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:
Oct. 28, 1986
Filed:
Feb. 19, 1985
Ulf Nedstedt, Eslov, SE;
Tetra Pak International AB, Lund, SE;
Abstract
Sensing arrangements on material rolls are used to give advance warning when the material web forming the roll approaches its end. Usually this involves the sensing of the reduction of the the roll diameter with the help of a sensing device resting against the roll periphery. In the case of roll suspensions where the center of the roll is not fixed, these sensing arrangements cannot be used. The present invention uses a sensing arrangement which comprises a field-generating element, e.g. a permanent magnet, present in the center of the roll, together with a movable sensing device resting against the periphery of the roll, e.g. a heavy current switch which is acted upon at a certain predetermined field strength, and in a suitable manner indicates that a roll replacement is imminent.