CN218969538U

CN218969538U - Adjusting and fixing device for branching sheet in thread cutting mechanism of sewing machine and sewing machine

Info

Publication number: CN218969538U
Application number: CN202223414635.5U
Authority: CN
Inventors: 谭新民; 李保青; 张军利
Original assignee: Jack Technology Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-05-05
Anticipated expiration: 2032-12-19

Abstract

The utility model provides an adjusting and fixing device of a branching sheet in a sewing machine thread cutting mechanism and a sewing machine, which are suitable for the sewing machine thread cutting mechanism, wherein the sewing machine thread cutting mechanism comprises a machine shell, a movable cutter, a fixed cutter and the branching sheet, the fixed cutter and the branching sheet are fixed on the machine shell, the movable cutter is rotatably connected to the machine shell, and the movable cutter is meshed with the fixed cutter to cut threads; the device comprises an adjusting and fixing assembly, wherein the adjusting and fixing assembly is in butt joint with the branching sheet and is used for adjusting the position of the branching sheet in the vertical direction. The utility model adjusts the position of the branching piece in the vertical direction, avoids the branching piece from being bumped in the moving process of the movable knife, does not change the elasticity of the branching piece, keeps the bottom line clamping effect of the branching piece and the fixed knife, and ensures the stability and the sewing performance of the sewing machine. In addition, the precision of the branching sheet is reduced by adopting the adjusting and fixing assembly, the probability of defective products caused by deformation of the branching sheet in the heat treatment process is reduced, and the difficulty of assembly and adjustment is reduced.

Description

Adjusting and fixing device for branching sheet in thread cutting mechanism of sewing machine and sewing machine

Technical Field

The utility model relates to the technical field of clothing production equipment, in particular to an adjusting and fixing device for a branching piece in a sewing machine thread cutting mechanism and a sewing machine.

Background

The flat seaming machine mainly comprises a thread taking-up mechanism, a cloth needling mechanism, a thread hooking mechanism, a feeding mechanism, a thread shearing mechanism and the like. The wire cutting mechanism generally includes: the movable knife, the fixed knife and the branching blade of the thread cutting mechanism are abutted against the rotating shuttle of the thread hooking mechanism, the needle plate and the teeth of the feeding mechanism in order to enable the thread head of the upper thread after thread cutting to be shorter.

For example, in the prior art, publication number CN217077998U is a thread cutting mechanism of a sewing machine, and the sewing machine, a structure, a position and a motion state of a movable blade, a fixed blade and a thread separation blade of the thread cutting mechanism are disclosed, the thread separation blade is fixed in a narrow space between the fixed blade and a rotating shuttle, during normal sewing, the movable blade is not moved away from the fixed blade, at the moment, the thread separation blade is abutted against the fixed blade, and the rotating shuttle assembly can normally rotate. When the wire is needed to be cut, the wire cutting driving mechanism is used for driving the movable knife to rotate towards the fixed knife, the movable knife can firstly contact with the fixed knife and lift the fixed knife, and under the condition that certain sizes allow, the movable knife can also be pressed on the wire dividing sheet to deform downwards, so that the movable knife and the fixed knife are meshed with each other to cut the wire. After the trimming is completed, the movable cutter is reset to leave the fixed cutter, the branching piece is abutted with the fixed cutter again under the elastic action, and the bottom thread ends are caught, so that the position stability of the bottom thread ends after trimming is ensured, the next seam starting can be effectively ensured, and the stability of the sewing performance is improved.

However, the upper and lower gaps are smaller at the position of the thread cutting mechanism due to narrow space, so that the precision requirement on the thread separation sheet is higher; the branching sheet is usually a stamping part, and the size of the branching sheet is not easy to control in the processes of bending, carburizing, quenching, tempering and the like, so that the finished product of the part often cannot meet the requirement of design precision, and correction is required to ensure the precision of the finished product of the part, but the corrected branching sheet can possibly be jacked up upwards by a passive knife, so that the passive knife is collided and bent. In the actual use process, the position of the branching piece is not well regulated.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide an adjusting and fixing device for a branching piece in a thread cutting mechanism of a sewing machine and the sewing machine, wherein the bottom thread clamping effect of the branching piece and a fixed knife is maintained by limiting the stroke of the branching piece but not changing the elasticity of the branching piece, defective products generated by deformation of the branching piece in the process of producing the branching piece are corrected, the number of defective products of the branching piece is reduced, and the difficulty of assembly and adjustment is reduced.

In order to achieve the above purpose, the utility model provides an adjusting and fixing device for a branching sheet in a sewing machine thread cutting mechanism, which is suitable for the sewing machine thread cutting mechanism, wherein the sewing machine thread cutting mechanism comprises a machine shell, a movable cutter, a fixed cutter and a branching sheet, the fixed cutter and the branching sheet are fixed on the machine shell, the movable cutter is rotatably connected to the machine shell, and the movable cutter and the fixed cutter are meshed to cut threads; the device comprises an adjusting and fixing assembly, wherein the adjusting and fixing assembly is in butt joint with the branching sheet and is used for adjusting the position of the branching sheet in the vertical direction.

Preferably, the branching piece comprises a horizontal part and an arc part, the arc part and the horizontal part are integrated, one end of the arc part, which is far away from the horizontal part, is positioned at the lower side of the moving track of the moving knife, the adjusting and fixing assembly comprises a set screw, an adjusting hole and an adjusting screw, and the horizontal part of the branching piece is fixed on the bottom surface of the casing through the set screw; the adjusting hole is formed in the machine shell, the adjusting screw is arranged in the adjusting hole, and the bottom end of the adjusting screw is abutted to the top surface of the horizontal part.

Preferably, the adjusting and fixing assembly further comprises an eccentric screw, the eccentric screw is arranged on the outer side of the adjusting screw, and an eccentric part of the eccentric screw is abutted to the adjusting screw and used for fixing the adjusting screw.

Preferably, an eccentric screw connecting hole is arranged at the outer side of the adjusting hole, and the eccentric screw is arranged in the eccentric screw connecting hole.

Preferably, the adjusting and fixing assembly further comprises a first locking screw disposed in the adjusting hole and located at an upper side of the adjusting screw.

Preferably, the length of the adjusting screw is smaller than the depth of the adjusting hole.

Preferably, the adjusting and fixing assembly further comprises a second locking screw, the second locking screw is arranged on the outer side of the adjusting hole, and a nut of the second locking screw partially covers the adjusting hole.

Preferably, a second locking screw connecting hole is formed in the outer side of the adjusting hole, an internal thread is formed in the second locking screw connecting hole, and the second locking screw is installed in the second locking screw connecting hole through threads.

Preferably, when the adjusting screw is installed in the adjusting hole and the bottom end of the adjusting screw is abutted against the top surface of the horizontal part, the top end of the adjusting screw is not lower than the top surface of the adjusting hole.

In order to achieve the above object or other objects, the present utility model also discloses a sewing machine, which includes the above adjusting and fixing device for the thread separation sheet in the thread cutting mechanism of the sewing machine.

As described above, the adjusting and fixing device for the branching piece in the thread cutting mechanism of the sewing machine and the sewing machine have the following beneficial effects:

the adjusting and fixing device for the branching piece in the thread cutting mechanism of the sewing machine and the sewing machine are characterized in that the adjusting and fixing assembly is abutted with the branching piece and used for adjusting the position of the branching piece in the vertical direction, so that the branching piece is positioned at the lower side of a moving track of the moving knife, the branching piece is prevented from being bumped in the moving process of the moving knife, the elastic force of the branching piece is not changed while the adjusting and fixing device is adopted, namely, the bottom thread clamping effect of the branching piece and the fixed knife is kept, and the stability and the sewing performance of the sewing machine are ensured. In addition, the precision of the branching sheet is reduced by adopting the adjusting and fixing assembly, the probability of defective products caused by deformation of the branching sheet in the heat treatment process is reduced, and the difficulty of assembly and adjustment is reduced.

Drawings

FIG. 1 is a sectional view showing the installation of an adjusting screw in an adjusting and fixing device of a thread-splitting sheet in a thread-cutting mechanism of a sewing machine according to the present utility model;

FIG. 2 is an exploded view of a first embodiment of the adjustment fixture for the thread-splitting blade in the thread-cutting mechanism of the sewing machine of the present utility model;

FIG. 3 is a top view of a first embodiment of an adjustment fixture for a thread take-off tab in a thread cutting mechanism of a sewing machine in accordance with the present utility model; (adjusting screw loosened state)

FIG. 4 is a top view of a first embodiment of an adjustment fixture for a thread take-off tab in a thread cutting mechanism of a sewing machine according to the present utility model; (adjusting screw locking State)

FIG. 5 is a cross-sectional view of a first embodiment of an adjustment fixture for a thread take-off tab in a thread cutting mechanism of a sewing machine in accordance with the present utility model;

fig. 6 is a space view of an eccentric screw in a first embodiment of the present utility model;

FIG. 7 is a cross-sectional view of a second embodiment of the adjustment fixture of the thread take-off tab in the thread cutting mechanism of the sewing machine of the present utility model;

FIG. 8 is an exploded view of a second embodiment of the adjustment fixture for the thread-splitting blade in the thread-cutting mechanism of the sewing machine of the present utility model;

FIG. 9 is a top view of a third embodiment of an adjustment fixture for a thread take-off tab in a thread cutting mechanism of a sewing machine according to the present utility model;

FIG. 10 is a cross-sectional view of a third embodiment of the thread-splitting adjusting and fixing device in the thread-splitting mechanism of the sewing machine of the present utility model.

Reference numerals illustrate:

1. a housing; 2. branching sheets; 21. a horizontal portion; 22. an arc-shaped portion; 3. a fixed cutter; 4. a movable knife; 5. adjusting the fixing assembly; 51. a set screw; 52. an adjusting screw; 53. a first locking screw; 54. an eccentric screw; 541. a eccentric portion; 55. a second locking screw; 6. a thread cutting tool rest.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the utility model, are included in the spirit and scope of the utility model which is otherwise, without departing from the spirit or scope thereof. Also, the terms "upper", "lower", "left", "right", "middle", "bottom", "top", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the utility model as embodied in the present utility model, but rather are intended to cover any variations or modifications in the relative terms without departing from the spirit or essential attributes thereof.

As shown in fig. 1-10, the utility model provides an adjusting and fixing device for a branching piece in a thread cutting mechanism of a sewing machine, which is suitable for the thread cutting mechanism of the sewing machine, wherein the thread cutting mechanism of the sewing machine comprises a machine shell 1, a movable cutter 4, a fixed cutter 3 and a branching piece 2, the fixed cutter 3 and the branching piece 2 are fastened on the bottom surface of the machine shell 1, the movable cutter 4 is rotatably connected to the machine shell 1, and the movable cutter 4 is meshed with the fixed cutter 3 to cut threads; the adjusting and fixing device of the branching sheet in the sewing machine thread cutting mechanism further comprises an adjusting and fixing assembly 5, wherein the bottom end of the adjusting and fixing assembly 5 is in butt joint with the top surface of the branching sheet 2 and used for adjusting the position of the branching sheet 2 in the vertical direction.

The utility model relates to an adjusting and fixing device of a branching sheet in a thread cutting mechanism of a sewing machine, which is provided with an adjusting and fixing component 5, wherein the bottom end of the adjusting and fixing component 5 is in contact with the top surface of the branching sheet 2, so that the position of the branching sheet 2 in the vertical direction is adjusted, namely, the tip of an arc-shaped part 22 of the branching sheet 2 is positioned below the movement track of a movable knife 4, the branching sheet 2 corrected by deformation after heat treatment can be utilized, and the reject ratio of the branching sheet 2 in production is reduced. On the other hand, when the deformation corrected branching piece 2 is utilized, the elasticity of the branching piece 2 is kept unchanged, so that the bottom line clamping effect of the branching piece 2 and the fixed knife 3 is kept, and the stability and the sewing performance of the sewing machine are improved.

Preferably, as shown in fig. 1, 4 and 7, the branching piece 2 includes a horizontal portion 21 and an arc portion 22, the arc portion 22 and the horizontal portion 21 are integrally formed, the left end of the arc portion 22 is integrally connected with the right end of the horizontal portion 21, the right end of the arc portion 22 is located below the movement track of the moving blade 4, the left end of the horizontal portion 21 is fixed on the bottom surface of the casing 1 through a set screw 51, and the adjusting and fixing assembly 5 is abutted against the top surface of the right end of the horizontal portion 21 from top to bottom. In this embodiment, the movable blade 4 is in transmission connection with the casing 1 through the wire cutting blade holder 6, so that the movable blade 4 and the fixed blade 3 are meshed to cut wires, and the movable blade 4, the fixed blade 3, the wire dividing piece 2 and the wire cutting blade holder 6 adopt a wire cutting mechanism with a publication number CN217077998U, but are not limited to the wire cutting mechanism. The horizontal part 21 is also provided with a waist-shaped hole, the fastening screw 51 is penetrated in the waist-shaped hole, and the bottom surface of the shell 1 is also provided with a branching sheet groove, and the horizontal part 21 of the branching sheet 2 is fixed in the branching sheet groove.

First embodiment: the adjusting and fixing assembly 5 adopts an eccentric screw 54 locking mode

Preferably, as shown in fig. 2 to 6, the adjusting and fixing assembly 5 includes an adjusting hole, an adjusting screw 52, and an eccentric screw 54, the adjusting hole is formed through the casing 1 above the horizontal portion 21, the adjusting screw 52 is disposed in the adjusting hole, the bottom end of the adjusting screw 52 abuts against the top surface of the right end of the horizontal portion 21, the eccentric screw 54 is disposed outside the adjusting screw 52, and the eccentric portion 541 of the eccentric screw 54 abuts against the adjusting screw 52 to fix the adjusting screw 52. Further, an eccentric screw connecting hole is provided at the outer side of the adjusting hole, an internal thread is provided in the eccentric screw connecting hole, and an eccentric screw 54 is installed in the eccentric screw connecting hole through a thread. In this embodiment, the eccentric screw connecting hole is a countersunk hole, the upper hole of the eccentric screw connecting hole intersects with the adjusting hole, the eccentric screw 54 has the same pitch as the adjusting screw 52, the eccentric screw 54 is rotated, and the eccentric portion 541 of the eccentric screw 54 is rotated. When the distance between the eccentric portion 541 and the adjustment screw 52 is reduced, the eccentric portion 541 and the screw thread of the adjustment screw 52 are engaged with each other, and lock each other, and when the eccentric screw 54 is further rotated, the eccentric portion 541 and the adjustment screw 52 are abutted against each other, and as the eccentric portion 541 is rotated, the eccentric screw 54 and the adjustment screw 52 lock each other more tightly (as shown in fig. 4). When the distance between the eccentric portion 541 and the adjustment screw 52 becomes larger, the eccentric portion 541 and the screw thread of the adjustment screw 52 gradually separate, and the locking effect gradually disappears (as shown in fig. 3). Further, in the present embodiment, the eccentric screw 54 may also use a damping rubber having an eccentric structure, a damping spring, or other structures that can provide a locking effect. The eccentric screw 54 in this embodiment is used to prevent the adjusting screw 52 from being displaced upward in the adjusting hole, that is, prevent the branching piece 2 from moving upward in the vertical direction, and prevent the upper end of the arc-shaped portion 22 of the branching piece 2 from being located on the movement track of the moving blade 4.

Second embodiment: the adjusting and fixing assembly 5 adopts a double-screw locking mode

Preferably, as shown in fig. 7 and 8, the adjustment fixing assembly 5 includes an adjustment hole, an adjustment screw 52, and a first locking screw 53, the adjustment hole is formed through the housing 1 on the upper side of the horizontal portion 21, the adjustment screw 52 is disposed in the adjustment hole, the bottom end of the adjustment screw 52 abuts against the top surface of the horizontal portion 21, and the first locking screw 53 is disposed in the adjustment hole and is located on the upper side of the adjustment screw 52. Further, the length of the adjustment screw 52 is smaller than the depth of the adjustment hole, i.e. in order to bring the bottom of the adjustment screw 52 into abutment with the top surface of the horizontal portion 21, the adjustment screw 52 needs to be fully screwed into the adjustment hole, and then the first locking screw 53 is screwed into the adjustment hole above the adjustment screw 52. In this embodiment, the screw tooth direction of the first locking screw 53 is opposite to the screw tooth direction of the adjusting screw 52, so that it is ensured that the adjusting screw 52 cannot be displaced upwards in the adjusting hole under the action of the elastic force of the branching piece 2, that is, upward movement of the branching piece 2 in the vertical direction is avoided, and the upper end of the arc-shaped portion 22 of the branching piece 2 is prevented from being located on the movement track of the moving knife 4.

Third embodiment: screw locking mode of adjusting and fixing assembly 5 by adopting screw cap

Preferably, as shown in fig. 9 and 10, the adjusting and fixing assembly 5 includes an adjusting hole, an adjusting screw 52, and a second locking screw 55, the adjusting hole is formed through the casing 1 above the horizontal portion 21, the adjusting screw 52 is disposed in the adjusting hole, the bottom end of the adjusting screw 52 abuts against the top surface of the horizontal portion 21, the second locking screw 55 is disposed outside the adjusting hole, and the nut of the second locking screw 55 partially covers the adjusting hole. Further, in this embodiment, a second locking screw connection hole is provided on the outer side of the adjustment hole, an internal thread is provided in the second locking screw connection hole, and the second locking screw is connected in the second locking screw connection hole through a thread. When the adjusting screw 52 is screwed into the adjusting hole and the bottom end of the adjusting screw 52 abuts against the top surface of the horizontal portion 21, the top end of the adjusting screw 52 is not lower than the top surface of the adjusting hole. In the present embodiment, when the bottom end of the adjustment screw 52 abuts against the horizontal portion 21, the top end of the adjustment screw 52 is flush with the top surface of the adjustment hole, at which time the second locking screw 55 is screwed into the second locking screw attachment hole, and the nut of the second locking screw 55 is partially pressed against the top surface of the adjustment screw 52, thereby preventing the adjustment screw 52 from moving upward in the adjustment hole. In this embodiment, the second locking screw 55 is provided, and the nut of the second locking screw 55 partially covers the adjusting hole, so that it is ensured that the adjusting screw 52 does not displace upward in the adjusting hole under the action of the elastic force of the branching sheet 2, that is, upward displacement of the branching sheet 2 in the vertical direction is avoided, and the upper end of the arc-shaped portion 22 of the branching sheet 2 is prevented from being located on the movement track of the movable knife 4.

Further, in the above three embodiments, the adjusting hole is provided with an internal thread, and the adjusting screw 52 is fastened in the adjusting hole by screwing.

In order to achieve the above object or other objects, the present utility model also relates to a sewing machine including the above-mentioned adjusting and fixing device for the thread-separating sheet in the thread-cutting mechanism of the sewing machine.

When the adjusting and fixing device for the branching piece in the thread cutting mechanism of the sewing machine and the sewing machine are used, firstly, the horizontal part 21 of the branching piece 2 is fastened on the bottom surface of the machine shell 1 through the set screw 51, then the adjusting screw 52 is screwed into the adjusting hole from top to bottom to enable the bottom of the adjusting screw 52 to be abutted against the horizontal part 21 of the branching piece 2, an operator adjusts the screwing position of the adjusting screw 52 in the adjusting hole, the front end of the arc-shaped part 22 of the branching piece 2 is positioned below the movable knife 4, the stroke of the branching piece 2 is further limited, and the interference between the branching piece 2 and the movement track of the movable knife 4 is avoided. Then, an operator locks the adjusting screw 52 in the adjusting hole through the three locking modes (an eccentric screw 54 locking mode, a double screw locking mode and a screw locking mode with a nut), so that the adjusting screw 52 is prevented from upwards shifting under the action of the elastic force of the branching sheet 2, and the upward movement of the branching sheet 2 and the interference of the movement track of the movable knife 4 are avoided.

On one hand, the utility model limits the travel of the branching piece 2 by adjusting the fixing component 5, but does not change the elasticity of the branching piece 2, thereby effectively ensuring the bottom line clamping effect of the branching piece 2 and the fixed knife 3, improving the stability and the sewing performance of the sewing machine, and having simple structure and no occupied space; on the other hand, the adoption of the adjusting screw 52 limits the travel of the branching sheet 2, reduces the precision requirement of the branching sheet 2, reduces the probability of defective products caused by deformation of the branching sheet 2 in the heat treatment process, and reduces the difficulty of assembling and adjusting the branching sheet 2.

In conclusion, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. The utility model provides an adjusting and fixing device of parting sheet in sewing machine cut line mechanism, is applicable to in the sewing machine cut line mechanism, sewing machine cut line mechanism includes casing (1), moves sword (4), stationary knife (3) and parting sheet (2) are fixed on casing (1), move sword (4) rotatable coupling on casing (1), and move sword (4) and stationary knife (3) meshing and cut the line; the method is characterized in that: the device comprises an adjusting and fixing assembly (5), wherein the adjusting and fixing assembly (5) is abutted with the branching sheet (2) and used for adjusting the position of the branching sheet (2) in the vertical direction.

2. The device for adjusting and fixing the thread-separating sheet in the thread-cutting mechanism of the sewing machine according to claim 1, wherein: the branching piece (2) comprises a horizontal part (21) and an arc-shaped part (22), the arc-shaped part (22) and the horizontal part (21) are integrated, one end of the arc-shaped part (22) away from the horizontal part (21) is positioned at the lower side of the movement track of the movable knife (4), the adjusting and fixing assembly (5) comprises a set screw (51), an adjusting hole and an adjusting screw (52), and the horizontal part (21) of the branching piece (2) is fixed on the bottom surface of the casing (1) through the set screw (51); the adjusting hole is formed in the machine shell (1), the adjusting screw (52) is arranged in the adjusting hole, and the bottom end of the adjusting screw (52) is abutted to the top surface of the horizontal part (21).

3. The adjusting and fixing device for the thread-splitting sheet in the thread-cutting mechanism of the sewing machine according to claim 2, wherein: the adjusting and fixing assembly (5) further comprises an eccentric screw (54), the eccentric screw (54) is arranged on the outer side of the adjusting screw (52), and an eccentric part (541) of the eccentric screw (54) is abutted with the adjusting screw (52) and used for fixing the adjusting screw (52).

4. The adjusting and fixing device for the thread-separating sheet in the thread-cutting mechanism of the sewing machine according to claim 3, wherein: and an eccentric screw connecting hole is formed in the outer side of the adjusting hole, and the eccentric screw (54) is arranged in the eccentric screw connecting hole.

5. The adjusting and fixing device for the thread-splitting sheet in the thread-cutting mechanism of the sewing machine according to claim 2, wherein: the adjusting and fixing assembly (5) further comprises a first locking screw (53), and the first locking screw (53) is arranged in the adjusting hole and is located on the upper side of the adjusting screw (52).

6. The device for adjusting and fixing the thread-separating sheet in the thread-cutting mechanism of the sewing machine according to claim 5, wherein: the length of the adjusting screw (52) is smaller than the depth of the adjusting hole.

7. The adjusting and fixing device for the thread-splitting sheet in the thread-cutting mechanism of the sewing machine according to claim 2, wherein: the adjusting and fixing assembly (5) further comprises a second locking screw (55), the second locking screw (55) is arranged on the outer side of the adjusting hole, and a nut of the second locking screw (55) partially covers the adjusting hole.

8. The device for adjusting and fixing the thread-separating sheet in the thread-cutting mechanism of the sewing machine according to claim 7, wherein: the outer side of the adjusting hole is provided with a second locking screw connecting hole, an internal thread is arranged in the second locking screw connecting hole, and the second locking screw (55) is installed in the second locking screw connecting hole through threads.

9. The device for adjusting and fixing the thread-separating sheet in the thread-cutting mechanism of the sewing machine according to claim 7, wherein: when the adjusting screw (52) is installed in the adjusting hole and the bottom end of the adjusting screw (52) is abutted against the top surface of the horizontal part (21), the top end of the adjusting screw (52) is not lower than the top surface of the adjusting hole.

10. A sewing machine, characterized in that: the sewing machine comprises the adjusting and fixing device of the branching sheet in the sewing machine thread cutting mechanism of any one of claims 1-9.