Sewing machine with adjustable presser foot structure and operation method

Abstract

The invention discloses a sewing machine with an adjustable presser foot structure and an operation method. The sewing machine comprises a workbench and a machine body. The machine body is mounted on the workbench; the adjusting mechanism is used for adjusting the pressure of the presser foot on the cloth; the adjusting mechanism comprises a protruding block arranged on the machine arm and an adjusting screw rod arranged on the presser foot, an adjusting nut is installed on the portion, located on the top of the protruding block, of the adjusting screw rod in a threaded mode, the adjusting screw rod is slidably sleeved with a compression spring, the upper end of the compression spring abuts against the bottom of the protruding block, and the lower end of the compression spring abuts against the surface of the presser foot. The presser foot is provided with a connecting groove used for being connected with the connecting arm, a sliding rod is arranged at the lower end of the connecting arm, and the sliding rod can move up and down in the connecting groove. An operator can flexibly adjust the pressure of the presser foot on the cloth according to the material, thickness and sewing requirements of the cloth, the situation that the cloth is damaged or the sewing effect is affected due to improper pressure is avoided, and the sewing quality and adaptability are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sewing machine equipment, and in particular relates to a sewing machine with an adjustable presser foot structure and an operating method thereof. Background Art

[0002] A sewing machine is a machine used to sew fabrics, leather and other materials. It drives the needle and thread through a mechanical device, passes the thread through the material and interweaves it to form a seam according to a certain pattern, thereby connecting the materials together. Sewing machines have a variety of functions and styles, and can be used in many fields such as home sewing, clothing making, leather processing, etc., greatly improving the efficiency and quality of sewing, and are indispensable equipment in the textile and clothing industries.

[0003] Traditional sewing machine presser feet are mostly designed with fixed pressure, which cannot be flexibly adjusted according to different fabric materials, thicknesses and sewing requirements. For thinner fabrics, excessive presser foot pressure can easily cause the fabric to deform and wrinkle, affecting the sewing effect; while for thicker fabrics, too little presser foot pressure may cause the fabric to slide unsmoothly during sewing, resulting in uneven stitches, skipped stitches and other problems. Summary of the invention

[0004] The object of the present invention is to provide a sewing machine with an adjustable presser foot structure and an operating method, which can solve the problem that the presser foot pressure of traditional sewing machines cannot be adjusted, so that the operator can flexibly adjust the pressure of the presser foot on the fabric according to the material, thickness and sewing requirements of the fabric, avoid damage to the fabric or affect the sewing effect due to improper pressure, improve sewing quality and adaptability, and solve the problems in the prior art raised in the above background technology.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A sewing machine with an adjustable presser foot structure, comprising:

[0007] Workbench and machine body;

[0008] The machine body is installed on a workbench, a motor for driving the machine body to operate and a pedal for controlling the motor are provided at the bottom of the machine body, a machine arm for operating is provided on the machine body, a presser foot is connected to the lower end of the machine arm through a connecting arm, and a needle bar adapted to the presser foot is provided at the lower end of the machine arm;

[0009] It also includes an adjustment mechanism for adjusting the pressure of the presser foot on the fabric;

[0010] The adjusting mechanism includes a protrusion arranged on the machine arm and an adjusting screw arranged on the presser foot. The protrusion is provided with a hole for the adjusting screw to pass through. The adjusting screw is inserted into the hole, and an adjusting nut is threadedly installed on the adjusting screw at the top of the protrusion. A compression spring is slidably sleeved on the adjusting screw. The upper end of the compression spring abuts against the bottom of the protrusion, and the lower end of the compression spring abuts against the surface of the presser foot. The presser foot is provided with a connecting groove for connecting with the connecting arm. A sliding rod is provided at the lower end of the connecting arm, and the sliding rod can move up and down in the connecting groove.

[0011] Preferably, a supporting structure for supporting the equipment is provided at the bottom of the workbench, and the supporting structure includes a first upper bracket and a second upper bracket arranged on both sides of the bottom of the workbench, and a first lower bracket located at the bottom of the first upper bracket and a second lower bracket located at the bottom of the second upper bracket, and a base is provided at the bottom of the first bracket and the second lower bracket.

[0012] Preferably, a lifting screw is threadedly mounted on the first upper bracket for adjusting the height of the workbench, the lower part of the lifting screw is rotatably connected to the top of the first lower bracket, and a hand wheel is provided at the lower end of the lifting screw.

[0013] Preferably, a bearing seat is provided on the first lower bracket, and the lower part of the lifting screw is inserted and fixed to the inner ring of the bearing of the bearing seat.

[0014] Preferably, a guide rod is provided at the bottom of the second upper bracket, a guide sleeve is provided at the top of the second lower bracket, and the guide rod is slidably inserted into the interior of the guide sleeve.

[0015] Preferably, a positioning rack is provided on one side outer wall of the guide rod, a notch is opened on one side of the guide sleeve, the notch is opposite to the positioning rack, a rib-shaped plate is provided outside the notch, a positioning rod is slidably inserted on the rib-shaped plate, a positioning block is provided at one end of the positioning rod, the positioning block and the positioning rack are adapted and locked by a pin rod to position the guide rod to prevent the workbench from falling.

[0016] Preferably, a pull rod is provided at the other end of the positioning rod, a ring is provided on the outer wall of the convex plate, the positioning rod is slidably inserted into the ring, a through hole is provided on the ring for the pin rod to pass through, and a positioning hole is provided on the positioning rod for inserting the pin rod.

[0017] A sewing machine having an adjustable presser foot structure and a method for operating the sewing machine having the adjustable presser foot structure, comprising the following steps:

[0018] S1. Preparation: Place the sewing machine in a suitable position and adjust the height of the workbench according to the height of the operator or the needs of sewing work;

[0019] S2. Install the fabric: Place the fabric to be sewn on the workbench and adjust the position;

[0020] S3. Adjust the pressure of the presser foot: Rotate the adjusting nut to adjust the pressure of the presser foot according to actual needs. After adjusting to the appropriate pressure, stop rotating the adjusting nut.

[0021] S4, start sewing: step on the pedal of the control motor to drive the machine body to work, and the needle bar at the lower end of the machine arm cooperates with the presser foot to sew the fabric. During the sewing process, if the presser foot pressure is found to be inappropriate according to the actual situation, step S3 can be repeated to fine-tune the pressure;

[0022] S5, end of sewing: After finishing sewing, release the pedal, stop the motor and take out the sewn fabric.

[0023] Preferably, in S1, the specific adjustment method is to rotate the handwheel of the lifting screw on the first upper bracket, rotate the handwheel clockwise to raise the lifting screw and raise the workbench; rotate the handwheel counterclockwise to lower the lifting screw and lower the workbench, and stop rotating the handwheel after adjusting to the appropriate height.

[0024] Preferably, in S3, during specific adjustment, for thinner fabrics, the adjusting nut is loosened to relax the compression spring and reduce the pressure on the presser foot. At this time, the adjusting screw moves upward in the connecting groove, and the pressure of the presser foot on the fabric is reduced; for thicker fabrics, the adjusting nut is tightened, the compression spring is compressed, and the pressure on the presser foot is increased. The adjusting screw moves downward in the connecting groove, and the pressure of the presser foot on the fabric is increased.

[0025] Technical effects and advantages of the present invention: Compared with the prior art, the sewing machine with an adjustable presser foot structure and the operating method provided by the present invention have the following advantages:

[0026] 1. The present invention can flexibly adjust the pressure of the presser foot on the cloth according to different cloth materials, thicknesses and sewing requirements through the cooperation of the adjusting nut, the adjusting screw and the compression spring in the adjusting mechanism. For thinner cloth, the compression spring can be loosened by the adjusting nut to reduce the pressure of the presser foot and avoid deformation and wrinkling of the cloth; for thicker cloth, the adjusting nut can be tightened to compress the spring to increase the pressure of the presser foot, so that the cloth can slide smoothly during the sewing process, reduce problems such as uneven stitches and skipped stitches, and improve the sewing effect.

[0027] 2. In the supporting structure at the bottom of the workbench, the lifting screw on the first upper bracket can adjust the height of the workbench to meet the height requirements of different operators or the requirements of different sewing jobs on the workbench height, thereby increasing the comfort and flexibility of using the sewing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the presser foot of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the support structure of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the guide rod of the present invention.

[0032] In the figure: 1. workbench; 2. machine body; 3. machine arm; 4. connecting arm; 5. presser foot; 6. pedal; 7. motor; 8. first upper bracket; 9. first lower bracket; 10. lifting screw; 11. bearing seat; 12. second upper bracket; 13. second lower bracket; 14. guide rod; 15. positioning rack; 16. guide sleeve; 17. shaped plate; 18. positioning rod; 19. positioning block; 20. positioning hole; 21. collar; 22. bump; 23. adjusting screw; 24. adjusting nut; 25. compression spring. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] like Figure 1-4 As shown, the present invention provides:

[0035] A sewing machine with an adjustable presser foot 5 structure, comprising:

[0036] A workbench 1 and a machine body 2; the machine body 2 is mounted on the workbench 1, a motor 7 for driving the machine body 2 to operate and a pedal 6 for controlling the motor 7 are provided at the bottom of the machine body 2, a machine arm 3 for operating is provided on the machine body 2, a presser foot 5 is connected to the lower end of the machine arm 3 through a connecting arm 4, and a needle bar adapted to the presser foot 5 is provided at the lower end of the machine arm 3;

[0037] During specific use, the machine body 2 is installed on the workbench 1, and the motor 7 is placed at the bottom of the machine body 2. The motor 7 is controlled by the pedal 6 to drive the machine body 2 to perform sewing operations. The machine arm 3 extends upward from the machine body 2, and its lower end is connected to the connecting arm 4. The connecting arm 4 is connected to the presser foot 5. The needle bar is adapted to the presser foot 5 and is also installed at the lower end of the machine arm 3. When sewing, the motor 7 drives the needle bar to reciprocate up and down. At the same time, the pedal 6 controls the rotation speed of the motor 7 to adjust the sewing speed. The presser foot 5 presses the cloth under the drive of the connecting arm 4 and cooperates with the needle bar to complete sewing.

[0038] like Figure 2 As shown:

[0039] It also includes an adjusting mechanism for adjusting the pressure of the presser foot 5 on the cloth; the adjusting mechanism includes a protrusion 22 arranged on the machine arm 3 and an adjusting screw 23 arranged on the presser foot 5, the protrusion 22 is provided with a hole for the adjusting screw 23 to pass through, the adjusting screw 23 is inserted into the hole, and an adjusting nut 24 is threadedly installed on the adjusting screw 23 at the top of the protrusion 22, a compression spring 25 is slidably sleeved on the adjusting screw 23, the upper end of the compression spring 25 abuts against the bottom of the protrusion 22, and the lower end of the compression spring 25 abuts against the surface of the presser foot 5, the presser foot 5 is provided with a connecting groove for connecting with the connecting arm 4, and a sliding rod is provided at the lower end of the connecting arm 4, and the sliding rod can move up and down in the connecting groove.

[0040] When in use, the adjusting mechanism cooperates through the adjusting nut 24, the adjusting screw 23 and the compression spring 25 to work together. The adjusting nut 24 is rotated. Since the adjusting screw 23 is threadedly connected to the adjusting nut 24, the adjusting screw 23 will move up and down in the hole of the protrusion 22. When the adjusting nut 24 is tightened, the adjusting screw 23 moves downward relative to the protrusion 22, and the compression spring 25 is compressed, exerting greater pressure on the presser foot 5, thereby increasing the pressure of the presser foot 5 on the cloth; conversely, the adjusting nut 24 is loosened, the compression spring 25 is relaxed, and the pressure of the presser foot 5 on the cloth is reduced. The connecting groove on the presser foot 5 cooperates with the sliding rod at the lower end of the connecting arm 4. When the pressure of the presser foot 5 changes, the sliding rod can move up and down in the connecting groove, thereby ensuring that the position of the presser foot 5 can be flexibly adjusted as the pressure changes.

[0041] In general, the problem that the pressure of the presser foot 5 of the traditional sewing machine cannot be adjusted can be solved, so that the operator can flexibly adjust the pressure of the presser foot 5 on the fabric according to the material, thickness and sewing requirements of the fabric, avoid damage to the fabric or affect the sewing effect due to improper pressure, and improve the sewing quality and adaptability.

[0042] like Figure 1 and 3 As shown:

[0043] The bottom of the workbench 1 is provided with a support structure for supporting the equipment, and the support structure includes a first upper bracket 8 and a second upper bracket 12 arranged on both sides of the bottom of the workbench 1, as well as a first lower bracket 9 located at the bottom of the first upper bracket 8 and a second lower bracket 13 located at the bottom of the second upper bracket 12, and a base is provided at the bottom of the first bracket and the second lower bracket 13. A lifting screw 10 is threadedly installed on the first upper bracket 8 for adjusting the height of the workbench 1. The lower part of the lifting screw 10 is rotatably connected to the top of the first lower bracket 9, and a hand wheel is provided at the lower end of the lifting screw 10. A bearing seat 11 is provided on the first lower bracket 9, and the lower part of the lifting screw 10 is plugged and fixed to the inner ring of the bearing seat 11. A guide rod 14 is provided at the bottom of the second upper bracket 12, and a guide sleeve 16 is provided at the top of the second lower bracket 13. The guide rod 14 is slidably plugged into the inside of the guide sleeve 16.

[0044] When in use, the bottom sides of the workbench 1 are supported by the first upper bracket 8 and the second upper bracket 12, respectively, which are respectively matched with the first lower bracket 9 and the second lower bracket 13, and the base at the bottom of the lower bracket ensures stable contact with the ground. The lifting screw 10 on the first upper bracket 8 is rotatably connected with the first lower bracket 9 through the bearing seat 11. Turning the hand wheel can drive the lifting screw 10 to rotate. Since the lifting screw 10 is threadedly connected with the first upper bracket 8, the lifting and lowering of the first upper bracket 8 and the workbench 1 can be realized. The guide rod 14 at the bottom of the second upper bracket 12 cooperates with the guide sleeve 16 at the top of the second lower bracket 13, which plays a guiding role in the lifting and lowering process of the workbench 1, ensuring that the workbench 1 rises or falls smoothly.

[0045] In general, the support structure provides stable support for the workbench 1 and the entire sewing machine. The height adjustment function can meet the height requirements of different operators or the requirements of different sewing work scenes for the height of the workbench 1, thereby improving the operator's comfort and sewing efficiency.

[0046] like Figure 3-4 As shown:

[0047] A positioning rack 15 is provided on one side of the outer wall of the guide rod 14, a notch is provided on one side of the guide sleeve 16, the notch is directly opposite to the positioning rack 15, a convex plate 17 is provided outside the notch, a positioning rod 18 is slidably inserted on the convex plate 17, a positioning block 19 is provided at one end of the positioning rod 18, the positioning block 19 and the positioning rack 15 are adapted and locked by a pin rod to position the guide rod 14 to prevent the workbench 1 from falling. A pull rod is provided at the other end of the positioning rod 18, a collar 21 is provided on the outer wall of the convex plate 17, the positioning rod 18 is slidably inserted inside the collar 21, a through hole for the pin rod to pass is provided on the collar 21, and a positioning hole 20 is provided on the positioning rod 18 for inserting the pin rod.

[0048] When in use, the positioning rack 15 on the outer wall of one side of the guide rod 14 cooperates with the positioning rod 18 on the convex plate 17 outside the notch of the guide sleeve 16, and the pull rod is pulled to move the positioning rod 18, and the positioning block 19 is disengaged from the positioning rack 15. At this time, the height of the workbench 1 can be adjusted; after adjusting to the appropriate height, the pull rod is pushed to make the positioning block 19 engage with the positioning rack 15, and then the pin is inserted into the through hole of the ring 21 and the positioning hole 20 on the positioning rod 18 to lock the positioning rod 18, thereby preventing the guide rod 14 from moving and preventing the workbench 1 from falling.

[0049] With this design, after the height of the workbench 1 is adjusted, it is locked to ensure that the height of the workbench 1 is stable during the sewing process, prevent the height change of the workbench 1 due to accidents from affecting the sewing operation, and improve the safety and stability of the use of the sewing machine.

[0050] In addition, the present invention also includes a method for operating a sewing machine having an adjustable presser foot 5 structure, comprising the following steps:

[0051] S1. Preparation: Place the sewing machine in a suitable position and adjust the height of the workbench 1 according to the height of the operator or the requirements of the sewing work;

[0052] S2. Installing fabric: placing the fabric to be sewn on the workbench 1 and adjusting the position;

[0053] S3, adjusting the pressure of the presser foot: rotating the adjusting nut 24 to adjust the pressure of the presser foot 5 according to actual needs, and stopping the rotation of the adjusting nut 24 after adjusting to a suitable pressure;

[0054] S4, start sewing: step on the pedal 6 of the control motor 7 to drive the machine body 2 to work, and the needle bar at the lower end of the machine arm 3 cooperates with the presser foot 5 to sew the cloth. During the sewing process, if it is found that the pressure of the presser foot 5 is not appropriate according to the actual situation, step S3 can be repeated to fine-tune the pressure;

[0055] S5, end of sewing: After finishing sewing, release the pedal 6, stop the motor 7, and take off the sewn fabric.

[0056] In S1, the specific adjustment method is to rotate the handwheel of the lifting screw 10 on the first upper bracket 8, rotate the handwheel clockwise to make the lifting screw 10 rise and the workbench 1 rise; rotate the handwheel counterclockwise to make the lifting screw 10 fall and the workbench 1 lower. After adjusting to the appropriate height, stop rotating the handwheel.

[0057] In S3, during specific adjustments, for thinner fabrics, loosen the adjusting nut 24 to relax the compression spring 25, thereby reducing the pressure on the presser foot 5. At this time, the adjusting screw 23 moves upward in the connecting groove, and the pressure of the presser foot 5 on the fabric is reduced; for thicker fabrics, tighten the adjusting nut 24, the compression spring 25 is compressed, and the pressure on the presser foot 5 is increased. The adjusting screw 23 moves downward in the connecting groove, and the pressure of the presser foot 5 on the fabric is increased.

[0058] During pressure regulation operation:

[0059] 1. Prepare fabrics of different materials and thicknesses, such as tulle, cotton, denim, etc.;

[0060] 2. For gauze fabrics, first rotate the adjusting nut 24 counterclockwise to reduce the compression of the elastic element and the pressure of the presser foot 5; then perform a trial sewing and observe the sewing seams and the conveying of the fabric; if the fabric still wrinkles, continue to fine-tune the adjusting nut 24 until the sewing effect is satisfactory;

[0061] 3. For thicker fabrics such as denim, turn the adjusting nut 24 clockwise to increase the compression of the elastic element and the pressure of the presser foot 5. Perform trial sewing in the same way and further adjust the pressure of the presser foot 5 according to the sewing situation to ensure that the fabric can be smoothly transported and the stitches are even.

[0062] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sewing machine with an adjustable presser foot structure, characterized in that: include: A workbench (1) and a machine body (2); The machine body (2) is mounted on a workbench (1); a motor (7) for driving the machine body (2) to operate and a pedal (6) for controlling the motor (7) are provided at the bottom of the machine body (2); a machine arm (3) for operating is provided on the top of the machine body (2); a presser foot (5) is connected to the lower end of the machine arm (3) via a connecting arm (4); and a needle bar adapted to the presser foot (5) is provided at the lower end of the machine arm (3); It also includes an adjustment mechanism for adjusting the pressure of the presser foot (5) on the fabric; The adjusting mechanism comprises a protrusion (22) arranged on the machine arm (3) and an adjusting screw (23) arranged on the presser foot (5); a hole for the adjusting screw (23) to pass through is opened on the protrusion (22); the adjusting screw (23) is inserted into the hole; and an adjusting nut (24) is threadedly mounted on the adjusting screw (23) at the top of the protrusion (22); a compression spring (25) is slidably sleeved on the adjusting screw (23); the upper end of the compression spring (25) abuts against the bottom of the protrusion (22); and the lower end of the compression spring (25) abuts against the surface of the presser foot (5); a connecting groove for connecting with the connecting arm (4) is provided on the presser foot (5); and a sliding rod is provided at the lower end of the connecting arm (4); and the sliding rod can move up and down in the connecting groove.

2. A sewing machine with an adjustable presser foot structure according to claim 1, characterized in that: A support structure for supporting equipment is provided at the bottom of the workbench (1), the support structure comprising a first upper bracket (8) and a second upper bracket (12) provided on both sides of the bottom of the workbench (1), and a first lower bracket (9) located at the bottom of the first upper bracket (8) and a second lower bracket (13) located at the bottom of the second upper bracket (12), and bases are provided at the bottoms of the first bracket and the second lower bracket (13).

3. A sewing machine with an adjustable presser foot structure according to claim 2, characterized in that: A lifting screw (10) is threadedly mounted on the first upper bracket (8) for adjusting the height of the workbench (1); the lower part of the lifting screw (10) and the top of the first lower bracket (9) are rotatably connected together, and a hand wheel is arranged at the lower end of the lifting screw (10).

4. A sewing machine with an adjustable presser foot structure according to claim 3, characterized in that: A bearing seat (11) is provided on the first lower bracket (9), and the lower portion of the lifting screw (10) is plugged and fixed to the inner ring of the bearing of the bearing seat (11).

5. A sewing machine with an adjustable presser foot structure according to claim 2, characterized in that: A guide rod (14) is provided at the bottom of the second upper bracket (12), a guide sleeve (16) is provided at the top of the second lower bracket (13), and the guide rod (14) is slidably inserted into the interior of the guide sleeve (16).

6. A sewing machine with an adjustable presser foot structure according to claim 5, characterized in that: A positioning rack (15) is provided on one side outer wall of the guide rod (14); a notch is provided on one side of the guide sleeve (16), the notch facing the positioning rack (15); a convex plate (17) is provided outside the notch; a positioning rod (18) is slidably inserted on the convex plate (17); a positioning block (19) is provided at one end of the positioning rod (18); the positioning block (19) and the positioning rack (15) are adapted and locked by a pin rod to position the guide rod (14) to prevent the workbench (1) from falling.

7. A sewing machine with an adjustable presser foot structure according to claim 6, characterized in that: A pull rod is provided at the other end of the positioning rod (18), a sleeve ring (21) is provided on the outer wall of the convex plate (17), the positioning rod (18) is slidably inserted into the sleeve ring (21), a through hole for a pin rod to pass through is provided on the sleeve ring (21), and a positioning hole (20) is provided on the positioning rod (18) for inserting the pin rod.

8. The sewing machine with an adjustable presser foot structure according to any one of claims 1 to 7, further comprising an operating method of the sewing machine with an adjustable presser foot structure, characterized in that: The following steps are involved: S1. Preparation: Place the sewing machine in a suitable position and adjust the height of the workbench (1) according to the height of the operator or the requirements of the sewing work; S2. Installing fabric: placing the fabric to be sewn on the workbench (1) and adjusting the position; S3, adjusting the pressure of the presser foot: rotating the adjusting nut (24) to adjust the pressure of the presser foot (5) according to actual needs, and stopping the rotation of the adjusting nut (24) after adjusting to a suitable pressure; S4, start sewing: step on the pedal (6) of the control motor (7) to drive the machine body (2) to operate, and the needle bar at the lower end of the machine arm (3) cooperates with the presser foot (5) to sew the fabric. During the sewing process, if it is found that the pressure of the presser foot (5) is not appropriate according to the actual situation, step S3 can be repeated to fine-tune the pressure; S5, end of sewing: After sewing is completed, the pedal (6) is released, the motor (7) is stopped, and the sewn fabric is removed.

9. The method for operating a sewing machine with an adjustable presser foot structure according to claim 8, characterized in that: In S1, the specific adjustment method is to rotate the hand wheel of the lifting screw (10) on the first upper bracket (8); rotating the hand wheel clockwise causes the lifting screw (10) to rise, thereby raising the workbench (1); rotating the hand wheel counterclockwise causes the lifting screw (10) to descend, thereby lowering the workbench (1); and after adjusting to a suitable height, stop rotating the hand wheel.

10. The method for operating a sewing machine with an adjustable presser foot structure according to claim 8, characterized in that: In the above-mentioned S3, when making specific adjustments, for thinner fabrics, the adjusting nut (24) is loosened to relax the compression spring (25), thereby reducing the pressure on the presser foot (5). At this time, the adjusting screw (23) moves upward in the connecting groove, and the pressure of the presser foot (5) on the fabric is reduced. For thicker fabrics, the adjusting nut (24) is tightened, the compression spring (25) is compressed, and the pressure on the presser foot (5) is increased. The adjusting screw (23) moves downward in the connecting groove, and the pressure of the presser foot (5) on the fabric is increased.

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