Tape speed control apparatus for magnetic tape device

Details Tape speed control apparatus for magnetic tape device Tape speed control apparatus for magnetic tape device

1975-02-03

1976-10-05

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

242186, 242191, 318309, G11B 1552, G11B 1924

Patent

active

039848680

ABSTRACT:
Improved apparatus for controlling tape speed in a reel-to-reel magnetic tape transport system. A controllable reel drive motor operates in response to a control signal derived from an accumulated count of reel revolutions so that the driven reel is driven at a varying angular velocity chosen to produce a substantially constant predetermined tape speed as the tape is wound. In order to more accurately maintain a constant tape speed an indication of tape speed error is obtained by measuring and comparing with a reference the elapsed time between the writing and recording of a signal using a magnetic head arranged for read-after-write operation, any resulting tape speed error being employed to change the accumulated count in a direction which reduces the tape speed error.

REFERENCES:
patent: 3439354 (1969-04-01), Behr et al.
patent: 3500362 (1970-03-01), Schmitz et al.
patent: 3582781 (1971-06-01), Uemura et al.
patent: 3646535 (1972-02-01), Behr
patent: 3666883 (1972-05-01), Yano et al.
patent: 3764087 (1973-10-01), Paananen et al.

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