JPH0230279B2 - - Google Patents
Info
- Publication number
- JPH0230279B2 JPH0230279B2 JP60067565A JP6756585A JPH0230279B2 JP H0230279 B2 JPH0230279 B2 JP H0230279B2 JP 60067565 A JP60067565 A JP 60067565A JP 6756585 A JP6756585 A JP 6756585A JP H0230279 B2 JPH0230279 B2 JP H0230279B2
- Authority
- JP
- Japan
- Prior art keywords
- feed
- feed amount
- stepping motor
- control
- predetermined
- 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 - Lifetime
Links
- 239000004744 fabric Substances 0.000 claims description 17
- 238000009958 sewing Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 1
Landscapes
- Sewing Machines And Sewing (AREA)
Description
〔産業上の利用分野〕
この発明は、ステツピングモータにより、布送
り量を制御する布送り量制御装置に関する。
〔従来の技術〕
従来この種のミシンでは第５図に示すように、
布送り量が中心からの径長として全周に形成され
たカム溝１を有する送りカム２を送り用のステツ
ピングモータ（STM）３に螺着し、このカム溝
１に接触子アーム５の接触子６を該溝１内で摺動
可能に嵌合し、ステツピングモータ３により、送
りカム２を回動し、カム溝１の径の変位を布送り
量の変化として送り調整器７に伝達している。こ
れにより、周知の送り機構８を介して送り歯９の
正送りおよび逆送りにおける布送り量を等しく設
定し、返し縫いにおける１針目からの縫い目の長
さが正送りにおける縫い目の長さと等しくすると
ともに、正逆送り時の針落点を同じにして縫い目
を揃えるようにしている。
〔発明が解決しようとする問題点〕
ところで、従来の布送り量制御装置は、上記の
ように縫い目の長さと針落点を等しくするため
に、高速正送り時のように、針の上下動が高速で
行なわれているときに、返し縫いスイツチがON
されると、この返し縫いスイツチのON直後の送
り方向変換期間に、ステツピングモータを回転さ
せて、逆送り時の布送り量を設定するために周波
数応答性のよいステツピングモータを用いる必要
があつた。
しかしながら、逆送りはほつれを防止するため
に布端などの縫い目の目立たない個所で少ない針
数により行なわれるのであるから、高速正送りか
ら逆送りに切換える場合にも周波数応答性のよい
ステツピングモータを用いて、縫い目の長さと針
落点を等しくして縫い目を揃えようとすることは
意味のないことである。しかも、このような動作
に用いる周波数応答性の高いステツピングモータ
は高価であり、ミシンのコストを上げる一因とな
つていた。
このため、この発明は、低応答性のステツピン
グモータを用い、しかも、このステツピングモー
タを送り方向変更期間ごとに、逆送りにおける布
送り量を設定するために回転すべき回転角、すな
わち設定回転角より小さい回転角で、最大回転角
になるまで、順次、回転させるようにして逆送り
の最初の２、３針を正送りのときの縫い目より短
くし問題点を解決しようとしている。
〔問題点を解決するための手段〕
布送り機構に連結し移動位置に関連して布送り
機構を所定の正方向送り量から所定の逆方向送り
量の間に設定可能とした送り設定機構と、ステツ
プ角の変位に従い上記両送り量の間に設定するよ
うに送り設定機構を移動可能に連結したステツピ
ングモータと、ミシン主軸に関連配置しステツピ
ングモータの駆動タイミングを設定するための位
相パルスを発生する位置検出手段、位相パルスに
関連してステツピングモータに対し所定回転角を
与える駆動パルスを付与する駆動回路とを有し、
位相パルス発生時に所定数の駆動パルスでステツ
ピングモータを駆動して設定送り量に設定するミ
シンにおいて、操作により返し縫いを指令する信
号を発生するスイツチ１と、上記指令信号により
作用しミシンの駆動速度を所定の低速に設定する
速度設定回路と、上記所定の低速を検出して検出
信号を発生する速度検出回路と、指令信号発生前
の正送り量に対応したステツプ角から所望逆送り
量に対応したステツプ角までの所定の駆動パルス
数を複数の位相パルス毎に分割して発生する第一
の制御及び上記所定の駆動パルス数を単一の位相
パルスに発生する第二の制御とを選択的に可能と
した制御回路と、指令信号に関連して検出信号の
有無を判断し第一の制御または第二の制御の一方
を選択する選択回路とをもうけたものである。
〔実施例〕
この発明の一実施例を第１図ないし第４図を用
いて説明する。第１図において、１は返し縫いス
イツチで、一方の端子を抵抗２を介して直流電源
に接続するとともに他方の端子をアースしてい
る。したがつて、このスイツチ１がOFFのとき
はハイレベル（Ｈ）信号が、ONのときはローレ
ベル（Ｌ）信号が、インバータ３でレベルが反転
後、判断手段および制御手段としてのマイクロコ
ンピータ４に入力される。５は針板面に対する針
の上下位置を検出する針上／下位置検出器、６は
ステツピングモータ駆動回路で、布送り量設定用
のステツピングモータ７を回転制御している。８
は速度制御回路で、スライドボリユーム（図示せ
ず）からの設定回転数すなわち速度設定電圧と、
ミシンモータ９の回転数に比例したタコゼネ１０
からの出力電圧とを比較し、比較した結果得られ
る差電圧に応じてミシンモータ駆動回路１１を介
して前記ミシンモータ９を駆動制御している。ま
た、前記マイクロコンピータ４からの回転指令信
号および低速指令信号等に基づき前記ミシンモー
タ駆動回路１１を介してミシンモータ９を駆動制
御している。
[Industrial Application Field] The present invention relates to a cloth feed amount control device that controls the cloth feed amount using a stepping motor. [Prior Art] Conventionally, this type of sewing machine has the following steps as shown in Fig. 5:
A feed cam 2 having a cam groove 1 formed around the entire circumference with the cloth feed amount as the radial length from the center is screwed onto a stepping motor (STM) 3 for feeding. The contactor 6 is slidably fitted in the groove 1, the stepping motor 3 rotates the feed cam 2, and the displacement of the diameter of the cam groove 1 is transmitted to the feed adjuster 7 as a change in the cloth feed amount. Communicating. As a result, the feed amount of the feed dog 9 in normal feed and reverse feed is set equally through the well-known feed mechanism 8, and the length of the stitch from the first stitch in reverse stitch is made equal to the length of the stitch in normal feed. , the needle drop points during forward and reverse feed are made the same to align the stitches. [Problems to be Solved by the Invention] By the way, in order to equalize the stitch length and needle drop point as described above, the conventional cloth feed amount control device does not control the vertical movement of the needle, as in the case of high-speed normal feed. is being performed at high speed, the reverse stitch switch is turned ON.
In this case, it is necessary to use a stepping motor with good frequency response in order to rotate the stepping motor during the feed direction change period immediately after turning on the reverse stitch switch and set the amount of cloth feed during reverse feed. Ta. However, in order to prevent fraying, reverse feed is performed with a small number of stitches at inconspicuous locations such as edges of the fabric, so a stepping motor with good frequency response is also used when switching from high-speed normal feed to reverse feed. It is meaningless to try to align the stitches by making the stitch length and needle drop point the same using . Furthermore, stepping motors with high frequency response used for such operations are expensive, contributing to an increase in the cost of sewing machines. For this reason, the present invention uses a stepping motor with low responsiveness, and also sets the rotation angle at which this stepping motor should be rotated in order to set the cloth feed amount in reverse feed every time the feeding direction is changed. The problem is solved by sequentially rotating the sewing machine at a rotation angle smaller than the rotation angle until the maximum rotation angle is reached, thereby making the first two or three stitches in reverse feed shorter than the stitches in normal feed. [Means for solving the problem] A feed setting mechanism that is connected to a cloth feed mechanism and can set the cloth feed mechanism between a predetermined forward feed amount and a predetermined reverse feed amount in relation to the movement position. , a stepping motor to which a feed setting mechanism is movably connected so as to set the feed amount between the above two feed amounts according to the displacement of the step angle, and a phase pulse arranged in relation to the main shaft of the sewing machine to set the drive timing of the stepping motor. and a drive circuit that applies a drive pulse that gives a predetermined rotation angle to the stepping motor in relation to the phase pulse,
In a sewing machine that drives a stepping motor with a predetermined number of drive pulses when a phase pulse is generated to set a set feed amount, there is a switch 1 that generates a signal to command reverse stitching when operated, and a switch 1 that operates according to the command signal to control the driving speed of the sewing machine. A speed setting circuit that sets the speed to a predetermined low speed, a speed detection circuit that detects the predetermined low speed and generates a detection signal, and a step angle that corresponds to the forward feed amount before the command signal is generated to correspond to the desired reverse feed amount. A first control that generates a predetermined number of drive pulses up to a step angle divided into a plurality of phase pulses, and a second control that generates the predetermined number of drive pulses as a single phase pulse. The control circuit is provided with a control circuit that enables the control signal to be controlled, and a selection circuit that determines the presence or absence of a detection signal in relation to the command signal and selects either the first control or the second control. [Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 4. In FIG. 1, 1 is a reverse stitching switch, one terminal of which is connected to a DC power source via a resistor 2, and the other terminal is grounded. Therefore, when this switch 1 is OFF, a high level (H) signal is generated, and when it is ON, a low level (L) signal is generated. is input. Numeral 5 is a needle upper/lower position detector for detecting the vertical position of the needle with respect to the throat plate surface, and 6 is a stepping motor drive circuit which rotationally controls the stepping motor 7 for setting the cloth feed amount. 8
is a speed control circuit, which controls the set rotation speed from a slide volume (not shown), that is, the speed setting voltage,
Tachogenerator 10 proportional to the rotation speed of sewing machine motor 9
The sewing machine motor 9 is driven and controlled via the sewing machine motor drive circuit 11 in accordance with the difference voltage obtained as a result of the comparison. Further, the sewing machine motor 9 is driven and controlled via the sewing machine motor drive circuit 11 based on a rotation command signal, a low speed command signal, etc. from the microcomputer 4.
【表】【table】
この発明は、以上説明したようにステツピング
モータを、送り方向変更期間ごとに、逆送り時に
おける布送り量を設定するために回転すべき回転
を複数のこれより小さい回転角に分割し、分割し
た回転角に応じて最大回転角になるまで順次回転
させるようにしたため、周波数応答性の低いステ
ツピングモータを使用しても、高応答性を有する
ステツピングモータを使用した場合と同様に糸ほ
つれ防止のための返し縫いをできるという効果が
ある。
As explained above, this invention divides the rotation of the stepping motor into a plurality of smaller rotation angles in order to set the amount of cloth feed during reverse feed for each feed direction change period. Since the rotation angle is sequentially rotated until the maximum rotation angle is reached according to the rotation angle set, even if a stepping motor with low frequency response is used, thread fraying will not occur in the same way as when using a stepping motor with high response. This has the effect of being able to backstitch to prevent this.
第１図はこの発明の一実施例を示す回路図、第
２図はタイムチヤートであり、ａは針棒曲線、ｂ
〜ｈはそれぞれ第１図の各部における波形図を示
す図、。第３図は本実施例の動作フローチヤート、
第４図はステツピングモータの駆動サブルーチン
を示すフローチヤート、第５図は布送り量設定機
構の要部を示す正面図である。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a time chart, where a is a needle bar curve and b is a time chart.
~h are diagrams showing waveform diagrams at respective parts of FIG. 1, respectively. FIG. 3 is an operational flowchart of this embodiment.
FIG. 4 is a flowchart showing a subroutine for driving the stepping motor, and FIG. 5 is a front view showing the main parts of the cloth feed amount setting mechanism.
Claims (1)
り機構を所定の正方向送り量から所定の逆方向送
り量の間に設定可能とした送り設定機構と、 ステツプ角の変位に従い上記両送り量の間に設
定するように送り設定機構を移動可能に連結した
ステツピングモータと、 ミシン主軸に関連配置しステツピングモータの
駆動タイミングを設定するための位相パルスを発
生する位置検出手段、 位相パルスに関連してステツピングモータに対
し所定回転角を与える駆動パルスを付与する駆動
回路とを有し、 位相パルス発生時に所定数の駆動パルスでステ
ツピングモータを駆動して設定送り量に設定する
ミシンにおいて、 操作により返し縫いを指令する信号を発生する
スイツチ１と、 上記指令信号により作用しミシンの駆動速度を
所定の低速に設定する速度設定回路と、 上記所定の低速を検出して検出信号を発生する
速度検出回路と、 指令信号発生前の正送り量に対応したステツプ
角から所望逆送り量に対応したステツプ角までの
所定の駆動パルス数を複数の位相パルス毎に分割
して発生する第一の制御及び上記所定の駆動パル
ス数を単一の位相パルスに発生する第二の制御と
を選択的に可能とした制御回路と、 指令信号に関連して検出信号の有無を判断し第
一の制御または第二の制御の一方を選択する選択
回路、 とにより、指令信号発生直後の位相パルス期間に
所定駆動パルス数を設定できるときはステツピン
グモータに所定駆動パルス数を付与し、設定でき
ないときは複数の位相パルス毎に分割して付与す
ることを特徴としたミシンの布送り量制御装置。[Scope of Claims] 1. A feed setting mechanism connected to a cloth feed mechanism and capable of setting the cloth feed mechanism between a predetermined forward feed amount and a predetermined reverse feed amount in relation to the movement position; and a step angle. A stepping motor is movably connected to a feed setting mechanism so as to set the feed amount between the above two feed amounts according to the displacement of It has a position detection means and a drive circuit that applies a drive pulse that gives a predetermined rotation angle to the stepping motor in relation to the phase pulse, and sets the stepping motor by driving the stepping motor with a predetermined number of drive pulses when the phase pulse is generated. In a sewing machine that sets the feed amount, a switch 1 generates a signal to command reverse stitching when operated; a speed setting circuit that operates according to the command signal to set the sewing machine drive speed to a predetermined low speed; and a switch 1 that detects the predetermined low speed. and a speed detection circuit that generates a detection signal by dividing the predetermined number of drive pulses from the step angle corresponding to the forward feed amount before the command signal is generated to the step angle corresponding to the desired reverse feed amount into multiple phase pulses. a control circuit that selectively enables a first control that generates the predetermined number of drive pulses and a second control that generates the predetermined number of drive pulses into a single phase pulse; a selection circuit that selects either the first control or the second control; A cloth feed amount control device for a sewing machine is characterized in that the cloth feed amount is applied separately for each of a plurality of phase pulses when it cannot be set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6756585A JPS61226095A (en) | 1985-03-30 | 1985-03-30 | Controller of cloth feed amount |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6756585A JPS61226095A (en) | 1985-03-30 | 1985-03-30 | Controller of cloth feed amount |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61226095A JPS61226095A (en) | 1986-10-07 |
| JPH0230279B2 true JPH0230279B2 (en) | 1990-07-05 |
Family
ID=13348606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6756585A Granted JPS61226095A (en) | 1985-03-30 | 1985-03-30 | Controller of cloth feed amount |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61226095A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006263177A (en) * | 2005-03-24 | 2006-10-05 | Juki Corp | Sewing machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6036089A (en) * | 1983-07-08 | 1985-02-25 | プフアフ インダストリーマシーネン ゲゼルシヤフトミト ベシユレンクテル ハフツング | Sewing machine having apparatus wherein predetermined stitchadvances toward finish point |
-
1985
- 1985-03-30 JP JP6756585A patent/JPS61226095A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6036089A (en) * | 1983-07-08 | 1985-02-25 | プフアフ インダストリーマシーネン ゲゼルシヤフトミト ベシユレンクテル ハフツング | Sewing machine having apparatus wherein predetermined stitchadvances toward finish point |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006263177A (en) * | 2005-03-24 | 2006-10-05 | Juki Corp | Sewing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61226095A (en) | 1986-10-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |