Cloth pressing device for patch pocket machine

Abstract

The cloth pressing device for the patch pocket machine is composed of an inner cloth pressing structure and an outer cloth pressing structure, the inner cloth pressing structure comprises an inner cloth pressing driving component and an inner pressing block component, and the outer cloth pressing structure is composed of a bottom frame and three or more outer cloth pressing modules fixed to the bottom frame. In the outer cloth pressing structure part, three or more outer cloth pressing modules can be selected according to the shape of pocket cloth, and a motor can be started to control the extending distance of outer pressing blocks in the outer cloth pressing modules according to the size of pocket cloth pieces. According to the inner cloth pressing structure part, the shapes of the outer pressing blocks can be selectively replaced according to the shapes of the pocket cloth pieces, and the number of the outer pressing blocks can be adjusted according to the sizes of the pocket cloth pieces. Different cloth pressing modules do not need to be manufactured according to different cloth piece shapes and sizes, the structure is simple, operation is convenient, and large-scale production is easy to achieve.

Description

Technical Field

[0001] This utility model belongs to the technical field of garment sewing devices, specifically relating to a fabric pressing device for a patch attaching machine. Background Technology

[0002] Automatic pocket sewing machines for garments, also known as patch pocket machines, have a wide range of applications, primarily in the apparel, home textile, footwear, and bag industries. The demand for sewing machines is particularly strong in the customization and fast fashion sectors. With the trends of industrialization, urbanization, and consumption upgrading, the market demand for sewing machines continues to increase.

[0003] Currently, in the garment pocket sewing industry, straight stitch and buttonhole stitch can be completed in one go, suitable for sewing various jeans back pockets, shirt pockets, and other irregularly shaped parts in garment processing. When the feeding device of the patch pocket machine feeds the folded pocket fabric piece onto the garment to be sewn, it is necessary to press and fix the garment to be sewn and limit the position of the pocket fabric piece. Otherwise, during the sewing process, the sewing position and shape of the garment are prone to change, causing problems such as skipped stitches, broken threads, and unqualified pocket sewing. Prior art document CN211897339U discloses an automatic pocket sewing device for clothing, including a sewing device body. The sewing device body has a pocket pressing plate and a fixing plate. The pocket pressing plate consists of an inner plate and an outer ring, and the outer ring of the pocket pressing plate has a first pressing plate and a second pressing plate. A connecting piece connects the inner plate and the outer ring of the pocket pressing plate. The fixing plate consists of an outer plate and an inner ring, and a connecting piece also connects the outer plate and the inner ring of the fixing plate. Connecting blocks are provided on the fixing plate, the first pressing plate, and the second pressing plate. This automatic pocket sewing device changes the size of the pocket by adjusting the length of the connecting piece between the pocket pressing plate and the fixing plate, facilitating multiple uses of a single plate and saving material resources. However, when using this technical solution to sew pockets of different shapes, different shaped pressing plates need to be replaced. Each time a pocket is replaced, a new pressing block template needs to be made, which is still relatively wasteful of material resources. Furthermore, this technical solution only fixes the pocket to be sewn, but does not fix the garment to be sewn, resulting in poor equipment versatility and hindering large-scale production. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a pressing device for a bag-sealing machine. In the outer pressing structure, three or more outer pressing modules can be selected based on the shape of the pocket fabric. A motor can be activated to control the extension distance of the outer pressing blocks within the outer pressing modules, depending on the size of the pocket fabric. In the inner pressing structure, the shape of the outer pressing blocks can be changed according to the shape of the pocket fabric, and the number of outer pressing blocks can be adjusted according to the size of the pocket fabric. This eliminates the need to manufacture different pressing modules for different fabric shapes and sizes, resulting in a simple structure, convenient operation, and ease of mass production.

[0005] The technical solution provided by this utility model is as follows;

[0006] A pressing device for a bag-applying machine comprises an inner pressing fabric structure and an outer pressing fabric structure. The inner pressing fabric structure includes an inner pressing fabric driving component and an inner pressing block component. The inner pressing fabric driving component consists of a first driving component and a second driving component. The inner pressing block component consists of a first front pressing block, a second front pressing block, a first rear pressing block, and a second rear pressing block. The first rear pressing block and the second rear pressing block are connected by guide rails, as are the second front pressing block and the second rear pressing block. The first front pressing block and the first rear pressing block are connected by guide rails at both ends. The first driving component is connected to the first rear pressing block and the second rear pressing block respectively, driving the first rear pressing block and the second rear pressing block to move left and right in a horizontal position. This causes the first and second front pressure blocks to move in the same direction. The second drive is connected to the second rear pressure block, causing the second rear pressure block to extend and retract in a horizontal position, which in turn causes the first rear pressure block, the first front pressure block, and the second front pressure block to move in the same direction. The outer pressure cloth structure consists of a base frame and three or more outer pressure cloth modules fixed on the base frame. The outer pressure cloth module includes an outer pressure cloth drive component, a transmission component, an adjusting rod, and an outer pressure block. The bottom of the transmission component is fixed on the base frame, and an adjusting rod is fixed on the top. The other end of the adjusting rod is connected to the outer pressure block. The outer pressure cloth drive component is connected to the transmission component, causing the adjusting rod to move back and forth.

[0007] Preferably, the first driving component includes a first closed-loop motor, a first threaded screw, a first gear, a bidirectional threaded screw, a second gear, a first fixed rod, and a second fixed rod. The first threaded screw is connected to the first closed-loop motor, the first gear is fixed on the first threaded screw, the first fixed rod is connected to the first rear pressure block, the second fixed rod is connected to the second rear pressure block, and both ends of the bidirectional threaded screw are connected to the first fixed rod and the second fixed rod, respectively. The second gear is connected to the bidirectional threaded screw, and the first gear and the second gear mesh. The second driving component includes a second closed-loop motor, a second threaded screw, a guide rod, and a connecting rod. One end of the connecting rod is connected to the guide rail between the first front pressure block and the second front pressure block, and the other end is connected to the guide rod. The guide rod is fixedly connected to the second threaded screw, and the second threaded screw is connected to the second closed-loop motor.

[0008] More preferably, the first closed-loop motor drives the first gear to rotate, and the first gear meshes with the second gear, driving the bidirectional spiral screw to rotate. One end of the bidirectional spiral screw has a clockwise thread and the other end has a counterclockwise thread. The first fixed rod and the second fixed rod have internal threads with opposite directions. Through the rotation of the bidirectional spiral screw, the first fixed rod and the second fixed rod achieve reverse synchronous movement under the meshing of the internal threads and the threads of the bidirectional spiral screw.

[0009] Preferably, a connecting block is also installed on the first front pressure block and the first rear pressure block, and a spring is provided between the connecting blocks. The first connecting shaft passes through the connecting block and is fixed by the spring. A connecting block is also installed on the second front pressure block and the second rear pressure block, and a spring is provided between the connecting blocks. The second connecting shaft passes through the connecting block and is fixed by the spring.

[0010] More preferably, it also includes a fixed base, through which the guide rod passes and is fixed, and through which the bidirectional threaded screw passes and is fixed, with the bidirectional threaded screw being arranged perpendicular to the guide rod.

[0011] Preferably, the transmission component consists of a base, a support plate, and a slide rail, and the external pressure cloth driving component consists of a motor and a screw rod. The base is fixed on the base frame, and a slide rail is installed on its top. The support plate is connected to the base through the slide rail. The motor is fixed on the base and connected to the screw rod. The screw rod is fixed to the support plate. The motor drives the screw rod to rotate, and the screw rod drives the support plate to slide back and forth along the slide rail on the base.

[0012] Preferably, one or more intermediate pressure blocks are provided between the first front pressure block and the first rear pressure block, and between the second front pressure block and the second rear pressure block.

[0013] Preferably, a slider is installed on the first front pressure block, the first rear pressure block, the second front pressure block, and the second rear pressure block. The top of the slider is provided with a groove, and dovetail grooves are provided on both sides of the guide rail along the length direction. A protruding structure is provided in the groove and installed in the dovetail groove, so that the slider can slide along the guide rail, thereby driving the first front pressure block, the first rear pressure block, the second front pressure block, and the second rear pressure block to perform back-and-forth telescopic movement along the guide rail.

[0014] Preferably, the base frame is provided with a number of mounting holes, and the mounting position of the external pressure cloth module on the base frame is adjustable; the number of adjusting rods in the external pressure cloth module can be one or more.

[0015] Preferably, the outer pressure block is provided with several connecting holes, and the two ends of the adjusting rod are provided with groove holes. The screw passes through the groove holes to connect the adjusting rod to the outer pressure block and the transmission device respectively. The position of the screw in the groove hole is adjustable.

[0016] Compared with the prior art, the present invention has the following technical advantages:

[0017] (1) To better secure the garments to be sewn and limit the pocket fabric pieces, this invention can be adjusted according to the shape and size of the pocket fabric pieces in the following ways: ① Three or more outer pressure cloth modules can be selected to tightly limit the pocket fabric pieces in all directions; ② The type of outer pressure block on the outer pressure cloth module can be changed according to the peripheral shape of the pocket fabric pieces; ③ The motor can be started to control the extension distance of the outer pressure block in the outer pressure cloth module, that is, to control the distance between the outer pressure block and the pocket fabric pieces, and the distribution distance between each outer pressure cloth module can also be adjusted; ④ Two or more adjusting rods are set, and the turning angle of the outer pressure block can be controlled by adjusting the connection position of the adjusting rod and the outer pressure block and the fixing position of the screw in the groove, so that the outer pressure block can better fit the pocket fabric pieces. This invention does not require the production of different outer pressure cloth modules for different fabric shapes and sizes. It has a simple structure, is easy to operate, has strong practicality, and is easy to achieve large-scale production.

[0018] (2) In the inner pressing fabric structure, this utility model abandons the use of a whole piece of pocket fabric fixing plate, and divides the fixing plate into multiple small pressing blocks. The shape of each pressing block can be selected according to the shape of the pocket fabric, and the number of pressing blocks can be selected according to the size of the fabric to be sewn. There is no need to replace the whole fixing plate. At the same time, this utility model is equipped with two closed-loop motors, which drive each pressing block to extend and retract in the left and right and front and back positions respectively. The distance between each pressing block can be adjusted according to the size of the pocket fabric to be sewn. It can be applied to pocket fabrics of various shapes and sizes to be sewn. There is no need to make different pocket pressing fabric fixing plates for different pocket fabric shapes and sizes. The structure is simple, the operation is convenient, the practicality is strong, and it is easy to realize mass production.

[0019] (3) In this utility model, one or more springs are provided between the inner pressure blocks. When the closed-loop motor controls the pressure blocks to retract, a buffer force is provided to reduce the wear between the pressure blocks. When the closed-loop motor controls the pressure blocks to unfold, the spring rebound force enables the pressure blocks to unfold quickly, responding promptly and increasing the sensitivity of equipment control.

[0020] (4) The present invention is easy to maintain in the later stage. The nuts can be unscrewed with tools and the various parts in the device can be separated accordingly, which makes it convenient to inspect the designated parts. There is no need to disassemble the whole machine, which saves the time and energy of the staff, reduces the difficulty of maintenance, and increases the convenience of using the device.

[0021] (5) This utility model uses the control of two motors to realize the forward and backward and left and right movement of each inner pressure block in the inner pressure block component, thereby realizing the enlargement and reduction of the entire inner pressure block assembly. By changing the shape of some inner pressure blocks, the shape of the entire inner pressure block assembly can be changed. Furthermore, the length and width of each inner pressure block can be controlled to change simultaneously, or one of the length or width can be controlled to change while the other remains unchanged, greatly increasing the flexibility and convenience of the entire operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the external pressure cloth module of this utility model.

[0024] Figure 3 This is a schematic diagram of the external pressure cloth module of this utility model.

[0025] Figure 4 This is a schematic diagram of the inner pressure fabric structure of this utility model.

[0026] Figure 5 This is a schematic diagram of the inner pressure fabric structure of this utility model.

[0027] Figure 6 This is a schematic diagram of the inner pressure fabric structure of this utility model.

[0028] The components include: 1. First front pressure block; 2. Second front pressure block; 3. First rear pressure block; 4. Second rear pressure block; 5. Middle pressure block; 6. Guide rail I; 7. Guide rail II; 8. Slider I; 9. Slider II; 10. Dovetail groove I; 11. Groove II; 12. Spring; 13. First connecting shaft; 14. Second connecting shaft; 15. First closed-loop motor; 16. First threaded screw; 17. First gear; 18. Bidirectional threaded screw; 19. Second gear; 20. First fixing rod; 21. Second closed-loop motor; 22. Second screw rod; 23. Guide rod; 24. Connecting rod; 25. Guide rail III; 26. Connecting block; 27. Fixed base; 28. Base frame; 29. ​​Motor; 30. Helical rod; 31. Base; 32. Support plate; 33. Slide rail; 34. Outer pressure block; 35. Adjusting rod; 36. Mounting hole; 37. Groove hole; 38. Connecting hole; 39. Screw; 40. Second fixing rod. Detailed Implementation

[0029] The present invention will now be further described in conjunction with specific embodiments and accompanying drawings.

[0030] like Figures 1-3As shown, this utility model discloses a pressing cloth device for a bag-applying machine, which consists of an inner pressing cloth structure and an outer pressing cloth structure. The outer pressing cloth structure consists of a base frame 28 and three outer pressing cloth modules fixed on the base frame 28. The base frame 28 is arranged in a "U" shape, and the outer pressing cloth modules are installed on the base frame 28 at equal intervals.

[0031] The outer pressure fabric module consists of an outer pressure fabric driving component, a transmission component, an adjusting rod 35, and an outer pressure block 34. The outer pressure fabric driving component consists of a motor 29 and a screw rod 30. The transmission component consists of a base 31, a support plate 32, and a slide rail 33. The base 31 is fixed on the base frame 28, and the slide rail 33 is installed on its top. The support plate 32 is connected to the base 31 through the slide rail 33. The motor 29 is fixed on the base 31 and connected to the screw rod 30. The screw rod 30 is fixed to the support plate 32. The motor 29 drives the screw rod 30 to rotate, and the screw rod 30 drives the support plate 32 to slide back and forth along the slide rail 33 on the base 31, thereby driving the outer pressure block 34 to move back and forth as well. An adjusting rod 35 is also fixed on the support plate 32. The other end of the adjusting rod 35 is connected to the outer pressure block 34. In this embodiment, two of the three outer pressure blocks 34 are in the shape of a "|", and the other is in the shape of a "<". In actual operation, the user can select according to the shape of the pocket fabric. The bottom of the outer pressure block 34 and the base 31 are on the same horizontal plane.

[0032] In this invention, the base frame 28 is provided with a plurality of mounting holes 36, and the mounting position of the outer pressure cloth module on the base frame 28 is adjustable. The outer pressure block 34 is provided with a plurality of connecting holes 38, and the two ends of the adjusting rod 35 are provided with recessed holes 37. Screws 39 pass through the recessed holes 37 to connect the adjusting rod 35 to the outer pressure block 34 and the support plate 32 respectively.

[0033] In addition, the number of adjusting rods 35 in the external pressure fabric module can be one or more. When the number of adjusting rods 35 is more than one, the shapes of the adjusting rods 35 can be the same or different.

[0034] like Figures 4-5 As shown, the inner pressure cloth structure of this utility model includes an inner pressure cloth driving component and an inner pressure block component. The inner pressure cloth driving component consists of a first driving component and a second driving component. The inner pressure block component consists of a first front pressure block 1, a second front pressure block 2, a first rear pressure block 3, a second rear pressure block 4, and four intermediate pressure blocks 5. Two intermediate pressure blocks 5 are respectively arranged between the first front pressure block 1 and the first rear pressure block 3, and between the second front pressure block 2 and the second rear pressure block 4.

[0035] The first rear pressure block 3, the first front pressure block 1, and the two intermediate pressure blocks 5 are connected in series via guide rail I6. The second rear pressure block 4, the second front pressure block 2, and the two intermediate pressure blocks 5 are connected in series via guide rail II7. Guide rail I6 and guide rail II7 are set parallel to each other. Slider I8 is installed on the first rear pressure block 3, the second front pressure block 2, the second rear pressure block 4, the first front pressure block 1, and the four intermediate pressure blocks 5. Dovetail grooves I10 are set on both sides of guide rail I6 along the length direction. A groove II11 is provided at the top center of slider I8. Long strip protrusions that match groove II11 are provided on both sides of the inside along the length direction. The long strip protrusions are stuck in the dovetail grooves I10 in guide rail I6, so that slider I8 can slide back and forth along guide rail I6. Similarly, dovetail grooves I10 are provided on both sides of guide rail II7 along the length direction, and groove II11 is provided at the top center of slider I8. Long strip protrusions are provided on both sides of groove II11 along the length direction. The long strip protrusions are stuck in the dovetail grooves I10 in guide rail II7, so that slider I8 can slide back and forth along guide rail II7.

[0036] In addition, connecting blocks 26 are respectively installed on the first front pressure block 1, the first rear pressure block 3, and the intermediate pressure block 5 between them. A spring 12 is provided between the connecting blocks 26, and the first connecting shaft 13 passes through the connecting blocks 26 and is fixed by the spring 12. Connecting blocks 26 are also respectively installed on the second front pressure block 2, the second rear pressure block 4, and the intermediate pressure block 5 between them. A spring 12 is provided between the connecting blocks 26, and the second connecting shaft 14 passes through the connecting blocks 26 and is fixed by the spring 12. The first connecting shaft 13 is parallel to guide rail I 6, and the second connecting shaft 14 is parallel to guide rail II 7.

[0037] The first driving component of this utility model includes a first closed-loop motor 15, a first threaded screw 16, a first gear 17, a bidirectional threaded screw 18, a second gear 19, a first fixing rod 20, and a second fixing rod 40. The first threaded screw 16 is connected to the first closed-loop motor 15. The first gear 17 is fixed on the first threaded screw 16. The first fixing rod 20 is connected to the first rear pressure block 3. The second fixing rod 40 is connected to the second rear pressure block 4. The two ends of the bidirectional threaded screw 18 are fixedly connected to the first fixing rod 20 and the second fixing rod 40, respectively. The second gear 19 is fixed on the bidirectional threaded screw 18. The first gear 17 and the second gear 19 mesh. The first closed-loop motor 15 drives the first gear 17 to rotate. The first gear 17 meshes with the second gear 18, which in turn drives the bidirectional spiral screw 18 to rotate. One end of the bidirectional spiral screw 18 has a clockwise thread and the other end has a counterclockwise thread. The first fixed rod 20 and the second fixed rod 40 have internal threads with opposite directions. Through the rotation of the bidirectional spiral screw 18, the first fixed rod 20 and the second fixed rod 40 achieve reverse synchronous movement under the meshing of their internal threads and the threads on the bidirectional spiral screw 18.

[0038] In addition, sliders II9 are respectively installed on the first front pressure block 1 and the second front pressure block 2, located below slider I8. Guide rail III25 passes through the two sliders II9 and is installed inside the two sliders II9. The two sliders II9 slide left and right along guide rail III25. The working mode of sliders II9 and guide rail III25 is the same as that of sliders II9 and guide rail II7, and will not be described again.

[0039] The second drive component includes a second closed-loop motor 21, a second threaded screw 22, a guide rod 23, and a connecting rod 24. One end of the connecting rod 24 is connected to the guide rail Ⅲ 25 between the first front pressure block 1 and the second front pressure block 2, and the other end is connected to the guide rod 23. The guide rod 23 is fixed parallel to the second threaded screw 22, and the second threaded screw 22 is connected to the second closed-loop motor 21.

[0040] The present invention also includes a fixed base 27, through which the guide rod 23 passes and the second threaded rod 18 passes through the lower half of the base. The second threaded rod 18 is arranged perpendicularly to the guide rod 23.

[0041] In actual use, the operator first selects the appropriate number of outer pressure block modules according to the shape and size of the pocket fabric, adjusts the distance between the outer pressure block modules, and selects the appropriate outer pressure block 7 for installation. The operator then adjusts the rotation angle of the outer pressure block 7 and simultaneously selects the appropriate shape and number of inner pressure blocks for installation. Finally, on the operation interface of the central control device, parameters such as the extension distance of the outer pressure block 7, the moving distance and speed of the base frame 1, the inner pressure block components, and the front-back, left-right, and right-back distances between each inner pressure block are set. After startup, the bag-opening device in the sewing machine transports the pocket fabric to the garment to be sewn on the worktable. The central control device of the sewing machine controls the spiral rod 3 on the motor 2 to rotate clockwise, pushing the support plate 5 along the slide rail, and the outer pressure block 7 reaches the set position. Simultaneously, the central control device of the sewing machine controls the first closed-loop motor 15 to rotate the first threaded screw 16 clockwise, which in turn drives the first gear 17 to rotate clockwise as well. The first gear 17 meshes with the second gear 19 and drives the second gear 19 to rotate counterclockwise, which in turn drives the first fixed rod 20 and the second fixed rod 40 to unfold outward along the bidirectional threaded screw 18. The first fixed rod 20 drives the first rear pressure block 3 connected to it to unfold outward, while the second fixed rod 40 drives the second rear pressure block 4 connected to it to unfold outward, which in turn drives the other pressure blocks connected to it to move in the same direction. Simultaneously, the second closed-loop motor 21 controls the second threaded screw 22 to rotate counterclockwise and extend forward, causing the guide rod 23 fixed to it to also extend forward. The guide rod 23 is connected to the connecting rod 24, and the connecting rod 24 is connected to the guide rail Ⅲ 25. The guide rod 23 pushes the guide rail Ⅲ 25 forward. The guide rail Ⅲ 25 is connected to the first front pressure block 1 and the second front pressure block 2, which in turn causes each pressure block to slide forward and unfold along the guide rails connected to it. The front-to-back distance between the pressure blocks connected to the guide rail Ⅰ 6 increases, and the front-to-back distance between the pressure blocks connected to the guide rail Ⅱ 7 also increases. After the distance between the pressure blocks of the pressure block component is automatically adjusted, the central control device drives the entire fabric pressing device to move to the set position directly above the pocket fabric to be sewn, and then it falls to begin sewing.

[0042] After sewing is completed, the central control device controls the entire pressing device to rise, the spiral rod 3 on the motor 2 rotates counterclockwise, and pulls the support plate 5 back along the slide rail 6, and the outer pressing block 7 returns to the set position. At the same time, the central control device of the sewing machine controls the first closed-loop motor 15 to control the first threaded screw 16 to rotate counterclockwise, which drives the first gear 17 to rotate counterclockwise as well. The first gear 17 meshes with the second gear 19 and drives the second gear 19 to rotate clockwise, which drives the first fixed rod 20 and the second fixed rod 40 to retract inward along the bidirectional threaded screw 18. The first fixed rod 20 drives the first rear pressing block 3 connected to it to retract inward, and the second fixed rod 40 drives the second rear pressing block 4 connected to it to retract inward, which in turn drives the other pressing blocks connected to it to move in the same direction. Simultaneously, the second closed-loop motor 21 controls the second threaded screw 22 to rotate clockwise backward and retract, causing the guide rod 23 fixed to it to also retract backward. The guide rod 23 is connected to the connecting rod 24, and the connecting rod 24 is connected to the guide rail Ⅲ 25. The guide rod 23 pulls the guide rail Ⅲ 25 backward, and the guide rail Ⅲ 25 is connected to the first front pressing block 1 and the second front pressing block 2, thereby causing each pressing block to slide backward and retract along the guide rails connected to them. The front-to-back distance between the pressing blocks connected to the guide rail Ⅰ 6 is reduced to the set value, and the front-to-back distance between the pressing blocks connected to the guide rail Ⅱ 7 is reduced to the set value. The central control device controls the entire pressing device to return to its original position for standby.

[0043] It should be noted that the central control device controls the movement of the entire pressing device and the base frame structure. The structure and control method of this part are not disclosed in this application. Since the above content is existing public technology and the applicant has also applied for patent protection for the above content, this application will not describe it.

Claims

1. A fabric pressing device for a bag-applying machine, characterized in that: It consists of an inner pressure fabric structure and an outer pressure fabric structure. The inner pressure fabric structure includes an inner pressure fabric driving component and an inner pressure block component. The inner pressure fabric driving component consists of a first driving component and a second driving component. The inner pressure block component consists of a first front pressure block, a second front pressure block, a first rear pressure block, and a second rear pressure block. The first rear pressure block and the second rear pressure block are connected by guide rails, and the second front pressure block and the second rear pressure block are also connected by guide rails. The two ends of the first driving component are respectively connected to the first rear pressure block and the second rear pressure block, driving the first rear pressure block and the second rear pressure block to move left and right in a horizontal position, thereby driving the first front pressure block, the second rear pressure block, and the third rear pressure block. The first and second front pressure blocks move in the same direction; the second drive is connected to the second rear pressure block, driving the second rear pressure block to extend and retract in a horizontal position, which in turn drives the first rear pressure block, the first front pressure block, and the second front pressure block to move in the same direction; the outer pressure cloth structure consists of a base frame and three or more outer pressure cloth modules fixed on the base frame. The outer pressure cloth module includes an outer pressure cloth drive component, a transmission component, an adjusting rod, and an outer pressure block. The bottom of the transmission component is fixed on the base frame, and the top is fixed with an adjusting rod. The other end of the adjusting rod is connected to the outer pressure block. The outer pressure cloth drive component is connected to the transmission component, driving the adjusting rod to move back and forth.

2. The pressing device for a bag-applying machine according to claim 1, characterized in that: The first driving component includes a first closed-loop motor, a first threaded screw, a first gear, a double-ended threaded screw, a second gear, a first fixed rod, and a second fixed rod. The first threaded screw is connected to the first closed-loop motor, and the first gear is fixed on the first threaded screw. The first fixed rod is connected to the first rear pressure block, and the second fixed rod is connected to the second rear pressure block. Both ends of the double-ended threaded screw are connected to the first fixed rod and the second fixed rod, respectively. The second gear is connected to the double-ended threaded screw, and the first gear and the second gear mesh. The second driving component includes a second closed-loop motor, a second threaded screw, a guide rod, and a connecting rod. One end of the connecting rod is connected to the guide rail between the first front pressure block and the second front pressure block, and the other end is connected to the guide rod. The guide rod is fixedly connected to the second threaded screw, and the second threaded screw is connected to the second closed-loop motor.

3. The pressing device for a bag-applying machine according to claim 2, characterized in that: The first closed-loop motor drives the first gear to rotate. The first gear meshes with the second gear, which in turn drives the bidirectional spiral screw to rotate. One end of the bidirectional spiral screw has a clockwise thread, and the other end has a counterclockwise thread. The first fixed rod and the second fixed rod have internal threads with opposite directions. Through the rotation of the bidirectional spiral screw, the first fixed rod and the second fixed rod achieve reverse synchronous movement under the meshing of their internal threads and the threads of the bidirectional spiral screw.

4. The pressing device for a bag-applying machine according to claim 1, characterized in that: Connecting blocks are also installed on the first front pressure block and the first rear pressure block, and springs are provided between the connecting blocks. The first connecting shaft passes through the connecting blocks and is fixed by the springs. Connecting blocks are also installed on the second front pressure block and the second rear pressure block, and springs are provided between the connecting blocks. The second connecting shaft passes through the connecting blocks and is fixed by the springs.

5. The pressing device for a bag-applying machine according to claim 2, characterized in that: It also includes a fixed base, with a guide rod passing through its upper half and a bidirectional threaded screw passing through its lower half, the bidirectional threaded screw being set perpendicular to the guide rod.

6. The pressing device for a bag-applying machine according to claim 1, characterized in that: The transmission component consists of a base, a support plate, and a slide rail. The external pressure cloth driving component consists of a motor and a screw rod. The base is fixed on the base frame, and a slide rail is installed on its top. The support plate is connected to the base through the slide rail. The motor is fixed on the base and connected to the screw rod. The screw rod is fixed to the support plate. The motor drives the screw rod to rotate, and the screw rod drives the support plate to slide back and forth along the slide rail on the base.

7. The pressing device for a bag-applying machine according to claim 1, characterized in that: One or more intermediate pressure blocks are provided between the first front pressure block and the first rear pressure block, and between the second front pressure block and the second rear pressure block.

8. The pressing device for a bag-applying machine according to claim 1, characterized in that: A slider is installed on each of the first front pressure block, the first rear pressure block, the second front pressure block, and the second rear pressure block. The top of the slider is provided with a groove, and dovetail grooves are provided on both sides of the guide rail along the length direction. A protruding structure is provided in the groove, and the protruding structure is installed in the dovetail groove, so that the slider can slide along the guide rail, thereby driving the first front pressure block, the first rear pressure block, the second front pressure block, and the second rear pressure block to move back and forth along the guide rail.

9. The pressing device for a bag-applying machine according to claim 1, characterized in that: The base frame has several mounting holes, and the mounting position of the external pressure cloth module on the base frame is adjustable; the number of adjusting rods in the external pressure cloth module can be one or more.

10. The pressing device for a bag-applying machine according to claim 1, characterized in that: The outer pressure block has several connection holes, and the two ends of the adjusting rod have groove holes. The screw passes through the groove holes to connect the adjusting rod to the outer pressure block and the transmission device respectively. The position of the screw in the groove hole can be adjusted.

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