Circuit for controlling the speeds of two capstans

Details Circuit for controlling the speeds of two capstans Circuit for controlling the speeds of two capstans

1981-10-01

1984-09-11

Weldon, Ulysses

Electricity: motive power systems

With particular motor-driven load device

Tension-maintaining type of motor-control system

318 6, 318398, B65H 5938

Patent

active

044712723

ABSTRACT:
The speeds of two capstans of a dual capstan type tape recorder are individually controlled by respectively associated first and second phase locked loops. Each phase locked loop includes a speed detector for generating pulses at a frequency corresponding to the rotational speed of the associated capstan, a phase detector receptive of the pulses and a motor for driving the associated capstan in response to the output of the phase detector. A reference frequency oscillator supplies a constant frequency signal to a first frequency divider and to a second, programmable frequency divider which are respectively associated with the first and second phase locked loops. The first and second frequency dividers feed their outputs to the phase detectors of the first and second phase locked loops, respectively, to allow phase comparison with the received pulse to control the associated motors. The programmable frequency divider is controlled by a preset input to vary its frequency division ratio so that the speed of the capstan on the supply reel side is driven at a speed slight lower than the speed of the other capstan to maintain the recording tape between them under taut condition.

REFERENCES:
patent: 3329876 (1967-07-01), Branco
patent: 3861573 (1975-01-01), Kawasaki et al.
patent: 3982160 (1976-09-01), Goldschmidt et al.
patent: 4160195 (1979-07-01), Sakamoto
patent: 4321515 (1982-03-01), Honda
patent: 4321687 (1982-03-01), Parsons et al.
J. D. Mitchell, et al., "Magnetic Tape Unit Capstan Servomechanism", IBM Technical Disclosure Bulletin, vol. 15, No. 10, Mar. 1973, pp. 2988-2990.

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