Sewing method for zipper chain, and garment and flexible bag having zipper chain

Abstract

The present application relates to the field of zipper chains. Disclosed are a sewing method for a zipper chain, and a garment and flexible bag having a zipper chain. In the sewing method for a zipper chain, the zipper chain comprises zipper teeth and a core thread, and is provided with a traction section, a pre-sewing section and a sewing section in sequence. The sewing method comprises: passing the traction section through a sewing station, and locating the pre-sewing section at the sewing station; overlapping the sewing section on the edge of a fabric, and aligning the sewing section with the edge; in front of the sewing station, applying an initial traction force to the traction section to pull the zipper chain forward, and sewing the zipper teeth and the core thread in the pre-sewing section during the passage of the pre-sewing section through the sewing station; in front of the sewing station, continuously applying a traction force to the zipper chain until the sewing section passes through the sewing station, and during the passage of the sewing section through the sewing station, keeping the sewing section and the fabric advancing synchronously in an extension direction; and sewing the sewing section to the edge of the fabric during the passage of the sewing section and the fabric through the sewing station.

Description

Sewing methods for chain teeth, garments with chain teeth, and flexible bags.

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510697475.9, filed on May 27, 2025, entitled "Method for sewing chain teeth, garment with chain teeth and flexible bag"; Chinese Patent Application No. 202510278955.1, filed on March 10, 2025, entitled "Method for sewing chain teeth and garment with chain teeth"; and Chinese Patent Application No. 202422572476.4, filed on October 24, 2024, entitled "Chain belt sewing device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the technical field of chain teeth, specifically relating to a method for sewing chain teeth, a garment with chain teeth, and a flexible bag with chain teeth. Background Technology

[0004] Currently, there are various zipper tooth structures, among which the more common ones include a core thread and teeth formed by monofilaments of materials such as nylon wrapped around the core thread. In the production of some garments or flexible bags with zipper teeth, these teeth need to be sewn onto the fabric. If traditional methods are used for direct sewing, the teeth sewn onto the fabric may deform in the direction of their extension during the sewing process, resulting in inconsistent spacing between the tooth units (i.e., tooth pitch), which affects the normal opening and closing of the zipper.

[0005] To address this issue, a two-step sewing method has been proposed: first, the chain teeth are sewn together with the core thread using thread, and then the chain teeth are sewn onto the fabric as a whole using thread.

[0006] However, although the above sewing method can ensure that the tooth spacing of the chain stitches on the fabric is consistent, the above sewing method requires two separate sewing processes, which makes the sewing steps complicated and cumbersome, reducing the production efficiency of clothing or flexible bags. Summary of the Invention

[0007] The purpose of this application is to provide a method for sewing chain teeth, a garment with chain teeth, and a flexible bag with chain teeth, which can solve the problems of complex and cumbersome sewing methods in related technologies.

[0008] To solve the above-mentioned technical problems, this application is implemented as follows:

[0009] This application provides a method for sewing chain teeth, wherein the chain teeth include chain teeth and core thread, and are sequentially provided with a traction section, a pre-sewing section and a sewing section along their extension direction; the method includes:

[0010] The traction section passes through the sewing station of the sewing equipment, and the pre-sewn section is positioned at the sewing station;

[0011] Overlap the sewn section onto the edge of the fabric and align the sewn section with the edge of the fabric;

[0012] An initial traction force is applied to the traction section in front of the sewing station to pull the entire chain tooth along the extension direction, and the chain teeth and core thread in the pre-sewn section are sewn as the pre-sewn section passes through the sewing station. The traction force is continuously applied to the chain tooth in front of the sewing station until the sewn section passes through the sewing station, and the sewn section and the fabric are kept moving synchronously along the extension direction as the sewn section passes through the sewing station.

[0013] As the sewing section and the fabric pass through the sewing station, the sewing section is sewn to the edge of the fabric.

[0014] This application also provides a garment with chain teeth, including fabric and chain teeth;

[0015] The chain teeth are sewn to the edge of the fabric using the above-described sewing method.

[0016] This application embodiment also provides a flexible bag with chain teeth, including fabric and chain teeth;

[0017] The chain teeth are sewn to the edge of the fabric using the above-described sewing method.

[0018] This application employs a one-step sewing method, directly sewing the chain teeth to the edge of the fabric. Compared to the two-step sewing method used in related technologies, this application reduces the step of first sewing the chain teeth and core thread together, thereby reducing the complexity of the sewing process, simplifying the sewing steps, shortening the sewing time, and improving sewing efficiency. Furthermore, during the sewing process, the pre-sewn section is sewn first to ensure it can withstand the traction force from the traction section. This prevents the traction force from directly acting on the sewn section, ensuring that the chain tooth spacing within the sewn section remains constant during traction. This effectively prevents inconsistent chain tooth spacing within the sewn section area from affecting the normal use of subsequent chain teeth. Additionally, during the sewing of the sewn section, ensuring that the sewn section moves synchronously with the fabric prevents wrinkles caused by asynchronous movement of the chain teeth and fabric during sewing, ensuring the normal sewing of the chain teeth.

[0019] To adapt to the requirements of new sewing technologies and improve the sewing efficiency and quality of chain links and fabric, this invention proposes a chain link sewing device, including a frame and a sewing head mounted on the frame. The sewing head includes a reciprocating needle for guiding the sewing thread. It also includes a chain link traction device, a chain link guiding device, and a fabric conveying device. The chain link guiding device includes a chain link guide groove and a cover plate mounted on the groove. The cover plate is movable up and down. The guide groove guides the chain link forward, and the cover plate has clearance holes for the needle to pass through. The chain link traction device is located at the rear of the sewing head and includes a first drive motor for pulling the chain links arranged in a strip from front to back, allowing them to pass through the guide groove. The fabric conveying device includes a second drive motor and a clamping plate for holding the fabric. The second drive motor drives the clamping plate to move from front to back, thus conveying the fabric to the sewing head. The fabric has a sewn section. When the clamping plate carries the fabric forward, the sewn section passes under the cover plate through the clearance hole, allowing the sewing needle to pass through the sewn section during its downward insertion action. The system also includes a controller and a needle sensor. The needle sensor, a first drive motor, and a second drive motor are signal-connected to the controller. The needle sensor detects the lifting action of the needle and sends a needle lifting action signal to the controller. Upon receiving the needle lifting action signal, the controller controls the first and second drive motors to synchronously complete a predetermined rotation step, then pauses to wait for the needle to complete its downward insertion action. While the first and second drive motors synchronously complete the predetermined step, the chain teeth and the fabric also synchronously move backward by a predetermined pitch. The predetermined step is equal to the predetermined pitch, and the ratio of the predetermined pitch to the pitch of the chain teeth is N, where N is a natural number greater than or equal to 1. The needle, driven by the sewing motor, performs a downward insertion action, guiding the thread to complete the sewing between the chain teeth and the fabric.

[0020] The sewing head is a device used to sew the chain teeth to the fabric. It includes a sewing motor and a needle mounting post. The needle is detachably mounted on the bottom of the needle mounting post. Driven by the sewing motor, the needle mounting post can perform continuous reciprocating motion, thereby carrying the needle in a reciprocating motion. The sewing motor drives the reciprocating motion of the needle mounting post, but the sewing motor is an independently controlled motor and does not necessarily have a synchronous action relationship with the first drive motor and the second drive motor mentioned below. However, the sewing motor starts before the first drive motor and the second drive motor.

[0021] The guide groove includes a bottom wall and two side walls. The bottom wall and the side walls define a cavity. The chain tooth moves through the cavity and along its extension direction. The depth of the cavity is not less than half the height of the chain tooth. To better define the chain tooth, the upper surface of the side wall is generally set slightly higher than the chain tooth. This allows the fabric to be positioned above the chain tooth when it passes through the fabric gap and extends under the cover plate.

[0022] The cover plate is a component movably arranged above the guide groove opening to limit the chain teeth and prevent them from dislodging from the guide groove during movement. The cover plate is also provided with a connecting rod, the upper end of which is movably connected to the sewing machine head. When placing the chain teeth, the cover plate is lifted upward to facilitate the placement of the chain teeth, and then the cover plate is pressed down to allow it to fall above the guide groove opening. A fabric passage gap is left between the cover plate and the chain tooth guide groove, and the sewing part can extend under the cover plate through the fabric passage gap.

[0023] The chain tooth traction device is a mechanism used to traction the chain tooth to move. The chain tooth is generally a long, continuous strip structure. The chain tooth traction device can continuously pull the chain tooth. The chain tooth traction device includes a first drive motor, a traction wheel, and a pressure wheel. The traction wheel is driven by the first drive motor. An annular groove for placing the chain tooth is provided on the outer peripheral wall of the traction wheel. The pressure wheel rotatably presses against the outer peripheral wall of the traction wheel and covers part of the annular groove. The first drive motor can drive the traction wheel to rotate, and the traction wheel then pulls the chain tooth placed in the annular groove to move.

[0024] The fabric conveying device is a mechanism for feeding fabric to the sewing machine head. The fabric is a pre-cut sheet material, with each piece independent and without continuity. The fabric has a sewing section for connection with chain stitches. The fabric conveying device includes clamping plates for holding the fabric. After the fabric is clamped by the clamping plates, the sewing section of the fabric is generally exposed on the outer edge of the clamping plates. The fabric conveying device also includes a guide rail and a bracket. The guide rail is fixedly connected to the machine frame, and the bracket is slidably connected to the guide rail. A second drive motor is driven and connected to the bracket. The clamping plates are connected to the bracket. Driven by the second drive motor, the bracket can move back and forth along the guide rail with the clamping plates. Furthermore, the clamping plates are detachably connected to the bracket, allowing for the installation and replacement of multiple clamping plates to improve processing efficiency.

[0025] The controller is a control component that can receive sensor signals and simultaneously control the first drive motor and the second drive motor. Of course, the stitching motor can also be connected to the controller to achieve unified control.

[0026] The needle sensor is used to detect the movement of the needle. To facilitate the detection of the needle's movement, the needle sensor is located on the side of the needle mounting post to detect the vertical movement of the needle mounting post. When the needle mounting post passes the needle sensor from bottom to top, the needle sensor is triggered and sends a needle-lifting signal to the controller. Similarly, when the needle mounting post passes the needle sensor from top to bottom, the needle sensor can also be triggered to send a needle-pressing signal to the controller. Furthermore, a trigger can be provided on the needle mounting post, which can move up and down with the trigger. When the trigger approaches the needle sensor, the needle sensor is triggered and sends a needle-lifting signal or a needle-pressing signal to the controller.

[0027] The predetermined step length refers to the circumference length of a point on the outer circumference of the roller driven by the first drive motor and the second drive motor within one rotation cycle. Of course, the roller is also the component that drives the chain teeth or clamps to move. The predetermined pitch refers to the stroke of the chain teeth and fabric moving from front to back within one rotation cycle of the first drive motor and the second drive motor. Therefore, the predetermined step length and the predetermined pitch are equal.

[0028] Specifically, when the first drive motor and the second drive motor synchronously complete the predetermined step length, the chain teeth and the fabric also synchronously move backward by a predetermined pitch. This has at least the following implications: First, the predetermined step length generated by the motor rotation is related to the predetermined pitch of movement of the chain teeth and the fabric; the motor rotation ultimately aims to drive the chain teeth and the fabric to move. Second, the synchronous completion of the predetermined step length by the first drive motor and the second drive motor means that the two motors rotate the rollers they drive by the same predetermined step length within the same time period, i.e., the rollers rotate at the same speed. Third, the synchronous backward movement of the chain teeth and the fabric by a predetermined pitch means that the chain teeth and the fabric not only move backward together, but also move by a predetermined pitch within the same time period, i.e., their movement speeds are also the same.

[0029] Under the control of the controller, the first and second drive motors perform intermittent start-stop actions. This is because the sewing needle's sewing action includes lifting above the fabric and moving downwards through the zipper teeth and fabric. If the needle pulls on the zipper teeth and fabric while moving downwards through them, it will damage the needle. Therefore, when the needle is lifted above the fabric, the first and second drive motors need to be controlled to rotate to pull the zipper teeth and fabric forward. If the zipper teeth and fabric move backwards together by a predetermined pitch L1, and the zipper tooth pitch is L0, then L1:L0 = N, where N is a positive integer greater than or equal to 1.

[0030] The chain teeth and fabric move backward synchronously by a predetermined pitch by controlling the first drive motor and the second drive motor to rotate synchronously by a predetermined step length. The means of controlling the motor rotation include at least the following three methods:

[0031] In the first method, after receiving the needle lifting action signal, the controller controls the first drive motor and the second drive motor to rotate synchronously for a predetermined time T to control the predetermined step size of the rotation. After the predetermined time T, the controller controls the first drive motor and the second drive motor to pause synchronously and wait for the needle to complete the downward insertion action.

[0032] In the second method, after receiving the needle lifting action signal, the controller controls the first drive motor and the second drive motor to rotate synchronously. The needle sensor can also sense the needle pressing down and send a needle pressing signal to the controller. After receiving the needle pressing signal, the controller controls the first drive motor and the second drive motor to pause rotating synchronously to wait for the needle to complete the downward insertion action. That is, the controller controls the first drive motor and the second drive motor to rotate synchronously by a predetermined step size through the sensing signal of the needle sensor.

[0033] The third type is where the first and second drive motors are servo motors, and the controller includes a pulse signal generator. After receiving the needle lifting action signal, the controller sends a predetermined number of pulse signals to the first and second drive motors through the pulse signal generator to control the first and second drive motors to rotate synchronously by an angle and a number of revolutions. Then, the controller stops sending pulse signals to control the first and second drive motors to pause synchronously and wait for the needle to complete the downward insertion action.

[0034] According to the above technical solution, compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0035] First, by setting up the fabric conveying device and the chain tooth traction device, and using the controller to control the first drive motor and the second drive motor to rotate and stop synchronously, the fabric and chain teeth can move synchronously from front to back to convey materials to the sewing machine head. This not only provides stable synchronous feeding, but also realizes the automation and intelligence of feeding, greatly improving processing efficiency.

[0036] Secondly, by setting the clamping plate to clamp the fabric, the fabric can be effectively clamped and fixed, and the sewn parts of the fabric can also be well unfolded and tensioned. Then, the fabric is transported by the automatically controlled second drive motor, which allows the fabric and the chain teeth to move synchronously. Compared with the prior art, the feeding speed of the present invention is stable, which effectively solves the problems of deviation, inconsistent speed and tension when feeding manually, and greatly improves the aesthetics of the sewing between the chain teeth and the fabric.

[0037] Third, by setting a needle sensor, the lifting or pressing action of the needle is converted into a signal and sent to the controller, so that the controller can accurately obtain the position status of the needle and perform regular start and stop control on the first drive motor and the second drive motor. This not only avoids interference between the needle and the chain teeth and the fabric, but also protects the sewing equipment well.

[0038] Fourth, the controller controls the first drive motor and the second drive motor to complete a predetermined step length synchronously, thereby controlling the predetermined pitch of the synchronous movement of the chain teeth and the fabric. This not only allows the equipment to adapt to different specifications of chain teeth by setting the predetermined step length of the motor, thus improving the versatility of the equipment, but also allows for different span sewing techniques by adjusting the predetermined pitch of the synchronous movement of the chain teeth and the fabric.

[0039] Because of the above-mentioned features and advantages, this invention can be applied to chain sewing equipment. Attached Figure Description

[0040] Figure 1 is a flowchart of the chain tooth sewing method disclosed in the embodiments of this application;

[0041] Figure 2 is a schematic diagram of the chain teeth sewn onto the fabric according to an embodiment of this application;

[0042] Figure 3 is a cross-sectional view of the chain teeth sewn onto the fabric according to an embodiment of this application;

[0043] Figure 4 is a partial schematic diagram of the chain stitching device, fabric and chain teeth disclosed in the embodiments of this application;

[0044] Figure 5 is a schematic diagram of the flexible package disclosed in the embodiments of this application;

[0045] Figure 6 is a schematic diagram of the axial side structure of the chain stitching device;

[0046] Figure 7 is a magnified view of the structure at point M in Figure 6;

[0047] Figure 8 is a schematic diagram of the axial structure of the chain sewing equipment, showing the hidden parts of the frame and fabric conveying device.

[0048] Figure 9 is a magnified view of the structure at point K in Figure 8;

[0049] Figure 10 is a magnified view of the structure at point L in Figure 9;

[0050] Figure 11 is a schematic diagram of the axial structure of the clamping plate;

[0051] Figure 12 is an exploded structural diagram of the chain tooth guiding device;

[0052] Figure 13 is a schematic diagram of the first structure of the needle sensor;

[0053] Figure 14 is a schematic diagram of the second structure of the needle sensor.

[0054] Explanation of reference numerals in the attached diagram: A10 - Fabric; A10a - Bag body; A20 - Core thread; A30 - Sewing thread; A40 - Chain teeth; A41 - Traction section; A42 - Pre-sewing section; A43 - Sewing section; AM - Sewing station; AN - Traction station. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0057] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0058] Referring to Figures 1 to 5, this application discloses a sewing method for a zipper tooth A40, used to sew the zipper tooth A40 to the edge of the fabric, so that it can be opened or closed by the subsequent engagement of a zipper pull with the zipper tooth A40. The fabric A10 can be clothing fabric, such as shirt fabric, trouser fabric, skirt fabric, etc.; or, the fabric A10 can be flexible bag fabric, such as backpack fabric, travel bag fabric, sports bag fabric, decorative bag fabric, etc. As shown in Figure 5, the fabric A10 can form the bag body A10a of the flexible bag, and the zipper tooth A40 is fixed to the edge of the fabric A10 at the opening of the bag body A10a to facilitate the opening and closing of the bag body A10a.

[0059] Optionally, the chain tooth A40 may include chain teeth and core wire A20, with the chain teeth wrapped around the core wire A20 to form a plurality of chain tooth units spaced apart along the extension direction of the core wire A20.

[0060] To achieve the traction and sewing of the chain tooth A40, the chain tooth A40 can be provided with a traction section A41, a pre-sewing section A42, and a sewing section A43, which are arranged sequentially along the extension direction of the chain tooth A40. The traction section A41 is used to withstand the initial traction force from the force-applying device (e.g., the chain tooth traction device described below), so that the entire chain tooth A40 can move along a predetermined direction (e.g., the extension direction of the chain tooth A40) under the action of the initial traction force. The purpose of setting the pre-sewing section A42 is to create a deformation buffer zone in front of the sewing section A43, so that the deformation caused by the traction force is withstood by the pre-sewing section A42, ensuring that the chain tooth units within the sewing section A43 area do not experience changes in tooth pitch due to traction. The sewing section A43 is the part sewn to the fabric A10, and after the chain tooth A40 is sewn to the edge of the fabric A10, it lays the foundation for the subsequent installation of the zipper pull.

[0061] In this embodiment, a set of sewing equipment can be used to realize the processes of pulling the chain tooth A40, feeding the fabric, and sewing the chain tooth A40 onto the fabric, thereby realizing integrated control of chain tooth A40 pulling, fabric feeding and sewing, which is beneficial to simplifying the control logic and facilitating precise control of each step.

[0062] Optionally, the sewing equipment may include a chain tooth traction device, a fabric conveying device, and a sewing head. The chain tooth traction device applies traction to the chain tooth A40, enabling it to travel along its extension direction. The fabric conveying device conveys the fabric and works in conjunction with the chain tooth traction device to achieve synchronous conveying of the chain tooth A40 and the fabric. The sewing head sews the chain tooth A40 onto the fabric.

[0063] Based on the above, the suturing method in this application embodiment includes:

[0064] S01. Pass the traction section A41 through the sewing station AM of the sewing equipment and position the pre-sewn section A42 at the sewing station AM.

[0065] Optionally, the traction segment A41 can be manually passed through the sewing station AM and connected to the chain tooth traction device, so that the traction segment A41 can be tractioned by the chain tooth traction device to move the entire chain tooth A40 forward. Exemplarily, the chain tooth traction device may include a traction wheel and a pressure wheel, the space between the traction wheel and the pressure wheel being able to pass through the chain tooth A40, so that the traction wheel can drive the chain tooth A40 forward.

[0066] In actual working conditions, the sewing station AM can be located directly below the needle of the sewing machine head, so that sewing can be performed at the sewing station by moving the needle up and down. Based on this, the pre-sewn section A42 in the embodiment of this application can be located above the sewing station AM and below the needle, so that the pre-sewn section A42 can be sewn by moving the needle up and down.

[0067] It should be noted that during the up-and-down movement of the needle, suture A30 can be sewn onto the chain teeth and core thread A20 within the pre-sewn section A42. This helps to fix the chain teeth and core thread A20 within the pre-sewn section A42, improving the stability of the chain tooth unit formed by each chain tooth and core thread A20. Consequently, the pre-sewn section A42 is less prone to changes in tooth pitch after being pulled. Optionally, suture A30 can be used to bind the chain tooth unit, or to bind or pierce the core thread A20.

[0068] S02. Place the pre-sewn section A42 over the edge of the fabric A10 and align the sewn section A43 with the edge of the fabric A10.

[0069] Considering that the function of a zipper is to join two pieces of fabric A10 together by pulling them together or to separate them by pulling them apart, the zipper teeth A40 can be positioned at the edge of fabric A10. When placing the zipper teeth A40 on fabric A10, the sewn section A43 overlaps the edge surface of fabric A10, with the zipper teeth A40 positioned on the upper or lower surface of the edge of fabric A10. Furthermore, the sewn section A43 needs to be aligned with the edge of fabric A10 to avoid the zipper teeth A40 protruding from the edge of fabric A10, resulting in an insecure stitch, or the edge of fabric A10 protruding from the zipper teeth A40, causing the zipper pull to easily get stuck during subsequent use. Additionally, aligning the sewn section A43 with the edge of fabric A10 also helps improve the appearance of the garment or flexible bag.

[0070] S03. Apply initial traction force to the traction section A41 in front of the sewing station AM to pull the entire chain tooth A40 along its own extension direction, and sew the chain teeth and core thread A20 in the pre-sewing section A42 as it passes through the sewing station AM.

[0071] Optionally, the chain tooth traction device in the aforementioned sewing equipment can be used to apply an initial traction force to the traction section A41 to pull the entire chain tooth A40 forward. As the chain tooth A40 moves forward, the pre-sewn section A42 gradually passes the sewing station AM. Simultaneously, the sewing machine head sews the pre-sewn section A42, locking the chain teeth and core thread A20 within the pre-sewn section A42 area through the sewing thread A30. This prevents the chain teeth within the pre-sewn section A42 area from moving relative to each other, thus ensuring that the chain tooth pitch in the pre-sewn section A42 remains constant. It should be noted that as the sewing machine head sews the pre-sewn section A42, allowing it to follow the traction section A41, the core thread A20 within the pre-sewn section A42 can bear the traction force, ensuring that the chain tooth pitch within the pre-sewn section A42 area does not change, thus guaranteeing that the chain tooth pitch remains constant.

[0072] S04. Continuously apply traction force to the chain tooth A40 in front of the sewing station AM until the sewing section A43 passes through the sewing station AM, and keep the sewing section A43 and the fabric A10 moving synchronously along the extension direction of the chain tooth A40 during the process of the sewing section A43 passing through the sewing station AM.

[0073] Specifically, during the conveying of the chain tooth A40 and the fabric, the sewing section A43 and the fabric can be controlled to move synchronously in the sewing station AM area so that there is no relative movement between the chain tooth A40 and the fabric, thereby ensuring that the chain tooth A40 and the fabric do not wrinkle, so as to facilitate good sewing of the chain tooth A40 and the fabric.

[0074] Optionally, the chain tooth traction device and the fabric conveying device in the above-mentioned sewing equipment can be controlled separately so that their respective drive motors can rotate synchronously by a predetermined step length, thereby ensuring that the chain tooth A40 and the fabric can move synchronously.

[0075] S05. During the process of sewing section A43 and fabric A10 passing through sewing station AM, sewing section A43 is sewn to the edge of fabric A10.

[0076] Specifically, when the sewing section A43 and the fabric travel to the sewing station AM and are in contact with the sewing needle of the sewing machine head, the sewing section A43 and the fabric can be sewn. After the sewing is completed, when the sewing section A43 is subjected to traction, the chain tooth units in the area of ​​the sewing section A43 will not move relative to each other, thereby ensuring that the chain tooth pitch in the sewing section A43 remains fixed.

[0077] Based on the above steps, this embodiment of the application adopts a one-step sewing method, directly sewing the chain teeth A40 to the edge of the fabric. Compared with the two-step sewing method in related technologies, this embodiment of the application reduces the step of first sewing the chain teeth A40 and the core thread A20 together, thereby reducing the complexity of the sewing steps, making the sewing process less cumbersome, shortening the sewing time, and improving sewing efficiency. In addition, during the sewing process, the pre-sewn section A42 can be sewn so that the pre-sewn section A42 can withstand the traction force from the traction section A41, thereby preventing the traction force from directly acting on the sewn section A43. This ensures that the spacing of the chain teeth in the sewn section A43 remains constant during the traction process, effectively preventing inconsistent chain tooth spacing from affecting the normal use of the subsequent chain teeth A40. Furthermore, during the sewing process of the sewn section A43, it is ensured that the sewn section A43 and the fabric A10 move synchronously, thereby preventing wrinkles caused by asynchronous movement of the chain teeth A40 and the fabric A10 during the sewing process, ensuring the normal sewing of the chain teeth A40.

[0078] In some embodiments, maintaining the synchronous movement of the sewing segment A43 and the fabric A10 along the extension direction during the process of the sewing segment A43 passing through the sewing station AM includes:

[0079] During the process of fabric A10 and sewing section A43 passing through sewing station AM, fabric A10 and chain teeth A40 are controlled to move synchronously or stop intermittently along the extension direction of chain teeth A40.

[0080] Specifically, after fabric A10 and sewing section A43 have traveled a certain distance, they stop, and then the sewing needle of the sewing machine head pierces fabric A10 and sewing section A43; then, fabric A10 and sewing section A43 travel a certain distance again, and the sewing needle of the sewing machine head pierces fabric A10 and sewing section A43 again; and so on, until sewing section A43 and fabric A10 are sewn together.

[0081] It should be noted here that, as the needle pierces the sewing section A43 and the fabric A10 in the up-down direction, the chain teeth A40 and the fabric A10 need to stop moving while the needle is piercing the sewing section A43 and the fabric A10. This is to prevent interference caused by the movement direction of the needle being inconsistent with the movement direction of the chain teeth A40 and the fabric A10, so as to avoid the needle bending or breaking.

[0082] Furthermore, the fabric A10 conveying device and the chain tooth traction device can be controlled to achieve intermittent synchronous movement or stopping of the fabric A10 and the chain tooth traction device. Optionally, the controller can control the respective drive motors of the fabric conveying device and the chain tooth traction device separately, so that the drive motors of both can rotate synchronously by a preset step length. In addition, the controller can also control the drive motor of the sewing machine head to adapt the movement of the sewing machine head to the movement of the fabric A10 conveying device and the chain tooth traction device.

[0083] In some embodiments, the fabric A10 and the chain tooth A40 move a predetermined pitch in each intermittently synchronized cycle, the ratio of the predetermined pitch to the chain tooth pitch of the chain tooth A40 can be N, where N is a natural number greater than or equal to 1.

[0084] For example, the chain tooth A40 and the fabric can move synchronously by a predetermined pitch L1, where the chain tooth pitch of the chain tooth A40 is L0, and L1:L0 = N, where N is a natural number (or a positive integer) greater than or equal to 1. Precise stitching of one chain tooth pitch can be achieved using the sewing needle of the sewing device, or stitching of different widths can be achieved across multiple chain tooth pitches.

[0085] Optionally, the controller can control the drive motors of the fabric A10 conveying device and the chain tooth traction device to synchronously complete a predetermined step length, thereby controlling the predetermined pitch of the synchronous movement of the fabric A10 and the chain tooth A40. This not only allows for the adaptation to different specifications of chain teeth A40 by setting the predetermined step length of the drive motor, improving the versatility of the equipment, but also allows for the adjustment of the predetermined pitch of the synchronous movement of the chain tooth A40 and the fabric A10, enabling different width sewing techniques.

[0086] In some embodiments, before the fabric A10 enters the sewing station AM, the fabric A10 is controlled to be conveyed to the sewing station AM at a first speed. After the fabric A10 enters the sewing station AM, the fabric A10 is controlled to travel intermittently through the sewing station AM at a second speed, and the second speed is less than the first speed.

[0087] Specifically, before fabric A10 enters sewing station AM, fabric A10 can be conveyed quickly, that is, conveyed at a first speed to increase the conveying speed of fabric A10; after fabric A10 arrives at sewing station AM, fabric A10 and chain teeth A40 are controlled to move synchronously at a smaller second speed to adapt to the movement of the sewing needle, thereby meeting the sewing requirements.

[0088] The embodiments of this application employ the above-described motion pattern, which can shorten the transmission time of fabric A10 before sewing, thereby improving sewing efficiency.

[0089] In some embodiments, fabric A10 is kept taut during the conveying process. This ensures that fabric A10 does not wrinkle or loosen during conveying, guaranteeing smooth conveying of fabric A10. Furthermore, it ensures the flatness of fabric A10 during the sewing process at sewing station AM, improving the sewing effect.

[0090] Optionally, the fabric A10 conveying device may include a bracket and a clamping plate. The clamping plate is used to clamp and tension the fabric A10 to prevent the fabric A10 from wrinkling or loosening. The bracket is used to install the clamping plate. The bracket can drive the clamping plate to move under the drive of the drive motor, thereby driving the fabric A10 it clamps to move forward.

[0091] In some embodiments, the edge of fabric A10 can be folded before sewing fabric A10 and chain tooth A40. The presence of the fold increases the strength and stiffness of the edge of fabric A10, preventing it from sagging. Furthermore, chain tooth A40 can be sewn into the area where the fold of fabric A10 is located; sewing chain tooth A40 after this process improves the stability and reliability of its installation.

[0092] Optionally, the edges of fabric A10 can be folded manually; alternatively, a folding mechanism can be installed between the fabric A10 conveying device and the sewing station AM to fold the edges of fabric A10. For example, the folding mechanism may include a folding plate and a folding motor. The folding motor drives the folding plate to rotate 180°, thereby folding the edges of fabric A10 180° to form a fold.

[0093] In some embodiments, a traction station AN may be provided in front of the sewing station AM, and the chain tooth traction device may be provided at the traction station AN. Continuously applying traction force to the chain tooth A40 in front of the sewing station AM until the sewing segment A43 passes through the sewing station AM includes:

[0094] Apply traction force sequentially to the portion of chain tooth A40 that passes through traction station AN until sewing section A43 passes through sewing station AM.

[0095] Specifically, after passing through the sewing station AM, the traction section A41 can enter the traction station AN. At the traction station AN, the traction section A41 is pulled forward by the chain tooth traction device, causing the chain tooth A40 to move forward. As the chain tooth A40 moves forward, the pre-sewn section A42, which has been sewn at the sewing station AM, gradually enters the traction station AN. At the traction station AN, the pre-sewn section A42 is pulled forward by the chain tooth traction device, causing the chain tooth A40 to continue moving forward. As the chain tooth A40 continues to move forward, the pre-sewn section A42 gradually leaves the traction station AN, and the sewn section A43, which has been sewn at the sewing station AM, gradually enters the traction station AN. The sewn section A43 is pulled forward at the traction station AN by the chain tooth traction device until the sewing section A43 is completed and has completely passed through the sewing station AM.

[0096] Based on the above process, the embodiments of this application can sequentially pull the traction section A41, pre-sewing section A42 and sewing section A43 of the chain tooth A40 to ensure that the chain tooth A40 moves forward steadily, thereby realizing the sewing of the pre-sewing section A42 and the sewing of the sewing section A43 respectively.

[0097] In some embodiments, after sewing the sewing section A43 to the edge of the fabric A10, the sewing method may further include cutting off the traction section A41 and the pre-sewing section A42. It should be noted that during the passage of the traction section A41 through the sewing station AM and the pre-sewing section A42 through the sewing station AM, the fabric A10 does not enter the sewing station AM. However, when the sewing section A43 enters the sewing station AM, the fabric A10 and the sewing section A43 simultaneously enter the sewing station AM, and the sewing section A43 and the fabric A10 are sewn together.

[0098] Therefore, it is evident that the traction section A41 and the pre-sewn section A42 will not be sewn to the fabric A10; only the sewing section A43 will be sewn to the fabric A10. To prevent the traction section A41 and the pre-sewn section A42 from adversely affecting the appearance of the finished garment or flexible bag, they can be cut off after the sewing section A43 is sewn to the fabric A10, leaving only the sewing section A43. In this way, the chain teeth A40 can cover the entire edge of the fabric A10 without affecting the appearance of the garment or flexible bag.

[0099] Optionally, the sewing equipment may also include a cutting device, which may be located in front of the sewing station AM to cut off the traction section A41 and pre-sewn section A42 located outside the fabric A10 after sewing. For example, the cutting device may include scissors.

[0100] In some embodiments, sewing the sewing segment A43 to the edge of the fabric A10 includes: sewing the chain teeth and core thread A20 within the sewing segment A43 area together to the edge of the fabric A10. Based on this, the installation stability of the chain teeth and core thread A20 within the sewing segment A43 area can be guaranteed, preventing the chain teeth and core thread A20 from moving arbitrarily.

[0101] Optionally, the thread A30 may be wrapped around the chain teeth and core thread A20 in the sewn section A43 area and pierce the edge of the fabric A10 to bind the chain teeth and core thread A20 in the sewn section A43 area to the edge of the fabric A10 by means of the thread A30.

[0102] Of course, the thread A30 can also be wrapped around the chain teeth in the sewing section A43 area and pierce the edge of the core thread A20 and the fabric A10, so as to bind the chain teeth in the sewing section A43 area to the edge of the fabric A10 by means of the thread A30, and to lock the core thread A20 in the sewing section A43 area to the edge of the fabric A10 by means of piercing.

[0103] Based on the above-described sewing method for the chain tooth A40, this application also discloses a garment having the chain tooth A40. The disclosed garment includes fabric A10 and chain tooth A40; wherein, the chain tooth A40 is sewn to fabric A10 using the above-described sewing method. It should be noted that the steps for sewing the chain tooth A40 to the edge of fabric A10 can refer to the above-described sewing method, and will not be repeated here.

[0104] Based on the above-described sewing method for the chain tooth A40, this application also discloses a flexible bag having the chain tooth A40. The disclosed flexible bag includes fabric A10 and chain tooth A40; wherein, the chain tooth A40 is sewn to fabric A10 using the above-described sewing method. It should be noted that the steps for sewing the chain tooth A40 to the edge of fabric A10 can refer to the above-described sewing method, and will not be repeated here.

[0105] Currently, most commercially available zipper tapes are formed by sewing strips of fabric together with zipper teeth. Traditional zipper tapes, for ease of processing, typically have lengths of several meters or even over a hundred meters for both the fabric and zipper teeth. A sewing machine continuously sews these long strips together and then cuts them to the required length. For example, Chinese invention patent CN114808285A discloses a zipper sewing machine, which includes a frame and a fixed base. It also includes a fabric storage unit connected to the fixed base, a zipper storage unit connected to the frame, and a sewing section. The fabric and zipper tape on the fabric storage unit pass through the sewing section. The sewing section has two sewing pieces to simultaneously sew both sides of the zipper. It also includes a fabric winding unit and a second drive unit. The second drive unit drives the fabric winding unit to rotate and retract the sewn fabric roll. Finally, it includes a tensioning unit, which includes a cam-shaped first tensioning block and a second tensioning block to tension the fabric tape.

[0106] However, with advancements in manufacturing technology, the idea arose to directly sew the zipper teeth onto the fabric sheet to reduce the thickness of the garment or fabric at the zipper joint. However, existing zipper sewing machines are only suitable for sewing long strips of zipper tape and are not applicable to fabric sheets of varying sizes. These sheets must be sewn manually, piece by piece, which presents several problems, such as slow processing efficiency, inconsistent feeding speed, and the risk of incomplete sewing or wrinkling. Therefore, it is necessary to develop new sewing equipment to solve these problems.

[0107] The structure of the chain stitching device applying the technical solution of the present invention will be further described below with reference to the accompanying drawings. Except where explicitly stated that they are equivalent or alternative embodiments, the various implementation details disclosed below may be selectively applied or combined in a single embodiment even if they are not directly related or synergistic in function.

[0108] As shown in Figures 6-12, a chain sewing device includes a frame 100 and a sewing head 2 mounted on the frame 100. The frame 100 has a worktable. The sewing head 2 includes a needle 22 capable of continuous reciprocating motion, used to guide the sewing thread. The device also includes a chain tooth traction device 3, a chain tooth guiding device 4, and a fabric conveying device 5. The chain tooth guiding device 4 includes a chain tooth guiding groove 41 and a cover plate 42 mounted on the groove. The cover plate 42 is movable up and down. The chain tooth guiding groove 41 guides the chain teeth 11 within it. Moving forward, the cover plate 42 is provided with a clearance hole 421 to allow the sewing needle 22 to pass through; the chain tooth traction device 3 is located on the rear side of the sewing machine head 2, and the chain tooth traction device 3 includes a first drive motor 31, which is used to pull the chain teeth 11 arranged in a strip shape to move from front to back, so that the chain teeth 11 move through the chain tooth guide groove 41; the fabric conveying device 5 includes a second drive motor 51 and a clamping plate 52, which is used to clamp the fabric 12, and the second drive motor 51 can drive the clamping plate 52 to move from front to back, thereby conveying the fabric 12 to the sewing machine head 2. The fabric 12 has a sewn part 121. When the clamp 52 carries the fabric 12 forward, the sewn part 121 passes under the cover plate 42 through the clearance hole 421, allowing the sewing needle 22 to pass through the sewn part 121 during the downward insertion action. The system also includes a controller 6 and a sewing needle sensor 23. The sewing needle sensor 23, the first drive motor 31, and the second drive motor 51 are signal-connected to the controller 6. The sewing needle sensor 23 senses the lifting action of the sewing needle 22 and sends a sewing needle 22 lifting action signal to the controller 6. The controller 6, upon receiving the signal... After the needle 22 is lifted by the action signal, the first drive motor 31 and the second drive motor 51 are controlled to rotate synchronously for a predetermined step length, and then paused to wait for the needle 22 to complete the downward insertion action. When the first drive motor 31 and the second drive motor 51 synchronously complete the predetermined step length, the chain tooth 11 and the fabric 12 also move backward synchronously for a predetermined pitch. The predetermined step length is equal to the predetermined pitch, and the ratio of the predetermined pitch to the pitch of the chain tooth 11 is N, where N is a natural number greater than or equal to 1. The needle 22 can then perform the downward insertion action to guide the sewing thread to complete the stitching between the chain tooth 11 and the fabric 12. By setting the fabric conveying device 5 and the chain tooth traction device 3, and using the controller 6 to control the synchronous rotation and pause of the first drive motor 31 and the second drive motor 51, the fabric 12 and the chain tooth 11 move synchronously from front to back to transport materials to the sewing machine head 2. This not only provides stable synchronous feeding but also automates and automates the feeding process, greatly improving processing efficiency.

[0109] Under the control of the controller 6, the first drive motor 31 and the second drive motor 51 perform intermittent start and stop actions. This is because when the sewing needle 22 is performing sewing actions, including lifting it above the fabric 12 and moving it downward through the chain teeth 11 and the fabric 12, if the sewing needle 22 pulls the chain teeth 11 and the fabric 12 when it moves downward through the chain teeth 11 and the fabric 12, it will cause damage to the sewing needle 22. Therefore, it is necessary to control the first drive motor 31 and the second drive motor 51 to rotate when the sewing needle 22 is lifted above the fabric 12 to pull the chain teeth 11 and the fabric 12 forward. This helps to protect the sewing equipment.

[0110] The chain teeth 11 and the fabric 12 move backward synchronously by a predetermined pitch by controlling the first drive motor 31 and the second drive motor 51 to rotate synchronously by a predetermined step length. The means of controlling the rotation step length of the two motors include at least the following three methods: First, after receiving the signal of the needle 22 lifting action, the controller 6 controls the first drive motor 31 and the second drive motor 51 to rotate synchronously for a predetermined time T to control the predetermined step length of rotation. After the predetermined time T, the controller controls the first drive motor 31 and the second drive motor 51 to pause synchronously and wait for the needle 22 to complete the downward movement.

[0111] In the second method, after receiving the signal indicating that the needle 22 has lifted, the controller 6 controls the first drive motor 31 and the second drive motor 51 to rotate synchronously. The needle sensor 23 can also sense the downward pressing motion of the needle 22 and send a downward pressing signal to the controller 6. Upon receiving this signal, the controller 6 controls the first drive motor 31 and the second drive motor 51 to pause rotating synchronously to wait for the needle 22 to complete its insertion. In other words, the controller 6 uses the sensing signal from the needle sensor 23 to control the synchronous rotation of the first drive motor 31 and the second drive motor 51 by a predetermined step. Of course, besides using one sensor to detect the needle 22's movement, two independent sensors can be used to separately detect the lifting and pressing motions of the needle 22.

[0112] The third type is where the first drive motor 31 and the second drive motor 51 are servo motors. The controller 6 includes a pulse signal generator. After receiving the signal for the needle 22 to lift, the controller 6 sends a predetermined number of pulse signals to the first drive motor 31 and the second drive motor 51 through the pulse signal generator to control the first drive motor 31 and the second drive motor 51 to rotate synchronously by an angle and a number of revolutions. Then, the pulse signal generator is stopped sending pulse signals to control the first drive motor 31 and the second drive motor 51 to pause synchronously and wait for the needle 22 to complete the downward insertion action.

[0113] In this process, the chain tooth 11 moves backward together with the fabric 12 by a predetermined pitch L1. The chain tooth 11 has a pitch L0, where L1:L0 = N, and N is a positive integer greater than or equal to 1. This means that the sewing needle 22 can achieve fine sewing within one chain tooth pitch or across multiple chain tooth pitches to achieve different widths of sewing. The controller 6 controls the first drive motor 31 and the second drive motor 51 to synchronously complete a predetermined step length, thereby controlling the predetermined pitch of synchronous movement of the chain tooth 11 and the fabric 12. This not only allows for the adaptation of chain teeth 11 of different specifications by setting the predetermined step length of the motors, improving the versatility of the equipment, but also enables the achievement of different widths of sewing techniques by adjusting the predetermined pitch of synchronous movement of the chain tooth 11 and the fabric 12.

[0114] The sewing head 2 is a device for sewing the chain teeth 11 and the fabric 12. It also includes a sewing motor 21 and a needle mounting post 24. The needle 22 is detachably mounted on the bottom of the needle mounting post 24. Driven by the sewing motor 21, the needle mounting post 24 can perform continuous reciprocating motion, thereby carrying the needle 22 in reciprocating motion. The sewing motor 21 is an independently controlled motor, which can also be connected to the controller 6 for unified control. The sewing motor 21 does not necessarily have a synchronous action relationship with the first drive motor 31 and the second drive motor 51, but the sewing motor 21 starts before the first drive motor 31 and the second drive motor 51. This is so that the controller 6 can first calculate the position state of the needle 22 through the signal sent by the needle sensor 23, and then control the first drive motor 31 and the second drive motor 51 to move the chain teeth 11 and the fabric 12 to avoid the needle 22 that is going under.

[0115] The needle sensor 23 is a sensor used to sense the movement of the needle 22. To facilitate the detection of the needle 22's movement, the needle sensor 23 is disposed on the side of the needle mounting post 24 to detect the vertical movement of the needle mounting post 24. When the needle mounting post 24 passes the needle sensor 23 from bottom to top, the needle sensor 23 is triggered and sends a needle 22 lifting signal to the controller 6. Similarly, when the needle mounting post 24 passes the needle sensor 23 from top to bottom, the needle sensor 23 can also be configured to be triggered and send a needle 22 pressing signal to the controller 6. Furthermore, a trigger can be disposed on the needle mounting post 24, which can move vertically together with the trigger. When the trigger approaches the needle sensor 23, the needle sensor 23 is triggered and sends a needle 22 lifting signal or a needle 22 pressing signal to the controller 6. The specific structures of the needle sensor 23 and the needle mounting post 24 (trigger) are varied. The first structure is shown in Figure 13, where the needle sensor 23 is a Hall sensor and a magnet is mounted on the upper part of the needle mounting post 24. Alternatively, the needle sensor 23 may be a photoelectric sensor, and the top of the needle mounting post 24 may be able to move back and forth to achieve blocking or separation. Furthermore, a notch may be made in the needle mounting post 24. The second structure is shown in Figure 14, where the needle sensor 23 is a tactile microswitch and a pressing block is provided on the needle mounting post 24. When the needle mounting post 24 moves up and down, it triggers the microswitch to generate an action signal. By setting the needle sensor 23, the lifting or pressing action of the needle 22 is converted into a signal and sent to the controller 6, so that the controller 6 can accurately obtain the position status of the needle 22 and perform regular start and stop control on the first drive motor 31 and the second drive motor 51. This not only avoids interference between the needle 22 and the chain teeth 11 and the fabric 12, but also protects the sewing equipment well.

[0116] The chain tooth 11 is a long, continuous strip structure, as shown in Figure 9. The chain tooth traction device 3 can continuously pull the chain tooth 11. The chain tooth traction device 3 also includes a traction wheel 32 and a pressing wheel 33. The traction wheel 32 is connected to the first drive motor 31. An annular groove 321 for placing the chain tooth 11 is provided on the outer peripheral wall of the traction wheel 32. The pressing wheel 33 rotatably presses against the outer peripheral wall of the traction wheel 32 and covers part of the annular groove 321. The first drive motor 31 can drive the traction wheel 32 to rotate, and the traction wheel 32 then pulls the chain tooth 11 placed in the annular groove 321 to move.

[0117] Furthermore, the frame 100 is also provided with a chain tooth 11 storage device 101 and a guide wheel 102. The chain tooth 11 storage device 101 is used to store the chain teeth 11 arranged in a strip, and the guide wheel 102 is arranged between the traction wheel 32 and the chain tooth 11 storage device 101 to guide the chain teeth 11 to move toward the traction wheel 32.

[0118] Fabric 12 is a pre-cut sheet material, with no continuity between fabric 12 and other fabric 12. Fabric 12 has a sewn section 121, as shown in Figures 6 and 11. The fabric conveying device 5 includes a clamping plate 52 for holding the fabric 12. After the clamping plate 52 holds the fabric 12, the sewn section 121 of the fabric 12 is exposed on the outer edge of the clamping plate 52. The fabric conveying device 5 also includes a guide rail 53 and a bracket 54. The guide rail 53 is fixedly connected to the frame 100, and the bracket 54 is slidably connected to the guide rail 53. A second drive motor 51 is driven by the bracket 54. The clamping plate 52 is detachably connected to the bracket 54. Driven by the second drive motor 51, the bracket 54 can move back and forth along the guide rail 53, carrying the clamping plate 52. Furthermore, the clamping plate 52 is detachably connected to the bracket 54, allowing for the installation and replacement of multiple clamping plates 52 to improve processing efficiency. By clamping the fabric 12 with the clamping plate 52, the fabric 12 can be effectively clamped and fixed, and the sewn part 121 of the fabric 12 can also be well unfolded and tensioned. Then, it is transported by the automatically controlled second drive motor 51, which allows the fabric 12 and the chain teeth 11 to move synchronously. Compared with the prior art, the feeding speed of the present invention is stable, which effectively solves the problems of deviation, inconsistent speed and tension when feeding manually, and greatly improves the aesthetics of the sewing between the chain teeth 11 and the fabric 12.

[0119] Furthermore, a first sensor 55 connected to the controller 6 is provided on the guide rail 53. The first sensor 55 divides the sliding stroke of the bracket 54 along the guide rail 53 into a preparation section and a sewing section. The controller 6 can independently control the second drive motor 51 to drive the bracket 54 and the clamping plate 52 to move rapidly in the preparation section. When the bracket 54 triggers the first sensor 55, the first sensor 55 sends a first signal to the controller 6. After receiving the first signal from the first sensor 55, the controller 6 controls the first drive motor 31 and the second drive motor 51 to rotate synchronously, so that the fabric 12 and the chain teeth 11 pass through the sewing head 2 at the same speed in the sewing section to achieve sewing.

[0120] The distance the bracket 54, carrying the clamp 52, moves forward along the guide rail 53 is controlled by the controller 6. Corresponding to the three methods mentioned above for controlling the rotation step size of the two motors, the controller can control the movement distance through the number of output pulses, rotation time, and the needle sensor 23. Furthermore, control can also be achieved using a sensor mounted on the guide rail 53. A second sensor 56, connected to the controller 6, is mounted on the guide rail 53. The second sensor 56 is located behind the first sensor 55 and is used to detect the maximum backward travel position of the bracket 54. After the bracket 54, carrying the clamp 52, passes the suture head 2, the second sensor 56 is triggered. The second sensor 56 sends a second signal to the controller 6. Upon receiving the second signal from the first sensor 55, the controller 6 controls the first drive motor 31 and the second drive motor 51 to stop rotating.

[0121] Furthermore, the controller can also control the second drive motor 51 to drive the bracket 54 and clamp 52 to perform a backward movement. The specific control methods include at least the following: the first method is through a timer. After the controller controls the first drive motor 31 and the second drive motor 51 to rotate synchronously for a predetermined step, the controller controls the second drive motor 51 to rotate in the opposite direction after a set time. The second method is through a button or sensor. The button or sensor is connected to the controller. After the button or sensor is triggered, it sends a backward signal to the controller. After receiving the backward signal, the controller controls the second drive motor 51 to rotate in the opposite direction. The sensor referred to here can be the second sensor 56 mentioned above.

[0122] As shown in Figures 10 and 12, the chain tooth guiding device 4 has a chain tooth guiding groove 41 including a bottom wall 411 and two side walls (i.e., a left side wall 412 and a right side wall 413). The bottom wall 411, the left side wall 412, and the right side wall 413 define a cavity 410. The chain tooth moves by passing through the cavity 410 and along the extension direction of the groove 41. In this embodiment, a downwardly extending connecting post is provided on the sewing machine head 2. This connecting post can move up and down, and the rear end of the cover plate 42 is connected to the connecting post so that it can move up and down with the connecting post. The width of the cover plate 42 is not greater than the width of the chain tooth guide groove 41 (the width of the chain tooth guide groove 41 refers to the maximum width of the outer sidewalls of the left groove sidewall 412 and the right groove sidewall 413). When the cover plate 42 moves closer to the chain tooth guide groove 41, a fabric passage gap is left between the cover plate 42 and the two groove sidewalls of the chain tooth guide groove 41, and the sewing part 121 can extend into the underside of the cover plate 42 through the fabric passage gap.

[0123] The chain guide groove 41 is further provided with a left wing plate 43 and a right wing plate 44 on both sides, respectively. The upper surfaces of the left wing plate 43 and the right wing plate 44 are respectively below the upper surfaces of the left groove sidewall 412 and the right groove sidewall 413. The left wing plate 43 and the right wing plate 44 can respectively support the passing clamping plate 52. The front ends of the left wing plate 43 and the right wing plate 44 are also provided with chamfers to facilitate the smooth sliding of the clamping plate 52 onto the left wing plate 43 and the right wing plate 44.

[0124] A guide section 422 is provided at the front end of the cover plate 42, at least part of the guide section 422 extends forward beyond the chain tooth guide groove 41, and a chamfer is provided at the front end of the guide section 422 on the side facing the chain tooth guide groove 41.

[0125] The guide section 422 is also provided with a through hole 423 that extends vertically. A roller 424 is rotatably disposed in the through hole 423. At least a portion of the roller 424 protrudes downward beyond the lower surface of the guide section 422, and at least a portion of the roller 424 protrudes forward beyond the chain tooth guide groove 41.

[0126] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A method for sewing a chain tooth, wherein the chain tooth (A40) includes chain teeth and core thread (A20), and is provided with a traction section (A41), a pre-sewing section (A42), and a sewing section (A43) sequentially along its own extending direction; the sewing method includes: The traction section (A 41) is passed through the sewing station (AM) of the sewing equipment, and the pre-sewn section (A 42) is positioned at the sewing station (AM); Overlap the sewn section (A 43) on the edge of the fabric (A 10) and align the sewn section (A 43) with the edge of the fabric (A 10); An initial traction force is applied to the traction section (A 41) in front of the sewing station (AM) to pull the entire chain tooth (A 40) along the extension direction, and the chain teeth and core thread (A 20) in the pre-sewn section (A 42) are sewn together as the pre-sewn section (A 42) passes through the sewing station (AM). A traction force is continuously applied to the chain tooth (A 40) in front of the sewing station (AM) until the sewing segment (A 43) passes through the sewing station (AM), and the sewing segment (A 43) and the fabric (A 10) are kept moving synchronously along the extension direction as the sewing segment (A 43) passes through the sewing station (AM); As the sewing section (A 43) and the fabric (A 10) pass through the sewing station (AM), the sewing section (A 43) is sewn to the edge of the fabric (A 10).

2. The sewing method according to claim 1, wherein, The step of maintaining the synchronous movement of the sewing section (A 43) and the fabric (A 10) along the extension direction during the process of the sewing section (A 43) passing through the sewing station (AM) includes: During the process of the fabric (A 10) and the sewing section (A 43) passing through the sewing station (AM), the fabric (A 10) and the chain teeth (A 40) are controlled to move synchronously or stop intermittently along the extension direction.

3. The sewing method according to claim 2, wherein, The fabric (A 10) and the chain tooth (A 40) move a predetermined pitch in each intermittently synchronized cycle, the ratio of the predetermined pitch to the chain tooth pitch of the chain tooth (A 40) being N, where N is a natural number greater than or equal to 1.

4. The sewing method according to claim 2 or 3, wherein, Before the fabric (A 10) enters the sewing station (AM), the fabric (A 10) is controlled to be fed to the sewing station (AM) at a first speed; After the fabric (A 10) enters the sewing station (AM), the fabric (A 10) is controlled to travel intermittently through the sewing station (AM) at a second speed, and the second speed is less than the first speed.

5. The sewing method according to claim 1, wherein, During the conveying of the fabric (A 10), the fabric (A 10) is kept taut.

6. The sewing method according to claim 1, wherein, Before sewing the fabric (A 10) and the chain teeth (A 40), the edges of the fabric (A 10) are hemmed.

7. The sewing method according to claim 1, wherein, A traction station (AN) is provided in front of the sewing station (AM), and the step of continuously applying traction force to the chain tooth (A 40) in front of the sewing station (AM) until the sewing segment (A 43) passes through the sewing station (AM) includes: The chain teeth (A 40) are sequentially tractioned through the traction station (AN) until the sewing section (A 43) passes through the sewing station (AM).

8. The sewing method according to claim 1, wherein, After sewing the sewn section (A 43) to the edge of the fabric (A 10), the sewing method further includes: Cut off the traction section (A 41) and the pre-seam section (A 42).

9. The sewing method according to claim 1, wherein, The step of sewing the sewn section (A 43) to the edge of the fabric (A 10) includes: The chain teeth and the core thread (A 20) within the sewing section (A 43) area are sewn together to the edge of the fabric (A 10).

10. A garment with chain teeth, comprising: Fabric (A 10) and chain teeth (A 40); The chain tooth (A 40) is sewn to the edge of the fabric (A 10) using the sewing method described in any one of claims 1 to 9.

11. A flexible bag with chain teeth, comprising: Fabric (A 10) and chain teeth (A 40); The chain tooth (A 40) is sewn to the edge of the fabric (A 10) using the sewing method described in any one of claims 1 to 9.

12. A chain sewing device, comprising a frame and a sewing head mounted on the frame, the sewing head including a reciprocating needle for guiding the sewing thread for sewing; and further including a chain tooth traction device, a chain tooth guiding device, and a fabric conveying device; The chain tooth guiding device includes a chain tooth guiding groove and a cover plate disposed on the chain tooth guiding groove. The cover plate is movable up and down. The chain tooth guiding groove is used to guide the chain tooth forward. The cover plate is provided with a clearance hole so that the sewing needle can pass through. The chain tooth traction device is located on the rear side of the sewing machine head. The chain tooth traction device includes a first drive motor, which is used to pull the chain teeth arranged in a strip from front to back so that the chain teeth can move through the chain tooth guide groove. The fabric conveying device includes a second drive motor and a clamping plate. The clamping plate is used to hold the fabric. The second drive motor can drive the clamping plate to move from front to back to convey the fabric to the sewing machine head. The fabric has a sewing part. When the clamping plate carries the fabric forward, the sewing part passes under the cover plate through the clearance hole, so that the sewing needle passes through the sewing part when performing the downward insertion action. It also includes a controller and a needle sensor. The needle sensor, a first drive motor, and a second drive motor are signal-connected to the controller. The needle sensor is used to sense the lifting action of the needle and send a needle lifting action signal to the controller. After receiving the needle lifting action signal, the controller controls the first drive motor and the second drive motor to synchronously complete a predetermined step length of rotation, and then pauses to wait for the needle to complete the downward movement. When the first drive motor and the second drive motor synchronously complete the predetermined step length, the chain tooth and the fabric also move backward synchronously by a predetermined pitch. The predetermined step length is equal to the predetermined pitch, and the ratio of the predetermined pitch to the pitch of the chain tooth is N, where N is a natural number greater than or equal to 1. The needle can perform the downward movement to guide the sewing thread to complete the stitching between the chain tooth and the fabric.

13. The chain stitching device according to claim 12, wherein, The first drive motor and the second drive motor are servo motors. The controller includes a pulse signal generator. After receiving the needle lifting action signal, the controller sends the same predetermined number of pulse signals to the first drive motor and the second drive motor simultaneously through the pulse signal generator to control the first drive motor and the second drive motor to rotate synchronously by a predetermined step. Then, the pulse signal generator stops sending pulse signals to control the first drive motor and the second drive motor to pause synchronously and wait for the needle to complete the downward insertion action.

14. The chain stitching device according to claim 12, wherein, The controller includes a timer. After receiving the needle lifting action signal, the controller controls the first drive motor and the second drive motor to rotate synchronously for a predetermined time T to control the predetermined step size of the rotation. After the predetermined time T, the controller controls the first drive motor and the second drive motor to pause synchronously and wait for the needle to complete the downward insertion action.

15. The chain stitching device according to claim 12, wherein, After receiving the needle lifting action signal, the controller controls the first drive motor and the second drive motor to rotate synchronously. The needle sensor can also sense the needle pressing down and send a needle pressing signal to the controller. After receiving the needle pressing signal, the controller controls the first drive motor and the second drive motor to stop rotating synchronously to wait for the needle to complete the downward movement.

16. The chain stitching device according to any one of claims 12 to 15, wherein, The suture head also includes a suture motor and a needle mounting post. The needle is detachably mounted on the bottom of the needle mounting post. Driven by the suture motor, the needle mounting post can perform continuous reciprocating motion, thereby carrying the needle in reciprocating motion.

17. The chain stitching device according to claim 16, wherein, The needle sensor is located on the side of the needle mounting post to detect the movement of the needle mounting post.

18. The chain stitching device according to any one of claims 12 to 15, wherein, The fabric conveying device also includes a guide rail and a bracket. The guide rail is fixedly connected to the frame, and the bracket is slidably connected to the guide rail. The second drive motor is driven by the bracket, and the clamping plate is connected to the bracket. Under the drive of the second drive motor, the bracket can move back and forth along the guide rail with the clamping plate.

19. The chain stitching device according to claim 18, wherein, The clamp is detachably connected to the bracket.

20. The chain stitching device according to claim 18, wherein, A first sensor connected to the controller is installed on the guide rail. The first sensor divides the travel of the bracket along the guide rail into a preparation section and a sewing section. The controller can independently control the second drive motor to drive the bracket and clamp to move quickly in the preparation section. When the bracket triggers the first sensor, the first sensor sends a first signal to the controller. After receiving the first signal from the first sensor, the controller controls the first drive motor and the second drive motor to rotate synchronously, so that the fabric and the chain teeth pass through the sewing head at the same speed in the sewing section to achieve sewing.

21. The chain stitching device according to any one of claims 12 to 15, wherein, The chain tooth traction device further includes a traction wheel and a clamping wheel, wherein the traction wheel is connected to a first drive motor, and an annular groove for placing chain teeth is provided on the outer peripheral wall of the traction wheel. The clamping wheel rotatably presses against the outer peripheral wall of the traction wheel and presses against part of the annular groove. The first drive motor can drive the traction wheel to rotate. During the rotation, the traction wheel and the clamping wheel clamp the chain teeth and pull the chain teeth to move from front to back.

22. The chain stitching device according to claim 21, wherein, The frame is also equipped with a tooth storage device and a guide wheel. The tooth storage device is used to store the teeth arranged in a strip, and the guide wheel is arranged between the traction wheel and the tooth storage device to guide the teeth to move toward the traction wheel.

23. The chain stitching device according to any one of claims 12 to 15, wherein, The width of the cover plate is not greater than the width of the chain tooth guide groove. When the cover plate moves closer to the chain tooth guide groove, there is a fabric passage gap between the cover plate and the chain tooth guide groove, and the sewing part can extend into the underside of the cover plate through the fabric passage gap.

24. The chain stitching device according to claim 23, wherein, A left wing plate and a right wing plate are respectively provided on both sides of the chain tooth guide groove, and the upper surface of the left wing plate and the right wing plate is lower than the upper surface of the groove sidewall of the chain tooth guide groove.

25. The chain stitching device according to claim 23, wherein, A guide section is provided at the front end of the cover plate, at least a portion of which extends forward beyond the chain tooth guide groove, and a chamfer is provided at the front end of the guide section facing the chain tooth guide groove.

26. The chain stitching device according to claim 25, wherein, The guide section is also provided with a through hole that extends vertically, and a roller is rotatably disposed in the through hole. At least a portion of the roller protrudes downward beyond the lower surface of the guide section, and at least a portion of the roller extends forward beyond the chain tooth guide groove.

27. The chain stitching device according to claim 25, wherein, The front ends of the left and right wing plates are also provided with chamfers.

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