JP2018122566A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably supply ink to a pen tip even if the distance between an air replacement portion and a pen tip (pen core) is long, and since the number of parts is small, the ink supply mechanism is simplified and the axis is thinned. Provided is a direct liquid type writing tool having merits such as enabling. SOLUTION: A porosity having a pen tip 50, an ink tank 10 for directly accommodating ink 25, at least one ink outflow hole 23 provided on the pen tip side of the ink tank 10, and a high-density portion 31. A writing instrument including at least a body member 30, wherein one end of a high-density portion 31 of the porous body member 30 is in contact with the ink outflow hole 23, and the other end of the high-density portion 31 is in contact with a pen tip 50. A. [Selection diagram] Fig. 1

Description

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

2. Description of the Related Art Conventionally, direct liquid writing instruments of a type in which ink is directly stored in an ink tank are known in a variety of structures.
For example, 1) A casing made of an elastic material of polyethylene synthetic resin having a collar and a small hole is fitted to the head of the shaft cylinder that stores liquid ink as it is, and the shaft cylinder end is inserted into a cotton-like felt filled therein. The structure of a felt fountain pen formed by inserting the tail end of a felt pen penetrating the shaft neck of the shaft neck cap 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 type writing instrument provided with a partition wall provided with a communication hole between the ink storage body and the ink tank to communicate between the ink storage body and the ink tank. A direct liquid writing instrument (for example, a patent) characterized in that a rod-shaped ink guide member for supplying ink to the tip is inserted and a reduced diameter portion for enhancing capillary force is provided at the rear end portion of the ink occlusion body. Reference 2), 3) In a liquid applicator having an ink reservoir member (so-called collector member) that temporarily stores overflow ink in response to a change in pressure in the tank, the shaft tube has an end opposite to the side where the ink reservoir member is disposed. A partition wall is provided at a position close to the center portion, and the space inside the shaft cylinder between the rear end of the ink reservoir member and the partition wall is used as an ink tank, and the position around the partition wall on the outer surface of the shaft tube portion is made opaque. A liquid applicator characterized by this (for example, see Patent Document 3) is known.

However, in the writing instrument disclosed in Patent Document 1, the ink is supplied by sequentially infiltrating the felt pen from the small hole through the felt, but when the distance from the small hole to the felt pen is long, Ink supply to the felt pen that becomes the nib is interrupted or defective, and since it is necessary to form a gap between two parts, it is difficult to adjust the stable interval. There is a problem that it is difficult to achieve both compatibility and ink dripping.
In the writing instrument disclosed in Patent Document 2, the tip of the ink guide member is a pen core (writing part), the ink guide member has a uniform capillary force, and the ink is the rear part of the ink guide member. Is supplied to the ink guide member through the pointed member fixed to the ink guide member, but when the distance from the pointed member to the pen core (writing part) which is the tip of the ink guide member is long (far), Similar to Patent Document 1, there is a problem in that the ink is not smoothly supplied to the pen core (writing unit) that 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 technical idea (configuration and operational effects) different from the present invention.

  On the other hand, as a writing instrument in which a batting (ink occlusion body or core) filled with ink is accommodated in the shaft cylinder and one end of a pen tip is brought into contact with the batting, for example, 1) The batting is constituted by using a crimped fiber. And the central portion has a fiber thickness of 1.5 to 4 denier, the peripheral portion has a fiber thickness of 1.5 to 3 times that of the central portion, and the occupied sectional area of the central portion has a leading end. The core of the writing felt pen, which is characterized by not being smaller than the cross-sectional area of the base part (see, for example, Patent Document 4), 2) the shaft cylinder, and between the fine fiber and the fiber compared to the fine fiber A writing instrument comprising: a large-diameter fiber having a large gap; and a batting housed in the shaft tube, and a pen tip that has one end in contact with the batting and the other end exposed from the shaft tube. The brush is characterized in that the large-diameter fiber accounts for 5 to 30% of the entire batting. Ingredients (e.g., see Patent Document 5) it is known.

  The above-mentioned Patent Documents 4 and 5 are not so-called direct liquid-type writing instruments that contain ink directly in an ink tank, but are so-called batting-type writing instruments, and the present invention includes the problems, technical ideas (configurations and operational effects thereof) of the invention. ) Is different.

Japanese Utility Model Publication No. 35-3317 (Registration request, Fig. 2) JP-A-11-301168 (Claims, FIG. 1) JP 2001-113877 A (Claims, FIG. 1) JP-A-53-104318 (Claims, FIGS. 1 and 2) Japanese Patent Laying-Open No. 2015-120257 (Claims, FIG. 3)

  In view of the above-described conventional problems, the present invention is to solve this problem, and reliably supplies ink to the pen tip even when the distance between the air replacement unit and the pen tip (pen core) is long. It is an object of the present invention to provide a direct liquid-type writing instrument having advantages such as that an ink supply mechanism is simplified and a thin shaft can be realized because a pipe for supplying ink is not necessary.

  As a result of diligent studies to solve the above-described conventional problems, the present inventor has found that a pen tip, an ink tank that directly stores ink, and at least one ink provided on the pen tip side of the ink tank It has been found that the above-mentioned writing instrument 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 instrument of the present invention is a porous member having a pen tip, an ink tank that directly stores ink, at least one ink outflow hole provided on the pen tip side of the ink tank, and a high-density portion. At least one end of the 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 fine fiber diameter at the center of the porous member as compared with the outer peripheral portion.
It is preferable that the vicinity of the ink outflow hole of the porous member has a compression portion.

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

An example of embodiment of the writing instrument of this invention is shown, (a) is a top view, (b) is a center longitudinal cross-sectional view. FIG. 2 is a partial cross-sectional perspective view showing a state where a porous body member is removed in the writing instrument of FIG. 1. The other examples of embodiment of the writing instrument of this invention are shown, (a) is a top view, (b) is a center longitudinal cross-sectional view. FIG. 4 is a partial cross-sectional perspective view showing a state where a porous body member is removed in the writing instrument of FIG. 3. The other examples of embodiment of the writing instrument of this invention are shown, (a) is a top view, (b) is a center longitudinal cross-sectional view. (A)-(e) is each drawing which shows the pen tip (state which attached the writing core to the holding body) in the writing instrument of FIG. 5, (a) is a front view, (b) is the center of (a). (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 rear side. FIGS. 6A and 6B show ink replacement of the writing instrument of the embodiment shown in FIG. 5. FIG. 5A is a plan view and FIG. 5B is a central longitudinal sectional view. The other examples of embodiment of the writing instrument of this invention are shown, (a) is a top view, (b) is a center longitudinal cross-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. 1 (a) is a plan view, (b) is a central longitudinal sectional view, and FIG. 2 is a writing instrument of FIG. It is a fragmentary sectional perspective view which shows the state which removed the porous body member.
As shown in FIGS. 1 (a) and 1 (b), the writing instrument A of the first embodiment includes a shaft cylinder 10 that becomes an in-tank, a front shaft 20, liquid ink 25, a porous body member 30, a joint 35, and a holding body. 40 and a nib (writing part: pen core) 50 are provided.

The shaft cylinder 10 is formed in a bottomed cylinder shape using, for example, a thermoplastic resin, a thermosetting resin, or the like, and directly stores liquid ink as shown in FIG. It constitutes a tank.
The shaft tube 10 is formed to be opaque or transparent (and translucent) as a whole or a part thereof, but any of them may be adopted from the viewpoint of appearance and practical use. In the present embodiment, in order to make the remaining amount easy to read, the ink storage location of the shaft tube 10 is visible.

The front shaft 20 has a front cylindrical portion 21 for holding the porous body member 30, the joint 35, and the like in the front portion on the pen tip side, and a rear cylindrical portion 22 on the rear side. The outer periphery of the cylindrical portion 22 is configured such that the tip opening of the shaft tube 10 is fixed by fitting.
Further, the inside of the rear cylindrical portion 22 is tapered to the front cylindrical portion 21 side, and a small-diameter ink outflow hole 23 is formed in the central portion, communicated with the front cylindrical portion 21, and the shaft The liquid ink 25 stored directly in the cylinder 10 passes through the ink outflow hole 23.
The front shaft 20 having this structure is formed of, for example, a resin made of PP or the like.
As shown in FIG. 2, the air that enters 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 between a plurality of ribs 24, 24. The ink passes through the gap between the members 30, passes through the porous member 30 once, reaches the ink outflow hole 23, and is replaced with the liquid ink 25.

Examples of the liquid ink 25 stored directly in the shaft cylinder 10 serving as an in-tank include water-based ink and oil-based ink. Preferably, the measurement value of the viscosity at a shear rate of 191.5 (S ⁻¹ ) of a cone-plate viscometer (ELD type rotational viscometer) at 25 ° C. using water-based ink or oil-based ink is 2 to 30 (mPa · s). A relatively low viscosity ink of s) is preferred. The ink composition to be used includes pigments (including resin pigments), coloring agents such as dyes, main solvents, resins, thickeners, and the like depending on the application (water-based ink, oil-based ink), writing instrument type (marking pen, ballpoint pen, etc.) Arbitrary components contained in the ink for writing instruments can be used.
As optional components, for example, rust preventives, antifungal agents, surfactants, lubricants, wetting agents and the like that can be compatible without adversely affecting the ink can be contained. In ballpoint pen inks, fatty acids and the like can be suitably used as lubricants. Further, as a drying inhibiting additive, a non-volatile solvent that is compatible with the main solvent may be contained within a range that does not adversely affect the product characteristics.

The porous member 30 has a columnar body as a whole, and has a high density portion 31 with a high capillary force at the center in the longitudinal direction and a lower capillary force than the high density portion 31 at the outer periphery of the high density portion 31. The low density part 32 is provided. The high-density part 31 and the low-density part 32 have different capillary forces by different fiber density, fiber fineness, porosity and the like (capillary force: high-density part 31> low-density part 32). For example, the material, molding method, production method and the like are not particularly limited. For example, natural fiber, animal hair fiber, polyacetal resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, polyolefin resin, Fibers, fiber bundles, felts, etc. composed of one or a combination of two or more of polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc., and porous materials such as sponges, resin particles, sintered bodies, etc. In the case of using the above-described fibers or the like, for example, a high-density part 3 using a thin fiber diameter (thin fiber) It is formed and it is possible to form the low-density portion 32 with Said sub had thicker fiber diameter than the fiber diameter (large diameter fiber).
In this type of porous body 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 member. And the said porous body member bundles the said small diameter fiber and the said large diameter fiber in a cylinder shape, and is wrapped with a wound film. At this time, the wound film includes a method of wrapping the porous member with a film of resin or the like, a method of coating the outer peripheral portion of the porous member, and the like.
The high-density part 31 and the low-density part 32 are integrally formed using the above-mentioned materials (the same material or different materials), or are formed separately (in two members). The low density portion 32 can be integrated by fitting, welding, sewing, or the like.
If the overall shape of the porous body member 30 is a columnar body, the outer peripheral shape thereof is not particularly limited, such as a columnar shape, an elliptical columnar shape, or a rectangular columnar shape. In this embodiment, it is comprised from the column shape.
Moreover, the high density part 31 does not need to exist in the center part, and it is sufficient if it is formed in the low density part 32 at least at one place.

As a 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 direct current resistance. 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 sag. On the other hand, 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 example, when the material of the porous member 30 is composed of the fiber, the capillary forces M1 and M2 within the above range are adjusted using a high-density portion 31 and a low-density portion 32 using a thin fiber diameter and a thick fiber diameter. If the material of the porous member 30 is made of a material such as a porous material such as sponge, resin particles, or sintered body, it can be composed of a material having a high porosity and a material having a low porosity.
In the present invention, the capillary force is a force that raises the liquid ink, and a silicone tube is put in a container containing ink, and one of the objects to be measured (ink occlusion body, relay core, nib) And fill the tube with ink. At this time, the measurement object is filled with ink, and the ink is filled up to the upper end of the measurement object. Next, the lower end of the measurement object is gradually raised. At this time, a meniscus is generated at the upper end of the measurement object, and the ink column is held by the capillary force of the measurement object. The distance (x) between the lower end of the measurement object and the liquid level can be obtained by comparing the heights of the ink columns supported by the measurement object.

  The porous member 30 having the above structure is filled (accommodated) in the front cylindrical 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 cylindrical portion 21, A rear end surface which is one end of the high density portion 31 of the porous 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 holes 23, so that the ink can be satisfactorily discharged from the ink outflow holes 23 by capillary force.

Depending on the structure of the nib 50, the viscosity of the ink type, the capillary force of the high-density portion 31, the hole diameter area S1 (= contact area) of the ink outflow hole 23 and the area S2 of the high-density portion 31 vary. From the viewpoint of improving leakage, 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 attaching a tubular joint 35 by fitting into the front tubular portion 21. It has a structure. In the joint 35 attached in the front cylindrical part 21, a holding body 40 is attached by fitting, and in addition, a writing part 50 is held in the holding body 40 by fitting, and a pen tip (pen The rear end surface of the core 50 is in contact with the front end surface that is the other end of the high-density portion 31 of the porous member 30 (reference numeral 33).

  The nib 50 is not particularly limited in material, shape, structure, manufacturing method, and the like. For example, the nib 50 is composed of one or more combinations of natural fiber, animal hair fiber, synthetic resin (plastic), and the like. Fused fiber bundles such as felt, processed fiber bundles such as felt, or resin cores of these fiber bundles, plastic cores with ink grooves formed in the axial direction of the various plastic materials, and the various plastic powders. The porous body, the brush body, and the like can be used, and the form thereof is arbitrary such as a plate-like body, a fiber bundling body, a sintered body, and a foamed body, and any combination with the porous body member 30 is possible. The nib (pen nib) 50 of this embodiment is composed of a fiber core with a thin tip.

  In the writing instrument A of the present embodiment, the writing instrument ink is accommodated in the shaft cylinder 10 serving as the ink tank of the writing instrument, and the porous member 30, the joint 35, the holding body 40, and the writing unit (pen) serving as the pen tip are stored in the front shaft 20. The writing instrument A can be easily produced by fixing the core 50 attached to the opening of the shaft tube 10 by fitting or the like.

In the writing instrument A configured as described above, the liquid ink 25 stored directly in the ink tank 10 passes through the ink outflow holes 23, and the high density portion 31 and the writing portion (pen core) 50 of the porous body member 30. It is configured to gradually flow out smoothly by capillary force. Further, when the ink supply from the shaft cylinder 10 serving as an ink tank, such as a pen tip upward body or a change in the ink tank internal pressure, to the high density portion 31 through the ink outflow hole 23 is not sufficient, the low density portion 32 is also provided. Since the impregnated liquid ink can be supplied to the pen tip 50 through the high density portion 31, writing is possible.
In this writing instrument 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 an air replacement portion and the pen tip (pen core) 50 is long. Therefore, the flow rate is stable, it does not fade, the remaining amount is easy to read, even with direct liquid type, it can be written upwards, it can be combined with various pen tips, and pipes for ink supply etc. are unnecessary Therefore, the ink supply mechanism becomes simple, and a direct liquid writing instrument having a number of merits such as easy design of a very thin shaft and a thick shaft can be obtained.

3 and 4 show a second embodiment of the writing instrument of the present invention, FIG. 3 (a) is a plan view, (b) is a central longitudinal sectional view, and FIG. 4 is a writing instrument of FIG. It is a fragmentary sectional perspective view which shows the state which removed the porous body member.
In the following 2nd-4th embodiment, what has the structure and function similar to the writing instrument A of the said 1st Embodiment shows the same code | symbol in a figure, and abbreviate | omits the description.
As shown in FIGS. 3 and 4, the writing instrument B according to the second embodiment includes a shaft cylinder 10 serving as an ink tank, a tip shaft 20, a liquid ink 25, a porous body member 30, a holding body 40, a pen tip (pen core). ) 50.

The shaft tube 10 has a larger diameter than the shaft tube of the first embodiment, and the tip shaft 20 is fixed to the tip opening portion on the pen tip side by fitting.
The front shaft 20 has a porous member 30 and a small-diameter front cylindrical portion 24a for holding the holding body 40 inside at the front portion on the pen tip side, an inclined intermediate portion 24b in the middle, and a rear side. The rear cylindrical part 24c has a large diameter, and the outer periphery of the rear cylindrical part 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 periphery of the rear cylindrical portion 24c to hold the porous member 30.
Further, a lid portion 26 that closes the rear end opening of the rear cylindrical portion 24c is attached, and an ink outflow hole 27 is formed in the center portion of the lid portion 26, so that the liquid ink stored directly in the shaft cylinder 10 is formed. 25 is configured to pass 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 performance of the liquid ink.
For example, the front shaft 20 and the lid portion 26 having these structures are formed of 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 at the central portion in the longitudinal direction and a high density portion at the outer peripheral portion of the high density portion 31. A low density portion 32 having a capillary force lower than 31 is provided.
In the present embodiment, the rear end face side that is one end of the high density portion 31 of the porous member 30 becomes a high-order high-density portion 34 by the compression portion that is further compressed to further increase the capillary force. Is even better.
The porous member 30 is filled (accommodated) in the rear cylindrical portion 24 c of the front shaft 20, the rear end surface of the porous member 30 is in close contact with the rear end surface of the lid portion 26, and the porous body member is inserted into the ink outflow hole 27. The rear end surface that is one end of the high-density portion 31 of the member 30 is in contact. Also 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 holes 27, so that the ink can be satisfactorily discharged from the ink outflow holes 27 by capillary force.
The porous body member 30 filled in the rear cylindrical portion 24c has a structure in which the cylindrical holder 40 is held in the front cylindrical portion 24a by being attached in the front cylindrical portion 24a. It has become. A thick nib (pen nib) 50 is held in the holding body 40 by fitting, and the rear end surface of the nib 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 writing instrument B configured as described above, the liquid ink 25 stored directly in the ink tank 10 is passed through the ink outflow hole 27 to the high density portion 31 of the porous body member 30 and the pen core 50 by capillary force. It becomes the structure which flows out well sequentially. The low density portion 32 is also impregnated even when the ink supply from the shaft cylinder 10 serving as an ink tank to the high density portion 31 through the ink outflow hole 27 is insufficient due to the pen tip upward state or the change in the ink tank internal pressure. Since the liquid ink thus supplied can be supplied to the pen tip 50 via the high density portion 31, writing is possible. In the writing instrument B of this embodiment, the air that enters the shaft cylinder 10 from the pen tip 50 has a structure similar to that in FIG. 2, that is, a plurality of air that is formed on the inner surface from the front portion of the tip shaft 20 to the ink outlet hole 27. The ink passes through the gap between the ribs (not shown) and the porous member 30, passes through the porous member 30 once, reaches the ink outflow hole 27, and is replaced with the liquid ink 25. Also, in this writing instrument B, even if the distance between the air replacement unit and the pen tip (pen nib) is long, ink can be reliably supplied to the pen tip, and since it is a direct liquid type, the flow rate is Stable, faint, easy to read remaining amount, even direct liquid type can be written upwards, can be combined with various pen tips, and ink supply pipes are not required, so ink supply The mechanism becomes simple, and a direct liquid writing instrument having a number of merits such as easy design of a very thin shaft and a thick shaft can be obtained.

5 to 7 show a third embodiment of the writing instrument of the present invention. FIG. 5 (a) is a plan view, FIG. 5 (b) is a central longitudinal sectional view, and FIGS. 6 (a) to 6 (e) are views. FIG. 6 is a drawing showing a writing part (a state where a writing core is attached to a holding body) in the writing instrument of FIG. 5. FIG. 7 is a state diagram showing ink replacement of the writing instrument C of the third embodiment shown in FIG.
As shown in FIGS. 5 (a) and 5 (b), the writing instrument C of the third embodiment includes a shaft cylinder 10, an outer cylinder 15, a front shaft 20, a liquid ink 25, a porous body member 30, a pen serving as an in-tank. A tip (writing part: pen core) 55 and a holding body 60 are provided.

The shaft cylinder 10, the tip shaft 20, and the porous member 30 of the third embodiment have the same configuration and function as the first embodiment, and the tip shaft 20 that houses the shaft cylinder 10 and the porous body member 30 is Further, the outer cylinder 15 is fixed by fitting.
The porous body member 30 exhibits the same functions as those in the first embodiment, and has a high density portion 31 having a high capillary force at the center in the longitudinal direction and a high density at the outer peripheral portion of the high density portion 31. A low-density part 32 having a capillary force lower than that of the density part 31 is provided, and a pen tip (pen core) 55 described later is inserted into the high-density part 31 by piercing or the like at the rear ends of two ink guiding parts. 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 generally U-shaped cross section, and includes ink guiding portions 56 and 56 and the ink guiding portion. 56 and a writing unit 57 for deriving ink from 56.
The nib 55 is composed of a porous body, and examples thereof include a porous body having pores. Specifically, a sponge body, a sintered body, a fiber bundle body, and a foam body are mentioned. , Sponge bodies, felt bodies, porous bodies, and the like. Examples of the material for forming the porous body include natural fibers, animal hair fibers, polyacetal resins, polyethylene resins, acrylic resins, polyester resins, polyamide d resins, polyurethane resins, polyolefin resins, and polyvinyl resins. Polycarbonate resins, polyether resins, polyphenylene resins, and the like can be used. In this embodiment, it is comprised from the sintered compact which sintered various plastic powders.

As shown in FIGS. 6A to 6E, the holding body 60 fixes the writing core 55 and is fixed to the distal end opening of the outer cylinder 15, and has a bulging main body 61. And a front end side of the pen point 55 on the front end side of the visible portion 63, and a flange portion 62 and a visible portion 63 capable of visually recognizing the writing direction. Forward holding portions 64a and 64b.
In addition, a rear holding part 66 having a holding piece 65 connected to the main body part 61 is provided on the rear side of the main body part 61. A holding groove 67 for fitting and holding the U-shaped writing core 55 is formed on the entire outer circumferential surface in the longitudinal direction of the holding body 60 constituted by these members. Further, a concave fitting portion 61a is formed on the outer circumferential surface in the width direction of the main body 61, and the straight air circulation groove 61b and the bent air circulation are respectively provided in the double-sided air circulation grooves serving as the outer circumferential surface in the longitudinal direction. A groove 61c is formed.

The entire holding body 60 configured as described above is made of a hard material, and is made of, for example, a hard material having visibility, such as a metal, glass, or a resin that does not have rubber elasticity. Examples of the resin having no rubber elasticity that can be visually recognized include PP, PE, PET, PEN, nylon (including amorphous nylon in addition to general nylon such as 6 nylon and 12 nylon), acrylic, poly, and the like. By forming from a material having a visible light transmittance of 50% or more such as methylpentene, polystyrene, ABS, etc., the characters written in the writing direction in the visible portion 63 can be effectively visually recognized. In addition, you may comprise only the visible part 63 with the material which has 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)].
In addition, the holding body 60 may be configured by using one or more kinds of the above materials, or two or more kinds of materials from the viewpoint of further improving durability and visibility, and injection molding, blow molding, etc. It can shape | mold by these various shaping | molding methods.

  In the writing instrument C, the pen tip 55 is fixed (attached) to the holding body by inserting the ink guide portions 56 and 56 of the pen tip into the holding groove 67 and having front holding portions 64 a and 64 b and a holding piece 65. The pen tip 55 is fixed by the holding with the rear holding portion 66. Furthermore, in order to secure the sticking (disengagement prevention) of the pen tip 55, adhesion or welding with an adhesive may be further used. Further, a wedge-shaped non-smooth surface portion is formed on the contact surface portion of the holding groove 67 of the holding body 60 that contacts the writing portion 57 of the pen tip 55 to further ensure that the pen tip 55 is fixed to the holding body 60. It ’s good.

By fitting the holding body 60 (FIG. 6) to which the pen tip 55 having the above structure is fixed into the tip opening 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 56 a and 56 a of the ink guiding portions 56 and 56 of the pen tip 55 are configured to enter the high density portion 31 of the porous member 30. In addition, you may form the recessed part which inserts the back side edge part 56a, 56a of the ink guidance | induction part 56, 56 in the front end side inside of the high-density part 31. FIG. Further, when the pressure in the shaft cylinder 10 increases, ink dripping or the like may occur from the pen tip. However, in the writing instrument C of the present embodiment, as shown in FIG. 4, the air circulation grooves 61b and 61c. The inside of the shaft cylinder 10 and the outside air are adjusted via
In the writing instrument C of this embodiment, the air that enters the shaft cylinder 10 from the pen tip 55 through the air circulation grooves 61b and 61c has the same structure as that in FIG. 2, that is, from the front portion of the tip shaft 20 to the ink outflow hole 23. It passes through the gap between the plurality of ribs (not shown) formed on the inner surface and the porous member 30 and passes through the porous member 30 and reaches the ink outflow hole 23 once, and is replaced with the liquid ink 25. The

In the writing instrument C configured as described above, the liquid ink 25 stored directly in the ink tank 10 is capillaryed 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 well sequentially with force.
This writing instrument C also has a low density even when the ink supply from the shaft cylinder 10 serving as an ink tank to the high density portion 31 through the ink outflow holes 23 is not sufficient, such as a pen tip upward state or a change in the ink tank internal pressure. Since the ink can be supplied with the liquid ink impregnated in the portion 32, writing can be performed, 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, since 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 the pipe for ink supply Therefore, the ink supply mechanism is simplified, and a direct liquid writing instrument having a number of merits such as easy design of a very thin shaft and a thick shaft can be obtained.

  In the writing instrument 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 has a writing direction. It becomes a visual recognition part that can be visually recognized, and can provide sufficient visibility that can reliably read characters written in the writing direction, and a writing instrument that can be used until the final writing is provided. .

  Furthermore, in the writing instrument C of this embodiment, the above-described shaft tube 10, the tip shaft 20, and the porous member 30 are cartridges for ink replacement, and the liquid ink 25 is accommodated in the shaft tube 10, and the pen tip The front shaft 20 and the porous member 30 are fixed on the side, and the opening portion of the front shaft 20 on the pen tip side is sealed with a lid member (cap member, not shown).

  When replacing the cartridge, the lid member is removed, and as shown in FIGS. 7 (a) and 7 (b), the pen tip 55 is fixed to the main body of the outer cylinder 15 by fitting to the tip opening. Then, an ink replacement cartridge is inserted from the rear end opening 16 of the outer cylinder 15, and as shown in FIGS. 5 (a) and 5 (b), the rear ends 56a, 56a of the ink guides 56, 56 are inserted. By adopting a configuration that enters the high-density portion 31 of the porous body member 30, the same configuration as the third embodiment and a number of operational effects can be exhibited.

FIG. 8 shows a fourth embodiment of the writing instrument of the present invention, in which FIG. 8 (a) is a plan view and FIG. 8 (b) is a central longitudinal sectional view.
The writing instrument 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 tube 10 of the writing tool A of the first embodiment and that the projection 11 is provided on the outer periphery of the shaft tube 10. This is different from the writing instrument A.
In the writing instrument D of this 4th Embodiment, it has the form which can be used conveniently even if it uses the ink with concealment including titanium oxide etc. by providing the stirring rod 80. FIG.

The writing instrument of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea of the present invention.
In the first and second embodiments, the nib 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 in which ink grooves are formed in the axial direction may be used. In the case of a plastic core, it is easy to get stuck in the high density portion 31 of the porous body member 30, so that it can be brought close to the ink outflow hole 23, and further a liquid ink pen Distribution to the destination will be better.

In the writing instrument of each of the above embodiments, in order to further improve the discharge performance of the liquid ink 25 from the shaft cylinder 10 constituting the ink tank, the inner wall of the ink tank is subjected to a surface treatment such as a water repellent treatment or an oil repellent treatment. It is preferable that When water-based ink is used as the liquid ink, water-repellent treatment can be performed, and when oil-based ink is used, oil-repellent processing can be performed.
In water repellent treatment, water repellent coating agent made of silicone oil, fluorine resin, acrylic resin or amide resin can be coated. In oil repellent treatment, silicone resin, fluorine resin, silicone modified acrylic resin, etc. The oil repellent coating agent can be coated. Examples of the coating method include dry methods such as vacuum deposition, sputtering, and CVD, as well as dipping, spraying, spin coating, brush coating, and die coating. Any of the representative wet methods can be used.

  Furthermore, in each of the above-described embodiments, the liquid ink for writing instruments has been described. However, a liquid body such as a liquid cosmetic, a liquid medicine, a coating liquid, and a correction liquid is used, and a pen tip is combined with the liquid body, for example, FIG. -You may use as an application | coating member of the structure used in FIG. Further, the writing instrument of the present invention comprises a sign pen, an underline pen, a paint marker, an oil marker, an aqueous marker, a writing instrument for a writing board such as a white board or a black board, and further includes a ballpoint pen tip as a pen tip, However, it can be used as a water-based or oil-based ballpoint pen by replacing it with a pen tip that can supply ink in contact with the high density portion of the porous member.

  Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[Example 1]
A writing instrument conforming to the following configuration and FIG. 1 and the following liquid ink were used. The dimensions of the pen tip, porous member, etc. were as shown below.

(Configuration of porous member 30)
Overall diameter φ: 6 mm, high density portion 31: diameter φ; 2 mm,
Structure of the high-density part 31: 15 denier fibers made of PET were used.
Configuration of the low density portion 32: PET 30 denier fiber was used.
When the capillary force of the high density portion 31 is 1, the capillary force of the low density portion 32 is 0.66.
(Configuration of the nib 50)
PET fiber core, porosity 50%, diameter 2mm, length 18mm
(Configuration of writing instrument member other than porous body member 30 and nib 50)
Shaft cylinder (ink tank) 10, front shaft 20, joint 35, holding body 40: both made of polypropylene (PP), shaft cylinder 10: diameter 7 mm, rear cylindrical portion 22 of front shaft 20: maximum inner diameter: φ6 mm, ink outflow Hole 23: Diameter φ1.3mm, Length 1mm

(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 Fluorescence) 40.0 mass%
Preservative: Bioace (Kai Kasei Co., Ltd.) 0.3% by mass
pH adjuster: 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 on the paper surface using the writing instrument of Example 1, the ink can be reliably supplied to the nib 50, the flow rate is stable, the writing can be performed without fading, and the remaining amount of ink can be read. Easy to write even when facing upward, can be combined with various pen nibs, and pipes for ink supply are not required, simplifying the ink supply mechanism and designing an ultra-thin shaft It was confirmed that a direct liquid type writing instrument having many merits such as

[Example 2]
The following composition and the writing instrument conforming to FIGS. 5 and 6 and the ink of Example 1 were used. The dimensions of the porous body member 30, the nib 55, the holding body 60, etc. were as follows.

(Configuration of porous member 30)
Overall diameter φ: 7 mm, high density part 31: diameter φ; 4 mm,
Structure of the high-density part 31: 15 denier fibers made of PET were used.
Configuration of the low density portion 32: PET 30 denier fiber was used.
When the capillary force of the high density portion 31 is 1, the capillary force of the low density portion 32 is 0.66.
(Configuration of the nib 55)
PE sintered core, porosity 60%, writing part 57: drawn line width 4 mm, ink guiding part: φ1.6 mm
(Configuration of holding body 60)
Made of acrylic resin, visible light transmittance of 85% [manufactured by Suga Test Instruments Co., Ltd., reflectance was measured with a multi-light source spectrocolorimeter (MSC-5N) to obtain visible light transmittance. ]
The size of the visible part 63 (square) after the writing core is attached: 5 mm × 6 mm × 3 mm × 4 mm
(Configuration of writing instrument member other than porous body member 30, holding body 40, and nib 50)
Shaft cylinder (ink tank) 10, outer cylinder 15, front shaft 20: both made of polypropylene (PP), shaft cylinder 10: diameter φ12 mm, rear cylindrical portion 22 of front 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 text on the paper using the underline marker writing instrument of Example 2, ink can be reliably supplied to the pen tip 50, the flow rate is stable, and writing (marking) can be performed without fading. In addition, the remaining amount of ink is easy to read, can be written reliably even when facing upward, can be combined with various pen nibs, and pipes for supplying ink are not necessary, so the ink supply mechanism It was confirmed that a direct liquid type writing instrument having many advantages such as simplification and easy design of extra-fine shafts was obtained.
Moreover, when writing on the character using the writing instrument of this Example 2, when the appearance on the other side was visually confirmed through the visible part at the time of writing, the visibility was sufficient, easy to see, writing I was able to write while reading the letters in the direction.

  The writing instrument of the present invention can be suitably used for sign pens, underline pens, oily markers, aqueous markers, markers for writing boards such as whiteboard markers and blackboard markers, and aqueous and oily ballpoint pens.

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

Claims (3)

  The ink outflow hole comprises at least a pen tip, an ink tank that directly stores 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 part of the porous member is in contact with the other end, and the other end of the high-density part is in contact with the pen tip.   The writing instrument according to claim 1, wherein the central portion of the porous member has a smaller fiber diameter than the outer peripheral portion.   The writing instrument according to claim 1, wherein a vicinity of the ink outflow hole of the porous member has a compression portion.

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