Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-05-13
1978-08-08
Trafton, David L.
Communications: electrical
Condition responsive indicating system
Specific condition
198856, 324208, G08B 2100, B65G 4300
Patent
active
041060059
ABSTRACT:
An apparatus for detecting elongation of the joint of a conveyor belt has a pair of sensors, each of which includes an iron core having a coil winding therearound and being spaced at a predetermined distance from each other parallel with the conveyor belt and which distance is greater than the length of the joint along the belt. A pair of magnetic elements is fixed to the underside surface of the belt, the magnetic elements being spaced from each other a distance equal to the distance between the sensors when the joint is unelongated, so that said sensors and elements are aligned during movement of the conveyor belt past the sensors. A waveform shaping circuit is coupled to each of the sensors, a pulse generator is coupled to the sensor which is ahead of the other sensor in the direction of movement of the conveyor belt for generating a pulse in response to the output of the sensor having a duration corresponding to the maximum permissible elongation of the joint of the conveyor belt, and logic circuit means is coupled to the outputs of the pulse generator and the waveform shaping circuit coupled to the other sensor for producing an output when a delay which is longer than the delay corresponding to the maximum permissible elongation of the joint occurs between the output of the waveform shaping circuits. An alarm or a belt drive shut-down device is coupled to the logic circuit means and is actuated by the output of the logic circuit means for responding to an elongation of the joint which is greater than the maximum permissible elongation.
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Nippon Konbeya Kabushiki Kaisha
Trafton David L.
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