Geneva-type transmission

Claim 1

AN INDEXING-TYPE DRIVE COMPRISING AN OUTPUT SHAFT, A SLOTTED GENEVA WHEEL CONNECTED TO ROTATE SAID SHAFT, AN INPUT SHAFT MOUNTED IN SPACED RELATIONSHIP WITH THE AXIS OF ROTATION OF SAID GENEVA WHEEL, MEANS FOR ROTATING SAID INPUT SHAFT AT CONSTANT SPEED, A MEMBER ATTACHED TO SAID INPUT SHAFT FOR ROTATION WITH THE LATTER, A DRIVER ENGAGEABLE WITH THE GENEVA WHEEL AND MOVABLE AXIALLY IN ITS SAID SLOTS, MEANS SHIFTABLY CONNECTING THE DRIVER FOR RADIAL MOVEMENT ON SAID MEMBER AND INCLUDING A FOLLOWER MEMBER, AND ANNULAR GUIDE MEANS DEFINING AN ENDLESS PATH FOR ENGAGING SAID FOLLOWER MEMBER TO CONTROL RADIAL MOVEMENT OF THE DRIVER ON SAID MEMBER, THE CENTER LINE OF SAID PATH OF THE ANNULAR GUIDE MEANS AT THE POINT OF ENGAGEMENT OF SAID DRIVER WITH ONE OF SAID SLOTS OF THE GENEVA WHEEL CORRESPONDING WITH THE LONGITUDINAL RADIAL AXIS OF SAID SLOT, AND THE DRIVER BEING BROUGHT TO THE SAID SLOT SO THAT AT SAID POINT OF ENGAGEMENT THE DRIVER HAS SUBSTANTIALLY ZERO VELOCITY AND ACCELERATION TRANSVERSELY TO SAID LONGITUDINAL AXIS OF SAID SLOT, AND SAID PATH OF THE ANNULAR GUIDE MEANS BEYOND SAID POINT OF ENGAGEMENT BEING CHARACTERIZED BY MOVING THE DRIVER TO PRODUCE A FINITE RATE OF CHANGE OF ANGULAR ACCELERATION OF SAID WHEEL SUBSTANTIALLY DURING ITS INDEX.