JPS6364997B2 - - Google Patents

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、上糸を針の目孔に自動的に挿通す
る糸通し部材を有するミシンにおいて、前記糸通
し部材の操作に連動して、前記上糸を所定の糸供
給経路に沿つて糸掛けし得るミシンの自動糸通し
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention provides a sewing machine having a threading member that automatically inserts an upper thread into an eye of a needle. The present invention relates to an automatic threading device for a sewing machine that can thread thread along a predetermined thread supply path.

従来技術とその解決課題 ミシンを使用して布地を縫製する場合は、糸駒
から操出した上糸を縫針の目孔に通すに先立ち、
予め定められた順序で前記上糸を、糸調子装置、
糸取りばね体および天秤等の各部材に順次掛け渡
して行く糸掛け操作が必要とされる。しかしこの
糸掛け操作は、前述の如く所定の順序に従う必要
があるため手数が繁雑であり、偶にしかミシンを
使わない使用者は、その糸掛け手順につきミシン
操作の都度、取扱説明書を参照しなければならな
い欠点があつた。Prior art and its solutions When sewing fabric using a sewing machine, before passing the upper thread from the thread spool through the eye of the sewing needle,
The upper thread is threaded in a predetermined order by a thread tension device,
It is necessary to perform a threading operation of sequentially threading the thread onto each member such as the thread take-up spring body and the thread take-up thread. However, this threading operation is time-consuming because it is necessary to follow a predetermined order as mentioned above, and users who only use the sewing machine occasionally should refer to the instruction manual each time they operate the sewing machine. There was a drawback that I had to do something about it.

なお最近は、上糸を縫針の目孔に簡単に通すこ
とのできる糸通し部材を備えたミシンが商品化さ
れているが、この糸通し部材は、単に上糸を縫針
の目孔に挿通する補助機能を有するだけであつ
て、糸供給経路に設けた糸調子皿や糸取りばね体
等への糸掛け操作を容易かつ簡略化するものでは
ない。この点に関し本件出願人は、機械的な連動
動作により糸掛けを所定の順序に従つてなし得る
ミシンの自動糸通し装置を開発し、これにつき別
途特願昭57―204249号として特許出願を行なつ
た。この特許出願に係る発明は、従来の手操作に
代えて、糸掛け操作を機械動作により確実に達成
し得るようにした点において高く評価できるが、
その反面として、機構が複雑であつてなお改良の
余地が残されていた。 Recently, sewing machines have been commercialized that are equipped with a threading member that allows the upper thread to be easily passed through the eyelet of the sewing needle. It merely has an auxiliary function, and does not facilitate or simplify the thread threading operation to the thread tension plate, thread take-up spring body, etc. provided in the thread supply path. In this regard, the applicant has developed an automatic threading device for sewing machines that can thread threads in a predetermined order through mechanical interlocking operations, and has filed a separate patent application for this in Japanese Patent Application No. 1983-204249. Summer. The invention related to this patent application can be highly evaluated in that the threading operation can be reliably achieved by mechanical operation instead of the conventional manual operation.
On the other hand, the mechanism was complex and there was still room for improvement.

発明の目的 この発明は、前述したミシンの糸掛け操作に際
し、面倒な手作業を操作者に課している実情に鑑
み、当該欠点を好適に解決するべく案出されたも
のであつて、上糸を縫針の目孔に自動的に挿通さ
せる糸通し部材を備えたミシンにおいて、前記糸
通し部材を動作させる操作と連動的に、上糸を予
め定められた経路に沿い引き出して、糸調子装
置、糸取りばね体および天秤等の各部材に糸掛け
を確実になし得る簡単な構成に係る自動糸通し装
置を提供することを目的とする。Purpose of the Invention The present invention was devised in order to suitably solve the drawbacks in view of the fact that the threading operation of the sewing machine described above requires the operator to perform cumbersome manual work. In a sewing machine equipped with a threading member that automatically inserts thread into the eye of a sewing needle, a thread tension device pulls out the upper thread along a predetermined path in conjunction with the operation of operating the threading member. It is an object of the present invention to provide an automatic threading device having a simple configuration that can reliably thread thread onto each member such as a thread take-up spring body and a thread take-up lever.

課題を解決するための手段 前記課題を克服し、所期の目的を達成するため
本発明は、上糸供給源から糸調子装置、糸取りば
ね体および天秤を経て縫針の目孔に向かう糸供給
経路を介して供給された上糸を、この目孔に通す
ために所定の糸通し運動可能な糸通し部材を備え
たミシンにおいて、 ミシン機枠上における前記糸調子装置並びに糸
取りばね体の配設位置および前記天秤の所定の停
止位置を夫々通る経路の形状に対応した形状の案
内面が形成され、かつ前記ミシン機枠に固定され
た案内体と、 前記上糸供給源からの上糸を捕捉する捕捉部が
形成され、前記案内面に沿う糸掛け運動可能な糸
捕捉部材と、 ミシン機枠上で移動操作可能に装着された１つ
の操作体と、 前記操作体の操作に従つて、前記糸掛け運動並
びに糸通し運動を前記糸捕捉部材および糸通し部
材に付与するために、操作体と前記両部材とを作
動的に連結する連結部材とから構成したことを特
徴とする。Means for Solving the Problems In order to overcome the above problems and achieve the intended purpose, the present invention provides a thread supply path from an upper thread supply source to an eye of a sewing needle via a thread tension device, a thread take-up spring body, and a thread thread take-up. In a sewing machine equipped with a threading member capable of performing a predetermined threading movement in order to pass the upper thread supplied through the eye through the eye, the thread tension device and the thread take-up spring body are arranged on the sewing machine frame. and a guide body having a shape corresponding to the shape of a path passing through a predetermined stop position of the thread take-up, and which is fixed to the sewing machine frame; and a guide body that captures the needle thread from the needle thread supply source. a thread catching member formed with a catching portion and capable of threading movement along the guide surface; an operating body movably mounted on the sewing machine frame; In order to impart a threading motion and a threading motion to the thread catching member and the threading member, the present invention is characterized by comprising an operating body and a connecting member that operatively connects the two members.

実施例 次に、本発明に係るミシンの自動糸通し装置に
つき、好適な実施例を挙げて、添付図面を参照し
ながら以下説明する。Embodiments Next, an automatic threading device for a sewing machine according to the present invention will be described below with reference to preferred embodiments and the accompanying drawings.

（ミシンの基本構造について） 図において参照符号１０はミシン機枠を示し、
このミシン機枠１０における頭部に、面板１２が
着脱自在に装着されている。なお図示しないが、
ミシン機枠１０の一部を構成する上方アーム１４
の上面に糸立て棒が直立配置され、この糸立て棒
に挿通支持した糸駒が上糸供給源となる。(About the basic structure of the sewing machine) In the figure, reference numeral 10 indicates the sewing machine frame;
A face plate 12 is detachably attached to the head of the sewing machine frame 10. Although not shown,
Upper arm 14 forming part of sewing machine frame 10
A spool pin is arranged upright on the upper surface of the spool, and a thread spool inserted and supported by the spool pin serves as a needle thread supply source.

第１図に示す如く、アーム１４の前方端面に所
要形状を有する取付板１６が固定され、この取付
板１６の左上端部および背面部に、夫々公知の糸
案内１８および糸調子皿２０が配設されている。
前記糸案内１８は、取付板１６の左肩部に沿う案
内溝２２ａを形成する糸案内板２２と、この糸案
内板２２の面部に弾力当接して前記案内溝２２ａ
の閉成端を閉塞する弾性板２４とから構成され、
前記糸供給源から操出された上糸２６は、案内溝
２２ａを経た後、糸案内板２２と弾性板２４との
間を通過して右方へ引出される。なお糸調子皿２
０は、糸案内１８から到来する上糸２６を挾持し
て該上糸２６に適度の張力を付与するものであ
る。 As shown in FIG. 1, a mounting plate 16 having a desired shape is fixed to the front end surface of the arm 14, and a known thread guide 18 and a thread tension plate 20 are arranged at the upper left end and back surface of the mounting plate 16, respectively. It is set up.
The thread guide 18 includes a thread guide plate 22 forming a guide groove 22a along the left shoulder of the mounting plate 16, and a thread guide plate 22 that elastically contacts the surface of the thread guide plate 22 to form a guide groove 22a.
and an elastic plate 24 that closes the closed end of the
The needle thread 26 discharged from the thread supply source passes through the guide groove 22a, passes between the thread guide plate 22 and the elastic plate 24, and is pulled out to the right. In addition, thread tension plate 2
0 is for pinching the upper thread 26 coming from the thread guide 18 and applying appropriate tension to the upper thread 26.

第１図において、取付板１６の右上部前方に天
秤２８が揺動自在に枢支され、図示しないベルク
ランク機構を介して所要の糸引上げ運動が付与さ
れるようになつている。この天秤２８は、上糸２
６を挿通係止させるためのスリツト２８ａを有
し、このスリツト２８ａは、針棒３０を引上げて
加工布の縫製を待機している初期状態において、
該スリツトの開口始端となる天秤先端を斜め右上
方に指向させ、かつ取付板１６の水平頂部より若
干突出させる位置に設定されている。 In FIG. 1, a thread take-up 28 is pivotally supported in front of the upper right corner of the mounting plate 16 so as to be able to swing freely, and a required thread pulling movement is applied via a bell crank mechanism (not shown). This thread take-up 28
The slit 28a has a slit 28a for inserting and locking the needle bar 6, and this slit 28a is used in the initial state when the needle bar 30 is pulled up and waiting for sewing the work cloth.
The tip of the balance, which is the starting end of the slit, is oriented obliquely upward and to the right, and is set at a position where it slightly protrudes from the horizontal top of the mounting plate 16.

同じく第１図において、前記取付板１６の中間
部でかつ右下方に、適宜の弾性線材を所要形状に
折曲してなる糸取りばね体３２が固定されてい
る。この糸取りばね体３２の開放端部３２ａは、
後述する糸捕捉部材６０における捕捉部６０ａが
移動する際の通過軌跡に臨んでおり、一連の糸掛
けおよび糸通し動作の終期付近で上糸２６を引張
ることによつて、該上糸２６が糸取りばね体３２
に掛着されるようになつている。そして前述した
糸調子皿２０、天秤２８および糸取りばね体３２
における各糸掛け部位をもつて一連の糸供給経路
が形成され、この経路は更に縫針４２の目孔４０
にまで続く。なお第１図において、符号９６は糸
案内を示し、上糸２６はその折曲部９６ａに沿つ
て下方へ案内される。また符号９８は、別の糸案
内を指示する。 Similarly, in FIG. 1, a thread take-up spring body 32 made of a suitable elastic wire bent into a desired shape is fixed at the middle and lower right side of the mounting plate 16. The open end 32a of this thread take-up spring body 32 is
It faces the passing locus of the movement of a catching part 60a of a thread catching member 60, which will be described later, and by pulling the upper thread 26 near the end of a series of threading and threading operations, the upper thread 26 can be thread-taken. Spring body 32
It is becoming more and more popular. The thread tension disc 20, thread take-up lever 28 and thread take-up spring body 32 mentioned above
A series of thread supply paths are formed by each thread hooking portion in the needle 42.
It continues until. In FIG. 1, reference numeral 96 indicates a thread guide, and the upper thread 26 is guided downward along the bent portion 96a. Further, reference numeral 98 indicates another thread guide.

（針棒および糸通し部材について） ミシン頭部の内部には、針棒支枠３６が支軸３
８（第２図）により揺動自在に軸支されて垂下
し、この針棒支枠３６に針棒３０が上下動自在に
挿通支持されている。この針棒３０の下端には、
目孔４０を有する縫針４２が、針抱き４４を介し
て取付けられている。更に該針棒支枠３６には、
第１図において手前側に位置して糸通し棒４６が
上下動自在に挿通支持され、この糸通し棒４６は
圧縮ばね（図示せず）により常時下方に向けて付
勢されると共に、その下端部に糸掛け４８ａおよ
びフツク４８ｂを備えた糸通し部材４８が固定さ
れている。(About the needle bar and threading member) Inside the sewing machine head, the needle bar support frame 36 is attached to the support shaft 3.
8 (FIG. 2) and hangs down, and the needle bar 30 is inserted and supported in this needle bar support frame 36 so as to be vertically movable. At the lower end of this needle bar 30,
A sewing needle 42 having an eye hole 40 is attached via a needle holder 44. Furthermore, the needle bar support frame 36 includes
In FIG. 1, a threading rod 46 is inserted and supported so as to be movable up and down at the front side in FIG. A threading member 48 having a thread hook 48a and a hook 48b is fixed to the section.

この糸通し棒４６は、引張ばね５０により常に
上方に引張付勢された半円筒状の糸通し作動部材
５２に摺動自在に内挿され、当該部材５２の外周
に斜めに穿設したスロツト５４に、前記糸通し棒
４６に直交挿通したピン５６の一部が嵌挿されて
いる。そして糸通し作動部材５２を、後述する操
作体６２により下方へ押圧付勢すれば、前記糸通
し棒４６は、糸通し作動部材５２と共に所定スト
ロークだけ垂直に降下（軸周りに回動することな
く）し、次いで前記ピン５６とスロツト５４との
カム作用下に中心軸線の周りを時計方向に回動し
て、前記糸通し部材４８に針目孔４０への糸通し
運動を付与する。なお、前述した糸通し棒４６、
糸通し部材４８および糸通し作動部材５２から構
成される糸通し機構については、本件出願人の別
の出願に係る実開昭54―43878号公報に詳細に開
示されている。 The threading rod 46 is slidably inserted into a semi-cylindrical threading actuating member 52 which is always tensilely biased upward by a tension spring 50, and is inserted into a slot 54 diagonally formed on the outer periphery of the member 52. A part of the pin 56 inserted orthogonally through the threading rod 46 is fitted therein. When the threading actuating member 52 is pressed downward by an operating body 62, which will be described later, the threading rod 46 is vertically lowered by a predetermined stroke (without rotating around the axis) together with the threading actuating member 52. ) and then rotated clockwise about the central axis under the cam action of the pin 56 and the slot 54 to impart threading movement to the needle hole 40 to the threading member 48. In addition, the threading rod 46 mentioned above,
The threading mechanism comprised of the threading member 48 and the threading operating member 52 is disclosed in detail in Japanese Utility Model Application No. 54-43878, which is another application filed by the present applicant.

（糸掛け機構について） 次に、本実施例の要旨をなす糸掛け機構の詳細
につき説明する。この糸掛け機構は、糸供給経
路と対応する形状に設定した案内面５８ａを有す
る板状案内体５８と、前記上糸２６を捕捉し案
内面５８ａに沿つて糸掛け運動を行なう糸捕捉部
材６０と、ミシン機枠１０上に移動操作可能に
装着された操作体６２と、前記操作体６２と糸
捕捉部材６０および糸通し部材４８とを作動的に
連結して糸掛け運動および糸通し運動を行なわせ
る連結部材６４とから基本的に構成される。(Regarding the Threading Mechanism) Next, details of the threading mechanism which forms the gist of this embodiment will be described. This threading mechanism includes a plate-shaped guide body 58 having a guide surface 58a set in a shape corresponding to the thread supply path, and a thread catching member 60 that captures the upper thread 26 and performs thread threading motion along the guide surface 58a. and an operating body 62 movably mounted on the sewing machine frame 10, and operatively connecting the operating body 62, the thread catching member 60, and the threading member 48 to perform threading and threading movements. It basically consists of a connecting member 64 that is connected.

〔案内体５８について〕 符号５８で示す案内体は、第１図および第２図
に示す如く、ミシン機枠１０の頭部に装着した面
板１２の内部所定位置に、ねじ６６，６６を介し
て垂直に取付けた板体で構成され、この案内体５
８には、後述する糸捕捉部材６０の先端に設けた
捕捉部６０ａに所要の糸掛け運動を付与するため
の案内面５８ａが形成されている。すなわち案内
面５８ａは、殊に第１図から判明する如く、前記
天秤２８の所定の停止位置（針棒３０が上昇限界
近傍に達して縫製開始を待機している位置）、ミ
シン機枠１０に設けた前記糸調子皿２０および糸
取りばね体３２の配設位置を順に経由する屈曲形
状と略相似的に対応した形状の抜き溝として形成
されている。なお、前記の天秤２８、糸調子皿２
０および糸取りばね体３２を順に経由する屈曲形
状を、第５図に、後述する捕捉部６０ａが辿る軌
跡として２点鎖線で示す。[About the guide body 58] As shown in FIGS. 1 and 2, the guide body 58 is inserted into a predetermined position inside the face plate 12 attached to the head of the sewing machine frame 10 via screws 66, 66. This guide body 5 is composed of a plate mounted vertically.
8 is formed with a guide surface 58a for imparting a required threading motion to a catching portion 60a provided at the tip of a thread catching member 60, which will be described later. In other words, as is clear from FIG. 1, the guide surface 58a is located at a predetermined stopping position of the thread take-up lever 28 (the position where the needle bar 30 has reached near its upper limit and is waiting to start sewing), and at the sewing machine frame 10. It is formed as a cutout groove having a shape substantially corresponding to the bent shape passing through the disposed positions of the thread tension plate 20 and the thread take-up spring body 32 in order. In addition, the above-mentioned balance 28 and thread tension plate 2
0 and the thread take-up spring body 32 in order are shown in FIG. 5 by a two-dot chain line as a locus followed by a catching portion 60a, which will be described later.

〔糸捕捉部材６０について〕 第４図に全体形状を明確に示す糸捕捉部材６０
は、その上部自由端に特殊な形状をなす捕捉部６
０ａが一体的に形成されて、上糸供給源から到来
する上糸２６の捕捉を容易化している。また下部
自由端は、後述する糸通しスライダ６８に取付け
られ、該スライダ６８を前記案内体５８の案内面
５８ａに挿入することにより、該糸捕捉部材６０
を案内面５８ａに沿つて移動させ得るようになつ
ている。すなわち第３図および第７図に示す如
く、前記取付板１６より左方に位置するミシン機
枠１０に支持板７２がねじ７４で垂直に固定さ
れ、逆「く」字状をなす回動レバー７６の下端部
が、前記支持板７２に支持軸７８を介して軸支さ
れ、所定中心角内で垂直旋回自在となつている。[About the thread catching member 60] The thread catching member 60 whose overall shape is clearly shown in FIG.
has a special shaped catching part 6 at its upper free end.
0a is integrally formed to facilitate capture of the upper thread 26 coming from the upper thread supply source. The lower free end is attached to a threading slider 68 (described later), and by inserting the slider 68 into the guide surface 58a of the guide body 58, the thread catching member 60
can be moved along the guide surface 58a. That is, as shown in FIGS. 3 and 7, a support plate 72 is vertically fixed to the sewing machine frame 10 located to the left of the mounting plate 16 with screws 74, and a rotating lever forming an inverted "dog" shape is formed. The lower end portion of the support plate 76 is supported by the support shaft 78 via the support shaft 78, and is vertically pivotable within a predetermined central angle.

なお前記支持軸７８には、第４図および第７図
に示す如く捩りばね８０が挿通支持され、該ばね
８０の両端部は支持板７２と回動レバー７６の一
端部との間に弾力的に係着されて、該回動レバー
７６を常には第１図および第５図に示す実線位置
に保持するよう持上げ付勢している。すなわち該
捩りばね８０は、前記糸捕捉部材６０の捕捉部６
０ａが、糸調子皿２０、糸取りばね体３２および
天秤２８の内の何れよりも前記上糸供給源に最も
近い糸供給経路中の位置の近傍であつて、かつ糸
供給経路から外れた所定位置に位置するように、
前記回動レバー７６を常時上方に付勢するもので
ある。この回動レバー７６は、これを第１図に示
す如く支持板７２に軸支した状態において、その
他方の自由端部７６ａに、前記案内体５８の案内
面５８ａと交差する方向に延在する長溝８２が穿
設されている。そして、後述する糸通しスライダ
６８のガイド軸７０が、この長溝８２および案内
体５８の案内面５８ａに共通的に挿通されるよう
になつている。 A torsion spring 80 is inserted into and supported by the support shaft 78 as shown in FIGS. The rotary lever 76 is normally held at the solid line position shown in FIGS. 1 and 5 so as to be biased upwardly. That is, the torsion spring 80 is connected to the catching portion 6 of the thread catching member 60.
0a is a predetermined position in the vicinity of a position in the thread supply path that is closest to the upper thread supply source than any of the thread tension disc 20, thread take-up spring body 32, and thread take-up lever 28, and that is outside the thread supply path. to be located in
The rotary lever 76 is always urged upward. The rotary lever 76 extends in a direction intersecting the guide surface 58a of the guide body 58 at the other free end 76a while being pivotally supported on the support plate 72 as shown in FIG. A long groove 82 is bored. A guide shaft 70 of a threading slider 68, which will be described later, is inserted through the long groove 82 and the guide surface 58a of the guide body 58 in common.

〔糸通しスライダ６８について〕 糸通しスライダ６８は、第４図に示す如く、ブ
ロツク状の基体６８ａと、その左右側面に固着し
た一対の抱持板６８ａ，６８ｂと、前記基体６８
ａの基部前面に水平に突設したガイド軸７０とか
らなり、各抱持板６８ｂはその自由端部を基体６
８ａの前方内方へ直角に折曲させて、基体前面と
の間に前記回動レバー７６の板厚に相当する間隙
を保持している。この糸通しスライダ６８は、第
７図に示すように、その基体６８ａを回動レバー
７６における自由端部７６ａの背面に位置させ、
前記一対の抱持板６８ｂ，６８ｂにより該自由端
部７６ａを両側部から抱持するように嵌挿するこ
とにより、当該スライダ６８は回動レバー７６に
対し摺動自在に支持される。糸通しスライダ６８
の前記ガイド軸７０は、その先端が截頭円錐状に
形成されると共に外周に凹溝７０ａが周設され、
該スライダ６８を回動レバー７６に挿通支持した
状態において、前記長溝８２に挿通されて前方へ
突出するようになつている。そして第２図および
第７図に示す如く、前記糸捕捉部材６０は、その
下部自由端（第４図に符号６０ｂとして示す）を
糸通しスライダ６８の背面に埋設固定されて垂直
に起立している。[Regarding the threading slider 68] As shown in FIG.
Each holding plate 68b has a guide shaft 70 projecting horizontally from the front surface of the base of
8a is bent inward at a right angle to maintain a gap corresponding to the plate thickness of the rotating lever 76 between the lever 8a and the front surface of the base body. As shown in FIG. 7, this threading slider 68 has its base body 68a located on the back side of the free end portion 76a of the rotating lever 76,
The slider 68 is slidably supported by the rotating lever 76 by fitting the free end portion 76a so as to be held from both sides by the pair of holding plates 68b, 68b. Threading slider 68
The guide shaft 70 has a truncated conical tip and a concave groove 70a around the outer periphery,
When the slider 68 is inserted and supported by the rotating lever 76, it is inserted into the long groove 82 and projects forward. As shown in FIGS. 2 and 7, the thread catching member 60 has its lower free end (indicated by reference numeral 60b in FIG. 4) buried and fixed in the back surface of the threading slider 68, and stands vertically. There is.

〔スライダ６８を回動レバー７６の長溝下部に常
時引張り付勢する手段について〕 また第４図に示す如く、回動レバー７６の本体
部から分岐させたアーム７６ｂに運動伝達ピン９
０がカシメ接続され、このピン９０は後述する連
結部材６４の下端面と係合離脱自在に当該可能に
なつている。更に、回動レバー７６の本体部中央
に後述するばね係着用のピン８４が突出固定され
ると共に、該本体部と自由端部７６ａとの屈曲部
近傍にばね支持ピン８６が突出固定されている。
そして第７図に示す如く、前記ばね係着用のピン
８４と糸通しスライダ６８のガイド軸７０（前記
長溝８２を介して突出している）との間に引張ば
ね８８が弾力的に係着されると共に、この引張ば
ね８８は前記ばね支持ピン８６に周設した陥凹溝
中に摺動自在に落着している。[Means for constantly pulling and biasing the slider 68 against the lower part of the long groove of the rotary lever 76] As shown in FIG.
0 is connected by caulking, and this pin 90 can freely engage and disengage from the lower end surface of a connecting member 64, which will be described later. Furthermore, a pin 84 for spring engagement, which will be described later, is protruded and fixed at the center of the main body of the rotating lever 76, and a spring support pin 86 is protruded and fixed near the bend between the main body and the free end 76a. .
As shown in FIG. 7, a tension spring 88 is elastically engaged between the spring engagement pin 84 and the guide shaft 70 (projecting through the long groove 82) of the threading slider 68. At the same time, the tension spring 88 is slidably seated in a recessed groove provided around the spring support pin 86.

従つて、第５図に実線で示す如く、作動前の待
機姿勢において、糸捕捉部材６０を固設した糸通
しスライダ６８は、引張ばね８８の引張り弾力に
より、回動レバー７６における長溝８２の下部に
常時引張り付勢されている。そして、支持軸７８
を中心として回動レバー７６を時計方向へ垂直旋
回させれば、該引張ばね８８はばね支持ピン８６
の陥凹溝に沿つて摺動しつつ引張され、第５図に
２点鎖線で示すように、回動レバー７６の長溝８
２に沿つて糸通しスライダ６８が摺動移動するの
を許容する。 Therefore, as shown by the solid line in FIG. 5, in the standby position before operation, the threading slider 68 to which the thread catching member 60 is fixedly attached is moved by the lower part of the long groove 82 in the rotary lever 76 due to the tensile elasticity of the tension spring 88. is constantly tensioned. And the support shaft 78
When the pivot lever 76 is vertically pivoted clockwise around
The long groove 8 of the rotating lever 76 is pulled while sliding along the recessed groove of the rotary lever 76, as shown by the two-dot chain line in FIG.
The threading slider 68 is allowed to slide along 2.

〔操作体６２と連結部材６４とについて〕 次に、前記回動レバー７６および糸通し部材４
８に所定の糸掛け運動および糸通し運動を行なわ
せる運動伝達機構について説明する。第２図およ
び第４図に示すように、ミシン頭部に装着される
面板１２の中央部に所定幅のスリツト９２が垂直
に穿設され、このスリツト９２に合成樹脂製の摘
み状操作体６２が摺動自在に嵌挿されている。こ
の操作体６２は、図示の連結部材６４を介して前
記回動レバー７６および糸通し作動部材５２に作
動的に連結される。[Regarding the operating body 62 and the connecting member 64] Next, the rotating lever 76 and the threading member 4
A motion transmission mechanism for causing the threading machine 8 to perform predetermined threading and threading motions will be explained. As shown in FIGS. 2 and 4, a slit 92 of a predetermined width is perpendicularly bored in the center of the face plate 12 attached to the head of the sewing machine, and a knob-like operating body 62 made of synthetic resin is inserted into the slit 92. is slidably inserted. The operating body 62 is operatively connected to the rotary lever 76 and the threading actuating member 52 via a connecting member 64 shown in the figure.

すなわち連結部材６４は、第４図に斜視状態で
示すように、コ字状に折曲した金属板からなり、
該連結部材６４には夫々反対方向に水平に延出す
る舌片６４ａ，６４ｂが一体的に形成されてい
る。そして前記一方の舌片６４ａは、操作体６２
に形成した内方突起部６２ａに埋設固定され、ま
た前記他方の舌片６４ｂは、前記糸通し作動部材
５２の頂部に成形した垂直突片５２ａの水平切欠
部５２ｂに係着されるようになつている。なお第
４図に示す如く、連結部材６４の側方にばね係着
片６４ｃが形成され、このばね係着片６４ｃと面
板１２の上部内面とに引張ばね９４を弾力的に介
装することにより（第２図参照）、前記操作体６
２および連結部材６４は常時上方へ引張り付勢さ
れている。 That is, the connecting member 64 is made of a metal plate bent in a U-shape, as shown in perspective in FIG.
The connecting member 64 is integrally formed with tongue pieces 64a and 64b extending horizontally in opposite directions. The one tongue piece 64a is connected to the operating body 62.
The other tongue piece 64b is fixed to a horizontal notch 52b of a vertical protrusion 52a formed on the top of the threading operation member 52. ing. As shown in FIG. 4, a spring engaging piece 64c is formed on the side of the connecting member 64, and a tension spring 94 is elastically interposed between the spring engaging piece 64c and the upper inner surface of the face plate 12. (See FIG. 2), the operating body 6
2 and the connecting member 64 are always pulled upwardly.

また第１図および第２図に示すように、連結部
材６４が引張ばね９４により上方付勢されて静止
している状態において、前記回動レバー７６の分
岐アーム７６ｂに設けた運動伝達ピン９０は、前
記連結部材６４の底面に当接して、該回動レバー
７６の上方への位置規制がなされている。すなわ
ち前記操作体６２は、第４図および殊に第７図に
示す如く、連結部材６４を介して回動レバー７６
および糸通し作動部材５２に作動的に連結されて
いる。そして該操作体６２を下降させることによ
り、公知の如く糸通し作動部材５２は、その糸通
し運動を開始する。また回動レバー７６は下方へ
の押圧力が付与され、後述するように時計方向に
旋回して、糸通しスライダ６８に固設した糸捕捉
部材６０に所要の糸掛け運動を付与するべく作動
する。 Further, as shown in FIGS. 1 and 2, when the connecting member 64 is biased upwardly by the tension spring 94 and is stationary, the motion transmitting pin 90 provided on the branch arm 76b of the rotary lever 76 is , comes into contact with the bottom surface of the connecting member 64 to restrict the upward position of the rotating lever 76. That is, as shown in FIG. 4 and particularly FIG.
and operatively connected to threading actuation member 52 . Then, by lowering the operating body 62, the threading operation member 52 starts its threading movement as is known in the art. Further, the rotating lever 76 is applied with a downward pressing force and rotates clockwise as will be described later, and operates to apply a required threading motion to the thread catching member 60 fixed to the threading slider 68. .

実施例の作用 次に、このように構成した実施例に係る自動糸
通し装置の作用につき説明する。操作体６２に操
作力を加えない初期状態を、第１図，第６図ａお
よび第７図に示す。この状態において、回動レバ
ー７６は、前記捩りばね８０の弾力作用下に支持
軸７８を中心として上方へ持上げ付勢され、その
運動伝達ピン９０を連結部材６４の底面に当接さ
せて上方規制がなされている。これにより糸捕捉
部材６０の捕捉部６０ａは、糸調子皿２０、糸取
りばね体３２および天秤２８の内の何れよりも前
記上糸供給源に近い糸供給経路中の位置の近傍
で、かつ糸供給経路から外れた所定位置に位置し
ている。Effects of the Embodiment Next, the effects of the automatic threading device according to the embodiment configured as described above will be explained. An initial state in which no operating force is applied to the operating body 62 is shown in FIGS. 1, 6a, and 7. In this state, the rotating lever 76 is lifted and biased upward about the support shaft 78 under the elastic action of the torsion spring 80, and its motion transmission pin 90 is brought into contact with the bottom surface of the connecting member 64 to restrict the upward movement. is being done. As a result, the catching portion 60a of the thread catching member 60 is located near a position in the thread supply path that is closer to the upper thread supply source than any of the thread tension plate 20, thread take-up spring body 32, and thread take-up lever 28, and It is located at a predetermined location off the route.

また糸通し作動部材５２は、前記引張ばね５０
により上方へ付勢されて、その上昇限界で静止し
ている。この状態において、糸通しスライダ６８
に突設した前記ガイド軸７０は、回動レバー７６
の長溝８２および案内体５８の案内面５８ａに共
通的に挿通されて、第１図に示す案内面５８ａの
始端に当接位置している。更に針棒３０もその上
昇限界付近で停止し、図示しない主軸およびベル
クランクを介して連接された天秤２８を、取付板
１６の頂面より上方に臨ませて静止している。 Further, the threading operation member 52 is connected to the tension spring 50.
It is urged upward by the force and remains stationary at the limit of its rise. In this state, the threading slider 68
The guide shaft 70 protruding from the rotary lever 76
It is commonly inserted through the long groove 82 and the guide surface 58a of the guide body 58, and is in contact with the starting end of the guide surface 58a shown in FIG. Further, the needle bar 30 also stops near its upper limit, and stands still with the balance 28 connected via a main shaft (not shown) and a bell crank facing above the top surface of the mounting plate 16.

この初期状態において、先ず手操作により上糸
２６を上糸供給源から繰出して糸案内板２２の案
内溝２２ａに通し、弾性板２４との間に挾持させ
た後、糸捕捉部材６０の捕捉部６０ａに手前側か
ら巻掛ける。次いで上糸２６をそのまま天秤２８
の左側（第１図において）から斜め下方へ降し、
前記糸案内９６の折曲部９６ａを通過して下方の
糸案内９８に掛けた後、該上糸を右手で軽く引張
つて緊張させる。この状態で、前記操作体６２を
左手で下方へ押圧すれば、操作体６２と共に連結
部材６４も降下し、該連結部材６４に連繋接続し
ている糸通し作動部材５２を垂直に降下させて、
その糸通し部材４８を縫針４２における目孔４０
の位置まで到来させる（第６図ｄ参照）。 In this initial state, first, the needle thread 26 is manually drawn out from the needle thread supply source, passed through the guide groove 22a of the thread guide plate 22, and held between the elastic plate 24 and the thread catching member 60. Wrap it around 60a from the front side. Next, thread the upper thread 26 as it is on the thread take-up 28.
descend diagonally downward from the left side (in Figure 1),
After passing through the bent portion 96a of the thread guide 96 and hanging on the lower thread guide 98, the upper thread is slightly pulled with the right hand to make it tense. In this state, if the operating body 62 is pressed downward with the left hand, the connecting member 64 will also descend together with the operating body 62, and the threading operation member 52 connected to the connecting member 64 will be vertically lowered.
The threading member 48 is inserted into the eye hole 40 of the sewing needle 42.
(see Figure 6d).

この操作体６２が下降する過程において、第６
図ｂに示すように、前記連結部材６４はその底面
に接触している運動伝達ピン９０を介して回動レ
バー７６に下方への旋回力を与える。このため回
動レバー７６は、捩りばね８０の弾力に抗して支
持軸７８を中心に時計方向への垂直旋回を開始す
る。すなわち回動レバー７６が旋回し始めると、
その自由端部７６ａも一体的に垂直旋回を行な
う。しかるに、この自由端部７６ａに摺動自在に
抱持された糸通しスライダ６８は、そのガイド軸
７０を回動レバー７６の長溝８２および案内板５
８の案内面５８ａに共通的に挿通され、その移動
方向の規制がなされている。 In the process of this operation body 62 descending, the sixth
As shown in Figure b, the connecting member 64 applies a downward pivoting force to the pivoting lever 76 via a motion transmitting pin 90 that is in contact with the bottom surface thereof. Therefore, the rotating lever 76 starts vertically rotating clockwise about the support shaft 78 against the elasticity of the torsion spring 80. That is, when the rotary lever 76 begins to rotate,
The free end 76a also integrally pivots vertically. However, the threading slider 68 slidably held by the free end 76a moves its guide shaft 70 between the long groove 82 of the rotary lever 76 and the guide plate 5.
It is commonly inserted through the guide surfaces 58a of 8, and its movement direction is regulated.

従つて操作体６２の下降に伴い、前記ガイド軸
７０は案内板５８の案内面５８ａの形成輪郭を辿
つて移動する。また当該ガイド軸７０は、前述の
如く回動レバー７６の長溝８２にも挿通されてい
るから、この長溝８２に沿う直線摺動も行なう。
このように前記ガイド軸７０が、案内板５８の案
内面５８ａを屈曲的に辿ると共に、回動レバー７
６の長溝８２に沿う直線摺動も行なう結果とし
て、糸通しスライダ６８および該スライダに固設
した糸捕捉部材６０の捕捉部６０ａには、ガイド
軸７０の屈曲移動と直線移動とを合成した運動が
付与される。 Therefore, as the operating body 62 descends, the guide shaft 70 moves along the contour of the guide surface 58a of the guide plate 58. Further, since the guide shaft 70 is also inserted through the long groove 82 of the rotary lever 76 as described above, it also performs linear sliding along this long groove 82.
In this way, the guide shaft 70 curves along the guide surface 58a of the guide plate 58, and the rotating lever 70
As a result of linear sliding along the long groove 82 of the guide shaft 70, the threading slider 68 and the catching portion 60a of the thread catching member 60 fixed to the slider have a movement that is a combination of the bending movement and the linear movement of the guide shaft 70. will be granted.

すなわち、操作体６２の下降により、ガイド軸
７０は先ず案内板５８の案内面５８ａに沿つて、
第６図ｂに示す如く斜め右上方に上昇し、これに
より糸通しスライダ６８を、回動レバー７６の長
溝８２に沿つて直線移動させる。これにより、糸
通しスライダ６８に固設した糸捕捉部材６０の前
記捕捉部６０ａは、第５図に矢印Ａで示す２点鎖
線の位置に到来する。このとき、天秤２８のスリ
ツト２８ａは、その開口始端を斜め右上方に指向
させて取付板１６の水平頂部より若干突出させて
いるので、捕捉部６０ａに掛けた上糸２６は該ス
リツト２８ａに掛け渡される。 That is, as the operating body 62 descends, the guide shaft 70 first moves along the guide surface 58a of the guide plate 58.
As shown in FIG. 6b, the threading slider 68 is moved diagonally upward and to the right, thereby moving the threading slider 68 linearly along the long groove 82 of the rotating lever 76. As a result, the catching portion 60a of the thread catching member 60 fixedly attached to the threading slider 68 comes to the position indicated by the two-dot chain line indicated by arrow A in FIG. At this time, the opening starting end of the slit 28a of the balance 28 is directed diagonally upward and to the right, so that it slightly protrudes from the horizontal top of the mounting plate 16, so the needle thread 26 that has been hung on the catching part 60a is hung on the slit 28a. passed on.

操作体６２が更に下降すると、第６図ｃに示す
ように、ガイド軸７０は案内板５８の案内面５８
ａの略中間部まで下降し、また糸通しスライダ６
８をレバー長溝８２に沿つて更に直線移動させ
る。これにより糸捕捉部材６０の捕捉部６０ａ
は、第５図に矢印Ｂで示す２点鎖線の位置にまで
到来する。そして捕捉部６０ａに掛けた上糸２６
を引張つて、天秤２８のスリツト２８ａに掛け渡
した上糸２６を緊張させる。 When the operating body 62 is further lowered, the guide shaft 70 touches the guide surface 58 of the guide plate 58, as shown in FIG. 6c.
The threading slider 6 descends to approximately the middle of a.
8 is further linearly moved along the lever long groove 82. As a result, the catching portion 60a of the thread catching member 60
reaches the position indicated by the two-dot chain line indicated by arrow B in FIG. Then, the upper thread 26 hooked on the catching part 60a
is pulled to tension the upper thread 26 that is passed through the slit 28a of the thread take-up 28.

そして操作体６２の下降が終期に達すると、第
６図ｄおよび第５図の２点鎖線に示すように、ガ
イド軸７０は案内面５８ａの最下端まで下降し、
また糸通しスライダ６８をレバー長溝８２に沿う
最大限界位置まで直線移動させる。すると、捕捉
部６０ａは、第５図に矢印Ｃで示す位置にまで到
来し、捕捉部６０ａは上糸２６を糸調子皿２０を
通して前記糸取りばね体３２の下方に位置する糸
案内９６の下端まで引出す。このように操作体６
２がその下降限界に達した時点で、前記の糸通し
部材４８は、糸通し作動部材５２のスロツト５４
とピン５６とのカム作用下に時計方向に水平回動
し、そのフツク４８ｂは縫針４２の目孔４０中に
挿通されている。従つて、糸通し部材４８におけ
る糸通しを行なえつた時点で、上糸２６は天秤２
８および糸調子皿２０に糸掛けされている。 When the lowering of the operating body 62 reaches the final stage, the guide shaft 70 descends to the lowest end of the guide surface 58a, as shown by the two-dot chain line in FIG. 6d and FIG.
Further, the threading slider 68 is linearly moved along the lever long groove 82 to the maximum limit position. Then, the catching part 60a reaches the position shown by arrow C in FIG. Pull out. In this way, the operating body 6
2 reaches its lowering limit, the threading member 48 is inserted into the slot 54 of the threading actuating member 52.
The hook 48b is horizontally rotated clockwise under the cam action of the sewing needle 42 and the pin 56, and the hook 48b is inserted into the eye hole 40 of the sewing needle 42. Therefore, when threading is completed in the threading member 48, the upper thread 26 reaches the thread take-up lever 2.
8 and thread tension plate 20.

次に、目孔４０への糸通しを越えて操作体６２
に対する押圧力を解放すると、引張ばね９４の弾
力復帰作用下に、操作体６２は原位置へ復帰す
る。また運動伝達ピン９０への連結部材６４によ
る押圧力が解除される結果、捩りばね８０および
回動レバー７６とガイド軸７０とに介装した引張
ばね８８の復元弾力により、前記回動レバー７６
は反時計方向に回動して初期状態に復帰する。従
つて糸通しスライダ６８およびこれに固定した糸
捕捉部材６０は、第５図に示した軌跡を逆に辿つ
て復帰し、これにより上糸２６は捕捉部６０ａか
ら離脱して、前記糸取りばね体３２の下方でたる
んだ状態となる。そこで操作者が、前記糸通し部
材４８により縫針４２の目孔４０に糸通しされた
上糸２６を引張れば、該上糸２６は緊張して自然
に糸取りばね体３２に捕捉され、これにより一連
の糸掛けおよび糸通し作業が終了する。なお、こ
の糸掛け終了後の捕捉部６０ａは、第２図に示す
ように上糸２６の上方に非接触で位置するので、
ミシン縫製作業に際し上糸２６に干渉することは
ない。 Next, pass the thread through the eye hole 40 to the operating body 62.
When the pressing force is released, the operating body 62 returns to its original position under the elastic return action of the tension spring 94. Further, as a result of the release of the pressing force by the connecting member 64 to the motion transmission pin 90, the restoring elasticity of the torsion spring 80 and the tension spring 88 interposed between the rotary lever 76 and the guide shaft 70 causes the rotary lever 76 to
rotates counterclockwise to return to the initial state. Therefore, the threading slider 68 and the thread catching member 60 fixed thereto return by following the trajectory shown in FIG. It is in a slack state below 32. Therefore, when the operator pulls the upper thread 26 threaded through the eyelet 40 of the sewing needle 42 by the threading member 48, the upper thread 26 becomes tense and is naturally captured by the thread take-up spring body 32. A series of threading and threading operations are completed. Note that after this threading is completed, the catching portion 60a is located above the upper thread 26 without contacting it, as shown in FIG.
There is no interference with the needle thread 26 during sewing work.

発明の効果 以上説明した如く、本発明に係るミシンの自動
糸通し装置によれば、当該ミシンに具備した糸通
し装置を作動させる操作を行なうに際して、上糸
を捕捉した捕捉部を、糸掛けを必要とする糸調子
皿、天秤および糸取りばね体の近傍を通過させて
確実な糸掛けを行ない、従来繁雑な手操作を要し
ていた糸通し作業を極めて容易になし得る。Effects of the Invention As explained above, according to the automatic threading device for a sewing machine according to the present invention, when operating the threading device provided in the sewing machine, the catching portion that captures the upper thread can be used to thread the needle threader. The thread can be threaded reliably by passing near the necessary thread tension plate, thread take-up lever, and thread take-up spring body, and threading work, which conventionally required complicated manual operations, can be made extremely easy.

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

第１図は、本発明の好適実施例に係る自動糸通
し装置を備えたミシンにおいて、面板を取外した
状態で示すミシン頭部の正面図、第２図は面板を
取付けた状態で示すミシン頭部の一部縦断側面
図、第３図は第２図に示すミシン頭部の一部横断
平面図、第４図は本発明に係る糸掛け機構の概要
を示す分解斜視図、第５図は回動レバーおよび糸
捕捉部材の移動軌跡を示す説明図、第６図ａ〜第
６図ｄは、実施例に係る自動糸通し装置を備えた
ミシンを動作させた場合の回動レバーおよび糸捕
捉部材の経時的な動きを示す説明図、第７図は実
施例に係る装置の主要機構の組上がり状態を示す
斜視図である。 １０…ミシン機枠、２０…糸調子装置、２６…
上糸、２８…天秤、３２…糸取りばね、４０…目
孔、４２…縫針、４８…糸通し部材、５８…案内
体、５８ａ…案内面、６０…糸捕捉部材、６０ａ
…捕捉部、６２…操作体、６４…連結部材、７６
…回動レバー、７６ａ…自由端部、８０…弾性
体、８２…長溝。 FIG. 1 is a front view of the sewing machine head with the face plate removed, in a sewing machine equipped with an automatic threading device according to a preferred embodiment of the present invention, and FIG. 2 is a front view of the sewing machine head with the face plate attached. FIG. 3 is a partial cross-sectional plan view of the sewing machine head shown in FIG. 2, FIG. 4 is an exploded perspective view showing an overview of the threading mechanism according to the present invention, and FIG. FIGS. 6a to 6d, which are explanatory diagrams showing movement trajectories of the rotating lever and the thread catching member, show the rotating lever and the thread catching member when operating the sewing machine equipped with the automatic threading device according to the embodiment. FIG. 7 is an explanatory view showing the movement of members over time, and FIG. 7 is a perspective view showing an assembled state of the main mechanism of the device according to the embodiment. 10...Sewing machine frame, 20...Thread tension device, 26...
Upper thread, 28... Balance, 32... Thread take-up spring, 40... Eye hole, 42... Sewing needle, 48... Threading member, 58... Guide body, 58a... Guide surface, 60... Thread catching member, 60a
...Catching part, 62...Operation body, 64...Connecting member, 76
...Rotating lever, 76a...Free end, 80...Elastic body, 82...Long groove.

Claims (1)

【特許請求の範囲】 １ 上糸供給源から糸調子装置２０、糸取りばね
体３２および天秤２８を経て縫針４２の目孔４０
に向かう糸供給経路を介して供給された上糸２６
を、その目孔４０に通すために所定の糸通し運動
可能な糸通し部材４８を備えたミシンにおいて、 ミシン機枠１０上における前記糸調子装置２０
並びに糸取りばね体３２の配設位置および前記天
秤２８の所定の停止位置を夫々通る経路の形状に
対応した形状の案内面５８ａが形成され、かつ前
記ミシン機枠１０に固定された案内体５８と、 前記上糸供給源からの上糸を捕捉する捕捉部６
０ａが形成され、前記案内面５８ａに沿う糸掛け
運動可能な糸捕捉部材６０と、 ミシン機枠１０上で移動操作可能に装着された
１つの操作体６２と、 前記操作体６２の操作に従つて、前記糸掛け運
動並びに糸通し運動を前記糸捕捉部材６０および
糸通し部材４８に付与するために、操作体６２と
前記両部材６０，４８とを作動的に連結する連結
部材６４と を含むミシンの自動糸通し装置。 ２ 前記連結部材６４は、ミシン機枠１０に枢支
され前記操作体６２の操作力を受けて回動する回
動レバー７６を有し、その回動レバー７６の自由
端部７６ａには前記案内面５８ａと交差する方向
に延びる長溝８２が形成され、 前記糸捕捉部材６０は、前記案内面５８ａおよ
び長溝８２に共に係合して糸掛け運動を行なう ことを特徴とする特許請求の範囲第１項記載のミ
シンの自動糸通し装置。 ３ 前記糸捕捉部材６０の捕捉部６０ａが、前記
糸調子装置２０、糸取りばね体３２および天秤２
８の内の何れよりも前記上糸供給源に最も近い前
記糸供給経路中の位置の近傍であつて、かつ糸供
給経路から外れた所定位置に位置するように、前
記回動レバー７６を常時付勢する弾性体８０を更
に含む特許請求の範囲第２項記載のミシンの自動
糸通し装置。[Scope of Claims] 1. From the needle thread supply source to the eye hole 40 of the sewing needle 42 via the thread tension device 20, thread take-up spring body 32, and thread take-up lever 28.
The upper thread 26 is supplied via the thread supply path toward
The thread tension device 20 is mounted on the sewing machine frame 10 in a sewing machine equipped with a threading member 48 capable of performing a predetermined threading movement in order to pass the thread through the eyelet 40 of the sewing machine.
A guide surface 58a is formed in a shape corresponding to the shape of the path passing through the arrangement position of the thread take-up spring body 32 and a predetermined stopping position of the thread take-up lever 28, respectively, and the guide body 58 is fixed to the sewing machine frame 10. , a capturing section 6 that captures the needle thread from the needle thread supply source;
0a is formed and is capable of threading movement along the guide surface 58a; one operating body 62 mounted so as to be movable on the sewing machine frame 10; In order to apply the threading motion and threading motion to the thread catching member 60 and the threading member 48, the connecting member 64 operatively connects the operating body 62 and both the members 60 and 48. Automatic threading device for sewing machines. 2. The connecting member 64 has a rotating lever 76 that is pivotally supported on the sewing machine frame 10 and rotates in response to the operating force of the operating body 62, and the free end 76a of the rotating lever 76 has the guide A long groove 82 is formed extending in a direction intersecting the surface 58a, and the yarn catching member 60 engages with the guide surface 58a and the long groove 82 to perform a threading motion. The automatic threading device for the sewing machine described in Section 1. 3 The catching portion 60a of the thread catching member 60 is connected to the thread tension device 20, the thread take-up spring body 32, and the thread take-up lever 2.
The rotary lever 76 is always moved so that it is located at a predetermined position near the position in the thread supply path that is closest to the upper thread supply source than any of the above points 8 and 8 and outside the thread supply path. The automatic threading device for a sewing machine according to claim 2, further comprising an urging elastic body 80.