Roll-film for cassette - having jaws at entry to take=up chamber onto which raised film cam latches

摘要

Roll-film esp. with backing paper, is formed for use in a dual chamber cassette with exposure window between the two chambers. Both chambers have jaws, so that although the film can be wound out of the supply chamber it cannot be wound completely into the take-up chamber because the film latches onto the input jaws. The raised cam (10) at the film (2) end jams in the jaws (7) on the inlet to the take-up chamber (4).