Adjustable anvil for cutting window apertures and like openings in blanks

Claim 1

A COUNTER ROLLER FOR COOPERATING WITH A ROLLER HAVING A CUTTING ELEMENT TO CUT WINDOW OPENINGS IN ENVELOPE AND LIKE BLANKS WHICH ARE FED IN SUCCESSIVE ORDER BETWEEN THE ROLLERS, WHEREIN SAID COUTER ROLLER INCLUDES A CYLINDRICAL CORE HAVING THREADS AT ONE END AND A FIXED COLLAR AT THE OPPOSITE END ENCIRCLING THE CYLINDRIVAL FACE OF SAID CORE, SAID CORE HAVING A GROOVE EXTENDING LONGITUDINALLY IN THE CYLINDRICAL FACE OF THE CORE FROM NEAR THE COLLAR AND TERMINATING SHORT OF SAID THREADED END OF THE CORE, A TUBULAR ASSEMBLY ROTATABLY ADJUSTABLE ON THE CYLINDRICAL SURFACE OF THE CORE IN COVERING RELATION WITH SAID GROOVE, JOURNALS EXTENDING AXIALLY FROM THE ENDS OF THE CORE FOR ROTATABLY MOUNTING SAID COUNTER ROLLER AND ONE OF SAID JOURNALS HAVING A SUCTION DUCT CONNECTED WITH SAID GROOVE FOR ESTABLISHING A SUCTION IN THE GROOVE, SAID TUBULAR ASSEMBLY HAVING A PLURALITY OF LONGITUDINALLY EXTENDING ROWS OF SUCTION HOLES SUCCESSIVELY REGISTRABLE WITH SAID GROOVE WHEN THE ASSEMBLY IS TURNED ON THE CORE TO SELECT A ROW OF HOLES TO BE EFFECTIVE FOR GRIPPING THE BLANKS, AND MEANS ON THE CORE AND HAVING THREADS ENGAGING THE THREADS OF THE CORE TO COOPERATE WITH THE FIXED COLLAR FOR CLAMPING THE ASSEMBLY IMMOVABLY ON THE CORE.