| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of an edge tool damage or the like in a shaft main body when the end part of a synthetic resin is cut off and to also prevent the adhesion and remaining of a resin on the shaft main body. SOLUTION: In integrally forming a synthetic resin layer 11 compounded with a magnetic powder around the periphery of the shaft main body 3 by injection molding, the synthetic resin layer 11 is formed so as to protrude from both end edges of the shaft main body 3, and the inner peripheral surface 11a of the synthetic resin layer 11 is positioned so as to be spaced apart from the perpheral surface of the shaft main body 3 between the position in the vicinity of each of the end edges 3a of the shaft main body 3 and each of the end edges 3a. |
