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:
Jun. 13, 1978
Filed:
Mar. 08, 1976
Agfa-Gevaert Aktiengesellschaft, Leverkusen, DT;
Abstract
The device for detecting local thickening in webs of paper or film is based on the fact that the thickenings are first mechanically sensed and the mechanical sensing is converted by simple means into an electrical signal. The arrangement consists basically of a stationary roller over which the web to be examined is guided and a pivotal sensor roller mounted at a narrow interval from the guide roller. The sensor roller is mounted on two separate pivotal levers and rotates at the same speed as, but in the opposite direction to, the guide roller. The pivotal levers are provided with stops which determine a gap between the guide roller and the sensor roller through which the web is guided. The stops are in the form of contact switches through which the same electrical current successively flows, so that the flow of current is temporarily interrupted when one or both stops is lifted off its support when a thickening passes through the gap.