Thread trimming mechanism and sewing machine

Abstract

The utility model provides a kind of thread trimming mechanism and sewing machine, belong to sewing equipment technical field.The thread trimming mechanism of the utility model includes mounting seat, and the movable cutter one and movable cutter two that can all rotate are provided on mounting seat, and the thread trimming mechanism further includes motor one and motor two, and the connecting rod assembly one for driving movable cutter one rotation is provided on motor one, and the connecting rod assembly two for driving movable cutter two rotation is provided on motor two.The movable cutter one and movable cutter two of the thread trimming mechanism are driven by different driving sources and connecting rod assembly respectively, two movable cutters do not affect each other when rotating, and automatic thread trimming can be completed by mutual cooperation.

Description

Technical Field

[0001] This utility model belongs to the field of sewing equipment technology, and relates to a thread-cutting mechanism and a sewing machine. Background Technology

[0002] The thread-cutting mechanism of existing sewing machines generally consists of a fixed blade, a moving blade, a connecting rod, and a drive shaft. The fixed blade is fixedly mounted on the machine housing, and the moving blade is mounted on the moving blade holder. The drive shaft drives the connecting rod, which in turn drives the moving blade holder, causing the moving blade to move toward the fixed blade to cut the thread.

[0003] Some thread-cutting mechanisms include two moving blades and a driving component that can rotate in opposite directions. For example, the thread-cutting mechanism of a sewing machine provided in patent document with application number 201710451937.4, in which the thread-cutting mechanism drives the linkage mechanism by swinging the thread-cutting drive shaft, thereby realizing the engagement of the active blade and the auxiliary blade and completing the thread-cutting action.

[0004] The aforementioned wire-cutting mechanism uses a drive source to rotate two moving blades to cut the wire. However, designing wire-cutting mechanisms with different structures to achieve automatic wire cutting is an inevitable requirement for technological innovation. Summary of the Invention

[0005] This utility model addresses the aforementioned problems in the existing technology by providing a wire-cutting mechanism. The technical problem to be solved by this utility model is: how to automatically cut wires.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A wire-cutting mechanism includes a mounting base on which two rotatable movable blades, a first movable blade and a second movable blade, are mounted. The mechanism further includes a first motor and a second motor. The first motor has a first connecting rod assembly for driving the first movable blade to rotate, and the second motor has a second connecting rod assembly for driving the second movable blade to rotate.

[0008] Its working principle is as follows: When in use, motor one and motor two are installed on the sewing machine's worktable. Motor one drives the moving blade one to rotate through the connecting rod assembly one, and motor two drives the moving blade two to rotate through the connecting rod assembly two. When the moving blade one and moving blade two rotate towards each other and mesh, they automatically cut the thread. After the thread is cut, motor one and motor two drive the moving blade one and moving blade two to rotate in opposite directions, driving the moving blade one and moving blade two away from each other and separating.

[0009] The first and second moving blades of this wire cutting mechanism are driven by different drive sources and linkage assemblies. The two moving blades do not affect each other when they rotate, and they can cooperate with each other to complete automatic wire cutting.

[0010] In the aforementioned thread-cutting mechanism, a rotatable rotating ring is provided on the mounting base, a moving blade is mounted on the edge of the rotating ring, the connecting rod assembly includes a connecting rod, a connecting rod, and a rocker arm, a crank is mounted on the output shaft of the motor, one end of the rocker arm is hinged to the sewing machine's worktable, the connecting rod and the connecting rod are respectively hinged to the other end of the rocker arm, one end of the connecting rod is hinged to the edge of the rotating ring, and one end of the connecting rod is hinged to the crank.

[0011] The output shaft of motor one drives connecting rod two to swing, connecting rod two drives swing rod one to rotate, swing rod one drives connecting rod one to swing, connecting rod one drives rotating ring one to rotate, and moving blade one rotates with rotating ring one.

[0012] In the aforementioned thread-cutting mechanism, a connecting block is installed on the sewing machine's worktable, and one end of the swing arm is hinged to the connecting block.

[0013] In this structure, the swing arm is hinged to the sewing machine's worktable via a connecting block.

[0014] In the above-mentioned wire cutting mechanism, a rotatable rotating ring two is provided on the mounting base, the moving blade two is installed on the edge of the rotating ring two, the connecting rod assembly two includes connecting rod three, connecting rod four and connecting rod five, one end of connecting rod three is connected to the output shaft of motor two, the other end of connecting rod three is hinged to connecting rod four, a connecting shaft is connected to one end of connecting rod four, a crank two is installed on the connecting shaft, connecting rod five is hinged to the crank two, and one end of connecting rod five is hinged to the edge of the rotating ring two.

[0015] The output shaft of motor two drives connecting rod three to swing, connecting rod two drives connecting rod four to swing, connecting rod four drives connecting rod five to swing through connecting shaft, connecting rod five drives rotating ring two to rotate, and moving blade two rotates with rotating ring two.

[0016] In the above-mentioned wire cutting mechanism, the first moving blade has a groove, and the second moving blade has an outwardly extending pressing part, which can abut against the groove wall.

[0017] During operation, motor one and motor two drive moving blade one and moving blade two to rotate in opposite directions, respectively. After the machine needle sews the first stitch on the fabric, when the pressing part on moving blade two abuts against the groove wall, the pressing part presses the thread end tightly onto the groove. Then the machine needle sews another stitch on the fabric. After that, motor one and motor two drive moving blade one and moving blade two to continue rotating and meshing, and moving blade one and moving blade two cut the thread end. Then motor one and motor two drive moving blade one and moving blade two to rotate in opposite directions, and moving blade one and moving blade two gradually separate. At this time, the pressing part gradually detaches from the groove wall. At this point, two to three stitches have been sewn on the fabric. The pressing part no longer needs to press the thread and will not come loose, so normal sewing can be carried out.

[0018] The quilting part and the groove form the quilting structure. The quilting part and the groove are respectively set on the second moving blade and the first moving blade. During the process of the second moving blade cutting the thread end, the first moving blade and the second moving blade can press the thread down by themselves to prevent the thread from coming off when starting to sew. There is no need to set up additional quilting pieces or other structures. The quilting and cutting are completed with a simplified structure.

[0019] In the aforementioned wire-cutting mechanism, the wire-pressing part is elongated and extends towards the moving blade.

[0020] The elongated, strip-shaped creasing section saves material and easily produces slight elastic deformation, elastically pressing the thread for better creasing.

[0021] This utility model also provides a sewing machine, which includes any of the above-mentioned thread-cutting mechanisms.

[0022] Compared with the prior art, the advantages of this utility model are as follows:

[0023] 1. The first and second moving blades of this wire cutting mechanism are driven by different drive sources and linkage assemblies. The two moving blades do not affect each other when they rotate, and they can cooperate with each other to complete automatic wire cutting.

[0024] 2. The pressing part and groove of this thread cutting mechanism are respectively set on the second moving blade and the first moving blade. During the process of the first moving blade and the second moving blade cutting the thread end, the first moving blade and the second moving blade can press the thread to prevent the thread from coming off when starting to sew. The pressing and cutting of the thread are completed with the simplified structure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the wire-cutting mechanism. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the wire-cutting mechanism. Figure 2 ;

[0027] Figure 3 This is a schematic diagram of the wire-cutting mechanism installed on the workbench;

[0028] Figure 4 This is a structural schematic diagram of the moving blade;

[0029] Figure 5 This is a schematic diagram of the second moving blade.

[0030] In the diagram: 1 Mounting base, 2 Moving blade one, 3 Moving blade two, 4 Motor one, 5 Motor two, 6 Linkage assembly one, 7 Linkage assembly two, 8 Rotary ring one, 9 Link one, 10 Link two, 11 Swing arm one, 12 Crank one, 13 Connecting block, 14 Rotary ring two, 15 Link three, 16 Link four, 17 Link five, 18 Connecting shaft, 19 Crank two, 20 Worktable, 21 Groove, 22 Pressing part. Detailed Implementation

[0031] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] like Figure 1-3 As shown, this wire cutting mechanism includes a mounting base 1, on which are mounted a rotating blade 2 and a rotating blade 3. The wire cutting mechanism also includes a motor 4 and a motor 5. The motor 4 is equipped with a connecting rod assembly 6 for driving the rotating blade 2 to rotate, and the motor 5 is equipped with a connecting rod assembly 7 for driving the rotating blade 3 to rotate.

[0033] In use, motor 4 and motor 5 are installed on the sewing machine's worktable 20. Motor 4 drives the moving blade 2 to rotate through the connecting rod assembly 6, and motor 5 drives the moving blade 3 to rotate through the connecting rod assembly 7. When the moving blades 2 and 3 rotate towards each other and mesh, they automatically cut the thread. After the thread is cut, motor 4 and motor 5 drive the moving blades 2 and 3 to rotate in opposite directions, driving them to move away from each other and separate.

[0034] like Figure 1 As shown, in this embodiment, a rotatable rotating ring 8 is provided on the mounting base 1, and a moving blade 2 is installed on the edge of the rotating ring 8. The connecting rod assembly 6 includes a connecting rod 9, a connecting rod 10, and a rocker arm 11. A crank 12 is installed on the output shaft of the motor 4. One end of the rocker arm 11 is hinged to the sewing machine's worktable 20. The connecting rod 9 and the connecting rod 10 are respectively hinged to the other end of the rocker arm 11. One end of the connecting rod 9 is hinged to the edge of the rotating ring 8, and one end of the connecting rod 10 is hinged to the crank 12.

[0035] The output shaft of motor 4 drives connecting rod 2 10 to swing, connecting rod 2 10 drives swing rod 1 11 to rotate, swing rod 1 11 drives connecting rod 9 to swing, connecting rod 9 drives rotating ring 8 to rotate, and moving blade 2 rotates with rotating ring 8.

[0036] like Figure 1 and 3 As shown, in this embodiment, a connecting block 13 is installed on the sewing machine's worktable 20, and one end of the swing arm 11 is hinged to the connecting block 13. In this structure, the swing arm 11 is hinged to the sewing machine's worktable 20 via the connecting block 13.

[0037] like Figure 2 As shown, in this embodiment, a rotatable rotating ring 14 is provided on the mounting base 1, and a moving blade 3 is installed on the edge of the rotating ring 14. The connecting rod assembly 7 includes a connecting rod 15, a connecting rod 16, and a connecting rod 17. One end of the connecting rod 15 is connected to the output shaft of the motor 5, and the other end of the connecting rod 15 is hinged to the connecting rod 16. A connecting shaft 18 is connected to one end of the connecting rod 16, and a crank 19 is installed on the connecting shaft 18. The connecting rod 17 is hinged to the crank 19, and one end of the connecting rod 17 is hinged to the edge of the rotating ring 14.

[0038] The output shaft of motor 25 drives connecting rod 315 to swing, connecting rod 315 drives connecting rod 416 to swing, connecting rod 416 drives connecting rod 517 to swing through connecting shaft 18, connecting rod 517 drives rotating ring 214 to rotate, and moving blade 23 rotates with rotating ring 214.

[0039] like Figure 4 and 5 As shown, in this embodiment, the first moving blade 2 has a groove 21, and the second moving blade 3 has an outwardly extending pressing part 22, which can abut against the groove wall of the groove 21.

[0040] During operation, motor 4 and motor 5 drive moving blades 2 and 3 to rotate in opposite directions, respectively. After the machine needle sews the first stitch on the fabric, when the pressing part 22 on moving blade 3 abuts against the groove wall of groove 21, the pressing part 22 presses the thread end tightly onto groove 21. Then the machine needle sews another stitch on the fabric. Afterward, motor 4 and motor 5 drive moving blades 2 and 3 to continue rotating and meshing, and moving blades 2 and 3 cut the thread end. Then, motor 4 and motor 5 drive moving blades 2 and 3 to rotate in opposite directions, and moving blades 2 and 3 gradually separate. At this time, the pressing part 22 gradually detaches from the groove wall of groove 21. At this point, two to three stitches have been sewn on the fabric. The pressing part 22 no longer needs to press the thread and will not come loose, so normal sewing can be carried out.

[0041] The pressing part 22 and the groove 21 form a pressing structure. The pressing part 22 and the groove 21 are respectively set on the moving blade 2 3 and the moving blade 1 2. During the process of the moving blade and the moving blade 2 3 cutting the thread end, the moving blade 1 2 and the moving blade 2 3 can press the thread down themselves to prevent the thread from coming off when starting to sew. There is no need to set up additional pressing pieces or other structures. Pressing and cutting the thread can be carried out with a simplified structure.

[0042] like Figure 5 As shown, in this embodiment, the pressure part 22 is elongated and extends toward the moving blade 2.

[0043] The elongated pressing section 22 saves materials and easily produces slight elastic deformation, which elastically presses the thread for better pressing.

[0044] This utility model also provides a sewing machine, which includes any of the above-mentioned thread-cutting mechanisms.

[0045] 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 wire-cutting mechanism, the wire-cutting mechanism comprising a mounting base (1), wherein the mounting base (1) is provided with a rotatable moving blade one (2) and a moving blade two (3), characterized in that, The wire cutting mechanism also includes a first motor (4) and a second motor (5). The first motor (4) is provided with a first link assembly (6) for driving the first moving blade (2) to rotate, and the second motor (5) is provided with a second link assembly (7) for driving the second moving blade (3) to rotate.

2. The wire-cutting mechanism according to claim 1, characterized in that, The mounting base (1) is provided with a rotatable rotating ring (8), the moving blade (2) is installed on the edge of the rotating ring (8), the connecting rod assembly (6) includes a connecting rod (9), a connecting rod (10) and a rocker arm (11), the output shaft of the motor (4) is equipped with a crank (12), one end of the rocker arm (11) is hinged to the sewing machine table (20), the connecting rod (9) and the connecting rod (10) are respectively hinged to the other end of the rocker arm (11), one end of the connecting rod (9) is hinged to the edge of the rotating ring (8), and one end of the connecting rod (10) is hinged to the crank (12).

3. A wire-cutting mechanism according to claim 2, characterized in that, A connecting block (13) is installed on the worktable (20) of the sewing machine, and one end of the swing arm (11) is hinged to the connecting block (13).

4. A wire-cutting mechanism according to claim 1, characterized in that, The mounting base (1) is provided with a rotatable rotating ring two (14), the moving blade two (3) is installed on the edge of the rotating ring two (14), the connecting rod assembly two (7) includes connecting rod three (15), connecting rod four (16) and connecting rod five (17), one end of the connecting rod three (15) is connected to the output shaft of motor two (5), and the other end of the connecting rod three (15) is hinged to the connecting rod four (16). A connecting shaft (18) is connected to one end of the connecting rod four (16), a crank two (19) is installed on the connecting shaft (18), and a connecting rod five (17) is hinged on the crank two (19). One end of the connecting rod five (17) is hinged to the edge of the rotating ring two (14).

5. A wire-cutting mechanism according to claim 1, 2, 3, or 4, characterized in that, The first moving blade (2) has a groove (21), and the second moving blade (3) has an outwardly extending pressing part (22), which can abut against the groove wall of the groove (21).

6. A wire-cutting mechanism according to claim 5, characterized in that, The pressure part (22) is elongated and extends toward the moving knife (2).

7. A sewing machine, characterized in that, The sewing machine includes a thread-cutting mechanism as described in any one of claims 1-6.

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