Patent ID: 9002256
Filing Date: 2015-04-07
Classification: B65H,G03G

Abstract:
1. A method of correcting for paper process direction arrival errors during a print job in a print engine, comprising: determining paper sheet arrival times at a first registration point in the print engine over a predetermined time period; calculating a running average of the determined arrival times for most recent N sheets, where N is an integer, wherein the calculation of the running average is performed continuously for the duration of the print job; comparing the average arrival time to an expected sheet arrival time for the first registration point; determining a registration correction factor as a function of a difference between the average arrival time to an expected sheet arrival time for the first registration point; adding the correction factor to an expected arrival time for a second registration point to generate an updated expected arrival time value for the second registration point; and adjusting control parameters of a marking module in the print engine according to the updated expected arrival time value.