Positive pressure air system for inkjet print head

摘要

A positive air system (12), for a fluid jetting device (10) that jets a liquid in a fluid droplet path prevents the ingress of dust and debris to the liquid jetting device and further prevents the introduction of dust and debris into the liquid droplet path. The air system (12) includes an enclosure having at least one wall (18) defining a barrier (20) and enclosing the liquid jetting device (10). The barrier (20) defines a local environment. The at least one wall (18) has a plurality of orifices (22) formed therein that are configured to direct a stream of pressurized air therefrom in a direction that diverges from the liquid droplet path. The liquid droplet path and the pressurized air stream direction do not converge so that the pressurized air flowing from the orifices (22) does not interfere with the liquid moving through the droplet path. <IMAGE>