Inspecting method for disk used in photo film cassette

摘要

A photo film cassette has a spool core (13) about which the photo film is wound in a roll form. A flexible disk (16, 17) is secured to each of two ends of the spool core, for regulating each of edges of the photo film. Material of the disk being thermoplastic synthetic resin sheet (27). The sheet is subjected to vacuum/air-pressure forming to form a disk-like portion (50). The disk is cut out of the disk-like portion by a punch/die set (31) before conveyance to a spool core mounting station. To inspect the disk, a photoelectric switch (54) includes a projector (54a) for applying a beam to a die of the punch/die set after cutting out the disk. A receiver (54b) measures the beam reflected by the die. A controller (55) evaluates the measured beam, to inspect occurrence of deposition of the disk on the punch/die set. If the deposition occurs, the controller considers the disk likely to overlie on one subsequent disk.