Device for monitoring a web
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United States of America Patent
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Nov 19, 2013
Grant Date -
Aug 26, 2010
app pub date -
Feb 1, 2007
filing date -
Feb 1, 2006
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention relates to a device for monitoring a web. The device includes cameras imaging the web in order to take digital images of the web from a transverse area of the web at the imaging frequency. Each camera includes an image element, which consists of pixels. The individual pixels of the imaging element of the camera are real image-elements. The real image-elements are arranged to combine to form effective image-elements of the web in the machine direction. In addition, the cameras used in the device are matrix cameras, the imaging elements in which are arranged to be exposed simultaneously. The real image-elements are arranged to be combined to form effective image-elements by exploiting the binning function of the matrix camera. The device includes a strobe-lighting unit, the synchronization of which is arranged in step with the exposure of the matrix cameras, the imaging periods being common to all the cameras. The imaging frequency is arranged to be such that essentially all the areas of the web are imaged.
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