JP4109147B2

JP4109147B2 - Yarn supply device for decorative sewing machine

Info

Publication number: JP4109147B2
Application number: JP2003101896A
Authority: JP
Inventors: 孝一佐久間; 徹佐久間
Original assignee: Suzuki Manufacturing Co Ltd
Current assignee: Suzuki Manufacturing Co Ltd
Priority date: 2003-04-04
Filing date: 2003-04-04
Publication date: 2008-07-02
Anticipated expiration: 2023-04-04
Also published as: JP2004305381A

Description

【０００１】
【発明の属する技術分野】
この発明は飾り縫いミシンの糸供給装置に係り、特に糸調子作業を不要にして、布に縫目形成を行なう縫目形成装置に縫糸を供給できる飾り縫いミシンの糸供給装置に関する。
【０００２】
【従来の技術】
従来から、上ルーパ糸張力および下ルーパ糸張力をそれぞれ設定して上ルーパ糸および下ルーパ糸の縫目結節点の位置を変化させて波形状（サインカーブ形状）の飾り縫い縫製が行なわれている。
【０００３】
このため、糸張力を糸調子器の制御により自動的に調整するメカニカル機構を有するアタッチメント装置をミシンとは別個に設け、アタッチメント装置をミシンに外付けして波形状（サインカーブ形状）の飾り縫い縫製を行うミシンが知られている（例えば、特許文献１参照）。
【０００４】
さらに、糸調子器の糸張力をパルスモータで制御するコンピュータオーバーロック飾り縫いミシンが知られている（例えば、特許文献２参照）。
【０００５】
【特許文献１】
実開昭５４−５４４６８号公報（第１−５頁、第１図、第２図）
【特許文献２】
特開２００２−３１５９８４号公報（第４−１０頁、第１−１２図）
【０００６】
【発明が解決しようとする課題】
しかしながら、これらのミシンでは、糸調子器の制御により糸張力を設定しているため縫糸の種類、縫糸の太さ、布厚、縫幅などに応じてマニュアル操作で補正調整が必要になり、このマニュアル操作と縫目の仕上りの対応がとりづらいという難点がある。
【０００７】
本発明は、このような難点を解消するためになされたもので、複数本の縫糸をその縫目結節点の位置が変化するように１縫目に必要な縫糸量として供給することができ、而も機構が簡素化され製造の精度を確保でき、また耐久性も向上し、高速縫製に対応できる飾り縫いミシンの糸供給装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
このような目的を達成する本発明の飾り縫いミシンの糸供給装置は、布に縫目形成を行なう縫目形成装置に複数本の縫糸を供給する飾り縫いミシンの糸供給装置であって、糸巻から給糸される縫糸を把持し、縫目形成装置により縫目形成時に閉成され、布の布送り時に開成される上流側把持器と、上流側把持器から導かれた縫糸を把持し、縫目形成時に開成されて縫糸が縫目形成装置により引出され、布の布送り時に閉成される下流側把持器と、縫目形成装置と同期して駆動され、布の布送り時に開成された上流側把持器および閉成された下流側把持器間に延びる糸道の縫糸を縫目形成装置の１縫目に必要な縫糸量として偏倚し、縫目形成時に縫糸を解放する定型縫い振動子と、縫目形成装置と同期して駆動され、布の布送り時に開成された上流側把持器および閉成された下流側把持器間に延びる糸道の少なくとも２本の縫糸の一方の縫糸量と他方の縫糸量の和が一定で、一方の縫糸量が増加するに伴い他方の縫糸量が減少して１縫目に必要な各縫糸の縫糸量を変化させるように偏倚し、縫目形成時に縫糸を解放する変形縫い振動子とを備えている。
【０００９】
このような本発明の飾り縫いミシンの糸供給装置が備えた変形縫い振動子の偏倚量は２（Ｗ＋ｔ／２）に設定されている。あるいは、変形縫い振動子の偏倚量は２（２Ｗ＋ｔ）に設定されている。（但し、Ｗはかがり幅、ｔは布厚さとする。）
本発明の飾り縫いミシンの糸供給装置は、定型縫い振動子および変形縫い振動子を１縫目毎に所定の変速比をもって駆動する変速機構と、定型縫い振動子を作動させるときは変速機構の駆動側と従動側を遮断し、定型縫い振動子および変形縫い振動子を作動させるときは変速機構の駆動側から従動側へ伝達するクラッチとを有する。
【００１０】
本発明の飾り縫いミシンの糸供給装置は、定型縫い振動子を作動させるときは変形縫い振動子が偏倚しないように固定する固定部材を有する。
【００１１】
本発明の飾り縫いミシンの糸供給装置は、定型縫い振動子の作動と定型縫い振動子および変形縫い振動子の作動とをクラッチで切換える切換ツマミを有する。
【００１２】
このような飾り縫いミシンの糸供給装置において、布送り時は、縫目形成装置に連動して上流側把持器が開成され、下流側把持器が閉成されるので、この間に定型縫い振動子が上流側把持器および下流側把持器間に延びる糸道の縫糸を偏倚すると共に変形縫い振動子がさらに１縫目に必要な縫糸の縫糸量を変化させるように偏倚することにより、縫目形成装置の１縫目に必要な縫糸量を確保し、また、縫目形成時は、縫目形成装置に連動して上流側把持器が閉成され、下流側把持器が開成されるので、この間に各振動子が上流側把持器および下流側把持器間に延びる糸道の縫糸を開放することにより、縫目形成装置の１縫目に必要な縫糸量を供給することができると共に、２本の縫糸の一方の縫糸量が増加するに伴い他方の縫糸量が減少するので、この縫糸の縫目結節点の位置を変化させることができる。
【００１３】
【発明の実施の形態】
以下、本発明の飾り縫いミシンの糸供給装置の好ましい実施の形態例について図面を参照して説明する。
【００１４】
本発明の糸供給装置が組み込まれる飾り縫いミシンは図１に示すように、機枠１に、はずみ車２に固定された駆動軸３が軸承されている。はずみ車２はモータＭによってタイミングベルトＢを介して回転駆動される。また、機枠１に枢支された針駆動腕６のＵ字形の先端部６ａには連結ピン１０により針留リンク７が枢支されている。針留リンク７は機枠１に固定された案内棒１１に摺動可能に取り付けられた針留８に連結ピン１２により枢着されている。針留８は２本の縫針９Ａ、９Ｂを固定できるように構成されている。
【００１５】
また、駆動軸３と連動可能な機構で構成され、主送り歯および副送り歯（図示せず）がそれぞれ布送り方向に前後するように針板９３７の送り窓に対して配設されて布を布送りする縫目送り調節部９００を有している。この縫目送り調節部９００には、主送りを調節するための送り目調節ダイヤル９３０が設けられ、副送りを調節するために差動調節レバー９４０が設けられている。なお、この縫目送り調節部９００は公知技術（特開平１０−２７２２７３号公報掲載）なので詳しい説明は省略する。
【００１６】
このような縫目送り調節部９００の主送り歯および副送り歯は、機枠１に摺動可能に取着された押棒１０５１の先端に固定された布押え１０５０によって針板９３７に押えられた布を、適切な布送り量で移動させることができる。
【００１７】
また、飾り縫いミシンには、縫製直前に布の縁を切りそろえるためのメス駆動機構３６で布切り幅（メス切り幅）を変更するために、縫幅調節部８００を有している。この縫幅調節部８００には、縫幅調節ダイヤル８０２が設けられている。なお、この縫幅調節部８００は公知技術（特開平１０−２７２２７３号公報掲載）なので詳しい説明は省略する。
【００１８】
このように構成された飾り縫いミシンの縫目形成装置１００の右縫針９Ｂ、上ルーパ２７、下ルーパ２１により、布に飾り縫いの縫目形成を行なう。この縫目形成装置１００の右縫針９Ｂ、上ルーパ２７、下ルーパ２１に各縫糸を供給するために糸供給装置が使用される。
【００１９】
この糸供給装置は図１、図２に示すように、糸巻から給糸される糸を把持し、縫目形成装置１００により縫目形成時に閉成され、布の布送り時に開成される第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０を備えている。
【００２０】
第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０は図１、図２、図３、図４、図５に示すように、それぞれ機枠１に固定された糸供給ユニット基板５０１に固着される５つの上流側把持器支板４３それぞれに枢着される上流側把持軸４２と、上流側把持軸４２に一対の把持皿４４、加圧ばね受け４５、圧縮ばね４６、スラスト受け４７、ばね受け４８とを有している。なお、５つの上流側把持器支板４３のなかで第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０が設けられる４つの上流側把持器支板４３は、上流側糸供給ユニット板６３０を介して糸供給ユニット基板５０１に固着されているが、直接、糸供給ユニット基板５０１に固着してもよい。
【００２１】
この一対の把持皿４４、加圧ばね受け４５、圧縮ばね４６、スラスト受け４７およびばね受け４８はセットで上流側把持器支板４３間にそれぞれ設けられている。具体的には、上流側把持軸４２に軸着された加圧ばね受け４５とばね受け４８との間に圧縮ばね４６が介在されている。また、上流側把持軸４２には一対の把持皿４４と加圧ばね受け４５との間にスラスト受け４７が螺着されている。このスラスト受け４７は布送り時に各糸を開放するために、加圧ばね受け４５を介して一対の把持皿４４を所定位置に停止させるものである。
【００２２】
また、糸供給装置は、第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０からそれぞれ導かれる各糸を把持し、縫目形成時に開成されて各糸が縫目形成装置１００により引出され、布の布送り時に閉成される第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０を備えている（図２）。
【００２３】
第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０は、それぞれ図１、図２、図５、図６、図７に示すように、機枠１に固定された糸供給ユニット基板５０１に偏倚子支軸５１１、スペーサ５１２と、振動子支軸５０８Ａ、スペーサ５０９Ａと、振動子支軸５０８Ｂ、スペーサ５０９Ｂと、偏倚子支軸５２１、スペーサ５２２とを介して結合ねじ５１０で固定される糸供給ユニット前板５０２に設けられている。このような第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０は、糸供給ユニット前板５０２に固着された５つの下流側把持器支板７３それぞれに枢着される下流側把持軸７２と、この下流側把持軸７２に一対の把持皿４４、加圧ばね受け４５、圧縮ばね４６、スラスト受け４７、ばね受け４８とを有している。
【００２４】
この一対の把持皿４４、加圧ばね受け４５、圧縮ばね４６、スラスト受け４７およびばね受け４８はセットで下流側把持器支板７３間にそれぞれ設けられている。具体的には、下流側把持軸７２に軸着された加圧ばね受け４５とばね受け４８との間に圧縮ばね４６が介在されている。また、下流側把持軸７２には一対の把持皿４４と加圧ばね受け４５との間にスラスト受け４７が螺着されている。このスラスト受け４７は縫目形成時に各糸を開放するために、加圧ばね受け４５を介して一対の把持皿４４を所定位置に停止させるものである。
【００２５】
また、糸供給装置は図２、図４、図７に示すように、第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０を縫目形成時に閉成し、布の布送り時に開成し、第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０を縫目形成時に開成し、布の布送り時に閉成する糸供給駆動部３００を備えている。この糸供給駆動部３００は、駆動軸３（図１）に固着された糸供給駆動部プーリ３０１の回転を、タイミングベルト３０３を介して第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０、および第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０へ伝達するものである。
【００２６】
このような糸供給駆動部３００は、糸供給駆動部プーリ３０１の回転を伝達するタイミングベルト３０３が巻き掛けられる糸供給駆動軸プーリ３０２が、糸供給ユニット基板５０１に固着された一対の第１糸供給駆動軸受３０５Ａ、３０５Ａ’に軸支される糸供給駆動軸３０４の一端に固着され、この糸供給駆動軸３０４の他端には正面カムが形成された糸把持駆動カム３０７が固着されている。糸把持駆動カム３０７の正面カムは縫目形成時に第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０を閉成し、各糸を把持し、布の布送り時に開成するよう縫目形成装置１００と同期するように形成されている。
【００２７】
このような第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０、および第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０をそれぞれ閉成、開成するために、糸供給駆動部３００は把持器開閉駆動機構３００Ａ（図４）を有している。この把持器開閉駆動機構３００Ａは、糸把持駆動カム３０７の正面カムによって作動するカムフォロア３０８がそれぞれ軸３０９にて軸着された下流側把持器駆動腕３１０および上流側把持器開放腕３１１を備えている。この下流側把持器駆動腕３１０および上流側把持器開放腕３１１は、糸供給ユニット基板５０１と糸供給ユニット前板５０２との間に挟持された把持器駆動軸受３１３に軸支される把持器駆動軸３１２の一端に固定され、この把持器駆動軸３１２の他端には下流側把持器開放腕３１４が固定されている。
【００２８】
このように構成された把持器開閉駆動機構３００Ａは、糸把持駆動カム３０７が回転することにより上流側把持器開放腕３１１が上流側把持軸４２の一端を、下流側把持器開放腕３１４が下流側把持器駆動腕３１０を介して下流側把持軸７２の一端をそれぞれ押し上げることができる（図５）。
【００２９】
また、糸供給装置は、縫目形成装置１００と同期して駆動され、布の布送り時に開成された第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０および閉成された第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０間に延びる糸道の各縫糸を縫目形成装置１００の１縫目に必要な縫糸量として偏倚し、縫目形成時に各縫糸を解放する一対の定型縫い振動子５０３、５０４を備えている。
【００３０】
この一対の定型縫い振動子５０３、５０４には、針糸やルーパ糸に対応した第１糸振動子５０３ａ、５０４ａ、第２糸振動子５０３ｂ、５０４ｂ、第３糸振動子５０３ｃ、５０４ｃ、第４糸振動子５０３ｄ、５０４ｄがそれぞれ形成されている。この第１糸振動子５０３ａ、５０４ａ、第２糸振動子５０３ｂ、５０４ｂ、第３糸振動子５０３ｃ、５０４ｃ、第４糸振動子５０３ｄ、５０４ｄには、それぞれ各縫糸を各挿入口Ｅから糸供給ユニット基板５０１および糸供給ユニット前板５０２に形成された各一対の糸案内Ｇ1、Ｇ2に整致する糸道点Ｓに導入する傾斜部ＳＳを有している。
【００３１】
このような一対の定型縫い振動子５０３、５０４は、第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０および第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０間に給糸方向に隔置して配設された糸供給ユニット基板５０１および糸供給ユニット前板５０２間に配置されている。具体的には図４、図７、図８に示すように、一対の定型縫い振動子５０３、５０４はスペーサ５０６を介して振動子駆動軸５０５の一方に形成された雄ねじ部およびナット５０７で連結され、この連結された一対の定型縫い振動子５０３、５０４は糸供給ユニット基板５０１および糸供給ユニット前板５０２間に固定された振動子支軸５０８Ａ、５０８Ｂによって振動可能に支持されている。また、振動子駆動軸５０５の他方にはカムフォロワ５２５が回動可能に固定され、このカムフォロワ５２５は糸供給ユニット基板５０１に穿設された穴５０１ｂから突出して、糸供給駆動軸３０４に固着された定型縫い振動子駆動カム３０６の溝３０６ａに係合している。この定型縫い振動子駆動カム３０６の溝３０６ａは、糸供給駆動軸３０４の回転により振動子駆動軸５０５を介して一対の定型縫い振動子５０３、５０４を振動させることができるように凹設されている。
【００３２】
また、糸供給装置は、布に縫目形成を行う縫幅、縫目送り量に応じ変化する１縫目に必要な各縫糸量に対応して糸道の一対の定型縫い振動子５０３、５０４によって偏倚される各偏倚量をそれぞれ調節する第１糸偏倚子５１４、第２糸偏倚子５３０、第３糸偏倚子５３１を有している。
【００３３】
第１糸偏倚子５１４、第２糸偏倚子５３０、第３糸偏倚子５３１は、一対の定型縫い振動子５０３、５０４間に配置されている。第１糸偏倚子５１４は、一対の定型縫い振動子５０３、５０４の第１糸振動子５０３ａ、５０４ａに対応する縫糸を導入するための糸溝５１４ｂ、第２糸振動子５０３ｂ、５０４ｂに対応する縫糸を導入するための糸溝５１４ｃが形成され、糸供給ユニット基板５０１および糸供給ユニット前板５０２間に固定された偏倚子支軸５１１および一方の振動子支軸５０８Ａによって、給糸方向に対して垂直な方向に移動可能に支持されている。また、第１糸偏倚子５１４の下端には孔５１４ａが穿設され、糸供給ユニット基板５０１に段ねじ５１９で軸着された縫目送り調節偏倚レバー５２０の一端に突設された第１糸偏倚子駆動軸５２０ａが挿入されている。この縫目送り調節偏倚レバー５２０にはばね掛け５２０ｂが突設され、このばね掛け５２０ｂと糸供給ユニット基板５０１に突設されたピン５０１ａとの間には引張ばね５１８が張設されている。また、縫目送り調節偏倚レバー５２０には、かしめ段ピン５１６にて連接リンク５１７の一端が軸着され、連接リンク５１７の他端はかしめ段ピン５１５にて偏倚調節板５１３に軸着されている。この偏倚調節板５１３は、偏倚子支軸５１１および一方の振動子支軸５０８Ａによって、給糸方向に対して垂直な方向に移動可能に支持されている。
【００３４】
これにより、縫目送り調節偏倚レバー５２０は糸供給ユニット前板５０２側から見て時計方向に常時回転弾撥されるので、第１糸偏倚子５１４および偏倚調節板５１３は右方向へ水平弾撥されることになる。
【００３５】
第２糸偏倚子５３０および第３糸偏倚子５３１は、一対の定型縫い振動子５０３、５０４の第３糸振動子５０３ｃ、５０４ｃに対応する糸を導入するための糸溝５３０ｄ、および第４糸振動子５０３ｄ、５０４ｄに対応する糸を導入するための糸溝５３１ｃがそれぞれ形成され、糸供給ユニット基板５０１および糸供給ユニット前板５０２間に固定された偏倚子支軸５２１および他方の振動子支軸５０８Ｂによって、給糸方向に対して垂直な方向に移動可能に支持されている。第２糸偏倚子５３０の一端には第１のばね掛け５３０ａが突設され、この第１のばね掛け５３０ａと糸供給ユニット前板５０２の一端に突設されたばね掛け５０２ａとの間には引張りばね５３３が張設されている。これにより、第２糸偏倚子５３０は、糸供給ユニット前板５０２側から見て右方向へ水平弾撥されることになる。また、第２糸偏倚子５３０の他端には第２のばね掛け５３０ｂが突設され、この第２のばね掛け５３０ｂと第３糸偏倚子５３１の一端に突設されたばね掛け５３１ａとの間には引張りばね５３２が張設されている。これにより、第３糸偏倚子５３１は糸供給ユニット前板５０２側から見て左方向へ水平弾撥されることになる。
【００３６】
また、糸供給装置は図２、図３、図４、図７に示すように、縫目形成装置１００と同期して駆動され、布の布送り時に開成された第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０および閉成された第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０間に延びる糸道の上ルーパ糸、下ルーパ糸の一方の縫糸量と他方の縫糸量の和が一定で、一方の縫糸量が増加するに伴い他方の縫糸量が減少して１縫目に必要な各縫糸の縫糸量を変化させるように偏倚し、縫目形成時に縫糸を解放する変形縫い振動子６０１を備えている。この変形縫い振動子６０１には、ルーパ糸に対応した第１糸繰り部６０１ａ、第２糸繰り部６０１ｂが形成されている。
【００３７】
このような変形縫い振動子６０１は、第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０および第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０間に給糸方向に隔置して配設された糸供給ユニット基板５０１および上流側糸供給ユニット板６３０間に配置されている。具体的には、上流側糸供給ユニット板６３０がスペーサ６３２を介して糸供給ユニット基板５０１に結合ねじ６３３で固定され、且つ変形縫い振動子６０１に穿孔されている長円孔６０１ｃ内に、中側に位置する２つのスペーサ６３２が遊嵌されると共に、変形縫い振動子６０１を挟むように配置されるがたつき防止用スペーサ６３４、６３５が中側に位置する２つのスペーサ６３２に支持されている。これにより、変形縫い振動子６０１は、給糸方向へのがたつきを防いだ状態で給糸方向に対して垂直な方向に振動可能に支持される。
【００３８】
さらに、糸供給装置は図４、図７、図８、図９に示すように、定型縫い振動子５０３、５０４および変形縫い振動子６０１を１縫目毎に所定の変速比をもって駆動する変速機構６００と、定型縫い振動子５０３、５０４および変形縫い振動子６０１を作動させるときは変速機構６００の駆動側から従動側へ伝達するクラッチ６５０とを有する縫目切換機構を備えている。
【００３９】
変速機構６００は、糸供給駆動軸３０４に挿嵌されると共に駆動歯車連結ピン６１６により定型縫い振動子駆動カム３０６に連結され止め輪６１５で当該糸供給駆動軸３０４上に固定される駆動歯車６１４と、一対の第１糸供給駆動軸受３０５Ａ、３０５Ａ’の下方に併設される一対の第２糸供給駆動軸受３０５Ｂ、３０５Ｂ’で軸支される変形縫い駆動カム軸６１３に挿嵌され駆動歯車６１４と噛合する従動歯車６０９とを有している。また、変形縫い駆動カム軸６１３には、変形縫い振動子駆動カム６０６が固着されると共に従動歯車連結ピン６０８により従動歯車６０９に連結されている。なお、この変形縫い振動子駆動カム６０６と従動歯車６０９との間に従動歯車押上げばね６０７が介在するように当該従動歯車押上げばね６０７が変形縫い振動子駆動カム６０６の端面に形成されたばね保持部６０６ｂに巻装されている。これにより、従動歯車６０９は、常時、変形縫い振動子駆動カム６０６から離れるように水平弾撥されることになる。
【００４０】
また、変形縫い振動子駆動カム６０６の溝６０６ａには、駆動歯車６１４と第１糸供給駆動軸受３０５Ａとの間に配置され糸供給駆動軸３０４に摺動可能に挿嵌された変形縫いスライダ６０２の下部にカムフォロア軸６０４により回動可能に固定されたカムフォロア６０５が係合している（図８）。この変形縫いスライダ６０２は、上部に上流側糸供給ユニット板６３０の下部に形成された変形縫いスライダ案内部６３０ａに摺動可能に係合する案内溝６０２ａが形成され、さらに側部に変形縫い振動子６０１が止めねじ６０３で固定されている。なお、変形縫い振動子駆動カム６０６の溝６０６ａは、従動歯車６０９のの回転により変形縫いスライダ６０２のカムフォロア６０５を介して変形縫い振動子６０１を振動させることができるように凹設されている。
【００４１】
このような変速機構６００は、歯車の変速比が駆動歯車６１４の歯数を２４、従動歯車６０９の歯数を２５に設定されているので、定型縫い振動子５０３、５０４の振動に対して変形縫い振動子６０１の振動は糸供給駆動軸３０４の１回転において２５分の１の遅れで駆動されるが、これに限らず、飾り縫いの縫形状に応じて他の速度比にしてもよい。
【００４２】
クラッチ６５０は、駆動歯車６１４と従動歯車６０９との噛み合いをかけたり外したりするもので、従動歯車６０９の側面に当接され変形縫い駆動カム軸６１３に移動可能に担持されるクラッチ切換レバー６１０と、クラッチ切換レバー６１０に固定されたクラッチ切換レバー軸６１１に回動可能に担持されることにより当該クラッチ切換レバー６１０に蝶着されるクラッチ切換受板６１２と、このクラッチ切換受板６１２およびクラッチ切換レバー６１０をクラッチ切換レバー軸６１１を中心にそれぞれ相反する回転方向へ弾撥するために当該クラッチ切換レバー軸６１１に巻装され一方の腕がクラッチ切換レバー６１０に他方の腕がクラッチ切換受板６１２に弾撥可能に圧接されるクラッチ切換ねじりコイルばね６２６と、クラッチ切換レバー６１０を常時、従動歯車６０９に圧接して当該従動歯車６０９を従動歯車押上げばね６０７の弾撥力に抗して変形縫い振動子駆動カム６０６方向に引き寄せて従動歯車６０９と駆動歯車６１４とを噛合させるために糸供給ユニット基板５０１に固着されたばね掛け６３６とクラッチ切換受け板６１２との間に張設されるクラッチ引張りばね６２７とから構成されている（図１０）。
【００４３】
なお、クラッチ切換レバー６１０は、定型縫い振動子５０３、５０４を作動させるときは変形縫い振動子６０１が偏倚しないように固定する固定部材６１０ａを上端部に有している。この変形縫い駆動カム軸６１３に移動可能に担持されるクラッチ切換レバー６１０の固定部材６１０ａは、クラッチ切換レバー６１０が変形縫い駆動カム軸６１３を中心にして所定回転方向へ回転すると、変形縫いスライダ６０２に形成された凸部６０２ｂの側面に落ち込むように形成されている。
【００４４】
また、定型縫い振動子５０３、５０４の作動と定型縫い振動子５０３、５０４および変形縫い振動子６０１の作動とを、このクラッチ６５０で切換える切換ツマミ６２２を有している。具体的には、糸供給ユニット基板５０１の下流側の第３下流側把持器８０、第４下流側把持器９０が固着される部位の下方に止めねじ６２３、６２４で固定される縫目切換ツマミ台６２０と、縫目切換ツマミ台６２０に給糸方向に対して垂直な方向で軸支され一端に切換ツマミ６２２が固定された切換ツマミ軸６２１と、縫目切換ツマミ台６２０に給糸方向に対して回動可能に軸着され切換ツマミ軸６２１の他端に切欠かれた変形縫いカム用切欠６２１ａおよび定型縫いカム用切欠６２１ｂに一端に形成された上部受部６１９ａが係合する縫目切換作動腕６１９と、糸供給ユニット基板５０１に給糸方向に対して摺動可能に軸支され縫目切換作動腕６１９の他端に形成された下部受部６１９ｂおよびクラッチ切換受板６１２に形成された受部６１２ａそれぞれに係合される縫目切換作動軸６１８と、縫目切換作動腕６１９の下部受部６１９ｂ側に位置する縫目切換作動軸６１８に形成されたストッパ溝に嵌合される止め輪６３８と糸供給ユニット基板５０１との間に配置され縫目切換作動軸６１８に巻装される圧縮ばね６１７とを有している（図９）。
【００４５】
このように構成された飾り縫いミシンの糸供給装置は図１に示すように、さらに、定型縫いにおいて巻ロック縫い時には１縫目に必要な上ルーパ糸および下ルーパ糸の偏倚量を実質的に同量になるように、変形巻ロック縫い時には１縫目に必要な上ルーパ糸の偏倚量を増量し、下ルーパ糸の偏倚量を減量するように第２糸偏倚子５３０および第３糸偏倚子５３１（図２、図７）を変移させる切換手段である縫目切換手段５００を備えている。
【００４６】
縫目切換手段５００は、縫目選択ダイヤル５６０を回転させて縫目切換カム板５５０を水平移動させることにより巻ロック縫い、変形巻ロック縫い、１本針オーバロック縫いおよび２本針オーバロック縫いに切換えることができる。なお、この縫目切換手段５００は公知技術（特開平１０−２７２２７３号公報掲載）なので詳しい説明は省略する。
【００４７】
また、この糸供給装置は、第２糸偏倚子５３０および第３糸偏倚子５３１（図２、図７）を縫幅調節部８００の縫幅調節ダイヤル８０２の操作に応じ変化する１縫目に必要な縫糸量に対応して連動させて駆動するために糸調子微調整手段４００を有している。この糸調子微調整手段４００は縫幅調節部８００と第２糸偏倚子５３０に突設されたワイヤ掛け５３０ｅ（図７）とを縫幅調節連動ワイヤ４１０で連結し、また、縫目送り調節部９００と縫目送り調節偏倚レバー５２０のワイヤ掛け５２０ｃ（図１、図７）とを縫目送り調節連動ワイヤ４２０で連結するものである。なお、この糸調子微調整手段４００も公知技術（特開平１０−２７２２７３号公報掲載）なので詳しい説明は省略する。
【００４８】
以上のような構成における飾り縫いミシンの糸供給装置の動作について説明する。なお、動作説明において、方向性を示す場合はミシンを縫製作業者側から見たものとする。
【００４９】
まず、変形縫い（飾り縫い）を行う場合について説明する。切換ツマミ６２２で変形縫いを選択するために回転操作して、切換ツマミ軸６２１の変形縫いカム用切欠６２１ａと縫目切換作動腕６１９の上部受部６１９ａとを係合させると、縫目切換作動腕６１９の下端受部６１９ｂは、縫目切換作動軸６１８が圧縮ばね６１７の弾撥力により縫目切換作動腕６１９の下端受部６１９ｂ側に移動できるように後退する。縫目切換作動軸６１８が縫目切換作動腕６１９の下端受部６１９ｂ側に移動すると、クラッチ切換レバー６１０に蝶着されるクラッチ切換受板６１２の受部６１２ａは、クラッチ切換ねじりコイルばね６２６の弾撥力によって切換ツマミ６２２側から見て時計方向へと回転する。これと同時にクラッチ切換レバー６１０もクラッチ切換ねじりコイルばね６２６の弾撥力によって切換ツマミ６２２側から見て時計方向へと回転するので、後述する定型縫いのために変形縫いスライダ６０２の凸部６０２ｂの側面に落ち込んでいるクラッチ切換レバー６１０の固定部材６１０ａが離脱する。
【００５０】
このクラッチ切換レバー６１０の固定部材６１０ａが変形縫いスライダ６０２の凸部６０２ｂの側面から離脱すると、クラッチ切換レバー６１０は、変形縫い駆動カム軸６１３の軸方向において移動自由になることから、クラッチ引張ばね６２７の弾撥力によって従動歯車押上げばね６０７の弾撥力に抗して変形縫い振動子駆動カム６０６側へと移動するので、従動歯車６０９も変形縫い振動子駆動カム６０６側へと移動する。これにより、従動歯車６０９と駆動歯車６１４とは噛合されクラッチ６５０が連結された状態になるので、定型縫い振動子駆動カム３０６の回転を変形縫い振動子駆動カム６０６へと伝達することができるようになる（図９、図１０）。
【００５１】
このようにして切換ツマミ６２２で変形縫いを選択後、図１１に示すように、針糸３１を第１上流側把持器４０の一対の把持皿４４間、上流側糸供給ユニット板６３０の第１上流側把持器４０に対応した糸案内Ｇ、糸供給ユニット基板５０１の第１上流側把持器４０に対応した糸案内Ｇ1、定型縫い振動子５０３の第１上流側把持器４０に対応した第１糸振動子５０３ａの挿入口Ｅ、第１糸偏倚子５１４の挿入口５１４ｂ、定型縫い振動子５０４の第１上流側把持器４０に対応した第１糸振動子５０４ａの挿入口Ｅ、糸供給ユニット前板５０２の第１上流側把持器４０に対応した糸案内Ｇ2および第１上流側把持器４０に対応した第１下流側把持器７０の一対の把持皿４４間に挿入する。また、上ルーパ糸３３を第２上流側把持器４１の一対の把持皿４４間、上流側糸供給ユニット板６３０の第２上流側把持器４１に対応した糸案内Ｇ、糸供給ユニット基板５０１の第２上流側把持器４１に対応した糸案内Ｇ1、定型縫い振動子５０３の第２上流側把持器４１に対応した第１糸振動子５０３ｂの挿入口Ｅ、第１糸偏倚子５１４の挿入口５１４ｃ、定型縫い振動子５０４の第２上流側把持器４１に対応した第１糸振動子５０４ｂの挿入口Ｅ、糸供給ユニット前板５０２の第２上流側把持器４１に対応した糸案内Ｇ2および第２上流側把持器４１に対応した第２下流側把持器７１の一対の把持皿４４間に挿入する。さらに、下ルーパ糸３４を第４上流側把持器６０の一対の把持皿４４間、上流側糸供給ユニット板６３０の第４上流側把持器６０に対応した糸案内Ｇ、糸供給ユニット基板５０１の第４上流側把持器６０に対応した糸案内Ｇ１、定型縫い振動子５０３の第４上流側把持器６０に対応した第４糸振動子５０３ｄの挿入口Ｅ、第３糸偏倚子５３１の挿入口５３１ｃ、定型縫い振動子５０４の第４上流側把持器６０に対応した第４糸振動子５０４ｄの挿入口Ｅ、糸供給ユニット前板５０２の第４上流側把持器６０に対応した糸案内Ｇ２および第４上流側把持器６０に対応した第４下流側把持器９０の一対の把持皿４４間に挿入する。
【００５２】
挿入後、針糸３１は糸案内、針糸天秤を経て右縫針９Ｂの針穴に、上ルーパ糸３３および下ルーパ糸３４は加圧気体を利用して自動的に糸を通すための糸通し器３５を経て上ルーパ２７、下ルーパ２１の糸口にそれぞれ通す。
【００５３】
このように糸通しが終了した後、縫い動作を開始すると駆動軸３が回転し、その一回転において針駆動腕６は一往復の揺動運動を行うので、右縫針９Ｂは一往復の上下運動を行う。この際、駆動軸３に固着された糸供給駆動部プーリ３０１は、タイミングベルト３０３、糸供給駆動軸プーリ３０２および糸供給駆動軸３０４を介して糸把持駆動カム３０７を一回転させる。この糸把持駆動カム３０７が一回転する間に、上流側把持器開放腕３１１および下流側把持器開放腕３１２が糸把持駆動カム３０７の正面カムによって交互に揺動運動を行う。これにより、上流側把持軸４２および下流側把持軸７２は上流側把持器開放腕３１１および下流側把持器開放腕３１２によって、右方に交互に移動しながら往復運動するので、第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０を縫目形成時に閉成させ、布送り時に開成させ、第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０を縫目形成時に開成させ、布送り時に閉成させることができる。
【００５４】
このような把持器の各糸を開成、閉成する動作と同時に、駆動軸３の一回転において駆動軸３に固定された定型縫い振動子駆動カム３０６の溝３０６ａに嵌合するカムフォロワ５２５と連動する定型縫い振動子５０３、５０４は、一往復運動を行う。この際、針糸３１、上ルーパ糸３３、下ルーパ糸３４はそれぞれ定型縫い振動子５０３、５０４の各傾斜部ＳＳにより、糸供給ユニット基板５０１および糸供給ユニット前板５０２に形成された各一対の糸案内Ｇ１、Ｇ２に整致する糸道点Ｓに導入される。この定型縫い振動子５０３、５０４の往復運動により針糸３１、上ルーパ糸３３、下ルーパ糸３４は、縫目形成装置１００の１縫目に必要な縫糸量として偏倚・開放される。
【００５５】
このように定型縫い振動子５０３、５０４で１縫目に必要な縫糸量として偏倚・開放される上ルーパ糸３３、下ルーパ糸３４は、さらに、変形縫い振動子６０１によって縫糸量が加減算され、上ルーパ糸３３の、下ルーパ糸３４の和が一定で、一方の縫糸量が増加するに伴い他方の縫糸量が減少して１縫目に必要な各縫糸の縫糸量を一定周期で変化させる。即ち、駆動軸３の回転運動は、糸供給駆動軸３０４を介して定型縫い振動子５０３、５０４を振動させる定型縫い振動子駆動カム３０６の側端に駆動歯車連結ピン６１６で連結固着された駆動歯車６１４から２４対２５で噛合する従動歯車６０９を介して変形縫い振動子６０１を振動させる変形縫い振動子駆動カム６０６へ減速伝達される。これにより、定型縫い振動子５０３、５０４の振動に対して変形縫い振動子６０１の振動は駆動軸３（糸供給駆動軸プーリ３０２）の１回転に対して２５分の１ずつ遅れて振動し、定型縫い振動子５０３、５０４の振動と変形縫い振動子６０１の振動とは同相の振動から徐々に逆相の振動となり２５回転で元の同相の振動に戻るサイクルを繰り返すことになる。
【００５６】
その間、生じるタイミング差によって定型縫い振動子５０３、５０４による偏倚・解放と変形縫い振動子６０１の糸繰り部６０１ａ、６０１ｂによる偏倚・解放・吸収との加減された縫糸量を変化させて一方の縫糸量と他方の縫糸量の和が一定で、一方の縫糸量が増加するに伴い他方の縫糸量が減少して１縫目こ必要な各縫糸の縫糸量を一定周期で変化させ上ルーパ糸３３および下ルーパ糸３４の縫目結節点の位置を波形状に変化させる変形縫いの波形縁かがり縫いを行うことができる。
【００５７】
この変形縫いにおける上ルーパ糸３３と下ルーパ糸３４の縫糸量の偏倚・解放について詳述すると、図１１（ａ）、（ｂ）に示すように、右縫針９Ｂが上昇して布送り時に上流側把持器４０、４１、５０、６０が開成して下流側把持器７０、７１、８０、９０が閉成しているタイミングにおいて、定型縫い振動子５０３、５０４と変形縫い振動子６０１が同相で偏倚する時点で変形縫い振動子６０１の糸繰り部６０１ｂが偏倚する位置にあるので、下ルーパ糸３４は定型縫い振動子５０３、５０４の偏倚する縫糸量に変形縫い振動子６０１の糸繰り部６０１ｂによって偏倚する縫糸量を加算して最大量を蓄糸することになる（図１１（ａ））。
【００５８】
その時、変形縫い振動子６０１の糸繰り部６０１ａは、上ルーパ糸３３を偏倚しないで解放する位置にあって蓄糸せず定型縫い振動子５０３、５０４の偏倚する縫糸量のみを蓄糸する（図１１（ａ））。
【００５９】
続いて右縫針９Ｂが上死点より降下し縫目形成時に上流側把持器４０、４１、５０、６０が閉成して下流側把持器７０、７１、８０、９０が開成すると、下ルーバ糸３４は定型縫い振動子５０３、５０４の偏倚した縫糸量と変形縫い振動子６０１の糸繰り部６０１ｂによって偏倚した縫糸量とが同時に解放される。一方、上ルーパ糸３３は定型縫い振動子５０３、５０４の偏倚した縫糸量が解放されると同時に変形縫い振動子６０１の糸繰り部６０１ａが偏倚して定型縫い振動子５０３、５０４の解放する縫糸量が吸収される（図１１（ｂ））。即ち、定型縫い振動子５０３、５０４の偏倚した縫糸量を変形縫い振動子６０１の糸繰り部６０１ａの偏倚する縫糸量で差し引いた縫糸量のみ供給されることになる。
【００６０】
その結果、下ルーパ糸３４は変形縫い振動子６０１の糸繰り部６０１ｂが偏倚した縫糸量分が余り、上ルーパ糸３３は変形縫い振動子６０１の糸繰り部６０１ａが偏倚する縫糸量が不足して上下ルーパ糸のバランスが変化し上下ルーパ糸の縫目結節点は縫糸量の不足した上ルーバ糸３３に余った下ルーパ糸３４が引かれて布縁位置より針落ち位置側に移動した位置に結束することになる。
【００６１】
また、定型縫い振動子５０３、５０４と変形縫い振動子６０１とが逆相で偏倚する時点では、図１２（ａ）、（ｂ）に示すように、右縫針９Ｂが上昇して布送り時に上流側把持器４０、４１、５０、６０が開成して下流側把持器７０、７１、８０、９０が閉成するタイミングにおいて、変形縫い振動子６０１の糸繰り部６０１ａは上ルーパ糸３３を偏倚する位置にあって、上ルーパ糸３３は定型縫い振動子５０３、５０４が偏倚する縫糸量に変形縫い振動子６０１の糸繰り部６０１ａが偏倚する縫糸量を加算した最大量を蓄糸される（図１２（ａ））。
【００６２】
その時、変形縫い振動子６０１の糸繰り部６０１ｂは下ルーパ糸３４を解放して偏倚しない位置にあって下ルーパ糸３４は定型縫い振動子５０３、５０４の偏倚する縫糸量のみを蓄糸される（図１２（ａ））。
【００６３】
続いて右縫針９Ｂが上死点より降下して縫目形成時に上流側把持器４０、４１、５０、６０が閉成して下流側把持器７０、７１、８０、９０が開成すると、上ルーバ糸３３は定型縫い振動子５０３、５０４の偏倚した縫糸量と変形縫い振動子６０１の糸繰り部６０１ａによって偏倚された縫糸量とが同時に解放される。一方、下ルーバ糸３４は定型縫い振動子５０３、５０４の偏倚した縫糸量が解放されると同時に変形縫い振動子６０１の糸繰り部６０１ｂが偏倚して定型縫い振動子５０３、５０４の解放する縫糸量が吸収される。即ち、定型縫い振動子５０３、５０４の偏倚した縫糸量を変形縫い振動子６０１の糸繰り部６０１ｂの偏倚する縫糸量で差し引いた縫糸量のみ供給されることになる（図１２（ｂ））。
【００６４】
その結果、上ルーパ糸３３は変形縫い振動子６０１の糸繰り部６０１ａが偏倚した縫糸量分が余り、下ルーパ糸３４は変形縫い振動子６０１の糸繰り部６０１ｂが偏倚する縫糸量が不足して上下ルーパ糸のバランスが変化し上下ルーパ糸の縫目結節点は縫糸量の不足した下ルーパ糸３４に余った上ルーパ糸３３が引かれて針落ち位置より布縁側に移動した位置に結束することになる。
【００６５】
このように、定型縫い振動子５０３、５０４の振動に対して変形縫い振動子６０１の振動を駆動軸３（糸供給駆動軸プーリ３０２）の１回転に対して２５分の１ずつ遅れて振動させ、定型縫い振動子５０３、５０４の振動と変形縫い振動子６０１の振動とを同相の振動から徐々に逆相の振動にして２５回転で元の同相の振動に戻る、即ち、２５針縫って元の縫目結節点位置に戻るサイクルを繰り返すことにより、図１３に示すように、上ルーパ糸３３および下ルーパ糸３４の縫目結節点の位置を波形状に変化させることができるので、変形縫いの波形縁かがり縫いを行うことができる。
【００６６】
なお、このような図１３に示す上ルーパ糸３３及び下ルーパ糸３４の縫目結節点の位置を布上面の針落ちと布縁間で波形状に変化させる変形縫いの波形縁かがり縫いの縫目の場合には、変形縫い振動子６０１の偏倚量は、変形縫い振動子６０１の糸繰り部６０１ａの偏倚する上ルーパ糸３３の偏倚量と、変形縫い振動子６０１の糸繰り部６０１ｂの偏倚する下ルーパ糸３４の偏倚量の和が、２（Ｗ＋ｔ／２）となるように設定される。ここで、Ｗはかがり幅、ｔは布厚さとする。
【００６７】
また、図１４に示すように、上ルーパ糸３３及び下ルーパ糸３４の縫目結節点の位置を布上面の針落ちから布縁を超え布下面の針落ち位置までの間で波形状に変化させる変形縫いの波形縁かがり縫いの縫目の場合には、変形縫い振動子６０１の偏倚量は、変形縫い振動子６０１の糸繰り部６０１ａの偏倚する上ルーパ糸３３の偏倚量と、変形縫い振動子６０１の糸繰り部６０１ｂの偏倚する下ルーパ糸３４の偏倚量の和が、２（２Ｗ＋ｔ）となるように設定される。
【００６８】
次に、定型縫いである１本針オーバロック縫いを行う場合について説明する。切換ツマミ６２２で１本針オーバロック縫いを選択するために回転操作して、切換ツマミ軸６２１の定型縫いカム用切欠６２１ｂと縫目切換作動腕６１９の上部受部６１９ａとを係合させると、縫目切換作動腕６１９の下端受部６１９ｂは、縫目切換作動軸６１８が圧縮ばね６１７の弾撥力に抗してクラッチ切換受板６１２の受部６１２ａ側に移動できるように前進する。縫目切換作動軸６１８がクラッチ切換受板６１２の受部６１２ａ側に移動すると、クラッチ切換レバー６１０に蝶着されるクラッチ切換受板６１２の受部６１２ａは、クラッチ切換ねじりコイルばね６２６の弾撥力に抗して切換ツマミ６２２側から見て反時計方向へと回転するが、下流側糸供給ユニット板５０２側から見て変形縫いスライダ６０２が右方向に移動している場合には、クラッチ切換レバー６１０の固定部材６１０ａが変形スライダ６０２の凸部６０２ｂの上面に衝突して、その回転は阻止される（図９、図１０）。
【００６９】
このような状態において、駆動軸３を回転させて定型縫い振動子駆動カム３０６に固着される駆動歯車６１４を回転させると、この駆動歯車６１４に噛合する従動歯車６０９を介して変形縫い振動子駆動カム６０６が回転するので、この変形縫い振動子駆動カム６０６の溝６０６ａに係合するカムフォロア６０５を介して下流側糸供給ユニット板５０２側から見て移動最右位置に停止する変形縫いスライダ６０２が左方向へと移動すると、クラッチ切換レバー６１０の固定部材６１０ａが変形スライダ６０２の凸部６０２ｂの上面から外れて側面に落ち込むことになる。即ち、下流側糸供給ユニット板５０２側から見て変形縫いスライダ６０２が左方向に移動している場合には、クラッチ切換レバー６１０の固定部材６１０ａは変形スライダ６０２の凸部６０２ｂの上面に衝突することなく側面に落ち込むことになる（図１５）。
【００７０】
このようにして、クラッチ切換レバー６１０の固定部材６１０ａが変形縫いスライダ６０２の凸部６０２ｂの側面に落ち込んだ後、下流側糸供給ユニット板５０２側から見て最左位置まで移動した変形縫いスライダ６０２がその最左位置から右方向に移動すると、変形スライダ６０２の凸部６０２ｂの側面がクラッチ切換レバー６１０の固定部材６１０ａの端面を押圧してクラッチ切換レバー６１０がクラッチ引張ばね６２７の弾撥力に抗して右方向に移動されるので、このクラッチ切換レバー６１０ｂによって駆動歯車６１４に噛合していた従動歯車６０９は、従動歯車押上げばね６０７の弾撥力により駆動歯車６１４から外れてクラッチ６５０が解離された状態になる（図１５）。この時点で変形縫いスライダ６０２は下流側糸供給ユニット板５０２側から見て最右位置で停止するので、変形縫い振動子６０１は以後、駆動軸３が回転しても振動しなくなる。なお、駆動歯車６１４から外れた従動歯車６０９は、糸供給ユニット基板５０１の所定位置に固定された歯車止め６３７によって回転運動が規制される。
【００７１】
このようにして切換ツマミ６２２で１本針オーバロック縫いを選択後、図１６（ｂ）に示すように、針糸３２、上ルーパ糸３３、下ルーパ糸３４をそれぞれ第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０の各一対の把持皿４４間、上流側糸供給ユニット板６３０の各縫糸に対応した糸案内Ｇ、糸供給ユニット基板５０１の各縫糸に対応した糸案内Ｇ1、振動子５０３の各挿入口Ｅ、第１糸偏倚子５１４の挿入口５１４ｃ、第２糸偏倚子５３０の挿入口５３０ｄ、第３糸偏倚子５３１の挿入口５３１ｃ、振動子５０４の各挿入口Ｅ、糸供給ユニット前板５０２の各縫糸に対応した糸案内Ｇ2および第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０の各一対の把持皿４４間にそれぞれ挿入する。挿入後、針糸３２は糸案内、針糸天秤を経て右縫針９Ｂの針穴に、上ルーパ糸３３および下ルーパ糸３４は加圧気体を利用して自動的に糸を通すための糸通し器３５を経て上ルーパ２７、下ルーパ２１の糸口にそれぞれ通す。
【００７２】
このように糸通しが終了した後、縫い動作を開始すると駆動軸３が回転し、変形縫いのときと同様に、上流側把持器開放腕３１１および下流側把持器開放腕３１２が糸把持駆動カム３０７の正面カムによって交互に揺動運動を行う。これにより、上流側把持軸４２および下流側把持軸７２は上流側把持器開放腕３１１および下流側把持器開放腕３１２によって、右方に交互に移動しながら往復運動するので、第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０を縫目形成時に閉成させ、布送り時に開成させ、第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０を縫目形成時に開成させ、布送り時に閉成させることができる。
【００７３】
このような把持器の各糸を開成、閉成する動作と同時に、駆動軸３の一回転において駆動軸３に固定された定型縫い振動子駆動カム３０６の溝３０６ａに嵌合するカムフォロワ５２５と連動する振動子５０３、５０４は、一往復運動を行う。この際、針糸３２、上ルーパ糸３３、下ルーパ糸３４はそれぞれ振動子５０３、５０４の各傾斜部ＳＳにより、糸供給ユニット基板５０１および糸供給ユニット前板５０２に形成された各一対の糸案内Ｇ１、Ｇ２に整致する糸道点Ｓに導入される。この振動子５０３、５０４の往復運動により針糸３２、上ルーパ糸３３、下ルーパ糸３４は、縫目形成装置１００の１縫目に必要な縫糸量として偏倚・開放される。
【００７４】
なお、定型縫いである１本針オーバロック縫い、２本針オーバロック縫い、巻ロック縫い、変形巻ロック縫いをそれぞれ選択したい場合には、縫目切換手段５００の縫目選択ダイヤル５６０を回転させることにより切換えることができる。
【００７５】
例えば、２本針オーバロック縫いを縫目選択ダイヤル５６０で選択すると、ミシン正面から見て縫目切換カム板５５０が最も左方へ位置すると共に縫幅調節連動ワイヤ４１０が引き上げられ、この縫幅調節連動ワイヤ４１０が引っ掛けられた第２糸偏倚子５３０を左方へ変移する。この際、第３糸偏倚子５３１も引張ばね５３２の引張力により左方へ変移する。これにより、第２糸偏倚子５３０および第３糸偏倚子５３１と、第３糸振動子５０３ｃ、５０４ｃおよび第４糸振動子５０３ｄ、５０４ｄとは図１６（ａ）に示すように、左縫針９Ａ、右縫針９Ｂが上死点に位置する場合において、上ルーパ糸３３および下ルーパ糸３４の偏倚量が最も多くなるような位置関係になる。これは図１７に示すように、後述する１本針オーバロック縫い、巻ロック縫い、変形巻ロック縫いに比べて針幅ＷL分だけ上ルーパ糸３３および下ルーパ糸３４の縫幅Ｗが増えるからである。
【００７６】
なお、２本針オーバロック縫いにおいては図１６（ａ）に示すように、、左針糸３１、右針糸３２、上ルーパ糸３３、下ルーパ糸３４をそれぞれ第１上流側把持器４０、第２上流側把持器４１、第３上流側把持器５０、第４上流側把持器６０の各一対の把持皿４４間、上流側糸供給ユニット板６３０の各縫糸に対応した糸案内Ｇ、糸供給ユニット基板５０１の各縫糸に対応した糸案内Ｇ1、振動子５０３の各挿入口Ｅ、第１糸偏倚子５１４の各挿入口５１４ｂ、５１４ｃ、第２糸偏倚子５３０の挿入口５３０ｄ、第３糸偏倚子５３１の挿入口５３１ｃ、振動子５０４の各挿入口Ｅ、糸供給ユニット前板５０２の各縫糸に対応した糸案内Ｇ2および第１下流側把持器７０、第２下流側把持器７１、第３下流側把持器８０、第４下流側把持器９０の各一対の把持皿４４間にそれぞれ挿入する。挿入後、左針糸３１、右針糸３２はそれぞれ糸案内、針糸天秤を経て左縫針９Ａ、右縫針９Ｂの針穴に、上ルーパ糸３３および下ルーパ糸３４は加圧気体を利用して自動的に糸を通すための糸通し器３５を経て上ルーパ２７、下ルーパ２１の糸口にそれぞれ通すことになる。
【００７７】
また、１本針オーバロック縫いを縫目選択ダイヤル５６０で選択すると、ミシン正面から見て縫目切換カム板５５０が２本針オーバロック縫いよりも右方へ移動すると共に縫幅調節連動ワイヤ４１０が下がり、この縫幅調節連動ワイヤ４１０が引っ掛けられた第２糸偏倚子５３０は引張ばね５３３の引張力により右方へ変移する。この際、第３糸偏倚子５３１も引張ばね５３２の引張力により右方へ変移する。これにより、第２糸偏倚子５３０および第３糸偏倚子５３１と、第３糸振動子５０３ｃ、５０４ｃおよび第４糸振動子５０３ｄ、５０４ｄとは図１６（ｂ）に示すように、右縫針９Ｂが上死点に位置する場合において、上ルーパ糸３３および下ルーパ糸３４の偏倚量が２本針オーバロック縫いに比べて減量するような位置関係になる。これは図１８に示すように、２本針オーバロック縫いに比べて針幅ＷL分だけ上ルーパ糸３３および下ルーパ糸３４の縫幅Ｗが減るからである。
【００７８】
また、巻ロック縫いを縫目選択ダイヤル５６０で選択すると、縫目切換カム板５５０が１本針オーバロック縫いよりも右方へ移動すると共に縫幅調節連動ワイヤ４１０が下がり、この縫幅調節連動ワイヤ４１０が引っ掛けられた第２糸偏倚子５３０は引張ばね５３３の引張力により右方へ変移する。この際、第３糸偏倚子５３１も引張ばね５３２の引張力により右方へ変移する。これにより、第２糸偏倚子５３０および第３糸偏倚子５３１と、第３糸振動子５０３ｃ、５０４ｃおよび第４糸振動子５０３ｄ、５０４ｄとは図１６（ｃ）に示すように、右縫針９Ｂが上死点に位置する場合において、上ルーパ糸３３および下ルーパ糸３４の偏倚量が１本針オーバロック縫いに比べて減量するような位置関係になる。これは図１９に示すように布を巻き込むので、１本針オーバロック縫いに比べて上ルーパ糸３３および下ルーパ糸３４の縫幅Ｗが減るからである。
【００７９】
なお、巻ロック縫いにおける糸通しは１本針オーバロック縫いと同様に行う。
【００８０】
さらに、変形巻ロック縫いを縫目選択ダイヤル５６０で選択すると、縫目切換カム板５５０が巻ロック縫いよりも右方へ移動すると共に縫幅調節連動ワイヤ４１０が引き上げられ、この縫幅調節連動ワイヤ４１０が引っ掛けられた第２糸偏倚子５３０は１本針オーバロックと同じ位置へ変移する。この際、第２糸偏倚子５３０の挿入口５３０ｄと第３糸偏倚子５３１の挿入口５３１ｃとは離間される。これにより、第２糸偏倚子５３０と第３糸振動子５０３ｃ、５０４ｃとは図１６（ｄ）に示すように、右縫針９Ｂが上死点に位置する場合において、上ルーパ糸３３の偏倚量が巻ロック縫いに比べて増量するような位置関係になる。また、第３糸偏倚子５３１と第４糸振動子５０３ｄ、５０４ｄとは右縫針９Ｂが上死点に位置する場合において、下ルーパ糸３４の偏倚量が巻ロック縫いに比べて減量するような位置関係になる。これは図２０に示すように、１縫目に必要な上ルーパ糸３３が布の縫幅Ｗの表裏を包み込み、下ルーパ糸３４が布の裏面で上ルーパ糸３３に直結されるからである。
【００８１】
なお、変形巻ロック縫いにおける糸通しは１本針オーバロック縫いと同様に行う。
【００８２】
このような本実施の一形態である糸供給装置の具体的な糸供給動作を、１本針オーバロック縫いにおける第３上流側把持器５０、第３下流側把持器８０、第３糸振動子５０３ｃ、５０４ｃ、第２糸偏倚子５３０によって説明する。
【００８３】
布送り時は図５（ｂ）に示すように、上流側把持軸４２が上流側把持器開放腕３１１によって押圧されるので、第３上流側把持器５０の一対の把持皿４４に対する圧縮ばね４６からの弾撥力がスラスト受４７およびばね受４５の右方への移動により弱くなり、第３上流側把持器５０は開成される。また、このときには下流側把持軸７２が下流側把持器開放腕３１４によって押圧されないので、圧縮ばね４６の弾撥力がばね受４５を介して一対の把持皿４４に付与される。これにより、第３下流側把持器８０は閉成される。この際、第３糸振動子５０３ｃ、５０４ｃが、上ルーパ糸３２を蓄糸しながら右方へ移動する。したがって、縫目形成装置１００の１縫目に必要な縫糸量として偏倚することができる。
【００８４】
また縫目形成時は図５（ａ）に示すように、上流側把持軸４２が上流側把持器開放腕３１１によって押圧されないので、第３上流側把持器５０の圧縮ばね４６の弾撥力がばね受４５を介して一対の把持皿４４に付与される。これにより、第３上流側把持器５０は閉成される。また、このときには、下流側把持軸７２が下流側把持器開放腕３１４によって押圧されるので、第３上流側把持器８０の一対の把持皿４４に対する圧縮ばね４６からの弾撥力がスラスト受４７およびばね受４５の右方への移動により弱くなり、第３上流側把持器８０は開成される。この際、第３糸振動子５０３ｃ、５０４ｃが、左方へ移動することから、縫目形成装置１００の１縫目に必要な縫糸量として開放することができる。
【００８５】
なお、第２上流側把持器４１、第２糸振動子５０３ｂ、５０４ｂ、第１糸偏倚子５１４、第２下流側把持器７１と、第４上流側把持器６０、第４糸振動子５０３ｄ、５０４ｄ、第３糸偏倚子５３１、第４下流側把持器９０とにおいても、同様の糸供給動作をするのは言うまでもない。
【００８６】
このような糸供給装置において、布に縫目形成を行なうときの縫幅を変更して糸の縫糸量を調整する場合には、縫幅調節ダイヤル８０２を回して、糸調子微調整手段４００の縫幅調節連動ワイヤ４１０を介して第２糸偏倚子５３０および第３糸偏倚子５３１を変移させる。即ち、縫幅調節ダイヤル８０２が縫幅が広くなるように設定されているときには、縫幅調節連動ワイヤ４１０が引張られるので、第２糸偏倚子５３０および第３糸偏倚子５３１は左方に変移する。これにより、第３糸振動子５０３ｃ、５０４ｃおよび第４糸振動子５０３ｄ、５０４ｄによる上ルーパ糸３３および下ルーパ糸３４の偏倚量を増量することができるので、図１３、図１４、図１７、図１８、図１９、図２０に示す縫幅Ｗが広いときの縫糸量分を増量できる。
【００８７】
また、縫幅調節ダイヤル８０２が縫幅が狭くなるように設定されているときには、縫幅調節連動ワイヤ４１０が弛緩されるので、第２糸偏倚子５３０および第３糸偏倚子５３１は引張ばね５３３によって引張られ右方に変移する。これにより、第３糸振動子５０３ｃ、５０４ｃおよび第４糸振動子５０３ｄ、５０４ｄによる上ルーパ糸３３および下ルーパ糸３４の偏倚量を減量することができるので、図１３、図１４、図１７、図１８、図１９、図２０に示す縫幅Ｗが狭いときの縫糸量分を減量できる。
【００８８】
また、布に縫目形成を行なうときの縫目送り量の変更に対応して糸の縫糸量を調整する場合には、送り目調節ダイヤル９３０を回して糸調子微調整手段４００の縫目送り調節連動ワイヤ４２０を介して縫目送り調節偏倚レバー５２０を回転させる。これにより、縫目送り調節偏倚レバー５２０の第１糸偏倚子駆動軸５２０ａに係合している第１糸偏倚子５１４が変移する。同時に、縫目送り調節偏倚レバー５２０に連接リンク５１７を介して連結されている偏倚調節板５１３が変移することから、この偏倚調節板５１３に連結されている縫幅調節連動ワイヤ４１０を介して第２糸偏倚子５３０および第３糸偏倚子５３１が変移する。
【００８９】
したがって、縫目送りピッチＰを変えるために送り目調節ダイヤル９３０を回すと、第１糸偏倚子５１４を、糸調子微調整手段４００を介して縫目送り調節部９００に連動させることができるので、送り目調節ダイヤル９３０の操作に応じ変化する１縫目に必要な縫糸量に対応させることができる。この際、縫目送りピッチＰが変化すると、針糸３２（針糸３１）だけではなく上ルーパ糸３３および下ルーパ糸３４の縫糸量も若干変わることになるので、第２糸偏倚子５３０および第３糸偏倚子５３０も糸調子微調整手段４００を介して縫目送り調節部９００に連動することになる。
【００９０】
なお、糸供給装置は、第１糸偏倚子５１４、ルーパ糸偏倚子５３０および第３糸偏倚子５３１を布押え１０５０による布厚に応じて変化する１縫目に必要な縫糸量に対応して連動させて駆動するために、特開平１０−２７２２７３号公報に開示されている布厚調節連動手段を設けてもよい。なお、この布厚調節連動手段は公知技術なので詳しい説明は省略する。
【００９１】
また、本実施の一形態においてはルーパは一対のルーパを備えたミシンで説明したが、これに限らず、二対以上のルーパを備えたミシンにおいても同様の作用・効果を得ることができる。
【００９２】
また、本実施の一形態においては一対の振動子５０３、５０４に対して、第１糸振動子５０３ａ、５０４ａ、第２糸振動子５０３ｂ、５０４ｂ、第３糸振動子５０３ｃ、５０４ｃ、下ルーパ振動子５０３ｄ、５０４ｄをそれぞれ形成させていたが、これに限らず、これら各振動子を個別に設けてもよい。
【００９３】
【発明の効果】
以上、説明したように、本発明の飾り縫いミシンの糸供給装置によれば、縫糸の種類、縫糸の太さ、布厚、縫幅などに応じてマニュアル操作で補正調整することなく、複数本の縫糸をその縫目結節点の位置が変化するように１縫目に必要な縫糸量として供給することができる。また、糸調子器の制御により糸張力を設定するような装置の構成ではないので、機構が簡素化され製造の精度を確保でき、而も耐久性も向上し、高速縫製に対応できるようにして、複数本の縫糸をその縫目結節点の位置が変化するように１縫目に必要な縫糸量として供給することができる。
【図面の簡単な説明】
【図１】本発明の飾り縫いミシンの糸供給装置が適用される飾り縫いミシンを示す全体斜視図。
【図２】本発明の飾り縫いミシンの糸供給装置を示す斜視図。
【図３】本発明の飾り縫いミシンの糸供給装置を示す斜視図。
【図４】本発明の飾り縫いミシンの糸供給装置の上流側把持器、糸供給駆動部、変形縫い振動子、変速機構およびクラッチを示す分解斜視図。
【図５】本発明の飾り縫いミシンの糸供給装置の上流側把持器および下流側把持器を示す断面図で、（ａ）は閉成状態の図、（ｂ）は開成状態の図。
【図６】本発明の飾り縫いミシンの糸供給装置の下流側把持器を示す分解斜視図。
【図７】本発明の飾り縫いミシンの糸供給装置の振動子、偏倚子および切換ツマミを示す分解斜視図。
【図８】本発明の飾り縫いミシンの糸供給装置の定型縫い振動子および変形縫い振動子と、糸供給駆動部の定型縫い振動子駆動カムおよび変形縫い振動子駆動カムとの関係を示す説明図で、（ａ）は平面図、（ｂ）は正面図。
【図９】本発明の飾り縫いミシンの糸供給装置の変速機構およびクラッチを用いた縫目切換機構を示す説明図で、（ａ）は正面図、（ｂ）は裏面図。
【図１０】本発明の飾り縫いミシンの糸供給装置のクラッチが連結している状態を示す説明図。
【図１１】本発明の飾り縫いミシンの糸供給装置の定型縫い振動子と変形縫い振動子とが同相で振動する場合における各振動子による縫糸量の偏倚・解放の状態を示す説明図で、（ａ）は布送り時における配置図、（ｂ）は縫目形成時における配置図。
【図１２】本発明の飾り縫いミシンの糸供給装置の定型縫い振動子と変形縫い振動子とが逆相で振動する場合における各振動子による縫糸量の偏倚・解放の状態を示す説明図で、（ａ）は布送り時における配置図、（ｂ）は縫目形成時における配置図。
【図１３】図１に示す飾り縫いミシンによる縫目結節点の位置が布上面のみで波形状に変化する飾り縫いの縫目を示す説明図。
【図１４】図１に示す飾り縫いミシンによる縫目結節点の位置が布上面から布下面に亘って波形状に変化する飾り縫いの縫目を示す説明図。
【図１５】本発明の飾り縫いミシンの糸供給装置のクラッチが解離している状態を示す説明図。
【図１６】縫針が上死点に位置する場合における定型縫い振動子、変形縫い振動子および各偏倚子の配置を示す図で、（ａ）は２本針オーバーロック縫いの配置図、（ｂ）は１本針オーバーロック縫いの配置図、（ｃ）は巻ロック縫いの配置図、（ｄ）は変形巻ロック縫いの配置図。
【図１７】図１に示す飾り縫いミシンによる２本針オーバーロック縫いの縫目を示す説明図。
【図１８】図１に示す飾り縫いミシンによる１本針オーバーロック縫いの縫目を示す説明図。
【図１９】図１に示す飾り縫いミシンによる巻ロック縫いの縫目を示す説明図。
【図２０】図１に示す飾り縫いミシンによる変形巻ロック縫いの縫目を示す説明図。
【符号の説明】
３１・・・・左針糸
３２・・・・右針糸
３３・・・・上ルーパ糸
３４・・・・下ルーパ糸
１００・・・・縫目形成装置
４０・・・・第１上流側把持器
４１・・・・第２上流側把持器
５０・・・・第３上流側把持器
６０・・・・第４上流側把持器
７０・・・・第１下流側把持器
７１・・・・第２下流側把持器
８０・・・・第３下流側把持器
９０・・・・第４下流側把持器
５０３、５０４・・・・定型縫い振動子
６００・・・・変速機構
６０１・・・・変形縫い振動子
６１０ａ・・・・固定部材
６２２・・・・切換ツマミ
６３７・・・・歯車止め
６５０・・・・クラッチ[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread supply device for a decorative sewing machine, and more particularly to a thread supply device for a decorative sewing machine that can supply a sewing thread to a stitch forming device that forms a stitch on a cloth without requiring a thread tension operation.
[0002]
[Prior art]
Conventionally, the upper looper thread tension and the lower looper thread tension are set to change the position of the seam knot of the upper looper thread and the lower looper thread, and wave-shaped (sine curve shape) decorative sewing is performed. Yes.
[0003]
For this reason, an attachment device having a mechanical mechanism that automatically adjusts the thread tension by the control of the thread tensioner is provided separately from the sewing machine, and the attachment device is externally attached to the sewing machine to decorate the wave shape (sine curve shape). A sewing machine that performs sewing is known (for example, see Patent Document 1).
[0004]
Furthermore, a computer overlock decorative sewing machine that controls the thread tension of the thread tensioner with a pulse motor is known (for example, see Patent Document 2).
[0005]
[Patent Document 1]
Japanese Utility Model Laid-Open No. 54-54468 (1-5 pages, FIGS. 1 and 2)
[Patent Document 2]
JP 2002-315984 A (page 4-10, FIG. 1-12)
[0006]
[Problems to be solved by the invention]
However, in these sewing machines, the thread tension is set by the control of the thread tensioner, so correction adjustment is required by manual operation according to the type of thread, the thickness of the thread, the cloth thickness, the sewing width, etc. There is a difficulty that it is difficult to deal with manual operation and stitch finish.
[0007]
The present invention has been made to solve such difficulties, and a plurality of sewing threads can be supplied as the amount of thread necessary for the first stitch so that the position of the stitch knot changes. It is another object of the present invention to provide a thread supply device for a decorative sewing machine that has a simplified mechanism, can ensure manufacturing accuracy, has improved durability, and can handle high-speed sewing.
[0008]
[Means for Solving the Problems]
A thread supply device for a decorative stitch sewing machine according to the present invention that achieves such an object is a yarn supply device for a decorative stitch sewing machine that supplies a plurality of sewing threads to a stitch forming device that forms stitches on a cloth. The upper side gripper that is closed when the stitch is formed by the stitch forming device and opened when the cloth is fed, and the sewing thread guided from the upstream side gripper. Opened at the time of stitch formation, the sewing thread is pulled out by the stitch forming device, and is driven in synchronism with the downstream gripper that is closed at the time of cloth feeding, and opened at the time of cloth feeding. A fixed stitch vibration that biases the thread of the thread path extending between the upstream gripper and the closed downstream gripper as the amount of thread necessary for the first stitch of the stitch forming device, and releases the stitch when the stitch is formed. Driven in synchronization with the child and the stitch forming device, and opened when the cloth is fed The sum of one thread amount and the other thread amount of at least two threads of the thread path extending between the flow side gripper and the closed downstream side gripper is constant, and the other increases as the one thread amount increases. The sewing machine is provided with a deformed sewing vibrator that is biased so as to change the sewing thread amount necessary for the first stitch and to release the sewing thread when forming the stitches.
[0009]
The deviation amount of the deformation sewing vibrator provided in the thread supply device for the decorative sewing machine of the present invention is set to 2 (W + t / 2). Alternatively, the amount of deviation of the deformed sewing vibrator is set to 2 (2W + t). (W is the overhang width and t is the cloth thickness.)
The thread supply device for a decorative sewing machine according to the present invention includes a speed change mechanism that drives the fixed stitch oscillator and the deformed stitch oscillator with a predetermined speed ratio for each stitch, and a speed change mechanism that operates the fixed stitch oscillator. The drive side and the driven side are cut off, and a clutch that transmits from the drive side to the driven side of the speed change mechanism is provided when the fixed sewing vibrator and the deformation sewing vibrator are operated.
[0010]
The thread supply device for a decorative sewing machine according to the present invention has a fixing member for fixing the deformed sewing vibrator so as not to be biased when the fixed sewing vibrator is operated.
[0011]
The thread supply device for a decorative sewing machine according to the present invention has a switching knob for switching between the operation of the standard sewing oscillator and the operations of the standard sewing oscillator and the deformation sewing oscillator with a clutch.
[0012]
In such a decorative stitch sewing machine thread supply device, when the cloth is fed, the upstream gripper is opened and the downstream gripper is closed in conjunction with the stitch forming device. The stitches are formed by biasing the thread of the thread path extending between the upstream gripper and the downstream gripper and by the biasing of the deformed sewing vibrator so as to change the sewing thread amount necessary for the first stitch. The amount of thread required for the first stitch of the device is secured, and when the stitch is formed, the upstream gripper is closed in conjunction with the stitch forming device, and the downstream gripper is opened. Each of the vibrators can release the thread of the thread path extending between the upstream gripper and the downstream gripper, so that the amount of sewing thread necessary for the first stitch of the stitch forming device can be supplied and As the amount of one of the threads increases, the amount of the other thread decreases In, it is possible to change the position of the stitch knot point of the sewing thread.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a thread supply device for a decorative sewing machine of the present invention will be described below with reference to the drawings.
[0014]
As shown in FIG. 1, a decorative sewing machine in which a thread supply device of the present invention is incorporated has a drive shaft 3 fixed to a flywheel 2 supported on a machine frame 1. The flywheel 2 is rotationally driven by a motor M via a timing belt B. A needle pin link 7 is pivotally supported by a connecting pin 10 at a U-shaped tip portion 6 a of a needle drive arm 6 pivotally supported by the machine frame 1. The needle link 7 is pivotally attached to a needle lock 8 slidably attached to a guide bar 11 fixed to the machine frame 1 by a connecting pin 12. The needle holder 8 is configured to fix two sewing needles 9A and 9B.
[0015]
In addition, it is configured by a mechanism that can be interlocked with the drive shaft 3, and is arranged with respect to the feed window of the throat plate 937 so that the main feed dog and the sub feed dog (not shown) move back and forth in the cloth feed direction. A stitch feed adjusting portion 900 for feeding the fabric. The stitch feed adjustment unit 900 is provided with a stitch adjustment dial 930 for adjusting the main feed, and a differential adjustment lever 940 for adjusting the sub-feed. The stitch feed adjusting unit 900 is a known technique (published in Japanese Patent Laid-Open No. 10-272273) and will not be described in detail.
[0016]
The main feed dog and the sub feed dog of the stitch feed adjusting unit 900 are pressed by the needle plate 937 by the presser foot 1050 fixed to the tip of the press bar 1051 slidably attached to the machine frame 1. The cloth can be moved with an appropriate cloth feed amount.
[0017]
Further, the decorative sewing machine has a sewing width adjusting unit 800 for changing the cloth cutting width (female cutting width) by the knife driving mechanism 36 for trimming the edge of the cloth immediately before sewing. The sewing width adjusting unit 800 is provided with a sewing width adjusting dial 802. Since the stitch width adjusting unit 800 is a known technique (published in Japanese Patent Laid-Open No. 10-272273), detailed description thereof is omitted.
[0018]
By the right sewing needle 9B, the upper looper 27, and the lower looper 21 of the stitch forming device 100 for the decorative stitch machine configured as described above, decorative stitches are formed on the cloth. A thread supply device is used to supply each sewing thread to the right sewing needle 9B, the upper looper 27, and the lower looper 21 of the stitch forming apparatus 100.
[0019]
As shown in FIGS. 1 and 2, the yarn supply device grips a yarn fed from a bobbin, is closed when a stitch is formed by the stitch forming device 100, and is opened when a cloth is fed. An upstream gripper 40, a second upstream gripper 41, a third upstream gripper 50, and a fourth upstream gripper 60 are provided.
[0020]
The first upstream gripper 40, the second upstream gripper 41, the third upstream gripper 50, and the fourth upstream gripper 60 are as shown in FIG. 1, FIG. 2, FIG. 3, FIG. The upstream gripping shaft 42 pivotally attached to each of the five upstream gripper support plates 43 fixed to the yarn supply unit substrate 501 fixed to the machine frame 1, and a pair of gripping dishes on the upstream gripping shaft 42 44, a pressure spring receiver 45, a compression spring 46, a thrust receiver 47, and a spring receiver 48. Of the five upstream gripper support plates 43, the four upstream gripper support plates 43 provided with the second upstream gripper 41, the third upstream gripper 50, and the fourth upstream gripper 60 are: Although fixed to the yarn supply unit substrate 501 via the upstream yarn supply unit plate 630, it may be directly fixed to the yarn supply unit substrate 501.
[0021]
The pair of gripping plates 44, the pressure spring receiver 45, the compression spring 46, the thrust receiver 47 and the spring receiver 48 are provided between the upstream gripper support plates 43 as a set. Specifically, a compression spring 46 is interposed between a pressure spring receiver 45 and a spring receiver 48 that are attached to the upstream gripping shaft 42. A thrust receiver 47 is screwed between the pair of gripping plates 44 and the pressure spring receiver 45 on the upstream gripping shaft 42. The thrust receiver 47 stops the pair of gripping plates 44 at predetermined positions via the pressure spring receiver 45 in order to release the yarns when the cloth is fed.
[0022]
Further, the yarn supplying device grips each thread guided from each of the first upstream gripper 40, the second upstream gripper 41, the third upstream gripper 50, and the fourth upstream gripper 60, and has a stitch. A first downstream gripper 70, a second downstream gripper 71, a third downstream gripper 80, which are opened at the time of forming and pulled out by the stitch forming device 100 and closed at the time of cloth feeding. A fourth downstream gripper 90 is provided (FIG. 2).
[0023]
The first downstream gripper 70, the second downstream gripper 71, the third downstream gripper 80, and the fourth downstream gripper 90 are shown in FIGS. 1, 2, 5, 6, and 7, respectively. As described above, the bias supply shaft 511, the spacer 512, the vibrator support shaft 508A, the spacer 509A, the vibrator support shaft 508B, the spacer 509B, and the bias support shaft are fixed to the yarn supply unit substrate 501 fixed to the machine frame 1. 521 and a spacer 522, and are provided on a yarn supply unit front plate 502 that is fixed by a coupling screw 510. The first downstream gripper 70, the second downstream gripper 71, the third downstream gripper 80, and the fourth downstream gripper 90 have five downstream sides fixed to the yarn supply unit front plate 502. A downstream gripping shaft 72 pivotally attached to each of the gripper support plates 73, and a pair of gripping plates 44, a pressure spring receiver 45, a compression spring 46, a thrust receiver 47, and a spring receiver 48 on the downstream gripping shaft 72. Have.
[0024]
The pair of gripping plates 44, the pressure spring receiver 45, the compression spring 46, the thrust receiver 47, and the spring receiver 48 are provided between the downstream gripper support plates 73 as a set. Specifically, a compression spring 46 is interposed between a pressure spring receiver 45 and a spring receiver 48 that are attached to the downstream gripping shaft 72. A thrust receiver 47 is screwed to the downstream gripping shaft 72 between the pair of gripping plates 44 and the pressure spring receiver 45. The thrust receiver 47 stops the pair of gripping plates 44 at predetermined positions via the pressure spring receiver 45 in order to release each thread when forming the stitches.
[0025]
As shown in FIGS. 2, 4, and 7, the yarn supply device includes a first upstream gripper 40, a second upstream gripper 41, a third upstream gripper 50, and a fourth upstream gripper 60. Is closed when the seam is formed, and is opened when the cloth is fed, and the first downstream gripper 70, the second downstream gripper 71, the third downstream gripper 80, and the fourth downstream gripper 90 are sewn. A yarn supply drive unit 300 is provided which is opened when the eyes are formed and closed when the cloth is fed. The yarn supply driving unit 300 rotates the yarn supply driving unit pulley 301 fixed to the drive shaft 3 (FIG. 1) via the timing belt 303 through the first upstream gripping device 40 and the second upstream gripping device 41. To the third upstream gripper 50, the fourth upstream gripper 60, the first downstream gripper 70, the second downstream gripper 71, the third downstream gripper 80, and the fourth downstream gripper 90. To communicate.
[0026]
Such a yarn supply driving unit 300 includes a pair of first yarns in which a yarn supply driving shaft pulley 302 around which a timing belt 303 that transmits the rotation of the yarn supply driving unit pulley 301 is wound is fixed to the yarn supply unit substrate 501. The yarn supply drive shaft 304 supported by the supply drive bearings 305A and 305A ′ is fixed to one end, and the other end of the yarn supply drive shaft 304 is fixed to a yarn gripping drive cam 307 formed with a front cam. . The front cam of the thread grip driving cam 307 closes the first upstream gripper 40, the second upstream gripper 41, the third upstream gripper 50, and the fourth upstream gripper 60 when forming the stitches. It is formed so as to synchronize with the stitch forming device 100 so as to grip the thread and open it when the cloth is fed.
[0027]
Such first upstream gripping device 40, second upstream gripping device 41, third upstream gripping device 50, fourth upstream gripping device 60, first downstream gripping device 70, and second downstream gripping device. In order to close and open 71, the third downstream gripper 80, and the fourth downstream gripper 90, the yarn supply drive unit 300 has a gripper opening / closing drive mechanism 300A (FIG. 4). This gripper opening / closing drive mechanism 300A includes a downstream gripper drive arm 310 and an upstream gripper release arm 311 on which cam followers 308 operated by a front cam of a thread gripping drive cam 307 are respectively attached by shafts 309. Yes. The downstream gripper drive arm 310 and the upstream gripper release arm 311 are supported by a gripper drive bearing 313 that is clamped between the yarn supply unit substrate 501 and the yarn supply unit front plate 502. The gripper drive shaft 312 is fixed to one end of the shaft 312, and a downstream gripper release arm 314 is fixed to the other end of the gripper drive shaft 312.
[0028]
In the gripper opening / closing drive mechanism 300A configured as described above, when the thread gripping drive cam 307 rotates, the upstream gripper release arm 311 is connected to one end of the upstream gripping shaft 42, and the downstream gripper release arm 314 is downstream. One end of the downstream gripping shaft 72 can be pushed up via the side gripper drive arm 310 (FIG. 5).
[0029]
The thread supply device is driven in synchronism with the stitch forming device 100, and is opened when the cloth is fed. The first upstream gripper 40, the second upstream gripper 41, and the third upstream gripper 50. The fourth upstream gripper 60 and the closed first downstream gripper 70, second downstream gripper 71, third downstream gripper 80, and fourth downstream gripper 90. A pair of fixed stitch vibrators 503 and 504 are provided that bias each sewing thread as a sewing thread amount necessary for the first stitch of the stitch forming device 100 and release each sewing thread when forming the stitch.
[0030]
The pair of fixed stitch vibrators 503 and 504 include first thread vibrators 503a and 504a, second thread vibrators 503b and 504b, third thread vibrators 503c and 504c, and fourth threads corresponding to needle threads and looper threads. Yarn vibrators 503d and 504d are respectively formed. Each of the first thread vibrators 503a and 504a, the second thread vibrators 503b and 504b, the third thread vibrators 503c and 504c, and the fourth thread vibrators 503d and 504d is supplied with a thread from each insertion port E. It has an inclined portion SS that is introduced into a yarn path point S that is aligned with each pair of yarn guides G1, G2 formed on the unit substrate 501 and the yarn supply unit front plate 502.
[0031]
The pair of fixed stitch vibrators 503 and 504 includes the first upstream gripper 40, the second upstream gripper 41, the third upstream gripper 50, the fourth upstream gripper 60, and the first downstream side. Yarn supply unit substrate 501 and yarn supply unit disposed between the gripper 70, the second downstream side gripper 71, the third downstream side gripper 80, and the fourth downstream side gripper 90 in the yarn feeding direction. Arranged between the front plates 502. Specifically, as shown in FIGS. 4, 7, and 8, the pair of fixed stitch vibrators 503 and 504 are connected to each other by a male thread portion formed on one side of the vibrator drive shaft 505 and a nut 507 via a spacer 506. The pair of fixed sewing oscillators 503 and 504 connected to each other are supported by vibrator support shafts 508A and 508B fixed between the thread supply unit substrate 501 and the thread supply unit front plate 502 so as to vibrate. A cam follower 525 is rotatably fixed to the other of the vibrator drive shaft 505, and the cam follower 525 protrudes from a hole 501 b formed in the yarn supply unit substrate 501 and is fixed to the yarn supply drive shaft 304. The fixed stitch sewing vibrator driving cam 306 is engaged with the groove 306a. The groove 306a of the regular stitching vibrator driving cam 306 is recessed so that the pair of regular stitching vibrators 503 and 504 can be vibrated via the vibrator driving shaft 505 by the rotation of the thread supply driving shaft 304. Yes.
[0032]
Further, the thread supply device has a pair of fixed stitch vibrators 503 and 504 of the thread path corresponding to the respective stitch amounts necessary for the first stitch that change according to the stitch width and stitch feed amount for forming stitches on the cloth. The first yarn biaser 514, the second yarn biaser 530, and the third yarn biaser 531 for adjusting the respective bias amounts biased by the first and second yarn biasers 531 are provided.
[0033]
The first thread bias 514, the second thread bias 530, and the third thread bias 531 are disposed between the pair of fixed stitch vibrators 503 and 504. The first thread biasor 514 corresponds to the thread groove 514b for introducing the sewing thread corresponding to the first thread vibrators 503a and 504a of the pair of fixed stitch vibrators 503 and 504, and the second thread vibrators 503b and 504b. A thread groove 514c for introducing a sewing thread is formed, and a biasing spindle 511 and one vibrator supporting shaft 508A fixed between the thread supply unit substrate 501 and the thread supply unit front plate 502 are arranged in the yarn feeding direction. It is supported to be movable in the vertical direction. Further, a hole 514a is formed at the lower end of the first yarn biasing element 514, and a first thread protruding from one end of a stitch feed adjusting biasing lever 520 that is pivotally attached to the yarn supply unit substrate 501 with a step screw 519. A bias drive shaft 520a is inserted. A spring hook 520 b projects from the stitch feed adjustment bias lever 520, and a tension spring 518 is stretched between the spring hook 520 b and a pin 501 a projecting from the thread supply unit substrate 501. Further, one end of the connecting link 517 is pivotally attached to the stitch feed adjusting bias lever 520 by a caulking step pin 516, and the other end of the connecting link 517 is pivotally attached to the deviation adjusting plate 513 by a caulking step pin 515. Yes. The bias adjusting plate 513 is supported by a biaser supporting shaft 511 and one vibrator supporting shaft 508A so as to be movable in a direction perpendicular to the yarn feeding direction.
[0034]
As a result, the seam feed adjustment bias lever 520 is constantly rotated and repelled in the clockwise direction when viewed from the yarn supply unit front plate 502 side. Will be.
[0035]
The second thread bias element 530 and the third thread bias element 531 are a thread groove 530d for introducing a thread corresponding to the third thread vibrators 503c and 504c of the pair of fixed stitch vibrators 503 and 504, and a fourth thread. Yarn grooves 531c for introducing yarns corresponding to the vibrators 503d and 504d are formed, respectively, and a biaser support shaft 521 fixed between the yarn supply unit substrate 501 and the yarn supply unit front plate 502 and the other vibrator support. The shaft 508B is supported so as to be movable in a direction perpendicular to the yarn feeding direction. A first spring hook 530a protrudes from one end of the second thread bias 530, and a tension is provided between the first spring hook 530a and the spring hook 502a protruding from one end of the yarn supply unit front plate 502. A spring 533 is stretched. As a result, the second yarn biasing element 530 is horizontally repelled in the right direction when viewed from the yarn feeding unit front plate 502 side. Further, a second spring hook 530b is projected from the other end of the second thread bias 530, and between the second spring hook 530b and a spring hook 531a projected from one end of the third thread bias 531. A tension spring 532 is stretched on the armature. As a result, the third yarn biasing element 531 is horizontally repelled in the left direction when viewed from the yarn feeding unit front plate 502 side.
[0036]
Further, as shown in FIGS. 2, 3, 4, and 7, the yarn supply device is driven in synchronism with the stitch forming device 100, and the first upstream gripper 40 opened when the cloth is fed, Second upstream gripper 41, third upstream gripper 50, fourth upstream gripper 60, closed first downstream gripper 70, second downstream gripper 71, third downstream gripper 80, the sum of one of the upper looper thread and the lower looper thread of the yarn path extending between the fourth downstream gripper 90 and the other loop thread is constant, and the other thread is increased as the one thread amount increases. A deformation sewing vibrator 601 is provided which is biased so as to change the amount of each thread necessary for the first stitch as the amount decreases and releases the sewing thread when forming the stitch. The deformed sewing vibrator 601 is formed with a first thread reel 601a and a second thread reel 601b corresponding to the looper thread.
[0037]
Such a deformation sewing oscillator 601 includes the first upstream gripper 40, the second upstream gripper 41, the third upstream gripper 50, the fourth upstream gripper 60, and the first downstream gripper 70, A yarn supply unit substrate 501 and an upstream yarn supply unit plate 630 disposed between the second downstream gripper 71, the third downstream gripper 80, and the fourth downstream gripper 90 in the yarn feeding direction. Arranged between. Specifically, the upstream thread supply unit plate 630 is fixed to the thread supply unit substrate 501 via the spacer 632 with a coupling screw 633, and is inserted into the oblong hole 601c formed in the deformed sewing vibrator 601. The two spacers 632 located on the side are loosely fitted, and the anti-rattle spacers 634 and 635 are arranged so as to sandwich the deformation sewing vibrator 601 and are supported by the two spacers 632 located on the inner side. Yes. As a result, the deformation sewing vibrator 601 is supported so as to be able to vibrate in a direction perpendicular to the yarn feeding direction while preventing rattling in the yarn feeding direction.
[0038]
Further, as shown in FIGS. 4, 7, 8, and 9, the thread supply device is a transmission mechanism that drives the regular stitching vibrators 503 and 504 and the deformation sewing vibrator 601 with a predetermined gear ratio for each stitch. And a clutch switching mechanism 650 for transmitting from the drive side to the driven side of the speed change mechanism 600 when the fixed stitch vibrators 503 and 504 and the deformed stitch vibrator 601 are operated.
[0039]
The speed change mechanism 600 is inserted into the thread supply drive shaft 304 and is connected to the fixed stitch vibrator drive cam 306 by a drive gear connection pin 616 and is fixed on the thread supply drive shaft 304 by a retaining ring 615. And a drive gear 614 that is inserted into a deformation sewing drive camshaft 613 that is pivotally supported by a pair of second thread supply drive bearings 305B and 305B ′ provided below the pair of first thread supply drive bearings 305A and 305A ′. And a driven gear 609 that meshes with. Further, a deformation sewing vibrator driving cam 606 is fixed to the deformation sewing drive cam shaft 613 and is connected to the driven gear 609 by a driven gear connection pin 608. It should be noted that the driven gear push-up spring 607 is formed on the end surface of the deformed stitch vibrator drive cam 606 so that the driven gear push-up spring 607 is interposed between the deformed stitch vibrator drive cam 606 and the driven gear 609. It is wound around the holding part 606b. As a result, the driven gear 609 is always elastically repelled so as to be separated from the deformation sewing vibrator driving cam 606.
[0040]
Further, a deformed stitch slider 602 that is disposed between the drive gear 614 and the first thread supply drive bearing 305A in the groove 606a of the deformed stitch vibrator drive cam 606 and is slidably inserted into the thread supply drive shaft 304. A cam follower 605 fixed to be rotatable by a cam follower shaft 604 is engaged with a lower portion of the cam follower shaft 604 (FIG. 8). The deformed stitch slider 602 has a guide groove 602a slidably engaged with a deformed stitch slider guide portion 630a formed at the lower portion of the upstream thread supply unit plate 630 at the upper portion, and further deformed stitch vibration at the side portion. The child 601 is fixed with a set screw 603. The groove 606a of the deformation sewing vibrator driving cam 606 is recessed so that the deformation sewing vibrator 601 can be vibrated through the cam follower 605 of the deformation sewing slider 602 by the rotation of the driven gear 609.
[0041]
In such a speed change mechanism 600, since the gear ratio is set to 24 for the drive gear 614 and 25 for the driven gear 609, the gear ratio is deformed with respect to the vibrations of the standard sewing vibrators 503 and 504. The vibration of the sewing vibrator 601 is driven with a delay of 1/25 in one rotation of the thread supply drive shaft 304. However, the speed is not limited to this, and other speed ratios may be set according to the sewing shape of the decorative stitch.
[0042]
The clutch 650 engages and disengages the drive gear 614 and the driven gear 609. The clutch 650 is in contact with the side surface of the driven gear 609 and is engaged with a clutch switching lever 610 that is movably carried by the deformed sewing drive cam shaft 613. A clutch switching receiving plate 612 that is pivotally supported on a clutch switching lever shaft 611 fixed to the clutch switching lever 610 and hinged to the clutch switching lever 610, and the clutch switching receiving plate 612 and the clutch switching. The lever 610 is wound around the clutch switching lever shaft 611 so that the lever 610 is repelled in the opposite rotational directions around the clutch switching lever shaft 611, one arm being the clutch switching lever 610 and the other arm being the clutch switching receiving plate 612. A clutch switching torsion coil spring 626 that is pressed in a repellent manner, and a clutch switching The bar 610 is always pressed against the driven gear 609, and the driven gear 609 is pulled toward the deformed sewing vibrator driving cam 606 against the elastic force of the driven gear push-up spring 607, and the driven gear 609 and the driving gear 614 10 is composed of a spring hook 636 fixed to the yarn supply unit substrate 501 and a clutch tension spring 627 stretched between the clutch switching receiving plate 612 (FIG. 10).
[0043]
The clutch switching lever 610 has a fixing member 610a at the upper end portion for fixing the deformed sewing vibrator 601 so as not to be biased when the fixed sewing vibrators 503 and 504 are operated. The fixing member 610a of the clutch switching lever 610 that is movably carried by the deformed stitch driving cam shaft 613 is deformed by the deformed stitch slider 602 when the clutch switching lever 610 rotates around the deformed stitch driving cam shaft 613 in a predetermined rotation direction. It is formed so that it may fall into the side surface of the convex part 602b formed in this.
[0044]
A switching knob 622 is provided for switching the operation of the regular stitching vibrators 503 and 504 and the operation of the regular stitching vibrators 503 and 504 and the deformation sewing vibrator 601 by the clutch 650. Specifically, the stitch switching knob fixed with set screws 623 and 624 below the portion to which the third downstream gripper 80 and the fourth downstream gripper 90 on the downstream side of the yarn supply unit substrate 501 are fixed. A base 620, a switching knob shaft 621 that is pivotally supported by the stitch switching knob base 620 in a direction perpendicular to the yarn feeding direction, and has a switching knob 622 fixed to one end thereof, and a stitch switching knob base 620 in the yarn feeding direction. On the other hand, the stitch switching is performed so that the upper receiving portion 619a formed at one end is engaged with the deformed stitching cam notch 621a and the fixed stitching cam notch 621b which are pivotally attached to the switching knob shaft 621 and are notched at the other end. An operating arm 619, a lower receiving portion 619 b that is slidably supported in the yarn supplying direction on the yarn supply unit substrate 501 and formed at the other end of the stitch switching operating arm 619 and a clutch switching receiving plate 612 are formed. Receiving part 12a, and a retaining ring 638 fitted in a stopper groove formed in the stitch switching operation shaft 618 located on the lower receiving portion 619b side of the stitch switching operation arm 619. And a compression spring 617 wound around the stitch switching operation shaft 618 (see FIG. 9).
[0045]
As shown in FIG. 1, the thread supply device for a decorative sewing machine constructed in this way further reduces the amount of deviation of the upper looper thread and the lower looper thread necessary for the first stitch at the time of winding lock stitching in standard sewing. The second thread bias 530 and the third thread bias are increased so that the amount of deviation of the upper looper thread necessary for the first stitch is increased and the amount of deviation of the lower looper thread is decreased when the modified winding lock stitching is performed so that the same amount is obtained. A stitch switching means 500, which is a switching means for shifting the child 531 (FIGS. 2 and 7), is provided.
[0046]
The stitch changeover means 500 rotates the stitch selection dial 560 and horizontally moves the stitch changeover cam plate 550, thereby making the winding lock sewing, the modified winding lock sewing, the one-needle overlock sewing, and the two-needle overlock sewing. Can be switched to. Since the stitch switching means 500 is a known technique (published in Japanese Patent Laid-Open No. 10-272273), detailed description is omitted.
[0047]
Further, in this thread supply device, the second thread bias 530 and the third thread bias 531 (FIGS. 2 and 7) are changed to the first stitch that changes according to the operation of the stitch width adjusting dial 802 of the stitch width adjusting unit 800. A thread tension fine adjustment means 400 is provided to drive in conjunction with the required amount of sewing thread. This thread tension fine adjusting means 400 connects the stitch width adjusting portion 800 and a wire hook 530e (FIG. 7) protruding from the second thread biasing element 530 by a stitch width adjusting interlocking wire 410, and also adjusts the stitch feed. The portion 900 and the wire hook 520c (FIGS. 1 and 7) of the stitch feed adjustment bias lever 520 are connected by the stitch feed adjustment interlocking wire 420. Since this thread tension fine adjustment means 400 is also a known technique (published in Japanese Patent Laid-Open No. 10-272273), detailed description thereof is omitted.
[0048]
The operation of the thread supply device for the decorative sewing machine having the above configuration will be described. In the description of the operation, when showing directionality, it is assumed that the sewing machine is viewed from the sewing manufacturer side.
[0049]
First, the case of performing deformation sewing (decorative sewing) will be described. When the switching knob 622 is rotated to select a deformation stitch and the deformed stitching cam notch 621a of the switching knob shaft 621 is engaged with the upper receiving portion 619a of the stitch switching operating arm 619, the stitch switching operation is performed. The lower end receiving portion 619b of the arm 619 moves backward so that the stitch switching operation shaft 618 can move to the lower end receiving portion 619b side of the stitch switching operation arm 619 by the elastic force of the compression spring 617. When the stitch switching operation shaft 618 moves to the lower end receiving portion 619 b side of the stitch switching operation arm 619, the receiving portion 612 a of the clutch switching receiving plate 612 hinged to the clutch switching lever 610 is connected to the clutch switching torsion coil spring 626. It rotates in the clockwise direction when viewed from the switching knob 622 side by the resilience. At the same time, the clutch switching lever 610 also rotates in the clockwise direction as viewed from the switching knob 622 due to the resilience of the clutch switching torsion coil spring 626, so that the convex portion 602b of the deformed stitching slider 602 is used for the standard stitching described later. The fixing member 610a of the clutch switching lever 610 falling on the side surface is released.
[0050]
When the fixing member 610a of the clutch switching lever 610 is disengaged from the side surface of the convex portion 602b of the deformation sewing slider 602, the clutch switching lever 610 becomes free to move in the axial direction of the deformation sewing driving cam shaft 613. The elastic gear 627 moves against the elastic force of the driven gear push-up spring 607 to move toward the deformed sewing vibrator drive cam 606 side, so that the driven gear 609 also moves toward the deformed sewing vibrator drive cam 606 side. . As a result, the driven gear 609 and the driving gear 614 are engaged with each other and the clutch 650 is connected, so that the rotation of the fixed stitch vibrator driving cam 306 can be transmitted to the deformed sewing vibrator driving cam 606. (FIGS. 9 and 10).
[0051]
After selecting the deformation stitch with the switching knob 622 in this manner, as shown in FIG. 11, the needle thread 31 is placed between the pair of gripping plates 44 of the first upstream gripper 40 and the first thread of the upstream thread supply unit plate 630. Thread guide G corresponding to the upstream gripper 40, thread guide G1 corresponding to the first upstream gripper 40 of the thread supply unit substrate 501, and first upstream gripper 40 corresponding to the first upstream gripper 40 of the fixed stitch oscillator 503 The insertion port E of the yarn vibrator 503a, the insertion port 514b of the first yarn biasing element 514, the insertion port E of the first yarn vibrator 504a corresponding to the first upstream gripper 40 of the fixed stitching vibrator 504, and the yarn supply unit The front plate 502 is inserted between the thread guide G2 corresponding to the first upstream gripper 40 and the pair of gripping plates 44 of the first downstream gripper 70 corresponding to the first upstream gripper 40. Further, the upper looper thread 33 is arranged between the pair of gripping plates 44 of the second upstream gripper 41, the thread guide G corresponding to the second upstream gripper 41 of the upstream thread supply unit plate 630, and the thread supply unit substrate 501. The thread guide G1 corresponding to the second upstream gripper 41, the insertion opening E of the first thread vibrator 503b corresponding to the second upstream gripper 41 of the fixed stitch oscillator 503, and the insertion opening of the first thread biaser 514 514c, the insertion port E of the first thread vibrator 504b corresponding to the second upstream gripper 41 of the fixed stitch vibrator 504, the thread guide G2 corresponding to the second upstream gripper 41 of the thread supply unit front plate 502, and Inserted between the pair of gripping plates 44 of the second downstream gripper 71 corresponding to the second upstream gripper 41. Further, the lower looper thread 34 is placed between the pair of gripping plates 44 of the fourth upstream gripper 60, the thread guide G corresponding to the fourth upstream gripper 60 of the upstream thread supply unit plate 630, and the thread supply unit substrate 501. The thread guide G1 corresponding to the fourth upstream gripper 60, the insertion opening E of the fourth thread vibrator 503d corresponding to the fourth upstream gripper 60 of the fixed stitch oscillator 503, and the insertion opening of the third thread biaser 531 531c, the insertion port E of the fourth thread vibrator 504d corresponding to the fourth upstream gripper 60 of the fixed stitch vibrator 504, the thread guide G2 corresponding to the fourth upstream gripper 60 of the thread supply unit front plate 502, and Inserted between the pair of gripping plates 44 of the fourth downstream gripper 90 corresponding to the fourth upstream gripper 60.
[0052]
After the insertion, the needle thread 31 passes through the thread guide and the needle thread balance, passes through the needle hole of the right sewing needle 9B, and the upper looper thread 33 and the lower looper thread 34 thread the thread for automatically threading using pressurized gas. It passes through the hook 35 of the upper looper 27 and the lower looper 21 through the container 35.
[0053]
When the sewing operation is started after the threading is completed in this way, the drive shaft 3 rotates, and the needle drive arm 6 performs one reciprocating swinging motion in one rotation, so the right sewing needle 9B moves one reciprocating up and down motion. I do. At this time, the yarn supply drive unit pulley 301 fixed to the drive shaft 3 rotates the yarn gripping drive cam 307 once through the timing belt 303, the yarn supply drive shaft pulley 302 and the yarn supply drive shaft 304. While the thread gripping drive cam 307 makes one rotation, the upstream gripper release arm 311 and the downstream gripper release arm 312 alternately swing by the front cam of the thread gripping drive cam 307. As a result, the upstream gripping shaft 42 and the downstream gripping shaft 72 are reciprocated while alternately moving rightward by the upstream gripper release arm 311 and the downstream gripper release arm 312, so that the first upstream gripping The first upstream gripper 70, the second upstream gripper 41, the third upstream gripper 50, and the fourth upstream gripper 60 are closed when the stitches are formed, and are opened when the cloth is fed. The 2 downstream gripper 71, the 3rd downstream gripper 80, and the 4th downstream gripper 90 can be opened at the time of stitch formation, and can be closed at the time of cloth feeding.
[0054]
Simultaneously with the operation of opening and closing each thread of such a gripper, in conjunction with the cam follower 525 fitted in the groove 306a of the fixed stitch vibrator driving cam 306 fixed to the driving shaft 3 in one rotation of the driving shaft 3. The fixed stitch oscillators 503 and 504 that perform reciprocating motion. At this time, the needle thread 31, the upper looper thread 33, and the lower looper thread 34 are respectively formed on the thread supply unit substrate 501 and the thread supply unit front plate 502 by the inclined portions SS of the fixed stitch vibrators 503 and 504, respectively. Are introduced at the yarn path point S which is aligned with the yarn guides G1 and G2. The needle thread 31, the upper looper thread 33, and the lower looper thread 34 are biased and released as a sewing thread amount necessary for the first stitch of the stitch forming device 100 by the reciprocating motion of the fixed stitch vibrators 503 and 504.
[0055]
In this way, the upper looper thread 33 and the lower looper thread 34 that are biased and released as the sewing thread amount required for the first stitch by the standard stitching vibrators 503 and 504 are further added and subtracted by the deformation sewing vibrator 601. The sum of the upper looper thread 33 and the lower looper thread 34 is constant. As the amount of one of the threads increases, the amount of the other thread decreases and the amount of each thread required for the first stitch is changed at a constant cycle. . That is, the rotational movement of the drive shaft 3 is driven by a drive gear connecting pin 616 connected and fixed to the side end of the fixed stitch vibrator driving cam 306 that vibrates the fixed stitch vibrators 503 and 504 via the thread supply drive shaft 304. The gear 614 is decelerated and transmitted to the deformed sewing vibrator driving cam 606 that vibrates the deformed sewing vibrator 601 through the driven gear 609 that meshes with 24 to 25. As a result, the vibration of the deformation sewing vibrator 601 is delayed by 1/25 with respect to one rotation of the drive shaft 3 (thread supply drive shaft pulley 302) with respect to the vibration of the fixed stitch vibrators 503 and 504, The vibrations of the regular stitching vibrators 503 and 504 and the vibration of the deformed sewing vibrator 601 are gradually reversed from the in-phase vibrations to the original in-phase vibrations after 25 rotations.
[0056]
During this time, the amount of one thread is changed by changing the amount of sewing thread adjusted by biasing / releasing by the standard stitching vibrators 503 and 504 and the biasing / releasing / absorption by the thread take-up portions 601a and 601b of the deformed sewing vibrator 601 depending on the timing difference that occurs. And the other sewing thread amount are constant, and as the one sewing thread amount increases, the other sewing thread amount decreases, and the sewing thread amount of each sewing thread required for the first stitch is changed at a constant cycle, and the upper looper thread 33 and Waveform edge stitching can be performed as a deformed stitch that changes the position of the stitch node of the lower looper thread 34 into a wave shape.
[0057]
The deviation and release of the sewing amount of the upper looper thread 33 and the lower looper thread 34 in this modified sewing will be described in detail. As shown in FIGS. 11 (a) and 11 (b), the right sewing needle 9B is lifted and is At the timing when the side grippers 40, 41, 50, 60 are opened and the downstream side grippers 70, 71, 80, 90 are closed, the fixed stitch vibrators 503, 504 and the deformed stitch vibrators 601 are in phase. Since the thread take-up portion 601b of the deformed stitching vibrator 601 is in a position to be deviated at the time of biasing, the lower looper thread 34 is biased by the thread take-up portion 601b of the deformed stitching vibrator 601 to the amount of sewing thread biased by the fixed stitch vibrators 503 and 504. The amount of sewing thread to be added is added to accumulate the maximum amount (FIG. 11A).
[0058]
At that time, the thread take-up portion 601a of the deformed sewing vibrator 601 is in a position where the upper looper thread 33 is released without being biased, and does not accumulate the yarn but stores only the amount of the sewing thread to which the fixed stitch vibrators 503 and 504 are biased (see FIG. 11 (a)).
[0059]
Subsequently, when the right sewing needle 9B descends from the top dead center and the upstream side grippers 40, 41, 50, 60 are closed and the downstream side grippers 70, 71, 80, 90 are opened during the formation of the stitches, the lower louver thread In 34, the amount of the sewing thread biased by the standard sewing vibrators 503 and 504 and the amount of the sewing thread biased by the thread take-up portion 601b of the deformation sewing vibrator 601 are simultaneously released. On the other hand, in the upper looper thread 33, the amount of sewing thread released by the fixed stitching vibrators 503, 504 is released when the biased thread amount 601a of the deformed stitching vibrator 601 is biased at the same time that the biased sewing thread amount of the fixed stitching vibrators 503, 504 is released. Is absorbed (FIG. 11B). That is, only the sewing thread amount obtained by subtracting the biased sewing thread amount of the standard stitching vibrators 503 and 504 by the biasing sewing thread quantity of the thread take-up portion 601a of the deformation sewing vibrator 601 is supplied.
[0060]
As a result, the lower looper thread 34 has an excess of the amount of sewing thread biased by the thread take-up portion 601b of the deformed sewing vibrator 601 and the upper looper thread 33 has an insufficient amount of sewing thread by which the thread take-up section 601a of the deformed stitch vibrator 601 is biased. The balance of the looper thread is changed, and the stitching knot of the upper and lower looper threads is tied to the position where the lower looper thread 34 remaining on the upper louver thread 33 with insufficient sewing amount is pulled and moved from the cloth edge position to the needle drop position side. Will do.
[0061]
Further, when the fixed stitch vibrators 503 and 504 and the deformed stitch vibrator 601 are biased in the opposite phase, as shown in FIGS. 12A and 12B, the right sewing needle 9B is lifted and upstream when the cloth is fed. At the timing when the side grippers 40, 41, 50, 60 are opened and the downstream side grippers 70, 71, 80, 90 are closed, the yarn reeling portion 601 a of the deformation sewing vibrator 601 is a position where the upper looper thread 33 is biased. Therefore, the upper looper thread 33 stores the maximum amount obtained by adding the amount of sewing thread biased by the thread take-up portion 601a of the deformation sewing vibrator 601 to the amount of sewing thread biased by the standard sewing vibrators 503 and 504 (FIG. 12 ( a)).
[0062]
At that time, the thread take-up portion 601b of the deformed sewing vibrator 601 is in a position where the lower looper thread 34 is released and is not biased, and the lower looper thread 34 stores only the amount of sewing thread to which the fixed stitch vibrators 503 and 504 are biased (see FIG. FIG. 12 (a)).
[0063]
Subsequently, when the right sewing needle 9B descends from the top dead center and the upstream side grippers 40, 41, 50, 60 are closed and the downstream side grippers 70, 71, 80, 90 are opened when the stitches are formed, the upper louver As for the thread 33, the amount of sewing thread biased by the standard stitching vibrators 503 and 504 and the amount of sewing thread biased by the thread take-up portion 601a of the deformation sewing vibrator 601 are simultaneously released. On the other hand, in the lower louver thread 34, the amount of sewing thread released by the standard stitching vibrators 503 and 504 is released simultaneously with the release of the thread amount 601b of the deformation sewing vibrator 601 by releasing the biased sewing thread amounts of the standard sewing vibrators 503 and 504. Is absorbed. That is, only the sewing thread amount obtained by subtracting the biased sewing thread amount of the standard stitching vibrators 503 and 504 by the biasing sewing thread quantity of the thread take-up portion 601b of the deformation sewing vibrator 601 is supplied (FIG. 12B).
[0064]
As a result, the upper looper thread 33 has an excess of the amount of sewing thread biased by the thread take-up portion 601a of the deformed stitching vibrator 601 and the lower looper thread 34 is insufficient due to insufficient sewing thread amount by which the thread take-up part 601b of the deformed stitching vibrator 601 is biased. When the balance of the looper thread is changed, the stitches of the upper and lower looper threads are tied to the position where the upper looper thread 33 remaining on the lower looper thread 34 with insufficient sewing thread is pulled and moved from the needle entry position to the fabric edge side. become.
[0065]
In this way, the vibration of the deformation sewing vibrator 601 is delayed by 1/25 of the rotation of the drive shaft 3 (thread supply drive shaft pulley 302) with respect to the vibration of the fixed stitch vibrators 503 and 504. The vibrations of the fixed stitch vibrators 503 and 504 and the vibration of the deformed stitch vibrator 601 are gradually changed from the in-phase vibrations to the opposite-phase vibrations to return to the original in-phase vibrations by 25 rotations, that is, the sewing is performed with 25 stitches. By repeating the cycle of returning to the seam knot point position, the positions of the stitch knot points of the upper looper thread 33 and the lower looper thread 34 can be changed to wave shapes as shown in FIG. Waveform edge stitching can be performed.
[0066]
It is to be noted that the stitching of the corrugated edge stitches of the deformed stitch that changes the position of the stitch knot of the upper looper thread 33 and the lower looper thread 34 shown in FIG. 13 into a wave shape between the needle drop on the cloth upper surface and the cloth edge. In the case of an eye, the amount of deviation of the deformation stitching vibrator 601 is the amount of deviation of the upper looper thread 33 biased by the thread take-up portion 601a of the deformation stitching vibrator 601 and the amount of biasing of the thread take-up portion 601b of the deformation stitching vibrator 601. The sum of the deviation amounts of the looper yarn 34 is set to be 2 (W + t / 2). Here, W is the overburden width and t is the cloth thickness.
[0067]
Further, as shown in FIG. 14, the position of the stitch knot of the upper looper thread 33 and the lower looper thread 34 changes to a wave shape from the needle drop on the upper surface of the cloth to the needle drop position on the lower face of the cloth beyond the cloth edge. In the case of the stitches of the curved edge of the deformed stitch to be stitched, the amount of deviation of the deformed stitch vibrator 601 is the amount of deviation of the upper looper thread 33 biased by the thread take-up portion 601a of the deformed stitch vibrator 601 and the deformation stitch vibration. The sum of the deviation amounts of the lower looper yarn 34 that is deflected by the yarn reeling portion 601b of the child 601 is set to 2 (2W + t).
[0068]
Next, the case where the single needle overlock sewing which is a standard stitch is performed will be described. When the switching knob 622 is rotated to select one-needle overlock sewing, the fixed stitch cam notch 621b of the switching knob shaft 621 and the upper receiving portion 619a of the stitch switching operating arm 619 are engaged. The lower end receiving portion 619b of the stitch switching operating arm 619 moves forward so that the stitch switching operating shaft 618 can move toward the receiving portion 612a of the clutch switching receiving plate 612 against the elastic force of the compression spring 617. When the stitch switching operation shaft 618 moves to the receiving portion 612 a side of the clutch switching receiving plate 612, the receiving portion 612 a of the clutch switching receiving plate 612 that is hinged to the clutch switching lever 610 is elastically repelled by the clutch switching torsion coil spring 626. When it is rotated counterclockwise when viewed from the switching knob 622 side against the force, but the deformation sewing slider 602 is moving rightward when viewed from the downstream thread supply unit plate 502 side, the clutch is switched. The fixing member 610a of the lever 610 collides with the upper surface of the convex portion 602b of the deformation slider 602, and its rotation is prevented (FIGS. 9 and 10).
[0069]
In such a state, when the drive shaft 3 is rotated to rotate the drive gear 614 fixed to the fixed stitch vibrator driving cam 306, the deformed sewing vibrator is driven via the driven gear 609 meshing with the drive gear 614. Since the cam 606 rotates, the deformed stitch slider 602 that stops at the rightmost position when viewed from the downstream thread supply unit plate 502 side via the cam follower 605 that engages with the groove 606a of the deformed stitch vibrator driving cam 606 is provided. When moving to the left, the fixing member 610a of the clutch switching lever 610 is detached from the upper surface of the convex portion 602b of the deformation slider 602 and falls to the side surface. That is, when the deformation sewing slider 602 is moving leftward as viewed from the downstream thread supply unit plate 502 side, the fixing member 610a of the clutch switching lever 610 collides with the upper surface of the convex portion 602b of the deformation slider 602. It will fall to the side without any problems (Fig. 15).
[0070]
In this way, after the fixing member 610a of the clutch switching lever 610 falls on the side surface of the convex portion 602b of the deformation sewing slider 602, the deformation sewing slider 602 moves to the leftmost position as viewed from the downstream thread supply unit plate 502 side. Is moved to the right from the leftmost position, the side surface of the convex portion 602b of the deformation slider 602 presses the end surface of the fixing member 610a of the clutch switching lever 610, so that the clutch switching lever 610 is subjected to the elastic force of the clutch tension spring 627. Accordingly, the driven gear 609 engaged with the drive gear 614 by the clutch switching lever 610b is disengaged from the drive gear 614 by the elastic force of the driven gear push-up spring 607, and the clutch 650 is moved. It becomes a dissociated state (FIG. 15). At this time, the deformed stitch slider 602 stops at the rightmost position when viewed from the downstream thread supply unit plate 502 side, so that the deformed stitch vibrator 601 does not vibrate after the drive shaft 3 rotates. Note that the driven gear 609 detached from the drive gear 614 is restricted in rotational movement by a gear stopper 637 fixed to a predetermined position of the yarn supply unit substrate 501.
[0071]
After selecting one-needle overlock sewing with the switching knob 622 in this way, as shown in FIG. 16B, the needle thread 32, the upper looper thread 33, and the lower looper thread 34 are respectively connected to the second upstream gripper 41. , Between the pair of gripping plates 44 of the third upstream gripper 50 and the fourth upstream gripper 60, the thread guide G corresponding to each thread of the upstream thread supply unit plate 630, and each thread of the thread supply unit substrate 501 Corresponding to the thread guide G1, each insertion port E of the vibrator 503, the insertion port 514c of the first yarn biaser 514, the insertion port 530d of the second yarn biaser 530, the insertion port 531c of the third yarn biaser 531, vibration Each insertion port E of the child 504, each thread guide G2 corresponding to each thread of the thread supply unit front plate 502, and each pair of the second downstream gripper 71, the third downstream gripper 80, and the fourth downstream gripper 90 Are inserted between the gripping plates 44. After the insertion, the needle thread 32 passes through the thread guide and the needle thread balance, passes through the needle hole of the right sewing needle 9B, and the upper looper thread 33 and the lower looper thread 34 thread the thread for automatically threading using pressurized gas. It passes through the hook 35 of the upper looper 27 and the lower looper 21 through the container 35.
[0072]
When the sewing operation is started after the threading is completed in this way, the drive shaft 3 rotates, and the upstream side gripper release arm 311 and the downstream side gripper release arm 312 are connected to the thread gripping drive cam in the same manner as in the case of deformation sewing. Oscillating motion is alternately performed by the front cam 307. As a result, the upstream gripping shaft 42 and the downstream gripping shaft 72 are reciprocated while alternately moving rightward by the upstream gripper release arm 311 and the downstream gripper release arm 312, so that the first upstream gripping The first upstream gripper 70, the second upstream gripper 41, the third upstream gripper 50, and the fourth upstream gripper 60 are closed when the stitches are formed, and are opened when the cloth is fed. The 2 downstream gripper 71, the 3rd downstream gripper 80, and the 4th downstream gripper 90 can be opened at the time of stitch formation, and can be closed at the time of cloth feeding.
[0073]
Simultaneously with the operation of opening and closing each thread of such a gripper, in conjunction with the cam follower 525 fitted in the groove 306a of the fixed stitch vibrator driving cam 306 fixed to the driving shaft 3 in one rotation of the driving shaft 3. The vibrators 503 and 504 that perform reciprocating motion. At this time, the needle thread 32, the upper looper thread 33, and the lower looper thread 34 are respectively paired with the pair of threads formed on the thread supply unit substrate 501 and the thread supply unit front plate 502 by the inclined portions SS of the vibrators 503 and 504, respectively. It is introduced at the yarn path point S that is aligned with the guides G1 and G2. By the reciprocating motion of the vibrators 503 and 504, the needle thread 32, the upper looper thread 33, and the lower looper thread 34 are biased and released as a sewing thread amount necessary for the first stitch of the stitch forming apparatus 100.
[0074]
When it is desired to select one stitch overlock sewing, two stitch overlock stitching, winding lock stitching, and modified winding lock stitching, which are standard stitches, the stitch selection dial 560 of the stitch switching means 500 is rotated. Can be switched.
[0075]
For example, when two-needle overlock stitching is selected with the stitch selection dial 560, the stitch switching cam plate 550 is positioned to the left as viewed from the front of the sewing machine, and the stitch width adjustment interlocking wire 410 is pulled up. The second yarn biasing element 530 on which the adjustment interlocking wire 410 is hooked is shifted leftward. At this time, the third yarn biasing element 531 is also shifted leftward by the tensile force of the tension spring 532. As a result, the second thread bias 530 and the third thread bias 531 and the third thread vibrators 503c and 504c and the fourth thread vibrators 503d and 504d are, as shown in FIG. When the right sewing needle 9B is located at the top dead center, the positional relationship is such that the amount of deviation of the upper looper thread 33 and the lower looper thread 34 is the largest. This is because, as shown in FIG. 17, the sewing width W of the upper looper thread 33 and the lower looper thread 34 is increased by the needle width WL as compared with the single-needle overlock sewing, winding lock sewing, and modified winding lock sewing described later. It is.
[0076]
In the two-needle overlock sewing, as shown in FIG. 16A, the left needle thread 31, the right needle thread 32, the upper looper thread 33, and the lower looper thread 34 are respectively connected to the first upstream gripper 40, Thread guides G and yarns corresponding to the respective sewing threads of the pair of gripping plates 44 of the second upstream gripper 41, the third upstream gripper 50, and the fourth upstream gripper 60 and the upstream thread supply unit plate 630 Thread guide G1 corresponding to each sewing thread of the supply unit substrate 501, each insertion port E of the vibrator 503, each insertion port 514b, 514c of the first yarn biaser 514, insertion port 530d of the second yarn biaser 530, third An insertion port 531c of the yarn biasing element 531, each insertion port E of the vibrator 504, a thread guide G2 corresponding to each thread of the thread supply unit front plate 502, a first downstream gripper 70, a second downstream gripper 71, Of the third downstream gripper 80 and the fourth downstream gripper 90 Respectively inserted between the pair of gripping plates 44. After insertion, the left needle thread 31 and the right needle thread 32 pass through thread guides and a needle thread balance, respectively, into the needle holes of the left sewing needle 9A and the right sewing needle 9B, and the upper looper thread 33 and the lower looper thread 34 use pressurized gas. Then, the yarns are passed through the thread loops of the upper looper 27 and the lower looper 21 through the threader 35 for automatically threading.
[0077]
When one-needle overlock stitching is selected with the stitch selection dial 560, the stitch-switching cam plate 550 moves to the right rather than the two-needle overlock stitching when viewed from the front of the sewing machine, and the stitch width adjustment interlocking wire 410 is moved. The second thread bias 530 on which the sewing width adjustment interlocking wire 410 is hooked is shifted to the right by the tensile force of the tension spring 533. At this time, the third yarn biasing element 531 is also shifted rightward by the tensile force of the tension spring 532. Thereby, the second thread bias 530 and the third thread bias 531 and the third thread vibrators 503c and 504c and the fourth thread vibrators 503d and 504d are, as shown in FIG. Is located at the top dead center, the positional relationship is such that the amount of deviation of the upper looper thread 33 and the lower looper thread 34 is reduced compared to the two-needle overlock stitching. This is because, as shown in FIG. 18, the sewing width W of the upper looper thread 33 and the lower looper thread 34 is reduced by the needle width WL as compared with the two-needle overlock sewing.
[0078]
When winding lock stitching is selected with the stitch selection dial 560, the stitch switching cam plate 550 moves to the right of the one-needle overlock stitching and the stitch width adjustment interlocking wire 410 is lowered, and this stitch width adjustment interlocking is performed. The second yarn biaser 530 on which the wire 410 is hooked is shifted to the right by the tensile force of the tension spring 533. At this time, the third yarn biasing element 531 is also shifted rightward by the tensile force of the tension spring 532. Thereby, the second thread bias 530 and the third thread bias 531 and the third thread vibrators 503c and 504c and the fourth thread vibrators 503d and 504d are, as shown in FIG. Is located at the top dead center, the positional relationship is such that the amount of deviation of the upper looper thread 33 and the lower looper thread 34 is reduced as compared with the single needle overlock sewing. This is because the cloth is wound as shown in FIG. 19, and the sewing width W of the upper looper thread 33 and the lower looper thread 34 is reduced as compared with the single-needle overlock stitching.
[0079]
The threading in the winding lock stitching is performed in the same manner as the single needle overlock stitching.
[0080]
Further, when the modified winding lock stitch is selected with the stitch selection dial 560, the stitch switching cam plate 550 moves to the right of the winding lock stitch and the sewing width adjustment interlocking wire 410 is pulled up. The second yarn biasing element 530 on which 410 is hooked changes to the same position as the single needle overlock. At this time, the insertion port 530d of the second yarn biaser 530 and the insertion port 531c of the third yarn biaser 531 are separated from each other. As a result, the second thread bias 530 and the third thread vibrators 503c and 504c have a biasing amount of the upper looper thread 33 when the right sewing needle 9B is located at the top dead center as shown in FIG. The positional relationship is such that the amount increases compared to the winding lock stitching. Further, the third thread biasing element 531 and the fourth thread vibrators 503d and 504d are arranged such that when the right sewing needle 9B is located at the top dead center, the biasing amount of the lower looper thread 34 is reduced compared to the winding lock stitching. It becomes positional relationship. This is because, as shown in FIG. 20, the upper looper thread 33 necessary for the first stitch wraps the front and back of the sewing width W of the cloth, and the lower looper thread 34 is directly connected to the upper looper thread 33 on the back surface of the cloth. .
[0081]
The threading in the modified winding lock sewing is performed in the same manner as the single needle overlock sewing.
[0082]
The specific thread supply operation of the thread supply apparatus according to the present embodiment is the same as that of the third upstream gripper 50, the third downstream gripper 80, and the third thread vibrator in one-needle overlock sewing. This will be described with reference to 503c and 504c and the second yarn biasing element 530.
[0083]
When the cloth is fed, as shown in FIG. 5B, the upstream gripping shaft 42 is pressed by the upstream gripper release arm 311, so that the compression spring 46 for the pair of gripping plates 44 of the third upstream gripper 50 is used. Is weakened by the rightward movement of the thrust receiver 47 and the spring receiver 45, and the third upstream gripper 50 is opened. At this time, since the downstream gripping shaft 72 is not pressed by the downstream gripper release arm 314, the elastic force of the compression spring 46 is applied to the pair of gripping plates 44 via the spring receiver 45. As a result, the third downstream gripper 80 is closed. At this time, the third yarn vibrators 503c and 504c move rightward while accumulating the upper looper yarn 32. Accordingly, the amount of sewing thread necessary for the first stitch of the stitch forming device 100 can be biased.
[0084]
Further, when forming the stitches, as shown in FIG. 5A, the upstream gripping shaft 42 is not pressed by the upstream gripper release arm 311, so that the elastic force of the compression spring 46 of the third upstream gripper 50 is reduced. It is applied to the pair of gripping plates 44 via the spring receiver 45. As a result, the third upstream gripper 50 is closed. At this time, since the downstream gripping shaft 72 is pressed by the downstream gripper release arm 314, the elastic force from the compression spring 46 against the pair of gripping plates 44 of the third upstream gripper 80 is the thrust receiver 47. The spring holder 45 is weakened by the rightward movement, and the third upstream gripper 80 is opened. At this time, since the third thread vibrators 503c and 504c move to the left, it is possible to release the sewing thread amount necessary for the first stitch of the stitch forming device 100.
[0085]
The second upstream gripper 41, the second thread vibrators 503b and 504b, the first thread biaser 514, the second downstream gripper 71, the fourth upstream gripper 60, the fourth thread vibrator 503d, Needless to say, the same yarn feeding operation is performed at 504d, the third yarn biasing element 531, and the fourth downstream gripper 90.
[0086]
In such a thread supply device, when adjusting the thread amount of the thread by changing the stitch width when the stitch is formed on the cloth, the thread width adjusting dial 802 is turned to adjust the thread tension fine adjustment means 400. The second thread bias 530 and the third thread bias 531 are shifted via the sewing width adjustment interlocking wire 410. That is, when the sewing width adjustment dial 802 is set so as to increase the sewing width, the sewing width adjustment interlocking wire 410 is pulled, so that the second thread bias 530 and the third thread bias 531 shift to the left. To do. As a result, the amount of deviation of the upper looper yarn 33 and the lower looper yarn 34 by the third yarn vibrators 503c, 504c and the fourth yarn vibrators 503d, 504d can be increased, so that FIG. 13, FIG. 14, FIG. The amount of the sewing thread when the sewing width W shown in FIGS. 18, 19 and 20 is wide can be increased.
[0087]
Further, when the sewing width adjustment dial 802 is set so that the sewing width is narrowed, the sewing width adjustment interlocking wire 410 is relaxed, so that the second thread bias element 530 and the third thread bias element 531 are tension springs 533. It is pulled by and shifts to the right. Accordingly, the amount of deviation of the upper looper yarn 33 and the lower looper yarn 34 by the third yarn vibrators 503c and 504c and the fourth yarn vibrators 503d and 504d can be reduced, so that FIG. 13, FIG. 14, FIG. The amount of sewing thread when the sewing width W shown in FIGS. 18, 19 and 20 is narrow can be reduced.
[0088]
Further, when adjusting the thread amount of the thread in response to the change of the stitch feed amount when forming the stitches on the cloth, the stitch adjustment dial 930 is turned to turn the stitch adjustment fine adjustment means 400 to feed the stitches. The stitch feed adjustment bias lever 520 is rotated through the adjustment interlocking wire 420. As a result, the first thread bias 514 engaged with the first thread bias driving shaft 520a of the stitch feed adjusting bias lever 520 is shifted. At the same time, since the bias adjusting plate 513 connected to the stitch feed adjusting bias lever 520 via the connecting link 517 shifts, the sewing width adjusting interlocking wire 410 connected to the bias adjusting plate 513 allows the first adjustment. The two-thread bias element 530 and the third thread bias element 531 are shifted.
[0089]
Therefore, when the stitch adjustment dial 930 is turned to change the stitch feed pitch P, the first thread biaser 514 can be interlocked with the stitch feed adjusting unit 900 via the thread tension fine adjusting means 400. The sewing thread amount required for the first stitch that changes in accordance with the operation of the stitch adjustment dial 930 can be made to correspond. At this time, if the stitch feed pitch P changes, not only the needle thread 32 (needle thread 31) but also the amount of sewing thread of the upper looper thread 33 and the lower looper thread 34 will change slightly, so that the second thread bias 530 and The third thread biaser 530 is also interlocked with the stitch feed adjusting unit 900 via the thread tension fine adjusting means 400.
[0090]
The yarn supplying device corresponds to the sewing thread amount required for the first stitch that changes the first thread bias 514, the looper thread bias 530, and the third thread bias 531 according to the thickness of the cloth presser 1050. In order to drive in conjunction, cloth thickness adjustment interlocking means disclosed in JP-A-10-272273 may be provided. Since this cloth thickness adjustment interlocking means is a known technique, detailed description thereof is omitted.
[0091]
In the present embodiment, the looper is described as a sewing machine including a pair of loopers. However, the present invention is not limited to this, and the same operation and effect can be obtained even in a sewing machine including two or more pairs of loopers.
[0092]
In the present embodiment, the first yarn vibrators 503a and 504a, the second yarn vibrators 503b and 504b, the third yarn vibrators 503c and 504c, and the lower looper vibration are applied to the pair of vibrators 503 and 504. The children 503d and 504d are formed, but the present invention is not limited to this, and each of these vibrators may be provided individually.
[0093]
【The invention's effect】
As described above, according to the thread supply device for a decorative sewing machine according to the present invention, a plurality of threads can be adjusted without manual adjustment according to the type of the sewing thread, the thickness of the sewing thread, the cloth thickness, the sewing width, and the like. Can be supplied as the amount of thread necessary for the first stitch so that the position of the stitch node changes. Also, since the device is not configured to set the thread tension by controlling the thread tensioner, the mechanism is simplified to ensure manufacturing accuracy, improve durability, and support high-speed sewing. A plurality of sewing threads can be supplied as the amount of sewing thread necessary for the first stitch so that the position of the stitch node changes.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing a decorative sewing machine to which a thread supply device for a decorative sewing machine according to the present invention is applied.
FIG. 2 is a perspective view showing a thread supply device for a decorative sewing machine according to the present invention.
FIG. 3 is a perspective view showing a thread supply device for a decorative sewing machine according to the present invention.
FIG. 4 is an exploded perspective view showing an upstream side gripper, a thread supply driving unit, a deformation sewing vibrator, a speed change mechanism, and a clutch of a thread supply device for a decorative sewing machine according to the present invention.
FIGS. 5A and 5B are cross-sectional views showing an upstream gripper and a downstream gripper of a thread supply device for a decorative sewing machine according to the present invention, wherein FIG. 5A is a closed state, and FIG. 5B is an open state.
FIG. 6 is an exploded perspective view showing a downstream side gripper of the thread supply device for a decorative sewing machine according to the present invention.
FIG. 7 is an exploded perspective view showing a vibrator, a biasing element, and a switching knob of the thread supply device for a decorative sewing machine according to the present invention.
FIG. 8 is a view showing the relationship between a regular stitching vibrator and a deformation sewing vibrator of a thread supply device for a decorative sewing machine according to the present invention, and a regular stitching vibrator driving cam and a deformation sewing vibrator drive cam of a thread supply drive unit; In the figure, (a) is a plan view and (b) is a front view.
FIGS. 9A and 9B are explanatory views showing a speed change mechanism and a stitch switching mechanism using a clutch of a thread supply device for a decorative stitch sewing machine according to the present invention, in which FIG. 9A is a front view, and FIG.
FIG. 10 is an explanatory view showing a state where the clutch of the thread supply device for a decorative sewing machine according to the present invention is connected.
FIG. 11 is an explanatory view showing the state of biasing / releasing of the sewing thread amount by each vibrator when the fixed sewing vibrator and the deformed sewing vibrator of the thread supply device of the decorative sewing machine of the present invention vibrate in the same phase; (A) is the layout at the time of cloth feeding, (b) is the layout at the time of stitch formation.
FIG. 12 is an explanatory view showing the state of biasing / releasing of the sewing thread amount by each vibrator when the fixed stitch vibrator and the deformed stitch vibrator vibrate in opposite phases of the thread supply device for a decorative sewing machine according to the present invention; (A) is the layout at the time of cloth feeding, (b) is the layout at the time of stitch formation.
13 is an explanatory view showing a stitch of decorative stitches where the position of the stitch node by the decorative stitch sewing machine shown in FIG. 1 changes to a wave shape only on the upper surface of the cloth.
14 is an explanatory view showing a stitch of decorative stitches in which the position of a stitch node by the decorative stitch sewing machine shown in FIG. 1 changes in a wave shape from the upper surface of the fabric to the lower surface of the fabric.
FIG. 15 is an explanatory view showing a state in which the clutch of the thread supply device for a decorative sewing machine according to the present invention is disengaged.
FIGS. 16A and 16B are diagrams showing the arrangement of a standard sewing oscillator, a deformation sewing oscillator, and each biasing element when the sewing needle is located at the top dead center, and FIG. 16A is an arrangement diagram of two-needle overlock sewing; ) Is a layout diagram of single-needle overlock stitching, (c) is a layout diagram of winding lock stitching, and (d) is a layout diagram of modified winding lock stitching.
17 is an explanatory view showing stitches of a two-needle overlock stitch by the decorative stitch sewing machine shown in FIG. 1. FIG.
18 is an explanatory view showing a stitch of one-needle overlock stitching by the decorative stitch sewing machine shown in FIG. 1. FIG.
FIG. 19 is an explanatory view showing stitches of the winding lock stitch by the decorative stitch sewing machine shown in FIG. 1;
20 is an explanatory view showing stitches of the modified winding lock stitch by the decorative stitch sewing machine shown in FIG. 1;
[Explanation of symbols]
31 ... Left needle thread
32 ... Right needle thread
33 ... Upper looper thread
34 ... Lower looper thread
100... Seam forming device
40... First upstream gripper
41... Second upstream gripper
50... Third upstream gripper
60... Fourth upstream gripper
70... First downstream gripper
71... Second downstream gripper
80... Third downstream gripper
90... Fourth downstream gripper
503, 504... Standard sewing vibrator
600... Transmission mechanism
601... Deformation sewing vibrator
610a... Fixing member
622... Switching knob
637 ... ・ Gear stopper
650... Clutch

Claims

布に縫目形成を行なう縫目形成装置に複数本の縫糸を供給する飾り縫いミシンの糸供給装置であって、
糸巻から給糸される前記縫糸を把持し、前記縫目形成装置により縫目形成時に閉成され、前記布の布送り時に開成される上流側把持器と、
前記上流側把持器から導かれた前記縫糸を把持し、前記縫目形成時に開成されて前記縫糸が前記縫目形成装置により引出され、前記布の布送り時に閉成される下流側把持器と、
前記縫目形成装置と同期して駆動され、前記布の布送り時に開成された前記上流側把持器および閉成された前記下流側把持器間に延びる糸道の前記縫糸を前記縫目形成装置の１縫目に必要な縫糸量として偏倚し、前記縫目形成時に前記縫糸を解放する定型縫い振動子と、
前記縫目形成装置と同期して駆動され、前記布の布送り時に開成された前記上流側把持器および閉成された前記下流側把持器間に延びる糸道の少なくとも２本の縫糸の一方の縫糸量と他方の縫糸量の和が一定で、一方の縫糸量が増加するに伴い他方の縫糸量が減少して前記１縫目に必要な各縫糸の縫糸量を変化させるように偏倚し、前記縫目形成時に前記縫糸を解放する変形縫い振動子とを備えたことを特徴とする飾り縫いミシンの糸供給装置。A thread supply device for a decorative sewing machine that supplies a plurality of sewing threads to a stitch forming device for forming stitches on a cloth,
An upstream gripper that grips the sewing thread fed from a bobbin, is closed when a stitch is formed by the stitch forming device, and is opened when the cloth is fed;
A downstream gripper that grips the sewing thread guided from the upstream gripper, is opened at the time of forming the stitch, is pulled out by the stitch forming device, and is closed at the time of feeding the cloth; ,
The stitch forming device drives the sewing thread of the yarn path that is driven in synchronism with the stitch forming device and extends between the upstream gripper opened when the cloth is fed and the closed downstream gripper. A fixed stitch vibrator that is biased as an amount of thread necessary for the first stitch and releases the thread when the stitch is formed;
One of at least two sewing threads of a thread path that is driven in synchronism with the stitch forming device and extends between the upstream gripper that is opened when the cloth is fed and the downstream gripper that is closed. The sum of the sewing thread amount and the other sewing thread amount is constant, and as the one sewing thread amount increases, the other sewing thread amount decreases to bias the sewing thread amount of each sewing thread required for the first stitch, A thread supply device for a decorative sewing machine, comprising: a deformed sewing vibrator that releases the sewing thread when the stitches are formed.

布に縫目形成を行なう縫目形成装置に複数本の縫糸を供給する飾り縫いミシンの糸供給装置であって、
糸巻から給糸される前記縫糸を把持し、前記縫目形成装置により縫目形成時に閉成され、前記布の布送り時に開成される上流側把持器と、
前記上流側把持器から導かれた前記縫糸を把持し、前記縫目形成時に開成されて前記縫糸が前記縫目形成装置により引出され、前記布の布送り時に閉成される下流側把持器と、
前記縫目形成装置と同期して駆動され、前記布の布送り時に開成された前記上流側把持器および閉成された前記下流側把持器間に延びる糸道の前記縫糸を前記縫目形成装置の１縫目に必要な縫糸量として偏倚し、前記縫目形成時に前記縫糸を解放する定型縫い振動子と、
前記縫目形成装置と同期して駆動され、前記布の布送り時に開成された前記上流側把持器および閉成された前記下流側把持器間に延びる糸道の少なくとも２本の縫糸の一方の縫糸量と他方の縫糸量の和が一定で、一方の縫糸量が増加するに伴い他方の縫糸量が減少して前記１縫目に必要な各縫糸の縫糸量を変化させるように偏倚し、前記縫目形成時に前記縫糸を解放する変形縫い振動子とを備え、前記変形縫い振動子の偏倚量は２（Ｗ＋ｔ／２）（但し、Ｗはかがり幅、ｔは布厚さとする。）に設定されていることを特徴とする飾り縫いミシンの糸供給装置。A thread supply device for a decorative sewing machine that supplies a plurality of sewing threads to a stitch forming device for forming stitches on a cloth,
An upstream gripper that grips the sewing thread fed from a bobbin, is closed when a stitch is formed by the stitch forming device, and is opened when the cloth is fed;
A downstream gripper that grips the sewing thread guided from the upstream gripper, is opened at the time of forming the stitch, is pulled out by the stitch forming device, and is closed at the time of feeding the cloth; ,
The stitch forming device drives the sewing thread of the yarn path that is driven in synchronism with the stitch forming device and extends between the upstream gripper opened when the cloth is fed and the closed downstream gripper. A fixed stitch vibrator that is biased as an amount of thread necessary for the first stitch and releases the thread when the stitch is formed;
One of at least two sewing threads of a thread path that is driven in synchronism with the stitch forming device and extends between the upstream gripper that is opened when the cloth is fed and the downstream gripper that is closed. The sum of the sewing thread amount and the other sewing thread amount is constant, and as the one sewing thread amount increases, the other sewing thread amount decreases to bias the sewing thread amount of each sewing thread required for the first stitch, A deformation sewing vibrator that releases the sewing thread when forming the stitches, and the deflection amount of the deformation sewing vibrator is 2 (W + t / 2) (where W is the overburden width and t is the cloth thickness). A thread supply device for a decorative sewing machine characterized by being set.

布に縫目形成を行なう縫目形成装置に複数本の縫糸を供給する飾り縫いミシンの糸供給装置であって、
糸巻から給糸される前記縫糸を把持し、前記縫目形成装置により縫目形成時に閉成され、前記布の布送り時に開成される上流側把持器と、
前記上流側把持器から導かれた前記縫糸を把持し、前記縫目形成時に開成されて前記縫糸が前記縫目形成装置により引出され、前記布の布送り時に閉成される下流側把持器と、
前記縫目形成装置と同期して駆動され、前記布の布送り時に開成された前記上流側把持器および閉成された前記下流側把持器間に延びる糸道の前記縫糸を前記縫目形成装置の１縫目に必要な縫糸量として偏倚し、前記縫目形成時に前記縫糸を解放する定型縫い振動子と、
前記縫目形成装置と同期して駆動され、前記布の布送り時に開成された前記上流側把持器および閉成された前記下流側把持器間に延びる糸道の少なくとも２本の縫糸の一方の縫糸量と他方の縫糸量の和が一定で、一方の縫糸量が増加するに伴い他方の縫糸量が減少して前記１縫目に必要な各縫糸の縫糸量を変化させるように偏倚し、前記縫目形成時に前記縫糸を解放する変形縫い振動子とを備え、前記変形縫い振動子の偏倚量は２（２Ｗ＋ｔ）（但し、Ｗはかがり幅、ｔは布厚さとする。）に設定されていることを特徴とする飾り縫いミシンの糸供給装置。A thread supply device for a decorative sewing machine that supplies a plurality of sewing threads to a stitch forming device for forming stitches on a cloth,
An upstream gripper that grips the sewing thread fed from a bobbin, is closed when a stitch is formed by the stitch forming device, and is opened when the cloth is fed;
A downstream gripper that grips the sewing thread guided from the upstream gripper, is opened at the time of forming the stitch, is pulled out by the stitch forming device, and is closed at the time of feeding the cloth; ,
The stitch forming device drives the sewing thread of the yarn path that is driven in synchronism with the stitch forming device and extends between the upstream gripper opened when the cloth is fed and the closed downstream gripper. A fixed stitch vibrator that is biased as an amount of thread necessary for the first stitch and releases the thread when the stitch is formed;
One of at least two sewing threads of a thread path that is driven in synchronism with the stitch forming device and extends between the upstream gripper that is opened when the cloth is fed and the downstream gripper that is closed. The sum of the sewing thread amount and the other sewing thread amount is constant, and as the one sewing thread amount increases, the other sewing thread amount decreases to bias the sewing thread amount of each sewing thread required for the first stitch, A deformation sewing vibrator that releases the sewing thread when forming the stitches, and the deflection amount of the deformation sewing vibrator is set to 2 (2W + t) (W is the overhang width and t is the cloth thickness). A thread supply device for a decorative sewing machine,

前記定型縫い振動子および前記変形縫い振動子を前記１縫目毎に所定の変速比をもって駆動する変速機構と、
前記定型縫い振動子を作動させるときは前記変速機構の駆動側と従動側を遮断し、前記定型縫い振動子および前記変形縫い振動子を作動させるときは前記変速機構の駆動側から従動側へ伝達するクラッチとを有することを特徴とする請求項１乃至請求項３の何れか１項記載の飾り縫いミシンの糸供給装置。A speed change mechanism that drives the fixed stitch vibrator and the deformed stitch vibrator with a predetermined speed ratio for each stitch;
When operating the standard sewing oscillator, the drive side and the driven side of the transmission mechanism are shut off, and when operating the standard sewing oscillator and the deformation sewing oscillator, the transmission is transmitted from the drive side to the driven side of the transmission mechanism. The thread supply device for a decorative sewing machine according to any one of claims 1 to 3, further comprising: a clutch for performing sewing.

前記定型縫い振動子を作動させるときは前記変形縫い振動子が偏倚しないように固定する固定部材を有することを特徴とする請求項１乃至請求項４の何れか１項記載の飾り縫いミシンの糸供給装置。The thread of the decorative sewing machine according to any one of claims 1 to 4, further comprising a fixing member that fixes the deformed sewing vibrator so as not to be biased when the fixed sewing vibrator is operated. Feeding device.

前記定型縫い振動子の作動と前記定型縫い振動子および前記変形縫い振動子の作動とを前記クラッチで切換える切換ツマミを有することを特徴とする請求項１乃至請求項５何れか１項記載の飾り縫いミシンの糸供給装置。The ornament according to any one of claims 1 to 5, further comprising a switching knob for switching between the operation of the fixed stitch oscillator and the operations of the fixed stitch oscillator and the deformed stitch oscillator by the clutch. Thread supply device for sewing machine.