Automatic precision control for cutting and grinding of diamonds

Claim 1

IN A GEM FACETING DEVICE INCLUDING A WORK SURFACE HAVING A HORIZONTALLY DISPOSED GEM FINISHING WHEEL THEREON AND AN INDEPENDENT GEM HOLDER INCLUDING A GENERALLY HORIZONTALLY DISPOSED TONG HAVING A TONG SUPPORT AT ONE END AND GEM GRIPPER MEANS AT THE OTHER END, A TONG CONTROL MEMBER COMPRISING, A HOUSING, A STUD MEMBER GENERALLY VERTICALLY EXTENDING FROM SAID HOUSING AND HAVING A LATERALLY PROJECTING ARM PORTION NORMALLY LYING IN A PLANE ABOVE THE UPPER SURFACE OF SAID TONG, FIRST SPRING MEANS ENGAGING SAID STUD AND NORMALLY URGING SAID ARM OUT OF REGISTRY WITH SAID TONG, POWERED MEANS OPERATIVELY ASSOCIATED WITH SAID STUD AND SHIFTABLE TO ACTUATED AND RELEASED POSITIONS THEREOF, SAID LAST NAMED MEANS BEING ADAPTED, UPON ACTUATION THEREOF, TO SHIFT SAID ARM OF SAID STUD INTO ENGAGEMENT WITH SAID UPPER FACE OF SAID TONG, AND SECOND SPRING MEANS COCKED BY ACTUATION OF SAID POWERED MEANS RESILIENTLY URGING SAID ARM DOWNWARDLY AGAINST SAID TONG WHEN SAID POWERED MEANS IS IN THE ACTUATED POSITION THEREOF.