| 摘要 |
PROBLEM TO BE SOLVED: To prevent the scatter and fall of a lubricant from a screw sliding part so as to generate no restriction on linear moving stroke by providing an oil retaining cover structure for covering an opening part in association with linear movement of an external transmission block for transmitting linear converted driving force to the outside. SOLUTION: External scatter preventive covers 10a, 10b are provided being locked to the right and left sides of a body frame cover 80 so as to cover an opening part 85 but not to interfere with linear movement of an external transmission block 35. At this time, covers are formed into such structure as to overlap-cover the opening part 85 as much as possible with the covers 10a, 10b and a screw part oil retaining cover 38. In order to prevent the generation of scatter from a vertical step difference part 86 between the covers 10a, 10b, a step difference space is narrowed. The scatter of a lubricant from the opening part 85 generated before and after the passage of a block 35 can therefore be prevented by a large margin in cooperation with the oil retaining cover 38. As a result, the scatter and fall of the lubricant from a screw sliding part is prevented so as to generate no restriction on linear moving stroke.
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