Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1995-02-28
1996-11-19
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 742, G11B 1554, G11B 1567
Patent
active
055769055
ABSTRACT:
Air entrainment effects are avoided in a bi-directional, reel-to-reel tape transport in which magnetic tape can be moved in either of two opposing directions for data recording thereon. Control of tape position is implemented in a servo algorithm that uses tachometer inputs to determine parameter values for generating reel motor drive currents. A fine-line tachometer is mounted on each of two reels in the tape drive and multiplexing selects the fine-line output from the tachometer on the reel supplying tape for use in the servo algorithm. At least one of the tachometers is preferably of the type which generates an index line once each revolution of the motor to which it is mounted. This tachometer is coupled to the reel to which the tape is initially threaded and the index line is used to indicate that the motor is at a predetermined threading position for this operation.
REFERENCES:
patent: 3834648 (1974-09-01), Rose, Jr. et al.
patent: 3854676 (1974-12-01), Fischer et al.
patent: 3900732 (1975-08-01), Costales
patent: 3913866 (1975-10-01), Hankins
patent: 4015799 (1977-04-01), Koski et al.
patent: 4102028 (1978-07-01), Currie
patent: 4125881 (1978-11-01), Eige et al.
patent: 4234899 (1980-11-01), Feldstein et al.
patent: 4295171 (1981-10-01), Hirota et al.
patent: 4333115 (1982-06-01), Junio
patent: 4335411 (1982-06-01), Dischert
patent: 4343992 (1982-08-01), Blaser
patent: 4370683 (1983-01-01), Greig et al.
patent: 4398227 (1983-08-01), Anderson
patent: 4479159 (1984-10-01), Kamei et al.
patent: 4739950 (1988-04-01), Goker et al.
patent: 4776528 (1988-10-01), West
patent: 4794250 (1988-12-01), Togami
patent: 4809099 (1989-02-01), Murphy et al.
patent: 4866547 (1989-09-01), Rodal et al.
patent: 4953044 (1990-08-01), Van Pelt et al.
patent: 5085379 (1992-02-01), Uchikoshi et al.
patent: 5229895 (1993-07-01), Schwarz et al.
J. A. Weidenhammer, "Electrical Differential Tape Drive System," IBM Technical Disclosure Bulletin, vol. 12, No. 11, Apr. 1970, p. 1805.
L. R. Beach and C. H. Kalthoff, "Reel-to-Reel Tape Transport," IBM Technical Disclosure Bulletin, vol. 15, No. 1, Jun. 1972, pp. 121-122.
Garcia Joe L.
Hu Paul Y.
Koski John A.
Habermehl James L.
International Business Machines - Corporation
Psitos Aristotelis
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