Patent ID: 8056897
Filing Date: 2011-11-15
Classification: B65H

Abstract:
1. A method of moving a sheet to a desired Y position during movement of the sheet through a registration system having an X direction in which the sheet is moving and a Y direction perpendicular to the X direction, comprising; moving the sheet along a path in the X direction, moving a side edge sensor in the Y direction from a known Y position during passage of the sheet through the registration system until the top side edge is detected, noting the Y position of the sensor when said side edge is detected, detecting the leading edge of said sheet by a plurality of leading edge sensors positioned on the same Y axis, sending a signal to a controller indicative of the Y position of the sensor when the top side edge is detected, sending a signal to the controller indicative of the time when the leading edge passes each of the leading edge sensors, using the signals sent to the controller from the leading edge sensors and side edge sensor to determine the skew of said sheet and the Y coordinate of the corner of the top side edge and leading edge of said sheet, and using the Y coordinate of the corner of the to side edge and leading edge to provide information to said registration system for moving the sheet to the desired Y position.