Patent ID: 6908180
Filing Date: 2005-06-21
Classification: B41J

Abstract:
1. An ink delivery apparatus for an inkjet printhead, comprising an ink reservoir for delivering some ink at a slight negative pressure to a printhead, a pressure regulator and an ink replenishment mechanism that maintains substantially constant negative pressure in said reservoir when some ink in said reservoir is delivered to the printhead and in response to the ink delivery replenishes some ink to said reservoir from an ink supply source, is characterized in that: said pressure regulator and said ink replenishment mechanism includes a pressure regulator member that air-tightly covers an opening in said reservoir and is compliant to maintain substantially constant negative pressure in said reservoir, and a replenishment activator connected to said pressure regulator member outside said reservoir to avoid being exposed to the ink and which initiates an ink replenishment to said reservoir when some ink in said reservoir is delivered to said printhead.