Abstract: A two screw double-stroke and screw differential-motion mechanism is applied in a standard mechanical interface. The two mechanisms are utilized for the correlation of transmission between screws and nuts and the screw differential-motion, so as to achieve more efficient positioning and clamp retrieval and placement.

Abstract: Apparatus embodying the invention includes first and second motors coupled to a carriage assembly for moving the carriage assembly back and forth between first and second end points. The first motor is for developing a force to drive the carriage in one direction and the second motor is for developing a force to drive the carriage in an opposite, second direction. When the first motor causes the movement of the carriage in one direction, the slowing, stopping and reversal of the carriage is achieved by varying the power supplied to the second motor relative to the power supplied to the first motor until the force exerted by the second motor first equals and then exceeds the force exerted by the second motor. So operated, the carriage motion is well controlled and exhibits little, if any, backlash.

Abstract: Rotary motion of a ball screw is converted by a feed nut into rectilinear motion to allow a displacement mechanism to make rectilinear motion. When the ball screw involves axial deviation, then an engagement member slides in a direction of the arrow C with respect to a nut holder by the aid of a first guide mechanism, and a second sliding guide slides in a direction of the arrow B with respect to the engagement member by the aid of a second guide mechanism. Accordingly, even when the ball screw involves axial deviation with respect to the second sliding guide, the sliding resistance is not increased between the second sliding guide and a frame of an actuator. Therefore, even when there is any axial deviation between the ball screw and the frame, there is no fear of obstructing the displacement action of a displacement member.

Abstract: A slide guide unit wherein the nut member for applying a driving force to the slider and a sliding contact member for supporting the slider in motion with respect to the track rail are firmly fixed to the slider and which may be manufactured simply at low cost without increasing the number of components. The slide guide unit is characterized in that the slider is composed of a metallic core block having a mounting surface for a movable body and a resin portion built around the core block by molding, and in that the sliding contact member in sliding contact with the track rail and the nut portion in which the screw shaft is screwed are formed in a single resin piece.

Abstract: The linear guide apparatus includes a guide rail 3 including a rolling body rolling groove 8 and a friction apply unit 6 assembled to the guide rail 3. The friction apply unit 6 includes a unit main body 15, a brake member 16, an oil pressure cylinder 17 and a plate spring 32. The brake member 16 is disposed so as to face the side surface 3a of the guide rail 3 and can be contacted with the other portions of the side surface 3a than the rolling body rolling groove 8 thereof. The oil pressure cylinder 17 includes a piston member 20 which is structured to be driven in a positive direction to thereby press the brake member 16 against the side surface 3a of the guide rail 3 and also the piston member 20 can be driven in the opposite direction to thereby remove the pressure of the brake member 16 from the side surface 3a.