Conveyors: power-driven – Conveyor section – Endless conveyor
Reexamination Certificate
2007-10-02
2007-10-02
Bidwell, James R. (Department: 3651)
Conveyors: power-driven
Conveyor section
Endless conveyor
C198S502100
Reexamination Certificate
active
11361040
ABSTRACT:
A method of monitoring the condition of magnetically permeable reinforcing cords of a conveyor belt is disclosed. The cords are longitudinally magnetized with a substantially unidirectional magnetic field. The conveyor belt is then moved relative to a plurality of magnetic sensors spaced apart and extending transversely relative to the conveyor belt. Then the sensors are interrogated at spaced apart intervals of time and used to detect the presence of a north polarity fringing magnetic field, a south polarity fringing magnetic field, or no fringing magnetic field, the output of each of the senses being recorded. Alternatively, a wave form of the voltage or current induced in the sensors can be derived therefrom and the waveform used to represent a north polarity fringing magnetic field, a south polarity fringing magnetic filed, or no fringing magnetic field, the waveform being recorded. A method of generating a computer display to represent the condition of the magnetically permeable reinforcing chords is also disclosed.
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patent: 4437563 (1984-03-01), Oriol
patent: 4621727 (1986-11-01), Strader
patent: 4854446 (1989-08-01), Strader
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