Screw drive method and apparatus

(57) The operation method and equipment of a summary screw drive. The rod (111) with a screw thread in which the screw drive (110) was equipped with the spiral screw thread (112), It has the nut (114) equipped with the load support slot which is established in the surroundings of the rod (111) with a screw thread, and was established in the method of the outside of a radial direction in the state where it aligned with the spiral screw thread (112) after this, and two or more balls (119) prepared between the spiral screw thread (112) and the load support slot. Have a screw drive (110) further and the housing (124) equipped with at least one support bearing (126) this support bearing, It is combined with the inner race (132) and housing (124) which were combined with the nut (114), and has an outer race (134) which can rotate freely to an inner race (132). In order to exert the power which can be adjusted on a support bearing (126) in a direction parallel to the direction axis line of Nagate of a rod (111) with a screw thread as a whole, the holding member (150) is combined with the nut (114), enabling regulation free attachment and detachment and free.