| 摘要 |
PURPOSE:To contrive simplification of assembly and reduction of a number of parts and to prevent a function of a clutch from deteriorating, by so constituting that a second component made of synthetic resin is pinched elastically in an elastic beam part formed, together with a first component in a body, of synthetic resin. CONSTITUTION:Four elastic beam parts 11 are formed of synthetic resin on the inner face of a driven gear 6 in a body and the elastic beam parts are made to possess a spring function. A zoom ring 4 is mounted on the driven gear 6 by making the zoom ring 4 hold by pinching by the elastic beam part 11 through repulsive force of the elastic beam part 11. As the driven gear 6 and the spring beam part 11 are formed in a body like this, a reduction of a number of parts and simplification of assembly can be realised. The external circumferential surface of the zoom ring is not scraped off by the spring beam part and preciseness of a function of a clutch does not deteriorate as both the spring beam part 11 and the zoom ring 4 are formed of synthetic resin. |
