Thread trimming movable cutter of sewing machine and sewing machine with thread trimming movable cutter

Abstract

The thread trimming moving knife comprises a moving blade (1), a thread trimming and separating tip part (11) is arranged at the front end of the moving blade (1), a first notch (111) is formed in the thread trimming and separating tip part (11), a left thread separating part (112) and a right thread separating part (113) are arranged on the two sides of the first notch (111) respectively, the vertical distance a from the top end of the right thread separating part (113) to the innermost end of the first notch (111) is larger than or equal to 3mm and smaller than or equal to 10mm, and a is larger than or equal to 3mm and smaller than or equal to 10mm. The vertical distance from the top end of the left branching part (112) to the top end of the right branching part (113) is c, and c is larger than or equal to 2mm and smaller than or equal to 6mm. A first notch which is concaved forwards is formed between the thread cutting and separating sharp parts, on the premise that thread loosening is avoided, the length of a residual thread end of an upper thread is effectively controlled to be about 20 mm after thread cutting, and a pile of thread ends cannot be embedded in cloth when sewing is conducted again.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine parts especially sewing machine's thread cutting moving knife and sewing machine thereof. BACKGROUND

[0002] Thread cutting mechanism is one of important components in sewing machine, thread cutting mechanism generally includes moving knife and fixed knife, moving knife rotates to fixed knife, realizes thread cutting function, moving knife mainly includes moving knife piece, the front end of moving knife piece will be equipped with the notch for thread separation, for example, the publication number CN219342521U a kind of moving knife structure, this "V" shape notch can make the length of thread residual stub after thread cutting too long, when sewing again, there will be a bunch of stubs buried into cloth, simultaneously also reduce sewing efficiency. SUMMARY

[0003] The utility model provides sewing machine's thread cutting moving knife and sewing machine thereof in view of the shortcoming in prior art.

[0004] In order to solve above-mentioned technical problem, the utility model solves by following technical scheme:

[0005] Sewing machine's thread cutting moving knife, including moving knife piece, moving knife piece front end is equipped with thread cutting thread separation tip, thread cutting thread separation tip is equipped with first notch, the left thread separation part and right thread separation part are respectively on the two sides of first notch, the vertical distance of right thread separation part top end to first notch innermost end is a, 3mm≤a≤10mm, the vertical distance of left thread separation part top end to right thread separation part top end is c, 2mm≤c≤6mm.

[0006] As preferred, the vertical distance of right thread separation part top end to left thread separation part side wall is b, 2mm≤b≤6mm.

[0007] As preferred, the angle of two sides of first notch is alpha, 30°≤alpha≤65°.

[0008] As preferred, thread cutting thread separation tip is equipped with second notch, one side wall of second notch is the side wall of left thread separation part, the vertical distance of second notch innermost end and first notch innermost end is d, 0.3mm≤d≤3mm.

[0009] As preferred, first notch is "U" shape notch.

[0010] As preferred, moving knife piece is equipped with the moving knife edge of upward protruding.

[0011] Sewing machine, including fixed knife: still including sewing machine's thread cutting moving knife, thread cutting moving knife rotates towards fixed knife, moving knife edge and fixed knife's fixed knife edge cooperate and realize thread cutting.

[0012] The utility model has remarkable technical effect because of adopting above technical scheme:

[0013] (1) the first gap formed between the thread cutting and separating tips is concave forward, under the premise of ensuring that the thread does not come off, the length of the remaining thread end of the face thread after thread cutting is effectively controlled at about 20 mm, and when sewing again, a pile of thread ends will not be buried on the cloth.

[0014] (2) the blade edge of the moving knife and the blade edge of the fixed knife can cut the face thread and the bottom thread at the same time, facilitating secondary sewing and providing sewing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a schematic view of the structure of the moving knife.

[0016] Fig. 2 is a schematic view of the size structure of the moving knife.

[0017] Fig. 3 is a schematic view of the cooperation structure of the moving knife and the fixed knife.

[0018] The part names referred to by the respective numbers in the above drawings are as follows:

[0019] 1 - moving knife blade, 11 - thread cutting and separating tip, 12 - moving knife blade edge, 111 - first gap, 112 - left thread separating part, 113 - right thread separating part, 114 - second gap

[0020] 2 - fixed knife DETAILED DESCRIPTION

[0021] The utility model will be further described in detail below in combination with the accompanying drawings and examples. Figs. 1-3 The utility model will be further described in detail below in combination with the accompanying drawings and examples.

[0022] Example 1

[0023] The thread cutting moving knife of the sewing machine comprises a moving knife blade 1, the front end of the moving knife blade 1 is provided with a thread cutting and separating tip 11, the thread cutting and separating tip 11 is provided with a first gap 111, the left thread separating part 112 and the right thread separating part 113 are respectively arranged on the two sides of the first gap 111, that is, the first gap 111 is formed between the left thread separating part 112 and the right thread separating part 113, and the first gap is used for separating threads and facilitating thread cutting. The vertical distance from the top end of the right thread separating part 113 to the innermost end of the first gap 111 is a, and 3 mm≤a≤10 mm, a is 6.5 mm. The vertical distance from the top end of the left thread separating part 112 to the top end of the right thread separating part 113 is c, and 2 mm≤c≤6 mm, c is 4 mm. The first gap 111 formed between the thread cutting and separating tips 11 is concave forward, under the premise of ensuring that the thread does not come off, the length of the remaining thread end of the face thread after thread cutting is effectively controlled at about 20 mm, and when sewing again, a pile of thread ends will not be buried on the cloth.

[0024] The vertical distance from the top end of the right thread separation portion 113 to the side wall of the left thread separation portion 112 is b, 2mm≤b≤6mm, b is 4mm, when the cutting thread moving knife rotates, the thread will be brought into the innermost end of the first gap 111, so that the length of the residual thread head of the surface thread is effectively controlled at about 20mm after the thread is cut.

[0025] The included angle of the two side walls of the first gap 111 is α, 30°≤α≤65°, α is 47.5°, the first gap 111 at this angle is easy to separate threads and will not easily come off.

[0026] The second gap 114 of the thread cutting and separating sharp portion 11 is V-shaped, one side wall of the second gap 114 is the side wall of the left thread separation portion 112, and the vertical distance from the innermost end of the second gap 114 to the innermost end of the first gap 111 is d, 0.3mm≤d≤3mm, d is 1.65mm.

[0027] The first gap 111 is a "U" shaped gap.

[0028] The moving knife blade 1 is provided with an upwardly protruding moving knife edge 12, which cooperates with the fixed knife 2 to realize the thread cutting function. The moving knife edge 12 cooperates with the edge of the fixed knife 2 to cut the surface thread and the bottom thread at the same time, which facilitates secondary sewing and provides sewing efficiency.

[0029] Example 2

[0030] Example 2 has basically the same characteristics as Example 1, except that the vertical distance from the top end of the right thread separation portion 113 to the innermost end of the first gap 111 is a, 3mm≤a≤10mm, a is 3mm, and the vertical distance from the top end of the left thread separation portion 112 to the top end of the right thread separation portion 113 is c, 2mm≤c≤6mm, c is 2mm.

[0031] The vertical distance from the top end of the right thread separation portion 113 to the side wall of the left thread separation portion 112 is b, 2mm≤b≤6mm, b is 3mm.

[0032] The included angle of the two side walls of the first gap 111 is α, 30°≤α≤65°, α is 30°

[0033] The vertical distance from the innermost end of the second gap 114 to the innermost end of the first gap 111 is d, 0.3mm≤d≤3mm, d is 0.3mm.

[0034] Example 3

[0035] Example 3 has basically the same characteristics as Example 1, except that the vertical distance from the top end of the right thread separation portion 113 to the innermost end of the first gap 111 is a, 3mm≤a≤10mm, a is 10mm, and the vertical distance from the top end of the left thread separation portion 112 to the top end of the right thread separation portion 113 is c, 2mm≤c≤6mm, c is 6mm.

[0036] The vertical distance from the top end of the right split 113 to the side wall of the left split 112 is b, 2mm≤b≤6mm, and b is 6mm.

[0037] The included angle of the two side walls of the first gap 111 is α, 30°≤α≤65°, and α is 65°.

[0038] The vertical distance from the innermost end of the second gap 114 to the innermost end of the first gap 111 is d, 0.3mm≤d≤3mm, and d is 3mm.

[0039] Example 4

[0040] Sewing machine, comprising a fixed knife 2 and the thread cutting knife of the sewing machine in example 1 or 2 or 3, the thread cutting knife rotates towards the fixed knife 2, the knife edge 12 cooperates with the fixed knife edge of the fixed knife 2 and realizes thread cutting.

Claims

1. A thread cutting knife of a sewing machine, comprising a knife blade (1), the front end of the knife blade (1) is provided with a thread cutting and separating tip (11), the thread cutting and separating tip (11) is provided with a first gap (111), the left and right sides of the first gap (111) are respectively a left thread separating part (112) and a right thread separating part (113), characterized in that: The vertical distance from the top end of the right thread separation part (113) to the innermost end of the first gap (111) is a, and 3mm≤a≤10mm. The vertical distance from the top end of the left thread separation part (112) to the top end of the right thread separation part (113) is c, and 2mm≤c≤6mm.

2. The thread-trimming knife of a sewing machine according to claim 1, characterized in that: The vertical distance from the top end of the right thread separation part (113) to the side wall of the left thread separation part (112) is b, and 2mm≤b≤6mm.

3. The thread-trimming knife of a sewing machine according to claim 1, characterized in that: The included angle of the two side walls of the first gap (111) is α, and 30°≤α≤65°.

4. The thread-trimming knife of a sewing machine according to claim 1, characterized in that: The thread cutting thread separation tip (11) is provided with a second gap (114). One side wall of the second gap (114) is the side wall of the left thread separation part (112). The vertical distance from the innermost end of the second gap (114) to the innermost end of the first gap (111) is d, and 0.3mm≤d≤3mm.

5. The thread-trimming knife of a sewing machine according to claim 1, characterized in that: The first gap (111) is a "U" shaped gap.

6. A thread-trimming knife for a sewing machine according to any one of claims 1-5, characterized in that: The moving blade (1) is provided with an upwardly protruding moving blade edge (12).

7. Sewing machine comprising a fixed knife (2), characterized in that: The sewing machine thread cutting moving blade of claim 6 is further provided, and the thread cutting moving blade rotates towards the fixed blade (2). The moving blade edge (12) cooperates with the fixed blade edge of the fixed blade (2) to achieve thread cutting.

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