JPS6251201A - Manufacture of slide member for rotary type electric part - 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 [Field of Application of the Invention] The present invention relates to a method for manufacturing a sliding member in a rotary electric component such as a rotary variable resistor or a rotary switch.

[Background of the Invention] As a rotating electrical component, for example, a rotating variable resistor is provided with a slider in slidable contact with a resistor formed in an annular shape, and the circumference of the resistor of the slider is By displacing the contact position in the direction, the resistance value can be adjusted. In order to slide the slider, the slider is fixed to an adjustment knob, and by rotating the adjustment knob, the sliding position of the slider relative to the resistor is adjusted. .

Here, as a method for manufacturing a sliding member consisting of this slider and an adjustment knob, the slider is constructed. A slider structure consisting of a loop-shaped slider portion provided with a contact portion by pressing a hoop material made of a conductive metal material, and a connecting portion that holds the slider portion connected to the hoop material. The slider structure is connected to the hoop material by outsert molding the resin that forms the adjustment knob, and then the connecting part is separated from the hoop material. It has been known for a long time.

In this way, the slider is securely fixed to the adjustment knob, and
The slider needs to be held in a state in which it is firmly pressed against the resistor regardless of its sliding position, and for this purpose, the slider part is made of a contact point and a part that imparts spring properties to the contact point. Only the adjustment knob is exposed from the adjustment knob. Here, the sliding torque of this slider relative to the resistor is determined based on the exposed portion of the slider from the adjustment knob, and if this sliding torque is too large,
This will damage the resistor, but if the exposed portion of the slider is made larger in order to reduce this sliding torque, the slider will not be securely fixed to the adjustment knob, which is a drawback. There was. Particularly when miniaturizing this type of electrical component, it has been extremely difficult to ensure that the slider has good fixation to the adjustment knob while also obtaining a desired sliding torque.

[Object of the Invention] The present invention was developed in view of the above points, and its object is to reduce the sliding torque of the contact to the resistor in the slider part of the slider structure. It is an object of the present invention to provide a method for manufacturing a sliding member of a variable resistor, which enables continuous and automatic manufacturing of a sliding member that allows setting of the variable resistor to a desired value. It is.

[Summary of the Invention] In order to achieve the above-mentioned object, the method of the present invention includes a loop-shaped slider portion having contact points and a loop connected to the slider portion by pressing a hoop material. A slider structure is formed which includes a buried part shaped like a shape, and a connecting part that maintains a connected state between the slider part and the hoop material. An adjustment knob is formed by outsert molding with only the buried portion exposed and buried, and a leg portion is extended to the adjustment knob to connect it to the hoop material, and the connection portion is separated from the hoop material. ,
The slider portion is folded back toward the distal end side of the adjustment knob while being held connected to the hoop material by the leg portions, and the corresponding rear leg portion is separated from the hoop material to form a wide exposed portion, The present invention is characterized in that it provides a method for manufacturing a rotating electrical component having a desired sliding torque.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In this embodiment, a sliding member in a rotary variable resistor will be explained as an example of a rotary electric component.

The rotary variable resistor has a structure as shown in FIG. That is, in the figure, 1 is a cylindrical insulating case with a bottom, and the bottom wall inside the insulating case 1 is covered with a synthetic resin film,
A substrate 2 made of an insulating material such as ceramic is installed, and a resistor 3 is formed on the substrate 2 by means such as printing.Terminals 4 and 5 are connected to both ends of the resistor 3. The tip of each terminal 4.5 projects outward from the insulating case 1.

In the resistor 3-H, the loop-shaped slider portion 6a of the slider structure 6 made of a conductive spring material is connected to the contact portion 6b of the slider 7.
It is in movable contact. This slider structure 6 has its embedded portion 6C fixed to a first adjustment knob 7 rotatably attached to the insulating case l, and the first adjustment knob is attached on the opposite side. It also engages with a second adjustment knob 8 extending through the bottom of the insulating case l. These first and second adjustment knobs 7 and 8 have operating grooves that are rotated by a jig such as a screwdriver. a and 8a are formed respectively. Further, a terminal 9 connected to the slider 6 protrudes from the second adjustment knob 8 side.

The rotary variable resistor configured as described above has its terminal 4
, 5.9 are attached to the printed wiring board lO, and the first and second adjustment knobs 7, 8
A desired resistance value can be obtained by appropriately rotating either one of the two.

Next, a method for manufacturing a sliding member will be explained based on FIGS. 2 to 4.

First, as shown in FIG. 2, a hoop material 11 made of a conductive metal material is formed at both ends of the hoop material 1-1 with engagement holes 12, 12. ... by engaging a feeding member (not shown) and conveying the hoop material 11, and pressing the hoop material 11 to form a slider portion 8a having a contact portion 6b and a buried portion 6C.
are each formed into a loop shape, and the slider portion 6
A slider structure 6 is formed by forming a connecting portion 6d between a and the buried portion 6C, and connecting portions 8e and Be that keep the slider portion 6a connected to the hoop material 11. .

After forming the slider structure 6 by press working as described above, the buried portion 8C is housed in a mold, and the slider portion 6a is exposed to the outside and outsert molded with synthetic resin. As a result, the first adjustment knob 7 is formed as shown in FIG. At this time, the resin is drilled into the forming part of the first adjustment knob 7 and both edges of the hoop material 11.
4 to connect in a cross-linked state.

Thereafter, as shown in FIG. 4, the sliding part 6a is separated from the connecting part θe connected to the hoop material 11, and the slider part 6a is folded to the tip side of the first adjusting knob 7. return. As a result, the entire loop-shaped slider portion 6a applies a pressing force to the resistor 3 of the contact portion 6b. Moreover, even if the slider portion 6a is separated from the hoop material 11 in this way, the leg portion 14. , so that it will not fall off from the hoop material 11.

Furthermore, by separating the leg portions 14, the sliding member, which is assembled with the slider structure 6 and removed from the first adjustment knob 7, is separated from the hoop material 11. Then, the resistor is assembled by incorporating this sliding member into the insulating case l.

As described above, the entire slider portion 6a is exposed, and the resistance of the contact portion 6b is adjusted using the bent portion of the continuous portion 6d between the slider portion 6a and the buried portion 8C as a fulcrum. Since it can be pressed against the body 3, the size, thickness, etc. of the slider section 6a must be set appropriately.

Therefore, it is possible to obtain the desired pressing force, i.e., the sliding torque.

There is no inconvenience of damaging the resistor 3.
Stable operation can be ensured as a variable resistor. Furthermore, since the entire buried portion 60 is buried within the first adjustment knob 7, the slider structure 6 is fixed to the first adjustment knob 7 in an extremely stable state.

Furthermore, as described above, the slider structure 6 is separated from the hoop material 11 before bending the slider portion 6a, but there is no adjustment between the first adjustment knob 7 and the hoop material 11. Since the knobs 7 are held in a connected state by the resin legs 14, they do not fall off from the hoop material 11, and subsequent steps can be carried out continuously and automatically.

[Effects of the Invention] As detailed above, the method of the present invention involves insert molding the buried portion of the slider part of the slider structure with the adjustment knob in a state where it is exposed to the outside, and at this time, Since the adjustment knob and the hoop material are maintained in a bridged state by the legs, even if the slider part is separated from the hoop material in the subsequent process, it will remain connected to the hoop material by the legs. It is now possible to perform processes such as folding back the slider part while it is connected to the hoop material.
It is possible to continuously and automatically manufacture a sliding member for a rotating electric component that has a desired sliding torque, has good fixation of the slider structure to the adjustment knob, and is capable of smooth operation. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotary electric component showing an embodiment of the present invention, and FIGS. 2, 3, and 4 are explanatory views of the manufacturing process of a sliding member. 3: Resistor, 6: Slider structure, 6a: Slider part, 6b
= Contact portion, 6c: Buried portion, 6d: Connection portion, 7: First adjustment knob, 11: Hoop material. Figure 1 Figure 2

Claims (1)

[Claims] A slider part that is formed into a loop shape by pressing a hoop material and has a contact point, a buried part connected to the slider part, and a connected state between the slider part and the hoop material. A slider structure is formed by forming a slider structure consisting of a connecting part that is held in the slider structure, and a synthetic resin is externally molded with the embedded part of the slider structure in an embedded state, thereby forming an adjustment knob. The leg portions are extended to connect with the hoop material, the connecting portions are separated from the hoop material, the slider portion is folded back toward the distal end side of the adjustment knob, and then the leg portions are connected to the hoop material. 1. A method of manufacturing a sliding member for a rotating electrical component, characterized in that the sliding member is separated from the rotating electrical component.