Film cassette

Details Film cassette Film cassette

1989-03-08

1989-12-19

Levy, Stuart S.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 718, 354275, G03B 1726

Patent

active

048877760

ABSTRACT:
A film cassette is disclosed wherein a spool includes two coaxial core pieces having a convoluted film roll coiled about them, whose outermost convolution is a film leader, and respective flanges fixed to the core pieces which radially extend over the opposite sides of the film roll. At least one of the core pieces is supported for movement axially toward the other one to move at least one of the flanges axially toward the other one to provide axial clamping forces at the opposite sides of the film roll. A film stripper-guide is received between the outermost convolution and the next-inward convolution of the film roll to strip the outermost convolution from the flanges and guide it through a film passageway to the exterior of the cassette shell responsive to rotation of the spool in a film unwinding direction during application of the axial clamping forces. According to the invention, at least one of the flanges includes integral means for concentrating the axial clamping forces substantially at the outermost convolution of the film roll and preventing application of the axial clamping forces substantially at the more-inward convolutions of the film roll.

REFERENCES:
patent: 988341 (1911-04-01), Hill
patent: 2541476 (1951-02-01), Mihalyi
patent: 3234024 (1966-02-01), Leinonen
patent: 3556435 (1971-01-01), Wangerin
patent: 3659799 (1972-05-01), Ceruhi et al.
patent: 3677499 (1972-07-01), Wangerin
patent: 3797777 (1974-03-01), Hosono et al.
patent: 3856228 (1974-12-01), Hosono et al.
patent: 4407579 (1983-10-01), Huff
patent: 4423943 (1984-01-01), Gold
patent: 4488796 (1984-12-01), Edwards

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