Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1988-03-25
1989-08-29
Levy, Stuart S.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
354275, G03B 1726
Patent
active
048609668
ABSTRACT:
In a film cassette, a convoluted film roll is wound on a spool between a pair of coaxially spaced flanges of the spool. A plurality of rigid constraining projections fixed to the respective undersides of the flanges radially confine the outermost convolution of a widened film leader to prevent the film roll from radially expanding into contact with the cassette shell. The constraining projections are each arranged in a slipping relation with the outermost convolution of the widened leader to allow the outermost convolution to readily slide in contact with the constraining projections in order to facilitate a limited degree of radial expansion of the film roll. When the spool is rotated in an unwinding direction, the film roll will tend to expand radially since the inner end of the filmstrip is attached to the spool, and the spool will rotate the film roll in the unwinding direction. Successive sections of the outermost convolution of the widened leader will therefore be advanced past a stripper-guide which frees the leader sections from the radial confinement of respective ones of the constraining projections and guides the freed sections out of a cassette opening.
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: 3797777 (1974-03-01), Hosono et al.
patent: 4407579 (1983-10-01), Huff
patent: 4423943 (1984-01-01), Gold
patent: 4488796 (1984-12-01), Edwards
duBois Steven M.
Eastman Kodak Company
Fields Roger A.
Levy Stuart S.
LandOfFree
Film cassette does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Film cassette, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Film cassette will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2232716