JPH02213386A - Cloth feed-controlling device for sewing machine - Google Patents

Cloth feed-controlling device for sewing machine

Info

Publication number
JPH02213386A
JPH02213386A JP3420089A JP3420089A JPH02213386A JP H02213386 A JPH02213386 A JP H02213386A JP 3420089 A JP3420089 A JP 3420089A JP 3420089 A JP3420089 A JP 3420089A JP H02213386 A JPH02213386 A JP H02213386A
Authority
JP
Japan
Prior art keywords
thread
feed
sewing machine
needle
speed
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
Application number
JP3420089A
Other languages
Japanese (ja)
Inventor
Masayuki Seki
関 正幸
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 JP3420089A priority Critical patent/JPH02213386A/en
Publication of JPH02213386A publication Critical patent/JPH02213386A/en
Pending legal-status Critical Current

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  • Sewing Machines And Sewing (AREA)

Abstract

PURPOSE:To make it possible to automatically tense thread up in any speed of sewing by providing a timing deciding device by which work cloth feeding is partially done while a needle thread is released by both of contact members after outputs from a speed-detecting device and phase-detecting device for an arm shaft are received, and the faster a rotary speed of the arm shaft is, the earlier the starting timing of the feeding movement of work cloth is made. CONSTITUTION:A timing-deciding device is operated by a speed signal from a speed- detecting device and a phase signal from a phase-detecting device, and work cloth feeding is partially done while a needle thread is released by a pair of contact members. The starting timing of the feeding movement of the work is also so decided that the faster a rotary speed of an arm shaft is, the earlier the starting time of the work cloth feeding is made. A commanding device commands the start of the feeding movement to a feed-controlling device on the basis of its starting timing. The feed-controlling device drives a stepping motor thereby and a feed dog feeds the work according to the feeding movement. As a result of it, the needle thread is fully tightened while restricted and operated together with the feeding movement while released, and is fed to a thread take-up lever from a thread spooling piece, which is necessary for forming the next stitch.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はステッピングモータで直接駆動される送り機構
と上糸の通過を規制する糸通過規制手段とを備えたミシ
ンの布送り制御装置に関し、特に上軸の回転速度に基い
て布送り開始タイミングを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 fabric feed control device for a sewing machine, which is equipped with a feed mechanism directly driven by a stepping motor and a thread passage regulating means for regulating the passage of an upper thread. In particular, the present invention relates to a device in which the cloth feeding start timing is changed based on the rotational speed of the upper shaft.

〔従来技術〕[Prior art]

従来、直線縫いゃジグザグ縫いに加えて、アルファベッ
トや数字などを含む多数の模様纏いが可能となるように
、布送りする送り歯の前後動機構をステッピングモータ
で直接駆動するようにしたミシンが提案されている。
Previously, a sewing machine was proposed in which the forward and backward movement mechanism of the feed dog that feeds the cloth was directly driven by a stepping motor, so that in addition to straight stitches and zigzag stitches, it was possible to stitch many patterns including alphabets and numbers. has been done.

例えば、本願出願人は特開昭62−139694号公報
において、送り歯の上下動機構をミシンモータで駆動し
、送り歯の前後動機構を送り用ステッピングモータで駆
動す番ように構成し、第11図に示すように縫針が最上
位置に達する上軸の0度の回転位相より若干早いタイミ
ングで送り用ステッピングモータを駆動して布送りする
ミシンの布送り装置を提案した。
For example, in Japanese Patent Application Laid-open No. 139694/1983, the applicant of the present application has constructed a structure in which the vertical movement mechanism of the feed dog is driven by a sewing machine motor, and the forward and backward movement mechanism of the feed dog is driven by a feeding stepping motor. As shown in Fig. 11, we have proposed a fabric feeding device for a sewing machine that feeds the fabric by driving a feeding stepping motor at a timing slightly earlier than the 0 degree rotation phase of the upper shaft when the sewing needle reaches its uppermost position.

更に、本願出願人は特開昭63−125285号公報に
おいて、送り歯の代りに複数のローラを送り用ステッピ
ングモータで回転させて布送りするミシンの布送り装置
を提案した。
Furthermore, the applicant of the present application proposed in Japanese Patent Application Laid-open No. 63-125285 a fabric feeding device for a sewing machine in which a plurality of rollers are rotated by a feeding stepping motor instead of feeding teeth to feed the fabric.

更に、上糸の自動糸調子が可能となるように、本願出願
人は例えば特開昭63−105790号公報において、
糸駒から天秤の糸保持部に至る上糸を上軸の回転と調時
して所定のタイミング(第11図参照)で拘束したり解
放したりする1対の係合体及びこれらの接近・離隔を制
御する糸通過制御装置を設けた糸通過制御可能なミシン
を提案した。このミシンの送り歯の前後動機構及び上下
動機構は上軸を介してミシンモータで駆動されるので、
布送り動作は、縫針が最上位置に達する上軸の0度の回
転位相近傍の位相から上糸の解放期間中の略中間の位相
に亙って、上軸の何れの回転速度にも調時して実行され
る。
Furthermore, in order to enable automatic thread tension of the upper thread, the applicant of the present application has disclosed, for example, in Japanese Patent Application Laid-Open No. 63-105790,
A pair of engaging bodies that restrain and release the upper thread from the thread spool to the thread holding part of the thread take-up at a predetermined timing (see Fig. 11) in synchronization with the rotation of the upper shaft, and their approach and separation. We have proposed a sewing machine that is equipped with a thread passage control device that controls thread passage. The forward and backward movement mechanism and vertical movement mechanism of the feed dog of this sewing machine are driven by the sewing machine motor via the upper shaft.
The cloth feeding operation is timed to any rotational speed of the upper shaft from a phase near the 0 degree rotational phase of the upper shaft when the sewing needle reaches the uppermost position to a phase approximately in the middle during the release period of the upper thread. and executed.

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

上糸の自動糸調子が可能で且つ多数の模様縫いが可能な
ミシンを実現するために、前記ミシンの布送り装置と、
糸通過制御装置とを組み合わせた場合、天秤や縫針の上
下動、上糸の拘束や解放のタイミング及び布送りの開始
タイミングは、上軸の何れの回転速度においても上軸の
回転に調時して夫々所定の回転位相で実行される。そし
て、送り用ステッピングモータは一定のパルス周波数の
パルスで駆動される。
In order to realize a sewing machine that is capable of automatic thread tension of the upper thread and that can sew a large number of patterns, a cloth feeding device of the sewing machine,
When combined with a thread passage control device, the vertical movement of the thread take-up and sewing needle, the timing of restraint and release of the needle thread, and the start timing of cloth feeding are synchronized with the rotation of the upper shaft at any rotation speed of the upper shaft. and are executed at predetermined rotational phases. The feeding stepping motor is driven by pulses having a constant pulse frequency.

従って、所定量布送りする場合、第11図に示すように
布送りを終了する時期は上軸の回転速度が大きくなる程
遅くなる。
Therefore, when the cloth is fed by a predetermined amount, as shown in FIG. 11, the timing at which cloth feeding ends becomes slower as the rotational speed of the upper shaft increases.

そのため、上軸の回転速度が中速以上(例えば、約45
Orpm以上)のときには、布送り動作は上糸解放期間
中にその一部が実行されるので、上糸は係合体で拘束さ
れた状態で送り動作及び天秤の上昇動作と連動して十分
に引き締められ、係合体による上糸の解放後に次′の縫
目形成に必要な糸量が糸駒から繰り出されるので糸調子
は良(なる。
Therefore, the rotation speed of the upper shaft is medium speed or higher (for example, about 45
Orpm or above), part of the cloth feeding operation is performed during the upper thread release period, so the upper thread is sufficiently tightened in conjunction with the feeding operation and the raising operation of the thread take-up while being restrained by the engaging body. After the upper thread is released by the engaging body, the amount of thread necessary to form the next stitch is let out from the thread spool, so the thread tension is good.

一方、上軸の回転速度が中速以下のときには、上糸が拘
束された状態で送り動作が終了するので、上糸の引き締
めが強くなり過ぎて、縫目の品質が極端に低下するとい
う問題がある。更に、送り量が少ないときにも、前記同
様に上軸の回転速度に拘らず縫目の品質が低下するとい
う問題がある。
On the other hand, when the rotational speed of the upper shaft is below medium speed, the feeding operation ends with the upper thread being restricted, which causes the upper thread to be tightened too much, resulting in an extremely poor quality of stitches. There is. Furthermore, even when the feed amount is small, there is a problem that the quality of the stitches deteriorates regardless of the rotational speed of the upper shaft, as described above.

前記特開昭63−125285号公報の布送り装置では
、上軸の回転速度が高速のときには低速のときに比べて
布送り開始タイミングを早くするようにしているが、こ
のミシンには糸通過制御装置が設けられてないので、上
糸の拘束や解放のタイミングとの関連で布送り開始タイ
ミングを決定するという思想は存在しない。
In the cloth feeding device disclosed in Japanese Patent Application Laid-Open No. 63-125285, the cloth feeding start timing is made earlier when the rotational speed of the upper shaft is high compared to when the rotational speed is low, but this sewing machine does not have thread passage control. Since no device is provided, there is no concept of determining the cloth feeding start timing in relation to the timing of binding and releasing the upper thread.

本発明の目的は、1対の係合体及び糸通過規制手段とス
テッピングモータで直接駆動する送り機構とを備えたミ
シンの為の布送り制御装置であって、何れの縫製速度に
おいても自動糸調子可能な布送り制御装置を提供するこ
とにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a fabric feed control device for a sewing machine, which is equipped with a pair of engaging bodies, a thread passage regulating means, and a feed mechanism directly driven by a stepping motor. The object of the present invention is to provide a cloth feeding control device that is possible.

〔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布送り制御装置装置は、第1図の
機能ブロック図に示すように、縫針を備えミシンモータ
で上軸を介して上下に往復駆動される針棒と、針棒と調
時してミシンモータで往復駆動される天秤と、糸供給源
から天秤を経て縫針に至る糸道経路のうちの天秤よりも
上流側に設けられ、上糸を拘束する接近位置と拘束しな
い離隔位置とに亙って相対移動可能な1対の係合体と、
上軸に作動的に連結され、係合体を接近位置と離隔位置
とに夫々所定のタイミングで駆動する糸通過規制手段と
、針棒と略調時して送り歯で加工布を移送する送り機構
と、送り機構を駆動する送り用ステッピングモータと、
送り用ステッピングモータを制御する送り制御手段とを
備えたミシンにおいて、上軸の回転速度を検出する速度
検出手段及び上軸の回転位相を検出する位相検出手段と
、速度検出手段と位相検出手段からの出力を受けて、両
係合体による上糸解放期間中に加工布移送の一部が実行
され且つ上軸の回転速度が大きくなる程加工布移送動作
の開始タイミングが早まるようにその開始タイミングを
決定するタイミング決定手段と、タイミング決定手段で
決定された開始タイミングで加工布の移送を開始するよ
うに送り制御手段に指令する指令手段とを備えたもので
ある。
As shown in the functional block diagram of FIG. 1, the cloth feed control device for a sewing machine according to the present invention includes a needle bar that includes a sewing needle and is reciprocated up and down via an upper shaft by a sewing machine motor, and a needle bar that is adjusted by the needle bar. A thread take-up lever is sometimes reciprocated by a sewing machine motor, and is provided upstream of the thread thread path from the thread supply source through the thread take-up to the sewing needle, with an approach position where the needle thread is restrained and a remote position where it is not restrained. a pair of engaging bodies that are movable relative to each other;
A thread passage regulating means that is operatively connected to the upper shaft and drives the engaging body to an approach position and a separation position at predetermined timings, and a feed mechanism that transports the work cloth using a feed dog in approximately synchronization with the needle bar. and a feeding stepping motor that drives the feeding mechanism.
In a sewing machine equipped with a feed control means for controlling a feeding stepping motor, a speed detection means for detecting the rotational speed of the upper shaft, a phase detection means for detecting the rotational phase of the upper shaft, and from the speed detection means and the phase detection means. In response to the output of The apparatus includes timing determining means for determining the timing, and command means for instructing the feed control means to start transferring the work cloth at the start timing determined by the timing determining means.

〔作用〕[Effect]

本発明に係るミシンの布送り制御装置装置の作用につい
て説明する。
The operation of the cloth feed control device for a sewing machine according to the present invention will be explained.

針棒及び天秤は上軸を介してミシンモータで夫々往復駆
動されるとともに、1対の係合体は上軸に作動的に連結
された糸通過規制手段により上糸を拘束する接近位置と
拘束しない離隔位置とに夫々所定のタイミングで駆動さ
れる。
The needle bar and thread take-up are each reciprocated by a sewing machine motor via the upper shaft, and the pair of engaging bodies are placed at an approach position where the needle thread is restrained and at an unrestricted position by a thread passage regulating means operatively connected to the upper shaft. They are driven to separate positions at predetermined timings.

タイミング決定手段は速度検出手段からの速度信号及び
位相検出手段からの位相信号に基いて、加工布移送の一
部が1対の係合体による上糸解放期間中に実行され且つ
上軸の回転速度が大きくなる程早い時期に布送りが開始
されるように、その加工布移送動作の開始タイミングを
決定する。指令手段はその開始タイミングに基いて送り
制御手段に送り動作の開始を指令するので、送り制御手
段が送り用ステッピングモータを駆動し、これに伴い送
/)機構の送り歯は送り量分だけ加工布を移送する。
The timing determining means determines, based on the speed signal from the speed detecting means and the phase signal from the phase detecting means, that part of the workpiece cloth transfer is executed during the upper thread release period by the pair of engaging bodies and the rotational speed of the upper shaft is determined. The start timing of the workpiece cloth transfer operation is determined so that the larger the value, the earlier the cloth feed is started. The command means instructs the feed control means to start the feed operation based on the start timing, so the feed control means drives the feed stepping motor, and accordingly, the feed teeth of the feed/) mechanism are processed by the amount of feed. Transfer the cloth.

その結果、上糸は、上糸拘束期間において送り動作及び
天秤の糸取上動作に連動して十分に引き締められ、上糸
解放期間において送り動作に連動して次の縫目形成に必
要な糸量分糸駒から天秤へ供給される。これにより、上
軸の何れの回転速度においても安定した糸調子となり、
綺麗な縫目が形成される。
As a result, the upper thread is sufficiently tightened in conjunction with the feeding operation and the thread take-up operation of the thread take-up during the upper thread restraint period, and is tightened sufficiently in conjunction with the feeding operation during the upper thread release period to obtain the necessary thread for forming the next stitch. The amount of thread is supplied from the thread spool to the thread take-up. This ensures stable thread tension at any rotational speed of the upper shaft.
A beautiful seam is formed.

〔発明の効果〕〔Effect of the invention〕

本発明に係るミシンの布送り制御装置装置によれば、〔
作用〕の項で説明したように、布送り開始タイミングが
上軸の回転速度の増加に応じて早められ、布送り動作が
上軸の何れの回転速度においても上糸解放前から解放後
に亙って実行されるので、縫製速度に拘わらず安定した
糸調子が得られ、綺麗な縫目を形成することができる。
According to the cloth feed control device for a sewing machine according to the present invention, [
As explained in the section 2.2.2, “Function”, the cloth feed start timing is advanced in accordance with the increase in the rotational speed of the upper shaft, and the cloth feeding operation continues from before the upper thread is released to after the needle thread is released at any rotational speed of the upper shaft. Therefore, stable thread tension can be obtained regardless of the sewing speed, and beautiful stitches can be formed.

〔実施例〕〔Example〕

以下、本発明の実施例にう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.

本実施例は送り用ステッピングモータで送り歯を前後動
させろ布送り機構と上糸の通過を規制する糸通過規制装
置とを備えた電子制御式ジグザグ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 in which the present invention is applied to an electronically controlled zigzag sewing machine that is equipped with a cloth feeding mechanism in which a feed dog is moved back and forth using a feeding stepping motor, and a thread passage regulating device that regulates the passage of upper thread. .

第2図〜第4図に示すように、本縫ミシンMにおいてベ
ツド部2の右端部には脚柱部4が立設され、この脚柱部
4の上端から左方に延びるアーム部6はベツド部2の上
方に対向するように水平に配設され、このアーム部6の
左端部には頭部8が設けられ、この頭部8には針棒10
及び押え棒18が上下方向に夫々配設されている。
As shown in FIGS. 2 to 4, in the lockstitch sewing machine M, a pedestal section 4 is erected at the right end of the bed section 2, and an arm section 6 extending leftward from the upper end of the pedestal section 4 is provided. A head part 8 is provided at the left end of the arm part 6, and a needle bar 10 is provided on the head part 8.
and presser rods 18 are arranged in the vertical direction.

この針棒10の下端には縫針12が取付けられ、針棒1
0は針棒支持体24に上下動自在に装着され、針棒支持
体24の上端部は機枠にピン26を介して枢着されてい
る。これにより、針棒10は針棒支持体24とともにビ
ン26を中心として左右に揺動可能であり、針棒10は
アーム部6内に配設されたミシン主軸28及びミシン主
軸28の端部の針棒クランク30により上下に駆動され
るようになっている。更に、針棒10及び針棒支持体2
4は連杆13とセクタギヤ15及び駆動ギヤ16を介し
て針棒揺動用ステッピングモータ17により左右方向に
揺動駆動される。
A sewing needle 12 is attached to the lower end of this needle bar 10.
0 is attached to a needle bar support 24 so as to be vertically movable, and the upper end of the needle bar support 24 is pivotally attached to the machine frame via a pin 26. As a result, the needle bar 10 is able to swing left and right about the pin 26 together with the needle bar support 24, and the needle bar 10 is attached to the sewing machine main shaft 28 disposed within the arm portion 6 and the end of the sewing machine main shaft 28. It is designed to be driven up and down by a needle bar crank 30. Further, a needle bar 10 and a needle bar support 2
4 is driven to swing in the left-right direction by a stepping motor 17 for swinging the needle bar via a connecting rod 13, a sector gear 15, and a drive gear 16.

前記押え棒18の下端部には押え足2oが着脱可能に取
付けられ、この押え棒18は操作体21(第3図参照)
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
される。
A presser foot 2o is removably attached to the lower end of the presser bar 18, and this presser bar 18 is connected to an operating body 21 (see FIG. 3).
The position is switched between the raised position and the lowered position by the operation of .

次に天秤機構について第2図〜第4図により説明する。Next, the balance mechanism will be explained with reference to FIGS. 2 to 4.

前記ミシン主軸28はブツシュメタル32などを介して
機枠に回転自在に装着され、この主軸28の斜め上の後
方には副軸34が主軸28と平行に配設され、この副軸
34は機枠に回動自在に装着されている。この副軸34
に揺動レバー36の一端部が回動自在に連結され、この
揺動レバー36は副軸34から主軸28に固着された天
秤クランク3日の左端面側へ延び、天秤クランク38の
クランクビン40は揺動レバー36の細長いカム孔42
を挿通して延び、1g動動式バー36左側においてクラ
ンクビン40の左端部には連結板44が固着され、この
連結板44から左方へ延びる枢支ビン46には針棒クラ
ンク30が回動自在に連結され、針棒クランク30の下
端部が針棒10の中段部に連結されている。
The main shaft 28 of the sewing machine is rotatably attached to the machine frame via a bushing metal 32, etc., and a sub-shaft 34 is disposed diagonally above and behind the main shaft 28 in parallel with the main shaft 28, and this sub-shaft 34 is attached to the machine frame. It is rotatably attached to. This secondary shaft 34
One end of a swinging lever 36 is rotatably connected to the swinging lever 36, and the swinging lever 36 extends from the subshaft 34 to the left end surface of the balance crank fixed to the main shaft 28, and is connected to the crank bin 40 of the balance crank 38. is the elongated cam hole 42 of the swing lever 36.
A connecting plate 44 is fixed to the left end of the crank pin 40 on the left side of the 1g movable bar 36, and the needle bar crank 30 is rotated to a pivot pin 46 extending leftward from the connecting plate 44. The lower end portion of the needle bar crank 30 is connected to the middle portion of the needle bar 10.

揺動レバー36の前部の上端部には、クランク状に上方
へ延びる天秤48が一体的に形成され、この天秤48の
上端部には糸保持部48aが形成されている。
A crank-shaped lever 48 extending upward is integrally formed at the upper end of the front portion of the swing lever 36, and a thread holding portion 48a is formed at the upper end of the lever 48.

前記揺動レバー36のカム孔42は、第2図・第3図に
示すようにクランクビン40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ビン40が約74°回転す
るのを許す円弧孔42aとその円弧孔42aの両端部か
ら真直ぐに延びる短かい直孔42bとから形成され、こ
のカム孔42の外周部は補強部36aで補強されている
The cam hole 42 of the swing lever 36 allows the crank bin 40, which is located near the uppermost position and has the same radius as the rotation locus of the crank bin 40, to rotate approximately 74 degrees as shown in FIGS. 2 and 3. It is formed of an arcuate hole 42a and a short straight hole 42b extending straight from both ends of the arcuate hole 42a, and the outer periphery of this cam hole 42 is reinforced with a reinforcing portion 36a.

前記揺動レバー36のカム孔42にクランクビン40が
挿通した状態で天秤クランク38及びクランクピン40
が主軸28回りに回転すると、揺動レバー36は副軸3
4を揺動中心としてクランクピン40によって第3図に
実線で図示の最上位置(最大系取上量W)と仮想線で図
示の最下位置(最大系弛緩位置)とに亙って上下に往復
揺動駆動される。このとき、ミシン主軸28の回転運動
に同期して針棒クランク30とクランクピン40を介し
て針棒10が上下に往復駆動されることになる。
With the crank pin 40 inserted into the cam hole 42 of the swing lever 36, the balance crank 38 and the crank pin 40 are inserted.
rotates around the main shaft 28, the swing lever 36 rotates around the sub shaft 3.
4 as the center of rotation, the crank pin 40 moves up and down between the highest position (maximum system take-up amount W) shown by the solid line in FIG. 3 and the lowest position (maximum system relaxation position) shown by the imaginary line in FIG. Driven to reciprocate and swing. At this time, the needle bar 10 is reciprocated up and down via the needle bar crank 30 and crank pin 40 in synchronization with the rotational movement of the sewing machine main shaft 28.

前記揺動レバー36のカム孔42の一部に前述のような
円弧孔42aが形成されているので、主軸28の回転位
相角をパラメータとする天秤48の運動は第7図の曲線
MAのようになり、針棒10の下端に取付けられた縫針
12の運動は第7図の曲線MBのようになる。
Since the circular arc hole 42a as described above is formed in a part of the cam hole 42 of the swing lever 36, the movement of the balance 48 using the rotational phase angle of the main shaft 28 as a parameter is as shown by the curve MA in FIG. The movement of the sewing needle 12 attached to the lower end of the needle bar 10 is as shown by the curve MB in FIG.

天秤48は、ミシン主軸28の位相が約40度の時から
縫針12の目孔が針板22の上面に達する時まで最上位
置に保持される。従って、布送り動作の略後半の期間に
おいて天秤48が最上位置に保持されて、上糸14は天
秤48によって最大系取上量が確保される。
The thread take-up 48 is held at the uppermost position from when the sewing machine main shaft 28 is in phase approximately 40 degrees until the eye of the sewing needle 12 reaches the upper surface of the throat plate 22. Therefore, during approximately the latter half of the cloth feeding operation, the thread take-up 48 is held at the uppermost position, and the thread take-up 48 ensures the maximum amount of needle thread 14 taken up.

次に、送り歯23を上γ動及び前後動させる布送り機構
41について、第2図に基いて説明する。
Next, the cloth feeding mechanism 41 for moving the feeding dog 23 upwardly and longitudinally will be explained based on FIG. 2.

押え足20の下方のベツド部2には前後方向向きに送り
台43が配設され、この送り台43は送り歯23を載置
支持するとともに、その前端の二股部は上下送り腕45
上の軸部と嵌合し、その上下送り腕45は上下送り軸4
7に固着されている。
A feed stand 43 is disposed in the bed portion 2 below the presser foot 20 in the front-rear direction, and this feed stand 43 supports the feed dog 23, and the bifurcated portion at the front end of the feed stand 43 supports the upper and lower feed arms 45.
The vertical feed arm 45 is fitted with the upper shaft portion, and the vertical feed arm 45 is connected to the vertical feed shaft 4.
It is fixed to 7.

その上下送り軸47の二股部に嵌合するカム49は揺動
体51に固着され、この揺動体51とミシン主軸28の
クランク部28aとはクランクロッド53を介して連結
されている。
A cam 49 that fits into the bifurcated portion of the vertical feed shaft 47 is fixed to a swinging body 51, and the swinging body 51 and the crank portion 28a of the main shaft 28 of the sewing machine are connected via a crank rod 53.

一方、送り台43の後端部は、水平送り軸55に突設さ
れた1対の腕部に回動可能に支持され、水平送り軸55
はそれ自身の軸回りに揺動し得るように機枠に支持され
ている。この水平送り軸55の右端部にはセクタギヤ5
7が固着され、そのギヤ部は送り用ステッピングモータ
59の出力軸に固着された駆動ギヤ61と噛み合ってい
る。従って、ミシン主軸28の回転によりクランクロッ
ド53を介して揺動体51が揺動回転するのに伴ってカ
ム49、上下送り軸47及び上下送り腕45を介して送
り歯23が上下駆動される。この送り歯の上下動と同期
して送り用ステッピングモータ59が駆動されるので、
送り歯23はその上昇位置及び下降位置のときに前後動
される。
On the other hand, the rear end of the feed table 43 is rotatably supported by a pair of arms protruding from the horizontal feed shaft 55.
is supported on the machine frame so that it can swing about its own axis. A sector gear 5 is attached to the right end of this horizontal feed shaft 55.
7 is fixed, and its gear portion meshes with a drive gear 61 fixed to the output shaft of the stepping motor 59 for feeding. Therefore, as the swinging body 51 swings and rotates via the crank rod 53 due to the rotation of the sewing machine main shaft 28, the feed dog 23 is vertically driven via the cam 49, the vertical feed shaft 47, and the vertical feed arm 45. Since the feeding stepping motor 59 is driven in synchronization with the vertical movement of the feed dog,
The feed dog 23 is moved back and forth in its raised and lowered positions.

次に、上糸I4を拘束及び解放する1対の係合体及び糸
通過規制装置について第2図〜第6図により説明する。
Next, a pair of engaging bodies and a thread passage regulating device for restraining and releasing the needle thread I4 will be explained with reference to FIGS. 2 to 6.

前記主軸28の左端の針棒クランク30の直ぐ左側には
機枠の一部である板部材50が主軸28と直交状に設け
られている。第2図・第3図に示すように主軸28より
も少し前方の位置で、板部材50の左側部には上糸14
に通過抵抗を与え得るブリテンション装置52が必要に
応じて設けられる。
Immediately to the left of the needle bar crank 30 at the left end of the main shaft 28, a plate member 50, which is a part of the machine frame, is provided perpendicularly to the main shaft 28. As shown in FIGS. 2 and 3, a needle thread 14 is attached to the left side of the plate member 50 at a position slightly forward of the main shaft 28.
A britension device 52 that can provide passage resistance is provided as necessary.

このブリテンション装置52は1対の糸調子皿52aの
間に上糸を通過させ、ダイヤルを回動操作することによ
りスプリング力を調整して糸通過抵抗を調節し得るよう
にしたものであり、このブリテンション装置52は省略
してもよい。
This britension device 52 allows the upper thread to pass between a pair of thread tension discs 52a, and by rotating a dial, the spring force can be adjusted to adjust the thread passing resistance. This britension device 52 may be omitted.

更に、糸駒(図示略)から天秤48の糸保持部48aを
経て縫針12の目孔に至る上糸供給路のうち、糸駒から
天秤48の糸保持部48aに至る上糸14を主軸28の
運動と調時して拘束したり解放したりすることが出来る
ように、1対の係合体としての糸道規制板56と可動輪
64を有する可動板58及びこれらを接近位置と離隔位
置とに夫々所定のタイミングで駆動する糸通過規制装置
54が次のように設けられている。
Furthermore, the needle thread 14 from the thread spool to the thread holding portion 48a of the thread take-up lever 48 is connected to the main shaft 28 in the needle thread supply path from the thread spool (not shown) to the thread holding portion 48a of the thread take-up lever 48 to the eye hole of the sewing needle 12. In order to be able to restrain and release in synchronization with the movement of Yarn passage regulating devices 54, which are driven at predetermined timings, are provided in the following manner.

前記ブリテンション装置52の下方位置において板部材
50の左側に糸道規制板56(保合体)が固着され、こ
の糸道規制板56の左側面の近傍に配設された可動板5
8とリンクアーム60の下端部とが段付ネジ62で板部
材50に回動自在に枢着され、可動板58の可動輪64
(保合体)が糸道規制板56の規制部56aに下方より
当接して規制部56aと可動輪64との間に上糸14を
挟持拘束し得るように配設され、可動板58はその可動
輪64が規制部56aへ押圧されるように一端が機枠に
固定された引っ張りバネ66で弾性付勢され、可動板5
日の腕部58aの上端の接触軸68がリンクアーム60
の下端近くの接触部60aに前方より接触している。
A yarn path regulating plate 56 (holding body) is fixed to the left side of the plate member 50 at a position below the britension device 52, and a movable plate 5 is disposed near the left side of the yarn path regulating plate 56.
8 and the lower end of the link arm 60 are rotatably connected to the plate member 50 with stepped screws 62, and the movable ring 64 of the movable plate 58
(holding body) is arranged so as to be able to abut the regulating part 56a of the thread path regulating plate 56 from below and clamp and restrain the upper thread 14 between the regulating part 56a and the movable ring 64, and the movable plate 58 The movable ring 64 is elastically biased by a tension spring 66 whose one end is fixed to the machine frame so that the movable ring 64 is pressed against the regulating portion 56a, and the movable plate 5
The contact shaft 68 at the upper end of the arm portion 58a is connected to the link arm 60.
The contact portion 60a near the lower end of is contacted from the front.

第2図・第3図・第6図に示すように、可動輪64の周
面には環状のV溝64aが形成され、糸道規制板56の
規制部56aは可動輪64の上半部の■溝64a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56aは断面U形の突曲面状に形成されている
As shown in FIG. 2, FIG. 3, and FIG. The restricting portion 56a is formed in an inverted U shape when viewed from the side so as to be engaged with the groove 64a from above, and the restricting portion 56a is formed in a convexly curved surface having a U-shaped cross section.

前記ブリテンション装置52を通過して来た上糸14は
糸道規制板56の規制部56aでU字状に屈曲して天秤
48の糸保持部48aを経由して縫針12へ延びている
The needle thread 14 that has passed through the britension device 52 is bent into a U-shape at the regulating portion 56a of the thread path regulating plate 56, and extends to the sewing needle 12 via the thread holding portion 48a of the thread take-up lever 48.

そして、前記規制部56aで屈曲する上糸14は規制部
56aと■溝64aとの間に2点で挟持され強力に拘束
されることになる。特に、規制部56aで屈曲する上糸
14の糸供給路を含む面に対して平行な方向へ可動輪6
4が駆動され、上糸14を横断的に挟持拘束するので、
上糸14を挟持する面圧が非常に大きくなる。つまり可
動輪64を押圧する力が小さい場合でも上糸14を強力
に拘束できることになる。
The needle thread 14 bent by the regulating part 56a is held between the regulating part 56a and the groove 64a at two points and is strongly restrained. In particular, the movable ring 6 moves in a direction parallel to the plane including the thread supply path of the needle thread 14 bent at the regulating portion 56a.
4 is driven and clamps and restrains the upper thread 14 in a transverse manner.
The surface pressure that clamps the needle thread 14 becomes extremely large. In other words, even when the force pressing the movable ring 64 is small, the needle thread 14 can be strongly restrained.

そして、主軸28の回転に調時して可動板58の可動輪
64をミシン主軸28の回転に調時して上下に駆動し上
糸I4の解放と拘束とを所定のタイミングで実行させる
ため、第2図・第4図〜第5図に示すように副軸34の
右端側部分に対応する位置において主軸28には楕円状
のカム溝72を有する回転カム70が固着され、副軸3
4に固着された第1アーム74の先端の接触子74aが
カム溝72に係合している。
Then, the movable ring 64 of the movable plate 58 is driven up and down in synchronization with the rotation of the main shaft 28 of the sewing machine to release and restrain the upper thread I4 at a predetermined timing. As shown in FIGS. 2 and 4 to 5, a rotating cam 70 having an elliptical cam groove 72 is fixed to the main shaft 28 at a position corresponding to the right end side of the subshaft 34, and
A contact 74 a at the tip of the first arm 74 fixed to the cam groove 72 is engaged with the cam groove 72 .

一方、副軸34の左端部には第2アーム76が固着され
、第2アーム76の下端部はリンクアーム60の上端部
のルーズビン穴60bにピン76aを嵌めることにより
連結されている。
On the other hand, a second arm 76 is fixed to the left end of the subshaft 34, and the lower end of the second arm 76 is connected by fitting a pin 76a into a loose bottle hole 60b at the upper end of the link arm 60.

以上の1対の係合体56・64及び糸通過規制装置にお
いて、主軸28とともに回転カム70が回転し楕円状の
カム溝72を介して第1アーム74が揺動すると、副軸
34を介して第2アーム76が揺動し、第2アーム76
が揺動するとリンクアーム60が段付ネジ62を中心と
して揺動する。
In the pair of engaging bodies 56 and 64 and the thread passage regulating device described above, when the rotating cam 70 rotates together with the main shaft 28 and the first arm 74 swings through the elliptical cam groove 72, the first arm 74 swings through the elliptical cam groove 72. The second arm 76 swings, and the second arm 76
When the link arm 60 swings, the link arm 60 swings around the stepped screw 62.

その結果、リンクアーム60の接触部60aで接触軸6
8が前方へ押動されると、可動板58がバネ力に抗して
回動し、可動輪64が糸道規制板56の規制部56aか
ら離れ、上糸14が拘束状態から解放される。また、リ
ンクアーム60の接触部60aが後方へ移動すると、可
動板58はバネ66の弾性力で回動し可動輪64が規制
部56aに当接し、上糸14が規制部56aと可動輪6
4の間に挟持拘束される。このように、上糸14の解放
と拘束とが夫々所定のタイミングで実行されることにな
る。この上糸14を解放したり拘束したりするタイミン
グは第7図の曲線MCに示しである。
As a result, the contact shaft 6 at the contact portion 60a of the link arm 60
8 is pushed forward, the movable plate 58 rotates against the spring force, the movable ring 64 separates from the regulating portion 56a of the thread path regulating plate 56, and the upper thread 14 is released from the restrained state. . Further, when the contact portion 60a of the link arm 60 moves rearward, the movable plate 58 is rotated by the elastic force of the spring 66, the movable ring 64 comes into contact with the restriction portion 56a, and the upper thread 14 is moved between the restriction portion 56a and the movable ring 66.
4 and is held between the two. In this way, the upper thread 14 is released and restrained at predetermined timings. The timing at which the upper thread 14 is released or restrained is shown by a curve MC in FIG.

第7図から判るように、天秤48が最下位置から最上位
置まで上昇していく上糸14の引き締め時には、糸道規
制板56と可動輪64により上糸14が拘束されている
ので上糸14の引き締めが確実に実行される。天秤48
が最上位置に達し上糸14の引き締めが完了したときに
は布送りと連動して上糸14を供給するため糸道規制板
56と可動輪64による拘束が解放され、必要量の上糸
14が糸駒から天秤48の方へ供給される。このように
上糸14の拘束を解放した状態で布送り及び針振りが完
了し、縫針12が針板22に達する時期までには上糸1
4が再び拘束され、上糸14を拘束した状態で縫動作が
実行されて上糸輪が下糸ボビン側に形成される。従って
、布送りと針振りのために消費される必要量の上糸14
は確実に供給され、上糸輪の形成時には上糸14が拘束
されているので不要な上糸14は供給されない。
As can be seen from FIG. 7, when the needle thread 14 is tightened as the thread take-up lever 48 rises from the lowest position to the highest position, the needle thread 14 is restrained by the thread path regulating plate 56 and the movable ring 64, so the needle thread is tightened. 14 tightening is performed reliably. balance 48
When the needle thread 14 reaches the uppermost position and tightening of the needle thread 14 is completed, the needle thread 14 is supplied in conjunction with the cloth feed, so that the restriction by the thread path regulating plate 56 and the movable ring 64 is released, and the required amount of needle thread 14 is delivered to the thread. The piece is supplied to the balance 48. In this way, cloth feeding and needle swinging are completed with the upper thread 14 released, and by the time the sewing needle 12 reaches the throat plate 22, the upper thread 1
4 is restrained again, the sewing operation is performed with the needle thread 14 restrained, and a needle thread loop is formed on the bobbin thread bobbin side. Therefore, the required amount of needle thread 14 consumed for cloth feeding and needle swinging is
is reliably fed, and since the needle thread 14 is restrained when forming the needle thread loop, unnecessary needle thread 14 is not fed.

次に、検出器等について説明すると、前記ミシン主軸2
8はタイミングベルト63及びプーリ65を介してミシ
ンモータ67で回転駆動される。
Next, to explain the detector etc., the sewing machine main shaft 2
8 is rotationally driven by a sewing machine motor 67 via a timing belt 63 and a pulley 65.

このミシン主軸28には多数のスリットを所定間隔毎に
放射状に形成したディスクが固着され、このディスクと
これらのスリットを検出して速度信号(パルス信号)を
出力するフォトインクラブタからなる速度検出器69が
設けられている。更に、ミシン主軸28には1つのスリ
ットを形成したディスクが固着され、このディスクとミ
シン主軸28の回転位相が約330度のときにこのスリ
ットを・検出して布送り基準信号(パルス信号)を出力
するフォトインクラブタからなる布送り基準信号発生器
71が設けられている。
A disk in which a large number of slits are formed radially at predetermined intervals is fixed to the main shaft 28 of the sewing machine, and a speed detection device is composed of this disk and a photo ink club that detects these slits and outputs a speed signal (pulse signal). A container 69 is provided. Furthermore, a disk with one slit is fixed to the sewing machine main shaft 28, and when the rotational phase between this disk and the sewing machine main shaft 28 is approximately 330 degrees, this slit is detected and a cloth feed reference signal (pulse signal) is generated. A cloth feed reference signal generator 71 consisting of a photo ink printer for outputting is provided.

次に、ミシンMの制御系の全体構成について、第8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. 8.

制御装置Cの入出力インターフェイス90には入力信号
として次のようなスイッチやボリュームなどが接続され
ている。
The following switches, volume, etc. are connected to the input/output interface 90 of the control device C as input signals.

所望の模様を選択する模様選択スイッチ77、起動停止
ボタンに連結され起動信号及び停止信号を出力する起動
・停止スイッチ78、速度信号を出力する速度検出器6
9、送り量調節ツマミに連結され送り量l11信号を出
力する送り量調節ボリューム79及びその信号をA/D
変換するA/D変換器80、針揺動量調節ツマミに連結
され針揺動量調節信号を出力する針揺動量調節ボリュー
ム81及びその信号をA/D変換するA/D変換器82
、スピード調節ツマミに連結され設定速度信号を出力す
るスピードボリューム83及びその信号をA/D変換す
るA/D変換器84、約IKIIZのクロックパルスを
発生するクロックパルス発生器85、布送り基準信号を
出力する布送り基準信号発生器71、ミシン主軸28に
取付けられたディスクとフォトインクラブタからなりミ
シン主軸28の回転に調時して所定のタイミング毎に針
揺動タイミング信号(パルス信号)を出力する針揺動タ
イミング信号発生器86.更に、ミシンモータ67は駆
動回路87を介して、送り用ステッピングモータ59は
駆動回路88を介して、針棒揺動用ステッピングモータ
17は駆動回路89を介して夫々入出力インターフェイ
ス90に接続されている。
A pattern selection switch 77 that selects a desired pattern, a start/stop switch 78 that is connected to a start/stop button and outputs a start signal and a stop signal, and a speed detector 6 that outputs a speed signal.
9. Feed amount adjustment volume 79 connected to the feed amount adjustment knob and outputs the feed amount l11 signal, and the A/D that outputs the feed amount l11 signal.
An A/D converter 80 for converting, a needle swing amount adjustment volume 81 connected to a needle swing amount adjustment knob and outputting a needle swing amount adjustment signal, and an A/D converter 82 for A/D converting the signal.
, a speed volume 83 connected to the speed adjustment knob and outputting a set speed signal, an A/D converter 84 converting the signal into A/D, a clock pulse generator 85 generating clock pulses of approximately IKIIZ, and a cloth feed reference signal. The fabric feed reference signal generator 71 outputs a needle swing timing signal (pulse signal) at a predetermined timing in synchronization with the rotation of the sewing machine main shaft 28. A needle swing timing signal generator 86. Further, the sewing machine motor 67 is connected to the input/output interface 90 via a drive circuit 87, the feeding stepping motor 59 via a drive circuit 88, and the needle bar swinging stepping motor 17 via a drive circuit 89. .

制御装置CはCPU (中央演算装置)92と、そのC
PU92にデータバスなどのバス91を介して接続され
た入出力インターフェイス90、ROM93及びRAM
94とから構成されている。
The control device C includes a CPU (central processing unit) 92 and its C
An input/output interface 90, ROM 93, and RAM connected to the PU 92 via a bus 91 such as a data bus.
It consists of 94.

ROM93には、次のようなデータやプログラムが予め
格納されている。
The following data and programs are stored in the ROM 93 in advance.

(1)文字や記号やマークなどの多数の模様の夫々につ
い゛て各縫い動作毎の針位置データを模様番号と対応さ
せて記憶した模様データ (2)  スピードボリューム83から出力される設定
速度信号と起動・停止スイッチ78から出力される起動
信号及び停止信号に基いてミシンモータ67の駆動を制
御する制御プログラム (3)選択された模様データに基いて針揺動タイミング
のときに針棒揺動用ステッピングモータ17を制御し、
送り開始信号を受けたときに送り用ステッピングモータ
59を制御する制御プログラム″C4)布送り動作の開
始タイミングを模様データ及び速度信号に基いて決定す
る送り動作開始制可の制御プログラム 前記送り動作開始制御プログラムには、次のようなデー
タやサブルーチンが予め格納されている。
(1) Pattern data in which needle position data for each sewing operation is stored in association with the pattern number for each of a large number of patterns such as letters, symbols, marks, etc. (2) Set speed signal output from speed volume 83 (3) A control program for controlling the drive of the sewing machine motor 67 based on the start signal and stop signal output from the start/stop switch 78. controlling the stepping motor 17;
Control program for controlling the feeding stepping motor 59 when receiving a feed start signal ``C4) Control program for controlling the start of the feed operation that determines the start timing of the cloth feed operation based on the pattern data and the speed signal ``Start of the feed operation'' The following data and subroutines are stored in advance in the control program.

(i)  入力された速度信号のパルス数に基いてミシ
ン主軸28の回転速度Vを求める演算サブルーチン (ii)  布送り基準信号入力の時点から布送り開始
タイミングまでのクロックパルスのパルス数を、S=C
/V−A、xVの演算式で求めて布送り開始タイミング
を決定するサブルーチン。但し、Cは所定の定数、■は
ミシン主軸28の回転速度(rpm)、係数A、はO〜
0.51!II!l、 0.6〜1.0 mm、・・・
・・ 5.6〜6.Otrrtaの各布送り量に対して
送り量が大きくなる程A、が大きくなるように予め設定
されテーブルとして格納されている。
(i) Calculation subroutine that calculates the rotational speed V of the sewing machine main shaft 28 based on the number of pulses of the input speed signal. (ii) The number of clock pulses from the time when the cloth feed reference signal is input to the cloth feed start timing is calculated by S. =C
A subroutine that determines the cloth feeding start timing by calculating it using the arithmetic expressions /VA and xV. However, C is a predetermined constant, ■ is the rotation speed (rpm) of the sewing machine main shaft 28, and coefficient A is O~
0.51! II! l, 0.6-1.0 mm,...
・・・5.6~6. For each cloth feed amount of Otrrta, it is set in advance so that A increases as the feed amount increases and is stored as a table.

RAM94には、クロックパルス発生器85から入力さ
れるクロックパルスを計数するパルスカウンタ95とC
PU92で演算処理した結果を一時的に記憶する各種の
メモリとが設けられている。
The RAM 94 includes a pulse counter 95 that counts clock pulses input from the clock pulse generator 85 and a pulse counter 95 that counts clock pulses input from the clock pulse generator 85.
Various types of memories are provided to temporarily store the results of calculations performed by the PU 92.

次に、ミシンMの制御装置Cで行なわれる送り動作開始
制御のルーチンについて、第9図のフローチャートに基
いて説明する。尚、図中Si (i=1.2.3・・・
)は各ステップである。
Next, the feed operation start control routine performed by the control device C of the sewing machine M will be explained based on the flowchart of FIG. In the figure, Si (i=1.2.3...
) is each step.

起動・停止スイッチ78が操作されて起動信号が入力さ
れるとこの制御が開始され、初期設定が実行される(S
l)。これと同時に起動信号によりROM93の前記(
2)のプログラムに基いてミシンモータ67が駆動され
てミシン主軸2日が回転し、CPU92が布送り基準信
号を検出したか否かが判定される(S2)。第7図に示
すようにミシン主軸28の回転位相が約330度のとき
に布送り基準信号発生器71から布送り基準信号が入力
されたときに32でYesと判定され、パルスカウンタ
95のカウント値■がクリアされる(S3)。
When the start/stop switch 78 is operated and a start signal is input, this control is started and initial settings are executed (S
l). At the same time, the activation signal causes the above (
Based on the program 2), the sewing machine motor 67 is driven to rotate the sewing machine main shaft 2, and it is determined whether the CPU 92 has detected the cloth feed reference signal (S2). As shown in FIG. 7, when the rotational phase of the main shaft 28 of the sewing machine is approximately 330 degrees, when the cloth feed reference signal is input from the cloth feed reference signal generator 71, it is determined as Yes at 32, and the pulse counter 95 counts. The value ■ is cleared (S3).

次に速度検出器69から入力される速度信号(パルス信
号)が所定時間の間読込まれ(S4)、前記ROM 9
3の(i)のプログラムに基いてミシン主軸28の回転
速度■が演算により求められる(S5)。次に送り量調
節ボリューム79からの送り!調節信号及び模様選択ス
イッチ77で選択された模様データの送り量データに基
いて次回の送り量データが読込まれる(S6)、次にミ
シン主軸28の回転速度Vと送り量データとを用いて前
記演算式により布送り開始タイミング用パルス数S(ク
ロックパルス数)が求められる(S7)。
Next, the speed signal (pulse signal) input from the speed detector 69 is read for a predetermined time (S4), and the ROM 9
The rotational speed (2) of the main shaft 28 of the sewing machine is calculated based on the program in 3(i) (S5). Next, feed from the feed amount adjustment volume 79! The next feed amount data is read based on the adjustment signal and the feed amount data of the pattern data selected by the pattern selection switch 77 (S6), and then the rotation speed V of the sewing machine main shaft 28 and the feed amount data are read. The number of pulses S (number of clock pulses) for cloth feeding start timing is determined by the above calculation formula (S7).

次にパルスカウンタ9ぢのカウント値!としてこのパル
ス数Sが格納され(S8)、クロックパルス発生器85
からクロックパルスが入力される毎に(39)、パルス
カウンタ95のカウント値1が1つデクリメントされ(
310)、このカウント値■が「0」でないときには(
Sll)、39〜S11が繰り返えされる。そして、カ
ウント値Iが「0」になったときつまり回転速度■と送
り量とに基いた布送り動作の開始タイミングのときには
SitでYesと判定され、送り量データに基いて送り
用ステッピングモータ59が駆動され(S12)、32
に戻る。
Next is the count value of pulse counter 9! This pulse number S is stored as (S8), and the clock pulse generator 85
Every time a clock pulse is input from (39), the count value 1 of the pulse counter 95 is decremented by one (
310), and when this count value ■ is not "0", (
Sll), 39 to S11 are repeated. Then, when the count value I becomes "0", that is, at the timing to start the cloth feeding operation based on the rotational speed ■ and the feed amount, it is determined as Yes in Sit, and the feeding stepping motor 59 is determined based on the feed amount data. is driven (S12), 32
Return to

その結果、送り量及びミシン主軸28の回転速度が大き
い程布送りの開始タイミングが早くなる。
As a result, the larger the feed amount and the rotational speed of the main shaft 28 of the sewing machine, the earlier the cloth feeding start timing becomes.

送り量一定の場合について説明すると、第7図に示すよ
うに縫製速度が大きくなる程布送りが早いタイミングで
開始される。更に、第10図に示すようにミシン主軸2
8の回転速度が一定(例えば約400rpm)の場合に
ついて説明すると、送り量が大きくなる程布送り開始タ
イミングは早くなる。即ち、何れの布送り動作において
もその前半部分では上糸14が糸道規制板56と可動輪
64とにより拘束されているので、送り歯23による送
り動作及び天秤48の上昇動作に連動して上糸14は十
分に引き締められ、上糸14の拘束が解放された解放期
間において布送り動作の後半部分が実行されるので、上
糸14は送り動作に連動して次の縫目形成に必要な糸量
付糸駒から天秤48へ供給される。従って、何れの縫製
速度及び送り量においても安定した糸調子が得られ、綺
麗な縫目を形成することができる。
To explain the case where the feed amount is constant, as shown in FIG. 7, as the sewing speed increases, the cloth feed starts at an earlier timing. Furthermore, as shown in Fig. 10, the sewing machine main shaft 2
To explain the case where the rotational speed of No. 8 is constant (for example, about 400 rpm), the cloth feeding start timing becomes earlier as the feed amount becomes larger. That is, in the first half of any cloth feeding operation, the upper thread 14 is restrained by the thread path regulating plate 56 and the movable ring 64, so that the upper thread 14 is interlocked with the feeding operation by the feed dog 23 and the lifting operation of the thread take-up lever 48. The needle thread 14 is sufficiently tightened and the second half of the cloth feeding operation is executed during the release period in which the needle thread 14 is released from the constraint, so the needle thread 14 is necessary for forming the next stitch in conjunction with the feeding operation. The yarn is supplied to the thread take-up 48 from a thread spool with a certain amount of thread. Therefore, stable thread tension can be obtained at any sewing speed and feed amount, and beautiful stitches can be formed.

尚、前記送り動作開始制御プログラムにおいて、布送り
開始タイミング用パルスSは、送り量とミシン主軸28
の回転速度■をパラメータとするマツプとして格納して
おいてもよい。
In the feed operation start control program, the cloth feed start timing pulse S is based on the feed amount and the sewing machine main shaft 28.
It may also be stored as a map with the rotation speed ■ as a parameter.

尚、布送り基準信号発生器71を330度の回転位相の
ときから複数のパルス信号を出力するように構成し、送
り動作開始制御の89〜Sllにおいてこのパルス信号
をカウントするようにしてもよい。
Note that the cloth feed reference signal generator 71 may be configured to output a plurality of pulse signals from the rotation phase of 330 degrees, and these pulse signals may be counted at 89 to Sll of the feed operation start control. .

尚、本発明は1対の係合体をソレノイドなどの電気アク
チュエータで駆動するように構成した場合にも同様に適
用し得ることは勿論である。
It goes without saying that the present invention can be similarly applied to a case where the pair of engaging bodies is configured to be driven by an electric actuator such as a solenoid.

また、本発明のミシンにおいては、糸通過規制装置54
が上糸14を解放している間、天秤48を最上位置に保
持して最大系取上量を確保するようにしているが、特開
昭63−296785号公報、特開昭63−29678
6号公報及び特開昭63−296787号公報等に記載
された機構等を用いることによって上糸14の解放中に
最大系取上量を確保するようにしてもよい。
Further, in the sewing machine of the present invention, the thread passage regulating device 54
While releasing the needle thread 14, the thread take-up 48 is held at the uppermost position to ensure the maximum system take-up amount.
The maximum system take-up amount may be ensured while the upper thread 14 is being released by using the mechanisms described in Japanese Patent Application No. 63-296787 and the like.

更に、本発明のミシンにおいては、主軸28の速度を速
度検出器69によって直接検出するように構成されてい
るが、スピードボリューム83の発生する設定速度信号
によってミシン主軸2日の速度を間接的に検出するよう
にしてもよい。
Furthermore, although the sewing machine of the present invention is configured to directly detect the speed of the main shaft 28 by the speed detector 69, the speed of the sewing machine main shaft 28 can be indirectly detected by the set speed signal generated by the speed volume 83. It may also be detected.

【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10図は本発明の実施例を示すもので、第2図はミシ
ンの内部機構を示す斜視図、第3図は前記内部機構の側
面図、第4図は前記内部機構の正面図、第5図は第4図
V−V線断面図、第6図は第3図Vl−Vl線断面図、
第7図は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、第9図は送り動
作開始制御のルーチンの概略フローチャート、第10図
はミシン主軸の特定回転速度における各種の布送り量に
基く布送り開始タイミングを説明する線図、第11図は
従来技術に係り布送り動作と上糸解放期間との関係を説
明する線図である。 M・・ミシン、 10・・針棒、 12・・縫針、14
・・上糸、 28・・ミシン主軸、34・・副軸、 3
6・・揺動レバー 43・・送り台、 47・・上下送り軸、48・・天秤
、 53・・クランクロンド、54・・糸通過規制装置
、 55・・水平送り軸、56・・糸道規制板、 59
・・送り用ステッピングモータ、  60・・リンクア
ーム、64・・可動輪、  67・・ミシンモータ、6
9・・速度検出器、 70・・回転カム、71・・布送
り基準信号発生器、 74・・第1アーム、 76・・第2アーム、85・・
クロックパルス発生器、 92・・CPU、 93・・ROM。 94・・RAM、   95・・パルスカウンタ、C・
・制御装置。 第5図 特許出願人  ブラザー工業株式会社 第3図 第4図 第 図 第10図 第11図
Figure 1 is a functional block diagram showing the configuration of the present invention, Figures 2-
Fig. 10 shows an embodiment of the present invention, Fig. 2 is a perspective view showing the internal mechanism of the sewing machine, Fig. 3 is a side view of the internal mechanism, Fig. 4 is a front view of the internal mechanism, and Fig. 4 is a front view of the internal mechanism. Figure 5 is a sectional view taken along the line V-V in Figure 4, Figure 6 is a sectional view taken along the line Vl-Vl in Figure 3,
Figure 7 is a time chart showing the operation of each mechanism of the sewing machine.
Figure 8 is a block diagram of the control system of the sewing machine, Figure 9 is a schematic flowchart of the feed operation start control routine, and Figure 10 explains the cloth feed start timing based on various cloth feed amounts at a specific rotation speed of the sewing machine main shaft. FIG. 11 is a diagram illustrating the relationship between the cloth feeding operation and the needle thread release period according to the prior art. M... Sewing machine, 10... Needle bar, 12... Sewing needle, 14
・・Needle thread, 28・・Sewing machine main shaft, 34・・Subshaft, 3
6. Swing lever 43.. Feed base, 47.. Vertical feed shaft, 48.. Take-up lever, 53.. Crank lock, 54.. Thread passage regulating device, 55.. Horizontal feed shaft, 56.. Thread path. regulation plate, 59
・・Stepping motor for feeding, 60・・Link arm, 64・・Movable wheel, 67・・Sewing machine motor, 6
9... Speed detector, 70... Rotating cam, 71... Cloth feed reference signal generator, 74... First arm, 76... Second arm, 85...
Clock pulse generator, 92...CPU, 93...ROM. 94...RAM, 95...Pulse counter, C...
·Control device. Figure 5 Patent applicant: Brother Industries, Ltd. Figure 3 Figure 4 Figure 10 Figure 11

Claims (1)

【特許請求の範囲】[Claims] (1)縫針を備えミシンモータで上軸を介して上下に往
復駆動される針棒と、前記針棒と調時してミシンモータ
で往復駆動される天秤と、糸供給源から天秤を経て縫針
に至る糸道経路のうちの天秤よりも上流側に設けられ、
上糸を拘束する接近位置と拘束しない離隔位置とに亙っ
て相対移動可能な1対の係合体と、前記上軸に作動的に
連結され、係合体を接近位置と離隔位置とに夫々所定の
タイミングで駆動する糸通過規制手段と、前記針棒と略
調時して送り歯で加工布を移送する送り機構と、前記送
り機構を駆動する送り用ステッピングモータと、前記送
り用ステッピングモータを制御する送り制御手段とを備
えたミシンにおいて、 前記上軸の回転速度を検出する速度検出手段及び上軸の
回転位相を検出する位相検出手段と、前記速度検出手段
と位相検出手段からの出力を受けて、両係合体による上
糸解放期間中に加工布移送の一部が実行され且つ上軸の
回転速度が大きくなる程加工布移送動作の開始タイミン
グが早まるようにその開始タイミングを決定するタイミ
ング決定手段と、 前記タイミング決定手段で決定された開始タイミングで
加工布の移送を開始するように送り制御手段に指令する
指令手段とを備えたことを特徴とするミシンの布送り制
御装置。
(1) A needle bar that is equipped with a sewing needle and is reciprocated up and down by the sewing machine motor via an upper shaft, a thread take-up that is synchronized with the needle bar and driven back and forth by the sewing machine motor, and a sewing needle that flows from the thread supply source through the thread take-up. It is installed upstream of the thread take-up in the thread path leading to the thread take-up.
a pair of engaging bodies that are movable relative to each other between an approach position where the needle thread is restrained and a separated position where the upper thread is not restrained; and a pair of engaging bodies that are operatively connected to the upper shaft and that position the engaging bodies in the approached position and the separated position, respectively. a thread passage regulating means that is driven at a timing of , a feed mechanism that transports the work cloth using a feed dog in approximately synchronization with the needle bar, a feeding stepping motor that drives the feeding mechanism, and a feeding stepping motor that drives the feeding stepping motor. A sewing machine comprising: a speed detection means for detecting the rotational speed of the upper shaft; a phase detection means for detecting the rotational phase of the upper shaft; and outputs from the speed detection means and the phase detection means. Accordingly, the start timing is determined such that part of the work cloth transfer is executed during the upper thread release period by both engaging bodies, and the start timing of the work cloth transfer operation is earlier as the rotational speed of the upper shaft increases. A cloth feed control device for a sewing machine, comprising: a determining means; and a command means for instructing a feed control means to start transferring the work cloth at the start timing determined by the timing determining means.
JP3420089A 1989-02-13 1989-02-13 Cloth feed-controlling device for sewing machine Pending JPH02213386A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3420089A JPH02213386A (en) 1989-02-13 1989-02-13 Cloth feed-controlling device for sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3420089A JPH02213386A (en) 1989-02-13 1989-02-13 Cloth feed-controlling device for sewing machine

Publications (1)

Publication Number Publication Date
JPH02213386A true JPH02213386A (en) 1990-08-24

Family

ID=12407523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3420089A Pending JPH02213386A (en) 1989-02-13 1989-02-13 Cloth feed-controlling device for sewing machine

Country Status (1)

Country Link
JP (1) JPH02213386A (en)

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