Visual adjustment control method for a hem

Abstract

The application discloses a visual adjustment control method for a lower hem machine, in the first time of trial sewing, a processor processes a sewing line image to obtain an actual feeding needle pitch and sends the actual feeding needle pitch to a controller; in the second time of trial sewing, the controller sends an instruction to a feeding tooth driving source according to an absolute difference value between the actual feeding needle pitch and an auxiliary feeding needle pitch of a deviation rectifying conveying wheel, adjusts a feeding needle pitch of a machine head, then the processor processes the sewing line image to obtain an actual feeding needle pitch first adjustment value and sends the actual feeding needle pitch first adjustment value to the controller, the controller judges whether the absolute difference value between the actual feeding needle pitch first adjustment value and the auxiliary feeding needle pitch of the deviation rectifying conveying wheel is less than a set threshold value, if yes, feeding adjustment is completed; in formal sewing, the processor processes a sewing line image in real time to obtain a sewing line position, compares the sewing line position with a needle position and judges whether the needle is on a straight line where the sewing line is located; when the needle is outside the straight line where the sewing line is located, the processor sends a deviation rectifying signal to the controller, the controller controls a deviation rectifying motor to act, and adjusts the sewing line position.

Description

Technical Field

[0001] This invention belongs to the field of hemless machine technology, specifically relating to a visual adjustment and control method for hemless machines. Background Technology

[0002] The fully automatic hem rolling machine is a type of automated equipment widely used in the garment processing industry. It is mainly used to roll, fold, and sew the hem edges of garment pieces (such as trouser legs and cuffs). During the sewing process, in order to achieve "overlapping lines" (i.e., the starting stitch and the ending stitch are precisely aligned on the track), the conveying position of the fabric hem needs to be adjusted by the correction component.

[0003] Currently, as shown in the attached diagram Figures 1-3 As shown, the commonly seen fully automatic hem correction machine on the market includes a correction transmission wheel 101. Multiple sets of correction belts are mounted on the correction transmission wheel 101. Each set of correction belts includes a winding gear, a winding wheel, a support wheel, a worm gear, and two correction belts 104. The winding gear, winding wheel, support wheel, and worm gear are all rotatably connected to the correction transmission wheel 101. The two correction belts 104 are both annular and arranged along the axial direction of the correction transmission wheel 101 on its surface, and are sequentially wound around the winding gear, support wheel, and worm gear. Between the wheels, the transmission shaft 105, which is fixed at one end of the correction transmission wheel 101, is connected to the output shaft of the transmission motor 102 via a synchronous belt. A correction shaft, which is rotatably connected to the transmission shaft 105, is inserted inside the transmission shaft 105. One end of the correction shaft is connected to the output shaft of the correction motor 103, and the other end of the correction shaft extends into the correction transmission wheel 101 and is fitted with and fixed with a worm gear. The worm wheel and worm gear of each set of correction belts mesh with the corresponding wound gear. The fabric hem 5 is wound between the fabric feeding wheel 8 and the correction transmission wheel 101.

[0004] During the sewing process, the feed stitch distance for the fabric hem includes the head feed stitch distance T1 and the guide wheel auxiliary feed stitch distance T2. The head feed stitch distance T1 is adjusted by regulating the feed teeth and only represents the feed stitch distance for a narrow range of fabric hem at the presser foot position. The guide wheel auxiliary feed stitch distance T2 is adjusted by regulating the rotation speed of the guide wheel and represents the feed stitch distance for the entire width of the fabric hem. However, after the design change, due to the change in the characteristics of the fabric hem, the head feed stitch distance T1 and the guide wheel auxiliary feed stitch distance T2 often become mismatched (i.e., inconsistent). This causes the fabric hem to be stretched, resulting in unstable feeding and causing the stitch position of the fabric hem to deviate, easily leading to stitching failure. In this case, it is necessary to adjust the head feed stitch distance T1 to match it with the guide wheel auxiliary feed stitch distance T2. However, the current problem is that it is difficult to determine whether the feed pin pitch T1 of the machine head matches the auxiliary feed pin pitch T2 of the correction conveyor wheel, often requiring extensive testing, which is time-consuming and labor-intensive. Therefore, the commonly available fully automatic hem-dropping machines on the market suffer from long debugging times when changing models.

[0005] In addition, as shown in the attached figure Figures 1-3 As shown, the commonly available fully automatic hem correction machines mainly use a photoelectric sensor 11 in conjunction with a correction assembly to correct the fabric hem 5, thereby controlling the hemline. The photoelectric sensor 11 is located on one side of the correction conveyor wheel 101. The light emitted by the photoelectric sensor 11 illuminates a point near one end of the correction conveyor wheel 101. The intersection of the light path 1101 formed by the light emitted by the photoelectric sensor 11 and the correction conveyor wheel 101 is defined as the control point. The specific working principle of the fabric hem 5 correction using the photoelectric sensor 11 and the correction assembly is as follows: after the fabric hem 5 is folded, the edge 502 of the fabric hem at the correction conveyor wheel 101 will retract under the correction action of multiple correction belts 104. At the control point, the photoelectric sensor 11 detects the fabric hem edge 502 at the correction conveyor wheel 101 at regular intervals and transmits the detection signal to the controller. When the fabric hem edge 502 at the correction conveyor wheel 101 is detected to be off-center or beyond the control point, the controller controls the correction motor 103 to drive each correction belt 104 to move along the axial direction of the correction conveyor wheel 101. Using the static friction between each correction belt 104 and the fabric hem 5, the fabric hem edge 502 at the correction conveyor wheel 101 is kept near the control point. At the same time, under the transmission action of the correction conveyor wheel 101, the stitch 501 (i.e. the starting stitch) formed on the fabric hem 5 can smoothly transition to below the needle 4, thereby achieving double stitching.

[0006] However, the above-mentioned re-stitch control method has obvious technical defects. This method indirectly controls the stitch position of the fabric hem by detecting the position of the fabric hem edge 502 and using the fabric hem edge 502 as a reference to achieve the purpose of re-stitching. However, the distance between the fabric hem stitch 501 and the fabric hem edge 502 is not always fixed. In actual processing, especially when processing thin or soft fabrics, the upper and lower layers of fabric hem 5 often cannot fit tightly after folding, easily forming a hollow arch. At this time, the theoretical stitch position of the fabric hem indirectly calculated by the fabric hem edge 502 detected by the photoelectric sensor 11 does not match the actual stitch position of the fabric hem. When the correction control is performed based on this incorrect stitch position information, it often leads to re-stitching failure, resulting in a low overall re-stitching rate of the same fabric hem, which affects the sewing quality and production efficiency.

[0007] Additionally, as shown in the attached diagram Figures 1-3 As shown, the commonly available fully automatic hem-dropping machines have a boning roller 12 on one side of the needle 4 that presses against the hem 5 of the fabric. The boning roller 12 is fixedly connected to the boning detection plate 13 located above the hem 5 of the fabric. A boning sensor 14 is located above the boning detection plate 13, which is a position sensor. Before sewing, the fabric hem 5 is conveyed between the feed roller 8 and the guide roller 101. When the fabric hem bodice 503 (i.e. the seam of the fabric hem 5) is conveyed to the position of the bodice roller 12, the bodice roller 12 will be slightly lifted upwards and drive the bodice detection plate 13 to be slightly lifted upwards because the fabric hem bodice 503 is relatively thick. The bodice sensor 14 detects that the vertical distance between it and the bodice detection plate 13 has become smaller, and then identifies the bodice signal and sends it to the controller. The controller combines the horizontal distance between the bodice roller 12 and the needle 4 along the conveying direction of the fabric hem 5 and the feeding speed of the fabric hem 5 to determine the moment when the fabric hem bodice 503 reaches below the needle 4 and controls the needle 4 to start sewing at the corresponding moment.

[0008] However, the detection method relying on the mechanical contact type boning roller 12 has obvious technical defects. For example, when the hem 5 of the fabric is uneven, when the thicker folds or overlapping parts in the non-boning area are transferred to the position of the boning roller 12, it will also cause the boning roller 12 to lift slightly upward, thereby causing false boning detection and affecting the accuracy of sewing timing. Summary of the Invention

[0009] In view of the above-mentioned deficiencies of the prior art, the present invention provides a visual adjustment and control method for hem machines, which can reduce the time for changing and debugging, and can effectively improve the overall re-stitch rate of the hem of the same fabric by directly and in real-time detecting the seam position of the fabric hem and directly controlling the re-stitch based on the machine needle.

[0010] The technical solution adopted by this invention to solve its technical problem is:

[0011] A visual adjustment and control method for a hem-shaped fabric hem is disclosed, comprising a visual adjustment and control system for the hem-shaped fabric hem, wherein the visual adjustment and control system includes a visual sensor and a controller. The visual sensor includes an industrial camera, a light source, and a processor. The industrial camera and the light source are located above the seam of the hem of the fabric. The industrial camera is communicatively connected to the signal input terminal of the processor. The signal output terminal of the processor is communicatively connected to the signal input terminal of the controller. The signal output terminal of the controller is communicatively connected to the feed tooth drive source and the correction motor of the hem-shaped fabric hem.

[0012] The visual adjustment and control method for the heel counter includes the following steps:

[0013] S1. When performing the first trial sewing on the hem of the changed fabric, the industrial camera collects the seam image data of the hem of the fabric and transmits it to the processor for processing to obtain the actual feeding stitch distance T3 and send it to the controller. The controller uses the absolute difference between the actual feeding stitch distance T3 and the determined correction conveyor wheel auxiliary feeding stitch distance T2 as the first adjustment amount △t1 of the machine head feeding stitch distance T1.

[0014] S2. During the second trial stitch, the controller first sends a corresponding action command to the feed tooth drive source according to the first adjustment amount △t1, so as to adjust the feed needle distance T1 of the machine head to T1±△t1 and use it as the first adjustment value T of the feed needle distance of the machine head. 1-1 The industrial camera then captures seam image data of the fabric hem and transmits it to the processor for processing to obtain the first adjustment value T of the actual feed stitch distance. 3-1 And send it to the controller, which determines the actual feeding needle pitch first adjustment value T. 3-1 If the absolute difference between the feed needle distance T2 of the correction conveyor wheel and the feed needle distance T2 is less than the set threshold △T, then the feed adjustment of the fabric hem is completed.

[0015] S3. During the formal sewing process, the industrial camera collects the seam image data of the fabric hem in real time and transmits it to the processor for processing to obtain the seam position of the fabric hem and compares it with the position of the needle of the hem machine to determine in real time whether the needle is on the straight line of the fabric hem.

[0016] S4. When the processor determines that the needle is outside the straight line of the fabric hem, the processor sends a correction signal to the controller, and the controller controls the correction motor to adjust the conveying position of the fabric hem, thereby adjusting the position of the fabric hem.

[0017] Furthermore, step S2 also includes: the controller determining the actual feeding needle distance first adjustment value T. 3-1If the absolute difference between the actual feeding needle distance T2 and the auxiliary feeding needle distance T2 of the correction conveyor wheel is less than the set threshold △T, then adjust the actual feeding needle distance to the first adjustment value T. 3-1 K times the absolute difference between the feed needle pitch T2 of the correction conveyor wheel and the feed needle pitch of the machine head is used as the first adjustment value T of the feed needle pitch. 1-1 The second adjustment amount Δt2;

[0018] Between steps S2 and S3, there is also step S23: During the third trial stitch, the controller first sends a corresponding action command to the feed tooth drive source according to the second adjustment amount △t2. The feed tooth drive source drives the feed tooth to perform the corresponding action to adjust the first adjustment value T of the machine head feed needle distance. 1-1 Adjust to T 1-1 ±△t2 is used as the second adjustment value T for the feed needle distance at the machine head. 1-2 The industrial camera then captures seam image data of the fabric hem and transmits it to the processor for processing to obtain the actual feed stitch distance second adjustment value T. 3-2 The data is then sent to the controller, which determines the actual feed needle pitch second adjustment value T. 3-2 When the absolute difference between the feed needle distance T2 of the correction conveyor wheel and the feed needle distance T2 is less than the set threshold △T, the feed adjustment of the fabric hem is completed.

[0019] Furthermore, it also includes step S5: the processor determines in real time whether the needle is on the straight line of the seam at the hem of the fabric. When the processor determines that the needle is on the straight line of the seam at the hem of the fabric, the processor sends a stop correction signal to the controller, and the controller controls the correction motor to stop operating.

[0020] Furthermore, the industrial camera and light source are arranged close to the needle, and the signal output terminal of the controller is also communicatively connected to the needle drive source of the hem machine.

[0021] Step S23-2 is included between steps S23-1 and S3: Before formal sewing, the hem of the fabric is conveyed between the correction conveyor wheel and the feed wheel. The industrial camera collects image data including the needle and the hem of the fabric and transmits it to the processor. When the processor receives image data that the hem of the fabric is below the needle, the processor sends a start sewing signal to the controller. The controller controls the needle drive source to move, and the needle drive source drives the needle to start sewing.

[0022] Further, in step S2: the controller determines the actual feeding needle distance first adjustment value T. 3-1 If the absolute difference between the feed needle pitch T2 and the auxiliary feed needle pitch T2 of the correction conveyor wheel is less than the set threshold △T, then calculate the first adjustment value T of the actual feed needle pitch. 3-1The absolute difference N between the first adjustment amount Δt1 and the actual feeding needle distance T3 is used as the linear proportional coefficient K, and the ratio between the first adjustment amount Δt1 and the absolute difference N is used as the first adjustment value T of the actual feeding needle distance. 3-1 K times the absolute difference between the feed needle pitch T2 of the correction conveyor wheel and the feed needle pitch of the machine head is used as the first adjustment value T of the feed needle pitch. 1-1 The second adjustment amount △t2.

[0023] Furthermore, in step S1: if T1 < T2, then T3 < T2, and T3 > T1, where Δt1 = T2 - T3;

[0024] In step S2: Adjust the feed needle distance T1 of the machine head to T1 + Δt1 = T 1-1 Where T3 < T 3-1 T 3-1 <T2, N=T 3-1 -T3, K=(T2-T3) / N, △t2=(T2-T 3-1 )×K;

[0025] In step S23: Adjust the first value T of the feed needle pitch of the machine head. 1-1 Adjust to T 1-1 +△t2=T 1-2 T 3-1 <T 3-2 T2-T 3-2 <△T.

[0026] Furthermore, in step S1: if T1 > T2, then T3 > T2 and T3 < T1, where Δt1 = T3 - T2;

[0027] In step S2: Adjust the feed needle distance T1 of the machine head to T1 - Δt1 = T 1-1 Where T3 > T 3-1 T 3-1 >T2, N=T3-T 3-1 K=(T3-T2) / N, △t2=(T 3-1 -T2)×K;

[0028] In step S23: Adjust the first value T of the feed needle pitch of the machine head. 1-1 Adjust to T 1-1 -△t2=T 1-2 T 3-1 >T 3-2 T 3-2 -T2<△T.

[0029] Further, in step S2: the controller first sends a corresponding action command to the feed tooth drive source according to the first adjustment amount △t1, so as to adjust the feed tooth pitch T1 of the machine head to T1±△t1. Specifically, the controller first sends a corresponding action command to the feed tooth drive source according to the first adjustment amount △t1, and the feed tooth drive source drives the feed tooth to perform corresponding actions to adjust the horizontal feed amount of the feed tooth, thereby adjusting the feed tooth pitch T1 of the machine head to T1±△t1.

[0030] Further, step S4 specifically involves: when the processor determines that the needle is located between the straight line of the fabric hem and the edge of the fabric hem, the processor sends a correction signal to the controller. The controller controls the correction motor to move, thereby driving each correction belt to move along the axis of the correction conveyor wheel towards the direction closer to the edge of the fabric hem. By utilizing the static friction between each correction belt and the fabric hem, the fabric hem is moved towards the direction closer to the edge of the fabric hem, thereby adjusting the conveying position of the fabric hem and thus adjusting the stitch position of the fabric hem.

[0031] Further, step S4 specifically involves: when the processor determines that the straight line of the fabric hem is located between the needle and the edge of the fabric hem, the processor sends a correction signal to the controller. The controller controls the correction motor to move, thereby driving each correction belt to move away from the edge of the fabric hem along the axis of the correction conveyor wheel. By utilizing the static friction between each correction belt and the fabric hem, the fabric hem is moved away from the edge of the fabric hem to adjust the conveying position of the fabric hem, thereby adjusting the position of the fabric hem's stitches.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] The visual adjustment and control method for the hem machine in this invention allows for precise adjustment of the actual feed stitch distance T3 during the first trial sewing. The absolute difference between the actual feed stitch distance T3 and the predetermined auxiliary feed stitch distance T2 of the correction conveyor wheel is used as the first adjustment amount Δt1 of the machine head feed stitch distance T1. This enables precise adjustment of the machine head feed stitch distance T1 during the second trial sewing, and the actual feed stitch distance T3 is correspondingly precisely adjusted along with the machine head feed stitch distance T1. The first adjustment value T of the actual feed stitch distance is obtained through the visual sensor. 3-1 By comparing the obtained actual feed needle pitch first adjustment value T 3-1 Given the already determined auxiliary feeding pin pitch T2 of the correction conveyor wheel, if the actual feeding pin pitch first adjustment value T is determined... 3-1 If the absolute difference between the feed needle pitch T2 and the auxiliary feed needle pitch T2 of the correction conveyor wheel is less than the set threshold △T, then the first adjustment value T of the actual feed needle pitch is... 3-1The feed needle pitch T2 of the guide wheel has been matched with the already determined auxiliary feed needle pitch of the machine head. Accordingly, the first adjustment value T of the feed needle pitch of the machine head has been adjusted. 1-1 The feed needle pitch T2 of the guide wheel has been matched with the actual feed needle pitch first adjustment value T. 3-1 It can quickly match the determined auxiliary feeding needle pitch T2 of the correction conveyor wheel, and the first adjustment value T of the head feeding needle pitch. 1-1 It can also be quickly matched with the determined auxiliary feeding pin pitch T2 of the correction conveyor wheel, so as to reduce the time for changeover and debugging. And because the actual feeding pin pitch first adjustment value T 3-1 The first adjustment value T of the feed needle pitch at the machine head 1-1 All of these are matched with the auxiliary feeding stitch distance T2 of the correction conveyor wheel. This ensures the stability of the feeding process during the subsequent formal sewing process, preventing the seam position of the fabric hem from deviating and ensuring the re-stitching effect. During the formal sewing process, by directly and in real-time detecting the seam position of the fabric hem and directly controlling the re-stitching based on the machine needle, it avoids the technical defects in the background technology where the theoretical seam position of the fabric hem indirectly calculated by the photoelectric sensor due to the hollow arching of the upper and lower layers of the fabric hem does not match the actual seam position of the fabric hem. The re-stitching failure is caused by the correction control based on this incorrect seam position information. This effectively improves the overall re-stitching rate of the same fabric hem, thereby ensuring the sewing quality and production efficiency of the fabric hem. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of a fully automatic swing-down machine in the background technology;

[0035] Figure 2 for Figure 1 A partially enlarged structural diagram;

[0036] Figure 3 for Figure 1 A magnified schematic diagram of the structure behind the hidden fabric hem;

[0037] Figure 4 This is a three-dimensional structural diagram of a swing machine including the swing machine visual adjustment control system of the present invention;

[0038] Figure 5 for Figure 4 A partially enlarged structural diagram;

[0039] Figure 6 for Figure 4 A magnified schematic diagram of the structure behind the hidden fabric hem;

[0040] Figure 7 for Figure 4 A schematic diagram of the three-dimensional structure from another direction;

[0041] Figure 8 for Figure 7 A partially enlarged structural diagram;

[0042] Figure 9 This is a flowchart of the visual adjustment and control method for the swing mechanism in this invention.

[0043] The following are the labeling symbols in the diagram: 101, guiding conveyor wheel; 102, conveyor motor; 103, guiding motor; 104, guiding belt; 105, conveyor shaft; 201, industrial camera; 20101, field of view; 202, light source; 3, needle plate; 4, machine needle; 5, fabric hem; 501, sewing thread; 502, fabric hem edge; 503, fabric hem boning position; 6, machine head; 7, support; 8, feed roller; 9, motor base; 10, platform; 11, photoelectric sensor; 1101, optical path; 12, boning roller; 13, boning detection plate; 14, boning sensor. Detailed Implementation

[0044] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0045] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] A visual adjustment and control method for a hem machine, which employs a visual adjustment and control system for the hem machine for adjustment and control, such as... Figures 4-8As shown, the hem correction assembly of the hem machine includes a correction conveyor wheel 101, multiple sets of correction belts, a conveyor motor 102, and a correction motor 103. Each set of correction belts includes two correction belts 104. The conveyor motor 102 and the correction motor 103 are fixed to the platform 10 of the hem machine via a motor mount 9. The hem machine vision adjustment control system includes a vision sensor and a controller. The vision sensor includes an industrial camera 201, a light source 202, and a processor. The industrial camera 201 and the light source 202 are located above the seam 501 of the hem 5. The industrial camera 201 is connected to the signal input terminal of the processor, the signal output terminal of the processor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the feed tooth drive source of the hem machine and the correction motor 103.

[0048] like Figure 9 As shown, the visual adjustment and control method for the hem machine includes the following steps:

[0049] S1. When the fabric hem 5 after the change is first test-sewn, when the seam 501 of the fabric hem 5 enters the field of view 20101 of the industrial camera 201, the industrial camera 201 collects the seam image data of the fabric hem 5 and transmits it to the processor for processing to obtain the actual feeding needle distance T3 and send it to the controller. The controller uses the absolute difference between the actual feeding needle distance T3 and the determined auxiliary feeding needle distance T2 of the correction conveyor wheel as the first adjustment amount △t1 of the machine head feeding needle distance T1.

[0050] S2. When performing a second trial sewing on the hem 5 of the changed fabric, the controller first sends a corresponding action command to the feed tooth drive source according to the first adjustment amount △t1, so as to adjust the feed needle distance T1 of the machine head to T1±△t1 and use it as the first adjustment value T of the feed needle distance of the machine head. 1-1 Then, when the seam 501 of the fabric hem 5 enters the field of view 20101 of the industrial camera 201, the industrial camera 201 acquires the seam image data of the fabric hem 5 and transmits it to the processor for processing to obtain the first adjustment value T of the actual feed stitch distance. 3-1 The data is then sent to the controller, which determines the actual feed needle pitch, first adjustment value T. 3-1 If the absolute difference between the feed needle distance T2 of the correction conveyor wheel and the feed needle distance T2 is less than the set threshold △T, then the feed adjustment of the fabric hem 5 is completed.

[0051] S3. During formal sewing, when the seam 501 of the fabric hem 5 enters the field of view 20101 of the industrial camera 201, the industrial camera 201 collects the seam image data of the fabric hem 5 in real time and transmits it to the processor for processing to obtain the seam position of the fabric hem 5 and compares it with the position of the needle of the hem machine to determine in real time whether the needle 4 is on the straight line of the seam 501 of the fabric hem 5.

[0052] S4. When the processor determines that the needle 4 is outside the straight line of the seam 501 of the fabric hem 5, the processor sends a correction signal to the controller. The controller controls the correction motor 103 to adjust the conveying position of the fabric hem 5, and thus adjust the seam position of the fabric hem 5.

[0053] During the first trial stitch, the actual feed stitch distance T3 can be obtained through a vision sensor. The absolute difference between the obtained actual feed stitch distance T3 and the determined auxiliary feed stitch distance T2 of the correction conveyor wheel is used as the first adjustment amount Δt1 of the machine head feed stitch distance T1. In this way, during the second trial stitch, the machine head feed stitch distance T1 can be precisely adjusted, and the actual feed stitch distance T3 can be precisely adjusted accordingly. The first adjustment value T of the actual feed stitch distance can be obtained through the vision sensor. 3-1 By comparing the obtained actual feed needle pitch first adjustment value T 3-1 Given the already determined auxiliary feeding pin pitch T2 of the correction conveyor wheel, if the actual feeding pin pitch first adjustment value T is determined... 3-1 If the absolute difference between the feed needle pitch T2 and the auxiliary feed needle pitch T2 of the correction conveyor wheel is less than the set threshold △T, then the first adjustment value T of the actual feed needle pitch is... 3-1 The feed needle pitch T2 of the guide wheel has been matched with the already determined auxiliary feed needle pitch of the machine head. Accordingly, the first adjustment value T of the feed needle pitch of the machine head has been adjusted. 1-1 The feed needle pitch T2 of the guide wheel has been matched with the actual feed needle pitch first adjustment value T. 3-1 It can quickly match the determined auxiliary feeding needle pitch T2 of the correction conveyor wheel, and the first adjustment value T of the head feeding needle pitch. 1-1 It can also be quickly matched with the determined auxiliary feeding pin pitch T2 of the correction conveyor wheel, so as to reduce the time for changeover and debugging. And because the actual feeding pin pitch first adjustment value T 3-1 The first adjustment value T of the feed needle pitch at the machine head 1-1 All of these are matched with the auxiliary feeding stitch distance T2 of the correction conveyor wheel, which ensures the stability of feeding during the subsequent formal sewing process. The stitch position of the fabric hem 5 is not prone to deviation, ensuring the re-stitching effect. During the formal sewing process, by directly and in real-time detecting the stitch position of the fabric hem 5 and directly controlling the re-stitching with the needle 4 as the reference, the technical defects of the prior art, which exist, are that the theoretical stitch position of the fabric hem 5 indirectly calculated by the photoelectric sensor 11 through the fabric hem edge 502 due to the hollow arching of the upper and lower layers of the fabric hem 5 does not match the actual stitch position of the fabric hem 5, and the re-stitching failure is caused by the correction control based on the incorrect stitch position information. This can effectively improve the overall re-stitching rate of the same fabric hem 5, thereby ensuring the sewing quality and production efficiency of the fabric hem 5.

[0054] Step S2 further includes: the controller determining the first adjustment value T of the actual feeding needle distance. 3-1 If the absolute difference between the actual feeding needle distance T2 and the auxiliary feeding needle distance T2 of the correction conveyor wheel is less than the set threshold △T, then adjust the actual feeding needle distance to the first adjustment value T. 3-1 K times the absolute difference between the feed needle pitch T2 of the correction conveyor wheel and the feed needle pitch of the machine head is used as the first adjustment value T of the feed needle pitch. 1-1 The second adjustment amount Δt2;

[0055] Step S23 is included between steps S2 and S3: When performing the third trial sewing on the hem 5 of the changed fabric, the controller first sends a corresponding action command to the feed dog drive source according to the second adjustment amount △t2. The feed dog drive source drives the feed dog to perform the corresponding action to adjust the first adjustment value T of the machine head feed stitch distance. 1-1 Adjust to T 1-1 ±△t2 is used as the second adjustment value T for the feed needle distance at the machine head. 1-2 Then, the industrial camera 201 acquires the seam image data of the fabric hem 5 and transmits it to the processor for processing to obtain the actual feed stitch distance second adjustment value T. 3-2 The data is then sent to the controller, which determines the actual feed needle pitch second adjustment value T. 3-2 When the absolute difference between the feed needle distance T2 of the correction conveyor wheel and the feed needle distance T2 is less than the set threshold △T, the feed adjustment of the fabric hem 5 is completed.

[0056] During the second trial stitch, the actual feed stitch distance adjustment value T can be obtained through the vision sensor. 3-1 If the actual feed needle pitch first adjustment value T is determined 3-1 If the absolute difference between the actual feeding needle pitch T2 and the auxiliary feeding needle pitch T2 of the correction conveyor wheel is greater than the set threshold △T, then the first adjustment value T of the actual feeding needle pitch will be adjusted. 3-1 K times the absolute difference between the feed needle pitch T2 and the determined auxiliary feed needle pitch of the correction conveyor wheel is used as the first adjustment value T for the feed needle pitch of the machine head. 1-1 The second adjustment amount △t2 allows for adjustments to the first adjustment value T of the feed stitch distance during the third trial stitch. 1-1 Precise adjustments are made, and the actual feed needle distance is adjusted to the first value T. 3-1 The first adjustment value T of the feed needle pitch along with the machine head 1-1 The precise adjustment can be achieved accordingly, wherein the actual feeding needle pitch second adjustment value T can be obtained through a vision sensor. 3-2 By comparing the obtained actual feed needle pitch second adjustment value T 3-2 Based on the determined auxiliary feeding pin pitch T2 of the correction conveyor wheel, determine the second adjustment value T of the actual feeding pin pitch. 3-2If the absolute difference between the feed needle pitch T2 and the auxiliary feed needle pitch T2 of the correction conveyor wheel is less than the set threshold △T, then the actual feed needle pitch second adjustment value T is... 3-2 The feed needle pitch T2 of the guide wheel has been matched with the already determined auxiliary feed needle pitch of the machine head. Accordingly, the second adjustment value T of the feed needle pitch of the machine head has been adjusted. 1-2 The feed needle pitch T2 of the guide wheel has also been matched, therefore the actual feed needle pitch second adjustment value T 3-2 It can quickly match the determined auxiliary feeding needle pitch T2 of the correction conveyor wheel, and the second adjustment value T of the head feeding needle pitch. 1-2 It can also be quickly matched with the already determined auxiliary feeding pin pitch T2 of the correction conveyor wheel, which can reduce the time for model change and debugging.

[0057] The process also includes step S5: the processor determines in real time whether the needle 4 is on the straight line of the seam 501 of the fabric hem 5. When the processor determines that the needle 4 is on the straight line of the seam 501 of the fabric hem 5, the processor sends a stop correction signal to the controller, and the controller controls the correction motor 103 to stop operating.

[0058] In one embodiment, the spin-correcting conveyor wheel 101, industrial camera 201, and light source 202 are arranged close to the needle 4, and the signal output terminal of the spin-correcting conveyor wheel 101 controller is also connected to the needle drive source of the lowering machine.

[0059] Step S23-2 is included between steps S23-1 and S3: Before formal sewing, the fabric hem 5 is conveyed between the correction conveyor wheel 101 and the feed wheel 8. The correction conveyor wheel 101 industrial camera 201 collects image data including the needle 4 and the fabric hem bob 503 and transmits it to the processor. When the correction conveyor wheel 101 processor receives image data that the fabric hem bob 503 is below the needle 4, the correction conveyor wheel 101 processor sends a start sewing signal to the controller. The correction conveyor wheel 101 controller controls the needle drive source to move, and the correction conveyor wheel 101 needle drive source drives the needle 4 to start sewing.

[0060] In this way, the visual sensor can accurately determine when the hemline 503 of the fabric is below the needle 4, ensuring the accuracy of the sewing timing.

[0061] In one embodiment, in step S2: the controller determines the actual feeding needle pitch first adjustment value T. 3-1 If the absolute difference between the feed needle pitch T2 and the auxiliary feed needle pitch T2 of the correction conveyor wheel is less than the set threshold △T, then calculate the first adjustment value T of the actual feed needle pitch. 3-1 The absolute difference N between the first adjustment amount Δt1 and the actual feeding needle distance T3 is used as the linear proportional coefficient K, and the ratio between the first adjustment amount Δt1 and the absolute difference N is used as the first adjustment value T of the actual feeding needle distance. 3-1K times the absolute difference between the feed needle pitch T2 of the correction conveyor wheel and the feed needle pitch of the machine head is used as the first adjustment value T of the feed needle pitch. 1-1 The second adjustment amount △t2.

[0062] In one preferred embodiment, in step S1: if T1 < T2, then T3 < T2, and T3 > T1, where Δt1 = T2 - T3;

[0063] In step S2: Adjust the feed needle distance T1 of the machine head to T1 + Δt1 = T 1-1 Where T3 < T 3-1 T 3-1 <T2, N=T 3-1 -T3, K=(T2-T3) / N, △t2=(T2-T 3-1 )×K;

[0064] In step S23: Adjust the first value T of the feed needle pitch of the machine head. 1-1 Adjust to T 1-1 +△t2=T 1-2 T 3-1 <T 3-2 T2-T 3-2 <△T.

[0065] The fabric hem feeding adjustment in this embodiment is shown in Table 1.

[0066] Table 1

[0067] Second trial stitching <![CDATA[T1+(T2-T3)=T 1-1 ]]> <![CDATA[T2]]> <![CDATA[T3+N=T 3-1 ]]> <![CDATA[When T1 is increased, the adjustment amount is the difference between T2 and T3, and the T obtained by the visual sensor 3-1 will also increase relative to T3, with a change amount of N, where T 3-1 <T2]]> Third trial stitch <![CDATA[T 1-1 +(T2-T 3-1 )×K=T 1-2 ]]> <![CDATA[T2]]> <![CDATA[T 3-1 +M=T 3-2 ]]> <![CDATA[T1 continues to increase, with the adjustment amount being K times the difference between T2 and T 3-1 , wherein the linear proportional coefficient K is determined based on the relevant data of the first trial sewing and the second trial sewing, where K=(T2-T3) / N, and then T obtained by the visual sensor 3-2 relative to T 3-1 will also increase, with a change amount of M, where T2-T 3-2 <△T]]>

[0068] The feeding adjustment of the fabric hem is shown again through the specific embodiments in Table 2.

[0069] Table 2

[0070] Second trial stitching <![CDATA[T1+(T2-T3)=T 1-1 Then T1+2=T 1-1 ]]> <![CDATA[T2=5]]> <![CDATA[T3+N=T 3-1 Then 3 + 1 = 4 <![CDATA[When T1 is increased, the adjustment amount is the difference between T2 and T3, and then T obtained by the vision sensor 3-1 will also increase relative to T3, the change amount N is 1, where T2-T 3-1 =5-4]]> Third trial stitch <![CDATA[T 1-1 +(T2-T 3-1 )×K=T 1-2 Then (T1+2)+(5-4)×2=T 1-2 ]]> <![CDATA[T2=5]]> <![CDATA[T 3-1 +M=T 3-2 Then 4 + 1 = 5 <![CDATA[T1 continues to be increased, with the adjustment amount being K times the difference between T2 and T 3-1 where the linear proportional coefficient K is determined based on the relevant data of the first trial sewing and the second trial sewing, where K=(T2-T3) / N, thus K=(5-3) / 1=2, and then T obtained by the visual sensor 3-2 relative to T 3-1 will also increase, with a change amount M of 1, where T2-T 3-2 =0]]>

[0071] In another preferred embodiment, in step S1: if T1 > T2, then T3 > T2 and T3 < T1, where Δt1 = T3 - T2;

[0072] In step S2: Adjust the feed needle distance T1 of the machine head to T1 - Δt1 = T 1-1 Where T3 > T 3-1 T 3-1 >T2, N=T3-T 3-1 K=(T3-T2) / N, △t2=(T 3-1 -T2)×K;

[0073] In step S23: Adjust the first value T of the feed needle pitch of the machine head. 1-1 Adjust to T 1-1-△t2=T 1-2 T 3-1 >T 3-2 T 3-2 -T2<△T.

[0074] In one embodiment, in step S2: the controller first sends a corresponding action command to the feed tooth drive source according to the first adjustment amount △t1 to adjust the feed tooth pitch T1 of the machine head to T1±△t1. Specifically, the controller first sends a corresponding action command to the feed tooth drive source according to the first adjustment amount △t1, and the feed tooth drive source drives the feed tooth to perform corresponding actions to adjust the horizontal feed amount of the feed tooth, thereby adjusting the feed tooth pitch T1 of the machine head to T1±△t1.

[0075] In one embodiment, step S4 specifically involves: when the processor determines that the needle 4 is located between the straight line of the stitch 501 of the fabric hem 5 and the edge 502 of the fabric hem, the processor sends a correction signal to the controller. The controller controls the correction motor 103 to move, thereby driving each correction belt 104 to move along the axis of the correction conveyor wheel 101 towards the direction close to the edge 502 of the fabric hem. By utilizing the static friction between each correction belt 104 and the fabric hem 5, the fabric hem 5 is moved towards the direction close to the edge 502 of the fabric hem, thereby adjusting the conveying position of the fabric hem 5 and thus adjusting the stitch position of the fabric hem 5.

[0076] In one embodiment, step S4 specifically involves: when the processor determines that the straight line of the seam 501 of the fabric hem 5 is located between the needle 4 and the edge 502 of the fabric hem, the processor sends a correction signal to the controller. The controller controls the correction motor 103 to move, thereby driving each correction belt 104 to move away from the edge 502 of the fabric hem along the axis of the correction conveyor wheel 101. By utilizing the static friction between each correction belt 104 and the fabric hem 5, the fabric hem 5 is moved away from the edge 502 of the fabric hem to adjust the conveying position of the fabric hem 5, thereby adjusting the seam position of the fabric hem 5.

[0077] In one embodiment, the signal input terminal of the controller is also communicatively connected to the position sensor on the transmission motor 102.

[0078] In step S1, the auxiliary feeding distance T2 of the correction conveyor wheel is calculated by the controller based on the rotation signal of the conveyor motor 102 sent by the position sensor on the conveyor motor 102.

[0079] In one embodiment, the industrial camera 201 and the light source 202 are arranged coaxially, and the light source 202 is located between the needle plate 3 of the lower swing machine and the industrial camera 201. Figure 7 and Figure 8 .

[0080] In one embodiment, the industrial camera 201 and the light source 202 are mounted on the head 6 of the swing machine via a bracket 7, see... Figures 4-8 .

[0081] In summary, this invention, through the actual feeding pin pitch T3 obtained by the vision sensor and the determined auxiliary feeding pin pitch T2 of the correction conveyor wheel, can precisely adjust the feeding pin pitch T1 of the machine head, thereby ensuring that the first adjustment value T of the actual feeding pin pitch is achieved. 3-1 The feed stitch length T2 is quickly matched with the correction conveyor wheel, reducing the time for changing styles and debugging; and by directly and in real time detecting the stitch position of the fabric hem 5 and directly controlling the re-thread with the machine needle 4 as the reference, the overall re-thread rate of the fabric hem 5 of the same fabric can be effectively improved, thereby ensuring the sewing quality and production efficiency of the fabric hem 5.

[0082] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A visual adjustment control method for a hemless machine, comprising using a visual adjustment control system for the hemless machine for adjustment control, characterized in that: The visual adjustment control system of the hem machine includes a visual sensor and a controller. The visual sensor includes an industrial camera (201), a light source (202), and a processor. The industrial camera (201) and the light source (202) are located above the seam (501) of the hem of the fabric (5). The industrial camera (201) is connected to the signal input terminal of the processor. The signal output terminal of the processor is connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the feed tooth drive source and the correction motor (103) of the hem machine. The visual adjustment and control method for the heel counter includes the following steps: S1. When the fabric hem (5) after the change of style is first test sewn, the industrial camera (201) collects the sewing image data of the fabric hem (5) and transmits it to the processor for processing to obtain the actual feeding needle distance T3 and send it to the controller. The controller takes the absolute difference between the actual feeding needle distance T3 and the determined correction conveyor wheel auxiliary feeding needle distance T2 as the first adjustment amount △t1 of the machine head feeding needle distance T1. S2. During the second trial stitch, the controller first sends an action command to the feed tooth drive source according to the first adjustment amount △t1, adjusting the feed needle distance T1 of the machine head to T1±△t1, which is then used as the first adjustment value T of the feed needle distance of the machine head. 1-1 The industrial camera (201) then acquires stitch image data and transmits it to the processor for processing to obtain the first adjustment value T of the actual feed stitch distance. 3-1 And send it to the controller, which determines the actual feeding needle pitch first adjustment value T. 3-1 If the absolute difference between the feed needle distance T2 of the correction conveyor wheel and the feed needle distance T2 is less than the set threshold △T, then the feed adjustment of the fabric hem (5) is completed. S3. During the formal sewing process, the industrial camera (201) collects sewing line image data in real time and transmits it to the processor for processing to obtain the sewing line position. It then compares the sewing line position with the needle position of the hem machine to determine in real time whether the needle (4) is on the straight line of the sewing line (501). S4. When it is determined that the needle (4) is outside the straight line of the sewing thread (501), the processor sends a correction signal to the controller, and the controller controls the correction motor (103) to adjust the conveying position of the fabric hem (5), thereby adjusting the position of the sewing thread.

2. The visual adjustment and control method for a swing-down machine according to claim 1, characterized in that, Step S2 further includes: the controller determining the actual feeding needle distance first adjustment value T. 3-1 If the absolute difference between the actual feeding needle distance T2 and the auxiliary feeding needle distance T2 of the correction conveyor wheel is less than the set threshold △T, then adjust the actual feeding needle distance to the first adjustment value T. 3-1 K times the absolute difference between the feed needle pitch T2 of the correction conveyor wheel and the feed needle pitch of the machine head is used as the first adjustment value T of the feed needle pitch. 1-1 The second adjustment amount Δt2; Between steps S2 and S3, there is also step S23-1: During the third trial stitch, the controller first sends a corresponding action command to the feed tooth drive source according to the second adjustment amount △t2. The feed tooth drive source drives the feed tooth to perform the corresponding action to adjust the first adjustment value T of the machine head feed needle pitch. 1-1 Adjust to T 1-1 ±△t2 is used as the second adjustment value T for the feed needle distance at the machine head. 1-2 Then, the industrial camera (201) acquires the seam image data of the fabric hem (5) and transmits it to the processor for processing to obtain the second adjustment value T of the actual feeding stitch distance. 3-2 The data is then sent to the controller, which determines the actual feed needle pitch second adjustment value T. 3-2 When the absolute difference between the feed needle distance T2 of the correction conveyor wheel and the feed needle distance T2 is less than the set threshold △T, the feed adjustment of the fabric hem (5) is completed.

3. The visual adjustment and control method for a swing-down machine according to claim 2, characterized in that, It also includes step S5: the processor determines in real time whether the needle (4) is on the straight line of the seam (501) of the fabric hem (5). When the processor determines that the needle (4) is on the straight line of the seam (501) of the fabric hem (5), the processor sends a stop correction signal to the controller, and the controller controls the correction motor (103) to stop operating.

4. The visual adjustment and control method for a hemless machine according to claim 3, characterized in that: The industrial camera (201) and light source (202) are arranged close to the needle (4), and the signal output terminal of the controller is also connected to the needle drive source of the hem machine. Step S23-2 is also included between step S23-1 and step S3: Before formal sewing, the fabric hem (5) is conveyed between the correction conveyor wheel (101) and the feed wheel (8). The industrial camera (201) collects image data including the needle (4) and the fabric hem bob (503) and transmits it to the processor. When the processor receives image data that the fabric hem bob (503) is below the needle (4), the processor sends a start sewing signal to the controller. The controller controls the needle drive source to move, and the needle drive source drives the needle (4) to start sewing.

5. The visual adjustment and control method for a hemless machine according to claim 3, characterized in that, In step S2: the controller determines the actual feeding needle distance first adjustment value T. 3-1 If the absolute difference between the feed needle pitch T2 and the auxiliary feed needle pitch T2 of the correction conveyor wheel is less than the set threshold △T, then calculate the first adjustment value T of the actual feed needle pitch. 3-1 The absolute difference N between the first adjustment amount Δt1 and the actual feeding needle distance T3 is used as the linear proportional coefficient K, and the ratio between the first adjustment amount Δt1 and the absolute difference N is used as the first adjustment value T of the actual feeding needle distance. 3-1 K times the absolute difference between the feed needle pitch T2 of the correction conveyor wheel and the feed needle pitch of the machine head is used as the first adjustment value T of the feed needle pitch. 1-1 The second adjustment amount △t2.

6. The visual adjustment and control method for a hemless machine according to claim 5, characterized in that, In step S1: If T1 < T2, then T3 < T2 and T3 > T1, where Δt1 = T2 - T3; In step S2: Adjust the feed needle distance T1 of the machine head to T1 + Δt1 = T 1-1 Where T3 < T 3-1 T 3-1 <T2, N=T 3-1 -T3, K=(T2-T3) / N, △t2=(T2-T 3-1 )×K; In step S23: Adjust the first value T of the feed needle pitch of the machine head. 1-1 Adjust to T 1-1 +△t2=T 1-2 T 3-1 <T 3-2 T2-T 3-2 <△T.

7. The visual adjustment and control method for a hemless machine according to claim 5, characterized in that, In step S1: If T1 > T2, then T3 > T2 and T3 < T1, where Δt1 = T3 - T2; In step S2: Adjust the feed needle distance T1 of the machine head to T1 - Δt1 = T 1-1 Where T3 > T 3-1 T 3-1 >T2, N=T3-T 3-1 K=(T3-T2) / N, △t2=(T 3-1 -T2)×K; In step S23: Adjust the first value T of the feed needle pitch of the machine head. 1-1 Adjust to T 1-1 -△t2=T 1-2 T 3-1 >T 3-2 T 3-2 -T2<△T.

8. The visual adjustment and control method for a hemless machine according to claim 3, characterized in that, In step S2: The controller first sends an action command to the feed tooth drive source according to the first adjustment amount △t1 to adjust the feed tooth pitch T1 of the machine head to T1±△t1. Specifically, the controller first sends a corresponding action command to the feed tooth drive source according to the first adjustment amount △t1, and the feed tooth drive source drives the feed tooth to perform corresponding actions to adjust the horizontal feed amount of the feed tooth, thereby adjusting the feed tooth pitch T1 of the machine head to T1±△t1.

9. The visual adjustment and control method for a hemless machine according to claim 3, characterized in that, Step S4 is as follows: When the processor determines that the needle (4) is located between the straight line of the sewing line (501) of the fabric hem (5) and the edge of the fabric hem (502), the processor sends a correction signal to the controller. The controller controls the correction motor (103) to drive each correction belt (104) to move along the axis of the correction conveyor wheel (101) towards the direction close to the edge of the fabric hem (502). By using the static friction between each correction belt (104) and the fabric hem (5), the fabric hem (5) moves towards the direction close to the edge of the fabric hem (502) to adjust the conveying position of the fabric hem (5) and thus adjust the sewing line position of the fabric hem (5).

10. The visual adjustment and control method for a hemless machine according to claim 3, characterized in that, Step S4 is as follows: When the processor determines that the straight line of the seam (501) of the fabric hem (5) is located between the needle (4) and the edge (502) of the fabric hem, the processor sends a correction signal to the controller. The controller controls the correction motor (103) to drive each correction belt (104) to move away from the edge (502) of the fabric hem along the axis of the correction conveyor wheel (101). By using the static friction between each correction belt (104) and the fabric hem (5), the fabric hem (5) moves away from the edge (502) of the fabric hem to adjust the conveying position of the fabric hem (5) and thus adjust the seam position of the fabric hem (5).

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