Simplified phonograph capable of selecting desired grooves on a

Details Simplified phonograph capable of selecting desired grooves on a Simplified phonograph capable of selecting desired grooves on a

1979-05-29

1980-11-18

Stephan, Steven L.

Undertaking

46175AR, G11B 308, G11B 1706

Patent

active

042341930

ABSTRACT:
A plurality of record grooves (2) are formed on a record disc (3) starting point (4). The grooves are positioned at radially different points of the record disc. When a pickup (6) is returned to each starting point (4) of the record groove (2) by means of a return spring (7) acting on a tone arm (8), the pickup (6) is positioned so as to be able to select one of the starting points of the record grooves. The selected groove corresponds to the planar position of this device, i.e., whether vertical or horizontal. The pickup 6 is positioned by means of a movable stopper 9 (a) correlated with a weight means (10).
An upright concentric cam (20) is provided near the center of the record disc (3) for releasing the record disc (3) from a stylus force applied thereto. This enables a sound transmitting member (22), which urges the pickup toward the record disc in playing, to be raised up and released from the stylus force when the pickup reaches the end or terminal point of sound reproduction. An inclined face of the cam, for lowering the swingable arm (13), subsequent to its initial raising up motion, is positioned at a point prior to the starting points of the record grooves, namely, in such a manner that the pickup is depressed onto the record disc prior to the arrival of the starting points at the position of the device where said pickup is lowered.

REFERENCES:
patent: 3620538 (1971-11-01), Mercer et al.
patent: 4150832 (1979-04-01), Watanabe

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