| 摘要 |
<p>PURPOSE:To restrain sound pressure by supporting a drive shaft on two portions with synthetic resin bearing parts centered accurately with each other. CONSTITUTION:Upper and lower bearing parts 3, 4 are provided in the upper and lower portions of a vertically long tubular bearing base body 2 formed of a synthetic resin having a satisfactory sliding property, while a large diameter part 5 having the diameter larger than that of the bearing parts 3, 4 is provided between bearing parts 3, 4 in the bearing base body 2. A case body provided with a drive mechanism is also provided integrally with the bearing base body 2 in which a drive shaft 1 is inserted and supported with the upper and lower bearing parts 3, 4. The lower end of the drive shaft 1 is fixed to a drive lever provided in the case body for rolling.</p> |
