A waist head main mark positioning sewing structure

Abstract

The application relates to the field of sewing machines, in particular to a waist head main label positioning and sewing structure. The waist head main label positioning and sewing structure comprises a presser foot and a positioning assembly, the presser foot is installed on a sewing sliding platform, the positioning assembly comprises an upper pressing plate and a lower closing plate, the lower closing plate is installed on the sewing sliding platform, the upper pressing plate is installed above the lower closing plate, the lower closing plate is provided with a main label positioning groove and a plurality of sewing through holes, the sewing through holes are communicated with the main label positioning groove; the upper pressing plate is provided with a pressing plate positioning notch, the upper pressing plate is provided with a plurality of avoiding through holes at the bottom of the pressing plate positioning notch, the pressing plate positioning notch is correspondingly arranged with the main label positioning groove, the avoiding through holes are correspondingly arranged with the sewing through holes and are communicated with the corresponding sewing through holes; when sewing, the presser foot drives the upper pressing plate to move towards the lower closing plate, and the waist head main label is pressed tightly, the position relationship between the waist head and the main label does not need to be adjusted by relying on manual assistance, and only manual stretching of the waist head rubber band can realize accurate positioning and efficient sewing of the waist head and the main label.

Description

Technical Field

[0001] This application relates to the field of sewing machines, and in particular to a positioning and sewing structure for a waistband main label. Background Technology

[0002] Pattern sewing machines are widely used in garment processing, playing a crucial role, especially in waistband stitching. A typical pattern sewing machine assembly includes: a frame, control panel, motor, sewing platform, presser foot, and sewing needle. The sewing platform holds the fabric, while the presser foot is mounted on the machine frame and suspended above it. The control panel drives the motor to move the sewing platform and presser foot. The sewing needle is mounted on the frame and passes through the presser foot's hole. The working principle of the pattern sewing machine assembly is as follows: the machine receives instructions via the control panel, which then drives the internal motor to move the sewing platform to the designated position. Simultaneously, one motor drives the presser foot downwards to contact the fabric on the sewing platform. Another motor then drives the sewing needle in a reciprocating motion, piercing the fabric and forming a loop. The presser foot applies pressure to the fabric during sewing, ensuring a smooth and perfect stitch. Throughout the process, the coordinated operation of the sewing platform, presser foot, and sewing needle completes the sewing of complex patterns. With the increasing demands for production efficiency and product quality in the garment industry, pattern sewing machine technology has gradually become a key means to improve the level of automation and standardization in production, significantly enhancing the overall efficiency and quality of garment production. Currently, the following methods are commonly used to solve the problem of waistband label alignment during sewing: First, manual sewing using a flatbed sewing machine, where the operator needs to allow for the stretched label capacity based on experience and manually adjust the waistband position to ensure sewing accuracy; second, using a fixed clamp in conjunction with a regular sewing machine, with the clamp fixing the waistband and label. However, while existing technologies can achieve waistband label alignment to a certain extent, they still have the following drawbacks: Because the fixed clamp is used with a regular sewing machine, it is easy for the clamp to loosen when manually stretching the waistband elastic for sewing, requiring frequent adjustments to its position. This necessitates manual adjustment of the waistband and label's positional relationship, meaning that stretching the waistband elastic and positioning the label both require simultaneous manual intervention. This operation is complex and susceptible to human error, leading to poor product consistency, high rework rates, and low production efficiency. This problem is particularly prominent in modern garment manufacturing, which pursues high efficiency and high precision. Utility Model Content

[0003] In order to achieve the stitching process of the waistband of the patterned locomotive without relying on manual assistance to adjust the positional relationship between the waistband and the main label, this application provides a positioning and stitching structure for the waistband and the main label, which can achieve precise positioning and efficient stitching by simply stretching the elastic band of the waistband.

[0004] To achieve the above objectives, this application provides a positioning and sewing structure for a main label on a waistband, including a presser foot and a positioning assembly. The presser foot is mounted on a sewing sliding platform. The positioning assembly includes an upper pressure plate and a lower sealing plate. The lower sealing plate is mounted on the sewing sliding platform. The upper pressure plate is mounted on the end of the presser foot away from the sewing sliding platform and is located above the lower sealing plate. The side of the lower sealing plate away from the sewing sliding platform is provided with a main label positioning groove for placing the main label and at least one sewing through hole. The sewing through hole communicates with the main label positioning groove. The upper pressure plate has a pressure plate positioning notch corresponding to the main label positioning groove and an avoidance through hole corresponding to the sewing through hole. The avoidance through hole communicates with the pressure plate positioning notch. During sewing, the presser foot is driven to move the upper pressure plate toward the lower sealing plate, and the sewing needle moves downward and passes through the avoidance through hole, the main label, and the sewing through hole in sequence. By adopting the above technical solution, during the sewing process, the lower plate is fixed to the sewing sliding platform, and the main label is placed in the main label positioning groove. Due to the setting of the main label positioning groove, the position of the main label can be accurately positioned, avoiding the errors caused by the traditional manual adjustment of the main label position. At the same time, the sewing through hole of the lower plate is connected to the main label positioning groove, providing a precise puncture path for the sewing needle and ensuring that the stitches pass through the main label accurately. The pressure plate positioning notch corresponds to the main label positioning groove. The waistband is manually stretched and aligned with the pressure plate positioning notch and placed between the upper pressure plate and the lower plate. The upper pressure plate moves towards the lower plate through the drive of the presser foot, pressing the waistband and the main label together. Since the upper pressure plate clearance through hole corresponds to the sewing through hole above and below the main label and waistband, the sewing needle can smoothly pass through the clearance through hole, the main label, and the sewing through hole to complete the sewing action. In summary, this structure effectively solves the problem that the waistband elastic stretching and main label positioning need to be handled manually in the existing technology, realizing automated and high-precision sewing effects, and significantly improving production efficiency and finished product consistency. Preferably, the cross-sectional area of ​​the sewing through-hole on the lower plate is smaller than the cross-sectional area of ​​the main label positioning groove. By adopting the above technical solution, the cross-sectional area of ​​the sewing through-hole on the lower plate is smaller than the cross-sectional area of ​​the main label positioning groove. This design effectively prevents damage to the edge of the main label from the sewing needle during the sewing process. Specifically, the main label is placed in the main label positioning groove. Since the cross-sectional area of ​​the groove is larger than the sewing through-hole, it provides sufficient space for the main label, ensuring that the main label will not shift or deform under pressure. Simultaneously, the smaller sewing through-hole can accurately guide the movement path of the sewing needle, allowing the needle to accurately pass through the main label and be fixed to the waist, thereby improving sewing accuracy. Furthermore, this structural design reduces the probability of contact between the sewing needle and the non-sewn area of ​​the main label, reducing the risk of wear and further improving the consistency and durability of the finished product. Preferably, the edge of the avoidance through-hole is chamfered. By adopting the above technical solution, the chamfered edge of the avoidance through-hole effectively reduces the probability of the sewing needle scraping against the hole wall when passing through the avoidance through-hole.Specifically, during the sewing process, the sewing needle needs to precisely pass through the clearance hole to complete the sewing action. If the edge of the clearance hole is not chamfered, its sharp edges may obstruct or scratch the sewing needle, thus affecting the smoothness and accuracy of the sewing. However, with a chamfer, the entrance to the clearance hole forms a gradually transitioning slope, providing more guiding space for the sewing needle, making it easier to align and pass through the clearance hole. This design not only improves the stability of the sewing process but also extends the service life of the sewing needle and the clearance hole, thereby enhancing the reliability and durability of the overall sewing structure. Preferably, the depth of the main label positioning groove is greater than or equal to the thickness of the main label. By adopting the above technical solution, the groove depth of the main label positioning groove is designed to be greater than or equal to the thickness of the main label, ensuring that the main label is fully embedded when placed in the positioning groove. This design not only effectively prevents the main label from shifting position during the sewing process but also ensures that the surface of the main label is flush with or slightly lower than the upper surface of the lower plate. When the upper pressure plate presses down, the pressure plate positioning notch mates with the main label positioning groove, further fixing the position of the main label. This ensures that the sewing needle can accurately pierce the main label when passing through the avoidance hole and the sewing through hole, forming a stable stitch connection. Since the main label is firmly confined within the positioning groove, the entire sewing process requires no manual intervention to adjust the main label position, significantly improving sewing accuracy and efficiency. Simultaneously, it reduces the rework rate caused by main label misalignment, improving product qualification rate and consistency. Preferably, the presser foot includes a presser foot body, a presser foot movable component, and a pressure plate mounting part. The presser foot body is disposed on the sewing sliding platform, the presser foot movable component is mounted at the end of the presser foot body away from the sewing sliding platform, the pressure plate mounting part is mounted at the output end of the presser foot movable component, and the upper pressure plate is mounted on the side of the pressure plate mounting part away from the presser foot movable component. By adopting the above technical solution, the presser foot movable component is installed at the end of the presser foot body away from the sewing sliding platform, and the pressure plate mounting part is further installed at the output end of the presser foot movable component. This split structure design allows the presser foot movable component to operate independently. When the motor drives the presser foot movable component to move, the presser foot movable component transmits the motion to the pressure plate mounting part, causing it to move downward. Since the upper pressure plate is installed on the side of the pressure plate mounting part away from the presser foot movable component, the movement of the pressure plate mounting part will directly drive the upper pressure plate to press downward. This design not only achieves precise control of the upper pressure plate, but also ensures a tight fit between it and the lower mounting plate. During the sewing process, the upper pressure plate and the lower mounting plate work together to ensure the stable fixation of the main label in the main label positioning groove, thereby improving sewing accuracy and consistency, reducing manual intervention, and increasing production efficiency. Preferably, the presser foot body includes: an integrally formed first mounting part and a second mounting part, the first mounting part being installed on the sewing sliding platform, and the second mounting part being suspended above the sewing sliding platform.By adopting the above technical solution, the presser foot body is composed of an integrally formed first mounting part and a second mounting part. The first mounting part is directly installed on the sewing sliding platform, ensuring the stability of the entire structure. The design of the second mounting part, which is suspended above the sewing sliding platform, provides sufficient operating space for the operation of the upper presser plate and the lower closing plate. This integrated structural design not only simplifies the manufacturing process of the presser foot body but also enhances its structural strength, avoiding problems such as loosening or detachment of the joints due to long-term use. In the actual sewing process, the first mounting part, as the fixed end, can effectively transmit the force driven by the motor to the moving parts of the presser foot, thereby driving the upper presser plate to press down precisely and fit tightly with the lower closing plate, ensuring the stable positioning of the main label within the main label positioning groove. At the same time, the suspended design of the second mounting part does not interfere with the movement of the fabric on the sewing sliding platform, further improving sewing accuracy and efficiency. Preferably, the presser foot movable component includes: a drive rod, a movable plate, and a fastener. The drive rod is installed on the first mounting part and the second mounting part. The second mounting part is provided with a sliding groove. The movable plate is provided with a mounting hole. The fastener passes through the mounting hole and the sliding groove, connecting to allow the movable plate to be slidably installed on the second mounting part. The output end of the drive rod is connected to the movable plate, and a motor drives the drive rod to move the movable plate downward. By adopting the above technical solution, the design of the presser foot movable component achieves precise control of the upper pressure plate. Specifically, the drive rod is installed between the first mounting part and the second mounting part, providing stable support and transmission path for the entire movable component. When the motor drives the drive rod, its output end can drive the movable plate to move smoothly along the sliding groove. The movable plate is connected to the second mounting part through the fastener. This adjustable connection method ensures the precise positioning of the movable plate during movement. At the same time, since the movable plate is connected to the pressure plate mounting part, its downward movement is further transmitted to the upper pressure plate, thereby achieving accurate downward pressure of the upper pressure plate. This design not only improves the automation level of the device but also effectively avoids errors that may be caused by manual operation, significantly improving the accuracy and stability of the main label positioning during sewing. Preferably, the pressure plate mounting part includes at least one mounting piece, one end of which is detachably mounted to the movable plate, and the upper pressure plate is detachably mounted to the end of the mounting piece away from the movable plate. By adopting the above technical solution, one end of the mounting piece is detachably mounted to the movable plate, allowing the upper pressure plate to be connected to the movable plate through the mounting piece. When the motor drives the presser foot movable part to move, the movable plate moves downward accordingly, causing the mounting piece and the upper pressure plate mounted on it to move downward synchronously. Since the upper pressure plate and the lower plate cooperate with each other, this detachable connection method not only facilitates the installation and removal of the upper pressure plate but also allows for the quick replacement of upper pressure plates of different specifications to adapt to different sewing needs when required.Meanwhile, this design ensures the stability of the upper pressure plate as it moves with the movable plate, guaranteeing precise contact with the lower platen. This improves the accuracy and stability of the main label positioning during sewing, effectively reducing manual intervention and enhancing sewing efficiency and product consistency. Preferably, there are two mounting pieces, spaced apart and horizontally arranged. By adopting the above technical solution, setting the number of mounting pieces to two, and having them spaced apart and horizontally arranged, effectively improves the stability of the upper pressure plate under the drive of the presser foot's movable component. Specifically, the two horizontally spaced mounting pieces form a stable support structure. When the presser foot's movable component moves the pressure plate mounting part downwards, the two mounting pieces can evenly distribute the force, preventing the upper pressure plate from tilting or shifting due to uneven force on a single mounting piece. Furthermore, the two horizontally arranged mounting pieces also enhance the rigidity of the overall structure, reducing the impact of vibration on the fit accuracy between the upper pressure plate and the lower platen during sewing, thereby ensuring more accurate main label positioning and improving sewing quality. Preferably, the upper pressure plate and the lower fitting plate are visible panels. The lower fitting plate is provided with a first metal sheet, and the upper pressure plate is provided with a second metal sheet. The first metal sheet is connected to the end of the lower fitting plate near the first mounting part, and the second metal sheet is connected to the upper surface of the upper pressure plate. The first mounting part is connected to the first metal sheet, and the pressure plate mounting part is connected to the second metal sheet. By adopting the above technical solution, the upper pressure plate and the lower fitting plate are set as visible panels, which allows the operator to easily observe the position and status of the main label in real time during the sewing process, thereby effectively improving the accuracy of sewing. The first metal sheet and the second metal sheet are respectively connected to the lower fitting plate and the upper pressure plate, and are also connected to the first metal sheet and the pressure plate mounting part respectively. This structural design not only enhances the overall stability of the positioning component, but also ensures the precise alignment of the upper pressure plate and the lower fitting plate during the sewing process. Specifically, the connection between the first metal sheet and the first mounting part ensures the stability of the lower fitting plate, while the connection between the second metal sheet and the pressure plate mounting part ensures that the upper pressure plate can accurately move up and down following the drive of the presser foot moving part. Therefore, the entire positioning component can achieve precise positioning and stable pressing of the main label during the sewing process, avoiding the problems of poor product consistency and high rework rate caused by manual adjustment in traditional methods, and significantly improving production efficiency and product quality.

[0005] In summary, this application includes at least one of the following beneficial technical effects: 1. During the sewing process, a positioning assembly consisting of an upper pressure plate and a lower fitting plate enables precise positioning of the main label. Specifically, the main label positioning groove on the lower fitting plate is used to fix the main label position, ensuring that the main label will not shift during sewing. The pressure plate positioning notch on the upper pressure plate is correspondingly set with the main label positioning groove, further enhancing the positioning accuracy of the main label. The reasonable design of the main label positioning groove and the avoidance through hole ensures that the sewing needle can accurately pass through the main label for sewing operations. Compared with the traditional method of manually adjusting the waistband and main label position, this structure can significantly reduce errors caused by human factors, thereby improving the consistency of finished products and reducing the rework rate. 2. The presser foot includes: the presser foot body, the presser foot movable part, and the presser plate mounting part. The three parts work together to drive the upper presser plate to abut against the lower plate. The structural design ensures the stability and reliability of the entire pressing process and further improves the automation level of the sewing process. Attached Figure Description

[0006] Figure 1 This is a structural diagram of a positioning seam structure for the main label at the waist; Figure 2 This is a right view of a positioning seam structure for a waist-head main label.

[0007] Explanation of reference numerals in the attached drawings: 1. Presser foot; 2. Upper pressure plate; 3. Lower closing plate; 11. Presser foot body; 12. Presser foot movable part; 13. Pressure plate mounting part; 21. Pressure plate positioning notch; 22. Clearance through hole; 23. Second metal plate; 31. Main label positioning groove; 32. Sewing through hole; 33. First metal plate; 111. First mounting part; 112. Second mounting part; 121. Drive rod; 122. Movable plate; 123. Fastener; 131. Mounting piece. Detailed Implementation

[0008] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0009] This application discloses a positioning and sewing structure for the main label at the waist, referring to... Figure 1 and Figure 2 The positioning sewing structure includes a presser foot 1 and a positioning assembly. The positioning assembly includes an upper presser plate 2 and a lower sealing plate 3. One end of the presser foot 1 is mounted on the sewing sliding platform, and the other end of the presser foot 1 extends outward and is suspended above the sewing sliding platform. The lower sealing plate 3 is mounted on the sewing sliding platform, and the upper presser plate 2 is mounted on the end of the presser foot 1 that is suspended above the sewing sliding platform. The upper presser plate 2 is located directly above the lower sealing plate 3 and is positioned opposite to the lower sealing plate 3.

[0010] Specifically, the side of the lower plate 3 away from the sewing sliding platform is provided with a main label positioning groove 31 and several sewing through holes 32. The sewing through holes 32 are connected to the main label positioning groove 31. The main label positioning groove 31 is used to place the main label, and the groove depth of the main label positioning groove 31 is greater than or equal to the thickness of the main label. The sewing through holes 32 are used for the sewing needle to pass through for sewing. In particular, the shape of the main label positioning groove 31 needs to be designed according to the shape of the main label.

[0011] Specifically, the upper pressure plate 2 has a pressure plate positioning notch 21 and several clearance through holes 22 on the end face away from the pressure foot 1. The clearance through holes 22 are opened at the bottom of the pressure plate positioning notch 21 and penetrate through both sides of the upper pressure plate 2. The pressure plate positioning notch 21 of the upper pressure plate 2 is set to correspond to the main positioning groove 31 of the lower plate 3. The clearance through holes 22 of the upper pressure plate 2 are set to correspond to the sewing through holes 32 of the lower plate 3. The clearance through holes 22 are connected to the sewing through holes 32. The cross-sectional area of ​​the sewing through holes 32 is smaller than the cross-sectional area of ​​the main positioning groove 31. The edge of the clearance through holes 22 is also provided with a chamfer. When the waistband is not in place, the motor drives the upper pressure plate 2 to move downwards, allowing the upper pressure plate 2 to abut against the lower plate 3. The edge of the pressure plate positioning notch 21 abuts against the edge of the main label, thus pressing the edge of the main label tightly. During sewing, the waistband needs to be stretched out manually and placed horizontally in alignment with the position of the pressure plate positioning notch 21. Then, the motor drives the presser foot 1 to move the upper pressure plate 2 toward the lower plate 3, pressing the main label of the waistband tightly. Since the clearance through hole 22 and the sewing through hole 32 are distributed vertically above and below the main label, precise positioning is achieved, allowing the sewing needle to pass through the clearance through hole 22, the main label, and the sewing through hole 32 in sequence for sewing. This improves the accuracy of sewing, reduces human intervention, and increases production efficiency. In this embodiment, the outer contour of the main label is rectangular. Correspondingly, the main label positioning groove 31 and the pressure plate positioning notch 21 are both rectangular. The size of the pressure plate positioning notch 21 is slightly larger than the size of the main label positioning groove 31 to ensure that the main label can be pressed tightly. The clearance through hole 22 can be a circular hole or a rectangular hole. In this embodiment, a rectangular hole is preferred to ensure the firmness of the main label sewing and make the main label less likely to be torn. Furthermore, both the upper pressure plate 2 and the lower composite plate 3 are rectangular visible panel structures, specifically visible acrylic sheets, which are low in cost and highly practical. Both the upper pressure plate 2 and the lower composite plate 3 are detachably installed via a fixing structure. The fixing structure used to fix the upper pressure plate 2 and the lower composite plate 3 can be screws, bolts, etc. Since both the upper pressure plate 2 and the lower composite plate 3 in this embodiment are visible acrylic sheets, for the sake of installation stability, a first metal piece 33 with a mounting hole is installed at the end of the lower composite plate 3 near the pressure foot 1, and a second metal piece 23 with a mounting hole is installed above the upper pressure plate 2. The lower composite plate 3 is detachably installed by screwing or bolting through the mounting hole of the first metal piece 33, and the upper pressure plate 2 is detachably installed by screwing or bolting through the mounting hole of the second metal piece 23. The first metal piece 33 and the second metal piece 23 can both be made of high-strength materials such as stainless steel or aluminum alloy, which have good wear resistance and deformation resistance. Specifically, the presser foot 1 includes a presser foot body 11, a presser foot movable part 12, and a presser plate mounting part 13.The presser body 11 includes a first mounting part 111 and a second mounting part 112. The first mounting part 111 and the second mounting part 112 are integrally formed. The first mounting part 111 is mounted on the sewing sliding platform. The first mounting part 111 extends towards the sewing needle and is provided with the second mounting part 112, and the second mounting part 112 is suspended above the sewing sliding platform.

[0012] The pressure foot movable component 12 includes a drive rod 121, a movable plate 122, and a fastener 123. The drive rod 121 is mounted on an integrally formed first mounting part 111 and second mounting part 112. The input end of the drive rod 121 is connected to a motor, and the output end of the drive rod 121 is connected to the movable plate 122. The second mounting part 112 is provided with a sliding groove, and the movable plate 122 is provided with a mounting hole. The fastener 123 passes through the mounting hole and the sliding groove, so that the movable plate 122 can be slidably mounted on the second mounting part 112. The motor drives the drive rod 121 to move horizontally, and the drive rod 121 drives the movable plate 122 to move up and down reciprocally. When the drive rod 121 drives the movable plate 122 to move downward, the upper pressure plate 2 moves toward the lower closing plate 3.

[0013] The pressure plate mounting part 13 includes at least one mounting piece 131. One end of the mounting piece 131 is detachably mounted to the movable plate 122. The upper pressure plate 2 is detachably mounted to the end of the mounting piece 131 away from the movable plate 122. The number of mounting pieces 131 can be one, two, three, etc. In this embodiment, two sheet-like mounting pieces 131 are preferred, and the two mounting pieces 131 are installed on the movable plate 122 at intervals. The two mounting pieces 131 are horizontally arranged. This structural design makes the installation of the upper pressure plate 2 more stable. The implementation principle of this embodiment is as follows: The waistband main label positioning sewing structure includes a presser foot 1 and a positioning component. The presser foot 1 is composed of a presser foot body 11, a presser foot movable part 12, and a pressure plate mounting part 13. The presser foot body 11 is fixed to the sewing sliding platform through the first mounting part 111, and its extended second mounting part 112 is suspended. The drive rod 121 is connected to a motor to drive the movable plate 122 to move up and down along the sliding groove. The positioning assembly consists of an upper pressure plate 2 and a lower fitting plate 3. The lower fitting plate 3 is detachably mounted to the sewing sliding platform via a first metal piece 33. Its main label positioning groove 31 has a depth greater than or equal to the main label thickness and communicates with the sewing through hole 32. The upper pressure plate 2 is detachably mounted to the presser foot movable part 12 via a second metal piece 23. Its pressure plate positioning notch 21 and clearance through hole 22 correspond to the structure of the lower fitting plate 3. The chamfered edge design of the clearance through hole 22 ensures accurate positioning. When the presser foot 1 is driven, the upper pressure plate 2 moves closer to the lower fitting plate 3. The elastic band at the waist is manually stretched and aligned with the pressure plate positioning notch 21. The upper pressure plate 2 presses the waist band onto the lower fitting plate 3, so that the main label is pressed tightly between the rectangular pressure plate positioning notch 21 and the main label positioning groove 31. The sewing needle completes the sewing through the vertically aligned clearance through hole 22 and the sewing through hole 32, achieving efficient and accurate positioning. The upper and lower panels 3 are made of visible acrylic material, and the installation structure of the double-piece mounting plate 131 combines cost and stability.

[0014] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A positioning sewing structure for the main label at the waist, characterized in that, The device includes a presser foot (1) and a positioning assembly. The presser foot (1) is mounted on a sewing sliding platform. The positioning assembly includes an upper pressure plate (2) and a lower sealing plate (3). The lower sealing plate (3) is mounted on the sewing sliding platform. The upper pressure plate (2) is mounted on the end of the presser foot (1) away from the sewing sliding platform and is located above the lower sealing plate (3). The side of the lower sealing plate (3) away from the sewing sliding platform is provided with a main label positioning groove (31) for placing the main label and at least one sewing through hole (32). The sewing through hole (32) is positioned relative to the main label. The main label positioning groove (31) is connected; the upper pressure plate (2) has a pressure plate positioning notch (21) corresponding to the main label positioning groove (31), and the upper pressure plate (2) has a clearance through hole (22) corresponding to the sewing through hole (32). The clearance through hole (22) is connected to the pressure plate positioning notch (21). When sewing, the presser foot is driven to move the upper pressure plate (2) toward the lower plate (3), and the sewing needle moves down and passes through the clearance through hole (22), the main label, and the sewing through hole (32) in sequence.

2. The positioning and sewing structure for the main label at the waistband according to claim 1, characterized in that, The cross-sectional area of ​​the sewing through hole (32) of the lower plate (3) is smaller than the cross-sectional area of ​​the main positioning groove (31).

3. The positioning and sewing structure for the main label at the waistband according to claim 1, characterized in that, The edge of the clearance through hole (22) is chamfered.

4. The positioning and sewing structure for the main label at the waistband according to claim 1, characterized in that, The groove depth of the main label positioning groove (31) is greater than or equal to the thickness of the main label.

5. The positioning and sewing structure for the main label at the waistband according to claim 1, characterized in that, The presser foot (1) includes a presser foot body (11), a presser foot movable part (12), and a presser plate mounting part (13). The presser foot body (11) is disposed on the sewing sliding platform. The presser foot movable part (12) is installed at the end of the presser foot body (11) away from the sewing sliding platform. The presser plate mounting part (13) is installed at the output end of the presser foot movable part (12). The upper presser plate (2) is installed on the side of the presser plate mounting part (13) away from the presser foot movable part (12).

6. The positioning and sewing structure for the main label at the waistband according to claim 5, characterized in that, The presser body (11) includes: an integrally formed first mounting part (111) and a second mounting part (112), the first mounting part (111) being mounted on the sewing sliding platform, and the second mounting part (112) being suspended above the sewing sliding platform.

7. The positioning and sewing structure for the main label at the waistband according to claim 6, characterized in that, The presser foot movable component (12) includes: a drive rod (121), a movable plate (122), and a fastener (123). The drive rod (121) is installed on the first mounting part (111) and the second mounting part (112). The second mounting part (112) is provided with a sliding groove. The movable plate (122) is provided with a mounting hole. The fastener (123) passes through the mounting hole and the sliding groove to connect, so that the movable plate (122) is slidably installed on the second mounting part (112). The output end of the drive rod (121) is connected to the movable plate (122). The motor drives the drive rod (121) to move the movable plate (122) downward.

8. The positioning and sewing structure for the main label at the waistband according to claim 7, characterized in that, The pressure plate mounting part (13) includes at least one mounting piece (131), one end of which is detachably mounted to the movable plate (122), and the upper pressure plate (2) is detachably mounted to the end of the mounting piece (131) away from the movable plate (122).

9. The positioning and sewing structure for the main label at the waistband according to claim 8, characterized in that, The number of mounting pieces (131) is two, and the two mounting pieces (131) are spaced apart and arranged horizontally.

10. The positioning and sewing structure for the main label at the waistband according to claim 9, characterized in that, The upper pressure plate (2) and the lower plate (3) are visible panels. The lower plate (3) is provided with a first metal sheet (33), and the upper pressure plate (2) is provided with a second metal sheet (23). The first metal sheet (33) and the second metal sheet (23) are connected to the end of the lower plate (3) near the first mounting part (111), and the second metal sheet (23) is connected to the upper plate surface of the upper pressure plate (2). The first mounting part (111) is connected to the first metal sheet (33), and the pressure plate mounting part (13) is connected to the second metal sheet (23).

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