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Tape Drive Tension Control

IP.com Disclosure Number: IPCOM000041665D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Winarski, DJ: AUTHOR

Abstract

A drive tension look-up matrix will lessen excessive tape tension at the magnetic head in a tape drive. Two functions are checked to adjust the tape tension. One function is the direction of the medium, the other function is the medium's velocity. Head wear and tape path drag can be compensated for by the adjustment of the drive tension at different operations of the system. A high tension is needed only during a read/write operation. Thus at a lower velocity, the tension is adjusted to be lower than at operational speed. Further, the drag on the magnetic tape is different whether the tape is going in a forward or a reverse direction. The drag on the tape is subtractive in one direction and additive in the opposite direction.

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Tape Drive Tension Control

A drive tension look-up matrix will lessen excessive tape tension at the magnetic head in a tape drive. Two functions are checked to adjust the tape tension. One function is the direction of the medium, the other function is the medium's velocity. Head wear and tape path drag can be compensated for by the adjustment of the drive tension at different operations of the system. A high tension is needed only during a read/write operation. Thus at a lower velocity, the tension is adjusted to be lower than at operational speed. Further, the drag on the magnetic tape is different whether the tape is going in a forward or a reverse direction. The drag on the tape is subtractive in one direction and additive in the opposite direction. If the drive controls tape tension to a constant value at a tension transducer, the tape tension at the magnetic head will be unnecessarily high when the tape is traveling to the magnetic head from the tape tension transducer. A drive tension table look-up lessens excessive tape tension at the magnetic head by adjusting the tension as a result of the direction of the medium and the medium velocity. The direction of the medium is sensed and the tape tension transducer and servo compensate for drag on the tape to create the required tension at the head. Further, when the medium is standing still or just starting or stopping, the tension is lowered to permit a faster start time and lower wear on the magnetic head.

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