US 11,813,861 B2
Method for single-pass monochrome printing at high speeds
Julie Catherine Hogan, Dublin (IE); Ronan Palliser, Dublin (IE); John Sheahan, North Ryde (AU); Brian Brown, North Ryde (AU); Caitriona Forbes, Dublin (IE); and Pat Lehane, Dublin (IE)
Assigned to Memjet Technology Limited, Dublin (IE)
Filed by Memjet Technology Limited, Dublin (IE)
Filed on Sep. 7, 2021, as Appl. No. 17/467,872.
Claims priority of provisional application 63/076,043, filed on Sep. 9, 2020.
Prior Publication US 2022/0072854 A1, Mar. 10, 2022
Int. Cl. B41J 2/045 (2006.01)
CPC B41J 2/04573 (2013.01) [B41J 2/04505 (2013.01); B41J 2/04541 (2013.01); B41J 2/04586 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of printing an image from a printhead module having a plurality of horizontal nozzle rows, each nozzle row having a main row portion and a corresponding dropped row portion vertically offset from the main row portion, the method comprising the steps of:
identifying a print speed;
identifying a print resolution;
determining a predetermined delay for the dropped row portions based on the offset, the print speed and the print resolution;
storing the predetermined delay in a register of the printhead module;
allocating dot data for image lines to respective nozzle rows based on the print speed and print resolution, wherein each main row portion and its corresponding dropped row portion are allocated dot data for a same image line;
sending the dot data to the printhead module, the dot data including first dot data for each main row portion and second dot data for each dropped row portion;
firing nozzles from the main row portions in a predetermined sequence based on the print speed and print resolution; and
firing nozzles from the dropped row portions in said predetermined sequence,
wherein each dropped row portion is fired independently of its corresponding main row portion and delayed relative to its corresponding main row portion by the predetermined delay stored in the register, such that the predetermined delay aligns droplets fired from each dropped row portion with droplets fired from its corresponding main row portion,
wherein;
the first dot data is transferred to first data latches corresponding to the main row portion;
the second dot data is buffered in a dedicated buffer of the printhead module;
the buffered second dot data is transferred to second data latches corresponding to the dropped row portion based on the predetermined delay.