| 摘要 |
PROBLEM TO BE SOLVED: To make the height of a height position regulated freely, to solve a problem of unsatisfactory operability when the height position of a crosshead or a yoke with respect to a machine table is fixed and high. SOLUTION: Both screw rods 3L, 3R are screwed in by such a manner that the screw rod 3R is screwed in with a support nut 25R held rotatably to the machine table 1 via a roller bearing 26, as shown in the screw rod 3R. In the other hand, a V-belt 24 wound to a pulley 22 attached to an output shaft of an electric motor 21 is wound onto the support nuts 25R, 25L. The both support nuts 25R, 25L have the same size, and the both screw rods 3L, 3R are also the same diameter and the same screw pitch. When the both support nuts 25R, 25L are rotation-driven by rotation of the motor 21, the both screw rods 3L, 3R are synchronizedly rotated thereby to be displaced along an axial direction (vertical direction), because the both support nuts 25R, 25L are fixedly maintained in a longitudinal direction of the screw rods 3L, 3R with respect to the machine table 1. COPYRIGHT: (C)2004,JPO
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