| 摘要 |
PROBLEM TO BE SOLVED: To prevent a ceramics roller 12 from generating damage caused by a tightening pressure in a combined roller 10 in which the ceramics roller 12 engaged on a support shaft 11 made of metal is tightened and clamped by a receiving part 11b provided on one end of the support shaft 11 and a tightening nut member 13 made of metal and thread-mounted to the other end thereof. SOLUTION: A ratio of an axial width L and a radial thicknessΔD (thicknessΔD/width L) of a tightening nut member 13 is set toΔD/L<=1.5.
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