Method and apparatus for maintaining tape tension in a belt-driv

Details Method and apparatus for maintaining tape tension in a belt-driv Method and apparatus for maintaining tape tension in a belt-driv

1991-10-15

1993-11-23

Zazworsky, John

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 71, 360 723, G11B 1546, G11B 1543

Patent

active

052649725

ABSTRACT:
In a belt-driven tape cartridge of the type used to store data on a magnetic tape in a high speed data storage and retrieval system, the tape must be maintained at a proper tension within the cartridge so as to maintain the tape taut against the write/read head. Slackness in the tape occurs after a repeated number of changes in the tape transport direction or start/stop events, because the tension experienced by the tape is not the same in both transport directions. In a belt-driven cartridge, the tape tension cannot be directly monitored. A method and apparatus for maintaining tape tension in a belt-driven cartridge are disclosed wherein tape tension is indirectly monitored by non-mechanically monitoring a selected tape characteristic, the characteristic changing as the tape tension changes. If the monitored char,, exceeds a predetermined value, or after the passage of a selected amount of time, when the next reversal of tape transport direction occurs, the tape is moved a selected distance longer than necessary to effect the reversal so that when a desired data location on the tape reaches the location of the write/read head, the tape will again be at the proper tension.

REFERENCES:
patent: 4095732 (1978-06-01), Merritt
patent: 4335411 (1982-06-01), Dischert
patent: 4341363 (1982-07-01), Inatome
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patent: 4557434 (1985-12-01), Williams
patent: 4701814 (1987-10-01), Westall
patent: 4821129 (1989-04-01), Culp
patent: 5130866 (1992-07-01), Klaassen et al.
patent: 5150263 (1992-09-01), Sakamoto et al.
3M Field Bulletin Data Cartridges, No. 28, pp. 58-59, Nov. 7, 1990.

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