Inkjet printhead with electrical disconnection of printhead prior to removal

1. An inkjet printer comprising:

a replaceable pagewidth printhead with an array of nozzles and printhead contacts for transmitting power and print data to the nozzles; and,

corresponding contacts for supplying the power and print data to the printhead contacts; and,

a cover member for movement between open and closed positions; wherein,

in the open position, the printhead can be installed or removed, and the cover member is in the closed position during printing; such that,

the printhead contacts and the corresponding contacts are moved into engagement when the cover member is moved to the closed position, and the printhead contacts and the corresponding contacts disengage by moving the corresponding contacts a predetermined distance away from the printhead contacts when the cover member is moved to the open position.

2. The inkjet printer according to claim 1 wherein the cover member is a lid on a cradle in which the printhead sits during use.

3. The inkjet printer according to claim 2 wherein the lid moves the corresponding contacts into and out of biased engagement with the printhead contacts.

4. The inkjet printer according to claim 3 wherein the printhead is a pagewidth printhead and the printhead contacts extend along its length.

5. The inkjet printer according to claim 2 wherein the lid uses a lever mechanism to disengage the contacts.

6. The inkjet printer according to claim 1 , further comprising a cartridge unit for an inkjet printer, the cartridge unit comprising:

an ink storage compartment and an ink feed system for connection to the printhead,

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

7. The inkjet printer according to claim 1 , further comprising an ink cartridge comprising:

an ink storage compartment having opposed wall sections connected by a flexible wall arrangement to define a variable ink storage volume; and

an ink feed system for supplying ink to the printhead,

wherein one of the opposed wall sections is displaceable and biased to expand the variable ink storage volume to create a negative pressure in the ink storage compartment for avoiding inadvertent ink leakage from the nozzles.

8. The inkjet printer according to claim 1 , further comprising a printhead maintenance assembly for the printhead, the printhead having a nozzle plate with an array of nozzles formed therein, the printhead maintenance assembly comprising:

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,

wherein the cleaner is positioned between opposing sides of the capper.

9. The inkjet printer according to claim 1 , further comprising:

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.

10. The inkjet printer according to claim 1 , further comprising:

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.