| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of damage and seizure on sliding surfaces by performing working so that a distance between sliding surfaces at the lower tip parts of a pair of guide bars may be smaller than a distance at the upper tip parts, compressing a frame by a tightening with a tie-bolt or the like and making a distance between the sliding surfaces uniform over the entire length of the guide bars. SOLUTION: When a frame 2 and guide bars 10, 10 are worked, sliding surfaces 10a of guide bars 10, 10 are worked so that the lower tip parts of the guide bars 10, 10, that is, a width X at a location corresponding to a bottom part of a notch 2b of the frame 2 may be smaller than the upper tip parts of the guide bars 10, 10, that is, a width W at a location corresponding to an upper tip surface 2c of the frame 2 at first. when a tie-bolt is tightened, the frame 2 expands a lower part 2a forming the notch 2b in left and right direction by the tightening force, as shown by a broken line, and a distance of the guide bars 10, 10 at the lower tip parts becomes Y. In this case, since a distance X before the tie-bolt is tightened is set so that the distance Y after the tie-bolt is tightened may be the same as the distance W at the upper tip part, the distance of the sliding surfaces 10a becomes the same over the entire length. |
