| 摘要 |
<p>PURPOSE: To maintain the concentricity of spring seat members within a critical tolerance by engaging the moving end of an elastic member with an adjusting member movably and constituting the adjusting member from two segments. CONSTITUTION: A predetermined pressing force is applied on a spring seat member namely an adjusting member 80 by a compressive coil spring namely an elastic member 88, and the control member 80 consists of control members 81, 83. An end of the elastic member 88 is movably engaged with an annular shoulder 105 on the underside of the body 101. The adjusting members 81, 83 are engaged with each other, and when the members are screwed into a magnetic pole member 62 by turning the control member 81, the spherical downstream end 109 abuts on the planar upstream end 107, and the elastic member 88 is compressed. Hence, the concentricity of the constituting member needs not be adjusted within a critical tolerance.</p> |
