| 摘要 |
<p>PURPOSE:To prevent the occurrence of wear between a driving ring and a bearing through elimination of the bearing, by a method wherein two U-shaped levers, positioned facing each other, are coupled to a driving ring, and a lever, not coupled to the driving ring, is supported at a fulcrum. CONSTITUTION:When a force A is exerted on a projected part 13a of a driving ring 1 by means of an actuator 2, the force A is exerted on a lever 121. Simultaneously, the force A in a direction reverse to that of a force on the lever 121 is exerted on a lever 123 centering around a fulcrum 14 at which a lever 122 is supported. Despite of that the force of an actuator 2 is converted into a vertical force A by means of the levers 121 and 123 of a regulating link 11 to exert it on the driving ring 1, the vertical force of the driving ring 1 is balanced. When the force A is exerted on the driving ring 1, the force A is exerted on a lever 121' of a regulating link 11'. Simultaneously, the force A in a direction reverse to that of a force on the lever 121' is exerted on a lever 123'.</p> |
