JPH01135698A - Manufacture of chuck clamp for propelling pencil - Google Patents

Manufacture of chuck clamp for propelling pencil

Info

Publication number
JPH01135698A
JPH01135698A JP29547287A JP29547287A JPH01135698A JP H01135698 A JPH01135698 A JP H01135698A JP 29547287 A JP29547287 A JP 29547287A JP 29547287 A JP29547287 A JP 29547287A JP H01135698 A JPH01135698 A JP H01135698A
Authority
JP
Japan
Prior art keywords
fastener
die
chuck
protrusion
radius
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP29547287A
Other languages
Japanese (ja)
Other versions
JP2543381B2 (en
Inventor
Toru Kitao
徹 北尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Pencil Co Ltd
Original Assignee
Mitsubishi Pencil Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Pencil Co Ltd filed Critical Mitsubishi Pencil Co Ltd
Priority to JP62295472A priority Critical patent/JP2543381B2/en
Publication of JPH01135698A publication Critical patent/JPH01135698A/en
Application granted granted Critical
Publication of JP2543381B2 publication Critical patent/JP2543381B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)

Abstract

PURPOSE: To form a small R having uniform dimensions stably in the vicinity of a position where a fastener touches a chuck by making a groove on the rear surface side at the R of the fastener by means of a protrusion provided on a die. CONSTITUTION: A protrusion 3 on a die 4 has dimensions being set such that it abuts against the root at a flange part 6 on the rear at the R part 2 of a fastener 1. A circumferential groove 9 is made at the root of the flange part 6 on the outer surface of the fastener 1 by the protrusion 3 on the die 4. Consequently, the R part 2 is inflated to the surface side by an amount corresponding to the volume of the groove 9. Since the inner surface part of the fastener 1 is defined by the outer surface at the tapered protrusion 5 of a punch 8 and the surface at the flange part 6 of the fastener 1 is defined by the flat part 7 of the punch 8, these parts are not inflated. Consequently, the outline at the R part 2 of the fastener 1 is inflated outward and the radius of curvature is reduced at the R part 2.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はシャープペンシルのチャック締め具の製造方法
、特に真鎮等の金属製の締め具の開口縁に塑性加工によ
り小さくて均一なアールを付けることのできるチャック
締め具の製造方法に関する。
Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing a chuck fastener for a mechanical pencil, and in particular, to a method for manufacturing a chuck fastener for a mechanical pencil, in particular, forming a small and uniform radius on the opening edge of a fastener made of metal such as a pin. The present invention relates to a method of manufacturing a chuck fastener that can be attached.

(従来の技術) シャープペンシルのチャックの外周部に装着される締め
具はその前端開口縁の近傍をチャックに接触してチャッ
クを締め付けるような形状を有しておシ、チャックと締
め具との摺動によるチャックの摩耗を防ぐために、接触
点の近傍の締め具の前端開口縁にはアールが付けられて
いる。この締め具の前端開口縁のアールが太きいと、特
に樹脂製のチャックの場合、製品寸法のばらつきKよる
チャックに対する締め具の接触点の位置変化が大きくな
って芯の繰り出し量のばらつきがひどくなる欠点があっ
た。又、締め具の接触点近傍のアールが大きいと、チャ
ックに対する締め付は力が弱くなって、締め具に対して
チャックが没入しやすくなるという弊もあった。そこで
接触点近傍のアールが小さく且つ均一な締め具が強く要
望されている。ところで、金JAMの締め具の開口縁に
アールを付ける加工法としては切削加工と塑性加工があ
るが、切削加工によれば困難性が大きく又コスト高にな
るので、一般にダイスとパンチを利用し、ダイスの縁の
丸みに倣って材料を変形させる塑性加工が採用されてい
る。そして製品(締め具)のアールを小さくするには当
然ダイスの縁のグイラジアスを小さくする必要があるが
、ダイスのグイラジアスを小さくすると材料が縁に沿っ
てスムーズに流れにくく、材料が削られてパウダーが発
生するなどして寸法が不安定となり、又、ダイスの負担
も大きくダイスにチッピングが生じやすい弊もあった。
(Prior art) A fastener attached to the outer periphery of a mechanical pencil chuck has a shape in which the vicinity of the opening edge of the front end contacts the chuck and tightens the chuck. To prevent wear of the chuck due to sliding, the front opening edge of the fastener near the contact point is rounded. If the radius of the front end opening edge of this fastener is thick, especially in the case of a resin chuck, the position of the contact point of the fastener with the chuck will change greatly due to variations in product dimensions, resulting in severe variations in the amount of lead delivery. There was a drawback. Further, if the radius near the contact point of the fastener is large, the force of tightening the chuck becomes weak, and the chuck tends to sink into the fastener. Therefore, there is a strong demand for a fastener with a small and uniform radius near the contact point. By the way, cutting and plastic working are the processing methods for rounding the opening edges of gold JAM fasteners, but cutting is very difficult and costly, so dies and punches are generally used. , plastic processing is used to deform the material to follow the roundness of the edge of the die. In order to reduce the radius of the product (fastener), it is of course necessary to reduce the radius of the edge of the die, but if the radius of the die is made small, the material will not flow smoothly along the edge, and the material will be scraped and powdered. This causes the dimensions to become unstable, and the load on the die is also large, making it easy for the die to chip.

又、製品の内径精度を厳しく出すためのパンチによる内
径部のしごきのために材料がパンチに引きずられる現象
が生じてアールを小さくすることは極めて困難であった
In addition, since the inner diameter portion of the product is hardened with a punch to achieve strict inner diameter accuracy, a phenomenon occurs in which the material is dragged by the punch, making it extremely difficult to reduce the radius.

(発明が解決しようとする問題点) 上記の如く、チャックとの接触点近傍に小さくて且つ均
一なアールを有する金属製の締め具を層性加工によって
形成することは従来極めて困難な問題であった。そこで
本発明はかかる問題点の解決を目的とするものである。
(Problems to be Solved by the Invention) As mentioned above, it has been an extremely difficult problem to form a metal fastener with a small and uniform radius near the point of contact with the chuck by layer processing. Ta. Therefore, the present invention aims to solve such problems.

(問題点を解決するための手段) 上記目的を達成するために案出された本願発明のシャー
プペンシルのチャック締め具の製造方法は、円周状に突
部を設けたダイスを用い、当該ダイスの突部を、締め具
におけるチャックに対する接触位置の近傍に設けるアー
ル部の裏面位置に相当する外面側のフランジ部の付根部
に油接してブレスし、当該ダイスの突部によシ締め具の
外面側のフランジ部の付根部に円周状に溝を圧印する工
程を有することを特徴とするものである。
(Means for Solving the Problems) A method for manufacturing a chuck fastener for a mechanical pencil according to the present invention devised to achieve the above object uses a die provided with a protrusion on the circumference. Apply oil to the base of the flange on the outer surface corresponding to the back side of the rounded part provided near the contact position with the chuck of the fastener, and press the protrusion of the die to the base of the fastener. This method is characterized by a step of coining a groove in a circumferential manner at the base of the flange portion on the outer surface side.

(作 用) ダイスに設けた突部によって締め具のアールの裏面側に
溝を圧印することによシ、溝の容積に相当する余肉がア
ール部の表面側へ膨出することになり、アール部はその
曲率半径を縮小する。この場合、締め具の材料がダイス
の緑に沿って流れるために削られてパウダーが発生する
現象は殆ど発生しない。
(Function) By coining a groove on the back side of the rounded part of the fastener using the protrusion provided on the die, extra material corresponding to the volume of the groove bulges out to the front side of the rounded part. The radius portion reduces its radius of curvature. In this case, since the material of the fastener flows along the green of the die, the phenomenon of scraping and generation of powder hardly occurs.

(実施例) 図面に基づき本発明の実施例を以下に詳説する。先ず本
願発明の工程の前工程として絞り成形を行なう。この工
程では比較的大きなグイラジアスのダイスを用いて締め
具のアール形成部の材料の流れをスムーズにしてパウダ
ーの発生を防ぐ。又、パンチによシしときをかけて締め
具の内径精度を出しておく。この前工程の絞シ成形完了
時の締め具の形状は第3図に示すように、締め具<1)
のチャックに対する接触位置近傍、即ち締め具11)の
前端開口縁のアール部(2)の半径が比較的大きい。次
に本願発明の工程を実施する。即ち、第1図に示すよう
に、上面の開口縁に沿って円周状に突部(3)を設けた
ダイス(4)と、締め具(1)の内部に挿入してその外
周面を締め具(1)の内周面に密着させるテーパ状凸部
(5)及び締め具(1)のフランジ部(6)の表面に密
着するフラット部(力を有するパンチ(8)とによって
、締めL(1)に対しプレス加工を施す。この場合、ダ
イス(4)の突部(3)は締め具(1)のアール部(2
)の裏面位置のフランジ部(6)の付根部に当接するよ
う寸法が設定されている。ダイス(4)の突部(3)に
よって締め具(11の外面部のフランジ部(6)の付根
部には第2図に示すように円周状に溝(9)が圧印され
る。この溝(9)の形成によりi+9>の容積に相当す
る余肉がアール部(2)の表面側に膨出する。尚、締め
具(11の内面部はパンチ(8)のテーパ状凸部(5)
の外面によって規制され、又、締め具(1)の7279
部(6)の表面はパンチ(8)のフラット部(7)によ
って規制されるので、これらの部位に余肉が逃げること
はない。従って締め具(1)のアール部(2)の外郭線
は元の外郭線(2点鎖線で示す線)の外側に脹れてアー
ル部(2)の曲率半径が縮小する。
(Example) Examples of the present invention will be described in detail below based on the drawings. First, drawing forming is performed as a pre-process of the process of the present invention. In this process, a relatively large Guirazias die is used to smooth the flow of material around the rounded part of the fastener and prevent the generation of powder. Also, take some time with the punch to ensure the accuracy of the inner diameter of the fastener. As shown in Figure 3, the shape of the fastener upon completion of the drawing process in this pre-process is as follows: fastener<1)
The radius of the rounded portion (2) near the contact position with respect to the chuck, that is, the front end opening edge of the fastener 11) is relatively large. Next, the steps of the present invention are carried out. That is, as shown in Fig. 1, a die (4) is provided with a protrusion (3) circumferentially along the opening edge of the upper surface, and a die (4) is inserted into the inside of the fastener (1) and its outer peripheral surface is The tapered convex part (5) that comes into close contact with the inner circumferential surface of the fastener (1) and the flat part (powerful punch (8)) that comes into close contact with the surface of the flange part (6) of the fastener (1) are used for tightening. Pressing is performed on L (1). In this case, the protrusion (3) of the die (4) is connected to the rounded part (2) of the fastener (1).
) is dimensioned so as to come into contact with the base of the flange (6) on the back side. As shown in FIG. 2, a circumferential groove (9) is coined at the base of the flange (6) on the outer surface of the fastener (11) by the protrusion (3) of the die (4). Due to the formation of the groove (9), the extra thickness corresponding to the volume of i+9> bulges out to the surface side of the rounded part (2).The inner surface of the fastener (11) is connected to the tapered convex part (8) of the punch (8). 5)
7279 of the fastener (1).
Since the surface of the portion (6) is regulated by the flat portion (7) of the punch (8), excess meat will not escape to these portions. Therefore, the outline of the rounded part (2) of the fastener (1) bulges outside the original outline (line indicated by a two-dot chain line), and the radius of curvature of the rounded part (2) is reduced.

(発明の効果) 本願発明のシャープペンシルのチャック締め具の製造方
法は上記の如く、締め具のチャックに対する接触位置の
近傍に小さくて均一な寸法の安定したアールを容易に形
成できる効果がある。これにより製品寸法に多少のばら
つきがあってもチャックに対する締め具の接触点の位置
変化は小さいので芯の繰シ出し歓のばらつきを僅少に抑
えることができる。又、チャックに対する締め具の接触
点の近傍のアールが小さくなることによシ締め付は力が
増大するので、締め具に対するチャックの没入も抑制す
ることができる。
(Effects of the Invention) As described above, the method for manufacturing a mechanical pencil chuck fastener according to the present invention has the effect of easily forming a stable radius of small, uniform dimensions near the contact position of the fastener with the chuck. As a result, even if there is some variation in the product dimensions, the change in the position of the contact point of the fastener with respect to the chuck is small, so variations in the lead feeding speed can be suppressed to a small extent. Further, since the radius near the contact point of the fastener with the chuck becomes smaller, the tightening force increases, so that it is possible to suppress the chuck from sinking into the fastener.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本願発明の実施例の工程を示す断面図、第2図
は工程終了後の締め具の断面図、第3図は本願発明の工
程の前工程終了時の締め具の断面図である。 (1)・・・締め具、(2)・・・アール部、(3)・
・・突部、(4)・・・ダイス、(5)・・・テーパ状
凸部、(6)・・・フランジ部、(7)、フラット部、
(8)・・・パンチ、(9)・・・溝。 特許 出願人 三菱鉛追株式会社
Fig. 1 is a sectional view showing the process of the embodiment of the present invention, Fig. 2 is a sectional view of the fastener after the process is completed, and Fig. 3 is a sectional view of the fastener at the end of the pre-process of the process of the present invention. be. (1)...Fastening tool, (2)...Round part, (3)...
...Protrusion, (4)...Dice, (5)...Tapered convex part, (6)...Flange part, (7), Flat part,
(8)...Punch, (9)...Groove. Patent Applicant: Mitsubishi Sendoi Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 円周状に突部を設けたダイスを用い、当該ダイスの突部
を、締め具におけるチャックに対する接触位置の近傍に
設けるアール部の裏面位置に相当する外面側のフランジ
部の付根部に当接してプレスし、当該ダイスの突部によ
り締め具の外面側のフランジ部の付根部に円周状に溝を
圧印する工程を有することを特徴とするシャープペンシ
ルのチャック締め具の製造方法。
Using a die with a circumferential protrusion, the protrusion of the die is brought into contact with the base of the flange part on the outer surface corresponding to the back surface position of the rounded part provided in the vicinity of the contact position with the chuck of the fastener. 1. A method for producing a mechanical pencil chuck fastener, comprising the steps of: pressing a mechanical pencil with a protrusion, and coining a circumferential groove at the base of a flange on the outer surface of the fastener using a protrusion of the die.
JP62295472A 1987-11-24 1987-11-24 Method for manufacturing check pencil fasteners Expired - Fee Related JP2543381B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62295472A JP2543381B2 (en) 1987-11-24 1987-11-24 Method for manufacturing check pencil fasteners

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62295472A JP2543381B2 (en) 1987-11-24 1987-11-24 Method for manufacturing check pencil fasteners

Publications (2)

Publication Number Publication Date
JPH01135698A true JPH01135698A (en) 1989-05-29
JP2543381B2 JP2543381B2 (en) 1996-10-16

Family

ID=17821040

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62295472A Expired - Fee Related JP2543381B2 (en) 1987-11-24 1987-11-24 Method for manufacturing check pencil fasteners

Country Status (1)

Country Link
JP (1) JP2543381B2 (en)

Also Published As

Publication number Publication date
JP2543381B2 (en) 1996-10-16

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