an ink jet printer in which a roll of paper is stored within an imaging drum and feeds through a longitudinal opening in the drum to the outside , passes around the drum , where it is held in place during the imaging process , and then ejected from the drum and cut off . while the imaged sheet is being ejected from the drum , the next length of paper is drawn from the interior of the drum and around the outside of the drum in position for the next imaging operation . the paper is withdrawn from the drum by a traction roller that engages only the center portion of the paper to prevent the paper from skewing because of unequal forces applied to the edge portions of the paper . the same traction roller is also used in a reverse mode to tension the paper around the drum .