Patent ID: 8851642

Claim:
An ink jet printer having an ink delivery system comprising an ink supply tank; first and second inkjet printheads located at different heights; first and second intermediate tanks located at different heights respectively below the heights of the first and second inkjet printheads; a pump for pumping ink from the supply tank into the first intermediate tank; a first level setting device for limiting ink pumped into the first intermediate tank to a first level and for directing additional ink pumped into the first intermediate tank to a first overflow region; a first ink supply line for supplying ink from the first intermediate tank to a first inkjet printhead; an ink transfer line for transferring the overflow ink under gravity from the first overflow region to the second intermediate tank; and a second ink supply line for supplying ink from the second intermediate tank to a second inkjet printhead; the first and second inkjet printheads mounted in a sheet medium transport mechanism for presenting a first surface of the sheet medium to the first inkjet printhead and for presenting a reverse surface of the sheet medium to the second inkjet printhead.