JP2022105631A - Writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing utensil in which the whole of a writing portion comes in contact with a paper face without depending on an angle to the paper face of a penpoint, and a constant line width is obtained easily.

SOLUTION: A writing utensil 1 comprises a pen point 2 and a holding member 3 which holds the pen point 2. A front portion of the pen point 2 has an approximately rectangular cross section, and comprises a writing portion in a tip portion of the pen point 2. The writing portion protrudes forward from a tip portion of the holding member 3. The holding member 3 comprises a holding portion having an approximately rectangular cross section which surrounds the front portion of the pen point 2 in the tip portion, and comprises a notch-like opening portion in a sidewall of the holding portion.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a writing instrument. More specifically, the present invention relates to a writing tool such as a marking pen provided with at least a pen tip and a holding member for holding the pen tip.

Conventionally, in this kind of writing instrument, for example, in Patent Document 1, in a writing instrument in which a pen body forming a writing portion is arranged at the tip end portion of a shaft cylinder, the pen body is added to the shaft cylinder along with writing. A writing instrument is described in which the entire writing unit is tiltably supported so as to come into contact with the writing surface by force.

11 and 12 show a state 1 when writing on a paper surface with a conventional writing instrument, and FIGS. 13 and 14 show a state 2 when writing on a paper surface with a conventional writing instrument. In the above state 1, when the entire writing instrument is viewed from the direction along the extension line of the long side where the writing unit contacts the paper surface, the writing angle θ (that is, the angle between the axis of the writing instrument and the paper surface) is approximately 90 degrees. In the above state 2, the axis of the writing instrument is tilted with respect to the paper surface when the entire writing instrument is viewed from the direction along the extension line of the long side where the writing unit contacts the paper surface (for example,). , The writing angle θ is from about 30 degrees to about 60 degrees). When actually writing, it can be in either state 1 or state 2.

11 to 14 only show the posture of the writing instrument at the time of writing (that is, the writing angle θ, the traveling direction D in which the writing instrument moves at the time of writing, etc.), and the structure described in Patent Document 1 and the like. Is omitted.

Japanese Unexamined Patent Publication No. 2005-297540

In Patent Document 1, in the case of the state 1, the force F in the direction perpendicular to the paper surface applied to the barrel by writing exists in the virtual plane P in which the pen body tilts. That is, the force F in the direction perpendicular to the paper surface applied to the barrel during writing acts as a force for tilting the pen body as it is. As a result, the pen body is tilted so that the entire writing portion is in contact with the writing surface, so that a line drawn with a constant width can be easily drawn.

However, in the case of the above state 2, the force F in the direction perpendicular to the paper surface applied to the barrel due to writing does not exist in the virtual plane P in which the pen body tilts. That is, only a part of the force F in the vertical direction with respect to the paper surface applied to the barrel during writing acts as a force for tilting the pen body. This makes it difficult for the pen body to tilt properly, and there is a risk that writing will be performed with only a part of the writing part in contact with the writing surface, not the entire writing part.

Further, when the writing instrument is moved in the traveling direction D in the state 2, a force in the direction opposite to the barrel (that is, a force in the direction in which the pen body is pulled) is applied to the pen body. The direction of the force required for the pen body to tilt and the force in the direction in which the pen body is pulled are opposite to each other. This makes it difficult for the pen body to tilt properly, and there is a risk that writing will be performed in a state where only a part of the writing portion is in contact with the writing surface (a state in which the entire writing portion is not in contact with the paper surface).

As described above, in the case of state 2, the tilting mechanism does not operate properly and the pen body cannot be tilted so that the entire writing portion comes into contact with the writing surface, so that it may be difficult to draw a line with a certain width. There is.

Further, since the ink storage body is formed with a tilting allowable groove that allows tilting of the ink guiding portion of the pen body inserted therein, the contact state between the ink guiding portion of the pen body and the ink storage body is written. Since the contact state becomes unstable every time the ink is ejected, stable ink ejection from the pen body may not be obtained.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a writing instrument in which the entire writing portion comes into contact with the paper surface regardless of the angle of the pen tip with respect to the paper surface, and a constant line width can be surely obtained. It is something to do. In the present invention, "front" refers to the pen tip side, and "rear" refers to the opposite side.

The first invention of the present application is a writing instrument provided with at least a pen tip and a holding member for holding the pen tip, wherein the front portion of the pen tip has a substantially rectangular cross section and a tip portion thereof. A writing portion that comes into contact with the paper surface is provided, the tip portion of the holding member is provided with a holding portion having a substantially rectangular cross section that surrounds the front portion of the pen tip, and the writing portion is forward from the tip portion of the holding member. The side wall of the holding portion on the long side having a substantially rectangular cross section of the pen tip is provided with a notched opening having a front end open forward and a rear end closed. It is a requirement that the pen tip bends to the long side and can be deformed during writing.

The writing tool of the first invention has a writing tool having a substantially rectangular cross section at the front portion of the pen tip and having a writing portion in contact with the paper surface at the tip portion, and the tip portion of the holding member is in front of the pen tip. A holding portion having a substantially rectangular cross section surrounding the portion is provided, the writing portion is projected forward from the tip end portion of the holding member, and the side wall of the holding portion on the long side of the substantially rectangular cross section of the pen tip. In addition, it has a notch-shaped opening with the front end open forward and the rear end closed, and the opening allows the pen tip to bend and deform toward the long side during writing. Regardless of the angle, the entire writing section comes into contact with the paper surface, and a constant line width can be reliably obtained.

The second invention of the present application requires that the width of the opening is larger than the width of the long side of the substantially rectangular cross section of the pen tip in the writing tool of the first invention.

In the writing tool of the second invention, since the width of the opening is larger than the width of the long side of the pen tip having a substantially rectangular cross section, the pen tip bends more reliably to the long side during writing. It becomes deformable, and the entire writing portion comes into contact with the paper surface regardless of the angle of the pen tip with respect to the paper surface, and a constant line width can be reliably obtained.

A third aspect of the present invention is the writing instrument of the first or second invention, wherein the holding member is attached to the tip of both side walls of the holding portion on the short side having a substantially rectangular cross section of the pen tip. It is a requirement to have a pair of support pieces that come into contact with the paper surface during writing.

The writing tool of the third invention is
The holding member is provided with a pair of support pieces that come into contact with the paper surface during writing at the tips of both side walls of the holding portion on the short side having a substantially rectangular cross section of the pen tip. The contact with the paper surface prevents damage to the pen tip due to excessive bending, and the contact of the pair of support pieces with the paper surface can be used as a guideline for the writing pressure at which the entire writing portion is in contact with the paper surface.

In addition, when a pair of support pieces come into contact with the paper surface and a line is drawn on the paper surface using a ruler or the like, the support pieces hit the ruler or the like and the pen tip does not come into contact with the ruler or the like to prevent the ruler from being soiled by ink. It is also possible to prevent the stains on the ruler from being transferred to the pen tip and causing stains on the writing marks during writing.

A fourth aspect of the present application comprises a shaft cylinder connected to the holding member in the writing tool of any one of the first to third inventions, and the rear portion of the holding member is attached to the front portion of the shaft cylinder. A first contact wall portion is formed on the inner surface of the holding member, a second contact wall portion is formed on the inner surface of the barrel, and the first contact wall portion and the second contact wall portion are formed. It is a requirement that the outer surface of the pen tip is sandwiched in the front-rear direction by the portion.

The writing tool of the fourth invention includes a barrel connected to the holding member, the rear portion of the holding member is attached to the front portion of the barrel, and the first contact wall portion is attached to the inner surface of the holding member. Is formed, a second contact wall portion is formed on the inner surface of the barrel, and the outer surface of the pen tip is moved in the front-rear direction by the first contact wall portion and the second contact wall portion. By being sandwiched, it is possible to prevent the pen tip from falling off from the holding member or being buried in the holding member (front shaft), and it is possible to accurately maintain the amount of protrusion of the pen tip from the holding member.

In the fifth aspect of the present application, in the writing instrument of any one of the first to fourth aspects, the trailing edge of the opening is formed in a substantially straight line, and the top of the writing part is formed in a substantially straight line. It is a requirement that the angle of the trailing edge portion with respect to the axis is substantially the same as the angle of the top of the writing portion with respect to the axis.

The writing tool of the fifth invention is
The trailing edge of the opening is formed substantially linearly, the top of the writing portion is formed substantially linearly, and the angle of the trailing edge with respect to the axis is the angle of the top of the writing with respect to the axis. Since they are substantially the same, the load on the pen tip due to the bending of the pen tip is evenly applied to the front portion of the pen tip, and damage to the pen tip can be further prevented.

The angle of the trailing edge with respect to the axis refers to the angle of the portion of the angle formed by the trailing edge and the axis that indicates 90 degrees or less, and the angle of the top of the writing section with respect to the axis is the top. It refers to the angle of the part of the angle formed by the axis that indicates 90 degrees or less. Further, the fact that these two angles are substantially the same means that, in other words, the trailing edge portion and the top portion are substantially parallel. Further, these angles are set at 30 degrees or more and 90 degrees or less, preferably 45 degrees or more and 90 degrees or less.

A sixth aspect of the present application is the writing tool of any one of the first to fifth aspects, wherein the pen tip is a fiber nib, a felt-tip pen tip, a pen tip made of a porous body having open cells, and an axial direction. It must be one of the plastic nibs with a capillary passage.

In the writing tool of the sixth invention, the pen tip is one of a fiber pen tip, a felt pen tip, a pen tip made of a porous body having open cells, and a plastic pen tip having an axial capillary passage. Therefore, the pen tip has flexibility and can be flexed and deformed more reliably toward the long side, and the entire writing part comes into contact with the paper surface regardless of the angle of the pen tip with respect to the paper surface, ensuring a constant line width. Obtained in.

The seventh invention of the present application is required to provide the writing tool of any one of the first to sixth inventions with a direction identification unit for identifying the direction of the pen tip on the outer surface of the barrel.

Since the writing tool of the seventh invention is provided with a direction identification unit for identifying the direction of the pen tip on the outer surface of the barrel, it is not necessary to visually confirm the direction of the pen tip immediately before writing. After exposing the tip, it can be used for writing immediately.

The eighth invention of the present application is a writing instrument provided with a pen tip and a holding member for holding the pen tip, in which the pen tip protrudes forward from the tip of the holding member and the tip portion of the holding member. A notch-like opening is formed in the side wall of the pen, and the entire width direction of a certain longitudinal dimension portion of the pen tip located behind the tip of the holding member is exposed through the opening. Make it a requirement.

In the writing tool of the eighth invention, the pen tip protrudes forward from the tip of the holding member, and a notch-shaped opening is formed in the side wall of the tip of the holding member, and the pen tip is formed through the opening. Since the entire width direction of a certain longitudinal dimension portion of the pen tip located behind the tip of the holding member is exposed, the entire writing portion comes into contact with the paper surface regardless of the angle of the pen tip with respect to the paper surface. A constant line width is surely obtained.

According to the writing tool of the present invention, the entire writing portion comes into contact with the paper surface regardless of the angle of the pen tip with respect to the paper surface, and a constant line width can be reliably obtained.

It is a front view which shows the embodiment of this invention. It is an enlarged view of the main part of FIG. It is an enlarged perspective view of the main part of FIG. It is a vertical sectional view of FIG. FIG. 5A is a vertical sectional view of the holding member according to the embodiment of the present invention. 5 (b) is a sectional view taken along line BB of FIG. 5 (a). 5 (c) is a sectional view taken along line CC of FIG. 5 (a). FIG. 6A is a front view of the pen tip according to the embodiment of the present invention. FIG. 6B is a perspective view of the pen tip. FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. It is an enlarged view of the main part when the writing instrument of FIG. 1 is not writing, and the whole writing instrument is seen from the direction along the extension line of the long side where the writing part contacts the paper surface. It is an enlarged view of the main part when the writing instrument of FIG. 1 is writing, and the whole writing instrument is seen from the direction along the extension line of the long side where the writing part contacts a paper surface. It is an enlarged view of the main part when the writing instrument of FIG. 1 is writing, and the whole writing instrument is seen from the direction along the extension line of the short side where the writing part contacts a paper surface. It is a front view of the state 1 when writing on a paper surface by a conventional writing instrument, looking at the whole writing instrument from the direction along the extension line of the long side where the writing part contacts the paper surface. It is a perspective view of FIG. It is a front view of the state 2 when writing on a paper surface by a conventional writing instrument, looking at the whole writing instrument from the direction along the extension line of the long side where the writing part contacts the paper surface. It is a perspective view of FIG.

Embodiments of the present invention will be described with reference to the drawings.

1 to 10 show embodiments of the present invention / writing tool 1.

The writing instrument 1 mainly includes a pen tip 2, a holding member 3 that holds the pen tip 2, an ink occlusion body 6, and a front shaft 4 and a rear shaft 5 that house the ink storage body 6 inside. Then, the holding member 3 is press-fitted into the holding member fitting portion 44 of the front shaft 4.

-Pen tip The pen tip 2 is made of a porous body having open cells, one end of which is projected forward from the tip of the holding member 3 as a writing portion 21, and the other end (rear portion 25) is formed. It is connected to one end of the ink storage body 6 in a piercing manner. The writing unit 21 is ground into a chisel shape. Further, the writing unit 21 is not limited to the chisel shape, and may be ground into a shape suitable for the purpose such as a cannonball shape, a rectangular shape, a quadrangular prism shape, and a plate shape. The form of the writing instrument 1 of the present invention is not limited to the illustrated example, and may be a double-headed writing instrument in which pen bodies having different forms are attached to both ends of the ink storage body 6.

Further, as shown in FIGS. 8 and 9, when the entire writing instrument 1 is viewed from the direction along the extension line of the long side where the writing unit 21 contacts the paper surface 7, the writing unit 21 of the pen tip 2 is on the top portion 22. It is preferable to have a convex curved R shape. In the present invention, when the pen tip 2 bends, the entire writing portion comes into contact with the paper surface 7 regardless of the angle of the pen tip with respect to the paper surface 7, and a constant line width can be reliably obtained. The top 22 is preferably R-shaped in order to ensure contact with the paper surface 7.

As shown in FIGS. 4 and 6, the pen tip 2 includes a front portion 23 having a writing portion 21 at the tip thereof, and a cylindrical central portion 24 whose outer surface is sandwiched in the front-rear direction by a holding member 3 and a front shaft 4. A cylindrical rear end portion 25 connected to one end portion of the ink storage body 6 in a piercing manner is provided. The front portion 23 of the pen tip 2 has a substantially rectangular cross section, and the front portion 23 of the pen tip 2 has a flexibility that allows it to bend and deform toward the long side of the substantially rectangular cross section during writing.

The pen tip 2 is made of a porous body of synthetic resin having open cells. The pen tip 2 may be any other as long as it can flow ink and has flexibility. Specifically, the pen tip 2 has a fiber pen tip, a felt-tip pen tip, a brush pen tip, and an axial capillary passage. Examples include plastic pen tips.

-Ink storage body The ink storage body 6 may be made of a member having continuous pores capable of impregnating ink. For example, a heat-sealing processed body of a fiber bundle, a resin processed body of a fiber bundle, and a resin processing of a felt. Examples thereof include a body, a needle punched body of felt, a porous body (for example, an open cell of a synthetic resin such as a sponge) and the like. Further, the ink storage body 6 may be configured to have an outer skin made of a synthetic resin film or the like on the outer peripheral surface thereof.

Front shaft The front shaft 4 is a tubular body obtained by injection molding or extrusion molding of a synthetic resin with both ends open. As shown in FIG. 4, a holding member fitting portion 44 into which the outer surface of the rear end portion (fourth rib 37d) of the holding member 3 is press-fitted is formed on the inner surface of the front end portion of the front shaft 4. Further, a plurality of (here, eight) vertical ribs 43 extending in the axial direction are integrally formed at equal intervals on the rear inner peripheral surface of the holding member fitting portion 44 of the front shaft 4. The central portion 24 of the pen body 2 is sandwiched in the front-rear direction by the first contact wall portion 36 of the holding member 3 and the second contact wall portion 41 at the front end of the vertical rib 43. As a result, it is possible to prevent the pen tip 2 from falling off from the holding member 3 or being buried in the holding member 3 (front shaft 4), and it is possible to accurately regulate the amount of protrusion of the pen tip 2 from the holding member 3. Further, the third contact wall portion 42 at the rear end of the vertical rib 43 sandwiches the front end portion of the ink storage body 6 in the front-rear direction.

The rear shaft 5 connected to the rear end of the front shaft 4 is a cylindrical bottomed cylinder composed of a bottom wall and a peripheral wall, the front end being opened and the rear end being closed, and a synthetic resin (for example, for example). Obtained by injection molding of polypropylene, etc.). The front shaft 4 is hermetically fitted to the rear shaft 5 by screwing or press fitting.

The front shaft 4 is provided with a direction identification portion 45 having a protrusion extending in the axial direction for identifying the direction of the pen tip 2 on the outer surface. As a result, it is not necessary to visually confirm the orientation of the pen tip 2 immediately before writing, and the pen tip 2 can be used for writing immediately after being exposed.

-Holding member The holding member 3 is a tubular body obtained by injection molding of synthetic resin with both ends open. As shown in FIG. 5, a pair of a plurality of (here, two) extending in the axial direction, in which the front portion 23 of the pen tip 2 is press-fitted onto the inner surfaces of both side walls on the long side of the holding member 3. The first rib 37a is formed. A pair of second ribs 37b extending in the axial direction (here, two) are formed on the inner surfaces of both side walls of the holding member 3 on the short side side to reinforce the support piece 35 described later. As shown in FIG. 7, the second rib 37b is preferably non-contact with the front portion 23 of the pen tip 2, but may be in contact with the second rib 37b. When the second rib 37b is not in contact with the front portion 23 of the pen tip 2, it is possible not only to reinforce the support piece 35 but also to further increase the flexibility of the writing portion 21 of the pen tip 2. ..

When writing, when the pen tip 2 bends, the front end 23 side surface of the pen tip 2 is supported by the front end of the first rib 37a before it comes into contact with the rear end edge portion 34. The front ends of the first rib 37a and the second rib 37b are chamfered or provided with a convex curved R shape. As a result, when the pen tip 2 is bent, it is possible to prevent an excessive load from being applied to the front portion 23 of the pen tip 2 by the front ends of the first rib 37a and the second rib 37b. Further, this prevents the front portion 23 of the pen tip 2 from coming into contact with the rear end edge portion 34 described later when the pen tip 2 is bent, and reliably prevents the pen tip 2 from being broken or damaged. Can be done.

A plurality of (here, four) third ribs 37c extending in the axial direction into which the central portion 24 of the pen tip 2 is press-fitted are formed on the inner surface of the rear end portion of the holding member 3 having a circular cross-sectional shape. Formed at intervals. On the outer surface of the rear end portion of the holding member 3 having a circular cross-sectional shape, a plurality of (six in this case) fourth ribs extending in the axial direction to be press-fitted into the holding member fitting portion 44 of the front shaft 4 are fourth ribs. 37d are formed at equal intervals. The communication hole formed by the fourth rib 37d and the holding member fitting portion 44 of the front shaft 4 functions as an air flow hole and enables smooth ink ejection from the pen tip 2.

As shown in FIG. 2 or 3, the holding member 3 is provided with a holding portion 31 having a substantially rectangular cross section at the tip portion surrounding the front portion 23 of the pen tip 2, and the writing portion 21 is the tip portion of the holding member 3. Protruding forward from. Further, the holding member 3 has a front end opened forward and a rear end closed on both side walls 32 of the holding portion 31 on the long side having a substantially rectangular cross section of the pen tip 2, and the width of the holding member 3 is the pen tip 2. A notch-shaped opening 33 having a width larger than the width on the long side having a substantially rectangular cross section is provided. As a result, the front portion 23 of the pen tip 2 can be bent and deformed toward the long side during writing, and the entire writing portion comes into contact with the paper surface 7 regardless of the angle of the pen tip 2 with respect to the paper surface 7, and a constant line width is ensured. Obtained in.

The opening 33 may be provided only on one side wall 32 of the holding portion 31, but by providing the opening 33 on both side walls 32, the user can bend in an appropriate direction regardless of whether the user is left-handed or right-handed. It will be possible and more convenient.

Even if the user is right-handed, not only when the long side of the writing unit 21 is used to draw a line from left to right in the horizontal direction, but also when a line is drawn from right to left in the horizontal direction. A case is also assumed. In that case, by providing the openings 33 on both side surfaces 32 of the holding portion 31, it is possible to bend in an appropriate direction, and the convenience can be further enhanced.

The holding member 3 is located at the tip of both side walls of the holding portion 31 on the short side having a substantially rectangular cross section of the pen tip 2, in front of the rear end edge portion 34 of the opening 33, which comes into contact with the paper surface 7 during writing. A pair of protruding support pieces 35 are provided. As shown in FIG. 10, when the pair of support pieces 35 come into contact with the paper surface 7, it is possible to prevent the pen tip 2 from being broken or damaged due to excessive bending, and to bring the entire writing portion into contact with the paper surface. The support piece 35 becomes tapered toward the front, and a convex curved surface is formed at the front end thereof.

Further, when a pair of support pieces 35 come into contact with the paper surface 7 to draw a line on the paper surface 7 using a ruler or the like, the support pieces 35 hit the ruler or the like and the pen tip 2 does not come into contact with the ruler or the like. It is possible to prevent the ruler from being soiled due to the ruler, and it is possible to prevent the stain on the ruler from being transferred to the writing unit 21 to cause the stain on the writing mark during writing.

Further, since the support member 3 has a pair of support pieces 35, when the pen tip 2 is inserted into the cap or the like of the writing instrument 1, the pen tip 2 comes into contact with the inner surface of the cap to prevent ink from adhering to the inner surface of the cap. be able to. When the ink adheres to the inner surface of the cap, the ink adhered to the inner surface of the cap is transferred and adhered to the outer surface of the front shaft 4 when the cap is fitted to the writing tool 1. As a result, when the user removes the cap again and grips the front shaft 4 of the writing tool 1, there is a risk that the hand will be soiled with ink.

As shown in FIG. 8, when the writing instrument 1 is not writing, the writing unit 21 and the support piece 35 are located on the substantially axis of the writing instrument 1. On the other hand, as shown in FIG. 9, when the writing instrument 1 is writing, when the entire writing instrument is viewed from the direction along the extension line of the long side in contact with the paper surface 7, the writing instrument 21 (top 22) is on the axis of the writing instrument 1. It is out of the range. That is, the writing portion 21 of the pen tip 2 is bent and deformed toward the long side. As a result, the entire writing portion 21 comes into contact with the paper surface 7 regardless of the angle of the pen tip 2 with respect to the paper surface 7, and a constant line width can be reliably obtained.

Further, as shown in FIG. 8, the top portion 22 of the pen tip 2 projects forward from the tip end portion of the support piece 35, and the amount of protrusion thereof is larger than 0.2 mm and smaller than 5.0 mm, preferably 0. It is effective that it is larger than 5 mm and smaller than 2.0 mm. The smaller the amount of protrusion in the preferable range, the more rigid and firm the brush feeling is obtained, and the larger the amount of protrusion in the preferable range, the softer the brush feeling is obtained.

The trailing edge 34 is provided with a chamfer or R. In particular, it is preferable that a chamfer or R is provided at least on the edge on the pen tip 2 side where the pen tip 2 may come into contact. As a result, if the pen tip 2 is excessively bent, it may come into contact with the rear end edge portion 34, but even in that case, the load applied to the front portion 23 of the pen tip 2 can be minimized. , It is possible to prevent the pen tip 2 from being broken or damaged more reliably.

As shown in FIG. 2, the rear end edge portion 34 of the opening 33 is formed substantially linearly, the top portion 22 of the writing portion 21 is formed substantially linearly, and the angle of the trailing end edge portion 34 with respect to the axis is written. Since the angle of the top portion 22 of the portion 21 with respect to the axis is substantially the same, the load on the pen tip 2 of the rear end edge portion 34 due to the pen tip 2 being excessively bent is uniform on the front portion 23 of the pen tip 2. It is possible to reliably prevent the pen tip 2 from being broken or damaged.

The angle of the trailing edge portion 34 with respect to the axis refers to the angle of the portion of the angle formed by the trailing edge portion 34 and the axis that indicates 90 degrees or less, and is the angle of the top 22 of the writing portion 21 with respect to the axis. Refers to the angle of the portion of the angle formed by the top portion 22 and the axis line, which indicates 90 degrees or less. Further, the fact that these two angles are substantially the same means that the trailing end edge portion 34 and the top portion 22 are substantially parallel to each other. Further, these angles are set at 30 degrees or more and 90 degrees or less, preferably 45 degrees or more and 90 degrees or less.

As shown in FIG. 2, when the entire writing instrument is viewed from the direction along the extension line of the short side where the writing unit 21 contacts the paper surface, the shape of the pen tip 2 exposed from the holding member 3 is a substantially parallelogram or It is a rectangle. As a result, the grinding direction of the writing portion 21 (that is, the shape of the pen tip) can be grasped by the shape of the trailing end edge portion 34, so that it is not necessary to confirm the direction only by the direction of the pen tip 2 immediately before writing, and the pen tip does not need to be confirmed. After exposing 2, it can be used for writing immediately.

Further, it is more preferable that the color of the holding member 3 is different from the color of the pen tip 2 (that is, the ink color). As a result, the orientation of the trailing edge portion 34 becomes more conspicuous, and it becomes easier to confirm the grinding direction (that is, the shape of the pen tip) of the writing portion 21. When the pen tip 2 itself is colored with a dark color such as black and the holding member 3 is colored with a bright color different from that of the pen tip 2, the direction of the trailing edge portion 34 is further conspicuous, and the writing portion 21 It becomes easier to check the grinding direction (that is, the shape of the pen tip).

1 Writing tool 2 Pen tip 21 Writing part 22 Top part 23 Front part 24 Central part 25 Rear part 3 Holding member 31 Holding part 32 Side wall 33 Opening part 34 Rear end edge part 35 Support piece 36 First contact wall part 37a First rib 37b 2nd rib 37c 3rd rib 37d 4th rib 4 Front shaft 41 2nd contact wall part 42 3rd contact wall part 43 Vertical rib 44 Holding member fitting part 45 Direction identification part 5 Rear shaft 6 Ink occlusion 7 Paper surface D Travel direction F Vertical force applied to the shaft cylinder during writing P Virtual plane where the pen body tilts θ Writing angle

As shown in FIGS. 4 and 6, the pen tip 2 includes a front portion 23 having a writing portion 21 at the tip thereof, and a cylindrical central portion 24 whose outer surface is sandwiched in the front-rear direction by a holding member 3 and a front shaft 4. , A cylindrical rear portion 25 connected to one end of the ink storage body 6 in a piercing manner. The front portion 23 of the pen tip 2 has a substantially rectangular cross section, and the front portion 23 of the pen tip 2 has a flexibility that allows it to bend and deform toward the long side of the substantially rectangular cross section during writing.

Front shaft The front shaft 4 is a tubular body obtained by injection molding or extrusion molding of a synthetic resin with both ends open. As shown in FIG. 4, a holding member fitting portion 44 into which the outer surface of the rear end portion (fourth rib 37d) of the holding member 3 is press-fitted is formed on the inner surface of the front end portion of the front shaft 4. Further, a plurality of (here, eight) vertical ribs 43 extending in the axial direction are integrally formed at equal intervals on the rear inner peripheral surface of the holding member fitting portion 44 of the front shaft 4. The central portion 24 of the pen tip 2 is sandwiched in the front-rear direction by the first contact wall portion 36 of the holding member 3 and the second contact wall portion 41 at the front end of the vertical rib 43. As a result, it is possible to prevent the pen tip 2 from falling off from the holding member 3 or being buried in the holding member 3 (front shaft 4), and it is possible to accurately regulate the amount of protrusion of the pen tip 2 from the holding member 3. Further, the third contact wall portion 42 at the rear end of the vertical rib 43 sandwiches the front end portion of the ink storage body 6 in the front-rear direction.

Further, since the holding member 3 has a pair of support pieces 35, when the pen tip 2 is inserted into the cap or the like of the writing instrument 1, the pen tip 2 comes into contact with the inner surface of the cap to prevent ink from adhering to the inner surface of the cap. be able to. When the ink adheres to the inner surface of the cap, the ink adhered to the inner surface of the cap is transferred and adhered to the outer surface of the front shaft 4 when the cap is fitted to the writing tool 1. As a result, when the user removes the cap again and grips the front shaft 4 of the writing tool 1, there is a risk that the hand will be soiled with ink.

Claims (8)

A writing tool including at least a pen tip and a holding member for holding the pen tip, wherein the front portion of the pen tip has a substantially rectangular cross section and the tip portion has a writing portion that comes into contact with a paper surface. The tip of the holding member includes a holding portion having a substantially rectangular cross section that surrounds the front portion of the pen tip, and the writing portion is projected forward from the tip portion of the holding member to cross the pen tip. The side wall of the holding portion on the long side of a substantially rectangular shape is provided with a notched opening in which the front end is opened forward and the rear end is closed, and the opening allows the pen tip to be on the long side during writing. A writing instrument characterized by being able to bend and deform to the side. The writing tool according to claim 1, wherein the width of the opening is larger than the width of the long side of the pen tip having a substantially rectangular cross section. The first or second aspect of the present invention, wherein the holding member includes a pair of support pieces that come into contact with the paper surface at the time of writing at the tips of both side walls of the holding portion on the short side having a substantially rectangular cross section of the pen tip. Writing instrument. A shaft cylinder connected to the holding member is provided, the rear portion of the holding member is attached to the front portion of the shaft cylinder, a first contact wall portion is formed on the inner surface of the holding member, and the inner surface of the shaft cylinder is formed. A second contact wall portion is formed in the above, and the outer surface of the pen tip is sandwiched in the front-rear direction by the first contact wall portion and the second contact wall portion. Writing tools described in any of. The trailing edge of the opening is formed substantially linearly, the top of the writing section is formed substantially linearly, and the angle of the trailing edge with respect to the axis is the angle of the top of the writing section with respect to the axis. The writing tool according to any one of claims 1 to 4, which is substantially the same. The method according to any one of claims 1 to 5, wherein the pen tip is any one of a fiber pen tip, a felt-tip pen tip, a pen tip made of a porous body having open cells, and a plastic pen tip having an axial capillary passage. Writing utensils. The writing tool according to any one of claims 1 to 6, wherein the outer surface of the barrel is provided with a direction identifying unit for identifying the direction of the pen tip. A writing instrument including a pen tip and a holding member for holding the pen tip. The pen tip protrudes forward from the tip of the holding member, and a notch-like shape is formed on the side wall of the tip of the holding member. A writing instrument characterized in that an opening is formed, and the entire width direction of a certain longitudinal dimension portion of the pen tip located behind the tip of the holding member is exposed through the opening.

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