Abstract: A pen nib preferably for use in a high speed writing, having a coaxial capillary passage for ink. The coaxial passage extends axially in the nib body, and has, in a cross-sectional view, a coaxial portion, a plurality of outer portions and intermediate connecting portions between the coaxial portion and respective outer portions. The coaxial passage partially opens axially at peripheral openings formed in a round or sharped head of the nib, that is the coaxial portion and intermediate portions are all closed axially at the head, and the outer portions are open axially at the peripheral openings formed such that they are arranged at a top surface of the head around the center thereof. The intermediate passage portions may be open radially at the peripheral openings. The nib is made of hard and wear material such as metal, ceramic or thermosetting resin by an injection molding with a subsequent heat treatment.

Abstract: A pen tip structure comprises (1) an elongated stem which defines a cylindrical outer surface and a flat end surface, the flat end surface including one or more grooves which extend from the cylindrical outer surface radially inwardly towards a center point thereof, (2) a tube positioned around the elongated stem, the tube including inwardly-extending protrusions that form at least one longitudinal ink flow channel along the cylindrical outer surface of the elongated stem, and an end portion which is located beyond the flat end surface of the elongated stem, the end portion providing a mouth, and (3) a rotatable member positioned between the noted mouth and the flat end surface of the elongated stem, the rotatable member having a surface portion which extends beyond the mouth for conveying ink to a receiving surface and an opposite surface portion for receiving ink supplied thereto by capillary action.

Abstract: An apparatus for producing a continuous rod having a capillary or capillaries, adapted for the writing nib of a writing instrument. The apparatus is comprised of a tubular body and a core arranged in the body. The core is provided with a plurality of radial slits. The apparatus is further provided with a restricted portion facing an outer periphery of the core for controlling the amount of melted material passed through the nozzle.

Abstract: An improved writing instrument comprising a casing, ink reservoir in the casing, a longitudinal nib having a capillary passage for the ink in the ink reservoir, and a longitudinal nib holder, with a bore, of a thermoplastic material which is fixedly mounted to the casing, the nib being inserted into the holder so that the forward end portion and the rear end portion of the nib are projected outwardly from the holder and being fixed to the holder with an adhesive material at a place between the forward end portion and the rear end portion of the nib, while the holder at the tip edge thereof is deformed so that the inner surface of the holder is in tight contact with the nib around the circumference thereof.