| 摘要 |
PURPOSE:To absorb an impact force doubly with a simple structure by providing 1st and 2nd buffers for absorbing the impact force of a projection and providing a gap between an output gear projection and the 2nd buffer. CONSTITUTION:A 1st buffer 20 is composed of an elastic body and fitted by forming a recessed part like groove under a cover 15. 2nd buffers 21, 22 are fixed by an adhesive, etc. to the face under the cover 15. When a bearing 24 is rotated in the state of its inserting to the engaging part 23 for bearing, a projection 19 is first abutted to the 1st buffer 20. At this time, the 1st buffer 20 absorbs the impact energy with contracting. The residual energy not absorbed up is absorbed by the 2nd buffer 21 with its contracting with the projection 19 of an output gear being abutted to the 2nd buffers 21, 22 because of the 1st buffer 20 being contracted. The impact force can thus be absorbed twice with a simple structure. |
