JP3818380B2

JP3818380B2 - sewing machine

Info

Publication number: JP3818380B2
Application number: JP2003013119A
Authority: JP
Inventors: 雅夫小川; 素弘菰田
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2003-01-22
Filing date: 2003-01-22
Publication date: 2006-09-06
Anticipated expiration: 2023-01-22
Also published as: JP2004222895A

Description

【０００１】
【発明の属する技術分野】
本発明は、針棒の下端部に複数の針を装着可能なミシンに関する。
【０００２】
【従来の技術】
従来より、針棒の下端部に複数の針を装着可能なミシンには、種々の型式のものが提案されているが、例えば、特許文献１に記載のミシンにおいては、針棒の下端部に設けられた針止め金具に、水平方向に所定距離離隔した位置において２つの針取付穴が形成され、これら２つの針取付穴に水平方向に装着されたビスにより夫々２本の針が固着される。また、特許文献２に記載の２本針ミシンにおいては、針棒の下端部に、２つの針抱きが水平方向に装着されたビスで夫々固定されており、これら２つの針抱きに夫々２本の針が取付ビスで固着される。
【０００３】
【特許文献１】
実開昭５３−６８３６４号公報（第１頁、図１）
【特許文献２】
特開平３−２３６８９５号公報（第２頁、第３図）
【０００４】
【発明が解決しようとする課題】
しかし、前記特許文献１に記載のミシンにおいて、２つの針取付穴の離隔距離が大きい場合には、針棒の下端部に固定される針止め金具の水平方向の長さが長くなり、縫製時に針棒を上下動させる際のミシンモータの負荷が大きくなってしまう。
【０００５】
一方、前記特許文献２に記載のミシンにおいては、２つの針抱きが夫々水平方向に装着された２つのビスで直接針棒に固定されているため、縫製中に針棒を上下動させる駆動力がこれら２つのビスにも繰り返し作用することになる。特に、２つの針の離隔距離が大きい場合には、２つのビスに大きな力が繰り返し作用するため、ビスのネジ部が劣化したり破損したりして、針棒から針抱きを取り外すことが困難になる虞がある。
【０００６】
本発明の目的は、第２の針を支持する針取付具を針棒に対して取付けやすくするとともに、その針取付具の針棒に対する回転を簡単な構造で規制することができるミシンを提供することである。
【０００７】
【課題を解決するための手段】
請求項１のミシンは、ミシン本体に上下動自在に配設された針棒と、この針棒の下端部に縫製用の目孔付きの第１の針を固定する為の針抱きと、前記針棒から水平方向に所定距離離隔して位置する第２の針と、前記針棒を挟持可能な第１の挟持部と第２の針を挟持可能な第２の挟持部とを有し第２の針を針棒に取付ける為の針取付具と、前記針取付具に対して前記針棒と第２の針とを挟持する方向に締結可能に装着される締結部材であって、これを締結することにより第１、第２の挟持部で針棒と第２の針とを挟持する締結部材とを備えたミシンにおいて、前記針抱きに、第１の針を装着して縫製する際に糸を案内する針棒糸案内と、この針棒糸案内を針棒に固定する為の取付部材とを備え、前記針取付具に、前記取付部材と係合可能な回転規制部を形成し、前記第１の挟持部で針棒を挟持した状態では、前記取付部材が前記回転規制部に係合して針取付具の針棒に対する回転を規制するように構成したものである。
【０００８】
このミシンにおいては、針棒の下端部の針抱きに縫製用の目孔付きの第１の針を装着可能であり、第１の針を針抱きに装着した状態で針棒を上下動させて第１の針から下方へ延びる上糸を下糸に交絡させて加工布に縫目を形成する。さらに、針棒には、針棒から水平方向に所定距離離隔した位置に、第２の針を針取付具により取付けることも可能である。ここで、針棒と第２の針とを挟持する方向に締結部材が装着されており、締結部材を締結することにより、針取付具の第１の挟持部で針棒が挟持され、第２の挟持部で第２の針が挟持されて、第２の針が針取付具を介して針棒に取付けられる。
また、針棒に針棒糸案内が取付部材により固定された状態で、締結部材を締結して針取付具を連結すると、針取付具に形成された回転規制部に取付部材が係合して、針取付具の針棒に対する回転が規制される。
【０００９】
【００１０】
【００１１】
請求項２のミシンは、請求項１の発明において、前記１対の挟持部材の一方に他方側へ突出する位置決めピンが設けられ、他方に前記位置決めピンが係合可能なピン穴が形成されたものである。分離状態にある１対の挟持部材を連結する場合には、１対の挟持部材の一方に設けられた位置決めピンを他方に設けられたピン穴に係合させて、一方の挟持部材の他方に対する位置を決めてから、締結部材が締結される。
【００１２】
【００１３】
【００１４】
請求項３のミシンは、請求項１又は２の発明において、前記第２の針は、複数の針本体部と、これら複数の針本体部を保持し且つ前記第２の挟持部に挟持される針保持部とを有するものである。従って、針保持部が第２の挟持部に挟持されて第２の針が針取付具を介して針棒に取付けられ、この状態で針棒が上下動して複数の針本体部が被加工物を貫通する。
【００１５】
請求項４のミシンは、請求項３の発明において、前記針棒の径と針保持部の径とが異なるものである。従って、誤って針棒が第２の挟持部に挟持されたり、あるいは、針保持部が第１の挟持部に挟持されてしまうことがない。
【００１６】
請求項５のミシンは、請求項３又は４の発明において、前記複数の針本体部には夫々複数の引掛け爪が形成され、針板上に２つの被加工物が上下に重ねて戴置された状態で、前記複数の引掛け爪により上側の被加工物の一部を引っ掛けながら第２の針を２つの被加工物に貫通させて、下側の被加工物にニードルパンチング加工を施すように構成したものである。
【００１７】
このミシンは、加工布等の上に戴置された毛糸や綿等の装飾材等の一部を、複数の針本体部を有する第２の針により加工布の中に上から押し込んで、加工布等に刺繍的な装飾模様を施す、いわゆるニードルパンチング加工を可能に構成されている。即ち、針板上に加工布及び装飾材などからなる２つの被加工物が上下に重ねて戴置された状態で、針取付具を介して針棒から所定距離離れた位置に取付けられた第２の針を上下動させると、第２の針の複数の針本体部に形成された複数の引掛け爪が上側の被加工物の一部を引っ掛け、その状態で第２の針を２つの被加工物に貫通させることで、下側の被加工物に装飾模様が施される。
【００１８】
【００１９】
【発明の実施の形態】
本発明の実施の形態について説明する。本実施形態は、加工布の上に重ねて戴置された装飾材としての毛糸を加工布に押し込んで加工布に刺繍的な装飾模様を施すニードルパンチング加工が可能なミシンに本発明を適用した一例である。
【００２０】
図１〜図３に示すように、ミシンＭは、水平なベッド部１と、このベッド部１の右端部に立設された脚柱部２と、ベッド部１と平行に脚柱部２から左方へ延びるアーム部３と、このアーム部３の左端部に設けられたヘッド部４などを備えている。このミシンＭにおいては、図３、図４に鎖線で示すように、ヘッド部４の針棒３０の下端部に縫製用の目孔１３ａ（図８参照）付きの縫針１３（第１の針に相当する）を装着した状態では、上糸と下糸を交絡させてベッド部１に戴置された加工布に縫目を形成する通常縫製を行うことができる。
【００２１】
一方、図１〜図４に実線で示すように、針棒３０から水平方向左方に所定距離離隔した位置に後述のパンチング針１４（フェルティングニードルともいい、第２の針に相当する）を装着した状態では、図１２、図１３に示すように、パンチング針１４により、ベッド部１上の加工布８０（下側の被加工物）の上に重ねた装飾材としての毛糸８１（上側の被加工物）を加工布８０に押し込んで、上糸や下糸を用いずに加工布８０に刺繍的な装飾模様を形成するニードルパンチング加工を加工布８０に施すことができる。
【００２２】
図２、図４に示すように、ベッド部１の内部には、縫針１３を用いて通常縫製を行う際に針棒３０の下方において上糸を捕捉する釜機構１０が設けられており、ベッド部１において釜機構１０の上側には通常縫製用の針板１１とニードルパンチング加工用の針板１２の何れか一方が装着される。即ち、図５、図６（ベッド部１側から針板１１，１２を見た図）に示すように、ミシンＭには、釜機構１０の上側に位置し縫針１３が通過する針穴１１ａを備えた針板１１と、この釜機構１０よりも左方に位置しパンチング針１４が通過する針穴１２ａを備えた針板１２の、２種類の針板１１，１２が付属しており、通常縫製あるいはニードルパンチング加工を行う際に、これら２種類の針板１１，１２のうち一方を選択してベッド部１に装着するように構成されている。
【００２３】
図１〜図４に示すように、ベッド部１の左端部には、蓋部材１５が開閉可能に装着され、蓋部材１５を開いてベッド部１を開放した状態で且つ後述のダストボックス１６が無い状態では、釜機構１０の下糸ボビンを交換できるようになっている。さらに、ニードルパンチング用の針板１２がベッド部１に装着されている場合には、蓋部材１５と釜機構１０との間の空間において、パンチング針１４でニードルパンチング加工を行う際に針穴１２ａから下方へ落ちる糸屑や布屑等の繊維屑を収容するダストボックス１６が、針板１２の下側に取り付けられたホルダ部１７に着脱可能に装着される。さらに、ベッド部１には、加工布を前後方向に移動させる送り機構（図示略）も設けられ、２種類の針板１１，１２には、この送り機構の送り歯を針板１１，１２から出没させる為の複数の開口部１１ｂ，１２ｂが夫々形成されている。
【００２４】
脚柱部２には、起動／停止スイッチ２０、送り調節ダイヤル２１、返し縫いレバー２２、ハンドプーリ２３等が設けられ、アーム部３には、持ち運び用の取っ手２４が設けられている。
【００２５】
図２〜図４に示すように、ヘッド部４には、ミシン本体としてのミシン機枠１８に上下動自在に配設された針棒３０と、この針棒３０を上下に駆動する針棒上下動機構３１と、ミシン機枠１８に上下揺動自在に配設された天秤３２と、針棒３０の下端部に縫針１３を固定する為の針抱き３３と、針抱き３３に縫針１３を装着して通常縫製を行う際に天秤３２から縫針１３の目孔１３ａへ延びる上糸を案内するワイヤ状の針棒糸案内３４などを備えている。さらに、ヘッド部４には、糸調子器３５、糸案内３６等も設けられている。
【００２６】
図７、図８に示すように、針抱き３３には、縫針１３を針抱き３３に装着する為のビス４０と、縫針１３が逆に取付けられるのを防止する針逆付け防止板４１とが設けられ、ビス４０により針抱き３３自体も針棒３０に固着されている。この針抱き３３の上側には針棒糸案内３４が設けられており、針棒糸案内３４は、上側の取付部３４ａと、この取付部３４ａの下端から水平方向に湾曲状に張り出した糸案内部３４ｂとを一体形成したものである。そして、針棒糸案内３４の糸案内部３４ｂが針抱き３３を抱えた状態で、針棒糸案内３４は取付ビス４２（取付部材に相当する）により針棒３０に固定されている。従って、縫針１３を針抱き３３に装着する為のビス４０が緩められている状態でも、針抱き３３は針棒糸案内３４に抱えられて針棒３０から脱落しないようになっている。
【００２７】
針棒上下動機構３１は、ミシンモータ（図示略）の駆動力を針棒３０に伝達して針棒３０を上下に駆動するものであり、公知の構成であるためその説明は省略するが、針抱き３３に縫針１３が装着された状態で、この針棒上下動機構３１により針棒３０が上下に駆動されると、通常縫製用の針板１１の下側において縫針１３の目孔１３ａから下方へ延びる上糸が釜機構１０の剣先により下糸と交絡して、針板１１上の加工布に縫目が形成される。
【００２８】
図２〜図４に示すように、針棒３０の後側には、押え棒４４が針棒３０と平行で且つミシン機枠１８に対して上下動可能に配設されており、この押え棒４４の下端部には、針棒３０の下端部に異物が侵入するのを防止する為の保護カバーと、加工布を押える布押えを取付けた保護カバーホルダとを取付可能である。ここで、保護カバーホルダとしては、通常縫製用の保護カバーホルダ（図示略）とニードルパンチング用の保護カバーホルダ４５の、２種類の保護カバーホルダが予め用意されており、加工布に通常縫製又はニードルパンチング加工を行う際に、これら２種類の保護カバーホルダのうち一方を選択的に押え棒４４に取付けるように構成されている。
【００２９】
通常縫製用の保護カバーホルダに装着される保護カバー（図示略）及び布押え（図示略）は、一般的なミシンに用いられるものであるため、その詳細な説明は省略するが、通常縫製用の保護カバーホルダを押え棒４４の下端部に連結した状態では、通常縫製用の布押えは針棒３０の真下に位置することになり、この布押えにより縫針１３が通過する針穴１１ａ付近の加工布が押えられる。
【００３０】
図２〜図４に示すように、ニードルパンチング加工を行う場合には、押え棒４４の下端部にはニードルパンチング用の保護カバーホルダ４５が連結される。この保護カバーホルダ４５には、透明な合成樹脂製の保護カバー４６が取付けられており、この保護カバー４６により、針棒３０の下端部付近の前方が覆われている。
【００３１】
さらに、保護カバーホルダ４５の左端部には、取付金具４７を介して平面視略矩形状で且つ透明な合成樹脂製の布押え４８が取付けられている。図９に示すように、布押え４８は、平面状に形成されパンチング針１４が通過する針穴１２ａ付近の加工布８０を押える押え部４８ａと、この押え部４８ａの前端部、左端部、及び右端部に夫々押え部４８ａから上方へ延びる鉛直壁状に形成された前壁部４８ｂ、左壁部４８ｃ及び右壁部４８ｄとを有する。押え部４８ａの中央部には、パンチング針１４が通過する円形穴４８ｅが形成されている。
【００３２】
さらに、前壁部４８ｂには、加工布８０の上に重ねられた毛糸８１を前後方向に案内する案内穴４８ｆも形成されている。従って、毛糸８１は、案内穴４８ｆにより後方へ案内され、さらに、押え部４８ａの上側から円形穴４８ｅを通って押え部４８ａの下側に出て、加工布８０の上に重ねて戴置される。ここで、毛糸８１が案内穴４８ｆを通過する際には、前壁部４８ｂに前後方向の力が作用することになるが、前壁部４８ｂは、左壁部４８ｃ及び右壁部４８ｄと一体形成されているため、前壁部４８ｂは左壁部４８ｃ及び右壁部４８ｄにより前後方向に支えられており、前壁部４８ｂが破損することがない。
【００３３】
ここで、図２〜図４に示すように、保護カバー４６と針板１２との間には、所定間隔の隙間が形成され、保護カバー４６の下端が加工布８０や毛糸８１に接触して、送り機構による加工布８０や毛糸８１の前後方向の移動が妨げられないようになっている。さらに、保護カバー４６と加工布８０との間の隙間に前壁部４８ｂが位置するため、保護カバー４６と前壁部４８ｂによりパンチング針１４の針落ち位置へ外部から異物が侵入するのを防止できる。また、保護カバー４６及び布押え４８は透明な合成樹脂で構成されているので、作業者は、針板１２上の加工布８０及び毛糸８１の状態を確認しながらニードルパンチング加工を行うことができる。
【００３４】
尚、図２、図３に示すように、押え棒４４には押え上げレバー４９が設けられ、加工布８０及び毛糸８１を取り替える際には、押え上げレバー４９を操作することで押え棒４４を上下動させて、布押え４８を昇降させることができる。
【００３５】
ところで、前述したように、ミシンＭは、目孔１３ａ付きの縫針１３で針板１１上の加工布に通常の縫製を行う他に、針板１２上の加工布８０の上に毛糸８１を重ねて加工布８０にニードルパンチング加工を施すことが可能に構成されており、ミシンＭは、針棒３０から水平方向左方に所定距離離隔して位置するニードルパンチング用のパンチング針１４と、針棒３０を挟持可能な第１挟持部５１とパンチング針１４を挟持可能な第２挟持部５２とを有しパンチング針１４を針棒３０に取付ける為の針取付具５０とを有する。
【００３６】
図１０、図１１に示すように、パンチング針１４は、複数（例えば、５本）の針本体部１４ａと、これら複数の針本体部１４ａを保持し且つ針取付具５０の第２挟持部５２に挟持される針保持部１４ｂとを有する。図１１に示すように、複数の針本体部１４ａには夫々複数の引掛け爪１４ｃが形成されている。そして、針板１２上の加工布８０の上に毛糸８１を重ね合わせて布押え４８で上方から押えた状態で、針棒上下動機構３１により針棒３０を上下に駆動して、図４の実線に示す位置から鎖線に示す位置に亙ってパンチング針１４を上下動させると、図１２、図１３に示すように、複数の引掛け爪１４ｃにより毛糸８１の一部を引っ掛けて加工布８０に押し込みながら複数の針本体部１４ａが加工布８０と毛糸８１とを貫通するように構成されている。針保持部１４ｂは、上半部の小径部と下半部の大径部とからなり、小径部が針取付具５０の第２挟持部５２に挟持される。
【００３７】
このパンチング針１４は、針棒３０から左方へ所定距離ずらした位置に針取付具５０を介して取付けられるため、ニードルパンチング加工により針穴１２ａを通ってベッド部１の内部に落下する糸屑や布屑等の繊維屑は、針板１２の下側に装着されたダストボックス１６に収容され、繊維屑が釜機構１０に絡まないように構成されている。
【００３８】
図７、図１４に示すように、針取付具５０は、左右に水平に延びるブロック状に形成され且つ円柱穴状の第１、第２挟持部５１，５２を形成する前後１対の挟持部材５３，５４を有する。これら１対の挟持部材５３，５４の右側部分には、第１挟持部５１を形成する平面視半円弧状の１対の第１凹部５３ａ，５４ａが夫々対向状に形成され、一方、１対の挟持部材５３，５４の左側部分には、第２挟持部５２を形成する平面視半円弧状の１対の第２凹部５３ｂ，５４ｂが夫々対向状に形成されている。
【００３９】
この針取付具５０には、前後方向（針棒３０とパンチング針１４とを挟持する方向）に、ネジ径の異なる３本のビス５５〜５７が装着される。即ち、前側の挟持部材５３には、３本のビス５５〜５７のネジ径よりも僅かに大きい３つの穴が夫々形成されており、一方、後側の挟持部材５４には、３本のビス５５〜５７のネジ径と一致する雌ネジが切られた３つの穴が夫々形成されている。そして、３本のビス５５〜５７は、前側の挟持部材５３の３つの穴に夫々挿通されて、後側の挟持部材５４の３つの穴に夫々螺合可能である。３本のビス５５〜５７を緩めた状態（締結状態を解除した状態）では、１対の挟持部材５３，５４は互いに分離可能に構成されている。そして、３本のビス５５〜５７を締結することにより第１、第２挟持部５１，５２で針棒３０とパンチング針１４とを挟持するように構成されている。尚、図３に示すように、１対の挟持部材５３，５４が、針抱き３３の上端面に当接して上下方向に位置決めされた状態で、第１挟持部５１により針棒３０が挟持される。
【００４０】
ところで、針保持部１４ｂの小径部の径は針棒３０の径よりも小さく形成されており、それに伴い、図１４に示すように、第２挟持部５２の穴径も、第１挟持部５１の穴径より小さく形成されている。従って、針取付具５０を針棒３０に取付ける際に、誤って針棒３０を第２挟持部５２を形成する第２凹部５３ｂ，５４ｂで挟んだ場合でも、穴径の小さい第２挟持部５２では針棒３０を挟持することができないため、作業者がすぐにその間違いに気づくようになっている。
【００４１】
前側の挟持部材５３の第２凹部５３ｂのすぐ右側の部分には、後方へ突出する位置決めピン５８が設けられ、一方、後側の挟持部材５４には、位置決めピン５８が係合可能なピン穴５９が形成されている。そして、１対の挟持部材５３，５４を連結する際には、位置決めピン５８をピン穴５９に係合させて、一方の挟持部材５３，５４の他方に対する位置を容易に決めることができるようになっている。
【００４２】
さらに、図７、図１４に示すように、前後１対の挟持部材５３，５４の第１凹部５３ａ，５４ａの下端部の右側部分には、取付ビス４２の頭部が係合可能な凹部５３ｃ，５４ｃ（回転規制部）が夫々形成され、第１挟持部５１で針棒３０を挟持した状態では、取付ビス４２の頭部がこれら凹部５３ｃ，５４ｃに夫々係合して針取付具５０の針棒３０に対する回転が規制されることになる。
【００４３】
図３、図７、図１４に示すように、前後１対の挟持部材５３，５４を連結した状態では、第１挟持部５１の右側の部分と第２挟持部５２の左側の部分には、３本のビス５５〜５７を締め付ける際の締めしろとなる、僅かな隙間が夫々形成される。従って、第１挟持部５１と第２挟持部５２により、針棒３０とパンチング針１４とを夫々確実に挟持することができる。
【００４４】
次に、ミシンＭの作用について説明する。まず、針棒３０の下端部に設けられた針抱き３３にビス４０により目孔１３ａ付きの縫針１３を装着した状態（図８参照）では、通常縫製を行って針板１１上の加工布に縫目を形成することができる。即ち、針棒上下動機構３１により針棒３０を上下動させると、縫針１３の目孔１３ａから下方へ延びる上糸が、針板１１の下側に位置する釜機構１０の剣先により捕捉された状態で天秤３２により上方に引き上げられて、加工布に縫目が形成されていく。
【００４５】
一方、パンチング針１４により加工布８０にニードルパンチング加工を施す場合には、ビス４０を緩めて縫針１３を針抱き３３から外した後、ビス４０を締めておく。その後、通常縫製用の針板１１を取り外してニードルパンチング用の針板１２をベッド部１に取付ける。そして、互いに分離した針取付具５０の１対の挟持部材５３，５４により針棒３０とパンチング針１４の針保持部１４ｂを挟んだ状態で、３本のビス５５〜５７を締めて第１、第２挟持部５１，５２で針棒３０とパンチング針１４を夫々挟持して、パンチング針１４を針棒３０から左方に所定距離離隔した位置に取付ける。
【００４６】
そして、保護カバーホルダ４５を押え棒４４の下端部に連結した後に、毛糸８１を案内穴４８ｆと円形穴４８ｅに通した後、加工布８０の上に毛糸８１を重ねて戴置させる。この一連の作業が終了した後、押え上げレバー４９を操作して布押え４８を降ろし、布押え４８で加工布８０と毛糸８１とを押えた状態で、針棒上下動機構３１により針棒３０を上下動させる。
【００４７】
すると、図１２、図１３に示すように、パンチング針１４の複数の針本体部１４ａに形成された複数の引掛け爪１４ｃにより、毛糸８１の一部を引っ掛けつつ、複数の針本体部１４ａが加工布８０と毛糸８１とを貫通し、引掛け爪１４ｃに引っ掛けられた毛糸８１の一部が加工布８０に押し込まれて、加工布８０に装飾模様が形成される。このとき、パンチング針１４は、針棒３０から水平方向左方に所定距離離隔して位置しており、前述のニードルパンチング加工により生じる糸屑や布屑等の繊維屑は、針板１２の針穴１２ａを通ってベッド部１内に落下して、針板１２の下側に設けられたダストボックス１６に収容される。
【００４８】
以上説明したミシンＭによれば、次のような効果が得られる。
【００４９】
１）前後方向に装着された３本のビス５５〜５７を締結することにより第１、第２挟持部５１，５２で針棒３０とパンチング針１４とが夫々挟持されるので、針棒上下動機構３１による針棒３０の上下方向の駆動力が針抱き３３を針棒３０に固定するビス４０に直接作用せず、針棒３０を繰り返し上下動させてもビス４０のネジ部が破損したり又は劣化したりするのを防止できる。また、パンチング針１４を針取付具５０を介して針棒３０に装着するため、パンチング針１４の取付けの際に針抱き３３を針棒３０から取り外す必要がなく、取付け作業が容易になる。
【００５０】
２）第１、第２挟持部５１，５２を形成する前後１対の挟持部材５３，５４は、３本のビス５５〜５７の締結状態を解除した状態で、互いに前後に分離可能に構成されているので、１対の挟持部材５３，５４を前後に分離させた状態で、これら挟持部材５３，５４の間に針棒３０とパンチング針１４の針保持部１４ｂを前後から挟んで、３本のビス５５〜５７を締結することができるので、水平方向からパンチング針１４を針棒３０に取付けることができ、パンチング針１４の取付が容易になる。さらに、１対の挟持部材５３，５４を締結する締結部材として３本のビス５５〜５７を用いるので、ナットが不要になりパンチング針１４の取付がさらに容易になる。
【００５１】
３）前側の挟持部材５３に後方へ突出する位置決めピン５８が設けられ、後側の挟持部材５４にこの位置決めピン５８が係合可能なピン穴５９が形成されているので、１対の挟持部材５３，５４が分離状態にある状態で、位置決めピン５８をピン穴５９に係合させて位置決めできるため、一方の挟持部材５３，５４の他方に対する位置を容易に決めることができる。また、後側の挟持部材５４にピン穴５９が設けられているので、ミシンＭの前方に位置する作業者にとって位置決めピン５８をピン穴５９に係合させやすい。
【００５２】
４）針棒３０の下端部に固定された針抱き３３に縫針１３を装着した状態では、通常縫製を行って針板１１上の加工布に縫目を形成できるし、針取付具５０により針棒３０から水平方向左方へ所定距離離隔した位置にパンチング針１４を取付けた状態では、針板１２上の加工布８０にニードルパンチング加工を施すことができ、１台のミシンＭで通常縫製とニードルパンチング加工の両方の作業を行うことができる。
【００５３】
５）第１挟持部５１により針棒３０を挟持した状態では、１対の挟持部材５３，５４に形成された凹部５３ｃ，５４ｃに、針棒糸案内３４を針棒３０に固定する取付ビス４２の頭部が係合するので、簡単な構造で針取付具５０の針棒３０に対する回転を規制することができ、針取付具５０がさらに取り付けやすくなる。
【００５４】
６）針棒３０の径とパンチング針１４の針保持部１４ｂの小径部の径とが異なっており、これら針棒３０とパンチング針１４を挟持する第１、第２挟持部５１，５２の穴径も異なって形成されているため、作業者が針取付具５０の取付方向を間違えた場合でも容易に気づくことができる。
【００５５】
次に、前記実施の形態に種々の変更を加えた変更形態について説明する。但し、前記実施形態と同様のものについては、同じ符号を付して適宜その説明を省略する。
【００５６】
１］前記実施の形態では、通常縫製用の針板１１と、ニードルパンチング用の針板１２の２種類の針板１１，１２のうち、何れか一方を選択的にベッド部１に装着するように構成したが、縫針１３が通過する第１の針穴と、パンチング針１４が通過し第１の針穴より水平方向へ所定距離離隔した位置に形成された第２の針穴を有し、通常縫製を行う場合とニードルパンチング加工の場合との両方の場合で兼用可能な針板をベッド部１に装着してもよい。尚、この場合には、縫製作業に支障がない限り、縫針１３とパンチング針１４の両方を針棒３０に常時取付けておくこともできる。
２］３本のビス５５〜５７のネジ径を同じに構成してもよい。
【００５７】
３］図１５に示すように、針取付具５０Ａが、針棒３０を挟持可能な第１挟持部５１Ａを形成する１対の挟持部材５３Ａ，５４Ａを有し、針取付具５０Ａには、前後方向に３本のビス７０が装着され、右側の２本のビス７０の締結状態を解除した状態では、１対の挟持部材５３Ａ，５４Ａを互いに分離可能に構成してもよい。尚、この場合には、左側の第２挟持部５２Ａにおいては、最も左側に位置する１本のビス７０を締めることにより、パンチング針１４が挟持される。
【００５８】
４］図１６に示すように、針取付具５０Ｂの左右両端側部分に前後方向に２本のビス７１が装着され、右側のビス７１の締結状態を解除した状態では、第１挟持部５１Ｂを形成する１対の挟持部材５３Ｂ，５４Ｂのうち、前側の挟持部材５３Ｂが枢支軸７２を中心に平面視で時計回りに回動して、後側の挟持部材５４Ｂから離隔するように構成してもよい。尚、この場合には、左側の第２挟持部５２Ｂにおいては、左側のビス７１を締めることによりパンチング針１４が挟持される。このように構成した場合には、パンチング針１４を針棒３０から着脱する際に、特にパンチング針１４を針取付具５０Ｂから取り外す必要がない。
【００５９】
５］ニードルパンチング加工を行う際に、送り機構の送り歯をドロップして作業者が手動にて加工布８０を前後左右に移動するようにしてもよい。この場合、複数の開口部１２ｂは不要となる。また、布押え４８は加工布８０から僅かに離れた状態か、もしくは、パンチング針１４の上下動に合わせて上下動するように構成する。
【００６０】
６］ニードルパンチング加工用の装飾材としては、前記実施の形態の毛糸８１の他、綿、不織布、フェルト等、種々の材料を使用することができる。
【００６１】
７］引掛け爪１４ｃの形状や針本体部１４ａの本数等が異なる複数種類のパンチング針を予め準備しておき、被加工物である加工布や装飾材の種類によって複数種類のパンチング針のうち、最適な１種類のパンチング針を選択的に装着するように構成してもよい。
【００６２】
【発明の効果】
請求項１の発明によれば、針棒に針棒糸案内が取付部材により固定された状態では、針取付具に形成された回転規制部に取付部材が係合しているので、簡単な構造で針取付具の針棒に対する回転を規制することができ、針取付具をさらに取り付けやすくなる。
【００６３】
【００６４】
【００６５】
請求項２の発明によれば、１対の挟持部材の一方に他方側へ突出する位置決めピンが設けられ、他方に前記位置決めピンが係合可能なピン穴が形成されているので、１対の挟持部材が分離された状態で、１対の挟持部材の一方に設けられた位置決めピンを、他方に設けられたピン穴に係合させることができ、一方の挟持部材の他方に対する位置を決めることができ、１対の挟持部材を連結するのが容易になる。
【００６６】
【００６７】
【００６８】
請求項３の発明によれば、第２の挟持部により針保持部を挟持して針棒に第２の針を取付けた状態で、針棒を上下動させて複数の針本体部を加工布に貫通させることができる。
【００６９】
請求項４の発明によれば、針棒の径と針保持部の径とが異なるので、誤って針棒が第２の挟持部に挟持されたり、逆に、パンチング針が第１の挟持部に挟持されてしまうのを防止できる。
【００７０】
請求項５の発明によれば、針取付具により針棒から所定距離離れた位置に取付けられた第２の針の複数の針本体部を、針板上に重ねて戴置された２つの被加工物に貫通させて、下側の被加工物にニードルパンチング加工を施すことができる。即ち、針棒の真下の位置に第１の針を装着した状態では通常の縫製を行うことができるし、針棒から所定距離離れた位置に第２の針を装着した状態ではニードルパンチング加工を行うことができるため、１台のミシンで縫製とニードルパンチングの両方の作業を行うことができる。
【００７１】
【図面の簡単な説明】
【図１】本発明の実施形態に係るミシンの全体斜視図である。
【図２】ミシンの左側面図である。
【図３】ベッド部及びヘッド部の一部切欠斜視図である。
【図４】ベッド部及びヘッド部の要部正面図である。
【図５】通常縫製用の針板の裏面を示す図である。
【図６】ニードルパンチング加工用の針板の裏面を示す図である。
【図７】針棒、針抱き、針取付具の分解斜視図である。
【図８】縫針装着状態における針棒及び針抱きの斜視図である。
【図９】ニードルパンチング加工時におけるパンチング針及び布押えの斜視図である。
【図１０】パンチング針を示す図であり、（ａ）はパンチング針の正面図、（ｂ）はパンチング針を下方から見た図である。
【図１１】針本体部の一部拡大正面図である。
【図１２】ニードルパンチング加工時における針板付近の一部拡大断面図である。
【図１３】ニードルパンチング加工が施された加工布及び毛糸の断面図である。
【図１４】針取付具の分解平面図である。
【図１５】変更形態の針取付具の斜視図である。
【図１６】別の変更形態の針取付具の斜視図である。
【符号の説明】
Ｍミシン
１２針板
１２ａ針穴
１３縫針
１３ａ目孔
１４パンチング針
１４ａ針本体部
１４ｂ針保持部
１８ミシン機枠
３０針棒
３３針抱き
３４針棒糸案内
４２取付ビス
５０，５０Ａ，５０Ｂ針取付具
５１，５１Ａ，５１Ｂ第１挟持部
５２，５２Ａ，５２Ｂ第２挟持部
５３ｃ，５４ｃ凹部
５３，５３Ａ，５３Ｂ挟持部材
５４，５４Ａ，５４Ｂ挟持部材
５５，５６，５７ビス
５８位置決めピン
５９ピン穴
７０ビス
７１ビス
８０加工布 [0001]
BACKGROUND OF THE INVENTION
  The present inventionSewing machine that can attach multiple needles to the lower end of the needle barAbout.
[0002]
[Prior art]
  Conventionally, various types of sewing machines capable of attaching a plurality of needles to the lower end portion of the needle bar have been proposed. For example, in the sewing machine described in Patent Document 1, the lower end portion of the needle bar is provided. Two needle mounting holes are formed in the provided needle clamp at a position spaced apart by a predetermined distance in the horizontal direction, and two needles are fixed to the two needle mounting holes by screws mounted in the horizontal direction. . Further, in the two-needle sewing machine described in Patent Document 2, two needle clamps are respectively fixed to the lower end portion of the needle bar with screws mounted in the horizontal direction, and two needle clamps are respectively attached to these two needle clamps. The needle is secured with a mounting screw.
[0003]
[Patent Document 1]
  Japanese Utility Model Publication No. 53-68364 (first page, FIG. 1)
[Patent Document 2]
  JP-A-3-236895 (2nd page, FIG. 3)
[0004]
[Problems to be solved by the invention]
  However, in the sewing machine described in Patent Document 1, when the distance between the two needle mounting holes is large, the horizontal length of the needle clamp that is fixed to the lower end of the needle bar becomes long, and during sewing, The load on the sewing machine motor when the needle bar is moved up and down is increased.
[0005]
  On the other hand, in the sewing machine described in Patent Document 2, since the two needle clamps are directly fixed to the needle bar by two screws mounted in the horizontal direction, the driving force that moves the needle bar up and down during sewing is performed. Will repeatedly act on these two screws. In particular, when the distance between two needles is large, a large force repeatedly acts on the two screws, so that it is difficult to remove the needle clamp from the needle bar due to deterioration or breakage of the screw threads. There is a risk of becoming.
[0006]
  The purpose of the present invention is toProvided is a sewing machine that makes it easy to attach a needle mounting tool that supports a second needle to a needle bar, and can regulate the rotation of the needle mounting tool with respect to the needle bar with a simple structure.It is to be.
[0007]
[Means for Solving the Problems]
  The sewing machine according to claim 1 is a needle bar disposed on the sewing machine main body so as to be movable up and down, and a needle holder for fixing a first needle with a sewing eye hole to a lower end portion of the needle bar,A second needle positioned at a predetermined distance from the needle bar in a horizontal direction; a first clamping part capable of clamping the needle bar; and a second clamping part capable of clamping the second needle. A needle attachment for attaching the second needle to the needle bar, and a fastening member attached to the needle attachment so as to be capable of being fastened in a direction of sandwiching the needle bar and the second needle, Fastening member that clamps the needle bar and the second needle by the first and second clamping portions by fasteningIn a sewing machine withA needle bar thread guide for guiding a thread when the first needle is attached to the needle clamp and sewing, and an attachment member for fixing the needle bar thread guide to the needle bar; In the state where the rotation restricting portion engageable with the attachment member is formed and the needle bar is clamped by the first clamping portion, the attachment member engages with the rotation restricting portion and the needle of the needle fixture Restricting rotation with respect to the rodIt is comprised as follows.
[0008]
  In this sewing machine, a first needle with a sewing eye hole can be attached to the needle holder at the lower end of the needle bar, and the needle bar is moved up and down while the first needle is attached to the needle holder. An upper thread extending downward from the first needleEntangling the lower threadForm seams on the work cloth. Furthermore, the second needle can be attached to the needle bar at a position spaced apart from the needle bar by a predetermined distance in the horizontal direction with a needle fitting. Here, the fastening member is mounted in a direction to sandwich the needle bar and the second needle, and by fastening the fastening member, the needle bar is sandwiched by the first clamping part of the needle attachment, and the second The second needle is pinched by the pinching portion of, and the second needle is attached to the needle bar via the needle fitting.
  Further, when the needle bar thread guide is fixed to the needle bar by the mounting member, when the fastening member is fastened and the needle mounting tool is connected, the mounting member is engaged with the rotation restricting portion formed in the needle mounting tool. The rotation of the needle attachment relative to the needle bar is restricted.
[0009]
[0010]
[0011]
  Claim2The sewing machine claims1In the invention, one of the pair of clamping members is provided with a positioning pin protruding to the other side, and the other is formed with a pin hole into which the positioning pin can be engaged. When connecting a pair of holding members in a separated state, a positioning pin provided on one of the pair of holding members is engaged with a pin hole provided on the other, and the other holding member is connected to the other. After the position is determined, the fastening member is fastened.
[0012]
[0013]
[0014]
  Claim3The sewing machine according to claim 1.Or 2In the invention, the second needle has a plurality of needle main body portions and a needle holding portion that holds the plurality of needle main body portions and is held by the second holding portion. Therefore, the needle holding part is clamped by the second clamping part, and the second needle is attached to the needle bar via the needle mounting tool. In this state, the needle bar is moved up and down, and a plurality of needle body parts are processed. Penetrate things.
[0015]
  Claim4The sewing machine claims3In the invention, the diameter of the needle bar is different from the diameter of the needle holding portion. Therefore, the needle bar is not accidentally clamped by the second clamping unit, or the needle holding unit is not clamped by the first clamping unit.
[0016]
  Claim5The sewing machine claims3Or4In the invention, a plurality of hooking claws are formed on each of the plurality of needle body portions,Needle plateWith two workpieces placed one above the other, the second needle penetrates the two workpieces while hooking part of the upper workpiece with the plurality of hooking claws. Thus, needle punching is performed on the lower workpiece.
[0017]
  This sewing machine pushes a part of decoration materials such as wool and cotton placed on a work cloth, etc., into the work cloth from above with a second needle having a plurality of needle body parts. A so-called needle punching process in which an embroidered decorative pattern is applied to a cloth or the like is possible. That is, in a state where two workpieces made of a work cloth and a decoration material are placed one above the other on the needle plate, the second work piece is attached to a position away from the needle bar by a needle attachment. When the second needle is moved up and down, the plurality of hooking claws formed on the plurality of needle main bodies of the second needle hooks a part of the upper workpiece, and in this state, the second needle By penetrating the workpiece, a decorative pattern is applied to the lower workpiece.
[0018]
[0019]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described. In the present embodiment, the present invention is applied to a sewing machine capable of needle punching processing in which a woolen thread as a decorative material placed on a work cloth is pushed into the work cloth and an embroidered decorative pattern is applied to the work cloth. It is an example.
[0020]
  As shown in FIGS. 1 to 3, the sewing machine M includes a horizontal bed portion 1, a pedestal portion 2 erected at the right end of the bed portion 1, and a pedestal portion 2 parallel to the bed portion 1. An arm portion 3 extending to the left and a head portion 4 provided at the left end of the arm portion 3 are provided. In this sewing machine M, as indicated by a chain line in FIGS. 3 and 4, a sewing needle 13 (with a first needle attached to a sewing needle hole 13 a (see FIG. 8)) at the lower end of the needle bar 30 of the head portion 4. In the state where the corresponding) is mounted, normal sewing can be performed in which the upper thread and the lower thread are entangled to form a stitch on the work cloth placed on the bed portion 1.
[0021]
  On the other hand, as shown by a solid line in FIGS. 1 to 4, a punching needle 14 (also referred to as a felting needle, which corresponds to a second needle), which will be described later, is located at a predetermined distance from the needle bar 30 to the left in the horizontal direction. In the mounted state, as shown in FIGS. 12 and 13, the punching needle 14 is used to decorate the yarn 81 (upper side) as a decorative material superimposed on the work cloth 80 (lower workpiece) on the bed 1. The workpiece cloth 80 can be subjected to a needle punching process in which an embroidered decorative pattern is formed on the work cloth 80 without using an upper thread or a lower thread.
[0022]
  As shown in FIGS. 2 and 4, a hook mechanism 10 that catches the upper thread below the needle bar 30 when performing normal sewing using the sewing needle 13 is provided inside the bed portion 1.ButIn the bed portion 1, one of a needle plate 11 for normal sewing and a needle plate 12 for needle punching is mounted on the upper side of the shuttle mechanism 10. That is, as shown in FIGS. 5 and 6 (views of the needle plates 11 and 12 when viewed from the bed 1 side), the sewing machine M has a needle hole 11a that is located above the shuttle mechanism 10 and through which the sewing needle 13 passes. Two types of needle plates 11 and 12 are attached, which are a needle plate 11 provided and a needle plate 12 that is located to the left of the shuttle mechanism 10 and has a needle hole 12a through which a punching needle 14 passes. When performing sewing or needle punching, one of these two types of needle plates 11 and 12 is selected and attached to the bed portion 1.
[0023]
  As shown in FIGS. 1 to 4, a lid member 15 is detachably attached to the left end portion of the bed portion 1, the lid member 15 is opened and the bed portion 1 is opened, and there is no dust box 16 to be described later. In this state, the lower thread bobbin of the shuttle mechanism 10 can be exchanged. Further, when the needle plate 12 for needle punching is mounted on the bed 1, the needle hole 12 a is used when the needle punching process is performed with the punching needle 14 in the space between the lid member 15 and the shuttle mechanism 10. A dust box 16 for storing fiber waste such as yarn waste and cloth waste falling downward is attached to a holder portion 17 attached to the lower side of the needle plate 12 in a detachable manner. Further, the bed portion 1 is also provided with a feed mechanism (not shown) for moving the work cloth in the front-rear direction, and the two types of needle plates 11 and 12 are provided with feed teeth of the feed mechanism from the needle plates 11 and 12. A plurality of openings 11b and 12b are formed for making them appear and disappear.
[0024]
  The pedestal portion 2 is provided with a start / stop switch 20, a feed adjustment dial 21, a reverse stitching lever 22, a hand pulley 23, and the like, and the arm portion 3 is provided with a carrying handle 24.
[0025]
  As shown in FIGS. 2 to 4, the head portion 4 includes a needle bar 30 that is disposed on a sewing machine frame 18 as a sewing machine body, and a needle bar that drives the needle bar 30 up and down. A moving mechanism 31, a balance 32 that can be swung up and down in the sewing machine frame 18, a needle holder 33 for fixing the sewing needle 13 to the lower end portion of the needle bar 30, and a sewing needle 13 attached to the needle holder 33. Thus, a wire-like needle bar thread guide 34 for guiding the upper thread extending from the balance 32 to the eye hole 13a of the sewing needle 13 when performing normal sewing is provided. Further, the head unit 4 is also provided with a thread tensioner 35, a thread guide 36, and the like.
[0026]
  As shown in FIGS. 7 and 8, the needle holder 33 includes a screw 40 for attaching the sewing needle 13 to the needle holder 33 and a needle reverse attachment prevention plate 41 for preventing the sewing needle 13 from being attached in reverse. The needle holder 33 itself is also fixed to the needle bar 30 by a screw 40. A needle bar thread guide 34 is provided on the upper side of the needle clamp 33. The needle bar thread guide 34 is provided with an upper mounting portion 34a and a thread guide protruding in a curved shape horizontally from the lower end of the mounting portion 34a. The part 34b is integrally formed. The needle bar thread guide 34 is attached to the mounting screw 42 in a state where the thread guide 34b of the needle bar thread guide 34 holds the needle clamp 33.(Corresponds to mounting member)It is fixed to the needle bar 30 by. Therefore, even when the screw 40 for attaching the sewing needle 13 to the needle holder 33 is loosened, the needle holder 33 is held by the needle bar thread guide 34 and does not fall off the needle bar 30.
[0027]
  The needle bar up-and-down moving mechanism 31 transmits a driving force of a sewing machine motor (not shown) to the needle bar 30 to drive the needle bar 30 up and down, and since it is a known configuration, its description is omitted. When the needle bar 30 is driven up and down by the needle bar up-and-down moving mechanism 31 in a state where the sewing needle 13 is attached to the needle holder 33, the needle bar 30 from the eye hole 13a of the sewing needle 13 below the needle plate 11 for normal sewing. The upper thread extending downward is entangled with the lower thread by the sword tip of the shuttle mechanism 10, and a stitch is formed on the work cloth on the needle plate 11.
[0028]
  As shown in FIGS. 2 to 4, on the rear side of the needle bar 30, a presser bar 44 is disposed parallel to the needle bar 30 and movable up and down with respect to the sewing machine frame 18. A protective cover for preventing foreign matter from entering the lower end portion of the needle bar 30 and a protective cover holder provided with a cloth presser for pressing the work cloth can be attached to the lower end portion of 44. Here, as the protective cover holder, two types of protective cover holders are prepared in advance: a protective cover holder for normal sewing (not shown) and a protective cover holder 45 for needle punching. One of these two types of protective cover holders is selectively attached to the presser bar 44 when performing needle punching.
[0029]
  The protective cover (not shown) and the presser foot (not shown) attached to the normal sewing protective cover holder are used for a general sewing machine, and will not be described in detail. In the state where the protective cover holder is connected to the lower end portion of the presser bar 44, the presser foot for normal sewing is positioned directly below the needle bar 30, and near the needle hole 11a through which the sewing needle 13 passes by the presser foot. The work cloth is pressed down.
[0030]
  As shown in FIGS. 2 to 4, when needle punching is performed, a protective cover holder 45 for needle punching is connected to the lower end portion of the presser bar 44. A transparent synthetic resin protective cover 46 is attached to the protective cover holder 45, and the front of the needle bar 30 near the lower end is covered with the protective cover 46.
[0031]
  Further, a cloth presser 48 made of a transparent synthetic resin and having a substantially rectangular shape in plan view is attached to the left end portion of the protective cover holder 45 via a mounting bracket 47. As shown in FIG. 9, the presser foot 48 includes a presser portion 48 a that presses the work cloth 80 in the vicinity of the needle hole 12 a through which the punching needle 14 passes, and a front end portion, a left end portion, and a presser portion 48 a. The right end portion includes a front wall portion 48b, a left wall portion 48c, and a right wall portion 48d formed in a vertical wall shape extending upward from the presser portion 48a. A circular hole 48e through which the punching needle 14 passes is formed at the center of the presser part 48a.
[0032]
  Furthermore, a guide hole 48f for guiding the yarn 81 stacked on the work cloth 80 in the front-rear direction is also formed in the front wall portion 48b. Accordingly, the wool yarn 81 is guided backward by the guide hole 48f, and further passes from the upper side of the presser part 48a through the circular hole 48e to the lower side of the presser part 48a, and is placed on the work cloth 80. The Here, when the yarn 81 passes through the guide hole 48f, a force in the front-rear direction acts on the front wall portion 48b. The front wall portion 48b is integrated with the left wall portion 48c and the right wall portion 48d. Since it is formed, the front wall portion 48b is supported in the front-rear direction by the left wall portion 48c and the right wall portion 48d, and the front wall portion 48b is not damaged.
[0033]
  Here, as shown in FIGS. 2 to 4, a predetermined gap is formed between the protective cover 46 and the needle plate 12, and the lower end of the protective cover 46 comes into contact with the work cloth 80 and the wool yarn 81. The movement in the front-rear direction of the work cloth 80 and the woolen yarn 81 by the feeding mechanism is not hindered. Furthermore, since the front wall portion 48b is located in the gap between the protective cover 46 and the work cloth 80, foreign matter can be prevented from entering the needle drop position of the punching needle 14 by the protective cover 46 and the front wall portion 48b. it can. Further, since the protective cover 46 and the cloth presser 48 are made of a transparent synthetic resin, the operator can perform needle punching while confirming the state of the work cloth 80 and the wool 81 on the needle plate 12. .
[0034]
  As shown in FIGS. 2 and 3, the presser bar 44 is provided with a presser lift lever 49. When the work cloth 80 and the wool yarn 81 are replaced, the presser bar 44 is operated by operating the presser lift lever 49. The presser foot 48 can be moved up and down by moving up and down.
[0035]
  By the way, as described above, the sewing machine M performs normal sewing on the work cloth on the needle plate 11 with the sewing needle 13 with the eye holes 13a, and overlaps the yarn 81 on the work cloth 80 on the needle plate 12. The work cloth 80 is configured to be able to perform needle punching, and the sewing machine M includes a punching needle 14 for needle punching that is located a predetermined distance from the needle bar 30 to the left in the horizontal direction, and a needle bar. And a needle holder 50 for attaching the punching needle 14 to the needle bar 30. The needle holder 50 has a first clamping part 51 capable of clamping the punching needle 30 and a second clamping part 52 capable of clamping the punching needle 14.
[0036]
  As shown in FIGS. 10 and 11, the punching needle 14 includes a plurality of (for example, five) needle main body portions 14 a, a second holding portion 52 of the needle attachment 50 that holds the plurality of needle main body portions 14 a. Needle holding portion 14b sandwiched between the two. As shown in FIG. 11, a plurality of hooking claws 14c are formed on the plurality of needle main body portions 14a, respectively. Then, the needle bar 30 is driven up and down by the needle bar up-and-down moving mechanism 31 in a state where the yarn 81 is superposed on the work cloth 80 on the needle plate 12 and pressed from above by the cloth presser 48, and the needle bar 30 shown in FIG. When the punching needle 14 is moved up and down from the position indicated by the solid line to the position indicated by the chain line, a part of the wool yarn 81 is hooked by the plurality of hooking claws 14c as shown in FIGS. The plurality of needle main body portions 14 a are configured to pass through the work cloth 80 and the wool yarn 81 while being pushed in. The needle holding portion 14 b is composed of a small-diameter portion in the upper half and a large-diameter portion in the lower half, and the small-diameter portion is held by the second holding portion 52 of the needle attachment 50.
[0037]
  The punching needle 14 is attached via a needle attachment 50 at a position shifted from the needle bar 30 to the left by a predetermined distance, so that the thread waste falling into the bed portion 1 through the needle hole 12a by needle punching processing. Fiber waste such as cloth waste and cloth waste is accommodated in a dust box 16 mounted on the lower side of the needle plate 12 so that the fiber waste is not entangled with the shuttle mechanism 10.
[0038]
  As shown in FIG. 7 and FIG. 14, the needle attachment 50 is a pair of front and rear clamping members that are formed in a block shape extending horizontally to the left and right and that form first and second clamping portions 51 and 52 that are cylindrical holes. 53, 54. A pair of first concave portions 53a and 54a having a semicircular arc shape in plan view forming the first clamping portion 51 are formed on the right side portions of the pair of clamping members 53 and 54, respectively, while facing each other. A pair of second recesses 53b, 54b having a semicircular arc shape in plan view, which form the second clamping part 52, are formed on the left side portions of the clamping members 53, 54 so as to face each other.
[0039]
  Three screws 55 to 57 having different screw diameters are attached to the needle attachment 50 in the front-rear direction (the direction in which the needle bar 30 and the punching needle 14 are sandwiched). That is, three holes slightly larger than the screw diameters of the three screws 55 to 57 are formed in the front holding member 53, respectively, while the rear holding member 54 has three screws. Three holes each having a female thread that matches the thread diameter of 55 to 57 are formed. The three screws 55 to 57 are respectively inserted into the three holes of the front holding member 53 and can be screwed into the three holes of the rear holding member 54, respectively. In a state where the three screws 55 to 57 are loosened (a state where the fastening state is released), the pair of clamping members 53 and 54 are configured to be separable from each other. And it is comprised so that the needle bar 30 and the punching needle | hook 14 may be clamped by the 1st, 2nd clamping parts 51 and 52 by fastening the three screws 55-57. In addition, as shown in FIG. 3, the needle bar 30 is clamped by the first clamping unit 51 in a state where the pair of clamping members 53 and 54 are positioned in the vertical direction in contact with the upper end surface of the needle holder 33. The
[0040]
  By the way, the diameter of the small diameter part of the needle holding part 14b is formed smaller than the diameter of the needle bar 30, and accordingly, the hole diameter of the second holding part 52 is also the first holding part 51 as shown in FIG. It is formed smaller than the hole diameter. Therefore, when the needle attachment 50 is attached to the needle bar 30, even if the needle bar 30 is mistakenly held by the second recesses 53b and 54b forming the second holding part 52, the second holding part 52 having a small hole diameter. Then, since the needle bar 30 cannot be clamped, the operator immediately notices the mistake.
[0041]
  A positioning pin 58 that protrudes rearward is provided in a portion on the right side of the second recess 53b of the front holding member 53, while a pin hole in which the positioning pin 58 can be engaged is provided in the rear holding member 54. 59 is formed. When the pair of holding members 53 and 54 are connected, the positioning pin 58 is engaged with the pin hole 59 so that the position of the one holding member 53 and 54 with respect to the other can be easily determined. It has become.
[0042]
  Further, as shown in FIGS. 7 and 14, a recess 53 c to which the head of the mounting screw 42 can be engaged is formed on the right side of the lower end of the first recess 53 a, 54 a of the pair of front and rear clamping members 53, 54. , 54c (rotation restricting portions) are formed, and in the state where the needle bar 30 is clamped by the first clamping portion 51, the heads of the mounting screws 42 are engaged with the recesses 53c, 54c, respectively. The rotation with respect to the needle bar 30 is restricted.
[0043]
  As shown in FIGS. 3, 7, and 14, in a state where the pair of front and rear clamping members 53 and 54 are connected, the right part of the first clamping part 51 and the second clamping part52A slight gap is formed in the left part of each of the two screws, which serves as a tightening margin when the three screws 55 to 57 are tightened. Therefore, the needle bar 30 and the punching needle 14 can be reliably clamped by the first clamping part 51 and the second clamping part 52, respectively.
[0044]
  Next, the operation of the sewing machine M will be described. First, in a state where the sewing needle 13 with the eye hole 13a is attached to the needle holder 33 provided at the lower end portion of the needle bar 30 with the screw 40 (see FIG. 8), normal sewing is performed and the work cloth on the needle plate 11 is applied. Seams can be formed. That is, when the needle bar 30 is moved up and down by the needle bar vertical movement mechanism 31, the upper thread extending downward from the eye hole 13 a of the sewing needle 13 is captured by the sword tip of the shuttle mechanism 10 located below the needle plate 11. In this state, the work is pulled up by the balance 32, and stitches are formed on the work cloth.
[0045]
  On the other hand, when the punching needle 14 performs needle punching on the work cloth 80, the screw 40 is loosened to remove the sewing needle 13 from the needle holder 33, and then the screw 40 is tightened. Thereafter, the needle plate 11 for normal sewing is removed, and the needle plate 12 for needle punching is attached to the bed portion 1. And in the state which pinched the needle holding | maintenance part 14b of the needle bar 30 and the punching needle 14 with the pair of clamping members 53 and 54 of the needle attachment 50 separated from each other, the three screws 55 to 57 are tightened to the first, The needle bar 30 and the punching needle 14 are clamped by the second clamping parts 51 and 52, respectively, and the punching needle 14 is attached to a position separated from the needle bar 30 to the left by a predetermined distance.
[0046]
  After the protective cover holder 45 is connected to the lower end of the presser bar 44, the wool 81 is passed through the guide hole 48f and the circular hole 48e, and then the wool 81 is placed on the work cloth 80. After this series of operations is completed, the presser foot lifting lever 49 is operated to lower the presser foot 48. With the presser foot 48 pressing the work cloth 80 and the yarn 81, the needle bar 30 is moved by the needle bar up-and-down moving mechanism 31. Move up and down.
[0047]
  Then, as shown in FIG. 12 and FIG. 13, the plurality of needle main body portions 14 a are hooked by a plurality of hooking claws 14 c formed on the plurality of needle main body portions 14 a of the punching needle 14 while a part of the wool yarn 81 is hooked. A part of the wool yarn 81 penetrating the work cloth 80 and the wool yarn 81 and hooked on the hooking claw 14 c is pushed into the work cloth 80, and a decorative pattern is formed on the work cloth 80. At this time, the punching needle 14 is located at a predetermined distance from the needle bar 30 to the left in the horizontal direction, and fiber waste such as yarn waste and cloth waste generated by the needle punching process described above is the needle of the needle plate 12. It falls into the bed portion 1 through the hole 12a and is accommodated in a dust box 16 provided on the lower side of the needle plate 12.
[0048]
  According to the sewing machine M described above, the following effects can be obtained.
[0049]
  1) Since the needle bar 30 and the punching needle 14 are clamped by the first and second clamping parts 51 and 52 by fastening the three screws 55 to 57 mounted in the front-rear direction, the needle bar moves up and down. The driving force in the vertical direction of the needle bar 30 by the mechanism 31 does not directly act on the screw 40 that fixes the needle holder 33 to the needle bar 30, and the screw part of the screw 40 is damaged even if the needle bar 30 is repeatedly moved up and down. Or it can prevent deterioration. Further, since the punching needle 14 is attached to the needle bar 30 via the needle attachment 50, it is not necessary to remove the needle holder 33 from the needle bar 30 when the punching needle 14 is attached, and the attaching operation is facilitated.
[0050]
  2) The pair of front and rear clamping members 53 and 54 that form the first and second clamping portions 51 and 52 are configured to be separable from each other in the front and rear directions in a state where the fastening state of the three screws 55 to 57 is released. Therefore, with the pair of clamping members 53 and 54 separated forward and backward, the needle holding portion 14b of the needle bar 30 and the punching needle 14 is sandwiched between the clamping members 53 and 54 from the front and rear. Since the screws 55 to 57 can be fastened, the punching needle 14 can be attached to the needle bar 30 from the horizontal direction, and the punching needle 14 can be easily attached. Further, since the three screws 55 to 57 are used as the fastening members for fastening the pair of clamping members 53 and 54, nuts are not necessary, and the punching needle 14 can be attached more easily.
[0051]
  3) Since a positioning pin 58 projecting rearward is provided on the front clamping member 53, and a pin hole 59 in which the positioning pin 58 can be engaged is formed in the rear clamping member 54, a pair of clamping members Since the positioning pin 58 can be engaged with the pin hole 59 and positioned in a state where 53 and 54 are in the separated state, the position of one of the clamping members 53 and 54 with respect to the other can be easily determined. Moreover, since the pin hole 59 is provided in the rear clamping member 54, it is easy for the operator located in front of the sewing machine M to engage the positioning pin 58 with the pin hole 59.
[0052]
  4) In a state where the sewing needle 13 is attached to the needle clamp 33 fixed to the lower end portion of the needle bar 30, normal sewing can be performed to form a stitch on the work cloth on the needle plate 11, and the needle attachment 50 can In a state where the punching needle 14 is attached at a position spaced a predetermined distance from the bar 30 to the left in the horizontal direction, the work cloth 80 on the needle plate 12 can be subjected to needle punching, and normal sewing can be performed with one sewing machine M. Both operations of needle punching can be performed.
[0053]
  5) In a state where the needle bar 30 is clamped by the first clamping part 51, the mounting screw 42 for fixing the needle bar thread guide 34 to the needle bar 30 in the recesses 53c, 54c formed in the pair of clamping members 53, 54. Therefore, the rotation of the needle attachment 50 with respect to the needle bar 30 can be restricted with a simple structure, and the needle attachment 50 can be attached more easily.
[0054]
  6) The diameter of the needle bar 30 and the diameter of the small diameter part of the needle holding part 14b of the punching needle 14 are different, and the holes of the first and second clamping parts 51 and 52 that clamp the needle bar 30 and the punching needle 14 Since the diameters are also formed differently, even if the operator makes a mistake in the direction in which the needle attachment 50 is attached, it can be easily recognized.
[0055]
  Next, modified embodiments in which various modifications are made to the embodiment will be described. However, the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted as appropriate.
[0056]
  1] In the above-described embodiment, either one of the two types of needle plates 11 and 12 including the needle plate 11 for normal sewing and the needle plate 12 for needle punching is selectively attached to the bed portion 1. The first needle hole through which the sewing needle 13 passes, and the second needle hole formed at a position spaced apart from the first needle hole by a predetermined distance in the horizontal direction through which the sewing needle 13 passes, A needle plate that can be used both in the case of performing normal sewing and in the case of needle punching may be attached to the bed portion 1. In this case, both the sewing needle 13 and the punching needle 14 can be always attached to the needle bar 30 as long as the sewing operation is not hindered.
  2] The screw diameters of the three screws 55 to 57 may be the same.
[0057]
  3] As shown in FIG. 15, the needle attachment 50A has a pair of clamping members 53A and 54A forming a first clamping part 51A capable of clamping the needle bar 30, and the needle attachment 50A includes a front and rear In a state where the three screws 70 are attached in the direction and the right two screws 70 are released, the pair of clamping members 53A and 54A may be configured to be separable from each other. In this case, the punching needle 14 is clamped by tightening one screw 70 located on the leftmost side in the second clamping unit 52A on the left side.
[0058]
  4] As shown in FIG. 16, in the state where two screws 71 are attached to the left and right end portions of the needle fitting 50B in the front-rear direction and the right screw 71 is released, the first clamping portion 51B is Of the pair of sandwiching members 53B and 54B to be formed, the front sandwiching member 53B rotates clockwise about the pivot shaft 72 in plan view and is separated from the rear sandwiching member 54B. May be. In this case, the punching needle 14 is clamped by tightening the left screw 71 in the second clamping section 52B on the left side. In such a configuration, when the punching needle 14 is attached to and detached from the needle bar 30, it is not particularly necessary to remove the punching needle 14 from the needle attachment 50B.
[0059]
  5] When performing the needle punching process, the operator may manually move the work cloth 80 forward, backward, left, and right by dropping the feed dog of the feed mechanism. In this case, the plurality of openings 12b are not necessary. Further, the presser foot 48 is configured to move up and down in accordance with the vertical movement of the punching needle 14 in a state slightly separated from the work cloth 80.
[0060]
  6] As a decorative material for the needle punching process, various materials such as cotton, non-woven fabric, felt, etc. can be used in addition to the wool yarn 81 of the above embodiment.
[0061]
  7] Plural types of punching needles having different shapes of the hooking claws 14c, the number of the needle main body portions 14a, etc. are prepared in advance. Alternatively, an optimum one type of punching needle may be selectively mounted.
[0062]
【The invention's effect】
  According to the invention of claim 1,In a state where the needle bar thread guide is fixed to the needle bar by the mounting member, since the mounting member is engaged with the rotation restricting portion formed on the needle mounting tool, the rotation of the needle mounting tool with respect to the needle bar can be performed with a simple structure. This makes it easier to attach the needle fitting.
[0063]
[0064]
[0065]
  Claim2According to the invention, the positioning pin that protrudes to the other side is provided on one of the pair of clamping members, and the pin hole that can be engaged with the positioning pin is formed on the other side. In a separated state, a positioning pin provided on one of the pair of holding members can be engaged with a pin hole provided on the other, and the position of one holding member relative to the other can be determined. It becomes easy to connect a pair of clamping members.
[0066]
[0067]
[0068]
  Claim3According to this invention, in a state where the needle holding portion is clamped by the second clamping portion and the second needle is attached to the needle bar, the needle bar is moved up and down to penetrate the work cloth through the work cloth. be able to.
[0069]
  Claim4According to this invention, since the diameter of the needle bar is different from the diameter of the needle holding part, the needle bar is accidentally clamped by the second clamping part, or conversely, the punching needle is clamped by the first clamping part. Can be prevented.
[0070]
  Claim5According to the invention, the plurality of needle main body portions of the second needle attached at a position away from the needle bar by the needle attachment tool are placed on the two workpieces placed on the needle plate. The needle punching process can be performed on the lower workpiece by penetrating the workpiece. That is, normal sewing can be performed when the first needle is mounted at a position directly below the needle bar, and needle punching is performed when the second needle is mounted at a predetermined distance from the needle bar. Therefore, both sewing and needle punching operations can be performed with a single sewing machine.
[0071]
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a sewing machine according to an embodiment of the present invention.
FIG. 2 is a left side view of the sewing machine.
FIG. 3 is a partially cutaway perspective view of a bed portion and a head portion.
FIG. 4 is a front view of an essential part of a bed part and a head part.
FIG. 5 is a view showing a back surface of a needle plate for normal sewing.
FIG. 6 is a view showing the back surface of a needle plate for needle punching.
FIG. 7 is an exploded perspective view of a needle bar, a needle holder, and a needle fixture.
FIG. 8 is a perspective view of a needle bar and a needle clamp in a state where a sewing needle is mounted.
FIG. 9 is a perspective view of a punching needle and a cloth presser during needle punching.
10A and 10B are diagrams showing a punching needle, where FIG. 10A is a front view of the punching needle, and FIG. 10B is a view of the punching needle as viewed from below.
FIG. 11 is a partially enlarged front view of the needle main body.
FIG. 12 is a partially enlarged cross-sectional view of the vicinity of a needle plate during needle punching.
FIG. 13 is a cross-sectional view of a work cloth and wool yarn that has been subjected to needle punching.
FIG. 14 is an exploded plan view of the needle fixture.
FIG. 15 is a perspective view of a modified needle attachment.
FIG. 16 is a perspective view of another modification of the needle attachment.
[Explanation of symbols]
M sewing machine
12 Needle plate
12a Needle hole
13 Sewing needle
13a eye hole
14 punching needles
14a Needle body
14b Needle holder
18 Sewing machine frame
30 needle bar
33 Needle Dakimakura
34 Needle bar thread guide
42 mounting screws
50, 50A, 50B Needle fitting
51, 51A, 51B 1st clamping part
52, 52A, 52B 2nd clamping part
53c, 54c recess
53, 53A, 53B clamping member
54, 54A, 54B clamping member
55, 56, 57 screws
58 Locating pin
59 pin hole
70 screws
71 screw
80 processingcloth

Claims

A needle bar disposed on the main body of the sewing machine so as to be movable up and down, a needle holder for fixing a first needle with a sewing eye hole at the lower end of the needle bar, and a predetermined horizontal direction from the needle bar A second needle positioned at a distance; a first clamping part capable of clamping the needle bar; and a second clamping part capable of clamping the second needle; and the second needle as a needle bar A needle attachment for attachment, and a fastening member attached to the needle attachment so as to be capable of being fastened in a direction of sandwiching the needle bar and the second needle. In the sewing machine including the fastening member that clamps the needle bar and the second needle at the second clamping unit ,
A needle bar thread guide for guiding the thread when the first needle is attached to the needle clamp and sewing, and an attachment member for fixing the needle bar thread guide to the needle bar;
Forming a rotation restricting portion engageable with the attachment member on the needle attachment;
The sewing machine is configured such that in a state where the needle bar is clamped by the first clamping unit, the attachment member engages with the rotation regulating unit and regulates the rotation of the needle fixture relative to the needle bar .

The first positioning pins projecting to the other side is provided one on the pair of clamping members, the sewing machine according to claim 1, wherein the positioning pin to the other, characterized in that the engageable pin holes are formed.

Said second needle, according to claim 1 or 2, characterized in that it has a plurality of needle body portion, and a needle holding portion for holding a plurality of needle body portion and is clamped to said second clamping portion The sewing machine according to 1.

The sewing machine according to claim 3 , wherein a diameter of the needle bar is different from a diameter of the needle holding portion.

A plurality of hooking claws are formed on each of the plurality of needle main body portions, and the upper workpiece is processed by the plurality of hooking claws in a state where two workpieces are placed one above the other on the needle plate. by penetrating the second needle into the two workpieces while hooking a part of an object, according to claim 3 or 4, characterized by being configured to perform a needle punching below the workpiece Sewing machine.