A fabric guiding and pressing mechanism of a lockstitch sewing machine

Abstract

The application relates to the technical field of overlock machines and discloses a cloth guiding and pressing mechanism of an overlock machine, which comprises an overlock machine body, a guiding and pressing assembly arranged at the bottom of the overlock machine body, two conveying and guiding units, a spacing adjusting unit and an adjustable pressing unit, a spacing adjusting unit arranged at one side of the conveying and guiding unit, and an adjustable pressing unit assembled at the top of the spacing adjusting unit; the conveying and guiding unit comprises an L-shaped downward pressing rocker, a cloth guiding plate and a driving part; the guiding angle in the overlock process can be dynamically adjusted according to the actual deviation condition of the cloth through the arrangement of the driving part and the cloth guiding plate; the horizontal hydraulic cylinder drives the vertical rotating shaft to drive the cloth guiding plate to rotate forward or reversely in the horizontal plane, the guiding direction of the cloth guiding plate to the cloth is changed in real time, and the deviation problem caused by factors such as uneven cloth material, fluctuation of feeding speed or deviation of the operating angle can be effectively corrected.

Description

Technical Field

[0001] This invention relates to the field of overlock sewing machine technology, specifically to a fabric guiding and pressing mechanism for an overlock sewing machine. Background Technology

[0002] As a core piece of equipment in the garment processing industry, the performance of the fabric guiding and pressing mechanisms of overlock sewing machines directly determines the sewing quality and production efficiency. During the overlock sewing process, the fabric needs to be guided into the sewing area by the guiding mechanism, while the pressing mechanism applies appropriate pressure to ensure that the fabric is flat and adheres to the surface of the feed dog and needle plate, thereby ensuring uniform stitches and beautiful seams. Most commercially available overlock sewing machines employ a structure combining a fixed guide plate and a rigid presser foot. The guide plate is typically bolted to the machine head or worktable, and its guiding direction is locked after installation, making it impossible to dynamically adjust according to the actual fabric feeding. During actual sewing, due to the unevenness of the fabric material, fluctuations in sewing speed, and slight deviations in the operator's feed angle, the fabric is prone to lateral or deviation. Since the fixed guide plate cannot adjust the correction angle in real time, the sewing thread trajectory deviates from the preset path, severely affecting the quality of the finished product. Summary of the Invention

[0003] This invention provides a fabric guiding and pressing mechanism for an overlock sewing machine, which solves the problems of uneven fabric material, fluctuations in sewing speed, and slight deviations in the operator's feeding angle, which easily cause the fabric to shift left or right or run off-center.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a fabric guiding and pressing mechanism for an overlock sewing machine, comprising an overlock sewing machine body, a guiding and pressing assembly being provided at the bottom of the overlock sewing machine body, the guiding and pressing assembly being composed of two conveying and guiding units, a spacing adjustment unit and an adjustable pressing unit, a spacing adjustment unit being provided on one side of the conveying and guiding unit, and an adjustable pressing unit being assembled on the top of the spacing adjustment unit; The conveying and guiding unit includes an L-shaped downward pressing rocker, a fabric guide plate, and a driving unit. The bottom of the L-shaped downward pressing rocker is rotatably connected to the fabric guide plate, and the driving unit is used to drive the rotation of the fabric guide plate and adjust the guiding direction of the fabric guide plate. The spacing adjustment unit is used to adjust the spacing between the two conveying guide units, which is suitable for the overlocking needs of different fabrics; The adjustable pressing unit is used to adjust the height of the fabric guide plate and give it elastic potential energy. When the main body of the overlock sewing machine is operating, the fabric guide plate can stick to the fabric, so that it can always provide a guiding and pressing effect for the fabric.

[0005] By adopting the above technical solution, the guide pressing assembly consists of two conveying guide units, a spacing adjustment unit, and an adjustable pressing unit. The spacing adjustment unit adjusts the spacing between the two conveying guide units, so that the fabric guide plate can adapt to fabrics of different widths and ensure that the fabric is accurately positioned before entering the sewing area. The adjustable pressing unit adjusts the height of the fabric guide plate and gives it elastic potential energy, so that the fabric guide plate is always in close contact with the fabric surface during the operation of the overlock sewing machine, which provides a stable guiding pressing effect and avoids damage to the fabric caused by rigid contact. Meanwhile, the drive unit inside the conveying and guiding unit can drive the fabric guide plate to rotate, and adjust its guiding direction on the fabric in real time to effectively correct deviation. Through the coordinated cooperation of the spacing adjustment unit, the height and elasticity adjustment of the adjustable pressing unit, and the direction adjustment of the drive unit, the guiding and pressing assembly can achieve multi-dimensional adaptive guiding and pressing for fabrics of different specifications and thicknesses, significantly improving the stability of the overlock sewing process and the consistency of finished product quality.

[0006] Preferably, the drive unit includes a rectangular mounting box, inside which a horizontal hydraulic cylinder is fixed. The output end of the horizontal hydraulic cylinder is rotatably connected to a rectangular rotating arm. The bottom of one end of the rectangular rotating arm is rotatably connected to a transmission crank. Inside the transmission crank is a vertical rotating shaft, which passes through the interior of the rectangular mounting box and is rotatably connected to the rectangular mounting box via a bearing. The bottom of the vertical rotating shaft is fixedly connected to a fabric guide plate.

[0007] Preferably, a circular rotating ring is fixed to the outside of the vertical rotating shaft, and a circular rotating groove is provided inside the L-shaped downward pressing rocker. The vertical rotating shaft and the L-shaped downward pressing rocker are rotatably connected through the cooperation of the circular rotating ring and the circular rotating groove.

[0008] Preferably, a vertical connecting column is provided at the bottom of the rectangular mounting box and at one end away from the vertical rotation axis, and the bottom of the vertical connecting column is fixed to the L-shaped downward pressure rocker.

[0009] Preferably, the bottom of the fabric guide plate is provided with a plurality of guide grooves evenly distributed.

[0010] Preferably, the spacing adjustment unit includes a horizontal rotating handwheel, a U-shaped connecting frame is rotatably connected to the outer side of the horizontal rotating handwheel, a first horizontal threaded rod is fixed to one end of the horizontal rotating handwheel, a second horizontal threaded rod is rotatably connected to one end of the first horizontal threaded rod, the threads of the first horizontal threaded rod and the second horizontal threaded rod have opposite directions, and a horizontal moving column is threaded to the outer side of both the first horizontal threaded rod and the second horizontal threaded rod. One side of the horizontal moving column is connected to a corresponding rectangular mounting box. The U-shaped connecting frame also has a horizontal light rod fixed inside, which passes through the interior of the horizontal moving column and is slidably connected to the horizontal moving column.

[0011] Preferably, a partition is rotatably connected to the connection between the first transverse threaded rod and the second transverse threaded rod via a bearing, and the top of the partition is fixedly connected to the U-shaped connecting frame.

[0012] Preferably, the adjustable pressing unit includes an L-shaped connecting column. The top of the L-shaped connecting column is connected to the main body of the overlock sewing machine. Two arc-shaped mounting plates are fixed to the outer side of the L-shaped connecting column. A vertical rotating handwheel is rotatably connected to the top of one of the arc-shaped mounting plates. A vertical threaded rod is fixed to the bottom of the vertical rotating handwheel. A vertical lifting component is threadedly connected to the outer side of the vertical threaded rod. A horizontal connecting rod is fixed to one end of the vertical lifting component. Both ends of the bottom of the horizontal connecting rod are rotatably connected to oblique rotating components. An H-shaped connecting frame is rotatably connected to the bottom of the oblique rotating component. The bottom of the H-shaped connecting frame is connected to a U-shaped connecting frame.

[0013] Preferably, the oblique rotating component includes a first circular connector and a second circular connector. The bottom of the first circular connector is rotatably connected to the H-shaped connecting frame, and the top of the second circular connector is rotatably connected to the transverse connecting rod. A damping cylinder is provided between the first circular connector and the second circular connector, and an oblique spring is provided between the first circular connector and the second circular connector and located outside the damping cylinder.

[0014] Preferably, the L-shaped connecting column has a vertical sliding groove inside, and the vertical lifting component is located inside the vertical sliding groove and is slidably connected to the L-shaped connecting column through the vertical sliding groove.

[0015] This invention provides a fabric guiding and pressing mechanism for an overlock sewing machine. It has the following beneficial effects: 1. This invention, by setting up a drive unit and a fabric guide plate, enables the guide angle to be dynamically adjusted according to the actual deviation of the fabric during the overlocking process. The horizontal hydraulic cylinder drives the vertical rotating shaft to rotate the fabric guide plate in the horizontal plane in the forward or reverse direction, changing the guiding direction of the fabric guide plate on the fabric in real time. This effectively corrects the deviation problem caused by factors such as uneven fabric material, fluctuations in feeding speed, or deviations in operating angle, ensuring that the fabric enters the sewing area stably along the preset trajectory, improving the straightness and consistency of the sewing line trajectory, reducing sewing defects, and improving the finished product qualification rate and overlocking quality.

[0016] 2. This invention, by setting an adjustable pressing unit, allows the height and pressing force of the fabric guide plate to be flexibly adjusted according to the fabric thickness. The vertical rotating handwheel and the threaded engagement of the vertical lifting component enable precise setting of the initial height of the fabric guide plate, matching the pressing height with the fabric thickness and avoiding excessively deep or insufficient pressing. At the same time, the damping cylinder and the oblique spring work together to make the fabric guide plate elastically float with changes in fabric thickness, absorbing the impact of sudden thickness changes through elastic deformation. The spring restoring force of the oblique spring continuously provides a stable pressing force, achieving adaptive adjustment of the guiding pressing force. This maintains a uniform and stable pressing effect during the sewing of fabrics with uneven thickness, avoiding slippage and wrinkling, and improving the consistency of overlock sewing quality.

[0017] 3. This invention, by setting a spacing adjustment unit, enables the spacing between the two conveying guide units to quickly and accurately adapt to fabrics of different widths. In the spacing adjustment unit, the first and second transverse threaded rods have opposite thread directions. The operator only needs to turn the transverse rotating handwheel to drive the two transverse moving columns to move synchronously in opposite directions under the guidance of the transverse guide rod, so that the two sets of fabric guide plates can move closer or further away at the same time. The adjustment is simple, quick and accurate, without the need for additional tools or complicated disassembly and assembly, shortening the equipment changeover time and improving the versatility and production efficiency of the overlock sewing machine in processing different specifications of fabrics. It is especially suitable for flexible production modes with small batches and multiple varieties. Attached Figure Description

[0018] Figure 1 This is a perspective view of the entire invention; Figure 2 This is a schematic diagram of the main body of the overlock sewing machine and the guide pressing assembly of the present invention; Figure 3 This is a schematic diagram of the structural composition of the guide pressing assembly of the present invention; Figure 4 This is a cross-sectional view of the internal structure of the L-shaped connecting column of the present invention; Figure 5 This is a cross-sectional view of the interior of the rectangular mounting box of the present invention; Figure 6 This is an exploded view showing the connection between the L-shaped downward pressure rocker and the fabric guide plate of the present invention. Figure 7 This is an exploded view of the connection between the transverse guide rod and the U-shaped connecting frame of the present invention; Figure 8 This is a cross-sectional view of the interior of the L-shaped connecting column of the present invention; Figure 9 This is a schematic diagram showing the connection between the damping cylinder and the oblique spring of the present invention.

[0019] Among them, 100 is the main body of the overlock sewing machine; 200 is the guide pressing assembly; 210. Conveying and guiding unit; 211. L-shaped downward pressure rocker; 212. Fabric guide plate; 213. Rectangular mounting box; 214. Vertical connecting column; 215. Vertical rotating shaft; 216. Transmission crank; 217. Rectangular rotating arm; 218. Horizontal hydraulic cylinder; 220. Spacing adjustment unit; 221. U-shaped connecting frame; 222. Horizontal rotating handwheel; 223. First horizontal threaded rod; 224. Second horizontal threaded rod; 225. Horizontal moving column; 226. Horizontal smooth rod; 230. Adjustable pressing unit; 231. L-shaped connecting column; 232. H-shaped connecting frame; 233. Angled rotating component; 234. Horizontal connecting rod; 235. Arc-shaped mounting plate; 236. Vertical rotating handwheel; 237. Vertical threaded rod; 238. Vertical lifting component; 239. First circular connecting component; 240. Second circular connecting component; 241. Damping cylinder; 242. Angled spring. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see the appendix Figure 1 -Appendix Figure 9 This invention provides a fabric guiding and pressing mechanism for an overlock sewing machine, including an overlock sewing machine body 100. A guiding and pressing assembly 200 is provided at the bottom of the overlock sewing machine body 100. The guiding and pressing assembly 200 consists of two conveying and guiding units 210, a spacing adjustment unit 220, and an adjustable pressing unit 230. A spacing adjustment unit 220 is provided on one side of the conveying and guiding unit 210, and an adjustable pressing unit 230 is assembled on the top of the spacing adjustment unit 220. The conveying and guiding unit 210 includes an L-shaped downward pressure rocker 211, a fabric guide plate 212, and a driving unit. The bottom of the L-shaped downward pressure rocker 211 is rotatably connected to the fabric guide plate 212. The driving unit is used to drive the rotation of the fabric guide plate 212 and adjust the guiding direction of the fabric guide plate 212. The spacing adjustment unit 220 is used to adjust the spacing between the two conveying guide units 210, which is suitable for the overlocking requirements of different fabrics; The adjustable pressing unit 230 is used to adjust the position and height of the fabric guide plate 212 and give it elastic potential energy. When the overlock sewing machine body 100 is in operation, the fabric guide plate 212 can be in close contact with the fabric, so that it always provides a guiding pressing effect for the fabric.

[0022] The guide pressing assembly 200, through the modular cooperation of the conveying guide unit 210, the spacing adjustment unit 220 and the adjustable pressing unit 230, enables the equipment to be adjusted in multiple dimensions according to the fabric width, thickness and direction. The spacing adjustment unit 220 can accurately adapt to fabrics of different widths, and the adjustable pressing unit 230 enables the fabric guide plate 212 to have elastic floating capability, which can provide stable pressing and avoid rigid damage, significantly improving the adaptability of the overlock sewing process and the consistency of finished product quality. Please see the appendix Figure 4 and attached Figure 6 The drive unit includes a rectangular mounting box 213. A horizontal hydraulic cylinder 218 is fixed inside the rectangular mounting box 213. A rectangular rotating arm 217 is rotatably connected to the output end of the horizontal hydraulic cylinder 218. A transmission crank 216 is rotatably connected to the bottom of one end of the rectangular rotating arm 217. A vertical rotating shaft 215 is fixed inside the transmission crank 216. The vertical rotating shaft 215 passes through the interior of the rectangular mounting box 213 and is rotatably connected to the rectangular mounting box 213 through a bearing. The bottom of the vertical rotating shaft 215 is fixedly connected to the fabric guide plate 212. The activation of the horizontal hydraulic cylinder 218 enables the transmission crank 216 to rotate the vertical rotating shaft 215 via the rectangular rotating arm 217. This, in turn, causes the vertical rotating shaft 215 to rotate the fabric guide plate 212, allowing the fabric guide plate 212 to adjust its guiding direction. This achieves dynamic and precise adjustment of the angle of the fabric guide plate 212, effectively correcting deviation problems caused by uneven fabric material, fluctuations in feeding speed, or deviations in operating angle. It ensures that the fabric enters the sewing area stably along the preset trajectory, significantly improving the straightness and consistency of the sewing line and reducing the sewing defect rate. Please see the appendix Figure 4 and attached Figure 6 A circular rotating ring is fixed on the outside of the vertical rotating shaft 215, and a circular rotating groove is opened inside the L-shaped downward pressing rocker plate 211. The vertical rotating shaft 215 and the L-shaped downward pressing rocker plate 211 are rotatably connected through the cooperation of the circular rotating ring and the circular rotating groove. By setting up a circular rotating ring and a circular rotating groove, the vertical rotating shaft 215 can rotate inside the L-shaped downward pressing rocker plate 211, and the rotation of the vertical rotating shaft 215 can drive the fabric guide plate 212 to rotate. Please see the appendix Figure 4 and attached Figure 6 A vertical connecting post 214 is provided at the bottom of the rectangular mounting box 213 and at one end away from the vertical rotation axis 215. The bottom of the vertical connecting post 214 is fixed to the L-shaped downward pressure rocker plate 211. This allows the vertical rotating shaft 215 to rotate, and the connection between the vertical connecting column 214 and the L-shaped downward pressing rocker 211 prevents the L-shaped downward pressing rocker 211 from moving. This ensures that the fabric guide plate 212 can only rotate at the bottom of the L-shaped downward pressing rocker 211, and the rotation of the fabric guide plate 212 does not affect the position of the L-shaped downward pressing rocker 211. The combination of the circular rotating ring and the circular rotating groove, as well as the fixed setting of the vertical connecting column 214, optimizes the constraint method of rotation. This ensures both the flexibility of the fabric guide plate 212 angle adjustment and the L-shaped downward pressure rocker plate 211 maintaining a fixed position during dynamic adjustment. This maintains structural stability during frequent correction operations and extends the service life of the mechanism. Please see the appendix Figure 4 and attached Figure 6 The bottom of the fabric guide plate 212 is evenly provided with multiple guide grooves. By setting the guide grooves, when the fabric passes through the bottom surface of the fabric guide plate 212, the structural design of the guide grooves increases the frictional contact between the fabric guide plate 212 and the fabric, and provides reliable lateral guidance without the need for additional clamping force. This helps to improve the feeding stability of thin or smooth fabrics during high-speed overlock sewing and reduce sewing deviations caused by slippage. Please see the appendix Figure 7 The spacing adjustment unit 220 includes a horizontal rotating handwheel 222. A U-shaped connecting frame 221 is rotatably connected to the outer side of the horizontal rotating handwheel 222. A first horizontal threaded rod 223 is fixed to one end of the horizontal rotating handwheel 222. A second horizontal threaded rod 224 is rotatably connected to one end of the first horizontal threaded rod 223. The threads of the first horizontal threaded rod 223 and the second horizontal threaded rod 224 have opposite directions. A horizontal moving column 225 is threaded to the outer side of both the first horizontal threaded rod 223 and the second horizontal threaded rod 224. One side of the horizontal moving column 225 is connected to a corresponding rectangular mounting box 213. The U-shaped connecting frame 221 also has a horizontal smooth rod 226 fixed inside. The horizontal smooth rod 226 passes through the interior of the horizontal moving column 225 and is slidably connected to the horizontal moving column 225. The horizontal smooth rod 226 allows the horizontal moving column 225 to move laterally outside the horizontal smooth rod 226. By rotating the horizontal rotating handwheel 222, the first horizontal threaded rod 223 and the second horizontal threaded rod 224 can be rotated, allowing the horizontal moving column 225 to move outside the horizontal smooth rod 226. Since the threads of the first horizontal threaded rod 223 and the second horizontal threaded rod 224 are opposite, the two horizontal moving columns 225 move in opposite directions, which in turn makes the two L-shaped downward pressure rocker plates 211 move in opposite directions. By guiding the first transverse threaded rod 223, the second transverse threaded rod 224 and the transverse smooth rod 226 with opposite rotation directions, the synchronous centering movement of the two conveying guide units 210 is achieved. The adjustment process is simple and quick and does not require additional tools, which greatly shortens the equipment changeover time and enables the overlock sewing machine to quickly adapt to the flexible production needs of small batches and multiple varieties, significantly improving the equipment's versatility and production changeover efficiency. Please see the appendix Figure 7 A partition plate is rotatably connected to the connection between the first transverse threaded rod 223 and the second transverse threaded rod 224 via a bearing, and the top of the partition plate is fixedly connected to the U-shaped connecting frame 221. By setting the partition, the connection between the first transverse threaded rod 223 and the second transverse threaded rod 224 can be more stable, preventing the connection between the first transverse threaded rod 223 and the second transverse threaded rod 224 from bending during rotation, so that the first transverse threaded rod 223 and the second transverse threaded rod 224 can rotate synchronously. Please see the appendix Figure 8 and attached Figure 9 The adjustable pressing unit 230 includes an L-shaped connecting column 231. The top of the L-shaped connecting column 231 is connected to the body 100 of the overlock sewing machine. Two arc-shaped mounting plates 235 are fixed on the outside of the L-shaped connecting column 231. A vertical rotating handwheel 236 is rotatably connected to the top of one of the arc-shaped mounting plates 235. A vertical threaded rod 237 is fixed to the bottom of the vertical rotating handwheel 236. A vertical lifting member 238 is threadedly connected to the outside of the vertical threaded rod 237. A horizontal connecting rod 234 is fixed to one end of the vertical lifting member 238. An oblique rotating member 233 is rotatably connected to both ends of the bottom of the horizontal connecting rod 234. An H-shaped connecting frame 232 is rotatably connected to the bottom of the oblique rotating member 233. The bottom of the H-shaped connecting frame 232 is connected to a U-shaped connecting frame 221. The vertical handwheel 236 is manually rotated, which in turn rotates the vertical threaded rod 237. This rotation causes the vertical lifting component 238 to move the horizontal connecting rod 234 vertically, allowing the H-shaped connecting frame 232 to move vertically within the L-shaped connecting column 231. This change in the height of the H-shaped connecting frame 232 allows for precise, stepless adjustment of the initial height of the fabric guide plate 212 for fabrics of different thicknesses. The operation is intuitive and has good self-locking properties, preventing pressure height drift caused by vibration and ensuring precise matching of pressure parameters to the fabric thickness, thus preventing quality problems such as excessively deep indentations or insufficient pressure. Please see the appendix Figure 9The oblique rotating component 233 includes a first circular connector 239 and a second circular connector 240. The bottom of the first circular connector 239 is rotatably connected to the H-shaped connecting frame 232, and the top of the second circular connector 240 is rotatably connected to the transverse connecting rod 234. A damping cylinder 241 is provided between the first circular connector 239 and the second circular connector 240. An oblique spring 242 is provided between the first circular connector 239 and the second circular connector 240 and outside the damping cylinder 241. The telescopic rod of the damping cylinder 241 can slide inside the cylinder body, and the oblique spring 242 can undergo elastic deformation. Together, they provide elastic buffering and damping for the H-type connecting frame 232, so that the fabric guide plate 212 has both buffering and active pressing functions when it floats with the change of fabric thickness. It can absorb the impact caused by the sudden change in thickness and avoid fabric damage. It can also maintain a constant pressing force by relying on the oblique spring 242, maintain a uniform and stable pressing effect in the sewing process of fabrics with uneven thickness, effectively prevent slippage and wrinkling, and improve the consistency of overlock sewing quality. Please see the appendix Figure 8 The L-shaped connecting column 231 has a vertical sliding groove inside, and the vertical lifting component 238 is located inside the vertical sliding groove and is slidably connected to the L-shaped connecting column 231 through the vertical sliding groove. The vertical chute allows the vertical lifting component 238 to slide vertically inside the L-shaped connecting column 231. This movement of the vertical lifting component 238 enables the horizontal connecting rod 234 to adjust its vertical position. The guide structure of the vertical chute enhances the linearity and stability of the lifting motion, avoids jamming or tilting caused by eccentric loads, ensures the accuracy and reliability of height adjustment, and facilitates the rapid restoration of a consistent pressing state when switching between multiple fabric types, thereby improving the stability of equipment operation.

[0023] Work process: Before the operation, according to the width of the fabric to be overlocked, manually rotate the horizontal rotating handwheel 222 to drive the first horizontal threaded rod 223 and the second horizontal threaded rod 224 to rotate synchronously, drive the horizontal moving column 225 to move in the opposite direction in the horizontal direction under the guidance of the horizontal smooth rod 226, thereby adjusting the distance between the two sets of rectangular mounting boxes 213 so that the distance between the fabric guide plates 212 matches the width of the fabric to be overlocked. According to the fabric thickness, manually rotate the vertical rotating handwheel 236 to drive the vertical threaded rod 237 to rotate, which in turn drives the vertical lifting component 238 to rise and fall in the vertical groove of the L-shaped connecting column 231. Through the horizontal connecting rod 234 and the oblique rotating component 233, the H-shaped connecting frame 232 is driven to rise and fall. The H-shaped connecting frame 232 drives the spacing adjustment unit 220 and the conveying guide unit 210 to rise and fall as a whole, thereby adjusting the initial height and static clamping force of the fabric guide plate 212. During operation, when the fabric deviates, the horizontal hydraulic cylinder 218 is activated, and its piston rod extends and retracts to drive the rectangular rotating arm 217 to move. The oscillation is converted into rotation through the transmission crank 216, which drives the vertical rotating shaft 215 to rotate in the forward or reverse direction inside the L-shaped lower pressure rocker plate 211. The vertical rotating shaft 215 directly drives the bottom fabric guide plate 212 to rotate in the horizontal plane, dynamically changing the guiding angle of the fabric guide plate 212 on the fabric, thereby correcting the fabric deviation. When the fabric thickness changes and generates a reaction force, this force is transmitted to the inclined rotating component 233 through the H-shaped connecting frame 232. The damping cylinder 241 inside the inclined rotating component 233 extends and retracts to buffer the movement, while the inclined spring 242 elastically deforms, enabling the fabric guide plate 212 to float up and down with the fabric's undulations. Relying on the elastic restoring force of the inclined spring 242, the fabric guide plate 212 is kept in close contact with the fabric surface, providing continuous and stable guiding pressure.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fabric guiding and pressing mechanism for an overlock sewing machine, comprising the overlock sewing machine body (100), characterized in that, The bottom of the overlock sewing machine body (100) is provided with a guide pressing assembly (200), which consists of two conveying guide units (210), a spacing adjustment unit (220) and an adjustable pressing unit (230). The spacing adjustment unit (220) is provided on one side of the conveying guide unit (210), and the adjustable pressing unit (230) is assembled on the top of the spacing adjustment unit (220). The conveying and guiding unit (210) includes an L-shaped downward pressure rocker (211), a fabric guide plate (212), and a driving unit. The bottom of the L-shaped downward pressure rocker (211) is rotatably connected to the fabric guide plate (212). The driving unit is used to drive the rotation of the fabric guide plate (212) and adjust the guiding direction of the fabric guide plate (212). The spacing adjustment unit (220) is used to adjust the spacing between the two conveying guide units (210), which is suitable for the overlocking requirements of different fabrics; The adjustable pressing unit (230) is used to adjust the position and height of the fabric guide plate (212) and give it elastic potential energy. When the main body (100) of the overlock sewing machine is in operation, the fabric guide plate (212) can be in close contact with the fabric, so that it always provides a guiding pressing effect for the fabric.

2. The fabric guiding and pressing mechanism of an overlock sewing machine according to claim 1, characterized in that, The drive unit includes a rectangular mounting box (213), inside which a horizontal hydraulic cylinder (218) is fixed. A rectangular rotating arm (217) is rotatably connected to the output end of the horizontal hydraulic cylinder (218). A transmission crank (216) is rotatably connected to the bottom of one end of the rectangular rotating arm (217). A vertical rotating shaft (215) is fixed inside the transmission crank (216). The vertical rotating shaft (215) passes through the interior of the rectangular mounting box (213) and is rotatably connected to the rectangular mounting box (213) through a bearing. The bottom of the vertical rotating shaft (215) is fixedly connected to the fabric guide plate (212).

3. The fabric guiding and pressing mechanism of an overlock sewing machine according to claim 2, characterized in that, A circular rotating ring is fixed on the outside of the vertical rotating shaft (215), and a circular rotating groove is provided inside the L-shaped downward pressing rocker (211). The vertical rotating shaft (215) and the L-shaped downward pressing rocker (211) are rotatably connected by the cooperation of the circular rotating ring and the circular rotating groove.

4. The fabric guiding and pressing mechanism of an overlock sewing machine according to claim 2, characterized in that, A vertical connecting column (214) is provided at the bottom of the rectangular mounting box (213) and at one end away from the vertical rotation axis (215). The bottom of the vertical connecting column (214) is fixed to the L-shaped downward pressure rocker (211).

5. The fabric guiding and pressing mechanism of an overlock sewing machine according to claim 2, characterized in that, The bottom of the fabric guide plate (212) is evenly provided with multiple guide grooves.

6. The fabric guiding and pressing mechanism of an overlock sewing machine according to claim 2, characterized in that, The spacing adjustment unit (220) includes a horizontal rotating handwheel (222), a U-shaped connecting frame (221) is rotatably connected to the outer side of the horizontal rotating handwheel (222), a first horizontal threaded rod (223) is fixed to one end of the horizontal rotating handwheel (222), a second horizontal threaded rod (224) is rotatably connected to one end of the first horizontal threaded rod (223), the threads of the first horizontal threaded rod (223) and the second horizontal threaded rod (224) are opposite in direction, and a horizontal moving column (225) is threaded to the outer side of both the first horizontal threaded rod (223) and the second horizontal threaded rod (224), and one side of the horizontal moving column (225) is connected to a corresponding rectangular mounting box (213); The U-shaped connecting frame (221) also has a horizontal light rod (226) fixed inside. The horizontal light rod (226) passes through the interior of the horizontal moving column (225) and is slidably connected to the horizontal moving column (225).

7. The fabric guiding and pressing mechanism of an overlock sewing machine according to claim 6, characterized in that, A partition is rotatably connected to the connection between the first transverse threaded rod (223) and the second transverse threaded rod (224) via a bearing, and the top of the partition is fixedly connected to the U-shaped connecting frame (221).

8. The fabric guiding and pressing mechanism of an overlock sewing machine according to claim 6, characterized in that, The adjustable pressing unit (230) includes an L-shaped connecting column (231). The top of the L-shaped connecting column (231) is connected to the body of the overlock sewing machine (100). Two arc-shaped mounting plates (235) are fixed on the outside of the L-shaped connecting column (231). A vertical rotating handwheel (236) is rotatably connected to the top of one of the arc-shaped mounting plates (235). A vertical threaded rod (237) is fixed to the bottom of the vertical rotating handwheel (236). A vertical lifting member (238) is threadedly connected to the outside of the vertical threaded rod (237). A horizontal connecting rod (234) is fixed to one end of the vertical lifting member (238). An oblique rotating member (233) is rotatably connected to both ends of the bottom of the horizontal connecting rod (234). An H-shaped connecting frame (232) is rotatably connected to the bottom of the oblique rotating member (233). The bottom of the H-shaped connecting frame (232) is connected to a U-shaped connecting frame (221).

9. The fabric guiding and pressing mechanism of an overlock sewing machine according to claim 8, characterized in that, The oblique rotating component (233) includes a first circular connector (239) and a second circular connector (240). The bottom of the first circular connector (239) is rotatably connected to the H-shaped connecting frame (232), and the top of the second circular connector (240) is rotatably connected to the transverse connecting rod (234). A damping cylinder (241) is provided between the first circular connector (239) and the second circular connector (240), and an oblique spring (242) is provided between the first circular connector (239) and the second circular connector (240) and outside the damping cylinder (241).

10. The fabric guiding and pressing mechanism of an overlock sewing machine according to claim 9, characterized in that, The L-shaped connecting column (231) has a vertical sliding groove inside, and the vertical lifting component (238) is located inside the vertical sliding groove and is slidably connected to the L-shaped connecting column (231) through the vertical sliding groove.

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