Multi-Row Nozzle Timing for High-Speed High-Resolution Liquid Ejection

The patent divides the nozzle system into four separate nozzle rows (first, second, third, and fourth nozzle rows) instead of using two rows. This segmentation allows for independent control and timing of each row, enabling the system to overcome the limitation of overlapping ejection cycles while maintaining precise dot arrangement. Each nozzle row can be controlled independently to eject droplets at optimized intervals.

The patent implements periodic ejection cycles with different start timings for different nozzle rows. By setting different start timings for the first and third nozzle rows, as well as for the second and fourth nozzle rows, the system creates a periodic pattern where ejection cycles overlap in a controlled manner. This periodic action allows for shortened ejection cycles while maintaining proper dot spacing through the alternating arrangement of droplets from different rows.

The patent utilizes the perpendicular direction (conveying direction) as an additional dimension for dot arrangement. By arranging dots from different nozzle rows alternately in the perpendicular direction while maintaining their original arrangement in the first direction, the system achieves high-resolution recording without compromising printing speed. This dimensional approach allows dense dot packing in both directions simultaneously.

The patent dynamically adjusts the ejection timing and dot arrangement based on the selected recording mode (high-speed mode or high-resolution mode). In high-speed mode, the system uses a first dot row arrangement with increased perpendicular spacing. In high-resolution mode, the system alternately arranges dots from multiple nozzle rows in both the first direction and perpendicular direction, dynamically optimizing the dot pattern to achieve finer resolution without sacrificing overall printing throughput.