Tone arm mechanism for a record player

Details Tone arm mechanism for a record player Tone arm mechanism for a record player

1981-06-15

1984-04-24

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369246, G11B 1700

Patent

active

044452101

ABSTRACT:
In a tone arm elevating mechanism, an elevator, which is arranged to raise and lower the tone arm, is driven by a solenoid, and the mechanism comprises a first rotary lever contactable with a portion of the elevator and a second rotary lever arranged to be driven by the solenoid, where the second rotary lever is operatively linked with the first rotary lever by means of an elastic member which prevents transmission of shock. Thus, the reciprocating movement of the solenoid is converted into rotational force to cause the elevator to rise gently and slowly. A viscous and resistive material may be provided to the elevator so that the elevator slowly lowers when the solenoid is deenergized. A portion of the elevating mechanism functions as an electrical switch to detect the highest position of the tone arm, while another portion may also function as another switch to detect the fact that the stylus has been placed on the record disk. The information from these switches may be fed to a circuit which controls various operations of the tone arm, thereby control of horizontal movement of the tone arm as well as antiskating can be accurately and precisely performed.

REFERENCES:
patent: 2952464 (1960-09-01), Stimler
patent: 3385603 (1968-05-01), Kropfle
patent: 3534967 (1970-10-01), Freier
patent: 3717350 (1973-02-01), Oakley et al.
patent: 3734512 (1973-05-01), Osborne et al.

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