Method of detecting tape edge

Details Method of detecting tape edge Method of detecting tape edge

1989-10-10

1992-05-05

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7802, 360 7712, G11B 556

Patent

active

051113473

ABSTRACT:
A method of detecting an edge of a magnetic tape, using a magnetic head device with a magnetic head capable of reading after writing and having a read gap and a write gap, and a switch for selectively electrically connecting the write gap to a write circuit and a read circuit. The steps of the method are: running the tape while moving the magnetic head from a predetermined initial position in the widthwise of the tape until the magnetic head reaches the edge of the tape to record a signal on the tape; subsequently rewinding the tape to the predetermined initial position to return the magnetic head to a position of the tape where the signal has been recorded; subsequently, under the condition of electrically connecting the write gap to the read circuit to cause the write gap to serve as a read gap, running the tape while causing the magnetic head to follow the signal recorded on the tape to read the signal; and subsequently comparing the read signal with a reference value to detect the edge of the tape.

REFERENCES:
patent: 4476503 (1984-10-01), Solhjell
patent: 4786984 (1988-11-01), Seeman
patent: 4802030 (1989-01-01), Henry et al.

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