| 摘要 |
<p>PURPOSE: To switch a support easily while accelerating or decelerating by providing a speed varying mechanism for accelerating the rotational speed of the support gradually from initial state to a maximum speed and then decelerating the rotational speed gradually. CONSTITUTION: At the time of switching from a rail track 203 to a rail track 204, a link part 14 turns by 90 deg. about a rotary shaft 8 on the link ball 15B side when the link part 14 turns by 180 deg. about a rotary shaft 9a on the link ball 15A side. Consequently, a support 10 secured to the rotary shaft 8 is accelerated gradually from the initial state to a maximum speed (at a position where the support 10 is turned by 45 deg.) and then it is decelerated gradually toward the final stage of rotation. With such structure, the support 10 is decelerated easily by a decelerator 9A in the vicinity of rotational angle of 90 deg. thereof while suppressing impact at the time of stopping.</p> |
