4:3 perf conversion sprocket

Details 4:3 perf conversion sprocket 4:3 perf conversion sprocket

1989-05-26

1990-02-13

Bui, Thuy M.

Endless belt power transmission systems or components

Positive drive pulley or guide roll

352241, F16H 5502, G03C 302

Patent

active

049002937

ABSTRACT:
A sprocket assembly which allows a film projector or any other film handling device to be readily converted to run film which is either 4-perf or 3-perf. The sprocket assembly includes an outer cylindrical sleeve having teeth for engaging the film perforations when the film is run, and an inner cylindrical sleeve adapted to fit within and antirotationally mate with the outer cylindrical sleeve. The inner sleeve also has teeth for engaging the film perforations. The inner sleeve is mounted on a rotatable shaft of the projector, and the outer sleeve can be added or removed depending on whether the operator wishes to run 3-perf or 4-perf film. The outer and inner sleeves are sized such that when the outer sleeve is used, the film running rate is substantially 4/3 the rate when the inner sleeve alone is used.

REFERENCES:
patent: 1229275 (1917-06-01), Jenkins
patent: 3865738 (1975-02-01), Lente
"Three-perforation at Clairmont," American Cinematographer, Dec. 1988.
"Trilent 35 System," Image Technology, Jul. 1988.
"Kodak's Coleman on HDTV and the Future of Film", International Photographer, Oct. 1988, pp. 16-19.

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