Sewing machine thread puller

Abstract

The utility model discloses a thread puller of a sewing machine. The thread puller comprises a sewing machine head and a thread pulling structure. According to the thread puller of the sewing machine, by arranging the thread pulling structure, after the sewing machine stops sewing, the driving motor can drive the straight gear to rotate at the moment, the thread fixing assembly can be driven to move rightwards through meshing transmission of the straight gear and the straight rack, a thread can be pulled to move rightwards, and a long thread on a machine needle is shortened; the threaded column can be driven to rotate by rotating the rotary knob, the distance between the limiting block and the check block can be changed by utilizing spiral transmission of the threaded column and the nut seat, and when the limiting block moves to the check block, the thread hook and the connecting plate do not continue to move at the moment, so that the thread hook and the connecting plate do not continue to move. Therefore, the lengthened length of the sewing thread of the machine needle can be changed by adjusting the distance between the limiting block and the stop block, the pulled-out length of the sewing thread on the machine needle can be finely adjusted, and the problem that the sewing thread on the machine needle is pulled out is avoided.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a sewing machine thread puller. Background Technology

[0002] A sewing machine is a machine that uses one or more threads to create one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. Sewing machines can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products made of leather, plastic, and paper. The stitches produced are neat, beautiful, flat, and strong. Sewing machines are fast and easy to use.

[0003] Computerized flatbed sewing machines are an extension of traditional sewing machines. Their main feature is a digital control system that precisely controls needle movement and sewing speed, making sewing more precise and convenient. Ordinary computerized flatbed sewing machines typically produce tangled, bird's nest-like stitches when started, affecting the appearance and quality of the fabric. This is because after the automatic thread trimming during the previous stop, excessively long thread ends remain in the needle eye. When the machine restarts, the needle moves downwards, causing the thread to pierce the fabric, leaving these long ends underneath. During the subsequent sewing process, these long threads create bird's nest-like stitches on the fabric.

[0004] Chinese patent announcement number CN201056622Y discloses a sewing machine thread puller. This thread puller is located on the sewing machine head, between a small thread clamp nut and a thread clamp. The thread puller consists of a thread pull head on the sewing machine head and a drive device that allows the thread pull head to slide back and forth horizontally. A through hole for the sewing thread to pass through is provided on the thread pull head. The advantages of this sewing machine thread puller are that it prevents bird's nest-like stitches during sewing, achieving aesthetically pleasing stitches; it also features a simple overall structure, convenient operation, low manufacturing cost, and good operational stability.

[0005] While this device uses a drive mechanism to move the thread-carrying head horizontally, pulling back excess thread left in the sewing path to prevent bird's nest-like stitches when the sewing machine restarts, thus achieving neat stitches, it still has the following drawback: because the length of the thread pulled by the drive mechanism is not adjustable, the thread can easily be pulled out of the needle, requiring re-threading. To address these drawbacks, we propose a sewing machine thread puller. Utility Model Content

[0006] The purpose of this invention is to provide a sewing machine thread puller to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a sewing machine thread puller, comprising:

[0008] A sewing machine head, comprising a frame, and a thread take-up lever, a small thread clamp, a guide wheel, and a large thread clamp respectively disposed on the surface of the frame;

[0009] A thread-pulling structure, which is disposed on the front of the frame, includes a thread-fixing assembly and a drive assembly that can drive the thread-fixing assembly to move.

[0010] The suture fixing assembly includes a hook, a connecting plate fixedly installed on the right side of the hook, a buffer frame slidably installed on the surface of the connecting plate, and an adjusting component provided on the front of the connecting plate for adjusting the range of movement of the hook, and a buffer assembly is provided between the buffer frame and the connecting plate.

[0011] The adjusting components include a support frame fixedly mounted on the front of the connecting plate, a threaded column rotatably mounted on the inner wall of the support frame, a nut seat threadedly connected to the surface of the threaded column, a limit block fixedly mounted on the back of the nut seat, and a stop block fixedly mounted on the front of the frame.

[0012] Preferably, the front side of the connecting plate has a strip groove that allows the limiting block to slide.

[0013] Preferably, the right end of the threaded post extends to the outside of the support frame and is provided with a knob.

[0014] Preferably, the drive assembly includes a housing fixedly mounted on the front of the frame, a track groove formed on the left side of the housing, a rack slidably mounted on the inner wall of the track groove, a spur gear rotatably mounted on the inner wall of the housing, and a motor fixedly mounted on the front of the housing for driving the spur gear to rotate, wherein the left side of the rack is fixedly connected to the right side of the buffer frame.

[0015] Preferably, the spur gear meshes with the spur rack, and a limit plate is fixedly installed on the right side of the spur rack.

[0016] Preferably, the buffer assembly includes a groove formed on the upper and lower surfaces of the connecting plate, a guide rod fixedly installed on the inner wall of the groove, a slider slidably installed on the surface of the guide rod, and a compression spring sleeved on the surface of the guide rod, wherein the right side of the slider is fixedly connected to the left side of the buffer frame.

[0017] Preferably, one end of the compression spring overlaps with the right side of the slider, and the other end of the compression spring overlaps with the inner right side wall of the groove.

[0018] This sewing machine thread puller, through its thread-pulling structure, guides the thread through a small thread clamp, a large thread clamp, a thread hook, a thread take-up lever, and the needle. When the sewing machine stops, the drive motor rotates a spur gear. This gear meshes with a rack and pinion, moving the thread-fixing assembly to the right. This pulls the thread to the right, shortening any excess thread on the needle and preventing it from interfering with subsequent sewing. Rotating the knob rotates a threaded column, which, through a helical drive with a nut seat, changes the distance between the limit block and the stop block. When the limit block reaches the stop block position, the thread hook and connecting plate stop moving. Adjusting the distance between the limit block and the stop block changes the length of the thread pulled from the needle, allowing for fine-tuning of the pulled-out thread and preventing thread from being pulled out of the needle.

[0019] This sewing machine thread puller, by setting a buffer component, when the drive component drives the thread fixing component to move to the right and the limit block contacts the stop block, the drive component continues to work and drives the buffer frame to overcome the elastic force of the compression spring, thereby driving the slider to continue to move to the right along the trajectory of the guide rod. At this time, the thread hook and the connecting plate will not continue to move, thus protecting the motor and preventing it from burning out. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the front section of the drive structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of this utility model from below;

[0023] Figure 4 for Figure 1 Enlarged structural diagram at point A in the middle;

[0024] Figure 5 for Figure 2 Enlarged structural diagram at point B.

[0025] In the diagram: 1. Frame, 2. Wire take-up rod, 3. Small wire clamp, 4. Guide wheel, 5. Large wire clamp, 6. Wire hook, 7. Connecting plate, 8. Buffer frame, 9. Support frame, 10. Threaded post, 11. Nut seat, 12. Limiting block, 13. Stop block, 14. Strip groove, 15. Housing, 16. Straight rack, 17. Straight gear, 18. Motor, 19. Limiting plate, 20. Guide rod, 21. Slider, 22. Compression spring. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 This utility model provides a technical solution: a sewing machine thread puller, comprising: a sewing machine head and a thread pull structure.

[0028] The sewing machine head includes a frame 1, and a thread take-up lever 2, a small thread clamp 3, a guide wheel 4, and a large thread clamp 5 respectively disposed on the surface of the frame 1. The thread take-up lever 2, the small thread clamp 3, and the large thread clamp 5 are all existing technologies, so they will not be described in detail. The guide wheel 4 can guide the sewing thread between the small thread clamp 3 and the large thread clamp 5.

[0029] The thread-pulling structure is located on the front of the frame 1, and includes a thread-fixing assembly and a drive assembly that can move the thread-fixing assembly.

[0030] The thread fixing assembly includes a thread hook 6, a connecting plate 7 fixedly installed on the right side of the thread hook 6, a buffer frame 8 slidably installed on the surface of the connecting plate 7, and an adjustment component set on the front of the connecting plate 7 for adjusting the movement range of the thread hook 6. After the thread is passed through the small thread clamp 3, the large thread clamp 5, the thread hook 6, the thread take-up lever 2 and the needle, sewing can then be performed.

[0031] The drive assembly includes a housing 15 fixedly mounted on the front of the frame 1, a track groove formed on the left side of the housing 15, the track groove extending to the right side of the housing 15, a rack 16 slidably mounted on the inner wall of the track groove, a spur gear 17 rotatably mounted on the inner wall of the housing 15, and a motor 18 fixedly mounted on the front of the housing 15 for driving the spur gear 17 to rotate. The spur gear 17 meshes with the rack 16 for transmission, and the left side of the rack 16 is fixedly connected to the right side of the buffer frame 8. A limit plate 19 is fixedly mounted on the right side of the rack 16.

[0032] When the sewing machine stops sewing, the drive motor 18 rotates counterclockwise, which drives the spur gear 17 to rotate synchronously. The spur gear 17 meshes with the rack 16, which drives the buffer frame 8, connecting plate 7, and thread hook 6 to move to the right. The thread hook 6, moving to the right, pulls the thread to the right, shortening any longer thread on the needle. This prevents the longer thread on the needle from affecting the sewing machine's next sewing. When the sewing machine starts working again, the motor 18 rotates clockwise, which drives the buffer frame 8, connecting plate 7, and thread hook 6 to move to the left until they return to their original positions, preparing for the second thread pulling. When the rack 16 moves to the left until the limiting plate 19 contacts the outer casing 15, the rack 16 is limited, preventing it from detaching from the outer casing 15.

[0033] The adjusting components include a support frame 9 fixedly installed on the front of the connecting plate 7, a threaded column 10 rotatably installed on the inner wall of the support frame 9, a nut seat 11 threadedly connected to the surface of the threaded column 10, a limiting block 12 fixedly installed on the back of the nut seat 11, and a stop block 13 fixedly installed on the front of the frame 1. The front of the connecting plate 7 is provided with a strip groove 14 that allows the limiting block 12 to slide, and the stop block 13 is located on the right side of the limiting block 12.

[0034] The right end of the threaded post 10 extends to the outside of the support frame 9 and is equipped with a knob. Rotating the knob can drive the threaded post 10 to rotate. The threaded post 10 and the nut seat 11 are screwed together, which can drive the limit block 12 to slide along the inner wall of the strip groove 14, thereby changing the distance between the limit block 12 and the stop block 13.

[0035] A buffer assembly is provided between the buffer frame 8 and the connecting plate 7. The buffer assembly includes a slide groove formed on the upper and lower surfaces of the connecting plate 7, a guide rod 20 fixedly installed on the inner wall of the slide groove, a slider 21 slidably installed on the surface of the guide rod 20, and a compression spring 22 sleeved on the surface of the guide rod 20. The right side of the slider 21 is fixedly connected to the left side of the buffer frame 8, one end of the compression spring 22 overlaps with the right side of the slider 21, and the other end of the compression spring 22 overlaps with the inner right side wall of the slide groove.

[0036] When the drive assembly moves the connecting plate 7 and the hook 6 to the right until the limit block 12 moves to the position of the stop block 13, the hook 6 and the connecting plate 7 will not continue to move to the right due to the block block 13 blocking the limit block 12. Thus, the length of the needle thread can be changed by adjusting the distance between the limit block 12 and the stop block 13, thereby fine-tuning the length of the needle thread pulled out and avoiding the problem of the needle thread being pulled out excessively.

[0037] When the drive assembly drives the stitch fixing assembly to move to the right and the limit block 12 contacts the stop block 13, the drive assembly continues to work and drives the buffer frame 8 to overcome the elastic force of the compression spring 22, thereby driving the slider 21 to continue to move to the right along the trajectory of the guide rod 20. At this time, the hook 6 and the connecting plate 7 will not continue to move, thus protecting the motor 18 and preventing the motor 18 from burning out.

[0038] Working principle:

[0039] 1. After passing the thread through the small thread clamp 3, the large thread clamp 5, the thread hook 6, the thread take-up lever 2 and the needle, sewing can be started. When the sewing machine is working, the thread hook 6 on the thread pull structure is in the reset state. The thread hook 6 is between the large thread clamp 5 and the thread take-up lever 2, and the thread between the two is not bent.

[0040] 2. When the sewing machine stops sewing, the drive motor 18 rotates counterclockwise, which drives the spur gear 17 to rotate synchronously. The spur gear 17 meshes with the rack 16, which drives the rack 16 to move to the right along the track groove. At this time, the buffer frame 8, the connecting plate 7 and the thread hook 6 move to the right synchronously. The thread hook 6 moving to the right can pull the sewing thread inside the thread hook 6 to the right.

[0041] 3. When the drive assembly moves the connecting plate 7 and the hook 6 to the right until the limit block 12 moves to the position of the stop block 13, the hook 6 and the connecting plate 7 will not continue to move due to the block block 13 blocking the limit block 12. The drive assembly will continue to work and drive the buffer frame 8 to overcome the elastic force of the compression spring 22, thereby driving the slider 21 to continue to move to the right along the trajectory of the guide rod 20. On the one hand, the hook 6 can be used to make the thread partially bend, so that the longer thread on the needle is shortened, avoiding the longer thread on the needle from affecting the sewing machine to sew again. On the other hand, it can protect the motor 18 and prevent the motor 18 from burning out.

[0042] 4. When the sewing machine starts sewing again, the motor 18 rotates clockwise, which drives the buffer frame 8, the connecting plate 7 and the thread hook 6 to move to the left until they are reset, in preparation for pulling the sewing thread a second time.

[0043] 5. Rotating the knob can drive the threaded column 10 to rotate. The threaded column 10 and the nut seat 11 are screwed together, which can drive the limiting block 12 to slide along the inner wall of the strip groove 14. This can change the distance between the limiting block 12 and the stop block 13. By adjusting the distance between the limiting block 12 and the stop block 13, the length of the needle thread can be changed, and the length of the needle thread pulled out can be finely adjusted to avoid the problem of the needle thread being pulled out too much.

[0044] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sewing machine thread puller, characterized in that, include: The sewing machine head includes a frame (1) and a thread take-up lever (2), a small thread clamp (3), a guide wheel (4) and a large thread clamp (5) respectively disposed on the surface of the frame (1). A thread-pulling structure is disposed on the front side of the frame (1), which includes a thread-fixing assembly and a drive assembly that can drive the thread-fixing assembly to move. The suture fixing assembly includes a hook (6), a connecting plate (7) fixedly installed on the right side of the hook (6), a buffer frame (8) slidably installed on the surface of the connecting plate (7), and an adjustment component provided on the front of the connecting plate (7) for adjusting the range of movement of the hook (6), and a buffer assembly is provided between the buffer frame (8) and the connecting plate (7). The adjustment components include a support frame (9) fixedly installed on the front of the connecting plate (7), a threaded column (10) rotatably installed on the inner wall of the support frame (9), a nut seat (11) threadedly connected to the surface of the threaded column (10), a limit block (12) fixedly installed on the back of the nut seat (11), and a stop block (13) fixedly installed on the front of the frame (1).

2. The sewing machine thread puller according to claim 1, characterized in that: The front of the connecting plate (7) is provided with a strip groove (14) that allows the limiting block (12) to slide.

3. A sewing machine thread puller according to claim 1, characterized in that: The right end of the threaded post (10) extends to the outside of the support frame (9) and is provided with a knob.

4. A sewing machine thread puller according to claim 1, characterized in that: The drive assembly includes a housing (15) fixedly mounted on the front of the frame (1), a track groove opened on the left side of the housing (15), a rack (16) slidably mounted on the inner wall of the track groove, a spur gear (17) rotatably mounted on the inner wall of the housing (15), and a motor (18) fixedly mounted on the front of the housing (15) for driving the spur gear (17) to rotate, and the left side of the rack (16) is fixedly connected to the right side of the buffer frame (8).

5. A sewing machine thread puller according to claim 4, characterized in that: The spur gear (17) meshes with the rack (16) for transmission, and a limit plate (19) is fixedly installed on the right side of the rack (16).

6. A sewing machine thread puller according to claim 1, characterized in that: The buffer assembly includes a groove formed on the upper and lower surfaces of the connecting plate (7), a guide rod (20) fixedly installed on the inner wall of the groove, a slider (21) slidably installed on the surface of the guide rod (20), and a compression spring (22) sleeved on the surface of the guide rod (20), and the right side of the slider (21) is fixedly connected to the left side of the buffer frame (8).

7. A sewing machine thread puller according to claim 6, characterized in that: One end of the compression spring (22) overlaps with the right side of the slider (21), and the other end of the compression spring (22) overlaps with the inner right side wall of the groove.

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