An automatic hemming device

Abstract

The utility model relates to sewing machine manufacturing technical field discloses an automatic overlock lower hem equipment. The equipment passes through the overlock machine of mesa support integrated trimming function, cooperates with the active right wheel component of deviation correction tow cloth round leather belt, the passive left wheel component adjusted interval by linear motion module, and the trimming fine adjustment component and light eye detection control system based on screw -nut mechanism, constructs the automation operation system of 'right wheel drive delivery - left wheel bracing adjustment - light eye cooperative deviation - trimming overlock integration'. The equipment breaks through the traditional process limitation, realizes 'trimming - overlock' process integration, solves the problem of process incompatibility, tension imbalance and big trimming error in the prior art through dynamic tension control and 0.1mm level trimming precision adjustment, can automatically adapt S - 6XL cloth, and the time of changing code is less than or equal to 3 seconds, and the production efficiency under the complex terrain and the multi -size flexible production capacity are improved significantly.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine manufacturing technology, specifically an automatic overlock sewing device for hems. Background Technology

[0002] Currently, in garment hem sewing processes, some customers or production scenarios have requested a "first overlock and then cover stitch" process. This involves first trimming and binding the fabric edges, and then using a cover stitch machine to sew the hem. However, existing technologies, including the applicant's previously disclosed patent CN110607611A, "A Garment Hem Circular Sewing Device," can only complete the "bending + cover stitch" process and cannot meet the "trimming-binding" operational requirements.

[0003] Furthermore, in existing technologies, both the left and right rotating wheels are driven by independent motors, with the two wheels rotating synchronously to maintain fabric tension during overlock stitching. However, overlock stitching requires constant fabric tension and avoids excessive stretching during edge trimming, resulting in wavy and distorted edges after trimming, which cannot guarantee trimming accuracy. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an automatic overlock sewing device for hems, the technical solution of which is as follows: An automatic overlock sewing machine, comprising A platform used to support the overall structure of the equipment; An overlock sewing machine, fixed on the table, integrates an edge-cutting function, and has a lower hem support plate coplanar with it fixed around its needle plate; The right wheel assembly includes a right wheel located on the fabric feeding side of the overlock sewing machine that can rotate actively. The upper edge of the right wheel is tangent to the upper surface of the lower hem support plate. Multiple rotatable correction drag belts are evenly distributed around the right wheel in the circumferential direction. The left wheel assembly includes a left wheel located on the fabric output side of the overlock sewing machine that can rotate actively. The upper edge of the left wheel is 9mm lower than the upper surface of the lower heel support plate. The left wheel is driven by the linear motion module to move left and right in the horizontal direction. The fabric pushing cylinder assembly includes a telescopic cylinder fixed between the overlock sewing machine and the right wheel assembly, with a stroke in the forward and backward direction. The drive end of the telescopic cylinder is connected to the vertical push plate, the lower end of the vertical push plate extends below the hem support plate, and a flat pressure plate is fixed on the vertical push plate. The gap between the flat pressure plate and the hem support plate is adapted to the thickness of the hem fabric.

[0005] Furthermore, it also includes a control system, which comprises a controller and an electrically connected drive module, the controller being electrically connected to the following components: The drive motor of the right wheel is used to control the active rotation speed of the right wheel; The drive motor of the corrective mop belt is used to adjust the front and rear position of the hem fabric. The drive motor of the linear motion module is used to adjust the distance between the left and right wheels according to the size of the hem fabric. The telescopic cylinder of the fabric pushing cylinder assembly is used to drive the flat pressure plate to perform forward and backward pushing actions. When the sewing process ends, the flat pressure plate pushes the fabric away from the sewing machine working area to prevent the fabric from being repeatedly sewn due to the continuous operation of the sewing mechanism. The fabric boning detection device is fixed to the right side of the right wheel and is used to detect the boning position of the hem fabric and feed it back to the controller to control the start and stop of the sewing machine.

[0006] Furthermore, the fabric rib detection device is an infrared photodetector, arranged along the right wheel axis.

[0007] Furthermore, it also includes an edge-cutting photoelectric detection device, comprising a micro motor fixed to the right side of the fabric-pushing cylinder assembly, the drive shaft of the micro motor being fixed to a lead screw, the lead screw being screwed to a nut, and the nut being fixed to an edge-cutting photoelectric sensor for detecting the edge offset of the fabric; when the detected offset exceeds 0.2mm, the controller drives the correction mop belt according to the following logic: if the fabric is in front, drive the correction mop belt to rotate backward; if the fabric is in back, drive the correction mop belt to rotate forward.

[0008] Furthermore, the cutting photoelectric sensor is adjusted for forward and backward displacement via a screw-nut mechanism with an adjustment accuracy of 0.1mm. The controller synchronously drives a micro motor to adjust the forward and backward position of the cutting photoelectric sensor based on the rib position signal from the fabric rib detection device, so that the edge of the fabric to be cut is always aligned with the photoelectric sensor, forming a "photoelectric sensor collaborative positioning" mechanism.

[0009] Furthermore, multiple silicone rings are embedded in the left wheel, with the silicone rings protruding from the circumferential surface of the left wheel.

[0010] Furthermore, a window is opened on the lower hem support plate, and a blower pipe is fixed inside the window. The blower pipe's nozzle faces the overlock sewing machine for boning.

[0011] Furthermore, the distance between the air blowing hole and the overlock sewing machine needle is 5-10mm. After the bone position sensor detects the bone position, the bone position moves to the space between the air blowing tube and the presser foot after passing the set distance. The solenoid valve then activates to start blowing air, thus realizing the bone-removing function.

[0012] Furthermore, the motor that drives the left wheel to rotate is built into the left wheel.

[0013] Compared with existing technologies, this utility model combines structural innovation with process adaptability, specifically addressing the shortcomings of existing technologies in overlock sewing processes. Its technical effects are mainly reflected in the following aspects: I. Automated Integration of Edge Trimming and Overlocking Processes Breaking through the limitations of existing technologies, this invention achieves integrated "edge cutting-edge binding" operations. By integrating edge cutting functionality into the overlock sewing machine and cooperating with the lower hem support plate, edge cutting and overlock sewing are completed simultaneously, significantly improving production efficiency. During the edge cutting process, the module drives the photoelectric sensor to move in coordination with the lower hem support plate, ensuring that the cutter operates precisely along the preset trajectory, avoiding edge distortion caused by uneven tension due to dual-wheel drive, and resulting in a significant improvement in edge cutting quality compared to existing technologies.

[0014] II. Fabric Tension Control and Dynamic Correction Employing a left-right wheel active drive design, coupled with tension sensors, it achieves tension adjustment for fabrics of different sizes. The right wheel actively feeds the fabric via a correction drag belt, with its rotation speed synchronized in real time with the overlock sewing machine's edge-cutting speed. The left wheel's spacing is adjusted by a linear motion module, effectively avoiding tension fluctuations caused by active drive and significantly reducing fabric deformation. The circumferentially distributed correction drag belts work in conjunction with the fabric-pushing cylinder assembly to form a multi-dimensional dynamic correction mechanism. When fabric edge deviation is detected, the controller drives the corresponding area belt to rotate and correct the fabric, achieving dual position correction in both the conveying and edge-cutting stages. The correction accuracy is significantly improved compared to existing technologies.

[0015] III. Size Adaptability and Changeover Efficiency Optimization Equipped with fully automatic size adaptation capabilities, it overcomes the limitations of existing technologies that rely on manual adjustment of wheel spacing. The control system automatically adjusts the position of the left wheel via a linear motion module based on the fabric width signal, efficiently adapting to various fabric sizes. A silicone ring embedded in the left wheel enhances stability and prevents slippage. The equipment adopts a modular design, significantly reducing setup workload and greatly improving the ease of process switching.

[0016] IV. Fabric boning and energy consumption optimization The quality of the fabric rebar shaping process has been significantly improved. The air blower on the lower hem plate achieves rebar shaping through small air holes, blowing air along the fabric edges to prevent curling. This precise application to the rebar area effectively improves the smoothness of the rebar lines. In terms of energy consumption control, the built-in design of the left-wheel drive motor reduces transmission losses. The air blower only operates during operation, and combined with the controller's sleep mode: the equipment automatically switches to a low-power state when idle, cutting off power to unnecessary components. When there is no fabric input, a deep sleep mode is triggered, resulting in a significant reduction in overall energy consumption compared to traditional equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0019] Figure 3 This is a structural schematic diagram from another perspective of the present invention.

[0020] Figure 4 yes Figure 3 A magnified view of a portion of the image. Detailed Implementation

[0021] like Figure 1-4 An automatic overlock sewing device for hems is shown, comprising: 100 is a platform used to support the overall structure of the equipment. The overlock sewing machine 200 is fixed on the table 100 and integrates the edge cutting function. A lower hem support plate 201 coplanar with it is fixed around the needle plate. The right wheel assembly 300 includes a right wheel 301 located on the fabric feeding side of the overlock sewing machine 200 and capable of active rotation. The upper edge of the right wheel 301 is tangent to the upper surface of the lower hem support plate 201. Multiple rotatable correction drag belts 302 are evenly distributed around the right wheel 301. The left wheel assembly 400 includes a left wheel 401 located on the fabric outlet side of the overlock sewing machine 200 and capable of active rotation. The upper edge of the left wheel 401 is 9mm lower than the upper surface of the lower swing plate 201. The left wheel 401 is driven by the linear motion module 402 to move left and right in the horizontal direction. The fabric pushing cylinder assembly 500 includes a telescopic cylinder 501 with a stroke in the forward and backward direction, which is fixed between the overlock sewing machine 200 and the right wheel assembly 300. The driving end of the telescopic cylinder 501 is connected to the vertical push plate 502. The lower end of the vertical push plate 502 extends below the hem support plate 201. A flat pressure plate 503 is fixed on the vertical push plate 502. The gap between the flat pressure plate 503 and the hem support plate 201 is adapted to the thickness of the hem fabric.

[0022] Work process: I. Fabric clamping and tensioning stage 1. Fabric setting and initial positioning Place the garment's circular hem onto the right and left wheels, ensuring the hem edge is flat against the surface of the hem support plate. At this point, the upper edge of the right wheel is tangent to the hem support plate, forming a reference plane for fabric transport and ensuring the fabric is initially positioned correctly.

[0023] 2. Automatic adjustment of left wheel spacing The linear motion module uses a tension sensor to preset the horizontal movement of the left wheel based on the fabric size signal, dynamically adjusting the distance between the left and right wheels. For different fabric sizes, it automatically matches an appropriate wheel spacing, ensuring the hem is evenly taut and preventing looseness or overstretching.

[0024] 3. Pre-positioning of the fabric pushing cylinder The telescopic cylinder drives the vertical push plate to move forward, so that the gap between the flat pressure plate and the lower support plate is adapted to the fabric thickness, preparing for the fine adjustment of the position in the subsequent edge trimming process.

[0025] II. Fabric conveying and dynamic correction stage 1. Right wheel active drive and fabric conveying The right-wheel drive motor starts, causing the right wheel to rotate actively. The circumferentially arranged guide belt pulls the fabric forward through friction. The rotation speed of the right wheel is synchronized with the cutting speed of the overlock sewing machine in real time, ensuring that the fabric passes through the cutting blade working area at a uniform speed.

[0026] 2. Real-time correction control When the edge of the fabric shifts due to fabric elasticity or overlay error, the corrective belt automatically adjusts its rotation according to the direction of the shift. If the fabric is too far forward, the belt in the corresponding area will rotate backward to pull the fabric back to the target position; If the fabric is positioned too far back, the corresponding belt rotates forward, pushing the fabric to the preset track to ensure that the edge is always aligned with the cutting blade's operating path.

[0027] III. Edge Trimming and Overlocking Stage 1. Fine-tuning the edges and securing the fabric. When the fabric enters the overlock sewing machine, the sewing machine cutter starts to trim off the excess fabric edges, and then the sewing machine sews. At this time, the gap is precisely adapted to the fabric thickness, effectively preventing the fabric from slipping during trimming and ensuring accurate trimming.

[0028] 2. Overlock sewing machine integrates edge cutting and edge binding. The integrated cutter of the overlock sewing machine starts, simultaneously completing two processes: The cutter cuts the fabric along the edge of the hem support plate, and the width of the cut edge is determined by the photoelectric sensor. The overlock sewing machine's needle plate, in conjunction with the stitch mechanism, binds and sews the cut edges to create a strong overlock effect.

[0029] 3. Anti-rolling edge and reverse-bone support The air blower on the hem support plate is activated in conjunction with the cutter to blow the fabric flat with appropriate air pressure, preventing poor cutting caused by fabric curling; at the same time, the airflow assists in the fabric edge shaping, improving the quality of the process.

[0030] IV. Cyclic Operation and Size Switching Phase 1. Continuous circular stitching The right wheel continuously drives the fabric to rotate, completing the continuous overlock stitching of the circular hem. The left wheel passively follows the fabric's rotation, maintaining tension at all times until the entire circle is sewn.

[0031] 2. Automatic code switching and adaptation When changing to different sizes of fabric, the linear motion module automatically adjusts the position of the left wheel according to the new size signal, automatically matching and recognizing the size. The equipment quickly completes the wheel track adaptation, achieving flexible production and meeting the overlock sewing needs of multi-size fabrics.

[0032] In summary, this embodiment achieves fully automated operation from fabric placement to overlocking through a standardized process of "clamping and tightening - conveying and correcting deviations - edge trimming and overlocking - cyclical pattern changing". The various functional modules work collaboratively, overcoming the limitations of traditional equipment and forming an automated solution that combines efficiency and precision, especially suitable for complex process scenarios such as "overlocking first, then covering".

[0033] In another preferred embodiment, a control system is further included, the control system comprising a controller and an electrically connected drive module, the controller being electrically connected to the following components: The drive motor of the right wheel 301 is used to control the active rotation speed of the right wheel 301; The drive motor of the corrective mop belt 302 is used to adjust the front and rear position of the hem fabric. The drive motor of the linear motion module 402 is used to adjust the distance between the left wheel 401 and the right wheel 301 according to the size of the hem fabric. The telescopic cylinder 501 of the fabric pushing cylinder assembly 500 is used to control the forward and backward pushing action of the flat pressure plate 503. When the sewing process ends, the flat pressure plate is triggered to push the fabric away from the sewing machine working area to prevent the fabric from being repeatedly sewn due to the continuous operation of the sewing mechanism. The fabric boning detection device 601 is fixed to the right side of the right wheel 301 and is used to detect the boning position of the hem fabric and feed it back to the controller to control the start and stop of the sewing machine.

[0034] By electrically connecting the controller and drive module to each actuator, the system achieves coordinated control of the right wheel speed, the corrective belt action, the left wheel spacing adjustment, the flat pressure plate pushing, and the fabric photodetector detection, thus constructing an automated closed-loop adjustment system to replace traditional manual intervention.

[0035] In another preferred embodiment, the fabric seam detection device 601 is an infrared photoelectric sensor arranged along the axial direction of the right wheel 301. The infrared photoelectric sensor can accurately capture changes in the fabric seam position, with a fast response speed, ensuring real-time feedback of the seam position signal during fabric transport, providing accurate data for sewing machine start / stop control. Its axial arrangement along the right wheel covers the full width of the fabric, avoiding detection blind spots caused by variations in fabric width, and adapting to the seam positioning needs of different fabric sizes. Utilizing infrared principles avoids damage to the fabric caused by mechanical contact, making it particularly suitable for seam detection of elastic or sensitive fabrics, improving finished product quality. Linked with the corrective belt, when a seam position signal is detected, the sewing machine starts / stops after a set distance, forming a closed-loop control of "detection-feedback-control," further improving the accuracy of fabric transport, start and end positions.

[0036] In another preferred embodiment, an edge-cutting photoelectric sensor 602 is also included, comprising a micro motor 6021 fixed to the right side of the fabric-pushing cylinder assembly 500. The drive shaft of the micro motor 6021 is fixedly connected to a lead screw 6022, the lead screw 6022 is screwed to a nut 6023, and the nut 6023 is fixedly connected to an edge-cutting photoelectric sensor 6024 for detecting the edge offset of the fabric. When the detected offset exceeds 0.2mm, the controller drives the correction mop belt 302 according to the following logic: if the fabric is in front, the correction mop belt 302 is driven to rotate backward; if the fabric is in back, the correction mop belt 302 is driven to rotate forward. This embodiment uses a screw-nut mechanism driven by a micro motor fixed to the right side of the fabric pushing cylinder assembly to fix the cutting photoelectric sensor to the nut, forming an edge detection unit that can be adjusted back and forth. When the cutting photoelectric sensor detects that the fabric edge offset exceeds a preset threshold, the controller drives the corresponding area's correction drag belt to rotate in the opposite direction according to the offset direction, realizing a closed-loop control of "photoelectric sensor dynamic detection - offset feedback - belt correction adjustment", thereby correcting the fabric conveying trajectory in real time, ensuring the accuracy of the cutting edge position and avoiding overlocking errors caused by edge offset.

[0037] In another preferred embodiment, the cutting eye 6024 achieves front-to-back displacement adjustment via a screw 6022-nut 6023 mechanism, with an adjustment accuracy of 0.1mm. The controller synchronously drives the micro motor 6021 to adjust the front-to-back position of the cutting eye 6024 based on the rib position signal from the fabric rib detection device 601, ensuring that the fabric edge to be cut is always aligned with the cutting eye 6024, forming a "sharp eye collaborative positioning" mechanism. In this embodiment, the cutting eye achieves front-to-back displacement adjustment with 0.1mm accuracy via a screw-nut mechanism. When preparing the fabric, the position of the eye can be set. After the sewing machine starts, the cutting amount can also be controlled by setting the position of the eye. During stitching, the eye can be moved to the set stitching position for more precise stitching. Furthermore, according to the needs of different hem processes, the position of the eye can be set in segments to sew curved hems, improving the accuracy and adaptability of the cutting process for complex fabrics.

[0038] In another preferred embodiment, multiple silicone rings 403 are embedded on the left wheel 401, with the silicone rings 403 protruding from the circumferential surface of the left wheel 401. The protruding silicone rings embedded on the circumferential surface of the left wheel increase the friction of the contact surface, thereby improving the stability of the fabric and preventing the fabric from slipping or shifting during sewing.

[0039] In another preferred embodiment, a window is provided on the lower hem support plate 201, and an air blowing pipe 202 is fixed inside the window. The air blowing pipe 202 is provided with small air blowing holes facing the overlock sewing machine 200 for boning. In this embodiment, by providing a window in the lower hem support plate 201 and fixing the air blowing pipe 202, the small air blowing holes are directed towards the boning area of ​​the overlock sewing machine 200. The high-pressure airflow forms dynamic support at the edge of the fabric, guiding the fabric to fold naturally and adhere to the needle plate, simultaneously achieving boning and waste removal. Compared with traditional mechanical boning, the airflow is more uniform and wear-free, making it particularly suitable for thin or fragile fabrics. It significantly improves the flatness and consistency of the boning lines, reduces the risk of debris entangled in the needle or embedded in the stitches, and lowers equipment failure and defect rate. The modular structure of the window and air blowing pipe facilitates maintenance, and the air blowing angle and air pressure parameters can be adjusted according to different fabric characteristics, enhancing the equipment's process adaptability.

[0040] In another preferred embodiment, the distance between the air blowing hole and the 200 needle of the overlock sewing machine is 5-10mm. When the boning sensor detects the boning position, the boning position moves to the space between the air blowing tube and the presser foot after a set distance, and the solenoid valve activates to start blowing air, thus realizing the boning function. This embodiment, by adding air blowing holes to the air blowing tube, allows the airflow to act evenly and concentratedly on the boning area at the edge of the fabric, avoiding poor boning effect or fabric damage caused by air pressure dispersion. At the same time, the intelligent linkage mechanism between the air blowing tube and the boning position detection ensures that when the boning sensor detects the boning position, the boning position moves to the space between the air blowing tube and the presser foot after a set distance, the solenoid valve activates to start blowing air, and the blowing automatically shuts off after boning. This ensures the stability and efficiency of the boning process while avoiding unnecessary energy consumption, effectively improving the intelligence and energy-saving effect of the equipment operation.

[0041] In another preferred embodiment, the motor driving the left wheel 401 to rotate is built into the left wheel 401. This design, which integrates the motor driving the left wheel, revolutionizes the traditional external motor transmission mode, significantly reducing intermediate transmission components such as belts and couplings, thereby reducing transmission losses and improving power transmission efficiency. Simultaneously, the compact built-in structure optimizes the equipment's spatial layout, avoiding the problem of external motors occupying extra space or interfering with other components, reducing operating noise and maintenance complexity, and enhancing the overall stability and reliability of the equipment. It is particularly suitable for automated overlock sewing operations with high space and precision requirements.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic overlock sewing hem device, comprising a table (100) for supporting the overall structure of the device, characterized in that: Also includes The overlock sewing machine (200) is fixed on the table (100) and integrates the edge cutting function. A lower hem support plate (201) coplanar with it is fixed around its needle plate. The right wheel assembly (300) includes a right wheel (301) located on the fabric feeding side of the overlock sewing machine (200) and capable of active rotation. The upper edge of the right wheel (301) is tangent to the upper surface of the lower hem support plate (201). Multiple rotatable correction drag belts (302) are evenly distributed on the right wheel (301) in the circumferential direction. The left wheel assembly (400) includes a left wheel (401) located on the fabric output side of the overlock sewing machine (200) and capable of active rotation. The upper edge of the left wheel (401) is 9mm lower than the upper surface of the lower heel support plate (201). The left wheel (401) is driven by the linear motion module (402) to move left and right in the horizontal direction. The fabric pushing cylinder assembly (500) includes a telescopic cylinder (501) with a stroke in the forward and backward direction, which is fixed between the overlock sewing machine (200) and the right wheel assembly (300). The driving end of the telescopic cylinder (501) is connected to the vertical push plate (502). The lower end of the vertical push plate (502) extends below the hem support plate (201). A flat pressure plate (503) is fixed on the vertical push plate (502). The gap between the flat pressure plate (503) and the hem support plate (201) is adapted to the thickness of the hem fabric.

2. The automatic overlock sewing hem device according to claim 1, characterized in that: It also includes a control system, which comprises a controller and an electrically connected drive module, the controller being electrically connected to the following components: The drive motor of the right wheel (301) is used to control the active rotation speed of the right wheel (301); The drive motor of the corrective mop belt (302) is used to adjust the front and rear position of the hem fabric. The drive motor of the linear motion module (402) is used to adjust the distance between the left wheel (401) and the right wheel (301) according to the size of the hem fabric; The telescopic cylinder (501) of the fabric pushing cylinder assembly (500) is used to drive the flat pressure plate (503) to perform forward and backward pushing actions. When the sewing process ends, the flat pressure plate is triggered to push the fabric away from the sewing machine working area to prevent the fabric from being repeatedly sewn due to the continuous operation of the sewing mechanism. A fabric boning detection device (601) is fixed on the right side of the right wheel (301) to detect the boning position of the hem fabric and feed it back to the controller to control the start and stop of the sewing machine.

3. The automatic overlock sewing hem device according to claim 2, characterized in that: The fabric rib detection device (601) is an infrared photodetector, arranged along the axial direction of the right wheel (301).

4. The automatic overlock sewing hem device according to claim 2, characterized in that: It also includes a cutting edge photodetector (602), which includes a micro motor (6021) fixed on the right side of the fabric pushing cylinder assembly (500). The drive shaft of the micro motor (6021) is fixed to a lead screw (6022), the lead screw (6022) is screwed to a nut (6023), and the nut (6023) is fixed to a cutting edge photodetector (6024) for detecting the edge offset of the fabric. When the detected offset exceeds 0.2mm, the controller drives the correction mop belt (302) according to the following logic: if the fabric is in front, the correction mop belt (302) is driven to rotate backward; if the fabric is in back, the correction mop belt (302) is driven to rotate forward.

5. The automatic overlock sewing hem device according to claim 4, characterized in that: The cutting photoelectric sensor (6024) is adjusted in front and back position through a screw (6022)-nut (6023) mechanism with an adjustment accuracy of 0.1mm. The controller synchronously drives the micro motor (6021) to adjust the front and back position of the cutting photoelectric sensor (6024) according to the bone position signal of the fabric bone position detection device (601), so that the edge of the fabric to be cut is always aligned with the cutting photoelectric sensor (6024), forming a "photoelectric sensor cooperative positioning" mechanism.

6. The automatic overlock sewing hem device according to claim 1, characterized in that: Multiple silicone rings (403) are embedded on the left wheel (401), and the silicone rings (403) protrude from the circumferential surface of the left wheel (401).

7. The automatic overlock sewing hem device according to claim 1, characterized in that: A window is provided on the lower hem support plate (201), and a blower pipe (202) is fixed inside the window. The blower pipe (202) has small air holes and faces the overlock sewing machine (200) for boning.

8. An automatic overlock sewing hem device according to claim 7, characterized in that: The distance between the air blowing hole and the needle of the overlock sewing machine (200) is 5-10mm; when the bone position sensor detects the bone position, after passing the set distance, the bone position moves between the air blowing tube and the presser foot, and the solenoid valve starts blowing air to realize the bone-reversing function.

9. An automatic overlock sewing hem device according to claim 1, characterized in that: The motor that drives the left wheel (401) to rotate is built into the left wheel (401).

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