| 摘要 |
PROBLEM TO BE SOLVED: To easily execute the fine adjustment by canceling the force to be applied to a screw to be adjusted, using another clearance adjustment screw existing at the same side when observed from a center, as a stopper, and preventing the sudden change of the frictional force in the unscrewing of a clearance adjustment screw. SOLUTION: At first, a clearance adjustment screw 12b is fastened until the clearance to a track base does not exist for unscrewing a clearance adjustment screw 12a. By this operation, the force to be applied to the clearance adjustment screw 12b from the track base can be reduced, and the static frictional force of the screw is reduced. Then the clearance adjustment screw 12a is unscrewed. On this occasion, as the clearance adjustment screw 12b acts as a stopper, the clearance adjustment screw 12a can be lightly unscrewed, and further the sudden application of the force to the unscrewing direction immediately after the unscrewing can be prevented. Finally, the track base 12 is stopped at a position where it is contacted with the clearance adjustment screw 12a by unscrewing the clearance adjustment screw 12b.
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