Cine film advancing system - uses parallelogram linkage pivoted at two corners with rollers at remaining corners to modulate film velocity

The film moves forward at constant velocity round drive rollers. At the picture gate a mechanism is provided which, during the projection (exposure) phase, moves the film back with an equal and opposite velocity, so holding it still in space; during the following dark phase this part of the film is...

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Bibliographic Details
Main Author MEHLITZ,DIETER
Format Patent
LanguageEnglish
German
Published 15.09.1977
Subjects
ACCESSORIES THEREFOR
APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM
CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:The film moves forward at constant velocity round drive rollers. At the picture gate a mechanism is provided which, during the projection (exposure) phase, moves the film back with an equal and opposite velocity, so holding it still in space; during the following dark phase this part of the film is moved on with increased speed. A suitable mechanism consists of a parallelogram in a vertical plane; it is pivoted at two of its adjacent corners and the film passes over rollers at the other two. When the parallelogram moves up, the film remains still at the picture gate; when down, the film is accelerated. The motion is controlled by a cam.
Bibliography:Application Number: DE19762610174