JPH02149289A - Feed lifting lock stich sewing machine and method for preventing puckering in the same - Google Patents
Feed lifting lock stich sewing machine and method for preventing puckering in the sameInfo
- Publication number
- JPH02149289A JPH02149289A JP30475288A JP30475288A JPH02149289A JP H02149289 A JPH02149289 A JP H02149289A JP 30475288 A JP30475288 A JP 30475288A JP 30475288 A JP30475288 A JP 30475288A JP H02149289 A JPH02149289 A JP H02149289A
- Authority
- JP
- Japan
- Prior art keywords
- fabric
- presser foot
- feed dog
- feed
- feeding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009958 sewing Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims description 5
- 206010003402 Arthropod sting Diseases 0.000 title 1
- 241000282472 Canis lupus familiaris Species 0.000 claims abstract description 86
- 239000004744 fabric Substances 0.000 claims description 108
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 24
- 230000000630 rising effect Effects 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000012840 feeding operation Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Sewing Machines And Sewing (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、薄生地の2枚合わせ縫い用に供して有用な上
下送り本縫ミシンと、それによるバンカリング防止方法
に関し、押え金の動きに特徴ある改良を加えたものであ
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vertical feed lockstitch sewing machine useful for sewing two pieces of thin fabric together, and a bunkering prevention method using the same. It has some characteristic improvements.
代表的な縫い不良にパッカリングがある。その発生原因
の第1に、生地が滑りやすかったり、生地が薄いなど生
地特性に問題のある場合が挙げられる。第2に糸の張力
が不適切、あるいは押え金の押圧力が強すぎるなどミシ
ン側の調整不良が挙げられよう。Puckering is a typical sewing defect. The first cause of this is when there are problems with the fabric properties, such as the fabric being slippery or thin. Second, there may be improper adjustment of the sewing machine, such as inappropriate thread tension or too strong presser foot pressure.
と(に、異なる素材からなる2種の薄生地を縫着すると
きにパッカリングが発生しやすい。そこでは、たとえミ
シン側の調整をいかに入念に行っても、バンカリングの
発生を完全に阻止できないのが現状である。Puckering is likely to occur when sewing two thin fabrics made of different materials.In such cases, no matter how carefully the sewing machine is adjusted, it is impossible to completely prevent bunkering from occurring. The current situation is that this is not possible.
バンカリング防止の従来技術として、特開昭62’−1
6786号公報がある。これは下送り歯の一部に下針を
設け、これを2枚合わせの生地に突き刺して生地送りを
行う形態であり、生地送り時には押え金を上昇させて、
生地が押え金から摩擦抵抗を受けるのを防止している。As a conventional technique for preventing bunkering, JP-A-62'-1
There is a publication No. 6786. This is a form in which a lower needle is provided on a part of the lower feed dog, and the lower needle is inserted into two pieces of fabric to feed the fabric.When feeding the fabric, the presser foot is raised.
This prevents the fabric from receiving frictional resistance from the presser foot.
因みに、従来の一般的なミシンでは、生地を押え金で常
に押え付けて生地送り時のずれ防止を図っており、押え
金は生地送り時にも生地に対して押圧姿勢を維持してい
た。例外的に、押え金と上送り歯とが交互に上下して恰
も歩行運動を行うように動作する差動上下歩行送りミシ
ンがあるが、これは押え金のリフト量がlc+n前後と
大きく、厚生地の縫着に対応せんがためのものであり、
薄生地用に適用できない。Incidentally, in conventional general sewing machines, the fabric is always pressed down with a presser foot to prevent the fabric from slipping when the fabric is fed, and the presser foot maintains a pressing position against the fabric even when the fabric is fed. As an exception, there is a differential vertical walking feed sewing machine in which the presser foot and the upper feed dog alternately move up and down to perform a walking motion. It is for sewing materials,
Not applicable to thin fabrics.
上記のように、下針と下送り歯の協同作用で生地送りを
行う前出の従来例では、生地送り時に生地が押え金4か
らの摺接抵抗を受けないので、縫いずれ防止に有効では
ある。As mentioned above, in the prior art example in which the fabric is fed by the cooperative action of the lower needle and the lower feed dog, the fabric does not receive any sliding resistance from the presser foot 4 when feeding the fabric, so it is not effective in preventing sewing errors. be.
しかし、下針の寿命が極端に短い点に最大の難がある。However, the biggest drawback is that the life of the lower needle is extremely short.
業務用の場合、せいぜい1日、良くて2日の寿命である
。しかも生地送り速度を速くできない不利がある。変形
あるいは摩滅した下針で生地が損傷を受けやすい。下針
の刺傷が生地に残って商品価値を低下しやすく、とくに
曲線縫いを行うとき刺傷が目立ちやすい、などの不利が
あった。For commercial use, the lifespan is one day at most, or two days at best. Moreover, there is a disadvantage that the fabric feeding speed cannot be increased. The fabric is easily damaged by a deformed or worn lower needle. There were disadvantages such as the puncture marks of the lower needle tend to remain on the fabric and reduce the product value, and the puncture marks were particularly noticeable when sewing curved lines.
また、上記の従来例では生地送り時に上昇させた押え金
の下降タイミングに問題があった。すなわち、第5図を
参照して説明すると、上糸が引っ張られて縫目に引締力
が作用するG時点から11時点に至る間に、押え金が既
に布地を挟着するよう設定されていた。なぜなら、上送
り歯を備えていない以上、押え金で生地を押さえておか
ない限り、生地の浮き上がりが起きて有効に糸締まり作
用を発揮させることができないからである。そのため、
前記時点(G−H)中も押え金の押圧作用が働いて、と
くに薄生地を縫着する際に生地が縫い縮められる不利が
あった。従って縫着対象がビニール、レザーなどの滑り
の悪い素材、ヘルベソト、別珍などの毛足のある素+4
、メリヤスなどの伸縮性を有する素材、即ち厚生地に特
定されていた。Further, in the above-mentioned conventional example, there was a problem in the lowering timing of the presser foot that was raised during fabric feeding. That is, to explain with reference to FIG. 5, the presser foot was already set to clamp the fabric between point G, when the upper thread is pulled and a tightening force is applied to the seam, and point 11. . This is because, as long as the upper feed dog is not provided, unless the fabric is pressed down with the presser foot, the fabric will lift up and the thread tightening effect cannot be effectively exerted. Therefore,
During the above-mentioned time point (GH), the pressing action of the presser foot continues to work, which disadvantageously causes the fabric to be compressed, especially when sewing thin fabrics. Therefore, the objects to be sewn are non-slip materials such as vinyl and leather, and materials with piles such as Helvesoto and Velveteen +4
, stockinette, and other stretchable materials, that is, welfare fabrics.
これらの生地特性からも判るように、前出の従来例にみ
る押え金は、生地送り時における生地との摩擦抵抗を避
けるためだけに上昇操作されており、前述の歩行送りミ
シンに近似していると言える。As can be seen from these fabric characteristics, the presser foot in the conventional example mentioned above is raised only to avoid frictional resistance with the fabric when feeding the fabric, and is similar to the walk-feed sewing machine described above. I can say that there is.
本発明は、上記に鑑み提案されたものであって、と(に
薄生地の縫着時に、パッカリングや縫いずれなどの縫い
不良が発生することを確実に防止することを目的とする
。The present invention has been proposed in view of the above, and an object of the present invention is to reliably prevent sewing defects such as puckering and misalignment from occurring when sewing thin fabrics.
本発明では、上送り歯5と、これに協同して作動する下
送り歯6と、縫目形成時に生地Wを針板7上に押圧する
押え金4と、生地送り時に押え金4を上昇操作するリフ
ト手段45とをそれぞれを備えた上下送り本縫ミシンに
おいて、上下の両送り歯5・6をこれらの挟持面5a・
6aが針落点Pより生地送り方向下手側で生地Wを挟持
するよう配置し、リフト手段45は少なくとも縫糸に弓
締力が作用する間(G時点から11時点の間)まで押え
金4を上昇姿勢に維持するよう構成したちのである。こ
こでは押え金4の下降タイミングが注目されるべきであ
る。In the present invention, the upper feed dog 5, the lower feed dog 6 that operates in cooperation with the upper feed dog 5, the presser foot 4 that presses the fabric W onto the throat plate 7 when forming stitches, and the presser foot 4 that raises the presser foot 4 when feeding the fabric. In a top and bottom feed lockstitch sewing machine each equipped with a lift means 45 to be operated, both the top and bottom feed dogs 5 and 6 are connected to these clamping surfaces 5a and 5a.
6a is arranged to hold the fabric W on the downstream side of the needle drop point P in the fabric feeding direction, and the lift means 45 holds the presser foot 4 at least until the bow tightening force is applied to the sewing thread (between time G and time 11). It is configured to maintain a rising position. Here, attention should be paid to the lowering timing of the presser foot 4.
更に具体的には、リフト手段45は両送り歯5・6によ
る生地送り時に押え金4をこれが生地Wに対して実質的
に無押圧状態となるよう上昇姿勢に切り換えるためのも
のであり、上送り歯5を送り操作する上送り駆動機構1
に組み込まれていて、下送り歯6の押し上げ操作力で上
送り歯5を介して押え金4を上昇姿勢に維持するよう構
成されている。かかる構成は構造の簡略化につながる。More specifically, the lift means 45 is for switching the presser foot 4 to a raised position so that the presser foot 4 is not substantially pressed against the fabric W when the fabric is fed by the feed dogs 5 and 6; Upper feed drive mechanism 1 that feeds the feed dog 5
It is constructed so that the presser foot 4 is maintained in the raised position via the upper feed dog 5 by the upward force of the lower feed dog 6. Such a configuration leads to a simplified structure.
押え金4側に明けた針孔41には、縫目側から縫針3側
に向かって上り傾斜状に傾く上糸ガイド溝42を形成す
る。また針板7に明けた針通し孔39には、縫目側から
カマ側に向かって傾斜状に傾く下糸ガイド溝40を形成
する。更に天びんを経た直後の上糸の張力は、これが3
0gを丁回ると上糸が下糸を引き上げられなくなり(上
糸が生地裏側に出るようになり)、50gを上回ると所
期の目的を達成することができなくなるので、上糸の張
力は30〜50g程度に設定し、下糸の調子も上糸に合
わせることが望まれる。この数値は長年にわたって縫製
業に携わってきた本発明者の経験から割り出された。In the needle hole 41 opened on the presser foot 4 side, an upper thread guide groove 42 is formed which slopes upward from the stitch side toward the sewing needle 3 side. Further, a lower thread guide groove 40 is formed in the needle through hole 39 formed in the needle plate 7 so as to be inclined from the seam side to the hook side. Furthermore, the tension of the upper thread immediately after passing through the thread take-up is 3.
If it goes just below 0g, the needle thread will not be able to pull up the bobbin thread (the needle thread will come out on the wrong side of the fabric), and if it exceeds 50g, it will not be possible to achieve the desired purpose, so the tension of the needle thread should be 30g. It is desirable to set the weight to about 50g and to match the tension of the lower thread to the upper thread. This value was determined from the experience of the present inventor, who has been involved in the sewing industry for many years.
また本発明のバンカリング防止方法では、上送り歯5、
下送り歯6、押え金4を生地送り時に上昇操作するリフ
ト手段45を備えた上下送り本縫ミシンを用い、針落点
Pより生地送り方向下手側に位置する両送り歯5・6で
生地Wを挟持下で送る一方、両送り歯5・6が生地Wを
挟持するのと同時(D時点)かこれより僅かに遅れた時
点Eから、縫糸に引締力が作用する時点Hまでは、リフ
ト手段45で押え金4を上昇姿勢に維持し続けており、
縫目形成時に押え金4を下降させて押え金4で針板7上
の生地を押圧するものとなっている。Further, in the bunkering prevention method of the present invention, the upper feed dog 5,
Using a vertical feed lockstitch sewing machine equipped with a lift means 45 that lifts the lower feed dog 6 and presser foot 4 when feeding the fabric, both feed dogs 5 and 6 located on the lower side in the fabric feeding direction from the needle drop point P are used to feed the fabric. While feeding W while being held, from time E, which is at the same time as both feed dogs 5 and 6 grip the fabric W (time D) or slightly later than this, to time H when a tightening force is applied to the sewing thread, The lift means 45 continues to maintain the presser foot 4 in the ascending position,
When forming a stitch, the presser foot 4 is lowered to press the fabric on the throat plate 7 with the presser foot 4.
第5図を参照して説明すると、縫目形成後に縫針3が上
死点に至る直前のD時点で下送り歯6がせり上がってく
るとともに、上送り歯5が下降して来て生地Wを挟着し
、同時に下送り歯6で上送り歯5が持ち上げられるのに
連動してリフト手段45で押え金4が持ち上げられる。To explain with reference to FIG. 5, at point D, just before the sewing needle 3 reaches the top dead center after stitch formation, the lower feed dog 6 rises and the upper feed dog 5 descends, causing the fabric W At the same time, as the upper feed dog 5 is lifted by the lower feed dog 6, the presser foot 4 is lifted by the lift means 45.
つまり、上下の送り歯5・6の生地送り期間中は押え金
4が上昇姿勢にあって、生地Wを実質的に押圧していな
い。更に天びんが上死点に至る直前のG時点から縫糸に
引締力が作用するが、この引締力が作用する間(G−1
1時点)も、上下の送り歯5・6で生地Wを挟着したう
えで、押え金4は上昇姿勢を維持し続けており、従って
生地にこれを縮度形さ−Uるような引締力が作用しない
。In other words, while the upper and lower feed dogs 5 and 6 are feeding the fabric, the presser foot 4 is in a raised position and does not substantially press the fabric W. Furthermore, a tightening force is applied to the sewing thread from point G just before the take-up reaches the top dead center, but while this tightening force is acting (G-1
At point 1), the upper and lower feed dogs 5 and 6 clamp the fabric W, and the presser foot 4 continues to maintain the upward position, thus tightening the fabric to give it a contracted shape. No force acts.
針落点Pより生地送り方向下手側に上下の送り歯5・6
を配置したのは、縫着後の生地Wを引っ張る要領で送り
、上下の生地に縫いずれが生じるのを防止し、かつ既に
形成された縫目が縫糸の引締力により引き戻されて生地
Wに縫い縮みが生じるのを防止するためである。この点
は両送り歯5・6が針落点Pより生地送り方向上手側に
位置して、生地Wを突き押し出す方式と比較すれば、よ
り一層明らかとなる筈である。Upper and lower feed dogs 5 and 6 are located below the needle drop point P in the material feed direction.
The reason for this arrangement is to feed the fabric W after sewing in a pulling manner, to prevent misalignment of the upper and lower fabrics, and to prevent the already formed seams from being pulled back by the tightening force of the sewing thread to the fabric W. This is to prevent seam shrinkage from occurring. This point will become clearer if compared with a method in which both feed dogs 5 and 6 are positioned above the needle drop point P in the material feeding direction and push out the material W.
第1図ないし第5図は本発明に係る上下送り本縫ミシン
の実施例を示す。1 to 5 show an embodiment of a vertical feed lockstitch sewing machine according to the present invention.
第2図において、■は上送り駆動機構、2は針棒□、3
は縫針、4は押え金、5は上送り歯、6は下送り歯、7
は針板である。In Fig. 2, ■ is the upper feed drive mechanism, 2 is the needle bar □, 3
is the sewing needle, 4 is the presser foot, 5 is the upper feed dog, 6 is the lower feed dog, 7
is the needle plate.
上送り駆動機構lは、上送り歯5に上下動作を与える上
下動手段IAと、上送り歯5に前後動作を与える前後動
手段IBと、上送り歯5および押え金4を下降付勢する
プレッシャ手段iCとを含む。これら各手段IA−IB
−1cの協同作用で上送り歯5は楕円状の軌跡に沿って
駆動される。The upper feed drive mechanism 1 includes a vertical movement means IA that gives the upper feed dog 5 a vertical movement, a back and forth movement means IB that gives the upper feed dog 5 a back and forth movement, and biases the upper feed dog 5 and the presser foot 4 downward. pressure means iC. Each of these means IA-IB
-1c, the upper feed dog 5 is driven along an elliptical trajectory.
上下動手段IAは、上下レバー9と上中間リンク10と
、ベルクランク状のフォークレバー11などを含む。押
え棒12の下端のブラケット13にピン14を介して揺
動可動に支持したフォークレバー11が、上中間リンク
10を介して上下レバー9で上下操作される。フォーク
レバー11の一端に操作フォーク15を有する。The vertical movement means IA includes a vertical lever 9, an upper intermediate link 10, a bell crank-shaped fork lever 11, and the like. A fork lever 11 swingably supported by a bracket 13 at the lower end of a presser bar 12 via a pin 14 is vertically operated by a vertical lever 9 via an upper intermediate link 10. The fork lever 11 has an operating fork 15 at one end.
前後動手段lBは、前後動用レバー17と、下中間リン
ク18と、上歯ホルダ19と、ブラケット13に揺動可
能に支持した支えレバー20などを含む。下中間リンク
18、上歯ホルダ19および支えレバー20は、ピン2
1を共通軸にして連結する。上歯ホルダ19の突端上部
に一対のブラケットを立設し、両ブラケット間にローラ
22を遊転自在に支持し、これを前記フォークレバー1
1の操作フォーク15で相対移動可能に保合支持する。The longitudinal movement means IB includes a longitudinal movement lever 17, a lower intermediate link 18, an upper tooth holder 19, a support lever 20 swingably supported by the bracket 13, and the like. The lower intermediate link 18, the upper tooth holder 19 and the support lever 20 are connected to the pin 2
Connect using 1 as a common axis. A pair of brackets is provided upright on the upper part of the tip of the upper tooth holder 19, and a roller 22 is freely rotatably supported between the brackets, and this is connected to the fork lever 1.
It is held and supported in a relatively movable manner by one operation fork 15.
かくして、上下動手段IAの動作は操作フォーク15か
らローラ22を介して上歯ホルダ19に伝わり、その下
面に固定した上送り歯5の姿勢を前後動手段IBの出力
動作と協同して制御する。In this way, the operation of the vertical movement means IA is transmitted from the operation fork 15 to the upper tooth holder 19 via the roller 22, and the posture of the upper feed dog 5 fixed to the lower surface thereof is controlled in cooperation with the output operation of the longitudinal movement means IB. .
プレッシャ手段ICはアーム24の固定壁に支持した縦
長のブツシュ25と、ブツシュ25内に通した前記押え
棒12と、押え棒12の下端内部に昇降自在に支持した
タペット体26と、押え棒12内に挿通されてタペット
体26に連接するプ・7シユロソド27と、これらを付
勢するばね手段などで構成する。The pressure means IC includes a vertically long bushing 25 supported on the fixed wall of the arm 24, the presser rod 12 passed through the bushing 25, a tappet body 26 supported inside the lower end of the presser rod 12 so as to be movable up and down, and the presser rod 12. It consists of a push rod 27 inserted into the tappet body 26 and connected to the tappet body 26, and spring means for biasing these.
押え棒12はブツシュ25に昇降自在に支持されており
、図外の操作レバーを切換え操作することによって、上
方の待機姿勢と下降した作動姿勢とに手動で切換え操作
できる。この押え棒の下端に押え金4が装着されている
。押え金4の手動切換え手段は図示省略したが公知のそ
れと同してある。The presser bar 12 is supported by a bushing 25 so as to be movable up and down, and can be manually switched between an upper standby position and a lowered operating position by switching an operating lever (not shown). A presser foot 4 is attached to the lower end of this presser bar. Although the manual switching means for the presser foot 4 is not shown, it is the same as known means.
作動姿勢において押え金4を生地を挟んで針板7に圧着
させるために、押え棒12の上端にはフレーム側に上下
摺動自在に支持したばね受腕28を固定し、これを押え
金ばね29で下向きに押し下げ付勢しておく。このばね
29のばね圧はアーム24の上壁に装着した調節ねじ3
0で調節できる。押え金4の押圧力は従来一般に5〜6
kgfに設定されていたが、ここでは2.2〜3kgf
と極端に弱く設定しておく。In order to press the presser foot 4 to the needle plate 7 with the fabric in between in the operating position, a spring receiving arm 28 supported on the frame side so as to be vertically slidable is fixed to the upper end of the presser foot 12, and this is connected to the presser foot spring. Press 29 downward to apply pressure. The spring pressure of this spring 29 is determined by the adjustment screw 3 attached to the upper wall of the arm 24.
It can be adjusted at 0. Conventionally, the pressing force of the presser foot 4 is generally 5 to 6.
kgf, but here it is 2.2 to 3 kgf.
Set it extremely weakly.
上送り歯5に適切な挟持圧力を付与するために、プユソ
シュロソド27の上端に、片持ち支持した板ばね31の
先端が接当作用している。この板ばね31のばね圧も調
節ねじ32で調整できる。本発明では上下の送り歯5・
6だけで生地送りを行う必要上、この板ばね31は通常
よりやや大きなばね力を生じるよう設定しておく。In order to apply appropriate clamping pressure to the upper feed dog 5, the tip of a cantilevered leaf spring 31 is brought into contact with the upper end of the push rod 27. The spring pressure of this leaf spring 31 can also be adjusted with an adjusting screw 32. In the present invention, the upper and lower feed teeth 5.
Since it is necessary to feed the fabric using only the spring 6, the leaf spring 31 is set to generate a slightly larger spring force than usual.
前記板ばね31とは別に、タペット体26を押し下げ付
勢する同調ばね33を備えている。この同調ばね33は
押え棒12の内部に仕込んであり、タペット体26の上
端と、押え棒12の上端にねじ込み固定したプラグ34
との間に介装する。この同調ばね33は操作フォーク1
5をローラ22に圧接させ、操作フォーク15の上下動
作にタペット体26を確実に追随させる役目を果たす。Separately from the leaf spring 31, a synchronized spring 33 is provided which presses down and urges the tappet body 26. This synchronized spring 33 is installed inside the presser bar 12, and a plug 34 is screwed and fixed to the upper end of the tappet body 26 and the upper end of the presser bar 12.
Interpose between. This synchronized spring 33 is connected to the operating fork 1
5 is brought into pressure contact with the roller 22, and serves to ensure that the tappet body 26 follows the vertical movement of the operating fork 15.
下送り歯6はベツド36に内蔵した公知の駆動機構で楕
円軌跡に沿って駆動され、上送り歯5と協同して生地W
を送り操作する。上送り歯5が下送り歯6に生地Wを介
して接当した後、送り操作が終了するまでの間、−ヒ送
り歯5は下送り歯6例の楕円軌跡に追従するよう動く。The lower feed dog 6 is driven along an elliptical trajectory by a known drive mechanism built into the bed 36, and cooperates with the upper feed dog 5 to feed the fabric W.
Send and operate. After the upper feed dog 5 contacts the lower feed dog 6 via the material W, the -hi feed dog 5 moves to follow the elliptical trajectory of the lower feed dog 6 until the feeding operation is completed.
つまり、生地送り動作中は下送り歯6に突き上げられた
状態となり、このとき上送り歯5に作用する板ばね31
および同調ばね33のばね圧によって生地Wを強固に挟
め固定する。In other words, during the dough feeding operation, the leaf spring 31 is pushed up against the lower feed dog 6, and at this time the leaf spring 31 acting on the upper feed dog 5
The fabric W is firmly clamped and fixed by the spring pressure of the synchronized spring 33.
第3図において、下送り歯6の上面には、生地送り方向
と平行な2個の長い挟持面6b・6bと、これら両挟持
面6b・6bの中央で生地送り方向下手側に位置する短
寸の挟持面6aとが設けられている。In FIG. 3, on the upper surface of the lower feed dog 6, there are two long clamping surfaces 6b, 6b parallel to the fabric feeding direction, and a short one located at the center of these clamping surfaces 6b, 6b on the lower side in the fabric feeding direction. A clamping surface 6a of approximately 300 mm is provided.
生地Wの挟持および送り動作は、実質的に短寸の挟持面
6aと上送り歯5の挟持面5aとで行う。The clamping and feeding operations of the dough W are performed by the substantially short clamping surface 6a and the clamping surface 5a of the upper feed dog 5.
両者の挟持面5a・6aは、第4図に示すごとく針落点
Pより生地送り方向下手側に位置しており、しかも針落
点Pにできるだけ近い位置で生地Wを挟持している点が
注目されるべきである。これは薄生地を引っ張る要領で
確実に送るのに有効である。As shown in FIG. 4, the clamping surfaces 5a and 6a of the two are located on the lower side of the needle drop point P in the fabric feeding direction, and the clamping surfaces 5a and 6a of the two clamp the fabric W at a position as close as possible to the needle drop point P. It deserves attention. This is effective for reliably feeding thin fabrics by pulling them.
針板7の板面には、下送り歯6の挟持面6a・6bに対
応する送り窓37・37・38を明りてあり、更に中央
の送り窓38と隣接する位置に針通し孔39を明けであ
る。The plate surface of the throat plate 7 is provided with feed windows 37, 37, 38 corresponding to the clamping surfaces 6a, 6b of the lower feed dog 6, and a needle through hole 39 is provided at a position adjacent to the center feed window 38. It's dawn.
この針通し孔39の生地送り方向下手側における上面開
口縁部分には、第4図に示すごとく縫目側からベツド3
6の内部のカマ側に向かって下り傾斜状に傾く下糸ガイ
ド溝40を形成し、生地送り時の下糸の摺接抵抗による
糸締まりを防止している。As shown in FIG.
A bobbin thread guide groove 40 is formed which is inclined downwardly toward the hook side inside the bobbin thread 6 to prevent thread tightening due to sliding resistance of the bobbin thread when feeding the fabric.
押え金4の針孔41にも同趣旨の上糸ガイド溝42を形
成する。具体的には、縫目側から縫針3側に向かって上
り傾斜状に傾くよう上糸ガイド溝42を形成する。第4
図において符号43は押え金4に形成された上送り歯5
の遊嵌用の動作溝である。An upper thread guide groove 42 having the same purpose is also formed in the needle hole 41 of the presser foot 4. Specifically, the needle thread guide groove 42 is formed so as to be inclined upwardly from the stitch side toward the sewing needle 3 side. Fourth
In the figure, reference numeral 43 indicates an upper feed tooth 5 formed on the presser foot 4.
This is an operating groove for loose fitting.
縫目に引締力が作用するのを避けるために、押え金4を
上昇操作するリフト手段45を有する。In order to avoid applying a tightening force to the seams, a lifting means 45 is provided for lifting the presser foot 4.
このリフト手段45は上送り駆動機構1中に組み込まれ
ている。つまり、上送り歯5が下送り歯6と協同して生
地Wを挟持した状態で、押え金4が上昇するよう上送り
駆動機構1を構成してある。This lift means 45 is incorporated into the upper feed drive mechanism 1. That is, the upper feed drive mechanism 1 is configured so that the presser foot 4 is raised while the upper feed dog 5 cooperates with the lower feed dog 6 to clamp the fabric W.
すなわち、上送り歯5が生地Wを介して下送り歯6.に
接当すると、上送り歯5は下送り歯6で押し上げられ、
同時にタペット体26が操作フォーク15で同調ばね3
3に抗して押し上げられる。That is, the upper feed dog 5 passes through the material W to the lower feed dog 6. , the upper feed dog 5 is pushed up by the lower feed dog 6,
At the same time, the tappet body 26 is operated by the operating fork 15 to release the tuning spring 3.
It is pushed up against 3.
すると、同調ばね33のばね圧が増加し、このばね圧は
プラグ34を介して押え棒12に上向きに作用する。こ
のとき、押え金4に作用する押え金ばね29のばね圧は
2.5〜3kgfと弱く設定してあるため、同調ばね3
3のばね圧が押え金ばね29のばね圧より高くなり、押
え棒12を介し−で押え金4を上昇移動させるのである
。Then, the spring pressure of the tuning spring 33 increases, and this spring pressure acts upwardly on the presser bar 12 via the plug 34. At this time, since the spring pressure of the presser foot spring 29 acting on the presser foot 4 is set to be weak at 2.5 to 3 kgf, the synchronized spring 3
3 becomes higher than the spring pressure of the presser foot spring 29, and the presser foot 4 is moved upward via the presser bar 12.
押え金4は生地送りが終了するまで上昇姿勢に維持され
ており、この上昇姿勢では押え金4が生地Wを実質的に
押圧作用していない。The presser foot 4 is maintained in the raised position until the fabric feeding is completed, and in this raised position, the presser foot 4 does not substantially press the fabric W.
このように上下送り歯5・6による生地Wの捕捉と同時
に、押え金4が生地Wから浮き離れるよう上送り駆動機
構lを構成したものである。押え金4の上昇量は、縫着
前の自由状態時の生地Wの厚みと同じか、これよ、り僅
かに小さく設定してあり、第4図に示す生地送り時にお
いて、押え金4は支軸46まわりに上下傾動できる。In this way, the upper feed drive mechanism 1 is configured so that the presser foot 4 floats away from the fabric W at the same time as the fabric W is captured by the upper and lower feed dogs 5 and 6. The amount of rise of the presser foot 4 is set to be the same as the thickness of the fabric W in the free state before sewing, or slightly smaller than this, and when the fabric is fed as shown in FIG. It can be tilted up and down around the support shaft 46.
第5図は天びん、縫針3、押え金4および−L下の送り
歯5・6の関連動作を示す。これは縫針3が下死点にあ
るA時点を出発点にして、前記各部材の生地Wに対する
3時点までのワンサイクルの上下動作を示しており、図
に向かって左向きに時間が進行する。各時点間の時間間
隔は必ずしも同じではない。なお、天ぴんと縫針との動
作タイミングは従来公知のそれと同じである。FIG. 5 shows the related operations of the thread take-up, sewing needle 3, presser foot 4, and feed dogs 5 and 6 below -L. This shows a one-cycle vertical movement of each member relative to the fabric W up to three points starting from point A when the sewing needle 3 is at the bottom dead center, and time progresses to the left in the figure. The time intervals between each time point are not necessarily the same. Incidentally, the timing of operation of the balance pin and the sewing needle is the same as that of the conventionally known one.
このタイミング表から判るように、天びんが下死点(縫
針3が上死点に至る少し前のD時点)から僅かに上昇し
たE時点(このとき縫針3は上死点にある)の間におい
て、上送り歯5が下送り歯6で押し上げられ、押え金4
は生地Wがら浮き離れる。この押え金4が上昇している
間に上下の送り歯5・6による生地送りが行われる。As can be seen from this timing table, between the time when the balance has risen slightly from the bottom dead center (point D, which is a little before the sewing needle 3 reaches the top dead center) and the point E (at this time, the sewing needle 3 is at the top dead center). , the upper feed dog 5 is pushed up by the lower feed dog 6, and the presser foot 4
will float away from the fabric W. While the presser foot 4 is rising, the fabric is fed by the upper and lower feed dogs 5 and 6.
次に天びんが上死点(11時点)から僅かに下降した1
時点で、上送り歯5は下送り歯6がら離れて、今度は押
え金4が生地Wに押し付けられ、次の縫目形成に備える
。Next, the balance descended slightly from top dead center (point 11).
At this point, the upper feed dog 5 is separated from the lower feed dog 6, and the presser foot 4 is now pressed against the fabric W in preparation for forming the next stitch.
縫糸の引締めは、天びんが上死点に達する直前の0時点
から上死点に来た11時点との間で行われる。この11
時点でも押え金4はリフト手段45で上昇操作されたま
まにあり、生地Wから浮き離れている。The sewing thread is tightened between time 0, just before the balance reaches the top dead center, and time 11, when the balance reaches the top dead center. This 11
Even at this point, the presser foot 4 is still being lifted by the lift means 45, and is floating away from the fabric W.
従って、縫糸に引締力が作用すると、押え金4は支軸4
6を中心にして、生地送り方向上手側の先端を上にして
傾動する傾向を生じ、同時に上下の送り歯5・6で挟持
されている生地Wも押え金4の傾動に沿って僅かに浮き
上がり、縫目に過剰な引締力が作用するのを避ける。し
かも、天びんを経た上糸の張力は30〜50g、現実に
は40g前後に調整してあり、下糸の張力もそれに合わ
せである。その結果、縫糸によって生地Wが引き縮めら
れることはなく、バンカリング防止に有効となる。この
とき、縫目を形成する縫糸は殆ど張力を生じない状態に
なっており、とくに皺加工が施された薄生地を縫着する
場合でも、これら相まってパッカリングが発生すること
はない。また、既に形成された縫目まわりを上下の両送
り歯5・6で挟持し、針落点Pより送り方向下手側へ生
地Wを引っ張って生地送りを行うので、上下の生地間に
縫いずれが生じるのを防止できるのはもちろんのこと、
縫目が縫糸の引締力で縫針3側に引き戻されるのを防止
して、縫目で挟まれた生地部分が引き縮められるのもよ
く防止する。Therefore, when a tightening force is applied to the sewing thread, the presser foot 4
6, the fabric tends to tilt with the upper end in the fabric feeding direction facing upwards, and at the same time, the fabric W held between the upper and lower feed dogs 5 and 6 also slightly rises along with the tilting of the presser foot 4. , avoid applying excessive tightening force to the seams. Moreover, the tension of the upper thread after passing through the thread take-up is adjusted to 30 to 50 g, in reality around 40 g, and the tension of the lower thread is adjusted accordingly. As a result, the fabric W is not stretched and shrunk by the sewing thread, which is effective in preventing bunkering. At this time, the sewing thread forming the seam is in a state where almost no tension is generated, and in combination, puckering does not occur, especially when sewing a wrinkled thin fabric. In addition, since the fabric W is fed by holding the area around the already formed seam between the upper and lower feed dogs 5 and 6 and pulling the fabric W downward in the feeding direction from the needle drop point P, there is no possibility of sewing between the upper and lower fabrics. Not only can it prevent the occurrence of
The stitches are prevented from being pulled back toward the sewing needle 3 side by the tightening force of the sewing thread, and the fabric portion sandwiched between the stitches is also prevented from being stretched.
上記の上下送り本縫いミシンによって、種々の薄生地の
縫着を行ったが、いずれの場合も高品位の縫製を行うこ
とができた。以下に縫着例のひとつを示す。Various thin fabrics were sewn using the above-mentioned top-feed lockstitch sewing machine, and high-quality sewing was possible in all cases. An example of sewing is shown below.
2枚合わせの使用生地厚み (0,5mm )生地材
質 (絹 )(ポリエステル)
押え金押圧力 (2,5kgf)
押え金リフト量(針板表面からO,’7mm)上糸張力
(天・びんの下方において40g)下糸張力 (中ガ
マ部において35g)〔別実施例〕
上記の実施例では、上送り駆動機構1がリフト手段45
を兼ねるように構成したが、例えば押え棒12をカムで
上昇操作して押え金4の押圧力を解除するようにしても
よい。Thickness of the fabric used when combining two pieces (0.5 mm) Fabric material (silk) (polyester) Presser foot pressing force (2.5 kgf) Presser foot lift amount (O, '7 mm from the needle plate surface) Needle thread tension (taken/bottle) (40 g at the lower part of the bobbin thread tension) (35 g at the middle part) [Another embodiment] In the above embodiment, the upper feed drive mechanism 1 is
However, for example, the pressing force of the presser foot 4 may be released by lifting the presser bar 12 with a cam.
本発明では、天びんによって少なくとも縫糸が引線めら
れている間(G−11時点)までは押え金4がリフト手
段45で生地面から浮き離れているので、縫目に過剰な
引締力が作用するのを避けて、縫糸によって生地Wが引
き縮められることを確実に阻止できる。In the present invention, since the presser foot 4 is lifted off the fabric surface by the lift means 45 at least until the sewing thread is drawn by the thread take-up (time point G-11), excessive tightening force is applied to the seam. By avoiding this, it is possible to reliably prevent the cloth W from being stretched by the sewing thread.
針落点Pより生地送り方向下手側において、上下の送り
歯5・6で縫着後の生地Wを引っ張り操作して生地送り
を行い、かつ押え金4による生地W′への押圧力が解除
されているので、上下の生地が生地送り方向にずれ動く
ことを防止でき、しかも既に形成された縫目が縫糸の引
締力で引き戻されて、縫目に挟まれた生地部分に縫い縮
みが生じるのを防止できる。On the downstream side of the needle drop point P in the fabric feeding direction, the fabric is fed by pulling the sewn fabric W with the upper and lower feed dogs 5 and 6, and the pressing force on the fabric W' by the presser foot 4 is released. This prevents the upper and lower fabrics from shifting in the fabric feeding direction, and the already formed seams are pulled back by the tightening force of the sewing thread, causing the part of the fabric caught between the seams to shrink. can be prevented.
従って本発明によれば、パッカリングや縫いずれなどの
縫い不良を完全に解消して、薄生地の縫製を確実に行う
ことができ、しかもその縫製品位を高度化して商品価値
の向上を期し得る。天びんを経た直後の上糸の張力を3
0〜50gに設定し、下糸の張力もそれに合うようにし
ておけば、かかる効果は更に有効に発揮されよう。Therefore, according to the present invention, sewing defects such as puckering and misalignment can be completely eliminated and thin fabrics can be sewn reliably, and the quality of the sewing can be improved to improve the product value. . The tension of the upper thread immediately after passing through the thread take-up is 3.
If the tension is set to 0 to 50 g and the tension of the bobbin thread is adjusted accordingly, this effect will be more effectively exhibited.
また、請求項2記載の本発明によれば、押え金4のリフ
ト手段45は上送り歯5の上送り駆動機構1中に組み込
まれており、かつ下送り歯6による上送り歯5の突き上
げ操作力を利用して押え金4を上昇させるものとしたの
で、構成部材の共用で構造の簡略化と作動の確実性とを
図れる利点を有する。Further, according to the present invention as set forth in claim 2, the lifting means 45 of the presser foot 4 is incorporated in the upper feed drive mechanism 1 of the upper feed dog 5, and the upper feed dog 5 is pushed up by the lower feed dog 6. Since the presser foot 4 is raised using the operating force, there is an advantage that the structure can be simplified and the operation can be ensured by sharing the same constituent members.
第1図ないし第5図は本発明に係るミシンを例示してお
り、
第1図は要部の概略縦断側面図、
第2図は上送り駆動機構とその周辺構造を示す一部切り
欠き縦断側面図、
第3図は針板まわりの平面図、
第4図は第3図におけるA−A線断面図、第5図は動作
タイミング表である。
1・・・・・上送り駆動機構、
3・・・・・縫針、
4・・・・・押え金、
5・・・・・上送り歯、
5a・・・・上送り歯の挟持面、
6・・・・・下送り歯、
6a・・・・下送り歯の挟持面、
7・・・・・針板、
39・・・・針通し孔、
40・・・・下糸ガイド溝、
41・・・・針孔、
42・・・・上糸ガイド溝、
45・・・・リフト手段、
P・・・・・針落点、
W・・・・・生地。Figures 1 to 5 illustrate the sewing machine according to the present invention, with Figure 1 being a schematic longitudinal sectional side view of the main parts, and Figure 2 being a partially cutaway longitudinal sectional view showing the upper feed drive mechanism and its surrounding structure. A side view, FIG. 3 is a plan view around the throat plate, FIG. 4 is a sectional view taken along line A--A in FIG. 3, and FIG. 5 is an operation timing table. 1... Upper feed drive mechanism, 3... Sewing needle, 4... Presser foot, 5... Upper feed dog, 5a... Upper feed dog clamping surface, 6... Lower feed dog, 6a... Lower feed dog clamping surface, 7... Throat plate, 39... Needle through hole, 40... Lower thread guide groove, 41... Needle hole, 42... Needle thread guide groove, 45... Lifting means, P... Needle drop point, W... Fabric.
Claims (1)
生地送り時に押え金(4)を上昇操作するリフト手段(
45)を備えており、 上下の送り歯(5・6)は、これらの挟持面(5a・6
a)が針落点(P)より生地送り方向下手側で生地(W
)を挟持するよう配置してあり、リフト手段(45)は
、少なくとも縫糸に引締力が作用する時点(G時点から
11時点の間)まで押え金(4)を上昇姿勢に維持する
よう構成してある上下送り本縫ミシン。 2、上送り歯(5)と、これに協同して作動する下送り
歯(6)と、縫目形成時に生地(W)を針板(7)上に
押圧する押え金(4)とをそれぞれ備えており、 上下の送り歯(5・6)は、これらの挟持面(5a・6
a)が針落点(P)より生地送り方向下手側で生地(W
)を挟持するよう配置してあり、両送り歯(5・6)に
よる生地送り時には、押え金(4)をこれが生地(W)
に対して実質的に無押圧状態となるよう上昇姿勢に切り
換えるリフト手段(45)を備えており、 リフト手段(45)は、上送り歯(5)を送り操作する
上送り駆動機構1に組み込まれており、かつ、リフト手
段(45)は、下送り歯(6)の押し上げ操作力で上送
り歯(5)を介して押え金(4)を上昇姿勢に維持する
よう構成されている上下送り本縫ミシン。 3、天びんを経た直後の上糸の張力が、30〜50gに
設定されている請求項1又は2記載の上下送り本縫ミシ
ン。 4、押え金(4)に明けた針孔(41)が、縫目側から
縫針(3)側に向かって上り傾斜状に傾く上糸ガイド溝
(42)を含み、 かつ針板(7)に明けた針通し孔(39)が、縫目側か
らカマ側に向かって下り傾斜状に傾く下糸ガイド溝(4
0)を含む請求項1又は2記載の上下送り本縫ミシン。 5、上送り歯(5)、下送り歯(6)、押え金(4)生
地送り時に押え金(4)を上昇操作するリフト手段(4
5)を備えた上下送り本縫ミシンを用いて、 針落点(P)より生地送り方向下手側に位置する両送り
歯(5・6)で生地(W)を挟持下で送り、 両送り歯(5・6)が生地(W)を挟持するのと同時(
D時点)かこれより僅かに遅れた時点(E)から、縫糸
に引締力が作用する時点(H)までは、リフト手段45
で押え金4を上昇姿勢に維持し続け、 縫目形成時に押え金4で生地(W)を針板7上に押圧す
る、上下送り本縫ミシンにおけるパッカリング防止方法
。[Claims] 1. Upper feed dog (5), lower feed dog (6), presser foot (4),
Lifting means (for lifting the presser foot (4) when feeding the fabric
45), and the upper and lower feed dogs (5, 6) are provided with these clamping surfaces (5a, 6).
a) is on the lower side of the needle drop point (P) in the fabric feeding direction.
), and the lift means (45) is configured to maintain the presser foot (4) in the raised position at least until a tightening force is applied to the sewing thread (between time G and time 11). A top and bottom feed lockstitch sewing machine. 2. An upper feed dog (5), a lower feed dog (6) that operates in cooperation with the upper feed dog, and a presser foot (4) that presses the fabric (W) onto the throat plate (7) during stitch formation. The upper and lower feed dogs (5 and 6) are attached to these clamping surfaces (5a and 6).
a) is on the lower side of the needle drop point (P) in the fabric feeding direction.
), and when feeding the fabric using both feed dogs (5, 6), the presser foot (4) is placed so as to hold the fabric (W).
The lift means (45) is equipped with a lift means (45) that switches to a raised position so that the upper feed dog (5) is not pressed substantially. and the lift means (45) is configured to maintain the presser foot (4) in a raised position via the upper feed dog (5) by the upward force of the lower feed dog (6). Feed lockstitch sewing machine. 3. The vertical feed lockstitch sewing machine according to claim 1 or 2, wherein the tension of the upper thread immediately after passing through the thread take-up is set to 30 to 50 g. 4. The needle hole (41) drilled in the presser foot (4) includes an upper thread guide groove (42) that slopes upward from the stitch side toward the sewing needle (3) side, and the needle plate (7) The needle threading hole (39) formed in the lower thread guide groove (4) slopes downward from the seam side to the hook side.
The vertical feed lockstitch sewing machine according to claim 1 or 2, comprising: 0). 5. Upper feed dog (5), lower feed dog (6), presser foot (4) Lift means (4) for lifting the presser foot (4) when feeding the fabric.
Using a top and bottom feed lockstitch sewing machine equipped with 5), the fabric (W) is fed while being held between the two feed dogs (5 and 6) located on the downside in the fabric feeding direction from the needle drop point (P), and the fabric (W) is fed in both feeds. At the same time as the teeth (5, 6) clamp the fabric (W) (
The lift means 45
A method for preventing puckering in a vertical feed lockstitch sewing machine, in which the presser foot 4 is kept in a raised position with the presser foot 4, and the fabric (W) is pressed onto the throat plate 7 with the presser foot 4 during stitch formation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63304752A JPH0815513B2 (en) | 1988-11-30 | 1988-11-30 | Vertical feed lockstitch machine and puckering prevention method for vertical feed lockstitch machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63304752A JPH0815513B2 (en) | 1988-11-30 | 1988-11-30 | Vertical feed lockstitch machine and puckering prevention method for vertical feed lockstitch machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02149289A true JPH02149289A (en) | 1990-06-07 |
JPH0815513B2 JPH0815513B2 (en) | 1996-02-21 |
Family
ID=17936799
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63304752A Expired - Lifetime JPH0815513B2 (en) | 1988-11-30 | 1988-11-30 | Vertical feed lockstitch machine and puckering prevention method for vertical feed lockstitch machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0815513B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015142657A (en) * | 2014-01-31 | 2015-08-06 | トヨタ紡織株式会社 | Integrated feed sewing machine |
JP2016123781A (en) * | 2015-01-07 | 2016-07-11 | 極東産機株式会社 | Sewing needle guide mechanism of tatami sewing apparatus and tatami sewing apparatus including sewing needle guide mechanism |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITVR20110110A1 (en) * | 2011-05-20 | 2012-11-21 | Vi Be Mac Spa | PREMISTOFFA DEVICE AND SEWING MACHINE INCLUDING THIS DEVICE |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6057366U (en) * | 1983-09-26 | 1985-04-22 | ジューキ株式会社 | Presser foot lift reduction device for presser foot in top feed sewing machine |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6057366B2 (en) * | 1979-09-12 | 1985-12-14 | 株式会社日立製作所 | centrifugation method |
-
1988
- 1988-11-30 JP JP63304752A patent/JPH0815513B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6057366U (en) * | 1983-09-26 | 1985-04-22 | ジューキ株式会社 | Presser foot lift reduction device for presser foot in top feed sewing machine |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015142657A (en) * | 2014-01-31 | 2015-08-06 | トヨタ紡織株式会社 | Integrated feed sewing machine |
JP2016123781A (en) * | 2015-01-07 | 2016-07-11 | 極東産機株式会社 | Sewing needle guide mechanism of tatami sewing apparatus and tatami sewing apparatus including sewing needle guide mechanism |
Also Published As
Publication number | Publication date |
---|---|
JPH0815513B2 (en) | 1996-02-21 |
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