CN219653266U - Cutter resetting structure of sewing machine - Google Patents

Abstract

The utility model relates to a cutter resetting structure of a sewing machine, which comprises a movable rod and a supporting seat, wherein the movable rod comprises a connecting end at the rear end, a rotating part in the middle, a mounting end at the front end and a pin shaft; be provided with torsional spring and spacing portion on the lateral wall of supporting seat, the front end butt of torsional spring is on spacing portion, the rear end butt of torsional spring is on first section rotation portion, the rear end of torsional spring pushes down first section rotation portion all the time, make the blade on the terminal installation end of second section rotation portion have the trend that the lifting reset, torsional spring and movable rod structure correspond the adaptation more, occupation space is littleer, can set up in the aircraft nose lower extreme, and not set up the side at the aircraft nose, it is more reasonable to the torsional spring application, higher to the utilization ratio in space, the structure is retried more, can directly match the movable rod setting and need not to set up solitary spanner structure.

Description

Cutter resetting structure of sewing machine

Technical Field

The utility model belongs to the field of sewing machines, and relates to a cutter resetting structure of a sewing machine.

Background

The sewing machine is a kind of clothes making tool, and includes several kinds of sewing machine, including one upper thread and one lower thread, to form one kind of seam on the material to interweave or stitch one or several layers of seam. The flat seam sewing machine can be used for sewing fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastics, paper and the like, the thin materials are generally used for knitting, underwear, shirts, uniforms and the like, the thick materials are generally used for various sportswear, jeans, fashionable wear, overcoat, hats, pi Zai, bags and the like, and the sewn seams are tidy and attractive, uniform, flat and firm, high in sewing speed, simple and convenient to operate and easy to use and understand.

The main structure of the sewing machine comprises a cutter structure for trimming the selvedge, the arrangement scheme can be referred to the technical schemes disclosed in patent documents such as CN202110017345.8, CN202123195794.6, CN202221720868.5, CN201420350281.9 and the like, and the main scheme comprises:

1. including one end suit cutter connecting rod outside the cutter cam, the other end of cutter connecting rod passes through cutter axle spliced pole and cutter hub connection, and the lower extreme of cutter axle is provided with the blind hole with cutter axle coaxial line, and the inserted bar of cutter clutch support inserts and establishes in the blind hole of cutter axle, and the one end of cutter clutch pin inserts and establishes in the cutter clutch support, and the other end is connected with the cutter seat, is provided with the cutter through the cutter rest on the cutter seat.

2. The cutter comprises a shell, a cutter seat and an upper cutter, wherein the cutter seat is movably connected with the shell, and the upper cutter is arranged on the cutter seat.

3. The machine head of the sewing machine is hinged with a lever rocker arm, and a cutter is guided to lift up and down on the machine head of the sewing machine by the principle of a lever, so that the structure is stable; a driving device is arranged on a sewing machine head, and the driving device drives the cutter to lift upwards, so that the cutter is lifted when the cutter is not required to cut cloth.

4. The cutter comprises a blade, a guide bracket seat, a cutter driving shaft sleeve, a cutter clutch frame and a cutter shaft hoop; the connecting rod assembly includes: the wrench comprises a wrench shaft, a wrench shaft crank and a wrench shaft sleeve.

However, the cutter structure in the prior art scheme has partial shortages or can be improved; firstly, the cutter is vertically arranged in an upper and lower mode, and the balance stability and the cloth thickness cutting are insufficient; secondly, the cutter structure occupies more internal space of the shell, and when the cutter structure is applied to the differential lockstitch sewing machine, the cutter structure can collide with the differential feeding structure and is not beneficial to maintenance; secondly, the design precision requirement of the cutter holder is high, when the precision is insufficient, the shaft hole of the cutter holder can collide with the shaft, so that the cutter is unstable, the cutter is offset, the use is influenced, the stability is influenced, and the high precision requirement of the cutter holder is greatly increased; and the scheme of combining motor driving with a motor is complex, the realization cost is too high, and a motor driving mode with simpler and more convenient structure and lower cost is lacked.

To this end, the present utility model will propose a solution to the technical problem described above.

Disclosure of Invention

The utility model aims to provide a cutter resetting structure of a sewing machine, which adopts a torsion spring as a resetting device, is more reasonable in application to the torsion spring, higher in space utilization rate and more simplified in structure, and can be directly matched with a movable rod to be arranged without arranging an independent spanner structure.

The purpose of the utility model is realized in the following way: the cutter resetting structure of the sewing machine comprises a movable rod and a supporting seat, wherein the movable rod comprises a connecting end at the rear end, a rotating part in the middle, a mounting end at the front end and a pin shaft, the movable rod is fixed on the supporting seat through the pin shaft and can rotate around the central shaft of the pin shaft, and the rotating part is divided into a first section of rotating part and a second section of rotating part by taking the pin shaft as a boundary; the side wall of the supporting seat is provided with a torsion spring and a limiting part, the front end of the torsion spring is abutted on the limiting part, the rear end of the torsion spring is abutted on the first section rotating part, the rear end of the torsion spring always presses down the first section rotating part, and the blade on the tail end mounting end of the second section rotating part has a lifting reset trend.

In the cutter resetting structure of the sewing machine, the torsion spring is arranged at the end part of the pin shaft.

In the cutter resetting structure of the sewing machine, the limiting part is a screw tool screwed on the clamping plate.

In the cutter resetting structure of the sewing machine, the limiting part is a bump integrally formed on the clamping plate.

In the cutter resetting structure of the sewing machine, a spanner is arranged on the connecting end or the first section rotating part.

In the cutter resetting structure of the sewing machine, the rotating part is divided into a first section rotating part and a second section rotating part by taking the pin shaft as a boundary, and the second section rotating part is upwards deviated.

In the cutter resetting structure of the sewing machine, the upward offset angle of the second section rotating part is alpha, and 15 degrees is less than alpha and less than 45 degrees.

In the cutter resetting structure of the sewing machine, the connecting end is perpendicular to the rotating part, a locking groove is arranged at the connecting end along the length direction, and a locking hole is formed in the locking groove for locking.

In the cutter resetting structure of the sewing machine, the locking hole is positioned at the lower end of the locking groove.

In the cutter resetting structure of the sewing machine, the connecting end of the rear end of the movable rod, the middle rotating part and the mounting end of the front end are integrally formed.

Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

the cutter reset structure of the sewing machine is provided with the torsion spring, an independent reset spanner structure is omitted, the torsion spring is matched with the movable rod structure more correspondingly, the occupied space is smaller, and the cutter reset structure can be arranged at the lower bottom of the machine head instead of at the side of the machine head.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of a manual sewing machine.

FIG. 2 is a second perspective view of the manual sewing machine embodiment.

Fig. 3 is a schematic view of a housing structure of the manual sewing machine.

Fig. 4 is a schematic perspective view of an electric sewing machine.

Fig. 5 is a schematic perspective view of the protective cover.

Fig. 6 is one of the perspective schematic views of the linkage structure of the cutter of the sewing machine.

FIG. 7 is a second perspective view of the linkage structure of the cutting knife of the sewing machine.

Fig. 8 is a schematic view of a structure of a movable bar of a cutter of the sewing machine.

FIG. 9 is a second schematic view of the structure of the movable bar of the sewing machine cutter.

FIG. 10 is a third schematic view of the structure of the movable bar of the sewing machine cutter.

FIG. 11 is a schematic view of a structure of a movable bar of a cutter of a sewing machine.

FIG. 12 is a fifth schematic view of the structure of the movable bar of the sewing machine cutter.

Fig. 13 is a schematic perspective view of a sewing machine pin.

Fig. 14 is one of the schematic perspective views of the sewing machine support base.

FIG. 15 is a second perspective view of the sewing machine support.

Fig. 16 is one of the prior art structural schematic diagrams.

FIG. 17 is a second schematic diagram of a prior art structure.

FIG. 18 is a third prior art schematic diagram.

The meaning indicated by the reference numerals in the figures: 1-a housing; 10 notch; 11-a handpiece; 12-a stand; 13-a cross beam; 14, positioning a clamping block; 141-a holding portion; 142-a fixing part; 1421-a bar slot; 15-swinging shaft holes; 16-a presser foot bar hole; 17-machine pinholes; 19-an electric motor;

2-protecting cover; 20-a drive shaft hole; 21-a widening section;

3-a driving rod; 31-crank;

4-connecting rods;

5-locking member;

6-a movable rod; 61-connecting ends; 610-a locking hole; 611-a locking groove; 612-a wrench;

62-a rotating part; 620-first connection holes; 621-a first-stage rotation section; 622-second-stage rotation part;

623-a first fastening hole;

63-mounting end; 631-a mounting base; 6310-mounting groove; 64-pin shafts; 641-second fastening holes;

65-fasteners;

7-a supporting seat; 70-clamping grooves; 71-clamping plates; 711-a second connection hole; 712-third connecting hole;

72-connecting plates; 721-connection holes; 73-a limiting part;

8-a blade;

9-torsion spring.

Detailed Description

The utility model is further described in connection with the specific embodiments of fig. 1-18 below:

a sewing machine comprises a shell 1, an internal driving structure, a needle and a presser foot, wherein the shell 1 comprises a machine head 11, a machine base 12 and a cross beam; the back side of the shell 1 is provided with a notch 10 and is provided with a cutter linkage structure and a protective cover 2, part of the cutter linkage structure is accommodated in the protective cover 2, and the internal driving structure is connected with the cutter linkage structure through the notch 10; the cutter linkage structure comprises a driving rod 3, a connecting rod 4, a movable rod 6 and a supporting seat 7, wherein the movable rod 6 is provided with a blade 8, the driving rod 3 is arranged in a protective cover 2 and is connected with an internal driving structure of a shell 1, the supporting seat 7 is arranged at the lower bottom of the machine head 11 and supports the movable rod 6, the driving rod 3 drives the movable rod 6 to rotate by taking the supporting seat 7 as an axis through the connecting rod 4 to drive the blade 8 to rotationally cut; the last blade cloth cutting track that realizes of linkage structure is with supporting seat 7 as the fulcrum round rotation, see the technical scheme that the description figure 16, description figure 17 and description figure 18 are disclosed, and the cloth cutting track of blade 8 is vertical up-and-down motion, when carrying out the cutting work of thicker cloth, produces skew or the card and is just rigid inadequately easily, and the rotatory cloth cutting track in this technical scheme can reference the shearing principle of scissors, from progressively rotating with a direction and cutting into, even when handling thick cloth, also can stablely cut into, does not produce skew or card and is put into.

Further, the outside of breach 10 is equipped with safety cover 2, and the left and right sides of safety cover 2 is provided with drive shaft hole 20, and the direction in drive shaft hole 20 is parallel with the length direction of casing 1, and in this technical scheme, actuating lever 3 installs in safety cover 2 through drive shaft hole 20, and safety cover 2 protects actuating lever 3 and inside drive structure and cutter linkage structure's junction part to prevent that the foreign matter from falling into inside the casing to play grease proofing dirt-proof effect, installation actuating lever 3 is succinct convenient; the protection cover 2 can be integrally connected to the back side of the cross beam, and can be installed and fixed through connecting pieces such as screws, and it is worth noting that the protection cover 2 can be boss-shaped, step-shaped or cylindrical and is used for placing and protecting structures such as the driving rod 3.

The technical scheme is that a differential feeding structure is required to be arranged in the inner space of a shell aiming at the shell of a differential lockstitch sewing machine, wherein a swing shaft hole 15, a presser foot bar hole 16 and a needle hole 17 are arranged below a machine head 11 of the shell 1.

Further, the integrated into one piece has the portion of widening 21 below the safety cover 2, be provided with the location fixture block 14 on the portion of widening 21, the location fixture block 14 is used for supporting the side of the connecting rod of cutter, the side of connecting rod 4 is planar, in this technical scheme, the back side of casing 1 is provided with the location fixture block 14 and is used for assisting the moving track of connecting rod 4 to remain stable, see description figure 2, the length ratio of connecting rod 4 is longer, need extend below aircraft nose 11, make movable rod 6 have sufficient space to swing, in order to prevent to produce the skew in the motion process of connecting rod 4, set up the location fixture block 14 and support it and keep stable, specifically, the back side of casing 1 designates the fixture block 14 and sets up on the portion of widening 21 of safety cover 2, the portion that belongs to extends is the safety cover 2 downwardly extending, make the location fixture block 14 can be installed at the position of connecting rod 4 slightly in the middle section, consequently set up the portion 21 and compare in the structure of changing casing 1, the side of connecting rod 4 and the face that location fixture block 14 and connecting rod 4 butt all be planar, make the positioning effect more stable.

The positioning fixture 14 comprises a plate-shaped supporting part 141 and a fixing part 142, the supporting part 141 supports the side edge of the connecting rod 4, the fixing part 142 is fixed on the back side of the shell 1, the supporting part 141 and the fixing part are connected at right angles, in the technical scheme, referring to the specification of fig. 5, the positioning fixture 14 is a right-angled plate, the fixing part 142 is used for fixing, the supporting part 141 is used for supporting the side edge of the connecting rod 4, and the supporting part 141 and the fixing part are integrally formed.

The positioning fixture block 14 is provided with a transversely arranged bar-shaped groove 1421, the bar-shaped groove 1421 is matched with a screw to fix the positioning fixture block 14, the positioning fixture block 14 can be adjusted by the bar-shaped groove 1421, the distance between the positioning fixture block 14 and the connecting rod 4 is 2 or 3 bars, the bar-shaped groove 1421 is parallel up and down, in the technical scheme, the fixing part 142 of the positioning fixture block 14 is provided with the bar-shaped groove 1421, the bar-shaped groove 1421 is used for transversely adjusting the abutting part 141 of the positioning fixture block 14 to approach the connecting rod 4 to abut against the side edge of the connecting rod 4, and the positioning fixture block 14 has an adjusting function.

Further, the movable rod 6 includes a rear connecting end 61, a middle rotating portion 62, a front mounting end 63, and a pin shaft 64, the connecting end 61 is used for connecting and locking, the blade 8 is mounted on the mounting end 63, the rotating portion 62 is provided with a first connecting hole 620, the rotating portion 62 is fixed on the pin shaft 64 through the first connecting hole 620 and can rotate around the central axis of the pin shaft 64 to drive the blade 8 to perform rotary cutting, in this technical scheme, the structure of the movable rod 6 can refer to fig. 8 to fig. 12, the movable rod 6 is in a long bar shape, fixed at the bottom of the machine head 11 and drives the blade 8 to cut cloth in a rotary manner, the main purpose of the movable rod 6 is to replace the prior art tool apron, the tool apron structure can refer to the tool apron technical scheme in fig. 17 and 18, the motion trail of the cutter realizes up-and-down displacement through the shaft hole on the cutter holder, and the cutter can smoothly execute cloth cutting work only by requiring very high precision between the shaft hole and the shaft, so that the cutter is a great test in cost, in actual use, especially when relatively thick cloth is handled, the situation of clamping or blade deflection can occur, and the stability is greatly influenced, specifically, the stability is influenced by the fact that the fit clearance between the shaft hole and the shaft is small, the clamping and the shaft hole occurs in the motion process, the stability is influenced, the fit clearance between the shaft hole and the shaft is large, looseness can occur, the shaft and the shaft hole deviate, and finally the looseness and the deviation of the blade are caused, so that the size requirement between structures is extremely high; the movable rod 6 in the technical scheme adopts a rotating mode, so that the sliding friction force which needs to be overcome by up-and-down displacement is avoided, the rotating friction force which is relatively easy to overcome is converted, the stability of the movement of the movable rod 6 is enhanced, the requirement on the precision in actual production is not high, and the production cost is greatly saved.

The rotating part 62 is divided into a first section rotating part 621 and a second section rotating part 622 by taking the pin shaft 64 as a boundary, the second section rotating part 622 is upwards deflected, the upwards deflected angle of the second section rotating part 622 is alpha, 15 degrees is less than alpha and less than 45 degrees, in the technical scheme, referring to the attached drawing 11 of the specification, the front and back of the long rod-shaped movable rod 6 are not straight, one end of the mounting blade 8 keeps upturned, when the connecting end 61 is subjected to trend rotation, the upwards deflected second section rotating part 622 is easier to retract than the upwards deflected, the limited space under the machine head 11 can be fully utilized, the potential safety hazard can be well prevented, and the hand of a worker is prevented from being cut.

The utility model discloses a movable rod 6 is provided with the blade mount pad 631 on the installation end 63, blade 8 passes through the blade mount pad 631 to be set up on the installation end 63, be provided with the mounting groove 6310 that corresponds with the installation end 63 on the blade mount pad 631, the blade mount pad 631 inlays on the installation end 63 through mounting groove 6310, and be provided with the screw tool and fix the two, in this technical scheme, blade 8 installs through the blade mount pad 631, not direct mount on movable rod 6, reduce the die sinking cost of movable rod 6, still can play the regulating action to blade 8 through the setting and the change of blade mount pad 631, the stability of blade 8 is further consolidated to the mounting groove 6310 structure, and easy location during the installation.

The rotation part 62 and the pin shaft 64 are rigidly connected, the rotation part 62 and the pin shaft 64 are jointly rotated, specifically, the bottom of the rotation part 62 is provided with a first fastening hole 623, the first fastening hole 623 is perpendicular to and is communicated with the first fastening hole 620, the periphery of the pin shaft 64 is provided with a second fastening hole 641, corresponding fasteners 65 are arranged between the first fastening hole 623 and the second fastening hole 641, in the technical scheme, the rotation part 62 and the pin shaft 64 are rigidly connected or rotationally connected, the rotation part 62 and the pin shaft 64 are jointly rotated, referring to fig. 15, it is worth noting that the rotation part 62 can rotate around the central axis of the pin shaft 64 instead of rotating around the pin shaft 64, namely, the rotation part 62 rotates around the pin shaft 64 and jointly rotates with the pin shaft 64, the rigid connection comprises two schemes of fastening the fasteners 65 and integrally forming the rotation part 62 and the pin shaft 64, and the rigid connection is adopted, the advantages of the rigid connection are that the integrity is stronger when the movable rod 6 rotates, the integrity is not only fixed by the fastening of the fastener in the horizontal direction of the clamp groove 70, but also can be firmly fixed by the fastening means in the longitudinal direction of the fastener 65, the vibration of the movable rod 6, the vibration can be greatly reduced, and the vibration can be firmly connected with the rotation track of the blade 62 by the common blade, and the rotation part can be stably rotated, and the rotation track is greatly reduced by referring to the rotation of the rotation structure, and the rotation of the blade can be stably shown in the figure, and the rotation structure, and the rotation can be stably has the rotation, and the rotation track can be stably and firmly, and the rotation, and the vibration can be stably and the stable by the stable, and the stable.

The connecting end 61 is perpendicular to the rotating portion 62, the connecting end 61 is provided with a locking groove 611 along the length direction, the locking groove 611 is provided with a locking hole 610 for locking, the locking hole 610 is located at the lower end of the locking groove 611, and the connecting end 61 is provided with a wrench 612, in the technical scheme, the locking groove 611 is used for facilitating positioning and locking of the locking piece 5, the wrench 612 is used for acting force during manual operation, the structural shape of the wrench 612 is not limited to the example in fig. 12 of the specification, and the wrench 612 is convenient for fingers to hold.

Further, the supporting seat 7 includes clamping plates 71 at two sides of the clamping groove 70, the clamping plates 71 at two sides are provided with a second connecting hole 711 and a third connecting hole 712, and the pin shaft 64 is installed through the second connecting hole 711 and the third connecting hole 712.

The top of supporting seat 7 is provided with the connection flat board 72, and the connection flat board 72 butt is provided with connecting hole 721 in the lower bottom of aircraft nose 11 on the connection flat board 72, and supporting seat 7 passes through connecting hole 721 to be connected fixedly, the connection flat board 72 is integrated into one piece with splint 71, and the width of connection flat board 72 is the same with the width between the lateral wall of two splint 71.

Further, a torsion spring 9 and a limiting part 73 are arranged on the side wall of the supporting seat 7, the front end of the torsion spring 9 is abutted on the limiting part 73, the rear end of the torsion spring 9 is abutted on the first section rotating part 621, the rear end of the torsion spring 9 always presses down the first section rotating part 621, so that the blade 8 on the mounting end 63 at the tail end of the second section rotating part 622 has a lifting and resetting trend, and in the technical scheme, a resetting structure is used for automatically resetting and lifting the blade, so that the safety of the blade and a user is ensured; the technical scheme disclosed in patent CN202123195794.6 can be referred to, and in particular reference is made to fig. 17, in the technical scheme, the torsional spring 9 is a cutter reset torsional spring acting on a cutter reset wrench, so that the cutter reset wrench is separated from a cutter connecting piece, after the cutter reset wrench loses the action of external force, the cutter reset wrench can be separated from the cutter connecting piece under the drive of the cutter reset torsional spring, in the technical scheme, the torsional spring 9 is directly arranged on the movable rod 6, the middle part of the specific torsional spring 9 is arranged at the end part of the pin shaft 64, the movable rod 6 is a tool apron in the prior art, the independent reset wrench structure is omitted, the torsional spring 9 and the movable rod 6 are correspondingly adapted, the occupied space is smaller, the cutter reset wrench can be arranged at the lower bottom of the machine head 11, but not at the side of the machine head 11, and compared with the technical scheme in the prior art, the technical scheme, the cutter reset wrench is more reasonable in application of the torsional spring, the utilization rate is higher, the structure is more simplified, and the movable rod 6 can be directly matched without setting an independent wrench structure.

The limiting part 73 is a screw tool screwed on the clamping plate 71 or a bump integrally formed on the clamping plate 71, in the technical scheme, the limiting part 73 is used for clamping the other end of the torsion spring 9, the limiting part is used as a fulcrum, the cost of the screw tool is low, the bump mounting step is simple, the bump is integrally formed, the selection is made according to the actual situation, and the shape of the bump is not limited.

Further, referring to fig. 4 of the specification, in a second embodiment, a cutter resetting structure of a sewing machine includes a housing 1, a needle and a presser foot, wherein the housing 1 includes a machine head 11, a machine base 12 and a cross beam; the back side of crossbeam 13 is provided with motor 19, link to each other through crank 31 and connecting rod 4 between motor 19 and the movable rod 6, the lower extreme of connecting rod 4 is less than the bottom of aircraft nose 11, the lower extreme of aircraft nose 11 is provided with supporting seat 7, movable rod 6 of cutter is installed on supporting seat 7 and can rotate along supporting seat 7 by motor 19 drive, in this technical scheme, cutter structure's drive adopts motor drive, motor 19 sets up the back side at crossbeam 13, direct drive connecting rod 4 control movable rod 6 rotates, the structure is more retrencied, the motor is by programmable logic controller through digital or analog input/output control, thereby gather cutter structure and inner structure's swing information, feedback is for the computer combines feedback information such as main shaft, lift presser foot and needle, through this kind of individual control, the mode of individual drive, cutter structure combines and simplifies, can distinguish alone during repair or maintenance, the mode of maintenance about PLC computer control motor itself is the motor, the mechanism is the control of matured, can also be used in order to restore to the sewing machine has more stable structure, the structure has been compared with the sewing machine has been reset, the structure has been more simplified, the sewing machine has been used in the field has been saved, the structure has been reset, and compared with the sewing structure has been more stable.

The above embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model in this way, therefore: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (10)

1. A cutter reset structure of a sewing machine is characterized in that: the movable rod (6) comprises a connecting end (61) at the rear end, a middle rotating part (62), a mounting end (63) at the front end and a pin shaft (64), the movable rod (6) is fixed on the supporting seat (7) through the pin shaft (64) and can rotate around the central shaft of the pin shaft (64), and the rotating part (62) is divided into a first section rotating part (621) and a second section rotating part (622) by taking the pin shaft (64) as a boundary; be provided with torsional spring (9) and spacing portion (73) on the lateral wall of supporting seat (7), the front end butt of torsional spring (9) is on spacing portion (73), and the rear end butt of torsional spring (9) is on first section rotation portion (621), and the rear end of torsional spring (9) pushes down first section rotation portion (621) all the time, makes blade (8) on second section rotation portion (622) terminal installation end (63) have the trend that the lifting reset.

2. The cutter resetting structure of a sewing machine as defined in claim 1, wherein: the torsion spring (9) is arranged at the end part of the pin shaft (64).

3. The cutter resetting structure of a sewing machine as recited in claim 2, wherein: the limiting part (73) is a screw tool which is screwed on the clamping plate (71).

4. The cutter resetting structure of a sewing machine as recited in claim 2, wherein: the limiting part (73) is a lug integrally formed on the clamping plate (71).

5. The cutter resetting structure of a sewing machine as defined in claim 1, wherein: a wrench (612) is arranged on the connecting end (61) or the first section rotating part (621).

6. The cutter resetting structure of a sewing machine of any one of claims 1-5, wherein: the rotating part (62) is divided into a first section rotating part (621) and a second section rotating part (622) by taking a pin shaft (64) as a boundary, and the second section rotating part (622) is upwards offset.

7. The cutter resetting structure of a sewing machine as defined in claim 6, wherein: the second-stage rotating part (622) is upwardly offset by an angle alpha, 15 degrees < alpha < 45 degrees.

8. The cutter resetting structure of a sewing machine of any one of claims 1-5, wherein: the connecting end (61) is perpendicular to the rotating part (62), the connecting end (61) is provided with a locking groove (611) along the length direction, and a locking hole (610) is arranged in the locking groove (611) for locking.

9. The cutter resetting structure of a sewing machine as defined in claim 8, wherein: the locking hole (610) is located at the lower end of the locking groove (611).

10. The cutter resetting structure of a sewing machine of any one of claims 1-5, wherein: the connecting end (61) at the rear end of the movable rod (6), the middle rotating part (62) and the mounting end (63) at the front end are integrally formed.