Patent ID: 7837284
Filing Date: 2010-11-23
Classification: B41J

Abstract:
1. A printhead assembly comprising: a plurality of elongate printhead modules arranged to aggregately extend across a pagewidth, each printhead module having plural rows of ink ejection nozzles, the nozzle rows of at least one of the printhead modules being longer than the nozzle rows of the other printhead modules; a plurality of controllers for processing print data into dot data and for controlling ink ejection of the nozzles of the printhead modules in accordance with the dot data, at least one of the controllers being arranged to control all of the printhead modules and at least one other of the controllers being arranged to control only one of the printhead modules; and shift registers for shifting in the dot data from the controllers to the nozzle rows of the printhead modules, each shift register being configured to shift dot data into a group of nozzles of each nozzle row, each group of nozzles being interleaved with at least one of the other groups of nozzles, wherein said at least one controller has at least two serial outputs for supplying the dot data to the printhead modules, wherein said at least one other of the controllers is arranged to receive at least some of the dot data generated by the at least one controller, said at least one other of the controllers being configured to control the respective printhead module based on the dot data generated thereby and the received dot data.