| 摘要 |
The arrangement relation between four rows of rollers interposed between a movable block and a track rail and the contact structure of the rollers are elaborated, whereby the rigidity of the movable block with respect to its shape is improved. Two upper rows of rollers (21, 22) are provided in the central portion of the upper surface of a track rail (1) and roller rolling surfaces (61, 62) opposed to the rolers (21, 22) are formed on the upper surface of the track rail (1) and the lower surface of a horizontal portion (4) of the movable block (3). Two lower rows of rollers (23, 24) are provided on left and right side surfaces of the track rail (1), and roller rolling surfaces (63, 64) opposed to the two lower rows of lower are formed on left and right side surfaces of the track rail (1) and inner side surfaces of support leg portions (5, 5) of the movable block (3). The normals (S1, S2) of the roller rolling surfaces opposed to the two upper rows of rollers (21, 22) are inclined at predetermined angles alpha 1, alpha 2 with respect to a vertiline V. The normals (S3, S4) of the roller roll ing surfaces opposed to the two lower rows of rollers (23, 24) are inclined at a predetermined angle with respect to a horizontal line H upward toward the track rail (1)._______________________
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