JP5363941B2 - Manufacturing method of pipe-type ballpoint pen tip - Google Patents

Manufacturing method of pipe-type ballpoint pen tip Download PDF

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JP5363941B2
JP5363941B2 JP2009241893A JP2009241893A JP5363941B2 JP 5363941 B2 JP5363941 B2 JP 5363941B2 JP 2009241893 A JP2009241893 A JP 2009241893A JP 2009241893 A JP2009241893 A JP 2009241893A JP 5363941 B2 JP5363941 B2 JP 5363941B2
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ball
tip
ballpoint pen
manufacturing
pen tip
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JP2011088303A (en
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誠 大屋
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Pilot Ink Co Ltd
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Pilot Ink Co Ltd
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Description

本発明は、パイプ式ボールペンチップの製造方法に関する。詳細には、金属製筒体の先端近傍の内面にボール受け座用の複数の内方突出部を径方向内方への押圧変形により形成したパイプ式ボールペンチップの製造方法に関する。 The present invention relates to a method for manufacturing a pipe-type ballpoint pen tip. More specifically, the present invention relates to a method for manufacturing a pipe-type ballpoint pen tip in which a plurality of inward protruding portions for ball receiving seats are formed on the inner surface in the vicinity of the tip of a metal cylinder by pressing and deforming radially inward.

特許文献1には、カシメ工程の後、ボールをハンマーで後方に押圧することによって、ボールとカシメ部内周面との前後方向の隙間を形成するハンマーリング工程を備えたパイプ式ボールペンチップの製造方法が記載されている。 Patent Document 1 discloses a method of manufacturing a pipe-type ballpoint pen tip having a hammering step of forming a clearance in the front-rear direction between a ball and a caulking portion inner surface by pressing the ball backward with a hammer after the caulking step. Is described.

特開2006−103288号公報JP 2006-103288 A

前記特許文献1の製造方法は、ハンマーによるボールへの押圧を強くすると、筆記時のボールとカシメ部内面との前後方向の隙間は確保されるとしても、筆記時のボールと内方突出部との接触面積が大きく増加し、筆記時のボール後面へのインキ供給が不十分となり、筆跡のカスレや途切れが生じるおそれがある。 In the manufacturing method of Patent Document 1, when the pressure on the ball by the hammer is increased, the clearance between the ball at the time of writing and the inner surface of the caulking part is secured, and the inward protruding portion and the ball at the time of writing The contact area of the ink is greatly increased, ink supply to the rear surface of the ball at the time of writing becomes insufficient, and there is a risk that the handwriting will be blurred or broken.

本発明は前記従来の問題点を解決するものであって、筆記時にボール後面への十分なインキ供給を行うことができ、筆記時、筆跡のカスレや途切れが生じることがなく、潤沢なインキ流出が可能なパイプ式ボールペンチップの製造方法を提供しようとするものである。
尚、本発明において、ボールペンチップにおける「前」とはボール側を指し、「後」とはその反対側を指す。本発明において、押圧ピンにおける「前」とは先端面を指し、「後」とはその反対側を指す。
The present invention solves the above-mentioned conventional problems, and can sufficiently supply ink to the rear surface of the ball at the time of writing. It is an object of the present invention to provide a method for manufacturing a pipe-type ballpoint pen tip that can be used.
In the present invention, “front” in the ballpoint pen tip indicates the ball side, and “rear” indicates the opposite side. In the present invention, “front” in the pressing pin refers to the tip surface, and “rear” refers to the opposite side.

<1>本願の第1の発明は、金属製筒体2の先端近傍の内周面にボール受け座用の複数の内方突出部23を形成するボール受け座形成工程と、前記ボール受け座形成工程の後、前記内方突出部23の前側の金属製筒体2の先端開口部にボール3を挿入し、金属製筒体2の先端の先細状のエッジ部21を内方に円周状に折り曲げることによりカシメ部22を形成するカシメ工程と、前記カシメ工程の後、ボール3をハンマー4で後方に押圧し、ボール3を内方突出部23の前面に押し付けることにより、筆記時のカシメ部22内面とボール3との前後方向の隙間を確保するハンマーリング工程とからなるパイプ式ボールペンチップの製造方法であって、前記ハンマーリング工程の前に、予め各々の内方突出部23の前面に径方向に延びる溝23aを形成し、前記ハンマーリング工程の後に、前記溝23aを完全には潰さず存在させることを要件とする。 <1> The first invention of the present application is a ball receiving seat forming step for forming a plurality of inwardly projecting portions 23 for ball receiving seats on the inner peripheral surface in the vicinity of the tip of the metal cylinder 2, and the ball receiving seat. After the forming step, the ball 3 is inserted into the front end opening of the metal cylinder 2 on the front side of the inward projecting portion 23, and the tapered edge portion 21 at the front end of the metal cylinder 2 is circumferentially inward. A caulking process for forming the caulking portion 22 by bending it into a shape, and after the caulking process, the ball 3 is pressed backward with the hammer 4 and the ball 3 is pressed against the front surface of the inward protruding portion 23 to A pipe-type ball-point pen tip manufacturing method comprising a hammering step for securing a clearance in the front-rear direction between the inner surface of the crimping portion 22 and the ball 3, and before the hammering step, Groove 23 extending radially in front Forming a, after the hammering step, and the requirements to be present not crushed completely the groove 23a.

前記第1の発明のパイプ式ボールペンチップの製造方法は、ハンマーリング工程の前に、予め各々の内方突出部23の前面に径方向に延びる溝23aを形成し、前記ハンマーリング工程の後に、前記溝23aを完全には潰さず存在させることによって、ハンマー4によるボール3への押圧を強くしても、筆記時にボール3後面への十分なインキ供給を行うことができ、その結果、筆記時、筆跡のカスレや途切れが生じることがなく、潤沢なインキ流出が可能なパイプ式ボールペンチップが得られる。 In the manufacturing method of the pipe-type ballpoint pen tip according to the first aspect of the present invention, a groove 23a extending in the radial direction is formed in front of each inward projecting portion 23 before the hammering step, and after the hammering step, By allowing the groove 23a to be present without being completely crushed, it is possible to sufficiently supply ink to the rear surface of the ball 3 at the time of writing, even when the hammer 4 is strongly pressed against the ball 3, and as a result, at the time of writing. As a result, a pipe-type ballpoint pen tip capable of abundant ink spillage without causing blurring or interruption of handwriting is obtained.

<2>本願の第2の発明は、前記第1の発明のパイプ式ボールペンチップの製造方法において、前記ボール受け座形成工程において、先端面に径方向に延びる複数の突条54を備えた押圧ピン5を各々の内方突出部23の前面に押し当てることにより、前記各々の内方突出部23の前面に径方向に延びる溝23aを形成することを要件とする。 <2> According to a second aspect of the present invention, in the method for manufacturing a pipe-type ballpoint pen tip according to the first aspect, in the ball receiving seat forming step, a pressing provided with a plurality of ridges 54 extending in a radial direction on a tip surface It is a requirement that a groove 23 a extending in the radial direction is formed on the front surface of each inward protruding portion 23 by pressing the pin 5 against the front surface of each inward protruding portion 23.

前記第2の発明のパイプ式ボールペンチップの製造方法は、ボール受け座形成工程において、先端面に径方向に延びる複数の突条54を備えた押圧ピン5を各々の内方突出部23の前面に押し当てることにより、前記各々の内方突出部23の前面に径方向に延びる溝23aを形成することによって、溝23aの形成を、内方突出部23の形成(ボール受け座の形成)と同時に形成できる。それにより、溝23aを形成するための特別な工程を設ける必要がなく、製造工程の増加を抑えることができる。 In the method of manufacturing the pipe-type ballpoint pen tip according to the second aspect of the present invention, in the ball receiving seat forming step, the pressing pin 5 provided with a plurality of protrusions 54 extending in the radial direction on the tip surface is connected to the front surface of each inward protruding portion 23. By forming a groove 23a extending in the radial direction on the front surface of each inward protruding portion 23, the groove 23a is formed by forming the inner protruding portion 23 (forming a ball seat). Can be formed simultaneously. Accordingly, it is not necessary to provide a special process for forming the groove 23a, and an increase in the manufacturing process can be suppressed.

本発明のパイプ式ボールペンチップの製造方法によれば、筆記時、筆跡のカスレや途切れが生じることがなく、潤沢なインキ流出が可能なパイプ式ボールペンチップが得られる。 According to the method for manufacturing a pipe-type ballpoint pen tip of the present invention, a pipe-type ballpoint pen tip capable of abundant ink spilling without causing handwriting blurring or interruption during writing is obtained.

本発明の実施の形態におけるボール受け座形成工程の前の状態の金属製筒体を示す要部断面図である。It is principal part sectional drawing which shows the metal cylinder of the state before the ball receiving seat formation process in embodiment of this invention. 本発明の実施の形態のボール受け座形成工程を示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows the ball receiving seat formation process of embodiment of this invention. 図2のボール受け座形成工程で用いる押圧ピンの要部正面図である。It is a principal part front view of the press pin used at the ball receiving seat formation process of FIG. 図3の押圧ピンの底面図である。FIG. 4 is a bottom view of the pressing pin of FIG. 3. 図2のボール受け座形成工程の後の金属製筒体を示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows the metal cylinder after the ball receiving seat formation process of FIG. 図5の金属製筒体の平面図である。It is a top view of the metal cylinder of FIG. 本発明の実施の形態のハンマーリング工程を示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows the hammer ring process of embodiment of this invention. 図7のハンマーリング工程の後の金属製筒体を示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows the metal cylinder after the hammer ring process of FIG. 図1及び図7の製造方法により得られるボールペンチップを適用したボールペンの実施の形態を示す要部縦断面図である。It is a principal part longitudinal cross-sectional view which shows embodiment of the ball-point pen to which the ball-point pen tip obtained by the manufacturing method of FIG.1 and FIG.7 is applied.

図1乃至図9に本発明の実施の形態を示す。図1乃至図8に本発明のパイプ式ボールペンチップの製造方法の実施の形態を示す。図9に、前記図1乃至図8の製造方法で得られたパイプ式ボールペンチップ1の適用例を示す。 1 to 9 show an embodiment of the present invention. 1 to 8 show an embodiment of a method for manufacturing a pipe-type ballpoint pen tip according to the present invention. FIG. 9 shows an application example of the pipe-type ballpoint pen tip 1 obtained by the manufacturing method shown in FIGS.

・ボール受け座形成工程の前の状態
図1にボール受け座形成工程の前の状態の金属製筒体2を示す。
金属製筒体2の先端外周面には、円錐面が形成される。それにより、前記金属製筒体2の先端に先細状のエッジ部21が形成される。
FIG. 1 shows the metal cylinder 2 in a state before the ball receiving seat forming step.
A conical surface is formed on the outer peripheral surface of the tip of the metal cylinder 2. Thereby, a tapered edge portion 21 is formed at the tip of the metal cylinder 2.

・ボール受け座形成工程
図2にボール受け座形成工程を示し、図3及び図4に、図2のボール受け座形成工程に用いる押圧ピン5を示す。図5及び図6に、ボール受け座形成工程の後の状態を示す。
Ball receiving seat forming process FIG. 2 shows the ball receiving seat forming process, and FIGS. 3 and 4 show the pressing pin 5 used in the ball receiving seat forming process of FIG. 5 and 6 show a state after the ball seat formation process.

押圧ピン5は、先端に形成された円錐面51(先端面)と、該円錐面51の後端より後方に連設された円柱面52と、該円柱面52の後端に連設された段部53とからなる。前記押圧ピン5の先端の円錐面51には、径方向に延びる複数(例えば4本)の突条54が等間隔に形成される。 The pressing pin 5 is connected to the conical surface 51 (front end surface) formed at the front end, the cylindrical surface 52 provided continuously from the rear end of the conical surface 51, and the rear end of the cylindrical surface 52. And a stepped portion 53. A plurality of (for example, four) protrusions 54 extending in the radial direction are formed at equal intervals on the conical surface 51 at the tip of the pressing pin 5.

また、内方突出部23を形成するためのポンチ6は、先端に円錐面を備える。前記ポンチ6の円錐面の頂部はR曲面となっている。 The punch 6 for forming the inward projecting portion 23 has a conical surface at the tip. The top of the conical surface of the punch 6 is an R curved surface.

ボール受け座形成工程において、前記ポンチ6により金属製筒体2の先端近傍(エッジ部21後方)の側壁の複数箇所が、周状に等間隔に径方向内方に押圧変形され、それにより、金属製筒体2の先端近傍の内面に、複数(4個)の内方突出部23が形成される。 In the ball seat forming step, the punch 6 is pressed and deformed radially inward at equal intervals in the circumferential direction at a plurality of locations on the side wall near the tip of the metal cylinder 2 (behind the edge portion 21). A plurality (four) of inward projecting portions 23 are formed on the inner surface in the vicinity of the tip of the metal cylinder 2.

前記内方突出部23が形成される際、押圧ピン5の円錐面51が各々の内方突出部23の前面に圧接される。それにより、各々の内方突出部23の前面に円錐面状の窪み部23bが圧潰形成されるとともに、前記各々の窪み部23bの中央に径方向に延びる溝23aが圧潰形成される。(図5及び図6参照) When the inward protruding portion 23 is formed, the conical surface 51 of the pressing pin 5 is pressed against the front surface of each inward protruding portion 23. As a result, a conical recess 23b is formed on the front surface of each inward projection 23, and a radially extending groove 23a is formed in the center of each recess 23b. (See FIGS. 5 and 6)

前記各々の内方突出部23の前面の円錐面状の窪み部23bは、押圧ピン5の先端の円錐面51によって形成され、前記溝23aは押圧ピン5の先端の突条54によって形成される。 A conical recess 23b on the front surface of each inward projecting portion 23 is formed by a conical surface 51 at the tip of the pressing pin 5, and the groove 23a is formed by a protrusion 54 at the tip of the pressing pin 5. .

・カシメ工程
前記ボール受け座形成工程の後、カシメ工程が行われる(図示せず)。前記カシメ工程において、内方突出部23の前面に金属製筒体2の先端開口部からボール3を挿入配置し、その後、先細状のエッジ部21を円周状に内方に折り曲げることにより、内向きの環状突起よりなるカシメ部22が形成される。前記カシメ工程において、ボール3をカシメ部22の内周面に圧接させることにより、前記カシメ部22の内周面にボール3と同等の曲率を有する曲面状凹部が形成される。
-Caulking process A caulking process is performed after the ball receiving seat forming process (not shown). In the caulking step, the ball 3 is inserted and arranged from the front end opening of the metal cylinder 2 on the front surface of the inward projecting portion 23, and then the tapered edge portion 21 is bent inward in a circumferential shape, A caulking portion 22 made of an inward annular protrusion is formed. In the caulking step, by pressing the ball 3 against the inner peripheral surface of the caulking portion 22, a curved concave portion having a curvature equivalent to that of the ball 3 is formed on the inner peripheral surface of the caulking portion 22.

・ハンマーリング工程
図7にハンマーリング工程を示す。図8に前記ハンマーリング工程の後の状態を示す。前記カシメ工程の後、前記ハンマーリング工程が行われる。
-Hammering process FIG. 7 shows the hammering process. FIG. 8 shows a state after the hammering step. The hammering process is performed after the caulking process.

前記ハンマーリング工程において、ハンマー4によりボール3を後方に叩き(ハンマー4によりボール3を後方に押圧し)、前記各々の内方突出部23の前面が押し潰される。それにより、ボール3の前後方向のクリアランス(即ち筆記時のカシメ部22内面とボール3との前後方向の隙間)が確保される。前記ハンマーリング工程において、前記各々の内方突出部23の前面の溝23aは完全には潰されず、前記ハンマーリング工程後、前記溝23aは存在する。 In the hammering step, the ball 3 is hit backward by the hammer 4 (the ball 3 is pressed backward by the hammer 4), and the front surface of each of the inwardly projecting portions 23 is crushed. Thereby, a clearance in the front-rear direction of the ball 3 (that is, a clearance in the front-rear direction between the inner surface of the crimped portion 22 and the ball 3 during writing) is ensured. In the hammering step, the groove 23a on the front surface of each inward protrusion 23 is not completely crushed, and the groove 23a exists after the hammering step.

前記ボール受け座形成工程、前記カシメ工程、及び前記ハンマーリング工程により、パイプ式ボールペンチップ1が得られる。 The pipe-type ballpoint pen tip 1 is obtained by the ball receiving seat forming step, the caulking step, and the hammering step.

・ボールペン
図9に、本実施の形態の製造方法で得られるパイプ式ボールペンチップ1を適用したボールペン7を示す。
Ballpoint Pen FIG. 9 shows a ballpoint pen 7 to which the pipe-type ballpoint pen tip 1 obtained by the manufacturing method of the present embodiment is applied.

本実施の形態のボールペン7は、先端部にボール3を回転可能に抱持したボールペンチップ1と、該ボールペンチップ1の後部がその前部に圧入固着されたホルダー71と、該ホルダー71の後部がその先端開口部に圧入固着されたインキ収容筒72と、前記ボールペンチップ1の内部及びホルダー71の内部に収容配置されるスプリング73とからなる。 The ball-point pen 7 of the present embodiment includes a ball-point pen tip 1 that has a ball 3 rotatably held at the tip, a holder 71 in which the rear part of the ball-point pen chip 1 is press-fitted and fixed to the front part, and a rear part of the holder 71 Is composed of an ink containing cylinder 72 press-fitted and fixed to the opening of the tip, and a spring 73 accommodated in the ballpoint pen tip 1 and the holder 71.

・ボールペンチップ
前記ボールペンチップ1のチップ本体は、直円筒状の金属製筒体2よりなる。前記金属製筒体2は、例えば、SUS304、SUS305、SUS321等のオーステナイト系ステンレス鋼により得られる。前記チップ本体の先端近傍内面には、内方への押圧変形により、複数(例えば、4個)の内方突出部23(即ちボール受け座)が周方向に等間隔に形成される。また、チップ本体の先端には、先細状のエッジ部21が予め形成され、前記エッジ部21が周状に内方に押圧変形されることにより、内向きのカシメ部22が形成される。前記内方突出部23の前面と前記カシメ部22の後面との間にはボール3が回転可能に抱持される。前記内方突出部23の相互間には、中心部から径方向外方に延び且つ軸方向に貫通するインキ流通間隙24が形成される。
Ballpoint pen tip The tip body of the ballpoint pen tip 1 is made of a straight cylindrical metal cylinder 2. The said metal cylinder 2 is obtained by austenitic stainless steel, such as SUS304, SUS305, SUS321, for example. A plurality of (for example, four) inward projecting portions 23 (that is, ball receiving seats) are formed at equal intervals in the circumferential direction on the inner surface in the vicinity of the tip of the chip body by inward pressure deformation. Further, a tapered edge portion 21 is formed in advance at the tip of the chip body, and the inward crimping portion 22 is formed by pressing and deforming the edge portion 21 inward in a circumferential shape. A ball 3 is rotatably held between the front surface of the inward projecting portion 23 and the rear surface of the caulking portion 22. An ink flow gap 24 extending radially outward from the central portion and penetrating in the axial direction is formed between the inward protruding portions 23.

・スプリング
前記スプリング73は、前部のロッド部73aと、後部のコイル部73bが一体に連設される。前記インキ流通間隙24に、スプリング73のロッド部73aが挿通される。前記ロッド部73aによって、直接ボール3が前方に付勢され、それにより、ボール3がカシメ部22の内周面に密接される。
Spring In the spring 73, a front rod portion 73a and a rear coil portion 73b are integrally connected. The rod portion 73 a of the spring 73 is inserted into the ink circulation gap 24. The ball 3 is urged directly forward by the rod portion 73 a, whereby the ball 3 is brought into close contact with the inner peripheral surface of the crimping portion 22.

・インキ収容筒
前記インキ収容筒72は、合成樹脂(例えば、ポリプロピレン)の押出成形により得られる、両端が開口された円筒体である。前記インキ収容筒72の内部には、インキと、該インキの消費に伴って前進する高粘度流体からなる追従体が充填される。
Ink storage cylinder The ink storage cylinder 72 is a cylindrical body that is obtained by extrusion molding of a synthetic resin (for example, polypropylene) and is open at both ends. The ink container 72 is filled with a follower made of ink and a high-viscosity fluid that moves forward as the ink is consumed.

・ホルダー
前記ホルダー71は合成樹脂(例えば、ポリプロピレン)の射出成形によって得られる筒状体である。前記ホルダー71は、ボールペンチップ1が取り付けられる先細状の前部と、インキ収容筒72の先端面に当接する鍔部と、インキ収容筒72の先端開口部に圧入される後部とからなる。前記ホルダー71の後部内面には、係止突起が形成され、前記係止突起にスプリング73のコイル部73bの後端が係止される。
Holder The holder 71 is a cylindrical body obtained by injection molding of synthetic resin (for example, polypropylene). The holder 71 includes a tapered front portion to which the ballpoint pen tip 1 is attached, a collar portion that comes into contact with the front end surface of the ink storage cylinder 72, and a rear portion that is press-fitted into the front end opening of the ink storage cylinder 72. A locking protrusion is formed on the inner surface of the rear portion of the holder 71, and the rear end of the coil portion 73b of the spring 73 is locked to the locking protrusion.

・作用
本実施の形態のパイプ式ボールペンチップの製造方法は、ハンマーリング工程の前に、予め各々の内方突出部23の前面に径方向に延びる溝23aを形成し、前記ハンマーリング工程の後に、前記溝23aを完全には潰さず存在させることによって、ハンマー4によるボール3への押圧を強くしても、筆記時にボール3後面への十分なインキ供給を行うことができ、その結果、筆記時、筆跡のカスレや途切れが生じることがなく、潤沢なインキ流出が可能なパイプ式ボールペンチップ1が得られる。
In the manufacturing method of the pipe-type ballpoint pen tip according to the present embodiment, the groove 23a extending in the radial direction is formed in advance on the front surface of each inward projecting portion 23 before the hammering step, and after the hammering step, By providing the groove 23a without being completely crushed, the ink can be sufficiently supplied to the rear surface of the ball 3 at the time of writing even when the hammer 4 is strongly pressed against the ball 3. At this time, the pipe-type ballpoint pen tip 1 capable of abundant ink spillage without the occurrence of shading or interruption of handwriting is obtained.

本実施の形態のパイプ式ボールペンチップの製造方法は、ボール受け座形成工程において、先端面に径方向に延びる複数の突条54を備えた押圧ピンを各々の内方突出部23の前面に押し当てることにより、前記各々の内方突出部23の前面に径方向に延びる溝23aを形成することによって、溝23aの形成を、内方突出部23の形成(ボール受け座の形成)と同時に形成できる。それにより、溝23aを形成するための特別な工程を設ける必要がなく、製造工程の増加を抑えることができる。 In the method of manufacturing the pipe-type ballpoint pen tip according to the present embodiment, in the ball receiving seat forming step, a pressing pin provided with a plurality of ridges 54 extending in the radial direction on the tip surface is pushed to the front surface of each inward protruding portion 23. By forming a groove 23a extending in the radial direction on the front surface of each of the inwardly projecting portions 23, the groove 23a is formed simultaneously with the formation of the inwardly projecting portion 23 (formation of the ball seat). it can. Accordingly, it is not necessary to provide a special process for forming the groove 23a, and an increase in the manufacturing process can be suppressed.

1 ボールペンチップ
2 金属製筒体
21 エッジ部
22 カシメ部
23 内方突出部
23a 溝
23b 窪み部
24 インキ流通間隙
3 ボール
4 ハンマー
5 押圧ピン
51 円錐面
52 円柱面
53 段部
54 突条
6 ポンチ
7 ボールペン
71 ホルダー
72 インキ収容筒
73 スプリング
73a ロッド部
73b コイル部
DESCRIPTION OF SYMBOLS 1 Ball-point pen tip 2 Metal cylinder 21 Edge part 22 Crimp part 23 Inner protrusion part 23a Groove 23b Depression part 24 Ink distribution gap 3 Ball 4 Hammer 5 Pressing pin 51 Conical surface 52 Cylindrical surface 53 Step part 54 Projection 6 Punch 7 Ballpoint pen 71 Holder 72 Ink storage cylinder 73 Spring 73a Rod part 73b Coil part

Claims (2)

金属製筒体の先端近傍の内周面にボール受け座用の複数の内方突出部を形成するボール受け座形成工程と、前記ボール受け座形成工程の後、前記内方突出部の前側の金属製筒体の先端開口部にボールを挿入し、金属製筒体の先端の先細状のエッジ部を内方に円周状に折り曲げることによりカシメ部を形成するカシメ工程と、前記カシメ工程の後、ボールをハンマーで後方に押圧し、ボールを内方突出部の前面に押し付けることにより、筆記時のカシメ部内面とボールとの前後方向の隙間を確保するハンマーリング工程とからなるパイプ式ボールペンチップの製造方法であって、前記ハンマーリング工程の前に、予め各々の内方突出部の前面に径方向に延びる溝を形成し、前記ハンマーリング工程の後に、前記溝を完全には潰さず存在させることを特徴とするパイプ式ボールペンチップの製造方法。 A ball receiving seat forming step for forming a plurality of inward protruding portions for the ball receiving seat on the inner peripheral surface near the tip of the metal cylinder, and after the ball receiving seat forming step, on the front side of the inner protruding portion A caulking step of forming a caulking portion by inserting a ball into the tip opening of the metal cylinder and bending the tapered edge portion of the tip of the metal cylinder inwardly, and the caulking step After that, a pipe-type ballpoint pen consisting of a hammer ring process that secures a clearance in the front-rear direction between the inner surface of the crimping portion and the ball during writing by pressing the ball backward with a hammer and pressing the ball against the front surface of the inward protruding portion A chip manufacturing method, wherein a groove extending in a radial direction is formed in front of each inward protruding portion in advance before the hammering step, and the groove is not completely crushed after the hammering step. To be present Pipe type ballpoint pen tip manufacturing method characterized by. 前記ボール受け座形成工程において、先端面に径方向に延びる複数の突条を備えた押圧ピンを各々の内方突出部の前面に押し当てることにより、前記各々の内方突出部の前面に径方向に延びる溝を形成する請求項1記載のパイプ式ボールペンチップの製造方法。 In the ball receiving seat forming step, by pressing a pressing pin having a plurality of ridges extending in the radial direction on the front end surface against the front surface of each inward protruding portion, a diameter is applied to the front surface of each inward protruding portion. The pipe type ball-point pen tip manufacturing method according to claim 1, wherein a groove extending in the direction is formed.
JP2009241893A 2009-10-20 2009-10-20 Manufacturing method of pipe-type ballpoint pen tip Expired - Fee Related JP5363941B2 (en)

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