JP4465877B2 - Sewing machine threading device - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、針棒に近接状の糸通し軸を下降・回動することで糸通し軸の下端部のフックで糸通しを行うミシンの糸通し装置に関する。
【０００２】
【従来の技術】
従来、ミシンにより加工布に縫目を形成する縫製作業に際して、縫針の針穴に簡単に糸通しが可能な糸通し装置を装備したミシンが実用に供されている（特開平１１−３３３１８２号公報参照）。この特開平１１−３３３１８２号公報には、操作者が操作レバーを下方に移動させると、糸通し軸と操作軸とが下降し、糸通し軸の上端部の摺動ピンが針棒側の係止部に当接した段階でこれら糸通し軸と操作軸の高さ位置が規制され、その後さらに操作レバーを下方に移動すると、摺動ピンつまり糸通し軸が、摺動ピンを含むカム機構により所定角度だけ回動して、糸通し軸の下端部に付設のフックを針穴に挿通させた後、糸通しが実行される糸通し装置が提案されている。
【０００３】
この種の糸通し装置では、糸通しする前の準備段階において、糸駒から供給される上糸を順次、針棒糸掛け、糸案内部材、糸案内皿に掛けておくが、上糸を糸案内部材に掛けたときに同時に前記糸案内部材の直ぐ内側の別の糸案内部材の糸案内部に上糸が掛かり、糸通しの際にこれら１対の糸案内部材を互いに離隔する方向に回動させて上糸の一部を略水平方向に且つ針穴付近の所定位置に保持したうえで、保持した上糸の一部をフックが捕捉する。
【０００４】
【発明が解決しようとする課題】
前記公報に記載のものでは、上糸を掛ける糸案内部材の糸ガイド部の導入部分の自由度が大き過ぎ、しかもこの糸案内部材が糸通し軸の軸心回りにガタつくことで、この糸ガイド部に上糸を掛けたときに直ぐ内側の糸案内部材の糸案内部に上糸がうまく掛からない場合がある。その場合には、糸通しの際に上糸の一部を針穴付近の所定位置に保持できず上糸をフックが捕捉できないから糸通しが失敗する。
本発明の目的は、糸通しの際に上糸の一部を針穴付近の所定位置に確実に保持することができるミシンの糸通し装置を提供することである。
【０００５】
【課題を解決するための手段】
請求項１のミシンの糸通し装置は、ミシンの針棒に近接させて針棒台に回動および上下動可能に設けられた糸通し軸と、この糸通し軸の下端部に固定され縫針の針穴に挿通可能なフックと、外部又は内部からの操作力により糸通し軸を下降限界位置に切換えその下降限界位置で糸通し軸を回動させて前記フックが針穴に挿通するように所定角度だけ回動させるカム機構とを備えたミシンの糸通し装置において、前記糸通し軸の下端部に固定され且つフックに対して糸通し軸の軸心回りに所定角度離隔して配設された第１糸案内部材と、前記糸通し軸の下端部に回動自在に枢着されリンク機構を介して第１糸案内部材に連結された第２糸案内部材であって、糸通し軸の回動時に第１糸案内部材と協働して上糸の一部を針穴付近の所定位置に保持する第２糸案内部材とを備え、前記糸通し軸の回動前の状態において、第２糸案内部材の回動を規制する回動規制部材を設けたことを特徴とするものである。
【０００６】
糸通しする前の準備段階（糸通し軸の回動前の状態）において上糸を針棒糸掛け、第２，第１糸案内部材、糸案内皿に掛け、その後、外部又は内部からの操作力でもって糸通し軸を下降限界位置に切換え、その下降限界位置でカム機構により糸通し軸を回動させてフックが針穴に挿通するように回動させる。この糸通し軸の回動時には、第１糸案内部材と第２糸案内部材とで協働して上糸の一部を針穴付近の所定位置に保持したうえで、保持した上糸の一部を前記フックが捕捉し糸通しが実行される。
【０００７】
特に、糸通し軸の回動前の状態において、回動規制部材により第２糸案内部材の回動が規制され、第２糸案内部材が糸通し軸の軸心回りにガタつくのを防止し、上糸を第２糸案内部材に掛けるときに、この上糸を第１糸案内部材に確実に掛けることができる。
【０００８】
請求項２のミシンの糸通し装置は、請求項１の発明において、前記糸通し軸の回動前の状態で、前記第２糸案内部材は、第１糸案内部材の上側と手前側に夫々位置する上壁部と前壁部とを有し、前記前壁部に、下方から上糸を導入可能な切欠きスリット状の糸ガイド部を形成したことを特徴とするものである。それ故、上糸を切欠きスリット状の糸ガイド部に下方からスムーズに導入することができる。
【０００９】
請求項３のミシンの糸通し装置は、請求項２の発明において、前記第２糸案内部材の上壁部に、糸通しの際に上糸を案内可能な切欠きの糸ガイド部を形成したことを特徴とするものである。糸通しの際、この上壁部の糸ガイド部と前壁部の糸ガイド部と第１糸案内部材とにわたって上糸の一部が保持されて糸通しが実行される。
【００１０】
【００１１】
請求項４のミシンの糸通し装置は、請求項２の発明において、前記第２糸案内部材は、針棒の針棒糸掛けから至る上糸が糸案内皿に移動される際に、前記糸ガイド部へ導く糸滑り部を備えることを特徴とするものである。針棒糸掛けから至る上糸が糸案内皿に移動される際に、上糸がこの糸滑り部に沿って糸ガイド部へ導かれるから、より一層糸通しが確実となる。
【００１２】
【発明の実施の形態】
以下、本発明の実施の形態について図面に基づいて説明する。本実施形態は、針棒上下動機構や針棒揺動機構等を備えた電子制御式ミシンに設けられた糸通し装置に本発明を適用した場合のものである。尚、以下の説明は、ミシンを操作する者から視た前後左右を前後左右として説明する。
【００１３】
図１〜図４に示すように、この電子制御式ミシン１は、ベッド部２と、ベッド部２の右端部に立設された脚柱部３と、脚柱部３の上端から左方に延びるアーム部４を有する。アーム部４の頭部には、針棒５を上下動可能に支持する針棒台６が立向きに配設され、その針棒台６の上端部がミシン機枠７に揺動可能に支持されている。
【００１４】
針棒上下動機構８について簡単に説明すると、図４に示すように、主軸９の左端側部分には、図示外の天秤機構の天秤クランク１０が設けられ、その天秤クランク１０にクランクピン１１を介して針棒クランクロッド１２が回動自在に連結されている。針棒５の略中段部には針棒抱き１３が固定され、針棒クランクロッド１２が針棒抱き１３に連結され、縫製の際、ミシンモータにより主軸９が回転駆動され、針棒クランクロッド１２により針棒５が上下に往復駆動される。尚、ステッピングモータ等により針棒台６を介して縫針１４を揺動駆動する針棒揺動駆動機構は一般的なものであるのでその説明は省略する。
【００１５】
図示しないが、脚柱部３にはほぼ立て向きの縦軸が配設され、その縦軸はギヤ機構を介して主軸９に連動連結され、この縦軸の駆動力がベッド部２内の糸補足用釜に伝達される。一般的な電子制御ミシンと同様に、縫針１４と糸補足用釜とステッピングモータで駆動される布送り機構との協働により加工布に縫製が施される。
【００１６】
次に、縫針１４の針穴１４ａに上糸Ｓを糸通しする糸通し装置１５について説明する。
図３〜図１１に示すように、糸通し装置１５は、前記針棒台６と、針棒台６に上下動可能に設けられた操作体としての糸通しスライダ１６と、糸通し軸１７と、スライダーガイド軸１８と、フック機構１９と、位置決め機構２０と、カム機構２１と、フック回動規制機構２２を有する。
【００１７】
図４〜図７に示すように、針棒台６について説明すると、針棒台６は前壁部２３と左壁部２４とを有し、前壁部２３の下端と上端には後方へ延びる下支持部２５と上支持部２６が夫々一体形成されている。左壁部２４の上端部には、上支持部２６よりも上方に延びる枢支腕部２７が形成され、枢支腕部２７の上端部には、左右方向向きの軸部材２８が固着され、この軸部材２８は、前面開放状の平面視コ字形状の枢支金具２９に前後揺動可能に連結されている。
【００１８】
枢支金具２９は前後方向向きの水平な支持軸３０を介してミシン機枠７に左右揺動可能に支持されている。従って、針棒台６は、ミシン機枠７に前後方向と左右方向に揺動可能に支持されている。但し、針棒台６と機枠７とにわたって引張りコイルバネ３１が介装され、針棒台６の下端側部分が後方向きに付勢されている。尚、調整ネジ３２とこの引張りコイルバネ３１の付勢力により針棒台６つまり縫針１４の前後方向の位置を調整できる。
【００１９】
針棒５は上支持部２６と下支持部２５に上下動可能に挿通支持され、針棒５の下端には、縫針１４が着脱可能に取付けられている。針棒５において針棒抱き１３の直ぐ上方には、係止部としての糸通し位置決め部材３３が固定されている。糸通し軸１７とスライダーガイド軸１８について説明すると、図４〜図１１に示すように、針棒台６の上支持部２６と下支持部２５には、針棒５の左側に位置する糸通し軸１７とスライダーガイド軸１８とが上下動可能に支持されている。糸通し軸１７の上端部は、その最上位置において枢支金具２９と軸部材２８の間の隙間に挿通し、糸通し軸１７の略中段部には、水平方向に突出する被係止部としての摺動ピン３４が固着されている。
【００２０】
図４、図６〜図１３に示すように、糸通し軸１７の下端部には、合成樹脂のフック保持部材３５が固着され、さらにこの糸通し軸１７の下端部に、側面視略コ字形状の第２糸案内部材３６（図３参照）がその上壁部としての上支持部３７、下支持部３８をフック保持部材３５の上側、下側に夫々対応させて回動可能に支持されている。この第２糸案内部材３６のうち、上支持部３７には、糸通しの際に上糸Ｓを案内可能な切欠きの糸ガイド部３７ａ（図１１参照）が形成されている。上支持部３７と下支持部３８とを連結する鉛直状の連結壁３９（前壁部に相当する）には、下方から上糸Ｓを導入可能な切欠きスリット状の糸ガイド部３９ａが形成されている。また、上糸Ｓを糸ガイド部３９ａに導入する糸滑り部３９ｃが形成されている。本実施形態においては、入口が狭く、内部が広い切欠きスリット状糸ガイド部としたが、入口から内部にかけ徐々に狭くなるテーパ状の切欠きスリット状糸ガイド部としてもよい。
【００２１】
図７〜図１４、図２２〜図２４、図２６〜図２８に示すように、フック保持部材３５にはフック機構１９が固定され、このフック機構１９は、フック４０と、フック４０の両側に位置する２枚のガイド部材４１，４２と、これらフック４０とガイド部材４１，４２を水平に貫通する糸保持ワイヤ４３等から構成されている。フック４０の先端部にはフック部４０ａが形成され、糸通しに際し、針穴１４ａにこのフック部４０ａが挿通し、縫針１４がガイド部材４１，４２により案内されつつ針穴１４ａの直前に位置する上糸Ｓを引っ掛けるようになっている。
【００２２】
フック保持部材３５には第１糸案内部材４４が一体的に固着され、この第１糸案内部材４４の略先端近傍部が下方に屈曲形成され、その屈曲部が糸案内部４４ａとして機能している。この第１糸案内部材４４は、フック４０に対して糸通し軸１７の軸心回りに所定角度離隔して配設されている。即ち、第１糸案内部材４４とフック機構１９とが一定の位置関係を保持して糸通し軸１７に一体的に設けられている。糸通し軸１７の回動前の状態において、第２糸案内部材３６の上支持部３７と連結壁３９は、第１糸案内部材４４の上側と手前側に夫々位置し、且つ、第２糸案内部材３６の連結壁３９には、第１糸案内部材４４の少なくとも糸案内部４４ａの手前側を覆うガード壁部３９ｂが設けられている。
【００２３】
次に、糸通し軸１７をその下降限界位置で回動させるカム機構２１について説明する。
図３〜図７、図１７〜図２１に示すように、糸通し軸１７とスライダーガイド軸１８の略中段部には、合成樹脂製の糸通しスライダ１６（操作体に相当する）が上下動可能に外嵌されている。この糸通しスライダ１６は、スライダーガイド軸１８に上下動可能に外嵌されたガイド部４５と、糸通し軸１７に上下動可能に外嵌され且つガイド部４５に一体形成されたガイド筒部４６と、ガイド部４５の左端から上方に延びるスライダレバー部４７などから構成されている。ガイド筒部４６は、その左半部の外周壁部４８がガイド部４５に鉛直状に連結され、右半部の外周部分のうちの大部分が切欠き状に形成されている。
【００２４】
図３〜図７、図１８、図２０に示すように、外周壁部４８には、螺旋状の糸通しスライダカム部４８ａ（以下、カム部４８ａという）が形成され、このカム部４８ａに糸通し軸１７の摺動ピン３４の奥側端部が係合している。即ち、糸通しスライダ１６を糸通し軸１７に対して上下動させることで、摺動ピン３４がカム部４８ａに沿って移動し、糸通し軸１７が回動する。糸通し軸１７において摺動ピン３４よりも一定長さ下側（カム機構２１よりも下方）には、被係止部としてのピン４９が水平貫通状に固定され、ガイド筒部４６とピン４９との間に圧縮コイルバネ５０が外装されている。スライダーガイド軸１８においてガイド部４５と針棒台６の下支持部２５との間には、糸通しスライダ１６を上方へ付勢する為の圧縮コイルバネ５１が外装されている。
【００２５】
次に、位置決め機構２０について説明する。
図５〜図７、図１５〜図２１に示すように、位置決め機構２０は、糸通し軸１７の下降限界位置（図１７参照）をフック４０と針穴１４ａとの高さが一致する位置に規制する機構であり、針棒５に設けられた前記糸通し位置決め部材３３と、ピン４９と、位置決め用オフセット部材５２などから構成されている。
ここで、位置決め用オフセット部材５２について説明すると、図３〜図７、図１５、図１６に示すように、糸通し軸１７において、針棒台６の上支持部２６と下支持部２５との間には、上支持部２６、下支持部２５間の高さの約３／４長さの位置決め用オフセット部材５２が上下動可能に且つ糸通し軸１７と一体回転するように装着されている。このオフセット部材５２は、上支持部５３と、下支持部５４と、これら上支持部５３と下支持部５４とを部分的に連結する鉛直状の連結壁５５等から構成されている。
【００２６】
図１５、図１６に示すように、上支持部５３には、その右後端側がやや突出する突出部５３ａが形成され、この突出部５３ａが糸通し位置決め部材３３に上方から当接可能に構成されている。この上支持部５３に糸通しスライダ１６のガイド筒部４６が当接・離隔可能に構成され、通常の糸通し軸１７の待機状態（最上位置）においては、圧縮コイルバネ５１の付勢力により上支持部５３に対してガイド筒部４６が当接し、上支持部５３が針棒台６の上支持部２６に当接するようになっている。
【００２７】
連結壁５５の下半部には、ピン４９をガイド可能に保持する縦スリット５５ａが形成され、縦スリット５５ａの底部すなわちオフセット部材５２の下端部に、ピン４９を受止める受止め部５６がある。ピン４９は、前記待機状態では圧縮コイルバネ５１の付勢力により縦スリット５５ａ内の上方にあり、糸通し軸１７の最下位置のときには受止め部５６に受け止められる。
【００２８】
糸通しのときには、図１２〜図１４、図２２〜図２４、図２６〜図２８に示すように、フック機構１９が縫針１４に接近する方向に回動され、フック４０が針穴１４ａに挿通する。同時に、第１糸案内部材４４がフック機構１９と同期して上からみて時計回り方向（縫針１４から遠ざかる方向）に回動される。糸通しに際して、糸通し軸１７の下端部に回動可能に支持された第２糸案内部材３６を第１糸案内部材４４から離隔する方向に回動させるリンク機構６４も設けられている。
【００２９】
即ち、糸通し軸１７の糸通しの為に回動する前の待機状態のときには、第２糸案内部材３６が前方向きの姿勢であり、第１糸案内部材４４の糸案内部４４ａは、連結壁３９の糸ガイド部３９ａの直ぐ内側に位置している。また、図８〜図１３に示すように、フック部４０ａが糸保持ワイヤ４３と共に上糸Ｓを保持した状態で上昇した後、フック部４０ａの開放を許すフック開放板６８が針棒台６の下支持部２５に下方向きにビス（α）止めされている。フック開放板６８の上半部には、第２糸案内部材３６の回動を規制する回動規制部材６９が一体的に形成されている。この回動規制部材６９は、斜め下方向きにやや突出する傾斜板状に形成され、糸通し軸１７の回動前の状態において、リンク機構６４のリンク板７０に当接してリンク機構６４の作動を停止することにより第２糸案内部材３６の回動を規制するように構成されている。
【００３０】
糸通し軸１７が下降限界位置まで下降した後に回動するとき、フック機構１９と第１糸案内部材４４とが平面視にて時計回り方向に一体的に回動すると共に、リンク機構６４を介して第２糸案内部材３６が反時計回り方向に回動する。つまり、第２糸案内部材３６は、第１糸案内部材４４から離隔移動し且つフック機構１９に接近移動するようになっている。尚、リンク機構１９付近には、上糸Ｓを微圧挟持する支持板６５、糸案内皿６６も設けられている。
【００３１】
次に、フック回動規制機構２２について説明する。
図４、図６、図７、図１５、図１６に示すように、回動規制機構２２は、針棒５が所定位置より上方にあるときオフセット部材５２と糸通し軸１７の回動を許し且つ針棒５が所定位置より下方にあるときオフセット部材５２と糸通し軸１７の回動を禁止する機構である。ところで、オフセット部材５２の縦スリット５５ａにピン４９がガイド可能に保持されているため、カム機構２１の作動を介してオフセット部材５２が糸通し軸１７と一体回転する。このオフセット部材５２の連結壁５５には、柱状に突出するストッパ部５７が一体形成されている。但し、このストッパ部５７の上端には、糸通し位置決め部材３３の係止部分３３ａが通過可能に切欠き形成された横スリット５８が設けられている。
【００３２】
針棒５が所定位置より上方にあるときに、糸通しスライダ１６を糸通し軸１７、スライダーガイド軸１８、オフセット部材５２と一体的に下降させてオフセット部材５２の上支持部５３を糸通し位置決め部材３３に当接させ、その後、糸通し軸１７の下降限界位置においてカム機構２１の作動を介してオフセット部材５２が糸通し軸１７と一体回転する。このとき、上支持部５３が糸通し位置決め部材３３に当接した状態で、その係止部分３３ａが横スリット５８を通過することによりオフセット部材５２と糸通し軸１７の回動が許容される。針棒５が所定位置より下方にあるときには、糸通し位置決め部材３３の係止部分３３ａがストッパ部５７に阻まれてオフセット部材５２と糸通し軸１７の回動を禁止する。
【００３３】
次に、操作レバー５９等について説明する。
図１〜図４に示すように、機枠７に鉛直方向向きにレバー軸６０が支持され、このレバー軸６０にフレーム６１が上下動可能に外装されている。糸通しスライダ１６のスライダレバー部４７の先端部がフレーム６１の右端部に嵌合され、フレーム６１の左端部に操作レバー５９がスリット６２を介してアーム部４の左側に露出するように固定されている。但し、機枠７とフレーム６１とにわたって引張りコイルバネ６３が介装され、フレーム６１つまり操作レバー５９を上方位置に付勢するようになっている。
【００３４】
次に、以上説明した糸通し装置１５の作用について説明する。
針棒５が前記所定位置より上方にある場合、フック回動規制機構２２が作用しないので縫針１４の針穴１４ａに上糸Ｓを糸通しすることができる。この場合、図１０、図２５に示すように、先ず図示外の糸駒から供給される上糸Ｓを針棒糸掛け６７、糸ガイド３９ａ、糸案内皿６６に掛ける。このとき、針棒糸掛け６７から糸案内皿６６に上糸Ｓを掛けることで、上糸Ｓが連結壁３９に形成された糸ガイド部３９ａに下方からスムースに且つ自動的に導入されると共に、第１糸案内部材４４の糸案内部４４ａにも自動的に掛かる。
【００３５】
さらにこのとき、回動規制部材６９により第２糸案内部材３６の回動が規制され、第２糸案内部材３６が糸通し軸１７の軸心回りにガタつくのを防止し、上糸Ｓを第２糸案内部材３６に掛けるときに、この上糸Ｓを第１糸案内部材４４に確実に掛けることができる。次に、操作レバー５９を下げると、糸通しスライダ１６が引張りコイルバネ６３の付勢力に抗して下降し、糸通し軸１７、スライダーガイド軸１８、オフセット部材５２も一体的に下降する。
【００３６】
次に、オフセット部材５２が糸通し位置決め部材３３に当接して停止し、この状態でさらに操作レバー５９を下げると、ピン４９が縦スリット５５ａに沿って下降し受止め部５６に受け止められて停止する。つまり糸通し軸１７が下降限界位置まで下降する。このとき、位置決め機構２０により糸通し軸１７の下降限界位置を、フック４０と縫針１４の針穴１４ａとの高さが一致する位置に規制している。
【００３７】
更に、操作レバー５９を下げると、カム機構２１により糸通し軸１７が回動してフック４０が縫針１４の針穴１４ａに挿入し、上糸Ｓを補捉する。このとき、糸保持ワイヤ４３が縫針に当接する為、フック部４０ａは開放された状態になっている。またこのとき、操作レバー５９は最下位置で停止した状態となる。次に、操作レバー５９を離すと、フック部４０ａで上糸Ｓを保持しつつこのフック４０が針穴１４ａから抜け、同時にフック部４０ａを糸保持ワイヤ４３で閉止して上糸Ｓがフック部４０ａから外れないようにする。次に、圧縮コイルバネ５０，５１の付勢力でもって糸通しスライダ１６、オフセット部材５２が上昇し最初の待機状態に戻る。
【００３８】
このとき、フック部４０ａが上糸Ｓを保持した状態で上昇する（図２４参照）。その後、糸保持ワイヤ４３がフック開放板カム部７１に当接してフック４０が開放され、形成された上糸Ｓのループを引っ張ることで針穴１４ａへの糸通しが完了する。針棒５が前記所定位置により下方にある場合には、回動規制機構２２が作用する。つまり、糸通し位置決め部材３３の係止部分３３ａがストッパ部５７に阻まれてオフセット部材５２と糸通し軸１７の回動を禁止するので、糸通しが禁止される。
【００３９】
以上、説明した糸通し装置１５によれば、糸通し軸１７の回動前の状態で、第２糸案内部材３６は、第１糸案内部材４４の上側と手前側に夫々位置する上支持部３７と連結壁３９とを有し、第２糸案内部材３６の連結壁３９に第１糸案内部材４４の少なくとも糸案内部４４ａの手前側を覆うガード壁部３９ｂを設けたので、上糸Ｓを第２糸案内部材３６に掛けるときに、上糸Ｓを、ガード壁部３９ｂに沿って導入し第２糸案内部材３６から離脱することなく第１糸案内部材４４の糸案内部４４ａに確実に掛けることができる。それ故、糸通しの際に上糸Ｓの一部を針穴１４ａ付近の所定位置に確実に保持することができ、糸通し装置１５の信頼性が高くなる。
【００４０】
第２糸案内部材３６の連結壁３９に、下方から上糸Ｓを導入可能な切欠きスリット状の糸ガイド部３９ａを形成したので、上糸Ｓを切欠きスリット状の糸ガイド部３９ａに下方からスムースに導入することができる。第２糸案内部材３６の上支持部３７に、糸通しの際に上糸Ｓを案内可能な切欠きの糸ガイド部３７ａを形成したので、糸通しの際、この上支持部３７の糸ガイド部３７ａと連結壁３９の糸ガイド部３９ａと第１糸案内部材４４とにわたって上糸Ｓの一部が保持されて糸通しが実行される。
【００４１】
糸通し軸１７の回動前の状態において、回動規制部材６９により第２糸案内部材３６の回動が規制され、第２糸案内部材３６が糸通し軸１７の軸心回りにガタつくのを防止し、上糸Ｓを第２糸案内部材３６に掛けるときに、この上糸Ｓを第１糸案内部材４４に確実に掛けることができる。
【００４２】
次に、本実施形態を部分的に変更した変更形態について説明する。
１）本実施形態においては、アーム部４の外部からの手動操作力により糸通し軸１７を下降限界位置に切換えているが、アーム部４の内部に例えばモータ等のアクチュエータを設け、このモータの駆動力（すなわち操作力）でもって糸通し軸１７を下降限界位置に切換える構成にしてもよい。
【００４３】
２）ガード壁部を、第２糸案内部材３６の連結壁３９に別体に形成して接合する構造にしてもよい。
３）回動規制部材６９を、針棒台６の下支持部２５にフック開放板６８と別体に設けてもよい。その他、本願発明の趣旨を逸脱しない範囲において前記実施形態に種々の変更を付加した形態で実施可能である。
【００４４】
【発明の効果】
請求項１の発明によれば、糸通し軸の回動前の状態において、第２糸案内部材の回動を規制する回動規制部材を設けたので、第２糸案内部材が糸通し軸の軸心回りにガタつくのを防止でき、上糸を第２糸案内部材に掛けるときに、上糸を、第１糸案内部材に確実に掛けることができる。それ故、糸通しの際に上糸の一部を針穴付近の所定位置に確実に保持することができ、糸通し装置の信頼性が高くなる。
【００４５】
請求項２の発明によれば、第２糸案内部材の前壁部に、下方から上糸を導入可能な切欠きスリット状の糸ガイド部を形成したので、上糸を切欠きスリット状の糸ガイド部に下方からスムーズに導入することができる。その他請求項１と同様の効果を奏する。
【００４６】
請求項３の発明によれば、第２糸案内部材の上壁部に、糸通しの際に上糸を案内可能な切欠きの糸ガイド部を形成したので、糸通しの際、この上壁部の糸ガイド部と前壁部の糸ガイド部と第１糸案内部材とにわたって上糸の一部が保持されて糸通しが実行される。その他請求項２と同様の効果を奏する。
【００４７】
【００４８】
請求項４の発明によれば、針棒糸掛けから至る上糸が糸案内皿に移動される際に、上糸がこの糸滑り部に沿って糸ガイド部へ導かれるから、より一層糸通しが確実となる。その他請求項２と同様の効果を奏する。
【図面の簡単な説明】
【図１】本発明の実施形態に係る電子制御式ミシンの正面図である。
【図２】ミシンの側面図である。
【図３】糸通し装置の内部構造を示すミシンの一部破断した側面図である。
【図４】アーム部の要部断面図である。
【図５】糸通し装置の斜視図である。
【図６】糸通し装置の正面図である。
【図７】糸通し軸の下降限界位置における図６相当図である。
【図８】フック機構、縫針付近の拡大側面図である。
【図９】フック機構、針棒付近の拡大背面図である。
【図１０】糸通し前の準備段階を示すフック機構、針棒付近の正面図である。
【図１１】糸通し段階の図１０相当図である。
【図１２】リンク機構、フック機構の底面図である。
【図１３】糸通し段階のリンク機構、フック機構の底面図である。
【図１４】図１３のフック機構の部分拡大図である。
【図１５】オフセット部材の斜視図である。
【図１６】別角度から視たオフセット部材の斜視図である。
【図１７】図６のＡ−Ａ線断面図である。
【図１８】図６のＢ−Ｂ線断面図である。
【図１９】図７のＣ−Ｃ線断面図である。
【図２０】図７のＤ−Ｄ線断面図である。
【図２１】図７のＥ−Ｅ線断面図である。
【図２２】フックが針穴を挿通して上糸を係合したときの概略斜視図である。
【図２３】フックにより糸通ししたときの概略斜視図である。
【図２４】フックが針穴より上昇するときの要部断面図である。
【図２５】糸案内部材の部分拡大正面図である。
【図２６】フックが針穴を挿通して上糸を係合したときの要部断面図である。
【図２７】フックと糸保持ワイヤと上糸との関係を示す拡大図である。
【図２８】フック開放板カム部と糸保持ワイヤとの関係を示す拡大図である。
【符号の説明】
１ ミシン
５ 針棒
６ 針棒台
１４ 縫針
１４ａ 針穴
１５ 糸通し装置
１７ 糸通し軸
２１ カム機構
３６ 第２糸案内部材
３７ 上支持部
３７ａ 糸ガイド部
３９ 連結壁
３９ａ 糸ガイド部
３９ｂ ガード壁部
３９ｃ 糸滑り部
４０ フック
４４ 第１糸案内部材
４４ａ 糸案内部
６４ リンク機構
６９ 回動規制部材
Ｓ 上糸[0001]
BACKGROUND OF THE INVENTION
The present invention provides a threading device for a sewing machine that performs threading with a hook at the lower end of a threading shaft by lowering and rotating a threading shaft that is close to a needle bar. about The
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a sewing machine equipped with a threading device capable of easily threading a needle hole of a sewing needle has been put to practical use when sewing a work cloth to form a seam on a work cloth (Japanese Patent Laid-Open No. 11-333182). reference). In Japanese Patent Laid-Open No. 11-333182, the operator moves the operation lever downward. Let Then, when the threading shaft and the operating shaft are lowered and the sliding pin at the upper end of the threading shaft comes into contact with the locking portion on the needle bar side, the height positions of the threading shaft and the operating shaft are changed. When the operation lever is further moved downward, the sliding pin, that is, the threading shaft is rotated by a predetermined angle by the cam mechanism including the sliding pin, and the hook attached to the lower end portion of the threading shaft is needled. There has been proposed a threading device in which threading is performed after being inserted into a hole.
[0003]
In this type of threading device, in the preparatory stage before threading, the upper thread supplied from the thread spool is sequentially threaded on the needle bar thread hook, thread guide member, and thread guide tray. At the same time that the thread guide member is hooked, the upper thread is hooked on the thread guide portion of another thread guide member immediately inside the thread guide member, and the pair of thread guide members are rotated away from each other when threading. A part of the upper thread is held in a substantially horizontal direction and at a predetermined position near the needle hole, and the hook captures a part of the held upper thread.
[0004]
[Problems to be solved by the invention]
In the publication described in the above publication, the degree of freedom of the introduction portion of the yarn guide portion of the yarn guide member for hanging the upper yarn is too large, and the yarn guide member is loose about the axis of the threading shaft. When the upper thread is hooked on the guide part, the upper thread may not be hooked well on the thread guide part of the inner thread guide member. In this case, when threading, a part of the upper thread cannot be held at a predetermined position near the needle hole, and the upper thread cannot be captured by the hook, so that threading fails.
An object of the present invention is to provide a threading device for a sewing machine that can reliably hold a part of an upper thread at a predetermined position near a needle hole during threading.
[0005]
[Means for Solving the Problems]
A threading device for a sewing machine according to a first aspect of the present invention includes a threading shaft provided on a needle bar base so as to be rotatable and vertically movable in proximity to a needle bar of the sewing machine, and a sewing needle fixed to a lower end of the threading shaft. A hook that can be inserted into the needle hole, and a threading shaft that is switched to the lower limit position by operating force from the outside or the inside, and the threading shaft is rotated at the lower limit position so that the hook is inserted into the needle hole. In a threading device for a sewing machine provided with a cam mechanism that rotates by an angle, the threading device is fixed to the lower end portion of the threading shaft and is spaced from the hook by a predetermined angle around the axis of the threading shaft. A first thread guide member and a second thread guide member pivotally attached to a lower end portion of the threading shaft and connected to the first thread guide member via a link mechanism, wherein the threading shaft Part of the upper thread is held at a predetermined position near the needle hole in cooperation with the first thread guide member during movement And a second thread guide member that, the state before rotation of the threading shaft A rotation restricting member for restricting the rotation of the second thread guide member Is provided.
[0006]
In the preparatory stage before threading (before the threading shaft is rotated), the upper thread is hooked onto the needle bar thread thread, the second and first thread guide members, the thread guide tray, and then externally or internally operated. The threading shaft is switched to the lower limit position with force, and the threading shaft is rotated by the cam mechanism at the lower limit position so that the hook is inserted into the needle hole. When rotating the threading shaft, the first thread guide member and the second thread guide member cooperate to hold a part of the upper thread at a predetermined position near the needle hole, and then The hook is captured by the hook and threading is executed.
[0007]
In particular, the state before rotation of the threading shaft In , By rotation regulating member Of the second thread guide member The rotation is restricted and the second 2-thread guide member Prevents the threading shaft from rattling around the center of the threading shaft. yarn The second 2-thread guide member When you hang it on this thread The first yarn guide member can be reliably hung.
[0008]
The threading device for a sewing machine according to claim 2 is the invention according to claim 1, wherein In the state before rotation of the threading shaft, Second thread guide member Has an upper wall part and a front wall part respectively located on the upper side and the near side of the first thread guide member, A notch slit-shaped thread guide part capable of introducing an upper thread from below is formed on the front wall part. Therefore, the upper thread is notched and smoothed from below into the slit-shaped thread guide. The Can be introduced.
[0009]
A threading device for a sewing machine according to claim 3 is provided. Item 2 In this invention, a notched yarn guide portion capable of guiding the upper yarn when threading is formed on the upper wall portion of the second yarn guide member. When threading, a part of the upper thread is held across the thread guide part of the upper wall part, the thread guide part of the front wall part, and the first thread guide member, and the threading is executed.
[0010]
[0011]
Claim 4 The threading device for the sewing machine according to claim 2 is characterized in that in the invention of claim 2, the second thread guide portion. Material Is provided with a thread sliding portion that guides the upper thread from the needle bar thread hook of the needle bar to the thread guide when the upper thread is moved to the thread guide tray. When the upper thread from the needle bar thread hook is moved to the thread guide tray, the upper thread is guided along the thread sliding portion to the thread guide portion, so that the threading is further ensured.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the present invention is applied to a threading device provided in an electronically controlled sewing machine provided with a needle bar vertical movement mechanism, a needle bar swinging mechanism, and the like. In the following description, the front, rear, left, and right viewed from the person operating the sewing machine will be described as front, back, left, and right.
[0013]
As shown in FIGS. 1 to 4, the electronically controlled sewing machine 1 includes a bed portion 2, a pedestal portion 3 erected on the right end portion of the bed portion 2, and a left side from the upper end of the pedestal portion 3. It has the arm part 4 extended. A needle bar base 6 that supports the needle bar 5 so as to be movable up and down is arranged on the head of the arm part 4 in an upright direction, and an upper end part of the needle bar base 6 is supported swingably on the sewing machine frame 7. Has been.
[0014]
The needle bar vertical movement mechanism 8 will be briefly described. As shown in FIG. 4, a balance crank 10 of a balance mechanism (not shown) is provided at the left end portion of the main shaft 9, and a crank pin 11 is attached to the balance crank 10. The needle bar crank rod 12 is connected via a pivot. A needle bar holder 13 is fixed to a substantially middle portion of the needle bar 5, a needle bar crank rod 12 is connected to the needle bar holder 13, and the main shaft 9 is rotationally driven by a sewing machine motor at the time of sewing. As a result, the needle bar 5 is reciprocated up and down. Since a needle bar swinging drive mechanism for swinging and driving the sewing needle 14 via the needle bar base 6 by a stepping motor or the like is a general one, its description is omitted.
[0015]
Although not shown in the drawings, the vertical pillar 3 has a substantially vertical axis, and the vertical axis is linked to the main shaft 9 via a gear mechanism. It is transmitted to the supplementary hook. Similar to a general electronically controlled sewing machine, the work cloth is sewn by the cooperation of the sewing needle 14, the thread supplement hook and the cloth feed mechanism driven by the stepping motor.
[0016]
Next, the threading device 15 for threading the upper thread S through the needle hole 14a of the sewing needle 14 will be described.
As shown in FIGS. 3 to 11, the threading device 15 includes the needle bar base 6, a threading slider 16 as an operation body provided on the needle bar base 6 so as to be movable up and down, and a threading shaft 17. The slider guide shaft 18, the hook mechanism 19, the positioning mechanism 20, the cam mechanism 21, and the hook rotation restricting mechanism 22 are provided.
[0017]
As shown in FIGS. 4 to 7, the needle bar base 6 will be described. The needle bar base 6 has a front wall portion 23 and a left wall portion 24, and extends rearward at the lower end and the upper end of the front wall portion 23. The lower support portion 25 and the upper support portion 26 are integrally formed. A pivot arm 27 that extends upward from the upper support 26 is formed at the upper end of the left wall 24, and a left and right axial member 28 is fixed to the upper end of the pivot arm 27. The shaft member 28 is connected to a pivotal metal fitting 29 having a U-shape in plan view with an open front surface so as to be able to swing back and forth.
[0018]
The pivotal support metal 29 is supported by the sewing machine frame 7 through a horizontal support shaft 30 in the front-rear direction so as to be able to swing left and right. Accordingly, the needle bar base 6 is supported by the sewing machine frame 7 so as to be swingable in the front-rear direction and the left-right direction. However, a tension coil spring 31 is interposed between the needle bar base 6 and the machine frame 7, and the lower end side portion of the needle bar base 6 is urged backward. The position of the needle bar base 6, that is, the sewing needle 14 in the front-rear direction can be adjusted by the adjustment screw 32 and the urging force of the tension coil spring 31.
[0019]
The needle bar 5 is inserted and supported by the upper support part 26 and the lower support part 25 so as to be vertically movable, and a sewing needle 14 is detachably attached to the lower end of the needle bar 5. In the needle bar 5, a threading positioning member 33 as a locking portion is fixed immediately above the needle bar holder 13. The threading shaft 17 and the slider guide shaft 18 will be described. As shown in FIGS. 4 to 11, the upper support portion 26 and the lower support portion 25 of the needle bar base 6 are threaded on the left side of the needle bar 5. The shaft 17 and the slider guide shaft 18 are supported so as to be movable up and down. The upper end portion of the threading shaft 17 is inserted into the gap between the pivotal support metal 29 and the shaft member 28 at the uppermost position, and a substantially middle step portion of the threading shaft 17 serves as a locked portion protruding in the horizontal direction. The sliding pin 34 is fixed.
[0020]
As shown in FIGS. 4 and 6 to 13, a synthetic resin hook holding member 35 is fixed to the lower end portion of the threading shaft 17. Further, the lower end portion of the threading shaft 17 is substantially U-shaped in side view. A second thread guide member 36 (see FIG. 3) having a shape is rotatably supported with the upper support portion 37 and the lower support portion 38 as upper wall portions corresponding to the upper and lower sides of the hook holding member 35, respectively. ing. Of the second thread guide member 36, the upper support part 37 is formed with a notched thread guide part 37a (see FIG. 11) capable of guiding the upper thread S during threading. A vertical connecting wall 39 (corresponding to the front wall portion) that connects the upper support portion 37 and the lower support portion 38 is formed with a notched slit-like yarn guide portion 39a into which the upper yarn S can be introduced from below. Has been. Further, a yarn sliding portion 39c for introducing the upper yarn S into the yarn guide portion 39a is formed. In the present embodiment, the slit-shaped thread guide portion having a narrow entrance and a wide interior is used, but a tapered slit-shaped thread guide portion that gradually narrows from the entrance to the interior may be used.
[0021]
As shown in FIGS. 7 to 14, 22 to 24, and 26 to 28, a hook mechanism 19 is fixed to the hook holding member 35, and the hook mechanism 19 is attached to the hook 40 and both sides of the hook 40. The two guide members 41 and 42 that are positioned, and the hook 40 and the thread holding wire 43 that penetrates the guide members 41 and 42 horizontally are formed. A hook portion 40a is formed at the tip of the hook 40. When the thread is threaded, the hook portion 40a is inserted into the needle hole 14a, and the sewing needle 14 is positioned immediately before the needle hole 14a while being guided by the guide members 41 and 42. The upper thread S is hooked.
[0022]
A first thread guide member 44 is integrally fixed to the hook holding member 35. A portion near the tip of the first thread guide member 44 is bent downward, and the bent portion functions as a thread guide portion 44a. Yes. The first thread guide member 44 is disposed at a predetermined angle around the axis of the threading shaft 17 with respect to the hook 40. That is, the first thread guide member 44 and the hook mechanism 19 are integrally provided on the threading shaft 17 while maintaining a certain positional relationship. In the state before the threading shaft 17 is rotated, the upper support portion 37 and the connecting wall 39 of the second thread guide member 36 are located on the upper side and the near side of the first thread guide member 44, respectively, and the second thread The connecting wall 39 of the guide member 36 is provided with a guard wall portion 39 b that covers at least the front side of the yarn guide portion 44 a of the first yarn guide member 44.
[0023]
Next, the cam mechanism 21 that rotates the threading shaft 17 at its lower limit position will be described.
As shown in FIGS. 3 to 7 and FIGS. 17 to 21, a synthetic resin threading slider 16 (corresponding to an operating body) moves up and down substantially in the middle of the threading shaft 17 and the slider guide shaft 18. It is fitted externally. The threading slider 16 includes a guide portion 45 that is externally fitted to the slider guide shaft 18 so as to be movable up and down, and a guide tube portion 46 that is externally fitted to the threading shaft 17 so as to be movable up and down and is integrally formed with the guide portion 45. And a slider lever portion 47 extending upward from the left end of the guide portion 45. As for the guide cylinder part 46, the outer peripheral wall part 48 of the left half part is connected with the guide part 45 perpendicularly, and most of the outer peripheral parts of a right half part are formed in the notch shape.
[0024]
As shown in FIGS. 3 to 7, 18, and 20, a spiral threading slider cam portion 48 a (hereinafter referred to as a cam portion 48 a) is formed on the outer peripheral wall portion 48, and the threading portion is passed through the cam portion 48 a. The rear end of the sliding pin 34 of the shaft 17 is engaged. That is, by moving the threading slider 16 up and down with respect to the threading shaft 17, the sliding pin 34 moves along the cam portion 48a, and the threading shaft 17 rotates. On the threading shaft 17, a pin 49 as a locked portion is fixed in a horizontally penetrating manner below the sliding pin 34 by a certain length (below the cam mechanism 21), and the guide tube portion 46 and the pin 49 are fixed. The compression coil spring 50 is packaged between the two. A compression coil spring 51 for energizing the threading slider 16 upward is provided between the guide portion 45 and the lower support portion 25 of the needle bar base 6 in the slider guide shaft 18.
[0025]
Next, the positioning mechanism 20 will be described.
As shown in FIGS. 5 to 7 and FIGS. 15 to 21, the positioning mechanism 20 sets the lowering limit position (see FIG. 17) of the threading shaft 17 to a position where the heights of the hook 40 and the needle hole 14a coincide. This is a regulating mechanism, and is composed of the threading positioning member 33 provided on the needle bar 5, a pin 49, a positioning offset member 52, and the like.
Here, the positioning offset member 52 will be described. As shown in FIGS. 3 to 7, 15, and 16, in the threading shaft 17, the upper support portion 26 and the lower support portion 25 of the needle bar base 6 Between them, a positioning offset member 52 having a length of about ¾ of the height between the upper support portion 26 and the lower support portion 25 is mounted so as to be movable up and down and to rotate integrally with the threading shaft 17. . The offset member 52 includes an upper support portion 53, a lower support portion 54, a vertical connection wall 55 that partially connects the upper support portion 53 and the lower support portion 54, and the like.
[0026]
As shown in FIGS. 15 and 16, the upper support portion 53 is formed with a protrusion 53 a that slightly protrudes at the right rear end side, and the protrusion 53 a is configured to be able to contact the threading positioning member 33 from above. Has been. The upper support portion 53 is configured such that the guide tube portion 46 of the threading slider 16 can be brought into contact with or separated from the upper support portion 53. The guide tube portion 46 is in contact with the portion 53, and the upper support portion 53 is in contact with the upper support portion 26 of the needle bar base 6.
[0027]
A vertical slit 55a for holding the pin 49 so that it can be guided is formed in the lower half of the connecting wall 55, and a receiving portion 56 for receiving the pin 49 is provided at the bottom of the vertical slit 55a, that is, the lower end of the offset member 52. . In the standby state, the pin 49 is located above the vertical slit 55 a by the urging force of the compression coil spring 51, and is received by the receiving portion 56 when it is at the lowest position of the threading shaft 17.
[0028]
When threading, as shown in FIGS. 12 to 14, 22 to 24, and 26 to 28, the hook mechanism 19 is rotated in a direction approaching the sewing needle 14, and the hook 40 is inserted into the needle hole 14a. To do. At the same time, the first thread guide member 44 is rotated in a clockwise direction (a direction away from the sewing needle 14) when viewed from above in synchronization with the hook mechanism 19. When threading, the second threading shaft 17 is rotatably supported at the lower end of the threading shaft 17. 2 A link mechanism 64 that rotates the yarn guide member 36 in a direction away from the first yarn guide member 44 is also provided.
[0029]
That is, in the standby state before the threading shaft 17 rotates for threading, 2 The yarn guide member 36 is in a forward-facing posture, and the yarn guide portion 44 a of the first yarn guide member 44 is connected to the yarn guide of the connecting wall 39. Part It is located just inside 39a. Further, as shown in FIGS. 8 to 13, the hook release plate 68 for allowing the hook portion 40 a to open after the hook portion 40 a ascends while holding the upper thread S together with the yarn holding wire 43 is provided on the needle bar base 6. Screws (α) are fixed to the lower support portion 25 downward. A rotation restricting member 69 that restricts the rotation of the second thread guide member 36 is integrally formed in the upper half of the hook release plate 68. The rotation restricting member 69 is formed in an inclined plate shape that slightly protrudes obliquely downward, and in contact with the link plate 70 of the link mechanism 64 before the threading shaft 17 rotates, the link mechanism 64 operates. The rotation of the second yarn guide member 36 is restricted by stopping the rotation.
[0030]
When the threading shaft 17 is rotated after being lowered to the lowering limit position, the hook mechanism 19 and the first thread guide member 44 are integrally rotated in a clockwise direction in a plan view, and via the link mechanism 64. Thus, the second thread guide member 36 rotates counterclockwise. That is, the second thread guide member 36 moves away from the first thread guide member 44 and moves closer to the hook mechanism 19. In the vicinity of the link mechanism 19, a support plate 65 and a thread guide tray 66 for pinching the upper thread S are also provided.
[0031]
Next, the hook rotation restricting mechanism 22 will be described.
As shown in FIGS. 4, 6, 7, 15, and 16, the rotation restricting mechanism 22 allows the offset member 52 and the threading shaft 17 to rotate when the needle bar 5 is above a predetermined position. Further, when the needle bar 5 is below the predetermined position, it is a mechanism for prohibiting the rotation of the offset member 52 and the threading shaft 17. By the way, since the pin 49 is held in the longitudinal slit 55a of the offset member 52 so that it can be guided, the offset member 52 rotates together with the threading shaft 17 through the operation of the cam mechanism 21. The connecting wall 55 of the offset member 52 is integrally formed with a stopper portion 57 protruding in a column shape. However, the upper end of the stopper portion 57 is provided with a lateral slit 58 that is notched so that the engaging portion 33a of the threading positioning member 33 can pass therethrough.
[0032]
When the needle bar 5 is above a predetermined position, the threading slider 16 is lowered integrally with the threading shaft 17, the slider guide shaft 18, and the offset member 52, and the upper support portion 53 of the offset member 52 is threaded and positioned. Then, the offset member 52 rotates integrally with the threading shaft 17 through the operation of the cam mechanism 21 at the lower limit position of the threading shaft 17. At this time, the rotation of the offset member 52 and the threading shaft 17 is permitted when the engaging portion 33a passes through the lateral slit 58 in a state where the upper support portion 53 is in contact with the threading positioning member 33. When the needle bar 5 is below the predetermined position, the locking portion 33a of the threading positioning member 33 is blocked by the stopper portion 57 and the rotation of the offset member 52 and the threading shaft 17 is prohibited.
[0033]
Next, the operation lever 59 and the like will be described.
As shown in FIGS. 1 to 4, a lever shaft 60 is supported on the machine casing 7 in the vertical direction, and a frame 61 is externally mounted on the lever shaft 60 so as to be movable up and down. The tip of the slider lever portion 47 of the threading slider 16 is fitted to the right end portion of the frame 61, and the operation lever 59 is fixed to the left end portion of the frame 61 so as to be exposed to the left side of the arm portion 4 through the slit 62. ing. However, a tension coil spring 63 is interposed between the machine frame 7 and the frame 61, and the frame 61, that is, the operation lever 59 is urged upward.
[0034]
Next, the operation of the threading device 15 described above will be described.
When the needle bar 5 is above the predetermined position, the hook rotation restricting mechanism 22 does not act, so the upper thread S can be threaded through the needle hole 14a of the sewing needle 14. In this case, as shown in FIGS. 10 and 25, first, the upper thread S supplied from a thread spool (not shown) is hung on the needle bar thread hook 67, the thread guide 39a, and the thread guide tray 66. At this time, by hooking the upper thread S from the needle bar thread hook 67 to the thread guide tray 66, the upper thread S is smoothly and automatically introduced from below into the thread guide portion 39a formed on the connecting wall 39. The thread guide 44a of the first thread guide member 44 is automatically hooked.
[0035]
Further, at this time, the rotation restricting member 69 restricts the rotation of the second thread guide member 36 and prevents the second thread guide member 36 from rattling around the axis of the threading shaft 17. When the second thread guide member 36 is hung, the upper thread S can be reliably hung on the first thread guide member 44. Next, when the operation lever 59 is lowered, the threading slider 16 descends against the urging force of the tension coil spring 63, and the threading shaft 17, the slider guide shaft 18, and the offset member 52 also descend integrally.
[0036]
Next, the offset member 52 comes into contact with the threading positioning member 33 and stops. When the operation lever 59 is further lowered in this state, the pin 49 is lowered along the vertical slit 55a and received by the receiving portion 56 and stopped. To do. That is, the threading shaft 17 is lowered to the lower limit position. At this time, the lowering limit position of the threading shaft 17 is regulated by the positioning mechanism 20 to a position where the heights of the hook 40 and the needle hole 14a of the sewing needle 14 coincide.
[0037]
When the operation lever 59 is further lowered, the threading shaft 17 is rotated by the cam mechanism 21 and the hook 40 is inserted into the needle hole 14a of the sewing needle 14 to catch the upper thread S. At this time, since the thread holding wire 43 comes into contact with the sewing needle, the hook portion 40a is opened. At this time, the operation lever 59 is stopped at the lowest position. Next, when the operation lever 59 is released, the hook 40 is pulled out of the needle hole 14a while holding the upper thread S by the hook 40a, and at the same time, the hook 40a is closed by the thread holding wire 43 and the upper thread S is hooked. Do not fall off 40a. Next, the threading slider 16 and the offset member 52 are lifted by the urging force of the compression coil springs 50 and 51 to return to the initial standby state.
[0038]
At this time, the hook portion 40a rises while holding the upper thread S (see FIG. 24). Thereafter, the thread holding wire 43 abuts on the hook release plate cam portion 71 to release the hook 40, and the threading through the needle hole 14a is completed by pulling the formed loop of the upper thread S. When the needle bar 5 is below the predetermined position, the rotation restricting mechanism 22 acts. That is, the locking portion 33a of the threading positioning member 33 is blocked by the stopper portion 57 and prohibits the rotation of the offset member 52 and the threading shaft 17, so that threading is prohibited.
[0039]
As described above, according to the threading device 15 described above, the second thread guide member 36 is located on the upper side and the near side of the first thread guide member 44 before the threading shaft 17 is rotated. 37 and the connecting wall 39, and the guard wall 39b that covers at least the front side of the yarn guiding portion 44a of the first yarn guiding member 44 is provided on the connecting wall 39 of the second yarn guiding member 36. When the needle thread S is hung on the second thread guide member 36, the upper thread S is securely introduced to the thread guide part 44a of the first thread guide member 44 without being introduced from the second thread guide member 36 along the guard wall 39b. Can be hung. Therefore, a part of the upper thread S can be securely held at a predetermined position near the needle hole 14a during threading, and the reliability of the threading device 15 is increased.
[0040]
Since the notched slit-shaped thread guide portion 39a into which the upper thread S can be introduced from below is formed on the connecting wall 39 of the second thread guide member 36, the upper thread S is lowered to the notched slit-shaped thread guide portion 39a. Can be introduced smoothly. Since the upper thread support 37 of the second thread guide member 36 is formed with a notched thread guide 37a capable of guiding the upper thread S during threading, the thread guide of the upper support 37 when threading. Part of the upper thread S is held across the portion 37a, the yarn guide portion 39a of the connecting wall 39, and the first yarn guide member 44, and the threading is executed.
[0041]
Before the threading shaft 17 is rotated, the rotation restricting member 69 restricts the rotation of the second thread guiding member 36, and the second thread guiding member 36 rattles around the axis of the threading shaft 17. When the upper thread S is hung on the second thread guide member 36, the upper thread S can be reliably hung on the first thread guide member 44.
[0042]
Next, a modified embodiment in which the present embodiment is partially modified will be described.
1) In this embodiment, the threading shaft 17 is switched to the lower limit position by a manual operation force from the outside of the arm unit 4, but an actuator such as a motor is provided inside the arm unit 4, and this motor The threading shaft 17 may be switched to the lower limit position by a driving force (that is, an operating force).
[0043]
2) The guard wall portion may be separately formed and joined to the connecting wall 39 of the second yarn guide member 36.
3) The rotation restricting member 69 may be provided on the lower support portion 25 of the needle bar base 6 separately from the hook release plate 68. In addition, various modifications can be added to the above-described embodiment without departing from the spirit of the present invention.
[0044]
【The invention's effect】
According to invention of Claim 1, the state before rotation of the threading shaft In , Second thread guide member Rotation restricting member that restricts rotation So that The second thread guide member can be prevented from rattling around the axis of the threading shaft, When hanging the upper thread on the second thread guide member, The second 1 thread guide member can be reliably hung. Therefore, a part of the upper thread can be reliably held at a predetermined position near the needle hole during threading, and the reliability of the threading device is increased.
[0045]
According to the second aspect of the present invention, since the notched slit-shaped thread guide portion into which the upper thread can be introduced from below is formed on the front wall portion of the second thread guide member, the upper thread is notched and the slit-shaped thread is formed. Smooth from below to the guide The Can be introduced. Other effects similar to those of the first aspect are obtained.
[0046]
According to the invention of claim 3, since the notched thread guide portion capable of guiding the upper thread when threading is formed on the upper wall section of the second thread guide member, the upper wall is formed when threading. Part of the upper thread is held across the thread guide part of the part, the thread guide part of the front wall part and the first thread guide member, and the threading is executed. Other billing Item 2 Has the same effect as.
[0047]
[0048]
Claim 4 According to the invention, when the upper thread coming from the needle bar thread hook is moved to the thread guide tray, the upper thread is guided along the thread sliding portion to the thread guide portion, so that the threading is further ensured. Become. Other effects similar to those of the second aspect are achieved.
[Brief description of the drawings]
FIG. 1 is a front view of an electronically controlled sewing machine according to an embodiment of the present invention.
FIG. 2 is a side view of the sewing machine.
FIG. 3 is a partially cutaway side view of the sewing machine showing the internal structure of the threading device.
FIG. 4 is a cross-sectional view of a main part of an arm part.
FIG. 5 is a perspective view of the threading device.
FIG. 6 is a front view of the threading device.
FIG. 7 is a view corresponding to FIG. 6 at a lowering limit position of the threading shaft.
FIG. 8 is an enlarged side view of the hook mechanism and the vicinity of the sewing needle.
FIG. 9 is an enlarged rear view of the vicinity of the hook mechanism and the needle bar.
FIG. 10 is a front view of the vicinity of the hook mechanism and the needle bar showing the preparation stage before threading.
FIG. 11 is a view corresponding to FIG. 10 at a threading stage.
FIG. 12 is a bottom view of the link mechanism and the hook mechanism.
FIG. 13 is a bottom view of the link mechanism and the hook mechanism at the threading stage.
14 is a partially enlarged view of the hook mechanism of FIG.
FIG. 15 is a perspective view of an offset member.
FIG. 16 is a perspective view of the offset member viewed from another angle.
17 is a cross-sectional view taken along line AA in FIG.
18 is a sectional view taken along line BB in FIG.
19 is a cross-sectional view taken along the line CC of FIG.
20 is a cross-sectional view taken along the line DD of FIG.
21 is a cross-sectional view taken along the line EE of FIG.
FIG. 22 is a schematic perspective view when the hook is inserted through the needle hole to engage the upper thread.
FIG. 23 is a schematic perspective view when threading with a hook.
FIG. 24 is a cross-sectional view of the main part when the hook is lifted from the needle hole.
FIG. 25 is a partially enlarged front view of the yarn guide member.
FIG. 26 is a cross-sectional view of the main part when the hook is inserted through the needle hole to engage the upper thread.
FIG. 27 is an enlarged view showing a relationship among a hook, a thread holding wire, and an upper thread.
FIG. 28 is an enlarged view showing the relationship between the hook release plate cam portion and the yarn holding wire.
[Explanation of symbols]
1 Sewing machine
5 Needle bar
6 Needle bar base
14 Sewing needles
14a Needle hole
15 Threading device
17 Threading shaft
21 Cam mechanism
36 Second thread guide member
37 Upper support
37a Yarn guide part
39 Connecting wall
39a Yarn guide part
39b Guard wall
39c Yarn sliding part
40 hooks
44 First thread guide member
44a Thread guide
64 Link mechanism
69 Rotation restricting member
S Upper thread
Claims (4)
前記糸通し軸の下端部に固定され且つフックに対して糸通し軸の軸心回りに所定角度離隔して配設された第１糸案内部材と、
前記糸通し軸の下端部に回動自在に枢着されリンク機構を介して第１糸案内部材に連結された第２糸案内部材であって、糸通し軸の回動時に第１糸案内部材と協働して上糸の一部を針穴付近の所定位置に保持する第２糸案内部材とを備え、
前記糸通し軸の回動前の状態において、第２糸案内部材の回動を規制する回動規制部材を設けたことを特徴とするミシンの糸通し装置。A threading shaft provided on the needle bar base so as to be able to rotate and move up and down close to the needle bar of the sewing machine, a hook that is fixed to the lower end of the threading shaft and can be inserted into the needle hole of the sewing needle, A cam mechanism that switches the threading shaft to the lower limit position by an operating force from the inside, and rotates the threading shaft at the lower limit position so that the hook is inserted through the needle hole by a predetermined angle. In the threading device of the sewing machine,
A first thread guide member fixed to the lower end portion of the threading shaft and disposed at a predetermined angle around the axis of the threading shaft with respect to the hook;
A second thread guide member pivotally attached to a lower end portion of the threading shaft and connected to the first thread guide member via a link mechanism, wherein the first thread guide member is rotated when the threading shaft is rotated. A second thread guide member for holding a part of the upper thread in a predetermined position near the needle hole in cooperation with
A threading device for a sewing machine, comprising a rotation restricting member for restricting rotation of the second thread guide member in a state before the threading shaft is rotated.
前記前壁部に、下方から上糸を導入可能な切欠きスリット状の糸ガイド部を形成したことを特徴とする請求項１に記載のミシンの糸通し装置。In a state before the threading shaft is rotated, the second thread guide member has an upper wall part and a front wall part respectively positioned on the upper side and the near side of the first thread guide member,
2. The threading device for a sewing machine according to claim 1, wherein a notched slit-shaped thread guide part capable of introducing an upper thread from below is formed in the front wall part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000398660A JP4465877B2 (en) | 2000-12-27 | 2000-12-27 | Sewing machine threading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000398660A JP4465877B2 (en) | 2000-12-27 | 2000-12-27 | Sewing machine threading device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002200387A JP2002200387A (en) | 2002-07-16 |
| JP4465877B2 true JP4465877B2 (en) | 2010-05-26 |
Family
ID=18863584
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000398660A Expired - Fee Related JP4465877B2 (en) | 2000-12-27 | 2000-12-27 | Sewing machine threading device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4466348B2 (en) | 2004-12-02 | 2010-05-26 | ブラザー工業株式会社 | Sewing machine threading device and sewing machine |
| JP4139843B2 (en) | 2007-01-25 | 2008-08-27 | 株式会社ジャガーインターナショナルコーポレーション | Sewing machine threading device |
| US8087366B2 (en) | 2008-01-18 | 2012-01-03 | Brother Kogyo Kabushiki Kaisha | Needle threader for sewing machine |
| JP6195752B2 (en) * | 2013-07-10 | 2017-09-13 | 蛇の目ミシン工業株式会社 | Sewing machine thread holding mechanism, sewing machine threading device, and sewing machine |
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2000
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| JP2002200387A (en) | 2002-07-16 |
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