| 摘要 |
PROBLEM TO BE SOLVED: To smoothly move movable bodies by reducing variation of load applied to drive means.SOLUTION: Each of a first auxiliary mechanism 103A and a second auxiliary mechanism 103B includes a first hook part 183 connected to a movable body 101, and a tension coil spring 180 to which a second hook 184 is fixed, at an installation member 50. A coil part 182 is elastically stretchingly deformed, so that the tension coil spring 180 energizes the movable body 101 to a second position located at the upper side of a first position. Further, a direction-changing part is provided at a position away from a straight line that connects the first hook part 183 to the second hook part 184 of the tension coil spring, and the tension coil spring 180 is bently disposed, with it hooked to the direction-changing part 181. The direction-changing part comprises an outer surface of a rotating body 188 rotatably disposed on the installation member 50. |
