Sewing machine with presser foot lifting driven by single motor and differential amount adjustment

Abstract

The utility model belongs to the technical field of sewing equipment, and particularly relates to a sewing machine capable of driving a presser foot to lift through a single motor and achieving differential adjustment. The upper differential feeding mechanism comprises an upper feeding tooth and an upper swing seat, and further comprises a motor and a presser foot lifting top plate, a rotating shaft of the motor is provided with a presser foot lifting cam and an upper feeding tooth control eccentric wheel, and the presser foot lifting top plate is rotationally connected to the machine shell and comprises two first supporting feet and two second supporting feet; a roller is arranged on the first supporting leg, the second supporting leg is connected with a presser foot lifting rear lever of the presser foot lifting mechanism through a connecting piece, and the roller rolls along the cam surface of a presser foot lifting cam; the upper feeding tooth control eccentric wheel is connected with the upper swinging seat through an upper feeding control connecting rod; according to the utility model, the motor is used as a power source, presser foot lifting and differential adjustment are respectively realized, the two mechanisms do not interfere with each other during adjustment, the structure is compact, the production cost is reduced, and the efficiency and the precision are high.

Description

Technical field:

[0001] The utility model belongs to the technical field of sewing equipment, in particular to a sewing machine with a presser foot lift and differential adjustment driven by a single motor. Background technology:

[0002] The differential sewing machine is a sewing device that uses the feed dog and the upper feed dog to feed the material together. By adjusting the upper and lower feed amounts, simple local wrinkling sewing can be performed, such as sewing lace and elastic bands. Most of the differentials on the market are manually adjusted by a stitch dial or driven by a motor alone. The presser foot lifting action can be knee-controlled or motor-driven. Therefore, the existing structure has the following defects: manual adjustment of the differential amount and knee-controlled presser foot lifting have the defects of low work efficiency, and the adjustment of the presser foot lifting and differential amount driven by two motors has the defects of high cost and large space occupation. Summary of the invention:

[0003] The utility model aims to provide a sewing machine which has a compact structure and can effectively reduce production costs and is driven by a single motor to lift the presser foot and adjust the differential momentum.

[0004] The utility model is achieved in this way:

[0005] A sewing machine with presser foot lifting and differential adjustment driven by a single motor comprises an upper shaft, a presser foot, a presser foot lifting mechanism, and an upper differential feeding mechanism connected to the upper shaft, wherein the upper differential feeding mechanism comprises an upper feeding tooth and an upper swing seat, and further comprises a motor and a presser foot lifting top plate, wherein a presser foot lifting cam and an upper feeding tooth control eccentric wheel are arranged on the rotating shaft of the motor, wherein the presser foot lifting top plate is rotatably connected to a casing and comprises two first legs and a second leg, wherein a roller is arranged on the first leg, and the second leg is connected to a presser foot lifting rear lever of the presser foot lifting mechanism through a connecting piece, wherein the roller rolls along the cam surface of the presser foot lifting cam; and the upper feeding tooth control eccentric wheel is connected to the upper swing seat through an upper feeding control connecting rod.

[0006] In the above-mentioned sewing machine with presser foot lifter driven by a single motor and differential momentum adjustment, the presser foot lifter top plate is connected to the casing through a presser foot lifter top plate pin, and the presser foot lifter top plate can rotate around the axis of the presser foot lifter top plate pin.

[0007] In the above-mentioned sewing machine with presser foot lifting and differential adjustment driven by a single motor, the connecting part includes a lower joint bearing and an upper joint bearing, the lower joint bearing and the upper joint bearing are connected by a screw, the lower joint bearing includes a lower mounting hole, the upper joint bearing includes an upper mounting hole, the axes of the upper mounting hole and the lower mounting hole are not in the same plane, the lower mounting hole is connected to the second leg of the presser foot lifting top plate by a lower screw, and the upper mounting hole is connected to the presser foot lifting rear lever by an upper screw.

[0008] In the above-mentioned sewing machine with presser foot lifting and differential adjustment driven by a single motor, the cam surface of the presser foot lifting cam includes a presser foot lifting driving section and a base circle section, and the rotation angle of the motor has a presser foot lifting angle area and a differential adjustment area that are independent of each other; when the presser foot lifting motor is operating in the presser foot lifting angle area, the roller rolls on the presser foot lifting driving section of the presser foot lifting cam; when the motor is operating in the differential adjustment area, the roller rolls on the base circle section of the presser foot lifting cam.

[0009] In the above-mentioned sewing machine with presser foot lifting and differential momentum adjustment driven by a single motor, a baffle ring is provided on the upper feed tooth control eccentric wheel, one end of the upper feed control connecting rod is mounted on the upper feed tooth control eccentric wheel, and a baffle plate is provided on the outer side of the upper feed tooth control eccentric wheel. The baffle plate is fixed on the upper feed tooth control eccentric wheel to limit one end of the upper feed control connecting rod between the baffle ring and the baffle plate.

[0010] In the above-mentioned sewing machine with presser foot lifting and differential momentum adjustment driven by a single motor, the presser foot lifting mechanism includes a presser foot lifting rear lever rotating around a first fixed fulcrum, and a presser foot lifting front lever rotating around a second fixed fulcrum, the first arm of the presser foot lifting rear lever is connected to the connecting piece, the second arm is connected to one end of the presser foot lifting front lever through a presser foot lifting rod, the other end of the presser foot lifting front lever is connected to a pressure rod guide frame through a lifting plate, the pressure rod guide frame is arranged on the pressure rod, and the presser foot is arranged at the lower end of the pressure rod.

[0011] In the above-mentioned sewing machine with presser foot lifting and differential amount adjustment driven by a single motor, the upper differential feeding mechanism includes a differential swing shaft, an upper differential connecting rod and an upper feeding crank arranged parallel to the upper shaft, an upper differential eccentric wheel is arranged on the differential swing shaft, one end of the upper differential connecting rod is mounted on the upper differential eccentric wheel, and the other end is connected to the first feeding long pendulum plate and one end of the second feeding long pendulum plate through a feeding connecting rod pin, the other end of the first feeding long pendulum plate is rotatably connected to the upper swing seat, the other end of the second feeding long pendulum plate is connected to one end of the upper feeding crank through a feeding connecting rod crank pin, and the other end of the upper feeding crank is fixed on the differential swing shaft.

[0012] In the above-mentioned sewing machine driven by a single motor to lift the presser foot and adjust the differential amount, a presser foot swing fork is also provided on the differential swing shaft, a fork is provided on the presser foot swing fork, a swing slider is provided on the upper end of the presser foot swing crank, and the lower end is provided on the presser foot swing shaft, the swing slider is slid in the fork, and a sliding sleeve is also provided on the presser foot swing shaft, the sliding sleeve is mounted on the presser foot swing bushing, the presser foot swing bushing is mounted on the outside of the presser foot swing rod, an upper feed tooth slider pin is provided on the presser foot swing rod and penetrates in the radial direction, the two ends of the upper feed tooth slider pin extend out of the presser foot swing bushing and are provided with upper feed tooth sliders, and the two upper feed tooth sliders are arranged on the presser foot slider guide The presser foot slider guide is fixedly arranged at the lower end of the press rod, a presser foot lifting shaft is arranged in the press rod, a presser foot lifting pin which penetrates radially is arranged at the upper end of the presser foot lifting shaft, a presser foot lifting pin movable groove is arranged on the press rod, two ends of the presser foot lifting pin extend out of the presser foot lifting pin movable groove, a pressure regulator is arranged at the upper end of the press rod, a spring is arranged between the presser foot lifting shaft and the pressure regulator, the lower end of the presser foot swing rod is hinged with the roller guide, the roller guide includes a roller groove, an upper feed tooth roller is arranged at the end of the presser foot lifting shaft through the upper feed tooth roller pin, the upper feed tooth roller is rotatably arranged in the roller groove, and the upper feed tooth is arranged on the roller guide.

[0013] In the above-mentioned sewing machine with presser foot lifting and differential adjustment driven by a single motor, the upper feed tooth includes two feed presser foot parts arranged side by side and at intervals, and the presser foot is arranged between the two feed presser foot parts.

[0014] The outstanding advantages of the utility model compared with the prior art are:

[0015] The utility model uses a motor as a power source to respectively realize the adjustment of the presser foot lifting and the differential amount. During the adjustment, the two mechanisms do not interfere with each other, the structure is compact, the production cost is reduced, the efficiency is high and the precision is high. Description of the drawings:

[0016] Figure 1 It is one of the three-dimensional schematic diagrams of the utility model;

[0017] Figure 2 This is the second three-dimensional schematic diagram of the utility model;

[0018] Figure 3 This is the third three-dimensional schematic diagram of the utility model;

[0019] Figure 4 It is a schematic diagram of the utility model being arranged in a casing;

[0020] Figure 5 It is a schematic diagram of the upper feeding tooth of the utility model;

[0021] Figure 6 It is a schematic diagram of the presser foot lifting top plate of the utility model;

[0022] Figure 7 It is a schematic diagram of the presser foot cam of the utility model;

[0023] Figure 8 It is a schematic diagram of the upper feeding tooth control eccentric wheel of the utility model.

[0024] In the figure: 1, upper shaft; 2, presser foot; 3, upper feeding tooth; 4, upper swing seat; 5, feeding presser foot; 6, motor; 7, presser foot lifting top plate; 8, housing; 9, rotating shaft; 10, presser foot lifting cam; 11, upper feeding tooth control eccentric wheel; 12, presser foot lifting top plate pin; 13, first support foot; 14, second support foot; 15, roller; 16, presser foot lifting rear lever; 17, upper feeding control connecting rod; 18, lower joint bearing; 19, upper joint bearing; 20, retaining ring; 21, retaining plate; 22, presser foot lifting driving section; 23, base circle section; 24, presser foot lifting front lever; 25, presser foot lifting pull rod; 2 6. Lifting plate; 27. Presser bar guide; 28. Presser bar; 29. ​​Differential swing shaft; 30. Upper differential connecting rod; 31. Upper feed crank; 32. First feed long swing plate; 33. Second feed long swing plate; 34. Presser foot swing fork; 35. Presser foot swing crank; 36. Presser foot swing shaft; 37. Sliding sleeve; 38. Presser foot swing bushing; 39. Presser foot swing rod; 40. Upper feed tooth slider pin; 41. Presser foot slider guide; 42. Presser foot lifting shaft; 43. Presser foot lifting pin; 44. Pressure regulator; 45. Roller guide; 46. Upper feed tooth roller; 47. Feed swing seat fixing pin. Specific implementation method:

[0025] The present invention is further described below with reference to specific embodiments. Figure 1 —8:

[0026] The utility model provides a sewing machine with presser foot lifting and differential adjustment driven by a single motor, the sewing machine comprises an upper shaft 1, a presser foot 2, a presser foot lifting mechanism, and an upper differential feeding mechanism connected to the upper shaft 1, the upper differential feeding mechanism comprises an upper feeding tooth 3 and an upper swing seat 4, wherein the upper feeding tooth 3 comprises two feeding presser foot parts 5 arranged side by side and at intervals, and the presser foot 2 is arranged between the two feeding presser foot parts 5. The sewing machine also comprises a motor 6 and a presser foot lifting top plate 7, and the motor 6 is mounted on the right end surface of a casing 8. A presser foot lifting cam 10 and an upper feed tooth control eccentric wheel 11 are provided on the rotating shaft 9 of the motor 6. The presser foot lifting top plate 7 is rotatably connected to the casing 8 through a presser foot lifting top plate pin 12 and includes two first legs 13 and a second leg 14. A roller 15 is provided on the first leg 13, and the second leg 14 is connected to a presser foot lifting rear lever 16 of the presser foot lifting mechanism through a connecting piece. The roller 15 rolls along the cam surface of the presser foot lifting cam 10; the upper feed tooth control eccentric wheel 11 is connected to the upper swing seat 4 through an upper feed control connecting rod 17.

[0027] It should be noted that, as one of the embodiments of the connecting piece, the connecting piece includes a lower joint bearing 18 and an upper joint bearing 19, and the lower joint bearing 18 and the upper joint bearing 19 are connected by a screw, the lower joint bearing 18 includes a lower mounting hole, and the upper joint bearing 19 includes an upper mounting hole, and the axes of the upper mounting hole and the lower mounting hole are not in the same plane, and are usually perpendicular to each other. The lower mounting hole is connected to the second leg 14 of the presser foot lifting top plate 7 through a lower screw, and the upper mounting hole is connected to the presser foot lifting rear lever 16 through an upper screw.

[0028] As another embodiment of the connecting member, the connecting member can adopt a connecting rod, and the lower mounting hole and the upper mounting hole are located at both ends of the connecting rod, and the connecting rod is twisted in the middle so that the lower mounting hole and the upper mounting hole can be adapted to be connected with the second support leg 14 and the rear lever 16 for lifting the presser foot.

[0029] In addition, a baffle ring 20 is provided on the upper feed tooth control eccentric wheel 11, one end of the upper feed control connecting rod 17 is mounted on the upper feed tooth control eccentric wheel 11, and a baffle plate 21 is provided on the outer side surface of the upper feed tooth control eccentric wheel 11. The baffle plate 21 is fixed on the upper feed tooth control eccentric wheel 11 to limit one end of the upper feed control connecting rod 17 between the baffle ring 20 and the baffle plate 21.

[0030] The rotating shaft 9 of the motor 6 of the utility model has a presser foot lifting angle zone and a differential momentum adjustment zone within a range of 360°, which is a rotation circle. The two angle zones are independent of each other. Therefore, the cam surface of the presser foot lifting cam 10 of the utility model includes a presser foot lifting driving section 22 and a base circle section 23. The presser foot lifting driving section 22 is a variable diameter area, and the radius from the presser foot lifting driving section 22 to the center of the presser foot lifting cam 10 changes gradually. When the roller 15 rolls on the presser foot lifting driving section 22, the presser foot 2 lifting height can be adjusted according to the change of the radius. When the presser foot 2 is located at the maximum radius, the presser foot 2 height is the maximum, and when the presser foot 2 is located at the minimum radius, the presser foot 2 height is the minimum. The base circle section 23 is an equal diameter area, and the radius from the base circle section 23 to the center of the presser foot lifting cam 10 is constant. When the roller 15 rolls on the base circle section 23, the presser foot lifting mechanism does not act.

[0031] Further, the presser foot lifting mechanism of the present invention includes a presser foot lifting rear lever 16 rotating around a first fixed fulcrum, and a presser foot lifting front lever 24 rotating around a second fixed fulcrum. The first arm of the presser foot lifting rear lever 16 is connected to the connecting piece, and the second arm is connected to one end of the presser foot lifting front lever 24 through a presser foot lifting rod 25. The other end of the presser foot lifting front lever 24 is connected to a pressure rod guide frame 27 through a lifting plate 26. The pressure rod guide frame 27 is arranged on the pressure rod 28, and the presser foot 2 is arranged at the lower end of the pressure rod 28.

[0032] The upper differential feeding mechanism includes a differential swing shaft 29, an upper differential connecting rod 30 and an upper feeding crank 31 which are arranged parallel to the upper shaft 1. An upper differential eccentric wheel is arranged on the differential swing shaft 29. One end of the upper differential connecting rod 30 is sleeved on the upper differential eccentric wheel, and the other end is connected to one end of the first feeding long pendulum plate 32 and the second feeding long pendulum plate 33 through a feeding connecting rod pin. The other end of the first feeding long pendulum plate 32 is rotatably connected to the upper swing seat 4, and the other end of the second feeding long pendulum plate 33 is connected to one end of the upper feeding crank 31 through a feeding connecting rod crank pin. The other end of the upper feeding crank 31 is fixed on the differential swing shaft 29.

[0033] The differential swing shaft 29 is also provided with a presser foot swing fork 34, and the presser foot swing fork 34 is provided with a fork. The upper end of the presser foot swing crank 35 is provided with a swing slider, and the lower end is provided on the presser foot swing shaft 36. The swing slider is slid in the fork. The presser foot swing shaft 36 is also provided with a sliding sleeve 37, and the sliding sleeve 37 is sleeved on the presser foot swing bushing 38. The presser foot swing bushing 38 is sleeved outside the presser foot swing rod 39. The presser foot swing rod 39 is provided with an upper tooth feed slider pin 40 that penetrates radially. The two ends of the upper tooth feed slider pin 40 extend out of the presser foot swing bushing 38 and are provided with upper tooth feed sliders. The two upper tooth feed sliders are arranged in the slider groove of the presser foot slider guide 41, and the presser foot slider guide 41 is fixedly arranged on The lower end of the pressure rod 28 is provided with a presser foot lifting shaft 42 inside the pressure rod 28, and the upper end of the presser foot lifting shaft 42 is provided with a radially penetrating presser foot lifting pin 43, and a presser foot lifting pin movable groove is provided on the pressure rod 28, and both ends of the presser foot lifting pin 43 extend out of the presser foot lifting pin movable groove, and a pressure regulator 44 is provided at the upper end of the pressure rod 28, and a spring is provided between the presser foot lifting shaft 42 and the pressure regulator 44, and the lower end of the presser foot swing rod 39 is hinged to the roller guide frame 45, and the roller guide frame 45 includes a roller groove, and an upper feed tooth roller 46 is provided at the end of the presser foot lifting shaft 42 through the upper feed tooth roller pin, and the upper feed tooth roller 46 is rotatably set in the roller groove, and the upper feed tooth 3 is set on the roller guide frame 45.

[0034] When the rotating shaft 9 of the motor 6 rotates in the presser foot lifting angle area, the presser foot lifting action is performed, and the roller 15 rolls in the presser foot lifting driving section 22 of the presser foot lifting cam to lift the presser foot 2; at this time, the upper differential feeding mechanism does not perform differential amount adjustment.

[0035] When adjusting the differential, the motor 6 runs in the differential adjustment area, driving the upper feeding tooth control eccentric wheel 11 to rotate. Since the rotation center of the motor 6 is eccentric to the feeding tooth control eccentric wheel 11 and the upper feeding control link 17, the upper feeding control link 17 drives the upper swing seat 4 to rotate around its feeding swing seat fixing pin 47, thereby changing the position angle of the upper swing seat 4, changing the transmission ratio between the upper differential link 30 and the upper feeding crank 31, and correspondingly changing the swing amplitude of the differential swing shaft 29, causing the front and rear feed amount of the upper feeding tooth 3 at the end to change, realizing the automatic adjustment of the differential. In this process, the roller 15 rolls on the base circle segment 23 of the presser foot lifting cam 10, the presser foot lifting top plate 7 remains stationary, the presser foot lifting mechanism does not move, and the presser foot 2 remains stationary.

[0036] When the presser foot 2 is lifted, the motor 6 enters the presser foot lifting angle zone from the differential quantity adjustment zone, the motor 6 runs in the presser foot lifting angle zone, drives the presser foot lifting cam 10 to rotate, the roller 15 rolls on the presser foot lifting driving section 22 of the presser foot lifting cam 10, and then pushes the presser foot lifting top plate 7 to rotate around the presser foot lifting top plate pin 12, pulls the presser foot lifting rear lever 16 to rotate through the connecting piece, and then drives the presser foot lifting front lever 22 to rotate through the pull rod 23, lifts the presser foot lifting plate 26 upward, the presser foot lifting plate 26 drives the pressure rod guide frame 27 to move upward and then drives the pressure rod 28 to move upward, and finally moves the presser foot 2 and the upper feed dog 3 up at the same time.

[0037] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A sewing machine with a presser foot lift and differential adjustment driven by a single motor, comprising an upper shaft (1), a presser foot (2), a presser foot lift mechanism, and an upper differential feeding mechanism connected to the upper shaft (1), wherein the upper differential feeding mechanism comprises an upper feeding tooth (3) and an upper swing seat (4), and is characterized in that: The invention also comprises a motor (6) and a presser foot lifting top plate (7). A presser foot lifting cam (10) and an upper feeding tooth control eccentric wheel (11) are arranged on the rotating shaft (9) of the motor (6). The presser foot lifting top plate (7) is rotatably connected to the casing (8) and comprises two first legs (13) and a second leg (14). A roller (15) is arranged on the first leg (13). The second leg (14) is connected to a presser foot lifting rear lever (16) of the presser foot lifting mechanism through a connecting piece. The roller (15) rolls along the cam surface of the presser foot lifting cam (10). The upper feeding tooth control eccentric wheel (11) is connected to the upper swing seat (4) through an upper feeding control connecting rod (17).

2. A sewing machine with presser foot lift and differential adjustment driven by a single motor according to claim 1, characterized in that: The presser foot lifting top plate (7) is connected to the housing (8) via a presser foot lifting top plate pin (12), and the presser foot lifting top plate (7) can rotate around the axis of the presser foot lifting top plate pin (12).

3. A sewing machine with presser foot lifting and differential adjustment driven by a single motor according to claim 1, characterized in that: The connecting member comprises a lower joint bearing (18) and an upper joint bearing (19), the lower joint bearing (18) and the upper joint bearing (19) are connected via a screw, the lower joint bearing (18) comprises a lower mounting hole, the upper joint bearing (19) comprises an upper mounting hole, the axes of the upper mounting hole and the lower mounting hole are not in the same plane, the lower mounting hole is connected to the second support leg (14) of the presser foot lifting top plate (7) via a lower screw, and the upper mounting hole is connected to the presser foot lifting rear lever (16) via an upper screw.

4. A sewing machine with presser foot lifting and differential adjustment driven by a single motor according to claim 1, characterized in that: The cam surface of the presser foot lifting cam (10) includes a presser foot lifting driving section (22) and a base circle section (23); the rotation angle of the motor (6) has a presser foot lifting rotation angle area and a differential adjustment area that are independent of each other; when the motor (6) is operating in the presser foot lifting rotation angle area, the roller (15) rolls on the presser foot lifting driving section (22) of the presser foot lifting cam (10); when the motor (6) is operating in the differential adjustment area, the roller (15) rolls on the base circle section (23) of the presser foot lifting cam (10).

5. A sewing machine with presser foot lift and differential adjustment driven by a single motor according to claim 1, characterized in that: The upper feeding tooth control eccentric wheel (11) is provided with a retaining ring (20), one end of the upper feeding control connecting rod (17) is sleeved on the upper feeding tooth control eccentric wheel (11), and a retaining plate (21) is provided on the outer side of the upper feeding tooth control eccentric wheel (11), and the retaining plate (21) is fixed on the upper feeding tooth control eccentric wheel (11) to limit one end of the upper feeding control connecting rod (17) between the retaining ring (20) and the retaining plate (21).

6. A sewing machine with presser foot lifting and differential adjustment driven by a single motor according to claim 1, characterized in that: The presser foot lifting mechanism comprises a presser foot lifting rear lever (16) rotating around a first fixed fulcrum, and a presser foot lifting front lever (24) rotating around a second fixed fulcrum, the first arm of the presser foot lifting rear lever (16) being connected to a connecting piece, the second arm being connected to one end of the presser foot lifting front lever (24) via a presser foot lifting pull rod (25), the other end of the presser foot lifting front lever (24) being connected to a pressure rod guide frame (27) via a lifting plate (26), the pressure rod guide frame (27) being arranged on a pressure rod (28), and the presser foot (2) being arranged at the lower end of the pressure rod (28).

7. A sewing machine with presser foot lifting and differential adjustment driven by a single motor according to claim 6, characterized in that: The upper differential feeding mechanism comprises a differential swing shaft (29) arranged parallel to the upper shaft (1), an upper differential connecting rod (30) and an upper feeding crank (31); an upper differential eccentric wheel is arranged on the differential swing shaft (29); one end of the upper differential connecting rod (30) is sleeved on the upper differential eccentric wheel, and the other end is connected to a first feeding long swing plate (32) and one end of a second feeding long swing plate (33) through a feeding connecting rod pin; the other end of the first feeding long swing plate (32) is rotatably connected to the upper swing seat (4); the other end of the second feeding long swing plate (33) is connected to one end of the upper feeding crank (31) through a feeding connecting rod crank pin; and the other end of the upper feeding crank (31) is fixedly arranged on the differential swing shaft (29).

8. A sewing machine with presser foot lifting and differential adjustment driven by a single motor according to claim 7, characterized in that: The differential swing shaft (29) is also provided with a presser foot swing fork (34), the presser foot swing fork (34) is provided with a fork opening, the upper end of the presser foot swing crank (35) is provided with a swing slider, and the lower end is provided on the presser foot swing shaft (36), the swing slider is slidably arranged in the fork opening, the presser foot swing shaft (36) is also provided with a sliding sleeve (37), the sliding sleeve (37) is sleeved on the presser foot swing bushing (38), the presser foot swing bushing (38) is sleeved outside the presser foot swing rod (39), the presser foot swing rod (39) is provided with an upper tooth feed slider pin (40) penetrating in the radial direction, the two ends of the upper tooth feed slider pin (40) extend out of the presser foot swing bushing (38) and are provided with upper tooth feed sliders, the two upper tooth feed sliders are arranged in the slider groove of the presser foot slider guide frame (41), and the presser foot slider guide frame (41) is fixedly arranged on the presser foot swing rod (39). The lower end of the press rod (28) is provided with a presser foot lifting shaft (42) in the press rod (28), the upper end of the presser foot lifting shaft (42) is provided with a presser foot lifting pin (43) which penetrates radially, the press rod (28) is provided with a presser foot lifting pin movable groove, the two ends of the presser foot lifting pin (43) extend out of the presser foot lifting pin movable groove, the upper end of the press rod (28) is provided with a pressure regulator (44), a spring is provided between the presser foot lifting shaft (42) and the pressure regulator (44), the lower end of the presser foot swing rod (39) is hinged with a roller guide frame (45), the roller guide frame (45) includes a roller groove, an upper feeding tooth roller (46) is provided at the end of the presser foot lifting shaft through an upper feeding tooth roller pin, the upper feeding tooth roller (46) is rotatably arranged in the roller groove, and the upper feeding tooth (3) is arranged on the roller guide frame (45).

9. A sewing machine with presser foot lifting and differential adjustment driven by a single motor according to claim 1, characterized in that: The upper feeding teeth (3) comprise two feeding presser feet (5) arranged side by side and at intervals, and the presser foot (2) is arranged between the two feeding presser feet (5).

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