Rope cutting device for stringing bag making machine

Abstract

The utility model relates to a rope cutting device for a stringing bag making machine, which comprises a workbench, the workbench is provided with a rope cutting station, a hot knife and a cutter are arranged at the rope cutting station, the hot knife and the cutter are parallel to each other and are staggered along the direction perpendicular to the axis of the hot knife, the cutter is linked with a lifting block, the lifting block is linked with a belt, two ends of the belt are respectively linked with belt wheels, and the belt wheels are connected with the hot knife. The belt wheels are rotatably installed on the workbench, one set of belt wheels are in linkage with a servo motor, and the servo motor is fixedly installed on the workbench. According to the rope cutting device for the stringing bag making machine, the servo motor and the belt are adopted to control the cutter, production efficiency is improved, it is guaranteed that the lengths of rope bodies are consistent, and cost is reduced.

Description

Technical Field

[0001] The utility model specifically relates to a rope cutting device for a rope threading bag making machine. Background Art

[0002] The Chinese invention patent application document with the publication number "CN117734232A" discloses a non-woven bag making machine with automatic rope threading, including a frame, a feeding device, a folding device, a punching device, an automatic rope threading device, a rope cutting device, a bag dividing device and other main parts. Among them, the rope cutting device is a key component in the non-woven bag making machine for cutting the rope body and ensuring that the rope body is stably threaded into the folded edge of the non-woven bag body. It consists of a hot knife, a cutter, a second cylinder, a first linkage plate, a second linkage plate, a press plate and a third cylinder (Figures 8-11 of the specification of the public document). The hot knife and the cutter are arranged opposite to each other. In addition to having cutting force, the hot knife can also perform hot welding during the cutting process to make the rope body bonded to the non-woven fabric. The second cylinder controls the extension and contraction of the cutter, and changes the reserved length of the rope body by adjusting the maximum extension of the cutter. The first linkage plate and the second linkage plate are used in conjunction to change the relative position of the cutter and the hot knife, so as to achieve the cutting of the rope body at different positions before and after the bag body. The pressing plate presses the non-woven bag under the action of the third cylinder to ensure the stability of the rope cutting process and the accurate reservation of the rope length.

[0003] The rope cutting device mainly uses a cylinder (second cylinder) as power to control the lifting and lowering of the cutter to achieve rope cutting, which has the following defects:

[0004] First, the response speed is slow and cannot adapt well to the high-speed production of the rope-threading non-woven bag making machine. There is a delay in the start and stop of the cylinder, which will cause the production speed to decrease, increase the production cycle, reduce the output, and affect the overall efficiency when the bag making machine needs to quickly and continuously complete the rope cutting of multiple bags. At the same time, when emergency stops or quick mold changes are required to adapt to non-woven bags of different specifications, the response speed of the cylinder is not fast enough, causing production interruptions or material waste.

[0005] Secondly, the positioning accuracy of the cylinder is poor, which can easily lead to inconsistency in the cutting position of the rope. In long-term production, this will cause the rope length to be different, affecting the appearance and function of the bag. The vibration caused by the cylinder action will also make the cut surface of the rope uneven, damaging the appearance and load-bearing capacity of the product. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a rope cutting device for a rope threading bag making machine in view of the deficiencies of the above-mentioned prior art, adopt a servo motor and a belt to control the cutter, improve production efficiency, ensure the consistency of rope length, and reduce costs.

[0007] To achieve the above object, the utility model provides the following technical solution: a rope cutting device for a rope threading bag making machine, including a workbench, the workbench is provided with a rope cutting station, at the rope cutting station there are a hot knife and a cutting knife, the hot knife and the cutting knife are parallel to each other and are arranged in a staggered manner along the direction perpendicular to the axis of the hot knife, and it is characterized in that: the cutting knife is linked with a lifting block, the lifting block is linked with a belt, both ends of the belt are respectively linked with belt pulleys, the belt pulleys are rotatably installed on the workbench, one group of belt pulleys is linked with a servo motor, and the servo motor is fixedly installed on the workbench.

[0008] With the above technical solution, the servo motor and the belt are used to replace the cylinder to control the lifting of the cutting knife, with high control precision, no delay in starting and stopping, capable of quickly adapting to the high-speed production requirements of the non-woven bag making machine, effectively improving production efficiency and output. At the same time, the servo motor can accurately control the up and down movement position of the cutting knife, ensuring the consistency of the rope cutting position, thereby ensuring the uniformity of the rope body length, improving the appearance quality and functional performance of the product, reducing material waste, and reducing production costs. Among them, the hot knife is different from the cutting knife. The cutting knife only has a cutting force, while the hot knife also has a hot welding function during the process of cooperating with the cutting knife to cut, aiming to bond the rope body with the non-woven fabric, so that during the process of the cutting knife and the hot knife cooperating to cut the rope body, the rope body will not move along with the cutting knife, thus completing the rope cutting work and the rope body is stably threaded into the folded edge of the non-woven bag body; further, the servo motor can accurately control the telescopic of the cutting knife. In actual use, by changing the maximum extension amount of the cutting knife, the reserved length of the rope body can be changed to meet the actual needs, and it has high adaptability, and can be widely applied to the processing of different specifications and different types of rope threading non-woven bag bodies; further, the positional relationship between the cutting knife and the hot knife can be changed according to the actual situation, taking the feeding direction of the non-woven bag material as a reference, (1) if the cutting knife is installed on the front side of the cutting knife, the processed rope body is located in front of the bag body, the hot knife and the cutting knife will not touch the rope, and the rope length will not be longer than the width of the bag; (2) if the cutting knife is installed on the rear side of the cutting knife, the processed rope body is located behind the bag body, and the rope is made into a long rope at the back of the bag body. In this way, air blowing can be added to the hot knife and the cutting knife to avoid the hot knife and the cutting knife from cutting the rope. Thus, the dual use of the rope cutting device is realized, and the processed rope body can be in front of the bag body or behind the bag body. Further, two groups of cutting knives are arranged on the knife holder. Only by changing the installation position of the cutting knife can the rope cutting work of the non-woven bag with "the rope is in front of the bag body" or "the rope is behind the bag body" be satisfied, and the operation is convenient.

[0009] The above-mentioned rope cutting device for a rope threading bag making machine can be further set as: the lifting block is linked with a first slider, the first slider is slidably connected with a first slide rail, the first slide rail is fixed on the workbench, and the first slide rail is parallel to the belt.

[0010] With the above technical solution, the parallel movement of the first slider along the first slide rail ensures the straightness and stability of the cutter's lifting, improves the accuracy of the rope cutting position, and guarantees the consistency of the rope body length. At the same time, the design of the first slide rail provides a stable movement guide for the cutter, reduces the cutter's vibration during high-speed production, and ensures the flatness of the rope body's cutting surface.

[0011] The above-mentioned rope cutting device for a rope threading and bag making machine can be further configured as follows: The workbench includes a work panel and a first mounting plate that are perpendicular to each other. The rope cutting stations are distributed in the middle of the work panel, and a work hole runs through the middle of the work panel. The hot knife and the cutter are distributed at the work hole and are arranged in a staggered manner along the direction perpendicular to the axis of the work hole. The first mounting plate is distributed on the side of the work panel, and the two are detachably connected by screws. The first slide rail is detachably mounted on the first mounting plate by screws. A set of pulleys is hinged on the first mounting plate. The side at the upper end of the first mounting plate is detachably connected to a second mounting plate by screws. The work panel, the first mounting plate, and the second mounting plate are perpendicular to each other. A third mounting plate is connected to the side of the second mounting plate away from the first mounting plate. The third mounting plate and the first mounting plate are parallel to each other. The body of the servo motor is detachably mounted on the third mounting plate by screws, and another set of pulleys is linked to the output end of the servo motor.

[0012] With the above technical solution, the work panel provides support for the rope cutting work, facilitating the work of the cutter and the hot knife. The first mounting plate, the second mounting plate, and the third mounting plate facilitate the installation of components such as belts, pulleys, and servo motors.

[0013] The above-mentioned rope cutting device for a rope threading and bag making machine can be further configured as follows: The work panel is provided with a lifting plate distributed around the work hole. The lifting plate is provided with an inclined plate that slopes upward on the side away from the cutter.

[0014] With the above technical solution, the main function of the lifting plate in the rope cutting device for a rope threading and bag making machine is to stabilize the non-woven fabric bag body and the rope body during the rope cutting process, ensuring the accuracy and stability of the rope cutting. The lifting plate located on the side away from the cutter, through the design of its inclined plate that slopes upward, helps to lift the bag body to an appropriate position before rope cutting, so that the bag body can be kept flat during rope cutting, avoiding rope cutting errors caused by inaccurate bag body position.

[0015] The above-mentioned rope cutting device for a rope threading and bag making machine can be further configured as follows: A pressure plate and a pressure cylinder linked to the pressure plate are also provided on one side of the work hole. The body of the pressure cylinder is detachably connected to a fourth mounting plate by screws, and the fourth mounting plate is fixed on the second mounting plate.

[0016] With the above technical solution, during the process of cutting the rope, the pressing plate presses against the non-woven bag body driven by the first cylinder, improving the working stability of the rope cutting device, making the reserved length of the rope more accurate and the cutting faster.

[0017] The above-mentioned rope cutting device for a rope-threading bag-making machine can be further arranged as follows: a lateral adjusting member is linked to the side of the working panel, the lateral adjusting member is in threaded linkage with a lead screw, a hand wheel is provided at the end of the lead screw and is linked to a lateral adjusting plate; a second slider is linked below the working panel, the second slider is slidably connected to a second slide rail, both ends of the second slide rail are fixedly connected to the lateral adjusting plate, the lateral adjusting plate is linked to a third slider, the third slider is linked to a third slide rail, and the third slide rail is fixed to the frame of the bag-making machine.

[0018] With the above technical solution, by rotating the hand wheel, the lead screw rotates accordingly, changing the position of the lateral adjusting member, that is, changing the lateral position of the working panel. During longitudinal adjustment, loosen the screw on the third slider, then push the working panel along the third slide rail until the desired position, and finally tighten the screw on the third slider to ensure that the third slider will not move along the third slide rail, that is, the longitudinal adjustment is completed.

[0019] The above-mentioned rope cutting device for a rope-threading bag-making machine can be further arranged as follows: the hot knife includes an upper hot block and a lower hot block arranged oppositely up and down, several groups of protruding hot points are provided at the end of the upper hot block or the lower hot block, several groups of screw holes are provided on the side of the upper hot block, the cutting knife is provided with a strip-shaped hole, and the cutting knife is fixedly connected to the upper hot block by screws passing through the strip-shaped hole and the screw holes. There is a material passing gap between the cutting knife and the lower hot block, and a U-shaped notch is provided at the lower end of the cutting knife.

[0020] With the above technical solution, by setting the hot knife as an upper hot block and a lower hot block arranged oppositely up and down, and then matching with the special structure of the cutting knife, a more accurate and efficient rope cutting and heat-sealing process is achieved compared with the prior art (only one group of cutting knives and one group of lower hot blocks). Specifically, several groups of protruding hot points provided at the end of the upper hot block or the lower hot block of the hot knife can provide more concentrated heat during the heat-sealing process, ensuring a firmer adhesion between the non-woven fabric and the rope body. The design of the screw holes on the side of the upper hot block and the strip-shaped hole provided on the cutting knife facilitate adjusting the installation position of the cutting knife according to the actual situation. The material passing gap between the cutting knife and the lower hot block ensures the smooth passage of the material, avoiding excessive contact between the overheated hot knife and the rope body, and the U-shaped notch design at the lower end of the cutting knife helps to achieve a cleaner cut when cutting the rope. Among them, the lower hot block is an ultrasonic generator.

[0021] The above-mentioned rope-cutting device for a rope-threading bag-making machine can be further configured as follows: A lower connecting block is linked to the upper end of the upper ironing block. An upper connecting block is provided above the lower connecting block. Guide rods are fixedly connected to both ends of the lower connecting block. Linear bearings are provided at both ends of the upper connecting block, and the linear bearings are sleeved on the upper half of the guide rods. A floating guide rod is connected to the middle of the upper connecting block. A plugging hole sleeving the outer periphery of the floating guide rod is provided in the middle of the lower connecting block. A spring is sleeved on the outer periphery of the floating guide rod, and the upper end of the spring abuts against the upper connecting block while the lower end abuts against the lower connecting block; the upper connecting block is fixedly connected to the lifting block.

[0022] With the above technical solution, when the upper ironing block moves down to work with the lower ironing block, the lower connecting block will squeeze the spring and drive the guide rods to float towards the upper connecting block, allowing the upper ironing block to float within a certain range to adapt to non-woven materials of different thicknesses or materials, ensuring a more fitting contact between the upper and lower ironing blocks and the material, thereby improving the ironing quality.

[0023] The above-mentioned rope-cutting device for a rope-threading bag-making machine can be further configured as follows: A punching plate is provided on the side of the workbench. A fabric passage through which the feed tape can pass is provided on the punching plate. A punching knife is provided above the fabric passage, and the punching knife is linked to a driving source that can control the up-and-down movement of the punching knife.

[0024] With the above technical solution, holes for the ropes to come out of the bag body can be processed. The driving source can adopt a cylinder, and controlling the up-and-down movement of the punching knife is sufficient.

[0025] The present utility model will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0026] Figure 1 Schematic diagram of the overall structure of the embodiment of the present utility model Figure 1 ;

[0027] Figure 2 Schematic diagram of the overall structure of the embodiment of the present utility model Figure 2 ;

[0028] Figure 3 Schematic diagram of a partial structure of the embodiment of the present utility model;

[0029] Figure 4 Magnified schematic diagram of the ironing knife and cutting knife of the embodiment of the present utility model;

[0030] Figure 5 Magnified schematic diagram of a part of the embodiment of the present utility model;

[0031] Figure 6 Schematic diagram of the cutting knife of the embodiment of the present utility model.

[0032] Label annotations: cutting knife 1, lifting block 2, belt 3, pulley 4, servo motor 5, first slider 6, first slide rail 7, working panel 8, first mounting plate 9, second mounting plate 10, third mounting plate 11, lifting plate 12, pressing plate 13, pressing cylinder 14, fourth mounting plate 15, lateral adjusting member 16, lead screw 17, lateral adjusting plate 18, second slider 19, second slide rail 20, third slider 21, third slide rail 22, upper ironing block 23, lower ironing block 24, ironing point 25, strip-shaped hole 26, material passing gap 27, U-shaped notch 28, lower connecting block 29, upper connecting block 30, guide rod 31, linear bearing 32, floating guide rod 33, spring 34, punching plate 35, fabric passage 36, punching knife 37. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0034] As Figures 1 to 6 shown, the rope cutting device for a stringing bag-making machine includes a workbench, the workbench is provided with a rope cutting station, a hot knife and a cutting knife 1 are arranged at the rope cutting station, the hot knife and the cutting knife 1 are parallel to each other and are arranged in a staggered manner along the direction perpendicular to the axis of the hot knife. The cutting knife 1 is linked with a lifting block 2, the lifting block 2 is linked with a belt 3, both ends of the belt 3 are respectively linked with a pulley 4, the pulley 4 is rotatably installed on the workbench, a group of belt 3 pulleys are linked with a servo motor 5, and the servo motor 5 is fixedly installed on the workbench. The servo motor 5 and the belt 3 are used to replace the cylinder to control the lifting of the cutting knife 1, with high control precision, no delay in starting and stopping, capable of quickly adapting to the high-speed production requirements of the non-woven bag-making machine, effectively improving production efficiency and output. At the same time, the servo motor 5 can accurately control the up and down movement position of the cutting knife 1, ensure the consistency of the rope cutting position, thereby ensuring the uniformity of the rope body length, improving the appearance quality and functional performance of the product, reducing material waste, and lowering production costs. Among them, the hot knife is different from the cutting knife 1. The cutting knife 1 only has a cutting force, while the hot knife also has a soldering function during the process of cooperating with the cutting knife 1 to cut, aiming to bond the rope body with the non-woven fabric, so that during the process of the cutting knife 1 and the hot knife cooperating to cut the rope body, the rope body will not move along with the cutting knife 1, thus completing the rope cutting work and the rope body is stably threaded into the folded edge of the non-woven bag body; further, the servo motor 5 can accurately control the telescopic of the cutting knife 1. In actual use, by changing the maximum extension amount of the cutting knife 1, the reserved length of the rope body can be changed to meet actual needs, and it has high adaptability and can be widely used in the processing of stringing non-woven bag bodies of different specifications and different types.

[0035] The lifting block 2 is linked with a first slider 6. The first slider 6 is slidably connected to a first slide rail 7. The first slide rail 7 is fixed to the workbench, and the first slide rail 7 is parallel to the belt 3. The parallel movement of the first slider 6 along the first slide rail 7 ensures the straightness and stability of the lifting of the cutting knife 1, improves the accuracy of the rope cutting position, and ensures the consistency of the rope body length. At the same time, the design of the first slide rail provides a stable movement guide for the cutting knife 1, reduces the vibration of the cutting knife 1 during high-speed production, and ensures the flatness of the cut surface of the rope body.

[0036] The workbench includes a work panel 8 and a first mounting plate 9 that are perpendicular to each other. The rope cutting stations are distributed in the middle of the work panel 8, and a work hole penetrates through the middle of the work panel 8. The ironing knife and the cutting knife 1 are distributed at the work hole and are arranged in a staggered manner along the direction perpendicular to the axis of the work hole; the first mounting plate 9 is distributed on the side of the work panel 8 and the two are detachably connected by screws. The first slide rail 7 is detachably mounted on the first mounting plate 9 by screws. A set of belt pulleys 4 are hinged to the first mounting plate 9. The side of the upper end of the first mounting plate 9 is detachably connected to a second mounting plate 10 by screws. The work panel 8, the first mounting plate 9, and the second mounting plate 10 are perpendicular to each other. A third mounting plate 11 is connected to the side of the second mounting plate 10 away from the first mounting plate 9. The third mounting plate 11 and the first mounting plate 9 are parallel to each other. The body of the servo motor 5 is detachably mounted on the third mounting plate 11 by screws. The other set of belt pulleys 4 is linked to the output end of the servo motor 5. The work panel 8 provides support for the rope cutting work and facilitates the work of the cutting knife 1 and the ironing knife. The first mounting plate 9, the second mounting plate 10, and the third mounting plate 11 facilitate the installation of components such as the belt 3, the belt pulleys 4, and the servo motor 5.

[0037] A lifting plate 12 is provided on the work panel 8 and is distributed around the work hole. The lifting plate 12 is provided with an inclined plate that slopes upward on the side away from the cutting knife 1. The main function of the lifting plate 12 in the rope cutting device for a non-woven bag making machine is to stabilize the non-woven bag body and the rope body during the rope cutting process, ensuring the accuracy and stability of the rope cutting. The lifting plate 12 on the side away from the cutting knife 1, through the design of its inclined plate that slopes upward, helps to lift the bag body to an appropriate position before rope cutting, so that the bag body can be kept flat during rope cutting and avoid rope cutting errors caused by inaccurate bag body position.

[0038] A pressing plate 13 and a pressing air cylinder 14 linked to the pressing plate 13 are also provided on one side of the work hole. The body of the pressing air cylinder 14 is detachably connected to a fourth mounting plate 15 by screws. The fourth mounting plate 15 is fixed to the second mounting plate 10. During the rope cutting process, the pressing plate 13 presses against the non-woven bag body under the drive of the first air cylinder, improving the working stability of the rope cutting device, making the reserved length of the rope body more accurate and the cutting faster.

[0039] There is a lateral adjustment part 16 on the side of the working panel 8. The lateral adjustment part 16 is threadedly linked with a lead screw 17. A handwheel is provided at the end of the lead screw 17 and is linked with a lateral adjustment plate 18. Below the working panel 8, there is a second slider 19. The second slider 19 is slidably connected to a second slide rail 20. Both ends of the second slide rail 20 are fixedly connected to the lateral adjustment plate 18. The lateral adjustment plate 18 is linked with a third slider 21. The third slider 21 is linked with a third slide rail 22. The third slide rail 22 is fixed to the frame of the bag-making machine. By rotating the handwheel, the lead screw 17 rotates accordingly, changing the position of the lateral adjustment part 16, that is, changing the lateral position of the working panel 8. During longitudinal adjustment, loosen the screw on the third slider 21, then push the working panel 8 along the third slide rail 22 until the desired position, and finally tighten the screw on the third slider 21 to ensure that the third slider 21 will not move along the third slide rail 22, that is, the longitudinal adjustment is completed.

[0040] The hot knife includes an upper hot block 23 and a lower hot block 24 which are arranged oppositely up and down. There are multiple groups of protruding hot points 25 at the end of the upper hot block 23 or the lower hot block 24. There are several groups of screw holes on the side of the upper hot block 23. The cutting knife 1 is provided with a strip-shaped hole 26. The cutting knife 1 is fixedly connected to the upper hot block 23 through screws passing through the strip-shaped hole 26 and the screw holes. There is a material passing gap 27 between the cutting knife 1 and the lower hot block 24. A U-shaped notch 28 is provided at the lower end of the cutting knife 1. By setting the hot knife as the upper hot block 23 and the lower hot block 24 which are oppositely up and down, and then matching with the special structure of the cutting knife 1, compared with the prior art (only one group of cutting knife 1 and one group of lower hot block), a more accurate and efficient rope cutting and heat-sealing process is achieved. Specifically, several groups of protruding hot points 25 provided at the end of the upper hot block 23 or the lower hot block 24 of the hot knife can provide more concentrated heat during the heat-sealing process, ensuring a firmer adhesion between the non-woven fabric and the rope body. The design of the screw holes on the side of the upper hot block 23 and the strip-shaped hole 26 provided on the cutting knife 1 facilitate adjusting the installation position of the cutting knife 1 according to the actual situation. The material passing gap 27 between the cutting knife 1 and the lower hot block 24 ensures the smooth passage of materials, avoiding excessive contact between the overheated hot knife and the rope body, and the U-shaped notch 28 design at the lower end of the cutting knife 1 helps to achieve a cleaner cut when cutting the rope. Among them, the lower hot block is an ultrasonic generator.

[0041] The upper end of the upper ironing block 23 is linked with a lower connecting block 29. An upper connecting block 30 is arranged on the upper part of the lower connecting block 29. Guide rods 31 are fixedly connected to both ends of the lower connecting block 29. Linear bearings 32 are arranged at both ends of the upper connecting block 30. The linear bearings 32 are sleeved on the upper half of the guide rods 31. A floating guide rod 33 is connected to the middle of the upper connecting block 30. A plugging hole sleeved on the outer periphery of the floating guide rod 33 is arranged in the middle of the lower connecting block 29. A spring 34 is sleeved on the outer periphery of the floating guide rod 33. The upper end of the spring 34 abuts against the upper connecting block 30, and the lower end abuts against the lower connecting block 29. The upper connecting block 30 is fixedly connected to the lifting block 2. When the upper ironing block moves down to work with the lower ironing block, the lower connecting block 29 will squeeze the spring 34 and drive the guide rod 31 to float towards the upper connecting block 30, allowing the upper ironing block to float within a certain range to adapt to non-woven materials of different thicknesses or materials, ensuring a better fit between the upper and lower ironing blocks and the material, thereby improving the ironing quality.

[0042] A punching plate 35 is arranged on the side of the workbench. A fabric passage 36 through which the material tape can pass is arranged on the punching plate 35. A punching knife 37 is arranged above the fabric passage 36. The punching knife 37 is linked with a driving source that can control the up and down movement of the punching knife 37. Holes for the rope to come out of the bag body can be processed. Among them, the driving source can adopt a cylinder (not shown in the figure), and the up and down movement of the punching knife 37 can be controlled.

[0043] The working principle is as follows: The non-woven fabric tape first passes through the fabric passage 36 of the punching plate 35, and the punching knife 37 punches out the holes for the rope to come out. The non-woven fabric tape is then pulled to the working panel 8. The pressing plate 13 presses down to hold one end of the non-woven fabric tape. The upper ironing block and the cutting knife 1 move down synchronously until the upper ironing block and the lower ironing block cooperate with each other to complete the ironing and welding. At the same time, since the cutting knife 1 cuts off the rope body, a certain length of the rope body is reserved at this time.

Claims

1. The rope cutting device for a rope threading bag making machine, comprising a workbench, wherein a rope cutting station is provided on the workbench, and a hot knife and a cutting knife are arranged at the rope cutting station. The hot knife and the cutting knife are parallel to each other and are arranged in a staggered manner along the direction perpendicular to the axis of the hot knife. It is characterized in that: The cutter linkage has a lifting block, the lifting block is linked with a belt, both ends of the belt are respectively linked with pulleys, the pulleys are rotatably installed on the workbench, one group of pulleys is linked with a servo motor, and the servo motor is fixedly installed on the workbench.

2. The rope cutting device for a string threading bag making machine according to claim 1, wherein: The lifting block is linked with a first slider, the first slider is slidably connected with a first slide rail, the first slide rail is fixed on the workbench, and the first slide rail is parallel to the belt.

3. The rope cutting device for a string threading bag making machine according to claim 2, wherein: The workbench includes a work panel and a first mounting plate that are perpendicular to each other. The rope cutting station is distributed in the middle of the work panel, and a work hole runs through the middle of the work panel. The hot knife and the cutter are distributed at the work hole and are arranged offset in a direction perpendicular to the axis of the work hole; the first mounting plate is distributed on the side of the work panel and the two are detachably connected by screws. The first slide rail is detachably installed on the first mounting plate by screws. One group of pulleys is hinged on the first mounting plate. The side of the upper end of the first mounting plate is detachably connected with a second mounting plate by screws. The work panel, the first mounting plate, and the second mounting plate are perpendicular to each other. The side of the second mounting plate away from the first mounting plate is connected with a third mounting plate. The third mounting plate and the first mounting plate are parallel to each other. The body of the servo motor is detachably installed on the third mounting plate by screws, and the other group of pulleys is linked with the output end of the servo motor.

4. The rope cutting device for a string threading bag making machine according to claim 3, characterized in that: The work panel is provided with a lifting plate distributed around the work hole, and the lifting plate is provided with an inclined plate inclined upward on the side away from the cutter.

5. The rope cutting device for a string threading bag making machine according to claim 3, wherein: One side of the work hole is also provided with a pressure plate and a pressure cylinder linked with the pressure plate. The body of the pressure cylinder is detachably connected with a fourth mounting plate, and the fourth mounting plate is fixed on the second mounting plate.

6. The rope cutting device for a string threading bag making machine according to claim 3, characterized in that: The side of the work panel is linked with a lateral adjusting member, the lateral adjusting member is threadedly linked with a lead screw, the end of the lead screw is provided with a hand wheel and is linked with a lateral adjusting plate; the lower part of the work panel is linked with a second slider, the second slider is slidably connected with a second slide rail, both ends of the second slide rail are respectively fixedly connected with the lateral adjusting plate, the lateral adjusting plate is linked with a third slider, the third slider is linked with a third slide rail, and the third slide rail is fixed on the frame of the bag making machine.

7. The rope cutting device for a string threading bag making machine according to any one of claims 1 to 6, characterized in that: The hot knife includes an upper hot block and a lower hot block arranged opposite to each other up and down. The end of the upper hot block or the lower hot block is provided with several groups of protruding hot points. The side of the upper hot block is provided with several groups of screw holes. The cutter is provided with a strip hole. The cutter is fixedly connected with the upper hot block by screws passing through the strip hole and the screw holes. There is a material passing gap between the cutter and the lower hot block, and the lower end of the cutter is provided with a U-shaped notch.

8. The rope cutting device for a string threading bag making machine according to claim 7, wherein: The upper end of the upper ironing block is linked with a lower connecting block. An upper connecting block is arranged on the upper part of the lower connecting block. Both ends of the lower connecting block are fixedly connected with guide rods. Linear bearings are arranged at both ends of the upper connecting block. The linear bearings are sleeved on the upper half of the guide rods. A floating guide rod is connected to the middle of the upper connecting block. A plugging hole sleeving the outer periphery of the floating guide rod is arranged in the middle of the lower connecting block. A spring is sleeved on the outer periphery of the floating guide rod. The upper end of the spring abuts against the upper connecting block, and the lower end abuts against the lower connecting block. The upper connecting block is fixedly connected with a lifting block.

9. The rope cutting device for a string threading bag making machine according to any one of claims 1 to 6, characterized in that: A punching plate is arranged on the side of the workbench. A fabric aisle through which a feed tape can pass is arranged on the punching plate. A punching knife is arranged above the fabric aisle. The punching knife is linked with a driving source that can control the punching knife to move up and down.

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