Method and apparatus for sensing sheet-like elements
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United States of America Patent
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Aug 11, 1987
Grant Date -
N/A
app pub date -
Apr 2, 1985
filing date -
Apr 2, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for use with a label strip or the like which includes an elongated web and a plurality of labels with the labels being on the web and being separated by a gap. The label strip is moved through a label sensing station, and light is directed toward the label strip at the label sensing station so that the light impinges sequentially on the labels and the web in the gaps. The light is directed against the label strip at an acute angle of incidence which is sufficiently small so that an optical signal is reflected from the web in the gap at the sensing station. The optical signal is detected to indicate the presence of the gap at the sensing station. A barrier cooperates with the labels to block light other than the optical signal from being conducted from the light source to the detector.
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