| 摘要 |
PROBLEM TO BE SOLVED: To provide a bobbin capable of saving the weight and retaining strength against a torsional stress.SOLUTION: A bobbin 10 has at least its trunk part 2 and flange part 4 made of resin members and its main shaft 1 made of a metal, and a metallic flange 5 is jointed to the end part of this main shaft 1, so that torque at the time of stopping the rotation around the main shaft 1 is received by the flange 5. It is preferred that the flange 5 and the main shaft 1 are jointed by involute serration or welding. |
