JPH0357512Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] This invention is designed to store ink in an ink tank and supply the same amount of air to the ink tank as the amount of ink consumed during writing. It is related to writing instruments.

[Conventional technology]

Traditionally, in writing instruments that use a raw ink supply system, when the internal pressure in the ink tank chamber decreases as ink is consumed by writing, air is supplied into the ink tank chamber in an amount equal to the amount of ink consumed. When the internal pressure of the ink tank chamber increases due to the rise, there is a system in which the ink that has flowed out (pushed out) from the ink tank chamber is retained in an ink retention section.

[Problem that the invention attempts to solve]

However, in conventional writing instruments of this kind, because the volume of the ink storage part is small, the internal pressure of the ink tank chamber increases significantly, and a large amount of ink may be excessively discharged from the ink tank chamber. In many cases, the ink could no longer be stored in the ink storage section and the ink leaked out. In addition, the ink reserved in the ink storage section is originally returned to the ink tank chamber as the internal pressure of the ink tank chamber decreases, but with conventional writing instruments, this ink return is not sufficient. In many cases, it was not carried out and was not consumed.

This invention was made to solve the above-mentioned problems, and can prevent ink from leaking due to excessive outflow of a large amount of ink from the ink tank chamber. To provide a writing instrument capable of smoothly returning ink stored in a storage part to an ink tank chamber.

[Means for solving problems]

The writing instrument according to this invention is provided with a double ink storage section, inside and outside, which can reliably store a large amount of ink that has flowed out excessively due to a large increase in the internal pressure of the ink tank chamber, and an inner ink storage section. An ink return section 22 is provided for returning ink retained in the ink tank chamber to the ink tank chamber by capillary action.

[Effect]

According to the writing instrument according to this invention, since it has a large-volume ink storage part consisting of an inner and outer double structure, even if a large amount of ink flows out from the ink tank chamber, the large amount of ink can be The ink can be reliably stored in the large-volume ink storage section. Moreover, as the internal pressure of the ink tank chamber decreases, the ink reserved in the ink storage section can be smoothly returned to the ink tank chamber by capillary action caused by the ink return section.

〔Example〕

An embodiment of the writing instrument according to this invention will be described below with reference to the drawings.

First, a first embodiment will be explained with reference to FIGS. 1 to 4.

This writing instrument includes a pen holder 2, a pen core 5, an outer cylinder 9, an ink guiding core 8, etc., which are made of synthetic resin or the like. At the center of the pen holder 2 is a protective pipe 1 having a ball 1a at its tip.
A writing section 1 is attached which includes a small-diameter ink guiding core 3 inserted from the opposite side of the ball 1a. The small-diameter ink guide wick 3 guides ink to the ball 1a by capillary action. Then, the pen holder 2 is concentrically inserted and fixed inside the tip 5a of the pen core 5, and the outer cylinder 9 is concentrically inserted around the outer periphery of the pen core 5 and fixed at the press-fit fitting part 9a. has been done. Further, the ink guide core 8 is housed concentrically within the pen core 5, and both ends 8a, 8b of the ink guide core 8 are connected to a border-shaped ink guide provided on the side opposite to the writing section 1 of the pen holding section 2. It is inserted into and fixed to the stepped hole 2a and the through hole 5c provided at the other end 5b of the pen core 5. and,
The inside of the outer cylinder 9 on the side opposite to the pen holder 2 is partitioned by the other end 5b of the pen core 5, and an ink tank chamber 13 is provided inside.

The ink guide core 8 is formed of a fiber core made of a synthetic fiber bundle or the like, and a small diameter bottomed hole 11 provided at the center of the tip 8a is inserted into the outer periphery of the small diameter ink guide core 3 of the writing section 1. has been done. and,
The ink tank chamber 13 and the writing instrument 1 are communicated with each other by the ink guide core 8.

An inner ink retention portion 7 is formed concentrically between the pen core 5 and the ink guide core 8.
An outer ink storage section 10 is provided between the outer cylinder 9 and the pen core 5.
are formed concentrically.

At this time, the inner ink storage portion 7 is formed by a cylindrical space, and the inner circumferential side thereof is communicated with the outer circumferential portion of the ink guiding core 8.

The outer ink retention portion 10 also includes a comb-shaped groove 15 formed on the outer periphery of the pen core 5 and a communication groove 16 that communicates the comb-shaped groove 15 in the longitudinal direction of the pen core 5.
It is composed of: The pen holder 2 side of the outer ink reservoir 10 is communicated with the atmosphere through the air hole 4 and the abdominal groove 14, and the opposite side thereof is communicated with the inner ink reservoir 7 through the communication hole 12.

The other end 8 of the ink guiding core 8 is placed on the writing part 1 side within the through hole 5c provided at the other end 5b of the pen core 5.
b is inserted, and ink and air guide 18 are press-fitted into the ink tank chamber 13 side within this through hole 5c. An ink groove 19 and an air groove 20 are provided on the outer periphery of the ink and air guide 18, and an annular groove 19 and an air groove 20 are provided on the inner periphery of the through hole 5c. A gap 21 is provided. An ink return section 22 is formed by these gaps 21, ink grooves 19, and air grooves 20.

At this time, the gap 21 of the ink return section 22 is narrower than the gap of the inner ink storage section 7, and the ink groove 9 and the air groove 20 are formed even narrower than the gap 21.

In addition, the communication hole 12 formed in the pen body 5 and communicating between the outer ink retention part 10 and the inner ink retention part 7 has a large diameter hole 12 on the outer ink retention part 10 side.
a, and the small diameter hole 1 is formed on the inner ink storage part 7 side.
It is formed in a stepped hole formed in 2b.

This writing instrument is constructed as described above, and is used by storing low-viscosity ink in the ink tank chamber 13.

First, when writing, ink in the ink tank chamber 13 flows out from the ink groove 19 and the ink guide wick 8 and is supplied to the ball 1a of the writing section 1 via the small diameter ink guide wick 3. Then, as the internal pressure of the ink tank chamber 13 is lowered due to the ink consumption, the same amount of air as the ink consumption is released from the air hole 4 from the abdominal groove 14 to the outer ink storage part 1.
0-Communication section 12-Inner ink retention section 7-Gap 21
- is supplied to the ink tank chamber 13 through the air groove 20;

Next, when the internal pressure of the ink tank chamber 13 increases due to the rise in atmospheric pressure and temperature, the ink tank chamber 1
The ink flowing out from the ink wick oozes out from the outer periphery of the ink guide wick 8, which is a fiber core, and is transferred to the inner ink storage section 7.
It flows into the interior and is held. At this time, if the internal pressure of the ink tank chamber 13 increases significantly and a large amount of ink is excessively discharged from the ink tank chamber 13,
After the ink is filled in the inner ink storage section 7,
Excess ink passes through the communication section 12, flows into the comb-shaped groove 15 of the outer ink storage section 10 through the communication groove 16, and is reliably retained.

Next, when the internal pressure of the ink tank chamber 13 is lowered again, the ink reserved in the inner ink retaining section 7 passes through the ink return section 22 due to capillary action due to the above-mentioned air supply. It is returned to the tank chamber 13.

That is, in the ink return section 22, the gap 21 is narrower than the gap in the inner ink retention section 7, and the ink grooves 9 and the air grooves 20 are formed even narrower than the gap 21, so that capillary force inevitably causes the inner ink retention. The ink that is reserved in the inner ink tank chamber 7 is smoothly returned to the ink tank chamber 13 by the capillary action caused by the ink return section 22. .

Similarly, the ink reserved in the comb-shaped groove 15 of the outer ink retaining portion 10 also flows into the communication groove 16- as the internal pressure of the ink tank chamber 13 decreases.
The ink is smoothly returned to the ink tank chamber 13 through the communication hole 12, the inner ink storage section 7, and the ink return section 22.

Further, according to the ink guide wick 8 formed of a fiber core, surplus ink supplied from the ink tank chamber 13 to the writing instrument 1 oozes out from the outer peripheral part of the ink guide wick 8 and is stored in the inner ink storage section 7. ,
During writing with the writing instrument 1, the ink tank chamber 1
To surely supply ink stored in an inner ink storage part 7 to a writing instrument 1 through which ink is permeated from the outer periphery of the ink guide wick 8 when the ink storage part 3 becomes empty.

Further, according to the communicating hole 12 formed in the stepped hole between the large diameter hole 12a and the small diameter hole 12b, the transfer of ink from the inner ink storage part 7 to the outer ink storage part 10 is controlled by the small diameter hole 12b. On the other hand, when not in use, the ink stored in the outer ink storage section 10 has the function of easily returning from the large diameter hole 12a to the inner ink storage section 7 from the large diameter hole 12a.

Next, FIG. 5 shows a first modification of the first embodiment, in which the small diameter hole 12b of the communication hole 12 is turned into a tapered hole 12c whose diameter gradually becomes smaller toward the inner ink storage section 7. It has the same function as the communicating hole 12 which is a stepped hole shown in the first embodiment.

Next, FIG. 6 shows a second modification of the first embodiment, in which the entire communication hole 12 is formed into a tapered shape whose diameter gradually becomes smaller from the outer ink storage part 10 toward the inner ink storage part 7. It is formed in the hole 12d, and has the same function as the communicating hole 12, which is a stepped hole shown in the first embodiment.

Next, FIG. 7 shows a third modification of the first embodiment, in which the communication hole 12 is formed as a straight hole 12e.

Although the embodiments of this invention have been described above, various effective modifications can be made based on the technical idea of this invention.

[Effect of idea]

As described above, according to this invention, a large amount of ink that has excessively flowed out from the ink tank chamber can be reliably retained in the large-volume ink retention section that has a dual structure inside and outside.
Leakage due to excessive ink outflow can be prevented, resulting in extremely high safety. In addition, since the ink retention section is connected to the ink guiding core on its inner circumferential side, the ink reserved in the ink retention section can be short-circuited and supplied to the writing section during writing, so that it can be consumed without fail. .

Moreover, as the internal pressure in the ink tank chamber decreases,
The ink stored in the inner ink storage section can be smoothly returned to the ink tank chamber by the capillary action of the ink return section, which prevents accidents such as excess ink unexpectedly clumping inside the ink storage section. This has the effect of eliminating this problem and ensuring that the retained ink can always be reused.

Since surplus ink is not simply stored in the ink storage section, the inside of the storage section will be almost empty the next time it is used, so this is an extremely effective measure to prevent ink leakage.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, in which Fig. 1 is a central vertical sectional view of the entire writing instrument, Fig. 2 is an enlarged sectional view of the main parts of the same, and Fig. 3 is a cross-sectional view of the - arrow in Fig. 2. 4 is a sectional view taken in the - arrow direction of FIG. 2, and FIGS. 5, 6, and 7 are main parts showing the first, second, and third modifications. FIG. 1 is a writing part, 2 is a pen holder, 4 is an air hole, 5
1 is an inner cylinder, 7 is an inner ink storage part, 8 is an ink guiding wick, 9 is an outer cylinder, 10 is an outer ink storage part, 12 is a communication hole, 13 is an ink tank chamber, and 22 is an ink return part.

Claims (1)

[Claims for Utility Model Registration] (1) An outer cylinder 9 provided with an ink tank chamber 13, and a pen core housed within the outer cylinder 9 and having a writing part 1 attached to the tip via a pen holder 2. 5 and the ink tank chamber 1 is stored in this pen core 5.
3 and an ink guide core 8 that communicates between the writing part 1 and an inner ink reservoir formed between the pen core 5 and the ink guide core 8 and whose inner peripheral side communicates with the ink guide core 8. 7, an outer ink reservoir 10 formed between the outer cylinder 9 and the pen core 5, one end communicating with the inner ink reservoir 7 and the other end communicating with the atmosphere; An ink return section is provided to communicate between the inside ink storage section 7 and the ink tank chamber 13 in order to return the ink reserved in the inside ink storage section 7 to the ink tank chamber 13 by capillary action. A writing implement comprising: 22. (2) The writing instrument according to claim 1, wherein the ink guide core 8 is made of a fiber core.