CN110761005B - Sewing control method based on sewing material thickness detection - Google Patents
Sewing control method based on sewing material thickness detection Download PDFInfo
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- CN110761005B CN110761005B CN201810833887.0A CN201810833887A CN110761005B CN 110761005 B CN110761005 B CN 110761005B CN 201810833887 A CN201810833887 A CN 201810833887A CN 110761005 B CN110761005 B CN 110761005B
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Abstract
The invention provides a sewing control method based on sewing material thickness detection, and electricityThe control module judges the real-time voltage value UaLess than the target voltage value UbThe following controls are performed: if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaIs always less than the target voltage value UbThen the sewing machine sews the sewing material in a speed-reducing sewing state; if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaAround the target voltage value UbFluctuating up and down and having at least a real-time voltage value UaWithin the preset fluctuation range, the sewing machine sews the sewing material in a speed-reducing sewing state; if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaAround the target voltage value UbFluctuating up and down and real-time voltage value UaAnd if the preset fluctuation range is exceeded all the time, the main motor in the sewing machine continues to keep a normal sewing state. The method and the device can eliminate the detection fluctuation error caused by the vertical lifting of the feed dog, and avoid the electronic control module from executing speed reduction control by mistake.
Description
Technical Field
The invention relates to a sewing machine, in particular to a sewing control method based on sewing material thickness detection.
Background
The thickness of the sewing material in the existing sewing machine is generally detected by lifting and descending a presser foot of the sewing machine, then the relative position change between a magnet which is synchronous up and down with the presser foot and a linear Hall sensor with fixed position is combined, the magnetic strength received by the linear Hall sensor is received by an electric control module in the sewing machine, and the electric control module judges the thickness degree of the sewing material according to the output signal of the linear Hall sensor, so that the thickness detection of the sewing material in the sewing machine is realized, and the sewing performance is controlled. Such as: chinese utility model patent with publication number CN206232934U discloses a sewing machine, the description [ 0036 ] to [ 0038 ] of which describes: the sewing machine is provided with a sensor for detecting the thickness of the sewing material, the sensor comprises a Hall sensor and a magnet, the magnet is arranged on the presser foot arm, the Hall sensor is arranged on the shell of the machine head, and the thickness of the sewing material is sensed by sensing the strength of the magnet through the Hall sensor; an electric control box in the sewing machine controls the sewing performance of the sewing machine according to the received signals of the Hall sensor, such as: the rotating speed of the sewing machine is automatically adjusted.
Generally, a control method for automatically adjusting the rotation speed of a sewing machine according to the detected thickness of the sewing material is as follows: firstly, setting a target value in an electric control module, and when the strength of a magnet received by a Hall sensor exceeds the set target value, indicating that the distance between the Hall sensor and the magnet is short, the thickness of a sewing material is reduced, and the sewing material is thin, and at the moment, the electric control module sends a speed-up signal to a main motor for controlling the operation of a sewing machine; on the contrary, when the strength of the magnet received by the Hall sensor is lower than the set target value, the fact that the distance between the Hall sensor and the magnet is longer and the thickness of the sewing material is increased to be thick is indicated, and at the moment, the electronic control module sends a speed reduction signal to a main motor for controlling the operation of the sewing machine.
However, the above control method for automatically adjusting the rotation speed of the sewing machine according to the detected thickness of the sewing material is single and direct, and cannot be adapted to sewing with complicated environment. In particular, the lifting height of the presser foot of the sewing machine is not high, so the change stroke of the upper position and the lower position of the magnet is not large; when the sewing machine is operated, if the value of the thickness of the sewing material is just at a target value set by the electronic control module or a range value which is not large, the height of a presser foot of the sewing machine is floated up and down due to the lifting of the feed dog, so that the magnet is floated up and down, the strength of the magnet received by the Hall sensor is correspondingly changed, and the signal received by the electronic control module of the sewing machine is fluctuated greatly and quickly; if the target value set in the electric control module is exactly in the fluctuation range, the electric control module frequently controls the main motor to slow down or speed up, so that the rotating speed of the sewing machine is unstable, and the sewing process and the sewing experience are seriously influenced. The above-described fluctuation may occur when the thickness of the sewing material in the sewing direction is rapidly changed, including when the combined fabric is sewn, and the like, the rotation speed is unstable.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a sewing control method based on seam material thickness detection, which can eliminate the influence of fluctuation caused by the vertical lifting of a feed dog on the rotating speed of a sewing machine, and improve the stability of the rotating speed of the sewing machine.
In order to achieve the above object, the present invention provides a first embodiment of a sewing control method based on seam material thickness detection, which includes the following steps:
s1, arranging a Hall sensor with a fixed position and a magnet fixed on the presser foot arm, wherein the Hall sensor can sense the magnet and is connected with an electric control module in the sewing machine;
s2, presetting a target voltage value U in the electric control modulebFluctuation threshold UxAnd buffering the anticipation time T;
s3, when the sewing machine sews the sewing material, the electric control module detects the real-time voltage value U output by the Hall sensoraSaid real-time voltage value UaThe real-time thickness of the sewing material is represented; the electric control module judges the real-time voltage value UaWhether or not it is less than the target voltage value UbIf yes, executing the following step S4, otherwise, controlling the main motor to keep the normal sewing state by the electric control module;
s4, the electric control module starts timing and times the full buffer pre-judgment time T, and meanwhile the electric control module obtains a preset fluctuation range which is Ub～Ub+Ux(ii) a The electric control module judges the real-time voltage value U in time T according to the bufferingaThe following controls are performed:
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaIs always less than the target voltage value UbIf the electronic control module times the buffering pre-judgment time T, the main motor in the sewing machine is controlled to reduce the speed, so that the sewing machine sews the sewing material in a speed-reduced sewing state;
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaAround the target voltage value UbFluctuating up and down and having at least a real-time voltage value UaIn a preset fluctuation range, the electronic control module controls the main motor in the sewing machine to decelerate after the buffering prejudgment time T is timed out, so that the sewing machine sews the sewing material in a decelerating sewing state;
within the buffering pre-judging time T, if electricity is suppliedThe control module judges the real-time voltage value UaAround the target voltage value UbFluctuating up and down and real-time voltage value UaAnd if the preset fluctuation range is exceeded all the time, the electric control module controls a main motor in the sewing machine to continuously keep a normal sewing state after the electric control module times the buffering pre-judgment time T.
Further, the fluctuation threshold UxThe value range is as follows: U3-Ub<Ux<U3-U4, wherein U3 is the voltage value output by the Hall sensor when the feed dog is at the lowest point after the sewing material is put in the lower part of the middle presser foot of the sewing machine, and U4 is the voltage value output by the Hall sensor when the feed dog is at the highest point after the sewing material is put in the lower part of the middle presser foot of the sewing machine.
Further, the Hall sensor is fixed on the head part of the sewing machine shell.
Further, the hall sensor is a linear hall sensor.
Further, the real-time voltage value U output by the Hall sensoraInversely proportional to the thickness value of the seam material.
In order to achieve the above object, the present invention further provides a second embodiment of a sewing control method based on seam material thickness detection, comprising the following steps:
the sewing machine comprises a Z1, a Hall sensor with a fixed setting position and a magnet fixed on a presser foot arm, wherein the Hall sensor can sense the magnet and is connected with an electric control module in the sewing machine;
z2, presetting a target voltage value U in the electric control modulebFluctuation threshold UxAnd buffering the anticipation time T;
z3, when the sewing machine sews the sewing material, the electric control module detects the real-time voltage value U output by the Hall sensoraSaid real-time voltage value UaThe real-time thickness of the sewing material is represented; the electric control module judges the real-time voltage value UaWhether or not it is less than the target voltage value UbIf yes, executing the following step S4, otherwise, controlling the main motor to keep the normal sewing state by the electric control module;
z4, electric control module instantly controls the main motor in the sewing machine to reduce the speed to make the seamSewing the sewing material by the sewing machine in a speed-reducing sewing state, simultaneously, starting timing and timing by the electric control module to fill the buffer prejudgment time T, acquiring a preset fluctuation range by the electric control module, wherein the preset fluctuation range is Ub～Ub+Ux(ii) a The electric control module judges the real-time voltage value U in time T according to the bufferingaThe following controls are performed:
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaIs always less than the target voltage value UbIf the buffer pre-judgment time T is up, the electronic control module controls the sewing machine to continuously keep the speed reduction sewing state;
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaAround the target voltage value UbFluctuating up and down and having at least a real-time voltage value UaIn the preset fluctuation range, the electronic control module controls the sewing machine to continuously keep the speed reduction sewing state after the buffering pre-judgment time T is timed;
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaAround the target voltage value UbFluctuating up and down and real-time voltage value UaAnd if the preset fluctuation range is exceeded all the time, the electronic control module controls the main motor in the sewing machine to increase the speed to the rotating speed before the speed is reduced after the buffering pre-judgment time T is timed, so that the sewing machine sews the sewing material in a normal sewing state before the speed is reduced.
Further, the fluctuation threshold UxThe value range is as follows: U3-Ub<Ux<U3-U4, wherein U3 is the voltage value output by the Hall sensor when the feed dog is at the lowest point after the sewing material is put in the lower part of the middle presser foot of the sewing machine, and U4 is the voltage value output by the Hall sensor when the feed dog is at the highest point after the sewing material is put in the lower part of the middle presser foot of the sewing machine.
Further, the Hall sensor is fixed on the head part of the sewing machine shell.
Further, the hall sensor is a linear hall sensor.
Further, the real-time voltage value U output by the Hall sensoraInversely proportional to the thickness value of the seam material.
As described above, the sewing control method based on the seam material thickness detection according to the present invention has the following beneficial effects:
the electronic control module detects that the thickness of the sewing material changes when the sewing material is sewn, and particularly when the sewing material becomes thick, the real-time voltage value U is analyzed within a subsequent buffer prejudging time TaThe change of the speed reducing device finally controls the sewing machine to sew the sewing material in a normal sewing state when the speed is not reduced or sew the sewing material in a speed reducing sewing state after the speed is reduced, thereby eliminating the detection fluctuation error caused by the up-and-down lifting of the feed dog, effectively avoiding the error execution of the speed reducing control by the electric control module and enabling the working state of the sewing machine to be more stable.
Drawings
Fig. 1 is a corresponding relationship between the distance between the hall sensor and the magnet and the voltage output by the hall sensor in four states of the sewing machine.
Fig. 2 is a schematic diagram of a first embodiment of a sewing control method based on seam material thickness detection in the present application.
Fig. 3 is a schematic diagram of a second embodiment of the sewing control method based on the thickness detection of the sewing material in the present application.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.
The application relates to a sewing machine, wherein a sewing material thickness detection unit is installed in the sewing machine, the sewing material thickness detection unit comprises a Hall sensor with a fixed position and a magnet fixed on a presser foot arm, and the Hall sensor can sense the magnet and is connected with an electric control module in the sewing machine; in this embodiment, the hall sensor is fixed to the head portion of the sewing machine housing, and the hall sensor is a linear hall sensor.
As shown in fig. 1, the state when the sewing machine does not sew the sewing material and the feed dog in the sewing machine is located at the lowest point is set as the first state of the sewing machine, in this state, there is no sewing material below the presser foot of the sewing machine, at this time, the distance between the hall sensor and the magnet is L1, the magnetic induction intensity received by the hall sensor to the magnet is B1, the hall sensor converts the magnetic induction intensity B1 into a hall voltage value U1 and outputs the hall voltage value U1 to the electronic control module, namely: in the first state, the electric control module detects that the output voltage value of the Hall sensor is U1. Since the distance L1 between the hall sensor and the magnet is small, the magnetic induction B1 received by the hall sensor to the magnet is strong, and accordingly, the hall voltage value U1 output by the hall sensor is also large.
The state that when not sewing the sewing material with the sewing machine and the feed dog in the sewing machine is located the peak is established as sewing machine's second state, under this state, sewing machine presser foot below also does not have the sewing material, but feed dog upwards jack-up a distance with the presser foot, the presser foot arm that is connected with the presser foot has appeared lifting and moving, drive magnet and move up together, make the distance between hall sensor and the magnet change, at this moment, the distance between hall sensor and the magnet is L2, the magnetic induction that hall sensor received magnet is B2, hall sensor converts the magnetic induction for B2 into hall magnitude of voltage U2 and exports hall magnitude of voltage U2 for electric control module, promptly: in the second state, the electric control module detects that the output voltage value of the Hall sensor is U2. The distance L2 is greater than the distance L1, the magnetic induction intensity is B2 and less than the magnetic induction intensity is B1, and the Hall voltage value U2 and less than the Hall voltage value U1.
Putting a sewing material below a presser foot of the sewing machine, wherein the thickness of the sewing material is L, and L is more than L2; assuming that the thickness of the sewing material is unchanged under the pressure of the presser foot, setting the state of the sewing machine when the sewing material is sewn and the feed dog in the sewing machine is located at the lowest point as the third state of the sewing machine, wherein the sewing material with a certain thickness is arranged below the presser foot of the sewing machine, at the moment, the distance between the Hall sensor and the magnet is L3, the magnetic induction intensity received by the Hall sensor is B3, the Hall sensor converts the magnetic induction intensity B3 into a Hall voltage value U3 and outputs the Hall voltage value U3 to the electric control module, namely: in the third state, the electric control module detects that the output voltage value of the Hall sensor is U3.
The state when setting sewing machine sewing material and the feed dog in the sewing machine when being located the peak is the fourth state of sewing machine, under this state, the below of sewing machine presser foot has the sewing material of certain thickness, combine feed dog with the presser foot distance of jack-up that makes progress, at this moment, the distance between hall sensor and the magnet is L4, the magnetic induction intensity that the hall sensor received magnet is B4, hall sensor converts the magnetic induction intensity for B4 into hall magnitude of voltage U4 and exports hall magnitude of voltage U4 to electric control module, promptly: in the fourth state, the electric control module detects that the output voltage value of the Hall sensor is U4.
Of the above four states, L1<L2<L3<L4, corresponding to B1>B2>B3>B4, correspondingly, U1>U2>U3>U4. Therefore, the real-time Hall voltage value output by the Hall sensor (i.e. the real-time voltage value U described below)a) The real-time Hall voltage value output by the Hall sensor is inversely proportional to the real-time thickness of the sewing material, namely: real-time voltage value U output by Hall sensor when sewing material is thickeraThe smaller. Real-time voltage value U output by Hall sensoraThe range of (A) is as follows: u4 is less than or equal to Ua≤U1。
In order to match the rotating speed of the main motor of the sewing machine with the thickness of the sewing material and improve the sewing performance of the sewing machine, a target voltage value U is preset in the electric control modulebThe target voltage value UbCorresponding to the thick material standard value Lb, when the electric control module detects the real-time voltage value U output by the Hall sensoraLess than the target voltage value UbWhen the sewing material thickness is increased and thickened, the electronic control module controls the main motor to execute speed reduction, the speed reduction is carried out from the original first rotating speed to the second rotating speed, and the electronic control module controls the main motor to output at the second rotating speed after speed reduction, so that the sewing machine sews the sewing material in the speed reduction sewing state. When the electric control module detects the real-time voltage value U output by the Hall sensoraGreater than or equal to the target voltage value UbWhen the sewing machine is in a normal sewing state, the electric control module controls the main motor not to reduce the speed, namely the electric control module controls the main motor to output at the first rotating speed so as to enable the sewing machine to continuously keep the normal sewing state. However, when the target voltage value U is setbJust between U3 and U4, i.e.: u4<Ub<U3, there will be a real-time voltage value U output by the Hall sensoraAround the target voltage value UbFluctuating up and down, i.e. real-time voltage value UaIs less than the target voltage value U for a momentbReal time voltage value UaIs once more than the target voltage value UbAt the moment, the electronic control module can frequently control the main motor to slow down and speed up, so that the driving signal output by the electronic control module to the main motor fluctuates in real time, and the rotating speed of the sewing machine is very unstable.
In order to avoid the above situation, the present application provides a sewing control method based on the thickness detection of the sewing material, and the sewing control method preferably has the following two embodiments.
As shown in fig. 2, a first embodiment of a sewing control method based on seam material thickness detection includes the following steps:
and step S1, arranging a Hall sensor with a fixed position and a magnet fixed on the presser foot arm, wherein the Hall sensor can sense the magnet and is connected with an electric control module in the sewing machine.
Step S2, except presetting the target voltage value U in the electric control modulebBesides, a fluctuation threshold U is preset in the electric control modulexAnd a buffering prejudgment time T, wherein the buffering prejudgment time T is a specific value determined and set by the actual working condition of the sewing machine, and the fluctuation threshold UxIs a numerical value manually input to the electronic control module.
Step S3, when the sewing machine sews the sewing material, the electric control module detects the real-time voltage value U output by the Hall sensoraSaid real-time voltage value UaThe real-time thickness of the sewing material is represented; the electric control module judges the real-time voltage value UaWhether or not it is less than the target voltage value UbIf yes, the following step S4 is executed, otherwise, the electric control module controls the main motor to keep the normal sewing state.
Step S4, when the first real-time voltage value U appearsaLess than the target voltage value UbWhen the voltage is over, the electric control module immediately starts to time and times the full buffer pre-judgment time T, and simultaneously the electric control module starts to time according to the preset target voltage value UbAnd a fluctuation threshold UxAcquiring a preset fluctuation range, wherein the preset fluctuation range is Ub～Ub+Ux(ii) a The electric control module judges the real-time voltage value U in time T according to the bufferingaThe following control is performed. In the first condition, in the buffering pre-judging time T, if the electronic control module judges the real-time voltage value UaIs always less than the target voltage value UbAnd after the electronic control module times the buffer pre-judgment time T, the main motor in the sewing machine is controlled to be decelerated from the first rotating speed to the second rotating speed, so that the sewing machine sews the sewing material in a deceleration sewing state. In the second situation, in the buffering pre-judging time T, if the electric control module judges the real-time voltage value UaAround the target voltage value UbFluctuating up and down and having at least a real-time voltage value UaIn a preset fluctuation range, after the electric control module times the buffering pre-judgment time T, the main motor in the sewing machine is controlled to reduce the speed from the first rotating speed to the second rotating speed, so that the sewing machine sews the sewing material in a speed-reducing sewing state; at least a real-time voltage value UaWithin the preset fluctuation range, two situations are included again: 1. real-time voltage value UaThe fluctuation of the wave is always within a preset fluctuation range; 2. real-time voltage value UaThe fluctuation of the buffer is beyond the preset fluctuation range, but the buffer returns to the preset fluctuation range within the buffer pre-judging time T. In the third situation, in the buffering pre-judgment time T, if the electric control module judges the real-time voltage value UaAround the target voltage value UbFluctuating up and down and in real timeVoltage value UaAnd if the preset fluctuation range is exceeded all the time, the electric control module controls a main motor in the sewing machine to run at the first rotating speed after the buffering pre-judgment time T is timed out, and the normal sewing state is continuously kept.
As shown in fig. 3, the second embodiment of the sewing control method based on the seam material thickness detection includes the following steps:
and step Z1, arranging a Hall sensor with a fixed position and a magnet fixed on the presser foot arm, wherein the Hall sensor can sense the magnet and is connected with an electric control module in the sewing machine.
Step Z2, presetting the target voltage value U in the electric control modulebBesides, a fluctuation threshold U is preset in the electric control modulexAnd a buffering prejudgment time T, wherein the buffering prejudgment time T is a specific value determined and set by the actual working condition of the sewing machine, and the fluctuation threshold UxIs a numerical value manually input to the electronic control module.
Step Z3, when the sewing machine sews the sewing material, the electric control module detects the real-time voltage value U output by the Hall sensoraSaid real-time voltage value UaThe real-time thickness of the sewing material is represented; the electric control module judges the real-time voltage value UaWhether or not it is less than the target voltage value UbIf yes, the following step S4 is executed, otherwise, the electric control module controls the main motor to keep the normal sewing state.
Step Z4, when the first real-time voltage value U appearsaLess than the target voltage value UbWhen the sewing machine is used, the electronic control module immediately controls the main motor in the sewing machine to reduce the speed from the first rotating speed to the second rotating speed so that the sewing machine sews the sewing material in a reduced-speed sewing state, meanwhile, the electronic control module starts timing and times the full buffer pre-judgment time T, and the electronic control module is used for judging the preset target voltage value U according to the preset target voltage value UbAnd a fluctuation threshold UxAcquiring a preset fluctuation range, wherein the preset fluctuation range is Ub～Ub+Ux(ii) a The electric control module judges the real-time voltage value U in time T according to the bufferingaThe following control is performed. In the first condition, in the buffering pre-judging time T, if the electronic control module judges the real-time voltage value UaIs always less than the target voltage valueUbAnd after the electric control module times the buffer pre-judgment time T, the main motor is controlled to run at a second rotating speed, and the sewing machine continues to sew the sewing material in a speed reduction sewing state. In the second situation, in the buffering pre-judging time T, if the electric control module judges the real-time voltage value UaAround the target voltage value UbFluctuating up and down and having at least a real-time voltage value UaWhen the electric control module times the buffering prejudgment time T within the preset fluctuation range, the main motor is controlled to run at a second rotating speed, and the sewing machine continues to sew the sewing material in a speed reduction sewing state; at least a real-time voltage value UaWithin the preset fluctuation range, two situations are included again: 1. real-time voltage value UaThe fluctuation of the wave is always within a preset fluctuation range; 2. real-time voltage value UaThe fluctuation of the buffer is beyond the preset fluctuation range, but the buffer returns to the preset fluctuation range within the buffer pre-judging time T. In the third situation, in the buffering pre-judgment time T, if the electric control module judges the real-time voltage value UaAround the target voltage value UbFluctuating up and down and real-time voltage value UaAnd if the preset fluctuation range is exceeded all the time, the electric control module controls the main motor in the sewing machine to increase the speed to the rotating speed before the speed reduction after the timing of the electric control module is over the buffering pre-judging time T, namely: the main motor is operated at a first rotational speed, and the sewing machine sews the sewing material in a normal sewing state before the speed is reduced.
Further, in two embodiments of the sewing control method based on the seam material thickness detection, the fluctuation threshold value U isxThe optimal value range is as follows: U3-Ub<Ux<U3-U4, wherein U3 is the voltage value output by the Hall sensor when the feed dog is at the lowest point after the sewing material is put in the lower part of the middle presser foot of the sewing machine, and U4 is the voltage value output by the Hall sensor when the feed dog is at the highest point after the sewing material is put in the lower part of the middle presser foot of the sewing machine.
Further, in the two embodiments of the sewing control method based on the seam material thickness detection, the second rotating speed output by the main motor after the speed reduction is preset in the electronic control module; in step S3 of the first sewing control method and step Z3 of the second sewing control method, when the electronic control module determines the real-time voltage UaLess than the target voltage value UbIf not, the electric control module controls the main motor to continuously keep a normal sewing state, and the main motor is output at the first rotating speed. Such as: the output of the main motor is set to be 5000 revolutions per minute when the thick material is met in the electric control module, namely the set second rotating speed is 5000 revolutions per minute, when the sewing machine runs and the pedal is stepped to the bottom, the first rotating speed output by the main motor in the sewing machine is 6000 revolutions per minute, and at the moment, when the electric control module judges the real-time voltage value UaLess than the target voltage value UbIf so, executing step S4 in the first sewing control method embodiment or executing step Z4 in the second sewing control method embodiment; however, when the sewing machine is operated but the pedal is not stepped on, the first rotating speed output by the main motor in the sewing machine is 4900 rpm or lower, and at the moment, the electronic control module judges the real-time voltage value UaLess than the target voltage value UbThe electronic control module controls the main motor to output at 4900 rpm or less.
To sum up, according to the sewing control method based on the sewing material thickness detection, when the electronic control module controls the rotating speed of the main motor according to the sewing material thickness, detection fluctuation errors caused by up-and-down movement of the feed dog are filtered, detection precision errors caused by softness and hardness of the fabric can also be filtered, the sewing machine can run more stably, sewing is more stable and practical, the experience of a user is greatly improved, and popularization and application of the sewing material thickness detection function on the sewing machine are really realized. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A sewing control method based on sewing material thickness detection is characterized by comprising the following steps:
s1, arranging a Hall sensor with a fixed position and a magnet fixed on the presser foot arm, wherein the Hall sensor can sense the magnet and is connected with an electric control module in the sewing machine;
s2, presetting a target voltage value U in the electric control modulebFluctuation threshold UxAnd buffering the anticipation time T;
s3, when the sewing machine sews the sewing material, the electric control module detects the real-time voltage value U output by the Hall sensoraSaid real-time voltage value UaThe real-time thickness of the sewing material is represented; the electric control module judges the real-time voltage value UaWhether or not it is less than the target voltage value UbIf yes, executing the following step S4, otherwise, controlling the main motor to keep the normal sewing state by the electric control module;
s4, the electric control module starts timing and times the full buffer pre-judgment time T, and meanwhile the electric control module obtains a preset fluctuation range which is Ub～Ub+Ux(ii) a The electric control module judges the real-time voltage value U in time T according to the bufferingaThe following controls are performed:
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaIs always less than the target voltage value UbIf the electronic control module times the buffering pre-judgment time T, the main motor in the sewing machine is controlled to reduce the speed, so that the sewing machine sews the sewing material in a speed-reduced sewing state;
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaAround the target voltage value UbFluctuating up and down and having at least a real-time voltage value UaIn a preset fluctuation range, the electronic control module controls the main motor in the sewing machine to decelerate after the buffering prejudgment time T is timed out, so that the sewing machine sews the sewing material in a decelerating sewing state;
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaAround the target voltage value UbFluctuating up and down and real-time voltage value UaAnd if the preset fluctuation range is exceeded all the time, the electric control module controls a main motor in the sewing machine to continuously keep a normal sewing state after the electric control module times the buffering pre-judgment time T.
2. The sewing control method according to claim 1, characterized in that: the fluctuation threshold UxThe value range is as follows: U3-Ub<Ux<U3-U4, wherein U3 is the voltage value output by the Hall sensor when the feed dog is at the lowest point after the sewing material is put in the lower part of the middle presser foot of the sewing machine, and U4 is the voltage value output by the Hall sensor when the feed dog is at the highest point after the sewing material is put in the lower part of the middle presser foot of the sewing machine.
3. The sewing control method according to claim 1, characterized in that: the Hall sensor is fixed on the head of the sewing machine shell.
4. The sewing control method according to claim 1, characterized in that: the Hall sensor is a linear Hall sensor.
5. The sewing control method according to claim 1, characterized in that: real-time voltage value U output by Hall sensoraInversely proportional to the thickness value of the seam material.
6. A sewing control method based on sewing material thickness detection is characterized by comprising the following steps:
the sewing machine comprises a Z1, a Hall sensor with a fixed setting position and a magnet fixed on a presser foot arm, wherein the Hall sensor can sense the magnet and is connected with an electric control module in the sewing machine;
z2, presetting a target voltage value U in the electric control modulebFluctuation threshold UxAnd buffering the anticipation time T;
z3, when the sewing machine sews the sewing material, the electric control module detects the real-time voltage value U output by the Hall sensoraWhat is, what isThe real-time voltage value UaThe real-time thickness of the sewing material is represented; the electric control module judges the real-time voltage value UaWhether or not it is less than the target voltage value UbIf yes, executing the following step S4, otherwise, controlling the main motor to keep the normal sewing state by the electric control module;
z4, the electric control module instantly controls the main motor in the sewing machine to slow down so that the sewing machine sews the sewing material in a slow down sewing state, meanwhile, the electric control module starts timing and times the buffering prejudgment time T, the electric control module obtains a preset fluctuation range, and the preset fluctuation range is Ub～Ub+Ux(ii) a The electric control module judges the real-time voltage value U in time T according to the bufferingaThe following controls are performed: if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaIs always less than the target voltage value UbIf the buffer pre-judgment time T is up, the electronic control module controls the sewing machine to continuously keep the speed reduction sewing state;
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaAround the target voltage value UbFluctuating up and down and having at least a real-time voltage value UaIn the preset fluctuation range, the electronic control module controls the sewing machine to continuously keep the speed reduction sewing state after the buffering pre-judgment time T is timed;
if the electronic control module judges the real-time voltage value U within the buffering pre-judging time TaAround the target voltage value UbFluctuating up and down and real-time voltage value UaAnd if the preset fluctuation range is exceeded all the time, the electronic control module controls the main motor in the sewing machine to increase the speed to the rotating speed before the speed is reduced after the buffering pre-judgment time T is timed, so that the sewing machine sews the sewing material in a normal sewing state before the speed is reduced.
7. The sewing control method according to claim 6, characterized in that: the fluctuation threshold UxThe value range is as follows: U3-Ub<Ux<U3-U4, wherein U3 is the voltage value output by Hall sensor when feed dog is at the lowest point after the sewing material is put under the middle presser foot of the sewing machine, and U4 is the voltage value output by Hall sensor when the sewing material is put under the middle presser foot of the sewing machineThe voltage value output by the Hall sensor at the high point.
8. The sewing control method according to claim 6, characterized in that: the Hall sensor is fixed on the head of the sewing machine shell.
9. The sewing control method according to claim 6, characterized in that: the Hall sensor is a linear Hall sensor.
10. The sewing control method according to claim 6, characterized in that: real-time voltage value U output by Hall sensoraInversely proportional to the thickness value of the seam material.
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