Method of determining tape length and tape pack position of a ta

Details Method of determining tape length and tape pack position of a ta Method of determining tape length and tape pack position of a ta

1992-12-31

1994-06-21

Wolff, John H.

Dynamic magnetic information storage or retrieval

Miscellaneous

G11B 1502

Patent

active

053232860

ABSTRACT:
A method of determining the position of a tape in a tape cartridge having a first hub, a second hub, a means for measuring the rotation of the first hub, a means for measuring the rotation of the second hub, and a length of tape with one end of the tape wrapped around the first hub and the other tape end wrapped around the second hub, the tape having a relatively uniform and predetermined thickness and the hubs having predetermined diameters. In accordance with the method, the first hub is locked to prevent rotation of the first hub. A length of tape is then extracted from the cartridge, which causes the second hub to rotate as tape is unwound from the second hub. There is then determined the angle rotated by the second hub in response to the length of tape being unwound from the second hub. The first hub is unlocked and the second hub is locked. The length of tape unwound from the second hub is wound onto the first hub, and there is determined the angle rotated by the first hub in response to the length of tape being wound onto the first hub. Finally, the position of the tape in the tape cartridge is calculated based on the predetermined thickness of the tape, the predetermined diameters of the empty hubs, and the angle of rotations determined for the second hub and for the first hub.

REFERENCES:
patent: 4805054 (1989-02-01), Kamoto et al.
patent: 4989107 (1991-01-01), Tsukahara
patent: 5018040 (1991-05-01), Nishida
patent: 5146380 (1992-09-01), Fujii et al.
patent: 5150265 (1992-09-01), Tanaka

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