Patent ID: 8075086

Claim:
A method for aligning print heads of a printer that deposit inks onto web paper, comprising: A. calibrating alignment of said print heads by; a) printing a registration test pattern; b) determining lateral alignment between said print heads from said test pattern; c) actuating motors connected to said print heads to move said print heads into alignment based upon said lateral alignment determination; d) measuring initial skew of said web paper derived from c); and e) resetting a cumulative motors move log; and then B. monitoring lateral alignment of said print heads by; a) printing a registration test pattern; b) determining lateral alignment between said print heads from said test pattern; c) actuating motors connected to said print heads to move said print heads into alignment based upon said lateral alignment determination; d) updating said cumulative motor move log by adding motor movement in c); e) extracting relative skew from said cumulative motor move log; and f) adding said relative skew to said initial skew to obtain absolute skew.