Thread trimming mechanism for sewing

Abstract

The utility model relates to the technical field of sewing, and discloses a thread trimming mechanism for sewing, which comprises a workbench, a sewing machine body is fixedly connected to the top end of the workbench, a supporting rod is fixedly connected to the inner side of the sewing machine body, a knob is arranged at the front end of the supporting rod, and the knob is connected with a threaded rod through a driving assembly. The threaded rod is connected with the moving frame through a moving assembly so as to adjust the length of a reserved thread end after thread trimming, threading holes are formed in the outer walls of the left side and the right side of the moving frame, an electric push rod is fixedly connected to the top end of the inner wall of the moving frame, and a mounting base is fixedly connected to the driving end of the electric push rod. According to the utility model, the length of the thread residue reserved after thread trimming is adjusted, the specific requirements of different sewing processes and products on the length of the thread residue and the replacement of the cutter are met, and when a cutting part is damaged, only local parts instead of the whole device need to be replaced, so that the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing, in particular to a thread trimming mechanism for sewing. Background Art

[0002] A sewing machine is a machine used to sew cloth, leather and other materials. It uses a series of mechanical devices and transmission systems to pass the thread through the cloth to form stitches, thereby splicing different fabrics together. Compared with manual sewing, sewing machines can complete the sewing work quickly and efficiently, greatly shortening the production time.

[0003] After searching, the thread trimming mechanism for a sewing machine with announcement number CN217869450U includes a sewing workbench, a base is fixedly connected to the top right side of the sewing workbench, a limit seat is fixedly connected to the left side of the base, a body is fixedly connected to the bottom left side of the limit seat, a sewing needle is movably connected to the inside of the body, a thread cutting structure is fixedly connected to the left side of the body, the thread cutting structure includes a fixed seat, and a fixed seat is fixedly connected to the left side of the body. The thread trimming mechanism for a sewing machine places the fabric to be sewn on the sewing workbench, the body drives the sewing needle to sew the fabric, the pedal is stepped on to control and adjust the working gear of the body, thereby changing the sewing speed of the sewing needle, and the electric push rod drives the thread cutter to move up and down, so that the thread cutter contacts the cutting seat and cuts the thread, which can achieve the effect of convenient use and automatic thread cutting.

[0004] Based on the above patent, the cutting knife is provided, and when the cutting knife moves downward, it contacts the cutting seat and cuts the thread. However, the position of the cutting knife is fixed, and it is not convenient to adjust the reserved thread length. In view of this technical problem, the present application proposes a thread cutting mechanism for sewing. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a thread trimming mechanism for sewing, which can adjust the reserved thread length after thread trimming to meet the specific requirements of different sewing processes and products on the thread length, and can replace the cutting blades separately to reduce maintenance costs.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a thread trimming mechanism for sewing, comprising a workbench, a sewing machine body is fixedly connected to the top of the workbench, a support rod is fixedly connected to the inner side of the sewing machine body, a knob is arranged at the front end of the support rod, the knob is connected to a threaded rod through a driving assembly to drive the threaded rod to rotate, the threaded rod is connected to a movable frame through a movable assembly to adjust the length of the thread end reserved after thread trimming, threading holes are provided on the left and right outer walls of the movable frame, an electric push rod is fixedly connected to the top of the inner wall of the movable frame, a mounting seat is fixedly connected to the driving end of the electric push rod, the mounting seat is connected to the connecting rod through a clamping assembly, and a cutting knife is fixedly connected to the bottom end of the connecting rod to facilitate the replacement of the cutting knife.

[0007] Furthermore, the drive assembly includes a rotating shaft fixedly connected to the rear end of the knob, the rear end of the rotating shaft is fixedly connected to a first bevel gear, the outer diameter of the first bevel gear is meshedly connected to a second bevel gear, and the outer wall of the threaded rod is fixedly connected to the inner wall of the second bevel gear.

[0008] Furthermore, the outer wall of the rotating shaft is rotatably connected to the inner wall of the supporting rod, and the left and right ends of the threaded rod are rotatably connected to the left and right ends of the inner wall of the supporting rod respectively.

[0009] Furthermore, the moving assembly includes a slider threadedly connected to the outer wall of the threaded rod, the top of the slider is slidably connected to the top of the inner wall of the support rod, the top of the moving frame is fixedly connected to the bottom of the slider, and the bottom of the moving frame is slidably connected to the top of the workbench.

[0010] Furthermore, the clamping assembly includes clamping blocks slidably connected to the left and right sides of the inner wall of the mounting seat, and the left and right outer walls of the connecting rod are provided with clamping grooves, and the clamping blocks match the shapes of the clamping grooves.

[0011] Furthermore, the opposite ends of the left and right clamping blocks are fixedly connected to springs, the other ends of the springs are respectively fixedly connected to the left and right sides of the inner wall of the mounting seat, and the front ends of the clamping blocks are fixedly connected to control rods.

[0012] Furthermore, a cutting board is fixedly connected to the bottom end of the inner wall of the movable frame, and the cutting board is located below the cutting knife.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the utility model, the reserved thread length after thread cutting is adjusted through the cooperation among the knob, the rotating shaft, the first bevel gear, the second bevel gear, the threaded rod, the slider, the movable frame and the threading hole, so as to meet the specific requirements of different sewing processes and products for the thread length. Whether a shorter thread is required to avoid exposure or a longer thread is required for subsequent processing, it can be easily achieved.

[0015] 2. In the utility model, the replacement of the cutting knife is realized through the mutual cooperation between the mounting seat, the clamping block, the spring, the control rod and the connecting rod. When the cutting parts are damaged, only the local parts need to be replaced instead of the whole device, which reduces the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a thread trimming mechanism for sewing proposed by the utility model;

[0017] Figure 2 This is a cross-sectional view of a support rod of a thread trimming mechanism for sewing proposed by the utility model;

[0018] Figure 3 A schematic diagram of a movable frame of a thread trimming mechanism for sewing proposed by the utility model;

[0019] Figure 4 The utility model is a cross-sectional view of a mounting seat of a thread trimmer mechanism for sewing.

[0020] Legend:

[0021] 1. Workbench; 2. Sewing machine body; 3. Support rod; 4. Knob; 5. Rotating shaft; 6. First bevel gear; 7. Second bevel gear; 8. Threaded rod; 9. Slider; 10. Moving frame; 11. Threading hole; 12. Cutting board; 13. Electric push rod; 14. Mounting seat; 15. Block; 16. Control rod; 17. Spring; 18. Connecting rod; 19. Cutting knife. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Reference Figure 1 and Figure 2The utility model provides an embodiment: a thread trimming mechanism for sewing, comprising a workbench 1, a sewing machine body 2 is fixedly connected to the top of the workbench 1, a support rod 3 is fixedly connected to the inner side of the sewing machine body 2, a knob 4 is arranged at the front end of the support rod 3 to drive the threaded rod 8 to rotate, so as to adjust the length of the reserved thread end after thread trimming, threading holes 11 are opened on the outer walls of the left and right sides of the moving frame 10, a first bevel gear 6 is fixedly connected to the rear end of the rotating shaft 5, a second bevel gear 7 is meshedly connected to the outer diameter of the first bevel gear 6, an outer wall of the threaded rod 8 is fixedly connected to the inner wall of the second bevel gear 7, an outer wall of the rotating shaft 5 is rotatably connected to the inner wall of the support rod 3, and the left and right ends of the threaded rod 8 are respectively rotatably connected to the left and right ends of the inner wall of the support rod 3, a top end of a slider 9 is slidably connected to the top end of the inner wall of the support rod 3, a top end of the moving frame 10 is fixedly connected to the bottom end of the slider 9, a bottom end of the moving frame 10 is slidably connected to the top of the workbench 1, a cutting plate 12 is fixedly connected to the bottom end of the inner wall of the moving frame 10, and the cutting plate 12 is located below the cutting knife 19.

[0024] Specifically, during operation, the sewing thread will pass through the threading holes 11 on both sides of the outer wall of the movable frame 10, and then pass through the sewing thread of the sewing needle of the sewing machine body 2 for sewing. After sewing, the worker rotates the knob 4 according to the specific requirements of different sewing processes and products for the length of the thread head. The knob 4 will drive the rotating shaft 5 to rotate, and the rotating shaft 5 will drive the first bevel gear 6 to rotate, thereby driving the second bevel gear 7 to rotate, and the second bevel gear 7 will drive the threaded rod 8 to rotate, and the threaded rod 8 will drive the slider 9 to move, thereby driving the movable frame 10 to move, so that the position of the movable frame 10 and the sewing needle is changed, thereby changing the line length distance from the sewing needle to the cutting point of the movable frame 10. At this time, the electric push rod 13 is started, and the electric push rod 13 drives the connecting rod 18 through the mounting seat 14 to press the cutting knife 19 down, so that the cutting knife 19 presses the sewing thread on the cutting plate 12 and breaks it.

[0025] Reference Figure 3 and Figure 4 The top of the inner wall of the movable frame 10 is fixedly connected to an electric push rod 13, the driving end of the electric push rod 13 is fixedly connected to a mounting seat 14, and the bottom end of the connecting rod 18 is fixedly connected to a cutting knife 19 to facilitate the replacement of the cutting knife 19. The outer walls on the left and right sides of the connecting rod 18 are provided with card slots, and the card blocks 15 match the shape of the card slots. The opposite ends of the left and right card blocks 15 are fixedly connected to springs 17, and the other ends of the springs 17 are respectively fixedly connected to the left and right sides of the inner wall of the mounting seat 14, and the front ends of the card blocks 15 are fixedly connected to control rods 16.

[0026] Specifically, the cutting blade 19 will be damaged after long-term use and may not be able to cut the sewing thread well. Therefore, the cutting blade 19 needs to be replaced. At this time, the control rod 16 at the front end of the mounting seat 14 is toggled to make the control rod 16 drive the block 15 to move to both sides and disengage from the slot on the connecting rod 18. At this time, the cutting blade 19 can be removed, and then the new cutting blade 19 can be replaced, and the connecting rod 18 is inserted into the mounting seat 14. The connecting rod 18 will squeeze the block 15 to both sides, and the block 15 will compress the spring 17. When the connecting rod 18 enters the innermost part of the mounting seat 14, the spring 17 will rebound the block 15 and enter the slot on the connecting rod 18 to fix the connecting rod 18, thereby fixing the cutting blade 19.

[0027] Working principle: When in use, the sewing thread will pass through the threading hole 11 on the outer wall of the mobile frame 10, and then the sewing thread will pass through the sewing needle of the sewing machine body 2 for sewing. After sewing, the worker can rotate the knob 4, and the knob 4 will drive the rotating shaft 5 to rotate, thereby driving the first bevel gear 6 to rotate, and then driving the second bevel gear 7 to rotate, and the second bevel gear 7 will drive the threaded rod 8 to rotate, and the threaded rod 8 will drive the slider 9 to move, thereby driving the mobile frame 10 to move, so that the position of the mobile frame 10 and the sewing needle is changed, thereby changing the length of the reserved thread head, and at this time, the electric push rod 13 is started, and the electric push rod 13 drives the connecting rod 18 through the mounting seat 14 to press the cutting knife 19 downward , so that the cutting knife 19 presses the sewing thread on the cutting plate 12 and breaks it. After long-term use, the cutting knife 19 will be damaged. At this time, the control rod 16 at the front end of the mounting seat 14 is toggled, so that the control rod 16 drives the card block 15 to move to both sides and disengage from the card slot on the connecting rod 18. At this time, the cutting knife 19 can be removed, and then the new cutting knife 19 can be replaced, and the connecting rod 18 is inserted into the mounting seat 14. The connecting rod 18 will squeeze the card block 15 to both sides, thereby compressing the spring 17. When the connecting rod 18 enters the innermost part of the mounting seat 14, the spring 17 will rebound the card block 15 into the card slot on the connecting rod 18, fix the connecting rod 18, and thus fix the cutting knife 19.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thread trimming mechanism for sewing, characterized in that: The invention comprises a workbench (1), wherein the top of the workbench (1) is fixedly connected to a sewing machine body (2), the inner side of the sewing machine body (2) is fixedly connected to a support rod (3), the front end of the support rod (3) is provided with a knob (4), the knob (4) is connected to a threaded rod (8) through a driving assembly to drive the threaded rod (8) to rotate, the threaded rod (8) is connected to a movable frame (10) through a moving assembly to adjust the length of the reserved thread end after thread cutting, threading holes (11) are provided on the left and right outer walls of the movable frame (10), the top of the inner wall of the movable frame (10) is fixedly connected to an electric push rod (13), the driving end of the electric push rod (13) is fixedly connected to a mounting seat (14), the mounting seat (14) is connected to a connecting rod (18) through a clamping assembly, and the bottom end of the connecting rod (18) is fixedly connected to a cutting knife (19) so as to facilitate the replacement of the cutting knife (19).

2. A thread trimming mechanism for sewing according to claim 1, characterized in that: The driving assembly comprises a rotating shaft (5) fixedly connected to the rear end of the knob (4); the rear end of the rotating shaft (5) is fixedly connected to a first bevel gear (6); the outer diameter of the first bevel gear (6) is meshingly connected to a second bevel gear (7); and the outer wall of the threaded rod (8) is fixedly connected to the inner wall of the second bevel gear (7).

3. A thread trimming mechanism for sewing according to claim 2, characterized in that: The outer wall of the rotating shaft (5) is rotatably connected to the inner wall of the support rod (3), and the left and right ends of the threaded rod (8) are respectively rotatably connected to the left and right ends of the inner wall of the support rod (3).

4. A thread trimming mechanism for sewing according to claim 1, characterized in that: The moving assembly comprises a slider (9) threadedly connected to the outer wall of the threaded rod (8), the top end of the slider (9) being slidably connected to the top end of the inner wall of the support rod (3), the top end of the moving frame (10) being fixedly connected to the bottom end of the slider (9), and the bottom end of the moving frame (10) being slidably connected to the top end of the workbench (1).

5. A thread trimming mechanism for sewing according to claim 1, characterized in that: The clamping assembly comprises clamping blocks (15) slidably connected to the left and right sides of the inner wall of the mounting seat (14); the left and right outer walls of the connecting rod (18) are provided with clamping grooves, and the clamping blocks (15) are in conformity with the shapes of the clamping grooves.

6. A thread trimming mechanism for sewing according to claim 5, characterized in that: The opposite ends of the left and right clamping blocks (15) are fixedly connected to springs (17), and the other ends of the springs (17) are respectively fixedly connected to the left and right sides of the inner wall of the mounting seat (14), and the front ends of the clamping blocks (15) are fixedly connected to control rods (16).

7. A thread trimming mechanism for sewing according to claim 1, characterized in that: A cutting plate (12) is fixedly connected to the bottom end of the inner wall of the movable frame (10), and the cutting plate (12) is located below the cutting knife (19).

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