Handheld sewing device

Abstract

The utility model discloses a handheld sewing device, which relates to the technical field of sewing equipment. The handheld sewing device includes a main structure, a sewing assembly, and a material pressing assembly; wherein the sewing assembly can be raised and lowered on the main structure, and the sewing assembly is provided with a sewing needle; the material pressing assembly is provided with a pressing plate for pressing the material to be sewn, and the pressing plate is installed on the main structure, and the installation position of the pressing plate on the main structure along the vertical direction is adjustable. In the process of using the handheld sewing device provided by the utility model, the material to be sewn needs to be placed in the gap between the pressing plate and the main structure, and the material to be sewn is sewn by cooperating with the sewing assembly and other structures.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing equipment, and more specifically to a handheld sewing device. Background Art

[0002] There are two current solutions to the problem of sewing multiple layers of fabric together:

[0003] The first method is manual needle threading and sewing. This method is less efficient, the sewing thread cannot be left too long, and continuous pulling and extrusion requires the use of construction workers;

[0004] The second method is to use a large electric sewing device. However, the electric sewing device is large in size and cannot be used for products with narrow preforming mold space. At the same time, the electric sewing device is generally heavy and the construction workers cannot hold it for a long time.

[0005] In summary, how to provide a handheld sewing device that is applicable to sewing multi-layer materials is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a handheld sewing device, which, during actual use, can adjust the gap size between the pressing plate and the main structure for placing materials by adjusting the installation position of the pressing plate in the vertical direction, so as to be suitable for a handheld sewing device for sewing multiple layers of materials.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A handheld sewing device, comprising:

[0009] Main structure;

[0010] A sewing assembly, which is liftably arranged on the main structure, and the sewing assembly is provided with a sewing needle;

[0011] The material pressing assembly is provided with a pressing plate for pressing the material to be sewn, the pressing plate is installed on the main structure, and the installation position of the pressing plate along the vertical direction of the main structure is adjustable.

[0012] Optionally, the pressing component further comprises:

[0013] An adjusting nut, wherein the main structure is provided with an externally threaded boss, and the adjusting nut is threadably matched with the externally threaded boss;

[0014] an elastic member, one end of which abuts against the main structure and the other end of which abuts against the upper surface of the pressing plate, and is used to elastically press the pressing plate against the adjusting nut;

[0015] By screwing the adjusting nut, the size of the gap between the bottom surface of the pressing plate and the main structure for placing the material to be sewn can be adjusted.

[0016] Optionally, the external threaded boss is a hollow structure, and the sewing component is disposed through the external threaded boss.

[0017] Optionally, the main structure includes a first crossbeam, a vertical beam and a second crossbeam, and the first crossbeam, the vertical beam and the second crossbeam are connected in sequence to form a U-shaped structure. The first crossbeam is provided with the pressing assembly and the sewing assembly, and the second crossbeam is provided with a thread hooking assembly for cooperating with the sewing assembly.

[0018] Optionally, a transmission assembly is further included, and the transmission assembly includes:

[0019] A rocker, wherein a first bevel gear is disposed at the end of the rocker, and the length direction of the rocker extends in a direction perpendicular to the vertical beam;

[0020] A first vertical transmission shaft is arranged along the extension direction of the vertical beam, one end of the first vertical transmission shaft is provided with a second bevel gear for meshing and transmitting with the first bevel gear, and the other end of the first vertical transmission shaft is provided with a third bevel gear;

[0021] A second vertical transmission shaft is arranged along the extension direction of the vertical beam, one end of the second vertical transmission shaft is provided with a fourth bevel gear for meshing and transmitting with the first bevel gear, and the other end of the second vertical transmission shaft is provided with a fifth bevel gear;

[0022] A first transverse transmission shaft is arranged on the first transverse beam along the extension direction of the first transverse beam, one end of the first transverse transmission shaft is provided with a sixth bevel gear for meshing and transmitting with the third bevel gear, and the other end is provided with a cam; the sewing assembly is provided with an extension piece for contacting the upper side of the outer edge of the cam to drive the sewing assembly to rise and fall;

[0023] A second transverse transmission shaft is arranged on the second transverse beam along the extension direction of the second transverse beam, one end of the second transverse transmission shaft is provided with a seventh bevel gear for meshing and transmitting with the fifth bevel gear, and the other end is provided with a ratchet; the ratchet is used to cooperate with the wire hook assembly.

[0024] Optionally, the vertical beam is provided with a mounting seat for mounting the yarn bobbin, the mounting seat is provided with at least two protruding columns, and the yarn bobbin is rotatably arranged on the protruding columns.

[0025] Optionally, the first crossbeam, the vertical beam and the second crossbeam are all provided with threading holes for passing yarn;

[0026] The handheld sewing device further comprises a first protective cover sleeved on the outer periphery of the first crossbeam and a second protective cover sleeved on the outer periphery of the second crossbeam;

[0027] The first cross beam, the vertical beam, and the second cross beam are plug-connected in sequence;

[0028] A first guide plate and a second guide plate that are tilted upward are arranged on both sides of the bottom surface of the pressing plate for contacting the material to be sewn. The first guide plate and the second guide plate are arranged on both sides of the bottom of the pressing plate.

[0029] Optionally, the first cross beam comprises a first main rod and a first extension rod, one end of the first extension rod is detachably connected to the vertical beam, one end of the first main rod is provided with the sewing assembly and the pressing assembly, and the other end of the first main rod is detachably connected to the first extension rod or the vertical beam;

[0030] The second cross beam includes a second main rod and a second extension rod, one end of the second extension rod is detachably connected to the vertical beam, and one end of the second main rod is detachably connected to the second extension rod or the vertical beam.

[0031] Optionally, the first transverse transmission shaft comprises a first main body transmission shaft, a first extended transmission shaft, and a second main body transmission shaft, one end of the first main body transmission shaft is provided with the cam, and the other end is detachably connected to the first extended transmission shaft, the other end of the first extended transmission shaft is detachably connected to the second main body transmission shaft, and the other end of the second main body transmission shaft is provided with the sixth bevel gear;

[0032] The second transverse transmission shaft includes a third main transmission shaft, a second extended transmission shaft, and a fourth main transmission shaft. The ratchet is provided at one end of the third main transmission shaft, and the other end is detachably connected to the second extended transmission shaft. The other end of the second extended transmission shaft is detachably connected to the fourth main transmission shaft, and the seventh bevel gear is provided at the other end of the fourth main transmission shaft.

[0033] Optionally, the first main rod and the first extension rod, the second main rod and the second extension rod, the first main transmission shaft and the first extension transmission shaft, the first extension transmission shaft and the second main transmission shaft, the third main transmission shaft and the second extension transmission shaft, and the second extension transmission shaft and the fourth main transmission shaft are all plug-connected.

[0034] When using the handheld sewing device provided by the utility model, the material to be sewn needs to be placed in the gap between the pressing plate and the main structure, and the material to be sewn is sewn by cooperating with the sewing assembly and other structures.

[0035] In actual use, the gap between the pressing plate and the main structure can be adjusted by adjusting the installation position of the pressing plate in the vertical direction to adapt to materials to be sewn with different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0037] Figure 1 This is a structural schematic diagram of a specific embodiment 1 of the handheld sewing device provided by the utility model;

[0038] Figure 2 for Figure 1 A schematic diagram of the internal structure of the handheld sewing device after the protective cover is removed;

[0039] Figure 3 This is a structural schematic diagram of a specific embodiment 2 of the handheld sewing device provided by the utility model;

[0040] Figure 4 for Figure 3 A schematic diagram of the internal structure of the handheld sewing device after the protective cover is removed;

[0041] Figure 5 is a structural schematic diagram of the first main body rod in the first crossbeam;

[0042] Figure 6 is a schematic structural diagram of a first extension rod in a first crossbeam;

[0043] Figure 7 It is a structural schematic diagram of the vertical beam and the mounting base.

[0044] Figure 1-Figure 7 middle:

[0045] 1-first protective cover, 2-elastic member, 3-adjusting nut, 4-rebound height limiting nut, 5-sewing needle, 6-pressing plate, 7-second protective cover, 8-first crossbeam, 9-vertical beam, 10-second crossbeam, 11-extension member, 12-up and down motion rod locking nut, 13-up and down motion rod tensioning spring assembly, 14-hook thread assembly, 15-second transverse transmission shaft, 16-mounting seat, 17-yarn bobbin, 18-rocker, 19-yarn bobbin fixed end cap, 20-first vertical Transmission shaft, 21-sixth bevel gear, 22-first lateral transmission shaft, 23-cam, 24-yarn tensioner, 25-vertical protective cover, 26-convex column, 27-second vertical transmission shaft, 28-first main rod, 29-first extension rod, 30-upper extension beam cover, 31-lower extension beam cover, 32-coupling, 33-second extension rod, 34 is the first transmission extension shaft, 35 is the second transmission extension shaft, 36 is the first transmission shaft body, 37 is the second transmission shaft body. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] The core of the utility model is to provide a handheld sewing device. In actual use, the gap size between the pressing plate and the main structure for placing materials can be adjusted by adjusting the installation position of the pressing plate in the vertical direction, so as to be suitable for a handheld sewing device for sewing multiple layers of materials.

[0048] The present specific embodiment discloses a handheld sewing device, comprising a main structure, a sewing assembly, and a material pressing assembly; wherein the sewing assembly is arranged on the main structure in a liftable manner, and the sewing assembly is provided with a sewing needle 5; the material pressing assembly is provided with a pressing plate 6 for pressing the material to be sewn, and the pressing plate 6 is installed on the main structure, and the installation position of the pressing plate 6 on the main structure along the vertical direction is adjustable.

[0049] It should be noted that the main structure provided in this specific embodiment is installed with a thread hook component 14, and the sewing of materials can be achieved through the cooperation of the sewing component and the thread hook component 14; in view of the different thicknesses of multi-layer materials and single-layer materials, the installation position of the pressure plate 6 in the vertical direction can be adjusted to adapt.

[0050] Specifically, the pressure plate 6 can be slidably installed on the main structure in the vertical direction, or a plurality of installation positions spaced apart in the vertical direction can be set on the main structure, and the pressure plate 6 can be installed at different installation heights for different installation positions, or other installation methods that meet the requirements can be used.

[0051] When using the handheld sewing device provided in this specific embodiment, the material to be sewn needs to be placed in the gap between the pressing plate 6 and the main structure, and the material to be sewn is sewn by cooperating with the sewing assembly and other structures.

[0052] In actual use, the gap between the pressing plate 6 and the main structure can be adjusted by adjusting the installation position of the pressing plate 6 in the vertical direction to adapt to materials to be sewn with different thicknesses.

[0053] In a specific embodiment, if Figure 1 , Figure 2 As shown, the pressing assembly also includes: an adjusting nut 3, a main structure is provided with an external threaded boss, and the adjusting nut 3 is threadedly matched with the external threaded boss; one end of the elastic member 2 abuts against the main structure, and the other end abuts against the upper surface of the pressing plate 6, which is used to elastically press the pressing plate 6 to the adjusting nut 3; by screwing the adjusting nut 3, the gap size between the bottom surface of the pressing plate 6 and the main structure for placing the material to be sewn can be adjusted.

[0054] In this specific embodiment, the elastic member 2 can be set as a spring. Of course, it can also be set as other structures that meet the requirements. It is determined according to the actual situation and will not be described in detail here.

[0055] During actual use, the adjusting nut 3 is screwed forward to move the adjusting nut 3 downward relative to the external threaded boss, and the pressing plate 6 moves downward under the elastic force of the elastic member 2, so that the gap size between the bottom surface of the pressing plate 6 and the main structure for placing the material to be sewn can be reduced, which is suitable for the case where the material thickness is reduced; the adjusting nut 3 is screwed backward to move the adjusting nut 3 upward relative to the external threaded boss, and the pressing plate 6 moves upward accordingly, so that the gap size between the bottom surface of the pressing plate 6 and the main structure for placing the material to be sewn can be increased, which is suitable for the case where the material thickness is increased.

[0056] Specifically, the external thread boss can be set as a hollow structure, and the sewing component is set through the external thread boss.

[0057] like Figure 2As shown, an upper side of the first crossbeam 8 of the main structure is provided with an up-and-down movement rod tension spring assembly 13, one end of which abuts against the first crossbeam 8 and the other end abuts against the up-and-down movement rod locking nut 12, and the up-and-down movement rod locking nut 12 is connected to the sewing assembly. By screwing the up-and-down movement rod locking nut 12, the setting height of the sewing assembly can be adjusted to adjust the height position of the sewing needle 5. The sewing assembly is provided with a rebound height limiting nut 4, which can be used to limit the screwing distance of the adjustment nut 3. When the adjustment nut 3 is screwed to contact the rebound height limiting nut 4, the adjustment nut 3 cannot continue to move downward.

[0058] In a specific embodiment, the main structure includes a first cross beam 8, a vertical beam 9 and a second cross beam 10, which are connected in sequence to form a U-shaped structure. The first cross beam 8 is provided with a material pressing component and a sewing component, and the second cross beam 10 is provided with a thread hooking component 14 for cooperating with the sewing component.

[0059] The handheld sewing device also includes a transmission assembly, which includes a rocker 18, a first vertical transmission shaft 20, a second vertical transmission shaft 27, a first transverse transmission shaft 22 and a second transverse transmission shaft 15, wherein a first bevel gear is provided at the end of the rocker 18, and the length direction of the rocker 18 has an extension in a direction perpendicular to the vertical beam 9; the first vertical transmission shaft 20 is arranged along the extension direction of the vertical beam 9, one end of the first vertical transmission shaft 20 is provided with a second bevel gear for meshing with the first bevel gear for transmission, and the other end is provided with a third bevel gear; the second vertical transmission shaft 27 is arranged along the extension direction of the vertical beam 9, one end of the second vertical transmission shaft 27 is provided with a second bevel gear for meshing with the first bevel gear for transmission The fourth bevel gear that is movable is provided at the other end, and the fifth bevel gear is provided at the other end; the first transverse transmission shaft 22 is arranged on the first transverse beam 8 along the extension direction of the first transverse beam 8, one end of the first transverse transmission shaft 22 is provided with a sixth bevel gear 21 for meshing and transmitting with the third bevel gear, and the other end is provided with a cam 23; the sewing component is provided with an extension piece 11 for contacting the upper side of the outer edge of the cam 23 to drive the sewing component to rise and fall; the second transverse transmission shaft 15 is arranged on the second transverse beam 10 along the extension direction of the second transverse beam 10, one end of the second transverse transmission shaft 15 is provided with a seventh bevel gear for meshing and transmitting with the fifth bevel gear, and the other end is provided with a ratchet; the ratchet is used to cooperate with the line hook component 14.

[0060] During actual use, by rotating the rocker 18, the rocker 18 is driven to rotate, thereby driving the first vertical transmission shaft 20 and the second vertical transmission shaft 27 to rotate, the first vertical transmission shaft 20 drives the first transverse transmission shaft 22 to rotate, thereby driving the cam 23 to rotate, the cam 23 drives the extension piece 11 to rise and fall, thereby driving the sewing needle 5 of the sewing assembly to rise and fall; the second vertical transmission shaft 27 drives the second transverse transmission shaft 15 to rotate, thereby driving the ratchet to rotate, the ratchet cooperates with the thread hooking assembly 14 to realize the action of the thread hooking assembly 14; the first transverse transmission shaft 22 and the second transverse transmission shaft 15 rotate synchronously, which can realize the coordination of the lifting and lowering of the sewing needle 5 and the thread hooking action to realize sewing.

[0061] like Figure 2 As shown, the vertical beam 9 is provided with a mounting seat 16 for mounting a yarn drum 17, and the mounting seat 16 is provided with at least two bosses 26. The yarn drum 17 is rotatably arranged on the bosses 26, and the yarn drum 17 is sleeved on the bosses 26. A yarn drum fixing end cap 19 is provided on the upper part of the bosses 26, which can realize the axial fixation of the yarn drum 17; the first cross beam 8, the vertical beam 9, and the second cross beam 10 are all provided with threading holes for passing the yarn; during use, the yarn of the yarn drum 17 can pass through the threading holes. A yarn tensioner 24 is provided near the sewing assembly to realize the tensioning of the yarn.

[0062] The handheld sewing device further comprises a first protective cover 1 sleeved on the outer periphery of the first horizontal beam 8 and a second protective cover 7 sleeved on the outer periphery of the second horizontal beam 10; a vertical protective cover 25 is arranged on the outer side of the vertical beam 9 to effectively protect the yarn and the internal structure.

[0063] The first cross beam 8, the vertical beam 9, and the second cross beam 10 are plug-connected in sequence; the plug-connection arrangement can effectively improve assembly efficiency.

[0064] A first guide plate and a second guide plate that are raised upward are provided on both sides of the bottom surface of the pressing plate 6 for contacting the material to be sewn. The first guide plate and the second guide plate are respectively arranged on both sides of the bottom of the pressing plate 6. In actual use, the setting of the first guide plate and the second guide plate can guide the material placed under the pressing plate 6 for easy placement.

[0065] In a specific embodiment, in order to adapt to the sewing of fiber fabrics of different widths, the first crossbeam 8 and the second crossbeam 10 can be effectively extended. Specifically, the first crossbeam 8 includes a first main rod 28 and a first extension rod 29, one end of the first extension rod 29 is detachably connected to the vertical beam 9, one end of the first main rod 28 is provided with a sewing assembly and a pressing assembly, and the other end of the first main rod 28 is detachably connected to the first extension rod 29 or the vertical beam 9; the second crossbeam 10 includes a second main rod and a second extension rod 33, one end of the second extension rod 33 is detachably connected to the vertical beam 9, and one end of the second main rod is detachably connected to the second extension rod 33 or the vertical beam 9.

[0066] like Figure 5 As shown, one end of the first main rod 28 for connecting with the first extension rod 29 is provided with a socket. Figure 6 As shown, one end of the first extension rod 29 for connecting with the first main rod 28 is provided with a protruding plug-in protrusion. The plug-in connection setting mode enables the handheld sewing device to realize rapid change of the length of the beam, which is conducive to improving work efficiency.

[0067] like Figure 3 As shown, an upper extension beam cover 30 may be provided to cover the outer periphery of the first extension rod 29 , and a lower extension beam cover 31 may be provided to cover the outer periphery of the second extension rod 33 .

[0068] like Figure 7 As shown, the vertical beam 9 is provided with plug-in protrusions for plugging in and mating with the first cross beam 8 and the second cross beam 10, thereby simplifying the assembly process.

[0069] On the basis of the above embodiments, the first transverse transmission shaft 22 can include a first main transmission shaft, a first extended transmission shaft, and a second main transmission shaft, one end of the first main transmission shaft is provided with a cam 23, and the other end is detachably connected to the first extended transmission shaft, the other end of the first extended transmission shaft is detachably connected to the second main transmission shaft, and the other end of the second main transmission shaft is provided with a sixth bevel gear 21; the second transverse transmission shaft 15 includes a third main transmission shaft, a second extended transmission shaft, and a fourth main transmission shaft, one end of the third main transmission shaft is provided with a ratchet, and the other end is detachably connected to the second extended transmission shaft, the other end of the second extended transmission shaft is detachably connected to the fourth main transmission shaft, and the other end of the fourth main transmission shaft is provided with a seventh bevel gear.

[0070] In actual use, only the first main body transmission shaft and the second main body transmission shaft can be used, and the third main body transmission shaft and the fourth main body transmission shaft can also use the first main body transmission shaft, the first extended transmission shaft, the second main body transmission shaft, the third main body transmission shaft, the second extended transmission shaft, and the fourth main body transmission shaft at the same time; the specific details are determined according to actual conditions and will not be elaborated here.

[0071] Specifically, the first main rod 28 and the first extension rod 29, the second main rod and the second extension rod 33, the first main transmission shaft and the first extension transmission shaft, the first extension transmission shaft and the second main transmission shaft, the third main transmission shaft and the second extension transmission shaft, and the second extension transmission shaft and the fourth main transmission shaft can be plug-connected. Of course, other connection methods that meet the requirements can also be used, which are determined according to actual conditions and will not be elaborated here.

[0072] like Figure 4 As shown, the first transverse transmission shaft 22 can include a first transmission shaft body 36 and a first transmission extension shaft 34, and the first transmission shaft body 36 and the first transmission extension shaft 34 are connected via a coupling 32; the second transverse transmission shaft 15 can include a second transmission shaft body 37 and a second transmission extension shaft 35, and the second transmission shaft body 37 and the second transmission extension shaft 35 are connected via a coupling 32.

[0073] In this specific embodiment, by providing the first transmission extension shaft 34 and the second transmission extension shaft 35 , the sewing operation of materials of different widths can be effectively adapted.

[0074] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referenced to each other. Any combination of all embodiments provided by the utility model is within the protection scope of this utility model and will not be described in detail here.

[0075] The handheld sewing device provided by the utility model is introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A handheld sewing device, characterized in that: include: Main structure; A sewing assembly, which is liftably arranged on the main structure, and the sewing assembly is provided with a sewing needle (5); The material pressing assembly is provided with a pressing plate (6) for pressing the material to be sewn, the pressing plate (6) is installed on the main structure, and the installation position of the pressing plate (6) in the vertical direction of the main structure is adjustable.

2. The handheld sewing device according to claim 1, characterized in that: The pressing component also includes: An adjusting nut (3), wherein the main structure is provided with an externally threaded boss, and the adjusting nut (3) is threadably matched with the externally threaded boss; An elastic member (2), one end of which abuts against the main structure and the other end of which abuts against the upper surface of the pressing plate (6), and is used to elastically press the pressing plate (6) against the adjusting nut (3); By screwing the adjusting nut (3), the size of the gap between the bottom surface of the pressing plate (6) and the main structure for placing the material to be sewn can be adjusted.

3. The handheld sewing device according to claim 2, characterized in that: The external thread boss is a hollow structure, and the sewing component is arranged through the external thread boss.

4. The handheld sewing device according to claim 1, characterized in that: The main structure comprises a first cross beam (8), a vertical beam (9) and a second cross beam (10); the first cross beam (8), the vertical beam (9) and the second cross beam (10) are sequentially connected to form a U-shaped structure; the first cross beam (8) is provided with the pressing assembly and the sewing assembly; the second cross beam (10) is provided with a thread hooking assembly (14) for cooperating with the sewing assembly.

5. The handheld sewing device according to claim 4, characterized in that: Also included is a transmission assembly, the transmission assembly comprising: A rocker (18), wherein a first bevel gear is disposed at an end of the rocker (18), and the length direction of the rocker (18) extends in a direction perpendicular to the vertical beam (9); A first vertical transmission shaft (20) is arranged along the extension direction of the vertical beam (9), one end of the first vertical transmission shaft (20) is provided with a second bevel gear for meshing and transmitting with the first bevel gear, and the other end is provided with a third bevel gear; A second vertical transmission shaft (27) is arranged along the extension direction of the vertical beam (9), one end of the second vertical transmission shaft (27) is provided with a fourth bevel gear for meshing and transmitting with the first bevel gear, and the other end of the second vertical transmission shaft (27) is provided with a fifth bevel gear; a first transverse transmission shaft (22) disposed on the first transverse beam (8) along the extension direction of the first transverse beam (8); a sixth bevel gear (21) for meshing and transmitting with the third bevel gear is disposed at one end of the first transverse transmission shaft (22); and a cam (23) is disposed at the other end; the sewing assembly is provided with an extension piece (11) for contacting the upper side of the outer edge of the cam (23) to drive the sewing assembly to rise and fall; A second transverse transmission shaft (15) is arranged on the second transverse beam (10) along the extension direction of the second transverse beam (10); one end of the second transverse transmission shaft (15) is provided with a seventh bevel gear for meshing and transmitting with the fifth bevel gear, and the other end is provided with a ratchet; the ratchet is used to cooperate with the wire hooking assembly (14).

6. The handheld sewing device according to claim 5, characterized in that: The vertical beam (9) is provided with a mounting seat (16) for mounting a yarn bobbin (17); the mounting seat (16) is provided with at least two protruding columns (26); and the yarn bobbin (17) is rotatably mounted on the protruding columns (26).

7. The handheld sewing device according to claim 5, characterized in that: The first cross beam (8), the vertical beam (9) and the second cross beam (10) are all provided with threading holes for passing yarns; The handheld sewing device further comprises a first protective cover (1) sleeved on the outer periphery of the first crossbeam (8) and a second protective cover (7) sleeved on the outer periphery of the second crossbeam (10); The first cross beam (8), the vertical beam (9), and the second cross beam (10) are plug-connected in sequence; A first guide plate and a second guide plate that are tilted upward are arranged on both sides of the bottom surface of the pressing plate (6) for contacting the material to be sewn, and the first guide plate and the second guide plate are arranged on both sides of the bottom of the pressing plate (6).

8. The handheld sewing device according to any one of claims 5 to 7, characterized in that: The first cross beam (8) comprises a first main rod (28) and a first extension rod (29), one end of the first extension rod (29) is detachably connected to the vertical beam (9), one end of the first main rod (28) is provided with the sewing assembly and the pressing assembly, and the other end of the first main rod (28) is detachably connected to the first extension rod (29) or the vertical beam (9); The second cross beam (10) comprises a second main rod and a second extension rod (33), one end of the second extension rod (33) being detachably connected to the vertical beam (9), and one end of the second main rod being detachably connected to the second extension rod (33) or the vertical beam (9).

9. The handheld sewing device according to claim 8, characterized in that: The first transverse transmission shaft (22) comprises a first main transmission shaft, a first extended transmission shaft, and a second main transmission shaft, one end of the first main transmission shaft is provided with the cam (23), and the other end is detachably connected to the first extended transmission shaft, the other end of the first extended transmission shaft is detachably connected to the second main transmission shaft, and the other end of the second main transmission shaft is provided with the sixth bevel gear (21); The second transverse transmission shaft (15) comprises a third main transmission shaft, a second extended transmission shaft, and a fourth main transmission shaft, one end of the third main transmission shaft is provided with the ratchet, and the other end is detachably connected to the second extended transmission shaft, the other end of the second extended transmission shaft is detachably connected to the fourth main transmission shaft, and the other end of the fourth main transmission shaft is provided with the seventh bevel gear.

10. The handheld sewing device according to claim 9, characterized in that: The first main rod (28) and the first extension rod (29), the second main rod and the second extension rod (33), the first main transmission shaft and the first extension transmission shaft, the first extension transmission shaft and the second main transmission shaft, the third main transmission shaft and the second extension transmission shaft, and the second extension transmission shaft and the fourth main transmission shaft are all plug-connected.

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