Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1975-03-12
1976-09-21
Dobeck, B.
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
242186, B65H 5938
Patent
active
039821609
ABSTRACT:
A tape tension control system is provided which controls the rotation of two tape reels to maintain substantially constant tension of the tape over its full length for all operational modes. The device utilizes inputs from two reel tachometers and a tape counter-roller for controlling the torque applied to each reel by AC induction motors. The tape counter-roller effectively measures the linear velocity of the tape which is driven by a capstan and the tachometers measure the rotational velocity of each reel. Appropriate logic circuitry, supplied with these velocity readings, enables the system effectively to sense tape diameter on each reel for providing the necessary torque to each reel to maintain uniform tape tension. This system provides for rapid start of the reels to allow for fast lock-in of the capstan and also controlled starts in fast modes such as rewind and fast-forward to prevent high stresses on the tape. A memory capability is provided for storing the diameters of the tape reels when the machine is placed in a stop mode. In addition, during the loading operation in the thread mode, proper diameter information is fed to the reel memories upon a minimal rotation of the tape reels.
REFERENCES:
patent: 3673473 (1972-06-01), Werner
patent: 3809335 (1974-05-01), Mantey
patent: 3910527 (1975-10-01), Buhler
Dischert William Arnold
Goldschmidt Arthur Marvin
West Joseph Richard
Dobeck B.
RCA Corporation
Whitacre Eugene M.
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