| 摘要 |
<p>PURPOSE:To surely make the coaxial fixing of a thrust bearing member and to reduce whistling sound by guiding the outer periphery of thrust bearing member and also providing a cover member coating the through-hole of a rotary drum. CONSTITUTION:After an upper cylinder 64 is placed on a disk 60 and a wiring connection is made thereon, the cover member 90 consisting of resin molded goods is pressed into the outer periphery 68 of disk 60 through a protrusion 92. The thrust bearing member 62 is thereby guided to a guide part 96 and fixed on the disk 60. Since the outer diameter d1 of member 62 is made to have the relation of d2<d1 to the inner diameter d2 of a fitting part 94 of member 90, the member 90 is never fallen off. By this constitution, the sound through wind blow is never carried up to a microphone, and the member 62 can be fixed without deviation.</p> |
