Sewing machine with adjustable presser foot linkage
By using an adjustable presser foot linkage structure, and utilizing toothed engagement and a pull plate design, the problem of low presser foot adjustment precision in sewing machines is solved, enabling fast and precise presser foot height adjustment to meet the sewing needs of different fabrics.
Patent Information
- Application Number
- CN202611365297.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-04
- Publication Date
- 2026-11-03
AI Technical Summary
The existing sewing machine presser foot linkage structure has low adjustment precision, is cumbersome to operate, relies on manual experience, and is difficult to adapt to the processing needs of different fabrics.
The adjustable presser foot linkage structure is adopted. The first tooth on the presser foot rod meshes with the second tooth of the extrusion seat to lock the position of the presser foot slider. Combined with the design of the pull plate, movable rod and spring, the presser foot height can be adjusted quickly and accurately.
It enables quick and precise adjustment of presser foot height, simplifies the operation process, improves adjustment accuracy and adaptability, and meets the sewing needs of fabrics of different thicknesses.
Smart Images
Figure CN123027701A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of sewing machine technology, specifically to a sewing machine with an adjustable presser foot linkage structure. Background Technology
[0002] Sewing machines are core processing equipment in the textile sewing industry. They use a presser foot to press the fabric to be sewn, and in conjunction with the needle and feed mechanism, complete the continuous sewing process. The presser foot linkage structure, as the core transmission structure connecting the power drive component and the presser foot assembly, directly determines the presser foot's lifting stroke, pressing force, and movement stability. It is a key structure for ensuring sewing quality and adapting to different fabrics. In actual sewing production, differences in fabric thickness, material hardness, and sewing techniques all place different demands on the presser foot's pressing height, lifting stroke, and pressing force. The adjustability of the presser foot linkage structure directly affects the sewing machine's processing adaptability and finished product quality.
[0003] Currently, most conventional sewing machines on the market have a fixed, integrated presser foot linkage structure. When adjusting the presser foot's stroke, the presser foot slider is moved along the presser foot rod by turning the bolt and nut to adjust the presser foot's stroke.
[0004] The inventors of this application discovered in their research that the core defect of the prior art is that the prior art uses the method of tightening bolts for adjustment, which has low adjustment accuracy and is cumbersome to operate. The method of adding or removing shims and fine-tuning screws relies on manual experience, has poor repeatability, and the debugging process is time-consuming and laborious, which is not conducive to the unified control of parameters in mass production. Summary of the Invention
[0005] This invention provides a sewing machine with an adjustable presser foot linkage structure, which solves the problems of low presser foot adjustment accuracy, cumbersome operation and poor practicality in the prior art. It enables rapid presser foot adjustment and allows for a clear and intuitive understanding of the effect of the adjustment distance.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a sewing machine with an adjustable presser foot linkage structure, comprising a worktable, a mounting base mounted on the top of the worktable, a machine body mounted on one side of the top of the mounting base, a needle plate mounted on the side of the top of the mounting base away from the machine body, a detachable cover mounted on the side wall of the machine body, and an adjustment mechanism disposed on the inner side of one end of the machine body. The adjustment mechanism includes a presser foot assembly, an adjustment assembly, and a pressure assembly; The presser foot assembly is located on the inner side of one end of the machine body; An adjustment component is disposed on the presser foot assembly. The adjustment component includes a presser foot rod that extends through the bottom of one end of the machine body. A presser foot slider is sleeved on the outer side of one end of the presser foot rod. A first tooth is fixed on the outer ring surface of the top end of the presser foot rod. A guide block is fixed on the inner wall of the presser foot slider. A pressing rod extends from the inner side of one end of the presser foot slider. A pressing seat is fixed on one end of the pressing rod. A second tooth is fixed on the other end of the pressing seat. A guide groove is opened on the side wall of the pressing rod. A pull plate is fixed on the end of the pressing rod away from the pressing seat. A movable rod is fixed at the corner of the pull plate. A first auxiliary slide plate is sleeved on the outer ring surface of one end of the movable rod. A first spring is fixedly connected to the surface of one end of the first auxiliary slide plate. The pressure assembly is installed on one side of the top of the machine body.
[0007] By adopting the above technical solution, the position and height of the presser foot body can be easily adjusted according to actual adjustment needs during subsequent use, thereby adapting to the sewing of fabrics of different thicknesses. During adjustment, the first tooth on the presser foot rod and the second tooth on the extrusion seat mesh with each other to lock the position of the presser foot slider. This eliminates the traditional adjustment method of turning bolts and nuts and adding or removing shims. It does not require manual adjustment experience. Pulling the pull plate can disengage the teeth, allowing for quick sliding adjustment of the presser foot slider position on the presser foot rod. The adjustment operation is simple and quick, and the tooth engagement position can intuitively provide feedback on the adjustment distance, resulting in higher adjustment accuracy.
[0008] Preferably, the bottom of the presser foot rod is fixedly provided with a presser foot body, the side wall of the presser foot slider is fixedly provided with a sliding block, and a lifting hook is installed on the inner wall of one end of the machine body.
[0009] Preferably, the top of the presser foot rod has a slot, a pressure rod extends from the inner side of the slot, a threaded connection seat is fixed to the top of the pressure rod, and a pressure spring is sleeved on the outer side of the pressure rod.
[0010] Preferably, a needle body is provided on one side of the presser foot body, a needle rod is fixedly provided at the top of the needle body, a connecting block is fixedly provided on the needle rod, a pull rod is rotatably connected to one end of the connecting block, a sliding groove is provided on the side wall of the pull rod, an adjusting rod is connected to the side of the pull rod away from the connecting block, an extension plate is engaged inside the sliding groove, and a locking seat is fixedly provided at the other end of the adjusting rod.
[0011] Preferably, a snap-fit rod is fixedly provided on the side wall of the snap-fit seat, and a groove is provided on the outer ring surface of the snap-fit rod. A rotating wheel is connected to the side of the snap-fit seat near the machine body, and a snap-fit groove is provided on the surface of the rotating wheel. A protrusion is fixedly provided on the inner wall of the snap-fit groove.
[0012] Preferably, the side wall of the adjusting rod is provided with a locking hole, a locking rod extends from the inner side of one end of the pull rod, a second auxiliary sliding plate is sleeved on the outer ring surface of one end of the locking rod, and a second spring is fixedly connected to one end surface of the second auxiliary sliding plate.
[0013] Preferably, the extrusion seat is slidably connected to the presser foot slider via the extrusion rod, and the second teeth are arranged in an equidistant array along the side wall of the extrusion seat; The cross-section of the second tooth is a right trapezoid.
[0014] Preferably, the pull plate is slidably connected to the pressure foot slider via a movable rod, and the movable rod is symmetrically distributed along the vertical center line of the pull plate.
[0015] Preferably, the outer diameter of the pressure rod is adapted to the inner diameter of the slot, and the two ends of the pressure spring are respectively connected to one end surface of the pressure foot rod and the inner wall of the machine body.
[0016] Preferably, the lock holes are arranged in an equidistant array along the two side walls of the adjusting rod, and the inner diameter of the lock holes is adapted to the outer diameter of the locking rod.
[0017] This invention provides a sewing machine with an adjustable presser foot linkage structure. It has the following advantages: 1. This invention, through its adjustable components, allows for convenient adjustment of the presser foot's position and height according to actual needs during use, thus adapting to the sewing of fabrics of different thicknesses. During adjustment, the first tooth on the presser foot rod engages with the second tooth of the pressing seat to lock the presser foot slider. This eliminates the traditional method of adjusting by tightening bolts and nuts or adding / removing shims, and does not rely on manual adjustment experience. Pulling the pull plate disengages the teeth, allowing for quick and easy adjustment of the presser foot slider's position on the presser foot rod. The adjustment operation is simple and quick, and the tooth engagement setting provides intuitive feedback on the adjustment distance, resulting in higher adjustment precision.
[0018] 2. This invention, through the design of a pull rod, adjusting rod, locking rod, and rotating wheel, achieves gear-type positioning during subsequent use by engaging the locking holes equidistantly arranged on the locking rod and adjusting rod. The locking groove of the rotating wheel is linked with the locking rod, allowing for gear adjustment and locking of the needle bar's travel stroke. This enables adjustable linkage parameters between the needle bar and presser foot assembly. The entire linkage structure provides a secure lock and clear gear adjustment, further expanding the sewing machine's adaptability to different sewing processes. Attached Figure Description
[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a side view of the body of the present invention; Figure 3 This is a side view of the presser foot rod of the present invention; Figure 4 This is a side view of the presser foot slider of the present invention; Figure 5 This is a schematic diagram of the cross-section of the pressure foot slider of the present invention; Figure 6 This is a side view of the adjusting rod of the present invention; Figure 7 This is a schematic diagram of the cross-section of the tie rod of the present invention; Figure 8 This is a side view of the rotor of the present invention.
[0020] The components include: 1. Workbench; 2. Mounting base; 3. Machine body; 4. Needle plate; 5. Removal cover; 6. Presser foot rod; 7. Presser foot body; 8. Presser foot slider; 9. Sliding block; 10. Lifting hook; 11. First tooth; 12. Guide block; 13. Extrusion rod; 14. Extrusion seat; 15. Second tooth; 16. Guide groove; 17. Pull plate; 18. Movable rod; 19. First auxiliary slide plate; 20. First spring; 21. 21. Slot; 22. Pressure rod; 23. Threaded connector; 24. Pressure spring; 25. Needle body; 26. Needle bar; 27. Connecting block; 28. Pull rod; 29. Slide groove; 30. Adjusting rod; 31. Extension plate; 32. Snap-fit seat; 33. Snap-fit rod; 34. Groove; 35. Rotary wheel; 36. Snap-fit groove; 37. Protrusion; 38. Locking hole; 39. Locking rod; 40. Second auxiliary slide plate; 41. Second spring. Detailed Implementation
[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] Please see the appendix Figure 1 - Appendix Figure 8 This invention provides a sewing machine with an adjustable presser foot linkage structure, including a worktable 1, a mounting base 2 mounted on the top of the worktable 1, a machine body 3 mounted on one side of the top of the mounting base 2, a needle plate 4 mounted on the side of the top of the mounting base 2 away from the machine body 3, a detachable cover 5 detachably mounted on the side wall of the machine body 3, and an adjustment mechanism disposed on the inner side of one end of the machine body 3. The adjustment mechanism includes a pressure foot assembly, an adjustment assembly, and a pressure assembly; The presser foot assembly is located on the inner side of one end of the body 3; An adjustment component is provided on the presser foot assembly. The adjustment component includes a presser foot rod 6, which passes through the bottom of one end of the machine body 3. A presser foot slider 8 is sleeved on the outer side of one end of the presser foot rod 6. A first tooth 11 is fixed on the outer ring surface of the top end of the presser foot rod 6. A guide block 12 is fixed on the inner wall of the presser foot slider 8. A pressing rod 13 extends from the inner side of one end of the presser foot slider 8. A pressing seat 14 is fixed on one end of the pressing rod 13. A second tooth 15 is fixed on the other end of the pressing seat 14. A guide groove 16 is opened on the side wall of the pressing rod 13. A pull plate 17 is fixed on the end of the pressing rod 13 away from the pressing seat 14. A movable rod 18 is fixed at the corner of the pull plate 17. A first auxiliary slide plate 19 is sleeved on the outer ring surface of one end of the movable rod 18. A first spring 20 is fixedly connected to the surface of one end of the first auxiliary slide plate 19. The pressure assembly is installed on one side of the top of the body 3; Specifically, during use, the presser foot assembly is pre-installed on the inner side of one end of the body 3. When the position of the presser foot assembly needs to be adjusted later, the disassembly cover 5 is disassembled beforehand. Then, the pull plate 17 is pulled, and the pull plate 17 moves outward under force. With the movement of the pull plate 17, the extrusion rod 13 can move accordingly. The extrusion rod 13 slides along the guide block 12 fixed on the inner wall of the presser foot slider 8 through the guide grooves 16 opened on its two side walls. This improves the stability of the extrusion rod 13 during movement and prevents the extrusion rod 13 from shifting its position during movement. With the movement of the extrusion rod 13, the extrusion seat 14 can also move accordingly, thereby causing the extrusion seat 14 to separate the second tooth 15 from the first tooth 11. With the separation of the two, the position of the presser foot slider 8 on the presser foot rod 6 can be adjusted longitudinally. As the pull plate 17 moves, it pulls the movable rod 18, causing the movable rod 18 to slide inside the presser foot slider 8. During the movement of the movable rod 18, the first auxiliary slide plate 19 can be moved. Since the two ends of the first spring 20 are fixedly connected to one end surface of the first auxiliary slide plate 19 and the inner wall of the presser foot slider 8, the movement of the first auxiliary slide plate 19 can cause the first spring 20 to deform and generate a reverse force. When the pulling force applied to the pull plate 17 disappears, the reverse force will push the first auxiliary slide plate 19 in the opposite direction, thereby using the first auxiliary slide plate 19 to drive the movable rod 18 to reset. At this time, under the action of the movement of the movable rod 18, the pressing seat 14 can drive the second tooth 15 to re-engage with the first tooth 11. It is worth noting that since the first teeth 11 are equidistantly arrayed on the surface of the presser foot rod 6, the adjustment distance can be determined by observing the number of first teeth 11 covered when adjusting the presser foot slider 8, making the overall process more intuitive. Furthermore, since the right-angled surfaces of the first teeth 11 and the second teeth 15 are both right-angled trapezoids, they can effectively limit the movement when they come into contact with each other. This prevents the presser foot slider 8 from changing position during subsequent operation and provides support for the presser foot rod 6 to move longitudinally. Moreover, when the presser foot slider 8 moves to the highest adjustable position of the presser foot rod 6, only a longitudinal thrust needs to be applied to the presser foot rod 6 to adjust the longitudinal position of the presser foot slider 8 along the presser foot rod 6. At this time, the travel of the presser foot assembly can be adjusted without disassembling the disassembly cover 5, making the overall process more flexible and convenient.
[0023] Please see the appendix Figure 2 Appendix Figure 3 and attached Figure 4 The bottom of the presser foot rod 6 is fixedly provided with the presser foot body 7, the side wall of the presser foot slider 8 is fixedly provided with the sliding block 9, and the inner wall of one end of the machine body 3 is provided with the lifting hook 10. Specifically, in use, the movement of the lifting hook 10 can drive the presser foot slider 8 to move, which in turn facilitates the subsequent use of the presser foot slider 8 to drive the presser foot rod 6 to move longitudinally. The sliding block 9 is engaged in the slot opened on the inner side of the lifting hook 10, which can provide a guiding effect when adjusting the presser foot slider 8.
[0024] Please see the appendix Figure 3 and attached Figure 4 The top of the presser foot 6 is provided with a slot 21, and a pressure rod 22 extends from the inside of the slot 21. A threaded connection seat 23 is fixed to the top of the pressure rod 22, and a pressure spring 24 is sleeved on the outside of the pressure rod 22. Specifically, during installation, one end of the pressure rod 22 extends into the slot 21 at the top of the presser foot rod 6. Then, the pressure rod 22 is threadedly connected to the body 3 through the threaded connection seat 23, locking the pressure rod 22. As the pressure rod 22 is locked, the two ends of the pressure spring 24 sleeved on the outside of the pressure rod 22 contact the top of the presser foot rod 6 and the top of the inner wall of the body 3, respectively. When the presser foot rod 6 moves longitudinally, it can drive the pressure spring 24 to deform and generate a reverse force, which facilitates the subsequent reset of the presser foot rod 6. When the pressure rod 22 is assembled, there is still a certain distance between the bottom of the pressure rod 22 and the deepest part of the slot 21.
[0025] Please see the appendix Figure 2 and attached Figure 6A needle body 25 is provided on one side of the presser foot body 7. A needle rod 26 is fixed at the top of the needle body 25. A connecting block 27 is fixed on the needle rod 26. A pull rod 28 is rotatably connected to one end of the connecting block 27. A sliding groove 29 is provided on the side wall of the pull rod 28. An adjusting rod 30 is connected to the side of the pull rod 28 away from the connecting block 27. An extension plate 31 is engaged inside the sliding groove 29. A locking seat 32 is fixed at the other end of the adjusting rod 30. Specifically, when adjusting the stroke of the needle body 25, the position of the locking seat 32 is pre-adjusted. When the locking seat 32 moves, it will drive the extension plate 31 to slide along the slide groove 29, thereby improving the stability of the locking seat 32 during movement. At the same time, as the extension plate 31 moves, the pull rod 28 will move inside the extension plate 31, thereby adjusting the distance between the two, so as to facilitate the subsequent adjustment of the stroke of the needle body 25, making it suitable for sewing fabrics of different thicknesses.
[0026] Please see the appendix Figure 6 and attached Figure 8 The side wall of the snap-fit seat 32 is fixedly provided with a snap-fit rod 33, and the outer ring surface of the snap-fit rod 33 is provided with a groove 34. The side of the snap-fit seat 32 near the machine body 3 is connected to a rotating wheel 35, and the surface of the rotating wheel 35 is provided with a snap-fit groove 36. The inner wall of the snap-fit groove 36 is fixedly provided with a protrusion 37. Specifically, when the locking seat 32 is connected to the rotating wheel 35, the locking seat 32 will drive the locking rod 33 to engage with the locking groove 36 opened on the surface of the rotating wheel 35. As the two engage, the groove 34 opened in a ring array along the outer ring surface of the locking rod 33 will engage with the protrusion 37 opened in a ring array on the inner wall of the locking groove 36. The engagement of the groove 34 and the protrusion 37 can improve the stability of the engagement between the locking rod 33 and the locking groove 36. Since there are multiple vertically arranged locking slots 36, the needle body 25 can be initially adjusted for different strokes by engaging the locking rod 33 with the locking slots 36 at different positions.
[0027] Please see the appendix Figure 6 and attached Figure 7 The side wall of the adjusting rod 30 is provided with a locking hole 38, and a locking rod 39 extends from the inner side of one end of the pull rod 28. A second auxiliary slide plate 40 is sleeved on the outer ring surface of one end of the locking rod 39, and a second spring 41 is fixedly connected to one end surface of the second auxiliary slide plate 40. Specifically, when the pull rod 28 extends to a suitable position inside one end of the adjusting rod 30, the locking rod 39 moves to one side of the lock hole 38. At this time, the center lines of the two are on the same center line, which causes the pressure applied to the locking rod 39 to disappear. Since the locking rod 39 will cause the second spring 41 to deform and generate a reverse force when it is subjected to force, when the pressure applied to the locking rod 39 disappears, the reaction force generated by the deformation of the second spring 41 can easily push the second auxiliary slide plate 40 in the reverse direction. Then, the movement of the second auxiliary slide plate 40 can drive the locking rod 39 to reset, thereby inputting one end of the locking rod 39 into the lock hole 38, thus realizing a stable connection between the pull rod 28 and the adjusting rod 30. It is worth noting that since there are multiple locking holes 38, the distance between the pull rod 28 and the adjusting rod 30 can be adjusted by engaging the locking rod 39 with multiple locking holes 38 at different positions, thereby achieving the stroke adjustment of different needle bodies 25.
[0028] Please see the appendix Figure 5 The extrusion seat 14 is slidably connected to the press foot slider 8 via the extrusion rod 13, and the second teeth 15 are arranged in an equidistant array along the side wall of the extrusion seat 14. The cross-section of the second tooth 15 is a right trapezoid shape; Specifically, since the right-angled surface of the second tooth 15 is a right-angled trapezoid and the cross-section of the first tooth 11 is also a right-angled trapezoid, when the right-angled surfaces of the two teeth come into contact with each other, it is convenient to achieve the limiting effect, and the movement of the second tooth 15 will drive the first tooth 11 to move accordingly.
[0029] Please see the appendix Figure 5 The pull plate 17 is slidably connected to the pressure foot slider 8 via the movable rod 18, and the movable rod 18 is symmetrically distributed along the vertical center line of the pull plate 17; Specifically, when the pull plate 17 is subjected to force and moves, it will drive the movable rod 18 to slide inside the pressure foot slider 8. Since there are multiple movable rods 18, the stability of the pull plate 17 during movement can be improved by combining the opening of multiple movable rods 18.
[0030] Please see the appendix Figure 3 The outer diameter of the pressure rod 22 is matched with the inner diameter of the slot 21, and the two ends of the pressure spring 24 are respectively connected to one end surface of the pressure foot rod 6 and the inner wall of the body 3. Specifically, during installation, one end of the pressure rod 22 extends into the slot 21 at the top of the pressure foot rod 6. As the pressure foot rod 6 moves, the slot 21 allows the pressure spring 24 to deform, generating a reverse force, which facilitates the subsequent reset of the pressure foot rod 6.
[0031] Please see the appendix Figure 6and attached Figure 7 The lock holes 38 are equidistantly arranged along the two side walls of the adjusting rod 30, and the inner diameter of the lock holes 38 is adapted to the outer diameter of the locking rod 39.
[0032] Specifically, since the size of the locking rod 39 is compatible with the size of the lock hole 38, once one end of the locking rod 39 is inserted into the inside of the lock hole 38, it is convenient to subsequently limit the position of the pull rod 28, ensuring the stability of the connection between the pull rod 28 and the adjusting rod 30.
[0033] Workflow: In use, one end of the pressure rod 22 is pre-extended into the slot 21 at the top of the presser foot rod 6. Then, the pressure rod 22 is threadedly connected to the machine body 3 via the threaded connector 23, locking the pressure rod 22. With the pressure rod 22 locked, the two ends of the pressure spring 24, sleeved on the outside of the pressure rod 22, contact the top of the presser foot rod 6 and the top of the inner wall of the machine body 3, respectively. When the presser foot rod 6 moves longitudinally, it causes the pressure spring 24 to deform, generating a reverse force, facilitating the subsequent reset of the presser foot rod 6. When the position of the presser foot assembly needs to be adjusted later, the disassembly cover 5 is pre-removed. Then, pull the pull plate 17. At this time, the pull plate 17 is subjected to force and moves outward. With the movement of the pull plate 17, the extrusion rod 13 can move accordingly. The extrusion rod 13 slides along the guide block 12 fixed on the inner wall of the presser foot slider 8 through the guide groove 16 opened on its two side walls. This improves the stability of the extrusion rod 13 during movement and prevents the extrusion rod 13 from shifting its position during movement. With the movement of the extrusion rod 13, the extrusion seat 14 can also move accordingly, thereby causing the extrusion seat 14 to separate the second tooth 15 from the first tooth 11. With the separation of the two, the position of the presser foot slider 8 on the presser foot rod 6 can be adjusted longitudinally. As the pull plate 17 moves, it pulls the movable rod 18, causing the movable rod 18 to slide inside the presser foot slider 8. During the movement of the movable rod 18, the first auxiliary slide plate 19 can be moved. Since the two ends of the first spring 20 are fixedly connected to one end surface of the first auxiliary slide plate 19 and the inner wall of the presser foot slider 8, the movement of the first auxiliary slide plate 19 can cause the first spring 20 to deform and generate a reverse force. When the pulling force applied to the pull plate 17 disappears, the reverse force will push the first auxiliary slide plate 19 in the opposite direction, thereby using the first auxiliary slide plate 19 to drive the movable rod 18 to reset. At this time, under the action of the movement of the movable rod 18, the pressing seat 14 can drive the second tooth 15 to re-engage with the first tooth 11. It is worth noting that since the first teeth 11 are equidistantly arrayed on the surface of the presser foot rod 6, the adjustment distance can be determined by observing the number of first teeth 11 covered when adjusting the presser foot slider 8, making the overall process more intuitive. Furthermore, since the right-angled surfaces of the first teeth 11 and the second teeth 15 are both right-angled trapezoids, they can effectively limit the movement when they come into contact with each other. This prevents the presser foot slider 8 from changing position during subsequent operation and provides support for the presser foot rod 6 to move longitudinally. Moreover, when the presser foot slider 8 moves to the highest adjustable position of the presser foot rod 6, only a longitudinal thrust needs to be applied to the presser foot rod 6 to adjust the longitudinal position of the presser foot slider 8 along the presser foot rod 6. At this time, the travel of the presser foot assembly can be adjusted without disassembling the disassembly cover 5, making the overall process more flexible and convenient. When adjusting the stroke of the needle body 25, the position of the locking seat 32 is pre-adjusted. At this time, it can engage with the locking grooves 36 at different positions on the surface of the rotating wheel 35. When the locking seat 32 is connected to the rotating wheel 35, the locking seat 32 will drive the locking rod 33 to engage with the locking grooves 36 on the surface of the rotating wheel 35. As the two engage, the grooves 34 arranged in a ring array along the outer ring surface of the locking rod 33 will engage with the protrusions 37 arranged in a ring array on the inner wall of the locking groove 36. The engagement of the grooves 34 and the protrusions 37 can improve the stability of the engagement between the locking rod 33 and the locking groove 36. When the pull rod 28 extends inside one end of the adjusting rod 30 When the lock rod 39 reaches the appropriate position, it moves to one side of the lock hole 38. At this point, the center lines of the two are on the same center line, which causes the pressure applied to the lock rod 39 to disappear. Since the lock rod 39 will cause the second spring 41 to deform and generate a reverse force when it is subjected to force, the reaction force generated by the deformation of the second spring 41 can easily push the second auxiliary slide plate 40 in the reverse direction when the pressure applied to the lock rod 39 disappears. Then, the movement of the second auxiliary slide plate 40 can drive the lock rod 39 to reset, thereby inputting one end of the lock rod 39 into the lock hole 38, thus realizing a stable connection between the pull rod 28 and the adjusting rod 30. When the snap-fit seat 32 moves, it will drive the extension plate 31 to slide along the slide groove 29, thereby improving the stability of the snap-fit seat 32 during movement. At the same time, as the extension plate 31 moves, the pull rod 28 will move inside the extension plate 31, thereby adjusting the distance between the two, so as to facilitate the subsequent adjustment of the needle body 25 stroke, so that it can be adapted to sewing fabrics of different thicknesses.
[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A sewing machine with an adjustable presser foot linkage structure, comprising a worktable (1), a mounting base (2) mounted on the top of the worktable (1), a machine body (3) mounted on one side of the top of the mounting base (2), a needle plate (4) mounted on the side of the top of the mounting base (2) away from the machine body (3), a disassembly cover (5) detachably mounted on the side wall of the machine body (3), and an adjustment mechanism disposed on the inner side of one end of the machine body (3), characterized in that: The adjustment mechanism includes a presser foot assembly, an adjustment assembly, and a pressure assembly; The presser foot assembly is located on the inner side of one end of the body (3); An adjustment assembly is provided on the presser foot assembly. The adjustment assembly includes a presser foot rod (6), which extends through the bottom of one end of the machine body (3). A presser foot slider (8) is sleeved on the outer side of one end of the presser foot rod (6). A first tooth (11) is fixed on the outer ring surface of the top end of the presser foot rod (6). A guide block (12) is fixed on the inner wall of the presser foot slider (8). A pressing rod (13) extends from the inner side of one end of the presser foot slider (8). A pressing seat is fixed on one end of the pressing rod (13). (14), the other end of the extrusion seat (14) is fixedly provided with a second tooth (15), the side wall of the extrusion rod (13) is provided with a guide groove (16), the end of the extrusion rod (13) away from the extrusion seat (14) is fixedly provided with a pull plate (17), the corner of the pull plate (17) is fixedly provided with a movable rod (18), the outer ring surface of one end of the movable rod (18) is fitted with a first auxiliary slide plate (19), and a first spring (20) is fixedly connected to one end surface of the first auxiliary slide plate (19). The pressure assembly is installed on one side of the top of the body (3).
2. A sewing machine with an adjustable presser foot linkage structure according to claim 1, characterized in that, The bottom of the presser foot rod (6) is fixedly provided with a presser foot body (7), the side wall of the presser foot slider (8) is fixedly provided with a sliding block (9), and a lifting hook (10) is installed on the inner wall of one end of the machine body (3).
3. A sewing machine with an adjustable presser foot linkage structure according to claim 1, characterized in that, The top of the presser foot rod (6) is provided with a slot (21), and a pressure rod (22) extends from the inside of the slot (21). A threaded connection seat (23) is fixed at the top of the pressure rod (22), and a pressure spring (24) is sleeved on the outside of the pressure rod (22).
4. A sewing machine with an adjustable presser foot linkage structure according to claim 2, characterized in that, A needle body (25) is provided on one side of the presser foot body (7). A needle rod (26) is fixed at the top of the needle body (25). A connecting block (27) is fixed on the needle rod (26). A pull rod (28) is rotatably connected to one end of the connecting block (27). A sliding groove (29) is provided on the side wall of the pull rod (28). An adjusting rod (30) is connected to the side of the pull rod (28) away from the connecting block (27). An extension plate (31) is engaged inside the sliding groove (29). A locking seat (32) is fixed at the other end of the adjusting rod (30).
5. A sewing machine with an adjustable presser foot linkage structure according to claim 4, characterized in that, The side wall of the snap-fit seat (32) is fixedly provided with a snap-fit rod (33), and the outer ring surface of the snap-fit rod (33) is provided with a groove (34). The side of the snap-fit seat (32) near the machine body (3) is connected to a rotating wheel (35), and the surface of the rotating wheel (35) is provided with a snap-fit groove (36). The inner wall of the snap-fit groove (36) is fixedly provided with a protrusion (37).
6. A sewing machine with an adjustable presser foot linkage structure according to claim 4, characterized in that, The adjusting rod (30) has a locking hole (38) on its side wall. A locking rod (39) extends from the inner side of one end of the pull rod (28). A second auxiliary sliding plate (40) is sleeved on the outer ring surface of one end of the locking rod (39). A second spring (41) is fixedly connected to one end surface of the second auxiliary sliding plate (40).
7. A sewing machine with an adjustable presser foot linkage structure according to claim 1, characterized in that, The extrusion seat (14) is slidably connected to the presser foot slider (8) via the extrusion rod (13), and the second teeth (15) are arranged in an equidistant array along the side wall of the extrusion seat (14). The cross section of the second tooth (15) is a right trapezoid.
8. A sewing machine with an adjustable presser foot linkage structure according to claim 1, characterized in that, The pull plate (17) is slidably connected to the presser foot slider (8) via the movable rod (18), and the movable rod (18) is symmetrically distributed along the vertical center line of the pull plate (17).
9. A sewing machine with an adjustable presser foot linkage structure according to claim 3, characterized in that, The outer diameter of the pressure rod (22) is adapted to the inner diameter of the slot (21), and the two ends of the pressure spring (24) are respectively connected to one end surface of the pressure foot rod (6) and the inner wall of the body (3).
10. A sewing machine with an adjustable presser foot linkage structure according to claim 6, characterized in that, The lock holes (38) are equidistantly arranged along the two side walls of the adjusting rod (30), and the inner diameter of the lock holes (38) is adapted to the outer diameter of the locking rod (39).