Method for feeding film

Details Method for feeding film Method for feeding film

1986-09-17

1988-01-12

Jillions, John M.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

G03B 104

Patent

active

047186186

ABSTRACT:
In a film reader system in which a film provided with a leader film having a width wider than the width of end flanges of a reel around which the film is wound is wound up around another reel, when a wind-back motor is driven at high speed to wind back around the first mentioned wind-back reel, the leader film is detected by a pair of pinch rollers on the way of the film travelling. Upon the detection, the wind-back motor is electrically braked and the wind-up motor is reversely driven at high speed in the film wind-back direction to release the leader film from the wind-back reel. The wind-back and wind-up motors are then driven in synchronized manner at low speed in the film wind-back direction and the wind-back motor is again driven at high speed upon the detection of the leader film passing the detecting pinch rollers.

REFERENCES:
patent: 3217996 (1965-11-01), Bernier
patent: 3675877 (1972-07-01), Rempala
patent: 3885756 (1975-05-01), Uehara et al.
patent: 4076400 (1978-02-01), Persha et al.
patent: 4432509 (1984-02-01), Shirai et al.

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