JP2004329483A

JP2004329483A - Needle hole covering member for sewing machine, sewing machine having the member, and method of attaching the member

Info

Publication number: JP2004329483A
Application number: JP2003128066A
Authority: JP
Inventors: Masao Ogawa; 雅夫小川; Motohiro Komoda; 素弘菰田
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2003-05-06
Filing date: 2003-05-06
Publication date: 2004-11-25

Abstract

<P>PROBLEM TO BE SOLVED: To put a needle through a needle hole without interference with a throat plate when the needle is lowered by a simple constitution, and to prevent a material to be sewn on the throat plate from dropping into the needle hole. <P>SOLUTION: At the throat plate 12 of the sewing machine having the needle hole 12a which the needle body part 14a of a punching needle 14 can be put through, a sheet-shaped needle hole covering member 60 which covers the needle hole, which has a needle hole 60a having a hole diameter smaller than that of the needle hole 12a and which the needle body part 14a can be put through is detachably fitted. Thus, a cloth to be worked on the throat plate 12 is prevented from dropping downward through the needle hole 12a, and can smoothly be moved on the throat plate 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】本発明は、ミシン等に関し、特に、針が針板上の被加工物を貫通する際に被加工物が針穴に落ち込むのを防止可能な技術に関する。
【０００２】
【従来の技術】一般的なミシンにおいては、針を上下動させて針板の上に戴置された加工布等の被加工物を貫通させながら、この被加工物に刺繍的な模様を施したり縫目を形成したりする。そして、このように針が被加工物を貫通する際には、針の先端部は針板に形成された針穴に挿通される。
【０００３】
また、針板上の加工布等の上に戴置された毛糸や綿等の装飾材の一部を、複数の針を有するパンチング針により加工布等の中に押し込んで、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が可能なミシンも実用に供されているが、このようなミシンにおいても、パンチング針の複数の針は加工布や装飾材等を貫通してから針板の針穴に挿通されることになる。また、このようなニードルパンチング用のミシンの中には、加工布及び装飾材等を押える押え足に、パンチング針の複数の針が夫々貫通する複数の案内挿通孔が設けられたものもある（特許文献１参照）。
【０００４】
【特許文献１】登録実用新案第３０５０３３５号公報（第４−１１頁、図１）
【０００５】
【発明が解決しようとする課題】しかし、針板上に戴置された被加工物が、例えば、ジャージ用の生地などの非常に伸びやすい生地である場合には、被加工物に針を貫通させたときに、針の下降動作に伴って被加工物が部分的に針穴に落ち込んでしまい、次の針の下降動作までの間に針板上で被加工物をスムーズに送ることが難しい。また、針板の針穴を極力小さくして被加工物の落ち込みを防止することも考えられるが、針が針板に干渉しない正確な位置に穴径の小さな針穴を針板に形成するには高い加工精度が必要になり、製作コスト的に不利である。
【０００６】
また、特に、ニードルパンチング用ミシンにおいては、複数の針により装飾材を針板上の加工布に押し込むため、加工布がさらに針穴に落ち込みやすくなる。ここで、特許文献１のミシンのように、押え足に複数の案内挿通孔を設けることで、複数の針の下降動作に伴う針板上の加工布の落ち込みを多少は抑えられるかもしれないが、複数の針が下降して複数の案内挿通孔に挿通されるときに、複数の針が夫々押え足に干渉しないようにするために、押え足をミシンに取付ける際に高い取付精度が要求されるため、組み付けに手間がかかる。
本発明の目的は、簡単な構成により針の下降時に針が針板と干渉することなく針穴を挿通できるようにするとともに針板上の被縫製物が針穴に落ち込むのを防止することである。
【０００７】
【課題を解決するための手段】請求項１のミシンの針穴閉塞部材は、針が挿通可能な第１の針穴を有するミシンの針板に取り外し可能に取付けられて前記第１の針穴を塞ぐ薄板状の針穴閉塞部材であって、前記第１の針穴よりも穴径が小さく且つ針が挿通可能な１又は複数の第２の針穴を有するものである。
【０００８】
針板上に戴置された被加工物に対して刺繍的な模様を施したり、あるいは、被加工物に縫目を形成したりする場合には、針が上下動して被加工物を貫通することになる。ここで、針板には、針板の第１の針穴を閉塞する薄板状の針穴閉塞部材が取り外し可能に取付られているため、針板の第１の針穴が針穴閉塞部材により塞がれるとともに、針が被加工物を貫通する際には、針は針板の第１の針穴よりも穴径の小さい、針穴閉塞部材の第２の針穴を挿通することになり、被加工物が針穴から下方へ落ち込むのを極力防止できる。
【０００９】
請求項２のミシンの針穴閉塞部材は、請求項１の発明において、前記針よりも軟質の材料で構成されたものである。針が針板上の被加工物を貫通する際の振動や衝撃により、針が少し弾性変形して針穴閉塞部材に対する針落位置がわずかにずれてしまうことがあるが、このような場合でも、針穴閉塞部材が針よりも軟質の材料で構成されているために、針が針穴閉塞部材の第２の針穴を挿通するのが妨げられることがなく、針が破損してしまうこともない。
【００１０】
請求項３のミシンの針穴閉塞部材は、請求項１又は２の発明において、片面に粘着剤が塗布されているものである。この粘着剤により、針穴閉塞部材を容易に針板に取付けることができるし、針板からの取り外しも簡単である。
【００１１】
請求項４のミシンの針穴閉塞部材は、請求項１〜３の何れかの発明において、前記針板から取り外す為の穴部を有するものである。従って、この穴部に工具等を係合させることで、針穴閉塞部材を容易に針穴から取り外すことができる。
【００１２】
請求項５のミシンは、針とこの針が挿通可能な第１の針穴を有する針板とを備えたミシンにおいて、前記針板に取り外し可能に取付られて第１の針穴を塞ぐ薄板状の針穴閉塞部材であって、第１の針穴よりも穴径が小さく且つ針が挿通可能な１又は複数の第２の針穴を有する針穴閉塞部材を備えたものである。
【００１３】
針板上に戴置された被加工物に対して刺繍的な模様を施したり、あるいは、被加工物に縫目を形成したりする場合には、針が上下動して被加工物を貫通するが、ここで、針板には、針板の第１の針穴を閉塞する薄板状の針穴閉塞部材が取り外し可能に取付られているため、針板の第１の針穴が針穴閉塞部材により塞がれて、針は、針板の第１の針穴よりも穴径の小さい、針穴閉塞部材の第２の針穴を挿通することになり、被加工物が針穴から下方へ落ち込むのを極力防止できる。
【００１４】
請求項６の針穴閉塞部材の取付方法は、上下動可能な針とこの針が挿通可能な第１の針穴を有する針板とを備えたミシンに、前記第１の針穴を塞ぐ薄板状の針穴閉塞部材であって、第１の針穴よりも穴径が小さく且つ針が挿通可能な１又は複数の第２の針穴を有する針穴閉塞部材を取付ける針穴閉塞部材の取付方法であって、針が前記第１の針穴に挿通しない上限位置付近にある状態で針穴閉塞部材の第２の針穴に針を挿通させる挿通工程と、針が第２の針穴に挿通した状態で針の先端が第１の針穴を挿通するまで針を下降させる針下降工程と、針が第２の針穴に挿通した状態を維持しつつ針穴閉塞部材を針板に固着させて第１の針穴を塞ぐ固着工程とを備えたものである。
【００１５】
針穴閉塞部材は、針板の第１の針穴よりも穴径が小さく且つ針が挿通可能な１又は複数の第２の針穴を有し、第１の針穴を塞ぐために針板に取付られるものであり、請求項１と同様のものである。
この針穴閉塞部材の取付方法においては、まず、挿通工程において、針が針板の第１の針穴に挿通しない上限位置付近にある状態で、針穴閉塞部材を針の下端から上方へ移動させて、針を針穴閉塞部材の第２の針穴に挿通させる。次に、針下降工程において、針が第２の針穴に挿通した状態を保持しつつ、針の先端が第１の針穴を挿通するまで針を下降させる。そして、固着工程において、針が第２の針穴に挿通した状態を維持しつつ針穴閉塞部材を針板に固着させて、針穴閉塞部材により第１の針穴を塞ぐ。この取付方法により、針が第２の針穴に挿通した状態で、針穴閉塞部材を針板に取付ることができるため、針が針板上の被加工物を貫通する際に、針が確実に第２の針穴に挿通されて針が針板と干渉するのを防止できる。
【００１６】
【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、上糸と下糸とを用いて加工布に縫目を形成する通常縫製と、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、いわゆるニードルパンチング加工の両方が可能なミシンに本発明を適用した一例である。
【００１７】
図１〜図４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付きの縫針１３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。
【００１８】
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う）を装着した状態では、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の上に重ねた装飾材としての毛糸８１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。
【００１９】
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８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が挿通可能な針穴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が挿通可能な針穴１２ａ（第１の針穴）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。さらに、図７、図８に示すように、ニードルパンチング加工用の針板１２には、針板１２の針穴１２ａを塞ぐ本願特有の薄板状の針穴閉塞部材６０が取り外し可能に取付られている。この針穴閉塞部材６０については、後ほど詳述する。
【００２０】
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、図７、図８、図１３に示すように、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Ｄを収容するダストボックス１６が、針板１２の下側に取付られたホルダ部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、前述の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。
【００２１】
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。
【００２２】
図２〜図４に示すように、ヘッド部４には、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。
【００２３】
図９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。
【００２４】
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。
【００２５】
図１〜図４、図７、図８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。
【００２６】
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。
【００２７】
図２〜図４、図７、図８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。
【００２８】
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７、図８、図１０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が挿通する針穴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。
【００２９】
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。
【００３０】
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。
【００３１】
尚、図２〜図４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。
【００３２】
ところで、前述したように、ミシンＭは、目孔付きの縫針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。
【００３３】
図１１、図１２に示すように、パンチング針１４は、５本の針本体部１４ａと、これら５本の針本体部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１２に示すように、５本の針本体部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５本の針本体部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。
【００３４】
図９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。
【００３５】
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。
【００３６】
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。
【００３７】
さらに、図９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。
【００３８】
次に、本願特有の針穴閉塞部材６０について説明する。
図７、図８、図１３〜図１６に示すように、針穴閉塞部材６０は、ニードルパンチング加工用の針板１２の針穴１２ａを塞ぐ円形薄板状のものであり、この針穴閉塞部材６０は、針穴１２ａよりも穴径が小さく且つパンチング針１４の針本体部１４ａが夫々挿通可能な５つの針穴６０ａ（第２の針穴）を有する。
【００３９】
針穴閉塞部材６０は、鋼製の針本体部１４ａよりも軟質のアルミニウム合金製の薄板で構成されており、針穴閉塞部材６０の中央部に５つの針穴６０ａが形成されている。そして、針穴閉塞部材６０の下面には、この針穴閉塞部材６０を針板に固着する為の粘着剤が塗布されている。尚、針板１２への取付前には、針穴閉塞部材６０の下面は、はくり紙（図示略）で覆われている。また、針穴閉塞部材６０には、取り外し用の穴部６０ｂも形成されており、この穴部６０ｂにドライバー等の工具の先端部を係合させることにより、針板１２に粘着剤で固着された針穴閉塞部材６０を取り外すことができるようになっている。
【００４０】
この針穴閉塞部材６０により穴径の大きな針板１２の針穴１２ａが塞がれるため、ニードルパンチング加工中にパンチング針１４が下降する際に、針板１２上の加工布がパンチング針１４の下降動作に伴って針穴１２ａから針板１２の下側へ部分的に落ち込んでしまうのを防止できる。従って、加工布の送りをスムーズに行うことができ、加工布の同じ箇所に何度もニードルパンチング加工が施されてしまうこともない。
【００４１】
次に、この針穴閉塞部材６０を針板１２に取付ける取付方法について説明する。
まず、図１５に示すように、保護カバー４６、保護カバーホルダ４５、押え足４８を取り外した後、ハンドプーリ２３を回してパンチング針１４の針本体部１４ａを針板１２の針穴１２ａに挿通しない上限位置付近に移動させてから、針穴閉塞部材６０の下面を覆うはくり紙をはがし、この針穴閉塞部材６０を針本体部１４ａの下端側から上方へ移動させて、５本の針本体部１４ａを針穴閉塞部材６０の５つの針穴６０ａに挿通させる（挿通工程）。
【００４２】
次に、図１６に示すように、手で保持するなどして針穴閉塞部材６０が落下しないようにして、針本体部１４ａが針穴閉塞部材６０の針穴６０ａに挿通した状態を保持しつつ、ハンドプーリ２３を回して針本体部１４ａの先端が針板１２の針穴１２ａを挿通するまでパンチング針１４を下降させる（針下降工程）。
そして、針本体部１４ａが針穴６０ａに挿通した状態を維持しつつ、粘着剤により針穴閉塞部材６０を針板１２に固着させて、針穴閉塞部材６０により針板１２の針穴１２ａを塞ぐ（固着工程）。
【００４３】
この取付方法によれば、パンチング針１４の５本の針本体部１４ａが針穴閉塞部材６０の５つの針穴６０ａに挿通した状態で、針穴閉塞部材６０を針板１２に取付けることができるため、針穴閉塞部材６０を針板１２に取付けてからニードルパンチング加工を行う場合には、５本の針本体部１４ａが確実に５つの針穴６０ａに挿通することになる。
【００４４】
次に、ミシンＭの作用について説明する。まず、図３、図４の鎖線で示すように、針棒３０の下端部に設けられた針抱き３３にビス４０により目孔付きの縫針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、パンチング針１４が釜機構１０から左方へずれた位置で上下動して、図１３に示すように、パンチング針１４の５本の針本体部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、５本の針本体部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。
【００４８】
ここで、針板１２には針穴１２ａを塞ぐ針穴閉塞部材６０が取付けられており、前述のニードルパンチング加工の際には、パンチング針１４の５本の針本体部１４ａが、針穴１２ａよりも穴径の小さい、針穴閉塞部材６０の５つの針穴６０ａに挿通される。このように、針穴閉塞部材６０により穴径の大きな針板１２の針穴１２ａが塞がれるため、針板１２上の加工布８０がパンチング針１４の下降動作に伴って針穴１２ａから針板１２の下側へ部分的に落ち込むのを防止できる。
【００４９】
以上説明したミシンＭ及び針穴閉塞部材６０によれは、次のような効果が得られる。
１）針板１２の針穴１２ａが針穴閉塞部材６０により塞がれており、ニードルパンチング加工中にパンチング針１４が下降する際には、パンチング針１４の５本の針本体部１４ａは、針板１２の針穴１２ａよりも小さな針穴閉塞部材６０の５つの針穴６０ａを挿通する。従って、針板１２上の加工布８０がパンチング針１４の下降動作に伴って針穴１２ａから針板１２の下側へ部分的に落ち込んでしまうのを防止できる。そのため、送り機構による加工布８０の送りをスムーズに行うことができ、加工布８０の同じ箇所に何度もニードルパンチング加工が施されてしまうこともない。
【００５０】
また、針板１２の針穴１２ａの穴径は多少大きくても支障はないため、針板１２に針穴１２ａを形成する際の加工精度はそれほど厳しくなくてよく、製作コスト的に有利である。さらに、針穴閉塞部材６０は針板１２に取り外し可能に取付けられるため、使用されるパンチング針１４の種類に応じて適切な形状の針穴閉塞部材６０を取付けることができる。
【００５１】
２）針穴閉塞部材６０がパンチング針１４の針本体部１４ａよりも軟質の材料で構成されているので、ニードルパンチング加工中の振動や衝撃により、パンチング針１４の針本体部１４ａが少し弾性変形して針落位置がわずかにずれてしまう場合でも、針本体部１４ａが５つの針穴６０ａを挿通するのが妨げられず、針本体部１４ａが破損することもない。
【００５２】
３）針穴閉塞部材６０の片面に粘着剤が塗布されているので、この粘着剤により、針穴閉塞部材６０を容易に取付けることができるし、針穴閉塞部材６０の針板１２からの取り外しも容易である。
４）針穴閉塞部材６０には、針板１２から取り外す為の穴部６０ｂが設けられているので、この穴部６０ｂにドライバー等の工具を係合させて、針穴閉塞部材６０を容易に針板１２から取り外すことができる。
【００５３】
５）針穴閉塞部材６０を針板１２に取付ける際には、パンチング針１４の５本の針本体部１４ａが針穴閉塞部材６０の５つの針穴６０ａに挿通した状態で、針穴閉塞部材６０を針板１２に取付けることができるため、針穴閉塞部材６０を針板１２に取付けてからニードルパンチング加工を行う場合に、５本の針本体部１４ａを確実に５つの針穴６０ａに挿通させることができ、針本体部１４ａが針板１２と干渉するのを防止できる。また、針穴閉塞部材６０を針板１２に取付ける際に高い取付精度が要求されず、製作コスト的に有利であるし、作業者が自由に針穴閉塞部材６０を針板１２に取付けることも容易になる。
【００５４】
次に、前記実施形態に種々の変更を加えた変更形態について説明する。
１］針穴閉塞部材６０としては、前記実施形態のアルミニウム合金製の他、種々の材質のものを使用できるが、銅製、合成樹脂製、あるいは、合成ゴム製等、パンチング針１４の針本体部１４ａよりも軟質の材料で構成されていることが望ましい。尚、可撓性の合成樹脂や合成ゴム等の材料で針穴閉塞部材６０を構成した場合には、作業者が手で針穴閉塞部材６０を針板１２から剥がすことは容易であるため、取り外し用の穴部６０ｂを省略してもよい。
【００５５】
２］前記実施形態では、針穴閉塞部材６０の下面に塗布された粘着剤により針穴閉塞部材６０を針板１２に固着するように構成されているが、針穴閉塞部材６０を磁石で構成して、その磁力により針板１２に固着するようにしてもよい。
【００５６】
３］針穴閉塞部材は、前記実施形態のニードルパンチング用のミシンに限らず、縫針を用いて加工布に直線縫目を形成する一般的なミシンにも取付けることができ、この場合には、針穴閉塞部材には１つの針穴が設けられることになる。また、縫針を装着した針棒を前後に揺動させてジグザグ縫目を形成する、いわゆるジグザグミシンに本発明を適用し、針板に形成された左右に長いジグザグ縫目用の針穴を、小さな針穴を有する針穴閉塞部材で閉塞するように構成し、直線縫い用として用いてもよい。
【００５７】
【発明の効果】請求項１の発明によれば、針板に、第１の針穴を閉塞する薄板状の針穴閉塞部材が取り外し可能に取付けられているため、針板の第１の針穴が針穴閉塞部材により塞がれて、針は、針板の第１の針穴よりも穴径の小さい、針穴閉塞部材の第２の針穴を挿通することになる。従って、針板上の被加工物が針穴から下方へ落ち込むのを極力防止でき、針板上で被加工物をスムーズに移動させることができる。また、第１の針穴の穴径は多少大きくてもよいため、針板に第１の針穴を形成する際の加工精度はそれほど厳しくなくてよく、製作コスト的に有利である。さらに、この針穴閉塞部材は針板に取り外し可能に取付けられるため、使用される針の種類に応じて適切な形状の針穴閉塞部材を取付けることができる。
【００５８】
請求項２の発明によれば、針穴閉塞部材が針よりも軟質の材料で構成されているので、針が針板上の被加工物を貫通する際の振動や衝撃等により、針が少し弾性変形して針穴閉塞部材に対する針落位置がわずかにずれる場合でも、針が第２の針穴を挿通するのが妨げられず、針が破損することもない。
【００５９】
請求項３の発明によれば、針穴閉塞部材の片面に粘着剤が塗布されているので、この粘着剤により、針穴閉塞部材を針板に容易に取付けることができるし、針穴閉塞部材の針板からの取り外しも簡単である。
請求項４の発明によれば、針穴閉塞部材は、針板から取り外す為の穴部を有するので、この穴部に工具等を係合させて、針穴閉塞部材を容易に針板から取り外すことができる。
【００６０】
請求項５の発明によれば、請求項１と略同様の効果が得られるため、その説明を省略する。
請求項６の発明によれば、このような簡単な取付方法により、針が第２の針穴に挿通した状態を維持しながら容易に針穴閉塞部材を針板に取付けることができ、針が針板上の被加工物を貫通する際には針が確実に第２の針穴に挿通されることになるため、針が針板と干渉するのを防止できる。また、針穴閉塞部材を針板に取付ける際に高い取付精度が要求されず、取付が容易であるし、作業者が自由に針穴閉塞部材を針板に取付けることも容易になる。
【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平面図である。
【図６】ニードルパンチング加工用の針板の平面図である。
【図７】ベッド部及びヘッド部（パンチング針上限位置）の要部斜視図である。
【図８】ベッド部及びヘッド部（パンチング針下限位置）の要部斜視図である。
【図９】針棒、針抱き、針取付具の分解斜視図である。
【図１０】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１１】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１２】針本体部の一部拡大正面図である。
【図１３】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１４】針穴閉塞部材の平面図である。
【図１５】挿通工程におけるベッド部及びヘッド部の要部斜視図である。
【図１６】針下降工程におけるベッド部及びヘッド部の要部斜視図である。
【符号の説明】
Ｍミシン
１２針板
１２ａ針穴
１４パンチング針
１４ａ針本体部
６０針穴閉塞部材
６０ａ針穴
６０ｂ穴部[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine and the like, and more particularly to a technique capable of preventing a workpiece from dropping into a needle hole when a needle passes through the workpiece on a needle plate.
[0002]
2. Description of the Related Art In a general sewing machine, an embroidery pattern is formed on a workpiece by moving a needle up and down to penetrate a workpiece such as a work cloth placed on a needle plate. Or form seams. When the needle penetrates the workpiece in this way, the tip of the needle is inserted into the needle hole formed in the needle plate.
[0003]
In addition, a part of decorative material such as wool or cotton placed on the work cloth on the needle plate is pushed into the work cloth by a punching needle having a plurality of needles, and embroidered on the work cloth. A sewing machine capable of so-called needle punching, which provides a decorative pattern, is also in practical use. However, even in such a sewing machine, a plurality of punching needles need to be penetrated through a work cloth, a decorative material, or the like. It will be inserted through the needle hole of the board. Further, among such needle punching sewing machines, there is a sewing machine in which a plurality of guide insertion holes through which a plurality of punching needles are respectively provided are provided on a presser foot for holding a work cloth, a decorative material, and the like ( Patent Document 1).
[0004]
[Patent Document 1] Registered Utility Model No. 3050335 (page 4-11, FIG. 1)
[0005]
However, when the workpiece placed on the needle plate is a very stretchable fabric such as a jersey fabric, the needle penetrates the workpiece. When the needle is lowered, the workpiece is partially dropped into the needle hole with the lowering operation of the needle, and it is difficult to smoothly feed the workpiece on the needle plate until the next needle lowering operation. . It is also conceivable to reduce the needle hole of the needle plate as much as possible to prevent the workpiece from dropping. However, it is necessary to form a small needle hole in the needle plate at a precise position where the needle does not interfere with the needle plate. Requires high processing accuracy, which is disadvantageous in terms of manufacturing cost.
[0006]
Particularly, in a needle punching sewing machine, since the decorative material is pressed into the work cloth on the needle plate by a plurality of needles, the work cloth is more likely to fall into the needle hole. Here, as in the case of the sewing machine of Patent Literature 1, by providing a plurality of guide insertion holes in the presser foot, it may be possible to somewhat suppress the drop of the work cloth on the needle plate due to the lowering operation of the plurality of needles. In order to prevent the plurality of needles from interfering with the presser foot when the plurality of needles are lowered and inserted into the plurality of guide insertion holes, high mounting accuracy is required when mounting the presser foot to the sewing machine. Therefore, it takes time to assemble.
An object of the present invention is to enable a needle to be inserted through a needle hole without lowering the needle plate when the needle is lowered by a simple configuration and to prevent a sewing object on the needle plate from dropping into the needle hole. is there.
[0007]
The needle hole closing member of the sewing machine according to claim 1 is removably attached to a needle plate of the sewing machine having a first needle hole through which a needle can be inserted. Is a thin plate-shaped needle hole closing member that has a hole diameter smaller than that of the first needle hole and has one or a plurality of second needle holes through which a needle can be inserted.
[0008]
When applying an embroidery pattern to the work placed on the needle plate or forming a stitch on the work, the needle moves up and down to penetrate the work Will do. Here, since the thin plate-shaped needle hole closing member that closes the first needle hole of the needle plate is detachably attached to the needle plate, the first needle hole of the needle plate is closed by the needle hole closing member. When the needle is closed and the needle penetrates the workpiece, the needle passes through the second needle hole of the needle hole closing member having a smaller hole diameter than the first needle hole of the needle plate. Further, it is possible to prevent the workpiece from falling down from the needle hole as much as possible.
[0009]
The needle hole closing member of the sewing machine according to the second aspect is the invention according to the first aspect, wherein the needle hole closing member is made of a material softer than the needle. Due to vibration and impact when the needle penetrates the workpiece on the needle plate, the needle may be slightly elastically deformed and the needle drop position with respect to the needle hole closing member may slightly shift, but even in such a case, Since the needle hole closing member is made of a softer material than the needle, the needle is not hindered from passing through the second needle hole of the needle hole closing member, and the needle is broken. Nor.
[0010]
The needle hole closing member of the sewing machine according to the third aspect is the sewing machine according to the first or second aspect, wherein an adhesive is applied to one surface. With this adhesive, the needle hole closing member can be easily attached to the needle plate, and can be easily removed from the needle plate.
[0011]
A needle hole closing member of a sewing machine according to a fourth aspect of the present invention is the sewing machine according to any one of the first to third aspects, having a hole portion for removing the needle hole from the needle plate. Therefore, by engaging a tool or the like with this hole, the needle hole closing member can be easily removed from the needle hole.
[0012]
6. The sewing machine according to claim 5, wherein the sewing machine comprises a needle and a needle plate having a first needle hole through which the needle can be inserted. The sewing machine is detachably attached to the needle plate to close the first needle hole. A needle hole closing member having a hole diameter smaller than that of the first needle hole and having one or a plurality of second needle holes through which a needle can be inserted.
[0013]
When applying an embroidery pattern to the work placed on the needle plate or forming a stitch on the work, the needle moves up and down to penetrate the work However, here, since the thin plate-shaped needle hole closing member for closing the first needle hole of the needle plate is detachably attached to the needle plate, the first needle hole of the needle plate is connected to the needle hole. The needle is closed by the closing member, and the needle passes through the second needle hole of the needle hole closing member having a smaller hole diameter than the first needle hole of the needle plate, and the workpiece is removed from the needle hole. It can be prevented from falling downward as much as possible.
[0014]
7. A method of attaching a needle hole closing member according to claim 6, wherein the sewing machine includes a needle that can move up and down and a needle plate having a first needle hole through which the needle can be inserted. A needle-hole closing member for mounting a needle-hole closing member having a hole diameter smaller than that of the first needle hole and having one or a plurality of second needle holes through which a needle can be inserted. A method of inserting a needle through the second needle hole of the needle hole closing member in a state where the needle is near the upper limit position where the needle is not inserted through the first needle hole, and inserting the needle into the second needle hole. A needle lowering step of lowering the needle until the tip of the needle passes through the first needle hole with the needle inserted, and fixing the needle hole closing member to the needle plate while maintaining the state where the needle is inserted through the second needle hole And a fixing step of closing the first needle hole.
[0015]
The needle hole closing member has one or a plurality of second needle holes having a smaller hole diameter than the first needle hole of the needle plate and through which a needle can be inserted. It is attached, and is similar to claim 1.
In this method of attaching the needle hole closing member, first, in the insertion step, the needle hole closing member is moved upward from the lower end of the needle in a state where the needle is near the upper limit position where the needle is not inserted into the first needle hole of the needle plate. Then, the needle is inserted through the second needle hole of the needle hole closing member. Next, in the needle descending step, the needle is lowered while the state in which the needle is inserted through the second needle hole is maintained until the tip of the needle is inserted through the first needle hole. Then, in the fixing step, the needle hole closing member is fixed to the needle plate while maintaining the state in which the needle is inserted through the second needle hole, and the first needle hole is closed by the needle hole closing member. With this mounting method, the needle hole closing member can be mounted on the needle plate while the needle is inserted through the second needle hole. Therefore, when the needle penetrates the workpiece on the needle plate, the needle is The needle is reliably inserted into the second needle hole, and it is possible to prevent the needle from interfering with the needle plate.
[0016]
Embodiments of the present invention will be described. The present embodiment includes a normal sewing in which a seam is formed on a work cloth using an upper thread and a lower thread, and a wool as a decorative material placed on the work cloth by being superimposed on the work cloth. This is an example in which the present invention is applied to a sewing machine capable of performing both a so-called needle punching process in which an embroidery decorative pattern is applied to a sewing machine.
[0017]
As shown in FIGS. 1 to 4, the sewing machine M includes a horizontal bed 1, a pillar 2 erected at the right end of the bed 1, and a pillar 2 parallel to the bed 1. An arm 3 extending to the left and a head 4 provided at the left end of the arm 3 are provided. In the sewing machine M, as shown by a chain line in FIGS. 3 and 4, when the sewing needle 13 having an eye for sewing is attached to the lower end of the needle bar 30 of the head unit 4, the upper thread and the lower thread are attached. Ordinary sewing can be performed to form stitches on the work cloth placed on the bed portion 1 by being entangled.
[0018]
On the other hand, as shown by a solid line in FIGS. 1 to 4, in a state where a punching needle 14 (also referred to as a felting needle) described later is mounted at a position spaced a predetermined distance horizontally left from the needle bar 30, FIG. As shown in the drawing, the wool 81 as a decorative material superimposed on the work cloth 80 on the bed 1 is pushed into the work cloth 80 by the punching needle 14, and embroidered on the work cloth 80 without using the upper thread and the lower thread. Needle punching processing for forming a decorative pattern can be applied to the work cloth 80.
[0019]
As shown in FIGS. 2 and 4, a shuttle 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. In the part 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 to 8, the sewing machine M includes a needle plate 11 having a needle hole 11 a located above the shuttle mechanism 10 and through which the sewing needle 13 can be inserted. And a needle plate 12 having a needle hole 12a (first needle hole) through which a punching needle 14 can be inserted, and two types of needle plates 11 and 12 are attached, and normal sewing or needle punching is performed. In this case, one of these two types of needle plates 11 and 12 is selected and mounted on the bed 1. Further, as shown in FIGS. 7 and 8, a thin plate-shaped needle hole closing member 60 unique to the present invention for closing the needle hole 12a of the needle plate 12 is detachably attached to the needle plate 12 for needle punching. I have. The needle hole closing member 60 will be described later in detail.
[0020]
As shown in FIGS. 1 to 4, a lid member 15 is attached to the left end portion of the bed portion 1 so as to be openable and closable, and the bed portion 1 is opened by opening the lid member 15 and there is no dust box 16 described later. In this state, the lower thread bobbin of the shuttle mechanism 10 can be replaced. Further, as shown in FIGS. 7, 8 and 13, when the needle plate 12 for needle punching is mounted on the bed 1, the punching is performed in the space between the lid member 15 and the shuttle mechanism 10. A dust box 16 containing fiber waste D such as thread waste and cloth waste falling downward from the needle hole 12a when performing needle punching with the needle 14 is detachable from a holder portion 17 attached to the lower side of the needle plate 12. Attached to. Further, the bed unit 1 is also provided with a feed mechanism (not shown) for moving the work cloth in the front-rear direction. The above-mentioned two types of needle plates 11 and 12 are provided with feed teeth of the feed mechanism on the needle plates 11 and 12. A plurality of openings 11b and 12b for projecting and retracting from 12 are respectively formed.
[0021]
The pillar 2 is provided with a start / stop switch 20, a feed adjusting dial 21, a reverse stitch lever 22, a hand pulley 23, and the like, and the arm 3 is provided with a carrying handle 24.
[0022]
As shown in FIGS. 2 to 4, the head unit 4 includes a needle bar 30 disposed on the sewing machine frame 18 so as to be vertically movable, and a needle bar vertical movement mechanism 31 that drives the needle bar 30 up and down. A balance 32 arranged on the sewing machine frame 18 so as to be swingable up and down, a needle holder 33 for fixing the sewing needle 13 to the lower end of the needle bar 30, and a sewing needle 13 mounted on the needle holder 33 for normal sewing. And a wire-shaped needle bar thread guide 34 for guiding the upper thread extending from the balance 32 to the eye hole of the sewing needle 13 when performing the operation. Further, the head unit 4 is also provided with a thread tensioner 35, a thread guide 36, and the like.
[0023]
As shown in FIG. 9, the needle holder 33 is provided with 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 mounted in reverse. The needle holder 33 itself is also fixed to the needle bar 30 by the screw 40. A needle bar thread guide 34 is provided above the needle holder 33. The needle bar thread guide 34 is provided with an upper mounting portion 34a and a thread guide that protrudes horizontally in a curved shape from the lower end of the mounting portion 34a. The part 34b is integrally formed. The needle bar thread guide 34 is fixed to the needle bar 30 by mounting screws 42 with the thread guide portion 34b of the needle bar thread guide 34 holding the needle holder 33. 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 so as not to fall off the needle bar 30.
[0024]
The needle bar up-down movement mechanism 31 transmits the driving force of a sewing machine motor (not shown) to the needle bar 30 to drive the needle bar 30 up and down. When the needle bar 30 is driven up and down by the needle bar up and down movement mechanism 31 in a state where the sewing needle 13 is mounted on the needle holder 33, the needle bar 13 is moved 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 blade point of the shuttle mechanism 10 to form a stitch on the work cloth on the needle plate 11.
[0025]
As shown in FIGS. 1 to 4, 7, and 8, a presser bar 44 is provided on the rear side of the needle bar 30 so as to be parallel to the needle bar 30 and movable up and down with respect to the sewing machine frame 18. At the lower end of the presser bar 44, a protective cover for preventing foreign substances from entering the lower end of the needle bar 30 and a protective cover holder to which a cloth presser for holding a work cloth can be attached can be attached. It is. Here, as the protective cover holder, two types of protective cover holders, a protective cover holder for normal sewing (not shown) and a protective cover holder 45 for needle punching, are prepared in advance, and are usually sewn on a work cloth. When the needle punching process is performed, one of these two types of protective cover holders is selectively attached to the holding rod 44.
[0026]
The protective cover (not shown) and the cloth presser (not shown) attached to the protective cover holder for normal sewing are used for a general sewing machine, and therefore, detailed description thereof is omitted, but the protective cover for normal sewing is omitted. When the protective cover holder is connected to the lower end of the presser bar 44, the presser foot for normal sewing is located immediately below the needle bar 30, and the presser foot is located near the needle hole 11a through which the sewing needle 13 passes. The work cloth is pressed.
[0027]
As shown in FIGS. 2 to 4, 7, and 8, when performing needle punching, a protective cover holder 45 for needle punching is connected to the lower end of the holding rod 44. A transparent synthetic resin protective cover 46 is attached to the protective cover holder 45, and the protective cover 46 covers the front of the needle bar 30 near the lower end.
[0028]
Furthermore, a transparent synthetic resin presser 48 having a substantially rectangular shape in a plan view is attached to a left end portion of the protective cover holder 45 via a mounting bracket 47. As shown in FIG. 7, FIG. 8, and FIG. 10, the cloth presser 48 includes a presser portion 48a formed in a planar shape and pressing the work cloth 80 near the needle hole 12a through which the punching needle 14 is inserted, and a front end of the presser portion 48a. 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 pressing portion 48a at the left, right, and right ends, respectively. A circular hole 48e through which the punching needle 14 passes is formed in the center of the holding portion 48a.
[0029]
Further, the front wall portion 48b is also provided with a guide hole 48f for guiding the yarn 81 superimposed on the work cloth 80 in the front-rear direction. Accordingly, the wool 81 is guided rearward by the guide holes 48f, and further passes through the circular holes 48e from the upper side of the presser portion 48a to the lower side of the presser portion 48a, and is stacked on the work cloth 80. You.
[0030]
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 or the wool 81. The movement of the work cloth 80 and the yarn 81 by the feed mechanism in the front-rear direction is not hindered. Further, since the front wall portion 48b is located in the gap between the protective cover 46 and the work cloth 80, the protection cover 46 and the front wall portion 48b prevent foreign matter from entering the needle drop position of the punching needle 14 from outside. it can. Further, since the protective cover 46 and the cloth holder 48 are made of a transparent synthetic resin, the operator can perform the needle punching while checking the state of the work cloth 80 and the wool 81 on the needle plate 12. .
[0031]
As shown in FIGS. 2 to 4, the presser bar 44 is provided with a presser lifting lever 49, and when replacing the work cloth 80 and the yarn 81, the presser bar 44 is operated by operating the presser lever 49. The presser foot 48 can be moved up and down by moving it up and down.
[0032]
By the way, as described above, the sewing machine M performs ordinary sewing on the work cloth on the needle plate 11 with the sewing needle 13 having the eye, and also superimposes the wool 81 on the work cloth 80 on the needle plate 12. The sewing machine M includes a punching needle 14 for needle punching, which is located at a predetermined distance to the left in the horizontal direction from the needle bar 30, and a needle bar 30. And a needle holder 50 for attaching the punching needle 14 to the needle bar 30 and having a first holding part 51 capable of holding the punching needle 14 and a second holding part 52 capable of holding the punching needle 14.
[0033]
As shown in FIGS. 11 and 12, the punching needle 14 holds five needle main bodies 14 a, holds the five needle main bodies 14 a, and is nipped by the second nipping part 52 of the needle attachment 50. A needle holding portion 14b. As shown in FIG. 12, a plurality of hooking claws 14c are formed on each of the five needle body portions 14a. The needle bar 30 is driven up and down by the needle bar up / down movement mechanism 31 in a state where the wool 81 is overlaid on the work cloth 80 on the needle plate 12 and pressed from above by the cloth presser 48, and FIG. When the punching needle 14 is moved up and down from the position shown by the solid line to the position shown by the dashed line, as shown in FIG. 13, a part of the wool 81 is hooked by a plurality of hooking claws 14 c and pressed into the work cloth 80. The five needle body portions 14a are configured to penetrate the work cloth 80 and the wool 81. The needle holding portion 14b includes an upper half portion having a small diameter portion and a lower half portion having a large diameter portion, and the small diameter portion is held by the second holding portion 52 of the needle attachment 50.
[0034]
As shown in FIG. 9, the needle mounting tool 50 is formed in a block shape extending horizontally left and right, and a pair of front and rear holding members 53 and 54 forming first and second holding portions 51 and 52 having a cylindrical hole shape. Having. A pair of first concave portions 53a, 54a having a semicircular shape in plan view and forming a first holding portion 51 are formed on the right side of the pair of holding members 53, 54, respectively, while one pair is formed. On the left side of the holding members 53 and 54, a pair of second concave portions 53b and 54b which form the second holding portion 52 and have a semicircular shape in plan view are formed to face each other.
[0035]
Three screws 55 to 57 having different screw diameters are attached to the needle mounting tool 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 respectively formed in the front holding member 53, while three screws are formed in the rear holding member 54. Three holes with female threads corresponding to the screw diameters of 55 to 57 are formed respectively. The three screws 55 to 57 are 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 in which the fastening state is released), the pair of holding members 53 and 54 are configured to be separable from each other. The first and second holding portions 51 and 52 hold the needle bar 30 and the punching needle 14 by fastening the three screws 55 to 57.
[0036]
A positioning pin 58 is provided on the right side of the second concave portion 53b of the front holding member 53, and is provided with a positioning pin 58 projecting rearward. 59 are 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 one of the holding members 53 and 54 with respect to the other can be easily determined. Has become.
[0037]
Further, as shown in FIG. 9, concave portions 53c, 54c to which the head of the mounting screw 42 can be engaged are provided on the right side of the lower ends of the first concave portions 53a, 54a of the pair of front and rear holding members 53, 54. When the needle bar 30 is held by the first holding portion 51, the heads of the mounting screws 42 engage with these recesses 53c and 54c, respectively, so that the rotation of the needle mount 50 with respect to the needle bar 30 is restricted. Will be.
[0038]
Next, the needle hole closing member 60 unique to the present application will be described.
As shown in FIGS. 7, 8, and 13 to 16, the needle hole closing member 60 is a circular thin plate that closes the needle hole 12 a of the needle plate 12 for needle punching. Reference numeral 60 has five needle holes 60a (second needle holes) each having a smaller hole diameter than the needle hole 12a and through which the needle main body 14a of the punching needle 14 can be inserted.
[0039]
The needle hole closing member 60 is formed of a thin plate made of an aluminum alloy that is softer than the steel needle main body portion 14a, and has five needle holes 60a formed in the center of the needle hole closing member 60. The lower surface of the needle hole closing member 60 is coated with an adhesive for fixing the needle hole closing member 60 to the needle plate. Before attaching to the needle plate 12, the lower surface of the needle hole closing member 60 is covered with a piece of paper (not shown). The needle hole closing member 60 is also formed with a hole 60b for removal, and the tip of a tool such as a screwdriver is engaged with the hole 60b to be fixed to the needle plate 12 with an adhesive. The needle hole closing member 60 can be removed.
[0040]
Because the needle hole 12a of the needle plate 12 having a large diameter is closed by the needle hole closing member 60, when the punching needle 14 descends during the needle punching process, the work cloth on the needle plate 12 It is possible to prevent the needle plate 12 from being partially dropped from the needle hole 12a to the lower side of the needle plate 12 with the descending operation. Therefore, the work cloth can be smoothly fed, and the needle punching processing is not repeatedly performed on the same portion of the work cloth.
[0041]
Next, a method of attaching the needle hole closing member 60 to the needle plate 12 will be described.
First, as shown in FIG. 15, after removing the protection cover 46, the protection cover holder 45, and the presser foot 48, the hand pulley 23 is turned to prevent the needle body 14 a of the punching needle 14 from being inserted into the needle hole 12 a of the needle plate 12. After being moved to the vicinity of the upper limit position, the release paper covering the lower surface of the needle hole closing member 60 is peeled off, and the needle hole closing member 60 is moved upward from the lower end side of the needle main body portion 14a, and the five needle main bodies are moved. The portion 14a is inserted into the five needle holes 60a of the needle hole closing member 60 (insertion step).
[0042]
Next, as shown in FIG. 16, the state in which the needle main body portion 14a is inserted through the needle hole 60a of the needle hole closing Meanwhile, the punching needle 14 is lowered by turning the hand pulley 23 until the tip of the needle main body 14a passes through the needle hole 12a of the needle plate 12 (needle lowering step).
The needle hole closing member 60 is fixed to the needle plate 12 with an adhesive while maintaining the state where the needle main body portion 14a is inserted into the needle hole 60a, and the needle hole 12a of the needle plate 12 is fixed by the needle hole closing member 60. Close (fixing process).
[0043]
According to this mounting method, the needle hole closing member 60 can be mounted on the needle plate 12 in a state where the five needle body portions 14a of the punching needle 14 are inserted into the five needle holes 60a of the needle hole closing member 60. Therefore, when performing the needle punching after attaching the needle hole closing member 60 to the needle plate 12, the five needle body portions 14a are surely inserted into the five needle holes 60a.
[0044]
Next, the operation of the sewing machine M will be described. First, as shown by the chain line in FIGS. 3 and 4, in a state where the sewing needle 13 with the eye is attached to the needle holder 33 provided at the lower end of the needle bar 30 by the screw 40, the sewing is performed by the normal sewing. A seam can be formed on the work cloth on 11. That is, when the needle bar 30 is moved up and down by the needle bar up / down movement mechanism 31, the upper thread extending downward from the eye of the sewing needle 13 is captured by the blade point of the shuttle mechanism 10 located below the needle plate 11. Then, the stitches are formed on the work cloth by being pulled upward by the balance 32.
[0045]
On the other hand, when performing the needle punching process on the work cloth 80 using the punching needle 14, the screw 40 is loosened, the sewing needle 13 is removed 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 1. Then, with the needle bar 30 and the needle holding portion 14b of the punching needle 14 held between the pair of holding members 53 and 54 of the needle mounting tool 50 separated from each other, the three screws 55 to 57 are tightened to make the first The needle bar 30 and the punching needle 14 are respectively held by the second holding portions 51 and 52, and the punching needle 14 is attached at a position separated from the needle bar 30 by a predetermined distance to the left.
[0046]
Then, after the protective cover holder 45 is connected to the lower end of the holding rod 44, the wool 81 is passed through the guide hole 48f and the circular hole 48e, and then the wool 81 is overlaid on the work cloth 80. After this series of operations is completed, the presser foot lifting lever 49 is operated to lower the work clamp 48, and the work bar 80 and the yarn 81 are pressed by the work presser 48, and the needle bar 30 is moved by the needle bar vertical movement mechanism 31. Is moved up and down.
[0047]
Then, the punching needle 14 moves up and down at a position shifted leftward from the shuttle mechanism 10, and as shown in FIG. 13, a plurality of hooking claws 14 c formed on the five needle main bodies 14 a of the punching needle 14. As a result, the five needle body portions 14a penetrate the work cloth 80 and the wool 81 while hooking a part of the wool 81, and a part of the wool 81 hooked on the hooking claw 14c is pushed into the work cloth 80. Thus, a decorative pattern is formed on the work cloth 80.
[0048]
Here, a needle hole closing member 60 for closing the needle hole 12a is attached to the needle plate 12, and in the above-described needle punching process, the five needle body portions 14a of the punching needle 14 are attached to the needle hole 12a. It is inserted through five needle holes 60a of the needle hole closing member 60 having a smaller hole diameter. As described above, since the needle hole 12a of the needle plate 12 having a large hole diameter is closed by the needle hole closing member 60, the work cloth 80 on the needle plate 12 is moved from the needle hole 12a through the needle hole 12a as the punching needle 14 descends. It is possible to prevent the lower part of the plate 12 from partially falling.
[0049]
According to the sewing machine M and the needle hole closing member 60 described above, the following effects can be obtained.
1) When the needle hole 12a of the needle plate 12 is closed by the needle hole closing member 60 and the punching needle 14 descends during the needle punching process, the five needle body portions 14a of the punching needle 14 The five needle holes 60a of the needle hole closing member 60 smaller than the needle holes 12a of the needle plate 12 are inserted. Therefore, it is possible to prevent the work cloth 80 on the needle plate 12 from partially falling from the needle hole 12a to the lower side of the needle plate 12 due to the downward movement of the punching needle 14. Therefore, the work cloth 80 can be smoothly fed by the feed mechanism, and the same portion of the work cloth 80 is not subjected to needle punching processing many times.
[0050]
Further, since there is no problem even if the diameter of the needle hole 12a of the needle plate 12 is slightly large, the processing accuracy when forming the needle hole 12a in the needle plate 12 may not be so strict, which is advantageous in manufacturing cost. . Further, since the needle hole closing member 60 is detachably attached to the needle plate 12, the needle hole closing member 60 having an appropriate shape can be attached according to the type of the punching needle 14 to be used.
[0051]
2) Since the needle hole closing member 60 is made of a softer material than the needle body 14a of the punching needle 14, the needle body 14a of the punching needle 14 is slightly elastically deformed by vibration or impact during needle punching. Even if the needle drop position slightly shifts, the needle body 14a is not prevented from being inserted through the five needle holes 60a, and the needle body 14a is not damaged.
[0052]
3) Since the adhesive is applied to one side of the needle hole closing member 60, the adhesive allows the needle hole closing member 60 to be easily attached and the needle hole closing member 60 to be removed from the needle plate 12. Is also easy.
4) The needle hole closing member 60 is provided with a hole portion 60b for removing the needle hole closing member 60 from the needle plate 12, so that a tool such as a screwdriver is engaged with the hole portion 60b so that the needle hole closing member 60 can be easily removed. It can be removed from the needle plate 12.
[0053]
5) When attaching the needle hole closing member 60 to the needle plate 12, the needle hole closing member is inserted in a state where the five needle body portions 14 a of the punching needle 14 are inserted through the five needle holes 60 a of the needle hole closing member 60. Since the needle hole 60 can be attached to the needle plate 12, when performing the needle punching process after attaching the needle hole closing member 60 to the needle plate 12, the five needle body portions 14a are surely inserted into the five needle holes 60a. The needle body 14a can be prevented from interfering with the needle plate 12. Further, when attaching the needle hole closing member 60 to the needle plate 12, high mounting accuracy is not required, which is advantageous in terms of manufacturing cost, and an operator can freely attach the needle hole closing member 60 to the needle plate 12. It will be easier.
[0054]
Next, modified embodiments in which various modifications are made to the above-described embodiment will be described.
1) As the needle hole closing member 60, various materials can be used in addition to the aluminum alloy of the above embodiment, but a needle main body of the punching needle 14, such as copper, synthetic resin, or synthetic rubber. It is desirable to be made of a material softer than 14a. When the needle hole closing member 60 is made of a material such as a flexible synthetic resin or synthetic rubber, it is easy for an operator to peel off the needle hole closing member 60 from the needle plate 12 by hand. The hole 60b for removal may be omitted.
[0055]
2] In the above embodiment, the needle hole closing member 60 is fixed to the needle plate 12 by the adhesive applied to the lower surface of the needle hole closing member 60. However, the needle hole closing member 60 is formed of a magnet. Then, the magnetic force may be fixed to the needle plate 12.
[0056]
3] The needle hole closing member can be attached not only to the needle punching sewing machine of the above-described embodiment but also to a general sewing machine that forms a linear stitch on a work cloth using a sewing needle. In this case, One needle hole is provided in the needle hole closing member. Further, the present invention is applied to a so-called zigzag sewing machine that forms a zigzag stitch by swinging a needle bar equipped with a sewing needle back and forth, and a needle hole for a long left and right zigzag stitch formed on a needle plate, It may be configured so as to be closed by a needle hole closing member having a small needle hole, and used for straight stitching.
[0057]
According to the first aspect of the present invention, the thin needle hole closing member for closing the first needle hole is detachably attached to the needle plate, so that the first needle of the needle plate can be removed. The hole is closed by the needle hole closing member, and the needle passes through the second needle hole of the needle hole closing member having a smaller hole diameter than the first needle hole of the needle plate. Therefore, the workpiece on the needle plate can be prevented from falling downward from the needle hole as much as possible, and the workpiece can be smoothly moved on the needle plate. In addition, since the diameter of the first needle hole may be somewhat large, the processing accuracy when forming the first needle hole in the needle plate may not be so severe, which is advantageous in terms of manufacturing cost. Further, since the needle hole closing member is detachably attached to the needle plate, a needle hole closing member having an appropriate shape can be attached according to the type of needle used.
[0058]
According to the second aspect of the present invention, since the needle hole closing member is made of a material softer than the needle, the needle is slightly reduced due to vibration or impact when the needle penetrates the workpiece on the needle plate. Even if the needle drop position with respect to the needle hole closing member is slightly shifted due to elastic deformation, the insertion of the needle through the second needle hole is not prevented, and the needle is not damaged.
[0059]
According to the third aspect of the present invention, since the adhesive is applied to one side of the needle hole closing member, the adhesive allows the needle hole closing member to be easily attached to the needle plate, and the needle hole closing member can be easily mounted. Can be easily removed from the needle plate.
According to the fourth aspect of the present invention, since the needle hole closing member has the hole for removing the needle hole closing member from the needle plate, the tool or the like is engaged with the hole to easily remove the needle hole closing member from the needle plate. be able to.
[0060]
According to the fifth aspect of the invention, substantially the same effects as those of the first aspect can be obtained, and the description thereof is omitted.
According to the invention of claim 6, by such a simple mounting method, the needle hole closing member can be easily mounted on the needle plate while maintaining the state in which the needle is inserted through the second needle hole, and Since the needle is reliably inserted into the second needle hole when penetrating the workpiece on the needle plate, it is possible to prevent the needle from interfering with the needle plate. In addition, when mounting the needle hole closing member to the needle plate, high mounting accuracy is not required, and the mounting is easy, and the operator can easily mount the needle hole closing member freely on the needle plate.
[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 main parts of a bed and a head.
FIG. 5 is a plan view of a needle plate for normal sewing.
FIG. 6 is a plan view of a needle plate for needle punching.
FIG. 7 is a perspective view of a main part of a bed part and a head part (an upper limit position of a punching needle).
FIG. 8 is a perspective view of a main part of a bed portion and a head portion (a lower limit position of a punching needle).
FIG. 9 is an exploded perspective view of a needle bar, a needle holder, and a needle attachment.
FIG. 10 is a perspective view of a punching needle and a cloth presser during needle punching.
11A and 11B are diagrams showing a punching needle, wherein FIG. 11A is a front view of the punching needle, and FIG. 11B is a view of the punching needle as viewed from below.
FIG. 12 is a partially enlarged front view of a needle main body.
FIG. 13 is a partially enlarged cross-sectional view near the needle plate during needle punching.
FIG. 14 is a plan view of a needle hole closing member.
FIG. 15 is a perspective view of a main part of a bed and a head in an insertion step.
FIG. 16 is a perspective view of a main part of a bed and a head in a needle descending step.
[Explanation of symbols]
M sewing machine
12 Needle plate
12a Needle hole
14 Punching needle
14a Needle body
60 Needle hole closing member
60a Needle hole
60b hole

Claims

針が挿通可能な第１の針穴を有するミシンの針板に取り外し可能に取付けられて前記第１の針穴を塞ぐ薄板状の針穴閉塞部材であって、
前記第１の針穴よりも穴径が小さく且つ針が挿通可能な１又は複数の第２の針穴を有することを特徴とするミシンの針穴閉塞部材。A thin plate-shaped needle hole closing member detachably attached to a needle plate of a sewing machine having a first needle hole through which a needle can be inserted to close the first needle hole,
A needle hole closing member for a sewing machine, comprising: one or a plurality of second needle holes having a hole diameter smaller than the first needle hole and through which a needle can be inserted.

前記針よりも軟質の材料で構成されたことを特徴とする請求項１に記載のミシンの針穴閉塞部材。The needle hole closing member for a sewing machine according to claim 1, wherein the needle hole closing member is made of a material softer than the needle.

片面に粘着剤が塗布されていることを特徴とする請求項１又は２に記載のミシンの針穴閉塞部材。3. The needle hole closing member of the sewing machine according to claim 1, wherein an adhesive is applied to one surface.

前記針板から取り外す為の穴部を有することを特徴とする請求項１〜３の何れかに記載のミシンの針穴閉塞部材。The needle hole closing member for a sewing machine according to any one of claims 1 to 3, further comprising a hole for removing the needle hole from the needle plate.

針とこの針が挿通可能な第１の針穴を有する針板とを備えたミシンにおいて、
前記針板に取り外し可能に取付られて第１の針穴を塞ぐ薄板状の針穴閉塞部材であって、第１の針穴よりも穴径が小さく且つ針が挿通可能な１又は複数の第２の針穴を有する針穴閉塞部材を備えたことを特徴とするミシン。In a sewing machine including a needle and a needle plate having a first needle hole through which the needle can be inserted,
A thin-plate-shaped needle hole closing member detachably attached to the needle plate to close a first needle hole, wherein the hole diameter is smaller than that of the first needle hole and one or a plurality of first needle holes can be inserted therethrough. A sewing machine comprising a needle hole closing member having two needle holes.

上下動可能な針とこの針が挿通可能な第１の針穴を有する針板とを備えたミシンに、前記第１の針穴を塞ぐ薄板状の針穴閉塞部材であって、第１の針穴よりも穴径が小さく且つ針が挿通可能な１又は複数の第２の針穴を有する針穴閉塞部材を取付ける針穴閉塞部材の取付方法であって、
針が前記第１の針穴に挿通しない上限位置付近にある状態で針穴閉塞部材の第２の針穴に針を挿通させる挿通工程と、
針が第２の針穴に挿通した状態で針の先端が第１の針穴を挿通するまで針を下降させる針下降工程と、
針が第２の針穴に挿通した状態を維持しつつ針穴閉塞部材を針板に固着させて第１の針穴を塞ぐ固着工程と、
を備えたことを特徴とする針穴閉塞部材の取付方法。A thin-plate-shaped needle hole closing member for closing a first needle hole in a sewing machine including a needle which can move up and down and a needle plate having a first needle hole through which the needle can be inserted, wherein A method of attaching a needle hole closing member for mounting a needle hole closing member having a hole diameter smaller than a needle hole and having one or a plurality of second needle holes through which a needle can be inserted,
An insertion step of inserting a needle through the second needle hole of the needle hole closing member in a state where the needle is near the upper limit position where the needle is not inserted through the first needle hole,
A needle lowering step of lowering the needle until the tip of the needle passes through the first needle hole with the needle inserted through the second needle hole;
A fixing step of fixing the needle hole closing member to the needle plate and closing the first needle hole while maintaining a state in which the needle is inserted through the second needle hole;
A method for attaching a needle hole closing member, comprising: