Photographic roll film
AssigneeFuji Photo Film Co., Ltd.
InventorTeruyoshi Makino
Life of this patent
Estimating the term…
Abstract
In a 120- or 220-size roll film, a leader of a light-shielding paper has at least a hole to be engaged with a claw formed in a slit of a spool core. A pair of ribs are formed on an opposite wall of the slit from the claw. The ribs have a height larger than a thickness of the light-shielding paper plus a distance from a peak of the claw to the opposite wall, so that the ribs urge the leader toward the claw, and let the hole be caught on the claw. The claw has side projections which protrude in an axial direction of the spool core in proximity to the peak of the claw. Guide surfaces of the claw which face entrances of the slit are inclined toward each other, such that the hole caught on the claw is guided to be engaged with the side projections upon the leader being relatively moved away from the slit when the spool is rotated.
Claims18
A photographic roll film having a photographic filmstrip, a light-shielding paper secured to said photographic filmstrip at least at a leading end thereof, and a spool having said photographic filmstrip with said light-shielding paper wound in a roll thereon, said photographic roll film comprising:
- at least a hole formed through a leader of said light-shielding paper;
- a slit formed through a spool core of said spool along an axial direction of said spool core;
- at least a claw formed on a first wall of said slit, said claw being engaged with said hole when said leader is inserted in said slit, wherein said claw has side projections in proximity to the peak, said projections extending in said axial direction of said spool core;
- and
- at least a rib formed on a second wall of said slit which is opposite and parallel to said first wall, said rib pressing said leader of said light-shielding paper toward said first wall.
A photographic roll film having a photographic filmstrip, a light-shielding paper secured to said photographic film strip at least at a leading end thereof, and a spool having said photographic filmstrip with said light-shielding paper wound in a roll thereon, said photographic roll film comprising:
- at least one hole formed through a leader of said light-shielding paper;
- a first slit formed through an axial center of said spool core of said spool along an axial direction of said spool core, said first slit having no member to engage with said leader;
- a pair of second slits formed in parallel to said first slit on opposite sides thereof;
- at least one claw formed on a first wall of each of said second slits, said at least one claw being engaged with said at least one hole when said leader is inserted in one of said second slits, wherein said at least one claw has side projections in proximity to the peak, said projections extending in said axial direction of said spool core;
- and
- at least one rib formed in each of said second slits on a second wall which is opposite and parallel to said first wall, said at least one rib pressing said leader of said light-shielding paper toward said first wall.
A spool, for a photographic roll film, comprising:
- a spool core having a slit formed therethrough along an axial direction of said spool core;
- at least one claw formed on a first wall of said slit;
- and
- at least one rib formed on a second wall which is opposite and parallel to said first wall of said slit, wherein said at least one claw and said at least one rib are individually symmetrical about a plane extending through an axial center of said spool core and perpendicularly to said walls of said slit.
Dependencies are inferred from the claim text.