Patent ID: 7578373

Claim:
An elevator rope slippage detecting device for detecting presence/absence of slippage between a rope that moves together with movement of a car, 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 rope speed sensor configured to generate a movement speed of the rope based on an observation of the rope; and a processing device including a first speed detecting portion configured to obtain a speed of the car based on the signal from the pulley sensor, a second speed detecting portion configured to obtain a speed of the car based on information on the movement speed from the rope 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.