 [Technical Field] The present invention relates to a method of manufacturing a small semi-fixed variable resistor.

[Technical Background and Problems with the Prior Art] 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, conventional manufacturing processes have been adopted in which slider pieces, terminals, etc. are continuously press-molded onto metal hoop materials, the parts molded on each hoop material are assembled together, and then cut from the hoop material. It is common to do so. By using such a continuous assembly process, mass productivity is improved.

However, in the past, each member was formed into a separate hoop material,
Each hoop material is fed separately into the assembly equipment. Therefore, within one assembly device, a step of positioning a plurality of metal hoops relative to each other is required. 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 have to be supplied separately, resulting in poor workability (
- [Object of the present invention] The present invention has been made by paying attention to the above-mentioned problems of the conventional art. Make sure to □, and also 2
Is it possible to streamline the assembly process and improve mass productivity by sending the folding and assembling process while the metal plates are connected together? The purpose of the present invention is to provide a method for manufacturing a variable resistor that can maintain high quality.

[Configuration of the present invention]

In the method for manufacturing a variable resistor according to the present invention, a plurality of operating body holding parts and slider pieces integrated therewith are formed in a row on a first metal plate, and a lead plate and a lead plate are formed on a second metal plate. This and a plurality of integrated shaft bodies are formed side by side, and a resin operating body is attached to the operating body holding portion of the first metal plate.
The structure is integrally molded, and at the same time or before or after this step, the first metal plate and the second metal plate are connected with resin, - After that, the slider piece of the first metal plate is The second metal plate is folded back to the back side of the operating body, and the second metal plate shaft is inserted into the operating body with the board sandwiched between the two metal plates.By connecting the two metal plates with resin, The members formed on each metal plate are accurately positioned with respect to each other so that they can be assembled with high precision.

[Example of the present invention]

'Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

Figure 1 (A) is a plan view 1 of the first metal plate 1, and Figure 1 (B) is a plan view of the first metal plate 1.
) is its side view.

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

A plurality of operating body holding portions l'l are formed on the first metal plate 1. As shown in FIG. - The left and right sides of this operating body holding portion 11Jt are supported by the metal plate l by connection arms 14. A shaft hole lla is bored in the center of this operating body holding portion ll, and four folding pieces 'l' lb are provided around the periphery.

' Also, a slider piece 12 is integrated with each operating body holding portion ll 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 slider piece 12. Furthermore, a contact 12c separated into a semicircular arc shape is integrally formed on the outside of the undulating portion 12a, and this contact 12c is formed to protrude in the same direction as the undulating portion 12a.

The second (Todoroki) figure is a plan view showing the second metal plate 2, and the second ('
B) The figure is a 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. Both the feed holes 2a and the connection holes 2b are formed at the same pitch, that is, the same pitch as the feed holes 1a and the connection holes 1b of the first metal plate l. Also,
A plurality of rectangular notches 2''C are formed in the second metal plate 2, and a lead plate 21 is disposed in each of the notches 2''C. It is connected to the metal plate 2 via a connecting arm 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. Also,
A shaft body 23 is provided at the center of the lead plate 21 .

This shaft body 23 is drawn when forming the lead plate 21, and is hollow inside.

3(A) and 3(B) show the process of connecting two metal plates 1 and 2. FIG.

In this first step, the 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 is formed in the same manner as the connecting body 3 made of resin. 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 has connecting holes 1b and 2 bored in each metal plate l and 2.
After passing through the inside of the metal plates 1 and 2, it is placed on the front and back surfaces of the metal plates 1 and 2 and molded. The two metal plates 1 and 2 are connected by this connecting body 3. Furthermore, due to this connection, the relative positions of the operating body holding portion ll 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 holding portion 11 is provided with four bent pieces 11b (see Fig. 1(A)),
The operating body 4 is fixed by this bent piece 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, the slider piece 12 is bent and folded directly under the operating body 4 as shown in FIG. 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 12 of the slider piece 12.
b and into the shaft hole 11a of the operating body holder 11.

Thereafter, the tip of the shaft body 23 is caulked to rotatably attach the operating body 4 and the slider piece 12. At this time, the substrate 5
A terminal (not shown) is provided on the 6-board 5, on which the contact 12c comes into elastic contact with the resistor 6, which is formed in a semicircular arc shape on the surface of the resistor 6. connected to the body 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 l and 2 are connected by the connecting body 3, and the relative positions of the lead plate 21 and the operating body 4 are precisely determined, so the metal plate 2 (as well as the metal plate 1) is aligned with a predetermined reference line. By simply bending the shaft body 23 through the hole 12b and the shaft hole 11a, the shaft body 23 is reliably inserted into the hole 12b and the shaft hole 11a, and an accurate combination is performed.

After the components are assembled in the state shown in FIG. 5, the connecting arm 14 of the first metal plate 1 is cut, and the connecting arm 22 of the second metal plate 2 is cut, thereby completing 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 the dry/< into the groove 4b and rotate the operating body 4. As a result, the contact piece 12c slides on the resistor 6 together with the operating body 4, and connects the terminal (not shown) connected to the resistor 6 and the lead plate 21 electrically connected to the slider piece 12. The resistance value is set between

[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 plate and the shaft body are combined, each member formed on the two metal plates connected by the resin connecting body is accurately positioned, and there is no error in the combination. It will be done without any problems. 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) With the two metal plates connected, the following bending,
In addition, since assembly can be carried out in a process, the supply process becomes simpler and workability is improved compared to a method in which a plurality of metal plates are supplied separately.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention.
The figure is a plan view of the first metal plate, the first (B) figure is a side view thereof, the second (A) is a plane view of the second metal plate, and the second (B) figure is a plan view of the first metal plate.
The figure shows the right side view, and Figure 3 (A) shows the first metal plate and the second metal plate.
3(B) is a sectional view thereof, FIG. 4 is a sectional view showing the process after connection, and 5th
The figure is a sectional view showing the variable resistor after completion. l...first metal plate, 2...second metal plate, 3...
- Connecting body, 4... Operating body, ll... Operating body holding part,
12...Slider piece, 12c...Contact piece, 21...
Lead plate, 23...shaft body.

Claims (1)

[Claims] A plurality of operating body holding portions and slider pieces integrated therewith are formed side by side on a first metal plate, and a second metal plate includes:
A plurality of lead plates and shaft bodies integrated therewith are formed side by side, and a resin operating body is integrally molded on the operating body holding portion of the first metal plate, and at the same time as this step or before or after this step. , the first metal plate and the second metal plate are connected by resin, and then the slider piece of the first metal plate is folded back to the back of the operating body, and the shaft body of the second metal plate is connected to the substrate. A method for manufacturing a variable resistor, comprising a step of sandwiching the resistor and inserting it into the operating body.