Method and apparatus for automatically tracking a magnetic tape

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record

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36013021, G11B 1560

Patent

active

043630421

ABSTRACT:
In a magnetic tape-automatic tracking method, at least one of the positions of the upper and lower edges of a magnetic tape is detected by an assembly of a tape edge position sensor and light-emitting diode. Any displacement of the running magnetic tape from its standard vertical position is determined from detected data. A generally vertical tape edge position-compensating post which applies a tensile force to the magnetic tape in contact therewith is rotated in a vertical plane by a reversible motor in accordance with the detected extent of the displacement of the running magnetic tape from its standard vertical position. The magnitude of a tensile force applied by the tape edge position-compensating post to the magnetic tape is varied, by the extent of the rotation of the reversible motor. As a result, the magnetic tape is vertically moved in the desired direction to regain its standard vertical position.

REFERENCES:
patent: 3623042 (1971-11-01), Wohler et al.
patent: 3625076 (1971-12-01), Yamada
patent: 3893176 (1975-07-01), Jones
patent: 3943566 (1976-03-01), Brock et al.
IBM Tech. Disc. Bull., L. H. Everett, Lateral Position Detector for Moving Web, vol. 14, No. 6, Nov. 1971, p. 1834.

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