IMPROVEMENTS RELATING TO SAFETY MECHANISMS FOR INDUSTRIAL MACHINERY

摘要

A number of pairs of transmitter and receiver for detecting an opaque object in the detecting space is aligned with constant interval on the poles positioned on the opposite side of each other. at least one pair of transmitter and receiver is operated to detect the opaque object and rest of pairs a test their functions by themselves. When the received signal is greater than preset level, the device generates the signal of stray source to stop the machine.