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1. (WO2013154575) DUPLEX PRINTING

Pub. No.:    WO/2013/154575    International Application No.:    PCT/US2012/033474
Publication Date: Fri Oct 18 01:59:59 CEST 2013 International Filing Date: Sat Apr 14 01:59:59 CEST 2012
IPC: B41J 3/60
Applicants: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
MACCLARY, Matthew Alan
ROBIN, Daniel Edgar
Inventors: MACCLARY, Matthew Alan
ROBIN, Daniel Edgar
Title: DUPLEX PRINTING
Abstract:
According to one example, there is provided a method of duplex printing. The method comprises printing recto pages and associated recto checkmarks on a first side of a web and printing verso pages and associated verso checkmarks on a second side of a web, the length of each successively printed recto and verso checkmark varying in accordance with a respective recto and verso checkmark length sequence, determining the length of successive printed verso and recto checkmarks and determining their sequence position in the appropriate checkmark length sequence, and determining whether a print error has occurred based on the determined recto and verso checkmark sequence positions.