Apparatus for measuring variations in windings of coiled material
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Sep 6, 1991
filing date -
Sep 6, 1991
priority date (Note) -
Expired
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Abstract
Apparatus for measuring lap to lap variations between windings of a coiled sheet product comprising a light source, a light measuring cell, and a light directing chamber located between the light source and the light measuring cell. The light directing chamber includes a cavity adapted to receive a shutter, and a light directing duct having a slot communicating with the cavity of the light directing chamber. The slot is adapted to provide an opening for inserting the shutter into the interior portion of the light directing duct.
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