Patent ID: 6644652
Filing Date: 2003-11-11
Classification: B65H,G03G

Abstract:
In a printing apparatus having a marking station operatively disposed along a path, an inverter downstream of the marking station along the path, a duplex loop connecting the inverter to a location upstream of the marking station along the path, and a duplex sensor disposed at a predetermined location along the duplex loop for detecting a lead edge of a sheet, a method for controlling motion of a sheet in the apparatus, comprising:causing the sheet to move through the path at a process velocity; causing the sheet to move through a portion of the duplex loop at a duplex velocity; determining an error of the sheet arriving at the duplex sensor relative to a predetermined arrival time; and calculating, based on at least the error, a time for initiating a change in velocity of the sheet from the duplex velocity to the process velocity, the calculating step including determining if the error is outside a range, and if the error is outside the range, using a substitute error value instead of the determined error.