201229350 六、發明說明： 【發明所屬之技術領域】 本發明係關於驅動縫紉機之馬達構造。 【先前技術】 作為驅動縫纟刀機之酿备 15動源’一般採用離合器馬達或 伺服馬達等之電動馬達。有 ^ 有關工業用縫紉機，以往的主 流是採用經由皮帶或齒於莖 ,▼次齒輪4將這些電動馬達連接（間接 連接）於縫幼機之主轴的方式，但會有摩擦損耗及噪音的 門題▲近年來’對於直接連接電動馬達與縫紉機之主軸 的所謂直接驅動方式之需求高漲(例如，I照文獻”。 文獻1中揭示有m主公知之包縫機上連接直接驅 動馬達(以下稱為直接式馬達)的例子。#由聯結器連接 從縫幼機機座突出之縫幼機主軸的-端及從馬達本體突 出之馬達軸H將馬達軸之驅動傳遞至縫幼機主轴 。馬達軸係可旋轉地被支撐於馬達本體上，通常是由一 對軸承所軸支。 於文獻1之揭不例中，直接式馬達係安裝成從縫紉機 側面長長地水平延伸’I有不靈活及佔空間的問題。為 了解決此問題’以往採用之省去了 —個軸承及聯結器之 直接式馬達的構造及其製造方法，亦已屬公知（例如，參 照文獻2)。 於文獻2之揭不例中，馬達軸係可旋轉地被懸臂式支 撐於馬達本體上，且馬遠本體之縫紉機安裝側被開口。 馬達轴通常是由軸承所轴支。其與文獻1之揭示例比較， 省去了聯結器及一個軸承（及安裝這些之馬達本體）的份 201229350 量可縮小在馬達安裝時之縫㉗機的寬度尺寸。 [先前技術文獻] [專利文獻] [專利文獻U中國新型專利第2_刪G772 8號公報 (尤其參照第3及第4圖） [專利文獻2]中國新型專利第2GG72()i92427」號公報 (尤其參照第1及第2圖） 【發明内容】 [發明所欲解決之課題] 直接式馬達係在縫幼機維護時或換裝於其他之縫匆 機上時等情形，會經常從縫㉟機上被拆下。若為文獻2 之直接式馬達的構造時，恐有灰塵等之異物從該馬達本 體的㈣機安裝部混人到馬達本體内部之虞。於馬達本 體之内部配置有由馬達線圈所構成之定子及由磁鐵所構201229350 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a motor configuration for driving a sewing machine. [Prior Art] As the drive of the slot machine, the "power source" is generally an electric motor such as a clutch motor or a servo motor. There are ^ related industrial sewing machines, the past mainstream is the use of belts or teeth on the stem, ▼ times gear 4 to connect these electric motors (indirectly connected) to the spindle of the sewing machine, but there will be friction loss and noise of the door In recent years, the demand for the so-called direct drive method for directly connecting the main shaft of the electric motor and the sewing machine has increased (for example, I.) The document 1 discloses that the direct drive motor is connected to the overlock sewing machine of the main master (hereinafter referred to as Example of a direct motor. #Connected by a coupling to the end of the slot machine shaft protruding from the slot machine base and the motor shaft H protruding from the motor body to transmit the drive of the motor shaft to the slot machine spindle. It is rotatably supported on the motor body, usually by a pair of bearings. In the disclosure of Document 1, the direct motor is mounted to extend horizontally from the side of the sewing machine. The problem of space. In order to solve this problem, the structure of the direct motor that used the bearing and the coupling and the manufacturing method thereof have been known (for example, Document 2) In the disclosure of Document 2, the motor shaft is rotatably supported by the motor body on the cantilever, and the sewing machine mounting side of the horse far body is opened. The motor shaft is usually supported by the bearing. Compared with the disclosure example of Document 1, the amount of 201229350 which eliminates the coupling and one bearing (and the motor body on which these are mounted) can reduce the width dimension of the slit machine when the motor is mounted. [Prior Art Document] [Patent Literature] [Patent Document U Chinese New Patent No. 2_Deleted G772 No. 8 (Special Reference to Figures 3 and 4) [Patent Document 2] Chinese New Patent No. 2GG72()i92427" (Special Reference to Figures 1 and 2) [Summary of the Invention] [Problems to be Solved by the Invention] The direct motor is often removed from the slot 35 when the sewing machine is being repaired or when it is replaced with another seaming machine. In the structure of the direct motor of Document 2, foreign matter such as dust may be mixed from the (4) machine mounting portion of the motor body to the inside of the motor body. A stator composed of a motor coil is disposed inside the motor body and Magnet structure
成的轉子，因異物之混人，會產生馬達破損或燒 題。 J 因此，本發明之課題，係以提供一種能達成縫劫機 安裝時之尺寸短小化、且自縫纺機上拆下時不會使灰塵 等之異物從外部混人到馬達本體之内部的直接式馬 為其目的。 [解決課題之手段] 申請專利範圍第1項之縫紉機的馬達構造，係具備： 馬達本體’其構成馬達之外殼且在縫紉機安裝側具有開 口，馬達轴’纟一端係自馬達本體突出，且在該—端侧 藉固定於馬達本體上之軸承以懸臂方式支撐成可旋轉， 201229350 並於另一端形成有接頭部. 定於馬達軸上；及定子， 具 於馬達本體内面，·該接頭部 ’該馬達構造之特徵為具有 達内之轉子及定子還靠近縫 本體之該開口。 轉子’其係於馬達内部被固 與該轉子對向地配置且固定 直接連接於縫紉機之主軸上 :封閉材，其係配置在比馬 切機安裝側，用以覆蓋馬達 申請專利範圍第2項之祕，μ 之縫紉機的馬達構造，係如申請 專利範圍第1項之發明，复转η+ /、将徵為該封閉材係具有：安裝 部，其固定於馬達本體上. 田Φ μ去红 本體，其形成為圓板狀， 用以覆羞馬達軸的周圍。 申請專利範圍第3項之縫紉機沾民、去冰* 哭、、刀機的馬達構造，係如申請 專利範圍第2項之發明，其料 ^ 丹将徵為.該馬達軸之接頭部， 係以不從馬達本體之該開口突出 _ 大®的方式作配置；且於接 頭部之外周形成有槽部；該封關 ^ 发对閉材之本體的前端配置於 s亥槽部。 [發明效杲] 根據本發明， 模造中，能達成縫 機上拆下馬達時不 部，從而可防止因 毁0 於直接連接於縫紉 紉機安裝時之尺寸 會使異物從外部混 為混入異物而引起 機之主軸上的馬達 短小化、且自縫紉 入到馬達本體之内 的馬達之破損或燒 【實施方式】 [用以實施發明之形態] 之第1實施形態 藉由支架9安裝 以下’參照第1至第3圖’針對本發明 進行說明。於縫紉機1之機座2的右側面， 201229350 有馬達8支架9係藉由螺检19而固定於機座，n有 ㈣於機座2上固定有軸承5,主㈣可旋轉地 破轴承5所支標。主軸4之_端係自機座心μ ^ 主軸4之該突出的-端嵌插有風扇12及軸環13。於主軸4 之-玄#上隔著墊圈14螺合有螺栓15。墊圈Μ之圓周緣 係抵接於轴環13的端部。藉由螺栓15對主車“之緊固，將 風扇1 2挾持於軸承5盥鮎捲；. 位置。 為13之間’以確定風扇12之左右 馬達8係具有形成馬達8之外殼的馬達本體18。馬達 本體18係形成為左右延伸之筒狀，且於馬達本體18之右 側壁固定有軸承23(軸承）’在與此右側壁對向之面即 馬達本體18之縫幼機安裝側係具有開口。於此馬達本體 18之開…凸緣部⑻形成突出狀。於凸緣部18c設有 左右貫穿之螺?L18b，18b。另外，於馬達本體以上部之凸 緣部18c附近設有將馬達本體18上下貫穿的通孔“a。 於馬達本體18内’馬達轴u呈水平地配置，馬達轴 1 1的軸部11 d係被支撐成可繞該軸承2 3旋轉。如第玉〜第3 圖所示，轴部Ud之-端係自馬達本體18突出，於該轴部 ud之突出端，利用螺栓7固定皮帶輪10。於軸部iid之另 女而側（縫幼機安裝側）設有接頭部丨丨a。軸部^ 1 d與接_ 部iu係處於同一軸心上。接頭部lla係形成為在：側頭 即縫幼機安裝側具有開口之中空圓筒形狀，接頭部" 之内徑係形成可供安裝於主軸4之軸環丨3以幾乎無a 的的方式嵌插之尺寸。另外，接頭部i丨a係以不從馬太 體18之縫紉機安裝側開口突出的方式作配置。2 :、 ’於接 201229350 頭部1 la上且能與馬達本體18之通孔18a同心的位置上設 有螺孔1 ib。由以上之構成，馬達軸丨丨成為被軸承23以懸 臂方式支撐的構造，與文獻2相同，可將馬達8已安裝於 縫幼機1上時的寬度尺寸短小化。於軸部u d的軸周圍固 定有由磁鐵構成之轉子21’轉子21係與馬達軸u—起旋 轉。另外，於馬達本體18之内面，以與轉子21對向配置 之方式固定有由馬達線圈構成的定子22。 馬達8係經由凸緣部18c之螺孔i8b，18b及支架”之 螺孔9a，9a而由螺栓20,2〇固定於支架9上。另外，於馬達 軸1 1之接頭部1 1 a上嵌合有固定了軸環丨3之主軸4。於軸 環1 3上且能與接頭部丨丨a之螺孔丨丨b同心的位置上設有螺 孔13a。於主軸4之該一端形成有接觸面钧。螺栓i6係經 由接頭部11a之螺孔llb及軸環13的螺孔na，以該螺栓 之前端抵接於該接觸面4a的方式，將接頭部Ua固定於主 軸4上《馬達軸丨丨係以與主軸4成為同一軸心之方式連接 固定於主軸4上。又，在馬達8被安裝於縫初機丨之狀態下 ，馬達本體18之通孔18a内螺合有螺栓17。當從通孔“a 中取下螺栓1 7，並從通孔i 8a中將螺絲刀等之工具插入鬲 達本體18之内部，旋鬆螺栓16時，可從主軸4上^ 頭 部 1 1 a。 ^ 本發明之特徵為，在如上述構成之縫幼機的馬達構 造中’將覆蓋馬達本體18之開口之封閉㈣配置於 達本體18内部之轉子21及定子22更靠近縫切機安裳側。 封閉材26係由形成為圓板狀而用以覆蓋馬達轴" 圍的本體26a、連結於該本體…之外周且自該外周水平 .201229350 延伸之安裝部26b、及安裝於安裝部26b之内周的補強構 件27所構成。本體26a與安裝部26b係以具有彈性之合成 橡膠等一體地形成’封閉材26係藉由將安裝部26b壓接於 馬達本體18之内面而被固定於馬達本體18上。補強構件 27係沿封閉材26之本體26a及安裝部26b形成截面呈‘‘L，， 字形，且用以保持本體263及安裝部261)之形狀的金屬製 品。如第2圖所示’本體26a的馬達軸1 1側中間部份折彎 成截面呈“〈”字形’其馬達軸丨丨側前端係接觸於環繞接 頭部1 1 a之外周形成之槽部i丨c的側面丨丨cb。另外，該本 體26a之馬達軸丨丨側前端，係以不接觸於槽部Uc之底面 1 lea的方式形成。 如前述’馬達軸11係成為被軸承2 3以懸臂方式支樓 ’所以，在缝紉機1之主軸4與馬達轴1.1的同一軸心發生 偏差而進行馬達8之安裝時，恐有馬達軸丨丨在接頭部【“ 偏心旋轉之虞。亦即，恐有接頭部Ua在垂直於軸向的方 向抖動地進行運動之虞，但若為上述實施形態，本體26a 不會自接頭部1 1 a接受該垂直方向之抖動所產生的負荷 可防止封閉材26之磨耗或破損。萬一本體26a與接頭部 U a接觸，因本體26a係以本體26a之彎曲部分作為支點進 行伸縮，所以仍可減輕因該接頭部丨la之抖動所承受到的 負荷》作為第2實施形態，如第4圖所示，亦可使本體26a 從其中間部分朝向馬達轴丨i侧的前端而朝皮帶輪側折彎 ，並使該本體26a之馬達轴11側前端接觸於環繞接頭部 Ha之開口端外周形成之槽部nc的側面Ucb。於第2實^ 形態中，亦以建構成使該本體26a之馬達軸丨丨側前端不接 -10- 201229350 叫 巧乃式較為適宜。 在如上述構成之縫匆機的馬達構造中，藉由將覆蓋 馬達本體8之開口的封閉材2 6配置於比馬達本體1 $内部 之轉子21及定子22更靠近縫幼機安裝#j，可防止在從縫 紉機1上拆下馬達8時’異物從馬達本體18之開口混入馬 達本體18之内部。因& ’可防止因異物混入馬達本體“ 之内部所產生之馬達8破損或燒毀。 本發明不限於第1實施形態及第2實施形態。如上述 ，為了保蠖封閉材26之耐久性，以建構成不會承受有關 馬達軸11之垂直方向的抖動之負荷的方式較為適宜，所 以，如第5圖所示，亦可採用將封閉材26之本體26&與馬 達軸1 1之接頭部1 la作成非接觸之構造。封閉材26之本體 2 6a係自安裝部26b沿垂直方向延伸而形成為圓板狀，用 以覆蓋馬達轴11的周圍。而且，此本體26a之馬達軸i i 侧前端，係以非接觸狀^態插入配置於環繞接頭部丨丨a之外 周形成之槽部1 1 c内。根據此種構成，於封閉材2 6與接頭 部11 a之間產生間隙，但由此間隙形成之通向馬達本體i 8 内的路徑相當複雜’所以’異物不容易混入馬達本體i8 内。 【圖式簡單說明】 第1圖為安裳了本發明之第1實施形態的馬達之包縫 機的刖視概略圖。 第2圖為顯示拆下第1圖之馬達時的要部之剖面前視 圖。 弟3圖為顯示第1圖之馬達的要部之剖面前視圖。 -11- 201229350 第4圖為顯示第2實施形態之馬達的剖面前視圖 第5圖為顯示第3實施形態之馬達的剖面前視圖 【主要元件符號說明】 1 缝紉機 2 機座 4 主轴 4 a 接觸面 5 軸承 7 螺栓 8 馬達 9 支架 9a、9b 螺孔 10 皮帶輪 11 馬達轴 1 la 接頭部 1 lb 螺孔 11c 槽部 llca 底面 1 1 cb 側面 lid 軸部 12 風扇 13 軸環 13a 螺孔 14 墊圈 15 螺栓 -12- 201229350 16 螺栓 17 螺栓 18 馬達本體 18a 通孑Li 18b 螺孔 18c 凸緣部 19 螺栓 20 螺栓 21 轉子 22 定子 23 軸承 26 封閉材 26a 本體 26b 安裝部 27 補強構件The resulting rotor, due to the mixing of foreign objects, can cause motor damage or burning. Therefore, the object of the present invention is to provide a direct reduction in the size of the sewing machine when the sewing machine is installed, and to prevent the foreign matter such as dust from being mixed from the outside into the inside of the motor body when being detached from the sewing machine. The horse is for its purpose. [Means for Solving the Problem] The motor structure of the sewing machine according to the first aspect of the invention includes: the motor body 'which constitutes a casing of the motor and has an opening on the sewing machine mounting side, and one end of the motor shaft protrudes from the motor body, and The bearing on the end side is supported by the cantilever to be rotatable, and the other end is formed with a joint portion at the other end. The stator is fixed on the motor shaft; and the stator is disposed on the inner surface of the motor body. The motor construction is characterized by having the inner rotor and the stator also adjacent the opening of the slot body. The rotor is fixed to the inside of the motor and is fixedly connected to the rotor and directly fixed to the main shaft of the sewing machine: the closing material is disposed on the mounting side of the horse-cutting machine to cover the second application of the patent application scope. The secret, the motor structure of the sewing machine of the μ, is the invention of claim 1 of the patent application, the reversal of η+ /, will be levied as the closure material has: the mounting part, which is fixed on the motor body. The red body is formed in a disc shape to cover the periphery of the motor shaft. The sewing machine of the third paragraph of the patent application scope, the ice machine, the crying machine, the motor structure of the knife machine, is the invention of the second application of the patent scope, and the material of the machine is levied as the joint part of the motor shaft. The arrangement is such that the protrusion is not protruded from the opening of the motor body; and a groove portion is formed on the outer circumference of the joint portion; the front end of the body of the sealing material is disposed in the s-slot portion. [Invention Effect] According to the present invention, in the molding, it is possible to achieve the absence of the motor when the sewing machine is removed, thereby preventing the foreign matter from being mixed into the foreign matter due to the size of the direct connection to the sewing machine. The motor on the main shaft of the machine is shortened, and the motor that has been sewn into the motor body is broken or burned. [Embodiment] The first embodiment of the invention is configured to mount the following by the bracket 9 The present invention will be described with reference to Figs. 1 to 3'. On the right side of the base 2 of the sewing machine 1, the 201229350 motor 8 bracket 9 is fixed to the base by the thread check 19, n has (4) the bearing 5 is fixed to the base 2, and the main (four) rotatably breaks the bearing 5 The standard. The end of the main shaft 4 is self-centered. The main end of the main shaft 4 has a fan 12 and a collar 13 interposed therebetween. A bolt 15 is screwed to the spindle 4 on the hinge #14. The circumferential edge of the washer 抵 abuts against the end of the collar 13. The main vehicle is "fastened by the bolts 15, and the fan 12 is held in the bearing 5; the position is between 13" to determine the left and right motors 8 of the fan 12 having the motor body forming the outer casing of the motor 8. 18. The motor body 18 is formed in a tubular shape extending left and right, and a bearing 23 (bearing) is fixed to a right side wall of the motor body 18, and a surface of the motor body 18 opposite to the right side wall The flange portion (8) of the motor body 18 is formed in a protruding shape. The flange portion 18c is provided with screws L18b and 18b which are inserted right and left. Further, a flange portion 18c is provided in the vicinity of the flange portion 18c of the upper portion of the motor body. A through hole "a" that penetrates the motor body 18 up and down. The motor shaft u is horizontally disposed in the motor body 18, and the shaft portion 11d of the motor shaft 11 is supported to be rotatable about the bearing 23. As shown in the first to third figures, the end of the shaft portion Ud protrudes from the motor body 18, and the pulley 10 is fixed by the bolt 7 at the protruding end of the shaft portion ud. A joint portion 丨丨a is provided on the other side of the shaft portion iid (the sewing machine mounting side). The shaft portion 1 1 d and the joint portion iu are on the same axis. The joint portion 11a is formed in a hollow cylindrical shape having an opening at the side head, that is, the sewing machine mounting side, and the inner diameter of the joint portion is formed to be attached to the collar 丨3 of the main shaft 4 with almost no a The size of the way to insert. Further, the joint portion i丨a is disposed so as not to protrude from the sewing machine mounting side opening of the Mata body 18. 2:, a screw hole 1 ib is provided at a position on the head 1 la of the 201229350 which can be concentric with the through hole 18a of the motor body 18. According to the above configuration, the motor shaft is supported by the bearing 23 in a cantilever manner, and similarly to the document 2, the width dimension of the motor 8 when it is attached to the slitting machine 1 can be shortened. A rotor 21' rotor 21 composed of a magnet is fixed around the shaft of the shaft portion u d to rotate with the motor shaft u. Further, a stator 22 composed of a motor coil is fixed to the inner surface of the motor body 18 so as to face the rotor 21. The motor 8 is fixed to the bracket 9 by bolts 20, 2b via the screw holes i8b, 18b of the flange portion 18c and the screw holes 9a, 9a of the bracket". Further, on the joint portion 1 1 a of the motor shaft 1 1 A main shaft 4 to which the collar 丨3 is fixed is fitted. A screw hole 13a is formed in the collar 13 and concentric with the screw hole 丨丨b of the joint portion 丨丨a. The one end of the main shaft 4 is formed. There is a contact surface. The bolt i6 is fixed to the main shaft 4 via the screw hole 111b of the joint portion 11a and the screw hole na of the collar 13 so that the front end of the bolt abuts against the contact surface 4a. The motor shaft is connected and fixed to the main shaft 4 so as to have the same axis as the main shaft 4. Further, in a state where the motor 8 is attached to the sewing machine, the bolts are screwed into the through holes 18a of the motor main body 18. 17. When the bolt 17 is removed from the through hole "a" and a tool such as a screwdriver is inserted into the inside of the body 18 from the through hole i 8a, when the bolt 16 is loosened, the head 1 can be attached from the spindle 4 1 a. The present invention is characterized in that, in the motor structure of the slitting machine constructed as described above, the closing (four) covering the opening of the motor body 18 is disposed in the rotor 21 and the stator 22 which are inside the body 18 closer to the sewing machine side. . The closing member 26 is a main body 26a formed in a disk shape and covering the motor shaft, and a mounting portion 26b extending from the outer periphery of the main body and extending from the outer peripheral level .201229350, and being attached to the mounting portion 26b. The inner peripheral reinforcing member 27 is constituted. The main body 26a and the mounting portion 26b are integrally formed of elastic synthetic rubber or the like. The closing member 26 is fixed to the motor main body 18 by pressing the mounting portion 26b against the inner surface of the motor main body 18. The reinforcing member 27 is formed of a metal product having a shape of "'L," and holding the body 263 and the mounting portion 261 in cross section along the body 26a and the mounting portion 26b of the closing member 26. As shown in Fig. 2, the middle portion of the motor shaft 1 1 side of the main body 26a is bent to have a "<" shape in cross section, and the front end of the motor shaft is in contact with the groove formed around the outer circumference of the joint portion 1 1 a. The side of i丨c is cb. Further, the front end of the motor 26A of the body 26a is formed so as not to contact the bottom surface 1 lea of the groove portion Uc. As described above, the 'motor shaft 11 is a cantilever-type branch by the bearing 2'. Therefore, when the main shaft 4 of the sewing machine 1 and the same axis of the motor shaft 1.1 are displaced to mount the motor 8, there is a fear that the motor shaft 丨丨In the joint portion ["the eccentric rotation", that is, the joint portion Ua is shaken in the direction perpendicular to the axial direction. However, in the above embodiment, the main body 26a is not accepted from the joint portion 11a. The load generated by the shaking in the vertical direction can prevent wear or breakage of the closing member 26. In the case where the main body 26a is in contact with the joint portion Ua, the main body 26a is stretched and contracted by the bent portion of the main body 26a as a fulcrum, so that the cause can be alleviated. As a second embodiment, as shown in FIG. 4, the main body 26a may be bent toward the pulley side from the intermediate portion toward the front end on the motor shaft 丨i side. The front end of the main shaft 26a on the side of the motor shaft 11 is brought into contact with the side surface Ucb of the groove portion nc formed around the outer periphery of the open end of the joint portion Ha. In the second embodiment, the motor shaft of the main body 26a is also constructed. The front side of the side is not connected -10- 201229350 is more suitable for the type of the sewing machine. In the motor structure of the sewing machine constructed as described above, the closing member 26 covering the opening of the motor body 8 is disposed on the rotor 21 of the motor body 1 and The stator 22 is closer to the slitting machine mounting #j, and prevents foreign matter from being mixed into the inside of the motor body 18 from the opening of the motor body 18 when the motor 8 is detached from the sewing machine 1. Since & 'can prevent foreign matter from being mixed into the motor body" The motor 8 generated inside is broken or burned. The present invention is not limited to the first embodiment and the second embodiment. As described above, in order to maintain the durability of the closing member 26, it is preferable to construct a configuration that does not receive the load of the vibration of the motor shaft 11 in the vertical direction. Therefore, as shown in Fig. 5, the closing member may be used. The body 26 of 26 is configured to be non-contact with the joint portion 1 la of the motor shaft 1 1 . The body 2 6a of the closing member 26 is formed in a disk shape extending from the mounting portion 26b in the vertical direction to cover the periphery of the motor shaft 11. Further, the front end of the main body 26a on the motor shaft i i side is inserted into the groove portion 1 1 c formed around the outer periphery of the joint portion 丨丨a in a non-contact state. According to this configuration, a gap is formed between the closing member 26 and the joint portion 11a. However, the path leading to the inside of the motor main body i8 by the gap is complicated. Therefore, the foreign matter is not easily mixed into the motor main body i8. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic perspective view of an overlocking machine for a motor according to a first embodiment of the present invention. Fig. 2 is a front cross-sectional view showing the main part when the motor of Fig. 1 is removed. Figure 3 is a cross-sectional front view showing the main part of the motor of Fig. 1. -11-201229350 Fig. 4 is a cross-sectional front view showing the motor of the second embodiment. Fig. 5 is a cross-sectional front view showing the motor of the third embodiment. [Main component symbol description] 1 Sewing machine 2 Base 4 Main shaft 4 a contact Face 5 Bearing 7 Bolt 8 Motor 9 Bracket 9a, 9b Screw hole 10 Pulley 11 Motor shaft 1 la Joint part 1 lb Screw hole 11c Groove part llca Bottom 1 1 cb Side lid Shaft part 12 Fan 13 Shaft 13a Screw hole 14 Washer 15 Bolt -12- 201229350 16 Bolt 17 Bolt 18 Motor body 18a Tong Li 18b Screw hole 18c Flange 19 Bolt 20 Bolt 21 Rotor 22 Stator 23 Bearing 26 Closing material 26a Main body 26b Mounting part 27 Reinforcing member