Rotary slotting apparatus

Claim 1

IN AN APPARATUS WHEREIN CUTTING HEADS ON A PAIR OF SHAFTS ARE SO ORIENTED THAT THE SLOTTING BLADE OF THE MALE HEAD NORMALLY INTERMITTENTLY PROJECTS BETWEEN THE CUTTING DISCS OF THE FEMALE HEAD DURING THE RELATIVE ROTATION OF THE SLOTTING HEADS FOR CUTTING SLOTS IN PAPERBOARD BLANKS, THE IMPROVEMENT COMPRISING A MALE CUTTING BLADE HAVING A WIDTH SMALLER THAN THE WIDTH BETWEEN SAID FEMALE DISCS SO THAT SUBSTANTIAL CLEARANCE EXISTS BETWEEN THE SIDE OF THE DISC AND THE BLADE, A SPUR ON THE LEADING EDGE OF SAID BLADE OF A WIDTH LESS THAN THE DISTANCE BETWEEN SAID DISCS, AND A POSITIONING MEANS BETWEEN SAID SPUR AND SAID CUTTING BLADE FOR MAINTAINING SAID MALE SLOTTING BLADE AND SAID CUTTING DISCS IN A SET RELATIVE POSITION FOR MOVEMENE OF SAID HEADS AXIALLY OF SAID SHAFTS, SAID SPUR TAPERING TOWARD SAID POSITIONING MEANS, SAID POSITIONING MEANS BEING AN ARCUATE LENGTH OF SUBSTANTIALLY RECTANGULAR CROSS-SECTION HAVING ITS DIMENSION AXIALLY OF SAID MOUNTING SHAFTS SUBSTANTIALLY EQUAL TO THE DISTANCE BETWEEN SAID CUTTING DISCS, AND SAID CUTTING MEANS BEING AN ARCUATE LENGTH OF CONSTANT SUBSTANTIALLY RECTANGULAR CROSS-SECTION THROUGHOUT THE LENGTH THEREOF HAVING ITS DIMENSION IN THE DIRECTION AXIALLY OF SAID MOUNTING SHAFTS SUBSTANTIALLY SMALLER THAN THE DISTANCE BETWEEN SAID CUTTING DISCS AND THE TOTAL ARCUATE LENGTH OF SAID INTRODUCING MEANS AND SAID ALIGNING MEANS BEING SMALL COMPARED TO THE COMPARABLE ARCUATE LENGTH OF SAID CUTTING MEANS.