Patent ID: 6196662
Filing Date: 2001-03-06
Classification: B41J

Abstract:
A method for operating a printing apparatus having a stationary print head with a plurality of linearly aligned printing elements having a fixed printing element-to-adjacent printing-element spacing D and oriented at a predetermined angle A to a process direction along which a document to be printed is fed, whereby said spacing D and said angle A define a scan line spacing B between adjacent elements orthogonal to the process direction, said scan line spacing B being less than said spacing D, and a process spacing C between adjacent elements in the process direction, the printing elements operable to discharge printing media at a predetermined printing frequency N, the method comprising a series of arithmetic and logic operations including:dividing said process spacing C by said scan line spacing B to determine an integer with remainder wherein the remainder defines a discharge placement error as a fraction of the scan line spacing B;determining a discharge correction from said placement error and the printing frequency N;discharging printing media from said first printing element on the document; anddischarging printing media on said document from said second printing element, said discharge of printing media from said second printing element delayed in time from said discharge of printing media from said first printing element, commensurate with said discharge correction.