Rotary indexing head

Claim 1

AN INDEXING HEAD FOR ACCURATELY INDEXING A SHAFT RELATIVE TO ITS SUPPORT, SAID INDEXING HEAD COMPRISING A FRAME, AN INDEXING WHEEL IN THE FORM OF A PRECISION GEAR MOUNTED FOR AXIAL ROTATION UPON SAID FRAME, MEANS FOR FIXEDLY SECURING A SUPPORT FOR A SHAFT RELATIVE TO SAID FRAME, MEANS FOR COUPLING TO SAID INDEXING WHEEL FOR CONJOINT ROTATION A SHAFT SUPPORTED BY SAID SUPPORT, A CARRIAGE MEMBER MOUNTED ON SAID FRAME FOR MOVEMENT ADJACENT THE PERIPHERY OF SAID INDEXING WHEEL, CONTROL MEANS FOR DETERMINING THE MOVEMENT OF SAID CARRIAGE MEMBER, A SLIDE BLOCK MOUNTED ON SAID CARRIAGE MEMBER FOR PARALLEL MOVEMENT RELATIVE THERETO, AN INDEXING BLOCK CARRYING A TOOTHED RACK, ADJUSTABLE MEANS JOINING SAID INDEXING BLOCK TO SAID SLIDE BLOCK IN A MANNER PERMITTING SELECTIVE TANGENTIAL OPERATIVE ENGAGEMENT OF SAID RACK WITH THE TEETH OF SAID INDEXING WHEEL, THE MOVEMENTS OF SAID CARRIAGE MEMBER AND SAID SLIDE BLOCK PARALLELING THE LINE OF SAID TANGENTIAL ENGAGEMENT, A CALIBRATED MICROMETRIC ADJUSTMENT MEMBER CARRIED BY SAID CARRIAGE MEMBER FOR MICROMETRIC POSITIONING OF SAID SLIDE BLOCK RELATIVE TO SAID CARRIAGE MEMBER, AND AN INDICATOR CARRIED BY SAID INDEXING BLOCK FOR COOPERATING WITH INDICIA ON SAID INDEXING WHEEL, SAID INDICIA DEFINING EQUI-ANGULAR INCREMENTS OF SAID INDEXING WHEEL WHICH ARE EQUAL TO A GIVEN MULIPLE OF THE CIRCULAR PITCH OF THE TEETH THEREON.