JP2005225071A - Ballpoint pen tip and manufacturing method of ballpoint pen tip - Google Patents

Ballpoint pen tip and manufacturing method of ballpoint pen tip Download PDF

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JP2005225071A
JP2005225071A JP2004035899A JP2004035899A JP2005225071A JP 2005225071 A JP2005225071 A JP 2005225071A JP 2004035899 A JP2004035899 A JP 2004035899A JP 2004035899 A JP2004035899 A JP 2004035899A JP 2005225071 A JP2005225071 A JP 2005225071A
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ball
pipe
pen tip
inward
caulking
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Tomoyuki Kibune
知之 木船
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Mitsubishi Pencil Co Ltd
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Mitsubishi Pencil Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe type ballpoint pen tip which is capable of discharging ink sufficiently even in high-speed writing or the like, and a manufacturing method of the pipe type ballpoint pen tip. <P>SOLUTION: The inner and outer peripheral surfaces of a pipe 10 are deformed by restricting in the inward direction from those before the restricting and thereby a restricted part is formed. A step part 17 is formed at the rearmost end of the restricted part in the inner and outer surfaces. Between the step part 17 and the front face 12A of an inward projection part 12, an ink reservoir 40 not existing previously is formed. The ink supplied from an ink tank comes to be collected in this ink reservoir 40. Therefore the ink collected in the ink reservoir 40 is to be supplied even when sudden or high-speed writing is conducted, and thus properties of high-speed writing and initial writing can be improved, compared with the previous pipe-like ballpoint pen tip wherein no ink reservoir 40 exists. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、ボールペンチップ及びその製造方法に関し、更に詳しくは、金属製のパイプの一方側にボールを回転自在に保持させた、いわゆるパイプ式のボールペンチップ及びその製造方法に関するものである。 The present invention relates to a ballpoint pen tip and a manufacturing method thereof, and more particularly to a so-called pipe type ballpoint pen tip in which a ball is rotatably held on one side of a metal pipe and a manufacturing method thereof.

従来から、ボールペンチップには種々のものが提供されている。例えば、金属製のパイプの一方側にボールを回転自在に保持させた、いわゆるパイプ式のボールペンチップが提供されている（特許文献１参照）。
特開平０９−１２３６６３号公報 Conventionally, various ballpoint pen tips have been provided. For example, a so-called pipe-type ballpoint pen tip is provided in which a ball is rotatably held on one side of a metal pipe (see Patent Document 1).
Japanese Patent Application Laid-Open No. 09-123663

以下、特許文献１に開示されたような従来のパイプ式のボールペンチップの製造方法の一例を、図示しながら説明する。
図５では、金属製のパイプ10の外周面16側からポンチ（図示せず）を押圧し、ボールの受け座となる内方突出部12を形成した図を示している。この内方突出部12は、周方向に１２０°おきに３箇所形成されている。
次に、パイプの前方端をテーパー形状にしたテーパー部18を形成する工程を入れる。この工程は切削により行われ、パイプ先端の肉厚を薄くし、以後行われるカシメ工程における加工を容易等にするために行われる。その後、必要に応じて内方突出部12の前方側パイプ内周面15に切削等を施す。次に、パイプ10の先端からボール20を挿入し、前記内方突出部12にボール20を着座させる。ここまでの状態を図６に示す。
最終工程として、パイプの先端にカシメ加工を施しカシメ部11を形成し、ボール20がパイプ10の前方に抜けないようにし、ボールペンチップ１が完成する（図７参照）。 Hereinafter, an example of a method of manufacturing a conventional pipe-type ballpoint pen chip as disclosed in Patent Document 1 will be described with reference to the drawings.
FIG. 5 shows a diagram in which a punch (not shown) is pressed from the outer peripheral surface 16 side of the metal pipe 10 to form an inward projecting portion 12 that serves as a ball seat. The inward projecting portions 12 are formed at three locations every 120 ° in the circumferential direction.
Next, a step of forming a tapered portion 18 in which the front end of the pipe is tapered is added. This process is performed by cutting to reduce the thickness of the pipe tip, and to facilitate the subsequent process in the caulking process. Thereafter, cutting or the like is performed on the front pipe inner peripheral surface 15 of the inward projecting portion 12 as necessary. Next, the ball 20 is inserted from the tip of the pipe 10, and the ball 20 is seated on the inward protruding portion 12. The state so far is shown in FIG.
As a final process, crimping is performed on the tip of the pipe to form a crimping portion 11 so that the ball 20 does not come out of the pipe 10 and the ballpoint pen tip 1 is completed (see FIG. 7).

近年では、より細字書きのボールペン等が望まれる傾向が強くなってきており、このために、ボールの直径も例えば０．３ｍｍなどの極めて小さいものが用いられるようになってきている。このような極小ボールが用いられた場合、相対的にパイプの径なども細くなる傾向があり、また、ボールとパイプ内径との隙間も狭くなる傾向がある。この結果、インクの吐出量も減少するようになるため、高速筆記を行った場合などには、十分にインクが追従しなくなるという課題が存在する。
そこで、本発明は、高速筆記等においてもインクを十分に吐出しえるパイプ式のボールペンチップ及びパイプ式のボールペンチップの製造方法を提供することを課題とする。 In recent years, there has been a strong demand for a ballpoint pen or the like written in finer characters. For this reason, a ball having a very small diameter of, for example, 0.3 mm has been used. When such an extremely small ball is used, the diameter of the pipe tends to be relatively thin, and the gap between the ball and the pipe inner diameter tends to be narrow. As a result, the amount of ink discharged also decreases, and there is a problem that the ink does not sufficiently follow up when performing high-speed writing.
Accordingly, an object of the present invention is to provide a pipe-type ballpoint pen tip that can sufficiently discharge ink even in high-speed writing and the like, and a method for manufacturing a pipe-type ballpoint pen tip.

（請求項１）本発明のうち請求項１に記載した発明は、金属製のパイプと、ボールとを備え、前記パイプは、その前方側の端部に設けられ、かつ、ボールの直径よりも内径を小さく形成されているカシメ部と、このカシメ部から所定距離の位置に設けられ、かつ、パイプの内方へ向けて突出している複数の内方突出部と、カシメ部と各内方突出部との間に設けられ、かつ、ボールを収納可能に形成されているボール収納部とを有し、前記ボールは、ボール収納部に収納され、カシメ部と各内方突出部とに支持されることにより、その一部をカシメ部からパイプの外部に突出させつつ、回転自在に保持されているボールペンチップであって、前記カシメ部から後方に向かってパイプの内周面及び外周面に絞り加工が施された絞り部が設けられ、前記絞り部の内周面後端には、内径が後方に向かって拡がる段部が形成され、この段部よりも後方に前記内方突出部が形成され、内方突出部の前方面と前記段部との間にインク溜まりが形成されたことを特徴とするものである。 (Invention 1) The invention described in claim 1 of the present invention comprises a metal pipe and a ball, and the pipe is provided at an end portion on the front side thereof, and is larger than the diameter of the ball. A caulking portion having a small inner diameter, a plurality of inward projecting portions provided at a predetermined distance from the caulking portion and projecting inward of the pipe, and the caulking portion and each inward projecting portion And a ball storage portion formed so as to be capable of storing a ball. The ball is stored in the ball storage portion and supported by the crimping portion and each inward protruding portion. A ball-point pen tip that is rotatably supported while a part thereof protrudes from the caulking portion to the outside of the pipe, and is squeezed to the inner peripheral surface and the outer peripheral surface of the pipe from the caulking portion toward the rear. A processed diaphragm is provided, At the rear end of the inner peripheral surface of the throttle portion, a step portion whose inner diameter expands rearward is formed, and the inward protrusion portion is formed behind the step portion, and the front surface of the inward protrusion portion and the An ink reservoir is formed between the step portion and the step portion.

（請求項２）本発明のうち請求項２に記載した発明は、金属製のパイプと、ボールとを備え、前記パイプは、その前方側の端部に設けられ、かつ、ボールの直径よりも内径を小さく形成されているカシメ部と、このカシメ部から所定距離の位置に設けられ、かつ、パイプの内方へ向けて突出している複数の内方突出部と、カシメ部と各内方突出部との間に設けられ、かつ、ボールを収納可能に形成されているボール収納部とを有し、前記ボールは、ボール収納部に収納され、カシメ部と各内方突出部とに支持されることにより、その一部をカシメ部からパイプの外部に突出させつつ、回転自在に保持されているボールペンチップの製造方法であって、カシメ部から後方に向かってパイプの内周面及び外周面に絞り部と、前記絞り部の内周面後端に内径が後方に向かって拡がる段部とを設ける絞り工程と、前記段部よりも後方に複数の内方突出部を設ける押圧工程と、内方突出部より前方側の絞り部内部をボール収納部とし、このボール収納部にボールを収納した後に、パイプの絞り部側の端部にカシメ部を設けるカシメ工程とを含むことを特徴とするものである。 (Claim 2) The invention described in claim 2 of the present invention includes a metal pipe and a ball, and the pipe is provided at an end portion on the front side of the pipe and is larger than the diameter of the ball. A caulking portion having a small inner diameter, a plurality of inward projecting portions provided at a predetermined distance from the caulking portion and projecting inward of the pipe, and the caulking portion and each inward projecting portion And a ball storage portion formed so as to be capable of storing a ball. The ball is stored in the ball storage portion and supported by the crimping portion and each inward protruding portion. A method of manufacturing a ballpoint pen tip that is rotatably held while a part thereof protrudes from the caulking portion to the outside of the pipe. The throttle part and the inner peripheral surface of the throttle part A squeezing step in which the inner diameter expands toward the rear, a pressing step in which a plurality of inward protruding portions are provided behind the stepped portion, and the inside of the squeezing portion on the front side of the inner protruding portion is stored in a ball. And a caulking step of providing a caulking portion at the end of the pipe on the throttle portion side after the ball is accommodated in the ball accommodating portion.

上記、「パイプ」とは、ボールを保持するためのものをいう。このパイプは、例えば、ステンレスなどの金属によって形成することができる。
また、「カシメ部」とは、ボール収納部に収納したボールを支持するためのものをいう。このカシメ部は、パイプの一方側の端部に設けられる。また、このカシメ部は、その内径を、ボールの直径よりも小さく形成される。
また、「内方突出部」とは、ボール収納部に収納したボールを支持するためのものをいう。この内方突出部は、パイプの所定位置であって、カシメ部から所定距離の位置に複数設けられる。また、各内方突出部は、パイプの内方へ向けて突出し、これにより、内方突出部を設けた部分のパイプの内径が、ボールの直径よりも小さくなるようにしている。
また、「ボール収納部」とは、ボールを収納するためのものをいう。このボール収納部は、カシメ部と各内方突出部との間に設けられる。また、このボール収納部は、円筒状に形成され、その内径を、ボールの直径よりもわずかに大きく形成される。
また、「ボール」とは、筆記面にインクを塗布するためのものをいう。このボールは、例えば、超硬合金、ステンレス、焼入鋼又はセラミックなどによって形成することができる。また、このボールは、ボール収納部に収納され、カシメ部と各内方突出部とに支持されることにより、その一部をカシメ部からパイプの外部に突出させつつ、回転自在にパイプの一方側に保持される。
「前方」とは、パイプチップのうちカシメ部が形成されている方向といい、「後方」とは、パイプチップに供給されるインクが収納されている方向をいう。 The above “pipe” is used to hold a ball. This pipe can be formed of, for example, a metal such as stainless steel.
Further, the “crimping part” refers to a part for supporting the ball stored in the ball storage part. This caulking portion is provided at one end of the pipe. Further, the caulking portion is formed so that its inner diameter is smaller than the diameter of the ball.
Further, the “inward protruding portion” means a member for supporting the ball stored in the ball storage portion. A plurality of the inward protruding portions are provided at a predetermined position of the pipe and at a predetermined distance from the caulking portion. Further, each inward protruding portion protrudes inward of the pipe, so that the inner diameter of the pipe in the portion provided with the inward protruding portion is made smaller than the diameter of the ball.
The “ball storage unit” refers to a unit for storing a ball. The ball storage portion is provided between the crimping portion and each inward protruding portion. The ball storage portion is formed in a cylindrical shape and has an inner diameter slightly larger than the diameter of the ball.
Further, the “ball” is for applying ink to the writing surface. This ball can be formed of, for example, cemented carbide, stainless steel, hardened steel, or ceramic. The ball is stored in the ball storage portion and supported by the crimping portion and each inward protruding portion, so that a part of the ball protrudes from the crimping portion to the outside of the pipe and can be rotated freely. Held on the side.
“Front” refers to the direction in which the crimped portion of the pipe tip is formed, and “rear” refers to the direction in which the ink supplied to the pipe tip is stored.

本発明により、高速筆記等においてもインクを十分に吐出しえるパイプ式のボールペンチップ及びパイプ式のボールペンチップの製造方法を提供することができる。 According to the present invention, it is possible to provide a pipe-type ballpoint pen tip and a method for manufacturing a pipe-type ballpoint pen tip that can sufficiently discharge ink even in high-speed writing or the like.

図１〜４を用いて、本発明の実施の形態を説明する。
図１は、パイプ10の前方端において、所定長さの絞り加工を施し絞り部14を形成したものである。絞り加工により、パイプ10の内周面15と外周面16とが絞り加工前よりも内方に変形し絞り部14が形成されている。そして、内表面15及び外表面16における絞り部14の最後端には段部17が形成されている。絞り加工は、パイプ10の外径よりも小径の貫通孔31及び貫通孔31の後端にテーパー部32を形成したダイス30で行っている。ダイス30の貫通孔31の後端からパイプ10を押し込み、パイプ10の前方を内方へ変形させ絞り部14を形成している。
次に、この絞り部14よりも後方の位置においてポンチ（図示せず）を外表面16側から押圧し、内方突出部12を３箇所形成した。この結果、段部17と内方突出部12の前方面12Aとの間には、インク溜まり40が形成されることになる。ここまでの状態を示したのが図２である。 The embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a drawing portion 14 formed by drawing a predetermined length at the front end of a pipe 10. Due to the drawing process, the inner peripheral surface 15 and the outer peripheral surface 16 of the pipe 10 are deformed inward than before the drawing process, and the drawn part 14 is formed. A stepped portion 17 is formed at the rearmost end of the narrowed portion 14 on the inner surface 15 and the outer surface 16. The drawing process is performed with a through hole 31 having a diameter smaller than the outer diameter of the pipe 10 and a die 30 having a tapered portion 32 formed at the rear end of the through hole 31. The pipe 10 is pushed from the rear end of the through hole 31 of the die 30 and the front of the pipe 10 is deformed inward to form the throttle portion 14.
Next, a punch (not shown) was pressed from the outer surface 16 side at a position behind the throttle portion 14 to form three inward protruding portions 12. As a result, an ink reservoir 40 is formed between the stepped portion 17 and the front surface 12A of the inward protruding portion 12. FIG. 2 shows the state up to this point.

次に、図３、図４に示すようにパイプ10の前方端付近を前方に先窄まりのテーパー状に切削したテーパー部18を形成する。そして、ボール収納部13にボール20を挿入し、パイプ10の前端を内方に変形させることで、カシメ部11を形成する。その後、ボール20を前方から後方に向かって叩き、内方突出部12の前方にボールの叩きあとを形成した球面受け座としてある。
図４から分かるように、段部17と内方突出部12の前方面12Aとの間には、従来には存在しなかったインク溜まり40が形成されるようになっている。図示しないインクタンクから供給されたインクは、このインク溜まり40に溜まるようになる。このため、急激な筆記を行った場合や、高速筆記を行った場合であっても、このインク溜まり40にあるインクが供給されるようになるため、従来のインク溜まり40が存在しないパイプ状のボールペンチップに比べ、高速筆記性や、初筆性を向上させることができるようになる。 Next, as shown in FIGS. 3 and 4, a tapered portion 18 is formed by cutting the vicinity of the front end of the pipe 10 in a tapered shape that is tapered forward. Then, the caulking portion 11 is formed by inserting the ball 20 into the ball housing portion 13 and deforming the front end of the pipe 10 inward. Thereafter, the ball 20 is struck from the front to the rear, and a spherical seat is formed in the front of the inward projecting portion 12 and the ball is struck.
As can be seen from FIG. 4, an ink reservoir 40 that does not exist conventionally is formed between the stepped portion 17 and the front surface 12 </ b> A of the inward protruding portion 12. Ink supplied from an ink tank (not shown) is accumulated in the ink reservoir 40. For this reason, even when abrupt writing or high-speed writing is performed, the ink in the ink reservoir 40 is supplied, so that the conventional ink reservoir 40 does not exist. Compared with a ballpoint pen tip, high-speed writing performance and initial writing performance can be improved.

本発明の実施の形態を説明するものであり、絞り部を形成する工程を示すものである。An embodiment of the present invention will be described and shows a step of forming a throttle portion. 本発明の実施の形態を説明するものであり、内方突出部を形成する工程を示すものである。An embodiment of the present invention will be described and shows a process of forming an inward protruding portion. 本発明の実施の形態を説明するものであり、パイプの前方端にテーパー部を形成工程を示すものである。An embodiment of the present invention will be described, and shows a process of forming a tapered portion at the front end of a pipe. 本発明の実施の形態を説明するものであり、工程が完了した状態を示す縦断面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view illustrating a state in which a process is completed, illustrating an embodiment of the present invention. 従来の技術を示す縦断面図である。It is a longitudinal cross-sectional view which shows the prior art. 従来の技術を示す縦断面図である。It is a longitudinal cross-sectional view which shows the prior art. 従来の技術を示す縦断面図である。It is a longitudinal cross-sectional view which shows the prior art.

符号の説明Explanation of symbols

1 ボールペンチップ
10 パイプ
11 カシメ部
12 内方突出部
13 ボール収納部
14 絞り部
15 パイプ内周面
16 パイプ外周面
17 段部
20 ボール
30 ダイス
31 貫通孔
32 テーパー部
40 インク溜まり


1 Ballpoint pen tip
10 pipes
11 Caulking section
12 Inward protrusion
13 Ball compartment
14 Aperture
15 Pipe inner peripheral surface
16 Pipe outer peripheral surface
17 steps
20 balls
30 dice
31 Through hole
32 Taper part
40 Ink reservoir


Claims (2)

金属製のパイプと、ボールとを備え、
前記パイプは、その前方側の端部に設けられ、かつ、ボールの直径よりも内径を小さく形成されているカシメ部と、このカシメ部から所定距離の位置に設けられ、かつ、パイプの内方へ向けて突出している複数の内方突出部と、カシメ部と各内方突出部との間に設けられ、かつ、ボールを収納可能に形成されているボール収納部とを有し、前記ボールは、ボール収納部に収納され、カシメ部と各内方突出部とに支持されることにより、その一部をカシメ部からパイプの外部に突出させつつ、回転自在に保持されているボールペンチップであって、
前記カシメ部から後方に向かってパイプの内周面及び外周面に絞り加工が施された絞り部が設けられ、前記絞り部の内周面後端には、内径が後方に向かって拡がる段部が形成され、この段部よりも後方に前記内方突出部が形成され、内方突出部の前方面と前記段部との間にインク溜まりが形成されたことを特徴とするボールペンチップ。 With metal pipes and balls,
The pipe is provided at an end on the front side thereof, and has a caulking portion formed to have an inner diameter smaller than the diameter of the ball, and is provided at a position at a predetermined distance from the caulking portion. A plurality of inwardly projecting portions projecting toward the base, and a ball storage portion provided between the crimping portion and each of the inward projecting portions and configured to be capable of storing a ball, Is a ball-point pen tip that is housed in the ball housing part and supported by the crimping part and each inward projecting part, so that a part of the projecting part protrudes from the caulking part to the outside of the pipe and is rotatably held. There,
A stepped portion in which a drawing portion is provided on the inner peripheral surface and the outer peripheral surface of the pipe toward the rear from the crimping portion, and an inner diameter expands rearward at the rear end of the inner peripheral surface of the drawing portion. The ball-point pen tip is characterized in that the inward protrusion is formed behind the step, and an ink reservoir is formed between the front surface of the inward protrusion and the step. 金属製のパイプと、ボールとを備え、
前記パイプは、その前方側の端部に設けられ、かつ、ボールの直径よりも内径を小さく形成されているカシメ部と、このカシメ部から所定距離の位置に設けられ、かつ、パイプの内方へ向けて突出している複数の内方突出部と、カシメ部と各内方突出部との間に設けられ、かつ、ボールを収納可能に形成されているボール収納部とを有し、前記ボールは、ボール収納部に収納され、カシメ部と各内方突出部とに支持されることにより、その一部をカシメ部からパイプの外部に突出させつつ、回転自在に保持されているボールペンチップの製造方法であって、
カシメ部から後方に向かってパイプの内周面及び外周面に絞り部と、前記絞り部の内周面後端に内径が後方に向かって拡がる段部とを設ける絞り工程と、前記段部よりも後方に複数の内方突出部を設ける押圧工程と、内方突出部より前方側の絞り部内部をボール収納部とし、このボール収納部にボールを収納した後に、パイプの絞り部側の端部にカシメ部を設けるカシメ工程とを含むことを特徴とするボールペンチップの製造方法。


With metal pipes and balls,
The pipe is provided at an end on the front side thereof, and has a caulking portion formed to have an inner diameter smaller than the diameter of the ball, and is provided at a position at a predetermined distance from the caulking portion. A plurality of inwardly projecting portions projecting toward the base, and a ball storage portion provided between the crimping portion and each of the inward projecting portions and configured to be capable of storing a ball, Of the ballpoint pen tip that is stored in the ball storage part and supported by the crimping part and each inwardly projecting part, so that a part of the ballpoint pen tip protrudes from the crimping part to the outside of the pipe and is rotatably supported. A manufacturing method comprising:
From the stepped portion, a narrowing step of providing a narrowed portion on the inner peripheral surface and the outer peripheral surface of the pipe from the caulking portion to the rear, and a stepped portion having an inner diameter extending rearward at the rear end of the inner peripheral surface of the throttled portion And a pressing step in which a plurality of inward protruding portions are provided at the rear, and the inside of the throttle portion in front of the inward protruding portion is a ball storage portion, and after the ball is stored in this ball storage portion, the end on the throttle portion side of the pipe And a caulking process for providing a caulking part in the part.


JP2004035899A 2004-02-13 2004-02-13 Ballpoint pen tip and manufacturing method of ballpoint pen tip Withdrawn JP2005225071A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006062175A (en) * 2004-08-26 2006-03-09 Pilot Ink Co Ltd Pipe-type ball-point pen tip and its manufacturing method
JP2011056946A (en) * 2009-09-09 2011-03-24 Dong-A Pencil Co Ltd Tube crimping tool for needle type ball-point pen tip

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006062175A (en) * 2004-08-26 2006-03-09 Pilot Ink Co Ltd Pipe-type ball-point pen tip and its manufacturing method
JP4568056B2 (en) * 2004-08-26 2010-10-27 パイロットインキ株式会社 Manufacturing method of pipe-type ballpoint pen tip
JP2011056946A (en) * 2009-09-09 2011-03-24 Dong-A Pencil Co Ltd Tube crimping tool for needle type ball-point pen tip
KR101565996B1 (en) * 2009-09-09 2015-11-05 동아연필 주식회사 Tool Reduction of Pipe for Niddle Type Ball Pen Tip

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