JP4734874B2 - Sewing machine thread trimmer - Google Patents
Sewing machine thread trimmer Download PDFInfo
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- JP4734874B2 JP4734874B2 JP2004279813A JP2004279813A JP4734874B2 JP 4734874 B2 JP4734874 B2 JP 4734874B2 JP 2004279813 A JP2004279813 A JP 2004279813A JP 2004279813 A JP2004279813 A JP 2004279813A JP 4734874 B2 JP4734874 B2 JP 4734874B2
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Description
本発明は、回転釜の内釜上面に上糸の捩れを防止する植毛状のパイル部材を設けた場合でも、糸切り装置の糸捕捉体による上下両糸の糸捕捉を確実に行えるようにしたものに関する。 In the present invention, even when a flocked pile member that prevents twisting of the upper thread is provided on the upper surface of the inner hook of the rotary hook, the upper and lower threads can be reliably caught by the thread catcher of the thread trimming device. About things.
従来、縫製中断時や縫製終了時に、上糸と下糸を切断するための糸切り装置を備えたミシンが提供されている。この種の糸切り装置においては、糸捕捉体を往復移動可能に設け、糸捕捉体を往復移動させることで上糸と下糸を捕捉し、その捕捉された上糸と下糸を切断するようにしてある。 2. Description of the Related Art Conventionally, there has been provided a sewing machine including a thread trimming device for cutting an upper thread and a lower thread when sewing is interrupted or when sewing is completed. In this type of thread trimming device, the yarn catcher is provided so as to be able to reciprocate, the upper and lower yarns are caught by reciprocating the yarn catcher, and the captured upper and lower yarns are cut. It is.
例えば、特許文献１のミシンに設けられた糸切り装置は、糸切断時に、往復移動可能な糸捕捉体を往動させた後に、外釜の回転により剣先と共に移動してきた上糸を捕捉するまでの間、糸捕捉体を一旦停止させて待機させる。その後、糸捕捉体を復動させて下糸を捕捉して、その糸捕捉体に捕捉された上糸と下糸を、固定的に設けた切断刃と協働して同時に切断するようにしてある。 For example, the thread trimming device provided in the sewing machine of Patent Document 1 moves the thread catcher that can be reciprocated during thread cutting until the upper thread that has moved with the sword by the rotation of the outer hook is captured. During this period, the yarn catcher is temporarily stopped and waited. After that, the thread catcher is moved backward to catch the lower thread, and the upper thread and the lower thread captured by the thread catcher are cut at the same time in cooperation with a fixed cutting blade. is there.
ところで、通常の縫製時においては、回転釜の剣先により引っ掛けられた上糸ループが内釜から糸抜けした後に、その上糸ループが天秤により引き上げられることで縫目が形成されるが、その上糸ループが弛んで捩じれが発生し、その捩じれた状態のまま天秤により上糸ループが引き上げられて縫目が形成されてしまい、所謂タオル目と呼ばれる縫目不良が発生する場合が稀にある（例えば、特許文献２（段落番号[０００６]、[０００７]）参照）。 By the way, in normal sewing, after the upper thread loop hooked by the sword of the rotary hook is pulled out from the inner hook, the upper thread loop is pulled up by a balance to form a seam. In some rare cases, the thread loop is loosened and twisted, and the upper thread loop is pulled up by the balance while the twisted state is formed to form a seam, resulting in a seam defect called a so-called towel seam ( For example, see Patent Document 2 (paragraph numbers [0006] and [0007]) .
また、糸切り装置における糸捕捉体が上糸を捕捉する際に、上糸ループの弛みにより捕捉ミスが発生することがある。このような縫製不良や上糸の捕捉ミスを防止するために、内釜から糸抜けした上糸ループを軽く保持するための植毛状のパイル部材を内釜上面に貼着し、そのパイル部材により上糸ループの弛みを防止し、捩じれを発生させないような対策を施したミシンがある（例えば、特許文献３（段落番号[００１１]、[００２０]）参照）。 Further, when the yarn catcher in the yarn trimming device catches the upper yarn, a catching error may occur due to the slack of the upper yarn loop. In order to prevent such poor sewing and catching error of the upper thread, a flocked pile member for lightly holding the upper thread loop from which the thread has been removed from the inner hook is attached to the upper surface of the inner hook, and the pile member There is a sewing machine in which measures are taken to prevent loosening of the upper thread loop and prevent twisting (see, for example, Patent Document 3 (paragraph numbers [0011] and [0020])) .
また、送り歯による布送りを使用せずに刺繍縫製等を行う場合には、送り歯による布送りを不作用状態に切換えるために、送り歯を針板上面から突出しない沈下位置に切換え可能な送り歯沈下機構を設けたミシンが普及している（例えば、特許文献４参照）。
前述した特許文献１に記載のミシンに設けられた糸切り装置において、内釜上面にパイル部材を設けるとともに、送り歯沈下機構を設け、送り歯沈下機構により送り歯を沈下位置に沈下させた状態で縫製する場合、内釜に収容された下糸ボビンから繰り出された下糸は、沈下状態の送り歯により常にパイル部材に押えられた状態であるため、下糸がパイル部材の内部に潜り込んでしまい、糸切断に際して糸捕捉体が往動したときに、その捕捉部でパイル部材の内部に潜り込んだ下糸を捕捉できず、下糸を切断できない場合が起こるという問題がある。 In the thread trimming device provided in the sewing machine described in Patent Document 1 described above, a pile member is provided on the upper surface of the inner hook, a feed dog subsidence mechanism is provided, and the feed dog is sunk to the subsidence position by the feed dog subsidence mechanism. When sewing with the lower thread bobbin housed in the inner hook, the lower thread is always pressed against the pile member by the sinking feed dog, so the lower thread will sink into the pile member. Therefore, when the yarn catcher moves forward during yarn cutting, there is a problem that the lower yarn that has entered the inside of the pile member cannot be caught by the catching portion and the lower yarn cannot be cut.
請求項１に係るミシンの糸切り装置は、ミシンの針板の下側において回転釜に接近させて配設された糸切り装置であって、往復移動により布から延びる上糸と下糸とを捕捉する糸捕捉体と、その糸捕捉体で捕捉された上糸と下糸とを切断する切断刃とを有する糸切り装置において、回転釜の内釜から外れた上糸ループの天秤による糸引き上げに際して上糸の捩じれを防止する為の植毛状のパイル部材を内釜上面に設け、パイル部材に潜り込んだ下糸を浮き上がらせるための糸引っ掛け部を糸捕捉体に設けたものである。 A thread trimming device for a sewing machine according to a first aspect is a thread trimming device disposed close to a rotary hook at a lower side of a needle plate of the sewing machine, and an upper thread and a lower thread extending from a cloth by reciprocating movement. In a thread trimmer having a thread catcher to be caught and a cutting blade for cutting an upper thread and a lower thread that have been caught by the thread catcher, the thread is pulled up by a balance of an upper thread loop removed from the inner hook of the rotary hook In this case, a flocked pile member for preventing twisting of the upper thread is provided on the upper surface of the inner hook, and a thread catching part for lifting the lower thread that has entered the pile member is provided on the thread catcher.
糸切断に際して、下糸が回転釜の内釜上面に設けた植毛状のパイル部材の内部に潜り込んでいる場合でも、糸捕捉体に設けた糸引っ掛け部により、パイル部材に潜り込んだ下糸を浮き上がらせ、その浮き上がった下糸を糸捕捉体で捕捉し、切断刃との協働で上糸と下糸とが切断される。 When cutting the thread, even if the bobbin thread is embedded in the flocked pile member provided on the upper surface of the inner hook of the rotary hook, the thread hooking part provided on the thread catcher lifts the lower thread that has entered the pile member. Then, the floated lower thread is captured by the thread catcher, and the upper thread and the lower thread are cut in cooperation with the cutting blade.
請求項２に係るミシンの糸切り装置は、請求項１の発明において、前記糸捕捉体は布側の上糸及び下糸を捕捉する第１糸捕捉部と、針側の上糸とボビン側の下糸を捕捉する第２糸捕捉部を有し、糸引っ掛け部の下端が第２糸捕捉部の下端よりも低く形成されたものである。 A thread trimming device for a sewing machine according to a second aspect of the present invention is the sewing machine according to the first aspect, wherein the thread catcher includes a first thread catcher that catches the upper thread and the lower thread on the fabric side, the upper thread and the bobbin side on the needle side. A second yarn catching portion that catches the lower yarn, and the lower end of the yarn hooking portion is formed lower than the lower end of the second yarn catching portion.
請求項３に係るミシンの糸切り装置は、請求項２の発明において、前記糸引っ掛け部は第２糸捕捉部に対して糸捕捉体の往動方向下流側に所定距離隔てて糸捕捉体と一体形成され、糸引っ掛け部の下端部は鋭角状に形成され、その鋭角状に形成された先端部が第２糸捕捉部側に向かう方向に設けられたものである。 A thread trimming device for a sewing machine according to a third aspect of the present invention is the sewing machine according to the second aspect, wherein the yarn hooking portion is separated from the second yarn catching portion by a predetermined distance downstream in the forward movement direction of the yarn catching body. The lower end portion of the yarn hooking portion is formed in an acute angle shape, and the tip portion formed in the acute angle shape is provided in a direction toward the second yarn catching portion side.
請求項４に係るミシンの糸切り装置は、請求項１〜３の何れかの発明において、前記糸引っ掛け部は、糸捕捉体の往動完了時までにパイル部材に潜り込んだ下糸を引っ掛けて浮き上がらせる位置に設けられたものである。 A thread trimming device for a sewing machine according to a fourth aspect of the present invention is the sewing machine according to any one of the first to third aspects, wherein the yarn hooking section hooks the lower thread that has entered the pile member until the yarn catcher completes the forward movement. It is provided at a position to lift up.
請求項５に係るミシンの糸切り装置は、請求項１〜４の何れかの発明において、前記糸引っ掛け部から糸捕捉体の基端部に至る糸摺接部は、上糸が摺接して移動可能な直線又は曲線で連続的に繋がる形状である。 A thread trimming device for a sewing machine according to a fifth aspect of the present invention is the sewing machine according to any one of the first to fourth aspects, wherein the thread sliding contact portion from the yarn hooking portion to the base end portion of the yarn catching body is in sliding contact with the upper thread. It is a shape that is continuously connected by a movable straight line or curve.
請求項１の発明によれば、回転釜の内釜から外れた上糸ループの天秤による糸引き上げに際して上糸の捩じれを防止する為の植毛状のパイル部材を内釜上面に設け、パイル部材に潜り込んだ下糸を浮き上がらせるための糸引っ掛け部を糸捕捉体に設けたので、糸切断に際して、下糸が回転釜の内釜上面に設けた植毛状のパイル部材の内部に潜り込んでいるような場合でも、糸捕捉体に設けた糸引っ掛け部により、パイル部材に潜り込んだ下糸を浮き上がらせることができ、その浮き上がった下糸を糸捕捉体で捕捉できるため、切断刃との協働で上糸と下糸とを確実に切断することができる。 According to the first aspect of the present invention, a flocked pile member is provided on the upper surface of the inner hook so as to prevent twisting of the upper thread when the upper thread loop removed from the inner hook of the rotary hook is pulled up by the balance. Since the thread catcher has been provided in the thread catcher to lift the submerged lower thread, the lower thread is embedded in the flocked pile member provided on the upper surface of the rotary hook when cutting the thread. Even in this case, the thread hook provided on the thread catcher can lift the lower thread that has entered the pile member, and the raised lower thread can be captured by the thread catcher. The thread and the lower thread can be cut reliably.
請求項２の発明によれば、前記糸捕捉体は布側の上糸及び下糸を捕捉する第１糸捕捉部と、針側の上糸とボビン側の下糸を捕捉する第２糸捕捉部を有し、糸引っ掛け部の下端が第２糸捕捉部の下端よりも低く形成されたので、糸引っ掛け部による下糸の浮き上がらせる効果を高めることができ、その浮き上がらせた下糸を、先ず、第１糸捕捉部よりも下糸のボビン出口側に近い第２糸捕捉部に捕捉させることができ、続けて、第１糸捕捉部にも下糸を捕捉させることができる。その他請求項１と同様の効果を奏する。 According to a second aspect of the present invention, the yarn catcher includes a first yarn catcher that catches the upper thread and lower thread on the fabric side, and a second thread catcher that catches the upper thread on the needle side and the lower thread on the bobbin side. Since the lower end of the yarn hooking portion is formed lower than the lower end of the second yarn catching portion, the effect of raising the lower yarn by the yarn hooking portion can be enhanced. First, the second yarn catching portion closer to the bobbin outlet side of the lower yarn than the first yarn catching portion can be caught, and subsequently, the lower yarn can also be caught by the first yarn catching portion. Other effects similar to those of the first aspect are obtained.
請求項３の発明によれば、前記糸引っ掛け部は第２糸捕捉部に対して糸捕捉体の往動方向下流側に所定距離隔てて糸捕捉体と一体形成され、糸引っ掛け部の下端部は鋭角状に形成され、その鋭角状に形成された先端部が第２糸捕捉部側に向かう方向に設けられたので、糸捕捉体が往動方向に移動する際に、パイル部材に潜り込んだ下糸を糸引っ掛け部の鋭角状先端部で確実に引っ掛けて浮き上がらせることができ、糸捕捉体の復動方向への移動時に、糸引っ掛け部で引っ掛けた下糸を第２糸捕捉部に引き継いで捕捉させることができる。その他請求項２と同様の効果を奏する。 According to the invention of claim 3, the yarn hooking portion is integrally formed with the yarn catching body at a predetermined distance downstream from the second yarn catching portion in the forward movement direction of the yarn catching body, and the lower end portion of the yarn hooking portion. Is formed in an acute angle shape, and the tip portion formed in the acute angle shape is provided in a direction toward the second yarn catching portion side, so that the yarn catching body sinks into the pile member when moving in the forward movement direction. The lower thread can be securely hooked and raised at the sharp tip of the thread hook, and when the thread catcher moves in the backward movement direction, the lower thread hooked by the thread hook is transferred to the second thread catcher. Can be captured. Other effects similar to those of the second aspect are achieved.
請求項４の発明によれば、前記糸引っ掛け部は、糸捕捉体の往動完了時までにパイル部材に潜り込んだ下糸を引っ掛けて浮き上がらせる位置に設けられたので、糸捕捉体を往動方向に移動させる移動途中において、糸引っ掛け部によりパイル部材に潜り込んだ下糸を引っ掛けて浮き上がらせてから捕捉状態に保持でき、しかも糸捕捉体の復動時に糸引っ掛け部で捕捉状態に保持した下糸を第２糸捕捉部に受け渡して捕捉させることができる。その他請求項１〜３の何れかと同様の効果を奏する。 According to the invention of claim 4, since the yarn hooking portion is provided at a position for hooking and lifting the lower thread that has entered the pile member by the time the forward movement of the yarn catcher is completed, the yarn catcher is moved forward. In the middle of movement, the lower thread that has entered the pile member is hooked and lifted by the thread hook, and can be held in the trapped state. The yarn can be transferred to and captured by the second yarn capturing section. Other effects similar to those of any one of claims 1 to 3 are provided.
請求項５の発明によれば、前記糸引っ掛け部から糸捕捉体の基端部に至る糸摺接部は、上糸が摺接して移動可能な直線又は曲線で連続的に繋がる形状であるので、糸捕捉体が往動方向への移動を完了してから、回転釜の回転により上糸が、糸捕捉体に沿うように糸引っ掛け部に移動するに際して、糸捕捉体に連続的に形成された直線又は曲線の糸摺接部を経て糸引っ掛け部に捕捉状態で保持させることができ、糸捕捉体の復動時に、第２糸捕捉部による上糸と下糸の捕捉を何ら支障なく行うことができる。その他請求項１〜４の何れかと同様の効果を奏する。 According to the invention of claim 5, the yarn sliding contact portion from the yarn hooking portion to the base end portion of the yarn catching body has a shape that is continuously connected by a straight line or a curve in which the upper yarn can slide and move. When the upper thread moves to the thread catcher along the thread catcher by the rotation of the rotary hook after the thread catcher has finished moving in the forward movement direction, the thread catcher is continuously formed. The thread catching portion can be held in a trapped state via a straight or curved thread sliding contact portion, and when the yarn catcher returns, the second thread catching portion catches the upper thread and the lower thread without any trouble. be able to. Other effects similar to those of any one of claims 1 to 4 can be achieved.
本実施形態におけるミシンの糸切り装置は、回転釜の内釜上面に設けた植毛状のパイル部材に下糸が潜り込んだ場合でも、糸捕捉体に設けた糸引っ掛け部でその下糸を引っ掛けて浮き上がらせてから、糸捕捉体で捕捉できるようにしてある。 The thread cutting device of the sewing machine according to the present embodiment hooks the lower thread with the thread hooking portion provided in the thread catcher even when the lower thread enters the flocked pile member provided on the upper surface of the inner hook of the rotary hook. After being lifted up, it can be caught by the yarn catcher.
図１に示すように、ミシン１は、水平面を有するベッド部２と、ベッド部２の右部から上方に立設された脚柱部３と、脚柱部３からベッド部２に対向するように水平に延びるアーム部４等から構成されている。 As shown in FIG. 1, the sewing machine 1 has a bed portion 2 having a horizontal plane, a pedestal column portion 3 erected upward from the right portion of the bed portion 2, and the pedestal column portion 3 so as to face the bed portion 2. The arm portion 4 extends horizontally.
アーム部４にタッチパネル付きの液晶ディスプレイ５が設けられ、縫製する模様を表示により選択できるようになっている。アーム部４内の左端部には、図示しない針棒駆動機構、押え足駆動機構、天秤駆動機構、糸通し機構等が設けられている。 The arm portion 4 is provided with a liquid crystal display 5 with a touch panel, and a pattern to be sewn can be selected by display. A needle bar drive mechanism, a presser foot drive mechanism, a balance drive mechanism, a threading mechanism and the like (not shown) are provided at the left end portion in the arm portion 4.
ベッド部２の内部に左右方向向きの下軸６が配設され、ミシン機枠（図示略）に回転可能に枢支されている。下軸６の左端部分に、送り歯７を前後方向及び上下方向に駆動させる送り歯駆動機構（図示略）、水平回転釜８、上糸３１及び下糸３０を切断するための糸切り装置１０、送り歯７を沈下位置に保持するように切換える送り歯沈下機構（図示略）等が設けられている。 A lower shaft 6 facing in the left-right direction is disposed inside the bed portion 2, and is pivotally supported by a sewing machine frame (not shown). A feed dog drive mechanism (not shown) for driving the feed dog 7 in the front-rear direction and the up-down direction, a horizontal rotary hook 8, an upper thread 31, and a lower thread 30 are cut at the left end portion of the lower shaft 6. A feed dog subsidence mechanism (not shown) for switching the feed dog 7 so as to be held at the subsidence position is provided.
水平回転釜８の上側に対応するベッド部２に針板９が配設され、この針板９には、上下動する縫針（図示略）の通過を許容する針穴９ａ（図２参照）が形成されている。送り歯７には、縫針の上下動を許容するための開口部７ａが形成されている。 A needle plate 9 is disposed on the bed portion 2 corresponding to the upper side of the horizontal rotary hook 8, and the needle plate 9 has a needle hole 9a (see FIG. 2) that allows a sewing needle (not shown) to move up and down. Is formed. The feed dog 7 is formed with an opening 7a for allowing the sewing needle to move up and down.
次に、ベッド部２の左端部に設けられた糸切り装置１０について説明する。糸切り装置１０は、ベース上板１１及びベース下板１２によりユニット化されており、水平回転釜８の直ぐ左側に配設されている。 Next, the thread trimming device 10 provided at the left end of the bed 2 will be described. The thread trimming device 10 is unitized by a base upper plate 11 and a base lower plate 12, and is disposed immediately to the left of the horizontal rotary hook 8.
図２に示すように、ベース上板１１には、左右方向向きの貫通長穴１１ａが形成され、ベース上板１１の上面の貫通長穴１１ａの周囲に、薄板状で樹脂製のガイド部材１３が複数箇所で固着されている。また、ガイド部材１３の前側の右端部に、後述する糸捕捉体１５と協働して上糸３１と下糸３０を切断する左右方向向きに配設された切断刃１４の下端部が固着されている。この切断刃１４の刃部は右側端部である。 As shown in FIG. 2, the base upper plate 11 has through-holes 11 a extending in the left-right direction. A thin plate-shaped resin guide member 13 is formed around the through-holes 11 a on the upper surface of the base upper plate 11. Are fixed at multiple locations. Further, the lower end portion of the cutting blade 14 disposed in the left-right direction for cutting the upper yarn 31 and the lower yarn 30 in cooperation with the yarn catcher 15 described later is fixed to the right end portion on the front side of the guide member 13. ing. The blade portion of the cutting blade 14 is the right end portion.
ガイド部材１３の上面側には、糸捕捉体１５（図８−１参照）が左右方向向きに配置され、その糸捕捉体１５の基端部に形成された水平状の駆動部１５ａに設けられた下向きの２本のガイドピン１６，１７が貫通長穴１１ａに移動可能に内嵌されている。 On the upper surface side of the guide member 13, a thread catcher 15 (see FIG. 8A) is disposed in the left-right direction, and is provided in a horizontal drive unit 15 a formed at the base end of the thread catcher 15. Further, two downwardly directed guide pins 16 and 17 are fitted in the through-hole 11a so as to be movable.
図８−２に示すように、糸捕捉体１５の直線状で且つ断面門形である捕捉本体部１５ｂの先端部に、布側の上糸３１及び下糸３０を捕捉する第１糸捕捉部１５ｅと、針側の上糸３１と下糸ボビン２６側の下糸３０を捕捉する第２糸捕捉部１５ｆとが夫々形成されている。即ち、捕捉本体部１５ｂの後側縦壁１５ｃの先端部に第１糸捕捉部１５ｅが形成され、捕捉本体部１５ｂの前側縦壁１５ｄの先端部に第２糸捕捉部１５ｆが、第１糸捕捉部１５ｅに対して所定寸法だけ糸捕捉体１５の往動方向ＦＤ下流側に形成されている。 As shown in FIG. 8-2, the first yarn catching portion that catches the upper thread 31 and the lower yarn 30 on the cloth side at the front end portion of the catching body portion 15 b that is linear and has a cross-sectional gate shape of the yarn catching body 15. 15e and a second thread catching portion 15f for catching the needle-side upper thread 31 and the lower thread bobbin 26-side lower thread 30 are formed. That is, the first yarn catching portion 15e is formed at the front end portion of the rear vertical wall 15c of the catching main body portion 15b, and the second yarn catching portion 15f is placed at the front end portion of the front vertical wall 15d of the catching main body portion 15b. A predetermined dimension is formed on the downstream side in the forward movement direction FD of the yarn catcher 15 with respect to the catcher 15e.
前述した断面門形である捕捉本体部１５ｂは、図５，図６に示すように、ガイド部材１３に固着された切断刃１４に対して上方から覆い被さるような位置に配設されており、糸捕捉体１５が、ベース上板１１の貫通長穴１１ａに沿って左右方向に往復移動する際に、捕捉本体部１５ｂ内側部は切断刃１４とは接触しない状態で往復移動する。 As shown in FIGS. 5 and 6, the capturing main body portion 15 b having the above-described cross-sectional gate shape is disposed at a position so as to cover the cutting blade 14 fixed to the guide member 13 from above. When the yarn catcher 15 reciprocates in the left-right direction along the through long hole 11 a of the base upper plate 11, the catch body 15 b inner side reciprocates without contacting the cutting blade 14.
このように、糸捕捉体１５が往復移動することにより、下糸３０と上糸３１とが捕捉された後、切断刃１４により切断される。第１糸捕捉部１５ｅの往動方向ＦＤの先端部には、傾斜端部が突出状に形成され、糸捕捉体１５が往動方向への移動時に下糸３０を乗り越え易くなっている。 In this way, the yarn catching body 15 reciprocates, whereby the lower yarn 30 and the upper yarn 31 are caught and then cut by the cutting blade 14. An inclined end portion is formed in a protruding shape at the front end portion of the first yarn catching portion 15e in the forward movement direction FD, so that the yarn catcher 15 can easily get over the lower yarn 30 when moving in the forward movement direction.
ところで、図８−２に示すように、前側縦壁１５ｄの第２糸捕捉部１５ｆに対して、糸捕捉体１５の往動方向ＦＤ下流側に所定距離隔てて糸引っ掛け部１５ｇが糸捕捉体１５と一体形成されている。更に、この糸引っ掛け部１５ｇから捕捉本体部１５ｂの基端部に至る糸摺接部１５ｈが連続的に繋がる形状で形成され、しかも糸引っ掛け部１５ｇの下端が第２糸捕捉部１５ｆの下端よりも所定寸法ｔだけ低く形成され、更に、糸引っ掛け部１５ｇの第２糸捕捉部１５ｆ側に向かう下端部が鋭角状に形成されたものである。 By the way, as shown in FIG. 8B, the yarn catching portion 15g is separated from the second yarn catching portion 15f of the front vertical wall 15d by a predetermined distance downstream in the forward movement direction FD of the yarn catching body 15. 15 is integrally formed. Further, the yarn sliding contact portion 15h extending from the yarn hooking portion 15g to the base end portion of the catching main body portion 15b is formed in a continuous shape, and the lower end of the yarn hooking portion 15g is lower than the lower end of the second yarn catching portion 15f. Is also formed lower by a predetermined dimension t, and the lower end portion of the yarn hooking portion 15g toward the second yarn catching portion 15f is formed in an acute angle shape.
図５，図６に示すように、糸切断用モータ１８がベース下板１２の下面にビスで固定され、そのモータ軸に固定された駆動ギヤ２０がベース下板１２の上側に位置している。その駆動ギヤ２０に、樹脂製の伝達ギヤ２１の大径ギヤ２１ａが噛合している。 As shown in FIGS. 5 and 6, the thread cutting motor 18 is fixed to the lower surface of the base lower plate 12 with screws, and the drive gear 20 fixed to the motor shaft is located above the base lower plate 12. . The drive gear 20 is meshed with a large-diameter gear 21 a of a resin transmission gear 21.
一方、図２，図３に示すように、ベース上板１１の下側に配設された扇形ギヤ２３がその基端部において、ベース上板１１に固着した鉛直向きの支持ピン２４で回動可能に枢支され、その扇形ギヤ２３と、大径ギヤ２１ａと一体形成された小径ギヤ２１ｂとが噛合している。 On the other hand, as shown in FIGS. 2 and 3, the fan-shaped gear 23 disposed on the lower side of the base upper plate 11 is rotated at the base end portion thereof by the vertical support pins 24 fixed to the base upper plate 11. The fan-shaped gear 23 that is pivotally supported is meshed with the small-diameter gear 21b that is integrally formed with the large-diameter gear 21a.
その支持ピン２４には揺動レバー２５の基端部が回動可能に枢支され、これら扇形ギヤ２３と揺動レバー２５とが連結ピン２５ａで一体的に固定されている。それ故、伝達ギヤ２１の回転により扇形ギヤ２３と揺動レバー２５とが一体に揺動する。その揺動レバー２５の先端側部分（後端側部分）に長穴２５ｂが形成され、糸捕捉体１５の左側のガイドピン１６がその長穴２５ｂに嵌め込まれている。 A base end portion of the swing lever 25 is pivotally supported on the support pin 24, and the sector gear 23 and the swing lever 25 are integrally fixed by a connecting pin 25a. Therefore, the sector gear 23 and the swing lever 25 swing together as the transmission gear 21 rotates. A long hole 25b is formed in the front end side portion (rear end side portion) of the swing lever 25, and the guide pin 16 on the left side of the yarn catcher 15 is fitted in the long hole 25b.
糸切断用モータ１８が平面視にて時計回りに回転すると、駆動ギヤ２０と扇形ギヤ２３と揺動レバー２５を介して、糸捕捉体１５が長穴２５ｂでガイドされながら、図１２−１に示す最大往動位置まで往動方向ＦＤに移動する。反対に、糸切断用モータ１８が反時計回りに回転すると、糸捕捉体１５が長穴２５ｂでガイドされながら、図２に示す待機位置まで復動方向ＲＤ（往動方向ＦＤ方向と反対方向）に移動する。 When the thread cutting motor 18 rotates clockwise in a plan view, the thread catching body 15 is guided by the elongated hole 25b through the drive gear 20, the fan-shaped gear 23, and the swing lever 25, as shown in FIG. It moves in the forward movement direction FD to the maximum forward movement position shown. On the other hand, when the yarn cutting motor 18 rotates counterclockwise, the backward direction RD (the direction opposite to the forward direction FD) is reached to the standby position shown in FIG. Move to.
ところで、前述した水平回転釜８の内釜８ａの上面であって、送り歯７の最前端に隣接する下糸３０の糸道経路に対応する部位、つまり内釜８ａに収容された下糸ボビン２６から繰り出された下糸３０が送り歯７を経て針板９の針穴９ａに至る糸道経路には、図２，図９に示すように、所定長さの多数の毛を密集状に植毛した平面視にて矩形状のパイル部材２８が接着固定されている。このパイル部材２８は、内釜８ａから外れた上糸３１ループの天秤による糸引き上げに際して、上糸３１の捩じれを防止する為のものである。 By the way, the lower thread bobbin accommodated in the upper surface of the inner hook 8a of the horizontal rotary hook 8 described above and corresponding to the thread path of the lower thread 30 adjacent to the foremost end of the feed dog 7, that is, the inner hook 8a. As shown in FIGS. 2 and 9, a large number of bristles of a predetermined length are densely packed in the thread path of the lower thread 30 fed from 26 through the feed dog 7 to the needle hole 9 a of the needle plate 9. A rectangular pile member 28 is bonded and fixed in a plan view after planting. The pile member 28 is for preventing the upper thread 31 from being twisted when the upper thread 31 loop removed from the inner hook 8a is pulled up by a balance.
それ故、送り歯７が上下動する通常の縫製時には、下糸３０はパイル部材２８に潜り込むようなことがなく、パイル部材２８の表面近くを移動するようになっている。しかし、送り歯沈下機構により送り歯７がその沈下位置に保持されるような縫製時においては、下糸ボビン２６から繰り出された下糸３０が送り歯７の下側により常にパイル部材２８に押えられた状態であるため、下糸ボビン２６からの下糸３０がパイル部材２８の内部にまで潜り込んだ状態で繰り出されるようになる。 Therefore, during normal sewing in which the feed dog 7 moves up and down, the lower thread 30 does not sink into the pile member 28 but moves near the surface of the pile member 28. However, at the time of sewing in which the feed dog 7 is held in its lowered position by the feed dog lowering mechanism, the lower thread 30 fed from the lower thread bobbin 26 is always pressed against the pile member 28 by the lower side of the feed dog 7. Therefore, the lower thread 30 from the lower thread bobbin 26 is fed out in a state where it has entered the inside of the pile member 28.
次に、糸切断時における糸捕捉体１５の作用及び効果について説明する。但し、この場合には、送り歯沈下機構により送り歯７が沈下位置に保持されているものとする。それ故、下糸ボビン２６からの下糸３０は、図１０，図１１−２に示すように、送り歯７の沈下状態によりパイル部材２８に潜り込んだ状態を経て繰り出される。 Next, the operation and effect of the yarn catcher 15 at the time of yarn cutting will be described. In this case, however, it is assumed that the feed dog 7 is held at the sink position by the feed dog sinking mechanism. Therefore, as shown in FIGS. 10 and 11-2, the lower thread 30 from the lower thread bobbin 26 is fed out through a state where the lower thread 30 sinks into the pile member 28 due to the subsidence state of the feed dog 7.
このように、送り歯７による布送りが実行されない縫製作業中において、糸捕捉体１５は図２に示す待機位置で待機している。縫製終了に伴う糸切断に際して、前述したように、糸切断用モータ１８の時計回りの回転により、糸捕捉体１５が往動方向ＦＤに移動する（図１１−１，図１１−２参照）。 Thus, during the sewing operation in which the cloth feed by the feed dog 7 is not executed, the thread catcher 15 is waiting at the standby position shown in FIG. At the time of thread cutting at the end of sewing, as described above, the thread catching body 15 moves in the forward movement direction FD by the clockwise rotation of the thread cutting motor 18 (see FIGS. 11-1 and 11-2).
糸捕捉体１５の往動方向ＦＤへの往動完了までの途中部において、図１２−１，図１２−２に示すように、第１糸捕捉部１５ｅと第２糸捕捉部１５ｆがパイル部材２８に潜り込んだ下糸３０を乗り越えるが、糸引っ掛け部１５ｇの下端が第２糸捕捉部１５ｆの下端よりも低く形成され、しかも糸引っ掛け部１５ｇの第２糸捕捉部１５ｆ側の下端部が鋭角状に形成されているため、下糸３０がパイル部材２８に潜り込んでいても、糸引っ掛け部１５ｇがその潜り込んでいる下糸３０よりも下側まで延びているため、糸引っ掛け部１５ｇの鋭角状の先端部で潜り込んだ下糸３０を確実に引っ掛けて浮き上がらせる。 As shown in FIGS. 12A and 12B, the first yarn catching portion 15e and the second yarn catching portion 15f are pile members in the middle of the yarn catching body 15 until the forward movement in the forward movement direction FD is completed. 28, the lower end of the yarn hooking portion 15g is formed lower than the lower end of the second yarn catching portion 15f, and the lower end portion of the yarn hooking portion 15g on the second yarn catching portion 15f side is an acute angle. Therefore, even if the lower thread 30 is submerged in the pile member 28, the thread hooking portion 15g extends below the submerged lower thread 30. Therefore, the acute angle of the thread hooking portion 15g is increased. The lower thread 30 that has entered the tip of the thread is securely hooked and lifted.
このときには、上糸３１は水平回転釜８の外釜８ｂに有する剣先（図示略）に捕捉されていない。そこで、糸捕捉体１５は、復動方向ＲＤに所定距離だけ復動し、糸引っ掛け部１５ｇに捕捉状態で保持された下糸３０は第２糸捕捉部１５ｆに引き継いで捕捉されてから、糸捕捉体１５は水平回転釜８の中央付近で一時的に停止する。 At this time, the upper thread 31 is not captured by the sword (not shown) provided in the outer hook 8 b of the horizontal rotary hook 8. Therefore, the yarn catching body 15 moves backward by a predetermined distance in the backward movement direction RD, and the lower yarn 30 held in the catching state by the yarn hooking portion 15g is taken over by the second yarn catching portion 15f and then caught. The capturing body 15 temporarily stops near the center of the horizontal rotary hook 8.
このように、糸捕捉体１５の停止中に、剣先の反時計方向への回転により、剣先に引っ掛けられた上糸３１が糸捕捉体１５の糸摺接部１５ｈに摺接しながら先端部に移動し（図１２−２参照）、糸引っ掛け部１５ｇに捕捉状態に保持される。 Thus, while the yarn catcher 15 is stopped, the upper thread 31 hooked on the tip of the sword moves to the tip end while sliding on the yarn slide contact portion 15h of the yarn catcher 15 due to the counterclockwise rotation of the sword tip. (See FIG. 12-2), and is held in the trapped state by the yarn hooking portion 15g.
この時点で糸切断用モータ１８の駆動により糸捕捉体１５が再び復動方向ＲＤに復動し始めると、図１３−１，図１３−２に示すように、下糸３０と上糸３１とが共に第２糸捕捉部１５ｆと第１糸捕捉部１５ｅとに捕捉された状態で待機位置まで復帰移動する途中において、第１糸捕捉部１５ｅと第２糸捕捉部１５ｆの間の下糸３０と上糸３１が切断刃１４に交差するように接触し、その後、切断刃１４により下糸３０と上糸３１とが同時に切断される。 At this time, when the yarn catching body 15 starts to return again in the backward movement direction RD by driving the yarn cutting motor 18, as shown in FIGS. 13-1 and 13-2, the lower yarn 30 and the upper yarn 31 Both of which are caught by the second yarn catching portion 15f and the first yarn catching portion 15e and returning to the standby position, the lower yarn 30 between the first yarn catching portion 15e and the second yarn catching portion 15f. And the upper thread 31 come into contact with the cutting blade 14, and then the lower thread 30 and the upper thread 31 are simultaneously cut by the cutting blade 14.
このように、水平回転釜８の内釜８ａから外れた上糸ループの天秤による糸引き上げに際して上糸３１の捩じれを防止する為の植毛状のパイル部材２８を内釜８ａの上面に設け、パイル部材２８に潜り込んだ下糸３０を浮き上がらせるための糸引っ掛け部１５ｇを糸捕捉体１５に設けたので、糸切断に際して、下糸３０が水平回転釜８の内釜８ａ上面に設けたパイル部材２８に潜り込んでいるような場合でも、糸捕捉体１５に設けた糸引っ掛け部１５ｇにより、パイル部材２８に潜り込んだ下糸３０を浮き上がらせることができ、その浮き上がった下糸３０を糸捕捉体１５で捕捉できるため、切断刃１４との協働で下糸３０と上糸３１とを確実に切断することができる。 Thus, a flocked pile member 28 is provided on the upper surface of the inner hook 8a to prevent the upper thread 31 from being twisted when the upper thread loop is lifted by the balance of the upper thread loop removed from the inner hook 8a of the horizontal rotary hook 8. Since the thread catching portion 15g for lifting the lower thread 30 that has entered the member 28 is provided in the thread catcher 15, the pile member 28 provided on the upper surface of the inner hook 8a of the horizontal rotary hook 8 when the thread is cut. Even when the yarn catches in the pile member 28, the yarn catching portion 15 g provided in the yarn catcher 15 can lift the lower thread 30 that has entered the pile member 28, and the lower catcher 30 lifted up by the yarn catcher 15. Since it can be captured, the lower thread 30 and the upper thread 31 can be reliably cut in cooperation with the cutting blade 14.
また、糸捕捉体１５は布側の上糸３１及び下糸３０を捕捉する第１糸捕捉部１５ｅと、針側の上糸３１とボビン側の下糸３０を捕捉する第２糸捕捉部１５ｆを有し、糸引っ掛け部１５ｇの下端が第２糸捕捉部１５ｆの下端よりも低く形成されたので、糸引っ掛け部１５ｇによる下糸３０の浮き上がらせ効果を高めることができ、その浮き上がらせた下糸３０を、先ず、第１糸捕捉部１５ｅよりも下糸３０の下糸ボビン２６出口側に近い第２糸捕捉部１５ｆに捕捉させることができ、続けて、第１糸捕捉部１５ｅにも下糸３０を捕捉させることができる。 The yarn catcher 15 includes a first yarn catcher 15e that catches the upper thread 31 and the lower thread 30 on the cloth side, and a second yarn catcher 15f that catches the upper thread 31 on the needle side and the lower thread 30 on the bobbin side. Since the lower end of the yarn hooking portion 15g is formed lower than the lower end of the second yarn catching portion 15f, the lowering effect of the lower yarn 30 by the yarn hooking portion 15g can be enhanced, and the lower First, the thread 30 can be captured by the second thread capturing section 15f closer to the lower thread bobbin 26 outlet side of the lower thread 30 than the first thread capturing section 15e, and then also to the first thread capturing section 15e. The lower thread 30 can be captured.
また、糸引っ掛け部１５ｇは第２糸捕捉部１５ｆに対して糸捕捉体１５の往動方向ＦＤ下流側に所定距離隔てて糸捕捉体１５と一体形成され、糸引っ掛け部１５ｇの下端部は鋭角状に形成され、その鋭角状に形成された先端部が第２糸捕捉部１５ｆ側に向かう方向に設けられたので、糸捕捉体１５が往動方向に移動する際に、パイル部材２８に潜り込んだ下糸３０を糸引っ掛け部１５ｇの鋭角状先端部で確実に引っ掛けて浮き上がらせることができ、糸捕捉体１５の復動方向への移動時に、糸引っ掛け部１５ｇで引っ掛けた下糸３０を第２糸捕捉部１５ｆに引き継いで捕捉させることができる。 Further, the yarn hooking portion 15g is integrally formed with the yarn catching body 15 at a predetermined distance from the second yarn catching portion 15f on the downstream side in the forward movement direction FD of the yarn catching body 15, and the lower end portion of the yarn hooking portion 15g has an acute angle. Since the tip portion formed in the shape of an acute angle is provided in the direction toward the second yarn catching portion 15f side, the yarn catching body 15 sinks into the pile member 28 when moving in the forward movement direction. The lower thread 30 can be reliably hooked and lifted by the sharp-angled tip of the thread hooking portion 15g, and the lower thread 30 hooked by the thread hooking portion 15g is moved to the first position when the thread catcher 15 moves in the backward movement direction. The two yarn catcher 15f can take over and take over.
また、糸引っ掛け部１５ｇは、糸捕捉体１５の往動完了時までにパイル部材２８に潜り込んだ下糸３０を引っ掛けて浮き上がらせる位置に設けられたので、糸捕捉体１５を往動方向に移動させる移動途中において、糸引っ掛け部１５ｇによりパイル部材２８に潜り込んだ下糸３０を引っ掛けて浮き上がらせてから捕捉状態に保持でき、しかも糸捕捉体１５の復動時に糸引っ掛け部１５ｇで捕捉状態に保持した下糸３０を第２糸捕捉部１５ｆに受け渡して捕捉させることができる。 Further, since the yarn hooking portion 15g is provided at a position where the lower yarn 30 that has entered the pile member 28 is hooked and lifted up until the forward movement of the yarn catcher 15 is completed, the yarn catcher 15 is moved in the forward movement direction. During the movement, the lower thread 30 that has entered the pile member 28 is hooked and lifted by the thread hooking portion 15g and can be held in the trapped state, and is held in the trapped state by the thread hooking portion 15g when the yarn trapping body 15 is moved back. The lower thread 30 can be transferred to and captured by the second thread capturing portion 15f.
更に、糸引っ掛け部１５ｇから糸捕捉体１５の基端部に至る糸摺接部１５ｈは、上糸３１が摺接して移動可能な直線で連続的に繋がる形状であるので、糸捕捉体１５が往動方向への移動を完了してから、水平回転釜８の回転により上糸３１が、糸捕捉体１５に沿うように糸引っ掛け部１５ｇに移動するに際して、糸捕捉体１５に連続的に形成された直線の糸摺接部１５ｈを経て糸引っ掛け部１５ｇに捕捉状態で保持させることができ、糸捕捉体１５の復動時に、第２糸捕捉部１５ｆによる下糸３０と上糸３１の捕捉を何ら支障なく行うことができる。 Further, the yarn sliding contact portion 15h from the yarn hooking portion 15g to the base end portion of the yarn catching body 15 has a shape that is continuously connected by a straight line in which the upper thread 31 can slide and move. After the movement in the forward movement direction is completed, when the upper thread 31 moves to the thread catching portion 15g along the thread catching body 15 by the rotation of the horizontal rotary hook 8, it is continuously formed on the thread catching body 15. The thread catching portion 15g can be held in the trapped state via the straight thread sliding contact portion 15h, and when the yarn trapping body 15 moves backward, the lower thread 30 and the upper thread 31 are trapped by the second thread catching portion 15f. Can be performed without any problems.
次に、前記実施例の変更形態について説明する。 Next, a modified form of the embodiment will be described.
１〕糸捕捉体１５の糸引っ掛け部１５ｇから基端部に至る糸摺接部１５ｈは、上糸３１が摺接して移動可能に湾曲させた曲線で連続的に繋がる形状であってもよい。 1] The yarn sliding contact portion 15h from the yarn hooking portion 15g of the yarn catching body 15 to the base end portion may have a shape that is continuously connected by a curved curve in which the upper yarn 31 is slidable and movable.
２〕下糸３０がパイル部材２８に潜り込む深さは、パイル部材２８に植毛する毛の太さや長さ、密集度合い、パイル部材２８の大きさ等に応じて異なるため、糸引っ掛け部１５ｇの下端を第２糸捕捉部１５ｆの下端より低くする寸法ｔを、潜り込む深さより大きな寸法に適宜設定することが望ましい。 2] The depth at which the lower thread 30 sinks into the pile member 28 varies depending on the thickness and length of the hair to be implanted in the pile member 28, the degree of density, the size of the pile member 28, and the like. It is desirable to appropriately set the dimension t for lowering the lower than the lower end of the second yarn catching portion 15f to a dimension larger than the depth of penetration.
３〕本発明は以上説明した実施例及びその変更形態に限定されるものではなく、当業者であれば、本発明の趣旨を逸脱しない範囲で、前記実施例に種々の変更を付加して実施することができ、本発明はそれらの変更形態をも包含するものである。 3) The present invention is not limited to the above-described embodiments and modifications thereof, and those skilled in the art can implement various modifications to the above embodiments without departing from the spirit of the present invention. The present invention includes such modifications.
１ ミシン
８ 水平回転釜
８ａ 内釜
９ 針板
１０ 糸切り装置
１４ 切断刃
１５ 糸捕捉体
１５ｅ 第１糸捕捉部
１５ｆ 第２糸捕捉部
１５ｇ 糸引っ掛け部
１５ｈ 糸摺接部
２８ パイル部材
３０ 下糸
３１ 上糸
２６ 下糸ボビン
DESCRIPTION OF SYMBOLS 1 Sewing machine 8 Horizontal rotary hook 8a Inner hook 9 Needle plate 10 Thread trimming device 14 Cutting blade 15 Thread catcher 15e First thread catcher 15f Second thread catcher 15g Thread hook 15h Thread sliding contact 28 Pile member 30 Lower thread 31 Upper thread 26 Lower thread bobbin
Claims (5)
前記回転釜の内釜から外れた上糸ループの天秤による糸引き上げに際して上糸の捩じれを防止する為の植毛状のパイル部材を内釜上面に設け、
前記パイル部材に潜り込んだ下糸を浮き上がらせるための糸引っ掛け部を前記糸捕捉体に設けた、
ことを特徴とするミシンの糸切り装置。 A thread trimming device disposed near a rotary hook at a lower side of a needle plate of a sewing machine, and a thread catcher that catches an upper thread and a lower thread extending from a cloth by reciprocation, and a thread catcher In a thread trimmer having a cutting blade for cutting the captured upper thread and lower thread,
A flocked pile member is provided on the upper surface of the inner hook to prevent twisting of the upper thread when the thread is pulled by the balance of the upper thread loop removed from the inner hook of the rotary hook.
A yarn hooking portion for lifting the lower thread that has entered the pile member is provided on the yarn catcher.
A thread trimming device for a sewing machine.
The yarn sliding contact portion from the yarn hooking portion to the base end portion of the yarn catching body has a shape that is continuously connected by a straight line or a curve in which the upper thread is slidable and movable. A thread trimming device for a sewing machine according to any one of the above.
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| JP2004279813A JP4734874B2 (en) | 2004-09-27 | 2004-09-27 | Sewing machine thread trimmer |
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| JP5040696B2 (en) | 2008-02-07 | 2012-10-03 | ブラザー工業株式会社 | Sewing machine thread trimmer |
| JP2014068802A (en) | 2012-09-28 | 2014-04-21 | Brother Ind Ltd | Sewing machine |
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