Sewing machine presser foot adjustment device and sewing machine

Abstract

This utility model discloses a sewing machine presser foot adjustment device and a sewing machine. The sewing machine includes a presser foot, a rotatably mounted upper shaft, an eccentric wheel fixedly on the upper shaft, and a swing member sleeved on the outside of the eccentric wheel and rotatable around the eccentric wheel. The swing member is linked to the presser foot. The presser foot adjustment device includes a mounting frame, a drive wheel and a transmission shaft rotatably connected to the mounting frame, a drive member fixedly connected to the transmission shaft and abutting against the drive wheel, a first adjustment member rotatably connected to the swing member, and a second adjustment member rotatably connected to the mounting frame and the first adjustment member respectively. The presser foot adjustment device also includes a linkage member connected between the transmission shaft and the second adjustment member to drive the second adjustment member to rotate relative to the mounting frame when the transmission shaft rotates. The presser foot adjustment device has a modular design, which facilitates installation and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a sewing machine presser foot adjustment device and a sewing machine having the same. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to create one or more stitches on fabric, weaving or sewing together one or more layers of fabric. During operation, the presser foot moves back and forth in the up-and-down direction to press the fabric firmly. When sewing fabrics of varying elasticity and thickness, the required range of motion for the presser foot differs, necessitating an adjustment mechanism to regulate its movement. In existing technologies, the adjustment mechanism typically consists of numerous parts. When assembling these parts into the sewing machine body, workers must manage the complex connections between them and the machine body, while also addressing interference between components. This assembly process is quite difficult, impacting production efficiency and quality, and making repairs challenging when the mechanism malfunctions. Furthermore, the complex operating principles of most adjustment mechanisms cause significant inconvenience for users. Utility Model Content

[0003] The purpose of this invention is to provide a new sewing machine presser foot adjustment device.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a sewing machine presser foot adjustment device, the sewing machine including a rotatable upper shaft, an eccentric wheel eccentrically fixed on the upper shaft, a swinging member sleeved on the outside of the eccentric wheel and rotatable around the eccentric wheel, the sewing machine also including a presser foot, a linkage mechanism provided between the swinging member and the presser foot to drive the presser foot to move when the swinging member moves; the presser foot adjustment device includes:

[0005] Mounting bracket,

[0006] A drive wheel is rotatably connected to the mounting bracket about a first axis of rotation. The drive wheel has a drive surface on its circumference. The vertical distance between the drive surface and the first axis of rotation gradually increases along the direction of rotation about the first axis of rotation.

[0007] A transmission assembly includes a transmission shaft and a drive component, wherein the transmission shaft is rotatably connected to the mounting bracket, the drive component is fixedly connected to the transmission shaft, and the drive component has a contact portion that abuts against the drive surface;

[0008] The first adjusting component is rotatably connected to the swing component about the second axis of rotation;

[0009] The second adjusting member is rotatably connected to the mounting bracket about the third rotating axis, and the second adjusting member is rotatably connected to the first adjusting member about the fourth rotating axis. The second rotating axis, the third rotating axis, the fourth rotating axis and the upper shaft are parallel to each other.

[0010] A linkage component is connected between the drive shaft and the second adjusting component to drive the second adjusting component to rotate relative to the mounting bracket when the drive shaft rotates.

[0011] In some embodiments, the drive shaft is parallel to the upper shaft, and the linkage includes a first link, a second link, and a third link. One end of the first link is fixedly connected to the drive shaft, and one end of the third link is connected to the second adjusting member. The second link is rotatably connected to the first link about a fifth rotation axis, and the second link is rotatably connected to the third link about a sixth rotation axis. The fifth rotation axis and the sixth rotation axis are parallel to each other and are parallel to the drive shaft.

[0012] In some embodiments, the second adjusting member has a limiting portion; the presser foot adjusting device includes a retaining mechanism for maintaining stability, the retaining mechanism including a pushing member and an elastic member, the pushing member being movably disposed on the mounting bracket, the pushing member having a pushing portion that abuts against the limiting portion; the elastic member providing the force required to drive the pushing portion toward the limiting portion.

[0013] In some embodiments, the movement path of the pusher is deviated from and perpendicular to the third axis of rotation.

[0014] In some embodiments, the driving surface has a limit end, and the vertical distance between the limit end and the first rotating axis is minimized; when the abutment portion abuts against the limit end, the second adjusting member is in a limit state, and the pushing portion abuts against the limiting portion to provide a force that drives the second adjusting member to the limit state.

[0015] In some embodiments, the limiting portion has an arc-shaped limiting surface; the pushing portion has a spherical pushing surface, and the limiting surface abuts against the pushing surface.

[0016] In some embodiments, the retaining mechanism includes a fixed sleeve and a telescopic member. The fixed sleeve is fixedly connected to the mounting bracket, and the telescopic member is slidably and telescopically disposed with respect to the pushing member along the axial direction. The telescopic member is axially position-adjustable disposed on the fixed sleeve, and the elastic member is disposed between the fixed sleeve and the pushing member.

[0017] In some embodiments, the presser foot adjustment device includes a connecting shaft and a rotating component. The rotating component is fixedly connected to the connecting shaft and rotatably connected to the mounting bracket around the axis of the connecting shaft. The drive wheel is fixedly connected to the connecting shaft. The axis of the connecting shaft extends collinearly with the first rotating axis. The rotating component is provided with scale markings along its circumference.

[0018] In some embodiments, the presser foot adjusting device includes a stop pin and a stop spring. The stop pin is movably disposed on the mounting bracket and is movably disposed between a locked position and an unlocked position. When in the locked position, the stop pin engages with the rotating member to prevent the rotating member from rotating; when in the unlocked position, the stop pin disengages from the rotating member, allowing the rotating member to rotate. The stop spring provides the force required for the stop pin to move toward the locked position.

[0019] In some embodiments, the first rotating axis is perpendicular to the upper shaft, and the drive member extends perpendicular to the transmission shaft.

[0020] In some embodiments, the abutment portion is spherical; the abutment portion has an arc-shaped abutment surface, which contacts the driving surface.

[0021] In some embodiments, the first adjusting member includes two parts disposed on opposite sides of the swing member along the extension direction of the second rotation axis; the second adjusting member includes two connecting parts spaced apart along the extension direction of the fourth rotation axis, and the first adjusting member and the swing member are disposed between the two connecting parts.

[0022] The purpose of this invention is to provide a sewing machine.

[0023] To achieve the above objectives, the technical solution adopted by this utility model is: a sewing machine, including the above-mentioned sewing machine presser foot adjustment device.

[0024] In some embodiments, the sewing machine has an opening at its upper part communicating with the interior of the sewing machine. The mounting frame includes a mounting plate that covers the opening. The drive wheel, transmission assembly, first adjusting member, second adjusting member, and linkage member are disposed inside the sewing machine. The presser foot adjusting device includes a rotating member for driving the drive wheel to rotate. The rotating member is rotatably connected to the mounting plate and is located on the outside of the sewing machine.

[0025] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The sewing machine of this utility model features a modular design for the presser foot adjustment device, integrating components such as the drive wheel and transmission assembly onto a mounting frame. This allows for easy assembly of the modular presser foot adjustment device as a whole, significantly reducing assembly difficulty. Furthermore, in case of a malfunction in the presser foot adjustment device, the entire module can be removed for repair or replacement, simplifying the repair process. The presser foot adjustment device simply drives the drive wheel to rotate, which in turn drives the transmission shaft. The transmission shaft then transmits the motion sequentially to the second and first adjustment components, thereby affecting the movement pattern of the oscillating component and thus adjusting the presser foot. The device is simple to operate and provides convenience for users. Attached Figure Description

[0026] Appendix Figure 1 This is a three-dimensional schematic diagram of a sewing machine component structure according to a specific embodiment of the present utility model;

[0027] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of the middle section structure;

[0028] Appendix Figure 3 For the appendix Figure 2 This is a schematic diagram from another perspective, showing the rotating component in the first position.

[0029] Appendix Figure 4 For the appendix Figure 3 A schematic diagram showing the status of the middle pressure foot;

[0030] Appendix Figure 5 For the appendix Figure 3 A schematic diagram of the rotating component in the second position;

[0031] Appendix Figure 6 For the appendix Figure 5 A schematic diagram showing the status of the middle pressure foot;

[0032] Appendix Figure 7 This is a schematic diagram of components such as a presser foot adjustment device, upper shaft, eccentric wheel, and swing frame, according to a specific embodiment. The diagram shows the outline of a sewing machine.

[0033] Appendix Figure 8 For the appendix Figure 7 A partial exploded diagram; the upper axis in the diagram only shows a part.

[0034] Appendix Figure 9 for Figure 7 A schematic diagram of the middle section structure;

[0035] Appendix Figure 10 for Figure 7 A schematic diagram of another part of the structure

[0036] Appendix Figure 11 This is a schematic diagram of part of the presser foot adjustment device;

[0037] The components are as follows: 100, upper shaft; 110, eccentric wheel; 120, swinging component; 200, pressure foot; 210, swinging pressure foot; 220, middle pressure foot; 310, lifting shaft; 320, linkage rod; 330, connecting seat; 340, linkage assembly; 1, mounting bracket; 10, marking point; 11, mounting plate; 21, drive wheel; 211, drive surface; 22, connecting shaft; 23, rotating component; 3, transmission assembly; 31, transmission shaft; 32, drive component; 321, abutment part; 4, first adjusting component; 5, second adjusting component; 51, limiting part; 52, connecting part; 61, first connecting rod; 62, second connecting rod; 63, third connecting rod; 7, holding mechanism; 71, pushing component; 711, pushing part; 72, elastic component; 73, fixing sleeve; 74, telescopic component; 75, fixing nut; 81, stop pin; 82, stop spring. Detailed Implementation

[0038] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments, so that the advantages and features of this utility model can be more easily understood by those skilled in the art. Obviously, the embodiments described in this application are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0039] See Figure 1 The sewing machine shown includes a rotatable upper shaft 100, an eccentric wheel 110 eccentrically fixed on the upper shaft 100, and a swing member 120 sleeved on the outside of the eccentric wheel 110 and rotatable around the eccentric wheel 110. The sewing machine also includes a presser foot 200. A linkage mechanism is provided between the swing member 120 and the presser foot 200 to drive the presser foot 200 to move when the swing member 120 moves. Specifically, the eccentric wheel 110 has a first outer wheel surface and a second outer wheel surface that are circumferentially connected. The distance between the first outer wheel surface and the upper shaft 100 is greater than the distance between the second outer wheel surface and the upper shaft 100. During the rotation of the upper shaft 100 around its own axis, the upper shaft 100 drives the eccentric wheel 110 to rotate, and the first outer wheel surface drives the swing member 120 to move relative to the upper shaft 100. The swing member 120 drives the presser foot 200 to reciprocate up and down through the linkage mechanism.

[0040] In this embodiment, see Figure 1 , Figure 7As shown, the sewing machine also includes a presser foot adjustment device, which includes a mounting frame 1, a drive wheel 21, a transmission assembly 3, a first adjustment component 4, and a second adjustment component 5. The drive wheel 21 is rotatably connected to the mounting frame 1 around a first rotation axis X1. The circumference of the drive wheel 21 has a drive surface 211, and the vertical distance between the drive surface 211 and the first rotation axis X1 gradually increases along the direction of rotation around the first rotation axis X1. The transmission assembly 3 includes a drive shaft 31 and a drive component 32. The drive shaft 31 is rotatably connected to the mounting frame 1, and the drive component 32 is fixedly connected to the drive shaft 31. The drive component 32 has a stop portion 321 that abuts against the drive surface 211. The drive wheel 21 is driven to rotate around the first axis of rotation X1, and the abutment part 321 moves along the drive surface 211. Since the distance from the drive surface 211 to the axis of the connecting shaft 22 is different at different points, the abutment part 321 is relatively closer to or relatively farther away from the connecting shaft 22 during the rotation of the drive wheel 21, and the abutment part 321 drives the transmission shaft 31 to rotate.

[0041] In this embodiment, see Figure 8 As shown, the first axis of rotation X1 extends perpendicularly to the upper shaft 100, the transmission shaft 31 extends parallel to the upper shaft 100, and the driving member 32 extends perpendicularly to the transmission shaft 31. When the drive wheel 21 rotates, with the cooperation of the driving surface 211 and the abutment part 321, the driving member 32 can move in a plane perpendicular to the transmission shaft 31, thereby driving the transmission shaft 31 to rotate around its own axis. This arrangement can improve the stability of the rotation of the transmission shaft 31.

[0042] In this embodiment, see Figure 8 As shown, the first adjusting member 4 is rotatably connected to the swing member 120 around the second rotating axis X2, the second adjusting member 5 is rotatably connected to the mounting bracket 1 around the third rotating axis X3, and the second adjusting member 5 is rotatably connected to the first adjusting member 4 around the fourth rotating axis X4. The second rotating axis X2, the third rotating axis X3, the fourth rotating axis X4, and the upper shaft 100 are parallel to each other. Since the first adjusting member 4 is rotatably connected to the swing member 120, it can limit the movement amplitude and direction of the swing member 120. When the position of the fourth rotating axis X4 is fixed, the movement trajectory of the first adjusting member 4 is fixed, that is, it rotates around the fourth rotating axis X4 in this state. At this time, the swing member 120 has a fixed movement mode, and the movement amplitude of the presser foot 200 is constant. When the second adjusting member 5 rotates relative to the mounting bracket 1, the position of the fourth rotating axis X4 changes, and the movement trajectory of the first adjusting member 4 also changes accordingly, thereby influencing and changing the movement mode of the swing member 120. After being transmitted through the linkage mechanism, the movement mode and movement amplitude of the presser foot 200 change.

[0043] In this embodiment, the presser foot adjustment device also includes a linkage component, which is connected between the drive shaft 31 and the second adjustment component 5 so as to drive the second adjustment component 5 to rotate relative to the mounting bracket 1 when the drive shaft 31 rotates. Thus, the user can adjust the presser foot 200 simply by driving the drive wheel 21 to rotate.

[0044] In this embodiment, see Figure 8 , Figure 9 As shown, the presser foot adjustment device includes a rotating component 23 and a connecting shaft 22. The rotating component 23 is fixedly connected to the connecting shaft 22 and rotatably connected to the mounting bracket 1 around the axis of the connecting shaft 22. The axis of the connecting shaft 22 extends collinearly with the first rotation axis X1. The drive wheel 21 is fixedly connected to the connecting shaft 22. When adjusting the presser foot 200, the user drives the drive wheel 21 to rotate by rotating the rotating component 23.

[0045] In this embodiment, see Figure 4 , Figure 6 As shown, the presser foot 200 includes a swing presser foot 210 and a middle presser foot 220. Adjusting the presser foot 200 essentially adjusts the vertical distance between the swing presser foot 210 when it reaches its highest point and the middle presser foot 220 when it reaches its lowest point. In this embodiment, see... Figure 9 As shown, the rotating component 23 has circumferential markings to facilitate precise adjustment of the presser foot 200 by the user. Specifically, the markings on the rotating component 23 indicate the vertical distance between the pendulum presser foot 210 at its highest point and the middle presser foot 220 at its lowest point in the corresponding states. See [reference needed]. Figure 3 , Figure 5 As shown, the mounting bracket 1 is provided with a mark point 10. When the mark point 10 corresponds to any scale mark, the pressure foot 200 is adjusted to the corresponding state.

[0046] In this embodiment, a blocking surface is provided on the outer side of the drive wheel 21. The blocking surface is disposed on the path of the abutment 321 moving along the drive surface 211. The blocking surface is used to limit the direction of movement of the abutment 321 along the drive surface 211, and also to limit the rotation direction of the drive wheel 21, that is, to limit the rotation direction of the rotating member 23. Specifically, the blocking surface is located at the junction of the end of the drive surface 211 closest to the first rotation axis X1 and the end furthest from the first rotation axis X1.

[0047] In this embodiment, the adjustment range of the presser foot adjustment device is 2mm to 5.5mm, and the rotating part 23 has eight scale markings in 0.5mm increments. See also Figure 3 , Figure 4 As shown, the rotating part 23 is in the first position. At this time, the position of the scale mark 2 corresponds to the position of the mark point 10. The vertical distance between the pendulum pressure foot 210 when it moves to the highest point and the middle pressure foot 220 when it moves to the lowest point is s1, where s1 is 2mm. See also Figure 5, Figure 6 As shown, the rotating part 23 is in the second position. At this time, the scale mark 5.5 corresponds to the position of the mark point 10. When the swing pressure foot 210 moves to the highest point and the middle pressure foot 220 moves to the lowest point, the distance between them in the vertical direction is s2, and s2 is 5.5mm.

[0048] In this embodiment, see Figure 8 , Figure 9 As shown, the linkage includes a first link 61, a second link 62, and a third link 63. One end of the first link 61 is fixedly connected to the drive shaft 31, and one end of the third link 63 is connected to the second adjusting member 5. The second link 62 is rotatably connected to the first link 61 around the fifth rotation axis X5, and also rotatably connected to the third link 63 around the sixth rotation axis X6. The fifth rotation axis X5 and the sixth rotation axis X6 are parallel to each other and parallel to the drive shaft 31. The linkage structure achieves the linkage between the drive shaft 31 and the second adjusting member 5, which is simple in structure and has high flexibility and high precision. In this embodiment, one end of the third link 63 is fixedly provided with a rotating shaft, which is rotatably connected to the mounting bracket 1. The axis of the rotating shaft extends collinearly with the third rotation axis X3, and the second adjusting member 5 is fixedly connected to the rotating shaft.

[0049] In some embodiments, the abutment portion 321 has an arc-shaped abutment surface that contacts the drive surface 211, which can effectively reduce the resistance between the abutment portion 321 and the drive surface 211 and improve the smoothness of the drive. In this embodiment, the abutment portion 321 is spherical, and its outer peripheral surface constitutes the abutment surface.

[0050] In this embodiment, see Figure 9 , Figure 11As shown, the second adjusting member 5 has a limiting portion 51, and the presser foot adjusting device includes a holding mechanism 7 for maintaining the stability of the presser foot adjusting device. The holding mechanism 7 includes a pushing member 71 and an elastic member 72. The pushing member 71 is movably mounted on the mounting bracket 1 and has a pushing portion 711 that abuts against the limiting portion 51. The elastic member 72 provides the force required to drive the pushing portion 711 toward the limiting portion 51. Under the action of the elastic member 72, the pushing portion 711 and the limiting portion 51 are maintained in an abutting state. Specifically, the driving surface 211 has a limit end, and the vertical distance between the limit end and the first rotation axis X1 is minimal. When the abutting portion 321 abuts against the limit end, the second adjusting member 5 is in a limit state, and the pushing portion 711 abuts against the limiting portion 51 to provide the force to drive the second adjusting member 5 to switch to the limit state. This force can maintain balance with the pushing force between the drive wheel 21 and the abutment 321, thereby stabilizing the transmission assembly 3, the linkage, and the second adjusting member 5, and thus stabilizing the pressure foot adjusting device. At the same time, under the force of the pushing part 711, the abutment 321 will tend to move towards the drive surface 211, thereby ensuring that the abutment 321 and the drive surface 211 always abut against each other, ensuring normal cooperation between the drive wheel 21 and the transmission assembly 3, ensuring that the drive member 32 can move away from the connecting shaft 22 under the push of the drive surface 211, and ensuring that the drive member 32 can return to the direction closer to the connecting shaft 22 under the action of the holding mechanism 7 when the drive wheel 21 rotates in the opposite direction.

[0051] In this embodiment, the movement path of the pusher 71 deviates from and is perpendicular to the third rotation axis X3, thus achieving the aforementioned effect more effectively. See also: Figure 9 As shown, the limiting part 51 has an arc-shaped limiting surface, and the pushing part 711 has a spherical pushing surface. The limiting surface and the pushing surface abut against each other. This arrangement can reduce the resistance generated when the pushing part 711 and the limiting part 51 move relative to each other, thereby ensuring the smoothness and stability of the mechanism 7 during the adjustment of the presser foot 200 and improving the durability of the presser foot adjustment device.

[0052] In this embodiment, the retaining mechanism 7 includes a fixed sleeve 73 and a telescopic member 74. The fixed sleeve 73 is fixedly connected to the mounting bracket 1. The telescopic member 74 and the pushing member 71 are slidably telescopically arranged along the axial direction, and the telescopic member 74 is axially adjustable on the fixed sleeve 73. The elastic member 72 is disposed between the fixed sleeve 73 and the pushing member 711. The user can adjust the position of the telescopic member 74 according to actual needs, thereby adjusting the distance that the pushing member 71 can move relative to the limiting member 51, and can change the magnitude of the force applied to the limiting member 51 by changing the compression amount.

[0053] In this embodiment, the telescopic member 74 and the fixed sleeve 73 are threaded together, which not only fixes the two together but also allows the position of the telescopic member 74 to be adjusted by rotating it relative to the fixed sleeve 73. In this embodiment, the pushing member 71 is located on the side of the fixed sleeve 73 near the limiting part 51, and part of the telescopic member 74 is located on the side of the fixed sleeve 73 away from the limiting part 51, making it convenient for the user to adjust the telescopic member 74. In this embodiment, the elastic member 72 is a spring sleeved on the outside of the pushing member, with one end of the spring abutting against the fixed sleeve 73 and the other end abutting against the pushing part 711.

[0054] In this embodiment, the retaining mechanism 7 is also provided with a fixing nut 75, which is threadedly connected to the telescopic member 74. The fixing nut 75 is located on the side of the fixing sleeve 73 away from the limiting part 51 and abuts against the fixing sleeve 73. The fixing nut 75 is provided to improve the stability of the telescopic member 74 and the fixing sleeve 73.

[0055] In this embodiment, see Figure 8 As shown, the presser foot adjustment device also includes a stop pin 81 and a stop spring 82. The stop pin 81 is movably mounted on the mounting bracket 1 and is movably positioned between a locked position and an unlocked position. When in the locked position, the stop pin 81 cooperates with the rotating member 23 to prevent the rotating member 23 from rotating. When in the unlocked position, the stop pin 81 disengages from the rotating member 23, allowing the rotating member 23 to rotate. The stop spring 82 provides the force required for the stop pin 81 to move towards the locked position. Specifically, the stop pin 81 moves axially parallel to the connecting shaft 22. After the rotating member 23 stops rotating, the stop pin 81, driven by the stop spring 82, abuts against the rotating member 23 to prevent the rotating member 23 from rotating. Through the cooperation of the stop pin 81 and the stop spring 82, resistance to the rotation of the rotating member 23 is provided, which on the one hand prevents the rotating member 23 from being accidentally touched, and on the other hand, cooperates with the holding mechanism 7 to maintain the stability of the presser foot adjustment device.

[0056] In some embodiments, the rotating member 23 is provided with a locking groove that cooperates with the stop pin 81. When the rotating member 23 stops rotating, the stop pin 81 is inserted into the locking groove and is in the locked position. The stop pin 81 cooperates with the locking groove to prevent the rotating member 23 from rotating. When the user applies external force to drive the rotating member 23 to rotate, the stop pin 81 can be disengaged from the locking groove, thereby releasing the lock on the rotating member 23.

[0057] In this embodiment, see Figure 10 As shown, the first adjusting member 4 includes two parts located on opposite sides of the swing member 120 extending along the second rotation axis X2, and the second adjusting member 5 includes two connecting parts 52 spaced apart extending along the fourth rotation axis X4. The first adjusting member 4 and the swing member 120 are disposed between the two connecting parts 52. This arrangement improves the stability of the linkage and saves space.

[0058] In this embodiment, see Figure 9 As shown, the linkage is connected to one end of the drive shaft 31, and the second adjusting member 5 is located on the side of the linkage close to the drive shaft 31. This arrangement is used to reduce the volume of the presser foot adjusting device.

[0059] In this embodiment, see Figure 1 , Figure 7 As shown, the upper part of the sewing machine has an opening connecting the sewing machine to its interior. The mounting frame 1 includes a mounting plate 11, which covers the opening. The drive wheel 21, transmission assembly 3, first adjusting member 4, second adjusting member 5, and linkage member are located inside the sewing machine, which can prevent the above components from being interfered with and contaminated. In this embodiment, the rotating member 23 is rotatably connected to the mounting plate 11 around the axis of the connecting shaft 22, and the rotating member 23 is located on the outside of the sewing machine. In this embodiment, the fixing sleeve 73 is fixed on the mounting plate 11, part of the pushing member 71 extends to the outside of the sewing machine, and the telescopic member 74 is located on the outside of the sewing machine. Specifically, see Figure 1 , Figure 7 As shown, the rotating part 23, the telescopic part 74 and the fixing nut 75 are located on the top of the mounting plate 11, which facilitates the user's adjustment operation.

[0060] In this embodiment, the upper shaft 100 and the transmission shaft 31 extend in the horizontal direction, the connecting shaft 22 extends in the vertical direction, and the pusher 71 is arranged to move up and down.

[0061] In this embodiment, see Figure 2 , Figure 10 As shown, the linkage mechanism includes a lifting shaft 310 and a linkage rod 320. The lifting shaft 310 is arranged parallel to the upper shaft 100, and the linkage rod 320 is rotatably connected between the lifting shaft 310 and the swing member 120. When the swing member 120 moves, it can drive the lifting shaft 310 to swing. The linkage mechanism also includes a linkage assembly 340 disposed between the lifting shaft 310 and the pressure foot 200, so that when the lifting shaft 310 moves, the linkage assembly 340 drives the pressure foot 200 to reciprocate up and down. Specifically, when the upper shaft 100 rotates and drives the swing member 120 to move, the swing member 120 drives the lifting shaft 310 to reciprocate through the linkage rod 320, and the lifting shaft 310 drives the pressure foot 200 to reciprocate up and down through the linkage assembly 340. The linkage assembly 340 can adopt a structure already existing in the prior art, so it will not be described in detail here.

[0062] In this embodiment, the linkage rod 320, the first adjusting member 4, and the swing member 120 are rotatably connected around the second rotation axis X2. Thus, the first adjusting member 4 directly restricts and influences the movement mode of the swing member 120 and the movement mode of the linkage rod 320 connected to the swing member 120 through the second rotation axis X2, thereby controlling the swing mode and swing amplitude of the lifting shaft 310.

[0063] In this embodiment, a connecting seat 330 is fixedly provided at one end of the lifting shaft 310, and the linkage rod 320 is rotatably connected to the connecting seat 330 around the seventh rotation axis X7. The seventh rotation axis X7 is parallel to the axis of the lifting shaft 310.

[0064] In summary, the sewing machine of this embodiment features a modular design for the presser foot adjustment device. Components such as the drive wheel 21 and transmission assembly 3 are integrated onto the mounting frame 1, allowing for direct assembly of the presser foot adjustment device as a whole during sewing machine assembly. During assembly, only the first adjusting component 4 and the swing component 120 need to be connected for presser foot adjustment, simplifying the connection process and significantly reducing assembly difficulty. Furthermore, in case of malfunction, the entire module can be removed for repair or replacement, simplifying maintenance as well. The presser foot adjustment device uses the rotating component 23 to drive the drive wheel 21, which in turn drives the transmission shaft 31. The transmission shaft 31 then transmits the motion sequentially to the second adjusting component 5 and the first adjusting component 4 via a linkage, thereby affecting the movement mode of the swing component 120 and adjusting the presser foot 200. The device is simple to operate and provides convenience for the user.

[0065] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sewing machine presser foot adjustment device, the sewing machine comprising a rotatably mounted upper shaft, an eccentric wheel eccentrically fixed on the upper shaft, and a swinging member sleeved on the outside of the eccentric wheel and rotatable around the eccentric wheel; the sewing machine further comprising a presser foot, wherein a linkage mechanism is provided between the swinging member and the presser foot to drive the presser foot to move when the swinging member moves; characterized in that, The presser foot adjustment device includes: Mounting bracket, A drive wheel is rotatably connected to the mounting bracket about a first axis of rotation. The drive wheel has a drive surface on its circumference. The vertical distance between the drive surface and the first axis of rotation gradually increases along the direction of rotation about the first axis of rotation. A transmission assembly includes a transmission shaft and a drive component, wherein the transmission shaft is rotatably connected to the mounting bracket, the drive component is fixedly connected to the transmission shaft, and the drive component has a contact portion that abuts against the drive surface; The first adjusting component is rotatably connected to the swing component about the second axis of rotation; The second adjusting member is rotatably connected to the mounting bracket about the third rotating axis, and the second adjusting member is rotatably connected to the first adjusting member about the fourth rotating axis. The second rotating axis, the third rotating axis, the fourth rotating axis and the upper shaft are parallel to each other. A linkage component is connected between the drive shaft and the second adjusting component to drive the second adjusting component to rotate relative to the mounting bracket when the drive shaft rotates.

2. The sewing machine presser foot adjustment device of claim 1, wherein: The drive shaft is parallel to the upper shaft. The linkage includes a first link, a second link, and a third link. One end of the first link is fixedly connected to the drive shaft. One end of the third link is connected to the second adjusting member. The second link is rotatably connected to the first link around a fifth rotation axis. The second link is rotatably connected to the third link around a sixth rotation axis. The fifth rotation axis and the sixth rotation axis are parallel to each other and are parallel to the drive shaft.

3. The sewing machine presser foot adjustment device of claim 1, wherein: The second adjusting member has a limiting portion; the presser foot adjusting device includes a retaining mechanism for maintaining stability, the retaining mechanism including a pushing member and an elastic member, the pushing member being movably disposed on the mounting bracket, the pushing member having a pushing portion that abuts against the limiting portion; the elastic member provides the force required to drive the pushing portion toward the limiting portion.

4. The sewing machine presser foot adjustment device of claim 3, wherein: The movement path of the pusher is deviated from and perpendicular to the third rotation axis; And / or, the driving surface has a limit end, the vertical distance between the limit end and the first rotation axis is minimal; when the abutment part abuts against the limit end, the second adjusting member is in a limit state, and the pushing part abuts against the limiting part to provide a force to drive the second adjusting member to the limit state.

5. The sewing machine presser foot adjustment apparatus of claim 3, wherein: The limiting part has an arc-shaped limiting surface; the pushing part has a spherical pushing surface, and the limiting surface abuts against the pushing surface.

6. The sewing machine presser foot adjustment apparatus of claim 3, wherein: The retaining mechanism includes a fixed sleeve and a telescopic member. The fixed sleeve is fixedly connected to the mounting bracket. The telescopic member and the pushing member are slidably telescopically arranged along the axial direction. The telescopic member is axially adjustable on the fixed sleeve. The elastic member is arranged between the fixed sleeve and the pushing member.

7. The sewing machine presser foot adjustment apparatus of claim 1, wherein: The presser foot adjustment device includes a connecting shaft and a rotating component. The rotating component is fixedly connected to the connecting shaft and rotatably connected to the mounting bracket around the axis of the connecting shaft. The drive wheel is fixedly connected to the connecting shaft. The axis of the connecting shaft extends collinearly with the first axis of rotation. The rotating component is provided with scale markings along its circumference. And / or, the presser foot adjusting device further includes a stop pin and a stop spring. The stop pin is movably disposed on the mounting bracket and is movably disposed between a locked position and an unlocked position. When in the locked position, the stop pin engages with the rotating member to prevent the rotating member from rotating; when in the unlocked position, the stop pin disengages from the rotating member, allowing the rotating member to rotate. The stop spring provides the force required for the stop pin to move toward the locked position.

8. The sewing machine presser foot adjustment apparatus of claim 1, wherein: The first rotating axis is perpendicular to the upper shaft, and the driving member extends perpendicular to the transmission shaft; And / or, the abutment portion is spherical; the abutment portion has an arc-shaped abutment surface, the abutment surface being in contact with the driving surface; And / or, the first adjusting member includes two parts disposed on opposite sides of the swing member along the extension direction of the second rotation axis; the second adjusting member includes two connecting parts spaced apart along the extension direction of the fourth rotation axis, and the first adjusting member and the swing member are disposed between the two connecting parts.

9. A sewing machine characterized by: Includes the sewing machine presser foot adjustment device as described in any one of claims 1 to 8.

10. The sewing machine of claim 9, wherein: The sewing machine has an opening at its upper part that connects to the interior of the sewing machine. The mounting frame includes a mounting plate that covers the opening. The drive wheel, transmission assembly, first adjusting member, second adjusting member, and linkage member are disposed inside the sewing machine. The presser foot adjustment device includes a rotating component for driving the drive wheel to rotate. The rotating component is rotatably connected to the mounting plate and is located on the outside of the sewing machine.

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