| 摘要 |
<p>A plurality of guide members (16a, 16b) are provided in a plurality of guide holding members (15a, 15b) which are capable of reciprocating approximately perpendicular to the movement direction of a straight movement structural body (12) that is capable of reciprocating with respect to a base member (11). There are provided swing devices (35a, 35b) which are installed at the end of a straight movement member (33) capable of reciprocating in a direction approximately parallel to the movement direction of the guide holding members (15a, 15b) and which are swingable about an axis approximately perpendicular to the movement direction of the straight movement structural body (12) and to that of the straight movement member (33). Part of the aforementioned guide members (16a, 16b) come into contact with the aforementioned swing devices (35a, 35b). Three (3) or more displacement generation mechanisms (22a, 22b, 22c) which cause part of the guide holding members (15a, 15b) to undergo relative displacement are subjected to operational control, thereby changing the transmission gear ratio between the displacement rate of the straight movement member (33) and that of the straight movement structural body (12).</p> |
