Patent ID: 7878629

Claim:
A printer module comprising: a housing surrounding a frame and defining footing holes; a print engine housed within the housing and having a pair of opposed print head assemblies for enabling double-sided printing on print media to be effected, each printhead assembly including a print media engaging roller and a pair of adjacent printheads configured to eject ink, each printhead having a molding defining an edge portion which is arcuate and a plurality of ink inlets and an ink ejecting integrated circuit mounted to an end of the molding in fluid communication with the ink inlets; and feet extending from the housing and spaced apart to engage in respective footing holes defined in the housing of another printer module so that the printer modules can be stacked together; wherein, the arcuate edge portion has a radius of curvature approximating that of the print media engaging roller to allow the print media engaging roller to nest adjacent the arcuate edge portion such that during use the ink ejecting integrated circuit is positioned on the arcuate edge portion proximate a point of contact between the print media engaging roller and the print media.