JP2709472B2 - sewing machine - Google Patents

sewing machine

Info

Publication number
JP2709472B2
JP2709472B2 JP63113035A JP11303588A JP2709472B2 JP 2709472 B2 JP2709472 B2 JP 2709472B2 JP 63113035 A JP63113035 A JP 63113035A JP 11303588 A JP11303588 A JP 11303588A JP 2709472 B2 JP2709472 B2 JP 2709472B2
Authority
JP
Japan
Prior art keywords
thread
shuttle
lower thread
movable blade
blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP63113035A
Other languages
Japanese (ja)
Other versions
JPH01284287A (en
Inventor
義夫 柴田
Original Assignee
株式会社バルダン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社バルダン filed Critical 株式会社バルダン
Priority to JP63113035A priority Critical patent/JP2709472B2/en
Publication of JPH01284287A publication Critical patent/JPH01284287A/en
Application granted granted Critical
Publication of JP2709472B2 publication Critical patent/JP2709472B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はミシンに関する。The present invention relates to a sewing machine.

〔従来の技術〕[Conventional technology]

実開昭58−181384号公報に示されているように、針板
の下方に下糸切断用の固定刃と可動刃を配設し、その可
動刃の下面に弾力的に当接して切断後の下糸の切れ端を
保持するようにした糸保持体を機枠に固着し、その糸保
持体の可動刃に対する弾力的な当接力を調圧子と調圧ネ
ジによって調節するようにした構成が知られている。
As shown in Japanese Utility Model Application Laid-Open No. 58-181384, a fixed blade and a movable blade for bobbin thread cutting are arranged below the needle plate, and after elastically contacting the lower surface of the movable blade, cutting is performed. A thread holding body adapted to hold a cut end of a lower thread is fixed to a machine frame, and the elastic contact force of the thread holding body against a movable blade is adjusted by a pressure adjuster and a pressure adjusting screw. Have been.

〔発明が解決しようとする課題〕[Problems to be solved by the invention]

この従来のミシンでは糸保持体の可動刃に対する当接
力を大きくして下糸の保持を確実にすると、縫製開始後
数針目ぐらいから、下糸において布に縫い付けられた部
分と糸保持体によって保持された部分との間が布の移動
によって引張状態になり、布の移動が阻害されて縫製模
様が崩れたり布にしわを生じる問題点があった。また上
記問題点を解決する為に糸保持体の可動刃に対する当接
力を弱くすると、縫製開始時において釜が回転して釜の
羽根が下糸を払いのけたときに、下糸が可動刃と糸保持
体との間から素抜け、下糸を上糸にからませることがで
きなくなって縫製の目飛びを発生する問題点があった。
本発明は以上のような点に鑑みてなされたもので、その
目的とするところは、縫製開始時には下糸を上糸に確実
にからませることができ、縫製開始によって布を移動さ
せるときには布を自由に移動させることができるように
したミシンを提供することである。
In this conventional sewing machine, when the abutment force of the thread holding body against the movable blade is increased to secure the lower thread, the sewing machine starts to sew the lower thread from the part sewn to the cloth and the thread holding body from around a few stitches after sewing starts. There is a problem in that the cloth is in a tension state due to the movement of the cloth due to the movement of the cloth, and the movement of the cloth is hindered, the sewing pattern collapses, and the cloth is wrinkled. Also, if the contact force of the thread holding body against the movable blade is weakened to solve the above problem, when the shuttle rotates at the start of sewing and the blade of the shuttle removes the lower thread, the lower thread comes into contact with the movable blade. There has been a problem that the lower thread cannot be entangled with the upper thread because the thread comes off from the thread holding body, resulting in stitch skipping.
The present invention has been made in view of the above points, and its purpose is to ensure that the lower thread can be entangled with the upper thread at the start of sewing, and the cloth is moved when the cloth is moved by the start of sewing. An object of the present invention is to provide a sewing machine that can be freely moved.

〔課題を解決するための手段〕[Means for solving the problem]

本願発明は、針板の下方には、下糸繰り出し用の釜を
回転自在に備え、針板の上方には、上糸繰り出し用の針
を上下動自在に備え、上記の針を上下動させると共に釜
を回転させることによって針板上に置かれる布を上糸と
下糸でもって縫製するようにしてあるミシンにおいて、
上記針板の下方における針板と釜との間の下糸通過軌跡
の側方に固定刃を配設し、その固定刃に対しては、固定
刃と協働して下糸を切断する為の可動刃を付設し、その
可動刃は固定刃のある切断位置から上記下糸通過軌跡を
越えての往復動を自在に構成してあり、さらに可動刃に
は復動時に上記下糸通過軌跡に位置している下糸を引っ
掛け、上記切断位置において固定刃との間で、布と釜と
の間にある下糸の中間を切断するように糸掛部を具備さ
せてあり、上記切断位置に位置させる可動刃の近くに
は、自由端を上記切断位置にある可動刃に圧接させて上
記切断された下糸の釜側の下糸自由端側を挟持し得るよ
うにした糸保持体を配設し、しかも、上記糸保持体に
は、可動刃と糸保持体との間で挟持する釜側の下糸に対
する圧接力を、上記釜の回転と連動して少なくとも1つ
以上の縫目が形成された後に減少させ上記下糸を抜け易
くするように緩め手段を付設したのである。
According to the present invention, a needle for lower thread feeding is rotatably provided below the needle plate, and a needle for upper needle feeding is provided above and below the needle plate so as to be vertically movable, and the needle is moved up and down. In a sewing machine, the cloth placed on the needle plate is sewn with the upper thread and the lower thread by rotating the shuttle together with
A fixed blade is disposed on the side of the lower thread passage locus between the needle plate and the shuttle below the needle plate, and the fixed blade is cooperated with the fixed blade to cut the lower thread. The movable blade is configured to freely reciprocate beyond the lower thread passage trajectory from the cutting position where the fixed blade is located. And a thread catching portion for cutting the middle of the lower thread between the cloth and the shuttle between the fixed blade at the cutting position and the cutting position. In the vicinity of the movable blade to be positioned at a position, a thread holding body having a free end pressed against the movable blade at the cutting position so as to be able to clamp the lower end free end side of the cut lower thread on the shuttle side. The thread holding body is provided with a pressing force against the lower thread on the hook side sandwiched between the movable blade and the thread holding body. In conjunction with the rotation is reduced after at least one or more stitches are formed at the annexed means loosened to easily removed the lower yarn.

〔作用〕[Action]

一箇所の縫製が終了した後に可動刃を往復移動させる
と、可動刃が下糸通過軌跡に位置する下糸を引っ掛けて
その下糸を固定刃との間で切断すると共に、その切断後
の釜に繋がる側の下糸の切れ端を可動刃と糸保持体との
間で確実に挟持する。次の縫製箇所において縫製を再び
開始するとき、釜の羽根が下糸を払いのけるが、下糸の
切れ端を可動刃と糸保持体との間に確実に挟持している
ので、下糸の素抜けは生じない。その結果、下糸と上糸
の確実なからみを達成できる。縫製の進行に伴なって布
を移動させるとき、糸保持体の可動刃に対する圧接力を
緩め手段によって減少させることによって、上記下糸の
挟持を解くことができる。その結果、布の移動を自由に
できる。
When the movable blade is reciprocated after the sewing of one place is completed, the movable blade hooks the lower thread located on the lower thread passage locus and cuts the lower thread between the fixed blade and the shuttle after the cutting. Is securely clamped between the movable blade and the thread holder. When sewing is started again at the next sewing position, the blade of the shuttle removes the bobbin thread, but since the cut end of the bobbin thread is securely clamped between the movable blade and the thread holder, the bobbin thread No omission occurs. As a result, reliable entanglement of the lower thread and the upper thread can be achieved. When the cloth is moved with the progress of sewing, the holding force of the thread holding body against the movable blade is reduced by the loosening means, whereby the holding of the lower thread can be released. As a result, the cloth can be moved freely.

〔実施例〕〔Example〕

以下本願の実施例を示す図面について説明する。第1
図乃至第3図において、1はミシンのベッドを示。2は
ベッド1に設けられた針板で、針落孔2aを有する。3は
針板2の下方に位置されている下糸繰り出し用の周知の
釜で、ベッド1によって回転自在に支承されている回転
時6に第3図に示すように止着されている。4は釜3に
おける羽根である。5は、ベッド1に樹立させたヘッド
(図示外)に備えさせた針棒に取付けた針を示し、針落
孔2aの通過を可能に上下動自在にしてある。
Hereinafter, drawings showing an embodiment of the present application will be described. First
In FIGS. 3 to 3, reference numeral 1 denotes a bed of the sewing machine. Reference numeral 2 denotes a needle plate provided on the bed 1 and has a needle drop hole 2a. Reference numeral 3 denotes a well-known shuttle for feeding a bobbin thread located below the needle plate 2, which is fastened as shown in FIG. Reference numeral 4 denotes a blade in the shuttle 3. Reference numeral 5 denotes a needle attached to a needle bar provided on a head (not shown) established on the bed 1, which is vertically movable so that it can pass through the needle drop hole 2a.

8はベッド1の下側に備えさせた下糸切り装置であっ
て、これにおいて9はベッド1に固着されている支持ブ
ラケットで、固定刃取付部9aと可動刃支承部9bを備えて
いる。10は固定刃取付部9aに取付ねじ11によって止着さ
れている固定刃で、第3図に示すように針板2の下方に
おける針板2と釜3との間の下糸通過軌跡Aの側方に配
設されている。上記固定刃10は下糸通過軌跡A側の下側
縁部に刃先12を備えている。13は固定刃10に対して移動
自在に付設されている可動刃で、元部は上記可動刃支承
部9bに回動自在に支承されている支軸14の上端部に止着
され、第2図に実線で示す切断位置と仮想線で示す引掛
回動位置とに往復動可能にしてある。上記可動刃13にお
いて、15は糸払い部で、切断位置側から引掛回動位置側
へいくほど回動中心からの距離が小さくなる円弧状に形
成され、可動刃13の回動によって上記下糸通過軌跡Aを
横切って移動する位置に設けてある。17は刃先で、可動
刃13に穿設した透孔16の上側の孔縁をもって構成してあ
る。該刃先17は、可動刃13の回動によって上記固定刃10
の刃先12の下側を摺接移動する位置に設けてある。18は
糸掛部で、可動刃13の回動によって下糸通過軌跡Aを横
切って移動する位置に設けてある。
Numeral 8 denotes a lower thread cutting device provided on the lower side of the bed 1, in which reference numeral 9 denotes a support bracket fixed to the bed 1, which has a fixed blade mounting portion 9a and a movable blade support portion 9b. Reference numeral 10 denotes a fixed blade fixed to the fixed blade mounting portion 9a by a mounting screw 11, and as shown in FIG. 3, the lower thread passing locus A between the needle plate 2 and the shuttle 3 below the needle plate 2 It is arranged on the side. The fixed blade 10 has a cutting edge 12 at a lower edge portion on the lower thread passage locus A side. Reference numeral 13 denotes a movable blade provided movably with respect to the fixed blade 10. The base portion is fixed to an upper end portion of a support shaft 14 rotatably supported by the movable blade support portion 9b. In the figure, reciprocation is possible between a cutting position indicated by a solid line and a hooking rotation position indicated by a virtual line. In the movable blade 13, a thread wiper 15 is formed in an arc shape in which the distance from the rotation center decreases as going from the cutting position to the hooking rotation position, and the lower thread is rotated by the rotation of the movable blade 13. It is provided at a position where it moves across the passage locus A. Reference numeral 17 denotes a cutting edge, which has a hole edge above a through hole 16 formed in the movable blade 13. The blade edge 17 is moved by the rotation of the movable blade 13,
Is provided at a position where the lower side of the cutting edge 12 slides and moves. Numeral 18 denotes a thread hooking portion, which is provided at a position where the movable blade 13 moves across the lower thread passage locus A by rotation.

次に、20は下糸切り装置8における可動刃作動装置で
あって、これにおいて、21は元部を上記支軸14の下端部
に止着してあるレバー、22はレバー21の先端部に回動自
在に取付けてある連結体で、貫通孔22aを設けてある。2
3は貫通孔22aに挿通されて止ねじ24によって連結体22に
止着してある作動杆で、図示しない駆動装置によって長
手方向へ所定量往復移動されるようにしてある。
Next, reference numeral 20 denotes a movable blade operating device in the lower thread cutting device 8, in which 21 is a lever having an original portion fixed to a lower end portion of the support shaft 14, and 22 is a distal end portion of the lever 21. The connecting body is rotatably mounted and has a through hole 22a. Two
Reference numeral 3 denotes an operating rod which is inserted into the through hole 22a and is fixed to the connecting member 22 by a set screw 24, and is reciprocated a predetermined amount in the longitudinal direction by a driving device (not shown).

次に、25は下糸保持装置である。これにおける糸保持
具26において、27は糸保持受で、上記切断位置における
可動刃13の先端部下面によって構成してある。28は糸保
持体で、元部はベッド1に回動自在に支承されている支
軸29の一端部に止着され、自由端は糸保持受27に圧接可
能に配設されている。上記糸保持体28はばね性を有する
金属板によって構成され、その先端部は斜め下向きに折
曲げられている。30は糸保持装置25における糸保持体作
動装置で、糸保持体28の自由端を糸保持受27に弾力的に
当接させる当接手段と、その自由端の糸保持受27に対す
る圧接力を減少(零にすることも含む)させる緩め手段
との両機能を果たすようにしてある。上生糸保持体作動
装置30において、31は支軸29の他端部に止着されている
揺動腕、32はプッシュソレノイドで、自体のソレノイド
本体32aはベッド1にブラケット33を介して止着され、
プランジャ32bは揺動腕31の先端部にピン連結されてい
る。34は支軸29に嵌合されて一端部がベッド1に他端部
が揺動腕31に夫々係止されている戻しばねで、プランジ
ャ32bを没入させる方向へ揺動腕31を付勢している。35
はベッド1に植設されている第1ストッパー、36はベッ
ド1に植設されている第2ストッパー、37は第3図に示
すように糸保持体28の自由端を受止める為の第3ストッ
パーで、上記支持ブラケット9の一部で構成されてい
る。
Next, 25 is a lower thread holding device. In the yarn holder 26 in this case, reference numeral 27 denotes a yarn holding receiver, which is constituted by the lower surface of the distal end portion of the movable blade 13 at the cutting position. Reference numeral 28 denotes a thread holding body, the base of which is fixed to one end of a support shaft 29 rotatably supported on the bed 1, and the free end of which is disposed so as to be able to press against the thread holding receiver 27. The thread holding member 28 is formed of a metal plate having a spring property, and its tip is bent obliquely downward. Reference numeral 30 denotes a thread holding body operating device in the thread holding device 25, which is a contact means for elastically contacting the free end of the thread holding body 28 with the thread holding receiver 27, and a pressing force of the free end against the thread holding receiver 27. It is designed to perform both functions as a loosening means for reducing (including zeroing). In the upper raw silk holder operating device 30, 31 is a swing arm fixed to the other end of the support shaft 29, 32 is a push solenoid, and its own solenoid body 32a is fixed to the bed 1 via a bracket 33. And
The plunger 32b is pin-connected to the tip of the swing arm 31. Numeral 34 denotes return springs fitted to the support shaft 29, one end of which is locked to the bed 1 and the other end of which is locked to the swing arm 31, and biases the swing arm 31 in a direction to retract the plunger 32b. ing. 35
Is a first stopper implanted in the bed 1, 36 is a second stopper implanted in the bed 1, and 37 is a third stopper for receiving the free end of the thread holder 28 as shown in FIG. The stopper is a part of the support bracket 9.

上記構成のものの動作を経時順に説明する。布Nに縫
製する場合には、針板2上に布Nを置いてミシンを作動
させる。この場合、針5が上下動すると共に釜3が同期
回転する。その過程においては、針5が上糸bを布Nの
下方に導く。その上糸bは釜3の周知の作用により、そ
れから繰り出される下糸aとからむ。その後、再び針5
が上糸bを布Nの上方に導く。この動作が順次繰り返さ
れ、第3図に示すように布Nに上糸bと下糸aが所定間
隔の縫目を形成する状態で縫製がなされる。
The operation of the above configuration will be described in chronological order. When sewing on the cloth N, the cloth N is placed on the needle plate 2 and the sewing machine is operated. In this case, the needle 5 moves up and down and the shuttle 3 rotates synchronously. In the process, the needle 5 guides the upper thread b below the cloth N. The upper thread “b” is entangled with the lower thread “a” fed out by the well-known action of the shuttle 3. After that, needle 5 again
Guides the upper thread b above the cloth N. This operation is sequentially repeated, and sewing is performed in a state where the upper thread b and the lower thread a form stitches at a predetermined interval on the cloth N as shown in FIG.

次に、上記縫製の終了後は、糸保持装置25の作動装置
30が作動し、次に下糸切り装置8によって下糸aを切断
する。即ち、先ず糸保持体作動装置30のプッシュソレノ
イド32に通電され、プランジャ32bが突出して揺動腕31
を第1ストッパー35に当接する位置迄揺動させ、それに
より糸保持体28が回動されてその自由端が可動刃13の糸
保持受27に弾力的に当接する。次に可動刃作動装置20の
作動杆23が長手方向へ往動してレバー21が第2図の実線
で示す位置から仮想線で示す位置迄揺動(往動)する。
上記レバー21の揺動によって、可動刃13が第3図に実線
で示す切断位置から仮想線で示す引掛回動位置迄揺動
(往動)する。その過程では可動刃13の糸払い部15が下
糸通過軌跡Aを横切ってその軌跡Aに位置する下糸aを
払いのけて移動する。その結果、可動刃13が引掛回動位
置に至ったときには、下糸aは可動刃13の糸掛部18側に
位置する状態となる。次に作動杆23が復動してレバー21
が復動する。この復動により可動刃13は元の切断位置に
揺動(復動)する。その過程では、可動刃13の糸掛部18
が下糸aを引っ掛けて固定刃10側へ導き、次に第5図に
示すように糸保持受27が糸保持体28に係合してその糸保
持体28を僅かに押下げ、糸保持体28の自由端が糸保持受
27に弾力的に強く圧接して両者間に上記下糸aの切れ端
a′を挟持する。次に可動刃13の刃先17と固定刃10の刃
先12との間で、上記布Nと、釜3との間にある下糸aの
中間が図示のように切断される。この切断状態において
は、布Nに連なる下糸は釜3に連なる下糸aに比べて短
くなる。なお切断後の釜3に繋がる側の先端における極
短寸法の下糸a′は第6図、第7図に示すように糸保持
体28と糸保持受27との間で確実に挟持されたままであ
る。なお、第6図において、下糸aの保持位置から端部
迄の長さLは約7〜8mmある場合を示している。
Next, after the completion of the sewing, the operating device of the thread holding device 25 is operated.
30 operates, and then the lower thread a is cut by the lower thread cutting device 8. That is, first, power is supplied to the push solenoid 32 of the thread holder operating device 30, and the plunger 32b projects to swing the arm 31.
Is pivoted to a position where it comes into contact with the first stopper 35, whereby the thread holding body 28 is rotated and its free end elastically contacts the thread holding receiver 27 of the movable blade 13. Next, the operating rod 23 of the movable blade operating device 20 moves forward in the longitudinal direction, and the lever 21 swings (forwards) from the position indicated by the solid line in FIG. 2 to the position indicated by the virtual line.
By the swing of the lever 21, the movable blade 13 swings (forwards) from the cutting position shown by the solid line in FIG. 3 to the hooking rotation position shown by the virtual line. In this process, the thread wiping unit 15 of the movable blade 13 moves across the lower thread passage locus A by sweeping the lower thread a located on the locus A. As a result, when the movable blade 13 reaches the hooking rotation position, the lower thread a is in a state of being located on the side of the thread hooking portion 18 of the movable blade 13. Next, the operating rod 23 moves back and the lever 21
Comes back. Due to this return movement, the movable blade 13 swings (returns) to the original cutting position. In the process, the thread hook 18 of the movable blade 13
Hooks the lower thread a and guides it to the fixed blade 10 side. Then, as shown in FIG. 5, the thread holder 27 engages with the thread holder 28 to slightly push down the thread holder 28 to hold the thread. The free end of the body 28
27, the cut end a 'of the lower thread a is sandwiched between them. Next, between the cutting edge 17 of the movable blade 13 and the cutting edge 12 of the fixed blade 10, an intermediate portion of the lower thread a between the cloth N and the shuttle 3 is cut as shown in the figure. In this cut state, the lower thread connected to the cloth N is shorter than the lower thread a connected to the shuttle 3. The extremely short bobbin thread a 'at the end connected to the shuttle 3 after the cutting is securely held between the thread holding body 28 and the thread holding receiver 27 as shown in FIGS. Up to. FIG. 6 shows a case where the length L from the holding position of the lower thread a to the end is about 7 to 8 mm.

上記下糸aの切断後は、針板2上の布Nを自由自在に
移動させて、次の縫製場所が針落位置にもたらされる。
After cutting the lower thread a, the cloth N on the needle plate 2 is freely moved to bring the next sewing place to the needle drop position.

次に、次の縫製場所にて再び縫製を開始する。この場
合、先ず第12図イのように針5が下降すると共に釜3が
回転し、その釜3の回転によって釜3の羽根4が上記釜
3と糸保持体28による保持部分との間に渡されている下
糸aを約5mm程度第8図、第9図に示すように払いのけ
るが、その下糸aの端a′は上記糸保持受27と糸保持体
28との間に確実に保持されているので素抜けることが防
止される。その状態で針5が布Nを貫通して上糸bを下
方へ導く(第12図ロ)。また釜3の回動により、導かれ
た上糸bと釜3の下糸aとを絡ます周知の作用が行なわ
れる。この場合、下糸aは短かくてもその端が下糸保持
装置25により保持されて素抜けが防止されているので、
確実にからみが達成される。その後、針5が上昇(第12
図ハ)して上糸bを第10図に示すように布Nの上方へ導
き、上糸bと下糸aによって布Nに対する第1針目の縫
い目cの形成が完了する。
Next, sewing is started again at the next sewing place. In this case, first, as shown in FIG. 12A, the needle 5 is lowered and the shuttle 3 is rotated, and the rotation of the shuttle 3 causes the blades 4 of the shuttle 3 to move between the shuttle 3 and the portion held by the thread holder 28. The transferred lower thread a is about 5 mm, as shown in FIGS. 8 and 9, and the end a 'of the lower thread a is connected to the thread holder 27 and the thread holder.
28, it is securely held between them, so that it can be prevented from coming off. In this state, the needle 5 penetrates the cloth N and guides the upper thread b downward (FIG. 12B). In addition, by the rotation of the shuttle 3, a well-known action of tangling the guided upper thread b and the lower thread a of the shuttle 3 is performed. In this case, even if the lower thread a is short, its end is held by the lower thread holding device 25 to prevent the thread from coming off.
Entanglement is reliably achieved. Thereafter, the needle 5 is raised (twelfth
Then, the upper thread b is guided above the cloth N as shown in FIG. 10, and the formation of the first stitch c on the cloth N is completed by the upper thread b and the lower thread a.

その後、針板2上の布Nが第10図において左方向へ所
定量(例えば0.7mm程度)移動され、針5が再び下降
(第12図ニ)されると共に釜3の回転が継続され、第11
図の如く、第2針目の縫い目が形成される(第12図
ホ)。
Thereafter, the cloth N on the needle plate 2 is moved a predetermined amount (for example, about 0.7 mm) to the left in FIG. 10, the needle 5 is lowered again (FIG. 12 d), and the rotation of the shuttle 3 is continued. Eleventh
As shown in the figure, the second stitch is formed (FIG. 12E).

次に第12図へに示すように針5の3回目の下降が行わ
れると、糸保持体作動装置30のプッシュソレノイド32へ
の通電が停止され、これにより揺動腕31が第2ストッパ
ー36に当接する位置迄戻しばね34の力によって揺動さ
れ、糸保持体28は第11図に示すように糸保持解放位置に
回動されてその自由端が糸保持受27から離れる(第12図
ト)と共に第3ストッパー37に当接して支持される。そ
の結果布Nに繋っている下糸aの切れ端a′は糸保持体
28と糸保持受27との間から抜けて保持が解放される。従
って、この後は、上記縫製の継続によって布Nが順次移
動されても、布Nへの最初の縫目に繋がっている下糸a
が引っ張られることがなくなり、布Nの移動が自由とな
って縫製模様の崩れや布Nへのしわの発生を防ぐことが
できる。なお、上記プッシュソレノイド32への通電の停
止は、第12図のチの期間内、又は、布Nに少なくとも1
つ以上の縫目が形成された後に行われるようにすれば良
い。
Next, when the needle 5 is lowered for the third time as shown in FIG. 12, the power supply to the push solenoid 32 of the thread holder operating device 30 is stopped, whereby the swing arm 31 is moved to the second stopper 36. The thread holding member 28 is swung by the force of the return spring 34 to a position where it comes into contact with the thread holding member 28, and is rotated to the thread holding release position as shown in FIG. 11, and its free end is separated from the thread holding receiver 27 (FIG. 12). (G) together with the third stopper 37 to be supported. As a result, the cut end a 'of the lower thread a connected to the cloth N is
The hook is released from the space between the thread holding support 28 and the thread holding receiver 27 to be released. Therefore, after this, even if the cloth N is sequentially moved by the continuation of the sewing, the lower thread a connected to the first seam to the cloth N
Can be prevented from being pulled, and the movement of the cloth N is free, so that it is possible to prevent collapse of the sewing pattern and generation of wrinkles on the cloth N. It should be noted that the power supply to the push solenoid 32 is stopped during the period of h in FIG.
It may be performed after one or more stitches are formed.

本願にあっては、糸保持体をその自由端が糸保持受に
強く当接するように糸保持体の弾力又は別設のばね等か
ら成る当接手段によって常時付勢しておき、所定時に緩
め手段によって上記付勢の力に抗する力を上記糸保持体
に作用させて、糸保持受に対する糸保持体の圧接力を減
少させるようにしても良い。
In the present application, the thread holding member is always urged by a contact means comprising an elastic force of the thread holding member or a separately provided spring so that the free end of the thread holding member strongly contacts the thread holding receiver, and is loosened at a predetermined time. By means, a force against the urging force may be applied to the yarn holding body to reduce the pressing force of the yarn holding body against the yarn holding receiver.

次に本願の異なる実施例を示す図面第13、14図につき
説明する。これらの図は緩め手段を前記下糸切り装置に
おける可動刃作動装置でもって構成した例を示すもの
で、該可動刃作動装置は可動刃13eを前記の範囲内のみ
ならず、第13図の切断位置から第14図の如く可動刃13e
が糸保持体28eから離れる下糸緩め位置まで移動させ得
るようにしてある。
Next, FIGS. 13 and 14 showing different embodiments of the present invention will be described. These figures show an example in which the loosening means is constituted by a movable blade operating device in the lower thread cutting device. The movable blade operating device not only moves the movable blade 13e within the above-mentioned range, but also cuts the movable blade 13e in FIG. Moveable blade 13e from the position as shown in Fig. 14
Can be moved to the lower thread loosening position away from the thread holder 28e.

このような構成にあっては、糸保持体28eによる下糸
の保持の緩めは、可動刃13eを第13図の位置から第14図
の如く移動させることによって行う。
In such a configuration, the holding of the lower thread by the thread holder 28e is loosened by moving the movable blade 13e from the position shown in FIG. 13 as shown in FIG.

なお、機能上前図のものと同一又は均等構成と考えら
れる部分には、前図と同一の符号にアルファベットのe
を付して重複する説明を省略した。
In addition, functionally considered to be the same or equivalent to those in the previous figure, the same reference numerals as those in the previous figure denote the same parts as in the previous figure.
And duplicated description is omitted.

〔発明の効果〕〔The invention's effect〕

以上のように本発明にあっては、布Nに対する縫製を
終了したとき、可動刃13を往復移動させることによって
布Nと釜3との間に繋がる下糸aを切断できると共に、
切断後の釜3に繋がる側の下糸aの切れ端a′を保持で
き、その結果布Nは自由に移動できるようになり、しか
も下糸の切れ端a′は釜3の外にあるので次の縫製を直
ちに開始できる効果がある。
As described above, according to the present invention, when sewing on the cloth N is completed, the lower thread a connected between the cloth N and the shuttle 3 can be cut by reciprocating the movable blade 13,
The cut end a 'of the lower thread a connected to the shuttle 3 after cutting can be held, and as a result, the cloth N can move freely, and the cut end a' of the lower thread is outside the shuttle 3 so that There is an effect that sewing can be started immediately.

さらに縫製を再び開始する場合、釜3に繋がる下糸の
切れ端a′を可動刃13と糸保持体28との間で確実に保持
しているので、釜3の最初の回転によって釜3の羽根4
が下糸aを払いのけてもその下糸aが可動刃13と糸保持
体28との間から素抜けるのを阻止でき、その結果第1針
目の上糸bを釜3に繋がる下糸aに確実にからませるこ
とができて最初から正確に縫製できる効果がある。
Further, when sewing is started again, since the cut end a 'of the lower thread connected to the shuttle 3 is securely held between the movable blade 13 and the thread holder 28, the first rotation of the shuttle 3 causes the blades of the shuttle 3 to rotate. 4
Can prevent the lower thread a from coming off from between the movable blade 13 and the thread holder 28 even if the lower thread a is dislodged. As a result, the lower thread connecting the upper thread b of the first stitch to the shuttle 3 can be prevented. There is an effect that the sewing machine can be securely entangled with a and can be accurately sewn from the beginning.

また縫製の開始によって針5の上下動数に対応させて
布Nを移動させる場合、糸保持体28の可動刃13に対する
圧接力を緩め手段30によって減少させることによって、
布への最初の縫目cに繋がっている下糸aの切れ端a′
を可動刃13と糸保持体28との間から弱い力で抜き出すこ
とができ、その結果布Nの移動を自由にできて縫製模様
を正確にできると共に布Nのしわ発生を防止できる効果
がある。
When the cloth N is moved in accordance with the number of vertical movements of the needle 5 at the start of sewing, the pressing force of the thread holder 28 against the movable blade 13 is reduced by the loosening means 30,
A piece a 'of the lower thread a connected to the first seam c to the cloth
Can be extracted from the space between the movable blade 13 and the thread holder 28 with a weak force. As a result, the cloth N can be freely moved, the sewing pattern can be made accurate, and the cloth N can be prevented from wrinkling. .

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

図面は本願の実施例を示すもので、第1図は一部を破断
して示す斜視図、第2図は一部を省略して示す平面図、
第3図は縦断面図、第4図は第3図の針板と布を省略し
て示す平面図、第5図は下糸を切断する直前の状態を示
す断面図、第6図は下糸の切断を終了した状態を示す断
面図、第7図は第6図の針板と布を省略して示す平面
図、第8図は縫製を再び開始した直後の状態を示す断面
図、第9図は第8図の針板と布を省略して示す平面図、
第10図は第1針目を終了した状態を示す断面図、第11図
は第2針目を終了した状態を示す断面図、第12図は天
秤、針、釜、糸保持体及び布移動の作動を示すタイムチ
ャート図、第13図は緩め手段の異なる例を説明するため
の部分断面図、第14図は緩め手段により下糸の保持を緩
めた状態を示す部分断面図。 2……針板、3……釜、5……針、N……布、A……下
糸通過軌跡、10……固定刃、13……可動刃、18……糸掛
部、28……糸保持体、30……糸保持体作動装置(緩め手
段)。
BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present application, FIG. 1 is a perspective view showing a partly broken part, FIG. 2 is a plan view showing a partly omitted part,
FIG. 3 is a longitudinal sectional view, FIG. 4 is a plan view showing the needle plate and the cloth of FIG. 3 omitted, FIG. 5 is a sectional view showing a state immediately before cutting the lower thread, and FIG. FIG. 7 is a cross-sectional view showing a state in which cutting of the thread has been completed, FIG. 7 is a plan view showing the needle plate and cloth of FIG. 6 omitted, FIG. 8 is a cross-sectional view showing a state immediately after sewing is restarted, 9 is a plan view showing the needle plate and the cloth of FIG. 8 omitted,
FIG. 10 is a cross-sectional view showing a state where the first stitch has been completed, FIG. 11 is a cross-sectional view showing a state where the second stitch has been completed, and FIG. 12 is an operation of a balance, a needle, a shuttle, a thread holder, and a cloth movement. FIG. 13 is a partial cross-sectional view for explaining different examples of the loosening means, and FIG. 14 is a partial cross-sectional view showing a state where the holding of the lower thread is loosened by the loosening means. 2 ... needle plate, 3 ... hook, 5 ... needle, N ... cloth, A ... lower thread passage locus, 10 ... fixed blade, 13 ... movable blade, 18 ... thread hooking part, 28 ... ... Thread holding body, 30 ... Thread holding body actuator (loosening means).

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】針板の下方には、下糸繰り出し用の釜を回
転自在に備え、針板の上方には、上糸繰り出し用の針を
上下動自在に備え、上記の針を上下動させると共に釜を
回転させることによって針板上に置かれる布を上糸と下
糸でもって縫製するようにしてあるミシンにおいて、上
記針板の下方における針板と釜との間の下糸通過軌跡の
側方に固定刃を配設し、その固定刃に対しては、固定刃
と協働して下糸を切断する為の可動刃を付設し、その可
動刃は固定刃のある切断位置から上記下糸通過軌跡を越
えての往復動を自在に構成してあり、さらに可動刃には
復動時に上記下糸通過軌跡に位置している下糸を引っ掛
け、上記切断位置において固定刃との間で、布と釜との
間にある下糸の中間を切断するように糸掛部を具備させ
てあり、上記切断位置に位置させる可動刃の近くには、
自由端を上記切断位置にある可動刃に圧接させて上記切
断された下糸の釜側の下糸自由端側を挟持し得るように
した糸保持体を配設し、しかも、上記糸保持体には、可
動刃と糸保持体との間で挟持する釜側の下糸に対する圧
接力を、上記釜の回転と連動して少なくとも1つ以上の
縫目が形成された後に減少させ上記下糸を抜け易くする
ように緩め手段を付設してあるミシン。
1. A shuttle for lower thread feeding is rotatably provided below the needle plate, a needle for upper thread feeding is provided above and below the needle plate so as to be vertically movable, and the needle is vertically moved. In a sewing machine in which the cloth placed on the needle plate is sewn with the upper thread and the lower thread by rotating the shuttle and rotating the shuttle, the lower thread passage locus between the needle plate and the shuttle below the needle plate The fixed blade is arranged on the side of the fixed blade, and the fixed blade is provided with a movable blade for cutting the bobbin thread in cooperation with the fixed blade. The reciprocating motion beyond the lower thread passage locus is freely configured, and further, the lower thread positioned on the lower thread passage locus is hooked on the movable blade at the time of reversing, and the lower blade is moved with the fixed blade at the cutting position. Between the cloth and the shuttle, a thread hook is provided so as to cut the middle of the lower thread. Near the movable blade to be positioned in location,
A thread holding member having a free end pressed against a movable blade at the cutting position so as to be able to clamp the lower end free end side of the cut lower thread on the shuttle side; Reducing the pressing force on the shuttle-side lower thread sandwiched between the movable blade and the thread holder after at least one or more stitches have been formed in conjunction with the rotation of the shuttle. A sewing machine provided with loosening means to make it easier to pull out.
JP63113035A 1988-05-10 1988-05-10 sewing machine Expired - Fee Related JP2709472B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63113035A JP2709472B2 (en) 1988-05-10 1988-05-10 sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63113035A JP2709472B2 (en) 1988-05-10 1988-05-10 sewing machine

Publications (2)

Publication Number Publication Date
JPH01284287A JPH01284287A (en) 1989-11-15
JP2709472B2 true JP2709472B2 (en) 1998-02-04

Family

ID=14601827

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63113035A Expired - Fee Related JP2709472B2 (en) 1988-05-10 1988-05-10 sewing machine

Country Status (1)

Country Link
JP (1) JP2709472B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0747102Y2 (en) * 1990-10-12 1995-11-01 ジューキ株式会社 Sewing machine thread trimmer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53131843U (en) * 1977-03-25 1978-10-19

Also Published As

Publication number Publication date
JPH01284287A (en) 1989-11-15

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