| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure capable of preventing an output member 102 from abruptly dropping, even if energization to a third motor 108 as an actuator is intercepted, without providing an electromagnetic brake.SOLUTION: Of first motor 104 as an actuator, a second motor 105 as a second actuator, and a third motor 108 as a third actuator, the third motor 108 functioning as an actuator for moving an output member 102 in a vertical direction is made to be a stepping motor having a rotator configured by a permanent magnet. Therefore, even if energization to the third motor is intercepted, the output member 102 can be prevented from abruptly dropping by cogging. |
