Method and an arrangement for the forward feeding of a material web in register with a crease line pattern

Abstract

In the intermittent forward feeding of a material web provided with transverse crease lines and simultaneous punching of holes into the material web in a definite relation to the crease line pattern, it is important to ensure that any faults in the length of the forward feed, do not accumulate during working over longer periods. Such faults, which occur due to unavoidable inaccuracies would lead successively to ever increasing faultiness in the placing of the holes. A method and an arrangement adapted to avoid the accumulation of such faults are provided. In the method the material web during each forward feeding is advanced a distance which exceeds the correct distance between two transverse lines by the fault margin. Subsequently, before the next forward feeding, the web is restored to a correct position, not affected by any faults in the distance between the crease lines. An arrangement for the carrying out of the method has, beside a driving element in the form of a driven roller situated in contact with the material web, also a register-holding element. The register holding element includes drivers, which engage with the transverse crease lines, and which after each forward feeding, with simultaneous disengagement of the driving element, restores the web a certain distance so as to place the crease lines into the correct position.

Dependencies are inferred from the claim text.