Cardboard sheet-cutting device with a movable mark detector

A cutting controller for a cardboard sheet in a cardboard sheet-cutting device, the cardboard sheet-cutting device comprising:

• an ink jet printer configured to print a cutting mark on a cardboard sheet under transport;
• a slitter scorer configured to cut the cardboard sheet under transport to a predetermined width in a longitudinal direction;
• a mark detector configured to detect the cutting mark in the cardboard sheet under transport;
• and
• a cutoff configured to cut the cardboard sheet under transport in a width-direction and produce the cardboard sheet with a predetermined length,
• wherein the controller is configured to:
• change a control setting value of the mark detector based on a change in printing image information, the printing image information comprises a cutting width of the cardboard sheet to be cut by the slitter scorer according to the change in the printing image information, the control setting value comprises a detection position where the mark detector is configured to detect the cutting mark after the change;
• and
• change the control setting value of the mark detector based on the changed printing image information, while the cardboard sheet is transported.