Wind-up interlock for a single lens reflex camera

Claim 1

In a single lens reflex camera having a shutter mechanism, a film winding mechanism that prior to triggering of a picturetaking operation in which the shutter mechanism is opened and closed provides for advancing film into position to be exposed, a mirror actuating member, and a diaphragm actuating member with each actuating member being movable between picture-composing and picture-taking positions, the combination comprising: means for moving the actuating members through said positions in a cycle in the course of the picture-taking operation, said means including a driving member having a starting position at which prior to said triggering it is releasably stopped from moving and from which thereafter it is movable in a first direction to drive the actuating members from their picturecomposing positions to their picture-taking positions, the driving member being movable in a second, opposite direction so as to return to the starting position upon completion of the return of the actuating members to their picture-composing positions; a multi-position member movable from first to second positions when the shutter mechanism is triggered, and biasing means acting against the multi-position member for urging it to return to the first position; means on the multi-position member for releasably engaging the driving member while the multi-position member is in the first position so as to stop the driving member from moving until said triggering; means on the driving member for releasably engaging the multiposition member while the multi-position member is in the second position so as to retain it there throughout the time the driving member is moving in the second direction and to release it upon completion of said return of the actuating members; and means connected to the multi-position member for interlocking the film winding mechanism while the multi-position member is in the second position so that the film cannot be advanced until the completion of said return of the actuating members permits the multi-position member to be released and thereby be urged to return to the first position.