| 摘要 |
PROBLEM TO BE SOLVED: To reduce the abrasion of bearings by applying elasticity to at least one bearing. SOLUTION: A bearing 24 has a sleeve shape, and it is opened at one end section 42 and closed at the other end section 46 on the opposite side. The outer peripheral section of the opened end section 42 of the bearing 24 is provided with a widened edge section 25, and the edge section 25 has an inclined face to be easily inserted into the hole of a holder. The bearing 24 is formed into a cylindrical shape, it has two regions different in diameter, and the region having a larger diameter is extended over the whole length of the bearing 24. The region having a smaller diameter is located inside the region having the larger diameter, and it is connected to the region having a larger diameter via a portion 50 having a folded cross section. Elasticity can be applied to at least one bearing 24, the rolling friction of the bearing 24 supporting a roller can be reduced, and abrasion can be eliminated. |
