Rotary tablet press having means to rotate the plungers

Claim 1

IN A TABLET PRESS, THE COMBINATION COMPRISING A FRAME, A DIE HEAD MOVABLY SUPPORTED ON SAID FRAME, AT LEAST ONE VERTICAL DIE OPENING IN SAID HEAD, A LOWER PUNCH POSITIONED BENEATH SAID HEAD WITH ITS UPPER END EXTENDING INTO THE DIE OPENING, A LOWER PRESSURE ROLL MOUNTED BELOW SAID DIE HEAD AND IN ALIGNMENT WITH THE PATH OF TRAVEL OF SAID LOWER PUNCH TO MOVE IT UPWARDLY INTO MAXIMUM COMPRESSIVE PRESSURE, AN UPPER PUNCH POSITIONED ABOVE SAID DIE HEAD WITH ITS LOWER END IN AXIAL ALIGNMENT WITH THE DIE OPENING INCLUDING MEANS FOR MOVING THE SAID LOWER END INTO THE DIE OPENING, AN UPPER PRESSURE ROLL MOUNTED ABOVE SAID DIE HEAD AND IN ALIGNMENT WITH THE PATH OF TRAVEL OF SAID UPPER PUNCH TO MOVE IT DOWNWARDLY INTO MAXIMUM COMPRESSIVE PRESSURE SIMULTANEOUSLY WITH THE COMPRESSIVE MOVEMENT OF SAID LOWER PUNCH TO FORM A TABLET, MEANS FOR ROTATING THE UPPER PUNCH IN ONE DIRECTION AND MEANS FOR ROTATING THE LOWER PUNCH IN THE OPPOSITE DIRECTION DURING THE PERIOD OF MAXIMUM COMPRESSIVE PRESSURE TO ELIMINATE STICKING OF TABLET MATERIAL TO THE PUNCHES, AT LEAST ONE OF SAID ROTATING MEANS INCLUDING A CAM SURFACE ON AT LEAST ONE OF SAID PUNCHES, A COOPERATING ROTATION ROLLER MOUNTED ON THE FRAME TO ENGAGE THE SAID CAM SURFACE OF SAID PUNCH AS IT MOVES THROUGH THE PERIOD OF MAXIMUM PRESSURE IN THE COMPRESSIVE CYCLE, SAID CAM SURFACE ENGAGING SAID ROTATION ROLLER SO THAT ROTATION OF THE PUNCH IS INITIATED WITH A MINIMUM OF IMPACT.