Presser foot device for a sewing machine

Abstract

This technical solution belongs to the field of sewing machine technology, specifically relating to a presser foot device for a sewing machine, including a machine head housing; a presser foot mechanism slidably mounted on the machine head housing for pressing the fabric; and a pressure adjusting mechanism mounted on the machine head housing and connected to the presser foot mechanism. The pressure adjusting mechanism includes: a pressure adjusting drive component mounted on the machine head housing; a pressure adjusting crank rotatably mounted on the machine head housing, with one end of the crank connected to the drive end of the pressure adjusting drive component; and a lower spring mounted between the presser foot mechanism and the other end of the pressure adjusting crank. The pressure of the presser foot mechanism on the fabric is adjusted by regulating the extension and contraction of the lower spring through the pressure adjusting drive component. This allows the pressure of the presser foot mechanism to change accordingly when dealing with fabrics of different thicknesses. The combination of mechanical transmission and digital adjustment improves the accuracy of pressure regulation. Simultaneously, it simplifies the tedious process of manually adjusting the presser foot mechanism pressure, saving time and effort and improving production efficiency.

Description

Technical Field

[0001] This technical solution relates to the field of sewing machine technology, and specifically refers to a presser foot device for a sewing machine. Background Technology

[0002] A sewing machine is a device that uses a presser foot to press down the fabric, a needle to pierce the fabric, and a rotary hook to create stitches, thus sewing together fabric and other materials.

[0003] For example, Chinese patent CN201620259911.0 discloses a presser foot lifting device for a sewing machine, which has a spring at one end of the presser bar and an adjusting screw at the upper end of the spring. The spring squeezes the presser bar, so that the presser foot presses the fabric. At the same time, the pressure of the presser foot can be increased or decreased by rotating the adjusting screw.

[0004] However, it still has some shortcomings:

[0005] 1. When the fabric thickness changes, the existing presser foot mechanism is difficult to achieve precise adaptive adjustment: if the fabric is thicker, the spring compression increases, resulting in excessive presser foot pressure that makes it difficult for the fabric to move; if the fabric is thinner, the spring elasticity is insufficient and cannot effectively press the fabric. Therefore, it is necessary to manually turn the pressure adjusting screw to adjust the position of the pressure bar, thereby changing the presser foot pressure. This adjustment method lacks a digital control mechanism, has a low degree of mechanization, and requires repeated manual adjustments to ensure pressure accuracy. Not only is the operation process cumbersome, but the adjustment accuracy is also limited, affecting the smoothness of fabric feeding and reducing the ease of use.

[0006] 2. The existing pressure adjusting screw can only adjust the presser foot pressure when the machine is stopped, and cannot adapt to fabrics of different thicknesses during operation, resulting in poor flexibility. In addition, during sewing, the electronic thread clamp and presser foot clamp the sewing thread located on both sides of the needle, keeping both ends of the thread in a restrained state. When the rotary hook catches the thread, the thread is easily pulled and broken, resulting in frequent thread breakage and the need for repeated re-catching, which affects sewing efficiency and user experience.

[0007] 3. In existing sewing machines, during the process of lowering the presser foot after it is raised, in order to ensure the falling speed, the presser foot relies on the spring force to fall freely and hit the needle plate. The noise level depends on the presser foot pressure adjusted by the pressure adjusting screw: when the pressure is greater, the spring deformation increases, and the rebound force applied to the presser bar is strengthened, causing the presser foot to fall faster and collide with the needle plate. This not only generates noise and affects the user experience, but may also accelerate the wear of the needle plate and presser foot, or even cause damage to the parts. Utility Model Content

[0008] The purpose of this technical solution is to provide a presser foot device for a sewing machine, which drives the pressure adjusting crank to rotate through a pressure adjusting drive component, thereby adjusting the deformation of the lower spring and thus changing the pressure of the presser foot mechanism on the fabric. This improves the problem of inconvenient operation and low adjustment accuracy caused by the need to manually turn the adjusting screw to change the presser foot pressure in existing sewing machine presser foot mechanisms.

[0009] The purpose of this technical solution is achieved as follows:

[0010] A presser foot device for a sewing machine, comprising:

[0011] Head housing;

[0012] A presser foot mechanism, which is slidably mounted on the machine head housing, is used to press the fabric.

[0013] A pressure adjustment mechanism, which is installed on the machine head housing and connected to the presser foot mechanism, is used to adjust the pressure of the presser foot mechanism on the fabric;

[0014] The pressure regulating mechanism includes:

[0015] A pressure regulating drive component is mounted on the head housing;

[0016] A pressure regulating crank is rotatably mounted on the machine head housing, and one end of the pressure regulating crank is connected to the drive end of the pressure regulating drive component.

[0017] A lower spring is installed between the pressure foot mechanism and the other end of the pressure adjusting crank;

[0018] The pressure regulating crank is driven to rotate by the pressure regulating drive component, and the pressure regulating crank causes the lower spring to undergo elastic deformation, thereby adjusting the pressure of the presser foot mechanism on the fabric.

[0019] Preferably, the pressure regulating mechanism further includes:

[0020] A guide rod is mounted on the head housing and located above the presser foot mechanism, and the lower spring is sleeved on the guide rod;

[0021] A slide block is slidably mounted on the guide rod and movably abuts against the upper end of the lower spring, and a sliding groove is provided on the slide block;

[0022] A slider is movably connected to the end of the voltage regulating crank, and the slider is slidably disposed within the groove.

[0023] Preferably, an upper spring is sleeved on the guide rod, the upper end of the upper spring abutting against the machine head housing, and the lower end of the upper spring abutting against the slide block.

[0024] Preferably, a sliding block is provided on the side end of the slide block, and a sliding groove is provided inside the machine head housing, and the sliding block is slidably placed in the sliding groove.

[0025] Preferably, the pressure regulating crank has a sector gear section, a rotating section, and a driving section; the driving end of the pressure regulating drive is provided with a gear, which meshes with the sector gear section, and the rotating section is hinged to the head housing; the driving section is movably connected to the slider.

[0026] Preferably, an adjusting component is threadedly connected to the head housing, the adjusting component is connected to the guide rod, and the upper end of the upper spring abuts against the adjusting component;

[0027] The compression of the upper spring can be adjusted by adjusting the position of the adjusting element on the machine head housing.

[0028] Preferably, the adjusting member is provided with a limiting groove, and the upper end of the upper spring is placed in the limiting groove and abuts against the bottom of the limiting groove.

[0029] Preferably, the presser foot mechanism includes:

[0030] The pressure bar is slidably mounted on the head housing;

[0031] A presser foot, which is installed at the lower end of the presser bar, is used to press the fabric.

[0032] Preferably, it further includes: a lifting mechanism, which is mounted on the head housing, for driving the presser foot mechanism to move upward within the head housing;

[0033] The lifting mechanism includes:

[0034] A lifting drive component is mounted on the machine head housing, and a cam is connected to the drive end of the lifting drive component;

[0035] A crossbar, the front end of which is hinged to the head housing, and the middle part of the crossbar movably abuts against the cam;

[0036] A push rod is vertically mounted on the machine head housing, and the lower end of the push rod is hinged to the rear end of the crossbar;

[0037] The rear crank is hinged to the head housing, and the rear end of the rear crank is hinged to the upper end of the push rod;

[0038] A connecting rod is laterally disposed on the head housing, and the rear end of the connecting rod is hinged to the front end of the rear crank.

[0039] A front crank, which is hinged to the head housing, and the rear end of the front crank is hinged to the front end of the connecting rod;

[0040] A lifting seat is mounted on the pressure bar of the presser foot mechanism, and the lifting seat has a lifting block that movably abuts against the front end of the front crank.

[0041] Preferably, the lifting block is threadedly connected to an adjusting member, and the front end of the front crank has a lifting protrusion that movably abuts against the adjusting member.

[0042] The key and beneficial technical effects of this technical solution compared to existing technologies are:

[0043] 1. This technical solution adjusts the extension and contraction of the lower spring by adjusting the pressure drive component, thereby adjusting the pressure of the presser foot mechanism on the fabric. This allows the pressure of the presser foot mechanism to change accordingly when dealing with fabrics of different thicknesses. The combination of mechanical transmission and digital adjustment improves the accuracy of pressure regulation. At the same time, it simplifies the tedious process of manually adjusting the pressure of the presser foot mechanism, saving time and effort and improving production efficiency.

[0044] 2. This technical solution enables dynamic real-time adjustment of the presser foot mechanism pressure through a pressure adjustment mechanism. The pressure adjustment drive can adjust the presser foot mechanism pressure while the machine is running, so that the presser foot mechanism pressure does not need to be adjusted after the thickness of the sewing fabric changes, thus improving production efficiency and flexibility. At the same time, when the rotary hook is hooking the thread, the pressure on the sewing thread on the fabric is adjusted in real time by adjusting the presser foot mechanism pressure, which prevents the thread from breaking due to excessive pulling and ensures sewing efficiency and smooth operation.

[0045] 3. This technical solution can adjust the pressure of the presser foot mechanism through a pressure adjustment mechanism, ensuring that the presser foot is lowered quickly while avoiding excessive collision between it and the needle plate, reducing noise and improving the comfort of using the equipment; in addition, this design can also reduce the wear caused by the collision between the needle plate and the presser foot, and extend the service life of the components.

[0046] 4. This technical solution uses an upper spring to position the slide between the upper and lower springs. When the pressure regulating drive compresses the lower spring to increase the pressure of the presser foot mechanism, the upper spring can apply pressure to the slide, offsetting part of the reaction force of the lower spring on the slide. This reduces the driving force required for the pressure regulating drive to maintain the compressed state of the lower spring, reduces the drive load, and improves the operational stability of the pressure regulating mechanism. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of this technical solution.

[0048] Figure 2 This is a schematic diagram of the structure of the head housing of this technical solution when it is not installed.

[0049] Figure 3This is a schematic diagram of the structure of the presser foot mechanism and pressure regulating mechanism of this technical solution installed on the machine head housing.

[0050] Figure 4 This is a schematic diagram of the presser foot mechanism and pressure adjustment mechanism in this technical solution.

[0051] Figure 5 This is a cross-sectional view of the presser foot mechanism and pressure adjustment mechanism of this technical solution.

[0052] Figure 6 This is an exploded view of the presser foot mechanism and pressure regulating mechanism of this technical solution.

[0053] Figure 7 This is a schematic diagram of the lifting mechanism in this technical solution.

[0054] Figure 8 This is a schematic diagram of the front crank and lifting seat of this technical solution.

[0055] Figure 9 This is a structural diagram of the lifting drive component, crossbar, and top bar of this technical solution.

[0056] Reference numerals: 1. Machine head housing; 11. Sliding groove one; 12. Worktable; 13. Clearance opening; 14. Guide sleeve; 15. Sliding groove two;

[0057] 2. Presser foot mechanism; 21. Presser rod; 22. Presser foot;

[0058] 3. Pressure regulating mechanism; 31. Pressure regulating drive component; 311. Gear; 32. Pressure regulating crank; 321. Sector gear section; 322. Rotating part; 323. Drive part; 324. Hinge pin one; 33. Lower spring; 34. Guide rod; 341. Fixing groove; 35. Slide block; 351. Slide groove; 352. Sliding block; 36. Sliding block; 361. Hinge pin two; 37. Upper spring;

[0059] 4. Adjusting component; 41. Limiting groove; 42. Mounting hole; 43. Fixing pin;

[0060] 5. Lifting mechanism; 51. Lifting drive component; 52. Cam; 53. Crossbar; 531. Rotating wheel; 54. Push rod; 55. Rear crank; 56. Connecting rod; 57. Front crank; 571. Lifting protrusion; 58. Lifting seat; 581. Lifting block; 582. Adjusting component. Detailed Implementation

[0061] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings. See also Figures 1-9 .

[0062] Combination Figure 1 and Figure 2A presser foot device for a sewing machine, comprising:

[0063] The head housing 1 is the outer shell of the sewing machine head, and the head housing 1 includes a worktable 12 for placing fabric.

[0064] The presser foot mechanism 2 is slidably mounted on the machine head housing 1. The presser foot mechanism 2 can move up and down on the machine head housing 1. The presser foot mechanism 2 is used to press the fabric located on the worktable 12.

[0065] The pressure adjustment mechanism 3 is installed on the machine head housing 1 and connected to the presser foot mechanism 2. The pressure adjustment mechanism 3 is used to adjust the force of the presser foot mechanism 2 in pressing the fabric, that is, to adjust the pressure of the presser foot mechanism 2.

[0066] Combination Figure 3 and Figure 4 The pressure regulating mechanism 3 includes:

[0067] The voltage regulating drive 31 is a stepper motor or a servo motor, preferably a stepper motor, and is mounted on the outer side wall of the head housing 1.

[0068] The pressure regulating crank 32 is rotatably mounted on the head housing 1 via a hinge pin 324, and the rear end of the pressure regulating crank 32 is connected to the drive end of the pressure regulating drive 31.

[0069] The lower spring 33 is installed between the front end of the presser foot mechanism 2 and the pressure adjusting crank 32, that is, the two ends of the lower spring 33 are respectively connected to the upper end of the presser foot mechanism 2 and the end of the pressure adjusting crank 32.

[0070] The pressure regulating crank 32 is driven to rotate by the pressure regulating drive 31. The rotation of the pressure regulating crank 32 adjusts the compression of the lower spring 33, thereby changing the degree of elastic deformation of the lower spring 33, and thus adjusting the pressure of the lower spring 33 on the presser foot mechanism 2, thereby adjusting the pressure of the presser foot mechanism 2 on the fabric.

[0071] Combination Figure 1 and Figure 3 The head housing 1 is provided with a clearance opening 13, which connects the inside of the head housing 1 with the outside. The middle part of the pressure regulating crank 32 is hinged to the side wall of the clearance opening 13 by a hinge pin 324. The rear end of the pressure regulating crank 32 extends out of the head housing 1 and is connected to the pressure regulating drive component 31. The front end of the pressure regulating crank 32 is placed inside the head housing 1 and is directly or indirectly connected to the lower spring 33.

[0072] Combination Figures 2-5 The pressure regulating mechanism 3 also includes:

[0073] The guide rod 34 is mounted on the machine head housing 1 and located above the presser foot mechanism 2 at its upper end, and the lower spring 33 is sleeved on the guide rod 34;

[0074] The slide block 35 is slidably sleeved on the guide rod 34 and movably abuts against the upper end of the lower spring 33. That is, the upper and lower ends of the lower spring 33 movably abut against the lower end of the slide block 35 and the upper end of the presser foot mechanism 2, respectively, and the slide block 35 is provided with a slide groove 351.

[0075] The slider 36 is movably connected to the end of the voltage regulating crank 32 via a hinge pin 361, and the slider 36 is slidably disposed in the slide groove 351.

[0076] When the pressure regulating crank 32 rotates, the pressure regulating crank 32 drives the slider 36 to slide in the slide groove 351 and abut against the side wall of the slide groove 351, so that the slide 35 slides on the guide rod 34, thereby causing the slide 35 to squeeze or release the lower spring 33, thereby changing the deformation of the lower spring 33, thereby adjusting the pressure applied by the lower spring 33 to the presser foot mechanism 2, and thus changing the pressure of the presser foot mechanism 2.

[0077] Specifically, when the front end of the adjusting crank 32 moves upward, the pressure on the lower spring 33 decreases, the lower spring 33 extends, and the pressure on the presser foot mechanism 2 decreases; when the front end of the adjusting crank 32 moves downward, the pressure on the lower spring 33 increases, the lower spring 33 increases the pressure on the presser foot mechanism 2, thereby increasing the pressure of the presser foot mechanism 2.

[0078] The pressure regulating drive component 31 adjusts the extension and contraction deformation of the lower spring 33, thereby adjusting the pressure of the presser foot mechanism 2 on the fabric. This allows the pressure of the presser foot mechanism 2 to change with the thickness of the fabric when facing different thicknesses. The combination of mechanical transmission and digital adjustment improves the accuracy of pressure regulation. At the same time, it simplifies the tedious process of manually adjusting the pressure of the presser foot mechanism 2, saving time and effort and improving production efficiency.

[0079] Furthermore, the pressure regulating mechanism 3 can dynamically adjust the pressure of the presser foot mechanism 2 in real time. The pressure regulating drive 31 can adjust the pressure of the presser foot mechanism 2 while the machine is running, so that the machine does not need to be stopped to adjust the pressure of the presser foot mechanism 2 after the thickness of the sewing fabric changes, thus improving production efficiency and flexibility. At the same time, when the rotary hook is hooking the thread, the pressure on the sewing thread on the fabric is adjusted by adjusting the pressure of the presser foot mechanism 2 in real time. The pressure regulating crank 32 is rotated to move the slide 35 upward to reduce the pressure on the lower spring 33, thereby reducing the pressure of the presser foot mechanism 2 on the sewing thread, preventing the thread from breaking due to excessive pulling, and ensuring sewing efficiency and smooth operation.

[0080] The pressure of the presser foot mechanism 2 is adjusted by a pressure regulating drive 31. This drive 31, in conjunction with the height adjustment function of the presser foot mechanism 2 in the sewing machine control system, can adaptively increase or decrease the pressure. For example, as the presser foot mechanism 2 moves down towards the needle plate on the worktable 12, it maintains a set pressure value one. Then, when the distance between the presser foot mechanism 2 and the needle plate reaches a set distance, the pressure regulating drive 31 causes the pressure of the presser foot mechanism 2 to reach a set pressure value two. The change from pressure value one to value two is then automatically adjusted by the pressure regulating drive 31, achieving automated pressure adjustment of the presser foot mechanism 2.

[0081] The pressure adjustment mechanism 3 can adjust the pressure of the presser foot mechanism 2, ensuring that the presser foot 22 is lowered quickly while avoiding excessive collision between it and the needle plate, reducing noise and improving the comfort of using the equipment; in addition, this design can also reduce the wear caused by the collision between the needle plate and the presser foot 22, and extend the service life of the components.

[0082] Combination Figures 4-6 An upper spring 37 is fitted on the guide rod 34. The upper end of the upper spring 37 abuts against the inner wall of the upper side of the machine head housing 1, and the lower end of the upper spring 37 abuts against the slide block 35.

[0083] By setting the upper spring 37, the slide 35 is positioned between the upper spring 37 and the lower spring 33. When the pressure regulating drive 31 compresses the lower spring 33 to increase the pressure of the pressure foot mechanism 2, the upper spring 37 can apply pressure to the slide 35, offsetting part of the reaction force applied by the lower spring 33 to the slide 35. This reduces the driving force required by the pressure regulating drive 31 to maintain the compressed state of the lower spring 33, reduces the driving load of the pressure regulating drive 31, and improves the operational stability of the pressure regulating mechanism 3.

[0084] Combination Figure 1 and Figure 6 A sliding block 352 is provided on the side end of the slide block 35, and a sliding groove 11 is provided on the inner wall of the machine head housing 1. The sliding block 352 is slidably placed in the sliding groove 11. The cooperation between the sliding block 352 and the sliding groove 11 is used to ensure the stability of the slide block 35 when it moves up and down in the machine head housing 1.

[0085] Combination Figure 4 and Figure 6The pressure regulating crank 32 has a sector gear section 321, a rotating section 322, and a driving section 323. The driving end of the pressure regulating drive member 31 is provided with a gear 311, which meshes with the sector gear section 321. When the pressure regulating drive member 31 drives the gear 311 to rotate, the gear 311 drives the sector gear section 321 to move, so that the pressure regulating crank 32 rotates or swings around the hinge pin 324. The middle part of the pressure regulating crank 32 is the rotating section 322, which is hinged to the head housing 1 by the hinge pin 324. The driving section 323 and the slider 36 are movably connected by the hinge pin 361.

[0086] Combination Figures 3-6 The upper end of the machine head housing 1 is threaded with an adjusting component 4, which is connected to the upper half of the guide rod 34. The upper end of the upper spring 37 abuts against the lower end of the adjusting component 4.

[0087] By adjusting the installation position of the adjusting component 4 on the head housing 1, the compression of the upper spring 37 can be adjusted, thereby adjusting the force exerted by the upper spring 37 on the slide 35.

[0088] When the pressure regulating drive 31 is not working, the pressure regulating crank 32 is in a relaxed state. The design of the adjusting component 4 enables this technical solution to have the function of manually adjusting the pressure of the presser foot mechanism 2 in the prior art, thereby improving the versatility of functions and meeting different usage needs.

[0089] Combination Figure 5 and Figure 6 The adjusting component 4 is provided with a limiting groove 41, and the upper end of the upper spring 37 is placed in the limiting groove 41 and abuts against the bottom of the limiting groove 41.

[0090] The adjusting component 4 is provided with a mounting hole 42, which is connected to the bottom of the limiting groove 41. The diameter of the mounting hole 42 is smaller than the diameter of the upper spring 37, ensuring that the upper spring 37 abuts against the bottom of the limiting groove 41. A fixing pin 43 is installed on the side wall of the mounting hole 42. The upper end of the guide rod 34 passes through the limiting groove 41 and is placed in the mounting hole 42. The end of the fixing pin 43 is inserted into the fixing groove 341 on the side wall of the guide rod 34, so that the adjusting component 4 is connected to the upper end of the guide rod 34.

[0091] Presser foot mechanism 2 includes:

[0092] The pressure rod 21 has at least a hollow upper half. The pressure rod 21 is slidably mounted on the guide sleeve 14 of the head housing 1. The upper end of the pressure rod 21 is in movable contact with the lower end of the lower spring 33, and the lower end of the guide rod 34 can be movably inserted into the upper half of the pressure rod 21.

[0093] Presser foot 22, located at the lower end of presser bar 21, is used to press the fabric.

[0094] Combination Figures 7-9The technical solution also includes: a lifting mechanism 5, which is installed on the head housing 1. The lifting mechanism 5 is used to drive the presser foot mechanism 2 to move upward inside the head housing 1, thereby enabling the presser foot mechanism 2 to release the fabric.

[0095] Lifting mechanism 5 includes:

[0096] The lifting drive component 51 is a motor or a rotary cylinder, preferably a stepper motor, which is mounted on the machine head housing 1, and a cam 52 is connected to the drive end of the lifting drive component 51.

[0097] The crossbar 53 has its front end hinged to the machine head housing 1, and a rotating wheel 531 is hinged to the middle of the crossbar 53. The rotating wheel 531 is in movable contact with the cam 52.

[0098] The push rod 54 is vertically mounted on the head housing 1, and the lower end of the push rod 54 is hinged to the rear end of the crossbar 53;

[0099] The rear crank 55 is hinged in the middle to the head housing 1, and the rear end of the rear crank 55 is hinged to the upper end of the push rod 54.

[0100] The connecting rod 56 is horizontally disposed on the head housing 1, and the rear end of the connecting rod 56 is hinged to the front end of the rear crank 55.

[0101] The front crank 57 is hinged to the head housing 1, and the rear end of the front crank 57 is hinged to the front end of the connecting rod 56.

[0102] The lifting seat 58 is mounted on the pressure rod 21 of the pressure foot mechanism 2, and the lifting seat 58 has a lifting block 581, which movably abuts against the front end of the front crank 57.

[0103] When the lifting drive 51 drives the cam 52 to rotate, the crossbar 53 causes the push rod 54 to move upward. The push rod 54 causes the connecting rod 56 to move backward through the rear crank 55. The connecting rod 56 pulls the front crank 57 to lift the lifting seat 58. The lifting seat 58 drives the pressure rod 21 to move upward, thereby enabling the presser foot 22 to release the fabric.

[0104] like Figure 8 As shown, the lifting block 581 is threaded with an adjusting component 582, which is a screw or bolt. The front end of the front crank 57 has a lifting protrusion 571, which moves against the lower end of the adjusting component 582 to drive the lifting seat 58 to move upward.

[0105] A sliding groove 2 15 is provided on the inner side wall of the machine head housing 1. The front end of the lifting protrusion 571 is slidably placed in the sliding groove 2 15 to ensure the stability of the lifting seat 58 when it moves up and down.

[0106] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

[0107] It should be noted that the structures, proportions, and sizes depicted in the accompanying drawings are solely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation of this technical solution and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this technical solution, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms used in this specification, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity and not intended to limit the scope of implementation of this technical solution. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the technical solution's implementation.

[0108] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0109] Furthermore, the use of terms such as "first" and "second" in this application is 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

Claims

1. A presser foot device for a sewing machine, characterized in that, include: Head housing (1); A presser foot mechanism (2) is slidably mounted on the head housing (1) for pressing the fabric; A pressure adjustment mechanism (3) is installed on the head housing (1) and connected to the presser foot mechanism (2) for adjusting the pressure of the presser foot mechanism (2) on the fabric; The pressure regulating mechanism (3) includes: A pressure regulating drive (31) is mounted on the head housing (1); A pressure regulating crank (32) is rotatably mounted on the head housing (1), and one end of the pressure regulating crank (32) is connected to the drive end of the pressure regulating drive (31). A lower spring (33) is installed between the pressure foot mechanism (2) and the other end of the pressure adjusting crank (32); The pressure regulating crank (32) is driven to rotate by the pressure regulating drive (31), and the pressure regulating crank (32) causes the lower spring (33) to undergo elastic deformation, thereby adjusting the pressure of the presser foot mechanism (2) to press the fabric.

2. The presser foot device for a sewing machine according to claim 1, characterized in that: The pressure regulating mechanism (3) further includes: A guide rod (34) is mounted on the head housing (1) and located above the presser foot mechanism (2), and a lower spring (33) is sleeved on the guide rod (34); A slide block (35) is slidably disposed on the guide rod (34) and movably abuts against the upper end of the lower spring (33), and a slide groove (351) is provided on the slide block (35); A slider (36) is movably connected to the end of the voltage regulating crank (32), and the slider (36) is slidably disposed in the groove (351).

3. The presser foot device for a sewing machine according to claim 2, characterized in that: An upper spring (37) is sleeved on the guide rod (34). The upper end of the upper spring (37) abuts against the machine head housing (1), and the lower end of the upper spring (37) abuts against the slide (35).

4. A presser foot device for a sewing machine according to claim 2 or 3, characterized in that: The slide block (35) is provided with a sliding block (352) on its side end, and a sliding groove (11) is provided inside the head housing (1). The sliding block (352) is slidably placed in the sliding groove (11).

5. A presser foot device for a sewing machine according to claim 2 or 3, characterized in that: The pressure regulating crank (32) has a sector gear section (321), a rotating section (322) and a driving section (323); the driving end of the pressure regulating drive (31) is provided with a gear (311), the gear (311) meshes with the sector gear section (321), the rotating section (322) is hinged to the head housing (1); the driving section (323) is movably connected to the slider (36).

6. The presser foot device for a sewing machine according to claim 3, characterized in that: An adjusting component (4) is threaded onto the head housing (1). The adjusting component (4) is connected to the guide rod (34). The upper end of the upper spring (37) abuts against the adjusting component (4). The compression of the upper spring (37) can be adjusted by adjusting the position of the adjusting member (4) on the head housing (1).

7. The presser foot device for a sewing machine according to claim 6, characterized in that: The adjusting member (4) is provided with a limiting groove (41), and the upper end of the upper spring (37) is placed in the limiting groove (41) and abuts against the bottom of the limiting groove (41).

8. The presser foot device for a sewing machine according to claim 1, characterized in that: The presser foot mechanism (2) includes: Pressure bar (21), which is slidably mounted on the head housing (1); A presser foot (22) is installed at the lower end of the presser bar (21) and is used to press the fabric.

9. The presser foot device of a sewing machine according to claim 1 or 8, wherein Also includes: A lifting mechanism (5) is mounted on the head housing (1) and is used to drive the presser foot mechanism (2) to move upward within the head housing (1); The lifting mechanism (5) includes: A lifting drive (51) is mounted on the head housing (1), and a cam (52) is connected to the drive end of the lifting drive (51); A crossbar (53) is hinged at its front end to the head housing (1), and the middle part of the crossbar (53) is in movable contact with the cam (52); A top rod (54) is vertically mounted on the head housing (1), and the lower end of the top rod (54) is hinged to the rear end of the crossbar (53); The rear crank (55) is hinged to the head housing (1), and the rear end of the rear crank (55) is hinged to the upper end of the push rod (54); A connecting rod (56) is laterally disposed on the head housing (1), and the rear end of the connecting rod (56) is hinged to the front end of the rear crank (55); A front crank (57) is hinged to the head housing (1), and the rear end of the front crank (57) is hinged to the front end of the connecting rod (56). A lifting seat (58) is mounted on the pressure bar (21) of the pressure foot mechanism (2), and the lifting seat (58) has a lifting block (581) that movably abuts against the front end of the front crank (57).

10. The presser foot device for a sewing machine according to claim 9, characterized in that: The lifting block (581) is threaded with an adjusting member (582), and the front end of the front crank (57) has a lifting protrusion (571), which movably abuts against the adjusting member (582).

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