JPH09216488A - Felt pen, ballpoint pen ink-cartridge and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components and attempt to improve the gripping properties and sealability by interlocking a cone to a barrel by injection molding, integrally molding to form a resin molding, and disposing a felt wick, an ink impregnating pad and rear cap by a normal method. SOLUTION: In the case of manufacturing a felt pen, a resin molding in which a cone 1 is interlocked to a thick and shorter barrel forming part 2 is integrally molded by selecting resin for obtaining slightly soft touch feeling of polyvinyl chloride or polyethylene and injection molding it. Thereafter, the part 2 is loosened, softened, and the part 2 is formed as the barrel 4 of the pen by orienting it while holding the rear end 3 of the part 2 in this state. Thereafter, a felt wick 5, a rear end cap 7 and ink impregnating pad are mounted by a normal method to complete the pen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can reduce the cost by reducing the number of felt pen and ballpoint pen core components, and further improve the airtightness by eliminating the connection between the ink storing parts. The present invention relates to a felt-tip pen, a ball-point pen core, and a manufacturing method thereof, which can prevent oxidation of ink and at the same time provide a felt pen with a hand-friendly feeling of molding by molding a barrel with a soft resin of the same quality as a cone. .

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional felt pen has four parts mainly consisting of a felt core 20, a cone 30 for inserting and fixing the felt core 20, a shaft 40 called a barrel, and a rear end cap 50. It consists of components.
In addition, as shown in FIG.
0, a metal chip 80 that holds a ball, and an ink storage portion 90 of a main body that stores ink.

[0003]

In the above-mentioned felt pen configuration, since the cone 30 and the barrel 40 are separate parts, it takes time and labor to assemble, and the cost increases accordingly, and moreover, from this connecting portion. Due to the airtight leak, problems such as the evaporation of the organic solvent, the inability of the ink to oxidize the ink due to the invasion of oxygen, the inability to write characters, and the discoloration are likely to occur. In addition, the main body of the barrel (shaft) 40 of the felt-tip pen is currently molded from a hard plastic material, and it becomes painful when used for a long time, so a soft rubber cover should be used to increase grip performance. It is wrapped and fitted. Therefore, the number of parts is increased, which causes a cost increase.

Since the ball-point pen core is connected by inserting a thin synthetic resin pipe into the metal tip 80, there is a problem that the cost is high as in the felt pen and that the ink is easily deteriorated due to airtight leakage from the connecting portion. there were.

Since the ball-point pen core is formed by inserting a thin synthetic resin pipe into the metal tip 80 and connecting them continuously, the cost is high as in the felt pen, and the ink is easily deteriorated due to airtight leakage from the connection portion. There was a problem.

The present invention has been made to solve the above-mentioned problems, and in a felt pen, the cone and barrel made of a soft resin material are integrated to reduce the number of parts. The ballpoint pen is made of synthetic resin pipes with a low friction coefficient and high mechanical strength to improve grip and airtightness. It is an object of the present invention to provide an integrally formed resin that can reduce the cost by rationalizing the assembling work and prevent the deterioration of the ink by strengthening the airtightness of the fitting connection portion.

[0007]

A felt-tip pen according to the present invention is a resin-molded article integrally molded in a state where a cone and a relatively short barrel are connected by injection molding. The product is the one in which the cone and barrel are integrated by stretching the barrel forming part while it is warmed and softened while sandwiching the rear end part, and the felt core, ink impregnated pad, rear cap, etc. are added to this by a conventional method. It is characterized by being arranged.

In the method of manufacturing the felt pen, a resin molded product in which a cone and a slightly thicker and shorter barrel forming portion are continuously formed is integrally molded by injection molding, and then the barrel forming portion is warmed and softened. In this state, the rear end portion is sandwiched and stretched to form an integral body of the cone and the barrel, and the number of points is reduced and the usability is excellent.

The ball-point pen core according to the present invention is a resin-molded product integrally molded in a state where a plastic chip and a slightly thick and short ink storage portion are continuously provided by injection molding. Is characterized in that the plastic container for accommodating the ball and the ink accommodating portion are integrated by stretching the ink accommodating / forming portion while it is warmed and softened while sandwiching the rear end thereof.

Further, in the method of manufacturing the ball-point pen core, a resin molded product in which a chip forming portion for forming a plastic chip and a slightly thick and short ink storage forming portion are continuously provided is integrally formed by injection molding. After the molding, the ink storage forming portion is warmed and softened, and the plastic tip for storing the balls by stretching while stretching the rear end portion while sandwiching the rear end portion is integrated with the ink storage portion.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of each component constituting the felt-tip pen according to the present invention, which is a resin molded product in a state where a cone 1 and a barrel forming portion 2 having a relatively thick wall and a short length are continuously provided. This resin molded product is formed integrally by injection molding by selecting a resin such as polyvinyl chloride resin or polyethylene that gives a slightly softer feel. Thereafter, the barrel forming portion 2 is warmed and softened, and in the softened state, the rear end portion 3 of the barrel forming portion 2 is sandwiched and stretched,
The barrel forming part 2 is formed as a barrel 4 of a felt pen, and as shown in FIG. 2, the cone 1 and the barrel 4 are formed integrally. Then, the felt core 5, the rear end cap 7, and the ink impregnated pad (not shown) are attached by a conventional method to form a felt pen.

According to the felt pen constructed as described above, the felt pen, the cone, the barrel, and the rear end cap 50 are the main components of the four parts as compared with the conventional four parts.
It is possible to reduce the number of parts of the cone 1, the barrel 4, and the rear end cap 7 to 3 parts. Since the barrel 4 portion is formed by stretching as described above, the oxygen barrier property is improved, the effect of preventing the oxidation of the ink inside is exhibited, and the use and service life are extended. As in the present embodiment, the cone 1 and the barrel 4 can be made to have a soft feel by using the soft resin as described above, and the barrel 4 can be made to have a soft feeling. There is no need for a separate member for softening the feel of the material.

FIG. 4 and FIG. 5 are sectional views showing the respective parts constituting the ball-point pen core according to the present invention.
In the present invention, a resin molded product in which a chip forming portion 8 for forming a plastic chip corresponding to a conventional metal chip and an ink storage forming portion 9 having a slightly thicker thickness and a shorter thickness are integrally connected. Has become. This resin molded product is, for example, integrally molded by injection molding using polyamide or the like having a small friction coefficient and easy to mold. Then, the ink containing portion 1 is warmed and softened, and in the softened state, the rear end of the ink containing portion 9 is sandwiched and stretched, whereby the ink containing portion 1 is formed.
0 is formed. Then, as shown in FIG. 5, the plastic chip 12 holding the ball 11 and the ink storage portion 10 are integrated to form a ballpoint pen core 13. Then, the ball-point pen core 13 is set on the outer shaft 14 to complete the ball-point pen. In the figure, 15 indicates a rear end cap.

According to the ball-point pen core constructed as described above, the plastic chip 12 and the ink storage portion 10 are compared with the conventional three-part main component consisting of the ball-point pen core body, the metal chip and the ball. It is possible to reduce the number of integrated 2 parts parts. Since the advantage formed by stretching the ink containing portion 10 is the same as that of the felt pen described above, detailed description thereof will be omitted.

[0015]

Since the present invention has the above-described structure, it is possible to reduce the number of constituent parts, which contributes to cost reduction and the economic effect thereof is increased.
Further, if a soft resin is selected as the material, the gripping feeling of the hand becomes flexible, and there is an advantage that rubber or the like is not required unlike the conventional case. In addition, since the resin component is integrally molded, airtightness leakage due to the continuous connection part, solvent vaporization, deterioration of ink due to oxidation, etc. can be prevented, durability, extension of usage period etc. It has many excellent advantages.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a felt-tip pen according to the present invention before being stretched.

FIG. 2 is a cross-sectional view of the stretched one shown in FIG.

FIG. 3 is a side view of a felt-tip pen according to the present invention.

FIG. 4 is a cross-sectional view of a ball-point pen according to the present invention before being stretched.

5 is a cross-sectional view of the stretched one shown in FIG.

FIG. 6 is a sectional view in which a part of the ball-point pen according to the present invention is cut away.

FIG. 7 is a cross-sectional view of a conventional felt pen.

FIG. 8 is a sectional view in which a part of a conventional ballpoint pen is cut away.

[Explanation of symbols]

 1 Cone 2 Barrel forming part 3 Rear end part of barrel forming part 4 Barrel 7 Rear end cap 8 Chip forming part 9 Ink storing part 10 Ink storing part 11 Ball 12 Plastic tip 13 Ball pen core

Claims (4)

[Claims] 1. A resin molded product integrally molded in a state where a cone and a relatively short barrel are continuously provided by injection molding, and the resin molded product is in a state where the barrel forming portion is warmed and softened. After that, the cone and barrel are integrated by stretching while sandwiching the end portion, and a felt core, an ink impregnated pad, and
A felt pen with a rear cap and the like. 2. A resin molded product in which a cone and a slightly thicker and shorter barrel forming portion are connected to each other is integrally molded by injection molding, and then the rear end portion is clamped while the barrel forming portion is warmed and softened. A method for manufacturing a felt-tip pen, wherein the felt pen is drawn while being stretched to form an integral body of a cone and a barrel. 3. A resin molded product integrally molded in a state in which a plastic chip and a slightly thicker and shorter ink storage unit are continuously provided by injection molding, and the resin molded product has an ink storage formation unit. By stretching while holding the rear end in the warmed and softened state,
A ball-point pen core in which a plastic chip for storing a ball and an ink storing portion are integrated. 4. A resin molded product in which a chip forming part for forming a plastic chip and a slightly thicker and shorter ink containing forming part are continuously formed by injection molding, and then the ink containing forming part. A method of manufacturing a ball-point pen core, wherein a plastic chip for accommodating a ball, which is stretched while sandwiching a rear end portion thereof in a warmed and softened state, is integrated with an ink accommodating portion.