| 摘要 |
PROBLEM TO BE SOLVED: To automatically carry out aligning and provide a damping property with high rigidity by a barrel shaped roller line in a base part corresponding region between a block main body part and an upper surface of the rail main body part, and a drum shaped roller line between a right and left supporting piece part and right and left half part lower surface of the rail main body part. SOLUTION: A width direction cross sectional surface of a rail main body part 4 is formed in a circular arc shape bent so as to protrude to a lower side, and a circular arc C1 of an upper surface and a circular arc C2 of a lower surface of a right and left half part 41, are constituted in a concentric circle shape around a curvature center O. One line of barrel shaped roller line 12 is disposed in a region corresponding to a base part 5 between a block main body part 6 and an upper surface of the rail main body part 4, and a drum shaped roller line 21 is disposed between a right and left supporting piece part 9 of the rail main body part 4 and a lower surface of a right and left half part 41. High rigidity is realized comparing with that of a ball. Even if a moving block 3 is moved in a circular arc shape, a contact condition of the barrel and drum shaped rollers 13, 22 is not changed, an automatic aligning property is provided. Since diameters of the rollers 13, 22 are different from each other at a center part and both end parts, differential sliding is generated at the time of rolling, and a damping property is improved.
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