Abstract: The invention relates to a write head for ink printer devices comprising tubular ink channels which are surrounded over a part of their length by individually drivable small piezo tubes and which are situated proceeding between an ink supply part and the discharge openings of the write head. The ink channels applied to a carrier part form a pre-fabricatable channel block together with this carrier part. A channel plate is secured either to that side at which the ink channels end free or to the back surface of the carrier part. In one embodiment, the channel plate comprises a layer plate having through holes into which the free ends of the ink channels equipped with the small piezo tubes are pluggable. Transition channels for guiding the ink flow and the discharge openings of the write head for fashioned in further layer plates of the channel plate.

Abstract: The invention relates to a paper transportation device for printers, which use reel paper, having a motor-driven platen and one paper pressure roller which contacts the platen approximately at the center thereof so that it can be swung away in an elastic manner. The paper pressure roller is motor-driven such that the peripheral speed of the paper pressure roller leads the peripheral speed of the platen and by virtue of the arrangement of the paper pressure roller, the maximum possible angle of loop (.beta.) of the paper and the platen is achieved. This angle is delimited by the paper pressure roller and by a paper guidance channel which is aligned to lead tangentially away from the platen. The paper guidance channel is preceded by a device which produces a bias between the paper and the platen.