200810947 九、發明說明： 【發明所屬之技術領域】 【先前技術】 本發明是關於-種削芯器，特別是指一種專門甩來畜 切鉛筆之筆芯的具有削筆芯功能之削芯器。 早期錯筆在設計上，通常係將一根桿狀的筆芯包覆名200810947 IX. Description of the invention: [Technical field to which the invention pertains] [Prior Art] The present invention relates to a type of core cutter, and more particularly to a core cutter having a refill function for refilling a pencil refill . In the early days, the wrong pen was usually designed with a rod-shaped refill
…木i外设巾，當筆芯長m或者書寫端鈍化時，^ ^ ^ ^ m ^ ^ ^ ^ ^ ,ρ ^ ^ 0f ^ ^ ^ ^ ^ ^ 寫端’惟由於此種以冰製外殼包覆筆芯的設計，在削切^ =時需要連同外殼一起创除，因此在使用上不太方便，1 疋市面上出現一種只需削切筆芯的筆具。 而習知專門用來削切筆芯的削怒器1的構造大致如圖 、2所示，即該削芯器! 一般是安裝在一筆具2的上方，戶片 述筆具2包含-筆桿21、一個安裝在筆桿21頂端的筆夹 22、-個螺裝在筆桿21下方的筆頭23，以及一支裝在筆桿 21内且底部突出筆頭23的筆芯24，該筆夹22具有一個往 上突出的套合部221。 而該削芯器1包含-刀座1Γ、—個固韻安裝在刀座 11上的刀片12 ’以及一個可拔離地安裝在刀座1〗上的端蓋 13，該刀座11具有一個水平的基壁lu、一個由該基壁m 外周緣往下延伸並套設在筆夾22之套合部221上的套合環 壁112，以及一環自基壁U1往上突出的刀片安裝壁ιΐ3， 其中套合垓壁112的内徑必需和套合部221及筆頭23的外 徑相配合，所述基壁1U具有一個位於中央的通孔114，而 200810947 口亥刀片12疋固疋地插裝在刀片安裝壁ιΐ3間，具有一個開 及一斜削面123所構成。 , ^^ 1 w 2 ^ 22 ^^^ 221 i 24 ，乃將削芯器1拔離筆夹22再反向設置，使刀[n的套合 112 f ^ 23. t 24 T7>t 11...wood i peripheral towel, when the refill length m or the writing end is passivated, ^ ^ ^ ^ m ^ ^ ^ ^ ^ , ρ ^ ^ 0f ^ ^ ^ ^ ^ ^ Write end 'only because of this ice shell The design of the coated refill needs to be created together with the outer casing when cutting ^ =, so it is not convenient to use. On the market, there is a writing instrument that only needs to cut the refill. The structure of the sharpener 1 which is specially used for cutting the refill is roughly as shown in Fig. 2, that is, the core cutter! Generally mounted on the top of the pen 2, the pen 2 includes a pen 21. A pen holder 22 mounted on the top end of the pen holder 21, a pen head 23 screwed under the pen holder 21, and a refill 24 mounted in the pen holder 21 and projecting the pen tip 23 at the bottom, the pen holder 22 having a The protruding portion 221 is protruded. The core cutter 1 comprises a blade holder 1 , a blade 12 ′ mounted on the blade holder 11 and an end cover 13 detachably mounted on the blade holder 1 , the blade holder 11 having a a horizontal base wall lu, a collar ring wall 112 extending downward from the outer periphery of the base wall m and sleeved on the sleeve portion 221 of the clip 22, and a blade mounting wall projecting upward from the base wall U1 ΐ 3, wherein the inner diameter of the sleeve wall 112 must match the outer diameter of the sleeve portion 221 and the pen tip 23, the base wall 1U has a centrally located through hole 114, and the 200810947 mouth blade 12 is fixed. It is inserted between the blade mounting walls ι 3 and has an opening and a beveled surface 123. , ^^ 1 w 2 ^ 22 ^^^ 221 i 24 , is to pull the core cutter 1 off the pen holder 22 and then reverse the setting, so that the knife [n fit 112 f ^ 23. t 24 T7> t 11
II4伸入刀片I2之缺口⑵時，藉由轉動削芯器丄以及筆 具2的其中之一，就可以利用刀片12的斜削面123來削 筆芯24 〇 一般筆具2在使甩時，最理想之書寫長度是筆芯μ突 出於筆頭23的長度為6.5麵，且突出部份的5養被削切成 底部縮東的尖錐狀。而習知削芯旨1位在圖2假想線所示 的未使用狀態時，該刀座U之套合環壁112是框套在筆夾 的套口 σρ 221上’虽削芯器2位在圖2實線所示的使用 狀態時’該刀座11之套合環壁112是框套在筆頭23外，而 筆芯24的底部也會由通孔114進入刀片12之缺口 'η。然 而在套入的過裎中可以發現，當筆芯Μ突出於筆頭23之 長度不足6.5腦時，受到套合環壁112的限制，該^ 的底緣無法往缺口 U1的底部伸入，因此無論如何轉動筆 具2，都無法將鈍化的筆芯24底部削切成縮束的尖錐狀。 反之’當筆芯24突出長度大於6.5職時，雖然筆过％的底 部可以伸到缺口 121的底緣，但是在削切的過程中，筆頭 23並無法受到套合環壁112的護持，因此容易產生旋轉偏 200810947 差、削切角度偏斜等缺失。 【發明内容】 本發明之目的係在提供—種在_時可以全程定位筆 =並可削切出最佳形狀及突出長度之具有削筆功能的When the II4 protrudes into the notch (2) of the blade I2, by rotating one of the core cutter 丄 and the writing instrument 2, the beveled surface 123 of the blade 12 can be used to cut the refill 24, and when the general writing instrument 2 is used, The most ideal writing length is that the refill μ protrudes from the length of the pen tip 23 by 6.5 faces, and the 5 portions of the protruding portion are cut into a tapered shape which is bent at the bottom. However, when the conventional core is used in the unused state shown in the imaginary line of FIG. 2, the sleeve ring wall 112 of the holder U is sleeved on the sleeve σρ 221 of the clip, although the core is 2 In the state of use shown by the solid line in Fig. 2, the sleeve ring wall 112 of the holder 11 is sleeved outside the tip 23, and the bottom of the cartridge 24 is also passed through the through hole 114 into the notch 'n of the blade 12. However, it can be found in the inserted shackles that when the length of the stylus protrudes beyond the length of the pen tip 23 is less than 6.5 brain, it is restricted by the collar ring wall 112, and the bottom edge of the hole cannot protrude into the bottom of the notch U1. Regardless of how the writing instrument 2 is rotated, the bottom of the passivated refill 24 cannot be cut into a constricted tapered shape. Conversely, when the refill 24 has a protruding length greater than 6.5, although the bottom of the pen can extend to the bottom edge of the notch 121, the pen 23 cannot be protected by the collar wall 112 during the cutting process. It is easy to produce a loss of rotation, such as 200810947 difference, and cutting angle deviation. SUMMARY OF THE INVENTION The object of the present invention is to provide a pen-cutting function that can be used to locate a pen at all times and can cut out the best shape and protruding length.
削芯器。 V 本發明之削芯器係可削切一筆具的一筆芯，所述筆具 還具有-個鄰近筆芯的筆頭，該削芯器包含：—刀座單元Core cutter. V The core cutter of the present invention is capable of cutting a core of a pen set, the pen having a pen tip adjacent to the refill, the core cutter comprising: a knife seat unit
^ ^ ^a ^ ^ ^ ^ ^ # ^ ^ ^ ^ ^ ^ 削槽的刀座，以及至少一具有一往削槽伸入之刃部的刀片 ，而該護持單元包括—供筆具之筆頭插設的護持座、一使 護持座具復位力的彈性件，α及一將護持座及彈性件安裝 在刀座上的安裝筒座’該護持座之—護持通道並與削槽直 線對應。 當削芯器位在一非削切位置時，該護持座與刀座相間 隔，而當筆具之筆頭插設定位在護持座之護持通道，且筆 芯朝刀座之削槽時，下壓筆具的力量會使得護挤座逐漸地 克服彈性件之彈办往刀座移近，最後讓削芯器轉換到一削 切位置。 而本發明由非削切位置轉換到削切位置的過程中，該 筆具的筆頭會全程地受到護持座所護持，同時逐漸伸入削 槽之筆芯因為在護持座與刀座間形成兩點護持，而能不偏 擺地受到刀片的削切，因此本發明可以削切出最佳突出長 度及形狀之筆芯。 【實施方式】 200810947 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之較佳實施例的詳細說明中，將可清楚 的呈現。 參朋圖3、4,本發明削芯器之第一較佳實施例係可用 來削切一筆具3之一筆芯3卜所述筆具31還具有一個筆頭 3^，而該筆芯31具有一個位在下方的書寫端Η】，當書寫 端311因為書寫而逐漸鈍化時，利用本發明該削芯器的削切 _ 可以恢復尖銳狀。而本實施例的削芯器包含·· 一刀座單元4 、一防塵套5，以及一護持單元6。 該刀座單元4包括：一個圓筒狀之刀座41、兩片可更 換地女衣在刀座41上的刀片42、一用來固定該等刀片42 的刀片固定座43，以及一個可拆離地安裝在刀座41下方的 端蓋44，其中該刀座41具有一個水平的環基壁411、一環 由λ裒基土 411之徑向外端往端蓋44方向延伸的座壁 個由％基壁411之挺向内端往上突出的刀片架壁413、 _ 個位在°亥刀片架壁413間的削槽414，以及一値位在座壁 412間並與削槽414相通的容屬室m，該座壁々η具有一 衣彳二向大出且鄰近下方的靠抵環々Μ，以及一環位在靠抵環 416 M 413 418交集且斜向設置的，人式導槽4i9,以及—環鄰近上方 的第二環溝41〇。 而’亥等刀片42即由外往内插設在刀座41之彼入式導 槽419内，每個刀片42都具有—個往削槽椒突入的刀部 200810947 ^ 421，該等刃部421係由頂端逐漸地往下並往中央斜伸。而 該刀片固定座43是一個中空多角形的套體，具有一個戴面 與刀座41之刀片架壁413配合的圍繞壁431，以及一個供 忒刀片架壁413伸出的穿套孔432，藉該刀片固定座仏的 穿套，使刀片42以可更換方式安裝在刀座41 土。而該端 蓋44是可拆解地安裝在刀座41底部，具有_個水平的蓋 壁441、一環由蓋壁441外周緣往上突出的外環壁·、以 癱 及了環由蓋壁441往上突伸入容屑室415内的内環壁443， 在该外環壁442具有一由内環面突出並嵌卡在刀座41之第 - 一環溝417上的突卡環444。 本實施例之防塵套5是安裝在刀座41的上方，包括一 個圓形之插入壁51，以及一環由插入壁51之外周緣往下延 伸且截面與刀片架壁413配合的結合壁52，其中該插入壁 51具有數條徑向設置且中央連接的剖溝511，以及數個介於 兩兩相鄰剖溝511間的封閉片512，而該結合壁52具有一 %自内環面突出並嵌卡在刀座41之第二環溝41〇上的突卡 環 521。 本實施例之護持單元6包括：一穿套在刀片固定座43 外周緣的彈性件6卜一架設在該彈性件61上方的護持座 以及個穿套在刀座41外周緣並組裝該護持座的 ’筒座63。该安裝筒座μ具有一個可拆解地插套在刀座 41上的筒壁631，以及數個鄰近上方並由筒壁631之一内 衣面往中央突出的架靠條632，每個架靠條632的下方都具 個尺平的罪抵面633，而該護持座62具有一個可穿入 200810947 4等架罪條632間的護持壁621、一環位於護持壁621底端 並牷向犬出的靠抵壁622 ’以及一個由該護持壁621的一護 持面623界定而成的護持通道624，上述護挤面623係由^ 往削槽414方向逐漸地傾斜縮束，具有一個位在下方的定 位面625，而該靠抵壁622係可靠設在安裝筒座之該等 靠抵面633的下方，該彈性件61則是頂撐在刀座七^基 壁4U與靠抵壁622間，藉此讓護持座Q具有復位彈力。土 本發明之削芯器位在圖4所示的一非削切位置時，受 到彈性件6丨_撐’該護持座62是往上靠設在該等架靠 條632之靠抵緣633下方，亦即，該護持座62和刀座41 上下間隔一段距離。 、/參閱圖3、5、6’當使用者要執行削筆芯31的操作時 首先將筆具3的筆頭32插向護持座62之護持通道624， 625 〇 3 ^塵套5之封閉片512 ’並往削槽414伸入。當使用者克服 彈性件61的彈力下厭答目Q > ㈣力下堡筆具3,而使得筆芯31的書寫端3ΐι ^罪在刀片42的刀部421上時，轉動該筆具3可以進行削 切筆芯31_。而在進行削切的過程中，逐 粉I會落到容屑室415内，而筆芯31上鈍化的書寫端州 , 62 5 , 整個削切的操作即已完成。 特別加以祝明的是，本實施例為了削切出最佳形狀及 突^長度的筆芯31，該等刀片42交叉點到刀片42頂緣間 的同度L1以5咖為佳，而刀片42頂緣到護持座62之定位 10 200810947 ® ^625 L2 U 1.5 , m ^ 刀筆:31日守，只要使筆芯31突出的長度大於或等於6·5 mm 在削切過私中，因為筆芯31在刀座41舆護持座W間形 肖!〇転中’该筆芯31完全在兩個元件穩固的護持下逐漸完 、筆1的削太作業，故筆具3不僅可以獲得穩固的護持 _；Γ切動作完成‘該筆芯^㈣ φ ^ ^ 6,5 mm ? 5 mm - 设計不僅構造新穎，更具有削切時可以穩定護持筆具、，以 及削切出最佳突出長度及形狀等功效。 此外’本實施例在削切筆芯31的過程中，筆芯31的 ^會掉落到刀座41的容屬室415内，當筆具3拔錐^ =，邊谷削室415的頂端受到防塵座5所封閉，底端則 44, ^ 415> ^ =出内相筆芯4 ’只要將端蓋Μ拔離刀座〇，即可輕鬆 __ # ^ ® 7 ^ ^ ^ ^ ^ ^ f t ^ ： 刀座單元4、——防塵座5 及嗜技二二 社 留_ 以及一護持早70 6 ,其中該刀 座早兀4也是具有一個刀座 屮^ ϋ & 丛41兩片刀片42、一個安裝刀 下古刀片固疋座43，以及一個可拆離地安裝在刀座41 較佳實施例之…1是-體成型，而…^ 施例之刀座41係由—個方. ^貫 個/、有一削槽414的第二座體46相 200810947 卡嵌而成’藉該刀座41形狀及構造的改變，同樣可以連到 相同的功效。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 ^ 圖1是一種習知削芯器的立體分解圖； -圖2是該習知削芯器的一使用狀態 圖3是本發明削芯器之第一較佳實施例的立體分解獨 • ' ‘， 圖4疋该第一較佳實施例的一組合剖視圖，圖中該削 芯器位在一非削切位置； 圖5疋類似圖4的組合剖視圖，圖中該削芯器即將 進行削切一筆芯的動作； . 圖6疋類似圖4的組合剖視圖，圖中該削芯器已完 成削切筆芯的動作;及凡 。回疋本發明削芯器之第二較佳實施例的側視分解圖 12 200810947 '【主要元件符號說明】 3 筆具 442 外環壁 31 筆芯 443 内環壁 311 書寫端 444 突卡環 32 筆頭 45 第一座體 4 刀座單元 46 第二座體 41 刀座 5 防塵套 411 環基壁 51 插入壁 412 座壁 511 剖溝 413 刀片架壁 512 封閉片 414 削槽 52 結合壁 415 容屑室 521 突卡環 416 靠抵環 6 護持單元 417 第一環溝 61 彈性件 418 穿孔 62 護持座 419 嵌入式導槽 621 護持壁 410 第二環溝 622 靠抵壁 42 刀片 623 護持面 421 刃部 624 護持通道 43 刀片固定座 625 定位面 431 圍繞壁 63 安裝筒座 432 穿套孔 631 筒壁 44 端蓋 632 架靠條 441 蓋壁 63 3 罪抵面 13^ ^ ^a ^ ^ ^ ^ ^ # ^ ^ ^ ^ ^ ^ The slotted tool holder, and at least one blade having a blade portion that extends into the slot, and the holding unit includes - a pen holder for the writing instrument The retaining seat, an elastic member for restoring the retaining seat, and a mounting bracket for mounting the retaining seat and the elastic member on the seat, the retaining passage of the retaining seat and corresponding to the straight line of the cutting groove. When the core cutter is in a non-cutting position, the holder is spaced from the holder, and when the writing head of the writing instrument is inserted in the holding passage of the holder, and the refill is cut toward the holder, The force of the pen holder will cause the protector to gradually move toward the knife seat against the elastic member, and finally the core cutter is switched to a cutting position. In the process of converting the non-cutting position to the cutting position, the writing instrument of the writing instrument is fully protected by the protecting seat, and gradually extends into the refilling refill because two points are formed between the protective seat and the holder. The invention can be cut by the blade without yaw, so the invention can cut the refill with the best protruding length and shape. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to Figures 3 and 4, a first preferred embodiment of the core cutter of the present invention can be used to cut a pen 3 with a refill 3. The pen 31 also has a pen tip 3, and the refill 31 has A writing end positioned below, when the writing end 311 is gradually passivated due to writing, the sharpening of the core cutter using the present invention can be restored to a sharp shape. The core cutter of the embodiment includes a tool holder unit 4, a dust jacket 5, and a holding unit 6. The holder unit 4 includes: a cylindrical holder 41, two blades 42 of replaceable female garments on the holder 41, a blade holder 43 for fixing the blades 42, and a detachable An end cover 44 is mounted on the ground below the tool holder 41, wherein the holder 41 has a horizontal ring base wall 411, and a ring wall extending from the radially outer end of the λ base soil 411 toward the end cover 44 The base wall 411 of the base wall 411 protrudes upward toward the inner end, and the groove 414 between the block wall 413 and the space between the seat wall 412 and the slot 414 In the chamber m, the seat wall η has a placket in the two-way direction and is adjacent to the lower ring 々Μ, and a ring position is arranged obliquely at the ring 416 M 413 418, and the human guide groove 4i9 And the second ring groove 41〇 adjacent to the ring. The blade 42 such as the head is inserted into the guide groove 419 of the blade holder 41 from the outside to the inside, and each blade 42 has a blade portion 200810947^421 which is inserted into the grooved pepper. The 421 is gradually descended from the top and extends obliquely toward the center. The blade holder 43 is a hollow polygonal sleeve body having a surrounding wall 431 which is matched with the blade wall 413 of the blade holder 41, and a sleeve hole 432 for extending the blade wall 413. The blade 42 is mounted in the holder 41 in a replaceable manner by the insert of the blade holder. The end cover 44 is detachably mounted on the bottom of the seat 41, has a horizontal cover wall 441, an outer ring wall protruding upward from the outer periphery of the cover wall 441, and a ring wall The 441 protrudes upward into the inner ring wall 443 in the chip containing chamber 415. The outer ring wall 442 has a snap ring 444 which protrudes from the inner annular surface and is fitted to the first annular groove 417 of the holder 41. The boot 5 of the present embodiment is mounted above the blade holder 41 and includes a circular insertion wall 51, and a coupling wall 52 extending downward from the outer periphery of the insertion wall 51 and having a cross section that cooperates with the cartridge wall 413. The insertion wall 51 has a plurality of radially disposed and centrally connected dividing grooves 511, and a plurality of closing pieces 512 between the two adjacent dividing grooves 511, and the bonding wall 52 has a % from the inner annular surface. And the snap ring 521 is clamped on the second ring groove 41 of the seat 41. The holding unit 6 of the present embodiment includes: an elastic member 6 that is sleeved on the outer periphery of the blade holder 43; a holder that is disposed above the elastic member 61 and a sleeve that is sleeved on the outer circumference of the holder 41 and assembled with the holder 'Pipe holder 63. The mounting bracket μ has a cylindrical wall 631 that is detachably inserted into the seat 41, and a plurality of brackets 632 adjacent to the upper side and projecting from the underwear surface of the tubular wall 631 to the center, each of the brackets Each of the strips 632 has a flattened sinus 633, and the retaining seat 62 has a retaining wall 621 that can be inserted into the stalks 632 of 200810947 4, and a loop is located at the bottom end of the retaining wall 621 and is directed toward the dog. The abutting wall 622' and a retaining channel 624 defined by a retaining surface 623 of the retaining wall 621, the ablation surface 623 is gradually inclined downwardly from the direction of the cutting groove 414, and has a position below The positioning surface 625 is reliably disposed under the abutting surface 633 of the mounting cylinder seat, and the elastic member 61 is supported between the base 7U and the abutting wall 622. Thereby, the retaining seat Q has a reset elastic force. When the core cutter of the present invention is in a non-cutting position as shown in FIG. 4, the elastic member 6 is supported by the elastic member 6 ' 撑 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠 靠Below, that is, the holder 62 and the holder 41 are spaced apart from each other. Referring to Figures 3, 5, and 6', when the user wants to perform the operation of the refilling core 31, the pen tip 32 of the writing instrument 3 is first inserted into the holding channel 624 of the holder 62, and the closing piece of the 625 〇 3 ^ dust cover 5 512 'and extend into the slot 414. When the user overcomes the elastic force of the elastic member 61, the eyepiece Q> (4) forces the lower writing instrument 3, and when the writing end of the refill 31 is sinned on the blade portion 421 of the blade 42, the writing instrument 3 is rotated. It is possible to cut the refill 31_. In the process of cutting, the powder I will fall into the chip chamber 415, and the penetrating end of the refill 31, 62 5 , the entire cutting operation is completed. In particular, in order to cut out the best shape and length of the refill 31, the same degree L1 of the blade 42 crossing the top edge of the blade 42 is preferably 5 Å, and the blade is preferred. Positioning of the top edge of the 42 to the retaining seat 62 200810947 ® ^625 L2 U 1.5 , m ^ knives: 31 days, as long as the length of the refill 31 is greater than or equal to 6.5 mm in the cut, because the pen The core 31 is shaped between the holder 41 and the holder W. In the middle, the refill 31 is completely finished under the stable protection of the two components, and the pen 1 is cut too much, so that the writing instrument 3 can not only obtain a stable shape. Holding _; cutting action is completed 'The refill ^ (4) φ ^ ^ 6,5 mm ? 5 mm - The design not only has a novel structure, but also can stably hold the writing instrument when cutting, and cut the best protruding length And shape and other effects. In addition, in the process of cutting the refill 31 in the present embodiment, the refill 31 will fall into the housing chamber 415 of the holder 41, and when the writing instrument 3 is pulled out, the top of the side chamber 415 Closed by the dustproof seat 5, the bottom end is 44, ^ 415> ^ = the inner phase refill 4' can be easily removed by pulling the end cap away from the holder __ # ^ ® 7 ^ ^ ^ ^ ^ ^ Ft ^ : Knife unit 4, - dustproof seat 5 and whispering two _ _ _ and a protective early 70 6 , which is also a knife holder 屮 ^ ϋ &; 41 two blades 42. An installation blade lower blade solid holder 43, and a detachably mounted to the holder 41. The first embodiment is a body molding, and the workpiece holder 41 of the embodiment is composed of one side. The second seat 46 with a slot 414 is embedded in the 200810947. By the change of the shape and configuration of the seat 41, the same effect can be achieved. The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a conventional core cutter; FIG. 2 is a state of use of the conventional core cutter, FIG. 3 is a first preferred embodiment of the core cutter of the present invention. 3D, FIG. 4 is a combined cross-sectional view of the first preferred embodiment in which the core cutter is positioned in a non-cutting position; FIG. 5 is a combined sectional view similar to FIG. The core cutter is about to cut the action of a core; Fig. 6 is a sectional view similar to that of Fig. 4, in which the core cutter has completed the action of cutting the refill; A side view exploded view of a second preferred embodiment of the core cutter of the present invention. 200810947 '[Main component symbol description] 3 Pen 442 Outer ring wall 31 Refill 443 Inner ring wall 311 Writing end 444 Projection ring 32 Pen 45 first body 4 knife seat unit 46 second seat body 41 knife seat 5 dust jacket 411 ring base wall 51 insertion wall 412 seat wall 511 section groove 413 cartridge wall 512 closing piece 414 cutting groove 52 joint wall 415 chip Room 521 snap ring 416 abutment ring 6 retaining unit 417 first ring groove 61 elastic member 418 perforation 62 retaining seat 419 embedded guide groove 621 retaining wall 410 second annular groove 622 against wall 42 blade 623 retaining surface 421 blade 624 retaining channel 43 blade holder 625 positioning surface 431 around the wall 63 mounting the socket 432 through the hole 631 barrel wall 44 end cover 632 frame 441 cover wall 63 3 sin against the surface 13