Thread cutting device of overlock machine for garment sewing

Abstract

The utility model discloses an overlock machine thread cutting device for clothing sewing, which comprises a thread cutting support, two thread cutting structures and a driving component, the two thread cutting structures are arranged in the thread cutting support and are symmetrically arranged up and down, the two thread cutting structures are provided with the driving component, and the driving component is connected with the thread cutting support. The utility model relates to the technical field of overedgers, the two thread cutting structures which are symmetrically arranged up and down are used for replacing a traditional thread cutting device, the novel thread cutting structure adopts a crankshaft connecting rod driving mode to realize faster and more stable thread cutting action, and compared with the traditional thread cutting device, the thread cutting device has the advantages that the thread cutting effect is better; the novel thread cutting structure has a higher thread cutting speed and a more reliable thread cutting effect, meanwhile, the two thread cutting structures are driven only through one motor, the thread cutting efficiency is greatly improved, waiting and switching time is shortened, and therefore the working efficiency of the whole overlock machine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of overlock sewing machines, in particular to a thread cutting device of an overlock sewing machine for sewing clothes. Background Art

[0002] Overlock sewing machines are also called edge machines, edge machines, and rib machines. They are generally divided into three-line, four-line, and five-line machines. The main function is generally to prevent the seams of clothing from fuzzing. Overlock sewing machines can not only be used for edge binding, but also for sewing T-shirts, sportswear, underwear, knitwear and other fabrics. Overlock sewing machines can cut and sew at the same time, and the seams are like mesh, which is also suitable for elastic fabrics.

[0003] The existing overlock sewing machine is provided with a thread cutting device, but the existing thread cutting device of the overlock sewing machine usually needs to be controlled by a manual operation button, which is troublesome to operate. If the movable knife and the fixed knife in the thread cutting device of the overlock sewing machine are engaged too tightly, it is difficult to bounce back to the original position. If the movable knife and the fixed knife are engaged too loosely, the suture cannot be cut. Utility Model Content

[0004] The utility model aims to provide a thread cutting device for an overlock sewing machine for sewing garments, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a thread cutting device of a garment sewing overlock machine, comprising a thread cutting bracket, a thread cutting structure and a driving assembly, wherein two thread cutting structures are arranged in the thread cutting bracket, and the two thread cutting structures are symmetrically arranged in an upper and lower manner, and a driving assembly is arranged on the two thread cutting structures, and the thread cutting structure comprises a crankshaft, a movable plate, two connecting rods, a connecting assembly and a thread cutting knife, the crankshaft is rotatably connected to the left and right sides of the bracket respectively, two slide grooves are provided on the left and right sides of the thread cutting bracket, and a movable plate is slidably connected between the two slide grooves, one end of the two connecting rods is movably connected to the raised end of the crankshaft, and the other end of the two connecting rods is movably connected to the top of the movable plate, and the bottom of the movable plate is connected to the thread cutting knife through a connecting assembly.

[0006] Preferably, the driving assembly includes a fixed frame, a rotating shaft, a motor, a first bevel gear and a second bevel gear. The fixed frame is arranged on the right side outside the tangent bracket, and the rotating shaft is rotatably connected to the top and bottom of the fixed frame respectively. The motor is arranged at the top outside the fixed frame, and the driving end of the motor is connected to the top of the rotating shaft. The first bevel gear is arranged on the rotating shaft, and the second bevel gear is arranged at one end of the crankshaft, and the second bevel gear is meshed with the first bevel gear.

[0007] Preferably, the connecting assembly includes a connecting frame and a bolt, the connecting frame is arranged at the bottom of the movable plate, the top of the wire cutter is movably inserted into the connecting frame, the bolt is threadedly connected to the front side of the connecting frame, and one end of the bolt is against the front side of the wire cutter.

[0008] Preferably, the crankshaft and the tangent bracket are connected via a bearing, an inner ring of the bearing and the crankshaft are interference fit, and an outer ring of the bearing and the crankshaft are fixedly connected.

[0009] Preferably, a gasket is provided between the bolt and the outer front side of the connecting frame.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model replaces the traditional tangent device with two tangent structures symmetrically arranged up and down, and the new tangent structure adopts the crankshaft connecting rod drive mode to achieve faster and more stable tangent action. Compared with the traditional tangent device, the new tangent structure has a higher tangent rate and a more reliable tangent effect. At the same time, the two tangent structures are driven by only one motor, which greatly improves the tangent efficiency and reduces the waiting and switching time, thereby improving the working efficiency of the entire overlock sewing machine. The tangent knife can be quickly replaced by installing the assembly, which is convenient for the staff to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the main structure of the utility model in the initial state;

[0012] Figure 2 This is a schematic diagram of the main structure of the utility model in a tangent state;

[0013] Figure 3 It is a side structural schematic diagram of the connection assembly of the utility model.

[0014] In the figure: 1. tangent bracket; 2. tangent structure; 21. crankshaft; 22. moving plate; 23. connecting rod; 24. connecting assembly; 25. tangent knife; 24-1. connecting frame; 24-2. bolt; 24-3. gasket; 3. driving assembly; 31. fixing frame; 32. rotating shaft; 33. motor; 34. first bevel gear; 35. second bevel gear. DETAILED DESCRIPTION

[0015] 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.

[0016] See also Figure 1-3The utility model provides a thread cutting device for an overlock sewing machine for sewing clothing, comprising a thread cutting bracket 1, a thread cutting structure 2 and a driving assembly 3. The thread cutting bracket 1 is a rectangular bracket with front and rear openings, and the thread cutting bracket 1 replaces the traditional thread cutting device and is arranged at the thread cutting position of the overlock sewing machine. Two thread cutting structures 2 are arranged in the thread cutting bracket 1, and the two thread cutting structures 2 are arranged symmetrically up and down. The two thread cutting structures 2 are respectively an upper thread cutting structure 2 and a lower thread cutting structure 2. The two thread cutting structures 2 are provided with a driving assembly 3, and the driving assembly 3 is used to drive the two thread cutting structures 2 to perform thread cutting work. The thread cutting structure 2 comprises a crankshaft 21, a moving plate 22, two connecting rods 23, a connecting assembly 3, and a connecting rod 24. The tangent bracket 1 has two slide grooves on its left and right sides, and a movable plate 22 is slidably connected between the two slide grooves. One end of the two connecting rods 23 is movably connected to the raised end of the crankshaft 21, and the other end of the two connecting rods 23 is movably connected to the top of the movable plate 22. The bottom of the movable plate 22 is connected to the wire cutter 25 through a connecting assembly 24. The connecting assembly 24 can install and disassemble the wire cutter 25. The raised end of the crankshaft 21 of the upper tangent structure 2 is in an upward state in the initial state, and the raised end of the crankshaft 21 of the lower tangent structure 2 is in a downward state in the initial state.

[0017] Specifically, the driving assembly 3 includes a fixed frame 31, a rotating shaft 32, a motor 33, a first bevel gear 34 and a second bevel gear 35. The fixed frame 31 is arranged on the right side outside the tangent bracket 1, and the rotating shaft 32 is rotatably connected to the top and bottom of the fixed frame 31 respectively. The motor 33 is arranged at the top outside the fixed frame 31, and the driving end of the motor 33 is connected to the top of the rotating shaft 32. The first bevel gear 34 is arranged on the rotating shaft 32, and the second bevel gear 35 is arranged at one end of the crankshaft 21, and the second bevel gear 35 is meshed with the first bevel gear 34. The number of the first bevel gear 34 and the second bevel gear 35 are both two. Under the drive of the driving assembly 3, the crankshafts 21 of the two tangent structures 2 rotate in the same direction, and the angle of rotation of the crankshaft 21 each time is 360 degrees.

[0018] Specifically, the connecting assembly 24 includes a connecting frame 24-1 and a bolt 24-2. The connecting frame 24-1 is arranged at the bottom of the movable plate 22. The top of the wire cutter 25 is movably inserted into the connecting frame 24-1. The bolt 24-2 is threadedly connected to the front side of the connecting frame 24-1, and one end of the bolt 24-2 is against the front side of the wire cutter 25.

[0019] When replacing the wire cutter 25, the staff screws the bolt 24-2 outward to separate the bolt 24-2 from the wire cutter 25. At this time, the wire cutter 25 will be detached from the connecting frame 24-1. Then, the new wire cutter 25 is inserted into the connecting frame 24-1 and the bolt 24-2 is screwed inward to fix the new wire cutter 25 in the connecting frame 24-1.

[0020] Specifically, the crankshaft 21 is connected to the tangent bracket 1 via a bearing, the inner ring of the bearing is interference fit with the crankshaft 21 , and the outer ring of the bearing is fixedly connected to the crankshaft 21 .

[0021] Specifically, a gasket 24 - 3 is provided between the bolt 24 - 2 and the outer front side of the connecting frame 24 - 1 , and the gasket 24 - 3 improves the connection strength between the bolt 24 - 2 and the connecting frame 24 - 1 .

[0022] Working principle: During operation, the driving end of the motor 33 will drive the rotating shaft 32 and the first bevel gear 34 to rotate, the first bevel gear 34 will drive the second bevel gear 35 meshing therewith to rotate, the second bevel gear 35 will synchronously drive the crankshaft 21 in the upper tangent structure 2 and the crankshaft 21 in the lower tangent structure 2 to rotate, when the crankshaft 21 rotates, it will drive one end of the connecting rod 23 to rotate, the other end of the connecting rod 23 will push the moving plate 22, the moving plate 22 will drive the wire cutter 25 to move toward the thread end, so that the wire cutters 25 in the two tangent structures 2 are close to each other, and then the wire ends are cut.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thread cutting device for an overlock sewing machine for sewing garments, characterized in that: The invention comprises a tangent bracket (1), a tangent structure (2) and a driving assembly (3). The tangent bracket (1) is provided with two tangent structures (2), and the two tangent structures (2) are symmetrically arranged in an upper and lower direction. The two tangent structures (2) are provided with a driving assembly (3). The tangent structure (2) comprises a crankshaft (21), a movable plate (22), two connecting rods (23), a connecting assembly (24) and a tangent knife (25). The crankshaft (21) is rotatably connected to the left and right sides of the bracket respectively. Two sliding grooves are provided on the left and right sides of the tangent bracket (1). The movable plate (22) is slidably connected between the two sliding grooves. One end of the two connecting rods (23) is movably connected to the protruding end of the crankshaft (21), and the other end of the two connecting rods (23) is movably connected to the top of the movable plate (22). The bottom of the movable plate (22) is connected to the tangent knife (25) through the connecting assembly (24).

2. The thread cutting device of a garment sewing overlock machine according to claim 1, characterized in that: The driving assembly (3) comprises a fixed frame (31), a rotating shaft (32), a motor (33), a first bevel gear (34) and a second bevel gear (35); the fixed frame (31) is arranged on the right side outside the tangent bracket (1); the rotating shaft (32) is rotatably connected to the top and bottom of the fixed frame (31) respectively; the motor (33) is arranged on the top outside the fixed frame (31), and the driving end of the motor (33) is connected to the top of the rotating shaft (32); the first bevel gear (34) is arranged on the rotating shaft (32); the second bevel gear (35) is arranged at one end of the crankshaft (21), and the second bevel gear (35) is meshed with the first bevel gear (34).

3. The thread cutting device of a garment sewing overlock machine according to claim 2, characterized in that: The connecting assembly (24) comprises a connecting frame (24-1) and a bolt (24-2); the connecting frame (24-1) is arranged at the bottom of the movable plate (22); the top of the wire cutter (25) is movably inserted into the connecting frame (24-1); the bolt (24-2) is threadedly connected to the front side of the connecting frame (24-1), and one end of the bolt (24-2) abuts against the front side of the wire cutter (25).

4. The thread cutting device of a garment sewing overlock machine according to claim 2, characterized in that: The crankshaft (21) and the tangent support (1) are connected via a bearing, an inner ring of the bearing and the crankshaft (21) are interference fit, and an outer ring of the bearing and the crankshaft (21) are fixedly connected.

5. The thread cutting device of a garment sewing overlock machine according to claim 3, characterized in that: A gasket (24-3) is provided between the bolt (24-2) and the outer front side of the connecting frame (24-1).

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