Pressure regulated inkjet printhead with replaceable on-axis ink tank

摘要

An inkjet printhead assembly includes: a reservoir for ink; an ink inlet for supplying ink to the reservoir; and an ink outlet disposed proximate a bottom side of the reservoir for supplying ink to a nozzle array; a first valve; a valve opening and closing mechanism for the first valve including: an inflatable bag immersed in ink and having an opening to atmosphere; and a biasing mechanism tending to force air to exit the bag; and a filter disposed in the reservoir of a printhead body, wherein the filter is tilted relative to a nozzle face; a replaceable ink tank including: an ink chamber; a vent to atmosphere; and a tank outlet disposed proximate a bottom side of the ink tank; a second valve disposed at the tank outlet; and an ink conduit for providing ink between the tank outlet and the ink inlet of the printhead body.

主权项

1. An inkjet printhead assembly comprising:
an inkjet printhead including:
a nozzle array for ejecting ink drops, the nozzle array being disposed in a nozzle face of a printhead die;a printhead body including:
a reservoir for ink;an ink inlet disposed proximate a top of the reservoir for supplying ink to the reservoir; andan ink outlet disposed proximate a bottom side of the reservoir for supplying ink from the reservoir to the nozzle array;a first valve disposed proximate the ink inlet of the printhead body;a valve opening and closing mechanism for the first valve including:
an inflatable bag immersed in ink in the reservoir and having an opening to atmosphere; anda biasing mechanism tending to force air to exit the bag through the opening; anda filter disposed in the reservoir of the printhead body, wherein the filter is tilted relative to the nozzle face of the printhead die; a replaceable ink tank including:
an ink chamber for storing a supply of ink;a vent to atmosphere; anda tank outlet disposed proximate a bottom side of the ink tank; a second valve disposed at the tank outlet; and an ink conduit for providing ink between the tank outlet and the ink inlet of the printhead body; wherein the ink chamber of the replaceable ink tank further includes: a first side extending from the bottom side of the ink tank, and a second side opposite the first side, wherein the second side is disposed proximate the printhead body, and wherein the tank outlet is disposed on the second side; wherein the printhead body further includes: a first side extending from the bottom side of the reservoir, wherein the first side of the printhead body is disposed proximate the second side of the replaceable ink tank; and a second side opposite the first side wherein an end of the filter disposed proximate the first side of the printhead body is located a first distance from the nozzle face of the printhead die, an end of the filter disposed proximate the second side of the printhead body is located a second distance from the nozzle face of the printhead die, and the first distance is greater than the second distance.