Patent ID: 7500669
Filing Date: 2009-03-10
Classification: B65H,G03G

Abstract:
1. A printing system, comprising: a media registration transport for transporting a media sheet along a path; a sensing system including a plurality of sensors positioned substantially in line and orthogonal to the feed direction of said sheet path for detecting a leading edge of the media sheet; a control system for detecting signals at the times when each of said plurality of sensors are occluded; said control system including a control algorithm comparing each one of said sensor signals with every other of said sensor signals forming a series of paired comparisons; said control algorithm identifies at least one paired comparison of sensor signals having inconsistent readings with the other paired comparisons of sensor signals; said control algorithm determines presence of a tab on said leading edge based on said inconsistent at least one paired comparison of sensor signal readings; said control algorithm removes said at least one paired comparison of inconsistent sensor signals to determine a skew of said leading edge based on said other paired comparisons; and, said media registration transport performs a deskew operation on said media sheet based on said skew of said leading edge.