JP2849715B2 - Feed release sewing machine - Google Patents
Feed release sewing machineInfo
- Publication number
- JP2849715B2 JP2849715B2 JP63296131A JP29613188A JP2849715B2 JP 2849715 B2 JP2849715 B2 JP 2849715B2 JP 63296131 A JP63296131 A JP 63296131A JP 29613188 A JP29613188 A JP 29613188A JP 2849715 B2 JP2849715 B2 JP 2849715B2
- Authority
- JP
- Japan
- Prior art keywords
- needle
- presser
- drive shaft
- feed
- sewing machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Sewing Machines And Sewing (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は針糸捕捉手段の針糸解放後送り歯を針板上面
より下方位置に制御する制御手段を備えたミシンに関す
る。Description: TECHNICAL FIELD The present invention relates to a sewing machine having a control means for controlling a feed dog after releasing a needle thread of a needle thread catching means to a position below an upper surface of a needle plate.
（従来の技術及び発明が解決しようとする課題） 一般にミシンに加工布を着脱する場合には、針の上方
停止位置において、押え上げを操作して布押えを上方の
解放位置に上昇させて行われる。(Problems to be Solved by the Related Art and the Invention) Generally, when a work cloth is attached to or detached from the sewing machine, the presser foot is operated to raise the work clamp to the upper release position at the upper stop position of the needle. Will be
針の停止位置を制御する電子ミシンにおける制御位相
は、第８図に示す如くのミシン各部の運動曲線に基いて
定められる。図中横軸は針の上死点位相を零度とする駆
動軸の回転角を表す。縦軸は変位量を表すものであっ
て、縦軸の零は針板上面位置を示す。The control phase of the electronic sewing machine for controlling the stop position of the needle is determined based on the movement curves of the respective parts of the sewing machine as shown in FIG. The horizontal axis in the drawing represents the rotation angle of the drive shaft with the top dead center phase of the needle being zero degrees. The vertical axis indicates the amount of displacement, and zero on the vertical axis indicates the needle plate upper surface position.
Ａは針の先端の運動曲線であり、A0は針上死点、A1は
針下死点である。Ｂは送り歯上端の上下運動曲線であっ
て、B1は送り歯上端が上昇して針板上面と一致した送り
歯上昇開始位置、B2は送り歯上端が下降し針板上面に一
致した送り歯下降開始位置である。Ｃは天秤による上糸
供給量曲線であり、Ｄは釜上糸必要量曲線である。A is the movement curve of the tip of the needle, A0 is the needle top dead center, and A1 is the needle bottom dead center. B is the vertical movement curve of the upper end of the feed dog, B1 is the feed start position where the upper end of the feed dog rises and coincides with the upper surface of the needle plate, and B2 is the feed dog where the upper end of the feed dog lowers and coincides with the upper surface of the needle plate This is the descent start position. C is the curve of the amount of needle thread supplied by the balance, and D is the curve of the required amount of needle thread.
該釜上糸必要量曲線で明らかな如く、前記針の下死点
A1からの上昇時に針糸捕捉手段により針糸が捕捉される
位相はD1であり、該針糸が解放される位相はD2であっ
て、針上死点位相のA0の直前の位相である。The bottom dead center of the needle is clear
The phase at which the needle thread is captured by the needle thread capture means when ascending from A1 is D1, the phase at which the needle thread is released is D2, and is the phase immediately before A0 of the needle top dead center phase.
加工布の着脱のための上方停止位置は針糸の引き出し
のためには針糸捕捉手段による針糸の解放位相D2以降で
なければならないことから従来においては針上死点以降
となっている。In the related art, the upper stop position for attaching and detaching the work cloth must be after the needle thread release phase D2 by the needle thread catching means in order to pull out the needle thread.
この解放位相D2では図に明らかなように、送り歯は針
板よりも上方の略送り上昇位置であるため、押え上げに
より上昇した布押えの上昇量は送り歯の上昇分だけ少な
くなることになる。このため極めて厚い布を挿入する場
合は送り歯に干渉して実質的な押えリフトが減少する。
このため、特公昭63−46711号では押え上げの操作に連
動して従来のダニーリング位置に送り歯を針板上面から
下方の位置に沈下させる送り歯沈下装置が提案されてい
る。In this release phase D2, as is apparent from the figure, since the feed dog is located at approximately the feed raising position above the needle plate, the lift amount of the presser foot raised by the presser foot is reduced by the amount of the feed dog rise. Become. Therefore, when a very thick cloth is inserted, it interferes with the feed dog and a substantial presser lift is reduced.
For this reason, Japanese Patent Publication No. 63-46711 proposes a feed dog sinking device in which the feed dog is lowered from the upper surface of the needle plate to the conventional dunning position in conjunction with the presser lifting operation.
しかしながら、該提案の実施には押え上げと、送り歯
沈下装置と送り歯復帰装置とこれらの連結手段との大掛
かりな装置が必要である。However, the implementation of the proposal requires a large-scale device including a presser foot, a feed dog submerging device, a feed dog return device, and a connecting means for these devices.
このため本発明においては、従来のミシンに簡単な装
置を付加することによって針の上昇時における布の挿
入、取り出し時に送り歯を加工布に干渉しない位置に制
御するための装置を提供することを目的とする。Therefore, the present invention provides a device for controlling the feed dog to a position where it does not interfere with the work cloth when inserting and removing the cloth when the needle is raised by adding a simple device to the conventional sewing machine. Aim.
（課題を解決するための手段） このため本発明においては、駆動源に連結する駆動軸
に連結して上下動する針と該針と協働する針糸捕捉手段
と前記針の上下動と同期して駆動される天秤とでなる縫
目形成手段と、前記針の上下動と同期して上下動しかつ
前後動して布押えと協働して布送りする送り歯と、前記
駆動軸の回転位相を検出する駆動軸回転位相の検出手段
と、停止信号の発生に対して前記針糸捕捉手段から針糸
が解放された解放位相の検出信号の検出により前記駆動
軸を前記送り歯が針板の上面より下方に位置するまで逆
回転制御する制御手段とで構成する。(Means for Solving the Problems) Therefore, in the present invention, a needle that moves up and down by being connected to a drive shaft that is connected to a drive source, a needle thread catching means that cooperates with the needle, and synchronization of the needle that moves up and down A stitch forming means comprising a balance driven and driven, a feed dog which moves up and down in synchronization with the up and down movement of the needle and moves back and forth to feed the cloth in cooperation with the cloth presser, and A drive shaft rotation phase detecting means for detecting a rotation phase; and a detection signal of a release phase in which a needle thread is released from the needle thread catching means in response to generation of a stop signal. And control means for performing reverse rotation control until it is positioned below the upper surface of the plate.
尚、該逆回転制御を針糸捕捉手段から針糸が解放され
た以降の針の上位置停止時に前記布押えを上方の解放位
置に設定するための押え上げの解放操作を検出する検出
手段の検出信号により、逆回転制御する制御手段でも構
成可能である。Note that the reverse rotation control is performed by detecting means for detecting a release operation of a presser presser for setting the cloth presser to an upper release position when the needle upper position is stopped after the needle thread is released from the needle thread capturing means. Control means for performing reverse rotation control by a detection signal can also be configured.
（実施例） 次に本考案の実施例について図面を参照して詳細に説
明する。Embodiment Next, an embodiment of the present invention will be described in detail with reference to the drawings.
第２図は本考案のミシンの外観図であり、第３図の機
構説明図をも加えて説明する。第２図において、４は模
様選択手段であって、模様表示と模様番号とが表示され
ており、０〜９の数字キー５の操作により、所望の模様
を選択するものである。この選択された番号を模様表示
手段６に表示する。なお模様表示はLCDなどにより、模
様自体を表示するものであっても良い。FIG. 2 is an external view of the sewing machine of the present invention, which will be described with reference to the mechanism explanatory diagram of FIG. In FIG. 2, reference numeral 4 denotes a pattern selecting means on which a pattern display and a pattern number are displayed, and which selects a desired pattern by operating the numeric keys 5 of 0-9. The selected number is displayed on the pattern display means 6. The pattern display may be one that displays the pattern itself using an LCD or the like.
ミシン機枠１には駆動源（図示せず）に連結して回転
を伝達される駆動軸２が回転可能に支承されており、該
駆動軸に連結する針棒３が前記ミシン機枠１に上下動可
能に支承されている。該針棒３の先端に針17を固着して
いる。A drive shaft 2 that is connected to a drive source (not shown) and transmits rotation is rotatably supported on the sewing machine frame 1, and a needle bar 3 connected to the drive shaft is attached to the sewing machine frame 1. It is supported so that it can move up and down. A needle 17 is fixed to the tip of the needle bar 3.
第３図において、前記駆動軸２の軸端に設けたクラン
ク７の一端に針棒クランク８が固着しており、該針棒ク
ランクの軸部にクランクロッド９の一端が回転可能に嵌
装している。In FIG. 3, a needle bar crank 8 is fixed to one end of a crank 7 provided at the shaft end of the drive shaft 2, and one end of a crank rod 9 is rotatably fitted to the shaft of the needle bar crank. ing.
該クランクロッドの他端は前記針棒３を挿通する針棒
抱き10の軸部に回転可能に嵌装しており、前記針棒３は
前記針棒抱き10の上方と下方で針棒支持体11に上下動可
能に挿通している。The other end of the crank rod is rotatably fitted on a shaft of a needle bar holder 10 through which the needle bar 3 is inserted. The needle bar 3 is above and below the needle bar holder 10 and has a needle bar support. 11 is inserted vertically movably.
該針棒支持体は前記ミシン機枠１に固着の軸12に嵌装
し、上下動を規制されて回転方向のみ運動可能に支持さ
れている。The needle bar support is fitted on a shaft 12 fixed to the sewing machine frame 1, and is supported so as to be movable only in the rotation direction while being restricted from moving up and down.
前記針棒支持体11の前記針棒３と反対側には連結ロッ
ド13の一端が連結されており、該連結ロッドの他端は前
記ミシン機枠１に固着の針棒振幅用ステッピングモータ
14の出力軸14aに固着の腕15とリンク16を介して連結し
ている。One end of a connecting rod 13 is connected to a side of the needle bar support 11 opposite to the needle bar 3, and the other end of the connecting rod is connected to the needle bar amplitude stepping motor fixed to the sewing machine frame 1.
The output shaft 14a is connected to a fixed arm 15 and a link 16 via a link 16.
前記針棒３の下方の前記ミシン機枠１には前記針棒３
の先端に固着の針17が挿通するための針穴18aを有する
針板18が固着されている。The needle bar 3 is provided on the sewing machine frame 1 below the needle bar 3.
A needle plate 18 having a needle hole 18a through which a fixed needle 17 is inserted is fixed to the distal end of the needle plate 18.
19は送り歯であって、前記針板18に設けた送り歯溝18
bから出没して布押え20と協働してその間に保持する布
を前記針17の上下動に同期して移動せしめる。Reference numeral 19 denotes a feed dog, which is a feed dog groove 18 provided in the needle plate 18.
The cloth which appears and disappears from b and cooperates with the cloth presser 20 to move the cloth in synchronization with the vertical movement of the needle 17 is moved.
前記送り歯19は前記駆動軸２により駆動される水平送
り軸32に連結する送り台21に固着されており、該送り台
21の運動量の調節は前記送り軸32の揺動量を調節するこ
とにより行う。The feed dog 19 is fixed to a feed bar 21 connected to a horizontal feed shaft 32 driven by the drive shaft 2.
The adjustment of the momentum 21 is performed by adjusting the swing amount of the feed shaft 32.
22は送り調節器であって、前記ミシン機枠１に回転可
能に支承される送り調節軸23の軸端に固着されており、
該送り調節軸を回転することにより、前記送り調節器22
の角度を変えて送り量を調節する。Reference numeral 22 denotes a feed adjuster, which is fixed to a shaft end of a feed adjustment shaft 23 rotatably supported on the sewing machine frame 1,
By rotating the feed adjusting shaft, the feed adjuster 22 is rotated.
Adjust the feed amount by changing the angle of.
即ち前記駆動軸２に連結して前記ミシン機枠１に回転
可能に支承される下軸29に固着される偏心カムである水
平送りカム45で発生する前後送り運動の運動量の伝達量
を調節するものである。That is, the transmission amount of the forward and backward movement generated by the horizontal feed cam 45 which is an eccentric cam fixed to the lower shaft 29 which is connected to the drive shaft 2 and rotatably supported on the sewing machine frame 1 is adjusted. Things.
前記送り調節軸23の他端には腕24が固着されており、
該腕と前記ミシン機枠１に固着の送り調節用ステッピン
グモータ25の出力軸に固着の腕26とがリンク27を介して
連結している。An arm 24 is fixed to the other end of the feed adjusting shaft 23,
The arm and an arm 26 fixed to the output shaft of a feed adjusting stepping motor 25 fixed to the sewing machine frame 1 are connected via a link 27.
28は針糸捕捉手段である釜であって、前記針板18の下
方で前記ミシン機枠１に回転可能に支承され、前記駆動
軸２に連結して前記針17の上下動と同期して回転する前
記下軸29に固着の歯車30と前記釜28の下部に一体的に固
着の釜の歯車31とが噛合して回転を伝達されている。Reference numeral 28 denotes a shuttle as a needle thread catching means, which is rotatably supported by the sewing machine frame 1 below the needle plate 18 and connected to the drive shaft 2 to synchronize with the vertical movement of the needle 17. A gear 30 fixed to the rotating lower shaft 29 and a gear 31 of the shuttle integrally fixed to the lower part of the shuttle 28 are engaged to transmit rotation.
79は駆動軸位相の検出手段であって、第６図に示す如
く前記駆動軸２に固着の回転板80と前記ミシン機枠１に
固着のフォトインタラプタ81とにより構成されている。Numeral 79 denotes a drive shaft phase detecting means, which comprises a rotary plate 80 fixed to the drive shaft 2 and a photo interrupter 81 fixed to the sewing machine frame 1 as shown in FIG.
前記駆動軸位相の検出手段79による位相検出について
は先に本出願人が出願した特開昭55−73288号と同一で
あるので説明は省略する。The phase detection by the drive shaft phase detecting means 79 is the same as that described in Japanese Patent Application Laid-Open No. 55-73288 filed by the present applicant, and the description thereof is omitted.
63は公知の天秤であって、前記クランク７に連結して
前記針の上下動に調時して上下動する如く構成されてい
る。Reference numeral 63 denotes a known balance, which is connected to the crank 7 so as to move up and down in synchronization with the up and down movement of the needle.
前記送り歯19の送り機構について説明する。 The feed mechanism of the feed dog 19 will be described.
前記水平送り軸32は前記ミシン機枠１に螺合する一対
のテーパーネジ33、34により回動自在に支持されてお
り、該水平送り軸の両端に腕部32a,32bが形成されてい
る。The horizontal feed shaft 32 is rotatably supported by a pair of tapered screws 33 and 34 screwed to the sewing machine frame 1. Arms 32a and 32b are formed at both ends of the horizontal feed shaft.
該腕部の先端にピン39,40がネジ37,38により前記水平
送り軸32と平行に固着されている。Pins 39 and 40 are fixed to the ends of the arms in parallel with the horizontal feed shaft 32 by screws 37 and 38.
前記ピン39,40に前記送り台21が回転可能で又ピン39,
40の軸方向に移動可能に嵌装している。前記送り第21は
該下部21aが前記下軸29に固着される偏心カムである上
下送りカム41上に配置され、バネ手段（図示せず）によ
り常には該上下送りカムに当接従動し、上下運動させら
れる。The feed bar 21 is rotatable around the pins 39, 40 and the pins 39, 40
It is fitted so as to be movable in 40 axial directions. The feed 21 is disposed on a vertical feed cam 41 which is an eccentric cam whose lower part 21a is fixed to the lower shaft 29, and is always in contact with and driven by the vertical feed cam by a spring means (not shown). Moved up and down.
前記水平送り軸32の揺動中心と腕部先端との中間部に
はピン43が固着されており、該ピンに送り二又44の一端
が回転可能に嵌合している。A pin 43 is fixed to an intermediate portion between the swing center of the horizontal feed shaft 32 and the tip of the arm, and one end of a feed fork 44 is rotatably fitted to the pin.
該送り二又の二又部は前記下軸29に固着される偏心カ
ムである送りカム45のカム外周に嵌合しており、前記二
又部の一方にピン46が固着されている。該ピンに角ゴマ
47が嵌合しており、該角ゴマが前記送り調節器22の調節
溝22aに嵌合している。The bifurcated portion of the feed bifurcation is fitted on the outer periphery of a feed cam 45 which is an eccentric cam fixed to the lower shaft 29, and a pin 46 is fixed to one of the bifurcated portions. Square sesame on the pin
47 is fitted, and the square sesame is fitted in the adjusting groove 22a of the feed adjuster 22.
前記送り二又44は前記送り調節器22の傾斜に応じて前
記水平送り軸32を前記一対のテーパネジ33,34を中心に
揺動させて、前記送り台21を前後運動させる。The feed fork 44 swings the horizontal feed shaft 32 about the pair of tapered screws 33 and 34 in accordance with the inclination of the feed adjuster 22 to move the feed table 21 back and forth.
次に押え上げの上方解放位置の検出装置について第４
図を参照して説明する。Next, the fourth device for detecting the upper release position of the presser foot will be described.
This will be described with reference to the drawings.
48は押え棒であって前記ミシン機枠１に上下動可能に
支承されており、先端に前記布押20を装着している。49
は押え棒抱きであって、前記押え棒に嵌装固着されてお
り、前記ミシン機枠１とのあいだに配設した押えバネ50
の付勢により常には前記押え棒抱き49を介して前記押え
棒48を下方に押圧して前記布押え20と前記送り歯19との
間に挟持力を発生している。Reference numeral 48 denotes a presser bar, which is supported by the sewing machine frame 1 so as to be movable up and down, and the cloth presser 20 is attached to the end thereof. 49
Is a presser bar holder, which is fitted and fixed to the presser bar, and is provided with a presser spring 50 disposed between the presser bar and the sewing machine frame 1.
The urging force always presses down the presser bar 48 via the presser bar clamp 49 to generate a clamping force between the cloth presser 20 and the feed dog 19.
59は押え上げであって、前記ミシン機枠１に固着の段
ネジ60の段部に回転可能に嵌装しており、操作により前
記押え棒抱き49に当接して前記押えバネ50の付勢に抗し
て上昇して解放位置に設定される如く構成されている。Numeral 59 denotes a presser lift, which is rotatably fitted to a step portion of a step screw 60 fixed to the sewing machine frame 1, and which comes into contact with the presser bar holder 49 by operation to bias the presser spring 50. And set to the release position.
51は押え上げ位置検出手段としてのマイクロスイッチ
であって、前記ミシン機枠１に固着されており、検出子
の先端は前記押え棒抱き49の上面に配置されている。Reference numeral 51 denotes a microswitch as a presser-lifting position detecting means, which is fixed to the sewing machine frame 1, and the tip of a detector is disposed on the upper surface of the presser bar holder 49.
前記押え上げ位置検出手段51は前記押え棒抱き49の上
方解放位置設定時に該押え棒抱きの上面と前記検出子と
が当接して押え上げ操作の検出信号を出力する如く構成
されている。The presser-lifting position detecting means 51 is configured such that when the upper release position of the presser-bar holder 49 is set, the upper surface of the presser-bar holder comes into contact with the detector to output a detection signal of the lifting operation.
次に制御装置について第１図を参照して説明する。 Next, the control device will be described with reference to FIG.
前記模様選択手段４及び前記押え上げ位置検出手段5
1、前記駆動軸回転位相検出手段79、前記模様表示手段
６は中央演算装置52に接続されている。The pattern selecting means 4 and the presser lifting position detecting means 5
1. The drive shaft rotation phase detection means 79 and the pattern display means 6 are connected to a central processing unit 52.
53は選択模様記憶手段であって、前記模様選択手段４
によって選択された模様を記憶するものであり、前記中
央演算装置52に接続されている。53 is a selected pattern storage means,
And stores the selected pattern, and is connected to the central processing unit 52.
54は模様データ記憶手段であって、前記模様選択手段
４によって選択可能な模様の縫目データと模様の表示デ
ータとを記憶して前記中央演算装置52に接続されてい
る。Reference numeral 54 denotes a pattern data storage means, which stores the stitch data of the pattern and the display data of the pattern which can be selected by the pattern selection means 4 and is connected to the central processing unit 52.
55は制御データ記憶手段であって、前記針糸捕捉手段
28の解放位相データ、針上死点位相データ、逆回転停止
位相データを記憶しており、前記中央演算装置52に接続
されている。55 is control data storage means, and said needle thread catching means
It stores 28 release phase data, needle top dead center phase data, and reverse rotation stop phase data, and is connected to the central processing unit 52.
前記針棒振幅用ステッピングモータ14と前記送り調節
用ステッピングモータ25はステッピングモータ駆動回路
56を介して前記中央演算装置52に接続されている。The needle bar amplitude stepping motor 14 and the feed adjustment stepping motor 25 are a stepping motor drive circuit.
It is connected to the central processing unit 52 via 56.
57は駆動源であるミシンモータであって、本実施例で
は細かい制御が容易なDCサーボモータを用いており、該
モータはモータ駆動回路58を介して前記中央演算装置52
に接続されている。Reference numeral 57 denotes a sewing machine motor serving as a drive source.In this embodiment, a DC servo motor that can be easily controlled is used. The motor is connected to the central processing unit 52 via a motor drive circuit 58.
It is connected to the.
次に本発明のミシンの動作について第５図の流れ図を
参照して説明する。Next, the operation of the sewing machine of the present invention will be described with reference to the flowchart of FIG.
前記模様選択手段４の数字キー５を操作して所望の模
様を選択するが、布の挿入するためには（ａ）のステッ
プで前記駆動軸２が停止中か否かを判別する。The desired pattern is selected by operating the numerical keys 5 of the pattern selecting means 4. To insert a cloth, it is determined in step (a) whether or not the drive shaft 2 is stopped.
停止中でなく回転中であれば（ｂ）のステップで前記
ミシンモータ57を停止する。If the machine is not stopped but rotating, the sewing machine motor 57 is stopped in step (b).
次に（ｃ）のステップで前記押え上げが操作されたか
否かを判別する。Next, in the step (c), it is determined whether or not the presser foot is operated.
布を前記布押え20と前記針板18との間に挿入するため
前記押え上げ59を操作して前記押えバネ50の付勢に抗し
て上昇して前記押え棒48を解放位置に設定する。In order to insert the cloth between the cloth presser 20 and the needle plate 18, the presser lift 59 is operated to ascend against the bias of the presser spring 50 to set the presser bar 48 to the release position. .
該押え棒に固着の前記押え棒抱き49の上昇により、前
記押え上げ位置検出手段51は押え上げ位置検出信号を出
力する。When the presser bar clamp 49 fixed to the presser bar rises, the presser lift position detecting means 51 outputs a presser lift position detection signal.
該検出信号に対して次の（ｄ）のステップで停止位置
が前記駆動軸回転位相検出手段79により検出している位
相が前記針糸捕捉手段28から針糸が解放された後の位相
の針上方位置であるか否かを判別する。In response to the detection signal, in the next step (d), the phase at which the stop position is detected by the drive shaft rotation phase detection means 79 is the needle of the phase after the needle thread is released from the needle thread capture means 28. It is determined whether or not it is at the upper position.
解放前の位相及び針上方位置でない場合は（ｅ）のス
テップで解放後の針上方位相、第８図中A0以外では針上
死点位相に前記ミシンモータ57を駆動する。If the phase is not the pre-release phase or the needle upper position, the sewing machine motor 57 is driven to the needle upper phase after release in step (e), or to the needle top dead center phase except for A0 in FIG.
針上死点位相であれば（ｆ）のステップで、前記ミシ
ンモータ57を縫目形成のための回転方向とは逆の方向に
回転して、前記針17が上方であって前記送り歯19の上端
が前記針板18から没する位相、第８図ではB1以前の位相
に制御する。If it is the needle top dead center phase, in step (f), the sewing machine motor 57 is rotated in the direction opposite to the rotation direction for forming the stitch, 8 is controlled to a phase in which the upper end of the needle sinks from the needle plate 18, that is, a phase before B1 in FIG.
前記布押え20の押え上げの操作による上昇位置は該上
昇位置において前記針17が下降した時に該針を保持する
針止め61の下端と前記布押え20の上端とが干渉しない位
置として一般的には最大で10ミリ程度に設定されてい
る。The raised position by the operation of lifting the presser foot 20 is generally defined as a position where the lower end of the needle stopper 61 holding the needle and the upper end of the presser foot 20 do not interfere with each other when the needle 17 is lowered at the raised position. Is set to about 10 mm at the maximum.
前記制御位相では前記針17の先端は前記針板18の上方
略14ミリ（A3）の位置であって、前記布押え20の下端よ
り充分上方の位置である。In the control phase, the tip of the needle 17 is located approximately 14 mm (A3) above the needle plate 18 and sufficiently above the lower end of the presser foot 20.
同時に前記送り歯19は前記針板18から没しており、布
の挿入に何ら支障のない状態である。At the same time, the feed dog 19 is submerged from the needle plate 18, so that the insertion of the cloth is not hindered at all.
又縫製終了後の布の取り出しについても同様の制御が
実行されるので、針糸の引き出しに支障なく前記送り歯
19の先端の影響を受けない状態が設定される。Also, the same control is performed for taking out the cloth after the sewing is completed, so that the feed dog can be withdrawn without any trouble in drawing out the needle thread.
A state not affected by the 19 tips is set.
尚、本実施例では制御位相を前記送り歯19が前記針板
18から下方に没した位相としたが、布の引き出しに影響
を与えない程度に前記針板18の上面上に残留するもので
あっても良い。In the present embodiment, the control phase is controlled by the feed dog 19 by the needle plate.
Although the phase is sunk downward from 18, the phase may be left on the upper surface of the needle plate 18 so as not to affect the pulling out of the cloth.
尚、本実施例では前記針糸捕捉手段28からの針糸解放
後のミシン停止時に前記押え上げ59の操作により、前記
駆動軸２を逆回転制御するものを示したが、前記押え上
げ59の操作に拘らず回転中の停止信号の発生に対して常
に前記駆動軸２の停止位相を針上方の針糸解放後の位置
に到達後、前記送り歯19が前記針板18の上面から没する
位相まで逆回転するものであっても良い。In this embodiment, when the sewing machine is stopped after the release of the needle thread from the needle thread catching means 28, the operation of the presser lift 59 is performed to control the reverse rotation of the drive shaft 2; After the stop phase of the drive shaft 2 reaches the position after the release of the needle thread above the needle, the feed dog 19 sinks from the upper surface of the needle plate 18 in response to the generation of the stop signal during rotation regardless of the operation. The rotation may be reverse to the phase.
又前記送り歯19が前記針板18の上面から没する位相で
前記押え上げ59を操作して糸調子器61（第７図参照）を
解放して針糸を緩めて取り出し、糸切断後に新たな布を
挿入し、前記押え上げ59を操作して布を前記布押え20の
下に保持すると前記糸調子器61が復帰して針糸を保持す
る。Further, at the phase in which the feed dog 19 sinks from the upper surface of the needle plate 18, the presser lifter 59 is operated to release the thread tensioner 61 (see FIG. 7) to loosen and take out the needle thread. When a suitable cloth is inserted and the presser lift 59 is operated to hold the cloth under the cloth presser 20, the thread tension controller 61 returns to hold the needle thread.
この時前記天秤63は下方位置にある。ミシンの始動で
該天秤の上昇により切断側の針糸が針から糸抜けする対
応については、第７図に示す如く、前記天秤63と前記糸
調子器61との間に前記押え上げ59の操作に連動して前記
糸調子器61を解放する糸ユルメレバー62に糸繰り出しレ
バー部62aを一体的に形成して糸ゆるめ時に針糸を予め
引き出すことで糸抜けを防止する。At this time, the balance 63 is at the lower position. As shown in FIG. 7, when the sewing machine is started, the needle thread on the cutting side is pulled out of the needle by raising the balance. As shown in FIG. 7, the operation of the presser lift 59 between the balance 63 and the thread tensioner 61 is performed. A yarn feeding lever portion 62a is formed integrally with a yarn urme lever 62 that releases the yarn tensioner 61 in conjunction with the operation of the yarn tensioner 61, and the needle yarn is pulled out in advance when the yarn is loosened, thereby preventing the yarn from coming off.
又前記糸繰り出しレバー部62aに替えて、針糸を供給
する公知の針糸供給装置を前記天秤63と針糸供給源との
間に配置して作動させるものであってもよい。Instead of the thread feeding lever 62a, a known needle thread supply device for supplying a needle thread may be arranged and operated between the balance 63 and the needle thread supply source.
（発明の効果） 以上の如く本発明によれば、布の引き出しに必要な針
糸解放位相到達後に駆動軸を逆転することにより針は上
昇時の布押えの下面より充分上方であって送り歯の上端
は布の着脱に支障のない位置に下降した位置となるの
で、布押えと針板との間への布の挿入、取り出しが大掛
かりな装置を設けることなく行うことが出来る。(Effects of the Invention) As described above, according to the present invention, the needle is sufficiently above the lower surface of the cloth presser at the time of ascending by reversing the drive shaft after the needle thread release phase required for pulling out the cloth has been reached. The upper end is located at a position where it does not hinder the attachment and detachment of the cloth, so that the insertion and removal of the cloth between the cloth presser and the needle plate can be performed without providing a large-scale device.
図面は本発明の実施例に係り、第１図は制御ブロック
図、第２図はミシンの外観図、第３図はミシンの機構説
明図、第４図は押え上げ検出手段の説明図、第５図は動
作説明の流れ図、第６図は駆動軸位相の検出手段の説明
図、第７図は糸繰り出しレバーの説明図、第８図はミシ
ン各部の運動曲線の説明図であり、57は駆動源のミシン
モータ、２は駆動軸、17は針、28は針糸捕捉手段である
釜、20は布押え、19は送り歯、51は押え上げ検出手段の
マイクロスイッチ、52の中央演算装置と57のモータ駆動
回路は制御手段である。1 is a control block diagram, FIG. 2 is an external view of a sewing machine, FIG. 3 is an explanatory view of a mechanism of the sewing machine, FIG. 4 is an explanatory view of a presser lifting detecting means, FIG. 5 is a flowchart for explaining the operation, FIG. 6 is an explanatory diagram of a drive shaft phase detecting means, FIG. 7 is an explanatory diagram of a thread payout lever, FIG. 8 is an explanatory diagram of a motion curve of each part of the sewing machine, and 57 is A sewing machine motor as a drive source, 2 is a drive shaft, 17 is a needle, 28 is a shuttle which is a needle thread catching means, 20 is a cloth presser, 19 is a feed dog, 51 is a micro switch of press-up detecting means, and 52 is a central processing unit And 57 are the control means.
Claims (2)
する針と該針と協働する針糸捕捉手段と前記針の上下動
と同期して駆動される天秤とでなる縫目形成手段と、前
記針の上下動と同期して上下動しかつ前後動して布押え
と協働して布送りする送り歯と、前記駆動軸の回転位相
を検出する駆動軸回転位相の検出手段と、停止信号の発
生に対して前記針糸捕捉手段から針糸が解放されるまで
ミシンを回転制御し、前記駆動軸回転位相の検出手段が
解放位相を検出した検出信号により前記駆動軸を前記針
が布押さえより上方位置であって前記送り歯が針板の上
面より下方に位置するまで逆回転制御する制御手段とで
なる送り解放ミシン。1. A stitch comprising a needle connected to a drive shaft connected to a drive source and moving up and down, a needle thread catching means cooperating with the needle, and a balance driven in synchronization with the vertical movement of the needle. Forming means, a feed dog which moves up and down in synchronism with the up and down movement of the needle and moves back and forth to feed the cloth in cooperation with the cloth presser, and detection of a drive shaft rotation phase for detecting a rotation phase of the drive shaft Means for controlling the rotation of the sewing machine until the needle thread is released from the needle thread catching means in response to the generation of the stop signal, and the drive shaft rotation phase detecting means detects the release phase by using the detection signal to detect the release phase. A feed release sewing machine comprising control means for performing reverse rotation control until the needle is positioned above the cloth presser and the feed dog is positioned below the upper surface of the needle plate.
する針と該針と協働する針糸捕捉手段と前記針の上下動
と同期して駆動される天秤とでなる縫目形成手段と、前
記針の上下動と同期して上下動しかつ前後動して布押え
と協働して布送りする送り歯と、前記布押えを上方の解
放位置に設定するための押え上げと、該押え上げの解放
位置を検出する押え上げ位置検出手段と、前記駆動軸の
回転位相を検出する駆動軸回転位相の検出手段と、前記
押え上げ位置検出手段の前記押え上げ解放位置の検出信
号に対して、前記針糸捕捉手段から針糸が解放されるま
でミシンを回転制御し、前記駆動軸回転位相の検出手段
が解放位相を検出した検出信号により前記駆動軸を前記
針が布押さえより上方位置であって前記送り歯が針板の
上面より下方に位置するまで逆回転制御する制御手段と
でなる送り解放ミシン。2. A stitch comprising a needle connected to a drive shaft connected to a drive source and moving up and down, needle thread catching means cooperating with the needle, and a balance driven in synchronization with the vertical movement of the needle. Forming means, a feed dog which moves up and down in synchronism with the up and down movement of the needle and moves back and forth to feed the cloth in cooperation with the cloth presser, and a presser foot for setting the cloth presser to an upper release position Presser lift position detecting means for detecting the release position of the presser lift, drive shaft rotational phase detecting means for detecting the rotational phase of the drive shaft, and detection of the presser lift release position of the presser lift position detecting means. In response to the signal, the sewing machine controls the rotation of the sewing machine until the needle thread is released from the needle thread capturing means, and the needle presses the drive shaft with the detection signal that the drive shaft rotation phase detecting means detects the release phase. Above the needle and the feed dog is positioned below the upper surface of the needle plate. Feed release sewing machine comprising in the reverse rotation control to the control means until.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63296131A JP2849715B2 (en) | 1988-11-25 | 1988-11-25 | Feed release sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63296131A JP2849715B2 (en) | 1988-11-25 | 1988-11-25 | Feed release sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02142595A JPH02142595A (en) | 1990-05-31 |
| JP2849715B2 true JP2849715B2 (en) | 1999-01-27 |
Family
ID=17829545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63296131A Expired - Fee Related JP2849715B2 (en) | 1988-11-25 | 1988-11-25 | Feed release sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2849715B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4753159B2 (en) * | 2006-03-17 | 2011-08-24 | ブラザー工業株式会社 | sewing machine |
| CN111607911A (en) * | 2019-02-26 | 2020-09-01 | 杰克缝纫机股份有限公司 | Sewing machine and automatic device of dodging of pay-off tooth thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6346711A (en) * | 1986-08-14 | 1988-02-27 | Toshiba Corp | On-load tap changing transformer |
| JPS63267395A (en) * | 1987-04-23 | 1988-11-04 | ジューキ株式会社 | Reversible sewing machine |
-
1988
- 1988-11-25 JP JP63296131A patent/JP2849715B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02142595A (en) | 1990-05-31 |
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