| 摘要 |
PROBLEM TO BE SOLVED: To improve a device for outputting a position signal of a car to a device for forcibly decelerating the car at upper and lower ends of a hoistway.SOLUTION: A car 2 of an elevator is provided with a photoelectric sensor 3, and a plurality of shield plates 11-14 are installed at a predetermined position of a hoistway 1 facing the photoelectric sensor 3. One gap G is provided on the shield plates 11, 13 close to a center of the hoistway 1 among the respective shield plates, and two gaps G are vertically provided at the shield plates 12, 14 close to an end of the hoistway 1. Then, at what position of the shield plates the car 2 exists is detected by detecting boundaries and upper and lower ends (edges) between the shield plates and the gaps G and counting them by the photoelectric sensor 3 by hoisting of the car 2.SELECTED DRAWING: Figure 1 |
