Backstitch structure of sewing machine

Abstract

The backstitch structure of the sewing machine comprises a workbench, two clamping blocks used for fixing cloth are arranged on the workbench in a sliding mode, a fixing plate is arranged on one side of any clamping block, a main transmission shaft is arranged on the fixing plate, a pressing frame is arranged on the main transmission shaft, and a reserved opening corresponding to the pressing frame is formed in the workbench. An auxiliary transmission shaft is arranged below the table top of the working table, a fixing seat is arranged at any short end of the bottom of the working table, a moving shaft and a connecting shaft are rotationally connected to the fixing seat, and the moving shaft and the connecting shaft are connected through two bevel gears which are meshed with each other. Under the action of the clamping blocks, it is guaranteed that the cloth does not deflect in the sewing process, and meanwhile the position, needing backstitching, of the cloth can be pressed under the action of the sliding wheels, so that the sewing quality of the cloth is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a reverse stitching structure of a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. A sewing machine can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products such as leather, plastic, and paper. The stitches are neat, beautiful, flat, and firm, and the sewing speed is fast and easy to use.

[0003] In the existing solutions, the operator usually manually presses and slowly pushes the fabric to achieve the forward or reverse sewing process. However, during the pushing process, the operator may cause the reverse sewing process to deviate due to fatigue or other reasons, thereby affecting the sewing quality. In response to this, a reverse sewing structure for a sewing machine is proposed. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to provide a sewing machine reverse stitching structure capable of preventing fabric from being deflected during the reverse stitching process.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a reverse stitch structure of a sewing machine, comprising a workbench, on which two clamping blocks for fixing cloth are slidably provided, a fixing plate is provided on one side of any one of the clamping blocks, a main transmission shaft is provided on the fixing plate, a clamping frame is provided on the main transmission shaft, a reserved opening corresponding to the clamping frame is opened on the workbench, two limiting plates for stabilizing the cloth are provided in the reserved opening, a secondary transmission shaft is provided under the workbench surface, a fixed seat is provided at any shorter end of the bottom of the workbench, a movable shaft and a connecting shaft are rotatably connected to the fixed seat, and the movable shaft and the connecting shaft are connected by two mutually meshing bevel gears.

[0006] Preferably, the two clamping blocks are connected via a fixing rod, and the fixing rod is located below the workbench surface.

[0007] Preferably, a movable hole is provided on the fixing rod, and the movable shaft is threadedly connected to the movable hole.

[0008] Preferably, a servo motor is provided on the fixed plate, and the servo motor is used to drive the main transmission shaft to rotate in a forward or reverse direction.

[0009] Preferably, the main transmission shaft and the auxiliary transmission shaft are connected via a first belt, and the connecting shaft and the auxiliary transmission shaft are connected via a second belt.

[0010] Preferably, a pushing block and a fixed block are provided in the clamping block, and the pushing block and the fixed block are respectively connected for horizontal and vertical sliding in the clamping block. The pushing block and the fixed block are connected by a transmission rod, and a limit block for limiting the pushing block is provided in the sliding direction of the pushing block in the clamping block.

[0011] Preferably, the pressing frame is provided with four or more pressing ports, a clamping block is provided in the pressing port, a sliding wheel for pressing the cloth down is provided on the clamping block, the sliding wheel is rotatably connected to the clamping block, a return spring is provided between the side where the multiple clamping blocks are close to each other and the pressing port, and the length of the sliding wheel is greater than the width of the reserved port.

[0012] Preferably, a sewing device is provided above the workbench surface, and the sewing device is located on one side of the plurality of clamping blocks.

[0013] The technical solution of the utility model has achieved the following beneficial technical effects:

[0014] By setting the clamping block and the sliding wheel, the clamping block can ensure that the cloth will not deflect during the sewing process. At the same time, the sliding wheel can also press the cloth at the position where reverse sewing is required to ensure the sewing quality of the cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the structure below the workbench surface in the utility model;

[0017] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0018] Figure 4 for Figure 2 The enlarged structural diagram at B in the middle;

[0019] Figure 5 This is a schematic diagram of the structure of the clamping frame in the utility model;

[0020] Figure 6 It is a structural schematic diagram of the clamping block in the utility model.

[0021] The reference numerals in the figure are as follows: 1. workbench; 2. fixed plate; 3. servo motor; 4. main transmission shaft; 5. clamping frame; 6. reserved opening; 7. sliding block; 8. sliding wheel; 9. reset spring; 10. clamping block; 11. fixed rod; 12. connecting shaft; 13. auxiliary transmission shaft; 14. movable shaft; 15. fixed block; 16. pushing block; 17. limit block; 18. sewing device; 19. limiting plate; 20. second belt; 21. first belt. DETAILED DESCRIPTION

[0022] This embodiment is a sewing machine reverse stitching structure, referring to Figure 1-Figure 6 , including a workbench 1, on which two clamping blocks 10 for fixing cloth are slidably provided, the two clamping blocks 10 are connected by a fixing rod 11, the fixing rod 11 is provided with a moving hole, a pushing block 16 and a fixing block 15 are provided in the clamping block 10, the pushing block 16 and the fixing block 15 are respectively connected in a horizontal and vertical sliding manner in the clamping block 10, the pushing block 16 and the fixing block 15 are connected by a transmission rod, a limiting block 17 for limiting the pushing block 16 is provided in the sliding direction of the pushing block 16 in the clamping block 10, a moving shaft 14 is threadedly connected to the moving hole, the fixing rod 11 is located below the surface of the workbench 1, any one A fixing plate 2 is provided on one side of each clamping block 10, and a servo motor 3 is provided on the fixing plate 2. The servo motor 3 is used to drive the main transmission shaft 4 to rotate in the forward or reverse direction. The fixing plate 2 is provided with a main transmission shaft 4. When the main transmission shaft 4 rotates, the auxiliary transmission shaft 13 is driven to rotate through the first belt 21. The auxiliary transmission shaft 13 is driven to rotate through the second belt 20. The connecting shaft 12 rotates and the moving shaft 14 is driven to rotate through two mutually meshing bevel gears. Since the moving shaft 14 is threadedly connected to the fixing rod 11, when the servo motor 3 drives the main transmission shaft 4 to rotate, the two clamping blocks 10 will move;

[0023] A pressing frame 5 is provided on the main transmission shaft 4, and four or more pressing ports are provided on the pressing frame 5. A sliding block 7 is provided in the pressing port, and a sliding wheel 8 for pressing the cloth down is provided on the sliding block 7. The sliding wheel 8 is rotatably connected to the sliding block 7. A reset spring 9 is provided between the side where the multiple sliding blocks 7 are close to each other and the pressing port. The length of the sliding wheel 8 is greater than the width of the reserved port 6. A reserved port 6 corresponding to the pressing frame 5 is provided on the workbench 1. Two limiting plates 19 for stabilizing the cloth are provided in the reserved port 6, wherein the pressing frame 5 is located in the vertical direction between the two limiting plates 19, and the workbench 1 A secondary transmission shaft 13 is provided below the surface, and a fixed seat is provided at any shorter end of the bottom of the workbench 1, on which a moving shaft 14 and a connecting shaft 12 are rotatably connected, and the moving shaft 14 and the connecting shaft 12 are connected by two mutually meshing bevel gears. Through the provided bevel gears, the connecting shaft 12 can drive the moving shaft 14 to rotate, the main transmission shaft 4 and the secondary transmission shaft 13 are connected by a first belt 21, and the connecting shaft 12 and the secondary transmission shaft 13 are connected by a second belt 20, and a sewing device 18 is provided above the workbench 1 surface, and the sewing device 18 is located on one side of the multiple sliding blocks 7.

[0024] Operation process: The two front ends of the fabric to be reverse-sewn are pulled into the clamping block 10 by the operator's hands, and then the operator's hands push the pushing block 16, so that the fixing block 15 moves down, and the pulled-in fabric is pressed to prevent it from shifting, and the pushing block 16 can be limited by the action of the limiting block 17, wherein the limiting block 17 and the clamping block 10 slide in the vertical direction, and a fixing spring is provided between the two, and the limiting block 17 is provided with an inclined surface. When the pushing block 16 is pushed, one of the components of the pushing force will push the limiting block 17 upward, and the pushing block 16 is provided with a limiting groove corresponding to the limiting block 17. After the limiting block 17 moves up, the pushing block 16 The moving block 16 continues to move forward, and then the limiting block 17 will enter the limiting groove, so as to limit the pushing block 16, so as to prevent the fabric from deflecting during the sewing process. After the clamping is completed, the clamping block 10 is driven to move by the action of the servo motor 3. At the same time, it should be noted that during the fabric clamping process, a part of the fabric needs to be reserved near the left clamping block 10, and it is stretched under the action of the two limiting plates 19. Since the pressing frame 5 is located in the vertical direction between the two limiting plates 19, the reserved part of the fabric will not be affected by the pressing frame 5, and the sewing position of the fabric is limited so that it will not deflect, and the arc formed by it is lower than the lowest point of the pressing frame 5;

[0025] Then, when the cloth moves with the clamping block 10 , the pressing frame 5 rotates to press the moving cloth so that it is close to the upper surface of the workbench 1 , and then the cloth is reverse-sewn by the sewing device 18 .

[0026] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A sewing machine backstitching structure, comprising a workbench (1), characterized in that: Two clamping blocks (10) for fixing the cloth are slidably provided on the workbench (1), a fixing plate (2) is provided on one side of any one of the clamping blocks (10), a main transmission shaft (4) is provided on the fixing plate (2), a pressing frame (5) is provided on the main transmission shaft (4), a reserved opening (6) corresponding to the pressing frame (5) is provided on the workbench (1), two limiting plates (19) for stabilizing the cloth are provided in the reserved opening (6), a secondary transmission shaft (13) is provided below the workbench (1) surface, a fixing seat is provided at any shorter end of the bottom of the workbench (1), a moving shaft (14) and a connecting shaft (12) are rotatably connected to the fixing seat, and the moving shaft (14) and the connecting shaft (12) are connected via two mutually meshing bevel gears.

2. A sewing machine reverse stitching structure according to claim 1, characterized in that: The two clamping blocks (10) are connected via a fixing rod (11), and the fixing rod (11) is located below the surface of the workbench (1).

3. A sewing machine reverse stitching structure according to claim 2, characterized in that: The fixed rod (11) is provided with a moving hole, and the moving shaft (14) is threadedly connected to the moving hole.

4. A sewing machine reverse stitching structure according to claim 1, characterized in that: The fixed plate (2) is provided with a servo motor (3), and the servo motor (3) is used to drive the main transmission shaft (4) to rotate in a forward or reverse direction.

5. The reverse stitching structure of a sewing machine according to claim 1, characterized in that: The main transmission shaft (4) and the auxiliary transmission shaft (13) are connected via a first belt (21), and the connecting shaft (12) and the auxiliary transmission shaft (13) are connected via a second belt (20).

6. A sewing machine reverse stitching structure according to claim 1, characterized in that: A pushing block (16) and a fixed block (15) are provided in the clamping block (10); the pushing block (16) and the fixed block (15) are respectively connected in a horizontal and vertical sliding manner in the clamping block (10); the pushing block (16) and the fixed block (15) are connected via a transmission rod; a limiting block (17) for limiting the pushing block (16) is provided in the clamping block (10) in the sliding direction of the pushing block (16).

7. A sewing machine reverse stitching structure according to claim 1, characterized in that: The pressing frame (5) is provided with four or more pressing openings, a sliding block (7) is provided in the pressing opening, a sliding wheel (8) for pressing the cloth downward is provided on the sliding block (7), the sliding wheel (8) is rotatably connected to the sliding block (7), a return spring (9) is provided between the side where the plurality of sliding blocks (7) are close to each other and the pressing opening, and the length of the sliding wheel (8) is greater than the width of the reserved opening (6).

8. A sewing machine reverse stitching structure according to claim 7, characterized in that: A sewing device (18) is provided above the workbench (1) surface, and the sewing device (18) is located on one side of the plurality of sliding blocks (7).

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