JPH0995084A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the ink leakage even if an impact is applied by forming a weak capillary force part having no pectinated teeth at the temporary ink reservoir of a temporarily ink reserving member, and opening a vent hole for substituting the air and the ink at the force part. SOLUTION: A temporarily ink reserving member 4 having a nib holder 2 and a temporary ink reservoir is mounted at the opening side in a metal cylinder 1 with a bottom containing ink of free state. The member 4 has a plurality of pectinated grooves 10 as the temporarily ink reservoir, and a slit 12 for communicating with the space between the teeth 10 and a central hole 9. Further, the side distance part between the teeth 10 is formed as a weak capillary force part 13, and an air flow hole 14 opened at the end of the holder 2 is opened at the force part 13. Thus, even if an impact is given, no ink leakage occurs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary ink reservoir having a temporary ink reservoir having a comb-shaped longitudinal section as a flow control member for supplying ink, which is freely contained in an ink tank, to a pen tip. The present invention relates to a writing instrument having a member.

[0002]

2. Description of the Related Art A writing instrument having a temporary ink reservoir having a temporary ink reservoir having a comb-shaped longitudinal section as a flow control member for supplying ink, which is freely contained in an ink tank, to a pen tip. Is known as a so-called raw ink type writing instrument, which can use an ink tank that stores a large amount of ink, can supply abundant ink to the pen tip, and is known to provide fresh handwriting. . However, since a large amount of ink is supplied to the nib, it is designed with great care in controlling ink leakage and ink shortage.

That is, a raw ink type writing instrument having a temporary ink reservoir member as an ink flow control member is a temporary ink reservoir member when the ink in the ink tank is supplied to the pen tip. The outside air is supplied into the ink tank through the space between the main body of the writing instrument to prevent the inside of the ink tank from becoming negative pressure. Therefore, the opening of the air hole communicating with the outside air is basically formed in the pen tip holder portion that substantially connects the temporary ink reservoir member and the writing instrument main body.

[0004]

The temporary ink reservoir member serves as a portion in which excess ink is temporarily retained in the inter-comb space of the comb-shaped section having a capillary force. Therefore, it is open to the space between the temporary ink reservoir member, which is a portion that supplies air into the ink tank, and the writing instrument body. That is, the ink accumulated in the space between the comb teeth of the temporary ink reservoir member is only retained by the capillary force, and is present in the portion open to the space communicating with the outside. Therefore, when an impact is applied to the writing instrument itself, the ink temporarily stored in the temporary ink reservoir member is easily scattered in the space communicating with the outside world.
There is a problem that the scattered ink adheres to the inner wall of the writing instrument main body and appears as an ink leak to the outside through the opening of the air hole communicating with the outside air.

[0005]

That is, according to the present invention, a temporary ink reservoir having a comb-shaped longitudinal section is provided as a flow control member for supplying ink, which is freely contained in an ink tank, to a pen tip. In a writing instrument having a temporary ink reservoir member, a weak capillary force portion having no comb teeth is formed in the temporary ink reservoir portion of the temporary ink reservoir member, and ink-air displacement is performed in the weak capillary force portion. The gist is a writing instrument characterized in that a ventilation hole for is opened.

[0006]

First, the air passage for supplying air to the ink tank is designed so as not to directly communicate with the opening of the air flow passage. That is, the temporary ink reservoir member is formed in the middle portion thereof and opened in a portion where ink hardly exists. This is the reason why this portion is used as a weak capillary force portion without forming comb teeth that exert a capillary force. Originally, it is preferable to set the portion having no capillary force at all, but since it is not practical, the weak capillary force portion is used. Also, this weak capillary force section is also connected to the temporary ink reservoir by a slit so that even if ink gets in, the ink will quickly move to other temporary ink reservoirs and will not reach the air circulation holes. is there.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example will be described below with reference to the drawings.
The one shown in FIG. 1 is an example of a refill of a so-called writing instrument that is used by being stored in an exterior body (not shown). A temporary ink reservoir member 4 including a pen tip holder portion 2 and a temporary ink reservoir portion 3 is attached to the opening side of a metal bottomed cylindrical body 1 containing ink in a free state, and the bottom side is an ink tank. A ballpoint pen tip 7 is attached to the pen tip holder portion 2 of the temporary ink reservoir member 4 via a joint pipe 6 as a portion 5. Also, the ink relay core 8 made of a fiber bundle
From the inner hole of the ballpoint pen tip 7 to the ink tank portion 5 through the central hole 9 of the temporary ink reservoir member 4.

The temporary ink reservoir member 4 has a plurality of comb teeth 10 as the temporary ink reservoir portion 3, and a space 12 between the comb teeth and a slit 12 communicating with the central hole 9 are formed. When a pressure is applied to the ink tank portion 5 due to a temperature change or the like, the excess ink pushed out by the pressure is not supplied to the ballpoint pen tip 7 via the ink relay core 8 but to the space 11 between the comb teeth 10 via the slit 12. It is temporarily stored.

In the case of this example, a water-based dye ink having a viscosity of 10 cps or less and a surface tension of about 20 to 50 dyn / cm and a temporary ink reservoir member 4 made of acrylonitrile butadiene styrene copolymer are used. The contact angle of the ink with respect to No. 4 is about 20 ° to 50 °, and considering the ink holding ability by the capillary force, the comb teeth 1
The distance between 0s (width of the space 11) and the width of the slit 12 are set to about 0.1 mm to 0.5 mm.

As shown in FIG. 2, which is an enlarged view of the portion I in FIG. 1, in the temporary ink reservoir 3 in which the comb teeth 10 are formed, a portion having a wide distance between the comb teeth 10 has a weak capillary force. It is formed as part 13. The weak capillary force portion 13 has almost no ink holding ability as compared with the other inter-comb space 11 and the slit 12, and is a portion in which ink is relatively hard to exist. By the way, in this example, the width of the weak capillary force portion 13 is set to 1.0 mm. Further, as shown in FIG. 3 which is a sectional view taken along the line AA of FIG. 2, an air circulation hole 14 that opens at the tip of the pen tip holder portion 2 is opened in this weak capillary force portion 13. . The opening portion at the tip of the pen tip holder portion 2 of the air flow passage 14 is opened over the entire circumference of the joint pipe 6.

Such a writing instrument is usually used in such a form that the pen tip is at the bottom and the ink tank is at the top. As described above, excess ink when pressure is applied to the ink tank portion 5 is stored in the inter-tooth space 11 through the slit 12.

At this time, when a shock or the like is applied, the ink stored in the inter-comb space 11 is scattered and adheres to the inner wall 1a of the bottomed cylindrical body 1. Since the ink attached to the inner wall 1a is not regulated, it will be transmitted to the inner wall 1a and fall to the pen tip side by attractive force. The opening, which is the most pen tip side portion of the bottomed tubular body 1, is sealed by the pen tip holder portion 3 so that ink does not leak out from here.

The weak capillary force portion 13 is not formed at the pen tip side portion of the temporary ink reservoir portion 3 which is the opening portion of the bottomed cylinder 1. This is because if it is formed in this portion, it will be attacked by the ink adhering to the inner wall 1a. Therefore, the inter-comb space 11 is formed at the most pen tip side portion of the temporary ink reservoir 3, and even if the ink adhering to the inner wall 1a reaches the vicinity of the opening of the bottomed cylindrical body 1, it is positioned at that portion. The interdental space 11 and the slit 12 are taken into the interdental space 11. That is, the ink does not penetrate into the weak capillary force portion 13 in which the air circulation hole 14 is open, and the occurrence of ink leakage from the air circulation hole 14 is suppressed as much as possible.

Other than the above, various modifications can be made without departing from the gist of the present invention. For example, in the illustrated example, the refill having the ballpoint pen nib is shown, but it is also possible to use it as a writing instrument by itself without using an exterior body, and as a pen nib, a felt pen, a continuous porosity may be used. It may be a synthetic resin pen tip or the like. Further, the bottomed cylindrical body 1 may be a molded product of synthetic resin in addition to metal, and a tail plug may be attached to the rear end portion. Examples of the material of the temporary ink reservoir member 4 include acrylonitrile butadiene styrene copolymer, acrylonitrile styrene copolymer, polystyrene, polyoxymethylene, and the like. You may give a process. In addition, the weak capillary force portion 13
In forming the, in addition to forming a wide portion between the comb teeth, it is also possible to partially perform the surface treatment of the ink repellent, or to make the surface shape of the portion mirror-like compared to the surroundings. it can.

[0015]

As described above, the writing instrument of the present invention is a raw ink type writing instrument which employs a vertical comb tooth-shaped temporary ink reservoir member, but is unlikely to cause ink leakage even when an impact is applied. Is.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment.

FIG. 2 is an enlarged view of a portion I in FIG.

FIG. 3 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Bottomed cylinder 1a Inner wall 2 Pen tip holder part 3 Temporary ink reservoir part 4 Temporary ink reservoir member 5 Ink tank part 6 Joint pipe 7 Ballpoint pen tip 8 Ink relay core 9 Center hole 10 Comb teeth 11 Space 12 Slit 13 Weak Capillary force part 14 Air circulation hole

Claims (1)

[Claims] 1. A writing instrument comprising a temporary ink reservoir having a comb-shaped temporary ink reservoir as a flow control member for supplying ink, which is freely contained in an ink tank, to a pen tip. In the temporary ink reservoir member, a weak capillary force portion having no comb teeth is formed in the temporary ink reservoir portion, and the weak capillary force portion has ink.
A writing instrument having a vent hole for air replacement.