Work piece transfer device

Claim 1

A WORK PIECE TRANSFER DEVICE FOR MOVING A WORK PIECE ALONG A RECTILINEAR PATH, COMPRISING A BASE MEMBER, A PRIMARY CARRIAGE SUPPORTED ON SAID BASE MEMBER FOR ROTARY MOVEMENT ABOUT A FIRST AXIS, A SECONDARY CARRIAGE SUPPORTED ON SAID PRIMARY CARRIAGE FOR ROTARY MOVEMENT ABOUT A SECOND AXIS PARALLEL TO SAID FIRST AXIS, A PAIR OF COACTING WORK PIECE TRANSFER JAWS PIVOTALLY MOUNTED ON SAID SECONDARY CARRIAGE AND BEING FORMED WITH WORK PIECE HOLDING PORTIONS HAVING THE CENTER THEREOF LOCATED A DISTANCE FROM SAID SECOND AXIS EQUAL TO THE DISTANCE BETWEEN THE FIRST AND SECOND AXES, MEANS FOR ROTATING SAID PRIMARY CARRIAGE ABOUT SAID FIRST AXIS, MEANS INTERCONNECTING SAID BASE MEMBER WITH SAID SECONDARY CARRIAGE WHEREBY ROTATION OF SAID PRIMARY CARRIAGE CAUSES THE SECONDARY CARRIAGE TO ROTATE SO THAT THE CENTER OF SAID WORK PIECE HOLDING PORTIONS RECIPROCATES ALONG A STRAIGHT LINE PASSING THROUGH SAID FIRST AXIS, A CAM FOLLOWER, MEANS ON SAID SECONDARY CARRIAGE SUPPORTING SAID CAM FOLLOWER FOR MOVEMENT BETWEEN A FIRST AND SECOND POSITION, A CAMMING MEMBER SUPPORTED BY THE PRIMARY CARRIAGE AND COOPERATING WITH SAID CAM FOLLOWER FOR MOVING THE LATTER BETWEEN SAID POSITIONS DURING A PORTION OF THE ROTATIVE CYCLE OF THE PRIMARY CARRIAGE, OVERLAPPING SLOTS FORMED IN SAID JAWS, AND A PORTION OF SAID CAM FOLLOWER LOCATED IN SAID SLOTS SO THAT MOVEMENT OF THE CAM FOLLOWER BETWEEN THE FIRST AND SECOND POSITIONS CAUSES THE JAWS TO OPEN AND CLOSE RESPECTIVELY.