A four-edge overlocker

Abstract

The application discloses a four-side binding machine, which comprises a rack, a binding machine arranged on the rack, a rotating mechanism arranged above a sewing table top and used for rotating a cloth piece, a cloth pushing mechanism matched with the rotating mechanism, a passive deviation rectifying mechanism arranged on the right side of a presser foot of the binding machine and used for rectifying the deviation of the cloth piece, an active deviation rectifying mechanism arranged on the front side of the sewing table top and used for moving and rectifying the deviation of the cloth piece, a rear trailing wheel mechanism arranged on the left side of the presser foot of the binding machine and used for moving the cloth piece after the cloth piece is separated from the binding machine, and a self-adapting material collecting device used for automatically collecting the cloth piece after the binding of the cloth piece is completed. The four-side binding machine can be used for sewing square or long strip-shaped thin materials or elastic materials with the length and width of 1m, has the advantages of small occupied area, no mechanical hand, no complex and difficult-to-maintain mechanism such as a visual system, high sewing efficiency, and the like, and one person can operate 3 to 4 machines, thereby greatly improving the production efficiency while reducing the labor intensity.

Description

Technical Field

[0001] This invention relates to the field of sewing device technology, and in particular to a four-sided binding machine. Background Technology

[0002] Existing four-side binding equipment has several drawbacks. First, it is designed for binding the edges of thick, low-elasticity fabrics such as towels, dishcloths, and carpets; however, it cannot bind the edges of thin, elastic fabrics, such as the rotary floor mop binding machine from Qiongpai Ruit. Second, equipment for binding the edges of fabric pieces approximately 1 meter in size often involves large machines, vision systems, four-axis robots, and various pressing templates that need to be changed according to the size of the fabric piece. This equipment is space-consuming and expensive, as exemplified by Luoshi Robotics' four-side binding workstation and rotary floor mop binding machine. Chinese patent document CN112210902A, published on January 12, 2021, discloses a rotating handkerchief machine, including a frame with a carrying space on the frame; a processing table set within the carrying space; an overlock machine located on one side of the processing table, with a smoothing component at its front end for smoothing and positioning the fabric; a label feeding mechanism located on one side of the overlock machine for feeding labels into the overlock machine; a fabric spinning mechanism located above the processing table for multi-sided rotation of the fabric on the processing table; a receiving component located on one side of the processing table for collecting finished products; and a conveying component located above the processing table for assisting the overlock machine in overlock processing and for conveying the fabric on the processing table forward to the receiving component. This structure can automatically overlock the four sides of the fabric and sew the labels, and can automatically collect the finished products. However, this rotary handkerchief machine is only suitable for edge binding of handkerchiefs, with a limited range of applications. In addition, the equipment has a complex structure, occupies a large area, and has high costs. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of existing four-side binding machines having a limited range of applications, requiring the replacement of pressing templates according to the size of the fabric, and having a large footprint and high cost. The invention provides a four-side binding machine that can sew square or long strips of thin or elastic fabrics such as jacquard fabric, technical fabric, denim, cotton and linen fabrics within a 1-meter length and width range. It has the advantages of simple structure, small footprint, low cost and high sewing efficiency.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is a four-sided overlock machine, including a frame and an overlock sewing machine mounted on the frame. The upper surface of the frame is provided with a sewing table, including:

[0005] A rotating mechanism, used for rotating the fabric piece, is located above the sewing table and includes a rotating arm and a pressing component disposed under the rotating arm. The rotating mechanism is used to rotate the fabric piece that has been sewn on one side by 90 degrees in order to perform the hemming of the next side. In this invention, the rotating arm rotates, causing the pressing component under the rotating arm to rotate by 90 degrees, thereby rotating the fabric piece by 90 degrees to complete the rotation of the fabric piece.

[0006] A passive correction mechanism, used for auxiliary fabric correction, is located on the right side of the presser foot of the overlock sewing machine on the sewing table. It includes a movable small correction wheel assembly and a large correction wheel assembly arranged sequentially along the fabric feeding direction of the overlock sewing machine. The passive correction mechanism is located on the sewing side of the fabric and is used to assist in correcting fabric deviation. The small correction wheel assembly enables the small correction wheel to move up and down, while the large correction wheel assembly enables the large correction wheel to move up and down and forward and backward. During normal operation, the small and large correction wheels are in the raised state and do not contact the fabric. When the fabric shifts towards the front of the sewing table, the small and large correction wheels are lowered to hold the fabric in place. The fabric drives the small and large correction wheels to rotate. Since the radial plane of the small correction wheel points obliquely backward towards the presser foot, and the radial plane of the large correction wheel points towards the presser foot of the overlock sewing machine, the fabric shifts towards the rear of the sewing table during movement, thus achieving the correction purpose. Passive correction here refers to the passive rotation of small and large correction wheels to cause the fabric to shift, thereby achieving the purpose of correcting the fabric's deviation.

[0007] An active correction mechanism, used for moving and correcting the fabric, is located on the sewing table in front of the presser foot of the overlock machine. It includes a fabric guide belt that contacts and moves the fabric. During normal operation, this mechanism moves the fabric in sync with the speed of the overlock machine, ensuring equal speeds on both the front and back sides to maintain fabric flatness and prevent accumulation. When the fabric shifts towards the rear of the sewing table, the speed of the fabric guide belt is increased, making the front speed greater than the rear speed, causing the fabric to shift towards the front of the sewing table, thus correcting the deviation. Conversely, when the passive correction mechanism is active, the fabric guide belt reduces the front speed of the fabric, quickly correcting the deviation. In essence, active correction refers to actively adjusting the fabric's movement speed by accelerating or decelerating it with the fabric guide belt, thereby correcting any deviations.

[0008] The rear roller mechanism, used to stabilize the posture of the fabric at the end of sewing and the movement of the fabric after it leaves the overlock sewing machine, is located on the left side of the presser foot of the overlock sewing machine on the sewing table. It includes a rear roller motor and a synchronous belt for pulling the fabric driven by the rear roller motor. The main functions of the rear roller mechanism are: first, to press down when the fabric is about to leave the presser foot of the overlock sewing machine, driving the rear roller motor to move the fabric forward, stabilizing the posture of the fabric at the end of sewing and enabling smooth thread cutting; second, after the fabric has finished sewing one side and the thread has been cut, to reverse the rear roller motor to adjust the initial rotation position of the fabric and complete the subsequent rotation.

[0009] The adaptive take-up device, used for the automatic collection of fabric pieces after sewing, is located on the left side of the overlock machine on the sewing table. It includes a take-up moving mechanism, a fabric pressing mechanism, a fabric dropping mechanism, and a take-up wheel mechanism. Located on the fabric exit side, the adaptive take-up device collects the finished fabric pieces. The take-up moving mechanism controls the entire movement of the adaptive take-up device. When the first three edges of the fabric are being hemmed, the adaptive take-up device moves away from the sewing table to avoid interfering with the rotation of the fabric. When the last edge is being sewn, the adaptive take-up device moves closer to the sewing table so that the finished fabric piece can smoothly enter the adaptive take-up device. The fabric pressing mechanism, fabric dropping mechanism, and take-up wheel mechanism are used for collecting and organizing the fabric pieces.

[0010] This invention can sew thin or elastic fabrics such as jacquard fabric, technical fabric, denim, cotton linen, etc., in square or rectangular shapes within a 1-meter length and width range. The four-side binding machine of this invention has a small footprint, eliminates the need for complex and difficult-to-maintain mechanisms such as robotic arms and vision systems, and boasts high sewing efficiency, with a machine speed reaching 5000 rpm. It is also easy to operate; the presser foot automatically lifts when the fabric is placed under it, and the machine can be started simply by placing the fabric correctly under the presser foot. This effectively reduces the need for specialized skills, allowing one person to operate 3 to 4 machines, significantly increasing production efficiency while reducing labor intensity.

[0011] Preferably, a fixing frame is provided on the sewing table, the fixing frame is located on the left side of the overlock sewing machine, and a central fixing plate is horizontally installed on the top of the fixing frame.

[0012] Preferably, the frame is equipped with a pair of parallel linear guide rails, each with a linear slider. A headstock mounting plate is mounted on the linear slider. The overlock sewing machine is mounted on the headstock mounting plate. A stop bolt is fixed to the front of the frame of the overlock sewing machine, and a handle-type indexing pin is located at the rear of the headstock mounting plate. The headstock mounting plate is used to mount the overlock sewing machine, while the stop bolt and handle-type indexing pin are used for front and rear positioning of the machine. The headstock mounting plate can slide on the guide rails. During maintenance, repair, threading, and other operations, the handle-type indexing pin can be moved first, and then the overlock sewing machine can be pulled out for operation through the handle groove on the headstock mounting plate.

[0013] Preferably, the four-sided overlock machine also includes a fabric-feeding mechanism, which is mounted on the frame below the right side of the sewing table. The mechanism includes a fabric-feeding cylinder and a fabric-feeding rod connected to the cylinder. The upper end of the fabric-feeding rod has a horizontal bar, which is horizontally positioned and perpendicular to the direction of fabric movement of the four-sided overlock machine. The fabric-feeding cylinder drives the fabric-feeding rod to approach or move away from the sewing table. When the movable rod of the fabric-feeding cylinder retracts, the horizontal bar approaches the sewing table, and its height is approximately equal to the height of the sewing table. When the movable rod of the fabric-feeding cylinder extends, the horizontal bar swings away from the sewing table. When the fabric piece is long, the rotating mechanism alone cannot fully rotate the fabric piece under the sewing table. In this case, the fabric-pulling cylinder on the fabric-pulling mechanism pushes the fabric-pulling rod to move away from the sewing table. The horizontal bar at the upper end of the fabric-pulling rod supports the fabric piece below and extends it outwards, thus straightening and moving the longer fabric piece hanging on the right side of the sewing table to a position suitable for sewing, achieving the goal of smoothly rotating the fabric piece. This invention's fabric-pulling mechanism and rotating mechanism work together to rotate not only large fabric pieces but also narrow, long strips of fabric, such as 40mm*1500mm.

[0014] Preferably, the rear end of the rotating arm is hinged to a horizontally positioned axis fixing plate at the top of the fixed frame via a hinge pin. The middle end of the rotating arm is connected to the drive rod of a rotating cylinder via a connecting rod. A pressing component is provided at the front end of the rotating arm, and a branch arm is connected to the side of the middle end of the rotating arm. A pressing component is provided at the other end of the branch arm. The pressing component includes upper and lower pressing cylinders and a pressing block fixed to the extended end of the upper and lower pressing cylinders. The pressing block under the rotating arm is perpendicular to the pressing block under the branch arm. Two long strip-shaped pressing blocks arranged at right angles are used, and the pressing range of the pressing blocks is fan-shaped. This not only allows for pressing large fabric pieces (i.e., both pressing blocks press the fabric piece), but also for pressing narrow, long strips of fabric (pressed by one pressing block, for example, a 40mm*1500mm fabric piece). This expands the applicability of the four-sided binding machine, giving it a wider range of applications.

[0015] Preferably, a right-angle stop block is provided on the outer side of the hinge joint between the shaft fixing plate and the rotating arm. The right-angle stop block is fixed on the shaft fixing plate, and a hydraulic damper is provided on each of the two right-angle sides of the right-angle stop block. The right-angle stop block is used to limit the extreme rotation position of the rotating arm, and the hydraulic damper is used to counteract the impact force that may be generated when the rotating arm rotates.

[0016] Preferably, a small sewing table is provided on the sewing table near the overlock machine. A small correction wheel assembly is positioned above the small sewing table near the right side of the presser foot of the overlock machine. The small correction wheel assembly is driven by a small wheel lifting cylinder to move the small correction wheel up and down. A small fabric guard plate and a fabric sensor for detecting fabric pieces are also provided on the small sewing table. A large correction wheel assembly is positioned above the sewing table to the right of the small correction wheel assembly. The large correction wheel assembly is driven by a large wheel lifting cylinder to move the large correction wheel up and down. The large wheel lifting cylinder is driven by a large wheel telescopic cylinder to move the large correction wheel forward and backward. The large wheel telescopic cylinder is fixed to the sewing table. A large fabric guard plate is provided on the rear side of the large correction wheel. The small wheel lifting cylinder is used for raising and lowering the small correction wheel, and the large wheel lifting cylinder is used for raising and lowering the large correction wheel. The fabric sensor is used to detect the position of the fabric pieces. When the fabric pieces shift backward or forward, the control system of the overlock machine adjusts and corrects the movement of the fabric pieces in a timely manner. The large wheel telescopic cylinders are used to retract the large correction wheel when it is raised, in order to avoid the rotation of the rotating swing arm. This invention provides large and small baffle plates on the side of the fabric that needs to be edged. The function of the large and small baffle plates is to limit and guide the position of the fabric, ensuring that the rear edge of the fabric is in a suitable position under normal working conditions, and preventing excessive rearward deviation of the fabric.

[0017] Preferably, the shaft fixing plate has two forward-extending parallel connecting arms. The front ends of the two connecting arms pass through a fixing plate and are rotatably connected to parallel swing arms. The two swing arms are respectively connected to one end of the synchronous pulley lifting cylinder. A transmission synchronous belt assembly is provided at both ends of one swing arm. The upper end of the transmission synchronous belt assembly is connected to the fabric transfer drive motor, and the lower end is connected to the fabric transfer synchronous belt through a rotating shaft and a synchronous pulley. The lower ends of the two swing arms are hinged to both ends of the synchronous pulley fixing plate. The synchronous pulley and the fabric transfer synchronous belt are set on the synchronous pulley fixing plate. The two parallel swing arms facilitate the setting of the fabric transfer synchronous belt at the lower end of the swing arms. At the same time, when the swing arms swing, the fabric transfer synchronous belt is always parallel to the sewing table surface, ensuring the contact area between the fabric transfer synchronous belt and the fabric, and ensuring the horizontal setting of the fabric transfer synchronous belt to prevent the fabric transfer synchronous belt from sliding relative to the fabric.

[0018] Preferably, the rear wheel mechanism includes a power mechanism that drives the mop timing belt to rotate and a lifting mechanism that drives the mop timing belt up and down. The lifting mechanism includes a rear wheel cylinder, one end of which is hinged to a fixed frame, and the other end is hinged to one end of a long strip-shaped rear wheel connecting plate. The other end of the rear wheel connecting plate is connected to a mop timing belt connecting plate, which has a mop timing belt. The power mechanism includes a rear wheel motor, which is fixed to the lower part of the fixed frame. The output shaft of the rear wheel motor is connected to the middle of the rear wheel connecting plate, and the output shaft of the rear wheel motor and the other end of the rear wheel connecting plate have a mop timing belt. This structure facilitates the adjustment of the starting and lowering of the mop timing belt.

[0019] Preferably, the adaptive receiving device is located at the bottom left side of the frame. Two parallel moving guide rails are fixed to the frame, and moving sliders are mounted on the guide rails. The adaptive receiving device is mounted on the moving sliders. A rack is fixed to one side of each guide rail, and a moving drive motor is mounted on the guide rail. The moving drive motor, connected to the rack via gears, drives the adaptive receiving device to move left and right. The frame also has a receiving limit sensor to limit the extreme movement position of the adaptive receiving device. The moving drive motor, connected to the rack via gears, causes the gears to roll on the rack when the motor rotates, thus moving the entire adaptive receiving device along the guide rails. The receiving limit sensor limits the extreme movement position of the adaptive receiving device.

[0020] Preferably, the receiving and moving mechanism is provided with several longitudinal receiving frames and two transverse receiving frames. The transverse receiving frames are located above the longitudinal receiving frames and are perpendicular to the direction of fabric movement. The transverse receiving frame on the left side is provided with a receiving rod for collecting fabric, and the transverse receiving frame on the right side is provided with a receiving plate. The fabric pressing mechanism is located on the left side of the receiving rod, the fabric dropping mechanism is located on the right side of the receiving rod, and the receiving wheel mechanism is located on the right side of the right transverse receiving frame. The receiving roller in the receiving wheel mechanism is located above the receiving plate.

[0021] The beneficial effects of this invention are that it effectively solves the problems of existing four-side binding machines having a limited range of applications, requiring the replacement of pressing templates according to the size of the fabric, and having a large footprint and high cost. The four-side binding machine of this invention can sew square or long strip-shaped thin or elastic fabrics such as jacquard fabric, technical fabric, denim, cotton and linen fabrics within a size of 1 meter in length and width. It has the advantages of simple structure, small footprint, low cost and high sewing efficiency, which greatly improves the applicability of the four-side binding machine and has high practical value. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the four-sided edge-sealing machine of the present invention;

[0023] Figure 2 This is a schematic diagram of an installation structure for the overlock sewing machine of the present invention;

[0024] Figure 3 This is a three-dimensional structural diagram of the rear tug wheel mechanism of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the correction mechanism of the present invention;

[0026] Figure 5 This is a three-dimensional structural diagram of the rotating mechanism and the cloth-pulling mechanism of the present invention;

[0027] Figure 6This is a three-dimensional structural diagram of the adaptive material receiving device of the present invention.

[0028] In the picture:

[0029] 1. Overlock sewing machine; 11. Adjustable block with buffer pad; 12. Machine head fixing plate; 13. Handle-type indexing pin; 14. Handle groove; 15. Linear slider; 16. Linear guide rail; 17. Stop bolt.

[0030] 2. Rotating mechanism; 20. Shaft fixing plate; 21. Right-angle side block; 22. Hydraulic buffer; 23. Hinge pin; 24. Rotating swing arm; 241. Connecting rod; 242. Branch arm; 25. Fabric pressing cylinder; 26. Fabric pressing block; 27. Air float head; 28. Fixing frame; 29. ​​Rotating cylinder.

[0031] 3. Passive correction mechanism; 30. Small wheel connecting plate; 31. Cylinder connecting bracket; 32. Large wheel front and rear telescopic cylinder; 33. Large wheel lifting cylinder; 34. Large baffle plate; 35. Large wheel connecting arm; 36. Large correction wheel; 37. Small wheel connecting arm; 38. Small correction wheel; 39. Small baffle plate; 40. Fabric sensor; 41. Small wheel lifting cylinder; 42. Large wheel connecting plate.

[0032] 4. Electrical cabinet,

[0033] 5. Sewing table, 51. Small sewing table,

[0034] 6. Fabric feeding mechanism; 60. Fabric feeding rod; 61. Bearing housing; 62. Fabric feeding cylinder; 63. Fabric feeding cylinder connecting plate.

[0035] 7. Rack,

[0036] 8. Active correction mechanism; 80. Fabric transfer timing belt; 81. Rotary shaft; 82. Timing pulley fixing plate; 83. Swing arm; 84. Timing pulley lifting cylinder; 85. Transmission timing belt; 86. Fabric transfer drive motor; 87. Connecting arm.

[0037] 9. Rear tow wheel mechanism; 90. Rear tow wheel motor; 91. Motor fixing block; 92. Mop timing belt connecting plate; 93. Mop timing belt adjusting plate; 94. Mop timing belt; 95. Long cloth strip; 96. Adjusting block; 97. Tow wheel timing belt; 98. Rear tow wheel limit block; 99. Rear tow wheel connecting plate; 910. Rear tow wheel cylinder; 911. Cylinder fixing block.

[0038] 10. Adaptive receiving device,

[0039] 200. Material receiving and moving mechanism; 210. Moving guide rail; 220. Moving slider; 230. Moving drive motor; 240. Longitudinal material receiving rack; 250. Rack and pinion; 270. Material receiving limit sensor.

[0040] 300. Fabric pressing mechanism; 310. Telescopic drive cylinder; 320. Telescopic guide rail; 330. Telescopic slider; 340. Fabric pressing drive cylinder; 360. Fabric pressing plate; 370. Take-up rod.

[0041] 400. Fabric dropping mechanism; 410. Paddle drive cylinder; 420. Paddle lever; 440. Slanted baffle.

[0042] 500. Receiving wheel mechanism, 530. Receiving roller, 540. Receiving plate. Detailed Implementation

[0043] The specific implementation of the technical solution of the present invention will be further described below through examples and in conjunction with the accompanying drawings.

[0044] Example 1

[0045] In such Figure 1 Figure 2 In the illustrated embodiment 1, a four-sided overlock machine includes a frame 7 and an overlock sewing machine 1 mounted on the frame 7. The frame has a pair of parallel linear slide rails 16, each with a linear slider 15. A head fixing plate 12 is mounted on each linear slider 15. The overlock sewing machine 1 is mounted on the head fixing plate 12 via four adjustable blocks 11 with buffer pads. A stop bolt 17 is fixed to the front of the frame of the overlock sewing machine 1. A handle-type indexing pin 13 and a handle groove 14 are located at the rear of the head fixing plate 12. The upper surface of the frame 7 has a sewing table 5 with an arc-shaped front side. An air float head 27 is mounted on the left side of the sewing table. An electrical cabinet 4 is located below the sewing table. A fixing frame 28 is mounted on the sewing table, positioned to the left of the overlock sewing machine 1. A central fixing plate 20 is horizontally mounted on the top of the fixing frame 28. The machine also includes:

[0046] Rotating mechanism 2 (see) Figure 5A rotating mechanism for rotating fabric pieces is located above the sewing table 5 and includes a rotating arm 24 and a pressing component below the rotating arm 24. The rear end of the rotating arm 24 is hinged to the axis fixing plate 20 via a hinge pin 23. The middle end of the rotating arm 24 is connected to the drive rod of a rotating cylinder 29 via a connecting rod 241. A pressing component is located at the front end of the rotating arm 24. A branch arm 242 is connected to the side of the middle end of the rotating arm 24, and a pressing component is located at the other end of the branch arm 242. The pressing component includes a pressing cylinder 25 and a pressing block 26 fixed to the extended end of the pressing cylinder 25. The pressing block under the rotating arm 24 is perpendicular to the pressing block under the branch arm. The rotating mechanism is used to rotate the fabric piece that has been sewn on one side by 90 degrees to allow sewing on the next side. This invention rotates the fabric piece by 90 degrees by rotating the rotating arm, which in turn rotates the pressing component under the rotating arm by 90 degrees. By using two long, rectangular pressing blocks arranged at right angles, with the pressing area of ​​each block forming a fan shape, it is possible to press down not only large pieces of fabric (i.e., both pressing blocks press down on the fabric) but also narrow, long strips of fabric (see [reference]). Figure 3 For example, it can hold down a 40mm*1500mm fabric piece. In this case, one of the pressing blocks is used to hold down the fabric piece, which expands the applicability of the four-sided binding machine and gives it a wider range of applications. A right-angle stop block 21 is provided on the outer side of the hinge between the shaft fixing plate 20 and the rotating swing arm 24. The right-angle stop block is fixed to the shaft fixing plate, and a hydraulic buffer 22 is provided on each of the two right-angle sides of the right-angle stop block. The right-angle stop block is used to limit the extreme rotation position of the rotating swing arm, and the hydraulic buffer is used to counteract the impact force that may be generated when the rotating swing arm rotates.

[0047] Passive correction mechanism 3 (see Figure 4This is an auxiliary correction mechanism for fabric pieces, located on the right side of the presser foot of the overlock machine 1 on the sewing table 5. It includes a movable small correction wheel assembly and a large correction wheel assembly arranged sequentially along the fabric feeding direction of the overlock machine 1. A small sewing table 51 is provided near the sewing table 1. The small correction wheel assembly is positioned above the small sewing table 51 near the right side of the presser foot of the overlock machine 1. The small correction wheel assembly drives the small correction wheel 38 to move up and down via a small wheel lifting cylinder 41. The small correction wheel 38 and the small wheel lifting cylinder 41 are connected by a small wheel connecting arm 37, a small wheel connecting plate 30, and a cylinder connecting bracket 31. The small sewing table 51 also has a small fabric baffle 39 and a fabric sensor 40 for detecting fabric pieces. The large correction wheel assembly is located on... Above the sewing table 5 on the right side of the small correction wheel assembly, the large correction wheel assembly drives the large correction wheel 36 to move up and down via a large wheel lifting cylinder 33. The large correction wheel 36 and the large wheel lifting cylinder 33 are connected by a large wheel connecting arm 35 and a large wheel connecting plate 42. The large wheel lifting cylinder 33 drives the large correction wheel 36 to move back and forth via a large wheel telescopic cylinder 32. The large wheel telescopic cylinder 32 is fixed on the sewing table 5. A large fabric baffle 34 is provided on the rear side of the large correction wheel 36. The passive correction mechanism is set on the sewing side of the fabric piece and is used to assist in correction when the fabric piece deviates. The small correction wheel assembly can realize the up and down movement of the small correction wheel, and the large correction wheel assembly can realize the up and down and back and forth movement of the large correction wheel. During normal operation, the small correction wheel 38 and the large correction wheel 36 are in the raised state and do not contact the fabric piece. When the fabric shifts towards the front of the sewing table, the small corrective roller 38 and the large corrective roller 36 are lowered to hold the fabric in place. The fabric then drives the small corrective roller 38 and the large corrective roller 36 to rotate. Since the radial plane of the small corrective roller 38 points obliquely backward toward the presser foot, and the radial plane of the large corrective roller 36 both point toward the presser foot of the overlock machine, the fabric shifts towards the rear of the sewing table during its movement, thus achieving the purpose of correction. The fabric sensor 40 is used to detect the position of the fabric. When the fabric shifts backward or forward, the control system of the overlock machine adjusts the movement of the fabric in a timely manner to correct the shift. The large roller telescopic cylinder 32 is used to retract the large corrective roller when it is raised to avoid the rotation of the rotating arm. The large and small fabric baffles limit and guide the position of the fabric, ensuring that the rear edge of the fabric is in the correct position under normal working conditions and preventing excessive backward shift of the fabric.

[0048] Active correction mechanism 8 (see Figure 4The device is used for moving and correcting the fabric piece. It is located on the front side of the presser foot of the overlock sewing machine 1 on the sewing table 5. It includes a fabric transfer timing belt 80 that can contact the fabric piece and drive it to move. The axis fixing plate 20 is provided with two forward parallel connecting arms 87. The front ends of the two connecting arms 87 pass through a fixing plate and are rotatably connected to mutually parallel swing arms 83. The two swing arms 83 are respectively connected to one end of the synchronous wheel lifting cylinder 84. The swing arms 83 are provided with transmission timing belt assemblies 85 at both ends. The upper end of the transmission timing belt assembly 85 is connected to the fabric transfer drive motor 86, and the lower end is connected to the fabric transfer timing belt 80 through the rotating shaft 81 and the synchronous wheel. The lower ends of the two swing arms 83 are hinged to both ends of the synchronous wheel fixing plate 82. The synchronous wheel and the fabric transfer timing belt are set on the synchronous wheel fixing plate. The active correction mechanism is used for the movement and correction of the fabric piece. During normal operation, it moves the fabric piece in coordination with the moving speed of the overlock sewing machine 1, ensuring that the front and rear sides of the fabric piece move at equal speeds, thus ensuring the fabric piece is flat and preventing accumulation. When the fabric piece shifts towards the rear of the sewing table, the speed of the fabric transfer timing belt 80 is increased, making the front side of the fabric piece move faster than the rear side, causing the fabric piece to shift towards the front of the sewing table 5 during movement, thereby achieving the correction purpose. This invention features two parallel swing arms 83. The lower end of the swing arms 83 facilitates the placement of the fabric transfer timing belt 80. Simultaneously, when the swing arms 83 swing, the fabric transfer timing belt 80 remains parallel to the sewing table 5, ensuring sufficient contact area between the timing belt 80 and the fabric piece, and guaranteeing the horizontal placement of the timing belt 80 to prevent slippage relative to the fabric piece. Furthermore, when the passive correction mechanism is in operation, the timing belt 80 reduces the speed of the front side of the fabric piece, thereby enabling rapid correction of the fabric piece's deviation.

[0049] Rear tug mechanism 9 (see Figure 3This mechanism, used to stabilize the fabric piece's posture at the end of sewing and its movement after detaching from the overlock sewing machine 1, is located on the left side of the presser foot of the overlock sewing machine 1 on the sewing table 5. It includes a rear roller motor 90 and a cloth-pulling timing belt 94 driven by the rear roller motor. The rear roller motor 90 is mounted on the lower part of the fixed frame 28 via a motor fixing block 91. The rear roller mechanism includes a power mechanism that drives the cloth-pulling timing belt 94 to rotate and a lifting mechanism that drives the cloth-pulling timing belt 94 up and down. The lifting mechanism includes a rear roller cylinder 910, one end of which is hinged to the fixed frame 28 via a cylinder fixing block 911. One end is hinged to one end of a long strip-shaped rear drag wheel connecting plate 99. The other end of the rear drag wheel connecting plate 99 is connected to a mop timing belt connecting plate 92 via an adjusting block 96. The mop timing belt connecting plate 92 is equipped with a mop timing belt 94. The other end of the mop timing belt connecting plate 92 is equipped with a mop timing belt adjusting plate 93 for adjusting the tension of the mop timing belt 94. The power mechanism includes a rear drag wheel motor 90, which is fixed to the lower part of the fixed frame 28. A rear drag wheel limiting block 98 is inclinedly arranged on the fixed frame 28 to limit the rising height of the rear drag wheel mechanism and prevent collision with the overlock sewing machine 1. The output shaft of the rear drag wheel motor 90 is connected to the middle of the rear drag wheel connecting plate 99. The output shaft of the rear drag wheel motor 90 and the other end of the rear drag wheel connecting plate are equipped with a drag wheel timing belt 97. The function of the rear roller mechanism is twofold: first, to press down when the fabric is about to leave the presser foot of the overlock sewing machine, driving the rear roller motor 90 to move the fabric forward, stabilizing the fabric's posture at the end of the sewing and enabling smooth thread cutting; second, to reverse the rear roller motor 90 after the fabric has finished sewing one side and the thread has been cut, adjusting the initial rotation position of the fabric to complete the subsequent rotation.

[0050] The four-sided binding machine is also equipped with a fabric feeding mechanism 6 (see...) Figure 5The fabric-feeding mechanism 6 is located on the frame below the right side of the sewing table 5. It includes a fabric-feeding cylinder 62 and a fabric-feeding rod 60 connected to the fabric-feeding cylinder. The upper end of the fabric-feeding rod 60 is provided with a horizontal bar, which is horizontally positioned and perpendicular to the fabric movement direction of the four-sided binding machine. The lower end of the fabric-feeding rod 60 is provided with a horizontal shaft, which is parallel to the horizontal bar. Both ends of the horizontal shaft are fixed to the frame through bearing seats 61. A fabric-feeding cylinder connecting plate 63 is provided on the frame to the left of the horizontal shaft. The fabric-feeding cylinder 62 is hinged to the fabric-feeding cylinder connecting plate 63. The movable rod of the fabric-feeding cylinder 62 is hinged to the lower part of the vertical rod. The fabric-feeding cylinder 62 drives the fabric-feeding rod 60 to approach or move away from the sewing table 5. When the fabric piece is long, the rotating mechanism alone cannot rotate the fabric piece under the sewing table. In this case, the fabric-pulling cylinder on the fabric-pulling mechanism pushes the fabric-pulling rod to move away from the sewing table. The horizontal bar at the upper end of the fabric-pulling rod supports the fabric piece below and extends it outwards, thus straightening and moving the long fabric piece hanging on the right side of the sewing table to a position suitable for sewing, achieving the goal of smoothly rotating the fabric piece. This invention's fabric-pulling mechanism and rotating mechanism work together to rotate not only large fabric pieces but also narrow, long strips of fabric, such as 40mm*1500mm.

[0051] Adaptive receiving device 10 (see Figure 6 The automatic collection mechanism for fabric pieces after sewing is installed on the left side of the overlock machine 1 on the sewing table 5. It includes a take-up moving mechanism 200, a fabric pressing mechanism 300, a fabric dropping mechanism 400, and a take-up wheel mechanism 500. An adaptive take-up device 10 is located at the bottom left side of the frame 7. Two parallel moving guide rails 210 are fixed on the frame 7. A moving slider 220 is mounted on each moving guide rail 210. The adaptive take-up device 10 is mounted on the moving slider 220. A rack 250 is fixed to one side of each moving guide rail 210. A moving drive motor 230 is mounted on each moving guide rail 210. The moving drive motor 230 is connected to the rack 250 via gears, driving the adaptive take-up device 10 to move left and right. A take-up limit sensor 270 is also provided on the frame 7 to limit the extreme movement position of the adaptive take-up device 10.

[0052] The material receiving and moving mechanism is provided with several longitudinal material receiving racks 240 and two transverse material receiving racks. The transverse material receiving racks are located above the longitudinal material receiving racks 240 and are perpendicular to the direction of movement of the fabric pieces. The transverse material receiving rack on the left side is provided with a material receiving rod 370 for collecting fabric pieces, and the transverse material receiving rack on the right side is provided with a material receiving plate 540. A fabric pressing mechanism 300 is located on the left side of the take-up rod 370. The fabric pressing mechanism 300 includes a fabric pressing plate telescopic mechanism, a fabric pressing drive cylinder 340, and a fabric pressing plate 360 ​​connected to the fabric pressing drive cylinder 340. The fabric pressing plate is rectangular. The fabric pressing plate telescopic mechanism includes a telescopic drive cylinder 310, which is fixed to the rear end of the take-up rod 370. The take-up rod 370 is provided with a telescopic guide rail 320, and the telescopic guide rail 320 is provided with a telescopic slider 330 connected to the telescopic drive cylinder 310. A mounting plate is fixed to the telescopic slider 330, and the fabric pressing drive cylinder 340 is fixed to the mounting plate. A fabric dropping mechanism 400 is located on the right side of the take-up rod 370, including a pry bar 420 for prying off the fabric piece and an inclined baffle 440 for guiding the movement of the fabric piece. The pry bar is connected to the pry drive cylinder 410. The receiving wheel mechanism 500 is located on the right side of the right transverse receiving frame, and the receiving roller 530 in the receiving wheel mechanism 500 is located above the receiving plate 540.

[0053] When the four-sided binding machine of this invention is working, if the object being processed is a large square piece of fabric, the fabric is laid flat on the sewing table, and the side to be sewn is placed under the presser foot of the binding machine. Then, pressing the start button or stepping on the foot pedal will begin the automated four-sided binding process. After the binding machine starts, the large and small correction wheels of the passive correction mechanism and the fabric-moving synchronous belt of the active correction mechanism will press down, all three contacting the fabric. The fabric-moving synchronous belt of the rear drag wheel mechanism does not press down but rotates clockwise along the direction of fabric movement. The binding machine is then controlled to sew at a low to medium speed for approximately 26 mm, and then the machine is controlled to trim the thread ends. After trimming the thread ends, the fabric sensor checks for fabric misalignment. If no misalignment is detected, the large and small correction rollers are raised, and the overlock sewing machine's speed and the fabric transfer drive motor's speed are increased to normal sewing speed. If the fabric sensor doesn't detect any fabric, it indicates misalignment. In this case, the overlock sewing machine's speed is increased to normal sewing speed, while the fabric transfer drive motor remains at a low speed, using the speed difference to quickly correct the misalignment. During subsequent sewing, if the fabric misalignment is corrected, the overlock sewing machine's speed and the fabric transfer drive motor's speed are maintained at normal sewing speed, and the large and small correction rollers are raised. If the fabric deviates during sewing, the large and small correction rollers are lowered, and the fabric transfer drive motor's speed is reduced to a low speed. Once one side of the fabric is sewn, the overlock sewing machine's speed and the fabric transfer drive motor's speed are reduced to 0, and the fabric guide belt is lowered to match the slow sewing speed at the end of the fabric. After the machine comes to a complete stop, the overlock sewing machine is controlled to trim the fabric threads. Then, the reverse transfer drive motor and the pull wheel motor are used to adjust the fabric to the starting position of rotation. After that, the presser block is pressed down, and the rotary cylinder drives the rotary swing arm to complete a right-angle rotation. Then the fabric returns to the sewing position, and the above process is repeated to perform the overlock sewing. After repeating this process four times, the overlock sewing of the fabric is completed. Finally, the adaptive take-up device is driven to take up the fabric.

[0054] When the object is a narrow strip of fabric 95 (see Figure 3 When sewing the narrow edge first, the fabric shifting synchronous belt presses down to cooperate with the sewing. Its correction principle is the same as above. When turning the edge, it is only necessary for one of the pressing blocks to press the fabric piece to rotate. When sewing the long edge, the active correction mechanism does not contact the fabric piece, so it does not move. The other actions are the same as above.

[0055] The four-sided edge-sealing machine of the present invention has the following characteristics:

[0056] First, the cooperation between the active and passive correction mechanisms enables rapid, multi-point active and passive correction. Furthermore, fabric sensors detect the current offset of the fabric, ensuring that good stitches can be produced on fabrics of various thicknesses.

[0057] Second, the outstanding advantage of this equipment is that it is relatively small in size and low in cost, while being able to sew large pieces of fabric within 1 meter in length and width and strips of fabric as narrow as 40 millimeters.

[0058] Third, it has a material receiving device that adapts to the size and length of the fabric pieces, which can save manual time; people only need to put the fabric in.

[0059] Fourth, compared with other four-sided binding equipment that uses a robotic arm to rotate and bind the edges, this equipment does not require a template to press the fabric for binding, which means automatic binding without a template. This can meet the needs of binding various specifications and those who do not want any templates or want to switch templates.

[0060] In addition to the embodiments described above, within the scope disclosed in the claims and specification of this invention, the technical features or technical data of this invention can be reselected and combined to form new embodiments. These can be achieved by those skilled in the art without creative effort. Therefore, these embodiments not described in detail in this invention should also be regarded as specific embodiments of this invention and within the protection scope of this invention.

Claims

1. A four-sided binding machine, comprising a frame (7) and a sewing machine (1) mounted on the frame (7), wherein the upper surface of the frame (7) is provided with a sewing table (5), characterized in that... include: The rotating mechanism (2) is used for rotating the fabric piece and is located above the sewing table. It includes a rotating swing arm (24) and a pressing piece located under the rotating swing arm. The passive correction mechanism (3) is used for auxiliary correction of the fabric piece. It is set on the right side of the presser foot of the overlock sewing machine on the sewing table and includes a movable small correction wheel assembly and a large correction wheel assembly arranged sequentially along the fabric piece feeding direction of the overlock sewing machine. Active correction mechanism (8) is used for the movement and correction of the fabric piece. It is set on the front side of the presser foot of the overlock sewing machine on the sewing table and includes a fabric transfer timing belt that can contact the fabric piece and drive the fabric piece to move. The rear drag wheel mechanism (9) is used to stabilize the posture of the fabric at the end of sewing and the movement of the fabric after it leaves the overlock sewing machine. It is located on the left side of the presser foot of the overlock sewing machine on the sewing table and includes a rear drag wheel motor and a drag cloth synchronous belt driven by the rear drag wheel motor. An adaptive material collection device (10) is used for the automatic collection of fabric pieces after sewing. It is set on the left side of the overlock sewing machine on the sewing table and includes a material collection moving mechanism, a fabric pressing mechanism, a fabric dropping mechanism, and a material collection wheel mechanism. The small correction wheel assembly moves up and down by a small wheel lifting cylinder, and the large correction wheel assembly moves up and down by a large wheel lifting cylinder. The radial plane of the small correction wheel points obliquely backward toward the presser foot, and the radial plane of the large correction wheel points toward the presser foot of the overlock sewing machine.

2. The four-sided edge-sealing machine according to claim 1, characterized in that, A fixing frame (28) is provided on the sewing table. The fixing frame (28) is located on the left side of the overlock sewing machine (1). A central fixing plate (20) is horizontally arranged on the top of the fixing frame (28).

3. The four-sided edge-sealing machine according to claim 1, characterized in that, The four-sided binding machine also includes a fabric feeding mechanism (6), which is located on the frame below the right side of the sewing table (5). The fabric feeding mechanism (6) includes a fabric feeding cylinder (62) and a fabric feeding rod (60) connected to the fabric feeding cylinder. The upper end of the fabric feeding rod (60) is provided with a crossbar. The crossbar is horizontally positioned and perpendicular to the direction of fabric movement of the four-sided binding machine. The fabric feeding cylinder (62) drives the fabric feeding rod (60) to approach or move away from the sewing table (5).

4. The four-sided edge-sealing machine according to claim 2, characterized in that, The rear end of the rotating swing arm (24) is hinged to the shaft fixing plate (20) by a hinge pin (23). The middle end of the rotating swing arm (24) is connected to the drive rod of a rotating cylinder (29) by a connecting rod (241). A pressing component is provided at the front end of the rotating swing arm (24). A branch arm (242) is connected to the side of the middle end of the rotating swing arm (24). A pressing component is provided at the other end of the branch arm (242). The pressing component includes a pressing upper and lower cylinder (25) and a pressing block (26) fixed at the extended end of the pressing upper and lower cylinder (25). The pressing block under the rotating swing arm (24) is perpendicular to the pressing block under the branch arm.

5. The four-sided edge-sealing machine according to claim 4, characterized in that, A right-angle stop block (21) is provided on the outer side of the hinge between the shaft fixing plate (20) and the rotating swing arm (24). The right-angle stop block is fixed on the shaft fixing plate, and a hydraulic buffer (22) is provided on each of the two right-angle sides of the right-angle stop block.

6. The four-sided edge-sealing machine according to claim 1, characterized in that, A small sewing table (51) is provided on the sewing table near the overlock sewing machine (1). The small correction wheel assembly is located above the small sewing table (51) near the right side of the presser foot of the overlock sewing machine (1). The small sewing table (51) is also provided with a small fabric baffle (39) and a fabric sensor (40) for detecting fabric pieces. The large correction wheel assembly is located above the sewing table (5) to the right of the small correction wheel assembly. The large wheel lifting cylinder (33) drives the large correction wheel (36) to move back and forth through the large wheel front and rear extension cylinder (32). The large wheel front and rear extension cylinder (32) is fixed on the sewing table (5). A large fabric baffle (34) is provided on the rear side of the large correction wheel (36).

7. The four-sided edge-sealing machine according to claim 2, characterized in that, The shaft fixing plate (20) is provided with two forward parallel connecting arms (87). The front ends of the two connecting arms (87) pass through a fixing plate and are rotatably connected to mutually parallel swing arms (83). The two swing arms (83) are respectively connected to one end of the synchronous wheel lifting cylinder (84). A transmission synchronous belt assembly (85) is provided on both ends of one swing arm (83). The upper end of the transmission synchronous belt assembly (85) is connected to the cloth transfer drive motor (86), and the lower end is connected to the cloth transfer synchronous belt (80) through the rotating shaft (81) and the synchronous wheel. The lower ends of the two swing arms (83) are hinged to both ends of the synchronous wheel fixing plate (82). The synchronous wheel and the cloth transfer synchronous belt are set on the synchronous wheel fixing plate.

8. The four-sided edge-sealing machine according to claim 2, characterized in that, The rear tow wheel mechanism includes a power mechanism that drives the mop timing belt (94) to rotate and a lifting mechanism that drives the mop timing belt (94) up and down. The lifting mechanism includes a rear tow wheel cylinder (910). One end of the rear tow wheel cylinder (910) is hinged to the fixed frame (28), and the other end is hinged to one end of a long strip-shaped rear tow wheel connecting plate (99). The other end of the rear tow wheel connecting plate (99) is connected to a mop timing belt connecting plate (92). The mop timing belt (94) is provided on the mop timing belt connecting plate (92). The power mechanism includes a rear tow wheel motor (90). The rear tow wheel motor (90) is fixed to the lower part of the fixed frame (28). The output shaft of the rear tow wheel motor (90) is connected to the middle part of the rear tow wheel connecting plate (99). The output shaft of the rear tow wheel motor (90) and the other end of the rear tow wheel connecting plate are provided with a tow wheel timing belt (97).

9. The four-sided edge-sealing machine according to claim 1, characterized in that, The adaptive receiving device (10) is located at the bottom left side of the frame (7). Two parallel moving guide rails (210) are fixed on the frame (7). A moving slider (220) is provided on the moving guide rail (210). The adaptive receiving device (10) is located on the moving slider (220). A rack (250) is fixed on one side of the moving guide rail (210). A moving drive motor (230) is provided on the moving guide rail (210). The moving drive motor (230) is connected to the rack (250) through gears to drive the adaptive receiving device (10) to move left and right. The frame (7) is also provided with a receiving limit sensor (270) for limiting the extreme movement position of the adaptive receiving device (10).

10. The four-sided edge-sealing machine according to claim 1, characterized in that, The material receiving and moving mechanism is provided with several longitudinal material receiving frames (240) and two transverse material receiving frames. The transverse material receiving frames are located above the longitudinal material receiving frames (240) and are perpendicular to the direction of movement of the fabric pieces. The transverse material receiving frame on the left side is provided with a material receiving rod (370) for collecting fabric pieces, and the transverse material receiving frame on the right side is provided with a material receiving plate (540). The fabric pressing mechanism (300) is located to the left of the material receiving rod (370), the fabric dropping mechanism (400) is located to the right of the material receiving rod (370), and the material receiving wheel mechanism (500) is located to the right of the right transverse material receiving frame. The material receiving roller (530) in the material receiving wheel mechanism (500) is located above the material receiving plate (540).

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