| 摘要 |
A pair of sheaves, i.e. a return wheel and a drive sheave, are provided at the upper and lower parts of an elevator shaft. A body capable of elevating/lowering in the elevator shaft is connected with one and the other end parts of a main rope wound on each sheave. The elevating/lowering body is provided with a rope tension adjuster for adjusting the tension of the main rope. The rope tension adjuster comprises a tension detector for detecting the tension of the main rope, and an actuator for displacing any one of the one end part or the other end part of the main rope from the elevating/lowering body according to information from the tension detector. ® KIPO & WIPO 2007
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