Slitter apparatus with compensating device for slitter blades

The present invention relates to a slitter apparatus with a compensating device for slitter blades thereof to provide a stable or proper operation for cutting a corrugated cardboard sheet. The slitter apparatus according to the present invention is comprised of a plurality of slitter heads 20-24 disposed in-line in the width direction of the corrugated cardboard sheet, each of the slitter heads including a disk-shaped slitter blade 40 for cutting the corrugated cardboard sheet being continuously fed along a feeding line by moving the disk-shaped slitter blades toward the corrugated cardboard sheet. The apparatus further comprises positioning sensors 50 for detecting the vertical position of each of the disk-shaped slitter blades 40, and an optical sensor 58 having an optical axis 60 generally disposed in a parallel relationship with respect to the corrugated cardboard sheet. The moving the disk-shaped slitter blades of the slitter heads 20-24 are moved one by one toward the optical axis 60 of the optical sensor 58 in such a way that the respective circumferential cutting edges of the disk-shaped slitter blades 40 interrupt the optical axis 60 of the optical sensor 58, whereby the radius of each of the disk-shaped slitter blades 40 is measured based on the position of each of the disk-shaped slitter blades at the moment when it interrupts the optical axis 60. Based on the radii of the disk-shaped slitter blades measured in such a manner, the depth of engagement between the circumferential cutting edges of the disk-shaped slitter blades 40 and slitter pads is compensated properly.