Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1989-03-08
1989-11-28
Levy, Stuart S.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
354275, G03B 1726
Patent
active
048832359
ABSTRACT:
A film cassette is disclosed wherein a film spool is rotatable within the cassette shell, a convoluted film roll whose outermost convolution is a film leader is coiled about the spool, a pair of film constraining flanges are coaxially arranged on the spool to radially confine the film leader to prevent the leader from substantially contacting an interior wall of the cassette shell, and a film stripper-guide is received between a leading end of the film leader and the next-inward convolution of the film roll succeeding the leader to remove the leader 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. According to the invention, the film leader and at least one of the constraining flanges include mutual engagement means for maintaining the leading end of the leader spaced at least a minimum radial distance from the next-inward convolution sufficient to locate the leading end within range of the stripper-guide to ensure that the leading end will be advanced over the stripper-guide responsive to rotation of the spool in the film unwinding direction, whereby the leading end is prevented from being advanced between the stripper-guide and the next-inward convolution.
REFERENCES:
patent: 988341 (1911-04-01), Hill
patent: 2541476 (1951-02-01), Mihalyi
patent: 3234024 (1966-02-01), Leinonen
patent: 3659799 (1972-05-01), Cerutti et al.
patent: 3677499 (1972-07-01), Wangerin
patent: 3695160 (1972-10-01), Stockdale
patent: 3797777 (1974-03-01), Hosono et al.
patent: 4423943 (1984-01-01), Gold
patent: 4488796 (1984-12-01), Edwards
duBois Steven M.
Eastman Kodak Company
Fields Roger A.
Levy Stuart S.
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