Household sewing machine

Abstract

The invention relates to the field of household sewing, in particular to a household sewing machine which comprises a sewing table, a shell is mounted above the sewing table, a crank connecting rod structure of the sewing machine is mounted in the shell, one side of the shell is connected with a control knob, and the control knob is linearly connected with an electric control driving unit in the shell. According to the sewing machine, by adjusting the positions of thread balls of different colors, under the condition that normal work of equipment is not affected, sewing thread colors can be replaced without the needle threading process, the color of a shuttle below the sewing machine can be adjusted, and the sewing machine is convenient to use and high in practicability. The color of the sewing thread can be automatically matched according to the color of the sewing thread of the thread ball and the shuttle hook, so that the diversity of the color of the sewing thread is enriched, the color of the sewing thread can be quickly changed without influencing the sewing work through the structure, and the sewing efficiency of equipment is improved.

Description

Technical Field

[0001] The present invention relates to the field of household sewing, and particularly to a household sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so as to interweave or sew together one or more layers of sewing materials. Generally, it is divided into two types: household sewing machines and industrial sewing machines.

[0003] Currently, household sewing machines on the market are generally driven by electricity and manually. By starting the electronic control drive unit to drive the crank - connecting rod structure, the internal crank - connecting rod structure drives the sewing needle to make reciprocating movements through the rotation of the main shaft, passes the sewing thread through the fabric to be sewn, and at the same time, the main shaft drives the lower shaft below to rotate, thereby driving the oscillating shaft to rotate, so that the bobbin rotates to hook the sewing thread. By repeating this kind of work, the fabric is sewn. The manual sewing machine only uses manual drive for the crank - connecting rod structure. However, this traditional sewing method still has the following defects:

[0004] During the sewing process, in order to make the color of the sewing thread on the sewn fabric look good, sometimes it is necessary to select the same color of the sewing thread according to the color of the fabric, and sometimes a sewing thread color that contrasts with the fabric color is selected to achieve the aesthetic appearance after sewing the fabric. However, different from industrial sewing machines, a household sewing machine has only one set of sewing needles. When it is necessary to change the color of the sewing thread for aesthetic reasons, operations such as threading the sewing needle again are required. This operation is time - consuming and laborious. Moreover, with the development of society and the improvement of people's aesthetics, sometimes there may be multiple different colors of sewing threads on a piece of fabric. At this time, when the household sewing machine sews this kind of fabric with such requirements, a large amount of time is required for the process of changing the sewing thread, which reduces the sewing efficiency of the household sewing machine.

[0005] Therefore, it is very necessary to invent a household sewing machine to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a household sewing machine, which can quickly adjust the position of the thread bobbin to achieve the effect of quickly adjusting the color of the sewing thread, so as to solve the problem that when changing the color of the sewing thread in the prior art, complex processes such as threading the needle are required, reducing the sewing efficiency.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A household sewing machine, comprising: a sewing table, above which a housing is installed. Inside the housing, a crank - connecting rod structure of the sewing machine is installed. One side of the housing is connected with a control knob, and the control knob is linearly connected with the electronic control drive unit inside the housing. The electronic control drive unit controls the operation of the crank - connecting rod structure;

[0008] A connecting column is connected below the housing, a presser foot is connected below the connecting column, and a first output shaft is connected below the crank and connecting rod assembly in the housing.

[0009] As a preferred embodiment of the present invention, a fixing column is installed above the sewing table, a first spring is sleeved on the fixing column, a sleeve is attached and connected above the first spring, the sleeve is sleeved with the fixing column, a limiting block is fixedly connected to the inner wall of the sleeve, a limiting groove is opened on one side of the fixing column, and the limiting block is slidably connected in the limiting groove.

[0010] As a preferred embodiment of the present invention, a through hole is opened above the sleeve, a fixing block is fixedly connected to the inner wall of the through hole, a connecting rod is rotatably connected above the fixing column, the connecting rod penetrates through the through hole, a first annular groove is opened on one side of the connecting rod, a fixing groove is opened above the inner wall of the first annular groove, several groups of the fixing grooves are opened above the inner wall of the first annular groove, and the fixing groove is slidably clamped with the fixing column.

[0011] As a preferred embodiment of the present invention, a rotating cylinder is fixedly connected above the connecting rod, a fixing shaft is fixedly connected to the inner wall of the rotating cylinder, a thread bobbin is sleeved on the fixing shaft, the number of the thread bobbins arranged in the rotating cylinder is equal to the number of the fixing grooves opened above the inner wall of the first annular groove, a rotating seat is fixedly connected above the rotating cylinder, a curved rod is rotatably connected in the rotating seat, a notch groove is opened on one side of the curved rod, and an extension line of the thread bobbin penetrates through the notch groove.

[0012] As a preferred embodiment of the present invention, a through chute is opened on the side of the curved rod away from the notch groove, a through shaft penetrates through the through chute, a driving rod is rotatably connected to the through shaft, a push rod is rotatably connected to the side of the driving rod away from the connection with the through shaft, the upper part of the push rod is attached and connected to the first output shaft, a guiding ring is fixedly connected above the rotating cylinder, and an extension line of the thread bobbin penetrates through the guiding ring.

[0013] As a preferred embodiment of the present invention, a through hole is opened above the rotating cylinder, the push rod penetrates through the through hole, an annular clamping groove is opened on the inner wall of the through hole, a pressing block is clamped and connected in the annular clamping groove, the pressing block is fixedly connected to the push rod, a second spring is attached and connected below the pressing block, the second spring is attached and connected to the lower part of the annular clamping groove, the second spring is sleeved with the push rod, a sewing needle is installed below the push rod, and an extension line of the thread bobbin penetrates through the sewing needle.

[0014] As a preferred embodiment of the present invention, a cavity is provided inside the sewing table. Above the inner wall of the cavity, a sewing needle hole is provided, and the position of the sewing needle hole coincides with that of the sewing needle. On the inner wall of the cavity, a second output shaft is rotatably connected, and the second output shaft is connected to the crank - connecting rod assembly inside the housing. On one side of the second output shaft, an arc - shaped plate is fixedly connected.

[0015] As a preferred embodiment of the present invention, a connecting cylinder is fixedly connected to the inner wall of the cavity. A rotating rod penetrates through the connecting cylinder. On the inner wall of the connecting cylinder, a first annular groove and a fixing groove identical to the connecting rod are provided. A fixing block is slidably engaged in the fixing groove, and the fixing block is fixedly connected to the rotating rod. On one side of the rotating rod, a turntable is fixedly connected. A connecting groove is provided inside the turntable. The number of connecting grooves provided on one side of the turntable is equal to the number of fixing grooves provided inside the connecting cylinder. An annular groove two is provided inside the connecting groove. A positioning block is slidably connected inside the annular groove two. On one side of the positioning block, a rotating block is fixedly connected. The rotating block penetrates through the connecting groove. An arc - shaped groove is provided on one side of the rotating block, and the arc - shaped groove is sleeved with the arc - shaped plate.

[0016] As a preferred embodiment of the present invention, a bobbin is fixedly connected to the rotating block on the side far from the arc - shaped groove. A handle is fixedly connected to the turntable on the side far from the rotating rod. A limiting ring is fixedly connected to the handle. A third spring is attached to one side of the limiting ring in a fitting manner, and the third spring is sleeved with the handle. A fixing plate is fixedly connected to the inner wall of the cavity. The fixing plate penetrates through the handle. The third spring is attached to the fixing plate in a fitting manner. A thread - changing groove is provided on one side of the fixing plate, and the number of thread - changing grooves provided is equal to the number of bobbins installed.

[0017] In the above - mentioned technical solution, compared with the prior art, the technical effects and advantages provided by the present invention are as follows:

[0018] By adjusting the positions of different - colored thread balls, without affecting the normal operation of the equipment, the replacement of the sewing thread color can be completed without the process of threading the needle, and the color of the lower bobbin can be adjusted, so as to meet the needs of self - sewing. According to the sewing thread colors of the thread ball and the bobbin, the sewing thread colors can be self - matched, thus enriching the diversity of sewing thread colors. With this kind of structure, the color of the sewing thread can be quickly changed without affecting the sewing work, improving the sewing efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is the overall structural schematic diagram of the present invention;

[0021] Figure 2 is the sectional structural schematic diagram of the sewing table of the present invention;

[0022] Figure 3 is the top view structural schematic diagram of the rotating cylinder of the present invention;

[0023] Figure 4 is the structural schematic diagram of the arc groove and arc plate of the present invention;

[0024] Figure 5 is the structural schematic diagram of the connecting rod of the present invention;

[0025] Figure 6 of the present invention Figure 1 is the enlarged structural schematic diagram at position A in;

[0026] Figure 7 of the present invention Figure 1 is the enlarged structural schematic diagram at position B in;

[0027] Figure 8 of the present invention Figure 2 is the enlarged structural schematic diagram at position C in.

[0028] Explanation of reference numerals:

[0029] 1, sewing table; 2, outer shell; 3, control knob; 4, connecting column; 5, presser foot; 6, output shaft I; 7, fixed column; 8, spring I; 9, sleeve; 10, limit block; 11, limit groove; 12, through hole; 13, fixed block; 14, connecting rod; 15, annular groove I; 16, fixed groove; 17, rotating cylinder; 18, fixed shaft; 19, thread bobbin; 20, rotating seat; 21, curved rod; 22, notch groove; 23, through chute; 24, through shaft; 25, driving rod; 26, guide ring; 27, push rod; 28, through hole; 29, annular clamping groove; 30, extrusion block; 31, spring II; 32, sewing needle; 33, cavity; 34, sewing needle hole; 35, output shaft II; 36, arc plate; 37, connecting cylinder; 38, rotating rod; 39, spring III; 40, turntable; 41, connecting groove; 42, annular groove II; 43, positioning block; 44, rotating block; 45, arc groove; 46, bobbin shuttle; 47, handle; 48, fixing plate; 49, thread changing groove; 50, limit ring. Detailed implementation manners

[0030] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings.

[0031] The present invention provides as Figure 1-8A household sewing machine shown in the figure includes: a sewing table 1, above which a housing 2 is installed. Inside the housing 2, a crank - connecting rod structure of the sewing machine is installed. On one side of the housing 2, a control knob 3 is connected. The control knob 3 is linearly connected to an electric control driving unit inside the housing 2, and the electric control driving unit controls the operation of the crank - connecting rod structure.

[0032] Below the housing 2, a connecting column 4 is connected. Below the connecting column 4, a presser foot 5 is connected. Below the crank - connecting rod assembly inside the housing 2, an output shaft 1 6 is connected.

[0033] In the above - mentioned structure, the crank - connecting rod structure includes: a main shaft. One end of the main shaft is connected to a crank. One side of the crank is connected to a connecting rod. The connecting rod is connected to the output shaft 1 6 above the sewing needle. When the main shaft rotates, through the crank and the connecting rod, the rotational force of the main shaft is converted into a reciprocating force of the output shaft 1 6. And on the other end of the main shaft, there is also the same crank - connecting rod structure. Below its connecting rod, a lower - shaft crank is connected. And on one side of the lower - shaft crank, a swing shaft is rotatably connected. When the main shaft rotates, it will drive the lower - shaft crank to rotate, causing the swing shaft to rotate simultaneously, thereby driving the output shaft 2 35 to rotate, and the output shaft 2 35 drives the bobbin shuttle 46 to rotate. And the electric control driving unit includes: a motor, a power supply, and a controller. The controller is linearly connected to the control knob 3. The controller is linearly connected to the power supply. The power supply is linearly connected to the motor. The output end of the motor is connected to the main shaft.

[0034] As Figure 1 、 Figure 2 and Figure 7 shown in the figure, above the sewing table 1, a fixed column 7 is installed. A first spring 8 is sleeved on the fixed column 7. Above the first spring 8, a sleeve 9 is attached. The sleeve 9 is sleeved on the fixed column 7. Inside the inner wall of the sleeve 9, a limiting block 10 is fixedly connected. On one side of the fixed column 7, a limiting groove 11 is opened. The limiting block 10 is slidably connected in the limiting groove 11.

[0035] In the above - mentioned structure, through the sliding connection of the limiting groove 11 and the limiting block 10, the sleeve 9 can slide up and down along the fixed column 7 and compress the first spring 8.

[0036] As Figure 5 and Figure 7 shown in the figure, a through - hole 12 is opened above the sleeve 9. Inside the inner wall of the through - hole 12, a fixed block 13 is fixedly connected. Above the fixed column 7, a connecting rod 14 is rotatably connected. The connecting rod 14 is connected through the through - hole 12. On one side of the connecting rod 14, a first annular groove 15 is opened. Above the inner wall of the first annular groove 15, a fixing groove 16 is opened. Several groups of fixing grooves 16 are opened above the inner wall of the first annular groove 15. The fixing groove 16 is slidably clamped with the fixed column 7.

[0037] In the above structure, when the sleeve 9 moves up and down, it can drive the fixed block 13 to slide out along the fixed groove 16 and move to a position flush with the first annular groove 15, so that the connecting rod 14 can rotate freely above the fixed column 7.

[0038] As Figure 3 , Figure 6 and Figure 7 shown, a rotating cylinder 17 is fixedly connected above the connecting rod 14. A fixed shaft 18 is fixedly connected to the inner wall of the rotating cylinder 17. A thread bobbin 19 is sleeved on the fixed shaft 18. The number of the thread bobbins 19 arranged in the rotating cylinder 17 is equal to the number of the fixed grooves 16 opened above the inner wall of the first annular groove 15. A rotating seat 20 is fixedly connected above the rotating cylinder 17. A curved rod 21 is rotatably connected in the rotating seat 20. A notch groove 22 is formed on one side of the curved rod 21. An extension line of the thread bobbin 19 penetrates through the notch groove 22.

[0039] In the above structure, the number of the fixed grooves 16 is the same as that of the thread bobbins 19 and they are on the same horizontal plane. During the fixing process of the fixed groove 16, it can ensure that the suture needle 32 on one side of the thread bobbin 19 can correspond above the suture needle hole 34, prevent the positions of the suture needle hole 34 and the suture needle 32 from deviating, and the colors of the sewing threads wound by several groups of the thread bobbins 19 are different.

[0040] As Figure 3 and Figure 6 shown, a through chute 23 is formed on the side of the curved rod 21 away from the notch groove 22. A through shaft 24 penetrates through the through chute 23. A driving rod 25 is rotatably connected to the through shaft 24. The driving rod 25 is rotatably connected to a push rod 27 on the side away from the connection with the through shaft 24. The upper part of the push rod 27 is in fit connection with the first output shaft 6. A guide ring 26 is fixedly connected above the rotating cylinder 17. An extension line of the thread bobbin 19 penetrates through the guide ring 26.

[0041] In the above structure, through the notch groove 22 and the guide ring 26, the situation that the sewing thread of the thread bobbin 19 is wound during the process of lifting and guiding the thread is prevented.

[0042] As Figure 3 and Figure 6 shown, a through hole 28 is formed above the rotating cylinder 17. The through hole 28 is in through connection with the push rod 27. An annular clamping groove 29 is formed on the inner wall of the through hole 28. An extrusion block 30 is clamped in the annular clamping groove 29. The extrusion block 30 is fixedly connected with the push rod 27. A second spring 31 is in fit connection below the extrusion block 30. The second spring 31 is in fit connection with the lower part of the annular clamping groove 29. The second spring 31 is sleeved on the push rod 27. A suture needle 32 is installed below the push rod 27. An extension line of the thread bobbin 19 penetrates through the suture needle 32.

[0043] In the above structure, when the output shaft 1-6 pushes the push rod 27, it will drive the extrusion block 30 to extrude the second spring 31. Since the output shaft 1-6 is a reciprocating motion, at this time, the push rod 27 can be reset by the second spring 31, so that the push rod 27 can always be in a fitting state with the output shaft 1-6.

[0044] As Figure 2 , Figure 4 and Figure 8 shown, a cavity 33 is provided in the sewing table 1. A sewing needle hole 34 is provided above the inner wall of the cavity 33. The position of the sewing needle hole 34 coincides with that of the sewing needle 32. An output shaft 2-35 is rotatably connected to the inner wall of the cavity 33. The output shaft 2-35 is connected to the crank and connecting rod assembly in the housing 2. An arc plate 36 is fixedly connected to one side of the output shaft 2-35.

[0045] In the above structure, when the sewing needle hole 34 passes through the fabric, the sewing thread can be brought to the side of the bobbin 46 inside the cavity 33 through the sewing needle hole 34 to hook the sewing thread.

[0046] As Figure 4 and Figure 8 shown, a connecting cylinder 37 is fixedly connected to the inner wall of the cavity 33. A rotating rod 38 is connected through the connecting cylinder 37. An annular groove 1-15 and a fixing groove 16 identical to those of the connecting rod 14 are provided on the inner wall of the connecting cylinder 37. A fixing block 13 is slidably engaged in the fixing groove 16, and the fixing block 13 is fixedly connected to the rotating rod 38. A turntable 40 is fixedly connected to one side of the rotating rod 38. A connecting groove 41 is provided in the turntable 40. The number of the connecting grooves 41 provided on one side of the turntable 40 is equal to the number of the fixing grooves 16 provided inside the connecting cylinder 37. An annular groove 2-42 is provided in the connecting groove 41. A positioning block 43 is slidably connected in the annular groove 2-42. A rotating block 44 is fixedly connected to one side of the positioning block 43. The rotating block 44 is connected through the connecting groove 41. An arc groove 45 is provided on one side of the rotating block 44. The arc groove 45 is sleeved with the arc plate 36.

[0047] In the above structure, by moving the rotating rod 38 in the connecting cylinder 37, the fixing block 13 on the rotating rod 38 is disengaged from the fixing groove 16 in the connecting cylinder 37 and moved to a position flush with the annular groove 1-15 in the connecting cylinder 37, so that the whole turntable 40 can rotate. The number of the fixing grooves 16 provided inside the connecting cylinder 37 is equal to the number of the connecting grooves 41 and they are at the same horizontal position, so that when the connecting groove 41 rotates and changes its position, the arc groove 45 on one side of other rotating blocks 44 can be positioned on one side of the arc plate 36.

[0048] As Figure 4 and Figure 8As shown, a shuttle 46 is fixedly connected to the rotating block 44 on the side away from the arc-shaped groove 45, and a handle 47 is fixedly connected to the turntable 40 on the side away from the rotating rod 38. A limiting ring 50 is fixedly connected to the handle 47. A third spring 39 is attached to one side of the limiting ring 50. The third spring 39 is sleeved on the handle 47. A fixing plate 48 is fixedly connected to the inner wall of the cavity 33. The fixing plate 48 is penetrated by the handle 47. The third spring 39 is attached to the fixing plate 48. A thread-changing groove 49 is formed on one side of the fixing plate 48. The number of the formed thread-changing grooves 49 is equal to the number of the installed shuttles 46.

[0049] In the above structure, by pulling the handle 47, the handle 47 drives the limiting ring 50 to squeeze the third spring 39, so that the turntable 40 moves to adjust the position of the shuttle 46 in the turntable 40, and the sewing thread colors in several groups of the shuttles 46 are all different colors.

[0050] The specific implementation manner of the present invention, such as Figure 1-8As shown: the output shaft 6 reciprocates to push the push rod 27 below to move, and the push rod 27 drives the driving rod 25 to slide downward, and at the same time drives the through shaft 24 to slide in the through slot 23, so that the curved rod 21 is tilted upward in the rotating seat 20, so that the notch groove 22 pulls the suture thread from the thread ball 19, thereby completing the thread feeding work, and the push rod 27 slides downward along the through hole 28 and drives the extrusion block 30 to squeeze the spring 21 along the annular groove 29, so that the push rod 27 pushes the sewing needle 32 to pass through the cloth to pass the suture thread and bring it into the sewing needle hole 34. When resetting, the push rod 27 is reset by the spring 2 31 and drives the curved rod 21 to reset. When the sewing needle 32 enters the sewing needle hole 34, the output shaft 2 35 drives the shuttle 46 to rotate to hook the upper suture and articulate with the suture in the shuttle 46 to complete the sewing work. When the color of the suture needs to be changed, the sleeve 9 is pulled to drive the limit block 10 to slide along the limit groove 11, so that the sleeve 9 squeezes the spring 1 8 along the fixed column 7, so that the fixed block 13 slides out of the fixed groove 16 and moves to a position flush with the annular groove 15. At this time, the upper rotating drum 17 can rotate When the rotating drum 17 changes the position of the push rod 27, the new push rod 27 is moved to the bottom of the output shaft 6. At this time, the sleeve 9 is loosened and reset by the spring 8, so that the fixing block 13 is engaged in the new fixing groove 16. If the position of the push rod 27 is not aligned with the output shaft 6, the fixing block 13 cannot be engaged in the new fixing groove 16 to prevent it from being adjusted out of place. Since the colors of the multiple groups of wire balls 19 arranged above can be adjusted and replaced according to actual needs, and the limit ring 50 is driven by pulling the handle 47 to squeeze the spring three 39, the rotating rod 38 drives the upper The fixed block 13 of the square is disengaged from the fixed groove 16 in the connecting tube 37 and moved to a position flush with the annular groove 15 in the connecting tube 37. At the same time, the arc groove 45 is disengaged from the top of the arc plate 36. At this time, the handle 47 is turned, and the handle 47 drives the turntable 40 to rotate, so that the turntable 40 drives the shuttle 46 to change its position, and the other shuttle 46 is rotated to the side of the output shaft 2 35. By loosening the handle 47, the turntable 40 can be reset through the spring 39, and the new arc groove 45 is stuck on the arc plate 36 to ensure their docking, thereby completing the adjustment of the stitching color of the shuttle 46.

[0051] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A household sewing machine comprising: A sewing table (1), characterized in that: a shell (2) is installed above the sewing table (1), a crank connecting rod structure of a sewing machine is installed in the shell (2), a control knob (3) is connected to one side of the shell (2), the control knob (3) is linearly connected to an electric control drive unit in the shell (2), and the electric control drive unit controls the operation of the crank connecting rod structure; A connecting column (4) is connected below the shell (2), a presser foot (5) is connected below the connecting column (4), and an output shaft 1 (6) is connected below the crank-connecting rod assembly in the shell (2).

2. A household sewing machine according to claim 1, characterized in that: A fixed column (7) is installed above the sewing table (1), a spring (8) is sleeved on the fixed column (7), a sleeve (9) is fitted and connected above the spring (8), the sleeve (9) is sleeved on the fixed column (7), a limiting block (10) is fixedly connected on the inner wall of the sleeve (9), a limiting groove (11) is provided on one side of the fixed column (7), and the limiting block (10) is slidably connected in the limiting groove (11).

3. A household sewing machine according to claim 2, characterized in that: A through hole (12) is provided above the sleeve (9), a fixed block (13) is fixedly connected to the inner wall of the through hole (12), a connecting rod (14) is rotatably connected to the upper part of the fixing column (7), the connecting rod (14) is connected through the through hole (12), an annular groove (15) is provided on one side of the connecting rod (14), a fixing groove (16) is provided above the inner wall of the annular groove (15), a plurality of groups of fixing grooves (16) are provided above the inner wall of the annular groove (15), and the fixing grooves (16) are slidably engaged with the fixing column (7).

4. A household sewing machine according to claim 3, characterized in that: A rotating drum (17) is fixedly connected above the connecting rod (14), a fixed shaft (18) is fixedly connected on the inner wall of the rotating drum (17), a thread ball (19) is sleeved on the fixed shaft (18), the number of the thread balls (19) arranged in the rotating drum (17) is equal to the number of the fixed grooves (16) opened above the inner wall of the annular groove (15), a rotating seat (20) is fixedly connected above the rotating drum (17), a curved rod (21) is rotatably connected in the rotating seat (20), a notch groove (22) is opened on one side of the curved rod (21), and an extension line connected to the thread ball (19) passes through the notch groove (22).

5. A household sewing machine according to claim 4, characterized in that: The curved rod (21) is provided with a through slide groove (23) on a side away from the notch groove (22), a through shaft (24) is connected through the through slide groove (23), a driving rod (25) is rotatably connected to the through shaft (24), the driving rod (25) is rotatably connected to a push rod (27) on a side away from the through shaft (24), the push rod (27) is closely connected to the output shaft (6) at the top, a guide ring (26) is fixedly connected to the top of the rotating drum (17), and an extension line of the wire ball (19) is connected through the guide ring (26).

6. A household sewing machine according to claim 5, characterized in that: A through hole (28) is provided on the top of the rotating drum (17), and the through hole (28) is connected to the push rod (27). An annular groove (29) is provided on the inner wall of the through hole (28), and an extrusion block (30) is engaged and connected in the annular groove (29). The extrusion block (30) is fixedly connected to the push rod (27), and a second spring (31) is closely connected to the bottom of the extrusion block (30). The second spring (31) is closely connected to the bottom of the annular groove (29), and the second spring (31) is sleeved with the push rod (27). A sewing needle (32) is installed below the push rod (27), and an extension line of the thread ball (19) is connected to the inside of the sewing needle (32).

7. A household sewing machine according to claim 1, characterized in that: A cavity (33) is provided in the sewing table (1), a sewing needle hole (34) is provided on the upper inner wall of the cavity (33), the position of the sewing needle hole (34) coincides with the position of the sewing needle (32), an output shaft (35) is rotatably connected to the inner wall of the cavity (33), the output shaft (35) is connected to the crank connecting rod assembly in the housing (2), and an arc plate (36) is fixedly connected to one side of the output shaft (35).

8. A household sewing machine according to claim 7, characterized in that: A connecting tube (37) is fixedly connected to the inner wall of the cavity (33), a rotating rod (38) is connected through the connecting tube (37), an annular groove (15) and a fixing groove (16) identical to the connecting rod (14) are provided on the inner wall of the connecting tube (37), a fixing block (13) is slidably engaged in the fixing groove (16), and the fixing block (13) is fixedly connected to the rotating rod (38), a rotating disk (40) is fixedly connected to one side of the rotating rod (38), a connecting groove (41) is provided in the rotating disk (40), and the connecting tube (37) is provided with a connecting groove (41). The number of the connecting grooves (41) provided on one side of the rotating disk (40) is equal to the number of the fixing grooves (16) provided inside the connecting tube (37); a second annular groove (42) is provided inside the connecting groove (41); a positioning block (43) is slidably connected inside the second annular groove (42); a rotating block (44) is fixedly connected to one side of the positioning block (43); the rotating block (44) penetrates and is connected to the connecting groove (41); an arc groove (45) is provided on one side of the rotating block (44); the arc groove (45) is sleeved with the arc plate (36).

9. A household sewing machine according to claim 8, characterized in that: The rotating block (44) is fixedly connected with a shuttle (46) on the side away from the arc groove (45), and the rotating disk (40) is fixedly connected with a handle (47) on the side away from the rotating rod (38). A limit ring (50) is fixedly connected to the handle (47), and a spring three (39) is closely connected to one side of the limit ring (50). The spring three (39) is sleeved with the handle (47). A fixed plate (48) is fixedly connected to the inner wall of the cavity (33). The fixed plate (48) is connected with the handle (47) through, and the spring three (39) is closely connected with the fixed plate (48). A line changing groove (49) is opened on one side of the fixed plate (48), and the number of the line changing grooves (49) is equal to the number of installed shuttles (46).

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