JP2008279672A - Retractable writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a retractable writing utensil, in which the "jolting problem" of a push button during writing is solved and which is so constituted as to arrange a writing pressure cushioning spring in order to improve a writing feeling. <P>SOLUTION: A retaining tube 17 having a spring retaining part 16 is connected with the rear end part of a ball-point pen refill 13. In a push button 22 consisting of a rod-like shaft part 20 and a push-button part 21, by inserting the rod-like shaft part 20 in a fixed cam 8 and a rotating cam 10, a strikingly contact spring retaining member 23 is fixed to the fore end 10b of the rotating cam 10. A second compression coiled sprint 24 is arranged between the spring retaining member 23 and the rotating cam 10. A third compression coiled spring 25 is arranged between the spring retaining part 16 of the retaining tube 17 and the spring retaining member 23. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ノック式筆記具に関する。   The present invention relates to a knock-type writing instrument.

従来より、軸筒内にばねにより後方に付勢して収容した筆記体の筆記先端部を、軸筒に設けた、カム溝と、該カム溝に沿って前後に摺動可能に配設した先端に凹凸状のカムを有した固定カムと、前記カムに噛合うカム受け部を有した回転カムと、固定カムを押圧するためのノック体とで構成されたノック式繰出機構により、軸筒の先端開口部より出没させてなるノック式筆記具は知られている。このノック式筆記具においては、ノック体を押圧するとノック体により固定カムが押圧されて前進し、固定カムの前進により回転カムが連動してカム溝に沿って前進し、回転カムに直接的にまたは間接的に連接した筆記体も連動して前進し、筆記先端部を軸筒の先端開口部から突出する。回転カムは回転してカム溝の係止部に係止して後退を抑制されるので、筆記先端部は軸筒の先端開口部から突出した状態を維持する。筆記先端部を軸筒内に没入させるには、再度ノック体を押圧して回転カムを若干前進させて回転させ、回転カムのカム溝の係止部との係止を解除する。ばねにより後端側へ付勢された筆記体を介して回転カムおよび固定カムは後方へ押圧されるので後退し、筆記体も後退して筆記先端部を軸筒内に没入する。   Conventionally, the writing tip portion of the writing body accommodated by being biased rearward by a spring in the shaft cylinder is provided in the shaft cylinder, and is slidably disposed back and forth along the cam groove. By a knock type feeding mechanism comprising a fixed cam having an uneven cam at the tip, a rotating cam having a cam receiving portion meshing with the cam, and a knock body for pressing the fixed cam, a shaft cylinder is provided. Knock-type writing instruments made to appear and disappear from the tip opening are known. In this knock-type writing instrument, when the knock body is pressed, the fixed cam is pushed forward by the knock body, and the rotating cam moves forward along the cam groove by the advancement of the fixed cam. The indirectly connected cursives also move forward in conjunction with each other, and the writing tip part protrudes from the tip opening part of the shaft tube. Since the rotating cam rotates and is locked to the locking portion of the cam groove and the backward movement is suppressed, the writing tip portion is maintained in a state of protruding from the tip opening portion of the shaft tube. In order to immerse the writing tip portion into the shaft cylinder, the knocking body is pressed again, the rotating cam is slightly advanced and rotated, and the locking with the locking portion of the cam groove of the rotating cam is released. The rotating cam and the fixed cam are pushed backward through the writing body urged to the rear end side by the spring, so that the writing body is also retracted, and the writing leading end is immersed in the shaft cylinder.

ノック体を押圧して筆記体の筆記先端部を軸筒の先端開口部より突出した際には、前記したように回転カムはカム溝の先端に設けた係止部に係止するので、回転カムは後退することなく前進位置を維持するが、ノック体および固定カムは回転カムから離れて後退可能となる。ノック体および固定カムは、回転カムと元の位置との間でカム溝に沿って前後動可能となり「ノック体のがたつき」という問題を有している。この「ノック体のがたつき」を解消するものとして、例えば特開平１０−２６４５８３号の公報により、カム筒（回転カム）の後端とノック部材（ノック体）の前端との間に戻しばねを配設する技術が開示されている。   When the knock body is pressed and the writing tip of the writing body protrudes from the tip opening of the shaft tube, the rotating cam is locked to the locking portion provided at the tip of the cam groove as described above. The cam maintains the forward position without moving backward, but the knock body and the fixed cam can move backward away from the rotating cam. The knock body and the fixed cam can move back and forth along the cam groove between the rotary cam and the original position, and have a problem of “knock of the knock body”. In order to eliminate this “knock of the knock body”, for example, according to Japanese Patent Application Laid-Open No. 10-264583, a return spring is provided between the rear end of the cam cylinder (rotating cam) and the front end of the knock member (knock body). A technique for disposing the above is disclosed.

しかし、この技術においては、ノック部材（ノック体）が押圧されて、軸筒内に収容された筆記体の筆記先端部が軸筒の先端開口部より突出した状態でもノック体は元の位置に戻っているので、例えば筆記具を衣服等のポケットに挿着した際に、誤ってノック体を押圧してしまうと、筆記体の筆記先端部を軸筒の先端開口部より突出した状態であることが、筆記具の頭部を見ただけでは判別できないという問題がある。そのために、筆記先端部が布地等と接触し、筆記体に充填されたインキが布地等に染み渡り、衣類等をインキで汚してしまうおそれがある。   However, in this technique, even when the knock member (knock body) is pressed and the writing tip portion of the writing body accommodated in the shaft tube protrudes from the tip opening of the shaft tube, the knock body remains in its original position. Since it is back, for example, when a writing instrument is inserted into a pocket such as clothing, if the knocking body is accidentally pressed, the writing tip of the writing body is projected from the tip opening of the shaft tube. However, there is a problem that it cannot be determined only by looking at the head of the writing instrument. For this reason, the writing tip may come into contact with the fabric or the like, the ink filled in the writing body may permeate the fabric or the like, and the clothing or the like may be stained with the ink.

ところで、軸筒内にボールペンレフィルを収容した構造の筆記具においては、筆記時における書き味を改善するために、筆記時における筆圧を緩衝するものとして筆圧緩衝用スプリングを備えた構造が従来より多数提案されており、カム溝とノック体と回転カムとで構成したノック式繰出機構を配設したノック式筆記具においても、実開昭５７−１６３３７６号の公報により、軸筒内に押出機構を備えた押出式ボールペンにおいて、押出機構と軸筒内に収容したボールペンレフィルとの間に、ボールペンレフィルを軸筒内に引込むためのばねよりも強い弾発力の筆圧緩衝用弾性部材を介在させた「押出式ボールペン」に係る考案が提案されている。   By the way, in a writing instrument having a structure in which a ballpoint pen refill is accommodated in a shaft tube, in order to improve the writing quality at the time of writing, a structure having a spring for buffering pressure as a buffer for writing pressure at the time of writing has been conventionally used. A number of proposals have been made, and even in a knock-type writing instrument provided with a knock-type feeding mechanism composed of a cam groove, a knock body, and a rotating cam, according to the publication of Japanese Utility Model Publication No. 57-163376, an extrusion mechanism is provided in the shaft cylinder. In the extrusion ballpoint pen provided, an elastic member for buffering the pressure of the pen that is stronger than the spring for drawing the ballpoint pen refill into the shaft tube is interposed between the push-out mechanism and the ballpoint pen refill accommodated in the shaft tube. Further, a device related to an “extrusion type ballpoint pen” has been proposed.

しかし、従来より知られている、軸筒内にばねにより後方に付勢して収容した筆記体の筆記先端部を、軸筒に設けた、軸筒の内壁面に形成したカム溝と、該カム溝に沿って前後に摺動可能に配設した先端に凹凸状のカムを有した固定カムと前記カムに噛合うカム受け部を有した回転カムと、固定カムを押圧するためのノック体で構成されたノック式繰出機構により、軸筒の先端開口部より出没させてなるノック式筆記具において、前記したノック体の「がたつき問題」を解消し、かつ筆記時における筆圧を緩衝する構造を有したものはなかった。
特開平１０−２６４５８３号公報 実開昭５７−１６３３７６号公報 However, a cam groove formed on the inner wall surface of the shaft cylinder, which is provided in the shaft cylinder, has a writing tip portion of the writing body which is conventionally known and biased backward by a spring in the shaft cylinder, A fixed cam having a concavo-convex cam at the front end thereof slidably disposed along the cam groove, a rotating cam having a cam receiving portion meshing with the cam, and a knock body for pressing the fixed cam In the knock-type writing instrument that is projected and retracted from the opening at the tip of the shaft cylinder by the knock-type feeding mechanism constituted by the above, the above-described “rareness problem” of the knock body is solved and the writing pressure at the time of writing is buffered. None had a structure.
JP-A-10-264583 Japanese Utility Model Publication No. 57-163376

本発明は、軸筒内にばねにより後方に付勢して収容した筆記体の筆記先端部を、軸筒に設けた、軸筒の内壁面に形成したカム溝と、該カム溝に沿って前後に摺動可能に配設した先端に凹凸状のカムを有した固定カムと前記カムに噛合うカム受け部を有した回転カムと、固定カムを押圧するためのノック体で構成されたノック式繰出機構により、軸筒の先端開口部より出没させるノック式筆記具において、筆記時におけるノック体の「がたつき問題」を解消し、かつ書き味を向上するための筆圧緩衝用スプリングを配した構造としたノック式筆記具を提案するものである。<BR> The present invention includes a cam groove formed on an inner wall surface of a shaft cylinder provided on the shaft cylinder, with a writing tip portion of a writing body accommodated by being biased rearward by a spring in the shaft cylinder, along the cam groove Knock composed of a fixed cam having a concave-convex cam at the tip disposed slidably forward and backward, a rotating cam having a cam receiving portion meshing with the cam, and a knock body for pressing the fixed cam With a knock-type writing instrument that protrudes and retracts from the opening at the tip of the shaft cylinder, a writing pressure buffering spring is provided to eliminate the `` shaking problem '' of the knocked body during writing and improve the writing quality. We propose a knock-type writing instrument with the above structure. <BR>

本発明は、
「１．軸筒内にばねにより後方に付勢して収容した筆記体の筆記先端部を、軸筒に設けた、カム溝と、該カム溝に沿って前後に摺動可能に配設した先端に凹凸状のカムを有した固定カムと、前記カムに噛合うカム受け部を有した回転カムと、固定カムを押圧するためのノック体とで構成されたノック式繰出機構により、軸筒の先端開口部より出没させるノック式筆記具であって、前記筆記体にばね受け部を有した保持筒を連接し、前記ノック体を棒状軸部と該棒状軸部の外径より大径な外径を有するノック部とで構成し、棒状軸部を固定カムおよび回転カム内に挿通し、ノック部を固定カムの後方に位置させてノック体を設けるとともに、回転カムより前方の位置の棒状軸部に、回転カムに当接可能なばね受け部を設け、一定のたわみ量に対する弾発力が前記筆記体を後方に付勢する第１のばねと同等若しくは弱い第２のばねを、一端をノック体に設けたばね受け部に他端を回転カムの内壁面に当接させて設け、第１のばねより強い第３のばねを、一端をノック体に設けたばね受け部に他端を保持等のばね受け部に当接させて設けて、ノック体のばね受け部を回転カムに当接し、ノック体のノック部の少なくとも一部を軸筒の後端から外方に突出し、ノック部の前方端部と固定カムの後端とを離間し、ノック体の押圧により、ノック体のノック部が固定カムに当接してノック体のばね受け部が回転カムから離間した状態で固定カムと回転カムを前進させ、筆記体の筆記先端部が軸筒の先端開口部より突出するようにしたことを特徴とする、ノック式筆記具。」
である。 The present invention
“1. The writing tip portion of the writing body accommodated by being biased rearward by a spring in the shaft cylinder is provided on the shaft cylinder, and is slidably disposed back and forth along the cam groove. By a knock type feeding mechanism comprising a fixed cam having an uneven cam at the tip, a rotating cam having a cam receiving portion meshing with the cam, and a knock body for pressing the fixed cam, a shaft cylinder is provided. A knock-type writing instrument that is projected and retracted from a front end opening of the head, wherein a holding cylinder having a spring receiving portion is connected to the writing body, and the knock body has an outer diameter larger than an outer diameter of the rod-shaped shaft portion and the rod-shaped shaft portion. A knock portion having a diameter, a rod-shaped shaft portion is inserted into the fixed cam and the rotating cam, a knock body is provided with the knock portion positioned behind the fixed cam, and a rod-shaped shaft at a position in front of the rotating cam. A spring receiving part that can contact the rotating cam is provided on the A second spring having an elastic force equal to or weaker than the first spring that urges the writing body backward is brought into contact with a spring receiving portion provided at one end of the knock body and the other end abutted against the inner wall surface of the rotating cam. A third spring stronger than the first spring is provided with one end abutting on a spring receiving portion provided on the knock body and the other end abutting against a spring receiving portion such as holding, and the spring receiving portion of the knock body is rotated. Abutting the cam, protruding at least a part of the knock portion of the knock body outward from the rear end of the shaft cylinder, separating the front end portion of the knock portion and the rear end of the fixed cam, and by knocking the knock body, The fixed cam and the rotating cam are advanced in a state where the knock portion of the body contacts the fixed cam and the spring receiving portion of the knock body is separated from the rotating cam, and the writing tip portion of the writing body projects from the tip opening portion of the shaft tube. Knock-type writing instrument characterized by doing so. "
It is.

本発明のノック式筆記具においては、筆記体を後方へ付勢するための第１のばねと、筆記体に連接した保持筒の第１ばね受け部とノック体に設けたばね受け部との間に配設する第３のばねの強さ関係が重要であり、第３のばねの方が強く、すなわち一定のたわみ量に対する弾発力が大きくなければならない。また、ノック体の非押圧時で回転カムおよび固定カムがカム溝の後方に位置した通常の状態において、筆記体の筆記先端部が軸筒の開口端部より突出しないようにばねの仕様を各々選定して設ける必要がある。   In the knock type writing instrument of the present invention, the first spring for urging the writing body backward, and the first spring receiving part of the holding cylinder connected to the writing body and the spring receiving part provided on the knocking body. The strength relationship of the third spring to be disposed is important, and the third spring must be stronger, that is, the elastic force for a certain amount of deflection must be large. Also, in the normal state where the rotating cam and fixed cam are located behind the cam groove when the knock body is not pressed, the spring specifications are set so that the writing tip of the writing body does not protrude from the opening end of the shaft cylinder. It is necessary to select and provide.

本発明における第３のばねは、緩衝用ばねとしての役目を果たすとともに、筆記体の筆記先端部を軸筒の先端開口部に没入した際にノック体を元の位置に後退させるためのものである。しかし、ノック体が第３のばねの弾発力を受けて後退すると、強い荷重で回転カムに衝接し、回転カムや固定カムが損傷する可能性がある。この懸念事項を解消するために、ノック体のばね受け部と回転カムを離間させ、第３のばねの弾発力より弱い弾発力の第２のばねで回転カムを作動させる。   The third spring in the present invention serves as a buffer spring and is used to retract the knock body to its original position when the writing tip of the writing body is immersed in the tip opening of the shaft cylinder. is there. However, if the knock body is retracted by receiving the elastic force of the third spring, it may come into contact with the rotating cam with a strong load, and the rotating cam or the fixed cam may be damaged. In order to eliminate this concern, the spring receiving portion of the knock body and the rotating cam are separated from each other, and the rotating cam is operated by the second spring having a spring force weaker than the spring force of the third spring.

本発明においては固定カムとノック体を、固定カムの後端とノック体のノック部の前方端部とが当接しないように離間させて各々を配設するが、その理由は、回転カムの固定カムに対する回転をスムーズなものとするためである。そのために、筆記体の筆記先端部が軸筒の先端開口部から突出した状態または没入した状態において、固定カムは軸筒の後方へ前記離間距離分の後退が可能となりがたつきが生じてしまう。離間距離を短くすればするほど固定カムのがたつきの距離は短くなるので短くする必要があるが、離間距離を０にすることはできない。その理由は、ノック体を押圧して固定カムと回転カムを前進させ、筆記体の筆記先端部を軸筒の先端開口部より出没させるために、回転カムを固定カムに対して回転させる必要があるが、離間していないと、ノック体のノック部とノック体に設けたばね受け部により回転カムと固定カムは挟持された状態で回転カムは固定カムに対して回転しなければならなく、第３のばねの作用により回転カムと固定カムは強い力で当接するので、回転カムが回転し難くなったり、回転カムの回転の際に、固定カムのカムや回転カムのカム受け部を損傷するおそれが生じるからである。   In the present invention, the fixed cam and the knock body are separated from each other so that the rear end of the fixed cam and the front end portion of the knock portion of the knock body do not come into contact with each other. This is for smooth rotation with respect to the fixed cam. Therefore, in a state where the writing tip of the writing body protrudes from or is immersed in the tip opening of the shaft tube, the fixed cam can be moved backward by the separation distance to the rear of the shaft tube, and rattling occurs. . The shorter the separation distance, the shorter the rattling distance of the fixed cam. Therefore, it is necessary to shorten the distance, but the separation distance cannot be reduced to zero. The reason is that it is necessary to rotate the rotating cam with respect to the fixed cam in order to push the knocking body to advance the fixed cam and the rotating cam, and to cause the writing tip of the writing body to protrude from the tip opening of the shaft tube. However, if they are not separated, the rotating cam must rotate with respect to the fixed cam while the rotating cam and the fixed cam are sandwiched by the knock portion of the knock body and the spring receiving portion provided on the knock body. Since the rotating cam and the fixed cam come into contact with each other with a strong force by the action of the spring 3, the rotating cam becomes difficult to rotate, or the rotating cam rotates and damages the fixed cam and the cam receiving portion of the rotating cam. This is because fears arise.

本発明のノック式筆記具は前記したような構造なので、筆記体の筆記先端部が軸筒の先端開口部から突出した状態においては、第３のばねにより、ノック体は後方へ付勢された状態でノック体に設けたばね受け部が回転カムに当接し、回転カムはカム溝の係止部に係止してるのでノック体が軸筒内を前後に摺動することがなく前後にがたつくことはない。また、ノック体は前進した位置に保持されるので、衣服等のポケットに挿着した際に、筆記体の筆記先端部を軸筒の先端開口部より突出した状態であることが、ノック体の軸筒からの突出量を見ただけで判別することができる。   Since the knock type writing instrument of the present invention has the structure as described above, the knock body is biased rearward by the third spring when the writing tip of the writing body protrudes from the tip opening of the shaft cylinder. The spring receiving portion provided on the knock body abuts the rotating cam, and the rotating cam is locked to the locking portion of the cam groove, so that the knock body does not slide back and forth within the shaft cylinder. Absent. In addition, since the knock body is held at the advanced position, it is confirmed that the writing tip portion of the writing body protrudes from the tip opening portion of the shaft cylinder when inserted into a pocket such as clothes. It can be determined by just looking at the amount of protrusion from the barrel.

また、筆記体の筆記先端部が軸筒の先端開口部から突出した状態の際には、第３のばねが筆記時における筆圧を緩衝する緩衝用ばねとして作用するので、筆記中の筆圧が高筆圧の状態で長時間筆記しても、疲労を軽減することができる。   In addition, when the writing tip of the writing body protrudes from the tip opening of the shaft tube, the third spring acts as a buffering spring that buffers the writing pressure at the time of writing. However, fatigue can be reduced even if writing is performed for a long time in a state of high writing pressure.

筆記体の筆記先端部を軸筒の先端開口部から出没する際に、第３のばねの作用によりノック体に設けたばね受け部が回転カムに衝接し、その衝接により回転カムと固定カムは強い力で当接するが、本発明は前記したような構造なので、筆記体の筆記先端部を軸筒の先端開口部から出没させるため出没動作時に、前記ばねの作用による回転カムや固定カムへの強い衝撃力がそのままかかることがないので、前記部材を損傷するおそれがない。   When the writing tip of the writing body protrudes and retracts from the tip opening of the shaft tube, the spring receiving portion provided on the knock body comes into contact with the rotating cam by the action of the third spring, and the rotating cam and the fixed cam are Although it abuts with a strong force, since the present invention is structured as described above, the writing tip portion of the writing body is caused to protrude and retract from the tip opening portion of the shaft tube, so that the rotating cam and the fixed cam by the action of the spring at the time of the retracting operation. Since a strong impact force is not applied as it is, there is no possibility of damaging the member.

本発明のノック式筆記具は、従来より知られている、筆記体の後方の軸筒の内壁面に形成したカム溝と、該カム溝に沿って前後に摺動可能に配設した先端に凹凸状のカムを有した固定カムと前記カムに噛合うカム受け部を有した回転カムと、固定カムを押圧するためのノック体で構成されたノック式繰出機構を軸筒内に設けたものである。   The knock type writing instrument of the present invention has a conventionally known cam groove formed on the inner wall surface of the shaft cylinder behind the writing body, and irregularities at the tip that is slidable back and forth along the cam groove. A knock type feeding mechanism comprising a fixed cam having a cam-like cam, a rotating cam having a cam receiving portion meshing with the cam, and a knock body for pressing the fixed cam. is there.

本実施例を図面を用いて説明するが、ノック式筆記具として軸筒内にボールペンレフィルを収容したノック式ボールペンを例にあげて説明するが、これに限定されるものではない。図１は、本実施例のノック式ボールペンの縦断面図である。図２は、図１における要部の拡大図である。図３は、本実施例のノック式ボールペンにおける動作を示し、ノック体を押圧した当初の状態を示した図である。 図４は、本実施例のノック式ボールペンにおける動作を示し、筆記体の筆記先端部が軸筒の先端開口部より突出して内壁に当接した状態を示した図である。図５は、本実施例のノック式ボールペンにおける動作を示し、回転カムが固定カムに対して回転するときの状態を示した図である。図６は、本実施例のノック式ボールペンにおいて、筆記体の筆記先端部が軸筒の先端開口部より突出した状態を維持した状態を示した図である。   Although this embodiment will be described with reference to the drawings, a knock type ballpoint pen in which a ballpoint pen refill is accommodated in a shaft cylinder will be described as an example of a knock type writing instrument, but the present invention is not limited to this. FIG. 1 is a longitudinal sectional view of the knock type ballpoint pen of the present embodiment. FIG. 2 is an enlarged view of a main part in FIG. FIG. 3 is a view showing an operation of the knock type ballpoint pen of the present embodiment and showing an initial state in which the knock body is pressed. FIG. 4 shows the operation of the knock type ballpoint pen of the present embodiment, and shows a state in which the writing tip portion of the writing body protrudes from the tip opening portion of the shaft tube and contacts the inner wall. FIG. 5 shows the operation of the knock type ballpoint pen of the present embodiment, and shows the state when the rotating cam rotates with respect to the fixed cam. FIG. 6 is a view showing a state where the writing tip of the writing body is protruded from the tip opening of the shaft cylinder in the knock type ballpoint pen of the present embodiment.

本実施例のノック式ボールペン１は、図１および図２に示すように、軸筒２を、先端開口部３を有する口先筒２ａと前軸２ｂと後軸２ｃとで構成し、口先筒２ａと前軸２ｂが、前軸２ｂと後軸２ｃとがそれぞれ着脱自在に螺着して取付けてある。口先筒２ａの先端内壁面には、軸径方向を平坦とした段部４を形成してある。前軸２ｂにはグリップ５を装着してある。後軸２ｃには、従来のノック式の繰出機構を有したノック式ボールペンと同様に、後軸の内壁面にカム溝６を形成し、先端に山型状の凹凸からなるカム７を有した固定カム８と、前記カム面に噛合うカム受け部９を有した回転カム１０を前記カム溝６に沿って摺動可能に配設してある。回転カム１０には、固定カム８内に挿通する軸部１０ａを設けてあり、軸部１０ａは固定カム８に対して摺動可能に配してある。     As shown in FIG. 1 and FIG. 2, the knock type ballpoint pen 1 of this embodiment comprises a shaft cylinder 2 including a tip cylinder 2a having a front end opening 3, a front shaft 2b, and a rear shaft 2c. The front shaft 2b and the front shaft 2b and the rear shaft 2c are detachably screwed to each other. A stepped portion 4 having a flat axial diameter direction is formed on the inner wall surface at the tip of the tip tube 2a. A grip 5 is attached to the front shaft 2b. The rear shaft 2c has a cam groove 6 formed on the inner wall surface of the rear shaft and a cam 7 formed of a mountain-shaped unevenness at the tip, similarly to a knock type ballpoint pen having a conventional knock type feeding mechanism. A rotating cam 10 having a fixed cam 8 and a cam receiving portion 9 meshing with the cam surface is slidably disposed along the cam groove 6. The rotating cam 10 is provided with a shaft portion 10 a that is inserted into the fixed cam 8, and the shaft portion 10 a is arranged to be slidable with respect to the fixed cam 8.

軸筒２内には、筆記先端部となるボールペンチップ１１をインキ（図示せず）を収容したインキ収容筒１２の先端に装着してなる筆記体としてのボールペンレフィル１３を収容し、一端を口先筒２ａの内壁面に他端をボールペンレフィル１３に形成した外方に突出した突出部１４に当接して配した第１の圧縮コイルばね１５により後方（繰出機構側）に付勢してある。この第１の圧縮コイルばね１５はノック式ボールペンにおいて一般的に採用されているものである。ボールペンレフィル１３の後端部には、ばね受け部１６を有した保持筒１７を連接してある。   The shaft cylinder 2 accommodates a ballpoint pen refill 13 as a writing body in which a ballpoint pen tip 11 serving as a writing tip is attached to the tip of an ink containing cylinder 12 containing ink (not shown), and one end of the pen The other end of the cylinder 2a is urged rearward (on the feeding mechanism side) by a first compression coil spring 15 disposed in contact with an outwardly projecting protrusion 14 formed on the ballpoint pen refill 13. The first compression coil spring 15 is generally employed in a knock type ballpoint pen. A holding cylinder 17 having a spring receiving portion 16 is connected to the rear end portion of the ballpoint pen refill 13.

前記した固定カム８は前後を貫通した貫通孔１８を有しており、回転カム１０の軸部１０ａを前記貫通孔１８に挿入してある。また、回転カム１０も軸部１０ａを含んで前後に貫通した貫通孔１９を有している。棒状軸部２０と該棒状軸部２０の外径より大径な外径を有したノック部２１とで構成したノック体２２を、棒状軸部２０を固定カム８と回転カム１０の軸部１０ａおよび回転カム１０に挿通し、ノック体２２の一端を後軸２ｃの後端より突出させて後軸２ｃ内に配設してある。棒状軸部２０の前方端には、前記回転カム１０の前端１０ｂに当接させてばね受け部材２３を固着してある。また、回転カム１０内には、一端を回転カム１０の内壁面に当接し他端を前記ばね受け部材２３に当接させて、一定のたわみ量に対する弾発力が前記第１の圧縮コイルばね１５よりは弱い第２の圧縮コイルばね２４を配設してある。   The fixed cam 8 has a through hole 18 penetrating the front and rear, and the shaft portion 10 a of the rotating cam 10 is inserted into the through hole 18. The rotary cam 10 also has a through-hole 19 that penetrates forward and backward including the shaft portion 10a. A knock body 22 composed of a rod-shaped shaft portion 20 and a knock portion 21 having an outer diameter larger than the outer diameter of the rod-shaped shaft portion 20 is used. The rod-shaped shaft portion 20 is a fixed cam 8 and a shaft portion 10a of the rotating cam 10. Further, the knock body 22 is inserted into the rotary cam 10 so that one end of the knock body 22 protrudes from the rear end of the rear shaft 2c and is disposed in the rear shaft 2c. A spring receiving member 23 is fixed to the front end of the rod-shaped shaft portion 20 in contact with the front end 10 b of the rotary cam 10. Further, one end of the rotary cam 10 is brought into contact with the inner wall surface of the rotary cam 10 and the other end is brought into contact with the spring receiving member 23 so that the elastic force with respect to a certain amount of deflection is the first compression coil spring. A second compression coil spring 24 weaker than 15 is provided.

また、前記保持筒１７とばね受け部材２３との間にも、一端を保持筒１７のばね受け部１６に当接し、他端を受け部材２３の前端面に当接させて、一定のたわみ量に対する弾発力が第１の圧縮コイルばね１３よりも強い荷重の弾発力を有する第３の圧縮コイルばね２５を設けてある。本実施例では、第３の圧縮コイルばね２５は略自然長状態で、第１の圧縮コイルばね１５は圧縮状態で設けてあり、第１および第３の圧縮コイルばねの選定には注意が必要である。第２の圧縮コイルばね２４は圧縮状態で設けてあるが、固定カム８、回転カム１０およびノック体２２で構成されるノック式繰出機構を構成する１つの系として前記第１および第３の圧縮コイルばねとは独立して設けてある。   Further, between the holding cylinder 17 and the spring receiving member 23, one end is brought into contact with the spring receiving portion 16 of the holding cylinder 17 and the other end is brought into contact with the front end face of the holding member 23 so that a certain deflection amount is obtained. A third compression coil spring 25 having a resilient force with a load greater than that of the first compression coil spring 13 is provided. In the present embodiment, the third compression coil spring 25 is provided in a substantially natural length state, and the first compression coil spring 15 is provided in a compression state, and care must be taken when selecting the first and third compression coil springs. It is. Although the second compression coil spring 24 is provided in a compressed state, the first and third compression springs as one system constituting a knock-type feeding mechanism constituted by the fixed cam 8, the rotating cam 10, and the knock body 22. It is provided independently of the coil spring.

本実施例のノック式ボールペン１における動作を図３〜図６を用いて説明すると、先ず図３に示すように、ノック体２２のノック部２１を押圧すると、ノック体２２が前進し、固定カム８の後端部に当接し、ノック体２２に固着したばね受け部材２３は、回転カム１０の前端１０ｂより離間する。保持筒１７のばね受け部１６とノック体２２の棒状軸部２０に固着したばね受け部材２３との間に配設した第３の圧縮コイルばね２５は、前記したように、ボールペンレフィル１３を後方へ付勢する第１の圧縮コイルばね１５より一定のたわみ量に対する弾発力が強いため、第３の圧縮コイルばね２５をさらに圧縮することなく、若干ボールペンレフィル１３を前進させる。この時点では、ボールペンレフィル１３のボールペンチップ１１の先端部は口先筒２ａの先端開口部３より突出しない。   The operation of the knock type ballpoint pen 1 of this embodiment will be described with reference to FIGS. 3 to 6. First, as shown in FIG. 3, when the knock portion 21 of the knock body 22 is pressed, the knock body 22 moves forward, and the fixed cam. The spring receiving member 23 that is in contact with the rear end portion 8 and is fixed to the knock body 22 is separated from the front end 10 b of the rotary cam 10. As described above, the third compression coil spring 25 disposed between the spring receiving portion 16 of the holding cylinder 17 and the spring receiving member 23 fixed to the rod-shaped shaft portion 20 of the knock body 22 moves the ball-point refill 13 backward. Since the elastic force with respect to a certain amount of deflection is stronger than the first compression coil spring 15 biased toward the first, the ball pen refill 13 is slightly advanced without further compression of the third compression coil spring 25. At this time, the tip of the ball-point pen tip 11 of the ball-point refill 13 does not protrude from the tip opening 3 of the tip cylinder 2a.

さらにノック体２２のノック部２１を押圧すると、図４に示すように、ノック体２２に押圧されて固定カム８と該固定カム８に押圧された回転カム１０がカム溝６に沿って前進し、インキ収容等筒１２の先端段部２６が口先筒２ａの内壁面の段部４に衝接し、ボールペンチップ１１の先端部が口先筒２ａの先端開口部３より突出する。   When the knock portion 21 of the knock body 22 is further pressed, the fixed cam 8 and the rotating cam 10 pressed by the fixed cam 8 are advanced along the cam groove 6 as shown in FIG. The tip step portion 26 of the ink containing cylinder 12 contacts the step portion 4 on the inner wall surface of the tip cylinder 2a, and the tip portion of the ballpoint pen tip 11 protrudes from the tip opening 3 of the tip cylinder 2a.

またさらにノック体２２のノック部２１を押圧することで、図５に示すように、さらに回転カム１０と固定カム８は連動してカム溝６に沿って前進し、回転カム１０がカム溝６から離間して、固定カム８に設けたカム７と、回転カム１０に設けた前記カム７に噛合うカム受け部９との作用により回転しようとする。ノック体２２に固着したばね受け部材２３と保持筒１７は最も接近し、第３の圧縮コイルばね２５は最も圧縮する。インキ収容等筒１２の先端段部２６は、口先筒２ａの内壁面の段部４に衝接するようにしてある。第２の圧縮コイルばね２４は、回転カム１０と固定カム８を押圧し、回転カム１０を回転させる役割を担う。   Further, by pressing the knock portion 21 of the knock body 22, as shown in FIG. 5, the rotating cam 10 and the fixed cam 8 further advance along the cam groove 6 in conjunction with each other, and the rotating cam 10 moves toward the cam groove 6 as shown in FIG. The cam 7 provided on the fixed cam 8 and the cam receiving portion 9 meshing with the cam 7 provided on the rotating cam 10 are separated from each other to rotate. The spring receiving member 23 and the holding cylinder 17 fixed to the knock body 22 are closest to each other, and the third compression coil spring 25 is most compressed. The leading end step portion 26 of the ink containing cylinder 12 contacts the step portion 4 on the inner wall surface of the tip cylinder 2a. The second compression coil spring 24 plays a role of pressing the rotating cam 10 and the fixed cam 8 to rotate the rotating cam 10.

図６に示すように、回転カム１０が、回転して後退し、カム溝６の係止部（図示せず）に係止することで、ボールペンチップ１１の先端部が口先筒２ａの先端開口部３より突出した状態が維持される。このとき、ノック体２２のノック部２１への押圧が解除されると、ノック体２２に固着したばね受け部材２３が第３の圧縮コイルばね２５の弾発力を受けてノック体２２は後退し、ばね受け部材２３は回転カム１０の前端１０ｂに当接する。このとき、インキ収容等筒１２の先端段部２６は、口先筒２ａの内壁面の段部４に衝接している。ノック体２２のノック部２１の前方端部２１ａと固定カム８の後端８ａは離間しており、固定カム８は若干前後に摺動可能となっている。   As shown in FIG. 6, the rotating cam 10 rotates and retracts and engages with an engaging portion (not shown) of the cam groove 6 so that the tip of the ball-point pen tip 11 is opened at the tip of the tip tube 2a. The state protruding from the part 3 is maintained. At this time, when the pressure on the knock portion 21 of the knock body 22 is released, the spring receiving member 23 fixed to the knock body 22 receives the elastic force of the third compression coil spring 25 and the knock body 22 moves backward. The spring receiving member 23 comes into contact with the front end 10 b of the rotary cam 10. At this time, the leading end step portion 26 of the ink containing cylinder 12 is in contact with the step portion 4 on the inner wall surface of the tip cylinder 2a. The front end portion 21a of the knock portion 21 of the knock body 22 and the rear end 8a of the fixed cam 8 are separated from each other, and the fixed cam 8 can slide slightly forward and backward.

ボールペンチップ１１の先端部を口先筒２ａの先端開口部３より没入させるには、従来のノック式の繰出機構と同様に、再度ノック体２２を押圧して回転カム１０を若干前進させて回転させ、回転カム１０のカム溝６の係止部（図示せず）との係止を解除して、第３の圧縮コイルばね２５の弾発力により、ノック体２２、回転カム１０、固定カム８を後方へ摺動し、元の位置に復帰する。   In order to immerse the tip of the ball-point pen tip 11 from the tip opening 3 of the tip cylinder 2a, as with the conventional knock-type feeding mechanism, the knock body 22 is pressed again to rotate the rotary cam 10 slightly forward. The locking body 22 is released from the locking portion (not shown) of the cam groove 6 of the rotating cam 10, and the knocking body 22, the rotating cam 10, and the fixed cam 8 are moved by the elastic force of the third compression coil spring 25. Slide back to return to the original position.

本発明は、軸筒の内壁面に形成したカム溝とノック体と回転カムと固定カムとで構成されたノック式繰出機構を有した、ボールペンやマーカー等のノック式筆記具に採用することができ、筆記時における「筆圧緩衝」を実現したい場合や、筆記時における「ノック体のがたつき」を解消したい場合に採用することができる。また、第３のばねの強さを調整することで、筆記時における「筆記体のがたつき」を防止可能なノック式筆記具としても利用することができる。   INDUSTRIAL APPLICABILITY The present invention can be applied to a knock-type writing instrument such as a ballpoint pen or a marker having a knock-type feeding mechanism constituted by a cam groove, a knock body, a rotating cam, and a fixed cam formed on the inner wall surface of the shaft cylinder. This method can be used when it is desired to realize “writing pressure buffering” at the time of writing, or when it is desired to eliminate “knocking rattling” at the time of writing. Further, by adjusting the strength of the third spring, it can also be used as a knock-type writing instrument capable of preventing “writing rattling” during writing.

本実施例のノック式ボールペンの縦断面図である。It is a longitudinal cross-sectional view of the knock type ball-point pen of a present Example. 図１における要部の拡大図である。It is an enlarged view of the principal part in FIG. 本実施例のノック式ボールペンにおける動作を示し、ノック体を押圧した当初の状態を示した図である。It is the figure which showed the operation | movement in the knock type ball-point pen of a present Example, and showed the initial state which pressed the knock body. 本実施例のノック式ボールペンにおける動作を示し、筆記体の筆記先端部が軸筒の先端開口部より突出して内壁に当接した状態を示した図である。It is the figure which showed the operation | movement in the knock type ball-point pen of a present Example, and showed the state which the writing front-end | tip part of the writing body protruded from the front-end | tip opening part of the axial cylinder, and contacted the inner wall. 本実施例のノック式ボールペンにおける動作を示し、回転カムが固定カムに対して回転するときの状態を示した図である。It is the figure which showed the operation | movement in the knock type ball-point pen of a present Example, and the state when a rotating cam rotates with respect to a fixed cam. 本実施例のノック式ボールペンにおいて、筆記体の筆記先端部が軸筒の先端開口部より突出した状態を維持した状態を示した図である。In the knock type ball-point pen of a present Example, it is the figure which showed the state which maintained the state which the writing front-end | tip part of the writing body protruded from the front-end | tip opening part of the axial cylinder.

符号の説明Explanation of symbols

１ ノック式ボールペン
２ 軸筒
２ａ 口先筒
３ 先端開口部
６ カム溝
７ カム
８ 固定カム
９ カム受け部
１０ 回転カム
１１ ボールペンチップ
１３ ボールペンレフィル
１５ 第１の圧縮コイルばね
１６ ばね受け部
１７ 保持筒
２０ 棒状部
２１ ノック部
２２ ノック体
２３ ばね受け部材
２４ 第２の圧縮コイルばね
２５ 第３の圧縮コイルばね DESCRIPTION OF SYMBOLS 1 Knock-type ball-point pen 2 Shaft cylinder 2a Mouth end cylinder 3 Tip opening 6 Cam groove 7 Cam 8 Fixed cam 9 Cam receiving part 10 Rotating cam 11 Ball-point pen tip 13 Ball-point pen refill 15 First compression coil spring 16 Spring receiving part 17 Holding cylinder 20 Rod-shaped portion 21 Knock portion 22 Knock body 23 Spring receiving member 24 Second compression coil spring 25 Third compression coil spring

Claims (1)

軸筒内にばねにより後方に付勢して収容した筆記体の筆記先端部を、軸筒に設けた、カム溝と、該カム溝に沿って前後に摺動可能に配設した先端に凹凸状のカムを有した固定カムと、前記カムに噛合うカム受け部を有した回転カムと、固定カムを押圧するためのノック体とで構成されたノック式繰出機構により、軸筒の先端開口部より出没させるノック式筆記具であって、前記筆記体にばね受け部を有した保持筒を連接し、前記ノック体を棒状軸部と該棒状軸部の外径より大径な外径を有するノック部とで構成し、棒状軸部を固定カムおよび回転カム内に挿通し、ノック部を固定カムの後方に位置させてノック体を設けるとともに、回転カムより前方の位置の棒状軸部に、回転カムに当接可能なばね受け部を設け、一定のたわみ量に対する弾発力が前記筆記体を後方に付勢する第１のばねと同等若しくは弱い第２のばねを、一端をノック体に設けたばね受け部に他端を回転カムの内壁面に当接させて設け、第１のばねより強い第３のばねを、一端をノック体に設けたばね受け部に他端を保持等のばね受け部に当接させて設けて、ノック体のばね受け部を回転カムに当接し、ノック体のノック部の少なくとも一部を軸筒の後端から外方に突出し、ノック部の前方端部と固定カムの後端とを離間し、ノック体の押圧により、ノック体のノック部が固定カムに当接してノック体のばね受け部が回転カムから離間した状態で固定カムと回転カムを前進させ、筆記体の筆記先端部が軸筒の先端開口部より突出するようにしたことを特徴とする、ノック式筆記具。   The writing tip of the writing body accommodated by being biased rearward by a spring in the shaft tube is provided with a cam groove, and the tip is slidably disposed back and forth along the cam groove. The tip end of the shaft cylinder is opened by a knock-type feeding mechanism composed of a fixed cam having a cam-like cam, a rotating cam having a cam receiving portion meshing with the cam, and a knock body for pressing the fixed cam. A knock-type writing instrument that is projected and retracted from a portion, wherein a holding cylinder having a spring receiving portion is connected to the writing body, and the knock body has an outer diameter larger than an outer diameter of the rod-shaped shaft portion and the rod-shaped shaft portion. It is composed of a knock portion, and the rod-shaped shaft portion is inserted into the fixed cam and the rotating cam, the knock portion is positioned behind the fixed cam, and a knock body is provided. A spring receiving part that can contact the rotating cam is provided, and a spring for a certain amount of deflection is provided. A second spring having a force equal to or weaker than the first spring that biases the writing body rearward, with the other end abutting against the inner wall surface of the rotating cam at the spring receiving portion provided at the knock body; A third spring stronger than the first spring is provided with a spring receiving portion provided at one end of the knock body in contact with a spring receiving portion such as a holding member, and the spring receiving portion of the knock body is contacted with the rotating cam. And at least a part of the knock portion of the knock body protrudes outward from the rear end of the shaft cylinder, the front end portion of the knock portion and the rear end of the fixed cam are separated, and the knock body is knocked by pressing the knock body. The fixed cam and the rotating cam are advanced in a state where the portion abuts on the fixed cam and the spring receiving portion of the knock body is separated from the rotating cam, so that the writing tip of the writing body protrudes from the tip opening of the shaft cylinder. This is a knock-type writing instrument.

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