Braking device for indexing machine

Claim 1

AN ABRADING MACHINE HAVING AN ABRADING WHEEL AND AN INDEXING TURNTABLE HAVING A SERIES OF STATIONS FOR CARRYING ARTICLES TO BE ABRADED, A SHAFT CONNECTED TO SAID TURNTABLE, AN INDEXING CAM CONNECTED TO SAID SHAFT FOR INDEXING SAID TURNTABLE, SAID INDEXING CAM HAVING A SERIES OF ARCUATE AREAS WITH A COMMON RADIUS AND WITH THE ARCUATE AREAS BEING PERIPHERALLY DISPOSED ABOUT SAID INDEXING CAM, THE INDEXING CAM HAVING A SERIES OF CIRCUMFERENTIALLY SPACED RADIALLY EXTENDING ROLL PASSAGEWAY AREAS SEPARATING THE ARCUATE AREAS FROM ONE ANOTHER, A CIRCULAR PLATE HAVING A RECESSED AREA IN WHICH SAID CAM ROLL PASSAGEWAY AREAS ARE DISPOSABLE DURING THE COURSE OF THE ROTATION OF THE INDEXING CAM AND THE CIRCULAR PLATE, THE CIRCULAR PLATE HAVING A PERIPHERAL SURFACE HAVING THE SAME RADIUS AS THE RADIUS OF THE ARCUATE AREAS FOR PERIODIC ENGAGEMENT TOGETHER TO PREVENT ROTATION OF THE TURNTABLE WHILE THE ABRADING WHEEL FUNCTIONS TO ABRADE AN ARTICLE CARRIED BY SAID STATION, A DRIVE SHAFT CONNECTED TO SAID CIRCULAR PLATE, A CAM ROLL CONNECTED TO SAID DRIVE SHAFT AND DISPOSED IN COAXIAL ALIGNMENT WITH THE RECESSED AREA ON SAID CIRCULAR PLATE WHICH CAM ROLL IS ENGAGEABLE IN SAID CAM ROLL PASSAGEWAY AREAS AT INTERVALS DURING THE COURSE OF THE ROTATION THEREOF FOR INDEXING THE CAM AND THE TURNTABLE, AND BRAKE MEANS COORDINATED WITH THE ROTATION OF SAID SHAFTS FOR BRAKING SAID SHAFT DURING THE PERIODS OF ENGAGEMENT BETWEEN THE PERIPHERAL SURFACE OF SAID CIRCULAR PLATE AND THE ARCUATE AREAS OF SAID INDEXING CAM, THE BRAKE MEANS BEING PROGRESSIVELY RELEASABLE AS SAID CAM ROLL ENTERS EACH OF SAID CAM ROLL PASSAGEWAYS ON SAID INDEXING CAM FOR INDEXING THE TURNTABLE AND BEING PROGRESSIVELY ENGAGEABLE AS SAID CAM ROLL LEAVES EACH OF SAID CAM ROLL PASSAGEWAYS AFTER THE TURNTABLE HAS BEEN SUBSTANTIALLY INDEXED TO MINIMIZE ABRUPTS STARTS AND STOPS.