Printhead control system and inkjet printer system

A printhead control system for a printer, wherein the printer includes at least one printhead comprising a plurality of nozzles for ejecting printing fluid, wherein the nozzles include high drop weight nozzles and low drop weight nozzles ejecting drops of different drop weight, and arranged to eject printing fluid on a print medium such as to print images in frame areas of the print medium and such as to clean nozzles in spit bar areas of the print medium;

• the printer further includes a transport unit for moving the print medium relative to the printhead;
• the printhead control device including:
• a module to determine a first group of said nozzles located over a frame area of the print medium and a second group of said nozzles located over a spit bar area of the print medium;
• a module to operate the high drop weight nozzles of the first group such as to eject printing fluid and print an image in the frame area;
• a module to disable the low drop weight nozzles of the first group such as to not eject printing fluid in the frame area;
• and
• a module to operate the high drop weight nozzles and the low drop weight nozzles of the second group such as to alternately eject printing fluid in the spit bar area.

An inkjet printer system comprising:

• at least one printhead including a plurality of nozzles for ejecting printing fluid, wherein the nozzles include high drop weight nozzles and low drop weight nozzles ejecting drops of different drop weight, and arranged to eject printing fluid on a print medium such as to print images in frame areas of the print medium and such as to clean nozzles in spit bar areas of the print medium;
• a transport unit for moving the print medium relative to the printhead;
• and
• a printhead control device including:
• a module to determine a first group of said nozzles located in a frame area of the printing paper and a second group of said nozzles located in a spit bar area of the printing paper;
• a module to operate the high drop weight nozzles of the first group such as to eject printing fluid and print an image in the frame area;
• a module to disable the low drop weight nozzles of the first group such as not to eject printing fluid in the frame area;
• a module to operate the high drop weight nozzles and the low drop weight nozzles of the second group such as to alternately eject printing fluid in the spit bar area, and
• a module to operate the high drop weight nozzles of the first group of nozzles and the alternating nozzles of the second group of nozzles with the same firing frequency.