Patent ID: 6334378
Filing Date: 2002-01-01
Classification: B26D,B26F,Y10S,Y10T

Abstract:
A method for making a line of perforations in a first section of a continuous photographic film along at least one lateral side of said continuous photographic film, first sections alternating with second sections along said continuous photographic film, said second sections having no perforations formed therein, said first sections defining a plurality of frame exposure locations at constant intervals L therein, at least one of said perforations being allocated to each of said frame exposure locations so as to index said frame exposure locations, said method comprising the steps of:(a) providing first and second die sets, each of said first and second die sets having a plurality of punches and dies, said first die set being capable of making a first number of said perforations through a length of LÃ—A, A being an integer of more than 1, said second die set being capable of making a second number of said perforations through a length of LÃ—B, B being an integer of more than 1; (b) designating one of first, second and third film types, said first section having the length LÃ—A in said first type, the length LÃ—(A+B) in said second type, and LÃ—(2A+B) in said third type; (c) selecting, depending on the film type designated in step (b), one of first and second feeding modes; (d) feeding said continuous film by a given length at a time in said first feeding mode, said given length being equal to a sum of the length of one of said first sections and a length of a corresponding one of said second sections; (e) feeding said continuous film by said given length divided into first and second feeding times in said second feeding mode; (f) actuating, when said first type is designated, only said first die set after feeding said continuous film in said first feeding mode; (g) actuating, when said second type is designated, both of said first and second die sets at a time after feeding said continuous film in said first feeding mode; (h) actuating, when said third type is designated, both of said first and second die sets simultaneously after said first time of feeding in said second feed mode, and then actuating said first die set after said second time of feeding in said second feeding mode; and (i) repeating steps (f), (g) or (h) until said designated one film type is to be changed.