Phonograph record player

Details Phonograph record player Phonograph record player

1976-11-09

1978-08-22

Stephan, Steven L.

Undertaking

274 1L, 274 15R, G11B 1706

Patent

active

041084446

ABSTRACT:
In a phonograph record player, an improved control mechanism is provided for effecting lead-in movement of a tone arm from an elevated rest position outside the perimeter of a turntable to a selected set-down position on a record supported by the turntable so as to commence a play operation, and for effecting a return movement of the tone arm to its rest position upon the termination of the play operation. In such control mechanism, a lever assembly is angularly displaced by a cam follower engaging in a cam groove of a control gear to effect the lead-in and return movements during turning of the control gear by engagement of a drive gear with first and second sets, respectively, of teeth on the control gear which are separated by first and second toothless gaps facing the drive gear in stop and play positions, respectively, of the control gear. In order to initiate turning of the control gear from such stop and play positions, lead-in and return clutches are mounted at diametrically opposed locations on the control gear and are adapted to be selectively engaged by movement of a single actuating slide to its operative position in response to energizing of an electromagnetic element with the control gear in its stop position or play position, respectively. Thus, merely by controlling the single actuating slide, particularly through selective energizing of the electromagnetic element, lead-in, return or reject and repeat operations of the record player can be simply achieved.

REFERENCES:
patent: 3007704 (1961-11-01), Erwood
patent: 3305239 (1967-02-01), Hathaway
patent: 3438635 (1969-04-01), Hansen

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