Varying frictional forces on a film advancing apparatus

Details Varying frictional forces on a film advancing apparatus Varying frictional forces on a film advancing apparatus

1979-03-02

1980-07-15

Hix, L. T.

354212, G03B 1752, G03B 108, G03B 132

Patent

active

042125243

ABSTRACT:
Photographic apparatus including an elongate member mounted for reciprocating movement between first and second positions for advancing an exposed film unit of the self-developing type between a pair of pressure-applying rollers. Initially, there is a loose fit between the elongate member and its mounting. As the elongate member is moved out of the first position it is canted thereby substantially increasing the sliding frictional forces between it and its mounting thus accurately locating a film unit engaging member in alignment with a trailing edge of an exposed film unit prior to moving it into engagement with the rollers. When the elongate member reaches the second position, the sliding frictional forces are substantially reduced thereby enabling a relatively weak spring to return the elongate member to the first position. Structure is provided for preventing movement of the elongate member back to the first position until it has reached the second position.

REFERENCES:
patent: 2873658 (1959-02-01), Land
patent: 3826655 (1974-07-01), Borel et al.
patent: 3967304 (1976-06-01), Johnson et al.
patent: 4068244 (1978-01-01), Douglas
patent: 4112469 (1978-10-01), Kindig et al.

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