Tensionless unwinding device for microfiber leather and method thereof

Abstract

The application discloses a kind of superfine leather tensionless unwinding device and method thereof, it is related to unwinding technical field, including unwinding frame, the side of the unwinding frame is equipped with servo motor, the top of the unwinding frame is equipped with displacement driving part, the both sides of the unwinding frame are equipped with synchronous distance adjusting part connected with first piston barrel.The application is equipped with synchronous distance adjusting part, as the increase of superfine leather unwinding amount, C-shaped movable frame is moved up by driving rectangular sleeve rod through shift gear rack, worm, worm wheel, threaded rod, so that the distance between the release position of superfine leather and the upper guide roller of tension adjusting equipment is always equal, and then the inclination angle of superfine leather between unwinding roller and the upper guide roller of tension adjusting equipment is unchanged, the contact angle of superfine leather and the upper guide roller of tension adjusting equipment is consistent, and the tension can be evenly distributed along the width direction of cloth, avoiding the stretching deformation, tearing of superfine leather caused by excessive local stress, or wrinkles caused by local relaxation.

Description

Technical Field

[0001] This invention relates to the field of unwinding technology, specifically to a tension-free unwinding device and method for microfiber leather. Background Technology

[0002] Microfiber synthetic leather (microfiber leather for short) is a high-performance synthetic leather material. It uses island fiber nonwoven fabric as the base material, impregnates it with polyurethane slurry and then solidifies it by wet process to form island fiber / polyurethane composite material. Then, it is treated by fiber opening process (such as dissolution method, alkali reduction or toluene reduction) to turn island fiber into microfiber, and finally obtains microfiber / polyurethane composite material, that is, microfiber synthetic leather base fabric. During the processing of microfiber leather, the microfiber leather in the winding state needs to be unwound by an unwinding mechanism.

[0003] In general unwinding devices, to prevent the microfiber leather from stretching due to excessive tension, tension regulating equipment is used to adjust the tension on the microfiber leather during unwinding. As the microfiber leather is unwound, the distance between the edge of the microfiber leather and the center of the unwinding roller decreases. With continued unwinding, the angle between the microfiber leather and the roller on the tension regulating equipment increases. This leads to significant tension differences in different areas of the fabric. The side closer to the guide roller on the tension regulating equipment may be overstretched due to concentrated tension, while the side farther away from the guide roller may be loose due to insufficient tension. Furthermore, when the microfiber leather is tilted relative to the guide roller on the tension regulating equipment during release, the bending amplitude and friction of the fabric and the guide roller change with the tilt angle. Relying solely on the tension regulating equipment to adjust the tension of the microfiber leather during unwinding is ineffective, thus affecting the stability of the microfiber leather unwinding process. Summary of the Invention

[0004] In order to solve the problem that the angle between the microfiber leather and the guide roller on the tension adjustment device changes as the microfiber leather is released during the unwinding process, the present invention aims to provide a tension-free unwinding device and method for microfiber leather.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tension-free unwinding device for microfiber leather, comprising an unwinding frame, a servo motor mounted on one side of the unwinding frame, a drive disk connected to the output end of the servo motor, an unwinding roller bolted to one side of the drive disk, a positioning frame at the bottom of the unwinding frame, a first piston rod mounted at the bottom of the positioning frame, a first piston cylinder movably sleeved on the outer side of the first piston rod, a base connected to the bottom of the first piston cylinder, a support frame on one side of the base, a tension adjusting device mounted at the top of the support frame, a shifting drive component mounted at the top of the unwinding frame, a pressure roller connected to the top of the unwinding frame via the shifting drive component, and synchronous adjustment components connected to the first piston cylinder on both sides of the unwinding frame.

[0006] As a further embodiment of the present invention: the synchronous adjustment component includes guide rods installed on both sides of the top of the unwinding frame, a movable sleeve plate is movably sleeved on the guide rod, a telescopic spring connected to the guide rod is provided on the top of the movable sleeve plate, a splicing plate is connected between the two guide rods at the top of the unwinding frame, and a pressure roller is rotatably connected to one side of the movable sleeve plate and located above the unwinding roller.

[0007] As a further embodiment of the present invention: the synchronous adjustment component further includes a C-shaped movable frame installed on the side of the movable sleeve away from the pressure roller. A positioning rack is fixedly installed on the side of the C-shaped movable frame near the unwinding frame. A worm gear is rotatably connected to the outer wall of the unwinding frame. A transmission spur gear that meshes with the positioning rack is fixedly connected to both ends of the worm gear. A worm wheel that meshes with the worm gear is rotatably connected to the outer wall of the unwinding frame. A threaded rod is provided at the bottom of the worm wheel. A rectangular sleeve is movably sleeved on the outer side of the threaded rod. A second piston cylinder connected to the positioning frame is movably sleeved on the outer side of the rectangular sleeve. A second piston rod located inside the second piston cylinder is installed at the bottom of the rectangular sleeve. A flow guide hose connected to the first piston cylinder is provided at the bottom of the second piston cylinder. The second piston cylinder and the first piston cylinder are interconnected through the flow guide hose.

[0008] As a further embodiment of the present invention: the inner side of the rectangular sleeve is provided with a threaded hole that matches the threaded rod, and the top of the second piston cylinder is provided with a rectangular hole that fits the outer wall of the rectangular sleeve.

[0009] As a further embodiment of the present invention: the diameter of the second piston cylinder is equal to that of the first piston cylinder, and the bottom size of the first piston rod is equal to that of the second piston rod.

[0010] As a further embodiment of the present invention: the pressure roller is located directly above the unwinding roller, and the length of the pressure roller is less than the length of the unwinding roller.

[0011] As a further embodiment of the present invention: the displacement driving component includes a first cylinder installed on the top of the splicing plate, the output end of the first cylinder having a second locking hole, a C-shaped locking plate fixedly connected to the outer wall of the movable sleeve plate located outside the pressure roller, the top of the C-shaped locking plate being installed on a locking annular plate located below the first cylinder, a first locking hole extending to the other side of the locking annular plate being opened on one side of the locking annular plate, a second cylinder located on one side of the locking annular plate being provided on the top of the C-shaped locking plate, and a locking shaft extending into the first locking hole being connected to the output end of the second cylinder.

[0012] As a further aspect of the present invention: the inner diameter of the locking annular plate is larger than the output end diameter of the first cylinder.

[0013] As a further embodiment of the present invention: the diameter of the locking shaft is equal to the diameter of the second locking hole and the first locking hole, and the length of the locking shaft is greater than the outer wall diameter of the locking annular plate.

[0014] This invention also discloses a tension-free unwinding method for microfiber leather, which employs the aforementioned tension-free unwinding device for microfiber leather and includes the following steps:

[0015] S1: First, remove the unwinding roller from one end of the drive disc, and then place the rolled microfiber leather on the outside of the unwinding roller;

[0016] S2: Start the shift drive, and the operation of the shift drive will cause the pressure roller to move upward relative to the unwinding frame. During this process, the operation of the synchronous adjustment component will cause the positioning frame to move upward relative to the base.

[0017] S3: Connect both ends of the unwinding roller to the drive plate, and then pass one end of the microfiber leather through the roller shaft on the tension adjustment device. At this time, the release end of the microfiber leather is farthest from the center of the unwinding roller. Start the shift drive and make the pressure roller contact the top of the rolled microfiber leather through the operation of the shift drive.

[0018] S4: Start the servo motor, which drives the drive disk to rotate, causing the unwinding roller to unwind the microfiber leather. During this process, as the microfiber leather is released, the distance from the edge of the rolled microfiber leather to the center of the unwinding roller shortens. At the same time, because the pressure roller is in contact with the edge of the rolled microfiber leather, the pressure roller will also get closer and closer to the center of the unwinding roller as the amount of microfiber leather released increases. When the pressure roller moves towards the center of the unwinding roller, the unwinding frame moves downward relative to the base under the operation of the synchronous adjustment device, so that the release position of the microfiber leather is always at the same height, thus ensuring that the included angle between the released microfiber leather and the guide roller on the tension adjustment device is always equal.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. By setting a synchronous adjustment component, as the amount of microfiber leather unwinding increases, the distance from the edge of the rolled microfiber leather to the center of the unwinding roller will shorten. The C-shaped movable frame drives the rectangular sleeve rod to move upward through the shift rack, worm gear, worm wheel, and threaded rod. At this time, the space at the bottom of the second piston rod will increase, so that the distance between the microfiber leather release position and the guide roller on the tension adjustment device is always equal. This keeps the inclination angle of the microfiber leather between the unwinding roller and the guide roller on the tension adjustment device unchanged, and the contact angle between the microfiber leather and the guide roller on the tension adjustment device is consistent. The tension can be evenly distributed along the width of the fabric, avoiding the stretching deformation and tearing of the microfiber leather caused by excessive local force, or the wrinkles caused by local relaxation. At the same time, it also reduces the range of motion of the guide roller on the tension adjustment device.

[0021] 2. By setting up a shifting drive component, when pulling the pressure roller, the first cylinder is activated first. The extension of the first cylinder extends the output end of the first cylinder to the inside of the second locking hole. Then, the second cylinder is activated to move the locking shaft towards the locking ring plate, so that the locking shaft passes through the second locking hole. Then, the retraction of the first cylinder causes the C-shaped clamping plate to move the movable sleeve plate upward, causing the pressure roller to move upward. After the roll of microfiber leather is placed, the second cylinder is activated. The retraction of the second cylinder separates the locking shaft from the second and first locking holes, thereby causing the first cylinder to lose its connection with the locking ring plate. Under the elastic restoring force of the telescopic spring, the pressure roller moves downward along the guide rod, thereby adjusting the position of the pressure roller. Attached Figure Description

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

[0023] Figure 2 This is a schematic diagram showing the connection between the unwinding frame and the base of the present invention.

[0024] Figure 3 This is a schematic diagram showing the connection between the positioning frame and the pressure roller of the present invention.

[0025] Figure 4 This is a schematic diagram of the internal structure of the locking ring plate of the present invention.

[0026] Figure 5 This is a schematic diagram showing the connection between the locking shaft and the locking ring plate of the present invention.

[0027] Figure 6 This is a schematic diagram showing the connection between the second piston cylinder and the worm gear of the present invention.

[0028] Figure 7 This is a schematic diagram showing the connection between the first piston cylinder and the second piston cylinder of the present invention.

[0029] Figure 8 This is a side view of the present invention.

[0030] In the diagram: 1. Unwinding frame; 2. Positioning frame; 3. Base; 4. Support frame; 5. Tension adjustment device; 6. Servo motor; 7. Unwinding roller; 8. Drive disc; 9. First piston cylinder; 10. Second piston cylinder; 11. Rectangular sleeve rod; 12. Guide hose; 13. Splicing plate; 14. First cylinder; 15. Pressing roller; 16. Guide rod; 17. C-shaped movable frame; 18. Telescopic spring; 19. Worm gear; 20. Threaded rod; 21. C-shaped clamping plate; 22. Second cylinder; 23. Locking shaft; 24. First locking hole; 25. Movable sleeve plate; 26. Locking annular plate; 27. Second locking hole; 28. First piston rod; 29. ​​Worm gear; 30. Transmission spur gear; 31. Positioning rack; 32. Second piston rod. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0033] Please see Figures 1 to 8 In this embodiment of the invention, a tension-free unwinding device for microfiber leather includes an unwinding frame 1. A servo motor 6 is installed on one side of the unwinding frame 1. The output end of the servo motor 6 is connected to a drive disk 8. An unwinding roller 7 is bolted to one side of the drive disk 8. A positioning frame 2 is provided at the bottom of the unwinding frame 1. A first piston rod 28 is installed at the bottom of the positioning frame 2. A first piston cylinder 9 is movably sleeved on the outer side of the first piston rod 28. A base 3 is connected to the bottom of the first piston cylinder 9. A support frame 4 is provided on one side of the base 3. A tension adjusting device 5 is installed at the top of the support frame 4. A shifting drive is installed at the top of the unwinding frame 1. A pressure roller 15 is connected to the top of the unwinding frame 1 through the shifting drive. Synchronous adjustment components connected to the first piston cylinder 9 are provided on both sides of the unwinding frame 1.

[0034] In this embodiment: First, the unwinding roller 7 is removed from one end of the drive disk 8. Then, the rolled microfiber leather is placed on the outside of the unwinding roller 7. The shifting drive is activated, and the operation of the shifting drive causes the pressure roller 15 to move upward relative to the unwinding frame 1. During this process, the operation of the synchronous adjustment device causes the positioning frame 2 to move upward relative to the base 3. Then, both ends of the unwinding roller 7 are connected to the drive disk 8. Subsequently, one end of the microfiber leather is passed through the roller shaft on the tension adjustment device 5. At this time, the release end of the microfiber leather is farthest from the center of the unwinding roller 7. The shifting drive is activated, and the operation of the shifting drive causes the pressure roller 15 to contact the top of the rolled microfiber leather. Then, the servo motor 6 is activated, and the servo motor... Motor 6 drives the drive disc 8 to rotate, causing the unwinding roller 7 to unwind the microfiber leather. During this process, as the microfiber leather is released, the distance from the edge of the rolled microfiber leather to the center of the unwinding roller 7 shortens. At the same time, since the pressure roller 15 is in contact with the edge of the rolled microfiber leather, the pressure roller 15 will also get closer and closer to the center of the unwinding roller 7 as the amount of microfiber leather released increases. When the pressure roller 15 moves towards the center of the unwinding roller 7, the unwinding frame 1 moves downward relative to the base 3 under the operation of the synchronous adjustment device, so that the release position of the microfiber leather is always at the same height, and thus the included angle formed between the released microfiber leather and the guide roller on the tension adjustment device 5 is always equal.

[0035] Please refer to this carefully. Figure 1 , Figure 3 , Figure 6 , Figure 7 The synchronous adjustment component includes guide rods 16 installed on both sides of the top of the unwinding frame 1. A movable sleeve plate 25 is movably sleeved on the guide rods 16. A telescopic spring 18 connected to the guide rods 16 is provided on the top of the movable sleeve plate 25. A splicing plate 13 is connected between the two guide rods 16 at the top of the unwinding frame 1. The pressure roller 15 is rotatably connected to one side of the movable sleeve plate 25 and is located above the unwinding roller 7.

[0036] The synchronous adjustment component also includes a C-shaped movable frame 17 installed on the side of the movable sleeve plate 25 away from the pressure roller 15. A positioning rack 31 is fixedly installed on the side of the C-shaped movable frame 17 near the unwinding frame 1. A worm 29 is rotatably connected to the outer wall of the unwinding frame 1. A transmission spur gear 30 that meshes with the positioning rack 31 is fixedly connected to both ends of the worm 29. A worm wheel 19 that meshes with the worm 29 is rotatably connected to the outer wall of the unwinding frame 1. A threaded rod 20 is provided at the bottom of the worm wheel 19. A rectangular sleeve 11 is movably sleeved on the outside of the threaded rod 20. A second piston cylinder 10 connected to the positioning frame 2 is movably sleeved on the outside of the rectangular sleeve 11. A second piston rod 32 located inside the second piston cylinder 10 is installed at the bottom of the rectangular sleeve 11. A flow guide hose 12 connected to the first piston cylinder 9 is provided at the bottom of the second piston cylinder 10. The second piston cylinder 10 and the first piston cylinder 9 are interconnected through the flow guide hose 12.

[0037] The rectangular sleeve 11 has a threaded hole on its inner side that matches the threaded rod 20. The top of the second piston cylinder 10 has a rectangular hole that matches the outer wall of the rectangular sleeve 11. The diameter of the second piston cylinder 10 is the same as that of the first piston cylinder 9. The bottom size of the first piston rod 28 is the same as that of the second piston rod 32. The pressure roller 15 is located directly above the unwinding roller 7. The length of the pressure roller 15 is less than that of the unwinding roller 7.

[0038] In this embodiment: Before installing the rolled microfiber leather, the pressure roller 15 is moved away from the center of the drive disc 8 by the displacement drive component, causing the movable sleeve 25 to move upward along the guide rod 16, thereby causing the telescopic spring 18 to retract. At the same time, the C-shaped movable frame 17 moves with the upward movement of the movable sleeve 25, thereby causing the shift rack 31 to drive the worm gear 29 to rotate through the transmission spur gear 30. When the worm gear 29 rotates, it drives the threaded rod 20 to rotate through the worm wheel 19, causing the rectangular sleeve 11 to move downward along the threaded rod 20. During this process, the rectangular sleeve 11 will squeeze the aqueous solution inside the second piston cylinder 10 through the second piston rod 32, thereby squeezing the aqueous solution inside the second piston cylinder 10 into the first piston cylinder 9. At this time, the first piston rod 28 will be pushed upward relative to the first piston cylinder 9 by the aqueous solution entering the first piston cylinder 9, so as to make the pressure roller 15 and the unwinding frame 1 move upward synchronously. After the microfiber leather is placed, the pressure roller 15 is released from its limit by the displacement drive component. At this time, the pressure roller 15 will be under the elastic restoring force of the telescopic spring 18. The bottom of the roll of microfiber leather remains in contact with the top of the roll. As the amount of microfiber leather unwound increases, the distance from the edge of the roll to the center of the unwound roller 7 shortens. At this time, the movable sleeve 25, under the action of the telescopic spring 18, drives the pressure roller 15 to move downward along the guide rod 16, causing the C-shaped movable frame 17 to move upward through the shift rack 31, worm 29, worm wheel 19, and threaded rod 20, thereby increasing the space at the bottom of the second piston rod 32. This allows the first piston rod 28 to pass some of the aqueous solution inside the first piston cylinder 9 through... The flow guide hose 12 is pushed into the second piston cylinder 10, causing the unwinding frame 1 to move downward as a whole. This ensures that the distance between the microfiber leather release position and the upper guide roller of the tension adjustment device 5 remains equal. Consequently, the tilt angle of the microfiber leather between the unwinding roller 7 and the upper guide roller of the tension adjustment device 5 remains unchanged, and the contact angle between the microfiber leather and the upper guide roller of the tension adjustment device 5 is consistent. This allows the tension to be evenly distributed along the width of the fabric, avoiding excessive local stress that could cause the microfiber leather to stretch, deform, or tear, or local loosening that could cause wrinkles. It also reduces the range of motion of the upper guide roller of the tension adjustment device 5.

[0039] Please refer to this carefully. Figure 1 , Figure 2 , Figure 4 , Figure 5The shifting drive includes a first cylinder 14 mounted on the top of the splicing plate 13. The output end of the first cylinder 14 is provided with a second locking hole 27. The outer wall of the movable sleeve plate 25 is fixedly connected to a C-shaped locking plate 21 located outside the pressure roller 15. The top of the C-shaped locking plate 21 is mounted on a locking annular plate 26 located below the first cylinder 14. One side of the locking annular plate 26 is provided with a first locking hole 24 extending to the other side of the locking annular plate 26. The top of the C-shaped locking plate 21 is provided with a second cylinder 22 located on one side of the locking annular plate 26. The output end of the second cylinder 22 is connected to a locking shaft 23 extending into the first locking hole 24.

[0040] The inner diameter of the locking ring plate 26 is larger than the output end diameter of the first cylinder 14, the diameter of the locking shaft 23 is equal to the diameter of the second locking hole 27 and the first locking hole 24, and the length of the locking shaft 23 is greater than the outer diameter of the locking ring plate 26.

[0041] In this embodiment: when pulling the pressure roller 15, the first cylinder 14 is activated first. The extension of the first cylinder 14 extends the output end of the first cylinder 14 to the inside of the second locking hole 27. Then, the second cylinder 22 is activated to move the locking shaft 23 toward the locking ring plate 26, so that the locking shaft 23 passes through the second locking hole 27. Then, the retraction of the first cylinder 14 causes the C-shaped clamping plate 21 to move the movable sleeve plate 25 upward, so that the pressure roller 15 moves upward. After the roll of microfiber leather is placed, the second cylinder 22 is activated. The retraction of the second cylinder 22 separates the locking shaft 23 from the second locking hole 27 and the first locking hole 24, so that the first cylinder 14 loses its connection with the locking ring plate 26, and the pressure roller 15 moves downward along the guide rod 16 under the elastic restoring force of the telescopic spring 18.

[0042] The following describes a tension-free unwinding method for microfiber leather, based on the aforementioned tension-free unwinding device, which includes the following steps:

[0043] S1: First, remove the unwinding roller 7 from one end of the drive disc 8, and then place the rolled microfiber leather on the outside of the unwinding roller 7.

[0044] S2: Start the first cylinder 14. The extension of the first cylinder 14 extends the output end of the first cylinder 14 to the inside of the second locking hole 27. Then, start the second cylinder 22 to move the locking shaft 23 toward the locking annular plate 26, so that the locking shaft 23 passes through the second locking hole 27. Then, the retraction of the first cylinder 14 causes the C-shaped locking plate 21 to move the movable sleeve plate 25 upward, so that the pressure roller 15 moves upward. During this process, the rectangular sleeve rod 11 will squeeze the aqueous solution inside the second piston cylinder 10 through the second piston rod 32, thereby squeezing the aqueous solution inside the second piston cylinder 10 into the first piston cylinder 9. At this time, the first piston rod 28 will be pushed by the aqueous solution entering the first piston cylinder 9 and move upward relative to the first piston cylinder 9, so that the pressure roller 15 and the unwinding frame 1 move upward synchronously.

[0045] S3: Connect both ends of the unwinding roller 7 to the drive disk 8, and then pass one end of the microfiber leather through the roller shaft on the tension adjustment device 5. At this time, the release end of the microfiber leather is farthest from the center of the unwinding roller 7. Start the second cylinder 22. The locking shaft 23 is separated from the second locking hole 27 and the first locking hole 24 by the contraction of the second cylinder 22. This causes the first cylinder 14 to lose its connection with the locking ring plate 26, so that the pressure roller 15 moves down along the guide rod 16 under the action of the elastic restoring force of the telescopic spring 18, so that the pressure roller 15 contacts the top of the rolled microfiber leather.

[0046] S4: Start the servo motor 6. The servo motor 6 drives the drive disk 8 to rotate, causing the unwinding roller 7 to unwind the microfiber leather. During this process, as the microfiber leather is released, the distance from the edge of the rolled microfiber leather to the center of the unwinding roller 7 shortens. At the same time, because the pressure roller 15 is in contact with the edge of the rolled microfiber leather, the pressure roller 15 will also get closer and closer to the center of the unwinding roller 7 as the amount of microfiber leather released increases. This causes the C-shaped movable frame 17 to drive the rectangular sleeve rod 11 to move upward through the shift rack 31, worm 29, worm wheel 19, and threaded rod 20. At this time, the space at the bottom of the second piston rod 32 will increase, thereby allowing the second piston rod 32 to move upward. A piston rod 28 pushes part of the aqueous solution inside the first piston cylinder 9 into the second piston cylinder 10 through the guide hose 12, causing the unwinding frame 1 to move downward as a whole. This ensures that the distance between the microfiber leather release position and the upper guide roller of the tension adjustment device 5 remains equal, thereby keeping the inclination angle of the microfiber leather between the unwinding roller 7 and the upper guide roller of the tension adjustment device 5 unchanged. The contact angle between the microfiber leather and the upper guide roller of the tension adjustment device 5 is consistent, and the tension can be evenly distributed along the width direction of the fabric. This avoids excessive local stress that could cause the microfiber leather to stretch, deform, or tear, or local relaxation that could cause wrinkles. It also reduces the range of motion of the upper guide roller of the tension adjustment device 5.

[0047] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tension-free unwinding device for microfiber leather, comprising an unwinding frame (1), characterized in that, A servo motor (6) is installed on one side of the unwinding frame (1). The output end of the servo motor (6) is connected to a drive disk (8). An unwinding roller (7) is bolted to one side of the drive disk (8). A positioning frame (2) is provided at the bottom of the unwinding frame (1). A first piston rod (28) is installed at the bottom of the positioning frame (2). A first piston cylinder (9) is movably sleeved on the outside of the first piston rod (28). A base (3) is connected to the bottom of the first piston cylinder (9). A support frame (4) is provided on one side of the base (3). A tension adjustment device (5) is installed at the top of the support frame (4). A shifting drive is installed at the top of the unwinding frame (1). A pressure roller (15) is connected to the top of the unwinding frame (1) through the shifting drive. Synchronous adjustment components connected to the first piston cylinder (9) are provided on both sides of the unwinding frame (1). The synchronous adjustment component includes guide rods (16) installed on both sides of the top of the unwinding frame (1). A movable sleeve plate (25) is movably sleeved on the guide rod (16). A telescopic spring (18) connected to the guide rod (16) is provided on the top of the movable sleeve plate (25). A splicing plate (13) is connected between the two guide rods (16) at the top of the unwinding frame (1). The pressure roller (15) is rotatably connected to one side of the movable sleeve plate (25) and located above the unwinding roller (7). The synchronous adjustment component also includes a C-shaped movable frame (17) installed on the side of the movable sleeve plate (25) away from the pressure roller (15). A shift rack (31) is fixedly installed on the side of the C-shaped movable frame (17) near the unwinding frame (1). A worm (29) is rotatably connected to the outer wall of the unwinding frame (1). Both ends of the worm (29) are fixedly connected to transmission spur gears (30) that mesh with the shift rack (31). A worm wheel (19) that meshes with the worm (29) is rotatably connected to the outer wall of the unwinding frame (1). The bottom of the worm wheel (19) The part is provided with a threaded rod (20), and a rectangular sleeve rod (11) is movably sleeved on the outside of the threaded rod (20). A second piston cylinder (10) connected to the positioning frame (2) is movably sleeved on the outside of the rectangular sleeve rod (11). A second piston rod (32) located inside the second piston cylinder (10) is installed at the bottom of the rectangular sleeve rod (11). A flow guide hose (12) connected to the first piston cylinder (9) is provided at the bottom of the second piston cylinder (10). The second piston cylinder (10) and the first piston cylinder (9) are interconnected through the flow guide hose (12).

2. The tension-free unwinding device for microfiber leather according to claim 1, characterized in that, The inner side of the rectangular sleeve (11) is provided with a threaded hole that matches the threaded rod (20), and the top of the second piston cylinder (10) is provided with a rectangular hole that matches the outer wall of the rectangular sleeve (11).

3. The tension-free unwinding device for microfiber leather according to claim 1, characterized in that, The second piston cylinder (10) has the same diameter as the first piston cylinder (9), and the bottom of the first piston rod (28) has the same size as the bottom of the second piston rod (32).

4. The tension-free unwinding device for microfiber leather according to claim 1, characterized in that, The pressure roller (15) is located directly above the unwinding roller (7), and the length of the pressure roller (15) is less than the length of the unwinding roller (7).

5. The tension-free unwinding device for microfiber leather according to claim 1, characterized in that, The shifting drive includes a first cylinder (14) installed on the top of the splicing plate (13). The output end of the first cylinder (14) is provided with a second locking hole (27). The outer wall of the movable sleeve plate (25) is fixedly connected to a C-shaped locking plate (21) located outside the pressure roller (15). The top of the C-shaped locking plate (21) is installed on the locking ring plate (26). The locking ring plate (26) is located below the first cylinder (14). One side of the locking ring plate (26) is provided with a first locking hole (24) that extends to the other side of the locking ring plate (26). The top of the C-shaped locking plate (21) is provided with a second cylinder (22) located on one side of the locking ring plate (26). The output end of the second cylinder (22) is connected to a locking shaft (23) extending into the first locking hole (24).

6. The tension-free unwinding device for microfiber leather according to claim 5, characterized in that, The inner diameter of the locking annular plate (26) is greater than the output diameter of the first cylinder (14).

7. The tension-free unwinding device for microfiber leather according to claim 5, characterized in that, The diameter of the locking shaft (23) is equal to the diameter of the second locking hole (27) and the first locking hole (24), and the length of the locking shaft (23) is greater than the outer wall diameter of the locking ring plate (26).

8. A tension-free unwinding method for microfiber leather, employing the tension-free unwinding device for microfiber leather as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: First, remove the unwinding roller (7) from one end of the drive disc (8), and then place the rolled microfiber leather on the outside of the unwinding roller (7); S2: Start the shift drive, and the pressure roller (15) moves upward relative to the unwinding frame (1) by the operation of the shift drive. During this process, the positioning frame (2) moves upward relative to the base (3) by the operation of the synchronous adjustment component. S3: Connect both ends of the unwinding roller (7) to the drive disk (8), and then pass one end of the microfiber leather through the roller shaft on the tension adjustment device (5). At this time, the release end of the microfiber leather is furthest from the center of the unwinding roller (7). Start the shift drive and make the pressure roller (15) contact the top of the rolled microfiber leather through the operation of the shift drive. S4: Start the servo motor (6), and drive the drive disk (8) to rotate so that the unwinding roller (7) can unwind the microfiber leather. During this process, as the microfiber leather is released, the distance from the edge of the rolled microfiber leather to the center of the unwinding roller (7) is shortened. At the same time, since the pressure roller (15) is in contact with the edge of the rolled microfiber leather, the pressure roller (15) will also get closer and closer to the center of the unwinding roller (7) as the amount of microfiber leather released increases. When the pressure roller (15) moves toward the center of the unwinding roller (7), the unwinding frame (1) moves down relative to the base (3) under the operation of the synchronous adjustment device, so that the release position of the microfiber leather is always at the same height, and thus the included angle formed between the released microfiber leather and the guide roller on the tension adjustment device (5) is always equal.

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