TAILSTOCK DEVICE FOR SUPPORTING AND/OR CENTERING A WORKPIECE

The invention relates to a tail stock device (10) for supporting a workpiece in a machine tool, for example a grinding machine. The tail stock device (10) comprises a tail stock arm (16) that is pivotally supported about a pivot axis (S), said tail stock arm having arranged on its outer end (16a) a centering tip (12) that is oriented parallel to the pivot axis (S). By means of a pivot drive (30) comprising a first pneumatic cylinder (31), the tail stock arm 16 can be pivoted between a working position (A) and a resting position (R). The movement of the piston (32) of the first pneumatic cylinder (31) is transmitted-via a first coupling arrangement (35)-to the tail stock arm (16). When the tail stock arm (16) is in working position (A), the first coupling arrangement (35) assumes a self-locking position in which a force feedback effect being triggered by a torque that forces the tail stock arm (16) out of working position (A) and into resting position (R) does not or only minimally retroact on the piston (32) of the first pneumatic cylinder (31).