A high speed overlock machine

Abstract

The application relates to the technical field of overlock machines, and discloses a high-speed overlock machine which comprises an overlock machine body, a presser foot located at one side of the overlock machine body, a workbench located at the position of the presser foot, a pressing disc used for pressing a fabric on the upper surface of the workbench, a long slot with an extending direction parallel to the side edge of the presser foot is arranged on one side of the workbench close to the presser foot, a slider in a rectangular shape and with a side wall matched with the side wall of the long slot is arranged in the long slot, a cylindrical iron block is arranged at the upper end of the slider, a magnet sleeve used for attracting the cylindrical iron block after the cylindrical iron block is embedded is arranged at the center of the lower surface of the pressing disc, and a pressing assembly used for pushing the cylindrical iron block downwards into the long slot after overlock is arranged on the upper side of the pressing disc. The position of the pressing disc relative to the presser foot can be positioned through the cylindrical iron block, then the fabric can be driven to rotate by rotating the pressing disc, the fabric can be overlocked through the presser foot after the fabric is rotated, and finally the operator can conveniently and accurately overlock the fabric.

Description

Technical Field

[0001] This invention belongs to the field of overlock sewing machine technology, and specifically relates to a high-speed overlock sewing machine. Background Technology

[0002] Overlock sewing machines, also known as hemming machines, edge-sealing machines, or binding machines, are generally available in three-thread, four-thread, and five-thread configurations. Their primary function is to prevent pilling at the seams of garments. Besides hemming, overlock sewing machines can also be used to sew T-shirts, sportswear, underwear, knitwear, and other fabrics. Overlock sewing machines can perform cutting and sewing simultaneously, producing mesh-like stitches, and are also suitable for elastic fabrics.

[0003] Currently, Chinese utility model patent CN208857457U, published on May 14, 2019, discloses an overlock sewing machine, including a frame with a mounting panel on top. The top surface of the mounting panel is fixed with the overlock sewing machine body. A needle bar chamber is installed on the top of the overlock sewing machine body, and a presser foot lifting rod is installed at the bottom of the needle bar chamber. The bottom end of the presser foot lifting rod is connected to a presser foot. An oil dipstick is installed on the outer surface of the overlock sewing machine body. A pulley and an oil dipstick are installed on the side of the overlock sewing machine body. An oil window is installed on one side of the needle bar chamber, located on the top of the overlock sewing machine body. Several tension nuts are installed on the front panel of the overlock sewing machine body. Four needle bars are arranged in the needle bar chamber.

[0004] This type of overlock sewing machine uses four-thread overlock sewing. The four-thread overlock sewing, especially the double-needle four-thread stitch, adds one more needle thread compared to the three-thread overlock sewing, which greatly improves the strength of the sewn fabric. It can be used for sewing pieces of high-end clothing or for parts that are subjected to a lot of stretching and friction (such as shoulder and sleeve joints), especially for sewing outerwear.

[0005] The overlock sewing machine can perform edge binding on the fabric side as soon as the fabric enters the presser foot. However, when binding the curved edge of the fabric side, such as binding the semi-circular end of the sock toe, it is often necessary to use instruments such as precise cylinders and motors to achieve accurate binding, which increases the purchase and maintenance costs. If the binding is done manually, it is easy to produce irregular curves, which ultimately causes a lot of trouble for curved edge binding. Summary of the Invention

[0006] The purpose of this invention is to provide a high-speed overlock sewing machine that facilitates convenient and accurate semi-circular edge binding for operators.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a high-speed overlock sewing machine, including an overlock sewing machine body, a presser foot located on one side of the overlock sewing machine body, a worktable located at the presser foot position, and a pressure plate for pressing the fabric onto the surface of the worktable. A long groove extending parallel to the side of the presser foot is provided on the side of the worktable. A rectangular slider with its sidewalls fitting against the sidewalls of the long groove is provided in the long groove. A cylindrical iron block is provided at the upper end of the slider. A magnetic sleeve for the cylindrical iron block to be inserted and attracted is provided at the center of the lower surface of the pressure plate. A pressing component is provided on the upper side of the pressure plate for pushing the cylindrical iron block downward into the long groove after the overlock is completed.

[0008] By adopting the above technical solution, when semi-circular hemming is required, the pressure plate presses the fabric to be hemmed onto the surface of the worktable. Then, the fabric is moved to the position of the long groove. Under the attraction of the magnetic sleeve, the cylindrical iron block on the slider can be embedded in the magnetic sleeve and attracted. At this time, the cylindrical iron block can be used to position the pressure plate relative to the presser foot. Then, the operator rotates the pressure plate to drive the fabric to rotate. After the fabric rotates, the presser foot can be used to perform semi-circular hemming. After the semi-circular hemming is completed, the pressing component pushes the cylindrical iron block down into the long groove, and then the pressure plate is removed from the position of the long groove, thereby completing the separation of the pressure plate and the cylindrical iron block. Ultimately, this allows the operator to perform semi-circular hemming conveniently and accurately.

[0009] A further feature of the present invention is that the slider has an oblong hole extending in the vertical direction, and a limiting rod passing through the oblong hole is provided in the elongated groove.

[0010] By adopting the above technical solution, the limiting rod passes through the waist-shaped hole on the slider, and the waist-shaped hole extends in the vertical direction. At this time, the position of the slider after it moves up can be limited, so that the slider can move up and down in the long groove while preventing the slider from falling out of the long groove.

[0011] A further configuration of the present invention is as follows: one end of the elongated groove is on the same horizontal line as the presser foot, and the pressing assembly includes a vertical sleeve disposed on the upper side of the press plate and extending vertically upward, a grip sleeve disposed on the upper end of the vertical sleeve and for the operator to hold, a reset spring disposed inside the grip sleeve with its lower end in contact with the vertical sleeve and its upper end connected to the top of the grip sleeve, and a push rod disposed inside the top of the grip sleeve and extending vertically downward into the vertical sleeve.

[0012] By adopting the above technical solution, the operator presses down on the hand grip sleeve, and the return spring is compressed. Then the push rod can move down and abut against the cylindrical iron block. At this time, the cylindrical iron block can be pressed out of the magnet sleeve by the push rod, so that the cylindrical iron block and the slider are pressed into the long groove.

[0013] A further feature of the present invention is that: anti-slip stripes are provided on the outer periphery of the grip sleeve; a communicating spiral guide groove is provided on both sides of the vertical sleeve; a guide post is provided on the inner wall of the grip sleeve and embedded in the spiral guide groove; a guide wheel is provided on the guide post and abuts against the inner wall of the spiral guide groove; and the upper and lower positions of the ends of the spiral guide groove are in a staggered distribution.

[0014] By adopting the above technical solution, when a semi-circular edging is required, the operator needs to rotate the pressure plate 180 degrees. At this time, the vertical sleeve has interconnected spiral guide grooves on both sides, and the guide wheel on the grip sleeve is embedded in the spiral guide groove. When the operator presses down on the grip sleeve, the guide wheel can roll down from the top of the spiral guide groove to the bottom of the spiral guide groove. At this time, the guide wheel can drive the vertical sleeve to rotate 180 degrees, thus completing the semi-circular edging of the sock toe while pressing down on the grip sleeve. At the same time, after releasing the grip sleeve, under the elastic restoring force of the return spring, the guide wheel can roll down from the bottom of the spiral guide groove to the top of the spiral guide groove, thus waiting for the next press.

[0015] The staggered distribution of the upper and lower positions of the spiral guide groove ends limits the direction of movement of the guide wheel within the two spiral guide grooves, causing the vertical sleeve to rotate in the same direction.

[0016] A further feature of the present invention is that a connecting spring sleeved on a limiting rod is provided inside the elongated groove, one end of the connecting spring is connected to the inner wall of the elongated groove and the other end is pressed against the side wall of the slider, and a cutting assembly is provided on the worktable to cut the edge line after the pressure plate moves away from the pressure foot.

[0017] By adopting the above technical solution, when the pressure plate moves away from the pressure foot, the cylindrical iron block that leaves the magnetic sleeve is still attracted to the magnetic sleeve. Therefore, the movement of the pressure plate will also drive the slider to move in the long groove, and the connecting spring will be compressed. Then the cutting component can be used to cut the edge binding line, thereby completing the entire edge binding operation.

[0018] A further feature of the present invention is that: a dovetail groove is provided on the upper surface of the slider; a dovetail slide rod is provided on the lower side of the cylindrical iron block away from the presser foot and embedded in the dovetail groove; and a U-shaped opening groove is provided at the end of the long groove and on the side near the presser foot for the cylindrical iron block to be embedded.

[0019] By adopting the above technical solution, in order to prevent the side of the fabric from being pressed into the underside of the presser foot after the presser plate rotates 180 degrees, an opening groove is opened at the end of the long groove and on the side near the presser foot. When the presser plate drives the cylindrical iron block to embed into the opening groove, the toe fabric can begin to be edged. After rotating 180 degrees, the presser plate drives the cylindrical iron block to move away from the opening groove. At this time, the side of the toe fabric can be separated from the presser foot, and the side of the toe fabric after the semi-circular edge is finished can be prevented from being pressed into the underside of the presser foot.

[0020] A further configuration of the present invention is as follows: the cutting assembly includes an upper blade disposed on the side of the worktable, a lower blade disposed below the upper blade and hinged at one end to the lower side of the worktable, a first guide ring disposed on the side of the upper blade, a fixed arm disposed on the side of the worktable near the lower blade, a second guide ring disposed at the end of the fixed arm, a third guide ring disposed on the lower surface of the worktable, a through hole formed on the inner wall of the long groove away from the slider and communicating with the lower surface of the worktable, and a connecting rope having one end connected to the side wall of the slider and the other end passing through the through hole, the third guide ring, the second guide ring, and the first guide ring in sequence and then connected to the lower blade away from the worktable. The lower cutting edge of the upper blade extends downward at an angle away from the worktable, and the upper cutting edge of the lower blade extends upward at an angle away from the worktable and intersects with the lower cutting edge of the upper blade.

[0021] By adopting the above technical solution, when the pressure plate moves away from the presser foot, the connecting spring is compressed, and the connecting rope is relaxed. Therefore, the lower blade swings downward under its own weight, and the space between the upper and lower blades can be used for the binding thread to pass through. At the same time, when the magnetic sleeve and the cylindrical iron block are released due to the movement of the pressure plate, the slider can move towards the presser foot under the elastic restoring force of the connecting spring. At this time, the slider can drive the connecting rope, making the connecting rope straight. Then, the connecting rope can drive the lower blade to swing upward. Finally, the binding thread can be cut by the shearing force between the upper and lower blades. There is no need for the operator to manually pick up scissors to cut the binding thread, making the semi-circular binding process of the entire sock toe more convenient and faster.

[0022] A further feature of the present invention is that a gap is left between the magnet sleeve and the cylindrical iron block for the fabric to be pressed in.

[0023] By adopting the above technical solution, the gap between the magnet sleeve and the cylindrical iron block can be used to press the fabric in, thereby avoiding the presence of the fabric affecting the embedding of the cylindrical iron block into the magnet sleeve.

[0024] A further feature of the present invention is that an L-shaped positioning plate for positioning the fabric is provided on the side of the worktable away from the presser foot.

[0025] By adopting the above technical solution, the sock toe fabric to be bound is placed flat on the worktable, where the L-shaped positioning plate can be used to fit the side of the sock toe fabric, which is conducive to the pressure plate pressing accurately on the sock toe fabric.

[0026] A further feature of the present invention is that a semi-circular arc-shaped positioning arc plate is provided on the upper side of the side of the positioning plate for the pressure plate to pass through, and a hinge arm is provided on the outer wall of the middle part of the positioning arc plate, which is hinged to the positioning plate.

[0027] By adopting the above technical solution, the sock toe fabric can be easily placed on the workbench surface after the positioning arc plate is flipped upward, and the position of the pressure plate on the sock toe fabric can be positioned by the positioning arc plate after the positioning arc plate is flipped downward, which ultimately helps to make the semi-circular arc edge binding of the sock toe fabric more accurate.

[0028] The beneficial effects of this invention are as follows: When it is necessary to perform semi-circular arc binding on the toe fabric, the positioning plate and the positioning arc plate are first used to position the positional relationship between the pressure plate and the toe fabric, so that the pressure plate accurately presses the toe fabric onto the surface of the workbench. Then, the pressure plate is moved so that the toe fabric moves to the position of the long groove. Under the attraction of the magnetic sleeve, the slider moves up and the cylindrical iron block can be embedded in the magnetic sleeve and attracted. Then, the pressure plate drives the cylindrical iron block to be embedded in the opening groove, and the toe fabric is ready to start the binding process. The cylindrical iron block can be used to position the pressure plate relative to the presser foot.

[0029] The operator then holds the grip and presses it down. Utilizing the interconnected spiral guide grooves on both sides of the vertical sleeve, and the guide wheels on the grip embedded within these grooves, the guide wheels roll down from the top to the bottom of the spiral guide groove as the operator presses down. This causes the vertical sleeve to rotate 180 degrees, completing the semi-circular hem of the sock toe during the downward press. Simultaneously, as the grip is pressed down, the push rod moves downward and contacts the cylindrical iron block. The push rod then presses the cylindrical iron block out of the magnetic sleeve, causing it and the slider to be pressed into the long groove. Although the cylindrical iron block is removed from the magnetic sleeve, it remains attracted to it. The pressure plate is then moved, causing the cylindrical iron block to move away from the opening groove. This separates the side of the sock toe fabric from the presser foot, preventing the side of the sock toe fabric from being pressed under the presser foot after the semi-circular hem is completed.

[0030] Then, the pressure plate can be moved away from the presser foot. Since the magnetic sleeve and the cylindrical iron block are still in an attractive state, the slider moves in the connecting groove, and the connecting spring is compressed, so the connecting rope is relaxed. Therefore, the lower blade swings downward under its own weight. At this time, the space between the upper and lower blades can be used for the binding line to pass through as the pressure plate moves. At the same time, when the magnetic sleeve and the cylindrical iron block are released due to the movement of the pressure plate, the slider can move towards the presser foot under the elastic restoring force of the connecting spring. At this time, the slider can drive the connecting rope, so that the connecting rope is straightened. Then the connecting rope can drive the lower blade to swing upward. At this time, the binding line can be cut by the shearing force between the upper and lower blades. There is no need for the operator to manually pick up scissors to cut the binding line. This makes the semi-circular binding process of the sock toe more convenient and faster, and ultimately allows the operator to perform the semi-circular binding of the sock toe conveniently and accurately. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a partially enlarged view of the connection relationship between the worktable and the pressure plate in this invention;

[0034] Figure 3 This is a structural plan view of the workbench in this invention. At this time, the cylindrical iron block is embedded in the opening slot. The pressure plate, pressure foot, connecting rope located on the lower surface of the workbench and the unbound sock fabric are represented by dashed lines.

[0035] Figure 4 This is an enlarged view of the connection relationship between the slider and the cylindrical iron block in this invention;

[0036] Figure 5 This is a partially exploded view of the connection relationship between the pressure plate, the vertical sleeve, and the hand grip sleeve in this invention;

[0037] Figure 6 This is a cross-sectional view showing the connection relationship between the pressure plate, the vertical sleeve, and the hand grip sleeve in this invention;

[0038] Figure 7 This is a planar schematic diagram of the spiral guide groove after the vertical sleeve is unfolded in this invention, wherein the guide wheel is represented by a dashed line;

[0039] Figure 8 This is a flowchart of the workbench in various stages of the present invention, wherein the pressure plate, presser foot, and sock toe fabric are represented by dashed lines.

[0040] In the diagram, 1. Overlock sewing machine body; 11. Presser foot; 2. Worktable; 21. Long groove; 211. Limiting rod; 212. Connecting spring; 213. Opening groove; 22. Positioning plate; 221. Positioning arc plate; 222. Hinge arm; 3. Press plate; 31. Magnet sleeve; 4. Slider; 41. Cylindrical iron block; 411. Dovetail slide bar; 42. Waist-shaped hole; 43. Dovetail slide groove; 5. Pressing assembly; 51. Vertical sleeve; 511. Spiral guide groove; 52. Hand grip; 521. Anti-slip stripe; 522. Guide post; 5221. Guide wheel; 53. Return spring; 54. Push rod; 6. Cutting assembly; 61. Upper blade; 62. Lower blade; 63. First guide ring; 64. Fixed arm; 65. Second guide ring; 66. Third guide ring; 67. Through hole; 68. Connecting rope. Detailed Implementation

[0041] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] A high-speed overlock sewing machine, as described above Figure 1 , Figure 2 This high-speed overlock sewing machine includes a machine body 1, a presser foot 11, a worktable 2, and a pressure plate 3. The machine body 1 is driven by a high-speed motor, hence the name high-speed overlock sewing machine. The presser foot 11 is located on one side of the machine body 1, and the overlock sewing operation can be performed using the overlock thread. The worktable 2 is fixed to the machine body 1 at the position of the presser foot 11 by bolts. The pressure plate 3 is located on the upper side of the worktable 2, and the fabric can be pressed onto the upper surface of the worktable 2 by the pressure plate 3. An L-shaped positioning plate 22 for positioning the sock toe fabric is integrally provided on the side of the worktable 2 away from the presser foot 11. A semi-circular positioning arc plate 221 for the pressure plate 3 to pass through is provided on the upper side of the side of the positioning plate 22. A hinge arm 222 is welded to the outer wall of the middle part of the positioning arc plate 221 and is hinged to the positioning plate 22. The positioning plate 22 and the positioning arc plate 221 can position the pressure plate 3 on the sock toe fabric.

[0043] Reference Figure 2 , Figure 3 , Figure 4On the workbench 2, near the presser foot 11, there is a long groove 21 extending parallel to the side of the presser foot 11. One end of the long groove 21 is on the same horizontal line as the presser foot 11. A rectangular slider 4 is embedded in the long groove 21, with its sidewalls fitting against the sidewalls of the long groove 21. A cylindrical iron block 41 is provided at the upper end of the slider 4, and a dovetail groove 43 is provided on the upper surface of the slider 4. At the same time, the lower side of the cylindrical iron block 41, away from the presser foot 11, is integrally provided with a part embedded in the dovetail groove 43. The dovetail slide bar 411, and the end of the long groove 21 and the side near the presser foot 11 are provided with a U-shaped opening groove 213 for the cylindrical iron block 41 to be inserted; the slider 4 is provided with a waist-shaped hole 42 extending in the vertical direction, and a limiting rod 211 passing through the waist-shaped hole 42 is welded in the long groove 21. At the same time, a connecting spring 212 is also provided in the long groove 21 and sleeved on the limiting rod 211. One end of the connecting spring 212 is connected to the inner wall of the long groove 21 and the other end is pressed against the side wall of the slider 4.

[0044] Reference Figure 2 , Figure 5 , Figure 6 , Figure 7 A magnetic sleeve 31 is embedded in the center of the lower surface of the pressure plate 3 to attract the cylindrical iron block 41 after it is inserted. A gap is left between the magnetic sleeve 31 and the cylindrical iron block 41 for the fabric to be pressed in. The upper side of the pressure plate 3 is provided with a pressing component 5 for pushing the cylindrical iron block 41 downward into the elongated groove 21 after the hemming is completed. This pressing component 5 includes a vertical sleeve 51, a hand grip 52, a return spring 53, and a push rod 54. The vertical sleeve 51 is integrally set on the upper side of the pressure plate 3 and extends vertically upward. The hand grip 52 is fitted on the upper end of the vertical sleeve 51 for the operator to hold. The outer wall of the hand grip 52 is provided with anti-slip stripes 521. Spring 53 is disposed inside grip sleeve 52, and the lower end of return spring 53 abuts against vertical sleeve 51 and the upper end is bonded and fixed to the top of grip sleeve 52. The upper end of push rod 54 is bonded and fixed to the top of grip sleeve 52, and push rod 54 extends vertically upward and is embedded in vertical sleeve 51. At the same time, both sides of vertical sleeve 51 are provided with communicating spiral guide grooves 511, and guide post 522 embedded in spiral guide groove 511 is welded on the inner wall of grip sleeve 52. Guide post 522 is connected to guide wheel 5221 abutting against the inner wall of spiral guide groove 511 through bearing, and the upper and lower positions of the ends of spiral guide groove 511 are in a staggered distribution state.

[0045] Reference Figure 2 , Figure 3The workbench 2 is also equipped with a cutting assembly 6 that cuts the binding thread when the pressure plate 3 moves away from the presser foot 11. This cutting assembly 6 includes an upper blade 61, a lower blade 62, a first guide ring 63, a fixed arm 64, a second guide ring 65, a third guide ring 66, a through hole 67, and a connecting rope 68. The upper blade 61 is located on the side of the workbench 2 and is fixedly connected to the body 1 of the overlock sewing machine by bolts. The lower blade 62 is located below the upper blade 61 and one end is hinged to the lower side of the workbench 2. The first guide ring 63 is welded to the side of the upper blade 61, and the fixed arm 64 is welded to the workbench. 2. On the side near the lower blade 62, the second guide ring 65 is welded to the end of the fixed arm 64 away from the worktable 2, and the third guide ring 66 is welded to the lower surface of the worktable 2. At the same time, the through hole 67 is opened on the inner wall of the long groove 21 away from the slider 4 and communicates with the lower surface of the worktable 2. The connecting rope 68 is bonded and fixed to the side wall of the slider 4 at one end, and the other end passes through the through hole 67, the third guide ring 66, the second guide ring 65, and the first guide ring 63 in sequence before being bonded and fixed to the end of the lower blade 62 away from the worktable 2. The lower cutting edge of the upper blade 61 extends downward at an angle away from the worktable 2, while the upper cutting edge of the lower blade 62 extends upward at an angle away from the worktable 2 and intersects with the lower cutting edge of the upper blade 61.

[0046] Principle: When the toe fabric needs to be edged with a semi-circular arc, the positioning plate 22 and the positioning arc plate 221 are used to position the pressure plate 3 and the toe fabric, so that the pressure plate 3 accurately presses the toe fabric onto the upper surface of the worktable 2. Then, the pressure plate 3 is moved so that the toe fabric moves to the position of the long groove 21. Under the attraction of the magnetic sleeve 31, the slider 4 moves up and the cylindrical iron block 41 can be embedded in the magnetic sleeve 31 and attracted. Then, the pressure plate 3 drives the cylindrical iron block 41 to be embedded in the opening groove 213, and the toe fabric is ready to start the edge binding process. The cylindrical iron block 41 can be used to position the pressure plate 3 relative to the presser foot 11.

[0047] The operator then holds the grip sleeve 52 and presses it downwards. At this time, the vertical sleeve 51 has interconnected spiral guide grooves 511 on both sides, and the guide wheel 5221 on the grip sleeve 52 is embedded in the spiral guide grooves 511. As the operator presses the grip sleeve 52 downwards, the guide wheel 5221 rolls from the top to the bottom of the spiral guide groove 511. This causes the guide wheel 5221 to rotate the vertical sleeve 51 180 degrees, thus completing the semi-circular edge binding of the sock toe while pressing down on the grip sleeve 52. During the downward pressing process, the push rod 54 moves downward and abuts against the cylindrical iron block 41. At this time, the cylindrical iron block 41 can be pressed out of the magnet sleeve 31 by the push rod 54, so that the cylindrical iron block 41 and the slider 4 are pressed into the long groove 21. Although the cylindrical iron block 41 is removed from the magnet sleeve 31, the cylindrical iron block 41 and the magnet sleeve 31 still remain in the state of attraction. Then, the pressure plate 3 is moved to drive the cylindrical iron block 41 to move away from the opening groove 213. At this time, the side of the sock toe fabric can be separated from the presser foot 11, so as to prevent the side of the sock toe fabric after the semi-circular edge is completed from being pressed into the underside of the presser foot 11.

[0048] Then, the pressure plate 3 can be moved away from the pressure foot 11. Since the magnet sleeve 31 and the cylindrical iron block 41 are still in an attractive state, the slider 4 moves in the connecting groove, and the connecting spring 212 is compressed, so the connecting rope 68 can be in a relaxed state. Therefore, the lower blade 62 swings downward under its own weight. At this time, the space between the upper blade 61 and the lower blade 62 can be used for the binding line to pass through as the pressure plate 3 moves. At the same time, when the magnetic sleeve 31 and the cylindrical iron block 41 are released due to the movement of the pressure plate 3, the connecting spring 212... Under the action of elastic restoring force, slider 4 can move towards the side closer to presser foot 11. At this time, slider 4 can drive connecting rope 68, so that connecting rope 68 is straightened. Then connecting rope 68 can drive lower blade 62 to swing upward. At this time, the cutting operation of the binding line can be completed by the shearing force between upper blade 61 and lower blade 62. There is no need for the operator to manually pick up scissors to cut the binding line, so the semi-circular binding process of the entire sock toe is more convenient and faster. Finally, it is beneficial for the operator to perform semi-circular binding of the sock toe conveniently and accurately.

Claims

1. A high-speed overlock sewing machine, comprising an overlock sewing machine body (1), a presser foot (11) located on one side of the overlock sewing machine body (1), and a worktable (2) located at the presser foot (11), characterized in that: It also includes a pressure plate (3) for pressing the fabric onto the upper surface of the workbench (2). A long groove (21) with an extension direction parallel to the side of the pressure foot (11) is provided on the side of the workbench (2). A rectangular slider (4) with its sidewalls fitting against the sidewalls of the long groove (21) is provided in the long groove (21). A cylindrical iron block (41) is provided at the upper end of the slider (4). A pressure plate (3) is provided at the center of the lower surface of the pressure plate (3). A magnet sleeve (31) is provided for the cylindrical iron block (41) to be inserted and attracted. A pressing component (5) is provided on the upper side of the pressure plate (3) for pushing the cylindrical iron block (41) downward into the long groove (21) after the edge is finished. An oblong hole (42) extending vertically is provided on the slider (4). A limiting rod (211) passing through the oblong hole (42) is provided in the long groove (21). One end of the long groove (21) is connected to the press foot (11). The pressing assembly (5) is located on the same horizontal line. It includes a vertical sleeve (51) that is set on the upper side of the pressure plate (3) and extends vertically upward, a hand grip (52) that is fitted on the upper end of the vertical sleeve (51) and is held by the operator, a reset spring (53) that is set inside the hand grip (52) and whose lower end abuts against the vertical sleeve (51) and whose upper end is connected to the top of the hand grip (52), and a push rod (54) that is set inside the top of the hand grip (52) and extends vertically downward into the vertical sleeve (51). Both sides of the vertical sleeve (51) are provided with communicating spiral guide grooves (511). The inner wall of the hand grip (52) is provided with a guide post (522) embedded in the spiral guide groove (511). The guide post (522) is provided with a guide wheel (5221) that abuts against the inner wall of the spiral guide groove (511). The upper and lower positions of the ends of the spiral guide groove (511) are in a staggered distribution state.

2. The high-speed overlock sewing machine according to claim 1, characterized in that: The outer periphery of the hand grip (52) is provided with anti-slip stripes (521).

3. A high-speed overlock sewing machine according to claim 2, characterized in that: The long groove (21) is provided with a connecting spring (212) sleeved on the limiting rod (211). One end of the connecting spring (212) is connected to the inner wall of the long groove (21) and the other end is pressed against the side wall of the slider (4). The worktable (2) is provided with a cutting assembly (6) that cuts the edge line after the pressure plate (3) moves away from the pressure foot (11).

4. A high-speed overlock sewing machine according to claim 3, characterized in that: The upper surface of the slider (4) is provided with a dovetail groove (43), and the side of the cylindrical iron block (41) away from the presser foot (11) is provided with a dovetail slide rod (411) embedded in the dovetail groove (43). The end of the long groove (21) and the side near the presser foot (11) are provided with a U-shaped opening groove (213) for the cylindrical iron block (41) to be embedded.

5. A high-speed overlock sewing machine according to claim 4, characterized in that: The cutting assembly (6) includes an upper blade (61) located on the side of the worktable (2), a lower blade (62) located below the upper blade (61) and hinged at one end to the lower side of the worktable (2), a first guide ring (63) located on the side of the upper blade (61), a fixed arm (64) located on the side of the worktable (2) near the lower blade (62), a second guide ring (65) located at the end of the fixed arm (64), a third guide ring (66) located on the lower surface of the worktable (2), and an inner groove (66) formed at the end of the long slot (21) away from the slider (4). A through hole (67) on the wall and communicating with the lower surface of the workbench (2), a connecting rope (68) with one end connected to the side wall of the slider (4) and the other end passing through the through hole (67), the third guide ring (66), the second guide ring (65), and the first guide ring (63) in sequence and then connected to the end of the lower blade (62) away from the workbench (2), the lower blade of the upper blade (61) extends downwards at an angle away from the workbench (2), and the upper blade of the lower blade (62) extends upwards at an angle away from the workbench (2) and intersects with the lower blade of the upper blade (61).

6. A high-speed overlock sewing machine according to claim 1, characterized in that: A gap is left between the magnet sleeve (31) and the cylindrical iron block (41) for the fabric to be pressed in.

7. A high-speed overlock sewing machine according to claim 1, characterized in that: The workbench (2) is provided with an L-shaped positioning plate (22) for positioning the fabric on the side away from the presser foot (11).

8. A high-speed overlock sewing machine according to claim 7, characterized in that: The upper side of the positioning plate (22) is provided with a semi-circular arc-shaped positioning arc plate (221) through which the pressure plate (3) passes. The middle outer wall of the positioning arc plate (221) is provided with a hinge arm (222) hinged to the positioning plate (22).

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