JP3990491B2

JP3990491B2 - Sewing thread tensioner

Info

Publication number: JP3990491B2
Application number: JP09429998A
Authority: JP
Inventors: 松下俊樹
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 1998-04-07
Filing date: 1998-04-07
Publication date: 2007-10-10
Anticipated expiration: 2018-04-07
Also published as: JPH11290567A

Description

【０００１】
【発明の属する技術分野】
本発明は、ミシンの糸調子器に関するものである。
【０００２】
【従来の技術】
この種従来のミシンの糸調子器について、図３、図４により説明する。。
１はミシンのフレーム、２はフレーム１に固定し三つの糸孔を形成した糸案内台、３は糸調子器であり、この糸調子器は次のように構成されている。
４はフレーム１に支持された糸調子器軸で、この糸調子器軸４には、常には左方への弾性力を受ける糸緩め手段の一部を構成する糸緩め軸５が遊嵌されるとともに、右方に糸調子器軸４の直径より少し細いねじ部６と、軸芯に軸線方向の溝７が形成されている。
【０００３】
８、９は、それぞれの糸の挟持面が互いに対向する糸調子皿である。
１０は皿状の糸調子皿の押さえ板で、ねじ部６外周と中央の押圧部１１が溝７とに遊嵌されている。
１２は、左端に底部をもつ円筒状の糸調子皿の皿押さえで、底部をねじ部６に遊嵌し、左端面が押さえ板１０の端面に接触し、円筒状の外周部に溝１３とその溝に沿ってメモリ１４が形成されている。
【０００４】
１５は調節つまみで、糸調子器軸４のねじ部６にねじ込まれているとともに、皿押さえ１２の内側に遊嵌されている。
１６は弾性体としての円錐ばねで、皿押さえ１２の底部と調節つまみ１５の左端面との間に配置されている。
１７は糸取りばねで、基部を糸調子器軸４に遊嵌して図示しないがその一端をフレーム１に固定し、他端をフレーム１の外方の糸調子皿８、９外周部に延出し、その端をＵ字状に折曲して糸掛け部１８を形成する。
【０００５】
１９は糸取りばね１７の運動位置を調節する調節板で、長孔２０を介してねじ２１によりフレーム１に固定されている。
図３において、２２は糸調子器糸案内、２３は天秤、２４は天秤糸案内、２５は針棒糸案内、２６は針棒、２７は針留め糸案内、２８は針、２９は上糸である。
【０００６】
次にこの従来技術の作用を説明する。
図４のａは、ミシンにより布を縫合している状態であり、弾性体としての円錐ばね１６の作用力を皿押さえ１２と押さえ板１０とを介して糸調子皿８、９に付与し、それら糸調子皿８、９の対向する挟持面を圧接させた状態で、この糸調子皿８、９の対向する挟持面の間に上糸を挟持して上糸に張力を付与している。
【０００７】
この糸調子皿８、９の対向する挟持面に上糸を通すには次のようにする。
まず図４のａの状態から、不図示の布押さえを上昇させると、糸緩め手段の一部を構成する糸緩め軸５が右方へ押され、押さえ板１０の押圧部１１を右方に移動する。これにより押さえ板１０は、皿押さえ１２全体を円錐ばね１６に抗して右方に移動し、糸調子皿８、９に対する円錐ばね１６の作用力が解除される。（図４ｂ）
【０００８】
この状態から、図３に示すように上糸２９をまず、糸案内台２の糸孔に図３のように通したのち、糸調子器３の右側から下方に上糸２９を回して上糸２９が二枚の糸調子皿８、９の挟持面の間に入るようにして、上方に引き上げる。次いで糸取りばね１７のＵ字状の糸掛け部１８に掛け、糸調子器糸案内２２から上方に折り返し、天秤糸案内２４を介して天秤２３の糸孔に通し、さらに下に折り返し再び天秤糸案内２４を介して針棒糸案内２５にかけわたした後、針留め糸案内２７に通し、最後に針２８の糸孔に上糸２９を通す。
【０００９】
【発明が解決しようとする課題】
しかしながら、この従来の技術においては、次のような問題がある。
即ち、上記の糸通し時において、糸調子器３に糸通しするときに、その糸調子皿８、９の挟持面は図４のｂのように、円錐ばね１６の作用力が解除され、自由状態となっているとともに、フレーム１と糸調子皿８との間Ａや糸調子皿９と押さえ板１０との間Ｂ等に隙間があり、その上に糸を通す作業者の目が糸調子器３の正面にあるのでそれらの隙間が見えない為に、正確に糸調子皿８、９の挟持面に上糸２９を通せずに、前述したフレーム１と糸調子皿８との間Ａや糸調子皿９と押さえ板１０との間Ｂ等の隙間に上糸２９を通してしまうことがしばしば起こる。
【００１０】
これらの隙間に上糸２９を通した状態で糸緩め手段により円錐ばね１６の作用力を糸調子皿８、９の挟持面に付与し、ミシンを駆動して布を縫製すると、上糸２９に適正な張力が与えられないために、下糸との張力バランスが崩れ縫い目が適正に形成されず、縫い製品の商品価値が低下する問題があった。
また、上記のような場合、上糸をもう一度糸調子器から引き抜いて、再び糸調子器に上糸２９を通し直さなければならず、作業能率が低下する等の問題があった。
【００１１】
【課題を解決するための手段】
上記問題を解決するために、請求項１記載の発明は、
それぞれの挟持面が互いに対向する二枚の糸調子皿と、それら糸調子皿を圧接させる弾性体と、弾性体による糸調子皿への作用力を付与したり解除したりする糸緩め手段とを備えたミシンの糸調子器において、上記二枚の糸調子皿の挟持面とは反対側に上記糸調子皿と対抗してそれぞれ案内部材を備え、弾性体による糸調子皿への作用力を付与した時の前記案内部材と糸調子皿との間に前記二枚の糸調子皿の傾きの自由度が保証される隙間S1、S2があり、糸緩め手段により糸調子皿への作用力を解除した時の上記二枚の糸調子皿の糸掛け側に、それぞれの糸調子皿の挟持面とは反対側に配置した前記案内部材から糸調子皿の外周を越えて挟持面に向け傾斜して延出し、糸を糸調子皿の挟持面に案内する糸案内片を設けた構成とした。
【００１２】
この請求項１記載の発明によれば、糸緩め手段により糸調子皿への作用力を解除した時の糸調子器の糸掛け側に上糸２９を回し、そのまま引き上げると、上糸２９はそれぞれ糸案内片により、二枚の糸調子皿の挟持面に自動的に案内され、上糸２９を確実に糸調子皿の挟持面に通すことができるから、下糸との張力バランスが適正に保たれ、常に安定した縫い目が形成出来て縫い製品の商品価値が向上するとともに、糸通し操作が容易となって作業能率が向上する等の効果がある。
【００１３】
【発明の実施の形態】
以下、この発明の実施の形態について、図面を参照しながら説明する。
この発明の糸調子器の基本的な構成は、殆ど従来の構成と同一なので、同一の構成部品には従来と同じ部品番号を付して詳細な説明は省略し、本発明の特徴的な構成を中心に説明する。
【００１４】
図１の１９は糸取りばね１７の運動位置を調節する調節板（第１案内部材）で、その約２／３の外周部分、換言すると、糸調子器３の右方から下方及び左下（図３における）の糸掛け側の部分に、皿押さえ１２側へと折曲される折曲部３０を形成するとともに、その折曲部３０先端に糸調子皿８の外周を越えて先端が二枚の糸調子皿８、９の挟持面に向けて傾斜して延出する複数（本実施例では３つ）の糸案内片３１を設ける。この糸案内片３１は糸調子皿８の外周に掛合している。
【００１５】
また、皿押さえ（第２案内部材）１２にはその左端外周にも、図３の糸調子器３の右方から下方及び左下の糸掛け側の部分に、糸調子皿９の外周を越えて先端が二枚の糸調子皿８、９の挟持面に向けて傾斜して延出する複数（本実施例では３つ、内１つは図示なし）の糸案内片３２を設ける。この糸案内片３２は糸調子皿９の外周に掛合している。なお、前記第１案内部材と第２案内部材により案内部材が構成される。
【００１６】
このように構成した糸調子器３を組み立ててミシンのフレーム１に取り付けると、図２の状態となる。
この発明において、図２のａに示す、弾性体としての円錐ばね１６による糸調子皿８、９への作用力を付与した状態においては、調節板１９の折曲部３０の内周部と糸調子皿８の外周部左端との間に隙間Ｓ１があり、また、皿押さえ１２の糸案内片３２の内周部と糸調子皿９の外周部右端との間にも隙間Ｓ２があり、これらの隙間Ｓ１，Ｓ２は糸調子皿８、９の傾きの自由度を保証し、挟持面の密着度を高め、上糸２９へ常に均一な張力を与える。
【００１７】
この発明の糸調子器３に、上糸２９を糸通しするには、不図示の布押さえを上昇させると、図２のａの状態から糸緩め手段としての糸緩め軸５が右方に押され、これにより押さえ板１０の押圧部１１を右方に移動する。これにより押さえ板１０は、皿押さえ１２全体を円錐ばね１６に抗して右方に移動し、この皿押さえ１２の移動により糸案内片３２が糸調子皿９の外周を越えて先端が二枚の糸調子皿８、９の挟持面に向けて傾斜して延出し、糸調子皿９の外周に掛合しているので、糸調子皿９は皿押さえ１２とともに図２のように右方に移動して、糸調子皿８、９に対する円錐ばね１６の作用力が解除される。
【００１８】
この時、糸案内片３１が糸調子皿８の外周に掛合しているとともに、糸案内片３２が糸調子皿９の外周に掛合しているため、糸調子皿８と糸調子皿９とが確実に離間する。
この状態から、図３に示すように上糸２９をまず、糸案内台２６の糸孔に図３のように通したのち、糸調子器３の右側から下方に上糸２９を回して上糸２９が二枚の糸調子皿８、９の挟持面の間に入るようにして、上方に引き上げる。
【００１９】
この時、本発明においては、糸調子器３の右方から下方及び左下の糸掛け側の部分に、それぞれ糸案内片３１、３２が、糸調子皿８、９の外周を越え、挟持面に向け傾斜して形成されているので、上糸２９はこれらの糸案内片３１、３２に案内されて、自動的に挟持面に上糸２９を通すことが出来る。
次いで糸取りばね１７のＵ字状の糸掛け部１８に掛け、糸調子器糸案内２２から上方に折り返し、天秤糸案内２４を介して天秤２３の糸孔に通し、さらに下に折り返し再び天秤糸案内２４を介して針棒糸案内２５にかけわたした後、針留め糸案内２７に通し、最後に針２８の糸孔に上糸２９を通す。
【００２０】
【発明の効果】
以上のように、この発明は、糸調子器の右方から下方及び左下の糸掛け側の部分に、それぞれ糸案内片が、糸調子皿の外周を越え、挟持面に向け傾斜して形成されているので、上糸はこれらの糸案内片に案内されて、自動的に挟持面に上糸を通すことが出来るので、上糸の糸調子器への誤挿入により生ずる縫い目不良が防止でき、縫い製品の商品価値を向上することができるとともに、誤挿入にともなう糸の通し直しに要する時間が不要となるから、作業能率が向上する等の効果が得られる。また、弾性体による糸調子皿への作用力を付与した時の前記案内部材と糸調子皿との間に前記二枚の糸調子皿の傾きの自由度が保証される隙間S1、S2をもうけたので、これらの隙間Ｓ１，Ｓ２は糸調子皿８、９の傾きの自由度を保証し、挟持面の密着度を高め、上糸２９へ常に均一な張力を与える効果を奏する。
【図面の簡単な説明】
【図１】本発明の実施の形態である、糸調子器の部分斜視図。
【図２】ａ本発明の実施の形態である、糸調子器の糸調子皿に弾性力を付与した状態の断面図。
ｂ本発明の実施の形態である、糸調子器の糸調子皿に作用する弾性力を解除した状態の断面図。
【図３】ミシンの糸調子器への上糸の糸通し順序を説明するための説明図。
【図４】ａ従来の糸調子器の、糸調子器の糸調子皿に弾性力を付与した状態の断面図。
ｂ従来の糸調子器の、糸調子器の糸調子皿に作用する弾性力を解除した状態の断面図。
【符号の説明】
３糸調子器
４糸調子器軸
５糸緩め軸（糸緩め手段）
８、９糸調子皿
１０押さえ板
１２皿押さえ（第１案内部材）
１５調節つまみ
１６円錐ばね（弾性体）
１７糸取りばね
１８糸掛け部
１９調節板（第２案内部材）
２３天秤
３０折曲部
３１、３２糸案内片[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thread tension device for a sewing machine.
[0002]
[Prior art]
A thread tension device of this type of conventional sewing machine will be described with reference to FIGS. .
Reference numeral 1 denotes a sewing machine frame, 2 a yarn guide base fixed to the frame 1 to form three yarn holes, and 3 a yarn tensioner, which is constructed as follows.
Reference numeral 4 denotes a thread tensioner shaft supported by the frame 1, and a thread loosening shaft 5 that constitutes a part of the thread loosening means that always receives the elastic force to the left is loosely fitted on the thread tensioner shaft 4. In addition, a screw portion 6 slightly thinner than the diameter of the thread tensioner shaft 4 is formed on the right side, and an axial groove 7 is formed on the shaft core.
[0003]
8 and 9 are thread tension plates in which the holding surfaces of the respective threads face each other.
Reference numeral 10 denotes a press plate for a dish-shaped thread tension plate, and an outer periphery of the screw portion 6 and a central pressing portion 11 are loosely fitted in the groove 7.
12 is a plate presser of a cylindrical thread tension tray having a bottom portion at the left end, the bottom portion is loosely fitted to the screw portion 6, the left end surface is in contact with the end surface of the press plate 10, and the groove 13 is formed on the cylindrical outer peripheral portion. A memory 14 is formed along the groove.
[0004]
Reference numeral 15 denotes an adjustment knob which is screwed into the threaded portion 6 of the thread tensioner shaft 4 and is loosely fitted inside the counter presser 12.
Reference numeral 16 denotes a conical spring as an elastic body, which is disposed between the bottom of the pan presser 12 and the left end surface of the adjustment knob 15.
A thread take-up spring 17 is loosely fitted to the thread tensioner shaft 4 and has one end fixed to the frame 1 and the other end extended to the outer periphery of the thread tension plates 8 and 9 outside the frame 1. The end is bent in a U-shape to form the yarn hooking portion 18.
[0005]
Reference numeral 19 denotes an adjustment plate that adjusts the movement position of the thread take-up spring 17, and is fixed to the frame 1 by screws 21 through a long hole 20.
In FIG. 3, 22 is a thread tensioner thread guide, 23 is a balance, 24 is a balance thread guide, 25 is a needle bar thread guide, 26 is a needle bar, 27 is a needle clamp thread guide, 28 is a needle, 29 is an upper thread is there.
[0006]
Next, the operation of this prior art will be described.
4a shows a state in which the cloth is stitched by the sewing machine, and the acting force of the conical spring 16 as an elastic body is applied to the thread tension plates 8 and 9 via the plate presser 12 and the presser plate 10, In a state where the opposing clamping surfaces of the thread tension plates 8 and 9 are in pressure contact with each other, the upper yarn is clamped between the opposing clamping surfaces of the thread tension plates 8 and 9 to apply tension to the upper yarn.
[0007]
The upper thread is passed through the opposing clamping surfaces of the thread tension plates 8 and 9 as follows.
First, when the cloth presser (not shown) is raised from the state shown in FIG. 4a, the thread loosening shaft 5 constituting a part of the thread loosening means is pushed rightward, and the pressing portion 11 of the pressure plate 10 is moved rightward. Moving. As a result, the press plate 10 moves to the right against the conical spring 16 over the entire plate presser 12, and the acting force of the conical spring 16 on the thread tension plates 8 and 9 is released. (Fig. 4b)
[0008]
From this state, as shown in FIG. 3, the upper thread 29 is first passed through the thread hole of the thread guide base 2 as shown in FIG. 3, and then the upper thread 29 is turned downward from the right side of the thread tensioner 3. Pull 29 upward so that 29 enters between the clamping surfaces of the two thread tension plates 8 and 9. Next, it is hung on a U-shaped thread hook portion 18 of the thread take-up spring 17, folded back upward from the thread tensioner thread guide 22, passed through the thread hole of the balance 23 via the balance thread guide 24, and further folded back to the balance thread guide again. After passing through the needle bar thread guide 25 through 24, the needle thread guide 27 is passed through, and finally the upper thread 29 is passed through the thread hole of the needle 28.
[0009]
[Problems to be solved by the invention]
However, this conventional technique has the following problems.
That is, during threading, when the thread tensioner 3 is threaded, the clamping surface of the thread tension plates 8 and 9 is released from the acting force of the conical spring 16 as shown in FIG. In addition, there is a gap between the frame 1 and the thread tension plate 8 and between the thread tension plate 9 and the holding plate 10, and the eyes of the operator who passes the thread are thread tension. Since the gap between them is not visible because it is in front of the container 3, the upper thread 29 is not passed through the clamping surface of the thread tension plates 8, 9, and between the frame 1 and the thread tension plate 8, A and It often happens that the upper thread 29 is passed through a gap such as B between the thread tension plate 9 and the holding plate 10.
[0010]
When the upper thread 29 is passed through these gaps, the thread loosening means applies the acting force of the conical spring 16 to the clamping surface of the thread tension plates 8 and 9, and the sewing machine is driven to sew the cloth. Since the proper tension cannot be applied, the tension balance with the lower thread is lost, and the seam is not properly formed, resulting in a problem that the commercial value of the sewn product is lowered.
In the above case, the upper thread has to be pulled out from the thread tensioner again, and the upper thread 29 has to be passed through the thread tensioner again, resulting in a problem that work efficiency is lowered.
[0011]
[Means for Solving the Problems]
In order to solve the above problem, the invention of claim 1
Two thread tension plates with their respective clamping surfaces facing each other, an elastic body that presses the thread tension plates, and a thread loosening means that applies or releases the acting force on the thread tension plate by the elastic body In the thread tension device of the sewing machine, the guide member is provided on the opposite side to the holding surface of the two thread tension plates, respectively, and a guide member is provided to impart an acting force to the thread tension plate by the elastic body. There are gaps S1 and S2 between the guide member and the thread tension plate that guarantee the degree of freedom of tilting of the two thread tension plates, and the force acting on the thread tension plate is released by the thread loosening means. When the two thread tension plates are inclined, the guide member arranged on the opposite side of the holding surface of the respective thread tension plates is inclined toward the clamping surface beyond the outer periphery of the thread tension plate. The yarn guide piece is provided to extend and guide the yarn to the holding surface of the thread tension plate.
[0012]
According to the first aspect of the present invention, when the upper thread 29 is turned to the thread hooking side of the thread tensioner when the acting force to the thread tension plate is released by the thread loosening means and pulled up as it is, the upper thread 29 is respectively The thread guide piece automatically guides to the clamping surface of the two thread tension plates, and the upper thread 29 can be surely passed through the clamping surface of the thread tension plate, so that the tension balance with the lower thread is maintained properly. As a result, a stable seam can be formed all the time, and the commercial value of the sewn product is improved, and the threading operation is facilitated and the work efficiency is improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Since the basic configuration of the thread tensioner of the present invention is almost the same as the conventional configuration, the same components are denoted by the same component numbers as those of the conventional configuration, and detailed description thereof is omitted, and the characteristic configuration of the present invention is omitted. The explanation will be focused on.
[0014]
Reference numeral 19 in FIG. 1 denotes an adjustment plate (first guide member) that adjusts the movement position of the thread take-up spring 17, which is about 2/3 of the outer peripheral portion, in other words, from the right side of the thread tensioner 3 to the lower side and the lower left side (FIG. The bent portion 30 that is bent toward the plate presser 12 side is formed in the portion on the yarn hooking side of (2), and the tip of the bent portion 30 has two tips beyond the outer periphery of the thread tension tray 8. A plurality (three in the present embodiment) of thread guide pieces 31 that are inclined and extend toward the clamping surfaces of the thread tension plates 8 and 9 are provided. The thread guide piece 31 is engaged with the outer periphery of the thread tension tray 8.
[0015]
Further, the counter presser (second guide member) 12 has an outer periphery on the left end thereof, and extends beyond the outer periphery of the thread tension tray 9 from the right side of the thread tensioner 3 in FIG. A plurality of (three in the present embodiment, one of which is not shown) thread guide pieces 32 are provided that extend incline toward the clamping surface of the two thread tension plates 8 and 9. The thread guide piece 32 is engaged with the outer periphery of the thread tension tray 9. The first guide member and the second guide member constitute a guide member.
[0016]
When the thread tensioner 3 configured as described above is assembled and attached to the sewing machine frame 1, the state shown in FIG. 2 is obtained.
In the present invention, in the state where the acting force is applied to the thread tension plates 8 and 9 by the conical spring 16 as an elastic body shown in FIG. There is a gap S1 between the outer peripheral portion left end of the tension plate 8, and there is also a gap S2 between the inner peripheral portion of the thread guide piece 32 of the plate presser 12 and the outer peripheral portion right end of the thread tension plate 9. The gaps S1 and S2 guarantee the degree of freedom of the inclination of the thread tension plates 8 and 9, increase the tightness of the clamping surface, and always apply a uniform tension to the upper thread 29.
[0017]
In order to thread the upper thread 29 through the thread tensioner 3 of the present invention, when a cloth presser (not shown) is raised, the thread loosening shaft 5 as the thread loosening means is pushed rightward from the state of FIG. Thus, the pressing portion 11 of the pressing plate 10 is moved to the right. As a result, the presser plate 10 moves to the right against the conical spring 16 through the entire plate presser 12, and the movement of the plate presser 12 causes the thread guide piece 32 to exceed the outer periphery of the thread tension plate 9 and has two tips. Since the thread tension trays 8 and 9 are inclined and extended toward the holding surface of the thread tension trays 8 and are engaged with the outer periphery of the thread tension tray 9, the thread tension tray 9 moves to the right as shown in FIG. Then, the acting force of the conical spring 16 on the thread tension plates 8 and 9 is released.
[0018]
At this time, since the thread guide piece 31 is engaged with the outer periphery of the thread tension tray 8 and the thread guide piece 32 is engaged with the outer periphery of the thread tension tray 9, the thread tension tray 8 and the thread tension tray 9 are Ensure separation.
From this state, as shown in FIG. 3, the upper thread 29 is first passed through the thread hole of the thread guide base 26 as shown in FIG. 3, and then the upper thread 29 is turned downward from the right side of the thread tensioner 3. Pull 29 upward so that 29 enters between the clamping surfaces of the two thread tension plates 8 and 9.
[0019]
At this time, in the present invention, the thread guide pieces 31 and 32 extend from the right side of the thread tensioner 3 to the lower part and the lower left part of the thread hooking side, respectively, beyond the outer periphery of the thread tension trays 8 and 9 and on the clamping surface. Since the upper thread 29 is formed so as to be inclined, the upper thread 29 can be guided by these thread guide pieces 31 and 32 and automatically passed through the clamping surface.
Next, it is hung on a U-shaped thread hook portion 18 of the thread take-up spring 17, folded back upward from the thread tensioner thread guide 22, passed through the thread hole of the balance 23 via the balance thread guide 24, and further folded back to the balance thread guide again. After passing through the needle bar thread guide 25 through 24, the needle thread guide 27 is passed through, and finally the upper thread 29 is passed through the thread hole of the needle 28.
[0020]
【The invention's effect】
As described above, according to the present invention, the thread guide pieces are formed on the thread hooking side portions from the right side to the lower side and the lower left side of the thread tension device so as to incline toward the holding surface beyond the outer periphery of the thread tension plate. Therefore, the upper thread is guided by these thread guide pieces, and the upper thread can be automatically passed through the clamping surface, so that it is possible to prevent seam defects caused by erroneous insertion of the upper thread into the thread tensioner, The product value of the sewn product can be improved, and the time required for re-threading due to erroneous insertion is not required, so that the work efficiency can be improved. In addition, gaps S1 and S2 are provided between the guide member and the thread tension plate when the acting force is applied to the thread tension plate by the elastic body so as to guarantee the degree of freedom of inclination of the two thread tension plates. Therefore, these gaps S1 and S2 have the effect of guaranteeing the degree of freedom of the inclination of the thread tension plates 8 and 9, increasing the tightness of the clamping surface, and constantly applying uniform tension to the upper thread 29.
[Brief description of the drawings]
FIG. 1 is a partial perspective view of a thread tension device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state in which an elastic force is applied to a thread tension plate of a thread tension device, which is an embodiment of the present invention.
b is a cross-sectional view showing a state in which an elastic force acting on a thread tension plate of a thread tension device according to an embodiment of the present invention is released.
FIG. 3 is an explanatory diagram for explaining the threading sequence of the upper thread to the thread tensioner of the sewing machine.
4A is a cross-sectional view of a conventional thread tensioner in a state where an elastic force is applied to a thread tension plate of the thread tensioner. FIG.
b is a cross-sectional view of a conventional thread tensioner in a state in which an elastic force acting on a thread tension tray of the thread tensioner is released.
[Explanation of symbols]
3 Thread tensioner 4 Thread tensioner shaft 5 Thread release shaft (thread release means)
8, 9 Thread tension plate 10 Holding plate 12 Plate holding (first guide member)
15 Adjustment knob 16 Conical spring (elastic body)
17 Thread take-up spring 18 Thread hook 19 Adjusting plate (second guide member)
23 Balance 30 Bent part 31, 32 Thread guide piece

Claims

それぞれの挟持面が互いに対向する二枚の糸調子皿と、
それら糸調子皿を圧接させる弾性体と、
弾性体による糸調子皿への作用力を付与したり解除したりする糸緩め手段とを備えたミシンの糸調子器において、
上記二枚の糸調子皿の挟持面とは反対側に上記糸調子皿と対抗してそれぞれ案内部材を備え、
弾性体による糸調子皿への作用力を付与した時の前記案内部材と糸調子皿との間に前記二枚の糸調子皿の傾きの自由度が保証される隙間S1、S2があり、
糸緩め手段により糸調子皿への作用力を解除した時の上記二枚の糸調子皿の糸掛け側に、それぞれの糸調子皿の挟持面とは反対側に配置した前記案内部材から糸調子皿の外周を越えて挟持面に向け傾斜して延出し、糸を糸調子皿の挟持面に案内する糸案内片を設けたことを特徴とするミシンの糸調子器。Two thread tension plates with each clamping surface facing each other;
An elastic body that presses the thread tension plate,
In a thread tension device of a sewing machine provided with thread loosening means for applying or releasing an acting force to a thread tension plate by an elastic body,
Each of the two thread tension plates is provided with a guide member on the opposite side to the clamping surface of the two thread tension plates.
Between the guide member and the thread tension tray when an acting force is applied to the thread tension tray by the elastic body, there are gaps S1 and S2 in which the degree of freedom of inclination of the two thread tension trays is guaranteed ,
Thread tension from the guide member disposed on the opposite side of the holding surface of the respective thread tension trays on the thread hooking side of the two thread tension trays when the acting force on the thread tension trays is released by the thread loosening means A thread tension device for a sewing machine, comprising a thread guide piece extending beyond the outer periphery of the tray to be inclined toward the clamping surface and guiding the yarn to the clamping surface of the thread tension tray.