JPH02274284A - Needle thread winding mechanism of safe sewing machine - Google Patents
Needle thread winding mechanism of safe sewing machineInfo
- Publication number
- JPH02274284A JPH02274284A JP9829189A JP9829189A JPH02274284A JP H02274284 A JPH02274284 A JP H02274284A JP 9829189 A JP9829189 A JP 9829189A JP 9829189 A JP9829189 A JP 9829189A JP H02274284 A JPH02274284 A JP H02274284A
- Authority
- JP
- Japan
- Prior art keywords
- thread
- needle
- needle thread
- sewing machine
- cam
- 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 26
- 238000004804 winding Methods 0.000 title abstract description 4
- 210000003128 head Anatomy 0.000 abstract 2
- 239000004744 fabric Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 241000270923 Hesperostipa comata Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013589 supplement Substances 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、二重環縫いと縁かシリ縫いを並行して行う安
全縫いミシンの二重環縫い用針糸に作用する針糸繰り機
構に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a needle thread take-up mechanism that acts on a double chain stitch needle thread of a safety stitch sewing machine that performs double chain stitches and edge hem stitches in parallel.
従来技術
二重環縫い用の針糸に対しては、従来、針棒に取着され
る針糸案内と、ミシンのアームに設けられる針糸道とか
らなる針糸さばきがミシン針と糸調子器との間に設置さ
れ、針棒に伴って上下動する針糸案内により針糸が針糸
道で屈折して張力が与えられ、糸繰り制御を行うように
なっている。Conventional technology Conventionally, the needle thread for double chainstitching is controlled by the sewing machine needle and thread tension, which consists of a needle thread guide attached to the needle bar and a needle thread path provided on the arm of the sewing machine. The needle thread guide is installed between the needle bar and the needle bar and moves up and down along with the needle bar.The needle thread is bent in the needle thread path and tension is applied to the needle thread guide, thereby controlling thread reeling.
発明が解決しようとする課題
針糸捌きによる糸繰り量は、糸や布の性質、運針数など
縫製条件によって調節する必要がある。Problems to be Solved by the Invention The amount of thread taken up by needle thread handling must be adjusted depending on sewing conditions such as the properties of the thread or cloth and the number of stitches.
例えば運針が細かい場合や薄い布の場合、針糸消費量が
少ないため針糸に弛みを生じ易く、そのためルーパにか
＼る針糸ループがルーパの先端側に移動して針が三角形
の外側に降下する、いわゆる半抜は現象を生じ易くなり
、また低速の場合、ことにルーパ糸が弛みがちで、必要
な三角形を正しく形成されなくなり、空環も生じにく＼
なる。そこで従来の針糸さばきでは針糸案内や針糸道の
上下位置を調整できるようにして上記のような場合には
、針糸道を上げて針糸の屈折量を増やし、以って糸繰り
量を増加させて糸弛みを吸収していたが、このような方
法では、早抜けを防止することができても針が三角形の
中に降下して針糸に弛みが必要になったときにも針糸に
不要なテンションがか−るため糸切れが起り易く、また
このとき糸調子器から針糸が引出されるので、針糸綿り
が悪くなる。その結果、針糸綿りに伴って生ずるルーパ
糸のルーパからの引出しも少なくなり、風合いの悪い縫
い目が形成されるようになる。For example, when the needle movement is fine or when the fabric is thin, the needle thread tends to become slack because the amount of needle thread consumed is small, and the needle thread loop attached to the looper moves toward the tip of the looper, causing the needle to move outside the triangle. Descending, so-called half-pulling, tends to cause problems, and at low speeds, the looper thread tends to loosen, making it difficult to form the necessary triangle correctly and creating a hollow ring.
Become. Therefore, in conventional needle thread handling, the needle thread guide and the vertical position of the needle thread path can be adjusted. However, although this method can prevent premature pull-out, it also prevents the thread from coming off quickly when the needle descends into the triangle and the needle thread needs to be loosened. Unnecessary tension is applied to the needle thread, which tends to cause thread breakage, and since the needle thread is pulled out from the thread tension device at this time, the needle thread becomes loose. As a result, less looper thread is pulled out from the looper due to needle thread wadding, resulting in the formation of seams with poor texture.
上記のような問題を解消するには、針が三角形の中に降
下するまでの間は糸操り量を多くして糸の弛みを吸収し
、三角形の中に降下したのちには糸弛みを行うようにす
ればよいが、従来のように糸繰りが針の上下動のみを利
用して行うものでは、このような制御を行うことができ
ない。To solve the above problem, increase the amount of thread manipulation to absorb the slack in the thread until the needle descends into the triangle, and then loosen the thread after descending into the triangle. However, if the thread retrieval is carried out using only the vertical movement of the needle as in the past, such control cannot be performed.
本発明は糸操りを補完する糸繰り用カムを別に設けて針
が三角形の中に降下するまでの間の針糸の弛みを吸収し
、針が三角形の中に降下したのちには糸弛めを行えるよ
うにしたものである。The present invention provides a separate thread reeling cam to supplement the thread handling, absorbs the slack in the needle thread until the needle descends into the triangle, and absorbs the slack in the thread after the needle descends into the triangle. It has been made possible to do so.
課題の解決手段
本発明の針糸繰り機構はしたがって針棒に取着される針
糸案内と、ミシンのアームに位置調整可能に取付けられ
る計糸道からなり、ミシン針と糸調子器との間に設置さ
れて安全縫いミシンの二重環縫い用針糸に作用する針糸
繰り機構において、一対の目孔を有し、上記針糸道と糸
調子器との間のミシンのアームに位置調節可能に取付け
られる糸案内と、上メスレバーに取付けられ、一対の目
孔間を上下に往復動する糸繰りカムを設け、この糸操り
カムは針がルーパ糸とルーパに掛けられた針糸ループで
形成される三角形の中に降下するまでの間の針糸に係合
して糸繰り作用を行い、針が三角形の中に降下したのち
針糸との保合を解除するような形状としたものである。The needle thread take-up mechanism of the present invention therefore consists of a needle thread guide attached to the needle bar and a gauge thread guide attached to the arm of the sewing machine so that its position can be adjusted, and between the sewing machine needle and the thread tension regulator. The needle thread retracting mechanism that is installed and acts on the double chainstitch needle thread of the safety stitch sewing machine has a pair of holes and is adjustable in position on the arm of the sewing machine between the needle thread path and the thread tension device. A thread guide is attached to the thread guide, and a thread winding cam is mounted on the upper knife lever and moves up and down between a pair of eye holes. The shape of the needle is such that it engages with the needle thread until it descends into the triangle to perform a thread reeling action, and releases its engagement with the needle thread after the needle descends into the triangle.
作用
針棒の上下運動に基く糸の繰出し量は第５図に示すよう
に、針糸道２８から針棒上死点における針糸案内の位１
１２９Ａまでの距離Ｈと同下死点における位置２９Ｃま
での距＃Ｌとの差Ｌ−Ｈとなり、針糸を走行させない状
態で、この繰出し量をミシンの回転角度に対応させると
、第６図の破線及び実線からなる正弦曲線で示すことが
できる。そして・この発明における糸繰りカムの作用を
上記繰出し量に付加すると、実線で示す通りとなり、針
が上死点ａから降下して三角形の中に入るｂまでの間、
糸繰りカムが針糸に係合して糸操り作用を行い、点線で
示す従来の針糸さばきによる糸繰り量よりも余計に糸を
繰込んで弛みを吸収し、糸調子器を通して針糸が引き出
されない程度の適度なテンションをかける。針が三角形
の中に降下した直後ｂ′、糸繰りカムが針糸との係合を
解除し、繰込んだ針糸を開放する。これにより針糸が急
激に弛められる。なお図示する例においては、針が下死
点Ｃに達して上昇し、上死点に達する途上ｄでも余計に
糸を繰込むようになっており、これによって縫い目形成
に特に悪影響を与えることはないが、カムの形状や駆動
方法の工夫により、繰込み量をより小さくまたはなくす
方が望ましい。As shown in FIG. 5, the amount of thread fed out based on the vertical movement of the working needle bar is from the needle thread path 28 to the needle thread guide position 1 at the top dead center of the needle bar.
The difference between the distance H to 129A and the distance #L to position 29C at the same bottom dead center is L-H, and when this feed amount is made to correspond to the rotation angle of the sewing machine without running the needle thread, the result is shown in Fig. 6. It can be shown by a sinusoidal curve consisting of a broken line and a solid line. And, when the action of the thread reeling cam in this invention is added to the above-mentioned reeling amount, it becomes as shown by the solid line.
The thread take-up cam engages the needle thread and performs a thread manipulating action, absorbing the slack by taking in more thread than the amount of thread taken by conventional needle thread handling, as shown by the dotted line, and the needle thread is pulled out through the thread tension device. Apply just the right amount of tension so that it doesn't flop. Immediately after the needle has descended into the triangle b', the thread take-up cam disengages the needle thread and releases the drawn-in needle thread. This causes the needle thread to loosen rapidly. In the illustrated example, the needle reaches the bottom dead center C and rises, and even on the way to the top dead center d, additional thread is fed in. This does not have a particularly bad effect on stitch formation. However, it is desirable to reduce or eliminate the amount of retraction by improving the shape of the cam and the driving method.
実施例
第３図は針糸繰り機構を備えた安全縫いミシンを側面か
ら見た図で、ミシン１１のアームｌｌａは密閉室として
構成され、アームｌｆａより下方に突出して上下動可能
に支持される針棒１２がアームＩｌａ内で図示しない針
棒機構と連結され、強制給油されながら主軸と連動して
上下動するようになっており、その下端には縁かシリ縫
い用の計１３と二重環縫い用の計１４とが取付けである
。そして図示しない縁かシリ縫い用のルーパと二重環縫
い用のルーパと協働して縁かゾり縫い目と二重環縫い目
とを形成するようになっている。Embodiment FIG. 3 is a side view of a safety stitch sewing machine equipped with a needle thread retrieval mechanism, in which the arm lla of the sewing machine 11 is configured as a sealed chamber, and the needle protrudes downward from the arm lfa and is supported so as to be movable up and down. The rod 12 is connected to a needle bar mechanism (not shown) within the arm Ila, and moves up and down in conjunction with the main shaft while being forcibly lubricated, and has a total of 13 and a double ring at its lower end for edge or hem stitching. A total of 14 pieces for sewing are attached. A hemline seam and a double chain seam are formed by cooperating with a looper for edge hem stitching and a looper for double chain stitching (not shown).
ミシン１１は通常のオーバーロックミシンと同様、緑か
シリ縫い目形成に先立って布縁を切り揃える切断装置を
有しており、この切断装置は布支持台１１ｂの下方に固
定される下ナイフと、揺動レバー１５に取着される上ナ
イフ１６とからなり、揺動レバー１５は密閉構造のヘッ
ドｌｌａから側方に突出する軸１７の軸端に取着され、
主軸に連動して上下に揺動する。The sewing machine 11, like a normal overlock sewing machine, has a cutting device that trims the edges of the fabric prior to forming the green seam, and this cutting device includes a lower knife fixed below the fabric support base 11b; It consists of an upper knife 16 attached to a swing lever 15, and the swing lever 15 is attached to the shaft end of a shaft 17 that protrudes laterally from the head lla having a closed structure.
It swings up and down in conjunction with the main shaft.
針糸繰り機構は第１．２図に示されるように・糸調子器
１９とミシン針１３．１４との間に設置され、縁か一′
り縫い用の針糸２工に作用するものと、二重環縫い用の
針糸２２に作用するものとがあり、前者のものは一対の
目孔２３を備えた上側の糸案内２４及びヘッドＩｌａに
取着の針糸道２５を有し、また後者のものは、同じく一
対の口孔２６を備えた下側の糸案内２７、ヘッドｌｌｂ
に位置調整可能に取着される針糸道２８及び針棒下端の
針株に取着の針糸案内２９を有しており、更に揺動レバ
ー１５の中間部に取着されて糸案内２４と糸案内２７の
各目孔間を上下に往復動し、縁かシリ縫い用の針糸２１
に作用するカム部３１と二重環縫い用の針糸２２に作用
するカム部３２とを備えた糸繰りカム３３を有している
。As shown in Fig. 1.2, the needle thread take-up mechanism is installed between the thread tension device 19 and the sewing machine needle 13.
There are two types: one that acts on the needle thread 22 for double chain stitching and one that acts on the needle thread 22 for double chain stitching.The former has an upper thread guide 24 with a pair of holes 23 and a head The latter has a needle thread path 25 attached to Ila, and the latter has a lower thread guide 27, also provided with a pair of openings 26, head Ilb.
The needle thread guide 29 is attached to the needle stock at the lower end of the needle bar, and the needle thread guide 29 is attached to the intermediate portion of the swing lever 15. The needle thread 21 for edge stitching moves up and down between each hole in the thread guide 27.
It has a thread reeling cam 33 that includes a cam part 31 that acts on the needle thread 22 for double chainstitching and a cam part 32 that acts on the needle thread 22 for double chainstitching.
第４図は糸繰りカム３３の揺動中における針糸の相対位
置を第５図と対応させてそれぞれａ、ｂ、Ｃで示したも
ので、糸繰りカム３３のカム部３２は、計１４が上死点
にあき３点で目礼間の針糸２２に係合し、糸繰りカム３
３の下方への回動に伴って該針糸を下方に屈折させ、糸
２２の繰込みを行う一方、針１４が三角形の中に降下し
た直後（第４図のｂ点は針が三角形の中に降下する直前
を示す）、糸２２との保合を解除するように形成されて
いる。In FIG. 4, the relative positions of the needle threads during the swinging of the thread take-up cam 33 are shown as a, b, and C, respectively, in correspondence with FIG. It engages the needle thread 22 between the threads at three points at the dead center, and the thread reeling cam 3
As the needle 14 rotates downward, the needle thread is bent downward and the thread 22 is retracted. (shown just before descending into the interior), it is formed so as to release the attachment to the thread 22.
この実施例では、特に糸繰りカム３３の形状が本出願人
が先に実願昭６３−４５２１１号で示したカムとくらべ
、点すおいて大きく辰曲し、計１４が前記三角形の中に
降下した後、針下死点Ｃに至るまで急激に針糸を弛める
ことができるようにしている。In this embodiment, in particular, the shape of the thread reeling cam 33 is greatly bent at the point compared to the cam previously shown by the present applicant in Utility Application No. 63-45211, and a total of 14 thread reeling cams descend into the triangle. After that, the needle thread can be suddenly loosened until it reaches the needle bottom dead center C.
長孔３５を通してヘッドＩｌａに止めネジ３６により止
着される針糸道２８は長孔３５の範囲内で上下位置が謂
整できるようになっており、その位置調整によってカム
３３の作用に影響を与えることなく糸繰出し量の調整を
行うことができる。The needle thread path 28, which is fixed to the head Ila through the elongated hole 35 by a set screw 36, can be vertically adjusted within the range of the elongated hole 35, and the action of the cam 33 is influenced by adjusting the position. It is possible to adjust the yarn payout amount without giving any amount.
発明の効果
本発明の針糸繰り機構は以上のように、針が上死点から
降下してルーパ糸とルーパに捕捉された針糸ループで形
成される三角形の中に入るまでの間、糸繰りカムが二重
環縫い用の針糸に係合して糸繰り作用を行い、従来の針
糸さばきによる糸繰り量よりも余計に糸を繰込み、糸調
子器を通して針が引出されない程度の適度なテンシロン
をかける一方、針が三角形の中に降下した直後、糸繰り
カムが針糸との保合を解除し、繰込んだ針糸を開放する
ようにしたもので、運針が細かく、また薄生地のような
場合でも早抜けが起きることがなく空環もよくできる。Effects of the Invention As described above, the needle thread retrieval mechanism of the present invention uses the thread retrieval cam until the needle descends from the top dead center and enters the triangle formed by the looper thread and the needle thread loop captured by the looper. engages with the needle thread for double chainstitch and performs a thread retracting action, retracting more thread than the amount of thread retracted by conventional needle thread handling, and creating an appropriate tensile strength that prevents the needle from being pulled out through the thread tension device. Immediately after the needle descends into the triangle, the thread take-up cam releases its hold on the needle thread and releases the needle thread. Even in cases where there is no premature exit, empty rings are also possible.
しかも針降下中の針糸締りが良好となるので針糸テンシ
ョンを弱くすることができ、その結果、針糸を弛めても
ルーパ糸量がほとんど変化せず、パッカリングの少ない
縫い目を得ることができる。Moreover, since the needle thread tightens better during the needle descent, the needle thread tension can be weakened, and as a result, even when the needle thread is loosened, the amount of looper thread hardly changes, and stitches with less puckering can be obtained. I can do it.
第１図は糸繰り機構を備えた安全縫いミシンの要部正面
図、第２図は同機構の要部拡大側面図、第３図は安全縫
いミシンの側面図、第４図は糸繰りカムの要部拡大図、
第５図は針棒の上下運動における針糸道と針糸案内との
距離の説明図、第６図は糸繰り量とミシンの回転角度の
関係を示すグラフである。Fig. 1 is a front view of the main parts of a safety stitch sewing machine equipped with a thread reeling mechanism, Fig. 2 is an enlarged side view of the main parts of the same mechanism, Fig. 3 is a side view of the safety stitch sewing machine, and Fig. 4 is a main part of the thread reeling cam. Enlarged view of section,
FIG. 5 is an explanatory diagram of the distance between the needle thread path and the needle thread guide during the vertical movement of the needle bar, and FIG. 6 is a graph showing the relationship between the thread take-up amount and the rotation angle of the sewing machine.
Claims (1)
整可能に取付けられる針糸道からなり、ミシン針と糸調
子器との間に設置されて安全縫いミシンの二重環縫い用
針糸に作用する針糸繰り機構において、一対の目孔を有
し、上記針糸道と糸調子器との間のミシンのアームに位
置調節可能に取付けられる糸案内と、上メスレバーに取
付けられ、前記一対の目孔間を上下に往復動する糸繰り
カムを設け、この糸繰りカムは針がルーパ糸とルーパに
掛けられた針糸ループで形成される三角形の中に降下す
るまでの間の針糸に係合して糸繰り作用を行い、針が三
角形の中に降下したのち針糸との係合を解除するような
形状にされる安全縫いミシンの針糸繰り機構It consists of a needle thread guide attached to the needle bar and a needle thread guide attached to the arm of the sewing machine so that its position can be adjusted.It is installed between the sewing machine needle and the thread tension regulator for double chain stitching on safety stitch sewing machines. A needle thread reeling mechanism that acts on needle thread includes a thread guide having a pair of holes and mounted on the arm of the sewing machine between the needle thread path and the thread tension device so as to be adjustable in position, and a thread guide mounted on the upper knife lever, A thread take-up cam that reciprocates up and down between the pair of eye holes is provided, and this thread take-up cam collects the needle thread until the needle descends into the triangle formed by the looper thread and the needle thread loop hung on the looper. A needle thread retrieval mechanism of a safety stitch sewing machine that is shaped so that the needle engages with the needle to perform a retrieval action, and disengages the needle thread after the needle descends into a triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1098291A JPH0693949B2 (en) | 1989-04-17 | 1989-04-17 | Needle thread take-up mechanism of safety stitch machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1098291A JPH0693949B2 (en) | 1989-04-17 | 1989-04-17 | Needle thread take-up mechanism of safety stitch machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02274284A true JPH02274284A (en) | 1990-11-08 |
| JPH0693949B2 JPH0693949B2 (en) | 1994-11-24 |
Family
ID=14215824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1098291A Expired - Lifetime JPH0693949B2 (en) | 1989-04-17 | 1989-04-17 | Needle thread take-up mechanism of safety stitch machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0693949B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0556080U (en) * | 1992-01-06 | 1993-07-27 | ジャガー株式会社 | Balance device in sewing machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5278553A (en) * | 1975-12-23 | 1977-07-01 | Tokyo Juki Industrial Co Ltd | Chain stitching mechanism for sewing machine |
| JPS596786U (en) * | 1982-07-05 | 1984-01-17 | 本多 敬介 | sonobuoy device |
| JPS60188581U (en) * | 1984-05-25 | 1985-12-13 | ペガサスミシン株式会社 | Sewing machine thread control device |
| JPS6213948U (en) * | 1985-07-09 | 1987-01-28 | ||
| JPS62139483U (en) * | 1986-02-28 | 1987-09-02 | ||
| JPH01153186U (en) * | 1988-04-01 | 1989-10-23 |
-
1989
- 1989-04-17 JP JP1098291A patent/JPH0693949B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5278553A (en) * | 1975-12-23 | 1977-07-01 | Tokyo Juki Industrial Co Ltd | Chain stitching mechanism for sewing machine |
| JPS596786U (en) * | 1982-07-05 | 1984-01-17 | 本多 敬介 | sonobuoy device |
| JPS60188581U (en) * | 1984-05-25 | 1985-12-13 | ペガサスミシン株式会社 | Sewing machine thread control device |
| JPS6213948U (en) * | 1985-07-09 | 1987-01-28 | ||
| JPS62139483U (en) * | 1986-02-28 | 1987-09-02 | ||
| JPH01153186U (en) * | 1988-04-01 | 1989-10-23 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0556080U (en) * | 1992-01-06 | 1993-07-27 | ジャガー株式会社 | Balance device in sewing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0693949B2 (en) | 1994-11-24 |
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