JPH04135594A - Thread passing controllable sewing machine - Google Patents
Thread passing controllable sewing machineInfo
- Publication number
- JPH04135594A JPH04135594A JP25822990A JP25822990A JPH04135594A JP H04135594 A JPH04135594 A JP H04135594A JP 25822990 A JP25822990 A JP 25822990A JP 25822990 A JP25822990 A JP 25822990A JP H04135594 A JPH04135594 A JP H04135594A
- Authority
- JP
- Japan
- Prior art keywords
- thread
- tension
- sewing
- sewing machine
- needle
- 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.)
- Pending
Links
- 238000009958 sewing Methods 0.000 title claims abstract description 71
- 230000033001 locomotion Effects 0.000 claims abstract description 8
- 238000013459 approach Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 description 23
- 230000001276 controlling effect Effects 0.000 description 13
- 230000006835 compression Effects 0.000 description 12
- 238000007906 compression Methods 0.000 description 12
- 239000004744 fabric Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 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〕
本発明は糸通過制御可能なミシンに関し、特に１対の糸
係合体による上糸拘束の解放タイミングを縫製する縫目
模様の種類に応じて変更するようにしたものに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sewing machine capable of controlling thread passage, and in particular, it is possible to control the release timing of upper thread restraint by a pair of thread engaging bodies depending on the type of stitch pattern to be sewn. Regarding what you decided to change.
従来、本願出願人は特開昭６３−１０５７９０号公報や
特開昭６３−２７００８９号公報などにおいて、糸駒か
ら天秤に至る上糸をミシン主軸の回転に調時して天秤の
最大糸取上位置の所定期間に解放する一方、その期間以
外の期間に拘束する機械式の糸通過制御装置を設け、布
送り動作に連動して次の縫目形成に必要な上糸を糸駒か
ら繰り出すようして、糸調子器の糸調子圧（上糸張力）
を殆ど調整することなく上糸の太さに応じた強さで上糸
を引き締めできる糸通過制御可能なミシンを提案した。Conventionally, in Japanese Patent Application Laid-Open No. 63-105790 and Japanese Patent Application Laid-Open No. 63-270089, the applicant of the present application timed the needle thread from the thread spool to the thread take-up to the rotation of the sewing machine main shaft to obtain the maximum thread take-up of the thread take-up. A mechanical thread passing control device is provided that releases the thread during a predetermined period of time, but restricts it during periods other than that period, so that the upper thread necessary for forming the next stitch is fed out from the thread spool in conjunction with the fabric feed operation. and adjust the thread tension pressure (needle thread tension) of the thread tension device.
We have proposed a sewing machine that can control thread passage, which can tighten the upper thread with a strength that corresponds to the thickness of the upper thread with little adjustment.
ところで、加工布に基本的な縫い目として直線縫いゃジ
グザグ縫いを施す場合に、これらの縫い目を夫々最適な
品質で縫製するためには、直線縫いゃジグザグ縫いに適
した縫製条件を夫々専用に設定するのが望ましい。By the way, when performing straight stitches and zigzag stitches as basic seams on processed fabric, in order to sew these seams with optimal quality, it is necessary to set sewing conditions suitable for straight stitches and zigzag stitches respectively. It is desirable to do so.
即ち、ジグザグ縫いにおいては、ジグザグ縫いの中央部
で加工布が膨らまないようにソフトな縫い目で縫製する
ために、糸調子器による上糸張力は弱い方が良（、しか
も天秤が最上位置に到達して上糸を十分に引き締めたと
きに上糸の拘束を解放するのが片締まり防止のために望
ましい。一方、直線縫いにおいては、上糸の締まり具合
を良くして上糸に張りを与えながら縫製するために、糸
調子器による上糸張力を強い目にし、しかも天秤が最上
位置に到達する以前つまり上糸の引き締めが完了する以
前のときに上糸の拘束を解放して下糸調子に補正するの
が望ましい。特に、ジグザグ纏いの縫い目や直線纏いの
縫い目の品質は天秤の位置つまり上糸の引き締め具合に
対する上糸の解放タイミングにより影響を受は易い。In other words, in zigzag stitching, in order to sew a soft seam so that the fabric does not swell in the center of the zigzag stitch, it is better to use a weak needle thread tension with the thread tensioner (and also when the needle thread take-up reaches the highest position). In order to prevent uneven tightening, it is desirable to release the upper thread restriction when the upper thread has been sufficiently tightened.On the other hand, in straight stitches, it is desirable to improve the tightness of the upper thread and give tension to the upper thread. In order to sew while sewing, the upper thread tension by the thread tension device is strong, and before the thread take-up lever reaches the highest position, that is, before the upper thread tension is completed, the upper thread tension is released and the lower thread tension is adjusted. In particular, the quality of zigzag stitches and straight stitches is easily affected by the position of the thread take-up, that is, the release timing of the needle thread relative to the tightness of the needle thread.
従って、従来の糸通過制御可能なミシンにおいては、ジ
グザグ縫いの縫い目や直線縫いの縫い目の品質が夫々高
品質となるように、上糸の解放タイミングを微調整する
ようにしている。Therefore, in a conventional sewing machine capable of controlling thread passage, the release timing of the upper thread is finely adjusted so that the quality of zigzag stitches and straight stitches are of high quality.
前述したように、従来の糸通過制御可能なミシンにおい
ては、ジグザグ縫いの縫い目や直線纏いの縫い目の品質
が夫々高品質となるように、上糸の解放タイミングを微
調整しなければならず、この調整作業に多大の労力や作
業時間が必要となるという問題がある。As mentioned above, in conventional sewing machines that can control thread passage, the release timing of the upper thread must be finely adjusted so that the quality of zigzag stitches and straight stitches are of high quality. There is a problem in that this adjustment work requires a great deal of effort and work time.
更に、上糸の解放タイミングが天秤の最上位置側に遅く
なるように調節されたときには、縫い目がソフトになっ
てジグザグ纏いの縫い目の品質は良くなるが、直線縫い
目の品質が低下すること、また逆に上糸の解放タイミン
グが天秤の最下位置側に速くなるように調節されたとき
には、縫い目に張りが生じて直線の縫い目の品質は良く
なるが、ジグザグ縫い目の品質が低下すること、などの
問題がある。Furthermore, when the release timing of the upper thread is adjusted to be delayed toward the top position of the thread take-up, the seams become softer and the quality of zigzag stitches improves, but the quality of straight stitches deteriorates. Conversely, when the release timing of the upper thread is adjusted to be faster toward the lowest position of the thread take-up, tension is created in the seam, and the quality of straight seams improves, but the quality of zigzag seams deteriorates, etc. There is a problem.
本発明の目的は、縫い目に張りや締りを与える縫い方と
縫い目をソフトに縫う縫い方とを選択された模様に応じ
て切換えて縫製できるようにした糸通過制御可能なミシ
ンを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine capable of controlling thread passage by switching between a sewing method that gives tension and tightness to seams and a sewing method that creates soft seams depending on a selected pattern. be.
第１請求項に係る糸通過制御可能なミシンは、糸供給源
から天秤を経て縫針の目孔に至る糸供給路のうち糸供給
源と天秤間の上糸を挟持拘束する接近位置と上糸を解放
する離隔位置とに亙って相対移動可能な１対の糸係合体
と、天秤が最大系取上位置又はその付近にある所定期間
に離隔位置となりまたそれ以外の期間に接近位置となる
ようにミシン主軸の回転に調時して両糸係合体の相対移
動を制御する糸通過制御手段とを有する糸通過制御可能
なミシンにおいて、糸通過制御手段により両糸係合体を
離隔位置に切換えるタイミングよりも所定位相角だけ速
いタイミングで両糸係合体を離隔位置に切換える解放タ
イミング切換え手段と、少なくとも直線模様を含む所定
の模様が選択されたときに外部からの指令に基いて、解
放タイミング切換え手段を駆動する駆動手段とを備えた
ものである。A sewing machine capable of controlling thread passage according to a first aspect of the invention provides an approach position for pinching and restraining an upper thread between a thread supply source and a thread take-up in a thread supply path extending from a thread supply source to an eye of a sewing needle via a thread take-up; A pair of thread engaging bodies that are movable relative to each other between a separated position and a separated position for releasing the thread, and the thread engaging body is placed in the separated position during a predetermined period when the take-up lever is at or near the maximum system pick-up position, and is in the approached position during other periods. In a sewing machine capable of controlling thread passage, which has a thread passage control means that controls the relative movement of both thread engagement bodies in synchronization with the rotation of the sewing machine main shaft, the thread passage control means switches both thread engagement bodies to a separated position. release timing switching means for switching both thread engaging bodies to a separated position at a timing faster than the timing by a predetermined phase angle; and release timing switching means based on an external command when a predetermined pattern including at least a linear pattern is selected. and a driving means for driving the means.
第２請求項に係る糸通過制御可能なミシンは、上記第１
請求項に係る糸通過制御可能なミシンにおいて、解放タ
イミング切換え手段に作動連結された張力付与手段であ
って、解放タイミング切換え手段が駆動されたとき、糸
供給源と天秤間の上糸に設定された張力を付与する張力
付与手段を備えたものである。A sewing machine capable of controlling thread passage according to a second aspect of the present invention is provided with a sewing machine capable of controlling thread passage.
In the sewing machine capable of controlling thread passage according to the present invention, the tension applying means is operatively connected to the release timing switching means, and when the release timing switching means is driven, tension is applied to the upper thread between the thread supply source and the thread take-up. It is equipped with tension applying means for applying a certain tension.
第１請求項に係る糸通過制御可能なミシンにおいては、
駆動手段が少なくとも直線模様を含む所定の模様が選択
されたときに外部からの指令に基いて、解放タイミング
切換え手段を駆動しないときには、１対の糸係合体は糸
通過制御手段によりミシン主軸の回転に調時して天秤の
最大系取上位置またはその付近に有る所定期間に離隔位
置となるように制御されるとともに、それ以外の期間に
接近位置となるように制御される。即ち、両糸係合体は
天秤が最上位置に到達して上糸が十分に引き締められた
ときに離隔位置に切換えられるので、ソフトな縫い目で
縫製することができる。In the sewing machine capable of controlling thread passage according to the first claim,
When the drive means does not drive the release timing switching means based on an external command when a predetermined pattern including at least a linear pattern is selected, the pair of thread engaging bodies control the rotation of the main shaft of the sewing machine by the thread passage control means. The balance is controlled to be in the remote position during a predetermined period at or near the maximum system pick-up position of the balance, and to be in the close position during other periods. That is, since both thread engaging bodies are switched to the separated position when the thread take-up reaches the uppermost position and the upper thread is sufficiently tightened, it is possible to sew a soft seam.
一方、駆動手段が所定の模様以外の模様が選択されたと
きに外部からの指令に基いて、解放タイミング切換え手
段を駆動したときには、解放タイミング切換え手段は、
糸通過制御手段により両糸係合体を離隔位置に切換える
タイミングよりも所定位相角だけ速いタイミングで両糸
係合体をＨ階位置に切換える。即ち、天秤が最上位置に
到達する以前であり上糸の引き締めが完了する以前に両
糸係合体が離隔位置に切換えられるので、下糸調子にな
って上糸と下糸との交絡点が下糸側に移動して、加工布
上の上糸はより直線的で外観上好ましい縫い目にするこ
とができる。On the other hand, when the drive means drives the release timing switching means based on an external command when a pattern other than the predetermined pattern is selected, the release timing switching means
The yarn passage control means switches both yarn engaging bodies to the H-level position at a timing earlier than the timing at which both yarn engaging bodies are switched to the separated position by a predetermined phase angle. That is, before the thread take-up reaches the highest position and before the tightening of the upper thread is completed, both thread engaging bodies are switched to the separated position, so that the lower thread tension is reached and the intertwining point of the upper thread and lower thread is lower. Moving to the thread side, the needle thread on the work fabric can be made into a straighter and visually pleasing seam.
第２請求項に係る糸通過制御可能なミシンにおいては、
前記第１請求項と同様に作用するが、解放タイミング切
換え手段に作動連結された張力付与手段は、解放タイミ
ング切換え手段が駆動されたとき、糸供給源と天秤間の
上糸に設定された張力を付与するので、下糸調子になっ
て加工布上の上糸はより直線的で外観上好ましい縫い目
になるとともに、更に締り具合を向上させた縫い目にす
ることができる。In the sewing machine capable of controlling thread passage according to the second claim,
The tension applying means operatively connected to the release timing switching means operates in the same manner as in the first claim, but when the release timing switching means is driven, the tension applying means applies the tension set to the upper thread between the thread supply source and the thread take-up. As a result, the tension of the lower thread is adjusted so that the upper thread on the workpiece cloth becomes a straighter seam that is more pleasing in appearance, and the seam can also be made with improved tightness.
（発明の効果〕
第１請求項に係る糸通過制御可能なミシンによれば、〔
作用〕の項で説明したように、解放タイミング切換え手
段と駆動手段とを設け、両糸係合体を離隔位置に切換え
るタイミングを選択された模様に応じて、天秤が最上位
置に到達したときと到達する以前とに切り換えるように
して選択された模様に遺した縫製条件を設定するので、
直線などの所定の模様を張りのある縫い目で縫製でき、
また所定の模様以外の模様、例えばジグザグ模様をソフ
トな縫い目で縫製することができるうえ、上糸の解放タ
イミングを調整する作業がラフになり、この調整作業を
大幅に簡略化することができる。(Effect of the invention) According to the sewing machine capable of controlling thread passage according to the first claim, [
As explained in the section ``Function'', a release timing switching means and a driving means are provided, and the timing for switching the two thread engaging bodies to the separated position is determined depending on the selected pattern, when the thread take-up reaches the uppermost position and when the thread take-up reaches the uppermost position. The sewing conditions for the selected pattern can be set by switching between the previous and previous settings.
You can sew predetermined patterns such as straight lines with tight seams,
In addition, it is possible to sew a pattern other than the predetermined pattern, such as a zigzag pattern, with soft stitches, and the work of adjusting the release timing of the upper thread becomes rough, and this adjustment work can be greatly simplified.
第２請求項に係る糸通過制御可能なミシンによれば、上
記第１請求項と同様の効果が得られる。According to the sewing machine capable of controlling thread passage according to the second aspect, the same effects as in the first aspect can be obtained.
更に、直線などの所定の模様を縫製するときには、上糸
に設定された張力を付与するので、上糸に張りを与えて
上糸をより直線的にすることができるうえ、締り具合を
向上させた縫い目で縫製することができる。Furthermore, when sewing a predetermined pattern such as a straight line, a set tension is applied to the upper thread, which not only applies tension to the upper thread to make it straighter, but also improves tightness. It can be sewn with different seams.
以下、本発明の実施例について図面に基いて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
本実施例は糸通過制御装置を備えたミシンに本発明を適
用した場合のものである。This embodiment is a case where the present invention is applied to a sewing machine equipped with a thread passage control device.
先ず、ミシンＭのアーム部１の頭部２に設けられた針棒
上下駆動機構と天秤上下駆動機構とについて、第１図に
基いて説明する。First, the needle bar vertical drive mechanism and the thread take-up vertical drive mechanism provided on the head 2 of the arm section 1 of the sewing machine M will be explained with reference to FIG.
頭部２には針棒４と押え棒１０とが夫々上下方向に配設
され、この針棒４の下端には縫針５が取付けられ、押え
棒１０の下端には押え足１１が着脱可能に取付けられて
いる。前記針棒４は針棒支持体７に上下動可能に装着さ
れ、針棒支持体７の上端部は機枠９にビン８を介して枢
着され、針棒４は針棒支持体７とともにビン８を中心と
して左右方向に揺動可能であり、また針棒４は針棒支持
体７に対して上下動可能になっている。尚、図示してい
ないが針棒４を揺動させる針棒揺動機構が設けられてい
る。A needle bar 4 and a presser bar 10 are arranged vertically in the head 2, a sewing needle 5 is attached to the lower end of the needle bar 4, and a presser foot 11 is removably attached to the lower end of the presser bar 10. installed. The needle bar 4 is attached to a needle bar support 7 so as to be movable up and down, the upper end of the needle bar support 7 is pivotally attached to the machine frame 9 via a pin 8, and the needle bar 4 and the needle bar support 7 are The needle bar 4 is movable in the left and right directions about the bin 8, and the needle bar 4 is movable up and down with respect to the needle bar support 7. Although not shown, a needle bar swinging mechanism for swinging the needle bar 4 is provided.
前記押え棒１０は図示外の機構により機枠９に装着され
、操作レバー２３の操作により上昇位置と下降位置とに
亙って位置切換えされ、下降位置のときには加工布を針
仮に押圧するようになっている。The presser bar 10 is attached to the machine frame 9 by a mechanism not shown, and is switched between a raised position and a lowered position by operating a control lever 23, and when in the lowered position, it temporarily presses the work cloth with a needle. It has become.
一方、機枠９に回転自在に支持されたミシン主軸（以下
、主軸という）１３の斜め上の後方で主軸１３と平行に
配設された天秤支え軸１４は機枠９に取付けられている
。この天秤支え軸１４に揺動レバー１５の基端部が回動
自在に連結され、この揺動レバー１５は基端部から主軸
１３の左端部に固着された天秤クランク１日の左端面側
に延び、天秤クランク１８のクランクビン１９は揺動レ
ハ−１５に形成された細長いカム孔１６を挿通して左方
へ延びてその左端部には連結板２０が固着されている。On the other hand, a thread take-up support shaft 14 is attached to the machine frame 9 and is disposed obliquely above and behind the sewing machine main shaft (hereinafter referred to as the main shaft) 13 which is rotatably supported by the machine frame 9 and parallel to the main shaft 13. The base end of a swing lever 15 is rotatably connected to this balance support shaft 14, and the swing lever 15 is moved from the base end to the left end surface of the balance crank fixed to the left end of the main shaft 13. The crank pin 19 of the balance crank 18 passes through an elongated cam hole 16 formed in the swing gear 15 and extends to the left, and a connecting plate 20 is fixed to the left end thereof.
更に、連結板２０には段付きボルト２１で針棒クランク
２２の上端部が回転自在に連結され、針棒クランク２２
の下端部が針棒４の中段部に連結されている。Further, the upper end of a needle bar crank 22 is rotatably connected to the connecting plate 20 with a stepped bolt 21.
The lower end portion of the needle bar 4 is connected to the middle portion of the needle bar 4.
揺動レバー１５の前部の上端部には、クランク状に上方
へ延びる天秤１７が一体的に形成され、この天秤１７の
上端部には糸保持部１７ａが形成されている。A lever 17 extending upward in a crank shape is integrally formed at the upper end of the front part of the swinging lever 15, and a thread holding portion 17a is formed at the upper end of the lever 17.
前記揺動レバー１５のカム孔１６は、クランクピン１９
の回転軌跡と同半径で且つ最上位置付近にあるクランク
ピン１９が約７４°回転するのを許す円弧孔１６ａとそ
の円弧孔１６ａの両端部から真っ直ぐに延びる短い直孔
１６ｂとから構成されている。The cam hole 16 of the swing lever 15 is connected to the crank pin 19.
It is composed of an arcuate hole 16a that allows the crank pin 19 located near the top position to rotate approximately 74 degrees with the same radius as the rotation locus of and short straight holes 16b that extend straight from both ends of the arcuate hole 16a. .
従って、主軸１３の回転により天秤クランク１８とクラ
ンクピン１９とが主軸１３回りに回転すると、揺動レバ
ー１５は天秤支え軸１４を揺動中心として上下に往復揺
動するとともに、天秤１７の最上位置が所定期間に亙っ
て保持されるので、主軸１３の回転位相角をパラメータ
とする天秤１７の運動曲線ＭＡは第７図に示すようにな
る。Therefore, when the balance crank 18 and the crank pin 19 rotate around the main shaft 13 due to the rotation of the main shaft 13, the swing lever 15 reciprocates up and down about the balance support shaft 14, and the lever 15 moves back and forth to the uppermost position of the balance 17. is held for a predetermined period of time, the movement curve MA of the balance 17 with the rotational phase angle of the main shaft 13 as a parameter becomes as shown in FIG.
このとき、針棒４は第７図に針棒運動曲線ＭＢで示すよ
うに、主軸１３の回転に同期して針棒クランク２２とク
ランクピン１９とを介して上下に往復運動する。尚、第
７図における位相角は針棒４の最上位置をＯｏとしたも
のである。At this time, the needle bar 4 reciprocates up and down via the needle bar crank 22 and crank pin 19 in synchronization with the rotation of the main shaft 13, as shown by the needle bar movement curve MB in FIG. Incidentally, the phase angle in FIG. 7 is such that the uppermost position of the needle bar 4 is Oo.
次に、糸駒から天秤１７に至る上糸Ｎｓに張力を付与す
る糸調子器５１について、第１図〜第４図に基いて説明
する。尚、この糸調子器５１は通常のものと同様の構成
なので簡単に説明する。Next, the thread tension device 51 that applies tension to the upper thread Ns from the thread spool to the thread take-up lever 17 will be explained based on FIGS. 1 to 4. Note that this thread tension device 51 has the same structure as a normal one, so a brief explanation will be provided.
前記天秤１７の直く右側で且つ針棒クランク２２の直ぐ
左側には機枠９の一部である糸道体６３が上下方向に配
設され、この糸道体６３の上端部分の後端部には糸調子
器５１の調節ダイヤル５２を支持する支持部材６４が一
体に形成されている。Immediately to the right of the thread take-up 17 and immediately to the left of the needle bar crank 22, a thread guide body 63, which is a part of the machine frame 9, is disposed in the vertical direction, and the rear end of the upper end portion of the thread guide body 63 is disposed in the vertical direction. A support member 64 that supports the adjustment dial 52 of the thread tension device 51 is integrally formed in the thread tension device 51 .
糸道体６３の上端近傍部には左右方向向きに配設された
支軸５３の左端部が固着され、この支軸５３には左側か
ら１対の糸調子皿５４・５５、バネ受は具５６、圧縮バ
ネ５７、筒状のハネ受は具５８が順次外嵌されており、
ハネ受は具５８の外周に形成された甥子にはハネ受は具
５８と一体的に左右方向へ移動して圧縮バネ５７のバネ
力を変更する作動部材５９が螺合されている。更に、支
持部材６４に段付きビス６０で調節ダイヤル５２が回転
可能に取付けられ、この調節ダイヤル５２の中心部で前
方突出状に形成された偏心カム６１が作動部材５９の右
端面に当接している。The left end of a support shaft 53, which is disposed in the left-right direction, is fixed to the vicinity of the upper end of the thread guide body 63, and a pair of thread tension discs 54 and 55 and a spring receiver are attached to this support shaft 53 from the left side. 56, a compression spring 57, and a cylindrical spring receiver with fittings 58 fitted in order,
An operating member 59 is screwed into the spring receiver formed on the outer periphery of the tool 58, and the operating member 59 moves in the left-right direction integrally with the tool 58 to change the spring force of the compression spring 57. Further, an adjustment dial 52 is rotatably attached to the support member 64 with a stepped screw 60, and an eccentric cam 61 formed in a forward protruding shape at the center of the adjustment dial 52 comes into contact with the right end surface of the operating member 59. There is.
従って、調節ダイヤル５２を第２図にて時計方向へ回転
操作することにより、偏心カム６１による作動部材５９
の左方への移動で圧縮バネ５７のバネ力が大きくなり、
１対の糸調子皿５４・５５間の上糸Ｎｓに大きな張力が
作用し、また調節ダイヤル５２を第２図にて反時計方向
へ回転操作することにより、作動部材５９の右方への移
動で圧縮ハネ５７のバネ力が小さくなり、１対の糸調子
皿５４・５５間の上糸Ｎｓに小さな張力が作用する。尚
、この糸調子器５１による上糸Ｎｓに付与する張力は、
後述する糸通過制御機構を設けているので、上糸Ｎｓの
拘束が解放されたときに上糸Ｎｓに弱い張力を付与する
だけでよく、圧縮バネ５７のハネ力は小さく設定されて
いる。Therefore, by rotating the adjustment dial 52 clockwise in FIG.
By moving to the left, the spring force of the compression spring 57 increases,
A large tension is applied to the upper thread Ns between the pair of thread tension discs 54 and 55, and by rotating the adjustment dial 52 counterclockwise in FIG. 2, the actuating member 59 is moved to the right. The spring force of the compression spring 57 is reduced, and a small tension is applied to the upper thread Ns between the pair of thread tension discs 54 and 55. Note that the tension applied to the upper thread Ns by this thread tension device 51 is as follows:
Since a thread passage control mechanism, which will be described later, is provided, it is only necessary to apply a weak tension to the upper thread Ns when the upper thread Ns is released from restraint, and the spring force of the compression spring 57 is set to be small.
更に、第３図に示すように前記糸調子皿５５とバネ受は
具５６との間には、糸調子皿５５を傾動させて上糸Ｎｓ
に張力を作用させないようにするための平面視略クラン
ク状の張力解放レバー６２の作動部６２ａが設けられる
とともに、張力解放レバー６２の屈曲部６２ｂが糸調子
皿５５の後端部に右側から当接している。従って、張力
解放レバー６２の駆動部６２ｃを実線で示す不作動位置
から２点鎖線で示す作動位置へ回動させることにより、
テコの原理により作動部６２ａで圧縮バネ５７のバネ力
を除去するように作用するとともに、屈曲部６２ｂによ
り糸調子皿５５はその後端部を支点としてその前端側か
糸調子皿５４より離間するようになっている。Further, as shown in FIG. 3, between the thread tension plate 55 and the spring receiver 56, the upper thread Ns is
An actuating portion 62a of the tension release lever 62, which is substantially crank-shaped in plan view, is provided to prevent tension from being applied to the tension release lever 62, and a bent portion 62b of the tension release lever 62 comes into contact with the rear end of the thread tension plate 55 from the right side. are in contact with each other. Therefore, by rotating the drive portion 62c of the tension release lever 62 from the inoperative position shown by the solid line to the operating position shown by the two-dot chain line,
Based on the lever principle, the operating portion 62a acts to remove the spring force of the compression spring 57, and the bent portion 62b causes the thread tension disc 55 to move away from the front end side of the thread tension disc 54 with its rear end as a fulcrum. It has become.
次に、操作レバー２３を操作して押え棒１０を上昇位置
に移動させたとき、糸調子器５１により上糸Ｎｓに付与
される張力を解放する糸緩め機構１１０について、第１
図〜第４図に基いて説明する。Next, regarding the thread loosening mechanism 110 that releases the tension applied to the needle thread Ns by the thread tension device 51 when the operating lever 23 is operated to move the presser bar 10 to the raised position, the first
This will be explained based on FIGS.
前記操作レバー２３は、頭部２の機枠９に固着した枢支
ビン１１１に回動可能に枢支され、第２図に実線で示す
下降回動位置とこの位置から反時計方向に約９０’回動
させた２点鎖線で示す上昇回動位置とに亙って切換え可
能である。この枢支ビン１１１には操作レバー２３と一
体化された操作カム１１２が取付けられ、この操作カム
１１２の外周部の一部に作動カム部１１２ａが形成され
ている。一方、この操作レバー２３の位置から上方へ延
びる糸緩めリンク１１３が配設され、この糸緩めリンク
１１３はその略中段の位置でビン１１４で機枠９に回動
自在に枢支され、一端が機枠９に取付けられた引っ張り
バネ１１５でビン１１４を中心として第２図にて常に時
計回転方向に弾性付勢され、その下端部は作動カム１１
２に常に右方から押圧している。更に、糸緩めリンク１
１３の上端部分はクランク状に屈曲され、その上端部に
切欠部１１３ａが形成され、この切欠部１１３ａに前記
張力解放レバー６２の駆動部６２ｃの後端部が係合して
いる。従って、操作レバー２３が下降回動位置のときに
は糸緩めリンク１１３は実線で示す張力付与位置に位置
しているが、操作レバー２３を上昇回動位置に切換えた
ときには、作動カム１１２の作動カム部１１２ａにより
糸緩めリンク１１３の下端部が右方へ移動して糸緩めリ
ンク１１３は２点鎖線で示す糸緩め位置に回動する。そ
の結果、切欠部１１３ａに係合している駆動部６２ｃが
作動位置へ移動させるので、前述したように屈曲部６２
ｂにより糸調子皿５５はその後端部を支点としてその前
端側か糸調子皿５４より離間し、上糸Ｎｓの張力が解放
される。The operating lever 23 is rotatably supported by a pivot pin 111 fixed to the machine frame 9 of the head 2, and is rotated approximately 90 degrees counterclockwise from this position to a downward rotational position shown by a solid line in FIG. It is possible to switch between the raised rotational position shown by the rotated two-dot chain line. An operating cam 112 integrated with the operating lever 23 is attached to the pivot pin 111, and an operating cam portion 112a is formed in a part of the outer circumference of the operating cam 112. On the other hand, a thread loosening link 113 is provided that extends upward from the position of the operating lever 23, and this thread loosening link 113 is rotatably supported on the machine frame 9 by a bin 114 at a substantially middle position, and one end is A tension spring 115 attached to the machine frame 9 always elastically biases the bin 114 in the clockwise rotation direction as shown in FIG.
2. Always press from the right side. Furthermore, thread loosening link 1
The upper end portion of the tension release lever 62 is bent into a crank shape, and a notch 113a is formed at the upper end, and the rear end of the driving portion 62c of the tension release lever 62 is engaged with the notch 113a. Therefore, when the operating lever 23 is in the downward rotating position, the thread loosening link 113 is located in the tension applying position shown by the solid line, but when the operating lever 23 is switched to the upward rotating position, the operating cam portion of the operating cam 112 112a moves the lower end of the thread loosening link 113 to the right, and the thread loosening link 113 rotates to the thread loosening position shown by the two-dot chain line. As a result, the drive portion 62c engaged with the cutout portion 113a moves to the operating position, so that the bending portion 62c is moved as described above.
By b, the front end of the thread tension disc 55 moves away from the thread tension disc 54 with its rear end as a fulcrum, and the tension on the upper thread Ns is released.
次に、糸通過制御機構について第１図〜第５図に暴いて
説明する。Next, the thread passage control mechanism will be explained with reference to FIGS. 1 to 5.
糸駒（図示路）から天秤１７の糸保持部１７ａを経て縫
針５の目孔６に至る上糸供給路のうち、糸駒から糸保持
部１７ａに至る上糸Ｎｓを主軸１３に調時して拘束した
り解放したりできるように、糸道規制板（糸係合体）７
０と可動輪（糸係合体）７１及びこれらの接近・離隔を
制御する糸通過制御装置７２が次のように設けられてい
る。Of the needle thread supply path from the thread spool (path shown) to the thread holding portion 17a of the thread take-up lever 17 to the eye hole 6 of the sewing needle 5, the needle thread Ns from the thread spool to the thread holding portion 17a is timed to the main shaft 13. Thread path regulating plate (thread engagement body) 7
0, a movable ring (thread engagement body) 71, and a thread passage control device 72 that controls the approach and separation of these wheels are provided as follows.
前記糸道体６３の下端近傍部には、その左側面に糸道規
制板７０が固着されるとともに、左右方向に延びる枢支
ビン７３がその右端部で固着されている。この枢支ビン
７３には正面視略コ字状の第１可動部材７４が回動自在
に枢支され、更に第１可動部材７４の内側には正面視略
コ字状の第２可動部材７５が枢支ビン７３に回動自在に
枢支されている。この第１可動部材７４の右側壁７４ｂ
には、糸道規制板７０の規制部７０ａに下方より当接す
る可動輪７１が回転自在に枢着されている。Near the lower end of the thread guide body 63, a thread guide regulating plate 70 is fixed to its left side, and a pivot pin 73 extending in the left-right direction is fixed to its right end. A first movable member 74 having a substantially U-shape when viewed from the front is rotatably supported on the pivot pin 73, and a second movable member 75 having a substantially U-shape when viewed from the front is located inside the first movable member 74. is rotatably supported by a pivot pin 73. Right side wall 74b of this first movable member 74
A movable ring 71 that abuts the regulating portion 70a of the yarn path regulating plate 70 from below is rotatably attached to the movable ring 71.
即ち、糸調子器５１を経て来た上糸Ｎｓを規制部７０ａ
と可動輪７１との間で挟持拘束し得るようになっている
。That is, the upper thread Ns that has passed through the thread tension device 51 is passed through the regulating section 70a.
It can be clamped and restrained between the and the movable ring 71.
前記枢支ビン７３には捻じりハネ７６が装着され、その
捻じりバネ７６の一端部が第１可動部材７４のバネ受は
部７４ａに係合され、他端部が第２可動部材７５のバネ
受は部７５ａに係合されている。従って、第４図におい
て第１可動部材７４は第２可動部材７５に対して反時計
方向に弾性付勢され且つ第２可動部材７５は第１可動部
材７４に対して時計方向に弾性付勢されている。更に、
第２可動部材７５の左側壁７５ｃと右側壁７５ｂとにビ
ン７７が挿通され、このビン７７の右端部には円筒状の
回転規制部材７８が固着され、右側壁７４ｂから突出し
た規制部７４ｄがこの回転規制部材７８に当接すること
により、第１可動部材７４と第２可動部材７５とは所定
の位置間係で弾性的に一体化されている。また、右側壁
７５ｂには後方で斜め上方に延びる駆動アーム７９が設
けられている。つまり、この駆動アーム７９が第４図に
２点鎖線で示すように時計方向に回動したときには、第
１可動部材７４と第２可動部材７５とが時計方向に回動
して上糸Ｎｓの拘束が解除され、また駆動アーム７９が
反時計方向に実線で示す位置まで回動したときには、第
１可動部材７４と第２可動部材７５とが反時計方向に回
動して上糸ＮＳが拘束される。A torsion spring 76 is attached to the pivot pin 73, one end of the torsion spring 76 is engaged with the spring receiver 74a of the first movable member 74, and the other end is engaged with the spring receiver 74a of the second movable member 75. The spring receiver is engaged with the portion 75a. Therefore, in FIG. 4, the first movable member 74 is elastically biased counterclockwise relative to the second movable member 75, and the second movable member 75 is elastically biased clockwise relative to the first movable member 74. ing. Furthermore,
A bottle 77 is inserted between the left side wall 75c and the right side wall 75b of the second movable member 75, and a cylindrical rotation regulating member 78 is fixed to the right end of the bottle 77, and a regulating portion 74d protrudes from the right side wall 74b. By coming into contact with this rotation regulating member 78, the first movable member 74 and the second movable member 75 are elastically integrated with each other in a predetermined positional relationship. Further, a drive arm 79 is provided on the right side wall 75b and extends diagonally upward at the rear. That is, when the drive arm 79 rotates clockwise as shown by the two-dot chain line in FIG. When the restraint is released and the drive arm 79 rotates counterclockwise to the position shown by the solid line, the first movable member 74 and the second movable member 75 rotate counterclockwise, and the upper thread NS is restrained. be done.
前記可動輪７１の周面には環状の■溝７１ａが形成され
、規制部７０ａは可動輪７１の上半部の■溝７１ａに上
方から係合するように側面視にて逆Ｕ字形に形成され、
この規制部７０ａは断面Ｕ形の突曲面状に形成されてい
る。従って、糸駒からの上糸Ｎｓは糸調子器５１を経て
規制部７０ａでＵ字状に屈曲して糸保持部１７ａを経由
して目孔６に延びているので、上糸Ｎｓは可動輪７１と
規制部７０ａとで確実に拘束される。An annular groove 71a is formed on the circumferential surface of the movable ring 71, and the regulating portion 70a is formed into an inverted U shape in side view so as to engage with the groove 71a in the upper half of the movable ring 71 from above. is,
This regulating portion 70a is formed into a convexly curved surface having a U-shaped cross section. Therefore, the upper thread Ns from the thread spool passes through the thread tension device 51, is bent into a U-shape at the regulating part 70a, and extends to the eye hole 6 via the thread holding part 17a, so that the upper thread Ns passes through the movable ring. 71 and the regulating portion 70a to ensure the restraint.
そして、主軸１３の回転に調時して上糸Ｎｓの拘束と解
放を所定のタイミングで実行させるために、主軸１３に
は回転カム８０が固着され、この回転カム８０には第４
図・第６図に示すように、可動輪７１を規制部７０ａか
ら離隔させるとともに接近させるために略楕円状のカム
溝の一部分である楕円溝８１と可動輪７１を規制部７０
ａに接近させた状態を保持するために円形のカム溝の一
部分である円満８２とを組み合わせたカム溝８３が形成
されている。但し、円満８２の略後半部分の溝幅が拡大
されるとともに、この拡大された溝幅は楕円溝８１の約
２／３に亙って所定の溝幅に徐々に狭くなっている。A rotating cam 80 is fixed to the main shaft 13 in order to synchronize the rotation of the main shaft 13 and restrain and release the upper thread Ns at a predetermined timing.
As shown in FIG. 6, an elliptical groove 81, which is a part of a substantially elliptical cam groove, and a movable ring 71 are connected to the regulating part 70a in order to separate the movable ring 71 from the regulating part 70a and bring it closer to each other.
A cam groove 83 is formed in combination with a circular cam groove 82, which is a part of a circular cam groove, in order to maintain the state close to a. However, while the groove width at approximately the rear half of the round groove 82 is expanded, this expanded groove width gradually narrows to a predetermined groove width over about two-thirds of the elliptical groove 81.
前記天秤支え軸１４の直ぐ上方にはこの回転カム８０に
対応する位置から糸道体６３に対応する位置に亙って揺
動リンク８４が左右方向向きに配設され、この揺動リン
ク８４はその右端部に固着された第１アーム８５とその
左端部に固着された第２アーム８７とに天秤支え軸１４
を押通させて天秤支え軸１４に回転可能に支持されてい
る。そして、第１アーム８５の先端の接触子８６がカム
溝８３に係合され、第２アーム８７の先端に固着したピ
ン８８は駆動アーム７９の上端に回動可能に連結されて
いる。尚、揺動リンク８４は第４図に示すように、一端
を機枠９に固着した引っ張りハネ８９により常に時計回
転方向に弾性付勢されており、接触子８６が常にカム溝
８３の内側壁に当接するようになっている。Immediately above the balance support shaft 14, a swing link 84 is disposed in the left-right direction from a position corresponding to the rotary cam 80 to a position corresponding to the thread guide body 63. The balance support shaft 14 is attached to a first arm 85 fixed to its right end and a second arm 87 fixed to its left end.
is pushed through and rotatably supported by the balance support shaft 14. A contact 86 at the tip of the first arm 85 is engaged with the cam groove 83, and a pin 88 fixed to the tip of the second arm 87 is rotatably connected to the upper end of the drive arm 79. As shown in FIG. 4, the swing link 84 is always elastically biased in the clockwise rotational direction by a tension spring 89 whose one end is fixed to the machine frame 9, so that the contact 86 is always pressed against the inner wall of the cam groove 83. It is designed to come into contact with.
以上の糸通過制御装置７２において、主軸１３の回転に
より回転カム８０が回転し、カム溝８３を介して第１ア
ーム８５が揺動し、揺動リンク８４を介して第２アーム
８７が揺動して駆動アーム７９が揺動する。その結果、
前述したように、揺動リンク８４が第４図にて反時計方
向に揺動したときには上糸Ｎｓの拘束状態が解放され、
揺動リンク８４が時計方向に揺動したときには上糸Ｎｓ
が挟持拘束される。このように、回転カム８ｏのカム溝
８３に応じて上糸Ｎｓを解放したり拘束するジグザグ縫
い時の可動輪７１の移動曲線ＭＣを第７図に示す。In the above yarn passage control device 72, the rotation of the main shaft 13 rotates the rotating cam 80, the first arm 85 swings via the cam groove 83, and the second arm 87 swings via the swing link 84. As a result, the drive arm 79 swings. the result,
As described above, when the swing link 84 swings counterclockwise in FIG. 4, the upper thread Ns is released from the restrained state.
When the swing link 84 swings clockwise, the upper thread Ns
is clamped and restrained. FIG. 7 shows a movement curve MC of the movable wheel 71 during zigzag sewing in which the needle thread Ns is released or restrained according to the cam groove 83 of the rotating cam 8o.
第７図から判るように、天秤１７が最上位置がら最上位
置まで上昇する上糸Ｎｓの引き締め時には、糸道規制板
７０と可動輪７１により上糸Ｎｓが拘束されているので
上糸Ｎｓの引き締めが確実に実行される。一方、位相角
が約２８°となって天秤１７が最上位置に到達して引き
締めが完了したときには、布送り動作と連動して上糸Ｎ
ｓを供給するため糸道規制板７０と可動輪７１による拘
束が解除され（以下、この解放タイミングをジグザグ縫
い時の解放タイミングＳｚという）、必要量の上糸Ｎｓ
が糸駒から天秤１７の方へ供給される。As can be seen from FIG. 7, when tightening the upper thread Ns when the thread take-up lever 17 rises from the uppermost position to the uppermost position, the upper thread Ns is restrained by the thread path regulating plate 70 and the movable ring 71, so that the upper thread Ns is tightened. is carried out reliably. On the other hand, when the phase angle reaches approximately 28° and the thread take-up 17 reaches the uppermost position and tightening is completed, the needle thread N is
In order to supply the needle thread Ns, the restriction by the thread path regulating plate 70 and the movable wheel 71 is released (hereinafter, this release timing is referred to as the release timing Sz during zigzag sewing), and the required amount of upper thread Ns is released.
is supplied from the thread spool to the thread take-up 17.
このとき、細い上糸Ｎｓの場合には点Ｆ１の時点で解放
されまた点ＣＩの時点で拘束されるのに対して、太い上
糸Ｎｓの場合には点Ｆ１よりもかなり遅い点Ｆ２の時点
で解放されまた点Ｃ１に近い点Ｃ２の時点で拘束される
。従って、上糸Ｎｓが解放されるときまでに細い上糸Ｎ
ｓではそれに適した弱い張力で上糸Ｎｓが引き締められ
、また太い上糸Ｎｓではそれに適した強い張力で上糸Ｎ
ｓが引き締められる。At this time, in the case of the thin needle thread Ns, it is released at the point F1 and is restrained at the point CI, whereas in the case of the thick needle thread Ns, the point F2 is much later than the point F1. It is released at point C1, and is restrained at point C2, which is close to point C1. Therefore, by the time the upper thread Ns is released, the fine upper thread N
s, the upper thread Ns is tightened with an appropriate weak tension, and with a thick upper thread Ns, the upper thread Ns is tightened with an appropriate strong tension.
s is tightened.
次に、直線縫い時に上糸Ｎｓを解放するタイミングをジ
グザグ縫い時の解放タイミングより速くする解放タイミ
ング切換え機構９２について、第１図〜第６図に基いて
説明する。Next, a release timing switching mechanism 92 that makes the timing for releasing the upper thread Ns during straight stitching faster than the release timing during zigzag stitching will be explained based on FIGS. 1 to 6.
前記主軸１３には回転カム８０の直（右側の位置に円形
の第１カム９３と第２カム９４とが近接して固着されて
いる。これらのカム９３・９４の半径は同一であるが、
第１カム９３の外周部の一部には約１６０°に亙って所
定の高さを有する作動カム部９３ａが形成されている。A circular first cam 93 and a second cam 94 are closely fixed to the main shaft 13 on the right side of the rotary cam 80.The radii of these cams 93 and 94 are the same,
An operating cam portion 93a having a predetermined height over approximately 160° is formed in a part of the outer peripheral portion of the first cam 93.
前記両カム９３・９４の上側の機枠９にはホルダ９５が
ビス止めされ、このホルダ９５の１対の枢支部９５ａに
は左右向きの作動ビン９６が摺動自在且つ回転可能に枢
支され、この作動ビン９６には両カム９３・９４の何れ
かに係合する側面視路く字状の係合リンク９７の基端部
が固着されている。この作動ビン９６には左側の枢支部
９５ａと係合リンク９７とに亙って圧縮ハネ９８が外装
されるとともに、保合リンク９７の後方に延びる従動ア
ーム９７ａとホルダ９５とに引っ張りハネ９９が張架さ
れており、係合リンク９７は第２図に示すように右側の
枢支部９５ａに当接するジグザグ縫い位置となるように
常に弾性付勢されるとともに、係合リンク９７の斜め前
方で下方に延びる係合アーム９７ｂの先端部が第２カム
９４に係合するように常に弾性付勢されている。尚、こ
のときの作動ビン９６の位置を基準位置という。A holder 95 is screwed to the machine frame 9 above both the cams 93 and 94, and a left and right operating bin 96 is slidably and rotatably supported on a pair of pivot parts 95a of the holder 95. A base end portion of an engagement link 97 which engages either of the cams 93 or 94 and has a dogleg shape in side view is fixed to the operating pin 96. A compression spring 98 is mounted on the operating bin 96 over the left pivot portion 95a and the engagement link 97, and a tension spring 99 is mounted on the driven arm 97a extending rearward of the retaining link 97 and the holder 95. As shown in FIG. 2, the engaging link 97 is always elastically biased so as to be in the zigzag stitching position where it abuts against the right pivot portion 95a, and also downwardly diagonally in front of the engaging link 97. The distal end of the engagement arm 97b extending to the second cam 94 is always elastically biased to engage with the second cam 94. Note that the position of the operating bin 96 at this time is referred to as a reference position.
一方、保合アーム９７ｂを左方へ移動して第１カム９３
に係合させるために、ホルダ９５には右方向向きに解放
タイミング切換え用アクチュエータ（厳密には電磁石）
１００が取付けられ、この電磁アクチュエータ１００の
直ぐ右側のホルダ９５にはビン１０１、が立設され、こ
のビン１０１には回動部材１０２が回動自在に枢支され
、更にこのビン１０１には圧縮ハネ９８のバネ力より弱
いバネ力を有するコイルバネ１０３が装着され、回動部
材１０２はその作動部１０２ａが作動ビン９６の右端面
に常に当接するように弾性付勢されている。また、回動
部材１０２には、１ｍアクチュエータ１００の励磁によ
り回動部材１０２が第３図に実線で示す復帰位置から２
点鎖線で示す回動位置に回動し得るように、電磁アクチ
ュエータ１００のプランジャーに吸着される吸着壁１０
２ｂが設けられている。尚、回動部材１０２が回動位置
に回動したときの作動ビン９６の位置を切換え位置とい
う。On the other hand, the locking arm 97b is moved to the left and the first cam 93
In order to engage the holder 95, a release timing switching actuator (strictly speaking, an electromagnet) is attached to the holder 95 in the right direction.
100 is attached to the holder 95 on the immediate right side of the electromagnetic actuator 100, a bin 101 is erected, a rotary member 102 is rotatably supported on the bin 101, and a compression member 102 is rotatably supported on the bin 101. A coil spring 103 having a spring force weaker than that of the spring 98 is attached, and the rotating member 102 is elastically biased so that its operating portion 102a always comes into contact with the right end surface of the operating bin 96. Further, the rotating member 102 is moved 2 degrees from the return position shown by the solid line in FIG.
The suction wall 10 is attracted to the plunger of the electromagnetic actuator 100 so that it can be rotated to the rotation position shown by the dotted chain line.
2b is provided. Note that the position of the operating bin 96 when the rotating member 102 is rotated to the rotating position is referred to as a switching position.
前記第１アーム８５の後端部には、第３図に示すように
第１アーム８５と従動アーム９７ａとの距離より幾分短
い長さを有するビン１０４が固着されている。しかも、
このビン１０４と従動アーム９７ａの下端とには第５図
に示すように僅かな隙間が設けられている。A bottle 104 is fixed to the rear end of the first arm 85, as shown in FIG. 3, and has a length somewhat shorter than the distance between the first arm 85 and the driven arm 97a. Moreover,
A slight gap is provided between the bottle 104 and the lower end of the driven arm 97a, as shown in FIG.
従って、電磁アクチュエータ１００が励磁されたときに
は、回動部材１０２が復帰位置から回動位置に回動する
ので作動部１０２ａの左方への移動により作動ビン９６
が基準位置から切換え位置へ移動して係合リンク９７が
第３図に実線で示すジグザグ縫い位置から左方の２点鎖
線で示す直線縫い位置に移動し、係合アーム９７ｂは第
２図に２点鎖線で示すように左方へ移動して第１カム９
３に保合する。更に、このとき、従動アーム９７ａはビ
ン１０４に係合し得る位置に移動しているので、主軸１
３が回転されると、保合アーム９７ｂは作動カム部９３
ａにより第５図に２点鎖線で示すように時計方向に揺動
し、従動アーム９７ａの時計方向への回動によりビン１
０４を介して揺動リンク８４が第４図にて反時計方向に
回動するので、第２アーム８７、駆動アーム７９、第１
可動部材７４及び第２可動部材７５を介して可動輪７１
が糸道規制板７０から離隔し、上糸Ｎｓの拘束が解除さ
れる。Therefore, when the electromagnetic actuator 100 is excited, the rotating member 102 rotates from the return position to the rotating position, and the actuating portion 102a moves to the left, causing the operating bin 96 to move.
moves from the reference position to the switching position, the engagement link 97 moves from the zigzag sewing position shown by the solid line in FIG. Move to the left as shown by the two-dot chain line and press the first cam 9.
It concurs with 3. Furthermore, at this time, the driven arm 97a has moved to a position where it can engage with the bottle 104, so the main shaft 1
3 is rotated, the retaining arm 97b engages the operating cam portion 93.
a, the bin 1 is swung clockwise as shown by the two-dot chain line in FIG.
04, the swing link 84 rotates counterclockwise in FIG.
Movable ring 71 via movable member 74 and second movable member 75
is separated from the thread path regulating plate 70, and the upper thread Ns is released from being restrained.
ここで、ジグザグ纏いのときつまり保合リンク９７が第
２カム９４に係合しているときに、回転カム８０のカム
溝８３により可動輪７１が糸道規制板７０より離間する
ジグザグ縫い時の糸解放タイミングＳｚより直線縫いの
ときつまり保合リンク９７が第１カム９３に係合して作
動カム部９３ａにより可動輪７１が糸道規制板７０より
離間する直線縫い時の糸解放タイミングＳｓが速くなる
ように、作動カム部９３ａの糸解放のためのカム形状は
、第６図に２点鎖線で示すカム溝８３の糸解放のための
カム形状と等価のカム形状８３Ａより速く半径拡大方向
へ膨らむように形成されている。Here, during zigzag sewing, when the retaining link 97 is engaged with the second cam 94, the movable ring 71 is separated from the thread path regulating plate 70 by the cam groove 83 of the rotating cam 80. The thread release timing Ss during straight stitching, in which the retaining link 97 engages with the first cam 93 and the movable ring 71 is separated from the thread path regulating plate 70 by the operating cam portion 93a, is from the thread release timing Sz. In order to increase the speed, the cam shape of the actuating cam portion 93a for thread release is faster than the cam shape 83A, which is equivalent to the cam shape for thread release of the cam groove 83 shown by the two-dot chain line in FIG. It is formed to bulge out.
但し、直線縫い時には、第１アーム８５の接触子８６は
カム溝８３による揺動タイミングより速く揺動するが、
接触子８６はカム溝８３の溝幅拡大部分に位置している
ので、揺動リンク８４は何ら回動規制を受けることがな
い。この直線縫い時の可動輪７１の移動曲線ＭＤを第７
図に示す。However, during straight sewing, the contact 86 of the first arm 85 swings faster than the swing timing of the cam groove 83;
Since the contactor 86 is located in the widened portion of the cam groove 83, the swing link 84 is not subject to any rotation restriction. The movement curve MD of the movable wheel 71 during this straight sewing is the seventh
As shown in the figure.
次に、直線纏いのときに、前記糸調子器５１による張力
に加えて所定の張力を上糸Ｎｓに追加付与する張力付与
機構１２０について、第１図〜第３図に基いて説明する
。Next, the tension applying mechanism 120 that additionally applies a predetermined tension to the needle thread Ns in addition to the tension applied by the thread tension device 51 during straight weaving will be described with reference to FIGS. 1 to 3.
前記作動ピン９６の左側で糸調子器５１の直く後ろ側の
機枠９には補助糸調子皿１２１が固着され、この補助糸
調子皿１２１に作動ピン９６と同径の支軸１２２の左端
部が固着され、この支軸１２２の右端部分は作動ピン９
６の左端部分に外嵌して固着された円筒部材１２３の内
部に左方から幾分挿入されており、この支軸１２２には
補助糸調子皿１２１に当接する補助糸調子皿１２４、圧
縮バネ１２５が夫々外装され、圧縮バネ１２５の左端部
は補助糸調子皿１２４に当接し、その右端部は円筒部材
１２３の左端面に当接している。ここで、この圧縮バネ
１２５のハネ力は小さく設定されておりて、作動ピン９
６が基準位置のときには上糸Ｎｓに張力が殆ど付与され
ないが、作動ピン９６が切換位置に移動したときには上
糸Ｎｓに数グラム／ ｃ４の弱い張力が付与される。更
に、前記張力解放レバー６２に一体形成された解除アー
ム１２６が補助糸調子皿１２４の下端部に延出されてお
り、操作レバー２３を上昇回動位置へ切換えて張力解放
レバー６２が作動位置へ回動したときには、この解除ア
ーム１２６で補助糸調子皿１２４の下端部が左方へ移動
されるので、テコの原理により補助糸調子皿１２４の上
端部が補助糸調子皿１２１から離間して上糸Ｎｓの張力
が解放される。An auxiliary thread tension disc 121 is fixed to the machine frame 9 immediately behind the thread tension device 51 on the left side of the operating pin 96, and the left end of a support shaft 122 having the same diameter as the operating pin 96 is attached to the auxiliary thread tension disc 121. The right end portion of this support shaft 122 is fixed to the operating pin 9.
It is inserted somewhat from the left into the interior of a cylindrical member 123 that is externally fitted and fixed to the left end portion of the thread tension disc 123, and this support shaft 122 has an auxiliary thread tension disc 124 that contacts the auxiliary thread tension disc 121, and a compression spring. The left end of the compression spring 125 is in contact with the auxiliary thread tension disk 124, and the right end thereof is in contact with the left end surface of the cylindrical member 123. Here, the spring force of this compression spring 125 is set small, and the operating pin 9
6 is in the reference position, almost no tension is applied to the upper thread Ns, but when the operating pin 96 moves to the switching position, a weak tension of several grams/c4 is applied to the upper thread Ns. Further, a release arm 126 integrally formed with the tension release lever 62 extends to the lower end of the auxiliary thread tension plate 124, and the tension release lever 62 is moved to the operating position by switching the operating lever 23 to the upward rotation position. When the release arm 126 rotates, the lower end of the auxiliary thread tension disc 124 is moved to the left, so that the upper end of the auxiliary thread tension disc 124 is separated from the auxiliary thread tension disc 121 due to the lever principle and raised. The tension in the thread Ns is released.
次に、ミシンＭの制御系は第８図のブロック図に示すよ
うに構成されている。Next, the control system of the sewing machine M is constructed as shown in the block diagram of FIG.
縫製運転の起動・停止を指示する起動・停止スイッチ１
３０、所望の縫製模様を選択するテンキーからなる模様
選択スイッチ１３１、主軸１３の回転位相角を針棒４の
最上位置を基準として所定微小位相角毎にパルス信号を
発生するタイミング信号発生器１３２は制御装置Ｃの入
出力インターフェイス１３６に接続されている。更に、
入出力インターフェイス１３６には、駆動回路１３４介
して主軸１３を駆動するミシンモータ１３３が、駆動回
路１３５を介して電磁アクチュエータ１００が夫々接続
されている。Start/stop switch 1 for instructing start/stop of sewing operation
30, a pattern selection switch 131 consisting of a numeric keypad for selecting a desired sewing pattern, and a timing signal generator 132 that generates a pulse signal at every predetermined minute phase angle of the rotational phase angle of the main shaft 13 with reference to the top position of the needle bar 4. It is connected to the input/output interface 136 of the control device C. Furthermore,
A sewing machine motor 133 that drives the main shaft 13 via a drive circuit 134 and an electromagnetic actuator 100 are connected to the input/output interface 136 via a drive circuit 135, respectively.
制御装置ＣはＣＰＵ１３８と、ＣＰＵ１３８にデータバ
スなどのバス１３７を介して接続された入出力インター
フェイス１３６、ＲＯＭ１３９及びＲＡＭ１４０とから
構成されており、ＲＯＭｌ３９のプログラムメモリには
、ミシンＭ全体を制御する制御プログラム、模様選択ス
イッチ１３１で直線纏いが選択されたときに電磁アクチ
ュエータ１００を駆動する制御プログラムなどが格納さ
れている。The control device C is composed of a CPU 138, an input/output interface 136 connected to the CPU 138 via a bus 137 such as a data bus, a ROM 139, and a RAM 140. The program memory of the ROM 139 contains control information for controlling the entire sewing machine M. Programs, a control program for driving the electromagnetic actuator 100 when a straight line pattern is selected with the pattern selection switch 131, and the like are stored.
以上のように構成されるミシンＭにおいて、模様選択ス
イッチの操作で直線模様以外のジグザグ模様を選択した
ときには、起動・停止スイッチ１１０からの起動信号に
よりミシンモータ１１５が駆動されて主軸１３が回転す
るが、ｔ４ｆｅｔアクチュエータ１００は駆動されない
ので、係合リンク９７は第２カム９４に保合したジグザ
グ縫い位置であり、天秤１７及び針棒４は第７図に示す
運動曲線により駆動されるのと同時に、天秤１７による
上糸Ｎｓの引き締めが完了する位相角約２８°のジグザ
グ縫い解放タイミングＳｚから回転カム８０により可動
輪７１が糸道規制板７０から離間され、位相角約１１３
°までに可動輪７１が糸道規制板７０に接近する。この
とき、上糸Ｎｓには糸調子器５１による弱い上糸張力だ
けが付与されている。In the sewing machine M configured as described above, when a zigzag pattern other than a straight pattern is selected by operating the pattern selection switch, the sewing machine motor 115 is driven by a start signal from the start/stop switch 110 and the main shaft 13 is rotated. However, since the t4fet actuator 100 is not driven, the engagement link 97 is in the zigzag sewing position held by the second cam 94, and the thread take-up lever 17 and needle bar 4 are driven according to the motion curve shown in FIG. From the zigzag stitch release timing Sz at a phase angle of approximately 28° when the needle thread Ns has been tightened by the thread take-up lever 17, the movable ring 71 is separated from the thread path regulating plate 70 by the rotary cam 80, and the phase angle is approximately 113°.
The movable wheel 71 approaches the yarn path regulating plate 70 by . At this time, only a weak needle thread tension is applied to the needle thread Ns by the thread tension device 51.
従って、ジグザグ縫い時には、上糸Ｎｓと下糸とのバラ
ンスの良いソフトな縫い目で縫製することができる。Therefore, during zigzag sewing, it is possible to sew with a soft seam with a good balance between the upper thread Ns and the lower thread.
ところで、直線模様を選択して起動・停止スイッチ１１
０を操作したときには、ミシンモータ１１５が駆動され
て主軸１３が回転されるとともに、タイミング信号発生
器１１４からのタイミング信号に基いて駆動直後で保合
アーム９７ｂが第１カム９３の作動カム部９３ａに係合
しない位相角約３００°のときに！磁アクチエエータ１
００が駆動される。従って、作動ピン９６の切換位置へ
の移動により張力付与機構１２０による弱い張力が上糸
Ｎｓに追加付与される一方、係合リンク９７は第１カム
９３に係合するので、天秤１７による上糸Ｎｓの引き締
めが完了する以前の位相角約１８°の直線縫い解放タイ
ミングＳｓから第１カム９３により可動輪７１が糸道規
制板７０から離間され、位相角駒１１３°までに可動輪
７１が糸道規制板７０に接近する。従って、直線縫い時
には、下糸調子に補正され、上糸の締まり具合を良くし
て上糸に張りを与えた縫い目で縫製することができる。By the way, select the linear pattern and press the start/stop switch 11.
0, the sewing machine motor 115 is driven to rotate the main shaft 13, and the locking arm 97b is moved to the operating cam portion 93a of the first cam 93 immediately after driving based on the timing signal from the timing signal generator 114. When the phase angle is about 300°, it does not engage! Magnetic actuator 1
00 is driven. Therefore, by moving the operating pin 96 to the switching position, a weak tension is additionally applied to the upper thread Ns by the tension applying mechanism 120, while the engagement link 97 engages with the first cam 93, so that the upper thread is The movable ring 71 is separated from the thread path regulating plate 70 by the first cam 93 from the straight stitch release timing Ss at a phase angle of about 18° before the tightening of Ns is completed, and the movable ring 71 moves away from the thread path regulating plate 70 by the phase angle piece 113°. Approach the road regulation board 70. Therefore, when sewing a straight line, the lower thread tension is corrected, the tightness of the upper thread is improved, and stitches can be sewn with tension applied to the upper thread.
以上説明したように、上糸を解放するタイミングをジグ
ザグ縫い時と直線縫い時とで切換えるようにしたので、
上糸を解放するタイミングの調整作業を大幅に簡略化す
ることができる。As explained above, the timing of releasing the upper thread can be changed between zigzag sewing and straight sewing, so
The work of adjusting the timing for releasing the upper thread can be greatly simplified.
更に、ジグザグ縫い時にはソフトな縫い目で縫製でき、
直線縫い時には上糸に張りを与えて上糸をより直線的に
縫えるうえ、締まり具合を向上させた縫い目で縫製でき
る。Furthermore, when sewing zigzags, you can sew with soft seams,
When sewing straight lines, tension is applied to the upper thread so that the upper thread can be sewn more straightly, and the stitches can be sewn with improved tightness.
尚、直線纏いを基本とするＵ三重縫い」などの模様を選
択したときに、電磁アクチュエータ１００を駆動するよ
うにしてもよい。Note that the electromagnetic actuator 100 may be driven when a pattern such as "U triple stitching based on straight weaving" is selected.
図面は本発明の実施例を示すもので、第１図はミシンの
アーム部と頭部に組み込まれた内部機構の要部斜視図、
第２図は前記内部機構の部分正面図、第３図は内部機構
の部分平面図、第４図は内部機構の左側面図、第５図は
内部機構の右側面図、第６図は第２図Ｖｌ−ＶＩ線断面
図、第７図ミシンの各機構の動作を示すタイムチャート
、第８図はミシンの制御系のブロック図である。
Ｍ・・ミシン、 １３・・ミシン主軸、 １７・・
天秤、 ７０・・糸道規制板、 ７１・・可動輪、 ７
２・・糸通過制御装置、 ７４・７５・・可動部材、
７９・・駆動アーム、 ８０・・回転カム、 ８３・
・カム溝、 ８４・・揺動リンク、 ８５・・第１
アーム、 ８７・・第２アーム、 ９２・・解放タ
イミング切換え機構、９３・・第１カム、 ９７・・係
合リンク、 １００・・を磁アクチュエータ、 １
０２・・回動部材、 １０４・・ピン、 １１５・
・ミシンモータ、 １２０・・張力付与機構、 １
２１・１２４・・補助糸調子皿、 １２５・・圧縮バネ
。
特許出願人 ブラザー工業株式会社
第４図
第５
図
第
図The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of the main parts of the internal mechanism incorporated in the arm and head of the sewing machine;
Fig. 2 is a partial front view of the internal mechanism, Fig. 3 is a partial plan view of the internal mechanism, Fig. 4 is a left side view of the internal mechanism, Fig. 5 is a right side view of the internal mechanism, and Fig. 6 is a partial plan view of the internal mechanism. FIG. 2 is a sectional view taken along line Vl-VI, FIG. 7 is a time chart showing the operation of each mechanism of the sewing machine, and FIG. 8 is a block diagram of the control system of the sewing machine. M... Sewing machine, 13... Sewing machine main shaft, 17...
Balance, 70... Thread path regulation plate, 71... Movable wheel, 7
2. Yarn passage control device, 74, 75. Movable member,
79... Drive arm, 80... Rotating cam, 83...
・Cam groove, 84... Swing link, 85... 1st
Arm, 87...Second arm, 92...Release timing switching mechanism, 93...First cam, 97...Engagement link, 100...Magnetic actuator, 1
02... Rotating member, 104... Pin, 115...
・Sewing machine motor, 120...Tension applying mechanism, 1
21, 124...Auxiliary thread tension disc, 125...Compression spring. Patent applicant: Brother Industries, Ltd. Figure 4 Figure 5 Figure 5
Claims (2)
路のうち糸供給源と天秤間の上糸を挟持拘束する接近位
置と上糸を解放する離隔位置とに亙って相対移動可能な
１対の糸係合体と、天秤が最大系取上位置又はその付近
にある所定期間に離隔位置となりまたそれ以外の期間に
接近位置となるようにミシン主軸の回転に調時して両糸
係合体の相対移動を制御する糸通過制御手段とを有する
糸通過制御可能なミシンにおいて、 糸通過制御手段により両糸係合体を離隔位置に切換える
タイミングよりも所定位相角だけ速いタイミングで両糸
係合体を離隔位置に切換える解放タイミング切換え手段
と、 少なくとも直線模様を含む所定の模様が選択されたとき
に外部からの指令に基いて、解放タイミング切換え手段
を駆動する駆動手段とを備えたことを特徴とする糸通過
制御可能なミシン。(1) In the thread supply path from the thread supply source to the eye of the sewing needle via the thread take-up, the distance between the approach position where the needle thread is clamped and restrained between the thread supply source and the thread take-up, and the separation position where the needle thread is released is relative. The sewing machine is timed with the rotation of the main shaft of the sewing machine so that a pair of movable thread engaging bodies and a thread take-up are in a separated position during a predetermined period when the thread take-up position is at or near the maximum system pick-up position, and are in a close position during other periods. In a sewing machine capable of controlling thread passage, which has thread passage control means that controls relative movement of both thread engaging bodies, the thread passing control means moves both thread engaging bodies at a timing earlier than a timing at which both thread engaging bodies are switched to a separated position by a predetermined phase angle. A release timing switching means for switching the thread engaging body to a separated position, and a driving means for driving the release timing switching means based on an external command when a predetermined pattern including at least a linear pattern is selected. A sewing machine with controllable thread passage.
張力付与手段であって、解放タイミング切換え手段が駆
動されたとき、糸供給源と天秤間の上糸に設定された張
力を付与する張力付与手段を備えたことを特徴とする第
１請求項に記載の糸通過制御可能なミシン。(2) Tension applying means operably connected to the release timing switching means, the tension applying means applying a set tension to the needle thread between the thread supply source and the thread take-up when the release timing switching means is driven. A sewing machine capable of controlling thread passage according to claim 1, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25822990A JPH04135594A (en) | 1990-09-26 | 1990-09-26 | Thread passing controllable sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25822990A JPH04135594A (en) | 1990-09-26 | 1990-09-26 | Thread passing controllable sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04135594A true JPH04135594A (en) | 1992-05-11 |
Family
ID=17317314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25822990A Pending JPH04135594A (en) | 1990-09-26 | 1990-09-26 | Thread passing controllable sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04135594A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006141869A (en) * | 2004-11-24 | 2006-06-08 | Brother Ind Ltd | Sewing machine |
| US7240628B2 (en) | 2004-03-15 | 2007-07-10 | Vsm Group Ab | Thread feed for a sewing machine |
-
1990
- 1990-09-26 JP JP25822990A patent/JPH04135594A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7240628B2 (en) | 2004-03-15 | 2007-07-10 | Vsm Group Ab | Thread feed for a sewing machine |
| JP2006141869A (en) * | 2004-11-24 | 2006-06-08 | Brother Ind Ltd | Sewing machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS625388A (en) | Constant dimension stitching apparatus in sewing machine | |
| JPH04135594A (en) | Thread passing controllable sewing machine | |
| US5806448A (en) | Overlock sewing machine | |
| JP2006102399A (en) | Sewing machine | |
| JPS62101285A (en) | Sewing machine | |
| JP2006230465A (en) | Buttonholing machine | |
| US4886004A (en) | Needle thread tension control including separate stopping and adjustable pre-tension devices | |
| JPH04135596A (en) | Thread passing controllable sewing machine | |
| JPH0613071B2 (en) | Sewing machine with thread passing control | |
| JP2767924B2 (en) | Thread trimming sewing machine | |
| JP2917477B2 (en) | Sewing machine with threading device | |
| JPH0510796Y2 (en) | ||
| JP2650272B2 (en) | Sewing machine with automatic thread tension control | |
| JPH05317556A (en) | Thread passing controllable sewing machine | |
| JP3671664B2 (en) | Needle thread tension adjusting device for cycle sewing machine | |
| JPH0424082A (en) | Thread tension guide of besting sewing machine | |
| JPH0790063B2 (en) | Sewing machine with thread passing control | |
| JPH01212591A (en) | Electronic control type zigzag sewing-machine | |
| JPS63296787A (en) | Balance apparatus of automatic stitch balancing and thread tension sewing machine | |
| JPS625394A (en) | Constant dimension stitching device in playback sewing machine | |
| JPS63283686A (en) | Automatic stitch balancing thread tension sewing machine | |
| JPS63272388A (en) | Automatic thread tension adjustable main sewing machine | |
| JPS63296786A (en) | Balance apparatus of automatic stitch balancing and thread tension sewing machine | |
| JPH04135595A (en) | Sewing machine provided with thread loosening mechanism | |
| JPS63105790A (en) | Yarn passage controllable sewing machine |