Doctors for papermaking machines

Claim 1

A DOCTOR FOR DOCTORING A ROLL OF A PAPERMAKING MACHINE COMPRISING A DOCTOR BLADE, A BLADE HOLDER MOUNTING SAID BLADE, A PRESSURE PLATE ALSO MOUNTED ON SAID HOLDER AND BEARING AGAINST THE FACE OF THE DOCTOR BLADE REMOTE FROM THE ROLL, A SUCTION DUCT EXTENDING FRO THE LENGTH OF SAID BLADE, MEANS ATTACHING SAID BLADE HOLDER TO SAID SUCTION DUCT, A PLURAITY OF CONTIGUOUS, RIGID SUCTION NOZZLES ATTACHED TO SAID SUCTION DUCT WHICH EXTEND FORWARDLY FROM THE SUCTION DUCT TO THE VICINITY OF THE TIP OF THE DOCTOR BLADE, EACH SUCTION NOZZLE TERMINATING AT ITS FORWARD END IN AN ELONGATED SUCTION ORIFICE ADJACENT THE PRESSURE PLATE AND HAVING ONE SIDE DEFINED BY SAID PRESSURE PALTE, AND HAVING AT ITS NEAR END AN ORIFICE COMMUNICATING WITH AN ORIFICE IN THE SUCTION DUCT, SAID SUCTION NOZZLES COLLECTIVELY DEFINING A CONTINUOUS WALL, EXTENDING REARWARDLY AT A GRADUAL INCLINATION FROM THE DOCTOR BLADE TO THE SUCTION DUCT, AND ORIFICE PLATES ACCOMMODATED IN SLOTS IN THE SUCTION NOZZLES, SAID ORIFICE PLATES CONTROLLING THE FLOW OF AIR THROUGH THE SUCTION NOZZLES TO THE ORIFICES IN THE SUCTION DUCTS, HAVING GRADED ORIFICES WHICH PROVIDE UNIFORMITY OF SUCTION THROUGH THE SUCTION NOZZLES, BEING ACCOMMODATED IN SLOTS IN THE SUCTION NOZZLES AND BEING MANUALLY REMOVABLE FROM AND REPLACEABLE IN SAID SLOTS BY SLIDING MOVEMENT.