Magic tape automatic fixed-length sewing integrated machine

Abstract

The application discloses a magic tape automatic fixed-length sewing integrated machine, which comprises a sewing frame, a material belt feeding device, a tension detection device, a fixed-length cutting device, a material taking and transferring device and a sewing device, wherein the material belt feeding device, the tension detection device, the fixed-length cutting device, the material taking and transferring device and the sewing device are arranged on the sewing frame. The magic tape automatic fixed-length sewing integrated machine can realize full automation of feeding, fixed-length, cutting and sewing of the magic tape material belt.

Description

Technical Field

[0001] This invention relates to automatic sewing equipment, and more particularly to an automatic fixed-length sewing machine for Velcro. Background Technology

[0002] Currently, the sewing of hook and loop fasteners on the market is all done manually by feeding and cutting the material, and then manually placing the cut hook and loop fasteners into the mold. This requires highly skilled workers, and new employees generally do not know how to operate it. The degree of automation is low, and the production efficiency is low. Summary of the Invention

[0003] To address the shortcomings of the prior art, this invention provides an automatic fixed-length sewing machine for hook and loop fasteners, which can achieve fully automated feeding, length setting, cutting, and sewing of hook and loop fastener tape.

[0004] The technical problem to be solved by the present invention is achieved through the following technical solution:

[0005] An automatic fixed-length sewing machine for Velcro is characterized by comprising a sewing machine frame, a tape feeding device, a tension detection device, a fixed-length cutting device, a material picking and conveying device, and a sewing device, wherein the tape feeding device, tension detection device, fixed-length cutting device, material picking and conveying device, and sewing device are all mounted on the sewing machine frame; wherein...

[0006] The tape feeding device is used to load the hook and loop tape and feed the hook and loop tape out.

[0007] The tension detection device is used to detect the tension of the hook and loop tape delivered by the tape release device, and then adjust the tape release speed of the tape release device so that the tension of the hook and loop tape remains constant and is located between the tape release device and the fixed-length cutting device.

[0008] The fixed-length cutting device is used to cut the Velcro tape delivered by the tape feeding device to a fixed length.

[0009] The material handling and transfer device is used to transfer the Velcro tape cut by the fixed-length cutting device to the sewing device, and is located between the fixed-length cutting device and the sewing device;

[0010] The sewing device is used to sew the Velcro tape conveyed by the material handling device to the material.

[0011] Furthermore, the tape feeding device includes a tape feeding reel, a friction wheel mechanism, and a tape feeding drive mechanism. There are two friction wheel mechanisms, which respectively rub against both ends of the tape feeding reel. The tape feeding drive mechanism is connected to one of the friction wheel mechanisms to drive the friction wheel mechanism to rotate the tape feeding reel and feed the tape. The friction wheel mechanism includes a tape feeding fixing plate, a first friction wheel, and a second friction wheel. The tape feeding reel, the first friction wheel, and the second friction wheel are all connected to the same side of the tape feeding fixing plate through corresponding rotating shafts. The rotating shafts of the first friction wheel and the second friction wheel are parallel to the rotating shaft of the tape feeding reel, and the surfaces of the first friction wheel and the second friction wheel rub against the surface of the tape feeding reel.

[0012] Furthermore, the tension detection device includes a tension fixing frame, a fixed tension guide rod, a lifting tension guide rod, and a height sensor. The fixed tension guide rod and the lifting tension guide rod are both horizontally arranged on the tension fixing frame. There are two fixed tension guide rods, and the lifting tension guide rod is arranged in a triangle with the two fixed tension guide rods. The Velcro tape wraps around from above one fixed tension guide rod to below the lifting tension guide rod, and then around to above the other fixed tension guide rod. The height sensor is arranged opposite to the lifting tension guide rod and is used to sense the actual height relative to the lifting tension guide rod.

[0013] Furthermore, during tension adjustment, when the height sensor detects that the actual height of the lifting tension guide rod is greater than the preset height, it sends feedback to the controller. Upon receiving the feedback, the controller controls the tape unloading device to increase the unloading speed, causing the lifting tension guide rod to descend and return to the preset height. Conversely, when the height sensor detects that the actual height of the lifting tension guide rod is less than the preset height, it sends feedback to the controller. Upon receiving the feedback, the controller controls the tape unloading device to decrease the unloading speed, causing the lifting tension guide rod to rise and return to the preset height, ultimately maintaining the lifting tension guide rod at the preset height without rising or falling.

[0014] Furthermore, the fixed-length cutting device includes a mounting base and a feeding mechanism, a cutting mechanism, and a clamping mechanism sequentially arranged on the mounting base along the discharge direction of the tension detection device, wherein...

[0015] The feeding mechanism is used to sequentially feed hook and loop tape of a predetermined length to the cutting mechanism and the clamping mechanism. It includes a feeding friction wheel, an auxiliary pressure wheel, a fixed-length driver, and a pressure wheel lifter. The feeding friction wheel and the auxiliary pressure wheel are arranged opposite each other. The pressure wheel lifter is connected to the pressure wheel lifter and is lifted and lowered under the drive of the pressure wheel lifter. It then cooperates with the feeding friction wheel to press or release the hook and loop tape. The feeding friction wheel is connected to the fixed-length driver and is rotated under the drive of the fixed-length driver. It then drives the hook and loop tape forward through friction.

[0016] The cutting mechanism is used to cut the Velcro tape fed by the tape feeding mechanism. It includes a cutting table, a cutting blade, and a cutting driver. The cutting table and the cutting blade are arranged vertically opposite each other. The cutting table is provided with a cutting groove for the cutting blade to pass through. The cutting blade is connected to the cutting driver so that it can move up and down under the drive of the cutting driver, thereby cutting the Velcro tape located on the cutting table.

[0017] The clamping mechanism is used to clamp the hook and loop tape before it is cut. It includes a fixed clamping plate, a movable clamping plate, and a clamping driver. The fixed clamping plate and the movable clamping plate are arranged opposite each other vertically. The movable clamping plate 442 is connected to the clamping driver so that it can move up and down under the drive of the clamping driver, thereby cooperating with the fixed clamping plate to clamp or release the hook and loop tape.

[0018] Furthermore, the fixing clamp includes a first fixing clamping part, a second fixing clamping part, and a first connecting part. The first fixing clamping part extends in the left-right direction, and its left-right width is equal to or greater than the width of the hook and loop tape. The second fixing clamping part extends in the front-back direction, and its left-right width is less than the width of the hook and loop tape. The second fixing clamping part and the first connecting part are both connected to the end of the first fixing clamping part away from the material handling and transfer device, wherein the second fixing clamping part and the first fixing clamping part are perpendicular to each other. The first connecting part is fixedly connected to the cutting table of the tape cutting mechanism.

[0019] The movable clamping plate includes a first movable clamping part, a second movable clamping part, and a second connecting part. The first movable clamping part extends in a left-right direction, and its left-right width is equal to or greater than the width of the hook and loop tape. The second movable clamping part extends in a front-back direction, and its left-right width is less than the width of the hook and loop tape. Both the second movable clamping part and the second connecting part are connected to the end of the first movable clamping part away from the material handling and transfer device, wherein the second movable clamping part and the first movable clamping part are perpendicular to each other. The second connecting part is fixedly connected to the clamping drive.

[0020] The first fixed clamping part and the first movable clamping part are arranged vertically opposite each other to clamp or release the entire end of the hook and loop tape near the cutting mechanism. The second fixed clamping part and the second movable clamping part are arranged vertically opposite each other to clamp or release the side of the hook and loop tape away from the cutting mechanism and away from the material picking and transferring device. The side of the hook and loop tape away from the cutting mechanism and near the material picking and transferring device is exposed for the material picking and transferring device to pick up.

[0021] Furthermore, the material handling and conveying device includes a material handling gripper and a gripper translation mechanism. The material handling gripper is mounted on the gripper translation mechanism to move left and right under the drive of the gripper translation mechanism. The material handling gripper includes a clamping part and a connecting part. The clamping part extends in the left-right direction, and the connecting part extends in the front-back direction. The clamping part is vertically connected to one end of the connecting part, and the other end of the connecting part is provided with an opening cylinder and is fixedly connected to the gripper translation mechanism. The connecting part is arranged left-right opposite to the second fixed clamping part and the second movable clamping part, and the clamping part is arranged front-back opposite to the first fixed clamping part and the first movable clamping part.

[0022] Furthermore, the sewing device includes a sewing needle plate, a material clamping mechanism, a two-dimensional moving mechanism, a sewing machine head, and a presser foot mechanism. The material clamping mechanism, sewing machine head, and presser foot mechanism are all located above the sewing needle plate, and the two-dimensional moving mechanism is connected to the material clamping mechanism; wherein...

[0023] The clamping mechanism is used to clamp the material above the sewing needle plate. It includes a clamping base, a hollow base plate, a pressure frame, a lifting guide rail assembly, and a pressure driver. The hollow base plate is connected to the lower side of the clamping base. The pressure frame is movably connected to the upper side of the clamping base through the lifting guide rail assembly. The pressure frame and the hollow base plate are arranged opposite each other. The pressure driver is arranged on the clamping base and drives the pressure frame to move up and down, so that the pressure frame and the hollow base plate cooperate to clamp or release the material.

[0024] The two-dimensional moving mechanism is used to drive the clamping mechanism to move in two dimensions on the sewing plane according to the sewing trajectory;

[0025] The sewing head, including a needle, is used to sew the Velcro tape together with the material.

[0026] The presser foot mechanism is used to press the material located below the needle onto the sewing needle plate, and is positioned below the needle.

[0027] Furthermore, the material handling and conveying device is disposed on the pressure frame, and the fixed-length cutting device is disposed on the clamping seat.

[0028] Furthermore, the sewing machine frame includes a fixed upright, a movable machine platform, and a machine platform translation mechanism. The machine platform translation mechanism is mounted on the fixed upright, and the movable machine platform is mounted on the machine platform translation mechanism. The machine platform translation mechanism is used to drive the movable machine platform to move back and forth relative to the fixed upright. The feeding device and tension detection device are mounted on the fixed upright, and the fixed-length cutting device, material picking and conveying device, and sewing device are all mounted on the movable machine platform.

[0029] The present invention has the following beneficial effects: The automatic fixed-length sewing machine for hook and loop fasteners of the present invention, through the cooperation of the tape feeding device, tension detection device, fixed-length cutting device, material picking and conveying device, and sewing device, allows the hook and loop fastener tape to be fed out by the tape feeding device and then enter the fixed-length cutting device after passing through the tension detection device. The tension detection device detects and adjusts the tension of the hook and loop fastener tape to ensure that the tape maintains constant tension after being released, so as to prevent the fixed-length accuracy of the fixed-length cutting device from being affected by the elastic expansion and contraction of the tape. After being fixed and cut by the fixed-length cutting device, the tape is then sent to the sewing device by the material picking and conveying device to be sewn together with the material. This achieves fully automated tape feeding, fixed-length cutting, and sewing of the hook and loop fastener tape, reducing the operational requirements for workers and improving production efficiency. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of the automatic fixed-length sewing machine for Velcro provided by the present invention.

[0031] Figure 2 This is a schematic diagram of the sewing machine frame in the automatic fixed-length sewing machine with Velcro provided by the present invention.

[0032] Figure 3 This is a schematic diagram of the material feeding device in the automatic fixed-length sewing machine for Velcro provided by the present invention.

[0033] Figure 4 This is a schematic diagram of the tension detection device in the automatic fixed-length sewing machine for Velcro provided by the present invention.

[0034] Figure 5 This is a schematic diagram of the tension detection device in the automatic fixed-length sewing machine for Velcro provided by the present invention.

[0035] Figure 6This is a schematic diagram of the structure of the fixed-length cutting device and the material handling and transfer device in the automatic fixed-length sewing machine for Velcro provided by the present invention.

[0036] Figure 7 An exploded view of the length-cutting device in the automatic fixed-length sewing machine for Velcro provided by the present invention.

[0037] Figure 8 This is an exploded view of the clamping mechanism in the automatic fixed-length sewing machine for Velcro provided by the present invention.

[0038] Figure 9 This is a schematic diagram of the sewing device in the automatic fixed-length sewing machine for Velcro provided by the present invention.

[0039] Figure 10 This is a schematic diagram of the clamping mechanism in the automatic fixed-length sewing machine for Velcro provided by the present invention. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this invention.

[0042] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this invention, "multiple" means two or more, unless otherwise explicitly specified.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] Example 1

[0045] like Figure 1 As shown, an automatic Velcro fixed-length sewing machine includes a sewing machine frame 100, a tape feeding device 200, a tension detection device 300, a fixed-length cutting device 400, a material picking and conveying device 500, and a sewing device 600. The tape feeding device 200, tension detection device 300, fixed-length cutting device 400, material picking and conveying device 500, and sewing device 600 are all mounted on the sewing machine frame 100.

[0046] The tape feeding device 200 is used to load the hook and loop tape and feed the hook and loop tape out.

[0047] The tension detection device 300 is used to detect the tension of the Velcro tape delivered by the tape release device 200, and then adjust the release speed of the tape release device 200 so that the tension of the Velcro tape remains constant and is located between the tape release device 200 and the fixed-length cutting device 400.

[0048] The fixed-length cutting device 400 is used to cut the Velcro strip delivered by the strip feeding device 200 to a fixed length.

[0049] The material handling and transfer device 500 is used to transfer the Velcro strip cut by the fixed-length cutting device 400 to the sewing device 600, and is located between the fixed-length cutting device 400 and the sewing device 600.

[0050] The sewing device 600 is used to sew the Velcro strip transferred by the material handling device 500 together with the material.

[0051] The automatic fixed-length sewing machine for hook and loop fasteners of the present invention achieves fully automated feeding, length setting, cutting, and sewing of the hook and loop fastener tape through the cooperation of the tape feeding device 200, tension detection device 300, fixed-length cutting device 400, material handling and transfer device 500, and sewing device 600. After being fed out by the tape feeding device 200, the hook and loop fastener tape passes through the tension detection device 300 and enters the fixed-length cutting device 400. The tension detection device 300 detects and adjusts the tension of the hook and loop fastener tape to maintain a constant tension after it is released, preventing the elastic expansion and contraction of the tape from affecting the length setting accuracy of the fixed-length cutting device 400. After being length-set and cut by the fixed-length cutting device 400, the hook and loop fastener tape is then transported by the material handling and transfer device 500 to the sewing device 600 to be sewn together with the material. This fully automated feeding, length setting, cutting, and sewing of the hook and loop fastener tape reduces the operational requirements for workers and improves production efficiency.

[0052] During operation, the material can be manually fed into the sewing device 600 by the worker or automatically fed into the sewing device 600 by an automatic feeding device; there is no limitation on this.

[0053] In this embodiment, the tape feeding device 200 is located below the sewing device 600, the tension detection device 300 is located behind one side of the sewing device 600, and the fixed-length cutting device 400 is located beside one side of the sewing device 600 and is arranged in a corresponding manner to the tension detection device 300.

[0054] like Figure 3 As shown, the tape feeding device 200 includes a tape feeding reel 210, a friction wheel mechanism 220, and a tape feeding drive mechanism 230. There are two friction wheel mechanisms 220, which respectively rub against both ends of the tape feeding reel 210. The tape feeding drive mechanism 230 is connected to one of the friction wheel mechanisms 220 to drive the friction wheel mechanism 220 to rotate the tape feeding reel 210 to feed the tape.

[0055] The friction wheel mechanism 220 includes a tape feeding fixing plate 221, a first friction wheel 222, and a second friction wheel 223. The tape feeding spool 210, the first friction wheel 222, and the second friction wheel 223 are all connected to the same side of the tape feeding fixing plate 221 through corresponding rotating shafts. The rotating shafts of the first friction wheel 222 and the second friction wheel 223 are parallel to the rotating shaft of the tape feeding spool 210. The surfaces of the first friction wheel 222 and the second friction wheel 223 rub against and abut against the surface of the tape feeding spool 210.

[0056] When at least one of the first friction wheel 222 and the second friction wheel 223 rotates, the tape reel 210 will also rotate under the friction of the first friction wheel 222 or the second friction wheel 223, thereby feeding out the Velcro tape.

[0057] The tape feeding drive mechanism 230 is disposed on the other side of the tape feeding fixing plate 221, and includes a speed-regulating motor 231, a driving wheel 232, a driven wheel 233, and a transmission belt 234. The driving wheel 232 is coaxially disposed on the output shaft of the speed-regulating motor 231 and coaxially disposed on the rotating shaft of the first friction wheel 222. The transmission belt 234 is sleeved and connected between the driving wheel 232 and the driven wheel 233.

[0058] The speed of the speed-regulating motor 231 is adjustable. By adjusting the speed of the speed-regulating motor 231, the rotational speed of the tape unwinding reel 210 can be controlled, thereby controlling the tape unwinding speed of the tape unwinding drive mechanism 230.

[0059] like Figure 4 and 5 As shown, the tension detection device 300 includes a tension fixing frame 310, a fixed tension guide rod 320, a lifting tension guide rod 330, and a height sensor 340. The fixed tension guide rod 320 and the lifting tension guide rod 330 are both horizontally arranged on the tension fixing frame 310. There are two fixed tension guide rods 320, and the lifting tension guide rod 330 is arranged in a triangle with the two fixed tension guide rods 320. The Velcro tape a wraps around from above one fixed tension guide rod 320 to below the lifting tension guide rod 330, and then wraps around to above the other fixed tension guide rod 310. The height sensor 340 is arranged opposite to the lifting tension guide rod 330 and is used to sense the actual height of the lifting tension guide rod 330.

[0060] The controller of the automatic fixed-length hook and loop fastener sewing machine has a preset height. During tension adjustment, the lifting tension guide rod 330 is subjected to both its own weight and the tension of the hook and loop fastener tape a. When the tension of the hook and loop fastener tape a is too high, the lifting tension guide rod 330 will rise under the tension and deviate from the preset height. When the height sensor 340 senses that the actual height of the lifting tension guide rod 330 is greater than the preset height, it sends feedback to the controller. Upon receiving the feedback, the controller controls the tape release device 200 (speed-regulating motor 231) to increase the tape release speed, causing the lifting tension guide rod 330 to descend and return to the preset height. When the tension of the hook and loop fastener tape a is too low... The lifting tensioning guide rod 330 will descend and deviate from the preset height under the action of gravity. When the height sensor 340 senses that the actual height of the lifting tensioning guide rod 330 is less than the preset height, it sends feedback to the controller. After receiving the feedback, the controller controls the tape feeding device 200 (speed regulating motor 231) to reduce the tape feeding speed, so that the lifting tensioning guide rod 330 rises and returns to the preset height, so that the lifting tensioning guide rod 330 is kept at the preset height without rising or falling. The tension of the hook and loop tape a and the weight of the lifting tensioning guide rod 330 are in a balanced state, that is, the tension of the hook and loop tape a is always kept at 1 / 2 of the weight of the lifting tensioning guide rod 330.

[0061] In this embodiment, the height sensor 340 is a laser rangefinder sensor, located above or below the lifting tension guide rod 330, used to measure the actual distance between it and the lifting tension guide rod 330. Since the installation height of the laser rangefinder sensor is known, the actual distance measured by the laser rangefinder sensor can be converted into the actual height of the lifting tension guide rod 330, or the actual distance measured by the laser rangefinder sensor can be directly equated to the actual height of the lifting tension guide rod 330.

[0062] Preferably, the automatic fixed-length sewing machine for Velcro can use a PID controller to control the feeding speed of the tape feeding device 200 (speed-regulating motor 231). Assuming that in the nth detection of the height sensor 340, the actual height of the lifting tensioning guide rod 330 is H(n), and H(n) ≠ H0, where H0 is the preset height, then the feeding speed of the tape feeding device 200 (speed-regulating motor 231) is controlled as V(n) = Kp*[H(n)-H0] + Kd*{[H(n)-H0]-[H(n-1)-H0)]}, where Kp is the proportional coefficient set in the PID controller, and Kd is the derivative coefficient set in the controller.

[0063] The tension detection device 300 also includes several fixed auxiliary guide rods 350, which are horizontally arranged on the tension fixing frame 310 to guide the direction of the hook and loop tape a. The specific number and position of the fixed auxiliary guide rods 350 depend on the feeding position, discharging position and specific direction of the hook and loop tape a on the tension detection device 300, and are not specifically limited.

[0064] like Figure 6 and 7 As shown, the fixed-length cutting device 400 includes a mounting base 410 and a feeding mechanism 420, a cutting mechanism 430, and a clamping mechanism 440 sequentially arranged on the mounting base 410 along the discharge direction of the tension detection device 300.

[0065] The feeding mechanism 420 is used to sequentially feed hook and loop tape of a predetermined length to the cutting mechanism 430 and the clamping mechanism 440. It includes a feeding friction wheel 421, an auxiliary pressure wheel 422, a fixed length driver 423, and a pressure wheel lifter 424. The feeding friction wheel 421 and the auxiliary pressure wheel 422 are arranged vertically opposite each other. The pressure wheel lifter 424 is connected to the pressure wheel lifter 422 and is driven to lift and lower, thereby cooperating with the feeding friction wheel 421 to press or release the hook and loop tape. The feeding friction wheel 421 is connected to the fixed length driver 423 and is driven to rotate, thereby driving the hook and loop tape forward through friction.

[0066] The cutting mechanism 430 is used to cut the Velcro tape fed by the feeding mechanism 420. It includes a cutting table 431, a cutter 432, and a cutting driver 433. The cutting table 431 and the cutter 432 are arranged vertically opposite each other. The cutting table 431 is provided with a cutting groove (not shown in the figure) through which the cutter 432 can pass. The cutter 432 is connected to the cutting driver 433 so that it can move up and down under the drive of the cutting driver 433, thereby cutting the Velcro tape located on the cutting table 431.

[0067] The clamping mechanism 440 is used to clamp the hook and loop tape before it is cut. It includes a fixed clamping plate 441, a movable clamping plate 442, and a clamping driver 443. The fixed clamping plate 441 and the movable clamping plate 442 are arranged vertically opposite each other. The movable clamping plate 442 is connected to the clamping driver 443 so that it can move up and down under the drive of the clamping driver 443, thereby cooperating with the fixed clamping plate 441 to clamp or release the hook and loop tape.

[0068] The fixed-length cutting device 400 of the present invention achieves the fixed-length function of the hook and loop fastener tape by pre-setting the tape feeding length of the tape feeding mechanism 420 (the number of rotations of the tape feeding friction wheel 421) so that the tape feeding mechanism 420 first feeds a piece of hook and loop fastener tape of the same length to the tape cutting mechanism 430 according to the preset tape feeding length each time the tape is cut. The tape feeding mechanism 420 and the tape unloading device 200 are synchronized; that is, when the tape feeding mechanism 420 feeds, the tape unloading device 200 also unloads, and when the tape feeding mechanism 420 stops feeding, the tape unloading device 200 also stops unloading. Furthermore, the feeding speed of the tape feeding mechanism 420 and the unloading speed of the tape unloading device 200 should be synchronized. However, due to component errors and equipment wear, the feeding speed of the feeding mechanism 420 and the unloading speed of the unloading device 200 will actually deviate. If the actual feeding speed of the feeding mechanism 420 is greater than the actual unloading speed of the unloading device 200, the tension of the hook and loop tape will increase. If the actual feeding speed of the feeding mechanism 420 is less than the actual unloading speed of the unloading device 200, the tension of the hook and loop tape will decrease. Both the increase and decrease in tension will cause the hook and loop tape to stretch and contract to varying degrees, thus affecting the length accuracy of the feeding mechanism 420. Therefore, the tension detection device 300 is needed to adjust and maintain the constant tension of the hook and loop tape.

[0069] When the tension of the hook and loop tape is kept constant, the feeding speed of the tape feeding mechanism 420 is constant, while the tape releasing speed of the tape releasing device 200 is adjusted in real time according to the tension of the hook and loop tape.

[0070] During fixed-length cutting, the feeding mechanism 420, through the rotation of the feeding friction wheel 421, uses the frictional force of the feeding friction wheel 421 to drive the hook and loop tape forward, so that the hook and loop tape is sequentially fed into the cutting mechanism 430 and the clamping mechanism 440; then, the fixed clamping plate 441 and the movable clamping plate 442 of the clamping mechanism 440 clamp the hook and loop tape together, and then the cutter 432 of the cutting mechanism 430 cuts the end of the hook and loop tape to be cut. At this time, since the hook and loop tape has been clamped by the clamping mechanism 440 in advance, the hook and loop tape will not retract due to the force of the cutter 432 when it is cut by the cutting mechanism 430, which can ensure that the cutting length of the hook and loop tape will not deviate.

[0071] In this embodiment, the fixed-length driver 423 is a stepper motor, and the pressure roller lifter 424, the tape cutter driver 433, and the tape clamping driver 443 are lifting cylinders.

[0072] like Figure 8 As shown, the fixing clamp 441 includes a first fixing clamping part 441a, a second fixing clamping part 441b, and a first connecting part 441c. The first fixing clamping part 441a extends in the left-right direction, and its left-right width is equal to or greater than the width of the Velcro strip. The second fixing clamping part 441b extends in the front-back direction, and its left-right width is less than the width of the Velcro strip. The second fixing clamping part 441b and the first connecting part 441c are both connected to the first fixing clamping part 441a. The second fixing clamping part 441b is located on the side of the first fixing clamping part 441a away from the material handling and transfer device 500, and is perpendicular to the first fixing clamping part 441a. The fixing clamp 441 is fixedly connected to the mounting base 410 through the first connecting part 441c.

[0073] Similarly, the movable clamping plate 442 includes a first movable clamping part 442a, a second movable clamping part 442b, and a second connecting part 442c. The first movable clamping part 442a extends in the left-right direction, and its left-right width is equal to or greater than the width of the Velcro strip. The second movable clamping part 442b extends in the front-back direction, and its left-right width is less than the width of the Velcro strip. The second movable clamping part 442b and the second connecting part 442c are both connected to the first movable clamping part 442a. The second movable clamping part 442b is located on the side of the first movable clamping part 442a away from the material handling and transfer device 500, and is perpendicular to the first movable clamping part 442a. The movable clamping plate 442 is fixedly connected to the clamping driver 443 through the second connecting part 442c.

[0074] The first movable clamping part 442a and the first fixed clamping part 441a are arranged vertically opposite each other and are used to clamp or release the entire end of the hook and loop tape near the cutting mechanism 430. The second movable clamping part 442b and the second fixed clamping part 441b are arranged vertically opposite each other and are used to clamp or release the side of the hook and loop tape away from the cutting mechanism 430 and away from the material picking and transferring device 500, so that the side of the hook and loop tape away from the cutting mechanism 430 and near the material picking and transferring device 500 can be exposed for the material picking and transferring device 500 to pick up.

[0075] Preferably, the feeding mechanism 420 further includes a material strip sensor 444 located next to the movable clamping plate 442, used to sense whether the hook and loop tape exists between the fixed clamping plate 441 and the movable clamping plate 442. If the material strip sensor 444 senses that the hook and loop tape exists between the fixed clamping plate 441 and the movable clamping plate 442 after the feeding mechanism 420 has fed the hook and loop tape forward a preset length, it indicates that the hook and loop tape has been fed into place. Then, the pressure roller lifter 424 is controlled to drive the movable clamping plate 442 to descend so that the movable clamping plate 442 and the fixed clamping plate 441 clamp the hook and loop tape together. Otherwise, an alarm is triggered.

[0076] like Figure 6 As shown, the material handling and conveying device 500 includes a material handling gripper 510 and a gripper translation mechanism 520. The material handling gripper 510 is disposed on the gripper translation mechanism 520 to translate left and right under the drive of the gripper translation mechanism 520. The material handling gripper 510 includes a clamping part 511 and a connecting part 512. The clamping part 511 extends in the left-right direction, and the connecting part 512 extends in the front-back direction. The clamping part 511 is vertically connected to one end of the connecting part 512, and the other end of the connecting part 512 is provided with an opening cylinder 513 and is fixedly connected to the gripper translation mechanism 520. The connecting part 512 is arranged left-right opposite to the second fixed clamping part 441b and the second movable clamping part 442b, and the clamping part 511 is arranged front-back opposite to the first fixed clamping part 441a and the first movable clamping part 442a.

[0077] like Figure 9 and 10 As shown, the sewing device 600 includes a sewing needle plate 610, a material clamping mechanism 620, a two-dimensional moving mechanism 630, a sewing head 640, and a presser foot mechanism 650. The material clamping mechanism 620, the sewing head 640, and the presser foot mechanism 650 are all located above the sewing needle plate 610. The two-dimensional moving mechanism 630 is connected to the material clamping mechanism 620.

[0078] The clamping mechanism 620 is used to clamp the material above the sewing needle plate 610. It includes a clamping base 621, a hollow base plate 622, a pressure frame 623, a lifting guide rail assembly 624, and a pressure driver 625. The hollow base plate 622 is connected to the lower side of the clamping base 621. The pressure frame 623 is movably connected to the upper side of the clamping base 621 through the lifting guide rail assembly 624. The pressure frame 623 and the hollow base plate 622 are arranged opposite each other vertically. The pressure driver 625 is arranged on the clamping base 621 and drives the pressure frame 623 to move up and down, so that the pressure frame 623 and the hollow base plate 622 cooperate to clamp or release the material.

[0079] The two-dimensional moving mechanism 630 is used to drive the clamping mechanism 620 to move in two dimensions on the sewing plane according to the sewing trajectory;

[0080] The sewing head 640 is used to sew the Velcro tape together with the material, and includes a needle (not shown in the figure).

[0081] The presser foot mechanism 650 is used to press the material located below the needle onto the sewing needle plate 610, and is located below the needle.

[0082] During sewing, the material can be manually fed by a worker between the perforated base plate 622 and the pressure frame 623 of the clamping mechanism 620, or it can be automatically fed by an automatic feeding device. Then, the material pick-up and transfer device 500 delivers the Velcro tape above the material. Next, the pressure driver 625 drives the pressure frame 623 to descend, so that the pressure frame 623 and the perforated base plate 622 clamp the material together. At the same time, the material pick-up and transfer device 500 descends with the pressure frame 623 to press the Velcro tape onto the material. Then, the presser foot mechanism 650 presses the material located below the needle onto the sewing needle plate 610. Then, the needle of the sewing machine head 640 begins to sew the Velcro tape and the material. At the same time, the two-dimensional movement mechanism 630 drives the clamping mechanism 620 to move two-dimensionally on the sewing plane according to the sewing trajectory.

[0083] The hollow base plate 622 has multiple hollow windows, each corresponding to a sewing area on the material, used to avoid the needle of the sewing machine head 640 during sewing.

[0084] In this embodiment, there are two sets of pressure actuators 625, each set consisting of a pressure cylinder and a pressure connecting rod. The pressure cylinder drives the pressure frame 623 to move up and down through the pressure connecting rod.

[0085] Preferably, the material handling and transfer device 500 is disposed on the pressure frame 623 to move synchronously with the pressure frame 623, so that when the pressure frame 623 and the hollow base plate 622 clamp the material together, the material handling and transfer device 500 presses the clamped Velcro strip onto the material.

[0086] Preferably, the fixed-length cutting device 400 is disposed on the clamping seat 621 to move in two dimensions synchronously with the clamping mechanism 620. This ensures that during the process of the clamping mechanism 620 sewing the material with the Velcro tape, the fixed-length cutting device 400 remains in a fixed position relative to the clamping mechanism 620 and the material picking and conveying device 500, thereby reducing control steps and simplifying the design of the control software.

[0087] like Figure 2 As shown, the sewing machine frame 100 includes a fixed upright 110, a movable machine platform 120, and a machine platform translation mechanism 130. The machine platform translation mechanism 130 is mounted on the fixed upright 110, and the movable machine platform 120 is mounted on the machine platform translation mechanism 130. The machine platform translation mechanism 130 is used to drive the movable machine platform 120 to move back and forth relative to the fixed upright 110. The feeding device and tension detection device 300 are mounted on the fixed upright 110, and the fixed-length cutting device 400, the material picking and transferring device 500, and the sewing device 600 are all mounted on the movable machine platform 120.

[0088] The machine tool translation mechanism 130 includes translation guide rails 131, translation sliders 132, and translation driver 133. There are two translation guide rails 131, which are parallel to the front-back direction and arranged side by side on the fixed frame 110 in the left-right direction. There are two sets of translation sliders 132, which are movably arranged on the two translation guide rails 131 respectively. Each set of translation sliders 132 includes at least one translation slider. The mobile machine tool 120 is arranged on the translation sliders 132, and the translation driver 133 is arranged on the fixed frame 110, and its output end is connected to the mobile machine tool 120.

[0089] In this embodiment, the translation driver 133 is a lead screw assembly with a hand crank. The lead screw assembly is driven by manually rotating the hand crank to adjust the position of the fixed-length cutting device 400, the material picking and conveying device 500, and the sewing device 600 relative to the feeding device and the tension detection device 300.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the embodiments of the present invention have been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic fixed-length sewing machine for Velcro, characterized in that, The machine includes a sewing machine frame, a tape feeding device, a tension detection device, a fixed-length cutting device, a material picking and conveying device, and a sewing device. The tape feeding device, tension detection device, fixed-length cutting device, material picking and conveying device, and sewing device are all mounted on the sewing machine frame. The tape feeding device is used to load the hook and loop tape and feed the hook and loop tape out. The tension detection device is used to detect the tension of the hook and loop tape delivered by the tape release device, and then adjust the tape release speed of the tape release device so that the tension of the hook and loop tape remains constant and is located between the tape release device and the fixed-length cutting device. The fixed-length cutting device is used to cut the Velcro tape delivered by the tape feeding device to a fixed length. The material handling and transfer device is used to transfer the Velcro tape cut by the fixed-length cutting device to the sewing device, and is located between the fixed-length cutting device and the sewing device; The sewing device is used to sew the Velcro tape conveyed by the material handling and transfer device together with the material; The fixed-length cutting device includes a mounting base and a feeding mechanism, a cutting mechanism, and a clamping mechanism arranged sequentially on the mounting base along the discharge direction of the tension detection device. The clamping mechanism is used to clamp the hook and loop tape before it is cut. It includes a fixed clamping plate, a movable clamping plate, and a clamping driver. The fixed clamping plate and the movable clamping plate are arranged opposite each other vertically. The movable clamping plate is connected to the clamping driver so that it can move up and down under the drive of the clamping driver, thereby cooperating with the fixed clamping plate to clamp or release the hook and loop tape. The fixing clamp includes a first fixing clamping part, a second fixing clamping part, and a first connecting part. The first fixing clamping part extends in the left-right direction, and its left-right width is equal to or greater than the width of the hook and loop tape. The second fixing clamping part extends in the front-back direction, and its left-right width is less than the width of the hook and loop tape. The second fixing clamping part and the first connecting part are both connected to the end of the first fixing clamping part away from the material handling and transfer device, wherein the second fixing clamping part and the first fixing clamping part are perpendicular to each other. The first connecting part is fixedly connected to the cutting table of the tape cutting mechanism. The movable clamping plate includes a first movable clamping part, a second movable clamping part, and a second connecting part. The first movable clamping part extends in a left-right direction, and its left-right width is equal to or greater than the width of the hook and loop tape. The second movable clamping part extends in a front-back direction, and its left-right width is less than the width of the hook and loop tape. Both the second movable clamping part and the second connecting part are connected to the end of the first movable clamping part away from the material handling and transfer device, wherein the second movable clamping part and the first movable clamping part are perpendicular to each other. The second connecting part is fixedly connected to the clamping drive. The first fixed clamping part and the first movable clamping part are arranged vertically opposite each other to clamp or release the entire end of the hook and loop tape near the cutting mechanism. The second fixed clamping part and the second movable clamping part are arranged vertically opposite each other to clamp or release the side of the hook and loop tape away from the cutting mechanism and away from the material picking and transferring device. The side of the hook and loop tape away from the cutting mechanism and near the material picking and transferring device is exposed for the material picking and transferring device to pick up.

2. The automatic fixed-length sewing machine for Velcro as described in claim 1, characterized in that, The tape feeding device includes a tape feeding reel, a friction wheel mechanism, and a tape feeding drive mechanism. There are two friction wheel mechanisms, each frictionally abutting both ends of the tape feeding reel. The tape feeding drive mechanism is connected to one of the friction wheel mechanisms to drive the tape feeding reel to rotate and feed the tape. The friction wheel mechanism includes a tape feeding fixing plate, a first friction wheel, and a second friction wheel. The tape feeding reel, the first friction wheel, and the second friction wheel are all connected to the same side of the tape feeding fixing plate via corresponding rotating shafts. The rotating shafts of the first and second friction wheels are parallel to the rotating shaft of the tape feeding reel, and the surfaces of the first and second friction wheels rub against the surface of the tape feeding reel.

3. The automatic fixed-length sewing machine for Velcro as described in claim 1, characterized in that, The tension detection device includes a tension fixing frame, a fixed tension guide rod, a lifting tension guide rod, and a height sensor. Both the fixed tension guide rod and the lifting tension guide rod are horizontally mounted on the tension fixing frame. There are two fixed tension guide rods, and the lifting tension guide rod is arranged in a triangle with the two fixed tension guide rods. The Velcro tape wraps around the top of one fixed tension guide rod, then around the bottom of the lifting tension guide rod, and then around the top of the other fixed tension guide rod. The height sensor is positioned opposite the lifting tension guide rod and is used to sense the actual height of the lifting tension guide rod.

4. The automatic fixed-length sewing machine for Velcro as described in claim 3, characterized in that, When adjusting the tension, if the height sensor detects that the actual height of the lifting tension guide rod is greater than the preset height, it sends feedback to the controller. Upon receiving the feedback, the controller controls the tape unloading device to increase the unloading speed, causing the lifting tension guide rod to descend and return to the preset height. If the height sensor detects that the actual height of the lifting tension guide rod is less than the preset height, it sends feedback to the controller. Upon receiving the feedback, the controller controls the tape unloading device to decrease the unloading speed, causing the lifting tension guide rod to rise and return to the preset height, so that the lifting tension guide rod is ultimately kept at the preset height without rising or falling.

5. The automatic fixed-length sewing machine for Velcro as described in claim 1, characterized in that, The feeding mechanism is used to sequentially feed hook and loop tape of a predetermined length to the cutting mechanism and the clamping mechanism. It includes a feeding friction wheel, an auxiliary pressure wheel, a fixed-length driver, and a pressure wheel lifter. The feeding friction wheel and the auxiliary pressure wheel are arranged vertically opposite each other. The auxiliary pressure wheel is connected to the pressure wheel lifter so that it can be raised and lowered under the drive of the pressure wheel lifter, thereby cooperating with the feeding friction wheel to press or release the hook and loop tape. The feeding friction wheel is connected to the fixed-length driver so that it can rotate under the drive of the fixed-length driver, thereby driving the hook and loop tape forward through friction. The cutting mechanism is used to cut the Velcro tape fed by the tape feeding mechanism. It includes a cutting table, a cutter, and a cutting driver. The cutting table and the cutter are arranged vertically opposite each other. The cutting table is provided with a cutting groove for the cutter to pass through. The cutter is connected to the cutting driver and moves up and down under the drive of the cutting driver to cut the Velcro tape located on the cutting table.

6. The automatic fixed-length sewing machine for Velcro as described in claim 1, characterized in that, The material handling and transfer device includes a material handling gripper and a gripper translation mechanism. The material handling gripper is mounted on the gripper translation mechanism to move left and right under the drive of the gripper translation mechanism. The material handling gripper includes a clamping part and a connecting part. The clamping part extends in the left-right direction, and the connecting part extends in the front-back direction. The clamping part is vertically connected to one end of the connecting part, and the other end of the connecting part is provided with an opening cylinder and is fixedly connected to the gripper translation mechanism. The connecting part is arranged left-right opposite to the second fixed clamping part and the second movable clamping part, and the clamping part is arranged front-back opposite to the first fixed clamping part and the first movable clamping part.

7. The automatic fixed-length sewing machine for Velcro as described in claim 1, characterized in that, The sewing device includes a sewing needle plate, a material clamping mechanism, a two-dimensional moving mechanism, a sewing machine head, and a presser foot mechanism. The material clamping mechanism, sewing machine head, and presser foot mechanism are all located above the sewing needle plate, and the two-dimensional moving mechanism is connected to the material clamping mechanism. The clamping mechanism is used to clamp the material above the sewing needle plate. It includes a clamping base, a hollow base plate, a pressure frame, a lifting guide rail assembly, and a pressure driver. The hollow base plate is connected to the lower side of the clamping base. The pressure frame is movably connected to the upper side of the clamping base through the lifting guide rail assembly. The pressure frame and the hollow base plate are arranged opposite each other. The pressure driver is arranged on the clamping base and drives the pressure frame to move up and down, so that the pressure frame and the hollow base plate cooperate to clamp or release the material. The two-dimensional moving mechanism is used to drive the clamping mechanism to move in two dimensions on the sewing plane according to the sewing trajectory; The sewing head, including a needle, is used to sew the Velcro tape together with the material. The presser foot mechanism is used to press the material located below the needle onto the sewing needle plate, and is positioned below the needle.

8. The automatic fixed-length sewing machine for Velcro as described in claim 7, characterized in that, The material handling and conveying device is mounted on the pressure frame, and the fixed-length cutting device is mounted on the clamping seat.

9. The automatic fixed-length sewing machine for Velcro as described in claim 1, characterized in that, The sewing machine frame includes a fixed upright, a movable machine platform, and a machine platform translation mechanism. The machine platform translation mechanism is mounted on the fixed upright, and the movable machine platform is mounted on the machine platform translation mechanism. The machine platform translation mechanism is used to drive the movable machine platform to move back and forth relative to the fixed upright. The tape feeding device and tension detection device are mounted on the fixed upright, and the fixed-length cutting device, the material picking and conveying device, and the sewing device are all mounted on the movable machine platform.

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