Ink cartridge with printhead maintenance station for inkjet printer

1. A cartridge for an inkjet printer, the cartridge having a body removably mountable to the inkjet printer, the body comprising:

a printhead having an array of ink ejection nozzles;

at least one air vent in the body;

at least one ink storage compartment having a deformable ink bag which is air tight and purged of air through fluid connection with the at least one air vent;

an ink feed system for supplying ink from the or each ink compartment to the printhead; and,

a maintenance station for engaging the printhead to perform one or more maintenance functions,

wherein the ink storage compartment has a displaceable wall section biased to expand the ink bag to generate a negative pressure therein, such that ink does not inadvertently leak from the ink ejection nozzles of the printhead.

2. A cartridge according to claim 1 wherein the maintenance station has a capper for capping the array of nozzles and a cleaner for cleaning the printhead, the cleaner being positioned between opposing sides of the capper.

3. A cartridge according to claim 2 wherein both the capper and the cleaner are independently movable relative to the array of nozzles.

4. A cartridge according to claim 3 wherein the cleaner wipes across the array of nozzles as the maintenance assembly moves from a capped position to an uncapped position.

5. A cartridge according to claim 4 wherein the printhead is a pagewidth printhead, the array of nozzles is elongated and the cleaner is likewise elongated; wherein, a motorized drive actuates both the capper and the cleaner.

6. A cartridge according to claim 1 , wherein the ink storage compartment is arranged to receive a refill unit for refilling the ink storage compartment, the ink storage compartment having an interface for receiving the refill unit, the interface having an inlet valve biased to its closed configuration, the refill unit comprising:

a body containing a quantity of ink;

engagement formations for releasably engaging the interface; and

an inlet valve actuator for opening the inlet valve as the refill unit engages the ink interface so that the ink in the body is in fluid communication with the ink storage compartment.

7. A cartridge according to claim 1 , wherein:

the cartridge further comprises an interface for receiving a refill unit for refilling the ink storage compartment, the interface having a normally closed inlet valve and a normally open outlet valve, both in fluid communication with the ink storage compartment; and

the refill unit comprises a body containing a quantity of ink and a docking portion having an ink outlet and valve actuator formations; and

during use, the docking portion releasably engages the interface to actuate the inlet and the outlet valves so the cartridge fills with ink from the body because of the negative pressure in the ink storage compartment.

8. A cartridge according to claim 1 , wherein the ink storage compartment is arranged to receive a refill unit for refilling the ink storage compartment via a normally open outlet valve, the refill unit comprising:

a body containing a quantity of ink;

engagement formations for releasably engaging the ink storage compartment; and

an outlet valve actuator for closing the outlet valve as the refill unit engages the ink storage compartment.

9. A cartridge according to claim 1 , wherein:

the ink storage compartment is arranged to receive a refill unit for refilling the ink storage compartment;

the refill unit comprises a body containing a quantity of ink, an ink outlet and a repressurizing arrangement;

upon engagement of the refill unit with the ink storage compartment, the repressurizing arrangement causes part of the unit to be inwardly depressed as the ink from the body is drawn into the ink storage compartment through the ink outlet by the negative pressure until pressure equalization; and

upon subsequent disengagement of the refill unit from the ink storage compartment, the repressurizing arrangement releases the inwardly depressed part of the ink storage compartment to re-establish the negative pressure.

10. A cartridge according to claim 1 , wherein:

the ink storage compartment has an interface for releasably engaging with a refill unit for refilling the ink storage compartment, the interface having valves for controlling ink flows into, and out of, the storage compartment; and

the refill unit comprises a body containing a quantity of ink, an ink outlet and valve actuators for actuating the valves when the refill unit engages the interface, such that the valve actuators actuate the valve in a predetermined sequence.

11. A cartridge according to claim 1 , wherein:

the cartridge is arranged to form part of the inkjet printer and to receive a refill unit for refilling the cartridge;

the printer has the printhead, control circuitry and an interface for releasably engaging the refill unit; and

the refill unit comprises a body containing a quantity of ink, an ink outlet and a memory circuit for storing information relating to at least one characteristic of the ink, wherein, during use, the memory circuit allows to the control circuit to interrogate it to verify that the ink in the refill unit is suitable for the printer.

12. A cartridge according to claim 1 incorporating a printhead maintenance assembly for the printhead, wherein:

the printhead has a nozzle plate with the array of nozzles formed therein; and

the printhead maintenance assembly comprises:

a capper to cover the array of nozzles when the printhead is not in use; and,

a cleaner for engaging the nozzle plate and wiping across the nozzles, the cleaner being positioned between opposing sides of the capper.

13. A cartridge according to claim 1 , wherein the inkjet printer comprises:

a maintenance assembly for moving between a capped position where the assembly covers the array of nozzles, and an uncapped position spaced from the array of nozzles; and

a motorized drive for moving the maintenance assembly between the capped position and the uncapped position.

14. A cartridge according to claim 1 , further comprising an interface for engaging an ink refill unit for replenishing the cartridge, wherein the ink refill unit comprises:

an ink storage compartment;

a docking portion for engaging the interface of the cartridge, the docking portion having a base plate with an ink outlet for connection to an inlet port on the interface; and

engagement formations for releasably engaging the interface, the engagement formations being formed on the transverse centre line of the base plate, the centre of the ink outlet being spaced from the transverse centre line.

15. A cartridge according to claim 1 , further comprising an interface for engaging an ink refill unit for replenishing the cartridge, wherein:

the ink storage compartment is partially defined by a tubular flexible wall;

the cartridge further comprises a constriction mechanism for constricting the flexible tubular wall by a predetermined amount; and

the ink refill unit comprises a body containing a quantity of ink and a docking portion for engaging the interface of the cartridge, the docking portion having an ink outlet for connection to an inlet port on the interface, and a plurality of constriction actuators for actuating the constriction mechanism as the ink refill unit engages the interface and releases the constriction mechanism as the ink refill unit disengages the interface.

16. A cartridge according to claim 1 , further comprises an interface for engaging an ink refill unit for replenishing the cartridge, the ink refill unit comprising:

a body containing a quantity of ink;

an ink outlet for engaging a complementary ink inlet in the interface; and

a spigot extending from the body for insertion in an aperture in the interface,

wherein the lateral cross section of the spigot is keyed to the shape defined by the aperture to ensure the ink refill is correctly matched to the cartridge.

17. A cartridge according to claim 1 arranged to receive an ink refill unit for replenishing the cartridge, the ink refill unit comprising:

a body containing ink;

an ink outlet for engaging a complementary ink inlet in the cartridge; and

a visual indicator to provide a visual indication when a predetermined quantity ink has flowed from the refill unit into the cartridge.

18. A cartridge according to claim 1 , wherein the inkjet printer comprises:

an outer casing with a hingedly mounted panel for access its interior; and

a cradle housed within the outer casing for supporting an ink cartridge, the cradle having a hingedly mounted lid that opens to allow the ink cartridge to be inserted and removed,

wherein the hinge axis of the lid and the hinge axis of the panel are parallel, and

the lid and the panel both open in the same direction.