JP3088420B1 - Nib for marking pen - Google Patents

Abstract

An object of the present invention is to provide a pen nib for a marking pen that prevents uneven wear and softening of a tip portion and does not stain a ruler or paper when marking is performed using a ruler. SOLUTION: An outer peripheral surface of a fiber bundle 1 is covered with a covering member 2 made of synthetic resin, and a knife-cut surface a, a in which the covering member 2 is scraped off is formed on the tip side thereof. An inclined surface b is formed at the intersection of the cut surfaces a, a, and a portion where the inclined surface b intersects with the outer peripheral surface of the covering member 2 is cut by inclining with respect to the axis to cut off the covering member. 2, one of the two pen tip apexes p1 and p2 of the fiber bundle 1 is projected shorter than the other,
Abrasion and softening of the writing tip are reduced by the apical parts p1 and p of both nibs.
2 and a ruler 2 to be abutted on the tip side while making it substantially uniform
The distance between the edge of the pen 2 and the apex point p2 of the pen is sufficiently ensured so that ink does not flow between the ruler 22 and the paper surface 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous or oil-based marking pen nib.

[0002]

2. Description of the Related Art The nib of a marking pen is formed by impregnating synthetic resin fibers or the like with an adhesive so as to draw out ink in a writing instrument barrel by capillary action, and converging the adhesive. In order to perform a wide line drawing, a pen tip formed in a knife-cut shape is widely used.
For example, as shown in FIG. 3, such a conventional nib includes a fiber bundle 101 whose outer peripheral end is covered with a covering member 102 made of a synthetic resin. By forming the tip side covered with 102 into a knife-cut shape, both left and right ends of the tip portion form a first pen tip vertex 103 and a second pen tip vertex 104, respectively. 103 protrudes from the lower end of the covering member 102, and the second pen tip apex 104 is configured to be substantially flush with the lower end of the covering member 102 (see Japanese Patent No. 2889683). And this nib is
The main theme is to secure an appropriate hardness at the tip of the pen tip. Further, when marking is performed using a ruler, even if the outer peripheral surface of the covering member 102 is in contact with the edge of the ruler, the ruler is set with ink. It is designed not to stain the edge of.

However, according to the above-mentioned conventional pen tip, only the first pen tip apex 103 protrudes from the covering member 102.
It is biased toward the protruding first pen tip apex 103 side, and accordingly, it becomes necessary to write with the writing implement upright with respect to the paper surface, and there is a problem that it becomes difficult to write gradually.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to prevent uneven abrasion and softening of a tip portion and to perform marking using a ruler. An object of the present invention is to provide a pen for a marking pen that does not stain a ruler or the paper surface even when the operation is performed.

[0005]

According to the technical means of the present invention for achieving the above object, a first aspect of the present invention relates to a method of manufacturing a fiber bundle which is impregnated with an adhesive and bundled.
By covering with a synthetic resin covering member molded integrally with the body and forming the tip side in a knife cut shape,
In a nib for a marking pen in which the covering member of the portion is scraped off to form a knife-cut surface exposing the fiber bundle and a tip surface is formed at an intersection of the knife-cut surfaces on both sides, By cutting the portion where the surface intersects with the outer peripheral surface of the covering member by inclining with respect to the axis, both the two apexes of the fiber bundle are projected from the covering member , and the One protruding dimension
Modulo shorter than the other, the projecting dimension of the shorter 0.4
It is characterized by being within the range of 0.8 mm. Also,
According to a second aspect of the present invention, the front end surface and the outer peripheral surface of the covering member intersect.
Inclined angle to cut the part to be inserted by inclining with respect to the axis
The degree is set at about 15 °.

According to the above technical means, the pen tip portions of both the inclined tip surfaces protrude from the covering member, so that the abrasion and softening of the writing tip portion are substantially reduced at both pen tip portions. Become uniform. In addition, since the point where the front end surface and the outer peripheral surface of the covering member intersect is inclined with respect to the axis, the inclination causes the edge of the ruler to be abutted at the time of marking and the tip of the pen tip. Spacing is ensured. Furthermore, by reducing the size of both the pen tip apexes protruding from the covering member and making the other shorter than one, the covering member wraps the fiber bundle more on the other side, and wear and tear of the writing tip portion and In addition to preventing softening, the necessary minimum hardness for easy writing at the writing tip is ensured. In addition, the shorter protrusion dimension of the pen tip apex is more preferably 0.5 to
It is within the range of 0.6 mm. In other words, when the thickness is less than 0.4 mm, the above-mentioned effect of uniformizing the wear and softening of the writing tip portion is not sufficiently exerted. This is because the tip portion contacts the ruler and soils the ruler.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an example of a marking pen nib according to the present invention. This marking pen nib is coated with a covering member 2 on the distal end side of an outer peripheral surface of a fiber bundle 1 which is impregnated with an adhesive and bundled, and a knife-cut writing tip 10 is formed on the distal end side. .

The fiber bundle 1 is formed by impregnating a synthetic fiber with an adhesive to form an axial bundle and draws ink from the rear end to the front end by capillary action.
In the illustrated example, the diameter of the rear end side is reduced in two steps so as to be attached to the ink storage portion of the writing implement. The covering member 2 is made of a synthetic resin and is integrally formed on the outer peripheral surface of the fiber bundle 1.

[0009] The writing tip 10 grinds the knife cut surfaces a and a, the tip inclined surface b, and the outer peripheral inclined surfaces c1 and c2 on the distal end side of the fiber bundle 1 in which the covering member 2 is integrally formed. It is formed by things. The order of the grinding may be determined in consideration of processing efficiency, processing accuracy, and the like, and is not limited to the above.

The knife-cut surfaces a, a are two flat surfaces gradually narrowing toward the distal end, and are formed by grinding the distal end sides of the integrated fiber bundle 1 and the covering member 2 into a knife-cut shape. .

The tip inclined surface b is the knife cut surface a,
a is a tip end surface formed by obliquely grinding the tip end side of a. In the illustrated example, the width dimension H3 is set to 0.6 mm (see FIG. 1B), and the inclination angle β with respect to the shaft radial direction is set. Is set to 20 ° (see FIG. 2).

The outer peripheral inclined surfaces c1 and c2 are formed by grinding the intersection of the tip inclined surface b and the outer peripheral surface of the covering member 2 together with the inner fiber bundle 1 with respect to the axis. , The left and right exposed fiber bundle 1 (FIG. 1 (a) or FIG.
Reference). In the illustrated example, reference numeral c1
Is an outer peripheral inclined surface on the left side, reference numeral c2 is an outer peripheral inclined surface on the right side, and the inclination angle α of both the outer peripheral inclined surfaces c1 and c2 with respect to the axis is set to 15 °.

By the above grinding process, the writing tip 10 is
A first pen tip apex p1 protruding from the covering member 2 at the tip of the left outer peripheral inclined surface c1 and a second pen tip apex protruding from the covering member 2 also at the distal end of the right outer inclined face c2. p2. And the second pen tip vertex p2
Are projected from the covering member 2, the dimension H2 is shorter than the dimension H1 at which the first pen tip vertex p1 projects from the covering member 2. In the illustrated example, the dimension H1 is 1.73 mm,
The dimension H2 is set to 0.5 mm.

According to the pen tip having the above-described configuration, when the pen tip is attached to the writing implement and is written, both the first pen tip vertex p1 and the second pen tip vertex p2 protrude from the covering member 2. Therefore, the abrasion and softening of the writing tip become substantially uniform without being biased toward any of the pen tip apexes. Therefore, the writing angle of the writing implement 21 is maintained for a long time. In addition, as shown in FIG. 1C, when marking is performed using the ruler 22, the distance W between the edge of the ruler 22 and the vertex p2 of the second pen tip is sufficiently increased by the outer peripheral inclined surfaces c1 and c2. Therefore, it is difficult for the ink to flow between the ruler 22 and the paper surface 23. In addition, since the dimension H2 at which the second pen tip vertex p2 protrudes from the covering member 2 is shorter than the dimension H1 at which the first pen tip vertex p1 protrudes from the covering member 2, the second pen tip apex is formed. On the p2 side, the covering member 2 wraps the fiber bundle 1 more to prevent the tip portion from being softened by writing, and at the writing tip portion, maintains an appropriate hardness that is neither too hard nor too soft.

[0015]

Since the present invention is configured as described above, it has the following effects. Since the abrasion and softening of the writing tip are substantially uniform at both apexes, a stable writing posture in which the writing angle does not change can be maintained for a long time. In addition, when marking is performed using the ruler, the gap between the edge of the ruler and the tip of the pen tip is sufficiently ensured, so that the ruler and the paper surface are not stained with ink. Furthermore, by making the size of both the pen tip apexes protruding from the covering member shorter than the other, uneven wear and softening of the writing tip can be prevented, and the writing tip has an appropriate writing tip. Good writing feel can be obtained to maintain the hardness.

[Brief description of the drawings]

FIG. 1 shows an example of a pen tip for a marking pen according to the present invention, wherein (a) is a front view, (b) is a side view, and (c) is a front view showing a use state.

FIG. 2 is an enlarged sectional view of a main part of the pen tip for the marking pen.

FIG. 3 is a front view showing an example of a conventional marking pen nib.

[Explanation of symbols]

1: Fiber bundle 2: Covering member 10: Writing tip p1: First pen tip apex p2: Second pen tip apex a: Knife cut surface b: Tip inclined surface c1: Outer peripheral inclined surface c2: Outer peripheral inclined surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-11-59054 (JP, A) JP-A-56-164346 (JP, A) Fully open 1984-162281 (JP, U) Really open 1954- 166945 (JP, U) Japanese Utility Model Application 55-93580 (JP, U) Patent 2896883 (JP, B2) Patent 2841292 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B43K 1 / 12

Claims (2)

(57) [Claims] 1. An outer peripheral surface of a fiber bundle bundled by impregnating with an adhesive is covered with a synthetic resin covering member formed integrally with the fiber bundle body, and the tip side is formed in a knife-cut shape. By doing so, the coating member at that portion is scraped off to form a knife-cut surface exposing the fiber bundle, and further, a pen tip for a marking pen having a tip surface formed at the intersection of the knife-cut surfaces on both sides. In the above, by cutting a portion where the front end surface and the outer peripheral surface of the covering member intersect with each other at an angle with respect to the axis, both of the two nibs of the fiber bundle are projected from the covering member.
It is allowed, and the projecting dimension of its one shorter than the other, nib marking pen, wherein the projecting dimension of the shorter is in the range of 0.4 to 0.8 mm. 2. The method according to claim 1, wherein the distal end surface and an outer peripheral surface of the covering member are in contact with each other.
Incline to cut the intersection at an angle to the axis
The angle is set to approximately 15 °.
The nib for a marking pen according to claim 1.