Ink refill unit with a working outlet and other dummy outlets

1. An ink refill unit for refilling a printer ink cartridge unit, the ink refill unit comprising:

a base assembly which houses internal ink refilling components and defines a plurality of outlets for docking with the cartridge unit, each outlet corresponding to a respective type of ink with only one of the outlets working;

the ink refilling components including a syringe assembly coupled in fluid communication with the working outlet; and

a lid assembly which fits onto the base assembly to cover the ink refilling components.

2. An ink refill unit as claimed in claim 1 , wherein the base assembly includes a clip arrangement for securing the ink refill unit in place when refilling the ink cartridge unit.

3. An ink refill unit as claimed in claim 2 , wherein the clip arrangement includes clip portions in the form of projections that project from a resilient arm, the arm being depressible to move into and out of a recess about a pivot region.

4. An ink refill unit as claimed in claim 3 , wherein the pivot region is a weakened region in the surface of the base assembly.

5. An ink refill unit as claimed in claim 1 , wherein the syringe assembly includes:

a tank for storing ink and defining an ink ejection port; and

a syringe seal mounted on a plunger which is received within the tank to expel the stored ink from the ink ejection port.

6. An ink refill unit as claimed in claim 5 , wherein the syringe assembly further includes a biasing means received within the plunger and configured to bias the plunger further into the tank when the syringe assembly is housed within the base assembly.

7. An ink refill unit as claimed in claim 6 , wherein the syringe assembly further includes a pawl-and-ratchet control arrangement for providing incremental delivery of ink in the tank out through the ink ejection port.