Metering control mechanism
AssigneeEastman Kodak Company
InventorDonald M. Harvey
Life of this patent
Estimating the term…
Abstract
An expose-on rewind type camera is used with a film cassette having a film spool which can be rotated to unwind a filmstrip off the spool to thrust a non-protruding film leader to the exterior of the cassette, to enable the filmstrip to be prewound continuously onto a take-up spool in the camera, and alternatively to rewind the filmstrip into the cassette a single frame increment following each exposure in the camera. During the prewind mode of the camera, a metering pawl is retained out of the way of the filmstrip to prevent the pawl from engaging the filmstrip at any of its metering perforations. The metering pawl is allowed to contact the filmstrip in response to change-over from the prewind mode to the rewind mode of the camera, to permit the pawl to meter the filmstrip a single frame increment preparatory to each exposure.
Claims5
A metering control mechanism for a photographic camera to be used with a film cassette in which a film spool is rotatable to unwind a filmstrip off the spool to thrust a non-protruding leader portion of the filmstrip from the cassette, to enable the leader portion to be moved along a film path to film take-up means in the camera, and alternatively to rewind the filmstrip onto the spool to draw the leader portion along the same path back into the cassette, wherein the camera includes a motorized film drive apparatus operable in a prewind mode for rotating the film spool to unwind the filmstrip off the spool and in a rewind mode for rotating the film spool to rewind the filmstrip onto the spool, characterized in that said metering control mechanism comprises:
- a metering pawl adapted to engage the filmstrip at respective metering perforations preparatory to each exposure;
- actuation means for moving said metering pawl into the film path to permit the pawl to engage the filmstrip at one of its metering perforations;
- and
- control means responsive to operation of said film drive apparatus in the prewind mode for removing said metering pawl from the film path to prevent the pawl from engaging the filmstrip at one of its metering perforations, and responsive to operation of said film drive apparatus in the rewind mode for allowing said metering pawl to be moved into the film path to permit the pawl to engage the filmstrip at one of its metering perforations.
Dependencies are inferred from the claim text.