| 摘要 |
PROBLEM TO BE SOLVED: To prevent a pair of roller holders from being asymmetrically deviated. SOLUTION: This device is provided with a guide box 101, a pair of the roller holders 102 which are attached to the guide box rotatably around a fulcrum shaft, guide rollers 104 which are provided at the top end part of each roller holder provided with a 1st roller holding shaft 105 as the center of rotation and center-to-center dimension adjusting mechanisms 109 for adjusting the respective distances between both centers of the guide rollers. The center-to- center dimension adjusting mechanism 9 is provided with an adjusting pinion 112, an adjusting shaft 118 arranged at the rear end part of each roller holder, a gear wheel 115 provided at the upper part of the adjusting shaft and engaged with an adjusting pinion and plural holding bolts 108 passing through the rear end part of each roller holder in the direction orthogonal to the length direction of the roller holder. Each holding bolt is arranged at a certain interval in the vertical direction, and holds the roller holder by allowing its top end part to abut on the adjusting shafts 118, thereby suppressing the roller holders applied with the load at the time of introducing guidance from being asymmetrically deviated.
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