Dryer ventilating roll

Claim 1

IN A FELT ROLLER FOR PAPER MACHINE DRYERS COMPRISING: A CYLINDER ROLL SHELL MOUNTED FOR FREE ROTATION ABOUT A HORIZONTAL AXIS AND HAVING A PLURALITY OF AIR PASSAGEWAYS LEADING THROUGH THE PERIPHERY THEREOF FROM THE HOLLOW INTERIOR THEREOF FOR PASSING HEATED AIR THERETHROUGH, A HOLLOW NON-ROTATABLY CYLINDRICAL AIR DISTRIBUTOR SHELL SPACED RADIALLY INWARDLY OF THE INNER PERPIPHERY OF SAID ROLL SHELL AND EXTENDING THEREALONG AND HAVING A PERFORATE AREA HAVING AIR DISTRIBUTOR PASSAGEWAYS LEADING THERETHROUGH FOR SUPPLYING HEATED AIR TO SAID AIR PASSAGEWAYS LEADING THROUGH THE PERIPHERY OF SAID ROLL SHELL, CIRCUMFERENTIALLY AND AXIALLY SPACED SEALING MEANS SEALING SAID AREA OF THE INTERIOR OF SAID ROLL SHELL. AND MODULATOR VALVE MEANS ROTATABLY MOUNTED AT EACH END OF SAID DISTRIBUTOR SHELL FOR ADJUSTABLE MOVEMENT ABOUT THE INNER PERIPHERY OF SAID DISTRIBUTOR SHELL, SAID MODULATOR VALVE MEANS HAVING CIRCUMFERENTIALLY AND AXIALLY SPACED SEALS HAVING SEALING ENGAGEMENT WITH THE INTERIOR OF SAID DISTRIBUTOR SHELL AND BEING MOVABLE TO SEAL OFF THE OPPOSITE END PORTIONS OF THE PASSAGEWAYS LEADING THROUGH SAID DISTRIBUTOR SHELL AND TO VARY THE FLOW THROUGH SAID PASSAGEWAYS, AND ADJUSTMENT MEANS CONNECTED WITH EACH MODULATOR VALVE MEANS FOR ADJUSTABLY MOVING SAID MODULATOR VALVE MEANS INDEPENDENTLY OF EACH OTHER.