Patent ID: 8500257

Claim:
An ink pressure regulator for regulating a hydrostatic pressure of ink supplied to an inkjet printhead, said regulator comprising: an ink chamber having an ink outlet for fluid communication with the printhead via an ink line, wherein a roof of the ink chamber comprises: an air inlet; a regulator channel having a first end communicating with the air inlet and a second end communicating with a headspace of the chamber, said second end defining a bubble outlet; and a liquid-retaining structure in fluid communication with the regulator channel, said liquid-retaining structure being positioned and configured for capturing ink from the headspace of the ink chamber, wherein said regulator channel is dimensioned to regulate a hydrostatic pressure of ink supplied to the printhead; and wherein said regulator is positioned between first and second wetting chambers, and wherein said liquid-retaining structure defines a wall of at least one of said wetting chambers.