Zipper tape sewing apparatus

Abstract

The present application relates to the field of garment processing. Disclosed is a zipper tape sewing apparatus. The zipper tape sewing apparatus comprises a frame, a sewing head, a fabric conveying device and a zipper tooth pulling device, wherein the frame is provided with a worktable surface, and the sewing head comprises a sewing needle; the fabric conveying device comprises a clamping plate for carrying and tensioning fabric, and the clamping plate is movable in a first direction and is configured to convey the fabric to the worktable surface; the zipper tooth pulling device is configured to convey zipper teeth to the worktable surface in the first direction; and the fabric conveying device and the zipper tooth pulling device are capable of synchronous conveying.

Description

Chain sewing equipment

[0001] Cross-referencing

[0002] This application claims priority to Chinese Patent Application No. 202510278917.6, filed on March 10, 2025, entitled "Chain Sewing Device"; Chinese Patent Application No. 202520410946.9, filed on March 10, 2025, entitled "Chain Sewing Device"; and Chinese Patent Application No. 202422572476.4, filed on October 24, 2024, entitled "Chain Sewing Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of garment processing technology, specifically relating to a chain sewing device. Background Technology

[0004] Currently, some garments have zipper straps sewn on. In the garment production process, the zipper strap needs to be produced separately first; that is, the zipper teeth are first sewn onto the fabric tape, and then the fabric tape is sewn onto the garment. This production method makes the production process more cumbersome and increases the amount of fabric tape used.

[0005] To improve production efficiency and reduce material usage, some garments have eliminated the fabric straps and instead sewed the chain teeth directly onto the garment. This method reduces production steps, increases production efficiency, eliminates the need for fabric straps, reduces material usage, and helps lower costs.

[0006] However, some zipper sewing machines in related technologies are only suitable for sewing zipper teeth onto long strips of fabric, using tensioning wheels and conveyor wheels to tension and transport the strips. However, since garment sewing uses pieces of fabric of varying sizes or irregular shapes, traditional tensioning wheels and conveyor wheels cannot effectively tension and transport the fabric. Therefore, currently, fabric feeding must be done manually, but due to human factors, problems such as fabric wrinkling and unstable feeding speed of the zipper teeth and fabric can occur. Summary of the Invention

[0007] This application provides a chain sewing device, including: a frame and a sewing head, a fabric conveying device, and a chain tooth traction device respectively disposed on the frame; the frame has a worktable, the sewing head includes sewing needles corresponding to the worktable; the fabric conveying device includes a clamp for carrying and tensioning fabric, the clamp is movable along a first direction for conveying fabric to the worktable; the chain tooth traction device is used to convey chain teeth to the worktable along the first direction; the fabric conveying device and the chain tooth traction device can convey fabric synchronously.

[0008] This invention proposes a chain 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 tooth traction device, a chain tooth guiding device, and a fabric conveying device. The chain tooth guiding device includes a chain tooth guide groove and a cover plate mounted on the groove. The cover plate is movable up and down. The guide groove guides the chain teeth, and the cover plate has clearance holes for the needle to pass through. The chain tooth traction device is located at the rear of the sewing head and includes a first drive motor for pulling the chain teeth 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 sewing sections. When the clamping plate... As the fabric moves forward, the sewing section passes under the cover plate through the clearance hole, allowing the needle to pass through the sewing section during its downward movement. 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 needle lifting motion and sends a needle lifting motion signal to the controller. Upon receiving the needle lifting motion 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 movement. While the first and second drive motors synchronously complete the predetermined step, the chain teeth and 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. Driven by the sewing motor, the needle performs a downward movement, guiding the thread to complete the sewing between the chain teeth and the fabric.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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 a clamping plate for holding the fabric. After the fabric is clamped by the clamping plate, the sewing section of the fabric is generally exposed on the outer edge of the clamping plate. 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 plate is connected to the bracket. Driven by the second drive motor, the bracket can move back and forth along the guide rail with the clamping plate. Furthermore, the clamping plate is detachably connected to the bracket.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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:

[0020] 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.

[0021] 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.

[0022] 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. Attached Figure Description

[0023] Figure 1 is a schematic diagram of the chain sewing equipment, chain teeth and fabric disclosed in an embodiment of this application;

[0024] Figure 2 is a schematic diagram of the sewing machine head, fabric conveying device, chain tooth traction device, guide wheel, guide rail and fabric structure disclosed in the embodiments of this application;

[0025] Figure 3 is a schematic diagram of the fabric conveying device and fabric structure disclosed in the embodiments of this application;

[0026] Figure 4 is a schematic diagram of the structure of the sewing machine head, chain tooth traction device, guide wheel and chain teeth disclosed in the embodiments of this application;

[0027] Figure 5 is a partial structural schematic diagram of the frame and chain tooth traction device disclosed in the embodiment of this application;

[0028] Figure 6 is a partial structural schematic diagram of the frame, sewing machine head and chain guide device disclosed in the embodiments of this application;

[0029] Figure 7 is a schematic diagram of the structure of the cover plate and rollers disclosed in the embodiment of this application;

[0030] Figure 8 is a schematic diagram of the structure of the base disclosed in the embodiment of this application;

[0031] Figure 9 is a schematic diagram of the structure of the suture head and the first type of suture needle sensor disclosed in the embodiments of this application;

[0032] Figure 10 is a schematic diagram of the structure of the suture head and the second type of suture needle sensor disclosed in the embodiments of this application;

[0033] Figure 11 is a schematic diagram of the axial side structure of the chain sewing device;

[0034] Figure 12 is a magnified schematic diagram of the local structure at point aM in Figure 1;

[0035] Figure 13 is a schematic diagram of the axial structure of the chain sewing equipment, showing the hidden parts of the frame and fabric conveying device.

[0036] Figure 14 is a magnified view of the structure at point K in Figure 3;

[0037] Figure 15 is a magnified schematic diagram of the structure at point L in Figure 4;

[0038] Figure 16 is a schematic diagram of the axial structure of the clamping plate;

[0039] Figure 17 is an exploded structural diagram of the chain tooth guiding device;

[0040] Figure 18 is a schematic diagram of the first structure of the needle sensor;

[0041] Figure 19 is a schematic diagram of the second structure of the needle sensor.

[0042] Explanation of reference numerals in the attached drawings: 10-Frame; M-Workbench; 11-Guide rail; 11a-Preparation section; 11b-Sewing section; 20-Sewing head; 21-Sewing needle; 22-Sewing motor; 23-Sewing needle mounting post; 30-Fabric conveying device; 31-Second drive motor; 32-Bracket; 33-Clamping plate; 40-Chain tooth traction device; 41-First drive motor; 42-Traction wheel; 421-Annular groove; 43-Pressure wheel; 50-Controller; 60-Chain tooth guiding device; 61-Base; 611-Chain tooth guide groove; 6121-Left wing plate; 6122-Right wing plate; 62-Cover plate; 621-Allowing hole; 622-Guide section; 6221-Through hole; 63-Roller; 70-Storage device; 81-First sensor; 82-Trigger element; 83-Sewing needle sensor; 91-Guide wheel. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0046] Referring to Figures 1 to 10, this application discloses a chain sewing device. The disclosed chain sewing device includes a frame 10 and a sewing head 20, a fabric conveying device 30, and a chain tooth traction device 40 respectively disposed on the frame 10.

[0047] The frame 10 may be provided with a worktable M, and the sewing head 20 includes a sewing needle 21 corresponding to the worktable M. The sewing needle 21 is capable of continuous reciprocating motion and is used to guide the suture thread for sewing.

[0048] The fabric conveying device 30 includes a clamping plate 33 for carrying and tensioning the fabric. The clamping plate 33 is movable along a first direction for conveying the fabric to the workbench M. Optionally, the fabric can be a pre-cut sheet material, with no continuity between different fabrics. Each fabric has a sewn section, and after the clamping plate 33 clamps the fabric, the sewn section of the fabric is exposed on the outer edge of the clamping plate 33.

[0049] Based on the above settings, by setting the clamping plate 33 to hold the fabric, the fabric can be effectively clamped and fixed, and the sewn parts of the fabric can be well unfolded and tensioned during conveying, so that the fabric and the chain teeth move synchronously.

[0050] Optionally, the fabric may have a sewn section that can pass under the needle 21 as the clamp 33 carries the fabric, so that the sewn section is pierced by the reciprocating motion of the needle 21 to facilitate sewing the fabric.

[0051] The chain tooth traction device 40 is used to feed the chain teeth to the worktable surface M along the first direction. The chain tooth traction device 40 can make the chain teeth pass under the sewing needle 21 so that the chain teeth are sewn to the fabric by the reciprocating motion of the sewing needle 21.

[0052] In this embodiment, the fabric conveying device 30 and the chain tooth traction device 40 can convey the fabric synchronously.

[0053] Based on the above configuration, in the process of conveying the fabric, the clamping plate 33 can clamp and fix the fabric. On the one hand, it can ensure that the fabric will not move randomly during the conveying process, thus improving the conveying accuracy of the fabric. On the other hand, the clamping action of the clamping plate 33 can also meet the conveying needs of sheet-shaped or irregularly shaped fabrics of different sizes, and ensure that the fabric will not wrinkle or loosen during the conveying process, thus improving the applicability of the fabric conveying device 30 and further improving the applicability of the entire chain sewing equipment. In addition, the fabric conveying device 30 and the chain tooth traction device 40 can also convey the fabric and chain teeth synchronously, preventing the normal sewing process from being affected by the asynchronous conveying of the fabric and chain teeth.

[0054] Compared to manual feeding, the embodiments of this application effectively solve the problems of misalignment, inconsistent speed, and inconsistent tension during manual feeding, which can improve the aesthetics of the stitching between the chain teeth and the fabric.

[0055] In some embodiments, the chain sewing equipment may further include a controller 51, which is signal-connected to the fabric conveying device 30, the chain tooth traction device 40 and the sewing head 20 respectively, for controlling the fabric conveying device 30 and the chain tooth traction device 40 to convey synchronously, and controlling the sewing head 20 to sew the chain teeth and fabric at the worktable M.

[0056] Based on the above settings, under the control of the controller 50, the fabric conveying device 30 and the chain tooth traction device 40 can be synchronously controlled, thereby ensuring the synchronicity of the fabric conveying device 30's conveying of the fabric and the chain tooth traction device 40's conveying of the chain teeth, and preventing the chain tooth conveying and fabric conveying from being out of sync, which would affect normal sewing.

[0057] The chain tooth traction device 40 may include a first drive motor 41, and the fabric conveying device 30 may include a second drive motor 31. The controller 50 can be signal-connected to both the first drive motor 41 and the second drive motor 31, respectively, to control the first drive motor 41 and the second drive motor 31 to rotate synchronously by a preset step length, and to ensure synchronous conveying of the fabric conveying device 30 and the chain tooth traction device 40. Based on this, the synchronization of fabric conveying and chain tooth conveying can be guaranteed by controlling the first drive motor 41 and the second drive motor 31 through the controller 50.

[0058] The preset step length and the predetermined pitch that moves synchronously with the fabric and chain teeth can be equal, 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.

[0059] Optionally, the chain teeth and fabric can move synchronously by a predetermined pitch L1, where the chain tooth pitch is L0, and L1:L0 = N, where N is a natural number (or a positive integer) greater than or equal to 1. That is, the sewing needle 21 can achieve fine sewing within one chain tooth pitch, or it can achieve sewing across multiple chain tooth pitches at different widths. By controlling the first drive motor 41 and the second drive motor 31 synchronously to complete a predetermined step length through the controller 50, the predetermined pitch of synchronous movement of the chain teeth and fabric can be controlled. This not only allows for the adaptation of chain teeth of different specifications to different specifications by setting the predetermined step length of the motors, thus improving the versatility of the equipment, but also enables the implementation of different sewing techniques at different widths by adjusting the predetermined pitch of synchronous movement of the chain teeth and fabric.

[0060] Additionally, the chain sewing device may also include a needle sensor 83, which is located on the sewing head 20 and is used to detect the lifting action of the needle 21. The needle sensor 83 is signal-connected to the controller 50. Based on this, when the controller 50 receives the needle 21 lifting action signal sent by the needle sensor 83, it controls the first drive motor 41 and the second drive motor 31 to rotate synchronously by a preset step length, and after a first preset time period, controls the needle 21 to complete the piercing action.

[0061] Specifically, the needle sensor 83 is used to sense the lifting action of the needle 21 and send a needle 21 lifting action signal to the controller 50. After receiving the needle 21 lifting action signal, the controller 50 controls the first drive motor 41 and the second drive motor 31 to synchronously complete the rotation of the preset step length, and then pauses and waits for the needle 21 to complete the downward movement. When the first drive motor 41 and the second drive motor 31 synchronously complete the preset step length, the chain teeth and the fabric move synchronously along the first direction by a preset pitch, which is equal to the preset step length. The needle 21 can perform a piercing action to guide the suture to sew between the chain teeth and the fabric.

[0062] Therefore, this embodiment of the application sets up a fabric conveying device 30 and a chain tooth traction device 40, and uses a controller 50 to control the first drive motor 41 and the second drive motor 31 to rotate and stop synchronously, so that the fabric and chain teeth do not move, and the material is conveyed to the sewing machine head 20. It can not only provide stable synchronous feeding, but also realize the automation and intelligence of feeding, which greatly improves the production efficiency of clothing.

[0063] Under the control of the controller 50, the first drive motor 41 and the second drive motor 31 can perform intermittent start or stop actions. This is because the sewing action of the needle 21 includes lifting it above the fabric and moving it down through the chain teeth and fabric. If the needle 21 pulls the chain teeth and fabric when it moves down through the chain teeth and fabric, it will cause damage to the needle 21. Therefore, it is necessary to control the first drive motor 41 and the second drive motor 31 to start when the needle 21 is lifted above the fabric so as to drive the chain teeth and fabric forward respectively, which helps to protect the chain sewing equipment.

[0064] In this embodiment, the synchronous movement of the chain teeth and the fabric by a predetermined pitch is controlled by the synchronous rotation of the first drive motor 41 and the second drive motor 31 by a predetermined step length. The means of controlling the rotation step length of the first drive motor 41 and the second drive motor 31 can include the following three:

[0065] In the first method, after receiving the signal that the needle 21 is lifted, the controller 50 controls the first drive motor 41 and the second drive motor 31 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 41 and the second drive motor 31 to pause synchronously and wait for the needle 21 to complete the downward insertion action.

[0066] In the second method, after receiving the needle 21 lifting action signal, the controller 50 controls the first drive motor 41 and the second drive motor 31 to rotate synchronously. The needle sensor 83 can sense the downward pressing action of the needle 21 and send a pressing signal of the needle 21 to the controller 50. After receiving the pressing signal of the needle 21, the controller 50 controls the first drive motor 41 and the second drive motor 31 to stop rotating synchronously to wait for the needle 21 to complete the downward insertion action. That is, the controller 50 realizes the control of the first drive motor 41 and the second drive motor 31 to rotate synchronously in a predetermined step size through the sensing signal of the needle sensor 83. Of course, in addition to using one needle sensor 83 to sense the action of the needle 21, two independent needle sensors 83 can also be set to detect the lifting and pressing actions of the needle 21 separately.

[0067] In the third type, both the first drive motor 41 and the second drive motor 31 are servo motors. The controller 50 may include a pulse signal generator (not shown in the figure). After receiving the signal that the needle 21 is lifted, the controller 50 can send the same predetermined number of pulse signals to the first drive motor 41 and the second drive motor 31 at the same time through the pulse signal generator to control the first drive motor 41 and the second drive motor 31 to rotate synchronously by a predetermined step, that is, to rotate synchronously by the angle and the number of turns. Then, the pulse signal generator is stopped from sending pulse signals to control the first drive motor 41 and the second drive motor 31 to stop simultaneously and wait for the needle 21 to complete the downward insertion action.

[0068] In some embodiments, the controller 50 may also use a timer (not shown) to time the synchronous rotation of the first drive motor 41 and the second drive motor 31, and control the first drive motor 41 and the second drive motor 31 to pause synchronously for a first preset time after the synchronous rotation duration reaches a second preset duration.

[0069] Referring to Figures 4 and 6, in some embodiments, the suture head 20 may include a suture motor 22 and a needle mounting post 23. The main body of the suture motor 22 is connected to the frame 10. The needle mounting post 23 is movably disposed on the main body of the suture motor 22 along a second direction. The needle 21 is detachably disposed on the first end of the needle mounting post 23, wherein the second direction is perpendicular to the first direction. The output end of the suture motor 22 is drively connected to the needle mounting post 23 to allow the second end of the needle mounting post 23 to contact or separate from the needle sensor 83, and to allow the first end of the needle mounting post 23 to move the needle 21 closer to or away from the worktable surface M. Exemplarily, the first direction may be a left-right direction, and the second direction may be a up-down direction.

[0070] Optionally, the needle 21 is detachably mounted at the bottom of the needle mounting post 23, which is driven by the sewing motor 22 to perform continuous reciprocating motion, thereby carrying the needle 21 in reciprocating motion.

[0071] Additionally, the sewing motor 22 may include an independently controlled motor, or it may be connected to the controller 50 for unified control. It should be noted that there is no necessary synchronous operation between the sewing motor 22, the first drive motor 41, and the second drive motor 31. However, the driving sequence of the sewing motor 22 can precede that of the first drive motor 41 and the second drive motor 31. This is so that the controller 50 can first calculate the position of the needle 21 based on the signal from the sewing sensor, and then control the first drive motor 41 and the second drive motor 31 to move the chain teeth and fabric respectively to avoid the threaded needle 21.

[0072] The needle sensor 83 is a sensor used to sense the movement of the needle 21. To facilitate the detection of the needle 21's movement, the needle sensor 83 can be located on the side of the needle mounting post 23 to detect the up-and-down movement of the needle mounting post 23. When the needle mounting post 23 passes the needle sensor 83 from bottom to top, the needle sensor 83 is triggered and sends a needle 21 lifting signal to the controller 50; similarly, when the needle mounting post 23 passes the needle sensor 83 from top to bottom, the needle sensor 83 can also be triggered and send a needle 21 pressing signal to the controller 50.

[0073] Optionally, a trigger can be set on the needle mounting post 23. The needle mounting post 23 can move up and down with the trigger. When the trigger approaches the needle sensor 83, the needle sensor 83 is triggered and sends a needle 21 lifting action signal or a needle 21 pressing signal to the controller 50.

[0074] The specific structures of the needle sensor 83 and the needle mounting post 23 are varied, with the first structure shown in Figures 1, 2, and 4. Optionally, the needle sensor 83 can be a Hall sensor, with a magnet mounted on the upper part of the needle mounting post 23; or, the needle sensor 83 can be a photoelectric sensor, with the top (i.e., the first end) of the needle mounting post 23 capable of moving back and forth to achieve obstruction or separation.

[0075] Furthermore, a notch can be made on the needle mounting post 23, as shown in Figure 10. The needle sensor 83 can be a tactile micro switch, and a pressing block can be provided on the needle mounting post 23. When the needle mounting post 23 moves up and down, the micro switch is triggered to generate an action signal.

[0076] Regardless of which method is used, by setting the needle sensor 83, the lifting or pressing action of the needle 21 can be converted into a signal and sent to the controller 50. This allows the controller 50 to accurately obtain the position status of the needle 21 and to perform regular start-stop control on the first drive motor 41 and the second drive motor 31, thus avoiding interference between the needle 21 and the chain teeth and the fabric, and effectively protecting the chain sewing equipment.

[0077] To enable the clamping plate 33 to move along the first direction, the fabric conveying device 30 may further include a bracket 32, as shown in Figures 2 and 3. The clamping plate 33 is mounted on the bracket 32, which is slidably connected to the frame 10 along the first direction. A second drive motor 31 is connected to the bracket 32 ​​for driving the bracket 32 ​​to move along the first direction.

[0078] Optionally, the clamping plate 33 is detachably provided on the bracket 32, so that multiple clamping plates 33 can be installed and replaced, thereby improving processing efficiency.

[0079] Considering that the chain needs to be sewn between two pieces of fabric, in this embodiment of the application, the fabric conveying device 30 may include two sets of clamping plates 33. The two sets of clamping plates 33 may be arranged at intervals in the horizontal direction. One set of clamping plates 33 is used to clamp one piece of fabric, and the other set of clamping plates 33 can be used to clamp the other piece of fabric. In this way, by driving the two sets of clamping plates 33 to move synchronously in the first direction, the synchronous conveying of the two pieces of fabric can be achieved, so as to ensure the conveying accuracy of the two pieces of fabric.

[0080] Optionally, the bracket 32 ​​can be a frame, and the clamp 33 can be connected to the inside of the frame. For example, the bracket 32 ​​can be a polygonal frame, such as a rectangular frame, a square frame, etc.

[0081] Optionally, the first drive motor 41 and the bracket 32 ​​can be connected by means of a lead screw and slider, worm gear, rack and pinion, etc.

[0082] Based on the above configuration, under the driving action of the second drive motor 31, the bracket 32 ​​can drive the clamping plate 33 to move along the first direction (i.e., from front to back), thereby conveying the fabric held by the clamping plate 33 to the workbench M so that it can be sewn by the sewing needle 21.

[0083] To achieve smooth sliding of the bracket 32, the frame 10 may be provided with a guide rail 11, which extends along the first direction. The bracket 32 ​​is slidably connected to the guide rail 11. In this way, the guide rail 11 can guide and limit the bracket 32, thereby improving the sliding stability and sliding accuracy of the bracket 32.

[0084] Referring to Figures 1 to 3, in some embodiments, the chain stitching device may further include a first sensor 81. The first sensor 81 is disposed on the guide rail 11 and signal-connected to the controller 50 to send signals to the controller 50; correspondingly, the bracket 32 ​​may be provided with a trigger 82 for triggering the first sensor 81. Additionally, the second drive motor 31 is signal-connected to the controller 50, so that the controller 50 can send control signals to the second drive motor 31 to control its operation.

[0085] Based on the above settings, under the control of the controller 50, as the bracket 32 ​​is driven to move along the first direction by the second drive motor 31, the trigger 82 will move synchronously with the bracket 32. When the trigger 82 moves to a position that cooperates with the first sensor 81, the first sensor 81 is triggered and sends a signal to the controller 50. The controller 50 then analyzes and judges the signal to determine the moving position of the bracket 32.

[0086] Referring to Figure 2, the guide rail 11 is divided into a preparation section 11a and a sewing section 11b by the first sensor 81. That is, the sliding stroke of the bracket 32 ​​along the guide rail 11 is divided into the preparation section 11a and the sewing section 11b. Along the first direction, the preparation section 11a is located downstream of the sewing section 11b. That is, as the bracket 32 ​​moves along the first direction, the trigger 82 is first located in the area corresponding to the preparation section 11a, and then after the trigger 82 triggers the first sensor 81, it moves to the area corresponding to the sewing section 11b.

[0087] When the trigger 82 corresponds to the preparation section 11a, the controller 50 can control the second drive motor 31 to drive the bracket 32 ​​to slide at a first speed; when the trigger 82 corresponds to the sewing section 11b, the controller 50 controls the first drive motor 41 and the second drive motor 31 to rotate synchronously, and drives the bracket 32 ​​to slide intermittently at a second speed through the second drive motor 32, and the second speed is less than the first speed.

[0088] Specifically, the controller 50 can independently control the second drive motor 31 to drive the bracket 32 ​​and clamping plate 33 to move rapidly in the preparation section 11a, thereby increasing the fabric transfer speed. When the trigger 82 of the bracket 32 ​​triggers the first sensor 81, the first sensor 81 sends a first signal to the controller 50. After receiving the first signal from the first sensor 81, the controller 50 controls the second drive motor 31 to start and controls the bracket 32 ​​to run intermittently at a second speed in the sewing section 11b. In addition, after receiving the first signal from the first sensor 81, the controller 50 can also control the chain tooth traction device 40 (or the first drive motor 41) to run synchronously with the second drive motor 31, so as to control the fabric and chain teeth to pass through the sewing head 20 at the same speed in the sewing section 11b to achieve sewing.

[0089] It should be noted that, since the sewing needle 21 reciprocates through the fabric in a vertical direction, the fabric needs to remain stationary while the needle 21 is piercing it to prevent motion interference caused by the different directions of sewing and fabric movement. Therefore, in this embodiment, the controller 50 controls the sewing head 20 and the second drive motor 31 respectively. When the needle 21 is lifted, the fabric is conveyed, ensuring that the needle piercing the fabric and the fabric movement do not occur simultaneously, thus guaranteeing proper sewing of the fabric by the needle 21.

[0090] In addition, since the first speed is greater than the second speed, the fabric transport time before sewing can be shortened, which can help improve sewing efficiency.

[0091] Of course, when the trigger 82 of the bracket 32 ​​triggers the first sensor 81, the first sensor 81 sends a first signal to the controller 50. After receiving the first signal from the first sensor 81, the controller 50 can also control the chain tooth traction device 40 to start and make the chain tooth traction device 40 convey the chain teeth at the same speed as the fabric conveying speed, so as to ensure the synchronous conveying of the chain teeth and the fabric.

[0092] In this embodiment, the distance that the bracket 32 ​​carrying the clamp 33 moves along the guide rail 11 is controlled by the controller 50. Corresponding to the three methods of controlling the rotation step size of the first drive motor 41 and the second drive motor 31, the controller 50 can control the movement distance by the number of output pulses, the rotation time, and the needle sensor 83.

[0093] Optionally, control can also be achieved using a sensor mounted on the guide rail 11. Specifically, a second sensor connected to the controller 50 is mounted on the guide rail 11. The second sensor is spaced apart from the first sensor 81 (e.g., the second sensor is located behind the first sensor 81) and is used to detect the maximum travel position of the bracket 32. When the bracket 32, carrying the clamp 33, passes through the sewing machine head 20, the second sensor is triggered. The second sensor sends a second signal to the controller 50. After receiving the second signal from the second sensor, the controller 50 controls the first drive motor 41 and the second drive motor 31 to stop rotating.

[0094] In addition, the controller 50 can also control the second drive motor 31 to drive the bracket 32 ​​and clamp 33 to perform a backward movement. Specific control methods include at least the following: The first method is through a timer. Specifically, after the controller 50 controls the first drive motor 41 and the second drive motor 31 to rotate synchronously for a predetermined step, after reaching a set time (i.e., the second preset time), the controller 50 controls the second drive motor 31 to rotate in the reverse direction. The second method is through a button or sensor. The button or sensor is signal-connected to the controller 50. When the button or sensor is triggered, it sends a backward signal to the controller 50. Upon receiving the backward signal, the controller 50 controls the second drive motor 31 to rotate in the reverse direction. Optionally, the sensor here can be the aforementioned second sensor.

[0095] Referring to Figures 4 and 5, in some embodiments, the chain tooth traction device 40 may include a traction wheel 42 and a clamping wheel 43. The traction wheel 42 and the clamping wheel 43 are arranged along a second direction for clamping the chain teeth, wherein the second direction is perpendicular to the first direction. A first drive motor 41 is connected to the traction wheel 42 for transmission. Based on this, the chain teeth can be clamped between the traction wheel 42 and the clamping wheel 43. The first drive motor 41 drives the traction wheel 42 to rotate, and under the action of friction, the traction wheel 42 drives the chain teeth to move along the first direction, so that the chain teeth can pass through the worktable surface M.

[0096] Optionally, the chain teeth can be a long, continuous strip structure, and the chain teeth can be pulled by the chain tooth traction device 40 so that the chain teeth pass through the worktable surface M.

[0097] Optionally, the outer peripheral wall of the traction wheel 42 may be provided with an annular groove 421, as shown in Figure 5, which is used to accommodate the chain teeth. In addition, the outer peripheral wall of the pressure wheel 43 may press against the outer peripheral wall of the traction wheel 42 and cover part of the annular groove 421. Under the driving action of the first drive motor 41, the traction wheel 42 rotates and pulls the chain teeth placed in the annular groove 421 to move.

[0098] Referring to Figures 1 and 4, in some embodiments, the chain sewing equipment may further include a chain tooth guide device 60, which is disposed on the worktable surface M. The chain tooth guide device 60 has a guide space extending along a first direction for the chain tooth to pass through. Thus, the chain tooth guide device 60 can guide the chain tooth to ensure the positional accuracy of the chain tooth during transmission.

[0099] Referring to Figures 6 to 8, the chain tooth guiding device 60 may include a base 61 and a cover plate 62. The base 61 is disposed on the workbench surface M, and the surface of the base 61 facing the sewing needle 21 is provided with a chain tooth guiding groove 611. The chain tooth guiding groove 611 extends along a first direction, so that the chain tooth can be accommodated through the chain tooth guiding groove 611 and the chain tooth can be guided.

[0100] Optionally, the chain tooth guide groove 611 may include a bottom wall and two side walls, namely, a left side wall and a right side wall. The bottom wall, the left side wall and the right side wall define a cavity, through which the chain tooth passes and can move along the extension direction of the chain tooth guide groove 611.

[0101] A cover plate 62 is disposed at the opening of the tooth guide groove 611. The cover plate 62 can be close to or far from the opening, and the cover plate 62 is provided with a clearance hole 621 for the needle 21 to pass through. Based on this, the opening of the tooth guide groove 611 can be sealed by the cover plate 62 to prevent the tooth from detaching from the tooth guide groove 611.

[0102] Optionally, the main body of the sewing machine head 20 may also be provided with a downwardly extending connecting column. The connecting column can move up and down, and the cover plate 62 is connected to the bottom end of the connecting column, so that the cover plate 62 can move up and down with the connecting column, so that the cover plate 62 can move closer to or further away from the slot.

[0103] Optionally, the width of the cover plate 62 can be less than or equal to the width of the chain guide groove 611, where the width of the chain guide groove 611 refers to the maximum width between the left and right sidewalls of the groove. Based on this, when the cover plate 62 moves to a position close to the opening of the chain guide groove 611, fabric passage gaps are formed between the cover plate 62 and the left and right sidewalls of the groove, respectively. This allows the sewing portion of the fabric to extend through these gaps between the cover plate 62 and the respective sidewalls of the groove, ensuring smooth fabric movement.

[0104] Referring to Figure 8, in some embodiments, the base 61 may include a left wing plate 6121 and a right wing plate 6122, wherein the left wing plate 6121 and the right wing plate 6122 are respectively disposed on the left and right sides of the chain tooth guide groove 611, and the surfaces of the left wing plate 6121 and the right wing plate 6122 are both lower than the end faces of the left groove sidewall and the right groove sidewall. The surfaces of the left wing plate 6121 and the right wing plate 6122 can respectively support the passing clamping plate 33 to ensure the smooth movement of the clamping plate 33.

[0105] Optionally, the front ends of the left wing plate 6121 and the right wing plate 6122 (i.e., the ends facing the fabric conveying device 30) are respectively provided with chamfers, which facilitates the smooth sliding of the clamping plate 33 onto the left wing plate 6121 and the right wing plate 6122.

[0106] Referring to Figures 6 and 7, in some embodiments, the cover plate 62 may have a guide section 622, which may have a through hole 6221 extending vertically. A rotatable roller 63 is provided in the through hole 6221. At least a portion of the roller 63 protrudes from the surface of the guide section 622 facing the chain tooth guide groove 611, so that at least a portion of the roller 63 can protrude into the groove opening of the chain tooth guide groove 611 to facilitate the compression of the fabric.

[0107] Optionally, the end of the guide section 622 facing the fabric conveying device 30 may extend into a chain tooth guide groove 611, and a chamfer may be provided at this end and on the side facing the chain tooth guide groove 611 to facilitate the input of the clamping plate 33.

[0108] Referring to Figures 1 and 4, in some embodiments, the chain stitching device may further include a storage device 70 and a guide wheel 91. The storage device 70 is used to store the strip-shaped chain teeth, and the guide wheel 91 is located between the chain tooth traction device 40 and the storage device 70 to guide the movement of the chain teeth.

[0109] In summary, the chain stitching device in this application embodiment has the following technical advantages:

[0110] First, by setting up a fabric conveying device 30 and a chain tooth traction device 40, and using a controller 50 to control the first drive motor 41 and the second drive motor 31 to rotate or stop synchronously, the synchronous movement of the fabric and chain teeth is realized, so as to synchronously convey the chain teeth and fabric to the sewing machine head 20. This not only provides stable synchronous feeding, but also realizes the automation and intelligence of feeding, thereby improving processing efficiency.

[0111] Secondly, by setting the clamping plate 33 to hold the fabric, the fabric can be effectively clamped and fixed, so that the sewn part of the fabric can be well unfolded and tensioned. Then, by automatically controlling the second drive motor 31 for conveying, the fabric and chain teeth can move synchronously and the speed of the two materials is stable. This effectively solves the problems of fabric deviation, uneven speed and uneven tension when feeding manually, which is conducive to improving the aesthetics of the sewing between the fabric and the chain teeth.

[0112] Third, by setting the needle sensor 83, the lifting or pressing action of the needle 21 can be converted into a signal and sent to the controller 50, so that the controller 50 can accurately obtain the position status of the needle 21 and perform regular start and stop control on the first drive motor 41 and the second drive motor 31, thereby avoiding interference between the needle 21 and the chain teeth and the fabric, which is beneficial to protecting the chain sewing equipment.

[0113] Fourth, the controller 50 controls the first drive motor 41 and the second drive motor 31 to synchronously complete the predetermined step length, thereby controlling the predetermined pitch of the synchronous movement of the chain teeth and the fabric. This not only allows for the adaptation of chain teeth of different specifications by controlling the predetermined step length of the motor, thus improving the versatility of the equipment, but also enables the implementation of different span sewing techniques by adjusting the predetermined pitch of the synchronous movement of the chain teeth and the fabric.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] As shown in Figures 11-17, a chain sewing device includes a frame a100 and a sewing head a2 mounted on the frame a100. The frame a100 has a worktable. The sewing head a2 includes a sewing needle a22 capable of continuous reciprocating motion, used to guide the sewing thread. The device also includes a chain tooth traction device a3, a chain tooth guiding device a4, and a fabric conveying device a5. The chain tooth guiding device a4 includes a chain tooth guiding groove a41 and a cover plate a42 mounted on the groove. The cover plate a42 is movable vertically. The chain tooth guiding groove a41 allows the chain tooth a11 to be guided within it. The cover plate a42 is provided with a clearance hole a421 to allow the sewing needle a22 to pass through; the chain tooth traction device a3 is located on the rear side of the sewing machine head a2, and the chain tooth traction device a3 includes a first drive motor a31, which is used to pull the chain teeth a11 arranged in a strip shape from front to back, so that the chain teeth a11 move through the chain tooth guide groove a41; the fabric conveying device a5 includes a second drive motor a51 and a clamping plate a52, the clamping plate a52 is used to clamp the fabric a12, and the second drive motor a51 can drive the clamping plate a52 to move from front to back, thereby conveying the fabric to the sewing machine head a2. a12; the fabric a12 has a sewn part a121, when the clamping plate a52 carries the fabric a12 forward, the sewn part a121 passes under the cover plate a42 through the avoidance hole a421 so that the sewing needle a22 passes through the sewn part a121 when performing the downward insertion action; it also includes a controller a6 and a sewing needle sensor a23, the sewing needle sensor a23, the first drive motor a31 and the second drive motor a51 are signal connected to the controller a6; the sewing needle sensor a23 is used to sense the lifting action of the sewing needle a22 and send the sewing needle a22 lifting action signal to the controller a6; the controller a6 in Upon receiving the signal to lift the sewing needle a22, the first drive motor a31 and the second drive motor a51 are controlled to synchronously complete a predetermined rotation step, and then paused to wait for the sewing needle a22 to complete the downward insertion action. When the first drive motor a31 and the second drive motor a51 synchronously complete the predetermined step, the chain tooth a11 and the fabric a12 also move backward synchronously 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 tooth a11 is N, where N is a natural number greater than or equal to 1. The sewing needle a22 is able to perform the downward insertion action to guide the sewing thread to complete the stitching between the chain tooth a11 and the fabric a12.By setting up the fabric conveying device a5 and the chain tooth traction device a3, and using the controller a6 to control the first drive motor a31 and the second drive motor a51 to rotate and stop synchronously, the fabric a12 and the chain tooth a11 move synchronously from front to back to convey materials to the sewing machine head a2. This not only provides stable synchronous feeding, but also realizes the automation and intelligence of feeding, greatly improving processing efficiency.

[0119] Under the control of the controller a6, the first drive motor a31 and the second drive motor a51 perform intermittent start and stop actions. This is because when the sewing needle a22 is performing the sewing action, including lifting it above the fabric a12 and moving it downward through the chain teeth a11 and the fabric a12, if the sewing needle a22 pulls the chain teeth a11 and the fabric a12 when it moves downward through the chain teeth a11 and the fabric a12, it will cause damage to the sewing needle a22. Therefore, it is necessary to control the first drive motor a31 and the second drive motor a51 to rotate when the sewing needle a22 is lifted above the fabric a12 to pull the chain teeth a11 and the fabric a12 forward. This helps to protect the sewing equipment.

[0120] The chain tooth a11 and the fabric a12 are moved backward synchronously by a predetermined pitch. This is achieved by controlling the first drive motor a31 and the second drive motor a51 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:

[0121] In the first method, after receiving the signal that the suture needle a22 is lifted, the controller a6 controls the first drive motor a31 and the second drive motor a51 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 a31 and the second drive motor a51 to pause synchronously and wait for the suture needle a22 to complete the downward insertion action.

[0122] In the second method, after receiving the signal indicating that the needle a22 has lifted, the controller a6 controls the first drive motor a31 and the second drive motor a51 to rotate synchronously. The needle sensor a23 can also sense the downward movement of the needle a22 and send a downward pressure signal to the controller a6. Upon receiving this signal, the controller a6 controls the first drive motor a31 and the second drive motor a51 to pause rotating synchronously, waiting for the needle a22 to complete its insertion. In other words, the controller a6 controls the first drive motor a31 and the second drive motor a51 to rotate synchronously by a predetermined step size using the signal from the needle sensor a23. Alternatively, besides using a single sensor to detect the movement of the needle a22, two independent sensors can be used to detect the lifting and lowering movements of the needle a22 separately.

[0123] The third type is where the first drive motor a31 and the second drive motor a51 are servo motors. The controller a6 includes a pulse signal generator. After receiving the lifting action signal of the suture needle a22, the controller a6 sends a predetermined number of pulse signals to the first drive motor a31 and the second drive motor a51 through the pulse signal generator to control the first drive motor a31 and the second drive motor a51 to rotate synchronously by an angle and a number of revolutions. Then, the pulse signal generator stops sending pulse signals to control the first drive motor a31 and the second drive motor a51 to pause synchronously and wait for the suture needle a22 to complete the downward insertion action.

[0124] In this process, the chain tooth a11 moves backward together with the fabric a12 by a predetermined pitch L1. The chain tooth a11 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 a22 can achieve fine sewing within one chain tooth a11 pitch, or it can achieve different width sewing across multiple chain tooth a11 pitches. The controller a6 controls the first drive motor a31 and the second drive motor a51 to synchronously complete a predetermined step length, thereby controlling the predetermined pitch of the synchronous movement of the chain tooth a11 and the fabric a12. This not only allows for the adaptation of chain teeth a11 of different specifications by setting the predetermined step length of the motors, improving the versatility of the equipment, but also enables the implementation of different width sewing techniques by adjusting the predetermined pitch of the synchronous movement of the chain tooth a11 and the fabric a12.

[0125] The sewing head a2 is a device for sewing the chain teeth a11 and the fabric a12. It also includes a sewing motor a21 and a needle mounting post a24. The needle a22 is detachably mounted on the bottom of the needle mounting post a24. The needle mounting post a24 can perform continuous reciprocating motion under the drive of the sewing motor a21, thereby carrying the needle a22 in reciprocating motion. The sewing motor a21 is an independently controlled motor, which can also be connected to the controller a6 for unified control. The sewing motor a21 does not necessarily have a synchronous operation relationship with the first drive motor a31 and the second drive motor a51, but the sewing motor a21 starts before the first drive motor a31 and the second drive motor a51. This is so that the controller a6 can first calculate the position state of the sewing needle a22 through the signal sent by the sewing needle sensor a23, and then control the first drive motor a31 and the second drive motor a51 to drive the chain teeth a11 and the fabric a12 to move and avoid the downward-passing sewing needle a22.

[0126] The needle sensor a23 is used to sense the movement of the needle a22. To facilitate the detection of the needle a22's movement, the needle sensor a23 is located on the side of the needle mounting post a24 to detect the vertical movement of the needle mounting post a24. When the needle mounting post a24 passes the needle sensor a23 from bottom to top, the needle sensor a23 is triggered and sends a needle a22 lifting signal to the controller a6. Similarly, when the needle mounting post a24 passes the needle sensor a23 from top to bottom, the needle sensor a23 can also be configured to be triggered and send a needle a22 pressing signal to the controller a6. Furthermore, a trigger can be provided on the needle mounting post a24. The needle mounting post a24 can move up and down together with the trigger. When the trigger approaches the needle sensor a23, the needle sensor a23 is triggered and sends a needle a22 lifting action signal or a needle a22 pressing action signal to the controller a6. The specific structures of the needle sensor a23 and the needle mounting post a24 (trigger) are varied. The first structure is shown in Figure 18, where the needle sensor a23 is a Hall sensor and a magnet is mounted on the upper part of the needle mounting post a24. Alternatively, the needle sensor a23 can be a photoelectric sensor, and the top of the needle mounting post a24 can move back and forth to achieve blocking or separation. Furthermore, a notch can be made in the needle mounting post a24. The second structure is shown in Figure 19, where the needle sensor a23 is a tactile microswitch and a pressing block is provided on the needle mounting post a24. When the needle mounting post a24 moves up and down, it triggers the microswitch to generate an action signal. By setting a needle sensor a23, the lifting or pressing action of the needle a22 is converted into a signal and sent to the controller a6. This allows the controller a6 to accurately obtain the position status of the needle a22 and perform regular start-stop control on the first drive motor a31 and the second drive motor a51. This not only avoids interference between the needle a22 and the chain teeth a11 and the fabric a12, but also effectively protects the sewing equipment.

[0127] The chain tooth a11 is a long, continuous strip structure, as shown in Figure 14. The chain tooth a11 can be continuously pulled by the chain tooth traction device a3. The chain tooth traction device a3 also includes a traction wheel a32 and a pressure wheel a33. The traction wheel a32 is connected to the first drive motor a31. An annular groove a321 for placing the chain tooth a11 is provided on the outer peripheral wall of the traction wheel a32. The pressure wheel a33 rotatably presses against the outer peripheral wall of the traction wheel a32 and covers part of the annular groove a321. The first drive motor a31 can drive the traction wheel a32 to rotate, and the traction wheel a32 then pulls the chain tooth a11 placed in the annular groove a321 to move.

[0128] Furthermore, the frame a100 is also provided with a chain tooth a11 storage device a101 and a guide wheel a102. The chain tooth a11 storage device a101 is used to store the chain teeth a11 arranged in a strip. The guide wheel a102 is arranged between the traction wheel a32 and the chain tooth a11 storage device a101 to guide the chain teeth a11 to move toward the traction wheel a32.

[0129] Fabric a12 is a pre-cut sheet of material. Fabric a12 is not continuous with other fabrics a12. Fabric a12 has a sewn section a121, as shown in Figures 11 and 16. The fabric conveying device a5 includes a clamping plate a52 for holding the fabric a12. After the clamping plate a52 holds the fabric a12, the sewn section a121 of the fabric a12 is exposed on the outer edge of the clamping plate a52. The fabric conveying device a5 also includes a guide rail a53 and a bracket a54. The guide rail a53 is fixedly connected to the frame a100, and the bracket a54 is slidably connected to the guide rail a53. A second drive motor a51 is driven by the bracket a54. The clamping plate a52 is detachably connected to the bracket a54. Driven by the second drive motor a51, the bracket a54 can move back and forth along the guide rail a53, carrying the clamping plate a52. Furthermore, the clamping plate a52 is detachably connected to the bracket a54, allowing for the installation and replacement of multiple clamping plates a52 to improve processing efficiency. By clamping the fabric a12 with the clamping plate a52, the fabric a12 can be effectively clamped and fixed, and the sewn part a121 of the fabric a12 can also be well unfolded and tensioned. Then, it is transported by the automatically controlled second drive motor a51, which allows the fabric a12 and the chain teeth a11 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 sewn joint between the chain teeth a11 and the fabric a12.

[0130] Furthermore, a first sensor a55 is provided on the guide rail a53, which is connected to the controller a6. The first sensor a55 divides the sliding stroke of the bracket a54 along the guide rail a53 into a preparation section and a sewing section. The controller a6 can independently control the second drive motor a51 to drive the bracket a54 and the clamping plate a52 to move rapidly in the preparation section. When the bracket a54 triggers the first sensor a55, the first sensor a55 sends a first signal to the controller a6. After receiving the first signal from the first sensor a55, the controller a6 controls the first drive motor a31 and the second drive motor a51 to rotate synchronously, so that the fabric a12 and the chain teeth a11 pass through the sewing head a2 at the same speed in the sewing section to achieve sewing.

[0131] The distance the bracket a54, carrying the clamp a52, moves forward along the guide rail a53 is controlled by the controller a6. 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 a23. Furthermore, control can also be achieved using a sensor mounted on the guide rail a53. A second sensor a56, connected to the controller a6, is mounted on the guide rail a53 and positioned behind the first sensor a55. This second sensor detects the maximum backward travel position of the bracket a54. After the bracket a54, carrying the clamp a52, passes the suture head a2, the second sensor a56 is triggered, sending a second signal to the controller a6. Upon receiving the second signal from the first sensor a55, the controller a6 controls both the first drive motor a31 and the second drive motor a51 to pause rotation.

[0132] Furthermore, the controller can also control the second drive motor a51 to drive the bracket a54 and clamp a52 to perform a backward movement. Specific control methods include at least the following: First, using a timer, after the controller controls the first drive motor a31 and the second drive motor a51 to rotate synchronously for a predetermined step length, the controller controls the second drive motor a51 to rotate in the opposite direction after a set time period. Second, using a button or sensor, the button or sensor being connected to the controller. When the button or sensor is triggered, it sends a backward signal to the controller. Upon receiving the backward signal, the controller controls the second drive motor a51 to rotate in the opposite direction. The sensor referred to here can be the second sensor a56 mentioned above.

[0133] As shown in Figures 15 and 17, the chain tooth guiding device a4 has a chain tooth guiding groove a41 including a bottom wall a411 and two side walls (i.e., a left side wall a412 and a right side wall a413). The bottom wall a411, the left side wall a412, and the right side wall a413 define a cavity a410. The chain tooth moves by passing through the cavity a410 and along the extending direction of the groove a41. In this embodiment, a downwardly extending connecting post is provided on the sewing machine head a2. This connecting post can move up and down, and the rear end of the cover plate a42 is connected to the connecting post so that it can move up and down with the connecting post. The width of the cover plate a42 is not greater than the width of the chain tooth guide groove a41 (the width of the chain tooth guide groove a41 refers to the maximum width of the outer sidewalls of the left groove sidewall a412 and the right groove sidewall a413). When the cover plate a42 moves closer to the chain tooth guide groove a41, a fabric passage gap is left between the cover plate a42 and the two groove sidewalls of the chain tooth guide groove a41, and the sewing part a121 can extend into the underside of the cover plate a42 through the fabric passage gap.

[0134] The chain guide groove a41 is further provided with a left wing plate a43 and a right wing plate a44 on both sides, respectively. The upper surfaces of the left wing plate a43 and the right wing plate a44 are respectively below the upper surfaces of the left groove sidewall a412 and the right groove sidewall a413. The left wing plate a43 and the right wing plate a44 can respectively support the passing clamping plate a52. The front ends of the left wing plate a43 and the right wing plate a44 are also provided with chamfers to facilitate the smooth sliding of the clamping plate a52 onto the left wing plate a43 and the right wing plate a44.

[0135] A guide section a422 is provided at the front end of the cover plate a42, at least part of the guide section a422 extends forward beyond the chain tooth guide groove a41, and a chamfer is provided at the front end of the guide section a422 on the side facing the chain tooth guide groove a41.

[0136] The guide section a422 is also provided with a through hole a423 that extends vertically. A roller a424 is rotatably disposed in the through hole a423. At least a portion of the roller a424 protrudes downward beyond the lower surface of the guide section a422, and at least a portion of the roller a424 protrudes forward beyond the chain tooth guide groove a41.

Claims

1. A chain sewing device, comprising: The frame (10) and the sewing head (20), fabric conveying device (30) and chain tooth traction device (40) respectively disposed on the frame (10); The frame (10) is provided with a worktable (M), and the sewing head (20) includes a sewing needle (21) corresponding to the worktable (M); The fabric conveying device (30) includes a clamp (33) for carrying and tensioning the fabric, the clamp (33) being movable in a first direction for conveying the fabric to the workbench (M); The chain tooth traction device (40) is used to feed chain teeth to the worktable (M) along the first direction; The fabric conveying device (30) and the chain tooth traction device (40) can convey the fabric synchronously.

2. The chain stitching device according to claim 1, wherein, The chain sewing equipment also includes a controller (50), which is signal-connected to the fabric conveying device (30), the chain tooth traction device (40) and the sewing head (20) respectively, for controlling the fabric conveying device (30) and the chain tooth traction device (40) to convey synchronously, and controlling the sewing head (20) to sew the chain teeth and the fabric at the worktable (M).

3. The chain stitching device according to claim 2, wherein, The chain tooth traction device (40) includes a first drive motor (41), and the fabric conveying device (30) includes a second drive motor (31); The controller (50) is signal connected to the first drive motor (41) and the second drive motor (31) respectively, and is used to control the first drive motor (41) and the second drive motor (31) to rotate synchronously by a preset step length, and to make the fabric conveying device (30) and the chain tooth traction device (40) convey synchronously.

4. The chain stitching device according to claim 3, wherein, The preset step length is equal to the predetermined pitch at which the fabric and the chain teeth move synchronously. 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.

5. The chain stitching device according to claim 3 or 4, wherein, The chain sewing equipment also includes a needle sensor (83), which is located on the sewing machine head (20) and is used to detect the lifting action of the needle (21). The needle sensor (83) is connected to the controller (50) via signal. The controller (50) is used to control the first drive motor (41) and the second drive motor (31) to rotate synchronously by a preset step length when the suture needle (21) is received from the suture needle sensor (83) to lift the suture needle (21), and to control the suture needle (21) to complete the puncture action after a first preset time.

6. The chain stitching device according to claim 5, wherein, The controller (50) includes a pulse signal generator, which is used to send the same predetermined number of pulse signals to the first drive motor (41) and the second drive motor (31) simultaneously through the pulse signal generator to control the first drive motor (41) and the second drive motor (31) to rotate synchronously by a predetermined step. And / or, the controller (50) further includes a timer, which times the synchronous rotation of the first drive motor (41) and the second drive motor (31) by means of the timer, and controls the first drive motor (41) and the second drive motor (31) to pause synchronously for the first preset time after the synchronous rotation time reaches the second preset time.

7. The chain stitching device according to claim 5, wherein, The suture head (20) includes a suture motor (22) and a needle mounting post (23); The main body of the sewing motor (22) is connected to the frame (10), the needle mounting post (23) is movably disposed on the main body of the sewing motor (22) along the second direction, and the needle (21) is detachably disposed on the first end of the needle mounting post (23). The second direction is perpendicular to the first direction. The output end of the sewing motor (22) is connected to the needle mounting post (23) so that the second end of the needle mounting post (23) can contact or separate from the needle sensor (83), and the first end of the needle mounting post (23) can drive the needle (21) to move closer to or away from the worktable (M).

8. The chain stitching device according to claim 3 or 4, wherein, The fabric conveying device (30) also includes a bracket (32); The clamp (33) is provided on the bracket (32); The bracket (32) is slidably connected to the frame (10) along the first direction; The second drive motor (31) is connected to the bracket (32) for driving the bracket (32) to move along the first direction.

9. The chain stitching device according to claim 8, wherein, The frame (10) is provided with a guide rail (11) extending along the first direction, and the bracket (32) is slidably connected to the guide rail (11); The chain sewing device also includes a controller (50) and a first sensor (81). The first sensor (81) is located on the guide rail (11) and is signal-connected to the controller (50). The bracket (32) may be provided with a trigger (82), which is used to trigger the first sensor (81). The second drive motor (31) is signal-connected to the controller (50).

10. The chain stitching device according to claim 9, wherein, The guide rail (11) is divided into a preparation section (11a) and a suturing section (11b) by the first sensor (81). Along the first direction, the preparation section (11a) is located downstream of the suturing section (11b). When the trigger (82) corresponds to the preparation section (11a), the controller (50) controls the second drive motor (31) to drive the bracket (32) to slide at a first speed; When the trigger (82) corresponds to the suture segment (11b), the controller (50) controls the first drive motor (41) and the second drive motor (31) to rotate synchronously, and drives the bracket (32) to slide intermittently at a second speed through the second drive motor (32), and the second speed is less than the first speed.

11. The chain stitching device according to claim 8, wherein, The clamp (33) is detachably mounted on the bracket (32).

12. The chain stitching device according to claim 3 or 4, wherein, The chain tooth traction device (40) also includes a traction wheel (42) and a pressure wheel (43); The traction wheel (42) and the clamping wheel (43) are arranged along a second direction for clamping the chain teeth, wherein the second direction is perpendicular to the first direction; The first drive motor (41) is connected to the traction wheel (42) in a transmission connection.

13. The chain stitching device according to claim 12, wherein, The outer peripheral wall of the traction wheel (42) is provided with an annular groove (421), which is used to accommodate the chain teeth.

14. The chain stitching device according to claim 1, wherein, The chain sewing equipment also includes a chain tooth guide device (60), which is located on the worktable (M); The chain tooth guide device (60) is provided with a guide space extending along the first direction, the guide space being used to pass through the chain tooth.

15. The chain stitching device according to claim 14, wherein, The chain tooth guide device (60) includes a base (61) and a cover plate (62); The base (61) is provided on the workbench (M), and the surface of the base (61) facing the sewing needle (21) is provided with a chain tooth guide groove (611), which extends along the first direction; The cover plate (62) is located at the opening of the chain tooth guide groove (611). The cover plate (62) can be close to or far away from the opening, and the cover plate (62) is provided with a clearance hole (621) for the needle (21) to pass through.

16. The chain stitching device according to claim 15, wherein, The width of the cover plate (62) is less than or equal to the width of the chain tooth guide groove (611) so that a fabric passage gap is formed between the cover plate (62) and the side wall of the chain tooth guide groove (611).

17. The chain stitching device according to claim 15, wherein, The cover plate (62) has a guide section (622) with a through hole (6221) and a roller (63) inside the through hole (6221). At least a portion of the roller (63) protrudes from the surface of the guide section (622) facing the chain tooth guide groove (611).

18. The chain stitching device according to claim 1, wherein, The chain stitching device also includes a storage device (70) and a guide wheel (91); The storage device (70) is used to store the strip-shaped chain teeth; The guide wheel (91) is located between the chain tooth traction device (40) and the storage device (70) and is used to guide the movement of the chain teeth.

19. 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 comprising 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 capable of moving 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.

20. The chain stitching device according to claim 19, 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.

21. The chain stitching device according to claim 19, 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.

22. The chain stitching device according to claim 19, 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.

23. The chain stitching device according to any one of claims 19 to 22, 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.

24. The chain stitching device according to claim 23, wherein, The needle sensor is located on the side of the needle mounting post to detect the movement of the needle mounting post.

25. The chain stitching device according to any one of claims 19 to 22, 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.

26. The chain stitching device according to claim 25, wherein, The clamp is detachably connected to the bracket.

27. The chain stitching device according to claim 25, 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.

28. The chain stitching device according to any one of claims 19 to 22, 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.

29. The chain stitching device according to claim 28, wherein, The frame is also equipped with a chain tooth storage device and a guide wheel. The chain tooth storage device is used to store the chain teeth arranged in a strip, and the guide wheel is arranged between the traction wheel and the chain tooth storage device to guide the chain teeth to move toward the traction wheel.

30. The chain stitching device according to any one of claims 19 to 22, 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.

31. The chain stitching device according to claim 30, 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.

32. The chain stitching device according to claim 30, 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.

33. The chain stitching device according to claim 32, 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.

34. The chain stitching device according to claim 32, wherein, The front ends of the left and right wing plates are also provided with chamfers.

Images