Magnetic tape wind-up control method, and tape wind-up apparatus

Details Magnetic tape wind-up control method, and tape wind-up apparatus Magnetic tape wind-up control method, and tape wind-up apparatus

1989-07-03

1990-12-11

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

242186, G11B 1546

Patent

active

049774662

ABSTRACT:
A magnetic tape wind-up control method comprises the steps of controlling the speed, at which a feed motor is rotated, in accordance with a signal generated by a tape movement detector, and controlling the speed, at which a wind-up motor is rotated, in accordance with a signal which represents the position of a dancing arm, which thereby controls the tension on the magnetic tape. The number of revolutions completed by the wind-up motor is detected, and the outer diameter of a roll of magnetic tape, which is being wound around a wind-up reel, is calculated from the thickness of the magnetic tape, the diameter of a core of the wind-up reel, and the number of revolutions completed by the wind-up motor. The value indicated by a tape speed command is divided by the outer diameter of the roll of the magnetic tape. A rotation speed command signal, which represents the quotient of this division, is generated, and the speed of rotation of the wind-up motor is controlled on the basis of the rotation speed command signal. Simultaneously, the tension on the magnetic tape is controlled on the basis of the position of the dancing arm.

REFERENCES:
patent: 4561608 (1985-12-01), O'Gwynn
patent: 4786992 (1988-11-01), Tajima

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