JPS61199602A - Variable resistor stopping mechanism - 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 The present invention relates to a stopping mechanism for a variable resistor.

In particular, the present invention relates to a stopping mechanism for a variable resistor formed by meshing a shaft gear and a rotor gear.

(Prior Art) In this type of variable resistor that has been used conventionally, an elastic protrusion made of synthetic resin is provided on the rotor gear body and protrudes toward the housing. There is a configuration in which the worm gear and the rotor gear are engaged with each other by engaging with a fan-shaped groove provided in the housing.

More specifically, as shown in FIG. 7, the main body a of the rotor gear has a continuous annular part C which curves slightly toward the outer periphery of the annular part C which has teeth from the annular part which has no teeth. Drill a slit groove di that is shaped as shown in the figure. A finger-like elastic member ei surrounded on three sides by the slit groove d and whose ends are even-odd curved is connected to the float tire body, and a projection f is provided at the end thereof.
Since this protrusion is fitted into a fan-shaped groove provided in the housing and moves, it comes into contact with both side walls of the fan-shaped groove at the end of its movement as the rotor gear rotates, thereby completing the role of a stone. It is something.

(Problems to be Solved by the Invention) However, in the conventional mechanism described above, the structure of the protrusion provided on the rotor gear a is complicated, so when the variable resistor is downsized, the rotor gear a has a groove d. When the protrusion f1 is provided on the curved finger e surrounded by the curved finger e, it is difficult to configure the curved finger e to have sufficient elastic force. Therefore, there is a certain limit to the miniaturization of the rotor gear, and as a result, there are problems such as restrictions being imposed on the miniaturization of the variable resistor.

(Means and effects for solving the problem) In the present invention, instead of the rotor gear, a protrusion protruding toward the rotor gear body is provided on the housing, and the protrusion is omitted from the housing and is bored into the rotor gear body. This provides a simple configuration for engaging and disengaging the rotor gear and worm gear by fitting and rotating them into the provided fan-shaped groove, and it is possible to downsize the rotor gear and other components.

...When the rotor gear rotates, the protrusion provided on the housing fits into the fan-shaped groove, moves within the groove, and comes into contact with the side wall of the groove, so the repulsive force prevents the rotor gear from engaging and disengaging from the worm gear. It is done smoothly. As a result, the helical coil wiper slides on the fan-shaped resistor provided on the pace and functions as a variable resistor.

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

In the accompanying drawings, FIGS. 1 and 2, a housing 1 houses a shaft gear 2 and a rotor gear 3 that meshes with the shaft gear 2. As shown in FIGS. A silicone rubber 4 is accommodated in a trapezoidal cross-sectional groove 3c provided in the rotor gear 3, and pin terminals 5a, 5b, 5c
The helical coil wiper 7 is held by the pace 6 and the silicon rubber 4, which are connected through the electrode body, and as the rotor gear 3 rotates, the thin film resistor 8 on the pace 6
slide on top. Further, the rotor gear 3 is provided with a fan-shaped groove 9 that opens in the direction of the shaft ear 2. ←t←→Sign 9
9a and 9b each illustrate the end inner wall of the fan-shaped groove 9. In FIG. 3, the inner circumferential wall of the rotor gear 3 consists of a portion with a plurality of teeth 3a and an annular portion 3b without teeth. FIG. 4 is a plan view of the inside of the housing 1 viewed from the direction of the rotor gear 3. FIG. A press-fit hole 10 for the shaft gear 2 is formed in the housing 1, and reference numeral 11 designates an elastic bar-shaped protrusion that is integrally formed on the main body of the housing 1. As will be described later, this protrusion 11 is fitted into a fan-shaped groove 9 provided in the rotor gear 3, and as the rotor gear 3 rotates, it comes into contact with the side walls 9a, 9b of the groove to serve as a stopper. FIG. 5 is a plan view of the pace 6.

A fan-shaped thin film resistor 8 is arranged on the base 6, and the electrode body 1
2a, 12b, 12c via pin/terminals 5a, 5b, 5
c, etc. are connected to the pace 6 in a energized manner.

Attached drawings Figure 6 (4), (B), (0), (
D) shows the operating principle of the stop mechanism of the present invention.

When the shaft gear 2 is rotated in the counterclockwise direction of the arrow as shown in FIG. 6(4), the teeth 2a of the shaft gear 2 and the teeth 3a of the rotor gear 3 are sequentially engaged, and the rotor gear 3 is rotated in the direction of the arrow. A helical coil wiper 7 housed within the rotor gear 3 slides on a thin film resistor 8. Along with that, No. 1
The elastic rod-shaped protrusion 11 of the housing 1 moves in the fan-shaped groove 9 formed in the rotor gear 3, and at the same time as the helical coil wiper 7 reaches the end of the thin film resistor 8, the protrusion moves.
It abuts against the end inner wall 9a of the fan-shaped groove 9. On the other hand, the tooth portion 2a of the shaft gear 2 meshes with a tooth portion disposed at the end of the tooth portion 3a of the rotor gear 3.

Next, when the shaft gear 2 is rotated (Fig. 6 (
(See t3)) Since the teeth disposed at the end of the teeth 3a of the rotor gear 3 further rotate in the direction of the arrow while meshing with the teeth 2a of the shaft gear 2, the elastic bar-shaped protrusion 11 is drilled into the rotor gear 3. The rod-shaped protrusion 11 strongly abuts against the end inner wall 9a of the fan-shaped groove 9 and generates a repulsive force acting in the direction opposite to the rotational direction of the rotor gear 3, while the rod-shaped protrusion 11 curves and deforms to the position shown in FIG. 6 (Bl). Further, as the shaft gear 2 continues to rotate (see FIG. 6(0)), the teeth 3 of the rotor gear 3
The tooth portion disposed at the terminal end of a and the tooth portion 2a of the shaft gear 2
The rotor gear 3 is disengaged from the shaft gear 2, and due to the repulsive action caused by the deformation of the bar-like protrusion 11 provided on the housing 1, the rotor gear 3 is reversed to maintain full engagement with the shaft gear 2 again.
At 0 rotation, it stops. Along with this, the above-mentioned IJ connector 7, which had rotated along with the rotor gear 3, also comes to a complete sliding stop at one end of the thin film resistor 8.

Next, when the shaft gear 2 is rotated clockwise in the opposite direction to that described above (see Fig. 6 (D)), the teeth 3a of the rotor gear 3 mesh with the teeth 2a of the shaft gear 2, and the gear 1 rotates clockwise in the direction indicated by the arrow. The end inner wall 9b of the fan-shaped groove 9 of the rotor gear 3 abuts against the rod-shaped protrusion 11 of the housing 1, and the rotor gear 3 stops rotating and sliding.

In this way, the helical coil wiper 7''f can be slid onto the fan-shaped thin film resistor 8.

As described above, in the present invention, when the helical coil wiper 7 is made to slide over the fan-shaped thin film resistor 8 via the rotor gear 3 by continuously rotating the shaft gear 2 in one direction, it is integrated with the housing 1. The elastic rod-shaped protrusion 11 moves within the fan-shaped groove 9 formed in the rotor gear 3, and after contacting either of the end inner walls 9a, 9b of the fan-shaped groove, the shaft gear 2 and the rotor gear 3 are moved. As the rotor gear 31f! rotates more than that applied by the meshing of the rotor gear 31f!, a repulsive force is generated due to the deformation of the elastic bar-shaped protrusion 11 protruding from the housing 1, and the rotor gear 31f! : It has a stop function that causes it to rotate in the opposite direction, and a rotor gear with no teeth provided on a part of the inner circumferential wall is used to allow the helical coil wiper to slide on the sector-shaped resistor.

(Function) The stopping mechanism of the present invention does not use any complicated members, but simply moves an elastic bar-shaped protrusion integrally provided on the housing body within a fan-shaped groove bored into the rotor gear, and the stop mechanism of the present invention does not use any complicated members. By bringing the protrusion into contact with the shaft gear and the rotor gear.

By sliding the helical coil wiper ξ on the resistor and stopping it, it is possible to obtain an extremely simple stopping mechanism for a variable resistor with high performance and a small number of component parts. Compared to a configuration in which an elastic protrusion having a similar shape is provided and rotated within a fan-shaped groove of the housing, the configuration is simpler and the variable resistor can be made more compact.

[Brief explanation of the drawing]

FIG. 2 is a perspective view of FIG. 1. A plan view of the third rotor gear. FIG. 4 is a plan view showing the inside of the housing. Figure 5 is a plan view of the pace. Figure 6 (A), CB)
, (C) are line cross-sectional views showing the action of the variable resistor stopping mechanism according to the present invention. FIG. 7 is a plan view of a rotor gear of a resistor showing a conventional example. 1...Housing 2...Shaft gear 2a...Shaft gear teeth 3...Rotor gear 3a...Rotor gear teeth 9. ...Fan-shaped grooves 9a, 9b...Fan-shaped groove side walls 11...Elastic rod-shaped protrusion Patent applicant Copal Electronics Co., Ltd. Representative Patent attorney Sakae Kobayashi Fig. 1 Fig. 2 Reason @ Fig. 3 Wk Fig. 5 Fig. 5 Crane 6 Figure W & 6 Figure W & 7 Procedure Amendment (Method) 1. Indication of the case 1985 Patent Application No. 040527 2, Title of the invention Stopping mechanism for variable resistor 3, Person making the amendment Relationship to the case Patent applicant H, 6; t Tokyo - Shiji No-chome 17 Mr. 1
Name: Copal Electronics Co., Ltd. 4. Agent: 160 Name (7510) Patent Attorney Sakae Kobayashi Phone: 374-58130 5. Date of amendment order: June 25, 1985 (shipment date)
e, number of inventions increased by amendment 7, subject of amendment column 1 for brief description of drawings in the specification,
"Figure 6 (A), CB), (
C)" is corrected to "Fig. 6 (A), (B), (C), CD)J.

Claims (1)

[Claims] 1. In a multi-rotation variable resistor in which a multi-contact wiper attached to a rotor gear meshing with the shaft gear slides on a resistor as the shaft gear rotates, an elastic protrusion integrally formed with the housing and a rotor gear main body having a fan-shaped groove formed inside of which the protrusion is movable, and the rotor gear including a toothed portion and a portion without toothed portion is configured to rotate in response to rotation of the shaft gear in a predetermined direction. Due to the movement, the elastic protrusion comes into contact with the inner wall of either side of the fan-shaped groove, deforming the elastic protrusion, and the repulsive force caused by the deformation prevents the shaft gear from idling in the part of the rotor gear that does not have teeth. A variable resistor stopping mechanism characterized in that a shaft gear and a rotor gear easily maintain meshing when a repulsive force is generated to return the rotor gear to its original position and the rotor gear is rotated in the opposite direction. 2. The variable resistor stopping mechanism according to claim 1, wherein the housing and the elastic protrusion are made of synthetic resin such as plastic. 3. The variable resistor stopping mechanism according to claim 1, which has a rod-shaped elastic protrusion projecting from the housing body.