JP3917259B2 - Direct liquid writing instrument - Google Patents

Direct liquid writing instrument Download PDF

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Publication number
JP3917259B2
JP3917259B2 JP24993797A JP24993797A JP3917259B2 JP 3917259 B2 JP3917259 B2 JP 3917259B2 JP 24993797 A JP24993797 A JP 24993797A JP 24993797 A JP24993797 A JP 24993797A JP 3917259 B2 JP3917259 B2 JP 3917259B2
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JP
Japan
Prior art keywords
ink
occlusion body
portion
writing instrument
capillary force
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Expired - Fee Related
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JP24993797A
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Japanese (ja)
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JPH1178352A (en
Inventor
茂 大池
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パイロットインキ株式会社
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Priority to JP24993797A priority Critical patent/JP3917259B2/en
Priority claimed from CA 2246422 external-priority patent/CA2246422A1/en
Publication of JPH1178352A publication Critical patent/JPH1178352A/en
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a direct liquid writing instrument. More specifically, the present invention relates to a direct liquid writing instrument in which ink is stored directly in an ink tank and an ink occlusion body made of a porous material is disposed between the pen tip and the ink tank. In the present invention, “front” indicates the pen tip side, and “rear” indicates the ink tank side.
[0002]
[Prior art]
Conventionally, in this type of writing instrument, for example,(1)In Japanese Utility Model Publication No. 56-33739, "a writing body is fastened to the tip of a shaft cylinder, and an ink occlusion body having a capillary action that contacts the rear portion of the writing body is communicated with the outside air between the inner surface of the shaft cylinder. Installed in the shaft cylinder so that a ventilation path can exist, and a compression member is attached to the rear end of the ink occlusion body, and the capillary gap of the ink occlusion body in the attachment portion is made dense, and the rear end of the ink occlusion body "A writing instrument in which an ink tank provided in a rear portion of a shaft and an ink tank is connected by a communication hole" is disclosed. (See Figure 6)
[0003]
Also,(2)In Japanese Utility Model Publication No. 2-48377, “in a writing instrument in which an ink lead-out body is disposed between an ink tank and a tip writing body, an ink adjusting porous body disposed on the outer periphery thereof in contact with the ink lead-out body is disclosed. A porous body for ink adjustment of a writing instrument, in which the capillary force is strong in the vicinity of the ink outlet and weaker in the outer part, is disclosed. (See Figure 7)
[0004]
[Problems to be solved by the invention]
But said(1)In the writing instrument (see FIG. 6), the capillary gap at the rear end of the ink occlusion body B is dense due to compression, but most of the other is straight, and the gap width (that is, capillary force) of the capillary gap is substantially uniform. It is. Therefore, when the pen nib is stored in a downward state, most of the reserved ink A in the ink occluding body B tends to concentrate below the ink occluding body B (that is, the front portion of the ink occluding body B). As a result, there is a risk that the ink leaks to the outside upon impact such as dropping or when the cap is removed.
[0005]
Furthermore, the conventional(1)In the writing instrument, the ink A is easily concentrated on the front part of the ink occluding body B, so that the ink A in the front part of the ink occluding body B returns smoothly into the ink tank C when the pressure in the ink tank C is reduced due to a temperature change or the like. Therefore, it is easy to allow air to enter the ink tank C while the ink A remains in the front portion of the ink occlusion body B. As a result, when the expansion / contraction of the air in the ink tank C is repeated, the residual ink A in the front portion of the ink occlusion body B gradually increases, and there is a possibility that ink may leak out from the pen tip side. .
[0006]
In addition, the conventional(1)In the writing instrument, since most of the stored ink A is distributed in the front part of the ink occluding body B and air tends to enter the rear part of the ink occluding body B, the ink occluding body B between the outer surface of the ink occluding body B and the inner surface of the shaft cylinder, An air passage D communicating with the outside air is required. If the air passage D does not exist, the ink may be pushed out to the outside when the air behind the ink occlusion body B expands due to a temperature rise or the like. Therefore, the conventional(1)In this writing instrument, by providing the air passage D, the ink occlusion body B is prevented from being trapped in the air so as to avoid ink leakage. However, in order to form the air passage D between the inner surface of the shaft cylinder and the outer surface of the ink occluding body B, not only the manufacturing effort is increased, but also the manufacturing cost is increased. In the case of construction, if grooves or ribs for the air passage are formed on the inner surface, sink marks are generated on the outer surface, which may cause poor appearance and poor airtightness when the cap is attached.
[0007]
In addition, the conventional(2)The writing instrument (see FIG. 7) is an ink outlet E (corresponding to the ink guiding member of the present application) by changing the capillary force of the ink adjusting porous body B (corresponding to the ink storage body B of the present application) in the radial direction. Even if it is set stronger in the vicinity and weaker in the outer part, the capillary force is uniform in the axial direction. Therefore, when stored with the pen tip facing down,(2)As in the writing instrument, the ink A was concentrated on the front part of the ink-adjusting porous body B, and there was a possibility that the ink leaked to the outside during impact such as dropping or removing the cap.
[0008]
The present invention solves the above-mentioned conventional problems, and aims to provide a direct liquid writing instrument that avoids an ink leakage accident and has a simple structure and reduced manufacturing costs.
[0009]
[Means for Solving the Problems]
(First invention) The present invention is a direct liquid writing instrument 1 in which an ink occlusion body 4 made of a porous material is disposed between a nib 2 and an ink tank 3, and the ink occlusion body 4 includes: There is an ink retaining part 5 that gradually increases the capillary force from the front to the rear.An ink guiding member 9 having a capillary force stronger than the capillary force of the ink occluding body 4 is disposed in the ink occluding body 4, and the rear end of the ink guiding member 9 is disposed behind the ink occluding body 4. The ink tank 3 is exposed or protruded from the end portion into the ink tank 3 to communicate between the ink tank 3 and the pen tip 2, and the ink in the ink tank 3 passes through the ink guide member 9 to the pen tip 2. Always supplied(Claim 1). (See FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5)
[0010]
In the direct liquid writing instrument 1 (Claim 1), the internal pressure of the ink tank 3 is increased in the pen tip downward state by the ink holding part 5 in which the capillary force is gradually increased from the front part to the rear part of the ink occlusion body 4. However, it is possible to prevent the ink from the ink tank 3 from being concentrated on the front portion of the ink occlusion body 4, and as a result, it is possible to avoid scattering and leakage of the ink to the outside at the time of impact such as dropping or removing the cap.
[0011]
・ Capillary force T, nib head pressure G
In the direct liquid writing instrument 1 according to claim 1, the capillary force T at an arbitrary position in the ink retaining portion 5 is expressed as a height H from the nib 2 to the arbitrary position in the pen tip downward state. And the difference between the capillary force T and the nib head pressure G is gradually increased from the front end of the ink holding part 5 toward the rear end of the ink holding part 5 (Claim 2). Is preferred. (See Figure 2)
[0012]
Thereby, the direct liquid type writing instrument 1 (Claim 2) distributes the overflow ink in the ink tank 3 when the internal pressure increases from the rear part of the ink occlusion body 4 (that is, the ink storage part 5) to the front thereof. Thus, the ink is concentrated on the front part of the ink occlusion body 4 and air does not enter the rear part of the ink occlusion body 4 as in the prior art.
[0013]
Therefore, when the ink tank 3 is depressurized due to a temperature change or the like, the direct liquid type writing instrument 1 (Claim 2) causes the ink in the ink occlusion body 4 (that is, the ink storage part 5) to be transferred from the front to the ink tank 3 in order. Return smoothly without interruption. As a result, air does not enter the ink tank 3 while the ink remains in the front portion of the ink occlusion body 4. That is, even if the air is repeatedly expanded and contracted in the ink tank 3, the ink does not remain in the front part of the ink occlusion body 4, so that an ink leakage accident at the time of impact such as dropping or removal of the cap is further increased. Can be prevented.
[0014]
Further, since the direct liquid writing instrument (Claim 2) does not trap air in the rear part of the ink occlusion body 4, it is possible to avoid ink leakage without providing a vent path as in the prior art. Therefore, the writing instrument itself has a simple structure, which can be provided at a low cost while suppressing manufacturing costs. In addition, when the member such as the shaft cylinder 7 is formed of a synthetic resin molded body, there is no possibility of causing poor appearance due to sink marks or airtightness when the cap is attached.
[0015]
In the pen tip downward state, the pen tip water head pressure G varies depending on the height H from the pen tip 2 to an arbitrary position of the ink holding unit 5, that is, G = (ink density ρ) × (gravity acceleration g ) × (height H) and acts in the pen tip direction (downward). Further, the capillary force T in the ink retaining portion 5 of the ink occlusion body 4 is set by the size of the voids of the porous material (that is, the density of the porous material) and acts in the ink tank direction (upward direction).
[0016]
Contrary to the present invention, when the capillary force T is smaller than the pen tip hydraulic head pressure G (that is, when T <G), when the pen tip is in the downward state, the rear portion of the ink occlusion body 4 as in the prior art. There is a possibility that the ink is reserved in preference to the front portion of the ink occlusion body 4. Furthermore, even when the difference (TG) between the capillary force T and the pen tip hydraulic head pressure G is gradually reduced from the front of the ink storage body 4 toward the rear of the ink storage body 4, There is a possibility that the ink is reserved in preference to the front portion of the ink storage body 4 over the rear portion of the ink storage body 4 as in the prior art.
[0017]
・ Liquid-tight part
Further, in the direct liquid writing instrument 1 according to claim 1 or 2, a liquid-tight portion 6 having a suitable axial length and a stronger capillary force than the ink retaining portion 5 is provided at the rear end of the ink retaining portion 5. (Claim 3) is preferable. (See Fig. 1 and Fig. 2)
[0018]
In the direct liquid writing instrument 1 (Claim 3), the liquid-tight portion 6 is always liquid-sealed with reserved ink. By the liquid seal, when the ink tank 3 is depressurized, when the ink is returned from the ink storage 5 to the ink tank 3, the air is stored in the ink tank 4 before all the ink in the ink occlusion body 4 is returned to the ink tank 3. 3 is prevented from being taken in. Accordingly, when the ink tank 3 is depressurized, the ink in the ink storage unit 5 can be returned to the ink tank 3 with priority over the air, that is, the ink is not changed while the ink remains in the ink storage unit 5. There is no risk of ink leaking from the front part of the ink occlusion body 4 without ink remaining in the holding part 5.
[0019]
Moreover, since the said liquid-tight part 6 has an appropriate length in the axial direction, the liquid sealing performance is ensured. The position of the liquid-tight portion 6 is preferably the rear end portion of the ink occlusion body 4, whereby the ink retention capacity of the ink reservation portion 5 formed in front of the liquid-tight portion 6 is maximized from the ink occlusion body 4. Can be obtained without waste.
[0020]
·compression
Further, in the direct liquid writing instrument 1 according to claims 1 to 3, the outer surface or the inner surface of the ink occlusion body 4 is compressed in the radial direction, and the capillary force is changed to a predetermined strength by changing the gap width of the capillary gap. It is preferable to set (Claim 4). (See FIGS. 1, 2, and 3)
[0021]
In the case of claim 4, it is preferable that the ink occlusion body 4 has a capillary gap distribution with a uniform gap width before compression, so that after compression, a desired capillary gap distribution ( That is, it is possible to reliably obtain a capillary force distribution.
[0022]
As a method for compressing the ink occlusion body 4, for example, when the ink occlusion body 4 is attached to the shaft cylinder 7, the ink occlusion body 4 is compressed by press-fitting the ink occlusion body 4 into the shaft cylinder 7, or the ink occlusion body 4 is A method of attaching the compressed unit to the shaft cylinder 7 is appropriate.
[0023]
Further, in order to achieve the configuration of claim 1 (the configuration in which the ink occlusion body 4 is provided with the ink retaining portion 5 that is gradually strengthened from the front to the rear thereof), or the configuration of claim 2 (the pen tip downward state) Then, the capillary force T at an arbitrary position in the ink holding part 5 is made larger than the nib head pressure G of the height H from the nib 2 to the arbitrary position, and the capillary force T and the pen In order to make the difference of the leading water head pressure G gradually larger from the front end of the ink retaining portion 5 toward the rear end of the ink retaining portion 5, the outer surface or inner surface in the radial direction of the ink occlusion body 4 is compressed into a tapered shape. It is preferable to change the gap width of the capillary gap (that is, the strength of the capillary force) in the axial direction.
[0024]
By the taper-shaped compression, the gap width of the capillary gap of the ink occlusion body 4 is continuously reduced from the front to the rear of the ink occlusion body 4, that is, the capillary force of the ink occlusion body 4 is reduced by the ink occlusion. The strength is continuously increased from the front part to the rear part of the body 4, and the capillary force can be easily and reliably set as in claim 1 or 2. This is advantageous in manufacturing. The tapered shape includes a substantially continuous change in which the diameter is increased (or reduced) in a fine step shape.
[0025]
The location where the ink occlusion body 4 is compressed into a tapered shape may be either the outer surface or the inner surface of the ink occlusion body 4. The type of compressing the outer surface of the ink occlusion body 4 is, for example, the outer side of the ink occlusion body 4. A configuration in which the diameter decreases from the front to the rear (FIG. 1) is exemplified. On the other hand, the type that compresses the inner surface of the ink occlusion body 4 includes, for example, the inner diameter of the center hole 41 of the ink occlusion body 4. The structure (FIG. 3) which becomes large diameter as it goes to a rear part from a front part is mentioned. In addition, the location where the ink occlusion body 4 is compressed in a tapered shape may be both the inner surface and the outer surface of the ink occlusion body 4.
[0026]
Moreover, it is preferable that the said liquid-tight part 6 (liquid seal part) forms the outer surface or inner surface of the rear part of the ink occlusion body 4 by straight compression. Thereby, the liquid-tight part 6 having an appropriate length in the axial direction can be easily and reliably configured, which is advantageous in manufacturing as in the case of compressing into the tapered shape (see FIGS. 1 and 2). In addition, the liquid-tight portion 6 can also be configured by a slit 73 provided in a partition wall 71 between the ink tank 3 and the ink storage body 4.
[0027]
・ Ink guide member
in frontClaim1'sIn the direct liquid writing instrument 1, an ink guiding member 9 having a capillary force stronger than the capillary force of the ink occlusion body 4 (that is, a capillary force stronger than the liquid-tight portion 6) is disposed in the ink occlusion body 4, Communicating between the ink tank 3 and the nib 2.
[0028]
Accordingly, the direct liquid writing instrument (claim)1), The ink in the ink tank 3 is always supplied to the pen tip 2 through the ink guiding member 9, and a rich ink discharge without handwriting interruption is obtained.
[0029]
Further, the ink guiding member 9 has a configuration in which the outer peripheral surface thereof is brought into direct contact with the inner surface of the ink occlusion body 4 (the ink holding portion 5 and the liquid-tight portion 6), and the ink exchange with the ink occlusion body 4 is directly performed. preferable. Thereby, at the time of writing, the residual ink in the ink occlusion body 4 can be directly supplied to the nib 2 without returning to the ink tank 3, and the ink in the ink occlusion body 4 can be quickly and reliably supplied from the nib 2. It can be consumed, and is effective in preventing ink from remaining in the ink occlusion body 4.
[0030]
By making the capillary force of the ink guiding member 9 stronger than the capillary force of the ink occlusion body 4 (the ink holding part 5 and the liquid tight part 6), the ink in the ink tank 3 has priority over the ink occlusion body 4. The ink is supplied to the ink guiding member 9 and is always in the ink supply state to the pen tip 2.
[0031]
Further, the rear end portion of the ink guide member 9 is exposed or protruded into the ink tank 3 from the rear end portion of the ink occlusion body 4.AndThus, the ink supply from the ink tank 3 to the nib 2 is made smooth.
[0032]
The material of the ink guiding member 9 is appropriate, for example, a fiber bundle resin or heat-sealed processed body, a synthetic resin extruded or injection-molded body having an axial ink lead-out path, and the like.
[0033]
(Second invention)
The present invention also relates to a direct liquid writing instrument 1 in which an ink occlusion body 4 made of a porous material is disposed between a nib 2 and an ink tank 3, and the outer surface of the ink occlusion body 4 is disposed in front of it. Compressed so that the diameter gradually decreases from the front to the rear, and provided with an ink retaining portion 5 in which the gap width of the capillary gap of the ink occlusion body 4 is gradually decreased from the front to the rear,An ink guiding member 9 having a capillary force stronger than the capillary force of the ink occluding body 4 is disposed in the ink occluding body 4, and the rear end portion of the ink guiding member 9 is the rear end of the ink occluding body 4. The ink tank 3 is exposed or protruded into the ink tank 3 to communicate between the ink tank 3 and the pen tip 2, and the ink in the ink tank 3 is transferred to the pen tip 2 through the ink guide member 9. Always supplied(Claim)5) As a requirement. (See Fig. 1 and Fig. 2)
[0034]
Accordingly, the direct liquid writing instrument 1 (Claim 6) is set stronger as the capillary force of the ink retaining portion 5 goes backward, so even if the internal pressure of the ink tank 3 rises in the pen tip downward state, The ink from the ink tank 3 is not concentrated on the front part of the ink occlusion body 4 and, as a result, it is possible to avoid scattering and leakage of ink to the outside at the time of impact such as dropping or removing the cap. In addition, since the strength of the capillary force is changed by compressing the outer surface of the ink occlusion body 4, the manufacturing becomes easy and the inexpensive direct liquid writing instrument 1 can be provided. Moreover, it is preferable to provide the liquid-tight part 6 of Claim 3 in the said direct liquid type writing instrument 1 (Claim 6).
[0035]
(Third invention)
The present invention also relates to a direct liquid type writing instrument 1 in which an ink occlusion body 4 made of a porous material is disposed between a nib 2 and an ink tank 3. A tapered compression portion 5 that gradually becomes smaller in diameter from the rear to the rear, and a straight compression portion 6 having a smaller diameter than the tapered compression portion 5 is provided at the rear end of the tapered compression portion 5;An ink guiding member 9 having a capillary force stronger than the capillary force of the ink occluding body 4 is disposed in the ink occluding body 4, and the rear end portion of the ink guiding member 9 is the rear end of the ink occluding body 4. The ink tank 3 is exposed or protruded into the ink tank 3 to communicate between the ink tank 3 and the pen tip 2, and the ink in the ink tank 3 is transferred to the pen tip 2 through the ink guide member 9. Always supplied(Claim)6) As a requirement. (See Fig. 1 and Fig. 2)
[0036]
The density of the ink occlusion body 4 made of a porous material can be continuously increased from the front portion toward the rear portion by the tapered compression portion 5, and the capillary force is increased from the front portion to the rear portion of the ink occlusion body 4. Can be strengthened continuously. As a result, ink enters the tapered compression portion 5 from the rear end portion thereof, and does not concentrate ink on the front portion of the ink occlusion body 4 (tapered compression portion 5). It is possible to avoid scattering and leakage of the ink. In addition, the capillary compression allows easy and reliable setting of the capillary force, which is advantageous in manufacturing.
[0037]
The straight compression section 6 is always liquid-sealed with ink. When the ink tank 3 is depressurized, when the ink is returned from the tapered compression portion 5 to the ink tank 3, air is removed before all the ink in the tapered compression portion 5 is returned to the ink tank 3. Intake into the ink tank 3 is prevented. Accordingly, when the ink tank 3 is depressurized, the ink in the tapered compression portion 5 can be returned to the ink tank 3 in preference to air, that is, the air remains without changing in the tapered compression portion 5. Since the ink does not remain in the tapered compression portion 5, there is no possibility that the ink leaks from the front portion of the ink occlusion body 4.
[0038]
(Fourth invention)
The present invention also relates to a direct liquid writing instrument 1 in which an ink occlusion body 4 made of a porous material is disposed between a nib 2 and an ink tank 3, and the inner surface of the ink occlusion body 4 is disposed in front of it. The ink retaining portion 5 is compressed so that the diameter gradually increases from the front to the rear, and the gap width of the capillary gap of the ink storage body 4 is gradually decreased from the front to the rear.An ink guiding member 9 having a capillary force stronger than the capillary force of the ink occluding body 4 is disposed in the ink occluding body 4, and the rear end portion of the ink guiding member 9 is the rear end of the ink occluding body 4. The ink tank 3 is exposed or protruded into the ink tank 3 to communicate between the ink tank 3 and the pen tip 2, and the ink in the ink tank 3 is transferred to the pen tip 2 through the ink guide member 9. Always supplied(Claim)7) As a requirement. (See Figure 3)
[0039]
Accordingly, the direct liquid writing instrument 1 (Claim 7) is set stronger as the capillary force of the ink retaining portion 5 goes backward, so even if the internal pressure of the ink tank 3 increases in the pen tip downward state, The ink from the ink tank 3 is not concentrated on the front part of the ink occlusion body 4 and, as a result, it is possible to avoid scattering and leakage of ink to the outside at the time of impact such as dropping or removing the cap. In addition, since the strength of the capillary force is changed by compressing the inner surface of the ink occlusion body 4, the production becomes easy and the inexpensive direct liquid writing instrument 1 can be provided. Moreover, it is preferable to provide the liquid-tight part 6 of Claim 3 in the said direct liquid type writing instrument 1 (Claim 7).
[0040]
(Fifth invention)
The present invention also relates to a direct liquid type writing instrument 1 in which an ink occlusion body 4 made of a porous material is disposed between a nib 2 and an ink tank 3. A tapered compression portion 5 that gradually increases in diameter from the portion toward the rear portion is provided, and a straight compression portion 6 that is larger in diameter than the tapered compression portion is provided at the rear end of the tapered compression portion 5.An ink guiding member 9 having a capillary force stronger than the capillary force of the ink occluding body 4 is disposed in the ink occluding body 4, and the rear end of the ink guiding member 9 is disposed behind the ink occluding body 4. The ink tank 3 is exposed or protruded from the end portion into the ink tank 3 to communicate between the ink tank 3 and the pen tip 2, and the ink in the ink tank 3 passes through the ink guide member 9 to the pen tip 2. Always supplied(Claim)8) As a requirement.
[0041]
As a result, the density of the ink occlusion body 4 made of a porous material can be continuously increased from the front part to the rear part by the tapered compression part 5 in the direct liquid writing instrument 1 (Claim 8). The capillary force can be continuously increased from the front to the rear of the ink occlusion body 4. As a result, ink enters the tapered compression portion 5 from the rear end portion thereof, and does not concentrate ink on the front portion of the ink occlusion body 4 (tapered compression portion 5). It is possible to avoid scattering and leakage of the ink. In addition, the capillary compression allows easy and reliable setting of the capillary force, which is advantageous in manufacturing.
[0042]
The straight compression section 6 is always liquid-sealed with ink. When the ink tank 3 is depressurized, when the ink is returned from the tapered compression portion 5 to the ink tank 3, air is removed before all the ink in the tapered compression portion 5 is returned to the ink tank 3. Intake into the ink tank 3 is prevented. Accordingly, when the ink tank 3 is depressurized, the ink in the tapered compression portion 5 can be returned to the ink tank 3 in preference to air, that is, the air remains without changing in the tapered compression portion 5. Since the ink does not remain in the tapered compression portion 5, there is no possibility that the ink leaks from the front portion of the ink occlusion body 4.
[0043]
・ Ink storage
The ink occlusion body 4 of the present invention (Claims 1 to 8) is a porous material. Specifically, the fiber bundle heat-bonded processed body, the fiber bundle resin processed body, and the felt resin. Examples thereof include a processed body, a felt heat-bonded processed body, a felt needle punch processed body, and an open-cell body made of synthetic resin.
[0044]
·Nib
Further, the nib 2 of the present invention (claims 1 to 8) may be any as long as it can eject the ink supplied from the ink guiding member 9, for example, a fiber bundle resin or Examples thereof include a heat-sealed processed body, a felt processed body, an open cell body made of a synthetic resin, an extruded body made of a synthetic resin, a ballpoint pen tip, a fountain pen type plate-like pen body, and a small tubular pen body. Alternatively, the pen tip 2 and the ink guide member 9 may be configured as a single member, and the ink guide member 9 may also serve as the pen tip 2.
[0045]
・ Ink tank
In addition, the ink tank 3 of the present invention (claims 1 to 8) is formed directly in the shaft cylinder 7 (see FIGS. 1 to 5), and a separate ink cartridge is provided at the rear end of the ink occlusion body 4. Or the like (see FIG. 7) or a configuration in which ink can be replenished from the rear end opening of the ink tank 3.
[0046]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0047]
(First embodiment)
1 and 2 show a first embodiment of the present invention / direct liquid writing instrument 1. FIG. 1 shows a state in which no ink is contained, and FIG. 2 shows a state in which the pen tip faces downward with ink retained.
[0048]
The direct liquid writing instrument 1 mainly includes a shaft cylinder 7 provided with an occlusion body accommodating portion 8 at the front and an ink tank 3 at the rear, the ink occlusion body 4 accommodated in the occlusion body accommodating portion 8, and the An ink guiding member 9 also serving as the pen tip 2 is provided in the ink occlusion body 4 in the axial direction.
[0049]
The shaft cylinder 7 is an injection-molded body made of a cylindrical synthetic resin (for example, polyethylene, polypropylene, etc.), and an occlusion body housing portion provided with a reduced diameter tapered inner surface that decreases in diameter toward the rear at the front portion thereof. 8 is provided, and an ink tank 3 which is a space portion for directly storing ink is provided via a partition wall 71 behind the occlusion body accommodating portion 8. A tail plug 74 is fixed to the rear end opening of the ink tank 3 of the shaft cylinder 7.
[0050]
In the occlusion body accommodating portion 8, an ink occlusion body 4 made of a heat-sealed body of a synthetic resin fiber bundle (for example, a polyester resin fiber bundle) is press-fitted from the front end opening. Before the ink occlusion body 4 is press-fitted into the occlusion body accommodating portion 8, the ink occlusion body 4 has a right cylindrical shape and has a uniform capillary gap (that is, a uniform capillary force). And since the inner surface of the said occlusion body accommodating part 8 is a taper-shaped (conical shape) inner surface which becomes a small diameter gradually as it goes back, the said ink occlusion body 4 is compressed along the taper-shaped inner surface, and from the front end The density of the fibers is continuously increased toward the rear end, and the ink retaining portion 5 (tapered compression portion) is formed in which the capillary force is gradually increased from the front portion toward the rear portion. Furthermore, a straight inner surface having a smaller diameter than the tapered inner surface is formed at the rear end of the tapered inner surface of the occlusion body accommodating portion 8, whereby the rear end portion of the ink occlusion body 4 is compressed into a straight shape. Thus, the liquid tight part 6 (straight compression part) is formed.
[0051]
A rod-shaped ink guide member 9 made of a resin processed body made of synthetic resin fibers (for example, polyester fiber, acrylic fiber, etc.) is pierced from the front side to the rear side of the ink storage body 4 through the shaft center of the ink storage body 4. Thus, the outer peripheral surface of the ink guiding member 9 is in direct contact with the inner peripheral surface of the ink occlusion body 4 (that is, the ink retaining portion 5 and the liquid-tight portion 6). A hard pointed member 91 is fixed to the rear end of the ink guiding member 9, thereby improving the insertability into the ink occlusion body 4. In addition, the front end of the ink guiding member 9 is appropriately formed and protrudes forward and outward as the pen tip 2.
[0052]
The partition wall 71 is formed with a cylindrical support portion 72 that holds the pointed member 91 at the rear end of the ink guide member 9 and projects into the ink tank 3. The cylindrical support portion 72 is provided with a slit 73 that allows the ink tank 3 and the ink guiding member 9 to communicate with each other and allows the ink tank 3 and the ink storage member 4 (liquid-tight portion 6) to communicate with each other.
[0053]
Also, a pen tip holding member 75 is fixed to the front end opening of the shaft tube 7 to hold the outer surface of the pen tip 2. The pen tip holding member 75 is provided with a rib 75a on the inner surface, and abuts and supports the front end of the ink storage body 4 to prevent the ink storage body 4 from falling off.
[0054]
FIG. 2 explains the operation of the direct liquid writing instrument 1 of FIG. When the height from the nib 2 to an arbitrary position of the ink holding part 5 is H, the capillary force at the arbitrary position in the ink holding part 5 is T, and the nib head pressure at the height H is G, Capillary force T is the nib head pressure GLargeThreshold (ie, T> G). Further, the difference (T−G) between the capillary force T and the pen tip hydraulic head pressure G increases from the front end of the ink retaining portion 5 toward the rear end of the ink retaining portion 5.
[0055]
Therefore, when the ink tank 3 is filled with ink and stored with the pen tip 2 facing downward, the ink in the ink tank 3 overflows to the ink occlusion body 4 according to the change in the internal pressure of the ink tank 3. The overflow ink is continuously held without allowing air to enter the liquid-tight portion 6 at the rear end of the ink occlusion body 4 and the ink storage portion 5 in front of the liquid-tight portion 6. As a result, when the ink tank 3 is depressurized, the return of ink from the ink storage unit 5 to the ink tank 3 is made smooth without interruption.
[0056]
(Second embodiment)
FIG. 3 shows a second embodiment of the present invention / direct liquid writing instrument 1.
[0057]
The direct liquid writing instrument 1 mainly includes a shaft cylinder 7 provided with an occlusion body accommodating portion 8 at the front and an ink tank 3 at the rear, the ink occlusion body 4 accommodated in the occlusion body accommodating portion 8, and the It comprises an ink guiding member 9 which also penetrates the ink occlusion body 4 in the axial direction and also serves as the pen tip 2.
[0058]
The shaft cylinder 7 is an injection-molded body of a cylindrical synthetic resin (for example, polypropylene, polyethylene, etc.), and has a taper-shaped insertion portion 81 having a small diameter toward the front at the front thereof. An annular occlusion body accommodating portion 8 is provided. An ink tank 3 that is a space portion for directly storing ink is provided via a partition wall 71 behind the occlusion body accommodating portion 8. A tail plug 74 is fixed to the rear end opening of the ink tank 3 of the shaft cylinder 7.
[0059]
The partition wall 71 is provided with a slit 73 that allows the ink tank 3 and the ink storage body 4 to communicate with each other, and the insertion portion 81 that protrudes forward on the side of the storage body housing 8 is integrally provided. . The insertion portion 81 includes a straight outer surface of the base portion and a tapered outer surface that tapers toward the front from the straight outer surface.
[0060]
In the occlusion body accommodating part 8, an ink occlusion body 4 made of a heat-sealed processed body of synthetic resin fiber bundle (for example, polyester fiber bundle) is press-fitted from the front end opening. Since the occlusion body accommodating portion 8 includes an insertion portion 81 at its axial center, the insertion portion 81 is inserted into the axial center of the ink occlusion body 4 when the ink occlusion body 4 is press-fitted. The inner surface of the axial center of the ink occlusion body 4 is compressed along the tapered outer surface and the straight outer surface of the insertion portion 81. The tapered outer surface constitutes an ink retaining part 5 (tapered compression part) in which the gap width of the capillary gap is continuously reduced toward the rear part and the capillary force is gradually increased from the front part to the rear part. The liquid-tight part 6 (straight compression part) is constituted by the straight outer surface.
[0061]
An ink guiding member 9 made of a resin processed body made of synthetic resin fibers (for example, polyester fibers, acrylic fibers, etc.) is inserted through the axis of the insertion portion 81. The rear end of the ink guiding member 9 projects into the ink tank 3, while the front end of the ink guiding member 9 projects outside from the front end of the shaft cylinder 7 as the pen tip 2.
[0062]
Similarly to the first embodiment, a pen tip holding member 75 is fixed to the front end opening of the shaft cylinder 7 to hold the outer surface of the pen tip 2. The nib holding member 75 is provided with a rib 75a on the inner surface, and the rib 75a supports the front end of the ink occlusion body 4 to prevent the ink occlusion body 4 from falling off.
[0063]
(Third embodiment)
FIG. 4 shows a third embodiment of the direct liquid writing instrument 1 according to the present invention. This is a structure in which the capillary gap is gradually made denser in advance from the front end toward the rear end before the ink occlusion body 4 is assembled in the shaft cylinder 7, and since the compression is not used, the shape is straight. It is cylindrical. The operational effects and other configurations of this embodiment are the same as those of the first embodiment.
[0064]
(Fourth embodiment)
FIG. 5 shows a fourth embodiment of the present invention / direct liquid writing instrument 1. The ink occlusion body 4 is composed of a plurality of annular bodies 4a, 4b, 4c, 4d, 4e, and 4f made of synthetic resin open-cell bodies having different density of capillary gaps, and has a large capillary gap (that is, a weak capillary force). In this configuration, the capillary 4 is stacked in the order from the front end to the rear end in order from the one 4f to the one 4a having a small capillary gap (that is, having a strong capillary force), and the capillary force is set to increase stepwise as it goes backward. The operational effects and other configurations of this embodiment are the same as those of the first embodiment.
[0065]
【The invention's effect】
The direct liquid type writing instrument of the present invention prevents the ink from the ink tank from being concentrated on the front part of the ink occlusion body even if the internal pressure of the ink tank rises in the pen tip downward state by the configuration of claim 1. As a result, it is possible to avoid scattering and leakage of the ink to the outside at the time of impact such as dropping or removing the cap.According to the first aspect of the present invention / direct liquid type writing instrument, the ink in the ink tank is always supplied to the pen tip via the ink guiding member, and the ink can be ejected without interruption of the handwriting.
[0066]
According to the present invention and the direct liquid type writing instrument, the overflow ink in the ink tank when the internal pressure is increased can be distributed from the rear part of the ink occlusion body to the front thereof according to the configuration of claim 2, as in the conventional case. Ink does not concentrate in the front part of the ink occlusion body and air does not enter the rear part of the ink occlusion body. Therefore, even if air is repeatedly expanded and contracted in the ink tank, the ink does not remain in the ink occlusion body, so that it is possible to further prevent an ink leakage accident upon impact such as dropping or removal of the cap.
[0067]
Furthermore, since the direct liquid writing instrument (Claim 2) does not trap air in the rear part of the ink occlusion body, it is possible to avoid ink leakage without providing a vent path as in the prior art. Therefore, the writing instrument itself has a simple structure, which can be provided at a low cost while suppressing manufacturing costs. In addition, when a member such as a shaft cylinder is formed of a synthetic resin molded body, there is no risk of causing appearance defects due to sink marks and airtight defects when the cap is attached.
[0068]
The direct liquid type writing instrument according to the present invention can return the ink of the ink occlusion body to the ink tank without interruption when the pressure of the ink tank is reduced, and the ink occlusion body does not remain in the ink occlusion body. There is no risk of ink leakage from the front.
[0069]
According to the present invention / direct liquid type writing instrument, the strength of the capillary force can be easily and reliably set by the configuration of claim 4, which is advantageous in manufacturing.
[0070]
[0071]
The present invention direct liquid writing instrument is claimed5Even if the internal pressure of the ink tank rises with the pen tip facing downward, the ink from the ink tank is not concentrated on the front part of the ink occlusion body. It is possible to avoid scattering and leakage of the ink. In addition, since the strength of the capillary force is changed by compressing the outer surface of the ink occlusion body, the manufacturing becomes easy and an inexpensive direct liquid writing instrument can be provided.
[0072]
The present invention direct liquid writing instrument is claimed6Therefore, since the tapered compression portion does not concentrate the ink on the front portion of the ink occlusion body, it is possible to avoid scattering and leakage of the ink to the outside at the time of impact such as dropping or removing the cap. In addition, the strength of the capillary force can be easily and reliably set by the tapered compression, which is advantageous in manufacturing. In addition, the straight compression portion allows the ink in the ink storage body to be returned back to the ink tank without interruption, and does not leave the ink in the ink storage body, and there is no risk of ink leaking from the front portion of the ink storage body.
[0073]
The present invention direct liquid writing instrument is claimed7Even if the internal pressure of the ink tank rises with the pen tip facing downward, the ink from the ink tank is not concentrated on the front part of the ink occlusion body. It is possible to avoid scattering and leakage of the ink. In addition, since the strength of the capillary force is changed by compressing the inner surface of the ink occlusion body, the manufacturing becomes easy and an inexpensive direct liquid writing instrument can be provided.
[0074]
The present invention direct liquid writing instrument is claimed8Therefore, since the tapered compression portion does not concentrate the ink on the front portion of the ink occlusion body, it is possible to avoid scattering and leakage of the ink to the outside at the time of impact such as dropping or removing the cap. In addition, the strength of the capillary force can be easily and reliably set by the tapered compression, which is advantageous in manufacturing. In addition, the straight compression portion allows the ink in the ink storage body to be returned back to the ink tank without interruption, and does not leave the ink in the ink storage body, and there is no risk of ink leaking from the front portion of the ink storage body.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view for explaining the operation of the first embodiment of the present invention.
FIG. 3 is a longitudinal sectional view showing a second embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing a third embodiment of the present invention.
FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the present invention.
FIG. 6 is a longitudinal sectional view showing a conventional example.
FIG. 7 is a longitudinal sectional view showing a conventional example.
[Explanation of symbols]
1 Direct liquid writing instrument
2 nibs
3 Ink tank
4 Ink occlusion body
4a-4f
Annulus
5 Ink retention part (tapered compression part)
6 Liquid tight part (straight compression part)
7 shaft cylinder
71 Bulkhead
72 Cylindrical support
73 slit
74 Tail plug
75 Nib holding member
75a rib
8 Occlusion body storage
81 Insertion section
9 Ink guide member
91 Pointed member
10 Ink
H Height from the pen tip to the desired position of the ink holding part
T Capillary force at the arbitrary position in the ink holding part
G Nib head pressure at height H

Claims (8)

  1. A direct liquid type writing instrument in which an ink occlusion body made of a porous material is arranged between the nib and the ink tank, and the ink occlusion body gradually increases the capillary force from the front to the rear. An ink guide member having a capillary force stronger than the capillary force of the ink occlusion body is provided in the ink occlusion body, and a rear end portion of the ink guide member is disposed at the rear end portion of the ink occlusion body. The ink tank is exposed or protruded into the ink tank and communicated between the ink tank and the pen tip, and the ink in the ink tank is constantly supplied to the pen tip through the ink guide member. A direct liquid writing instrument.
  2. In the state where the nib is downward, the capillary force at an arbitrary position in the ink holding portion is made larger than the nib head pressure at the height from the nib to the arbitrary position, and the capillary force and the nib head pressure are increased. The direct liquid writing instrument according to claim 1, wherein the difference is gradually increased from the front end of the ink storage portion toward the rear end of the ink storage portion.
  3. 3. The direct liquid writing instrument according to claim 1, wherein a liquid-tight portion having a capillary force stronger than that of the ink retaining portion and having an appropriate length in the axial direction is provided at the rear end of the ink retaining portion.
  4. The direct liquid writing instrument according to claim 1, 2, or 3, wherein the capillary force is set to a predetermined strength by compressing the outer surface or the inner surface of the ink occlusion body in the radial direction and changing the gap width of the capillary gap. .
  5. It is a direct liquid type writing instrument in which an ink occlusion body made of a porous material is arranged between the nib and the ink tank, and the outer surface of the ink occlusion body gradually decreases in diameter from the front to the rear. Compressed and provided with an ink retaining portion in which the gap width of the capillary gap of the ink occlusion body is gradually reduced from the front to the rear, and the capillary force in the ink occlusion body is stronger than the capillary force of the ink occlusion body An ink guide member having an ink guide member, the rear end portion of the ink guide member being exposed or protruded from the rear end portion of the ink occlusion body into the ink tank, and communication between the ink tank and the pen tip. The ink in the ink tank is always supplied to the pen tip through the ink guide member .
  6. It is a direct liquid type writing instrument in which an ink occlusion body made of a porous material is disposed between a nib and an ink tank, and the outer surface of the ink occlusion body has a taper that gradually decreases in diameter from the front to the rear. And a straight compression portion having a smaller diameter than the tapered compression portion at the rear end of the tapered compression portion, and a capillary force stronger than the capillary force of the ink occlusion body is provided in the ink occlusion body. An ink guide member having a rear end portion of the ink guide member is exposed or protrudes from the rear end portion of the ink occlusion body into the ink tank so that the ink tank communicates with the pen tip. The direct liquid writing instrument , wherein the ink in the ink tank is always supplied to the pen tip via the ink guide member .
  7. A direct liquid type writing instrument in which an ink occlusion body made of a porous material is disposed between a nib and an ink tank, and the inner surface of the ink occlusion body gradually increases in diameter from the front to the rear. The ink occlusion body is provided with an ink retaining portion in which the gap width of the capillary gap of the ink occlusion body is gradually reduced from the front portion toward the rear portion, and the capillary tube has a stronger capillary force than the capillary force of the ink occlusion body. An ink guiding member having force, and a rear end portion of the ink guiding member is exposed or protruded from a rear end portion of the ink occlusion body into the ink tank, and a gap between the ink tank and the pen tip is formed. A direct liquid writing instrument characterized in that the ink in the ink tank is always supplied to the pen tip via the ink guiding member .
  8. A direct liquid writing instrument in which an ink occlusion body made of a porous material is disposed between the nib and the ink tank, and gradually increases in diameter from the front to the rear on the inner surface of the ink occlusion body. A tapered compression portion is provided, and a straight compression portion having a diameter larger than that of the tapered compression portion is provided at the rear end of the tapered compression portion, and the capillary tube has a stronger capillary force than the capillary force of the ink storage member. disposed the ink guiding member having a force, the rear end of the ink guiding member is exposed or protruding from the rear end portion of the ink occlusion body to the ink tank, between the pen tip and the Lee Nkitanku A direct liquid writing instrument characterized in that the ink in the ink tank is always supplied to the pen tip via the ink guiding member .
JP24993797A 1997-08-29 1997-08-29 Direct liquid writing instrument Expired - Fee Related JP3917259B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24993797A JP3917259B2 (en) 1997-08-29 1997-08-29 Direct liquid writing instrument

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP24993797A JP3917259B2 (en) 1997-08-29 1997-08-29 Direct liquid writing instrument
CA 2246422 CA2246422A1 (en) 1997-08-29 1998-08-27 Direct liquid supply writing implement
CN98117657A CN1073021C (en) 1997-08-29 1998-08-28 Direct liquid supply writing implement
KR1019980035065A KR19990023957A (en) 1997-08-29 1998-08-28 Direct writing instruments
US09/141,560 US5967687A (en) 1997-08-29 1998-08-28 Direct liquid supply writing implement
DE1998602756 DE69802756T2 (en) 1997-08-29 1998-08-28 Pen with direct fluid supply
TW87114263A TW409101B (en) 1997-08-29 1998-08-28 Direct liquid supply writing implement
EP19980116356 EP0899128B1 (en) 1997-08-29 1998-08-28 Direct liquid supply writing implement

Publications (2)

Publication Number Publication Date
JPH1178352A JPH1178352A (en) 1999-03-23
JP3917259B2 true JP3917259B2 (en) 2007-05-23

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Family Applications (1)

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JP24993797A Expired - Fee Related JP3917259B2 (en) 1997-08-29 1997-08-29 Direct liquid writing instrument

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JP (1) JP3917259B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003213438A1 (en) * 2002-02-22 2003-09-09 Man-Hwa Baik A writing instrument
KR100932571B1 (en) 2004-09-14 2009-12-17 파일롯트 잉크 가부시키가이샤 Direct Writing Instruments
JP5089044B2 (en) * 2005-12-22 2012-12-05 ホン ファン,チアンHong Fan,Jiang Self-adjusting control structure for writing liquid
JP4848068B2 (en) * 2006-03-09 2011-12-28 パイロットインキ株式会社 Direct liquid writing instrument
JP4820701B2 (en) * 2006-07-19 2011-11-24 パイロットインキ株式会社 Direct liquid writing instrument

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