A sewing machine device that prevents bird's nests from forming at the start of a stitch and produces short thread ends at the finish.

Abstract

This utility model discloses a device for sewing machines that prevents bird's nests at the start of a stitch and produces short thread ends, relating to the field of sewing machine accessories technology. The utility model includes: a main board, a mounting vertical plate, a top plate, and a swing arm. A mounting sleeve is fixedly connected to the surface of the main board, and a cylinder is fixedly installed inside the mounting sleeve. This utility model, through a main board as the basic load-bearing structure, combined with the rigid support of the triangular mounting vertical plate and the centralized layout advantages of the top plate, provides a stable and compact mounting frame for various functional components (such as cylinders, swing arms, and traction rods). This enhances the overall structural reliability, improves space utilization, and facilitates maintenance and debugging. The optimized design of key transmission and drive components effectively ensures operational accuracy and efficiency: the rotating plate forms a two-end force-bearing structure with the traction rod through the clamps at both ends, and the pre-tension force and auxiliary reset function of the tension spring ensure a tight drive connection between the clamps and the cylinder.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewing machine accessories. Specifically, it relates to a device for sewing machines that prevents bird's nests at the start of a stitch and produces short thread ends at the end. Background Technology

[0002] In the sewing machine processing, the quality of thread end fixing at the starting stage and the effect of thread end treatment at the finishing stage directly affect the appearance quality of the finished garment and production efficiency. In traditional sewing machines, if the thread end is not effectively fixed at the starting stage, it often becomes loose and tangled, forming a "bird's nest"-like ball of thread due to vibrations at machine startup, fluctuations in thread tension, or interference from needle bar movement. This not only requires manual cleaning but can also cause thread breakage, skipped stitches, and other malfunctions, reducing production continuity. Similarly, at the finishing stage, thread end melting and finishing present challenges. Traditional melting devices often use a single heating element or a fixed-position cutter, which often results in uneven heating, misaligned melting points, or insecure thread clamping, leading to excessively long thread residue (requiring secondary trimming) or incomplete melting (loose thread), severely affecting the finished product's appearance and processing efficiency.

[0003] Furthermore, the mechanical structure design of existing thread end processing devices has limitations: drive components (such as cylinders and transmission rods) are mostly distributed, resulting in long power transmission paths that are easily affected by spatial interference, leading to poor synchronization of actions and difficulty in accurately matching the timing requirements of starting and ending stitches; the connection methods of key execution components (such as thread clamping mechanisms and fuse components) are mostly rigidly fixed, lacking buffering and reset mechanisms, which are prone to wear or jamming due to impact loads during frequent reciprocating actions, reducing the reliability of the device; moreover, some devices have not optimized the structural rigidity and heat conduction efficiency for the dynamic clamping and fusing requirements of thread ends. For example, insufficient support rigidity of the thread clamping mechanism may cause the thread end to slip, and an excessively long distance between the heating element and the fuse head of the fuse component will increase energy loss and affect the temperature control accuracy, further exacerbating the instability of the thread end processing effect.

[0004] In view of this, this utility model is proposed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a device for sewing machines that prevents bird's nests from starting the stitch and produces short thread ends, thus solving the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A device for sewing machines that prevents nesting at the start of a stitch and produces short thread ends includes: a main board, a mounting plate, a top plate, and a swing arm. A mounting sleeve is fixedly connected to the surface of the main board. A cylinder is fixedly installed inside the mounting sleeve. A lock head is fixedly connected to the output shaft end of the cylinder, and a hook clamp rod is fixedly connected to the lock head. The mounting plate is fixedly connected to the bottom end of the mounting sleeve. A traction rod is fixedly connected to one end of the mounting plate near the lock head. The mounting plate is triangular in shape. A rotating plate and a guard chip are rotatably connected to the inclined sides of the bottom end of the mounting plate. One end of the hook clamp rod is located at the guard chip. The swing arm is rotatably connected to one side surface of the mounting sleeve. The top plate is fixedly connected to the top of the main board by bolts. A mounting plate is fixedly connected to one side of the top of the top plate. A cylinder two and a cylinder three are fixedly connected to the upper surface of the mounting plate.

[0008] Optionally, a clamp is fixedly connected to the bottom end of the rotating plate, the clamp is engaged with the surface of the hook clamp rod, and the output end of the cylinder extends through the surface of the main board to the back of the main board.

[0009] Optionally, the clamping head is located at one end of the rotating plate, the traction rod is located at the other end of the rotating plate, the top end of the traction rod is fixedly connected to the clamping head, and the bottom end of the second cylinder is clamped to the clamping head.

[0010] Optionally, a tension spring is hooked onto one side of the snap-fit ​​connector, and the top end of the tension spring is hooked onto the surface of the mounting plate.

[0011] Optionally, a fuse head is fixedly connected to one end of the swing arm, and a pressure plate is fixedly connected to the other end of the swing arm. The fuse head corresponds to the position of the protective chip, and the pressure plate corresponds to the bottom end of the cylinder three. A tension spring two is hooked on the edge of the pressure plate, and the top end of the tension spring two is hooked on the edge of the mounting plate.

[0012] Optionally, a heating wire is wound around the swing arm near the fuse head, and a wire is fixedly connected to the heating wire.

[0013] Optionally, a limiting block is fixedly connected to the side of the mounting sleeve, and the limiting block is located directly below the swing arm.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0015] By using a mainboard as the base load-bearing structure, combined with the rigid support of the triangular mounting vertical plate and the centralized layout advantages of the top plate, a stable and compact mounting frame is provided for various functional components (such as cylinders, swing arms, and traction rods). This enhances the overall structural reliability, improves space utilization, and facilitates maintenance and debugging. The optimized design of key transmission and drive components effectively ensures the accuracy and efficiency of the operation: the rotating plate forms a force-bearing structure at both ends through the clamps and traction rods at both ends. With the preload and auxiliary reset function of the tension spring one, it ensures a tight drive connection between the clamps and cylinder two, avoiding drive failure caused by vibration or loosening. It also balances the torque of the rotating plate, reduces movement deviation or jamming, and improves the smoothness of the rotating plate's rotation. The layout of cylinder one's output shaft running through the mainboard optimizes the power transmission path, shortens the effective stroke, and avoids interference, further improving drive efficiency. This makes the clamping action of the hook clamp on the textile thread faster and more precise, through precise positioning and power... The integrated design achieves the goals of eliminating "bird's nest" (a metaphor for incomplete stitching) and minimizing thread ends: the fuse head at one end of the swing arm precisely aligns with the protective chip, and the short-range heating design of the wound heating wire and stable power supply shorten the heat transfer path, improve heating efficiency and temperature control accuracy, ensure reliable thread end melting, and prevent accidental contact with other components; the pressure plate at the other end achieves flexible control of pressing and releasing through the cooperation of cylinder three and tension spring two, and the limit block of the swing arm restricts the swing amplitude, preventing collision damage caused by excessive swinging, and providing a clear positional reference for actions such as melting and pressing, ensuring the continuity of process connections. The elastic reset function of tension spring one and tension spring two shortens the action cycle time. Combined with the dynamic snap-fit ​​and linkage design of each component, modular integration of starting and ending sewing operations is achieved, significantly improving overall coordination and reliability, effectively reducing manual intervention, lowering the failure rate, and greatly improving the production efficiency and product quality of the sewing machine's starting and ending sewing processes.

[0016] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0018] Figure 1 A schematic diagram of the overall structure of a device for sewing machines that prevents bird's nests from starting the stitch and produces short thread ends;

[0019] Figure 2 This is a schematic diagram of the swing arm structure;

[0020] Figure 3 A schematic diagram of the installation of the vertical plate structure;

[0021] Figure 4 for Figure 3Another perspective structural diagram.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 100. Mainboard; 101. Mounting sleeve; 102. Cylinder 1; 103. Lock head; 104. Hook clamp rod;

[0024] 200. Mounting plate; 201. Rotating plate; 202. Clip; 203. Traction rod; 204. Clip connector; 205. Protective chip; 206. Tension spring one;

[0025] 300. Top plate; 301. Mounting plate; 302. Cylinder 2; 303. Cylinder 3;

[0026] 400. Swing arm; 401. Pressure plate; 402. Tension spring II; 403. Fuse; 404. Heating wire; 405. Wire;

[0027] 500, limit block.

[0028] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings.

[0030] Please see Figure 1-4 As shown, this embodiment provides a sewing machine device for starting a stitch without a bird's nest and ending with a short thread end, including: a main board 100, a mounting vertical plate 200, a top plate 300, and a swing arm 400. A mounting sleeve 101 is fixedly connected to the surface of the main board 100. A cylinder 102 is fixedly installed inside the mounting sleeve 101. A locking head 103 is fixedly connected to the output shaft end of the cylinder 102. A hook clamp 104 is fixedly connected to the locking head 103. The mounting vertical plate 200 is fixedly connected to the bottom end of the mounting sleeve 101. A hook clamp 104 is fixedly connected to the mounting vertical plate 200 near the locking head 103. One end of 03 is fixedly connected to a traction rod 203. The mounting vertical plate 200 is triangularly arranged. The inclined side at the bottom of the mounting vertical plate 200 is rotatably connected to a rotating plate 201 and a protective chip 205. One end of the hook clamp rod 104 is located at the protective chip 205. The swing arm 400 is rotatably connected to one side surface of the mounting sleeve 101. The top plate 300 is fixedly connected to the top of the main plate 100 by bolts. The mounting plate 301 is fixedly connected to one side of the top of the top plate 300. The upper surface of the mounting plate 301 is fixedly connected to cylinder two 302 and cylinder three 303.

[0031] The main board 100 serves as the foundational support structure of the device, providing a stable mounting base for other components. The mounting plate 200, with its triangular design, enhances structural rigidity and improves support reliability. The top plate 300 is bolted to the top of the main board 100, facilitating the centralized layout of upper functional components. The swing arm 400 is rotatably connected to one side of the mounting sleeve 101, providing a flexible execution end for subsequent actions such as welding and clamping. All components work together to form the main frame of the device. Through a rational layout design, modular integration of the initiation and termination operations is achieved, improving the overall coordination and reliability of the device.

[0032] like Figure 1-4 As shown, in this embodiment, a locking head 202 is fixedly connected to the bottom end of the rotating plate 201. The locking head 202 is engaged with the surface of the hook clamp rod 104, and the output end of the cylinder 102 extends through the surface of the main board 100 to the back of the main board 100. By engaging the locking head 202 at the bottom end of the rotating plate 201 with the hook clamp rod 104, a dynamically connectable locking structure is formed, which not only ensures the synchronization of the movements of the rotating plate 201 and the hook clamp rod 104, but also facilitates the connection of different processes by switching the engagement state. The output shaft of the cylinder 102 extends through the main board 100 to the back, which optimizes the spatial layout of the power transmission path, avoids interference between the output end and other components, and shortens the effective stroke of the power output, thereby improving the driving efficiency. After the cylinder 102 is started, it will drive the hook clamp rod 104 to move and clamp the textile thread.

[0033] like Figure 1-4 As shown, in this embodiment, the clamping head 202 is disposed at one end of the rotating plate 201, and the traction rod 203 is disposed at the other end of the rotating plate 201. The top end of the traction rod 203 is fixedly connected to the clamping connector 204, and the bottom end of the cylinder 2 302 is clamped to the clamping connector 204. By clamping the bottom end of the cylinder 2 302 with the clamping connector 204, a direct drive connection is formed, ensuring that the power of the cylinder 2 302 can be accurately transmitted to the traction rod 203, reducing intermediate transmission losses. The traction rod 203 is connected to the other end of the rotating plate 201, forming a two-end force-bearing structure with the clamping head 202, balancing the torque of the rotating plate 201 during operation, avoiding deviation or jamming caused by unilateral force, and improving the smoothness of the rotation of the rotating plate 201. When the cylinder 2 302 is running, it will drive the traction rod 203, thereby driving the rotating plate 201 to rotate, and through the clamping head 202, it can drive the hook clamp rod 104 to move.

[0034] like Figure 2-4As shown, a tension spring 206 is hooked onto one side of the snap-fit ​​connector 204 in this embodiment, and the top of the tension spring 206 is hooked onto the surface of the mounting plate 301. The tension spring 206 hooks between the mounting plate 301 and the snap-fit ​​connector 204, providing a continuous preload force to the snap-fit ​​connector 204 through elastic tension, ensuring that the snap-fit ​​connector 204 and the cylinder 302 always maintain tight contact, avoiding drive failure due to vibration or loosening. Simultaneously, the tension spring 206 assists the snap-fit ​​connector 204 in resetting when the cylinder 302 retracts, shortening the action cycle time and improving the working efficiency of the device. The elastic force of the tension spring 206 is always applied to the traction rod 203, which will pull the traction rod 203 when no external force is applied.

[0035] like Figure 1-2 As shown, in this embodiment, one end of the swing arm 400 is fixedly connected to a fuse head 403, and the other end of the swing arm 400 is fixedly connected to a pressure plate 401. The fuse head 403 corresponds to the position of the protective chip 205, and the pressure plate 401 corresponds to the bottom end of the cylinder 303. A tension spring 402 is hooked on the edge of the pressure plate 401, and the top end of the tension spring 402 is hooked on the edge of the mounting plate 301. By aligning the fuse head 403 at one end of the swing arm 400 with the protective chip 205, the fuse operation is ensured to be precisely applied to the target wire end, avoiding accidental contact with other components. The pressure plate 401 at the other end corresponds to the bottom end of the cylinder 303. The extension and retraction of the cylinder 303 controls the pressing and releasing of the pressure plate 401, realizing the function of fixing and releasing the wire end. The tension spring 402 is hooked between the edge of the mounting plate 301 and the pressure plate 401, providing a reset spring force for the swing arm 400, so that it can quickly return to the initial position after completing the pressing or fuse action, ensuring the continuity of the process.

[0036] like Figure 2 As shown, in this embodiment, a heating wire 404 is wound around the swing arm 400 near the fuse head 403, and a wire 405 is fixedly connected to the heating wire 404. By winding the heating wire 404 around the swing arm 400, the heat transfer path from the heat source to the fuse head 403 is shortened, improving heating efficiency and reducing energy loss. The wire 405 connects to the heating wire 404, ensuring a stable current input and guaranteeing the temperature control accuracy of the fuse head 403, thereby achieving reliable melting of the wire end and avoiding melting failure due to uneven heating or power outage.

[0037] like Figure 1-3As shown, in this embodiment, a limiting block 500 is fixedly connected to the side of the mounting sleeve 101, and the limiting block 500 is located directly below the swing arm 400. By fixing the limiting block 500 to the side of the mounting sleeve 101 and being located directly below the swing arm 400, the downward swing amplitude of the swing arm 400 is limited by physical obstruction, avoiding collisions or structural damage to the swing arm 400 with other components due to excessive swinging; at the same time, the limiting block 500 provides a clear limiting reference for the movement trajectory of the swing arm 400, improving the positional accuracy of operations such as melting and pressing, and ensuring the stability of the device operation.

[0038] Working principle: The thread-cutting blade below the needle plate of the sewing machine moves to cut the bottom thread. At the same time, cylinder 102 drives the locking head 103 and the hook clamp 104 to move the hook clamp 104 to hook the sewing thread. Then, cylinder 303 moves, driving its bottom end to press against the pressure plate 401 at one end of the swing arm 400, overcoming the tension of the tension spring 402, so that the swing arm 400 is pressed down from a state that is almost parallel to the sewing machine platform. At this moment, the fuse head 403 fixed to the other end of the swing arm 400 precisely aligns with the guard chip 205. The instant the swing arm 400 is pressed down, the heating wire 404 wrapped around the swing arm 400 near the fuse head 403 is energized and heats up (powered by the wire 405). This heat quickly melts the hooked sewing thread between the fuse head 403 and the guard chip 205. After the sewing thread melts, cylinder 2 302 drives the rotating plate 201 to rotate, thus loosening the thread. When the sewing machine starts sewing the second stitch, cylinder 2 302 actuates, its bottom drive... The snap-fit ​​connector 204 engages with the traction rod 203, which in turn drives the rotating plate 201 to rotate (the other end of the rotating plate 201 is engaged with the hook clamp rod 104 via the snap-fit ​​connector 202). This action quickly lifts the hook clamp rod 104, allowing the thread end of the starting seam that it has hooked to be released smoothly. During this process, the tension spring 206 provides an auxiliary reset function, ensuring the speed of the action and the accuracy of the reset. This eliminates a process that requires manual secondary thread cutting, does not restrict the sewing machine presser foot, does not require frequent replacement of the thread cutter blade, and leaves no residual thread ends.

[0039] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A device for sewing machine for starting sewing without nest, and shortening the end of thread, characterized in that, include: The system comprises a main board (100), a mounting vertical plate (200), a top plate (300), and a swing arm (400). A mounting sleeve (101) is fixedly connected to the surface of the main board (100). A cylinder (102) is fixedly installed inside the mounting sleeve (101). A lock head (103) is fixedly connected to the output shaft end of the cylinder (102). A hook clamp rod (104) is fixedly connected to the lock head (103). The mounting vertical plate (200) is fixedly connected to the bottom end of the mounting sleeve (101). A traction rod (203) is fixedly connected to one end of the mounting vertical plate (200) near the lock head (103). The mounting vertical plate (200) is triangular in shape. The inclined side at the bottom of the mounting vertical plate (200) is rotatably connected to the rotating plate (201) and the protective chip (205). One end of the hook clamp rod (104) is located at the protective chip (205). The swing arm (400) is rotatably connected to one side surface of the mounting sleeve (101). The top plate (300) is fixedly connected to the top of the main plate (100) by bolts. The mounting plate (301) is fixedly connected to one side of the top of the top of the top plate (300). The upper surface of the mounting plate (301) is fixedly connected to cylinder two (302) and cylinder three (303).

2. A device for starting stitching without nest and for shortening the end thread of a sewing machine according to claim 1, characterized in that, The bottom end of the rotating plate (201) is fixedly connected to a clamp (202), which is engaged with the surface of the hook clamp rod (104). The output end of the cylinder (102) extends through the surface of the main board (100) to the back of the main board (100).

3. A device for starting stitching without nest and for shortening the end thread of a sewing machine according to claim 1, characterized in that, The clamp head (202) is located at one end of the rotating plate (201), the traction rod (203) is located at the other end of the rotating plate (201), the top end of the traction rod (203) is fixedly connected to the clamp head (204), and the bottom end of the cylinder (302) is clamped to the clamp head (204).

4. A device for starting stitching without nest and for shortening the end thread of a sewing machine according to claim 3, characterized in that, One side of the snap-fit ​​connector (204) is hooked with a tension spring (206), and the top of the tension spring (206) is hooked to the surface of the mounting plate (301).

5. The device for starting stitching without nest and shortening the end thread of a sewing machine according to claim 1, characterized in that, One end of the swing arm (400) is fixedly connected to a fuse head (403), and the other end of the swing arm (400) is fixedly connected to a pressure plate (401). The fuse head (403) corresponds to the position of the protective chip (205), and the pressure plate (401) corresponds to the bottom end of the cylinder three (303). A tension spring two (402) is hooked on the edge of the pressure plate (401), and the top end of the tension spring two (402) is hooked on the edge of the mounting plate (301).

6. A device for starting a stitch without nest and for shortening the end thread of a sewing machine according to claim 5, characterized in that, A heating wire (404) is wound around the swing arm (400) near the fuse head (403), and a wire (405) is fixedly connected to the heating wire (404).

7. The device for starting stitching without nest and for shortening the end thread of a sewing machine according to claim 1, characterized in that, A limiting block (500) is fixedly connected to the side of the mounting sleeve (101), and the limiting block (500) is located directly below the swing arm (400).

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