JP6140418B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument suitable for a marking pen or the like having excellent visibility of the remaining amount of ink.

2. Description of the Related Art Conventionally, writing instruments having various structures have been known as writing instruments that can visually recognize the writing direction with a pen tip viewing portion.
For example, there is a writing instrument (for example, see Patent Document 1 by the present applicant) in which an ink guide tube is formed on a holding body having visibility, ink is communicated with the ink guide tube, and ink is supplied to a pen core that is a porous body. Are known.

  However, on the mass production of writing instruments that can visually recognize the writing direction at the visual recognition portion of the pen tip, there may be irregularities on the adhesive surface with the pen core holder, and when the pen core adheres to the holder, Since there is a gap in the adhesive surface between the holder and the porous pen core, the adhesion (sealability) between the holder and the pen core is reduced, and air enters the ink guide tube from the gap between the adhesive surface. However, there is a problem that ink is not sufficiently supplied and writing shading may occur.

WO2011 / 158837 (Claims, drawings, etc.)

  The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to solve this problem, and improves the adhesion between the pen core and the holder in a writing instrument that can visually recognize the writing direction at the visual recognition part of the pen tip. Thus, an object of the present invention is to provide a writing instrument that prevents air from entering the ink guide tube from the adhesive surface and is sufficiently supplied with ink so that there is no writing scraping or ink shortage.

  As a result of intensive studies in order to solve the above-described conventional problems, the present inventor has found that the above-mentioned writing instrument can be obtained by setting the holding body to which the pen core is attached to a specific structure, etc. It has been completed.

That is, the present invention resides in the following (1) and (2).
(1) The pen tip includes a porous body serving as a writing portion, and a holding body that holds the porous body and has at least one ink guiding portion for supplying ink to the writing portion, and is included in the writing instrument body. A writing instrument having a relay porous body for supplying ink to an ink guide provided in the holding body, and the holding body serves as a visual recognition portion for visually confirming the writing direction, the holding body and the porous body A writing instrument, wherein a protrusion is formed on the holding body on the adhesive surface.
(2) The writing instrument according to (1), wherein the protrusion is formed concentrically with the ink guiding portion of the holding body.

  According to the present invention, it is possible to improve the adhesion of the adhesive surface between the pen core and the holding body in the writing instrument whose visual direction can be visually recognized by the visual recognition portion of the pen tip, and the air from the adhesive surface to the ink guide tube Thus, there is provided a writing instrument in which the ink is sufficiently supplied to prevent the ink from penetrating and the ink is sufficiently written and the ink does not run out.

It is drawing of the writing instrument which shows an example of embodiment of this invention, (a) is the longitudinal cross-sectional view, (b) is XX sectional drawing of (a). FIG. 2 is an enlarged partial longitudinal sectional view of FIG. 1. It is drawing which shows an example of the holding body which attaches the porous body used as the writing part of FIG. 1, (a) is a top view, (b) The longitudinal cross-sectional view of planar view, (c) looked at the holding body from the front side. It is a perspective view. (A) is a longitudinal sectional view of the holding body in a front view, (b) is a left side view of the holding body, and (c) is an enlarged partial longitudinal sectional view of an adhesive surface of the holding body. (A)-(g) is drawing which shows each cross-sectional shape of the projection part formed in a holding body. The state which attached the porous body used as a writing part and a relay porous body to a holding body is shown, (a) is a front view, (b) is a perspective view. An example of the writing instrument in a state where the cap body is removed is shown, (a) is a perspective view seen from the front side, and (b) is a perspective view seen from the rear side. It is drawing which shows the other example of the holding body which attaches the porous body used as the writing part of FIG. 1, (a) is a longitudinal cross-sectional view of planar view, (b) is the perspective view which looked at the holding body from the front side. (A) is a longitudinal sectional view of the holding body of FIG. 8 in a front view, (b) is a left side view of the holding body, and (c) is an enlarged partial longitudinal sectional view of an adhesive surface of the holding body. It is drawing which shows the other example of the holding body which attaches the porous body used as the writing part of FIG. 1, (a) is a longitudinal cross-sectional view of planar view, (b) is the perspective view which looked at the holding body from the front side. (A) is a longitudinal sectional view of the holding body in FIG. 10 as viewed from the front, (b) is a left side view of the holding body, and (c) is an enlarged partial longitudinal sectional view of an adhesive surface of the holding body. It is drawing which shows the other example of the holding body which attaches the porous body used as the writing part of FIG. 1, (a) is a longitudinal cross-sectional view of planar view, (b) is the perspective view which looked at the holding body from the front side. (A) is a longitudinal sectional view of the holding body in FIG. 12 as viewed from the front, (b) is a left side view of the holding body, and (c) is an enlarged partial longitudinal sectional view of an adhesive surface of the holding body.

Embodiments of the present invention will be described below in detail with reference to the drawings.
1-7 is each drawing of the writing instrument which shows an example of embodiment of this invention.
The writing instrument A of the present embodiment is a marking pen type writing instrument, and as shown in FIGS. 1 and 2, the shaft cylinder 10 serving as the writing instrument main body (shaft portion), the ink occlusion body 20, the relay porous body 30, and the pen tip. 40 and a cap body 60 are provided.

The shaft tube 10 is formed of, for example, a thermoplastic resin, a thermosetting resin, glass, or the like, and has a bottomed cylindrical rear shaft 11 that houses an ink occlusion body 20 impregnated with ink for writing instruments, and a pen. And a tip shaft 15 to which the tip 40 is fixed.
The rear shaft 11 is formed into a long bottomed elliptical cylinder shape (elliptical shaft) using a synthetic resin made of PP or the like, for example, and functions as a writing instrument body. The rear shaft 11 is provided with a holding member 12 formed of a holding piece for holding the rear end portion of the ink storage body 20 inside the rear end side, and the rear shaft as a whole and the front shaft described later are opaque or transparent (and half-finished). However, any of them may be adopted from the viewpoints of appearance and practical use. Further, the front shaft 15 is fixed to the opening 13 of the rear shaft 11 by fitting or the like.

  The front shaft 15 has an annular fitting portion 16 that is fitted to the opening 13 of the rear shaft 11 on the rear side, and a cylindrical fitting portion 18 that fixes the shoulder portion 17 and the main body portion 42 of the nib 40 on the front side. And a holding member 19 formed of a holding piece for holding the front end portion of the ink occlusion body 20 is provided in the fitting portion 16. The front shaft 15 of this structure is formed of, for example, a synthetic resin made of PP or the like.

The ink occlusion body 20 is impregnated with ink for writing instruments such as water-based ink and oil-based ink. For example, natural fibers, animal hair fibers, polyacetal resins, acrylic resins, polyester resins, polyamide resins, polyurethane resins. Resin, polyolefin-based resin, polyvinyl-based resin, polycarbonate-based resin, polyether-based resin, polyphenylene-based resin or other fiber bundles, processed fiber bundles such as felt, and sponge , Including porous bodies such as resin particles and sintered bodies. The ink occlusion body 20 is accommodated in the main body 11 of the shaft tube 10.
Further, the ink composition to be used is not particularly limited, and in an underline pen or the like, the ink can contain a fluorescent dye, for example, basic violet 11 or basic yellow 40.

  The relay porous body 30 serves as a relay core for supplying the ink of the ink storage body 20 to the ink guiding portion 50 provided on the holding body 55 of the pen tip 40 described later, and is fitted to the front side of the ink storage body 20. It becomes a structure. The relay porous body 30 is a fiber bundle core obtained by processing a fiber bundle such as a fiber bundle or felt, like the ink occlusion body 20, or a resin particle porous body made of a hard sponge, a resin particle sintered body, a sliver core, or the like. In particular, if the ink impregnated in the ink occlusion body 20 can be supplied to the ink guiding part 50 of the holding body 55 via the relay porous body 30, the shape thereof, The structure and the like are not limited. Examples of the cross-sectional shape of the relay core include a circular shape, an elliptical shape, a square shape, a rectangular shape, a trapezoidal shape, a parallelogram shape, a rhombus shape, a kamaboko shape, and a half moon shape.In this embodiment, the cross-sectional shape is a circular shape. It has become.

As shown in FIGS. 2 to 4, the nib 40 includes a porous body 45 serving as a writing portion (pen core), and an ink guiding portion for holding the porous body 45 and supplying ink to the writing portion. 50, and a main body 42 having a cylindrical portion 41 for holding the relay porous body 30 on the rear side. A flange portion 43 is provided on the outer peripheral surface of the main body portion 42, and an insertion holding portion 41 a for inserting and holding the relay porous body 30 is provided at the entrance of the tubular portion 41.
On the outer peripheral surface of the main body portion 42 of the nib 40, a fitting protrusion 42a for fitting into the fitting portion 18a provided in the fitting portion 18 of the tip shaft 15 is provided.

  The porous body 45 serving as a writing part (pen core) is fixed to the tip of the holding body 55. For example, natural fiber, animal hair fiber, polyacetal resin, polyethylene resin, acrylic resin, polyester system Resin, polyamide-based resin, polyurethane-based resin, polyolefin-based resin, polyvinyl-based resin, polycarbonate-based resin, polyether-based resin, polyphenylene-based resin, parallel fiber bundles made of one or a combination of two or more, fibers such as felt It consists of a fiber core obtained by processing a bundle or resin processing of these fiber bundles, or a sintered core (porous body) obtained by sintering various plastic powders.

Examples of the shape of the porous body 45 serving as the writing unit include a chisel shape, a shell shape, a cylinder, an elliptical column, a cube, a rectangular parallelepiped, and the like, and the cross-sectional shape thereof is a trapezoid or a parallelogram. , Rhombus, kamaboko, half-moon, and the like. In this embodiment, a chisel-shaped sintered core is used. The chisel shape is a shape in which the tip forms an inclined surface with respect to the center line of the pen shaft, and the inclined surface is flat.
Further, the porous body 45 serving as a writing portion is preferably inclined at an angle of 40 to 90 ° with respect to the major axis direction of the main body axis so as to have an inclination easy to write. Then, the inclination is 75 °.
The shape, inclination, and the like of the porous body 45 serving as the writing portion are appropriately set according to the convenience of writing and the like. In addition, the porous body 45 serving as a writing part has a large drawn line width, preferably a writing part having a drawn line width of 2 mm or more, and more preferably a drawn line width of 3 mm or more.

The holding body 55 including the main body portion 42 is a material having visibility, such as PP, PE, PET, PEN, nylon (including amorphous nylon in addition to general nylon such as 6 nylon and 12 nylon). It is preferably composed of a material such as acrylic, polymethylpentene, polystyrene, ABS or the like and having a visible light transmittance of 50% or more.
When a material having a visible light transmittance of less than 50% is used, it may not be possible to effectively visually recognize characters written in the writing direction. In order to be able to exhibit a further good visual recognition function, a material that transmits 50% or more is preferable, and when the visible light transmittance is 80% or more, the material can be further visually recognized. The visible light transmittance can be obtained by measuring the reflectance using a multi-light source colorimeter.

  The holding body 55 can be configured using two or more types of materials from the viewpoint of further improving the durability and visibility of one type of each of the above materials, or is configured with two or more types of materials. In that case, it is preferable that at least one is made of a material having a visible light transmittance of 50% or more, and it can be molded by various molding methods such as injection molding and blow molding.

  As shown in FIGS. 3 and 4, the holding body 55 has at least one ink guiding part 50 for supplying ink to the writing part. In this embodiment, the area ratio of the visual recognition part One ink guiding portion 50 is provided so as to penetrate through the center in the longitudinal direction from the point that the ink is efficiently supplied to the porous body 45 serving as the writing portion. In addition, the shape, size, number, etc. of the ink guiding part 50 are such that the ink impregnated in the ink occlusion body 20 included in the writing instrument body becomes the writing part through the relay porous body 30, the ink guiding part 50, and the like. The shape, structure, size, number, etc. of the porous body 45 can be appropriately selected as long as the structure can efficiently supply ink to the porous body 45 by capillary action.

An annular stepped portion 48 is formed on the front side of the cylindrical portion 41 that is in contact with the front end surface of the relay porous body 30 serving as a relay core. A gap 49 is formed between the stepped portion 48 and the relay porous body 30. The gap 49 is a distance at which the end face of the relay porous body 30 does not come into contact with the stepped portion 48. Preferably, the length of the gap in the longitudinal direction is 0 <gap length ≦ 2 mm. In this embodiment, it is constituted by a 1 mm gap. In the gap portion 49, an opening-type convex portion 49 a that is smaller than the diameter of the relay porous body 30 and larger than the diameter of the ink guiding portion 50 is formed between the step portion 48 and the ink guiding portion 50. Yes.
In the nib 40 having this structure, the ink from the ink occlusion body 20 is subjected to capillary force action on the relay porous body 30, the gap portion 49, the convex portion 49a, the ink guiding portion 50, and the porous body (pen core) 45 serving as a writing portion. It is structured so that it can be continuously supplied, prevents the ink from drooling when writing, and can stabilize the writing flow and use up the ink in the ink occlusion body sufficiently. .
On the outer peripheral surface of the main body portion 42 of the nib 40, a fitting protrusion 42a for fitting into the fitting portion 18a provided in the fitting portion 18 of the tip shaft 15 is provided. Note that the bottom surface of the main body portion 42 is a flat surface shaving portion 44.

Furthermore, rib bodies 56 and 56 for holding the porous body 45 serving as a pen core are provided on both side surfaces on the upper side of the holding body 55, and the bottom surface of the porous body 45 is abutted between the rib bodies 56 and 56. It is the contact surface part 57 which contacts. An outlet 50 a of the ink guiding portion 50 is disposed at the center of the contact surface portion 57.
The contact surface portion 57 of the holding body 55 serves as an adhesive surface with the bottom surface portion of the porous body 45 serving as a pen core, and a projection 58 is formed on the contact surface portion 57.

The shape of the protrusions 58, the location on the contact surface portion 57, the number thereof, and the like are not particularly limited as long as they can further improve the adhesion of the adhesive surface between the pen core 45 and the holding body 55. However, preferably, the cross-sectional shape of the protrusion 58 is a trapezoidal shape, a triangular shape, a quadrangular shape, a semicircular shape, a pointed shape, a hexagonal shape, or a pentagonal shape as shown in FIGS. Things. Further, the arrangement location may be such that the protrusions are randomly formed on the contact surface portion 57, are formed concentrically on the ink guide portion outlet 50a, or are formed so as to connect the rib bodies 56, 56. . It is particularly preferable that the ink guide portion outlet 50a is formed concentrically.
In addition, the height (h) of the protrusions 58 having the shapes shown in FIGS. 5A to 5G is preferably 0.05 to 0.25 mm. If the height of the projecting portion 58 is too low or too high, the above-described 0.05 to 0.25 mm may be taken into consideration if sufficient adhesion between the holding body 55 and the pen core 45 cannot be obtained. Preferably, the height is

In the present embodiment, one protruding portion 58 is formed concentrically at the ink guiding portion outlet 50 a of the contact surface portion 57 of the holding body 55. In this concentric protrusion 58, the separation width from the ink guiding portion 50a varies depending on the shape and size of the porous body 45 serving as a pen core, but the width of the protrusion 58 is preferably 0.05 to 0.5 mm is desirable, and the separation width from the ink guide protrusion 50a is preferably 0.1 to 0.5 mm. In this embodiment, the separation width of the protrusion 58 from the ink guiding portion protrusion 50a is 0.3 mm, the width of the protrusion 58 is 0.1 mm, and the height is 0. 0. It is 1mm .

In the writing instrument of this embodiment, the bottom surface of the pen core 45 that is in close contact with the contact surface portion 57 of the holding body 55 is desirably so-called smooth with a low surface roughness Ra.
Further, a stopper portion 59 for stopping the front end surface of the pen core 45 in contact with one end surface of the rib bodies 56, 56 is provided, and the other end surface serves as an entrance for inserting the pen core 45.

  As shown in FIG. 1, the cap body 60 is detachably attached to the front shaft 15 by fitting or the like, and includes an inner cap portion 61 that protects the pen core 45, a cylindrical outer cap portion 62, and the like. The concave portion 63 having improved design is formed on the surface portion of the outer cap portion 62. The opening surface on the front side of the outer cap portion 62 is a wide opening surface so that the writing instrument can be inverted on a flat surface such as a desk.

  The writing instrument A of the present embodiment configured as described above can solve the conventional problems and exhibit the effects of the present invention. That is, in the past, when a porous body made of a sintered core or the like was used as a pen core, there were some cases where the adhesion state of the sintered core was poor, and the adhesiveness to the holding body during mass production etc. (Sealability) deteriorates, and air enters the ink guide tube from the gap between the adhesive surfaces, and ink may not be sufficiently supplied. In the adhesion surface between the body 55 and the porous body 45 serving as the pen core, the protrusion 58 is formed on the holding body 55, thereby further improving the adhesion of the adhesion surface between the pen core and the holding body. Thus, the air can be prevented from entering the ink guide tube 50, and the ink from the ink occlusion body 20 can be efficiently and sufficiently supplied to the pen core 45, so that a writing instrument free from writing scrapes and ink shortages can be obtained.

In the present embodiment, as described above, the pen tip 40 has at least one pen core 45 serving as a writing unit, and at least one ink guiding unit 50 that holds the pen core 45 and supplies ink to the writing unit. The holding body 55 has a relay porous body 30 for supplying the ink contained in the ink storage body 20 to the ink guiding portion 50 provided on the holding body 55, and the holding body 55 includes: Since it is made of a material having visibility, the entire surface (the whole) other than the ink guiding portion 50 in the holding body 55 becomes a visual recognition portion that can visually recognize the writing direction. The tip of the pen 15 protruding from the tip of the shaft 15 can be 40% or more. Preferably, the visual recognition part on the side surface of the holding body 55 of the pen tip is also 40% or more. Longitudinal center By forming and suitably setting the length in the width direction, the diameter, the cross-sectional area, etc. of the ink guiding part 50, the area ratio of the visual recognition part can be further set to about 50% or more and about 90% at the maximum, It is possible to provide a writing instrument that can be provided with sufficient visibility to surely read characters written in the writing direction as compared with the prior art and that can be used until the final writing. In particular, by forming the ink guiding portion 50 at the center portion in the longitudinal direction of the holding body 55, ink can be efficiently supplied to the porous body 45 serving as the writing portion without unevenness. Will be provided.
In addition, by forming the ink guiding portion 50 at the center portion in the longitudinal direction of the holding body 55, the writing direction can be easily determined and the shape can be very easily written. Furthermore, by providing the rib bodies 56 on the upper portion of the holding body 55, when writing with a ruler, a straight line or the like can be drawn without contaminating the ruler.
Furthermore, by using a mechanism in which the liquid is directly supplied to the ink guiding portion 50, the ink can be efficiently supplied to the porous body 45 serving as a pen core.

  Next, FIGS. 8-13 shows the other examples (2nd Embodiment-4th Embodiment) of the writing instrument of this invention, Compared with the said 1st Embodiment of the said FIGS. 1-7, Except that the number of concentric protrusions 58 formed on the contact surface portion 57 of the holding body 55 is changed, the shaft cylinder 10 serving as the writing instrument main body (shaft portion), the ink occlusion body 20, the relay porous body 30, and the protrusion portions. The shape, structure, etc. of the nib 40 and the cap body 60 excluding the number 58 are the same as those in the above-described embodiment (FIGS. 1 to 7). The same applies to the third and subsequent embodiments).

The writing instrument which becomes 2nd Embodiment of FIG.8 and FIG.9 is a form which formed the concentric protrusion part of the said 1st Embodiment in the approximate center part of the ink guidance | guidance | derivation part outlet 50a, and the circumference | surroundings of two places of the circumference | surroundings. Specifically, the protrusion 58 is formed at the same position as in the first embodiment, and the protrusions 58a and 58a are formed around the protrusion 58. In this embodiment, the separation width of the protrusion 58a formed around the protrusion 58 from the protrusion 58 is 1.5 mm, the width of the protrusion 58a is 0.1 mm, and the height is 0.1 mm. .

  The writing instrument which becomes 3rd Embodiment of FIG.10 and FIG.11 is a form which formed the concentric protrusion part in the approximate center part of the ink guidance | guidance | derivation part exit 50a, and the circumference | surroundings 3 places in total. Specifically, the protrusions 58, 58a, and 58a are formed at the same position as in the second embodiment, and the concentric circle having the same structure as the protrusion 58a is further provided between the protrusions 58 and 58a (at equal intervals). It is the form which formed the shape | mold projection part 58b, 58b.

Writing instrument comprising a fourth embodiment of FIG. 1 2 and 1 3, as in the third embodiment, forms a concentric projections at a substantially central portion and the total of three locations of the surrounding ink guide portion outlet 50a This is a form in which the height of the protrusion is increased. Specifically, the protrusions 58, 58a, and 58b are formed at the same position as in the third embodiment, and the height of each protrusion is changed from 0.1 mm to 0.2 mm.
In the writing instrument according to the second to fourth embodiments, the number of protrusions on the holding body 55 is increased or the height thereof is changed on the bonding surface between the holding body 55 and the porous body 45 serving as a pen core. As a result, the adhesiveness of the adhesive surface between the pen core and the holder is further improved, and a writing instrument free from writing scrapes and ink shortages can be obtained.

The present invention is not limited to the above-described embodiment, and can be modified into various forms without departing from the gist of the present invention.
In the present invention, for example, the ink supply mechanism to the writing unit is not particularly limited, and in the writing instrument A of the above embodiment, the ink from the ink storage body 20 is supplied with the relay porous body 30, the gap portion 49, the convex portion 49a, and the holding body. 55, the ink guide 50 and the pen core 45 can be continuously supplied by capillary action, but the ink is omitted without providing the gap 49 and the gap 49 and the protrusion 49a. May be supplied.
Further, the ink from the ink storage body 20 is accommodated in the relay porous body 30 and the ink guiding portion 50 is accommodated in the ink guiding core composed of the porous body, and the ink from the ink storage body 20 is relayed in the relay porous body 30 and the ink guiding portion 50. It is good also as a structure which can be continuously supplied to the ink induction core and the pen core 45 by capillary force action.
Further, in the writing instrument A of the above embodiment, the shaft cylinder of the writing instrument body is formed as an elliptical axis, but it may be a cylindrical shape, a triangular shape, a quadrangle, a polygonal shape of a quadrangle or more.

  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]
(Writing instrument body, tip shaft configuration)
Writing instrument body, tip shaft configuration: PP (Pen tip configuration)
Writing part pen core: PE sintered core, porosity 60%, upper side length 5 mm, lower side length 6 mm, height 3 mm, chamfered on both sides of the front end face Holder (including main body part): acrylic resin, visible Light transmittance 85% [Reflectance was measured with a multi-light source spectrocolorimeter (MSC-5N) manufactured by Suga Test Instruments Co., Ltd.) to obtain a visible light transmittance. ]
The calculation of the visible area (area ratio) of the pen tip was performed by measuring the actual dimensions of the molded product, and the area ratio was 90%. Length: 11mm, thickness 3.2mm, width direction length 6.8mm
Ink guide part: cylindrical shape, diameter: 0.7 mm, length 7.1 mm, visible light transmittance of 27% with ink contained.
(Configuration of writing instrument members other than the nib)
Relay core: PET fiber bundle, porosity 65%, φ3 × 24mm
Ink occlusion body: PET fiber bundle, porosity 85%, φ13 × 55 mm
The size of the protrusion of the holding body and the adhesion between the pen core and the holding body were performed as follows.
The separation width from the ink guide portion outlet of the protrusion of the holder was 0.3 mm, the width of the protrusion was 0.1 mm, and the height was 0.1 mm.
Adhesion between the pen core and the holder was performed by impregnating an organic solvent (ethyl acetate) with the pen core attached to the holder from the chamfered portion side and drying.
Cap size: 1.5 cm length in the width direction, 2.8 cm length in the longitudinal direction, oval opening surface with a thickness of 1 mm, total length 3.2 cm, inner cap size: opening surface with an inner diameter of φ8 mm

(Ink composition)
As the ink, fluorescent peach ink having the following composition was used.
Coloring material: VC toner peach (manufactured by Mikuni Color Co., Ltd.) 30 parts by weight Wetting agent: Glycerin 25 parts by weight Preservative: Bioace (manufactured by KAI Kasei Co., Ltd.) 0.7 parts by weight Ion-exchanged water 44.3 parts by weight

  Using the writing instrument of Example 1 configured in this way, writing on the characters, when visually checking the appearance of the other side through the visual recognition part at the time of writing, the visibility is sufficient, It was very easy to see and I was able to write while reading the letters written in the writing direction. Further, even if the writing tool is written in units of 10 until the ink is used up, the adhesion of the adhesive surface between the pen core and the holding body is sufficiently maintained, and air from the adhesive surface to the ink guide tube is retained. It was found to be a writing instrument with no penetrating, no scratches and no ink.

  The writing instrument of the present invention can be suitably used for a type of writing instrument called an underline pen, a paint marker, an oil marker, or an aqueous marker.

A Writing instrument 10 Writing instrument body 11 Rear shaft 15 Front shaft 20 Ink occlusion body 30 Relay porous body 40 Pen tip 45 Writing section 50 Ink guide section 55 Holding body 58 Projection section 60 Cap body

Claims (2)

The pen tip comprises a porous body that becomes a writing part, and a holding body that holds the porous body and has at least one ink guide part for supplying ink to the writing part, and the ink contained in the writing instrument body, A writing instrument having a relay porous body for supplying to the ink guiding portion provided in the holding body, and the holding body serving as a visual recognition portion for visually recognizing the writing direction, wherein the holding body and the porous body are bonded. In the surface, a protrusion is formed on the contact surface portion that contacts the bottom surface of the porous body of the holding body , and the protrusion has a height of 0.05 to 0.25 mm and is concentric with the ink guiding portion of the holding body. Writing instrument characterized by being formed into   2. The writing instrument according to claim 1, wherein the protrusion is formed concentrically with an ink guiding portion of the holding body.

Images