Method and apparatus for monitoring the run of a belt
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United States of America Patent
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-
Mar 17, 1992
Grant Date -
N/A
app pub date -
Oct 5, 1990
filing date -
Oct 5, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The run of a belt, such as a conveyor belt or a belt of a weighing scale, is monitored for keeping the belt in a substantially centered position. For this purpose, the belt has a marking element, and a stationary sensor is so arranged that it can scan at least two edges of the marking element. One marking edge extends perpendicularly to the belt running direction. The other marking edge extends at a slant or angle to the belt running direction. Thus, the sensor produces two marker signals at least one of which changes when the belt makes an off-center excursion. The two marker signals and a belt speed representing signal are processed in a computer to provide a belt deviation signal which may be used to correct the belt direction eitehr normally or automatically. The marking element has a triangular configuration and is so arranged that one side of the triangle extends substantially perpendicularly to the belt running direction.
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