CN105714487A - Sewing machine and control method thereof - Google Patents
Sewing machine and control method thereof Download PDFInfo
- Publication number
- CN105714487A CN105714487A CN201610179079.8A CN201610179079A CN105714487A CN 105714487 A CN105714487 A CN 105714487A CN 201610179079 A CN201610179079 A CN 201610179079A CN 105714487 A CN105714487 A CN 105714487A
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- China
- Prior art keywords
- sewing machine
- hall sensor
- needle
- linear hall
- analog
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
Abstract
The invention discloses a sewing machine and a control method thereof, and belongs to the technical field of manufacturing of sewing machines. The sewing machine comprises a sewing machine table, a sewing machine needle bar, and a sewing machine needle fixedly arranged below the sewing machine needle bar, and also comprises a linear Hall sensor, magnetic steel, an A/D (Analog/Digital) converter and a CPU (Central Processing Unit), wherein the linear Hall sensor is arranged on the bottom surface of the sewing machine table, and the magnetic steel is arranged on the sewing machine needle bar and moves along with the displacement of the sewing machine needle bar. The control method comprises the steps: through a change in positions of the magnetic steel and the linear Hall sensor, the linear Hall sensor transmits voltage signals to the A/D converter, the A/D converter samples the voltage signals and outputs corresponding digital signals to the CPU, and finally, the CPU combines needle position signals and conducts servo control for the sewing machine. The sewing machine and the control method thereof provided by the invention have the advantages of improving the accuracy of system down position, improving the reliability of automatic thread trimming and automatic thread wiping, and avoiding risks of clipping the needle or breaking the needle by wiping.
Description
Technical field
The invention belongs to sewing mechanism technology for making field, be specifically related to a kind of sewing machine and control mode thereof.
Background technology
Industrial computer sewing machine to realize automatic shearing, automatically determine pin number sew, automatically manipulate the strings, the function such as reinforcing seam automatically, it is necessary to employing servo control mode.Technology, progressively develops toward the AC Servo Control mode direction based on vector controlled at present, has speed ring, electric current loop and position ring in technical pattern.
Adopting vector control algorithm, it is achieved the SERVO CONTROL of speed ring, electric current loop and position ring, servo system for sewing machine three close-loop control block diagram is as shown in Figure 2, it is achieved three close-loop control to know the locus of the eedle motion of sewing machine at any time.Current common practice is to adopt the photoelectric encoder being installed on motor end face to detect the eedle position of sewing machine, and described photoelectric encoder schematic diagram is as shown in Figure 3.Being rotated by motor, drive the up and down motion of sewing machine needle, the pulse of photoelectric encoder output simultaneously, central processing unit note photoelectric encoder exports the number of pulse and the dead-center position of debugging, it is possible to judge the position of sewing machine needle place space.But the mode adopting photoelectric encoder checks eedle position, if it is determined that error, the automatic control function of sewing machine not only can not be completed, it is also possible to the eedle of cutting-off sewing machine；And in order to improve control accuracy, common practice is to improve the line number of encoder, namely improving the umber of pulse of for every revolution output, cost is also more high (more than hundreds of unit) simultaneously, therefore relatively costly.
Summary of the invention
It is an object of the invention to provide a kind of sewing machine and control mode thereof, sensing by linear hall sensor with the magnet steel being installed on shank, the voltage signal of reaction magnetic strength positional information is transferred to central processing unit (CPU) by A/D analog-digital converter, and realize the accurate control to eedle position eventually through CPU, realize sewing machine and stop being accurately positioned of pin, guarantee that sewing machine automatic shearing is reliable, the problem not enough to solve above-mentioned prior art.
For achieving the above object, the present invention is by the following technical solutions:
A kind of sewing machine in the present invention, described sewing machine include sewing machine table, needle bar of sewing machine and be fixed on needle bar of sewing machine under sewing machine needle, it is characterized in that, described sewing machine also includes linear hall sensor, magnet steel, A/D analog-digital converter and central processing unit, described linear hall sensor is installed on sewing machine table bottom surface, described magnet steel is installed on needle bar of sewing machine, and the displacement with needle bar of sewing machine displacement.
Preferably, described magnet steel is constant in sewing machine work process with the relative position of sewing machine needle.
The control mode of a kind of sewing machine in the present invention, it is characterized in that, change in location by described magnet steel Yu linear hall sensor, linear hall sensor produces the voltage signal of reaction sewing machine needle position and voltage signal is transferred to A/D analog-digital converter, described A/D analog-digital converter is by voltage signal sampling and exports the digital signal of correspondence to central processing unit, described central processing unit converts digital signals into pin position signal, finally by described central processing unit in conjunction with pin position signal and to sewing machine SERVO CONTROL.
Preferably, described A/D analog-digital converter is according to required sewing machine accuracy selection.
The beneficial effects of the present invention is; constantly can provide sewing machine needle positional information to central processing unit; the eedle of sewing machine moves to and where is perfectly clear; overcoming current sewing machine can only rely on the way improving encoder output umber of pulse to identify the defect of sewing machine needle spatial position precision; improve the accuracy of the stop position of system; improve the reliability of automatic shearing, automatic poking line, it is to avoid during sewing machine, have the phenomenon cutting off eedle or cutting-off eedle to occur at present.This kind of control mode not only can detect the extreme position of eedle during sewing machine operating simultaneously, it is also possible to detects its space position in real time, it is possible to save the conventional eedle localizer of sewing machine SERVO CONTROL and encoder.The present invention adopts linear hall sensor to sense the position of sewing machine needle, can accurately detect all positions within the scope of sewing machine needle movement high-low limit, according to the requirement of control accuracy, suitable analog-digital converter can be selected, makes control mode flexible；On servo control mode, owing to CPU can obtain the eedle position signalling of sewing machine in real time, it is possible to improve the accuracy of system-down position, improve the reliability of automatic shearing, automatic poking line, it is to avoid cut off eedle or the risk of cutting-off eedle.
Accompanying drawing explanation
Such as the system structure schematic diagram that Fig. 1 is a kind of sewing machine of the present invention；
If Fig. 2 is servo system for sewing machine three close-loop control block diagram；
If Fig. 3 is photoelectric encoder schematic diagram；
As Fig. 4 be in the present invention magnet steel around the action effect figure of Hall sensor movement；
If Fig. 5 is linear hall sensor output signal diagram in the present invention；
If Fig. 6 is linear hall sensor output signal CPU sampling segmentation schematic diagram；
Wherein, 1 magnet steel, 2 sewing machine tables, 3 linear hall sensors, 4 sewing machine needles, 5 needle bar of sewing machine.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be easy to understand, below in conjunction with detailed description of the invention, the present invention is expanded on further.
Embodiment 1
As shown in Figure 1, a kind of sewing machine, described sewing machine includes sewing machine table 2, needle bar of sewing machine 5 and the sewing machine needle 4 being fixed under needle bar of sewing machine 5, described sewing machine also includes linear hall sensor 3, magnet steel 1, A/D analog-digital converter and central processing unit, described linear hall sensor 3 is installed on sewing machine table 2 bottom surface, described magnet steel 1 is installed on needle bar of sewing machine 5, and the displacement with needle bar of sewing machine 5 displacement.
It should be noted that described magnet steel 1 is constant in sewing machine work process with the relative position of sewing machine needle 4.
The control mode of a kind of sewing machine in the present invention, change in location by described magnet steel 1 with linear hall sensor 3, linear hall sensor 3 produces the voltage signal of reaction sewing machine needle 4 position and voltage signal is transferred to A/D analog-digital converter, described A/D analog-digital converter is by voltage signal sampling and exports the digital signal of correspondence to central processing unit, described central processing unit converts digital signals into pin position signal, finally by described central processing unit in conjunction with pin position signal and to sewing machine SERVO CONTROL.
In this example, described A/D analog-digital converter is 8 A/D analog-digital converters.
Embodiment 2
Being different in that with above-described embodiment 1, in this example, described A/D analog-digital converter is 10 A/D analog-digital converters.
Embodiment 3
Being different in that with above-described embodiment 1, in this example, described A/D analog-digital converter is 16 A/D analog-digital converters.
Based on above-mentioned, in conjunction with shown in Fig. 4 to Fig. 6, had an effect with being installed on sewing machine table 2 linear hall sensor 3 below by the magnet steel 1 being installed on needle bar of sewing machine 5, motion along with sewing machine needle 4, the relative position of magnet steel 1 and linear hall sensor 3 changes, magnet steel 1 is more near with the relative position of linear hall sensor 3, and it is more strong that linear hall sensor 3 induces signal, otherwise more weak.By reaction sewing machine needle 4 position, the signal sensed by linear hall sensor 3 gives A/D analog-digital converter, obtain the digital signal of reflection magnet steel 1 and linear hall sensor 3 relative position information, this signal is given the central processing unit (CPU) of control system, CPU just can carry out sewing machine SERVO CONTROL in conjunction with this pin position signal, it is achieved sewing machine stops being accurately positioned of pin.Embodiment 1 selects 8 A/D analog-digital converters, will obtain the digital signal of 128 reflection differing needles positions；Embodiment 2 selects 10 A/D analog-digital converters, will obtain the digital signal of 512 reflection differing needles positions；Embodiment 3 selects 16 A/D analog-digital converters, will obtain the digital signal of 32768 reflection differing needles positions.The figure place of A/D analog-digital converter is more high, the precision of detection is more high, the digital signal of reflection differing needles position is given the central processing unit (CPU) of control system, central processing unit just can obtain accurately reflecting the pin position signal of sewing machine needle run location in real time, central processing unit just can carry out sewing machine SERVO CONTROL in conjunction with this pin position signal, realize sewing machine and stop being accurately positioned of pin, it is ensured that the function-stables such as sewing machine automatic shearing, automatic poking line are reliable, it is ensured that servo-controlled stability.
Those of ordinary skill in the art will be appreciated that, above embodiments is intended merely to the explanation present invention, and it is not used as limitation of the invention, as long as in the spirit of the present invention, the change of embodiment described above, modification all will be dropped in scope of the presently claimed invention.
Claims (4)
1. a sewing machine, described sewing machine include sewing machine table, needle bar of sewing machine and be fixed on needle bar of sewing machine under sewing machine needle, it is characterized in that, described sewing machine also includes linear hall sensor, magnet steel, A/D analog-digital converter and central processing unit, described linear hall sensor is installed on sewing machine table bottom surface, described magnet steel is installed on needle bar of sewing machine, and the displacement with needle bar of sewing machine displacement.
2. a kind of sewing machine according to claim 1, it is characterised in that described magnet steel is constant in sewing machine work process with the relative position of sewing machine needle.
3. the control mode of a sewing machine as claimed in claim 2, it is characterized in that, change in location by described magnet steel Yu linear hall sensor, linear hall sensor produces the voltage signal of reaction sewing machine needle position and voltage signal is transferred to A/D analog-digital converter, described A/D analog-digital converter is by voltage signal sampling and exports the digital signal of correspondence to central processing unit, described central processing unit converts digital signals into pin position signal, finally by described central processing unit in conjunction with pin position signal and to sewing machine SERVO CONTROL.
4. the control mode of a kind of sewing machine according to claim 2, it is characterised in that described A/D analog-digital converter is according to required sewing machine accuracy selection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610179079.8A CN105714487A (en) | 2016-03-25 | 2016-03-25 | Sewing machine and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610179079.8A CN105714487A (en) | 2016-03-25 | 2016-03-25 | Sewing machine and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105714487A true CN105714487A (en) | 2016-06-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610179079.8A Pending CN105714487A (en) | 2016-03-25 | 2016-03-25 | Sewing machine and control method thereof |
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| CN (1) | CN105714487A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112981750A (en) * | 2021-03-15 | 2021-06-18 | 琦星智能科技股份有限公司 | Parking inductor of buttonhole maker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07669A (en) * | 1993-06-21 | 1995-01-06 | Juki Corp | Control device for sewing machine |
| JPH07670A (en) * | 1993-06-17 | 1995-01-06 | Juki Corp | Setting work instructing device for sewing machine |
| CN201077895Y (en) * | 2007-09-11 | 2008-06-25 | 任奕彪 | Integral numerical control industrial sewing electric machine |
| CN101701401A (en) * | 2009-11-25 | 2010-05-05 | 苏州扬名机电有限公司 | Installation structure of position sensors of sewing machine needle |
| CN103710907A (en) * | 2014-01-03 | 2014-04-09 | 南通纺织职业技术学院 | Method for controlling sewing machine |
-
2016
- 2016-03-25 CN CN201610179079.8A patent/CN105714487A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07670A (en) * | 1993-06-17 | 1995-01-06 | Juki Corp | Setting work instructing device for sewing machine |
| JPH07669A (en) * | 1993-06-21 | 1995-01-06 | Juki Corp | Control device for sewing machine |
| CN201077895Y (en) * | 2007-09-11 | 2008-06-25 | 任奕彪 | Integral numerical control industrial sewing electric machine |
| CN101701401A (en) * | 2009-11-25 | 2010-05-05 | 苏州扬名机电有限公司 | Installation structure of position sensors of sewing machine needle |
| CN103710907A (en) * | 2014-01-03 | 2014-04-09 | 南通纺织职业技术学院 | Method for controlling sewing machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112981750A (en) * | 2021-03-15 | 2021-06-18 | 琦星智能科技股份有限公司 | Parking inductor of buttonhole maker |
| CN112981750B (en) * | 2021-03-15 | 2024-04-26 | 琦星智能科技股份有限公司 | Parking sensor of buttonholing machine |
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Application publication date: 20160629 |