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. 30, 2014
Filed:
Dec. 07, 2009
Daniel J. Theis, Mahtomedi, MN (US);
Daniel H. Carlson, Arden Hills, MN (US);
Brian K. Nelson, Shoreview, MN (US);
Daniel J. Theis, Mahtomedi, MN (US);
Daniel H. Carlson, Arden Hills, MN (US);
Brian K. Nelson, Shoreview, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Approaches for enhancing web position determination involve phase locking a web movement encoder signal to a sensed web fiducial signal. Fiducials disposed along a longitudinal axis of a substrate are sensed and corresponding sensor signals are generated. An estimated web position is provided by one or more encoder signals. The phase difference between the sensor signals and the encoder signals is calculated and the web position error is determined based on the phase difference. The web position error signal can be fed back to adjust the encoder signals which improves the accuracy of the web position determination.