An imaging cartridge for a computer system, which is installed in a computer system to facilitate continuous document conveying process without any removable solid document cassette and additional document positioning process, comprises a cartridge housing for accommodating required imaging components; a roller-type document feeding unit, located at one side of the cartridge housing for carrying out continuous document conveying in and out operation of the imaging cartridge; a driving unit, located inside the cartridge housing for driving the document feeding unit; and a scanning unit, located inside the cartridge housing with a distance to the document feeding unit, for converting the imaging data into electrical signals.