A comprehensive synchronous feeding sewing machine needle bar support swing mechanism

Abstract

The utility model provides a kind of comprehensive synchronous feeding sewing machine needle bar support swing mechanism, belong to sewing machine auxiliary fittings technical field.It includes needle bar assembly, needle bar swing axle and needle bar swing crank, the needle bar swing crank and needle bar swing axle be connected, the needle bar swing crank and needle bar assembly between be provided with the extension transmission structure for increasing the horizontal spacing between needle bar swing axle and needle bar assembly.By setting extension transmission structure between needle bar swing crank and needle bar assembly, needle bar swing axle can be set in the more rear side of rack, to increase the distance between needle bar swing axle and needle bar assembly, effectively expand the operation area space, improve the convenience of worker operation.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewing machine auxiliary accessories, and relates to a swing mechanism for the needle bar support of an integrated synchronous feeding sewing machine. Background Technology

[0002] The traditional integrated synchronous feeding sewing machine has a design flaw in the layout of the needle bar support swing shaft and presser foot lifting shaft. The needle bar support swing shaft is located directly below the presser foot lifting shaft. This compact and unreasonable layout results in extremely narrow operating space between the needle bar and the needle bar swing shaft within the height area of ​​the needle bar swing shaft. This area is critical for workers to perform daily operations such as threading, cleaning thread ends, and adjusting needle positions. The narrow space not only significantly restricts the range of motion of the worker's hands but also makes it easy for the hands to bump into surrounding parts during operation, increasing the risk of operational errors. At the same time, it is difficult to quickly access core components during equipment maintenance or troubleshooting, significantly prolonging operation and maintenance time and seriously affecting the efficiency and convenience of sewing operations.

[0003] For example, a Chinese patent discloses a needle bar swing mechanism for a sewing machine [application number: 201020667522.4], which includes a needle bar swing frame and a pressing rod installed on the machine housing. The lower end of the needle bar swing frame is provided with a small pressing foot and a needle clamp, and the lower end of the pressing rod is provided with a large pressing foot. The pressing rod is provided with a guide bracket with a positioning groove, and the needle bar swing frame is located in the positioning groove of the guide bracket. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a swing mechanism for the needle bar support of an integrated synchronous feeding sewing machine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A needle bar support swing mechanism for an integrated synchronous feeding sewing machine includes a needle bar assembly, a needle bar swing shaft, and a needle bar swing crank. The needle bar swing crank is connected to the needle bar swing shaft, and an extension transmission structure is provided between the needle bar swing crank and the needle bar assembly to increase the horizontal distance between the needle bar swing shaft and the needle bar assembly.

[0006] In the aforementioned integrated synchronous feeding sewing machine needle bar support swing mechanism, the extended transmission structure includes a needle bar swing connecting rod and a needle bar drive block with a vertical limiting groove. The front and rear ends of the needle bar swing connecting rod are respectively rotatably connected to the needle bar drive block and the needle bar swing crank.

[0007] In the aforementioned integrated synchronous feeding sewing machine needle bar support swing mechanism, the vertical limiting groove on the needle bar drive block is slidably connected to the machine frame.

[0008] In the aforementioned integrated synchronous feeding sewing machine needle bar bracket swing mechanism, the needle bar assembly includes a needle bar for mounting the needle and a needle bar swing bracket, and a needle bar drive rod that is horizontally inserted into the needle bar drive block is fixedly connected to the needle bar swing bracket.

[0009] The aforementioned integrated synchronous feeding sewing machine needle bar support swing mechanism further includes a presser foot assembly, a presser foot lifting shaft, a presser foot transmission structure, and a presser foot pressing assembly. The lifting arm of the presser foot lifting shaft is connected to the presser foot assembly through the presser foot transmission structure. The presser foot assembly is located behind the needle bar assembly. The horizontal distance between the presser foot lifting shaft and the needle bar assembly is smaller than the horizontal distance between the needle bar swing shaft and the needle bar assembly.

[0010] In the aforementioned integrated synchronous feeding sewing machine needle bar support swing mechanism, the presser foot assembly includes a small presser foot fixed to the bottom of the small presser foot rod and an outer presser foot fixed to the bottom of the outer presser foot rod. The small presser foot is disposed between the needle bar and the outer presser foot rod. The small presser foot rod is slidably connected to the needle bar swing bracket. Both the small presser foot rod and the outer presser foot rod are connected to the presser foot lifting shaft through a presser foot transmission structure. The top end of the outer presser foot rod is connected to the presser foot pressing assembly.

[0011] In the aforementioned integrated synchronous feeding sewing machine needle bar support swing mechanism, a lifting presser foot guide plate with a vertical guide groove is also fixedly connected to the needle bar swing support. The top of the small presser foot bar is rotatably connected to a guide shaft, which is inserted into the vertical guide groove.

[0012] In the aforementioned integrated synchronous feeding sewing machine needle bar support swing mechanism, the presser foot transmission structure includes a triangular hinge. A small presser foot connecting rod, a presser foot lifting drive connecting rod, and a large presser foot connecting shaft are rotatably connected to the three corners of the triangular hinge, respectively. The end of the small presser foot connecting rod away from the triangular hinge is connected to a guide shaft. The end of the presser foot lifting drive connecting rod away from the triangular hinge is connected to the lifting arm of the presser foot lifting shaft. The top of the outer presser foot rod is rotatably connected to the large presser foot connecting shaft.

[0013] In the aforementioned integrated synchronous feeding sewing machine needle bar support swing mechanism, the presser foot pressing assembly includes a presser foot support, the triangular hinge is set inside the presser foot support and the large presser foot connecting shaft is rotatably connected to the presser foot support, the top of the presser foot support is fixedly connected to a support connecting rod, the support connecting rod is slidably engaged with a sliding sleeve on the machine frame, and a spring is also provided between the sliding sleeve and the presser foot support.

[0014] In the aforementioned integrated synchronous feeding sewing machine needle bar support swing mechanism, a cam crank is fixedly connected to the needle bar swing shaft, and the cam crank is connected to the presser foot lifting shaft.

[0015] Compared with existing technologies, the advantages of this utility model are: 1. By setting an extended transmission structure between the needle bar swing crank and the needle bar assembly, the needle bar swing shaft can be set further back on the frame, thereby increasing the distance between the needle bar swing shaft and the needle bar assembly, effectively expanding the operating area space and improving the convenience of worker operation.

[0016] 2. The extended transmission structure adopts a design that combines a needle bar swing link with a needle bar drive block with a vertical limiting groove. Both ends of the needle bar swing link are rotatably connected to both. This structure extends the horizontal spacing while ensuring the flexibility of transmission through the rotatable connection. The vertical limiting groove provides a stable motion guide for the needle bar drive block, ensuring the precise movement of the needle bar assembly.

[0017] Other advantages, objectives and features of this invention will be apparent in part from the following description, and in part from the understanding of those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a three-dimensional drawing of the present invention; Figure 2 This is a three-dimensional view of another aspect of this utility model; Figure 3 This is a schematic diagram of the extended transmission structure; Figure 4 This is a schematic diagram of the presser foot transmission structure. Detailed Implementation

[0019] like Figures 1-4 As shown, a needle bar support swing mechanism for an integrated synchronous feeding sewing machine includes a needle bar assembly 1, a needle bar swing shaft 2, and a needle bar swing crank 3. The needle bar swing crank 3 is connected to the needle bar swing shaft 2, and an extension transmission structure 4 is provided between the needle bar swing crank 3 and the needle bar assembly 1 to increase the horizontal distance between the needle bar swing shaft 2 and the needle bar assembly 1.

[0020] In this invention, by setting an extended transmission structure between the needle bar swing crank and the needle bar assembly, compared to the prior art where the needle bar swing crank is directly connected to the needle bar assembly, the needle bar swing shaft can be set further back on the frame, thereby increasing the distance between the needle bar swing shaft and the needle bar assembly, effectively expanding the operating area space and improving the convenience of worker operation.

[0021] Specifically, the extended transmission structure 4 includes a needle bar swing linkage 5 and a needle bar drive block 7 with a vertical limiting groove 6. The front and rear ends of the needle bar swing linkage 5 are rotatably connected to the needle bar drive block 7 and the needle bar swing crank 3, respectively. The extended transmission structure adopts a design that combines the needle bar swing linkage with the needle bar drive block with the vertical limiting groove. Both ends of the needle bar swing linkage are rotatably connected to both. This structure achieves horizontal spacing extension while ensuring transmission flexibility through rotatable connection. The vertical limiting groove provides stable motion guidance for the needle bar drive block, ensuring precise movement of the needle bar assembly.

[0022] Specifically, the vertical limiting groove 6 on the needle bar drive block 7 is slidably connected to the machine frame (not shown in the figure). The slidable connection between the vertical limiting groove of the needle bar drive block and the machine frame further enhances the motion stability and guiding accuracy of the needle bar drive block, prevents it from deviating or shaking during movement, ensures the accuracy of the needle bar assembly's swing, and improves the stability of the sewing machine's operation.

[0023] Specifically, the needle bar assembly 1 includes a needle bar 8 for mounting the needle and a needle bar swing bracket 9. A needle bar drive rod 10, horizontally inserted into the needle bar drive block 7, is fixedly connected to the needle bar swing bracket 9. The needle bar assembly combines the needle bar and the needle bar swing bracket, and the design of connecting the needle bar drive rod to the needle bar drive block ensures that the needle bar swing bracket can stably drive the needle bar movement. The connection structure is simple and reliable, ensuring efficient power transmission and precise execution of the needle bar swing action.

[0024] Specifically, it also includes a presser foot assembly 11, a presser foot lifting shaft 12, a presser foot transmission structure 13, and a presser foot pressing assembly 14. The lifting arm 15 of the presser foot lifting shaft 12 is connected to the presser foot assembly 11 through the presser foot transmission structure 13. The presser foot assembly 11 is located behind the needle bar assembly 1. The horizontal distance between the presser foot lifting shaft 12 and the needle bar assembly 1 is smaller than the horizontal distance between the needle bar swing shaft 2 and the needle bar assembly 1. When the presser foot lifting shaft 12 rotates, it can drive the presser foot assembly 11 to rise through the lifting arm 15 and the presser foot transmission structure 13. The presser foot pressing assembly 14 can drive the presser foot assembly 11 to press down.

[0025] Specifically, the presser foot assembly 11 includes a small presser foot 17 fixed to the bottom of the small presser foot rod 16 and an outer presser foot 19 fixed to the bottom of the outer presser foot rod 18. The small presser foot 17 is positioned between the needle bar 8 and the outer presser foot rod 18. The small presser foot rod 16 is slidably connected to the needle bar swing bracket 9. Both the small presser foot rod 16 and the outer presser foot rod 18 are connected to the presser foot lifting shaft 12 via the presser foot transmission structure 13. The top end of the outer presser foot rod 18 is connected to the presser foot pressing assembly 14. The presser foot assembly adopts a combination design of a small presser foot and an outer presser foot. The small presser foot is located between the needle bar and the outer presser foot rod, and the small presser foot rod is slidably connected to the needle bar swing bracket. Both are connected to the presser foot lifting shaft via the presser foot transmission structure. This design allows the small presser foot to move synchronously with the needle bar swing bracket. The slidable connection ensures the flexibility of the small presser foot's lifting and lowering, improves the presser foot's holding effect on the fabric, and adapts to different sewing needs.

[0026] Specifically, a lifting guide plate 21 with a vertical guide groove 20 is fixedly connected to the needle bar swing bracket 9. The top end of the small presser foot rod 16 is rotatably connected to a guide shaft 22, which is inserted into the vertical guide groove 20. The lifting guide plate on the needle bar swing bracket cooperates with the guide shaft of the small presser foot rod through the vertical guide groove, providing precise guidance for the vertical movement of the small presser foot rod, preventing the small presser foot rod from deviating during movement, ensuring stable lifting and lowering of the small presser foot, and improving the reliability of pressing.

[0027] Specifically, the presser foot transmission structure 13 includes a triangular hinge 23. A small presser foot connecting rod 24, a presser foot lifting drive connecting rod 25, and a large presser foot connecting shaft 26 are rotatably connected to the three corners of the triangular hinge 23, respectively. The end of the small presser foot connecting rod 24 away from the triangular hinge 23 is connected to a guide shaft 22. The end of the presser foot lifting drive connecting rod 25 away from the triangular hinge 23 is connected to the lifting arm 15 of the presser foot lifting shaft 12. The top of the outer presser foot rod 18 is rotatably connected to the large presser foot connecting shaft 26. The presser foot transmission structure uses a triangular hinge to connect the small presser foot connecting rod, the presser foot lifting drive connecting rod, and the large presser foot connecting shaft, achieving synchronous transmission of power from the presser foot lifting shaft to the small and outer presser feet. This structure is highly efficient and stable, ensuring the coordination of the small and outer presser foot movements and improving the consistency of the presser foot assembly's operation.

[0028] Specifically, the presser foot pressing assembly 14 includes a presser foot bracket 27. A triangular hinge 23 is disposed within the presser foot bracket 27, and the large presser foot connecting shaft 26 is rotatably connected to the presser foot bracket 27. A bracket connecting rod 28 is fixedly connected to the top of the presser foot bracket 27. The bracket connecting rod 28 slides with a sliding sleeve 29 on the frame. A spring 30 is also provided between the sliding sleeve 29 and the presser foot bracket 27. Through the sliding engagement of the presser foot bracket, the bracket connecting rod, and the sliding sleeve, as well as the spring design, the presser foot pressing assembly provides stable downward pressure for the outer presser foot. The spring buffers pressure changes, making the pressing force of the outer presser foot on the fabric more uniform, adapting to fabrics of different thicknesses, and improving sewing quality.

[0029] Specifically, a cam crank (not shown in the figure) is fixedly connected to the needle bar swing shaft 2, and the cam crank is connected to the presser foot lifting shaft 12. The connection between the cam crank on the needle bar swing shaft and the presser foot lifting shaft realizes the linkage control of the needle bar swing and the presser foot lifting action, ensuring the coordination and synchronization of the two actions, reducing the complexity of individual control of each component, and improving the working efficiency of the sewing machine.

[0030] The working principle of this utility model is as follows: by setting an extended transmission structure between the needle bar swing crank and the needle bar assembly, compared with the prior art where the needle bar swing crank is directly connected to the needle bar assembly, the needle bar swing shaft can be set on the rear side of the frame, thereby increasing the distance between the needle bar swing shaft and the needle bar assembly, effectively expanding the operating area space and improving the convenience of worker operation. The extended transmission structure adopts a design that combines a needle bar swing linkage with a needle bar drive block with a vertical limiting groove. The two ends of the needle bar swing linkage are rotatably connected to both. This structure extends the horizontal distance while ensuring the flexibility of transmission through the rotatable connection. The vertical limiting groove provides a stable motion guide for the needle bar drive block, ensuring the precise movement of the needle bar assembly. The vertical limiting groove of the needle bar drive block is slidably connected to the frame, further enhancing the motion stability and guiding accuracy of the needle bar drive block, preventing it from deviating or shaking during movement, ensuring the accuracy of the needle bar assembly swing, and improving the stability of the sewing machine operation. When the presser foot lifting shaft 12 rotates, it can drive the presser foot assembly 11 to lift through the lifting arm 15 and the presser foot transmission structure 13. The presser foot pressing assembly 14 can drive the presser foot assembly 11 to press down. The presser foot assembly adopts a combination design of small presser foot and outer presser foot. The small presser foot is located between the needle bar and the outer presser foot rod. The small presser foot rod is slidably connected to the needle bar swing bracket, and both are connected to the presser foot lifting shaft through the presser foot transmission structure. The presser foot lifting guide plate on the needle bar swing bracket cooperates with the guide shaft of the small presser foot rod through the vertical guide groove, providing precise guidance for the vertical movement of the small presser foot rod, avoiding deviation when the small presser foot rod moves, ensuring the stability of the small presser foot lifting action, and improving the reliability of the pressing. The presser foot transmission structure adopts a triangular hinge to connect the small presser foot connecting rod, the presser foot lifting drive connecting rod and the large presser foot connecting shaft, realizing the synchronous transmission of power from the presser foot lifting shaft to the small presser foot and the outer presser foot. This structure is efficient and stable, ensuring the coordination of the small presser foot and the outer presser foot actions, and improving the working consistency of the presser foot assembly. The presser foot pressing assembly provides stable downward pressure to the outer presser foot through the sliding cooperation of the presser foot bracket, bracket connecting rod and sliding sleeve and the spring design. The cam crank on the needle bar swing shaft is connected to the presser foot lifting shaft, realizing the linkage control of the needle bar swing and the presser foot lifting action, ensuring the coordination and synchronization of the two actions, reducing the complexity of individual control of each component, and improving the working efficiency of the sewing machine.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A needle bar support swing mechanism for a comprehensive synchronous feeding sewing machine, comprising a needle bar assembly (1), a needle bar swing shaft (2), and a needle bar swing crank (3), wherein the needle bar swing crank (3) and the needle bar swing shaft (2) are connected, characterized in that, An extended transmission structure (4) is provided between the needle bar swing crank (3) and the needle bar assembly (1) to increase the horizontal distance between the needle bar swing shaft (2) and the needle bar assembly (1).

2. The integrated synchronous feeding sewing machine needle bar support swing mechanism according to claim 1, characterized in that, The extended transmission structure (4) includes a needle bar swing link (5) and a needle bar drive block (7) with a vertical limiting groove (6). The front and rear ends of the needle bar swing link (5) are rotatably connected to the needle bar drive block (7) and the needle bar swing crank (3), respectively.

3. The integrated synchronous feeding sewing machine needle bar support swing mechanism according to claim 2, characterized in that, The vertical limiting groove (6) on the needle bar drive block (7) is slidably connected to the frame.

4. The integrated synchronous feeding sewing machine needle bar support swing mechanism according to claim 2, characterized in that, The needle bar assembly (1) includes a needle bar (8) for mounting a needle and a needle bar swing bracket (9), and a needle bar drive rod (10) is fixedly connected to the needle bar swing bracket (9) and inserted horizontally into the needle bar drive block (7).

5. The integrated synchronous feeding sewing machine needle bar support swing mechanism according to claim 4, characterized in that, It also includes a presser foot assembly (11), a presser foot lifting shaft (12), a presser foot transmission structure (13), and a presser foot pressing assembly (14). The lifting arm (15) of the presser foot lifting shaft (12) is connected to the presser foot assembly (11) through the presser foot transmission structure (13). The presser foot assembly (11) is located on the rear side of the needle bar assembly (1). The horizontal distance between the presser foot lifting shaft (12) and the needle bar assembly (1) is smaller than the horizontal distance between the needle bar swing shaft (2) and the needle bar assembly (1).

6. The integrated synchronous feeding sewing machine needle bar support swing mechanism according to claim 5, characterized in that, The presser foot assembly (11) includes a small presser foot (17) fixed to the bottom of the small presser foot rod (16) and an outer presser foot (19) fixed to the bottom of the outer presser foot rod (18). The small presser foot (17) is located between the needle bar (8) and the outer presser foot rod (18). The small presser foot rod (16) is slidably connected to the needle bar swing bracket (9). Both the small presser foot rod (16) and the outer presser foot rod (18) are connected to the presser foot lifting shaft (12) through the presser foot transmission structure (13). The top of the outer presser foot rod (18) is connected to the presser foot pressing assembly (14).

7. The integrated synchronous feeding sewing machine needle bar support swing mechanism according to claim 6, characterized in that, The needle bar swing bracket (9) is also fixedly connected to a lifting foot guide plate (21) with a vertical guide groove (20). The top end of the small foot bar (16) is rotatably connected to a guide shaft (22), which is inserted into the vertical guide groove (20).

8. The integrated synchronous feeding sewing machine needle bar support swing mechanism according to claim 7, characterized in that, The presser foot transmission structure (13) includes a triangular hinge (23). A small presser foot connecting rod (24), a presser foot lifting drive connecting rod (25), and a large presser foot connecting shaft (26) are rotatably connected to the three corners of the triangular hinge (23). The end of the small presser foot connecting rod (24) away from the triangular hinge (23) is connected to the guide shaft (22). The end of the presser foot lifting drive connecting rod (25) away from the triangular hinge (23) is connected to the lifting arm (15) of the presser foot lifting shaft (12). The top of the outer presser foot rod (18) is rotatably connected to the large presser foot connecting shaft (26).

9. The integrated synchronous feeding sewing machine needle bar support swing mechanism according to claim 8, characterized in that, The presser foot pressing assembly (14) includes a presser foot bracket (27), the triangular hinge (23) is set inside the presser foot bracket (27) and the large presser foot connecting shaft (26) is rotatably connected to the presser foot bracket (27), the top of the presser foot bracket (27) is fixedly connected to a bracket connecting rod (28), the bracket connecting rod (28) is slidably engaged with the sliding sleeve (29) on the frame, and a spring (30) is also provided between the sliding sleeve (29) and the presser foot bracket (27).

10. The integrated synchronous feeding sewing machine needle bar support swing mechanism according to claim 5, characterized in that, A cam crank is fixedly connected to the needle bar swing shaft (2), and the cam crank is connected to the presser foot lifting shaft (12).

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