| 摘要 |
<p>PURPOSE:To provide the regulating mechanism which has simple constitution and facilitates let-off adjusting operation. CONSTITUTION:A movement restriction rail 40 which is provided in the array direction of a jack 17 and restricts the movement of each jack table 17a when abutting against it is arranged. A screw 45 is thereadably engaged with the top surface of this movement rail 40, and this screw 45 engages a fork screw 29, so that the movement restriction rail 40 is held on a center rail 14. Then, the position of the movement restriction rail 40 can be adjusted by bending the fork screw 29 at right angles. A let-off position can be set by the movement restriction rail 40 instead of a regulating button provided conventionally corresponding to each key.</p> |
