| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate adjustment and to improve reproducibility, by providing a display means which is connected by an eccentric pin so that a first plate and a second plate relatively move when the eccentric pin rotates, and displaying the rotation position of the eccentric pin. SOLUTION: When an eccentric pin 31 is in the prescribed rotation position, the rotation position can be learnt by the value of a scale 34 which a positioning mark 36a shows. Namely, the scale 34 and the positioning mark 36a are equivalent to the display means. Groove parts 35 to which the ball of a ball plunger 39 is engaged are discretely arranged at every prescribed angles. Thus, the rotation position of the eccentric pin 31 can be progressed at prescribed steps and the rotation position can be regulated to one of the values decided by the arrangement of the groove parts 35.</p> |
