Adjustable ink supply device in rotary printing presses

Claim 1

AN INKING DEVICE COMPRISING A LONGITUDINAL BACK PIECE, TWO SIDE PIECES AND A BOTTOM PLATE DEFINING THE BACK, SIDES AND BOTTOM RESPECTIVELY OF AN INK TROUGH, THE FRONT WALL OF THE TROUGH BEING FORMED BY A ROTARY PRINTING ROLLER ADAPTED TO SEALINGLY FIT WITH THE FORWARD SURFACES OF SAID SIDE PIECES AND THE FORWARD EDGE OF SAID BOTTOM PLATE, SAID BACK PIECE HAVING A LONGITUDINALLY EXTENDING INTERNAL CHAMBER HAVING AN INLET FOR RECEIVING INK FROM A SOURCE UNDER PRESSURE, SAID INLET BEING ASSOCIATED WITH A VALVE CONTROLLED BY A DEVICE SENSING THE LEVEL OF INK IN THE TROUGH AND BEING PROVIDED TO CLOSE SAID VALVE WHEN THE INK REACHES A PREDETERMINED LEVEL AND TO OPEN SAID VALVE WHEN THE LEVEL DECREASES BELOW SAID PREDETERMINED LEVEL, SAID INTERNAL CHAMBER BEING FORMED BY A GROOVE IN THE FRONT SIDE OF THE BACK PIECE CLOSED AT ITS OPEN FRONT BY TWO OVERLAPPING STRIPS PROVIDED WITH THROUGH HOLES AND BEING SLIDABLY AND SEALINGLY GUIDED IN GROOVES IN THE UPPER AND LOWER WALLS OF SAID GROOVE EACH OF THE STRIPS BEING SUBSTANTIALLY LESS IN EXTENT THAN THE BACK PIECE AND, ONE OF SAID STRIP BEING SECURED TO ONE OF SAID SIDE PIECES WHICH IS SLIDABLE IN THE INTERNAL CHAMBER TO FORM ONE END WALL THEREOF, AND THE OTHER OF SAID STRIPS BEING SECURED TO THE OTHER SIDE PIECE WHICH IS ALSO SLIDABLE IN THE INTERNAL CHAMBER TO FORM THE OTHER END WALL THEREOF.