A control system and method for seam identification and tearing of open-width flexible fabrics

Abstract

The present invention provides a control system for identifying and tearing seam ends of open-width flexible fabrics, which is used in the technical field of automated fabric production. The control system comprises a seam end detection switch for to-be-torn, an overfeed seam end identifier, an overfeed belt encoder, a cloth-tearing belt encoder, a cloth-tearing seam end identifier and other components. The control system can realize accurate automatic identification and positioning control of seam ends to be torn, reduce the false detection rate and operation error rate of manual identification, thereby improving production efficiency, production quality and degree of automation, greatly reducing labor costs and improving the production working environment.

Description

Technical Field

[0001] The invention relates to the technical field of automated control of dyeing and finishing of open-width flexible fabrics, and in particular to a seam identification system for open-width flexible fabrics. Background Art

[0002] Open-width flexible fabrics are still labor-intensive in the entire dyeing and finishing industry. Since open-width flexible fabrics are made of several pieces of fabric sewn together in a material frame, and the length of each piece of fabric is not equal, there are multiple seams in each material frame, and the number is not fixed. Only the newly sewn seams between two material frames need to be torn off to ensure continuous online production in frames. In the continuous production process, the overfeeding process will cause the fabric to be lengthened or shortened as a whole, so it is extremely difficult to achieve automatic identification and positioning control of the seams to be torn. Production can only be maintained by manual identification and operation. This production process involves a lot of manual intervention, a poor production environment, high labor intensity, and poor stability, resulting in low production efficiency and quality, high labor costs, and no mature technology in the industry. Summary of the Invention

[0003] In view of this, the present invention discloses a control system and method for seam identification and tearing of open-width flexible fabrics, the specific scheme of which is as follows:

[0004] A control system for identifying and tearing seam ends of open-width flexible fabrics, comprising an overfeeding device, a material frame, a front overfeeding conveyor roller, a rear overfeeding conveyor roller, a seam end detection switch for tearing seam ends, a seam end identifier for tearing fabrics, a cloth tearing tape encoder, a cloth tearing device, a lower computer, and an overfeeding tape encoder;

[0005] The material frame is used to accommodate fabrics, including a front sewing material frame and a rear sewing material frame. The front sewing material frame is located in front of the rear sewing material frame. The leading end of the fabric stored in the front sewing material frame and the tail end of the fabric stored in the rear sewing material frame are sewn together to form a seam to be torn.

[0006] The seam head detection switch to be torn is arranged on the outer side wall of the front seam position frame;

[0007] The front overfeeding conveyor roller is arranged between the front seaming material frame and the overfeeding device, and the cloth in the front seaming material frame is conveyed to the overfeeding device via the front overfeeding conveyor roller, and the overfeeding belt encoder is arranged on the front overfeeding conveyor roller; the rear overfeeding conveyor roller is located between the overfeeding device and the cloth tearing device, and the cloth in the overfeeding device is conveyed to the cloth tearing device via the rear overfeeding conveyor roller;

[0008] The cloth-tearing device comprises a main body support, a tape guide roller, a rotary cloth-tearing chuck, and a cloth-tearing guide rail, wherein the tape guide roller is arranged on the main body support, the cloth-tearing tape encoder is arranged on the tape guide roller, and the cloth is transported to the position of the rotary cloth-tearing chuck via the tape guide roller; the cloth-tearing guide rail is arranged on the main body support, and the rotary cloth-tearing chuck is arranged on the cloth-tearing guide rail; the rotary cloth-tearing chuck comprises a fixed jaw, a movable jaw, and a chuck cylinder, wherein the fixed jaw is arranged on the cloth-tearing guide rail, the movable jaw is connected to the fixed jaw by the chuck cylinder, and the movable jaw is moved toward the fixed jaw by contraction of the chuck cylinder to clamp the seam end of the cloth;

[0009] The cloth tearing seam end identifier is arranged on the main body bracket of the cloth tearing device and is located on the rear side of the tape guide roller. The seam end detection switch to be torn, the cloth tearing seam end identifier, the cloth tearing tape encoder, and the overfeed tape encoder are all electrically connected to the lower computer.

[0010] As a supplement to the technical solution of the present invention, it also includes an overfeed seam head identifier, which is arranged in the overfeed device and is located within a range of no more than 10 cm in front of the differential roller of the overfeed device. The overfeed seam head identifier is electrically connected to the lower machine.

[0011] As a supplement to the technical solution of the present invention, the cloth-tearing device also includes a chuck bracket, a cloth-tearing driving motor, and a rack, the chuck bracket is arranged on the cloth-tearing guide rail and can slide on the cloth-tearing guide rail, the rack is arranged on the cloth-tearing guide rail, the cloth-tearing driving motor is arranged on the chuck bracket, and a gear meshing with the rack is provided on the rotating shaft of the cloth-tearing driving motor; the rotary cloth-tearing chuck is arranged on the chuck bracket, and the rotary cloth-tearing chuck also includes a chuck fixing part, a chuck moving part, and a chuck guide rod, the chuck fixing part is arranged on the chuck bracket, the chuck cylinder is fixed on the chuck fixing part, the chuck moving part is located on one side of the chuck fixing part, the piston rod end of the chuck cylinder is connected to the chuck moving part, the fixed jaw is arranged on the chuck fixing part, and the moving jaw is arranged on the chuck moving part;

[0012] One end of the chuck guide rod is arranged on the chuck fixing part, and the chuck moving part is provided with a guide sleeve for the chuck guide rod to pass through, and the other end of the chuck guide rod is located in the guide sleeve on the chuck moving part, and the chuck guide rod provides motion guidance for the movement of the chuck moving part.

[0013] As a supplement to the technical solution of the present invention, the cloth tearing device also includes a hollow rotating platform, a chuck rotation drive mechanism, a cloth tearing chuck flange, and a second sensor; the hollow rotating platform and the chuck rotation drive mechanism are both arranged on the chuck bracket, and the hollow rotating platform is connected to the chuck fixing part through the cloth tearing chuck flange; the chuck rotation drive mechanism includes a rotating motor, which is connected to the hollow rotating platform, drives the cloth tearing chuck flange to rotate, and drives the chuck fixing part to rotate, and the second sensor is arranged on the cloth tearing chuck flange.

[0014] As a supplement to the technical solution of the present invention, the side edge of the chuck fixing portion is an arc-shaped structure, and the side edge of the chuck movable portion is an arc-shaped structure. When the piston rod of the chuck cylinder retracts so that the fixed jaw and the movable jaw are in a state of clamping the cloth, the chuck fixing portion and the chuck movable portion are combined to make the outer periphery of the rotary cloth tearing chuck have a circular structure. When the chuck fixing portion and the chuck fixing portion are in a combined state, the following relationship is satisfied:

[0015] πD≥B

[0016] In the above formula, D is the diameter of the rotary tearing chuck, and B is the width of the fabric;

[0017] The rotation speed of the rotary cloth tearing chuck and the lateral speed of the rotary cloth tearing chuck satisfy the following relationship:

[0018] V 转 =V 横

[0019] In the above formula, V 转 V is the linear velocity of the outer periphery of the rotating cloth tearing chuck, 横 It is the traverse speed of the rotating cloth tearing chuck on the cloth tearing assembly track.

[0020] As a supplement to the technical solution of the present invention, the cloth tearing device also includes a tape walking and traction assembly, and the rotating cloth tearing chuck is located below the tape walking and traction assembly, so that the cloth is transported in a vertical state to the position of the rotating cloth tearing chuck; the tape walking and traction assembly includes a traction motor, a traction roller, a traction cylinder, a lifting support, and a pressure roller. The traction roller is arranged on the main body bracket and connected to the main body bracket through a bearing, so that the traction roller can rotate freely. The traction motor is connected to the traction roller, the traction cylinder is arranged on the main body bracket, the lifting support is arranged at the end of the piston rod of the traction cylinder, the pressure roller is arranged on the lifting support and is located above the traction roller, and the pressure roller is connected to the lifting support through a bearing.

[0021] As a supplement to the technical solution of the present invention, the cloth tearing device also includes a cutter assembly, a first chuck assembly, and a second chuck assembly; the first chuck assembly and the second chuck assembly are both arranged on the main body bracket, the first chuck assembly is arranged above the rotating cloth tearing chuck, and the second chuck assembly is arranged below the rotating cloth tearing chuck. The first chuck assembly and the second chuck assembly have the same structure and both include a first clamping jaw, a second clamping jaw, a bidirectional cylinder, and a cylinder bracket. The bidirectional cylinder is arranged on the main body bracket through the cylinder bracket, the first clamping jaw is arranged at the end of the first piston rod, and the second clamping jaw is arranged at the end of the second piston rod;

[0022] The cutter assembly includes a cutter bracket, a first cutter, a second cutter, and a first sensor. The cutter bracket is arranged on the main body bracket and is located between the first chuck assembly and the second chuck assembly. The first cutter and the second cutter are both arranged on the cutter bracket. The first cutter is located above the second cutter. The first sensor is provided on the first cutter and the second cutter.

[0023] The distance between the first cutter and the second cutter should satisfy the following formula:

[0024] L≥2H

[0025] In the above formula, L is the distance between the first cutter and the second cutter, and H is the maximum weft height of the fabric.

[0026] As a supplement to the technical solution of the present invention, the cloth tearing device also includes a cutter rail, a cutter rack, and a cutter assembly drive motor. The cutter rail and the cutter rack are both arranged on the main body bracket, the cutter bracket is arranged on the cutter rail, and the cutter assembly drive motor is arranged on the cutter bracket and connected to the cutter rack through a gear.

[0027] The present invention also discloses a method for using a control system for seam end recognition and tearing of open-width flexible fabric, comprising the following steps:

[0028] S1. The fabric in the front seam position frame is processed and enters the overfeed device. When the seam head to be torn is out of the monitoring position of the seam head detection switch, the seam head to be torn detection switch outputs an electrical signal to the lower computer;

[0029] S2. The overfeeding belt encoder starts measuring the fabric travel distance from the time the seam head to be torn detection switch loses its signal. When the fabric travel distance measured by the overfeeding belt encoder is S1, the seam head identified by the overfeeding seam head identifier is the seam head to be torn;

[0030] S1 should satisfy the following formula:

[0031] S 前 ×(1-α)≤S1≤S 前 ×(1+β)

[0032] In the above formula, S 前 is the actual distance between the seam head to be torn detection switch and the overfeed seam head identifier, α is the positive overfeed rate, and β is the negative overfeed rate;

[0033] S3. After the overfeed seam head identifier identifies the seam head to be torn, the identification signal is transmitted to the tear cloth tape encoder. When the tear cloth tape encoder starts measuring the cloth tape distance S2, when the tear cloth seam head identifier identifies the seam head to be torn;

[0034] S2 is represented as follows:

[0035] S后 =S2

[0036] In the above formula, S 后 The actual distance between the overfeed seam end identifier and the cloth tearing seam end identifier;

[0037] S4. After the cloth-tearing seam head identifier identifies the seam head to be torn, it transmits the identification signal to the cloth-tearing tape encoder, and the cloth-tearing tape encoder re-measures the cloth-tearing distance. When the cloth-tearing tape encoder starts to measure the cloth-tearing distance as S3, the seam head to be torn is transported to the cloth-tearing seam head positioning point.

[0038] S3 is represented as follows

[0039] S 定 =S3

[0040] In the above formula, S 定 is the actual distance between the cloth-tearing seam end identifier and the cloth-tearing seam end positioning point, wherein the cloth-tearing seam end positioning point is the midpoint between the first cutter and the second cutter;

[0041] The chuck moving part is driven by the first jaw to move the first and second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the second jaws to move the

[0042] S6. After the cloth tearing is completed, the chuck cylinder drives its piston rod to extend, so that the movable jaws move away from the fixed jaws, and the torn seam ends fall freely. The chuck rotation drive mechanism and the linear travel drive work together to reset the rotating cloth tearing chuck; at the same time, the first chuck assembly and the second chuck assembly release the grip of the cloth, and the cloth ends clamped by the second chuck assembly fall freely into the material frame provided below the second chuck assembly to store the cloth; the material frame provided below the second chuck assembly is replaced with a new empty material frame for storing the next frame of cloth.

[0043] Beneficial effect: The present invention can realize the identification and control of the seam heads to be torn between the material frames under the condition of overfeeding of the cloth, ensuring that when the cloth is transported to the cloth tearing seam head positioning point, the cloth tearing device can accurately clamp it and complete the cloth tearing action. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0045] Figure 2 It is a structural schematic diagram of the cloth tearing device of the present invention.

[0046] Figure 3 It is a structural schematic diagram of the cloth tearing device of the present invention.

[0047] Figure 4 It is a structural schematic diagram of the cloth tearing device of the present invention.

[0048] Figure 5 This is a schematic structural diagram of the rotary cloth-tearing chuck of the present invention.

[0049] Figure 6 This is a schematic structural diagram of the first chuck assembly of the present invention.

[0050] Figure 7 It is a schematic structural diagram of the tape walking and traction assembly of the present invention.

[0051] Figure 8 It is a structural schematic diagram of the seam head to be torn according to the present invention.

[0052] In the figure: 1. Front seam position frame, 2. Rear seam position frame, 3. Seam head to be torn, 4. Rack, 5. Front overfeed conveyor roller, 6. Rear overfeed conveyor roller, 7. Overfeed seam head identifier, 8. Cloth tearing seam head identifier, 9. Belt guide roller, 10. Cloth tearing device, 11. Clamp bracket, 12. Cylinder bracket, 13. Rotating cloth tearing clamp, 14. Cloth tearing guide rail, 15. Fixed jaw, 16. Moving jaw, 17. Clamp cylinder, 18. Clamp fixed part, 19. Clamp moving part, 20. Clamp guide rod, 21. Belt traction assembly, 22. Traction motor, 23. Traction 1. Guide roller, 24. Traction cylinder, 25. Lifting platform, 26. Pressure roller, 27. First chuck assembly, 28. Second chuck assembly, 29. Cutter bracket, 30. First cutter, 31. Second cutter, 32. Hollow rotating platform, 33. Chuck rotation drive mechanism, 34. Cloth tearing chuck flange, 35. Bidirectional cylinder, 36. Cutter rail, 37. Cutter rack, 38. Cutter assembly drive motor, 39. Cloth tearing drive motor, 40. First clamping jaw, 41. Second clamping jaw, 42. Detection switch for the seam to be torn, 43. Overfeed device, 44. Main bracket. DETAILED DESCRIPTION

[0053] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0054] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] In the fabric processing industry, to ensure continuous production and turnover of fabric in frames, multiple sections of fabric must be sewn together end to end before entering dyeing and finishing processes. This sewing location is known as the seam head. During fabric production, two frames of fabric must be sewn together to form a continuous fabric. The seam head where the two frames are sewn together is known as the seam head to be torn. Because the fabric stored in the material frame is made by sewing multiple pieces of fabric together continuously, multiple seam heads may exist within a single frame. After the process is completed, the seam heads at the seam head between the two frames must be removed to ensure continuous production and turnover of fabric in frames.

[0056] In summary, the seam head to be torn is formed only after the fabric heads between two adjacent material frames are sewn together. For example, the leading fabric head of the front-sewing material frame 1 is sewn together with the trailing fabric head of the rear-sewing material frame 2 to form the seam head to be torn 3. During the actual processing stage, the fabric in the front-sewing material frame 1 first enters the overfeed process section. After all the fabric in the front-sewing material frame 1 enters the overfeed process section, the fabric in the front-sewing material frame 1 is pulled by the seam head to be torn, and the trailing fabric head in the rear-sewing material frame 2 enters the overfeed process section.

[0057] The seam ends of the fabric within the material frame and the seam ends to be torn between the material frames are indistinguishable from the outside. To accurately identify and remove the seam ends to be torn at the location of the cloth-dropping and tearing device, the present invention uses a flat-width flexible fabric seam end recognition and control system to identify the seam ends to be torn and cooperates with the cloth-tearing device to tear the seam ends to be torn.

[0058] like Figures 1 to 8As shown, a control system for identifying and tearing seam ends of open-width flexible fabrics includes a material frame, a front overfeed conveyor roller 5, a rear overfeed conveyor roller 6, a seam end to be torn detection switch 42, an overfeed seam end identifier 7, an overfeed device 43, a cloth tearing seam end identifier 8, a cloth tearing tape encoder, a cloth tearing seam end positioning point, a cloth tearing device 10, and a lower computer.

[0059] The material frame is used to store cloth. The main body of the cloth is stacked back and forth in an S shape in the material frame. The first head of the cloth is located outside the material frame, so that the first head of the cloth is placed on the left frame of the material frame, and the end of the first head is located below the upper edge of the left frame of the material frame. The tail head of the cloth is also located outside the material frame, so that the tail head of the cloth is placed on the right frame of the material frame, and the end of the tail head naturally hangs down due to gravity, so that it is located below the upper edge of the right frame of the material frame.

[0060] The seam head to be torn detection switch 42 is set on the outer wall of the front seam position frame 1, and the seam head to be torn detection switch 42 is located on one side of the seam head to be torn 3, blocking the light source. The seam head to be torn detection switch 42 is a photoelectric sensor. When the seam head to be torn 3 is out of the monitoring range of the photoelectric sensor, the photoelectric sensor can receive the light signal and convert it into an electrical signal, and transmit the electrical signal to the lower computer.

[0061] The pre-overfeed conveyor roller 5 is arranged between the material frame and the overfeed device 43, and the cloth is conveyed into the overfeed device 43 through the pre-overfeed conveyor roller 5. When the cloth in the front sewing position material frame 1 is emptied, the seam head 3 to be torn will move upward under the pulling action of the pre-overfeed conveyor roller 5, so that the seam head to be torn detection switch 42 can receive the optical signal and convert the optical signal into an electrical signal to transmit to the lower computer.

[0062] The overfeed belt encoder is arranged on the overfeed front conveyor roller 5 and is used to measure the cloth belt travel distance.

[0063] The overfeed device 43 operates by adjusting the fabric length and thus the fabric weight to meet process requirements using two sets of differentially-speed rollers. The overfeed device 43 is used to positively and negatively overfeed the fabric before it enters the setting machine. Positive overfeeding, when the fabric feed speed exceeds the setting machine's speed, causes the fabric to retract, increase the weft density, and increase the weight. Negative overfeeding, when the fabric feed speed is lower than the setting machine's speed, causes the fabric to stretch, decrease the weft density, and reduce the weight.

[0064] The post-overfeed conveying roller 6 is located between the overfeeding device 43 and the cloth tearing device 10 , and can convey the overfed cloth into the cloth tearing device 10 .

[0065] The cloth-tearing device 10 includes a main frame 44, a tape guide roller 9, a rotary cloth-tearing chuck 13, and a cloth-tearing guide rail 14. The cloth-tearing guide rail 14 is disposed on the main frame 44, and the rotary cloth-tearing chuck 13 is disposed on the cloth-tearing guide rail 14 and can slide on the cloth-tearing guide rail 14 via a motor rack structure. The rotary cloth tearing chuck 13 includes a chuck fixing part 18, a chuck moving part 19, a chuck cylinder 17, a fixed jaw 15, and a moving jaw 16. The chuck fixing part 18 is arranged on the cloth tearing guide rail 14, and the chuck cylinder 17 is fixed on the chuck fixing part 18. The chuck moving part 19 is located on one side of the chuck fixing part 18, and the piston rod end of the chuck cylinder 17 is connected to the chuck moving part 19. The fixed jaw 15 is arranged on the chuck fixing part 18, and the moving jaw 16 is arranged on the chuck moving part 19. The moving jaw 16 is located directly below the fixed jaw 15. When the piston rod of the chuck cylinder 17 retracts, the chuck moving part 19 is driven to drive the moving jaw 16 to move toward the fixed jaw 15, so that the cloth located between the two jaws can be clamped.

[0066] The tape guide roller 9 is mounted on the main frame 44 and is located behind the rotating cloth tearing chuck 13. It serves as a driven rotating roller and is used to transport the overfed cloth to the rotating cloth tearing chuck 13. The cloth tearing tape encoder is mounted on the tape guide roller 9 and is used to measure the cloth travel distance.

[0067] The cloth tearing seam end identifier 8 is arranged on the main frame 44 of the cloth tearing device 10 and is located behind the cloth feeding guide roller 9. The cloth tearing seam end identifier 8 is a CCD camera that can identify the cloth seam end and the seam end to be torn 3.

[0068] As a preferred technical solution of the present invention, an overfeed seam end identifier 7 is further included. The overfeed seam end identifier 7 is disposed in the overfeed device 43 and is located within a range of no more than 10 cm in front of the differential roller of the overfeed device 43. The overfeed seam end identifier 7 is a CCD camera that captures light signals and converts them into digital signals. It can identify the seam end of the fabric and the seam end to be torn 3 and transmit the digital signals to the lower computer.

[0069] As a preferred technical solution of the present invention, the cloth tearing device 10 also includes a chuck bracket 11, a cloth tearing drive motor 39, a gear, and a rack 4. The chuck bracket 11 is arranged on the cloth tearing guide rail 14 and can slide on the cloth tearing guide rail 14. The rack 4 is arranged on the cloth tearing guide rail 14. The cloth tearing drive motor 39 is arranged on the chuck bracket 11 and the rotating shaft of the cloth tearing drive motor 39 is provided with a gear that engages with the rack 4. The chuck bracket 11 is driven by the cloth tearing drive motor 39 to slide on the cloth tearing guide rail 14. The rotary cloth tearing chuck 13 is arranged on the chuck bracket 11, and the rotary cloth tearing chuck 13 also includes a chuck guide rod 20, one end of the chuck guide rod 20 is arranged on the chuck fixing part 18, and the chuck moving part 19 is provided with a guide sleeve for the chuck guide rod 20 to pass through, and the other end of the chuck guide rod 20 is located in the guide sleeve on the chuck moving part 19. The chuck guide rod 20 is used to provide motion guidance for the movement of the chuck moving part 19, and at the same time serve as a support to bear the load provided by the chuck moving part 19 during the rotation process, thereby improving the stability of the overall structure.

[0070] As a preferred technical solution of the present invention, it also includes a hollow rotating platform 32, a chuck rotation drive mechanism 33, a cloth tearing chuck flange 34, and a second sensor. The hollow rotating platform 32 is connected to the chuck fixing portion 18 via the chuck rotation drive mechanism 33. The chuck rotation drive mechanism 33 includes a rotary motor connected to the hollow rotating platform 32, which drives the chuck flange 34 to rotate, thereby driving the chuck fixing portion 18 to rotate. The second sensor is located on the chuck flange 34 and can monitor the edge position of the cloth, ensuring that the rotating chuck can smoothly clamp the cloth.

[0071] By setting up the hollow rotating platform 32 and the chuck rotating drive mechanism 33, the rotatable function of the rotary cloth-tearing chuck 13 is realized. Under the condition that the width of the cloth seam head is certain, the rotating function of the rotary cloth-tearing chuck 13 is realized, and the cloth seam head can be wrapped around the rotary cloth-tearing chuck 13 during the rotary cloth-tearing process.

[0072] As a preferred technical solution of the present invention, the side edge of the chuck fixing part 18 is an arc-shaped structure, and the side edge of the chuck movable part 19 is an arc-shaped structure. When the piston rod of the chuck cylinder 17 retracts so that the fixed jaw 15 and the movable jaw 16 are in a cloth clamping state, the chuck fixing part 18 and the chuck movable part 19 are merged, so that the outer periphery of the rotary cloth tearing chuck 13 has a circular structure.

[0073] Under this structural design, the rotating cloth-tearing chuck 13 adopts a combination of rotation and transverse movement during the cloth-tearing process. When the fixed jaw 15 and the movable jaw 16 complete the cloth-clamping state, the rotating cloth-tearing chuck 13 rotates and moves transversely at the same time to tear off the seam ends of the cloth after the incision.

[0074] As a supplement to the above technical solution, when the clamp fixing portion 18 and the clamp moving portion 19 are in a combined state, the relationship between the diameter D of the rotary cloth tearing clamp 13 and the cloth width B satisfies:

[0075] πD≥B

[0076] After the cloth tearing is completed, the cloth wrapped around the rotating cloth tearing chuck 13 is less than one circle, so that the jaws can be opened smoothly. When the movable jaws 16 are released, the cloth can fall off freely from the rotating cloth tearing chuck 13.

[0077] like Figure 5 As shown, in this process, the rotation speed V of the rotating cloth tearing clamp 13 is set 转 The traverse speed V of the rotating cloth tearing chuck 13 is 横 The same is true, so that the lateral movement distance of the rotary cloth-tearing chuck 13 is the same as the cloth width B. The cloth width is the width of the cloth. During the cloth-tearing process, the cloth is wrapped around the outer surface of the rotary cloth-tearing chuck 13. Through the above-mentioned arrangement, the cloth-tearing is completed at a constant angle α during the cloth-tearing process, ensuring the stability of the cloth-tearing while reducing the lateral movement distance of the rotary cloth-tearing chuck 13, saving equipment production costs while improving space utilization. Compared with the rotary cloth-tearing chuck 13 that only moves horizontally to tear the cloth, its lateral movement distance is 2B, that is, the length of the guide rail on the straight-line travel bracket needs to be greater than 2B, and the cloth-tearing angle continues to decrease during the lateral movement, which seriously affects the stability of the cloth-tearing.

[0078] The cloth tearing seam end identifier 8 is arranged on the main frame 44 of the cloth tearing device 10. The cloth tearing seam end identifier 8 is a CCD camera that can identify the cloth seam end and the seam end to be torn 3. The cloth tearing seam end identifier 8 is located between the rotating cloth tearing clamp 13 and the overfeeding device 43.

[0079] The tape guide roller 9 is arranged on the main body bracket 44 and serves as a driven rotating roller for conveying the overfed cloth to the position of the rotating cloth tearing clamp 13.

[0080] As a preferred technical solution of the present invention, the cloth tearing device 10 also includes a belt-feeding traction assembly 21. The rotary cloth-tearing chuck 13 is located below the belt-feeding traction assembly 21, so that the cloth is fed vertically to the position of the rotary cloth-tearing chuck 13. The belt-feeding traction assembly 21 includes a traction motor 22, a traction roller 23, a traction cylinder 24, a lifting platform 25, and a pressure roller 26. The traction roller 23 is mounted on a main frame 44 and connected to the main frame 44 via a bearing, allowing the traction roller 23 to rotate freely. The traction motor 22 is connected to the traction roller 23 to drive the traction roller 23 to rotate.

[0081] The traction cylinder 24 is mounted on the main frame 44, and the lifting platform 25 is mounted on the end of the piston rod of the traction cylinder 24. The pressure roller 26 is mounted on the lifting platform 25 and is located above the traction roller 23. The pressure roller 26 is connected to the lifting platform 25 via a bearing, allowing the pressure roller 26 to rotate freely. The distance between the pressure roller 26 and the traction roller 23 is adjusted by the traction cylinder 24 to ensure that sufficient friction is applied to the fabric, thereby ensuring its traction.

[0082] The cloth-tearing device 10 further includes a cutter assembly, a first chuck assembly 27 , and a second chuck assembly 28 . The first chuck assembly 27 is disposed above the rotary cloth-tearing chuck 13 , and the second chuck assembly 28 is disposed below the rotary cloth-tearing chuck 13 .

[0083] The first chuck assembly 27 and the second chuck assembly 28 are both mounted on the main frame 44. The first chuck assembly 27 is used to clamp the upper portion of the fabric, while the second chuck assembly 28 is used to clamp the lower portion of the fabric. The length of the fabric between the first chuck assembly 27 and the second chuck assembly 28 is perpendicular to the horizontal plane. The first chuck assembly 27 and the second chuck assembly 28 have the same structure, each comprising a first clamping jaw 40, a second clamping jaw 41, a bidirectional cylinder 35, and a cylinder support 12. The bidirectional cylinder 35 is mounted on the main frame via the cylinder support 12. The bidirectional cylinder 35 is a dual-piston rod cylinder comprising two piston rods that can move in opposite directions. The first clamping jaw 40 is mounted at the end of the first piston rod, and the second clamping jaw 41 is mounted at the end of the second piston rod. The bidirectional cylinder 35 enables the first clamping jaw 40 and the second clamping jaw 41 to clamp the fabric.

[0084] The cutter assembly includes a cutter bracket 29, a first cutter 30, a second cutter 31, and a first sensor. The cutter bracket 29 is mounted on the main body bracket 44 and located between the first chuck assembly 27 and the second chuck assembly 28. The first cutter 30 and the second cutter 31 are both mounted on the cutter bracket 29, with the first cutter 30 positioned above the second cutter 31. The rotary cloth-tearing chuck 13 is positioned between the first and second cutters 30, 31. The first cutter 30 is used to cut the upper edge of the fabric, and the second cutter 31 is used to cut the lower edge of the fabric, forming an incision of 50 to 100 mm in length. Both the first cutter 30 and the second cutter 31 are equipped with a first sensor for monitoring the position of the fabric edge to ensure effective cutting. The first sensor is a photoelectric sensor.

[0085] like Figure 8As shown, during the cloth tearing process, the cloth break will extend along the length direction of the weft. In order to avoid the technical problem of the break extending to the cloth seam end and the clamping range of the first clamping head assembly and the second clamping head assembly, which affects the cloth tearing effect, it is ensured that the sewn edge of the cloth is exactly at the midpoint between the first cutter 30 and the second cutter 31, and satisfies the following formula:

[0086] L≥2H

[0087] In the above formula, L is the distance between the first cutter 30 and the second cutter 31, and H is the maximum weft height of the cloth.

[0088] Through the above design, even if the fabric has weft skew, the fabric break will not extend to the fabric seam head and the clamping range of the first clamping head assembly and the second clamping head assembly during the fabric tearing process.

[0089] As a supplement to the above technical solution, the cutter assembly also includes a cutter rail 36, a cutter rack 37, and a cutter assembly drive motor 38. The cutter rail 36 and the cutter rack 37 are both arranged on the main body bracket. The cutter bracket 29 is arranged on the cutter rail 36 and can slide on the cutter rail 36. The cutter assembly drive motor 38 is arranged on the cutter bracket 29 and is connected to the cutter rack 37 through a gear. The cutter assembly drive motor 38 can drive the cutter bracket 29 to slide on the cutter rail 36 to adjust the length of the fabric incision made by the first cutter 30 and the second cutter 31.

[0090] The present invention also discloses a method for using the above-mentioned open-width flexible fabric seam end identification and control system, which aims to realize the automatic identification of the seam end to be torn 3 and the automatic cloth tearing process. The method comprises the following steps:

[0091] S1. The fabric in the front-stitching material frame 1 is put on line for processing. When the fabric in the front-stitching material frame 1 is emptied, the to-be-torn seam head 3 is put on line and drives the fabric in the rear-stitching material frame 2 to be put on line for continuous production. The front-stitching material frame 1 is removed, and the rear-stitching material frame 2 is moved to the position of the front-stitching material frame 1 to maintain continuous production. Since the to-be-torn seam head 3 is put on line, it is separated from the monitoring position of the to-be-torn seam head detection switch 42. The to-be-torn seam head detection switch 42 outputs a to-be-torn seam head 3 loss signal to the lower computer, and the lower computer causes the overfeeding belt encoder to start measuring the belt distance of the fabric on the overfeeding front conveyor roller 5.

[0092] Since there are a number of fabric seam ends in the material frame during the production process, and the fabric seam ends have no difference in appearance from the seam ends to be torn 3 , the overfeed seam end identifier 7 cannot distinguish the seam ends to be torn 3 from the fabric seam ends.

[0093] S2. The overfeed belt encoder starts measuring the fabric travel distance S1 from the time the seam head detection switch 42 loses its signal. When the seam head detection switch 42 loses its signal for the seam head 3 to be torn, the seam head identified by the overfeed belt encoder as the seam head 3 to be torn is measured by the overfeed belt encoder.

[0094] S1 should satisfy the following formula:

[0095] S 前 ×(1-α)≤S1≤S 前 ×(1+β)

[0096] In the above formula, S 前 It is the actual distance between the seam head to be torn detection switch 42 and the overfeed seam head identification, specifically, the actual distance from the seam head to be torn 3 located between the two material frames to the overfeed seam head identifier 7 assuming that the length of the fabric has not changed; α is the positive overfeed rate, and β is the negative overfeed rate.

[0097] S3. After the overfeed seam head identifier 7 identifies the seam head 3 to be torn, it transmits the identification signal to the cloth tearing tape encoder. When the cloth tearing tape encoder starts to measure the cloth tape distance S2, the seam head identified by the cloth tearing seam head identifier 8 is the seam head 3 to be torn.

[0098] S2 is represented as follows

[0099] S 后 =S2

[0100] In the above formula, S 后 It is the actual distance between the overfeed seam end identifier 7 and the cloth-tearing seam end identifier 8. Specifically, after the seam end 3 to be torn passes through the overfeed device 43 and the overfeed seam end identifier 7, the length of the cloth will not change. The actual distance is the distance the seam end to be torn 3 travels from the overfeed seam end identifier 7 to the cloth-tearing seam end identifier 8.

[0101] S4. After the cloth-tearing seam head identifier 8 identifies the seam head 3 to be torn, it transmits the identification signal to the cloth-tearing tape encoder, and the cloth-tearing tape encoder re-measures the cloth tape travel distance. At the same time, the traction motor 22 of the tape traction assembly 21 slows down. When the cloth-tearing tape encoder starts to measure the cloth tape travel distance as S3, the seam head 3 to be torn can be accurately stopped at the cloth-tearing seam head positioning point, and then the cloth-tearing device 10 is driven to tear off the seam head 3 to be torn.

[0102] S3 is represented as follows

[0103] S 定 =S3

[0104] In the above formula, S 定The actual distance between the cloth tearing seam end identifier 8 and the cloth tearing seam end positioning point. The actual distance is specifically the distance the seam end 3 to be torn travels from the cloth tearing seam end identifier 8 to the cloth tearing seam end positioning point, which is the midpoint between the first cutter 30 and the second cutter 31.

[0105] S5. Turn off the traction motor 22 of the tape traction assembly 21, drive the first clamp assembly 27 to clamp the upper part of the seam head 3 to be torn, and the second clamp assembly 28 to clamp the lower part of the seam head 3 to be torn, start the cloth tearing drive motor 39 of the cloth tearing device 10, and move the clamp fixing part 18 and the clamp moving part 19 of the rotating cloth tearing clamp 13 toward the seam head 3 to be torn, until the edge of the cloth is located between the fixed jaw 15 and the movable jaw 16, and the clamp cylinder 17 works to clamp the fixed jaw 15 and the movable jaw 16 to clamp the cloth, and then the first cutter 30 of the cutter assembly is turned to the cloth. The edge of the cloth between the first chuck assembly 27 and the rotary cloth-tearing chuck 13 is cut, and the second cutter 31 cuts the edge of the cloth between the second chuck assembly 28 and the rotary cloth-tearing chuck 13, so that two cuts are formed on one edge of the cloth; then the cloth-tearing drive motor 39 of the cloth-tearing device 10 drives the rotary cloth-tearing chuck 13 to move along the cloth-tearing guide rail 14, and at the same time, the chuck rotation drive mechanism 33 drives the rotary cloth-tearing chuck 13 to rotate to tear off the seam to be torn, and the rotation speed of the rotary cloth-tearing chuck 13 and the lateral movement speed of the rotary cloth-tearing chuck 13 satisfy the following relationship:

[0106] V 转 =V 横

[0107] In the above formula, V 转 is the linear velocity of the outer periphery of the rotating cloth tearing chuck 13, V 横 is the traverse speed of the rotating cloth tearing chuck 13 on the cloth tearing assembly track;

[0108] S6. After the cloth tearing is completed, the chuck cylinder 17 drives its piston rod to extend, so that the movable jaw 16 moves away from the fixed jaw 15, and the torn seam head falls freely. The chuck rotation drive mechanism 33 and the linear travel drive work together to reset the rotary cloth-tearing chuck 13; at the same time, the first chuck assembly 27 and the second chuck assembly 28 release their grip on the cloth, and the cloth head clamped by the second chuck assembly 28 falls freely into the material frame provided below the second chuck assembly 28 to store the cloth; the material frame provided below the second chuck assembly 28 is replaced with a new empty material frame for storing the next frame of cloth.

[0109] The above is a complete cloth tearing process of the cloth tearing device 10 , and then the traction motor 22 of the tape traction assembly 21 is turned on to repeat the above process.

[0110] In the above technical solution, the overfeed seam end identifier 7 may not be used to monitor the seam end. In this state, the seam end of the cloth is only identified by the cloth tearing seam end identifier 8, so that the seam end to be torn at the cloth tearing position is moved to the cloth tearing seam end positioning point through system control. The specific solution is as follows:

[0111] S1. When the seam head 3 to be torn is out of the monitoring position of the seam head detection switch 42, the seam head detection switch 42 to be torn outputs a signal to the lower computer that the seam head 3 is lost, and the lower computer causes the cloth tearing tape encoder to start measuring the cloth tape distance.

[0112] S2. The cloth tearing tape encoder starts measuring the cloth tape travel distance S4 from the time when the seam detection switch 42 to be torn loses its signal.

[0113] S4 should satisfy the following formula:

[0114] S 总 ×(1-α)≤S4≤S 总 ×(1+β)

[0115] In the above formula, S 总 is the actual distance between the seam head to be torn detection switch 42 and the cloth-tear seam head identifier 8, specifically, the actual distance from the seam head to be torn 3 located between the two material frames to the cloth-tear seam head identifier 8, assuming that the length of the cloth has not changed; α is the positive overfeed rate, and β is the negative overfeed rate.

[0116] S3. After the cloth-tearing seam head identifier 8 identifies the seam head 3 to be torn, it transmits the identification signal to the cloth-tearing tape encoder, and the cloth-tearing tape encoder re-measures the cloth tape travel distance. At the same time, the traction motor 22 of the tape traction assembly 21 slows down. When the cloth-tearing tape encoder starts to measure the cloth tape travel distance as S3, the seam head 3 to be torn is moved to the cloth-tearing seam head positioning point, and then the cloth-tearing device 10 is driven to tear off the seam head 3 to be torn.

[0117] S3 is represented as follows

[0118] S 定 =S3

[0119] In the above formula, S 定 The actual distance between the cloth tearing seam end identifier 8 and the cloth tearing seam end positioning point. The actual distance is specifically the distance the seam end 3 to be torn travels from the cloth tearing seam end identifier 8 to the cloth tearing seam end positioning point, which is the midpoint between the first cutter 30 and the second cutter 31.

[0120] The disadvantage of the above technical solution is that, due to S 总 is the actual distance between the seam end detection switch 42 and the cloth tearing seam end identifier 8, so that S 总 Much larger than S 前, which makes the interval of S4 value much larger than the interval of S1 value, resulting in a larger recognition range and easy occurrence of S 总 The presence of multiple seams within the interval makes it difficult to accurately identify the seam 3 to be torn, thereby restricting the length range of each piece of cloth in the material frame.

[0121] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A control system for identifying and tearing seam ends of open-width flexible fabrics, comprising an overfeed device (43), characterized in that: It also includes a material frame, a front overfeeding conveyor roller (5), a rear overfeeding conveyor roller (6), a seam head detection switch to be torn (42), a seam head identifier for tearing cloth (8), a cloth tearing tape encoder, a cloth tearing device (10), a lower computer, and an overfeeding tape encoder; The material frame is used to accommodate fabrics, and comprises a front sewing material frame (1) and a rear sewing material frame (2). The front sewing material frame (1) is located in front of the rear sewing material frame (2). The leading end of the fabric stored in the front sewing material frame (1) and the trailing end of the fabric stored in the rear sewing material frame (2) are sewn together to form a seam to be torn (3). The seam head detection switch (42) to be torn is arranged on the outer side wall of the front seam position frame (1); The front overfeeding conveyor roller (5) is arranged between the front seaming position material frame (1) and the overfeeding device (43), and the cloth in the front seaming position material frame (1) is conveyed to the overfeeding device (43) via the front overfeeding conveyor roller (5), and the overfeeding tape encoder is arranged on the front overfeeding conveyor roller (5); the rear overfeeding conveyor roller (6) is located between the overfeeding device (43) and the cloth tearing device (10), and the cloth in the overfeeding device (43) is conveyed to the cloth tearing device (10) via the rear overfeeding conveyor roller (6); The cloth-tearing device (10) comprises a main frame (44), a tape guide roller (9), a rotary cloth-tearing chuck (13), and a cloth-tearing guide rail (14). The tape guide roller (9) is arranged on the main frame (44). The cloth-tearing tape encoder is arranged on the tape guide roller (9). The cloth is fed to the position of the rotary cloth-tearing chuck (13) through the tape guide roller (9). The cloth-tearing guide rail (14) is arranged on the main frame (44). The rotary cloth-tearing chuck ( 13) is arranged on the cloth-tearing guide rail (14); the rotary cloth-tearing chuck (13) comprises a fixed jaw (15), a movable jaw (16), and a chuck cylinder (17); the fixed jaw (15) is arranged on the cloth-tearing guide rail (14); the movable jaw (16) is connected to the fixed jaw (15) through the chuck cylinder (17); the movable jaw (16) is moved toward the fixed jaw (15) by contraction of the chuck cylinder (17) to clamp the seam end of the cloth; The cloth tearing seam end identifier (8) is arranged on the main body bracket (44) of the cloth tearing device (10) and is located at the rear side of the tape guide roller (9); the seam end detection switch (42) to be torn, the cloth tearing seam end identifier (8), the cloth tearing tape encoder, and the overfeeding tape encoder are all electrically connected to the lower computer.

2. The open-width flexible fabric seam identification and tearing control system according to claim 1, characterized in that: The invention also includes an overfeed seam head identifier (7), which is arranged in the overfeed device (43) and is located within a range of no more than 10 cm in front of the differential roller of the overfeed device (43). The overfeed seam head identifier (7) is electrically connected to the lower machine.

3. The control system for seam identification and tearing of open-width flexible fabrics according to claim 2, characterized in that: The cloth-tearing device (10) further comprises a chuck bracket (11), a cloth-tearing drive motor (39), and a rack (4); the chuck bracket (11) is arranged on the cloth-tearing guide rail (14) and can slide on the cloth-tearing guide rail (14); the rack (4) is arranged on the cloth-tearing guide rail (14); the cloth-tearing drive motor (39) is arranged on the chuck bracket (11); and a gear meshing with the rack (4) is provided on the rotating shaft of the cloth-tearing drive motor (39); a rotating cloth-tearing chuck (13) is arranged on the chuck bracket (11); and the rotating cloth-tearing chuck (13) is provided on the chuck bracket (11). ) also includes a chuck fixing part (18), a chuck moving part (19), and a chuck guide rod (20), wherein the chuck fixing part (18) is arranged on the chuck bracket (11), the chuck cylinder (17) is fixed on the chuck fixing part (18), the chuck moving part (19) is located on one side of the chuck fixing part (18), the piston rod end of the chuck cylinder (17) is connected to the chuck moving part (19), the fixed jaw (15) is arranged on the chuck fixing part (18), and the moving jaw (16) is arranged on the chuck moving part (19); One end of the chuck guide rod (20) is arranged on the chuck fixing part (18), and a guide sleeve for the chuck guide rod (20) to pass through is provided on the chuck moving part (19). The other end of the chuck guide rod (20) is located in the guide sleeve on the chuck moving part (19). The chuck guide rod (20) provides motion guidance for the movement of the chuck moving part (19).

4. The control system for seam identification and tearing of open-width flexible fabrics according to claim 3, characterized in that: The cloth-tearing device (10) further comprises a hollow rotating platform (32), a chuck rotating drive mechanism (33), a cloth-tearing chuck flange (34), and a second sensor; the hollow rotating platform (32) and the chuck rotating drive mechanism (33) are both arranged on the chuck bracket (11), and the hollow rotating platform (32) is connected to the chuck fixing part (18) via the cloth-tearing chuck flange (34); the chuck rotating drive mechanism (33) comprises a rotating motor, which is connected to the hollow rotating platform (32) and drives the cloth-tearing chuck flange (34) to rotate, thereby driving the chuck fixing part (18) to rotate, and the second sensor is arranged on the cloth-tearing chuck flange (34).

5. The open-width flexible fabric seam end recognition and tearing control system according to claim 4, characterized in that: The side edge of the chuck fixing portion (18) is an arc-shaped structure, and the side edge of the chuck moving portion (19) is an arc-shaped structure. When the piston rod of the chuck cylinder (17) retracts so that the fixed jaw (15) and the movable jaw (16) are in a state of clamping the cloth, the chuck fixing portion (18) and the chuck moving portion (19) are combined so that the outer periphery of the rotary cloth tearing chuck (13) is a circular structure. When the chuck fixing portion (18) and the chuck fixing portion (19) are in a combined state, the following relationship is satisfied: πD≥B In the above formula, D is the diameter of the rotary cloth tearing clamp (13), and B is the cloth width; The rotation speed of the rotary cloth-tearing chuck (13) and the lateral movement speed of the rotary cloth-tearing chuck (13) satisfy the following relationship: V 转 =V 横 In the above formula, V 转 is the linear velocity of the outer periphery of the rotating cloth tearing chuck (13), V 横 It is the traverse speed of the rotating cloth-tearing chuck (13) on the cloth-tearing assembly track.

6. The control system for seam identification and tearing of open-width flexible fabrics according to claim 5, characterized in that: The cloth tearing device (10) further comprises a belt-walking traction assembly (21), wherein the rotating cloth-tearing chuck (13) is located below the belt-walking traction assembly (21), so that the cloth is walked in a vertical state to the position of the rotating cloth-tearing chuck (13); the belt-walking traction assembly (21) comprises a traction motor (22), a traction roller (23), a traction cylinder (24), a lifting platform (25), and a pressure roller (26), wherein the traction roller (23) is arranged on the main frame (44) and is connected to the main frame (44) by a shaft. The bearing is connected to the main frame (44) so ​​that the traction roller (23) can rotate freely. The traction motor (22) is connected to the traction roller (23). The traction cylinder (24) is arranged on the main frame (44). The lifting platform (25) is arranged at the end of the piston rod of the traction cylinder (24). The pressure roller (26) is arranged on the lifting platform (25) and is located above the traction roller (23). The pressure roller (26) is connected to the lifting platform (25) through a bearing.

7. The control system for seam identification and tearing of open-width flexible fabrics according to claim 6, characterized in that: The cloth-tearing device (10) further comprises a cutter assembly, a first chuck assembly (27), and a second chuck assembly (28); the first chuck assembly (27) and the second chuck assembly (28) are both arranged on a main body bracket (44); the first chuck assembly (27) is arranged above the rotary cloth-tearing chuck (13); and the second chuck assembly (28) is arranged below the rotary cloth-tearing chuck (13); the first chuck assembly (27) and the second chuck assembly (28) have the same structure, and both comprise a first clamping jaw (40), a second clamping jaw (41), a bidirectional cylinder (35), and a cylinder bracket (12); the bidirectional cylinder (35) is arranged on the main body bracket through the cylinder bracket (12); the first clamping jaw (40) is arranged at the end of the first piston rod, and the second clamping jaw (41) is arranged at the end of the second piston rod; The cutter assembly comprises a cutter support (29), a first cutter (30), a second cutter (31), and a first sensor. The cutter support (29) is arranged on the main body support (44) and is located between the first chuck assembly (27) and the second chuck assembly (28). The first cutter (30) and the second cutter (31) are both arranged on the cutter support (29). The first cutter (30) is located above the second cutter (31). The first sensor is provided on the first cutter (30) and the second cutter (31). The distance between the first cutter (30) and the second cutter (31) should satisfy the following formula: L≥2H In the above formula, L is the distance between the first cutter (30) and the second cutter (31), and H is the maximum weft height of the cloth.

8. The control system for seam identification and tearing of open-width flexible fabrics according to claim 7, characterized in that: The cloth tearing device (10) further comprises a cutter rail (36), a cutter rack (37), and a cutter assembly drive motor (38); the cutter rail (36) and the cutter rack (37) are both arranged on a main body bracket (44); the cutter bracket (29) is arranged on the cutter rail (36); and the cutter assembly drive motor (38) is arranged on the cutter bracket (29) and connected to the cutter rack (37) via a gear.

9. The method for using a control system for seam identification and tearing of open-width flexible fabrics according to claim 8, characterized in that: The following steps are involved: S1. The fabric on the front stitching frame (1) is processed into the overfeed device. When the seam head to be torn (3) is separated from the seam head to be torn detection switch (42) monitoring position, the seam head to be torn detection switch (42) outputs an electrical signal to the lower machine; S2. The overfeeding belt encoder starts measuring the cloth travel distance from the time the signal from the detection switch (42) is lost. When the cloth travel distance measured by the overfeeding belt encoder is S1, the overfeeding seam head identifier (7) identifies the seam head to be torn (3). S1 should satisfy the following formula: S 前 ×(1-α)≤S1≤S 前 ×(1+β) In the above formula, S 前 is the actual distance between the seam head to be torn detection switch (42) and the overfeed seam head identifier, α is the positive overfeed rate, and β is the negative overfeed rate; S3. After the overfeed seam head identifier (7) identifies the seam head to be torn (3), the identification signal is transmitted to the cloth tearing tape encoder. When the cloth tearing tape encoder starts measuring the cloth tape distance S2, when the cloth tearing seam head identifier (8) identifies the seam head to be torn (3); S2 is represented as follows: S 后 =S2 In the above formula, S 后 is the actual distance between the overfeed seam end identifier (7) and the cloth tearing seam end identifier (8); S4. After the tearing seam head identifier (8) identifies the seam head to be torn (3), it transmits the identification signal to the tearing cloth tape encoder, and the tearing cloth tape encoder re-measures the cloth tape distance. When the tearing cloth tape encoder starts measuring the cloth tape distance S3, the seam head to be torn (3) is moved to the tearing cloth seam head positioning point; S3 is represented as follows S 定 =S3 In the above formula, S 定 is the actual distance between the cloth tearing seam end identifier (8) and the cloth tearing seam end positioning point, wherein the cloth tearing seam end positioning point is the midpoint between the first cutter (30) and the second cutter (31); S5. Turn off the traction motor (22) of the tape traction assembly (21), drive the first clamp assembly (27) to clamp the upper part of the seam head to be torn (3), and the second clamp assembly (28) to clamp the lower part of the seam head to be torn (3), start the cloth tearing drive motor (39) of the cloth tearing device (10), and move the clamp fixing part (18) and the clamp moving part (19) of the rotating cloth tearing clamp (13) toward the seam head to be torn (3) until the edge of the cloth is located between the fixed jaw (15) and the movable jaw (16), and the clamp cylinder (17) works to clamp the cloth with the fixed jaw (15) and the movable jaw (16), and then the first cutter (30) of the cutter assembly is turned on. ) cuts the edge of the cloth between the first clamping head assembly (27) and the rotary cloth-tearing clamping head (13), and the second cutter (31) cuts the edge of the cloth between the second clamping head assembly (28) and the rotary cloth-tearing clamping head (13), so that two cuts are formed on the edge of one side of the cloth; then the cloth-tearing driving motor (39) of the cloth-tearing device (10) drives the rotary cloth-tearing clamping head (13) to move along the cloth-tearing guide rail (14), and the clamp rotation driving mechanism (33) drives the rotary cloth-tearing clamping head (13) to rotate, so as to tear off the seam to be torn, ensuring that the linear speed of the outer periphery of the rotary cloth-tearing clamping head (13) is the same as the transverse movement speed of the rotary cloth-tearing clamping head (13) on the cloth-tearing assembly rail; S6. After the cloth tearing is completed, the chuck cylinder (17) drives its piston rod to extend, so that the movable jaw (16) moves away from the fixed jaw (15), and the torn seam head falls freely. The chuck rotation drive mechanism (33) and the linear travel drive work together to reset the rotary cloth tearing chuck (13); at the same time, the first chuck assembly (27) and the second chuck assembly (28) release the grip of the cloth, and the cloth head gripped by the second chuck assembly (28) falls freely into the material frame provided below the second chuck assembly (28) to store the cloth; the material frame provided below the second chuck assembly (28) is replaced with a new empty material frame for storing the next frame of cloth.

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