Erasing apparatus

Details Erasing apparatus Erasing apparatus

1992-04-16

1993-12-14

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361267, 361149, 335284, H01F 1300

Patent

active

052708993

ABSTRACT:
An apparatus for erasing information recorded on a magnetic tape wound into a roll having a diameter. The apparatus comprises an erasing coil wound in the form of a solenoid defining a space therein. The space has a width shorter than the diameter of the magnetic tape roll and a length longer than the diameter of the magnetic tape roll. The magnetic tape roll is moved intermittently to different erasing positions in a predetermined sequence so that the magnetic tape roll has different portions placed in the space at the respective erasing positions. A ringing signal is applied to the erasing coil to provide a magnetic field in the space for erasing information recorded on the magnetic tape roll each time the magnetic tape roll is placed at one of the erasing positions.

REFERENCES:
patent: 3506884 (1970-04-01), McKinley
patent: 4470094 (1984-09-01), Armond et al.
patent: 4551782 (1985-11-01), Seely et al.
patent: 4672345 (1987-06-01), Littwin et al.
patent: 4730230 (1988-03-01), Helfrick
patent: 4897759 (1990-01-01), Becker

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