Abstract: An actuator is designed such that the output shaft of an AC servo motor is rotatably supported on both sides thereof by respective bearing means. This output shaft, the rotor of the AC servo motor, secured to the output shaft, and both bearing means of the AC servo motor can be pulled out together as a unit from inside of the stator of the AC servo motor during disassembly. Another actuator is designed such that the output shaft of an AC servo motor is rotatably supported on both sides thereof by respective bearing means, loads to be respectively applied to the bearing means are transmitted to a housing disposed around the AC servo motor without going through the stator of the AC servo motor, one of the bearing means is fixed in its axial direction and the other bearing means has axial play in its axial direction.

Abstract: An actuator comprises a base having a bottom wall and pair of side walls provided upright on right and left sides of the bottom wall, having a transverse cross section of an approximately U shape and form ed by extrusion of a light metal or a light alloy; a slider provided inside the base in such a way as to be movable along the lengthwise direction of the base, made of the same type of light metal or light alloy as that of the base, and having a pair of return paths; a pair of base side grooves formed in inner surfaces of the pair of side walls of the base; a pair of slider side grooves formed in right and left side surfaces of the slider at positions corresponding to the pair of base side grooves, the slider side grooves having a same shape as the base side grooves; a pair of base rails of steel securely attached to the pair of base side grooves and having rolling body tracks; and a pair of slider rails of steel securely attached to the pair of slider side grooves and having rolling body tracks which commun

Abstract: An actuator designed in such a way that a feed screw having both ends respectively supported in a rotatable manner by a pair of bearing members arranged on a base is moved in the proper direction by a rotary driver, and as a feed nut engaged with the feed screw with its rotation being restricted by the feed screw is moved in accordance with the rotation of the feed screw, a slider attached to the feed nut is moved. A pair of support members are provided midway between the slider and the bearing members located on both sides of the slider and are movable in a feeding direction. The support members support the feed screw while their postures are restricted in a direction perpendicular to the feeding direction. The support members are coupled by first coupling means. Rotary bodies are respectively attached to the support members in a rotatable manner, with a thread member put around those rotary bodies. The thread member has both ends coupled to the slider and has its center portion secured to the base.