Patent ID: 8157271
Filing Date: 2012-04-17
Classification: B23B,Y10T

Abstract:
1. A floating chuck mechanism provided at a workhead that is arranged at at least one of axial ends of a processing apparatus for sandwiching a cylindrical-shaped workpiece by means of two center members from both the axial ends along a rotational axis on which the center members are arranged so as to face each other, the floating chuck mechanism causing the workpiece to rotate about the rotational axis while holding the workpiece from an outer peripheral side thereof and correcting an eccentricity between the rotational axis and a center of an outer diameter of the workpiece, comprising: a chuck body portion including plurality of clamp jaws for holding the workpiece from the outer peripheral side thereof; a chuck base portion fixed to the workhead so as to rotate therewith, the chuck base portion including a fixed portion fixed to the workhead and a slide portion slidable relative to the fixed portion in a direction perpendicular to the rotational axis along a slide surface extending in directions having components perpendicular and parallel to the rotational axis; and the chuck body portion being fixed to the slide portion and movable therewith along the slide surface so as to correct the eccentricity, wherein said slide portion comprises a first slide portion slidable relative to the fixed portion in a first direction perpendicular to the rotational axis, and a second slide portion slidable relative to the fixed portion and relative to the first slide portion, in a second direction perpendicular to the rotational axis and to the first direction.