Abstract: A hoisting system for an elevator which can reduce the weight of a traction type elevator system by including a pressing roller for pressing the rope against the outer circumferential surface of the sheave, the pressing roller being rotatably supported on a non-rotational member and having a pressing means for pressing the roller against the rope, the pressing roller in its outer circumference having an arc-like groove which is brought into engagement with the rope, the outer circumference of the pressing roller being made of an elastic material, the pressing roller being constituted by at least a pair of pressing rollers which are disposed substantially symmetrically relative to a rotating center of the sheave, and the pressing roller being movable relative to the rope and including a belt wrapped between the pair of pressing rollers, whereby the pair of pressing rollers press the rope against the outer circumferential surface of the sheave via the belt wrapped between the pair of pressing rollers.

Abstract: A spindle device with a built-in motor comprises a casing, a working spindle having a large radius portion formed with a bore and a small radius portion extending from the large radius portion, the large radius portion being housed in the casing, and the small radius portion protruding from the casing and having a working tool mounted thereon, a cylindrical motor rotor attached to an inner surface of the large radius portion of the working spindle, a fixed shaft provided in the casing and loosely inserted into the motor rotor, and a motor stator mounted on an outer surface of the fixed shaft opposed to the motor rotor. The casing is formed with an air passageway having a plurality of injection nozzles which are open at an inner surface of the casing opposed to an outer surface of the large radius portion of the working spindle.

Abstract: A machining center in which the moment exerted on a support base and support table during a machining operation is remarkably reduced. The machining apparatus includes a pair of guide rails extending in the longitudinal direction relative to the workpiece upon which the machining head is slidably supported either directly or via a table. The rear one of this pair of guide rails is made higher than the other guide rail, thereby reducing the reaction forces exerted upon the upper surfaces of the guide rails, and hence the moment exerted on the supporting base.