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US07645979B2 Optical detection for low optical density web 有权
低光密度网的光学检测

Optical detection for low optical density web
Abstract:
Apparatus for buffering of a web feed system using feedback based on the amount, or extent, of loop of the web within a buffering module. The extent of the loop is measured optically. An opaque extensor is inserted within the loop to mark the extent of the loop so as to enable the optical sensor to work accurately even if the web is transparent.
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