Method and apparatus with vernier technique for registration of ejector module

A machine-readable storage medium having executable software code for aligning an ejector module in a printhead array along a lateral direction, the ejector module having nozzles that eject fluid on command, the software code comprising:

• instructions for arranging a first plurality of nozzles within a first module, the first plurality of nozzles including a first spacing between adjacent first nozzles along the lateral direction;
• instructions for arranging a second plurality of nozzles at one end of a second module, the second plurality of nozzles including a second spacing between adjacent second nozzles that differs from the first spacing along the lateral direction, the second plurality of nozzles partially overlapping the first plurality of nozzles in the lateral direction at the one end;
• instructions for determining an alignment pair between a first alignment nozzle of the first plurality of nozzles and a second alignment nozzle of the second plurality of nozzles, the first and second alignment nozzles minimizing an alignment spacing between each other as compared to remaining nozzles of the first and second pluralities of nozzles;
• and
• instructions for assigning the first and second alignment nozzles as first and second boundaries for print actuation.

An apparatus for aligning an ejector module in a printhead array along a lateral direction, the ejector module having nozzles that eject fluid on command, the apparatus comprising:

• a first plurality of nozzles within a first module, the first plurality of nozzles including a first spacing between adjacent first nozzles along the lateral direction;
• a second plurality of nozzles at one end of a second module, the second plurality of nozzles including a second spacing between adjacent second nozzles that differs from the first spacing along the lateral direction, the second plurality of nozzles partially overlapping the first plurality of nozzles in the lateral direction at the one end;
• an alignment determiner that determines an alignment pair between a first alignment nozzle of the first plurality of nozzles and a second alignment nozzle of the second plurality of nozzles, the first and second alignment nozzles arranged to minimize an alignment spacing between each other as compared to remaining nozzles of the first and second pluralities of nozzles;
• and
• a print actuator that establishes first and second boundaries for print actuation assigned by the first and second alignment nozzles.