Reel to reel tape radius measurement apparatus and method theref

Details Reel to reel tape radius measurement apparatus and method theref Reel to reel tape radius measurement apparatus and method theref

1988-04-19

1989-03-21

Ro, Bentsu

Electricity: motive power systems

With particular motor-driven load device

Tension-maintaining type of motor-control system

G11B 1532

Patent

active

048146730

ABSTRACT:
In a reel to reel tape transport system for determining the radii of the reel to reel tape by generating a series of forward and reverse pulses from a brushless DC motor driving the reel to reel tape, generating a forward series of pulses when said tape is turning in the forward direction and a reverse series of pulses when the tape is turning in the reverse direction, using a state machine to determine a forward or reverse revolution of the tape despite tape reversals before the completion of the revolution, and a counter and decoder for decoding the output of the state machine to provide an accurate determination of one revolution of the brushless DC motor.

REFERENCES:
patent: 4015799 (1977-04-01), Koski et al.
patent: 4115881 (1978-11-01), Eige et al.
patent: 4743811 (1988-05-01), Katayama
patent: 4777413 (1988-10-01), Yoshimura et al.

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