Feed mechanism for an apparatus for opposing offset in printing

Claim 1

A POWDER DISPENSER COMPRISING, A SUBSTANTIALLY RECTANGULAR SHAPED FRAME OF THE TYPE ADAPTED TO EXTEND TRANSVERSELY ABOVE A MOVING BED OF A PRINTING MACHINE CARRYING FRESHLY PRINTED WEBS AND PRINTED SHEETS, INCLUDING AN ELONGATED CONTAINER FOR POWDERED MATERIAL CARRIED BY SAID FRAME AND HAVING A REAR, FRONT, BOTTOM AND END WALLS, SAID BOTTOM WALL SLANTING FORWARDLY AND DOWNWARDLY FROM SAID REAR WALL AND TERMINATING IN SPACED RELATION WITH SAID FRONT WALL FORMING AN ELONGATED RELATIVELY LARGE DISCHARGE OPENING, A ROLLER MOUNTED FOR ROTATION SUBSTANTIALLY CLOSING SAID OPENING AND IN SEALING RELATIONSHIP WITH THE END TERMINATION OF SAID BOTTOM WALL, AN AIR CONDUIT ABOVE AND ADJACENT THE FORWARD PORTION OF SAID ROLLER, MEANS FOR PROVIDING A STEADY FLOW OF AIR THROUGH SAID AIR CONDUIT TO IMPINGE UPON THE OUTER PERIPHERAL SURFACE OF SAID ROLLER, A FEED MECHANISM FOR SUPPLYING A STEADY AND EVEN FLOW OF POWDERED MATERIAL TO SAID CONTAINER INCLUDING, A LONGITUDINALLY EXTENDING HOLLOW FEED TUBE EXTENDING THROUGH SAID CONTAINER ABOVE THE BOTTOM WALL THEREOF AND HAVING ITS END TERMINATIONS PROJECTING BEYOND THE RESPECTIVE END WALLS OF SAID CONTAINER, A POWDERED MATERIAL SUPPLY HOPPER ADJACENT ONE END TERMINATION OF SAID FEED TUBE, SAID RESPECTIVE END OF SAID FEED TUBE BEING SO CONSTRUCTED AND ARRANGED AS TO EXTEND INTO THE SAID HOPPER ADJACENT THE BOTTOM PORTION THEREOF, A LONGITUDINALLY EXTENDING SPIRAL FEED SCREW RECEIVED IN SAID TUBE AND EXTENDING SUBSTANTIALLY THROUGH THE ENTIRE LENGTH THEREOF, MEANS PROVIDING OPEN COMMUNICATION BETWEEN SAID FEED TUBE AND SAID HOPPER, MEANS WITHIN SAID CONTAINER FOR EVENLY AND STEADILY DISPERSING SAID POWDERED MATERIAL FROM SAID TUBE INTO SAID CONTAINER, AND MEANS FOR ROTATING SAID FEED SCREW TO CONSTANTLY AND SIMULTANEOUSLY FEED MATERIAL THROUGH SAID TUBE INTO SAID CONTAINER AND OUT THE OPEN END TERMINATION OF SAID TUBE.