JP7636466B2 - Writing implements - Google Patents

Description

The present invention relates to a writing instrument. In particular, the present invention relates to a writing instrument such as a marking pen that has at least a pen tip and a holding member that holds the pen tip.

For example, Patent Document 1 describes a conventional writing instrument of this type in which a pen body forming a writing part is disposed at the tip of a barrel, and the pen body is supported so that it can tilt freely so that the entire writing part comes into contact with the writing surface due to the force applied to the barrel when writing.

Note that Figures 11 and 12 show state 1 when writing on paper with a conventional writing implement, and Figures 13 and 14 show state 2 when writing on paper with a conventional writing implement. State 1 refers to a state in which the writing angle θ (i.e., the angle between the axis of the writing implement and the paper surface) is approximately 90 degrees when the writing implement is viewed as a whole from a direction along the extension of the long side where the writing part contacts the paper surface, and state 2 refers to a state in which the axis of the writing implement is inclined with respect to the paper surface (for example, the writing angle θ is approximately 30 degrees to approximately 60 degrees) when the writing implement is viewed as a whole from a direction along the extension of the long side where the writing part contacts the paper surface. When actually writing, either state 1 or state 2 can occur.

Note that Figures 11 to 14 only show the position of the writing implement when writing (i.e., the writing angle θ and the direction D in which the writing implement moves when writing, etc.), and omit the structure and other details described in Patent Document 1.

JP 2005-297540 A

In Patent Document 1, in the case of State 1, the force F applied to the barrel in the direction perpendicular to the paper surface as writing occurs exists within the imaginary plane P along which the pen body tilts. In other words, the force F applied to the barrel in the direction perpendicular to the paper surface as writing occurs acts directly as a force for tilting the pen body. As a result, the pen body tilts so that the entire writing part comes into contact with the writing surface, making it easy to draw a line of a constant width.

However, in the case of state 2, the force F perpendicular to the paper surface that is applied to the barrel when writing does not exist within the imaginary plane P along which the pen body tilts. In other words, only a portion of the force F perpendicular to the paper surface that is applied to the barrel when writing acts as a force to tilt the pen body. This makes it difficult for the pen body to tilt properly, and there is a risk that writing will be done with only a portion of the writing part in contact with the writing surface, rather than the entire writing part.

Furthermore, when the writing implement is moved in direction D in state 2, a force is applied to the pen body in the opposite direction to the barrel (i.e., a force in the direction in which the pen body is pulled). The force required to tilt the pen body is in the opposite direction to the force in the direction in which the pen body is pulled. This makes it difficult for the pen body to tilt properly, and there is a risk that writing will be done with only part of the writing part in contact with the writing surface (with the entire writing part not in contact with the paper).

As described above, in state 2, the tilting mechanism does not operate properly and the pen body cannot tilt so that the entire writing part comes into contact with the writing surface, which may make it difficult to draw a line of a consistent width.

In addition, the ink absorbing body has a tilt-permitting groove that allows the ink guide part of the pen body inserted into it to tilt. This means that the contact state between the ink guide part of the pen body and the ink absorbing body changes every time you write, making the contact state unstable, and there is a risk that stable ink ejection from the pen body will not be achieved.

The present invention aims to solve the above-mentioned problems of the conventional art by providing a writing implement that ensures that the entire writing part comes into contact with the paper surface and that a consistent line width can be obtained regardless of the angle of the pen tip relative to the paper surface. In this 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 implement comprising at least a pen tip and a holding member for holding the pen tip, the front part of the pen tip having a generally rectangular cross section and a writing part at the tip that contacts the paper surface, the tip of the holding member comprising a holding part having a generally rectangular cross section that surrounds the front part of the pen tip, the writing part protruding forward from the tip of the holding member, and the side wall of the holding part on the long side of the generally rectangular cross section of the pen tip has a notch-shaped opening whose front end is open forward and whose rear end is closed, the opening allowing the pen tip to bend and deform towards the long side when writing.

The writing implement of the first invention has a front portion of the tip of the pen that has a generally rectangular cross section and a writing portion that contacts the paper surface at the tip, the tip of the holding member has a holding portion that is generally rectangular in cross section and surrounds the front portion of the tip, the writing portion protrudes forward from the tip of the holding member, and the side wall of the holding portion on the long side of the generally rectangular cross section of the tip of the pen has a notched opening that is open at the front end and closed at the rear end, and the opening allows the tip to bend and deform toward the long side when writing, so that the entire writing portion contacts the paper surface regardless of the angle of the tip to the paper surface, and a consistent line width can be reliably obtained.

The second invention of the present application is a writing instrument according to the first invention, in which the width of the opening is greater than the width of the long side of the approximately rectangular cross section of the pen tip.

The writing instrument of the second invention has a width of the opening that is greater than the width of the long side of the approximately rectangular cross section of the pen tip, which allows the pen tip to bend and deform more reliably toward the long side when writing, and the entire writing part comes into contact with the paper surface regardless of the angle of the pen tip relative to the paper surface, ensuring that a consistent line width can be obtained.

The third invention of the present application is a writing instrument according to the first or second invention, in which the holding member is provided with a pair of support pieces that come into contact with the paper surface when writing, at the tip portions of both side walls of the holding portion on the short side of the approximately rectangular cross section of the pen tip.

The writing instrument of the third invention comprises:
The holding member is provided with a pair of support pieces that come into contact with the paper surface when writing, at the tips of both side walls of the holding part on the short side of the approximately rectangular cross section of the pen tip.The contact of the pair of support pieces 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 serve as a guide for the writing pressure when the entire writing part is in contact with the paper surface.

In addition, by having the pair of support pieces come into contact with the paper surface, when using a ruler or similar to draw a line on the paper, the support pieces come into contact with the ruler, etc., and the tip of the pen does not come into contact with the ruler, preventing the ruler from being soiled by ink. It also prevents dirt on the ruler from transferring to the tip of the pen, which can lead to smearing of handwriting when writing.

The fourth invention of the present application is a writing instrument according to any one of the first to third inventions, which comprises a barrel connected to the holding member, the rear of the holding member is attached to the front of the barrel, a first abutment wall is formed on the inner surface of the holding member, a second abutment wall is formed on the inner surface of the barrel, and the outer surface of the pen tip is clamped in the front-to-rear direction by the first abutment wall and the second abutment wall.

The writing instrument of the fourth invention comprises a barrel connected to the holding member, the rear of the holding member is attached to the front of the barrel, a first abutment wall is formed on the inner surface of the holding member, a second abutment wall is formed on the inner surface of the barrel, and the outer surface of the nib is clamped in the front-to-rear direction by the first abutment wall and the second abutment wall, thereby preventing the nib from falling out of the holding member or becoming embedded in the holding member (front barrel) and accurately maintaining the amount of protrusion of the nib from the holding member.

The fifth invention of the present application is a writing instrument according to any one of the first to fourth inventions, wherein the rear edge of the opening is formed in an approximately straight line, the top of the writing part is formed in an approximately straight line, and the angle of the rear edge relative to the axis is approximately the same as the angle of the top of the writing part relative to the axis.

The writing instrument of the fifth invention comprises:
The rear edge of the opening is formed in an approximately straight line, the top of the writing part is formed in an approximately straight line, and the angle of the rear edge relative to the axis is approximately the same as the angle of the top of the writing part relative to the axis.As a result, the load on the pen tip caused by bending of the pen tip is applied evenly to the front part of the pen tip, better preventing damage to the pen tip.

The angle of the rear edge with respect to the axis refers to the angle of the portion of the angle between the rear edge and the axis that is 90 degrees or less, and the angle of the tip of the writing part with respect to the axis refers to the portion of the angle between the tip and the axis that is 90 degrees or less. In other words, the fact that these two angles are approximately the same indicates that the rear edge and the tip are approximately parallel. These angles are set to be between 30 degrees and 90 degrees, and preferably between 45 degrees and 90 degrees.

The sixth invention of the present application is a writing instrument according to any one of the first to fifth inventions, in which the nib is one of a fiber nib, a felt nib, a nib made of a porous material with open cells, and a plastic nib with an axial capillary passage.

The writing instrument of the sixth invention has a nib that is either a fiber nib, a felt nib, a nib made of a porous material with open bubbles, or a plastic nib with an axial capillary passage, so that the nib is flexible and can bend and deform more reliably toward the long side, and the entire writing part comes into contact with the paper surface regardless of the angle of the nib relative to the paper surface, ensuring that a consistent line width can be obtained.

The seventh invention of the present application is a writing instrument according to any one of the first to sixth inventions, which is characterized in that the outer surface of the barrel is provided with a direction identification part that identifies the orientation of the pen tip.

The writing instrument of the seventh invention is provided with a direction identification portion on the outer surface of the barrel that identifies the direction of the pen tip, so that there is no need to visually check the direction of the pen tip immediately before writing, and writing can be started immediately after the pen tip is exposed.

The eighth invention of the present application is a writing implement comprising a pen tip and a holding member for holding the pen tip, the pen tip protruding forward from the tip of the holding member, a notched opening being formed in the side wall of the tip of the holding member, and a portion of the pen tip with a certain longitudinal dimension that is located rearward of the tip of the holding member is exposed through the opening in the full width direction.

In the writing implement of the eighth invention, the pen tip protrudes forward from the tip of the holding member, and a notched opening is formed in the side wall of the tip of the holding member, 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, so that the entire writing part comes into contact with the paper surface regardless of the angle of the pen tip relative to the paper surface, and a constant line width is reliably obtained.

With the writing instrument of the present invention, the entire writing part comes into contact with the paper surface regardless of the angle of the pen tip relative to the paper surface, ensuring a consistent line width.

1 is a front view showing an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of FIG. 1 . FIG. 3 is an enlarged perspective view of a main portion of FIG. 2 . FIG. 3 is a vertical cross-sectional view of FIG. 2 . Fig. 5(a) is a vertical cross-sectional view of a holding member according to an embodiment of the present invention, Fig. 5(b) is a cross-sectional view taken along line BB in Fig. 5(a), and Fig. 5(c) is a cross-sectional view taken along line CC in Fig. 5(a). Fig. 6(a) is a front view of the pen tip according to the embodiment of the present invention, and Fig. 6(b) is a perspective view of the pen tip. 3 is an enlarged cross-sectional view of line AA in FIG. 2. 2 is an enlarged view of the essential parts of the writing instrument of FIG. 1 when not writing, as viewed from the direction along the extension line of the long side where the writing part contacts the paper surface. FIG. 2 is an enlarged view of the essential parts of the writing instrument of FIG. 1 when viewed from the direction along the extension line of the long side where the writing part contacts the paper surface during writing. 2 is an enlarged view of a main portion of the writing instrument of FIG. 1 when viewed from the direction along the extension line of the short side where the writing part contacts the paper surface during writing. FIG. 1 is a front view of the entire writing instrument as viewed from the direction along the extension line of the long side where the writing part contacts the paper surface, showing state 1 when writing on paper with the conventional writing instrument. FIG. 12 is a perspective view of FIG. FIG. 2 is a front view of the entire writing instrument as seen from the direction along the extension line of the long side where the writing part contacts the paper surface, showing state 2 when writing on paper with the conventional writing instrument. FIG. 14 is a perspective view of FIG.

The embodiment of the present invention will be explained with reference to the drawings.

Figures 1 to 10 show an embodiment of the present invention, a writing instrument 1.

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

Pen tip The pen tip 2 is made of a porous material having open cells, one end of which protrudes forward from the tip of the holding member 3 as the writing part 21, and the other end (rear part 25) is connected in a piercing manner to one end of the ink occlusion body 6. The writing part 21 is ground into a chisel shape. The writing part 21 is not limited to a chisel shape, and may be ground into a shape according to the purpose, such as a bullet shape, a rectangular shape, a square prism shape, or 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-ended writing instrument in which pen bodies of different shapes are attached to both ends of the ink occlusion body 6.

Furthermore, as shown in Figures 8 and 9, when the writing instrument 1 is viewed as a whole from a direction along the extension of the long side where the writing part 21 contacts the paper surface 7, it is preferable that the writing part 21 of the pen tip 2 has a convex curved R shape at the top 22. In the present invention, the pen tip 2 flexes so that the entire writing part contacts the paper surface 7 regardless of the angle of the pen tip relative to the paper surface 7, and a consistent line width can be reliably obtained, so it is preferable that the top 22 has an R shape so that the top 22 reliably contacts the paper surface 7.

4 and 6, the pen tip 2 comprises a front portion 23 having a writing portion 21 at its tip, a cylindrical central portion 24 whose outer surface is sandwiched in the front-rear direction between the holding member 3 and the front shaft 4, and a cylindrical rear portion 25 which is connected in a piercing manner to one end of the ink occlusion body 6. The front portion 23 of the pen tip 2 has a substantially rectangular cross section, and has flexibility that allows it to flex and deform toward the longer side of the substantially rectangular cross section when writing.

The pen tip 2 is made of a porous synthetic resin with open bubbles. The pen tip 2 may be any other material that allows ink to flow through it and is flexible, and specific examples include fiber pen tips, felt pen tips, calligraphy pen tips, and plastic pen tips with axial capillary passages.

Ink Occluder The ink occluder 6 may be any material having continuous pores that can be impregnated with ink, such as a heat-sealed fiber bundle, a resin-processed fiber bundle, a resin-processed felt, a needle-punched felt, a porous body (for example, a synthetic resin open-cell body such as a sponge), etc. The ink occluder 6 may also be configured to have an outer skin made of a synthetic resin film or the like on its outer circumferential surface.

Front shaft The front shaft 4 is a cylindrical 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 is formed on the inner surface of the front end of the front shaft 4, into which the rear end outer surface (fourth rib 37d) of the holding member 3 is press-fitted. In addition, a plurality of (eight here) vertical ribs 43 extending in the axial direction are formed integrally at equal intervals on the rear inner peripheral surface of the holding member fitting portion 44 of the front shaft 4. The first abutment wall portion 36 of the holding member 3 and the second abutment wall portion 41 at the front end of the vertical rib 43 sandwich the center portion 24 of the nib 2 in the front-rear direction. This makes it possible to prevent the nib 2 from falling out of the holding member 3 or being buried in the holding member 3 (front shaft 4), and to accurately regulate the amount of protrusion of the nib 2 from the holding member 3. In addition, the third abutment wall portion 42 at the rear end of the vertical rib 43 sandwiches the front end of the ink occlusion body 6 in the front-rear direction.

The rear axle 5, which is connected to the rear end of the front axle 4, is a cylindrical body with a bottom, an open front end and a closed rear end, and is made by injection molding of a synthetic resin (e.g., polypropylene, etc.). The front axle 4 is airtightly fitted to the rear axle 5 by screwing or press-fitting.

The front shaft 4 has a direction identification part 45 on its outer surface, which is a protrusion extending in the axial direction that identifies the direction of the pen tip 2. This eliminates the need to visually check the direction of the pen tip 2 immediately before writing, and allows the pen tip 2 to be exposed and used for writing immediately.

The holding member 3 is a cylindrical body obtained by injection molding of synthetic resin with both ends open. As shown in FIG. 5, a pair of first ribs 37a (two in this case) extending in the axial direction is formed on the inner surface of both side walls on the long side of the holding member 3, into which the front part 23 of the pen tip 2 is press-fitted. A pair of second ribs 37b (two in this case) extending in the axial direction is formed on the inner surface of both side walls on the short side of the holding member 3, which reinforces the support piece 35 described later. As shown in FIG. 7, it is preferable that the second rib 37b does not contact the front part 23 of the pen tip 2, but it may contact the front part 23. In addition, when the second rib 37b does not contact the front part 23 of the pen tip 2, not only the support piece 35 is reinforced, but the flexibility of the writing part 21 of the pen tip 2 can be further increased.

When writing, when the nib 2 bends, the side of the front portion 23 of the nib 2 is supported by the front end of the first rib 37a before coming into contact with the rear end edge 34. The front ends of the first rib 37a and the second rib 37b are chamfered or have a convex curved R shape. This makes it possible to prevent excessive load from being applied to the front portion 23 of the nib 2 by the front ends of the first rib 37a and the second rib 37b when the nib 2 bends. This also prevents the front portion 23 of the nib 2 from coming into contact with the rear end edge 34 (described below) when the nib 2 bends, reliably preventing the nib 2 from breaking or being damaged.

Multiple (four in this case) third ribs 37c are formed at equal intervals on the inner surface of the circular cross section at the rear end of the holding member 3, and extend in the axial direction, into which the central portion 24 of the nib 2 is press-fitted. Multiple (six in this case) fourth ribs 37d are formed at equal intervals on the outer surface of the circular cross section at the rear end of the holding member 3, and extend in the axial direction, and are press-fitted into the holding member fitting portion 44 of the front barrel 4. The communication hole formed by the fourth ribs 37d and the holding member fitting portion 44 of the front barrel 4 functions as an air circulation hole, allowing smooth ink ejection from the nib 2.

As shown in Figures 2 and 3, the holding member 3 has a holding section 31 with a generally rectangular cross section at its tip that surrounds the front section 23 of the pen tip 2, and the writing section 21 protrudes forward from the tip of the holding member 3. The holding member 3 also has a notch-shaped opening 33 on both side walls 32 of the holding section 31 on the long side of the generally rectangular cross section of the pen tip 2, the front end of which is open forward and the rear end is closed, and the width of which is greater than the width of the long side of the generally rectangular cross section of the pen tip 2. This allows the front section 23 of the pen tip 2 to bend and deform toward the long side when writing, and the entire writing section comes into contact with the paper surface 7 regardless of the angle of the pen tip 2 relative to the paper surface 7, ensuring the production of a consistent line width.

The opening 33 may be provided on only one side wall 32 of the holding portion 31, but providing it on both side walls 32 allows the user to bend in the appropriate direction regardless of whether they are left-handed or right-handed, making it more convenient.

In addition, even if the user is right-handed, it is conceivable that the user may use the long side of the writing part 21 to draw a line horizontally from left to right, as well as horizontally from right to left. In such a case, providing openings 33 on both side surfaces 32 of the holding part 31 allows it to bend in the appropriate direction, making it more convenient.

The holding member 3 is provided with a pair of support pieces 35 that protrude forward from the rear edge 34 of the opening 33, which contact the paper surface 7 when writing, at the tip of both side walls of the holding part 31 on the short side of the approximately rectangular cross section of the pen tip 2. As shown in Figure 10, the pair of support pieces 35 contact the paper surface 7, preventing the pen tip 2 from bending too much and causing breakage or damage, and allowing the entire writing part to contact the paper surface. The support pieces 35 taper forward, and a convex curved surface is formed at their front ends.

In addition, by having the pair of support pieces 35 come into contact with the paper surface 7, when using a ruler or the like to draw a line on the paper surface 7, the support pieces 35 come into contact with the ruler or the like, and the pen tip 2 does not come into contact with the ruler or the like, preventing the ruler from being soiled by ink, and also preventing dirt on the ruler from being transferred to the writing part 21, causing handwriting smudges when writing.

Furthermore, by providing the holding member 3 with the pair of support pieces 35, when the pen tip 2 is inserted into the cap or the like of the writing instrument 1, it is possible to prevent ink from adhering to the inner surface of the cap due to contact between the pen tip 2 and the inner surface of the cap. If ink adheres to the inner surface of the cap, when the cap is fitted onto the writing instrument 1, the ink adhering to the inner surface of the cap is transferred and adhered to the outer surface of the front barrel 4. This raises the risk of the user's hands becoming dirty with ink when removing the cap again and gripping the front barrel 4 of the writing instrument 1.

As shown in Figure 8, when the writing instrument 1 is not writing, the writing part 21 and the support piece 35 are positioned approximately on the axis of the writing instrument 1. On the other hand, as shown in Figure 9, when the writing instrument 1 is writing, if the writing instrument is viewed as a whole from the direction along the extension of the long side that contacts the paper surface 7, the writing part 21 (top 22) is off the axis of the writing instrument 1. In other words, the writing part 21 of the pen tip 2 is bent and deformed toward the long side. As a result, regardless of the angle of the pen tip 2 relative to the paper surface 7, the entire writing part 21 contacts the paper surface 7, and a consistent line width is reliably obtained.

Also, as shown in FIG. 8, the top 22 of the pen tip 2 protrudes forward from the tip of the support piece 35, and it is effective that the amount of protrusion is greater than 0.2 mm and less than 5.0 mm, and preferably greater than 0.5 mm and less than 2.0 mm. The smaller the amount of protrusion within the preferred range, the more rigid and firm the writing feel will be, and the greater the amount of protrusion within the preferred range, the softer the writing feel will be.

The rear end edge 34 is chamfered or rounded. In particular, it is preferable to provide chamfering or rounding at least on the edge on the side of the pen tip 2 that may come into contact with the pen tip 2. As a result, if the pen tip 2 bends excessively, it may come into contact with the rear end edge 34, but even in that case, the load on the front part 23 of the pen tip 2 can be minimized, and the pen tip 2 can be more reliably prevented from breaking or being damaged.

As shown in FIG. 2, the rear edge 34 of the opening 33 is formed in a substantially straight line, the top 22 of the writing part 21 is also formed in a substantially straight line, and the angle of the rear edge 34 relative to the axis is substantially the same as the angle of the top 22 of the writing part 21 relative to the axis. As a result, the load on the tip 2 from the rear edge 34 due to excessive bending of the tip 2 is evenly applied to the front part 23 of the tip 2, reliably preventing the tip 2 from breaking or being damaged.

The angle of the rear edge 34 with respect to the axis refers to the angle of the portion of the angle between the rear edge 34 and the axis that is 90 degrees or less, and the angle of the tip 22 of the writing part 21 with respect to the axis refers to the portion of the angle between the tip 22 and the axis that is 90 degrees or less. In other words, the fact that these two angles are approximately the same indicates that the rear edge 34 and the tip 22 are approximately parallel. These angles are set to be between 30 degrees and 90 degrees, and preferably between 45 degrees and 90 degrees.

As shown in Figure 2, when the writing implement is viewed as a whole from a direction along the extension of the short side where the writing part 21 contacts the paper surface, the shape of the nib 2 exposed from the holding member 3 is approximately a parallelogram or a rectangle. As a result, the grinding direction of the writing part 21 (i.e. the shape of the nib) can be grasped from the shape of the rear end edge 34, so there is no need to check the direction just by looking at the orientation of the nib 2 immediately before writing, and writing can be started immediately after the nib 2 is exposed.

Moreover, it is more preferable that the color of the retaining member 3 is different from the color of the nib 2 (i.e., the ink color). This makes the orientation of the rear end edge 34 more prominent, making it easier to confirm the grinding direction of the writing portion 21 (i.e., the shape of the nib). If the nib 2 itself is colored a dark color such as black and the retaining member 3 is colored a light color different from the nib 2, the orientation of the rear end edge 34 will be even more prominent, making it easier to confirm the grinding direction of the writing portion 21 (i.e., the shape of the nib).

1 Writing implement 2 Pen tip 21 Writing portion 22 Top portion 23 Front portion 24 Central portion 25 Rear portion 3 Holding member 31 Holding portion 32 Side wall 33 Opening 34 Rear end edge portion 35 Support piece 36 First abutment wall portion 37a First rib 37b Second rib 37c Third rib 37d Fourth rib 4 Front shaft 41 Second abutment wall portion 42 Third abutment wall portion 43 Vertical rib 44 Holding member fitting portion 45 Direction identification portion 5 Rear shaft 6 Ink occluding body 7 Paper surface D Direction of travel F Force P perpendicular to the paper surface applied to the barrel as writing Virtual plane θ along which the pen body tilts Writing angle

Claims (3)

A writing instrument comprising at least a pen tip and a holding member for holding the pen tip, wherein the front portion of the pen tip has a roughly rectangular cross section and a plate-shaped writing portion at its tip that contacts the paper surface, the tip of the holding member comprises a holding portion, the writing portion protrudes forward from the tip of the holding member, the holding member has a pair of support pieces at the tips of both side walls of the holding portion on the short side of the roughly rectangular cross section of the pen tip, which contact the paper surface when writing, the support pieces having a convex curved surface formed at their front ends, and the side wall of the holding portion on the long side of the roughly rectangular cross section of the pen tip has a notch-shaped opening with a front end open to the front and a rear end closed, the opening allowing the pen tip to bend and deform toward the long side when writing . 2. The writing implement according to claim 1, wherein the width of the opening is greater than the width of a longer side of the substantially rectangular cross section of the pen tip. The writing implement according to claim 2, wherein the rear edge of the opening is formed in a substantially straight line, the top of the writing part is formed in a substantially straight line, and the angle of the rear edge relative to the axis is substantially the same as the angle of the top of the writing part relative to the axis.

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