The invention provides for a driven mechanism for a cradle unit which operatively receives a cartridge to form an inkjet printer. The driven mechanism includes a motor with a transmission assembly. A rotor element drive assembly is mechanically coupled to the transmission assembly for operating a rotor element of the cartridge. A print media transport assembly is mechanically coupled to the transmission assembly and configured to transport print media across a printhead integrated circuit of the print cartridge during printing. An air compressor is mechanically coupled to the transmission assembly for providing compressed air to keep the printhead integrated circuit clear of debris.