A hem machine heavy line visual control method

Abstract

The application discloses a hem thread visual control method, industrial cameras collect the thread image data of the hem of cloth in real time, transmit the data to the processor and process the data through the processor to obtain the thread position and compare the thread position with the needle position to determine whether the needle is on the straight line of the thread in real time; when the processor determines that the needle is out of the straight line of the thread, the processor sends a correction signal to the controller, the controller controls the correction motor to move along the axial direction of the correction transmission wheel to drive each correction belt to move along the axial direction of the correction transmission wheel, adjust the conveying position of the hem of cloth and further adjust the thread position; the processor determines whether the needle is on the straight line of the thread in real time, when the processor determines that the needle is on the straight line of the thread, the processor sends a stop correction signal to the controller, and the controller controls the correction motor to stop moving. The thread position of the hem of cloth is directly and timely detected, the needle is directly controlled as the reference, and the overall thread rate of the hem of the same fabric can be effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of hemless machine technology, specifically relating to a visual control method for hemless machine weight lines. 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 must be controlled with high precision.

[0003] Currently, as shown in the attached diagram Figures 1-3 As shown, commercially available fully automatic hem correction machines mainly use photoelectric sensors 11 in conjunction with correction components to complete the correction function of the fabric hem 5, thereby achieving control of the weight line. The correction component includes a correction transmission wheel 101, on which multiple sets of correction belts are installed. 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, sequentially wound between the winding gear, support wheel, and winding wheel. The transmission shaft 105 fixed at one end of the correction transmission wheel 101... The output shaft of the synchronous belt is connected to the transmission motor 102. A correction shaft is inserted inside the transmission shaft 105 and is rotatably connected to the transmission shaft 105. One end of the correction shaft is connected to the output shaft of the correction motor 103. The other end of the correction shaft extends into the correction transmission wheel 101 and is fitted with a worm gear. The worm wheel of each correction belt group meshes with the worm gear and the corresponding wound gear. The fabric hem 5 is wound between the fabric feeding wheel 8 and the correction transmission wheel 101. The photoelectric sensor 11 is set on one side of the correction transmission wheel 101. The light emitted by the photoelectric sensor 11 illuminates the vicinity of one end of the correction transmission wheel 101. The intersection point between the light path 1101 formed by the light emitted by the photoelectric sensor 11 and the correction transmission wheel 101 is defined as the control point.

[0004] In the aforementioned prior art, the specific working principle of correcting the fabric hem 5 by cooperating with the photoelectric sensor 11 and the correction component is as follows: After the fabric hem 5 is folded, the edge 502 of the fabric hem at the correction conveyor wheel 101 will return to the control point under the correction action of multiple correction belts 104. The photoelectric sensor 11 detects the edge 502 of the fabric hem at the correction conveyor wheel 101 at regular intervals and transmits the detection signal to the controller. When the edge 502 of the fabric hem at the correction conveyor wheel 101 is detected... When 502 leaves or exceeds the control point, the controller controls the correction motor 103 to drive each correction belt 104 to move axially along the correction transmission wheel 101. Using the static friction between each correction belt 104 and the fabric hem 5, the edge 502 of the fabric hem at the correction transmission wheel 101 is kept near the control point. At the same time, under the transmission action of the correction transmission 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.

[0005] 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. Summary of the Invention

[0006] In view of the above-mentioned deficiencies of the prior art, the present invention provides a visual control method for hem re-stitching, which can effectively improve the overall re-stitching 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-stitching with the needle as a reference.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] A visual control method for hem-weaving machine is disclosed, which employs a hem-weaving machine visual control system. The visual 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 positioned above the seam of the fabric hem. 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, and the signal output terminal of the controller is communicatively connected to the correction motor.

[0009] The visual control method for the heel counterline includes the following steps:

[0010] S1. When the seam of the fabric hem enters the field of view of the industrial camera, the industrial camera collects the seam image data of the fabric hem in real time and transmits it to the processor. The processor processes the collected image data 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.

[0011] S2. When the processor determines that the needle is outside the straight line of the sewing line of the fabric hem, the processor sends a correction signal to the controller. The controller controls the correction motor to move, so as to drive each correction belt to move along the axis of the correction conveyor wheel. By using the static friction between each correction belt and the fabric hem, the conveying position of the fabric hem is adjusted, thereby adjusting the sewing line position of the fabric hem.

[0012] S3. The processor determines in real time whether the needle is on the straight line of the seam at the bottom of the fabric. When the processor determines that the needle is on the straight line of the seam at the bottom of the fabric, the processor sends a stop correction signal to the controller, and the controller controls the correction motor to stop operating.

[0013] Furthermore, step S2 also includes: when the processor determines that the needle is on the straight line of the seam at the hem of the fabric, the processor does not send a signal to the controller.

[0014] Further, step S2 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.

[0015] Further, step S2 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, and thus adjust the position of the fabric hem's stitch.

[0016] Furthermore, the industrial camera and the light source are coaxially arranged near the needle, and the light source is located between the needle plate of the lowering machine and the industrial camera.

[0017] Furthermore, the industrial camera and light source are mounted on the head of the swing machine via a mounting assembly.

[0018] Furthermore, the mounting assembly includes a sliding bracket, a fixed bracket, and a connecting bracket. The industrial camera and light source are fixed on one side of the sliding bracket. The other side of the sliding bracket is provided with multiple vertical grooves. The fixed bracket is fixed to the machine head via the connecting bracket. The fixed bracket has multiple vertical sliders on the side opposite to the other side of the sliding bracket, with the number of sliders equal to the number of grooves. Each slider cooperates with a corresponding groove. The sliding bracket slides between a first position and a second position relative to the corresponding sliders via each groove. The horizontal height of the first position is higher than that of the second position. When the sliding bracket slides to the first or second position, the sliding bracket and the fixed bracket are locked together by a locking device.

[0019] Furthermore, when the sliding bracket slides to the first position, the industrial camera adopts a wide field of view. Step S1 specifically involves: when the seam of the fabric hem enters the field of view of the industrial camera, the industrial camera collects the seam image data of the fabric hem in real time and transmits it to the processor. The processor processes the collected image data to obtain the seam position of the fabric hem. The industrial camera also collects the needle image data of the hem machine and transmits it to the processor. The processor processes the collected image data to obtain the needle position. The processor compares the seam position of the fabric hem with the needle position to determine in real time whether the needle is on the straight line of the seam of the fabric hem.

[0020] Furthermore, when the sliding bracket slides to the second position, the industrial camera adopts a small field of view. Step S1 specifically involves: when the seam of the fabric hem enters the field of view of the industrial camera, the industrial camera collects the seam image data of the fabric hem in real time and transmits it to the processor. The processor processes the collected image data to obtain the seam position of the fabric hem and compares it with the hem machine needle position pre-stored in the processor to determine in real time whether the machine needle is on the straight line of the fabric hem seam.

[0021] Furthermore, multiple vertical guide rods are fixed on the top surface of the base of the sliding bracket, and guide holes are provided on the fixed bracket at positions corresponding to each guide rod. Each guide rod is inserted into the corresponding guide hole and can slide relative to the guide hole. The locking component includes multiple locking rods, each of which passes through the connecting bracket, the fixed bracket and the sliding bracket in sequence to achieve locking between the sliding bracket and the fixed bracket.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The visual control method for hem rewinding of the fabric hem of the present invention includes the following steps: S1. When the seam of the fabric hem enters the field of view of the industrial camera, the industrial camera acquires the seam image data of the fabric hem in real time and transmits it to the processor. The processor processes the acquired image data to obtain the seam position of the fabric hem and compares it with the position of the needle of the hem rewinding machine to determine in real time whether the needle is on the straight line of the fabric hem seam; S2. When the processor determines that the needle is outside the straight line of the fabric hem seam, the processor sends a correction signal to the controller. The controller controls the correction motor to move to drive each correction belt to move axially along the correction conveyor wheel. The static friction between each correction belt and the fabric hem is used to adjust the conveying position of the fabric hem, thereby adjusting the seam position of the fabric hem; S3. The processor determines in real time whether the needle is on the straight line of the fabric hem seam. When the processor determines that the needle is on the straight line of the fabric hem seam, the processor sends a stop correction signal to the controller. The controller controls the correction motor to stop moving. In this way, by directly and in real-time detecting the seam position of the fabric hem during the sewing process, and directly controlling the re-stitching based on the machine needle, the technical defects of the prior art, which exist because the theoretical seam position of the fabric hem indirectly calculated by the photoelectric sensor detects the edge of the fabric hem due to the hollow arching of the upper and lower layers of the fabric hem, do not match the actual seam position of the fabric hem. The re-stitching failure caused by the incorrect seam position information can be avoided. In this way, the overall re-stitching rate of the fabric hem of the same material can be effectively improved, thereby ensuring the sewing quality and production efficiency of the fabric hem. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of a fully automatic swing-down machine in the background technology;

[0025] Figure 2 for Figure 1 A partially enlarged structural diagram;

[0026] Figure 3 for Figure 1 A magnified schematic diagram of the structure behind the hidden fabric hem;

[0027] Figure 4 This is a three-dimensional structural diagram of a swing machine including the swing machine vision control system of the present invention;

[0028] Figure 5 for Figure 4 A partially enlarged structural diagram;

[0029] Figure 6 for Figure 4 A magnified schematic diagram of the structure behind the hidden fabric hem;

[0030] Figure 7 for Figure 4 A schematic diagram of the three-dimensional structure from another direction;

[0031] Figure 8 for Figure 7 A partially enlarged structural diagram;

[0032] Figure 9 This is a flowchart of the visual control method for the lower swing machine's weight line in this invention.

[0033] The following are the annotations 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, needle; 5, fabric hem; 501, sewing thread; 502, fabric hem edge; 6, machine head; 701, sliding bracket; 70101, chute; 70102, guide rod; 702, fixed bracket; 70201, slider; 703, connecting bracket; 704, locking rod; 8, feed wheel; 9, motor base; 10, platform; 11, photoelectric sensor; 1101, optical path. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0038] A vision-based control method for hemless machine rewinding, employing a vision control system for the hemless machine, such as... Figures 4-8 As 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 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 of the fabric. 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 correction motor 103.

[0039] like Figure 9 As shown, the visual control method for the hemline of a lower hem machine includes the following steps:

[0040] S1. 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. The processor processes the collected image data 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.

[0041] S2. 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 drive each correction belt 104 to move along the axis of the correction conveyor wheel 101. The static friction between each correction belt 104 and the fabric hem 5 is used to adjust the conveying position of the fabric hem 5, thereby adjusting the seam position of the fabric hem 5.

[0042] S3. 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.

[0043] In this way, by directly and in real-time detecting the seam position of the fabric hem 5 during the sewing process, and directly controlling the re-stitching based on the needle 4, the technical defects of the prior art, which exist because the theoretical seam position of the fabric hem detected by the photoelectric sensor 502 does not match the actual seam position of the fabric hem due to the hollow arching of the upper and lower layers of the fabric hem 5, and the failure of re-stitching when correcting the deviation based on the incorrect seam position information, can be avoided. This can effectively improve the overall re-stitching rate of the same fabric hem, thereby ensuring the sewing quality and production efficiency of the fabric hem.

[0044] In one embodiment, step S2 further includes: when the processor determines that the needle 4 is on the straight line of the seam 501 of the fabric hem 5, the processor does not send a signal to the controller.

[0045] In one embodiment, step S2 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.

[0046] In one embodiment, step S2 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.

[0047] In one embodiment, the industrial camera 201 and the light source 202 are coaxially arranged near the needle 4, with the light source 202 positioned between the needle plate 3 of the hem-end machine and the industrial camera 201. The industrial camera 201 and the light source 202 are mounted on the head 6 of the hem-end machine via a mounting assembly. Figures 5-8 As shown, the mounting assembly includes a sliding bracket 701, a fixed bracket 702, and a connecting bracket 703. The industrial camera 201 and the light source 202 are fixed on one side of the sliding bracket 701. The other side of the sliding bracket 701 is provided with multiple vertical grooves 70101. The fixed bracket 702 is fixed to the machine head 6 through the connecting bracket 703. The fixed bracket 702 has multiple vertical sliders 70201 on the side opposite to the other side of the sliding bracket 701, and the number of sliders 70201 is equal to the number of grooves 70101. Each slider 70201 cooperates with the corresponding groove 70101. The sliding bracket 701 slides between the first position and the second position relative to the corresponding slider 70201 through each groove 70101. The horizontal height of the first position is higher than that of the second position. When the sliding bracket 701 slides to the first position or the second position, the sliding bracket 701 and the fixed bracket 702 are locked together by a locking member.

[0048] In this process, the sliding bracket 701 slides to the first position, and the industrial camera 201 adopts a wide field of view. Step S1 is as follows: 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. The processor processes the collected image data to obtain the seam position of the fabric hem 5. The industrial camera 201 also collects the image data of the hem machine needle and transmits it to the processor. The processor processes the collected image data to obtain the needle position. The processor compares the seam position of the fabric hem 5 with the needle position and determines in real time whether the needle 4 is on the straight line where the seam 501 of the fabric hem 5 is located.

[0049] For the hem 5 of some fabrics, the seam 501 of the hem 5 is easy to identify. By sliding the sliding bracket 701 to the first position, the industrial camera 201 is raised to adopt a wide field of view. In this way, the industrial camera 201 can collect image data over a wider range and can directly collect image data of the needle 4 and transmit it to the processor. The processor processes the collected image data to obtain the position of the needle, thus making the hem of the fabric more stable.

[0050] In this process, the sliding bracket 701 slides to the second position, and the industrial camera 201 adopts a small field of view. Specifically, step S1 is as follows: 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. The processor processes the collected image data to obtain the seam position of the fabric hem 5 and compares it with the position of the hem machine needle stored in the processor in advance to determine in real time whether the machine needle 4 is on the straight line where the seam 501 of the fabric hem 5 is located.

[0051] For some fabric hem 5, the seam 501 of the fabric hem 5 is not easy to identify. By sliding the sliding bracket 701 to the second position, the industrial camera 201 is lowered and the industrial camera 201 adopts a small field of view. In this way, the industrial camera 201 can more clearly collect the seam image data of the fabric hem 5, ensuring the accuracy of the obtained fabric hem seam position.

[0052] Among them, multiple vertical guide rods 70102 are fixed on the top surface of the base of the sliding bracket 701, see Figure 5 , Figure 6 and Figure 8 The fixed bracket 702 has guide holes at positions corresponding to each guide rod 70102. Each guide rod 70102 is inserted into the corresponding guide hole and can slide relative to the guide hole; for example... Figure 5 and Figure 6 As shown, the locking component includes multiple locking rods 704, each of which passes through the connecting bracket 703, the fixed bracket 702 and the sliding bracket 701 in sequence to achieve locking between the sliding bracket 701 and the fixed bracket 702.

[0053] In summary, this invention, by directly and in real-time detecting the seam position of the fabric hem during the sewing process and directly controlling the re-threading with the machine needle 4 as a reference, can effectively improve the overall re-threading rate of the same fabric hem, thereby ensuring the sewing quality and production efficiency of the fabric hem.

[0054] 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 control method for the hemline of a swing machine, comprising a vision control system for the swing machine, characterized in that: The vision control system of the hem machine 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 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 correction motor (103). The visual control method for the heel counterline includes the following steps: S1. The industrial camera (201) collects the seam image data of the fabric hem (5) in real time and transmits it to the processor. The processor processes the collected image data 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). S2. 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 drive each correction belt (104) to move along the axis of the correction conveyor wheel (101), adjust the conveying position of the fabric hem (5), and then adjust the seam position of the fabric hem (5). S3. 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.

2. The visual control method for the hemline of a lower hem machine according to claim 1, characterized in that, Step S2 further includes: when the processor determines that the needle (4) is on the straight line of the seam (501) of the fabric hem (5), the processor does not send a signal to the controller.

3. The visual control method for the hemline of a lower hem machine according to claim 1, characterized in that, Step S2 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).

4. The visual control method for the hemline of a lower hem machine according to claim 1, characterized in that, Step S2 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).

5. The visual control method for the hemline of a lower hem machine according to claim 1, characterized in that: The industrial camera (201) and the light source (202) are coaxially arranged near the needle (4), and the light source (202) is located between the needle plate (3) of the lower helix machine and the industrial camera (201).

6. The visual control method for the hemline of a machine according to claim 5, characterized in that: The industrial camera (201) and light source (202) are mounted on the head (6) of the swing machine via a mounting assembly.

7. The visual control method for the hemline of a machine according to claim 6, characterized in that: The mounting assembly includes a sliding bracket (701), a fixed bracket (702), and a connecting bracket (703). The industrial camera (201) and the light source (202) are fixed on one side of the sliding bracket (701). The other side of the sliding bracket (701) is provided with multiple vertical sliding grooves (70101). The fixed bracket (702) is fixed to the machine head (6) through the connecting bracket (703). The fixed bracket (702) has multiple vertical sliding grooves (70101) on the side opposite to the other side of the sliding bracket (701). The sliders (70201) have an equal number of grooves (70101), and each slider (70201) is matched with a corresponding groove (70101); the sliding bracket (701) slides relative to the corresponding slider (70201) through each groove (70101) between a first gear position and a second gear position. The horizontal height of the first gear position is higher than that of the second gear position. The sliding bracket (701) slides to the first gear position or the second gear position. The sliding bracket (701) and the fixed bracket (702) are locked together by a locking member.

8. The visual control method for the hemline of a lower hem machine according to claim 7, characterized in that: The sliding bracket (701) slides to the first position, and the industrial camera (201) adopts a wide field of view. Step S1 is as follows: 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. The processor processes the collected image data to obtain the seam position of the fabric hem (5). The industrial camera (201) also collects the needle image data of the hem machine and transmits it to the processor. The processor processes the collected image data to obtain the needle position. The processor compares the seam position of the fabric hem (5) with the needle position and determines in real time whether the needle (4) is on the straight line of the seam (501) of the fabric hem (5).

9. The visual control method for the hemline of a lower hem machine according to claim 7, characterized in that: The sliding bracket (701) slides to the second position, and the industrial camera (201) adopts a small field of view. Step S1 is as follows: 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. The processor processes the collected image data to obtain the seam position of the fabric hem (5) and compares it with the hem machine needle position stored in the processor in advance. It then determines in real time whether the machine needle (4) is on the straight line where the seam (501) of the fabric hem (5) is located.

10. The visual control method for the hemline of a machine according to claim 7, characterized in that: The sliding bracket (701) has a plurality of vertical guide rods (70102) fixed on the top surface of its base. The fixed bracket (702) has guide holes at positions corresponding to each guide rod (70102). Each guide rod (70102) is inserted into the corresponding guide hole and can slide relative to the guide hole. The locking component includes a plurality of locking rods (704). Each locking rod (704) passes through the connecting bracket (703), the fixed bracket (702) and the sliding bracket (701) in sequence to achieve locking between the sliding bracket (701) and the fixed bracket (702).

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