Rotatable shearing blades for progressive transverse cutting

Claim 1

A CUTTING MECHANISM FOR SHEETS OR WEB MATERIAL COMPRISING A SUPPORT FRAME, A PAIR OF CUTTING BLADE ASSEMBLIES ROTATABLY SUPPORTED ON SAID FRAME ON SPACED, PARALLEL AXES OF ROTATION, ONE OF SAID CUTTING BLADE ASSEMBLIES INCLUDING AN ELONGATED MOUNTING BAR EXTENDING DIAMETRICALLY THROUGH THE AXIS OF ROTATION THEREOF, A BLADE JUXTAPOSED ON ONE SIDE OF SAID MOUNTING BAR AND EXTENDING SUBSTANTIALLY PARALLEL TO SAID AXES OF ROTATION, FASTENING MEANS EXTENDING TRANSVERSELY BETWEEN SAID MOUNTING BAR AND BLADE AND INCLUDING SPRING MEANS ENGAGING ONE SIDE OF SAID BLADE AND NORMALLY URGING THE BLADE TOWARD SAID MOUNTING BAR, SAID BLADE BEING FREE AT ITS ENDS, SAID OTHER CUTTING BLADE ASSEMBLY INCLUDING A BLADE EXTENDING SUBSTANTIALLY PARALLEL TO SAID AXES OF ROTATION AND PROJECTING TOWARD SAID FIRST MENTIONED BLADE, SAID BLADES INCLUDING LINEAR CUTTING EDGES EXTENDING SUBSTANTIALLY THE LENGTH THEREOF AND HAVING ARCUATE PATHS OF INTERSECTION FOR SHEARING A WEB OR SHEET DISPOSED THEREBETWEEN, SAID BLADES INCLUDING ONLY AT ONE END ABUTMENT MEANS PROJECTING RADIALLY BEYOND THE LINEAR CUTTING EDGES THEREOF AND ENGAGEABLE PRIOR TO INTERSECTION OF SAID LINEAR CUTTING EDGES OF SAID BLADES DURING SIMULTANEOUS ROTATION OF SAID BLADE ASSEMBLIES FOR CAUSING SAID SPRING-URGED BLADE TO BE LONGITUDINALLY AND PROGRESSIVELY TILTED IN SHEARING ACTION PROGRESSIVELY ALONG SAID BLADES, SAID MOUNTING BAR INCLUDING A SUBSTANTIALLY PLANAR SUPPORT SURFACE AGAINST WHICH SAID FIRST MENTIONED BLADE IS URGED BY SAID SPRING MEANS, SAID MOUNTING BAR INCLUDING AN ABUTMENT SURFACE SUBSTANTIALLY NORMAL TO SAID PLANAR SUPPORT SURFACE, SAID FIRST CUTTING BLADE INCLUDING A PLANAR SUPPORT SURFACE ENGAGING SAID MOUNTING BAR SUPPORT SURFACE AND A REAR ABUTMENT SURFACE AT AN ACUTE ANGLE TO SAID FIRST BLADE PLANAR SURFACE AND OPPOSITE THE CUTTING EDGE THEREOF, SAID SPRING MEANS NORMALLY URGING THE PLANAR SURFACES OF SAID MOUNTING BAR AND FIRST CUTTING BLADE INTO JUXTAPOSED RELATION AND DISPOSING THE REAR ABUTMENT SURFACE OF SAID FIRST CUTTING BLADE IN ANGULAR RELATION WITH RESPECT TO THE ABUTMENT SURFACE OF SAID MOUNTING BAR, SAID SUPPORT AND ABUTMENT SURFACES OF SAID MOUNTING BAR INTERSECTING TO DEFINE A PIVOT LINE PORTION TO PERMIT SAID FIRST CUTTING BLADE TO PIVOT AWAY FROM SAID MOUNTING BAR SUPPORT SURFACE AT SAID PIVOT LINE PORTION ON AN AXIS SUBSTANTIALLY NORMAL TO THE LONGITUDINAL AXIS OF SAID FIRST BLADE WHEN INITIAL CONTACT OCCURS BETWEEN SAID CUTTING BLADE ABUTMENT MEANS WHEREBY THE PROGRESSIVE SHEARING ACTION SUBSEQUENTLY OCCURS.