Patent ID: 7984978

Claim:
An ink jet printing device with a head or with heads of parallel or serial-parallel type, comprising: a plurality of ejection modules each having chambers adapted for containing ink and heating elements adapted for commanding ejection of the ink, the chambers spaced apart from one another along an axis at a constant pitch, a nozzle plate including ejection nozzles located on a first side of the ejection modules, the ejection nozzles aligned with the chambers at the constant pitch, a support common to the ejection modules and located on a second side of the ejection modules, the support comprising a base plate of rigid material that defines through its thickness an elongated feeding duct for the ink, wherein the feeding duct extends substantially parallel to the axis, and a hydraulic seal forming a direct hydraulic connection between the ejection modules and the feeding duct, wherein the ejection modules are mounted side by side on said base plate and in direct hydraulic connection with the feeding duct, whereby the ejection nozzles and the chambers on the plurality of ejection modules are aligned with one another along the axis at the constant pitch.