MAGNETIC SCREW CONVEYANCE STRUCTURE AND OPENING/CLOSING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a highly reliable magnetic screw structure hardly deflected with a clean screen, which holds accurately a nut and a shaft and does not cause dusting problem or the like even in a long time use. SOLUTION: The conveyance structure is constituted of combination of a nut 1-2 composed of a cylindrical and straight magnetic body shaft 1-1' in which a nonmagnetic part is spirally formed and of a magnet disposed oppositely apart from the shaft by a specified distance and having a spiral magnetic pole so as to form a magnetic circuit. In the magnetic screw structure getting the axial thrust by the relative rotation with the shaft or the nut, a relatively longitudinaly movable slide bearing 1-2-1, while securing a relative distance from the shaft, is built in the nut.