Control system for spool drive of magnetic tape apparatus

Details Control system for spool drive of magnetic tape apparatus Control system for spool drive of magnetic tape apparatus

1978-07-25

1980-11-25

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318317, 318329, 318503, H02P 516

Patent

active

042361028

ABSTRACT:
A control system for a magnetic tape apparatus having two spool carriers driven by D.C. drive motors to control the current in one of the motors in order to maintain a uniform tape transport speed comprises a pulse generator driven by the tape, a comparator which compares the timing of the pulses from the generator with a standard and generates a pulse-width modulated output, a transistor switch amplifier, a low-pass filter converting the amplified pulse-width modulated signal to a control voltage, and a direct voltage amplifier supplying a current to the drive motor controlled by the control voltage.

REFERENCES:
patent: 3178633 (1965-04-01), Slusher et al.
patent: 3510756 (1970-05-01), Chute
patent: 3596162 (1971-07-01), Takayama
patent: 3629677 (1971-12-01), Means
patent: 3701004 (1972-10-01), Tuccinardi et al.
patent: 3748559 (1973-07-01), Steinmann
patent: 3812410 (1974-05-01), Schaub et al.
patent: 3878446 (1975-04-01), Brandt
patent: 3934269 (1976-01-01), Fujita et al.
patent: 3970909 (1976-07-01), Minakuchi

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