Stylus position control system

Details Stylus position control system Stylus position control system

1977-02-14

1978-12-05

Stephan, Steven L.

Undertaking

274 23B, 358128, G11B 310

Patent

active

041282477

ABSTRACT:
A stylus arm, pivotally mounted at one end within a stylus housing, supports a stylus at its free end. A stylus arm rest including a permanent magnet is mounted in the stylus housing for movement between an elevated position and a depressed position. The housing is subject to translatory motion between a rest position, clear of a disc record supporting turntable, and playback positions over the turntable. A brush is mounted in proximity to the turntable and beneath the path of travel of the housing, with the bristles of the brush extending, from a holder which is mounted on a height adjustable platform, in directions substantially perpendicular to the direction of housing travel. As the housing reaches an intermediate position in passage toward the rest position, the stylus arm rest is depressed when the permanent magnet affixed thereto is attracted by a second permanent magnet mounted on the platform. The depression of the stylus arm rest causes the stylus arm to assume a lowered position where the stylus arm is supported by a guide mounted on the platform. During completion of the passage from the intermediate position to the rest position, the stylus arm slides over the guide allowing the stylus to pass through the brush bristles which clean debris therefrom; at the rest position, the stylus will be supported by the guide at an elevation substantially corresponding to the stylus elevation obtained during disc record engagement in the course of playback.

REFERENCES:
patent: 4040635 (1977-08-01), Leedom

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