Slitter band structure with hardened cutting edge

Claim 1

A MACHINE FOR SLITTING AT HIGH SPEED A CONTINUOUSLY TRAVELLING PAPER WEB COMPRISING, A CIRCULAR SLITTER BLADE WITH A RADIAL PLANAR SIDE SURFACE AND A BEVELLED SURFACE INCLINED RADIALLY INWARDLY AWAY FROM SAID SIDE SURFACE, A THIN HARD LAYER OF ABRASION RESISTANT MATERIAL SURFACE BONDED TO SAID SIDE SURFACE AND EXTENDING IN A UNIFORM THICKNESS LAYER TO THE EDGE THEREOF TO FORM A CUTTING EDGE WHERE THE SIDE SURFACE MEETS THE BEVELLED SURFACE, MEANS FOR ROTATABLY SUPPORTING THE SLITTER BLADE, A CYLINDRICAL SLITTER BAND HAVING A CYLINDRICAL OUTER SURFACE AND AN AXIALLY INWARDLY BEVELLED END SURFACE, A THIN HARD LAYER OF ABRASION RESISTANT MATERIAL SURFACE BONDED TO SAID OUTER SURFACE AND EXTENDING IN A UNIFORM THICKNESS LAYER TO THE EDGE THEREOF TO FORM A CUTTING EDGE WHERE THE CYLINDRICAL SURFACE JOINS THE BEVELLED END SURFACE, MEANS FOR ROTATABLY SUPPORTING THE SLITTER BAND ON AN AXIS PARALLEL TO THE SLITTER BLADE WITH THE CUTTING EDGES OVERLAPPING FOR SLITTING THE TRAVELLING WEB WITH SAID CYLINDRICAL SURFACE PROVIDING A SUPPORT FOR A WEB MOVING TANGENT THERETO, SAID BEVELLED EDGES OF SAID SLITTER BLADE AND SAID BAND FORMED OF A RELATIVELY SOFT MATERIAL FOR WEARING AWAY WITH ROTATION OF THE BLADE AND BAND AND THE ACTION OF THE CUT EDGES OF THE PAPER WEB TO MAINTAIN A SHARP CUTTING EDGE AT THE EDGE OF SAID HARD LAYERS ON THE BLADE AND BAND AND FOR EASE OF GRINDING AWAY SAID BEVELLED EDGES FOR MAINTAINING SHARP CUTTING EDGES.