JP2000033795A - Direct liquid type writing instrument - Google Patents

Direct liquid type writing instrument

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Publication number
JP2000033795A
JP2000033795A JP10219810A JP21981098A JP2000033795A JP 2000033795 A JP2000033795 A JP 2000033795A JP 10219810 A JP10219810 A JP 10219810A JP 21981098 A JP21981098 A JP 21981098A JP 2000033795 A JP2000033795 A JP 2000033795A
Authority
JP
Japan
Prior art keywords
ink
guide
pen tip
occluding
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.)
Pending
Application number
JP10219810A
Other languages
Japanese (ja)
Inventor
Shigeru Oike
茂 大池
Original Assignee
Pilot Ink Co Ltd
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 Pilot Ink Co Ltd, パイロットインキ株式会社 filed Critical Pilot Ink Co Ltd
Priority to JP10219810A priority Critical patent/JP2000033795A/en
Priority claimed from CA 2246422 external-priority patent/CA2246422A1/en
Publication of JP2000033795A publication Critical patent/JP2000033795A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To satisfy simultaneously sufficient ink jet properties out of a pen point and sufficient ink leakage control properties out of the pen point side for a direct liquid type writing instrument with an ink occlusion body formed of a porous material between a pen point and an ink tank. SOLUTION: A partition 5 is formed between an ink occlusion body 4 and an ink tank 3. An ink guide member of a bar-shaped porous material for feeding ink from the ink tank 3 to a pen point 2 is formed running through the ink occlusion body 4 and the partition 5. The inner face of the ink occlusion body 4 is brought into contact with the outer face of the ink guide member 6. An ink discharge line 61 with its front end positioned in the vicinity of the front end of the pen point 2 and its rear end opened in the ink tank 3 is formed inside the ink guide member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a direct liquid writing instrument. More specifically, the present invention relates to a direct liquid writing instrument provided with an ink occluding body made of a porous material between a pen tip and an ink tank. In the present invention, “front” refers to the pen tip direction,
"Back" refers to the direction of the ink tank.

[0002]

2. Description of the Related Art Conventionally, between a pen tip and an ink tank,
2. Description of the Related Art As an ink holding unit that temporarily holds overflowing ink when the internal pressure of an ink tank rises, a direct liquid writing implement having a configuration in which an ink occluding body made of a porous material is provided is known.
(See, for example, Japanese Utility Model Publication No. 37-12939,
No. 510491)

<Japanese Utility Model Publication No. 37-12939> Japanese Utility Model Publication No. 37-12939 discloses that an ink reservoir (corresponding to an ink tank of the present application) and felt dust or cotton in front of the ink reservoir are provided in an ink cylinder. A seat plate (corresponding to a partition wall in the present application) in which a small hole (corresponding to a communication hole in the present application) for separating a filled filling chamber (corresponding to the ink occluding body of the present application) from the filling chamber and the ink storage section is formed. ), And a fountain pen felt pen in which an elongated felt (corresponding to the ink guide member of the present invention) which has been subjected to resin processing is penetrated in the seat plate and the filling chamber.

[0004] The direct liquid writing instrument disclosed in 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 guide member without using an ink absorbing member. However, even if the ink discharging property from the pen tip is better than that of the type that does not penetrate the ink occluding body, the ink discharging property is still not enough in consideration of sufficient ink leakage prevention.

[0005] This is because it is difficult to accurately and uniformly set the size of each of the capillaries in the ink occlusion body made of a porous material, even if it is desired to set the size of the spaces uniformly distributed. Tend to vary widely. In particular, in a capillary space having a large void size, it does not function as a temporary ink holding unit. Due to the presence of the large capillary space, the ink holding function of the entire ink occluding body is reduced, and an ink leakage accident is likely to occur. Therefore, in order to effectively form the ink holding portion on the entire ink occluding body, it is necessary to previously set the entire capillary gap densely. Therefore, in the conventional direct liquid type writing instrument, in consideration of sufficient ink leakage prevention, since the capillary gap of the ink occluding body is set densely as a whole, air is not smoothly taken into the ink tank in a reduced pressure state. As a result, the ink dischargeability from the pen tip is reduced, resulting in thin handwriting or faint handwriting.

In addition, the direct liquid writing implement of the above publication has a configuration in which the ink guide member is simply made of a porous material.
There is a limit to quickly releasing abundant ink from the ink tank to the pen tip.

Further, in the direct liquid writing instrument disclosed in Japanese Utility Model Publication No. 37-12939, since the capillary force of the entire ink occluding body is uniform, if the ink occluding body is stored for a long time in a state where the pen tip is downward, the ink occluding body becomes ineffective. The ink tends to concentrate on the front,
The ink may leak to the outside at the time of impact such as dropping or when removing the cap.

In addition, the direct liquid writing implement disclosed in the above publication not only easily concentrates the ink on the front portion of the ink occluding body, but also has a problem that the contact between the outer surface of the ink guiding member and the inner surface of the ink occluding body is unstable. When the pressure inside the ink tank is reduced due to factors such as the above, the ink at the front of the ink storage body does not return smoothly to the ink tank, and air is taken into the ink tank while the ink remains at the front of the ink storage body. Cheap. As a result, when the expansion and contraction of the air in the ink tank is repeated, the residual ink at the front of the ink occluding body gradually increases, and finally there is a possibility that the ink may leak from the pen tip side.

Japanese Patent Application Laid-Open No. Hei 6-510490 discloses a capillary supply pipe (corresponding to the ink guide member of the present invention) which is provided with a capillary liquid reservoir (corresponding to the ink absorbing body of the present invention). (Corresponding to the central hole of the present application) by directly contacting the capillary feed tube with the opening of the partition (corresponding to the partition of the present application).
The capillary (which is a communication hole according to the present invention) has a capillary force higher than that of the capillary reservoir and has a function of replacing air and ink by the capillary supply pipe fitted in the opening. ) Is disclosed.

[0010] Generally, the communication hole (gap) controls the flow of ink and air between the ink tank and the ink occluding body.
It is regulated by its size, and is a place where high dimensional accuracy is required in exchanging ink with air.

If the size of the communication hole is excessively large, the capillary force of the communication hole is weakened.
The smooth return of the ink from the ink occluding body to the ink tank is hindered, and external air is taken into the ink tank with the ink remaining in the ink occluding body, thereby eliminating the reduced pressure state in the ink tank. When the internal pressure of the ink tank rises, the ink holding unit cannot sufficiently hold the overflowing ink, and the ink may leak from the pen tip side.

On the other hand, if the size of the communication hole is excessively small, the capillary force is increased, and the intrusion of air into the ink tank under reduced pressure is suppressed, and smooth air exchange is impeded. The depressurized state in the ink tank is not eliminated, and the amount of ink discharged from the pen tip becomes short, and the handwriting becomes thin or blurred gradually after the ink consumption starts.

Accordingly, the above-mentioned Japanese Patent Application Laid-Open No. Hei 6-510491
In the direct liquid writing instrument of the publication, since the ink guide member is made of a porous material such as a fiber material, a plurality of void sizes in the ink guide member fitted into the center hole of the partition wall widely vary, and among them, the largest void is provided. Are the communication holes of the present application that have a ventilation action.

Therefore, in order to prevent the ink from leaking from the pen tip side caused by the ink remaining in the ink occluding body, the largest void serving as the communication hole is set small in consideration of the variation in the void size. In advance, it is necessary to make the capillary gap of the ink guide member in the center hole considerably dense. As a result, the capillary force of the communication hole becomes too strong, the external air is not easily taken into the ink tank under reduced pressure, and the reduced pressure inside the ink tank cannot be sufficiently eliminated. Decreases ink ejection from the front.

In addition, since the ink guide member in the direct liquid writing implement of the above publication is made of a porous material or a fibrous material and has a high capillary force as a whole, abundant ink is not quickly supplied to the pen tip. It is easy to cause thin handwriting and faint handwriting.

[0016]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a sufficient ink discharge property from the pen tip and a sufficient suppression property of ink leakage from the pen tip side. At the same time, it is intended to provide a satisfactory direct liquid writing instrument.

[0017]

The present invention provides a pen tip 2
An ink storage body 4 made of a porous material is provided between the ink storage body 4 and the ink tank 3; a partition wall 5 is provided between the ink storage body 4 and the ink tank 3; A direct liquid type in which an ink guide member 6 made of a rod-shaped porous material for supplying ink from the ink tank 3 to the pen tip 2 is penetrated, and the inner surface of the ink storage body 4 and the outer surface of the ink guide member 6 are brought into close contact. In the writing implement 1, an ink lead-out path 61 having a front end located near the front end of the pen tip 2 and a rear end opening to the ink tank 3 is provided in the ink guide member 6 (claim 1). And

In the structure of the first aspect, the structure which is disadvantageous to the ink lead-out property (that is, the capillary gap of the ink occluding body 4 is set densely in advance so as to obtain sufficient suppression of ink leakage from the pen tip 2 side). And that the ink guide member 6 made of a porous material is used), the ink is drawn out from the ink tank 3 to the pen tip 2 quickly and abundantly by the ink outlet path 61 inside the ink guide member 6. As a result, an appropriate amount of ink is continuously discharged from the pen tip 2, so that thin handwriting or faint handwriting does not occur. Therefore,
A direct liquid writing implement that does not degrade the ink retaining function of the ink occluding body 4 and satisfies a sufficient suppression of ink leakage from the pen tip 2 and also a sufficient ink discharge property from the pen tip 2. 1 can be provided.

The porous materials forming the ink occluding member 4 and the ink guiding member 6 include a heat-fused body of a fiber bundle, a resin processed body of a fiber bundle, a resin processed body of felt,
Needle punched bodies of felt, continuous pores of synthetic resin, continuous pores of metal, continuous pores of ceramic, and the like can be given.

In the direct liquid writing implement 1 of the first aspect, the capillary force of the outer peripheral wall of the ink guide member 6 is set to be larger than the capillary force of the ink storage body 4 and the capillary force of the ink outlet path 61. (Claim 2) is preferred.

The outer peripheral wall of the ink guide member 6 is in close contact with the inner surface of the ink occluding member 4 and mainly serves to smoothly move the ink in the ink occluding member 4 in the front-rear direction. By setting it larger than the capillary gap of the ink occluding body 4, its function is sufficiently exhibited. Further, the ink outlet path 61 inside the ink guide member 6 has a smaller capillary force than the outer peripheral wall of the ink guide member 6,
This has a function to quickly and abundantly discharge ink from the ink tank 3 to the pen tip 2.

Therefore, when the pressure in the ink tank 3 is reduced due to the consumption of ink during writing, the ink in the ink occluding body 4 moves along the outer peripheral wall of the ink guide member 6. The ink continuously returns to the tank 3 smoothly, and ink remaining in the ink storage body 4 is suppressed.
At the same time, at the time of writing, the ink from the ink tank 3 is abundantly discharged from the pen tip 2 by the ink outlet path 61.

It is sufficient that the ink outlet path 61 has a capillary force lower than that of the outer peripheral wall. For example, an axial hole (for example, having a gap size of 5 mm or more) having almost no capillary force is provided. A configuration in which a separate member having an axial hole or groove with a gap dimension set to have a weaker capillary force than the outer peripheral wall is inserted into the axis of the ink guide member 6, or A configuration in which another member made of a low-density porous material is inserted into the axial center so as to have a weaker capillary force than the outer peripheral wall, or the like can be given.

The direct liquid writing instrument 1 according to claim 1 or 2.
In the above, it is preferable to provide a liquid storage portion 92a at the rear end of the ink guide member 6 for liquid sealing the rear end opening of the ink outlet passage 61 (claim 3).

Ink is always stored in the liquid storage portion 92a, and the rear end opening of the ink outlet path 61 is liquid-sealed by the stored ink. That is, even when the ink in the ink tank 3 is low and the writing implement is in the state between the horizontal state and the pen tip 2 in the vertical upward state, the rear end opening of the ink outlet path 61 is liquid-sealed. . Thereby, it is possible to always fill the inside of the ink lead-out path 61 with the ink without making air easily enter the ink lead-out path 61. As a result, even when the pen tip 2 is in a state other than the downward state, stable ink ejection properties can be maintained.

The specific configuration of the liquid storage section 92a is as follows.
For example, a small gap (that is, the liquid storage portion 9) is provided between the rear end surface of the ink guide member 6 where the ink outlet path 61 is opened and the outer peripheral surface near the rear end of the ink guide member 6 connected to the rear end surface.
A configuration in which the shape is surrounded by a bottomed cylindrical portion 92 to form 2a) is mentioned.

In the direct liquid writing implement 1 according to claim 1, a pen tip 2 made of a porous material is provided at a front end of the ink guide member 6, and a front end of the ink outlet path 61 and a front end of the pen tip 2 are provided. Thickness T between 1mm and 20mm
(Claim 4) is preferable.

When the thickness T is smaller than 1 mm,
There is a possibility that the ink may flow out of the pen tip 2 excessively, or the pen tip 2 may be worn out by writing, and the ink outlet path 61 may be opened from the pen tip 2 in a short period of time, causing ink to flow out. On the other hand, when the thickness T is larger than 20 mm,
There is a risk that ink dischargeability from the pen tip 2 will be impaired, resulting in thin handwriting or faint handwriting.

The configuration of the pen tip 2 and the ink guide member 6 is such that the pen tip 2 and the ink guide member 6 are formed as one member,
A configuration in which the front end of the ink guide member 6 also serves as the pen tip 2 or a configuration in which the pen tip 2 formed of a separate member is attached to the front end of the ink guide member 6 can be exemplified.

Examples of the nib 2 made of the porous material include a resin processed body of a fiber bundle, a resin processed body of a felt, a needle punched body of a felt, a continuous porous body of a synthetic resin, a continuous porous body of a metal, Examples include ceramic continuous pores. The capillary force of the pen tip 2 is preferably set to be equal to or larger than the capillary force of the outer peripheral wall of the ink guide member 6 in order to further improve the ink dischargeability.

[0031] In the direct liquid writing implement 1 of the first, second, third or fourth aspect, a reduced diameter portion 41 for enhancing a capillary force is provided at a rear end of the ink occluding body 4 (the fifth aspect).
Is preferred.

The capillary force at the rear end of the ink occluding body 4 is enhanced by the reduced diameter portion 41. Thereby, the pen tip 2
Even if is turned downward, the ink is always concentrated on the rear end portion (that is, the reduced diameter portion 41) of the ink occluding body 4, and an ink barrier that suppresses air intrusion when the ink tank 3 is depressurized can be formed there. . As a result, the ink in the ink occluding body 4 smoothly returns to the ink tank 3 in a reduced pressure state, and almost no ink remains in the ink occluding body 4, so that the leakage of the ink from the pen tip 2 side can be further prevented.

Further, in the direct liquid writing instrument 1, a rod-shaped ink guide member 6 for supplying ink from the ink tank 3 to the pen tip 2 is inserted through the ink storage body 4 (diameter reduced portion 41) and the partition wall 5. With this configuration, the ink in the ink tank 3 is transferred to the pen tip 2 without passing through the ink occluding body 4, and the ink guiding member 6 is excellent in the ink guiding function and the ink discharging function.
The ink can be supplied via the pen tip 2 and the abundant ink is continuously discharged without interruption, and the handwriting is not thinned and the handwriting is not blurred, and a smooth writing feeling is obtained. Can be

The reduced diameter portion 41 is formed by compressively deforming the outer peripheral surface of the rear end portion of the ink occluding body 4 in the radial direction (specifically, radially inward or outward). Thereby,
At the rear end (the reduced diameter portion 41) of the ink occluding body 4, the gap dimension of the capillary gap is smaller than that of the other parts in front, and the capillary force is set stronger than the other parts in front. In particular,
It is preferable that the average capillary force of the reduced diameter portion 41 is set to be substantially equal to the average capillary force of the communication hole 51. Thereby, the intake of air into the ink tank 3 in a reduced pressure state becomes smoother, and the remaining of the ink in the ink occluding body 4 can be sufficiently suppressed. The reduced diameter portion 41 is
It is preferable to have an appropriate length, thereby ensuring the liquid sealing performance.

Further, it is preferable to provide a tapered portion having a diameter gradually increasing forward from the reduced diameter portion 41 in front of the reduced diameter portion 41 provided at the rear end of the ink occluding body 4. By the tapered portion, the amount of compression of the ink occluding body 4 can be changed, and the capillary force of the ink occluding body 4 can be set to gradually increase from the front to the rear end of the ink occluding body 4. Thereby, the ink overflowing from the ink tank 3 in the pressurized state can be continuously distributed to the rear side in the ink storage body 4, and it is possible to prevent air from entering the rear part of the ink storage body 4. Therefore, most of the ink in the ink occluding body 4 returns smoothly to the ink tank 3 in the reduced pressure state without remaining, and the ink leakage accident from the pen tip 2 side can be further prevented.

The direct liquid writing implement 1 according to claim 1, 2, 3, 4, or 5, wherein the partition wall 5 has an ink occluding material 4
0.02m to make the rear end of the ink tank 3 communicate with the ink tank 3.
It is preferable to provide a slit-shaped communication hole 51 having a groove width S of m to 0.25 mm (claim 6). As a result, a sufficient ink discharging property from the pen tip 2 and a sufficient ink leakage suppressing property can be obtained more reliably.

The groove width S of the communication hole 51 is 0.02 m.
When the diameter is smaller than m (millimeter), the capillary force of the communication hole 51 becomes excessively strong.
As a result, air is not taken in smoothly from the outside, and as a result, the depressurized state in the ink tank 3 is not eliminated, the amount of ink discharged from the pen tip 2 becomes insufficient, and handwriting may be blurred.

On the other hand, when the groove width dimension S of the communication hole 51 is 0.25
If the diameter is larger than mm (millimeter), the capillary force of the communication hole 51 becomes excessively weak. Therefore, before most of the ink in the ink occluding body 4 returns to the ink tank 3, the external air is depressurized and the ink tank 3 is depressurized. The ink easily enters the ink storage body 4 without resistance, and the ink tends to remain in the ink storage body 4. Therefore, the ink retaining function of the ink occluding body 4 may be gradually reduced, and finally, the ink may leak to the outside.

Further, the groove width dimension S is determined by the size of the communication hole 5 in the case of ink having a relatively low surface tension (for example, oil-based ink).
1 requires 0.02 mm to
The range is preferably 0.15, and in the case of an ink having a relatively high surface tension (for example, an aqueous ink), 0.03 mm to 0.1 mm.
A range of 2 mm is preferred.

In the case of an ink having a relatively low surface tension (for example, a whiteboard ink having a surface tension in the range of 20 mN / m to 25 mN / m (millinewton / meter)), 0.03 mm to 0.1 mm Is preferable, whereby air can be more smoothly taken into the ink tank 3 from the outside, and
It is possible to suppress the ink remaining in the ink storage body 4.
More preferably, the groove width dimension S is effective in the range of 0.03 mm to 0.08 mm from the viewpoint of ensuring the above-mentioned effects.

The communication hole 51 penetrates the partition wall 5 in the axial direction, and the rear end portion (reduced diameter portion 41) of the ink storage body 4 and the ink tank 3 are connected through the communication hole 51. Are in communication. The communication hole 51 allows ink and air to flow between the ink tank 3 and the ink occluding body 4.
It is an alternate path between ink and air, and regulates the flow of ink and air by its size (ie, capillary force).

By making the shape of the communication hole 51 into a slit shape, it is possible to reliably set the capillary force, which is advantageous in manufacturing. The communication hole 51 is formed in a slit shape extending in the axial direction and the circumferential direction between the outer surface of the partition wall 5 and the inner surface of the barrel 7 (for example, the inner surface of the barrel 7, the inner surface of the holding cylinder 8, and the inner surface of the reduced diameter member 9). It is preferable that the groove is formed (that is, formed by a gap between two joined members), so that even if the groove width dimension S is extremely small as compared with the case where a slit is formed in one member, it is easier to manufacture. can do.

Further, in the present application, the communication hole 51 is not formed from a porous material having a large gap variation, but is formed by a partition wall 5 or the like made of a non-porous material, so that the communication hole 51 has an appropriate size (that is, an appropriate size). Capillary force) can be set accurately.

Others (Partition) The partition 5 is made of a non-porous material that separates the ink tank 3 and the accommodating portion of the ink occluding body 4, and is a communication hole communicating the ink tank 3 and the ink occluding body 4. 51 and a central hole 52 through which the ink guide member 6 is inserted, and the front surface of the front surface supports the rear end surface (that is, the reduced diameter portion 41) of the ink occluding member 4 in the axial direction by pressure. 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.

It is preferable that the inner surface of the center hole 52 of the partition wall 5 closely supports the outer surface of the ink guide member 6 in the entire circumference, and the ink guide member 6 is stably fixed. This makes it possible to form a reliable slit-shaped communication hole 51 in the partition wall 5 other than the center hole 52 without forming the unstable communication hole 51 in the center hole 52. Further, the partition wall 5 may be formed integrally with the ink tank 3 and the shaft cylinder 7, or may be formed by attaching a separate member to the ink tank 3 and the shaft cylinder 7 as shown in FIGS. May be done.

(Ink Tank) The ink tank 3
May be connected to the reduced diameter portion 41 of the ink occluding body 4 so that the ink can be circulated. Specifically, a cylindrical body (for example, the shaft cylinder 7, the holding cylinder 8, the partition wall 5) accommodating the ink occluding body 4 is provided. , Or a member formed integrally with the reduced diameter member 9 or the like, or a structure formed by attaching another member (for example, a detachable and replaceable ink cartridge) to be attached to the cylindrical body.
Can be mentioned.

[0047]

Embodiments of the present invention will be described with reference to the drawings.

<First Embodiment> FIGS. 1 to 5 show a direct liquid writing implement 1 according to a first embodiment of the present invention. The direct liquid type writing instrument 1 of the present embodiment mainly includes a holding cylinder 8 for accommodating the ink occluding body 4 therein, a holding cylinder 8 provided at a front portion, and an ink tank 3 via a partition 5 behind the holding cylinder 8. A shaft barrel 7 formed and an ink guide member axially penetrated into the ink storage body 4 of the barrel 7, the rear end of which is exposed in the ink tank 3, and the front end of which is projected outside as the pen tip 2. 6

(Holding Tube) The holding tube 8 is a cylindrical body in which a front tapered portion 81 and a rear cylindrical portion 82 are integrally formed by molding a synthetic resin. The tapered portion 81 holds the pen tip 2, and the cylindrical portion 82 accommodates the ink occluding body 4 therein, and the outer surface thereof is press-fitted and fixed to the inner surface of the front portion of the barrel 7. A flange 83 is provided on the outer peripheral surface of the front part of the cylindrical portion 82, and the flange 83 is in contact with the opening edge of the shaft cylinder 7. Further, a support rib 81a is provided on the inner surface of the tapered portion 81 of the holding cylinder 8, and the support rib 81a is in contact with and supported by the front end of the ink occluding member 4, thereby preventing the ink occluding member 4 from falling off. Further, a cylindrical reduced diameter member 9 is provided on the inner surface of the rear portion of the holding cylinder 8.
Is press-fitted and fixed, and the inner diameter of the inner surface of the rear part of the holding cylinder 8 is set small.

(Ink Occlusion Body) In the holding cylinder 8, the ink occlusion body 4 made of a heat-sealed body of a synthetic resin fiber bundle (for example, a fiber bundle made of polyester resin and aligned in the longitudinal direction) is provided. Will be accommodated.

The rear end portion of the ink occluding body 4 is compressed radially inward by the diameter reducing member 9, and a reduced diameter portion 41 is formed there. Before the ink occlusion body 4 is pressed into the reduced-diameter member 9, the ink occlusion body 4 has a right cylindrical shape and has a uniform capillary gap (that is, a uniform capillary force). for that reason,
The reduced diameter portion 41 at the rear end of the ink occluding member 4 has a stronger capillary force than other portions of the ink occluding member 4 due to compression deformation.

(Ink guiding member) The ink absorbing member 4
A rod-shaped ink guide member 6 made of a resin processed body of a synthetic resin fiber (for example, polyester fiber, acrylic fiber or the like) is attached to the axis of the shaft so as to penetrate the inside of the ink storage body 4 in the axial direction. The outer peripheral wall of the guide member 6 is in direct contact with the inner surface of the ink storage body 4. In particular, the outer surface of the ink guide member 6 is formed by a reduced diameter portion 41 formed by compressive deformation of the rear end portion of the ink occluding body 4 from radially outward to inward.
It is strongly in close contact with the inner surface of the rear end of the ink occluding body 4 in the radial direction. This not only stabilizes the ink connection between the ink storage body 4 and the ink guide member 6, but also stabilizes the ink guide member 6.
Of the shaft cylinder 7 from the front can be prevented.

The rear end of the ink guide member 6 passes through the inside of the ink storage body 4 and the center hole 52 of the partition wall 5 and is exposed to the ink tank 3 side. The front end of the ink guide member 6 is appropriately shaped and protrudes outward as a pen tip 2.

The axis of the ink guide member 6 is
Ink lead-out passage 6 consisting of an axially extending hole with an inner diameter of 1 mm
1 is formed. The ink outlet path 61 has a rear end opening toward the ink tank 3 and a front end provided at a position having a thickness T of 5 mm from the front end of the pen tip 2. Further, the capillary force of the ink outlet path 61 is set smaller than the capillary force of the outer peripheral wall of the ink guide member 6.

(Reduced Diameter Member) The reduced diameter member 9 is an integrally molded synthetic resin body having a cylindrical front portion 91 and a cylindrical rear portion 92. The outer surface of the cylindrical front part 91 is the holding cylinder 8.
The tapered inner surface has a tapered inner surface gradually reduced in diameter from the front end to the rear and a straight inner surface further reduced in diameter from the rear end of the tapered inner surface. The outer surface of the ink occluding body 4 is compressed into a tapered shape by the tapered inner surface, and the reduced diameter portion 41 is formed at the rear end of the ink occluding body 4 by the straight inner surface. Thereby,
The capillary force of the ink occluding body 4 can be set to be continuously higher as going from the front end to the reduced diameter portion at the rear end.

On the other hand, the cylindrical rear portion 92 of the diameter reducing member 9
Protrudes into the ink tank 3 in a cylindrical shape with a bottom, and surrounds the rear end of the ink guide member 6 and the vicinity of the rear end. Between the bottom surface of the cylindrical rear portion 92 and the rear end surface of the ink guide member 6, and between the inner peripheral surface of the cylindrical rear portion 92 and the ink guide member 6;
A slight gap is provided between the outer peripheral surface and the vicinity of the rear end so as to form a liquid storage portion 92a. In particular, the liquid storage 9
The gap forming 2a is set smaller in the vicinity of the opening of the ink lead-out passage 61 than in other portions in order to further increase the capillary force and enhance the liquid sealing property. As a result, when the amount of ink in the ink tank 3 becomes low, the ink is temporarily held between the liquid storage portions 92a, and even if the writing implement is used in a horizontal state or a pen point-up state, the ink ejection property is reduced. Can be prevented.

A plurality of ink guide ribs 92b are formed integrally on the inner surface of the cylindrical rear portion 92 and extend radially from the axis and extend in the axial direction. The ink guide rib 92b allows the ink to be quickly guided from the ink tank 3 to the liquid storage portion 92a.

A step is provided on the ink guide rib 92b near the bottom surface of the cylindrical rear portion 92, and the rear end face of the ink guide member 6 is maintained in the open state of the ink outlet hole 61 while the shaft is maintained. It supports in the direction. A slight gap having a capillary force is provided between the bottom surface of the cylindrical rear portion 92 and the rear end surface of the ink guide member 6, so that the rear end opening of the ink outlet hole 61 can be effectively sealed with a liquid. can do.

An opening 92c communicating between the ink guide ribs 92b is provided on the side wall of the cylindrical rear portion 92. Thereby, the ink tank 3 and the space between the ink guide ribs 92b are communicated with each other.
The ink tank 3 and the rear end of the ink guide member 6 communicate with each other, and the ink tank 3 and the rear surface of the partition wall 5 communicate with each other via the space between the ink tanks 3b.

Since the ink guide ribs 92b are radial, the gap between the ink guide ribs 92b is set to be smaller from the outside in the radial direction toward the ink guide member 6 at the axis. As a result, the capillary force is set to be stronger toward the ink guide member 6 at the axis. As a result, the function of promptly guiding ink from the ink tank 3 to the ink guiding member 6 can be further enhanced.

A flange 93 is continuously provided between the cylindrical front part 91 and the cylindrical rear part 92, and the flange 93 is provided between the rear end of the holding cylinder 8 and the step 71 on the inner surface of the shaft cylinder 7. Thus, it is pinched and fixed in the axial direction.

(Partition) The partition 5 is an integrally formed synthetic resin (non-porous body) composed of a disk-shaped flange and a tubular portion provided continuously behind the flange, and has the reduced diameter. It is press-fitted and fixed in the member 9. As shown in FIGS. 1 and 4, a plurality of (in this case, eight) axial grooves are provided on the inner surface of the diameter-reducing member 9. When the flange of the partition 5 is press-fitted, a slit-shaped communication hole 51 is formed between the outer surface of the flange of the partition 5 and the inner surface of the reduced-diameter member 9. The communication hole 51 is an arc-shaped or rectangular slit extending in the circumferential direction having a uniform groove width and having a uniform cross-sectional width, and the gap dimension (that is, the groove width S in the radial direction) is 0.1 mm.
It is set to 04 mm to 0.07 mm. By forming the communication hole 51 between the outer surface of the flange portion of the partition wall 5 and the inner surface of the reduced-diameter member 9, even if the groove width S of the communication hole 51 is relatively small, the groove width S can be reduced. It can be set reliably and easily.

Further, a center hole 52 is provided through the axis of the cylindrical portion of the partition wall 5, and an ink guide member 6 is inserted therethrough. Further, the front surface of the partition wall 5 is in contact with the rear end portion (the reduced diameter portion 41) of the ink occluding body 4.

<Second Embodiment> FIG. 6 shows a direct liquid writing instrument 1 according to a second embodiment of the present invention. This is a modified example of the ink guide member 6 of the first embodiment, in which the front end of the tubular ink guide member 6 made of a porous material (for example, a resin processed body of fiber) having a through hole with an inner diameter of 1 mm in the shaft center. The plug 21 is formed by inserting and fixing a plug 21 (specifically, a pin made of a synthetic resin) as a separate member at the front end of the through hole, and forming it into a pen point shape by grinding or the like. The other configuration is the same as that of the first embodiment.

<Third Embodiment> FIG. 7 shows a direct liquid writing instrument 1 according to a third embodiment of the present invention. This is a modified example of the ink guide member 6 of the first embodiment, and is a front end of a tubular ink guide member 6 made of a porous material (for example, a resin processed body of fiber) having a through hole with an inner diameter of 1 mm in the axis. The pen tip 2 made of a porous material (for example, a continuous porous body made of synthetic resin) is fixed to the outer surface. The other configuration is the same as that of the first embodiment.

<Fourth Embodiment> FIG. 8 shows a direct liquid writing implement 1 according to a fourth embodiment of the present invention. This is a modification of the ink guide member 6 of the first embodiment. The configuration of the ink guide path 61 in the ink guide member 6 is such that a hole provided at the axis of the ink guide member 6 is made of a porous material. This is a configuration in which a rod-shaped member is mounted. The rod-shaped member is a separate member (for example, a member having a smaller capillary force than the capillary force of the outer peripheral wall of the ink guide member 6).
(Resin processed body of fiber). The other configuration is the same as that of the first embodiment.

[0067]

According to the first aspect of the present invention, since the ink is drawn out from the ink tank to the pen tip quickly and abundantly by the ink lead-out path inside the ink guide member, the pen tip can be penetrated. An appropriate amount of ink is continuously ejected from the ink, so that thin handwriting and handwriting are not generated. Therefore, the ink retaining function of the ink occluding body is not reduced, and the sufficient ability to suppress the ink leakage from the pen tip side can be maintained, and at the same time, the sufficient ink discharging property from the pen tip can be obtained.

According to the second aspect of the present invention, the direct liquid type writing instrument of the present invention can obtain more satisfactory ink ejection properties and ink leakage prevention properties.

According to the third aspect of the invention, the direct liquid writing implement of the present invention can maintain a stable ink discharge property even when the pen tip is not in the downward state.

According to the fourth aspect of the present invention, the direct liquid writing instrument of the present invention avoids an excessive outflow of ink from the pen tip, and at the same time, avoids an insufficient amount of ink ejection and satisfies a proper ink ejection property from the pen tip. .

According to the direct liquid writing implement of the present invention, it is possible to suppress the ink from remaining in the ink occluding body by the constitution of claim 5, and as a result, to further suppress the occurrence of the ink leakage accident due to the increase of the residual ink. .

According to the direct liquid type writing instrument of the present invention, the ink jetting property from the pen tip and the ink leak preventing property can be simultaneously obtained.

[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 sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view taken along line BB of FIG. 1;

FIG. 4 is an enlarged sectional view taken along line CC of FIG. 1;

FIG. 5 is an enlarged sectional view taken along line DD of FIG. 1;

FIG. 6 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing a third embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Direct liquid writing implement 2 Pen tip 21 Plug 3 Ink tank 4 Ink occlusion body 41 Reduced diameter part 5 Partition wall 51 Communication hole 52 Center hole 6 Ink guide member 61 Ink lead-out path 7 Shaft cylinder 71 Stepped part 8 Holding cylinder 81 81a Support rib 82 Cylindrical part 83 Flange 9 Reduced diameter member 91 Front part 92 Rear part 92a Liquid storage part 92b Ink guide rib 92c Opening 93 Flange part S Groove size of communication hole T Fillet between ink leading path front end and pen tip front end Thickness dimensions

Claims (6)

    [Claims]
  1. An ink occluding body (4) made of a porous material is provided between a pen tip (2) and an ink tank (3), and the ink occluding body (4) and the ink tank (3) are connected to each other. An ink guide member made of a rod-shaped porous material for supplying ink from the ink tank (3) to the pen tip (2) on the ink storage body (4) and the partition (5) by providing a partition (5) between them. (6) a direct liquid writing tool in which the inner surface of the ink storage body (4) and the outer surface of the ink guide member (6) are in close contact with each other; A direct liquid writing implement, wherein a front end is located near a front end of a pen tip (2), and an ink lead-out path (61) having a rear end opened to an ink tank (3) is provided.
  2. 2. The capillary force of the outer peripheral wall of the ink guide member (6) is set to be larger than the capillary force of the ink occluding body (4) and the capillary force of the ink outlet path (61). Direct writing instrument.
  3. 3. The ink reservoir according to claim 1, wherein a liquid reservoir (92a) is provided at a rear end of said ink guide member (6) for liquid sealing an opening at a rear end of said ink outlet path (61). Liquid writing implement.
  4. 4. A pen point (2) made of a porous material is provided at a front end of said ink guide member (6), and a thickness dimension of a front end of said ink lead-out path (61) and a front end of said pen point (2). 4. The method according to claim 1, wherein T) is 1 mm to 20 mm.
    A direct liquid writing instrument as described.
  5. 5. A reduced diameter portion (41) for enhancing a capillary force at a rear end of the ink occluding body (4).
    3. The direct liquid writing implement according to 3 or 4.
  6. 6. The partition wall (5) is connected to an ink tank (3) by a rear end portion of the ink storage body (4).
    The direct liquid writing instrument according to claim 1, wherein a slit-shaped communication hole (51) having a groove width (S) of 0.2 mm to 0.25 mm is provided.
JP10219810A 1998-07-17 1998-07-17 Direct liquid type writing instrument Pending JP2000033795A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10219810A JP2000033795A (en) 1998-07-17 1998-07-17 Direct liquid type writing instrument

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP10219810A JP2000033795A (en) 1998-07-17 1998-07-17 Direct liquid type writing instrument
CA 2246422 CA2246422A1 (en) 1997-08-29 1998-08-27 Direct liquid supply writing implement
EP19980116356 EP0899128B1 (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
US09/141,560 US5967687A (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
KR1019980035065A KR19990023957A (en) 1997-08-29 1998-08-28 Direct writing instruments
TW87114263A TW409101B (en) 1997-08-29 1998-08-28 Direct liquid supply writing implement

Publications (1)

Publication Number Publication Date
JP2000033795A true JP2000033795A (en) 2000-02-02

Family

ID=16741398

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10219810A Pending JP2000033795A (en) 1998-07-17 1998-07-17 Direct liquid type writing instrument

Country Status (1)

Country Link
JP (1) JP2000033795A (en)

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