Film cassette

Details Film cassette Film cassette

1989-03-08

1990-02-13

Levy, Stuart S.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 718, 354275, G03B 1726

Patent

active

048999482

ABSTRACT:
A film cassette is disclosed wherein a film spool is rotatable within the cassette shell in film unwinding and rewinding directions, a convoluted film roll whose outermost convolution is a film leader is coiled about the spool, a pair of film constraining flanges are coaxially arrnaged 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 the 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 the flim unwinding direction. According to the invention, the cassette shell and the film leader include mutual engagement means for securing the leader substantially proximate its leading end responsive to rotation of the spool in the film rewinding direction to prevent the leading end from coming to rest between the stripper-guide and the next-inward convolution. If, conversely, the leading end was stored between the stripper-guide and the next-inward convolution, the film leader might develop an inward curl sufficient to keep it of range of the stripper-guide.

REFERENCES:
patent: 4176938 (1979-12-01), Weiss et al.

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