Detector for regions of excess thickness in a moving web and web

Advancing material of indeterminate length – With material-responsive control means – Detector means

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Details

200 6113, 200 6115, 226100, B65H 2600, H01H 900

Patent

active

057622523

ABSTRACT:
A detector (14) for regions of excess thickness in a moving web (12a) includes a first jaw member (120; 72, 82); a second jaw member (122; 68, 70); a frame (56; 120a, 122a) supporting the first and second jaw members with a gap (88; 138) there between through which a web can be transported, the gap having a width more narrow than a maximum desired thickness of a transported web; a support (52, 54; 116, 118; 160, 162; 164, 166) for the frame to allow the frame and the first and second jaw members to move when a web having a region of thickness in excess of the width of the gap engages the jaw members at the gap; and a sensor (96-100; 148-152) for detecting movement of the frame to indicate presence of a region of excess thickness at the gap. A web transport system embodying such a detector also is disclosed.

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