| 摘要 |
PROBLEM TO BE SOLVED: To provide a roller unit for preventing a deformation resulting from a bearing arranged at both ends of the lengthwise direction. SOLUTION: A winding pitch P1 of a coil spring 60 in a part where a bearing 56 is located is made shorter than a winding pitch P2 of a coil spring in a part where the bearing 56 is not located out of an external wall surface 52b of a cored bar. Therefore, the winding pitch P1 of lengthwise body ends 62 and 62 of the coil spring 60 is made shorter than the winding pitch P2 of a lengthwise center 64. Then, the lengthwise both ends of the external surface 52 is pressed outwards with the force stronger than that of the lengthwise center. COPYRIGHT: (C)2004,JPO
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