Photography – Camera detail – Camera element cocking or resetting
Patent
1996-10-23
1997-10-28
Blankenship, Howard B.
Photography
Camera detail
Camera element cocking or resetting
G03B 1742
Patent
active
056825692
ABSTRACT:
A shutter charge device is used with photo film and charges a shutter device. The photo film includes plural groups of perforations formed along one edge thereof. The groups are arranged at the predetermined pitch of the frames. Each of the groups includes two perforations disposed closely to one another at a predetermined distance. A driven sprocket wheel is meshed intermittently with the perforations in the photo film, and rotated by a predetermined amount while the photo film is wound as long as one of the frames. A rotatable member is rotated in integral fashion with the sprocket wheel by the predetermined amount, and charges the shutter device. A retainer lever is engaged with the rotatable member rotated by the predetermined amount, and locks the sprocket wheel to block movement of the photo film. The retainer lever is disengaged from the rotatable member upon releasing of the shutter device, and unlocks the sprocket wheel to allow it to rotate. A frame counter wheel is stepped one by one when the rotatable member is rotated by the predetermined amount, and indicates a number representing exposed ones of the frames. A disabling projection is operated by winding of the photo film after creating the frames of the predetermined number, and blocks rotation of the sprocket wheel upon disengagement of the sprocket wheel from the perforations, whereby no further exposure is taken on the photo film.
REFERENCES:
patent: 5581316 (1996-12-01), Kamoda et al.
Blankenship Howard B.
Fuji Photo Film Co. , Ltd.
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