JP4532233B2 - Ballpoint pen tip and manufacturing method thereof - Google Patents

Ballpoint pen tip and manufacturing method thereof Download PDF

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JP4532233B2
JP4532233B2 JP2004307707A JP2004307707A JP4532233B2 JP 4532233 B2 JP4532233 B2 JP 4532233B2 JP 2004307707 A JP2004307707 A JP 2004307707A JP 2004307707 A JP2004307707 A JP 2004307707A JP 4532233 B2 JP4532233 B2 JP 4532233B2
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metal thin
thin tube
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pen tip
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JP2006116841A (en
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久敏 澁谷
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Zebra Co Ltd
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Description

本発明は、金属細管を用いて形成されるボールペンチップ及びその製造方法に関する。
詳しくは、金属細管の先端内周にボール受け座を突出させ、金属細管の先端外周を内方へ押圧変形させてボール受け座に転写ボールを回転自在に抱持するボールペンチップ、及び、金属細管の先端内周に突出するボール受け座に向けて転写ボールを挿入した後に、この金属細管の先端外周を内方へ押圧変形させて転写ボールを回転自在に抱持するボールペンチップの製造方法に関する。 The present invention relates to a ballpoint pen tip formed using a metal thin tube and a method for manufacturing the same.
Specifically, a ball-point pen tip that protrudes from the inner periphery of the tip of the metal thin tube, presses and deforms the outer periphery of the metal thin tube inward, and rotatably holds the transfer ball on the ball receiver, and the metal thin tube The present invention relates to a ballpoint pen tip manufacturing method in which a transfer ball is inserted toward a ball receiving seat protruding toward the inner periphery of the tip of the metal tube, and then the outer periphery of the tip of the metal thin tube is pressed and deformed inward to hold the transfer ball rotatably.

従来、この種のボールペンチップ及びその製造方法として、金属細管の先端を絞り加工で小径に絞り、その小径に絞った部分の外周を先細に切削したテーパー部を形成すると共に、その内周を切削してボールハウスを形成した後に、このボールハウスの底面から金属細管の後端へ向けブローチ加工することでインク誘導溝を形成し、そして、ボールハウスに転写ボールを挿入してから、前記テーパー部の先端をカシメ加工して内方に押圧変形することにより、該カシメ部とボールハウスの残った底面からなるボール受け座とで転写ボールを脱落することなく回転自在に抱持するものがある（例えば、特許文献１参照）。
また、金属細管の先端近傍において周方向の複数箇所を外面から内方に押圧変形することにより、複数の内方突出部を形成して夫々ボール受け座とすると共に、これら内方突出部の間をインク誘導溝とし、そして、これら内方突出部に転写ボールを装着した後、該金属細管の先端口縁をカシメ加工して内方に押圧変形することにより、転写ボールを抱持するものもある（例えば、特許文献２参照）。 Conventionally, as a ballpoint pen tip of this type and its manufacturing method, the tip of a metal thin tube is drawn to a small diameter by drawing, and a tapered portion is formed by tapering the outer periphery of the portion narrowed to the small diameter, and the inner periphery is cut. After forming the ball house, an ink guide groove is formed by broaching from the bottom surface of the ball house to the rear end of the metal thin tube, and after the transfer ball is inserted into the ball house, the taper portion There is a type in which the transfer ball is rotatably held without falling off by the crimping portion and the ball receiving seat formed of the remaining bottom surface of the ball house by crimping the tip of the ball and deforming it inwardly ( For example, see Patent Document 1).
In addition, by pressing and deforming a plurality of locations in the circumferential direction inward from the outer surface in the vicinity of the tip of the metal thin tube, a plurality of inward protruding portions are formed as ball receiving seats, and between the inward protruding portions. Ink guide grooves, and after mounting the transfer balls on these inwardly projecting portions, the tip edge of the metal thin tube is crimped and pressed inward to hold the transfer balls. (For example, refer to Patent Document 2).

しかし乍ら、このような従来のボールペンチップ及びその製造方法によれば、特許文献１の場合、金属細管の先端を絞ってボール受け座を形成してからインク誘導溝を溝切りするが、特に直径０．３ｍｍ未満のような極小ボールを抱持する際には、ボール受け座及びインク誘導溝の小型化と高い寸法精度が要求されるものの、先端絞りと溝切りを別個に形成するため、位置ズレなどが発生し易くて精度に優れた極小ボールペンチップを安定して提供できないという問題があった。
更に、ボール受け座を形成するための絞り加工と、インク誘導溝を溝切りするためのブローチ加工が必要なため、工程数が多くなって、製造に時間と手間がかかると共に、別々の専用工具が必要になって、コスト高になるという問題があった。
また、特許文献２の場合には、ボール受け座とインク誘導溝を同時に形成するために周方向へ複数箇所を押圧加工するが、この押圧加工は、例えば金属細管の材料が僅かに変化しただけでも複数箇所の突出位置が微妙に位置ズレを起こして不均一となり易く、その他にも押圧部材の形状や精度の管理の難しいやスプリングバックの問題などの理由で加工精度を上げることが困難で、ボール受け座として利用可能な精度まで至らず、その結果として転写ボールを安定して抱持できないだけでなく、インクボテの原因になるという問題があった。
特開２００３−２５１９７８号公報（第１−５頁、図１−８） 特開平１１−１６５４８５号公報（第２頁、図４−図６） However, according to the conventional ballpoint pen tip and the manufacturing method thereof, in the case of Patent Document 1, the tip of the metal thin tube is squeezed to form the ball receiving seat, and then the ink guide groove is grooved. When holding a very small ball having a diameter of less than 0.3 mm, the ball receiving seat and the ink guide groove are required to be small in size and high dimensional accuracy. There has been a problem that it is difficult to stably provide a miniature ball-point pen tip that is liable to cause misalignment and is excellent in accuracy.
Furthermore, drawing processing for forming the ball receiving seat and broaching processing for grooving the ink guide groove are required, which increases the number of processes, takes time and labor for manufacturing, and separate dedicated tools. However, there was a problem that the cost was high.
In the case of Patent Document 2, a plurality of locations are pressed in the circumferential direction in order to form the ball receiving seat and the ink guide groove at the same time. For example, the material of the metal thin tube is slightly changed. However, it is difficult to raise the processing accuracy due to the difficulty of managing the shape and accuracy of the pressing member and the problem of spring back, etc. The accuracy that can be used as a ball seat is not reached, and as a result, there is a problem that not only can the transfer ball be stably held, but also an ink spot is caused.
Japanese Patent Laying-Open No. 2003-251978 (page 1-5, FIG. 1-8) JP-A-11-165485 (second page, FIGS. 4 to 6)

本発明は、上記従来事情に鑑みてなされたもので、その課題とするところは、寸法精度が高くて小型化が容易な構造のボールペンチップを提供することにある。   The present invention has been made in view of the above-described conventional circumstances, and an object thereof is to provide a ball-point pen tip having a structure with high dimensional accuracy and easy size reduction.

上記課題を解決するために、第一の発明では、金属細管の先端内周にボール受け座を突出させ、金属細管の先端外周を内方へ押圧変形させてボール受け座に転写ボールを回転自在に抱持するボールペンチップにおいて、上記金属細管の内周面に、該金属細管の軸方向の略全長に亘って延びる突起を周方向へ適宜間隔毎に複数設け、これら突起先端の内径を転写ボールの外径よりも小さくし、前記金属細管の先端内周にボールハウスを形成すると共に、前記突起の先端にボール受け座を形成したことを特徴とする。
また、第二の発明では、上記第一の発明の構成に加えて、上記突起を金属細管の内周面に周方向へ等間隔毎に３つ突設したことを特徴とする。
そして、第三の発明では、金属細管の先端内周に突出するボール受け座に向けて転写ボールを挿入した後に、この金属細管の先端外周を内方へ押圧変形させて転写ボールを回転自在に抱持するボールペンチップの製造方法において、上記金属細管の軸方向の略全長に亘って延びる突起が周方向へ適宜間隔毎に複数突設された金属細管の先端内周を切削加工して、該金属細管の先端内周面にボールハウスを形成すると共に、前記突起の先端にボール受け座を形成したことを特徴とする。
また、第四の発明では、上記第三の発明の構成に加えて、上記突起が適宜間隔毎に複数夫々平行に形成された平板を円筒状に丸めて金属細管を作ったことを特徴とする。
また、第五の発明では、上記第三又は第四の発明の構成に加えて、上記金属細管として、突起の間隔が異なる複数種類を用意したことを特徴とする。 In order to solve the above-described problems, in the first invention, a ball receiving seat protrudes from the inner periphery of the tip of the metal thin tube, and the outer periphery of the tip of the metal thin tube is pressed and deformed inward to allow the transfer ball to rotate freely on the ball receiving seat. A plurality of protrusions extending substantially along the axial length of the metal thin tube at appropriate intervals in the circumferential direction on the inner peripheral surface of the metal thin tube. The ball house is formed on the inner periphery of the tip of the metal thin tube, and the ball receiving seat is formed on the tip of the protrusion.
The second invention is characterized in that, in addition to the structure of the first invention, three protrusions are provided on the inner peripheral surface of the metal thin tube at regular intervals in the circumferential direction.
In the third invention, after the transfer ball is inserted toward the ball seat that protrudes to the inner periphery of the tip of the metal thin tube, the transfer ball can be rotated by pressing and deforming the outer periphery of the tip of the metal thin tube inward. In the manufacturing method of the ball-point pen tip to be held, the inner periphery of the tip of the metal thin tube in which a plurality of protrusions extending over substantially the entire length in the axial direction of the metal thin tube protrudes at appropriate intervals in the circumferential direction is cut and processed. A ball house is formed on the inner peripheral surface of the tip of the metal thin tube, and a ball receiving seat is formed on the tip of the projection.
The fourth invention is characterized in that, in addition to the configuration of the third invention, a metal thin tube is formed by rounding a flat plate in which a plurality of the protrusions are formed in parallel at appropriate intervals into a cylindrical shape. .
The fifth invention is characterized in that, in addition to the configuration of the third or fourth invention, a plurality of types having different protrusion intervals are prepared as the metal thin tube.

本発明は、上記構成により下記の作用効果を奏する。
第一の発明によれば、金属細管の内周面に、該金属細管の軸方向の略全長に亘って延びる突起を周方向へ適宜間隔毎に複数設け、これら突起先端の内径を転写ボールの外径よりも小さくし、前記金属細管の先端内周にボールハウスを形成すると共に、前記突起の先端にボール受け座を形成することにより、金属細管の後端から内周面の突起沿いに軸方向へ流れるインクが、各突起間のインク誘導溝を通ってボールハウスへ供給される。
従って、寸法精度が高くて小型化が容易な構造のボールペンチップを提供することができる。
よって、ボール受け座とインク誘導溝を別々形成する従来技術と比べ、ボール受け座及びインク誘導溝の小型化と高い寸法精度が達成できて、極小ボールペンチップを安定して提供できる。
更に、金属細管の軸方向へ突起が連続して突出するため、金属細管に充填されたインクを整流しつつボールハウスへ供給すると共に、毛細管現象によりスムーズなインク供給が図れる。 The present invention has the following effects by the above configuration.
According to the first invention, on the inner peripheral surface of the metal thin tube, a plurality of protrusions extending substantially in the axial direction of the metal thin tube are provided at appropriate intervals in the circumferential direction, and the inner diameters of the tips of the protrusions are set to the transfer ball. By forming a ball house on the inner periphery of the tip of the metal thin tube, and making a ball receiving seat on the tip of the projection, the shaft extends from the rear end of the metal thin tube along the projection on the inner peripheral surface. The ink flowing in the direction is supplied to the ball house through the ink guide groove between the protrusions.
Therefore, it is possible to provide a ballpoint pen tip having a structure with high dimensional accuracy and easy size reduction.
Therefore, compared with the prior art in which the ball receiving seat and the ink guiding groove are separately formed, the ball receiving seat and the ink guiding groove can be miniaturized and high dimensional accuracy can be achieved, and a minimal ballpoint pen tip can be provided stably.
Further, since the protrusions continuously protrude in the axial direction of the metal thin tube, the ink filled in the metal thin tube is supplied to the ball house while being rectified, and a smooth ink supply can be achieved by a capillary phenomenon.

第二の発明によれば、突起を金属細管の内周面に周方向へ等間隔毎に３つ突設することにより、各突起の先端に、ボール受け座となる切削端面とインク誘導溝が交互に周方向へ等間隔毎に３つずつ形成される。
従って、インク誘導溝のスペースを十分に確保しながら転写ボールを安定して抱持することができる。 According to the second invention, by providing three protrusions at equal intervals in the circumferential direction on the inner peripheral surface of the metal thin tube, a cutting end surface serving as a ball receiving seat and an ink guide groove are formed at the tip of each protrusion. Three are formed alternately at equal intervals in the circumferential direction.
Therefore, the transfer ball can be stably held while ensuring a sufficient space for the ink guide groove.

第三の発明によれば、金属細管の軸方向の略全長に亘って延びる突起が周方向へ適宜間隔毎に複数突設された金属細管の先端内周を切削加工するだけで、この金属細管の先端内周面にはボールハウスが形成され、前記突起の先端にはボール受け座が形成されると共に、これら突起間の凹溝がインク誘導溝となる。
従って、加工工程数を減らしながら加工精度が優れたボールペンチップの製造方法を提供することができる。
よって、ボール受け座を形成するための絞り加工と、インク誘導溝を溝切りするためのブローチ加工が必要な従来技術と比べ、製造に時間と手間がかからないと共に、一つの工具で良いから製造コストの大幅な低減化が図れる。 According to the third aspect of the present invention, only by cutting the inner periphery of the tip of the metal thin tube in which a plurality of protrusions extending over substantially the entire length in the axial direction of the metal thin tube are provided at appropriate intervals in the circumferential direction, A ball house is formed on the inner peripheral surface of the tip, a ball receiving seat is formed on the tip of the projection, and a concave groove between these projections becomes an ink guide groove.
Therefore, it is possible to provide a ballpoint pen tip manufacturing method with excellent processing accuracy while reducing the number of processing steps.
Therefore, compared to the conventional technology that requires drawing to form the ball seat and broaching to cut the ink guide groove, the manufacturing cost is less and the manufacturing cost is reduced because only one tool is required. Can be greatly reduced.

第四の発明によれば、突起が適宜間隔毎に複数夫々平行に形成された平板を円筒状に丸めて金属細管を作ることにより、完成した金属細管の内周面に、該金属細管の軸方向の略全長に亘って延びる突起が周方向へ適宜間隔毎に複数配置される。
従って、金属細管が小径であっても突起を正確でしかも確実に突出させることができる。 According to the fourth aspect of the present invention, a metal thin tube is produced by rounding a flat plate having a plurality of projections formed in parallel at appropriate intervals into a cylindrical shape, thereby forming a shaft of the metal thin tube on the inner peripheral surface of the completed metal thin tube. A plurality of protrusions extending over substantially the entire length in the direction are arranged at appropriate intervals in the circumferential direction.
Therefore, even if the metal thin tube has a small diameter, the projection can be accurately and reliably projected.

第五の発明によれば、金属細管として突起の間隔が異なる複数種類を用意することにより、これらを同じ切削加工するだけで、インク誘導溝の断面積が異なる複数種類のボールペンチップが製造される。
従って、インク粘度に合わせて最適なインク供給量のボールペンチップを同じ加工で得ることができる。 According to the fifth invention, by preparing a plurality of types of metal thin tubes having different projection intervals, a plurality of types of ball-point pen tips having different cross-sectional areas of the ink guide grooves can be manufactured simply by cutting them. .
Accordingly, it is possible to obtain a ball-point pen tip having an optimum ink supply amount in accordance with the ink viscosity by the same processing.

本発明のボールペンチップＡは、図１〜図６に示す如く、そのチップ本体として所定長さの金属細管１を用い、この金属細管１の内周面には、予め軸方向の略全長に亘って延びる突起２か又は凹溝３を周方向へ適宜間隔毎に複数夫々設け、これら突起２の先端に亘る内径を転写ボール４の外径よりも小さく設定しておき、その後加工で、該金属細管１の先端内周を切削加工することで、その先端内周面には、ボールハウス５′となる環状切削面５を形成すると共に、前記突起２の先端には、ボール受け座６′となる切削端面６を形成し、これら突起２の間にはインク誘導溝３が同時に形成される。   As shown in FIGS. 1 to 6, the ballpoint pen tip A of the present invention uses a metal thin tube 1 having a predetermined length as the tip body, and the inner peripheral surface of the metal thin tube 1 has a substantially entire length in the axial direction in advance. A plurality of protrusions 2 or concave grooves 3 extending in the circumferential direction are provided at appropriate intervals in the circumferential direction, and the inner diameter of the protrusions 2 is set to be smaller than the outer diameter of the transfer ball 4. By cutting the inner periphery of the tip of the thin tube 1, an annular cutting surface 5 serving as a ball house 5 ′ is formed on the inner peripheral surface of the tip, and a ball receiving seat 6 ′ is formed on the tip of the protrusion 2. A cutting end face 6 is formed, and an ink guide groove 3 is simultaneously formed between the protrusions 2.

そして、このボールペンチップＡは、金属細管１の先端内周に突出したボール受け座６′に向けて転写ボール４を挿入した後に、この金属細管１の先端外周を内方へ押圧変形させることで転写ボール４が回転自在に抱持される。
以下、本発明の各実施例を図面に基づいて説明する。 And this ball-point pen tip A inserts the transfer ball 4 toward the ball receiving seat 6 ′ protruding to the inner periphery of the tip of the metal thin tube 1, and then presses and deforms the outer periphery of the tip of the metal thin tube 1 inward. The transfer ball 4 is rotatably held.
Embodiments of the present invention will be described below with reference to the drawings.

この実施例１は、図１〜図４に示す如く、金属細管１の先端内周に突起２と凹溝３を周方向へ等間隔毎に３本ずつ交互に一体成形し、これら突起２を金属細管１の中心軸へ向け断面略半円形状に突出させて、これら突起２の周方向幅寸法よりと凹溝３の周方向幅寸法が略同じ長さか、或いは凹溝３の周方向幅寸法の方が若干長い場合を示すものである。   In this embodiment, as shown in FIGS. 1 to 4, three protrusions 2 and three concave grooves 3 are alternately formed on the inner periphery of the tip of the metal thin tube 1 at equal intervals in the circumferential direction. Projecting in a semicircular cross section toward the central axis of the metal thin tube 1, the circumferential width dimension of the groove 3 is substantially the same as the circumferential width dimension of these protrusions 2, or the circumferential width of the groove 3 The case where the dimension is a little longer is shown.

前記金属細管１は、例えばステンレスなどの金属材料で円筒形に形成した金属パイプであり、図３（ａ）に示す如く、突起２又は凹溝３が等間隔毎に複数夫々平行に略全長に亘って形成された平板１′を押し出し加工などで成形し、その後工程で図３（ｂ）に示す如く、この平板１′を円筒状に丸めて成形すると共に、それにより接合された前記平板１′の端面１ｃ′，１ｃ′同士を例えば溶着などの従来一般的な接着方法で接着して製造する。
また、それ以外の製造方法として、例えば押出成形や鋳造などで金属細管１を製造することも可能である。 The metal thin tube 1, for example, stainless steel is a metal pipe which is formed into a cylindrical shape with metallic materials such as, as shown in FIG. 3 (a), protrusions 2 or groove 3 is more than husband equal intervals s parallel substantially The flat plate 1 ′ formed over the entire length is formed by extrusion or the like, and then the flat plate 1 ′ is rounded and formed into a cylindrical shape in the subsequent process as shown in FIG. The end faces 1c 'and 1c' of the flat plate 1 'are manufactured by bonding them by a conventional general bonding method such as welding.
In addition, as another manufacturing method, the metal thin tube 1 can be manufactured by, for example, extrusion molding or casting.

次に、斯かるボールペンチップＡの製造方法を工程順に従って説明する。
先ず、図４（ａ）に示す如く、金属細管１の先端開口１ａに、例えばドリルなどの切削工具７を該金属細管１の軸方向へ挿入して、該金属細管１の先端内周の切削加工を行う。 Next, a method for manufacturing the ballpoint pen tip A will be described in the order of steps.
First, as shown in FIG. 4A, a cutting tool 7 such as a drill is inserted into the tip opening 1a of the metal thin tube 1 in the axial direction of the metal thin tube 1 to cut the inner periphery of the tip of the metal thin tube 1. Processing.

この切削加工によって、図４（ｂ）に示す如く、金属細管１の先端内周面には、転写ボール４の外径よりも若干大きな環状切削面５が形成され、これと略同時に各突起２の先端には、切削端面６が形成される。
その際、この切削端面６は、転写ボール４と係合するように図示例の如く所定角度で傾斜させる。 By this cutting process, as shown in FIG. 4B, an annular cutting surface 5 that is slightly larger than the outer diameter of the transfer ball 4 is formed on the inner peripheral surface of the tip of the metal thin tube 1, and at the same time, each projection 2 A cutting end face 6 is formed at the tip of the.
At this time, the cutting end face 6 is inclined at a predetermined angle as shown in the example so as to engage with the transfer ball 4.

その後、図４（ｃ）に示す如く、金属細管１の先端外周面を先細状に切削してテーパー部８を形成し、この状態で、図４（ｄ）に示す如く、金属細管１の先端から転写ボール４を挿入して、前記環状切削面５からなるボールハウス５′及び前記切削端面６からなるボール受け座６′と接触させる。
この際、必要に応じ、転写ボール４をボール受け座６′に押し込んで曲面状の圧痕（図示せず）を形成する。 Thereafter, as shown in FIG. 4 (c), the outer peripheral surface of the tip of the metal thin tube 1 is cut into a tapered shape to form a tapered portion 8. In this state, as shown in FIG. 4 (d), the tip of the metal thin tube 1 is cut. Then, the transfer ball 4 is inserted and brought into contact with a ball house 5 ′ composed of the annular cutting surface 5 and a ball receiving seat 6 ′ composed of the cutting end surface 6.
At this time, if necessary, the transfer ball 4 is pushed into the ball receiving seat 6 'to form a curved indentation (not shown).

そして、前記テーパー部８の先端をカシメ加工して内方に押圧変形すれば、このカシメ部９とボールハウス５′の残った底面からなるボール受け座６′とで転写ボール４が脱落することなく回転自在に抱持されて完成する。   When the tip of the taper portion 8 is crimped and is inwardly pressed and deformed, the transfer ball 4 falls off at the crimping portion 9 and the ball receiving seat 6 'formed of the remaining bottom surface of the ball house 5'. Completely held in a freely rotatable manner.

この完成状態で、図１に示す金属細管１の基端開口１ｂからインク（図示せず）を充填すれば、別な加工を追加しなくとも上記突起２間の凹溝３がインク誘導溝となって、ボールハウス５′へ供給する。   In this completed state, if ink (not shown) is filled from the base end opening 1b of the metal thin tube 1 shown in FIG. 1, the concave groove 3 between the protrusions 2 becomes the ink guide groove without additional processing. It supplies to the ball house 5 '.

この実施例２は、図５（ａ）（ｂ）に示す如く、上記突起２の先端面を凹ませた構成が、前記図１〜図４に示した実施例１とは異なり、それ以外の構成は図１〜図４に示した実施例１と同じものである。   As shown in FIGS. 5 (a) and 5 (b), the second embodiment is different from the first embodiment shown in FIGS. The configuration is the same as that of the first embodiment shown in FIGS.

図５（ａ）の場合には、各突起２を金属細管１の中心軸へ向け断面略矩形状に突出させ、その先端面を円弧状に凹ませており、図５（ｂ）の場合には、金属細管１の中心軸へ向け断面略台形状に突出させ、その先端面を円弧状に凹ませている。   In the case of FIG. 5 (a), each protrusion 2 is projected in a substantially rectangular shape in cross section toward the central axis of the metal thin tube 1, and its tip surface is recessed in an arc shape. Is protruded in a substantially trapezoidal cross section toward the central axis of the metal thin tube 1, and its tip surface is recessed in an arc shape.

従って、図５（ａ）（ｂ）に示す実施例２も、上述した前記図１〜図４に示した実施例１と同様な作用効果が得られる。
更に、各突起２の先端面の形状は、上記金属細管１の製造方法により、図５（ａ）（ｂ）以外の形状に形成することも可能である。 Therefore, the second embodiment shown in FIGS. 5A and 5B can obtain the same effects as those of the first embodiment shown in FIGS.
Furthermore, the shape of the front end surface of each protrusion 2 can be formed in a shape other than FIGS. 5A and 5B by the method for manufacturing the metal thin tube 1.

この実施例３は、図６に示す如く、上記突起２の周方向幅寸法よりも凹溝３の周方向幅寸法の方を遙かに長くした構成が、前記図１〜図４に示した実施例１とは異なり、それ以外の構成は図１〜図４に示した実施例１と同じものである。   In the third embodiment, as shown in FIG. 6, the configuration in which the circumferential width dimension of the groove 3 is much longer than the circumferential width dimension of the protrusion 2 is shown in FIGS. Unlike the first embodiment, the other configuration is the same as that of the first embodiment shown in FIGS.

図示例の場合には、各突起２を金属細管１の中心軸へ向け断面略半円形状に突出させているが、図５（ａ）（ｂ）に示した実施例２のように各突起２を金属細管１の中心軸へ向け例えば断面略矩形状又は断面略台形状に突出させ、必要に応じてその先端面を凹ませることも可能である。   In the case of the illustrated example, each protrusion 2 is protruded in a substantially semicircular cross section toward the central axis of the metal thin tube 1, but each protrusion 2 as in Example 2 shown in FIGS. 5 (a) and 5 (b). It is also possible to project 2 toward the central axis of the metal thin tube 1, for example, to have a substantially rectangular cross section or a substantially trapezoidal cross section, and to have the tip surface recessed as necessary.

従って、図６に示す実施例３も、上述した前記図１〜図４に示した実施例１と同様な作用効果が得られ、更に加えてインク誘導溝３の断面積を前記図１〜図４に示した実施例１よりも広く確保できるため、インク供給がスムーズに行われるという利点がある。   Accordingly, the third embodiment shown in FIG. 6 can obtain the same operation and effect as those of the first embodiment shown in FIGS. 4 can be secured wider than that of the first embodiment shown in FIG.

また、例えば図１〜図４に示した実施例１から図６に示した実施例３に至るような突起２の周方向幅寸法及び凹溝３の周方向幅寸法が異なる複数種類の金属細管１を予め用意すれば、これらに同じ切削加工を行うだけで、インク誘導溝３の断面積が異なる複数種類のボールペンチップＡを製造でき、それによりインク粘度に合わせて最適なインク供給量のボールペンチップＡを任意に選択できて便利である。   Further, for example, a plurality of types of metal thin tubes having different circumferential width dimensions of the protrusions 2 and circumferential groove width dimensions of the concave grooves 3 from the first embodiment shown in FIGS. 1 to 4 to the third embodiment shown in FIG. 1 is prepared in advance, it is possible to manufacture a plurality of types of ball-point pen tips A having different cross-sectional areas of the ink guide grooves 3 by simply performing the same cutting process. The chip A can be arbitrarily selected, which is convenient.

尚、前示各実施例では、金属細管１の先端内周に突起２と凹溝３を周方向へ等間隔毎に３本ずつ交互に一体成形したが、これに限定されず、金属細管１の先端内周に突起２と凹溝３を周方向へ等間隔毎に２本又は４本以上一体成しても良い。   In each of the preceding embodiments, three protrusions 2 and three concave grooves 3 are alternately integrally formed at equal intervals in the circumferential direction on the inner periphery of the tip of the metal thin tube 1. Two or four or more protrusions 2 and concave grooves 3 may be integrated in the circumferential direction at regular intervals in the inner periphery of the tip.

本発明の一実施例を示すボールペンチップの拡大縦断正面図である。It is an enlarged vertical front view of the ball-point pen tip which shows one Example of this invention. 図１の（２）−（２）線に沿える拡大横断平面図である。FIG. 2 is an enlarged cross-sectional plan view taken along line (2)-(2) in FIG. 1. 金属細管の製造方法の一例を工程順に示す拡大横断平面図である。It is an expansion cross-sectional top view which shows an example of the manufacturing method of a metal thin tube in order of a process. ボールペンチップの製造方法を示す部分的な拡大縦断正面図である。It is a partial enlarged vertical front view which shows the manufacturing method of a ball-point pen tip. 本発明の他の実施例を示すボールペンチップの拡大横断平面図である。It is an expansion cross-sectional top view of the ball-point pen tip which shows the other Example of this invention. 本発明の他の実施例を示すボールペンチップの拡大横断平面図である。It is an expansion cross-sectional top view of the ball-point pen tip which shows the other Example of this invention.

符号の説明Explanation of symbols

Ａ ボールペンチップ １ 金属細管
１′ 平板 ２ 突起
３ 凹溝（インク誘導溝） ４ 転写ボール
５ 環状切削面 ５′ ボールハウス
６ 切削端面 ６′ ボール受け座 A Ball pen tip 1 Metal thin tube 1 'Flat plate 2 Protrusion 3 Concave groove (ink guide groove) 4 Transfer ball 5 Annular cutting surface 5' Ball house 6 Cutting end surface 6 'Ball seat

Claims (5)

金属細管の先端内周にボール受け座を突出させ、金属細管の先端外周を内方へ押圧変形させてボール受け座に転写ボールを回転自在に抱持するボールペンチップにおいて、
上記金属細管（１）の内周面に、該金属細管（１）の軸方向の略全長に亘って延びる突起（２）を周方向へ適宜間隔毎に複数設け、これら突起（２）先端の内径を転写ボール（４）の外径よりも小さくし、前記金属細管（１）の先端内周にボールハウス（５′）を形成すると共に、前記突起（２）の先端にボール受け座（６′）を形成したことを特徴とするボールペンチップ。 In the ball-point pen tip that protrudes the ball receiving seat on the inner periphery of the tip of the metal thin tube, presses and deforms the outer periphery of the tip of the metal thin tube inward, and rotatably holds the transfer ball on the ball receiving seat.
A plurality of protrusions (2) extending substantially along the axial length of the metal thin tube (1) are provided on the inner peripheral surface of the metal thin tube (1) at appropriate intervals in the circumferential direction. The inner diameter is made smaller than the outer diameter of the transfer ball (4), a ball house (5 ') is formed on the inner periphery of the tip of the metal thin tube (1), and a ball receiving seat (6) at the tip of the protrusion (2). A ballpoint pen tip characterized by forming ′). 上記突起（２）を金属細管（１）の内周面に周方向へ等間隔毎に３つ突設したことを特徴とする請求項１記載のボールペンチップ。 The ball-point pen tip according to claim 1, wherein three protrusions (2) are provided at regular intervals in the circumferential direction on the inner peripheral surface of the metal thin tube (1). 金属細管の先端内周に突出するボール受け座に向けて転写ボールを挿入した後に、この金属細管の先端外周を内方へ押圧変形させて転写ボールを回転自在に抱持するボールペンチップの製造方法において、
上記金属細管（１）の軸方向の略全長に亘って延びる突起（２）が周方向へ適宜間隔毎に複数突設された金属細管（１）の先端内周を切削加工して、該金属細管（１）の先端内周面にボールハウス（５′）を形成すると共に、前記突起（２）の先端にボール受け座（６′）を形成したことを特徴とするボールペンチップの製造方法。 A ballpoint pen tip manufacturing method in which a transfer ball is inserted toward a ball seat projecting to the inner periphery of the tip of a metal thin tube, and then the outer periphery of the tip of the metal thin tube is pressed and deformed inward to hold the transfer ball rotatably. In
The metal thin tube (1) is cut by cutting the inner periphery of the tip of the metal thin tube (1) in which a plurality of protrusions (2) extending substantially the entire length in the axial direction are provided at appropriate intervals in the circumferential direction. A ballpoint pen tip manufacturing method, wherein a ball house (5 ') is formed on the inner peripheral surface of the tip of the thin tube (1), and a ball receiving seat (6') is formed on the tip of the protrusion (2). 上記突起（２）が適宜間隔毎に複数夫々平行に形成された平板（１′）を円筒状に丸めて金属細管（１）を作ったことを特徴とする請求項３項記載のボールペンチップの製造方法。 4. The ballpoint pen tip according to claim 3, wherein a metal thin tube (1) is formed by rounding a flat plate (1 ') in which a plurality of projections (2) are formed in parallel at appropriate intervals. Production method. 上記金属細管（１）として、突起（２）の間隔が異なる複数種類を用意したことを特徴とする請求項３又は４項記載のボールペンチップの製造方法。 5. The ballpoint pen tip manufacturing method according to claim 3, wherein a plurality of types of the metal thin tubes (1) having different intervals between the protrusions (2) are prepared.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5085431A (en) * 1973-12-01 1975-07-10
JPS57149171U (en) * 1981-03-13 1982-09-18
JPS6391296A (en) * 1986-10-06 1988-04-21 三菱鉛筆株式会社 Manufacture of ball pen tip

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5085431A (en) * 1973-12-01 1975-07-10
JPS57149171U (en) * 1981-03-13 1982-09-18
JPS6391296A (en) * 1986-10-06 1988-04-21 三菱鉛筆株式会社 Manufacture of ball pen tip

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