Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1992-06-22
1993-10-12
Stodola, Daniel P.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 718, G03B 1726
Patent
active
052518418
ABSTRACT:
A photographic film cassette has a spool with a photographic film wound in a roll thereon. When the spool is rotated in a film unwinding direction, a photographic film leader is caused to advance outward from a cassette shell. The spool is constituted of two spool pieces which are rotatably and slidably coupled together via a guide shaft formed on the spool piece and a sleeve formed on the other spool piece. Each spool piece has a flange and a core. A cam follower is formed on the guide shaft and a cam groove is formed in the sleeve to receive the cam follower. The spool is thereby lengthened and shortened when the spool pieces are rotated relative to each other. Accordingly, when the spool is rotated, the flanges tightly clamp the photographic film roll laterally. The cam groove is formed so as to be closed to a core end which is coupled to the other core. A recess is formed in the inside of the sleeve, and the recess is adapted to receiving the cam follower so as to allow insertion thereof into the cam groove. The cam follower extends to an end face of a core end of the spool piece, whereby the cam follower is resistant to fracture. A pair of tongues are formed respectively on the spool pieces, and are engaged together to transmit rotation of the one spool piece to the other eve if the cam follower is broken. A projection is formed on the first spool piece, to be received by a claw formed on the second spool piece. The spool pieces are thereby prevented from being taken apart in the axial direction.
REFERENCES:
patent: 4846418 (1989-07-01), Fairman
patent: 4887776 (1989-12-01), Niedospial, Jr. et al.
patent: 5031855 (1991-07-01), Wolf et al.
patent: 5040739 (1991-08-01), Wolf et al.
patent: 5046679 (1991-09-01), Wolf et al.
Naito Toshiharu
Takatori Tetsuya
Darling John P.
Fuji Photo Film Co. , Ltd.
Stodola Daniel P.
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