JPH01212595A - Thread drawing-out control device of sewing-machine - Google Patents

Thread drawing-out control device of sewing-machine

Info

Publication number
JPH01212595A
JPH01212595A JP3771388A JP3771388A JPH01212595A JP H01212595 A JPH01212595 A JP H01212595A JP 3771388 A JP3771388 A JP 3771388A JP 3771388 A JP3771388 A JP 3771388A JP H01212595 A JPH01212595 A JP H01212595A
Authority
JP
Japan
Prior art keywords
thread
amount
sewing
needle
feed
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
Application number
JP3771388A
Other languages
Japanese (ja)
Other versions
JP2646617B2 (en
Inventor
Kenji Matsubara
松原 憲司
Fujio Horie
堀江 不二夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to JP63037713A priority Critical patent/JP2646617B2/en
Publication of JPH01212595A publication Critical patent/JPH01212595A/en
Application granted granted Critical
Publication of JP2646617B2 publication Critical patent/JP2646617B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To obtain a good thread behavior as soon as possible after the sewing work is started by driving and controlling an electromagnetic actuator to draw out the corrected amount of thread while a control device is receiving the direction to correct from a thread amount correction device. CONSTITUTION:A thread drawing-out device 45 of a sewing-machine draws out a specific amount of upper thread 76 from a thread bridge 4. A thread drawing-out timing signal generator 87 outputs a thread drawing-out timing signal to CPU 91 at every specific timing, and a needle position signal generator 88 outputs a needle-up position signal, and a needle-down position signal. A control device C is composed of CPU 91, ROM 92, and RAM 93, and the RAM 93 furnishes the first memory M1 to store the loosening amount of the remaining upper thread while renewing in order, and a memory M2 to store the computed necessary thread amount N. By such a constitution, since the upper thread 76 is corrected and controlled to stop the drawing-out from the thread bridge 4 until the loosened amount of the upper thread 76 in the thread passage in the downstream of a thread gearing body is consumed perfectly, a good thread behavior can be obtained from the very early time.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はミシンの糸繰出し制御装置に関し、特に新規の
縫製作業を開始したときには、上糸の弛みを消費するま
で上糸の繰出し量を補正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 thread payout control device for a sewing machine, and in particular, when starting a new sewing operation, the amount of needle thread payout is corrected until the slack of the needle thread is consumed. Regarding what you choose to do.

〔従来技術〕[Prior art]

一般に、直線縫いゃジグザグ縫いなどの実用縫い或いは
文字や記号などの模様縫いをするときに、少なくとも縫
製する加工布の布厚や送り量や針振り量などに基いて次
の縫目形成に必要な上糸量を演算により決定し、その決
定された必要糸量を糸駒から天秤に繰出す糸繰出し装置
を備えた自動糸調子ミシンが提案されている。
In general, when sewing practical stitches such as straight stitches and zigzag stitches, or stitching patterns such as letters and symbols, at least the amount necessary for forming the next stitch is determined based on the thickness of the fabric to be sewn, feed rate, needle swing rate, etc. An automatic thread tension sewing machine has been proposed that is equipped with a thread feeding device that calculates the required amount of needle thread and feeds out the determined required thread amount from a thread spool to a thread take-up.

例えば、特開昭56−31788号公報には、糸駒から
天秤を介して縫針に至る糸道経路のうちの糸駒から天秤
に至る糸道経路部分の近傍の機枠にステッピングモータ
を取付け、バネで付勢された回動レバーの自由端に取付
けられた押圧ローラがステッピングモータの出力軸に固
着した駆動ローラに常に押圧するようにし、押圧ローラ
と駆動ローラとの間に上糸を押圧挟持した状態でミシン
モータの駆動が開始された後、天秤が最上位置から下降
する下降途中の所定のタイミングで演算制御装置で演算
された必要糸量に基いてステッピングモータが回転駆動
され、次の縫目形成に必要な糸量だけ糸駒から天秤の方
へ繰出すようにした上糸供給制御装置を設けたミシンの
自動糸調子装置が記載されている。
For example, Japanese Patent Application Laid-open No. 56-31788 discloses that a stepping motor is attached to the machine frame near the thread path from the thread spool to the thread take-up, of the thread path from the thread spool to the sewing needle via the thread take-up. A pressure roller attached to the free end of a rotating lever biased by a spring always presses against a drive roller fixed to the output shaft of the stepping motor, and the upper thread is pressed between the pressure roller and the drive roller. After the sewing machine motor starts driving in this state, the stepping motor is driven to rotate based on the required thread amount calculated by the arithmetic and control unit at a predetermined timing while the thread take-up is descending from the highest position. An automatic thread tension device for a sewing machine is described which is equipped with an upper thread supply control device that allows an amount of thread necessary for forming stitches to be fed from a thread spool toward a take-up thread.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

前記特開昭56−31788号公報に記載のミシンの自
動糸調子装置においては、上糸を色や太さが異なる別の
上糸に交換したとき或いは加工布を別の加工布に交換し
たときには、上糸供給制御装置の駆動ローラと押圧ロー
ラとの挟持点から糸取りバネ及び天秤を介して縫針の目
孔に至る上糸には必ず弛みが生じる。この状態で縫目形
成に必要な糸量を糸駒から順次繰出しつつ縫製するとき
には、この弛んだ上糸量が消費されるまで上糸と下糸と
の結節点が下糸側に寄った下糸調子で且つ糸引き締めが
緩い状態で縫製されるという問題がある。また、上糸の
太さや種類によって弛み量が異なり、弛み量が大きいと
きには下糸調子で且つ糸引き締めが緩い状態で縫製され
る縫目数が非常に多くなるという問題がある。
In the automatic thread tension device of the sewing machine described in the above-mentioned Japanese Patent Application Laid-Open No. 56-31788, when the needle thread is replaced with a needle thread of a different color or thickness, or when the work cloth is replaced with another work cloth, The needle thread inevitably becomes slack as it travels from the nipping point between the drive roller and the pressure roller of the needle thread supply control device to the eye of the sewing needle via the thread take-up spring and thread take-up thread. In this state, when sewing while sequentially paying out the amount of thread necessary to form a seam from the thread spool, the knotting point of the upper thread and bobbin thread is moved toward the bobbin thread side until the slack needle thread amount is used up. There is a problem in that sewing is performed with the thread tension set and the thread tightening loose. Further, the amount of slack varies depending on the thickness and type of the needle thread, and when the amount of slack is large, there is a problem in that the number of stitches to be sewn with the bobbin thread tension and thread tightening becomes very large.

本発明の目的は、糸駒から上糸を繰出す糸繰出し装置以
降の上糸に生じた弛みを消費するまで上糸の繰出し量を
補正することにより、縫製を開始した後極力早い時期か
ら良好な糸調子にし得るミシンの糸繰出し制御装置を提
供することにある。
An object of the present invention is to correct the amount of needle thread being fed out until the slackness that has occurred in the needle thread after the thread feeding device that feeds out the needle thread from the thread spool is consumed, so that sewing can be carried out as quickly as possible after sewing has started. To provide a thread pay-out control device for a sewing machine that can adjust the thread tension.

〔課題を解決するための手段〕[Means to solve the problem]

本発明に係るミシンの糸繰出し制御装置は、第1図の機
能ブロック図に示すように、糸供給源から糸取上体を経
て縫針に至る糸道経路中の糸供給源から糸取上体に至る
部分に設けられ、電磁アクチュエータで駆動される糸係
合体により上糸を糸供給源から繰出して糸取上体の方へ
供給する糸繰出し手段と、各縫目形成毎に少な(とも送
り量と針振り量と市原に基いて必要な糸量を演算する糸
量演算手段と、糸量演算手段で決定された必要糸量を繰
出すようにミシンモータの回転に調時して前記電磁アク
チュエータを所定のタイミングで駆動制御する制御手段
とを備えたミシンにおいて、糸係合体以降の上糸に弛み
が生じる新規の縫製作業の開始を検出する縫製開始検出
手段と、縫製開始検出手段により検出され一新規の縫製
作業の開始から、弛んだ上糸が縫目形成によって消費さ
れるまでの間、電磁アクチュエー゛夕で繰出す糸繰出し
量を補正するように制御手段に指令する糸量補正手段と
を備えたものである。
As shown in the functional block diagram of FIG. 1, the thread feed-out control device for a sewing machine according to the present invention includes a thread supply source, a thread take-up body, and a thread guide in a thread path from a thread supply source to a thread take-up body and a sewing needle. The needle thread is fed from the thread supply source to the thread take-up body by a thread engaging body driven by an electromagnetic actuator. a thread amount calculation means for calculating the required amount of thread based on the amount of yarn, needle swing amount, and Ichihara; In a sewing machine equipped with a control means for driving and controlling an actuator at a predetermined timing, a sewing start detection means detects the start of a new sewing operation in which an upper thread after a thread engagement member becomes slack, and a sewing start detection means detects the start of a new sewing operation. and a thread amount correction means for instructing the control means to correct the amount of thread fed out by the electromagnetic actuator from the start of a new sewing operation until the slack needle thread is consumed by stitch formation. It is equipped with the following.

〔作用〕[Effect]

本発明に係るミシンの糸繰出し制御装置においては、ミ
シンモータが駆動され縫製が開始され、縫製開始検出手
段により糸係合体以降の上糸に弛みが生じる新規の縫製
作業の開始が検出されたときには、糸量補正手段は、新
規の縫製作業の開始から弛んだ上糸を縫目形成によって
消費するまでの間、糸繰出し手段の電磁アクチュエータ
で繰出す糸繰出し量を補正するように制御手段に指令す
る。その結果、制御手段は、糸量補正手段がら補正の指
令を受けている間、糸量演算手段で決定される必要糸量
を補正して糸を繰出すように電磁アクチュエータを所定
のタイミングで駆動制御する。
In the thread feeding control device for a sewing machine according to the present invention, when the sewing machine motor is driven to start sewing, and the sewing start detection means detects the start of a new sewing operation in which the needle thread after the thread engaging body becomes slack, The thread amount correction means instructs the control means to correct the amount of thread fed out by the electromagnetic actuator of the thread feeding means, from the start of a new sewing operation until the loosened needle thread is consumed by stitch formation. do. As a result, while receiving the correction command from the yarn amount correction means, the control means drives the electromagnetic actuator at a predetermined timing so as to correct the necessary yarn amount determined by the yarn amount calculation means and pay out the yarn. Control.

制御手段は、糸量補正手段から補正の指令を受けている
間、補正した糸量を繰出すように電磁アクチュエータを
駆動制御するので、補正された糸量分が縫目毎に上糸の
弛み量から差し引がれることになり、上糸に生じた弛み
を少ない縫目数で消費することができる。
The control means drives and controls the electromagnetic actuator to pay out the corrected thread amount while receiving the correction command from the thread amount correction means, so that the corrected thread amount is used to reduce the slack of the upper thread for each stitch. This will be subtracted from the amount, and the slack in the upper thread can be used up with fewer stitches.

〔発明の効果〕〔Effect of the invention〕

本発明に係るミシンの糸繰出し制御装置によれば、以上
説明したように、縫製開始検出手段により新規の縫製作
業の開始が検出されたときには、制御手段は、糸量補正
手段から補正の指令を受けている間、補正した糸量を繰
出すように電磁アクチュエータを駆動制御するので、補
正された糸景分が縫目毎に上糸の弛み量から差し引かれ
ることになる、つまり、少ない縫目数で上糸の弛み量を
消費でき、縫製を開始した後極力早い時期から良好な糸
調子にすることができる。
According to the thread payout control device for a sewing machine according to the present invention, as explained above, when the start of a new sewing operation is detected by the sewing start detection means, the control means receives a correction command from the thread amount correction means. Since the electromagnetic actuator is driven and controlled so as to pay out the corrected thread amount while it is being fed, the corrected thread pattern is subtracted from the needle thread slack amount for each stitch, which means fewer stitches. The amount of slack in the upper thread can be consumed by the number of threads, and the thread tension can be maintained at a good level as soon as possible after sewing has started.

〔実施例〕〔Example〕

以下、本発明の実施例を図面に基いて説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第2図は本発明を適用した電子制御式ジグザグミシンを
示すものである。
FIG. 2 shows an electronically controlled zigzag sewing machine to which the present invention is applied.

このミシンMのアーム部16内には針棒上下駆動装置と
針棒揺動駆動装置とが組み込まれ、ベツド部12内には
布送り用の送り歯の上下動のための上下送り駆動装置と
送り歯の前後動のための前後送り駆動装置とが組み込ま
れており、針棒揺動駆動装置は制御装置Cで制御される
針棒揺動用パルスモータ80で駆動される。前後送り駆
動装置は制御装置Cで制御される送り用パルスモータ8
2(第5図参照)と送り用パルスモータ82に連結され
た送り調節器(図示略)と送り調節器に係合する角駒(
図示略)とリンク機構と送り歯などを備えており、送り
用パルスモータ82で駆動される送り調節器の傾きによ
り発生する角駒の水平運動で送り歯が前後に駆動される
A needle bar vertical drive device and a needle bar swing drive device are incorporated in the arm portion 16 of this sewing machine M, and a vertical feed drive device and a needle bar swing drive device for vertically moving the feed dog for fabric feeding are incorporated in the bed portion 12. A back-and-forth feed drive device for moving the feed dog back and forth is incorporated, and the needle bar swing drive device is driven by a needle bar swing pulse motor 80 controlled by the control device C. The back and forth feed drive device is a feed pulse motor 8 controlled by a control device C.
2 (see FIG. 5), a feed adjuster (not shown) connected to the feed pulse motor 82, and a square piece (not shown) that engages with the feed adjuster.
(not shown), a link mechanism, a feed dog, etc., and the feed dog is driven back and forth by the horizontal movement of the square piece generated by the inclination of the feed adjuster driven by the feed pulse motor 82.

このミシンMの機枠10には、所望の模様を選択するテ
ンキーからなる模様選択スイッチ36、縫製速度を低速
から高速に亙って変更し得るスピードボリューム32、
縫製運転を開始或いは停止させるためのスタート/スン
プスイッチ20、縫製運転を停止させるときの縫針22
の停止位置を針下停止位置または計上停止位置に切り換
えて選択する針停止位置選択スイッチ34、形成される
縫目の糸調子を「弱」から「強」に亙って調節するため
の糸調子信号を出力する糸調子マニュアルスイッチ44
が設けられている。
The machine frame 10 of this sewing machine M includes a pattern selection switch 36 consisting of a numeric keypad for selecting a desired pattern, a speed volume 32 that can change the sewing speed from low to high speed,
Start/sump switch 20 for starting or stopping sewing operation, sewing needle 22 for stopping sewing operation
A needle stop position selection switch 34 is used to switch the stop position between the needle down stop position and the counting stop position, and a thread tension switch 34 is used to adjust the thread tension of the stitches being formed from "weak" to "strong". Thread tension manual switch 44 that outputs a signal
is provided.

針棒24の下端には縫針22が取付けられ、その針棒2
4の後方において昇降可能な押え棒28の下端には押え
足26が取付けられ、送り歯は押え足26と協働して加
工布を前後方向に移送する。
A sewing needle 22 is attached to the lower end of the needle bar 24.
A presser foot 26 is attached to the lower end of a presser bar 28 that is movable up and down at the rear of the presser foot 4, and the feed dog cooperates with the presser foot 26 to transport the work cloth in the front-back direction.

第3図に示すように、押え棒28を下降させて押え足2
6が送り歯を押圧する縫製位置と押え棒28を上昇させ
て押え足26が送り歯から離隔する休止位置とに亙って
押え棒28を図示しないカムにより上下駆動させる操作
レバー8が設けられている。押え棒28の中間部にはう
ツク6が固着され、ポテンショメータなどで構成される
布厚検出器38はその出力軸に固着したギヤ7がラック
6に噛み合うように機枠10に取付けられており、この
布厚検出器38は押え足26と送り歯との間に挟持され
縫製される加工布の霜厚に応じた布厚信号を出力する。
As shown in FIG. 3, lower the presser bar 28 and presser foot 2
An operating lever 8 is provided that drives the presser bar 28 up and down by a cam (not shown) between a sewing position where the presser foot 26 presses the feed dog and a rest position where the presser foot 26 is raised and the presser foot 26 is separated from the feed dog. ing. A hook 6 is fixed to the middle part of the presser bar 28, and a cloth thickness detector 38, which is composed of a potentiometer or the like, is attached to the machine frame 10 so that a gear 7 fixed to its output shaft meshes with the rack 6. The cloth thickness detector 38 is held between the presser foot 26 and the feed dog and outputs a cloth thickness signal corresponding to the frost thickness of the work cloth to be sewn.

次に、アーム部16内における糸駒4から天秤30に至
る糸道経路部分に設けられ、糸駒4から所定量の上糸7
6(糸供給源)を繰出す糸繰出し装置45について、第
4図に基いて説明する。
Next, a predetermined amount of upper thread 7 is provided in the thread path from the thread spool 4 to the thread take-up lever 30 in the arm portion 16.
6 (yarn supply source) will be explained based on FIG. 4.

機枠10には取付は台46が固着され、この取付は台4
6にはパルスモータ48がビス50で取付けられ、パル
スモータ48の出力軸48aには出力ギヤ52が固着さ
れている。出力ギヤ52に噛み合う駆動ギヤ54は回転
軸56により取付は台46に回転可能に枢支されている
0回転軸56には駆動ローラ58が固着され、駆動ロー
ラ58は駆動ギヤ54と一体に回転するように構成され
ている。
A mounting base 46 is fixed to the machine frame 10;
A pulse motor 48 is attached to 6 with screws 50, and an output gear 52 is fixed to an output shaft 48a of the pulse motor 48. A drive gear 54 that meshes with the output gear 52 is mounted on a rotation shaft 56 and is rotatably supported on a base 46. A drive roller 58 is fixed to the zero rotation shaft 56, and the drive roller 58 rotates together with the drive gear 54. is configured to do so.

揺動レバー60は取付は台46に固着された枢支軸62
に回転可能に枢支され、この揺動レバー60には第1腕
部60a、第2腕部60b及び第3腕部60cが夫々形
成されている。第1腕部60aと取付は台46とに亙っ
て引張りバネ64が掛装されており、揺動レバー60は
常に反時計方向に回動付勢されている。第2腕部60b
には略三角形状のローラホルダ68の一端が枢支軸66
により回動可能に枢支され、ローラホルダ68の他端部
はそれに形成された長孔に回転軸56が挿通している。
The swing lever 60 is mounted on a pivot shaft 62 fixed to the base 46.
The swing lever 60 is rotatably supported by the swing lever 60, and the swing lever 60 is formed with a first arm 60a, a second arm 60b, and a third arm 60c, respectively. A tension spring 64 is hung between the first arm portion 60a and the mounting base 46, and the swing lever 60 is always urged to rotate counterclockwise. Second arm portion 60b
One end of the approximately triangular roller holder 68 is connected to the pivot shaft 66.
The other end of the roller holder 68 has a rotation shaft 56 inserted into a long hole formed therein.

そして、このローラホルダ68の他端部の近傍部にはゴ
ム製の従動ローラ70がローラホルダ68に固着した枢
支軸72に回転可能に枢支されると共に、ゴム製の従動
ローラ71がローラホルダ68に固着した枢支軸73に
回転可能に枢支されている。従って、揺動レバー60の
反時計方向への回動付勢により、一対の従動ローラ70
・71はローラホルダ68を介して矢印74方向に付勢
され、駆動ローラ58に押圧するように構成されている
。第3腕部60cは押え棒28に作動的に連結されてお
り、操作レバー8を操作して押え足26を休止位置へ上
昇させたときには、揺動レバー60は引張りバネ64の
バネ力に抗して時計方向に回動し、一対の従動ローラ7
0・71は駆動ローラ58から夫々離隔する。尚、駆動
ローラ58と一対の従動ローラ70・71とで糸係合体
が構成されている。
In the vicinity of the other end of the roller holder 68, a rubber driven roller 70 is rotatably supported on a pivot shaft 72 fixed to the roller holder 68, and a rubber driven roller 71 is rotatably supported on a pivot shaft 72 fixed to the roller holder 68. It is rotatably supported on a pivot shaft 73 fixed to the holder 68. Therefore, by urging the swing lever 60 to rotate in the counterclockwise direction, the pair of driven rollers 70
- 71 is biased in the direction of arrow 74 via the roller holder 68 and is configured to press against the drive roller 58. The third arm 60c is operatively connected to the presser foot 28, and when the operation lever 8 is operated to raise the presser foot 26 to the rest position, the swing lever 60 resists the spring force of the tension spring 64. The pair of driven rollers 7
0 and 71 are spaced apart from the drive roller 58, respectively. Note that the drive roller 58 and the pair of driven rollers 70 and 71 constitute a thread engaging body.

このとき、取付は台46に取付けられた押え足位置検出
スイッチ40の押圧部は揺動レバー60の第1腕部60
aにより押圧され、押え足位置検出スイッチ40はrH
Jレベルの押え足位置信号を出力する。また、操作レバ
ー8の操作により押え足26を縫製位置へ下降させたと
きには、押え足位置検出スイッチ40は「L」レベルの
押え足位置信号を出力する。
At this time, the pressing part of the presser foot position detection switch 40 mounted on the base 46 is attached to the first arm part 60 of the swing lever 60.
a, the presser foot position detection switch 40 is set to rH.
Outputs a J-level presser foot position signal. Further, when the presser foot 26 is lowered to the sewing position by operating the operating lever 8, the presser foot position detection switch 40 outputs a presser foot position signal at the "L" level.

ここで、第2図〜第4図に示すように、上糸76を色や
太さや種類が異なる別の上糸76に交換するとき或いは
加工布の縫製位置を変更するとき或いは加工布を別の加
工布に交換するときには、縫針22を計上位置で停止さ
せ且つ操作レバー8を操作して押え足26を休止位置に
上昇させる。
Here, as shown in FIGS. 2 to 4, when replacing the needle thread 76 with another needle thread 76 of a different color, thickness, or type, changing the sewing position of the work cloth, or sewing the work cloth separately. When replacing the work cloth with another one, the sewing needle 22 is stopped at the set position and the operating lever 8 is operated to raise the presser foot 26 to the rest position.

このとき、上糸76は糸係合体により押圧挟持されない
ので、糸駒4から糸ガイド14、駆動ローラ58と一対
の従動ローラ70・71との隙間、糸取りバネ18、天
秤30(糸取上体)を夫々経て縫針22の目孔に至る糸
道経路には、糸取りバネ18のバネ力などにより縫製時
の糸道経路における糸量よりも長い量の上糸76が供給
されており、糸道経路の上糸76には弛みが生じている
At this time, since the upper thread 76 is not pressed and held by the thread engaging body, the needle thread 76 is moved from the thread spool 4 to the thread guide 14, the gap between the drive roller 58 and the pair of driven rollers 70 and 71, the thread take-up spring 18, and the thread take-up lever 30 (thread take-up body ) to the eye of the sewing needle 22, an amount of needle thread 76 that is longer than the amount of thread in the thread path during sewing is supplied by the spring force of the thread take-up spring 18, etc. There is slack in the upper thread 76 in the path.

尚、縫針22が針上停止位置のときには、天秤30は最
上位置に位置している。
Note that when the sewing needle 22 is at the needle-up stop position, the thread take-up 30 is located at the uppermost position.

そして、この状態で操作レバー8を操作して押え足26
を縫製位置に下降させ、新規の縫製作業を開始するとき
には、前記糸係合体以降の糸道経路部分の上糸76には
弛みが生じた状態である。
Then, in this state, operate the operating lever 8 to presser foot 26.
When the needle thread 76 is lowered to the sewing position and a new sewing operation is started, the needle thread 76 in the thread path portion after the thread engaging body is in a slack state.

次に、ミシンMの制御系の全体構成について、第5図の
ブロック図に基いて説明する。
Next, the overall configuration of the control system of the sewing machine M will be explained based on the block diagram of FIG. 5.

前記針棒揺動駆動装置の針棒揺動用パルスモータ80と
パルスモータドライバ81とが設けられ、送り歯の前後
送り駆動装置の送り用パルスモータ82とパルスモータ
ドライバ83とが設けられ、前記パルスモータ48には
パルスモータドライバ84が設けられ、 針棒24を上
下駆動し且つ送り歯を上下送り駆動するミシンモータ8
5とミシンモータドライバ86も設けられている。
A needle bar swinging pulse motor 80 and a pulse motor driver 81 of the needle bar swinging drive device are provided, a feeding pulse motor 82 and a pulse motor driver 83 of the forward and backward feeding drive device of the feed dog are provided, and the The motor 48 is provided with a pulse motor driver 84, which is a sewing machine motor 8 that drives the needle bar 24 up and down and drives the feed dog up and down.
5 and a sewing machine motor driver 86 are also provided.

フォトインクラブタからなる糸繰出しタイミング信号発
生器87は、ミシン主軸の回転に調時して天秤30が最
上位置から下降する下降途中の所定の一タイミング毎に
糸繰出しタイミング信号(パルス信号)をCPU91に
出力し、フォトインタラプタからなる針位置信号発生器
88は、ミシン主軸の回転に調時して縫針22の計上位
置つまり約60度の位相のとき(縫針22の最上位置を
0度の位相としたとき)に計上位置信号を出力し、また
縫針22の針下位置つまり約180度の位相のときに針
下位置信号を出力する。
The thread payout timing signal generator 87, which is made of a photo ink rubber, generates a thread payout timing signal (pulse signal) at every predetermined timing during the downward movement of the thread take-up lever 30 from the uppermost position in synchronization with the rotation of the main shaft of the sewing machine. The needle position signal generator 88, which is output to the CPU 91 and consists of a photointerrupter, synchronizes with the rotation of the main shaft of the sewing machine, and when the sewing needle 22 is at the recorded position, that is, at a phase of about 60 degrees (the uppermost position of the sewing needle 22 is at a phase of 0 degrees), When the sewing needle 22 is at the needle-down position, that is, when the phase is about 180 degrees, the needle-down position signal is output.

布厚検出器38は、A/D変換器89を介してCPU9
1に有産に応じた霜厚信号を出力する。
The cloth thickness detector 38 is connected to the CPU 9 via an A/D converter 89.
1, outputs a frost thickness signal according to the fruitfulness.

ポテンショメータなどからなるスピードボリューム32
から出力される設定速度信号はA/D変換器90を介し
てCPU91に出力される。
Speed volume 32 consisting of potentiometer etc.
A set speed signal outputted from the CPU 91 is outputted to the CPU 91 via the A/D converter 90.

パルスモータドライバ81・83・84、ミシンモータ
ドライバ86、A/D変換器89・90、押え足位置検
出スイッチ40、糸調子マニュアルスイッチ44、糸繰
出しタイミング信号発生器87、針位置信号発生器88
、模様選択スイッチ36、スタート/ストップスイッチ
20、針停止位置選択スイッチ34は夫々CPU91に
接続されている。
Pulse motor drivers 81, 83, 84, sewing machine motor driver 86, A/D converters 89, 90, presser foot position detection switch 40, thread tension manual switch 44, thread payout timing signal generator 87, needle position signal generator 88
, pattern selection switch 36, start/stop switch 20, and needle stop position selection switch 34 are each connected to the CPU 91.

制御装置CはCPU (中央演算装置)91と、そのC
PU91にデータバスなどを介して接続されたROM 
(リード・オンリ・メモリ)92及びRAM (ランダ
ム・アクセス・メモリ)93とから構成されている。
The control device C includes a CPU (central processing unit) 91 and its C
ROM connected to PU91 via data bus etc.
(read-only memory) 92 and RAM (random access memory) 93.

ROM92には、多数の文字や記号やマークなどの模様
の夫々について各縫い動作毎の針棒24の揺動位置と送
り歯の送り量及び送り方向とに関するデータを模様番号
と対応させて予め入力格納している模様データメモリと
、選択された模様デ−タに基いて針棒揺動用パルスモー
タ80と送り用パルスモータ82とを夫々制御するため
の制御プログラム、スピードボリューム32から出力さ
れる設定速度信号に従い、またスタート/ストップスイ
ッチ20の操作に応じてミシンモータ85の駆動を制御
する制御プログラム、少なくとも布厚検出器38から出
力される布厚信号と模様データから出力される送り量デ
ータ及び針振り量データと糸調子マニュアルスイッチ4
4から出力される糸調子信号とに基いて各縫目形成毎に
次の縫目形成に必要な糸量を演算する糸量演算制御の制
御プログラム、後述の糸繰出し制御の制御プログラムな
どが記憶されている。
In the ROM 92, data regarding the swing position of the needle bar 24 and the feed amount and feed direction of the feed dog for each sewing operation for each pattern such as a large number of characters, symbols, and marks is input in advance in correspondence with the pattern number. A control program for controlling the needle bar swinging pulse motor 80 and the feeding pulse motor 82 based on the stored pattern data memory and the selected pattern data, and the settings output from the speed volume 32. A control program that controls the drive of the sewing machine motor 85 in accordance with the speed signal and in accordance with the operation of the start/stop switch 20, at least the fabric thickness signal output from the fabric thickness detector 38, the feed amount data output from the pattern data, and Needle swing amount data and thread tension manual switch 4
A control program for thread amount calculation control that calculates the amount of thread necessary for forming the next stitch for each stitch formation based on the thread tension signal output from 4, a control program for thread payout control described later, etc. are stored. has been done.

RAM93には、新規の縫製が開始されたときにリセッ
トされ且つ所定の上糸76の弛み量Aが縫目形成により
消費されたときにセットされる弛み量消費フラグF、縫
目形成毎に必要糸量づつ減少する残りの弛み量を順次更
新して記憶する第1メモリML糸量演算制御プログラム
により演算された必要糸量Nを記憶する第2メモリM2
、CPU9 tで演算処理した結果を一時的に記憶する
各種メモリが設けられている。
The RAM 93 stores a slack amount consumption flag F, which is reset when a new sewing starts and is set when a predetermined slack amount A of the needle thread 76 is consumed by stitch formation, and a slack amount consumption flag F that is necessary for each stitch formation. A first memory ML that sequentially updates and stores the remaining slack amount that decreases by yarn amount; a second memory M2 that stores the required yarn amount N calculated by the yarn amount calculation control program;
, various types of memories are provided to temporarily store the results of calculations performed by the CPU 9t.

次に、ミシンMの制御装置Cで行われる糸繰出し制御の
ルーチンについて、第5図のフローチャートに基いて説
明する。尚、この糸繰出し制御は、メインルーチンに対
して微小時間毎の割り込みにより実行される。
Next, a routine for thread payout control performed by the control device C of the sewing machine M will be explained based on the flowchart shown in FIG. Note that this yarn payout control is executed by interrupting the main routine at minute intervals.

この制御が開始されると先ず、上糸76を交換したり或
いは加工布の縫製位置を変更したりした後、新規の縫製
作業が開始されたか否かが判定される。即ち、針位置信
号発生器88からの計上位置信号に基いて縫針22が計
上位置であり(Sl)、且つ押え足位置検出スイッチ4
0からの押え足位置信号の信号レベルに基いて押え足2
6が休止位置のとき(S2)には、縫製作業が中断され
ており、新規の縫製作業が開始されることになる。従っ
て、このときには糸道経路の上糸76には弛みが生じて
いる。
When this control is started, first, the needle thread 76 is replaced or the sewing position of the work cloth is changed, and then it is determined whether or not a new sewing operation has been started. That is, the sewing needle 22 is at the counting position based on the counting position signal from the needle position signal generator 88 (Sl), and the presser foot position detection switch 4
Presser foot 2 based on the signal level of the presser foot position signal from 0.
When the sewing machine 6 is at the rest position (S2), the sewing work has been interrupted and a new sewing work is started. Therefore, at this time, the upper thread 76 of the thread guide path has slack.

所定の上糸76の弛み量A(例えば、約8ミリ)が第1
メモリMlに記憶され(S3)、弛み量消費フラグFが
リセットされる(S4)。
A predetermined slack amount A (for example, about 8 mm) of the upper thread 76 is the first
It is stored in the memory Ml (S3), and the slack amount consumption flag F is reset (S4).

そして、操作レバー8を操作して押え足26を縫製位置
に下降させた後、CPU9 iからミシンモータドライ
バ86に出力される駆動信号に基いて゛ミシンモータ8
5は駆動されたか否かつまり新規の縫製作業が開始され
たか否かが判定され(S5)、ミシンモータ85が駆動
されたときには糸繰出しタイミング信号発生器87から
出力されるタイミング信号に基いて、糸繰出しタイミン
グのときには(S6)布厚信号と送り量データ及び針振
り量データと糸調子信号とに基いて糸量演算制御プログ
ラムにより次の縫目に必要な糸量Nが演算され(S?)
、その決定された必要糸量Nが第2メモリM2に記憶さ
れる。
After lowering the presser foot 26 to the sewing position by operating the operating lever 8, the sewing machine motor 8 is operated based on the drive signal output from the CPU 9i to the sewing machine motor driver 86.
5 is driven or not, that is, whether or not a new sewing operation has been started (S5). When the sewing machine motor 85 is driven, based on the timing signal output from the thread payout timing signal generator 87, At the thread payout timing (S6), the thread amount N required for the next stitch is calculated by the thread amount calculation control program based on the fabric thickness signal, feed amount data, needle swing amount data, and thread tension signal (S? )
, the determined required yarn amount N is stored in the second memory M2.

弛み量消費フラグFがリセットされているときには(S
9)、第1メモリM1から決定された必要糸量Nを差し
引いた残りの弛み量を第1メモリM1に記憶させ(S1
0)、第1メモリM1に記憶した残りの弛み量が「0」
より大きいときには(S 11) 、糸繰出しタイミン
グ毎に81〜S2・86〜311が繰返される。
When the slack amount consumption flag F is reset (S
9), the remaining amount of slack after subtracting the determined necessary yarn amount N from the first memory M1 is stored in the first memory M1 (S1
0), the remaining slack amount stored in the first memory M1 is "0"
When it is larger (S11), steps 81 to S2 and 86 to 311 are repeated at each thread payout timing.

第1メモリMlに記憶した残りの弛み量が「0」以下に
なったときつまり前記糸係合体以降の糸道経路部分の上
糸76の弛みが完全に消費されたときには、弛み量消費
フラグFがセットされ(S12)、第1メモリM1に記
憶されている必要糸量Nより不足した糸量が第2メモリ
M2に記憶され(S 13) 、第2メモリM2に記憶
した不足糸量に基いてCPU91から駆動信号がパルス
モータドライバ84に出力され、パルスモータ48が回
転することにより次の縫目形成に不足した糸量だけ糸駒
4から繰出される(S14)。
When the remaining slack amount stored in the first memory Ml becomes "0" or less, that is, when the slack of the upper thread 76 in the thread path path after the thread engaging body is completely consumed, the slack amount consumption flag F is set (S12), the amount of yarn that is less than the required amount of yarn N stored in the first memory M1 is stored in the second memory M2 (S13), and the amount of yarn that is insufficient than the required amount N stored in the second memory M2 is stored (S13). Then, a drive signal is output from the CPU 91 to the pulse motor driver 84, and as the pulse motor 48 rotates, only the amount of thread insufficient to form the next stitch is let out from the thread spool 4 (S14).

以降においては、弛み糸量が消費されて弛み量消費フラ
グFがセットされているので、5l−S2・S6〜S9
・S14が繰返されることにより、糸駒4から順次繰出
された必要糸量Nで縫製される。
Thereafter, since the amount of slack thread is consumed and the slack amount consumption flag F is set, 5l-S2・S6 to S9
- By repeating S14, sewing is performed using the necessary thread amount N that is sequentially let out from the thread spool 4.

以上説明したように、上糸76を交換したり或いは加工
布の縫製位置を変更したりした後、新規の縫製作業が開
始されたときには、前記糸係合体以降の糸道経路部分の
上糸76には弛みが生じており、この弛み糸量が縫目形
成により完全に消費されるまで上糸76を糸駒4から繰
出さないように補正制御するので、少ない縫目数で上糸
76の弛み量を消費でき、縫製を開始した後極力早い時
期から良好な糸調子にす−ることができる。
As explained above, when a new sewing operation is started after replacing the needle thread 76 or changing the sewing position of the work cloth, the needle thread 76 in the thread path path after the thread engaging body is There is some slack in the needle thread, and the needle thread 76 is corrected and controlled so as not to be let out from the thread spool 4 until the amount of slack thread is completely consumed by stitch formation. The amount of slack can be used up, and good thread tension can be achieved as early as possible after sewing has started.

尚、新規の縫製作業が開始された後弛み糸量が消費され
るまで、糸繰出しタイミングにおいて必要糸量Nより設
定された糸量分生ない量の上糸76を糸駒4から繰出す
ようにしてもよい。
In addition, after a new sewing operation is started, until the amount of slack thread is consumed, the needle thread 76 is paid out from the thread spool 4 in an amount that is not equal to the amount of thread set from the required thread amount N at the thread pay-out timing. You may also do so.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の構成を示す機能ブロック図、第2図〜
第6図は本発明の実施例を示すもので、第2図は電子制
御式ジグザグミシンの正面図、第3図は前記ミシンの部
分側面図、第4図は前記ミシンのアーム部に設けられた
糸繰出し装置の平面図、第5図はミシンの制御系のブロ
ック図、第6図は糸繰出し制御のルーチンのフローチャ
ートである。 M・・ミシン、 4・・糸駒、 8・・操作レバー、 
18・・糸取りバネ、 22・・縫針、26・・押え足
、 30・・天秤、 38・・布厚検出器、 40・・
押え足位置検出スイッチ、45・・糸繰出し装置、 4
8・・パルスモータ、58・・駆動ローラ、 70・7
1・・従動ローラ、 76・・上糸、 80・82・・
パルスモータ、 85・・ミシンモータ、 87・・糸
繰出しタイミング信号発生器、 88・・針位置信号発
生器、 91・・CPU、  92・・ROM。 93・・RAM0 特許出願人  ブラザー工業株式会社
Figure 1 is a functional block diagram showing the configuration of the present invention, Figures 2-
6 shows an embodiment of the present invention, FIG. 2 is a front view of an electronically controlled zigzag sewing machine, FIG. 3 is a partial side view of the sewing machine, and FIG. FIG. 5 is a block diagram of the control system of the sewing machine, and FIG. 6 is a flowchart of a routine for controlling the thread feeding. M...Sewing machine, 4...Thread spool, 8...Operation lever,
18... Thread take-up spring, 22... Sewing needle, 26... Presser foot, 30... Balance, 38... Fabric thickness detector, 40...
Presser foot position detection switch, 45... Thread feeding device, 4
8...Pulse motor, 58...Drive roller, 70.7
1..Followed roller, 76..Upper thread, 80.82..
Pulse motor, 85...Sewing machine motor, 87...Thread payout timing signal generator, 88...Needle position signal generator, 91...CPU, 92...ROM. 93...RAM0 Patent applicant Brother Industries, Ltd.

Claims (1)

【特許請求の範囲】[Claims] (1)糸供給源から糸取上体を経て縫針に至る糸道経路
中の糸供給源から糸取上体に至る部分に設けられ、電磁
アクチュエータで駆動される糸係合体により上糸を糸供
給源から繰出して糸取上体の方へ供給する糸繰出し手段
と、各縫目形成毎に少なくとも送り量と針振り量と布厚
に基いて必要な糸量を演算する糸量演算手段と、前記糸
量演算手段で決定された必要糸量を繰出すようにミシン
モータの回転に調時して前記電磁アクチュエータを所定
のタイミングで駆動制御する制御手段とを備えたミシン
において、 前記糸係合体以降の上糸に弛みが生じる新規の縫製作業
の開始を検出する縫製開始検出手段と、前記縫製開始検
出手段により検出される新規の縫製作業の開始から、弛
んだ上糸が縫目形成によって消費されるまでの間、前記
電磁アクチュエータで繰出す糸繰出し量を補正するよう
に前記制御手段に指令する糸量補正手段とを備えたこと
を特徴とするミシンの糸繰出し制御装置。
(1) The upper thread is pulled by a thread engaging body that is provided in the thread path from the thread supply source to the thread take-up body and driven by an electromagnetic actuator in the thread path from the thread supply source to the thread take-up body and then to the sewing needle. a thread payout means for feeding the thread from the supply source to the thread take-up body; and a thread amount calculation means for calculating the necessary thread amount based on at least the feed amount, needle swing amount, and fabric thickness for each stitch formation. and a control means for driving and controlling the electromagnetic actuator at a predetermined timing in synchronization with the rotation of the sewing machine motor so as to feed out the required amount of thread determined by the thread amount calculation means, A sewing start detection means detects the start of a new sewing operation in which the needle thread is loosened after the union, and a sewing start detection means detects the start of a new sewing operation in which the needle thread is loosened after the union, and from the start of the new sewing operation detected by the sewing start detection means, the loosened upper thread is removed by seam formation. A thread feed-out control device for a sewing machine, comprising: thread amount correction means for instructing said control means to correct the amount of thread fed out by said electromagnetic actuator until it is consumed.
JP63037713A 1988-02-18 1988-02-18 Sewing machine thread feeding control device Expired - Fee Related JP2646617B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63037713A JP2646617B2 (en) 1988-02-18 1988-02-18 Sewing machine thread feeding control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63037713A JP2646617B2 (en) 1988-02-18 1988-02-18 Sewing machine thread feeding control device

Publications (2)

Publication Number Publication Date
JPH01212595A true JPH01212595A (en) 1989-08-25
JP2646617B2 JP2646617B2 (en) 1997-08-27

Family

ID=12505157

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63037713A Expired - Fee Related JP2646617B2 (en) 1988-02-18 1988-02-18 Sewing machine thread feeding control device

Country Status (1)

Country Link
JP (1) JP2646617B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993337A (en) * 1989-07-05 1991-02-19 Brother Kogyo Kabushiki Kaisha Sewing machine with automatic thread control and thread breakage detecting devices
CN104131421A (en) * 2014-07-30 2014-11-05 江阴市恒超机电有限公司 Thread clamping device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6131386U (en) * 1984-07-31 1986-02-25 ジューキ株式会社 Needle thread feeding device of sewing machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
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JPS6131386U (en) * 1984-07-31 1986-02-25 ジューキ株式会社 Needle thread feeding device of sewing machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993337A (en) * 1989-07-05 1991-02-19 Brother Kogyo Kabushiki Kaisha Sewing machine with automatic thread control and thread breakage detecting devices
CN104131421A (en) * 2014-07-30 2014-11-05 江阴市恒超机电有限公司 Thread clamping device

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