JPH068687A - Method for manufacturing ball-pen tip - Google Patents

Abstract

(57) [Summary] [Structure] The protruding portion of the ball 2 held by the ball holding portion 4 of the ball pen tip 1 from the ball pen tip 1 is in contact with the ball. -Pressing is performed by a pressing pin 3 formed with a spherical ball contact recess 7 having substantially the same shape as the ball, and the bottom wall 5 of the ball holding portion 4 is pressed by the ball 2, A spherical ball that is deformed to have the same shape as the ball.
A method for manufacturing a ball-point pen tip for forming the ball receiving seat 6. [Effect] It is possible to suppress the deformation of the ball and the chipping of the ball, improve the durability of the pressing pin, and obtain a ball-point pen tip of stable quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The metallic ball-pen tip holding a ball holds a bottom of the ball-holding portion by applying a pressing force to the tip of the ball protruding from the ball-pen tip by a pressing pin. The present invention relates to a method for manufacturing a ball pen tip, in which a spherical ball receiving seat portion is formed on a wall by press deformation.

[0002]

2. Description of the Related Art A hole portion including a ball holding portion of a metal ball pen tip is generally formed by a cutting process. After the cutting process, an infinite number of cutting marks are formed on the surface of the inner wall of the ball pen tip. Are formed, and there is a so-called rough state with many fine irregularities. When the inner wall of the ball-pen tip is thus rough, smooth rotation of the ball is hindered. In view of this point, conventionally, a ball pen tip manufacturing method for forming a ball receiving seat portion by pressing a ball with a pressing pin, the shape of the ball is copied to the ball receiving seat portion,
A ball receiving seat portion having a shape substantially the same as that of the ball is formed so that the ball is positioned to some extent during writing, and the surface of the contact portion between the ball receiving seat portion and the ball The purpose was to make the condition better than immediately after cutting. Further, in this method, since the contact portion of the pressing pin that contacts the ball is a flat surface, it contacts the ball at a point or in a state close to the point.

[0003]

In the method as described above, the pressing force is concentrated on one point of the ball, so that the ball is pressed.
There has been a problem that deformation of the ball and a phenomenon that part of the ball is chipped occur. Further, similarly, since the force concentrates on one point at the contact portion of the pressing pin, there is a problem in durability of the pressing pin. Further, variations occur in the contact position between the ball and the pressing pin, and the amount of protrusion of the ball from the tip of the ball pen tip and the dimensions of the ball receiving seat and the like vary.
There is a problem that a ball-point pen tip of stable quality cannot be obtained.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a pressing pin is used to apply a pressing force to a tip portion of a ball projecting from a ball pen tip of a metallic ball pen tip holding a ball, and a ball is applied to the ball tip. In a method of manufacturing a ball pen tip, wherein a spherical ball receiving seat portion is formed on a bottom wall of a ball holding portion by pressing deformation, an abutting concave portion for abutting the ball is formed on a pressing surface of the pressing pin. The gist is a method for manufacturing a ball-point pen tip, which is characterized by the above.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Detailed description will be given below with reference to the drawings. In each of the embodiments, basically the same parts are designated by the same reference numerals.

Reference numeral 1 is a metal ball-pen tip,
Reference numeral 2 is a metal ball, and 3 is a ball pressing pin. The ball 2 is held by the ball holding portion 4 of the ball pen tip 1. With this ball pen tip 1 and ball 2,
The writing section of Lupen is constructed. The pressing pin 3 is moved in the direction of the arrow (direction A in the drawing) to press the ball 2, and the bottom wall 5 of the ball holding portion 4 is pressed by the ball 2 to deform and press the ball. The spherical ball receiving seat portion 6 having substantially the same shape as the above is formed.

Here, as shown in FIG. 2, a spherical ball contact recess 7 having substantially the same shape as the ball is formed in the portion of the pressing pin 3 that contacts the ball. . Push pin 3
In contact with the ball 2, the ball 2 and the pressing pin 3 are contacted by apparent upper surface contact. Thereby, the pressing force of the pressing pin 3 can be efficiently transmitted to the ball 2. Therefore, the pressing force is not concentrated and deformation or breakage of the ball is suppressed, and the durability of the pressing pin 3 is improved. Further, since the ball 2 can be positioned with respect to the pressing pin 3 by the contact recessed portion 7, if the positional relationship of the ball pen tip 1 with respect to the pressing pin 3 is managed, the ball pen tip 1 is formed with a ball. -The position of the lever receiving seat 6 can be managed.

The abutting recess 7 of the pressing pin 3 is a spherical recess that makes surface contact with the ball 2 as shown in the drawing.
It is also possible to form a conical recess that makes a circumferential line contact with the ball 2.

The ball receiving seat portion 6 of the ball-point pen tip 1 formed by such a method is once excessively pressed and deformed by the ball, and then slightly restored by the elastic force of the metal. The ball 2 and the ball receiving seat 6 are in line contact with each other. In the case of a low-viscosity ink such as an aqueous ball-pen ink having a viscosity of 2 to 5 centipoise, the ball 2
When the ball receiving seat portion 6 and the ball receiving seat portion 6 are in line contact with each other, the movement of ink in the ball holding portion 4 becomes smooth, and the writing feeling is improved.

It is also possible to press the ball 2 while rotating the pressing pin 3 in the embodiment of FIG. 1 in the circumferential direction of the ball pen tip 1 (direction of arrow B in FIG. 1) by appropriate means. Since the ball 2 also rotates in conjunction with the rotation of the pressing pin 3, the ball receiving seat 6 is given a rotational force in addition to the pressing force. By fixing the ball pen tip 1 so as not to rotate, the ball receiving seat 6 is attached and worn by rotation. As a result, the ball receiving seat 6
The elastic force of the metal described above is suppressed in the contact portion with the ball 2, so that the restoration after pressing is less likely to occur. Therefore, the ball 2 and the ball receiving seat 6 are brought into surface contact by this processing.

A ball in which the ball and the ball receiving seat are in surface contact with each other.
Rupen tips are good for inks with high viscosity such as oil-based ball-pen inks having a viscosity of 6000 to 10000 centipoise. In the case of ink having a relatively high viscosity, such as oil-based ball-pen ink, when the ball and the ball receiving seat are in line contact with each other, the ink film is separated and the ball and the ball are separated from each other. The contact between the metal and the seat part gives the user a feeling of writing when writing. In addition, the amount of ink that is transferred onto the surface of the paper by riding on the ball is reduced, and the ink followability becomes poor during writing. As a result, the amount of ink that is transferred to the surface of the paper by riding on the ball is reduced, and the writing line is blurred. According to this embodiment, the ball 2 and the ball
An ink film is formed in a minute gap between the two while being in surface contact with the ball receiving seat portion 6, a large amount of ink can be placed on the ball, and the ink followability during writing is improved.

Here, as shown in FIG. 3, the rotational force applied to the ball is rotated in the direction perpendicular to the rotational force in the circumferential direction (direction of arrow C in the drawing) (direction of arrow D in the drawing). You can also apply power. Specifically, as shown in FIG. 4, the pressing pin 3 is not provided with a cylindrical contact body 9 in which a ball contact recess 7 is formed on the body portion 8 over the entire circumference thereof. The ball contact recess 7 is brought into contact with the ball 2 so that the entire circumference of the ball contact recess 7 comes into contact with the ball 2 while pressing the ball 2 against the ball receiving seat 6. Then, the contact body 9 is rotated, and further the entire pressing pin is rotated in the circumferential direction with respect to the ball pen tip 1.

The shape of the ball receiving seat portion 6 obtained by applying the rotational force as described above is shown in FIGS. 3 and 5 which is an enlarged view of the I portion of FIG. Ball receiving seat 6 that abuts the ball 2
A minute wear mark is formed on the end portion 10 due to adhesive wear, and a minute protrusion 11 is formed on the end portion 10 as an escape portion for strain due to plastic deformation.
Is formed. The protrusion 11 further increases the contact area between the ink and the ball, holds the ink film, smooths the rotation of the ball, and improves the ink followability. be able to.

In the above, the ball-point pen tip 1, the ball
Various metals can be used for the rule 2 and the pressing pin 3, but alloys such as stainless steel and nickel silver are often used. Specifically, an iron alloy containing 20% of chromium and 2% of molybdenum is adopted as the ball-pen tip, and the ball is
There is one that employs a tungsten carbide alloy containing 10% of cobalt. Further, the ball pen tip 1, the ball 2, and the pressing pin 3 have a relationship with the ball rather than the pressing pin.
It is preferable that the ball is hard and the ball is harder than the ball pen tip.

[0015]

INDUSTRIAL APPLICABILITY The present invention relates to a metallic ball holding a ball.
A ball which forms a spherical ball receiving seat portion by pressing deformation on the bottom wall of the ball holding portion by applying a pressing force to the tip of the ball pen tip protruding from the ball pen tip by a pressing pin. -In the method for manufacturing the pen tip, since the contact surface is formed on the pressing surface of the pressing pin so as to contact the ball, deformation of the ball and chipping of the ball are suppressed, and the pressing is performed. The durability of the pin can also be improved,
The ball pen tip of stable quality can be obtained by minimizing the variation in the dimensional accuracy of the ball from the ball pen tip and the ball receiving seat.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the present invention.

FIG. 2 is a perspective view showing a member used in the present invention.

FIG. 3 is a cross-sectional view showing another example of the present invention.

FIG. 4 is a perspective view showing a member.

FIG. 5 is an enlarged sectional view of an essential part of a member manufactured according to the present invention.

[Explanation of symbols]

 A Arrow indicating the direction of rotation B Arrow indicating the direction of rotation C Arrow indicating the direction of rotation D Arrow indicating the direction of rotation I Main part 1 Ball Pen tip 2 Ball 3 Pressing pin 4 Ball holding part 5 Bottom wall 6 Bolt -Rail receiving seat 7 Ball contact recess 8 Body 9 Contact body 10 End 11 Projection

Claims (1)

[Claims] 1. A pressing force is applied by a pressing pin to a tip portion of a ball protruding from a ball pen tip of a metallic ball pen tip holding a ball, and a bottom wall of the ball holding portion is applied. A ball pen tip manufacturing method for forming a spherical ball receiving seat portion by pressing deformation, characterized in that an abutting concave portion for abutting the ball is formed on a pressing surface of the pressing pin. Lupen tip manufacturing method.