JP4036353B2 - Feed dog height adjustment mechanism - Google Patents

Feed dog height adjustment mechanism Download PDF

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JP4036353B2
JP4036353B2 JP02947399A JP2947399A JP4036353B2 JP 4036353 B2 JP4036353 B2 JP 4036353B2 JP 02947399 A JP02947399 A JP 02947399A JP 2947399 A JP2947399 A JP 2947399A JP 4036353 B2 JP4036353 B2 JP 4036353B2
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feed
shaft
feed dog
vertical
horizontal
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JP2000225280A (en
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正彦 佐藤
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Juki Corp
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Juki Corp
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Priority to KR1020000005127A priority patent/KR100586266B1/en
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Priority to CN00102206A priority patent/CN1101867C/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/24—Feed-dog lifting and lowering devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/30—Details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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

Description

【０００１】
【発明の属する技術分野】
本発明はミシンの送り歯高さ調整機構に関する。
【０００２】
【従来の技術】
図６は従来例によるミシンの送り歯機構を示す。この送り歯機構１は２本針水平釜のミシン用のものである。図において送り歯機構１は水平送り軸２、上下送り軸４および送り台６を有する。水平送り軸２と上下送り軸４は共にミシンの主軸（図示せず）と連動して回動可能である。送り台６は水平方向に伸びる水平部６ａと鉛直方向に伸びる鉛直部６ｂとを有し、水平部６ａに送り歯８を支持している。
【０００３】
送り台６の水平部６ａは水平送り台軸１０および水平送り腕１２を介して水平送り軸２へ連結されることにより、送り台６は水平送り軸２の回動に伴って水平方向に運動する。一方、送り台６の鉛直部６ｂは上下送り腕１４および上下送りカム１６を介して上下送り軸４へ連結されることにより、送り台６は上下送り軸４の回動に伴って上下方向に運動する。これにより、送り歯８は楕円軌跡を描きながら上下および水平方向に運動する。
【０００４】
上下送り腕１４は送り台６の鉛直部６ｂとの連結部に溝部１４ａを形成されており、この溝部１４ａ内に送り台６の鉛直部６ｂが嵌合し、ねじ１８によって送り台６と上下送り腕１４とが連結固定される。
【０００５】
図８および図９は図６の送り歯機構１を２本針水平釜のミシンに組み込んだ際にその組み込まれる位置を概略的に示すための図である。図８は正面図でありこの場合の送り歯機構１は図６の矢印Ａ方向から見た図となり、図９は下面図であり、この場合の送り歯機構１は図６の矢印Ｂ方向から見た図となる。２つの釜軸台２０がミシンに固定されて図示のように併置されている。各釜軸台２０には釜軸２２が回転可能に取付けられ、各釜軸２２の上端に水平釜２４が装着されている。各釜軸２２には釜軸歯車２６が固定されている。また、釜軸台２０には釜軸２２内の図示しない潤滑油経路を介して水平釜２４へ潤滑油を供給するための潤滑油チューブ２７が連結されている。この釜軸台２０、釜軸２２、水平釜２４、釜軸歯車２６、潤滑油チューブ２７その他図示しない部品等によって釜軸台ユニット２８が構成される。
【０００６】
図１０は本縫いミシンの送り歯機構３１の一例を示す図である。水平送り軸３２と上下送り軸３４は共に図示しないミシンの主軸に連動して回動する。中央部に送り歯３８を支持する送り台３６はその一端を水平送り台軸１０および水平送り腕４０を介して水平送り軸３２へ連結され、他端を上下送り台軸１１および上下送り腕４２を介して上下送り軸３４へ連結されている。このように上下送り軸３４と送り台３６とを連結する上下送り腕４２、あるいは水平送り軸３２と送り台３６とを連結する水平送り腕４０はいずれも送り台３６の長さに対して非常に短いのが通例である。
【０００７】
【発明が解決しようとする課題】
被縫製物の種類等に応じて送り歯８の高さを調整する必要が生じることがある。特に、下着等のような薄くて柔らかい被縫製物では送り歯８による布送りの際に滑りが生じ易いため、送り歯８高さを微調整する必要があることが多い。
【０００８】
図６の送り歯機構１はその構成上、送り歯８の高さを調整可能とされている。すなわち、送り台６と上下送り腕１４とを連結しているねじ１８をゆるめて上下送り腕１４の溝部１４ａ内の鉛直部６ｂを上下にスライドさせて送り歯８の高さを決め、再びねじ１８を締めることにより送り歯８の高さを調整可能である。しかしながら、図８および図９に示すように、スライドさせる必要のある鉛直部６ｂと締めたり緩めたりする必要のあるねじ１８がいずれも２つの釜軸台ユニット２８の間にあり、且つ２つの釜軸台ユニット２８の各部品が入りくんでいる個所で調整作業を行う必要があるため調整作業には非常な困難を伴う。このため実質的にはこのような方法で調整することは不可能であった。また、この送り歯機構１の鉛直部６ｂをスライドさせることによる方法においては、送り歯８の高さの微調整をすることができない。
【０００９】
このため、図７に示すように、送り歯８と送り台６の間に適当な厚みのシート片３０例えば紙を挟んで送り歯８の高さを調整していた。
【００１０】
本発明の目的は、簡単に送り歯の高さを調整可能な機構を提供することにある。
本発明の更に他の目的は、送り歯の高さの微調整が可能な機構を提供することにある。
本発明の更に他の目的は、以下の説明により明らかとなる。
【００１１】
【課題を解決するための手段】
上記目的を達成するために本発明によれば、ミシンの主軸に連動する水平送り軸および上下送り軸により四送り運動が付与される送り歯と、水平部を有しその水平部に前記送り歯を支持する送り台と、前記上下送り軸に連結された第１連結部材と、一端が偏心部材を介して前記第１連結部材に連結され、他端が前記送り台の水平部へ連結される第２連結部材と、を備え、前記偏心部材を回動することにより送り歯の高さを調整可能であることを特徴とする送り歯高さ調整機構が提供される。
【００１２】
前記第２連結部材は例えば前記送り台に固定された鉛直部である。
好ましくは送り台の水平部は鉛直部との接続部近傍へ前記送り歯を支持する。
また、例えば前記ミシンは２本針の水平釜ミシンであり、送り歯高さ調整機構は２つの釜軸台ユニットの間に配置される。
好ましくは偏心部材は前記２つの釜軸台ユニットの下端部近くに配置されている。
【００１３】
【発明の実施の形態】
以下、図面に基づいて本発明の実施の形態を説明する。
【００１４】
図１は本実施の形態によるミシンの送り歯高さ調整機構を有する送り歯機構を示し、図２は図１の機構において送り歯の高さを調整する原理を説明するための簡略図、図３および図４は図１の送り歯機構が２本針水平釜ミシンへ組み込まれる位置を概略的に示すための図であり、図３は正面図でありこの場合の送り歯機構は図１の矢印Ａ方向から見た図となり、図４は下面図であり、この場合の送り歯機構は図１の矢印Ｂ方向から見た図となる。
【００１５】
これらの図において送り歯機構５１は水平送り軸２、上下送り軸４および送り台５６を有する。水平送り軸２と上下送り軸４は共にミシンの主軸（図示せず）と連動して回動可能である。送り台５６は水平方向に伸びる水平部５６ａと鉛直方向に伸びる鉛直部５６ｂ（第２連結部材）とから形成され、水平部５６ａは鉛直部５６ｂとの接続部近傍へ送り歯８を支持している。鉛直部５６ｂは少し湾曲しながら鉛直下方へ伸びている。
【００１６】
送り台５６の水平部５６ａは水平送り台軸１０および水平送り腕１２を介して水平送り軸２へ連結され、これにより送り台５６は水平送り軸２の回動に伴って水平方向に運動する。送り台５６の鉛直部５６ｂは，これを両端で支持する偏心軸５８を介して上下送り腕５４（第１連結部材）へ連結され、上下送り腕５４は上下送りカム１６を介して上下送り軸４へ連結され、これにより送り台５６は上下送り軸４の回動に伴って上下方向に運動する。
【００１７】
このようにして送り歯の四送り運動が付与される。送り歯の四送り運動とは送り歯８が楕円形の軌跡を描きながら図示しない針板上面に出、針板上面で前進し、針板下面に沈み、針板下面で後退する運動である。
【００１８】
偏心軸５８はねじ６０によって上下送り腕５４へ締め付け固定されている。送り歯８の高さを調整する際には、ねじ６０をゆるめて偏心軸５８の頭部に設けた溝（図示省略）にドライバーを差し込み適当な角度だけ回転させた後再びねじ６０を締め付ける。図２（Ａ）に示すように偏心部が最下方に位置するように偏心軸５８を回転させた後ねじ６０により偏心軸５８を上下送り腕５４へ締め付け固定すると送り歯８の高さも最下方に調整される。一方図２（Ｂ）に示すように偏心軸５８の偏心部が最上方に位置するように調整すると、送り歯８の高さも最上方に調整される。
【００１９】
このように本実施の形態による送り歯高さの調整機構によれば、簡単な操作で送り歯高さの調整が出来る。偏心量は偏心軸５８を回転することにより調整されるので従来のスライド方式に比べると微調整が可能となった。
【００２０】
図３および図４の釜軸台２０、釜軸２２、水平釜２４、釜軸歯車２６および潤滑油チューブ２７を有する釜軸台ユニット２８の配置は図８および図９の場合と同様であるが本実施の形態の送り歯機構のねじ６０および偏心軸５８は釜軸台ユニット２８の下端部の近くに位置し、しかもねじ６０の操作部（頭部）側が２つの釜軸台ユニット２８の間から少し突出する側へ向いているので緩めたり締めたりすることが容易である。更に、偏心軸５８もねじ６０と同様に操作し易い位置にあることに加え、図６〜図９の従来例のスライド方式と異なり、単に偏心軸５８を回転させるだけでよいことから狭い場所でも容易に調整作業を行うことができる。
【００２１】
なお、送り歯８の高さを調整するため、鉛直部５６ｂと上下送り腕５４の連結部（偏心軸５８）と上下送り軸４との相対的位置関係を変化させると送り歯８の送り軌跡も変化する。例えば、ミシンの静止状態において、偏心軸５８の向きや偏心量を変化させた結果、上下送り腕５４が上下送り軸４の回りにθ度回動したとすると、この回動の結果、ミシンの運転操作時、送り歯８の送り軌跡も変化する。当然であるがその変化の度合は上記の角度θが大きくなるに従って大きくなる。
【００２２】
例えば図１０に示すような送り歯機構３１において上下送り台軸１１の位置を上下に変化させて上下送り軸３４と上下送り台軸１１との相対的位置関係を変化させるとその結果、上下送り腕４２が上下送り軸３４の回りにα度回転する。この場合、上下送り腕４２の長さが短いため、上記の角度αが大きくなり、送り歯３８の送り軌跡が大きく変化しやすい。
【００２３】
しかしながら本実施の形態による送り歯機構５１の送り歯高さ調整機構においては上下送り軸４と偏心軸５８の軸心間の距離が比較的長く従って上下送り腕５４の長さが長いいため、偏心軸５８の向きや偏心量の大きさに対する上下送り腕５４の回動角θの変化が小さくなる。その結果、送り歯８の送り軌跡の変化が小さくなる。
【００２４】
図５は本実施の形態の送り歯高さ調整機構によって偏心軸５８による偏心量を変化させたときの送り歯８の高さの変化の大きさを説明するための図である。図において、偏心軸５８の回動による上下送り腕５４と鉛直部５６ｂの連結部の鉛直方向変位量をｘ、送り歯８の鉛直方向変位量をｙ、偏心軸５８と水平送り台軸１０の中心との間の水平距離をＬ１、送り歯８と水平送り台軸１０の中心との間の水平距離をＬ２とすると、ｙ＝ｘＬ２／Ｌ１となる。従って、Ｌ１をＬ２に近付けることによって一定のｘに対してのｙの値を大きくすることができる。
【００２５】
本実施の形態による送り歯高さ調整機構は送り台５６が水平部５６ａと、この水平部５６ａに一体的に固定された鉛直部５６ｂとから形成されていて、水平部５６ａは鉛直部５６ｂとの接続部近傍に送り歯８を支持しているので、Ｌ１をＬ２に近付けることが可能である。なお、鉛直部５６ｂの弯曲を小さくしてより直線形状に近くすることにより更にＬ１をＬ２に近付けることが可能である。
【００２６】
図１０の本縫いミシンの送り歯機構３１の場合に、上下送り台軸１１の高さを何等かの方法によってｘだけ変化させた時の送り歯３８の高さの変化をｙとし、水平送り台軸１０と上下送り台軸１１の軸間距離をＬ１、送り歯３８と水平送り台軸１０の間の距離をＬ２とすると前記と同様にｙ＝ｘＬ２／Ｌ１となる。図示の送り歯機構３１の場合、Ｌ２がＬ１の約１／２であるのでｙもｘの約１／２となってしまう。
【００２７】
さらに図１０の機構ではその構成上、上下送り台軸１１の高さを変化させると送り歯８の運動は上下方向のみならず水平方向も変化してしまう。本実施の形態による送り歯高さ調整機構の場合は、上下送り腕５４の上下動は鉛直部５６ｂを介して送り台５６へ伝達されるので、偏心軸５８の高さを調整しても送り歯８の運動に水平方向の変化は殆どない。
【００２８】
【発明の効果】
本発明の送り歯高さ調整機構によれば、水平部を有しその水平部に前記送り歯を支持する送り台と、前記上下送り軸に連結された第１連結部材と、一端が偏心部材を介して前記第１連結部材に連結され、他端が前記送り台の水平部へ連結される第２連結部材と、を備え、前記偏心部材を回動することにより送り歯の高さを調整可能としたので、簡単な操作で送り歯高さの調整が出来、且つ微調整が可能となった。
【００２９】
また、本発明による送り歯高さ調整機構は送り台が水平部と、この水平部に固定された鉛直部とから形成されているので、水平送り腕と送り台との連結点から偏心軸までの水平距離を、送り歯と水平送り台軸との間の水平距離に近付けることが可能となり、従って偏心部材による偏心量に対する送り歯の高さ調整量の比を大きくすることができる。
【００３０】
さらに、送り台の水平部は鉛直部との接続部近傍へ前記送り歯を支持することによって水平送り腕と送り台との連結点から偏心軸までの水平距離を、送り歯と水平送り台軸との間の水平距離へ更に近付けることが可能となり、従って偏心部材による偏心量に対する送り歯の高さ調整量の比を更に大きくすることができる。
【００３１】
本発明の送り歯高さ調整機構が２本針の水平釜ミシンに組み込まれ、送り歯高さ調整機構は２つの釜軸台ユニットの間に配置される場合、偏心部材を第１連結部材へ固定する固定手段とを２つの釜軸台ユニットの下端部近くに配置することができるので固定手段および偏心部材が操作し易い位置にあることに加え、従来例のスライド方式と異なり、単に偏心部材を回転させるだけよいことから狭い場所でも容易に調整作業を行うことができる。
【図面の簡単な説明】
【図１】 本発実施の形態による送り歯高さ調整機構を有する送り歯機構を示す図である。
【図２】 図１の機構において送り歯の高さを調整する原理を説明するための簡略図である。
【図３】 図１の送り歯機構が２本針水平釜ミシンへ組み込まれる位置を概略的に示すための正面図である。
【図４】 図１の送り歯機構が２本針水平釜ミシンへ組み込まれる位置を概略的に示すための側面図である。
【図５】 図１の送り歯高さ調整機構によって偏心軸による偏心量を変化させたときの送り歯の高さの変化の大きさを説明するための図である。
【図６】 従来例による送り歯機構を示す図である。
【図７】 図６の機構において送り歯の高さを調整する方法を示す図である。
【図８】 図６の送り歯機構を２本針水平釜のミシンに組み込んだ際にその組み込まれる位置を概略的に示すための正面図である。
【図９】 図６の送り歯機構を２本針水平釜のミシンに組み込んだ際にその組み込まれる位置を概略的に示すための下面図である。
【図１０】 本縫いミシンの送り歯機構の一例を示す図である。
【符号の説明】
１ 送り歯機構 ２ 水平送り軸 ４ 上下送り軸
６ 送り台 ６ａ 水平部 ６ｂ 鉛直部
８ 送り歯 １０ 水平送り台軸 １１ 上下送り台軸
１２ 水平送り腕 １４ 上下送り腕 １４ａ 溝部
１６ 上下送りカム １８ ねじ ２０ 釜軸台
２２ 釜軸 ２４ 水平釜 ２６ 釜軸歯車
２７ 潤滑油チューブ ２８ 釜軸台ユニット ３０ シート片
３１ 送り歯機構 ３２ 水平送り軸 ３４ 上下送り軸
３６ 送り台 ３８ 送り歯 ４０ 水平送り腕
４２ 上下送り腕 ５１ 送り歯機構
５４ 上下送り腕（第１連結部材） ５６ 送り台
５６ａ 水平部 ５６ｂ 鉛直部（第２連結部材）
５８ 偏心軸 ６０ ねじ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a feed dog height adjusting mechanism of a sewing machine.
[0002]
[Prior art]
FIG. 6 shows a conventional feed dog mechanism of a sewing machine. This feed dog mechanism 1 is for a sewing machine with a two-needle horizontal shuttle. In the figure, the feed dog mechanism 1 has a horizontal feed shaft 2, a vertical feed shaft 4 and a feed base 6. Both the horizontal feed shaft 2 and the vertical feed shaft 4 can be rotated in conjunction with a main shaft (not shown) of the sewing machine. The feed base 6 has a horizontal portion 6a extending in the horizontal direction and a vertical portion 6b extending in the vertical direction, and supports the feed dog 8 on the horizontal portion 6a.
[0003]
The horizontal portion 6a of the feed base 6 is connected to the horizontal feed shaft 2 via the horizontal feed base shaft 10 and the horizontal feed arm 12, so that the feed base 6 moves in the horizontal direction as the horizontal feed shaft 2 rotates. To do. On the other hand, the vertical portion 6 b of the feed base 6 is connected to the vertical feed shaft 4 via the vertical feed arm 14 and the vertical feed cam 16, so that the feed base 6 moves in the vertical direction as the vertical feed shaft 4 rotates. Exercise. Thereby, the feed dog 8 moves vertically and horizontally while drawing an elliptical locus.
[0004]
The vertical feed arm 14 is formed with a groove portion 14 a at a connecting portion with the vertical portion 6 b of the feed base 6, and the vertical portion 6 b of the feed base 6 is fitted in the groove portion 14 a, and the feed base 6 and the vertical direction are connected to the vertical direction 6 b. The feed arm 14 is connected and fixed.
[0005]
FIGS. 8 and 9 are views schematically showing the position where the feed dog mechanism 1 of FIG. 6 is incorporated when it is incorporated into the sewing machine of the two-needle horizontal shuttle. 8 is a front view, and the feed dog mechanism 1 in this case is a view seen from the direction of arrow A in FIG. 6, FIG. 9 is a bottom view, and the feed dog mechanism 1 in this case is from the direction of arrow B in FIG. It will be a view. Two hook shafts 20 are fixed to the sewing machine and juxtaposed as shown. A hook shaft 22 is rotatably attached to each hook shaft base 20, and a horizontal hook 24 is attached to the upper end of each hook shaft 22. A hook shaft gear 26 is fixed to each hook shaft 22. Further, the hook shaft base 20 is connected to a lubricating oil tube 27 for supplying lubricating oil to the horizontal hook 24 via a lubricating oil path (not shown) in the hook shaft 22. The shuttle shaft base unit 28 is constituted by the shuttle shaft base 20, the shuttle shaft 22, the horizontal shuttle 24, the shuttle shaft gear 26, the lubricating oil tube 27, and other parts (not shown).
[0006]
FIG. 10 is a view showing an example of the feed dog mechanism 31 of the lockstitch machine. Both the horizontal feed shaft 32 and the vertical feed shaft 34 rotate in conjunction with a main shaft of a sewing machine (not shown). One end of the feed base 36 that supports the feed dog 38 at the center is connected to the horizontal feed shaft 32 via the horizontal feed base shaft 10 and the horizontal feed arm 40, and the other end is connected to the vertical feed base shaft 11 and the vertical feed arm 42. It is connected to the vertical feed shaft 34 via. In this way, the vertical feed arm 42 that connects the vertical feed shaft 34 and the feed base 36 or the horizontal feed arm 40 that connects the horizontal feed shaft 32 and the feed base 36 are both extremely short of the length of the feed base 36. Usually it is short.
[0007]
[Problems to be solved by the invention]
It may be necessary to adjust the height of the feed dog 8 according to the type of the sewing object. In particular, in a thin and soft sewing product such as underwear, slippage is likely to occur when the feed dog 8 feeds the cloth. Therefore, it is often necessary to finely adjust the height of the feed dog 8.
[0008]
The feed dog mechanism 1 shown in FIG. 6 can adjust the height of the feed dog 8 due to its configuration. That is, the screw 18 connecting the feed base 6 and the vertical feed arm 14 is loosened, the vertical portion 6b in the groove 14a of the vertical feed arm 14 is slid up and down to determine the height of the feed dog 8, and the screw is again screwed. By tightening 18, the height of the feed dog 8 can be adjusted. However, as shown in FIGS. 8 and 9, the vertical portion 6 b that needs to be slid and the screw 18 that needs to be tightened or loosened are between the two hook head unit 28, and the two hooks Since it is necessary to perform the adjustment work at the place where each part of the shaft unit 28 is inserted, the adjustment work is very difficult. For this reason, it was practically impossible to adjust by such a method. Further, in the method by sliding the vertical portion 6b of the feed dog mechanism 1, the height of the feed dog 8 cannot be finely adjusted.
[0009]
For this reason, as shown in FIG. 7, the height of the feed dog 8 is adjusted by sandwiching a sheet piece 30 of appropriate thickness between the feed dog 8 and the feed base 6, for example, paper.
[0010]
An object of the present invention is to provide a mechanism capable of easily adjusting the height of the feed dog.
Still another object of the present invention is to provide a mechanism capable of finely adjusting the height of the feed dog.
Other objects of the present invention will become apparent from the following description.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a feed dog to which a four-feed motion is imparted by a horizontal feed shaft and a vertical feed shaft interlocked with a main shaft of a sewing machine, a horizontal portion, and the feed dog at the horizontal portion. , A first connecting member connected to the vertical feed shaft, one end connected to the first connecting member via an eccentric member, and the other end connected to the horizontal portion of the feed base. And a feed dog height adjusting mechanism, wherein the feed dog height is adjustable by rotating the eccentric member.
[0012]
The second connecting member is, for example, a vertical portion fixed to the feed base.
Preferably, the horizontal portion of the feed base supports the feed dog in the vicinity of the connection portion with the vertical portion.
For example, the sewing machine is a horizontal hook sewing machine having two needles, and the feed dog height adjusting mechanism is disposed between the two hook head units.
Preferably, the eccentric member is disposed near the lower ends of the two shuttle shaft units.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 shows a feed dog mechanism having a feed dog height adjustment mechanism for a sewing machine according to this embodiment, and FIG. 2 is a simplified diagram for explaining the principle of adjusting the height of the feed dog in the mechanism of FIG. 3 and 4 are diagrams for schematically showing the position where the feed dog mechanism of FIG. 1 is incorporated into the two-needle horizontal shuttle sewing machine, FIG. 3 is a front view, and the feed dog mechanism in this case is shown in FIG. 4 is a bottom view, and the feed dog mechanism in this case is a view seen from the direction of arrow B in FIG.
[0015]
In these drawings, the feed dog mechanism 51 has a horizontal feed shaft 2, a vertical feed shaft 4, and a feed base 56. Both the horizontal feed shaft 2 and the vertical feed shaft 4 can be rotated in conjunction with a main shaft (not shown) of the sewing machine. The feed base 56 is formed of a horizontal portion 56a extending in the horizontal direction and a vertical portion 56b (second connecting member) extending in the vertical direction. The horizontal portion 56a supports the feed dog 8 in the vicinity of the connecting portion with the vertical portion 56b. Yes. The vertical portion 56b extends vertically downward while being slightly curved.
[0016]
The horizontal portion 56 a of the feed base 56 is connected to the horizontal feed shaft 2 via the horizontal feed base shaft 10 and the horizontal feed arm 12, whereby the feed base 56 moves in the horizontal direction as the horizontal feed shaft 2 rotates. . The vertical portion 56b of the feed base 56 is connected to the vertical feed arm 54 (first connection member) via an eccentric shaft 58 that supports the vertical portion 56 at both ends. The vertical feed arm 54 is connected to the vertical feed shaft via the vertical feed cam 16. 4, whereby the feed base 56 moves in the vertical direction as the vertical feed shaft 4 rotates.
[0017]
In this way, a four-feed movement of the feed dog is provided. The four-feed motion of the feed dog is a motion in which the feed dog 8 comes out on the upper surface of the needle plate (not shown) while drawing an elliptical locus, moves forward on the upper surface of the needle plate, sinks on the lower surface of the needle plate, and moves backward on the lower surface of the needle plate.
[0018]
The eccentric shaft 58 is fastened and fixed to the vertical feed arm 54 by a screw 60. When adjusting the height of the feed dog 8, the screw 60 is loosened, a screwdriver is inserted into a groove (not shown) provided in the head of the eccentric shaft 58, the screw 60 is rotated by an appropriate angle, and the screw 60 is tightened again. As shown in FIG. 2A, when the eccentric shaft 58 is rotated and fixed to the vertical feed arm 54 by the rear screw 60 so that the eccentric portion is positioned at the lowest position, the height of the feed dog 8 is also at the lowest position. Adjusted to On the other hand, as shown in FIG. 2B, when the eccentric portion of the eccentric shaft 58 is adjusted to be positioned at the uppermost position, the height of the feed dog 8 is also adjusted to the uppermost position.
[0019]
Thus, according to the feed dog height adjusting mechanism according to the present embodiment, the feed dog height can be adjusted with a simple operation. Since the amount of eccentricity is adjusted by rotating the eccentric shaft 58, fine adjustment is possible as compared with the conventional slide system.
[0020]
The arrangement of the hook shaft base unit 28 having the hook shaft base 20, the hook shaft 22, the horizontal hook 24, the hook shaft gear 26, and the lubricating oil tube 27 in FIGS. 3 and 4 is the same as in FIGS. The screw 60 and the eccentric shaft 58 of the feed dog mechanism according to the present embodiment are located near the lower end portion of the hook shaft base unit 28, and the operation portion (head) side of the screw 60 is between the two hook shaft base units 28. It is easy to loosen or tighten because it faces to the side that protrudes slightly. Further, in addition to the position where the eccentric shaft 58 is easy to operate like the screw 60, the eccentric shaft 58 only needs to be rotated unlike the conventional sliding method of FIGS. Adjustment work can be easily performed.
[0021]
In order to adjust the height of the feed dog 8, the feed locus of the feed dog 8 is changed by changing the relative positional relationship between the connecting portion (eccentric shaft 58) of the vertical portion 56b and the vertical feed arm 54 and the vertical feed shaft 4. Also changes. For example, if the vertical feed arm 54 rotates about the vertical feed shaft 4 by θ degrees as a result of changing the direction of the eccentric shaft 58 and the amount of eccentricity in the stationary state of the sewing machine, the result of this rotation is that the sewing machine During the driving operation, the feed locus of the feed dog 8 also changes. Naturally, the degree of change increases as the angle θ increases.
[0022]
For example, in the feed dog mechanism 31 as shown in FIG. 10, when the relative position relationship between the vertical feed shaft 34 and the vertical feed shaft 11 is changed by changing the position of the vertical feed shaft 11 up and down, the vertical feed shaft 11 is changed as a result. The arm 42 rotates α degrees around the vertical feed shaft 34. In this case, since the length of the vertical feed arm 42 is short, the angle α is increased, and the feed locus of the feed dog 38 is likely to change greatly.
[0023]
However, in the feed dog height adjusting mechanism of the feed dog mechanism 51 according to the present embodiment, the distance between the axes of the vertical feed shaft 4 and the eccentric shaft 58 is relatively long, and therefore the length of the vertical feed arm 54 is long. The change in the rotation angle θ of the vertical feed arm 54 with respect to the direction of the eccentric shaft 58 and the magnitude of the eccentricity becomes small. As a result, the change in the feed locus of the feed dog 8 is reduced.
[0024]
FIG. 5 is a diagram for explaining the magnitude of the change in the height of the feed dog 8 when the eccentric amount by the eccentric shaft 58 is changed by the feed dog height adjusting mechanism of the present embodiment. In the figure, the vertical displacement amount of the connecting portion between the vertical feed arm 54 and the vertical portion 56b due to the rotation of the eccentric shaft 58 is x, the vertical displacement amount of the feed dog 8 is y, the eccentric shaft 58 and the horizontal feed base shaft 10 When the horizontal distance between the centers is L1 and the horizontal distance between the feed dog 8 and the center of the horizontal feed base shaft 10 is L2, y = xL2 / L1. Therefore, the value of y for a certain x can be increased by bringing L1 closer to L2.
[0025]
In the feed dog height adjusting mechanism according to the present embodiment, the feed base 56 is formed of a horizontal portion 56a and a vertical portion 56b fixed integrally to the horizontal portion 56a. The horizontal portion 56a is connected to the vertical portion 56b. Since the feed dog 8 is supported in the vicinity of the connecting portion, L1 can be brought close to L2. Note that it is possible to further bring L1 closer to L2 by reducing the curvature of the vertical portion 56b to be closer to a linear shape.
[0026]
In the case of the feed dog mechanism 31 of the lockstitch sewing machine shown in FIG. 10, the change in the height of the feed dog 38 when the height of the vertical feed shaft 11 is changed by x by any method is defined as y. Assuming that the distance between the shaft 10 and the vertical feed shaft 11 is L1, and the distance between the feed dog 38 and the horizontal feed shaft 10 is L2, y = xL2 / L1 as described above. In the case of the feed dog mechanism 31 shown in the figure, since L2 is about 1/2 of L1, y is also about 1/2 of x.
[0027]
Further, in the mechanism of FIG. 10, when the height of the vertical feed base shaft 11 is changed, the movement of the feed dog 8 changes not only in the vertical direction but also in the horizontal direction. In the case of the feed dog height adjusting mechanism according to the present embodiment, the vertical movement of the vertical feed arm 54 is transmitted to the feed base 56 via the vertical portion 56b, so that even if the height of the eccentric shaft 58 is adjusted, the feed There is almost no horizontal change in the movement of the teeth 8.
[0028]
【The invention's effect】
According to the feed dog height adjusting mechanism of the present invention, a feed base having a horizontal portion and supporting the feed dog on the horizontal portion, a first connecting member connected to the vertical feed shaft, and one end being an eccentric member. A second connecting member connected to the first connecting member via the other end and connected to the horizontal portion of the feed base, and adjusting the height of the feed dog by rotating the eccentric member Since it is possible, the feed dog height can be adjusted with a simple operation, and fine adjustment is possible.
[0029]
Further, in the feed dog height adjusting mechanism according to the present invention, the feed base is formed of a horizontal portion and a vertical portion fixed to the horizontal portion, so that the connecting point between the horizontal feed arm and the feed base to the eccentric shaft. Can be made closer to the horizontal distance between the feed dog and the horizontal feed shaft, so that the ratio of the feed dog height adjustment amount to the eccentric amount by the eccentric member can be increased.
[0030]
Further, the horizontal portion of the feed base supports the feed dog in the vicinity of the connection portion with the vertical portion, thereby determining the horizontal distance from the connecting point between the horizontal feed arm and the feed base to the eccentric shaft, and the feed dog and the horizontal feed base shaft. Accordingly, the ratio of the height adjustment amount of the feed dog to the eccentric amount by the eccentric member can be further increased.
[0031]
When the feed dog height adjusting mechanism of the present invention is incorporated in a horizontal hook sewing machine having two needles, and the feed dog height adjusting mechanism is disposed between the two hook shaft base units, the eccentric member becomes the first connecting member. Since the fixing means for fixing can be arranged near the lower end portions of the two shuttle shaft units, the fixing means and the eccentric member are in an easy-to-operate position. Since it is only necessary to rotate, the adjustment work can be easily performed even in a narrow place.
[Brief description of the drawings]
FIG. 1 is a view showing a feed dog mechanism having a feed dog height adjusting mechanism according to an embodiment of the present invention.
FIG. 2 is a simplified diagram for explaining the principle of adjusting the height of the feed dog in the mechanism of FIG. 1;
FIG. 3 is a front view for schematically illustrating a position where the feed dog mechanism of FIG. 1 is incorporated into a two-needle horizontal shuttle sewing machine;
4 is a side view schematically showing a position where the feed dog mechanism of FIG. 1 is incorporated into a two-needle horizontal shuttle sewing machine. FIG.
5 is a diagram for explaining the magnitude of the change in the height of the feed dog when the amount of eccentricity by the eccentric shaft is changed by the feed dog height adjusting mechanism of FIG. 1; FIG.
FIG. 6 is a view showing a feed dog mechanism according to a conventional example.
7 is a view showing a method of adjusting the height of the feed dog in the mechanism of FIG.
8 is a front view for schematically showing a position where the feed dog mechanism of FIG. 6 is assembled when it is incorporated into a sewing machine of a two-needle horizontal shuttle.
9 is a bottom view for schematically showing a position where the feed dog mechanism of FIG. 6 is assembled when it is incorporated into a sewing machine of a two-needle horizontal hook.
FIG. 10 is a diagram showing an example of a feed dog mechanism of a lockstitch sewing machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Feed dog mechanism 2 Horizontal feed shaft 4 Vertical feed shaft 6 Feed stand 6a Horizontal portion 6b Vertical portion 8 Feed dog 10 Horizontal feed stand shaft 11 Vertical feed stand shaft 12 Horizontal feed arm 14 Vertical feed arm 14a Groove portion 16 Vertical feed cam 18 Screw 20 Hook shaft base 22 Hook shaft 24 Horizontal hook 26 Hook shaft gear 27 Lubricating oil tube 28 Hook shaft base unit 30 Sheet piece 31 Feed dog mechanism 32 Horizontal feed shaft 34 Vertical feed shaft 36 Feed stand 38 Feed dog 40 Horizontal feed arm 42 Vertical Feed arm 51 Feed dog mechanism 54 Vertical feed arm (first connecting member) 56 Feed base 56a Horizontal portion 56b Vertical portion (second connecting member)
58 Eccentric shaft 60 Screw

Claims (5)

ミシンの主軸に連動する水平送り軸および上下送り軸により四送り運動が付与される送り歯と、
水平部を有しその水平部に前記送り歯を支持する送り台と、
前記上下送り軸に連結された第１連結部材と、
一端が偏心部材を介して前記第１連結部材に連結され、他端が前記送り台の水平部へ連結される第２連結部材と、を備え、
前記偏心部材を回動することにより送り歯の高さを調整可能であることを特徴とする送り歯高さ調整機構。A feed dog to which a four-feed motion is given by a horizontal feed shaft and a vertical feed shaft linked to the main shaft of the sewing machine
A feed base having a horizontal portion and supporting the feed dog on the horizontal portion;
A first connecting member connected to the vertical feed shaft;
A second connection member having one end connected to the first connection member via an eccentric member and the other end connected to the horizontal portion of the feed base,
A feed dog height adjustment mechanism characterized in that the height of the feed dog can be adjusted by rotating the eccentric member. 請求項１に記載の送り歯高さ調整機構において、前記第２連結部材は前記送り台に固定された鉛直部であることを特徴とする送り歯高さ調整機構。The feed dog height adjusting mechanism according to claim 1, wherein the second connecting member is a vertical portion fixed to the feed base. 請求項１または２に記載の送り歯高さ調整機構において、前記送り台の水平部は鉛直部との接続部近傍へ前記送り歯を支持することを特徴とする送り歯高さ調整機構。The feed dog height adjusting mechanism according to claim 1 or 2, wherein a horizontal portion of the feed base supports the feed dog in the vicinity of a connection portion with a vertical portion. 請求項１〜３のいずれか１つの項に記載の送り歯高さ調整機構において、前記ミシンは２本針の水平釜ミシンであり、送り歯高さ調整機構は２つの釜軸台ユニットの間に配置されることを特徴とする送り歯高さ調整機構。The feed dog height adjusting mechanism according to any one of claims 1 to 3, wherein the sewing machine is a two-needle horizontal shuttle sewing machine, and the feed dog height adjusting mechanism is provided between two shuttle head units. The feed dog height adjusting mechanism is characterized by being arranged in 請求項４に記載の送り歯高さ調整機構において、前記偏心部材は前記２つの釜軸台ユニットの下端部近くに配置されていることを特徴とする送り歯高さ調整機構。5. The feed dog height adjusting mechanism according to claim 4, wherein the eccentric member is arranged near the lower end portions of the two shuttle head units.
JP02947399A 1999-02-08 1999-02-08 Feed dog height adjustment mechanism Expired - Fee Related JP4036353B2 (en)

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Application Number Priority Date Filing Date Title
JP02947399A JP4036353B2 (en) 1999-02-08 1999-02-08 Feed dog height adjustment mechanism
KR1020000005127A KR100586266B1 (en) 1999-02-08 2000-02-02 Feed-dog height adjustment mechanism
TW089202167U TW510368U (en) 1999-02-08 2000-02-03 Feed-dog height adjustment mechanism
CN00102206A CN1101867C (en) 1999-02-08 2000-02-04 Mechanism for regulating height of pay-off teeth

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JP4036353B2 true JP4036353B2 (en) 2008-01-23

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CN115198454B (en) * 2021-04-09 2023-08-18 杰克科技股份有限公司 Sewing machine
CN117265781B (en) * 2023-11-20 2024-02-02 江苏苏骏纺织有限公司 Feeding device on sewing machine

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CN1101867C (en) 2003-02-19
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CN1270246A (en) 2000-10-18
JP2000225280A (en) 2000-08-15

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