Method and device for adjusting heights of slitter blade

A device for adjusting the height of a circular slitter blade which slits a corrugated board web traveling continuously along a traveling direction of the corrugated board web while the corrugated board web being interposed between a receiving roll and a circular slitter blade, the receiving roll and the circular slitter blade having outer circumferential surfaces that move in the same direction as the traveling direction of the corrugated board web, the circular slitter having a center that is located on a downstream side of a center of the receiving roll in the traveling direction of the corrugated board, the device comprising:

• an emitting device which emits a light beam in a width direction of the corrugated board web to pass through a contact position of the outer circumferential surface of the receiving roll with the corrugated board web;
• a light receiver which receives the light beam;
• an actuator which moves the slitter blade close toward or away from the receiving roll;
• a memory device which memorizes a height of the slitter blade where the circular outer edge of the slitter blade intercepts the light beam;
• and
• a controller which controls the actuator so as to move the slitter blade toward the receiving roll to the height where the circular outer edge of the slitter blade intercepts the light beam.