Thread cutting mechanism of sewing machine

Abstract

The utility model relates to the technical field of sewing equipment, in particular to a thread cutting mechanism of a sewing machine. The problems that an existing wire cutting mechanism is complex in structure, and debugging can be conducted only after all parts are installed in place in the debugging process are solved. The technical scheme adopted by the utility model comprises a movable cutter holder, the movable cutter holder is irregular, a groove is transversely formed in the upper surface of the movable cutter holder, the fixed cutter is fixedly arranged in the groove, sliding grooves allowing the movable cutter to slide are formed in the two side faces of the groove respectively, the upper surface of the movable cutter is fixedly arranged on the fixing plate, and the movable cutter is driven to slide in the sliding grooves through movement of the fixing plate. A right mounting plate and a left mounting plate are respectively arranged on the upper surface of the movable cutter seat on two sides of the fixed plate, a brake plate is arranged on the left mounting plate, a spring plate is arranged between the brake plate and the left mounting plate, and the other end of the spring plate is pressed on the movable cutter. The novel independent wire cutting mechanism is arranged, the structure is simpler, and the installation space is smaller. Maintenance is convenient, maintenance cost is reduced, and efficiency is improved.

Description

Technical Field

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

[0002] At present, the thread trimming mechanism of sewing machines is divided into two parts: the moving knife mechanism and the fixed knife mechanism, which are installed independently. The assembly precision required is high, and the position is not easy to adjust. At the same time, the installation space required is also large. In addition, the structure is complex, and during the debugging process, all parts need to be installed in place before debugging can be carried out. Utility Model Content

[0003] In view of this, the utility model provides a thread cutting mechanism for a sewing machine, which has a simple structure and is convenient for debugging.

[0004] In order to solve the problems existing in the prior art, the technical solution of the utility model is: a thread cutting mechanism of a sewing machine, characterized in that it includes a moving knife seat; the moving knife seat is irregular in shape, and a groove is transversely arranged on its upper surface, the fixed knife is fixedly arranged in the groove, and slide grooves for sliding the moving knife are respectively arranged on the two side surfaces of the groove, and the upper surface of the moving knife is fixedly arranged on a fixed plate, and the moving knife is driven to slide in the slide groove by the movement of the fixed plate; the upper surfaces of the moving knife seat on both sides of the fixed plate are respectively provided with a right mounting plate and a left mounting plate, and a brake plate is arranged on the left mounting plate, and a spring plate is arranged between the brake plate and the left mounting plate, and the other end of the spring plate is pressed on the moving knife;

[0005] The front end of the fixed knife is provided with a fixed knife cutting edge;

[0006] The front end of the movable knife is provided with a movable knife edge, and the rear side of the movable knife edge is provided with a wire outlet groove.

[0007] Further, a rotary hook stop hook is provided at the left end of the movable knife seat;

[0008] Furthermore, the brake plate is L-shaped, and the horizontal edge is used to limit the fixing plate.

[0009] Further, the spring plate is Z-shaped.

[0010] Furthermore, a top screw hole is arranged on the movable knife seat at the lower end of the fixed knife edge of the fixed knife, and a top screw is arranged in the top screw hole.

[0011] Furthermore, the fixed knife and the movable knife are arranged close to each other.

[0012] Compared with the prior art, the advantages of the utility model are as follows:

[0013] 1. The utility model is equipped with a new independent tangent mechanism, which has a simpler structure and requires less space for installation, making maintenance more convenient, reducing maintenance costs and improving efficiency.

[0014] 2. The utility model designs the rotary hook stopper on the moving knife seat, and transfers the function of the stopper hook of the original needle plate to the thread cutting mechanism, so that the needle plate can be designed in different shapes, making the entire equipment more applicable.

[0015] 3. Designing the moving knife and the fixed knife in one component can better meet the assembly accuracy, make adjustment more convenient, and improve the stability of the wire cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is an exploded view of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the movable knife seat;

[0019] Figure 4 It is a schematic diagram of the structure of the moving knife;

[0020] Figure 5 It is a schematic diagram of the fixed knife structure.

[0021] Marking description: 1-moving knife seat, 2-fixed knife, 3-moving knife, 4-fixed plate, 5-right mounting plate, 6-left mounting plate, 7-spring plate, 8-brake plate, 9-screw 1, 10-screw 2, 11-screw 3, 12-screw 4, 13-top screw;

[0022] 1-1 groove, 1-2 slide groove, 1-3 right mounting surface, 1-4 left mounting surface, 1-5 rotary hook stop hook, 1-6 top screw hole;

[0023] 2-1 fixed blade edge;

[0024] 3-1 moving knife edge, 3-2 wire outlet slot. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present embodiment provides a thread trimming mechanism for a sewing machine, comprising a movable knife seat 1, a fixed knife 2, a movable knife 3, a fixed plate 4, a right mounting plate 5, a left mounting plate 6, a spring plate 7, a brake plate 8, a screw 1 9, a screw 2 10, a screw 3 11, a screw 4 12 and a top screw 13, as shown in FIG. Figure 1-Figure 3 As shown;

[0027] As an implementation method in this embodiment,

[0028] The movable knife seat 1 is irregular in shape, and a groove 1-1 is horizontally arranged on its upper surface. The fixed knife 2 is fixed in the groove 1-1 by screws 10. Slide grooves 1-2 for the movable knife 3 to slide are respectively arranged on both side surfaces of the groove 1-1. The upper surface of the movable knife 3 is fixed on the fixed plate 4 by screws 9. The movable knife 3 is driven to slide in the slide groove 1-2 by the movement of the fixed plate 4. The fixed knife 2 and the movable knife 3 are arranged close to each other; the upper surfaces of the movable knife seat 1 on both sides of the fixed plate 4 are respectively provided with a right mounting plate 5 and a left mounting plate 6 by screws 11, and the left mounting plate 6 is connected with a brake plate 8 by screws 12. The right mounting plate 5 restricts the movable knife 3 to make linear motion in the slide groove 1-2.

[0029] A spring plate 7 is arranged between the brake plate 8 and the left mounting plate 6, and the other end of the spring plate 7 is pressed on the movable knife 3;

[0030] As an implementation method in this embodiment, the front end of the fixed knife 2 is provided with a fixed knife edge 2-1, such as Figure 4 As shown;

[0031] As an implementation method in this embodiment, a moving blade edge 3-1 is provided at the front end of the moving blade 3, and a wire outlet groove 3-2 is provided at the rear side of the moving blade edge 3-1. Figure 5 shown.

[0032] As an implementation method in this embodiment, a rotary hook stop hook 1-5 is provided at the left end of the movable knife seat 1 to limit the rotation of the rotary hook outer liner;

[0033] As an implementation method in this embodiment, the brake plate 8 is L-shaped, and the horizontal edge is used to limit the fixing plate 4.

[0034] As an implementation method in this embodiment, the spring plate 7 is Z-shaped.

[0035] As an implementation method in this embodiment, a top screw hole 1-6 is provided on the movable knife seat 1 at the lower end of the fixed knife edge 2-1 of the fixed knife 2, and a top screw 13 is provided in the top screw hole 1-6. If the cutting line cannot be cut, the top screw is adjusted upward, and the top screw lifts the front end of the fixed knife to reduce the gap between the fixed knife and the movable knife and increase the pressure.

[0036] The working process of the utility model is as follows: the fixed plate 4 is connected to the driving mechanism. When the thread needs to be cut, the driving mechanism is started. The driving mechanism moves backward to drive the fixed plate 4 to make a linear motion. The movable knife 3 connected to the fixed plate 4 also moves backward in the sliding groove 1-2 at the same time. The movable knife 3 hooks the suture from the outlet groove 3-2. When the groove 3-2 moves to the bottom of the spring plate 7, the suture is pressed between the spring plate 7 and the movable knife 3. The suture is tightened by the pressure. The movable knife 3 continues to move backward. When the movable knife edge 3-1 contacts the fixed knife edge 2-1, the suture is cut. At this time, the driving mechanism drives the fixed plate 4 to move forward. When the fixed plate 4 moves to the brake plate 8, it stops, and a thread cutting action is completed.

[0037] If the fixed knife pressure is reduced or the wire cannot be cut due to wear, the top screw 13 can be adjusted to move the fixed knife edge 2-1 of the fixed knife 2 upward, thereby reducing the gap between the fixed knife 2 and the movable knife 3 and increasing the pressure.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A thread cutting mechanism for a sewing machine, characterized in that: The movable knife seat (1) comprises a movable knife seat (1); the movable knife seat (1) is irregular in shape, and a groove (1-1) is transversely arranged on its upper surface, the fixed knife (2) is fixedly arranged in the groove (1-1), and two side surfaces of the groove (1-1) are respectively provided with slide grooves (1-2) for the movable knife (3) to slide, and the upper surface of the movable knife (3) is fixedly arranged on a fixed plate (4), and the movable knife (3) is driven to slide in the slide groove (1-2) by the movement of the fixed plate (4); the upper surfaces of the movable knife seat (1) on both sides of the fixed plate (4) are respectively provided with a right mounting plate (5) and a left mounting plate (6), and a brake plate (8) is arranged on the left mounting plate (6), and a spring plate (7) is arranged between the brake plate (8) and the left mounting plate (6), and the other end of the spring plate (7) is pressed on the movable knife (3); The front end of the fixed knife (2) is provided with a fixed knife edge (2-1); A moving blade edge (3-1) is arranged at the front end of the moving blade (3), and a wire outlet groove (3-2) is arranged at the rear side of the moving blade edge (3-1).

2. A thread cutting mechanism for a sewing machine according to claim 1, characterized in that: A rotary hook stop hook (1-5) is provided at the left end portion of the movable knife seat (1).

3. A thread cutting mechanism for a sewing machine according to claim 1 or 2, characterized in that: The brake plate (8) is L-shaped, and the horizontal edge is used to limit the fixing plate (4).

4. A thread cutting mechanism for a sewing machine according to claim 3, characterized in that: The spring plate (7) is Z-shaped.

5. A thread cutting mechanism for a sewing machine according to claim 4, characterized in that: A top screw hole (1-6) is provided on the movable knife seat (1) at the lower end of the fixed knife edge (2-1) of the fixed knife (2), and a top screw (13) is provided in the top screw hole (1-6).

6. A thread cutting mechanism for a sewing machine according to claim 5, characterized in that: The fixed knife (2) and the movable knife (3) are arranged close to each other.

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