| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect contact and crossing of elevator ropes. <P>SOLUTION: The elevator includes a car, a counterweight, a plurality of ropes 40, a sheave, and a rope crossing monitoring system 70. The plurality of ropes 40 are wound around the sheave in a state that they are arranged in parallel spaced from each other and connect the car to the counterweight. The rope crossing monitoring system 70 includes a conduction part 72, a power supply 74, a current value detection part 76, a current change detection part 78, and a control part 80. The conduction part 72 electrically connects the plurality of ropes 40 in series and composes a circuit together with the plurality of ropes. The power supply 74 supplies a current to the circuit. The current value detection part 76 detects a value of the current that flows in the circuit. The current change detection part 78 detects a change in the current value detected by the current value detection part. The control part 80 controls the operation of the car based on the change in the current value detected by the current change detection part 78. <P>COPYRIGHT: (C)2012,JPO&INPIT |
