JP2022042092A - Stationery writing tool - Google Patents

Abstract

To provide a writing tool capable of reducing the shaft diameter of the writing tool while maintaining the writing line width even if a thick pen core is used.SOLUTION: It is a writing tool A capable of writing by supplying ink 15 in a shaft cylinder 10 which is a writing tool main body to a pen core 30 provided on the tip side of the shaft cylinder, and is provided with a step portion whose diameter expands in a radial direction on the outer circumference of the pen core and the writing tool is characterized in that a space for air replacement is formed in the axial direction of the maximum outer diameter portion.SELECTED DRAWING: Figure 1

Description

The present invention relates to a writing instrument capable of reducing the shaft diameter of a writing instrument while maintaining the writing line width even when a pen core having a thick writing line width is used.

Conventionally, when a thick pen core having a wide writing line width is used in a writing instrument, the shaft diameter of the writing instrument is also increased accordingly, and a thin pen core having a narrow writing line width is used. When used, the shaft diameter of the writing instrument was also small accordingly.
Marking pens equipped with a pen core with a wide writing line width have a large shaft diameter, so when storing them in a pencil case, take up space, for example, multiple marking pens and shafts with a thick pen core. When storing a writing tool with a small diameter in a pencil case together, there is a trouble such as having to prepare a large size of the pencil case itself.

As a writing instrument considering the size, shape, ink supply mechanism, etc. of the pen core of the writing instrument, for example,
1) A writing tool that has a valve mechanism between the pen tip and the main body that stores ink, and the valve mechanism is opened by pressing the pen tip, and the ink in the main body is guided to the pen tip. A writing instrument characterized in that the valve mechanism is open (see, for example, Patent Document 1).
2) In a marking pen that has a plurality of pen bodies and supplies ink in an ink storage unit provided in a barrel to the pen body, the pen body is made of a material that conducts ink, and the plurality of pen bodies are in direct contact with each other. A marking pen characterized in that the ink in the ink storage unit is conductively connected to the pen body (see, for example, Patent Document 2).
3) A pen tip exchangeable writing tool consisting of a shaft cylinder, an ink storage body housed in the shaft cylinder, and a replaceable pen tip connected to the ink storage body, and the ink storage of the pen tip after replacement. A pen tip exchangeable writing tool characterized in that the insertion length with the body is longer than the insertion length of the pen tip before replacement with the ink storage body, and the pen tip is for locking and for locking. A pen tip exchange type writing tool provided with a reduced diameter portion formed in front of the step portion, wherein the length of the reduced diameter portion of the pen tip after replacement is longer than the length of the reduced diameter portion of the pen tip before replacement. (See, for example, Patent Document 3),
4) A holder with a thick pen tip with a thicker diameter than a thin pen tip is detachably attached to the tip of the writing instrument shaft tube, and with the holder attached, the tip surface of the thin pen tip and the thick pen tip A writing tool provided so as to be in contact with the rear end surface of the body (see, for example, Patent Document 4).

However, the writing tools of Patent Documents 1 to 3 do not have a change in the outer diameter of the pen tip or the like, and there is no technical idea that the shaft diameter of the writing tool can be reduced. The writing tool of Patent Document 4 is a thin pen tip to which a holder with a thick pen tip of a thick diameter is simply detachably attached, and the shaft diameter of the writing tool is not changed, depending on the purpose of writing. Therefore, the thickness of the writing line can be selected by writing with a thin pen tip or a thick pen tip, but in the case of writing with a thick pen tip, air replacement etc. are not considered. , There are problems such as not being able to write well.

Japanese Unexamined Patent Publication No. 2008-265147 (Claims, FIGS. 1 to 4) JP-A-2017-52248 (Claims, FIG. 1, etc.) JP-A-2005-131896 (Claims, FIGS. 1 to 4) Japanese Unexamined Patent Publication No. 2012-176527 (Claims, FIGS. 1 to 4)

The present invention is to solve this problem in view of the above-mentioned problems of the prior art, and even if a thick pen core having a thick writing line width is used, the writing instrument can be used while maintaining the writing line width. The purpose is to provide a writing instrument that can reduce the shaft diameter.

As a result of diligent studies to solve the above-mentioned conventional problems, the present inventors supply ink in the barrel, which is the main body of the writing instrument, to the pen core provided on the tip side of the barrel to enable writing. The present invention has been completed by finding that the writing instrument of the above object can be obtained by forming a specific structure on the outer periphery of the pen core and forming a specific structure in the axial direction of the maximum outer diameter portion. It came.

That is, the writing instrument of the present invention is a writing instrument capable of writing by supplying ink in a shaft cylinder, which is a writing instrument main body, to a pen core provided on the tip side of the shaft cylinder, and is capable of writing on the outer periphery of the pen core in the radial direction. It is characterized by providing a step portion for expanding the diameter and forming a space portion for air replacement in the axial direction of the maximum outer diameter portion.
It is preferable that the shaft cylinder is provided with a valve mechanism and the minimum outer diameter portion of the rear end portion of the pen core is connected to the valve body of the valve mechanism.
The pen core used for the writing tool having the above configuration, the pen core is composed of a holder member on the outer circumference and a fine pen core on the inner circumference, and has a structure that can be exchanged with the pen core of the writing tool having the above configuration. Is preferable.
The writing tool set of the present invention is characterized by comprising the writing tool having the above structure and the pen core having the above structure.

According to the present invention, there is provided a writing instrument capable of reducing (slimming) the shaft diameter of a writing instrument while maintaining the writing line width even if a thick pen core having a thick writing line width is used.
Further, according to the writing tool set of the present invention, there is no defect in ink supply caused by replacement of the thick pen core and the thin pen core, and smooth ink supply and good writing lines of thick and thin can be obtained. Become.
The object and effect of the present invention are recognized and obtained particularly by using the components and combinations pointed out in the claims. Both the general description above and the detailed description below are exemplary and descriptive and do not limit the invention described in the claims.

It is a drawing of the writing instrument which shows an example of the Embodiment of this invention, (a) is a front view, (b) is a vertical sectional view. It is a drawing of the pen core used for the writing tool of FIG. 1, (a) is a perspective view, (b) is a plan view, (c) is a left side view, (d) is a front view, (e) is a right side view. be. It is the drawing of the writing instrument which shows the other example of embodiment of this invention, (a) is a front view, (b) is a vertical sectional view. 3A is a drawing of a pen core used for a writing tool, (a) is a perspective view, (b) is a plan view, (c) is a left side view, (d) is a front view, and (e) is a right side view. (F) is a vertical sectional view. It is a drawing which shows the other example of the pen core used for the writing tool of this invention, (a) is a perspective view, (b) is a plan view, (c) is a left side view, (d) is a front view, (e) is. It is a right side view. It is the drawing of the writing instrument which shows the other example of embodiment of this invention, (a) is a front view, (b) is a vertical sectional view. 6 is a drawing showing an example of a gripping top member serving as a connecting member for connecting the rear end portion of the pen core and the valve portion of the valve mechanism in the writing tool of FIG. 6, where FIG. 6A is a perspective view and FIG. 6B is a front view. FIG. 3C is a vertical sectional view.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to the respective embodiments detailed below, but extends to the inventions described in the claims and their equivalents.

FIG. 1 is a front view and a vertical sectional view of a writing tool showing an example of an embodiment of the present invention, and FIG. 2 is a drawing of a pen core used for the writing tool of FIG.
As shown in FIGS. 1 to 2, the writing tool A of the present embodiment includes a shaft cylinder 10 which is a writing tool main body, a writing tool ink 15 directly housed in the shaft cylinder 10, a tip shaft 20, and a pen core 30. It has at least a valve mechanism 40, and supplies ink 15 in a shaft cylinder 10 which is a writing tool main body to a pen core 30 held on a tip shaft 20 fixed to the tip end side of the shaft cylinder 10 to enable writing. ..

The shaft cylinder 10 serving as the main body of the writing tool is, for example, a polyacetal resin, a polyethylene resin, an acrylic resin, a polyester resin, a polyamide resin, a polyurethane resin, a polyolefin resin, a polyvinyl resin, a polycarbonate resin, or a polyether resin. It is formed by using a resin, a thermoplastic resin such as a polyphenylene resin, a thermosetting resin (hereinafter, each of the above resins is simply referred to as "each resin"), a metal, or the like, and is a tubular body at the rear end. The portion is closed, the tip end side is an opening 11, and the toe shaft 20 is fixed in the opening 11 by fitting.

The composition of the writing instrument ink 15 housed in the shaft cylinder 10 is not particularly limited, and a suitable compounding formulation such as a water-based ink, an oil-based ink, and a heat-discoloring ink can be prepared according to the use of the writing instrument and the like. For example, in an underline pen or the like, a fluorescent dye such as Basic Violet 11, Basic Yellow 40 or the like can be used in the ink, and a heat-discolorable microcapsule pigment or the like can be contained in the ink.

More preferably, by using a writing instrument ink containing at least water, a water-soluble organic solvent, a colorant, and glyceryl glucoside as a composition, the effect of suppressing the drying of the pen tip is excellent, and the surface of the handwriting dries quickly. Even if the handwriting is rubbed, it does not stretch, and it is possible to further prevent the handwriting from being scratched even in a low temperature environment.

The glyceryl glucoside used is α-glyceryl glucoside in which glycerin and glucose are condensed by α bond and β glyceryl glucoside condensed by β bond, and is an enzyme obtained by allowing α-glucosidase to act on a mixed solution of maltooligosaccharide and glycerin. It may be a reaction product or a product obtained by a condensation reaction of glycerin and glucose. Examples of the glyceryl glucoside include α-glyceryl glucoside and β-glyceryl glucoside, more preferably α-glyceryl glucoside, and specific examples of the α-glyceryl glucoside include αGG and αGG-L (all manufactured by JST Co., Ltd.). The amount of these glyceryl glucosides added is preferably 0.5% by mass or more and 30.0% by mass or less with respect to the total amount of the ink composition. These glyceryl glucosides may be used alone or in combination of two or more.

Examples of the water that can be used for the ink for writing tools include tap water, groundwater, ion-exchanged water, pure water, ultrapure water, and the like, and can be used without particular limitation.

The colorant that can be used in the ink for writing tools is not particularly limited, and dyes and pigments can be used.

As the dye, a water-soluble dye can be used. Specific examples of the water-soluble dye include direct dyes, acid dyes, and basic dyes. These dyes may be used alone or in combination of two or more.

Specific examples of pigments include carbon black such as furnest black, contact black, thermal black, and acetylene black, black iron oxide, yellow iron oxide, red iron oxide, ultramarine, navy blue, cobalt blue, titanium yellow, turquoise, and molybdate. Orange, titanium oxide, gold powder, silver powder, copper powder, aluminum powder, brass powder, tin powder, mica pigment, C.I. I. PIGMENT RED 2, same 3, same 5, same 17, same 22, same 38, same 41, same 48: 2, same 48: 3, same 49, same 50: 1, same 53: 1, same 57: 1, 58: 2, 60, 63: 1, 63: 2, 64: 1, 88, 112, 122, 123, 144, 146, 149, 166, 168, 170, 176, 177, 178, 179, 180, 185, 190, 194, 206, 207, 209, 216, 245, C.I. I. PIGMENT ORANGE 5, 10, 13, 16, 16, 36, 40, 43, C.I. I. PIGMENT VIOLET 19, 23, 31, 33, 36, 38, 50, C.I. I. PIGMENT BLUE 2, 15: 1, 15: 2, 15: 3, 15: 4, 15: 5, 16, 17, 17, 22, 25, 60, 66, C. I. PIGMENT BROWN 25, 26, C.I. I. PIGMENT YELLOW 1, same 3, same 12, same 13, same 24, same 93, same 94, same 95, same 97, same 99, same 108, same 109, same 110, same 117, same 120, same 139, same 153, 166, 167, 173, C.I. I. PIGMENT GREEN 7, 10, 36, and the like can be mentioned. These pigments may be used alone or in combination of two or more. Further, a pigment and a dye can be used in combination as a colorant.

When a pigment is used as the colorant, a dispersant can also be used in order to stably disperse the pigment. As the dispersant, those used as dispersants for pigments, such as water-soluble resins or water-soluble resins generally used in the past, and anionic or nonionic surfactants, can be used. The amount of these water-soluble resins and surfactants added is preferably 0.05% by mass or more and 20.0% by mass or less with respect to 10.0% by weight of the pigment. These water-soluble resins and surfactants may be used alone or in combination of two or more.

Further, a pigment dispersion in which the pigment is dispersed in an aqueous medium can also be used. As the pigment dispersion, an inorganic pigment, an organic pigment, a fluorescent pigment and the like can be used, and they may be used alone or in combination of two or more. However, when the colored resin particles are used as a colorant, those in which the resin particles are not dissolved in an organic solvent are used.

In addition to the colorants described above, colorless particles such as resin particles, wax particles, and resin emulsions can be used to adjust the color. Above all, by using polyethylene oxide wax particles, it is possible to suppress the set-off of handwriting at the same time.

Not limited to colorants and colorless particles, it is preferable to set the solid content concentration in the ink for writing tools to 25% by mass or more because the set-off of handwriting can be suppressed. Further, when the polyethylene oxide wax particles are used, even if the solid content concentration in the writing instrument ink is 25% by mass or less, the set-off of the brush stroke can be suppressed, and the content of the polyethylene oxide wax particles is 0 with respect to the total amount of the ink composition. .1% by mass or more and 50.0% by mass or less is preferable, more preferably 0.5% by mass or more and 23.0% by mass or less, and most preferably 1.0% by mass or more and 15.0% by mass or less.

The water-soluble organic solvent used in the ink for writing tools indicates an organic solvent capable of dissolving 10 g or more in 100 g of water. Among these water-soluble organic solvents, glycol ether and water-soluble organic solvents having a cyclic structure are preferable, and water-soluble organic solvents having a cyclic structure are more preferable, from the viewpoint of penetrability of handwriting into paper and suppression of pen tip drying. .. In addition, among these water-soluble organic solvents, by using a water-soluble organic solvent having a glycol ether and / or a cyclic structure in combination with a polyhydric alcohol, the pen tip is produced by the interaction between the glyceryl glucoside and the water-soluble organic solvent. It is preferable because it suppresses drying and further improves the permeability of the brush to the paper. The amount of these water-soluble organic solvents added is preferably 0.1% by mass or more and 50.0% by mass or less, and more preferably 5.0% by mass or more and 20.0% by mass or less with respect to the total amount of the ink composition. These water-soluble organic solvents may be used alone or in combination of two or more.

The viscosity of the water-based ink for writing tools is preferably 1.0 mPa · s or more and 20.0 mPa · s or less at a measurement temperature of 25 ° C. and a shear rate of 76.6 s- ¹ . Further, the surface tension is preferably 30 to 60 mN / m.

In addition to the above components, additives such as lubricants, viscosity regulators, lubricants, preservatives, fungicides, rust inhibitors, defoamers, and pH adjusters may be used in combination, if necessary. can. These additives may be used alone or in combination of two or more.

In order to produce a water-based ink for writing tools, the above-mentioned pigment and / or pigment dispersion, one or more colorants selected from dyes, water and / or an organic solvent, and a dispersant are used. After sufficiently mixing and stirring with a disperser such as a homomixer, other additives such as a viscosity modifier, a pH adjuster, a dye for adjusting the color tone, a lubricant, etc. are mixed and dissolved until they become more uniform. , It can be obtained by mixing, but in some cases, the mixed ink may be further dispersed by a disperser, or the obtained ink may be filtered or centrifuged to remove coarse particles and insoluble components. There is no problem.

The toe shaft 20 has a substantially tubular structure, has a flange portion 21 on the outer periphery of the central portion in the axial direction, and the rear side cylindrical portion 22 of the flange portion 21 is fitted into the opening 11 of the shaft cylinder 10 to form a flange. The front side of the portion 21 is a tapered tubular portion 23, and the pen core 30 is arranged in the toe shaft 20.

As shown in FIGS. 2A to 2E, the pen core 30 has a large diameter portion 32 having a writing portion 31 on the tip side, a medium diameter portion 33 on the center portion side, and a small diameter portion 34 on the rear end side in this order. The diameter is reduced to the above, and a step portion 35 that expands in the radial direction is provided on the outer periphery on the front side of the medium diameter portion 33, and a groove shape for air replacement in the axial direction of the large diameter portion 32 that is the maximum outer diameter portion ( A concave) space 36 is formed. The shape, length, number, and the like of the space portion 35 for air replacement are not particularly limited as long as the ink supply and air replacement are efficiently and smoothly performed during writing. For example, a flat surface is used. It may be in the form.
The pen core 30 has a bullet-shaped (round core) on the writing portion 31 side, which is the tip thereof. In addition to the round core, it may be a square core.

The pen core 30 having the above configuration is entirely composed of a porous member, and for example, natural fiber, animal hair fiber, polyacetal resin, polyethylene resin, acrylic resin, polyester resin, polyamide resin, etc. Processing or processing of parallel fiber bundles consisting of one or more combinations of polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether resin, polyphenylene resin, etc., fiber bundles such as felt, etc. A fiber core made by processing a fiber bundle with a resin, or a porous body made by sintering plastic powder such as a polyolefin resin, an acrylic resin, a polyester resin, a polyamide resin, or a thermoplastic resin such as a polyurethane resin (sintered core). ), Extruded core, etc.
Preferred pen cores 30 include fiber bundle cores, fiber cores, sintered cores, felt cores, inorganic porous cores, and the like, and may be coated fiber cores whose outer periphery is further coated with a resin film or the like. It is a thing. The porosity, hardness, and the like of the pen core 30 to be used vary depending on the type of ink, the type of writing instrument, and the like. For example, the porosity is preferably 30 to 60%. Further, in the present invention, the "porosity" is calculated as follows. First, a writing core having a known mass and apparent volume is immersed in water, sufficiently immersed in water, and then the mass is measured in a state of being taken out of the water. From the measured mass, the volume of water soaked in the writing core is derived. The porosity is calculated from the following formula, assuming that the volume of this water is the same as the volume of the pores of the writing core.
Porosity (unit:%) = (volume of water) / (apparent volume of pen core 30) x 100

A valve mechanism 40 is built in the rear end side of the front shaft 20 fixed in the shaft cylinder 10. As shown in FIG. 1B, the valve mechanism 40 includes a valve holder 41, a valve body 42, a valve seat 43, and an elastic member 44 including a spring.
The valve holder 41 is a tubular body having a flange 41a at the tip and an ink flow hole 41b formed at the rear surface. The rear portion of the valve body 42 is movably mounted in the ink flow hole 41b.
The valve body 42 has an umbrella-shaped annular protrusion 42a formed on the peripheral surface of the central portion thereof. The tip of the valve body 42 is provided with a hollow opening 42b, and the rear end of the minimum outer diameter portion 34 of the rear end of the pen core 30 is fitted and connected to the opening 42b (the tip surface of the valve body 42). ing.

Further, a cylindrical valve seat 43 having a length dimension shorter than that of the valve holder 41 is attached to the tip end portion of the valve holder 41. The valve seat 43 is positioned on the valve holder 41 by the flange portion 43a around the valve seat 43 coming into contact with the tip end surface of the flange of the valve holder 41. The peripheral surface of the valve body 42 is configured to abut and detach from the concave seat surface 43b at the rear of the valve seat 43 to perform a valve function.
Further, the elastic member 44 is mounted between the valve body 42 and the valve holder 41. The elastic member 44 returns the valve body 42 separated from the valve seat 43 to a state in which the valve body 42 comes into contact with the valve seat 43 due to the repulsive force of the elastic member 44. The valve holder 41, the valve body 42, and the valve seat 43 are made of a resin material. The elastic member 44 is composed of a spring member such as SUS or resin.
In the present embodiment, a cylindrical ink absorbing member 36 is mounted on the outer periphery of the medium diameter portion 33 of the pen core 30 on the rear end side of the tubular portion 23 of the toe shaft 20. The liquid absorbing member 36 absorbs (absorbs) excess ink that flows from the valve mechanism 40 to the pen core 30 side by operating the valve, and suppresses ink leakage from the writing tool A. ..

In the writing tool A configured as described above, ink is supplied and shut off to the writing portion 31 of the pen core 30 by the following operations and actions.
When the writing portion 31 is pressed (pumped) against the paper surface while resisting the repulsive force of the elastic member 44, the writing portion 31 moves backward with respect to the front cylindrical portion 23, and the valve body 42 is moved backward. Press to. Then, the pressed valve body 42 is separated from the valve seat 43, the valve is opened, and the ink contained in the barrel 10 is supplied to the writing portion 31 by the capillary tube of the pen core 30.
On the other hand, when the writing portion 31 is separated from the paper surface, the writing portion 31 and the valve body 42 of the pen core 30 move to the front due to the repulsive force of the elastic member 44. Then, the valve body 42 that has moved to the front side abuts on the valve seat 43, closes the valve, and shuts off the ink supply.
In the present embodiment, the pen core 30 has a step toward the rear side, and is configured to slip into the valve mechanism (valve) 40 at the time of pumping.

In this embodiment, the shaft diameter is reduced by 60% (inner diameter φ is 16.5 mm to 10.3 mm) even if a thick pen core [writing line width (actual size) is 1.8 to 2.5 mm] is used. That is, a writing tool with a shaft diameter of 10.3 mm for a thin pen core [writing line width (actual size) of 0.9 to 1.4 mm] and a thick pen core [writing line width (actual size) of 1.8 to Even if 2.5 mm] is used, the thick pen core 30 has a groove-shaped (concave) space portion 35 for air replacement, so that the ink supply is smooth and writing is performed well. It was found that the shaft diameter of the writing tool can be reduced (60% slimmer) while maintaining the writing line width (1.8 to 2.5 mm). As a result, even with a thick pen core, the shaft diameter has been slimmed down, and with a novel and smart writing tool that has never been seen before, the hassle of carrying it can be eliminated, and people can use it daily, such as carrying a multicolored pen set. As a result, the motivation for art crafting will be satisfied.
In the present embodiment, even if a thick pen core having a thick writing line width is used, the maximum outer diameter of the pen core 30 can be effectively exhibited from the viewpoint that the shaft diameter can be reduced without impairing the function as a writing tool. Is preferably 20% to 50% of the shaft diameter of the shaft cylinder (writing tool main body) 10.
Further, a pen core having an outer diameter larger than the inner diameter of the ink absorbing member 37 is mounted, and the distance (gap) between the outer diameter end surface of the pen core 30 and the end surface of the ink absorbing member 37 is 2 mm or more. More preferably, the structure is 2 mm or more and 6 mm or less. As a result, it is possible to prevent the ink from being compressed and bubbles are generated during pumping to hinder the ink outflow.

3 and 4 are a front view and a vertical sectional view of a writing tool showing another example of the embodiment of the present invention, and drawings of a pen core used for the writing tool. In each embodiment after FIG. 3, the same configurations as the writing tool A and the pen core of FIGS. 1 and 2 show the same illustrated reference numerals, and the description thereof will be omitted.
As shown in FIGS. 3 to 4, the writing tool B of the present embodiment has a fine pen core 38a in which the pen core 38 is smaller than the outer diameter (large diameter portion 32) of the pen core 30 of the writing tool A of the above embodiment. The point that the large-diameter portion is omitted and the medium-diameter portion 33a and the small-diameter portion 34a are formed, and the outer diameter (medium-diameter portion 33a) of the fine pen core 38a is the pen core of the writing tool A of the above embodiment. Since it is smaller than the outer diameter of 30 (large diameter portion 32), a holder member 50 having the same outer diameter as the outer diameter of the pen core 30 (large diameter portion 32) is attached to the outer periphery of the fine pen core 38a and inside the toe shaft 10. The holder member 50 is provided with a space portion 51 for air replacement in the axial direction, and the pen core 38 is composed of a holder member 50 on the outer circumference and a fine pen core 38a on the inner circumference. It is different from the writing tool A of the above embodiment in that the pen core 30 and the pen core 30 are interchangeable with each other.

In the writing tool B configured as described above, and in the writing tool set of the writing tool A and the pen core 38, the above-mentioned thick pen core 30 [writing line] having the same outer diameter as the pen core 38a to which the holder member 50 is attached. The width (actual size) is 1.8 to 2.5 mm], and it can be fixed to the shaft body 10 (front shaft 20) of the writing tool, and the holder member 50 has a separation shape for air replacement in the axial direction. Since the space portion 51 (the space portion 51 having a smaller body integral than the space portion 36 of the pen core 30 described above) is provided, the ink can be smoothly supplied to the thin pen core 38a and the writing can be performed well. Moreover, since the pen core 30 and the pen core 38 are interchangeably mounted, there is no defect in ink supply caused by the replacement of the thick pen core and the thin pen core, and the ink is smooth. It is possible to obtain a writing tool and a writing tool set that can obtain good writing lines for supply, thickening, and thinning.

FIG. 5 is a drawing of a pen core which is another example of the embodiment of the present invention.
As shown in FIGS. 5A to 5E, the pen core 39 of the present embodiment has a structure of the pen core 38 for air replacement in the axial direction of the pen core 30 of the writing tool A of the above embodiment. It differs from the writing tool A of the above-described embodiment in that the length of the shaped (concave) space portion 50 is reduced to form a face-cut space portion 39a.
As with the writing instrument A, the pen core 39 can be used as a writing instrument with smooth ink supply and good writing, and even if a thick pen core is used, the writing line width thereof. It was found that the shaft diameter of the writing instrument can be reduced (60% slimmer) while maintaining the above.

6 and 7 are a front view and a vertical sectional view of a writing tool showing another example of the embodiment of the present invention, and drawings of a pen core.
As shown in FIGS. 6 to 7, the writing tool C of the present embodiment has the rear end of the pen core 30 without connecting the minimum outer diameter portion of the rear end of the pen core 30 to the valve body 42 of the valve mechanism 40. It differs from the above-mentioned writing tools A and B in that the portion and the tip of the valve body 20 are connected via the gripping piece member 60.
The gripping top member 60 has the same outer diameter as the protrusion 61 that fits into the fitting recess 33a formed in the middle diameter portion 33 of the rear end portion of the pen core 30 on the tip end side. It is composed of a main body portion 62 and a rear end portion 63 fitted in the opening 42b of the valve body 42 on the rear end side. In addition to the above fitting, when the gripping top member 60 is used, it may be connected with an adhesive.
Like the writing tools A and B, the writing tool C of this embodiment also has a smooth ink supply and can write well, and even if a thick pen core is used, the writing line width is maintained. Since the shaft diameter of the writing tool can be reduced (60% slimmer) and the pen core 38 of the writing tool B can be exchanged with each other, the thick pen core and the thin pen core can be attached in the same manner as the writing tool B. There is no defect in ink supply caused by replacement, and a writing tool and writing tool set that can obtain smooth ink supply and good thick and thin writing lines can be obtained.

Furthermore, in the writing tools A to C of each of the above embodiments, the inks for writing tools (water-based ink, oil-based ink, heat-discoloring ink) have been described, but liquids such as liquid cosmetics, liquid chemicals, coating liquids, and correction fluids have been described. It is good as a body.

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples.

[Example 1]
A writing tool having a pen core conforming to the following configuration and FIGS. 1, 2 and 4, a pen core, and a writing tool ink having the following composition were used. For the dimensions of the pen core and writing instrument, the sizes shown below were used.

(Composition of stationery)
Shaft cylinder 10: Made of polypropylene, length 120 mm, central inner diameter φ7 mm; outer diameter φ10 mm
Pen core 30: Polyester fiber core, total length 25 mm, maximum outer diameter part φ4 mm, medium diameter part φ2 mm, minimum outer diameter part φ1.5 mm, air replacement space 36: width 1 mm, depth 0.4 mm, porosity 70 %
Ink liquid absorbing member 37: Made of urethane, porosity 80%, size: φ7 x 2 mm
Valve mechanism: Except for elastic member 44 (made of stainless steel), polypropylene pen core 38: polyester fiber core, total length 30 mm, medium diameter part 33a: φ2 mm, minimum outer diameter part 34a: φ1.5 mm, porosity 70%
Holder member 50: Made of polyacetal, total length 10 mm, wall thickness 1 mm
Space for air replacement 51: Width 1 mm, depth 1 mm

(Ink composition for writing tools, ink color: black)
As the ink for writing tools, inks having the following composition (total 100% by mass) were used.
Activator: Megafuck F410 (fluorine-based anionic surfactant, perfluoroalkyl group-containing carboxylate, manufactured by DIC Corporation) 1% by mass
Antifungal agent: Benzoisothiazolin-3-one 0.2% by mass
Glyceryl glucoside aqueous solution: αGG (high concentration α glyceryl glucoside aqueous solution, α glyceryl glucoside 60% aqueous solution, manufactured by JTS Co., Ltd.) 3% by mass
Pigment water dispersion: FUJI SP BLACK 8041 (black pigment water dispersion, solid content 20%, manufactured by Fuji Dye Co., Ltd.) 20% by mass
Water-soluble organic solvent: glycerin 5% by mass
Water-soluble organic solvent: Ethylene glycol 5% by mass
Water (solvent): Ion-exchanged water 65.8% by mass
Viscosity (25 ° C): 3.6 mPa · s (Complate type viscometer, manufactured by TOKIMEC, TV-20)
Surface tension (25 ° C): 40 mN / m (automatic surface tension meter, manufactured by Kyowa Interface Science, DY-300)

In the writing tool A equipped with the writing tool ink having the above configuration, the shaft diameter is reduced by 60% (inner diameter φ) even if a thick pen core 30 [writing line width (actual size) is 1.8 to 2.5 mm] is used. 11.6 mm to 7 mm), that is, a writing tool with a shaft diameter (outer diameter) of 10 mm for a thin pen core 38 [writing line width (actual size) is 0.9 to 1.4 mm] and a thick pen core 30. Even if [writing line width (actual size) is 1.8 to 2.5 mm] is used, the thick pen core 30 has a groove-shaped (concave) space portion 35 for air replacement, so that the ink can be used. It was confirmed that the supply was smooth, writing was good, and the shaft diameter of the writing tool could be reduced (60% slimmer) while maintaining the writing line width (1.8 to 2.5 mm). ..
Further, in the writing tool set of the writing tool A and the pen core 38, the thick pen core 30 [writing line width (actual size) is 1.8, which has the same outer diameter as the pen core 38 to which the holder member 50 is attached. It can be fixed to the shaft body 10 (front shaft 20) of the writing tool using [~ 2.5 mm], and the holder member 50 has a space portion 51 (the above-mentioned pen) for air replacement in the axial direction. Since the space portion 51), which has a smaller body integration than the space portion 36 of the core 30, is provided, ink can be smoothly supplied to the thin pen core 38, writing can be performed well, and the pen core can be written well. Since the structure is such that the 30 and the pen core 38 can be mounted interchangeably with each other, there is no defective ink supply caused by the replacement of the thick pen core 30 and the thin pen core 38, and smooth ink supply, thickening, and thinning are possible. It was confirmed that a smart writing tool and a writing tool set that can obtain good writing lines can be obtained.

In the present invention, even if a thick pen core is used, it is suitably used for writing instruments such as marking pens, felt-tip pens, and paint markers that can reduce (slim) the shaft diameter of the writing instrument while maintaining the writing line width.

10 Shaft cylinder 18 Writing tool ink 20 Tip shaft 30 Pen core (thick pen core)
36 Space for air replacement 38 Pen core (thin pen core)
40 Valve mechanism 42 Valve body 50 Holder member 60 Gripping top member

Claims (4)

It is a writing instrument that enables writing by supplying ink in the shaft cylinder, which is the main body of the writing instrument, to the pen core provided on the tip side of the shaft cylinder. A writing instrument characterized by forming a space for air replacement in the axial direction of the maximum outer diameter. The writing tool according to claim 1, wherein the shaft cylinder is provided with a valve mechanism, and the minimum outer diameter portion of the rear end portion of the pen core is connected to the valve body of the valve mechanism. The pen core used for the writing tool according to claim 1 or 2, wherein the pen core is composed of a holder member on the outer periphery and a fine pen core on the inner circumference, and the pen of the writing tool according to claim 1 or 2. A pen core characterized by having a structure that can be exchanged with the core. A writing tool set comprising the writing tool according to claim 1 or 2 and the pen core according to claim 3.

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