JPH06127186A - Low viscosity ink writing instrument - Google Patents

Abstract

PURPOSE:To effectively retain a large quantity of ink to be discharged due to a pressure change in an ink reservoir in two large capacity ink reservoirs of a spare ink reservoir and the reservoir and to prevent discharge of ink from a writing tip even when the tip is left to stand downward. CONSTITUTION:A first air exchange slit 13 with a narrow deep bottom is provided at a spare ink reservoir 9, a first air introducing groove 15 having a large sectional area is provided between a first parallel ring 11 of an opposite surface and a barrel 1, a second air exchange slit 14 with a narrow deep bottom is provided at an upper surface of the slit 13 at an arbitrary part of a second parallel ring 12 from a rear end of an intermediate ring 10, and a second air introducing groove 16 having a large sectional area is provided between the ring 12 of the slit 14 and the barrel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink outflow control tube for a low viscosity ink writing instrument, and more particularly to an ink outflow control tube for a liquid type low viscosity ink writing instrument having an ink reservoir.

[0002]

2. Description of the Related Art In a low-viscosity ink writing instrument, particularly a liquid-type writing instrument, ink is supplied from an ink storage portion to a writing end according to writing, but the internal pressure of the ink storage portion decreases at that time.
This decrease in internal pressure is normally not guaranteed by introducing air from the outside, and the supply of ink to the writing end is hindered. Further, when the internal pressure of the ink storage portion rises due to changes in temperature, atmospheric pressure, etc., excess ink flows out to the writing end. In order to prevent these, generally, in a liquid low viscosity ink writing instrument, an ink outflow control cylinder having an ink retaining portion is installed between the ink storage portion and the writing end. Normally, the ink outflow control cylinder is provided with a narrow and deep slit that communicates with the ink storage part and the ink storage part in the axial direction.When writing, air is sent to the ink storage part through the slit to reduce the internal pressure of the ink storage part. Guarantee. Further, when the ink is allowed to stand still, the surface tension of the ink is used to guide the ink to the slits, thereby preventing excess air from entering the ink reservoir. If the internal pressure of the ink reservoir rises due to changes in temperature or pressure,
The ink is prevented from flowing out from the writing edge by temporarily bypassing the ink to the ink retaining section through the slit.

[0003]

However, in the conventional writing instruments of this type, the volume of the ink retaining portion was small, so that the internal pressure of the ink storing portion was greatly increased and a large amount of ink could flow out from the ink storing portion. In some cases, the ink could not be held in the ink holding section, and the ink sometimes leaked to the outside. In addition, when felt is attached to the writing end and used as a marker, felt-tip pen, etc., the ink consumed by writing is considerably larger than that of a water-based ballpoint pen, etc., so the supply of air to the ink reservoir is also appropriate. Quantity is required. For that purpose, it is necessary to have an air exchange slit with a structure that gently supplies air to the ink storage part without resistance, but if that is done then, when the writing end is left downward, the ink from the writing end to the outside of the ink due to its own weight. There was a problem such as the outflow of.

[0004]

SUMMARY OF THE INVENTION The present inventors have been made in order to solve the above-mentioned problems. In particular, the excessive outflow of ink from the ink storage portion to the writing end portion via the ink guide core is performed. It is intended to provide a writing instrument capable of preventing the accompanying outflow of ink. That is, an outer cylinder provided with an ink storage portion in the rear part, and a press-fitted part in the front part of the outer cylinder, having a writing end at the tip, made of a fibrous or solid body in the axial direction of the central part, and equipped with an ink guide core. In a low-viscosity ink writing instrument consisting of an ink outflow control cylinder, a tail end ring of the same size as the inner diameter of the outer cylinder is provided at the rear end of the outer surface of the ink outflow control cylinder in a direction perpendicular to the axial direction, and slightly ahead of the tail end ring. A plurality of small-diameter, narrow-width deep-bottom first parallel rings are attached, and further an intermediate ring of the same size as the tail end ring is provided in front of it, and the narrow width in the axial direction from the rear end of the tail end ring to the rear end of the intermediate ring. Preliminary ink holding section with deep first air exchange slit and first air introduction groove with a large cross section between the first parallel ring on the opposite surface and the outer shaft, and the intermediate in front of the intermediate ring It has a plurality of second parallel rings that are slightly smaller than the ring. And from the rear end of the intermediate ring to any portion of the second parallel ring, a narrow deep deep second air exchange slit is provided on the opposite surface of the first air exchange slit, and any portion of the second air exchange slit is Ink that communicates with the central ink guide core within a range shorter than its overall length and that has a second air introduction groove having a large cross section between the second parallel ring on the opposite surface of the second air exchange slit and the outer shaft. It constitutes a holding unit.

[0005]

According to the low viscosity ink writing instrument of the present invention,
Since it has a large volume ink holding part consisting of a dual structure of a preliminary ink holding part and an ink holding part, it can sufficiently handle the outflow of excess ink due to a large increase in the internal pressure of the ink storage part. Even when the ink is left facing downward, the surface tension of the ink introduced into the two air exchange slits, the first air exchange slit and the second air exchange slit, supports the pressure due to the weight of the ink applied to the writing end. It is possible to prevent further outflow of ink.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. An outer cylinder 1 is provided with an ink storage portion 2 at the rear portion, and an ink outflow control cylinder 3 is fitted to the front portion. A writing end 6 is attached to the front portion of the ink outflow control cylinder 3, and an ink guide core 7 is inserted in the axial direction of the central portion. A tail end ring 8 having the same size as the inner diameter of the outer cylinder 1 is provided at the rear end of the outer surface of the ink outflow control cylinder 3 perpendicularly to the axial direction.
A plurality of narrow first deep parallel rings 11 having a diameter slightly smaller than the tail end ring 8 are provided in front of the tail end ring 8, and an intermediate ring 10 having the same size as the tail end ring 8 is further provided in front of the tail end ring 8. A first air exchange slit 13 that is narrow and deep in the axial direction is provided from the rear end to the rear end of the intermediate ring 10, and a large cross section is provided between the first parallel ring 11 and the outer shaft 1 on the opposite surface. A preliminary ink holding portion 9 provided with one air introduction groove 15 and a second parallel ring 12 having a diameter slightly smaller than that of the intermediate ring 10 are provided in front of the intermediate ring 10, and the second parallel ring is provided from the rear end of the intermediate ring 10. A narrow and deep second air exchange slit 14 is provided on the opposite surface of the first air exchange slit 13 up to an arbitrary portion of the parallel ring 12, and an arbitrary portion of the second air exchange slit 14 is shorter than its entire length. While communicating with the ink guide core 7 in the center The ink holding section 5 is configured by providing a second air introduction groove 16 having a large cross section between the second parallel ring 12 and the outer shaft 1 on the step opposite to the second air exchange slit 14. is there. The second air introduction groove 16 communicates with the atmosphere through the air hole 4. In this embodiment, the ink guide core 7 is made of a fibrous body, the front end of which is in contact with the writing end 6 and the rear end of which is in communication with the ink reservoir 2.

The writing instrument of this embodiment is constructed as described above, and when not in use, the ink in the ink reservoir 2 is sucked by the capillary action of the narrow and deep first air exchange slit 13. By completely blocking even the second air exchange slit 14 with ink, the outside air is prevented from entering the ink storage portion 2. Even when the writing end 6 is left facing downward, the first air exchange slit 13 and the second air exchange slit 1 provided on the tail end ring 8 and the intermediate ring 10 are left.
The narrow width and deep bottom slit 4 keeps the pressure on the writing end 6 due to the weight of the ink, so that the outflow of ink from the writing end 6 is prevented. At the time of writing, when the ink in the ink storage portion 2 is reduced due to the consumption of the ink and the pressure in the ink storage portion 2 is reduced, the outside air is introduced from the air hole 4 into the second air introduction groove 16, the second air exchange slit 14, First air groove 15,
The ink is supplied to the ink reservoir 2 through the first air exchange slit 13. When the pressure in the ink storage portion 2 rises due to the influence of the temperature and the atmospheric pressure, the ink is guided to the preliminary ink holding portion 9 through the first air exchange slit 13 and held between the first parallel rings 11. It Further, the excess ink is guided to the ink retaining portion 5 through the second air exchange slit 14 communicating with the ink guide core 7 and held between the second parallel rings 12, whereby the outflow of the ink to the outside is prevented. The ink retained in the ink retaining section 5 and the preliminary ink retaining section 11 gradually decreases as the ink is depressurized in the ink storing section 2 or the ink is consumed by writing.

[0008]

As described above, in the low viscosity ink writing instrument according to the present invention, a large amount of ink that flows out due to the pressure change in the ink storage portion is stored in a large volume of ink in two places, the preliminary ink storage portion and the ink storage portion. It is possible to reliably hold the ink in the portion, and even when the writing end is left downward, it is possible to prevent the ink from flowing out from the writing end.

[0009]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a low viscosity ink writing instrument according to the present invention.

FIG. 2 is a vertical cross-sectional view taken along the line AA ′ in FIG.

FIG. 3 is a vertical cross-sectional view taken along the line BB ′ in FIG.

FIG. 4 is a vertical cross-sectional view taken along the line CC ′ in FIG.

5 is a vertical cross-sectional view taken along the line DD 'in FIG.

[Explanation of symbols]

 1 Outer cylinder 2 Ink storage part 3 Ink outflow control cylinder 4 Air hole 5 Ink holding part 6 Writing end 7 Ink lead core 8 Tail end ring 9 Preliminary ink holding part 10 Intermediate ring 11 First parallel ring 12 Second parallel ring 13th One air exchange slit 14 Second air exchange slit 15 First air introduction groove 16 Second air introduction groove

Claims (1)

[Claims] 1. An outer cylinder having an ink storage portion in the rear portion, a writing portion at the front end that is press-fitted in the front portion of the outer cylinder, and an ink guide core made of a fibrous or solid material is attached in the axial direction of the central portion. In a low-viscosity ink writing instrument composed of an ink spill control cylinder, a tail end ring of the same size as the inner diameter of the outer cylinder is provided at the rear end of the outer surface of the ink spill control cylinder in a direction perpendicular to the axial direction and slightly smaller than the tail end ring A plurality of narrow parallel deep first parallel rings are attached, and further an intermediate ring of the same size as the tail end ring is provided in front of it, and the narrow width deep bottom is extended from the rear end of the tail end ring to the rear end of the intermediate ring in the axial direction. Equipped with a first air exchange slit,
In addition, a preparatory ink holding portion formed by providing a first air introduction groove having a large cross section between the first parallel ring on the opposite surface and the outer shaft, and a second parallel ring slightly smaller than the intermediate ring in front of the intermediate ring. And a narrow and deep second air exchange slit is provided on the opposite surface of the first air exchange slit from the rear end of the intermediate ring to an arbitrary portion of the second parallel ring, and any of the second air exchange slits is provided. The part communicates with the central ink guide core within a range shorter than its entire length, and a second air introduction groove having a large cross section between the second parallel ring and the outer shaft is provided on the step opposite to the second air exchange slit. A low-viscosity ink writing instrument characterized by constituting an ink retaining section provided.