Patent ID: 7422210
Filing Date: 2008-09-09
Classification: B65H

Abstract:
1. A printer with a print media sheet deskewing system in a paper path comprising: laterally spaced apart differentially driven drive rollers and a sheet lead edge and trailing edge deskew detection sensor system in said paper path of said differentially driven drive rollers, and said deskew drive system controlled by said sheet lead edge skew detector sensor system positioned downstream of said differentially driven drive rollers to deskew and control the downstream motion of a moving sheet with said differentially driven rollers, further including said sheet trail edge skew detection sensor system comprising at least two transversely spaced optical sensors in said paper path and positioned upstream of said differentially driven drive rollers, said trail edge skew detection sensor system connected to said deskew drive system to make a final additional deskewing correction in the same sheet after a substantial portion but less than all of said sheet is downstream of said differentially driven drive rollers, wherein said sheet trail edge skew detection sensor system makes a final deskewing correction in the same sheet after less than all of said sheet is downstream of said differentially driven drive rollers, wherein said sheet trail edge skew detection sensor system for making a final deskewing correction in the same sheet comprises different trail edge sensors positioned at different distances upstream of said differentially driven drive rollers for trail edge detection of different sheet sizes.