Method and an apparatus for detecting indices of paper based on a replaceable intermediate or average threshold value
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United States of America Patent
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Mar 8, 1994
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N/A
app pub date -
Aug 10, 1992
filing date -
Aug 13, 1991
priority date (Note) -
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Abstract
In detecting indices (references) provided on a base paper with a distance therebetween along the longitudinal direction of the base paper, wherein either passed or reflected light amount through or from the indices differs, by a light detector positioned on a feed path while the indices are fed along the longitudinal direction, a threshold value is renewed each time when at least three indices are detected based upon peak values (maximum and minimum values) of output signals from the light detector. This is accomplished by renewing the threshold value by calculating the new threshold value based upon an intermediate or average value among the peak values between, for example, the indices in order to continue the indices position detecting process in an accurate fashion even if there is an abnormality in the base paper or others when the abnormality is minor such that it does not interfere with the subsequent process.
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