Doctor bar mechanism

Claim 1

IN DOCTOR BAR MECHANISM, SUPPORTING MEANS, AN INTERMEDIATE ROTATABLE TUBULAR SHAFT JOURNALED UPON THE SUPPORTING MEANS, AN INNER AXIALLY RECIPROCATORY SHAFT COAXIALLY MOUNTED TELESCOPICALLY WITHIN SAID INTERMEDIATE TUBULAR SHAFT AND MOVABLE RELATIVE THERETO, AN OUTER TUBULAR SHAFT AND ENCLOSING A MAJOR PORTION OF THE LATTER, RIGID KEY MEANS INTERCONNECTING THE INNER RECIPROCATORY SHAFT AND THE OUTER TUBULAR SHAFT WHEREBY THE SAME MAY RECIPROCATE AS A UNIT RELATIVE TO THE INTERMEDIATE TUBULAR SHAFT, THE INTERMEDIATE TUBULAR SHAFT HAVING A SLOT RECEIVING THE KEY MEANS MOVABLY, SUBSTANTIALLY FRICTIONLESS ROLLER MEANS INTERCONNECTING THE INTERMEDIATE AND OUTER TUBULAR SHAFTS SO THAT THE SAME MAY TURN AS A UNIT AND HAVE RELATIVE AXIAL MOVEMENT, DOCTOR BLADE HOLDER MEANS MOUNTED BODILY UPON THE OUTER TUBULAR SHAFT AND MOVABLE THEREWITH, MEANS CONNECTED WITH THE INTERMEDIATE TUBULAR SHAFT TO ADJUST THE SAME ROTATABLY TO SWING THE DOCTOR BLADE HOLDER MEANS IN AN ARC ABOUT THE AXIS OF THE INNER SHAFT, A SERVOMOTOR CONNECTED WITH SAID SHAFT TO RECIPROCATE THE SAME AND THEREBY RECIPROCATE THE OUTER TUBULAR SHAFT AND DOCTOR BLADE HOLDER MEANS, AND CONTROL MEANS FOR THE SERVOMOTOR OPERATED DIRECTLY BY THE MOVEMENT OF THE INNER RECIPROCATORY SHAFT.