CN218861078U - Cutter assembly and sewing machine - Google Patents

Abstract

The utility model belongs to the technical field of the sewing machine technique and specifically relates to a cut-off knife subassembly for cutting cloth is related to, solves the inconvenient problem of prior art cut-off knife subassembly installation, a cut-off knife subassembly, including the blade holder, first cut-off knife of detachable connection and second cut-off knife on the blade holder, the second cut-off knife sets up the blade holder with between the first cut-off knife, the second cut-off knife with the laminating of first cut-off knife.

Description

Cutter assembly and sewing machine

Technical Field

The disclosure relates to the technical field of sewing machines, in particular to a cutter assembly for cutting cloth and a sewing machine.

Background

A sewing machine is a machine that uses one or more sewing threads to form one or more tracks in a seam material to interweave or stitch together one or more layers of the seam material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. At present, a plurality of places are provided with sewing art bars in China, a sewing machine is allowed to be watched by people from one corner of the society, a plurality of people buy the sewing machine, old clothes and small bags which are passed through before are sewn with own small originality, and a plurality of young housewives are personally and manually sewn for the babies to release the mother love, the personality and the familiarity.

The sewing machine generally has a cutter component for cutting cloth, the traditional cutter component comprises an upper cutter and a lower cutter, the upper cutter is fixed on an upper cutter seat, the lower cutter is arranged on a lower cutter seat, the lower cutter seat is arranged on a sewing machine workbench, the upper cutter needs to do up-and-down cutting action and horizontal action along with movement of the cloth when the cloth is cut, so that the requirements on stability, longitudinal and transverse adjustability of the cutter seat are higher, the sewing machine is ensured to keep high consistency of a gap between the upper cutter and the lower cutter all the time under the conditions of shaking and the like, the cloth can be cut more parallel and level, the appearance is attractive, in addition, when the upper cutter and the lower cutter are installed, the longer time is needed to adjust the gap and the coaxiality of the upper cutter and the lower cutter, the time of 1-2 days is generally needed, and the time cost is higher and inconvenient.

SUMMERY OF THE UTILITY MODEL

To the inconvenient problem of cut-off knife subassembly installation among the prior art, this disclosure provides a simple structure, the cut-off knife subassembly of installation of being convenient for.

The technical scheme adopted by the disclosure for solving the technical problems is as follows: the utility model provides a cut-off knife subassembly, includes the blade holder, detachable connection has first cut-off knife and second cut-off knife on the blade holder, the second cut-off knife sets up the blade holder with between the first cut-off knife, the second cut-off knife with the laminating of first cut-off knife.

Furthermore, a rotating rod is arranged on the cutter holder, and the first cutter is connected with the cutter holder through the rotating rod.

Further, be provided with the shell fragment on the blade holder, shell fragment and first cut-off knife contact for with the laminating of second cut-off knife and first cut-off knife, avoid having the gap between first cut-off knife and second cut-off knife, the effect is tailor in the influence.

In some embodiments, the rotating rod is connected with a first connecting piece, and the first cut-off knife is connected with the rotating rod through the first connecting piece.

In some embodiments, the rotating rod is provided with a first clamping piece, the first cut-off knife is provided with a second clamping piece matched with the first clamping piece, and the rotating rod is clamped with the first cut-off knife.

In some embodiments, a first connector is arranged on the rotating rod, a second connector matched with the first connector is arranged on the first cut-off knife, and the rotating rod is spliced with the first cut-off knife.

In some embodiments, a second connecting member is connected to the holder, and the second cutting blade is connected to the holder through the second connecting member.

In some embodiments, the tool post is provided with a third clamping member, the second cutting knife is provided with a fourth clamping member matched with the third clamping member, and the tool post is clamped with the second cutting knife.

In some embodiments, a third connector is arranged on the tool holder, a fourth connector matched with the third connector is arranged on the second cutter, and the tool holder is connected with the second cutter in an inserting mode.

Further, first cut-off knife includes cutting edge portion, connecting rod and adjusts the pole, cutting edge portion, connecting rod and regulation pole integrated into one piece, the connecting rod sets up between cutting edge portion and regulation pole, cutting edge portion sets up in first cut-off knife lower part, the width of connecting rod and cutting edge portion junction is less than the width of adjusting pole and connecting rod junction.

Furthermore, the width of cutting edge portion is less than or equal to the width of adjusting the pole, adjust one side of pole with one side of connecting rod is the parallel and level mutually.

Further, the cutting edge portion includes first cutting edge, first cutting edge the lower terminal surface of adjusting the pole with the side of connecting rod forms the indent structure, first cutting edge with it is relative to adjust the pole lower extreme, first cutting edge with the cooperation of second cut-off knife is used for cuting the cloth.

Further, cutting edge portion still includes the second cutting edge, the second cutting edge is in the below of first cutting edge, the second cutting edge is used for cutting the cloth, the second cutting edge is parallel with the regulation pole on length direction, first cutting edge with the contained angle of second cutting edge is greater than 90 degrees.

Further, cutting edge portion still includes third cutting edge and fourth cutting edge, the third cutting edge sets up the below of second cutting edge, the contained angle of third cutting edge and fourth cutting edge is less than 90 degrees, the one end of fourth cutting edge with the third cutting edge is connected and is formed the closed angle, the one end of fourth cutting edge with the third cutting edge is connected, the other end of fourth cutting edge is located the junction of connecting rod and cutting edge portion.

Furthermore, the second cut-off knife sets up and is being close to indent structure position department, the lower extreme of second cut-off knife is less than the upper end of indent structure, and such setting is convenient for the second cut-off knife to cut the cloth.

Another object of the present disclosure is to provide a sewing machine, which comprises a machine head, wherein a cutter assembly is arranged on the machine head, and the cutter assembly is the above cutter assembly.

Further, the handpiece includes a housing and a drive mechanism disposed outside the housing.

Further, be provided with link mechanism in the casing, actuating mechanism includes a drive mechanism, link mechanism's one end and a drive mechanism are connected, the last slider that is connected with of link mechanism, the slider cup joints on the dwang, a drive mechanism is used for driving link mechanism and rotates, link mechanism's rotation drives slider up-and-down motion, the slider drives the dwang up-and-down motion.

Further, actuating mechanism still includes second actuating mechanism, second actuating mechanism with the dwang is connected, second actuating mechanism is used for driving first cut-off knife rotates certain angle in circumference.

Further, first cut-off knife with the sub-unit connection of dwang, two stop collars have been cup jointed on the dwang, the slider is located between two stop collars, two stop collars and slider contact, the stop collar is used for carrying out the axial to the slider spacing, slider and stop collar are mutually supported and are used for driving dwang up-and-down motion.

Further, the aircraft nose still includes cloth pressing mechanism, cloth pressing mechanism includes the movable rod of up-and-down motion, the movable rod is connected with third actuating mechanism, third actuating mechanism is used for driving the movable rod up-and-down motion, the movable rod sets up on the casing.

Further, the sub-unit connection of movable rod has the fixed block, the fixed block is connected with the pressing piece, the pressing piece is including pressing the cover and pressing the clamp plate, it sheathes in to press the clamp plate to cup joint, the top of pressing the clamp plate is provided with elasticity circle and jump ring, the elasticity circle sets up at the jump ring and presses between the clamp plate.

Further, press the cover to be spherical structure, the upper end and the lower extreme of pressing the cover all are provided with the opening that supplies the cut-off knife subassembly to pass, the face at the upper end opening and the lower extreme opening place of pressing the cover is the plane, the upper portion of pressing the cover is provided with first annular indent, press the clamp plate to cup joint on first annular indent, the upper end opening part is provided with annular arch, the bellied below of annular is provided with second annular indent, the jump ring sets up in the second annular indent, second annular indent is located first annular indent top.

Compared with the existing products, the beneficial effects of the present disclosure are: first cut-off knife and second cut-off knife all with blade holder detachable connection, be convenient for regularly change first cut-off knife and second cut-off knife, the laminating of second cut-off knife and first cut-off knife, such setting up makes the stability of cut-off knife subassembly better, makes the second cut-off knife obtain better fixed, and the relative position of second cut-off knife and first cut-off knife is adjusted more easily simultaneously.

Drawings

The present application will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.

FIG. 1 is one of the schematic structural views of a cutting blade assembly of the present disclosure;

FIG. 2 is an enlarged view of a portion of the disclosure at A in FIG. 1;

FIG. 3 is an exploded view of one of the cutter assemblies of the present disclosure;

FIG. 4 is one of the schematic structural views of a first cutting knife of the present disclosure;

FIG. 5 is a second schematic structural view of the first cutting knife of the present disclosure;

FIG. 6 is a third schematic structural view of the first cutting knife of the present disclosure;

FIG. 7 is a second schematic view of a cutting assembly according to the present disclosure;

FIG. 8 is a third schematic view of a cutting assembly according to the present disclosure;

FIG. 9 is a second exploded view of a cutting knife assembly of the present disclosure;

FIG. 10 is a third exploded view of a cutter assembly of the present disclosure;

FIG. 11 is a fourth schematic view of a cutting assembly according to the present disclosure;

FIG. 12 is an enlarged view of a portion of the disclosure at B in FIG. 11;

FIG. 13 is a schematic structural view of a press sleeve of the present disclosure;

FIG. 14 is a cross-sectional view of a cutter assembly of the present disclosure;

FIG. 15 is an enlarged fragmentary view at C of FIG. 14 of the present disclosure;

FIG. 16 is a fifth schematic view of a cutting assembly according to the present disclosure;

fig. 17 is a partial enlarged view at D in fig. 16 of the present disclosure.

Description of reference numerals:

1. a first cutter; 2. a tool apron; 3. a second cutter; 4. a first connecting member; 6. adjusting a rod; 7. a connecting rod; 8. a blade part 11, a first blade; 12. a second blade; 13. a third blade; 14. a fourth blade; 15. a link mechanism; 16. a first drive mechanism; 17. a housing; 18. a work table; 19. a second drive mechanism; 20. rotating the rod; 21. a position limiting sleeve; 22. a slider; 23. a movable rod; 24. a fixed block; 25. a pressing plate; 26. an annular projection; 27. a clamp spring; 28. an elastic ring; 29. pressing the sleeve; 30. a cylinder; 31. a first annular indent; 32. a second annular recess; 33. an elastic sheet.

Detailed Description

In order to make the technical solutions of the present disclosure better understood by those skilled in the art, the present disclosure will be described in detail, clearly and completely with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.

In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

It will be understood by those skilled in the art that in the disclosure of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships that are based on those shown in the drawings, which are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the terms described above should not be considered limiting to the present invention.

An embodiment of the present disclosure discloses a cutting knife assembly, as shown in fig. 1-17.

The utility model provides a cut-off knife subassembly, includes blade holder 2, and detachable connection has first cut-off knife 1 and second cut-off knife 3 on the blade holder 2, and second cut-off knife 3 sets up between blade holder 2 and first cut-off knife 1, and second cut-off knife 3 and the laminating of first cut-off knife 1. Be provided with the dwang on the blade holder, first cut-off knife 1 passes through dwang 20 and blade holder 2 is connected, first cut-off knife 1 includes cutting edge portion 8, connecting rod 7 and regulation pole 6, it connects to adjust pole 6 and blade holder 2, cutting edge portion 8, connecting rod 7 and regulation pole 6 integrated into one piece, connecting rod 7 sets up between cutting edge portion 8 and regulation pole 6, cutting edge portion 8 sets up the lower part at first cut-off knife 1, the width of connecting rod 7 and cutting edge portion 8 junction is less than the width of adjusting pole 6 and connecting rod 7 junction, make the lower extreme of adjusting pole 6 and connecting rod 7 form "7 style of calligraphy", cutting edge portion 8's width less than or equal to adjusts the width of pole 6, the one side of adjusting pole 6 is leveled mutually with one side of connecting rod 7, make cutting edge portion 8 keep in the width range of adjusting pole 6, better cutting.

It is worth explaining that the elastic sheet 33 is arranged on the tool apron 2, the elastic sheet 33 is in contact with the first cut-off knife 1, and is used for attaching the second cut-off knife 3 to the first cut-off knife 1, so that the phenomenon that a gap appears between the first cut-off knife 1 and the second cut-off knife 3 after the cut-off knife assembly is used for a long time and the cutting effect is influenced is avoided.

The knife edge part 8 comprises a first knife edge 11 used for cutting cloth, the first knife edge 11, the adjusting rod 6 and the connecting rod 7 form a concave structure, the lower end of the first knife edge 11 is opposite to the lower end of the adjusting rod 6, and the first knife edge 11 and the second cut-off knife 3 are matched for cutting the cloth. The second cut-off knife 3 sets up in the position department that is close to the indent structure, and the side of second cut-off knife 3 is laminated with adjusting pole 6 mutually, and the lower extreme of second cut-off knife 3 is less than the upper end of indent structure, and such setting is convenient for second cut-off knife 3 cuts the cloth.

It is worth noting that the knife edge portion 8 further comprises a second knife edge 12, the second knife edge 12 is arranged below the first knife edge 11, the second knife edge 12 is used for cutting cloth, the second knife edge 12 is parallel to the adjusting rod 6 in the length direction, and the included angle between the first knife edge 11 and the second knife edge 12 is larger than 90 degrees.

The knife edge part further comprises a third knife edge 13 and a fourth knife edge 14, the third knife edge 13 is arranged below the second knife edge 12, the included angle between the third knife edge 13 and the fourth knife edge 14 is smaller than 90 degrees, one end of the fourth knife edge 14 is connected with the third knife edge 13 to form a sharp corner, the third knife edge 13 and the fourth knife edge 14 are used for puncturing cloth, and the sharp corner is used for operating the cloth more easily. One end of the fourth blade 14 is connected with the third blade 13, and the other end of the fourth blade 14 is located at the joint of the connecting rod 7 and the blade part 8.

In some embodiments, the rotating rod 20 is connected with a first connecting member 4, the first cut-off knife 1 is connected with the rotating rod 20 through the first connecting member 4, specifically, the first connecting member 4 may be a connecting sheet or a connecting block, the rotating rod 20 is provided with a first mounting hole, the first connecting member 4 is provided with a second mounting hole matched with the first mounting hole, the adjusting rod 6 is provided with a first mounting groove, the first mounting groove is arranged between the first mounting hole and the second mounting hole, the first mounting groove, the second mounting hole, the third mounting hole and the fourth mounting hole are connected through bolts, and the connection is reliable and the installation is convenient.

In some embodiments, the rotating rod 20 is provided with a first clamping member, the first cut-off knife 1 is provided with a second clamping member matched with the first clamping member, and the rotating rod 20 and the first cut-off knife 1 are clamped, so that the operation is simple and convenient.

In some embodiments, the rotating rod 20 is provided with a first connector, the first cut-off knife 1 is provided with a second connector which is matched with the first connector, and the rotating rod 20 is connected with the first cut-off knife 1 in an inserting manner, so that the connection is reliable and the structure is simple.

It should be understood that the above only lists several connection manners of the rotating rod and the first cutting knife 1, and the rotating rod 20 and the first cutting knife 1 may also be other detachable connection manners, which are not limited in particular.

In some embodiments, the tool post 2 is connected with a second connecting member, the second cut-off knife 3 is connected with the tool post 2 through the second connecting member, specifically, the second connecting member may be a connecting piece or a connecting block, the tool post 2 is provided with a third mounting hole, the second connecting member is provided with a fourth mounting hole matched with the third mounting hole, the upper portion of the second cut-off knife 3 is provided with a second mounting groove, the second mounting groove is arranged between the third mounting hole and the fourth mounting hole, the third mounting hole and the fourth mounting hole are connected through a bolt, and the connection is reliable and the installation is convenient.

In some embodiments, a third clamping member is disposed on the tool holder 2, a fourth clamping member is disposed on the second cutting knife 3, and the fourth clamping member and the third clamping member cooperate with each other, so that the tool holder 2 and the second cutting knife 3 are clamped together.

In some embodiments, the tool holder 2 is provided with a third connector, the second cut-off knife 3 is provided with a fourth connector matched with the third connector, and the tool holder 2 is connected with the second cut-off knife 3 in an inserting manner, so that the structure is simple and the second cut-off knife 3 is convenient to replace.

It should be understood that the above only illustrates several connection manners of the tool holder 2 and the second cutting knife 3, and the tool holder 2 and the second cutting knife 3 can also be other detachable connection manners, which are not limited in this respect.

It should be noted that the cutting edge of the knife edge part is a single-sided knife, the single-sided knife has only one angle, the angle is very small and sharp, and the cloth can be parallel and level in the process of cutting the cloth, so that burrs cannot occur.

A sewing machine comprises a machine head, wherein the machine head is arranged on a workbench 18 of the sewing machine, a cutter assembly is arranged on the machine head, and the cutter assembly is the cutter assembly in the embodiment. The aircraft nose includes casing 17 and actuating mechanism, actuating mechanism sets up the outside at casing 17, be provided with link mechanism 15 in the casing 17, actuating mechanism includes a actuating mechanism 16, link mechanism 15's one end and a actuating mechanism 16 are connected, link mechanism 15 includes the connecting rod, be connected with slider 22 on the connecting rod, slider 22 cup joints on dwang 20, a actuating mechanism 16 is used for driving link mechanism 15 and rotates, link mechanism 15's rotation drives slider 22 up-and-down motion, slider 22 drives dwang 20 up-and-down motion, and then drive blade holder 2 up-and-down motion. The driving mechanism further comprises a second driving mechanism 19, the second driving mechanism 19 is connected with the rotating rod 20, and the second driving mechanism 19 is used for driving the first cut-off knife 1 to rotate for a certain angle in the circumferential direction, so that the first cut-off knife 1 can cut the cloth conveniently. Preferably, the drive mechanism is a motor.

The sub-unit connection of first cut-off knife 1 and dwang 20 has cup jointed two stop collars 21 on the dwang 20, and stop collar 21 and dwang 20 are the state of hugging closely, and slider 22 is located between two stop collars 21, and two stop collars 21 and slider 22 contact, stop collar 21 are used for carrying out the axial to slider 22 spacing, and slider 22 and stop collar 21 mutually support and are used for driving the dwang 20 up-and-down motion. Under the driving of the second driving mechanism 19, the rotating rod 20 moves circumferentially, the two limiting sleeves 21 move circumferentially along with the rotating rod 20, and the sliding block 22 does not move; under the driving of the first driving mechanism 16, the link mechanism 15 drives the slider 22 to move up and down, and the limiting sleeve 21 limits the axial direction of the slider 22, so that the rotating rod 20 moves up and down along with the slider 22, and drives the tool apron 2 to move up and down, thereby driving the first cut-off knife 1 and the second cut-off knife 3 to move up and down.

The aircraft nose still includes compress mechanism, compress mechanism includes the movable rod 23 of up-and-down motion, movable rod 23 is connected with cylinder 30, cylinder 30 is used for driving movable rod 23 up-and-down motion, movable rod 23 sets up on casing 17, the sub-unit connection of movable rod 23 has fixed block 24, fixed block 24 is connected with the pressing part, the pressing part is including pressing cover 29 and pressing plate 25, it is spherical structure to press cover 29, the upper end and the lower extreme of pressing cover 29 all are provided with the opening that supplies the cut-off knife subassembly to pass, the face at upper end opening and the lower extreme opening place of pressing cover 29 is the plane, the plane here indicates the face parallel with the workstation. The upper part of the pressing sleeve 29 is provided with a first annular indent 31, and the pressing plate 25 is sleeved on the first annular indent 31. An annular bulge 26 is arranged at the upper end opening of the pressing sleeve 29, a second annular concave 32 is arranged below the annular bulge 26, and the second annular concave 32 is positioned above the first annular concave 31. An elastic ring 28 and a clamp spring 27 are arranged above the pressing plate 25, the clamp spring 27 is arranged between the annular protrusion 26 and the elastic ring 28, the clamp spring 27 is arranged in the second annular concave 32, the clamp spring 27 is in contact with the annular protrusion 26 and the elastic ring 28, the lower part of the elastic ring 28 is in contact with the pressing plate 25, and the pressing piece is connected with the fixing block 24 through the pressing plate 25. Preferably, the elastic ring 28 is a rubber ring.

First cut-off knife 1 and second cut-off knife 2 set up in pressing cover 29, and first cut-off knife 1 exposes from the bottom opening part that presses cover 29, and the cut-off knife subassembly during operation, cloth are arranged in and are pressed between cover 29 and the workstation 18, and cloth pressing mechanism can press the cloth, guarantees that the cloth is in smooth state in the course of working to the cloth, avoids the cloth surface to corrugate. It is worth noting that the arrangement of the elastic ring 28 enables the cut-off knife assembly to be convenient for processing the cloth with different thicknesses, the elastic ring 28 is matched with the spherical structure of the pressing sleeve 29 due to the elasticity, when the pressing sleeve 29 presses the cloth, the elastic force of the elastic ring 28 can play a buffering effect, the situation that the pressing piece inclines when pressing the cloth with different thicknesses is avoided, and then the cut-off knife assembly cuts the cloth obliquely when processing the cloth, so that the processing effect is influenced.

The present application has been described in detail, and the principles and embodiments of the present application have been described herein using specific examples, which are provided only to help understand the present application and its core concept. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can also make several improvements and modifications, and those improvements and modifications also fall into the protection scope of the claims of the present application.

Claims (16)

1. The utility model provides a cut-off knife subassembly, its characterized in that includes blade holder (2), detachable connection has first cut-off knife (1) and second cut-off knife (3) on blade holder (2), second cut-off knife (3) set up blade holder (2) with between first cut-off knife (1), second cut-off knife (3) with first cut-off knife (1) laminating.

2. A cutting knife assembly according to claim 1, characterized in that the holder (2) is provided with a turning rod (20), and the first cutting knife (1) is connected with the holder (2) by the turning rod (20).

3. A cutting knife assembly according to claim 1, characterized in that the first cutting knife (1) comprises a knife edge portion (8), a connecting rod (7) and an adjusting rod (6), the knife edge portion (8), the connecting rod (7) and the adjusting rod (6) are integrally formed, the connecting rod (7) is arranged between the knife edge portion (8) and the adjusting rod (6), the knife edge portion (8) is arranged at the lower part of the first cutting knife (1), and the width of the connecting rod (7) and the knife edge portion (8) is smaller than the width of the connecting rod (6) and the connecting rod (7).

4. A cutter assembly according to claim 3, characterized in that the width of the blade part (8) is less than or equal to the width of the adjustment bar (6), and that one side of the adjustment bar (6) is level with one side of the connecting bar (7).

5. A cutter assembly according to claim 4, characterized in that the blade part (8) comprises a first blade (11), the lower end surface of the adjusting rod (6) and the side edge of the connecting rod (7) form a concave structure, the first blade (11) is opposite to the lower end of the adjusting rod (6), and the first blade (11) and the second cutter (3) are matched for cutting cloth.

6. A cutter assembly according to claim 5, characterized in that the second cutter (3) is arranged close to the concave structure, the lower end of the second cutter (3) being lower than the upper wall of the concave structure.

7. A cutter assembly according to claim 5, characterized in that the blade part (8) further comprises a second blade (12), the second blade (12) being located below the first blade (11), the second blade (12) being used for cutting cloth, the second blade (12) being parallel to the adjustment bar (6) in the length direction, the angle between the first blade (11) and the second blade (12) being larger than 90 degrees.

8. A cutting blade assembly according to claim 7, wherein the blade portion (8) further comprises a third cutting edge (13) and a fourth cutting edge (14), the third cutting edge (13) is arranged below the second cutting edge (12), the included angle between the third cutting edge (13) and the fourth cutting edge (14) is less than 90 degrees, one end of the fourth cutting edge (14) and the third cutting edge (13) are connected to form a sharp angle, and the other end of the fourth cutting edge (14) is located at the connection position of the connecting rod (7) and the blade portion (8).

9. A sewing machine comprising a head, said head having a cutter assembly, said cutter assembly being as claimed in any one of claims 1 to 8.

10. A machine as claimed in claim 9, characterized in that said head comprises a housing (17) and a drive mechanism, said drive mechanism being arranged outside said housing (17).

11. The sewing machine according to claim 10, characterized in that a link mechanism (15) is arranged in the housing (17), the drive mechanism comprises a first drive mechanism (16), one end of the link mechanism (15) is connected with the first drive mechanism (16), a slider (22) is connected to the link mechanism (15), the slider (22) is sleeved on the rotating rod (20), the first drive mechanism (16) is used for driving the link mechanism (15) to rotate, the rotation of the link mechanism (15) drives the slider (22) to move up and down, and the slider (22) drives the rotating rod (20) to move up and down.

12. A sewing machine according to claim 11, characterized in that the driving mechanism further comprises a second driving mechanism (19), the second driving mechanism (19) is connected with the rotating rod (20), and the second driving mechanism (19) is used for driving the first cutting knife (1) to rotate for a certain angle in the circumferential direction.

13. A sewing machine according to claim 12, characterized in that the first cutter (1) is connected to the lower part of the rotating rod (20), two stop collars (21) are sleeved on the rotating rod (20), the slider (22) is located between the two stop collars (21), the two stop collars (21) and the slider (22) are in contact, the stop collars (21) are used for axially limiting the slider (22), and the slider (22) and the stop collars (21) are mutually matched for driving the rotating rod (20) to move up and down.

14. A machine according to claim 9, wherein the head further comprises a cloth pressing mechanism, the cloth pressing mechanism comprising a movable rod (23) moving up and down, the movable rod (23) being connected to a third driving mechanism for driving the movable rod (23) to move up and down, the movable rod (23) being arranged on the housing (17).

15. The sewing machine according to claim 14, characterized in that a fixed block (24) is connected to the lower portion of the movable rod (23), a pressing piece is connected to the fixed block (24), the pressing piece comprises a pressing sleeve (29) and a pressing plate (25), the pressing plate (25) is sleeved on the pressing sleeve (29), an elastic ring (28) and a snap spring (27) are arranged above the pressing plate (25), and the elastic ring (28) is arranged between the snap spring (27) and the pressing plate (25).

16. The sewing machine according to claim 15, wherein the pressing sleeve (29) is a spherical structure, the upper end and the lower end of the pressing sleeve (29) are provided with openings for the cutter assembly to pass through, the upper end and the lower end of the pressing sleeve (29) are both flat, the upper portion of the pressing sleeve (29) is provided with a first annular recess (31), the pressing plate (25) is sleeved on the first annular recess (31), the upper end opening is provided with an annular protrusion (26), the lower portion of the annular protrusion (26) is provided with a second annular recess (32), the clamp spring (27) is arranged in the second annular recess (32), and the second annular recess (32) is located above the first annular recess (31).

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