A cutter assembly for cutting fabrics

Abstract

The present disclosure relates to the technical field of sewing machines, and particularly to a cutter assembly for cutting fabrics, which solves the problem of inconvenient installation of the cutter assembly in the prior art. A cutter assembly for cutting fabrics is provided on the sewing head of a sewing machine. The cutter assembly includes a tool holder, and a first cutter and a second cutter are detachably connected to the tool holder. The second cutter is disposed between the tool holder and the first cutter, and the second cutter is in contact with the first cutter. A rotating rod is provided on the tool holder, and the first cutter is connected to the tool holder through the rotating rod. The first cutter includes a cutting edge portion, a connecting rod, and an adjusting rod. The cutting edge portion, the connecting rod, and the adjusting rod are integrally formed. The adjusting rod is connected to the tool holder. The cutting edge portion is used for cutting fabrics. The connecting rod is disposed between the cutting edge portion and the adjusting rod. The cutting edge portion is disposed at the lower part of the first cutter. The width of the connection between the connecting rod and the cutting edge portion is smaller than the width of the connection between the adjusting rod and the connecting rod.

Description

Technical Field

[0001] The present disclosure relates to the technical field of sewing machines, and particularly to a cutter assembly for cutting fabrics. Background Art

[0002] The sewing machine manufacturing industry, as a traditional industry, has a history of more than one hundred and fifty years. In 1845, an American invented the first sewing machine. A sewing machine is a machine that uses one or more sewing threads to form one or more stitch tracks on the sewing material, so as to interweave or sew together one or more layers of sewing materials. Sewing machines can sew fabrics such as cotton, linen, silk, wool, and artificial fibers, as well as products such as leather, plastic, and paper. The stitch patterns sewn are neat, beautiful, flat and firm, with a fast sewing speed and easy to use. Now there are already many places in China where sewing art bars have been opened, allowing sewing machines to re-enter people's sight from a corner of society. Many people have bought sewing machines and used their own small ideas to modify old clothes and small bags they used to wear. Many young housewives sew clothes for their little babies by themselves, releasing motherly love, personality, and family affection.

[0003] Sewing machines generally have a cutter assembly for cutting fabrics. The traditional cutter assembly includes an upper cutter and a lower cutter. The upper cutter is fixed on the upper tool holder, and the lower cutter is arranged on the lower tool holder. The lower tool holder is arranged on the sewing machine workbench. When cutting fabrics, the upper cutter needs to perform up-and-down cutting actions and horizontal actions following the movement of the fabric. Therefore, in addition to performing up-and-down work, the tool holder also needs to perform horizontal position movement. Therefore, higher requirements are imposed on the stability and longitudinal and lateral adjustability of the tool holder to ensure that the gap between the upper cutter and the lower cutter always maintains a high degree of consistency under conditions such as the sewing machine shaking, so as to cut the fabric more neatly and beautifully. In addition, when installing the upper cutter and the lower cutter, it takes a long time to adjust the gap and coaxiality between the two, generally taking 1 - 2 days, with a high time cost and inconvenience. Summary of the Invention

[0004] Aiming at the problem of inconvenient installation of the cutter assembly in the prior art, the present disclosure provides a cutter assembly for cutting fabrics that is easy to install.

[0005] The technical solution adopted by the present disclosure to solve the above technical problems is as follows: A cutting knife assembly for cutting fabrics, the cutting knife assembly is arranged on the head of a sewing machine, the cutting knife assembly includes a knife seat, a first cutting knife and a second cutting knife are detachably connected to the knife seat, the second cutting knife is arranged between the knife seat and the first cutting knife, and the second cutting knife is in contact with the first cutting knife; a rotating rod is arranged on the knife seat, the first cutting knife is connected to the knife seat through the rotating rod, the first cutting knife includes a blade part, a connecting rod and an adjusting rod, the blade part, the connecting rod and the adjusting rod are integrally formed, the adjusting rod is connected to the knife seat, the blade part is used for cutting fabrics, the connecting rod is arranged between the blade part and the adjusting rod, the blade part is arranged at the lower part of the first cutting knife, and the width of the connection part between the connecting rod and the blade part is smaller than the width of the connection part between the adjusting rod and the connecting rod.

[0006] Compared with existing products, the beneficial effects of the present disclosure are as follows: Both the first cutting knife and the second cutting knife are detachably connected to the knife seat, which is convenient for regularly replacing the first cutting knife and the second cutting knife. The second cutting knife is in contact with the first cutting knife. Such a setting is more convenient and faster when installing the first cutting knife and the second cutting knife, and makes the stability of the cutting knife assembly better, so that the second cutting knife is better fixed, and at the same time, the relative positions of the second cutting knife and the first cutting knife are easier to adjust.

[0007] Further, a spring piece is arranged on the knife seat, and the spring piece contacts the first cutting knife, and is used to make the second cutting knife contact with the first cutting knife, so as to avoid gaps between the first cutting knife and the second cutting knife, which may affect the cutting effect.

[0008] Further, the head includes a housing and a driving mechanism, and the driving mechanism is arranged outside the housing.

[0009] Further, a connecting rod mechanism is arranged in the housing, the driving mechanism includes a first driving mechanism, one end of the connecting rod mechanism is connected to the first driving mechanism, a slider is connected to the connecting rod mechanism, the slider is sleeved on the rotating rod, the first driving mechanism is used to drive the connecting rod mechanism to rotate, the rotation of the connecting rod mechanism drives the slider to move up and down, and the slider drives the rotating rod to move up and down.

[0010] Further, the driving mechanism further includes a second driving mechanism, the second driving mechanism is connected to the rotating rod, and the second driving mechanism is used to drive the first cutting knife to rotate a certain angle in the circumferential direction.

[0011] Further, the lower part of the first cutting knife is connected to the rotating rod, two limiting sleeves are sleeved on the rotating rod, the slider is located between the two limiting sleeves, the two limiting sleeves are in contact with the slider, the limiting sleeves are used for axially limiting the slider, and the slider and the limiting sleeves cooperate with each other to drive the rotating rod to move up and down.

[0012] Further, the head further includes a cloth pressing mechanism, the cloth pressing mechanism includes a movable rod that moves up and down, the movable rod is connected to a third driving mechanism, the third driving mechanism is used to drive the movable rod to move up and down, and the movable rod is arranged on the housing.

[0013] Further, a fixed block is connected to the lower part of the movable rod, the fixed block is connected to a pressing member, the pressing member includes a pressing sleeve and a pressing plate, the pressing plate is sleeved on the pressing sleeve, an elastic ring and a snap spring are arranged above the pressing plate, and the elastic ring is arranged between the snap spring and the pressing plate.

[0014] Further, the pressing sleeve is of a spherical structure, openings for the cutting knife assembly to pass through are arranged at both the upper end and the lower end of the pressing sleeve, the planes where the upper end opening and the lower end opening of the pressing sleeve are located are both flat, a first annular concave is arranged on the upper part of the pressing sleeve, the pressing plate is sleeved on the first annular concave, an annular protrusion is arranged at the upper end opening, a second annular concave is arranged below the annular protrusion, the snap spring is arranged in the second annular concave, and the second annular concave is located above the first annular concave.

[0015] Further, the width of the blade part is less than or equal to the width of the adjusting rod, and one side of the adjusting rod is flush with one side of the connecting rod.

[0016] Further, the blade part includes a first blade, an inner concave structure is formed by the first blade, the lower end surface of the adjusting rod and the side of the connecting rod, the first blade is opposite to the lower end of the adjusting rod, and the first blade cooperates with the second cutting knife to cut the cloth.

[0017] Further, the blade part further includes a second blade, the second blade is below the first blade, the second blade is used to cut the cloth, the second blade is parallel to the adjusting rod in the length direction, and the included angle between the first blade and the second blade is greater than 90 degrees.

[0018] Further, the blade part further includes a third blade and a fourth blade, the third blade is arranged below the second blade, the included angle between the third blade and the fourth blade is less than 90 degrees, one end of the fourth blade is connected to the third blade to form a sharp angle, one end of the fourth blade is connected to the third blade, and the other end of the fourth blade is located at the connection of the connecting rod and the blade part.

[0019] Further, the second cutting knife is arranged at a position close to the inner concave structure, and the lower end of the second cutting knife is lower than the upper end of the inner concave structure. Such a setting facilitates the second cutting knife to cut the cloth.

[0020] In some embodiments, a first connecting member is connected to the rotating rod, and the first cutting knife is connected to the rotating rod through the first connecting member.

[0021] In some embodiments, a first clamping member is provided on the rotating rod, and a second clamping member that cooperates with the first clamping member is provided on the first cutting knife, and the rotating rod and the first cutting knife are clamped.

[0022] In some embodiments, a first plugging member is provided on the rotating rod, and a second plugging member that cooperates with the first plugging member is provided on the first cutting knife, and the rotating rod and the first cutting knife are plugged.

[0023] In some embodiments, a second connecting member is connected to the tool holder, and the second cutting knife is connected to the tool holder through the second connecting member.

[0024] In some embodiments, a third clamping member is provided on the tool holder, and a fourth clamping member that cooperates with the third clamping member is provided on the second cutting knife, and the tool holder and the second cutting knife are clamped.

[0025] In some embodiments, a third plugging member is provided on the tool holder, and a fourth plugging member that cooperates with the third plugging member is provided on the second cutting knife, and the tool holder and the second cutting knife are plugged. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present application will be further described in detail below in conjunction with the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present application. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0027] Figure 1 is one of the structural schematic diagrams of a cutting knife assembly for cutting fabrics according to the present disclosure;

[0028] Figure 2 is the present disclosure Figure 1 a partial enlarged view of part A therein;

[0029] Figure 3 is one of the exploded views of a cutting knife assembly for cutting fabrics according to the present disclosure;

[0030] Figure 4 is one of the structural schematic diagrams of the first cutting knife according to the present disclosure;

[0031] Figure 5 is another structural schematic diagram of the first cutting knife according to the present disclosure;

[0032] Figure 6 It is the third schematic structural diagram of the first cutting knife of the present disclosure;

[0033] Figure 7 It is the second schematic structural diagram of a cutting knife assembly for cutting fabrics of the present disclosure;

[0034] Figure 8 It is the third schematic structural diagram of a cutting knife assembly for cutting fabrics of the present disclosure;

[0035] Figure 9 It is the second exploded view of a cutting knife assembly for cutting fabrics of the present disclosure;

[0036] Figure 10 It is the third exploded view of a cutting knife assembly for cutting fabrics of the present disclosure;

[0037] Figure 11 It is the fourth schematic structural diagram of a cutting knife assembly structure for cutting fabrics of the present disclosure;

[0038] Figure 12 It is the present disclosure Figure 11 The partial enlarged view at position B in it;

[0039] Figure 13 It is the schematic structural diagram of the pressing sleeve of the present disclosure;

[0040] Figure 14 It is the cross-sectional view of a cutting knife assembly for cutting fabrics of the present disclosure;

[0041] Figure 15 It is the present disclosure Figure 14 The partial enlarged view at position C in it;

[0042] Figure 16 It is the fifth schematic structural diagram of a cutting knife assembly structure for cutting fabrics of the present disclosure;

[0043] Figure 17 It is the present disclosure Figure 16 The partial enlarged view at position D in it.

[0044] Explanation of reference numerals:

[0045] 1. First cutting knife; 2. Knife holder; 3. Second cutting knife; 4. First connecting piece; 6. Adjusting rod; 7. Connecting rod; 8. Blade part, 11. First blade; 12. Second blade; 13. Third blade; 14. Fourth blade; 15. Link mechanism; 16. First driving mechanism; 17. Housing; 18. Workbench; 19. Second driving mechanism; 20. Rotating rod; 21. Limiting sleeve; 22. Slide block; 23. Movable rod; 24. Fixed block; 25. Pressing plate; 26. Annular protrusion; 27. Snap ring; 28. Elastic ring; 29. Pressing sleeve; 30. Cylinder; 31. First annular concave; 32. Second annular concave; 33. Elastic piece. Detailed implementation manners

[0046] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the following provides a detailed, clear, and complete description of the present disclosure in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0047] In the description of the present invention, if the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0048] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0049] An embodiment of the present disclosure discloses a cutting knife assembly for cutting fabrics. The cutting knife assembly is arranged on the head of a sewing machine, and the head is arranged on the workbench 18 of the sewing machine. See Figures 1-17 as shown.

[0050] A cutting knife assembly for cutting fabrics includes a knife holder 2. The first cutting knife 1 and the second cutting knife 3 are detachably connected to the knife holder 2. The second cutting knife 3 is arranged between the knife holder 2 and the first cutting knife 1, and the second cutting knife 3 is in contact with the first cutting knife 1. A rotating rod 20 is arranged on the knife holder 2, and the first cutting knife 1 is connected to the knife holder 2 through the rotating rod 20. Such a setting makes it more convenient to install or replace the cutting knives 3 and 1, saving time.

[0051] It should be noted that a shrapnel 33 is provided on the tool holder 2. The shrapnel 33 contacts the first cutting knife 1 and is used to fit the second cutting knife 3 and the first cutting knife 1 together, so as to avoid a gap between the first cutting knife 1 and the second cutting knife 3 after long-term use of the cutting knife assembly, which may affect the cutting effect.

[0052] The machine head includes a housing 17 and a driving mechanism. The driving mechanism is arranged outside the housing 17. A connecting rod mechanism 15 is arranged inside the housing 17. The driving mechanism includes a first driving mechanism 16. One end of the connecting rod mechanism 15 is connected to the first driving mechanism 16. The connecting rod mechanism 15 includes a connecting rod, and a slider 22 is connected to the connecting rod. The slider 22 is sleeved on a rotating rod 20. The first driving mechanism 16 is used to drive the connecting rod mechanism 15 to rotate. The rotation of the connecting rod mechanism 15 drives the slider 22 to move up and down. The slider 22 drives the rotating rod 20 to move up and down, and then drives the tool holder 2 to move up and down. The driving mechanism further includes a second driving mechanism 19. The second driving mechanism 19 is connected to the rotating rod 20. The second driving mechanism 19 is used to drive the first cutting knife 1 to rotate a certain angle in the circumferential direction, which is convenient for the first cutting knife 1 to cut the fabric. Preferably, the driving mechanism is a motor.

[0053] The first cutting knife 1 is connected to the lower part of the rotating rod 20. Two limiting sleeves 21 are sleeved on the rotating rod 20. The limiting sleeves 21 are in a tightly held state with the rotating rod 20. The slider 22 is located between the two limiting sleeves 21. The two limiting sleeves 21 contact the slider 22. The limiting sleeves 21 are used to axially limit the slider 22. The slider 22 and the limiting sleeves 21 cooperate with each other to drive the rotating rod 20 to move up and down. Driven by the second driving mechanism 19, the rotating rod 20 moves circumferentially, and the two limiting sleeves 21 move circumferentially with the rotating rod 20 while the slider 22 remains stationary. Driven by the first driving mechanism 16, the connecting rod mechanism 15 drives the slider 22 to move up and down. Due to the axial limitation of the slider 22 by the limiting sleeves 21, the rotating rod 20 follows the slider 22 to move up and down, driving the tool holder 2 to move up and down, thereby driving the first cutting knife 1 and the second cutting knife 3 to move up and down.

[0054] The head also includes a cloth pressing mechanism. The cloth pressing mechanism includes a movable rod 23 that moves up and down. The movable rod 23 is connected to a cylinder 30. The cylinder 30 is used to drive the movable rod 23 to move up and down. The movable rod 23 is arranged on the housing 17. A fixed block 24 is connected to the lower part of the movable rod 23. The fixed block 24 is connected to a pressing member. The pressing member includes a pressing sleeve 29 and a pressing plate 25. The pressing sleeve 29 is a spherical structure. Openings for the cutting tool assembly to pass through are provided at both the upper end and the lower end of the pressing sleeve 29. The planes where the upper opening and the lower opening of the pressing sleeve 29 are located are both flat surfaces. Here, the flat surface refers to the surface parallel to the workbench. A first annular concave 31 is provided at the upper part of the pressing sleeve 29. The pressing plate 25 is sleeved on the first annular concave 31. An annular protrusion 26 is provided at the upper opening of the pressing sleeve 29. A second annular concave 32 is provided below the annular protrusion 26. The second annular concave 32 is located above the first annular concave 31. An elastic ring 28 and a snap spring 27 are provided above the pressing plate 25. The snap spring 27 is arranged between the annular protrusion 26 and the elastic ring 28. The snap spring 27 is arranged in the second annular concave 32, and the snap 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. The pressing member is connected to the fixed block 24 through the pressing plate 25. Preferably, the elastic ring 28 is a rubber ring.

[0055] The first cutting tool 1 and the second cutting tool 3 are arranged in the pressing sleeve 29. The first cutting tool 1 is exposed from the bottom opening of the pressing sleeve 29. When the cutting tool assembly works, the cloth is placed between the pressing sleeve 29 and the workbench 18. The cloth pressing mechanism will press the cloth to ensure that the cloth is in a flat state during the processing of the cloth, and prevent wrinkles from appearing on the surface of the cloth. It should be noted that the setting of the elastic ring 28 makes it convenient for the cutting tool assembly to process cloths of different thicknesses. Because the elastic ring 28 has elasticity, and in cooperation with the spherical structure of the pressing sleeve 29, when the pressing sleeve 29 presses the cloth, the elastic force of the elastic ring 28 can play a buffering effect, preventing the pressing member from tilting when pressing cloths of different thicknesses, and then causing the cutting tool assembly to cut obliquely when processing the cloth, affecting the processing effect.

[0056] The first cutting tool 1 includes a blade part 8, a connecting rod 7 and an adjusting rod 6. The adjusting rod 6 is connected to the tool holder 2. The blade part 8, the connecting rod 7 and the adjusting rod 6 are integrally formed. The connecting rod 7 is arranged between the blade part 8 and the adjusting rod 6. The blade part 8 is arranged at the lower part of the first cutting tool 1. The width of the connecting rod 7 at the connection with the blade part 8 is smaller than the width of the adjusting rod 6 at the connection with the connecting rod 7, so that the lower end of the adjusting rod 6 and the connecting rod 7 form a "7-shaped". The width of the blade part 8 is less than or equal to the width of the adjusting rod 6. One side of the adjusting rod 6 is flush with one side of the connecting rod 7, so that the blade part 8 is kept within the width range of the adjusting rod 6 for better cutting.

[0057] The blade portion 8 includes a first blade 11 for cutting the fabric. The first blade 11, the adjusting rod 6, and the connecting rod 7 form a concave structure. The lower ends of the first blade 11 and the adjusting rod 6 are opposite to each other. The first blade 11 cooperates with the second cutter 3 to cut the fabric. The second cutter 3 is arranged at a position close to the concave structure. The side surface of the second cutter 3 is attached to the adjusting rod 6. The lower end of the second cutter 3 is lower than the upper end of the concave structure. Such a setting facilitates the second cutter 3 to cut the fabric.

[0058] It should be noted that the blade portion 8 further includes a second blade 12. The second blade 12 is below the first blade 11. The second blade 12 is used for cutting the fabric. The second blade 12 is parallel to the adjusting rod 6 in the length direction. The included angle between the first blade 11 and the second blade 12 is greater than 90 degrees. Such a setting makes it easier for the first blade 11 and the second blade 12 to cooperate with each other when cutting the fabric and is more convenient for cutting the fabric.

[0059] The blade portion further includes a third blade 13 and a fourth blade 14. The third blade 13 is arranged below the second blade 12. The included angle between the third blade 13 and the fourth blade 14 is less than ninety degrees. One end of the fourth blade 14 is connected to the third blade 13 to form a sharp angle. The third blade 13 and the fourth blade 14 are used for piercing the fabric. The sharp angle is more convenient for operating on the fabric. One end of the fourth blade 14 is connected to the third blade 13, and the other end of the fourth blade 14 is located at the connection between the connecting rod 7 and the blade portion 8.

[0060] In some embodiments, a first connecting member 4 is connected to the rotating rod 20. The first cutter 1 is connected to the rotating rod 20 through the first connecting member 4. Specifically, the first connecting member 4 can be a connecting piece or a connecting block. A first mounting hole is provided on the rotating rod 20. A second mounting hole is provided on the first connecting member 4 and is matched with the first mounting hole. A first mounting groove is provided on the adjusting rod 6 and is located between the first mounting hole and the second mounting hole. The three are connected by bolts, with reliable connection and convenient installation.

[0061] In some embodiments, a first clamping member is provided on the rotating rod 20. A second clamping member that cooperates with the first clamping member is provided on the first cutter 1. The rotating rod 20 and the first cutter 1 are clamped, with simple and convenient operation.

[0062] In some embodiments, a first plug-in member is provided on the rotating rod 20. A second plug-in member that cooperates with the first plug-in member is provided on the first cutter 1. The rotating rod 20 and the first cutter 1 are plugged in, with reliable connection and simple structure.

[0063] It can be understood that the above only lists several connection methods between the tool holder 2 and the first cutter 1. The tool holder 2 and the first cutter 1 can also be other detachable connection methods, which are not specifically limited herein.

[0064] In some embodiments, a second connecting member is connected to the tool holder 2, and the second cutting tool 3 is connected to the tool holder 2 through the second connecting member. Specifically, the second connecting member may be a connecting piece or a connecting block. A third mounting hole is provided on the tool holder 2, and a fourth mounting hole matching the third mounting hole is provided on the second connecting member. A second mounting groove is provided on the upper part of the second cutting tool 3, and the second mounting groove is located between the third mounting hole and the fourth mounting hole. The three are connected by bolts, with reliable connection and convenient installation.

[0065] In some embodiments, a third clamping member is provided on the tool holder 2, and a fourth clamping member cooperating with the third clamping member is provided on the second cutting tool 3, and the tool holder 2 and the second cutting tool 3 are clamped.

[0066] In some embodiments, a third plugging member is provided on the tool holder 2, and a fourth plugging member cooperating with the third plugging member is provided on the second cutting tool 3, and the tool holder 2 and the second cutting tool 3 are plugged, with a simple structure and convenient replacement of the second cutting tool 3.

[0067] It can be understood that the above only lists several connection methods between the tool holder 2 and the second cutting tool 3. The tool holder 2 and the second cutting tool 3 can also be other detachable connection methods, which are not specifically limited herein.

[0068] It should be noted that the cutting edges of the cutting edge part are all single-sided knives. The single-sided knife has only one angle, and the angle is very small and very sharp. During the process of cutting the fabric, the fabric can be made relatively flat and there will be no frayed edges.

[0069] The above has introduced the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application and the core idea. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A cutting knife assembly for cutting fabrics, characterized in that, The cutting knife assembly is arranged on the head of the sewing machine. It includes a knife base (2), and a first cutting knife (1) and a second cutting knife (3) are detachably connected to the knife base (2). The second cutting knife (3) is arranged between the knife base (2) and the first cutting knife (1), and the second cutting knife (3) is in contact with the first cutting knife (1). A rotating rod (20) is arranged on the knife base (2), and the first cutting knife (1) is connected to the knife base (2) through the rotating rod (20). The first cutting knife (1) includes a blade part (8), a connecting rod (7) and an adjusting rod (6). The blade part (8), the connecting rod (7) and the adjusting rod (6) are integrally formed. The connecting rod (7) is arranged between the blade part (8) and the adjusting rod (6). The blade part (8) is arranged at the lower part of the first cutting knife (1). The width of the connecting rod (7) at the connection with the blade part (8) is smaller than the width of the adjusting rod (6) at the connection with the connecting rod (7).

2. The cutter assembly for cutting fabric according to claim 1, wherein, A spring piece (33) is arranged on the knife base (2). The spring piece (33) contacts the first cutting knife (1) and is used to make the second cutting knife (3) contact with the first cutting knife (1).

3. The cutting tool assembly for cutting fabrics according to claim 1, characterized in that, The head includes a housing (17) and a driving mechanism. The driving mechanism is arranged outside the housing (17).

4. The cutting tool assembly for cutting fabrics according to claim 3, wherein, A connecting rod mechanism (15) is arranged in the housing (17). The driving mechanism includes a first driving mechanism (16). One end of the connecting rod mechanism (15) is connected to the first driving mechanism (16). A slider (22) is connected to the connecting rod mechanism (15). The slider (22) is sleeved on the rotating rod (20). The first driving mechanism (16) is used to drive the connecting rod mechanism (15) to rotate. The rotation of the connecting rod 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.

5. The cutting tool assembly for cutting fabric according to claim 4, wherein, The driving mechanism further includes a second driving mechanism (19). The second driving mechanism (19) is connected to the rotating rod (20), and the second driving mechanism (19) is used to drive the first cutting knife (1) to rotate a certain angle in the circumferential direction.

6. The cutting tool assembly for cutting fabric according to claim 5, wherein, The first cutting knife (1) is connected to the lower part of the rotating rod (20). Two limiting sleeves (21) are sleeved on the rotating rod (20). The slider (22) is located between the two limiting sleeves (21). The two limiting sleeves (21) contact the slider (22). The limiting sleeves (21) are used for axially limiting the slider (22). The slider (22) and the limiting sleeves (21) cooperate with each other to drive the rotating rod (20) to move up and down.

7. A cutter assembly for cutting fabrics according to claim 1, characterized in that, The head further includes a cloth pressing mechanism. The cloth pressing mechanism includes a movable rod (23) that moves up and down. The movable rod (23) is connected to a third driving mechanism. The third driving mechanism is used to drive the movable rod (23) to move up and down. The movable rod (23) is arranged on the housing (17).

8. The cutter assembly for cutting fabrics according to claim 7, characterized in that, A fixing block (24) is connected to the lower part of the movable rod (23). The fixing block (24) is connected with a pressing member, and the pressing member includes 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).

9. The cutting tool assembly for cutting fabric according to claim 8, wherein, The pressing sleeve (29) is of a spherical structure. Openings for the cutting knife assembly to pass through are arranged at both the upper end and the lower end of the pressing sleeve (29). The planes where the upper opening and the lower opening of the pressing sleeve (29) are located are both flat. A first annular concave (31) is arranged on the upper part of the pressing sleeve (29). The pressing plate (25) is sleeved on the first annular concave (31). An annular protrusion (26) is arranged at the upper opening. A second annular concave (32) is arranged below the annular protrusion (26). The snap spring (27) is arranged in the second annular concave (32), and the second annular concave (32) is located above the first annular concave (31).

10. The cutting tool assembly for cutting fabrics according to claim 1, characterized in that, A first connecting member (4) is connected to the rotating rod (20), and the first cutting knife (1) is connected to the rotating rod (20) through the first connecting member (4).

11. The cutting tool assembly for cutting fabrics according to claim 1, characterized in that, A first clamping member is arranged on the rotating rod (20), and a second clamping member that cooperates with the first clamping member is arranged on the first cutting knife (1). The rotating rod (20) and the first cutting knife (1) are clamped together.

12. The cutter assembly for cutting fabric according to claim 1, wherein, A first plugging member is arranged on the rotating rod (20), and a second plugging member that cooperates with the first plugging member is arranged on the first cutting knife (1). The rotating rod (20) and the first cutting knife (1) are plugged together.

13. The cutter assembly for cutting fabric according to claim 1, characterized in that, A second connecting member is connected to the tool holder (2), and the second cutting knife (3) is connected to the tool holder (2) through the second connecting member.

14. A cutter assembly for cutting fabrics according to claim 1, characterized in that, A third clamping member is arranged on the tool holder (2), and a fourth clamping member that cooperates with the third clamping member is arranged on the second cutting knife (3). The tool holder (2) and the second cutting knife (3) are clamped together.

15. A cutter assembly for cutting fabrics according to claim 1, characterized in that, A third plugging member is arranged on the tool holder (2), and a fourth plugging member that cooperates with the third plugging member is arranged on the second cutting knife (3). The tool holder (2) and the second cutting knife (3) are plugged together.

16. The cutting tool assembly for cutting fabrics according to claim 1, wherein, The width of the blade part (8) is less than or equal to the width of the adjusting rod (6), and one side of the adjusting rod (6) is flush with one side of the connecting rod (7).

17. A cutter assembly for cutting fabrics according to claim 16, characterized in that, The blade part (8) includes a first blade (11). An inner concave structure is formed by the first blade (11), the lower end surface of the adjusting rod (6) and the side of the connecting rod (7). The first blade (11) is opposite to the lower end of the adjusting rod (6). The first blade (11) cooperates with the second cutting knife (3) for shearing cloth.

18. A cutter assembly for cutting fabrics according to claim 17, characterized in that, The second cutting knife (3) is arranged at a position close to the inner concave structure, and the lower end of the second cutting knife (3) is lower than the upper wall of the inner concave structure.

19. The cutter assembly for cutting fabrics according to claim 17, wherein, The blade part (8) further includes a second blade (12). The second blade (12) is located below the first blade (11). The second blade (12) is used for cutting the fabric. The second blade (12) is parallel to the adjusting rod (6) in the length direction. The included angle between the first blade (11) and the second blade (12) is greater than 90 degrees.

20. A cutter assembly for cutting fabric according to claim 19, wherein, The blade part (8) further includes a third blade (13) and a fourth blade (14). The third blade (13) is arranged below the second blade (12). The included angle between the third blade (13) and the fourth blade (14) is less than 90 degrees. One end of the fourth blade (14) is connected to the third blade (13) to form a sharp angle. The other end of the fourth blade (14) is located at the connection part of the connecting rod (7) and the blade part (8).

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