Photograhic film cassette
AssigneeFuji Photo Film Co., Ltd.
InventorHideaki Kataoka
Life of this patent
Estimating the term…
Abstract
A photographic film cassette has a core on which a photographic filmstrip is wound, a cassette shell rotatably houses the core. A pair of disks are loosly fitted to the core, and the disks are engaged with the cassette so as to prevent rotation of the disks with the core. Each disk is formed with a circumferential lip for engagement with two opposite sides of the outermost convolution of a film roll wound on the core. A notch is formed in each circumferential lip. As the film roll rotates with the core, the film leader separated form the film roll passes through the notches. The film leader passed through the notches is then advanced out of the cassette via a film passage slit.
Claims9
A photographic film cassette comprising:
- a cassette shell having a film passage slit formed thereon;
- a core on which a film roll is coiled, said core being contained within said cassette shell;
- a pair of disks rotatably fitted on said core, said disks being fixed in position within said cassette shell so as not to be rotated when said core is rotated;
- a circumferential lip formed on each of said disks at an outer circumferential periphery, said lips being engaged with an outermost turn of said film roll while said core is rotated in a direction of unwinding, such that said film roll is rotated along with said core without loosening said film roll in order to advance a leader of said film roll through said film passage slit to an exterior of said cassette shell;
- and
- notches formed in said lips, proximate said film passage slit, such that said film leader, separated from said film roll, passes through said notches toward said film passage slit when said core is rotated in a direction of unwinding.
Dependencies are inferred from the claim text.