JPH09207484A - Pen point for fountain pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pen point for a fountain pen which is used for slender writing and wares for a long time without causing a handwriting thick. SOLUTION: In a pen point 2 for a fountain pen with an ink groove slitted form the welded tip party 1a, the width if the tip part is set to 0.25mm of less and the surface of the pen point is ground into an elliptic sphere. When a character is written with the axial line of the fountain pen set to routine angle, the elliptic sphere-shaped pen point is positioned in such a manner that the spherical surface 2b of the elliptic sphere in parallel with the short axis Ls comes into contact with a plane P for writing and the abrasion of the pen points is caused in parallel with the short axis Ls when the writing is performed with the fountain pen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fountain pen nib for fine characters.

[0002]

2. Description of the Related Art A pen tip of a fountain pen is formed by punching a gold alloy plate or a stainless steel plate into a pen shape having a substantially triangular tip shape to form a pen tip body. Weld to the part and cut the ink groove from this tip. Then, the surface of the pen point is polished into a spherical shape or an elliptical shape so that the pen point can be smoothly written without being scratched. In addition, in the case of the pen tip of a fountain pen for popularization, the tip part of the pen tip body made of stainless steel plate is formed into a curved surface without using a pen point, and the curving process is applied to this curved surface part to write it. May be.

By the way, a fountain pen for fine print is required to write a small character with a thin handwriting, such as when writing a memo on a notebook, but a fountain pen tip for fine print is required. , A small pen point is used. When the pen point is not used, the writing portion that replaces the pen point is formed small.

[0004]

FIG. 4 shows a conventional example in which the surface of the pen point 2 welded to the tip portion 1a of the pen tip is ground into an elliptic spherical shape having a short axis Ls and a long axis Ll.
When writing with the axis of the fountain pen tilted at an angle of about 30 ° to 60 ° which is a normal writing angle, the paper surface P, which is the writing surface, is written.
Is an ellipsoidal sphere 2a parallel to the long axis Ll of the pen point 2.
Are in contact with each other.

In the pen tip for fine characters, a small pen point is used to reduce the contact area between the paper surface P and the ellipsoidal sphere 2a.
a wears and the wear progresses parallel to the long axis Ll, so that the contact area between the paper surface and the pen point increases rapidly and the handwriting becomes thick. In addition, even if the pen point is polished into a spherical shape, it will wear parallel to the diameter parallel to the paper surface. There is a problem that becomes.

[0006] Therefore, an object of the present invention is to provide a fountain pen nib for fine characters, which is hard to thicken the handwriting even when used for a long period of time.

[0007]

In order to achieve the above object, the present invention provides a fountain pen nib having an ink groove cut from a tip portion to which a pen point is welded. When the pen point surface is polished to an elliptic spherical shape while making it 25 mm or less and the fountain pen axis is written at a normal angle, the elliptic spherical pen point becomes
The ellipsoidal sphere parallel to the minor axis contacts the writing surface.

In the fountain pen nib which is formed by writing the tip of the nib body into a curved surface instead of the pen point, the width of the tip is 0.25 mm or less and the curved surface of the writing part is used. Is formed into an oval sphere, and when writing is performed with the axis of the fountain pen at a normal angle, the writing part having an oval sphere has an ellipsoidal sphere parallel to its minor axis in contact with the writing surface.

That is, the width of the tip of the pen tip body is set to 0.
The initial handwriting becomes very thin because it is less than 25 mm, but the elliptical spherical pen point or writing part is in contact with the writing surface because the elliptical spherical surface parallel to the short axis of the pen point contacts the writing surface.
The wear of the surface in contact with the writing surface proceeds parallel to the minor axis of the ellipse. Therefore, an increase in the contact surface between the writing surface and the pen point or the writing portion is suppressed, and the handwriting is unlikely to become thick even after long-term use.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. In FIG. 1, a pen tip body 1 is a gold alloy plate or a stainless steel plate punched out so that the tip shape becomes a substantially triangular shape, and a pen point 2 is welded to a tip portion 1a. The ink groove 3 is cut from the tip 1a. The width W of the tip portion 1a is 0.25 mm or less, for example, 0.20 mm, and it is possible to write with extremely fine handwriting.

The surface of the pen point 2 is polished into an elliptic spherical shape, but the tip 1a has an angle θ as shown in FIG.
Only folded inward. Here, the angle θ is 20
It is about 60 °. Pen point 2 which is an elliptical sphere
The direction of the surface of the pen with respect to the pen tip body 1 is the same as that shown in FIG. 4, and if the tip 1a is not bent inward by the angle θ, the axis of the fountain pen is 30 ° to 60 ° When writing at an angle of about °, the paper surface P has an elliptical spherical surface 2 parallel to the long axis Ll of the pen point 2.
a contacts.

However, in the present invention, since the tip 1a is bent inward by the angle θ, when writing with the axis of the fountain pen tilted at an angle of about 30 ° to 60 ° which is a normal writing angle, As shown in FIG.
An ellipsoidal spherical surface 2b parallel to the short axis Ls of the pen point 2 comes into contact. Therefore, the wear of the surface in contact with the paper surface P proceeds parallel to the minor axis Ls of the ellipse, so that the paper surface P
The increase in the contact surface of the pen point 2 is suppressed, and the handwriting is not likely to become thick even after long-term use. A greater effect can be obtained by increasing the ratio of the lengths of the short axis Ls and the long axis Ll when the hanging pen point 2 is an elongated elliptical sphere.

However, the tip portion 1 is the same as the ordinary pen tip.
Even if a is not bent inward, if the direction of the surface of the pen point 2 having an elliptic spherical shape with respect to the pen tip body 1 is made orthogonal to the conventional example shown in FIG. Since the ellipsoidal spherical surface 2b parallel to the short axis Ls comes into contact, the same effect can be obtained even if the direction of the surface of the pen point 2 with respect to the pen tip body 1 is orthogonal to the conventional example. Also, when the pen point 2 of the pen body of the popular fountain pen is replaced with the pen point 2 which is integrally formed with the pen body 1, the same thing as described in the above embodiment applies.

[0014]

As described above, in the fountain pen nib of the present invention, when the width of the tip is 0.25 mm or less and the fountain pen axis is written at a normal angle,
Since the ellipsoidal spherical point parallel to the minor axis of the pen point or writing part of the elliptical sphere is in contact with the writing surface,
It can be used as a fountain pen tip for fine print that does not thicken the handwriting even after long-term use.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an explanatory diagram of an angle between a paper surface and a pen tip during writing.

FIG. 4 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Pen tip body 1a Tip of pen tip body 2 Pen point 2a Ellipsoidal sphere parallel to long axis of pen point 2b Ellipsoidal sphere parallel to short axis of pen point 3 Ink groove Ll Long axis of ellipse sphere of pen point Ls Pen Short axis of ellipsoid of point P

Claims (2)

[Claims] 1. A fountain pen nib having an ink groove cut from the tip of a nib body to which a pen point is welded, wherein the tip has a width of 0.25 mm or less, and the pen point has an elliptic spherical shape. The fountain pen nib is characterized in that the elliptical spherical pen point is in contact with the writing surface by the elliptical spherical surface parallel to the minor axis when the fountain pen axis is written at a normal angle. 2. A fountain pen nib in which a curved writing part is integrally formed at the tip of the nib body and an ink groove is cut from the tip, and the width of the tip is 0.25 mm or less. In addition, the curved surface of the writing portion is formed into an elliptic sphere, and when writing is performed with the axis of the fountain pen at a normal angle, the writing portion of the elliptical sphere has an elliptical spherical surface parallel to its minor axis on the writing surface. A fountain pen nib characterized by contact.