| 摘要 |
PURPOSE: To eliminate the possibility that a second arm is turned over a movable range even in the case of power failure and to reduce the weight of an articulated device by providing a detecting means for detecting the attitude of an oscillating lever taking a different attitude depending on the rotating direction of a dog fitted to a transmission shaft. CONSTITUTION: When a transmission shaft 5 is turned to the left at 90 deg.+αfrom the reference position by rotation of a motor, a dog 13 is brought into collision contact with an oscillating lever 21 from below, and tilted from CC direction in the neutral state to LL direction, and the oscillating lever 21 is brought into contact with a limit switch 23 to indicate that the transmission shaft 5 is turned to the left to reach the current position. When the transmission shaft 5 is returned to the original position from such a condition, even in the case of power failure, the oscillating lever 21 is restored by a spring 11 to be returned to the neutral state CC. Similarly, when the transmission is turned to the right from the reference position, the oscillating lever 2 is brought into collision contact with the dog 13 to be tilted toward RR direction. At this time, the lever 21 is brought into contact with a limit switch 22 to indicate that the transmission shaft 5 is turned to the right to reach the original position. Also in this case, the lever 21 is returned to the neutral position by return of the transmission shaft 5 to the original position.
|
