JPH0116003B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method of manufacturing a sliding type variable resistor, and particularly to a method of forming terminals and a substrate block on an insulating substrate.

[Background of the invention]

When manufacturing a sliding type variable resistor, a terminal and a board block are formed on an insulating substrate with a resistance layer on the surface, and a slider holder and a frame body to which a slider is fixed are attached to this, and the product is manufactured. complete.

Conventionally, the process of forming terminals and board blocks on an insulating board is difficult to automate because it requires human labor, for example, when forming terminals by cutting uncut terminals and then molding board blocks made of synthetic resin material. However, there was a problem that the manufacturing process became complicated.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a simple method of manufacturing a sliding type variable resistor in which the manufacturing process of forming terminals and board blocks on an insulating substrate can be automated.

[Summary of the invention]

In order to achieve this object, the present invention involves continuously forming a plurality of eyelets on a strip-shaped metal plate, and then punching the metal plate so that one end has the eyelet and the other end is connected. A plurality of uncut terminals are formed, and these uncut terminals are folded back in a direction in which the distance between adjacent pairs is narrowed on the connected end side, and then the eyelet is inserted into a through hole of an insulating substrate provided with a resistive layer. and caulking, then filling the insulating substrate including the caulked portion with a synthetic resin material to form a substrate block, and then cutting the uncut terminals from the metal plate outside the substrate block. Features.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view of a completed product in which predetermined terminals and board blocks have been formed on an insulating substrate. 1 is an insulating substrate, 2 is a resistance layer provided on this insulating substrate 1, and 3 is also an insulating substrate. A current collecting layer is provided on a substrate 1, 4 is a substrate block made of a synthetic resin material, and 5 is a metal terminal.

In the process of manufacturing such a finished product, first, two relatively thin hoop-shaped metal plates are placed in parallel at a predetermined interval, and each metal plate 6 is placed in a positioning position as shown in FIG. The eyelet 8 is formed by drawing the eyelet while sequentially feeding it in the direction of the arrow through the pit hole 7.

Next, as shown in FIG. 3, the terminals are punched into a terminal shape including the eyelet 8, and then bent in the direction of the arrow as shown in FIG. Terminal 9 is formed. Although not shown in FIG. 4, each pair of uncut terminals 9 faces a pair of uncut terminals formed from another metal plate in a similar manner. Note that FIGS. 3 and 4 show the reverse sides.

By the above bending process, a pair of uncut terminals 9
The dimension between them (pitch width) is narrower than before bending, and the dimension after bending is set to be the same as the pitch between a pair of through holes in the insulating substrate, which will be described later. In this case, the pitch between each eyelet 8 can be set sufficiently larger than the intended dimension. Also, due to the above bending process, the root portions of the pair of uncut terminals 9 are
Since it is folded back 180 degrees to form a double layer, the holding strength of this part can be increased.

Then, as shown in FIG. 5, an insulating substrate 1 prepared in advance is arranged between pairs of uncut terminals 9 facing each other, and the eyelets 8 are inserted into through holes at both ends of the insulating substrate 1. , the insulating substrate 1 and the uncut terminals 9 are caulked. Note that a resistance layer 2 and a current collection layer 3 are previously formed on the upper surface of the insulating substrate 1 by a printing method or the like.

Next, a molding die (not shown) having a predetermined shape is placed on the insulating substrate 1 and filled with a synthetic resin material to form a substrate block 4 as shown in FIG. In this case, the holding strength of the base portion of each uncut terminal 9 is increased by the folding process as described above, so that the uncut terminal 9 will not be deformed by external force such as resin pressure.

Thereafter, the connected side of the uncut terminals 9 is cut and bent to form four terminals 5 into a shape as shown in FIG. 7 when viewed diagonally from below. In this way, a series of steps for forming predetermined terminals and substrate blocks on the insulating substrate is completed.

The above-mentioned manufacturing process is a series of steps in which the product is manufactured in a sequential manner using a press mold or a molding die while accurately positioning with the pitch holes 7, and the entire process can be automated without manual labor. After forming the terminals 5 and the board block 4 on the insulating substrate 1 in this way, a frame (not shown) is fixed above the board block 4, and a resistor is placed between the frame and the insulating substrate 1. A slider holder (not shown) having a slider (not shown) fixed to the lower surface thereof which slides on the layer 2 is housed to complete the sliding type variable resistor.

In FIG. 7, the metal mounting plate 10 provided below the insulating board 1 is for mounting the sliding type variable resistor in an appropriate position. This mounting plate 10 is fixed by heat welding. Moreover, FIG. 8 is a flowchart explaining the manufacturing process of the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of uncut terminals having eyelets are formed with one end of each connected, and the strength of the base of the uncut terminals is increased by folding. For,
The entire manufacturing process of forming terminals and board blocks on an insulating substrate can be automated, leading to cost reductions.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a completed product in which terminals and board blocks are formed on an insulating substrate, Fig. 2 is a perspective view showing the eyelet forming process, Fig. 3 is a perspective view showing the punching process, and Fig. 4. is a perspective view showing the bending process;
Fig. 5 is a perspective view showing the process of caulking eyelets on the insulating substrate, Fig. 6 is a perspective view showing the process of forming the board block, and Fig. 7 is a finished product in which terminals and board blocks are formed on the insulating board. Perspective view showing the back side, No. 8
The figure is a flowchart explaining the manufacturing process of the present invention. DESCRIPTION OF SYMBOLS 1... Insulating substrate, 2... Resistance layer, 4... Board block, 5... Terminal, 6... Metal plate, 8... Eyelet, 9... Uncut terminal.

Claims (1)

[Claims] 1. After continuously forming a plurality of eyelets on a band-shaped metal plate, by punching this metal plate, a plurality of uncut terminals having the eyelet at one end and connected at the other end are formed, After folding these uncut terminals in a direction that narrows the distance between adjacent pairs on their connecting end sides, the eyelets are inserted into the through holes of the insulating substrate provided with the resistance layer and caulked, and then the terminals are attached to the insulating substrate. Manufacture of a slide portable variable resistor characterized in that a substrate block is formed by filling synthetic resin material including the caulked portion, and then the uncut terminals are cut from the metal plate outside the substrate block. Method.