Patent ID: 6988725
Filing Date: 2006-01-24
Classification: B41J,B65H

Abstract:
1. A method of registering a sheet of a copy medium in a duplex reproduction machine to alleviate the misalignment between the respective images copied on the front and back of said particular sheet, said method comprising: measuring the error angle of skew between a registration target angle and the trailing edge of said sheet during a first pass before a first image is reproduced on said front of said sheet; and adjusting said registration target angle for said sheet during a second pass to compensated for said error angle of skew wherein any misalignment between said first image and a second image to be reproduced on the back of said sheet is alleviated; wherein said registration target angle is equal to 90°; wherein said registration target angle for said second pass is adjusted to a valve equal to (90° said error angle of skew); wherein said error of skew is measured by a pair of sensors located near the top and the bottom of said sheet which sense said trailing edge of said sheet as said sheet passes over said sensors; wherein said error angle of skew is stored during said first pass and is then retrieved during said second pass.