Method of switching cutting knife arrangements

摘要

A slitter slits a wide sheet into a plurality of narrow strips by use of a plurality of cutting knives (4u) mounted on a shaft (2u) extending in a direction substantially normal to the direction in which the wide sheet is fed. Cutting knife arrangements are switched by controlling a knife moving mechanism (6u) to move the cutting knives (4u) along the shaft so that one of n-sorts of cutting knife arrangements in each of which the cutting knives are arranged in regular intervals is obtained. n-sets of knife positioning programs each for moving the cutting knives from respective origin positions to positions for the corresponding cutting knife arrangement and n-sets of knife returning programs each for returning the cutting knives from positions for the corresponding cutting knife arrangement to the respective origin positions are stored in a memory. When the knife arrangements are switched from a first knife arrangement (21-27) to a second knife arrangement (31-37), the cutting knives are once returned to the respective origin positions (G1-G7) according to the knife returning program for the first knife arrangement and then moved to the positions for the second knife arrangement according to the knife positioning program for the second knife arrangement.