Open throat bed and cylinder imprinting machine

Claim 1

AN IMPRINTING MACHINE, COMPRISING IN COMBINATION, A MAIN FRAME HAVING A PLATEN BASE FOR HOLDING IMPRINTING ELEMENTS, AN OPERATING SHAFT MOUNTED FOR OSCILLATION ON SAID MAIN FRAME, A CAM FRAME MOUNTED FOR UP AND DOWN MOVEMENT ON SAID MAIN FRAME, RESILIENT MEANS URGING SAID CAM FRAME UPWARD, HOLD-DOWN CAMS CARRIED BY SAID CAM FRAME, AN IMPRESSION ROLL MOUNTED ON A ROLL SHAFT HAVING RECIPROCATORY MOVEMENT UNDER SAID HOLDDOWN CAMS, OPERATING CONNECTIONS BETWEEN SAID ROLL SHAFT AND SAID OPERATING SHAFT FOR MOVING THE ROLL SHAFT BACK AND FORTH WHEN THE OPERTING SHAFT IS OSCILLATED, A WEDGE CAM MOUNTED ON SAID OPERATING SHAFT, A WEDGE ROLLER MOUNTED IN A GUIDE SLOT WITH A CLOSED END ON SAID CAM FRAME, THE WEDGE ROLLER STANDING BELOW THE AXIS OF SAID OPERATING SHAFT AT TIMES, A SPRING CONNECTED TO SAID WEDGE ROLLER TO URGE IT AGAINST THE CLOSED END OF SAID SLOT IN A POSITION BELOW THE OPERATING SHAFT AXIS, SAID WEGE CAM HAVING AND INCLINED CAMMING PORTION OF SHORT RADIUS AT ITS INNER END BENEATH WHICH SAID WEDGE ROLLER NORMALLY RESTS WHEN THE IMPRESSION ROLL IS IN ITS RETRACTED OR HOME POSITION, THE CAM FRAME AND HOLD-DOWN CAM BEING RAISED IN THE HOME POSITION, SAID WEDGE CAM HAVING A RAISED CONCENTRIC PORTION FOLLOWING THE INCLINED PORTION FOR HOLDING SAID WEDGE ROLLER AND CAM FRAME DOWN WHEN THE ROLL IS MOVING ON ITS OUTWARD PRINTING STROKE, SAID WEDGE HAVING A RADIAL PORTION FOLLOWING THE CONCENTRIC PORTION TO ALLOW THE WEDGE ROLLER AND CAM FRAME TO RISE AT THE END OF FORWARD MOVEMENT OF THE IMPRESSION ROLL, THE RADIAL PORTION AND THE RAISED CONCENTRIC PORTION HOLDING THE WEDGE ROLLER OUT OF WEDGING POSITION WHEN THE OPERATING SHAFT IS TURNED REVERSELY TO MOVE THE IMPRESSION ROLL BACK UNTIL THE INCLINED CAMMING PORTION IS REACHED NEAR THE END OF THE RETURN STROKE, THE SPRING THEN MOVING THE WEDGE ROLLER BACK INTO ITS POSITION BELOW THE AXIS OF THE POWER SHAFT.