| 摘要 |
PURPOSE:To hold a cage in a predetermined stop position by energizing an electromagnetic selector valve with a floor-mating speed signal to open a hydraulic pipe line and performing a feedback of a speed or a position of the cage, when it is sunk from a regulated position during stopping of the cage. CONSTITUTION:In a speed control device 25, when a cage 5, during its stopping by closing a normally-open contact 30d, is detected for sinking from a regulated position, a floor-mating speed signal is output from a floor-mating pattern generating circuit, while a hydraulic circuit 11a to a jack 3 is opened by selecting an electromagnetic selector valve 11. While a feedback of a cage speed signal 8a from a cage speed detecting device 8 or a cage position is performed, a speed of an electric motor 13, that is, speed of an oil hydraulic pump 12 is controlled through an inverter 23 to perform floor-mating corresponding to the displacement of the cage 5. In this way, delay of action and generation of a shock at the time of starting can be prevented while being possible to hold the cage in a predetermined stop position. |
