Film cassette

Details Film cassette Film cassette

1989-03-08

1989-11-28

Levy, Stuart S.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 718, 242 719, 354275, G03B 1726

Patent

active

048832367

ABSTRACT:
A film cassette is disclosed wherein a spool having a convoluted film roll coiled about it, whose outermost convolution is a film leader, includes two coaxial core pieces adapted to telescopically receive one another and respective flanges fixed to the core pieces which radially cover the opposite sides of the film roll. When the spool is initially rotated in a film unwinding direction, rotation responsive means moves at least one of the core pieces axially toward the other one to cause the flanges to clamp the film roll at its opposite sides 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. The film leader and at least one of the flanges are adapted for mutual engagement to secure the leading end of the leader 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 during rotation of the film roll in the film unwinding direction. Biasing means urges one of the core pieces axially toward the other one to urge one of the flanges axially into contact with the film leader to maintain the two mutually engaged.

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

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