JP5085960B2 - Direct liquid writing instrument - Google Patents

Direct liquid writing instrument Download PDF

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JP5085960B2
JP5085960B2 JP2007055244A JP2007055244A JP5085960B2 JP 5085960 B2 JP5085960 B2 JP 5085960B2 JP 2007055244 A JP2007055244 A JP 2007055244A JP 2007055244 A JP2007055244 A JP 2007055244A JP 5085960 B2 JP5085960 B2 JP 5085960B2
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ink
communication
rear end
ink tank
partition wall
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JP2008183895A (en
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哲宏 栗田
孝男 稲葉
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Pilot Ink Co Ltd
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Pilot Ink Co Ltd
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Description

本発明は、インキタンク内にインキを直に貯溜し、前記インキタンクとペン先との間にインキ吸蔵体を介在させた直液式筆記具に関する。尚、本発明において、「前」とはペン先側を指し、「後」とはインキタンク側を指す。 The present invention relates to a direct liquid writing instrument in which ink is directly stored in an ink tank and an ink occlusion body is interposed between the ink tank and a pen tip. In the present invention, “front” refers to the pen tip side, and “rear” refers to the ink tank side.

〔１〕従来、この種の直液式筆記具において、例えば、特許文献１には、「インク容体の上方開口部に連絡孔（連絡管）と貫通孔とを有し吸収性材を充填した収容体を挿嵌し吸収性材に連絡する筆穂を設け通気管を貫通孔に挿通し外気とインキ容体とを連絡したことを特徴とする筆記具。」が開示されている。 [1] Conventionally, in this type of direct liquid writing instrument, for example, Patent Document 1 discloses that “the upper opening of an ink container has a communication hole (communication tube) and a through hole and is filled with an absorbent material. A writing instrument characterized in that a brush is inserted into the body and communicated with the absorbent material, the ventilation tube is inserted into the through hole, and the outside air and the ink container are communicated.

前記特許文献１の直液式筆記具は、インク容体の上方開口部に連絡管及び通気管を備えているとしても、常時、通気管が外気と連通する構成である。そのため、ペン先下向き状態を維持すると、外気が通気管を通してインク容体内に供給し続けられると同時に、インク容体内のインキが連絡管を通して吸収性材に供給し続けられる。その結果、インキ容体内のインキがペン先側より外部に漏出するおそれがある。 The direct liquid writing instrument of Patent Document 1 has a configuration in which the vent pipe is always in communication with the outside air even if the connecting pipe and the vent pipe are provided in the upper opening of the ink container. For this reason, when the pen tip downward state is maintained, the outside air continues to be supplied to the ink container through the vent pipe, and at the same time, the ink in the ink container continues to be supplied to the absorbent material through the connecting pipe. As a result, the ink in the ink container may leak out from the pen tip side.

〔２〕また、従来、特許文献２には、「容器本体内の一側に密閉用蓋体を着脱可能としたインキ補給口を有するインキ収納室を設けると共に、本体先端開口部側には上記インキ収納室とは隔壁にて分離されたインキ吸液材収納室を開口部と連通する状態として設け、該収納室内には二分割された通気性を有する吸液材を収納し、且つ先端開口部側の吸液材にはペン先の基部を抱持させると共にその基部端面はインキ収納室側の吸液材を接触させ、上記隔壁には収納インキを吸液材へ給液させるための給液孔を穿設すると共に、適宜な給気管を固定させ且つこの給気管の一方の端面開口部を本体先端開口部側の吸液材に当接させ、他方の端面開口部をインキ補給口附近のインキ収納室内に位置させたことを特徴とするサインペン。」が開示されている。 [2] Conventionally, Patent Document 2 states that “an ink storage chamber having an ink supply port in which a sealing lid is detachable is provided on one side of a container body, and the above-mentioned main body opening portion side The ink storage chamber is provided with a state in which an ink absorbing material storage chamber separated by a partition wall is communicated with the opening, and the storage chamber stores a liquid absorbing material having air permeability divided into two, and has a front end opening. The base side of the pen tip is held by the liquid-absorbing material on the part side, and the liquid-absorbing material on the side of the ink storage chamber is brought into contact with the end surface of the base. A liquid hole is drilled, an appropriate air supply pipe is fixed, one end face opening of this air supply pipe is brought into contact with the liquid absorbing material on the front end opening side of the main body, and the other end face opening is close to the ink supply port. Sign pen characterized by being positioned in the ink storage chamber of There.

前記特許文献２の直液式筆記具は、二つの吸液材を備え、給気管の前端面を本体先端開口部側の吸液材の後端面に当接させ、給液孔がインキ収納室側の吸液材の後端面に連通する構成、即ち、給気管の前端開口部と給液孔の前端開口部とが前後に離れて位置する構成である。そのため、給液孔から供給されて吸液材に含浸されたインキによって給気管の開口端を塞ぐこと（即ち給気管の開口端を液シール状態にすること）が困難となり、インキタンクからのインキ流出とインキタンクへの空気流入（即ちインキと空気の交替）を確実に停止させることができない。その結果、過剰のインキが吸液材に供給され、インキがペン先側より外部に漏出するおそれがある。 The direct liquid writing instrument of Patent Document 2 includes two liquid-absorbing materials, the front end surface of the air supply pipe is brought into contact with the rear end surface of the liquid-absorbing material on the front end of the main body, and the liquid supply hole is on the ink storage chamber side. In this configuration, the front end opening of the air supply pipe and the front end opening of the liquid supply hole are spaced apart from each other. For this reason, it becomes difficult to close the open end of the supply pipe with ink supplied from the liquid supply hole and impregnated in the liquid absorbing material (that is, to make the open end of the supply pipe liquid-sealed). The outflow and the air inflow into the ink tank (that is, the change of ink and air) cannot be stopped reliably. As a result, excessive ink may be supplied to the liquid absorbing material, and the ink may leak out from the pen tip side.

さらに、前記特許文献２の直液式筆記具は、ペン先が、本体先端開口部側の吸液材を貫通して、インキ収納室側の吸液材に接触する構成のため、ペン先の長手寸法を短く設定することが困難である。そのため、ペン先のコストが上昇し、ユーザーに安価に提供できず、しかも、ペン先後端からペン先先端までのインキ流出路が長くなり、ペン先からのインキ流出性が低下し、筆跡カスレや筆跡途切れが生じやすい。 Furthermore, the direct liquid type writing instrument of Patent Document 2 has a configuration in which the pen tip penetrates the liquid absorbing material on the side of the main body opening and contacts the liquid absorbing material on the ink storage chamber side. It is difficult to set the dimensions short. As a result, the cost of the pen tip increases and cannot be provided to the user at a low cost, and the ink outflow path from the pen tip rear end to the tip of the pen tip becomes longer, the ink outflow from the pen tip decreases, Handwriting breaks easily occur.

〔３〕また、従来、特許文献３には、「前軸内にインキ調整管、インキ導管を同心に配置し、インキ導管に中継芯を挿入し、その後端をインキ室（インキタンク）に挿入し、先端を毛筆体後端に所定の間隙を存して位置させ、インキ調整管とインキ導管間の環状路内及び毛筆体後端上には多孔質材からなるインキ吸収体を装着し、その先端の密度を他の部分より大となし、毛筆体後端にはインキ通路を形成し、前軸内面とインキ調整管外面間には外気に連通した空気通路を形成し、該空気通路後端とインキ調整管後端とを連通してなる毛筆状筆記具。」が開示されている。 [3] Conventionally, Patent Document 3 states that “an ink adjusting tube and an ink conduit are concentrically arranged in the front shaft, a relay core is inserted into the ink conduit, and a rear end thereof is inserted into the ink chamber (ink tank). The tip is located at the back end of the brush body with a predetermined gap, and an ink absorber made of a porous material is mounted in the annular path between the ink adjusting tube and the ink conduit and on the back end of the brush body, The tip has a higher density than the other parts, an ink passage is formed at the rear end of the brush, and an air passage communicating with the outside air is formed between the inner surface of the front shaft and the outer surface of the ink adjusting tube. "A brush-like writing instrument in which the end communicates with the rear end of the ink adjusting tube."

前記特許文献３の直液式筆記具は、一本のインキ導管のみによって、インキタンクとインキ吸収体とを接続する構成であるため、初期インキ出し時（即ちインキタンクから吸液材に最初にインキを供給する時）に迅速に空気とインキが交替せず、筆記可能になるまでにかなりの時間を要する。また、前記特許文献３の直液式筆記具は、部品点数が多く、構造が複雑であり、ユーザーに安価に提供することが困難である。 Since the direct liquid type writing instrument of Patent Document 3 is configured to connect the ink tank and the ink absorber by only one ink conduit, at the time of initial ink discharge (that is, the ink is first transferred from the ink tank to the liquid absorbing material). It takes a considerable amount of time before the writing becomes possible because the air and ink do not change rapidly. The direct liquid writing instrument of Patent Document 3 has a large number of parts, a complicated structure, and is difficult to provide to users at low cost.

実公昭４５−１８８９０号公報Japanese Utility Model Publication No. 45-18890 実公昭５６−７５０４号公報Japanese Utility Model Publication No. 56-7504 実公昭６０−７１９１号公報Japanese Utility Model Publication No. 60-7191

本発明は前記従来の問題点を解決するものであって、インキタンク内のインキがペン先側より漏出するおそれがなく、また、ペン先の長手寸法を短くし、ペン先のコストを抑えるとともにペン先からのインキ流出性を円滑にでき、しかも、初期インキ出し時に迅速に空気とインキが交替し、短時間で筆記可能となり、さらに、簡易な構造にでき、その上、インキタンク内の圧力が急激に変化した場合でも、ペン先側からのインキ漏出やインキ吹き出しを防止できる直液式筆記具を提供しようとするものである。 The present invention solves the above-mentioned conventional problems, and there is no possibility that the ink in the ink tank leaks from the pen tip side, and the length of the pen tip is shortened to reduce the cost of the pen tip. The ink can be smoothly discharged from the nib, and the air and ink can be changed quickly at the time of initial ink discharge, writing can be done in a short time, and the structure can be simplified, and the pressure in the ink tank An object of the present invention is to provide a direct liquid-type writing instrument that can prevent ink leakage and ink blowing from the pen tip side even when the temperature changes rapidly.

（構成１）
本発明は、ペン先２と、前記ペン先２の後端に接続されるインキ吸蔵体３と、前記インキ吸蔵体３の後方に配置され、インキを直に貯溜するインキタンク７と、前記インキタンク７と前記インキ吸蔵体３との間を接続する連通管６とからなる直液式筆記具であって、前記連通管６を複数備え、インキ吸蔵体３とインキタンク７との間に隔壁５２を設け、前記隔壁５２前面より前方に前記連通管６の各々を突出させ、前記連通管６の各々の前端をインキ吸蔵体３内部に位置させ、少なくとも１本の連通管６ｂを前記隔壁５２後面より後方に突出させ、その連通管６ｂの後端をインキタンク７内部に位置させたこと（構成１）を要件とする。 (Configuration 1)
The present invention includes a nib 2, an ink storage 3 connected to the rear end of the nib 2, an ink tank 7 disposed behind the ink storage 3 and directly storing ink, and the ink A direct liquid type writing instrument comprising a tank 7 and a communication pipe 6 connecting between the ink storage body 3, comprising a plurality of the communication pipes 6, and a partition wall 52 between the ink storage body 3 and the ink tank 7. Each of the communication pipes 6 is projected forward from the front surface of the partition wall 52, the front end of each of the communication pipes 6 is positioned inside the ink storage body 3, and at least one communication pipe 6b is connected to the rear surface of the partition wall 52. The requirement is that the rear end of the communication pipe 6b is positioned inside the ink tank 7 (Configuration 1).

前記直液式筆記具１（構成１）において、前記隔壁５２後面より後方に突出する連通管６ｂの後端は、ペン先２の向きやインキタンク７内のインキ残量によって、インキ液面より上方に位置する場合と、インキ液面より下方（即ちインキ中）に位置する場合がある。前記隔壁５２後面より後方に突出する連通管６ｂの後端が、インキ液面より上方に位置する状態の場合、前記後方に突出した連通管６ｂにより、インキタンク７と外気との間の空気流通がなされ、他の連通管６ａによりインキタンク７とインキ吸蔵体３との間のインキ流通がなされる。一方、前記隔壁５２後面より後方に突出する連通管６ｂの後端が、インキ液面より下方に位置する状態の場合、少なくとも１本の連通管６により、インキタンク７と外気との間の空気流通がなされ、他の連通管６によりインキタンク７とインキ吸蔵体３との間のインキ流通がなされる。 In the direct liquid writing instrument 1 (Configuration 1), the rear end of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 is above the ink liquid surface depending on the direction of the pen tip 2 and the remaining amount of ink in the ink tank 7. Or located below the ink level (ie, in the ink). When the rear end of the communication pipe 6b protruding rearward from the rear face of the partition wall 52 is positioned above the ink liquid level, the air flow between the ink tank 7 and the outside air is caused by the communication pipe 6b protruding rearward. Ink is circulated between the ink tank 7 and the ink occlusion body 3 by the other communication pipe 6a. On the other hand, when the rear end of the communication tube 6b protruding rearward from the rear surface of the partition wall 52 is located below the ink liquid surface, the air between the ink tank 7 and the outside air is provided by at least one communication tube 6. The ink is distributed between the ink tank 7 and the ink occlusion body 3 through another communication pipe 6.

前記直液式筆記具１（構成１）において、インキタンク７内のインキをインキ吸蔵体３に供給する際、ペン先２を下向き状態にすると、重力によりインキタンク７内のインキが、少なくとも１本の連通管６を通って、インキ吸蔵体３に供給され、インキ吸蔵体３内部において含浸される。それと同時に、外気が他の連通管６を通ってインキタンク７内に取り込まれる。前記インキ吸蔵体３の内部に含浸されたインキが一定量になると、前記外気を取り込んでいた他の連通管６の前端開口部が、前記含浸インキによる液シール状態となり一時的に閉鎖され、インキタンク７内への外気の供給は停止される。それと同時に、前記インキ供給を行っていた連通管６によるインキタンク７からインキ吸蔵体３へのインキ供給も停止され、その結果、連通管６の各々の前端開口部が液シール状態となり一時的に閉鎖され、インキタンク７からのインキ流出とインキタンク７への空気流入（即ちインキと空気の交替）が停止状態となる。 In the direct liquid writing instrument 1 (configuration 1), when the ink in the ink tank 7 is supplied to the ink occlusion body 3, when the pen tip 2 is turned downward, at least one ink in the ink tank 7 is caused by gravity. The ink storage body 3 is supplied through the communication pipe 6 and impregnated inside the ink storage body 3. At the same time, the outside air is taken into the ink tank 7 through the other communication pipe 6. When the ink impregnated inside the ink occlusion body 3 reaches a certain amount, the front end opening of the other communication pipe 6 that has taken in the outside air is in a liquid-sealed state with the impregnating ink and temporarily closed. The supply of outside air into the tank 7 is stopped. At the same time, the ink supply from the ink tank 7 to the ink occluding body 3 by the communication pipe 6 that has been supplying the ink is also stopped. As a result, the front end opening of each of the communication pipes 6 is in a liquid-sealed state temporarily. The ink tank 7 is closed, and the ink outflow from the ink tank 7 and the air inflow into the ink tank 7 (that is, replacement of ink and air) are stopped.

前記直液式筆記具１（構成１）は、前記連通管６の各々の前端がインキ吸蔵体３内部に位置する構成であるため、連通管６の各々の前端開口部の全てを、インキ吸蔵体３の内部に含浸されたインキの液シールによって容易に閉鎖することができる。その結果、インキタンク７からインキ吸蔵体３に過剰のインキを供給することがなく、ペン先２側より外部にインキが漏出するおそれがない。 The direct liquid writing instrument 1 (Configuration 1) has a configuration in which the front end of each of the communication pipes 6 is positioned inside the ink storage body 3, so that all of the front end openings of the communication pipes 6 are disposed in the ink storage body. 3 can be easily closed by a liquid seal of ink impregnated in the interior of 3. As a result, excess ink is not supplied from the ink tank 7 to the ink occlusion body 3, and there is no possibility that the ink leaks outside from the pen tip 2 side.

また、前記直液式筆記具１（構成１）は、連通管６を複数本（即ち２本以上）、有することにより、少なくとも一つの連通管６がインキ供給を行う場合、他の連通管６が空気供給を行うことになる。そのため、初期インキ出し時（即ち、インキが含浸されていないインキ吸蔵体３に最初にインキを供給する場合）に迅速にインキと空気との交替が行われ、短時間で筆記可能となる。 Further, the direct liquid writing instrument 1 (Configuration 1) has a plurality of communication pipes 6 (that is, two or more), and when at least one of the communication pipes 6 supplies ink, the other communication pipes 6 Air supply will be performed. Therefore, at the time of initial ink ejection (that is, when ink is first supplied to the ink occlusion body 3 not impregnated with ink), the ink and air are quickly replaced, and writing can be performed in a short time.

また、前記直液式筆記具１（構成１）は、温度上昇等によりインキタンク７内の圧力が上昇した際、インキタンク７内より押し出された余剰のインキは、前記連通管６を通ってインキ吸蔵体３の内部に供給され、インキ吸蔵体３の内部に一時的に含浸される。一方、温度低下等によりインキタンク７内の圧力が減少した際、インキ吸蔵体３の内部に含浸されたインキが、連通管６を通ってインキタンク７内に戻される。それにより、インキタンク７内が圧力変化した際、インタンク７内の余剰インキを適正にインキ吸蔵体３に一時的に吸収させ、その後、その余剰インキをインキタンク７へ適正に戻すことができる。その結果、インキが外部に漏出することを十分に防止できる。 Further, when the pressure in the ink tank 7 rises due to a temperature rise or the like, the direct liquid writing instrument 1 (Configuration 1) causes the excess ink pushed out from the ink tank 7 to pass through the communication pipe 6. The ink is supplied into the occlusion body 3 and is temporarily impregnated in the ink occlusion body 3. On the other hand, when the pressure in the ink tank 7 decreases due to a temperature drop or the like, the ink impregnated in the ink storage body 3 is returned to the ink tank 7 through the communication pipe 6. As a result, when the pressure in the ink tank 7 changes, the excess ink in the in-tank 7 can be appropriately absorbed by the ink storage 3 and then the excess ink can be properly returned to the ink tank 7. . As a result, the ink can be sufficiently prevented from leaking to the outside.

さらに、前記直液式筆記具１（構成１）は、少なくとも1本の連通管６ｂを前記隔壁５２後面より後方に突出させ且つその連通管６ｂの後端をインキタンク７内部に位置させたことにより、ペン先下向き状態で急激な圧力変化が生じた場合、インキタンク７内の加圧空気が、前記隔壁５２の後面より後方に突出する連通管６ｂの後端開口部から、該連通管６ｂの内部を通り、次に、インキ吸蔵体３の内部を通って、迅速に外部に放出され，ペン先２側からインキが外部に漏出したり吹き出したりするおそれがない。即ち、前記直液式筆記具１（構成１）は、ペン先下向き状態でインキタンク７内の圧力が急激に変化した場合でも、ペン先２側からのインキ漏出やインキ吹き出しを防止できる。 Further, the direct liquid writing instrument 1 (Configuration 1) is configured such that at least one communication pipe 6b protrudes rearward from the rear surface of the partition wall 52 and the rear end of the communication pipe 6b is positioned inside the ink tank 7. When a sudden pressure change occurs in the state where the pen tip is downward, the pressurized air in the ink tank 7 passes through the rear end opening of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52. The ink passes through the inside and then passes through the inside of the ink occlusion body 3 and is quickly discharged to the outside, so that there is no possibility that the ink leaks or blows out from the pen tip 2 side. That is, the direct liquid writing instrument 1 (Configuration 1) can prevent ink leakage or ink blowing from the pen tip 2 side even when the pressure in the ink tank 7 changes suddenly in a state where the pen tip is downward.

特に、ペン先下向き時、前記後方に突出する連通管６ｂの後端が、インキ液面より上方に位置していない場合であっても、インキ液面から前記後方に突出する連通管６ｂの後端までの距離が、インキ液面から隔壁５２後面までの距離（即ち隔壁５２後面より後方に突出しない連通管６ａの後端とインキ液面との距離）に比べて短いため、ペン先下向き状態でインキタンク内の圧力が急激に変化した場合、インキタンク７内の多量のインキがインキ吸蔵体３に押し出されることなく、各々の連通管６を通ってインキタンク７内から僅かの余剰インキがインキ吸蔵体３に押し出されてインキ吸蔵体３に保持された後、即座に、前記後方に突出する連通管６ｂの後端開口部とインキ液面の上方の空間とが連通され、インキ液面の上方の加圧空気が、前記後方に突出する連通管６ｂを通って外部に放出される。それにより、ペン先下向き状態で急激な圧力変化が生じた場合でも、ペン先２側からのインキ漏出やインキ吹き出しを十分に防止できる。 In particular, when the pen tip is downward, the rear end of the communication pipe 6b protruding rearward is not located above the ink liquid level, but the rear of the communication pipe 6b protruding rearward from the ink liquid level. Since the distance to the end is shorter than the distance from the ink liquid surface to the rear surface of the partition wall 52 (that is, the distance between the rear end of the communication pipe 6a that does not protrude rearward from the rear surface of the partition wall 52 and the ink liquid surface), When the pressure in the ink tank changes abruptly, a large amount of ink in the ink tank 7 is not pushed out to the ink occlusion body 3, but a little excess ink is passed from the ink tank 7 through each communication pipe 6. Immediately after being pushed out by the ink occlusion body 3 and held by the ink occlusion body 3, the rear end opening of the communication pipe 6b protruding rearward and the space above the ink liquid surface communicate with each other. Pressurized air above It is discharged to the outside through the communicating pipe 6b protruding serial backward. Thereby, even when a sudden pressure change occurs in the pen tip downward state, it is possible to sufficiently prevent ink leakage and ink blowing from the pen tip 2 side.

尚、前記インキタンク７内の圧力が急激に変化する場合とは、例えば、低温環境下でキャップをペン先側に装着した後、高温環境下でインキタンク７内の空気が加圧された状態においてペン先側からキャップを取り外す場合、または、地上の１気圧状態でキャップをペン先側に装着した後、航空機内等の減圧状態においてペン先側からキャップを取り外す場合が挙げられる。 The case where the pressure in the ink tank 7 suddenly changes is, for example, a state in which the air in the ink tank 7 is pressurized in a high temperature environment after the cap is attached to the pen tip side in a low temperature environment. In the case of removing the cap from the pen tip side, or after removing the cap from the pen tip side in a decompressed state such as in an airplane after the cap is attached to the pen tip side at 1 atmosphere pressure on the ground.

（構成２）
本発明は、前記構成１の直液式筆記具１において、前記連通管６の各々の前端の軸方向の位置が互いに等しく設定されてなること（構成２）を要件とする。 (Configuration 2)
The present invention requires that the axial positions of the front ends of the communication pipes 6 are set equal to each other in the direct liquid writing instrument 1 having the configuration 1 (configuration 2).

前記直液式筆記具１（構成２）は、前記連通管６の各々の前端の軸方向の位置が互いに等しく設定される構成（即ち連通管６の各々の前端が互いに前後に離れていない構成）であるため、インキ吸蔵体３の内部における連通管６の各々の前端の相互間の距離が一層短くなり、連通管６の各々の前端開口部の液シール性が向上し、外部へのインキ漏出を、より一層防止できる。 In the direct liquid writing instrument 1 (Configuration 2), the axial positions of the front ends of the communication tubes 6 are set to be equal to each other (that is, the front ends of the communication tubes 6 are not separated from each other in the front-rear direction). Therefore, the distance between the front ends of the communication pipes 6 inside the ink occlusion body 3 is further shortened, the liquid sealability of the front end openings of the communication pipes 6 is improved, and ink leaks to the outside. Can be further prevented.

（構成３）
本発明は、前記構成１または２の直液式筆記具１において、前記連通管６の各々の前端がインキ吸蔵体３内部のペン先２後端近傍に位置されてなること（構成３）を要件とする。が好ましい。 (Configuration 3)
The present invention requires that the front end of each of the communication pipes 6 is positioned in the vicinity of the rear end of the pen tip 2 inside the ink occlusion body 3 in the direct liquid writing instrument 1 having the configuration 1 or 2 (configuration 3). And Is preferred.

前記直液式筆記具１（構成３）は、連通管６の各々の前端がペン先２後端近傍に位置する構成によって、いずれの連通管６の前端開口部からインキが供給されても、ペン先２にインキを迅速に供給できる。それにより、初期インキ出し時、確実に、短時間で筆記可能となる。 The direct liquid writing instrument 1 (configuration 3) has a configuration in which each front end of the communication pipe 6 is positioned in the vicinity of the rear end of the pen tip 2, so that no matter which ink is supplied from the front end opening of any communication pipe 6, The ink can be quickly supplied to the tip 2. As a result, writing can be performed reliably in a short time when the initial ink is dispensed.

（構成４）
本発明は、前記構成１乃至３のいずれかの直液式筆記具１において、前記連通管６の各々の前端が前記インキ吸蔵体３の内部前方に位置し、前記ペン先２の後端が前記インキ吸蔵体３の内部前方に位置してなること（構成４）を要件とする。 (Configuration 4)
According to the present invention, in the direct liquid writing instrument 1 according to any one of the configurations 1 to 3, the front end of each of the communication pipes 6 is located in front of the ink storage body 3, and the rear end of the pen tip 2 is It is a requirement that the ink storage member 3 is positioned in front of the inside (configuration 4).

前記直液式筆記具１（構成４）は、ペン先２の後端がインキ吸蔵体３の内部前方に位置しているため、ペン先２全体の長手寸法を短く設定できる。その結果、インキタンク７からの潤沢なインキが、連通管６を通ってインキ吸蔵体３の内部前方を介してペン先２後端に供給された後、前記ペン先２先端に迅速に供給されるため、筆跡途切れや筆跡カスレのない、ペン先２からの円滑なインキ流出性が得られる。また、ペン先２全体の長手寸法を短く設定できることから、ペン先２のコストを安価に抑えることもできる。 In the direct liquid writing instrument 1 (configuration 4), since the rear end of the pen tip 2 is located in front of the ink occlusion body 3, the longitudinal dimension of the entire pen tip 2 can be set short. As a result, abundant ink from the ink tank 7 is supplied to the rear end of the pen tip 2 through the communication pipe 6 and through the front inside of the ink occlusion body 3 and then rapidly supplied to the front end of the pen tip 2. Therefore, smooth ink outflow from the nib 2 without handwriting breakage or handwriting blur is obtained. Moreover, since the longitudinal dimension of the entire nib 2 can be set short, the cost of the nib 2 can be reduced at a low cost.

また、前記直液式筆記具１（構成４）は、温度上昇等によりインキタンク７内の圧力が上昇した際、インキタンク７内より押し出された余剰のインキは、前記連通管６を通ってインキ吸蔵体３の内部前方に供給され、さらに、インキ吸蔵体３の内部後方に供給され一時的に含浸される。一方、温度低下等によりインキタンク７内の圧力が減少した際、インキ吸蔵体３の内部後方に含浸されたインキが、インキ吸蔵体３の内部前方から連通管６を通ってインキタンク７内に戻される。 Further, when the pressure in the ink tank 7 rises due to a temperature rise or the like, the direct liquid writing instrument 1 (configuration 4) causes the excess ink pushed out from the ink tank 7 to pass through the communication pipe 6 to the ink. The ink is supplied to the front side of the occlusion body 3 and further supplied to the rear side of the ink occlusion body 3 to be temporarily impregnated. On the other hand, when the pressure in the ink tank 7 decreases due to a temperature drop or the like, the ink impregnated in the rear side of the ink storage body 3 passes through the communication pipe 6 from the front side of the ink storage body 3 into the ink tank 7. Returned.

即ち、前記直液式筆記具１（構成４）は、連通管６の各々の前端がインキ吸蔵体３の内部前方に位置する構成により、インキタンク７内が圧力変化した際、インタンク７内の余剰インキを適正にインキ吸蔵体３に一時的に吸収させ、その後、その余剰インキをインキタンク７へ適正に戻すことができる。その結果、インキが外部に漏出することを十分に防止できる。 That is, the direct liquid writing instrument 1 (configuration 4) has a configuration in which the front ends of the communication pipes 6 are located in front of the ink storage body 3, and the pressure in the ink tank 7 changes when the pressure in the ink tank 7 changes. The excess ink can be appropriately absorbed by the ink occlusion body 3 and then the excess ink can be properly returned to the ink tank 7. As a result, the ink can be sufficiently prevented from leaking to the outside.

（構成５）
本発明は、前記構成１乃至４のいずれかの直液式筆記具１において、前記ペン先２の後端と前記連通管６の各々の前端との間は、前記インキ吸蔵体３を介してインキ流通可能に接続されること（構成５）を要件とする。 (Configuration 5)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 4, the present invention provides ink between the rear end of the nib 2 and the front end of each of the communication pipes 6 via the ink occlusion body 3. It is required to be connected so that it can be distributed (Configuration 5).

前記直液式筆記具１（構成５）は、前記ペン先２の後端と、前記連通管６の各々の前端とが、直接接続されていないため、少なくともペン先２の後端と連通管６の各々の前端との間のインキ吸蔵体３内部には一定量のインキが含浸されている。それにより、ペン先上向き状態や筆記具本体の水平状態などのインキタンク７からのインキ供給が無い場合でも、前記ペン先２の後端と連通管６の各々の前端との間のインキ吸蔵体３内部に含浸されたインキによって十分に筆記可能となる。 In the direct liquid writing instrument 1 (configuration 5), since the rear end of the pen tip 2 and the front end of each of the communication pipes 6 are not directly connected, at least the rear end of the pen tip 2 and the communication pipe 6 are used. A predetermined amount of ink is impregnated in the ink storage body 3 between each of the front ends. Thereby, even when there is no ink supply from the ink tank 7 such as the pen tip upward state or the writing instrument main body horizontal state, the ink occlusion body 3 between the rear end of the pen tip 2 and the front end of each of the communication pipes 6. The ink impregnated inside can be sufficiently written.

（構成６）
本発明は、前記構成１乃至５のいずれかの直液式筆記具１において、前記連通管６の各々の前端をインキ吸蔵体３の後端から前方に挿入し、インキ吸蔵体３の内部を前方に押圧圧縮することによって、前記連通管６の各々の前端近傍のインキ吸蔵体３の密度を、前記連通管６の各々の前端近傍以外の部分のインキ吸蔵体３の密度よりも高く設定したこと（構成６）を要件とする。 (Configuration 6)
According to the present invention, in the direct liquid writing instrument 1 having any one of the configurations 1 to 5, the front end of each of the communication pipes 6 is inserted forward from the rear end of the ink storage body 3, and the interior of the ink storage body 3 is moved forward. The density of the ink storage body 3 in the vicinity of the front end of each of the communication pipes 6 is set higher than the density of the ink storage body 3 in a portion other than the vicinity of the front end of each of the communication pipes 6 by being pressed and compressed. (Configuration 6) is a requirement.

前記直液式筆記具１（構成６）は、インキ吸蔵体３が、連通管６の各々の前端近傍の密度を高く設定した部分（毛細管力の大きい高密度部３１）と、連通管６の各々の前端近傍以外の密度を低く設定した部分（毛細管力の小さい低密度部３２）とを備える。そのため、インキ吸蔵体３内部におけるインキを、低密度部３２よりも高密度部３１に、優先して含浸させることができる。それにより、連通管６の各々の前端開口部を含浸インキによって、確実に液シールできる。その結果、温度低下等によりインキタンク７内の圧力が減少した際、インキ吸蔵体３内に含浸されたインキが、インキ吸蔵体３内に残留することがなく、インキ吸蔵体３の高密度部３１から連通管６を通って、適正にインキタンク７内に戻される。 In the direct liquid writing instrument 1 (configuration 6), the ink occlusion body 3 has a portion where the density in the vicinity of the front end of each of the communication tubes 6 is set high (a high-density portion 31 having a large capillary force), and each of the communication tubes 6. A portion where the density other than the vicinity of the front end is set low (low density portion 32 having a small capillary force). Therefore, the ink in the ink occlusion body 3 can be preferentially impregnated in the high density portion 31 rather than the low density portion 32. Thereby, each front end opening of the communication pipe 6 can be reliably liquid-sealed with the impregnation ink. As a result, when the pressure in the ink tank 7 decreases due to a temperature drop or the like, the ink impregnated in the ink storage body 3 does not remain in the ink storage body 3, and the high density portion of the ink storage body 3 From 31, it passes through the communication pipe 6 and is properly returned into the ink tank 7.

また、前記直液式筆記具１（構成６）は、インキ吸蔵体３の密度差（即ちインキ吸蔵体３の高密度部３１と低密度部３２）を、連通管６の各々の前端を前記インキ吸蔵体３の後端から前方に挿入し、インキ吸蔵体３の内部を前方に押圧圧縮することによって形成するため、連通管６をインキ吸蔵体３に組み込む前に、予めインキ吸蔵体３に密度差を設ける必要がなく、製造が極めて容易となる。 Further, the direct liquid writing instrument 1 (configuration 6) has a difference in density of the ink occluding body 3 (that is, the high density portion 31 and the low density portion 32 of the ink occluding body 3), and the front end of each communicating tube 6 is connected to the ink. Since the inside of the ink storage body 3 is inserted forward from the rear end of the storage body 3 and pressed and compressed inside, the density of the ink storage body 3 is set in advance before the communication tube 6 is incorporated into the ink storage body 3. There is no need to provide a difference, and manufacturing becomes extremely easy.

（構成７）
本発明は、前記構成１乃至６の直液式筆記具１において、開栓前のインキタンク７の前端開口部を栓体７１によって閉鎖し、前記隔壁５２後面より後方に接続管５４を突出させ、前記接続管５４を前記インキタンク７の前端開口部内に挿着し、前記接続管５４が前記栓体７１を押圧することによって前記インキタンク７を開栓してなり、前記隔壁５２後面より後方に突出された連通管６ｂが前記接続管５４の内側に位置し、前記隔壁５２後面より後方に突出された連通管６ｂの後端が前記接続管５４の後端より前方に位置するかまたは前記隔壁５２後面より後方に突出された連通管６ｂの後端と前記接続管５４の後端との軸方向の位置が略一致してなること（構成７）を要件とする。 (Configuration 7)
In the direct liquid writing instrument 1 having the configurations 1 to 6, the present invention closes the front end opening of the ink tank 7 before opening with the stopper 71, and causes the connecting pipe 54 to protrude rearward from the rear surface of the partition wall 52. The connecting pipe 54 is inserted into the front end opening of the ink tank 7, and the connecting pipe 54 presses the plug 71 to open the ink tank 7. The protruding communication pipe 6b is positioned inside the connection pipe 54, and the rear end of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 is positioned forward of the rear end of the connection pipe 54 or the partition wall. The axial position of the rear end of the communication pipe 6b protruding rearward from the rear surface of the 52 and the rear end of the connecting pipe 54 is substantially the same (Configuration 7).

前記直液式筆記具１（構成７）は、接続管５４をインキタンク７の前端開口部に挿着した時、接続管５４が栓体７１を適正に押圧してインキタンク７を確実に開栓でき、しかも、インキタンク７の開栓時にインキタンク内のインキが外部に漏出するおそれがない。もし、隔壁５２後面より後方に突出された連通管６ｂの後端が接続管５４の後端より後方に大きく突出していると、接続管５４をインキタンク７の前端開口部に挿着した時、前記連通管６ｂが栓体７１に当接し、インキタンク７を確実に開栓できないおそれや、接続管５４がインキタンク７の前端開口部に完全に挿着される前にインキタンク７の前端開口部より栓体７１が外れ、インキが外部に漏出するおそれがある。 When the connecting pipe 54 is inserted into the front end opening of the ink tank 7, the direct liquid writing instrument 1 (configuration 7) presses the plug 71 properly and the ink tank 7 is reliably opened. In addition, there is no possibility that the ink in the ink tank leaks outside when the ink tank 7 is opened. If the rear end of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 protrudes greatly rearward from the rear end of the connection pipe 54, when the connection pipe 54 is inserted into the front end opening of the ink tank 7, There is a risk that the communication pipe 6b abuts against the plug 71 and the ink tank 7 cannot be reliably opened, or the front end opening of the ink tank 7 is inserted before the connection pipe 54 is completely inserted into the front end opening of the ink tank 7. There is a possibility that the plug 71 is detached from the portion and the ink leaks to the outside.

（構成８）
本発明は、前記構成７の直液式筆記具１において、インキタンク７の開栓時に前記栓体７１の片側を押圧する突片５４ａを前記接続管５４後端の片側に設け、前記隔壁５２後面より後方に突出された連通管６ｂの外面と前記突片５４ａの内面とを近接させてなること（構成８）を要件とする。 (Configuration 8)
According to the present invention, in the direct liquid writing instrument 1 having the configuration 7, a protruding piece 54a that presses one side of the plug body 71 when the ink tank 7 is opened is provided on one side of the rear end of the connecting pipe 54, and the rear surface of the partition wall 52 It is a requirement that the outer surface of the communication pipe 6b that protrudes further rearward and the inner surface of the protruding piece 54a be close to each other (Configuration 8).

前記直液式筆記具１（構成８）は、インキタンク７の開栓時、突片５４ａが栓体７１の片側を押圧することによって、栓体７１を適正に外すことができる。もし、前記隔壁５２後面より後方に突出された連通管６ｂの外面と前記突片５４ａの内面とが近接しない構成の場合、インキタンク７の開栓時、前記隔壁５２後面より後方に突出された連通管６ｂが、栓体７１に当接し、栓体７１の円滑な開栓作動を妨げ、インキタンク７の適正な開栓がなしえないおそれがある。 When the ink tank 7 is opened, the direct liquid writing instrument 1 (Configuration 8) can properly remove the plug 71 by pressing one side of the plug 71 with the protruding piece 54a. If the outer surface of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 is not close to the inner surface of the protruding piece 54a, the ink tank 7 is protruded rearward from the rear surface of the partition wall 52 when the ink tank 7 is opened. There is a possibility that the communication pipe 6b abuts against the plug body 71, hinders the smooth opening operation of the plug body 71, and the ink tank 7 cannot be properly opened.

（構成９）
本発明は、前記構成１乃至８のいずれかの直液式筆記具１において、前記インキ吸蔵体３の容積Ｖ２を、前記インキタンク７と前記各々の連通管６とからなる空間の容積Ｖ１の４０％以上（好ましくは５０％以上）に設定したこと（構成９）を要件とする。 (Configuration 9)
According to the present invention, in the direct liquid writing instrument 1 having any one of the configurations 1 to 8, the volume V2 of the ink occlusion body 3 is set to 40 of the volume V1 of the space formed by the ink tank 7 and the communication pipes 6. % (Preferably 50% or more) (configuration 9) is a requirement.

前記直液式筆記具１（構成９）は、前記容積Ｖ１に対する前記容積Ｖ２の比率を４０％以上（好ましくは５０％以上）に設定したことにより、インキタンク７内の圧力が急激に変化した場合、インキタンク７内のインキ８が連通管６を通して勢いよく押し出されても、該インキ８がインキ吸蔵体３内に適正に含浸される。それにより、ペン先２側より外部にインキが漏出したり吹き出したりすることを十分に防止できる。 In the direct liquid writing instrument 1 (Configuration 9), when the ratio of the volume V2 to the volume V1 is set to 40% or more (preferably 50% or more), the pressure in the ink tank 7 rapidly changes. Even if the ink 8 in the ink tank 7 is pushed out through the communication pipe 6, the ink 8 is properly impregnated in the ink occlusion body 3. Thereby, it is possible to sufficiently prevent the ink from leaking out or blowing out from the pen tip 2 side.

前記容積Ｖ１に対する前記容積Ｖ２の比率が４０％未満の場合、インキタンク７内の圧力が急激に変化した際、インキタンク７からの十分な量のインキをインキ吸蔵体３で保持できないおそれがある。前記直液式筆記具１（構成９）において、前記容積Ｖ２は、前記容積Ｖ１の７０％以下に設定することが好ましい。前記容積Ｖ１に対する前記容積Ｖ２の比率が７０％を超える場合、インキタンク７内に収容するインキ量が過剰に小さくなって、筆記可能距離が短くなるため、実用的ではない。前記容積Ｖ２の容積Ｖ１に対する比率は４０％〜７０％の範囲、好ましくは、５０％〜７０％の範囲に設定することが有効である。 When the ratio of the volume V2 to the volume V1 is less than 40%, there is a possibility that a sufficient amount of ink from the ink tank 7 cannot be held by the ink occlusion body 3 when the pressure in the ink tank 7 changes abruptly. . In the direct liquid writing instrument 1 (Configuration 9), the volume V2 is preferably set to 70% or less of the volume V1. When the ratio of the volume V2 to the volume V1 exceeds 70%, the amount of ink stored in the ink tank 7 becomes excessively small and the writable distance becomes short, which is not practical. It is effective to set the ratio of the volume V2 to the volume V1 in the range of 40% to 70%, preferably in the range of 50% to 70%.

尚、前記インキタンク７と前記各々の連通管６とからなる空間の容積Ｖ１とは、インキタンク７内の容積と各々の連通管６内の容積とを合わせた容積をいう。前記インキ吸蔵体３の容積Ｖ２とは、ペン先２及び各々の連通管６のインキ吸蔵体３内に挿入される部分を除いたインキ吸蔵体３の容積をいう。 Note that the volume V1 of the space formed by the ink tank 7 and each of the communication pipes 6 is the total volume of the volume in the ink tank 7 and the volume in each of the communication pipes 6. The volume V2 of the ink occlusion body 3 refers to the volume of the ink occlusion body 3 excluding the pen tip 2 and the portion of each communication pipe 6 inserted into the ink occlusion body 3.

（構成１０）
本発明は、前記構成１乃至９のいずれかの直液式筆記具１において、前記連通管６の各々の前端近傍以外のインキ吸蔵体３の空隙率が７０％〜９５％であり、前記連通管６の各々の前端近傍以外のインキ吸蔵体３の空隙率と、前記連通管６の各々の前端近傍のインキ吸蔵体３の空隙率との差が７％以上（好ましくは１０％以上）であること（構成１０）を要件とする。 (Configuration 10)
According to the present invention, in the direct liquid writing instrument 1 having any one of the configurations 1 to 9, the porosity of the ink occlusion body 3 other than the vicinity of the front end of each of the communication pipes 6 is 70% to 95%. 6 is 7% or more (preferably 10% or more) between the porosity of the ink occlusion body 3 other than the vicinity of the front end of each of the ink pipes 6 and the porosity of the ink occlusion body 3 near the front end of each of the communication pipes 6. (Configuration 10) is a requirement.

前記直液式筆記具１（構成１０）において、前記連通管６の各々の前端近傍以外のインキ吸蔵体３の空隙率とは、連通管６の各々の前端近傍以外の密度を低く設定した部分（低密度部３２）のインキ吸蔵体３の空隙率であり、前記連通管６の各々の前端近傍のインキ吸蔵体３の空隙率とは、連通管６の各々の前端近傍の密度を高く設定した部分（高密度部３１）のインキ吸蔵体３の空隙率である。前記低密度部３２の空隙率を７０％〜９５％の範囲に設定し、且つ、前記低密度部３２の空隙率と高密度部３１の空隙率との差を７％以上に設定したことにより、一層、連通管６の各々の前端開口部を含浸インキによって、確実に液シールできる。 In the direct liquid writing instrument 1 (configuration 10), the porosity of the ink occlusion body 3 other than the vicinity of the front end of each of the communication pipes 6 is a portion where the density other than the vicinity of the front end of each of the communication pipes 6 is set low ( It is the porosity of the ink occlusion body 3 in the low density portion 32), and the porosity of the ink occlusion body 3 in the vicinity of each front end of the communication pipe 6 is set to a high density in the vicinity of each front end of the communication pipe 6. This is the porosity of the ink occlusion body 3 in the portion (high density portion 31). By setting the porosity of the low density portion 32 in the range of 70% to 95% and setting the difference between the porosity of the low density portion 32 and the porosity of the high density portion 31 to 7% or more. In addition, the front end opening of each communication pipe 6 can be liquid-sealed with impregnation ink.

（構成１１）
本発明は、前記構成１乃至１０のいずれかの直液式筆記具１において、前記インキ吸蔵体３の前端から前記連通管６の各々の前端までの軸方向の距離Ｓ１，Ｓ２が、前記インキ吸蔵体３全体の軸方向の長さの３％以上５０％以下（好ましくは３％以上３０％以下）に設定されること（構成１１）を要件とする。 (Configuration 11)
According to the present invention, in the direct liquid writing instrument 1 having any one of the configurations 1 to 10, the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 6 are the ink storage units. It is a requirement that the length of the entire body 3 is set to 3% to 50% (preferably 3% to 30%) of the axial length (Configuration 11).

前記直液式筆記具１（構成１１）は、インキタンク７の内圧上昇時にインキ吸蔵体３の前端よりインキが漏出することがなく、しかも、筆跡途切れや筆跡カスレのない、ペン先２先端からの十分なインキ流出性が得られる。もし、インキ吸蔵体３の前端からその後方に位置する連通管６の各々の前端までの軸方向の距離Ｓ１，Ｓ２がインキ吸蔵体３全体の軸方向の長さの３％未満であると、インキタンク７の内圧上昇時にインキ吸蔵体３の前端よりインキが漏出するおそれがある。また、もし、インキ吸蔵体３の前端からその後方に位置する連通管６の各々の前端までの軸方向の距離Ｓ１，Ｓ２がインキ吸蔵体３全体の軸方向の長さの５０％を越えると、連通管６の各々の前端からペン先２先端までの距離が長くなり、インキ流出性が阻害されるおそれがある。 The direct liquid type writing instrument 1 (configuration 11) does not leak ink from the front end of the ink occlusion body 3 when the internal pressure of the ink tank 7 increases, and further, there is no handwriting breakage or handwriting scraping. Sufficient ink outflow is obtained. If the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 6 positioned behind the ink storage body 3 are less than 3% of the axial length of the entire ink storage body 3, When the internal pressure of the ink tank 7 increases, the ink may leak out from the front end of the ink occlusion body 3. Further, if the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 6 positioned behind the ink storage body 3 exceed 50% of the overall length of the ink storage body 3 in the axial direction. The distance from the front end of each of the communication pipes 6 to the tip of the pen tip 2 becomes long, and there is a possibility that the ink outflow property is hindered.

(構成１２)
本発明は、前記構成１乃至１１のいずれかの直液式筆記具１において、前記インキ吸蔵体３の前端から前記連通管６の各々の前端までの軸方向の距離Ｓ１，Ｓ２が等しく設定されること（構成１２）を要件とする。 (Configuration 12)
According to the present invention, in the direct liquid writing instrument 1 having any one of the configurations 1 to 11, the axial distances S1 and S2 from the front end of the ink occlusion body 3 to the front ends of the communication pipes 6 are set equal. (Configuration 12) is a requirement.

前記直液式筆記具１（構成１２）は、インキ吸蔵体３の内部における連通管６の各々の前端の相互間の距離が一層短くなり、連通管６の各々の前端開口部の液シール性が向上し、外部へのインキ漏出を、より一層防止できる。 In the direct liquid writing instrument 1 (Configuration 12), the distance between the front ends of the communication pipes 6 in the ink storage body 3 is further shortened, and the liquid sealability of each front end opening of the communication pipe 6 is improved. This can further prevent ink leakage to the outside.

（構成１３)
本発明は、前記構成１乃至１２のいずれかの直液式筆記具１において、前記連通管６の各々の前端と前記ペン先２の後端との軸方向の距離Ｔ１，Ｔ２が１０ｍｍ（ミリメートル）以内に設定されること（構成１３）を要件とする。 (Configuration 13)
According to the present invention, in the direct liquid writing instrument 1 having any one of the configurations 1 to 12, axial distances T1 and T2 between the front end of each of the communication pipes 6 and the rear end of the nib 2 are 10 mm (millimeters). (Configuration 13) is a requirement.

前記直液式筆記具１（構成１３）は、初期インキ出し時、連通管６の各々の前端からペン先２の後端にインキが迅速に供給され、短時間で筆記可能となる。もし、連通管６の各々の前端とペン先２の後端との軸方向の距離Ｔ１，Ｔ２が１０ｍｍを越えると、連通管６の各々の前端とペン先２の後端との距離が大きくなり、連通管６の各々の前端からペン先２の後端への迅速なインキ供給できず、初期インキ出し時、筆記可能となるまでに相当の時間を要するおそれがある。尚、前記連通管６の各々の前端は、ペン先２の後端より前方に位置していてもよいし、あるいは、ペン先２の後端より後方に位置していてもよい。 In the direct liquid writing instrument 1 (configuration 13), ink is rapidly supplied from the front end of each of the communication pipes 6 to the rear end of the pen tip 2 at the time of initial ink discharge, and writing can be performed in a short time. If the axial distances T1 and T2 between the front ends of the communication pipes 6 and the rear end of the pen tip 2 exceed 10 mm, the distances between the front ends of the communication pipes 6 and the rear end of the pen tip 2 become large. Therefore, the ink cannot be supplied quickly from the front end of each of the communication pipes 6 to the rear end of the pen tip 2, and there is a possibility that a considerable time is required until writing becomes possible at the time of initial ink ejection. Note that the front end of each of the communication pipes 6 may be located in front of the rear end of the pen tip 2 or may be located in the rear of the rear end of the pen tip 2.

（構成１４）
本発明は、前記構成１乃至１３のいずれかの直液式筆記具１において、前記連通管６の各々の前端と前記ペン先２の後端との間の間隔が等しく設定されること（構成１４）を要件とする。 (Configuration 14)
According to the present invention, in the direct liquid writing instrument 1 according to any one of the configurations 1 to 13, the distance between the front end of each of the communication pipes 6 and the rear end of the nib 2 is set equal (configuration 14). ) As a requirement.

前記直液式筆記具１（構成１４）は、初期インキ出し時、インキタンク７からのインキが、複数本の連通管６の中で、いずれの連通管６の前端開口部からペン先２の後端に供給された場合でも、ばらつき無く、一定時間で筆記可能となる。 In the direct liquid writing instrument 1 (configuration 14), the ink from the ink tank 7 is discharged from the front end opening of any of the communication pipes 6 to the back of the pen tip 2 during the initial ink discharge. Even when supplied to the end, writing can be performed in a certain time without variation.

（構成１５）
本発明は、前記構成１乃至１４のいずれかの直液式筆記具１において、前記インキ吸蔵体３の前端面及びインキ吸蔵体３の後端面が外気と連通されること（構成１５）を要件とする。 (Configuration 15)
The present invention requires that the front end surface of the ink occlusion body 3 and the rear end surface of the ink occlusion body 3 communicate with the outside air in the direct liquid writing instrument 1 according to any one of the above configurations 1 to 14 (configuration 15). To do.

前記直液式筆記具１（構成１５）は、インキ吸蔵体３の内部の空気を、インキ吸蔵体３の前端面及びインキ吸蔵体３の後端面から逃がすことができる。それにより、インキ吸蔵体３の内部の連通管６の前端開口部から供給されたインキを、前記インキ吸蔵体３の内部の連通管６の前端近傍から、インキ吸蔵体３の前端方向、及び連通管６の前端近傍のインキ吸蔵体３の内部からインキ吸蔵体３の後端方向へスムーズに移動させることができる。特に、インキ吸蔵体３の後端面と外気が連通することにより、温度上昇等によるインキタンク７内の圧力上昇時、インキタンク７内から押し出されたインキが、スムーズに連通管６の前端よりインキ吸蔵体３の連通管６の前端近傍を介して後方へ移動し、インキ吸蔵体３の後方に含浸され、インキの外部への漏出を防ぎ、一方、温度低下等によるインキタンク７内の圧力減少時、インキ吸蔵体３の後方の含浸インキを、インキ吸蔵体３内部の連通管６の前端近傍を介して連通管６の前端開口部より連通管６内を通してインキタンク７内に戻すことができる。 The direct liquid writing instrument 1 (Configuration 15) can release the air inside the ink occlusion body 3 from the front end face of the ink occlusion body 3 and the rear end face of the ink occlusion body 3. As a result, the ink supplied from the front end opening of the communication pipe 6 inside the ink storage body 3 is passed from the vicinity of the front end of the communication pipe 6 inside the ink storage body 3 to the front end direction and the communication of the ink storage body 3. The ink occlusion body 3 in the vicinity of the front end of the tube 6 can be smoothly moved from the inside to the rear end direction of the ink occlusion body 3. In particular, when the pressure in the ink tank 7 rises due to a temperature rise or the like, the ink pushed out from the ink tank 7 smoothly passes through the front end of the communication pipe 6 when the rear end surface of the ink occlusion body 3 communicates with the outside air. It moves rearward through the vicinity of the front end of the communicating pipe 6 of the occlusion body 3 and is impregnated behind the ink occlusion body 3 to prevent leakage of the ink to the outside. At this time, the impregnated ink behind the ink storage body 3 can be returned to the ink tank 7 through the communication pipe 6 from the front end opening of the communication pipe 6 through the vicinity of the front end of the communication pipe 6 inside the ink storage body 3. .

（構成１６）
本発明は、前記構成１乃至１５のいずれかの直液式筆記具１において、前記連通管６の各々の内部に、毛細間隙を備えたインキ吸収体６３を配置したこと（構成１６）を要件とする。 (Configuration 16)
According to the present invention, in the direct liquid writing instrument 1 according to any one of the configurations 1 to 15, the ink absorber 63 having a capillary gap is disposed inside each of the communication pipes 6 (configuration 16). To do.

前記直液式筆記具１（構成１６）により、連通管６の折れ曲がりを抑えるために各々の連通管６の外径および内径を比較的大きく設定した場合でも、連通管６の前端開口部の適正な液シールが得られる。 Even when the outer diameter and the inner diameter of each communication pipe 6 are set to be relatively large in order to suppress the bending of the communication pipe 6 by the direct liquid writing instrument 1 (configuration 16), the front end opening of the communication pipe 6 is appropriately A liquid seal is obtained.

（構成１７）
本発明は、前記構成１乃至１６のいずれかの直液式筆記具１において、前記連通管６の各々の側壁を互いに連結したこと（構成１７）を要件とする。 (Configuration 17)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 16, the present invention requires that the side walls of the communication pipe 6 are connected to each other (configuration 17).

前記直液式筆記具１（構成１７）により、各々の連通管６の屈曲強度が向上し、各々の連通管６の折れ曲がりを抑えることができる。 With the direct liquid writing instrument 1 (Configuration 17), the bending strength of each communication pipe 6 is improved, and bending of each communication pipe 6 can be suppressed.

（連通管）
尚、本発明で、前記連通管６は、一定の剛性を備える点で、合成樹脂製または金属製であることが好ましい。また、前記連通管６の外周面及び内周面の横断面形状は、例えば、円形、楕円、または３角形、４角形等の多角形等、いずれであってもよい。また、前記連通管６の本数は、複数本（即ち２本以上）であればよく、例えば、２本、３本、４本、５本または６本等が挙げられる。 (Communication pipe)
In the present invention, the communication pipe 6 is preferably made of synthetic resin or metal in that it has a certain rigidity. Further, the cross-sectional shape of the outer peripheral surface and inner peripheral surface of the communication pipe 6 may be any of, for example, a circle, an ellipse, or a polygon such as a triangle or a quadrangle. Moreover, the number of the said communication pipe | tube 6 should just be two or more (namely, 2 or more), for example, 2, 3, 4, 5 or 6 etc. are mentioned.

また、前記連通管６の各々は、前後方向に延設され、その各々の内部に流通路６２が前後方向に貫設される。即ち、連通管６の各々は、両端（前端及び後端）に開口部を備える。 Each of the communication pipes 6 extends in the front-rear direction, and a flow passage 62 is provided through each of the communication pipes 6 in the front-rear direction. That is, each of the communication pipes 6 has openings at both ends (front end and rear end).

また、前記複数本の連通管６とは、その内部に独立した複数の流通路６２が並列に形成された構成であればよく、例えば、各々の連通管６が径方向に離隔した構成（図１乃至図５参照）、各々の連通管６の側壁が互いに連結した構成（図６乃至図８参照）、または大径の連通管６ａの内部に小径の連通管６ｂを配置した構成（図９参照）等が挙げられる。 Further, the plurality of communication pipes 6 may be configured so that a plurality of independent flow passages 62 are formed in parallel in the interior thereof. For example, the respective communication pipes 6 are separated in the radial direction (see FIG. 1 to FIG. 5), a configuration in which the side walls of the respective communication pipes 6 are connected to each other (see FIG. 6 to FIG. 8), or a structure in which a small diameter communication pipe 6b is disposed inside a large diameter communication pipe 6a (FIG. 9). For example).

また、前記連通管６の各々の前端は、ペン先２を中心とする同一円周上に等間隔に位置することが好ましい。また、前記連通管６の各々の前端は、軸方向前方に開口してもよいし、径方向外方に開口してもよい。前記連通管６の各々の前端の形状は、例えば、傾斜カット面、垂直面、円錐面、凸曲面等が挙げられる。前記連通管６の各々の後端は、軸方向後方に開口してもよいし、径方向外方に開口してもよい。 The front ends of the communication pipes 6 are preferably located at equal intervals on the same circumference with the nib 2 as the center. Further, the front end of each of the communication pipes 6 may be opened forward in the axial direction or may be opened outward in the radial direction. Examples of the shape of the front end of each communication pipe 6 include an inclined cut surface, a vertical surface, a conical surface, and a convex curved surface. The rear end of each of the communication pipes 6 may be opened rearward in the axial direction or may be opened radially outward.

また、前記連通管６の各々の後端は、隔壁５２後面より後方に突出するものでもよいが、少なくとも１本の連通管６ｂを隔壁５２後面より後方に大きく突出させるとともに、他の連通管６ａの後端を前記後方に突出する連通管６ｂの後端よりも前方に位置させる構成または他の連通管６ａの後端を隔壁５２後面より後方に突出させない構成（即ち連通管６ａの後端と隔壁５２の後面とを一致させる構成）が好ましい。 The rear end of each of the communication pipes 6 may protrude rearward from the rear surface of the partition wall 52, but at least one communication pipe 6b protrudes rearward from the rear surface of the partition wall 52 and other communication pipes 6a. A configuration in which the rear end of the rear end of the communication pipe 6b protrudes rearward from the rear end of the communication pipe 6b or a rear end of the other communication pipe 6a does not protrude rearward from the rear surface of the partition wall 52 (that is, the rear end of the communication pipe 6a A configuration in which the rear surface of the partition wall 52 is matched is preferable.

（インキ吸蔵体）
尚、本発明で、前記インキ吸蔵体３は、インキを含浸可能な連続気孔を有する部材（即ち多孔質材料）からなるものであればよく、例えば、繊維束の熱融着加工体、繊維束の樹脂加工体、フェルトの樹脂加工体、フェルトのニードルパンチ加工体、合成樹脂の連続気泡体等が挙げられる。また、前記インキ吸蔵体３は、その外周面に合成樹脂フィルム等よりなる外皮を備える構成でもよい。また、前記インキ吸蔵体３の内部前方とは、インキ吸蔵体３の前半部の内部のことである。前記インキ吸蔵体３は、単一の部材であってもよいし、毛細管力の異なる複数の部材であってもよい。 (Ink storage)
In the present invention, the ink occlusion body 3 may be made of a member having continuous pores that can be impregnated with ink (that is, a porous material). Resin processed body, felt resin processed body, felt needle punch processed body, synthetic resin open cell body, and the like. In addition, the ink occlusion body 3 may be configured to have an outer skin made of a synthetic resin film or the like on its outer peripheral surface. Further, the inside front of the ink occlusion body 3 refers to the inside of the front half of the ink occlusion body 3. The ink occlusion body 3 may be a single member or a plurality of members having different capillary forces.

（インキ吸蔵体の密度）
本発明で、前記インキ吸蔵体３の密度とは、繊維密度等の多孔質組織の密度である。インキ吸蔵体３の高密度部３１では、毛細間隙の間隙幅が小さくなり、インキ吸蔵体３の低密度部３２では、毛細間隙の間隙幅が大きくなる。それにより、前記高密度部３１の毛細管力は、前記低密度部３２の毛細管力よりも大きくなる。 (Ink storage density)
In the present invention, the density of the ink occlusion body 3 is a density of a porous structure such as a fiber density. In the high density portion 31 of the ink occlusion body 3, the gap width of the capillary gap is reduced, and in the low density portion 32 of the ink occlusion body 3, the gap width of the capillary gap is increased. Thereby, the capillary force of the high density portion 31 is larger than the capillary force of the low density portion 32.

（ペン先）
尚、本発明で、前記ペン先２は、例えば、繊維束の樹脂加工体、繊維束の熱融着加工体、フェルト加工体、パイプ状ペン体、先端にスリットを有する万年筆型板状ペン体、毛筆ペン体、合成樹脂の多孔質気泡体、ボールペンチップ、軸方向のインキ誘導路を有する合成樹脂の押出成形体等が挙げられる。また、前記ペン先２の後端を構成する材料は、少なくとも、インキ吸蔵体３との適正な接続を可能にするために毛細間隙を備えた部材であればよく、例えば、繊維束の樹脂加工体、繊維束の熱融着加工体、フェルト加工体、合成樹脂の多孔質気泡体等の多孔質材料、または軸方向のインキ誘導路を有する合成樹脂の押出成形体が挙げられる。尚、本発明で、前記ペン先２はインキ誘導部材を含む。 (Nib)
In the present invention, the nib 2 is, for example, a fiber bundle resin processed body, a fiber bundle heat fusion processed body, a felt processed body, a pipe-shaped pen body, and a fountain pen type plate-shaped pen body having a slit at the tip. A brush pen body, a porous foam of a synthetic resin, a ballpoint pen tip, an extruded body of a synthetic resin having an axial ink guide path, and the like. The material constituting the rear end of the nib 2 may be at least a member having a capillary gap in order to enable proper connection with the ink occlusion body 3, for example, resin processing of a fiber bundle. Examples thereof include a porous material such as a body, a heat-bonded processed body of fiber bundles, a felt processed body, and a porous foam of a synthetic resin, or an extruded body of a synthetic resin having an axial ink guide path. In the present invention, the nib 2 includes an ink guide member.

（インキ吸収体）
尚、前記インキ吸収体６３は、毛細間隙を備えるものであればよく、例えば、繊維束の樹脂加工体、繊維束の熱融着加工体、フェルト加工体、合成樹脂の多孔質気泡体等の多孔質材料、または軸方向のインキ誘導路を有する合成樹脂の押出成形体等が挙げられる。前記インキ吸収体６３の毛細管力は、インキ吸蔵体３内部の連通管６の各々の前端近傍部分（高密度部３１）の毛細管力よりも、小さく設定されることが好ましい。 (Ink absorber)
The ink absorber 63 only needs to have a capillary gap, such as a fiber bundle resin processed body, a fiber bundle heat-bonded processed body, a felt processed body, and a synthetic resin porous foam. Examples thereof include a porous material or an extruded product of a synthetic resin having an axial ink guide path. The capillary force of the ink absorber 63 is preferably set to be smaller than the capillary force of the vicinity of the front end (high density portion 31) of each of the communicating tubes 6 inside the ink storage member 3.

（隔壁）
前記隔壁５２は、インキ吸蔵体３とインキタンク７とを区画するものであり、実際には、インキタンクと、インキ吸蔵体３を収容する吸蔵体収容部とを区画するものである。前記隔壁５２の後面は、インキタンク７内に面する。 (Partition wall)
The partition wall 52 divides the ink occluding body 3 and the ink tank 7, and actually divides the ink tank and the occluding body accommodating portion for accommodating the ink occluding body 3. The rear surface of the partition wall 52 faces the ink tank 7.

（インキタンク）
前記インキタンク７は、例えば、筆記具本体に直接形成する構成（即ち、図１のようにインキタンク７が筆記具本体の一部を構成するもの）、または、筆記具本体内に収容する構成（図１３、図１６参照）が挙げられる。尚、本発明で、インキタンク７内に貯溜されるインキ８は、具体的には、筆記具用インキ（例えば、水性インキ、油性インキ）または塗布液（例えば、化粧液、修正液、接着剤、塗料、液体医薬品等）が挙げられる。 (Ink tank)
For example, the ink tank 7 is formed directly on the writing instrument body (that is, the ink tank 7 constitutes a part of the writing instrument body as shown in FIG. 1) or is housed in the writing instrument body (FIG. 13). FIG. 16). In the present invention, the ink 8 stored in the ink tank 7 specifically includes writing instrument ink (for example, water-based ink, oil-based ink) or coating liquid (for example, cosmetic liquid, correction liquid, adhesive, Paint, liquid medicine, etc.).

本発明は構成１により、インキタンク内のインキがペン先側より漏出するおそれがなく、しかも、初期インキ出し時に迅速に空気とインキが交替し、短時間で筆記可能となり、さらに、簡易な構造にでき、また、ペン先下向き状態で急激な圧力変化が生じても、ペン先側からのインキ漏出やインキ吹き出しを防止できる。 According to the present invention, the ink in the ink tank is not leaked from the pen tip side due to the configuration 1, and the air and the ink are quickly changed at the time of initial ink discharge, and writing can be performed in a short time. In addition, even if a sudden pressure change occurs in a state where the pen tip is downward, ink leakage or ink blowing from the pen tip side can be prevented.

本発明は構成２により、外部へのインキ漏出を、より一層防止できる。 According to the configuration 2, the present invention can further prevent ink leakage to the outside.

本発明は構成３により、初期インキ出し時、確実に、短時間で筆記可能となる。 According to the third aspect of the present invention, writing can be performed reliably in a short time when the initial ink is dispensed.

本発明は構成４により、筆跡途切れや筆跡カスレのない、ペン先からの円滑なインキ流出性が得られる。また、ペン先のコストを安価に抑えることもできる。また、インキが外部に漏出することを十分に防止できる。 According to the fourth aspect of the present invention, smooth ink outflow from the nib without any breaks in the handwriting or blurring of the handwriting can be obtained. In addition, the cost of the nib can be kept low. Further, the ink can be sufficiently prevented from leaking to the outside.

本発明は構成５により、ペン先上向き状態や筆記具本体の水平状態などのインキタンクからのインキ供給が無い場合でも、前記ペン先の後端と連通管の各々の前端との間のインキ吸蔵体内部に含浸されたインキによって十分に筆記可能となる。 According to the fifth aspect of the present invention, an ink occlusion body between the rear end of the pen tip and the front end of each of the communicating pipes even when there is no ink supply from the ink tank such as the pen tip upward state or the writing instrument body horizontal state. The ink impregnated inside can be sufficiently written.

本発明は構成６により、連通管の各々の前端開口部を含浸インキによって、確実に液シールでき、しかも、連通管をインキ吸蔵体に組み込む前に、予めインキ吸蔵体に密度差を設ける必要がなく、製造が極めて容易となる。 According to the present invention, the front end opening of each of the communication pipes can be reliably liquid-sealed with impregnated ink, and before the communication pipe is incorporated in the ink storage body, it is necessary to provide a density difference in the ink storage body in advance. And manufacturing is extremely easy.

本発明は構成７により、接続管をインキタンクの前端開口部に挿着した時、接続管が栓体を適正に押圧してインキタンクを確実に開栓でき、しかも、インキタンクの開栓時にインキタンク内のインキが外部に漏出するおそれがない。 According to the seventh aspect of the present invention, when the connecting pipe is inserted into the front end opening of the ink tank, the connecting pipe can press the stopper appropriately and the ink tank can be reliably opened, and when the ink tank is opened. There is no risk of the ink in the ink tank leaking outside.

本発明は構成８により、インキタンクの開栓時、栓体を適正に外すことができる。 According to the present invention, when the ink tank is opened, the stopper can be properly removed by the configuration 8.

本発明は構成９により、ペン先側より外部にインキが漏出したり吹き出したりすることを十分に防止できる。 According to the ninth aspect of the present invention, the ink can be sufficiently prevented from leaking out or blowing out from the pen tip side.

（第１の実施の形態）
本発明の第１の実施の形態の直液式筆記具１を図１乃至図２に示す。
本実施の形態の直液式筆記具１は、ペン先２と、前記ペン先２後端に接続されるインキ吸蔵体３と、前記ペン先２を前端部で保持し且つ前記インキ吸蔵体３を内部に収容する吸蔵体収容部と、前記吸蔵体収容部の後方に取り付けられ且つ内部にインキ８を直に貯溜するインキタンク７と、前記吸蔵体収容部と前記インキタンク７とを区画する隔壁５２と、前記隔壁５２の前面より前方に突出され、インキ吸蔵体３の内部に突き刺し接続される複数本（具体的には２本）の連通管６とからなる。前記吸蔵体収容部は、前記ペン先２を保持する先部材４と、前記先部材４と前記インキタンク７とを接続する中間部材５とからなる。 (First embodiment)
A direct liquid writing instrument 1 according to a first embodiment of the present invention is shown in FIGS.
The direct liquid writing instrument 1 of the present embodiment includes a pen tip 2, an ink occlusion body 3 connected to the rear end of the pen nib 2, the pen tip 2 held at the front end, and the ink occlusion body 3 An occlusion body accommodating portion that is accommodated inside, an ink tank 7 that is attached to the rear of the occlusion body accommodating portion and directly stores ink 8 therein, and a partition that partitions the occluded body accommodating portion and the ink tank 7 52 and a plurality of (specifically, two) communication pipes 6 that protrude forward from the front surface of the partition wall 52 and are pierced and connected to the inside of the ink storage body 3. The occlusion body housing portion includes a tip member 4 that holds the nib 2 and an intermediate member 5 that connects the tip member 4 and the ink tank 7.

・ペン先
前記ペン先２は、合成樹脂製繊維（例えば、ポリエステル繊維、アクリル繊維、ナイロン繊維等）の樹脂加工により得られる棒状体である。前記ペン先２の先端は、砲弾状に研削される。前記ペン先２の後端部外周面は、テーパ状に面取りされる。前記ペン先２の中間部は、環状溝２１が形成される。 Pen nib The nib 2 is a rod-like body obtained by resin processing of synthetic resin fibers (for example, polyester fibers, acrylic fibers, nylon fibers, etc.). The tip of the nib 2 is ground like a cannonball. The outer peripheral surface of the rear end portion of the nib 2 is chamfered in a tapered shape. An annular groove 21 is formed at the intermediate portion of the nib 2.

・インキ吸蔵体
前記インキ吸蔵体３は、円柱状の合成樹脂製繊維（例えば、ポリエステル繊維）の加工体よりなる。前記インキ吸蔵体３の外周面には、円筒状の外皮が被覆されている。前記外皮は、合成樹脂製フィルム（例えば、ポリエチレンテレフタレート製フィルム）よりなる。前記インキ吸蔵体３の前端面の軸心にペン先２の後端が突き刺し挿入され、前記ペン先２の後端が前記インキ吸蔵体３の内部前方に位置される。 Ink occlusion body The ink occlusion body 3 is made of a processed body of cylindrical synthetic resin fibers (for example, polyester fibers). The outer peripheral surface of the ink occlusion body 3 is covered with a cylindrical outer skin. The outer skin is made of a synthetic resin film (for example, a polyethylene terephthalate film). The rear end of the pen tip 2 is inserted into the axial center of the front end surface of the ink storage body 3 and the rear end of the pen tip 2 is positioned in front of the ink storage body 3.

・先部材
前記先部材４は、合成樹脂（例えば、ポリプロピレン、ポリエチレン等）の射出成形により得られる筒状体である。前記先部材４は、ペン先２外周面を保持する小径部４１と、該小径部４１より後方に連設され、インキ吸蔵体３の前部外周面を保持する大径部４２とからなる。 -Tip member The tip member 4 is a cylindrical body obtained by injection molding of synthetic resin (for example, polypropylene, polyethylene, etc.). The tip member 4 includes a small-diameter portion 41 that holds the outer peripheral surface of the nib 2 and a large-diameter portion 42 that is connected to the rear of the small-diameter portion 41 and holds the front outer peripheral surface of the ink occlusion body 3.

前記先部材４の内面（即ち小径部４１の内面から大径部４２の内面まで）には、前後方向に延びる複数本のリブ４３が一体に形成される。前記リブ４３には、前記先部材４の小径部４１と大径部４２との中間部において、段形状の規制壁部４３ａが形成される。前記規制壁部４３ａにインキ吸蔵体３の前端が軸方向に当接し、前記大径部４２の内面のリブ４３にインキ吸蔵体３の前部外周面が圧接保持される。前記リブ４３は、前記小径部４１内面において、係止凸部４３ｂが形成される。前記小径部４１内面において、リブ４３によりペン先２の外周面が径方向に圧接保持されるとともに、前記係止凸部４３ｂにペン先２外周面の環状溝２１が係合し、ペン先２の前後方向の移動が規制される。 A plurality of ribs 43 extending in the front-rear direction are integrally formed on the inner surface of the tip member 4 (that is, from the inner surface of the small diameter portion 41 to the inner surface of the large diameter portion 42). In the rib 43, a step-shaped regulation wall 43 a is formed at an intermediate portion between the small diameter portion 41 and the large diameter portion 42 of the tip member 4. The front end of the ink occlusion body 3 abuts against the restriction wall 43a in the axial direction, and the front outer peripheral surface of the ink occlusion body 3 is pressed and held by the rib 43 on the inner surface of the large diameter portion. The rib 43 is formed with a locking projection 43 b on the inner surface of the small diameter portion 41. On the inner surface of the small-diameter portion 41, the outer peripheral surface of the nib 2 is pressed and held in the radial direction by the rib 43, and the annular groove 21 on the outer peripheral surface of the nib 2 is engaged with the locking convex portion 43b. The movement in the front-rear direction is restricted.

前記リブ４３により、インキ吸蔵体３の前部外周面と大径部４２の内面との間、インキ吸蔵体３の前端面と先部材４の中間部内面との間、及びペン先２外周面と小径部４１内面との間に、空気通路１０が形成される。前記空気通路１０の前側は、先部材４の前端より外部に開口されるとともに、前記空気通路１０の後側は、インキ吸蔵体３の後端面と連通している。即ち、前記空気通路１０により、インキ吸蔵体３の前端面及びインキ吸蔵体３の後端面が、外気と連通される。 By the ribs 43, the space between the front outer peripheral surface of the ink occlusion body 3 and the inner surface of the large-diameter portion 42, the front end surface of the ink occlusion body 3 and the inner surface of the intermediate portion of the tip member 4, and the outer surface of the pen tip 2. And the air passage 10 is formed between the inner surface of the small-diameter portion 41. The front side of the air passage 10 is opened to the outside from the front end of the leading member 4, and the rear side of the air passage 10 is in communication with the rear end surface of the ink storage body 3. That is, the air passage 10 communicates the front end surface of the ink storage body 3 and the rear end surface of the ink storage body 3 with the outside air.

・中間部材
前記中間部材５は、合成樹脂（例えば、ポリプロピレン、ポリエチレン等）の射出成形より得られる筒状体である。前記中間部材５は、前方に開口する前方筒部５１と、該前方筒部５１の底部に形成される隔壁５２と、該隔壁５２から後方に延設され且つ後方に開口する後方筒部５３と、前記隔壁５２前面から軸方向前方に突出される複数（具体的には２本）の連通管６とが一体に連設されてなる。本実施の形態では、隔壁５２と連通管６とが一体に連設されているが、これ以外にも、別部材よりなる隔壁５２と連通管６とを固着させる構成でもよい。 Intermediate member The intermediate member 5 is a cylindrical body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 5 includes a front cylinder portion 51 opening forward, a partition wall 52 formed at the bottom of the front cylinder portion 51, a rear cylinder portion 53 extending rearward from the partition wall 52 and opening rearward. A plurality of (specifically, two) communication pipes 6 projecting forward in the axial direction from the front surface of the partition wall 52 are integrally connected. In the present embodiment, the partition wall 52 and the communication pipe 6 are integrally connected. However, in addition to this, the partition wall 52 and the communication pipe 6 made of different members may be fixed.

前記前方筒部５１の内周面には前記先部材４の大径部４２外周面が圧入固着される。前記前方筒部５１、隔壁５２、及び先部材４の大径部４２によって形成される空間（即ち吸蔵体収容部）に、インキ吸蔵体３が収容される。前記後方筒部５３にはインキタンク７の開口部が着脱自在に取り付けられる。具体的には、前記後方筒部５３にはインキタンク７の開口部が螺合により着脱自在に取り付けられる。 The outer peripheral surface of the large-diameter portion 42 of the tip member 4 is press-fitted and fixed to the inner peripheral surface of the front cylinder portion 51. The ink occlusion body 3 is accommodated in a space (that is, an occlusion body accommodation portion) formed by the front cylinder portion 51, the partition wall 52, and the large diameter portion 42 of the tip member 4. An opening of the ink tank 7 is detachably attached to the rear cylinder portion 53. Specifically, the opening of the ink tank 7 is detachably attached to the rear cylinder portion 53 by screwing.

前記隔壁５２と前記インキ吸蔵体３の後端面は非接触状態に維持され、前記隔壁５２と前記インキ吸蔵体３の後端面との間には、外気と連通する隙間９が形成される。前記隙間９は、前記空気通路１０を介して、外気と連通される。 The partition wall 52 and the rear end surface of the ink storage body 3 are maintained in a non-contact state, and a gap 9 communicating with outside air is formed between the partition wall 52 and the rear end surface of the ink storage body 3. The gap 9 is communicated with the outside air through the air passage 10.

・連通管
前記連通管６の各々の内部には、軸方向に流通路６２が設けられ、前記流通路６２が、前記連通管６の各々の両端にて開口される。前記連通管６の各々の前端は、インキ吸蔵体３の内部前方に開口され、前記連通管６の各々の後端は、インキ吸蔵体３後方のインキタンク７内に開口される。前記連通管６の各々の前端は軸線に対して垂直面である。前記複数本の連通管６において、１本の連通管６ｂが隔壁５２後面より後方に突出され且つその連通管６ｂの後端がインキタンク７内に位置され、一方、他の連通管６ａが隔壁５２後面より後方に突出されていない（即ち他の連通管６ａの後端が隔壁５２後面と一致している）。前記複数本の連通管６は、インキ吸蔵体３とインキタンク７との間に並列に配置されるため、インキ吸蔵体３と、その後方のインキタンク７との間に、独立した複数本の流通路６２が並列に設けられる。 -Communication pipe The flow path 62 is provided in the inside of each of the communication pipes 6 in the axial direction, and the flow paths 62 are opened at both ends of each of the communication pipes 6. The front ends of the communication pipes 6 are opened in front of the ink storage body 3, and the rear ends of the communication pipes 6 are opened in the ink tank 7 behind the ink storage body 3. The front end of each of the communication pipes 6 is a plane perpendicular to the axis. In the plurality of communication pipes 6, one communication pipe 6b protrudes rearward from the rear surface of the partition wall 52, and the rear end of the communication pipe 6b is positioned in the ink tank 7, while the other communication pipe 6a is connected to the partition wall. 52 does not protrude rearward from the rear surface (that is, the rear end of the other communication pipe 6a coincides with the rear surface of the partition wall 52). Since the plurality of communication pipes 6 are arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent pipes 6 are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. A flow passage 62 is provided in parallel.

前記連通管６の各々の前端は、インキ吸蔵体３の後端から前方に突き刺し挿入され、最後はインキ吸蔵体３の内部前方のペン先２後端近傍に位置される。前記連通管６の各々の前端がインキ吸蔵体３内に突き刺し挿入される際、連通管６の各々の前端がインキ吸蔵体３の繊維を前方に押圧圧縮する。それにより、各々の連通管６の前端近傍のインキ吸蔵体３の繊維密度が、連通管６の各々の前端近傍以外の部分のインキ吸蔵体３の繊維密度よりも高く設定される。即ち、インキ吸蔵体３内部に、繊維密度の高い高密度部３１（毛細管力の大きい高密度部３１）と、繊維密度の低い低密度部３２（毛細管力の小さい低密度部３２）が形成される。前記連通管６の各々の前端はインキ吸蔵体３の内部前方に位置しているため、インキ吸蔵体３の内部前方に前記高密度部３１が形成され、インキ吸蔵体３の内部後方に前記低密度部３２が形成される。前記各々の連通管６は、低密度部３２を後方から前方に貫通され、前記連通管６の各々の前端が低密度部３２より前方の高密度部３１の内部に位置される。尚、本実施の形態において、前記低密度部３２の空隙率（気孔率）は、８５％〜９３％に設定され、前記高密度部３１の空隙率は、前記低密度部３２の空隙率よりも低く設定され、前記低密度部３２の空隙率と前記高密度部３１の空隙率との差は、２０％に設定されている。 The front end of each of the communication pipes 6 is inserted forward by being inserted from the rear end of the ink storage body 3, and finally is positioned in the vicinity of the rear end of the pen tip 2 in front of the ink storage body 3. When the front ends of the communication pipes 6 are inserted into the ink storage body 3, the front ends of the communication pipes 6 press and compress the fibers of the ink storage body 3 forward. Thereby, the fiber density of the ink storage body 3 in the vicinity of the front end of each communication pipe 6 is set higher than the fiber density of the ink storage body 3 in a portion other than the vicinity of each front end of the communication pipe 6. That is, a high-density portion 31 having a high fiber density (a high-density portion 31 having a high capillary force) and a low-density portion 32 having a low fiber density (a low-density portion 32 having a low capillary force) are formed inside the ink occlusion body 3. The Since the front end of each of the communication pipes 6 is located in front of the ink storage body 3, the high density portion 31 is formed in front of the ink storage body 3, and A density portion 32 is formed. Each of the communication pipes 6 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 6 is positioned inside the high density part 31 ahead of the low density part 32. In the present embodiment, the porosity (porosity) of the low density portion 32 is set to 85% to 93%, and the porosity of the high density portion 31 is greater than the porosity of the low density portion 32. Also, the difference between the porosity of the low density portion 32 and the porosity of the high density portion 31 is set to 20%.

前記連通管６の各々の前端は、インキ吸蔵体３の軸心から径方向外方に離れた位置に配置される。詳細には、前記連通管６の各々の前端は、インキ吸蔵体３の軸心を中心とする同一円周上に等間隔で配置される。本実施の形態では、連通管６は２本であるので、前記連通管６はインキ吸蔵体３の軸心に対して１８０度対称位置に配置される。前記ペン先２がインキ吸蔵体３の軸心に位置しているので、前記連通管６の各々の前端は、ペン先２後端と直接接続されず、ペン先２と非接触状態にあり、インキ吸蔵体３の内部前方（高密度部３１）を介してインキ流通可能に接続される。また、前記連通管６の各々の前端は、ペン先２の後端より僅かに後方に位置している。即ち、前記インキ吸蔵体３の高密度部３１に、連通管６の各々の前端及びペン先２の後端が接続される。 The front end of each of the communication pipes 6 is disposed at a position that is radially outward from the axis of the ink storage body 3. Specifically, the front ends of the communication pipes 6 are arranged at equal intervals on the same circumference centered on the axis of the ink storage body 3. In the present embodiment, since there are two communication pipes 6, the communication pipes 6 are arranged at 180 ° symmetrical positions with respect to the axis of the ink occlusion body 3. Since the nib 2 is located at the axial center of the ink occlusion body 3, the front end of each of the communication pipes 6 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The ink occluding body 3 is connected through the inside front (high density portion 31) so that ink can be distributed. Further, the front end of each of the communication pipes 6 is located slightly behind the rear end of the pen tip 2. That is, the front end of each communicating pipe 6 and the rear end of the pen tip 2 are connected to the high density portion 31 of the ink occlusion body 3.

・軸方向の距離
尚、本実施の形態において、前記インキ吸蔵体３全体の軸方向の長さＬは、３０ｍｍに設定される。また、本実施の形態において、前記インキ吸蔵体３の前端から前記連通管６の各々の前端までの軸方向の距離Ｓ１，Ｓ２は、両者とも４ｍｍに設定される。よって、前記インキ吸蔵体３の前端から前記連通管６の各々の前端までの軸方向の距離Ｓ１，Ｓ２は、前記インキ吸蔵体３全体の軸方向の長さＬの１３．３％（即ち３％〜５０％の範囲内）である。また、本実施の形態において、前記連通管６の各々の前端と前記ペン先２の後端との軸方向の距離Ｔ１，Ｔ２は、両者とも１ｍｍ（即ち１０ｍｍ以内）に設定される。 In the present embodiment, the axial length L of the entire ink occlusion body 3 is set to 30 mm. In the present embodiment, the axial distances S1 and S2 from the front end of the ink occlusion body 3 to the front ends of the communication pipes 6 are both set to 4 mm. Therefore, the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 6 are 13.3% of the axial length L of the entire ink storage body 3 (that is, 3). % To 50%). In the present embodiment, the axial distances T1 and T2 between the front end of each of the communication pipes 6 and the rear end of the pen tip 2 are both set to 1 mm (that is, within 10 mm).

・インキタンク
前記インキタンク７は、前端が開口し後端が閉鎖された有底筒状体であり、合成樹脂の射出成形またはブロー成形により得られる。前記インキタンク７内には、直にインキ８が貯溜される。前記インキタンク７内に貯溜されるインキ８は、水性インキ、油性インキのいずれであってもよい。 Ink tank The ink tank 7 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding or blow molding of a synthetic resin. Ink 8 is stored directly in the ink tank 7. The ink 8 stored in the ink tank 7 may be either water-based ink or oil-based ink.

前記インキタンク７の前端開口部は、中間部材５と着脱自在に取り付けられる。前記インキタンク７のインキ８が消費され筆記不能となった場合、前記インキタンク７を中間部材５から取り外し、そのインキタンク７の内部にインキ８を充填した後、または、内部にインキ８が充填された新たなインキタンク７と交換した後、前記内部にインキ８が充填されたインキタンク７を中間部材５に取り付ける。それにより、再び、筆記可能となる。 The front end opening of the ink tank 7 is detachably attached to the intermediate member 5. When ink 8 in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the intermediate member 5 and the ink tank 7 is filled with the ink 8 or filled with the ink 8 After the new ink tank 7 is replaced, the ink tank 7 filled with the ink 8 is attached to the intermediate member 5. Thereby, writing becomes possible again.

本実施の形態では、前記インキ吸蔵体３の容積Ｖ２は、前記インキタンク７と前記各々の連通管６とからなる空間の容積Ｖ１の５０％〜７０％に設定されている。 In the present embodiment, the volume V2 of the ink occlusion body 3 is set to 50% to 70% of the volume V1 of the space formed by the ink tank 7 and the communication pipes 6.

また、本実施の形態の直液式筆記具１は、ペン先２側に着脱自在のキャップ（図示せず）を備える。前記キャップをペン先２側に装着することにより、ペン先２及び空気通路１０の前端開口部が密封され、インキタンク７と外気との連通が遮断される。 Further, the direct liquid writing instrument 1 of the present embodiment includes a detachable cap (not shown) on the pen tip 2 side. By mounting the cap on the pen tip 2 side, the pen tip 2 and the front end opening of the air passage 10 are sealed, and the communication between the ink tank 7 and the outside air is blocked.

（第２の実施の形態）
図３に本発明の第２の実施の形態を示す。
本実施の形態は、第１の実施の形態の変形例であり、第１の実施の形態と異なる点はペン先２の前端がチゼル形状を有する点、及び連通管６と隔壁５２とが別部材によりなる点である。 (Second Embodiment)
FIG. 3 shows a second embodiment of the present invention.
This embodiment is a modification of the first embodiment. The difference from the first embodiment is that the front end of the nib 2 has a chisel shape, and the communication pipe 6 and the partition wall 52 are different. This is a point made up of members.

前記隔壁５２には、前後方向に二つの取付孔５２ａが貫設される。前記各々の取付孔５２ａに連通管６が圧入固着される。また、前記隔壁５２の前面には、前記取付孔５２ａが前方に開口される環状凸部５２ｂ（当接壁部）が一体に形成される。前記環状凸部５２ｂと前記インキ吸蔵体３の後端面とが当接され、前記インキ吸蔵体３の後端面と隔壁５２との間に、前記環状凸部５２ｂの突出寸法に応じた隙間９が適正に形成される。また、前記インキ吸蔵体３の前端面が規制壁部４３ａに当接され、且つ、前記インキ吸蔵体３の後端面が前記環状凸部５２ｂにより当接される構成のため、インキ吸蔵体３の前後方向のガタツキを防止できる。尚、前記以外の点は、第１の実施の形態と同様の構成であるため説明を省略する。 The partition wall 52 is provided with two mounting holes 52a extending in the front-rear direction. The communication pipe 6 is press-fitted and fixed to each of the mounting holes 52a. An annular convex portion 52b (abutting wall portion) in which the mounting hole 52a is opened forward is integrally formed on the front surface of the partition wall 52. The annular convex portion 52b and the rear end surface of the ink storage body 3 are brought into contact with each other, and a gap 9 corresponding to the projecting dimension of the annular convex portion 52b is formed between the rear end surface of the ink storage body 3 and the partition wall 52. Properly formed. Further, since the front end surface of the ink occlusion body 3 is in contact with the regulating wall 43a and the rear end surface of the ink occlusion body 3 is in contact with the annular convex portion 52b, Backlash in the front-rear direction can be prevented. Since the configuration other than the above is the same as that of the first embodiment, description thereof is omitted.

（第３の実施の形態）
図４に本発明の第３の実施の形態を示す。
本実施の形態は、第１の実施の形態の変形例であり、ペン先２がボールペンチップよりなる。前記ペン先２は、先端に回転可能にボール２２を抱持するホルダー２３と、該ホルダー２３内に挿着されるインキ誘導部材２４とからなる。前記インキ誘導部材２４は、棒状の合成樹脂製繊維の樹脂加工体からなり、その後端が、インキ吸蔵体３の前端より突き刺し挿入され、インキ吸蔵体３の内部前方に位置されている。また、先部材４の小径部４１側壁には、空気孔４４が穿設される。前記空気孔４４により、外気と先部材４内の空気通路１０とが連通される。 (Third embodiment)
FIG. 4 shows a third embodiment of the present invention.
The present embodiment is a modification of the first embodiment, and the pen tip 2 is made of a ballpoint pen tip. The nib 2 includes a holder 23 that holds a ball 22 rotatably at the tip, and an ink guide member 24 that is inserted into the holder 23. The ink guide member 24 is made of a resin processed body made of a rod-shaped synthetic resin fiber, and its rear end is inserted and inserted from the front end of the ink storage body 3, and is positioned in front of the ink storage body 3. An air hole 44 is formed in the side wall of the small diameter portion 41 of the tip member 4. The air hole 44 allows the outside air to communicate with the air passage 10 in the tip member 4.

前記連通管６の各々は、前端が一つの傾斜カット面６１からなり、先鋭化される。それにより、各々の連通管６のインキ吸蔵体３への突き刺し挿入性が向上し、各々の連通管６の前端開口部の開口面積が増加し、インキ吸蔵体３内部へのインキの供給を迅速にできる。前記連通管６の各々の前端の傾斜カット面６１は、連通管６の各々の前端開口部を含むよう形成される。前記傾斜カット面６１（即ち連通管６の前端開口部）は、インキ吸蔵体３の軸心方向（即ちペン先２後端方向）に向いている。それにより、インキをペン先２後端に迅速に供給できるとともに、連通管６の前端によってペン先２後端近傍の繊維がペン先２後端方向に向かって押圧圧縮され、ペン先２後端近傍の繊維密度を容易に高く設定できる。本実施の形態では、前記連通管６の各々の外面及び内面の横断面は円形状であり、前記連通管６の各々の前端の外周縁及び内周縁は、傾斜カット面６１により、楕円形状となっている。尚、前記以外の構成は、第１の実施の形態と同様の構成であるため説明を省略する。 Each of the communication pipes 6 has a front end formed of one inclined cut surface 61 and is sharpened. Thereby, the piercing insertion property of each communication pipe 6 into the ink storage body 3 is improved, the opening area of the front end opening of each communication pipe 6 is increased, and the ink supply into the ink storage body 3 is quickly performed. Can be. The inclined cut surface 61 at the front end of each of the communication pipes 6 is formed to include the front end opening of each of the communication pipes 6. The inclined cut surface 61 (that is, the front end opening of the communication pipe 6) faces the axial direction of the ink storage body 3 (that is, the rear end direction of the pen tip 2). As a result, ink can be quickly supplied to the rear end of the nib 2, and the fibers near the rear end of the nib 2 are pressed and compressed toward the rear end of the nib 2 by the front end of the communication pipe 6. The fiber density in the vicinity can be easily set high. In the present embodiment, the cross section of each outer surface and inner surface of the communication pipe 6 is circular, and the outer peripheral edge and inner peripheral edge of each front end of the communication pipe 6 are formed into an elliptical shape by the inclined cut surface 61. It has become. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

（第４の実施の形態）
図５に本発明の第４の実施の形態を示す。
本実施の形態は、第１の実施の形態の変形例であり、第１の実施の形態と異なる点は、繊維加工体よりなるインキ吸収体６３を各々の連通管６の流通路６２内に収容した点である。前記インキ吸収体６３の繊維密度（毛細管力）は、インキ吸蔵体３の高密度部３１の繊維密度（毛細管力）よりも小さく設定される。前記インキ吸収体６３を連通管６に収容したことによって、連通管６の外径及び内径を比較的大きく設定しても、連通管６の前端開口部を適正に液シールすることができる。その結果、連通管６の外径及び内径を太く設定でき、連通管６の折れ曲がり防止に有利となる。尚、前記以外の構成は、第１の実施の形態と同様の構成であるため説明を省略する。 (Fourth embodiment)
FIG. 5 shows a fourth embodiment of the present invention.
This embodiment is a modification of the first embodiment, and is different from the first embodiment in that an ink absorber 63 made of a fiber processed body is placed in the flow passage 62 of each communication pipe 6. It is the point which accommodated. The fiber density (capillary force) of the ink absorber 63 is set smaller than the fiber density (capillary force) of the high density portion 31 of the ink occlusion body 3. By accommodating the ink absorber 63 in the communication pipe 6, the front end opening of the communication pipe 6 can be properly liquid-sealed even if the outer diameter and inner diameter of the communication pipe 6 are set to be relatively large. As a result, the outer diameter and inner diameter of the communication pipe 6 can be set thick, which is advantageous for preventing the communication pipe 6 from being bent. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

（第５の実施の形態）
図６及び図７に本発明の第５の実施の形態を示す。
本実施の形態は、第１の実施の形態の変形例であり、第１の実施の形態と異なる点は、連通管６の各々の前端が傾斜カット面６１からなる点（第３の実施の形態と同様の構成）と、各々の連通管６の側壁を軸方向に延びる板状リブ６４により互いに一体に連結した点である。前記各々の連通管６の側壁を軸方向に延びる板状リブ６４により互いに一体に連結した構成により、各々の連通管６の屈曲強度が向上し、インキ吸蔵体３への安定した突き刺し挿入が得られる。尚、前記以外の構成は、第１の実施の形態と同様の構成であるため説明を省略する。 (Fifth embodiment)
6 and 7 show a fifth embodiment of the present invention.
The present embodiment is a modification of the first embodiment, and is different from the first embodiment in that each front end of the communication pipe 6 includes an inclined cut surface 61 (third embodiment). And the side wall of each communication pipe 6 are integrally connected to each other by a plate-like rib 64 extending in the axial direction. By the structure in which the side walls of the respective communication pipes 6 are integrally connected to each other by the plate-like ribs 64 extending in the axial direction, the bending strength of the respective communication pipes 6 is improved, and stable piercing insertion into the ink storage body 3 is obtained. It is done. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

図８に他の連通管６の例を示す。
これは、連通管６の各々の側壁を互いに連結した別の例である。即ち、この例では、１本の筒状体の内部を長手方向に延びる仕切壁により区画した構成、あるいは、別の言い方をすれば、横断面半月状の２本の連通管６ａ，６ｂを横断面円形状になるように一体に連結した構成である。それにより、筒状体の内部に横断面半月状の２本の流通路６２が独立して並列に設けられる。 FIG. 8 shows another example of the communication pipe 6.
This is another example in which the side walls of the communication pipe 6 are connected to each other. In other words, in this example, the inside of one cylindrical body is partitioned by a partition wall extending in the longitudinal direction, or in other words, crosses the two communication pipes 6a and 6b having a semicircular cross section. It is the structure connected integrally so that it may become a surface circle shape. As a result, two flow passages 62 having a half-moon cross section are independently provided in parallel inside the cylindrical body.

図９に他の連通管６の例を示す。
これは、大径の連通管６ａの内部に小径の連通管６ｂを配置した構成の例である。この例では、大径の連通管６ａの内周面と小径の連通管６ｂの外周面との間に横断面環状の流通路６２が形成され、小径の連通管６ｂの内部に横断面円形状の流通路６２が形成される。前記大径の連通管６ａの後端は隔壁５２後面より後方に突出されず、前記小径の連通管６ｂの後端が隔壁５２後面より後方に突出されインキタンク７内に位置される。 FIG. 9 shows another example of the communication pipe 6.
This is an example of a configuration in which a small-diameter communication pipe 6b is disposed inside a large-diameter communication pipe 6a. In this example, an annular flow passage 62 is formed between the inner peripheral surface of the large-diameter communication pipe 6a and the outer peripheral surface of the small-diameter communication pipe 6b, and a circular cross-section is formed inside the small-diameter communication pipe 6b. The flow path 62 is formed. The rear end of the large-diameter communication pipe 6 a does not protrude rearward from the rear surface of the partition wall 52, and the rear end of the small-diameter communication pipe 6 b protrudes rearward from the rear surface of the partition wall 52 and is positioned in the ink tank 7.

（第６の実施の形態）
図１０に第６の実施の形態を示す。
本実施の形態は、第１の実施の形態の変形例であり、第１の実施の形態と異なる点は、インキタンク７内に突出する連通管６ｂが、隔壁５２と一体に形成され且つ隔壁５２前面より前方に突出する第１の管状部材と、隔壁５２後面より後方に突出する第２の管状部材の２部品からなる点にある。前記第２の管状部材は、隔壁５２に圧入固着され、第１の管状部材と連通可能に接続される。尚、前記以外の構成は、第１の実施の形態と同様の構成であるため説明を省略する。 (Sixth embodiment)
FIG. 10 shows a sixth embodiment.
This embodiment is a modification of the first embodiment, and is different from the first embodiment in that the communication pipe 6b protruding into the ink tank 7 is formed integrally with the partition wall 52 and the partition wall. 52 is composed of two parts: a first tubular member projecting forward from the front surface of the wall 52 and a second tubular member projecting rearward from the rear surface of the partition wall 52. The second tubular member is press-fitted and fixed to the partition wall 52, and is connected to be able to communicate with the first tubular member. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

（第７の実施の形態）
図１１に第７の実施の形態を示す。
本実施の形態は、第１の実施の形態の変形例であり、第１の実施の形態と異なる点は、連通管６の各々の前端が、軸方向前方に開口せず、複数の窓孔６５により径方向外方に開口している点にある。尚、前記以外の構成は、第１の実施の形態と同様の構成であるため説明を省略する。 (Seventh embodiment)
FIG. 11 shows a seventh embodiment.
This embodiment is a modification of the first embodiment, and is different from the first embodiment in that the front ends of the communication pipes 6 do not open forward in the axial direction, and a plurality of window holes are provided. It is in the point opened to radial direction outward by 65. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

（第８の実施の形態）
図１２に第８の実施の形態を示す。
本実施の形態は、第１の実施の形態の変形例であり、第１の実施の形態と異なる点は、インキ吸蔵体３の軸心の貫通孔にペン先２の後部が圧入され、ペン先２の後端がインキ吸蔵体３の内部後方（インキ吸蔵体３の後半部の内部）に位置している点にある。尚、前記以外の構成は、第１の実施の形態と同様の構成であるため説明を省略する。 (Eighth embodiment)
FIG. 12 shows an eighth embodiment.
The present embodiment is a modification of the first embodiment, and is different from the first embodiment in that the rear part of the pen tip 2 is press-fitted into the through-hole of the shaft center of the ink occlusion body 3, and the pen The rear end of the tip 2 is located behind the interior of the ink storage body 3 (in the latter half of the ink storage body 3). Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

（第９の実施の形態）
本発明の第９の実施の形態の直液式筆記具１を図１３乃至図１５に示す。
本実施の形態の直液式筆記具１は、ペン先２と、前記ペン先２後端に接続されるインキ吸蔵体３と、前記インキ吸蔵体３の後方に配置される中間部材５と、前記中間部材５の後方に配置されるインキタンク７と、前端部で前記ペン先２を保持し且つ内部に前記インキ吸蔵体３、前記中間部材５、及び前記インキタンク７を収容する軸筒１１と、前記軸筒１１の後端開口部に着脱自在に螺着される尾栓１２と、ペン先２側に着脱自在に設けられるキャップ１３とからなる。 (Ninth embodiment)
A direct liquid writing instrument 1 according to a ninth embodiment of the present invention is shown in FIGS.
The direct liquid writing instrument 1 according to the present embodiment includes a nib 2, an ink occlusion body 3 connected to the rear end of the nib 2, an intermediate member 5 disposed behind the ink occlusion body 3, and the An ink tank 7 disposed behind the intermediate member 5, and a shaft cylinder 11 that holds the pen tip 2 at the front end and accommodates the ink occlusion body 3, the intermediate member 5, and the ink tank 7 therein. The tail plug 12 is detachably screwed into the rear end opening of the shaft tube 11 and the cap 13 is detachably provided on the pen tip 2 side.

・ペン先
前記ペン先２は、合成樹脂製繊維（例えば、ポリエステル繊維、アクリル繊維、ナイロン繊維等）の樹脂加工により得られる棒状体である。前記ペン先２の前端は、砲弾状に研削される。前記ペン先２の後端部外周面は、テーパ状に面取りされる。 Pen nib The nib 2 is a rod-like body obtained by resin processing of synthetic resin fibers (for example, polyester fibers, acrylic fibers, nylon fibers, etc.). The front end of the nib 2 is ground like a bullet. The outer peripheral surface of the rear end portion of the nib 2 is chamfered in a tapered shape.

・インキ吸蔵体
前記インキ吸蔵体３は、円柱状の合成樹脂製繊維（例えば、ポリエステル繊維）の加工体よりなる。前記インキ吸蔵体３の外周面には、円筒状の外皮が被覆されている。前記外皮は、合成樹脂製フィルム（例えば、ポリエチレンテレフタレート製フィルム）よりなる。前記インキ吸蔵体３の前端面の軸心にペン先２の後端が突き刺し挿入され、前記ペン先２の後端が前記インキ吸蔵体３の内部前方に位置される。 Ink occlusion body The ink occlusion body 3 is made of a processed body of cylindrical synthetic resin fibers (for example, polyester fibers). The outer peripheral surface of the ink occlusion body 3 is covered with a cylindrical outer skin. The outer skin is made of a synthetic resin film (for example, a polyethylene terephthalate film). The rear end of the pen tip 2 is inserted into the axial center of the front end surface of the ink storage body 3 and the rear end of the pen tip 2 is positioned in front of the ink storage body 3.

・軸筒
前記軸筒１１は、合成樹脂（例えば、ポリプロピレン、ポリエチレン等）の射出成形により得られる筒状体である。前記軸筒１１は、ペン先２外周面を保持する先細部１１１と、該先細部１１１より後方に連設され、インキ吸蔵体３及び隔壁５２及びインキタンク７が収容される本体部１１２とからなる。 -Shaft tube The shaft tube 11 is a tubular body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The shaft cylinder 11 includes a tip 111 that holds the outer peripheral surface of the nib 2, and a main body 112 that is connected to the rear of the tip 111 and that accommodates the ink storage body 3, the partition wall 52, and the ink tank 7. Become.

前記軸筒１１の内面（即ち先細部１１１の内面から本体部１１２の前部内面まで）には、前後方向に延びる複数本のリブ１１３が一体に形成される。前記リブ１１３には、前記軸筒１１の先細部１１１と本体部１１２との接続部の近傍において、段形状の規制壁部１１３ａが形成される。前記規制壁部１１３ａにインキ吸蔵体３の前端面が軸方向に当接し、前記本体部１１２の前部内面のリブ１１３にインキ吸蔵体３の外周面が圧接保持される。前記先細部１１１内面のリブ１１３により、ペン先２の外周面が圧接保持される。前記リブ１１３の、前記ペン先２外周面を保持する箇所と、前記インキ吸蔵体３外周面を保持する箇所との間に、筒状壁部１１３ｂが一体に形成される。 A plurality of ribs 113 extending in the front-rear direction are integrally formed on the inner surface of the shaft cylinder 11 (that is, from the inner surface of the tapered portion 111 to the inner surface of the front portion of the main body portion 112). In the rib 113, a step-shaped regulation wall portion 113 a is formed in the vicinity of the connection portion between the tapered portion 111 of the shaft tube 11 and the main body portion 112. The front end surface of the ink occlusion body 3 abuts against the restriction wall portion 113a in the axial direction, and the outer peripheral surface of the ink occlusion body 3 is pressed and held by the rib 113 on the inner surface of the front portion of the main body portion 112. The outer peripheral surface of the nib 2 is pressed and held by the rib 113 on the inner surface of the tapered portion 111. A cylindrical wall portion 113b is integrally formed between a portion of the rib 113 that holds the outer peripheral surface of the pen nib 2 and a portion that holds the outer peripheral surface of the ink occlusion body 3.

前記リブ１１３により、インキ吸蔵体３の外周面と本体部１１２の内面との間、インキ吸蔵体３の前端面と軸筒１１内面との間、及びペン先２外周面と先細部１１１内面との間に、空気通路１０が形成される。前記空気通路１０の前側は、軸筒１１の前端より外部に開口されるとともに、前記空気通路１０の後側は、インキ吸蔵体３の後端面と連通している。即ち、前記空気通路１０により、インキ吸蔵体３の前端面及びインキ吸蔵体３の後端面が、外気と連通される。 By the rib 113, between the outer peripheral surface of the ink occlusion body 3 and the inner surface of the main body portion 112, between the front end surface of the ink occlusion body 3 and the inner surface of the shaft cylinder 11, and between the outer peripheral surface of the pen tip 2 and the inner surface of the taper 111. In between, the air passage 10 is formed. The front side of the air passage 10 is opened to the outside from the front end of the shaft cylinder 11, and the rear side of the air passage 10 communicates with the rear end surface of the ink occlusion body 3. That is, the air passage 10 communicates the front end surface of the ink storage body 3 and the rear end surface of the ink storage body 3 with the outside air.

・中間部材
前記中間部材５は、合成樹脂（例えば、ポリプロピレン、ポリエチレン等）の射出成形により得られる。前記中間部材５は、前記インキ吸蔵体３とインキタンク７とを区画する隔壁５２と、前記隔壁５２の前面より前方に突出され且つインキ吸蔵体３の内部に突き刺し接続される複数本（具体的には２本）の連通管６と、前記隔壁５２の後面より後方に突出され且つインキタンク７の前端開口部に挿着される接続管５４と、前記隔壁５２の前面または後面より軸方向に突出し且つ軸筒１１内面（本体部１１２内面）に固着される取付筒部５５とを備える。軸筒１１及び隔壁５２によって形成される空間（即ち吸蔵体収容部）に、インキ吸蔵体３が収容される。前記取付筒部５５は、隔壁５２前方の各々の連通管６の基部外周または接続管５４外周を包囲している。前記接続管５４後端には切り欠きが形成される。前記切り欠きにより、前記接続管５４後端には栓体７１の片側を押圧するための突片５４ａが一体に形成される。前記隔壁５２は円板状であり、前記各々の連通管６、前記接続管５４、前記取付筒部５５は、円筒状である。前記突片５４ａは、横断面形状が円弧状である。 Intermediate member The intermediate member 5 is obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 5 includes a partition wall 52 that partitions the ink storage body 3 and the ink tank 7, and a plurality of intermediate members that protrude forward from the front surface of the partition wall 52 and are pierced and connected to the inside of the ink storage body 3 (specifically 2) communication pipes 6, a connecting pipe 54 that protrudes rearward from the rear surface of the partition wall 52 and is inserted into the front end opening of the ink tank 7, and an axial direction from the front surface or rear surface of the partition wall 52. And a mounting tube portion 55 that protrudes and is fixed to the inner surface of the shaft tube 11 (the inner surface of the main body portion 112). The ink occlusion body 3 is accommodated in a space (that is, the occlusion body accommodation portion) formed by the shaft cylinder 11 and the partition wall 52. The mounting cylinder portion 55 surrounds the outer periphery of the base portion of each communication pipe 6 or the outer periphery of the connection pipe 54 in front of the partition wall 52. A notch is formed at the rear end of the connection pipe 54. Due to the notch, a protruding piece 54a for pressing one side of the plug 71 is integrally formed at the rear end of the connecting pipe 54. The partition wall 52 has a disk shape, and each of the communication pipe 6, the connection pipe 54, and the attachment cylinder portion 55 has a cylindrical shape. The projecting piece 54a has a circular cross-sectional shape.

前記隔壁５２、各々の連通管６（即ち連通管６ａ，連通管６ｂ）、接続管５４、及び取付筒部５５は一体に連設される。即ち、中間部材５により、隔壁５２、連通管６、接続管５４、及び取付筒部５５を１部品で構成できる。 The partition wall 52, the respective communication pipes 6 (that is, the communication pipe 6a and the communication pipe 6b), the connection pipe 54, and the mounting cylinder portion 55 are integrally connected. That is, the intermediate member 5 allows the partition wall 52, the communication pipe 6, the connection pipe 54, and the mounting cylinder portion 55 to be configured as one part.

・当接壁部
図１５（１）に示すように、隔壁５２の前面には、板状のリブよりなる当接壁部５２ｂが一体に形成される。前記当接壁部５２ｂがインキ吸蔵体３の後端面と当接される。前記当接壁部５２ｂにより、前記隔壁５２と前記インキ吸蔵体３の後端面との間には、外気と連通する隙間９が形成される。前記隙間９は、前記空気通路１０を介して、外気と連通される。前記当接壁部５２ｂの一部は各々の連通管６の基部の間に形成され、各々の連通管６の基部側壁が連結される。それにより、各々の連通管６の屈曲強度が向上し、各々の連通管６の隔壁５２に対する折れ曲がりを抑えることができる。前記当接壁部５２ｂは、横断面が、枝分かれ状、放射状、または十字状に形成される。 Abutting wall portion As shown in FIG. 15 (1), an abutting wall portion 52 b made of a plate-like rib is integrally formed on the front surface of the partition wall 52. The abutting wall portion 52b is brought into contact with the rear end surface of the ink storage member 3. A gap 9 communicating with the outside air is formed between the partition wall 52 and the rear end surface of the ink occluding body 3 by the contact wall portion 52b. The gap 9 is communicated with the outside air through the air passage 10. A part of the abutting wall portion 52b is formed between the base portions of the communication pipes 6, and the base side walls of the communication pipes 6 are connected. Thereby, the bending strength of each communication pipe 6 is improved, and the bending of each communication pipe 6 with respect to the partition wall 52 can be suppressed. The abutting wall portion 52b is formed in a branched shape, a radial shape, or a cross shape in cross section.

・連通管
前記連通管６の各々の内部には、軸方向に流通路６２が設けられ、前記流通路６２が、前記連通管６の各々の両端にて開口される。前記連通管６の各々の前端は、インキ吸蔵体３の内部に位置し且つインキ吸蔵体３の内部前方に開口される。前記連通管６の各々の後端は、インキ吸蔵体３後方のインキタンク７内に開口される。前記複数本の連通管６において、１本の連通管６ｂが隔壁５２後面より後方に突出され、且つ、その連通管６ｂの後端がインキタンク７内（接続管５４内）に位置され、一方、他の連通管６ａが隔壁５２後面より後方に突出されていない（即ち他の連通管６ａの後端が隔壁５２後面と一致している）。前記各々の連通管６は、インキ吸蔵体３とインキタンク７との間に並列に配置されるため、インキ吸蔵体３と、その後方のインキタンク７との間に、独立した複数本の流通路６２が並列に設けられる。前記連通管６の各々の流通路６２は、接続管５４内に位置する隔壁５２の、軸心より離れた箇所に貫通される。 -Communication pipe The flow path 62 is provided in the inside of each of the communication pipes 6 in the axial direction, and the flow paths 62 are opened at both ends of each of the communication pipes 6. The front end of each of the communication pipes 6 is located inside the ink storage body 3 and is opened in front of the ink storage body 3. The rear end of each of the communication pipes 6 is opened in the ink tank 7 behind the ink storage body 3. In the plurality of communication pipes 6, one communication pipe 6b protrudes rearward from the rear surface of the partition wall 52, and the rear end of the communication pipe 6b is located in the ink tank 7 (in the connection pipe 54). The other communication pipe 6a does not protrude rearward from the rear surface of the partition wall 52 (that is, the rear end of the other communication pipe 6a coincides with the rear surface of the partition wall 52). Since each of the communication pipes 6 is arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent circulations are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. A path 62 is provided in parallel. Each flow passage 62 of the communication pipe 6 is penetrated to a location away from the axis of the partition wall 52 located in the connection pipe 54.

前記隔壁５２後面から後方に突出する連通管６ｂの後端の前後方向の位置は、接続管５４の後端（即ち突片５４ａの後端）と略一致しているか、または接続管５４の後端（即ち突片５４ａの後端）より僅かに前方に位置される。即ち、前記隔壁５２後面から後方に突出する連通管６ｂの後端が接続管５４の後端（即ち突片５４ａの後端）から後方に大きく突出されていない。また、前記隔壁５２後面から後方に突出する連通管６ｂは、突片５４ａ内面に近接して配置される。具体的には、前記隔壁５２後面から後方に突出する連通管６ｂは、接続管５４の軸心と突片５４ａ内面との間に配置される。 The position in the front-rear direction of the rear end of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 substantially coincides with the rear end of the connection pipe 54 (that is, the rear end of the projecting piece 54a) or the rear of the connection pipe 54. It is positioned slightly forward from the end (that is, the rear end of the protruding piece 54a). That is, the rear end of the communication pipe 6b that protrudes rearward from the rear surface of the partition wall 52 is not greatly protruded rearward from the rear end of the connection pipe 54 (that is, the rear end of the protruding piece 54a). Further, the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 is disposed close to the inner surface of the protruding piece 54a. Specifically, the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 is disposed between the axial center of the connection pipe 54 and the inner surface of the protruding piece 54a.

前記連通管６の各々の前端は、インキ吸蔵体３の後端から前方に突き刺し挿入され、最後はインキ吸蔵体３の内部のペン先２後端近傍に位置される。前記連通管６の各々の前端がインキ吸蔵体３内に突き刺し挿入される際、連通管６の各々の前端がインキ吸蔵体３の繊維を前方に押圧圧縮する。それにより、各々の連通管６の前端近傍のインキ吸蔵体３の繊維密度が、連通管６の各々の前端近傍以外の部分のインキ吸蔵体３の繊維密度よりも高く設定される。即ち、インキ吸蔵体３内部に、繊維密度の高い高密度部３１（毛細管力の大きい高密度部３１）と、繊維密度の低い低密度部３２（毛細管力の小さい低密度部３２）が形成される。インキ吸蔵体３の内部前方には前記高密度部３１が形成され、前記高密度部３１の後方に前記低密度部３２が形成される。前記高密度部３１と前記低密度部３２とは連接される。前記各々の連通管６は、低密度部３２を後方から前方に貫通され、前記連通管６の各々の前端が低密度部３２より前方の高密度部３１の内部に位置される。尚、本実施の形態において、前記低密度部３２の空隙率（気孔率）は、８５％〜９３％に設定され、前記高密度部３１の空隙率は、前記低密度部３２の空隙率よりも低く設定され、前記低密度部３２の空隙率と前記高密度部３１の空隙率との差は、２０％に設定されている。 The front end of each of the communication pipes 6 is inserted forward from the rear end of the ink storage body 3 and is finally positioned near the rear end of the pen tip 2 inside the ink storage body 3. When the front ends of the communication pipes 6 are inserted into the ink storage body 3, the front ends of the communication pipes 6 press and compress the fibers of the ink storage body 3 forward. Thereby, the fiber density of the ink storage body 3 in the vicinity of the front end of each communication pipe 6 is set higher than the fiber density of the ink storage body 3 in a portion other than the vicinity of each front end of the communication pipe 6. That is, a high-density portion 31 having a high fiber density (a high-density portion 31 having a high capillary force) and a low-density portion 32 having a low fiber density (a low-density portion 32 having a low capillary force) are formed inside the ink occlusion body 3. The The high density portion 31 is formed in front of the ink occlusion body 3, and the low density portion 32 is formed behind the high density portion 31. The high density portion 31 and the low density portion 32 are connected. Each of the communication pipes 6 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 6 is positioned inside the high density part 31 ahead of the low density part 32. In the present embodiment, the porosity (porosity) of the low density portion 32 is set to 85% to 93%, and the porosity of the high density portion 31 is greater than the porosity of the low density portion 32. Also, the difference between the porosity of the low density portion 32 and the porosity of the high density portion 31 is set to 20%.

前記連通管６の各々の前端は、インキ吸蔵体３の軸心から径方向外方に離れた位置に配置される。詳細には、前記連通管６の各々の前端は、インキ吸蔵体３の軸心を中心とする同一円周上に等間隔で配置される。本実施の形態では、連通管６は２本であるので、前記連通管６はインキ吸蔵体３の軸心に対して１８０度対称位置に配置される。前記ペン先２がインキ吸蔵体３の軸心に位置しているので、前記連通管６の各々の前端は、ペン先２後端と直接接続されず、ペン先２と非接触状態にあり、インキ吸蔵体３の内部前方（高密度部３１）を介してインキ流通可能に接続される。また、前記連通管６の各々の前端は、ペン先２の後端より僅かに後方に位置している。 The front end of each of the communication pipes 6 is disposed at a position that is radially outward from the axis of the ink storage body 3. Specifically, the front ends of the communication pipes 6 are arranged at equal intervals on the same circumference centered on the axis of the ink storage body 3. In the present embodiment, since there are two communication pipes 6, the communication pipes 6 are arranged at 180 ° symmetrical positions with respect to the axis of the ink occlusion body 3. Since the nib 2 is located at the axial center of the ink occlusion body 3, the front end of each of the communication pipes 6 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The ink occluding body 3 is connected through the inside front (high density portion 31) so that ink can be distributed. Further, the front end of each of the communication pipes 6 is located slightly behind the rear end of the pen tip 2.

・軸方向の距離
尚、本実施の形態において、前記インキ吸蔵体３全体の軸方向の長さは、２８ｍｍに設定される。また、本実施の形態において、前記インキ吸蔵体３の前端から前記連通管６の各々の前端までの軸方向の距離Ｓ１，Ｓ２は、両者とも１４ｍｍに設定される。また、本実施の形態において、前記連通管６の各々の前端と前記ペン先２の後端との軸方向の距離Ｔ１，Ｔ２は、両者とも３ｍｍ（即ち１０ｍｍ以内）に設定される。 -Axial distance In the present embodiment, the axial length of the entire ink occlusion body 3 is set to 28 mm. In the present embodiment, the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 6 are both set to 14 mm. In the present embodiment, axial distances T1 and T2 between the front end of each of the communication pipes 6 and the rear end of the pen tip 2 are both set to 3 mm (ie, within 10 mm).

・インキタンク
前記インキタンク７は、前端が開口し後端が閉鎖された有底筒状体であり、合成樹脂の射出成形またはブロー成形により得られる。前記インキタンク７内には、直にインキ８が貯溜される。前記インキタンク７内に貯溜されるインキ８は、水性インキ、油性インキのいずれであってもよい。 Ink tank The ink tank 7 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding or blow molding of a synthetic resin. Ink 8 is stored directly in the ink tank 7. The ink 8 stored in the ink tank 7 may be either water-based ink or oil-based ink.

前記インキタンク７の前端開口部内面には、中間部材５の接続管５４外面が着脱自在に嵌着される。前記インキタンク７のインキ８が消費され筆記不能となった場合、前記インキタンク７を接続管５４から取り外し、内部にインキ８が充填された新たなインキタンク７の前端開口部に接続管５４を挿着する。それにより、再び、筆記可能となる。前記新たなインキタンク７の前端開口部は、栓体７１により閉鎖されている。具体的には、インキタンク７の前端開口部内面に栓体７１が嵌着されている。接続管５４をインキタンク７の前端開口部に挿着した際、前記栓体７１の片側を接続管５４の突片５４ａにより後方に押圧し、栓体７１を外し、インキタンク７の前端開口部が開栓される。ここでは、前記栓体７１として、合成樹脂の射出成形体よりなる円板状の栓体７１が採用される。尚、前記円板状の栓体７１の代わりに球状の栓体を採用することもできる。 The outer surface of the connecting pipe 54 of the intermediate member 5 is detachably fitted to the inner surface of the front end opening of the ink tank 7. When ink 8 in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the connection pipe 54, and the connection pipe 54 is installed in the front end opening of a new ink tank 7 filled with the ink 8 inside. Insert it. Thereby, writing becomes possible again. A front end opening of the new ink tank 7 is closed by a plug 71. Specifically, a plug 71 is fitted on the inner surface of the front end opening of the ink tank 7. When the connection pipe 54 is inserted into the front end opening of the ink tank 7, one side of the plug body 71 is pressed backward by the protruding piece 54 a of the connection pipe 54, the plug body 71 is removed, and the front end opening of the ink tank 7 is removed. Is opened. Here, as the plug body 71, a disk-shaped plug body 71 made of an injection molded body of synthetic resin is employed. A spherical plug can be used instead of the disk-shaped plug 71.

本実施の形態では、前記インキ吸蔵体３の容積Ｖ２は、前記インキタンク７と前記各々の連通管６とからなる空間の容積Ｖ１の５０％〜７０％に設定されている。 In the present embodiment, the volume V2 of the ink occlusion body 3 is set to 50% to 70% of the volume V1 of the space formed by the ink tank 7 and the communication pipes 6.

・キャップ
前記キャップ１３は、ペン先２側に着脱自在に設けられる。前記キャップ１３をペン先２側に装着することにより、ペン先２及び空気通路１０の前端開口部が密封され、インキタンク内と外気との連通が遮断される。 Cap The cap 13 is detachably provided on the pen tip 2 side. By attaching the cap 13 to the pen tip 2 side, the pen tip 2 and the front end opening of the air passage 10 are sealed, and the communication between the ink tank and the outside air is blocked.

（第１０の実施の形態）
本発明の第１０の実施の形態の直液式筆記具１を図１６乃至図１８に示す。
本実施の形態は、第９の実施の形態の変形例であり、第９の実施の形態と異なる点は、連通管６の各々の内面（具体的には軸方向前方に開口する連通管６の各々の前端開口部の内面）に、流量規制部６６（具体的には環状突出部）を設けた点にある。前記流量規制部６６により、ペン先下向き状態で急激な圧力変化が生じた場合、インキタンク７内のインキ８が外部に吹き出すことを一層抑えることができる。尚、前記以外の構成は、第９の実施の形態と同様の構成であるため説明を省略する。 (Tenth embodiment)
A direct liquid writing instrument 1 according to a tenth embodiment of the present invention is shown in FIGS.
This embodiment is a modification of the ninth embodiment, and is different from the ninth embodiment in that each inner surface of the communication pipe 6 (specifically, the communication pipe 6 that opens axially forward). The flow regulating portion 66 (specifically, an annular protrusion) is provided on the inner surface of each front end opening. The flow rate restricting unit 66 can further suppress the ink 8 in the ink tank 7 from being blown to the outside when a sudden pressure change occurs in the pen tip downward state. Since the configuration other than the above is the same as that of the ninth embodiment, the description thereof is omitted.

本発明の第１の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 1st Embodiment of this invention. 図１のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 本発明の第２の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 2nd Embodiment of this invention. 本発明の第３の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 3rd Embodiment of this invention. 本発明の第４の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 4th Embodiment of this invention. 本発明の第５の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 5th Embodiment of this invention. 図６のＢ−Ｂ線断面図である。It is the BB sectional view taken on the line of FIG. 他の連通管の例を示す横断面図である。It is a cross-sectional view showing an example of another communication pipe. 他の連通管の例を示す横断面図である。It is a cross-sectional view showing an example of another communication pipe. 本発明の第６の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 6th Embodiment of this invention. 本発明の第７の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 7th Embodiment of this invention. 本発明の第８の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 8th Embodiment of this invention. 本発明の第９の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 9th Embodiment of this invention. （１）が図１３のＣ−Ｃ線拡大断面図、（２）が図１３のＤ−Ｄ線拡大断面図、（３）が図１３のＥ−Ｅ線拡大断面図である。(1) is an enlarged sectional view taken along line CC in FIG. 13, (2) is an enlarged sectional view taken along line DD in FIG. 13, and (3) is an enlarged sectional view taken along line EE in FIG. （１）が図１３のＦ−Ｆ線拡大断面図、（２）が図１３のＧ−Ｇ線拡大断面図である。(1) is the FF line expanded sectional view of FIG. 13, (2) is the GG line expanded sectional view of FIG. 本発明の第１０の実施の形態のペン先下向き状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the pen tip downward state of the 10th Embodiment of this invention. （１）が図１６のＨ−Ｈ線拡大断面図、（２）が図１６のＩ−Ｉ線拡大断面図、（３）が図１６のＪ−Ｊ線拡大断面図である。(1) is the HH line expanded sectional view of FIG. 16, (2) is the II line expanded sectional view of FIG. 16, (3) is the JJ line expanded sectional view of FIG. （１）が図１６のＫ−Ｋ線拡大断面図、（２）が図１６のＬ−Ｌ線拡大断面図である。(1) is the KK line expanded sectional view of FIG. 16, (2) is the LL line expanded sectional view of FIG.

符号の説明Explanation of symbols

１ 直液式筆記具
２ ペン先
２１ 環状溝
２２ ボール
２３ ホルダー
２４ インキ誘導部材
３ インキ吸蔵体
３１ 高密度部
３２ 低密度部
４ 先部材
４１ 小径部
４２ 大径部
４３ リブ
４３ａ 規制壁部
４３ｂ 係止凸部
４４ 空気孔
５ 中間部材
５１ 前方筒部
５２ 隔壁
５２ａ 取付孔
５２ｂ 環状凸部（当接壁部）
５３ 後方筒部
５４ 接続管
５４ａ 突片
５５ 取付筒部
６ 連通管
６１ 傾斜カット面
６２ 流通路
６３ インキ吸収体
６４ リブ
６５ 窓孔
６６ 流量規制部
６ａ 連通管
６ｂ 連通管
７ インキタンク
７１ 栓体
８ インキ
９ 隙間
１０ 空気通路
１１ 軸筒
１１１ 先細部
１１２ 本体部
１１３ リブ
１１３ａ 規制壁部
１１３ｂ 筒状壁部
１２ 尾栓
１３ キャップ
Ｌ インキ吸蔵体全体の軸方向の長さ
Ｓ１，Ｓ２ インキ吸蔵体の前端から連通管の前端までの軸方向の距離
Ｔ１，Ｔ２ 連通管の前端とペン先の後端との軸方向の距離 DESCRIPTION OF SYMBOLS 1 Direct liquid type writing instrument 2 Pen tip 21 Annular groove 22 Ball 23 Holder 24 Ink guide member 3 Ink occlusion body 31 High density part 32 Low density part 4 Tip member 41 Small diameter part 42 Large diameter part 43 Rib 43a Restriction wall part 43b Locking Convex part 44 Air hole 5 Intermediate member 51 Front cylinder part 52 Partition 52a Mounting hole 52b Annular convex part (contact wall part)
53 Rear cylinder part 54 Connection pipe 54a Projection piece 55 Mounting cylinder part 6 Communication pipe 61 Inclined cut surface 62 Flow path 63 Ink absorber 64 Rib 65 Window hole 66 Flow rate regulating part 6a Communication pipe 6b Communication pipe 7 Ink tank 71 Plug body 8 Ink 9 Clearance 10 Air passage 11 Shaft cylinder 111 Tapered 112 Main body 113 Rib 113a Restriction wall 113b Cylindrical wall 12 Tail plug 13 Cap L Length in the axial direction of the entire ink occlusion body S1, S2 Front end of ink occlusion body Axial distance T1, T2 from the front end of the communication pipe to the front end of the communication pipe Axial distance between the front end of the communication pipe and the rear end of the nib

Claims (5)

ペン先と、前記ペン先の後端に接続されるインキ吸蔵体と、前記インキ吸蔵体の後方に配置され、インキを直に貯溜するインキタンクと、前記インキタンクと前記インキ吸蔵体との間を接続する連通管とからなる直液式筆記具であって、前記連通管を複数備え、インキ吸蔵体とインキタンクとの間に隔壁を設け、前記隔壁前面より前方に前記連通管の各々を突出させ、前記連通管の各々の前端をインキ吸蔵体内部に位置させ、少なくとも１本の連通管を前記隔壁後面より後方に突出させ、その連通管の後端をインキタンク内部に位置させ、前記連通管の各々の前端がインキ吸蔵体内部のペン先後端近傍に位置されてなることを特徴とする直液式筆記具。 A pen tip, an ink occlusion body connected to the rear end of the pen nib, an ink tank that is disposed behind the ink occlusion body and directly stores ink, and between the ink tank and the ink occlusion body A direct liquid type writing instrument comprising a plurality of communication pipes, each having a plurality of communication pipes, provided with a partition wall between an ink storage body and an ink tank, and projecting each of the communication pipes forward from the front surface of the partition wall. is, the front end of each of the communicating pipe is located inside the ink occlusion body, at least one communicating tube is protruded backward from the partition wall rear, the rear end of the communicating pipe is positioned inside the ink tank, the communication A direct liquid writing instrument, wherein the front end of each of the tubes is positioned in the vicinity of the rear end of the nib inside the ink occlusion body . ペン先と、前記ペン先の後端に接続されるインキ吸蔵体と、前記インキ吸蔵体の後方に配置され、インキを直に貯溜するインキタンクと、前記インキタンクと前記インキ吸蔵体との間を接続する連通管とからなる直液式筆記具であって、前記連通管を複数備え、インキ吸蔵体とインキタンクとの間に隔壁を設け、前記隔壁前面より前方に前記連通管の各々を突出させ、前記連通管の各々の前端をインキ吸蔵体内部に位置させ、少なくとも１本の連通管を前記隔壁後面より後方に突出させ、その連通管の後端をインキタンク内部に位置させ、前記連通管の各々の前端が前記インキ吸蔵体の内部前方に位置し、前記ペン先の後端が前記インキ吸蔵体の内部前方に位置してなることを特徴とする直液式筆記具。 A pen tip, an ink occlusion body connected to the rear end of the pen nib, an ink tank that is disposed behind the ink occlusion body and directly stores ink, and between the ink tank and the ink occlusion body A direct liquid type writing instrument comprising a plurality of communication pipes, each having a plurality of communication pipes, provided with a partition wall between an ink storage body and an ink tank, and projecting each of the communication pipes forward from the front surface of the partition wall. And the front end of each of the communication pipes is positioned inside the ink storage body, at least one communication pipe protrudes rearward from the rear surface of the partition wall, and the rear end of the communication pipe is positioned inside the ink tank. A direct liquid type writing instrument , wherein a front end of each of the tubes is positioned in front of the ink storage body and a rear end of the pen tip is positioned in front of the ink storage body . ペン先と、前記ペン先の後端に接続されるインキ吸蔵体と、前記インキ吸蔵体の後方に配置され、インキを直に貯溜するインキタンクと、前記インキタンクと前記インキ吸蔵体との間を接続する連通管とからなる直液式筆記具であって、前記連通管を複数備え、インキ吸蔵体とインキタンクとの間に隔壁を設け、前記隔壁前面より前方に前記連通管の各々を突出させ、前記連通管の各々の前端をインキ吸蔵体内部に位置させ、少なくとも１本の連通管を前記隔壁後面より後方に突出させ、その連通管の後端をインキタンク内部に位置させ、前記連通管の各々の前端がインキ吸蔵体内部のペン先後端近傍に位置され、前記連通管の各々の前端が前記インキ吸蔵体の内部前方に位置し、前記ペン先の後端が前記インキ吸蔵体の内部前方に位置してなることを特徴とする直液式筆記具。 A pen tip, an ink occlusion body connected to the rear end of the pen nib, an ink tank that is disposed behind the ink occlusion body and directly stores ink, and between the ink tank and the ink occlusion body A direct liquid type writing instrument comprising a plurality of communication pipes, each having a plurality of communication pipes, provided with a partition wall between an ink storage body and an ink tank, and projecting each of the communication pipes forward from the front surface of the partition wall. And the front end of each of the communication pipes is positioned inside the ink storage body, at least one communication pipe protrudes rearward from the rear surface of the partition wall, and the rear end of the communication pipe is positioned inside the ink tank. The front end of each of the tubes is positioned in the vicinity of the rear end of the pen tip inside the ink storage body, the front end of each of the communication tubes is positioned in front of the interior of the ink storage member, and the rear end of the pen tip is connected to the ink storage member. Located inside the front Direct liquid type writing instrument according to claim Rukoto. 開栓前のインキタンクの前端開口部を栓体によって閉鎖し、前記隔壁後面より後方に接続管を突出させ、前記接続管を前記インキタンクの前端開口部内に挿着し、前記接続管が前記栓体を押圧することによって前記インキタンクを開栓してなり、前記隔壁後面より後方に突出された連通管が前記接続管の内側に位置し、前記隔壁後面より後方に突出された連通管の後端が前記接続管の後端より前方に位置するかまたは前記隔壁後面より後方に突出された連通管の後端と前記接続管の後端との軸方向の位置が略一致してなる請求項１乃至３のいずれかに記載の直液式筆記具。 The front end opening of the ink tank before opening is closed with a plug, the connecting pipe protrudes behind the rear surface of the partition wall, the connecting pipe is inserted into the front end opening of the ink tank, and the connecting pipe is The ink tank is opened by pressing a plug, and a communication pipe protruding rearward from the rear surface of the partition wall is located inside the connection pipe, and a communication pipe protruding rearward from the rear surface of the partition wall. The rear end of the connecting pipe is located in front of the rear end of the connection pipe, or the rear end of the communication pipe protruding rearward from the rear surface of the partition wall is substantially coincident with the rear end of the connection pipe. Item 4. The direct liquid writing instrument according to any one of Items 1 to 3 . インキタンクの開栓時に前記栓体の片側を押圧する突片を前記接続管後端の片側に設け、前記隔壁後面より後方に突出された連通管の外面と前記突片の内面とを近接させてなる請求項４記載の直液式筆記具。 A projecting piece that presses one side of the plug body when the ink tank is opened is provided on one side of the rear end of the connecting pipe, and the outer surface of the communication pipe projecting rearward from the rear surface of the partition wall is brought close to the inner surface of the projecting piece. The direct liquid writing instrument according to claim 4 .
JP2007055244A 2006-03-09 2007-03-06 Direct liquid writing instrument Active JP5085960B2 (en)

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JPS4518890Y1 (en) * 1966-04-25 1970-08-01
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JPS58192082U (en) * 1982-06-17 1983-12-20 株式会社寿 writing implements
JPS6069690U (en) * 1983-10-21 1985-05-17 セーラー万年筆株式会社 Cartridge ink refill type writing instrument

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