Printhead module for expelling ink from nozzles in groups, alternately, starting at outside nozzles of each group

摘要

A printhead module including at least one row that comprises a plurality of sets of n adjacent nozzles, each of the nozzles being configured to expel ink in response to a fire signal, such that, for each set of nozzles, a fire signal is provided in accordance with the sequence: [nozzle position 1, nozzle position n, nozzle position 2, nozzle position (n-1), . . . , nozzle position x], wherein nozzle position x is at or adjacent the centre of the set of nozzles.