Roll photo film and take-up spool combined therewith

Abstract

A take-up spool to be set in a photo film take-up chamber is used with a roll photo film of the 120 type to be loaded in a photo film supply chamber. The take-up spool has a slit, formed in a spool core to extend in an axial direction, is open in first and second openings, and has first and second walls. A trapezoidal erect plate is disposed erectly on the first wall, oriented crosswise to the axial direction. The erect plate has first and second inclined edges, confronted respectively with the first and second openings, and inclined with reference to the first wall. A pair of lateral claws are disposed on respective lateral faces of the erect plate to extend in the axial direction. Two press ridges project from the second wall. In combination, the roll photo film includes a spool, a photo filmstrip, a trailer, a leader, and a retainer hole formed in the leader. The retainer hole receives insertion of the erect plate, and is retained by the lateral claws. In the retainer hole, a retaining region has a retaining edge, disposed farther from the photo filmstrip, and engaged with the lateral claws. A releasing region is formed with the retaining region to extend toward the photo filmstrip, for facilitating removal of the lateral claws.