Tape transport control unit

Details Tape transport control unit Tape transport control unit

1982-12-08

1985-06-25

Shoop, William M.

Electricity: motive power systems

With particular motor-driven load device

Tension-maintaining type of motor-control system

242 7551, H02P 546

Patent

active

045256543

ABSTRACT:
A magnetic tape in a reel-to-reel magnetic apparatus is transported directly from a supply reel to a take-up reel without a mechanical buffer or a vacuum column buffer.
Separate drive motors are coupled to the respective reels and driven by predetermined target signals.
Tape roll radii on the respective reels are determined from the amount of tape movement, that is, rotation angles of the reels and a known tape thickness, and reel moments are determined from the tape roll radii to determine a total amount of tape wound on the reels, that is, a reel status amount.
During the tape transport, the tape roll radii and the reel moments change from time to time. Operation band widths or dynamic responses of the reel drive systems are equalized in accordance with the change of the tape roll radii and the reel moments so that the reel drive systems are cooperatively controlled.

REFERENCES:
patent: 3984868 (1976-10-01), Ragle et al.
patent: 4015799 (1977-04-01), Koski et al.
patent: 4121138 (1978-10-01), Flint et al.
patent: 4125881 (1978-11-01), Eige et al.
patent: 4172231 (1979-10-01), d'Alayer de Costemore
patent: 4338645 (1982-07-01), Mohri et al.
patent: 4398227 (1983-08-01), Anderson
patent: 4399355 (1983-08-01), Satoh et al.
patent: 4448368 (1984-05-01), Skalko
Thorpe, IBM Technical Disclosure Bulletin, vol. 15, No. 8, Jan. 1973, pp. 2603-2605.
Penny, ibid, vol. 14, No. 6, Nov. 1971, pp. 1863-1864.

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