US Patent 7891803 Double-sided printer having opposed print engines

A double-sided printer having two print engines are arranged on opposite sides of a print media path. Each print engine comprises an image transfer roller configured to operatively transfer an image onto a sheet of paper fed through the media path; an ink cartridge having an integrated printhead for printing onto said image transfer roller, said printhead spanning a width of the image transfer roller, and having an elastomeric capping seal; a cleaning station configured to clean the image transfer roller after said image is transferred to the paper; and a solenoid arrangement configured to park the elastomeric capping seal of the printhead against the transfer roller when the printer is not operational, and to move the printhead from the roller when the printer is operational. The elastomeric capping seal is provided on two sides of the printhead chip transverse to the span of the printhead.