CN110820180A - Stitch length detecting method, stitch length detecting device, sewing machine, and readable storage medium - Google Patents
Stitch length detecting method, stitch length detecting device, sewing machine, and readable storage medium Download PDFInfo
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- CN110820180A CN110820180A CN201911190636.6A CN201911190636A CN110820180A CN 110820180 A CN110820180 A CN 110820180A CN 201911190636 A CN201911190636 A CN 201911190636A CN 110820180 A CN110820180 A CN 110820180A
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/22—Work-feeding means with means for setting length of stitch
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B55/00—Needle holders; Needle bars
- D05B55/10—Needle bars for multiple-needle sewing machines
- D05B55/12—Needle bars for multiple-needle sewing machines with provision for varying the distance between the needles
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/20—Control devices responsive to the number of stitches made
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Abstract
The invention provides a needle pitch detection method, which comprises the steps of detecting two limit swinging positions of a magnetic element by using a linear Hall element, and acquiring limit position voltage values respectively corresponding to the two limit swinging positions; acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element; and determining the swing angle of the cloth feeding shaft according to the angle limit difference between the two limit position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression. The stitch length detection method provided by the invention can detect the real-time stitch length value, has high reliability, and cannot be influenced by environmental factors such as dust and the like to cause failure.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to a stitch length detection method, a stitch length detection device, a sewing machine and a readable storage medium.
Background
In the clothing processing process, the actual needle pitch value of the sewing machine during operation needs to be obtained for the purposes of controlling the length of the wire braid, automatically adjusting the needle pitch and the like. The real-time detection of the needle pitch can be realized by methods such as a photoelectric encoder, but in practical application, the photoelectric encoder is easily affected by environmental factors such as dust and the like to fail, the detection precision is gradually reduced in the use process, and the reliability cannot be guaranteed.
Disclosure of Invention
In view of the above, it is desirable to provide a stitch length detecting method, a stitch length detecting device, a sewing machine and a readable storage medium.
The invention provides a stitch length detection method, which is applied to a sewing machine, wherein the sewing machine comprises a cloth feeding shaft, a linear Hall element and a magnetic element, the magnetic element is arranged on the cloth feeding shaft and can swing back and forth along with the cloth feeding shaft, and the linear Hall element is used for sensing the swing position of the magnetic element; the needle pitch detection method comprises the following steps:
detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
The stitch length detection method provided by the invention can detect the real-time stitch length value, has high reliability, and cannot be influenced by environmental factors such as dust and the like to cause failure.
In an embodiment of the present invention, since the mechanical structures of each sewing machine are slightly different, in order to ensure the accuracy of the stitch length detected in real time, the method for detecting the stitch length further includes, before the steps of detecting two extreme oscillating positions of the magnetic element by using the linear hall element and obtaining the voltage values of the extreme positions corresponding to the two extreme oscillating positions:
adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be capable of directly facing any magnetic pole of the magnetic element at a preset position;
and drawing the voltage-angle curve according to the angle value of the magnetic element and the corresponding detected voltage value of the linear Hall element.
By the arrangement, each sewing machine is initialized, and the precision of the needle pitch of each sewing machine monitored in real time is ensured.
In one embodiment of the present invention, in order to ensure the accuracy of initialization of the linear hall element, the step of adjusting the needle pitch of the sewing machine to the maximum and enabling the linear hall element to face any one magnetic pole of the magnetic element at a preset position includes:
adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be capable of rightly facing the N magnetic pole of the magnetic element at a preset position; alternatively, the first and second electrodes may be,
and adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be over against the S magnetic pole of the magnetic element at a preset position.
So set up, utilize magnetic element' S the N utmost point or the S utmost point to make linear Hall element initialize, the data that record have the extreme value, confirm the position that linear Hall element just is to the magnetic pole easily, it is more accurate when making linear Hall element initialize, guaranteed the accuracy of data when real-time detection gauge needle then.
In one embodiment of the invention, when the magnetic element is opposite to the linear hall element, the voltage value detected by the linear hall element is named as a positive voltage value; the step of obtaining the angle difference between the two extreme position voltage values according to the two extreme position voltage values and the voltage-angle curve of the linear hall element comprises: and if the linear Hall element can detect the opposite voltage value, determining the accumulated value of two angle deviation values between the two extreme position voltage values and the opposite voltage value as the angle difference.
With the arrangement, in the actual use process, even if the stitch length is adjusted, the moment that the cloth feeding shaft is over against the linear Hall element can be detected as the over-against voltage value, and then the angle difference is determined by the accumulated value of the two angle deviation values between the two extreme position voltage values and the over-against voltage value, so that the swinging angle of the cloth feeding shaft under the working state of the current stitch length can be obtained, and the data is simple and easy to obtain, accurate and small in error.
In an embodiment of the present invention, since the needle pitch of the sewing machine is adjusted at any time during the actual use process, and cannot be kept at the maximum value all the time, and it cannot be guaranteed that the cloth feeding shaft has a moment of facing the linear hall element, when the facing voltage value is not detected, the step of obtaining the angle difference between the two limit position voltage values according to the two limit position voltage values and the voltage-angle curve of the linear hall element includes:
and if the linear Hall element cannot detect the positive voltage value, determining the angle deviation value between the two extreme position voltage values as the angle difference.
According to the arrangement, the angle difference can be directly obtained by utilizing the angle deviation value between the two extreme position voltage values, so that the swinging angle of the cloth feeding shaft under the working state of the current needle pitch is obtained, the data is simple and easy to obtain, and the method is accurate and has small error.
In one embodiment of the invention, in order to realize the detection scheme with low cost and high precision, the magnetic element is annular magnetic steel which is sleeved on the cloth feeding shaft; the step of detecting the two extreme swing positions of the magnetic element by using the linear hall element and acquiring the extreme position voltage values corresponding to the two extreme swing positions respectively comprises the following steps:
and detecting two limit swing positions of the annular magnetic steel by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively.
According to the arrangement, the magnetic field can be supplied by utilizing the annular magnetic steel, the linear Hall element outputs different voltage values according to the difference of the magnetic field intensity, and the real-time detection data can be simply and visually obtained.
In an embodiment of the present invention, in order to make the linear hall element simpler and more accurate in converting the magnetic field strength into the voltage value, the stitch length detecting method further includes, before the step of detecting two extreme swing positions of the magnetic element by using the linear hall element and acquiring the extreme position voltage values corresponding to the two extreme swing positions, respectively:
and fixedly arranging the linear Hall element on the shell.
So set up, linear hall element rigidity can accurate detection magnetic field intensity and convert into corresponding magnitude of voltage, and linear hall effect sensor's output voltage can change according to magnetic field intensity accurately, and the gauge needle real-time detection error is little, and the reliability is high.
The invention also provides a needle pitch detection device, comprising:
the detection module is used for detecting two extreme swing positions of the magnetic element by using the linear Hall element and obtaining two corresponding voltage values;
the calculation module is used for acquiring the angle difference between the two extreme swing positions according to the voltage-angle curve of the current linear Hall element;
and the determining module is used for determining the swing angle of the cloth feeding shaft according to the angle difference between the two limit swing positions and then calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
The invention also provides a sewing machine, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the method when executing the computer program.
The invention also provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
Drawings
FIG. 1 is a flow chart of a method of stitch length detection in one embodiment of the present invention;
FIG. 2 is a voltage-angle curve of a linear Hall element in the stitch length detection method of FIG. 1;
FIG. 3 is a block diagram of a stitch length detecting device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a flowchart illustrating a needle pitch detection method according to an embodiment of the invention. The invention provides a needle pitch detection method which is applied to a sewing machine and used for detecting the needle pitch of the sewing machine in real time, so that real-time parameters are provided for production control of the sewing machine, and real-time needle pitch adjustment can be conveniently carried out by an operator and a control center, so that the sewing quality is improved.
In the present embodiment, the needle pitch detection method is used to detect the needle pitch value of the overedger in real time. It is understood that in other embodiments, the needle pitch detection method can also be applied to flat sewing machines, double-needle machines, buttonhole machines and other application occasions requiring real-time needle pitch value measurement.
Taking the overedger as an example, the overedger comprises a shell (not shown), a main shaft (not shown), a cloth feeding tooth (not shown) and a machine head (not shown), wherein the shell is used for bearing the main shaft, the cloth feeding tooth and the machine head, the main shaft is connected with a power source and can drive the cloth feeding shaft, the cloth feeding tooth and the machine head to operate under the driving of the power source, the cloth feeding shaft transmits the power of the main shaft to the cloth feeding tooth through mechanical connection and transmission, the cloth feeding tooth is used for conveying the cloth to be processed, and the machine head is used for sewing the cloth conveyed by the cloth feeding shaft. The main shaft drives the cloth feeding shaft to reciprocate, and the cloth feeding shaft drives the cloth feeding teeth to convey cloth in a reciprocating mode, so that the machine head can sew the cloth, and the sewing and overlocking process of the overedger is completed. When the cloth feeding tooth carries the cloth in a reciprocating mode, the distance of each reciprocating motion determines the conveying distance of the cloth to be processed, and therefore the needle pitch is determined. Therefore, the real-time needle pitch value can be obtained through the transmission relation of the mechanical structure only by measuring the real-time motion condition of the cloth feeding shaft.
The sewing machine to which the present invention is applied is not limited to the above-described connection relationship and movement process, and may be any sewing machine that can implement real-time detection of the needle pitch by applying the needle pitch detection method provided by the present invention. Of course, besides the above-mentioned housing, main shaft, cloth feeding dog and head, the sewing machine further includes a thread hooking mechanism, a thread taking-up mechanism, a thread winding mechanism, a lubricating mechanism, etc. to smoothly complete the sewing process, and no further description is given here.
The sewing machine comprises a cloth feeding shaft, a linear Hall element and a magnetic element, wherein the magnetic element is arranged on the cloth feeding shaft and can swing back and forth along with the cloth feeding shaft, and the linear Hall element is used for sensing the swing position of the magnetic element.
The needle pitch detection method provided by the invention comprises the following steps:
step S10, detecting two extreme swing positions of the magnetic element by using the linear hall element, and acquiring extreme position voltage values corresponding to the two extreme swing positions, respectively.
In particular, the linear hall element is a magnetic sensor based on the hall effect, the voltage output of the linear hall element accurately tracks the change of the magnetic flux density, and the magnetic field and the change thereof can be detected, and the linear hall element can be used in various fields related to the magnetic field. The linear Hall elements have many advantages, and they have firm structure, small volume, light weight, long service life, convenient installation, low power consumption, high frequency, vibration resistance, and no fear of pollution or corrosion of dust, oil stain, water vapor, salt mist and the like.
When the magnetic element swings back and forth along with the cloth feeding shaft, the linear Hall element can cut the magnetic induction line to generate the change of the magnetic field intensity, so as to output different voltage values, and the linear Hall element is used for detecting the voltage values of the limit positions corresponding to the two limit swinging positions of the magnetic element respectively, namely detecting the voltage values of the limit positions corresponding to the two limit swinging positions of the cloth feeding shaft when the cloth feeding shaft swings back and forth; the swing angle of the cloth feeding shaft during reciprocating swing determines the conveying distance of the cloth to be processed conveyed by the cloth feeding teeth, so that the needle pitch is determined.
In step S20, an angle difference between the two extreme position voltage values is obtained according to the two extreme position voltage values and the voltage-angle curve of the linear hall element.
Specifically, the voltage-angle curve of the linear hall element is preset, and the extreme position voltage values are substituted into the voltage-angle curve to obtain the angle difference between the two extreme position voltage values, knowing the voltage-angle curve of the linear hall element. It can be understood that the voltage-angle curve of the linear hall element can also be fitted in real time, and the voltage-angle curve is obtained after the real-time fitting, and then the voltage-angle curve is used according to the steps.
And step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
Specifically, the preset relational expression is determined by the connection relation and the transmission relation of the mechanical structure, and in detail, the preset relational expression is determined by the connection relation and the transmission relation between the cloth feeding shaft and the cloth feeding teeth, so that the preset relational expression can be set according to each sewing machine, the precision is high, the preset relational expression can also be set for a batch of sewing machines with the same structure, and the setting cost is low.
The magnetic element is arranged on the cloth feeding shaft and swings back and forth along with the cloth feeding shaft, in the process that the magnetic element swings back and forth along with the cloth feeding shaft, the linear Hall element can cut the magnetic induction line and detect the change of a magnetic field, corresponding voltage is output based on the Hall induction principle to determine the position of the magnetic element, so that the position of the cloth feeding shaft is determined, then the cloth feeding shaft and the cloth feeding teeth have a fixed transmission ratio according to mechanical connection of a sewing machine, and after the swinging distance of the cloth feeding shaft is determined, the distance for the cloth feeding teeth to convey every period can be determined, so that the needle pitch is determined.
At this time, the needle pitch detection method provided by the present invention includes:
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
The stitch length detection method provided by the invention can detect the magnetic field intensity by utilizing the characteristic that the linear Hall element can detect the real-time stitch length value, has high reliability and cannot be influenced by environmental factors such as dust and the like to fail.
Referring to fig. 2, fig. 2 is a voltage-angle curve of the linear hall element in the pitch detection method of fig. 1.
In an embodiment of the present invention, since the mechanical structure of each sewing machine is slightly different, in order to ensure the accuracy of the real-time detected needle pitch, the linear hall element is initialized, and before step S10, the needle pitch detecting method further includes:
step S01, the needle pitch of the sewing machine is adjusted to the maximum, and the linear hall element is allowed to face any one magnetic pole of the magnetic element at a predetermined position.
Specifically, when the cloth feeding shaft is in a natural stop state, the linear Hall element is over against any magnetic pole of the magnetic element; of course, the linear hall element can be opposite to any magnetic pole of the magnetic element when the cloth feeding shaft is in other states.
And step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the corresponding detected voltage value of the linear Hall element.
Specifically, each angle value of the magnetic element corresponds to a voltage value detected by the linear Hall element, so as to draw a voltage-angle curve of the sewing machine.
When the linear Hall element is initialized, the needle pitch of the sewing machine is adjusted to be maximum, and the swing angle of the cloth feeding shaft is maximum at the moment; when the stitch length is adjusted to be small in the actual use process, the swing angle of the cloth feeding shaft is reduced, the swing path is partially overlapped with the swing path of the cloth feeding shaft when the stitch length is the maximum, therefore, after the initialization setting, the voltage value of the cloth feeding shaft detected by the Hall element at each swing angle is accurate, and the measured real-time stitch length is also accurate.
At this time, the needle pitch detection method provided by the present invention includes:
step S01, the needle pitch of the sewing machine is adjusted to the maximum, and the linear Hall element can be just opposite to any magnetic pole of the magnetic element at the preset position;
step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the voltage value detected by the linear Hall element;
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
By the arrangement, each sewing machine can have an initial value corresponding to the voltage-angle curve drawn, each sewing machine can be initialized, and the accuracy of the needle pitch monitored by each sewing machine in real time is guaranteed.
In one embodiment of the present invention, in order to ensure the accuracy of the initialization of the linear hall element, step S01 includes:
step S011, the needle pitch of the sewing machine is adjusted to be maximum, and the linear Hall element can be just opposite to the N magnetic pole of the magnetic element at the preset position. Alternatively, step S01 may further include step S012,
and step S012, adjusting the needle pitch of the sewing machine to the maximum, and enabling the linear Hall element to be opposite to the S magnetic pole of the magnetic element at the preset position.
Specifically, the linear Hall element is initialized, wherein the initialization of the linear Hall element comprises the step of adjusting the needle pitch of the sewing machine to be maximum, and the linear Hall element can be enabled to be opposite to the N magnetic pole or the S magnetic pole of the magnetic element at a preset position; the N pole in the magnetic assembly is over against the linear Hall element to measure the maximum voltage and is marked as A + b; and (3) the S pole in the magnetic assembly is over against the linear Hall element to measure the minimum voltage value which is marked as-A + b, and a voltage-angle curve of the linear Hall element is determined, wherein A is the amplitude value, and b is the translation constant.
The voltage value measured when the N-pole of the magnetic element faces the linear hall element and the voltage value measured when the S-pole of the magnetic element faces the linear hall element can be measured separately, but the relative position of the magnetic pole of the magnetic element and the linear hall element should be unchanged.
At this time, the needle pitch detection method provided by the present invention includes:
step S011, adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be over against the N magnetic pole of the magnetic element at a preset position; alternatively, the first and second electrodes may be,
step S012, adjusting the needle pitch of the sewing machine to the maximum, and enabling the linear Hall element to be over against the S magnetic pole of the magnetic element at the preset position;
step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the voltage value detected by the linear Hall element;
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
So set up, utilize magnetic element' S the N utmost point or the S utmost point to make linear Hall element initialize, the data that record have the extreme value, confirm the position that linear Hall element just is to the magnetic pole easily, it is more accurate when making linear Hall element initialize, guaranteed the accuracy of data when real-time detection gauge needle then.
In one embodiment of the invention, when the magnetic element is opposite to the linear hall element, the voltage value detected by the linear hall element is named as a positive voltage value;
in the method for detecting the needle pitch provided by the present invention, step S10 includes:
in step S11, if the linear hall element can detect the facing voltage value, an accumulated value of two angular deviation values between the two limit position voltage values and the facing voltage value is determined as the angular difference.
If in the actual use process, even if the stitch length is adjusted, the cloth feeding shaft has the moment of facing the linear Hall element, and the facing voltage value can be detected, then the angle difference is determined by the accumulated value of two angle deviation values between the two extreme position voltage values and the facing voltage value, the swinging angle of the cloth feeding shaft in the working state of the current stitch length can be obtained, the data is simple and easy to obtain, and the method is accurate and has small error.
In one embodiment of the present invention, step S10 further includes:
in step S12, if the linear hall element fails to detect a positive voltage value, an angular deviation value between the two limit position voltage values is determined as an angular difference.
In the actual use process, the needle pitch of the sewing machine can be adjusted at any time and cannot be kept at the maximum value all the time, so that the moment that the cloth feeding shaft is over against the linear Hall element cannot be guaranteed, and therefore when the over-against voltage value is not detected, the angle difference can be directly obtained by utilizing the angle deviation value between the voltage values of the two limit positions, the swinging angle of the cloth feeding shaft under the working state of the current needle pitch is obtained, the data is simple and easy to obtain, and the method is accurate and small in error.
In detail, the linear hall element detects that the voltage value measured when the magnetic assembly moves to the leftmost end in the reciprocating process of the magnetic assembly is recorded as y1The angular value of the rotation of the magnetic assembly with respect to the initial position is denoted x1(ii) a When the magnetic assembly moves to the rightmost end, the measured voltage value is recorded as y2And the angle of rotation of the magnetic assembly relative to the initial position is denoted x2；
Calculating the angular difference, and if the linear Hall element detects A + b during the reciprocating motion of the magnetic assembly, the angular difference △ x is | x1-π/2|+|x2-pi/2 |, if the linear hall element detects-a + b, the angular difference △ x ═ x |1-3π/2|+|x2-3 pi/2 |, if A + b or-A + b is not detected, the angular difference △ x ═ x |1-x2|。
That is to say, under the operating condition of present gauge length, no matter linear hall element can detect the positive voltage value, all can obtain the real-time swing angle of work feed shaft, detect the flexibility height to extensive applicability.
At this time, the needle pitch detection method provided by the present invention includes:
step S011, adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be over against the N magnetic pole of the magnetic element at a preset position; alternatively, the first and second electrodes may be,
step S012, adjusting the needle pitch of the sewing machine to the maximum, and enabling the linear Hall element to be over against the S magnetic pole of the magnetic element at the preset position;
step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the voltage value detected by the linear Hall element;
step S11, if the linear Hall element can detect the positive voltage value, determining the accumulated value of two angle deviation values between the two extreme position voltage values and the positive voltage value as the angle difference;
step S12, if the linear Hall element can not detect the positive voltage value, determining the angle deviation value between the two extreme position voltage values as the angle difference;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
According to the arrangement, the angle difference can be directly obtained by utilizing the angle deviation value between the two extreme position voltage values, so that the swing angle of the cloth feeding shaft under the working state of the current needle pitch is obtained, the data is simple and easy to obtain, and the method is accurate and has small error.
In an embodiment of the present invention, in order to implement the detection scheme with low cost and high precision, the magnetic element is an annular magnetic steel, the annular magnetic steel is sleeved on the cloth feeding shaft, and the step S10 includes:
and S101, detecting two limit swing positions of the annular magnetic steel by using a linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively.
At this time, the needle pitch detection method provided by the present invention includes:
step S101, detecting two limit swing positions of the annular magnetic steel by using a linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
According to the arrangement, the magnetic field can be supplied by utilizing the annular magnetic steel, the linear Hall element outputs different voltage values according to the difference of the magnetic field intensity, and the real-time detection data can be simply and visually obtained.
In an embodiment of the present invention, in order to make the linear hall element simpler and more accurate in converting the magnetic field strength into the voltage value, the needle pitch detection method further includes, before step S10:
and S001, fixedly arranging the linear Hall element on the shell.
It can be understood that the linear hall element may be fixed to the housing, or may be fixed to another position, as long as the linear hall element can detect the magnetic field strength of the magnetic element.
It is understood that the linear hall element is directly fixed to the housing, or may be fixed to a circuit board fixed to the housing.
At this time, the needle pitch detection method provided by the present invention includes:
s001, fixedly arranging a linear Hall element on a shell;
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
So set up, linear hall element rigidity can accurate detection magnetic field intensity and convert into corresponding magnitude of voltage, and linear hall effect sensor's output voltage can change according to magnetic field intensity accurately, and the gauge needle real-time detection error is little, and the reliability is high.
Referring to fig. 3, fig. 3 is a block diagram of a needle pitch detecting device according to the present invention.
The invention also provides a needle pitch detection device, which comprises:
the detection module is used for detecting two extreme swing positions of the magnetic element by using the linear Hall element and obtaining two corresponding voltage values;
the calculation module is used for acquiring the angle difference between the two extreme swing positions according to the voltage-angle curve of the current linear Hall element;
and the determining module is used for determining the swing angle of the cloth feeding shaft according to the angle difference between the two limit swing positions and then calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
For the specific definition of the needle pitch detection device, reference may be made to the definition of the needle pitch detection method above, and details are not repeated here. The modules in the needle distance detection device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment of the present invention, a sewing machine is provided, which may be a server. The sewing machine includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the sewing machine is configured to provide computing and control capabilities. The memory of the sewing machine comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the sewing machine is used for storing the needle pitch detection data. The network interface of the sewing machine is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a method of stitch detection.
In one embodiment, a sewing machine is provided, which may be a terminal. The sewing machine comprises a processor, a memory, a network interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the sewing machine is configured to provide computing and control capabilities. The memory of the sewing machine comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the sewing machine is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a method of stitch detection. The display screen of the sewing machine can be a liquid crystal display screen or an electronic ink display screen, and the input device of the sewing machine can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the sewing machine, an external keyboard, a touch pad or a mouse and the like.
The invention also provides a sewing machine, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to realize the following steps:
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
step S01, the needle pitch of the sewing machine is adjusted to the maximum, and the linear Hall element can be just opposite to any magnetic pole of the magnetic element at the preset position;
step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the voltage value detected by the linear Hall element;
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
step S011, adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be over against the N magnetic pole of the magnetic element at a preset position; alternatively, the first and second electrodes may be,
step S012, adjusting the needle pitch of the sewing machine to the maximum, and enabling the linear Hall element to be over against the S magnetic pole of the magnetic element at the preset position;
step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the voltage value detected by the linear Hall element;
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
step S011, adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be over against the N magnetic pole of the magnetic element at a preset position; alternatively, the first and second electrodes may be,
step S012, adjusting the needle pitch of the sewing machine to the maximum, and enabling the linear Hall element to be over against the S magnetic pole of the magnetic element at the preset position;
step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the voltage value detected by the linear Hall element;
step S11, if the linear Hall element can detect the positive voltage value, determining the accumulated value of two angle deviation values between the two extreme position voltage values and the positive voltage value as the angle difference;
in step S12, if the linear hall element fails to detect a positive voltage value, an angular deviation value between the two limit position voltage values is determined as an angular difference.
Step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
step S101, detecting two limit swing positions of the annular magnetic steel by using a linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
s001, fixedly arranging a linear Hall element on a shell;
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
The present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the computer program when executed by the processor further performs the steps of:
step S01, the needle pitch of the sewing machine is adjusted to the maximum, and the linear Hall element can be just opposite to any magnetic pole of the magnetic element at the preset position;
step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the voltage value detected by the linear Hall element;
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the computer program when executed by the processor further performs the steps of: step S011, adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be over against the N magnetic pole of the magnetic element at a preset position; alternatively, the first and second electrodes may be,
step S012, adjusting the needle pitch of the sewing machine to the maximum, and enabling the linear Hall element to be over against the S magnetic pole of the magnetic element at the preset position;
step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the voltage value detected by the linear Hall element;
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the computer program when executed by the processor further performs the steps of:
step S011, adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be over against the N magnetic pole of the magnetic element at a preset position; alternatively, the first and second electrodes may be,
step S012, adjusting the needle pitch of the sewing machine to the maximum, and enabling the linear Hall element to be over against the S magnetic pole of the magnetic element at the preset position;
step S02, drawing a voltage-angle curve according to the angle value of the magnetic element and the voltage value detected by the linear Hall element;
step S11, if the linear Hall element can detect the positive voltage value, determining the accumulated value of two angle deviation values between the two extreme position voltage values and the positive voltage value as the angle difference;
step S12, if the linear Hall element can not detect the positive voltage value, determining the angle deviation value between the two extreme position voltage values as the angle difference;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the computer program when executed by the processor further performs the steps of:
step S101, detecting two limit swing positions of the annular magnetic steel by using a linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
In one embodiment, the computer program when executed by the processor further performs the steps of:
s001, fixedly arranging a linear Hall element on a shell;
step S10, detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
step S20, acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and step S30, determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The stitch length detection method provided by the invention can detect the real-time stitch length value, has high reliability, and cannot be influenced by environmental factors such as dust and the like to cause failure.
The features of the above embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be construed as being within the scope of the present specification as long as there is no contradiction between the combinations of the features.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.
Claims (10)
1. A stitch length detection method is applied to a sewing machine and is characterized in that the sewing machine comprises a cloth feeding shaft, a linear Hall element and a magnetic element, wherein the magnetic element is arranged on the cloth feeding shaft and can swing back and forth along with the cloth feeding shaft, and the linear Hall element is used for sensing the swing position of the magnetic element; the needle pitch detection method comprises the following steps:
detecting two limit swing positions of the magnetic element by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively;
acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values, and calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
2. The needle pitch detection method according to claim 1, further comprising, before the step of detecting two extreme swing positions of the magnetic element by using the linear hall element and acquiring extreme position voltage values corresponding to the two extreme swing positions, respectively:
adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be capable of directly facing any magnetic pole of the magnetic element at a preset position;
and drawing the voltage-angle curve according to the angle value of the magnetic element and the corresponding detected voltage value of the linear Hall element.
3. The needle pitch detecting method according to claim 2, wherein the step of adjusting the needle pitch of the sewing machine to the maximum and allowing the linear hall element to face any one magnetic pole of the magnetic element at a preset position comprises:
adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be capable of rightly facing the N magnetic pole of the magnetic element at a preset position; alternatively, the first and second electrodes may be,
and adjusting the needle pitch of the sewing machine to be maximum, and enabling the linear Hall element to be over against the S magnetic pole of the magnetic element at a preset position.
4. The needle pitch detecting method according to claim 1, wherein when the magnetic element is opposed to the linear hall element, a voltage value detected by the linear hall element is named as a facing voltage value; the step of obtaining the angle difference between the two extreme position voltage values according to the two extreme position voltage values and the voltage-angle curve of the linear hall element comprises: and if the linear Hall element can detect the opposite voltage value, determining the accumulated value of two angle deviation values between the two extreme position voltage values and the opposite voltage value as the angle difference.
5. The needle pitch detection method of claim 4, wherein said step of obtaining an angular difference between two of said extreme position voltage values from said two extreme position voltage values and a voltage-angle curve of said linear Hall element comprises:
and if the linear Hall element cannot detect the positive voltage value, determining the angle deviation value between the two extreme position voltage values as the angle difference.
6. The needle pitch detection method according to claim 1, wherein the magnetic element is an annular magnetic steel sleeve, and the annular magnetic steel sleeve is arranged on the cloth feeding shaft; the step of detecting the two extreme swing positions of the magnetic element by using the linear hall element and acquiring the extreme position voltage values corresponding to the two extreme swing positions respectively comprises the following steps:
and detecting two limit swing positions of the annular magnetic steel by using the linear Hall element, and acquiring limit position voltage values corresponding to the two limit swing positions respectively.
7. The needle pitch detecting method according to claim 1, wherein the sewing machine further comprises a housing, and the needle pitch detecting method further comprises, before the step of detecting two extreme oscillating positions of the magnetic element by using the linear hall element and acquiring extreme position voltage values corresponding to the two extreme oscillating positions, respectively:
and fixedly arranging the linear Hall element on the shell.
8. A gauge detection apparatus, the apparatus comprising:
the detection module is used for detecting two extreme swing positions of the magnetic element by using the linear Hall element and obtaining two corresponding voltage values;
the calculation module is used for acquiring an angle difference between the two extreme position voltage values according to the two extreme position voltage values and a voltage-angle curve of the linear Hall element;
and the determining module is used for determining the swing angle of the cloth feeding shaft according to the angle difference between the two extreme position voltage values and then calculating the needle pitch corresponding to the current swing angle according to a preset relational expression.
9. A sewing machine comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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