Intermittent drive for sequence switch mechanism

Claim 1

AN INTERMITTENT DRIVE MECHANISM FOR ADVANCING A MEMBER IN A STEP-BY-STEP MANNER COMPRISING IN COMBINATION: SUPPORT MEANS; A MOTOR-DRIVEN SHAFT CARRIED BY SAID SUPPORT MEANS; A DRIVE CAM CARRIED ON SAID SHAFT AND HAVING A COROTATABLE FREE SLIDING CONNECTION THEREWITH FOR ENABLING REMOVAL OF SAID CAM INDIVIDUALLY, SAID CAM THEREBY BEING A SLIDABLY REMOVABLE MOTOR-DRIVEN CAM, AND HAVING A PERIPHERAL TRACK; A PIN CARRIED BY SAID SUPPORT MEANS IN A MANNER WHERE IT IS SUPPORTED WITH ITS AXIS OFFSET FROM AND PARALLEL TO THE ROTATIONAL AXIS OF SAID CAM, SAID PIN HAVING AN END PORTION PROJECTING FROM SAID SUPPORT MEANS; A DRIVE LINKAGE PIVOTALLY SUPPORTED BY SAID PIN AND ADAPTED TO HAVE A ONE-WAY DRIVE CONNECTION WITH SAID MEMBER; SPRING MEANS URGING SAID DRIVE LINKAGE TO PIVOT TOWARD SAID TRACK; SAID DRIKE LINKAGE INCLUDING AN ARM FREELY SLIDABLY AND INDIVIDUALLY REMOVABLE FROM AND PIVOTALLY SUPPORTED ON SAID END PORTION OF SAID PIN, AND URGED BY SAID DRIVE LINKAGE TO PIVOT TOWARD SAID PERIPHERAL TRACK OF SAID MOTOR-DRIVEN CAM FOR ENGAGEMENT THEREWITH; SAID DRIVE LINKAGE HAVING MEANS NORMALLY ENGAGEABLE WITH SAID SLIDABLY REMOVABLE ARM TO PRECLUDE REMOVAL OF SAID ARM FROM SAID PIN; SAID ARM HAVING A DISTAL END WHICH ENGAGES WITH SAID PERIPHERAL TRACK OF SAID MOTOR-DRIVEN CAM, SAID TRACK INCLUDING A SLOW-RISE PORTION OPERATIVE DURING ROTATION THEREOF TO ACT ON SAID ARM TO PIVOT SAID LINKAGE AND TO SIMULTANEOUSLY STORE ENERGY IN SAID SPRING MEANS, SAID TRACK HAVING A FREE FALL PORTION WHICH ENABLES SAID SPRING TO RELEASE ENERGY RAPIDLY; SAID DISTAL END HAVING AN ELONGATED CAM SURFACE SLIDABLY ENGAGEABLE WITH SAID CAM AT A POINT AT THE END OF SAID PERIPHERAL TRACK AT SAID FREE FALL PORTION FOR LIMITING THE ACCELERATION APPLIED BY SAID LINKAGE TO SAID MEMBER AS ENERGY IS RELEASED FROM SAID SPRING DURING STEP-BY-STEP ADVANCEMENTS THEREOF; AND MEANS REMOVABLY SECURED TO SAID SUPPORT MEANS AND ENGAGEABLE WITH SAID SLIDABLY REMOVABLE MOTOR-DRIVEN CAM AXIALLY TO PRECLUDE REMOVAL OF SAID MOTOR-DRIVEN CAM FROM SAID SHAFT.