JP4462718B2

JP4462718B2 - Ink or coating liquid storage device and manufacturing method thereof

Info

Publication number: JP4462718B2
Application number: JP2000159906A
Authority: JP
Inventors: 芳臣神瀬
Original assignee: Mitsubishi Pencil Co Ltd
Current assignee: Mitsubishi Pencil Co Ltd
Priority date: 2000-05-30
Filing date: 2000-05-30
Publication date: 2010-05-12
Anticipated expiration: 2020-05-30
Also published as: JP2001334790A

Description

【０００１】
【発明の属する技術分野】
本発明は、筆記具や塗布具などのインクあるいは塗布液使用具に備えられて、タンク内の圧力変化に応じて、インクあるいは塗布液を一時的に溜めるインクあるいは塗布液保溜装置およびその製造方法に関する。
【０００２】
【従来の技術】
インクタンク内の圧力変化に応じて、インクを一時的に溜めるインク保溜装置を有した筆記具がある。一般に筆記具では、実開昭５８−２１４７４号公報等に示されるように、インキタンクの前方に一時的インク保溜装置が内装されており、つまり、軸内において、円盤状薄板部を複数間隔をおいて配列して断面櫛歯状に形成し、この薄板部間の隙間にインクを一時的に保溜するいわゆるジャバラと称されるインク保溜装置を設けている。
【０００３】
このような筆記具に用いられる一時的インク保溜装置では、図７に断面視するように、円盤状薄板部ａを複数積層して、重なる薄板部ａ間の隙間をインク保溜溝として軸筒ｂに内装し、それと共に中心線ｃに対して直角方向に切り欠き部ｄを設けて、この切り欠き部ｄをインク保溜溝と外気を繋ぐ空気溝としている。
なお、図７において、符号ｅは複数の薄板部材ａの共通する基部（軸部）を断面視したものであり、内部にインク中継芯ｆを挿通する孔部が形成されている。また、ｇは図示しないインクタンクからインク保溜溝に連通してインク導出を行うインク導通溝（スリット）である。
【０００４】
【発明が解決しようとする課題】
しかしながら、前記従来のインクあるいは塗布液保溜装置では、インキあるいは塗布液保溜量を増大させるべく、円盤状の薄板部の面積を広げると、薄板部の強度が弱くなることがあった。これに対して、薄板部を厚く形成するのでは、保溜溝の数が少なくなり、結局インクあるいは塗布液保溜量が少なくなる。
【０００５】
本発明は、前記従来の問題点に鑑みてなされたものであって、薄板部材を厚くしなくても強度を保って広い面積にでき、インクあるいは塗布液保溜量を増大できるインクあるいは塗布液保溜装置およびその製造方法を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明は、前記課題を解決するため、筆記具や塗布具などのインクあるいは塗布液の使用具に備えられ、
複数の薄板部材を各々間に隙間を空けて積層し、タンク内の圧力変化に応じて、この
隙間にインクあるいは塗布液を一時的に溜める構造を有した樹脂製のインクあるいは塗布液保溜装置において、
前記複数の薄板部材を繋いで支持する軸部を形成し、
前記隙間内に設けて前記隙間の間隔を保持する第１保持部材および第２保持部材からなる２対の保持部材を、概略板状であって前記軸部から薄板部材外周縁に向かい、かつ、第１保持部材と第２保持部材が互いに垂直方向に向くように形成し、
前記隙間内に設けて前記隙間の間隔を保持する副保持部材を、第１保持部材からそのほぼ直角方向であって第２保持部材に平行に延びるように形成し、
前記第２保持部材の１つには各薄板部材間にインクあるいは塗布液を誘導するスリットを前記薄板部材の外周縁から第２保持部材にかけて形成し、前記薄板部材には、その外周縁から副保持部材と軸部間に先端が位置するように、切り欠き部を設けたことを特徴とするインクあるいは塗布液保溜装置の構成を有する。
本発明によれば、薄板部材同士の間隔を保持部材で保持できるため、薄板部材を厚くしなくても強度を保って広い面積にでき、インクあるいは塗布液保溜量を増大できる。
【０００７】
なお、対の保持部材を複数形成すれば、薄板部材の支持が複数あるいは、多数箇所ででき、より隙間の間隔保持を確実にできる。
【０００８】
また、前記隙間内に保持部材と共に副保持部材を設けるので一層前記隙間の間隔を確実に保持できる。そして、この副保持部材を、第１保持部材（先端のみあるいは途中箇所ならびに双方等）からそのほぼ直角方向に延びるように形成したので、隙間保持をきめ細かく確実に行える。また、薄板部材断面が円形でなく異形であり、保持部材では保持しきれないときでも、副保持部材を多数形成して対応し支持できる。
また、前記保持部材の一つには、各薄板部材（枚葉体）間にインクあるいは塗布液を誘導するスリットを形成するので、薄板部材のスリット形成箇所を保持部材で支持することができ、当該箇所の剛性を高めて射出成型時の精度を保つことができる。
また、前記薄板部材には、その外周縁から副保持部材と軸部間に先端が位置するように、切り欠き部を設けるので、十分な断面の空気通路を形成できる。
本発明は、筆記具や塗布具などのインクあるいは塗布液の使用具に備えられ、
複数の薄板部材を各々間に隙間を空けて積層し、タンク内の圧力変化に応じて、この
隙間にインクあるいは塗布液を一時的に溜める構造を有した樹脂製のインクあるいは塗布液保溜装置の製造方法において、
前記複数の薄板部材を繋いで支持する軸部と、前記隙間内に設けて前記隙間の間隔を保持する第１保持部材および第２保持部材からなる２対の保持部材とを、概略板状であって前記軸部から薄板部材外周縁に向かい、かつ、第１保持部材と第２保持部材が互いに垂直方向に向くように、二つ割の金型を用いて一体に射出成形するものであって、軸部と対の第１保持部材は金型の合わせ面上の凹部で形成し、
前記第２保持部材を金型の割後退方向に沿った凹部で形成すると共に、前記隙間内に設けて前記隙間の間隔を保持する副保持部材を第１保持部材からそのほぼ直角方向であって第２保持部材に平行に延びるように前記金型の割後退方向に沿った凹部で形成し、
前記第２保持部材の１つには各薄板部材間にインクあるいは塗布液を誘導するスリットであって前記薄板部材の外周縁から第２保持部材に係るスリットを割後退方向に沿った板状金型で形成し、前記薄板部材には、その外周縁から副保持部材と軸部間に先端が位置するように、切り欠き部を設けたことを特徴とするインクあるいは塗布液保溜装置の製造方法である。
本発明のインクあるいは塗布液保溜装置の製造方法によれば、少なくとも軸部と保持部材は、二つ割の金型を用いて一体に射出成形するものであって、軸部と対の第１保持部材は金型の合わせ面上の凹部で形成すると共に、対の第２保持部材は金型の割後退方向に沿った凹部で形成した。これによって、射出成形に際して、割型の後退に抵抗を生じることなく成形できるものになる。
また、副保持部材は金型の割後退方向に沿った凹部で形成するので、射出成形に際して、割型の後退に抵抗を生じることなく成形できるものになる。
【０００９】
【発明の実施の形態】
以下、図面を参照して本発明の実施の形態を詳細に説明する。
図１は実施形態にかかるインクあるいは塗布液（以下、インクと記する）の保溜装置を備えた一例の筆記具の縦断面図、図２はＡ−Ａ線に沿って横断面視した参考例１のインク保溜装置の説明図、図３は同じくＡ−Ａ線に沿って横断面視した参考例２のインク保溜装置の説明図、図４は同じくＡ−Ａ線に沿って横断面視した実施形態のインク保溜装置の説明図、図５は同じくＡ−Ａ線に沿って横断面視した参考例３のインク保溜装置の説明図、図６は同じくＡ−Ａ線に沿って横断面視した参考例４のインク保溜装置の説明図である。各実施形態では、共通部分に同一符号を付している。
【００１０】
インク保溜装置は、図１の筆記具（や塗布具などのインク使用具）に備えられ、実施形態の場合、複数の薄板部材１６，１６…を各々間に隙間（インク保溜溝１８）を空けて積層し、インクタンク１０内の圧力変化に応じて、このインク保溜溝１８にインクを一時的に溜める構造を有した樹脂製のインク保溜装置１２である。
【００１１】
前記インク保溜装置１２は、厚い円盤状の後端部分１２ａ外周が軸筒１４に嵌着して水密に形成されており、この後端部分１２ａ前方部は、薄い円盤状の薄板部材１６を複数積層した構造であって、この複数の薄板部材（実施形態では羽根状の枚葉体）１６，１６…間に毛細管力によりインクを貯留するインク保溜溝（横溝）１８を構成するものである。
【００１２】
また、各薄板部材１６には、前記軸筒１４中心から直角方向にスリット状のインク誘導溝（縦溝）２０が形成されている。このインク誘導溝（縦溝）２０の溝幅はインク保溜溝１８のどの溝幅よりも小さくできていて、常にインクが満ちていて、インクタンク１０内の圧力上昇時の余剰インクをインク保溜溝（横溝）１８に直ちに供給できるようになっている。このインク誘導溝２０は各薄板部材１６に亙って形成されると共に前記後端部分１２ａのインクタンク１０内への開口溝１２ｂに連続形成されており、後端部分１２の開口溝１２ｂは一定の毛細管力が得られる幅に形成されてインクタンク１０内に開口している。
【００１３】
また、インク保溜装置１２では、積層した薄板部材１６は中央部を中空筒状部２２で固定支持した構造を有している。この中空筒状部（軸部に相当）２２内には、樹脂製成形品や繊維束などからなる中継芯２４があり、中継芯２４によりインクタンク１０内のインクを軸筒１４先端部に配設されたペン先２６に供給している。
ペン先２６を軸筒１４先端部に固定・保持するホルダー２８には、ペン先２６に平行に外部と軸筒１４内のインク保溜装置１２を連通する空気孔３０が形成されている。
【００１４】
前記インク保溜装置１２には、前記中空筒状部２２により、前記積層された薄板部材１６，１６…同士を繋いで支持し、それらの間隔（インク保溜溝１８間隔）を保持する。
【００１５】
さらに参考例１では、図２に示すように、それらインク保溜溝１８内に、該保溜溝１８（隙間）の間隔を保持する２対の保持部材３２，３４を、前記中空筒状部２２から薄板部材１６外周縁に向かう互いに垂直の放射線Ｌ１，Ｌ２上に形成したものである。なお、インク誘導溝２０は、中心軸から薄板部材１６，１６… 外周縁に向けて放射方向に、かつ、軸に沿って縦方向に複数の薄板部材１６，１６…と一つの保持部材３２とに共通に細溝に形成されている。
【００１６】
保持部材はインク保溜装置の横断面視で、幅狭かつ先細の棒状に延びているが、複数の薄板部材１６，１６…間に配設・形成されたそれぞれ２対の保持部材３２，３４は、中空筒状部２２に沿って集合して見ると薄板部材１６，１６…を貫くように概略板形状を呈し、この概略板は中空筒状部２２から互いに９０度の角度を隔てて放射方向に立設している。
また、保持部材３２，３４は、先端が円盤状の薄板部材１６，１６…の半径の少なくとも１／３以上の長さに形成して、薄板部材１６，１６…を補強してインク保溜装置１２の強度を増し、インク保溜溝１８の間隔の変化を防止している。
また、実施形態のインク保溜装置１２では、保持部材３２，３４と薄板部材１６，１６…は一体に成形している。これにより、薄板部材１６，１６…のインク誘導溝形成箇所を保持部材で支持することができ、当該箇所の剛性を高めて射出成型時の精度を保つことができる。
前記保持部材３２，３４の一つ（実施形態では３４の一方）には、各薄板部材１６，１６…間にインクを誘導するインク誘導溝２０を形成したものである。これにより、薄板部材１６，１６…のインク誘導溝２０形成箇所を保持部材で支持することができ、当該箇所の剛性を高めて射出成型時の精度を保つことができる。
【００１７】
参考例１では、薄板部材１６，１６…同士の間隔を中空筒状部２２と共に、保持部材３２，３４で保持でき、したがって、薄板部材１６，１６…を厚くしなくても強度を保って広い面積にでき、インク保溜量を増大できる。また、対の保持部材を複数(参考例１では２つの第１の保持部材３２、第２の保持部材３４)形成しているので、薄板部材１６，１６…の支持が複数あるいは、多数箇所ででき、よりインク保溜溝１８の間隔保持を確実にできる。
【００１８】
ここで、中空筒状部２２と保持部材３２，３４は、二つ割の金型を用いて一体に射出成形するものであって、中空筒状部３２と１対の第１保持部材３２は図示しない金型の合わせ面（Ｌ１に一致させている）上の凹部で形成したものである。また、対の第２保持部材３４は該金型の割後退方向（Ｌ２に並行）に沿った凹部で形成したものである。これらのようにして、射出成形に際して、割型の後退に抜き抵抗を生じることなく成形できるものになる。
【００１９】
参考例２に係るインク保溜装置を説明する。このインク保溜装置では、図３に示すように、薄板部材１６，１６…の隙間１８内に保持部材３２，３４を設けると共に一方の保持部材３２先端から直角方向に枝分かれした形状の副保持部材３６を設けている。この構成によれば、参考例１より一層前記インク保溜溝１８の間隔を確実に保持できる。
そして、この副保持部材３６を、第１保持部材（先端のみあるいは途中箇所ならびに双方等）からそのほぼ直角方向に延びるように形成したことが好適である。隙間保持をきめ細かく確実に行える。
【００２０】
実施形態のインク保溜装置は、図４に示すように、隙間１８内に保持部材３２，３４を設けると共に一方の保持部材３２先端から直角方向に枝分かれした形状の副保持部材３６を設けている点で前記参考例２と共通し、さらに、薄板部材１６，１６… に、その外周縁から副保持部材３６と中空筒状部２２間に先端が位置するように、切り欠き部３８を設けたものである。この切り欠き部３８で十分な断面の空気通路を形成できる。積層された薄板部材１６，１６…では、それぞれの切り欠き部３８が軸方向に見て同一位置に形成されており、切り欠き部３８が連なって空気溝を形成している。この空気溝３８は、インク等の表面張力により液膜の出来る最大溝幅よりも大きく出来ている。
外気との間では、前記空気孔３０と切り欠き部３８の連なった空気溝を経由して前記薄板部材１６，１６…間のインク貯留溝１８に外気が導入・導出するようになっている。
【００２１】
また、参考例３のインク保溜装置は、図５に示すように、薄板部材１６，１６…の断面が円形でなく隅を切り落としたごとき異形であり、第１、第２の保持部材３２，３４では薄板部材１６，１６…間隔の保持が困難なときでも、副保持部材３６を形成して対応し支持できる。
【００２２】
そして、参考例４のインク保溜装置では、図６に示すように、保持部材３２先端および中途から直角方向（金型抜き方向）に枝分かれした形状の副保持部材３６、４０を設けている。
また、実施形態、参考例２〜４の副保持部材３６、４０も金型の割後退方向に沿った（Ｌ２に平行）凹部で形成するので、射出成形に際して、割型の後退に抵抗を生じることなく成形できるものになる。
【００２３】
なお、本発明は、前記の実施形態に限定されず、例えば、割面が直線Ｌ１に沿っているので、保持部材は直線的であったが、この他、異形の割面の時には、その異形に沿う形状にするのが好適である。
【００２４】
【発明の効果】
以上説明したとおり、本発明によれば、インクあるいは塗布液保溜装置において、薄板部材同士の間隔を保持部材で保持できるため、薄板部材を厚くしなくても強度を保って広い面積にでき、インクあるいは塗布液保溜量を増大できる。
また、前記薄板部材には、その外周縁から副保持部材と軸部間に先端が位置するように、切り欠き部を設けるので、十分な断面の空気通路を形成できる。
また、本発明のインクあるいは塗布液保溜装置の製造方法によれば、少なくとも軸部と保持部材は、二つ割の金型を用いて一体に射出成形するものであって、軸部と対の第１保持部材は金型の合わせ面上の凹部で形成すると共に、対の第２保持部材は金型の割後退方向に沿った凹部で形成した。これによって、射出成形に際して、割型の後退に抵抗を生じることなく成形できるものになる。
また、副保持部材は金型の割後退方向に沿った凹部で形成するので、射出成形に際して、割型の後退に抵抗を生じることなく成形できるものになる。
【図面の簡単な説明】
【図１】実施形態にかかるインク保溜装置を備えた一例の筆記具の縦断面図である。
【図２】図１のＡ−Ａ線に沿って横断面視した参考例１のインク保溜装置の説明図である。
【図３】同じくＡ−Ａ線に沿って横断面視した参考例２のインク保溜装置の説明図である。
【図４】同じくＡ−Ａ線に沿って横断面視した実施形態のインク保溜装置の説明図である。
【図５】同じくＡ−Ａ線に沿って横断面視した参考例３のインク保溜装置の説明図である。
【図６】同じくＡ−Ａ線に沿って横断面視した参考例４のインク保溜装置の説明図である。
【図７】従来のインク保溜装置の横断面図である。
【符号の説明】
１２インク保溜装置
１６薄板部材
１８インク保溜溝
２０インク誘導溝
２２中空筒状部
３２，３４保持部材
３６，４０副保持部材
３８切り欠き部[0001]
BACKGROUND OF THE INVENTION
The present invention provides an ink or coating liquid storage device that is provided in an ink or coating liquid using tool such as a writing instrument or a coating tool, and temporarily stores the ink or coating liquid in accordance with a change in pressure in a tank, and a method for manufacturing the same. About.
[0002]
[Prior art]
There is a writing instrument having an ink storage device that temporarily stores ink according to a change in pressure in the ink tank. Generally, in writing instruments, as shown in Japanese Utility Model Publication No. 58-21474, etc., a temporary ink storage device is built in front of the ink tank. That is, a plurality of disc-shaped thin plate portions are arranged at intervals in the shaft. Ink storage devices called so-called bellows are provided, which are arranged in a comb-like cross section and temporarily store ink in the gaps between the thin plate portions.
[0003]
In the temporary ink storage device used for such a writing instrument, as shown in a cross-sectional view in FIG. 7, a plurality of disk-shaped thin plate portions a are stacked, and a gap between the overlapping thin plate portions a is used as an ink storage groove. In addition, a notch d is provided in a direction perpendicular to the center line c, and the notch d is used as an air groove connecting the ink storage groove and the outside air.
In addition, in FIG. 7, the code | symbol e is a cross-sectional view of the common base part (shaft part) of the some thin plate member a, and the hole part which penetrates the ink relay core f is formed in the inside. In addition, g is an ink conduction groove (slit) that conducts ink from an ink tank (not shown) in communication with the ink storage groove.
[0004]
[Problems to be solved by the invention]
However, in the conventional ink or coating liquid storage device, if the area of the disk-shaped thin plate portion is increased in order to increase the amount of ink or coating liquid storage, the strength of the thin plate portion may be weakened. On the other hand, when the thin plate portion is formed thick, the number of the retaining grooves is reduced, and the ink or coating liquid retaining amount is eventually reduced.
[0005]
The present invention has been made in view of the above-described conventional problems, and can achieve a large area while maintaining the strength without increasing the thickness of the thin plate member, and can increase the ink or coating liquid storage amount. It is an object of the present invention to provide a storage device and a manufacturing method thereof.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention is provided in a tool for using ink or a coating liquid such as a writing instrument and an applicator,
Resin-made ink or coating liquid storage device having a structure in which a plurality of thin plate members are stacked with a gap between each other, and ink or coating liquid is temporarily stored in the gap according to a pressure change in the tank In
Forming a shaft portion that supports the plurality of thin plate members connected together;
The first holding member and two pairs of holding members made of a second holding member for holding an interval of the gap is provided in the gap, toward the thin plate member outer peripheral edge from the shaft portion a schematic plate, and, Forming the first holding member and the second holding member so as to be perpendicular to each other;
A sub-holding member that is provided in the gap and holds the gap is formed so as to extend from the first holding member in a direction substantially perpendicular to the first holding member and parallel to the second holding member,
One of the second holding members is formed with a slit for guiding ink or coating liquid between the thin plate members from the outer peripheral edge of the thin plate member to the second holding member. It has a configuration of an ink or coating liquid storing device characterized in that a notch portion is provided so that the tip is positioned between the holding member and the shaft portion .
According to the present invention, since the interval between the thin plate members can be held by the holding member, the strength can be maintained and the area can be increased without increasing the thickness of the thin plate member, and the ink or coating liquid storage amount can be increased.
[0007]
If a plurality of pairs of holding members are formed, the thin plate member can be supported at a plurality of locations or at a large number of locations, and the gaps can be more reliably maintained.
[0008]
Moreover, it reliably hold the spacing of the sub-retaining member provided Runode more the gap together with the holding member in said gap. Since the sub-holding member is formed so as to extend from the first holding member (only the tip or only in the middle and both) in the substantially perpendicular direction , the gap can be held finely and reliably. Further, even when the thin plate member has a non-circular cross-section and cannot be held by the holding member, a large number of auxiliary holding members can be formed and supported.
In addition , since one of the holding members forms a slit for guiding ink or coating liquid between the thin plate members (sheets), the slit forming portion of the thin plate member can be supported by the holding member, The accuracy at the time of injection molding can be maintained by increasing the rigidity of the portion.
In addition, since the thin plate member is provided with the notch portion so that the tip is located between the sub-holding member and the shaft portion from the outer peripheral edge, an air passage having a sufficient cross section can be formed.
The present invention is provided in a tool for using ink or coating liquid such as a writing instrument and an applicator,
A plurality of thin plate members are stacked with a gap between them, and this is changed according to the pressure change in the tank.
In the manufacturing method of the resin-made ink or coating liquid storage device having a structure for temporarily storing the ink or the coating liquid in the gap,
A shaft portion that connects and supports the plurality of thin plate members, and two pairs of holding members that are provided in the gap and hold a gap between the gaps are formed in a substantially plate shape. Thus, injection molding is integrally performed by using a two-part mold so that the shaft portion is directed to the outer peripheral edge of the thin plate member and the first holding member and the second holding member are oriented in the vertical direction. The first holding member paired with the shaft portion is formed by a recess on the mating surface of the mold,
The second holding member is formed with a recess along the mold retreating direction of the mold, and a sub-holding member that is provided in the gap and holds the gap is substantially perpendicular to the first holding member. Forming a recess along the splitting direction of the mold so as to extend parallel to the second holding member;
One of the second holding members is a slit that guides ink or coating liquid between the thin plate members, and the slit of the second holding member is split from the outer peripheral edge of the thin plate member along the retreating direction. An ink or coating liquid storage device characterized in that the thin plate member is provided with a notch portion so that a tip is located between the sub-holding member and the shaft portion from the outer peripheral edge of the thin plate member. Is the method.
According to the method for manufacturing an ink or coating liquid storage device of the present invention, at least the shaft portion and the holding member are integrally injection-molded using a two-part mold, The one holding member was formed by a recess on the mating surface of the mold, and the pair of second holding members was formed by a recess along the mold retreating direction of the mold. Thus, in injection molding, molding can be performed without causing resistance to the retreat of the split mold .
Further, since the sub-holding member is formed by a recess along the mold retreating direction of the mold, it can be formed without causing resistance to retreat of the split mold at the time of injection molding.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an example of a writing instrument provided with a storage device for ink or coating liquid (hereinafter referred to as ink) according to the embodiment, and FIG. 2 is a reference example viewed in cross section along the line AA. illustration of the first ink Hotamari device, FIG. 3 also illustrates an ink Hotamari device of reference example 2 was cross-sectional view along the line a-a cross section along the 4 same line a-a illustration of an ink Hotamari device viewing the embodiment, FIG. 5 is also explanatory view of an ink Hotamari device of reference example 3 was cross-sectional view along the line a-a, Fig. 6 is also along the line a-a FIG. 10 is an explanatory diagram of an ink storage device of Reference Example 4 as viewed in cross section. In each embodiment, the same code | symbol is attached | subjected to the common part.
[0010]
The ink storage device is provided in the writing instrument of FIG. 1 (or an ink use tool such as an applicator). In the case of the embodiment, a plurality of thin plate members 16, 16... The resin ink storage device 12 has a structure in which the ink storage grooves 18 are temporarily stacked in accordance with the pressure change in the ink tank 10.
[0011]
The ink storage device 12 has a thick disc-like rear end portion 12a outer periphery fitted to the shaft tube 14 and is formed in a watertight manner. The front end portion of the rear end portion 12a has a thin disc-like thin plate member 16. In this structure, a plurality of thin plate members (blade-shaped sheets in the embodiment) 16, 16... Constitute an ink retaining groove (lateral groove) 18 for storing ink by capillary force. is there.
[0012]
Each thin plate member 16 is formed with a slit-shaped ink guide groove (vertical groove) 20 in a direction perpendicular to the center of the shaft cylinder 14. The groove width of the ink guide groove (longitudinal groove) 20 is smaller than any groove width of the ink reservoir groove 18 and is always filled with ink, so that excess ink when the pressure in the ink tank 10 rises is retained in the ink. It can be immediately supplied to the reservoir groove (lateral groove) 18. The ink guide groove 20 is formed over each thin plate member 16 and continuously formed in the opening groove 12b into the ink tank 10 in the rear end portion 12a. The opening groove 12b in the rear end portion 12 is constant. The ink tank 10 is formed in such a width that the capillary force can be obtained.
[0013]
In the ink storage device 12, the laminated thin plate members 16 have a structure in which the central portion is fixedly supported by the hollow cylindrical portion 22. In this hollow cylindrical portion (corresponding to the shaft portion) 22, there is a relay core 24 made of a resin molded product, a fiber bundle or the like, and the ink in the ink tank 10 is arranged at the tip end of the shaft tube 14 by the relay core 24. It is supplied to the pen tip 26 provided.
An air hole 30 is formed in the holder 28 that fixes and holds the pen tip 26 at the tip of the shaft tube 14, and communicates with the outside and the ink storage device 12 in the shaft tube 14 in parallel with the pen tip 26.
[0014]
The laminated thin plate members 16 are connected to and supported by the hollow cylindrical portion 22 in the ink storage device 12, and the interval between them (the interval between the ink storage grooves 18) is held.
[0015]
Further, in Reference Example 1 , as shown in FIG. 2, two pairs of holding members 32 and 34 that hold the interval between the storage grooves 18 (gap) are provided in the ink storage grooves 18. This is formed on the radiations L1 and L2 perpendicular to each other from 22 toward the outer peripheral edge of the thin plate member 16. The ink guide groove 20 includes a plurality of thin plate members 16, 16, and one holding member 32 in a radial direction from the central axis toward the outer peripheral edge of the thin plate members 16, 16. Are formed in a narrow groove in common.
[0016]
The holding members extend in a narrow and tapered rod shape in a cross-sectional view of the ink storage device, but two pairs of holding members 32 and 34 disposed and formed between the plurality of thin plate members 16 and 16. Are substantially plate-shaped so as to penetrate through the thin plate members 16, 16... When viewed together along the hollow cylindrical portion 22, and these schematic plates radiate at an angle of 90 degrees from the hollow cylindrical portion 22. Standing in the direction.
Further, the holding members 32 and 34 are formed with a length at least 1/3 or more of the radius of the disk-shaped thin plate members 16, 16... To reinforce the thin plate members 16, 16. 12 is increased to prevent the interval between the ink retaining grooves 18 from changing.
In the ink storage device 12 of the embodiment, the holding members 32, 34 and the thin plate members 16, 16,... Are integrally formed. Thereby, the ink guide groove forming portion of the thin plate members 16, 16... Can be supported by the holding member, and the rigidity of the portion can be increased and the accuracy at the time of injection molding can be maintained.
One of the holding members 32, 34 (one of the 34 in the embodiment) is formed with an ink guide groove 20 for guiding ink between the thin plate members 16, 16,. Thereby, the ink guide groove 20 formation location of the thin plate members 16, 16,... Can be supported by the holding member, and the rigidity of the location can be increased and the accuracy at the time of injection molding can be maintained.
[0017]
In Reference Example 1 , the distance between the thin plate members 16, 16... Can be held by the holding members 32, 34 together with the hollow cylindrical portion 22, so that the strength is kept wide even if the thin plate members 16, 16. The ink storage amount can be increased. Further, since a plurality of pairs of holding members (two first holding members 32 and second holding members 34 in Reference Example 1 ) are formed, the thin plate members 16, 16,... Thus, the interval between the ink retaining grooves 18 can be more reliably maintained.
[0018]
Here, the hollow cylindrical portion 22 and the holding members 32 and 34 are integrally injection-molded using a split mold, and the hollow cylindrical portion 32 and the pair of first holding members 32 are It is formed by a recess on a mating surface (matched with L1) of a mold (not shown). The pair of second holding members 34 is formed by a recess along the splitting direction (parallel to L2) of the mold. As described above, in the injection molding, the mold can be molded without causing a punching resistance when the split mold is retracted.
[0019]
An ink storage device according to Reference Example 2 will be described. In this ink storage device, as shown in FIG. 3, holding members 32, 34 are provided in the gaps 18 of the thin plate members 16, 16. 36 is provided. According to this configuration, the interval between the ink retaining grooves 18 can be more reliably maintained than in the first reference example.
The sub-holding member 36 is preferably formed so as to extend in a substantially perpendicular direction from the first holding member (only at the tip or in the middle and both). The gap can be kept finely and reliably.
[0020]
As shown in FIG. 4, the ink storage device according to the embodiment includes holding members 32 and 34 in the gap 18 and a sub-holding member 36 having a shape branched in a direction perpendicular to the tip of one holding member 32. the common reference example 2 at a point, further, the thin plate members 16, 16, such that the tip of outer peripheral edge thereof between the sub-holding member 36 and the hollow cylindrical portion 22 is positioned, provided with a cutout portion 38 Is. The notch 38 can form an air passage having a sufficient cross section. In the laminated thin plate members 16, 16..., The respective cutout portions 38 are formed at the same position when viewed in the axial direction, and the cutout portions 38 are connected to form an air groove. The air groove 38 is made larger than the maximum groove width that can be formed by a liquid film due to the surface tension of ink or the like.
Between the outside air, outside air is introduced and led out to the ink storage groove 18 between the thin plate members 16, 16... Via the air groove where the air hole 30 and the notch 38 are connected.
[0021]
Further, as shown in FIG. 5, the ink storage device of Reference Example 3 has a thin cross section of the thin plate members 16, 16. 34, even when it is difficult to hold the thin plate members 16, 16,..., The sub-holding member 36 can be formed and supported.
[0022]
In the ink storage device of Reference Example 4 , as shown in FIG. 6, sub-holding members 36 and 40 having a shape branched in the direction perpendicular to the tip of the holding member 32 and in the middle (molding direction) are provided.
In addition, since the auxiliary holding members 36 and 40 of the embodiments and reference examples 2 to 4 are also formed by recesses along the mold retreating direction (parallel to L2), resistance to retraction of the split mold occurs during injection molding. It can be molded without any problems.
[0023]
The present invention is not limited to the above-described embodiment . For example, since the split surface is along the straight line L1, the holding member is linear. It is preferable to make the shape along
[0024]
【The invention's effect】
As described above, according to the present invention, in the ink or coating liquid storage device, the interval between the thin plate members can be held by the holding member, so that the strength can be kept large without increasing the thickness of the thin plate member, Ink or coating liquid storage amount can be increased.
In addition, since the thin plate member is provided with the notch portion so that the tip is located between the sub-holding member and the shaft portion from the outer peripheral edge, an air passage having a sufficient cross section can be formed.
Further, according to the method for manufacturing the ink or coating liquid storage device of the present invention, at least the shaft portion and the holding member are integrally formed by injection using a two-part mold, The first holding member was formed by a recess on the mating surface of the mold, and the pair of second holding members was formed by a recess along the mold retreating direction of the mold. Thus, in injection molding, molding can be performed without causing resistance to the retreat of the split mold .
Further, since the sub-holding member is formed by a recess along the mold retreating direction of the mold, it can be formed without causing resistance to retreat of the split mold at the time of injection molding.
[Brief description of the drawings]
FIG. 1 is a vertical cross-sectional view of an example writing instrument including an ink storage device according to an embodiment.
FIG. 2 is an explanatory diagram of an ink storage device of Reference Example 1 as viewed in cross section along the line AA in FIG. 1;
FIG. 3 is an explanatory view of an ink storage device of a reference example 2 as viewed in a transverse section along the line AA.
FIG. 4 is an explanatory view of the ink storage device according to the embodiment , similarly viewed from the cross-section along the line AA.
FIG. 5 is an explanatory view of an ink storage device of a reference example 3 similarly viewed in a cross section along the line AA.
FIG. 6 is an explanatory diagram of an ink storage device of a reference example 4 similarly viewed in cross section along the line AA.
FIG. 7 is a cross-sectional view of a conventional ink storage device.
[Explanation of symbols]
12 Ink Reserving Device 16 Thin Plate Member 18 Ink Reserving Groove 20 Ink Guide Groove 22 Hollow Cylindrical Parts 32, 34 Holding Member 36, 40 Sub Holding Member 38 Notch

Claims

It is provided for the use of ink or application liquid such as writing instruments and applicators,
Resin-made ink or coating liquid storage device having a structure in which a plurality of thin plate members are stacked with a gap between each other, and ink or coating liquid is temporarily stored in the gap according to a pressure change in the tank In
Forming a shaft portion that supports the plurality of thin plate members connected together;
Two pairs of holding members made up of a first holding member and a second holding member, which are provided in the gap and hold the gap, are substantially plate-shaped and are directed from the shaft portion toward the outer peripheral edge of the thin plate member, and Forming the first holding member and the second holding member so as to be perpendicular to each other;
A sub-holding member that is provided in the gap and holds the gap is formed so as to extend from the first holding member in a direction substantially perpendicular to the first holding member and parallel to the second holding member,
One of the second holding members is formed with slits for guiding ink or coating liquid between the thin plate members from the outer peripheral edge of the thin plate member to the second holding member,
An ink or coating liquid storage device, wherein the thin plate member is provided with a notch portion so that a tip is located between the sub-holding member and the shaft portion from the outer peripheral edge thereof.

It is provided for the use of ink or application liquid such as writing instruments and applicators,
Resin-made ink or coating liquid storage device having a structure in which a plurality of thin plate members are stacked with a gap between each other, and ink or coating liquid is temporarily stored in the gap according to a pressure change in the tank In the manufacturing method of
A shaft portion that connects and supports the plurality of thin plate members, and two pairs of holding members that are provided in the gap and hold a gap between the gaps are formed in a substantially plate shape. Thus, injection molding is integrally performed by using a two-part mold so that the shaft portion is directed to the outer peripheral edge of the thin plate member and the first holding member and the second holding member are oriented in the vertical direction. The first holding member paired with the shaft portion is formed by a recess on the mating surface of the mold,
The second holding member is formed with a recess along the mold retreating direction of the mold, and a sub-holding member that is provided in the gap and holds the gap is substantially perpendicular to the first holding member. Forming a recess along the splitting direction of the mold so as to extend parallel to the second holding member;
One of the second holding members is a slit that guides ink or coating liquid between the thin plate members, and the slit of the second holding member is split from the outer peripheral edge of the thin plate member along the retreating direction. Forming with mold,
The thin plate member is provided with a notch portion so that a tip is located between the sub-holding member and the shaft portion from the outer periphery of the thin plate member.