Chain wear monitoring method and apparatus
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United States of America Patent
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Feb 8, 2005
Grant Date -
Nov 18, 2004
app pub date -
Apr 2, 2004
filing date -
Apr 5, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for automatically monitoring the wear of a chain when in operation in a chain drive assembly. First and second markers are applied to the chain at a predetermined distance apart. A first sensor is disposed adjacent to the chain to coincide with the position of the first marker. A second sensor is disposed adjacent to the chain to coincide with the position of the second marker. The sensors generate signals in response to the detection of the markers. When the chain drive is operated the first and second sensors are initially triggered substantially simultaneously by said first and second markers respectively. After the chain extends through wear elongation is identified by detecting a time delay between the triggering of the first and second sensors by the respective markers. One of the sensors is then moved to a position where substantially simultaneous triggering of the sensors by the markers can be resumed. The distance the sensor has to be moved is measured to determine the elongation length of the chain.
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