JP2023086988A - Writing utensil - Google Patents

Abstract

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

Description

The present invention relates to writing instruments. More particularly, it relates to a writing instrument such as a marking pen that includes at least a pen tip and a holding member that holds the pen tip.

In conventional writing instruments of this type, for example, Patent Document 1 discloses a writing instrument in which a pen body having a writing portion is arranged at the tip of a barrel, and the pen body is added to the barrel during writing. A writing instrument is described which is tiltably supported so that the entire writing portion is brought into contact with the writing surface by force.

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

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

JP 2005-297540 A

In the above-mentioned Patent Document 1, in the case of the above-described state 1, the force F in the direction perpendicular to the paper surface applied to the barrel during writing exists within the virtual plane P on 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 a result, the pen body is tilted so that the entire writing portion is in contact with the writing surface, making it possible to easily draw lines of a constant width.

However, in the case of State 2, the force F applied to the barrel during writing in the direction perpendicular to the paper surface does not exist within the virtual plane P on which the pen body tilts. That is, only part of 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 a result, it becomes difficult for the pen body to tilt appropriately, and there is a risk that writing will be performed in a state in which only a part of the writing unit, not the entire writing unit, is in contact with the writing surface.

Furthermore, when the writing implement is moved in the traveling direction D in state 2, a force is applied to the pen body in the opposite direction to the barrel (that is, a force in the direction in which the pen body is pulled). The direction of the force required to tilt the pen body and the force in the direction in which the pen body is pulled are opposite to each other. As a result, it becomes difficult for the pen body to tilt properly, and there is a risk that writing will be performed with only a portion of the writing section in contact with the writing surface (the entire writing section does not contact 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 section is in contact with the writing surface, making it difficult to draw lines of a certain width. There is

In addition, since the ink occluding body is formed with a tilting allowance groove for allowing the tilting of the ink guiding part of the pen body inserted therein, the contact state of the ink guiding part of the pen body and the ink occluding body can be used for writing. Since the contact state becomes unstable due to a change each time, there is a possibility that stable ink ejection cannot be obtained from the pen body.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a writing instrument in which the entire writing portion is in contact with the paper surface regardless of the angle of the nib with respect to the paper surface, and a constant line width can be reliably obtained. It is something to do. In the present invention, "front" refers to the pen tip side, and "rear" refers to the opposite side.

A first invention of the present application is 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 substantially rectangular cross section and a A writing part that contacts a paper surface is provided, and the tip of the holding member includes a holding part that has a substantially rectangular cross section and surrounds the front part of the pen tip, and the writing part extends forward from the tip of the holding member. A notch-shaped opening having a front end opened forward and a rear end closed is provided in a side wall of the holding portion on the long side of the protruding pen tip and on the long side of the substantially rectangular cross section of the nib. , The pen tip must be flexible and deformable to the long side when writing.

In the writing instrument of the first invention, the front portion of the pen tip has a substantially rectangular cross section and a writing portion that contacts a paper surface is provided at the tip, and the tip of the holding member is positioned in front of the pen tip. The writing part protrudes forward from the tip of the holding member, and the side wall of the holding part on the longer side of the substantially rectangular cross section of the nib. Furthermore, it has a cut-out opening with its front end opened forward and its rear end closed, and the opening allows the pen tip to bend and deform toward the long side during writing, so that the pen tip does not move against the paper surface. Regardless of the angle, the entire writing part is in contact with the paper surface, and a constant line width can be reliably obtained.

A second invention of the present application is the writing instrument according to the first invention, wherein the width of the opening is larger than the width of the long side of the substantially rectangular cross section of the nib.

In the writing instrument of the second invention, the width of the opening is larger than the width of the long side of the substantially rectangular cross section of the pen tip, so that the pen tip more reliably bends toward the long side during writing. It becomes deformable, and regardless of the angle of the pen tip with respect to the paper surface, the entire writing part is in contact with the paper surface, and a constant line width can be reliably obtained.

A third invention of the present application is the writing instrument according to the first or second invention, wherein the holding member is provided at the distal end portion of both side walls of the holding portion on the short side side of the substantially rectangular cross section of the pen tip, It is required to have a pair of support pieces that come into contact with the paper surface when writing.

The writing instrument 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 sides of the substantially rectangular cross section of the pen tip. The contact with the paper surface prevents the pen tip from being damaged due to excessive bending, and the contact of the pair of support pieces with the paper surface can be used as a measure of the writing pressure at which the entire writing part is in contact with the paper surface.

In addition, since the pair of support pieces come into contact with the paper surface, when a ruler or the like is used to draw a line on the paper surface, the support pieces come into contact with the ruler, etc., and the pen tip does not come into contact with the ruler, etc., preventing the ruler from being stained with ink. In addition, it is possible to prevent handwriting stains during writing due to stains adhering to the ruler being transferred to the pen tip.

A fourth invention of the present application is the writing instrument according to any one of the first to third inventions, further comprising a barrel connected to the holding member, the rear portion of the holding member being attached to the front portion of the barrel, 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 are formed. It is a requirement that the outer surface of the pen tip is sandwiched in the front-rear direction by the part.

The writing instrument according to the fourth aspect of the invention comprises 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 inner surface of the holding member is provided with a first contact wall portion. A second contact wall portion is formed on the inner surface of the barrel, and the outer surface of the pen tip is moved forward and backward by the first contact wall portion and the second contact wall portion. By being sandwiched, it is possible to prevent the pen tip from slipping out of the holding member or being buried in the holding member (front barrel), and to accurately maintain the amount of protrusion of the pen tip from the holding member.

A fifth invention of the present application is the writing instrument according to any one of the first to fourth inventions, wherein the rear 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. , the angle of the trailing edge with respect to the axis is substantially the same as the angle of the top of the writing part with respect to the axis.

The writing instrument of the fifth invention is
The rear edge of the opening is formed in a substantially straight line, the top of the writing section is formed in a substantially straight line, and the angle of the rear edge with respect to the axis is the same as the angle of the top of the writing section with respect to the axis. By being substantially the same, the load on the pen tip due to 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 an angle of 90 degrees or less in the angle formed by the trailing edge and the axis, and the angle of the apex of the writing part with respect to the axis is It refers to the angle of the part showing 90 degrees or less among the angles formed with the axis. In other words, the fact that these two angles are substantially the same means that the trailing edge and the top are substantially parallel. Also, 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 invention of the present application is the writing instrument according to any one of the first to fifth inventions, wherein the pen tip comprises a fiber nib, a felt pen nib, a pen nib made of a porous body having open cells, and a Requires any of the plastic nibs with capillary passages.

In the writing instrument according to the sixth invention, the pen tip is any one of a fiber pen tip, a felt pen tip, a pen tip made of a porous material having open cells, and a plastic pen tip having an axial capillary passage. The more flexible the pen tip, the more reliably it can be bent and deformed on the long side, and the entire writing part is in contact with the paper surface regardless of the angle of the pen tip to the paper surface, ensuring a constant line width. obtained in

A seventh invention of the present application is the writing instrument according to any one of the first to sixth inventions, wherein an outer surface of the barrel is provided with a direction identifying portion for identifying the direction of the pen tip.

In the writing instrument of the seventh invention, since the outer surface of the barrel is provided with a direction identifying portion for identifying the direction of the pen tip, there is no need to visually confirm the direction of the pen tip just before writing, and the pen can be After exposing the tip, it can be used for writing immediately.

An eighth invention of the present application is a writing instrument comprising a pen tip and a holding member for holding the pen tip, wherein the pen tip projects forward from the tip of the holding member, and the tip of the holding member a notch-shaped opening is formed in the side wall of the pen tip, and through the opening, the whole width direction of a fixed longitudinal dimension portion of the nib located behind the tip of the holding member is exposed. be a requirement.

In the writing instrument according to the eighth aspect, the pen tip protrudes forward from the tip of the holding member, and a notch-shaped opening is formed in a side wall of the tip of the holding member. , the entire width direction of the fixed longitudinal dimension portion of the pen tip located behind the tip of the holding member is exposed, so that the entire writing portion is in contact with the paper surface regardless of the angle of the pen tip with respect to the paper surface; A constant line width is reliably obtained.

According to the writing instrument of the present invention, the entire writing part is in 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 showing an embodiment of the invention. FIG. 2 is an enlarged view of a main portion of FIG. 1; FIG. 3 is an enlarged perspective view of a main portion of FIG. 2; FIG. 3 is a longitudinal 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 of FIG. 5(a). FIG. 5(c) is a sectional view taken along line CC of FIG. 5(a). FIG. 6(a) is a front view of the pen tip of the embodiment of the present invention. FIG. 6(b) is a perspective view of the pen tip. FIG. 3 is an enlarged cross-sectional view taken along line AA of FIG. 2; FIG. 2 is an enlarged view of the main part of the entire writing instrument of FIG. 1 as seen from the direction along the extended line of the long side where the writing part contacts the paper surface when the writing instrument of FIG. 1 is not writing. FIG. 2 is an enlarged view of the main part of the entire writing instrument of FIG. 1 as seen from the direction along the extended line of the long side where the writing part contacts the paper surface when writing with the writing instrument of FIG. 1 ; FIG. 2 is an enlarged view of the main part of the entire writing instrument of FIG. 1 as seen from the direction along the extension of the short side where the writing part contacts the paper surface when writing with the writing instrument of FIG. 1 ; 1 is a front view of the entire writing instrument in State 1 when writing on paper with a conventional writing instrument, as seen from the direction along the extended line of the long side where the writing unit contacts the paper surface; FIG. FIG. 12 is a perspective view of FIG. 11; FIG. 10 is a front view of the entire writing instrument in state 2 when writing on paper with a conventional writing instrument, as seen from the direction along the extended line of the long side where the writing unit contacts the paper surface. FIG. 14 is a perspective view of FIG. 13;

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

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

A writing instrument 1 mainly comprises a pen tip 2, a holding member 3 holding the pen tip 2, an ink occluding body 6, and a front barrel 4 and a rear barrel 5 accommodating the ink occluding 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 material having open cells, and one end thereof projects forward from the tip of the holding member 3 as a writing part 21, and the other end (rear part 25) is It is connected to one end of the ink occluding body 6 in a stabbing manner. The writing part 21 is ground into a chisel shape. Moreover, the writing part 21 is not limited to the chisel shape, and may be ground into a shell shape, a rectangular shape, a quadrangular prism shape, a plate shape, or other shape according to the purpose. 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 of different forms are attached to both ends of the ink occluding body 6 .

8 and 9, when the entire writing instrument 1 is viewed from the direction along the extension of the long side where the writing part 21 contacts the paper surface 7, the writing part 21 of the pen tip 2 is located at the top part 22. It is preferable to have an R shape with a convex curved surface. According to the present invention, the bending of the pen tip 2 allows the entire writing portion to come 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. In order to ensure contact with the paper surface 7, the top portion 22 preferably has an R shape.

As shown in FIGS. 4 and 6, the pen tip 2 has a front portion 23 having a writing portion 21 at its tip, and a cylindrical center portion 24 whose outer surface is sandwiched between the holding member 3 and the front shaft 4 in the front-rear direction. , and a cylindrical rear end 25 connected to one end of the ink occluding body 6 in a piercing manner. The front portion 23 of the pen tip 2 has a substantially rectangular cross section, and has flexibility to bend and deform toward the long sides of the substantially rectangular cross section during writing.

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

・Ink occluding body The ink occluding body 6 may be made of a member having continuous pores that can be impregnated with ink. body, needle-punched felt body, porous body (for example, open-cell body of synthetic resin such as sponge), and the like. In addition, the ink occluding body 6 may be configured to have an outer skin made of a synthetic resin film or the like on its outer peripheral surface.

- Front shaft The front shaft 4 is a tubular body obtained by injection molding or extrusion molding of a synthetic resin and having both ends opened. As shown in FIG. 4, the inner surface of the front end portion of the front shaft 4 is formed with 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. A plurality of (eight here) vertical ribs 43 extending in the axial direction are integrally formed on the rear inner peripheral surface of the holding member fitting portion 44 of the front shaft 4 at equal intervals. The central portion 24 of the pen body 2 is sandwiched between 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 in the front-rear direction. As a result, it is possible to prevent the pen tip 2 from falling out of the holding member 3 or being buried in the holding member 3 (front barrel 4), and 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 occluding body 6 in the front-rear direction.

The rear shaft 5 connected to the rear end of the front shaft 4 is a cylindrical body with an open front end and a closed rear end. polypropylene, etc.) by injection molding. The front shaft 4 is hermetically fitted to the rear shaft 5 by screwing or press-fitting.

The front barrel 4 has, on its outer surface, a direction identifying portion 45 formed of a projection extending in the axial direction for identifying the direction of the pen tip 2 . Thus, it is not necessary to visually check the direction of the pen tip 2 just before writing, and the pen tip 2 can be used for writing immediately after being exposed.

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

When the pen tip 2 is bent during writing, the side surface of the front portion 23 of the pen tip 2 is supported by the front end of the first rib 37a before contacting the rear edge portion 34. As shown in FIG. The front ends of the first ribs 37a and the second ribs 37b are chamfered or rounded with convex curved surfaces. As a result, when the pen tip 2 is bent, the front ends of the first ribs 37a and the second ribs 37b can prevent an excessive load from being applied to the front portion 23 of the pen tip 2. FIG. In addition, when the pen tip 2 is bent, the front part 23 of the pen tip 2 is prevented from coming into contact with the rear edge part 34, which will be described later, thereby reliably preventing 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 center 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 section. Formed in intervals. A plurality (here, six) of fourth ribs extending in the axial direction and press-fitted into the holding member fitting portion 44 of the front axle 4 are provided on the outer surface of the rear end portion of the holding member 3 having a circular cross section. 37d are formed at regular intervals. A communication hole formed by the fourth rib 37d and the holding member fitting portion 44 of the front barrel 4 functions as an air circulation hole, enabling smooth ink ejection from the nib 2. As shown in FIG.

As shown in FIG. 2 or FIG. 3 , the holding member 3 has a holding portion 31 with a substantially rectangular cross section surrounding the front portion 23 of the pen tip 2 at the tip portion thereof. protrude forward from The holding member 3 has a front end opened forward and a rear end closed on both side walls 32 of a holding portion 31 on the longer side of the substantially rectangular cross section of the pen tip 2 . It has a notch-like opening 33 that is wider than the long side of the substantially rectangular cross section. 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 is in contact with the paper surface 7 regardless of the angle of the pen tip 2 with respect to the paper surface 7, ensuring a constant line width. obtained in

Although the opening 33 may be provided only on one side wall 32 of the holding part 31, providing it on both side walls 32 allows the user to bend in an appropriate direction regardless of whether the user is left-handed or right-handed. possible and more convenient.

Moreover, even when the user is right-handed, not only can he draw a line horizontally from left to right using the long side of the writing unit 21, but also he can draw a line horizontally from right to left. case is also assumed. In that case, by providing the openings 33 on both sides 32 of the holding part 31, it becomes possible to bend in an appropriate direction, and convenience can be further enhanced.

The holding member 3 is positioned forward of the rear end edge 34 of the opening 33, which contacts the paper surface 7 during writing, at the tips of both side walls of the holding portion 31 on the short side of the substantially rectangular cross section of the nib 2. A pair of projecting support pieces 35 are provided. As shown in FIG. 10, the pair of support pieces 35 contacting the paper surface 7 prevents the pen tip 2 from breaking or being damaged due to excessive bending, and allows the entire writing portion to contact the paper surface. The support piece 35 is tapered toward the front, and has a convex curved surface at its front end.

In addition, since the pair of support pieces 35 come into contact with the paper surface 7, when a line is drawn 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 contact the ruler or the like. It is possible to prevent the ruler from being soiled by the ruler, and to prevent the handwriting from being soiled during writing due to the dirt adhering to the ruler being transferred to the writing part 21.例文帳に追加

In addition, since the support member 3 has a pair of support pieces 35, when the pen tip 2 is inserted into the cap of the writing instrument 1 or the like, the ink is prevented from adhering to the inner surface of the cap due to the contact of the pen tip 2 with the inner surface of the cap. be able to. If 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 barrel 4 when the writing instrument 1 is fitted with the cap. As a result, when the user removes the cap again and grips the front barrel 4 of the writing instrument 1, there is a risk that the user's hands will be stained with ink.

As shown in FIG. 8, when the writing instrument 1 is not writing, the writing portion 21 and the support piece 35 are positioned substantially on the axis of the writing instrument 1 . On the other hand, as shown in FIG. 9, when the writing instrument 1 is writing, when the whole writing instrument is viewed from the direction along the extension of the long side that contacts the paper surface 7, the writing part 21 (top part 22) is on the axis line of the writing instrument 1. out of That is, the writing portion 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 with respect to the paper surface 7, the entire writing portion 21 is in contact with the paper surface 7, and a constant line width can be reliably obtained.

As shown in FIG. 8, the tip 22 of the pen tip 2 protrudes forward from the tip of the support piece 35, and the amount of protrusion is more than 0.2 mm and less than 5.0 mm, preferably 0.2 mm. Effectively, it is greater than 5 mm and less than 2.0 mm. Within the preferred range, the smaller the amount of protrusion, the more rigid and firm the feeling of writing can be obtained.

The trailing edge 34 is provided with a chamfer or radius. In particular, it is preferable to provide chamfering or R at least at 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 nib 2 bends excessively, it may come into contact with the trailing edge 34, but even then the load on the front part 23 of the nib 2 can be minimized. , breakage and damage to the pen tip 2 can be more reliably prevented.

As shown in FIG. 2, the rear edge portion 34 of the opening 33 is formed in a substantially straight line, the top portion 22 of the writing portion 21 is formed in a substantially straight line, and the angle of the rear edge portion 34 with respect to the Since the angle of the top portion 22 of the portion 21 with respect to the axis is substantially the same, the loading of the trailing edge 34 on the nib 2 due to excessive deflection of the nib 2 is evenly distributed to the front portion 23 of the nib 2. It is possible to reliably prevent the pen tip 2 from breaking or being damaged.

The angle of the trailing edge 34 with respect to the axis refers to an angle of 90 degrees or less in the angle formed by the trailing edge 34 and the axis, and the angle of the top 22 of the writing part 21 with respect to the axis. indicates an angle of 90 degrees or less among the angles formed by the top portion 22 and the axis. In other words, the fact that both angles are substantially the same means that the trailing edge portion 34 and the top portion 22 are substantially parallel. Also, 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, the shape of the nib 2 exposed from the holding member 3 is approximately a parallelogram or Rectangular. As a result, since the grinding direction of the writing part 21 (that is, the shape of the pen tip) can be grasped by the shape of the rear edge part 34, it is not necessary to confirm the direction only by the orientation of the pen tip 2 immediately before writing. After exposing 2, it can be used for writing immediately.

Moreover, 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 is more conspicuous, making it easier to check the grinding direction of the writing portion 21 (that is, the shape of the pen tip). If the pen tip 2 itself is colored in a dark color such as black and the holding member 3 is colored in a bright color different from that of the pen tip 2, the direction of the trailing edge 34 becomes even more conspicuous, and the writing part 21 becomes more conspicuous. It becomes easier to check the grinding direction (that is, the shape of the pen tip).

1 Writing instrument 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 34 Rear edge 35 Supporting piece 36 First contact wall 37a First rib 37b Second rib 37c Third rib 37d Fourth rib 4 Front shaft 41 Second contact wall portion 42 Third contact wall portion 43 Vertical rib 44 Holding member fitting portion 45 Direction identifying portion 5 Rear shaft 6 Ink occluding body 7 Paper surface D Direction of movement F Perpendicular force P to paper surface applied to barrel during writing Virtual plane θ on which pen body tilts Writing angle

As shown in FIGS. 4 and 6, the pen tip 2 has a front portion 23 having a writing portion 21 at its tip, and a cylindrical center portion 24 whose outer surface is sandwiched between the holding member 3 and the front shaft 4 in the front-rear direction. , and a cylindrical rear portion 25 connected to one end of the ink occluding body 6 in a piercing manner. The front portion 23 of the pen tip 2 has a substantially rectangular cross section, and has flexibility to bend and deform toward the long sides 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 and having both ends opened. As shown in FIG. 4, the inner surface of the front end portion of the front shaft 4 is formed with 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. A plurality of (eight here) vertical ribs 43 extending in the axial direction are integrally formed on the rear inner peripheral surface of the holding member fitting portion 44 of the front shaft 4 at equal intervals. The center 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 out of the holding member 3 or being buried in the holding member 3 (front barrel 4), and 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 occluding body 6 in the front-rear direction.

In addition, since the holding member 3 has a pair of support pieces 35, when the pen tip 2 is inserted into the cap of the writing instrument 1 or the like, the pen tip 2 is prevented from adhering to the inner surface of the cap due to the contact of the pen tip 2 with the inner surface of the cap. be able to. If 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 barrel 4 when the writing instrument 1 is fitted with the cap. As a result, when the user removes the cap again and grips the front barrel 4 of the writing instrument 1, there is a risk that the user's hands will be stained with ink.

Claims (8)

A writing instrument comprising at least a pen tip and a holding member that holds the pen tip, wherein the front part of the pen tip has a substantially rectangular cross section and a writing part that contacts a paper surface at the tip part. the tip of the holding member includes a holding portion having a substantially rectangular cross-section surrounding the front portion of the pen tip; the writing portion protrudes forward from the tip of the holding member and crosses the pen tip; A side wall of the holder on the long side of the substantially rectangular shape is provided with a notch-shaped opening with a front end opened forward and a rear end closed. A writing utensil characterized by being flexibly deformable to the side. 2. The writing instrument according to claim 1, wherein the width of said opening is larger than the width of the long side of said nib having a substantially rectangular cross section. 3. The holding member according to claim 1, wherein the holding member comprises a pair of support pieces that come into contact with a paper surface during writing, at tip portions of both side walls of the holding portion on short sides of the substantially rectangular cross section of the pen tip. Writing instrument. A barrel connected to the holding member is provided, the rear portion of the holding member is attached to the front portion of the barrel, the inner surface of the holding member is formed with a first contact wall portion, and the inner surface of the barrel is formed. and a second contact wall portion is formed in the pen tip, 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. The writing instrument according to any one of The rear edge of the opening is formed in a substantially straight line, the top of the writing section is formed in a substantially straight line, and the angle of the rear edge with respect to the axis is the same as the angle of the top of the writing section with respect to the axis. 5. The writing instrument according to any one of claims 1 to 4, which are substantially the same. 6. The pen tip according to any one of claims 1 to 5, wherein the pen tip is any one of a fiber pen tip, a felt pen tip, a pen tip made of a porous material having open cells, and a plastic pen tip having an axial capillary passage. writing instruments. 7. The writing instrument according to any one of claims 1 to 6, wherein an outer surface of said barrel is provided with a direction identifying portion for identifying a direction of said pen tip. A writing instrument comprising a pen tip and a holding member for holding the pen tip, wherein the pen tip protrudes forward from the tip of the holding member, and a side wall of the tip portion of the holding member is formed with a notch. 1. A writing instrument, comprising: an opening, through which an entire width direction of a fixed longitudinal dimension of said pen tip located behind a tip of said holding member is exposed.

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