Patent ID: 9327942
Filing Date: 2016-05-03
CPC Classification: B66B

Claim Text:
1. An elevator rope sway detection device that detects sways of ropes installed in a hoistway of an elevator, comprising: a sway detector that has two or more different levels for detecting predetermined sway displacements of the elevator ropes; a detection signal memorization unit that memorizes detection signal information from the sway detector; a detection signal calculation unit that performs a predetermined calculation using the detection signal information memorized in the detection signal memorization unit; a rope sway determination unit that determines, on the basis of a result calculated by the detection signal calculation unit, whether or not the detection signal information is produced by a rope sway; and an elevator controller that controls, on the basis of a result determined by the rope sway determination unit, the elevator so that the elevator performs a predetermined operation, wherein the sway detector has two or more different detection lines configured by using beam emitting components for emitting beams and beam receiving components for receiving the emitted beams, that are installed on a fixed structure of the hoistway, wherein the detection lines have two different detection levels for detecting rope sways in right and left directions in which rope installation intervals are large, wherein two first detection lines are provided a same distance apart from a rightmost rope and a leftmost rope, and one or more second detection lines are provided for either the rightmost rope or the leftmost rope, and wherein the detection lines are provided at positions shifted in a width direction and a height direction by predetermined distances which are determined by a beam spread characteristic of the beam emitting components.