Mitsubishi Pencil Kabushiki Kaisha

Mitsubishi Pencil Company, Limited

Kazuhiko Furukawa

Yojiro Sano

Takeo Fukumoto

Seiichi Kobayashi

Hiroaki Koyama

Tooru Nakajima

Kiyoshi Fujisawa

Yosuke Mito

Takeshi Kobayashi

Yusuke Kobayashi

Seiichi Maruyama

Toru Kitao

Yusuke Nakamura

Atsushi Nakashima

Kazuhiko Takanashi

Shuji Ichikawa

Katsuhiko Shiraishi

Atsushi Nakajima

Masashi Sakagami

Yoshiharu Namiki

Yoshihide Ishii

Norio Ogura

Hiroyuki Muto

Kensuke Inoue

Kengo Nagaoka

Sakae Hayao

Eiji Wasai

Yoshihiro Manta

Masanobu Kiritake

Mitsuhiro Ohashi

Tomoyuki Akagi

Daisen Kato

Hisanori Yanagi

An input pen is disclosed including a wood shaft, a mounting hole that is formed at an axial center of the wood shaft, and an input body that is rod-shaped and is mounted in the mounting hole, and wherein an inner side surface of the mounting hole and an outer side surface of the input body are fixed.

Input pen and method of manufacturing input pen

A ballpoint pen is provided in which the width of the drawing line can be changed, wherein responsiveness can be improved when distinguishing between drawing thin lines and thick lines. A ballpoint penprovided at the pen tip side with a first writing part having a writing ball, wherein the ballpoint penis characterized by being provided with a writing part at the pen tip side with which it is possible to write a thicker line than the line written with the first writing part, only the first writing part being used when the writing weight is 1 g and the writing angle is 90&#xb0;, and the second writing part being used when the writing weight is 200 g, and the writing angle is 40-90&#xb0;.

Ballpoint pen

Provided is a knock type writing instrument provided with a simple mechanism allowing a stable fretting operation or the like. A knock type writing instrumentis provided with: a shaft cylinder; a refillarranged inside the shaft cylinder; a springbiasing the refillbackward; an operation partpressed forward against a biasing force of the springin a knocking operation; and a main rotor, and is switchable between a writing state and a non-writing state with the knocking operation. The knock type writing instrumentis further provided with: a knock locking membermovable forward and backward inside the shaft cylinderdue to gravity; and a locking partprovided on a side of the shaft cylinderand capable of being locked with the knock locking member. When a front end of the shaft cylinderis directed upward, the knock locking membermoves backward to be locked with the locking partto prevent forward movement of the operation part

Knock type writing instrument

A writing implement is provided which is designed to draw lines using capillary action, wherein the width of the line can be freely adjusted while the line is being drawn and it is possible to draw lines of almost the same width at the beginning of the use of the writing implement as at the end of use. A felt-tip penis provided with an ink reservoir, a collector, and a corefor drawing by capillary action the ink that has been dispensed by the collector, dispensing the drawn ink from the tip, and adhering same to a paper surface. Even in repetitive writing, the rate of variability in the width of the lines drawn at the end of use with respect to the width of lines drawn at the beginning of use is 10% or less.

Writing instrument

Lines can be freely varied in thickness, and lines with characteristics such as 'stops', 'flicks', and &#x201c;sweeping strokes&#x201d; can be written easily, even with a felt-tip pen, marker pen, or the like. Moreover, a pen-tip does not readily become damaged or worn. A writing implement includes a shaft, an ink supply core such as that of a felt-tip pen or a marker pen, and a core surrounding member that covers the ink supply core. The writing implement is formed capable of contacting a tip of the ink supply core and a tip of the core surrounding member against a writing surface at the same time by using a joint capable of changing a relative positional relationship between the ink supply core and the core surrounding member.

Writing implement

A writing implement in which a joint connecting an ink supply section and a ballpoint pen tip together is configured from three members. The three members configuring the joint are a substantially cylindrical center member, a substantially cylindrical surrounding member formed at the outer periphery of the center member, and an interposing member that is molded by a soft member molded so as to cover the outer periphery of the center member and the surrounding member. An annular gap section is provided between the center member and the surrounding member. The leading end of the ink supply section is fitted into the gap section. The joint is formed by two color molding. The center member and the surrounding member are molded by primary molding, and the interposing member is integrally molded onto the center member and the surrounding member by secondary molding.

A ballpoint pen wherein an outer member () covering the outer circumference of a holder () covers a section that reaches as far as a narrowed section () of the holder () and has an outer member tip end portion (). An ink spreads between the writing ball () and the contact section of the writing surface and between the outer member tip end portion () and the contact section of the writing surface, in which the writing ball () and the outer member tip end portion () are in contact with the writing surface at the same time. The relative position of the outer member () and the holder () can be changed from a holder protruding position to a holder retracted position wherein the writing ball () and the tip section of the outer member () can be in contact with the writing surface at the same time.

Ball pen

A writing implement that prevents flow of air into an ink tank and prevents writing failure while allowing for productivity. The writing implement includes a writing implement refill having: an ink tank composed of films storing ink; a joint connected to a tip of the ink tank; and a writing tip connected to a tip of the joint. An inner circumferential surface of the tip of the ink tank covers an outer circumferential surface of a rear end of the joint. A covering member of a ring shape covers from outside an area where the tip of the ink tank covers the outer circumferential surface of the rear end of the joint.

Writing implement refill and writing implement

A writing implement is provided including a knock mechanism, in which, without obstruction of normal operation, impact can be cushioned by a damper space that is sealed off from the outside. The writing implement () including the knock mechanism capable of advancing a writing tip () by push-out operation, includes: a holding section () for holding the writing tip (); a shaft tube () for containing the holding section (); a knock section () for covering a rear end portion of the shaft tube (); a push-out section () for pressing the holding section () toward a front end in operative association with push-out operation of the knock section (); and the damper space () provided between the knock section () and the shaft tube (), being sealed off from the outside, and changing its volume by push-out operation of the knock section ().

There is provided a ballpoint pen tip in which a shoulder of a bent portion does not touch a paper surface during writing and bleeding caused by deformation of an inner periphery of the bent portion can be prevented, and an ink refill using thereof. The ballpoint pen tipcomprises a first tapered surfaceformed by tapering an outer periphery at a front end of a holdera connecting surfacethat is formed at a front end side of the first tapered surfaceand has an outside angle larger than 180&#xb0; with respect to the first tapered surface, a second tapered surfacethat is formed at a front end side of the connecting surfaceand has an outside angle smaller than 180&#xb0; with respect to the connecting surface, and a bent portionin which a front end portion of the second tapered surfaceis bent inwardly so as to hold a writing ballinserted into a ball houseA boundary between the first tapered surfaceand the connecting surfaceis referred to as a first shoulder portion, and a boundary between the second tapered surfaceand the bent portiona second shoulder portion. The second shoulder portionis located inside a virtual tangent linebetween the first shoulder portionand the writing ball

Ball-point pen tip and ink refill

A gas-pressurized writing instrument simply constructed so that a compressed gas will not escape to the outside by providing a writing point assembly () at the front end () of a tube member (), storing an ink () to be fed to the writing point assembly () in the tube member (), encasing at least part of the tube member () by a casing cylinder () so as to form a space () communicating with the rear opening of tube member (), and sealing a compressed gas inside the space () so that the compressed gas will push the ink out to writing point assembly () to secure the writing performance, wherein the casing cylinder () is formed of a material that presents low gas permeability or gas impermeability.

Gas pressurized writing instrument and writing instrument refill

A gas-pressurized writing instrument simply constructed so that a compressed gas will not escape to the outside by providing a writing point assembly () at the front end () of a tube member (), storing an ink () to be fed to the writing point assembly () in the tube member (), encasing at least part of the tube member () by a casing cylinder () formed of a material that presents low gas permeability or gas impermeability so as to form a space () communicating with the rear opening of tube member (), sealing a compressed gas inside the space () so that the compressed gas will push the ink out to writing point assembly () to secure the writing performance, and covering the outer periphery of the casing cylinder () with an exterior member having thermal resistance or/and moisture resistance greater than that of the casing cylinder so that the casing cylinder can present low gas permeability or gas impermeability.

Gas-pressurized writing instrument and writing instrument refill

A writing point assembly and an ink tube and/or a holder can be welded appropriately at a predetermined area without using ultrasonic waves, so as to be able to prevent dislodging of the writing point assembly, ink leakage and the like. The rear end part, of a metallic writing point assembly as a part of a writing instrument, is inserted into a joint, and is heated at the predetermined area (at least the fitted area in contact with the front end part of the joint), so as to weld the predetermined area of the writing point assembly to the surrounding part of the joint.

Writing instrument and welding method of writing point assembly and writing instrument parts connecting structure and connecting method

Provided is a writing instrument comprising an ink tank, an ink holder which can hold an ink, a pen tip, an ink guiding part for guiding the ink in the ink tank to the pen tip and an ink occlusion body which can feed the ink to the ink guiding part and which has an outer skin, wherein through parts are provide in the outer skin of the ink occlusion body.

Production processes for writing instrument and ink occlusion body

In order to provide an ink reservoir for a writing instrument which has satisfactory permeation resistance and moisture-absorption resistance against permeation of a solvent and absorption of moisture and which is excellent in a storing property of the ink with the passage of time, an ink reservoir for a writing instrument in which an ink for a writing instrument is stored is constituted of at least one selected from the group consisting of a cyclic olefin resin, a fluorine base resin and a high molecular weight olefin resin or the ink reservoir for a writing instrument described above is constituted of a laminated structure which is formed by extrusion molding of two or more kinds of thermoplastic resins.

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Yokohama, Japan

Kazuhiko Furukawa