Ink discharge amount adjuster for each color of line inkjet printer

摘要

Displacement information indicating a displacement amount of landing position in a main scanning direction of ink droplets discharged respectively from the nozzle of the head module of the same array of the line head of each color is acquired for each head module of the same array (steps S5, S7). Based on the displacement information and concentration information for each array, a color degree of an image when the discharge amount of ink droplets discharged from a nozzle of a head module of each color is not adjusted is specified for each head module of each array (step S9). A correction voltage value of a drive signal for the discharge of the nozzle of the head module of each color, which is suitable to return the specified color degree to “0”, is calculated (step S11) and each corresponding nozzle is driven by the drive signal of the correction voltage value.

主权项

1. An ink discharge amount adjuster for each color of a line inkjet printer, comprising:
a plurality of line heads which includes head modules arranged side by side in a plurality of arrays in a print scanning direction intersecting a transfer direction of a print sheet and which is configured to discharge ink droplets of a color different for each line head from a number of nozzles provided in each head module of each line head; a displacement information setter in which displacement information indicating a displacement amount of a head module in the print scanning direction resulting in displacement of dots of each color formed on the same pixel of the print sheet respectively by ink droplets of each color discharged from a nozzle of the head module of each line head is set for each of the head modules of each line head arranged in the same array in the transfer direction; a correction contents determiner configured to determine, for each color, correction contents of a drive condition for adjusting a discharge amount per ink droplet discharged respectively from the nozzle of the head module of each line head arranged in the same array in order to reduce a color difference between each array of dots formed respectively on each pixel of the print sheet based on the displacement information set in the displacement information setter, the drive condition for adjusting a discharge amount per ink droplet is the same within each head module; and a discharge amount corrector configured to correct the discharge amount of ink droplets from the nozzle of the head module of each line head arranged in the same array based on the correction contents determined for each color by the correction contents determiner.