Method of expelling ink from nozzels in groups, starting at outside nozzels of each group

摘要

A method of expelling ink from a printhead module is provided. The printhead module includes at least one row that has a plurality of sets of n adjacent nozzles. Each of the nozzles is configured to expel ink in response to a fire signal. The method includes providing a fire signal to nozzles at a first and nth position in each set of nozzles, and providing a fire signal to the next inward pair of nozzles in each set. In the event n is an even number, a fire signal is provided to each next inward pair until all of the nozzles in each set has been fired. In the event n is an odd number, a fire signal is provided to each next inward pair until all of the nozzles but a central nozzle in each set have been fired, and then firing the central nozzle.