Abstract: To prevent ink from dripping, drying, and the like. A writing utensil includes: a shaft tube; a writing chip that protrudes more toward the front than the shaft tube so as to discharge ink when pressed against a written face; and an ink supply part that supplies ink to the writing chip from a rear side, wherein the writing chip is at a separate position that is separated toward the front across a space with respect to the ink supply part and is moved due to a predetermined operation to a contact position where the writing chip comes into contact with the ink supply part from a front side.

Abstract: A retractive writing utensil includes a shaft tube, a core stored in the shaft tube in such a manner as to protrude from a front end of the shaft tube when moved forward, and an urging member that is stretched and contracted in the shaft tube in a front-rear direction, wherein the urging member is located adjacent to the core radially outward in such a manner that the center of the urging member is positioned radially outside the core, and urges the core rearward.

Abstract: To prevent ink from dripping, drying, and the like. A writing utensil includes: a shaft tube; a writing chip that protrudes more toward the front than the shaft tube so as to discharge ink when pressed against a written face; and an ink supply part that supplies ink to the writing chip from a rear side, wherein the writing chip is at a separate position that is separated toward the front across a space with respect to the ink supply part and is moved due to a predetermined operation to a contact position where the writing chip comes into contact with the ink supply part from a front side.

Abstract: The diameter of the urging member can be made independent of the outer diameter of the core. A retractive writing utensil includes a shaft tube, a core stored in the shaft tube in such a manner as to protrude from a front end of the shaft tube when moved forward, and an urging member that is stretched and contracted in the shaft tube in a front-rear direction, wherein the urging member is located adjacent to the core radially outward in such a manner that the center of the urging member is positioned radially outside the core, and urges the core rearward.

Abstract: In a writing utensil with a pressurizing mechanism, a cylinder is provided such that it comes into sliding contact with an outer peripheral part of a valve element and moves back and forth. An inner wall face of the cylinder is provided with a ventilating recess communicating with outside air, and an annular non-pressure contact face is positioned on the rear side of the ventilating recess. When the cylinder moves forwardly, the valve element is brought into pressure contact with the non-pressure contact face to seal the pressurizing chamber and when the cylinder moves backwardly, the valve element is moved forward and is separated from the non-pressure contact face, such that the ventilating recess communicates with the pressurized chamber.

Abstract: A mechanical pencil unit is provided which includes: a holding tube; a holder which is inserted into a front side opening portion of the holding tube and which protrudes forward from a front end of the holding tube, and moreover which is supported so as to be back and forth movable relative to the holding tube; a pencil lead delivering mechanism which delivers forward a pencil lead x inserted into the holder; and a movement direction conversion mechanism which causes the holder to go forward relative to the holding tube and the pencil lead x by using a force applied in a radial direction from the pencil lead x to the holder, wherein the pencil lead delivering mechanism is provided at a position further toward a rearward side than the holder and the movement direction conversion mechanism.

Abstract: Provided is a writing utensil with a pressurizing mechanism, wherein the cylinder is provided in such a manner that it comes into sliding contact with an outer peripheral part of the valve element and move back and forth, and an inner wall face of the cylinder is provided with a ventilating recess communicating with outside air, and an annular non-pressure contact face positioned on the rear side of the ventilating recess, and when the cylinder moves forward, the valve element is brought into pressure contact with the non-pressure contact face to seal the pressurizing chamber, and when the cylinder moves backward, the valve element is moved forward and separated from the non-pressure contact face such that the ventilating recess communicates with the pressurizing chamber.

Abstract: A mechanical pencil unit is provided which includes: a holding tube; a holder which is inserted into a front side opening portion of the holding tube and which protrudes forward from a front end of the holding tube, and moreover which is supported so as to be back and forth movable relative to the holding tube; a pencil lead delivering mechanism which delivers forward a pencil lead x inserted into the holder; and a movement direction conversion mechanism which causes the holder to go forward relative to the holding tube and the pencil lead x by using a force applied in a radial direction from the pencil lead x to the holder, wherein the pencil lead delivering mechanism is provided at a position further toward a rearward side than the holder and the movement direction conversion mechanism.

Abstract: To make it possible to easily change a writing line width. A ballpoint pen chip that brings a front half part side of a transfer ball into contact with an inward annular protrusion on a front end side in a chip body from a backward side of the inward annular protrusion and receives a rear half part side of the transfer ball with a front end part of a receiving member. The receiving member includes, on a front end side thereof, a reduction part gradually reduced in a cross-sectional area forward. A front-most end part of the reduction part is disposed backward from the transfer ball. A portion of the receiving member further on a rear side than the reduction part is unretreatably fixed to the chip body and configured to elastically contract when a pressing force is received from the transfer ball.

Abstract: A writing utensil with a retract piece is provided, with this writing utensil being equipped with a retract piece that is provided on one end side of a shaft tube of a writing utensil body and that goes forward and assumes a projecting state by its own weight when oriented to face downward, and goes backward and assumes a retracting state by its own weight when oriented to face upward, wherein the writing utensil includes: an advancing and retreating member including the retract piece on a front end side thereof and supported to advance/retreat relative to the writing utensil body; and rolling element supported to rotate without advancing/retreating relative to the writing utensil body, and an outer circumferential face of the rolling element contacts a side face of the advancing and retreating member.

Abstract: To make it possible to easily change a writing line width. A ballpoint pen chip that brings a front half part side of a transfer ball into contact with an inward annular protrusion on a front end side in a chip body from a backward side of the inward annular protrusion and receives a rear half part side of the transfer ball with a front end part of a receiving member. The receiving member includes, on a front end side thereof, a reduction part gradually reduced in a cross-sectional area forward. A front-most end part of the reduction part is disposed backward from the transfer ball. A portion of the receiving member further on a rear side than the reduction part is unretreatably fixed to the chip body and configured to elastically contract when a pressing force is received from the transfer ball.

Abstract: A water-based ink composition capable of forming depicted lines with excellent drying property and with little bleed is described. Also, a water-based ballpoint pen using the water-based ink composition is described. The water-based ink composition includes a polyoxyethylene alkyl ether, a water-soluble organic solvent, a colorant and water, wherein the HLB value of the polyoxyethylene alkyl ether is from 14 to 15, and wherein the polyoxyethylene alkyl ether has an alkyl group contains 8 to 10 carbon atoms.

Abstract: A water-based ink composition is described. The water-based ink composition includes a latex containing styrene-butadiene rubber particles, and a coloring agent, the glass transition temperature of the styrene-butadiene rubber particles being 10° C. to 50° C.

Abstract: To protect a writing core, a writing utensil includes: a shaft tube; a holder which is inserted through a front opening of a shaft tube and protrudes forward from a front end of the shaft tube; a writing core which is inserted through the holder while coming into contact with an inner peripheral surface of the holder and is supported by the shaft tube so as to protrude forward from a front end of the holder; and a movement direction conversion mechanism which is provided between the shaft tube and the holder and moves the holder forward relative to the shaft tube and the writing core by a force applied to the holder in the shaft tube outward radial direction.

Abstract: A writing utensil with a retract piece is provided, with this writing utensil being equipped with a retract piece that is provided on one end side of a shaft tube of a writing utensil body and that goes forward and assumes a projecting state by its own weight when oriented to face downward, and goes backward and assumes a retracting state by its own weight when oriented to face upward, wherein the writing utensil includes: an advancing and retreating member including the retract piece on a front end side thereof and supported to advance/retreat relative to the writing utensil body; and rolling element supported to rotate without advancing/retreating relative to the writing utensil body, and an outer circumferential face of the rolling element contacts a side face of the advancing and retreating member.

Abstract: To protect a writing core, a writing utensil includes: a shaft tube; a holder which is inserted through a front opening of a shaft tube and protrudes forward from a front end of the shaft tube; a writing core which is inserted through the holder while coming into contact with an inner peripheral surface of the holder and is supported by the shaft tube so as to protrude forward from a front end of the holder; and a movement direction conversion mechanism which is provided between the shaft tube and the holder and moves the holder forward relative to the shaft tube and the writing core by a force applied to the holder in the shaft tube outward radial direction.

Abstract: A W/O-type emulsion ink composition for a writing tool having an aqueous component dispersed in an oil component, the oil component including a fluorescent coloring agent, and the aqueous component including a fluorescent whitening agent and water.

Abstract: The invention relates to a water-based ink composition comprising a latex containing styrene-butadiene rubber particles, and a coloring agent, the glass transition temperature of the styrene-butadiene rubber particles being 0° C. to 50° C.

Abstract: A W/O-type emulsion ink composition for a writing tool having an aqueous component dispersed in an oil component, the oil component including a fluorescent coloring agent, and the aqueous component including a fluorescent whitening agent and water.