The Rolling Loop — A New Concept of Film Transport

A completely new approach to film transport involves continuous feeding of film into a series of loops which are accommodated in gaps formed in a continuously moving rotor carrying them through the system. There are no reciprocating, oscillating or intermittently moving parts. The three members involved, the rotor and two feed sprockets, revolve at the same constant speed. No intermittent motion is imparted to the film although this is stationary and fully registered on fixed pins at the aperture during exposure. Considerable design flexibility is available and frame transition (equivalent pulldown period) may be varied and reduced to a substantially lower value than usual. A 35mm version has been run at above 300 frames/s; this may be improved upon. The geometry of the mechanism permits the simultaneous registration of parts of two successive frames in the aperture; this is useful in television film recording because it obviates fast film-frame transition.

Print ISSN

0361-4573

Published

1968-01

Content type

Original Research

DOI

10.5594/J05867