Method for adjusting drive roller linefeed distance
Method for adjusting drive roller linefeed distance
United States Patent RE40,775
Arquilevich , et al.
June 23, 2009
Inventors: Arquilevich; Dan (Portland, OR), Rasmussen; Steve O. (Vancouver, WA), Stephens; Vance M. (Brush Prairie, WA)
Assignee: Hewlett-Packard Development Company, L.P. (Houston, TX)
Appl. No.: 10/279,709
Filed: October 23, 2002
Abstract
A difference in feed roller diameter from one printer to another causes a media to advance by a different amount for a given rotation of a drive shaft to which the feed roller is coupled. Such variation in advance distance is a linefeed error. Mean linefeed error is determined and corrected by printing a test plot having several areas. Each area is formed of the same image pattern, but is printed at a different linefeed error adjustment to compensate for mean linefeed error. The different adjustments are prescribed and span a typical compensation range for a given print engine model. The different adjustment factors cause banding to occur in some areas. The user picks one of the test pattern areas which has the highest print quality (i.e., least or no banding). The linefeed adjustment factor corresponding to such area is used for normal printing.
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