Apparatus and method for controlling a tape drive to maintain a

Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system

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Details

242 7551, 242186, 242191, 360 73, B65H 5938, B65H 7700, H02P 546, H02P 768

Patent

active

041574885

ABSTRACT:
A tape drive including a drive motor; a take-up reel driven thereby; and a motor speed control system controlling the angular velocity of the drive motor for maintaining a substantially constant linear velocity of the tape as it is wound on the take-up reel, said control system comprising: a turns-counter counting the turns of tape as each is applied to the take-up reel; a presettable register; presetting means for presetting a predetermined number in said register at the beginning of a tape drive operation when the take-up reel is empty of tape; means for decrementing the register at a rate, with respect to the rate of application of turns onto the take-up reel, which is initially large during the application of a first predetermined number of turns, and which is subsequently reduced during the application of subsequent turns, to cause the contents of the presettable register to decrease in a non-linear manner with respect to the rate of increase in the number of turns applied to the take-up reel to approximate the non-linear relationship between the angular velocity of the drive motor and the diameter of tape on the take-up reel required to produce a substantially constant linear tape velocity; and motor control means controlling the angular velocity of the drive motor in accordance with the contents of the presettable register.

REFERENCES:
patent: 3764087 (1973-10-01), Paananen et al.
patent: 3769470 (1973-10-01), Curtis
patent: 3842326 (1974-10-01), Stocker
patent: 3910527 (1975-10-01), Buhler et al.

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