Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1986-10-14
1988-11-22
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
318 7, 242 7544, G11B 1543, B65H 5938
Patent
active
047869925
ABSTRACT:
The invention relates to a tape transport mechanism in which two reels are respectively driven by different motors, thereby transporting a magnetic tape from one reel to another reel by passing through the portion of a read/write head without any variation in tension. At the initial stage to transport the magnetic tape, an acceleration time from a stop state of the tape until a tape speed reaches a reference speed and an average tension deviation to be applied to the magnetic tape during this time are obtained. Correction values to correct variations in run characteristics of two reel drive systems are calculated by use of the acceleration time and the average tension deviation. Upon next and the subsequent magnetic tape transport, currents to be supplied to the motors to drive two reels are controlled by use of the drive current command values corrected by those correction values.
REFERENCES:
patent: 3606201 (1971-09-01), Petusky
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patent: 3809335 (1974-05-01), Mantey
patent: 4125881 (1978-11-01), Eige et al.
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patent: 4525654 (1985-06-01), Tajima et al.
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Ichikawa Atsushi
Kanna Munetake
Maejima Hiroshi
Tajima Fujio
Cardillo Raymond F.
Hitachi , Ltd.
Robertson David L.
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