US Patent 7808669 Duplex printer with a pair of ink transfer rollers

A duplex printer includes a body defining one or more spaces in which respective ink cartridges can be placed. A pair of print engines is mounted within the body and a print media path is defined there-between. Each print engine includes at least one printhead coupled in fluid communication to the ink cartridges and configured to eject ink supplied from the ink cartridges. Each print engine also includes a transfer roller rotationally mounted relative to the body to receive ink ejected from said printhead. Each transfer roller engages with the print media fed along the print media path so that the received ink is transferred to the fed print media.