Orthogonal film drive

Details Orthogonal film drive Orthogonal film drive

1980-10-14

1982-05-25

Christian, Leonard D.

Advancing material of indeterminate length

By orbitally traveling material-engaging surface

With drive means

226 19, 226122, 355 95, B65H 1722, B65H 2526

Patent

active

043312756

ABSTRACT:
A high precision strip film drive, typically for microfiche film, that includes two spaced-apart drive rollers, separately driven by two servo electric motors. The motors are biased against each other and so maintain a constant tension on the film, while it is stationary or moving.
The motors are logic controlled through a pair of rotary encoders. Each encoder is driven by one roller. The outputs of the encoders are combined to give a single servo control signal, devoid of film squew, for accurately spacing the frames upon the microfiche.
The encoder electrical outputs are differently handled to provide film velocity information, and still further differently handled to provide direction of motion of the film information.
Transverse orthogonal motion of the film is provided by a carriage that supports the rollers, a linear encoder, and a cable system actuated by a third servo motor.
The encoder electrical outputs are even further differently handled to accurately finally position the film, as preselected.

REFERENCES:
patent: 3601487 (1971-08-01), Burton et al.
patent: 3767302 (1973-10-01), Roberts et al.
patent: 4175854 (1979-11-01), Ammann et al.
patent: 4235543 (1980-11-01), Norris

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