以下，一面參照圖式一面詳細說明本發明的實施形態。在全圖式對於對應的構成要素標示共通的參照符號。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the whole drawing, common reference signs are indicated for corresponding constituent elements.
圖1為本發明的實施形態所致的自動鉛筆1的縱剖視圖，圖2為圖1的自動鉛筆1的前半部的放大剖視圖，圖3為圖1的自動鉛筆1的後半部的放大剖視圖。1 is a longitudinal cross-sectional view of a mechanical pencil 1 according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the front half of the mechanical pencil 1 of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the rear half of the mechanical pencil 1 of FIG. 1.
自動鉛筆1具有：前軸2；和前軸2的後端部的外周面螺合的後軸3；和前軸2的前端部的外周面螺合的筆頭構件4；以及和後軸3的後端部的內周面嵌合的內筒5。前軸2及後軸3構成軸筒6。此外，亦可將筆頭構件4或內筒5，並也包含後述的轉盤凸輪構件50稱為軸筒6。如後述，自動鉛筆1構成筆芯7從筆頭構件4的前端突出。筆芯7的前端附近藉由引導筆芯7的前端管8被覆蓋。在本說明書，在自動鉛筆1的軸線方向，將筆芯7側規定為「前」側，將與筆芯7側的相反側規定為「後」側。The mechanical pencil 1 has: a front shaft 2; a rear shaft 3 screwed to the outer peripheral surface of the rear end of the front shaft 2; a pen tip member 4 screwed to the outer peripheral surface of the front end of the front shaft 2; and a rear shaft 3 An inner tube 5 fitted with the inner peripheral surface of the rear end. The front axle 2 and the rear axle 3 constitute a shaft cylinder 6. In addition, the pen tip member 4 or the inner tube 5, including the turntable cam member 50 described later, may also be referred to as the shaft tube 6. As will be described later, the mechanical pencil 1 constitutes a refill 7 protruding from the tip of the tip member 4. The vicinity of the tip of the refill 7 is covered by a tip tube 8 that guides the refill 7. In this specification, in the axial direction of the mechanical pencil 1, the side of the refill 7 is defined as the "front" side, and the side opposite to the side of the refill 7 is defined as the "rear" side.
若參照圖2，在軸筒6的前端部之內部，滑件9可在軸線方向滑動，且被配置成可繞軸線旋轉。滑件9，是形成外徑朝向前方段狀變細的圓筒狀。在滑件9的前端部9a安裝有前端管8。又於前端部9a，在前端管8的後方配置有在中央形成有貫穿孔的保持夾頭10。保持夾頭10的貫穿孔，是和筆芯7的外周面滑動接觸，作用暫時地保持筆芯7。2, inside the front end of the shaft cylinder 6, the slider 9 is slidable in the axial direction and is configured to be rotatable around the axis. The slider 9 is formed in a cylindrical shape whose outer diameter is tapered toward the front. A front end tube 8 is attached to the front end portion 9a of the slider 9. In addition, at the front end portion 9a, a holding chuck 10 having a through hole formed in the center is arranged behind the front end tube 8. The through hole of the holding chuck 10 is in sliding contact with the outer peripheral surface of the pen core 7 and functions to temporarily hold the pen core 7.
在滑件9的前端部9a的後方的中間部9b之外周面的後部，尤其在中間部9b的根部分，朝軸線方向突出的抵接件9c與滑件9一體被形成。在前端部9a及中間部9b的外周面，被形成圓筒狀的第1凸輪構件的轉盤凸輪構件50、與被形成環狀的第2凸輪構件的有軌凸輪構件60在軸線方向排列對齊的狀態下被配置。滑件9的前端部9a的一部分比轉盤凸輪構件50的前端部的孔突出。At the rear portion of the outer peripheral surface of the intermediate portion 9b behind the front end portion 9a of the slider 9, particularly at the root portion of the intermediate portion 9b, an abutting piece 9c protruding in the axial direction is integrally formed with the slider 9. On the outer peripheral surfaces of the front end portion 9a and the intermediate portion 9b, the turntable cam member 50 of the first cam member formed in a cylindrical shape and the rail cam member 60 of the second cam member formed in the ring shape are aligned in the axial direction. Is configured in the state. A part of the front end portion 9 a of the slider 9 protrudes from the hole of the front end portion of the turntable cam member 50.
在滑件9之內部配置有：把持筆芯7的滾珠夾頭11及被形成圓筒狀的中繼構件12。滾珠夾頭11具有：被形成圓筒狀的夾扣具13、被配置在夾扣具13內的夾頭本體部14、被形成圓筒狀的夾頭保持部15、以及複數個滾珠16。在夾扣具13的內周面朝向前方形成變寬的錐面。夾頭本體部14沿著中心軸線形成筆芯7的貫穿孔，夾頭本體部14的前端部沿著軸線方向作複數分割。夾頭本體部14的後端部，是藉由夾頭保持部15被保持。夾頭本體部14及夾頭保持部15相對於夾扣具13可在軸線方向移動。複數個滾珠16被配置在夾扣具13的內周面與夾頭本體部14的外周面之間。Arranged inside the slider 9 are a ball chuck 11 holding the pen core 7 and a relay member 12 formed in a cylindrical shape. The ball chuck 11 has a chuck 13 formed in a cylindrical shape, a chuck main body 14 arranged in the chuck 13, a chuck holding portion 15 formed in a cylindrical shape, and a plurality of balls 16. A tapered surface that widens toward the front is formed on the inner peripheral surface of the clip 13. The chuck body portion 14 forms a through hole for the pen core 7 along the central axis, and the front end portion of the chuck body portion 14 is divided in plural along the axial direction. The rear end of the chuck body 14 is held by the chuck holding portion 15. The chuck body part 14 and the chuck holding part 15 are movable in the axial direction with respect to the clip 13. The plurality of balls 16 are arranged between the inner peripheral surface of the clip 13 and the outer peripheral surface of the chuck body 14.
對筆芯7施加了書寫壓時，因為夾頭本體部14與滾珠16一起抵接在圓筒狀的夾扣具13內的錐面，所以，筆芯7是藉由夾頭本體部14被把持。藉此，筆芯7之後退被阻止。另一方，作用朝前方拉出筆芯7的力的時候，因為夾頭本體部14不會受到夾扣具13所致的作用，所以可將筆芯7沒有阻抗地朝前方拉出。亦即，滾珠夾頭11以容許筆芯7的前進並阻止後退地作用。When writing pressure is applied to the refill 7, because the chuck body 14 and the ball 16 abut on the tapered surface of the cylindrical clip 13 together, the refill 7 is held by the chuck body 14 control. As a result, the pen core 7 is prevented from retreating. On the other hand, when a force to pull the pen core 7 forward is applied, the chuck body 14 will not be affected by the clip 13, so the pen core 7 can be pulled forward without resistance. That is, the ball chuck 11 acts to allow the advancement of the pen core 7 and prevent the retreat.
以包圍夾頭本體部14的方式配置線圈彈簧17。線圈彈簧17的後端和夾頭本體部14的外面嵌合，線圈彈簧17的前端，是藉由被形成在夾扣具13的內周面的段部所支撐。線圈彈簧17將夾頭本體部14朝後方彈推，其結果，滾珠夾頭11可維持把持著筆芯7的狀態。The coil spring 17 is arranged so as to surround the chuck body 14. The rear end of the coil spring 17 is fitted to the outer surface of the chuck body 14, and the front end of the coil spring 17 is supported by a segment formed on the inner peripheral surface of the clip 13. The coil spring 17 urges the chuck body 14 to the rear, and as a result, the ball chuck 11 can maintain the state of holding the pen core 7.
夾扣具13的後端部的外周面和中繼構件12的前端部的內周面嵌合。因此，滾珠夾頭11及中繼構件12在滑件9內可在軸線方向上移動。在中繼構件12的軸線方向中的中央部分形成有凸緣部12a。在凸緣部12a的前方，以包圍著中繼構件12的方式配置作為線圈彈簧的凸輪抵接彈簧18。凸輪抵接彈簧18的後端相對於中繼構件12的凸緣部12a被安裝(A部)，凸輪抵接彈簧18的前端被安裝在滑件9的後端部之內壁(B部)。在軸筒6內，凸輪抵接彈簧18將滑件9朝前方彈推。藉此，凸輪抵接彈簧18如後述作用而使被設在滑件9的抵接件9c抵接在凸輪面。中繼構件12的後端部連結於後述的旋轉驅動機構30。在夾頭保持部15的後端部之外周面芯盒19的前端部作嵌合。芯盒19被形成圓筒狀，在內部收容有筆芯7。The outer peripheral surface of the rear end portion of the clip 13 and the inner peripheral surface of the front end portion of the relay member 12 are fitted. Therefore, the ball chuck 11 and the relay member 12 can move in the axial direction within the slider 9. A flange portion 12a is formed in a central portion in the axial direction of the relay member 12. In front of the flange portion 12 a, a cam abutment spring 18 as a coil spring is arranged so as to surround the relay member 12. The rear end of the cam abutment spring 18 is mounted with respect to the flange portion 12a of the relay member 12 (part A), and the front end of the cam abutment spring 18 is mounted on the inner wall (part B) of the rear end of the slider 9 . In the shaft cylinder 6, the cam abutment spring 18 pushes the slider 9 forward. Thereby, the cam abutment spring 18 acts as described later, so that the abutment 9c provided in the slider 9 abuts on the cam surface. The rear end part of the relay member 12 is connected to the rotation drive mechanism 30 mentioned later. The front end of the core box 19 is fitted on the outer periphery of the rear end of the chuck holding portion 15. The core case 19 is formed in a cylindrical shape, and the refill 7 is accommodated inside.
若參照圖3，在軸筒6的後端部，具體而言在內筒5的後端部，作為按壓構件的按壓棒20相對於軸筒6可前後動地被設置。按壓棒20藉由線圈彈簧21朝後方被彈推。在按壓棒20的後端部附近形成有具備筆芯7之補給孔的隔壁部20a。在按壓棒20的後端部之內部，橡皮擦22可裝卸地被安裝。在按壓棒20的後端部之外周面，按壓蓋23可裝卸地被安裝，來保護橡皮擦22不受污染等。按壓棒20嵌合在芯盒19的後端部之外周面。3, at the rear end portion of the shaft cylinder 6, specifically, the rear end portion of the inner cylinder 5, a pressing rod 20 as a pressing member is provided so as to be movable back and forth relative to the shaft cylinder 6. The pressing rod 20 is urged backward by the coil spring 21. In the vicinity of the rear end of the pressing rod 20, a partition wall portion 20a provided with a replenishment hole of the pen core 7 is formed. Inside the rear end of the pressing rod 20, the eraser 22 is detachably installed. On the outer peripheral surface of the rear end of the pressing rod 20, the pressing cover 23 is detachably installed to protect the eraser 22 from contamination and the like. The pressing rod 20 is fitted on the outer peripheral surface of the rear end portion of the core box 19.
藉由朝前方按壓按壓棒20或按壓蓋23的按壓操作，使芯盒19前進。藉此，經由夾頭保持部15朝前方推出夾頭本體部14。伴隨於此，被夾頭本體部14所把持的筆芯7也前進，而作用將筆芯7從前端管8不斷送出。若解除按壓操作所致的按壓，按壓棒20藉由線圈彈簧21的彈推力而後退恢復到原來的位置。The core box 19 is moved forward by pressing the pressing rod 20 or pressing the cover 23 toward the front. Thereby, the chuck body portion 14 is pushed forward through the chuck holding portion 15. Along with this, the pen core 7 held by the chuck body 14 also advances, and the pen core 7 is continuously sent out from the tip tube 8. When the pressing caused by the pressing operation is released, the pressing rod 20 retreats and returns to the original position by the elastic force of the coil spring 21.
此時，夾頭本體部14藉由線圈彈簧17的彈推力而後退。另一方面，筆芯7因為是藉由被配置在滑件9內的保持夾頭10被保持，所以，作為滾珠夾頭11的作用，筆芯7從夾頭本體部14沒有阻抗地被拉出。其結果，筆芯7由於是從前端管8被不斷送出，所以每次進行反覆按壓操作，可將筆芯7按預定量不斷送出。若藉由按壓操作維持讓按壓棒20前進的狀態，則夾頭本體部14從夾扣具13突出，筆芯7的把持成為被解除的狀態。在此狀態，可用指尖等推回從前端管8被不斷送出的狀態的筆芯7。At this time, the chuck main body 14 retreats by the urging force of the coil spring 17. On the other hand, since the pen core 7 is held by the holding chuck 10 arranged in the slider 9, the pen core 7 is pulled from the chuck body 14 without resistance as the ball chuck 11 Out. As a result, since the refill 7 is continuously sent out from the tip tube 8, the refill 7 can be continuously sent out in a predetermined amount every time the pressing operation is repeated. If the state of advancing the pressing rod 20 is maintained by the pressing operation, the chuck main body portion 14 protrudes from the clip 13 and the grip of the pen core 7 is released. In this state, it is possible to push back the refill 7 in a state where it is continuously fed from the tip tube 8 with a fingertip or the like.
圖4為旋轉驅動機構30的放大剖視圖。旋轉驅動機構30被配置在後軸3的內部空間。旋轉驅動機構30被連接在中繼構件12之後端部。在前軸2的後端面與旋轉驅動機構30的前端面之間配置有軸彈簧31，朝後方彈推旋轉驅動機構30。軸彈簧31的彈推力所致的旋轉驅動機構30朝後方的移動，是藉由旋轉驅動機構30之後端面抵接在內筒5的前端面而受到約束。芯盒19貫穿中繼構件12及旋轉驅動機構30的內部，與旋轉驅動機構30遠離。FIG. 4 is an enlarged cross-sectional view of the rotation drive mechanism 30. The rotation drive mechanism 30 is arranged in the internal space of the rear axle 3. The rotation drive mechanism 30 is connected to the rear end of the relay member 12. A shaft spring 31 is arranged between the rear end surface of the front axle 2 and the front end surface of the rotation drive mechanism 30 to urge the rotation drive mechanism 30 backward. The rearward movement of the rotary drive mechanism 30 due to the elastic thrust of the shaft spring 31 is restrained by the rear end surface of the rotary drive mechanism 30 abutting against the front end surface of the inner cylinder 5. The core box 19 penetrates the interior of the relay member 12 and the rotation drive mechanism 30 and is away from the rotation drive mechanism 30.
旋轉驅動機構30具有：被形成圓筒狀的轉子40、作為被形成圓筒狀的第1凸輪形成構件的上凸輪形成構件41、作為被形成圓筒狀的第2凸輪形成構件的下凸輪形成構件42、被形成圓筒狀的圓筒構件43、被形成圓筒狀的轉矩消除器44、以及螺旋狀的緩衝彈簧45。旋轉驅動機構30，是將該等構件形成一體而被單元化。The rotation drive mechanism 30 has a rotor 40 formed in a cylindrical shape, an upper cam forming member 41 as a first cam forming member formed in a cylindrical shape, and a lower cam forming member as a second cam forming member formed in a cylindrical shape. The member 42, a cylindrical member 43 formed in a cylindrical shape, a torque canceller 44 formed in a cylindrical shape, and a helical buffer spring 45. The rotation drive mechanism 30 integrates these components into a unit.
在轉子40的前端部之內周面，中繼構件12的後端部之外周面嵌合。轉子40的前端部附近具有被形成徑稍微大的凸緣狀紙部分，在該部分的後端面形成第1凸輪面40a，在該部分的前端面形成第2凸輪面40b。In the inner peripheral surface of the front end portion of the rotor 40, the outer peripheral surface of the rear end portion of the relay member 12 is fitted. The rotor 40 has a flange-shaped paper portion formed with a slightly larger diameter in the vicinity of the front end portion, a first cam surface 40a is formed on the rear end surface of this portion, and a second cam surface 40b is formed on the front end surface of this portion.
上凸輪形成構件41，是在轉子40的第1凸輪面40a之後方，將轉子40可轉動地作包圍。下凸輪形成構件42嵌合在上凸輪形成構件41的前端部之外周面。在與轉子40的第1凸輪面40a對置的上凸輪形成構件41的前端面形成有作為第1固定凸輪面的固定凸輪面41a。在與轉子40的第2凸輪面40b對置的下凸輪形成構件42的前端部內面形成有作為第2固定凸輪面的固定凸輪面42a。The upper cam forming member 41 rotatably surrounds the rotor 40 behind the first cam surface 40a of the rotor 40. The lower cam forming member 42 is fitted on the outer peripheral surface of the front end portion of the upper cam forming member 41. A fixed cam surface 41a as a first fixed cam surface is formed on the front end surface of the upper cam forming member 41 that faces the first cam surface 40a of the rotor 40. A fixed cam surface 42a as a second fixed cam surface is formed on the inner surface of the front end portion of the lower cam forming member 42 opposed to the second cam surface 40b of the rotor 40.
在上凸輪形成構件41的後端部之外周面嵌合被形成圓筒狀的圓筒構件43。在圓筒構件43的後端部形成有芯盒19可插通的插通孔43a。在圓筒構件43內配置有被形成圓筒狀可在軸線方向上移動的轉矩消除器44。在轉矩消除器44的前端部內面與圓筒構件43的後端部內面之間配置有緩衝彈簧45。緩衝彈簧45經由轉矩消除器44將轉子40朝前方彈推。A cylindrical member 43 formed in a cylindrical shape is fitted on the outer peripheral surface of the rear end portion of the upper cam forming member 41. An insertion hole 43 a through which the core box 19 can be inserted is formed at the rear end of the cylindrical member 43. A torque eliminator 44 that is formed into a cylindrical shape and is movable in the axial direction is arranged in the cylindrical member 43. A buffer spring 45 is arranged between the inner surface of the front end portion of the torque canceller 44 and the inner surface of the rear end portion of the cylindrical member 43. The buffer spring 45 bounces the rotor 40 forward via the torque canceller 44.
於此，中繼構件12，是將根據書寫動作之筆芯7的後退及前進動作(緩衝動作)傳達到旋轉驅動機構30，亦即傳達到轉子40的同時，將藉由緩衝動作所產生的旋轉驅動機構30中的轉子40的旋轉運動傳達到把持筆芯7的狀態的滾珠夾頭11。因此，被滾珠夾頭11所保持的筆芯7也旋轉。Here, the relay member 12 transmits the retreat and forward motion (buffering motion) of the pen core 7 according to the writing motion to the rotation driving mechanism 30, that is, to the rotor 40, and will be generated by the buffer motion at the same time. The rotational movement of the rotor 40 in the rotational drive mechanism 30 is transmitted to the ball chuck 11 in the state of holding the pen core 7. Therefore, the refill 7 held by the ball chuck 11 also rotates.
除了用自動鉛筆1進行書寫時以外，亦即，在筆芯7沒有施加書寫壓時，轉子40，是藉由隔著轉矩消除器44的緩衝彈簧45的彈推力而位在前方。因此，轉子40的第2凸輪面40b抵接在第2固定凸輪面42a而成為咬合的狀態。用自動鉛筆1進行書寫時，亦即，對筆芯7施加書寫壓時，滾珠夾頭11反抗緩衝彈簧45的彈推力而後退，隨之轉子40也後退。因此，轉子40的第1凸輪面40a抵接在第1固定凸輪面41a而成為咬合的狀態。Except when writing with the mechanical pencil 1, that is, when the writing pressure is not applied by the pen core 7, the rotor 40 is positioned forward by the elastic force of the buffer spring 45 via the torque canceller 44. Therefore, the second cam surface 40b of the rotor 40 abuts on the second fixed cam surface 42a to be in an engaged state. When writing with the mechanical pencil 1, that is, when writing pressure is applied to the pen core 7, the ball chuck 11 retreats against the elastic force of the buffer spring 45, and the rotor 40 also retreats. Therefore, the first cam surface 40a of the rotor 40 abuts on the first fixed cam surface 41a to be in an engaged state.
圖5，是依序說明圖1的自動鉛筆1的轉子40的旋轉驅動作用之示意圖，圖6，是接續圖5說明轉子40的旋轉驅動作用之示意圖。圖5及圖6中，在作為轉子40的上側之面的後端面，沿著周向連續地形成鋸齒狀的第1凸輪面40a被形成圓環狀，在作為轉子40的下側之面的前端面，同樣沿著周向連續地鋸齒狀的第2凸輪面40b被形成圓環狀。5 is a schematic diagram illustrating the rotation driving action of the rotor 40 of the mechanical pencil 1 of FIG. 1 in sequence, and FIG. 6 is a schematic diagram illustrating the rotation driving action of the rotor 40 following FIG. 5. In FIGS. 5 and 6, on the rear end surface as the upper surface of the rotor 40, the first cam surface 40a continuously formed in a zigzag shape in the circumferential direction is formed in an annular shape. On the front end surface, the second cam surface 40b, which is also continuously serrated along the circumferential direction, is formed in an annular shape.
在和轉子40的第1凸輪面40a對峙的上凸輪形成構件41的圓環狀之端面也形成有沿著周向連續地被形成鋸齒狀的第1固定凸輪面41a，在和轉子40的第2凸輪面40b對峙的下凸輪形成構件42的圓環狀之端面也形成有沿著周向連續地被形成鋸齒狀的第2固定凸輪面42a。被形成在轉子40的第1凸輪面40a及第2凸輪面40b的各凸輪面、與被形成在上凸輪形成構件41的第1固定凸輪面41a及被形成在下凸輪形成構件42的第2固定凸輪面42a的各凸輪面，是形成間距彼此幾乎為相同。The annular end surface of the upper cam forming member 41 facing the first cam surface 40a of the rotor 40 is also formed with a first fixed cam surface 41a continuously formed in a zigzag shape in the circumferential direction. The annular end surface of the lower cam forming member 42 facing the two cam surfaces 40b is also formed with a second fixed cam surface 42a continuously formed in a zigzag shape along the circumferential direction. The cam surfaces formed on the first cam surface 40a and the second cam surface 40b of the rotor 40 are connected to the first fixed cam surface 41a formed on the upper cam forming member 41 and the second fixed cam surface formed on the lower cam forming member 42 The cam surfaces of the cam surface 42a are formed at almost the same pitch.
圖5(A)表示沒有對筆芯7施加書寫壓時的狀態中的轉子40、上凸輪形成構件41及下凸輪形成構件42的關係。於此狀態，形成轉子40的第2凸輪面40b，是藉由緩衝彈簧45的彈推力對下凸輪形成構件42的第2固定凸輪面42a作抵接。此時，轉子40的第1凸輪面40a與上凸輪形成構件41的第1固定凸輪面41a，被設定成在軸線方向，對凸輪的一齒偏移半位相(半間距)的關係。FIG. 5(A) shows the relationship between the rotor 40, the upper cam forming member 41, and the lower cam forming member 42 in a state when no writing pressure is applied to the pen core 7. As shown in FIG. In this state, the second cam surface 40b forming the rotor 40 is abutted against the second fixed cam surface 42a of the lower cam forming member 42 by the urging force of the buffer spring 45. At this time, the first cam surface 40a of the rotor 40 and the first fixed cam surface 41a of the upper cam forming member 41 are set in the axial direction to shift one tooth of the cam by half a phase (half pitch).
圖5(B)表示為了自動鉛筆1所致的書寫，而對筆芯7施加書寫壓的初期的狀態。於此狀態，轉子40隨著滾珠夾頭11的後退而使緩衝彈簧45收縮進行後退。藉此，轉子40移動到上凸輪形成構件41的第1固定凸輪面41a側。FIG. 5(B) shows the initial state where writing pressure is applied to the pen core 7 for writing by the mechanical pencil 1. In this state, the rotor 40 retracts the cushion spring 45 as the ball chuck 11 retracts. Thereby, the rotor 40 moves to the first fixed cam surface 41 a side of the upper cam forming member 41.
接著，圖5(C)表示進一步對筆芯7施加書寫壓，使轉子40抵接在上凸輪形成構件41的第1固定凸輪面41a而後退的狀態。於此狀態，轉子40的第1凸輪面40a和上凸輪形成構件41的第1固定凸輪面41a嚙合。藉此，轉子40承受相當於第1凸輪面40a的一齒之半位相(半間距)的旋轉驅動。Next, FIG. 5(C) shows a state where writing pressure is further applied to the pen core 7 and the rotor 40 abuts on the first fixed cam surface 41a of the upper cam forming member 41 and retreats. In this state, the first cam surface 40a of the rotor 40 and the first fixed cam surface 41a of the upper cam forming member 41 mesh with each other. Thereby, the rotor 40 receives a half-phase (half pitch) rotation drive corresponding to one tooth of the first cam surface 40a.
此外，畫在圖5及圖6中的轉子40的中央部的○印，表示轉子40的旋轉移動量。而且，在圖5(C)所示的狀態，轉子40的第2凸輪面40b與下凸輪形成構件42的第2固定凸輪面42a，被設定成在軸線方向，對凸輪的一齒偏移半位相(半間距)的關係。In addition, the mark ○ drawn in the center of the rotor 40 in FIGS. 5 and 6 indicates the amount of rotational movement of the rotor 40. Furthermore, in the state shown in FIG. 5(C), the second cam surface 40b of the rotor 40 and the second fixed cam surface 42a of the lower cam forming member 42 are set to be in the axial direction, offset by half from one tooth of the cam. Phase (half pitch) relationship.
接著，圖6(D)表示自動鉛筆1所致的書寫結束，解除對筆芯7的書寫壓的初期的狀態。此時，轉子40藉由緩衝彈簧45的彈推力而前進。藉此，轉子40朝下凸輪形成構件42側移動。Next, FIG. 6(D) shows the initial state where the writing by the mechanical pencil 1 is completed and the writing pressure on the pen core 7 is released. At this time, the rotor 40 advances by the elastic force of the buffer spring 45. Thereby, the rotor 40 moves toward the lower cam forming member 42 side.
接著，圖6(E)表示轉子40藉由緩衝彈簧45的彈推力抵接在上凸輪形成構件41的第1固定凸輪面41a而前進的狀態。此時，轉子40的第2凸輪面40b和下凸輪形成構件42的第2固定凸輪面42a嚙合。藉此，轉子40再次承受相當於第2凸輪面40b的一齒之半位相(半間距)的旋轉驅動。Next, FIG. 6(E) shows a state in which the rotor 40 abuts against the first fixed cam surface 41 a of the upper cam forming member 41 by the urging force of the buffer spring 45 and moves forward. At this time, the second cam surface 40b of the rotor 40 and the second fixed cam surface 42a of the lower cam forming member 42 mesh with each other. Thereby, the rotor 40 is again subjected to a half-phase (half pitch) rotational drive corresponding to one tooth of the second cam surface 40b.
因此，如畫在轉子40的中央部的○印所示，轉子40，是隨著朝向承受書寫壓的轉子40的軸線方向的往復運動，亦即隨著前後動，而承受相當於第1凸輪面40a及第2凸輪面40b的一齒(1間距)的旋轉驅動，並經由滾珠夾頭11，被此把持的筆芯7也同樣被旋轉驅動。因此，藉由書寫所致的轉子40朝軸線方向的1次的前後動，轉子40承受對應凸輪的一齒的旋轉運動，藉由反覆這個動作，筆芯7被依序旋轉驅動。所以，可防止持續書寫的過程中的筆芯7的偏摩耗的情形，而可防止描繪線的粗細或描繪線的濃淡大幅變化的情況。Therefore, as shown by the ○ mark drawn in the center of the rotor 40, the rotor 40 receives the equivalent of the first cam as it reciprocates toward the axial direction of the rotor 40 that bears the writing pressure, that is, as it moves forward and backward. The surface 40a and the second cam surface 40b are rotationally driven by one tooth (one pitch), and the pen core 7 held by the ball chuck 11 is also rotationally driven. Therefore, the rotor 40 moves back and forth in the axial direction one time due to writing, and the rotor 40 receives the rotational movement of one tooth of the corresponding cam. By repeating this movement, the pen core 7 is sequentially rotated and driven. Therefore, it is possible to prevent partial abrasion of the pen core 7 during continuous writing, and to prevent the thickness of the drawing line or the shade of the drawing line from greatly changing.
此外，承受緩衝彈簧45的彈推力而將轉子40朝前方推出的轉矩消除器44讓滑動在其前端面與轉子40的後端面之間產生，來防止轉子40的旋轉運動傳達到緩衝彈簧45的情況。亦即，藉由轉矩消除器44防止轉子40的旋轉運動傳達到緩衝彈簧45的情況，藉此防止阻礙轉子40的旋轉動作的緩衝彈簧45的反扭轉(扭力)的發生的情況。In addition, the torque eliminator 44, which receives the elastic thrust of the buffer spring 45 and pushes the rotor 40 forward, causes sliding between its front end surface and the rear end surface of the rotor 40 to prevent the rotational movement of the rotor 40 from being transmitted to the buffer spring 45 Case. That is, the torque canceller 44 prevents the rotational movement of the rotor 40 from being transmitted to the buffer spring 45, thereby preventing the occurrence of reverse twist (torsion) of the buffer spring 45 that hinders the rotational movement of the rotor 40.
根據以上，自動鉛筆1具有滾珠夾頭11與轉子40，而構成藉由滾珠夾頭11的前後動進行筆芯7的解除及把持，可將筆芯7朝前方不斷送出，滾珠夾頭11被保持在軸筒6內，而形成把持筆芯7的狀態下可繞中心軸線旋轉，並且構成藉由筆芯7的書寫壓所致的隔著滾珠夾頭11之轉子40的前後動讓轉子40旋轉，將轉子40的旋轉運動經由滾珠夾頭11傳達到筆芯7。Based on the above, the mechanical pencil 1 has the ball chuck 11 and the rotor 40, and the ball chuck 11 moves forward and backward to release and hold the pen core 7 so that the pen core 7 can be continuously sent forward, and the ball chuck 11 is It is held in the barrel 6 and can rotate around the central axis in the state of holding the pen core 7, and constitutes the back and forth movement of the rotor 40 through the ball chuck 11 caused by the writing pressure of the pen core 7 to allow the rotor 40 to move forward and backward. Rotation transmits the rotational movement of the rotor 40 to the pen core 7 via the ball chuck 11.
邊參照圖7至圖9，邊針對芯送出的機構及送出量調整機構進行說明。芯送出的機構承受旋轉驅動機構30的轉子40的旋轉驅動力，而作用將筆芯7朝前方不斷送出。With reference to FIGS. 7 to 9, the core feeding mechanism and the feeding amount adjustment mechanism will be described. The core sending mechanism receives the rotation driving force of the rotor 40 of the rotation driving mechanism 30, and acts to continuously send the pen core 7 forward.
圖7為轉盤凸輪構件50的立體圖。轉盤凸輪構件50在圖7被配置成上方成為自動鉛筆1之後側。轉盤凸輪構件50為被形成圓筒狀的構件，且具有：在軸線方向位於中央的把持部50a、在把持部50a的後方，被形成較把持部50a更小径的小徑部50b、被形成在小徑部50b的前方的凸緣部50c、被形成在凸緣部50c的後端面的2個嵌合突起50d、以及被形成在小徑部50b的後端面的轉盤凸輪51。2個嵌合突起50d在中心軸線周圍對稱被配置。把持部50a的前方被形成小徑，從把持部50a朝前方延伸的2個卡止突起50e在中心軸線周圍對稱被形成。FIG. 7 is a perspective view of the turntable cam member 50. The turntable cam member 50 is arranged so that the upper side becomes the back side of the mechanical pencil 1 in FIG. 7. The turntable cam member 50 is a member formed in a cylindrical shape, and has a gripping portion 50a located in the center in the axial direction, a small diameter portion 50b having a smaller diameter than the gripping portion 50a, and a small diameter portion 50b formed on the rear of the gripping portion 50a. The flange portion 50c in front of the small diameter portion 50b, the two fitting protrusions 50d formed on the rear end surface of the flange portion 50c, and the turntable cam 51 formed on the rear end surface of the small diameter portion 50b. Two fitting The protrusion 50d is symmetrically arranged around the center axis. The front of the grip portion 50a is formed with a small diameter, and two locking protrusions 50e extending forward from the grip portion 50a are formed symmetrically around the center axis.
轉盤凸輪51，是具有：以在圓環狀的端面沿著周向升起的方式被設置的傾斜狀或螺旋狀這樣的第1斜面51a、以及在第1斜面51a的出發點(低位置)與最終點(高位置)之間被設在軸線方向的第1段差51b。亦即，第1段差51b被作成連接第1斜面51a的出發點與最終點的構造。The turntable cam 51 has a first inclined surface 51a, such as an inclined or spiral shape, which is provided so as to rise in the circumferential direction on an annular end surface, and a starting point (low position) and a final point of the first inclined surface 51a. There is a first step 51b in the axial direction between (high position). That is, the first step 51b is made into a structure that connects the starting point and the final point of the first inclined surface 51a.
圖8為有軌凸輪構件60的立體圖，圖9為有軌凸輪構件60的其他的立體圖。有軌凸輪構件60在圖8被配置成上方成為自動鉛筆1之後側。有軌凸輪構件60為被形成環狀的構件。在有軌凸輪構件60的前端面，是在中心軸線周圍對稱形成有2個調整凹部60a。調整凹部60a的各個，是由沿著周向等間隔並列的同一深度之凹陷的6個第1嵌合凹部60b、以及較第1嵌合凹部60b更淺之凹陷的1個第2嵌合凹部60c。FIG. 8 is a perspective view of the railed cam member 60, and FIG. 9 is another perspective view of the railed cam member 60. As shown in FIG. The rail cam member 60 is arranged so that the upper side becomes the back side of the mechanical pencil 1 in FIG. 8. The rail cam member 60 is a member formed into a ring shape. On the front end surface of the rail cam member 60, two adjustment recesses 60a are symmetrically formed around the center axis. Each of the adjusting recesses 60a is composed of six first fitting recesses 60b of the same depth arranged at equal intervals along the circumferential direction, and one second fitting recess that is shallower than the first fitting recess 60b 60c.
在有軌凸輪構件60的後端面形成有軌凸輪61。有軌凸輪61，是具有：以在圓環狀的端面沿著周向升起的方式被設置的傾斜狀或螺旋狀這樣的環狀凸輪面之第2斜面61a、以及在第2斜面61a的出發點(低位置)與最終點(高位置)之間被設在軸線方向的第2段差61b。亦即，第2段差61b被作成連接第2斜面61a的出發點與最終點的構造。有軌凸輪61的第2斜面61a較轉盤凸輪51的第1斜面51a更陡。有軌凸輪61的第2段差61b的高度比轉盤凸輪51的第1段差51b的高度更高。A rail cam 61 is formed on the rear end surface of the rail cam member 60. The rail cam 61 has a second inclined surface 61a of an annular cam surface such as a slanted or spiral shape that is provided so as to rise in the circumferential direction on an annular end surface, and a starting point on the second inclined surface 61a ( A second step 61b in the axial direction is provided between the low position) and the final point (high position). That is, the second step 61b is made into a structure that connects the starting point and the final point of the second inclined surface 61a. The second slope 61 a of the rail cam 61 is steeper than the first slope 51 a of the turntable cam 51. The height of the second step 61 b of the rail cam 61 is higher than the height of the first step 51 b of the turntable cam 51.
圖10為被組合的轉盤凸輪構件50及有軌凸輪構件60的立體圖，圖11為被組合的轉盤凸輪構件50及有軌凸輪構件60的其他的立體圖。轉盤凸輪構件50及有軌凸輪構件60在圖10及圖11被配置成上方成為自動鉛筆1之後側。環狀的有軌凸輪構件60被插入轉盤凸輪構件50的小徑部50b的後端部，藉由凸緣部50c被卡止而被組合。亦即，有軌凸輪構件60之前端面抵接在轉盤凸輪構件50的凸緣部50c之後端面。更詳細的是，被設在轉盤凸輪構件50的凸緣部50c的嵌合突起50d的各個嵌合在有軌凸輪構件60的調整凹部60a的任一個第1嵌合凹部60b或第2嵌合凹部60c。因此，有軌凸輪構件60被配置在轉盤凸輪構件50的徑向外側。在圖10，嵌合突起50d嵌合在和第2嵌合凹部60c相鄰的第1嵌合凹部60b。又在圖11，嵌合突起50d嵌合在第2嵌合凹部60c。10 is a perspective view of the turntable cam member 50 and the rail cam member 60 that are combined, and FIG. 11 is another perspective view of the turntable cam member 50 and the rail cam member 60 that are combined. The turntable cam member 50 and the rail cam member 60 are arranged so that the upper side becomes the back side of the mechanical pencil 1 in FIGS. 10 and 11. The ring-shaped rail cam member 60 is inserted into the rear end portion of the small diameter portion 50b of the turntable cam member 50, and is assembled by being locked by the flange portion 50c. That is, the front end surface of the rail cam member 60 abuts against the rear end surface of the flange portion 50 c of the turntable cam member 50. In more detail, each of the fitting protrusions 50d provided on the flange portion 50c of the turntable cam member 50 is fitted into either the first fitting recess 60b or the second fitting of the adjustment recess 60a of the rail cam member 60 Recess 60c. Therefore, the rail cam member 60 is arranged on the radially outer side of the turntable cam member 50. In FIG. 10, the fitting protrusion 50d is fitted in the 1st fitting recessed part 60b adjacent to the 2nd fitting recessed part 60c. In FIG. 11, the fitting protrusion 50d is fitted into the second fitting recess 60c.
在組合了轉盤凸輪構件50及有軌凸輪構件60的狀態下，轉盤凸輪構件50的轉盤凸輪51被配置在有軌凸輪構件60的有軌凸輪61之附近。藉此，轉盤凸輪51及有軌凸輪61合作在周向構成連續的，亦即構成環狀的進給凸輪面70。In a state where the turntable cam member 50 and the rail cam member 60 are combined, the turntable cam 51 of the turntable cam member 50 is arranged in the vicinity of the rail cam 61 of the rail cam member 60. Thereby, the turntable cam 51 and the rail cam 61 cooperate to form a continuous circumferential direction, that is, a ring-shaped feeding cam surface 70 is formed.
如圖2所示，轉盤凸輪構件50及有軌凸輪構件60被組合的狀態下，被配置在滑件9的前端部9a及中間部9b的外側。轉盤凸輪構件50的一部分及有軌凸輪構件60，是藉由筆頭構件4覆蓋外周面。在筆頭構件4的前端部內面與轉盤凸輪構件50的凸緣部50c之間配置有線圈彈簧72。又，由於凸輪抵接彈簧18將滑件9朝前方彈推，所以，滑件9的抵接件9c對進給凸輪面70維持抵接的狀態。轉盤凸輪構件50及有軌凸輪構件60，是藉由有軌凸輪構件60的後端面與前軸2的前端面抵接而限制朝後方的移動。又，有軌凸輪構件60的外周面與筆頭構件4的內周面卡合而限制對有軌凸輪構件60的筆頭構件4甚至對軸筒6的旋轉。As shown in FIG. 2, in a state where the turntable cam member 50 and the rail cam member 60 are combined, they are arranged outside the front end portion 9a and the middle portion 9b of the slider 9. A part of the turntable cam member 50 and the rail cam member 60 are covered with the pen tip member 4 on the outer peripheral surface. A coil spring 72 is arranged between the inner surface of the tip portion of the pen head member 4 and the flange portion 50 c of the turntable cam member 50. In addition, since the cam abutment spring 18 urges the slider 9 forward, the abutment 9c of the slider 9 maintains a state in which the feed cam surface 70 is in contact with each other. The turntable cam member 50 and the rail cam member 60 restrict the rearward movement when the rear end surface of the rail cam member 60 abuts against the front end surface of the front shaft 2. In addition, the outer peripheral surface of the railed cam member 60 engages with the inner peripheral surface of the tip member 4 to restrict the rotation of the tip member 4 of the railed cam member 60 and even the barrel 6.
進給凸輪面70的形狀，是藉由讓轉盤凸輪構件50及有軌凸輪構件60繞中心軸線相對旋轉，可作變更。亦即，使用者用一方的手握著軸筒6，且邊用另一方的手握住從軸筒6的前端突出的轉盤凸輪構件50的把持部50a，使轉盤凸輪構件50相對於軸筒6繞中心軸線旋轉。有軌凸輪構件60由於對軸筒6卡合，所以，轉盤凸輪構件50相對於有軌凸輪構件60繞中心軸線旋轉。The shape of the feeding cam surface 70 can be changed by relatively rotating the turntable cam member 50 and the rail cam member 60 around the central axis. That is, the user holds the shaft barrel 6 with one hand, and while holding the grip portion 50a of the turntable cam member 50 protruding from the front end of the shaft barrel 6 with the other hand, makes the turntable cam member 50 relative to the shaft barrel 6 6 Rotate around the central axis. Since the rail cam member 60 is engaged with the shaft tube 6, the turntable cam member 50 rotates about the central axis relative to the rail cam member 60.
對有軌凸輪構件60的轉盤凸輪構件50的旋轉，是逐步性地進行轉盤凸輪構件50的嵌合突起50d在對應的有軌凸輪構件60的相鄰的第1嵌合凹部60b或第2嵌合凹部60c間作移動並進行嵌合。因此，對有軌凸輪構件60的轉盤凸輪構件50繞中心軸線的旋轉，是在轉盤凸輪構件50的嵌合突起50d可移動的有軌凸輪構件60的調整凹部60a的範圍內逐步性地進行。對應轉盤凸輪構件50的嵌合突起50d嵌合的有軌凸輪構件60的第1嵌合凹部60b或第2嵌合凹部60c的位置，有軌凸輪構件60的有軌凸輪61與轉盤凸輪構件50的轉盤凸輪51相對位置作變化，其結果可變更進給凸輪面70的形狀。藉由線圈彈簧72轉盤凸輪構件50對有軌凸輪構件60被彈推，而在對有軌凸輪構件60的轉盤凸輪構件50的逐步性的旋轉時能獲得按壓感。關於進給凸輪面70的形狀的變更邊參照圖12及圖13邊進一步說明。The rotation of the turntable cam member 50 of the rail cam member 60 is performed step by step to insert the fitting protrusion 50d of the turntable cam member 50 into the adjacent first fitting recess 60b or the second fitting recess 60b or the second of the corresponding rail cam member 60. The engaging recesses 60c are moved and fitted. Therefore, the rotation of the turntable cam member 50 of the rail cam member 60 about the central axis is gradually performed within the range of the adjustment recess 60a of the rail cam member 60 in which the fitting protrusion 50d of the turntable cam member 50 is movable. Corresponding to the position of the first fitting recess 60b or the second fitting recess 60c of the rail cam member 60 into which the fitting protrusion 50d of the turntable cam member 50 is fitted, the rail cam 61 of the rail cam member 60 and the turntable cam member 50 The relative position of the turntable cam 51 is changed, and as a result, the shape of the feed cam surface 70 can be changed. The turntable cam member 50 is pushed against the rail cam member 60 by the coil spring 72, and a pressing feeling can be obtained when the turntable cam member 50 of the rail cam member 60 is rotated step by step. The change of the shape of the feed cam surface 70 will be further described with reference to FIGS. 12 and 13.
圖12表示圖10的進給凸輪面70之示意圖，圖13表示圖11的進給凸輪面70之示意圖。圖12及圖13，是為了表示轉盤凸輪構件50及有軌凸輪構件60的位置關係，而將包含進給凸輪面70的繞中心軸線的圓筒面朝周向展開者。在圖12及圖13，上方為自動鉛筆1之後側。FIG. 12 shows a schematic diagram of the feeding cam surface 70 of FIG. 10, and FIG. 13 shows a schematic diagram of the feeding cam surface 70 of FIG. 11. 12 and 13 show the positional relationship between the turntable cam member 50 and the rail cam member 60, and the cylindrical surface around the center axis including the feed cam surface 70 is expanded in the circumferential direction. In FIGS. 12 and 13, the upper side is the back side of the mechanical pencil 1.
若參照圖12，以轉盤凸輪51的第1斜面51a與有軌凸輪61的第2斜面61a在徑方向重疊被配置的方式，而將轉盤凸輪構件50對有軌凸輪構件60作定位。圖12中，位在轉盤凸輪51的第1斜面51a及有軌凸輪61的第2斜面61a中更後方，亦即，位在較圖中靠上方的連續的面構成進給凸輪面70。此外，在進給凸輪面70，將藉由轉盤凸輪51的第1斜面51a與有軌凸輪61的第2段差61b所形成的軸線方向的段差71(落差)之高度(高低差)設為段差高度H。Referring to FIG. 12, the first inclined surface 51 a of the turntable cam 51 and the second inclined surface 61 a of the rail cam 61 are arranged to overlap in the radial direction, and the turntable cam member 50 is positioned with respect to the rail cam member 60. In FIG. 12, the first inclined surface 51 a of the turntable cam 51 and the second inclined surface 61 a of the rail cam 61 are located farther back, that is, a continuous surface located higher than the figure constitutes the feed cam surface 70. In addition, on the feed cam surface 70, the height (height difference) of the level difference 71 (level difference) in the axial direction formed by the first inclined surface 51a of the turntable cam 51 and the second level difference 61b of the rail cam 61 is the level difference Height H.
若參照圖13，與圖12所示的進給凸輪面70比較，使有軌凸輪61的第2斜面61a相對於轉盤凸輪51的第1斜面51a位在更後方的方式，將轉盤凸輪構件50對有軌凸輪構件60作定位。亦即，在圖13如上述，嵌合突起50d嵌合在和第1嵌合凹部60b相比為淺的凹陷的第2嵌合凹部60c。因此，有軌凸輪61相對於轉盤凸輪51被配置在更後方。另一方面，嵌合突起50d在作成同一深度的凹陷的6個第1嵌合凹部60b間作移動時，有軌凸輪61相對於轉盤凸輪51在軸線方向位於同一位置。13, compared with the feed cam surface 70 shown in FIG. 12, the turntable cam member 50 is positioned in a manner that the second inclined surface 61a of the rail cam 61 is positioned further rearward with respect to the first inclined surface 51a of the turntable cam 51 The rail cam member 60 is positioned. That is, as described above in FIG. 13, the fitting protrusion 50 d is fitted into the second fitting recess 60 c which is a shallower recess than the first fitting recess 60 b. Therefore, the rail cam 61 is arranged further behind the turntable cam 51. On the other hand, when the fitting protrusion 50d moves between the six first fitting recesses 60b formed as recesses of the same depth, the rail cam 61 is located at the same position in the axial direction with respect to the turntable cam 51.
若著眼在段差高度H，則嵌合突起50d在調整凹部60a嵌合在從第2嵌合凹部60c最遠的第1嵌合凹部60b時，段差高度H為最小。嵌合突起50d若嵌合在比第2嵌合凹部60c近的第1嵌合凹部60b，則依照轉盤凸輪51的第1斜面51a的傾斜段差高度H成比例變大。亦即，嵌合突起50d在相鄰的第1嵌合凹部60b間移動時，段差高度H的變化量為一定。嵌合突起50d從嵌合在和第2嵌合凹部60c相鄰的第1嵌合凹部60b的圖10所示的狀態，移動到和第2嵌合凹部60c嵌合的圖11所示的狀態時，段差高度H的變化量成為最大。Focusing on the step height H, when the fitting protrusion 50d is fitted in the adjustment recess 60a in the first fitting recess 60b furthest from the second fitting recess 60c, the step height H is the smallest. When the fitting protrusion 50d is fitted in the first fitting recess 60b that is closer to the second fitting recess 60c, the height H of the inclination step of the first inclined surface 51a of the turntable cam 51 becomes larger in proportion. That is, when the fitting protrusion 50d moves between the adjacent first fitting recesses 60b, the amount of change in the step height H is constant. The fitting protrusion 50d moves from the state shown in FIG. 10 where it is fitted in the first fitting recess 60b adjacent to the second fitting recess 60c to the state shown in FIG. 11 where it is fitted in the second fitting recess 60c. At this time, the amount of change in the step height H becomes the largest.
旋轉驅動機構30的轉子40，是根據筆芯7的緩衝動作將滑件9慢慢地旋轉驅動。亦即，以滑件9的前端部9a在前進行觀看時，滑件9繞中心軸線向右旋轉。藉由該旋轉運動，滑件9的抵接件9c與進給凸輪面70邊合作邊朝周向移動。亦即，滑件9的抵接件9c，是以沿著構成進給凸輪面70的轉盤凸輪51的第1斜面51a或有軌凸輪61的第2斜面61a爬升的方式作移動。此時，滑件9慢慢地後退。The rotor 40 of the rotation driving mechanism 30 slowly rotates and drives the slider 9 according to the buffering action of the pen core 7. That is, when the front end portion 9a of the slider 9 is viewed in front, the slider 9 rotates to the right about the central axis. With this rotational movement, the abutting piece 9c of the slider 9 and the feed cam surface 70 move in the circumferential direction while cooperating. That is, the contact 9c of the slider 9 moves so as to climb along the first inclined surface 51a of the turntable cam 51 or the second inclined surface 61a of the rail cam 61 constituting the feed cam surface 70. At this time, the slider 9 slowly retreats.
抵接件9c到達段差71時，藉由凸輪抵接彈簧18的彈推力被按壓，而落入段差71。亦即，滑件9僅段差71的段差高度H量從有軌凸輪61的第2斜面61a朝更前方移動。此時，由於被配置在滑件9的內部的保持夾頭10也同樣朝前方移動，所以，被保持夾頭10所保持的筆芯7從滾珠夾頭11被引出，而相對從前端管8僅段差高度H量被不斷送出。因此，被不斷送出的筆芯7的量，亦即被不斷送出的量與段差高度H相等。When the abutting piece 9c reaches the step 71, it is pressed by the elastic force of the cam abutting spring 18, and falls into the step 71. That is, the slider 9 moves forward from the second inclined surface 61 a of the rail cam 61 by only the level difference height H of the level difference 71. At this time, since the holding chuck 10 arranged inside the slider 9 also moves forward in the same manner, the pen core 7 held by the holding chuck 10 is drawn out from the ball chuck 11 and relatively from the tip tube 8. Only the step height H is continuously sent out. Therefore, the amount of the pen core 7 that is continuously sent out, that is, the amount that is continuously sent out, is equal to the step height H.
藉由以上的動作，抵接件9c沿著進給凸輪面70每繞一周可將筆芯7從前端管8不斷送出。藉由重複此動作，筆芯7隨著書寫動作邊磨耗，邊依序不斷送出筆芯7。Through the above actions, the abutting member 9c can continuously send out the pen core 7 from the front end tube 8 every time the abutting member 9c makes one revolution along the feeding cam surface 70. By repeating this action, the pen core 7 is continuously sent out in sequence while being worn out with the writing action.
也就是說在芯送出的機構，抵接件9c依照轉子40的旋轉沿著進給凸輪面70移動，藉由抵接件9c落入進給凸輪面70之段差71時的滑件9的前進動作，構成藉由滾珠夾頭11引出被保持夾頭10所保持的筆芯7。藉由芯送出的機構利用進給凸輪面70之段差71，可將旋轉驅動機構30中的轉子40的旋轉驅動力轉換成筆芯7不斷送出的動作。所謂「落差」總稱為在進給凸輪面70形成高低差的構造。That is to say, in the core sending mechanism, the abutment 9c moves along the feed cam surface 70 in accordance with the rotation of the rotor 40, and the slider 9 moves forward when the abutment 9c falls into the step 71 of the feed cam surface 70 The action constitutes the lead 7 held by the holding chuck 10 by the ball chuck 11. The core delivery mechanism utilizes the step 71 of the feed cam surface 70 to convert the rotational driving force of the rotor 40 in the rotation drive mechanism 30 into the continuous delivery action of the pen core 7. The so-called “drop” is generally referred to as a structure in which a height difference is formed on the feed cam surface 70.
又，自動鉛筆1構成承受旋轉驅動機構30中的轉子40的旋轉驅動力，使被滾珠夾頭11所保持的筆芯7也被旋轉驅動。因此，可防止持續書寫的過程中的筆芯7的偏摩耗的情形，其結果，可防止描繪線的粗細或描繪線的濃淡大幅變化的情況。也就是說旋轉驅動機構30具有轉子40，且是承受被滾珠夾頭11所把持之筆芯7所承受的書寫壓所致的軸線方向之後退動作及由書寫壓的解除所致的軸線方向之前進動作，將轉子40朝一方向作旋轉驅動。In addition, the mechanical pencil 1 is configured to receive the rotational driving force of the rotor 40 in the rotational driving mechanism 30, so that the pen core 7 held by the ball chuck 11 is also rotationally driven. Therefore, it is possible to prevent partial abrasion of the pen core 7 during continuous writing, and as a result, it is possible to prevent the thickness of the drawing line or the shade of the drawing line from greatly changing. That is to say, the rotary drive mechanism 30 has a rotor 40, and it bears the axial retreat action caused by the writing pressure of the pen core 7 held by the ball chuck 11 and the axial direction caused by the release of the writing pressure. The forward motion drives the rotor 40 to rotate in one direction.
又，在送出量調整機構，是如上述藉由讓轉盤凸輪構件50及有軌凸輪構件60單純繞中心軸線相對旋轉，可變更進給凸輪面70中的段差71的段差高度H。因此，可更簡便且正確地進行芯送出的機構所致的筆芯7的不斷送出的量的調整。In addition, in the delivery amount adjustment mechanism, the step height H of the step 71 in the feed cam surface 70 can be changed by simply rotating the turntable cam member 50 and the rail cam member 60 relative to each other around the center axis as described above. Therefore, it is possible to more simply and accurately perform the adjustment of the continuous feeding amount of the pen core 7 by the core feeding mechanism.
只要將不同使用者所致的不同書寫壓、所利用的筆芯7硬度等的不同所致的筆芯7的磨耗的程度、與筆芯7不斷送出的量調整到幾乎一致，則不管書寫動作如何，可將來自前端管8的筆芯7的突出量經常保持在一定。其結果，在自動鉛筆1，是一次的按壓操作就可長時間持續的書寫。以形成具有相當於超過通常所設想之筆芯7的磨耗程度的長度的段差高度H之段差71的方式構成轉盤凸輪51為理想。因而成為可設定成依照全部的使用者的喜好進行筆芯7的不斷送出的量。As long as the degree of wear of the pen core 7 caused by the different writing pressures caused by different users, the hardness of the pen core 7 used, etc. is adjusted to almost the same as the amount of continuous delivery of the pen core 7, no matter the writing action However, the amount of protrusion of the refill 7 from the tip tube 8 can always be kept constant. As a result, the mechanical pencil 1 can continue writing for a long time with one pressing operation. It is desirable to configure the turntable cam 51 to form a level difference 71 having a level difference height H corresponding to a length exceeding the abrasion level of the pen core 7 normally assumed. Therefore, it becomes an amount that can be set so that the refill 7 is continuously sent out according to the preferences of all users.
尤其，藉由調整凹部60a具有較第1嵌合凹部60b更淺的凹陷的第2嵌合凹部60c，在轉盤凸輪構件50及有軌凸輪構件60的相對性的預定的旋轉位置，和其他的旋轉位置相比可讓轉盤凸輪構件50及有軌凸輪構件60在軸線方向隔開。換言之，轉盤凸輪構件50具有嵌合突起，有軌凸輪構件60具有嵌合突起與可嵌合的複數條嵌合凹部，複數個嵌合凹部的1個在上述預定的旋轉位置，構成讓轉盤凸輪構件50及有軌凸輪構件60在軸線方向分開。其結果，可將段差71的段差高度H不是按比例而是進行極端的調整，可讓不斷送出的量極端地增加。例如用更強的書寫壓進行書寫時，筆芯7的磨耗量比起通常的書寫壓更大，這樣的情況，藉由將不斷送出的量極端地增加，形成一次的按壓操作可進行長時間持續的書寫。In particular, by adjusting the second fitting recess 60c, which has a shallower recess than the first fitting recess 60b, in the adjustment recess 60a, the relative predetermined rotational position of the turntable cam member 50 and the rail cam member 60 can be adjusted to other positions. Compared with the rotation position, the turntable cam member 50 and the rail cam member 60 can be spaced apart in the axial direction. In other words, the turntable cam member 50 has a fitting protrusion, and the railed cam member 60 has a fitting protrusion and a plurality of fitting recesses that can be fitted. One of the plurality of fitting recesses is at the above-mentioned predetermined rotation position to form a turntable cam. The member 50 and the rail cam member 60 are separated in the axial direction. As a result, the level difference height H of the level difference 71 can be adjusted to an extreme rather than proportionally, and the amount of continuous delivery can be extremely increased. For example, when writing with a stronger writing pressure, the abrasion of the pen core 7 is greater than that of the normal writing pressure. In this case, by extremely increasing the amount of continuous delivery, a single pressing operation can be performed for a long time. Continuous writing.
在上述的實施形態，雖然轉盤凸輪構件50作為第1凸輪構件為圓筒狀的構件，可是也可為環狀的構件。又，雖然有軌凸輪構件60作為第2凸輪構件為環狀的構件，可是也可為圓筒狀的構件。在第1凸輪構件設置有軌凸輪61，在第2凸輪構件也可設轉盤凸輪51。亦即，環狀或筒狀的第1凸輪構件與被配置在第1凸輪構件的徑向外側的環狀或筒狀的第2凸輪構件合作構成進給凸輪面亦可。又，藉由讓第1凸輪構件及第2凸輪構件相對前後移動，亦即藉由在軸線方向分開，也可調整段差的段差高度。In the above-mentioned embodiment, although the turntable cam member 50 is a cylindrical member as the first cam member, it may be an annular member. In addition, although the railed cam member 60 is an annular member as the second cam member, it may be a cylindrical member. A rail cam 61 is provided in the first cam member, and a turntable cam 51 may be provided in the second cam member. That is, the ring-shaped or cylindrical first cam member and the ring-shaped or cylindrical second cam member arranged on the radially outer side of the first cam member may cooperate to form a feed cam surface. Furthermore, by moving the first cam member and the second cam member relatively back and forth, that is, by separating them in the axial direction, the step height of the step can also be adjusted.
然而，一般書寫動作，是將自動鉛筆相對於書寫面從垂直的狀態傾斜的狀態下來進行。在具備旋轉驅動機構的自動鉛筆，書寫壓所致的軸線方向之後退動作，是藉由傾斜後的狀態的自動鉛筆對書寫面垂直被施加的書寫壓所致的力的軸線方向之分力來進行。相對於書寫壓所致的力的軸線方向之垂直方向的分力讓對軸筒相對進行的旋轉構件的旋轉時的阻抗增加。亦即，旋轉構件的外面雖藉由構成軸筒的一部分之例如與筆頭構件滑動接觸，支撐旋轉驅動機構所致的旋轉構件的旋轉，可是，上述的垂直方向的分力使滑動抵抗，亦即使摩擦抵抗增加。若摩擦抵抗大，則特別是書寫壓小的使用者會有不能讓旋轉驅動機構旋轉的顧慮。尤其若旋轉構件的外徑大，則摩擦抵抗所致的力的扭矩也變大。However, a general writing operation is performed by tilting the mechanical pencil from a vertical state with respect to the writing surface. In a mechanical pencil with a rotary drive mechanism, the axial retreat movement caused by the writing pressure is determined by the axial component of the force caused by the writing pressure applied perpendicularly to the writing surface of the mechanical pencil in the inclined state. get on. The component force in the vertical direction with respect to the axial direction of the force caused by the writing pressure increases the resistance during the rotation of the rotating member relative to the barrel. That is, although the outer surface of the rotating member constitutes a part of the shaft barrel, for example, it is in sliding contact with the pen tip member to support the rotation of the rotating member caused by the rotation drive mechanism, but the above-mentioned vertical component force resists the sliding movement. Friction resistance increases. If the frictional resistance is large, users who have a small writing pressure may not be able to rotate the rotary drive mechanism. In particular, if the outer diameter of the rotating member is large, the torque of the force due to frictional resistance also becomes large.
根據本發明的實施形態所致的自動鉛筆1，可讓旋轉驅動機構所致的旋轉構件的旋轉時的摩擦抵抗減低。針對這個邊參照圖14邊進行說明。According to the mechanical pencil 1 according to the embodiment of the present invention, the friction resistance during the rotation of the rotating member caused by the rotating drive mechanism can be reduced. This side will be described with reference to FIG. 14.
圖14為圖1的自動鉛筆1的前端部的放大剖視圖。在自動鉛筆1，是邊參照圖2邊如上述，凸輪抵接彈簧18的後端相對於中繼構件12的凸緣部12a被安裝，凸輪抵接彈簧18的前端被安裝在滑件9的後端部之內壁。又，連結於轉子40的中繼構件12雖將旋轉驅動機構30中的轉子40的旋轉驅動力對把持筆芯7的狀態的滾珠夾頭11作傳達，可是對於滑件9不會直接傳達。亦即，滑件9雖被配置在中繼構件12的前端部之外側，可是對於中繼構件12沒有直接被連結。另外，從旋轉驅動機構30中的轉子40往滑件9的旋轉驅動力的傳達，是經由凸輪抵接彈簧18來進行。詳細是凸輪抵接彈簧18藉由將滑件9朝前方彈推，而作用讓抵接件9c抵接在凸輪面發揮功能的同時，也作為扭力彈簧(扭轉彈簧)發揮功能。Fig. 14 is an enlarged cross-sectional view of the front end of the mechanical pencil 1 of Fig. 1. In the mechanical pencil 1, referring to FIG. 2 as described above, the rear end of the cam abutment spring 18 is attached to the flange portion 12a of the relay member 12, and the front end of the cam abutment spring 18 is attached to the slider 9 The inner wall of the rear end. In addition, although the relay member 12 connected to the rotor 40 transmits the rotational driving force of the rotor 40 in the rotational drive mechanism 30 to the ball chuck 11 holding the pen core 7, it does not directly transmit it to the slider 9. That is, although the slider 9 is arranged on the outer side of the front end portion of the relay member 12, it is not directly connected to the relay member 12. In addition, the transmission of the rotational drive force from the rotor 40 in the rotational drive mechanism 30 to the slider 9 is performed via the cam abutment spring 18. In detail, the cam abutment spring 18 acts to make the abutment 9c abut on the cam surface by urging the slider 9 forward, and it also functions as a torsion spring (torsion spring).
因此，在自動鉛筆1，滑件9、筆芯7及滾珠夾頭11再者被安裝在滑件9的前端管8承受旋轉驅動機構30中的轉子40的旋轉驅動力而旋轉。因此，包含前端管8的該等構件構成對軸筒6進行旋轉的旋轉構件。旋轉構件的旋轉在圖14的C部，前端管8藉由與軸筒6，具體而言藉由與轉盤凸輪構件50滑動接觸而被支撐。前端管8的外徑因為比筆芯7的外徑更僅稍微大的程度，所以和旋轉構件的其他的構件相比非常地細。因此，摩擦抵抗所致的力的扭矩變更小。又，可縮小前端管8的外面與轉盤凸輪構件50的內面的接觸面積，可使旋轉驅動機構30所致的旋轉構件的旋轉時的摩擦抵抗更減低。其結果，即便是書寫壓小的使用者，在自動鉛筆1可讓旋轉驅動機構30旋轉。Therefore, in the mechanical pencil 1, the slider 9, the pen core 7, and the ball chuck 11 are further mounted on the tip tube 8 of the slider 9 to receive the rotation driving force of the rotor 40 in the rotation driving mechanism 30 to rotate. Therefore, these members including the tip tube 8 constitute a rotating member that rotates the shaft cylinder 6. The rotation of the rotating member is in the part C of FIG. 14, and the tip tube 8 is supported by sliding contact with the shaft cylinder 6, specifically, by sliding contact with the turntable cam member 50. Since the outer diameter of the tip tube 8 is only slightly larger than the outer diameter of the refill 7, it is very thin compared to other members of the rotating member. Therefore, the torque change of the force due to frictional resistance is small. In addition, the contact area between the outer surface of the tip tube 8 and the inner surface of the turntable cam member 50 can be reduced, and the frictional resistance during the rotation of the rotating member by the rotation drive mechanism 30 can be further reduced. As a result, even for a user with a low writing pressure, the mechanical pencil 1 can rotate the rotation drive mechanism 30.
前端管8為金屬製的圓筒構件為理想。另一方面，軸筒6側的構件，亦即轉盤凸輪構件50為ABS、聚碳酸酯等的硬質塑膠製的構件。因此，比起硬質塑膠製的軸筒及硬質塑膠製的旋轉構件滑動接觸的情況，硬質塑膠製的軸筒及金屬製的圓筒構件滑動接觸的情況更摩擦抵抗少。其結果，根據自動鉛筆1，可讓旋轉驅動機構30所致的旋轉構件的旋轉時的摩擦抵抗更減低。The tip tube 8 is preferably a cylindrical member made of metal. On the other hand, the member on the barrel 6 side, that is, the turntable cam member 50 is a member made of hard plastic such as ABS or polycarbonate. Therefore, compared to the case where the shaft tube made of hard plastic and the rotating member made of hard plastic slide in contact, the case where the shaft tube made of hard plastic makes sliding contact with the cylindrical member made of metal has less friction resistance. As a result, according to the mechanical pencil 1, the frictional resistance during the rotation of the rotating member by the rotation drive mechanism 30 can be further reduced.
金屬製的前端管8由於是藉由拉伸加工所製造，所以尺寸精度也佳。例如為樹脂製的成形零件時，相對於尺寸公差為±0.02mm，在金屬製的零件時，可將尺寸公差設為±0.01m。因此，可進一步縮小前端管8與轉盤凸輪構件50之間的間距，可讓旋轉構件的旋轉時的晃動減低。Since the metal tip tube 8 is manufactured by drawing processing, the dimensional accuracy is also good. For example, in the case of resin molded parts, the relative dimensional tolerance is ±0.02mm, and in the case of metal parts, the dimensional tolerance can be set to ±0.01m. Therefore, the distance between the tip tube 8 and the turntable cam member 50 can be further reduced, and the shaking of the rotating member during rotation can be reduced.
此外，只要能在金屬製的圓筒構件進行軸筒與旋轉構件的滑動接觸，可隨意構成圓筒構件。例如，不是將金屬製的圓筒構件配置在前端管8，而是配置在前端管附近的滑件9的外面，例如配置在前端部9a的外面亦可。又，不是將金屬製的圓筒構件配置在旋轉構件側，而是配置在與軸筒側的旋轉構件滑動接觸的部分，例如配置在轉盤凸輪構件50的內面。In addition, as long as sliding contact between the shaft tube and the rotating member can be performed on the metal cylindrical member, the cylindrical member can be configured as desired. For example, instead of arranging a metal cylindrical member on the tip tube 8, it may be arranged on the outer surface of the slider 9 near the tip tube, for example, it may be arranged on the outer surface of the tip portion 9a. In addition, the metal cylindrical member is not arranged on the side of the rotating member, but is arranged in a portion that is in sliding contact with the rotating member on the side of the shaft cylinder, for example, on the inner surface of the turntable cam member 50.
亦即，本發明的實施形態的自動鉛筆1，是具備設在軸筒及旋轉構件的一方的金屬製的圓筒構件，藉由旋轉構件承受轉子的旋轉驅動力而進行旋轉，構成被滾珠夾頭所把持的筆芯旋轉，藉由軸筒及旋轉構件的另一方在圓筒構件的表面進行滑動接觸，支撐旋轉驅動機構所致的旋轉構件的旋轉。That is, the mechanical pencil 1 of the embodiment of the present invention is provided with a metal cylindrical member provided on one of the shaft barrel and the rotating member, and the rotating member receives the rotational driving force of the rotor to rotate, thereby forming a ball clamp The refill held by the head rotates, and the other of the shaft barrel and the rotating member makes sliding contact on the surface of the cylindrical member to support the rotation of the rotating member caused by the rotating drive mechanism.
然而，一般來按壓蓋在橡皮擦的使用時被取下。又，在筆芯補充的時候，從按壓構件取下按壓蓋及橡皮擦。按壓蓋為非常小的零件，從按壓構件取下時會有從手滑落而遺失按壓蓋的可能性。又，按壓蓋即便被放置在桌上等，由於一般具有圓筒狀的外形，所以從桌上等滾落，會有按壓蓋遺失的可能性。However, in general, the pressing cover is removed when the eraser is in use. Also, when refilling the refill, remove the pressing cover and the eraser from the pressing member. The pressing cover is a very small part, and when it is removed from the pressing member, the pressing cover may slip from the hand and lose the pressing cover. In addition, even if the pressing cover is placed on a table or the like, since it generally has a cylindrical shape, it rolls off from the table and the like, and the pressing cover may be lost.
根據本發明的實施形態的自動鉛筆1，可防止按壓蓋的遺失。針對這個邊參照圖15至圖17邊進行說明。According to the mechanical pencil 1 of the embodiment of the present invention, the loss of the pressing cover can be prevented. This side will be described with reference to FIGS. 15 to 17.
圖15為按壓蓋23的立體圖，圖16為將按壓蓋23安裝在自動鉛筆1後端部的狀態的立體圖，圖17為將按壓蓋23安裝在自動鉛筆1的前端部的狀態的立體圖。15 is a perspective view of the pressing cover 23, FIG. 16 is a perspective view of a state where the pressing cover 23 is attached to the rear end of the mechanical pencil 1, and FIG. 17 is a perspective view of a state where the pressing cover 23 is attached to the front end of the mechanical pencil 1.
在按壓蓋23形成有開口端23a。藉由將按壓棒20的後端部插入開口端23a內，按壓蓋23對按壓棒20的外周面可嵌合。按壓蓋23的開口端23a，亦即在開口端面2個缺口部23b繞中心軸線形成對稱。在按壓蓋23，在與開口端23a相反側的被封閉之端部形成有貫穿孔23c(圖3)。藉由形成有貫穿孔23c，即便幼兒等誤飲按壓蓋23也不會阻塞氣管可確保安全性。The pressing cover 23 is formed with an open end 23a. By inserting the rear end of the pressing rod 20 into the opening end 23 a, the pressing cover 23 can be fitted to the outer peripheral surface of the pressing rod 20. The open end 23a of the pressing cover 23, that is, the two notches 23b on the open end surface are symmetrical around the central axis. In the pressing cover 23, a through hole 23c is formed at the closed end on the side opposite to the opening end 23a (FIG. 3). Since the through hole 23c is formed, even if an infant or the like accidentally drinks the press cover 23, the trachea will not be blocked, and safety can be ensured.
如圖7及圖16所示，在作為軸筒6的前端部之轉盤凸輪構件50設有2個卡止突起50e。按壓蓋23可和軸筒6的前端部嵌合。亦即，藉由將按壓蓋23的缺口部23b嵌合在軸筒6的卡止突起50e嵌合，按壓蓋23可裝卸地嵌合在軸筒6的前端部。As shown in FIGS. 7 and 16, the turntable cam member 50 serving as the front end of the shaft cylinder 6 is provided with two locking protrusions 50 e. The pressing cover 23 can be fitted with the front end of the barrel 6. That is, by fitting the notch portion 23b of the pressing cover 23 to the locking protrusion 50e of the shaft cylinder 6, the pressing cover 23 is detachably fitted to the front end of the shaft cylinder 6.
也就是說按壓蓋23也可嵌合在軸筒6的前端部及後端部。因此，書寫時，是藉由將按壓蓋23嵌合軸筒6的後端部能防止按壓蓋23的遺失。另一方面，在保管時或收容時等的非書寫時或筆芯的補充時等藉由將按壓蓋23嵌合在軸筒6的前端部能防止按壓蓋23的遺失。In other words, the pressing cover 23 may be fitted to the front end and the rear end of the shaft cylinder 6. Therefore, when writing, by fitting the pressing cover 23 to the rear end portion of the barrel 6, it is possible to prevent the pressing cover 23 from being lost. On the other hand, the pressing cover 23 can be prevented from being lost by fitting the pressing cover 23 to the tip portion of the barrel 6 during non-writing during storage or storage, or during refill refilling.
尤其，在具有送出量調整機構的自動鉛筆1，藉由把持嵌合在轉盤凸輪構件50的按壓蓋23，對於軸筒6可將轉盤凸輪構件50更容易旋轉。亦即，藉由將按壓蓋23嵌合，使轉盤凸輪構件50的把持部50a的軸線方向的長度實質性地變長，由於更容易把持，而更容易施加旋轉力。In particular, in the mechanical pencil 1 having a feeding amount adjustment mechanism, by gripping the pressing cover 23 fitted to the turntable cam member 50, the turntable cam member 50 can be rotated more easily with respect to the shaft cylinder 6. That is, by fitting the pressing cover 23, the axial length of the gripping portion 50a of the turntable cam member 50 is substantially increased, and since it is easier to grip, it is easier to apply a rotational force.
此外，按壓蓋23，是在自動鉛筆不具有轉盤凸輪構件時，只要可嵌合在軸筒的前端部，也可嵌合在任意構件，例如可嵌合在筆頭構件。亦即，按壓蓋23可嵌合在軸筒的後端部，且只要可嵌合在軸筒的前端部，也可嵌合在任意的構件。又，在上述的實施形態，雖對2個缺口部嵌合2個卡止突起，也可構成以其他的數量或形狀做嵌合。In addition, when the mechanical pencil does not have a dial cam member, the pressing cover 23 may be fitted to any member as long as it can be fitted to the front end of the barrel. For example, it can be fitted to a pen tip member. That is, the pressing cover 23 can be fitted to the rear end of the shaft tube, and can be fitted to any member as long as it can be fitted to the front end of the shaft tube. In addition, in the above-mentioned embodiment, although the two locking protrusions are fitted to the two notches, it may be configured to be fitted with other numbers or shapes.
然而，保持夾頭的材料一般為丁腈橡膠等的橡膠材料。因此，保持夾頭因長年而蠕變變形，會有保持力下降的情況。又，筆芯例如為0.5mm的表示直徑的產品時，在0.55mm至0.58mm的範圍會有尺寸的不均。因此，藉由橡膠成形時的尺寸的不均，與筆芯的尺寸的不均的關係，也會有保持力變強或變弱的情況。However, the material for holding the chuck is generally a rubber material such as nitrile rubber. Therefore, the holding chuck will creep and deform over the years, and the holding force may decrease. In addition, when the pen core is a product with a diameter of 0.5 mm, for example, there will be dimensional unevenness in the range of 0.55 mm to 0.58 mm. Therefore, due to the uneven size of the rubber during molding, the holding force may become stronger or weaker in relation to the uneven size of the refill.
根據本發明的實施形態的自動鉛筆1，可減少長年所致的保持力的下降，且提高尺寸精度。針對這個邊參照圖18至圖22邊進行說明。According to the mechanical pencil 1 of the embodiment of the present invention, it is possible to reduce the decrease in the holding force caused over the years, and to improve the dimensional accuracy. This side will be described with reference to FIGS. 18 to 22.
圖18為第1保持夾頭80的立體圖，圖19為第2保持夾頭90的立體圖，圖20為保持夾頭10的立體圖。保持夾頭10具有第1保持夾頭80與第2保持夾頭90。FIG. 18 is a perspective view of the first holding chuck 80, FIG. 19 is a perspective view of the second holding chuck 90, and FIG. 20 is a perspective view of the holding chuck 10. The holding chuck 10 has a first holding chuck 80 and a second holding chuck 90.
第1保持夾頭80為金屬製的板狀構件，藉由衝壓加工被成形。第1保持夾頭80具有大致矩形的矩形板部81、與第1保持部82。第1保持部82，是由作為從矩形板部81的各長邊的中央部延伸的2個板狀構件的板狀部83形成。板狀部83的各個，是從矩形板部81的長邊以互相接近的方式彎曲延伸，在彎曲部84以互相遠離的方式朝相反向彎曲延伸。在矩形板部81的中心形成作為圓形的貫穿孔的第1插入孔85。矩形板部81的短邊形成圓弧狀。如後述，筆芯7可藉由第1保持部82保持。The first holding chuck 80 is a plate-shaped member made of metal and is formed by press working. The first holding chuck 80 has a substantially rectangular rectangular plate portion 81 and a first holding portion 82. The first holding portion 82 is formed of a plate-shaped portion 83 that is two plate-shaped members extending from the center portion of each long side of the rectangular plate portion 81. Each of the plate-shaped portions 83 is bent and extended from the long sides of the rectangular plate portion 81 so as to be close to each other, and bends and extends in opposite directions at the bent portion 84 so as to be away from each other. A first insertion hole 85 that is a circular through hole is formed in the center of the rectangular plate portion 81. The short sides of the rectangular plate portion 81 are formed in an arc shape. As described later, the pen core 7 can be held by the first holding portion 82.
第2保持夾頭90為非金屬製，例如橡膠製或樹脂製的圓板狀構件。第2保持夾頭90具有：圓板部91、沿著圓板部91的一方的面之外周緣而設的周壁92、以及在圓板部91的中心畫成第2插入孔93，且從圓板部91突出的第2保持部94。第2保持部94具有圓錐梯形的外形。因此，第2保持部94具有錐狀的外周面，在變細的前端的開口可保持筆芯7。The second holding chuck 90 is a disc-shaped member made of non-metal, for example, rubber or resin. The second holding chuck 90 has: a disc portion 91, a peripheral wall 92 provided along the outer periphery of one surface of the disc portion 91, and a second insertion hole 93 drawn in the center of the disc portion 91, and The second holding portion 94 from which the disc portion 91 protrudes. The second holding portion 94 has a conical trapezoidal outer shape. Therefore, the second holding portion 94 has a tapered outer peripheral surface, and the pen core 7 can be held at the opening at the tapered tip.
此外，第2保持夾頭90的第2保持部94所致的筆芯7的保持力被設定的比第1保持夾頭80的第1保持部82所致的筆芯7的保持力更小。In addition, the holding force of the pen core 7 by the second holding portion 94 of the second holding chuck 90 is set to be smaller than the holding force of the pen core 7 by the first holding portion 82 of the first holding chuck 80 .
若參照圖20，第1保持夾頭80對第2保持夾頭90被安裝。具體而言，金屬製的第1保持夾頭80的矩形板部81的短邊的各個對第2保持夾頭90的周壁92作卡合。此時，第2保持夾頭90的第2保持部94被插入第1保持夾頭80的第1插入孔85內。Referring to FIG. 20, the first holding chuck 80 is attached to the second holding chuck 90. Specifically, each of the short sides of the rectangular plate portion 81 of the first holding chuck 80 made of metal is engaged with the peripheral wall 92 of the second holding chuck 90. At this time, the second holding portion 94 of the second holding chuck 90 is inserted into the first insertion hole 85 of the first holding chuck 80.
圖21為說明保持夾頭10的動作的圖。圖21(A)表示將筆芯7放入芯盒19後緊接著的狀態。此時，滾珠夾頭11仍沒有把持筆芯7。若在此狀態進行按壓操作，則筆芯7因重力而前進，滾珠夾頭11把持筆芯7(圖21(B))。再者若進行按壓操作，筆芯7前進被插入第2保持夾頭90的第2插入孔93內，藉由第2保持部94被保持。因此，即便解除按壓操作所致的按壓，筆芯7沒有後退而藉由第2保持夾頭90被保持(圖21(C))。FIG. 21 is a diagram explaining the operation of the holding chuck 10. FIG. 21(A) shows the state immediately after the refill 7 is placed in the core case 19. At this time, the ball chuck 11 still does not hold the pen core 7. If the pressing operation is performed in this state, the refill 7 will advance due to gravity, and the ball chuck 11 will hold the refill 7 (FIG. 21(B)). Furthermore, when the pressing operation is performed, the pen core 7 is advanced and inserted into the second insertion hole 93 of the second holding chuck 90, and is held by the second holding portion 94. Therefore, even if the pressing by the pressing operation is released, the pen core 7 does not move back but is held by the second holding chuck 90 (FIG. 21(C) ).
再者若進行按壓操作，則滾珠夾頭11邊把持筆芯7邊前進，筆芯7藉由第1保持夾頭80的第1保持部82被保持(圖21(D))。具體而言，藉由筆芯7前進而被插入第1保持部82的2個板狀部83間。此時筆芯7藉由第1保持部82的彈性變形，具體而言藉由使2個板狀部83彈性變形而被挾持。同時，筆芯7也藉由第2保持夾頭90的第2保持部94被保持。接著，若解除按壓操作所致的按壓，則藉由第1保持夾頭80及第2保持夾頭90保持著筆芯7的狀態下，僅滾珠夾頭11後退。接著，藉由反覆進行按壓操作，可與上述的滾珠夾頭11的前後動連動將筆芯7按預定量依序不斷送出。Furthermore, if the pressing operation is performed, the ball chuck 11 moves forward while holding the refill 7, and the refill 7 is held by the first holding portion 82 of the first holding chuck 80 (FIG. 21(D)). Specifically, as the pen core 7 advances, it is inserted between the two plate-shaped portions 83 of the first holding portion 82. At this time, the pen core 7 is held by the elastic deformation of the first holding portion 82, specifically, by elastically deforming the two plate-shaped portions 83. At the same time, the pen core 7 is also held by the second holding portion 94 of the second holding chuck 90. Next, when the pressing by the pressing operation is released, the first holding chuck 80 and the second holding chuck 90 hold the pen core 7 and only the ball chuck 11 retreats. Then, by repeatedly performing the pressing operation, the refill 7 can be continuously sent out in order by a predetermined amount in conjunction with the forward and backward movement of the ball chuck 11 described above.
也就是說，自動鉛筆1作為保持夾頭10為具有金屬製的第1保持部82的第1保持夾頭80，藉由第1保持部82的彈性變形保持筆芯7，藉此可保持筆芯7。藉由將第1保持夾頭80作為金屬製，與以往的保持夾頭比較，長年所致的保持力的下降少，且可實現尺寸精度高的保持夾頭。That is, the mechanical pencil 1 as the holding chuck 10 is the first holding chuck 80 having the first holding portion 82 made of metal, and the pen core 7 is held by the elastic deformation of the first holding portion 82, whereby the pen can be held Core 7. By making the first holding chuck 80 made of metal, compared with the conventional holding chuck, the reduction in holding force over the years is less, and a holding chuck with high dimensional accuracy can be realized.
上述的實施形態，在軸筒6內雖將第1保持夾頭80與第2保持夾頭90一體作配置，可是將第1保持夾頭80與第2保持夾頭90分開進行配置。又，上述的實施形態，在軸筒6內雖將第2保持夾頭90配置在第1保持夾頭80的後方，可是也可將第2保持夾頭90一體或分開配置在第1保持夾頭80的前方。In the above-mentioned embodiment, although the first holding chuck 80 and the second holding chuck 90 are integrally arranged in the shaft cylinder 6, the first holding chuck 80 and the second holding chuck 90 are separately arranged. In the above-mentioned embodiment, although the second holding chuck 90 is arranged behind the first holding chuck 80 in the shaft cylinder 6, the second holding chuck 90 may be integrated or separately arranged in the first holding chuck. The front of the head 80.
如上述，第2保持夾頭90的第2保持部94所致的筆芯7的保持力被設定的比第1保持夾頭80的第1保持部82所致的筆芯7的保持力更小。因此，第2保持夾頭90發揮輔助第1保持夾頭80的輔助保持夾頭的作用。在軸筒6內，除了第1保持夾頭80之外藉由配置第2保持夾頭90，可更確實保持筆芯7。第2保持夾頭90的筆芯7的保持力也可比以往的保持夾頭的保持力更低。As described above, the holding force of the pen core 7 by the second holding portion 94 of the second holding chuck 90 is set to be greater than the holding force of the pen core 7 by the first holding portion 82 of the first holding chuck 80 small. Therefore, the second holding chuck 90 functions as an auxiliary holding chuck that assists the first holding chuck 80. In the barrel 6, by arranging the second holding chuck 90 in addition to the first holding chuck 80, the pen core 7 can be more surely held. The holding force of the pen core 7 of the second holding chuck 90 can also be lower than that of the conventional holding chuck.
此外，在上述的實施形態，保持夾頭10雖具有第1保持夾頭80與第2保持夾頭90，可是保持夾頭10也可僅具有第1保持夾頭80。一邊參照圖22一邊針對保持夾頭10僅具有第1保持夾頭80的情況進行說明。In addition, although the holding chuck 10 has the first holding chuck 80 and the second holding chuck 90 in the above-mentioned embodiment, the holding chuck 10 may have only the first holding chuck 80. The case where the holding chuck 10 has only the first holding chuck 80 will be described with reference to FIG. 22.
圖22為說明第1保持夾頭80的動作的圖。圖22(A)表示將筆芯7放入芯盒19進行按壓操作的狀態。筆芯7通過第1插入孔85被配置在第1保持部82的正前方。若在此狀態進一步進行按壓操作，則筆芯7前進藉由第1保持部82被保持(圖22(B))。接著，藉由反覆進行按壓操作，可與上述的滾珠夾頭11的前後動連動將筆芯7按預定量依序不斷送出。FIG. 22 is a diagram illustrating the operation of the first holding chuck 80. FIG. 22(A) shows a state where the refill 7 is placed in the core case 19 and the pressing operation is performed. The pen core 7 is arranged directly in front of the first holding portion 82 through the first insertion hole 85. If the pressing operation is further performed in this state, the refill 7 advances and is held by the first holding portion 82 (FIG. 22(B)). Then, by repeatedly performing the pressing operation, the refill 7 can be continuously sent out in order by a predetermined amount in conjunction with the forward and backward movement of the ball chuck 11 described above.
在本發明的實施形態的自動鉛筆1，藉由保持夾頭10具有具備金屬製的第1保持部82的第1保持夾頭80，而比起以往的橡膠材料製的保持夾頭，長年所致的保持力的下降少，且可獲得尺寸精度高的保持夾頭。再者，藉由與筆芯7抵接的第1保持部82的部分，亦即藉由彎曲部84形成彎曲形狀，不會有傷害筆芯7的情況。In the mechanical pencil 1 of the embodiment of the present invention, since the holding chuck 10 has the first holding chuck 80 provided with the first holding portion 82 made of metal, compared with the conventional holding chuck made of rubber material, it has been reduced for many years. The resulting holding force is reduced less, and a holding chuck with high dimensional accuracy can be obtained. Furthermore, the portion of the first holding portion 82 that abuts the pen core 7, that is, the curved portion 84 is formed into a curved shape, so that the pen core 7 will not be damaged.
此外，具有金屬製的第1保持部的第1保持夾頭，藉由第1保持部的彈性變形保持筆芯，藉此只要可保持筆芯，可任意構成第1保持夾頭。例如，在上述的實施形態，第1保持部雖由2個板狀構件形成，亦可由3個以上的板狀構件形成。又，不是將第1保持部作成板狀構件，也可由可夾持筆芯7的棒狀構件構成。In addition, the first holding chuck having the first holding portion made of metal holds the pen core by the elastic deformation of the first holding portion, so that the first holding chuck can be arbitrarily configured as long as the pen core can be held. For example, in the above-mentioned embodiment, although the first holding portion is formed of two plate-shaped members, it may be formed of three or more plate-shaped members. In addition, instead of forming the first holding portion as a plate-shaped member, it may be constituted by a rod-shaped member that can hold the pen core 7.
