JP6859052B2 - Pressurized writing tool - Google Patents

Description

The present invention relates to a pressure-type writing instrument that applies pressure to the rear end of an ink composition for a writing instrument by a pressurizing mechanism provided on the shaft cylinder in a state where the front end portion of the ballpoint pen tip protrudes from the front end of the shaft cylinder.

Conventionally, a pressurizing mechanism has been provided at the rear end of the ink containing tube, and as disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-335173 “Ballpoint Pen”, the inside of the ink-filled tube is interlocked with the extrusion operation of the knock mechanism. A pressure-type writing tool in which the pressure mechanism is operated by pressing the knock body, such as a structure in which the pressure is applied, or, for example, as disclosed in "Applying Tool" of Jitsukaihei 6-16588, the cap is used as a shaft. There is known a pressure-type writing tool that operates a pressure-pressing mechanism by fitting it to the rear end of the cylinder.

Japanese Unexamined Patent Publication No. 2000-335173 Jikkenhei 6-16588 Japanese Patent No. 5558908

However, in a pressure-type writing instrument such as Patent Document 1, since a pressure is always applied to the rear end of the ink after the pressure mechanism is operated, ink leakage from the tip tip is likely to occur. Become. Therefore, the ink leakage is suppressed by using an ink composition for a writing instrument having a high ink viscosity in advance for the pressure-type writing instrument.

Further, in Patent Document 2, a pressurized state can be obtained by attaching a cap, but in order to maintain the pressurized state even after the cap is removed by the valve mechanism, as in Patent Document 1, it is always in a pressurized state at the time of writing. , The ink viscosity and its composition were performed on the premise that a pressing force was applied to the rear end of the ink composition for writing instruments.

Further, as a technique for solving these problems, Patent Document 3 discloses a pressure-type writing instrument that operates a pressure-pressing mechanism by a writing pressure at the time of handwriting formation.
The pressure-type writing instrument of Patent Document 3 includes a holder that is annularly attached to the rear end side of the refill (hereinafter, refill), and a cylinder that covers the holder from the rear and holds the holder so that it can move forward and backward. When a backward pressing force is applied to the refill during handwriting formation, the refill and holder retract with respect to the cylinder, and the pressurizing chamber inside the cylinder is compressed. Since no pressure is applied to the ink, a technique that can suppress ink leakage during non-writing (no pressure is applied) is disclosed.

However, the pressurizing mechanism of Patent Document 3 has a structure in which a holder is attached so as to cover the rear end side of the refill and the cylinder is further covered from the outside with respect to the holder, and is inserted into the refill. Since no member is required, the dimensional accuracy of the inner diameter of the refill is not required, but the outer diameter of the pressurizing mechanism is thicker due to the structure that double covers the refill, and the outer diameter of the cylinder containing the pressurizing mechanism is There was a problem of getting thicker.

An object of the present invention is to obtain a pressure-type writing instrument that can apply a pressing force to the rear end of an ink composition for a writing instrument only when forming a handwriting, without increasing the outer diameter.

In order to achieve the above object, a ballpoint pen refill having an ink storage cylinder filled with an ink composition for writing instruments and a ballpoint pen tip in the front portion of the ink storage cylinder is housed in a shaft cylinder.
A pressure-type writing instrument that applies pressure to the rear end of an ink composition for a writing instrument by a pressurizing mechanism provided on the barrel with the front end of the ballpoint pen tip protruding from the front end of the barrel.
The ballpoint pen refill is movably arranged on the rear side of the barrel with the front end of the ballpoint pen tip protruding from the front end of the barrel.
The pressurizing mechanism includes a cylinder mounted on the rear end of the ink storage cylinder and capable of communicating at least in the rear end opening of the ink storage cylinder, and an air hole communicating inside and outside the cylinder on the outer peripheral surface of the cylinder. When a person the cylinder piston and rotatably disposed longitudinal to the cylinder rear end opening of the sealing member for closing the air hole of the cylinder, the cylinder between the cylinder and the piston forward It is equipped with the first projectile to repel,
The outer diameter of the cylinder and the outer diameter of the piston are provided to be equal to or smaller than the outer diameter of the ink storage cylinder.
A reduced front end of the cylinder and a front end of the piston are mounted in the rear end opening of the cylinder in the rear end opening of the ink storage cylinder.
By moving the ballpoint pen refill rearward while the front end portion of the ballpoint pen tip protrudes from the tip opening of the shaft cylinder, the piston abuts in the shaft cylinder and movement to the rear is suppressed. In addition, the cylinder moves toward the rear end of the axle cylinder against the elastic force of the first projectile, so that the air hole of the cylinder is closed by the sealing member, and after the ink accommodating cylinder. A sealed pressurized space is formed at the end,
Further, when the cylinder moves toward the rear end of the cylinder, the pressure space is compressed and pressure is applied to the rear end of the ink composition for writing instruments. In the present invention, "front" refers to the ballpoint pen tip side, and "rear" refers to the opposite side. Further, "inner side" refers to the axial direction of the barrel, and "outer side" refers to the opposite direction.

Further, the cylinder and the piston are each composed of a cylinder whose front end is reduced in diameter from the rear end, and the diameter-reduced front end of the cylinder and the cylinder are contained in the rear end opening of the ink containing cylinder. It is characterized in that the front end portion of the piston is mounted in the rear end opening.

The ballpoint pen refill, the cylinder, and the piston are detachably arranged with respect to the shaft cylinder.

Further, the pressure applied to the rear end of the ink composition for writing instruments is higher than 1000 hPa and 1500 hPa or less when the atmospheric pressure is 1000 hPa. The pressure applied to the rear end of the writing instrument ink composition can be measured by measuring the amount of change in the volume of the compressed space before and after pressurization. At this time, the calculation is performed assuming that the temperature is 20 ° C. and the atmospheric pressure is 1000 hPa.

The ballpoint pen refill is repelled to the rear side of the barrel by the second projectile provided in the barrel, and is arranged so as to be movable back and forth, and operates the infestation mechanism provided in the barrel. By doing so, the ballpoint pen tip is a retractable ballpoint pen provided so as to be retractable from the front end of the barrel.

INDUSTRIAL APPLICABILITY According to the present invention, it was possible to obtain a pressure-type writing instrument in which a pressing force can be applied to the rear end of an ink composition for a writing instrument only when forming a handwriting, without increasing the outer diameter.

It is a vertical cross-sectional view which shows the state (non-pressurized state) in which the ballpoint pen tip of the pressure type writing instrument of Example 1 is immersed. FIG. 1 is an enlarged vertical cross-sectional view of a main part omitted in part. It is a vertical cross-sectional view which shows the state (non-pressurized state) that the ballpoint pen tip in FIG. 1 protrudes. FIG. 3 is a vertical cross-sectional view showing a state in which writing pressure is applied (pressurized state) in FIG. FIG. 1 is an explanatory view showing a part of the state when the ballpoint pen refill is replaced in a vertical cross-sectional view.

In the present invention, first, the ballpoint pen refill moves the ballpoint pen refill rearward while the front end of the ballpoint pen tip protrudes from the front end of the barrel, so that the rear end of the piston is inside the barrel. The air hole of the cylinder is closed by the sealing member because the cylinder moves toward the rear end of the barrel against the elastic force of the first projectile, and the rearward movement is suppressed. Further, by moving the cylinder toward the rear end of the barrel, the pressurized space surrounded by the cylinder, the piston, and the sealing member is compressed, and pressure is applied to the rear end of the ink composition for writing tools. In the non-writing state (no pressure is applied), the pressure is not applied (no pressure is applied to the rear end of the ink composition for writing tools), so ink leakage from the tip of the tip is reliably prevented. can do. Further, since the writing pressure is applied, the pressure is reset for each stroke, so that the pressing force at the time of writing is stable and the density change is unlikely to occur.

Further, the diameter-reduced front end portion of the cylinder and the front end portion of the piston are mounted in the rear end opening of the cylinder in the rear end opening of the ink storage cylinder, and the outer diameter of the ink storage cylinder is increased. By providing the maximum outer diameter of the cylinder and the maximum outer diameter of the piston to be the same diameter or less, the cylinder of the pressurizing mechanism is compared with the case where the pressurizing mechanism is formed so as to cover the outside of the ink containing cylinder. Since it is not necessary to increase the outer diameter of the cylinder, it is possible to provide a pressurized writing tool without increasing the outer diameter of the cylinder as a result. The outer diameter of the barrel is preferably 12 mm or less, more preferably 10 mm or less so that it can be easily gripped during writing.
Further, since the outer diameter of the ink containing cylinder, the maximum outer diameter of the cylinder, and the maximum outer diameter of the piston are made equal to or less than the same diameter, the piston and the cylinder are removed at the same time as the ballpoint pen refill, and the total length is obtained. It can accommodate other long ballpoint pen refills and can be used as a normal (non-pressurized) writing instrument.

Next, the cylinder and the piston each consist of a cylinder whose front end is reduced in diameter from the rear end, and the diameter-reduced front end of the cylinder is inside the rear end opening of the ink containing cylinder. By mounting the front end of the piston in the rear end opening of the cylinder, it is easy to mount because the mounting directions of the cylinder and the piston match, and the outer diameter of the ink storage cylinder can be stored in the shaft cylinder. If there is, it can be formed thick without being affected by the outer diameter of the cylinder, so that the capacity of the ink storage cylinder can be increased.

Next, the pressure applied to the rear end of the ink composition for writing instruments is higher than 1000 hPa and 1500 hPa or less when the atmospheric pressure is 1000 hPa, so that stable ink consumption can be easily obtained and the pressure is applied. Ink leakage from the front end of the chip in the state can be suppressed, which is preferable. Further, the pressure applied to the rear end of the ink composition for writing instruments is more preferably 1200 hPa or less because the effect of suppressing ink leakage is further enhanced.

Next, the ballpoint pen refill is arranged so as to be repulsively repelled and moved back and forth with respect to the barrel by the second projectile provided in the barrel, and the ballpoint pen refill is arranged in the barrel. By providing a retracting mechanism for retracting the ballpoint pen tip of the ballpoint pen refill from the front end of the barrel, it is possible to easily switch between the standby state (pen tip immersion) and the writing state (pen tip protrusion). Further, even if the ink composition is left in the writing state, it is in a non-pressurized state (no pressure is applied to the rear end of the ink composition for writing instruments), so that ink leakage from the tip of the chip does not occur.

The ink composition for writing instruments used in the present invention is not particularly limited to oil-based inks, water-based inks, shear-reducing inks, etc., but when the writing tip is separated from the paper surface even in the writing state (brush). Since it is not pressurized (when no pressure is applied), it can be suitably used for inks with relatively low viscosity, and it is possible to increase the amount of ink outflow and improve the writing density due to pressurization. It is preferably used for heat-discoloring inks containing capsule pigments and writing instruments for writing on non-penetrating surfaces.

Further, when writing on a non-penetrating surface, the writing surface is often extremely smooth, and it is difficult to generate a driving force toward the rotation of the ball at the end of the writing surface. Therefore, due to the pressing force, ink with good lubricity is filled around the ball receiving seat to reduce the rotational resistance, and further, the viscous ink is transferred onto the smooth writing surface to form a rotating environment. Because it can be done.

Further, by setting the ink consumption value per unit area of the ballpoint pen refill to 0.7 to 1.5 mg / cm ² , it is easy to obtain the above-mentioned handwriting density. Further, the ink consumption value is preferably 0.7 to 1.2 mg / cm ² . In order to obtain a good handwriting, it is important that the handwriting width is smaller than the ball diameter, and the handwriting width under pressure is preferably 65% to 95% of the ball diameter, which is more preferable. Is 70% to 90%.

The handwriting width is the handwriting obtained by the above writing according to ISO13660, and the handwriting width (mm) is the average value of the region of 60% or less of the reflectance. It can be obtained by a personal image quality evaluation device (PIAS-II manufactured by QEA (Quality Engineering Associates)). In the present invention, 15 points were measured and the average value was used for the measurement.

Further, as a ball pen tip, a tip formed by holding a ball in a ball holding portion obtained by pressing and deforming the vicinity of the tip of a metal pipe inward from an outer surface, or a metal material formed by cutting with a drill or the like. A tip that holds the ball in the ball holding part, or a ball that holds the ball in the tip formed by cutting a metal pipe or metal material and urged forward by a coil spring, etc. is applied. it can.

Further, as the ball, a general-purpose ball made of cemented carbide, stainless steel, ruby, ceramic or the like can be applied, and a ball having a diameter of 0.1 mm to 2.0 mm, preferably 0.2 mm to 1.2 mm is preferable. Used for. In particular, when the ball diameter is as small as 0.5 mm or less, the number of rotations of the ball with respect to the writing distance is large and it becomes difficult to write on the non-penetrating surface. Therefore, the present invention works more preferably, so that the ball diameter is 0. It is most effective when used for ballpoint pen refills of .5 mm or less.

The shape of the ballpoint pen tip is not particularly limited, but the tip body has an ink flow hole formed in the center of the bottom wall of the ball holding chamber and a plurality of ink flow grooves radially extending from the ink flow hole. A ball seat having a substantially arcuate surface is provided on the bottom wall of the ball holding chamber, and a ball having a diameter of 0.5 mm or less is placed on the ball seat, and a part of the ball is placed on the tip edge of the tip. It is more projected and rotatably held, and a substantially arc-shaped sealing surface is formed on the inner wall of the front end of the chip, and the vertical clearance of the ball is 15 to 40 μm, which stabilizes the ball. It is preferable because it can suppress the wear of the brush stroke and the ball seat.

It is considered that this is because the contact area between the ball and the chip body is increased by providing the ball seat having a substantially arcuate surface shape on the bottom wall of the ball holding chamber, so that the wear of the seat is suppressed. However, by forming the ball seat, the space (volume) of the ball holding chamber excluding the balls is reduced, so that the ink consumption tends to decrease. However, in the pressure-type thermochromic writing instrument of the present invention, the ink consumption tends to decrease. It is possible to eject a large amount of ink by applying pressure. In particular, in a ballpoint pen on which a ball having a diameter of 0.5 mm or less is placed on the ball seat, the effect of the present invention is remarkable because the wear of the ball seat is remarkable, and the vertical clearance of the ball is 15 to 40 μm. By setting the thickness to 20 to 30 μm, stable handwriting and ink leakage from the tip tip can be suppressed.

As the ink storage cylinder for accommodating the ink composition for writing utensils, for example, a molded product made of a thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate, or a metal material is used, and in terms of low ink evaporability and productivity. Polypropylene is preferably used. Further, in order to maintain the pressurized state, a gas barrier material such as EVOH can be appropriately used such as being laminated on a single layer, a multilayer, or another material.

Further, an ink follower (liquid plug) can be arranged at the rear end of the ink composition for writing instruments. As the ink follower, either liquid or solid can be used, and examples of the liquid ink follower include non-volatile media such as polybutene, α-olefin oligomer, silicone oil, and refined mineral oil, if desired. Silica, aluminum silicate, swellable mica, fatty acid amide and the like can also be added to the medium. Further, as a solid ink follower, a resin molded product can be mentioned. The liquid and solid ink followers can also be used together.

By using a transparent, colored transparent, or semi-transparent molded product as the shaft cylinder, the ink color, the remaining amount of ink, and the like can be confirmed.

Further, the water-based ink composition for writing instruments may contain either a dye or a pigment, but preferably contains a pigment. Examples of pigments include inorganic, organic, and processed pigments. Specific examples include carbon black, aniline black, ultramarine, yellow lead, titanium oxide, iron oxide, phthalocyanine, azo, quinacridone, quinophthalone, and slene. Examples thereof include system, triphenylmethane type, perinone type, perylene type, gyoxazine type, aluminum pigment, pearl pigment, reversible thermochromic pigment, fluorescent pigment, phosphorescent pigment, thermochromic pigment, complementary color pigment and the like. These pigments may be used alone or in combination of two or more. The content is preferably 0.1 to 20.0% by mass with respect to the total amount of the ink composition.

Further, if necessary, a conventional general-purpose water-soluble organic solvent compatible with water can be used. Specifically, ethanol, propanol, butanol, glycerin, sorbitol, triethanolamine, diethanolamine, monoethanolamine, ethylene glycol, diethylene glycol, thiodiethylene glycol, polyethylene glycol, propylene glycol, butylene glycol, ethylene glycol monomethyl ether, ethylene glycol mono. Examples thereof include ethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, ethylene glycol monomethyl ether acetate, sulfolane, 2-pyrrolidone, N-methyl-2-pyrrolidone and the like.
The water-soluble organic solvent may be used alone or in combination of two or more, and is used in the range of 2 to 60% by weight, preferably 5 to 35% by weight.

Further, it is preferable to add a water-soluble resin or a resin emulsion in order to impart fixability and viscosity to the paper surface and improve handwriting fixability on the non-penetrating surface. Examples of the water-soluble resin include alkyd resin, acrylic resin, styrene maleic acid copolymer, cellulose derivative, polyvinylpyrrolidone, polyvinyl alcohol, dextrin and the like. Examples of the resin emulsion include acrylic resin, urethane resin, styrene-butadiene resin, polyester resin, vinyl acetate resin and the like. The water-soluble resin or resin emulsion may be used alone or in combination of two or more, and is used in the range of 1 to 30% by weight in the ink composition.

In addition, if necessary, inorganic salts such as sodium carbonate, sodium phosphate, sodium acetate, pH adjusters such as organic basic compounds such as water-soluble amine compounds, benzotriazole, tolyltriazole, 2,5-dimercapto- Antiseptic agents such as 1,3,4-thiasiazole, saponin, coal acid, sodium salt of 1,2-benzthiazolin 3-one, sodium benzoate, sodium dehydroacetate, potassium sorbate, propyl paraoxybenzoate, 2,3 , 5,6-Tetrachloro-4- (methylsulfonyl) pyridine and other preservatives or antifungal agents, urea, nonionic surfactants, sorbit, mannit, sucrose, glucose, reduced starch hydrolyzate, pyrophosphate Wetting agents such as sodium, antifoaming agents, and nonionic surfactants may be used.

In addition, ascorbic acids, erythorbic acids, α-tocopherols, catechins, synthetic polyphenols, kodiic acid, alkylhydroxylamines, oxime derivatives, α-glucosylrutin, α-lipoic acid, phosphonates, phosphinates, sulfates, sulfoxyls. Bubbles can also be chemically removed by adding acid salt, phosphite, thiosulfate, thiourea dioxide and the like.

In addition, N-vinyl-2-pyrrolidone oligomer, N-vinyl-2-piperidone oligomer, N-vinyl-2-pyrrolidone, N-cyclohexyl-2-pyrrolidone, ε-caprolactam, N-vinyl-ε-caprolactam By adding a thickening inhibitor such as an oligomer, it is possible to enhance the function in a form in which the pen tip is always exposed, such as in a haunting type.

Further, lubricants can be used, for example, metal soaps, polyalkylene glycol fatty acid esters, ethylene oxide-added cationic activators, phosphate ester-based surfactants, β-alanine surfactants, N-acylamino acids, etc. N-acylmethyltaurine, 2,5-dimercapto-1,3,4-thiazazole and its salts and oligomers, 3-amino-5-mercapto-1,2,4-triazole, thiocarbamate, dimethyldithiocarbamate , Α-Lipoic acid, condensate of N-acyl-L-glutamic acid and L-lysine, salts thereof and the like are used.

Example 1
In the pressurized writing tool 1 shown in FIGS. 1 to 4, a shaft cylinder 4 is formed by a front shaft 2 and a rear shaft 3, a male screw portion 2a is provided on the rear outer surface of the front shaft 2, and a front end portion of the rear shaft 3 is provided. It is detachably screwed to the female screw portion 3a provided on the inner surface. Further, the pressurized writing tool 1 is housed so as to be retractable by an opaque grip 5 formed so as to surround the outer surface of the front shaft 2 in the circumferential direction and a rotary cam mechanism 6 (appearance mechanism) provided in the shaft cylinder 4. The ballpoint pen refill 7 is provided, and the rear end inner peripheral portion 7a of the ballpoint pen refill 7 is detachably press-fitted and attached to the front end outer peripheral portion 8a (front end portion) of the cylinder 8 arranged in the shaft cylinder 4. ..

Further, the grip 5 is made of a styrene-based elastomer and is integrally provided with the front shaft 2 by two-color molding.

The ballpoint pen refill 7 follows the ink composition 10 for writing tools obtained in the ink formulation A1 described later and the rear end of the ink composition 10 for writing tools in a transparent ink storage cylinder 9 made of PP resin as the ink is consumed. The grease-like ink follower 11 is directly accommodated, and the rear end portion of the ballpoint pen tip 12 rotatably holding a ball (φ0.38 mm) is press-fitted into the front end opening of the ink accommodating cylinder 9. It is an ink.

The front shaft 2 is formed with a front end opening 2b at the front end on which the ballpoint pen tip 12 of the ballpoint pen refill 7 can protrude. Further, a coil spring 13 (second projectile) is stretched between the front stage portion 7b of the ballpoint pen refill 7 and the inner stage 2c of the front shaft 2, and the ballpoint pen refill 7 is axially rearward with respect to the front shaft 2. It has been repelled.

The rotary cam mechanism 6 (striking mechanism) described above includes a rotating cam 14 for switching the appearance of the ballpoint pen tip 12 of the ballpoint pen refill 7 in the rear shaft 3 and a cam groove 3b (FIG. 2) that engages with the rotary cam 14. (See) and are provided. When the knock member 15 is pressed (knocked) while the ballpoint pen tip 12 of the ballpoint pen refill 7 is immersed in the front shaft 2 (see FIG. 1), the rotating cam 14 slides along the cam groove 3b. The ballpoint pen tip 12 of the ballpoint pen refill 7 protrudes forward from the front end opening 2b of the front shaft 2, and the rotary cam 14 is rotated by the action of the rotary cam mechanism 6, so that the rotary cam 14 is inside the rear cylinder 3. The ballpoint pen refill 7 is maintained in a protruding state even after the pressing operation is completed by abutting on the step and prohibiting relative movement in the rearward direction in the axial direction. (State in Fig. 3)
Further, when the knock member 15 is pressed (knocked) again in the protruding state of FIG. 3, the rotary cam mechanism 6 allows the rotary cam 14 to move backward in the axial direction, and the ball of the coil spring 13 is repelled. The ballpoint pen refill 7 and the knock member 15 are pushed back in the axial direction by the force of force to return to the initial state (the state shown in FIG. 1).

A piston 16 is arranged in front of the rotary cam 14. In the piston 16, the flange portion 16b provided at the rear end portion 16a is in contact with the front end 14a of the rotary cam 14, and the front portion 16d (front end portion) is slidably inserted into the rear end opening 8b of the cylinder 8. There is. The front portion 16d (front end portion) of the piston 16 is formed to have a smaller diameter than the flange portion 16b of the rear end portion 16a.

More specifically about the piston 16, the piston 16 is a cylinder having an inner hole, and two protrusions 16c projecting outward are symmetrically formed on the side surface of the piston 16 so as to sandwich the axial center. The protrusion 16c is slidably hooked to the window portion 8c formed so as to extend along the axial center formed on the rear outer peripheral portion 8e of the cylinder.
Further, a groove-shaped groove portion 16e is formed on the side surface of the front portion 16d of the piston 16 in the axial direction, and an O-ring 17 (sealing member) formed of synthetic rubber is fitted in the groove portion 16e. The outer portion of the O-ring 17 is in sliding contact with the inner peripheral surface of the cylinder 8, and the rear end opening 8b of the cylinder 8 is sealed by the piston 16 and the O-ring 17 so that air does not leak.

A pressurizing coil spring 18 (first projectile) is stretched between the inner stage 8d of the cylinder 8 and the front stage portion 16f of the piston 16 to repel the cylinder 8 forward with respect to the piston 16. is there.
The elastic force of the pressurizing coil spring 18 (first projectile) is set to be larger than the elastic force of the coil spring 13 (second projectile), and the cylinder 8 moves backward when not writing. The pressure space 8e is prevented from being pressurized by preventing the movement.
Further, the pressurizing mechanism 19 is composed of the cylinder 8, the piston 16, the O-ring 17, and the pressurizing coil spring 18.

More specifically about the cylinder 8, the cylinder 8 is a cylinder having an inner hole formed therein, and an air hole 8 g penetrating to the inner hole is formed on the outer peripheral surface of the cylinder 8. A pressurized space 8h surrounded by the inner hole 8f of the cylinder 8, the front end of the piston 16 and the O-ring 17 is formed in the inner hole of the cylinder 8, and the pressurized space 8h is formed by the air hole 8g of the cylinder 8. Ventilated with the outside.
Further, the front outer peripheral portion 8a of the cylinder 8 is formed to have a smaller diameter than the rear outer peripheral portion 8e, and the front end outer peripheral portion 8a is formed with two mounting portions 8i protruding outward in a circumferential shape. Further, as described above, since the rear end inner peripheral portion 7a of the ballpoint pen refill 7 is detachably press-fitted to the mounting portion 8i of the front end outer peripheral portion 8a of the cylinder 8, the pressurizing space 8h is formed by the inner hole of the cylinder 8. It communicates to the rear inner hole of the ballpoint pen refill 7.
Therefore, the pressurized space 8h of the cylinder 8 is sealed when the position of the O-ring 17 is in front of the air hole 8g of the inner portion 8f of the cylinder 8 due to the sliding of the cylinder 8 back and forth. When the position of is behind the air hole 8g, the pressurized space 8h and the outside of the cylinder are ventilated by the air hole 8g to be in an unsealed state.

The outer diameter (maximum diameter) of the rear outer peripheral portion 8b of the cylinder 8 and the outer diameter (maximum diameter) of the flange portion 16b of the piston 16 are substantially the same as the outer diameter (maximum diameter) of the ink storage cylinder 9 of the ballpoint pen refill 7. It is formed.

Next, the writing operation of the pressurized writing instrument 1 of this embodiment will be described with reference to FIGS. 3 and 4.
As shown in FIG. 3, when the writing pressure is applied from the position where the front end portion of the ballpoint pen tip 12 protrudes from the front end opening 2b of the barrel 4 during writing, the ballpoint pen tip 12 comes into contact with the rotary cam 14 and the rotary cam 14 as described above. Since the piston 16 cannot move backward, the ballpoint pen refill 7 and the cylinder 8 move backward (in the direction of arrow G) in conjunction with the elastic force of the pressurizing coil spring 18. Specifically, first, when the pressurizing coil spring 18 is compressed and the cylinder 8 moves rearward, the air hole 8g of the cylinder 8 moves rearward from the position of the O-ring 17 (sealing member), and the inside of the cylinder 8 The O-ring 17 is pressed against the peripheral surface to seal the pressurized space 8h. Further, when the cylinder 8 moves rearward, the pressurizing coil spring 18 is further compressed to further compress the rear end portion of the ink storage cylinder 9 and the pressurizing space 8h, and the rear end of the writing ink composition 10 of the ballpoint pen refill 7. The state shown in FIG. 4 is such that pressure can be applied to the rear end of the ink follower 11 arranged in.

When the writing pressure is released (during non-writing), the cylinder 8 and the ballpoint pen refill 7 move forward (original position) due to the elastic force of the pressurizing coil spring 18. At that time, when the position of the air hole 8g of the cylinder 8 reaches the O-ring 18, the air hole 8g is opened to release the sealing of the pressurized space 8h and the rear end of the ink storage cylinder 9, which is the same as the atmospheric pressure. It becomes pressure and returns to the state shown in FIG. In this example, at the time of writing, the maximum pressure applied to the rear end of the writing instrument ink composition 10 via the ink follower 11 was 1050 hPa.

Next, the operation of exchanging the ballpoint pen refill 7 in the pressurized writing tool 1 of this embodiment will be described with reference to FIGS. 1 and 5.
From the state of FIG. 1, by grasping the front shaft 2 and the rear shaft 3 and applying rotation to the opposite side where the front shaft 2 and the rear shaft 3 are screwed, the male screw portion 2a and the female screw portion 3a are screw-fitted. When the rear shaft 3 is pulled backward with respect to the front shaft 2 in that state, the outer diameter of the ball pen refill 7 and the outer diameters of the cylinder 8 and the piston 16 are formed to be substantially the same, so that the rear shaft 3 Can be pulled out without resistance, and the ball pen refill 7 and the pressurizing mechanism 19 project rearward from the rear end of the front shaft 2 in the state shown in FIG. In this state, the ballpoint pen refill 7 and the pressurizing mechanism 19 can be replaced by pulling the ballpoint pen refill 7 rearward from the front shaft 2.
When replacing only the ballpoint pen refill 7, the pressurizing mechanism 19 and the ballpoint pen refill 7 are removed by pulling the pressurizing mechanism 19 backward with respect to the ballpoint pen refill 7, and a replacement ballpoint pen refill is added. After attaching to the pressure mechanism 19, it may be returned to the inside of the barrel 4. Further, although not shown, the ballpoint pen refill to be replaced can be selected from another ballpoint pen refill having a long overall length without the pressurizing mechanism 19. In that case, the pressurizing writing tool 1 is used as a normal (non-pressurizing) writing tool. It is also possible to do.

The ink compound A1 uses Pigment Black 7, which is a pigment as a coloring material, water as a solvent, and an acrylic resin (trade name: HPD-96, manufactured by Johnson Polymer Co., Ltd.) as a water-soluble resin having both a pigment dispersion function and a brush stroke fixing performance. Each component was accurately weighed in a predetermined amount, and a pigment dispersion in which the pigment was uniformly dispersed by a ball mill was obtained. Next, triethanolamine, which is a pH adjuster, Prysurf A-208S (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), which is a phosphoric acid ester surfactant as a rust preventive lubricant, and allyl emulsion as a brush fixability improver. Brand name John Krill 7001 (manufactured by Johnson Polymer Co., Ltd.), water-soluble modified silicone oil as a wettability improver on non-penetrating surfaces KF-618 (manufactured by Shinetsu Chemical Industry Co., Ltd.), as an antibacterial agent A predetermined amount of 1,2-benzoisothiazolin-3-one was accurately weighed, heated and stirred with a disper stirrer at a stirring temperature of 50 ° C. for 1 hour, and then gradually cooled until the liquid temperature reached 30 ° C. Further, while stirring the uniform mixed liquid with a disper, a predetermined amount of isopropyl alcohol having a vapor pressure of 4.3 kPa at 20 ° C. is gradually added and stirred at a temperature of 30 ° C. for 20 minutes, so that both the handwriting and the appearance are black. Ink for water-based ballpoint pens was obtained. The product names HPD-96 and John Krill 7001 were designed with ink in consideration of the effective solid content of each. The ink viscosity at 20 ° C. was 5 mPa · s.

The ink viscosity was measured by using a B8M type viscometer manufactured by Tokimec, in which the viscosity of the BL rotor at a rotation speed of 12 rpm was measured in an environment of 20 ° C.

In the present embodiment, for convenience, a mechanism for causing the front end of the chip to appear and disappear from the opening of the front end of the axle cylinder by knocking the rear end is illustrated, but the knock type, slide type, rotation, and the like are not particularly limited. Further, at least one ballpoint pen refill may be accommodated in the barrel, and for example, a plurality of ballpoint pen refills may be accommodated in the barrel.

The pressure-type writing instrument of the present invention can be widely used as a pressure-type writing instrument such as ink color, single type, and compound type, and can be particularly preferably used for black heat-discoloring ink.

1 ... Pressurized writing tool,
2 ... Front shaft, 2a ... Male screw part, 2b ... Front end opening, 2c ... Inner stage,
3 ... Rear shaft, 3a ... Female screw part, 3b ... Cam groove,
4 ... Axle,
5 ... Grip,
6 ... Rotating cam mechanism,
7 ... Ballpoint pen refill, 7a ... Rear end inner circumference, 7b ... Front stage,
8 ... Cylinder, 8a ... Front end outer circumference, 8b ... Rear end opening, 8c ... Window, 8d ... Inner stage,
8e ... Rear outer peripheral part, 8f ... Inner part, 8g ... Air hole, 8h ... Pressurized space, 8i ... Mounting part,
9 ... Ink storage cylinder,
10 ... Ink composition for writing instruments,
11 ... Ink follower,
12 ... Ballpoint pen tip,
13 ... Coil spring,
14 ... Rotating cam, 14a ... Front end,
15 ... Knock member,
16 ... piston, 16a ... rear end, 16b ... collar, 16c ... protrusion, 16d ... front,
16e ... groove, 16f ... front stage,
17 ... O-ring,
18 ... Coil spring for pressurization,
19 ... Pressurization mechanism,
A1 ... Ink combination.

Claims (5)

A ballpoint pen refill having an ink storage cylinder filled with an ink composition for writing instruments and a ballpoint pen tip at the front portion of the ink storage cylinder is housed in the shaft cylinder.
A pressure-type writing instrument that applies pressure to the rear end of an ink composition for a writing instrument by a pressurizing mechanism provided on the barrel with the front end of the ballpoint pen tip protruding from the front end of the barrel.
The ballpoint pen refill is movably arranged on the rear side of the barrel with the front end of the ballpoint pen tip protruding from the front end of the barrel.
The pressurizing mechanism includes a cylinder mounted on the rear end of the ink storage cylinder and capable of communicating at least in the rear end opening of the ink storage cylinder, and an air hole communicating inside and outside the cylinder on the outer peripheral surface of the cylinder. When a person the cylinder piston and rotatably disposed longitudinal to the cylinder rear end opening of the sealing member for closing the air hole of the cylinder, the cylinder between the cylinder and the piston forward It is equipped with the first projectile to repel,
The outer diameter of the cylinder and the outer diameter of the piston are provided to be equal to or smaller than the outer diameter of the ink storage cylinder.
The reduced front end of the cylinder and the front end of the piston are mounted in the rear end opening of the cylinder in the rear end opening of the ink storage cylinder.
By moving the ballpoint pen refill rearward while the front end portion of the ballpoint pen tip protrudes from the tip opening of the shaft cylinder, the piston abuts in the shaft cylinder and movement to the rear is suppressed. In addition, the cylinder moves toward the rear end of the axle cylinder against the elastic force of the first projectile, so that the air hole of the cylinder is closed by the sealing member, and after the ink accommodating cylinder. A sealed pressurized space is formed at the end,
Further, a pressure-type writing instrument, characterized in that the pressure space is compressed by moving the cylinder toward the rear end of the cylinder, and pressure is applied to the rear end of the ink composition for a writing instrument. The cylinder and the piston are each composed of a cylinder whose front end is reduced in diameter from the rear end, and the diameter-reduced front end of the cylinder and the rear of the cylinder are contained in the rear end opening of the ink containing cylinder. The pressure-type writing tool according to claim 1, wherein the front end portion of the piston is mounted in the end opening. The pressurized writing tool according to claim 1 or 2, wherein the ballpoint pen refill, a cylinder, and a piston are detachably arranged with respect to the shaft cylinder. The pressure type according to any one of claims 1 to 3, wherein the pressure applied to the rear end of the ink composition for writing instruments is higher than 1000 hPa and 1500 hPa or less when the atmospheric pressure is 1000 hPa. Writing utensils. The ballpoint pen refill is arranged behind the barrel so as to be urged and can move back and forth by a second projectile provided in the barrel, and operates the infestation mechanism provided in the barrel. The pressurized writing tool according to any one of claims 1 to 4, wherein the ballpoint pen tip is a retractable ballpoint pen that can be retracted from the front end of the barrel.

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