A sewing apparatus for a zipper fly

Abstract

The application relates to a sewing device for a zipper fly of a pair of trousers, which comprises a rack, a workbench arranged on the rack, a placing station and a sewing station arranged on the workbench, a sewing machine installed on the workbench and used for twice sewing of the trousers and the zipper of the sewing station, a Y-axis sliding platform arranged on the workbench and provided with a support, a feeding mechanism arranged on the rack and used for feeding the trousers and the zipper of the placing station to the sewing station, a pressing frame slidingly connected to the support and used for pressing the trousers of the sewing station, a first pressing mechanism arranged on the pressing frame and used for pressing the position of the zipper on the trousers during the first time of sewing, a folding mechanism arranged on the pressing frame and used for folding the zipper after the first time of sewing, and a second pressing mechanism arranged on the pressing frame and used for pressing the position of the zipper on the trousers during the second time of sewing. The mechanisms work cooperatively, the sewing process is ensured to be consecutive, and the overall production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment, and in particular to a sewing device for zipper plackets. Background Technology

[0002] A zipper placket is a functional and decorative structure in clothing, bags, and other products, with a zipper as the core closure component. Its main function is to enable opening and closing and secure product openings. It is widely used in clothing (such as jeans and jackets), bags (such as backpacks and suitcases), and home furnishings (such as cushions and sleeping bags), and is one of the most common closure designs in modern textiles and bag products.

[0003] Zipper flyes often use a double-stitched method. The first stitch is a straight stitch along the inside of the folded edge to fix the zipper to the folded edge. The second stitch is a straight stitch along the outside edge of the folded edge, where the stitches are exposed, serving both a reinforcement and decorative purpose (such as the double-needle topstitching on denim flyes).

[0004] Currently, the implementation of double-layer sewing technology still relies heavily on manual operation of sewing machines. During the sewing process, the sewing machine is often operated manually. The operator needs to perform multiple precise operations such as pressing, folding, and pushing, which makes it difficult to guarantee the consistency of manual operation. The production quality of zipper plackets is affected by factors such as the operator's experience, hand stability, and fatigue. Utility Model Content

[0005] To improve the sewing quality of zipper plackets, this application provides a sewing device for zipper plackets.

[0006] The sewing device for zipper plackets provided in this application adopts the following technical solution: A sewing device for zipper plackets includes a frame, a work platform mounted on the frame, a placement station and a sewing station configured on the work platform, and further includes: A sewing machine, mounted on a work platform, is used to sew trousers and zippers together twice at the sewing station. The Y-axis sliding platform is mounted on the work platform and is equipped with a support. The feeding mechanism, which is mounted on the frame, is used to deliver the trouser fabric and zipper placed at the workstation to the sewing station; The pressing frame, which is slidably connected to the bracket along the Z-axis, is used to press the trouser fabric at the sewing station; The first pressing mechanism, which is mounted on the pressing frame, is used to press the position of the zipper on the trouser fabric during a single sewing process; The folding mechanism, mounted on the pressing frame, is used to fold the zipper after one stitch. and a second pressing mechanism, which is mounted on the pressing frame and configured to press the position of the zipper on the pant fabric during secondary sewing.

[0007] Preferably, the feeding mechanism comprises a positioning pressing bar, a moving plate, a sliding seat, a Z-axis cylinder, an X-axis cylinder and a driving assembly, wherein the sliding seat is slidably connected to the working platform along the Y-axis direction, the driving assembly is configured to drive the sliding seat to slide, the moving plate is slidably connected to the sliding seat along the Z-axis direction, the Z-axis cylinder is arranged on the sliding seat, and one end of a piston rod of the Z-axis cylinder is arranged on the moving plate, the positioning pressing bar is slidably connected to the moving plate along the X-axis direction, the X-axis cylinder is arranged on the moving plate, and one end of a piston rod of the X-axis cylinder is arranged on the positioning pressing bar.

[0008] Preferably, the pressing frame is arranged in a square shape, an operation space for the operation of the sewing machine head is formed inside the pressing frame, a needle of the sewing machine head is located in a central working area of the square frame, a pressing cylinder is arranged on the pressing frame, and one end of a piston rod of the pressing cylinder is fixedly connected to the support.

[0009] Preferably, the first pressing mechanism comprises a primary pressing bar, a moving block, a first cylinder and a second cylinder, the moving block is slidably connected to the support along the X-axis direction, the first cylinder is arranged on the moving block, one end of a piston rod of the first cylinder is arranged on the support, the primary pressing bar is slidably connected to the moving block along the Z-axis direction, the second cylinder is arranged on the primary pressing bar, and one end of a piston rod of the second cylinder is arranged on the moving block.

[0010] Preferably, a first limiting groove is formed on the primary pressing bar, the width of the first limiting groove is adapted to the diameter of the needle of the sewing machine head, and the length of the first limiting groove covers the working stroke of primary sewing, allowing the needle of the sewing machine head to pass through and move for suturing.

[0011] Preferably, the folding mechanism comprises an air injection pipe communicated with an air source, the air injection pipe is arranged on the pressing frame, a plurality of air injection openings are uniformly formed on the air injection pipe along the axial direction thereof, when the pressing frame presses the pant fabric, the plurality of air injection openings face the to-be-folded edge of the zipper.

[0012] Preferably, the second pressing mechanism comprises a secondary pressing bar, a sliding plate, a third cylinder and a fourth cylinder, the sliding plate is slidably connected to the pressing frame along the X-axis direction, the third cylinder is arranged on the pressing frame, and one end of a piston rod of the third cylinder is arranged on the sliding plate, the secondary pressing bar is slidably connected to the sliding plate along the Z-axis direction, the fourth cylinder is arranged on the sliding plate, and a piston rod of the fourth cylinder is arranged on the secondary pressing bar.

[0013] Preferably, a second limiting groove is formed on the secondary pressing bar, the width of the second limiting groove is adapted to the diameter of the needle of the sewing machine head, and the length of the second limiting groove covers the working stroke of secondary sewing, allowing the needle of the sewing machine head to pass through and move for suturing.

[0014] The main technical effects of this utility model are reflected in the following aspects: 1. This utility model integrates automated mechanisms such as feeding, pressing, double sewing, and folding, transforming multiple manual operations into a continuous process, significantly shortening the processing time per piece, reducing manual intervention, and significantly improving the efficiency of mass production; it uses mechanical structures to achieve precise positioning and stable pressing of the zipper and trouser fabric, combined with programmed sewing paths, to ensure that the sewing position and stitch direction of each product are consistent, reducing the defect rate caused by human error; 2. This utility model can be flexibly adjusted in the X and Z axes through the first pressing mechanism, which can adapt to zippers and trouser fabrics of different specifications, accurately press the zipper in the position during one stitch, and ensure the accuracy of the one stitch position; fix the zipper during one stitch to prevent the zipper from shifting during the stitching process, and ensure the accuracy of one stitch. 3. This utility model uses an air jet to fold the zipper, which is gentle and will not damage the zipper or the trouser fabric. It also has high folding efficiency and good consistency. It realizes the automatic folding of the zipper after the first sewing, preparing for the second sewing, replacing manual folding and improving the degree of automation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0016] Figure 2 This is a schematic diagram of the working platform structure in an embodiment of this application.

[0017] Figure 3 along Figure 2 Enlarged view of point A in the middle.

[0018] Figure 4 This is a schematic diagram of the pressing frame structure according to an embodiment of this application.

[0019] Figure 5 This is a schematic diagram of the second pressing mechanism in an embodiment of this application.

[0020] Figure 6 This is a schematic diagram of the pressing frame installation structure according to an embodiment of this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Working platform; 21. Placement station; 22. Sewing station; 3. Pressing cylinder; 4. Pressing frame; 5. Feeding mechanism; 6. Positioning pressure strip; 7. Moving plate; 8. Sliding seat; 9. Z-axis cylinder; 10. X-axis cylinder; 11. Drive assembly; 12. Second motor; 13. Second lead screw; 14. Slide rail; 15. First pressing mechanism; 16. Primary pressing strip; 17. Moving block; 18. 19. First cylinder; 20. Second cylinder; 21. First limiting groove; 22. Folding mechanism; 23. Air pipe; 24. Air source; 25. Air nozzle; 26. Second pressing mechanism; 27. Secondary pressing strip; 28. Sliding plate; 29. ​​Third cylinder; 20. Fourth cylinder; 31. Second limiting groove; 32. Controller; 33. Y-axis sliding platform; 34. Slide plate; 35. Bracket; 36. Sewing machine head; 37. Mounting box. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0023] This application discloses a sewing device for zipper plackets.

[0024] Reference Figure 1 and Figure 2 This embodiment of a sewing device for zipper placket includes a frame 1, a work platform 2 fixedly connected to the frame 1, a placement station 21 and a sewing station 22 configured on the work platform 2, and a sewing machine installed on the work platform 2 for sewing the trouser fabric and zipper on the sewing station 22 twice. Reference Figure 1 It also includes a Y-axis sliding platform 32, which includes several slide plates 33, a first motor, and a first lead screw. The slide plates 33 are distributed sequentially along the thickness direction of the working platform 2. The bottom slide plate 33 is fixedly connected to the working platform 2, and the remaining slide plates 33 are slidably connected to the slide plates 33 located below it in sequence. A bracket 34 is fixedly connected to the top slide plate 33. A nut seat is fixedly connected to the bottom surface of the top slide plate 33. The first lead screw is rotatably connected to the bottom of the working platform 2 and is threaded through and connected to the nut seat. The first motor is fixedly connected to the bottom of the working platform 2 and is used to drive the rotation of the first lead screw.

[0025] Reference Figure 1, the first motor is started to drive the first lead screw to rotate. The first lead screw converts rotary motion into linear motion of the uppermost sliding plate 33 through threaded fit with the nut seat of the uppermost sliding plate 33. When the uppermost sliding plate 33 moves, it drives the lower sliding plate 33 slidably connected thereto to move sequentially, realizing stable overall movement along the Y-axis direction, including driving the bracket 34 and related mechanisms to accurately move to the target position.

[0026] With reference to Figure 2 and Figure 3 , the present device further comprises a feeding mechanism 5, which is mounted on the frame 1 and used for feeding the pant fabric and zipper on the placement station 21 to the sewing station 22. The feeding mechanism 5 comprises a positioning pressing strip 6, a moving plate 7, a sliding seat 8, a Z-axis cylinder 9, an X-axis cylinder 10 and a driving assembly 11. The sliding seat 8 is slidably connected to the working platform 2 along the Y-axis direction, the driving assembly 11 is used for driving the sliding of the sliding seat 8, and the driving assembly 11 comprises a second motor 12, a second lead screw 13 and a slide rail 14. An installation box 36 is fixedly connected to the working platform 2, the slide rail 14 is fixedly connected in the installation box 36, the sliding seat 8 is slidably connected on the slide rail 14, the second lead screw 13 is rotatably connected in the installation box 36 along the Y-axis direction, the second lead screw 13 penetrates and is in threaded connection with the sliding seat 8, the second motor 12 is fixedly connected on the installation box 36, the second motor 12 is used for driving the rotation of the second lead screw 13, the moving plate 7 is slidably connected to the sliding seat 8 along the Z-axis direction, one end of the sliding plate 27 penetrates to the outside of the installation box 36, the Z-axis cylinder 9 is arranged on the sliding seat 8, one end of its piston rod is arranged on the sliding plate 27, the positioning pressing strip 6 is slidably connected to the moving plate 7 along the X-axis direction, the X-axis cylinder 10 is arranged on the sliding plate 27, and one end of its piston rod is arranged on the positioning pressing strip 6.

[0027] With reference to Figure 3 , the driving assembly 11 drives the sliding seat 8 to slide along the Y-axis direction; the Z-axis cylinder 9 drives the moving plate 7 to move up and down along the Z-axis direction, and adjusts the height of the moving plate 7 to adapt to materials; the X-axis cylinder 10 drives the positioning pressing strip 6 to slide along the X-axis direction. In the whole process, accurate transferring is realized through lead screw transmission driven by a motor, and reliable clamping and releasing of materials are realized by matching with the positioning pressing strip 6 driven by a cylinder, so as to complete the automatic operation of transferring materials from the placement station 21 to the sewing station 22, and provide a stable material positioning foundation for the subsequent sewing process.

[0028] With reference to Figure 4 and Figure 5 , the present device further comprises a pressing frame 4, which is slidably connected to the bracket 34 along the Z-axis direction and used for pressing the pant fabric on the sewing station 22. The pressing frame 4 is arranged in a square shape, an operation space for the sewing head 35 to work is formed inside the pressing frame, the needle of the sewing head 35 is located in the central working area of the square frame, a pressing cylinder 3 is arranged on the pressing frame 4, and one end of the piston rod of the pressing cylinder is fixedly connected to the bracket 34.

[0029] Reference Figure 4 and Figure 5 When the material is delivered to the sewing station 22, the piston rod of the pressing cylinder 3 extends and retracts, driving the pressing frame 4 to move downward along the Z-axis to press and fix the trouser fabric. The sewing machine head 35 performs the sewing operation in the central working area inside the "U"-shaped frame, and the pressing frame 4 maintains pressure on the trouser fabric during the sewing process. The "U"-shaped pressing frame 4 structure avoids interference between the pressing frame 4 and the sewing machine head 35, reducing the risk of equipment failure. The frame applies even pressure to the trouser fabric, preventing localized wrinkling of the fabric and ensuring the smoothness of the sewing. The frame does not obstruct the sewing area, making it convenient for operators to observe the sewing status and handle abnormalities in a timely manner.

[0030] Reference Figure 4 and Figure 6 It also includes a first pressing mechanism 15, which is installed on the pressing frame 4 and is used to press the position of the zipper on the trouser fabric during one sewing operation. The first pressing mechanism 15 includes a primary pressing strip 16, a moving block 17, a first cylinder 18, and a second cylinder 19. The moving block 17 is slidably connected to the bracket 34 along the X-axis direction. The first cylinder 18 is fixedly connected to the moving block 17, and one end of its piston rod is fixedly connected to the bracket 34. The primary pressing strip 16 is slidably connected to the moving block 17 along the Z-axis direction. The second cylinder 19 is fixedly connected to the primary pressing strip 16, and one end of its piston rod is fixedly connected to the moving block 17. A first limiting groove 20 is provided on the primary pressing strip 16. The width of the first limiting groove 20 is adapted to the needle diameter of the sewing machine head 35, and its length covers the working stroke of one sewing operation, allowing the needle of the sewing machine head 35 to pass through and the sewing thread to travel.

[0031] Reference Figure 4 and Figure 6 The first cylinder 18 drives the moving block 17 to slide along the X-axis, adjusting the position of the primary pressure strip 16 in the X-axis direction. The second cylinder 19 drives the primary pressure strip 16 to move up and down along the Z-axis. When it is necessary to fix the zipper, the primary pressure strip 16 moves downward to press down on the zipper, maintaining the pressed state during the first stitch of the sewing machine. After the stitch is completed, it moves upward to release. This fixes the zipper during the first stitch, preventing it from shifting during the stitching process and ensuring the accuracy of the first stitch.

[0032] Reference Figure 4 and Figure 6 The first limiting groove 20 is adapted to the diameter of the needle and covers one sewing stroke. It provides a channel for the needle to pass through and the thread to travel, while limiting the sewing range of the needle to ensure that the sewing line is neat. After the first pressing strip 16 presses down on the zipper, the needle passes through the first limiting groove 20 to sew the zipper and the trouser fabric. During the sewing process, the needle moves along the length of the first limiting groove 20 to complete one sewing stroke.

[0033] Reference Figure 5 and Figure 6 It also includes a folding mechanism 211, which is installed on the pressing frame 4 and is used to fold the zipper after one stitch. The folding mechanism 211 includes an air pipe 221 connected to an air source 23. The air source 23 is a turbine air pump, which is fixedly connected to the frame 1. The air pipe 221 is fixedly connected to the pressing frame 4. The air pipe 221 has a number of air nozzles 24 evenly opened along its axis. When the pressing frame 4 presses the trousers, the number of air nozzles 24 are directly facing the edge of the zipper to be folded.

[0034] Reference Figure 5 and Figure 6 When the pressing frame 4 presses the trouser fabric together, the air jet pipe 221 is connected to the air source 23, and gas is ejected from several air jet nozzles 24. The air jet nozzles 24 are directly facing the edge of the zipper to be folded, and the gas pressure is used to fold the edge of the zipper to the preset position. This achieves automatic folding of the zipper after the first stitch, preparing it for the second stitch, replacing manual folding and improving the degree of automation. Moreover, the air jet method for folding the zipper is gentle and will not damage the zipper or the trouser fabric, and the folding efficiency is high and the consistency is good.

[0035] Reference Figure 5 and Figure 6 The system also includes a second pressing mechanism 25, which is mounted on the pressing frame 4 and used to press the zipper on the trouser fabric during secondary sewing. The second pressing mechanism 25 includes a secondary pressing strip 26, a sliding plate 27, two third cylinders 28, and two fourth cylinders 29. The sliding plate 27 is slidably connected to the pressing frame 4 along the X-axis. The two third cylinders 28 are fixedly connected to the pressing frame 4, and one end of their piston rods is fixedly connected to the sliding plate 27. The secondary pressing strip 26 is slidably connected to the sliding plate 27 along the Z-axis. The two fourth cylinders 29 are fixedly connected to the sliding plate 27, and their piston rods are fixedly connected to the secondary pressing strip 26. A second limiting groove 30 is provided on the secondary pressing strip 26. The width of the second limiting groove 30 is adapted to the needle diameter of the sewing machine head 35, and its length covers the working stroke of the secondary sewing, allowing the needle of the sewing machine head 35 to pass through and the thread to travel.

[0036] Reference Figure 5 and Figure 6 The third cylinder 28 drives the sliding plate 27 to slide along the X-axis, adjusting the position of the secondary pressure strip 26 in the X-axis direction. The fourth cylinder 29 drives the secondary pressure strip 26 to move up and down along the Z-axis. When it is necessary to fix the folded zipper, the secondary pressure strip 26 moves downward to press the zipper, maintaining the pressed state during the secondary sewing process. After sewing is completed, it moves upward to release. The second pressing mechanism 25 is adjustable in both the X and Z axes, adapting to the position of the folded zipper and precisely pressing the zipper in the position during secondary sewing to ensure the quality of the secondary sewing.

[0037] Reference Figure 5 and Figure 6 After the secondary sealing strip 26 presses down on the folded zipper, the needle passes through the second limiting groove 30 to perform a secondary stitching between the zipper and the trouser fabric. The needle moves along the length of the second limiting groove 30, guiding it to perform the secondary stitching, preventing it from deviating from the preset path, ensuring the accuracy of the secondary stitching, and completing the secondary stitching process. The second limiting groove 30 provides guidance and restriction for the needle's secondary stitching, ensuring neat stitch lines and working in conjunction with the primary stitching to create a high-quality zipper placket stitching effect.

[0038] Reference Figure 1 It also includes a controller 31, which is installed on the work platform 2. The controller 31 is used to receive signals from each motor, cylinder and sewing machine head 35, and control the opening and closing, forward and reverse rotation and movement sequence of each motor, cylinder and sewing machine head 35.

[0039] Reference Figure 1 and Figure 2 By integrating automated mechanisms such as feeding, pressing, double sewing, and folding, multiple manual operations are integrated into a continuous process, significantly shortening the processing time of a single piece, reducing manual intervention, and significantly improving the efficiency of mass production. The mechanical structure enables precise positioning and stable pressing of the zipper and trouser fabric, and combined with a programmed sewing path, it ensures that the sewing position and stitch direction of each product are consistent, reducing the defect rate caused by human error.

[0040] Reference Figure 1 and Figure 2 In summary, the sewing process between the trouser fabric and the zipper using this equipment is as follows: S1 Material Placement and Feeding: The operator places the trousers and zipper on the placement station 21 of the work platform 2; the controller 31 starts the feeding mechanism 5, the X-axis cylinder 10 drives the positioning pressure strip 6 to move along the X-axis direction, so that the positioning pressure strip 6 approaches the material; the Z-axis cylinder 9 drives the moving plate 7 to move down along the Z-axis direction to clamp the trousers and zipper on the placement station 21; the second motor 12 of the drive assembly 11 works, and drives the sliding seat 8 to slide along the slide rail 14 in the Y-axis direction through the second lead screw 13, after which the clamped trousers and zipper are transferred to the sewing station 22, and the positioning pressure strip 6 releases the material.

[0041] S2 First Sewing: The piston rod of the pressing cylinder 3 extends and retracts, driving the pressing frame 4 to move downwards along the Z-axis, pressing and fixing the trouser fabric on the sewing station 22; the first cylinder 18 drives the moving block 17 to slide along the X-axis, adjusting the position of the primary pressing strip 16; the second cylinder 19 drives the primary pressing strip 16 to move downwards along the Z-axis, pressing down the zipper. At this time, the first limiting groove 20 of the primary pressing strip 16 is aligned with the needle path of the sewing machine head 35. The sewing machine starts, and the needle passes through the first limiting groove 20 to sew the zipper and trouser fabric once. At the same time, the Y-axis sliding platform 32 moves and drives the pressing frame 4, as well as the zipper and trouser fabric, to move, so that the needle completes one sewing stroke along the length of the first limiting groove 20. After sewing, the Y-axis sliding platform 32 moves and drives the pressing frame 4, as well as the zipper and trouser fabric, to reset. S3 Zipper Folding: The jet nozzle 24 of the jet pipe 221 is directly facing the edge of the zipper to be folded; the controller 31 controls the jet nozzle 24 of the jet pipe 221 to spray air, using the airflow to push the zipper to fold along the first stitch line; after the folding is completed, the jetting stops, and the zipper remains in the folded state; the second cylinder 19 retracts, driving the first pressure strip 16 to reset, and the first cylinder 18 drives the moving block 17 to return to the initial position; S4 Secondary Sewing: The third cylinder 28 of the second pressing mechanism 25 drives the sliding plate 27 to slide along the X-axis, adjusting the position of the secondary pressing strip 26; the fourth cylinder 29 drives the secondary pressing strip 26 to move downward along the Z-axis, pressing down on the folded zipper. At this time, the second limiting groove 30 of the secondary pressing strip 26 is aligned with the secondary sewing path of the sewing needle. The sewing machine starts again, and the needle passes through the second limiting groove 30 to perform secondary sewing on the zipper and trouser fabric. At the same time, the Y-axis sliding platform 32 moves and drives the pressing frame 4, as well as the zipper and trouser fabric, to move, so that the needle moves along the length of the second limiting groove 30 to complete the secondary sewing stroke.

[0042] S5 Finished product removal: Pressing frame 4 moves upward and resets, Y-axis sliding platform 32 drives pressing frame 4 back to the initial position; operator removes the sewn finished product from sewing station 22 and checks whether the stitches are neat and whether the folding angle is qualified.

[0043] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A sewing device for zipper fly, comprising a rack (1), a work platform (2) is arranged on the rack (1), a placing station (21) and a sewing station (22) are arranged on the work platform (2), characterized in that, further comprising: a sewing machine, which is mounted on a working platform (2) and configured to perform two stitching operations on pants material and a zipper at a stitching station (22); a Y-axis sliding platform (32), which is arranged on the working platform (2) and provided with a support (34); a feeding mechanism (5), which is mounted on a frame (1) and configured to feed pants material and a zipper at a placement station (21) to the stitching station (22); a pressing frame (4), which is slidably connected to the support (34) along the Z-axis direction and configured to press the pants material at the stitching station (22); a first material pressing mechanism (15), which is mounted on the pressing frame (4) and configured to press the zipper at its position on the pants material during primary stitching; a folding mechanism (211), which is mounted on the pressing frame (4) and configured to fold the zipper after primary stitching; and a second material pressing mechanism (25), which is mounted on the pressing frame (4) and configured to press the zipper at its position on the pants material during secondary stitching.

2. The sewing device for a zipper placket according to claim 1, characterized in that: The feeding mechanism (5) comprises a positioning pressing bar (6), a moving plate (7), a sliding seat (8), a Z-axis cylinder (9), an X-axis cylinder (10) and a driving assembly (11), wherein the sliding seat (8) is slidably connected to the working platform (2) along the Y-axis direction, the driving assembly (11) is configured to drive the sliding seat (8) to slide, the moving plate (7) is slidably connected to the sliding seat (8) along the Z-axis direction, the Z-axis cylinder (9) is arranged on the sliding seat (8), and one end of a piston rod of the Z-axis cylinder is arranged on the moving plate (7), the positioning pressing bar (6) is slidably connected to the moving plate (7) along the X-axis direction, the X-axis cylinder (10) is arranged on the moving plate (7), and one end of a piston rod of the X-axis cylinder is arranged on the positioning pressing bar (6).

3. A sewing apparatus for a zipper fly according to claim 1, wherein: The pressing frame (4) is arranged in a shape of a square frame, an operation space for a sewing head (35) to work is formed inside the pressing frame (4), a needle of the sewing head (35) is located in a central working area of the square frame, a pressing cylinder (3) is arranged on the pressing frame (4), and one end of a piston rod of the pressing cylinder is fixedly connected to the support (34).

4. A sewing apparatus for a zipper fly according to claim 1, wherein: The first material pressing mechanism (15) comprises a primary pressing bar (16), a moving block (17), a first cylinder (18) and a second cylinder (19), wherein the moving block (17) is slidably connected to the support (34) along the X-axis direction, the first cylinder (18) is arranged on the moving block (17), and one end of a piston rod of the first cylinder is arranged on the support (34), the primary pressing bar (16) is slidably connected to the moving block (17) along the Z-axis direction, the second cylinder (19) is arranged on the primary pressing bar (16), and one end of a piston rod of the second cylinder is arranged on the moving block (17).

5. A sewing apparatus for a zipper fly according to claim 4, wherein: The primary pressing bar (16) is provided with a first limiting groove (20), a width of the first limiting groove (20) is adapted to a diameter of the needle of the sewing head (35), a length of the first limiting groove covers a working stroke of primary stitching, so that the needle of the sewing head (35) can penetrate through the first limiting groove and move for stitching.

6. A sewing apparatus for zipper flys as defined in claim 1 wherein: The folding mechanism (211) includes a jet pipe (221) connected to an air source (23). The jet pipe (221) is located on the pressing frame (4). A plurality of jet nozzles (24) are evenly provided on the jet pipe (221) along its axial direction. When the pressing frame (4) presses the trousers, the plurality of jet nozzles (24) are directly opposite the edge of the zipper to be folded.

7. A sewing apparatus for zipper flys as defined in claim 1 wherein: The second pressing mechanism (25) includes a secondary pressing strip (26), a sliding plate (27), a third cylinder (28), and a fourth cylinder (29). The sliding plate (27) is slidably connected to the pressing frame (4) along the X-axis direction. The third cylinder (28) is located on the pressing frame (4), and one end of its piston rod is located on the sliding plate (27). The secondary pressing strip (26) is slidably connected to the sliding plate (27) along the Z-axis direction. The fourth cylinder (29) is located on the sliding plate (27), and its piston rod is located on the secondary pressing strip (26).

8. A sewing apparatus for a zipper fly according to claim 7, wherein: The secondary pressure strip (26) is provided with a second limiting groove (30). The width of the second limiting groove (30) is adapted to the diameter of the needle of the sewing machine head (35), and its length covers the working stroke of the secondary sewing, so that the needle of the sewing machine head (35) can be inserted and the sewing thread can travel.

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