Patent ID: 8061227

Claim:
A small slider unit, comprising: a rail; a slide table movable on the rail; a screw shaft coupled to the slide table and situated parallel to the rail; a motor for rotating the screw shaft; a coupling member for providing the coupling between a rotating shaft of the motor and the screw shaft; and a bearing supporting the screw shaft, arranged so that when the screw shaft is rotated by the motor, the screw shaft moves the slide table, wherein a leading end of the screw shaft closer to the motor is fixedly press-fitted into a cap member supported by an inner ring of the bearing, wherein the cap member has a hole, and the leading end of the screw shaft is fixedly press-fitted into the hole, wherein the cap member has one end that serves as an insertion opening into which the screw shaft is inserted and at which a flange is formed and placed into contact with one end of the inner ring of the bearing, wherein the other end of the cap member is inserted into the coupling member and pressed and secured to the coupling member by a screw, wherein the rotating shaft of the motor is inserted through one end of the coupling member located farther from the cap member into the coupling member and is pressed and secured to the coupling member by a screw, and wherein the other end of the coupling member comes into contact with the other end of the inner ring of the bearing, wherein the other end of the coupling member and the flange of the cap member are pressed directly against the bearing, so that the bearing is held between the other end of the coupling member and the flange.