JPH0872460A - Production of ball-point pen tip - Google Patents

Abstract

PURPOSE: To adjust the shape of the tip of a ball-point pen without distorting the same by holding the pipe made of a synthetic resin of an ink tank and applying grinding processing to the tip part of the ball-point pen while bending the pipe. CONSTITUTION: A pipe 2 made of a synthetic resin fitted with a ball-point pen tip 1 is held between a rubber roll 3a and a receiving roller 3b and rotated by a rotary machine. The grinding surface 4c of a grinder 4 is brought into contact with the ball-point pen tip 1 at the position bending the pipe 2 while the pipe 2 is rotated to apply grinding processing thereto. Even when the contact force of a grinding material is slightly excessive, it can be absorbed by the bending force of the pipe. Further, the contact force is regulated by the holding force of the pipe and the distance with the grinding material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION A ball pen tip formed by forming a reduced diameter portion and embracing a ball installed in an inner hole has a tip portion including the reduced diameter portion, which is subjected to polishing, and the outer shape of the tip portion. The present invention relates to a method for manufacturing a ball-point pen tip having a smooth curved shape.

[0002]

2. Description of the Related Art Conventionally, in order to hold a ball of a metal ball pen tip such as brass, nickel silver, stainless steel, copper alloy, aluminum alloy, etc., a center hole of the ball pen tip and a ball holding chamber. After forming the internal structure such as by cutting, etc., the ball is installed in the ball holding chamber, and the tip of the ball pen tip is caulked to form a reduced diameter portion to form the ball. There is known a ball-point pen chip that holds a part of a ball while holding it.

At the tip portion of the ball-pen tip as described above, there are not a few corner portions of the outer shape, fine processing lines, scratches, burrs, etc. formed by cutting or caulking for forming the outer shape. is there. All of these things become a catch on the writing surface such as paper surface,
Not only does it increase the frictional resistance during writing, but it also damages the surface to be written, and there is the problem that handwriting is disturbed by ink penetration into the damaged area. It has been desired to form the outer shape of the tip portion that is likely to come into contact with a smooth curved shape.

Conventionally, a so-called polishing process has been performed in which the surface of a ball-pen tip is coated with a fine abrasive such as powder of chromium oxide or silicon carbide applied to a cloth such as felt or cotton, and the relative movement is carried out while abutting it. It was

[0005]

It can be said that the polishing process is to relatively move two or more things while abutting them and finely scrape away the material to be polished by the friction between the two. The abrasives that are also undergoing scraping. If the abrasive is used for a long period of time, the part used (the part that comes into contact with the material) is scraped, and if the absolute position of the abrasive is determined, the abrasive does not come into contact with the material to be processed.
Also, for those that determine the relative position with respect to the material to be processed, the life of the abrasive is short because it abuts with a minimum force that abuts the material in the state of a new abrasive, and
There is a risk that the tip portion of the ball-point pen tip will be distorted if it is brought into contact with an excessively strong force, and there is a problem in terms of work efficiency due to the necessity of making delicate adjustments according to the variations of the ball-point pen tips.

[0006]

SUMMARY OF THE INVENTION That is, according to the present invention, a tip portion including a reduced diameter portion of a ball pen tip having a reduced diameter portion and holding a ball installed in an inner hole is ground. In a method for manufacturing a ball-point pen tip, which is obtained by processing and forming the outer shape of the tip portion into a smooth curved shape, a synthetic resin pipe as an ink tank is connected to the ball-point pen tip, and the synthetic resin pipe is held. The ball-pen tip is rotated by rotating the ball-point pen tip, and at the same time the synthetic resin pipe is bent, an abrasive is brought into contact with the tip portion, and the portion is polished. The gist is the manufacturing method of the rupen tip.

[0007]

According to the method of manufacturing the ball-pen tip of the present invention, since the synthetic resin pipe as an ink tank is held and the synthetic resin pipe is bent, the tip portion of the ball-pen tip is subjected to polishing processing. Even if the abutting force of the abrasive material to be abutted against is somewhat excessive, the excessive amount of the abutting force can be absorbed by the bending amount of the synthetic resin pipe. Further, the delicate adjustment of the contact force can be easily and surely adjusted by adjusting the distance between the holding position of the synthetic resin pipe and the abrasive.

[0008]

Embodiments will be described below with reference to the drawings. As shown in FIG. 1, a rotating machine 3 for rotating a synthetic resin pipe 2 to which a ball pen tip 1 is attached and a polishing machine 4 having an abrasive 4a for polishing the tip 1a of the ball pen tip 1 are used. The rotating machine 3 is a synthetic resin pipe 2.
Roller 3a and receiving roller-3 for imparting rotational force to the
b, and these rubber rolls 3a and receiving rolls
The synthetic resin pipe 2 is held between the la-3b and the la-3b. Here, in order to make it easier to rotate the synthetic resin pipe 2, the rubber roll 3a has a contact surface 3c with which the synthetic resin pipe 2 is abutted, and a ridge or protrusion is formed in a direction parallel to the longitudinal direction of the synthetic resin pipe 2. Can be formed to increase the coefficient of friction. Further, in order to prevent the surface of the synthetic resin pipe 2 from being damaged on the contact surface 3e of the receiving roller-3b with respect to the synthetic resin pipe 2, a synthetic resin sheet or cloth is attached or the receiving roller 3b is attached. La-3b itself can be formed of synthetic resin.

The polishing machine 4 has a polishing material 4a which rotates about a rotary shaft 4b to bring the side polishing surface 4c into contact with the material. The polishing surface 4c is formed of a cloth such as felt or cotton, a fiber converging body such as cotton or silk, or leather such as deer leather or cow leather. The ball pen tip 1 is rotated while rotating.
A ball pen tip 1 that increases friction resistance at the time of writing by abutting against a writing surface such as a corner portion formed on the outer shape of the ball-pen tip 1 or fine processing lines or scratches or burrs, It is removed to form a smooth curved surface. Here, if a polishing agent such as fine powder of chromium oxide, silicon carbide, aluminum oxide or diamond powder is applied to the polishing surface 4c, the polishing effect can be efficiently obtained.

The contact position of the abrasive 4a with the ball-point pen tip 1 is displaced from the position where the rotary machine 3 holds the synthetic resin pipe 2 described above. By doing so, the synthetic resin pipe 2 is bent. In order to adjust the bending amount, a large bending amount is required by adjusting the distance between the position where the rotary machine 3 serving as the fulcrum holds the synthetic resin pipe 2 and the contact position of the abrasive 4a with the ball-pen tip 1. In that case, the distance may be increased, and if a small amount of bending is required, the distance may be reduced.

In the rotation direction A of the abrasive 4a indicated by the arrow in the drawing, when polishing is performed from the synthetic resin pipe 2 side of the ball-pen tip 1 toward the tip 1a side, the powdery abrasive is blown. It is preferable in that it is difficult for the rupen tip to enter the inner hole. Further, as shown in FIG. 2, when the rotary shaft 4b is displaced 90 degrees from that of FIG. 1 and polishing is performed in a direction perpendicular to the longitudinal direction of the ball-point pen tip 1, the durability of the abrasive is improved and the life is increased. Is preferable in that it becomes longer.

[0012]

As described above, according to the method for manufacturing a ball-point pen tip of the present invention, even if the abrasive is used for a long period of time, it is possible to suppress the abrasion of the abutting portion with the material as much as possible.
The shape of the tip portion of the ball-point pen tip is not distorted, variations in individual ball-point tips are absorbed, and delicate adjustments can be made easily.

[Brief description of drawings]

FIG. 1 is a processing explanatory view showing an example.

FIG. 2 is an enlarged view of a main part showing another example.

[Explanation of symbols]

 1 Ball Pen Tip 1a Tip Part 2 Synthetic Resin Pipe 3 Rotating Machine 3a Rubber Roll 3b Receiving Roller 3c Contact Surface 3e Contact Surface 4 Polishing Machine 4a Abrasive Material 4b Rotating Shaft 4c Polishing Surface

Claims (1)

[Claims] 1. A ball pen tip formed by forming a reduced diameter portion and embracing a ball installed in an inner hole, has a tip portion including the reduced diameter portion, which is polished to smooth the outer shape of the tip portion. In a method for producing a ball-pen tip formed in a curved line, the ball-pen tip is formed by connecting a synthetic resin pipe as an ink tank to the ball-pen tip, and holding and rotating the synthetic resin pipe. A method for manufacturing a ball-point pen tip, which comprises rotating an elastic member and bringing an abrasive material into contact with the tip portion at a position where the synthetic resin pipe is bent, and polishing the portion.