Abstract: An apparatus for loading and unloading a workpiece between a working position of a machine tool and a waiting position provided outside the machine tool. The apparatus comprises a rotational shaft which is supported to be rotatable about its axis extending in parallel with an axis of a work spindle, and is rotated in a clockwise direction or a counterclockwise direction within a required rotational angle by an actuator. On a bracket fixed on one end of the rotational shaft, there are installed a loading arm unit and an unloading arm unit. The loading arm unit and the unloading arm unit are arrayed in a direction of the axis of the work spindle, and extend in an up-and-down direction along a pair of lines, which intersect with each other at a predetermined angle so as to interact at the working position, respectively. Each of the loading arm unit and the unloading arm unit has a pair of gripping claws extending in a direction which is normal to the axis of the work spindle.

Abstract: A tailstock device for a grinding machine including a pilot shaft rotatably and axially movably supported by a tailstock base, a tailstock body fixedly supported on the pilot shaft, a center carried on the tailstock body in parallel relationship with and upwardly of the pilot shaft for supporting one end of a workpiece to be ground by a grinding wheel, a spring member for urging the pilot shaft and the center toward the workpiece, a dressing tool adjustably supported on the tailstock body at the rear of the center to be movable in a direction perpendicular to the axis of the center for dressing the grinding wheel, a mechanism for adjusting the position of the dressing tool so as to bring the tip of the dressing tool into a position corresponding to the finish surface of the workpiece, and a taper adjusting mechanism for adjustably swinging the tailstock body about the pilot shaft to adjust the angular position of the center.