Patent ID: 6439974
Filing Date: 2002-08-27
Classification: B23B,B23Q,B24B

Abstract:
A driving device for a machine tool which rotatably holds a workpiece between two stationary centers for rotation about a rotational axis, said driving device comprising:a workpiece holder including two adjacent, symmetrically disposed annular spring elements which join at a through opening defined by two prismatic workpiece clamps for holding a workpiece along said rotational axis, each of said prismatic workpiece clamps having a pair of sides merging at a respective point, said workpiece holder also having a pair of longitudinal openings disposed along an axis of said points, each of said longitudinal openings having a respective prismatic end; and a driver for applying a rotational force to said workpiece holder, said driver having a pair of bolts which extend into respective ones of said longitudinal openings of said workpiece holder, each bolt having an end whose shape corresponds to said prismatic end of said its respective longitudinal openings for spreading apart said through opening when said bolts are moved radially outward.