Control system for cyclically operating machines

Claim 1

IN A MACHINE FOR ACTING ON SUCCESSIVE SHEETS OF MATERIAL FED THROUGH THE MACHINE, IN COMBINATION, AN ELECTRIC MOTOR FOR DRIVING THE MACHINE, A RELAY OPERATED SWITCH CONTROLLING THE SUPPLY OF OPERATING CURRENT TO THE MOTOR, A CYCLICALLY OPERATING SHAFT, A CLUTCH FOR DRIVING SAID SHAFT, A STARTING SWITCH AND A CONTROL SWITCH SPACED APART FOR ACTUATION IN PREDETERMINED TIMED RELATION BY THE SHEETS AS THEY ARE FED THROUGH THE MACHINE, A CIRCUIT CLOSED BY SAID STARTING SWITCH WHEN ACTUATED EFFECTIVE TO ENGAGE SAID CLUTCH TO INITIATE THE ROTATION OF SAID SHAFT, A TIMING SWITCH, A CAM ON SAID SHAFT OPERATIVE TO ACTUATE SAID TIMING SWITCH IN PREDETERMINED ANGULAR POSITIONS OF THE SHAFT, AND A CIRCUIT CONTROLLED JOINTLY BY SAID CONTROL SWITCH AND SAID TIMING SWITCH FOR CAUSING SAID RELAY OPERATED SWITCH TO BE ACTUATED WHEN SAID CONTROL SWITCH AND SAID TIMING SWITCH ARE ACTUATED OTHER THAN SIMULTANEOUSLY.