US Patent 7178901 Printhead assembly with dual power supply

A printhead assembly is provided comprising at least one printhead module comprising at least two printhead integrated circuits, each of which has nozzles formed therein for delivering printing fluid onto the surface of print media, a support member supporting and carrying the printing fluid for the at least two printhead integrated circuits, and an electrical connector for connecting electrical signals to the at least two printhead integrated circuits from both ends of the printhead assembly, and comprising a casing in which the at least one printhead module is removably mounted.