CN1730765A - Upper and lower needle stop controlling means of industrial sewing machine - Google Patents
Upper and lower needle stop controlling means of industrial sewing machine Download PDFInfo
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- CN1730765A CN1730765A CN 200510060639 CN200510060639A CN1730765A CN 1730765 A CN1730765 A CN 1730765A CN 200510060639 CN200510060639 CN 200510060639 CN 200510060639 A CN200510060639 A CN 200510060639A CN 1730765 A CN1730765 A CN 1730765A
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- speed
- motor
- lower needle
- needle stop
- sewing machine
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Abstract
The upper and lower needle stop control method for industrial sewing machine includes the following steps: 1. measuring the rotation speed of the motor with the photoelectonic coder after the motor is started; 2. turning to measure the rotation speed of the motor with the three conversion signal switches after the photoelectonic coder measured rotation speed is greater than the clinical value; 3. maintaining the rotation speed measuring state after the conversion signal switches measured rotation speed is greater than the clinical value; and 4. turning to measure the rotation speed of the motor with the photoelectonic coder and starting measuring the relative position of rotor to the stator to control the upper and the lower needle stop via matching which the upper and the lower needle stop signal sensors after the conversion signal switches measured rotation speed is not greater than the clinical value. The clinical speed has the value range from 50 rpm to maximum response speed of the photoelectonic coder.
Description
Technical field
The present invention relates to the industrial sewing machine field, specifically, relate to the upper and lower needle stop controlling means of industrial sewing machine.
Background technology
The industrial sewing machine of selling on market at present generally all has the upper and lower needle stop function, realize this function, and computerized control system detects the physical location that motor rotates according to the position coder that is contained on the servo motor rotor in the machine.
Usually, the position sensor that uses on motor has three kinds: first kind is to utilize rotary transformer to come the take-off location signal, this method is to utilize rotary transformer output two-phase orthogonal waveforms, absolute position that can output rotor, but its decoding circuit and mechanism's complexity, volume is big, cost is high; Second kind is to use magnetic coder, relies on the pole change detection position, still be in conceptual phase at present, and resolution ratio is lower, generally uses fewer; The third is widely used at present, utilization obtains position signalling by the photoelectric encoder that an a pair of photoelectric tube and a coding disk constitute, the advantage of this method is that circuit is simple, compact conformation, easy for installation, but it is comparatively expensive that its shortcoming is this motor special photoelectric encoder, and it is higher that its price accounts for the ratio of servomotor body.
The photoelectric encoder of computer control industrial sewing machine has two effects in electric machine control system: the one, and the relative position of detection motor stator and rotor, the 2nd, the rotary speed of detection rotor.
Usually, the speed adjustable range of industrial sewing machine is from 150 rev/mins～6000 rev/mins, the principle that present known upper and lower needle stop and speed detect realizes by photoelectric encoder: be connected one along the peripheral coding disk that is evenly equipped with a plurality of radially narrow slits on rotor axis of electric, a pair of photoelectric coding is separately positioned on the both sides up and down of this coding disk and aims at narrow slit pipe, by electric machine controller from this photoelectric coding to being in control the A/B two paths of signals of quadrature, orthogonal coding interface (QEI) by digital signal processor (DSP) or microprogram control unit (MCU) carries out the data processing again, thereby obtain rotating speed of motor, the relative position of rotor and stator, this relative position and upper and lower needle stop signal transducer are cooperatively interacted, thereby realize accurate upper and lower needle stop function.
On the other hand, operated by rotary motion has three electrical signal phases to be mutually 120 ° commutation signal switch (common is reflective photoelectric switch or Hall switch) in existing industrial sewing machine, it mainly acts on is by to the measurement of rotor commutation signal or the measurement of position signalling, drives rotor by electric machine controller and normally rotates.But, in the prior art, also have by rational programming Control, utilize this three commutation signal switches, also energy measurement goes out rotating speed of motor, but its certainty of measurement is lower slightly, particularly when motor was in lower-speed state, its tachometric survey precision was minimum, can not measure the exact position of rotor, and needed DSP or MCU expense are bigger, thereby can not directly be used for control to upper and lower needle stop.
Summary of the invention
Technical problem to be solved by this invention provides a kind of upper and lower needle stop controlling means of new industrial sewing machine, by using this control method, can reduce the response speed requirement of photoelectric encoder greatly, thereby reduce the manufacturing cost of whole servomotor.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: the upper and lower needle stop controlling means of this industrial sewing machine may further comprise the steps:
1. begin at electric motor starting, utilize photoelectric encoder to measure rotating speed of motor earlier;
2. when utilizing photoelectric encoder to measure the motor speed rotating speed, change by utilizing three commutation signal switches to take over measurement to motor speed greater than critical speed;
3. when utilizing the measured motor speed of three commutation signal switches, keep its state that tests the speed greater than critical speed;
4. when utilizing three measured motor speeds of commutation signal switch to be less than or equal to critical speed, commentaries on classics is taken over measurement to motor speed by photoelectric encoder, begin to measure the relative position of rotor and stator simultaneously, and control upper and lower needle stop with the work that cooperatively interacts of upper and lower needle stop signal transducer;
Wherein, the span of critical speed is: the high response speed of 50 rev/mins≤critical speed≤photoelectric encoder; Because cheap in the market mechanical type mouse just has 2000 rev/mins high response speed with phototube, therefore in order under lower-speed state, to improve certainty of measurement, simultaneously also needed DSP or MCU expense in order to be reduced in lower-speed state and to utilize three commutation signal switches to measure, described critical speed is good with 170 commentaries on classics/parts～200 commentaries on classics/parts.
The inventive method utilizes industrial sewing machine must be in the principle of lower-speed state earlier when upper and lower needle stop, utilize existing commutation signal switch to test the speed, photoelectric encoder is only just measured when critical speed is following at motor speed, thereby greatly reduce the response speed requirement of photoelectric encoder, Lian Jia mechanical type mouse can meet the demands with phototube in the market, thereby reduces the manufacturing cost of whole servomotor.
Description of drawings
Fig. 1 is the perspective exploded view of the embodiment of the invention
Fig. 2 is the side view after the parts assembling shown in Figure 1.
The specific embodiment
Below in conjunction with accompanying drawing embodiment invention is described in further detail.
As Fig. 1, shown in Figure 2, be one embodiment of the present of invention, one central authorities have and hold the circuit board 2 that rotor axis of electric 1 passes and be provided with reception diode 31, emitting diode 32 and three commutation signal switches 4, these three commutation signal switches 4 can adopt reflective photoelectric switch or Hall switch, end at rotor axis of electric 1 is connected one along the peripheral coding disk 33 that is evenly equipped with a plurality of radially narrow slit 33a by screw 5, and the edge of this coding disk 33 is inserted in described photoelectric tube 31, between 32, the luminous energy that emitting diode 32 is sent passes the narrow slit 33a of coding disk 33, so, reception diode 31, emitting diode 32 and coding disk 33 constitute a photoelectric encoder;
Begin at electric motor starting, utilize photoelectric encoder to measure rotating speed of motor earlier;
When utilizing photoelectric encoder to measure the motor speed rotating speed, change by utilizing three commutation signal switches 4 to take over measurement to motor speed greater than critical speed;
When utilizing the measured motor speed of three commutation signal switches 4, keep its state that tests the speed greater than critical speed;
When utilizing three commutation signal switches, 4 measured motor speeds to be less than or equal to critical speed, commentaries on classics is taken over measurement to motor speed by photoelectric encoder, begin to measure the relative position of rotor and stator simultaneously, concrete grammar can adopt prior art, it is electric machine controller obtains quadrature from this photoelectric encoder A/B two paths of signals, orthogonal coding interface (QEI) by digital signal processor (DSP) or microprogram control unit (MCU) carries out the data processing again, thereby obtain rotating speed of motor, the relative position of rotor and stator, this relative position and upper and lower needle stop signal transducer are cooperatively interacted, thereby realize accurate upper and lower needle stop function.
Wherein, the span of critical speed is: the high response speed of 50 rev/mins≤critical speed≤photoelectric encoder is good with 170 rev/mins～200 rev/mins.
Claims (3)
1, a kind of upper and lower needle stop controlling means of industrial sewing machine is characterized in that may further comprise the steps:
1. begin at electric motor starting, utilize photoelectric encoder to measure rotating speed of motor earlier;
2. when utilizing photoelectric encoder to measure the motor speed rotating speed, change by utilizing three commutation signal switches to take over measurement to motor speed greater than critical speed;
3. when utilizing the measured motor speed of three commutation signal switches, keep its state that tests the speed greater than critical speed;
4. when utilizing three measured motor speeds of commutation signal switch to be less than or equal to critical speed, commentaries on classics is taken over measurement to motor speed by photoelectric encoder, begin to measure the relative position of rotor and stator simultaneously, and control upper and lower needle stop with the work that cooperatively interacts of upper and lower needle stop signal transducer;
Wherein, the span of critical speed is: the high response speed of 50 rev/mins≤critical speed≤photoelectric encoder.
2, the upper and lower needle stop controlling means of industrial sewing machine according to claim 1 is characterized in that the span of described critical speed is: 170 rev/mins～200 rev/mins.
3, the upper and lower needle stop controlling means of industrial sewing machine according to claim 1 and 2 is characterized in that described commutation signal switch is reflective photoelectric switch or Hall switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510060639 CN1730765A (en) | 2005-09-02 | 2005-09-02 | Upper and lower needle stop controlling means of industrial sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510060639 CN1730765A (en) | 2005-09-02 | 2005-09-02 | Upper and lower needle stop controlling means of industrial sewing machine |
Publications (1)
| Publication Number | Publication Date |
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| CN1730765A true CN1730765A (en) | 2006-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 200510060639 Pending CN1730765A (en) | 2005-09-02 | 2005-09-02 | Upper and lower needle stop controlling means of industrial sewing machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104294481A (en) * | 2014-09-24 | 2015-01-21 | 上海鲍麦克斯电子科技有限公司 | Digital control system and method of industrial sewing machine |
| CN104296787A (en) * | 2014-10-23 | 2015-01-21 | 杰克缝纫机股份有限公司 | Motor position detection sensing device on sewing machine |
| CN104762759A (en) * | 2015-04-29 | 2015-07-08 | 武汉加权科技有限公司 | High-speed industrial sewing machine servo control device and control method |
-
2005
- 2005-09-02 CN CN 200510060639 patent/CN1730765A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104294481A (en) * | 2014-09-24 | 2015-01-21 | 上海鲍麦克斯电子科技有限公司 | Digital control system and method of industrial sewing machine |
| CN104294481B (en) * | 2014-09-24 | 2016-10-19 | 上海鲍麦克斯电子科技有限公司 | A kind of industrial sewing machine numerical control system and control method |
| CN104296787A (en) * | 2014-10-23 | 2015-01-21 | 杰克缝纫机股份有限公司 | Motor position detection sensing device on sewing machine |
| CN104762759A (en) * | 2015-04-29 | 2015-07-08 | 武汉加权科技有限公司 | High-speed industrial sewing machine servo control device and control method |
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Open date: 20060208 |