| 摘要 |
PURPOSE:To obtain a magnetic screw having high magnetic force and mechani cal strength, by providing an inner magnetic screw with a high permeability rod member which continuouly arranges a plurality of inner spiral cylinder magnets having spiral magnetization, in the axial direction on the outer periph eral surface of permanent manget material formed in a small length cylindrical form, and retains the inner spiral cylinder magnets. CONSTITUTION:In the ordinary time of a magnetic screw, magnetizat belts 9 of mutually attracting polarities of spiral cylinder magnets 4 and 7 are stopped in a facing position, by the magnetic force of the spiral cylinder magnet 4 of a shaft body 1 and the spiral cylinder magnet 7 of a housing 2. When the shaft body 1 is rotated with a motor M, the cylinder magnet 4 rotates together with a rod member 3, and a mangetization belt 9 shows spiral advance. The cylinder magnet 7 which can not rotate around the rod member 3 is going to follow. Since a force does not act especially in the axial direction and neutral in a subhole 32, the housing 2 moves right and left together with the spiral advance of the magnetization belt 9, in accordance with the rotation of the rod member 3. |
