JP3917293B2 - Direct liquid writing instrument - Google Patents

Direct liquid writing instrument Download PDF

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Publication number
JP3917293B2
JP3917293B2 JP13137598A JP13137598A JP3917293B2 JP 3917293 B2 JP3917293 B2 JP 3917293B2 JP 13137598 A JP13137598 A JP 13137598A JP 13137598 A JP13137598 A JP 13137598A JP 3917293 B2 JP3917293 B2 JP 3917293B2
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JP
Japan
Prior art keywords
ink
occlusion body
body
writing instrument
ink tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP13137598A
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Japanese (ja)
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JPH11301168A (en
Inventor
茂 大池
Original Assignee
パイロットインキ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイロットインキ株式会社 filed Critical パイロットインキ株式会社
Priority to JP13137598A priority Critical patent/JP3917293B2/en
Priority claimed from CA 2246422 external-priority patent/CA2246422A1/en
Publication of JPH11301168A publication Critical patent/JPH11301168A/en
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Publication of JP3917293B2 publication Critical patent/JP3917293B2/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 an ink occlusion body made of a porous material is provided between a nib and an ink tank. In the present invention, “front” refers to the pen tip direction, and “rear” refers to the ink tank direction.
[0002]
[Prior art]
<Japanese Utility Model Publication No. 56-33739> Conventionally, Japanese Utility Model Publication No. 56-33739 discloses that an ink occlusion body having a capillary action that attaches a writing body to the tip of a shaft tube and comes into contact with the rear portion of the writing body. Installed in the shaft cylinder so that there can be an air passage communicating with the outside air between the inner surface of the shaft cylinder, a compression member is attached to the rear end of the ink storage body, and the capillary gap of the ink storage body in the mounting portion is A writing instrument in which the rear end portion of the ink occlusion body and the ink tank provided in the rear portion of the shaft cylinder are communicated with each other through a communication hole is disclosed.
[0003]
However, the writing instrument of the Japanese Utility Model Publication No. 56-33739 is a so-called batting type writing instrument in which the ink from the ink tank is once absorbed by the ink occlusion body and the absorbed ink is consumed from the pen tip. For this reason, the writing instrument of the above publication does not supply the ink in the ink tank directly to the pen tip via the ink guiding member or the like, so that the ink discharge amount from the pen tip is insufficient, the handwriting becomes thin, or the handwriting is It tends to be faint and smooth writing cannot be obtained over a long period of time.
[0004]
<Japanese Utility Model Publication No. 37-12939> Japanese Utility Model Publication No. 37-12939 discloses an ink storage section (corresponding to an ink tank of the present application) and felt waste or cotton in front of the ink storage section in an ink cylinder. A seat plate (corresponding to the partition wall of the present application) having a filled hole (corresponding to the ink storage body of the present application) and a small hole (corresponding to the communication hole of the present application) that separates the filling chamber and the ink storage part. ), And a long felt felt (corresponding to the ink guide member of the present application) that has been subjected to resin processing is provided in the seat plate and the filling chamber.
[0005]
The writing instrument disclosed in the Japanese Utility Model Publication No. 37-12939 is a direct liquid writing instrument in which an ink tank and a pen tip are directly connected by an ink guiding member without using an ink occlusion body, so that ink discharge from the pen tip is good. However, since the capillary force of the entire ink occlusion body is uniform, if it is stored for a long time with the pen tip facing downward, the ink tends to concentrate on the front part of the ink occlusion body, and impact such as dropping There is a risk of ink leaking outside when removing the cap.
[0006]
Moreover, the writing instrument of the Japanese Utility Model Publication No. 37-12939 is not only easy to concentrate ink on the front part of the ink occlusion body, but also because the contact between the outer surface of the ink guiding member and the inner surface of the ink occlusion body is unstable. When the inside of the ink tank is depressurized due to changes, etc., the ink in the front of the ink occlusion body does not return smoothly into the ink tank, and air remains in the front of the ink occlusion body, leaving air in the ink tank. Easy to capture. As a result, if the expansion and contraction of the air in the ink tank is repeated, the residual ink at the front portion of the ink occlusion body gradually increases, and there is a possibility that ink may leak out from the pen tip side.
[0007]
<Special Table No. 6-510491> Further, Japanese Patent Application No. 6-510491 discloses a capillary supply tube (corresponding to the ink guiding member of the present application) and a capillary reservoir (corresponding to the ink storage body of the present application). The capillary supply tube is fitted into the opening of the partition wall (corresponding to the center hole of the present application), the opening is closed, and the capillary supply tube fitted into the opening is used to supply air and ink. A direct liquid type writing instrument in which a gap (corresponding to the communication hole of the present application) for performing an alternating action is formed is disclosed.
[0008]
In general, the gap (that is, the communication hole) regulates the flow of ink and air between the ink tank and the ink occlusion body according to the size thereof, and has a high dimension for exchanging air and ink. This is where accuracy is required.
[0009]
If the size of the communication hole is excessively large, the capillary force is weakened, and when the ink tank is depressurized, smooth ink return from the ink occlusion body to the ink tank is hindered, and ink remains in the ink occlusion body. As it is, external air is taken into the ink tank, and the decompressed state in the ink tank is eliminated. When the internal pressure of the ink tank increases, the ink holding part cannot hold the overflow ink sufficiently, and the ink may leak out from the pen tip side.
[0010]
On the other hand, when the size of the communication hole is excessively small, the capillary force becomes strong, air intrusion into the ink tank in the reduced pressure state is suppressed, and smooth air changeability is hindered. The reduced pressure state is not resolved, and gradually after the ink consumption is started, the ink discharge amount from the pen tip becomes insufficient and the handwriting becomes thin.
[0011]
Therefore, in the direct liquid writing instrument of the above-mentioned Japanese translation of PCT publication No. 6-510491, since the ink guiding member is made of a porous material or a fibrous material, a plurality of void sizes in the ink guiding member fitted in the central hole of the partition wall. Vary widely, and the largest gap among them is the communication hole of the present application that performs the ventilation function.
[0012]
Therefore, in order to prevent the ink leakage from the pen tip caused by ink remaining in the ink occlusion body, in order to set the largest gap as the communication hole small, in consideration of the gap size variation, It is necessary to make the capillary gap of the ink guide member of the hole fairly close. As a result, the capillary force of the communication hole becomes too strong, the external air is not easily taken into the ink tank in the reduced pressure state, and the ink discharge performance from the pen tip gradually decreases from the start of ink consumption.
[0013]
[Problems to be solved by the invention]
The present invention solves the above-described conventional problems, and provides a direct liquid type writing instrument that satisfies both sufficient deterrence of ink leakage from the pen tip side and sufficient ink discharge performance from the pen tip. It is something to try.
[0014]
[Means for Solving the Problems]
(Outline) In the present invention, an ink occlusion body 4 made of a porous material is provided between the nib 2 and the ink tank 3, and the ink occlusion body 4 and the ink tank 3 communicate with each other. A direct liquid writing instrument 1 provided with a partition wall 5 having a communication hole 51 to be inserted, and a rod-shaped ink guide member 6 for supplying ink from the ink tank 3 to the nib 2 is inserted through the partition wall 5, and It is a requirement that the reduced diameter portion 41 for enhancing the capillary force is provided at the rear end portion of the ink occlusion body 4 (Claim 1).
[0015]
In the direct liquid writing instrument 1 according to the first aspect, the capillary force of the rear end portion of the ink occlusion body 4 is enhanced by the reduced diameter portion 41. As a result, even if the pen tip 2 is faced downward, the ink is always concentrated on the rear end portion (that is, the diameter-reduced portion 41) of the ink occlusion body 4, and the ink barrier that suppresses air intrusion when the ink tank 3 is depressurized there. Can be formed.
[0016]
Further, the direct liquid writing instrument 1 according to claim 1 has a configuration in which a rod-shaped ink guide member 6 that supplies ink from the ink tank 3 to the pen tip 2 is inserted in the reduced diameter portion 41 and the partition wall 5. The ink in the ink tank 3 can be supplied to the nib 2 via the ink guiding member 6 having a strong capillary force and an excellent ink guiding function without going through the ink occlusion body 4. The ink is continuously discharged without interruption, and the handwriting does not become thin or the handwriting does not fade, and a smooth writing feeling can be obtained.
[0017]
(Communication hole) Moreover, in the direct liquid writing instrument 1 according to the first aspect, the communication hole 51 is preferably a long hole having a groove width S of 0.03 mm to 0.15 mm (Claim 2). .
[0018]
The communication hole 51 penetrates the partition wall 5 in the axial direction, and the reduced diameter portion 41 and the ink tank 3 are communicated with each other through the communication hole 51. The communication hole 51 is an alternate path between ink and air that allows the ink and air to flow between the ink tank 3 and the ink storage body 4, and restricts the flow of ink and air by its size (ie, capillary force). To do.
[0019]
The shape of the communication hole 51 may be circular in cross section, but by making it a long hole (for example, a curved or straight elongated groove shape or slit shape), the capillary force can be reliably set and manufactured. This is advantageous.
[0020]
Further, in the present application, the communication hole 51 is not formed from a porous material or the like having a large gap variation but is formed from the partition wall 5 (non-porous body), so that an appropriate size (that is, an appropriate capillary force) is obtained. Can be set accurately.
[0021]
When the groove width S of the communication hole 51 is smaller than 0.03 mm, the capillary force of the communication hole 51 becomes excessively strong, so that air is not smoothly taken in from the outside into the ink tank 3 in a reduced pressure state. The decompressed state in the tank 3 is not eliminated, the ink discharge amount from the pen tip 2 is insufficient, and the handwriting may be faded.
[0022]
On the other hand, when the groove width S of the communication hole 51 is larger than 0.15 mm, the capillary force of the communication hole 51 becomes excessively weak, so that most of the ink in the ink occlusion body 4 returns to the ink tank 3. The external air easily enters the ink tank 3 in a reduced pressure state without resistance, and the ink tends to remain in the ink occlusion body 4.
[0023]
Further, the groove width S is 0.04 mm in that air can be smoothly taken into the ink tank 3 from the outside and ink residual in the ink storage 4 can be suppressed. The range of .about.0.1 mm is preferable, and the range of 0.04 mm to 0.07 mm is effective in terms of ensuring the above-described effects.
[0024]
(Reduced diameter portion) In the direct liquid writing instrument 1 according to claim 1 or 2, it is preferable that the inner surface of the reduced diameter portion 41 and the outer surface of the ink guide member 6 are in close contact (claim 3).
[0025]
Thereby, the ink in the reduced diameter portion 41 when the ink tank 3 is depressurized continuously without involving air in the ink tank 3 not only through the communication hole 51 but also through the ink guide member 6 in close contact with the reduced diameter portion 41. Thus, a large amount of ink does not remain on the pen tip 2 side of the ink occlusion body 4, and an ink leakage accident can be prevented in advance.
[0026]
The reduced diameter portion 41 is formed by compressing and deforming the outer peripheral surface of the rear end portion of the ink storage body 4 in the radial direction (specifically, inward or outward in the radial direction). Accordingly, the gap width of the capillary gap is smaller at the rear end portion (the reduced diameter portion 41) of the ink occlusion body 4 than at the other front portion, and the capillary force is set stronger than the other front portion. Specifically, the average capillary force of the reduced diameter portion 41 is preferably set to be approximately the same as the average capillary force of the communication hole 51. As a result, air can be more smoothly taken into the ink tank 3 under reduced pressure, and ink remaining in the ink occlusion body 4 can be sufficiently suppressed.
[0027]
(Partition Wall) The partition wall 5 is made of a non-porous material that partitions the ink tank 3 and the storage portion of the ink storage body 4, and includes a communication hole 51 that connects the ink tank 3 and the ink storage body 4, and ink. A center hole 52 through which the guide member 6 is inserted is provided, and the front surface thereof press-supports the rear end surface (that is, the reduced diameter portion 41) of the ink storage body 4 in the axial direction. Since the front surface of the partition wall 5 is in contact with the reduced diameter portion 41, the communication hole 51 and the reduced diameter portion 41 are connected so that ink can flow.
[0028]
Further, the outer surface of the ink guide member 6 can be contacted and supported on the inner surface of the center hole 52 of the partition wall 5 so that the ink guide member 6 can be stably fixed. Further, the partition wall 5 may be formed integrally with the ink tank 3 or the shaft cylinder 7, or may be configured by attaching a separate member to the ink tank 3 or the shaft cylinder 7 as shown in FIGS. May be.
[0029]
(Ink Occlusion Body) The ink occlusion body 4 has a function of temporarily holding overflow ink corresponding to a pressure change in the ink tank 3. When the inside of the ink tank 3 is in a pressurized state (when the internal pressure of the ink tank 3 increases due to a temperature change or the like), the ink in the ink tank 3 temporarily enters the ink occlusion body 4 through the communication hole 51 and the ink guide member 6. Retained.
[0030]
On the other hand, when the inside of the ink tank 3 is in a depressurized state (when the internal pressure of the ink tank 3 is reduced due to a temperature change or the ink is consumed from the nib 2), the ink in the ink occlusion body 4 passes through the communication hole. When the ink tank 3 is returned to the ink tank 3 through 51 and the inside of the ink tank 3 is in a reduced pressure state, most of the ink in the ink occlusion body 4 moves into the ink tank 3, and finally air is supplied from the outside to the ink tank. 3 is entered and the reduced pressure state is eliminated.
[0031]
Examples of the ink occlusion body 4 made of the porous material include a heat-bonded processed body of fiber bundles, a processed resin body of fiber bundles, a processed resin body of felt, a needle punch processed body of felt, and an open cell body of synthetic resin. Etc.
[0032]
(Ink guide member) The ink guide member 6 only needs to have at least an axial ink lead-out path that opens radially outward from the outer peripheral surface thereof. For example, a resin processed body of a fiber bundle, heat of the fiber bundle, and the like. A fusion-bonded body, a synthetic resin extrusion-molded body having an ink outlet groove in the axial direction, an injection-molded body, and the like are appropriately employed. In order to supply ink smoothly and smoothly to the nib 2, at least the capillary force of the ink guiding member 6 is set to be stronger than the capillary force of the reduced diameter portion 41 of the ink occlusion body 4 and the communication hole 51.
[0033]
(Pen Tip) The pen tip 2 may be any one as long as it is connected to the ink guide member 6 so as to be able to distribute ink and can discharge the ink supplied from the ink guide member 6 to the outside such as a paper surface. For example, a resin processed body of a fiber bundle, a heat-bonded processed body of a fiber bundle, a felt processed body, an open cell body of a synthetic resin, an extruded body of a synthetic resin, a ballpoint pen tip, a fountain pen type plate-shaped pen body, a thin tubular pen Such as the body. Alternatively, the pen tip 2 and the ink guide member 6 may be configured as a single member, and the ink guide member 6 may also serve as the pen tip 2.
[0034]
(Ink Tank) The ink tank 3 only needs to be connected to the reduced diameter portion 41 of the ink occlusion body 4 so that ink can be circulated, and specifically, a cylindrical body (for example, a shaft cylinder) that accommodates the ink occlusion body 4. 7, the occlusion body containing cylinder 8, the partition wall 5, the reduced diameter member 9 or the like), or a structure by attaching another member (for example, a removable and replaceable ink cartridge) attached to the cylindrical body. Etc.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0036]
First Embodiment FIGS. 1 to 4 show a direct liquid writing instrument 1 according to a first embodiment of the present invention. The direct liquid writing instrument 1 of the present embodiment mainly includes an occlusion body accommodation cylinder 8 that accommodates the ink occlusion body 4 therein, and the occlusion body accommodation cylinder 8 provided in the front portion and behind the partition wall 5 via the partition wall 5. A shaft cylinder 7 in which the ink tank 3 is formed, and an axially penetrating inside of the ink occlusion body 4 of the shaft cylinder 7, the rear end is exposed in the ink tank 3 and the front end is projected to the outside as the pen tip 2. And an ink guiding member 6.
[0037]
(Occlusion body accommodation cylinder) The said occlusion body accommodation cylinder 8 is a cylindrical body which hold | maintains the nib 2 in the front part, and accommodates the ink occlusion body 4 in the inside. A cylindrical diameter-reducing member 9 is fixed to the inner surface of the rear end portion of the occlusion body accommodation cylinder 8 so that the inner diameter of the rear part of the occlusion body accommodation cylinder 8 is set small.
[0038]
An ink occlusion body 4 made of a heat-sealed processed body of synthetic resin fiber bundles (for example, fiber bundles made of polyester resin aligned in the longitudinal direction) is inserted into the occlusion body housing cylinder 8 from the rear end opening. Press fit. At this time, in particular, the rear end portion of the ink occlusion body 4 is compressed radially inward by the reduced diameter member 9, and the reduced diameter portion 41 is formed there. Before the ink occlusion body 4 is press-fitted into the occlusion body accommodation cylinder 8, the ink occlusion body 4 has a straight cylindrical shape and has a uniform capillary gap (that is, a uniform capillary force). Therefore, the reduced diameter portion 41 at the rear end of the ink occlusion body 4 has a stronger capillary force than other portions of the ink occlusion body 4 due to compression deformation.
[0039]
The said occlusion body accommodation cylinder 8 hold | maintains the nib 2 so that airflow is possible in the taper front part. In addition, a rib 81 is provided on the inner surface of the occlusion body housing cylinder 8 to abut and support the front end of the ink occlusion body 4 to prevent the ink occlusion body 4 from falling off.
[0040]
(Ink guiding member) A rod-shaped ink guiding member 6 made of a resin processed body made of synthetic resin fibers (for example, polyester fiber, acrylic fiber, etc.) is attached to the axis of the ink storing body 4 from the front of the ink storing body 4. The ink guide member 6 is attached by being pierced backward and penetrated, and the outer peripheral surface of the ink guiding member 6 is in direct contact with the inner peripheral surface of the ink occlusion body 4. In particular, the outer surface of the ink guiding member 6 is formed radially with the inner surface of the rear end portion of the ink occlusion body 4 by a reduced diameter portion 41 formed by compressive deformation from the radially outer side to the inner side of the rear end portion of the ink occlusion body 4. Strong and close. Thereby, not only the ink connection between the ink occlusion body 4 and the ink guiding member 6 can be stabilized, but also the ink guiding member 6 can be prevented from falling off from the front of the shaft cylinder 7.
[0041]
Further, a hard pointed member 61 is fixed to the rear end of the ink guiding member 6, thereby improving the insertion property into the ink occlusion body 4. Further, the front end of the ink guiding member 6 is formed in an appropriate shape and protrudes forward and outward as the pen tip 2.
[0042]
(Diameter-reducing member) The diameter-reducing member 9 has a cylindrical front portion 91 that is press-fitted into the occlusion body housing cylinder 8 and is used to reduce the diameter of the rear end of the ink occlusion body 4. The rear portion 92 protrudes into the ink tank 3 and holds the pointed member 61 at the rear end of the ink guiding member 6. The cylindrical rear portion 92 is provided with a lateral hole 92a that allows the ink tank 3 and the ink guide member 6 to communicate with each other and allows the inside of the ink tank 3 and the rear surface of the partition wall 5 to communicate with each other. In addition, a flange portion 93 is connected between the cylindrical front portion 91 and the cylindrical rear portion 92, which includes a rear end of the occlusion body housing tube 8 and a step portion 71 on the inner surface of the shaft tube 7. Therefore, it is clamped in the axial direction.
[0043]
(Partition Wall) The partition wall 5 is a disk-like non-porous body, and is press-fitted and fixed in the reduced diameter member 9. As shown in FIGS. 1 and 3, a plurality (eight in this case) of axial grooves are provided on the inner surface of the reduced diameter member 9, and the groove having the inner surface of the reduced diameter member 9 When the partition wall 5 is press-fitted, a slit-shaped communication hole 51 is formed between the outer surface of the partition wall 5 and the inner surface of the reduced diameter member 9. The communication hole 51 is an arc-shaped or rectangular long hole having a uniform groove width S in cross-sectional shape, and the groove width S (that is, the radial groove width) is 0.04 mm to 0.07 mm. Is set to In addition, a central hole 52 is provided in the axial center of the partition wall 5, and the ink guide member 6 is provided therethrough.
[0044]
Second Embodiment FIGS. 5 and 6 show a direct liquid writing instrument 1 according to a second embodiment of the present invention. The direct liquid writing instrument 1 of the present embodiment mainly includes an occlusion body accommodation cylinder 8 that accommodates the ink occlusion body 4 therein, and the occlusion body accommodation cylinder 8 provided in the front portion and behind the partition wall 5 via the partition wall 5. A shaft cylinder 7 in which the ink tank 3 is formed, and an axially penetrating inside of the ink occlusion body 4 of the shaft cylinder 7, the rear end is exposed in the ink tank 3 and the front end is projected to the outside as the pen tip 2. And an ink guiding member 6.
[0045]
(Occlusion body accommodation cylinder) The said occlusion body accommodation cylinder 8 is a cylindrical body which hold | maintains the nib 2 in the front part, and accommodates the ink occlusion body 4 in the inside. A partition wall 5 also serving as a diameter-reducing member 9 is fixed to the inner surface of the rear end portion of the occlusion body housing cylinder 8 so that the inner diameter of the rear portion of the occlusion body housing cylinder 8 is set small.
[0046]
An ink occlusion body 4 made of a heat-sealed processed body of a synthetic resin fiber bundle (for example, a fiber bundle made of polyester resin aligned in the longitudinal direction) is press-fitted into the occlusion body housing cylinder 8 from the rear end opening. The At this time, in particular, the rear end portion of the ink occlusion body 4 is compressed radially outward by the front portion 91 of the reduced diameter member 9, and the reduced diameter portion 41 is formed there. Before the ink occlusion body 4 is press-fitted into the occlusion body accommodation cylinder 8, the ink occlusion body 4 has a straight cylindrical shape and has a uniform capillary gap (that is, a uniform capillary force). Therefore, the reduced diameter portion 41 at the rear end of the ink occlusion body 4 has a stronger capillary force than other portions of the ink occlusion body 4 due to compression deformation.
[0047]
Moreover, the said occlusion body accommodation cylinder 8 hold | maintains the nib 2 so that air circulation is possible in the taper front part. In addition, a rib 81 is provided on the inner surface of the occlusion body housing cylinder 8 to abut and support the front end of the ink occlusion body 4 to prevent the ink occlusion body 4 from falling off.
[0048]
(Partition Wall) The partition wall 5 is formed by integrally connecting a cylindrical front portion 91 and a flange portion 93. On the other hand, a plurality of (here, four) axial grooves are provided on the inner surface of the rear end portion of the occlusion body housing cylinder 8 as shown in FIG. When the flange portion 93 is press-fitted, a slit-shaped communication hole 51 is formed between the outer surface of the flange portion 93 and the inner surface of the occlusion body housing cylinder 8. The communication hole 51 is an arc-shaped long hole having a uniform groove width S in cross-sectional shape, and the groove width S (that is, the radial groove width) is set to 0.04 mm to 0.07 mm. ing. Further, a central hole 52 is provided in the axial center of the partition wall 5, and a rod-shaped ink guiding member 6 (for example, a resin processed body of synthetic resin fibers such as polyester fibers and acrylic fibers) is provided therethrough. .
[0049]
(Operation) In the direct liquid writing instrument 1 of the first and second embodiments, the ink in the ink tank 3 overflows and is absorbed by the ink occlusion body 4 as the internal pressure of the ink tank 3 increases. The overflow ink is continuously held from the reduced diameter portion 41 at the rear end of the ink occlusion body 4 to the ink occlusion body 4 in front of the reduced diameter portion 41 without interposing air. Therefore, when the pressure in the ink tank 3 is reduced, the ink return back from the front portion of the ink occlusion body 4 to the ink tank 3 can be made smooth without interruption of air.
[0050]
【The invention's effect】
The direct liquid writing instrument according to the present invention has the structure of claim 1 to suppress ink remaining at the front portion of the ink occlusion body, prevent ink leakage from the pen tip side, and obtain a sufficient ink discharge amount from the pen tip. be able to.
[0051]
The direct liquid writing instrument according to the present invention can set the capillary force of the communication hole to a desired strength by the configuration of claim 2, which is advantageous in manufacturing, prevents ink leakage from the pen tip side, and is sufficient from the pen tip. Ink ejection performance is satisfied at the same time without further variation.
[0052]
According to the direct liquid writing instrument of the present invention, the ink in the reduced diameter portion when the ink tank is depressurized is not limited to the communication hole, and the air in the ink tank is brought into close contact with the reduced diameter portion. The ink can be returned continuously without being entrained, the ink is not left in the front portion of the ink occlusion body, and an ink leakage accident can be prevented in advance.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG.
FIG. 3 is an enlarged cross-sectional view taken along line BB in FIG.
4 is an enlarged cross-sectional view taken along the line CC in FIG.
FIG. 5 is a longitudinal sectional view showing a second embodiment of the present invention.
6 is an enlarged sectional view taken along the line DD of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Direct liquid type writing instrument 2 Pen tip 3 Ink tank 4 Ink occlusion body 41 Reduction diameter part 5 Partition 51 Communication hole 52 Center hole 6 Ink guide member 61 Pointed member 7 Shaft cylinder 71 Step part 8 Occlusion body accommodation cylinder 81 Rib 9 Contraction Diameter member 91 Front part 92 Rear part 92a Side hole 93 Flange part S Groove width of communication hole

Claims (3)

  1. An ink occlusion body (4) made of a porous material is provided between the nib (2) and the ink tank (3), and both of them are provided between the ink occlusion body (4) and the ink tank (3). A direct liquid type writing instrument provided with a partition wall (5) provided with a communication hole (51) for communicating between them, a rod-like shape for supplying ink from the ink tank (3) to the pen tip (2) to the partition wall (5) And a reduced diameter portion (41) for enhancing the capillary force at the rear end of the ink occlusion body (4).
  2. The direct liquid writing instrument according to claim 1, wherein the communication hole (51) is a long hole having a groove width of 0.03 mm to 0.15 mm.
  3. The direct liquid writing instrument according to claim 1 or 2, wherein the inner surface of the reduced diameter portion (41) and the outer surface of the ink guide member (6) are brought into close contact with each other.
JP13137598A 1998-04-23 1998-04-23 Direct liquid writing instrument Expired - Fee Related JP3917293B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13137598A JP3917293B2 (en) 1998-04-23 1998-04-23 Direct liquid writing instrument

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP13137598A JP3917293B2 (en) 1998-04-23 1998-04-23 Direct liquid writing instrument
CA 2246422 CA2246422A1 (en) 1997-08-29 1998-08-27 Direct liquid supply writing implement
US09/141,560 US5967687A (en) 1997-08-29 1998-08-28 Direct liquid supply writing implement
TW87114263A TW409101B (en) 1997-08-29 1998-08-28 Direct liquid supply writing implement
CN98117657A CN1073021C (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
KR1019980035065A KR19990023957A (en) 1997-08-29 1998-08-28 Direct writing instruments
DE1998602756 DE69802756T2 (en) 1997-08-29 1998-08-28 Pen with direct fluid supply

Publications (2)

Publication Number Publication Date
JPH11301168A JPH11301168A (en) 1999-11-02
JP3917293B2 true JP3917293B2 (en) 2007-05-23

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JP13137598A Expired - Fee Related JP3917293B2 (en) 1998-04-23 1998-04-23 Direct liquid writing instrument

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN107028326A (en) 2016-01-19 2017-08-11 胜贸株式会社 Applicating implement

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