Camera with film take-up confirming mechanism

Details Camera with film take-up confirming mechanism Camera with film take-up confirming mechanism

1987-01-12

1988-01-26

Mathews, A. A.

354212, 354268, 3542891, G03B 104, G03B 1718, G03B 1738

Patent

active

047219734

ABSTRACT:
A photographic camera, when loaded with a film cartridge containing a perforated filmstrip, warns the user of a film take-up malfunction by preventing manual actuation of the shutter release and, when not loaded with the cartridge, permits manual actuation of the shutter release to test-operate the camera. In the camera, a blocking member is urged to move from a non-blocking position with respect to a shutter release to a blocking position preventing manual actuation of the shutter release. A cartridge sensing member is urged to hold the blocking member in its non-blocking position, when a film cartridge is not loaded in the camera, to permit manual actuation of the shutter release for test-operation purposes. When the film cartridge is loaded in the camera, the cartridge sensing member is moved to release the blocking member for movement to its blocking position. A film motion detecting sprocket engageable with successive perforations in the filmstrip is rotated in a predetermined direction in response to advancement of the filmstrip as it is wound onto a take-up spool. The sprocket is coupled with the blocking member, preferably in coaxial relation, to pivot the blocking member back to its non-blocking position when the sprocket is rotated initially in the predetermined direction. If the sprocket is not rotated in the predetermined direction, the blocking member remains in its blocking position, thereby warning the user of a film take-up malfunction by preventing manual actuation of the shutter release.

REFERENCES:
patent: 3470799 (1965-01-01), Englemann
patent: 3608459 (1971-09-01), Ettischer et al.
patent: 3665830 (1972-05-01), Maeda
patent: 4174168 (1979-11-01), Yamashita
patent: 4334753 (1982-06-01), Harvey
patent: 4340291 (1982-07-01), Berg
patent: 4344753 (1987-08-01), Shelley et al.

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