| 摘要 |
The detector is designed to sense one or more broken rollers on an escalator, and then to automatically shut down the escalator to prevent damage or injury. Dual proximity sensors are positionable proximate a roller path so as to sense the outside diameter of each roller as the roller passes close to the sensors when the escalator is in motion. As long as each roller is intact, the sensors will transmit a symmetrical time pulse signal. A broken roller will fall away from its spool and no longer trigger the sensors, and the resulting interruption will interrupt the symmetry and turn off the escalator.
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