JP7011893B2 - Stationery - Google Patents

Description

The present invention relates to a direct liquid type writing tool in which ink is directly stored in an ink tank and a porous member is interposed between the ink tank and the pen tip.

Conventionally, a type of direct liquid type writing tool in which ink is directly stored in an ink tank has been known to have a wide variety of structures.
For example, 1) A housing made of an elastic material made of polyethylene synthetic resin having a flange and small holes is fitted to the head of the shaft cylinder that stores the liquid ink as it is, and the cotton-like felt filled therein is placed at the end of the shaft cylinder. Structure of a felt pen that is formed by inserting the tail end of a felt pen inserted into the shaft neck of the shaft neck lid to be screwed (see, for example, Patent Document 1), 2) From a porous material between the pen tip and the ink tank. A direct-liquid writing tool in which an ink storage body is provided, and a partition wall is provided between the ink storage body and the ink tank so as to have a communication hole for communicating between the ink storage body, and a pen from the ink tank is provided on the partition wall. A direct-liquid writing tool (for example, a patent) characterized in that a rod-shaped ink guiding member for supplying ink is pierced first, and a reduced diameter portion for enhancing the capillary force is provided at the rear end portion of the ink storage body. (Refer to Reference 2)) 3) In a liquid coating tool having an ink reservoir member (so-called collector member) in the barrel that temporarily stores overflow ink in response to a change in pressure in the ink tank, the ink reservoir member is in the barrel. A partition wall is provided at a position closer to the center from the opposite end on the arrangement side of the ink tank, and the space inside the shaft cylinder between the rear end of the ink storage member and the partition wall is used as an ink tank, and the partition on the outer surface of the shaft cylinder is used. A liquid coating tool (see, for example, Patent Document 3) characterized in that the position around the wall is formed opaque is known.

However, in the writing tool disclosed in Patent Document 1, the ink is sequentially infiltrated into the felt-tip pen from the small hole through the felt and supplied, but when the distance from the small hole to the felt-tip pen is long, the ink is supplied. Ink supply to the felt-tip pen, which is the pen tip, is interrupted or defective, and it is difficult to adjust a stable interval because it is necessary to form a gap between the two parts, so ink is supplied. There was a problem that it was difficult to achieve both property and ink dripping.
In the writing tool disclosed in Patent Document 2, the tip of the ink guiding member serves as a pen core (writing portion), the ink guiding member has a uniform capillary force, and the ink is the rear portion of the ink guiding member. It is supplied to the ink guiding member via the pointed member fixed to the ink guide member, but when the distance from the pointed piece member to the pen core (writing part) which is the tip of the ink guiding member is long (far), Similar to the above-mentioned Patent Document 1, there is a problem that the ink is not smoothly supplied to the pen core (writing part) which is the tip of the pen tip.
The above-mentioned Patent Document 3 requires a collector member for air replacement at the time of ink supply, has a large number of parts, and has a different technical concept (configuration and its action and effect) from the present invention.

On the other hand, as a writing tool in which a batting (ink storage body or core) filled with ink is housed in a barrel and one end of a pen tip is brought into contact with the batting, for example, 1) the batting is configured by using crimp fibers. The thickness of the fiber in the central part is 1.5 to 4 denier, the thickness of the fiber in the peripheral part is 1.5 to 3 times the thickness of the central part, and the occupied cross-sectional area of the central part is the toecap. The core of a writing felt-tip pen (see, for example, Patent Document 4), which is characterized by not being smaller than the cross-sectional area of the base of the shaft, and 2) the shaft tube, and between the small-diameter fibers and the fibers as compared with the small-diameter fibers. In a writing instrument composed of large-diameter fibers having a large gap between the two, and provided with a batting housed in the barrel and a pen tip in which one end is brought into contact with the batting and the other end is exposed from the barrel. , A writing tool (see, for example, Patent Document 5) characterized in that the large-diameter fiber occupies a ratio of 5 to 30% of the whole batting.

The above-mentioned Patent Documents 4 and 5 are not a direct liquid type writing tool in which ink is directly stored in an ink tank, but a so-called batting type writing tool. ) Is different.

Jikken No. 35-3317 (Claim for Registration, Fig. 2) JP-A-11-301168 (Claims, FIG. 1) Japanese Unexamined Patent Publication No. 2001-113877 (Claims, FIG. 1) Japanese Patent Application Laid-Open No. 53-104318 (Claims, FIGS. 1, 2) JP-A-2015-120257 (Claims, FIG. 3)

The present invention attempts to solve this problem in view of the above-mentioned conventional problems, and ensures that ink is supplied to the pen tip even if the distance between the air replacement portion and the pen tip (pen core) is long. It is an object of the present invention to provide a direct liquid type writing tool having merits such as a simple ink supply mechanism and a finer axis because a pipe or the like for ink supply is not required.

As a result of diligent studies to solve the above-mentioned conventional problems, the present inventor has a pen tip, an ink tank for directly accommodating ink, and at least one ink provided on the pen tip side of the ink tank. It has been found that the writing tool of the above object can be obtained by providing at least an outflow hole and a porous member having a specific structure, and the present invention has been completed.

That is, the writing tool of the present invention is a porous member having a pen tip, an ink tank for directly accommodating ink, at least one ink outflow hole provided on the pen tip side of the ink tank, and a high-density portion. The ink outflow hole is characterized in that one end of a high-density portion of the porous member is in contact with the ink outflow hole and the other end of the high-density portion is in contact with the pen tip.
It is preferable to use a fiber diameter smaller in the central portion of the porous body member than in the outer peripheral portion.
It is preferable to have a compression portion in the vicinity of the ink outflow hole of the porous body member.

According to the present invention, ink can be reliably supplied to the pen tip even if the distance between the air replacement portion and the pen tip (pen core) is long, and since it is a direct liquid type, the flow rate is stable. The ink supply mechanism is easy to read because it is not faint, the remaining amount is easy to read, it can be written upward even with a direct liquid type, it can be combined with various pen tips, and a pipe for ink supply is not required. A direct-liquid writing instrument is provided that has many advantages such as simplicity and easy design of ultra-thin and thick shafts.

An example of an embodiment of the writing instrument of the present invention is shown, where (a) is a plan view and (b) is a central vertical sectional view. FIG. 3 is a partial cross-sectional perspective view showing a state in which the porous member is removed in the writing tool of FIG. 1. An example of another embodiment of the writing instrument of the present invention is shown, where (a) is a plan view and (b) is a central vertical sectional view. FIG. 3 is a partial cross-sectional perspective view showing a state in which the porous member is removed in the writing tool of FIG. An example of another embodiment of the writing instrument of the present invention is shown, where (a) is a plan view and (b) is a central vertical sectional view. (A) to (e) are drawings showing the pen tip (state in which the writing core is attached to the holder) in the writing instrument of FIG. 5, (a) is a front view, and (b) is the center of (a). A vertical sectional view, (c) is a rear view, (d) is a perspective view seen from the rear on the front side, and (e) is a perspective view seen from the rear on the back side. 5 shows the ink exchange of the writing instrument of the embodiment shown in FIG. 5, in which FIG. 5A is a plan view and FIG. 5B is a central vertical sectional view. An example of another embodiment of the writing instrument of the present invention is shown, where (a) is a plan view and (b) is a central vertical sectional view.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 show a first embodiment of the writing instrument of the present invention, FIG. 1A is a plan view, FIG. 2B is a central vertical sectional view, and FIG. 2 is a writing instrument of FIG. It is a partial cross-sectional perspective view which shows the state which the porous body member was removed.
As shown in FIGS. 1A and 1B, the writing tool A of the first embodiment has an in-tank shaft cylinder 10, a tip shaft 20, a liquid ink 25, a porous member 30, a joint 35, and a holding body. It is equipped with 40 and a pen tip (writing part: pen core) 50.

The shaft cylinder 10 is formed in a bottomed cylinder shape using, for example, a thermoplastic resin, a thermosetting resin, or the like, and as shown in FIG. 1 (b), the liquid ink is directly stored in the ink cylinder 10. It constitutes a tank.
The shaft cylinder 10 is formed opaquely or transparently (and translucently) in whole or in part thereof, but any of them may be adopted from the viewpoint of appearance and practical use. In the present embodiment, the ink accommodating portion of the shaft cylinder 10 can be visually recognized in order to make the remaining amount easy to read.

The front shaft 20 has a front tubular portion 21 for internally holding a porous member 30, a joint 35, and the like on the front portion on the pen tip side, and a rear tubular portion 22 on the rear side. The outer periphery of the tubular portion 22 is configured such that the tip opening of the shaft cylinder 10 is fixed by fitting.
Further, the inside of the rear tubular portion 22 is tapered toward the front tubular portion 21 side, and an ink outflow hole 23 having a small diameter is formed in the central portion, and communicates with the front tubular portion 21 to form a shaft. The structure is such that the liquid ink 25 directly housed in the cylinder 10 passes through the ink outflow hole 23.
The toe shaft 20 having this structure is formed of, for example, a resin made of PP or the like.
Further, as shown in FIG. 2, the air entering the shaft cylinder 10 from the pen tip 50 is hung from the front portion of the tip shaft 20 to the ink outflow hole 23 and formed on the inner surface between the plurality of ribs 24, 24 ... and a porous body. After passing through the gap of the member 30 and once passing through the porous member 30, it reaches the ink outflow hole 23 and is replaced with the liquid ink 25.

Examples of the liquid ink 25 directly stored in the shaft cylinder 10 serving as an in-tank include water-based ink and oil-based ink. Preferably, the measured value of the viscosity of the cone plate type viscometer (ELD type rotational viscometer) at 25 ° C. for water-based ink and oil-based ink at a shear rate of 191.5 (S ^-1 ) is 2 to 30 (mPa. A relatively low viscosity ink of s) is suitable. The ink composition to be used includes pigments (including resin pigments), colorants such as dyes, main solvents, resins, thickeners, etc., depending on the application (water-based ink, oil-based ink) and writing instrument type (marking pen, ballpoint pen, etc.). Any component contained in the ink for writing instruments can be used.
As the optional component, for example, a rust preventive, an antifungal agent, a surfactant, a lubricant, a wetting agent and the like that can be compatible with each other without adversely affecting the ink can be contained. In ink for ballpoint pens, fatty acids and the like can be suitably used as a lubricant. Further, as an additive for suppressing drying, a non-volatile solvent or the like compatible with the main solvent can be contained within a range that does not adversely affect the product characteristics.

The overall shape of the porous member 30 is a columnar body, and the high-density portion 31 having a high capillary force in the central portion in the longitudinal direction and the outer peripheral portion of the high-density portion 31 have a lower capillary force than the high-density portion 31. It is provided with a low density portion 32. The high-density portion 31 and the low-density portion 32 may have a structure in which the capillary force is different by making the fiber density, the fiber fineness, the pore ratio, etc. different (capillary force: high-density portion 31> low-density portion 32). For example, the material, molding method, manufacturing method, etc. are not particularly limited, and for example, natural fiber, animal hair fiber, polyacetal resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, polyolefin resin, etc. Fibers, fiber bundles, felts, etc. consisting of one or more combinations of polyvinyl resin, polycarbonate resin, polyether resin, polyphenylene resin, etc., and porous bodies such as sponge, resin particles, sintered body, etc. When the above fibers or the like are used, for example, a fiber having a fine fiber diameter (small diameter fiber) is used to form a high-density portion 31, and a fiber thicker than the fine fiber diameter is formed. The low density portion 32 can be formed by using the diameter (thick diameter fiber).
In the configuration of this type of porous member 30, each fiber extends in the longitudinal direction and includes a small diameter fiber and a large diameter fiber. The small diameter fiber and the large diameter fiber are wrapped by a wound film. At this time, the large-diameter fibers are collectively arranged at the center of the porous body member. The porous member is formed by bundling the small-diameter fibers and the large-diameter fibers in a tubular shape and wrapping them with a roll film. At this time, as the wound film, there are a method of wrapping the porous body member with a film such as a resin, a method of coating the outer peripheral portion of the porous body member, and the like.
The high-density portion 31 and the low-density portion 32 are integrally molded using the above materials (same material or different materials), or are formed separately (with two members), and are combined with the high-density portion 31 in the final step or the like. The low-density portion 32 can be integrated by fitting, welding, sewing, or the like.
As long as the overall shape of the porous member 30 is a columnar body, the outer peripheral shape thereof is not particularly limited, such as a columnar shape, an elliptical columnar shape, and a square columnar shape. In this embodiment, it is composed of a cylinder.
Further, the high-density portion 31 does not have to be in the central portion, and may be formed in at least one location in the low-density portion 32.

As the preferable porous member 30, the capillary force of the high-density portion 31 is M1 and the capillary force of the low-density portion 32 is M2 from the viewpoint of good discharge of the liquid ink 25 from the ink outflow hole 23 and the resistance to DC. When the capillary force M1 is 1, the capillary force of M2 is preferably 0.5 to 0.95, and particularly preferably 0.6 to 0.75. If the capillary force M2 is less than 0.5, the ink that has entered the low density portion may drip, while if it is 1.0 or more, the ink that has entered the low density portion returns to the ink tank. It may not be possible.
For the adjustment of the capillary forces M1 and M2 within the above range, for example, when the material of the porous body member 30 is composed of the above fibers, the high-density portion 31 and the low-density portion 32 are used with a thin fiber diameter and a thick fiber diameter. If the material of the porous member 30 is a material such as a sponge, resin particles, or a porous body such as a sintered body, the porosity can be high or low.
In the present invention, the capillary force is a force for raising the liquid ink, and a silicone tube is placed in a container containing ink, and one of them is an object to be measured (ink occlusion body, relay core, pen tip). And fill the inside of the tube with ink. At this time, the inside of the object to be measured is filled with ink, and the ink is filled up to the upper end of the object to be measured. Then, the lower end of the object to be measured is gradually raised. At this time, meniscus is generated at the upper end of the object to be measured, and the ink column is held by the capillary force of the object to be measured. The distance (x) between the lower end of the object to be measured and the liquid level can be obtained by comparing the heights of the ink columns supported by the object to be measured.

The porous member 30 having the above configuration is filled (accommodated) in the front tubular portion 21 of the front shaft 20, and the rear end surface of the porous member 30 is in close contact with the rear end wall surface 21a of the front tubular portion 21. The ink outflow hole 23 is configured so that the rear end surface, which is one end of the high-density portion 31 of the porous body member 30, is in contact with the ink outflow hole 23. In the present embodiment, the area of the rear end surface of the high-density portion 31 is larger than the area of the ink outflow hole 23, and the structure is such that the ink can flow out from the ink outflow hole 23 satisfactorily by the capillary force.

The area S1 (= contact area) of the hole diameter of the ink outflow hole 23 and the area S2 of the high-density portion 31 vary depending on the structure of the pen tip 50, the viscosity of the ink type, the capillary force of the high-density portion 31, etc. From the viewpoint of improving the leakage property, it is preferable that S1: S2 is 1: 2 to 1:16.
The porous member 30 filled in the front tubular portion 21 is held in the front tubular portion 21 by mounting the tubular joint 35 in the front tubular portion 21 by fitting. It has a structure like that. A holding body 40 is fitted in the joint 35 mounted in the front tubular portion 21, and a writing portion 50 is held in the holding body 40 by fitting, and a pen tip (pen) is held. The rear end surface of the core) 50 is in contact with the front end surface which is the other end of the high-density portion 31 of the porous member 30 (reference numeral 33 in the figure).

The material, shape, structure, manufacturing method, etc. of the pen tip 50 are not particularly limited, and may be, for example, from one type or a combination of two or more types such as natural fiber, animal hair fiber, and synthetic resin (plastic). Parallel fiber bundles, fiber cores made by processing fiber bundles such as felt or resin processing of these fiber bundles, plastic cores having ink grooves formed in the axial direction of the various plastic materials mentioned above, various plastic powders described above, etc. are fused. Examples thereof include a plastic body, a brush body, and the like, and the form thereof is arbitrary such as a plate-like body, a fiber bundle body, a sintered body, and a foam body, and any combination with the porous body member 30 is possible. The pen tip (pen core) 50 of the present embodiment is composed of a fiber core having a fine tip.

In the writing instrument A of the present embodiment, ink for writing instruments is housed in a shaft cylinder 10 which is an ink tank of the writing instrument, and a porous member 30, a joint 35, a holding body 40, and a writing portion (pen) which is a pen tip are stored in the tip shaft 20. The writing instrument A can be easily manufactured by fixing the writing instrument A to which the core) 50 is attached to the opening of the shaft cylinder 10 by fitting or the like.

In the writing tool A configured as described above, the liquid ink 25 directly housed in the ink tank 10 passes through the ink outflow hole 23 to the high-density portion 31 of the porous member 30 and the writing portion (pen core) 50. The structure is such that the ink flows out in good order due to the force of the capillaries. Further, even when the ink supply from the shaft cylinder 10 serving as the ink tank such as the pen tip upward shape or the change in the ink tank internal pressure to the high density portion 31 via the ink outflow hole 23 is insufficient, the low density portion 32 is provided. Writing is possible because the impregnated liquid ink can be supplied to the pen tip 50 via the high-density portion 31.
In this writing tool A, ink can be reliably supplied to the pen tip 50 even if the distance between the vicinity of the ink outflow hole 23 serving as the air replacement portion and the pen tip (pen core) 50 is long, and the direct liquid type Therefore, the flow rate is stable, it does not fade, the remaining amount is easy to read, it can be written upward even with a direct liquid type, it can be combined with various pen tips, and no pipe etc. for ink supply is required. Therefore, the ink supply mechanism becomes simple, and a direct-liquid writing tool having many merits such as easy design of an ultra-fine shaft and a thick shaft can be obtained.

3 and 4 show a second embodiment of the writing instrument of the present invention, FIG. 3A is a plan view, FIG. 4B is a central vertical sectional view, and FIG. 4 is a writing instrument of FIG. It is a partial cross-sectional perspective view which shows the state which the porous body member was removed.
In the following second to fourth embodiments, those having the same configuration and function as the writing tool A of the first embodiment are designated by the same reference numerals in the drawings, and the description thereof will be omitted.
As shown in FIGS. 3 and 4, the writing tool B of the second embodiment has a shaft cylinder 10, a tip shaft 20, a liquid ink 25, a porous body member 30, a holding body 40, and a pen tip (pen core) serving as an ink tank. ) 50 is provided.

The shaft cylinder 10 has a larger diameter than the shaft cylinder of the first embodiment, and the tip shaft 20 is fixed to the tip opening on the pen tip side by fitting.
The toe shaft 20 has a porous member 30 in the front portion on the pen tip side, a small-diameter front cylindrical portion 24a for holding the holding body 40 inside, an inclined intermediate portion 24b in the middle, and a rear side. It has a large-diameter rear cylindrical portion 24c, and the outer periphery of the rear tubular portion 24c is configured such that the tip opening of the shaft cylinder 10 is fixed by fitting. A fitting rib 24d is formed on the inner circumference of the rear tubular portion 24c to hold the porous member 30.
Further, a lid portion 26 for closing the rear end opening of the rear tubular portion 24c is attached, an ink outflow hole 27 is formed in the central portion of the lid portion 26, and liquid ink directly stored in the shaft cylinder 10 is provided. The structure is such that 25 passes through the ink outflow hole 27. In the ink outflow hole 27, the ink tank side has a slightly larger hole diameter in order to improve the discharge property of the liquid ink.
The toe shaft 20 and the lid portion 26 having these structures are formed of, for example, a resin made of PP or the like.

The porous member 30 exhibits the same function as that of the first embodiment, and has a high-density portion 31 having a high capillary force in the central portion in the longitudinal direction and a high-density portion in the outer peripheral portion of the high-density portion 31. It is provided with a low density portion 32 having a lower capillary force than 31.
In the present embodiment, the rear end surface side, which is one end of the high-density portion 31 of the porous body member 30, becomes a high-order high-density portion 34 due to the compressed portion that is further compressed to further increase the capillary force, and the outflow property of the liquid ink 25. Is even better.
The porous body member 30 is filled (accommodated) in the rear cylindrical portion 24c of the front shaft 20, the rear end surface of the porous body member 30 is in close contact with the rear end surface of the lid portion 26, and the porous body is in the ink outflow hole 27. The rear end surface, which is one end of the high-density portion 31 of the member 30, is in contact with each other. Also in this embodiment, the area of the rear end surface of the high-density portion 31 is larger than the area of the ink outflow hole 27, and the structure is such that the ink can flow out from the ink outflow hole 27 satisfactorily by the capillary force.
The porous member 30 filled in the rear tubular portion 24c has a structure in which the tubular holding body 40 is held in the front tubular portion 24a by attaching the tubular holding body 40 in the front tubular portion 24a. It has become. A thick pen tip (pen core) 50 is held in the holding body 40 by fitting, and the rear end surface of the pen tip 50 comes into contact with the front end surface which is the other end of the high-density portion 31 of the porous body member 30. It has a configuration (reference numeral 33 in the figure).

In the writing tool B configured as described above, the liquid ink 25 directly housed in the ink tank 10 is moved to the high-density portion 31 of the porous body member 30 and the pen core 50 via the ink outflow hole 27 by capillary force. The structure is such that the outflow is good in sequence. Further, even when the ink supply from the shaft cylinder 10 serving as the ink tank to the high density portion 31 via the ink outflow hole 27 is insufficient due to an upward state of the pen tip or a change in the ink tank internal pressure, the low density portion 32 is impregnated. Since the liquid ink can be supplied to the pen tip 50 via the high-density portion 31, writing becomes possible. In the writing tool B of this embodiment, the air entering the shaft cylinder 10 from the pen tip 50 has the same structure as that of FIG. 2, that is, a plurality of air formed on the inner surface from the front portion of the tip shaft 20 to the ink outflow hole 27. It passes through the gap between the ribs (not shown) and the porous body member 30, passes through the porous body member 30 once, reaches the ink outflow hole 27, and is replaced with the liquid ink 25. Further, even in this writing tool B, even if the distance between the air replacement part and the pen tip (pen core) is long, ink can be reliably supplied to the pen tip, and since it is a direct liquid type, the flow rate is high. It is stable, does not fade, the remaining amount is easy to read, it can be written upward even with a direct liquid type, it can be combined with various pen tips, and it does not require a pipe etc. for ink supply, so ink supply It is possible to obtain a direct liquid type writing tool that has many merits such as a simple mechanism and easy design of an ultra-fine shaft and a thick shaft.

5 to 7 show a third embodiment of the writing instrument of the present invention, FIGS. 5 (a) are plan views, (b) are central vertical sectional views, and FIGS. 6 (a) to 6 (e) are views. , It is each drawing which shows the writing part (state which attached the writing core to the holding body) in the writing instrument of FIG. FIG. 7 is a state diagram showing ink replacement of the writing tool C of the third embodiment shown in FIG.
As shown in FIGS. 5A and 5B, the writing tool C of the third embodiment has an in-tank shaft cylinder 10, an outer cylinder 15, a toe shaft 20, a liquid ink 25, a porous body member 30, and a pen. It has a tip (writing part: pen core) 55 and a holding body 60.

The shaft cylinder 10, the toe shaft 20, and the porous member 30 of the third embodiment have the same configuration and function as those of the first embodiment, and the toe shaft 20 containing the shaft cylinder 10 and the porous body member 30 has the same configuration and function. Further, the structure is such that the outer cylinder 15 is fixed by fitting.
The porous body member 30 exhibits the same functions as those of the first embodiment, and has a high-density portion 31 having a high capillary force in the central portion in the longitudinal direction and a high-density portion 31 in the outer peripheral portion of the high-density portion 31. The pen tip (pen core) 55, which will be described later, is provided with a low density portion 32 having a lower capillary force than the density portion 31, and the rear ends of the two ink guiding portions are inserted into the high density portion 31 by piercing or the like. Therefore, the area (volume) of the high-density portion 31 is larger than that of the low-density portion 32.

As shown in FIGS. 6A to 6E, the pen tip 55 has a circular cross section and a substantially U-shaped cross section as a whole, and the ink guiding portions 56, 56 and the ink guiding portions thereof. It is provided with a writing unit 57 for deriving ink from 56 and 56.
The pen tip 55 is made of a porous body, and examples thereof include those made of a porous body having pores, specifically, a sponge body, a sintered body, a fiber bundle body, and a foam body. , Corpus cavernosum, felt body, porous body and the like. Examples of the material for forming the porous body include natural fiber, animal hair fiber, polyacetal resin, polyethylene resin, acrylic resin, polyester resin, polyamide d resin, polyurethane resin, polyolefin resin, and polyvinyl resin. , Polycarbonate resin, polyether resin, polyphenylene resin and the like can be used. In this embodiment, it is composed of a sintered body obtained by sintering various plastic powders and the like.

As shown in FIGS. 6A to 6E, the holding body 60 is fixed to the tip opening of the outer cylinder 15 by fixing the writing core 55, and is a bulging main body 61. A flange portion 62 and a visible portion 63 capable of visually recognizing the writing direction are provided on the front side of the main body portion 61, and the tip end side (end surface) of the pen tip 55 is held on the tip end side of the visible portion 63. It has front holding portions 64a and 64b.
Further, on the rear side of the main body portion 61, a rear holding portion 66 having a holding piece 65 connected to the main body portion 61 is provided. A holding groove 67 for fitting and holding the U-shaped writing core 55 is formed on the entire longitudinal outer peripheral surface of the holding body 60 composed of these members. Further, a concave fitting portion 61a is formed on the outer peripheral surface in the width direction of the main body 61, and a linear air flow groove 61b and a bent air flow are formed in the double-sided air flow groove serving as the outer peripheral surface in the longitudinal direction, respectively. A groove 61c is formed.

The entire holding body 60 configured in this way is made of a hard material, for example, a hard material having visibility, for example, metal, glass, a resin having no rubber elasticity, and the like. Examples of the resin having no visible rubber elasticity include PP, PE, PET, PEN, nylon (including amorphous nylon in addition to general nylon such as 6 nylon and 12 nylon), acrylic, and poly. By molding the material such as methylpentene, polystyrene, and ABS having a visible light transmittance of 50% or more, the characters written in the writing direction can be effectively visually recognized by the visible portion 63. In addition, only the visible portion 63 may be made of a material having visibility. The visible light transmittance can be obtained by measuring the reflectance with a multi-light source spectrocolorimeter [manufactured by Suga Test Instruments Co., Ltd. (MSC-5N)].
Further, the holding body 60 may be configured by using one kind of each of the above materials, or two or more kinds of materials from the viewpoint of further improvement of durability and visibility, injection molding, blow molding and the like. It can be molded by various molding methods.

In this writing tool C, the pen tip 55 is fixed (mounted) to the holding body by fitting the ink guiding portions 56, 56 of the pen tip into the holding groove 67, and having the front holding portions 64a, 64b and the holding piece 65. The pen tip 55 is fixed by holding with the rear holding portion 66. Further, in order to ensure that the pen tip 55 is fixed (prevented from coming off), adhesion or welding with an adhesive may be further used. Further, even if a wedge-shaped non-smooth surface portion is formed in the contact surface portion of the holding groove 67 of the holding body 60 that comes into contact with the writing portion 57 of the pen tip 55, the pen tip 55 is further secured to the holding body 60. It's a good one.

By fitting the holding body 60 (FIG. 6) to which the pen tip 55 having the above configuration is fixed into the opening at the tip of the outer cylinder 15, the pen tip 55 is fixed to the outer cylinder 15 via the holding body 60. , The rear end portions 56a, 56a of the ink guiding portions 56, 56 of the pen tip 55 are configured to enter into the high-density portion 31 of the porous body member 30. It should be noted that a recess may be formed inside the tip side of the high-density portion 31 to insert the rear end portions 56a, 56a of the ink guiding portions 56, 56. Further, when the pressure in the barrel 10 increases, ink dripping or the like may occur from the pen tip, but in the writing tool C of the present embodiment, as shown in FIG. 4, the air flow grooves 61b, 61c The inside of the barrel 10 and the outside air are adjusted via the above.
In the writing tool C of this embodiment, the air entering the shaft cylinder 10 from the pen tip 55 through the air flow grooves 61b and 61c has the same structure as that of FIG. 2, that is, from the front portion of the tip shaft 20 to the ink outflow hole 23. It passes through the gaps between the plurality of ribs (not shown) formed on the inner surface by hanging and the porous body member 30, passes through the porous body member 30 once, and then reaches the ink outflow hole 23, and is replaced with the liquid ink 25. To.

In the writing tool C configured as described above, the liquid ink 25 directly housed in the ink tank 10 is capillaryd to the ink outflow hole 23, the high-density portion 31 of the porous member 30, and the writing portion 57 of the pen tip 55. It is configured to flow out satisfactorily by force.
Even in this writing tool C, even when the ink supply from the shaft cylinder 10 serving as the ink tank to the high-density portion 31 via the ink outflow hole 23 is insufficient due to an upward state of the pen tip or a change in the ink tank internal pressure, the ink density is low. Since the liquid ink impregnated in the portion 32 can be supplied, writing becomes possible, and even if the distance between the vicinity of the ink outflow hole 23 serving as the air replacement portion and the pen tip (pen core) 50 is long, the ink is reliably supplied to the pen tip 50. In addition, because it is a direct liquid type, the flow rate is stable, it does not fade, the remaining amount is easy to read, it can be combined with various pen tips, and it is a pipe for ink supply. Since the ink supply mechanism becomes simple and the design of the ultra-fine shaft and the thick shaft becomes easy, a direct liquid type writing tool can be obtained.

Further, in the writing tool C of this embodiment, as described above, the holding body 60 to which the pen tip 55 is fixed is made of a material having visibility, so that the visible portion 63 of the holding body 60 indicates the writing direction. It is a visible part that can be visually recognized, and it is possible to provide sufficient visibility to reliably read characters written in the writing direction, and to provide a writing tool that can be used until the end of writing. ..

Further, in the writing tool C of this embodiment, the above-mentioned shaft cylinder 10, tip shaft 20, and porous member 30 serve as ink replacement cartridges, and the liquid ink 25 is housed in the shaft cylinder 10 and the pen tip. The toe shaft 20 and the porous member 30 are fixed to the side, and the opening portion of the tongue shaft 20 on the pen tip side is sealed with a lid member (cap member, not shown).

When replacing this cartridge, the lid member is removed, and as shown in FIGS. 7A and 7B, the pen tip 55 is fitted to the opening of the tip of the outer cylinder 15 to the main body. Then, the ink replacement cartridge is inserted through the rear end opening 16 of the outer cylinder 15, and as shown in FIGS. 5A and 5B, the ink replacement cartridges are inserted into the rear end portions 56a and 56a of the ink guiding portions 56 and 56. By making the structure so as to penetrate into the high-density portion 31 of the porous body member 30, it is possible to exhibit the same structure as that of the third embodiment and various functions and effects.

8A and 8B show a fourth embodiment of the writing instrument of the present invention, FIG. 8A is a plan view, and FIG. 8B is a central vertical sectional view.
The writing tool D of the fourth embodiment is the same as that of the first embodiment only in that the stirring rod 80 is provided in the shaft cylinder 10 of the writing tool A of the first embodiment and the convex portion 11 is provided on the outer periphery of the shaft cylinder 10. It is different from the writing tool A.
The writing tool D of the fourth embodiment is provided with the stirring rod 80 so that it can be suitably used even if a concealing ink containing titanium oxide or the like is used.

The writing instrument of the present invention is not limited to the above-described embodiment and can be variously modified without changing the technical idea of the present invention.
In the first and second embodiments, the pen tip 50 is made of a thin or thick fiber core, and in the third embodiment, it is made of a sintered body obtained by sintering plastic powder or the like. A plastic core having an ink groove formed in the axial direction may be used. In the case of the plastic core, since it easily sticks into the high-density portion 31 of the porous body member 30, it can be brought closer to the ink outflow hole 23, and a pen of liquid ink can be used. Better distribution to the destination.

Further, in the writing tools of each of the above embodiments, in order to further improve the discharge property of the liquid ink 25 from the shaft cylinder 10 constituting the ink tank, the inner wall of the ink tank is subjected to surface treatment such as water repellent treatment or oil repellent treatment. It is preferable that the ink is used. When a water-based ink is used as the liquid ink, a water-repellent treatment or the like can be applied, and when an oil-based ink is used, an oil-repellent treatment or the like can be applied.
In the water-repellent treatment, a water-repellent coating agent consisting of silicone oil, a fluororesin, an acrylic tree or an amide resin can be coated, and in the oil-repellent treatment, a silicone resin, a fluororesin, a silicone-modified acrylic resin, etc. The oil-repellent coating agent and the like can be coated, and the coating method includes, for example, a dry method such as a vacuum vapor deposition method, a sputtering method, and a CVD method, as well as a dip method, a spray method, a spin coating method, a brush coating, and a die coating. Any of the representative wet methods can be used.

Further, in each of the above embodiments, the liquid ink for writing tools has been described, but a liquid such as a liquid cosmetic, a liquid drug, a coating liquid, and a correction fluid is used, and the pen tip is combined with the liquid, for example, FIG. -It may be used as a coating member having the structure used in FIG. Further, the writing tool of the present invention is provided with a sign pen, an underline pen, a paint marker, an oil-based marker, a water-based marker, a writing tool for a writing board such as a white board or a black board, and a ballpoint pen tip as a pen tip, and has a rear end portion. Can also be used as a water-based or oil-based ballpoint pen by replacing the pen tip of a type that can supply ink by contacting a high-density portion of a porous body member.

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 conforming to the following configuration and FIG. 1, and the following liquid ink were used. The dimensions of the pen tip, porous member, etc. used were those shown below.

(Structure of Porous Member 30)
Overall diameter φ: 6 mm, high density part 31: diameter φ; 2 mm,
Composition of high-density portion 31: 15 denier fiber made by PET was used.
Structure of low density part 32: 30 denier fiber made of PET was used.
When the capillary force of the high-density portion 31 was 1, the capillary force of the low-density portion 32 was 0.66.
(Structure of pen tip 50)
PET fiber core, porosity 50%, diameter φ2 mm, length 18 mm
(Structure of writing tool members other than the porous member 30 and the pen tip 50)
Shaft cylinder (ink tank) 10, toe shaft 20, joint 35, holder 40: all made of polypropylene (PP), shaft cylinder 10: diameter 7 mm, rear tubular part 22 of toe shaft 20: maximum inner diameter: φ6 mm, ink outflow Hole 23: Diameter φ1.3 mm, length 1 mm

(Ink composition)
As the ink, ink having the following composition (total 100% by mass) was used.
Moisturizer: Trimethylglycine (glycine betaine) 7.5% by mass
Pentaerythritol 4.5% by mass
Colorant: NKW-4805 Yellow (manufactured by Nippon Fluorescent Co., Ltd.) 40.0% by mass
Preservative: Bio Ace (manufactured by Keiai Kasei Co., Ltd.) 0.3% by mass
pH regulator: triethanolamine 1.0% by mass
Fluorosurfactant: Surflon 8111N (manufactured by AGC Seimi Chemical Co., Ltd.) 0.2% by mass
Water-soluble organic solvent: Ethylene glycol 3.0% by mass
Water (solvent): Ion-exchanged water 43.5% by mass

When writing was performed on a paper surface using the writing tool of Example 1, ink could be reliably supplied to the pen tip 50, the flow rate was stable, writing could be performed without fading, and the remaining amount of ink was also decipherable. It is easy, you can write reliably even if you face it upward, you can combine it with various pen tips, and since you do not need a pipe etc. for ink supply, the ink supply mechanism is simple and it is easy to design an ultra-fine shaft. It was confirmed that a direct-liquid type writing tool with many merits such as

[Example 2]
A writing tool based on the following configuration, FIGS. 5 and 6, and the ink of Example 1 above were used. The dimensions of the porous member 30, the pen tip 55, the holding body 60, and the like were as shown below.

(Structure of Porous Member 30)
Overall diameter φ: 7 mm, high density part 31: diameter φ; 4 mm,
Composition of high-density portion 31: 15 denier fiber made by PET was used.
Structure of low density part 32: 30 denier fiber made of PET was used.
When the capillary force of the high-density portion 31 was 1, the capillary force of the low-density portion 32 was 0.66.
(Structure of pen tip 55)
PE sintered core, porosity 60%, writing part 57: line width 4 mm, ink guiding part: φ1.6 mm
(Structure of holder 60)
Made of acrylic resin, visible light transmittance 85% [Reflectance was measured with a multi-light source spectrophotometer (MSC-5N) manufactured by Suga Test Instruments Co., Ltd., and used as the visible light transmittance. ]
Size of visible part 63 (square) after attaching the writing core: 5 mm x 6 mm x 3 mm x 4 mm
(Structure of writing tool members other than the porous member 30, the holding body 40, and the pen tip 50)
Shaft cylinder (ink tank) 10, outer cylinder 15, toe shaft 20: all made of polypropylene (PP), shaft cylinder 10: diameter φ12 mm, rear tubular part 22 of toe shaft 20: maximum inner diameter: φ8 mm, ink outflow hole 23: Diameter φ1.3mm, length 1mm
(Ink composition) The ink of Example 1 was used.

When writing on the characters on the paper using the writing tool of the underline marker of the second embodiment, the ink can be reliably supplied to the pen tip 50, the flow rate is stable, and the writing (mark) can be performed without fading. Moreover, the remaining amount of ink is easy to read, it can be written reliably even when facing upward, it can be combined with various pen tips, and since a pipe for ink supply is not required, the ink supply mechanism is It was confirmed that a direct liquid type writing tool can be obtained, which has many merits such as simplicity and easy design of an ultra-fine shaft.
Further, when writing was performed on the characters using the writing instrument of the second embodiment, the appearance on the other side was visually confirmed through the visible part at the time of writing. As a result, the visibility was sufficient, and the writing was easy to see. I was able to write while reading the letters written in the direction.

The writing tool of the present invention can be suitably used for felt-tip pens, underline pens, oil-based markers, water-based markers, writing board markers such as whiteboard markers and blackboard markers, water-based and oil-based ballpoint pens, and the like.

A Writing tool 10 Shaft cylinder (ink tank)
20 Tip shaft 30 Porous member 31 High-density part 32 Low-density part 40 Holder 50 Pen tip (pen core)

Claims (1)

It is provided with at least a pen tip, an ink tank for directly accommodating ink, at least one ink outflow hole provided on the pen tip side of the ink tank, and a porous member having a high-density portion.
One end of the high-density portion of the porous body member is in contact with the ink outflow hole, the other end of the high-density portion is in contact with the pen tip, and the vicinity of the ink outflow hole of the porous body member has a high-order high-density portion. A writing tool characterized by that.

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