Paperboard sheet slitter-scorer apparatus and control method for correcting the positions of slitter knives and scorers thereof

A method for controlling the positional correction of slitter knives and scorers in a slitter scorer apparatus, comprising:

• a plurality of slitters having slitter knives for cutting a sheet parallely arrayed so as to be independently movable in the width direction relative to the direction of supply of the paperboard sheet;
• and a plurality of scorers for scoring the surface of a sheet parallely arrayed so as to be independently movable in the width direction relative to the direction of supply of the paperboard sheet:
• said method comprising the steps of:
• selecting utilized slitters and utilized scorers from among the plurality of slitters and scorers based a production order;
• calculating a first correction amount for each of the utilized scorers based on the amount of shearing by the slitter knives sequentially from one side in the width direction of the slitter scorer apparatus;
• calculating a second correction amount for each of the utilized slitter knives based on the amount of shearing by the slitter knives sequentially from the other side in the width direction of the slitter scorer apparatus;
• correcting the calculated first and second correction amounts to align the utilized scorers and the utilized slitter knives to the mechanical center, and calculating slitter knife correction amount and scorer correction amount relative to an initial position based on the desired dimension in the paperboard sheet width direction;
• positioning the utilized slitters and the utilized scorers at a position based on that calculated correction amounts.