JPH10166781A - Writing instrument - Google Patents

Writing instrument

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Publication number
JPH10166781A
JPH10166781A JP8335730A JP33573096A JPH10166781A JP H10166781 A JPH10166781 A JP H10166781A JP 8335730 A JP8335730 A JP 8335730A JP 33573096 A JP33573096 A JP 33573096A JP H10166781 A JPH10166781 A JP H10166781A
Authority
JP
Japan
Prior art keywords
ink
core
ink guide
hole
writing
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
JP8335730A
Other languages
Japanese (ja)
Inventor
Shinichi Ishikawa
Akio Kokubu
昭雄 国分
真一 石川
Original Assignee
Zebra Pen Corp
ゼブラ株式会社
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 Zebra Pen Corp, ゼブラ株式会社 filed Critical Zebra Pen Corp
Priority to JP8335730A priority Critical patent/JPH10166781A/en
Publication of JPH10166781A publication Critical patent/JPH10166781A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Summary] (with correction) [PROBLEMS] To prevent the ink in the ink guide hole communicating between the ink guide core and the rotating body of the writing unit from dropping back to the ink guide core due to a back shock such as an impact. Deter. SOLUTION: In a writing instrument for supplying ink M from an ink tank 1 to a rotating body 7 of a writing section 5 using a capillary force, the writing section 5 communicates with the rotating body 7 from a front end face of an ink guide core 4. It has an ink guide hole 6, the capillary force acting on the ink guide hole 6 is stronger than the capillary force of the ink guide core 4 made of a fiber bundle, and the fibers at the front end side portion of the ink guide core 4 are formed on the entire circumferential surface. By communicating with the ink guide hole 6 in a compressed state, the dropping phenomenon of the ink M in the ink guide hole 6 due to a back shock such as an impact due to the presence of the fiber compression portion 13 is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument of a direct liquid type in which ink is directly filled in an ink tank, or an ink penetrating type in which a so-called ink occluding body in which ink is permeated into a batting or the like is loaded in the ink tank. More particularly, the present invention relates to a writing implement having an ink guiding structure for feeding and supplying ink in an ink tank to a rotating body at the tip of a writing section by a capillary force (ink suction force).

[0002]

2. Description of the Related Art As a writing instrument of this type which has been conventionally known, a rotary member holds an ink guide core formed of a fiber bundle in which fibers having a rear end side in an ink tank are bundled in a rod shape. The ink is sent to the rotating body by capillary force (ink suction force) acting on the ink guide core, and is supplied to the rotating body. Further, an ink passage is provided in the ink tank from the front end of the ink guide core having the rear end side to the front end of the writing portion further holding the rotating body, so that both the ink guide core and the ink passage are provided. The ink is sent to the rotating body by the capillary force acting on the rotating body, and the ink is supplied to the rotating body (for example, Japanese Utility Model Application Laid-Open No. 64-25180,
No. 57-169579).

[0003]

By the way, a so-called metal tip of a writing portion, which is mainly made of a metal material and has a ink guiding hole and has a rotating body inside the tip, is so thin. Therefore, the above-mentioned Japanese Utility Model Application No. 64-25180 and Japanese Utility Model Application
No. 169579, etc., an ink guide core inserted into the tip of the chip holding the rotating body and inserted into the tip, or an ink path inserted into the chip to secure an ink path between the tip and the inner surface of the chip. Since the components must be formed with a thickness approximately the same as the inner diameter of the chip, or even thinner, the processing is troublesome, and at the same time, the incorporation into the chip is also very troublesome and time-consuming. However, the production cost has risen due to problems such as poor production yield. In addition, the stability of quality cannot be expected, for example, there is a possibility that the ink supply to the rotating body may be interrupted during writing.

[0004] In view of such circumstances, the present applicant has taken all troublesome and troublesome processing and assembling work on a writing implement for supplying ink from a ink tank to a rotating body of a writing section using capillary force. A writing implement having an ink guiding structure improved so as to be able to always supply a constant amount (suitable amount) of ink to the rotating body without being eliminated has been proposed. Such a writing instrument is a thin tube which sends out ink sent from an ink tank by a capillary force acting on an ink guide core made of a fiber bundle to a rotating body at the tip of a writing section by a capillary force stronger than the capillary force of the ink guide core. The ink guide hole consisting of a hole and the like has an ink guide structure provided between the ink guide core and the rotating body, eliminating the need for cumbersome and troublesome processing and assembly work as in the past. In addition, the ink can be reliably supplied from the ink guide core to the rotating body at the tip of the writing section. However, during writing, the writing implement is accidentally dropped onto the floor or the like by an ink guide hole which serves to send ink from the ink guide core to the rotating body at the tip of the writing unit by a capillary force stronger than the capillary force of the ink guide core. The ink drops back to the ink guide core due to the back shock such as the impact at the time of the ink drop, and the ink drop phenomenon occurs, and it is understood that the ink writing does not come out easily at the time of rewriting (ink scuffing) Was.

According to the present invention, there is provided a writing instrument for supplying ink from an ink tank to a rotary body of a writing section by utilizing a capillary force, which eliminates any troublesome and troublesome processing and assembling work, and always provides a fixed amount (suitable amount). Ink can be reliably supplied to the rotating body, and of course, the ink in the ink guiding hole that connects the ink guiding core and the rotating body of the writing unit returns to the ink guiding core due to a back shock such as an impact. It is an object of the present invention to provide a writing instrument having an ink guiding structure further improved so as to prevent the writing.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an ink tank having a writing portion holding a rotating body at a tip thereof, which is inserted into a core loading hole of the ink tank and inserted through an ink guide core. In the writing implement having an ink guiding structure in which the ink is supplied to the writing section by the capillary force of the ink guiding core, the writing section is rotated from the front end to the front end of the ink guiding core made of a fiber bundle. An ink guide hole for communicating with the body and sending out the ink to the rotating body by a capillary force stronger than the ink guide core, and the fibers on the end face side portion of the ink guide core to be communicated with the ink guide core are formed on the entire circumferential surface or That is, compression was performed from a required range in the circumferential direction or several places in the circumferential direction. That is, the fibers at the front end portion of the ink guide core are communicated with the ink guide holes in a state where the fibers are compressed from a required range in the circumferential direction, from several places in the circumferential direction, or from the entire circumferential surface. It is preferable that the fiber compression portion of the ink guide core is formed by compressing the fiber of the end face side portion from the entire circumferential surface. In other words, when the fibers on the end face side are uniformly compressed from the entire peripheral surface, the ink drop phenomenon due to back shock such as impact can be more effectively suppressed.
When the porosity of the ink guiding core is 45 to 75%, the diameter of the ink guiding hole is set to 0.1 to 0.3, and a capillary force stronger than the capillary force acting on the ink guiding core is applied to the ink guiding hole. That is to work. According to such a technical means, the ink sent from the ink tank by the capillary force acting on the ink guide core formed of the fiber bundle is supplied to the ink guide hole which communicates the ink guide core with the rotating body at the tip of the writing portion. Is guided and supplied to the rotating body by the capillary force acting on the rotating body. In other words, the ink guiding structure for sending ink from the ink guiding core to the rotating body by capillary force has holes,
That is, it is an ink guide hole, and ink can be supplied to the rotating body from the ink guide core by the capillary force acting on the ink guide hole. Since the fibers at the end face side portion of the ink guide core communicating with the ink guide hole are compressed, the ink in the ink guide hole returns to the ink guide core side due to a back shock such as an impact due to the presence of the fiber compression portion. The ink drop phenomenon is suppressed. In other words, the drop of ink in the ink guide hole is suppressed by the fiber compression section in which the fiber is compressed and the gap between the fibers is narrowed.

The fiber compression portion of the ink guide core is coaxial with a front compression portion inserted into the ink guide hole and between the ink guide hole and the ink guide core with a hole diameter larger than the ink guide hole. And a rear compression portion that is inserted into an ink circulation hole that communicates with the ink guide hole and the ink guide core. According to such technical means, the drop phenomenon of the ink in the ink guide hole due to the back shock such as the above-mentioned shock is reliably and effectively suppressed by the presence of the two front and rear compression parts.

A fiber compression section is formed at the front end portion of the ink guide core during the process of inserting and inserting the ink guide core into the core loading hole and communicating with the ink guide hole. That is, a regulating portion for regulating the amount of insertion into the hole is provided. According to such a technical means, the compressed state of the fiber at the front end side portion of the ink guide core communicated with the ink guide hole is kept constant by the regulating portion. In other words, there is no variation in the compressed form of the fibers in the fiber compressing section, which functions to suppress the ink drop phenomenon in which the ink in the ink guide holes returns to the ink guide core side, and the ink guides of all mass-produced writing instruments do not vary. It is possible to form a fiber compression section compressed in a constant and uniform compression form that can surely suppress the ink drop phenomenon on the core.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an ink reservoir 8 provided at the front end opening of an ink tank 1. The ink reservoir 8 is inserted and inserted from a core loading hole 2 penetrating before and after the ink reservoir 8 to a core loading hole 3 of a tip port holder 9 described later. 1 shows an example of a direct liquid type writing instrument having a writing portion 5 provided in an ink tank 1 via an ink guiding core 4 which is sent out of the ink tank 1 by a capillary force acting on the ink guiding core 4 made of a fiber bundle. The supplied ink is sent out and supplied to a rotating body 7 held at the tip of the writing portion 5 by a capillary force acting on the ink guiding hole 6 of the writing portion 5 communicating with the front end side of the ink guiding core 4. To be done.

The ink tank 1 is an integrally molded product made of an injection-molded material such as a synthetic resin. The writing section 5 is connected and provided.

The front end holder 9 is an integrally molded product made of an injection molding material such as a synthetic resin, like the ink tank 1, and is connected to the front end of the ink storage body 8 in a liquid-tight manner by press-fitting. Is formed in a tapered shape with a step gradually toward the front side provided with a coaxially protruding connection, and the writing part 5 is connected to the front side in a liquid-tight manner by press-fitting.
And a core loading hole 3 whose hole diameter is substantially the same as the diameter of the core loading hole 2 of the ink storage body 8 is coaxially opened. An ink circulation hole 11 is provided between the core loading hole 3 and the connection portion 10 and is smaller than the diameter of the core loading hole 3 and larger than the diameter of the ink guide hole 6 of the writing part 5. The core loading hole 3 of the front-end holder 9 is formed such that the front end side portion coaxially communicating with the ink circulation hole 11 has a tapered shape in which the hole diameter is gradually reduced toward the ink circulation hole 11 side. The ink flow hole 11 communicates with the ink through the tapered portion 3-1.

As is well known, the ink guide core 4 is formed of a fiber bundle in which fibers are bundled in a rod shape, and a leading end holder 9 which is coaxially communicated from the core loading hole 2 of the ink reservoir 8 to the core loading hole 2. The writing portion 5 is formed in such a length as to communicate with the ink guiding hole 6 over the ink guiding hole 6 of the writing portion 5 which is connected and provided in a liquid-tight manner through the core loading hole 3 and communicates with the ink guiding hole 6. The front end portion is formed into a tapered shape at the taper angle of the above-described tapered portion 3-1 of the core loading hole 3, and the conical tapered portion connects the front end portion to the ink guide hole 6.
4-1 (see Fig. 2). Also, this ink guide core 4
The ink guide core 4 is inserted into the rear end of the ink reservoir 8 so as to communicate with the ink guide hole 6 of the writing unit 5 from the core loading hole 2 and is formed into an annular shape to regulate the insertion amount when the ink guide core 4 is inserted. The regulating portion 12 is provided to prevent the ink in the ink guiding hole 6 from dropping back to the ink guiding core 4 due to a back shock such as an impact which is the gist of the present invention. A fiber compression portion 13 in which fibers are compressed from the entire circumference in a uniform and uniform compression state is formed on the tapered portion 4-1 of the ink guide cores 4 of all the writing instruments mass-produced without variation in the compression state. To be done.

The writing section 5 is made of a metal or the like having a ball house 17 at the front end formed by a seat section 15 having an ink guide groove 14 in the axial direction and an inward front end edge 16 processed to be narrowed inward. , The rotor 7 is rotatably held in the ball house 17, and the front end of the ink guide core 4 is cut from the seat 15 of the ball house 17.
4-1 is provided with an ink guide hole 6 communicating with the ink guide hole 4 and the ink sent out from the ink tank 1 by the capillary force acting on the ink guide core 4 by the capillary force acting on the ink guide hole 6. It is formed so as to be supplied to. The ball of the rotating body 7 held by the ball house 17 of the writing section 5 has a diameter of φ0.3.

When the ink guide core 4 having a porosity of 45 to 75% is used in the present embodiment, the diameter of the ink guide hole 6 is set to 0.1 to 0.3, and particularly, the porosity of the ink guide core 4 is reduced. 60
In the case of%, by setting the diameter of the ink guide hole 6 in the range of φ0.15 to 0.3, the ink M can be sent out and supplied to the rotating body 7 with a capillary force stronger than the capillary force of the ink guide core 4. It is formed as follows. However, the diameter of the ink guide hole 6 is replaced with a gap between the two glass plates 18, and the strength of the capillary force (ink suction force) acting on the gap is determined by the moving distance of the ink M over a certain period of time. as it is apparent from the experimental examples shown in FIG. 3 showing, towards the L 1 portion corresponding to the hole diameter φ0.15 than L 2 portion corresponding to a pore diameter φ0.3 is,
The moving distance of the ink M is large. In other words, towards the L 1 region as compared to the L 2 site, strong capillary force, it can be seen faster movement of the ink M. Therefore, in this embodiment, the porosity is 60%.
When the ink guide core 4 is used, the ink guide core 4
The diameter of the ink guide hole 6 is set to a range of φ0.15 to 0.3 so that a capillary force stronger than the capillary force acts on the ink guide hole 6, and the ink M flows from the ink guide core 4 to the rotating body 7 with a strong capillary force. It is formed so as to be sent out quickly.

The gap between the two glass plates 18 is gradually increased from the left end to the right as shown in FIG.
(A) and (B) L from the left end to the right
In gap 1 site corresponds to a pore size Fai0.15, a gap L 2 portion corresponds to a pore size Fai0.3. In FIG. 3A, the portion where the ink has moved (the portion where the ink has risen due to the capillary force) is shown by oblique lines at the upper right, and the straight line rising vertically from each of the portions L 1 and L 2 and the moving portion are shown. The intersections X 1 and X 2 with the curve are the distances of movement of the ink over a certain time,
That is, it indicates the strength of the capillary force.

Thus, according to the present invention, when the writing section 5 and the ink guide core 4 configured as described above are incorporated into the ink reservoir 8 which is fixedly incorporated into the tip end opening of the ink tank 1,
In particular, the leading port holder 9 communicates with the ink guide hole 6 of the writing section 5 connected to the ink reservoir 8 from the core loading hole 2 of the ink reservoir 8 through the core loading hole 3 of the leading port holder 9. When the ink guide core 4 is inserted into the ink guide core 4 (state shown in FIG. 2), the tapered peripheral surface of the tapered portion 4-1 of the ink guide core 4 comes into contact with the opening edge (corner) of the ink circulation hole 11. After the ink guide core 4 is inserted into the ink guide hole 4 until the regulating portion 12 at the rear end of the ink guide core 4 comes into contact with the ink storage portion 8, the fiber of the tapered portion 4-1 is opened. Thus, the ink is compressed from the entire peripheral surface, and communicates with the ink guide hole 6 via the ink circulation hole 11 in the compressed state. Thus, a fiber compression portion 13 compressed from the entire peripheral surface is formed in a part of the tapered portion 4-1 of the ink guide core 4 (the state of the enlarged view of FIG. 1).

The fiber compressing section 13 suppresses a drop phenomenon of the ink M that returns from the ink guide hole 6 to the ink guide core 4 due to a back shock such as a shock when the writing implement is dropped on the floor or the like by mistake. The ink guide core 4 is inserted and inserted into the ink guide hole 6 of the writing part 5 from the core loading hole 2 of the ink storage body 8 through the ink circulation hole 11 as described above. In the process, the fibers of the tapered portion 4-1 of the ink guide core 4 are compressed from the entire peripheral surface to form the tapered portion 4-1 or the fibers of the tapered portion 4-1 of the ink guide core 4 are assembled before being incorporated. It is formed by compressing from the entire peripheral surface to the tapered portion 4-1 in advance.

In order to form the above-mentioned fiber compression section 13, the fiber is compressed from its peripheral surface.
As long as the drop phenomenon of the ink M in the inside can be surely suppressed, it is not limited to the compression from the entire circumferential surface described above, but may be, for example, three to five places at equal intervals in the circumferential direction. 200 from several directions or 360 °
The compression form is arbitrary, as described above, as being formed in the circumferential direction within the range of {320}.

According to the writing implement of this embodiment configured as described above, the ink tank 1 is formed by the capillary force of the ink guide core 4.
The ink M sent out from the ink guiding hole 6 to the front end face of the tapered portion 4-1 of the ink guiding core 4 communicates with the ink guiding hole 6 through the ink guiding hole 6 having a stronger capillary force than the ink guiding core 4. It is sent out to the house 17 and supplied to the rotating body 7 of the ball house 17. Since the ink guiding structure for sending out the ink M from the ink guiding core 4 to the ball house 17 by capillary force is the ink guiding hole 6 from the front end face of the ink guiding core 4 to the ball house 17, that is, the hole is conventionally used. The ink M sent from the ink tank 1 by the capillary action of the ink guide core 4 is quickly sent to the rotating body 7 of the ball house 17 without any troublesome and troublesome processing or assembly like the writing implement of And it can be supplied quantitatively. Even if the ink M in the ink guide hole 6 receives a back shock such as a shock when the writing implement is accidentally dropped on the floor or the like, the ink guide core 4 returns to the ink guide core 4 communicating therewith. 4 is suppressed by the presence of the fiber compression portion 13 provided at the front end taper 4-1. As a result, there is no occurrence of non-writing (ink scuffing) indicating that ink does not readily come out during rewriting. Thereby, stability of quality and improvement of reliability can be achieved.

Incidentally, the ink reservoir 8 having the core loading hole 2 for supporting the ink guiding core 4 in a penetrating manner communicates with the outside of the core loading hole 2 extending from the front end side to the rear end side in a ring shape in the circumferential direction. And a comb-shaped ink storage groove 8-1 which is separated and separated at an appropriate interval in the axial direction, and each ink storage groove 8-1 extends from the rear end side to the vicinity of the front end side. The groove width communicating with each ink storage groove 8-1 on the opposite side of the ink groove 8-2 in the range from the front end side to the vicinity of the rear end side is wide, with the narrow groove width communicating with the ink groove 8-2. When the internal pressure of the ink tank 1 rises more than necessary, the ink M is stored in the ink storage grooves 8-1 from the ink grooves 8-2. When the amount of the ink M is reduced, the ink tank from the air exchange groove 8-3 passes through each ink storage groove 8-1. Air is fed into the ink tank 1 so that the internal pressure of the ink tank 1 is maintained.

FIG. 4 shows another embodiment in which the form of forming the fiber compression portion 13 of the above-described ink guide core 4 is changed. In this embodiment, the fiber compression portion 13 is formed in a state of being inserted into the ink guide hole 6. Front fiber compression section 13-1 and a rear fiber compression section 13- formed while being inserted into the ink circulation hole 11 between the ink guide hole 6 and the core loading hole 2 (ink guide core 4). 2 is provided in the tapered portion 4-1 of the ink guide core 4, and the fiber compression portions 13-1 and 13-2 before and after the ink guide core 4 suppress the drop phenomenon of the ink M in the ink guide hole 6 due to a back shock such as an impact. Is formed. Such an embodiment is a fiber compression unit 13
Since the structure is basically the same as that of the above-described embodiment except for changing the front and rear fiber compression portions 13-1 and 13-2, the same reference numerals are used for the same components, and the description thereof will be omitted. Is omitted.

The front-side fiber compression section 13-1 is formed by forming the tapered portion 4-1 of the ink guide core 4 into a tapered shape having a longer taper angle than that described in the above-mentioned embodiment and a further increased taper angle. In the process of inserting and inserting the guide wick 4 from the core loading hole 2 of the ink reservoir 8 so as to communicate with the ink guide hole 6 of the writing section 5 as described above, the ink guide hole 6 of the writing section 5 is inserted.
The tapered peripheral surface of the tapered portion 4-1 abuts on the opening edge (corner) of the hole, and the regulating portion 12 at the rear end of the ink guide core 4 is
When the ink guide core 4 is further pushed and inserted until it comes into contact with the rear end face, the fiber of the tapered portion 4-1 is compressed from the entire peripheral surface by the opening edge of the ink guide hole 6, and the compression is performed. In this state, it is inserted (communicated) into the ink guide hole 6.

The rear fiber compression section 13-2 is inserted until the tapered peripheral surface of the tapered portion 4-1 of the ink guide core 4 contacts the opening edge (corner) of the ink flow hole 11, By further pushing and inserting the regulating portion 12 at the rear end of the ink guide core 4 until it comes into contact with the rear end surface of the ink reservoir 8, the tapered portion 4-1 is formed.
These fibers are compressed from the entire peripheral surface by the edge of the opening of the ink flow hole 11 and inserted into the ink flow hole 11 behind the ink guide hole 6 in the compressed state.

In the compressed form of the fiber compressing sections 13-1 and 13-2 before and after this, as in the case of the above-described detailed description of the embodiment, when a back shock such as an impact is received, the ink M in the ink guide hole 6 is discharged. If the drop phenomenon can be surely suppressed, from several places in the circumferential direction, for example, three to five places at equal intervals in the circumferential direction, or from 200 ゜ to the entire circumference of 360 ゜The compression form is arbitrary, as described above as being formed at one place in the circumferential direction within a range of 320 °.

According to the writing implement described in detail in this embodiment, the drop phenomenon of the ink M in the ink guide hole 6 due to the back shock such as the impact is caused by the two fiber compression portions 13-.
It is surely and more effectively suppressed by the presence of 1, 13-2. As a result, there is no occurrence of non-writing (ink scuffing) indicating that ink does not easily come out during rewriting, and an effect that can further improve the stability of quality and reliability can be expected. .

FIG. 5 shows another embodiment in which the configuration of the ink guide core 4 and the form of communication between the core loading hole 3 of the front-end holder 9 and the ink guide hole 6 of the writing unit 5 are changed. In the example, the tapered portion formed at the front end side portion of the core loading hole 3 at the time of assembling and inserting the ink guide core 4 without providing the tapered portion 4-1 on the front end side of the ink guide core 4 as described in detail in the above embodiment.
The front end portion of the ink guide core 4 is compressed by utilizing 3-1 so that the fiber compression portion 13-3 is formed in the front end portion. This embodiment is the same as the above-described embodiment except that the configuration of the ink guide core 4 and the configuration of communication between the core loading hole 3 of the front-end holder 9 and the ink guide hole 6 of the writing unit 5 are changed. Since the components are basically the same, the same components are denoted by the same reference numerals and the description thereof will be omitted.

Thus, in this embodiment, the hole shape of the front end side portion of the core loading hole 3 of the front-end holder 9 is directly inserted into the ink guide hole 6 toward the ink guide hole 6 of the writing section 5. It is formed in a tapered shape in which the hole diameter is gradually reduced so as to communicate with each other.
By inserting and inserting the ink guiding core 4 so as to communicate with the ink guiding hole 6 of the writing unit 5 toward the core loading hole 3 of
The fiber at the front end side of the ink guide core 4 (see the two-dot chain line in FIG. 5), which has a bar shape as a whole, is compressed from the entire circumference while being guided by the tapered portion 3-1. It is formed so as to be communicated with the ink guide hole 6 in a state where the front end face thereof approaching the ink guide hole 6 is gradually compressed to a greater extent. In this embodiment, the taper angle of the tapered portion 3-1 is reduced, and the formation range of the core loading hole 3 in the axial direction is increased, so that the ink compressed to form the fiber compression portion 13-3 is formed. Induction core 4
It is preferable that the fiber at the front end side is compressed not abruptly but gently. With such a configuration, as described in detail in the above-described embodiment, it is possible to save the processing labor of forming the tapered portion 4-1 on the front end side portion of the ink guide core 4, so that Minutes,
An improvement in productivity can be expected.

[0028]

Since the writing instrument of the present invention is constituted as described above, the following effects are obtained. . According to the first aspect, the ink sent from the ink tank by the capillary force of the ink guide core formed of the fiber bundle acts on the ink guide hole communicating with the ink guide core and the rotating body at the tip of the writing portion. It is sent out and supplied to the rotating body by force. In other words, the ink guiding structure for sending ink from the ink guiding core to the rotating body by capillary force is a hole, that is, an ink guiding hole, and ink is supplied from the ink guiding core to the rotating body by the capillary force acting on the ink guiding hole. can do. Since the fibers at the front end side of the ink guide core communicating with the ink guide hole are compressed, the ink in the ink guide hole returns to the ink guide core side due to a back shock such as an impact due to the presence of the fiber compression portion. The ink drop phenomenon is suppressed. In other words, the drop of ink in the ink guide hole can be suppressed by the fiber compression section in which the fiber is compressed and the gap between the fibers is narrowed.

[0029] According to the second aspect, the ink drop phenomenon in the ink guide hole due to the back shock such as the impact can be reliably and more effectively suppressed by the presence of the two front and rear fiber compression portions.

[0030] According to the third aspect, in the ink guide hole,
The compression state of the fibers at the front end side portion of the ink guide core, which communicates the fibers in a compressed state, is kept constant by the restricting portion. In other words, there is no variation in the compression form of the fibers in the fiber compression section, which functions to suppress the ink drop phenomenon in which the ink in the ink guide holes returns to the ink guide core side,
In order to surely suppress the ink drop phenomenon with respect to the ink guide cores of all writing tools, it is possible to form a fiber compression portion which is compressed in a uniform and uniform compression form.

Therefore, according to the present invention, in a writing instrument for supplying ink from the ink tank to the rotating body of the writing section by using a capillary force, there is no troublesome and troublesome processing or assembling work like a conventional writing instrument. Not only is it possible to reliably supply a fixed amount of ink from the ink guide core to the rotating body without necessity, but also the ink in the ink guide hole is caused by a back shock such as an impact when the writing implement is accidentally dropped on the floor or the like. Since the ink drop phenomenon that returns to the ink guiding core side can be suppressed, there is no possibility that the non-writing (ink scuffing) that the ink does not easily come out during rewriting will occur. Therefore, it is possible to provide a writing implement having an ink guiding structure for improving quality stability and reliability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a direct liquid type writing instrument of the present invention, in which a part of an ink tank is omitted.

FIG. 2 is an enlarged longitudinal sectional view of a main part showing a process of inserting and inserting an ink guide core from a core loading hole of an ink tank into an ink guide hole of a writing part.

FIG. 3 shows an experimental example in which the strength of the capillary force is represented by the moving distance of ink over a certain period of time, (A) is a front view,
(B) is an enlarged plan view of the same.

FIG. 4 is an enlarged longitudinal sectional view of a main part showing another embodiment of the writing instrument of the present invention of a direct liquid type.

FIG. 5 is an enlarged longitudinal sectional view of a main part showing still another embodiment of the direct writing type writing instrument of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ink tank 2,3 ... Core loading hole 4 ... Ink guide core 5 ... Writing part 6 ... Ink guide hole 7 ... Rotating body 12 ... Regulator 13,13-1,13-2,13-3 ... Fiber compression part

Claims (3)

[Claims]
1. A writing section for holding a rotating body is provided at the tip of an ink tank via an ink guide core inserted and inserted into a core loading hole of the ink tank, and ink is written by capillary force of the ink guide core. In the writing implement supplied to the portion, the writing portion has an ink guide hole communicating from the front end of the ink guide core formed of a fiber bundle to the rotating body at the tip, and the ink guide core communicating with the ink guide hole. A writing implement characterized by compressing the fiber at the end face side.
2. The writing instrument according to claim 1, wherein the fiber compression portion of the ink guide core is connected to the front fiber compression portion inserted and inserted into the ink guide hole, and the ink guide hole communicates with the ink guide core. A writing instrument comprising: a rear fiber compression section that is inserted and inserted into a flow hole.
3. The writing instrument according to claim 1, wherein the fiber compressing section is formed at a front end portion of the ink guiding core in a process of inserting the ink guiding core into the core loading hole and inserting the ink guiding core into communication with the ink guiding hole. A writing instrument, comprising a restricting portion for restricting an insertion amount of an ink guide core into a core loading hole.
JP8335730A 1996-12-16 1996-12-16 Writing instrument Pending JPH10166781A (en)

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JP8335730A JPH10166781A (en) 1996-12-16 1996-12-16 Writing instrument

Publications (1)

Publication Number Publication Date
JPH10166781A true JPH10166781A (en) 1998-06-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899128A1 (en) * 1997-08-29 1999-03-03 The Pilot Ink Co., Ltd. Direct liquid supply writing implement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899128A1 (en) * 1997-08-29 1999-03-03 The Pilot Ink Co., Ltd. Direct liquid supply writing implement
US5967687A (en) * 1997-08-29 1999-10-19 The Pilot Ink Co., Ltd. Direct liquid supply writing implement

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