Motor driven slide variable resistor

Abstract

To provide a motor-driven sliding variable resistor having reduced in variation in working speed when a motor is driven and in the sense of operation when it is manually operated, and capable of maintaining performance for a long period of time. The resistor is provided with a frame 1 having a motor 2 attached on its one end; a driving pulley 3 coupled to a rotary shaft 2a of the motor; a driven pulley 5 arranged on the other end of the frame; a circular belt 6 stainedly hung over between the driving pulley and the driven pulley; and a variable resistor 8 attached to the frame so that a resistance value is adjusted by the movement of a moving body 7 coupled to the belt in the longitudinal direction of the frame. A movable member 4 movable in the longitudinal direction of the frame is provided at the other end of the frame, a pillar 11 for pivotally supporting the driven pulley, an attaching portion 4e is formed on a position different from the position where the pillar is fixed to the movable member, and the movable member is attached to the frame at the attaching position.

Description

Technical field [0001] The present invention relates to a motor-driven sliding type variable resistor used in a mixer for audio equipment and the like. Background technique [0002] As the structure of the conventional motor-driven sliding type variable resistor, the following structure is known, which has: an elongated cross-sectional L-shaped frame; an operating lever is inserted through a straight line provided in the frame Sliding variable resistor with slits; a motor with a timing pulley mounted on the front end of the rotating shaft fixed to one end of the frame in the longitudinal direction; a driven belt rotatably mounted on the other end of the frame Wheels; and an endless timing belt spanned between these timing pulleys and driven pulleys, and whose middle portion is fixed to the operating lever (for example, refer to Patent Document 1). [0003] The structure of the existing motor-driven sliding variable resistor is shown in Figure 11 to Figure 13 Shown. [0004] Fig....

AI Technical Summary

Problems solved by technology

[0014] However, in the structure of the conventional motor-driven sliding type varistor, since the driven pulley rotates through the rivet, the rivet also rotates a little during use, and the mounting position of the rivet changes. As a result, the tension (tension condition) of the belt that has been adjusted changes, so there is a problem that the moving speed changes when the motor is driven.

[0015] In addition, in the case of using a plurality of them in parallel, if there is a large difference in the respective moving speeds, there is a problem that the quality level of the device (set) will be impaired.

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