A sewing machine cloth feeding auxiliary device capable of preventing cloth deviation

Abstract

This invention relates to the field of sewing machines and discloses a sewing machine feed auxiliary device to prevent fabric deviation. The device includes a base, a sewing machine support arm mounted on the base, and two parallel needle grooves along the feed direction at the lower end of the support arm. Each of the two needle grooves has a slidably connected needle assembly. A base box mechanism that cooperates with the two sets of needle assemblies is located within the base. An edge-binding assembly is positioned between the two sets of needle assemblies. Feeding assemblies are located on both sides of the needle and edge-binding assemblies. A recognition camera is positioned at the feed position of the sewing machine support arm. This invention effectively identifies the edge position of the fabric, ensuring uniform fabric sewing margins, preventing wrinkles during sewing, and improving the quality of the finished product's appearance.

Description

Technical Field

[0001] This invention relates to the field of sewing machines, and in particular to a sewing machine feed auxiliary device to prevent fabric deviation. Background Technology

[0002] Sewing machines, with their advantages of simple operation and low cost, have become the basic equipment for sewing fabrics and are widely used in clothing processing, textile production and other fields. Ordinary households can also use sewing machines to meet their needs for clothing repair. Although mainstream household sewing machines on the market can perform a variety of basic sewing processes and are suitable for sewing various fabrics such as cotton, linen and chemical fibers, they require a high degree of skill in manual alignment and fabric feeding from the operator. It is difficult for non-professional operators to achieve uniform and stable edge sewing.

[0003] Existing sewing machines have the following shortcomings when sewing fabric edges: First, most fabric edges lack reinforcement, resulting in loose fibers and poor tensile strength. During sewing, the tension of the thread is concentrated at the fabric edge, easily causing deformation and resulting in loose threads after sewing. Manual pre-sewing reinforcement is difficult to remove, easily scratching the fabric and affecting the finished product's appearance. Second, when sewing curved edges, manual alignment is insufficient, leading to inconsistent edge widths, fabric wrinkling, and curling, affecting the overall quality of the sewing. The flatness and appearance quality of the product; third, existing sewing machines generally adopt a feeding structure with feed dogs and presser feet. The feeding function relies on the point contact friction between the toothed structure of the feed dogs and the fabric. However, in the actual sewing process, the point contact friction can easily cause the fabric and feed dogs to slip relative to each other, which cannot limit the fabric from going off-center. This results in the final feeding displacement deviating from the preset distance, which makes the sewing edge of the fabric uneven. For fabric products or close-fitting clothing with high requirements for edge sewing precision, it is easy to cause overlock failure and unqualified finished product appearance, resulting in an increased defect rate and increased processing time and material costs. Summary of the Invention

[0004] The purpose of this invention is to provide a sewing machine feed assist device to prevent fabric deviation. It can identify the position of the fabric edge to ensure uniform fabric sewing margin, avoid wrinkles during the sewing process, and improve the quality of the finished product's sewing appearance.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a sewing machine feed auxiliary device for preventing fabric deviation, comprising a base, a sewing machine support arm disposed on the base, two parallel needle grooves being opened at the lower end of the sewing machine support arm along the feeding direction, a needle assembly being slidably connected in each of the two needle grooves, a base box mechanism being disposed in the base to cooperate with the two sets of needle assemblies, an edging assembly being disposed between the two sets of needle assemblies, a feed assembly being disposed on both sides of the needle assembly and the edging assembly, and a recognition camera being disposed at the feed position of the sewing machine support arm.

[0006] By adopting the above technical solution, the fabric enters from one side of the sewing machine and moves along a direction perpendicular to the needle groove under the drive of the fabric feeding component. The recognition camera intelligently identifies the edge position of the fabric, and the front needle component moves to the edge of the fabric for initial sewing based on the data from the recognition camera. The sewing thread provides support for the edge of the fabric to prevent the thread ends from becoming loose. The binding component identifies the position where the edge of the fabric needs to be folded, presses the folded part tightly and keeps the thickness consistent, and the rear needle component performs binding sewing on the folded edge of the fabric based on the data from the recognition camera.

[0007] A further embodiment of the present invention is that the needle assembly includes a needle base slidably connected in a needle groove, the needle base being driven to slide by a needle screw horizontally disposed in the needle groove, a needle rotation motor being disposed on the needle base in a vertical direction, a sewing needle being connected below the needle rotation motor, and the needle being coaxially disposed with the rotating part of the needle rotation motor.

[0008] By adopting the above technical solution, the needle screw drives the needle to move horizontally left and right within the needle groove. By recognizing the data from the camera, it is ensured that the needle moves accurately to the position where it needs to be inserted. When sewing the curved edge of the fabric, in order to ensure that the rotary hook in the lower base mechanism hooks the sewing thread passing through the needle, the orientation of the needle thread hole should be parallel to the tangent direction of the curved edge. The rotation direction of the needle is adjusted in real time by the needle rotation motor. At the same time, the coaxial setting of the needle and the rotating part of the needle rotation motor can ensure that the position of the needle does not change during the rotation process, thus avoiding the deviation of the sewing position.

[0009] A further configuration of the present invention is as follows: the bottom box mechanism includes a first bottom box assembly that cooperates with the front needle assembly and a second bottom box assembly that cooperates with the rear needle assembly. The first bottom box assembly is provided with a single-thread assembly, and the second bottom box assembly is provided with a double-thread assembly. The first bottom box assembly and the second bottom box assembly have the same structure.

[0010] A further configuration of the present invention is as follows: the first base box assembly includes a first bottom groove formed on the base and aligned with the needle slide groove at the front end; a first base is slidably disposed in the first bottom groove; the first base is driven to slide by a bottom groove screw disposed in the first bottom groove and parallel to the needle screw; a base box rotation motor is disposed on the first base and rotates along the vertical axis; the base box rotation motor rotates synchronously with the needle rotation motor; and a hook base that can cooperate with single-thread assembly and double-thread assembly is disposed above the base box rotation motor.

[0011] A further feature of the present invention is that the single-line assembly includes a single-line shuttle rotatably connected to the hook base, and a single-line shuttle motor is axially connected to one side of the single-line shuttle, the single-line shuttle motor being disposed on the side wall of the hook base.

[0012] A further feature of the present invention is that the double-thread assembly includes a double-thread shuttle rotatably connected to the hook base, a double-thread shuttle motor is axially connected to one side of the double-thread shuttle, the double-thread shuttle motor is disposed on the side wall of the hook base, and a bottom box sewing thread spool is rotatably connected inside the hook base.

[0013] By adopting the above technical solution, the bottom groove screw drives the first base to slide synchronously with the upper needle in the first bottom groove, and the bottom box rotation motor drives the hook base to rotate synchronously with the needle, thereby driving the rotary hook to rotate synchronously with the needle on the same axis, ensuring that the sewing thread of the needle can be hooked by the rotary hook.

[0014] A further configuration of the present invention is as follows: the binding assembly includes a binding groove formed at the lower end of the sewing machine arm, the binding groove being arranged parallel between two sets of needle grooves, a binding screw being rotatably arranged in the binding groove, a binding telescopic rod being connected to the binding screw, the binding telescopic rod including a telescopic main rod connected to the binding screw, and a telescopic secondary rod sleeved in the telescopic main rod and capable of sliding in the vertical direction, a telescopic threaded groove formed at the upper end of the telescopic secondary rod along the telescopic direction, a telescopic screw cooperating with the telescopic threaded groove being provided in the telescopic main rod, and a telescopic rod motor for driving the telescopic screw to rotate, and a folding assembly being provided at the lower end of the telescopic secondary rod.

[0015] By adopting the above technical solution, the edge binding telescopic rod moves to the edge of the fabric under the drive of the edge binding screw, and the telescopic auxiliary rod extends downward under the drive of the telescopic screw until it touches the fabric and presses the fabric. The fabric moves under the drive of the fabric feeding component, so that the edge of the fabric enters the folding component to complete the folding. The thickness of the folding of the fabric edge can be changed by changing the left and right positions of the edge binding component.

[0016] A further configuration of the present invention is as follows: the folding assembly includes a spiral guide fixed to the lower end of the telescopic auxiliary rod. The spiral guide is used to lift one side of the fabric and gradually bend the fabric along the spiral surface. Several sets of folding rollers rotatably connected to the lower end of the telescopic auxiliary rod are arranged on the side of the fabric away from the spiral surface of the spiral guide, and the edge of the folding roller is perpendicular to the spiral surface of the spiral guide.

[0017] By adopting the above technical solution, the fabric is tightly attached to the surface of the spiral guide and folded under the constraint of the spiral surface until the edge fabric is superimposed into two layers. During the folding process, the other side of the fabric is held by the folding roller to prevent it from shifting.

[0018] A further configuration of the present invention is as follows: the feeding assembly includes several sets of bidirectional lead screws rotatably disposed in the sewing machine arm in a vertical direction. The helical directions at both ends of the bidirectional lead screws are opposite. The plane in the middle of the bidirectional lead screw with the helical directions at both ends being opposite is flush with the upper surface of the base. Feeding rollers are symmetrically connected to both ends of the bidirectional lead screws. The feeding rollers can rotate in a direction parallel to the feeding direction. A feeding motor is axially connected to the feeding rollers. The feeding motor slides in a vertical direction in the sewing machine arm through a slot. The other end of the feeding roller is slidably connected to a slot at the end of the sewing machine arm.

[0019] By adopting the above technical solution, the upper and lower feed rollers move in opposite directions under the drive of the bidirectional screw. When the feed rollers are in contact, their contact surfaces are flush with the base surface, allowing the fabric to pass horizontally through the sewing machine without folding. Compared with conventional feed dog structures, the feed rollers have a larger contact area with the fabric surface, which can provide greater friction force to prevent the fabric from shifting. At the same time, the surface of the feed rollers is smooth, avoiding scratching the fabric.

[0020] A further feature of the present invention is that the needle assembly at the front end uses water-soluble thread when sewing.

[0021] By adopting the above technical solution, the sewn fabric can be washed with water to remove the initial stitches, making the finished product more beautiful.

[0022] The beneficial effects of this invention are:

[0023] 1. By recognizing the edge position of the fabric in real time through the camera, and adjusting the needle position and sewing path with the needle assembly that can slide along the needle groove, the fabric edge distance is ensured to be uniform and consistent, avoiding the problem of wrinkling and curling caused by edge distance deviation when sewing curved edges, and improving the flatness and appearance quality of the sewn products.

[0024] 2. By coordinating the synchronous rotation and sliding of the needle assembly and the base box mechanism, the positions of the needle and the rotary hook can be adjusted in real time during the arc-shaped sewing process. This ensures that the needle thread hole and the rotary hook hook position are always aligned, solving the problem of uneven thread tension caused by the mismatch between the needle speed and the fabric advance speed during arc-shaped sewing. This guarantees the stability and stitch accuracy of arc-shaped sewing.

[0025] 3. By using a recognition camera in conjunction with the spiral guide of the binding component, the fabric edge is folded over, while ensuring that the folded thickness is uniform. The folding roller clamps and limits the fabric to prevent it from springing back and spreading after folding. This solves the problems of uneven folding and easy arching and springing back in traditional binding processes, and further improves the quality of the finished product of overlock sewing.

[0026] 4. By driving the upper and lower feeding rollers with a bidirectional screw to clamp the fabric, the contact area between the feeding structure and the fabric is increased, and the feeding traction force is evenly distributed on the fabric surface. This avoids the scratches on the fabric surface caused by conventional feeding teeth, and solves the problem of relative slippage of the fabric that is prone to occur in traditional feeding structures. This ensures feeding accuracy and reduces the defect rate.

[0027] 5. By using water-soluble thread to pre-sew the fabric edges on the front needle assembly, the tensile strength of the fabric edges is improved in advance, avoiding the deformation of the fabric edges caused by the pulling of the sewing thread during the subsequent binding process. At the same time, the pre-sewn water-soluble thread can be directly dissolved and removed by water, without the need for manual removal of the thread, avoiding damage to the fabric caused by removing the thread and improving the appearance of the finished product. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the overall structure of a sewing machine feed auxiliary device for preventing fabric deviation, provided in an embodiment of the present invention.

[0030] Figure 2 This is a partial structural cross-sectional view of an embodiment of the present invention;

[0031] Figure 3 This is a partial structural cross-sectional view of an embodiment of the present invention;

[0032] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0033] Figure 5 This is a partial structural cross-sectional view of an embodiment of the present invention;

[0034] Figure 6 for Figure 5 Enlarged schematic diagram of part B.

[0035] In the diagram, 1. Base; 11. Sewing machine arm; 12. Needle groove; 2. Needle assembly; 21. Needle base; 22. Needle screw; 23. Needle; 24. Needle rotation motor; 3. Base box mechanism; 4. First base box assembly; 41. Single thread assembly; 411. Single thread shuttle; 412. Single thread shuttle motor; 42. First bottom groove; 43. First base; 44. Bottom groove screw; 45. Base box rotation motor; 5. Second base box assembly; 51. Double thread assembly; 511. Double thread shuttle; 512. 5. Double-thread rotary shuttle motor; 5.13. Bottom box sewing thread spool; 6. Hemming assembly; 6.1. Hemming slide; 6.2. Hemming lead screw; 6.3. Hemming telescopic rod; 6.31. Telescopic main rod; 6.32. Telescopic secondary rod; 6.33. Telescopic threaded groove; 6.34. Telescopic screw; 6.35. Telescopic rod motor; 6.4. Folding assembly; 6.41. Spiral guide; 6.42. Folding roller; 7. Fabric feeding assembly; 7.1. Two-way lead screw; 7.2. Fabric feeding roller; 7.3. Fabric feeding motor; 8. Recognition camera; 9. Hook base. Detailed Implementation

[0036] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0037] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. 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.

[0038] Example: Figure 1As shown in the figure, this embodiment provides a sewing machine feeding auxiliary device to prevent fabric deviation, including a base 1, on which a sewing machine support arm 11 is installed. The sewing machine support arm 11 is composed of a vertical column and a horizontally extending support arm. The lower end of the sewing machine support arm 11 has two parallel needle grooves 12 along the feeding direction. Each of the two needle grooves 12 is slidably connected to a needle assembly 2. The base 1 is equipped with a base box mechanism 3 that cooperates with the two sets of needle assemblies 2 respectively. An edge binding assembly 6 is provided between the two sets of needle assemblies 2. A feeding assembly 7 is provided on both sides of the needle assembly 2 and the edge binding assembly 6. A recognition camera 8 is provided at the feeding position of the sewing machine support arm 11.

[0039] Most fabrics require cutting and edge sewing to prevent loosening due to exposed threads. Since the edges of cut fabric have poor tensile strength, direct sewing can easily cause threads to unravel, damaging the fabric. Therefore, this invention installs two sets of needle assemblies 2. When the fabric enters, the edge position is first intelligently identified by the recognition camera 8. The front needle assembly 2 performs an initial edge sewing on the inside of the fabric to reinforce its edge strength. Then, the fabric edge is folded over by the binding assembly 6, and the rear needle assembly 2 sews the folded double-layered fabric tightly to prevent threads from coming out. Since the stitching of the front needle assembly 2 is located on the inside of the fabric, this stitching needs to be removed for a more aesthetically pleasing finished product. Therefore, the front needle assembly 2... The lower box mechanism 3, which works in conjunction with it, uses existing single-thread sewing needles and single-thread hooks. When it is necessary to remove the sewing thread, it is only necessary to untie the slip knot at the end to pull out the entire thread. The rear needle assembly 2 and the lower box mechanism 3, which work in conjunction with it, need to fix the edge of the fabric. Therefore, a double-thread hook is installed in the lower box mechanism 3, and a lower box is installed to achieve double-thread sewing. It should be noted that the recognition camera 8 can adopt existing mature camera intelligent recognition technology solutions. Its specific structure and process are not within the scope of protection of this invention and will not be described in detail here. At the same time, the pedal and other conventional necessary structures used to ensure the basic operation of the sewing machine are all existing mature components. Since this invention does not modify or optimize the above conventional structures, their specific structures are not listed here.

[0040] Because friction can cause the fabric displacement to be inconsistent with the sewing stitch length during the conventional fabric feeding process, especially when sewing curved fabric edges, this can easily lead to uneven fabric edge thickness and wrinkling. Therefore, this invention uses the fabric feeding assembly 7 to make the fabric pass through two sets of needle assemblies 2 in a fixed direction. After the recognition camera 8 identifies the fabric edge, the needle assembly 2 slides in the needle groove 12 until it reaches the edge position. Then, by adjusting the left and right movement speed of the needle assembly 2 and the fabric transport speed of the fabric feeding assembly 7, the sewing stitch length and the fabric forward speed are matched to avoid edge wrinkling.

[0041] Compared to conventional feed dog structures, the feed assembly 7 has a larger contact area with the fabric surface, which allows the force it provides to advance the fabric to be more evenly distributed throughout the fabric, reducing the force per unit area and thus preventing damage to the fabric. At the same time, providing forward force to the fabric from multiple positions also reduces the relative friction between the feed assembly and the fabric, making sewing more accurate.

[0042] The needle assembly 2 includes a needle base 21 slidably connected in the needle groove 12. The needle base 21 is driven to slide by a needle screw 22 horizontally arranged in the needle groove 12. A needle rotation motor 24 is arranged vertically on the needle base 21. A sewing needle 23 is connected below the needle rotation motor 24. The needle 23 is coaxially arranged with the rotating part of the needle rotation motor 24.

[0043] When the curved edge of the fabric enters the needle assembly 2 below the sewing machine along the feeding direction, the needle assembly 2 is driven to the curved edge by the needle screw 22 according to the data of the recognition camera 8. Then, the needle rotation motor 24 drives the needle 23 below to rotate until the direction of the needle hole is parallel to the tangent of the curved edge of the fabric at that position. Then the needle 23 starts sewing again. It should be noted that the needle 23 of the present invention includes all the structures and conventional presser feet required by existing mature sewing machines to realize the up and down movement of the needle. In the present invention, the presser foot is only used as a component to press the fabric and prevent it from shifting during the sewing process. The present invention does not use the traditional feeding method of feeding the fabric by combining the feed dog with the presser foot. The power source for the movement of the needle can be installed on the needle base by conventional technical solutions in the field and slides left and right together with the needle 23 under the drive of the needle screw 22. The power source drives the needle 23 to realize the up and down movement function through a conventional linkage structure. The specific linkage and other parts are not described in detail here.

[0044] Furthermore, the bottom box mechanism 3 includes a first bottom box assembly 4 that cooperates with the front needle assembly 2 and a second bottom box assembly 5 that cooperates with the rear needle assembly 2. The first bottom box assembly 4 is provided with a single thread assembly 41, and the second bottom box assembly 5 is provided with a double thread assembly 51. The first bottom box assembly 4 and the second bottom box assembly 5 have the same structure.

[0045] In implementation, the first base box assembly 4 includes a first bottom groove 42 formed on the base 1 and aligned with the needle slide groove 12 at the front end. A first base 43 is slidably disposed in the first bottom groove 42. The first base 43 is driven to slide by a bottom groove screw 44 disposed in the first bottom groove 42 and parallel to the needle screw 22. A base box rotation motor 45 is disposed on the first base 43 and rotates along the vertical axis. The base box rotation motor 45 rotates synchronously with the needle rotation motor 24. A hook base 9 that can cooperate with the single thread assembly 41 and the double thread assembly 51 is disposed above the base box rotation motor 45.

[0046] As the sewing machine needle 23 descends and pierces the fabric, the thread is stretched and deformed by the friction of the fabric and forms a loop. The loop is held by the hook below, thus completing the interlacing of the upper and lower threads. In order to ensure the formation of the loop, the relative angle between the needle hole and the bottom hook must be fixed and the two positions must not be offset. Therefore, the first base 43 is driven by the bottom groove screw 44 and slides synchronously with the corresponding needle assembly 2 in the first bottom groove 42.

[0047] When sewing the edge of curved fabric, this device needs to drive the needle assembly 2 to slide along the curved fabric edge. In order to match the curved trajectory and ensure the stability of the puncture direction, the needle 23 needs to rotate and adjust its posture in real time during the sliding process so that its needle body is always parallel to the tangent of the curved fabric edge. Since the hooking action of the needle and the hook and shuttle depends on a constant relative angle, this invention, based on the rotation of the needle 23 along the curved line, drives the hook base 9 installed above to rotate horizontally synchronously with the needle assembly 2 through the rotating motor 45 of the bottom box, maintaining a constant angle between the needle thread hole and the hook and shuttle, ensuring stable hooking action during curved sewing, and improving the accuracy of sewing curved fabric edges.

[0048] To facilitate the removal of the initial sewing thread, a single-thread assembly 41 is provided, including a single-thread rotary hook 411 rotatably connected to the hook base 9. A single-thread rotary hook motor 412 is axially connected to one side of the single-thread rotary hook 411. The single-thread rotary hook motor 412 is mounted on the side wall of the hook base 9 and rotates together with the hook base 9. The single-thread rotary hook motor 412 can drive the single-thread rotary hook 411 to rotate to complete the hooking process. The stitch sewn by the single-thread rotary hook motor 412 is a single-thread stitch. The entire thread can be pulled out by pulling one end. The single-thread rotary hook motor 412 and the needle rotation motor 24 are preferably servo motors, which can precisely control the rotation angle.

[0049] To ensure a more secure stitch at the edge of the rolled-up fabric, a double-thread assembly 51 is provided, including a double-thread shuttle 511 rotatably connected to the hook base 9. A double-thread shuttle motor 512 is axially connected to one side of the double-thread shuttle 511. The double-thread shuttle motor 512 is mounted on the side wall of the hook base 9. A bottom box sewing thread spool 513 is rotatably connected inside the hook base 9. The double-thread shuttle 511 is driven to rotate by the double-thread shuttle motor 512, which in turn drives the bottom box thread wound inside the connected bottom box sewing thread spool 513 to interweave with the thread pierced by the needle 23 above to form a double-thread sewing stitch. This stitch is more difficult to pull out. The double-thread shuttle motor 512 is preferably a servo motor so as to cooperate with the needle rotation motor 24 for rotation.

[0050] Furthermore, the binding assembly 6 includes a binding groove 61 located at the lower end of the sewing machine arm 11. The binding groove 61 is arranged parallel between two sets of needle grooves 12. A binding screw 62 is rotatably mounted inside the binding groove 61. A binding telescopic rod 63 is connected to the binding screw 62. The binding telescopic rod 63 includes a telescopic main rod 631 connected to the binding screw 62 and a telescopic secondary rod 632 that is sleeved inside the telescopic main rod 631 and can slide vertically. A telescopic threaded groove 633 is provided at the upper end of the telescopic secondary rod 632 along the telescopic direction. A telescopic screw 634 that cooperates with the telescopic threaded groove 633 is provided inside the telescopic main rod 631, and a telescopic rod motor 635 that drives the telescopic screw 634 to rotate is provided. A folding assembly 64 is provided at the lower end of the telescopic secondary rod 632.

[0051] To fold the fabric edge and maintain a consistent fold thickness, a binding groove 61 is provided below the horizontal arm of the sewing machine support arm 11. The telescopic main rod 631 is driven by the binding screw 62 installed in the binding groove 61 to slide in a direction parallel to the movement of the needle assembly 2. When the fabric enters the sewing machine from the feed port, the telescopic main rod 631 slides above the edge of the fabric and then drives the telescopic screw 634 to rotate via the telescopic rod motor 635. Since the telescopic auxiliary rod 632 is stuck by conventional slots and other structures and cannot rotate, it slides downward under the drive of the telescopic screw 634 until the lower end of the telescopic auxiliary rod 632 touches the plane of the base 1. Then, the front end of the fabric enters the folding assembly 64 under the drive of the fabric feeding assembly 7 to achieve edge folding.

[0052] Furthermore, the folding assembly 64 includes a spiral guide 641 fixed to the lower end of the telescopic auxiliary rod 632. The spiral guide 641 is used to lift one side of the fabric and gradually bend the fabric along the spiral surface. Several sets of folding rollers 642 rotatably connected to the lower end of the telescopic auxiliary rod 632 are arranged on the side of the fabric away from the spiral surface of the spiral guide 641, and the edge of the folding roller 642 is perpendicular to the spiral surface of the spiral guide 641.

[0053] When the fabric enters, the edge is located at the position where the front end of the spiral guide 641 is in contact with the upper surface of the base 1. The spiral guide 641 lifts the flat fabric and gradually bends it. At the same time, multiple sets of folding rollers 642 are rotatably connected to the side of the fabric away from the working surface of the spiral guide 641. When the folding rollers 642 rotate, the rims of the rollers 642 are constantly pressed against the working surface of the spiral guide 641. The folding rollers 642 and the spiral guide 641 are respectively set on both sides of the fabric for clamping. Under the action of the fabric feeding assembly 7, the fabric is pulled forward, so that the edge fabric is continuously folded. The fabric folded into two layers continues to be pressed down by the folding rollers 642 at the rear to prevent it from spreading out, until the needle assembly 2 at the rear end sews the two layers of fabric together.

[0054] In practice, the fabric feeding assembly 7 includes several sets of bidirectional lead screws 71 that are rotatably arranged in the sewing machine arm 11 in a vertical direction. The helical directions at both ends of the bidirectional lead screw 71 are opposite. The plane in the middle of the bidirectional lead screw 71 with the opposite helical directions at both ends is flush with the upper surface of the base 1. The two ends of the bidirectional lead screw 71 are symmetrically connected to fabric feeding rollers 72. The fabric feeding rollers 72 can rotate in a direction parallel to the feeding direction. The fabric feeding rollers 72 are axially connected to a fabric feeding motor 73. The fabric feeding motor 73 slides in the sewing machine arm 11 in a vertical direction through a slot. The other end of the fabric feeding roller 72 is slidably connected in a slot at the end of the sewing machine arm 11.

[0055] The two ends of the bidirectional lead screw 71 have opposite spiral directions. When the lead screw rotates, the feed rollers 72 connected to the upper and lower parts of the bidirectional lead screw 71 move up and down in opposite directions. When the feed rollers 72 are in contact, their contact plane is flush with the upper surface of the base 1. The fabric is subjected to the squeezing force of the upper and lower feed rollers 72 and cannot deviate horizontally. At the same time, the feed rollers 72 are axially connected to the feed motor 73. The feed motor 73 is slidably connected to the vertical column of the sewing machine arm 11 through conventional slots and other means, and moves up and down with the feed rollers 72. Since the contact area between the feed rollers 72 and the fabric surface is larger than that of conventional feed teeth, and the surface of the feed rollers 72 is smooth and does not have the serrated structure of feed teeth, the fabric surface can be prevented from being scratched during the process of driving the fabric to move by the feed rollers 72. At the same time, the feed rollers 72 also distribute the applied squeezing force evenly on the fabric surface, further reducing the deviation of the fabric.

[0056] To further avoid damage to the fabric when removing the sewing thread from the front needle assembly 2, water-soluble thread is used during the initial sewing. Water-soluble thread is a mature existing technology that dissolves directly in room temperature water. Therefore, the pre-sewn thread can be removed by rinsing the sewn fabric with water without affecting the fabric.

[0057] The above description shows and illustrates the basic principles, main features, and advantages of the present invention. Standard parts used in the present invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment adopt conventional models in the prior art, which will not be described in detail here.

[0058] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sewing machine feed assist device for preventing fabric deviation, comprising a base (1), wherein a sewing machine support arm (11) is provided on the base (1), characterized in that: The sewing machine arm (11) has two parallel needle grooves (12) at its lower end along the feeding direction. Each of the two needle grooves (12) is slidably connected to a needle assembly (2). The base (1) is provided with a base box mechanism (3) that cooperates with the two sets of needle assemblies (2). An edge binding assembly (6) is provided between the two sets of needle assemblies (2). A fabric feeding assembly (7) is provided on both sides of the needle assembly (2) and the edge binding assembly (6). An identification camera (8) is provided at the feeding position of the sewing machine arm (11).

2. The sewing machine feed auxiliary device for preventing fabric deviation according to claim 1, characterized in that: The needle assembly (2) includes a needle base (21) slidably connected in the needle groove (12). The needle base (21) is driven to slide by a needle screw (22) horizontally arranged in the needle groove (12). A needle rotating motor (24) is arranged vertically on the needle base (21). A sewing needle (23) is connected below the needle rotating motor (24). The needle (23) is coaxially arranged with the rotating part of the needle rotating motor (24).

3. The sewing machine feed auxiliary device for preventing fabric deviation according to claim 2, characterized in that: The bottom box mechanism (3) includes a first bottom box assembly (4) that cooperates with the front needle assembly (2) and a second bottom box assembly (5) that cooperates with the rear needle assembly (2). The first bottom box assembly (4) is provided with a single thread assembly (41), and the second bottom box assembly (5) is provided with a double thread assembly (51). The first bottom box assembly (4) and the second bottom box assembly (5) have the same structure.

4. A sewing machine feed auxiliary device for preventing fabric deviation according to claim 3, characterized in that: The first base box assembly (4) includes a first bottom groove (42) opened on the base (1) and aligned with the needle slide groove (12) at the front end. A first base (43) is slidably disposed in the first bottom groove (42). The first base (43) is driven to slide by a bottom groove screw (44) disposed in the first bottom groove (42) and parallel to the needle screw (22). A base box rotation motor (45) that rotates along the vertical axis is disposed on the first base (43). The base box rotation motor (45) rotates synchronously with the needle rotation motor (24). A hook base (9) that can cooperate with the single thread assembly (41) and the double thread assembly (51) is disposed above the base box rotation motor (45).

5. A sewing machine feed auxiliary device for preventing fabric deviation according to claim 4, characterized in that: The single-line assembly (41) includes a single-line shuttle (411) rotatably connected to the hook base (9), and a single-line shuttle motor (412) is axially connected to one side of the single-line shuttle (411). The single-line shuttle motor (412) is disposed on the side wall of the hook base (9).

6. A sewing machine feed auxiliary device for preventing fabric deviation according to claim 5, characterized in that: The double-line assembly (51) includes a double-line shuttle (511) rotatably connected to the hook base (9). A double-line shuttle motor (512) is axially connected to one side of the double-line shuttle (511). The double-line shuttle motor (512) is disposed on the side wall of the hook base (9). A bottom box sewing thread spool (513) is rotatably connected inside the hook base (9).

7. A sewing machine feed auxiliary device for preventing fabric deviation according to claim 1, characterized in that: The binding assembly (6) includes a binding groove (61) formed at the lower end of the sewing machine arm (11). The binding groove (61) is arranged parallel between the two sets of needle grooves (12). A binding screw (62) is rotatably mounted in the binding groove (61). A binding telescopic rod (63) is connected to the binding screw (62). The binding telescopic rod (63) includes a telescopic main rod (631) connected to the binding screw (62) and a sleeved... A telescopic auxiliary rod (632) that can slide vertically inside the telescopic main rod (631) is provided. The upper end of the telescopic auxiliary rod (632) is provided with a telescopic threaded groove (633) along the telescopic direction. The telescopic main rod (631) is provided with a telescopic screw (634) that cooperates with the telescopic threaded groove (633), and a telescopic rod motor (635) that drives the telescopic screw (634) to rotate. The lower end of the telescopic auxiliary rod (632) is provided with a folding assembly (64).

8. A sewing machine feed auxiliary device for preventing fabric deviation according to claim 1, characterized in that: The folding assembly (64) includes a spiral guide (641) fixed to the lower end of the telescopic auxiliary rod (632). The spiral guide (641) is used to lift one side of the fabric and make the fabric gradually bend along the spiral surface. Several sets of folding rollers (642) rotatably connected to the lower end of the telescopic auxiliary rod (632) are arranged on the side of the fabric away from the spiral surface of the spiral guide (641), and the edge of the folding roller (642) is perpendicular to the spiral surface of the spiral guide (641).

9. A sewing machine feed auxiliary device for preventing fabric deviation according to claim 8, characterized in that: The feeding assembly (7) includes several sets of bidirectional screws (71) that are rotatably arranged in the sewing machine arm (11) in the vertical direction. The two ends of the bidirectional screws (71) have opposite helical directions. The middle part of the bidirectional screws (71) is flush with the upper surface of the base (1). The two ends of the bidirectional screws (71) are symmetrically connected to feeding rollers (72). The feeding rollers (72) can rotate in a direction parallel to the feeding direction. The feeding rollers (72) are axially connected to a feeding motor (73). The feeding motor (73) slides in the sewing machine arm (11) in the vertical direction through a slot. The other end of the feeding rollers (72) is slidably connected in the slot at the end of the sewing machine arm (11).

10. A sewing machine feed assist device for preventing fabric deviation according to claim 1, characterized in that: The needle assembly (2) at the front end uses water-soluble thread when sewing.

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