Printing system having power storage printhead cartridge interface

1. A printing system comprising:

a printhead cartridge comprising a printhead;

a cradle unit for supporting the printhead cartridge; and

an interface at which the cradle unit is removably engageable with the printhead cartridge, the interface comprising connections for connecting the printhead cartridge with a power supply which is remote from the interface, print control circuitry of the cradle unit, and a power storage circuit for storing at least some of the power being supplied to the printhead cartridge from the power supply,

wherein the interface incorporates a first printed circuit board, the connections and power storage circuit being arranged on the first printed circuit board, and the print control circuitry is incorporated on a second printed circuit board, and

the first and second printed circuit boards have complementary connectors which cooperate to provide the connection of the printhead cartridge and print control circuitry, the complementary connectors being arranged so that the first printed circuit board is able to pivot with respect to the second printed circuit board.

2. A printing system according to claim 1 , wherein the first printed circuit board is arranged so as to substantially orthogonally project from the second printed circuit through the cooperation of the complementary connectors.

3. A printing system according to claim 1 , wherein the power storage circuit is incorporated in a power regulation circuit of the interface, the power regulation circuit being configured to regulate the supply of power from the power supply to the printhead cartridge.

4. A printing system according to claim 3 , wherein the power regulation circuit is configured to regulate the supply of power from the power supply so that ink ejection nozzles of a printhead incorporated in the printhead cartridge receive substantially constant power.

5. A printing system according to claim 3 , wherein the power regulation circuit is configured to output a regulated voltage up to 5.5 Volts from a supply of 12 Volts from the power supply.

6. A printing system according to claim 5 , wherein the power regulation circuit is configured to output a regulated current of 3.5 Amps from a supply of 2 Amps from the power supply.

7. A printing system according to claim 5 , wherein the power regulation circuit is configured to output the regulated voltage with a maximum variation of 100 milliVolts.