CN112301562B - Sewing machine control method, device, equipment and storage medium - Google Patents

Sewing machine control method, device, equipment and storage medium Download PDF

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Publication number
CN112301562B
CN112301562B CN202011176321.9A CN202011176321A CN112301562B CN 112301562 B CN112301562 B CN 112301562B CN 202011176321 A CN202011176321 A CN 202011176321A CN 112301562 B CN112301562 B CN 112301562B
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Prior art keywords
cloth
angle
value
angle range
determining
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CN112301562A (en
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刘鹏
孔宪旭
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Zhuji Xingdahao Technology Development Co ltd
Beijing Dahao Industrial Sewing Intelligent Control Technology Co ltd
Beijing Dahao Technology Co Ltd
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Zhuji Xingdahao Technology Development Co ltd
Beijing Dahao Industrial Sewing Intelligent Control Technology Co ltd
Beijing Dahao Technology Co Ltd
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B19/00Programme-controlled sewing machines
    • D05B19/02Sewing machines having electronic memory or microprocessor control unit
    • D05B19/04Sewing machines having electronic memory or microprocessor control unit characterised by memory aspects
    • D05B19/10Arrangements for selecting combinations of stitch or pattern data from memory ; Handling data in order to control stitch format, e.g. size, direction, mirror image
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B19/00Programme-controlled sewing machines
    • D05B19/02Sewing machines having electronic memory or microprocessor control unit
    • D05B19/12Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B19/00Programme-controlled sewing machines
    • D05B19/02Sewing machines having electronic memory or microprocessor control unit
    • D05B19/12Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
    • D05B19/16Control of workpiece movement, e.g. modulation of travel of feed dog
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B69/00Driving-gear; Control devices
    • D05B69/10Electrical or electromagnetic drives

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

The embodiment of the invention provides a sewing machine control method, a device, equipment and a storage medium, wherein the method comprises the steps of determining a cloth thickness value according to an acquired voltage signal, and determining a feeding needle distance and a medium presser foot amplitude according to acquired pattern data; determining a first angle range and a second angle range according to the cloth thickness value, and determining the rotating speed of the spindle motor according to the first angle range, the second angle range, the feeding needle distance and the medium presser foot amplitude; the spindle motor is controlled according to the rotating speed, the feeding motor is controlled according to the first angle range, the determined rotating speed is suitable for the thickness and the pattern of the current sewing cloth, the determined rotating speed is accurate, the feeding mechanism and the middle presser foot can be controlled according to the determined angle range, the sewing stitch can be adjusted along with the change of the cloth thickness, and the quality of the sewing stitch is improved.

Description

Sewing machine control method, device, equipment and storage medium
Technical Field
The embodiment of the invention relates to the technical field of sewing machines, in particular to a sewing machine control method, a sewing machine control device, sewing machine control equipment and a storage medium.
Background
In the process of sewing the cloth by the sewing machine, the thickness of the cloth has great influence on the sewing process, and when the thickness of the cloth changes, the control method of the sewing machine needs to be changed.
In the prior art, when the thickness of the cloth is changed, the rotating speed of the sewing machine can be adjusted by a manual method. For example, before sewing a pattern, a rotation speed value is obtained according to the thickness of the pattern, and then the rotation speed value is set in a program of a controller. However, when a pattern is sewn, different stitch lengths may need to be set, that is, different feeding stitch lengths and different widths of the middle presser foot need to be set, and the rotating speed of the sewing machine is affected when the feeding stitch length or the width of the middle presser foot is changed.
When the thickness of cloth changes among the prior art, only can control sewing machine according to the thickness of cloth to only can control single actuating mechanism among the sewing machine, and then lead to the stitch seam quality of sewing not good.
Disclosure of Invention
The embodiment of the invention provides a sewing machine control method, a sewing machine control device, equipment and a storage medium, and solves the problem that when the thickness of cloth is changed, the rotating speed of a sewing machine is not accurately controlled, and the quality of sewn stitches is poor.
In a first aspect, an embodiment of the present invention provides a sewing machine control method, including:
determining a cloth thickness value according to the acquired voltage signal, and determining a feeding needle distance and a medium presser foot amplitude according to the acquired pattern data; the voltage signal is a signal which is output by the cloth thickness sensor and represents the cloth thickness;
determining a first angle range and a second angle range according to the cloth thickness value; the first angle range represents the angle range of the corresponding spindle motor when the feeding mechanism executes actions; the second angle range represents the angle range of the corresponding spindle motor when the middle presser foot performs action;
determining the rotating speed of the spindle motor according to the first angle range, the second angle range, the feeding needle distance and the medium presser foot amplitude;
and controlling the spindle motor according to the rotating speed.
Optionally, determining the first angle range and the second angle range according to the cloth thickness value includes:
determining a cloth inlet angle and a cloth outlet angle corresponding to the cloth thickness value according to the cloth thickness value, the cloth inlet angle variation value and the cloth outlet angle variation value; the cloth feeding angle represents the angle of a corresponding spindle motor when a machine needle is inserted into cloth; the cloth discharging angle represents the angle of a corresponding spindle motor when the machine needle lifts cloth;
and determining a first angle range and a second angle range according to the cloth feeding angle, the cloth discharging angle and the cloth feeding angle which starts in advance.
Optionally, determining the rotation speed of the spindle motor according to the first angle range, the second angle range, the feeding needle pitch and the medium presser foot amplitude, includes:
determining the action time of the middle presser foot according to the amplitude of the middle presser foot; determining the action time of the feeding mechanism according to the feeding needle pitch;
determining a first rotating speed according to the action time of the feeding mechanism and the first angle range; determining a second rotating speed according to the action time of the middle presser foot and the second angle range;
and determining the smaller value of the first rotating speed and the second rotating speed as the rotating speed of the spindle motor.
Optionally, the method further includes:
acquiring a current angle value output by the spindle motor;
if the current angle value is a first numerical value, sending a work starting instruction to the feeding motor so as to enable the feeding mechanism to start to execute feeding action; if the current angle value is a second numerical value, a work stopping instruction is sent to the feeding motor, so that the feeding mechanism stops feeding;
the first numerical value is the angle of the spindle motor corresponding to the difference between the cloth discharging angle and the cloth feeding angle which is started in advance; the second value is the angle of the spindle motor corresponding to the cloth feeding angle.
Optionally, the second angle range includes an angle range of a pressing process and an angle range of a floating process, and a third value in the angle range of the pressing process is an angle of the corresponding spindle motor when the needle is at the highest point before entering the cloth; a fourth numerical value in the angle range of the pressing process is the cloth feeding angle; the fifth numerical value in the angle range in the floating process is the angle of the spindle motor corresponding to the difference between the cloth discharging angle and the cloth feeding angle started in advance; the sixth numerical value in the angle range in the floating process is the angle of the corresponding spindle motor when the needle is at the highest point after being discharged; the method further comprises the following steps:
acquiring a current angle value output by the spindle motor;
if the current angle value is a third value, a pressing starting instruction is sent to a middle presser foot motor so that the middle presser foot starts to execute pressing action; if the current angle value is a fourth numerical value, sending a pressing ending instruction to a middle presser foot motor so as to stop the middle presser foot from executing pressing action;
if the current angle value is a fifth numerical value, a floating starting instruction is sent to a middle presser foot motor so that the middle presser foot starts to perform floating action; and if the current angle value is a sixth numerical value, sending a floating finishing instruction to the middle presser foot motor so as to finish the floating action of the middle presser foot.
Optionally, the method further includes:
presetting a reference line tension value and a reference cloth thickness value corresponding to the cloth type according to the cloth type;
determining a linear tension value under the current cloth thickness according to the linear tension correction value, the reference line tension value and the reference cloth thickness value;
and sending the determined line tension value to a line tension motor so that the line tension motor adjusts the wire clamping device.
Optionally, before determining the first angle range and the second angle range according to the cloth thickness value, the method further includes:
when the thickness of the cloth is changed, determining the thickness change value of the cloth;
judging the relation between the cloth thickness variation value and a preset cloth thickness variation value;
correspondingly, determining a first angle range and a second angle range according to the cloth thickness value comprises the following steps:
and when the cloth thickness variation value is larger than a preset cloth thickness variation value, determining the first angle range and the second angle range according to the cloth thickness value.
In a second aspect, an embodiment of the present invention provides a sewing machine control apparatus, including:
the first determining module is used for determining a cloth thickness value according to the acquired voltage signal and determining a feeding needle distance and a medium presser foot amplitude according to the acquired pattern data; the voltage signal is a signal which is output by the cloth thickness sensor and represents the cloth thickness;
the second determining module is used for determining a first angle range and a second angle range according to the cloth thickness value; the first angle range represents the angle range of the corresponding spindle motor when the feeding mechanism executes actions; the second angle range represents the angle range of the corresponding spindle motor when the middle presser foot performs action;
the third determining module is used for determining the rotating speed of the spindle motor according to the first angle range, the second angle range, the feeding needle distance and the medium presser foot amplitude;
and the control module is used for controlling the spindle motor according to the rotating speed.
In a third aspect, an embodiment of the present invention provides a sewing machine control apparatus, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executes computer-executable instructions stored in the memory, causing the at least one processor to perform the method of controlling a sewing machine according to any of the first aspects.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, in which computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the method for controlling a sewing machine according to any one of the first aspect is implemented.
The method determines the thickness value of the cloth according to the acquired voltage signal, determines the feeding needle distance and the middle presser foot amplitude according to the acquired pattern data, and the voltage signal is a signal which is output by a cloth thickness sensor and represents the thickness of the cloth; determining a first angle range and a second angle range according to the cloth thickness value; the first angle range represents the angle range of the corresponding spindle motor when the feeding mechanism executes actions; the second angle range represents the angle range of the corresponding spindle motor when the middle presser foot performs action; the rotating speed of the spindle motor is determined according to the first angle range, the second angle range, the feeding needle distance and the middle presser foot amplitude, the spindle motor is controlled according to the rotating speed, the rotating speed of the sewing machine can be obtained based on the cloth thickness and the sewing pattern in the cloth sewing process, the determined rotating speed can better accord with the actual situation of sewing the cloth and the sewing pattern, the feeding mechanism and the middle presser foot can be further controlled according to the determined angle range, the sewing stitch can be adjusted along with the change of the cloth thickness, and the quality of the sewing stitch is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of a control method of a sewing machine according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for controlling a sewing machine according to an embodiment of the present invention;
FIG. 3 is a flow chart of another control method for a sewing machine according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a control device of a sewing machine according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware structure of the sewing machine control device according to the embodiment of 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 drawings in the embodiments of the present invention, and it is obvious 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic view of an application scenario of a control method of a sewing machine according to an embodiment of the present invention, as shown in fig. 1, the method is applied to a controller 101 of the sewing machine, the controller 101 may obtain a thickness value of a cloth from a cloth thickness sensor 102, obtain a feeding needle distance and a middle presser foot amplitude from a pattern program 103, obtain a control result through a control strategy in the controller 101, and control a spindle motor 104 and a feeding mechanism or a middle presser foot 105 through the control result. The pattern program 103 can be set through an operation panel, a user can select patterns to be sewn, and the operation panel can provide functions of setting the highest rotating speed and function configuration parameters of the sewing machine, detecting the system and the like. Meanwhile, the controller can also obtain an input signal of the pedal plate, and the sewing action can be started or stopped through the input signal.
In the prior art, when the thickness of the cloth is changed, the rotating speed of the sewing machine can be manually set only by a manual method, for example, when the thickness of the cloth is d1, the rotating speed is set to be v 1; when the cloth thickness is d2, the set rotation speed is v 2. The manual control method has the defect of complex operation, and data is reset once when the thickness of the cloth is changed. In addition, in the sewing process, the action of the machine needle is also related to the action of the feeding mechanism and the middle presser foot, when the machine needle executes the action, the feeding mechanism must be ensured to finish the feeding action, and the middle presser foot finishes the pressing action, namely the feeding mechanism drives an outer pressing frame of the sewing machine to drive the cloth to move in the X direction or the Y direction by the length of the feeding needle distance; the middle presser foot mechanism moves the middle presser foot by the amplitude distance before the sewing needle penetrates into the cloth, so that the rotating speed of the spindle motor is also related to the feeding needle distance and the middle presser foot amplitude in the pattern data. The rotation speed determined in the prior art without considering the above factors may not be suitable for the actual sewing situation.
In view of the above, an embodiment of the present invention provides a method for controlling a sewing machine, which includes monitoring a cloth thickness in real time according to a cloth thickness sensor, determining a feeding needle distance and a medium presser foot amplitude according to acquired pattern data, and determining a first angle range and a second angle range according to the cloth thickness; the first angle range and the second angle range respectively represent the angle range of the corresponding spindle motor when the feeding mechanism executes action and the angle range of the corresponding spindle motor when the middle presser foot executes action, and the rotating speed is determined according to the two angle ranges, the feeding needle pitch and the middle presser foot amplitude, so that the cloth thickness can be monitored in real time when the cloth is sewn, the rotating speed of the sewing machine can be adjusted in real time according to the sewing pattern and the cloth thickness, and the quality of sewing stitches can be further improved.
Fig. 2 is a flowchart of a control method of a sewing machine according to an embodiment of the present invention, which can be executed by a controller of the sewing machine. As shown in fig. 2, the method of this embodiment may include:
s201: determining a cloth thickness value according to the acquired voltage signal, and determining a feeding needle distance and a medium presser foot amplitude according to the acquired pattern data; the voltage signal is a signal which is output by the cloth thickness sensor and represents the cloth thickness.
The cloth thickness sensor is arranged on a support of an outer pressing frame of a sewing machine head, and can detect the cloth thickness of the current sewing position of the needle in real time. The output signal of the cloth thickness sensor is a voltage signal, and after the controller receives the voltage signal, the cloth thickness value can be obtained according to the corresponding relation between the voltage signal and the cloth thickness. The maximum value of the cloth thickness detection and the maximum value of the output voltage of the sensor can be set, and the corresponding relation between the cloth thickness and the voltage is obtained. Wherein, after installing cloth thickness sensor for the first time, need rectify the thickness value through operating panel, that is when not placing the cloth, set up the thickness value and be 0 mm.
For example, the maximum value of the output voltage of the sensor is 5V, the maximum value of the detected cloth thickness is 10mm, the detection accuracy is 0.1mm, an analog-to-digital converter is arranged in the sensor to sample the collected voltage signal, and if the output data of the analog-to-digital converter is 12-bit binary data, the value range of the voltage signal is 0 to 4095, so that the relationship between the cloth thickness and the voltage signal is T-K U, and K-1/409.5, wherein T represents the cloth thickness, and U represents the output voltage value of the sensor. Therefore, when the output voltage of the obtained cloth thickness sensor is 4095, the cloth thickness is 10 mm.
In addition, sewing patterns can be involved when the cloth is sewn, wherein the sewing patterns comprise a feeding needle distance and a middle presser foot amplitude, the feeding needle distance is the moving distance of the outer pressing frame, and the length of a needle sewing stitch formed on the cloth by the machine needle after one-time sewing can be represented. Different feeding needle pitches can be set when different needles are sewn aiming at one pattern. The width of the middle presser foot is the distance of the middle presser foot for executing the pressing or floating action, and different widths of the middle presser foot can be set in patterns according to different types of sewing cloth. For example, when sewing softer cloth, a larger width of the middle presser foot can be set, and when sewing harder cloth, a smaller width of the middle presser foot can be set, so that the cloth can be in a pressing state when sewing different cloth.
S202: determining a first angle range and a second angle range according to the cloth thickness value; the first angle range represents the angle range of the corresponding spindle motor when the feeding mechanism executes actions; the second angle range represents the angle range of the corresponding spindle motor when the middle presser foot performs the action.
After the cloth thickness value is determined, an angle range can be determined according to the cloth thickness, wherein the angle range comprises two angles, one angle range is corresponding to the feeding mechanism when the feeding mechanism executes action, and the other angle range is corresponding to the middle presser foot when the middle presser foot executes action. Because the timing of executing the action of the feeding mechanism and the middle presser foot is required to be the corresponding angle range of the machine needle on the cloth, the angle range of executing the action of the feeding mechanism or the middle presser foot can be changed after the thickness of the cloth is changed. For example, when the cloth becomes thick, the angle range in which the feeding mechanism or the middle presser foot performs the operation becomes small. The rotating speed of the spindle motor is influenced by the execution action of the feeding mechanism and the middle presser foot, so that the angle range corresponding to the feeding mechanism and the angle range corresponding to the middle presser foot under the current cloth thickness need to be determined.
S203: and determining the rotating speed of the spindle motor according to the first angle range, the second angle range, the feeding needle distance and the medium presser foot amplitude.
In this embodiment, after obtaining the first angle range, the second angle range, the feeding needle pitch, and the medium and medium presser foot amplitude, the rotation speed of the spindle motor can be determined. Specifically, the highest rotating speed of the feeding mechanism can be obtained according to the first angle range and the feeding needle pitch, the highest rotating speed of the middle presser foot can be obtained according to the second angle range and the amplitude of the middle presser foot, and then the rotating speed of the spindle motor can be determined based on the highest rotating speed of the feeding mechanism and the highest rotating speed of the middle presser foot.
S204: and controlling the spindle motor according to the rotating speed.
After the rotating speed is determined, the rotating speed can be sent to the spindle motor, so that the spindle motor rotates at the rotating speed, and the rotating speed of the spindle motor is suitable for the cloth thickness and the sewing pattern corresponding to the current machine needle.
By the method, the thickness of the cloth and the feeding needle distance in the pattern and the amplitude of the middle presser foot can be detected in real time when the cloth is sewn, the angle range of the feeding mechanism and the angle range of the middle presser foot can be determined according to the thickness of the cloth, the rotating speed of the spindle motor is further determined, the determined rotating speed is suitable for the thickness and the pattern of the current sewn cloth, the speed of the spindle motor can be automatically controlled, the determined rotating speed is accurate, the rotating speed does not need to be manually set, and the method has the advantage of being simple to operate. Furthermore, the feeding mechanism and the middle presser foot can be controlled, so that the execution time of the feeding mechanism and the middle presser foot is suitable for the current cloth thickness, the cloth is in a state suitable for sewing when the machine needle is used for sewing, and the stitch quality of sewing can be improved.
Fig. 3 is a flowchart of another sewing machine control method according to an embodiment of the present invention, which is based on the technical solutions provided by the foregoing embodiments and describes a sewing machine control process. As shown in fig. 3, after the sewing machine is started, the control flow of the sewing machine is as follows:
step S301: and acquiring the current cloth thickness value and pattern data.
The cloth thickness value can be determined according to a voltage signal output by the cloth thickness sensor, pattern data can be directly obtained from a pattern program to be sewn, and the pattern data comprises a feeding needle distance and a middle presser foot amplitude.
Step S302: determining control parameters according to the cloth thickness value and the pattern data; the control parameters comprise a rotating speed, a linear tension value, a starting angle and an ending angle of the pressing action of the middle presser foot, a starting angle and an ending angle of the feeding mechanism when the feeding mechanism executes the action, and a starting angle and an ending angle of the floating action of the middle presser foot.
After the cloth thickness and pattern data are obtained, control parameters can be obtained, and then all parts of the sewing machine are controlled according to the control parameters. When determining the control parameters according to the cloth thickness and the pattern data, a first angle range and a second angle range are determined according to the cloth thickness, and then the control parameters are determined based on the first angle range, the second angle range, the feeding needle pitch in the pattern data and the medium presser foot amplitude.
Optionally, before determining the first angle range and the second angle range according to the cloth thickness value, the method further includes: when the thickness of the cloth is changed, determining the thickness change value of the cloth; judging the relation between the cloth thickness variation value and a preset cloth thickness variation value; and when the cloth thickness variation value is larger than a preset cloth thickness variation value, determining the first angle range and the second angle range according to the cloth thickness value.
In the present embodiment, in order to avoid frequent switching of control commands for the respective parts of the sewing machine when a slight variation occurs in the cloth thickness, a cloth thickness variation value is set here. The obtained numerical value can be stored after the cloth thickness value is obtained every time, when the cloth thickness value is detected, the currently obtained cloth thickness value and the cloth thickness value stored last time can be compared to obtain a cloth thickness variation value, if the cloth thickness variation value is larger than or equal to a preset cloth thickness variation value, the cloth thickness can be considered to be changed, and at the moment, the first angle range and the second angle range can be determined according to the current cloth thickness value. Wherein, the preset cloth thickness variation value can be set according to the actual situation.
For example, if the preset cloth thickness variation value is 0.5mm, when the cloth thickness variation value is 0.3mm, it is determined that the cloth thickness has not been changed, and it is not necessary to re-determine the range of the first angle and the range of the second angle.
By the method, the problem that the speed of the main shaft is frequently modified due to the tiny thickness change of the cloth can be avoided, and the sewing machine is more flexibly controlled.
Optionally, determining the first angle range and the second angle range according to the cloth thickness value includes:
determining a cloth inlet angle and a cloth outlet angle corresponding to the cloth thickness value according to the cloth thickness value, the cloth inlet angle variation value and the cloth outlet angle variation value; the cloth feeding angle represents the angle of a corresponding spindle motor when a machine needle is inserted into cloth; the cloth discharging angle represents the angle of a corresponding spindle motor when the machine needle lifts cloth; and determining a first angle range and a second angle range according to the cloth feeding angle, the cloth discharging angle and the cloth feeding angle which starts in advance.
In this embodiment, before determining the first angle range or the second angle range, it is necessary to determine a cloth feeding angle and a cloth discharging angle under the current cloth thickness, where the angles both refer to an output angle value of the spindle motor, and specifically, the output angle value of the spindle motor may be obtained through an encoder connected to the spindle motor. The cloth feeding angle and the cloth discharging angle under the current cloth thickness are related to the initial cloth feeding angle, the initial cloth discharging angle, the cloth feeding angle change value and the cloth discharging angle change value, and the initial cloth feeding angle is the angle value when the cloth is not placed. For example, when the cloth is not placed, the cloth feeding angle is 110 degrees and the cloth discharging angle is 250 degrees, and when the thickness of the cloth changes by 1mm, the change value of the cloth feeding angle and the change value of the cloth discharging angle are 2 degrees, when the thickness of the cloth is 10mm, the cloth feeding angle is 110-2 × 10 to 90 degrees, and simultaneously the cloth discharging angle is 250+2 × 10 to 270 degrees. Therefore, the cloth feeding angle is equal to the difference value of the initial cloth feeding angle and the product of the cloth feeding angle change value and the cloth thickness; the cloth discharging angle is equal to the value obtained by summing the product of the initial cloth discharging angle, the cloth discharging angle change value and the cloth thickness.
After the cloth feeding angle and the cloth discharging angle are determined, a first angle range and a second angle range can be determined according to the cloth feeding angle, the cloth discharging angle and a cloth lower advance initial feeding angle, wherein the cloth lower advance initial feeding angle means that when a machine needle is under cloth, feeding action can be executed or presser foot floating action can be executed, at the moment, the needle is not broken, and the sewing speed can be increased through the advance cloth feeding. Therefore, the first angle range is from a first value to a second value, wherein the first value is equal to the difference between the cloth outlet angle and the cloth feeding angle at the beginning of the cloth feeding process, and the second value is the cloth inlet angle. When the cloth is advanced to start feeding by an angle of 40 degrees, the first angle range is 230 degrees to 90 degrees; the second angle range comprises the angle range of the pressing process of the middle presser foot and the angle range of the floating process of the middle presser foot. The pressing process of the middle presser foot is the process from the highest point of the middle presser foot to the cloth contact, therefore, the angle range of the pressing process is from a third value to a fourth value, wherein the third value is 0 degree, the fourth value is the cloth entering angle, and the angle range of the pressing process is from 0 degree to 90 degrees. The upward floating process of the middle presser foot is the process that the middle presser foot leaves the cloth to move to the highest point, therefore, the angle range of the upward floating process is the fifth numerical value to the sixth numerical value, wherein the fifth numerical value is the difference between the cloth outlet angle and the advanced initial feeding angle under the cloth, the sixth numerical value is 359 degrees, and the angle range of the upward floating process is 230 degrees to 359 degrees.
By the method, the first angle range corresponding to the feeding mechanism when the feeding mechanism executes the action and the second angle range corresponding to the middle presser foot when the middle presser foot executes the action can be determined according to the cloth thickness, and further the rotating speed of the spindle motor can be determined according to the two angle ranges.
Optionally, determining the rotation speed of the spindle motor according to the first angle range, the second angle range, the feeding needle pitch and the medium presser foot amplitude, includes: determining the action time of the middle presser foot according to the amplitude of the middle presser foot; determining the action time of the feeding mechanism according to the feeding needle pitch; determining a first rotating speed according to the action time of the feeding mechanism and the first angle range; determining a second rotating speed according to the action time of the middle presser foot and the second angle range; and determining the smaller value of the first rotating speed and the second rotating speed as the rotating speed of the spindle motor.
After the first angle range and the second angle range are determined, the rotating speed of the spindle motor can be determined by combining the feeding needle pitch and the medium and small presser foot amplitude. The speed of the feeding mechanism and the speed of the middle presser foot are fixed values, so that the action time of the feeding mechanism can be determined according to the feeding needle pitch, and the action time of the middle presser foot can be determined according to the amplitude of the middle presser foot. Determining the angle sum of the action of the feeding mechanism according to the first angle range, and dividing the obtained angle sum by the action time of the feeding mechanism to obtain a first rotating speed; correspondingly, the second rotating speed can be obtained according to a second angle range, wherein the second angle range is two angle ranges, and the angle range of the pressing process with the smaller angle range can be used.
Specifically, the highest speed of the feeding mechanism is determined according to the action time of the feeding mechanism and the first angle range, the highest speed of the middle presser foot is determined according to the action time of the middle presser foot and the second angle range, and then the rotating speed of the spindle motor is determined, wherein the rotating speed of the spindle motor is the smaller value of the highest rotating speed of the feeding mechanism and the highest rotating speed of the middle presser foot, because when the smaller value is taken, the angle range when the feeding mechanism executes the action can be ensured to be in the first angle range, and the angle range when the middle presser foot executes the action is in the second angle range.
For example, when the motion time of the feeding mechanism is 5ms and the first angle range is 230 degrees to 90 degrees, the sum of the angles of motion of the feeding mechanism is 220 degrees, and the first rotation speed can be determined according to 220 degrees and 5 ms. Similarly, when the action time of the middle presser foot is 3ms, the angle range of the pressing process in the second angle range is 0 degree to 90 degrees, and the total angle of the action when the middle presser foot is pressed down is 90 degrees, the second rotating speed can be determined according to 90 degrees and 3ms, and finally the smaller value of the first rotating speed and the second rotating speed is determined as the rotating speed of the spindle motor.
By the method, the rotating speed of the spindle motor can be determined in real time according to the thickness of the sewing cloth and the feeding needle distance and the medium presser foot amplitude in the sewing pattern, so that the determined rotating speed of the spindle motor is not only related to the thickness of the cloth, but also related to the feeding needle distance and the medium presser foot amplitude in the sewing pattern, the rotating speed of the spindle motor can be accurately determined, and the determined rotating speed is suitable for the current sewing working condition.
When the rotating speed of the spindle motor is determined, a first angle range corresponding to the feeding mechanism is determined, and the feeding motor can be controlled according to the first angle range. Wherein, the first value of the first angle range is the angle of the spindle motor corresponding to the difference between the cloth discharging angle and the cloth feeding angle in advance, namely the feeding starting angle; the second value of the first angle range is the angle of the spindle motor corresponding to the cloth feeding angle, namely the feeding ending angle.
When the rotating speed of the spindle motor is determined, a second angle range corresponding to the middle presser foot is determined, and the middle presser foot can be controlled according to the second angle range. The second angle range comprises an angle range of a pressing process and an angle range of a floating process, and a third numerical value in the angle range of the pressing process is the angle of the corresponding spindle motor when the needle is at the highest point before being inserted into the cloth, namely a pressing starting angle; the fourth value in the angle range of the pressing process is the cloth feeding angle, namely the pressing finishing angle; the fifth numerical value in the angle range in the floating process is the angle of the spindle motor corresponding to the difference between the cloth discharging angle and the cloth lower advanced initial feeding angle, namely the floating initial angle; the sixth numerical value in the angle range of the floating process is the angle of the corresponding spindle motor when the needle is at the highest point after being discharged, namely the floating finishing angle.
In addition, the parameter of the line tension can be set according to the thickness of the cloth. Optionally, the method further includes: presetting a reference line tension value and a reference cloth thickness value corresponding to the cloth type according to the cloth type; determining a linear tension value under the current cloth thickness according to the linear tension correction value, the reference line tension value and the reference cloth thickness value; and sending the determined line tension value to a line tension motor so that the line tension motor adjusts the wire clamping device.
In this embodiment, when the thickness of the cloth is changed, the linear tension value can be adjusted. Specifically, different reference line tension values can be set according to different cloth types, so that the obtained line tension value is more suitable for the current sewn cloth type. For example, when sewing soft cloth, the reference line tension value should be decreased properly, and when sewing hard cloth, the reference line tension value should be increased properly, so that the thread tension at the time of sewing more conforms to the type of cloth being sewn.
The line tension correction value refers to the change amount corresponding to the line tension value when the thickness of the cloth changes by unit amount. When the linear tension value under the current cloth thickness is determined according to the linear tension correction value, the reference line tension value and the reference cloth thickness value, the method can be as follows: and calculating the difference between the current cloth thickness value and the reference cloth thickness value, if the difference is a positive value, indicating that the current cloth thickness value is larger than the reference cloth thickness value, and if the difference is a negative value, indicating that the current cloth thickness value is smaller than the reference cloth thickness value. And multiplying the difference value by the line tension correction coefficient to obtain a multiplied result. The linear tension value under the current cloth thickness is the sum of the reference line tension value and the multiplication result. It should be noted that the multiplication result may be a negative value, which indicates that the linear tension value is smaller than the reference line tension value when the thickness of the fabric is smaller than the reference fabric thickness value. And then the linear tension motor can be controlled according to the obtained linear tension value.
In addition, after the linear tension value is determined, the obtained linear tension value needs to be compared with a preset minimum linear tension value and a preset maximum linear tension value, and if the obtained linear tension value is smaller than the preset minimum linear tension value, the preset minimum linear tension value is sent to the linear tension motor; if the obtained line tension value is greater than the preset maximum line tension value, the preset maximum line tension value is sent to the line tension motor, so that the numerical value sent to the line tension motor is between the preset minimum line tension value and the preset maximum line tension value, and the normal work of the line tension motor and the wire clamp can be ensured.
By the method, the corresponding thread tension value can be obtained according to different cloth types and thicknesses of the cloth, so that the determined thread tension value is more consistent with the current working condition when the cloth is sewn, and the problem of poor quality of sewing stitches can be further solved.
Step S303: and controlling the spindle motor according to the rotating speed.
After determining the rotational speed of the spindle motor, the rotational speed may be sent to the spindle motor so that the operating speed of the spindle motor is the rotational speed.
Step S304: and controlling the wire tension motor according to the wire tension value.
After the rotating speed of the spindle motor is adjusted, the line tension motor can be controlled according to the obtained line tension value, and the line tension motor can control the wire clamp, so that the output line tension can be adjusted by the wire clamp.
Step S305: and controlling the middle presser foot to execute the pressing action according to the starting angle and the ending angle of the pressing action of the middle presser foot.
When the presser foot carries out the action of pushing down in the control, specifically do:
acquiring a current angle value output by the spindle motor; if the current angle value is a third value, a pressing starting instruction is sent to a middle presser foot motor so that the middle presser foot starts to execute pressing action; and if the current angle value is a fourth numerical value, sending a pressing ending instruction to the middle presser foot motor so as to stop the middle presser foot from executing pressing action. The third value is the initial angle of the pressing action, and the fourth value is the ending angle of the pressing action.
The output end of the spindle motor is provided with an encoder, the encoder can obtain the current angle value output by the spindle motor, and when the spindle motor rotates to a preset angle, the encoder can send a corresponding instruction to the middle presser foot motor so as to enable the middle presser foot to execute a corresponding pressing action.
Step S306: and controlling the feeding mechanism to execute feeding action according to the starting angle and the ending angle of the feeding mechanism when executing the action.
When controlling the feeding motor, specifically: acquiring a current angle value output by the spindle motor; if the current angle value is a first numerical value, sending a work starting instruction to the feeding motor so as to enable the feeding mechanism to start to execute feeding action; and if the current angle value is a second numerical value, sending a work stopping instruction to the feeding motor so as to stop the feeding mechanism from executing feeding action. The first value is a starting angle when the feeding mechanism executes actions, and the second value is an ending angle when the feeding mechanism executes actions.
Specifically, the control process of the feeding motor is similar to that of the centering presser foot motor, and when the spindle motor rotates to a preset angle, a corresponding instruction can be sent to the feeding motor, so that the feeding mechanism executes feeding action.
Step S307: and controlling the middle presser foot to perform the floating action according to the starting angle and the finishing angle of the floating action of the middle presser foot.
When the presser foot carries out the action of pushing down in the control, specifically do: acquiring a current angle value output by the spindle motor; if the current angle value is a fifth numerical value, a floating starting instruction is sent to a middle presser foot motor so that the middle presser foot starts to perform floating action; and if the current angle value is a sixth numerical value, sending a floating finishing instruction to the middle presser foot motor so as to finish the floating action of the middle presser foot. Wherein the fifth numerical value is the initial angle of the floating motion, and the sixth numerical value is the end angle of the floating motion.
The process of the middle presser foot for executing the floating action is the same as the process of executing the pressing action, and the description is omitted here.
It should be noted that, the execution process of each component has an internal time sequence, after the feeding mechanism executes the feeding action, the middle presser foot presses the cloth, then the machine needle is controlled to execute one-time sewing, then the middle presser foot executes the floating action, and meanwhile, the feeding mechanism can execute the next cloth feeding operation.
By the method, when the thickness of the cloth is changed, the spindle motor can be controlled, the feeding motor, the middle presser foot motor and the thread tension motor can be controlled, so that the feeding mechanism can perform feeding action at a proper time, the middle presser foot can perform pressing or floating action at a proper time, and the thread clamp can enable the output thread tension to be a proper numerical value, so that the sewing stitch quality can be better.
Fig. 4 is a schematic structural diagram of a sewing machine control device according to an embodiment of the present invention, and as shown in fig. 4, the sewing machine control device 40 according to the embodiment may include:
the first determining module 401 is used for determining a cloth thickness value according to the acquired voltage signal and determining a feeding needle distance and a medium presser foot amplitude according to the acquired pattern data; the voltage signal is a signal which is output by the cloth thickness sensor and represents the cloth thickness.
A second determining module 402, configured to determine a first angle range and a second angle range according to the cloth thickness value; the first angle range represents the angle range of the corresponding spindle motor when the feeding mechanism executes actions; the second angle range represents the angle range of the corresponding spindle motor when the middle presser foot performs the action.
And a third determining module 403, configured to determine a rotation speed of the spindle motor according to the first angle range, the second angle range, the feeding needle pitch, and the medium presser foot amplitude.
And a control module 404, configured to control the spindle motor according to the rotation speed.
Optionally, the second determining module 402 is specifically configured to:
determining a cloth inlet angle and a cloth outlet angle corresponding to the cloth thickness value according to the cloth thickness value, the cloth inlet angle variation value and the cloth outlet angle variation value; the cloth feeding angle represents the angle of a corresponding spindle motor when a machine needle is inserted into cloth; the cloth discharging angle represents the angle of a corresponding spindle motor when the machine needle lifts cloth; and determining a first angle range and a second angle range according to the cloth feeding angle, the cloth discharging angle and the cloth feeding angle which starts in advance.
Optionally, the third determining module 403 is specifically configured to:
determining the action time of the middle presser foot according to the amplitude of the middle presser foot; determining the action time of the feeding mechanism according to the feeding needle pitch; determining a first rotating speed according to the action time of the feeding mechanism and the first angle range; determining a second rotating speed according to the action time of the middle presser foot and the second angle range; and determining the smaller value of the first rotating speed and the second rotating speed as the rotating speed of the spindle motor.
Optionally, the apparatus further includes a feeding mechanism control module, configured to obtain a current angle value output by the spindle motor; if the current angle value is a first numerical value, sending a work starting instruction to the feeding motor so as to enable the feeding mechanism to start to execute feeding action; if the current angle value is a second numerical value, a work stopping instruction is sent to the feeding motor, so that the feeding mechanism stops feeding; the first value of the first angle range is the angle of the spindle motor corresponding to the difference between the cloth discharging angle and the cloth feeding angle which is started in advance; and the second value of the first angle range is the angle of the spindle motor corresponding to the cloth feeding angle.
Optionally, the second angle range includes an angle range of a pressing process and an angle range of a floating process, and a third value in the angle range of the pressing process is an angle of the corresponding spindle motor when the needle is at the highest point before entering the cloth; a fourth numerical value in the angle range of the pressing process is the cloth feeding angle; the fifth numerical value in the angle range in the floating process is the angle of the spindle motor corresponding to the difference between the cloth discharging angle and the cloth feeding angle started in advance; the sixth numerical value in the angle range in the floating process is the angle of the corresponding spindle motor when the needle is at the highest point after being discharged; the device also comprises a medium voltage foot control module which is used for obtaining the current angle value output by the spindle motor; if the current angle value is a third value, a pressing starting instruction is sent to the middle presser foot motor so that the middle presser foot starts to execute pressing; if the current angle value is a fourth numerical value, sending a pressing ending instruction to a middle presser foot motor so as to stop the middle presser foot from executing pressing action; if the current angle value is a fifth numerical value, a floating starting instruction is sent to a middle presser foot motor so that the middle presser foot starts to perform floating action; and if the current angle value is a sixth numerical value, sending a floating finishing instruction to the middle presser foot motor so as to finish the floating action of the middle presser foot.
Optionally, the apparatus further includes a linear tension control module, configured to preset a reference line tension value and a reference fabric thickness value corresponding to the fabric type according to the fabric type; determining a linear tension value under the current cloth thickness according to the linear tension correction value, the reference line tension value and the reference cloth thickness value; and sending the determined line tension value to a line tension motor so that the line tension motor adjusts the wire clamping device.
Optionally, the second determining module 402 is further configured to:
when the thickness of the cloth is changed, determining the thickness change value of the cloth; judging the relation between the cloth thickness variation value and a preset cloth thickness variation value; and when the cloth thickness variation value is larger than a preset cloth thickness variation value, determining the first angle range and the second angle range according to the cloth thickness value.
The sewing machine control device provided by the embodiment of the invention can realize the sewing machine control method of the embodiment shown in fig. 2 and 3, the realization principle and the technical effect are similar, and the details are not repeated.
Fig. 5 is a schematic diagram of a hardware structure of the sewing machine control device according to the embodiment of the present invention. As shown in fig. 5, the present embodiment provides a sewing machine control apparatus 50 including: at least one processor 501 and memory 502. The processor 501 and the memory 502 are connected by a bus 503.
In a specific implementation, the at least one processor 501 executes the computer-executable instructions stored in the memory 502, so that the at least one processor 501 executes the sewing machine control method in the above-described method embodiment.
For a specific implementation process of the processor 501, reference may be made to the above method embodiments, which implement the similar principle and technical effect, and this embodiment is not described herein again.
In the embodiment shown in fig. 5, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise high speed RAM memory and may also include non-volatile storage NVM, such as at least one disk memory.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The embodiment of the invention also provides a computer-readable storage medium, wherein a computer executing instruction is stored in the computer-readable storage medium, and when a processor executes the computer executing instruction, the sewing machine control method of the embodiment of the method is realized.
The computer-readable storage medium may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. Readable storage media can be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium may also reside as discrete components in the apparatus.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A sewing machine control method is characterized by comprising the following steps:
determining a cloth thickness value according to the acquired voltage signal, and determining a feeding needle distance and a medium presser foot amplitude according to the acquired pattern data; the voltage signal is a signal which is output by the cloth thickness sensor and represents the cloth thickness;
determining a first angle range and a second angle range according to the cloth thickness value; the first angle range represents the angle range of the corresponding spindle motor when the feeding mechanism executes actions; the second angle range represents the angle range of the corresponding spindle motor when the middle presser foot performs action;
determining the action time of the middle presser foot according to the amplitude of the middle presser foot; determining the action time of the feeding mechanism according to the feeding needle pitch;
determining a first rotating speed according to the action time and the first angle range of the feeding mechanism; determining a second rotating speed according to the action time of the middle presser foot and a second angle range;
determining the smaller value of the first rotating speed and the second rotating speed as the rotating speed of the spindle motor;
and controlling the spindle motor according to the rotating speed.
2. The method of claim 1, wherein determining a first angular range and a second angular range from the cloth thickness value comprises:
determining a cloth inlet angle and a cloth outlet angle corresponding to the cloth thickness value according to the cloth thickness value, the cloth inlet angle variation value and the cloth outlet angle variation value; the cloth feeding angle represents the angle of a corresponding spindle motor when a machine needle is inserted into cloth; the cloth discharging angle represents the angle of a corresponding spindle motor when the machine needle lifts cloth;
and determining a first angle range and a second angle range according to the cloth feeding angle, the cloth discharging angle and a cloth lower advanced initial feeding angle, wherein the cloth lower advanced initial feeding angle is an angle for starting to execute a feeding action or an angle for starting to execute a floating action of the middle presser foot.
3. The method of claim 2, further comprising:
acquiring a current angle value output by the spindle motor;
if the current angle value is a first numerical value, sending a work starting instruction to a feeding motor so as to enable the feeding mechanism to start to execute feeding action; if the current angle value is a second numerical value, a work stopping instruction is sent to the feeding motor, so that the feeding mechanism stops feeding;
the first numerical value is the angle of the spindle motor corresponding to the difference between the cloth discharging angle and the cloth feeding angle which is started in advance; the second value is the angle of the spindle motor corresponding to the cloth feeding angle.
4. The method according to claim 2, wherein the second angle range comprises an angle range of a pressing process and an angle range of a floating process, and a third value in the angle range of the pressing process is an angle of a spindle motor corresponding to the highest point before the machine needle is inserted into the cloth; a fourth numerical value in the angle range of the pressing process is the cloth feeding angle; the fifth numerical value in the angle range in the floating process is the angle of the spindle motor corresponding to the difference between the cloth discharging angle and the cloth feeding angle started in advance; the sixth numerical value in the angle range in the floating process is the angle of the corresponding spindle motor when the needle is at the highest point after being discharged; the method further comprises the following steps:
acquiring a current angle value output by the spindle motor; if the current angle value is a third value, a pressing starting instruction is sent to a middle presser foot motor so that the middle presser foot starts to execute pressing action; if the current angle value is a fourth numerical value, sending a pressing ending instruction to a middle presser foot motor so as to stop the middle presser foot from executing pressing action;
if the current angle value is a fifth numerical value, a floating starting instruction is sent to a middle presser foot motor so that the middle presser foot starts to perform floating action; and if the current angle value is a sixth numerical value, sending a floating finishing instruction to the middle presser foot motor so as to finish the floating action of the middle presser foot.
5. The method of claim 1, further comprising:
presetting a reference line tension value and a reference cloth thickness value corresponding to the cloth type according to the cloth type;
determining a linear tension value under the current cloth thickness according to the linear tension correction value, the reference line tension value and the reference cloth thickness value;
and sending the determined line tension value to a line tension motor so that the line tension motor adjusts the wire clamping device.
6. The method according to claim 1, further comprising, before determining the first and second angular ranges from the cloth thickness value:
when the thickness of the cloth is changed, determining the thickness change value of the cloth;
judging the relation between the cloth thickness variation value and a preset cloth thickness variation value;
correspondingly, determining a first angle range and a second angle range according to the cloth thickness value comprises the following steps:
and when the cloth thickness variation value is larger than a preset cloth thickness variation value, determining the first angle range and the second angle range according to the cloth thickness value.
7. A sewing machine control device, characterized by comprising:
the first determining module is used for determining a cloth thickness value according to the acquired voltage signal and determining a feeding needle distance and a medium presser foot amplitude according to the acquired pattern data; the voltage signal is a signal which is output by the cloth thickness sensor and represents the cloth thickness;
the second determining module is used for determining a first angle range and a second angle range according to the cloth thickness value; the first angle range represents the angle range of the corresponding spindle motor when the feeding mechanism executes actions; the second angle range represents the angle range of the corresponding spindle motor when the middle presser foot performs action;
the third determining module is used for determining the rotating speed of the spindle motor according to the first angle range, the second angle range, the feeding needle distance and the medium presser foot amplitude;
the control module is used for controlling the spindle motor according to the rotating speed;
the third determining module is specifically configured to: determining the action time of the middle presser foot according to the amplitude of the middle presser foot; determining the action time of the feeding mechanism according to the feeding needle pitch; determining a first rotating speed according to the action time of the feeding mechanism and the first angle range; determining a second rotating speed according to the action time of the middle presser foot and the second angle range; and determining the smaller value of the first rotating speed and the second rotating speed as the rotating speed of the spindle motor.
8. A sewing machine control apparatus, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of controlling a sewing machine of any of claims 1-6.
9. A computer-readable storage medium having computer-executable instructions stored therein, which when executed by a processor, implement the sewing machine control method according to any one of claims 1 to 6.
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