Patent ID: 6332662
Filing Date: 2001-12-25
Classification: B41J

Abstract:
A printing quality improving method for rotating a line feed motor and printing as much as a width of a printing band, which has a reference line distance set by a line feed value, by being provided with a jetting part having a number of nozzles and jetting ink through the nozzles of said jetting part, said method comprising the steps of:inputting a printing order;detecting the quantity of malfunctioning nozzles among the nozzles of said jetting part in said inputting step and determining the location of said malfunctioning nozzles when malfunctioning nozzles are present;printing firstly as much as a width of a printing band having a reference line distance set by a line feed value in case of the absence of a malfunctioning nozzle in said detecting step;printing secondly a compensation letter line of one line for each of two lines by moving a functioning nozzle to two malfunctioning nozzle positions of each two neighboring lines, after printing with a first printing band, which has a smaller first line distance than said reference line distance, in case of the presence of a single malfunctioning nozzle in said detecting step; andprinting thirdly as much as a width of the printing band having said line distance by positioning a functioning nozzle at a position of detected malfunctioning nozzles for every line having said reference line distance, printing as much as the width of the reference printing band having said reference line distance for every line in case of the presence of two or more malfunctioning nozzles in said detecting step.