Patent ID: 6280023
Filing Date: 2001-08-28
Classification: B41J

Abstract:
A continuous ink-jet printing method comprisingproviding a stream of droplets from a nozzle of a continuous ink-jet printhead;moving a print substrate past the printhead, said printhead having a pair of deflection electrodes for deflecting individual charged droplets from said stream of droplets to a required print position on the substrate;disposing said deflection electrodes at a preselected angle relative to the path of movement of said print substrate;determining, in accordance with said deflection electrode angle, for each of a series of droplets to be printed on said substrate to form an image, the value of the charge to be applied to the droplet by looking-up the value from a memory containing values representative of the vector position of each droplet of each printable character and said values are charge values for each droplet;determining the speed of movement of the print substrate relative to the printhead;correcting the values of the charges to be applied to the droplets in said stream and adjusting the number of uncharged droplets between printable droplets in accordance with the determined speed of the substrate, the correction of the values of the charges to be applied to each of the droplets in the stream is carried out by predetermining corrected values due to aerodynamic effects for each character to be printed and storing them in a memory and the correction is carried out by correcting the values after they are read from the memory and; andapplying the respective charges to each of the droplets in turn.