Abstract: A gear pump has a pair of gears a seal member for sealing up teeth of the gross engaging with each other in a sealed-up gear case, which seal member is provided at a place occupied by plurality of teeth in the vicinity of a working area of the teeth in a low pressure side of the gear case and is not connected to the gear case, the seal member having a low pressure fuel the flow of hole for flowing a low pressure fuel, wherein a tooth sealing angle for the plurality of teeth is set substantially to a value within a range of 35.degree..+-.5.degree. for gears having of 14 to 18 teeth, and a high pressure fuel flowing passage for the flow of a high pressure fuel, formed in a space other than the working area of the teeth and the area of and the sealing member, in the gear case.

Abstract: A fuel feeding apparatus includes a pressure increasing piston system, in addition to a high pressure fuel pump, for further increasing the fuel pressure at the outlet of the high pressure fuel pump. For this purpose, a first piston provided in a first cylinder is moved in response to the pressure of fuel drawn up from a fuel tank and fed to the high pressure pump by a low pressure fuel feed pump, and a second piston provided in a second cylinder and having a diameter smaller than the diameter of the first piston is connected to the first piston and is moved together with the first piston for pressurizing fuel in the second cylinder communicating with the outlet of the high pressure fuel pump at the time of engine starting, and before the high pressure fuel pump is started.

Abstract: An image recording apparatus including a recording electrode having electrode needles aligned in columns, a driving circuit for individually applying an image recording voltage to the electrode needles of the recording electrode, a recording medium composed of a conductive layer and a surface insulating layer, and a voltage circuit for applying a predetermined voltage between the recording medium and the electrode needles, whereby fog on the recorded image can be avoided.

Abstract: A printing machine according to the present invention, comprises electrically conductive and magnetically inductive printing toner, an array of electrode-needles contacting with toner, each of the electrode-needles arranged apart from the adjacent electrode-needles in the array and individually energized in accordance with a desired printing pattern to electrify the toner communicating electrically with the energized electrode-needle, recording means including an electrically conductive portion and an insulating surface which extends on the electrically conductive portion and is arranged away from the array of electrode-needles to face thereto and to contact with the toner arranged between the electrode-needles and the insulating surface, the voltage applied to the electrically conductive portion being positive when the voltage applied to the energized electrode-needles is negative or the voltage applied to the electrically conductive portion being negative when the voltage applied to the energized electrode-

Abstract: An electrostatic recording head for causing a developing agent to be electrostatically deposited on the surface of a recording member in accordance with a recorded image, comprising a recording electrode having a plurality of linear electrodes arranged in a common plane at a predetermined interval; a magnet disposed at one side of the recording electrode; and a magnetic member disposed at the side of the recording electrode opposite to the magnet; the magnet being disposed such that the magnetic lines of force pass through the end of the recording electrode towards the portion of a recording member opposed by the end of the recording electrode. The present invention also relates to a method of producing this electrostatic recording head. The invention also is concerned with an image recording apparatus which employs this electrostatic recording head, as well as with a developing agent supplying device and a display device.

Abstract: A method and an apparatus for recording an image is disclosed, in which toner is supplied between a conductive recording drum covered with an insulating material and recording electrodes with the forward end thereof with a small gap from the drum and inclined at a great angle upstream of the direction of rotation of the recording drum. A toner carriage force is generated in the toner to flow out downstream by rotation of the recording drum. A permanent magnet is arranged in the recording drum to form a toner chain inclined at a great angle downstream of the recording drum from the forward end of the recording electrodes. The component of the magnetic force of the magnet in the direction of drum movement is balanced with the toner carriage force.

Abstract: Electromagnetic toner is supplied to the surface of the image development drum formed of a hollow aluminum covered with electric insulation; a permanent magnet is installed in the hollow portion of the image development drum; a recording electrode is provided on the surface side of the image development drum with a small gap formed between the drum surface and the electrode; a voltage is applied between the recording electrode and the image development drum according to the image to be recorded; the image development drum is turned to form a toner image on its surface; and the toner image formed on the drum surface is then transferred onto a recording sheet.

Abstract: A printing hammer driving apparatus for high-speed printers comprises a lever member acting as a hammer operating part, an armature forming a part of a magnetic circuit, and an electromagnet forming, together with the armature, the magnetic circuit. The lever member has a rotational supporting point at the base end thereof and is made of a light-weight non-magnetic material. The armature is projected in one of the rotational directions of the lever member from the intermediate part of the lever member. The electromagnet has at least one core and an exciting coil wound on the core. A core has a magnetic pole face perpendicular to the direction of attraction of the armature and a magnetic pole face parallel to the direction of attraction of the armature.