Patent ID: 6190592
Filing Date: 2001-02-20
Classification: G03B

Abstract:
A method for producing flanges of a photo film cassette, said photo film cassette including:a spool core, on which said photo film is wound in a form of roll;a cassette shell for containing said spool core in rotatable fashion;first and second flanges, respectively provided with first and second bearing holes formed in a middle thereof, and secured to first and second ends of said spool core;said flange producing method comprising steps of:molding first and second disk pieces to be said first and second flanges;forming, using injection molding, a first circular recess in each of said disk pieces in a position corresponding to said bearing holes and in a face of each of said disk pieces opposite to a face receiving a punch device;forming, using injection molding, a second circular recess in each of said disk pieces in a position corresponding to said bearing holes and in a face of each of said disk pieces receiving said punch device;forming a circular sloped portion in at least said punch-receiving face of each said disk piece by forming, using injection molding, a circular edge around said second circular recess in inclination on said punch-receiving face; andmoving a punch device through a middle of said first and second disk pieces, to punch said first and second bearing holes in said first and second flanges.