JP6697242B2

JP6697242B2 - Sewing machine balance

Info

Publication number: JP6697242B2
Application number: JP2015208148A
Authority: JP
Inventors: 貴博西野
Original assignee: Janome Sewing Machine Co Ltd
Current assignee: Janome Corp
Priority date: 2015-10-22
Filing date: 2015-10-22
Publication date: 2020-05-20
Anticipated expiration: 2035-10-22
Also published as: JP2017079812A

Description

本発明は、２本針又は３本針が使用可能な家庭用ミシンに好適なミシンの天秤装置に関する。 The present invention relates to a sewing machine balance device suitable for a domestic sewing machine that can use two or three needles.

従来、1本の針棒に対して天秤は、一つ搭載されている。つまり、1本の上糸に対して一つの天秤及び1本の針棒にてミシンが構成される。ところで、家庭用ミシンにおいても、２本針又は３本針が使用可能なものが存在するようになった。この種のものでは、糸の本数は、針数に応じて上糸は２本又は３本となるが、家庭用のミシンでは、これらの上糸を1本の天秤にて対処している。つまり、1本の天秤で、２本以上の上糸を複数のミシン針に案内する。 Conventionally, one balance is mounted on one needle bar. That is, a sewing machine is composed of one balance and one needle bar for one needle thread. By the way, there are some household sewing machines that can use two or three needles. In this type of machine, the number of threads is two or three depending on the number of needles, but in household sewing machines, these upper threads are handled by a single balance. That is, one balance guides two or more upper threads to a plurality of sewing needles.

一般的な家庭用ミシンでは、複数のミシン針を備えたものに対して、一つの天秤の一つの糸案内孔で複数針のために複数の上糸をまとめて通しつつ、処理するので、糸同士の絡み等の縫い性能の問題が発生している。このような問題を解決しようとするための一例として、特許文献１が存在する。 In a general household sewing machine, a thread having a plurality of sewing needles is processed while one thread guide hole of one balance is used to pass a plurality of needle threads together for a plurality of needles. There is a problem with sewing performance such as entanglement between them. Patent document 1 exists as an example for trying to solve such a problem.

特開平１１−２２６２７３号公報JP, 11-226273, A

特許文献１は、２本針又は３本針を使用したミシンの実施形態が開示されたものについて代表的なものとしてを挙げたものである。この特許文献１によれば、一つの天秤に設けた複数の糸通し孔が、２本針のそれぞれの上糸に対処している。この種のものには、以下に述べる欠点が存在する。 Japanese Patent Application Laid-Open No. 2004-242242 cites a representative of the disclosed embodiments of the sewing machine using two or three needles. According to this patent document 1, a plurality of threading holes provided in one balance deal with the respective upper threads of the two needles. This type of device has the following drawbacks.

また、一般的な家庭用ミシンでは、一つの天秤の糸通し孔に複数本の上糸を全て通すため、上糸同士が捻じれあってしまい、縫い調子が安定しなかったり、縫い不良が発生する場合がある。さらに、特許文献１に開示されたミシンの場合、天秤の根本側の孔と先端側の孔で上糸の引締め量が異なり、各上糸の縫い調子が同じにならない。特許文献１に代表されるように、２本針又は３本針に対して一つの天秤にて対応した場合には、上記のような問題が発生する。 In addition, in a general household sewing machine, multiple upper threads are all threaded through the threading hole of one balance, so the upper threads are twisted together, resulting in unstable sewing conditions and poor sewing. There is a case. Further, in the case of the sewing machine disclosed in Patent Document 1, the tightening amount of the upper thread is different between the hole on the base side and the hole on the tip side of the balance, and the stitches of the respective upper threads are not the same. As represented by Patent Document 1, when one balance is used for two or three needles, the above problem occurs.

上記問題点の原因を、以下に示す。まず、従来の家庭用ミシンのように、一つの天秤に一つの糸案内孔が形成されたタイプでは、ミシンの縫い動作中に、上糸は釜の動作により、釜の内部で反時計方向にねじられてしまう。そして、そのまま縫い動作を続けると、このねじれは、次第に天秤から針孔の間で溜まり、複数本の上糸は互い絡んでしまう。この解決策として、特許文献１に示すように、複数本の上糸は、天秤に空いた複数の孔に1本づつ通して、それぞれの上糸を分離させているので、糸同士が絡むことはない。 The causes of the above problems are shown below. First, in the type in which one thread guide hole is formed in one balance like a conventional household sewing machine, the needle thread moves counterclockwise inside the hook due to the operation of the hook during sewing operation of the sewing machine. It gets twisted. Then, when the sewing operation is continued as it is, this twist gradually accumulates between the balance and the needle hole, and the plural upper threads are entangled with each other. As a solution to this problem, as shown in Patent Document 1, a plurality of upper threads are passed through a plurality of holes formed in the balance one by one to separate the respective upper threads, so that the threads are entangled with each other. There is no.

ミシンは、上糸に適正な緊張を与えるため、上糸を引き締める時に、天秤は根本を中心側とした円弧に近い運動をする。そのため、特許文献１のように天秤に上糸を通す孔が天秤の根本から先端方向にかけて一列に配置される形状であると、天秤根本側の孔は円弧運動の内側軌跡となり、反対に先端側の孔は円弧運動の外側軌蹴となる。この軌跡の違いにより上糸の引き締め量が異なる。そのために、各上糸の張力は異なり、縫製の仕上がりに大きく影響する。 Since the sewing machine applies proper tension to the upper thread, when the upper thread is tightened, the balance moves in an arc close to the root. Therefore, when the holes for passing the upper thread through the balance are arranged in a line from the root of the balance to the tip direction as in Patent Document 1, the holes on the balance root side become the inner locus of the circular arc motion, and conversely on the tip side. The hole of is the outer track of the arc motion. The amount of tightening of the upper thread differs depending on the difference in the locus. Therefore, the tension of each needle thread is different and greatly affects the finish of sewing.

本発明の目的（解決しようとする課題）は、上糸を捕捉する釜機構が一つで、２本針又は３本針等のような複数本の針が装着可能なミシンにおいて、天秤によって、各上糸同士が接触して、上糸同士が捻じれたり、こすれ合ったりすることを防止し、良好な縫い作業及び仕上がりができるようにすることにある。 An object (problem to be solved) of the present invention is to provide a hook mechanism for capturing an upper thread, and a sewing machine in which a plurality of needles such as a two-needle or a three-needle can be mounted by a balance. The purpose of the present invention is to prevent the upper threads from coming into contact with each other and twisting or rubbing the upper threads with each other so that good sewing work and finish can be performed.

そこで、発明者は上記課題を解決すべく、鋭意，研究を重ねた結果、請求項１の発明を、上糸を捕捉する一つの釜機構と、複数の針を有するミシン針と、該ミシン針が装着される針棒と、該針棒と同期して上下動する複数の天秤とを備えたミシンにおいて、前記天秤は、複数の天秤部と、一つの天秤駆動部とを備え、複数の前記天秤部の糸保持部は、それぞれの糸道を分離させるための間隔を設けて並列に配置され、前記天秤部は、天秤腕部と連結部とで構成され、前記天秤駆動部に対して複数の前記連結部が一直線状に配置固定され、前記連結部の軸方向一端には係止部が形成され、他端には被係止部が形成され、連結時には、前記連結部の係止部と連結相手の前記連結部の被係止部とが係止してなるミシンの天秤装置としたことにより、上記課題を解決した。 Then, as a result of earnestly researching in order to solve the above-mentioned subject, the inventor has made the invention of claim 1 one hook mechanism for catching the upper thread, a sewing machine needle having a plurality of needles, and the sewing machine needle. In a sewing machine including a needle bar to which is mounted and a plurality of balances that move up and down in synchronization with the needle bar, the balance includes a plurality of balance units and one balance drive unit, and The thread holding sections of the balance section are arranged in parallel with an interval for separating the respective yarn paths, the balance section is composed of a balance arm section and a connecting section, and a plurality of thread balances are provided for the balance drive section. The connecting part is arranged and fixed in a straight line, a locking part is formed at one axial end of the connecting part, and a locked part is formed at the other end of the connecting part. The above-mentioned problem is solved by using the balance device of the sewing machine in which the locking member and the locked portion of the coupling portion of the coupling partner are locked.

請求項２の発明を、複数の前記天秤部の前記糸保持部はほぼ一致する高さにしてなる請求項１に記載のミシンの天秤装置としたことにより、上記課題を解決した。 The above problem is solved by using the invention of claim 2 as the balance device for a sewing machine according to claim 1, wherein the thread holding portions of the plurality of balance portions have substantially the same height.

請求項３の発明を、複数の前記天秤部は少なくとも一つは前記天秤駆動部に対して着脱自在としてなる請求項１又は２に記載のミシンの天秤装置としたことにより、上記課題を解決した。 The above problem is solved by using the invention of claim 3 as a balance device for a sewing machine according to claim 1 or 2, wherein at least one of the plurality of balance parts is detachable from the balance drive part. ..

請求項４の発明を、前記天秤は、２個及び３個をユニットにしたものを備え、それぞれを前記天秤駆動部に着脱自在となる構成としてなる請求項１，２又は３の何れか１項に記載のミシンの天秤装置としたことにより、上記課題を解決した。 4. The invention according to claim 4, wherein the balance comprises two and three units, each of which is configured to be attachable to and detachable from the balance driving unit. The above-mentioned problems are solved by using the sewing machine balance device described in (1).

請求項１及び請求項２の発明では、ミシンの２本針又は３本針に応じて天秤部の数を合わせることができ、これによって、全ての上糸にそれぞれ天秤部が備えられ、上糸の糸道を分離して独立した糸道とすることができる。特に、複数の前記天秤部の糸保持部はほぼ一致する高さにすると共に、前記天秤部同士は、それぞれの糸道が構成される程度に間隔を設けて並列に配置される構成とした。これによって、複数の天秤部同士の配列において余裕のある間隔を有しており、各天秤部を通過するそれぞれの上糸同士が絡み合ったり、捻じれあうことを防止できる。また、糸道が分離して安定した上糸の供給により、縫い性能が安定する。 According to the inventions of claims 1 and 2, the number of the balance parts can be adjusted according to the two or three needles of the sewing machine, whereby all the upper threads are provided with the respective balance parts, It is possible to separate the yarn paths of the above to make independent yarn paths. In particular, the thread holding sections of the plurality of thread take-up sections are set to have substantially the same height, and the thread take-up sections are arranged in parallel at intervals such that their respective yarn paths are formed. Accordingly, the plurality of balance units have a sufficient space in the arrangement, and it is possible to prevent the upper threads passing through the respective balance units from being entangled or twisted with each other. In addition, the sewing performance is stabilized by separating the yarn path and stably supplying the upper thread.

さらに、天秤部は天秤駆動部から少なくとも一つの天秤部を着脱自在としたので、通常のミシン針が１本の場合では、天秤部を一つにすることができ、ミシン針が２本の場合では、天秤部を２つにすることができる。またさらに、ミシン針が３本の場合では、天秤部を３つにすることができる。このように、一つのミシンでミシン針が１本の場合及び複数本の場合に応じて天秤部の数を設定でき、種々の縫製作業に適応できる。 Further, since at least one balance unit is detachable from the balance drive unit in the balance unit, when the normal sewing machine needle is one, the balance unit can be one, and when the sewing machine needle is two. Then, it is possible to have two balance units. Furthermore, when the number of sewing machine needles is three, the number of balance units can be three. As described above, the number of the balance units can be set according to the case where one sewing machine has one sewing machine needle and a plurality of sewing machines, and it is possible to adapt to various sewing operations.

また、請求項１及び請求項２の発明では、天秤部は、天秤腕部と連結部とを有し、前記天秤駆動部に対して前記連結部を一直線状に配置固定した構成により、複数の天秤部の糸保持部が一列に配列される。これによって、天秤部は全て同一の揺動動作を行い上糸の引締めが均一となる。 Further, in the invention of claim 1 and claim 2, the balance section has a balance arm section and a connecting section, and the connecting section is arranged and fixed in a straight line with respect to the balance driving section. The thread holding units of the balance unit are arranged in a line. As a result, all the balance parts perform the same swinging motion, and the tightening of the upper thread becomes uniform.

さらに、請求項１及び請求項２の発明では、連結部の軸方向一端には係止部が形成され、他端には被係止部が形成され、軸方向に隣接する前記連結部同士は係止部と被係止部とが係止される構成としたことで、ミシン作動時における天秤部同士の位置ずれを防止できる。 Further, in the inventions of claims 1 and 2, a locking portion is formed at one end in the axial direction of the connecting portion, and a locked portion is formed at the other end, and the connecting portions that are adjacent in the axial direction are connected to each other. With the configuration in which the locking portion and the locked portion are locked, it is possible to prevent displacement of the balance portions during operation of the sewing machine.

請求項３の発明では、複数の前記天秤部は少なくとも一つは前記天秤駆動部に対して着脱自在としてなる構成により、複数の天秤部を天秤駆動部に装着する構成を簡単にできる。請求項４の発明では、天秤部を２個及び３個をユニットにしたものを備え、それぞれを前記天秤駆動部に着脱自在となる構成としたので、複数の天秤部の交換を簡単且つ迅速にできる。また、前記連結部は中空管状とし、複数の前記連結部に挿通する螺子軸部を有する螺子部材と、該螺子部材の螺子軸部と螺合する内螺子部が天秤駆動部に形成されてなる構成とすることにより、複数の天秤部を天秤駆動部に装着する構成を簡単にできる。さらに、前記係止部は中空管内部に形成された突起とし、前記被係止部は前記突起が挿入する凹部としてなる構成とすることにより、係止構造を簡単にできる。
According to the third aspect of the present invention, at least one of the plurality of balance units is detachable from the balance drive unit, so that the configuration in which the plurality of balance units are attached to the balance drive unit can be simplified. According to the invention of claim 4, the balance section is composed of two and three units, each of which is configured to be attachable to and detachable from the balance drive section. Therefore, a plurality of balance sections can be replaced easily and quickly. it can. Further, the connecting portion is formed in a hollow tubular shape, and a screw member having a screw shaft portion that is inserted into the plurality of connecting portions, and an inner screw portion that is screwed with the screw shaft portion of the screw member are formed in the balance driving portion. With this structure, the structure for mounting the plurality of balance units on the balance drive unit can be simplified. Furthermore, the locking structure can be simplified by configuring the locking portion as a projection formed inside the hollow tube and the locked portion as a recess into which the projection is inserted.

（Ａ）は本発明の天秤装置を有するミシンの略示図、（Ｂ）は本発明における天秤装置の拡大斜視図、（Ｃ）は本発明における天秤装置の一部断面にした拡大正面図である。(A) is a schematic view of a sewing machine having the balance device of the present invention, (B) is an enlarged perspective view of the balance device of the present invention, and (C) is an enlarged front view of a partial cross section of the balance device of the present invention. is there. （Ａ）は本発明における天秤装置の分解斜視図、（Ｂ）は天秤装置を分解し且つ一部断面にした拡大正面図である。(A) is an exploded perspective view of a balance device according to the present invention, and (B) is an enlarged front view of the balance device in a partially disassembled state. （Ａ）は天秤部の拡大側面図、（Ｃ）は天秤部の一部断面にした拡大正面図、（Ｃ）は一部切除した連結部の拡大斜視図である。(A) is an enlarged side view of the balance unit, (C) is an enlarged front view of a partial cross section of the balance unit, and (C) is an enlarged perspective view of a partially cut connecting portion. （Ａ）は別の実施形態の係止部及び被係止部を設けた天秤部の拡大斜視図、（Ｂ）は（Ａ）の一部切除したＹ1矢視図、（Ｃ）は（Ａ）の一部切除したＹ2矢視図である。(A) is an enlarged perspective view of a balance portion provided with a locking portion and a locked portion of another embodiment, (B) is a partially cutaway Y1 arrow view of (A), and (C) is (A). 7 is a partially cutaway view of the Y2 arrow. （Ａ）は３個の天秤部を天秤駆動部に装着した拡大斜視図、（Ｂ）は２個の天秤部をユニット（一体）化したもの又は３個の天秤部をユニット（一体）化したものを天秤駆動部に適宜着脱自在に装着可能なことを示す斜視図である。(A) is an enlarged perspective view in which three balance units are attached to the balance driving unit, (B) is a unit (integrated) of two balance units, or three balance units are integrated (integrated). FIG. 7 is a perspective view showing that an object can be appropriately detachably attached to the balance driving unit.

以下、本発明の実施形態を図面に基づいて説明する。まず、本発明は、図１に示すように、上糸ｎを捕捉する１つの釜機構９８と、針棒７と天秤とを備えたミシン９であり、特に、２本又は３本の針を有するミシン針８に対応する天秤を備えたものである。該ミシン針８は、針棒７に装着されており、該針棒７は、天秤の上下動と共に移動する〔図１（Ａ）参照〕。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, as shown in FIG. 1, the present invention is a sewing machine 9 including one shuttle mechanism 98 for catching the upper thread n, a needle bar 7 and a balance, and particularly, two or three needles. The balance corresponding to the sewing machine needle 8 is provided. The sewing machine needle 8 is attached to the needle bar 7, and the needle bar 7 moves with the vertical movement of the balance [see FIG. 1 (A)].

天秤は、主に、天秤部Ａ1と天秤駆動部Ａ2によって構成される。天秤部Ａ1は天秤腕部１と連結部２とを有する。前記天秤部Ａ1の天秤腕部１は、板状に形成され、上下方向に揺動する〔図１（Ｂ），（Ｃ）参照〕。天秤腕部１は、連結部２を揺動中心として、外方に向かって突出形成されている〔図２（Ａ），図３（Ａ）参照〕。 The balance is mainly composed of a balance section A1 and a balance drive section A2. The balance part A1 has a balance arm part 1 and a connecting part 2. The balance arm portion 1 of the balance portion A1 is formed in a plate shape and swings vertically (see FIGS. 1B and 1C). The balance arm portion 1 is formed so as to project outward with the connecting portion 2 as the swing center [see FIGS. 2 (A) and 3 (A)].

天秤腕部１の自由端部分は、その自由端より下方に屈曲された屈曲先端部１１が形成され、該屈曲先端部１１には、略スリット状の糸導入部１２が形成されている。該糸導入部１２の終端には、糸保持部１２ａが形成されている。該糸保持部１２ａは、円形状の貫通孔である〔図３（Ａ）参照〕。また、従来のミシンで採用されている天秤の自由端に設けられたスリットの存在しない貫通孔を糸保持部としてもよい。 A free end portion of the balance arm portion 1 is formed with a bent tip portion 11 bent downward from the free end, and the bent tip portion 11 is provided with a thread introduction portion 12 having a substantially slit shape. A yarn holding portion 12a is formed at the end of the yarn introducing portion 12. The thread holding portion 12a is a circular through hole [see FIG. 3 (A)]. Further, a thread-holding portion may be a through-hole provided at the free end of a balance used in a conventional sewing machine and having no slit.

前記連結部２は、複数の天秤部Ａ1を連結する役目と、後述する天秤駆動部Ａ2に連結する役目をなす（図２参照）。連結部２は、中空管状に形成され、前記天秤腕部１の一方側の面に対して垂直に固定されている〔図２（Ｂ），図３（Ｂ）参照〕。連結部２の軸方向一方側は、被挿入側２ａとし、他方側は挿入側２ｂとする〔図３（Ｂ）参照〕。連結部２の内部は、軸方向に貫通する軸貫通孔２１が形成されている。軸貫通孔２１は、大径孔部２１ａと小径孔部２１ｂとで構成されている〔図３（Ｂ）参照〕。そして、大径孔部２１ａは前記被挿入側２ａに位置し、小径孔部２１ｂは前記挿入側２ｂに位置する。 The connecting portion 2 serves to connect a plurality of balance portions A1 and to a balance driving portion A2 which will be described later (see FIG. 2). The connecting portion 2 is formed in a hollow tubular shape and is fixed perpendicularly to the surface of the balance arm portion 1 on one side (see FIGS. 2B and 3B). One side in the axial direction of the connecting portion 2 is the inserted side 2a, and the other side is the inserting side 2b [see FIG. 3 (B)]. A shaft through hole 21 is formed inside the connecting portion 2 so as to penetrate in the axial direction. The shaft through hole 21 is composed of a large diameter hole portion 21a and a small diameter hole portion 21b [see FIG. 3 (B)]. The large diameter hole portion 21a is located on the insertion side 2a, and the small diameter hole portion 21b is located on the insertion side 2b.

大径孔部２１ａには、別の天秤部Ａ1の連結部２の前記挿入側２ｂが挿入可能な内径となっている。複数の天秤部Ａ1を連結するときには、連結部２の挿入側２ａが、連結先の連結部２の被挿入側２ｂに挿入されて、軸方向に隣接する連結部２，２同士が所定の間隔を有して連結される〔図１（Ｃ）参照〕。 The large-diameter hole portion 21a has an inner diameter such that the insertion side 2b of the connecting portion 2 of another balance portion A1 can be inserted. When connecting a plurality of balance parts A1, the insertion side 2a of the connection part 2 is inserted into the inserted side 2b of the connection part 2 of the connection destination, and the connection parts 2 adjacent to each other in the axial direction are separated by a predetermined distance. And are connected [see FIG. 1 (C)].

前記連結部２には、連結部２の被挿入側２ａに被係止部３１が形成され、挿入側２ｂに係止部３２が形成されている。そして、連結部２，２同士が連結するときには、連結部２の挿入側２ｂが連結先の連結部２の被挿入側２ａに挿入すると共に、係止部３２が被係止部３１に係止して回転を規制しながら挿入位置を規定する。 In the connecting portion 2, a locked portion 31 is formed on the inserted side 2a of the connecting portion 2, and a locking portion 32 is formed on the inserting side 2b. Then, when the connecting portions 2 and 2 are connected to each other, the insertion side 2b of the connecting portion 2 is inserted into the inserted side 2a of the connecting portion 2 of the connection destination, and the locking portion 32 is locked to the locked portion 31. The insertion position is regulated while regulating the rotation.

これによって、連結状態の連結部２，２が軸周方向に勝手に空転することはなく、よって、隣接する天秤腕部１，１同士も同一位相を維持しながら所定の間隔を有して固定される〔図１（Ｂ），図５（Ａ）参照〕。 As a result, the connecting portions 2 and 2 in the connected state do not idle freely in the circumferential direction of the shaft, and therefore the adjacent balance arm portions 1 and 1 are fixed at a predetermined interval while maintaining the same phase. [See FIG. 1 (B) and FIG. 5 (A)].

被係止部３１と係止部３２には、複数の実施形態が存在する。その第１実施形態としては、被係止部３１は、連結部２の被挿入側２ａの内周側面に突起３１ａとして形成されたものであり、係止部３２は、切欠き状の凹部３２ａとして形成されたものである（図３参照）。該凹部３２ａは、連結部２における挿入側２ｂの円周状縁の一部に前記係止部３２が挿入する切欠き部であり、略方形状に形成されている。 There are a plurality of embodiments of the locked portion 31 and the locking portion 32. In the first embodiment, the locked portion 31 is formed as a protrusion 31a on the inner peripheral side surface of the insertion side 2a of the coupling portion 2, and the locking portion 32 is a cutout-shaped recess 32a. (See FIG. 3). The concave portion 32a is a notch portion into which the locking portion 32 is inserted in a part of a circumferential edge of the connecting portion 2 on the insertion side 2b, and is formed in a substantially rectangular shape.

次に、被係止部３１と係止部３２における別の実施形態について説明する（図４参照）。被係止部３１は、連結部２の被挿入側２ａの大径孔部２１ａが小判孔形状に形成されたものである。そして、連結部２の挿入側２ｂの外周形状も外周の一部にカット面が平行に形成されたものである。 Next, another embodiment of the locked portion 31 and the locking portion 32 will be described (see FIG. 4). The locked portion 31 has a large-diameter hole portion 21a on the inserted side 2a of the connecting portion 2 formed in an oval shape. The outer peripheral shape of the insertion side 2b of the connecting portion 2 also has a cut surface formed in parallel with a part of the outer periphery.

このような形状とした連結部２の挿入側２ｂを別の連結部２の被挿入側２ａに挿入することにより、連結部２，２同士が相互に空転しない連結とすることができる。また、前記被係止部３１，係止部３２の形状は限定されない。 By inserting the insertion side 2b of the connecting portion 2 having such a shape into the inserted side 2a of another connecting portion 2, the connecting portions 2 and 2 can be connected so as not to idle each other. Further, the shapes of the locked portion 31 and the locking portion 32 are not limited.

天秤駆動部Ａ2は、主リンク４と、従リンク５とから構成される〔図２（Ａ）参照〕。主リンク４は、駆動連結部４１と第１軸支部４２とが腕状部４３にて接続される構成である。第１軸支部４２の内周には軸受孔部４２ａと内螺子部４２ｂとが形成されている。従リンク５は、揺動連結部５１はと第２軸支部５２とが腕状部５３にて接続される構成である。 The balance drive unit A2 is composed of a main link 4 and a slave link 5 [see FIG. 2 (A)]. The main link 4 is configured such that the drive connecting portion 41 and the first shaft supporting portion 42 are connected by the arm-shaped portion 43. A bearing hole portion 42a and an inner screw portion 42b are formed on the inner circumference of the first shaft support portion 42. The slave link 5 has a configuration in which the swing connecting portion 51 and the second shaft supporting portion 52 are connected by the arm-shaped portion 53.

主リンク４の駆動連結部４１は、枢支連結孔４１ａが形成されている。そして、該枢支連結孔４１ａを貫通する枢支連結ピン９３によって、前記主リンク４がミシン本体９の上駆動軸９１に装着された釣合錘９２に枢支連結される〔図１（Ａ），図２（Ａ）参照〕。該釣合錘９２には、前記枢支連結ピン９３が取り付けられる取付孔９２ａが形成されている。前記主リンク４の第１軸支部４２は、前記従リンク５の第２軸支部５２に回動自在に挿入される。 The drive connecting portion 41 of the main link 4 has a pivotal connecting hole 41a formed therein. Then, the main link 4 is pivotally connected to the counterweight 92 mounted on the upper drive shaft 91 of the sewing machine body 9 by the pivotal connection pin 93 penetrating the pivotal connection hole 41a [FIG. ), See FIG. 2 (A)]. The counterweight 92 is formed with a mounting hole 92a to which the pivotally connecting pin 93 is mounted. The first shaft support portion 42 of the main link 4 is rotatably inserted into the second shaft support portion 52 of the slave link 5.

そして、複数の天秤部Ａ１において、まず一個目の天秤部Ａ1の連結部２が、前記第１軸支部４２の軸受孔部４２ａに挿入して固定される。ここで、前記第１軸支部４２の軸受孔部４２ａ内にも被係止部４４が形成されている〔図２（Ｂ）参照〕。該被係止部４４は、突起４４ａである。そして、該軸受孔部４２ａの被係止部４４と、前記軸受孔部４２ａ内に挿入された連結部２３の係止部３２とが係止され、天秤部Ａ1の連結部２と、主リンク４の第１軸支部４２とが周方向に固定され、駆動軸９１，釣合錘９２の動作が主リンク４及び天秤部Ａ1に伝達される。 Then, in the plurality of balance portions A1, first, the connecting portion 2 of the first balance portion A1 is inserted and fixed in the bearing hole portion 42a of the first shaft support portion 42. Here, a locked portion 44 is also formed in the bearing hole portion 42a of the first shaft support portion 42 (see FIG. 2B). The locked portion 44 is a protrusion 44a. The locked portion 44 of the bearing hole portion 42a and the locking portion 32 of the connecting portion 23 inserted in the bearing hole portion 42a are locked, and the connecting portion 2 of the balance portion A1 and the main link. 4 is fixed to the first shaft support portion 42 in the circumferential direction, and the operations of the drive shaft 91 and the counterweight 92 are transmitted to the main link 4 and the balance portion A1.

次に、一個目の前記天秤部Ａ1の被挿入側２ａに、二個目の天秤部Ａ１の挿入側２ｂが挿入されると共に、被係止部３１と係止部３２とが係止される。そして、一個目の前記天秤部Ａ1と二個目の前記天秤部Ａ1とが並列に配置され、且つそれぞれの糸保持部１２ａ，１２ａの位置が一致する高さに揃うように設定される〔図１(Ｂ)，（Ｃ）参照〕。 Next, the insertion side 2b of the second balance portion A1 is inserted into the insertion side 2a of the first balance portion A1, and the locked portion 31 and the locking portion 32 are locked. .. Then, the first balance section A1 and the second balance section A1 are arranged in parallel, and the thread holding sections 12a, 12a are set to be aligned at the same height [Fig. 1 (B), (C)].

また、複数の前記天秤部Ａ１，Ａ1における糸保持部１２ａ，１２ａの位置が一致することとは、両糸保持部１２ａ，１２ａのそれぞれの位置が上下方向に僅かにずれ（高低差）が存在する場合、つまり、ほぼ一致する場合も含まれる。この状態で、天秤部Ａ1の軸貫通孔２１と、第２軸支部５２の内周側に形成された内螺子部４２ｂに螺子部材６の連結軸６１が挿入され、該連結軸６１に形成された外螺子６１ａが内螺子４２ｂと螺合する〔図１(Ｂ)，（Ｃ）参照〕。 In addition, the fact that the positions of the thread holding portions 12a, 12a in the plurality of balance portions A1, A1 coincide with each other means that the respective positions of both thread holding portions 12a, 12a are slightly displaced in the vertical direction (the difference in height). When it does, that is, when it almost matches, it is included. In this state, the connecting shaft 61 of the screw member 6 is inserted into the shaft through hole 21 of the balance part A1 and the inner screw part 42b formed on the inner peripheral side of the second shaft support part 52, and the connecting shaft 61 is formed. The outer screw 61a is screwed with the inner screw 42b [see FIGS. 1 (B) and 1 (C)].

前記従リンク５の揺動連結部５１には、枢支連結孔５１ａが形成されており、該枢支連結孔５１ａを貫通する取付ピン９４によって、前記揺動連結部５１がミシン本体９の所定位置に枢支連結される。このように、複数の天秤部Ａ1，Ａ1，…のそれぞれの糸保持部１２ａ，１２ａ，…は、ほぼ一致する高さとなる。 A pivot support connecting hole 51a is formed in the swing connecting portion 51 of the slave link 5, and the swing connecting portion 51 is predetermined in the sewing machine body 9 by a mounting pin 94 penetrating the pivot supporting connecting hole 51a. Pivotally connected to the position. In this way, the thread holding portions 12a, 12a, ... Of the plurality of balance portions A1, A1 ,.

そして、隣接する天秤部Ａ1，Ａ1，…同士は、それぞれの上糸ｎの糸道が構成される程度に間隔を設けて並列に配置されている〔図１（Ｂ），（Ｃ），図３等参照〕。これによって、複数の天秤部Ａ1，Ａ1，…同士の配列において余裕のある間隔を有しており、各天秤部Ａ1を通過するそれぞれの上糸ｎ同士が絡み合ったり、捻じれあうことを防止できる。また、糸道が分離して安定した上糸ｎの供給により、縫い性能が安定する。 The adjacent balance portions A1, A1, ... Are arranged in parallel at intervals such that the yarn paths of the respective upper yarns n are formed [FIG. 1 (B), (C), FIG. See 3rd grade]. As a result, the plurality of balance parts A1, A1, ... Have a sufficient space in the arrangement, and it is possible to prevent the upper threads n passing through each balance part A1 from being entangled or twisted. .. Further, the sewing performance is stabilized by the stable supply of the upper thread n by separating the thread path.

そして、ミシンを作動させると、前記上駆動軸９１がミシンモータ９５，プーリ９６及びベルト９７によって回転が伝達されると共に釣合錘９２も回転し、該釣合錘９２によって主リンク４の駆動連結部４１が所定の軌跡に基づいて運動し、第１軸支部４２が従リンク５の第２軸支部５２と共に、ミシン本体９に枢支連結された揺動連結部５１を回転中心にして揺動し、複数の天秤部Ａ1，Ａ1，…が所定の軌跡に基づいて上下方向に揺動運動する。本発明の説明において、天秤部Ａ1の数は、図１乃至図４では、２個としたものである。また、図５（Ａ）では、３個の天秤部Ａ1，Ａ1，…を天秤駆動部Ａ2に装着したものである。 Then, when the sewing machine is operated, the rotation of the upper drive shaft 91 is transmitted by the sewing machine motor 95, the pulley 96, and the belt 97, and the counterweight 92 also rotates, so that the main link 4 is driven and connected by the counterweight 92. The portion 41 moves based on a predetermined locus, and the first shaft support portion 42 swings together with the second shaft support portion 52 of the secondary link 5 about the swing connection portion 51 pivotally connected to the sewing machine body 9 as a rotation center. Then, the plurality of balance parts A1, A1, ... Swing vertically based on a predetermined locus. In the description of the present invention, the number of balance portions A1 is two in FIGS. Further, in FIG. 5 (A), three balance parts A1, A1, ... Are attached to the balance driving part A2.

第２軸支部５２が第１軸支部４２に回動自在に軸支され、前記第２軸支部５２に前記天秤腕部１の連結部２が挿入される。複数の天秤部Ａ1，Ａ1，…を並列に配置し、該天秤部Ａ1の軸貫通孔２１と、第２軸支部５２の内周側に形成された内螺子部４２ｂに螺子部材６の連結軸６１が挿入され、該連結軸６１に形成された外螺子６１ａが内螺子４２ｂと螺合する。 The second shaft support portion 52 is rotatably supported by the first shaft support portion 42, and the connecting portion 2 of the balance arm portion 1 is inserted into the second shaft support portion 52. A plurality of balance parts A1, A1, ... Are arranged in parallel, and the shaft through hole 21 of the balance part A1 and the inner screw part 42b formed on the inner peripheral side of the second shaft support part 52 are connected to the connecting shaft of the screw member 6. 61 is inserted, and the outer screw 61a formed on the connecting shaft 61 is screwed with the inner screw 42b.

次に、本発明の第２実施形態として、前記天秤部Ａ1は、予め２個及び３個を一体化してユニットとしたものを備えておき、それぞれを前記天秤駆動部Ａ2に着脱自在とする構成にすることもある〔図５（Ｂ）参照〕。この実施形態では、２個の天秤部Ａ1を、一方の連結部２を介して分離不能に一体化する。 Next, as a second embodiment of the present invention, the balance unit A1 is provided with a unit in which two and three units are integrated in advance, and each unit is detachably attached to the balance drive unit A2. In some cases (see FIG. 5B). In this embodiment, the two balance parts A1 are inseparably integrated via one connecting part 2.

また、３個の天秤部Ａ1を、二つの連結部２を介して分離不能に一体化する。そして、列の最後部に位置する天秤部Ａ1の連結部２は、そのまま、天秤駆動部Ａ2の第２軸支部５２に対して螺子部材６によって着脱自在に固着するものである。このように、天秤部Ａ1を２個又は３個を予め一体化して２個ユニット又は３個ユニットにしたものを揃えるのみで、２本針又は３本針に適応した天秤装置に組み付けることができる。また、複数の天秤部Ａ1，Ａ1，…の交換作業を簡単且つ迅速にできる。また、天秤部Ａ1を単体（１個）とした場合には、通常のミシンとして使用することもできる。 Further, the three balance parts A1 are inseparably integrated via the two connecting parts 2. The connecting portion 2 of the balance portion A1 located at the rearmost portion of the row is detachably fixed to the second shaft support portion 52 of the balance driving portion A2 by the screw member 6 as it is. In this way, it is possible to assemble the balance part A1 into a balance device suitable for a two-needle or a three-needle by simply aligning two or three units of the balance part A1 which are previously integrated into a two-unit or a three-unit. .. Further, the replacement work of the plurality of balance parts A1, A1, ... Can be performed easily and quickly. Further, when the balance portion A1 is a single piece (one piece), it can be used as an ordinary sewing machine.

Ａ1…天秤部、Ａ2…天秤駆動部、２…連結部、３１…被係止部、３２…係止部、
５１ａ…螺子軸部、６…螺子部材、７…針棒、８…ミシン針。 A1 ... Balance part, A2 ... Balance drive part, 2 ... Connection part, 31 ... Locked part, 32 ... Locking part,
51a ... screw shaft part, 6 ... screw member, 7 ... needle bar, 8 ... sewing needle.

Claims

A sewing machine including one hook mechanism for capturing an upper thread, a sewing machine needle having a plurality of needles, a needle bar to which the sewing machine needle is attached, and a plurality of balances that move up and down in synchronization with the needle bar. the balance is provided with a plurality of balance portions, and one of the thread take-up lever drive unit, the thread holding portion of plurality of said balance portion are arranged in parallel spaced for separating each yarn, the The balance portion is composed of a balance arm portion and a connecting portion, a plurality of the connecting portions are arranged and fixed in a straight line with respect to the balance driving portion, and a locking portion is formed at one axial end of the connecting portion. A balance of a sewing machine , wherein a locked portion is formed at the other end, and the locking portion of the coupling portion and the locked portion of the coupling portion of the coupling partner are locked during coupling. apparatus.

2. The balance device for a sewing machine according to claim 1, wherein the thread holding portions of the plurality of balance portions have substantially the same height.

The balance device for a sewing machine according to claim 1 or 2, wherein at least one of the plurality of balance units is detachable from the balance drive unit.

The balance is provided with two and three units, each of which is configured to be attachable to and detachable from the balance drive unit. Sewing machine balance device.