Structure for punching machine

Claim 1

A STRUCTURE FOR ACCURATELY ANGULARLY ORIENTING A SHAPED TOOL WITH RESPECT TO A WORKPIECE, COMPRISING IN COMBINATION: (A) A RIGID FRAME CONSTRUCTED TO BE INSTALLED IN AND REMOVED FROM A PRESS AS A UNIT AND HAVING RELATIVELY FIXED UPPER AND LOWER ARMS, SAID ARMS RESPECTIVELY HAVING VERTICALLY FIXED MEANS DEFINING A PAIR OF SPACED ALIGNED APERTURES; (B) A PAIR OF VERTICALLY-SPACED UPWARDLY-OPEN CONCENTRIC ANNULAR MEMBERS RESPECTIVELY SUPPORTED BY SAID ARMS IN SAID SPACED ALIGNED APERTURES IN VERTICALLY FIXED POSITIONS AND EACH ROTATABLE THEREIN, AND EACH OF SAID MEMBERS HAVING MEANS RESPECTIVELY DEFINING A BORE SLIDABLY RECEPTIVE FROM ABOVE OF SEPARATE COOPERATING TOOLS COMPRISING PUNCH AND DIE MEANS OF NONCIRCULAR CROSS-SECTION, ONE OF SAID BORE-DEFINING MEANS FURTHER ENABLING ONE OF SAID TOOLS TO BE VERTICALLY RECIPROCATED WITH RESPECT TO THE ASSOCIATED VERTICALLY FIXED ANNULAR MEMBER; (C) SAID ROTATABLE ANNULAR MEMBERS EACH HAVING RADIALLY INWARDLY EXTENDING KEYING STRUCTURE OPERATIVE BETWEEN EACH ANNULAR MEMBER AND THE TOOL SUPPORTED BY IT TO EFFECT COROTATION WITH SUCH SUPPORTED TOOL WHILE ENABLING THE RELATIVE VERTICAL MOVEMENT OF THE ONE OF SAID TOOLS AND SLIDABLE RECEPTION OF BOTH OF SAID TOOLS; AND (D) SELECTIVELY EFFECTIVE LOCKING MEANS FOR EACH OF SAID ANNULAR MEMBERS, SAID LOCKING MEANS BEING RESPECTIVELY OPERATIVE BETWEEN SAID FRAME AND SAID ANNULAR MEMBERS TO LOCK SAID ANNULAR MEMBERS IN ANY SELECTED ROTATIONAL POSITION WITH RESPECT TO SAID FRAME.