Patent
1975-07-28
1976-10-26
Canney, Vincent
H04M 164
Patent
active
039885429
ABSTRACT:
Apparatus in an automatic telephone answering device utilizing a single motor for scanning a tone arm across a grooveless recording disc to selectively play back a message magnetically recorded thereon in a spiral path as well as for rotating the turntable. The apparatus includes an electromagnetic clutch powered by a positive belt drive coupled to the motor for driving a spirally contoured cam to transport the tone arm across the disc. A control circuit including an optoelectronic switch positioned adjacent the edge of the turntable to receive light reflected from a reflective spot on the turntable edge is also provided to initiate scanning by the tone arm coincident with the reflective spot passing by the optoelectronic switch. This insures that the tone arm transducer will begin scanning at the same point for each subsequent playback and/or record operation and, as a result, track the spiral recording path on the grooveless disc.
REFERENCES:
patent: 3187108 (1965-06-01), Clin et al.
patent: 3226478 (1965-12-01), Martin
patent: 3426152 (1969-02-01), O'Halloran et al.
patent: 3649762 (1972-03-01), Okamura
patent: 3705265 (1972-12-01), Buglewicz
patent: 3784721 (1974-01-01), Kilby
Black Robert J.
Canney Vincent
GTE Automatic Electric Laboratories Incorporated
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