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: 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.

Abstract: Disclosed is a device advantageously usable for dental therapy and examination, which is an elongated bundle of axially extending fibers. The elongated bundle is tapered at one or both of its ends, and the fibers are bonded to each other in places along their lengths so that the fiber bundle is coherent and the fibers define capillary passageways therebetween.

Abstract: An improved writing nib for a writing instrument comprising a casing and an ink reservoir in the casing. The nib comprises an outer cylindrical wall and equiangularly spaced inner partitions which are formed integral with the wall in cantilever fashion. Each inner partition has a transverse cross section which is comprised of a plurality of partially intersected circles of different diameter.

Abstract: An improved writing nib for a writing instrument comprising a cylindrical casing having an ink reservoir therein. Said nib has an inner capillary conduit which forms, in a transverse cross section of the nib, at least one straight slit which extends from the center of the cross section toward the outer periphery of said nib substantially in the radial direction of the cross section, and forms a plurality of radially spaced-apart arc shaped slits which are coaxial with each other about said center, a part of each of said arc shaped slits being interconnected with said straight slit.