Light shield for closing the film slot of a film cartridge

Details Light shield for closing the film slot of a film cartridge Light shield for closing the film slot of a film cartridge

1995-06-02

1996-10-01

Jillions, John M.

Winding, tensioning, or guiding

Unwinding and rewinding a machine convertible information...

Cartridge system

G03B 1726

Patent

active

055605630

ABSTRACT:
A light shield (40, 100) for closing the film slot (33) in a film cartridge (20) is configured as a light shielding strip (40, 100) which extends around a film strip (26) coiled on a supply spool (25) within the film cartridge (20). The light shielding strip (40, 100) has a first end portion (44, 102) for covering the film slot (33) and a second end portion (54) for engagement by the film lead (56) of the film strip (26). When the film strip (26) is initially advanced, detents (64) on the light shielding strip (26) are engaged temporarily by teeth (66) on the supply spool (25) to pull the light shielding strip (26) open so that the film strip (26) projects from the cartridge (20). Upon rewinding the film strip (26), a film lead portion (56) of the film strip (26) engages other detents (72, 142) on the light shielding strip (40, 100) to push the light shielding strip (40, 100) back over the film slot (33) to thereby again close the film slot (33).

REFERENCES:
patent: 3645434 (1972-02-01), Rab
patent: 4482232 (1984-11-01), Engelsmann et al.
patent: 5200777 (1993-04-01), Zander
patent: 5209419 (1993-05-01), Zander
patent: 5319407 (1994-06-01), Dirisio
patent: 5357303 (1994-10-01), Wirt

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