JP4521898B2

JP4521898B2 - Liquid applicator

Info

Publication number: JP4521898B2
Application number: JP23947199A
Authority: JP
Inventors: 伸之中島; 賢二佐藤; 茂樹大場
Original assignee: Mitsubishi Pencil Co Ltd
Current assignee: Mitsubishi Pencil Co Ltd
Priority date: 1999-08-26
Filing date: 1999-08-26
Publication date: 2010-08-11
Anticipated expiration: 2019-08-26
Also published as: JP2001063277A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えばサインペン等の筆記用具あるいは眉描き筆等の化粧具などの液体塗布具に関し、更に詳しくは、ペン芯へのインク（インキともいう）の供給が安定して行えるようにしたカートリッジ交換式の液体塗布具に関する。
【０００２】
【従来の技術】
従来、塗布具、例えば筆記具として用いられるサインペンにおいては、例えば、実開平６−４５７７６号公報に開示されているように、インクをカートリッジ交換可能にした構成を有するものがある。
【０００３】
この種のカートリッジ交換式筆記具では、図８に示すように、軸筒本体１００を先軸１０１と、この先軸１０１に分離可能に螺合されて装着される後軸１０２とで形成され、先軸１０１内を隔壁１０３を介して先端筒部１０４と後端筒部１０５とに区画されている。
【０００４】
そして、先軸１０１の後端筒部１０５内の中心軸には、筒状突起１０６が設けられ、この筒状突起１０６には、インクＷを収容した交換可能なカートリッジ４００の先端部が着脱自在に装填され、カートリッジ４００の先端開口部側に設けたシールボール受部４０１を介して密栓するシールボール４０２の密栓解除により、カートリッジ４００内のインクＷを筒状突起１０６の連通孔１０７に導入させるようになっている。
【０００５】
また、先軸１０１の先端筒部１０４の先端には、シール筒１０８が設けられ、このシール筒１０８を介してコレクタ２００が先端筒部１０４内に挿入されている。このコレクタ２００は、先端筒部１０４の内周面１０４ａとの間に外気と連通可能に遊嵌状態で保持されていて、その中心軸には、筒状突起１０６の連通孔１０７に対接して連通する連通孔２０１が設けられている。
【０００６】
さらに、コレクタ２００の先端側の口プラ（ホルダー）２００ａには、ペン芯２０２が連通孔２０１の先端部位に差込み保持されるようになっているもので、コレクタ２００の後端面２００ｂは、先軸１０１内の隔壁１０３に当接させてなるとともに、連通孔２０１に挿入された中継芯２０３の先端部２０３ａをペン芯２０２に接合させてなる一方、中継芯２０３の後端部２０３ｂを先軸１０１の後端筒部１０５側に形成した筒状突起１０６の連通孔１０７側に跨って間隙Ａを持たせて遊嵌状態で挿入することで、筒状突起１０６の連通孔１０７を介してコレクタ２００の連通孔２０１側に導入されるカートリッジ４００内のインクＷを中継心２０３を介してペン芯２０２側に浸透供給している。
【０００７】
さらにまた、コレクタ２００の外周胴部には、インク保留部３００が設けられていて、このインク保留部３００は、軸方向に所望の間隔Ｄを存して櫛歯状に配置された複数枚の翼状保留板３０１からなり、これら各々の翼状保留板３０１間に跨って外気と連通可能なインクスリット３０２を軸方向に設けていると共に、このインクスリット３０２のコレクタ後端面２００ｂ側の開口端３０２ａを筒状突起１０６の連通孔１０７に間隙Ｂを持たせて連通させるようになっている。
【０００８】
すなわち、この間隙Ｂは、コレクタ２００の外周胴部に形成されたインクスリット３０２と、筒状突起１０６の連通孔１０７とを連通させることにより、例えば、筆記時に軸筒本体１００を握持する手指の体温等による温度上昇にてカートリッジ４００に作用する内圧変化を吸収し、このような内圧変化に伴って溢出しようとする過剰インクＷを一時的に保留可能し、これにより、先端筒部１０４の先端側からのインクＷの溢出を防止するようになっている。
【０００９】
【発明が解決しようとする課題】
ところで、筆記具において、コレクタのインクスリットがインク貯蔵部（カートリッジ）から流出してくるインクに直接接しているタイプの筆記具においては、インクスリットの寸法が空気とインクの置換のバランスを取る上で重要な要素となるが、上記筆記具のように先軸の筒状突起（１０６）がカートリッジに嵌合し、インクに直接接する隙間が中継芯と筒状突起内周面とで形成される間隙Ａを持つ筆記具の場合には、その間隙Ａとインク物性、特に粘度との関係で筆記性能が決定される。
【００１０】
前記間隙Ａはコレクタ内の空気とカートリッジ（インク貯蔵部）内のインクとの置換場所になり、その置換のしやすさは間隙の寸法によって決まる。
通常の筆記時には、ペン芯からインクが紙などの筆記対象に移り、カートリッジのインクは中継芯を経由してペン芯に供給される。カートリッジのインクが中継芯の毛細管力により引かれて移動することにより該カートリッジ内部は減圧状態になり、間隙Ａによりインクとコレクタより侵入した空気が置換し、カートリッジ内に空気が入ってその減圧状態が解消し、また、設計した正常なインクの筆記時流出量が決まる。
【００１１】
しかしながら、間隙Ａが狭い場合、隙間Ａで空気とインクとの置換が困難となり、置換するのにカートリッジの減圧が極端に大きくならなければ置換が起こらず、カートリッジの減圧状態が解消されない場合、減圧の程度が大きくなり、カートリッジ内のインクが中継芯の毛細管力により引き出されるのを妨げ、筆記描線が薄くなりカスレ等の筆記不良が生じる。又、インクの粘度が高い場合には、筆記時の空気置換のスピードが遅くなることによりカスレを生じる。
【００１２】
一方、間隙Ａは、空気置換の働きと同時に、ペン芯下向きのときに間隙Ａにインクと空気の界面ができることにより、その表面張力で筆記時にインクがペン芯からたれ落ちることを防ぎ、筆記流量の増加やインクのペン芯からの漏れ（直流）を防いで安定させる。
【００１３】
しかるに、間隙Ａの寸法が大きい場合には、空気とインクの置換は容易に行われので、筆記使用時にカスレ等の筆記不良は生じないが、例えばキャップをつけて下向き状態にし５０°Ｃで７日間の直流試験でインクがペン芯から漏れるか否かの評価を行うと、温度の上昇によりインクの表面張力が下がり間隙Ａでインクを保持できる力が弱くなり、インクがペン芯から漏れるすなわち直流が発生する。
【００１４】
本発明は、上記の問題点に鑑みてなされたもので、インキや化粧品等の塗布液体にカスレや直流の塗布不良が生じることを確実に防止して、安定した液体塗布性能を得ることができるようにした塗布具を提供することを目的する。
【００１５】
【課題を解決するための手段】
上記した課題を解決するために、本発明は、次の構成を有する。
本発明は、軸筒本体を先軸と、該先軸に分離可能に装着される後軸とで形成し、
前記軸筒本体の先軸内を隔壁を介して先端筒部と後端筒部とに区画し、
前記先軸内の隔壁の先端筒部側の面を周縁部より中央部の凹んだ段付き凹面部に形成し、
外周胴部に軸方向にそれぞれ間隔（Ｄ）を置いて配置された複数枚の保溜板に軸方向に前記各々の保留板間にわたって所定幅（Ｃ）の液体導通スリットを形成し、当該間隔内に該液体導通スリットを通って塗布液体を一時的に保留可能にするコレクタを形成し、
前記先端筒部内に前記コレクタをその外周部が外気と連通可能に挿入し、
挿入された前記コレクタの後端面を凹面部に当接させて該後端面と凹面部中央との間に第１間隙（Ｂ）を形成し、並びに、この第１間隙と液体導通スリットとを連通させ、
コレクタ中央部に、中継芯を挿通させると共に、前記液体導通スリットに直接の導通をしない連通孔を形成し、
該コレクタの先端に連続する塗布体ホルダーに、中継芯の先端部に接合する塗布体を保持させ、
前記後端筒部内に、前記中継芯の後端部が前記コレクタの連通孔から跨りかつ第２間隙（Ａ）を持たせて挿入される連通孔と内周面の後端部に軸中心への突出部を有し、中継芯後端面を覆う筒状突起を設け、
該筒状突起に塗布液体が収容された交換可能なカートリッジの先端部を着脱自在に装填して、該カートリッジ内の先端開口部に設けたシールボール受け部と該シールボール受け部を密栓するシールボールの密栓解除により、塗布液体を前記中継芯を介して前記塗布体側に供給可能にする一方、
前記筒状突起の内壁と中継芯との間の第２間隙と前記第１間隙と液体導通スリットを連通してコレクタ保溜板同士の間隔内に塗布液体を一時的に保留可能にした塗布具であって、
第２間隙（Ａ）を０．０２ｍｍ≦Ａ≦０．２５ｍｍとし、
かつ、塗布液体が水をベースとし、その粘度が２５°Ｃで１２ｍＰａ・ｓ以下の液体であることを特徴とする液体塗布具液体塗布具である。
【００１６】
すなわち、本発明に係る液体塗布具においては、上記の構成を採用することにより、コレクタの後端面が当接する前記先軸内の隔壁の当接面を凹面部に段付き形成し、凹面部にて隔壁の当接面とコレクタの後端面との間の第１の間隙とを介して、筒状突起内周と中継芯との第２の間隙と、コレクタの塗布液体の保留板の軸方向に設けた導通スリットとを連通してなるので、カートッジ内の塗布液体をコレクタの保溜板の間隔内に一時的に保溜できる。
また、第２間隙Ａを０．０２ｍｍ≦Ａ≦０．２５ｍｍとし、その粘度を２５°Ｃで１２ｍＰａ・ｓ以下とするので、液体の塗布が進んでカートリッジ内が減圧したときにインクと空気の置換をスムーズにできるようにして、速やかにカートリッジ内の減圧を解消できる。したがって、筆記描線のカスレ等の筆記や塗布不良を無くせる。また、水性の塗布液体で粘度が低い場合でも、第２間隙の設定を上記のようにすれば液体は直流することはなく、良好である。
【００１７】
【発明の実施の形態】
以下、本発明の実施の形態を図１から図７に示す図面を参照しながら詳細に説明する。
図１は、本発明に係るカートリッジ交換式のマーカーペンあるいはサインペン等の筆記具の全体構成の一実施形態を示す。
【００１８】
図１に示す筆記具において、符号１は軸筒本体で、この軸筒本体１は、キャップ５０が取外し可能に被着される先軸（ペン先軸）１１と、この先軸１１に螺合状態で分離可能に装着される後軸（ペン後軸）１２とで形成されている。
【００１９】
先軸１１内は、図２に示すように、隔壁１３を介して先端筒部１４と後端筒部１５とに区画され、前記先軸１１内の隔壁１３の先端筒部１４側の面を周縁部より中央部の凹んだ段付き凹面部１９に形成したものである。
また、前記後端筒部１５内の中心軸には、筒状突起１６が設けられているとともに、この筒状突起１６には、顔料含有などのインクＷ（生インクとも称される）を収容した交換可能なカートリッジ４０の先端部が着脱自在に装填され、カートリッジ４０の先端開口部側に設けたシールボール受部４１を介して密栓するシールボール４２の密栓解除により、カートリッジ４０内のインクＷを筒状突起１６の連通孔１７に導入させるようになっている。
【００２０】
また、先軸１１の先端筒部１４の先端には、シール筒１８が設けられ、このシール筒１８を介してコレクタ２０が先端筒部１４内に挿入されている。このコレクタ２０は、先端筒部１４の内周面１４ａとの間に外気と連通可能に遊嵌状態で保持されていて、その中心軸には、筒状突起１６の連通孔１７に対接して連通する連通孔２１が設けられ、コレクタ２０の先端側を形成する口プラ２０ａには、ペン芯２２が連通孔２１の先端側部位に差込み保持されているとともに、このペン芯２２には、連通孔２１に挿入された中継芯２３の先端部２３ａが接合されている。
【００２１】
さらに、そのコレクタ２０の後端面２０ｂは、先軸１１内の隔壁１３凹面部１９に当接させて後端面２０ｂと凹面部１９との間に間隙Ｂ（第１の間隙に相当）を形成し、並びに、この間隙Ｂと幅Ｃのインクスリット（液体導通スリット）３２とを連通させる。
それと共に、連通孔２１に密接に挿入された中継芯２３の後端部２３ｂを先軸１１の後端筒部１５側に形成した筒状突起１６の連通孔１７側に跨って間隙（第２の間隙に相当）Ａを持たせて遊嵌状態で挿入する。これにより、中継芯２３を介して筒状突起１６の連通孔１７からコレクタ２０の連通孔２１側に導出された、カートリッジ４０内のインクＷは、ペン芯２２側に浸透供給するようになっている。
【００２２】
さらにまた、コレクタ２０の外周胴部には、インク保留部３０が設けられていて、このインク保留部３０は、軸方向に所望の間隔Ｄを存して櫛歯状に配置された複数枚の翼状保留板３１からなり、これら各々の翼状保留板３１間に跨って外気と連通可能なインクスリット３２が軸方向に設けられているとともに、このインクスリット３２のコレクタ後端面２０ｂ側の開口端３２ａを間隙Ｂを介して筒状突起１６内周面と中継芯２３との間隙Ａに連通させるようになっている。
【００２３】
すなわち、この間隙Ｂは、コレクタ２０の外周胴部に形成された幅Ｃのインクスリット３２と、筒状突起１６内周と中継芯２３との間隙Ａを連通させることにより、例えば、筆記時に軸筒本体１を握持する手指の体温等による温度上昇にてカートリッジ４０に作用する内圧変化に伴って溢出しようとする過剰インクＷをコレクタ２０に一時的に保留可能し、これにより、先端筒部１４の先端側からのインクＷの溢出を防止するようになっている。
【００２４】
そして、コレクタ２０の後端面２０ｂが当接する先軸１１内の隔壁１３の当接面１３ａには、図３から図５に示すように、凹面部１９が段付き形成されていて、この凹面部１９にて隔壁１３の当接面１３ａとコレクタ２０の後端面２０ｂとの間に間隙Ｂをインクスリット３２の開口端３２ａに対応させて形成することにより、間隙Ｂを介して、インクスリット３２と筒状突起１６内周と中継芯２３との間隙Ａが連通するようになっている。なお、先軸１１内の隔壁１３の当接面１３ａに段付き形成された凹面部１９には、軸外径方向に放射状に延びる複数条の凹溝３３が設けられている。
また、中継芯２３の後端部２３ｂが挿入される先軸１１の後端筒部１５側設けた筒状突起１６の連通孔１７の内周面１７ａには、図６及び図７に示すように、複数のリブ３４が軸周方向に形成されていて、これら各々のリブ３４にて中継芯２３の後端部２３ｂを筒状突起１６の連通孔１７の内周面１７ａとの間に間隙Ａを持たせて保持されるようになっている。
そして、中継芯２３の後端部２３ｂを筒状突起１６の連通孔１７の内周面１７ａとの間に間隙Ａを０．０２ｍｍ≦Ａ≦０．２５ｍｍに設定している。
また、インクは水をベースとし、その粘度が２５°Ｃで１２ｍＰａ・ｓ以下の水性インクである。
【００２５】
実施形態の筆記具では、使用するインクは、カートリッジ４０内に収容するが、間隙Ａの寸法とインクの粘度を種々に設定して、評価したところ、上記の寸法範囲で設定すれば、水性インクで良好な結果が得られた。
以下に行った評価試験を説明する。
【００２６】
まず、インク粘度を２５°Ｃで６ｍＰａ・ｓの水性インクを使用して様々な間隙Ａの寸法の筆記具について評価試験を行った。試験結果は次表に示す。
【００２７】
【表１】

【００２８】
試験結果から分かるように、間隙Ａが０．０２ｍｍ以上で筆記カスレに良好な評価が得られたが、インク直流については、０．２５ｍｍ以下で良好であった。このことから上記のように、間隙Ａは０．０２ｍｍ≦Ａ≦０．２５ｍｍの寸法範囲にすることが適切であることが分かる。さらには、「筆記カスレ評価」に極めて良好な評価が得られたことから、間隙Ａは０．０５ｍｍ≦Ａ≦０．２５ｍｍに設定することが、より好ましい。
【００２９】
また、インク粘度が大きくなると、インクの中継芯の毛細管力によるペン芯へのインク供給のためインク流れが悪くなり、筆記カスレが発生しやすくなる。そのため、間隙Ａが少ない場合には、問題が無いか確認したところ次表の結果が得られた。
【００３０】
【表２】

【００３１】
この結果から、粘度は２５°Ｃで１２ｍＰａ・ｓ以下であれば筆記カスレの問題が生じないことを確認した。
【００３２】
以上のことから、前記間隙Ａは０．０２ｍｍ≦Ａ≦０．２５ｍｍの寸法範囲に設定することにより、筆記性の良好な筆記具を設計することができることが分かったものである。
【００３３】
なお、上記した実施形態において、サインペンなどの筆記具を例に説明したが、これに限定されるものではなく、眉描き等の化粧用の塗布具などにも適用することが可能である。その他、本発明は、本発明の要旨を免脱しない範囲で種々変更実施可能なことはいうまでもない。
【００３４】
【発明の効果】
以上の説明から明らかなように、本発明によれば、筆記描線が薄くなることによる筆記カスレや液体直流の生じない筆記性能等の塗布性能が良好になり、安定した塗布液体の供給性能が得られる。
【図面の簡単な説明】
【図１】本発明に係るサインペンの全体構成の一実施形態を示す断面図である。
【図２】同じくキャップ取外し状態の要部拡大断面図である。
【図３】同じく先軸の拡大断面図である。
【図４】図３のＩ−Ｉ線矢視方向から見た先軸の隔壁の断面図である。
【図５】同じく先軸の隔壁部位の要部拡大断面図である。
【図６】図３のII−II線矢視方向から見た筒状突起の要部拡大断面図である。
【図７】図６のIII−III線矢視方向から見た筒状突起の要部断面図である。
【図８】従来のサインペンの一例を示す断面図である。
【符号の説明】
１軸筒本体
１１先軸
１２後軸
１３隔壁
１３ａ当接面
１４先端筒部
１４ａ内周面
１５後端筒部
１６筒状突起
１７連通孔
１７ａ内周面
１８シール筒
１９凹面部
２０コレクタ
２０ａ口プラ（先端部）
２０ｂ後端面
２１連通孔
２２ペン芯
２３中継芯
２３ａ先端部
２３ｂ後端部
３０インク保留部
３１翼状保留板
３２インクスリット
３２ａ開口端
３３凹溝
３４リブ
４０カートリッジ
４１シールボール受部
４２シールボール
Ａ筒状突起の連通孔内周面と中継芯後端部外周との間の間隙
Ｄ翼状保留板の間隔
Ｂコレクタ後端面と隔壁の当接面との間の間隙
Ｃ液体導通スリットの幅
Ｗインク[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid applicator such as a writing instrument such as a sign pen or a makeup tool such as an eyebrow brush, and more specifically, a cartridge that can stably supply ink (also referred to as ink) to a pen core. The present invention relates to a replaceable liquid applicator.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a sign pen used as an applicator, for example, a writing instrument, has a configuration in which an ink cartridge can be replaced as disclosed in, for example, Japanese Utility Model Publication No. 6-45776.
[0003]
In this type of cartridge exchangeable writing instrument, as shown in FIG. 8, the shaft cylinder main body 100 is formed by a front shaft 101 and a rear shaft 102 that is separably screwed to the front shaft 101 and is attached. 101 is divided into a front end cylinder part 104 and a rear end cylinder part 105 via a partition wall 103.
[0004]
A cylindrical projection 106 is provided on the central axis in the rear end cylindrical portion 105 of the front shaft 101, and the front end portion of the replaceable cartridge 400 containing ink W is detachably attached to the cylindrical projection 106. The ink W in the cartridge 400 is introduced into the communication hole 107 of the cylindrical protrusion 106 by releasing the sealing ball 402 that is loaded into the cartridge 400 and sealed with the sealing ball receiving portion 401 provided on the tip opening side of the cartridge 400. It is like that.
[0005]
Further, a seal tube 108 is provided at the tip of the tip tube portion 104 of the front shaft 101, and the collector 200 is inserted into the tip tube portion 104 through the seal tube 108. The collector 200 is held in a loosely-fitted state so as to be able to communicate with the outside air between the inner peripheral surface 104a of the distal end cylindrical portion 104, and a central axis thereof is in contact with the communication hole 107 of the cylindrical protrusion 106. A communication hole 201 for communication is provided.
[0006]
Furthermore, a pen core 202 is inserted into and held by the tip portion of the communication hole 201 on the mouthpiece (holder) 200a on the tip side of the collector 200. The rear end surface 200b of the collector 200 has a front shaft. 101 is made to abut against the partition wall 103 in 101, and the leading end portion 203 a of the relay core 203 inserted into the communication hole 201 is joined to the pen core 202, while the rear end portion 203 b of the relay core 203 is connected to the front shaft 101. The collector 200 is inserted through the communication hole 107 of the cylindrical projection 106 by inserting the gap A across the communication hole 107 side of the cylindrical projection 106 formed on the rear end cylindrical portion 105 side and inserting it in a loose fit state. The ink W in the cartridge 400 introduced into the communication hole 201 is permeated and supplied to the pen core 202 through the relay core 203.
[0007]
Furthermore, an ink retaining portion 300 is provided on the outer peripheral body portion of the collector 200, and the ink retaining portion 300 is a plurality of sheets arranged in a comb shape with a desired interval D in the axial direction. An ink slit 302 that is composed of a wing-shaped retaining plate 301 and that communicates with the outside air is provided between the wing-shaped retaining plates 301 in the axial direction, and an opening end 302a on the collector rear end surface 200b side of the ink slit 302 is provided. The communication hole 107 of the cylindrical protrusion 106 is communicated with a gap B.
[0008]
That is, the gap B is formed by connecting the ink slit 302 formed in the outer peripheral body portion of the collector 200 and the communication hole 107 of the cylindrical protrusion 106, for example, fingers for gripping the shaft cylinder main body 100 during writing. The internal pressure change acting on the cartridge 400 due to the temperature rise due to the body temperature or the like can be absorbed, and excess ink W trying to overflow due to such a change in internal pressure can be temporarily retained. The overflow of the ink W from the front end side is prevented.
[0009]
[Problems to be solved by the invention]
By the way, in a writing instrument of the type in which the ink slit of the collector is in direct contact with the ink flowing out from the ink storage part (cartridge), the dimension of the ink slit is important for balancing the replacement of air and ink. However, like the above writing instrument, the cylindrical protrusion (106) of the front shaft is fitted into the cartridge, and the gap directly in contact with the ink forms a gap A formed by the relay core and the inner peripheral surface of the cylindrical protrusion. In the case of a writing instrument, the writing performance is determined by the relationship between the gap A and the ink physical properties, particularly the viscosity.
[0010]
The gap A becomes a place for replacing the air in the collector and the ink in the cartridge (ink storage unit), and the ease of the replacement is determined by the size of the gap.
During normal writing, the ink moves from the pen core to a writing object such as paper, and the ink in the cartridge is supplied to the pen core via the relay core. When the ink in the cartridge is pulled and moved by the capillary force of the relay core, the inside of the cartridge is in a reduced pressure state, and the air entering from the ink and the collector is replaced by the gap A, and the air enters the cartridge and the reduced pressure state. And the designed normal ink outflow amount is determined.
[0011]
However, if the gap A is narrow, it becomes difficult to replace air and ink in the gap A. If the pressure reduction of the cartridge does not become extremely large for replacement, the replacement does not occur, and if the pressure reduction state of the cartridge is not eliminated, the pressure reduction And the ink in the cartridge is prevented from being drawn out by the capillary force of the relay core, the writing line becomes thin and writing defects such as blurring occur. In addition, when the viscosity of the ink is high, blurring occurs due to the slow air replacement speed during writing.
[0012]
On the other hand, the gap A simultaneously acts as air replacement, and at the same time, the ink and air interface is formed in the gap A when the pen core is faced downward, so that the surface tension prevents the ink from dripping from the pen core during writing, and the writing flow rate. This prevents and stabilizes the leakage of ink from the pen core (direct current).
[0013]
However, when the size of the gap A is large, the replacement of air and ink can be easily performed, and thus writing defects such as scumming do not occur when writing, but for example, a cap is attached to make it face down at 50 ° C. When evaluating whether or not the ink leaks from the pen core in the direct current test for a day, the surface tension of the ink decreases due to the temperature rise, and the ability to hold the ink in the gap A becomes weak, and the ink leaks from the pen core. Will occur.
[0014]
The present invention has been made in view of the above-described problems, and can reliably prevent the occurrence of dull or direct current application defects in application liquids such as inks and cosmetics, thereby obtaining stable liquid application performance. An object of the present invention is to provide an applicator.
[0015]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention has the following configuration.
The present invention forms a shaft cylinder body with a front shaft and a rear shaft that is detachably mounted on the front shaft,
The inside of the front shaft of the shaft tube body is divided into a front tube portion and a rear tube portion through a partition wall,
Forming the surface on the tip tube portion side of the partition wall in the front shaft into a stepped concave surface portion that is recessed in the center portion from the peripheral portion,
A liquid conducting slit having a predetermined width (C) is formed in the axial direction between the retaining plates in a plurality of retaining plates arranged at intervals (D) in the axial direction on the outer peripheral body, Forming a collector in which the application liquid can be temporarily retained through the liquid conduction slit,
Inserting the collector into the tip tube portion so that the outer peripheral portion can communicate with the outside air,
The rear end surface of the inserted collector is brought into contact with the concave portion to form a first gap (B) between the rear end surface and the center of the concave portion, and the first gap and the liquid conduction slit are communicated with each other. Let
In the center of the collector, a relay core is inserted, and a communication hole that does not conduct directly to the liquid conduction slit is formed,
In the applicator holder continuous to the tip of the collector, the applicator joined to the tip of the relay core is held,
The rear end portion of the relay core is inserted into the rear end cylindrical portion so as to straddle the communication hole of the collector and with the second gap (A), and the rear end portion of the inner peripheral surface is centered on the axis. Provided with a cylindrical projection covering the rear end surface of the relay core ,
A seal ball receiving portion provided at a front end opening in the cartridge and a seal that tightly plugs the seal ball receiving portion are detachably loaded at the tip of the replaceable cartridge in which the coating liquid is stored in the cylindrical protrusion. While releasing the sealing plug of the ball, the application liquid can be supplied to the application body side through the relay core,
An applicator in which the second gap between the inner wall of the cylindrical projection and the relay core, the first gap, and the liquid conduction slit communicate with each other so that the application liquid can be temporarily held in the interval between the collector storage plates. Because
The second gap (A) is 0.02 mm ≦ A ≦ 0.25 mm,
A liquid applicator liquid applicator characterized in that the application liquid is water-based and has a viscosity of 12 mPa · s or less at 25 ° C.
[0016]
That is, in the liquid applicator according to the present invention, by adopting the above-described configuration, the contact surface of the partition wall in the front shaft with which the rear end surface of the collector contacts is stepped on the concave surface portion, and the concave surface portion Through the first gap between the abutment surface of the partition wall and the rear end surface of the collector, the second gap between the inner circumference of the cylindrical projection and the relay core, and the axial direction of the retaining plate of the collector coating liquid In this way, the application liquid in the cartridge can be temporarily retained within the interval between the retention plates of the collector.
In addition, since the second gap A is 0.02 mm ≦ A ≦ 0.25 mm, and the viscosity is 12 mPa · s or less at 25 ° C., the ink and the air can be removed when the liquid is applied and the inside of the cartridge is depressurized. As a result of the smooth replacement, the reduced pressure in the cartridge can be quickly eliminated. Accordingly, it is possible to eliminate writing and coating defects such as blurring of writing lines. Even when the viscosity of the aqueous coating liquid is low, if the second gap is set as described above, the liquid does not cause direct current and is satisfactory.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings shown in FIGS.
FIG. 1 shows an embodiment of the overall configuration of a writing instrument such as a cartridge-replaceable marker pen or a sign pen according to the present invention.
[0018]
In the writing instrument shown in FIG. 1, reference numeral 1 denotes a shaft tube main body. The shaft tube main body 1 is screwed onto a tip shaft (pen tip shaft) 11 on which a cap 50 is detachably attached. The rear shaft (pen rear shaft) 12 is detachably mounted.
[0019]
As shown in FIG. 2, the front shaft 11 is partitioned into a front tube portion 14 and a rear tube portion 15 via a partition wall 13, and a surface of the partition wall 13 in the front shaft 11 on the side of the front tube portion 14. It is formed in a stepped concave surface portion 19 having a central portion recessed from the peripheral edge portion.
In addition, a cylindrical protrusion 16 is provided on the central axis in the rear end cylindrical portion 15, and ink W (also referred to as raw ink) containing pigment is contained in the cylindrical protrusion 16. The ink W in the cartridge 40 is released by releasing the sealing ball 42 that is detachably loaded at the tip of the replaceable cartridge 40 and is sealed through the sealing ball receiving portion 41 provided on the tip opening side of the cartridge 40. Is introduced into the communication hole 17 of the cylindrical protrusion 16.
[0020]
Further, a seal tube 18 is provided at the tip of the tip tube portion 14 of the front shaft 11, and a collector 20 is inserted into the tip tube portion 14 through the seal tube 18. The collector 20 is held in a loosely-fitted state so as to be able to communicate with the outside air between the inner peripheral surface 14a of the distal end cylindrical portion 14, and the central axis thereof is in contact with the communication hole 17 of the cylindrical protrusion 16. A communication hole 21 that communicates is provided, and a pen core 22 is inserted and held in the tip side portion of the communication hole 21 in the mouth plug 20 a that forms the front end side of the collector 20, and the pen core 22 communicates with the pen core 22. The front end portion 23a of the relay core 23 inserted into the hole 21 is joined.
[0021]
Further, the rear end surface 20 b of the collector 20 is brought into contact with the concave surface portion 19 of the partition wall 13 in the front shaft 11 to form a gap B (corresponding to the first gap) between the rear end surface 20 b and the concave surface portion 19. In addition, the gap B and the ink slit (liquid conduction slit) 32 having a width C are communicated with each other.
At the same time, the rear end 23 b of the relay core 23 that is closely inserted into the communication hole 21 extends over the communication hole 17 side of the cylindrical protrusion 16 formed on the rear end cylindrical portion 15 side of the front shaft 11 (second (second)). Inserted in a loose fitting state with A. Accordingly, the ink W in the cartridge 40 led out from the communication hole 17 of the cylindrical protrusion 16 to the communication hole 21 side of the collector 20 via the relay core 23 is permeated and supplied to the pen core 22 side. Yes.
[0022]
Furthermore, an ink retaining portion 30 is provided on the outer peripheral body portion of the collector 20, and the ink retaining portion 30 is a plurality of sheets arranged in a comb shape with a desired interval D in the axial direction. An ink slit 32 that is formed of a wing-shaped retaining plate 31 and that communicates with the outside air is provided between the wing-shaped retaining plates 31 in the axial direction, and the opening end 32a of the ink slit 32 on the collector rear end face 20b side. Is communicated with the gap A between the inner peripheral surface of the cylindrical protrusion 16 and the relay core 23 via the gap B.
[0023]
That is, the gap B is formed by connecting the ink slit 32 having a width C formed in the outer peripheral body of the collector 20 and the gap A between the inner periphery of the cylindrical protrusion 16 and the relay core 23, for example, when writing. Excess ink W that tends to overflow due to a change in internal pressure acting on the cartridge 40 due to a temperature rise due to the body temperature of a finger gripping the cylinder main body 1 can be temporarily retained in the collector 20, whereby the tip cylinder portion The overflow of the ink W from the front end side of 14 is prevented.
[0024]
The contact surface 13a of the partition wall 13 in the front shaft 11 with which the rear end surface 20b of the collector 20 abuts is formed with a concave surface portion 19 as shown in FIGS. 3 to 5, and this concave surface portion is formed. 19, a gap B is formed between the contact surface 13 a of the partition wall 13 and the rear end face 20 b of the collector 20 so as to correspond to the opening end 32 a of the ink slit 32. A gap A between the inner periphery of the cylindrical protrusion 16 and the relay core 23 is communicated. The concave surface portion 19 formed in a stepped manner on the contact surface 13a of the partition wall 13 in the front shaft 11 is provided with a plurality of concave grooves 33 extending radially in the axial outer diameter direction.
6 and 7, the inner peripheral surface 17a of the communication hole 17 of the cylindrical protrusion 16 provided on the rear end cylinder part 15 side where the rear end part 23b of the relay core 23 is inserted is provided. In addition, a plurality of ribs 34 are formed in the axial circumferential direction, and the gap between the rear end 23 b of the relay core 23 and the inner peripheral surface 17 a of the communication hole 17 of the cylindrical protrusion 16 is formed in each of the ribs 34. A is held and held.
The gap A is set to 0.02 mm ≦ A ≦ 0.25 mm between the rear end portion 23 b of the relay core 23 and the inner peripheral surface 17 a of the communication hole 17 of the cylindrical protrusion 16.
The ink is a water-based ink having a viscosity of 12 mPa · s or less at 25 ° C. based on water.
[0025]
In the writing instrument of the embodiment, the ink to be used is accommodated in the cartridge 40. When the dimension of the gap A and the viscosity of the ink are variously set and evaluated, if the ink is used within the above dimension range, the ink is water-based ink. Good results were obtained.
The evaluation test performed below will be described.
[0026]
First, an evaluation test was performed on writing instruments having various gap A dimensions using an aqueous ink having an ink viscosity of 25 mC and 6 mPa · s. The test results are shown in the following table.
[0027]
[Table 1]

[0028]
As can be seen from the test results, good evaluation was obtained in writing blur when the gap A was 0.02 mm or more, but the ink direct current was good at 0.25 mm or less. Thus, as described above, it is understood that the gap A is appropriately set to a size range of 0.02 mm ≦ A ≦ 0.25 mm. Furthermore, since extremely good evaluation was obtained for “writing evaluation”, the gap A is more preferably set to 0.05 mm ≦ A ≦ 0.25 mm.
[0029]
Further, when the ink viscosity is increased, the ink flow is deteriorated due to the ink supply to the pen core due to the capillary force of the ink relay core, and writing blur is likely to occur. Therefore, when the gap A was small, it was confirmed that there was no problem, and the result shown in the following table was obtained.
[0030]
[Table 2]

[0031]
From this result, it was confirmed that there was no problem of writing blur if the viscosity was 12 mPa · s or less at 25 ° C.
[0032]
From the above, it has been found that a writing instrument with good writing property can be designed by setting the gap A to a size range of 0.02 mm ≦ A ≦ 0.25 mm.
[0033]
In the above-described embodiment, the writing instrument such as a sign pen has been described as an example. However, the present invention is not limited to this, and can be applied to a cosmetic applicator such as eyebrow drawing. In addition, it goes without saying that the present invention can be variously modified without departing from the gist of the present invention.
[0034]
【The invention's effect】
As is apparent from the above description, according to the present invention, the coating performance such as writing shading due to the thin writing line and the writing performance that does not generate liquid direct current is improved, and a stable coating liquid supply performance is obtained. It is done.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the overall configuration of a sign pen according to the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part in the same state with a cap removed.
FIG. 3 is an enlarged cross-sectional view of the front shaft.
4 is a cross-sectional view of a partition wall of a front axis viewed from the direction of arrows II in FIG. 3;
FIG. 5 is an enlarged cross-sectional view of the main part of the partition wall portion of the front shaft.
6 is an enlarged cross-sectional view of a main part of a cylindrical protrusion viewed from the direction of arrows II-II in FIG.
7 is a cross-sectional view of a main part of a cylindrical protrusion as viewed from the direction of arrows III-III in FIG.
FIG. 8 is a cross-sectional view showing an example of a conventional sign pen.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder main body 11 Lead axis | shaft 12 Rear axis | shaft 13 Partition wall 13a Contact surface 14 Front end cylinder part 14a Inner peripheral surface 15 Rear end cylinder part 16 Cylindrical protrusion 17 Communication hole 17a Inner peripheral surface 18 Seal cylinder 19 Concave part 20 Collector 20a Port Plastic (tip)
20b rear end surface 21 communication hole 22 pen core 23 relay core 23a front end portion 23b rear end portion 30 ink retaining portion 31 wing-shaped retaining plate 32 ink slit 32a opening end 33 concave groove 34 rib 40 cartridge 41 seal ball receiving portion 42 seal ball A cylinder Gap D between the inner peripheral surface of the communication hole of the protrusion and the outer periphery of the rear end of the relay core B gap of the wing-shaped retaining plate B gap C between the rear end surface of the collector and the contact surface of the partition wall W of the liquid conduction slit W ink

Claims

A shaft cylinder body is formed by a front shaft and a rear shaft that is detachably mounted on the front shaft,
The inside of the front shaft of the shaft tube body is divided into a front tube portion and a rear tube portion through a partition wall,
Forming the surface on the tip tube portion side of the partition wall in the front shaft into a stepped concave surface portion that is recessed in the center portion from the peripheral portion,
A liquid conducting slit having a predetermined width (C) is formed in the axial direction between the retaining plates in a plurality of retaining plates arranged at intervals (D) in the axial direction on the outer peripheral body, Forming a collector in which the application liquid can be temporarily retained through the liquid conduction slit,
Inserting the collector into the tip tube portion so that the outer peripheral portion can communicate with the outside air,
The rear end surface of the inserted collector is brought into contact with the concave portion to form a first gap (B) between the rear end surface and the center of the concave portion, and the first gap and the liquid conduction slit are communicated with each other. Let
In the center of the collector, a relay core is inserted, and a communication hole that does not conduct directly to the liquid conduction slit is formed,
In the applicator holder continuous to the tip of the collector, the applicator joined to the tip of the relay core is held,
The rear end portion of the relay core is inserted into the rear end cylindrical portion so as to straddle the communication hole of the collector and with the second gap (A), and the rear end portion of the inner peripheral surface is centered on the axis. Provided with a cylindrical projection covering the rear end surface of the relay core ,
A seal ball receiving portion provided at a front end opening in the cartridge and a seal that tightly plugs the seal ball receiving portion are detachably loaded at the tip of the replaceable cartridge in which the coating liquid is stored in the cylindrical protrusion. While releasing the sealing plug of the ball, the application liquid can be supplied to the application body side through the relay core,
An applicator in which the second gap between the inner wall of the cylindrical projection and the relay core, the first gap, and the liquid conduction slit communicate with each other so that the application liquid can be temporarily held in the interval between the collector storage plates. Because
The second gap (A) is 0.02 mm ≦ A ≦ 0.25 mm,
A liquid applicator characterized in that the application liquid is based on water and has a viscosity of 12 mPa · s or less at 25 ° C.