Photography – With film drive – Film movement limiting means
Patent
1995-09-08
1996-12-17
Gray, David M.
Photography
With film drive
Film movement limiting means
396397, G03B 100
Patent
active
055858775
ABSTRACT:
A sprocket mechanism for cameras adapted for advancing a film provided with two juxtaposed sprocket holes at regular space intervals includes a sprocket with a body having a couple of pawls spaced apart at a pre-determined distance at a circumferential rim thereof and a first gear disposed on a top side of the body and having a notch at a suitable position thereof, a transmission gear having a second gear formed on its top side, the second gear having a shaft extending from a bottom side thereof and being inserted into a central hole of the first gear, the shaft capable of free movement within the central hole and having a stop element fitted thereon, the stop element being provided with a vertical segment at an extreme end thereof to be retained in the notch of the first gear. When the pawls of the sprocket engage the sprocket holes of the film, the sprocket, the transmission gear and the stop element rotate synchronously. After the sprocket has rotated through a certain angle, the pawls will come into contact with the film and the stop element will absorb the transmitted rotational speed to ensure the positioning of a single frame of the film.
REFERENCES:
patent: 4780734 (1988-10-01), Ogawa et al.
patent: 5298930 (1994-03-01), Asakura et al.
patent: 5453808 (1995-09-01), Zawodny et al.
patent: 5508770 (1996-04-01), Lawther
Huang Yeou-Fu
Lin Jong-Shing
Gray David M.
Sinpo Optical Co., Ltd.
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