AN APPARATUS FOR PURGING AIR, SURFACE BLOCKAGE OR INTERNAL BLOCKAGE FROM A FLUID JET APPARATUS, AND A FLUID JET APPARATUS

摘要

A purge/clean system and an associated method for a fluid jet apparatus, such as an ink jet printing system, having a fluid chamber including a chamber wall having an exterior surface and at least one orifice through which fluid is ejected from the fluid chamber toward a substrate involves a cavity defined adjacent the exterior surface of the chamber wall into which fluid which is expelled from the at least one orifice during a purging or cleaning operation is permitted to flow and a vacuum pump for withdrawing fluid which is contained within the cavity. The cavity can be provided by a plurality of plates arranged in an assembled, or stacked, relationship against the exterior surface of the chamber wall and, with the aid of a fan or compressor, can be used to create a zone of above-atmospheric pressure adjacent the exterior surface of the printer head. With the zone of above-atmospheric pressure created within the cavity, any leakage of air from the region into the atmosphere effects a flow of air out of the region and thereby helps to maintain the at least one orifice in a relatively clean condition.