Tandem printer

Claim 1

IN AN OFFSET PRINTING MACHINE OF THE KIND COMPRISING FIRST AND SECOND PRINTING HEADS CONNECTED IN TANDEM AND DRIVEN IN UNISON TO PERFORM TWO SEQUENTIAL PRINTING OPERATIONS ON EACH OF A PLURALITY OF PRINT-RECEIVING SHEETS, EACH PRINTING HEAD INCLUDING A MASTER CYLINDER, A BLANKET CYLINDER, A MAIN CONTROL MEMBER MOVABLE BETWEEN AN INITIAL POSITION, AT LEAST ONE INTERMEDIATE OPERATING POSITION, AND A FINAL OPERATING POSITION, REPELLANT APPLICATOR MEANS FOR APPLYING AN INK REPELLENT SOLUTION TO SAID MASTER CYLINDER, INKING MEANS FOR APPLYING INK TO A PLANOGRAPHIC MASTER MOUNTED ON SAID MASTER CYLINDER, BLANKET IMAGING MEANS FOR MOVING ONE OF SAID MASTER AND BLANKET CYLINDERS FROM AN INITIAL POSITION DISPLACED FROM THE OTHER CYLINDER INTO A BLANKET-IMAGING CONTACT POSITION THEREWITH, MEANS OPERATIVELY CONNECTING SAID REPELLANT APPLICATOR MEANS, SAID INKING MEANS, AND SAID BLANKET IMAGING MEANS TO SAID MAIN CONTROL MEMBER FOR ACTUATION IN PREDETERMINED SQUENCE IN RESPONSE TO MOVEMENT OF SAID MAIN CONTROL MEMBER, AND AN ELECTRICALLY ACTUATED CONTROL MECHANISM FOR ADVANCING SAID MAIN CONTROL MEMBER BETWEEN SAID POSITIONS, SEQUENCE CONTROL MEANS COMPRISING: FIRST CIRCUIT MEANS FOR ACTUATING THE CONTROL MECHANISM OF SAID FIRST PRINTING HEAD TO ADVANCE THE FIRST MAIN CONTROL MEMBER STEP-BY-STEP FROM ITS INITIAL OPERATING POSITION TO ITS FINAL OPERATING POSITION; SECOND CIRCUIT MEANS CONNECTING THE CONTROL MECHANISM OF SAID SECOND PRINTING HEAD TO SAID FIRST CIRCUIT MEANS FOR ACTUATION TO ADVANCE THE SECOND MAIN CONTROL MEMBER TO INTERMEDIATE POSITION IN UNISON WITH THE FIRST MAIN CONTROL MEMBER; AND PROGRAM CONTROL MEANS, CONNECTED IN SAID SECOND CIRCUIT MEANS, FOR PRECLUDING ACTUATION OF THE SECOND CONTROL MECHANISM FROM SAID FIRST CIRCUIT MEANS WHEN SAID MAIN CONTROL MEMBERS ARE IN THEIR INTERMEDIATE POSITIONS AND FOR ENERGIZING SAID SECOND CIRCUIT MEANS INDEPENDENTLY OF SAID FIRST CIRCUIT MEANS TO ADVANCE SAID SECOND MAIN CONTROL MEMBER TO FINAL POSITION A PREDETERMINED NUMBER OF MACHINE CYCLES AFTER THE FIRST MAIN CONTROL MEMBER IS ADVANCED TO ITS FINAL OPERATING POSITION.