JPH0344005A - Manufacture of variable resistor - Google Patents

Abstract

PURPOSE:To simplify arrangement of a resistor substrate for simplifying positioning of the resistor substrate with respect to terminals by providing dummy lugs having a pilot hole on a part of the resistor substrate. CONSTITUTION:Resistor substrates 1 provided with a dummy lug 22 having a pilot hole 21 on a part of a first hoop material 20 comprising ceramic are coupled with one another via slits 23. On each resistor substrate 1 of the first hoop material 20, a resistor 2 and a collector ring 3 are print-formed, and then the first hoop materials 20 is split by the slit 23 to form individual resistor substrates 1. A second guide pin provided on a base is inserted into the pilot hole 21 of the dummy lug 22 of the resistor substrate 1 to position the substrate 1 and then terminals 10, 11, 12 are bent on the resistor and the collector ring to be tightened. Then the dummy lug 22 is cut. Then the terminals 10, 11, 12 are bent in convenient shapes as well as unnecessary parts are cut so that individual variable resistors are split from one another finally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a sealed variable resistor for industrial equipment.

[Conventional technology]

Figures 11 to 13 are explanatory diagrams of conventional examples, where Figure 11 is a top view of a conventional variable resistor, and Figure 12 is A-A in Figure 11.
A cross-sectional view of the line, FIG. 13 is a bottom view.

In the drawing, 1 is a resistor board, and a resistor 2 is mounted on the board 1.
, a current collecting ring 3 is formed. Reference numeral 4 denotes a case that is outsert-molded on the substrate 1. A sliding preview 7 to which a slider 6 is fixed is rotatably fitted into the recess 5 of the case 4, and a lid is provided on the open surface of the case 4. 8 is covered. Reference numeral 9 denotes a waterproof O-ring made of silicone rubber and interposed between the resistance substrate 1, the sliding member 7, and the case 4. The terminals 10 and 11 at both ends of the resistor 2 and the terminal 12 connected to the current collecting ring 3 are bent as appropriate after being buried in the case 4.
The tips 10a, 11a, and 12a protrude outward from the bottom surface of the case 4.

Although not shown in the drawings, the variable resistor described above includes a first hoop material made of an insulator connected to a resistor substrate 1, terminals 1 and 3 at both ends of the resistor 2, and terminals of the current collector ring 3. 12
form a set, and this set consists of a plurality of connected thin metal plates 1'
), and after forming a resistor 2 and a current collector ring 3 on each resistor board of the first hoop material, the resistor board 1 is divided into individual resistor boards 1, and is positioned on a base. Each set of terminals 10, 11. of the second hoop material is made of a thin metal plate. ,
The resistor board 1 is placed on the terminal 12, and each terminal 10, 11,
After connecting 12 to the specified locations, the resistor board 1 was shaped as an outsert, and the case 4 was formed.

[Problem to be solved by the invention]

However, in the variable resistor described above, in order to have a waterproof function, the resistance board 1 is not provided with an axial penetrating hole, and therefore the resistance board 1 is aligned using this hole and the second hoop is formed. It was difficult to position the resistor board 1 to the terminals 10, 11, and 12 of the material.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to facilitate the alignment of the resistor boards during assembly and the positioning of the resistor boards placed on the second hoop material. The present invention attempts to provide a method for manufacturing a variable resistor.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention forms a pair of a first hoop material which is better than an insulator connected to a resistor board, terminals at both ends of the resistor, and terminals of a current collecting ring. A second hoop material made of a plurality of connected thin metal plates is provided, and after forming a resistor and a current collector ring on each resistance substrate of the first hoop material, the group is divided into individual resistance substrates, After placing a resistance board on each set of terminals of the second hoop material positioned on the base and connecting each terminal to a predetermined location, the resistance board is outsert molded to form a case. In the method for manufacturing a resistor, a dummy projection with a pilot hole is provided on the resistance board, a rod is inserted into the pilot hole of the projection to align the resistance board, and the pilot hole is inserted into the guide pin of the base. Holes are inserted to enable positioning of the terminals and the resistor board.

[Effect]

According to the method of the present invention, the resistance boards can be aligned by providing a dummy projection with a pilot hole on the resistance board and inserting a rod into the pilot hole.
The resistance board can be smoothly supplied to the second hoop material, and by inserting the pilot hole of the dummy protrusion into the guide pin of the base when placing the resistance board on the second hoop material. , the resistance board can be easily positioned with respect to the terminal.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 10 are detailed explanatory diagrams of the present invention.

FIG. 1 is a plan view of the first hoop material to which the resistance board is connected;
Fig. 2 is a plan view of a state in which a resistor and a current collecting ring are formed on each resistance board of the first hoop material, and Fig. 3 is a plan view of the resistance board divided from the first hoop material of Fig. 2. , FIG. 4 is a perspective view showing a state in which a plurality of resistor boards are arranged and stored, FIG. 5 is a plan view of the second hoop material connected in series with the terminal, and FIG. 6 is the second hoop material. 7 is a partially enlarged plan view of FIG. 6, and FIG.
The figure is a perspective view of the same, FIG. 9 is a plan view of the dummy projection of FIG. 6 cut away, and FIG. 10 is a perspective view of the same.

In FIG. 1, reference numeral 20 denotes a first hoop material made of ceramic □tsuk 0, and a □-protrusion 22 with pilot holes 21 in a part.
The resistor substrates 1 provided with the resistor substrates 1 are connected via the slits 23.

A resistor 2 and a current collector ring 3 are printed and formed on each resistor substrate 1 of this first hoop material 20, and then the first hoop material 20 is divided by slits 23 into individual parts as shown in FIG. A resistive substrate 1 is formed.

Next, the pilot hole 2 of the dummy protrusion 22 of each resistor board 1 is
A rod 24 is inserted into the resistor substrates 1, and the resistance substrates 1 are aligned and stacked.

In FIG. 5, reference numeral 25 denotes a second hoop material made of a metal plate, which is connected to both ends of the resistor 20 with one terminal 10 degrees and three terminals 11.
．． and two terminals 12 connected to the current collecting ring 3 are continuously formed on one metal plate.

This second hoop material 25 is placed on the base by inserting the guide holes 26 provided on the upper and lower sides into the first guide pins 28 provided on the base (not shown) on the lower surface of the hoop material 25. At the same time, the pilot hole 21 of the dummy protrusion 22 of the resistance board 1 is placed.
into the second guide pin 29 provided on the base to connect a pair of terminals 10, 11. , 12, and then a portion 10a=11a of the terminals 10, 11.
1.2a of the terminal 12 by bending it over the resistor 2 and tightening it.
& Bend it onto the current collector ring 3 and tighten it.

Next, the dummy protrusion 22 is cut as shown in FIGS. 9 and 10.

Next, the resistor board with the terminals 10, 11, 12 attached in this manner is outsert molded to form a molded case 4, and the terminals 10, 1.1, 1.
2 is buried in case 4.

Next, the terminals 10, 11, and 12 are bent into appropriate shapes as shown in FIGS. 11 to 13, and the terminals 10,
11.

Cut off 12 unnecessary parts and finally divide into individual variable resistors.

According to the present invention, as described above, since the dummy protrusion 22 having the pilot hole 21 is provided on the resistance board 1, the resistance board 1 can be aligned by inserting the rod 24 into the pilot hole 21. Second hoop material 2
The supply of resistor board 1 to 5 can be done smoothly,
Also, when placing the resistance board on the second hoop material 25, the dummy protrusion 22 is attached to the second guide pin 29 of the base 27.
By inserting the pilot hole 21 of the terminal 10
, 11, 12 can be easily positioned, which is effective in improving the productivity of variable resistors using automatic machines.

〔Effect of the invention〕

According to the method of the present invention, by providing a dummy projection having a pilot hole in a part of the resistor board, the resistor boards can be easily aligned.

The resistor board can be easily positioned with respect to the terminal, and is effective in improving the productivity of variable resistors using automatic machines.

[Brief explanation of drawings]

1 to 10 are detailed explanatory diagrams of the present invention, in which FIG. 1 is a plan view of a first hoop material with a resistor board arranged in series, and FIG. , a plan view of the first hoop material forming a current collecting ring, FIG. 3 is a plan view of each resistor board divided from the first hoop material of FIG. 2, and FIG. 4 is a plan view of a plurality of resistor boards FIG. 5 is a plan view of the second hoop material with terminals arranged in series, and FIG. 6 is a perspective view showing the condition in which the terminals are arranged and stored. FIG. Fig. 7 is a partially enlarged plan view of Fig. 6, Fig. 8 is a plan view of the mounted state.
The figure is a perspective view of the same, Figure 9 is a plan view of the state in which the d-protrusion of Figure 6 is cut, Figure 10 is a perspective view of the same, Figures 11 to 13
The figure shows a conventional variable resistor. FIG. 11 is a top view, FIG. 12 is a sectional view taken along line A--A in FIG. 11, and FIG. 13 is a bottom view. 1...Resistance board, 4...Case%10
, 11.12... terminal, 20... first
Hoop material%21...Pilot hole%22...
...Dummy protrusion, 24.Old...Rod bar, 25.
...Second hoop material, 29...Guide pin.

Claims (1)

[Claims] A first hoop member made of an insulator connecting a resistor board, terminals 1 and 3 at both ends of the resistor, and two terminals of a current collecting ring form a set, and this set forms a hoop member made of a plurality of connected thin metal plates. 2
After forming a resistor and a current collecting ring on each resistor board of the first hoop material, dividing it into individual resistor boards,
After placing a resistance board on each set of terminals of the second hoop material positioned on the base and connecting each terminal to a predetermined location, the resistance board is outsert molded to form a case. In the method for manufacturing a resistor, a dummy protrusion having a pilot hole is provided on the resistor board, and a rod is inserted into the pilot hole of the protrusion to align the resistor board,
A method for manufacturing a variable resistor, characterized in that the pilot hole is inserted into a guide pin of a base to enable positioning of the terminal and the resistor board.