Control mechanism for the pull-down pawl of a film projector

Details Control mechanism for the pull-down pawl of a film projector Control mechanism for the pull-down pawl of a film projector

1977-01-11

1978-06-13

Hayes, Monroe H.

Optics: motion pictures

Camera and/or projector drive mechanisms

With speed regulation or selection

352194, 226 62, G03B 2148

Patent

active

040945952

ABSTRACT:
A control mechanism for the pull-down pawl of a projector, for the projection of films with different frame frequencies, comprises a pot-shaped worm gear and a control drum coaxial with and connected thereto for rotation therewith, movable in axial direction relative thereto and arrestable against a force of biasing means in one of a plurality of selected positions. The control drum is provided on its periphery with a plurality of different cam curves and a pin, movable in a direction normal to the axis of the control drum, engages with one a cam curve, brought in a selected position of the drum in alignment therewith, while the other end of the pin cooperates with a pull-down pawl to move an end of the latter into and out of perforations of the film. The worm gear meshes with a worm driven by a shaft carrying a cam engaged by a cam follower connected to the pull-down pawl to move the latter along a feed stroke when the end of the pull-down pawl is engaged in one of the film perforations.

REFERENCES:
patent: 3181174 (1965-04-01), Griffioen
patent: 3402007 (1968-09-01), Gerlach
patent: 3502403 (1970-03-01), Riedel
patent: 3536389 (1970-10-01), Reinsch
patent: 3984181 (1976-10-01), Nowak

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