JPH0354599B2 - - Google Patents
Info
- Publication number
- JPH0354599B2 JPH0354599B2 JP4697988A JP4697988A JPH0354599B2 JP H0354599 B2 JPH0354599 B2 JP H0354599B2 JP 4697988 A JP4697988 A JP 4697988A JP 4697988 A JP4697988 A JP 4697988A JP H0354599 B2 JPH0354599 B2 JP H0354599B2
- Authority
- JP
- Japan
- Prior art keywords
- thread
- needle
- take
- cam
- sewing machine
- 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.)
- Expired
Links
- 238000009958 sewing Methods 0.000 claims description 22
- 239000004744 fabric Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Sewing Machines And Sewing (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ミシンの天秤機構に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a thread take-up mechanism for a sewing machine.
従来、オーバロツクミシン、あるいは環縫いミ
シン等のルーパーを備えたミシンの天秤機構１
は、第１図に示すように、針と連動して上下動す
る部材即ち、針棒だき２に固定された山型状のカ
ム状天秤であつた。
Conventionally, a balance mechanism 1 of a sewing machine equipped with a looper such as an overlock sewing machine or a chain stitch sewing machine
As shown in FIG. 1, this was a chevron-shaped cam-shaped balance fixed to a member that moves up and down in conjunction with the needle, that is, a needle bar holder 2.
この天秤１は、第２図に示すように針糸案内
３，３に掛出した針糸４に当接して天秤作用を奏
する。 As shown in FIG. 2, this thread take-up 1 comes into contact with the needle thread 4 hanging from the needle thread guides 3, 3, and exerts a thread take-up action.
しかしながら、このような山型状のカム状天秤
では、第３図に示すように天秤の往動時と復動時
の糸取り量が全く同一となつてしまう。
However, with such a chevron-shaped cam-like thread take-up, the amount of thread taken up when the thread take-up moves forward and when it moves back is exactly the same, as shown in FIG.
このため、例えば天秤往動時の主軸回転角が
30゜付近で糸取りを行う様に、天秤のカム型形状
を決定すると、天秤往動時の330゜付近でも糸取り
を行つてしまい、糸切れが生じたり、縫目不良が
生じてまうという問題点があつた。 For this reason, for example, the spindle rotation angle when the balance moves forward is
If the cam shape of the thread take-up is determined so that thread take-up occurs at around 30 degrees, thread take-up will occur even at around 330 degrees when the thread take-up moves forward, resulting in thread breakage and poor stitching. It was hot.
この発明は主軸に連動して単に往復動するだけ
の天秤において、天秤往復動時の針糸の糸取り量
を変化させることができるミシンの天秤機構を提
供するにある。 The object of the present invention is to provide a thread take-up mechanism for a sewing machine that is capable of changing the amount of needle thread taken up when the thread take-up moves back and forth in conjunction with a main shaft.
請求項１、請求項２に記載の発明は主軸に連動
して上下動する針棒あるいは上メスにカム状天秤
をもうけるとともに、カム状天秤に往動時に針糸
と掛合しこれを引き上げ、復動時には針糸を円滑
にカム状天秤の縁部に案内する凹部を形成した構
成とするものである。
The invention described in claims 1 and 2 is provided with a cam-like take-up on the needle bar or upper knife that moves up and down in conjunction with the main shaft, and the cam-like take-up engages the needle thread during forward movement to pull it up and return. The needle thread is configured to have a concave portion that smoothly guides the needle thread to the edge of the cam-like thread take-up during movement.
さらに請求項３に記載の発明はカム状天秤の針
糸との掛合を解除し確実に縁部に案内する案内部
材を設けた構成としたものである。 Furthermore, the invention as set forth in claim 3 has a configuration in which a guide member is provided to release the engagement of the cam-like thread take-up with the needle thread and reliably guide it to the edge.
この発明のミシンの天秤機構にあつては、天秤
の往動時には凹部の掛合面部が針糸と掛合してこ
れを引き上げ糸取り量を増大し、針糸の天秤の往
動に従つて掛合面部をのり越え、縁部に案内され
て天秤が復動状態に至つた時には針糸は凹部の案
内面部により糸取り量を増大することなく円滑に
縁部に案内されるので、往動時の糸取り量を変え
ることができる。
In the thread take-up mechanism of the sewing machine of the present invention, when the take-up lever moves forward, the engaging surface of the recess engages the needle thread and pulls it up to increase the amount of thread taken up. When the needle thread goes over the edge and is guided by the edge and reaches the backward movement state, the needle thread is smoothly guided to the edge by the guide surface of the recess without increasing the amount of thread taken up. It can be changed.
以下、第４図〜第９図に基づいて請求項１及び
請求項３に記載の発明の実施例を説明する。
Hereinafter, embodiments of the invention according to claims 1 and 3 will be described based on FIGS. 4 to 9.
第４図において５はミシンモータと連動して回
転する主軸で、ミシン機枠に回転可能に支持され
ている。６はミシン機枠に回動可能に支持時した
クランク軸で、前記主軸５とはクランク腕７Ａを
介して連結されている。そして、主軸５の回転に
よつてクランク軸６が往復回動する。 In FIG. 4, a main shaft 5 rotates in conjunction with the sewing machine motor, and is rotatably supported by the sewing machine frame. A crankshaft 6 is rotatably supported on the sewing machine frame, and is connected to the main shaft 5 via a crank arm 7A. The rotation of the main shaft 5 causes the crankshaft 6 to reciprocate.
７は中間部をクランク軸６に回動可能に支持
し、左端をミシン機枠に回動可能に支持した案内
杆８に軸方向に移動可能に遊嵌し、右端部に二又
部９を設けた針棒駆動腕である。 7 has an intermediate portion rotatably supported on the crankshaft 6, a left end rotatably supported on the sewing machine frame, and a guide rod 8 that is movably fitted in the axial direction, and a forked portion 9 on the right end. This is the needle bar drive arm provided.
１１はミシン機枠に固定した案内棒１０に上下
動可能に遊嵌し、下部に針Ｎを設けた針棒だきで
ある。 Reference numeral 11 denotes a needle bar holder which is loosely fitted into a guide bar 10 fixed to the sewing machine frame so as to be movable up and down, and has a needle N provided at its lower part.
第５図に示す如く、１２，１２はミシン機枠に
固定した針糸案内でミシンの糸巻（図示せず）か
ら針Ｎに至る針糸経路中のミシン機枠に設けてあ
る。 As shown in FIG. 5, reference numerals 12, 12 are needle thread guides fixed to the sewing machine frame, and are provided on the sewing machine frame in the needle thread path from the sewing machine bobbin (not shown) to the needle N.
１３は基端を針棒だき１１に固定し、自由端に
形成した山型状の縁部１３Ａを糸案内１２，１２
に張架した針糸NTと当接する位置に配置したカ
ム状天秤である。 13 has its base end fixed to the needle bar holder 11, and the chevron-shaped edge 13A formed at the free end is connected to the thread guides 12, 12.
This is a cam-shaped thread take-up placed in a position where it comes into contact with the needle thread NT suspended in the thread.
１４はカム状天秤１３の針側の縁部１３Ａに形
成した凹部で、カム状天秤１３の往動時には針糸
NTを所定量繰り出した後、前記縁部１３Ａに針
糸を案内する掛合面部１４Ａと複動時に針糸NT
を円滑に前記縁部１３Ａ上に案内する案内面部１
４Ｂとで構成される。 Reference numeral 14 denotes a recess formed in the edge 13A of the needle side of the cam-like take-up lever 13, and when the cam-like take-up take-up 13 moves forward, the needle thread
After feeding out a predetermined amount of NT, the engaging surface portion 14A guides the needle thread to the edge 13A, and the needle thread NT during double action.
a guide surface portion 1 that smoothly guides the material onto the edge portion 13A;
It consists of 4B.
尚、この掛合面部１４Ａはカム状天秤の移動方
向に対してほぼ90゜となるように形成されている。
また、カム状天秤１３を針Ｎを固定した針棒に設
けてもよい。 Incidentally, this engaging surface portion 14A is formed at an angle of approximately 90° with respect to the moving direction of the cam-like balance.
Further, the cam-like balance 13 may be provided on a needle bar to which the needle N is fixed.
１５は基端をミシン機枠に支持し、自由端にカ
ム状天秤１３の掛合面部１４Ａに掛合した針糸
NTと当接して、針糸NTを強制的にカム状天秤
１３の縁部１３Ａ上に案内する傾斜面１５Ａを形
成した案内部材である。 15 is a needle thread whose base end is supported on the sewing machine frame and whose free end is engaged with the engagement surface 14A of the cam-like thread take-up 13.
This guide member is formed with an inclined surface 15A that comes into contact with the needle thread NT and forcibly guides the needle thread NT onto the edge 13A of the cam-like thread take-up 13.
次にこの実施例の作用を説明する。 Next, the operation of this embodiment will be explained.
第６図に示すように天秤１３の往動時には天秤
１３の凹部１４の掛合面部１４Ａが糸案内１２，
１２に架設した針糸NTと掛合し、針糸NTを繰
り出す。このため第７図に示すように糸取り量が
増大する。針糸NTは天秤の往動によつて傾斜面
１５Ａにも案内され、この傾斜面１５Ａに沿つて
掛合面部１４Ａから抜け出すように案内される。 As shown in FIG. 6, when the thread take-up 13 moves forward, the engagement surface 14A of the recess 14 of the thread take-up 13 is connected to the thread guide 12,
It engages with the needle thread NT installed at 12 and lets out the needle thread NT. Therefore, as shown in FIG. 7, the amount of yarn taken up increases. The needle thread NT is also guided to the inclined surface 15A by the forward movement of the thread take-up, and is guided along this inclined surface 15A so as to escape from the engaging surface portion 14A.
このため、所定量糸が繰り出されると第８図に
示すように傾斜面１５Ａによつて針糸NTは掛合
面部１４Ａから強制的に縁部１３Ａ上に案内され
ることになる。このため第７図に示すように糸取
り量は急激に減少する。 Therefore, when a predetermined amount of thread is let out, the needle thread NT is forcibly guided from the engaging surface 14A onto the edge 13A by the inclined surface 15A, as shown in FIG. Therefore, as shown in FIG. 7, the thread take-up amount decreases rapidly.
天秤１３が往動から今度は復動に至る時には第
５図に示すように凹部１４の案内面部１４Ｂによ
つて針糸が案内されるため円滑に縁部１３Ａに案
内され第７図に示すように復動時に於て針糸NT
の繰り出しは急激になされず糸取り量も増大しな
い。 When the thread take-up 13 moves from the forward motion to the backward motion, the needle thread is guided by the guide surface 14B of the recess 14 as shown in FIG. 5, so that it is smoothly guided to the edge 13A, as shown in FIG. Needle thread NT during return movement
The yarn is not suddenly fed out, and the amount of yarn taken up does not increase.
尚、案内部材１５は確実に針糸NTを掛合面部
１４Ａから抜け出すためのものであり、掛合面部
１４Ａの傾斜角を針糸NTが所定量繰り出された
ら天秤１４の移動につれて、自動的に掛合面部１
４Ａからはずれる構成にすれば案内部材１５は必
要としなくともこの発明の効果を奏する。 Note that the guide member 15 is for ensuring that the needle thread NT comes out of the engaging surface portion 14A, and automatically changes the inclination angle of the engaging surface portion 14A to the engaging surface portion as the thread take-up 14 moves when the needle thread NT has been paid out by a predetermined amount. 1
If the configuration is different from 4A, the effects of the present invention can be achieved without the need for the guide member 15.
第９図はこの発明の他の実施例を示すもので請
求項２に記載の発明の実施例である。この実施例
においては、主軸１６にクランク腕１７を介して
ミシン機枠に揺動可能に連結した布の切断する上
メス１８の揺動腕１９にカム状天秤１３を支持し
た構成であり、上メス１８の上下動に関連して天
秤１３が往復動し、糸案内１２，１２に架設した
針糸NTと掛合し、第７図に示すような糸取り量
を奏するようになつている。 FIG. 9 shows another embodiment of the present invention, which is an embodiment of the invention set forth in claim 2. In this embodiment, a cam-like take-up lever 13 is supported on a swinging arm 19 of an upper knife 18 for cutting cloth, which is swingably connected to a main shaft 16 via a crank arm 17 to a sewing machine frame. The thread take-up 13 reciprocates in conjunction with the vertical movement of the knife 18 and engages with the needle thread NT installed on the thread guides 12, 12, thereby producing a thread take-up amount as shown in FIG.
この実施例においても前述と同様に案内部材１
５（請求項３に記載）を設ければ確実に針糸NT
をカム状天秤１３の掛合面部１４Ａから縁部１３
Ａ上に抜け出す様に案内することができる。 In this embodiment as well, the guide member 1
5 (described in claim 3) will ensure that the needle thread NT
from the engagement surface 14A of the cam-shaped balance 13 to the edge 13
You can guide them to escape above A.
以上述べたように、この発明によればカム状天
秤に設けた掛合面部と案内面部よりなる凹部によ
り、カム状天秤の往動時と復動時の糸取り量を可
変することができるので、糸切れを防止し、最適
の縫目状態で縫合することができるという効果を
奏する。
As described above, according to the present invention, the amount of thread taken up during the forward and backward movements of the cam-like take-up can be varied by the recess formed by the engagement surface and the guide surface provided on the cam-like take-up. This has the effect of preventing breakage and making it possible to sew in an optimal seam state.
更に又、案内部材により確実に針糸を天秤の掛
合面部から縁部に移動することができるという効
果を奏する。 Furthermore, there is an effect that the guide member can reliably move the needle thread from the engagement surface of the thread take-up to the edge.
第１図は従来例の斜視図、第２図は従来のカム
状天秤の要部斜視、第３図は従来の糸取り量のグ
ラフ、第４図はこの発明の一実施例の斜視図、第
５図及び第６図はこの発明の一実施例の作用説明
図、第７図はこの発明の糸取り量のグラフ、第８
図はこの発明の一実施例の作用説明図、第９図は
この発明の他の実施例の斜視図である。
１１…針棒だき、１２…糸案内、１３…カム状
天秤、１４…凹部、１４Ａ…掛合面部、１４Ｂ…
案内面部、１５…案内部材、１８…上メス。
Fig. 1 is a perspective view of a conventional example, Fig. 2 is a perspective view of the main part of a conventional cam-shaped thread take-up, Fig. 3 is a graph of the conventional thread take-up amount, and Fig. 4 is a perspective view of an embodiment of the present invention. 5 and 6 are action explanatory diagrams of an embodiment of the present invention, FIG. 7 is a graph of the thread take-up amount of the present invention, and FIG.
The figure is an explanatory view of the operation of one embodiment of the invention, and FIG. 9 is a perspective view of another embodiment of the invention. DESCRIPTION OF SYMBOLS 11... Needle bar holder, 12... Thread guide, 13... Cam-shaped take-up lever, 14... Recessed part, 14A... Engagement surface part, 14B...
Guide surface portion, 15...Guide member, 18...Upper knife.
Claims (1)
して往復動する往復動部材と、 針棒だきの先端に設けた針と、 ミシン機枠に固定し、針糸を張架する糸案内
と、 基端前記往復動部材に固定し、縁部を糸案内に
張架した針糸と当接する位置に配したカム状天秤
と、 カム状天秤の縁部に形成しカム状天秤の往動時
には針糸と掛合し針糸を所定量繰り出す掛合面部
と復動時には針糸を円滑に前記縁部に案内する案
内面部とよりなる凹部を備えて成るミシンの天秤
機構。 ２ 前記往復動部材は針を設けた針棒だき又は布
を切断する上メスである請求項１記載のミシンの
天秤機構。 ３ 前記カム状天秤は、基端をミシン機枠に支持
し、自由端にカム天秤の掛合面部に掛合した針糸
を強制的にカム状天秤の縁部に案内する傾斜面を
形成した案内部材を備えてなる請求項１ないし請
求項３のいずれかに記載のミシンの天秤機構。[Scope of Claims] 1. A reciprocating member supported on the sewing machine frame so as to be movable up and down and reciprocating in conjunction with the main shaft, a needle provided at the tip of the needle bar holder, and a needle thread fixed to the sewing machine frame. a cam-shaped thread take-up whose proximal end is fixed to the reciprocating member and whose edge is arranged in a position where it comes into contact with the needle thread stretched on the thread guide; This thread take-up mechanism for a sewing machine is provided with a recessed part consisting of an engaging face part that engages with a needle thread and lets out a predetermined amount of the needle thread when the cam-like take-up moves forward, and a guide face part that smoothly guides the needle thread to the edge part when the cam-like take-up moves backward. 2. The thread take-up mechanism for a sewing machine according to claim 1, wherein the reciprocating member is a needle bar maker equipped with a needle or an upper knife for cutting cloth. 3. The cam-shaped thread take-up is a guide member whose base end is supported on the sewing machine frame, and whose free end is formed with an inclined surface for forcibly guiding the needle thread engaged with the engagement surface of the cam-shaped thread take-up to the edge of the cam-shaped thread take-up. The thread take-up mechanism for a sewing machine according to any one of claims 1 to 3, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4697988A JPH01221197A (en) | 1988-02-29 | 1988-02-29 | Balance mechanism for sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4697988A JPH01221197A (en) | 1988-02-29 | 1988-02-29 | Balance mechanism for sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01221197A JPH01221197A (en) | 1989-09-04 |
| JPH0354599B2 true JPH0354599B2 (en) | 1991-08-20 |
Family
ID=12762351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4697988A Granted JPH01221197A (en) | 1988-02-29 | 1988-02-29 | Balance mechanism for sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01221197A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106868735B (en) * | 2017-04-01 | 2022-04-12 | 杰克科技股份有限公司 | Automatic thread trimming mechanism and sewing machine |
-
1988
- 1988-02-29 JP JP4697988A patent/JPH01221197A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01221197A (en) | 1989-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5131340A (en) | Selective thread cutting device in a sewing machine | |
| JP2009061020A (en) | Thread cutting apparatus for sewing machine | |
| US3489115A (en) | Device for simultaneously cutting the sewing threads in a sewing machine | |
| US3709176A (en) | Underbed thread trimming mechanism for sewing machines | |
| US4586449A (en) | Thread cutting devices for double lockstitch sewing machines | |
| JP2003326059A (en) | Needle feed sewing machine | |
| US4252072A (en) | Device for forming a double chain stitch in a sewing machine | |
| JPH0354599B2 (en) | ||
| US4285291A (en) | Needle guard for sewing machines | |
| US4522135A (en) | Looper and cam assembly for chain stitch sewing machine | |
| US3150622A (en) | Reverse feed two thread chainstitch sewing machines | |
| JP2546453B2 (en) | Sewing machine thread holding and holding device | |
| US472094A (en) | Island | |
| US4757776A (en) | Thread pull-out mechanism for a sewing machine | |
| JP2650515B2 (en) | Sewing machine looper structure | |
| KR940011593B1 (en) | Overlock swing device for use in sewing machine | |
| JPH0532076Y2 (en) | ||
| JPH02134Y2 (en) | ||
| JPH0719434Y2 (en) | sewing machine | |
| JPH0759266B2 (en) | Bobbin thread cutting device for sewing machine | |
| JPH0117262Y2 (en) | ||
| US472095A (en) | Island | |
| US765120A (en) | Chain-stitch sewing-machine. | |
| JPH0220277B2 (en) | ||
| JPH0214774Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |