Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1989-01-12
1989-10-24
Levy, Stuart S.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
354275, G03B 1726
Patent
active
048756377
ABSTRACT:
A film cassette is disclosed wherein a film spool having a filmstrip coiled about it is rotatable in an unwinding direction to automatically advance a leader portion of the filmstrip along a film passage slit to the outside of the cassette shell, preparatory to initial film exposure, and is rotatable in a rewinding direction to wind the leader portion to the inside of the shell, following complete film exposure, at least until a leading end of the leader portion is positioned inward of the slit. The cassette shell includes first integral guide means, protruding from an inner circumferential wall of the shell to a predetermined location proximate the film passage slit and an outermost convolution of the filmstrip, for guiding the leading end of the leader portion between the inner wall and the outermost convolution to prevent the leading end from entering the slit. Second integral guide means is formed at the inner wall of the cassette shell for guiding the leading end of the leader portion directly to the first integral guide means in response to rotation of the film spool in the unwinding direction anytime after the leading end has been wound inward of the film passage slit. Thus, the leading end of the leader portion can be prevented from entering the film passage slit when the filmstrip is completely exposed, thereby avoiding the possibility of re-exposing the filmstrip.
REFERENCES:
patent: 3695160 (1972-10-01), Stockdale
patent: 4148449 (1979-04-01), Kluczynski
patent: 4200247 (1980-04-01), Kluczynsti et al.
patent: 4335948 (1982-06-01), Cocco
patent: 4407579 (1983-10-01), Huff
patent: 4423943 (1984-01-01), Gold
patent: 4445768 (1984-05-01), Gold
patent: 4482232 (1984-11-01), Englesmann et al.
duBois Steven M.
Eastman Kodak Company
Fields Roger A.
Levy Stuart S.
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