JP6754286B2 - Pressurized writing instrument - 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 with the front end portion of the writing instrument protruding from the front end of the barrel.

Conventionally, a pressurizing mechanism has been provided at the rear end of the refill, which is an ink containing tube. For example, as disclosed in Japanese Patent No. 5558908 "Pressurized Writing Instrument", a downward pressing force is applied to the refill by writing or the like. A pressure-type writing instrument having a structure in which a refill and a holder retract with respect to a cylinder and a pressure chamber compresses when added is known.

Japanese Patent No. 5558908

However, in the structure of Patent Document 1, the closer the pressure-type writing instrument is to the writing surface, the easier it is for the refill to recede during writing, the pressure chamber is normally compressed, and the ink in the refill is added accordingly. Although pressure is applied, when writing with the barrel tilted with respect to the writing surface, the larger the tilt angle, the less the force component applied in the axial direction of the refill, and the refill is prevented from retreating, which prevents the refill from retreating. There was a problem that the pressure was not applied.
Further, in the structure of Patent Document 1, since the pressurizing chamber is compressed by retracting the refill due to the writing pressure, the refill may sink backward at the time of writing, which may cause a sense of discomfort to the user. ..

The present invention has been invented to solve such a problem. In a pressure-type writing instrument that pressurizes a pressurizing chamber by writing pressure, a shaft that hangs on the writing core even when the writing instrument is tilted with respect to the axis of writing. By converting the force component in the direction orthogonal to the center into the force component in the axial direction, the pressurizing chamber is efficiently and smoothly pressurized, and the discomfort caused by the refill retreating during writing is alleviated. It is an object of the present invention to provide a pressure type writing instrument.

The present invention is
"1. 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.
By retracting the ballpoint pen tip in a state where the front end portion of the ballpoint pen tip protrudes from the tip opening of the barrel, a pressure mechanism provided in the barrel presses the rear end of the ink composition for writing instruments. It is a pressure-type writing instrument that adds
The ballpoint pen refill has a rear region supported in the barrel so that the front region can be flexed and deformed or tilted in the barrel.
Compression between a tubular body arranged so as to cover the ballpoint pen refill in the barrel, a step portion formed on the outer surface of the tubular body, and an inner step formed on the inner surface of the barrel. A first elastic member arranged in a state and a rear tubular body connected to the rear portion of the tubular body and incorporating the pressurizing mechanism are provided.
The tubular body has a pressed portion on the outer peripheral surface, and the tubular body has a pressed portion.
The barrel has a pressing portion on the inner peripheral surface, and has a pressing portion.
At least one of the pressed portion and the pressed portion is a tapered surface whose diameter gradually increases toward the front in the axial direction.
When the front region of the ballpoint pen refill is bent, deformed, or tilted, the pressed portion moves the pressed portion axially forward with respect to the barrel to pressurize the rear tubular body and the pressurizing portion. A pressure-type writing instrument characterized in that the pressure mechanism is in contact with the mechanism to operate the pressure mechanism and pressure is applied to the rear end of the ink composition for a writing instrument.
2. The pressurizing mechanism includes a cylinder having an air hole for communicating inside and outside behind the ballpoint pen refill, a piston arranged behind the cylinder so as to be movable back and forth with respect to the cylinder, and the ballpoint pen refill inside the cylinder. A pressure chamber that communicates between the rear inner hole and the piston is provided.
The diameter-reduced front part of the cylinder is attached to the rear inner hole of the ballpoint pen refill, and the front part of the piston is attached to the rear end opening of the cylinder.
The pressure-type writing instrument according to item 1, wherein the pressure chamber is pressurized by the piston moving forward relative to the cylinder.
3. The cylinder is attached to the piston by a second elastic member arranged in a compressed state between the inner step portion formed on the inner peripheral surface of the cylinder and the front step portion formed on the outer peripheral surface of the piston. The pressure-type writing instrument according to item 2, wherein the ballpoint pen refill is pressed forward by the cylinder by bouncing forward.
4. The tubular body is formed by a third elastic member arranged in a compressed state between the front stage portion formed on the outer peripheral surface of the ballpoint pen refill and the front stage portion formed on the inner peripheral surface of the tubular body. 3) The ballpoint pen refill is repelled backward, and at least when not in use, the elastic force of the second elastic member is larger than the elastic force of the third elastic member. Pressurized writing instrument as described in the section.
5. 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, according to any one of the above items 1 to 4. Pressure writing instrument. ".
In the present invention, the "front" refers to the ballpoint pen tip side of the ballpoint pen refill, and the "rear" refers to the opposite side. Further, the "inner side" refers to the axial direction of the barrel, and the "outer side" refers to the opposite direction.

According to the present invention, when a writing pressure is applied obliquely to a ballpoint pen refill, the ballpoint pen refill recedes due to an axial component of the writing pressure, so that a pressurizing mechanism is activated to operate an ink composition for writing instruments. Pressure is applied to the rear end. Further, when the front region of the ballpoint pen refill is bent, deformed, or tilted in the barrel due to the component perpendicular to the axial direction of the writing pressure, the pressing portion on the inner surface of the barrel presses the pressed portion of the tubular body. By moving the rear tubular body relative to the axial forward with respect to the cylinder, the pressure mechanism is activated and pressure is applied to the rear end of the ink composition for writing instruments. Is added.
Therefore, even when the writing pressure is applied diagonally to the ballpoint pen refill, it is possible to efficiently use both the axial component of the writing pressure and the component perpendicular to the axial direction for the writing instrument in the ballpoint pen refill. The rear end of the ink composition is in a pressurized state, and the amount of outflow of the ink composition for writing instruments increases during writing, which improves the handwriting density, prevents blurring during writing, and writes with the tip of the ballpoint pen tip facing up. Even so, it has the effect of preventing the entrainment of air.
Further, when the writing pressure is applied diagonally to the ballpoint pen refill, the ballpoint pen refill retreats only by the axial component of the writing pressure, and the longer the writing angle is tilted, the shorter the length of the ballpoint pen refill retreating during writing. As a result, the discomfort caused by the ballpoint pen refill retreating during writing is reduced, and the writing feeling is improved.

Further, if the tapered surface provided on at least one of the pressing portion of the barrel and the pressed portion of the tubular body is formed so as to gradually increase in diameter toward the front in the axial direction, it may be formed as a flat surface. It may be formed in a curved surface or in a stepped shape. Further, it is preferable that the pressing portion of the barrel and the pressed portion of the tubular body are formed of a hard resin or metal material so as not to be deformed when they come into contact with each other.
It is preferable that the pressing portion of the barrel and the pressed portion of the tubular body are formed so that the surface roughness of the contact portion between them is low so that they are slippery when writing pressure is applied. Lubricant may be applied to.

Further, the material constituting the pressing portion of the shaft cylinder and the pressed portion of the tubular body can be selected from PP, polycarbonate, acrylic, polyacetal, ABS, PC and the like as long as it is a resin, and the lubricity is further improved. The material may contain a lubricating component.
Further, when the pressing portion of the shaft cylinder and the pressed portion of the tip member are made of metal, brass or aluminum can be preferably used from the viewpoint of machinability, and the surface has lubricity in order to improve lubricity and durability. Surface treatment may be applied. The lubricity surface treatment can be selected from, for example, electroless nickel plating, tin-cobalt plating and other plating treatments, and alumite and other surface treatments.

The surface roughness (average surface roughness Ra) of both surface portions where the pressed portion of the barrel and the pressed portion of the tubular body are in contact with each other moves smoothly while the pressed portion is in contact with the pressed portion. The thickness is preferably 6.3 μm or less, more preferably 1.6 μm or less.
Further, as the lubricant, for example, silicon, grease, molybdenum disulfide, tungsten disulfide, graphite, talc and the like can be preferably used.

Further, by arranging the first elastic member between the tubular body and the barrel and repelling the tubular body backward, at least one of the pressing portion of the barrel and the pressed portion of the tubular body. Since the part is always in contact with the ballpoint pen, the pen tip is prevented from rattling when writing pressure is applied to the ballpoint pen refill, and the pressed part of the tubular body is pressed against the pressing part of the shaft cylinder almost at the same time as the writing operation. By moving relative to the front, the pressurizing mechanism operates and the rear end of the ink composition for writing instruments is pressurized, so that writing with a dark handwriting is possible from the start of writing.
The first elastic member was attached to at least a tubular body, a rear tubular body connected to the tubular body, a pressurizing mechanism built in the rear tubular body, and the pressurizing mechanism. Since the ballpoint pen refill and the ballpoint pen refill are repelled backward, it is preferable to set the load at the time of attaching the first repulsive member higher than the total of the own weights of each part, and also when writing, the pressing part of the barrel It is preferable to set the elastic force of the first elastic member as small as possible so that the pressed portion of the tubular body can slide immediately when it comes into contact with the pressed portion of the tubular body.

Further, the rear tubular body may be formed so that a part of the rear tubular body protrudes outward from the shaft cylinder. In that case, the rear tubular body is moved forward directly by attaching a cap or a finger or the like. By configuring it so that writing can be performed while it is pressed, it can also be used as a pressure-type writing instrument in which the pressure mechanism is constantly operated.

The shape of the pressurizing mechanism is particularly large when the ballpoint pen refill moves backward and the rear tubular body moves forward to operate the pressurizing mechanism to pressurize the inside of the ballpoint pen refill. There is no limitation.
The pressurizing mechanism includes, for example, a cylinder, a piston mounted so as to be movable back and forth with respect to the cylinder, and a pressurizing chamber in the cylinder, the cylinder is mounted at the rear of the ball pen refill, and the piston is further mounted from the rear of the cylinder. A pressure chamber may be formed in the cylinder to communicate with the inside of the ball pen refill. A piston having an inner hole is mounted at the rear of the ball pen refill so that the cylinder is covered with the piston from the rear of the piston. It may be installed and a pressurizing chamber may be formed in the cylinder to communicate with the inside of the ball pen refill.

In the pressurizing mechanism, it is preferable to mount the front portion of the cylinder in the rear inner hole of the ballpoint pen refill and the front portion of the piston in the rear end opening of the cylinder. In this case, the mounting directions of the cylinder and the piston are different. It has the effect of making it easier to wear in unison.
Further, the cylinder is preferably formed by reducing the diameter of the front portion with respect to the rear portion, and if the reduced diameter front portion of the cylinder can be mounted in the rear inner hole of the ballpoint pen refill so that it can be stored in the tubular body. Since the ink storage cylinder can be formed thick without being affected by the outer diameter of the cylinder, the capacity of the ink storage cylinder can be increased.
Further, if the inside of the ballpoint pen refill is pressurized indefinitely, the amount of ink flowing out from the tip of the ballpoint pen tip becomes too large. Therefore, it is preferable to provide a stopper to limit the moving distance of the piston back and forth with respect to the cylinder. ..

Further, it is preferable to arrange the second elastic member in a compressed state between the inner step portion formed on the inner peripheral surface of the cylinder and the front step portion formed on the outer peripheral surface of the piston. In this case, the brush When the pressure is released, the pressurizing mechanism can be returned from the pressurized state to the non-pressurized state, and even if there is a slight unevenness on the writing surface during writing, the second elastic member shrinks and vibrates. It has the effect of improving the writing feeling because it becomes possible to absorb.
Even if the second elastic member is stored in a state where the weight (own weight) of the pressure-type writing instrument body is hung on the pen tip when not in use (for example, the ballpoint pen tip is inserted in the pen stand with the ballpoint pen tip down). At its own weight, it is preferable to set the elastic force at the time of attaching the second elastic member at least higher than its own weight so that the pressurizing mechanism operates and the ink in the ballpoint pen refill does not leak.

Further, it is preferable to arrange the third elastic member in a compressed state between the front stage portion formed on the outer peripheral surface of the ballpoint pen refill and the front stage portion formed in the front region of the inner peripheral surface of the tubular body. In this case, the ballpoint pen refill is repelled backward by the elastic force of the third elastic member, thereby preventing the occurrence of a state in which the ballpoint pen refill moves back and forth during non-writing due to a dimensional error during component processing. be able to.
At least at the time of attachment, it is preferable to configure the elastic force of the second elastic member to be larger than the elastic force of the third elastic member because the pressurizing chamber is not pressurized during non-writing. By configuring the value obtained by subtracting the elastic force of the second elastic member from the elastic force of the third elastic member to be larger than the weight (own weight) of the pressurized writing instrument body, the pressurized writing instrument is used when not in use. Even if the main body is stored with its own weight hanging on the pen tip (for example, the ballpoint pen tip is inserted in the pen stand with the ballpoint pen tip down), the pressurizing mechanism operates under its own weight and the ink in the ballpoint pen refill does not leak. , More preferred.

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, so that stable ink consumption can be easily obtained and the pressure is applied. It is preferable because ink leakage from the front end of the ballpoint pen tip can be suppressed. 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.
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 ink composition for writing instruments used in the present invention is not particularly limited, such as oil-based ink, water-based ink, and shear-reducing viscosity ink, but when the writing tip is separated from the paper surface even in the writing state (brush). Since it is not pressurized (in the state where 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.

When writing on a non-penetrating surface, the writing surface is often extremely smooth, and it is difficult to generate a driving force for ball rotation at the end of the writing surface. Therefore, due to the pressing force applied to the rear end of the ink composition for writing instruments during writing, ink with good lubricity is filled around the ball receiving seat to reduce the rotational resistance, and further, on a smooth writing surface. A rotating environment can be formed by migrating the viscous ink.

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, more preferably. , 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. The handwriting width in the present invention is 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 can be measured and the average value can be used for determination.

The ball pen tip is formed by holding a ball in a ball holding portion in which the vicinity of the tip of a metal pipe is pressed and deformed inward from the outer surface, or a metal material is formed by cutting with a drill or the like. The ball is held in the ball holding part, or the ball held in the tip formed by cutting a metal pipe or metal material is urged forward by a coil spring. 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 also 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 arc surface shape 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 ballpoint pen tip, and the vertical clearance of the ball is 15 to 40 μm, which is stable. It is preferable because it can suppress the scratches and the wear of 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 arc surface shape on the bottom wall of the ball holding chamber, so that the wear of the seat is suppressed. However, since the space (volume) of the ball holding chamber excluding the balls is reduced by forming the ball seat, the ink consumption tends to decrease, but in the pressure-type writing instrument of the present invention, the pressure is applied. It is possible to eject a large amount of ink. In particular, in a ballpoint pen on which a ball having a ball 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. By setting the thickness to ~ 40 μm, preferably 20 to 30 μm, stable handwriting and ink leakage from the tip of the chip 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, or 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. Moreover, a resin molded product is mentioned as a solid ink follower. The liquid and solid ink followers can also be used together.

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.

Furthermore, 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, triltriazole, 2,5-dimercapto- Antiseptic agents such as 1,3,4-thiazidol, 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.

In addition, lubricants can be used, such as metal soaps, polyalkylene glycol fatty acid esters, ethylene oxide-added cationic activators, phosphate ester-based surfactants, β-alanine surfactants, N-acylamino acids, 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, a condensate of N-acyl-L-glutamic acid and L-lysine, a salt thereof, or the like is used.

The present invention is a pressure-type writing instrument that pressurizes a pressurizing chamber by writing pressure, and even when writing is performed with the writing instrument tilted with respect to the axis, the force component in the direction orthogonal to the axis applied to the writing core is the axis. It has been possible to provide a pressure-type writing instrument that efficiently and smoothly pressurizes the pressurizing chamber by converting it into a force component in the direction and alleviates the discomfort caused by the ballpoint pen refill retracting during writing.

It is a schematic vertical sectional view of the pressure type writing instrument of this Example. It is a schematic vertical sectional view of the pressure type writing instrument of FIG. 1 when the writing pressure is not applied to the ballpoint pen refill 5. It is a schematic vertical sectional view of the pressure type writing instrument of FIG. 1 when the writing pressure is applied to the ballpoint pen refill 5.

Next, the pressurized writing instrument of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following examples.

Example 1
FIG. 1 is a schematic vertical sectional view of the pressurized writing instrument 1 of the present embodiment, and FIG. 2 is a vertical sectional view of the pressurized writing instrument 1 of FIG. 1 in a state where the ballpoint pen refill 5 is in contact with a paper surface. 3 is a vertical cross-sectional view showing a state in which a writing pressure is applied to a ballpoint pen refill in FIG.

As shown in FIGS. 1 to 3, the pressure-type writing instrument 1 of the present embodiment has a shaft cylinder 2, a tubular body 3 movably arranged in the shaft cylinder 2, and a rear portion of the tubular body 3. A rear tubular body 4 connected to the tubular body 4, a ballpoint pen refill 5 supported by the tubular body 3 and slidable back and forth in the tubular body 3, and a pressurizing mechanism 6 arranged behind the ballpoint pen refill 5. It is composed of. The axle cylinder 2 is detachably fixed (screwed) to the rear shaft 7 and the front region of the rear shaft 7, and detachably fixed (screwed) to the front region of the front shaft 8. It is composed of a tip 9 and a tip 9.

The ballpoint pen refill 5 follows the transparent ink storage cylinder 10 made of PP resin with the ink composition 11 for writing tools obtained in the ink formulation A1 described later and the rear end of the ink composition 11 for writing tools as the ink is consumed. A grease-like ink follower 12 was directly accommodated, and the rear end portion of a ballpoint pen tip 13 rotatably holding a ball (φ0.38 mm) was press-fitted into the front end opening of the ink accommodating cylinder 10. It is a thing.

The front shaft 8 (axle cylinder 2) is formed with an opening 8a at the front end from which the ballpoint pen tip 13 of the ballpoint pen refill 5 projects. Further, the opening 8a is formed with a pressing portion 8b protruding inward, and the tip of the pressing portion 8b is subjected to curved surface processing (R processing).
Specifically, the front shaft 8 is formed by injection molding a hard polycarbonate resin, and the surface roughness (arithmetic mean roughness Ra) of the pressing portion 8b is formed to be 0.8 μm or less. ..

The front opening 9 is formed with a front end opening 9a in which the ballpoint pen tip 13 of the ballpoint pen refill 5 projects forward. Further, the inner diameter dimension of the front end opening 9a is formed to be larger than the outer diameter dimension of the ballpoint pen tip 13 so that the ballpoint pen refill 5 can be tilted in the barrel 2.

The tubular body 3 has a joint member 14 formed in a tubular shape and having a flange-shaped portion 14a protruding outward in the rear region, and a tip where the rear portion 15a is press-fitted and fixed to the inner stage portion 14b of the joint member 14. It is composed of a member 15.

Further, a first coil spring 16 (first elastic member) is stretched between the flange-shaped portion 14a of the joint member 14 and the rear end portion 8c (inner stage of the axle cylinder 2) of the front shaft 8 in a compressed state. It is hung, and the tubular body 3 and the rear tubular body 4 are repelled rearward with respect to the axle cylinder 2 by the first coil spring 16.
Specifically, the elastic force when the first coil spring 16 was attached was set to 30 gf.

The tip member 15 has a pressed portion 15b that projects outward from the outer peripheral portion of the front end, and the pressed portion 15b forms a tapered surface 15c that gradually increases in diameter toward the front in the axial direction. ..
Specifically, the tip member 15 is formed by cutting brass, and its tapered surface 15c is formed by a flat inclined surface whose diameter is expanded at an inclination of 45 degrees with respect to the axis. Further, in order to make the surface slippery, the surface of the tip member was subjected to lubrication electroless nickel plating to form the surface roughness (arithmetic mean roughness Ra) of the tapered surface surface to 0.6 μm or less.

As described above, the ballpoint pen refill 5 is arranged inside the tubular body 3, and is formed in the front portion 5a of the ballpoint pen refill 5 and the front region of the inner peripheral surface of the tubular body 3. A third coil spring 18 is stretched in a compressed state between the front stage portion 3a (the rear end of the front member 15) as a third elastic member, and the ballpoint pen refill 5 is elastically repelled rearward with respect to the tubular body 3. There is.

The pressurizing mechanism 6 is inserted into a cylindrical cylinder 19 arranged behind the ball pen refill 5 so as to be movable back and forth with respect to the shaft cylinder 2 and the rear tubular body 4, and the rear end opening 19a of the cylinder 19. A piston 20 slidably engaged in the front-rear direction, an O-ring 21 fitted to the side surface of the piston 20, and a second coil spring 17 (second) stretched between the cylinder 19 and the piston 20. It is composed of a repulsive member).

More specifically, the cylinder 19 has an inner hole 19b formed in a stepped manner penetrating the front and rear, and an air hole 19c penetrating to the inner hole 19b is formed on the outer peripheral surface of the cylinder 19. is there.
Further, in the inner hole 19b of the cylinder 19, a pressurizing space 22 (pressurizing chamber) surrounded by the inner portion 19d of the cylinder 19, the front end of the piston 20, and the O-ring 21 is formed, and the pressurized space 22 is air. The holes 19c ventilate the outside of the cylinder 19.

Further, the front portion 19e of the cylinder 19 is formed to have a smaller diameter than the rear outer peripheral portion 19f, and the front portion 19e is formed with two mounting portions 19g protruding outward in a circumferential shape. Further, the rear end inner peripheral portion 5b of the ballpoint pen refill 5 is detachably attached to the mounting portion 19g of the cylinder 19, and the pressure space 22 is formed by the inner hole 19b of the cylinder 19 to form the rear inner hole 5c (rear) of the ballpoint pen refill 5. It communicates to the end opening).
When the ballpoint pen refill 5 is mounted on the cylinder 19, the mounting portion 19g has an amount of protrusion to the outside so that the airtightness between the cylinder 19 and the ballpoint pen refill 5 is ensured and the ballpoint pen refill 5 can be easily attached and detached by hand. (Outer diameter) has been adjusted.
Specifically, the force applied when the ballpoint pen refill 5 was attached to the cylinder 19 was 2.3 kgf.

More specifically, the rear end portion 20a of the piston 20 is in contact with the bottom portion 4a of the rear tubular body 4, and the front portion 20b of the piston 20 is formed to have a smaller diameter than the rear end portion 20a.

Further, on the side surface of the piston 20, two protrusions 20c protruding outward are formed symmetrically with the axial center in between. Then, the protrusion 20c is slidably fitted in the front-rear direction to the window portion 19h formed so as to extend along the axis of the rear outer peripheral portion 19f of the cylinder 19.
Further, a groove-shaped groove portion 20d is formed on the side surface of the front portion 20b of the piston 20 in the axial direction, and an O-ring 21 (sealing member) formed of synthetic rubber is fitted in the groove portion 20d. The outer portion of the O-ring 21 is in sliding contact with the inner portion 19d of the cylinder 19, and the rear end opening 19a of the cylinder 19 is sealed by the piston 20 and the O-ring 21 so that air does not leak.
When the cylinder 19 is retracted, the flange portion 20f of the piston 20 comes into contact with the rear end of the cylinder 19 to limit the displacement of the cylinder 19 and regulate the amount of compression of the pressurizing space 22 in the cylinder 19. is there.

The second coil spring 17 (second elastic member) will be described in detail. The second coil spring 17 is stretched between the inner step portion 19i of the cylinder 19 and the front step portion 20e of the piston 20, and the piston 20. The cylinder 19 is repelled forward.

The elastic force of the second coil spring 17 (second elastic member) is set to be larger than the elastic force of the third coil spring 16 (third elastic member), and the ballpoint pen refill is set when not in use. From the elastic force of the second coil spring 17, the cylinder 19 does not move backward and the pressure space 22 is not pressurized even if the weight of the pressure-type writing tool 1 is applied to the front end portion 13a of the ballpoint pen tip 13 of 5. The value obtained by subtracting the elastic force of the 3-coil spring 16 is set to be larger than the own weight of the pressure-type writing tool 12.
Specifically, the elastic force at the time of attaching the second coil spring 18 (second elastic member) of the embodiment is 320 gf, and at the time of attaching the third coil spring 16 (third elastic member). The elastic force was 250 gf, and the weight of the pressurized writing instrument 1 was 18 g.

The pressurized space 22 is sealed when the position of the O-ring 21 is in front of the air hole 19c of the cylinder 19 due to sliding back and forth of the cylinder 19, and the position of the O-ring 21 is behind the air hole 19c. When the pressure space 22 and the outside of the cylinder are ventilated by the air holes 19c, the cylinder is in an unsealed state.

The rear shaft 7 is formed in a tubular shape having a lid portion 7a for closing the rear end, and a protruding portion 7c protruding forward is formed on the front end surface 7b of the lid portion 7a.

The rear tubular body 4 is formed in a tubular shape having a bottom portion 4a for closing the rear end, and a through hole 4b penetrating in the axial direction is formed in the center of the bottom portion 4a.
Further, a protrusion 7c of the rear shaft 7 is inserted into the through hole 4b of the rear tubular body 4, and the rear tubular body 4 and the cylinder connected to the rear tubular body 4 are connected to the shaft cylinder 2. A protrusion so that the body 3, the pressurizing mechanism 6 contained in the rear tubular body 4, and the ballpoint pen refill 5 contained in the tubular body and inserted into the pressurizing mechanism 6 (cylinder 19) can be tilted. The diameter of the through hole 4b is formed slightly larger than that of the portion 7c. The protrusion 7c is inserted into the through hole 4b so that the axis of the rear tubular body 4 is aligned with the shaft cylinder 2, and the diameter difference between the protrusion 7c and the through hole 4b should be minimized. Is desirable.

Further, a gap between the rear tubular body 4 and the tubular body 3 and the inner surface of the barrel 2 so that the rear tubular body 4, the tubular body 3 and the ballpoint pen refill 5 can be tilted with respect to the barrel 2. A portion 23 is formed, and the gap portion 23 is configured so that the gap increases toward the front.

Next, the writing operation of the pressurized writing instrument 1 of this embodiment will be described with reference to FIGS. 2 and 3.
At the time of writing, the barrel 2 is generally gripped so as to form an acute angle with respect to the axial direction (see FIGS. 2 and 3). Therefore, a writing pressure including a component orthogonal to the axial direction of the barrel 2 and a component in the axial direction is applied to the front end portion 13a of the ballpoint pen tip 13. In the pressurized writing instrument 1 of the present embodiment, when writing pressure is applied to the front end portion 13a of the ballpoint pen tip 13 from the state of FIG. 2 during writing, a component orthogonal to the axial direction of the writing pressure and a component in the axial direction are used. , The pressure space 22 in the cylinder 19 is pressurized, and the ink composition 11 for writing instruments and the ink follower 12 in the ballpoint pen refill 5 are pressed toward the ballpoint pen tip 13, thereby pressing the front end portion of the ballpoint pen tip 13. The amount of ink flowing out from 13a is increased, the writing density during writing is increased, and blurring during writing can be prevented.

Specifically, as shown in FIG. 3, the ballpoint pen refill 5 is tilted by the axial component of the writing pressure, and the pressed portion 15b of the tip member 15 (cylindrical body 3) is tilted by the pressing portion 8b of the front shaft 8. The tapered surface) is pressed forward in the axial direction.
As a result, the tubular body 3 and the rear tubular body 4 move forward against the elastic force of the first coil spring 16, and the bottom portion 4a of the rear tubular body 4 and the rear end portion 20a of the piston 20 are moved. The piston 20 also moves forward against the elastic force of the second coil spring 17 because the pistons 20 are in contact with each other.
At the same time, the axial component of the writing pressure causes the ballpoint pen refill 5 to be pressed axially backward with respect to the barrel 2. Then, the ballpoint pen refill 5 and the cylinder 19 on which the ballpoint pen refill is mounted are moved rearward with respect to the shaft cylinder 2 against the elastic force of the second coil spring 17.

That is, when a writing pressure is applied to the ballpoint pen refill 5 at the time of writing, the piston 20 first moves forward and the cylinder 19 moves backward at the same time due to the component orthogonal to the axial direction of the writing pressure and the component in the axial direction. By moving, the second coil spring 17 is compressed from both the front and rear directions. Then, the air hole 19c of the cylinder 19 moves relatively rearward from the position of the O-ring 21, and the O-ring 21 is in sliding contact with the inner portion 19d of the cylinder 19, so that the pressure space 22 is sealed. Further, when the cylinder 19 moves backward and the piston 20 moves forward, the pressure space 22 is compressed, and after the ink follower 12 arranged at the rear end of the writing ink composition 11 in the ballpoint pen refill 5. Pressure is applied to the edges.

When the writing pressure is released (when not writing), the elastic force of the first coil spring 16 and the second coil spring 17 pushes the cylinder 19 and the ballpoint pen refill 5 back in the axial direction (original position), and the piston. 20 is moved back. At that time, when the position of the air hole 19c of the cylinder 19 reaches the O-ring 21, the air hole 19c is opened to release the sealing of the pressure space 22 and the rear inner hole 5c of the ballpoint pen refill 5, and the pressure space 22 is opened. The pressure is reduced to the same pressure as the atmospheric pressure, and the pressure returns to the non-pressurized 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 11 via the ink follower 12 was 1100 hPa.

The ink compound A1 contains Pigment Black 7, which is a pigment as a coloring material, water as a solvent, and an acrylic resin (trade name: HPD-96 Johnson Polymer Co., Ltd.) as a water-soluble resin having both a pigment dispersion function and a brush stroke fixing performance. ) Was adopted, and each component was accurately weighed in a predetermined amount to obtain a pigment dispersion in which the pigment was uniformly dispersed by a ball mill. 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.

As for the ink viscosity, a B8M type viscometer manufactured by Tokimec was used to measure the viscosity of the BL rotor at a rotation speed of 12 rpm in an environment of 20 ° C.

The pressurized writing instrument of this embodiment exemplifies a state in which the front end portion 13a of the ballpoint pen tip 13 is always exposed for convenience, but it is known that the front end portion 13a of the ballpoint pen tip 13 does not come into contact with other stored items during storage. A cap may be provided, or the front end 13a of the ballpoint pen tip 13 may appear and disappear from the tip of the barrel 2, for example, a rear end knock type, a rotary knock type, a side slide type, or the like, and is particularly limited. It is not something that is done. 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.

In this embodiment, since the writing instrument ink composition 11 is configured to be pressurized only when the writing pressure is applied, the writing instrument ink composition 11 in the ink storage cylinder 10 is the ballpoint pen tip 13. It does not leak from the front end 13a.
Further, even if the shaft cylinder 2 is gripped obliquely with respect to the writing surface for writing, the writing instrument ink composition 11 in the ballpoint pen refill 5 is made more efficient by the component perpendicular to the writing pressure in the axial direction and the component in the axial direction. It was possible to pressurize well, increase the amount of ink outflow per unit time, increase the writing density during writing, and prevent blurring during writing.
Further, when the writing pressure is applied, the piston 20 is pressed from the rear by the component orthogonal to the axial direction of the writing pressure to pressurize the pressure space, so that the amount of retreat of the ballpoint pen refill 5 can be minimized. .. For this reason, it is possible to reduce the discomfort caused by the ballpoint pen refill retreating during writing, and the writing feeling is improved.
Furthermore, by configuring the pressing portion of the cylinder 2 and at least a part of the pressed portion 15 of the tubular body 3 (tip member 15) to always come into contact with each other, when writing pressure is applied to the ballpoint pen refill 5. Since the front end portion 13a of the ballpoint pen tip 13 is prevented from rattling and the pressurizing chamber of the cylinder 19 is pressurized almost at the same time as the writing operation, it is possible to write with a dark handwriting from the start of writing.
Further, in the present invention, by adopting a method of pressurizing only at the time of writing, it is possible to surely write on a non-penetrating surface which is originally difficult to write.

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 double type.

1 ... Pressurized writing instrument,
2 ... Shaft tube,
3 ... Cylindrical body, 3a ... Front stage,
4 ... Rear tubular body, 4a ... Bottom, 4b ... Through hole,
5 ... Ballpoint pen refill, 5a ... Front part, 5b ... Inner peripheral part, 5c ... Rear inner hole,
6 ... Pressurizing mechanism,
7 ... rear axle, 7a ... lid, 7b ... front end face, 7c ... protrusion,
8 ... front axle, 8a ... opening, 8b ... pressing part, 8c ... rear end,
9 ... Front mouth, 9a ... Front end opening,
10 ... Ink storage cylinder,
11 ... Ink composition for writing instruments,
12 ... Ink follower,
13 ... Ballpoint pen tip, 13a ... Front end,
14 ... Joint member, 14a ... Collar-shaped portion, 14b ... Inner stage portion 15 ... Front member, 15a ... Rear stage portion, 15b ... Pressed portion, 15c ... Tapered surface,
16 ... 1st coil spring (1st elastic member),
17 ... Second coil spring (second elastic member),
18 ... Third coil spring (third elastic member),
19 ... Cylinder, 19a ... Rear end opening, 19b ... Inner hole, 19c ... Air hole,
19d ... inner part, 19e ... front part, 19f ... rear outer peripheral part, 19g ... mounting part,
19h ... window, 19i ... inner stage,
20 ... Piston, 20a ... Rear end, 20b ... Front, 20c ... Protrusion, 20d ... Groove,
20e ... front part, 20f ... collar part,
21 ... O-ring,
22 ... Pressurized space (pressurized chamber),
23 ... Gap.

Claims (5)

A ballpoint pen refill comprising an ink accommodating cylinder filled with an ink composition for writing instruments and a ballpoint pen tip at the front portion of the ink accommodating cylinder is accommodated in the shaft cylinder.
By retracting the ballpoint pen tip in a state where the front end portion of the ballpoint pen tip protrudes from the tip opening of the barrel, the pressurizing mechanism provided in the barrel is activated, and after the ink composition for writing instruments. A pressure-type writing instrument that applies pressure to the edges
The ballpoint pen refill has a rear region supported in the barrel so that the front region can be flexed and deformed or tilted in the barrel.
Compression between a tubular body arranged so as to cover the ballpoint pen refill in the barrel, a step portion formed on the outer surface of the tubular body, and an inner step formed on the inner surface of the barrel. A first elastic member arranged in a state and a rear tubular body connected to the rear portion of the tubular body and incorporating the pressurizing mechanism are provided.
The tubular body has a pressed portion on the outer peripheral surface, and the tubular body has a pressed portion.
The barrel has a pressing portion on the inner peripheral surface, and has a pressing portion.
At least one of the pressed portion and the pressed portion is a tapered surface whose diameter gradually increases toward the front in the axial direction.
When the front region of the ballpoint pen refill is bent, deformed, or tilted, the pressed portion moves the pressed portion axially forward with respect to the barrel to pressurize the rear tubular body and the pressurizing portion. A pressure-type writing instrument characterized in that the pressure mechanism is in contact with the mechanism to operate the pressure mechanism and pressure is applied to the rear end of the ink composition for a writing instrument. The pressurizing mechanism includes a cylinder having an air hole for communicating inside and outside behind the ballpoint pen refill, a piston arranged behind the cylinder so as to be movable back and forth with respect to the cylinder, and the ballpoint pen refill inside the cylinder. A pressure chamber that communicates between the rear inner hole and the piston is provided.
The diameter-reduced front part of the cylinder is attached to the rear inner hole of the ballpoint pen refill, and the front part of the piston is attached to the rear end opening of the cylinder.
The pressure-type writing instrument according to claim 1, wherein the pressure chamber is pressurized by the piston moving relative to the cylinder forward. The cylinder is attached to the piston by a second elastic member arranged in a compressed state between the inner step portion formed on the inner peripheral surface of the cylinder and the front step portion formed on the outer peripheral surface of the piston. The pressurized writing instrument according to claim 2, wherein the ballpoint pen refill is pressed forward by the cylinder by bouncing forward. The tubular body is formed by a third elastic member arranged in a compressed state between the front stage portion formed on the outer peripheral surface of the ballpoint pen refill and the front stage portion formed on the inner peripheral surface of the tubular body. On the other hand, the ballpoint pen refill is repelled backward, and at least when not in use, the elastic force of the second elastic member is larger than the elastic force of the third elastic member. The pressurized writing instrument according to 3. 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, according to any one of claims 1 to 4. Pressurized writing instrument.

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