Film initial-advance apparatus for camera

Details Film initial-advance apparatus for camera Film initial-advance apparatus for camera

1990-09-14

1992-08-04

Adams, Russell E.

354212, G03B 118, G03B 100

Patent

active

051363135

ABSTRACT:
A film initial-advance apparatus advances, after a film cassette is loaded, a film leader portion protruding from the film cassette toward a film take-up spool. A drive lever moves as the film take-up spool rotates. The drive lever causes a film threading member to reciprocally and intermittently move along a film passageway. The film threading member engages with a perforation of the film leader portion to intermittently advance the film leader portion. When the film leader portion is fully captured by the film take-up spool, the drive lever is pushed outside in the axial direction of the film take-up spool by the side edge of the film leader portion, thereby disengaging the drive lever from the film take-up spool. The film threading member rotates while moving in the radial direction, having a large radius of rotation of the claw over the range wherein it engages a perforation of the film leader portion and a smaller radius elsewhere.

REFERENCES:
patent: 4397535 (1983-08-01), Harvey
patent: 4416525 (1983-11-01), Chan
patent: 4505562 (1985-03-01), Hara et al.
patent: 4564279 (1986-01-01), Sitzler et al.

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