Photographic film cassette

Details Photographic film cassette Photographic film cassette

1992-04-09

1994-02-01

Will, Thomas B.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 719, 354275, G03B 1726

Patent

active

052825850

ABSTRACT:
A photographic film cassette has a spool for winding photographic film in a roll. A film leader is caused to advance outward from a cassette shell through a film passageway, when the spool rotates in an unwinding direction. A circumferential lip is formed around a first spool flange, projects toward the roll, and has a bevelled face for contact with a first lateral edge of the film along outer turns. A cam mechanism associated with two spool pieces shortens the spool while rotating the spool in the unwinding direction, and lengthens the spool while rotating the spool in the wind-up direction. When shortened, an interval between two flanges is reduced enough to firmly clamp lateral sides of the roll between the flanges. When lengthened, the flange interval is enlarged enough to release the lateral sides from the clamping force. The film is wound up without lateral flexure.

REFERENCES:
patent: 4407579 (1983-10-01), Huff
patent: 4832275 (1989-05-01), Robertson
patent: 4846418 (1989-07-01), Fairman
patent: 4887776 (1989-12-01), Niedospial, Jr. et al.
patent: 4908641 (1990-03-01), Fairman
patent: 4991786 (1991-02-01), Cloutier et al.
patent: 5040739 (1991-08-01), Wolf et al.

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