JPH0438988A - Electronic control type zigzag sewing machine - Google Patents

Abstract

PURPOSE:To certainly form an initial needle thread loop having an adequate shape and size by providing a first controller which controls a needle bar up-and-down motion driver, and a second controller which issues an instruction to a throat plate driver so that the throat plate is moved from the rising position to the falling position. CONSTITUTION:A needle bar 8 is moved up and down by a needle bar up-and-down motion driver which is controlled by a first controller, and simultaneously swung by a needle bar swing driver. On the other hand, a second controller issues an instruction to the first controller so as to stop the needle bar 8 at the lowest position for a specified time period, and instructs a throat plate driver to move a throat plate, on which a workpiece of fabric is placed, from the rising position to the falling position within the stopping period of the needle bar, before a hook 26a of a needle thread catcher 26 is connected to a needle thread 29 on a needle 10 side. Therefore, the throat plate is moved to the falling position, which is a specified short distance lower than the rising position, while the needle bar is swung to the maximum swing position on the left and stopped at the lowest position, and the needle thread between the eye of the needle 10 and the fabric is slacked off so that an initial needle thread loop is formed and the hook 26a is surely connected to the initial needle thread loop.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電子制御式ジグザグミシンに関し、特に上糸捕
捉器の剣先が係合する上糸初期ループを針板の下降によ
り形成するようにしたものに関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electronically controlled zigzag sewing machine, and in particular to an electronically controlled zigzag sewing machine in which an initial loop of the needle thread that engages with the tip of the needle thread catcher is formed by lowering the needle plate. related to things.

〔従来技術〕[Prior art]

一般に、針棒を上下動させる針棒上下駆動機構と針棒を
揺動させる針棒揺動駆動機構と送り歯を上下方向・前後
方向に駆動する送り歯駆動機構と上糸捕捉器などを備え
、ミシンモータで駆動される上軸や下軸の回転駆動によ
りこれらの機構を同期させて駆動し、加工布に直線縫い
ゃジグザグ縫いゃ模様縫いなどが可能な種々のジグザグ
ミシンが実用化されている。In general, it is equipped with a needle bar vertical drive mechanism that moves the needle bar up and down, a needle bar swing drive mechanism that swings the needle bar, a feed dog drive mechanism that drives the feed dog in the vertical and front-back directions, and an upper thread catcher. Various zigzag sewing machines have been put into practical use, in which these mechanisms are synchronously driven by the rotation of the upper and lower shafts driven by the sewing machine motor, and are capable of performing straight stitches, zigzag stitches, pattern stitches, etc. on workpiece fabrics. There is.

ところで、このジグザグミシンでは、針棒が下降して加
工布を刺挿後景下位置に達し最下位置から若干（約２ｍ
ｓ＋）上昇したとき、つまり実施例に係る第９図に示す
ように、縫針１０の目孔１０ａ近傍において加工布Ｗか
ら目孔１０ａまでの上糸部分が弛んで上糸初期ループ２
９ａが形成されたときに、上糸捕捉器の剣先２６ａがこ
の上糸初期ループ２９ａに係合して回転するので、この
上糸初期ループ２９ａが拡大して上糸と下糸とが交絡す
るようになっている。By the way, in this zigzag sewing machine, the needle bar descends and reaches the bottom position after inserting the work cloth, and is slightly (approximately 2 m) from the lowest position.
s+), as shown in FIG. 9 according to the embodiment, the upper thread portion from the work cloth W to the eyelet 10a becomes loose near the eyelet 10a of the sewing needle 10, and the upper thread initial loop 2
9a is formed, the tip 26a of the upper thread catcher engages with this upper thread initial loop 29a and rotates, so this upper thread initial loop 29a expands and the upper thread and lower thread become intertwined. It looks like this.

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

従来のジグザグミシンにおいては、通常、針棒が揺動中
心位置つまり直線縫い時の針棒位置での上下動において
、適切な大きさの上糸初期ループが形成されたときに剣
先がこの上糸初期ループに係合するように、剣先の出合
いタイミングが調整されている。In conventional zigzag sewing machines, when the needle bar moves up and down at the swing center position, that is, at the needle bar position during straight stitching, when an initial loop of the needle thread of an appropriate size is formed, the tip of the needle moves this needle thread. The meeting timing of the tip of the sword is adjusted so that it engages the initial loop.

従って、針棒が揺動中心位置に対して右側と左側とに夫
々揺動するジグザグ纏いの場合、針棒が右側に揺動した
ときの剣先の出合いタイミングは直線縫い時の出合いタ
イミングより早く　（剣先の回転方向によっては遅くな
る場合もある）なり、上糸初期ループが適切な大きさま
で拡大しないうちに剣先が出会うことになるので、剣先
がこの上糸初期ループに係合せずに通過して目飛びが生
じるという問題がある。Therefore, in the case of zigzag stitching in which the needle bar swings to the right and left sides of the swing center position, when the needle bar swings to the right, the timing at which the tip of the sword meets is earlier than the timing at which it meets during straight stitching ( (It may be slower depending on the direction of rotation of the tip), and the tip will meet before the initial loop of the upper thread has expanded to an appropriate size, so the tip will pass through this initial loop of the upper thread without engaging it. There is a problem that skipped stitches occur.

一方、針棒が左側に揺動したときの剣先の出合いタイミ
ングは直線縫い時の出合いタイミングより遅くなり、上
糸初期ループが十分に拡大することになるが、上糸初期
ループが大きくなりすぎて上糸の捻じれにより上糸初期
ループを形成している上糸部分が縫針に巻付くことがあ
り、この場合も剣先が係合せずに通過してしまうので同
様に目飛びが生じるという問題がある。On the other hand, when the needle bar swings to the left, the timing at which the tip of the blade meets is later than when sewing in a straight line, and the initial loop of the upper thread is sufficiently enlarged, but the initial loop of the upper thread becomes too large. Due to the twisting of the upper thread, the upper thread that forms the initial loop of the upper thread may wrap around the sewing needle, and in this case, the tip passes through without engaging, causing the same problem of skipped stitches. be.

本発明の目的は、適切な形状・大きさの上糸初期ループ
を確実に形成し得る電子制御式ジグザグミシンを提供す
ることにある。An object of the present invention is to provide an electronically controlled zigzag sewing machine that can reliably form a needle thread initial loop of an appropriate shape and size.

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

本発明に係る電子制御式ジグザグミシンは、第１図の機
能ブロック図に示すように、針板と、縫針が下端に取付
けられた針棒と、針棒の上下動に調時させて針棒を揺動
させる針棒揺動駆動手段と、上糸捕捉器とを備えたミシ
ンにおいて、針棒を独立に上下駆動する針棒上下駆動手
段と、針棒上下駆動手段を制御する第１制御手段と、針
棒の上下動に関連する位相信号を出力する位相検出手段
と、少なくとも針板上面が送り歯の上面より上方となる
上昇位置と針板上面が送り歯の上面より上方で且つ上昇
位置より所定小距離だけ低い下降位置とに移動可能な針
板を、昇降駆動する為の針板駆動手段と、位相検出手段
からの信号を受け、針棒を最下位置で所定期間に亙って
停止させるように第１制御手段に指令するとともに、そ
の針棒停止期間内で且つ上糸捕捉器の剣先が縫針側の上
糸に係合する前に針板を上昇位置から下降位置に移動さ
せるように針板駆動手段に指令する第２制御手段とを備
えたものである。As shown in the functional block diagram of FIG. 1, the electronically controlled zigzag sewing machine according to the present invention includes a throat plate, a needle bar with a sewing needle attached to the lower end, and a needle bar that is synchronized with the vertical movement of the needle bar. In a sewing machine equipped with a needle bar swinging drive means for swinging the needle bar, and an upper thread catcher, the needle bar up and down drive means independently drives the needle bar up and down, and a first control means for controlling the needle bar up and down drive means. and a phase detection means for outputting a phase signal related to the vertical movement of the needle bar; at least a raised position where the top surface of the needle plate is above the top surface of the feed dog; and a raised position where the top surface of the throat plate is above the top surface of the feed dog. A throat plate drive means for raising and lowering the needle plate, which can be moved to a lower lowered position by a predetermined short distance, and a signal from the phase detection means are received, and the needle bar is held at the lowest position for a predetermined period of time. The first control means is commanded to stop the needle bar, and the needle plate is moved from the raised position to the lowered position within the needle bar stop period and before the tip of the needle thread catcher engages with the needle thread on the sewing needle side. and a second control means for instructing the throat plate drive means to do so.

〔作用〕[Effect]

本発明に係る電子制御式ジグザグミシンにおいては、針
棒は、第１制御手段で制御される針棒上下駆動手段によ
り上下駆動されるとともに、針棒揺動駆動手段により揺
動駆動される。In the electronically controlled zigzag sewing machine according to the present invention, the needle bar is driven up and down by the needle bar vertical drive means controlled by the first control means, and is oscillated by the needle bar swing drive means.

一方、第２制御手段は、位相検出手段から位相信号を受
け、針棒を最下位置で所定期間に亙って停止させるよう
に第１制御手段に指令し、同時にその針棒停止期間内で
且つ上糸捕捉器の剣先が縫針側の上糸に係合する前に加
工布が載置された針板を上昇位置から下降位置に移動さ
せるように針板駆動手段に指令する。On the other hand, the second control means receives the phase signal from the phase detection means and instructs the first control means to stop the needle bar at the lowest position for a predetermined period of time, and at the same time, within the needle bar stop period. In addition, before the point of the needle thread catcher engages with the needle thread on the sewing needle side, the needle plate driving means is commanded to move the throat plate on which the work cloth is placed from the raised position to the lowered position.

従って、針棒が右最大揺動位置或いは左最大揺動位置に
揺動して最下位置に停止中に、針板は上昇位置より所定
小距離だけ低い下降位置に移動して、縫針の目礼から加
工布までの上糸部分が弛んで上糸初期ループが形成され
るので、針棒が右最大揺動位置のときにもまた揺動中心
位置のときにもまた左最大揺動位置のときにも常に適切
な大きさの形状の一定の上糸初期ループが形成されるこ
とになる。従って、この上糸初期ループに剣先が常に確
実に係合する。Therefore, while the needle bar swings to the right maximum swing position or the left maximum swing position and stops at the lowest position, the needle plate moves to the lowered position, which is a predetermined short distance lower than the raised position, and the eye of the sewing needle is The upper thread from the bow to the workpiece cloth is loosened and an initial loop of the upper thread is formed, so that when the needle bar is at the maximum right swing position, and when it is at the center of swing, it also remains at the maximum left swing position. A constant initial needle thread loop of the appropriate size and shape is always formed. Therefore, the tip of the needle always reliably engages with this initial loop of the upper thread.

〔発明の効果〕〔Effect of the invention〕

本発明に係る電子制御式ジグザグミシンによれば、前記
〔作用〕の項で説明したように、第１制御手段、位相検
出手段、針板駆動手段、第２制御手段などを設け、針棒
の駆動をその最下位置で停止させた状態で針板の上昇位
置から下降位置への移動を介して上糸初期ループを形成
するようにしたので、針棒の揺動位置に拘わらず縫針の
目孔から加工布までの上糸部分で常に適切な大きさ・形
状の上糸初期ループを形成することが出来る。これによ
り、剣先を上糸初期ループに確実に係合させて目飛びの
ない綺麗な縫製が可能になる。According to the electronically controlled zigzag sewing machine according to the present invention, the first control means, the phase detection means, the throat plate drive means, the second control means, etc. are provided, and the needle bar is controlled. Since the needle thread initial loop is formed by moving the needle plate from the raised position to the lowered position while the drive is stopped at its lowest position, the eye of the sewing needle remains unchanged regardless of the swinging position of the needle bar. An initial needle thread loop of an appropriate size and shape can always be formed in the needle thread portion from the hole to the work cloth. As a result, the tip of the sewing machine can be reliably engaged with the initial loop of the needle thread, and beautiful sewing without skipped stitches can be performed.

〔実施例〕〔Example〕

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

本実施例は模様纏いが可能な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 where the present invention is applied to an electronically controlled zigzag sewing machine capable of sewing patterns.

電子制御式ジグザグミシンのアーム部内には、針棒８を
独立に上下に往復駆動する針棒上下駆動機構、針棒８を
左右に揺動する針棒揺動駆動機構、天秤を上下に往復駆
動する天秤駆動機構が組み込まれ、ベツド部２内には、
剣先２６ａを介して上糸を下糸に交絡（結！ｆｆｆ）さ
せる上糸捕捉器２６、送り歯１２を上下方向に駆動せず
に前後にのみ往復駆動する送り備前後動機構とが組み込
まれ、これらの機構のうち針棒上下駆動機構以外のもの
は通常のミシンのものと概ね同様であり、天秤駆動機構
と上糸捕捉器２６と送り備前後動機構とはミシンモータ
３３で回転駆動される上軸や下軸を介して駆動される。Inside the arm of the electronically controlled zigzag sewing machine, there are a needle bar vertical drive mechanism that independently reciprocates the needle bar 8 up and down, a needle bar swing drive mechanism that swings the needle bar 8 from side to side, and a needle bar reciprocating mechanism that drives the thread take-up up and down. A balance drive mechanism is incorporated in the bed section 2, and
It incorporates an upper thread catcher 26 that intertwines (tie! fff) the upper thread with the lower thread via the tip 26a, and a forward and backward movement mechanism for the feed dog 12 that reciprocates only back and forth without driving the feed dog 12 in the vertical direction. Of these mechanisms, the mechanisms other than the needle bar vertical drive mechanism are generally the same as those of a normal sewing machine, and the thread take-up mechanism, needle thread catcher 26, and feed reserve forward and backward movement mechanism are rotationally driven by the sewing machine motor 33. It is driven via the upper and lower shafts.

針棒上下駆動機構と針棒揺動駆動機構とについて、第２
図に基いて説明すると、頭部３に上下方向向きに配設さ
れた針棒台５はその上端部で機枠４に固着された枢支ピ
ン７により揺動可能に支持され、この針棒台５には針棒
８が上下動可能に支持されており、針棒８の下端には縫
針１０が取付けられている。Regarding the needle bar vertical drive mechanism and needle bar swing drive mechanism, the second
To explain based on the figure, a needle bar stand 5 arranged vertically on the head 3 is swingably supported at its upper end by a pivot pin 7 fixed to the machine frame 4. A needle bar 8 is supported on the stand 5 so as to be movable up and down, and a sewing needle 10 is attached to the lower end of the needle bar 8.

針棒８に固着されたピン９は針棒台５のスリット１１を
挿通して前方へ突出し、このビン９の前端部は機枠４に
上下方向移動自在に支持されたラック部材１３の左右に
細長い切欠部１５に保合され、このラック部材１３のラ
ック１７は針棒駆動用ステッピングモータ３０の駆動軸
に固着した駆動ギヤ１９に噛合している。従って、針棒
駆動用ステンピングモータ３０の正回転及び逆回転によ
り針棒８と縫針１０が上下往復運動するようになってい
る。前記針棒台５の下端部は連杆２１を介して針棒揺動
用ステッピングモータ３１　（第５図参照）に連結され
、ステンピングモータ３１の駆動により針棒台５と針棒
８を介して縫針１０が左右に揺動するようになっている
。A pin 9 fixed to the needle bar 8 passes through a slit 11 in the needle bar base 5 and projects forward. The rack 17 of the rack member 13 is held in the elongated notch 15 and meshes with a drive gear 19 fixed to a drive shaft of a stepping motor 30 for driving the needle bar. Therefore, the needle bar 8 and the sewing needle 10 are caused to reciprocate up and down by the forward and reverse rotation of the needle bar driving stamping motor 30. The lower end of the needle bar base 5 is connected to a stepping motor 31 (see FIG. 5) for swinging the needle bar through a connecting rod 21, and the needle bar swinging motor 31 (see FIG. 5) is connected to the needle bar base 5 and the needle bar 8 by driving the stepping motor 31. The sewing needle 10 is designed to swing left and right.

更に、ベツド部２内には上下に移動可能な針板６を昇降
駆動する為の針板駆動機構１４が設けられている。Furthermore, a throat plate drive mechanism 14 is provided within the bed portion 2 for driving the vertically movable throat plate 6 up and down.

次に、上下に移動可能な針板６について、第３図・第４
図に基いて説明する。Next, regarding the vertically movable throat plate 6, see Figures 3 and 4.
This will be explained based on the diagram.

前記ベツド部２の機枠４には矩形状の切欠部４Ｃが形成
され、針棒８の下側で切欠部４Ｃの略左半部分には正面
視コ字状の針板６が配設されている。針ｖｉ、６の左端
部には上下方向に延びるガイド部６ｂが形成され、ガイ
ド部６ｂの上端部には上端部から水平に右方へ延び加工
布Ｗを載置するための布載置部６ａが一体形成されると
ともに、ガイド部６ｂの下端部には下端部から水平に右
方へ延びる補助ガイド部６ｃが一体形成され、ガイド部
６ｂと補助ガイド部６ｃの右端部とにはガイド孔６ｄ・
６ｅが夫々形成され、針板６はこれらガイド孔６ｄ・６
ｅに機枠４のガイド部４ａ・４ｂを夫々を挿通させるこ
とにより、上下移動可能になっている。この針板６は、
布載置部６ａの上面（針板６の上面）が第４図に示すよ
うにベツド部２の上面と同一高さで且つ送り歯１２の上
面より約３−麟上方となる最上位置と、針板６の上面が
送り歯１２の上面より上方で且つ最上位置より約２ＩＩ
Ｉ１１だけ低い上昇位置と、針板６の上面が送り歯１２
の上面より約１ｍｍだけ下方となる下降位置との３位置
に上下移動可能である。尚、布載置部６ａには縫針１０
が挿通し得る長円形の針孔（図示路）と送り歯１２が上
下移動及び前後移動し得る送り歯用透孔６ｆが形成され
ている。尚、前記最上位置は特許請求の範囲に記載の上
昇位置に相当しまた上屏位置は特許請求の範囲に記載の
下降位置に相当する。A rectangular notch 4C is formed in the machine frame 4 of the bed portion 2, and a needle plate 6 having a U-shape when viewed from the front is disposed on the lower side of the needle bar 8 and approximately on the left half of the notch 4C. ing. A guide portion 6b extending in the vertical direction is formed at the left end portion of the needles vi, 6, and a cloth placement portion extending horizontally to the right from the upper end portion is provided at the upper end portion of the guide portion 6b for placing the work cloth W thereon. 6a, and an auxiliary guide part 6c is integrally formed at the lower end of the guide part 6b, extending horizontally to the right from the lower end, and a guide hole is formed at the right end of the guide part 6b and the auxiliary guide part 6c. 6d・
6e are formed respectively, and the throat plate 6 is formed with these guide holes 6d and 6.
By inserting the guide portions 4a and 4b of the machine frame 4 through the guide portions 4a and 4b of the machine frame 4, the machine frame 4 can be moved up and down. This throat plate 6 is
the uppermost position where the upper surface of the cloth placement portion 6a (the upper surface of the throat plate 6) is at the same height as the upper surface of the bed portion 2 and approximately 3 mm above the upper surface of the feed dog 12, as shown in FIG. The top surface of the throat plate 6 is above the top surface of the feed dog 12 and approximately 2II from the top position.
The raised position is lower by I11, and the upper surface of the throat plate 6 is at the feed dog 12.
It can be moved up and down to three positions, including a lowered position that is approximately 1 mm below the top surface of the holder. Note that a sewing needle 10 is mounted on the cloth placement portion 6a.
An oval needle hole (the path shown in the figure) through which the needle can be inserted, and a feed dog through hole 6f through which the feed dog 12 can move vertically and back and forth are formed. The uppermost position corresponds to the raised position described in the claims, and the uppermost position corresponds to the lowered position described in the claims.

次に、この針板６を昇降駆動させる為の針板駆動機構１
４について説明すると、前記ガイド部６ｂの左端面には
ラック１６が形成されたラック部材１８が上下方向向き
に固着され、このラック１６に噛合する駆動ギヤ２０を
取付けた針板駆動用ステッピングモータ３２が機枠４に
取付けられている。従って、ステッピングモータ３２の
駆動により駆動ギヤ２０、ラック１６、ラック部材１８
を介して針板６が前記３位置に昇降駆動される。Next, a throat plate drive mechanism 1 for driving the throat plate 6 up and down.
4, a rack member 18 on which a rack 16 is formed is vertically fixed to the left end surface of the guide portion 6b, and a stepping motor 32 for driving the needle plate is attached with a drive gear 20 that meshes with the rack 16. is attached to the machine frame 4. Therefore, the drive gear 20, rack 16, and rack member 18 are driven by the stepping motor 32.
The needle plate 6 is moved up and down to the three positions.

次に、針板６に取付けられ加工布Ｗを針板６上に押える
押え機構２２について説明する。Next, the presser mechanism 22, which is attached to the throat plate 6 and presses the work cloth W onto the throat plate 6, will be explained.

第３図・第４図に示すように、押え機構２２は、送り歯
１２に対向する針板６上面に機構され薄いハネ鋼板から
なる略矩形状で加工布Ｗを針板６上に押える布押え部材
２３と、前記切欠部４Ｃの略右半部分に配設され薄いハ
ネ鋼板からなり布押え部材２３を針板６へ弾性付勢する
正面視略台形状の弾性付勢部材２４とからなり、布押え
部材２３の右端部に弾性付勢部材２４を一体形成したも
のである。As shown in FIGS. 3 and 4, the presser mechanism 22 has a substantially rectangular shape made of a thin spring steel plate and is mounted on the upper surface of the throat plate 6 facing the feed dog 12. It consists of a presser member 23 and an elastic biasing member 24, which is disposed approximately on the right half of the notch 4C and is made of a thin spring steel plate and has a generally trapezoidal shape in front view and elastically biases the cloth presser member 23 toward the throat plate 6. , an elastic biasing member 24 is integrally formed on the right end portion of the presser member 23.

弾性付勢部材２４は、布押え部材２３の右端部から連続
して右斜め上方に延びる連結部２４ａと連結部２４ａか
ら右方へ延びる水平部２４ｂと水平部２４ｂの右端部か
ら下方へ延びる鉛直部２４Ｃと鉛直部２４ｃの下端部か
ら左方へ延び切欠部４ｃの略右半部分を覆う前後に広幅
の布受は部２４ｄと布受は部２４ｄの左端部から段落ち
して左方へ延び弾性付勢部材２４を針板６に取付ける取
付部２４ｅとからなり、連結部２４ａと水平部２４ｂと
鉛直部２４ｃと布受は部２４ｄとで布押え部材２３を針
板６に弾性付勢する弾性力が発生するように構成される
とともに、これらの内側に縫製する加工布Ｗの布端部分
を収容可能になっている。従って、連結部２４ａと水平
部２４ｂと鉛直部２４ｃとは縫製時に加工布Ｗの移送の
邪魔にならないように、これらの前後方向の幅は狭くな
っている。The elastic biasing member 24 includes a connecting portion 24a extending diagonally upward to the right continuously from the right end of the presser foot member 23, a horizontal portion 24b extending rightward from the connecting portion 24a, and a vertical portion extending downward from the right end of the horizontal portion 24b. Section 24C and the cloth receiver, which is wide in the front and rear, extend leftward from the lower end of the vertical section 24c and cover approximately the right half of the notch 4c. It consists of a mounting part 24e that attaches the elongated elastic biasing member 24 to the throat plate 6, and a connecting part 24a, a horizontal part 24b, a vertical part 24c, and a cloth receiver part 24d that elastically biases the presser foot member 23 to the throat plate 6. They are constructed so as to generate an elastic force, and can accommodate the ends of the work cloth W to be sewn inside these. Therefore, the widths of the connecting portion 24a, the horizontal portion 24b, and the vertical portion 24c in the front-rear direction are narrow so that they do not interfere with the transfer of the work cloth W during sewing.

布押え部材２３は、弾性付勢部材２４を介して針板６に
取付けられ、布押え部材２３ば針板６に取付けられた弾
性付勢部材２４の弾性付勢力により針板６上に弾性付勢
されているので、針板６が前記３位置に移動しても、布
押え部材２３の弾性付勢力は針板６を昇降駆動する駆動
力に何ら影響を与えることはなく、針板駆動機構１４の
ステッピングモータ３２は針板６の移動駆動に要する小
さな駆動力を伝達するだけの小型のものにすることがで
きる。尚、布押え部材２３には縫針１０の挿通を許容す
る挿通孔２３ａが形成されている。The cloth presser member 23 is attached to the throat plate 6 via an elastic biasing member 24, and the cloth presser member 23 is elastically biased onto the throat plate 6 by the elastic biasing force of the elastic biasing member 24 attached to the throat plate 6. Therefore, even if the throat plate 6 moves to the three positions mentioned above, the elastic biasing force of the presser foot member 23 has no effect on the driving force that drives the throat plate 6 up and down, and the throat plate drive mechanism The fourteen stepping motors 32 can be made small enough to transmit the small driving force required to move the throat plate 6. Note that the presser member 23 is formed with an insertion hole 23a through which the sewing needle 10 is inserted.

上糸捕捉器２６は送り歯１２の直く下側に配設されてお
り、針棒揺動駆動機構により縫針１０が二点鎖線で図示
の右最大揺動位置１０（Ｒ）や三点鎖線で図示の左最大
揺動位置１０（Ｌ）及び実線で図示の揺動中心位置１０
（Ｃ）に移動したときでも、剣先２６ａ（第９図参照）
で縫針１０側の上糸２９を捕捉し得るようになっている
。The needle thread catcher 26 is disposed directly below the feed dog 12, and the needle bar swing drive mechanism moves the sewing needle 10 to the right maximum swing position 10 (R) shown by the two-dot chain line, or to the right maximum swing position 10 (R) shown by the three-dot chain line. The left maximum swing position 10 (L) shown in the figure and the swing center position 10 shown in the solid line
Even when moving to (C), the tip 26a (see Figure 9)
The needle thread 29 on the sewing needle 10 side can be captured by the needle 10.

そして、送り画工２が固着された前後移動部材２８は、
布送りタイミングのときに第４図に示す高さ位置で前方
向或いは後方向に移動駆動される。The forward and backward moving member 28 to which the feeder 2 is fixed is
At the cloth feeding timing, it is driven to move forward or backward at the height position shown in FIG. 4.

次に、ミシンの制御系は第５図のブロックに示すように
構成されている。Next, the control system of the sewing machine is constructed as shown in the block diagram of FIG.

モータ３０〜３３は駆動回路３４〜３７を介して、設定
速度信号Ｖｓを出力するスピードボリューム４０はＡ／
Ｄ変換器４１を介して、縫製運転の開始・停止を指示す
る起動・停止スイッチ３８、所望の縫製模様を選択する
テンキーからなる模様選択スイッチ３９、タイミング信
号発生器４２は制御装置Ｃの入出力インターフェイス４
３に夫々接続されている。The motors 30 to 33 are connected via drive circuits 34 to 37, and the speed volume 40 that outputs the set speed signal Vs is connected to the A/
Via the D converter 41, a start/stop switch 38 instructs to start and stop the sewing operation, a pattern selection switch 39 consisting of a numeric keypad to select a desired sewing pattern, and a timing signal generator 42 are input/output of the control device C. Interface 4
3, respectively.

タイミング信号発生器４２について簡単に説明すると、
上軸に取付けられた円板状のディスクの周縁部にスリッ
トが所定間隔毎にＮ個（例えば、７２個）設けられ、縫
針１０の最上位置を基準位置としてセンサでこれらのス
リットを検出した検出信号（位相信号）を出力するもの
で、これらの検出信号をカウントすることにより各ステ
ッピングモータ３０〜３２を調時して制御するようにな
っている。A brief explanation of the timing signal generator 42 is as follows.
N slits (for example, 72) are provided at predetermined intervals on the peripheral edge of a disc-shaped disk attached to the upper shaft, and a sensor detects these slits using the uppermost position of the sewing needle 10 as a reference position. It outputs signals (phase signals), and by counting these detection signals, each of the stepping motors 30 to 32 is timed and controlled.

制御装置ＣはＣＰＵ４５と、ＣＰＵ４５にデ−タバスな
どのバス４４を介して接続された入出力インターフェイ
ス４３、ＲＯＭ５０及びＲＡＭ６０とから構成されてい
る。The control device C is composed of a CPU 45, an input/output interface 43 connected to the CPU 45 via a bus 44 such as a data bus, a ROM 50, and a RAM 60.

ＲＯＭ５０の縫目模様データメモリ５１には、文字や記
号やマークなどの多数の縫目模様の夫々について各縫動
作毎の針位置データを模様番号と対応させて記憶してい
る。The stitch pattern data memory 51 of the ROM 50 stores needle position data for each sewing operation for each of a large number of stitch patterns such as letters, symbols, and marks in correspondence with pattern numbers.

プログラムメモリ５２には、スピードボリューム４０か
ら出力される設定速度信号Ｖｓと起動・停止スイッチ３
８から出力される起動信号や停止信号とタイミング信号
発生器４２からの検出信号と縫目模様データとに基いて
モータ３１・３３を夫々制御する制御プログラム、針棒
駆動用ステッピングモータ３０を制御する針棒制御プロ
グラム、上糸ループ形成制御の制御プログラムなどが格
納されている。The program memory 52 includes the set speed signal Vs output from the speed volume 40 and the start/stop switch 3.
A control program that controls the motors 31 and 33, respectively, based on the start signal and stop signal output from the timing signal generator 8, the detection signal from the timing signal generator 42, and the stitch pattern data, and the stepping motor 30 for driving the needle bar. A needle bar control program, a control program for needle thread loop formation control, etc. are stored.

ＲＡＭ６０の第１カウンタ６１には、タイミング信号発
生器４２から出力される検出信号を針棒８の最上位置で
ある位相角０度からカウントしたカウント値（そのカウ
ント値をＩとする）が格納される。The first counter 61 of the RAM 60 stores a count value obtained by counting the detection signal output from the timing signal generator 42 from a phase angle of 0 degrees, which is the top position of the needle bar 8 (the count value is designated as I). Ru.

第２カウンタ６２には、ステッピングモータ３０に供給
する駆動パルス数をカウントしたカウント値（そのカウ
ント値をＭとする）が格納される。The second counter 62 stores a count value obtained by counting the number of drive pulses supplied to the stepping motor 30 (the count value is defined as M).

フラグメモリ６３には、針棒８の駆動を停止させるとき
にセット（データ「１」）され、針棒８を駆動させると
きにリセット（データ「０」）される針棒駆動停止フラ
グＦのフラグデータが格納される。The flag memory 63 includes a needle bar drive stop flag F that is set (data "1") when stopping the driving of the needle bar 8 and reset (data "0") when driving the needle bar 8. Data is stored.

更に、ＲＡＭ６０には、ＣＰＵ４５で演算処理した結果
を一時的に記憶する各種のメモリやカウンタなどが設け
られている。Further, the RAM 60 is provided with various types of memories, counters, etc. that temporarily store the results of calculations performed by the CPU 45.

次に、ミシンの制御装置Ｃで行なわれる上糸ループ形成
制御のルーチンについて、第８図のタイムチャートを参
照しながら第７図のフローチャートに基いて説明する。Next, a routine for controlling needle thread loop formation performed by the control device C of the sewing machine will be described based on the flowchart of FIG. 7 while referring to the time chart of FIG. 8.

説明の都合上、ＣＰＵ４５に対してｌｌｌ５ｅｃ毎の割
り込みで処理される針棒制御のルーチンについて、第６
図のフローチャートに基いて先に説明する。図中５ｉ（
ｉ＝１．２．３、・・・）は各ステップである。For convenience of explanation, the needle bar control routine that is processed by interrupting the CPU 45 every ll5ec will be described in the sixth section.
The process will first be explained based on the flowchart shown in the figure. 5i in the figure (
i=1.2.3,...) is each step.

起動・停止スイッチ３８がＯＮされたときには、制御装
置Ｃ内のソフトタイマ（その計測時間をｔとする）の計
測が開始され、ＣＰＵ４５に対して１　ｍ５ｅｃ毎に割
り込みが発生するとこの制御が開始され、カウント値Ｉ
が「０」のときつまり針棒８が最上位置のときでカウン
ト値■がクリアされたときには（Ｓ４０：Ｙｅｓ）、カ
ウント値Ｍもクリアされ（Ｓ４１）、スピードボリュー
ム４０からの設定速度信号Ｖｓが読込まれる（Ｓ４２）
。When the start/stop switch 38 is turned on, a soft timer in the control device C (its measurement time is t) starts measuring, and when an interrupt is generated to the CPU 45 every 1 m5ec, this control is started. , count value I
When is "0", that is, when the needle bar 8 is at the highest position, and the count value ■ is cleared (S40: Yes), the count value M is also cleared (S41), and the set speed signal Vs from the speed volume 40 is Read (S42)
.

フラグＦがリセットされているときには（Ｓ４３：Ｙｅ
ｓ）、カウント値Ｍと設定速度信号Ｖｓとに基いて、第
８図に示すように針棒８の運動曲線であるサインカーブ
の運動式における次に出力するＭ番目の駆動パルスのた
めの周期ＮＴが演算で求められ（Ｓ４４）、ソフトタイ
マの計測時間ｔと周期ＮＴとが合致して駆動パルスの出
力タイミングのときには（Ｓ４５：Ｙｅｓ）、駆動パル
スがステッピングモータ３０に出力され（Ｓ４６）、カ
ウント値Ｍが１つインクリメントされ（Ｓ４７）、ソフ
トタイマがリセットされ（Ｓ４８）、割り込み処理を終
了してメインルーチンに戻る。尚、Ｓ４０でＮｏと判定
されたときにはＳ４３に移行し、３４３でＹｅｓと判定
されて針棒８の駆動が停止されたとき及びＳ４５でＮｏ
と判定されたときには割り込み処理を終了してメインル
ーチンに戻る。When flag F is reset (S43: Ye
s), based on the count value M and the set speed signal Vs, determine the period for the next Mth drive pulse to be output in the motion equation of the sine curve, which is the motion curve of the needle bar 8, as shown in FIG. NT is calculated by calculation (S44), and when the measured time t of the soft timer and the period NT match and it is the timing to output the drive pulse (S45: Yes), the drive pulse is output to the stepping motor 30 (S46), The count value M is incremented by one (S47), the soft timer is reset (S48), the interrupt processing is ended, and the process returns to the main routine. Note that when the determination is No in S40, the process moves to S43, and when the determination is Yes in 343 and the driving of the needle bar 8 is stopped, and when the determination is No in S45.
When it is determined that this is the case, the interrupt processing is terminated and the process returns to the main routine.

次に、上糸ループ形成制御のルーチンについて説明する
。Next, a routine for controlling needle thread loop formation will be explained.

ミシンに電源が投入されるとこの制御が開始され、各カ
ウンタ６■・６２をリセットし、針棒８を初期設定位置
（例えば、最上位置）に移動するようにステッピングモ
ータ３２を初期設定するなどの初期設定処理が実行され
（Ｓ　１　）　、起動・停止スイッチ３８がＯＮされ（
Ｓ２：Ｙｅｓ）、タイミング信号発生器４２からの検出
信号が入力されたときには（３３：Ｙｅｓ）、カウント
値Ｉが１つインクリメントされ（Ｓ４）、カウント値■
がＮｌのときつまり布送りの終了に伴って針板６を最上
位置に移動させる位相角θ１（位相角約１００度）のと
きには（３５：Ｙｅｓ）、ステッピングモータ３２の駆
動開始タイミングの位相角θｌと駆動終了タイミングの
位相角θ２（位相角約１２０度）との差の位相角と設定
速度信号Ｖｓとに基いてステッピングモータ３２を駆動
する時間ｔ１を求め、次にこの駆動時間ｔ１と駆動パル
ス数（ｎｌ）とに基いて駆動パルスの周期Ｔ１が求めら
れ（Ｓ６）、周期Ｔ１毎にｎ１個の駆動パルスがステッ
ピングモータ３２に出力されて、針板６は位相角θ１か
ら位相角θ２に亙って下降位置から４ｍｍ上方の最上位
置に移動され（Ｓ７）、起動・停止スイッチ３８がＯＦ
Ｆされていないときには（３１９：Ｎｏ）、Ｓ３に戻る
。This control starts when the sewing machine is powered on, resets each counter 6 and 62, and initializes the stepping motor 32 to move the needle bar 8 to the initial setting position (for example, the highest position). The initial setting process is executed (S 1 ), and the start/stop switch 38 is turned on (
S2: Yes), when the detection signal from the timing signal generator 42 is input (33: Yes), the count value I is incremented by one (S4), and the count value ■
When is Nl, that is, when the phase angle θ1 (phase angle approximately 100 degrees) moves the throat plate 6 to the uppermost position with the end of cloth feeding (35: Yes), the phase angle θl of the drive start timing of the stepping motor 32 The time t1 for driving the stepping motor 32 is determined based on the difference between the phase angle θ2 (phase angle approximately 120 degrees) at the driving end timing and the set speed signal Vs, and then the driving time t1 and the driving pulse are determined. The period T1 of the driving pulse is determined based on the number (nl) (S6), and n1 driving pulses are output to the stepping motor 32 for each period T1, and the throat plate 6 changes from the phase angle θ1 to the phase angle θ2. It is then moved from the lowered position to the uppermost position 4 mm above (S7), and the start/stop switch 38 is turned OFF.
If it has not been F (319: No), the process returns to S3.

カウント値■がＮ２のときつまり針棒８の駆動を停止さ
せ且つ針板６を上昇位置に移動させる位相角θ３（位相
角約１５０度）のときには（Ｓ８：Ｙｅｓ）、フラグＦ
がセットされる（Ｓ９）。When the count value ■ is N2, that is, when the phase angle θ3 (phase angle approximately 150 degrees) causes the driving of the needle bar 8 to be stopped and the needle plate 6 to be moved to the raised position (S8: Yes), the flag F is set.
is set (S9).

従って、上述した針棒制御の３４３でＮＯと判定され、
針棒８の駆動が最下位１で停止される。そして、Ｓ６と
同様に駆動パルスの周期Ｔ２が演算で求められ（ＳＩＯ
）、周期Ｔ２毎にｎ２個の駆動パルスがステッピングモ
ータ３２に出力されて、針板６は位相角θ３から位相角
θ４（位相角１８０度）に亙って最上位置から２１１１
下方の上昇位置に移動される（Ｓｌｌ）。即ち、第９図
に示すように、針棒８の最下位置における上下動が停止
され且つ針板６が約２１１１１１下降するので、加工布
Ｗを刺挿した上糸２９は目孔１０ａから加工布Ｗまでの
上糸部分で一定の大きさの上糸初期ループ２９ａが形成
される。そして、位相角θ４から位相角θ５（位相角約
２１０度）に亙ってこの上糸初期ループ２９ａが形成さ
れた状態が保持される。つまり、位相角θ４から位相角
θ５に亙る期間において、縫針１０が右最大揺動位置１
０（Ｒ）で形成された上糸初期ループ２９ａ、縫針１０
が左最大揺動位置１０（Ｌ）で形成された上糸初期ルー
プ２９ａ及び縫針１０の揺動中心位置１０（Ｃ）で形成
された上糸初期ループ２９ａの何れの大きさも一定であ
り、この上糸初期ループ２９ａに上糸捕捉器２６の剣先
２６ａが確実に係合するので、目飛びのない綺麗なジグ
ザグ縫いゃ模様纏いが可能となる。Therefore, the determination in step 343 of the needle bar control described above is NO.
The driving of the needle bar 8 is stopped at the lowest position 1. Then, similarly to S6, the period T2 of the drive pulse is calculated (SIO
), n2 drive pulses are output to the stepping motor 32 every period T2, and the needle plate 6 is moved 2111 times from the top position over a phase angle θ3 to a phase angle θ4 (phase angle 180 degrees).
It is moved to the lower raised position (Sll). That is, as shown in FIG. 9, the vertical movement of the needle bar 8 at the lowest position is stopped and the needle plate 6 is lowered by about 211111 degrees, so that the needle thread 29 into which the work cloth W has been inserted is processed through the eye hole 10a. A needle thread initial loop 29a of a constant size is formed in the needle thread portion up to the cloth W. Then, the state in which the upper thread initial loop 29a is formed is maintained from the phase angle θ4 to the phase angle θ5 (phase angle approximately 210 degrees). That is, during the period from the phase angle θ4 to the phase angle θ5, the sewing needle 10 is at the right maximum swing position 1.
Upper thread initial loop 29a formed with 0(R), sewing needle 10
Both the size of the needle thread initial loop 29a formed at the left maximum swing position 10 (L) and the needle thread initial loop 29a formed at the swing center position 10 (C) of the sewing needle 10 are constant; Since the tip 26a of the needle thread catcher 26 reliably engages with the needle thread initial loop 29a, a beautiful zigzag stitch pattern without skipped stitches is possible.

カウント値ＩがＮ３のときつまり針棒８の駆動を再開さ
せる位相角θ５のときには（Ｓ１２：Ｙｅｓ）、フラグ
Ｆがリセットされる（Ｓ１３）。When the count value I is N3, that is, when the phase angle θ5 is such that driving of the needle bar 8 is restarted (S12: Yes), the flag F is reset (S13).

従って、上述した針棒制御のＳ４３でＹｅｓと判定され
、針棒８が最下位置から上動駆動される。Therefore, the determination in S43 of the needle bar control described above is YES, and the needle bar 8 is driven upward from the lowest position.

カウント値ＩがＮ４のときつまり布送りのために針板６
を下降位置に移動させる位相角θ６（位相角約２８０度
）のときには（Ｓ１４：Ｙｅｓ）、Ｓ６と同様に駆動パ
ルスの周期Ｔ４が演算で求められ（Ｓ１５）、周期Ｔ４
毎にｎ４個の駆動パルスがステッピングモータ３２に出
力されて、針板６は位相角θ６から位相角θ７（位相角
３２０度）に亙って上昇位置から２ｎ＋ｍ下方の下降位
置に移動される（５１６）。そして、位相角θ７から位
相角θ１に亙る期間内で、送り歯１２が前方或いは後方
へ移動されて加工布Ｗが移送される。When the count value I is N4, that is, the throat plate 6 is
When the phase angle is θ6 (phase angle approximately 280 degrees) to move the drive pulse to the lowered position (S14: Yes), the period T4 of the drive pulse is calculated by calculation in the same way as S6 (S15), and the period T4
n4 drive pulses are output to the stepping motor 32 every time, and the throat plate 6 is moved from the raised position to the lowered position 2n+m below over the phase angle θ6 to phase angle θ7 (phase angle 320 degrees) ( 516). Then, within a period from phase angle θ7 to phase angle θ1, feed dog 12 is moved forward or backward, and work cloth W is transferred.

また、カウント値■がＮとなったときつまり針棒８が最
上位置に移動したときには（Ｓ１７：Ｙｅｓ）、カウン
ト値Ｉがクリアされる（Ｓ１８）。Further, when the count value ■ becomes N, that is, when the needle bar 8 moves to the uppermost position (S17: Yes), the count value I is cleared (S18).

尚、針板駆動機構１４は一例を示したものにすぎず、偏
心カムやクランク機構などで針板６を昇降させるように
するなど、種々の機構を用いて構成することも可能であ
る。The throat plate drive mechanism 14 is merely an example, and the needle plate drive mechanism 14 may be constructed using various mechanisms, such as an eccentric cam, a crank mechanism, or the like to move the throat plate 6 up and down.

尚、水平釜からなる上糸捕捉器を備えたミシン、天秤や
上糸捕捉器を独立に専用のステッピングモータで駆動す
るようにしたミシンなど種々のミシンに本発明を通用し
得ることは勿論である。It goes without saying that the present invention can be applied to various sewing machines, such as a sewing machine equipped with an upper thread catcher consisting of a horizontal hook, and a sewing machine in which the thread take-up and upper thread catcher are independently driven by a dedicated stepping motor. be.

【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９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図は要部を示すベツド部
の部分平面図、第４図は第３図ＩＶ−ＩＶ線断面図、第
５図はミシンの制御系のブロック図、第６図は割り込み
処理で実行される針棒制御のルーチンの概略フローチャ
ート、第７図は上糸初期ループ形成制御のルーチンの概
略フローチャート、第８図は針棒の上下運動を示すタイ
ムチャート、第９図は針板の下降運動で上糸初期ループ
が形成される作用を説明する作用説明図である。 ６・・針板、　８・・針棒、　　１０・・縫針、１２・
・送り歯、　１４・・針板駆動機構、２６・・上糸捕捉
器、　２６ａ・・剣先、　２９・・上糸、　３０・・針
棒駆動用ステッピングモータ、　３２・・針板駆動用ス
テッピングモータ、４２・・タイミング信号発生器、　
４５・・ＣＰＵ、　５０・・ＲＯＭ、５２・・プログラ
ムメモリ、　　６０・・ＲＡＭ、Ｃ・・制御装置。 特許出願人　　　ブラザー工業株式会社第 図 第 図 ／４ 第 図 第９図Figure 1 is a functional block diagram showing the configuration of the present invention, Figures 2-
Fig. 9 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 partial plan view of the bed section showing the main parts, and Fig. 4 is Fig. 3 IV. -IV line sectional view, Figure 5 is a block diagram of the control system of the sewing machine, Figure 6 is a schematic flowchart of the needle bar control routine executed in interrupt processing, and Figure 7 is the routine for controlling the initial loop formation of the upper thread. FIG. 8 is a schematic flowchart, FIG. 8 is a time chart showing the vertical movement of the needle bar, and FIG. 9 is an action explanatory diagram illustrating the action of forming an initial needle thread loop by the downward movement of the needle plate. 6. Throat plate, 8. Needle bar, 10. Sewing needle, 12.
・Feed dog, 14.. Throat plate drive mechanism, 26.. Upper thread catcher, 26a.. Tip, 29.. Upper thread, 30.. Stepping motor for driving the needle bar, 32.. Stepping motor for driving the throat plate. , 42...timing signal generator,
45...CPU, 50...ROM, 52...program memory, 60...RAM, C...control device. Patent applicant: Brother Industries, Ltd. Figure 4 Figure 9

Claims (1)

【特許請求の範囲】[Claims] （１）針板と、縫針が下端に取付けられた針棒と、針棒
の上下動に調時させて針棒を揺動させる針棒揺動駆動手
段と、上糸捕捉器とを備えたミシンにおいて、 針棒を独立に上下駆動する針棒上下駆動手段と、針棒上
下駆動手段を制御する第１制御手段と、前記針棒の上下
動に関連する位相信号を出力する位相検出手段と、 少なくとも針板上面が送り歯の上面より上方となる上昇
位置と針板上面が送り歯の上面より上方で且つ上昇位置
より所定小距離だけ低い下降位置とに移動可能な針板を
、昇降駆動する為の針板駆動手段と、 前記位相検出手段からの信号を受け、針棒を最下位置で
所定期間に亙って停止させるように第１制御手段に指令
するとともに、その針棒停止期間内で且つ上糸捕捉器の
剣先が縫針側の上糸に係合する前に針板を上昇位置から
下降位置に移動させるように針板駆動手段に指令する第
２制御手段とを備えたことを特徴とする電子制御式ジグ
ザグミシン。(1) Includes a throat plate, a needle bar with a sewing needle attached to the lower end, a needle bar swing drive means for swinging the needle bar in synchronization with the vertical movement of the needle bar, and an upper thread catcher. The sewing machine includes: a needle bar vertical drive means for independently driving the needle bar up and down; a first control means for controlling the needle bar vertical drive means; and a phase detection means for outputting a phase signal related to the vertical movement of the needle bar. , driving the throat plate up and down, which is movable to at least a raised position where the top surface of the throat plate is above the top surface of the feed dog and a lowered position where the top surface of the throat plate is above the top surface of the feed dog and is lower than the raised position by a predetermined short distance. a throat plate driving means for controlling the needle plate; and a first control means receiving a signal from the phase detecting means to instruct the first control means to stop the needle bar at the lowest position for a predetermined period of time, and to control the needle bar stopping period. and a second control means for instructing the throat plate driving means to move the throat plate from the raised position to the lowered position before the tip of the needle thread catcher engages with the needle thread on the sewing needle side. An electronically controlled zigzag sewing machine featuring