Lathe provided with eccentricity adjustment mechanism

A lathe provided with an eccentricity adjustment mechanism, the lathe being provided with a workpiece-fixing device on a turntable controlled for rotation or controlled for indexing, and a workpiece fixed by the workpiece-fixing device and rotated or indexed on the turntable being processed using a movement-controlled processing tool, wherein the lathe is characterized in being provided with an eccentricity adjustment mechanism that is provided so as to be capable of moving the turntable in the radial direction with respect to the rotation center and provided so as to be capable of adjusting the eccentricity of the workpiece;

• an axial-direction-movement part that moves in the axial direction being provided on a center shaft of the turntable;
• a pair of linear motion guide units being provided in an engaging part of the center part of the turntable and the axial-direction-movement part of the center shaft;
• one of the pair of linear motion guide units being in inclined state and, due to the axial-direction-movement part of the center shaft being moved in the axial direction, the turntable moving in the radial direction by the radial pressing force generated by the linear motion guide unit being inclined, and the eccentricity of the workpiece being adjusted;
• each of the linear motion guide unit comprises a slide rail and a slide guide, the slide rail is provided to one side represented by either the axial-direction-movement part provided to the center shaft or an engagement-receiving part provided at the center part of the turntable to which the axial-direction-movement part is engaged so as to be capable of moving in the vertical direction, which is the axial direction;
• and the slide guide with which the slide rail is slidably engaged is provided to the other represented side;
• and each of the linear motion guide units, which comprises the slide rail and the slide guide, is provided in the engaging part of the center shaft and the turntable;
• at least one of the linear motion guide units is provided in an inclined state, and, due to the axial-direction-movement part being moved in the axial direction, the radial pressing force is generated in the engagement-receiving part, and the turntable moves radially to become eccentric by an amount that corresponds to the movement stroke of the axial-direction-movement part, and
• each of the linear motion guide units is provided at respective individual engaging parts of the axial-direction-movement part of the center shaft and the engagement-receiving part of the center part of the turntable;
• the pair of linear guide portions comprising one linear motion guide unit and another linear motion guide unit, the one linear motion guide unit, which is provided to the workpiece setting table, is disposed in an inclined state with respect to the other linear motion guide unit, which is vertically provided to the table base, so as to be inclined further radially outward higher up.