Patent ID: 8706017

Claim:
A method of maintaining side 1 to side 2 registration during duplex imaging on paper in an ink jet printing system, comprising: printing a side 1 start up duplex registration pattern in ink on side 1 of said paper; printing a side 2 start up duplex registration pattern in ink on side 2 of said paper; providing a single full width image on web array sensor; capturing a side 2 image and a side 1 show through image with said full width image on web array sensor; determining difference between measured and desired spacing in process and cross process directions in response to signals from said full width image on web array sensor; adjusting head delays and positions to achieve desired registration; beginning a print job; printing side 1 inter-document zone duplex registration pattern on side 1 ; printing side 2 inter-document zone duplex registration pattern on side 2 ; capturing side 2 inter-document zone duplex registration image and side 1 show through image; determining difference between measured and desired spacing in process and cross process directions in response to signals from said full width image on web array sensor; adjusting head delays and positions to maintain desired registration, and repeating said registration pattern and determining the difference between measured and desired spacing in process and cross process directions and making appropriate head delays and position adjustments during said print job to maintain desired registration.