Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1988-04-22
1989-07-11
Levy, Stuart S.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 719, 242 73, 354275, G03B 1726
Patent
active
048464180
ABSTRACT:
In a 35 mm film cassette, the leading end of a film roll coiled about a film spool is located within the cassette shell. The film spool is comprised of two pieces constructed to telescopically receive one another. Each spool piece includes a radially extending flange normally disposed adjacent one of the opposite sides of the film roll. When the film spool is initially rotated in a film unwinding direction, a rotation-responsive cam device coupling the two spool pieces automatically moves one spool piece axially toward the other piece to cause the respective flanges to clamp the film roll at its opposite sides. As a result, the leading end of the film roll will be rotated past a stripper-guide which strips the leading end from between the flanges and guides it through a light-trapped opening in the cassette shell. Thus rotation of the film spool in the unwinding direction will advance the leading end to the outside of the film cassette.
REFERENCES:
patent: 2541476 (1951-02-01), Mihalyi
patent: 3556435 (1971-01-01), Wangerin
patent: 3659799 (1972-05-01), Cerutti et al.
patent: 4145133 (1979-03-01), Wareham
patent: 4407579 (1983-10-01), Huff
patent: 4445768 (1984-05-01), Gold
duBois Steven M.
Eastman Kodak Company
Fields Roger A.
Levy Stuart S.
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