| 摘要 |
PURPOSE:To enable the movement of a pointer without backlash by providing at least >=2 pieces of planetary roll consisting of a metallic roll that contact elastically with a sun ring and an outer ring to a pointer mounting body which is fitted loosely to a revolving shaft freely rotatably at an equal space. CONSTITUTION:A sun ring 7 which rotates integrally with a revolving shaft 2 revolves a planetary roll 9, which contacts elastically with the same and an outer ring 8, in the ring 8 while rotating the same, and as the roll 9 revolves, the speed of the shaft 2 is reduced and the revolution thereof is indicated by a pointer 4. The shaft 2 is driven by a motor 1. |
