Tone arm drive device

Details Tone arm drive device Tone arm drive device

1978-09-18

1980-05-27

Haroian, Harry N.

Undertaking

G11B 1706

Patent

active

042046874

ABSTRACT:
A tone arm drive device, comprises a tone arm drive mechanism driven by an electric motor rotatable in forward and reverse directions to vertically move and horizontally swing a tone arm. A first flip-flop circuit is triggered by signals instructing elevation and descent of said tone arm and a first logical gate generates an output of a logical product of a signal instructing a lowering position of the tone arm and an output signal of the first flip-flop circuit. A detecting circuit is employed to sense the upward movement limit point of said tone arm. A set-reset type flip-flop circuit receives an output from the first logical gate and an output of the detecting circuit as a "set" input and a "reset" input, respectively. A second logical gate is used for generating a logical product output of an output signal of the first flip-flop circuit and an output signal of the set-reset type flip-flop, with the output signal thereof being employed as a tone arm vertical movement control signal.

REFERENCES:
patent: 4049279 (1977-09-01), Kleis

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