WO2001051293A1 - Ball-point pen - Google Patents

Abstract

A ball-point pen, comprising therein a writing ball (2), a pen point having an ink hole (1d) inducing ink (6) from the rear end side of the pen, an ink storage tube (9) storing the ink (6), a channel groove (1c) formed of a plurality of grooves communicating a support seat (1b) with the ink hole (1d), and an elastic body (3) installed so as to press the writing ball at the tip of the pen always directly or through a movable member provided therebetween, wherein the writing ball (2) rotatably loose-fitted in the state of being extruded from the tip of a tip (1) is limited to move forward and backward by a crimp (1a) by crimping and by the support seat (1b), respectively, whereby a relational expression M<F is satisfied where a writing ball pressing force of the elastic body (3) is F (g) and the total weight of the ball-point pen including a refill is M (g).

Description

 Description Bonolein Technical Field

 The present invention relates to a ballpoint pen provided so that a writing ball is always pressed by an elastic body so as to be in close contact with a crimping inner surface on a tip end side, and the tip end ball functions as a valve for preventing ink leakage. Background art

 Heretofore, oil-based ball-point pens, water-based ball-point pens, and neutral ball-point pens have been used as ball-point pens.

 Here, the oil-based ballpoint pen is one in which high-viscosity (about 10,000 cp) ink containing a higher alcohol solvent as a main solvent is directly stored in an ink storage tube. In addition, the water-based ballpoint pen is made by keeping an extremely low-viscosity (2 to 3 cp) ink containing water as a main solvent on a fiber bundle core called batting. Further, the neutral ball-point pen uses a medium-viscosity ink having a viscosity between oiliness and water-based and a so-called gel ink provided with pseudoplasticity.

 However, regardless of the type of ballpoint pen that used any type of ink, a common defect that could not be seen during writing was confirmed during storage without writing.

 Specifically, in a knock-type ball pen, the pen tip protrudes downward without storing the pen tip, or in a cap-type ball pen, the pen tip faces downward without capping. When stored in a pen stand or the like in a protruding state, there have been confirmed problems such as the ball valve at the pen tip opening, ink leaking out, and the pen tip drying out making writing impossible.

 SUMMARY OF THE INVENTION It is an object of the present invention to improve a ballpoint pen, which is a popular ballpoint pen, in which a ball serving as a writing portion protrudes from the tip of the penpoint and is loosely fitted so as not to come off.

Specifically, when the pen tip is facing down and the ball is stored on a pen stand with the ball exposed, ink leakage from the pen tip is prevented, and writing is not possible due to dry-up. The goal is to provide ballpoint pens that prevent problems. Disclosure of the invention

 In order to achieve the above-mentioned object, the invention described in claim 1 of the present invention is characterized in that a writing ball rotatably fitted so as to protrude from the tip of a chip is attached to a tip of the writing ball. The back end is controlled by the receiving seat to move forward and backward, respectively.The writing ball, the pen tip having an ink hole for drawing out ink from the rear end, and the ink are stored inside. An ink storage tube, a channel groove composed of a plurality of grooves communicating the receiving hole with the ink hole, and an elasticity installed so as to always or directly press the writing ball at the end of the writing ball via a movable member. In a ball-point pen having a body, the relational expression: M × F is added between the writing ball pressing force F (g) of the elastic body and the ball pen total weight M (g) including the refill. It is characterized by having.

 As a result, the writing ball is pressed to the tip side by the elastic body, and the writing ball is pressed even when the ball point is set in a state where the pen tip is directed downward and the ball is exposed and stored in a pen stand or the like. Since it functions as a ball valve, it is possible to prevent ink from leaking from the pen tip, and further to prevent writing failure due to dry-up. Here, F is the writing ball pressing force at the time of mounting.

 Further, as in the invention described in claim 2, when F is a value at the time of assembling to a ball-point pen and the relationship between M and F is 1.3 M and FM, the temporal element is It was found that the above effects could be obtained stably even when added.

 Further, as in the invention described in claim 3, when F is a value at the time of use for a ballpoint pen, if the relationship between M and F is 1.2 M <F, then at the time of use, It is possible to prevent ink from leaking from the pen tip or writing failure due to dry-up.

 The invention described in claim 4 is characterized in that the caulking is performed such that the inner diameter portion of the tip of the tip presses the writing ball during the caulking.

 In this way, a sealing surface of a constant width having substantially the same curvature as that of the writing ball is formed on the inner surface of the tip end by caulking. Therefore, when the writing ball is used as a ball valve, the sealing can be reliably performed.

 In the invention according to claim 5, the joint member is located between the tip and the refill,

Replacement form (Rule 26) When the tip is positioned vertically with the tip end down, a check ball located at the rear end of the tip to block the passage to the tip and prevent the ink being refilled from flowing into the tip is inserted into the joint member. It is characterized by being provided in.

 In this way, when the ball-point pen is set up so that the tip faces downward, ink is less likely to flow to the tip side, further preventing ink leakage from the pen tip and preventing writing by dry-up. Can be prevented. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a longitudinal sectional view of a chip for showing a first embodiment of the present invention.

 FIG. 2 is a longitudinal sectional view showing the structure of a ballpoint pen using the tip shown in FIG. FIG. 3 is a longitudinal sectional view showing a pen tip of a ball pen for illustrating a second embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

 FIGS. 1 to 3 show a tip and a ballpoint pen as a writing instrument using the present invention.

 FIG. 1 is a detailed view of a pen point portion of a ball-point pen.

 Here, the chip 1 forms an ink hole Id and a receiving seat 1b for supporting the rear end of the writing ball by cutting, and then a plurality of channel grooves lc to secure an ink flow path. Is formed. Then, after the writing ball 2 is stored in the receiving seat 1b side of the chip 1, the tip 1 is formed by caulking 1a by caulking.

 Therefore, the writing ball 2 is prevented from falling out of the tip 1 by the caulking 1a at the front end side and by the seat 1b at the rear end side.

 Further, the writing pole 2 has a play in the longitudinal direction of the chip 1 between the caulking 1a and the receiving seat 1b.

Further, in this embodiment, a spring is shown at the rear end of the writing ball 2 as an elastic body 3 for pressing the writing ball 2 against the caulking 1a. The elastic body 3 is formed such that the leading end thereof is prevented from coming off by the writing ball 2 and the rear end is prevented from coming off by caulking or a step at the rear end of the chip 1. The tip can be formed of a metal such as stainless steel, brass, nickel silver, or plastic or the like. The writing ball can be formed of ceramic, cemented carbide, stainless steel, or the like.

 FIG. 2 shows a cursive type using the tip shown in FIG.

 Here, the above-described chip 1 is fixed to the joint 4, and the ink storage tube 9 is fixed to the joint 4. A check ball 5 is located between the tip 1 and the joint 4. Further, the ink 6 is stored in the ink storage tube 9, and a follower 7, in which a follower rod 8 is positioned at one end, is filled on the side opposite to the chip 1.

 If the check ball 5 is positioned vertically with tip 1 tip down, it will be located at the rear end of tip 1 to block the path to tip 1 and prevent ink 6 from flowing into tip 1. It works as if it were.

 Here, the ink 6 has a viscosity of 10 cp to 500 cp at 23 ° C. ± 5 ° C. under general shearing force. In addition, as a component, based on water, 5 to 50% of a low volatile solvent such as glycerin / propylene glycol, 1 to 20% of a pigment or dye as a coloring agent, and other appropriate dispersants and gelling agents , Preservatives, surfactants, lubricants and other various additives.

 Ink 6 is also available in water-based, water-based, oil-based, non-volatile, high-grade alcohol-based, alcohol-based, lower alcohol-based, and It can be applied to various inks such as a correction liquid type based on a volatile solvent such as xane.

 The follower 17 is made of a hard-to-react grease, and the follower 8 is made of a material having a lower specific gravity or an apparent specific gravity than the ink 6.

 Here, assuming that the pressing force of the writing ball 2 of the elastic body 3 is F (g) and the total weight of the ball pen including the refill is M (g), the relational expression: M <F A relationship that satisfies the requirements.

Here, since M is F, the writing ball 2 is swaged by the elastic body 3 not only when the ball pen is placed sideways but also when the tip 1 is turned down. As a result, the ink 6 does not leak from the tip of the tip 1. Next, the inventor theoretically satisfies the relational expression: M x F, but in practice, Relational expression: a It was decided to obtain a when M and F.

 Therefore, a spring is used as the elastic body 3 with F ranging from 12 gf to 24 gf, and the total weight of the ball pen including the refill is M, 10 g and 12.4. g, 15.6 g were prepared and tested.

 Then, a contact DC test was performed with the ballpoint pen standing upright.

 Here, the ink 6 used had the following composition.

 (Mixed with ink)

 The ink used here was a neutral ink using 7% by weight of carbon black as a black pigment, 20% by weight of propylene glycol as a moisturizing wetting agent, 5% by weight of glycerin, and xanthan gum as a viscosity-imparting agent. 0.3% of a cross-linked acrylic acid polymer, an appropriate amount of a dispersant, a lubricant, a dustproofing / preservative, and a pH adjusting agent were blended, and the remainder was formed with water.

 This ink was measured with an E-type rotational viscometer manufactured by Toki Sangyo Co., Ltd., and found to be 300 mPa · s at lO rpm and lOOmP at lOOrpm. a · s indicates † :.

 The chip 1 and the joint 4 used had the following specifications.

Assembly time: 0.5 months

Tip writing ball diameter: 0.5 mm

Check ball diameter: 1.4 mm

Check ball weight: 0.0 1 g

 Then, three pieces of cotton paper were stacked, and the writing ball 2 was placed vertically so that the writing ball 2 directly hit the paper surface, and left for 1 hour. At that time, the temperature was 25 ° C., and the humidity was 60%. As a result, the following evaluation was performed.

〇: There is no backing of the ink, and the trace of the first ink is a trace

Climb: Ink dropout is up to 1st sheet, 1st ink mark is up to 1mm

△: Ink missing is up to 2nd sheet, 1st ink mark is up to 2mm

 Table 1 shows the results.

`` Table 1 J M (g) 10 g 12.4 g 15.6 g

Δ F (g) 〇

Δ

 1 2 6 6 6

 1 3 6 1 5 6

 1 4 7 4 3 7

 1 5 8 7 1 8

 1 6 2 1 1 2

 1 7 4 4 4

 1 8 2 1 1 2

 2 0 1 1 1

 2 1 6 6 5 1

 2 3 1 1 1

 2 4 1 1 1

From this result, if F is about 1.2 M,

〇: There is no backing of the ink, and the trace of the first ink is a trace

Was increased, and it was found that the film was sufficiently resistant to actual use. However, when F was 13 g and M was 12.4 g, the evaluation of 〇 was “1”. This suggests that although F and M are almost the same even if they are almost the same, it is evaluated that it is desirable to set the relationship between M and F to be 1.2 M or F in practice in consideration of safety. Is obtained.

 Therefore, when F is a value at the time of use for a ballpoint pen, it is desirable that the relationship between M and F be 1.2 M and F. At the same time, the deterioration of the elastic body after assembly was measured.

 Here, we examined how much the F that the elastic body had before assembling changed after assembling it to the ball pen.

 In this experiment, data obtained by averaging the results of examining 30 elastic bodies are shown as data.

Replacement form (Rule 26) Was:

The result is as shown in Table _2.c

`` Table 2 J

この実験では、 組立 2ヶ月後に一番 Fが小さくなり、 初期値に比べて、 約 1割低下し た。 このデータとしては 3ヶ月までのものしか示していないが、 実験によると、 この 2 ヶ月経過時の Fの値で、 その後はほぼ安定した数値となっている。

In this experiment, F became the smallest two months after assembly, and was about 10% lower than the initial value. Although this data shows only data up to 3 months, according to experiments, it is the value of F at the time of 2 months, and after that it is almost stable.

 Combined with the results in Table 1 above, the relationship between the initial F and M of the elastic body is given by the change in the F value of the elastic body.

 The relationship between M and F is 1.3 M <F

Was the most practically safe. In the above experiment, the contact DC test was performed with the ball pen upright. However, it was also confirmed that if there was little DC, writing was not impossible due to dry-up. In other words, good results in the contact DC test were also evaluated as good results in the dry-up test. In the above-described experiment, a case where a so-called gel ink was used was shown.

However, it has been confirmed that similar tendencies are observed even when neutral ink, oil-based ink, and the like that do not have pseudoplasticity are used. Next, the embodiment shown in FIG. 3 will be described.

 This embodiment is a detailed view of a pen tip portion of a needle type often used mainly for a low-viscosity aqueous ballpoint pen.

 Here, the writing ball 11 is rotatably positioned on the chip 10 with a vertical play in the front-rear direction. An elastic body 12 is inserted into the tip 10 from the rear end of the tip so as to reach the writing ball 11, and the tip 10 presses the writing ball 11, and the tip 10 is subjected to plastic working from the outer surface of the tip 10. It is retained by the formed caulking 10a.

 Here, the elastic body 11 can be formed of a member having an appropriate elasticity such as a resin or the like and capable of guiding ink to the writing ball 11 by a capillary phenomenon.

 By forming in this manner, the writing ball 11 is tightly sealed to the tip caulking 10b by the elastic body 12 when not in use, and the writing ball 12 is bent with the elastic body 12 bent during writing. Can be written by rotating

 Even when formed in this manner, when not in use, the writing ball 11 is tightly sealed to the tip caulking 10b by the elastic body 12b, so that contact direct current is prevented with the ball pen standing upright. Not only can it be done, but it can also prevent dry-up.

 In this example, it was confirmed that the same tendency as in Table 1 appears. Industrial applicability

 As described above, according to the present invention, even when the ballpoint pen is positioned in a state where the pen pointed downward and the ball was stored in an upright position with the ball exposed, the writing ball is pressed to the front end side by the elastic body. Since the writing ball functions as a ball valve, it is possible to prevent the ink from leaking from the pen tip and to prevent writing failure due to dry-up.

 Also, as in the invention described in claim 2, when F is a value at the time of assembling into a ball-point pen, if the relationship between M and F is 1.3 M <F, the time-dependent element It was found that the above effects could be stably obtained even when adding.

 Furthermore, as in the invention described in claim 3, when F is a value at the time of use for a ballpoint pen, the relationship between M and F is set to 1.2 M × F, and the pen is used at the time of use. It is possible to prevent ink leakage from the front or writing failure due to dry-up.

 As in the invention described in claim 4, the inner diameter of the tip of the tip is written at the time of crimping.

Replacement paper (Kaikai IJ26) When caulking is performed so as to press against the pole, the caulking process forms a seal surface of a constant width having substantially the same curvature as the writing ball on the inner surface of the tip end. Therefore, when the writing ball is used as a ball valve, the seal can be reliably performed.

 Further, as in the invention described in claim 5, when the joint member is positioned between the tip and the refill and the tip is positioned vertically with the tip end down, the tip is positioned at the rear end side. If the checkpoint ball is provided in the joint member to block the passage to the chip and prevent the ink during refilling from flowing into the chip, the ballpoint pen can be set up so that the tip is turned down. Since it becomes difficult for the ink to flow to the tip side, it is possible to further prevent ink leakage from the pen tip and also prevent writing from being performed due to dry-up.

Claims

Scope of ΐ 1. A writing ball that is rotatably fitted so as to protrude from the tip of the tip is caulked on the tip side and is restricted from moving back and forth by the receiving seat on the rear end side. A writing ball, a pen tip having an ink hole for drawing ink from the rear end side, an ink storage tube for storing the ink, and a plurality of grooves communicating the receiving seat and the ink hole. A ballpoint pen having a channel groove and an elastic body installed so as to always or directly press the writing ball at the tip via a movable member, including a writing ball pressing force F (g) of the elastic body and a refill. A ball pen characterized by a relation satisfying a relational expression: M × F between the ball pen and the total weight M (g).  2. The ballpoint pen according to claim 1, wherein the relationship between M and F is 1.3M <F, where 2.F is a value at the time of assembly into the ballpoint pen.  3. The ballpoint pen according to claim 1, wherein the relationship between M and F is 1.2M <F, where F is a value when used for a ballpoint pen.  4. The ball-point pen according to claim 1, wherein, at the time of caulking, the inner diameter of the tip of the chip is caulked so as to press against the writing ball.  5. When the joint member is positioned between the tip and the refill and the tip is positioned vertically with the tip end down, it is located at the rear end of the tip, blocking the passage to the tip, and preventing the refilling of the ink. 4. The ballpoint pen according to claim 1, wherein a check ball for preventing inflow to the chip is provided in the joint member. 10 Replacement paper (Kaikai IJ26)