JP2603624B2 - Servo motor controller for sewing machine - Google Patents
Servo motor controller for sewing machineInfo
- Publication number
- JP2603624B2 JP2603624B2 JP61285209A JP28520986A JP2603624B2 JP 2603624 B2 JP2603624 B2 JP 2603624B2 JP 61285209 A JP61285209 A JP 61285209A JP 28520986 A JP28520986 A JP 28520986A JP 2603624 B2 JP2603624 B2 JP 2603624B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- servomotor
- sewing machine
- terminal
- 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
Landscapes
- Sewing Machines And Sewing (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Ac Motors In General (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、商用交流波を電源としたサーボモータの
駆動を制御するミシンにおけるサーボモータ制御装置に
関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a servo motor control device in a sewing machine that controls driving of a servo motor using a commercial AC wave as a power supply.
通常、縫製工場では稼働率を高めるためミシン起動時
にペダルを急激に深く踏み込んでミシンをいきなり高速
状態にするが、ミシン駆動源にサーボモータを利用した
場合、この起動時のサーボモータへの急激な電流供給に
より工場内の交流電源が急激に電圧降下を生じ、同じ電
源を利用した照明器具にちらつきを生じた。このちらつ
きを防止するため、サーボモータへの最大電流値を制御
するものが知られている。Normally, in a sewing factory, the pedal is depressed deeply and suddenly when starting the sewing machine to increase the operating rate, and the sewing machine suddenly enters a high speed state.However, when a servo motor is used as the sewing machine drive source, the The AC power supply in the factory caused a sudden voltage drop due to the current supply, and the lighting equipment using the same power supply flickered. In order to prevent this flicker, there is known a device that controls a maximum current value to a servomotor.
サーボモータへの最大電流値を制限すると、電源の電
圧降下がなくともサーボモータの加速性能が低下しミシ
ンの能率が低下するとともに、低速時の回転トルクが下
がり厚布等の縫製に支障をきたした。Limiting the maximum current value to the servomotor reduces the acceleration performance of the servomotor and reduces the efficiency of the sewing machine even if there is no voltage drop of the power supply. did.
この発明は、これら従来の欠点を除去することを目的
とする。The present invention aims to eliminate these conventional disadvantages.
この発明は、ミシン主軸に連結し商用交流波を電源と
しペダルの足踏み操作に関連する電流供給量の変化によ
り駆動停止するサーボモータを有するミシンにおいて、
上記商用交流波を整流し平滑して直流に変換する直流回
路と、上記直流回路に接続した基準入力と比較入力との
電圧レベルを比較する比較回路と、サーボモータ停止状
態における比較入力の電圧レベルを基準入力よりも高く
する設定回路と、上記整流し平滑した電源電圧の電圧降
下による基準入力の電圧変動を緩和する緩和回路と、比
較回路の出力に基づいて比較入力の電圧レベルが基準入
力に対し高いときサーボモータへ電流を供給し低いとき
電流を遮断または減少する制御回路、とを備えたことに
より達成するものである。The present invention relates to a sewing machine having a servomotor connected to a main shaft of a sewing machine and driven to stop by a change in a current supply amount related to a stepping operation of a pedal using a commercial AC wave as a power supply.
A DC circuit for rectifying and smoothing the commercial AC wave and converting it to DC; a comparison circuit for comparing the voltage levels of a reference input and a comparison input connected to the DC circuit; and a voltage level of the comparison input when the servomotor is stopped. A setting circuit that makes the reference input higher than the reference input, a mitigation circuit that reduces voltage fluctuations of the reference input due to the voltage drop of the rectified and smoothed power supply voltage, and a voltage level of the comparison input based on the output of the comparison circuit that is applied to the reference input. A control circuit for supplying a current to the servomotor when the voltage is high and interrupting or reducing the current when the voltage is low.
この発明の実施例を図面において説明すると、 は商用交流電源Ｅに接続した電源スイッチ、 は交流波を全波整流する整流回路、 は基準側入力端子（＋）と比較側入力端子（−）とを
有し基準側入力電圧よりも比較側入力電圧が高いとき端
子を論理上Ｌレベルとし低いときＨレベルとする比較
回路である。R1,R2は端子の電位を決めるように分圧
する分圧回路（設定回路）を構成する抵抗、R3,R4,VRは
端子の電位をしてサーボモータ停止時に端子の電位
よりも高電位となるように分圧する分圧回路（設定回
路）を構成する抵抗であり、特に抵抗VRは分圧比を調整
するため可変抵抗としてある。Ｃは緩和回路を構成し抵
抗R2と並列に設けたコンデンサである。R5,R6は比較回
路にヒステリシス幅を持たせるための抵抗であり、比
較回路の端子がＨＬに変化するときの端子の電
圧変化幅は抵抗R6により決められる。は交流サーボモ
ータへの駆動電流を供給遮断する制御回路であり、ペ
ダル（図示しない）の操作量を検出する検出回路から
の検出信号に基づく速度でサーボモータを駆動または
停止するように電流制御し、特に端子がＨレベルのと
きには該検出信号に関らずサーボモータへの電流を遮
断するように制御する。なお、第１図において、Ｌは交
流電源に接続した照明器具である。An embodiment of the present invention will be described with reference to the drawings. A power switch connected to a commercial AC power supply E, a rectifier circuit for full-wave rectification of an AC wave, a reference input terminal (+) and a comparison input terminal (-) A comparison circuit that sets the terminal to a logical low level when the comparison side input voltage is higher than the reference side input voltage and sets the terminal to a high level when the comparison side input voltage is lower than the reference side input voltage. R 1 and R 2 are resistors constituting a voltage dividing circuit (setting circuit) for dividing the voltage so as to determine the potential of the terminal, and R 3 , R 4 and VR are the potential of the terminal and are higher than the potential of the terminal when the servomotor is stopped. A resistor constituting a voltage dividing circuit (setting circuit) for dividing the voltage so as to have a high potential. In particular, the resistor VR is a variable resistor for adjusting the voltage dividing ratio. C is a capacitor provided in parallel with the configured relaxation circuit resistance R 2. R 5 and R 6 are resistors for providing a hysteresis width to the comparison circuit, and the voltage change width of the terminal when the terminal of the comparison circuit changes to HL is determined by the resistor R 6 . Is a control circuit that supplies and cuts off the drive current to the AC servomotor, and controls the current so that the servomotor is driven or stopped at a speed based on a detection signal from a detection circuit that detects an operation amount of a pedal (not shown). In particular, when the terminal is at H level, control is performed so as to cut off the current to the servomotor regardless of the detection signal. In addition, in FIG. 1, L is a lighting fixture connected to an AC power supply.
次に本実施例の作用を説明する。 Next, the operation of the present embodiment will be described.
ミシン、すなわちサーボモータの停止時には端子
の電位は端子に対し一定の差をもって高電位を保って
いる。ペダルを急激に踏み込んでサーボモータを急加
速させると前記したように電源電圧が降下する。これに
伴ない端子は電源の変化と同様に電位が低下するが、
端子はコンデンサＣの放電する電流によりその変動は
緩和されて微少変化となり元の電位に略保たれる。この
ため端子の電位は端子の電位より低くなり、基準側
入力（端子ａ）の電圧より低くなったとき端子がＨレ
ベルとなって制御回路はサーボモータへの電流を遮
断する。これと同時に抵抗R6を介して端子ａの電位がヒ
ステリシス幅分上昇する。サーボモータへの電流が遮
断されると電源電圧が復帰し、端子の電圧は元の電位
に略保たれているから、端子の電位は直ぐに端子ａの
電位を越えて端子はＬレベルとなり、制御回路はサ
ーボモータへの電流供給を再開する。When the sewing machine, that is, the servomotor is stopped, the potential of the terminal maintains a high potential with a certain difference from the terminal. When the servomotor is rapidly accelerated by rapidly depressing the pedal, the power supply voltage drops as described above. Along with this, the potential of the terminal drops in the same way as the power supply changes,
The fluctuation of the terminal is reduced by the discharge current of the capacitor C and becomes a slight change, and is substantially maintained at the original potential. For this reason, the potential of the terminal becomes lower than the potential of the terminal. When the potential of the terminal becomes lower than the voltage of the reference side input (terminal a), the terminal becomes H level and the control circuit cuts off the current to the servomotor. Through simultaneously resistor R 6 to this potential of the terminal a increases hysteresis width min. When the current to the servomotor is cut off, the power supply voltage is restored, and the voltage of the terminal is almost kept at the original potential. Therefore, the potential of the terminal immediately exceeds the potential of the terminal a, and the terminal goes to the L level. The circuit resumes supplying current to the servomotor.
これにより再び電源電圧が降下して前記と同様にサー
ボモータへの電流を遮断する。As a result, the power supply voltage drops again, and the current to the servomotor is cut off as described above.
以後同様に遮断、供給を繰り返す。 Thereafter, cutoff and supply are repeated in the same manner.
このサーボモータ駆動に起因せず電力消費増大によっ
て商用交流電源が全体的に電圧降下を生じると、端子
の電位も追従して変化する。即ちミシン駆動前における
端子と端子の電位差は電源電圧の変動に関らず一定
に保たれ、端子ａの電位も変化しないからその後のペダ
ルの急激な踏み込み時の制御も前記と同様に確実に行な
われる。If a voltage drop occurs in the commercial AC power supply as a whole due to an increase in power consumption without being driven by the servomotor driving, the potential of the terminal changes accordingly. That is, before the sewing machine is driven, the potential difference between the terminals is kept constant irrespective of the fluctuation of the power supply voltage, and the potential of the terminal a does not change. It is.
以上、本実施例ではアナログ回路により説明したが、
A/D変換してマイクロコンピュータによるデジタル制御
によっても容易にできる。As described above, the present embodiment has been described using the analog circuit.
A / D conversion can be easily performed by digital control by a microcomputer.
この発明によれば、ペダルの急激な踏み込みによるサ
ーボモータの急加速時において、サーボモータ駆動に起
因して電源の電圧降下が発生するときにはサーボモータ
への電流供給を遮断して一定以上の電圧降下を防ぎ、こ
れにより同一電源をもつ照明器具のちらつきを防止する
とともに、市販電源が全体的に電圧降下を生じたときで
も、通常と同様にサーボモータ駆動に起因する電圧降下
を検知できるから、サーボモータの電流遮断時間が長く
なることがなく、ミシンの急加速が可能となり、且つ低
速時の回転トルクを下げることがなく、厚物縫いを確実
にする等の効果が得られる。According to the present invention, at the time of sudden acceleration of the servomotor due to rapid depression of the pedal, when a voltage drop of the power supply occurs due to the servomotor drive, the current supply to the servomotor is cut off to cause the voltage drop of a certain level or more. This prevents flickering of lighting fixtures with the same power supply and, even when a commercial power supply has a voltage drop as a whole, can detect the voltage drop due to the servo motor drive as usual, The current interrupting time of the motor is not lengthened, the sewing machine can be rapidly accelerated, and the effect of securing thick sewing can be obtained without lowering the rotational torque at low speed.
なお本実施例では端子がＨレベルとなったときサー
ボモータへの電流を遮断したが、電流を減少するように
制御しても同様の効果が得られる。In this embodiment, the current to the servomotor is cut off when the terminal goes to the H level. However, the same effect can be obtained by controlling the current to decrease.
第１図は本実施例の電気回路図、 第２図はタイムチャートである。 R1,R2,R3,R4,VR……設定回路 Ｃ……コンデンサ（緩和回路） ３……比較回路 ４……制御回路 ５……サーボモータ R5,R6……ヒステリシス用抵抗FIG. 1 is an electric circuit diagram of the present embodiment, and FIG. 2 is a time chart. R 1 , R 2 , R 3 , R 4 , VR ... Setting circuit C ... Capacitor (mitigation circuit) 3 ... Comparison circuit 4 ... Control circuit 5 ... Servo motor R 5 , R 6 ... Hysteresis resistance
Claims (1)
ペダルの足踏み操作に関連する電流供給量の変化により
駆動停止するサーボーモータを有するミシンにおいて、 上記商用交流波を整流し平滑して直流に変換する直流回
路と、 上記直流回路に接続した基準入力と比較入力との電圧レ
ベルを比較する比較回路と、 サーボモータ停止状態における比較入力の電圧レベルを
基準入力よりも高くする設定回路と、 上記整流し平滑した電源電圧の電圧降下による基準入力
の電圧変動を緩和する緩和回路と、 比較回路の出力に基づいて比較入力の電圧レベルが基準
入力に対し高いときサーボモータへ電流を供給し低いと
き電流を遮断または減少する制御回路、 とを備えたミシンにおけるサーボモータ制御装置。1. A sewing machine having a servomotor connected to a main shaft of a sewing machine and stopped by a change in a current supply amount related to a stepping operation of a pedal using a commercial AC wave as a power supply. The commercial AC wave is rectified and smoothed to DC. A DC circuit for conversion; a comparison circuit for comparing the voltage levels of a reference input and a comparison input connected to the DC circuit; a setting circuit for setting the voltage level of the comparison input higher than the reference input when the servomotor is stopped; A mitigation circuit that alleviates the voltage fluctuation of the reference input due to the voltage drop of the rectified and smoothed power supply voltage, and when the current is supplied to the servomotor and low when the voltage level of the comparison input is higher than the reference input based on the output of the comparison circuit A control circuit for interrupting or reducing the current;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61285209A JP2603624B2 (en) | 1986-11-29 | 1986-11-29 | Servo motor controller for sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61285209A JP2603624B2 (en) | 1986-11-29 | 1986-11-29 | Servo motor controller for sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63140691A JPS63140691A (en) | 1988-06-13 |
| JP2603624B2 true JP2603624B2 (en) | 1997-04-23 |
Family
ID=17688514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61285209A Expired - Lifetime JP2603624B2 (en) | 1986-11-29 | 1986-11-29 | Servo motor controller for sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2603624B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046244B (en) * | 2011-10-13 | 2016-05-04 | Juki株式会社 | Sewing machine controls |
| JP6031243B2 (en) * | 2012-03-28 | 2016-11-24 | Juki株式会社 | sewing machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5367848A (en) * | 1976-11-29 | 1978-06-16 | Nec Corp | Output voltage compensating circuit for dc power source |
| JPS576576A (en) * | 1980-06-11 | 1982-01-13 | Mitsubishi Electric Corp | Power supply for inverter |
-
1986
- 1986-11-29 JP JP61285209A patent/JP2603624B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63140691A (en) | 1988-06-13 |
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