CN112921525B - Sewing machine control system and sewing machine control method - Google Patents

Sewing machine control system and sewing machine control method Download PDF

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CN112921525B
CN112921525B CN201911231172.9A CN201911231172A CN112921525B CN 112921525 B CN112921525 B CN 112921525B CN 201911231172 A CN201911231172 A CN 201911231172A CN 112921525 B CN112921525 B CN 112921525B
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inductor
sewing machine
sensor
trimming
cloth
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CN112921525A (en
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金琳
徐永明
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Jack Technology Co Ltd
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/02—Devices for severing the needle or lower thread controlled by the sewing mechanisms

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Abstract

The invention provides a sewing machine control system and a sewing machine control method. Wherein, this sewing machine control system includes: a first inductor 3, a second inductor 4 and a controller; the first inductor 3 and the second inductor 4 are respectively coupled with the controller, wherein the first inductor 3 and the second inductor 4 are arranged on a sewing table 1 of the sewing machine, and a preset included angle is formed between a straight line where the first inductor 3 and the second inductor 4 are located and a feeding direction of the sewing machine; and the controller is used for performing front trimming control according to the first detection results of the first sensor 3 and the second sensor 4. According to the invention, the problem that the sewing machine in the related art cannot perform normal sewing and trimming on the triangular fabric is solved, and cloth cutting during sewing of the triangular fabric is avoided.

Description

Sewing machine control system and sewing machine control method
Technical Field
The invention relates to the technical field of sewing machines, in particular to a sewing machine control system and a sewing machine control method.
Background
The existing automatic thread trimming sewing machine generally adopts a photoelectric correlation sensor to sense, after a fabric passes through the sensor, the fabric is judged and controlled by electric control, and after a plurality of needle numbers are delayed through the sensor, a thread trimming cutter realizes the thread trimming function. The existing overedger generally adopts a thread cutting mode of a chopper or a side suction knife, and fabric with a normal front end flush can be normally sewn and cut, but because the position distribution of the sensors is generally in a linear distribution, when the fabric is triangular, the front end head part of the triangular fabric with the triangular front end is easily cut by mistake during front thread cutting, and the rear end tail part of the triangular fabric with the triangular rear end is easily cut during rear thread cutting. This problem can lead to the user's surface fabric to scrap, causes the loss, and can't carry out the normal sewing trimming of triangle surface fabric.
Aiming at the problem that a sewing machine in the related art cannot carry out normal sewing and thread cutting of triangular fabrics, an effective solution is not provided at present.
Disclosure of Invention
In view of the above, it is necessary to provide a sewing machine control system and a sewing machine control method for solving the problem that the sewing machine in the related art cannot perform normal sewing and trimming of the triangular fabric.
In a first aspect, the present embodiment provides a sewing machine control system, including: a first inductor 3, a second inductor 4 and a controller; the first inductor 3 and the second inductor 4 are respectively coupled with the controller, wherein the first inductor 3 and the second inductor 4 are arranged on a sewing table 1 of a sewing machine, and a preset included angle is formed between a straight line where the first inductor 3 and the second inductor 4 are located and a feeding direction of the sewing machine; the controller is configured to perform front trimming control according to first detection results of the first sensor 3 and the second sensor 4.
In one embodiment, the sewing machine control system further comprises: a third inductor 5 and a fourth inductor 7, the third inductor 5 and the fourth inductor 7 being coupled to the controller, respectively; the third inductor 5 is arranged at the tail end of the needle plate 8 and is positioned on one side of a thread cutting cutter meshing surface 6 of the sewing machine; the fourth inductor 7 is arranged on the sewing table 1 and is positioned on an extension line of the meshing surface 6 of the thread cutting knife; the controller is further configured to perform post trimming control according to second detection results of the third sensor 5 and the fourth sensor 7.
In one embodiment, the sewing machine control system further comprises: a fifth inductor 2, the fifth inductor 2 being coupled with the controller; wherein the fifth inductor 2 is arranged on the sewing table 1.
In one embodiment, the predetermined included angle is 90 °.
In a second aspect, the present embodiment further provides a sewing machine control method of a sewing machine control system, the sewing machine control system including: a first inductor 3, a second inductor 4 and a controller; the first inductor 3 and the second inductor 4 are respectively coupled with the controller, wherein the first inductor 3 and the second inductor 4 are arranged on a sewing table 1 of a sewing machine, a preset included angle is formed between a straight line where the first inductor 3 and the second inductor 4 are located and a feeding direction of the sewing machine, and the control method of the sewing machine comprises the following steps: detecting the cloth through the first inductor 3 and the second inductor 4 to obtain a first detection result; and performing front trimming control according to the first detection result.
In one embodiment, when the predetermined included angle is 90 °, performing front trimming control according to the first detection result includes: judging whether the front end of the cloth exceeds the meshing surface 6 of the trimming cutter when the second sensor 4 detects the cloth according to the first detection result; when the fact that the front end of the cloth exceeds the meshing surface 6 of the trimming cutter when the second sensor 4 detects the cloth is judged, front trimming is not executed; otherwise, determining a second trimming delay stitch number according to the first detection result, and executing front trimming after sewing the second trimming delay stitch number after the first sensor 3 detects the cloth.
In one embodiment, the determining the second number of the trimming delay pins according to the first detection result comprises: determining the second trimming delay pin number N according to the following formulaFront part：
Figure BDA0002303585210000031
Wherein the content of the first and second substances,
Figure BDA0002303585210000032
l' represents the distance from the second inductor 4 to the meshing surface 6 of the shearing cutter; d represents the current needle pitch value of the sewing machine; y is1Represents the distance from the first inductor 3 to the second inductor 4; y is2Indicating the distance from the first inductor 3 to the edge of the needle plate 8 on the side of the notch of the cutting knife of the needle plate 8; v represents the rotation speed of the sewing machine when the second sensor 4 detects the cloth; a represents an acceleration of the sewing machine; Δ t represents a time difference from when the second sensor 4 detects the cloth to when the first sensor 3 detects the cloth;
Figure BDA0002303585210000033
indicating a rounding down.
In one embodiment, the sewing machine control system further comprises: a third inductor 5 and a fourth inductor 7, the third inductor 5 and the fourth inductor 7 being coupled to the controller, respectively; the third inductor 5 is arranged at the tail end of the needle plate 8 and is positioned on one side of a meshing surface 6 of a thread cutting cutter of the sewing machine; the fourth inductor 7 is arranged on the sewing table 1 and is positioned on an extension line of the meshing surface 6 of the thread cutting knife; after performing the front cut control according to the first detection result, the sewing machine control method further includes: detecting the cloth through the third inductor 5 and the fourth inductor 7 to obtain a second detection result; and performing post trimming control according to the second detection result.
In one embodiment, the performing post-trimming control according to the second detection result includes: according to the second detection result, judging whether the fourth sensor 7 detects that the cloth leaves before the third sensor 5; when the fourth sensor 7 detects that the cloth leaves before the third sensor 5, determining a third trimming delay stitch number according to the first detection result, and performing post trimming after the third trimming delay stitch number is sewn after the third sensor 5 detects that the cloth leaves; otherwise, determining a fourth trimming delay stitch number according to the first detection result, and executing the post trimming after sewing the fourth trimming delay stitch number after the fourth sensor 7 detects that the cloth leaves.
In one embodiment, the determining the third number of the trimming delay pins according to the first detection result comprises: determining the third trimming delay stitch number N according to the following formulaRear end：
Figure BDA0002303585210000041
Wherein the content of the first and second substances,
Figure BDA0002303585210000042
L4the distance from the third inductor 5 to the meshing surface 6 of the thread cutting cutter is shown; d represents the current stitch length value of the sewing machine; y is3Represents the distance of the fourth inductor 7 to the third inductor 5 in the feeding direction; y is4Indicating the third inductor5 to the edge of the needle plate 8 positioned on one side of the notch of the cutter of the needle plate 8; v represents the rotation speed of the sewing machine when the fourth sensor 7 detects that the cloth is off; a represents an acceleration of the sewing machine; Δ t represents a time difference from when the fourth sensor 7 detects the departure of the cloth to when the third sensor 5 detects the departure of the cloth;
Figure BDA0002303585210000046
indicating rounding up.
In one embodiment, the determining the fourth trimming delay pin number according to the first detection result includes: determining the fourth trimming delay stitch number N according to the following formulaRear end：
Figure BDA0002303585210000045
Wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002303585210000044
L4the distance from the third inductor 5 to the meshing surface 6 of the trimming cutter is shown; d represents the current stitch length value of the sewing machine; y is3Represents the distance of the fourth inductor 7 to the third inductor 5 in the feeding direction; y is4The distance from the third inductor 5 to the edge of the needle plate 8 positioned on one side of the notch of the cutter of the needle plate 8 is shown; v represents the rotation speed of the sewing machine when the fourth sensor 7 detects that the cloth is off; a represents an acceleration of the sewing machine; Δ t represents a time difference from when the third sensor 5 detects the departure of the cloth to when the fourth sensor 7 detects the departure of the cloth;
Figure BDA0002303585210000043
indicating rounding up.
In one embodiment, in the case where the predetermined included angle is 90 °, after performing the front trimming control according to the first detection result, the sewing machine control method further includes: detecting the cloth through the first inductor 3 and the second inductor 4 to obtain a third detection result; and performing rear trimming control according to the third detection result.
In one embodiment, the performing post trimming control according to the third detection result includes: and determining a fifth trimming delay stitch number according to the third detection result, and performing post trimming after sewing the fifth trimming delay stitch number after the first sensor 3 detects that the cloth leaves.
In one embodiment, the determining the fifth trimming delay pin number according to the third detection result includes: determining the number N of the fifth trimming delay pins according to the following formulaRear end：
Figure BDA0002303585210000051
Wherein the content of the first and second substances,
Figure BDA0002303585210000052
l' represents the distance from the second inductor 4 to the thread cutting knife engagement surface 6; d represents the current needle pitch value of the sewing machine; y is1Represents the distance from the first inductor 3 to the second inductor 4; y is2Indicating the distance from the first inductor 3 to the edge of the needle board 8 at one side of the cutting notch of the needle board 8; v represents the rotation speed of the sewing machine when the second sensor 4 detects the cloth; a represents an acceleration of the sewing machine; Δ t represents a time difference between when the first sensor 3 detects the departure of the cloth and when the second sensor 4 detects the departure of the cloth;
Figure BDA0002303585210000053
indicating rounding up.
According to the sewing machine control system and the sewing machine control method provided by the embodiment of the invention, the adopted sewing machine control system comprises: a first inductor 3, a second inductor 4 and a controller; the first inductor 3 and the second inductor 4 are respectively coupled with the controller, wherein the first inductor 3 and the second inductor 4 are arranged on the sewing table 1 of the sewing machine, a preset included angle is formed between the straight line where the first inductor 3 and the second inductor 4 are located and the feeding direction of the sewing machine, the controller performs front trimming control according to the first detection result of the first inductor 3 and the first detection result of the second inductor 4, the problem that the sewing machine in the related art cannot perform normal sewing trimming of the triangular fabric is solved, and cloth cutting during sewing of the triangular fabric is avoided.
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FIG. 1 is a schematic view of a sewing table 1 of a sewing machine control system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a sewing machine control method according to an embodiment of the present invention;
FIG. 3 is a preferred flow chart of a sewing machine control method according to an embodiment of the present invention;
FIG. 4 is a schematic view of a sewing table 1 of a sewing machine of another sewing machine control system according to an embodiment of the present invention;
FIG. 5 is a schematic view showing a positional relationship between a sewing table 1 and a fabric A and a fabric B of a sewing machine control system according to an embodiment of the present invention;
FIG. 6 is a schematic view showing a positional relationship between a sewing table 1 and a fabric A of a sewing machine control system according to an embodiment of the present invention;
FIG. 7 is a schematic view showing a positional relationship between a sewing table 1 and a fabric B of a sewing machine control system according to an embodiment of the present invention;
FIG. 8 is a schematic diagram showing the positional relationship of the sensors 3, 4 and 5 of the sewing machine control system according to the embodiment of the present invention;
FIG. 9 is a schematic diagram showing the positional relationship between the sensors 3 and 4 of the sewing machine control system according to the embodiment of the present invention;
FIG. 10 is a schematic view showing a positional relationship between a sewing table 1 and a fabric C of a sewing machine control system according to an embodiment of the present invention;
FIG. 11 is a schematic view showing a positional relationship between a sewing table 1 and a fabric D of a sewing machine control system according to an embodiment of the present invention;
FIG. 12 is a schematic view showing a positional relationship between a sewing table 1 and a fabric A and a fabric B of a sewing machine of another sewing machine control system according to the embodiment of the present invention;
FIG. 13 is a schematic view showing a positional relationship between a sewing table 1 and a fabric A of a sewing machine of another sewing machine control system according to the embodiment of the present invention;
FIG. 14 is a schematic view showing a positional relationship between a sewing table 1 and a fabric B of a sewing machine of another sewing machine control system according to the embodiment of the present invention;
FIG. 15 is a schematic view showing a positional relationship between sensors 4 and 5 of another sewing machine control system according to the embodiment of the present invention;
FIG. 16 is a schematic diagram showing the positional relationship between sensors 3 and 4 of another sewing machine control system according to the embodiment of the present invention;
FIG. 17 is a schematic view showing a positional relationship between a sewing table 1 and a fabric C of a sewing machine of another sewing machine control system according to the embodiment of the present invention;
FIG. 18 is a schematic view showing a positional relationship between a sewing table 1 and a fabric D of a sewing machine of another sewing machine control system according to the embodiment of the present invention;
FIG. 19 is a schematic view showing a positional relationship between a sewing table 1 and a fabric C of a sewing machine of another sewing machine control system according to the embodiment of the present invention;
fig. 20 is a flowchart of a front trimming control method according to a preferred embodiment of the present invention;
fig. 21 is a flowchart of a rear trimming control method according to a preferred embodiment of the present invention.
Detailed Description
In the present embodiment, there is provided a sewing machine control system, fig. 1 is a schematic view of a sewing table 1 of a sewing machine of the sewing machine control system according to the embodiment of the present invention, as shown in fig. 1, the sewing machine control system including: a first inductor 3, a second inductor 4, and a controller (not shown in fig. 1); the first inductor 3 and the second inductor 4 are respectively coupled with the controller, wherein the first inductor 3 and the second inductor 4 are arranged on a sewing table 1 of the sewing machine, and a straight line where the first inductor 3 and the second inductor 4 are located and a feeding direction of the sewing machine form a preset included angle; and the controller is used for carrying out front trimming control according to the first detection results of the first inductor 3 and the second inductor 4.
Wherein the first inductor 3 and the second inductor 4 are preferably arranged on the same side of the needle board (8). The first sensor 3 and the second sensor 4 are used for detecting the arrival or departure time of the cloth, and the controller estimates the shape of the irregular cloth by using the detection results detected by the first sensor 3 and the second sensor 4 and combining the known sewing speed and the position relation set by the sensors.
In one embodiment, the sewing machine control system further comprises: a third inductor 5 and a fourth inductor 7, wherein the third inductor 5 and the fourth inductor 7 are respectively coupled with the controller; the third inductor 5 is arranged at the tail end of the needle plate 8 and is positioned on one side of a meshing surface 6 of a thread cutting cutter of the sewing machine; the fourth inductor 7 is arranged on the sewing table 1 and is positioned on the extension line of the meshing surface 6 of the thread cutting cutter; and the controller is also used for carrying out post trimming control according to second detection results of the third sensor 5 and the fourth sensor 7.
The third sensor 5 and the fourth sensor 7 are used for detecting the arrival or departure time of the cloth, and the controller estimates the shape of the irregular cloth by using the detection results detected by the third sensor 5 and the fourth sensor 7 and combining the known sewing speed and the position relation of the sensor arrangement.
In one embodiment, the sewing machine control system further comprises: a fifth inductor 2, the fifth inductor 2 being coupled to the controller; wherein, the fifth inductor 2 is arranged on the sewing table 1. The fifth sensor 2 is used for detecting the feeding direction of the cloth and judging whether the current control of the thread to be cut is the front thread cutting control. For example, in the case where the fifth sensor 2 detects the cloth before the first sensor 3, it may be determined that the current thread to be cut is the front cut control.
The fifth inductor 2 is disposed at the left or right side of the first inductor 3. In one embodiment, the fifth inductor 2 and the second inductor 4 are disposed on a first straight line parallel to the feeding direction, and the first inductor 3 is disposed on the side opposite to the needle plate 8 among both sides of the first straight line.
In one embodiment, a first projection point of the first sensor 3 on the first straight line is positioned between a second projection point and the second sensor 4, wherein the second projection point refers to a projection point of the front end of a cutting notch of a needle plate 8 of the sewing machine on the first straight line.
In one embodiment, the first inductor 3, the second inductor 4 and the third inductor 5 are arranged collinearly.
The sewing machine control method of the present embodiment will be described and explained with reference to the sewing machine control system shown in fig. 1.
Fig. 2 is a flowchart of a sewing machine control method according to an embodiment of the present invention, as shown in fig. 2, the flowchart including the steps of:
step S201, detecting cloth through a first inductor 3 and a second inductor 4 to obtain a first detection result;
and step S202, performing front trimming control according to the first detection result.
In one embodiment, in the case that a first projection point of the first sensor 3 on a first straight line is located between a second projection point and the second sensor 4, wherein the second projection point refers to a projection point of the front end of a cutting notch of a needle plate 8 of the sewing machine on the first straight line, performing front trimming control according to a first detection result comprises: according to the first detection result, whether the second sensor 4 detects the cloth before the first sensor 3 is judged; when the second sensor 4 detects cloth before the first sensor 3, front trimming is not executed; otherwise, the first trimming delay stitch number is determined according to the first detection result, and the front trimming is executed after the second sensor 4 detects the cloth and sews the first trimming delay stitch number.
In one embodiment, determining the first number of trimming delay pins according to the first detection result includes: determining the first number of trimming delay pins N according to the following formulaFront side：
Figure BDA0002303585210000091
Wherein the content of the first and second substances,
Figure BDA0002303585210000092
l' represents the distance from the second inductor 4 to the meshing surface 6 of the trimming cutter; d represents the current stitch length value of the sewing machine; l is0Represents the distance from the first projection point to the second sensor 4; y is1Represents the distance from the first sensor 3 to the first projection point; y is2Indicating the distance from the first inductor 3 to the edge of the needle board 8 on one side of the notch of the cutter of the needle board 8; v represents the rotational speed of the sewing machine when the first sensor 3 detects the cloth; a represents the acceleration of the sewing machine; Δ t represents a time difference from when the first sensor 3 detects the cloth to when the second sensor 4 detects the cloth;
Figure BDA0002303585210000093
indicating a rounding down.
Fig. 3 is a preferred flowchart of a sewing machine control method according to an embodiment of the present invention, as shown in fig. 3, the flowchart including the steps of:
step S301, detecting the cloth through the first inductor 3 and the second inductor 4 to obtain a first detection result.
And step S302, performing front trimming control according to the first detection result.
And step S303, detecting the cloth through the third inductor 5 and the fourth inductor 7 to obtain a second detection result.
And step S304, performing post trimming control according to the second detection result.
In one embodiment, the performing post trimming control according to the second detection result includes: according to the second detection result, whether the fourth sensor 7 detects that the cloth leaves before the third sensor 5 is judged; when the fourth sensor 7 detects that the cloth leaves before the third sensor 5, determining the number of third trimming delay stitches according to the first detection result, and sewing the third trimming delay stitches after the third sensor 5 detects that the cloth leaves; otherwise, determining a fourth trimming delay stitch number according to the first detection result, and executing the post trimming after sewing the fourth trimming delay stitch number after the fourth sensor 7 detects that the cloth leaves.
In one of themIn an embodiment, the determining the third trimming delay pin number according to the first detection result includes: determining the third trimming delay pin number N according to the following formulaRear end：
Figure BDA0002303585210000101
Wherein the content of the first and second substances,
Figure BDA0002303585210000102
L4the distance from the third inductor 5 to the meshing surface 6 of the thread cutting cutter is shown; d represents the current needle pitch value of the sewing machine; y is3Represents the distance from the fourth inductor 7 to the third inductor 5 in the feeding direction; y is4Showing the distance from the third inductor 5 to the edge of the needle plate 8 on one side of the notch of the cutter of the needle plate 8; v represents the rotating speed of the sewing machine when the fourth sensor 7 detects that the cloth leaves; a represents the acceleration of the sewing machine; Δ t represents a time difference from when the fourth sensor 7 detects the departure of the cloth to when the third sensor 5 detects the departure of the cloth;
Figure BDA0002303585210000103
indicating rounding up.
In one embodiment, the determining the fourth trimming delay pin number according to the first detection result includes: determining the fourth trimming delay pin number N according to the following formulaRear end：
Figure BDA0002303585210000111
Wherein the content of the first and second substances,
Figure BDA0002303585210000112
L4the distance from the third inductor 5 to the meshing surface 6 of the thread cutting cutter is shown; d represents the current stitch length value of the sewing machine; y is3Represents the distance from the fourth inductor 7 to the third inductor 5 in the feeding direction; y is4Showing the distance from the third inductor 5 to the edge of the needle plate 8 on one side of the notch of the cutter of the needle plate 8; v indicates that the fourth sensor 7 detectsThe rotational speed of the sewing machine when the cloth leaves; a represents the acceleration of the sewing machine; Δ t represents a time difference from when the third sensor 5 detects the departure of the cloth to when the fourth sensor 7 detects the departure of the cloth;
Figure BDA0002303585210000113
indicating rounding up.
In the present embodiment, there is also provided a sewing machine control system, and fig. 4 is a schematic view of a sewing table 1 of a sewing machine of the sewing machine control system according to the embodiment of the present invention, and as shown in fig. 4, the sewing machine control system is structurally different from the sewing machine control system shown in fig. 1 mainly in that a line in which a first inductor 3 and a second inductor 4 are located has a predetermined angle of 90 ° with a feeding direction of the sewing machine.
The sewing machine control method of the present embodiment will be described and explained with reference to the sewing machine control system shown in fig. 4.
The flow of the sewing machine control method of the sewing machine control system shown in fig. 4 is substantially the same as the flow of the sewing machine control method shown in fig. 2, except that performing the front trimming control based on the first detection result in step S202 includes: judging whether the front end of the cloth exceeds the meshing surface 6 of the trimming cutter when the second sensor 4 detects the cloth according to the first detection result; when the condition that the front end of the cloth exceeds the meshing surface 6 of the trimming cutter when the second sensor 4 detects the cloth is judged, front trimming is not executed; otherwise, the second trimming delay needle number is determined according to the first detection result, and the front trimming is executed after the first sensor 3 detects the cloth and the second trimming delay needle number is sewn.
In one embodiment, the determining the second number of the trimming delay pins according to the first detection result comprises: determining a second number of trimming delay pins N according to the following formulaFront part：
Figure BDA0002303585210000121
Wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002303585210000122
l' represents the distance from the second inductor 4 to the meshing surface 6 of the trimming cutter; d represents the current stitch length value of the sewing machine; y is1Represents the distance from the first inductor 3 to the second inductor 4; y is2Indicating the distance from the first inductor 3 to the edge of the needle board 8 on one side of the notch of the cutter of the needle board 8; v represents the rotational speed of the sewing machine when the second sensor 4 detects the cloth; a represents the acceleration of the sewing machine; Δ t represents a time difference from when the second sensor 4 detects the cloth to when the first sensor 3 detects the cloth;
Figure BDA0002303585210000123
meaning rounding down.
The method of controlling the back cut line of the sewing machine control system shown in fig. 4 may be the same as the method of controlling the back cut line of the sewing machine control system shown in fig. 1.
In one embodiment, after the front trimming control is performed based on the first detection result, the sewing machine control method further includes: detecting the cloth through a third inductor 5 and a fourth inductor 7 to obtain a second detection result; and performing post trimming control according to the second detection result.
In one embodiment, the performing post-trimming control according to the second detection result includes: according to the second detection result, whether the fourth sensor 7 detects that the cloth leaves before the third sensor 5 is judged; when the fourth sensor 7 detects that the cloth leaves before the third sensor 5, determining the number of third trimming delay stitches according to the first detection result, and sewing the third trimming delay stitches after the third sensor 5 detects that the cloth leaves; otherwise, determining a fourth trimming delay stitch number according to the first detection result, and executing the post trimming after sewing the fourth trimming delay stitch number after the fourth sensor 7 detects that the cloth leaves.
In one embodiment, the determining the third number of trimming delay pins according to the first detection result includes: determining the third number of trimming delay pins N according to the following formulaRear end：
Figure BDA0002303585210000124
Wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002303585210000125
L4the distance from the third inductor 5 to the meshing surface 6 of the trimming cutter is shown; d represents the current needle pitch value of the sewing machine; y is3Represents the distance from the fourth inductor 7 to the third inductor 5 in the feeding direction; y is4Showing the distance from the third inductor 5 to the edge of the needle plate 8 on one side of the notch of the cutter of the needle plate 8; v represents the rotating speed of the sewing machine when the fourth sensor 7 detects that the cloth leaves; a represents the acceleration of the sewing machine; Δ t represents a time difference from when the fourth sensor 7 detects the departure of the cloth to when the third sensor 5 detects the departure of the cloth;
Figure BDA0002303585210000135
indicating rounding up.
In one embodiment, the determining the fourth trimming delay pin number according to the first detection result includes: determining the fourth trimming delay stitch number N according to the following formulaRear end：
Figure BDA0002303585210000131
Wherein the content of the first and second substances,
Figure BDA0002303585210000132
L4the distance from the third inductor 5 to the meshing surface 6 of the thread cutting cutter is shown; d represents the current stitch length value of the sewing machine; y is3Represents the distance from the fourth inductor 7 to the third inductor 5 in the feeding direction; y is4Showing the distance from the third inductor 5 to the edge of the needle plate 8 on one side of the notch of the cutter of the needle plate 8; v represents the rotating speed of the sewing machine when the fourth sensor 7 detects that the cloth leaves; a represents the acceleration of the sewing machine; Δ t represents a time difference from when the third sensor 5 detects the departure of the cloth to when the fourth sensor 7 detects the departure of the cloth;
Figure BDA0002303585210000133
indicating rounding up.
In one embodiment, the back trimming control method of the sewing machine control system shown in fig. 4 can also be controlled by using the first sensor 3 and the second sensor 4. For example, the first sensor 3 and the second sensor 4 are used for detecting the cloth to obtain a third detection result; and performing post trimming control according to the third detection result.
In one embodiment, the performing post trimming control according to the third detection result includes: and determining the fifth trimming delay stitch number according to the third detection result, and sewing the fifth trimming delay stitch number after the first sensor 3 detects that the cloth leaves, and then performing post trimming.
In one embodiment, the determining the fifth number of line trimming delay pins according to the third detection result includes: determining the number of the fifth trimming delay pins N according to the following formulaRear end：
Figure BDA0002303585210000134
Wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002303585210000141
l' represents the distance from the second inductor 4 to the meshing surface 6 of the trimming cutter; d represents the current stitch length value of the sewing machine; y is1Represents the distance from the first inductor 3 to the second inductor 4; y is2Indicating the distance from the first inductor 3 to the edge of the needle board 8 on one side of the notch of the cutter of the needle board 8; v represents the rotational speed of the sewing machine when the second sensor 4 detects the cloth; a represents the acceleration of the sewing machine; Δ t represents a time difference from when the first sensor 3 detects the departure of the cloth to when the second sensor 4 detects the departure of the cloth;
Figure BDA0002303585210000142
indicating rounding up.
Embodiments of the invention will be described and illustrated below with reference to the preferred embodiments.
The parts related to the preferred embodiment of the invention comprise the following parts: the device comprises a sewing platform 1, a sensor 2, a sensor 3, a sensor 4, a sensor 5, a cutter meshing surface 6, a sensor 7, a needle plate 8, a controller, and related simulated fabric A, fabric B, fabric C and fabric D.
Preferred embodiment 1
As shown in figure 1, 3 sensors, namely a sensor 2, a sensor 3 and a sensor 4, are arranged on a sewing platform 1, a sensor 5 is arranged on a needle plate 8, a cutter meshing surface 6 is arranged at the rear end of the needle plate 8, and a sensor 7 is level to the cutter meshing surface 6. As shown in fig. 5, the inductor 2 and the inductor 4 are linearly distributed, the inductor 3 is offset from the inductor 2 and the inductor 4, and the linear direction of the two points of the inductor 3 and the inductor 4 forms a C-angle with the linear direction of the feeding direction. In order to solve the problem that front-end fabrics can be cut during front trimming, the triangular fabrics can have various shapes after being analyzed, and the triangular fabrics are classified into two types of fabrics A and B, namely the triangular included angle of the fabric A is set to be & lt B, and the angle of the triangular included angle is larger than & lt C of the arrangement of the sensor; the included angle of the triangle of the fabric B is < A, and the angle of the included angle is less than < C of the arrangement of the sensors. In the sewing process of the fabric A and the fabric B, a process that a triangular side line passes through the inductor 3 and the inductor 4 respectively appears. As shown in fig. 6, taking fabric a as an example, the fabric M firstly blocks the sensor 3, at this time, the controller records the signal of the sensor 3, and at this time, the fabric N in the direction of the straight line with the sensor 4 is1The point position is closer to the rear part of the needle plate 8 than the M point position, and the distance between the two is set to be L2. The fabric is sewn continuously from N1Point moves to N2The point and this time will block the sensor 4, at which time the controller will record the signal of the sensor 4. N is a radical of1Point sum N2The distance in the moving direction of the point is set to L1The exercise completion time is Δ t1When the current rotation speed is V and the acceleration is a, L1＝V×Δt1+aΔt1 2. Due to L1+L2The distance between the inductor 3 and the inductor 4 is constant, the initial speed of the M point is V at the moment, and the distance between the M point of the fabric moving from the inductor 3 to the inductor 4 in the linear direction is L1+L2Let the arrival time be Δ t2Then L is1+L2＝V×Δt2+aΔt2 2. From this, L can be solved1And L2The value of (c). From the principle of similar triangles, L2/x1＝y1/y2-y1. Therein is given by1Is the parallel direction distance between the inductor 3 and the inductor 4, y2The two values are known and customized for the distance of sensor 3 from the edge of the work piece. From this, X can be derived1The value of (c). In the same way, the movement direction distance C between the inductor 4 and the sharp corner of the triangular fabric can be obtained, and the distance from the inductor 4 to the trimming knife edge 6 is set to be L'. Therefore, on the basis of the existing thread cutting logic, the controller judges how to carry out thread cutting by judging the difference between the fabric distance C and the distance L' of the thread cutting knife edge 6. If the distance C is larger than L ', thread cutting is not executed, if the distance C is smaller than L ', thread cutting is executed, and the thread cutting delay needle number N1 is determined according to the ratio of the difference value of L ' and the distance C to the current needle pitch d of the sewing machine. Namely N1< L' -C/existing gauge, if N1If the yarn length is less than 1, the yarn cutting treatment is not carried out, so that the problem of cutting the fabric is solved. As shown in fig. 7, since the included angle of triangle a of the fabric B is smaller than angle C, the fabric B can firstly shield the sensor 4 and then shield the sensor 3 when sewing, so that the problem that prejudgment cannot be performed can be caused. In order to solve the problem and ensure that the fabric B type fabric can meet the requirement, the sensor 5 is arranged. When the fabric B is sewn, before the sensor 4 is shielded, the fabric can firstly shield the sensor 5 and then shield the sensor 4, so that the controller can judge that the fabric is of the fabric B type, and the included angle is smaller than the angle C, so that the front trimming action is not performed, and then the requirement that the fabric is not cut is met. As shown in fig. 8, the best position for placing the inductor 5 is the angle position between the straight extension line of the inductor 3 and the inductor 4 and the braided wire area, and is behind the notch 8 of the cutter of the needle plate 8. As shown in FIG. 9, the sensor 3 is preferably placed in a region from the front end of the notch 8 of the needle plate 8 to the sensor 4.
The back trimming triangular fabric is divided into the fabric C type and the fabric D type, and in order to ensure that the two types of fabrics C and D can avoid being trimmed off the back end fabric during back trimming, the sensor 5 and the sensor 7 are arranged for judgment. As shown in FIGS. 10 and 11, the inductor 5 is providedThe position straight line of the sensor 7 and the feeding direction straight line are an included angle D, wherein the triangular included angle of the fabric C is set to be E, under the condition that E is smaller than D, when the fabric C is sewn, the fabric C can firstly leave the sensor 7 and then leave the sensor 5, so that the type of the fabric is judged to be the fabric C, and X can be obtained by the same principle2Value of (1), thus the number of post trimming delay pins N2＞X2+L4Current gauge, controller set at N2And executing post-trimming action after the number of the needles is delayed. As shown in fig. 11, if the included angle of the triangle of the fabric D is ° F, then ° F is greater than ° D, when the fabric D starts to be sewn, the fabric D firstly leaves the sensor 5 and then leaves the sensor 7, and X can be obtained according to the same principle as above3And by the same token, N is obtained3＞X3Current needle pitch. At the moment, the minimum delay needle number N of sewing before leaving the inductor 7 can be set by electric control3And performing cloth shearing prevention. Wherein N is1、N2、N3Is an integer, and has a remainder plus 1.
The principle logic sequence for realizing the effect of the embodiment of the invention is as follows:
FIG. 20 is a flow chart of the front trimming control method according to the preferred embodiment of the present invention, as shown in FIG. 20, when sewing is started, if the fabric shields the sensor 3 and the sensor 4 in sequence, the electric control records the time of shielding the sensor 3 and the sensor 4, and calculates whether the shielding sensor 4 is faster than the normal sewing speed, if it is detected that the speed is faster than the normal sewing speed, it is determined that the fabric type is A, and the fabric type is N1And performing front trimming by compensating the delay stitch number. If N is present1If the number is less than 1, the thread trimming is not carried out. After sewing starts, if the fabric shields the sensor 4 and the sensor 3 in sequence, the electronic control can judge that the fabric being sewn at the moment is B fabric, and the front thread trimming action is not carried out at the moment.
Fig. 21 is a flowchart of a back trimming control method according to a preferred embodiment of the present invention, and as shown in fig. 21, the logic aspect of the back trimming: after the current thread cutting action is finished, if the fabric leaves the inductor 7 and then leaves the inductor 5, the fabric type is judged to be C, and the thread cutting delay needle number is N2Executing; after the execution of the current thread trimming action is completed,if the fabric leaves the sensor 5 and then leaves the sensor 7, and the leaving speed exceeds the normal sewing cloth feeding speed, the fabric type can be judged to be D fabric, and the thread cutting delay needle number is N3Executing;
preferred embodiment 2
As shown in fig. 4, 3 sensors, namely a sensor 2, a sensor 3 and a sensor 4, are arranged on the sewing platform 1, a sensor 5 is arranged on a needle plate 8, a cutter meshing surface 6 is arranged at the rear end of the needle plate 8, and a sensor 7 is parallel to the cutter meshing surface 6. As shown in fig. 12, the sensors 2 and 4 are linearly arranged in parallel to the sewing direction, and the sensors 3 and 4 are linearly arranged in perpendicular to the sewing direction. The linear distance between two points of the inductor 3 and the inductor 4 is known as L. In order to solve the problem that front-end fabrics can be cut during front trimming, the triangular fabrics can have various shapes after being analyzed, and the triangular fabrics are classified into two types of fabrics A and B, namely the triangular included angle of the fabric A is set to be & lt B, and the angle of the triangular included angle is larger than & lt C of the arrangement of the sensor; the included angle of the triangle of the fabric B is less than the angle C of the sensor arrangement. In the sewing process of the fabric A and the fabric B, a process that a triangular side line passes through the inductor 3 and the inductor 4 respectively appears. As shown in fig. 13, taking the fabric a as an example, the fabric N firstly blocks the sensor 4, at this time, the controller records the signal of the sensor 4, and at this time, the fabric N in the direction of the straight line with the sensor 4 is1The point position is on the same straight line with the position of the M point of the sensor 3, and the distance between the two is known as L. The fabric is sewn continuously from N1Moving a point to N2And at this point, the sensor 4 will be continuously shielded, and the sensor 3 will be shielded by the fabric M point, and the controller will record the signal of the sensor 3 at this time. N is a radical of1Point sum N2The distance in the moving direction of the point is set to L1When the exercise completion time is Δ t, the current rotation speed is V, and the acceleration is a, then L1＝VΔt+aΔt2. Due to y1And y2Is a distance constant of known value, and therefore, can be derived from the principle of similar triangles1/d1＝y1/y2From this, d can be derived1The value of (c). In the same way, d can be obtained2＝L1+d1. Thereby being capable of realizing the purpose of cutting the thread on the basis of the existing thread cutting logicThe controller judges the fabric distance d2The difference in distance from the trimming edge 6 is used to determine how trimming is to be performed, and the distance from the trimming edge 6 is set to be L'. If the distance d2If the distance is larger than L ', the thread trimming is not executed, and if the distance d is larger than L', the thread trimming is not executed2If less than L', trimming is performed and the trimming is delayed by the number of pins N1According to the ratio of the difference value of L' and the distance d2 to the current needle pitch d of the sewing machine. Namely N1＜L’-d2Existing needle pitch, if N1If the yarn length is less than 1, the yarn cutting treatment is not carried out, so that the problem of cutting the fabric is solved. As shown in fig. 14, since the included angle of triangle a of the fabric B is smaller than the angle C, the fabric B can firstly shield the sensor 3 and then shield the sensor 4 when sewing, but due to the angle problem, the sensor 5 can be directly shielded, so that the problem that the prejudgment cannot be performed can be caused. In order to solve the problem, the shielding logic of the sensor 5 is set for judging to ensure that the fabric B type can meet the requirement. When the fabric B is sewn, before the sensor 4 is shielded, the fabric can firstly shield the sensor 5 and then shield the sensor 4, so that the controller can judge that the fabric is of the type of the fabric B, and the included angle of the fabric is smaller than C, so that the front trimming action is not carried out, and then the requirement that the fabric is not cut is met. As shown in FIG. 15, the best position for placing the sensor 5 is generally the linear angle A between the sensor 4 and the sewing direction of the needle plate 8, the angle A is generally between 15 and 45 degrees, and is behind the notch 8 of the cutter of the needle plate 8. As shown in FIG. 16, the sensors 3 and 4 are preferably placed in the region from the front end of the cutting notch 8 of the needle board 8 to the start of the auxiliary notch of the needle board 8.
The back trimming triangular fabric is divided into the fabric C type and the fabric D type, and in order to ensure that the two types of fabrics C and D can avoid being trimmed off the back end fabric during back trimming, the sensor 5 and the sensor 7 are arranged for judgment. As shown in fig. 17 and fig. 18, the position straight lines of the sensor 5 and the sensor 7 are arranged to form an included angle ≧ D with the feeding direction straight line, wherein the triangular included angle of the fabric C is ≦ E, and then the ≦ E is less than ≦ D, when the fabric C is being sewn, the fabric C firstly leaves the sensor 7 and then leaves the sensor 5, so as to determine that the fabric type is the fabric C, and by the same method, X can be obtained2Value of (D), thus the number of post-trimming delay pins N2＞X2+L4Current needle pitch, controller set at N2And executing post-trimming action after the number of the needles is delayed. As shown in fig. 18, if the included angle of the triangle of the fabric D is ° F, then ° F is greater than ° D, when the fabric D starts to be sewn, the fabric D firstly leaves the sensor 5 and then leaves the sensor 7, and X can be obtained according to the same principle as above3And by the same token, N is obtained3＞X3Current gauge. At the moment, the minimum delay needle number N of sewing before after leaving the inductor 7 can be set by electric control3And performing cloth shearing prevention. Wherein N is1、N2、N3Is an integer, and has a remainder plus 1.
Meanwhile, the sensor 3 and the sensor 4 can also be used for judging and realizing the trimming of the back trimming triangular fabric, as shown in fig. 19. By the same method, L can be calculated6To thereby yield d3A value of (d)3The value and the current known sewing parameter condition can carry out delay thread cutting on the back thread cutting of the triangular fabric. Let the number of delay pins implemented be N4Then N is4＞d3And if the remainder exists, adding 1 to the current stitch length.
The principle logic sequence for realizing the effect of the embodiment of the invention is as follows:
fig. 20 is a flowchart of a front trimming control method according to a preferred embodiment of the present invention, and as shown in fig. 20, when the fabric covers the sensor 5 and then covers the sensor 3 after the sewing is started, it is determined as a triangular fabric, and it is determined as a B fabric. If the fabric shields the sensor 3 and then the sensor 4, the fabric is determined to be a triangular fabric, and the fabric is determined to be an A fabric. If the shielding sensor 4 and the sensor 3 are judged to be shielded simultaneously, the front end of the fabric is flush. If the fabric is A, press N1Pre-trimming is performed to compensate for the number of delayed stitches. If N is present1If the number is less than 1, the thread cutting processing is not carried out. When sewing is started, if the electronic control judges that the fabric is sewn as the B fabric, the front thread trimming action is not performed at the moment.
Fig. 21 is a flowchart of a rear trimming control method according to a preferred embodiment of the present invention, and as shown in fig. 21, the rear trimming logic aspect: after the execution of the current thread cutting action is finished, if the thread cutting action is finished, the thread cutting action is finishedThe material leaves the inductor 7 and then leaves the inductor 5, the type of the fabric is judged to be C, and the number of thread cutting delay needles is N2Executing; after the current thread cutting action is finished, if the fabric leaves the sensor 5 and then leaves the sensor 7 at a speed exceeding the normal sewing cloth feeding speed, the fabric type can be judged to be D, and the thread cutting delay needle number is N3Executing;
in the preferred embodiment, there is also provided a preferred post-trimming method: after the current thread cutting action is executed and completed, whether the fabric is C or D, the fabric must be separated from the inductor 4 and then the inductor 3, and at the moment, the fabric can be separated from the inductor 3 through N4The number of stitches is delayed to perform post trimming.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (14)

1. A sewing machine control system, comprising: the device comprises a first inductor (3), a second inductor (4) and a controller; the first inductor (3) and the second inductor (4) are respectively coupled with the controller, wherein the first inductor (3) and the second inductor (4) are arranged on a sewing table (1) of the sewing machine, and a straight line where the first inductor (3) and the second inductor (4) are located forms a preset included angle with the feeding direction of the sewing machine; the controller is used for determining whether the second inductor (4) detects cloth before the first inductor (3) according to first detection results of the first inductor (3) and the second inductor (4); under the condition that the second sensor (4) detects the cloth before the first sensor (3), front trimming is not executed; otherwise, determining a first trimming delay stitch number according to the first detection result, and executing front trimming after sewing the first trimming delay stitch number after the second sensor (4) detects the cloth.
2. The sewing machine control system of claim 1, further comprising: a third inductor (5) and a fourth inductor (7), the third inductor (5) and the fourth inductor (7) being coupled to the controller, respectively; the third inductor (5) is arranged at the tail end of the needle plate (8) and is positioned on one side of a meshing surface (6) of a thread cutting cutter of the sewing machine; the fourth inductor (7) is arranged on the sewing table (1) and is positioned on an extension line of the meshing surface (6) of the thread cutting knife; the controller is further used for performing rear trimming control according to second detection results of the third sensor (5) and the fourth sensor (7).
3. The sewing machine control system of claim 1, further comprising: a fifth inductor (2), the fifth inductor (2) being coupled with the controller; wherein the fifth inductor (2) is arranged on the sewing table (1).
4. The sewing machine control system of any of claims 1-3, wherein the predetermined included angle is 90 °.
5. A sewing machine control method of a sewing machine control system, the sewing machine control system comprising: the device comprises a first inductor (3), a second inductor (4) and a controller; the first inductor (3) and the second inductor (4) are respectively coupled with the controller, wherein the first inductor (3) and the second inductor (4) are arranged on a sewing table (1) of the sewing machine, and a straight line where the first inductor (3) and the second inductor (4) are located and the feeding direction of the sewing machine form a preset included angle, and the control method of the sewing machine is characterized by comprising the following steps of:
detecting the cloth through the first inductor (3) and the second inductor (4) to obtain a first detection result;
according to the first detection result, determining whether the second inductor (4) detects cloth before the first inductor (3); when the second sensor (4) detects cloth before the first sensor (3) detects the cloth, front trimming is not executed; otherwise, determining a first trimming delay stitch number according to the first detection result, and executing front trimming after sewing the first trimming delay stitch number after the second sensor (4) detects the cloth.
6. The sewing machine control method according to claim 5, wherein performing the front cut control based on the first detection result in a case where the predetermined angle is 90 ° includes:
judging whether the front end of the cloth exceeds a meshing surface (6) of a trimming cutter or not when the second sensor (4) detects the cloth according to the first detection result;
when the fact that the front end of the cloth exceeds the meshing surface (6) of the thread trimming cutter when the second sensor (4) detects the cloth is judged, front thread trimming is not executed; otherwise, determining a second trimming delay needle number according to the first detection result, and sewing the second trimming delay needle number after the first sensor (3) detects the cloth, and then executing front trimming.
7. The sewing machine control method according to claim 6, wherein determining a second number of trimming delay stitches based on the first detection result includes:
determining the second trimming delay pin number N according to the following formulaFront side：
Figure FDA0003674570130000031
Wherein the content of the first and second substances,
Figure FDA0003674570130000032
l' represents the distance from the second inductor (4) to the meshing surface (6) of the thread cutting knife; d represents the current stitch length value of the sewing machine; y is1Represents the distance of the first inductor (3) to the second inductor (4); y is2Indicating the distance from the first inductor (3) to the edge of the needle plate (8) on one side of the cutting notch of the needle plate (8); v represents the rotating speed of the sewing machine when the second sensor (4) detects cloth; a represents an acceleration of the sewing machine; Δ t represents a time difference from the detection of the cloth by the second sensor (4) to the detection of the cloth by the first sensor (3);
Figure FDA0003674570130000033
indicating a rounding down.
8. The sewing machine control method according to claim 5, wherein the sewing machine control system further comprises: a third inductor (5) and a fourth inductor (7), the third inductor (5) and the fourth inductor (7) being coupled to the controller, respectively; the third inductor (5) is arranged at the tail end of the needle plate (8) and is positioned on one side of a thread cutting cutter meshing surface (6) of the sewing machine; the fourth inductor (7) is arranged on the sewing table (1) and is positioned on an extension line of the meshing surface (6) of the thread cutting cutter; after performing the front cut control according to the first detection result, the sewing machine control method further includes:
detecting the cloth through the third inductor (5) and the fourth inductor (7) to obtain a second detection result;
and performing post trimming control according to the second detection result.
9. The sewing machine control method according to claim 8, wherein performing post-cut control according to the second detection result includes:
according to the second detection result, judging whether the fourth sensor (7) detects that the cloth leaves before the third sensor (5);
when the fourth sensor (7) detects that the cloth leaves before the third sensor (5) is judged, determining a third trimming delay needle number according to the first detection result, and sewing the third trimming delay needle number after the third sensor (5) detects that the cloth leaves, and then performing post trimming; otherwise, determining a fourth trimming delay needle number according to the first detection result, and executing the rear trimming after sewing the fourth trimming delay needle number after the fourth sensor (7) detects that the cloth leaves.
10. The sewing machine control method according to claim 9, wherein determining a third number of trimming delay stitches based on the first detection result includes:
determining the third trimming delay pin number N according to the following formulaRear end：
Figure FDA0003674570130000041
Wherein, the first and the second end of the pipe are connected with each other,
Figure FDA0003674570130000042
L4the distance from the third inductor (5) to the meshing surface (6) of the thread cutting cutter is shown; d represents the current needle pitch value of the sewing machine; y is3Represents the distance of the fourth inductor (7) to the third inductor (5) in the feeding direction; y is4Indicating the distance from the third inductor (5) to the edge of the needle plate (8) at one side of the cutting notch of the needle plate (8); v represents the rotating speed of the sewing machine when the fourth sensor (7) detects that the cloth leaves; a represents an acceleration of the sewing machine; Δ t represents a time difference from when the fourth sensor (7) detects the departure of the cloth to when the third sensor (5) detects the departure of the cloth;
Figure FDA0003674570130000043
indicating rounding up.
11. The sewing machine control method according to claim 9, wherein determining a fourth number of trimming delay stitches based on the first detection result includes:
determining the fourth trimming delay pin number N according to the following formulaRear end：
Figure FDA0003674570130000044
Wherein, the first and the second end of the pipe are connected with each other,
Figure FDA0003674570130000045
L4the distance between the third inductor (5) and the meshing surface (6) of the thread cutting cutter is shown; d represents the current needle pitch value of the sewing machine; y is3Represents the distance of the fourth inductor (7) to the third inductor (5) in the feeding direction; y is4Indicating the distance from the third inductor (5) to the edge of the needle plate (8) on one side of the cutting notch of the needle plate (8); v represents the rotating speed of the sewing machine when the fourth sensor (7) detects that the cloth leaves; a represents an acceleration of the sewing machine; Δ t represents a time difference from when the third sensor (5) detects the departure of the cloth to when the fourth sensor (7) detects the departure of the cloth;
Figure FDA0003674570130000051
indicating rounding up.
12. The sewing machine control method according to claim 5, wherein in the case where the predetermined angle is 90 °, after the front cut control is performed based on the first detection result, the sewing machine control method further comprises:
detecting the cloth through the first inductor (3) and the second inductor (4) to obtain a third detection result;
and performing rear trimming control according to the third detection result.
13. The sewing machine control method according to claim 12, wherein performing the post-cut control based on the third detection result includes:
and determining a fifth trimming delay stitch number according to the third detection result, and sewing the fifth trimming delay stitch number after the first sensor (3) detects that the cloth leaves, and then performing post trimming.
14. The sewing machine control method according to claim 13, wherein determining a fifth number of trimming delay stitches based on the third detection result includes:
determining the number N of the fifth trimming delay pins according to the following formulaRear end：
Figure FDA0003674570130000052
Wherein, the first and the second end of the pipe are connected with each other,
Figure FDA0003674570130000053
l' represents the distance from the second inductor (4) to the meshing surface (6) of the thread cutting cutter; d represents the current stitch length value of the sewing machine; y is1Represents the distance of the first inductor (3) to the second inductor (4); y is2The distance from the first inductor (3) to the edge of the needle plate (8) positioned on one side of the notch of the cutter of the needle plate (8) is shown; v represents the rotating speed of the sewing machine when the second sensor (4) detects cloth; a represents an acceleration of the sewing machine; Δ t represents a time difference from when the first sensor (3) detects the departure of the cloth to when the second sensor (4) detects the departure of the cloth;
Figure FDA0003674570130000054
indicating rounding up.
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