Digital open loop tape tension control circuit for tape recorder

Details Digital open loop tape tension control circuit for tape recorder Digital open loop tape tension control circuit for tape recorder

1980-10-30

1983-08-30

Weldon, Ulysses

Electricity: motive power systems

With particular motor-driven load device

Tension-maintaining type of motor-control system

318315, B65H 5938

Patent

active

044019238

ABSTRACT:
An open loop tension servo uses digital circuitry to automatically control motor torque and thus tape tension in, for example, a tape recorder, without the need for a tension sensor. To this end, the tape pack diameter of a tape takeup or supply reel is digitally computed, thus determining the motor torque required to maintain the requisite tension on the tape during the record or replay operating mode. A binary number indicative of the instantaneous tape pack diameter is generated and stored until a new number is available. Each stored number is supplied to D/A converter means formed of selected parallel or series resistor, arrays, wherein specific resistor combinations are successively selected to provide a corresponding change in resistance commensurate with the changing pack diameter represented by the changing size of the binary number. The resulting analog motor control voltage is fed to the motor drive amplifier to continuously regulate the motor torque and thus provide a constant tape tension as the tape pack diameter changes.

REFERENCES:
patent: 3061228 (1962-10-01), Andrade
patent: 3411055 (1968-11-01), Carter et al.
patent: 3849661 (1974-11-01), Beiter
patent: 3938757 (1976-02-01), Sargunar

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