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:
Aug. 13, 2002
Filed:
Nov. 29, 2000
Kevin Lauren Cote, Durham, NH (US);
Lothar John Schroeder, Portsmouth, NH (US);
Heidelberger Druckmaschinen AG, Heidelberg, DE;
Abstract
An apparatus for calibrating a tension transducer for a web includes a pair of nip rollers and a motor for driving at least one of the pair of nip rollers, the motor having at least one roller output being a function of at least one of a motor torque and a motor velocity. A web tension transducer roll is located upstream of the nip rollers, the web tension transducer having a tension output being a function of the actual web tension of the web. A processor receives the at least one roller output and the tension output, the processor calculating a tension correction value as a function of the at least one roller output and the tension output. Also provided is a method for calibrating a tension transducer for a web comprising the steps of running the web over a tension transducer and through nip rollers, the nip rollers being run by a motor, varying a characteristic of the motor and reading actual reference signals from the transducer as the characteristic is varied, and calculating at least one correction value as a function of the actual reference signals.