JP5041284B2 - Sewing machine thread trimmer - Google Patents

Sewing machine thread trimmer Download PDF

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Publication number
JP5041284B2
JP5041284B2 JP2007106527A JP2007106527A JP5041284B2 JP 5041284 B2 JP5041284 B2 JP 5041284B2 JP 2007106527 A JP2007106527 A JP 2007106527A JP 2007106527 A JP2007106527 A JP 2007106527A JP 5041284 B2 JP5041284 B2 JP 5041284B2
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Prior art keywords
thread
looper
knife
movable knife
needle
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JP2008220915A (en
JP2008220915A5 (en
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誠冶 橋本
明夫 彌永
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Yamato Sewing Machine Mfg Co Ltd
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Yamato Sewing Machine Mfg Co Ltd
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Priority to JP2007106527A priority Critical patent/JP5041284B2/en
Priority to TW097107808A priority patent/TWI410546B/en
Priority to KR1020080022514A priority patent/KR101446050B1/en
Priority to CN2008100858233A priority patent/CN101265643B/en
Publication of JP2008220915A publication Critical patent/JP2008220915A/en
Publication of JP2008220915A5 publication Critical patent/JP2008220915A5/ja
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/02—Devices for severing the needle or lower thread controlled by the sewing mechanisms
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B37/00—Devices incorporated in sewing machines for slitting, grooving, or cutting
    • D05B37/04—Cutting devices
    • D05B37/06—Cutting devices with oscillating tools
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B63/00—Devices associated with the loop-taker thread, e.g. for tensioning
    • D05B63/02—Loop-taker thread take-up levers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2205/00—Interface between the operator and the machine
    • D05D2205/32—Safety devices; Security devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2305/00—Operations on the work before or after sewing
    • D05D2305/32—Measuring
    • D05D2305/36—Quality control

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Description

本発明は、例えば偏平縫いミシンや二重環縫いミンンによる所定の縫製動作終了後における針糸及びルーパ糸の切断に用いられるミシンの糸切り装置に関する。詳しくは、先端部に針糸及びルーパ糸を捕捉する糸捕捉部を有し、その糸捕捉部が針板とルーパの間に進出した前進位置と前記ルーパの運動軌跡の後方側に退入した後退位置との間に亘って往復移動可能な可動メスと、この可動メスを前記両位置間に亘って往復駆動移動させる往復揺動式駆動レバーと、所定の縫製動作終了後に前記可動メスが前進位置から後退位置に往行駆動移動するとき、前記糸捕捉部に捕捉された針糸及びルーパ糸を前記可動メスとの協働作用により切断する固定メスと、切断された針糸及びルーパ糸の端部を前記可動メスの先端部との間で弾性挟持する糸挟み板とを具備してなるミシンの糸切り装置に関するものである。The present invention relates to a thread trimming device for a sewing machine used for cutting a needle thread and a looper thread after completion of a predetermined sewing operation using, for example, a flat stitch sewing machine or a double chain stitch sewing machine. For more information, has a thread catching portion for catching the needle thread and looper thread in the tip, room access to the rear side of the advance output and movement trajectory of the forward position and the looper has between its thread catching portion of the needle plate and the looper A movable knife capable of reciprocating between the retracted position, a reciprocating oscillating drive lever for reciprocatingly driving the movable knife between the two positions, and the movable knife after completion of a predetermined sewing operation. A fixed knife that cuts the needle thread and the looper thread captured by the thread trapping portion by a cooperative action with the movable knife, and the cut needle thread and the looper thread when moving forward from the forward position to the backward position. This invention relates to a thread trimming device for a sewing machine comprising a thread pinching plate that elastically clamps the end of the sewing machine between the end of the movable knife and the tip of the movable knife.

上記のように構成されているミシンの糸切り装置においては、縫製動作終了後の糸切断時には被縫製物における針糸及びルーパ糸の残留長さを短くするために、可動メス、固定メス及び糸挟み板を針板及びルーパに対して近接した前方への進出位置に移動させ、かつ、糸切断後の次の縫製動作時には固定メス等がルーパの動作に干渉することを回避するために、該固定メス、可動メス及び糸挟み板を前記糸切断時における進出位置より退避位置に移動させることが必要である。In the thread trimming device of the sewing machine configured as described above, in order to shorten the remaining length of the needle thread and the looper thread in the sewing product when the thread is cut after the sewing operation is finished, the movable knife, the fixed knife and the thread In order to move the pinch plate to the forward advance position close to the needle plate and the looper, and to prevent the fixed knife etc. from interfering with the operation of the looper during the next sewing operation after thread cutting, It is necessary to move the fixed knife, the movable knife and the thread clamp plate from the advanced position at the time of cutting the thread to the retracted position.

かかる糸切断後における後方の退避位置への移動手段として、従来では、可動メス、固定メス及び糸挟み板を保持するメス保持台を、前記可動メスの糸切断のための前進・後退位置間に亘る往復駆動移動経路の延長線に沿わせて直線的又はほぼ直線的に退避位置まで後退移動させるように構成していた（例えば、特許文献１，２参照）。  Conventionally, as a means for moving to the rearward retracted position after the thread cutting, a knife holding base for holding a movable knife, a fixed knife and a thread clamp plate is provided between the forward and backward positions for thread cutting of the movable knife. It has been configured to recede to the retracted position linearly or almost linearly along the extended line of the reciprocating drive movement path (see, for example, Patent Documents 1 and 2).

特開２００５−１６８５６３号公報  JP 2005-168563 A 実公昭６３−１０１４９号公報  Japanese Utility Model Publication No. 63-10149

しかしながら、上記のごとく直線的又はほぼ直線的な後退移動手段が採られていた従来の糸切り装置においては、退避位置に移動されたときでも、図７に示すように、可動メス５０、固定メス５１及び糸挟み板５２（以下、可動メス等と称する場合もある。）の先端部（左端部）がルーパ５３の左右往復運動軌跡（矢印５４で示す）に非常に接近した位置関係にあり、また、可動メス５０の先端部と糸挟み板５２との間に切断端部が弾性挟持されているルーパ糸Ｌがルーパ５３の略直上部に重なる状態で張られているために、ルーパ糸Ｌにより形成されるべき三角エリアが非常に小さくなり、使用する糸の種類によっては次の縫製動作開始時に針（図７では図示省略する。）がルーパ糸Ｌの三角エリアに降下せず、目飛びを発生する可能性があった。However, in the conventional thread trimming apparatus in which the linear or substantially linear backward moving means is employed as described above, even when moved to the retracted position, as shown in FIG. 51 and the thread pinching plate 52 (hereinafter also referred to as a movable knife or the like) are in a positional relationship in which the distal end portion (left end portion) is very close to the left-right reciprocating motion trajectory (indicated by an arrow 54) of the looper 53. Further, since the looper yarn L whose cut end portion is elastically sandwiched between the distal end portion of the movable knife 50 and the yarn pinching plate 52 is stretched in a state of being overlapped with a substantially upper portion of the looper 53, the looper yarn L The triangular area to be formed becomes very small, and depending on the type of thread used, the needle (not shown in FIG. 7) does not drop into the triangular area of the looper thread L when the next sewing operation starts, Can cause Was Tsu.

また、可動メス５０等が退避位置に移動された状態で、ルーパ５３を図８に示すように、それの左右往復運動軌跡５４の最右端に停止させてルーパ先端近くの糸穴５３ａにルーパ糸Ｌを通すとき、その糸穴５３ａが可動メス５０等の先端部と針板５６との間の左右、上下ともに非常に狭くて窮屈な箇所に存在するために、可動メス５０等の先端部や針板５６が障害物となって糸穴５３ａへの糸通し作業がやりずらいという問題もあった。Further, the looper in a state where the movable knife 50 or the like is moved to the retracted position, the looper 53, as shown in FIG. 8, is stopped in the rightmost its lateral reciprocating path 54 to the looper tip near the yarn hole 53a When the thread L is passed, the thread hole 53a is located in a very narrow and cramped portion between the tip of the movable knife 50 and the needle plate 56, and therefore, the tip of the movable knife 50 and the like. There is also a problem that the needle plate 56 becomes an obstacle and the threading operation through the thread hole 53a is difficult.

本発明は上述の実情に鑑みてなされたもので、退避位置に移動させたとき、ルーパ糸により大きな三角エリアを確実に形成させて、該三角エリアに次縫製動作開始時の針を確実に降下させて目飛びの発生を防止することができるとともに、ルーパ糸の糸穴への通し作業も容易に行うことができ、しかも、ガタの発生や局所への負荷負担による破損変形をなくして耐久性の向上も図ることができるミシンの糸切り装置を提供することを目的としている。The present invention has been made in view of the above circumstances, when allowed to move to the retracted position, and reliably to form a large triangular area by the looper thread, the said triangle area reliably needle at the next sewing operation start It can be lowered to prevent the occurrence of stitch skipping, and the looper thread can be easily threaded through the thread hole, and it is durable with no rattling or damage due to local load. It is an object of the present invention to provide a thread trimming device for a sewing machine that can improve the performance.

上記目的を達成するために、本発明に係るミシンの糸切り装置は、先端部に針糸及びルーパ糸を捕捉する糸捕捉部を有し、その糸捕捉部が針板とルーパの間に進出した前進位置と前記ルーパの運動軌跡の後方側に退入した後退位置との間に亘って往復移動可能な可動メスと、この可動メスを前記両位置間に亘って往復駆動移動させる往復揺動式駆動レバーと、所定の縫製動作終了後に前記可動メスが前進位置から後退位置に復行駆動移動するとき、前記糸捕捉部に捕捉された針糸及びルーパ糸を前記可動メスとの協働作用により切断する固定メスと、切断された針糸及びルーパ糸の端部を前記可動メスの先端部との間で弾性挟持する糸挟み板とを具備してなるミシンの糸切り装置において、装置取付台には、前記可動メス、固定メス及び糸挟み板を保持するメス保持台を前記針板及びルーパに対して近接した前方への進出位置とそれよりも斜め後方への退避位置との間で揺動変位させることが可能な長短二つの揺動リンクからなる四連リンク機構が設けられており、前記可動メスと固定メスとの協働作用による糸切断後における前記駆動レバーの更なる復行揺動時に該駆動レバーが前記四連リンク機構の長い揺動リンクに当接して該四連リンク機構が同期作動され前記メス保持台を前記進出位置から退避位置に揺動変位させるように構成されていることを特徴としている。In order to achieve the above object, a thread trimming device for a sewing machine according to the present invention has a yarn catching portion for catching a needle thread and a looper yarn at the tip, and the yarn catching portion advances between a needle plate and a looper. a movable knife that can reciprocate over between the advanced position and a retracted position retracts to the rear side of the moving path of the looper, and a reciprocating swinging reciprocating drive moves across the movable knife between the two positions When the movable knife moves backward from the forward movement position to the backward movement position after the end of a predetermined sewing operation, the needle thread and the looper thread captured by the thread capturing section cooperate with the movable knife. In a thread trimming device for a sewing machine, comprising: a fixed knife that cuts by a needle; and a thread pinching plate that elastically clamps the end of the cut needle thread and looper thread between the tip of the movable knife. The stand has the movable knife, fixed knife and thread clamp. Two long and short swings that can swing and displace the knife holding base for holding the plate between a forward advance position close to the needle plate and the looper and a retreat position obliquely rearward than that. A quadruple link mechanism comprising a link is provided, and when the drive lever further swings backward after the yarn is cut by the cooperative action of the movable knife and the fixed knife, the drive lever The four-link mechanism is operated in synchronization with a long rocking link so that the knife holding base is rocked and displaced from the advanced position to the retracted position.

上記のごとき特徴構成を有する本発明に係るミシンの糸切り装置によれば、所定の縫製動作後における往復揺動式駆動レバーの揺動を介して前進位置から後退位置へ復行駆動移動される可動メスと固定メスとの協働作用により針糸及びルーパ糸を切断した後、前記駆動レバーの更なる復行揺動に同期して四連リンク機構が作動することになり、これによって、メス保持台を介して糸切断後の可動メス、固定メス及び糸挟み板を針板及びルーパに対して斜め後方の退避位置に揺動変位、すなわち、針板及びルーパに対して斜め後方位置にオフセットさせることができる。したがって、糸切断後に可動メスの先端部と糸挟み板との間に端部が弾性挟持されているルーパ糸がルーパの略直上部に重なることなく、ルーパと糸挟み板との間に亘り斜めに張られた状態となるために、ルーパ糸により大きな三角エリアを確実に形成することができ、使用する糸の種類等に関係なく、次の縫製動作開始時には針をルーパ糸の三角エリアに確実に降下させて目飛びの発生を確実に防止し所定通りの良好な縫製を行うことができる。  According to the thread trimming device of the sewing machine according to the present invention having the above-described characteristic configuration, the reverse drive is moved from the forward position to the reverse position through the swing of the reciprocating swing drive lever after a predetermined sewing operation. After the needle thread and the looper thread are cut by the cooperative action of the movable knife and the fixed knife, the four-link mechanism is operated in synchronization with the further backward swing of the drive lever. The movable knife, fixed knife and thread clamp plate after thread cutting through the holding base are swung to the retracted position obliquely backward with respect to the needle plate and looper, that is, offset to the obliquely backward position with respect to the needle plate and looper. Can be made. Therefore, the looper thread whose end is elastically sandwiched between the tip of the movable knife and the thread clamp plate after thread cutting does not overlap the looper substantially directly above the looper, and is slanted between the looper and the thread clamp plate. Therefore, it is possible to reliably form a large triangular area with the looper thread, and to ensure that the needle is in the triangular area of the looper thread at the start of the next sewing operation, regardless of the type of thread used. It is possible to reliably prevent the occurrence of stitch skipping and to perform good sewing as prescribed.

また、前記可動メス、固定メス及び糸挟み板の先端部が針板及びルーパに対してオフセットされてルーパの糸穴周辺には左右、上下に十分に広いスペースを確保することができるために、その糸穴へのルーパ糸の通し作業を、針板や可動メス等に邪魔されることなく非常に容易に行うことができる。  In addition, because the movable knife, the fixed knife and the tip of the thread clamp plate are offset with respect to the needle plate and the looper, a sufficiently wide space can be secured around the thread hole of the looper on the left and right and up and down. The operation of passing the looper thread through the thread hole can be performed very easily without being interrupted by the needle plate, the movable knife, or the like.

しかも、メス保持台の斜め後方の退避位置へのオフセット移動に長短二つの揺動リンクからなる四連リンク機構を用いているので、長孔とこれに係合するネジとの摺動による案内作用でオフセット移動させるように構成する場合に比べて、ガタ付きの発生が非常に少ないとともに、ネジなどの摺動案内部品に集中的に過負荷が掛ってそれが破損したり、変形したりするおそれも非常に少なくなり、可動構成要素を含めて装置全体の耐久性の向上並びに切断後の糸端の弾性挟持機能の安定化を図ることができるという効果を奏する。  In addition, since the quadruple link mechanism consisting of two long and short rocking links is used for offset movement to the retracted position obliquely rearward of the knife holder, the guiding action by sliding between the long hole and the screw engaged therewith Compared to the case of offset movement, the occurrence of backlash is very small, and the sliding guide parts such as screws are overloaded and may be damaged or deformed. As a result, the durability of the entire apparatus including the movable component can be improved, and the elastic pinching function of the thread end after cutting can be stabilized.

本発明に係るミシンの糸切り装置において、前記四連リンク機構の長い揺動リンクの中間部位と前記装置取付台との間に、前記メス保持台の前記進出位置への揺動変位をストップし、かつ、そのストップ位置を調節可能としたストッパー機構を設ける場合は（請求項２）、進出位置に進出した前記可動メス等のルーパに対する位置を確実に規定し、かつ、摩耗などが生じた場合の調整を容易に行うことができる。Oite the thread cutting device of a sewing machine according to the present invention, between the intermediate portion of the long swing link of the quadruplicate link mechanism and the device mount, the swinging displacement to the advanced position of the female holder When providing a stopper mechanism that stops and allows adjustment of the stop position (Claim 2), the position of the movable knife or the like that has advanced to the advance position is reliably defined, and wear or the like occurs. Adjustment can be easily performed.

また、本発明に係るミシンの糸切り装置において、前記四連リンク機構の短い揺動リンクのメス保持台への枢支部には、前記メス保持台の針板及びルーパに対する前後位置を調節可能なエキセンスペーサーを介在させる場合は（請求項３）、針板及びルーパに対する可動メス等の先端部の進出位置及び退避位置を簡単に調整して、所定の糸切断性能及び糸端挟持性能が常に確実かつ安定よく発揮される状態で使用することができる。Further, Oite the thread cutting device of a sewing machine according to the present invention, wherein the pivot portion of the female holder of a short swing link of quadruplicate link mechanism, adjust the position before and after with respect to the female holder of the needle plate and the looper When a possible eccentric spacer is interposed (Claim 3), the advancing position and the retracting position of the tip of the movable knife or the like with respect to the needle plate and the looper can be easily adjusted to achieve a predetermined thread cutting performance and thread end clamping performance. It can be used in a state where it is always exerted reliably and stably.

以下、本発明の実施の形態を図面にもとづいて説明する。
図１は本発明に係るミシンの糸切り装置４０を構成する構成部品の分解斜視図、図２は同糸切り装置４０の構成部品が組付けられた状態の要部の平面図であり、該糸切り装置４０は、縫製作業者側からみて、針落ち部３１を有する針板（周知であるため、図示は省略する。）及びその針板の下方において平面視でループ状の運動軌跡３２（図５参照）を描くように左右に往復揺動運動するルーパ３３の右側に配置され装置取付台１を介してミシンベッド部（図示省略する。）の内部に固定されている。Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of components constituting a thread trimming device 40 of a sewing machine according to the present invention, and FIG. 2 is a plan view of a main part in a state where the components of the thread trimming device 40 are assembled. The thread trimming device 40 is viewed from the side of the sewing manufacturer, and includes a throat plate having a needle drop portion 31 (which is well known and not shown), and a loop-like movement locus 32 (in a plan view) below the throat plate ( As shown in FIG. 5, it is arranged on the right side of the looper 33 that reciprocally swings left and right, and is fixed to the inside of the sewing machine bed (not shown) via the device mounting base 1.

前記糸切り装置４０は、先端部に針糸及びルーパ糸Ｌ（図５参照）を捕捉するフック状の糸捕捉部２ａを有し、この糸捕捉部２ａが針板とルーパ３３の間に進出した図３に示す前進位置と前記ルーパ３３の運動軌跡３２の右方（後方）側に退入した図２に示す後退位置との間に亘って矢印ａ−ｂで示す左右方向に往復移動可能な可動メス２と、前記装置取付台１に段ネジ３を介して長手方向中間部が枢支され、その長手方向一端部に連結のシリンダ等の伸縮駆動源（図示省略する。）を介して前記段ネジ３の軸心を支点として矢印ｃ−ｄで示す左右方向に往復駆動揺動可能で、その往復駆動揺動により前記可動メス２を前記両位置間に亘って往復駆動移動させる往復揺動式駆動レバー４と、所定の縫製動作終了後に前記可動メス２が図３の前進位置から図２の後退位置に復行駆動移動するとき、前記糸捕捉部２ａに捕捉された針糸及びルーパ糸Ｌを可動メス２との協働作用により切断する固定メス５と、切断された針糸及びルーパ糸Ｌの端部を前記可動メス２の先端部との間で弾性挟持する糸挟み板６と、この糸挟み板６の先端部を前記可動メス２側に弾性的に押圧する糸挟み板押しバネ７と、この糸挟み板押しバネ７の下部に配置された糸挟み板押しバネ調節片８等を具備している。The thread trimming device 40 has a hook-shaped thread catching portion 2a for catching a needle thread and a looper thread L (see FIG. 5) at the tip, and this thread catching portion 2a advances between the needle plate and the looper 33. 3 can be reciprocated in the left-right direction indicated by arrows ab between the forward position shown in FIG. 3 and the backward position shown in FIG. 2 retracted to the right (backward) side of the movement locus 32 of the looper 33. An intermediate part in the longitudinal direction is pivotally supported by a movable knife 2 and a device mounting base 1 via a step screw 3, and an extension drive source (not shown) such as a cylinder connected to one end in the longitudinal direction. Reciprocating rocking that can reciprocate in the left and right directions indicated by arrows cd with the axis of the stepped screw 3 as a fulcrum, and that causes the movable knife 2 to reciprocate between both positions by the reciprocating driving rocking. The movable drive lever 4 and the movable knife 2 are moved to the front of FIG. When moving backward from the position to the retracted position of FIG. 2, the fixed knife 5 that cuts the needle thread and the looper thread L captured by the thread capturing section 2 a by the cooperative action with the movable knife 2 is cut. A thread clamping plate 6 that elastically clamps the end portions of the needle thread and the looper thread L between the distal end portion of the movable knife 2 and the distal end portion of the thread clamping plate 6 is elastically pressed toward the movable knife 2 side. A thread clamping plate pressing spring 7 and a thread clamping plate pressing spring adjusting piece 8 disposed below the thread clamping plate pressing spring 7 are provided.

前記可動メス２の右端部下面にはネジ９を介して可動メス台１０が固定されている。この可動メス台１０は前記装置取付台１に段ネジ１１及びネジ１２を介して固定されたメス保持台１３の上面に摺動可能に当接支持されているとともに、該可動メス台１０の中間部は前記駆動レバー４の長手方向他端部に形成の長孔４ａ及び前記メス保持台１３に左右方向に直線的に形成の長溝１３ａに下方から挿通された段ネジ１４を介して前記駆動レバー４の長手方向他端部に連結されており、駆動レバー４の前記左右方向ｃ−ｄへの往復駆動揺動に連係して前記可動メス２を長溝１３ａに沿って前記左右方向ａ−ｂに直線的に往復駆動移動させるように構成されている。  A movable knife base 10 is fixed to the lower surface of the right end of the movable knife 2 via a screw 9. The movable knife base 10 is slidably contacted and supported on the upper surface of a knife holding base 13 fixed to the apparatus mounting base 1 via step screws 11 and screws 12. The drive lever 4 includes a long hole 4a formed at the other longitudinal end of the drive lever 4 and a step screw 14 inserted from below into a long groove 13a formed linearly in the left-right direction in the knife holding base 13. 4, the movable knife 2 is moved in the left-right direction ab along the long groove 13a in conjunction with the reciprocating drive swing of the drive lever 4 in the left-right direction cd. It is configured to move back and forth linearly.

前記固定メス５は可動メス２の上部に配置され、該固定メス５及び前記糸挟み板６に形成の左右方向の長孔５ａ及び６ａを貫通する左右２本のネジ１６を介して前記メス保持台１３に固定保持された固定メスガイド１５上に支持されている。前記左右２本のネジ１６の中間部には前記長孔５ａ，６ａ及びメス保持台１３を貫通して下方へ突出し、その突出下端部が前記糸挟み板押しバネ調節片８の略中間部に螺合連結される調節ネジ１７が設けられており、この調節ネジ１７の締め付け量を調節することにより、前記メス保持台１３を貫通して下方へ突出させたネジ１８に基端部が支持されている前記糸挟み板押しバネ調節片８の遊端部が上下に移動されて前記糸挟み板押しバネ７の糸挟み板６に対する押し付け力、ひいては、糸挟み板６と可動メス２の先端部とによる切断糸端部の弾性挟持力を調節可能に構成している。また、前記糸挟み板押しバネ７の右端部には左右方向の長孔７ａが形成され、この長孔７ａを貫通するネジ１９を介して糸挟み押しバネ取付板２０が前記メス保持台１３に固定保持されており、前記ネジ１９を緩めることにより前記糸挟み板押しバネ７の前後位置を調整可能に構成している。  The fixed knife 5 is arranged on the upper part of the movable knife 2 and holds the knife through two right and left screws 16 penetrating the left and right elongated holes 5a and 6a formed in the fixed knife 5 and the thread pinching plate 6. It is supported on a fixed knife guide 15 fixedly held on the table 13. The middle part of the two left and right screws 16 penetrates through the long holes 5a and 6a and the knife holding base 13 and projects downward, and the projecting lower end thereof is substantially the middle part of the thread pinch plate pressing spring adjusting piece 8. An adjustment screw 17 that is screwed and connected is provided. By adjusting the tightening amount of the adjustment screw 17, the base end portion is supported by a screw 18 that penetrates the female holding base 13 and protrudes downward. The free end portion of the thread pinch plate pressing spring adjusting piece 8 is moved up and down to press the thread pinch plate pressing spring 7 against the thread pinching plate 6, and thus the tip portions of the thread pinching plate 6 and the movable knife 2. The elastic pinching force at the end of the cut yarn due to is adjustable. In addition, a long hole 7a in the left-right direction is formed in the right end portion of the thread pinch plate pressing spring 7, and the thread pinching spring mounting plate 20 is connected to the knife holding base 13 via a screw 19 that passes through the long hole 7a. The front and rear positions of the thread pinch plate pressing spring 7 can be adjusted by loosening the screw 19.

そして、前記装置取付台１には、前記駆動レバー４の右左に長短二つのリンク２１，２２が配置されている。これら長短二つのリンク２１，２２の長手方向一端部は段ネジ２３，２４を介してそれらネジ軸心周りで左右に揺動可能に装置取付台１に枢支されているとともに、これら長短二つの揺動リンク２１，２２の長手方向他端部は前記段ネジ１１及びネジ１２を介して前記メス保持台１３の前後二箇所に枢支連結されて四連リンク機構を構成しており、この四連リンク機構を構成する長短二つの揺動リンク２１，２２の左右揺動により、前記可動メス２、固定メス５、固定メスガイド１５、糸挟み板６、糸挟み板押しバネ７及び糸挟み板押しバネ調節片８を保持するメス保持台１３が、図２，図３に示すように、前記針板及びルーパ３３に対して近接する前方（左方）への進出位置と、図４〜図６に示すように、その進出位置よりも斜め後方（斜め右後方）への退避位置との間に亘り揺動変位可能に構成されている。  The device mount 1 is provided with two long and short links 21 and 22 on the right and left sides of the drive lever 4. One end in the longitudinal direction of these two long and short links 21 and 22 is pivotally supported on the apparatus mounting base 1 through step screws 23 and 24 so as to be swingable to the left and right around the screw shaft centers. The other ends in the longitudinal direction of the swing links 21 and 22 are pivotally connected to the front and rear two places of the female holding base 13 via the stepped screw 11 and the screw 12 to constitute a four-link mechanism. The movable knife 2, the fixed knife 5, the fixed knife guide 15, the thread pinching plate 6, the thread pinching plate pressing spring 7 and the thread pinching plate are moved by the left and right swinging of the two long and short swing links 21 and 22 constituting the linkage mechanism. As shown in FIGS. 2 and 3, the knife holding base 13 that holds the pressing spring adjusting piece 8 is located in the forward (leftward) position close to the needle plate and the looper 33, and FIGS. As shown in FIG. It is swung displaceably configured over between a retracted position to the right rear).

前記四連リンク機構を構成する長い揺動リンク２１の中間部位の左側辺部分には駆動レバー４側へ膨出する膨出部２１ｂが形成されており、前記可動メス２と固定メス５との協働作用による糸切断後において駆動レバー４が更に右方向ｄへ復行揺動されるとき、その駆動レバー４が長い揺動リンク２１の膨出部２１ｂに当接して該揺動リンク２１を押すことにより、四連リンク機構の二つの揺動リンク２１，２２が駆動レバー４に同期して揺動動作されて前記メス保持台１３が図２，図３に示す進出位置から図６の矢印ｅ−ｆで示すルートを経て図４，図５に示す退避位置に揺動変位され、かつ、次の縫製動作後の糸切断時には駆動レバー４の左方向ｃへの揺動に伴い図６の矢印ｅ−ｆで示すルートを経て図２，図３に示す進出位置に揺動復帰されるように構成されている。  A bulging portion 21b that bulges toward the drive lever 4 is formed on the left side of the intermediate portion of the long swing link 21 constituting the four-link mechanism, and the movable knife 2 and the fixed knife 5 When the drive lever 4 is further swung backward in the right direction d after the yarn is cut by the cooperative action, the drive lever 4 comes into contact with the bulging portion 21b of the long rocking link 21 to cause the rocking link 21 to move. By pushing, the two oscillating links 21 and 22 of the four-link mechanism are oscillated in synchronization with the drive lever 4, and the knife holding base 13 is moved from the advanced position shown in FIGS. 6 through the route indicated by ef, and when the thread is cut after the next sewing operation, the drive lever 4 swings in the left direction c as shown in FIG. 2 through the route indicated by the arrow ef, and swing back to the advanced position shown in FIGS. It is configured to be.

また、前記四連リンク機構を構成する長い揺動リンク２１の中間部位と前記装置取付台１との間には、前記メス保持台１３の進出位置への揺動変位をストップし、かつ、そのストップ位置を調整可能とするストッパー機構が設けられている。詳細には、前記長い揺動リンク２１の中間部位に前記段ネジ３の軸心を中心とする長孔２１ａが形成され、この長孔２１ａ内に前記装置取付台１にネジ２５、座金２６を介して固定された段付きスペーサ２７の例えばエキセン状段部を嵌合させてなり、該エキセン状段部が前記長孔２１ａの右端部縁に当接することで前記メス保持台１３の進出位置への揺動変位がストップされ、かつ、前記段付きスペーサ２７をネジ２５の軸心周りで回転させることにより、そのエキセン状段部によって前記進出ストップ位置を調節可能な前記ストッパー機構が構成されている。Further, between the intermediate portion of the long swing link 21 constituting the four-link mechanism and the device mounting base 1, the swing displacement of the knife holding base 13 to the advance position is stopped, and A stopper mechanism that can adjust the stop position is provided. Specifically, a long hole 21a centering on the axis of the step screw 3 is formed at an intermediate portion of the long swing link 21, and a screw 25 and a washer 26 are attached to the device mounting base 1 in the long hole 21a. via, for example eccentric shaped stepped portion of the fixed stepped spacer 27 is fitted to and become, the eccentric shaped step portion to the advanced position of the long said by abutting the right end edge of the hole 21a knife holder 13 swings is stop, and, by rotating the stepped spacer 27 about the axis of the screw 25, adjustable the stopper mechanism is configured to the advanced limit position by the eccentric-shaped step portion .

さらに、前記四連リンク機構を構成する短い揺動リンク２２と装置取付台１との間には前記メス保持台１３を前記の進出位置に揺動付勢するコイルスプリング２９が張設されているとともに、短い揺動リンク２２の他端部をメス保持台１３に枢支連結するネジ１２とメス保持台１３との間には、エキセンスペーサー２８が介在されており、このエキセンスペーサー２８をネジ１２の軸心周りで回転させることにより、前記メス保持台１３の針板及びルーパ３３に対する進出位置及び退避位置を微調節可能に構成している。  Further, a coil spring 29 is provided between the short swing link 22 constituting the four-link mechanism and the apparatus mounting base 1 so as to swing the biasing base 13 to the advanced position. In addition, an eccentric spacer 28 is interposed between the screw 12 for pivotally connecting the other end of the short swing link 22 to the female holding table 13 and the female holding table 13. The eccentric spacer 28 is connected to the screw 12. The advance position and the retracted position of the knife holding base 13 with respect to the needle plate and the looper 33 can be finely adjusted.

次に、上記のように構成された糸切り装置４０の糸切断動作及びその後の退避動作並びに次の縫製動作について説明する。  Next, the yarn cutting operation, the subsequent retracting operation, and the next sewing operation of the yarn cutting device 40 configured as described above will be described.

所定の縫製動作終了直後は、図２に示すように、可動メス２、固定メス５及び糸挟み板６等を保持するメス保持台１３が針板及びルーパ３３に対して近接する前方（左方）への進出位置に移動されている。この状態で駆動レバー４が左方向ｃに往行駆動揺動されることに伴い可動メス台１０がメス保持台１３の長溝１３ａに沿って左方向ａに直線的に移動されて可動メス２が、図３に示すように、その先端の糸捕捉部２ａが針板とルーパ３３の間に進出した前進位置にまで往行移動される。その後、前記駆動レバー４の右方向ｄへの復行揺動に伴って前記可動メス２が前記の往行移動時と同じ軌跡を通って右方向ｂに直線的に復行移動して、図２に示す進出位置に復帰する直前に前記糸捕捉部２ａに捕捉した針糸及びルーパ糸Ｌが固定メス５との協働作用により切断されるとともに、その切断された各糸端部は可動メス２の先端部と糸挟み板６との間に弾性的に挟持される。この糸切断時においては可動メス２、固定メス５及び糸挟み板６がルーパ３３に近接する進出位置にあるため、被縫製物における針糸及びルーパ糸Ｌの残留長さを短く、良好な縫製仕上がりとすることができる。Immediately after the end of the predetermined sewing operation, as shown in FIG. 2, the knife holding base 13 holding the movable knife 2, the fixed knife 5, the thread clamp plate 6 and the like is in front of the needle plate and the looper 33 (leftward). ) Has been moved to the advance position. In this state, the movable knife base 10 is linearly moved in the left direction a along the long groove 13a of the knife holding base 13 as the drive lever 4 is driven to swing in the left direction c. as shown in FIG. 3, the thread catching portion 2a of the distal end is forward stroke moved to the advanced position that advances between the needle plate and the looper 33. Thereafter, as the drive lever 4 moves backward in the right direction d, the movable knife 2 linearly moves backward in the right direction b along the same locus as that in the forward movement. The needle thread and the looper thread L captured by the thread capturing section 2a immediately before returning to the advanced position shown in FIG. 2 are cut by the cooperative action with the fixed knife 5, and each of the cut thread ends is a movable knife. 2 is elastically clamped between the tip of 2 and the thread clamp plate 6. At the time of this thread cutting, since the movable knife 2, the fixed knife 5 and the thread clamp plate 6 are in the advanced position close to the looper 33, the remaining length of the needle thread and the looper thread L in the sewing product is shortened, and good sewing is performed. It can be finished.

上記した糸切断及び糸端挟持作用後において、前記駆動レバー４は引き続いて更に右方向ｄに復行揺動される。この復行揺動時に前記駆動レバー４が長い揺動リンク２１の膨出部２１ｂに当接して該揺動リンク２１を押すことにより、四連リンク機構の二つの揺動リンク２１，２２がコイルスプリング２９の付勢力に抗して右方向に揺動動作されることになり、前記メス保持台１３が、図６に示すルートｅ−ｆを経て、図４に示すように、針板及びルーパ３３に対して斜め右後方の退避位置に揺動変位、すなわち、針板及びルーパ３３に対して斜め右後方位置にオフセットされる。  After the above-described thread cutting and thread end clamping action, the drive lever 4 is continuously swung backward in the right direction d. During the backward swing, the drive lever 4 abuts against the bulging portion 21b of the long swing link 21 and pushes the swing link 21, so that the two swing links 21 and 22 of the four-link mechanism are coiled. The knife holding base 13 is swung rightward against the urging force of the spring 29, and the knife holding base 13 passes through the route ef shown in FIG. Oscillating displacement to the retracted position diagonally right rear with respect to 33, that is, offset to the diagonally right rear position with respect to the needle plate and looper 33.

このオフセット位置に退避された状態で、次の縫製動作が開始される。このとき、可動メス２、固定メス５及び糸挟み板６等の先端部は、図５に示すように、ルーパ３３の運動軌跡３２に対して斜め右後方に離間しているために、それらがルーパ３３等の動作に干渉するおそれは全くない。  The next sewing operation is started in the state retracted to the offset position. At this time, as shown in FIG. 5, the distal ends of the movable knife 2, the fixed knife 5, the thread clamp plate 6, and the like are separated diagonally right rear with respect to the motion locus 32 of the looper 33. There is no possibility of interfering with the operation of the looper 33 or the like.

加えて、前述した糸切断に伴い可動メス２の先端部と糸挟み板６との間に端部が弾性挟持されているルーパ糸Ｌは、図５に示すように、ルーパ３３の略上部に重なることなく、ルーパ３３と、可動メス２先端部と糸挟み板６により挟持された糸端との間に亘って斜めに張られた状態となるために、ルーパ糸Ｌにより大きな三角エリアＥが確実に形成されることになる。したがって、使用するルーパ糸Ｌの種類等に関係なく、次の縫製動作開始時には針落ち部３１に向け下降する針をルーパ糸Ｌの三角エリアＥに確実に移入させて目飛びの発生を防止し所定通りの良好な縫製を行うことができる。  In addition, the looper yarn L whose end is elastically sandwiched between the tip of the movable knife 2 and the yarn clamping plate 6 in accordance with the above-described yarn cutting is located substantially above the looper 33 as shown in FIG. A large triangular area E is formed by the looper thread L because the looper thread L and the loop end of the movable knife 2 and the thread end clamped by the thread clamping plate 6 are slanted without overlapping. It is surely formed. Therefore, regardless of the type of looper thread L to be used, at the start of the next sewing operation, the needle descending toward the needle drop portion 31 is reliably transferred to the triangular area E of the looper thread L to prevent the occurrence of skipping. Good sewing can be performed as prescribed.

また、前記可動メス２、固定メス５及び糸挟み板６の先端部が針板及びルーパ３３に対してオフセットされた状態では、ルーパ３３の糸穴周辺には左右、上下に十分に広いスペースが確保されることになるために、その糸穴へのルーパ糸Ｌの通し作業を針板やメス２，５等に邪魔されることなく非常に容易に行うことができる。  In addition, in a state where the distal ends of the movable knife 2, the fixed knife 5 and the thread clamp plate 6 are offset with respect to the needle plate and the looper 33, there is a sufficiently wide space around the thread hole of the looper 33 in the left and right and up and down directions. Therefore, the operation of passing the looper thread L through the thread hole can be performed very easily without being interrupted by the needle plate, the scalpels 2, 5 and the like.

さらに、メス保持台１３を斜め右後方の退避位置へオフセット移動させるにあたって、長短二つの揺動リンク２１，２２からなる四連リンク機構を用いているので、長孔とこれに係合するネジとの摺動による案内作用でオフセット移動させるように構成する場合に比べて、メス保持台１３をしっかりと支持させてガタ付きの発生を非常に少なくするともに、ネジなどの摺動案内部品に集中的に過負荷を掛けてそれが破損したり、変形したりするおそれも非常に少なくすることができるために、糸切り装置４０全体の耐久性の向上並びに切断後の糸端の弾性挟持機能の安定化を図ることができる。  Further, when the knife holding base 13 is offset and moved to the retracted position diagonally right rear, a four-link mechanism comprising two long and short rocking links 21 and 22 is used. Compared to the case where the offset movement is performed by the guide action by sliding, the support 13 is firmly supported to reduce the occurrence of backlash and is concentrated on the sliding guide parts such as screws. The possibility of overloading and damage or deformation of the yarn can be greatly reduced, so that the durability of the entire yarn trimming device 40 can be improved and the elastic pinching function of the yarn end after cutting can be stabilized. Can be achieved.

なお、本発明の糸切り装置は、偏平縫いミシンまたは二重環縫いミシンにおける糸切り装置として特に有効に適用可能であるが、それ以外の各種形態のミシンにおける糸切り装置に適用してもよいこともちろんである。  The thread trimming device of the present invention can be particularly effectively applied as a thread trimming device in a flat stitch sewing machine or a double chain stitch sewing machine, but may be applied to a thread trimming device in various other types of sewing machines. Of course.

また、上記実施の形態では、四連リンク機構を構成する長い揺動リンク２１の中間部位の左側辺部分に駆動レバー４側に膨出する膨出部２１ｂが形成され、この膨出部２１ｂに駆動レバー４が当接して長い揺動リンク２１を押すようにしたもので説明したが、膨出部２１ｂは必ずしも必要でなく、駆動レバー４を揺動リンク２１の左側辺部に直接当接させるようにしても、また、駆動レバー４側に揺動リンク２１に当接する突部やピンなどを設けてもよい。  Moreover, in the said embodiment, the bulging part 21b which bulges to the drive lever 4 side is formed in the left side part of the intermediate part of the long rocking | fluctuation link 21 which comprises a quadruple link mechanism, This bulging part 21b Although the description has been made with the driving lever 4 contacting and pushing the long swing link 21, the bulging portion 21 b is not necessarily required, and the drive lever 4 is directly contacted with the left side portion of the swing link 21. Alternatively, a protrusion or a pin that contacts the swing link 21 may be provided on the drive lever 4 side.

本発明に係るミシンの糸切り装置を構成する構成部品の分解斜視図てある。It is a disassembled perspective view of the component which comprises the thread trimming device of the sewing machine which concerns on this invention. 同上糸切り装置の構成部品が組付けられた状態の要部の平面図である。It is a top view of the principal part in the state in which the component parts of the same thread trimming device were assembled. 同上糸切り装置における可動メスが前進位置に進出した状態を示す要部の平面図である。It is a top view of the principal part which shows the state which the movable knife in the same thread trimming apparatus advanced to the advance position. 同上糸切り装置の可動メス等が退避位置に後退した状態を示す要部の平面図である。It is a top view of the principal part which shows the state which the movable knife etc. of the thread trimming apparatus same as the above retracted to the retracted position. 同上糸切り装置の可動メス等が退避位置に後退したときのルーパ糸の張設状態等を示す要部の平面図である。It is a top view of the principal part which shows the tension | tensile_strength state etc. of a looper thread | yarn when the movable knife etc. of the thread trimming apparatus same as the above retracted to the retracted position. 同上糸切り装置のメス保持台及び可動メスの進退ルートを説明する要部の平面図である。It is a top view of the principal part explaining the advance / retreat route of the knife holding stand and movable knife of the same thread trimmer. 従来の糸切り装置における可動メス等が後退位置に後退したときの可動メス等とルーパとの位置関係を示す要部の斜視図である。It is a perspective view of the principal part which shows the positional relationship of a movable knife etc. and a looper when the movable knife etc. in the conventional thread trimming apparatus retracted to the retreat position. 従来の糸切り装置における可動メス等が後退位置に後退した状態で、かつ、ルーパが最右端に移動したときの可動メス等とルーパとの位置関係を示す要部の斜視図である。It is a perspective view of the principal part which shows the positional relationship of a movable knife etc. and a looper when the movable knife etc. in the conventional thread trimming apparatus have retracted to the retreat position and the looper has moved to the rightmost end.

符号の説明Explanation of symbols

１ 装置取付台
２ 可動メス
２ａ 糸捕捉部
４ 揺動式駆動レバー
５ 固定メス
６ 糸挟み板
１３ メス保持台
２１ 長い揺動リンク
２２ 短い揺動リンク
２８ エキセンスペーサー
３３ ルーパ
４０ 糸切り装置
Ｌ ルーパ糸DESCRIPTION OF SYMBOLS 1 Device mounting base 2 Movable knife 2a Thread catcher 4 Oscillating drive lever 5 Fixed knife 6 Thread clamp plate 13 Female holding base 21 Long oscillating link 22 Short oscillating link 28 Eccentric spacer 33 Looper 40 Thread trimmer L Looper thread

Claims (3)

先端部に針糸及びルーパ糸を捕捉する糸捕捉部を有し、その糸捕捉部が針板とルーパの間に進出した前進位置と前記ルーパの運動軌跡の後方側に退入した後退位置との間に亘って往復移動可能な可動メスと、この可動メスを前記両位置間に亘って往復駆動移動させる往復揺動式駆動レバーと、所定の縫製動作終了後に前記可動メスが前進位置から後退位置に往行駆動移動するとき、前記糸捕捉部に捕捉された針糸及びルーパ糸を前記可動メスとの協働作用により切断する固定メスと、切断された針糸及びルーパ糸の端部を前記可動メスの先端部との間で弾性挟持する糸挟み板とを具備してなるミシンの糸切り装置において、
装置取付台には、前記可動メス、固定メス及び糸挟み板を保持するメス保持台を前記針板及びルーパに対して近接した前方への進出位置とそれよりも斜め後方への退避位置との間で揺動変位させることが可能な長短二つの揺動リンクからなる四連リンク機構が設けられており、前記可動メスと固定メスとの協働作用による糸切断後における前記駆動レバーの更なる復行揺動時に該駆動レバーが前記四連リンク機構の長い揺動リンクに当接して該四連リンク機構が同期作動され前記メス保持台を前記進出位置から退避位置に揺動変位させるように構成されていることを特徴とするミシンの糸切り装置。It has a thread catching part that catches the needle thread and looper thread at the tip part, and the thread catching part has advanced between the needle plate and the looper, and the retracted position retracted to the rear side of the movement locus of the looper. A movable knife capable of reciprocating between the two positions, a reciprocating oscillating drive lever for reciprocatingly driving the movable knife between the two positions, and the movable knife retracts from the forward position after a predetermined sewing operation. A fixed knife that cuts the needle thread and the looper thread captured by the thread trapping portion by a cooperative action with the movable knife, and an end of the cut needle thread and the looper thread when moving forward to a position. In a thread trimming device for a sewing machine comprising a thread pinching plate that elastically clamps between the tip of the movable knife,
The device mounting base has a knife holding base for holding the movable knife, the fixed knife and the thread pinching plate between a forwardly advanced position close to the needle plate and the looper and a retracted position obliquely backward than that. A quadruple link mechanism comprising two long and short rocking links that can be rocked and displaced between them, and the drive lever after the yarn is cut by the cooperative action of the movable knife and the fixed knife. At the time of reverse swing, the drive lever comes into contact with the long swing link of the four-link mechanism so that the four-link mechanism is operated synchronously to swing and displace the knife holding base from the advanced position to the retracted position. A thread trimming device for a sewing machine, characterized by being configured. 前記四連リンク機構の長い揺動リンクの中間部位と前記装置取付台との間には、前記メス保持台の前記進出位置への揺動変位をストップし、かつ、そのストップ位置を調節可能としたストッパー機構が設けられている請求項１に記載のミシンの糸切り装置。Between the intermediate portion and the device mount a long swing link of the quadruplicate linkage, to stop swings to the advanced position of the female holder, and can be adjusted its stop position The sewing machine thread trimming device according to claim 1, wherein the stopper mechanism is provided. 前記四連リンク機構の短い揺動リンクのメス保持台への枢支部には、前記メス保持台の針板及びルーパに対する前後位置を調節可能なエキセンスペーサーが介在されている請求項１または２に記載のミシンの糸切り装置。  The eccentric spacer which can adjust the front-back position with respect to the needle plate and looper of the said female holding base is interposed in the pivotal support part to the female holding base of the short swing link of the four-link mechanism. The thread trimming device of the description sewing machine.
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KR1020080022514A KR101446050B1 (en) 2007-03-15 2008-03-11 Thread cutter of sewing machine
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