Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1982-07-28
1984-02-14
Christian, Leonard D.
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
226 1, 226188, 318326, B65H 5938, B65H 7700, G05B 500, H02P 500
Patent
active
044319509
ABSTRACT:
Apparatus and method for controlling the speed of a tape drive having an ingoing capstan and an outgoing capstan with a magnetic head therebetween. First and second phase lock loop servo-circuits for driving first and second dc motors which drive the ingoing and outgoing capstans, respectively. A stable reference oscillator providing the reference frequency to one of the phase lock loop servo-circuits and to another phase lock loop circuit which provides the reference frequency to the other phase lock loop servo-circuit. The feedback frequency in the third phase lock loop circuit is adjustable to control the difference in the two reference frequencies to the two servo-circuits for the purpose of controlling the difference in speeds of the ingoing and outgoing capstans.
REFERENCES:
patent: 3295032 (1966-12-01), Branco
patent: 3586221 (1971-06-01), Rosen
patent: 3644806 (1972-02-01), Belson et al.
patent: 3826961 (1974-07-01), Hayase et al.
patent: 3889169 (1975-06-01), Hirschman et al.
patent: 4266168 (1981-05-01), Andersen
Magnetic Tape Unit Capstan Servomechanism, IBM Technical Disclosure Bulletin, vol. 15, No. 10, Mar. 1973, J. O. Mitchell, S. D. Roberts and R. W. Van Pelt, p. 2988.
Cetec Corporation
Christian Leonard D.
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