Presser foot lifting mechanism of sewing machine

Abstract

The utility model discloses a presser foot lifting mechanism of a sewing machine. The presser foot lifting mechanism comprises a motor, a lifting and pressing arm, a sliding block seat, an adapter connecting rod, a middle pressing rod and a presser foot, the output end of the motor is connected with an output shaft, and the other end of the output shaft is connected with the lifting and pressing arm. The switching connecting rod comprises a first connecting arm, a second connecting arm and a third connecting arm, the first connecting arm is in shaft connection with the sliding block seat, and the second connecting arm and the third connecting arm are connected with the lifting and pressing arm and the middle pressing rod respectively, so that the lifting and pressing arm and the middle pressing rod are linked around a shaft; a guide sliding groove is formed in the sliding block base, the middle pressing rod is connected with the guide sliding groove, and the lower end of the middle pressing rod is connected with the pressing foot. The pressure acting on the middle pressure bar and the smoothness of up-down movement can be effectively guaranteed through the short arm and the switching connecting rod structure, the pressure applied to cloth by the presser foot is further guaranteed, and the stability of sewing stitches and the positioning accuracy of the cloth are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment, and in particular to a sewing machine presser foot lifting mechanism. Background Technology

[0002] In the field of sewing equipment, the presser foot lifting mechanism is the core component that controls the pressure applied by the presser foot to the fabric. Its performance directly affects the stability of the sewing stitch and the fabric positioning accuracy. Traditional presser foot lifting mechanisms are usually driven by a motor, which transmits power to the pressure bar through a mechanical transmission structure, ultimately driving the presser foot to achieve lifting and lowering movement.

[0003] However, in existing technologies, such as the presser foot lifting mechanism disclosed in patent document CN201520728559.6, the motor mounting position is linked to the intermediate pressure bar via a long tie rod. Because the transmission path from the motor output end to the intermediate pressure bar (presser rod) is too long, power must be transmitted sequentially through multiple hinged structures such as the long arm and tie rod. During this process, insufficient rigidity of the long arm easily leads to elastic deformation, while the gap between the tie rod and the hinge point further exacerbates kinetic energy loss, ultimately significantly reducing the actual pressure applied to the presser foot and affecting the final pressing of the presser foot onto the fabric. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a sewing machine presser foot lifting mechanism. This invention, through a short arm and a connecting rod structure, can effectively ensure the pressure acting on the middle presser bar and the smoothness of its up and down movement, thereby ensuring the pressure applied by the presser foot to the fabric, and ensuring the stability of the sewing stitch and the positioning accuracy of the fabric.

[0005] To achieve the above objectives, this utility model provides a sewing machine presser foot lifting mechanism, including: a motor, a presser arm, a slider seat, a connecting rod, a middle press bar, and a presser foot;

[0006] The output end of the motor is connected to an output shaft, and the other end of the output shaft is connected to the lifting arm;

[0007] The adapter link includes a first connecting arm, a second connecting arm and a third connecting arm. The first connecting arm is connected to the slider seat shaft, and the second connecting arm and the third connecting arm are respectively connected to the lifting arm and the middle pressure bar, so that the lifting arm and the middle pressure bar can achieve linkage around the shaft.

[0008] A guide groove is provided on the slider seat, the intermediate pressure bar is connected to the guide groove, and the lower end of the intermediate pressure bar is connected to the pressure foot.

[0009] Furthermore, the second and third connecting arms are on the same horizontal line and inclined relative to the first connecting arm, with the arm length of the second connecting arm being greater than that of the third connecting arm. By setting the arm length of the second connecting arm to be greater than that of the third connecting arm, an asymmetrical lever structure is formed. When the motor drives the first connecting arm to tilt, the long arm characteristic of the second connecting arm amplifies the input torque, while the short arm design of the third connecting arm, through the reasonable offset of the fulcrum position, efficiently converts the amplified torque into the vertical pressure of the centering pressure bar, directly compensating for the force attenuation problem caused by long-distance transmission. Moreover, the second and third connecting arms are on the same horizontal line and form an inclined angle with the first connecting arm, constituting a stable triangular force transmission frame. This structure eliminates the redundant degrees of freedom of traditional multi-stage hinges, significantly reduces the elastic deformation and kinetic energy loss caused by joint clearance during the swing of the connecting rod, and improves the utilization rate of the motor output power by more than 40%.

[0010] Furthermore, the system includes a first lifting and pressing link, with one side of the lifting and pressing arm extending to form a fourth connecting arm. The two ends of the first lifting and pressing link are connected to the fourth connecting arm and the second connecting arm, respectively, to achieve linkage between the lifting and pressing arm and the second connecting arm. The first lifting and pressing link, together with the fourth and second connecting arms, forms a four-bar closed-loop structure. This design superimposes bidirectional constraints on the original tilting arm system. Through the mutual restraint between rigid nodes, this effectively suppresses the bending deformation of the second connecting arm due to its long arm characteristics, ensuring that the amplified torque is transmitted losslessly to the intermediate pressure bar along a preset path.

[0011] Furthermore, a second lifting and pressing link is included, with a pressing rod connector fixedly connected to the middle of the intermediate pressure bar. The pressing rod connector has a connector connection part, and both ends of the second lifting and pressing link are respectively connected to the connector connection part and the third connecting arm, realizing the linkage between the intermediate pressure bar and the third connecting arm. This further optimizes the power transmission path and enhances the precise control and stability of the pressure foot pressure.

[0012] Furthermore, one side of the clamping rod joint extends outward to form a limiting sliding block, which is inserted into the guide groove to realize the up-and-down movement of the intermediate pressure bar. This prevents radial movement of the intermediate pressure bar, ensuring that the intermediate pressure bar can only move up and down along the guide groove when under force.

[0013] Furthermore, it also includes a sensor and a sensor mounting base for mounting the sensor. The sensor mounting base has an overall "Z"-shaped structure, with the front end of the sensor mounting base folded inward to form a mounting position. The sensor is fixed to this mounting position with screws. The other end of the sensor mounting base away from the mounting position is fixedly connected to the slider seat, making the sensor adjacent to the intermediate pressure bar. By designing the sensor mounting base into a "Z"-shaped structure, the sensor mounting base has sufficient rigidity to allow the mounting position to extend outward and align with the clamping rod joint. By detecting the movement of the corresponding position of the clamping rod joint through the sensor, the intermediate pressure bar can be monitored.

[0014] Furthermore, it also includes a cooling fan, which is mounted behind the motor via a fan mounting bracket. This mechanism effectively improves the motor's heat dissipation performance, ensuring the stability and reliability of the pressure foot lifting mechanism under prolonged high-load operation.

[0015] Furthermore, it also includes an air guide plate, which is fixed to the rear side of the motor and faces the cooling fan. One end of the air guide plate extends towards the pressure bar to form an air guide section, and the other end of the air guide section is folded back to form a wind deflector section, which is located directly behind the motor. The air guide plate and the cooling fan are positioned facing each other to form a directional airflow channel, which concentrates the cooling airflow to the core heat-generating area of ​​the motor, thereby improving the motor's heat dissipation efficiency.

[0016] Furthermore, it also includes an upper bushing and a lower bushing, which are movably fitted onto the upper and lower ends of the intermediate pressure bar, respectively, for guiding the intermediate pressure bar. The upper and lower bushings significantly improve the movement stability and guiding accuracy of the intermediate pressure bar, effectively preventing swaying during high-speed movement and ensuring that the pressure foot pressure acts perpendicularly on the fabric surface.

[0017] Furthermore, the motor is a stepper motor.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. By setting up a pivot-type linkage transmission method with a transfer link, a first lifting link, and a second lifting link, the transmission distance of the long link structure in the prior art can be effectively shortened. This can effectively ensure the pressure acting on the middle pressure bar and the smoothness of its up and down movement, ensure the pressing force of the presser foot on the fabric, and improve the sewing quality of the sewing machine.

[0020] 2. The use of a slider seat with a pressure rod joint and a double guide structure of upper and lower bushings can significantly improve the movement stability and guiding accuracy of the middle pressure bar, prevent the radial rotation of the middle pressure bar from causing swaying, and ensure that the pressure foot pressure is applied vertically to the fabric surface.

[0021] 3. Equipped with sensors to accurately monitor the up-and-down movement of the intermediate pressure bar, thereby improving the accuracy of the up-and-down movement of the intermediate pressure bar and preventing swaying phenomena from occurring, thus stopping the machine in time and protecting the safety of the components.

[0022] 4. A cooling fan and air guide plate are installed at the rear of the motor. The air guide plate and the cooling fan are arranged facing each other to form a directional airflow channel, which concentrates the cooling airflow to the core heat-generating area of ​​the motor, thereby improving the heat dissipation efficiency of the motor and thus extending the service life of the motor. Attached Figure Description

[0023] To more clearly illustrate the technology in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural schematic diagram of a sewing machine presser foot lifting mechanism according to this utility model;

[0025] Figure 2 yes Figure 1 A schematic diagram of the decomposition process;

[0026] Figure 3 This is a schematic diagram of the lifting and pressing arm of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the adapter connecting rod of this utility model;

[0028] Figure 5 This is an assembly diagram of the first lifting and pressing link and the second lifting and pressing link of this utility model;

[0029] Figure 6 This is a schematic diagram of the slider seat of this utility model;

[0030] Figure 7 This is a structural schematic diagram of the clamping rod connector of this utility model;

[0031] Figure 8 This is a schematic diagram showing the connection status of the lifting arm, the first lifting connecting rod, the transition connecting rod, the second lifting connecting rod, the clamping rod joint, and the slider seat of this utility model.

[0032] Figure 9 This is a structural schematic diagram of the first screw, second screw, third screw, fourth screw, or fifth screw of this utility model;

[0033] Figure 10 yes Figure 9 A cross-sectional view along line AA;

[0034] Figure 11 This is a schematic diagram of the present invention installed on the housing of a sewing machine.

[0035] The diagram includes:

[0036] 1. Motor; 11. Output shaft; 2. Lifting arm; 21. First opening; 22. First screw; 221. Screw head; 222. Rod body; 223. First connecting part; 224. Second connecting part; 225. Oil hole; 226. Locking hole; 23. Fourth connecting arm; 231. Fourth connecting hole; 3. Slider seat; 31. Fifth connecting hole; 32. Guide groove; 4. Adapter connecting rod; 41. First lifting connecting rod; 411. Sixth connecting hole; 412. Seventh connecting hole; 42. Second lifting connecting rod; 421. Ninth connecting hole; 422. Tenth connecting hole; 43. First connecting arm; 431. First connecting hole; 44. Second connecting arm Arm; 441, Second connecting hole; 45, Third connecting arm; 451, Third connecting hole; 46, Second screw; 47, Third screw; 48, Fourth screw; 49, Fifth screw; 5, Middle pressure bar; 51, Pressure rod connector; 511, Connector connection part; 512, Eighth connecting hole; 513, Collar; 514, Second opening; 515, Limiting sliding block; 52, Upper bushing; 53, Lower bushing; 6, Sensor; 61, Sensor mounting base; 611, Mounting position; 612, Sensing screw; 7, Cooling fan; 71, Air guide plate; 711, Air guide part; 712, Windproof part; 72, Fan mounting base; 8, Pressure foot; 9, Housing. Detailed Implementation

[0037] The technology of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0039] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0040] Please see Figures 1 to 11 The present invention provides a sewing machine presser foot lifting mechanism, including: a motor 1, a presser arm 2, a slider seat 3, a connecting rod 4, a first presser rod 41, a second presser rod 42, a middle presser bar 5, a sensor 6, a sensor fixing seat 61, a cooling fan 7, an air guide plate 71, and a presser foot 8.

[0041] like Figure 3 As shown, this utility model is directly installed on the housing 9 of the sewing machine. In this embodiment, the motor 1 is a stepper motor. The output end of the motor 1 is connected to an output shaft 11. The other end of the output shaft 11 is connected to the lifting arm 2. The lifting arm 2 is a ring structure. A first opening 21 is provided on one side of the lifting arm 2. During assembly, the lifting arm 2 is first sleeved on the output shaft 11, and then the first opening 21 is locked by the first screw 22. A fourth connecting arm 23 extends from the side wall of the lifting arm 2.

[0042] like Figure 2 He Ru Figure 4 As shown, the adapter link 4 includes a first connecting arm 43, a second connecting arm 44, and a third connecting arm 45. The second connecting arm 44 and the third connecting arm 45 are on the same horizontal line and are inclined to the first connecting arm 43, thus forming a T-shaped mechanism. Preferably, the arm length of the second connecting arm 44 is greater than the arm length of the third connecting arm 45. Together with the first connecting arm 43, the second connecting arm 44, and the third connecting arm 45, they form an asymmetrical lever structure. When the motor 1 drives the first connecting arm 43 to tilt, the long arm characteristic of the second connecting arm 44 can amplify the input torque, while the short arm design of the third connecting arm 45, through the reasonable offset of the fulcrum position, efficiently converts the amplified torque into the vertical pressure of the central pressure bar 5, directly compensating for the force attenuation problem caused by long-distance transmission. The specific lengths can be set to a ratio of 2:1, 3:1, or 3.5:1 between the arm lengths of the second connecting arm 44 and the third connecting arm 45, thereby obtaining a more suitable lever structure, which can be set according to actual needs.

[0043] A first connecting hole 431, a second connecting hole 441, and a third connecting hole 451 are respectively provided on the first connecting arm 43, the second connecting arm 44, and the third connecting arm 45. A fourth connecting hole 231 is provided on the fourth connecting arm 23, and a fifth connecting hole 31 is provided on the slider seat 3. The first connecting hole 431 and the fifth connecting hole 31 are matched and connected by a first screw 22, so as to realize the shaft linkage between the first connecting arm 43 and the slider seat 3, that is, the connecting rod 4 can rotate around the first screw 22.

[0044] like Figure 2 and Figure 5As shown, the two ends of the first lifting link 41 are connected to the fourth connecting arm 23 and the second connecting arm 44 respectively, realizing the linkage between the lifting arm 2 and the second connecting arm 44. Specifically, a sixth connecting hole 411 and a seventh connecting hole 412 are provided at the front and rear ends of the first lifting link 41. The sixth connecting hole 411 matches the fourth connecting hole 231 and is connected by a second screw 46. The seventh connecting hole 412 matches the second connecting hole 441 and is connected by a third screw 47.

[0045] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, a clamping rod connector 51 is fixedly connected to the middle position of the intermediate pressure rod 5. The clamping rod connector 51 is provided with a connector connection part 511. A collar 513 for passing through the intermediate pressure rod is formed on the rear side of the connector connection part 511. A second opening 514 is provided on one side of the collar 513 and locked by a screw. An eighth connection hole 512 is formed on the connector connection part 511. The two ends of the second lifting connecting rod 42 are respectively provided with a ninth connection hole 421 and a tenth connection hole 422. The ninth connection hole 421 matches the third connection hole 451 and is connected by a fourth screw 48. The tenth connection hole 422 matches the eighth connection hole 512 and is connected by a fifth screw 49, thereby realizing the linkage between the intermediate pressure rod 5 and the third connecting arm 45.

[0046] like Figure 9 and Figure 10As shown, to ensure the flexibility of the connection of the above components, the first screw 22, the second screw 46, the third screw 47, the fourth screw 48, and the fifth screw 49 all include a screw head 221 and a shaft 222. The shaft 222 includes a first connecting part 223 and a second connecting part 224. The diameter of the shaft including the first connecting part 223 is larger than that of the second connecting part 224. An oil hole 225 is provided through the first connecting part 223. A locking hole 226 communicating with the oil hole 225 is newly opened in the screw head 221. Lubricating oil can be injected through the locking hole 226. The lubricating oil can enter the oil hole 225 through the locking hole 226 and flow into the gap of the connection from the oil hole 225 to increase the lubrication between the first connecting part 223 and other components. The lubrication effect improves the smoothness of rotation, reduces friction, and after grease is applied, the locking hole 226 can be directly sealed and locked by screws. In this embodiment, the diameter of the first connecting hole 431 is larger than the diameter of the fifth connecting hole 31; the diameter of the sixth connecting hole 411 is the same as the diameter of the fourth connecting hole 231; the diameter of the seventh connecting hole 412 is the same as the diameter of the second connecting hole 441; the diameter of the ninth connecting hole 421 is the same as the diameter of the third connecting hole 451; and the diameter of the tenth connecting hole 422 is the same as the diameter of the eighth connecting hole 512. This is to match the connection of the first screw 22, the second screw 46, the third screw 47, the fourth screw 48, and the fifth screw 49. Taking the connection of the first connecting hole 431, the fifth connecting hole 31, and the first screw 22 as an example, please refer to... Figure 7 During assembly, the first connecting arm 43 is placed above the slider seat 3 so that the first connecting hole 431 and the fifth connecting hole 31 are aligned. Then, the first screw 22 is inserted so that the second connecting part 224 abuts and is fixed to the fifth connecting hole 31. The first connecting part 223 abuts against the first connecting hole 431. After lubricating oil is injected, the lubricating oil will act between the hole wall of the first connecting hole 431 and the first connecting part 223, thereby realizing the shaft rotation of the first connecting arm 43. The structure of other components is the same and will not be described in detail.

[0047] like Figure 6 As shown, a guide groove 32 is provided on the slider seat 3. One side of the clamping rod joint 51 extends outward to form a limiting sliding block 515. The limiting sliding block 515 is inserted into the guide groove 32. The lower end of the middle pressure rod 5 is connected to the pressure foot 8 to prevent the radial movement of the middle pressure rod 5. When the middle pressure rod 5 is under force, it can only move up and down along the guide groove 32.

[0048] In this embodiment, the sensor mounting base 61 has an overall "Z" shaped structure. The front end of the sensor mounting base 61 is folded inward to form a mounting position 611. The sensor 6 is fixed to the mounting position 611 by screws. The other end of the sensor mounting base 61 away from the mounting position 611 is fixedly connected to the slider seat 3. In order for the sensor 6 to achieve more accurate monitoring of the pressure bar 5, a sensing screw 612 is connected to the screw head 221 of the fifth screw 49. One end of the sensing screw 612 extends toward the sensor 6 and is close to the sensor 6. Thus, the sensor 6 only needs to detect the movement of the sensing screw 612 to achieve monitoring of the pressure bar 5.

[0049] The cooling fan 7 is mounted behind the motor 1 via a fan mounting bracket 72, as shown below. Figure 11 The fan mounting bracket 72 can be directly installed on the sewing machine housing 9. The air guide plate 71 is fixed to the rear side of the motor 1 and is set facing the cooling fan 7. One end of the air guide plate 71 extends towards the central pressure bar 5 to form an air guide section 711. The other end of the air guide section 711 is folded back to form a wind baffle section 712. The wind baffle section 712 is placed directly behind the motor 1. The air guide plate 71 and the cooling fan 7 are set facing each other to form a directional airflow channel, which concentrates the cooling airflow to the heat-generating core area of ​​the motor 1, thereby improving the heat dissipation efficiency of the motor 1.

[0050] To further limit the vertical axial movement of the intermediate pressure bar 5 and avoid swaying due to structural damage, this embodiment also includes an upper bushing 52 and a lower bushing 53, as shown below. Figure 11 The upper bushing 52 and the lower bushing 53 are respectively movably sleeved at the upper and lower ends of the middle pressure bar 5, and the upper bushing 52 and the lower bushing 53 are fixed to the machine housing 9 of the sewing machine for guiding the middle pressure bar 5.

[0051] The working principle of this utility model is briefly described as follows: Motor 1 drives the lifting arm 2 to swing clockwise and counterclockwise. Through the cooperation of the connecting rod 4, the first lifting rod 41, and the second lifting rod 42, the pressing rod joint 51 moves up and down. The limiting sliding block 515 formed by the pressing rod joint 51 is connected to the slider seat 3 to prevent the radial rotation of the middle pressure bar 5. The slider seat 3 can be integrated into the housing 9. The pressing rod joint 51 drives the middle pressure bar 5 and the pressing foot 8 to move up and down. Thus, this utility model, through the structure of the short arm of the lifting arm 2 and a connecting rod 4, can effectively ensure the pressure acting on the middle pressure bar 5 and the smoothness of its up and down movement.

[0052] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A sewing machine presser foot lifting mechanism, characterized in that, include: Motor (1), lifting arm (2), slider seat (3), connecting rod (4), intermediate pressure bar (5), and pressure foot (8); The output end of the motor (1) is connected to an output shaft (11), and the other end of the output shaft (11) is connected to the lifting arm (2); The adapter link (4) includes a first connecting arm (43), a second connecting arm (44) and a third connecting arm (45). The first connecting arm (43) is axially connected to the slider seat (3). The second connecting arm (44) and the third connecting arm (45) are respectively connected to the lifting arm (2) and the middle pressure bar (5), so that the lifting arm (2) and the middle pressure bar (5) can achieve axial linkage. A guide groove (32) is provided on the slider seat (3), the intermediate pressure bar (5) is connected to the guide groove (32), and the lower end of the intermediate pressure bar (5) is connected to the pressure foot (8).

2. The sewing machine presser foot lifting mechanism according to claim 1, characterized in that, The second connecting arm (44) and the third connecting arm (45) are on the same horizontal line and are inclined to the first connecting arm (43). The arm length of the second connecting arm (44) is greater than the arm length of the third connecting arm (45).

3. The sewing machine presser foot lifting mechanism according to claim 1, characterized in that, It also includes a first lifting and pressing link (41), and one side of the lifting and pressing arm (2) extends to form a fourth connecting arm (23). The two ends of the first lifting and pressing link (41) are respectively connected to the fourth connecting arm (23) and the second connecting arm (44) to realize the linkage between the lifting and pressing arm (2) and the second connecting arm (44).

4. The sewing machine presser foot lifting mechanism according to claim 1, characterized in that, The second lifting and pressing link (42) is also included. A pressing rod joint (51) is fixedly connected to the middle of the middle pressure bar (5). The pressing rod joint (51) is provided with a joint connection part (511). The two ends of the second lifting and pressing link (42) are respectively connected to the joint connection part (511) and the third connecting arm (45) to realize the linkage between the middle pressure bar (5) and the third connecting arm (45).

5. A sewing machine presser foot lifting mechanism according to claim 4, characterized in that, One side of the clamping rod joint (51) extends outward to form a limiting sliding block (515), which is inserted into the guide groove (32) to realize the up and down movement of the medium pressure rod (5).

6. A sewing machine presser foot lifting mechanism according to claim 1, characterized in that, It also includes a sensor (6) and a sensor mounting base (61) for mounting the sensor (6). The sensor mounting base (61) has an overall "Z" shaped structure. The front end of the sensor mounting base (61) is folded inward to form a mounting position (611). The sensor (6) is fixed to the mounting position (611) by screws. The other end of the sensor mounting base (61) away from the mounting position (611) is fixedly connected to the slider seat (3), so that the sensor (6) is adjacent to the intermediate pressure rod (5).

7. A sewing machine presser foot lifting mechanism according to claim 1, characterized in that, It also includes a cooling fan (7), which is mounted behind the motor (1) via a fan mounting bracket (72).

8. A sewing machine presser foot lifting mechanism according to claim 7, characterized in that, It also includes an air guide plate (71), which is fixed to the rear side of the motor (1) and is arranged facing the cooling fan (7). One end of the air guide plate (71) extends towards the pressure bar (5) to form an air guide section (711), and the other end of the air guide section (711) is folded back to form a wind baffle section (712), which is located directly behind the motor (1).

9. A sewing machine presser foot lifting mechanism according to claim 1, characterized in that, It also includes an upper bushing (52) and a lower bushing (53), which are respectively movably sleeved on the upper and lower ends of the intermediate pressure rod (5) for guiding the intermediate pressure rod (5).

10. A sewing machine presser foot lifting mechanism according to claim 1, characterized in that, The motor (1) is a stepper motor.

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