JPH08207483A - Ball-point pen body - Google Patents

Abstract

PURPOSE: To obtain a ball-point pen body which does not deteriorate fresh handwriting and consumes a good deal of ink by specifying the longest part of an ink passage in the longitudinal direction and the diameter of a central hole and contacting the end of an ink transfer core with the opening of the ink passage. CONSTITUTION: A writing implement A has a shaft body 3 in which a ball-point pen chip 2 having a ball is fixed at the end, an ink occulusion body 4 for occuluding water base ink is placed in the shaft body 3, and the ink in the occulusion body 4 is oozed and supplied to the end of the chip 2 through an ink transfer core 5. In the chip 2, an inward protruding part 10 is formed in the inner hole to form an ink passage 13 comprising a central hole 13a and radial grooves 13b. The longest part of the passage 13 in the longitudinal direction is made 50% or less of the diameter of the ball, and the diameter of the hole 13a is made 45% or less of that of the ball. The end of the core 5 is brought into contact with the opening of the passage 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballpoint pen body for supplying ink contained in an ink occluding body to a ballpoint pen tip by an ink relay core, the inner penetrating portion of which is formed in the inner hole of the ballpoint pen tip. The present invention relates to a device provided with an ink passage consisting of holes and radial grooves.

[0002]

2. Description of the Related Art As a means for holding ink in a main body, synthetic fibers such as polyethylene fibers, acrylic fibers, polyester fibers, polyamide fibers and polyacetal fibers, and bundles of natural fibers such as animal hair and cotton are used. As a means for supplying ink into the ballpoint pen tip using an ink occlusion body, a bundle of synthetic fibers or natural fibers, a sintered core of polyethylene resin, polyvinylidene fluoride resin, etc., polyacetal resin, polyamide resin, acrylic A ballpoint pen body using an ink relay core made of a synthetic resin rod-shaped object having a communication hole such as a resin or ABS resin rod is mainly used as an ink and has a low viscosity (about 10c).
It is suitable for use with water-based inks of ps or less). Ballpoint pens that use such water-based inks are often used because they have a relatively low amount of ink discharge due to their low viscosity, and fresh handwriting can be obtained with a smooth writing feel.

Even with the above-mentioned ball-point pen body, a fresh and abundant ink ejection amount cannot be obtained only by using a low-viscosity ink. In general, such water-based ink has almost no spinnability as is found in oil-based inks for ballpoint pens, and the action of ejected ink pulling subsequent ink is weak. Therefore, the gap between the tip opening of the ballpoint pen tip and the ball is adjusted, and the capillary force of the ball holding part, the ink relay core, the ink occlusion body, etc. is adjusted. It can be said that it is important that the ink is ejected, that is, the member through which the ink flows in the ball-point pen body does not hinder the large-scale ejection of the ink.

Securing a certain distance as a space between the tip of the ink relay core and the ball holding chamber seems to be disadvantageous in terms of direct ink supply from the ink relay core to the ball holding chamber. There is no increase in the capillary force due to the pressure contact of the tip of the relay core, and an ink reservoir rich in ink is formed in the vicinity of the ball holding part that accommodates the ball as a writing member. It can be said that it is advantageous in terms of ink supply. In this way, it can be said that the ink passage formed in the inward protruding portion having the ball receiving surface of the ball holding chamber has a relatively large volume. Specifically, the length l'of the outermost portion of the ink passage is approximately 50% to 80% of the ball diameter.
The diameter of the central hole of the ink passage is set to 50% to 60% of the ball diameter.

[0005]

However, the conventional ballpoint pen body as described above has a problem in the consumption rate of the ink contained in the ink storage body. That is, since the ink occlusion body and the ink relay core have the ink holding ability by themselves such as the fiber converging body as described above, it is practically impossible to consume all the stored ink as handwriting. However, if a portion with a very small capillary force is formed between the ink relay core and the ball holding portion with a relatively large volume, the continuous flow of ink is suppressed and the ink moves in the movement path of the ink. Will form a part that can exist in a free state, the amount of ink supplied to the ball holding chamber tends to be unstable, and even if a large amount of ink remains in the ink storage body, the handwriting may be blurred or the handwriting may be There are problems such as broken lines and the phenomenon that writing becomes impossible. In particular, when the amount of ink in the ink occlusion body has decreased, the above-mentioned problem tends to be remarkable,
In many cases, less than 70% of the ink contained in the ink occlusion body was used as handwriting.

[0006]

That is, the present invention is a ball-point pen body for supplying ink contained in an ink storage body to a ball-point pen tip by an ink relay core, wherein an inward projection is provided in an inner hole of the ball-point pen tip. Which is provided with an ink passage consisting of a central hole and radial grooves,
The longest part of the ink passage in the longitudinal direction is 50% or less of the ball diameter, the diameter of the central hole is 45% or less of the ball diameter, and the tip of the ink relay core is at the opening of the ink passage. The gist is a ballpoint pen body that is in contact with.

[0007]

The ballpoint pen body of the present invention has a relatively high capillary force in the ink passage, and the tip of the ink relay core is positioned as close to the ball holding chamber as possible so that the ink released from the ink relay core is immediately removed. You can lead to the ball holding room for writing. As a result, a stable and continuous flow of ink is formed from the ink occlusion body to the ink relay core to the ink passage to the ball holding chamber, and a ballpoint pen body with a high consumption rate of ink stored in the ink occlusion body is maintained without damaging the fresh handwriting. Is what you can get.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example will be described below with reference to the drawings.
The ball-point pen A of the present invention shown in FIG. 1 is shown as an example of a refill for a so-called writing instrument that is used by being housed in an exterior body of the writing instrument. The writing instrument A includes a ballpoint pen tip 2 having a ball 1 as a writing member, a shaft body 3 having the ballpoint pen tip 2 fixed to a tip portion 3a, and an ink occlusion body 4 housed in the shaft body 3 and occluding an aqueous ink.
And an ink relay core 5 in which a rear end portion 5a is embedded in the ink occlusion body 4 for ink connection, and a rear end opening portion 3 of the shaft body 3.
It consists of a hard polyethylene tail plug 6 fitted in b. Here, the ink relay core 5 is inserted into the ballpoint pen tip 2 and fixed by caulking the rear end of the ballpoint pen tip. In addition, the ink occlusion body 4 is
2 is a cross-sectional view taken along the line I-I of FIG. 1 in which acrylic resin is welded with a solvent to form a convergent body, the side surface of which is wound with a polyester film 20 to form a cylindrical shape.
As shown in FIG. 3, in order to form the air flow passage 7 on the polyester film 20, a synthetic resin rod 8 is arranged so as to extend over the entire length in the longitudinal direction of the ink occlusion body, and another sheet is placed from above. The polyester film 21 of is wound. In addition, in this figure, the polyester films 20 and 21 are schematically shown in an emphasized manner for easy understanding.

FIG. 3, which is an enlarged cross-sectional view of the main part of FIG. 1, shows the inside of the ballpoint pen tip 2. The inner hole 9 of the ball-point pen tip 2 has a ball holding chamber 11 and an ink relay core accommodating portion 12 formed by an inward projecting portion 10.
The ball holding chamber 11 is formed by the ink passage 13 formed in 0.
And the ink relay lead storage portion 12 communicate with each other. The ink passage 13 has a central hole 13a and a radial groove 13b, and both the central hole 13a and the radial groove 13b are in the ball holding chamber 11
Also, the ink relay core accommodating portion 12 is opened.

The ball holding chamber 11 has a ball receiving portion 14 in which the ink passage 13 is opened. Here, the inward protruding portion 10 forming the ball seat portion 14 is formed in a taper shape such that the outermost portion has the largest thickness and becomes thinner toward the center. Therefore, the outermost portion of the ink passage 13 is the longest portion 15 in the longitudinal direction, and the center hole portion is the shortest portion in the longitudinal direction. The taper angle α of the ball seat portion 14
Is preferably set in the range of 100 ° to 150 °. This is because when the taper angle α is less than 100 °, the ball seating portion sandwiches the ball and hinders rotation of the ball. When the taper angle α exceeds 150 °, the outermost contour of the ball holding chamber 11 is formed. This is because a relatively large space is formed in the portion, the ink holding capacity of the ball holding chamber is reduced, and problems such as ink leakage and ink shortage are likely to occur.

The ink relay lead accommodating portion 12 has a tapered wall 16 that widens toward the rear portion (downward in the drawing). The tip end side of the ink relay core 5 is ground in a tapered shape, and the inward protruding portion 10 of the ballpoint pen tip 2 is formed.
An abutting portion 17 and a tapered surface portion 18 that come into contact with the opening 13c of the ink passage 13 formed in the above are formed.

Here, the relationship between the taper angle β of the tapered wall 16 of the ink relay core accommodating portion 12 and the taper angle γ of the taper surface portion 18 of the ink relay core 5 is preferably β ≧ γ. This is because when β is smaller than γ, the tip of the ink relay core 5 does not come into contact with the opening 13c of the ink passage 13.

In the illustrated example, the relation between β and γ is shown as β> γ, but by doing so, β
And / or even if the value of γ varies in manufacturing, the ink relay core 5 and the opening 13c of the ink passage 13 are surely brought into contact with each other, and the ink supply to the ink passage 13 is not hindered.

Further, the contact portion 19 for the ink relay core 5, which is the surface of the inward protruding portion 5 on the ink relay core accommodating portion 12 side.
Has a diameter slightly larger than that of the contact portion 17 of the ink relay core 5 so as not to hinder the ink flow through the ink relay core 5, and the tapered wall 16 of the ink relay core accommodating portion 12 allows the ink relay core to be conveyed. This is preferable since it is possible to prevent the contact portion 17 and 19 of the ink relay core accommodating portion 12 and the ink relay core 5 from being separated from each other by pushing 5 toward the ink occlusion body 4 side.

Next, the relationship between the ball diameter D, the length 1 of the longest longitudinal portion 15 of the ink passage 13 and the diameter s of the central hole 13a will be shown. The length 1 of the longest part 15 in the longitudinal direction is 5 of the ball diameter.
It should be 0% or less. Considering the risk that the fibers of the ink relay core 5 enter the ball holding chamber and hinder the rotation of the ball, it is preferably 30% or more of the ball diameter D. The diameter s of the central hole 13a needs to be 45% or less of the ball diameter D (s> 0).
The lower limit of s may vary depending on the ink used,
It can be the minimum value that can be processed. Table 1 shows the results of investigating the consumption rate of the ink contained in the ink occlusion body by making ball-point pen tips having different values of 1 and s, performing a writing test as a ball pen body.

[0016]

[Table 1]

In the result of the writing test, the ink consumption rate of 70% or more was able to be written in a good handwriting state of 1600 m or more without causing blurring of the handwriting or cutting of the handwriting.

Test conditions Ballpoint tip material: Stainless steel Ball material: Carbide Ink storage material: Acrylic fiber Porosity of ink storage material = 84% Total length of ink storage material: 82.5 mm Diameter of ink storage material: 5.5 mm Ink relay Core: Polyester fiber Porosity of ink relay core: 51% Total length of ink relay core: 34.5 mm Diameter of ink relay core: 1.5 mm Ball diameter D: 0.6 mm Tapered angle α of ball seat α: 120 ° Taper angle β of the taper wall of the ink relay lead storage part: 35
° Ink relay core taper angle γ: 31 ° Ballpoint pen tip opening diameter: 0.580 mm Gap between tip opening of ballpoint pen tip and ball: Average 20 μm Number of radial grooves: 5 Writting tester: WRITING TESTER MODE
LTS-4C-10 (manufactured by Seiki Kogyo Laboratories) Writing angle: 70 ° Writing load: 80 g Writing speed: 11 cm / s Ink used: Water-based dye ink (black) Ink viscosity: 3.9 cps (25 ° C) Before writing test Ink filling amount: 1.4g Room temperature: 20 ° C Humidity: 60%

As for the method for producing the ball-point pen tip used in the ball-point pen body of the present invention, an appropriate processing method such as rolling or cutting can be adopted.
When manufacturing the longest longest part 15 of 3 having a short length l, some caution is required. That is, the ball holding room 1
When the ink passage 13 is punched out by the cutting blade after forming 1 and the ink relay core accommodating portion 12, the formed ball holding chamber 11 and / or the ink relay core accommodating portion 12 is formed.
When the center of the ink is deviated from the center of the ball-point pen tip 2, a portion having a different thickness is formed on the inward protruding portion 10, and when the cutting blade for forming the ink passage 13 is applied, the inward protruding portion 1
It is possible that 0 will tilt. When the inward protruding portion 10 is inclined, the ball 1 does not rotate uniformly during writing, and the handwriting quality such as the ink discharge amount, the handwriting width, and the handwriting density varies depending on the writing direction. Therefore, after the ink passage 13 is formed, the center of the ball-point pen tip 2 and the cutting blade whose center is aligned with each other are used to form a ball.
A finishing cutting process is performed on the seat 14 and the side wall of the ball holding chamber 11. By doing so, the center of the ball holding chamber 11 can be aligned with the center of the ballpoint pen tip 2.

[0020]

INDUSTRIAL APPLICABILITY As described above, the ballpoint pen body of the present invention can provide a ballpoint pen body having a high consumption rate of the ink contained in the ink storage body without impairing the fresh handwriting.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment.

FIG. 2 is a sectional view taken along the line II of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of FIG.

[Explanation of symbols]

 A Ballpoint pen body 1 Ball 2 Ballpoint pen tip 3 Shaft body 3a Tip part 3b Rear end opening part 4 Ink storage body 5 Ink relay core 5a Rear end part 6 Tail plug 7 Air flow passage 8 Rod-like object 9 Inner hole 10 Inward protruding part 11 Ball holding chamber 12 Ink relay core accommodating portion 13 Ink passage 13a Central hole 13b Radial groove 13c Opening portion 14 Ball receiving portion 15 Longest longest portion 16 Tapered wall 17 Abutting portion 18 Tapered surface portion 19 Abutting portion 20 Polyester film 21 Polyester film

Claims (1)

[Claims] 1. A ball-point pen body for supplying ink contained in an ink occluding body to a ball-point pen tip by an ink relay core, wherein an inner projecting portion is formed in an inner hole of the ball-point pen tip, and a center hole and a radial groove are formed. In the ink passage core, the longest portion in the longitudinal direction of the ink passage is 50% or less of the ball diameter, the diameter of the central hole is 45% or less of the ball diameter, and the ink relay core is formed. The ball-point pen body, wherein the tip of the ink is in contact with the opening of the ink passage.