Patent ID: 7614482

Claim:
An elevator rope slippage detecting device for detecting presence/absence of slippage between a rope that moves together with a car traveling in a hoistway, and a pulley around which the rope is wound and which is rotated through movement of the rope, comprising: a pulley sensor configured to generate a signal in accordance with rotation of the pulley; a car speed sensor configured to directly detect a speed of the car based on a frequency of an oscillating wave received from a reflecting surface on a side wall surface of the hoistway; and a processing device including a first speed detecting portion configured to obtain a speed of the car based on information from the pulley sensor, a second car speed detecting portion configured to obtain a speed of the car based on information from the car speed sensor, and a determination portion configured to determine the presence/absence of slippage between the rope and the pulley by comparing the speed of the car obtained by the first speed detecting portion and the speed of the car obtained by the second speed detecting portion with each other.