Sprocket wheel and photo film advancing device

Details Sprocket wheel and photo film advancing device Sprocket wheel and photo film advancing device

1997-09-30

1999-02-23

Lee, Eddie C.

Photography

With film drive

Film movement limiting means

396397, 396401, 396411, G03B 100, G03B 1742

Patent

active

058753664

ABSTRACT:
Photo film (15) has pairs of perforations (21) arranged at a regular pitch (L1+L2). A photo film advancing device for advancing the photo film by the regular pitch (L1+L2) has a take-up spool (23), which winds the photo film after each exposure. A rotatable sprocket wheel (26, 68, 80, 83, 90) has a circular peripheral face (27, 71, 80c, 87, 93) with first and second teeth. The first (25a, 68a, 80a, 85b, 91a) and second teeth (25b, 68b, 80b, 85a, 91b) engage the respective perforations. A wind stop claw (36a) locks the sprocket wheel to prevent the photo film from advancing when the first and/or second perforation is engaged with the first and/or second tooth. The wind stop claw unlocks the sprocket wheel when a shutter (44) operates. While unlocked, the sprocket wheel is rotated a small amount by advancement of the photo film, to move the second tooth away from the second perforation. The peripheral face of the sprocket wheel frictionally contacts the photo film. Then the first tooth contacts the photo film to stand by to engage the succeeding first perforation. While the first tooth stands by, the photo film is advanced in contact with the first tooth.

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