Umlaufendes Perforiergeraet

摘要

A rotary film perforating apparatus for making the edge perforations in photographic film comprising a rotary wheel carrying on its periphery closely spaced individual perforator assemblies. Each perforator assembly comprises a base fitted with a die element and a pivotable perforator arm carrying a punch element and both elements may be readily removed from the assembly. The arm frictionally engages wall portions of the die element to thereby receive exact guidance with respect to the die. The material hardness of the arm is greater than that of the die so that the arm does not wear out and the replacement of a used die element by a new one entails automatically a renewal of the guidance of the perforator arm.