The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 1993
Filed:
Jul. 17, 1991
Hobart A Whitman, III, Asheville, NC (US);
P. H. Glatfelter Company, Spring Grove, PA (US);
Abstract
The detection of abrupt changes in opacity of a moving sheet resulting from, for example, an overlap type splice is provided. The web material is fed between two identical light emitter/detector pairs such that its opacity is measured. An abrupt change in web thickness passing through one light emitter/detector pair is sensed as a change in web opacity. The difference and resulting imbalance with the opacity signal from the other light emitter/detector pair, not yet interrupted with the abrupt change, is utilized to indicate the presence of the defect which, in this application, could be an overlap splice. The disclosed invention, although adaptable to thicker textile webs, specifically relates to a device for the detection of overlap splices in a moving sheet representative of all the paper types required by the cigarette, printing, and labeling industries.