Sprocket mechanism for cameras

Details Sprocket mechanism for cameras Sprocket mechanism for cameras

1996-04-02

1997-05-27

Gray, David M.

Photography

With film drive

Film movement limiting means

396411, G03B 100

Patent

active

056341610

ABSTRACT:
A sprocket mechanism for cameras includes a sprocket consisted of a body and a raised annular portion, a positioning plate fitted onto the sprocket, and an electrical switch located near the positioning plate. The sprocket body has two opposite pairs of pawls spaced suitably apart, and the raised annular portion has two notches provided at predetermined positions. When the sprocket rotates through 180 degrees, the electrical switch is caused to be on or off. A motor is caused to stop after an electrical signal is detected. At the same time, it can be determined that a frame of the film has been advanced and precisely positioned, and a counter is provided to display the number of frames advanced.

REFERENCES:
patent: 5410380 (1995-04-01), Kawamura et al.

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