Presser foot assembly of sewing machine

Abstract

The invention provides a sewing machine presser foot assembly, which belongs to the technical field of sewing equipment and comprises a connecting handle, a flat foot, a thread guide groove and a sliding sleeve. The end, facing the cloth feeding direction, of the flat foot is arranged to be an arc face, one end of the flat foot is connected with an arc plate, the center axis of the arc plate coincides with the center axis of the arc face, the sliding sleeve is connected to the connecting handle, and a guide groove matched with the arc plate is formed in the sliding sleeve. And one side of the sliding sleeve is in threaded connection with a second locking bolt which is used for releasing or locking the arc-shaped plate. The arc-shaped plate is arranged, and the rotating axis of the arc-shaped plate is consistent with the center axis of the arc surface of the end, facing the cloth feeding direction, of the flat foot, so that when the arc-shaped plate slides and rotates, the flat foot and the arc-shaped plate rotate around the center axis of the arc surface, the height of the end, facing the arc surface, of the flat foot is not changed, and after adjustment is completed, the mounting height of the presser foot does not need to be adjusted; and the cloth pressing precision is ensured.

Description

Technical Field

[0001] This invention belongs to the field of sewing equipment technology, specifically referring to a sewing machine presser foot assembly. Background Technology

[0002] A sewing machine presser foot is a component mounted directly above the needle plate. During operation, it uses the pressure of the sewing head to hold the fabric firmly against the feed dogs, ensuring the fabric remains stable and doesn't lift randomly as the needle pierces and rises, thus creating even and flat stitches. Presser feet have extremely diverse functions, ranging from the most common "multi-functional presser feet" to special presser feet designed for zippers, buttons, and piping. They guide, hold, or decorate fabric through different bottom shapes and openings.

[0003] In the current multi-functional presser foot wrinkling solution, the presser foot is adjusted to a specific tilt angle using a bolt structure, creating a gap on the side facing away from the incoming fabric. This gap obstructs the normal fabric feed during needle movement, thus forcing the formation of uniform wrinkles. However, because the overall tilt of the presser foot changes its relative position to the needle plate, the initial pressing height is lost, affecting pressing stability. Therefore, after tilting, the installation height of the presser foot needs further adaptive adjustment to restore its standard pressing height. This function switching is time-consuming, and accuracy is difficult to guarantee. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a sewing machine presser foot assembly to at least partially solve the problems mentioned in the background art.

[0005] The technical solution adopted by this invention is as follows: This invention proposes a sewing machine presser foot assembly, comprising: The connecting handle has a flat foot attached to its bottom; The flat foot is provided with a lead wire groove; The flat foot has an arc-shaped end facing the fabric direction, the diameter of which is the same as the thickness of the flat foot. One end of the flat foot is connected to an arc-shaped plate, which is configured such that its central axis coincides with the central axis of the arc-shaped surface. A sliding sleeve is connected to the connecting handle and has a guide groove inside that is adapted to the arc-shaped plate. The arc-shaped plate is slidably connected in the guide groove. A second locking bolt is threaded to one side of the sliding sleeve and extends into the guide groove for releasing or locking the arc-shaped plate.

[0006] Furthermore, pins are rotatably connected to both sides of the end of the flat foot facing the direction of the fabric, and the pins are configured to rotate around the axis of the arc surface.

[0007] Furthermore, the thickness of the pin is the same as the thickness of the flat foot.

[0008] Furthermore, two adjustment units corresponding to the pins are installed on the flat foot, and the adjustment units are configured to adjust the angle of the pins.

[0009] Furthermore, the adjustment unit includes a spring and a limiting sleeve. The limiting sleeve is fixed to the pin, one end of the spring is fixed to the flat foot, and the other end of the spring extends to the pin and is slidably connected inside the limiting sleeve. The spring is configured to apply an upward rotational elastic force to the pin.

[0010] Furthermore, the adjustment unit also includes a bolt seat, which is fixed to the flat foot, and an adjustment bolt for pushing the pin to rotate is threaded onto the bolt seat.

[0011] Furthermore, a slide rail is fixedly connected to the bottom of the connecting handle, a horizontal slide groove is provided on the slide rail, a slider is slidably connected in the slide groove, and the sliding sleeve is connected to the slider.

[0012] Furthermore, a first locking bolt is threaded onto the slider, the first locking bolt being configured to release or lock the slider.

[0013] Furthermore, a hinge is provided between the slider and the sliding sleeve, and the slider and the sliding sleeve are connected by the hinge, so that the sliding sleeve can rotate relative to the slider.

[0014] Furthermore, multiple springs are provided between the slider and the sliding sleeve.

[0015] Beneficial effects: 1. By setting an arc-shaped plate, and since the rotation axis of the arc-shaped plate is consistent with the central axis of the arc surface of the flat foot facing the direction of the fabric, when the arc-shaped plate slides and rotates, the flat foot and the arc-shaped plate rotate around the central axis of the arc surface. The height of the arc surface of the flat foot remains unchanged. After the adjustment is completed, there is no need to adjust the installation height of the presser foot to ensure the fabric pressing accuracy.

[0016] 2. By setting a rotatable pin, when the flat foot rotates upward to switch to the wrinkling state, the pin is pushed downward by adjusting the bolt and rotated to a horizontal state. At this time, the pin acts as a fabric pressure point, so that after the flat foot is tilted to switch to the wrinkling state, it can still obtain a sufficient fabric pressure area through the pin. Moreover, when the pin is rotated to a horizontal state, the fabric pressure height remains unchanged, ensuring sewing accuracy. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of a sewing machine presser foot assembly according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the sliding sleeve in a sewing machine presser foot assembly according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the installation position of the first locking bolt in a sewing machine presser foot assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram showing the flat foot of a sewing machine presser foot assembly in a horizontal state according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a sewing machine presser foot assembly in an inclined and wrinkled state according to an embodiment of the present invention; Figure 6 This is a schematic diagram showing the installation positions of the spring and hinge in a sewing machine presser foot assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the adjustment unit in a sewing machine presser foot assembly according to an embodiment of the present invention.

[0018] Among them, 1. Connecting handle; 11. Slide rail; 101. Slide groove; 12. Slider; 13. First locking bolt; 14. Spring; 2. Flat foot; 201. Lead wire groove; 202. Arc surface; 203. Guide groove; 21. Sliding sleeve; 22. Arc plate; 23. Second locking bolt; 24. Pin; 3. Adjustment unit; 31. Spring piece; 32. Limiting sleeve; 33. Bolt seat; 34. Adjusting bolt; 4. Hinge.

[0019] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below 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, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0021] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0022] Combination Figure 1 As shown, this embodiment of the invention provides a sewing machine presser foot assembly, including a connecting handle 1 and a flat foot 2. The flat foot 2 is provided with a thread guide groove 201, through which the sewing machine needle and sewing thread pass.

[0023] The end of the flat foot 2 facing the direction of the fabric is set as an arc surface 202, thereby reducing the friction on the fabric and avoiding damage to the fabric by sharp corners. The diameter of the arc surface 202 is the same as the thickness of the flat foot 2, so that the end of the flat foot 2 forms a semi-circular profile, and the central axis of the arc surface 202 is located on the middle surface of the thickness of the flat foot 2.

[0024] Combination Figure 1 and Figure 2 As shown, one end of the flat foot 2 is connected to an arc-shaped plate 22. The arc-shaped plate 22 is configured such that its central axis coincides with the central axis of the arc surface 202. A sliding sleeve 21 is connected to the connecting handle 1. A guide groove 203 is provided inside the sliding sleeve 21. The guide groove 203 is arc-shaped and its shape matches that of the arc-shaped plate 22. The arc-shaped plate 22 is slidably connected within the guide groove 203 (e.g., ...). Figure 4 (As shown).

[0025] By sliding the arc plate 22 along the sliding sleeve 21, the angle of the flat foot 2 is adjusted. Since the rotation axis of the arc plate 22 is consistent with the central axis of the arc surface 202 of the flat foot 2 facing the direction of the fabric, when the arc plate 22 slides and rotates, the flat foot 2 and the arc plate 22 rotate around the central axis of the arc surface 202. When the flat foot 2 rotates upward, one end of the arc surface 202 of the flat foot 2 is the lowest end, and the height remains unchanged.

[0026] Thus, when it is necessary to rotate the flat foot 2 upwards to switch to the wrinkling state, the angle of the flat foot 2 is adjusted by sliding the curved plate 22 upwards along the sliding sleeve 21, so that a wrinkling gap is formed at the end of the flat foot 2 facing away from the incoming fabric (e.g. Figure 5 As shown in the figure, since the rotation axis of the arc plate 22 is consistent with the central axis of the arc surface 202 of the flat foot 2 facing the direction of the fabric, when the arc plate 22 slides and rotates, the flat foot 2 and the arc plate 22 rotate around the central axis of the arc surface 202. The height of one end of the arc surface 202 of the flat foot 2 remains unchanged. After the adjustment is completed, it is not necessary to adjust the installation height of the presser foot to ensure the fabric pressing accuracy.

[0027] Furthermore, a second locking bolt 23 is threadedly connected to one side of the sliding sleeve 21. The second locking bolt 23 extends into the guide groove 203. When the second locking bolt 23 is screwed into the guide groove 203, the second locking bolt 23 can press the arc plate 22, thereby locking the arc plate 22. When the second locking bolt 23 is screwed out, the second locking bolt 23 disengages from the arc plate 22, thereby releasing the arc plate 22.

[0028] Thus, when the arc plate 22 needs to slide, the second locking bolt 23 is screwed outward to release the arc plate 22, making the arc plate 22 slidable. When the arc plate 22 does not need to slide, the second locking bolt 23 is screwed into the guide groove 203 to press the arc plate 22, thereby locking the arc plate 22.

[0029] Combination Figure 1 and Figure 3 As shown, pins 24 are rotatably connected to both sides of the end of the flat foot 2 facing the fabric feeding direction. The pins 24 are configured to rotate around the axis of the arc surface 202. Therefore, the angle between the pins 24 and the flat foot 2 can be adjusted. When the flat foot 2 is in a horizontal position pressing the fabric, the pins 24 can be adjusted to an upward tilted position (e.g., ...). Figure 4 As shown), at this time, the inclined pin 24 can be used to gradually flatten the fabric during the feeding process.

[0030] In a specific embodiment, the thickness of pin 24 is the same as the thickness of flat foot 2, and the rotation axis of pin 24 is located on the middle surface of its thickness. Since pin 24 rotates around the axis of arc surface 202, the rotation axis of pin 24 coincides with the axis of arc surface 202, so that when pin 24 is rotated to a horizontal state, its bottom height is the same as the bottom height of flat foot 2.

[0031] Thus, when flat foot 2 rotates upward to switch to the wrinkled state, pin 24 is also rotated downward to the horizontal state (as shown). Figure 5 As shown), at this time, pin 24 acts as a fabric presser, so that after the flat foot 2 is tilted and switched to the wrinkling state, it can still obtain a sufficient fabric presser area through pin 24. When pin 24 is rotated to the horizontal state, the fabric presser height remains unchanged, ensuring sewing accuracy.

[0032] Combination Figure 1 and Figure 7 As shown, two adjustment units 3 are installed on the flat foot 2, each corresponding to pin 24, and the adjustment units 3 are configured to adjust the angle of pin 24.

[0033] In a specific embodiment, the adjustment unit 3 includes a spring piece 31 and a limiting sleeve 32. The limiting sleeve 32 is fixed on the pin 24. One end of the spring piece 31 is fixed on the flat foot 2, and the other end of the spring piece 31 extends to the pin 24 and is slidably connected in the limiting sleeve 32. The spring piece 31 is configured to apply an upward rotational elastic force to the pin 24. When the pin 24 rotates downward, the spring piece 31 deforms and stores force, so that the pin 24 always has an upward tendency.

[0034] Furthermore, the adjustment unit 3 also includes a bolt seat 33, which is fixed on the flat foot 2. The bolt seat 33 is threaded with an adjustment bolt 34 for pushing the pin 24 to rotate. By rotating the adjustment bolt 34, the adjustment bolt 34 moves towards the pin 24, pushing the pin 24 downward. When the adjustment bolt 34 moves away from the pin 24, the pin 24 rotates upward under the action of the spring piece 31.

[0035] Thus, when the flat foot 2 rotates upward to switch to the wrinkled state, the adjusting bolt 34 pushes the pin 24 downward to rotate it to a horizontal state (as shown). Figure 5 As shown), at this time, pin 24 acts as a pressure point, so that after the flat foot 2 is switched from tilt to wrinkling state, it can still obtain a sufficient pressure area through pin 24. When pin 24 is rotated to the horizontal state, the pressure height remains unchanged to ensure sewing accuracy. When the flat foot 2 is in the horizontal state, the adjusting bolt 34 is moved away from pin 24. Under the action of spring 31, pin 24 rotates upward and returns to the tilted state.

[0036] Combination Figure 1 and Figure 3 As shown, a slide rail 11 is fixedly connected to the bottom of the connecting handle 1. A horizontal slide groove 101 is provided on the slide rail 11. A slider 12 is provided in the slide groove 101. The slider 12 can slide horizontally along the slide groove 101. The sliding sleeve 21 is connected to the slider 12. Therefore, by sliding the slider 12 horizontally, the flat foot 2 can also move horizontally synchronously.

[0037] Thus, by moving the flat foot 2 horizontally, the flat foot 2 can be moved to both sides of the needle, at which point the flat foot 2 can be used as a single presser foot.

[0038] Furthermore, a first locking bolt 13 is threaded onto the slider 12. The first locking bolt 13 passes through the slide groove 101, and the head diameter of the first locking bolt 13 is larger than the width of the slide groove 101 (e.g., Figure 3 As shown, when the first locking bolt 13 is screwed into the slider 12, the head of the first locking bolt 13 can press against the slide rail 11, thereby locking the slider 12 and fixing the position of the flat foot 2. Correspondingly, when the first locking bolt 13 is loosened, the slider 12 can slide along the slide groove 101 to adjust the position of the flat foot 2.

[0039] Combination Figure 6 As shown, a hinge 4 is provided between the slider 12 and the sliding sleeve 21. The slider 12 and the sliding sleeve 21 are connected by the hinge 4, so that the sliding sleeve 21 can rotate relative to the slider 12. Correspondingly, the flat foot 2 can also rotate.

[0040] In this way, during the fabric feeding process, the flat foot 2 can tilt up and down to adapt to changes in fabric thickness.

[0041] Furthermore, multiple springs 14 are provided between the slider 12 and the sliding sleeve 21. When the flat foot 2 is tilted, the elastic resistance of the springs 14 needs to be overcome so that the flat foot 2 can apply elastic downward pressure to the fabric, thereby pressing the fabric firmly to prevent loosening during the sewing process and ensuring sewing accuracy.

[0042] The working principle of this invention is as follows: When it is necessary to rotate the flat foot 2 upwards to switch to the wrinkling state, first unscrew the second locking bolt 23 outwards to release the arc plate 22. By sliding the arc plate 22 upwards along the sliding sleeve 21, the angle of the flat foot 2 is adjusted so that a wrinkling gap is formed at the end of the flat foot 2 facing away from the incoming fabric direction (e.g., Figure 5 As shown), after adjustment, screw the second locking bolt 23 into the guide groove 203 to press the arc plate 22 and lock it. Since the rotation axis of the arc plate 22 is consistent with the central axis of the arc surface 202 of the flat foot 2 facing the direction of the fabric, when the arc plate 22 slides and rotates, the flat foot 2 and the arc plate 22 rotate around the central axis of the arc surface 202. The height of one end of the arc surface 202 of the flat foot 2 remains unchanged. After adjustment, there is no need to adjust the installation height of the presser foot to ensure the fabric pressing accuracy.

[0043] When the flat foot 2 rotates upward to switch to the wrinkled state, the adjusting bolt 34 pushes the pin 24 downward to rotate it to a horizontal state (as shown). Figure 5 As shown), at this time, pin 24 acts as a pressure point, so that after the flat foot 2 is switched from tilt to wrinkling state, it can still obtain a sufficient pressure area through pin 24. When pin 24 is rotated to the horizontal state, the pressure height remains unchanged to ensure sewing accuracy. When the flat foot 2 is in the horizontal state, the adjusting bolt 34 is moved away from pin 24. Under the action of spring 31, pin 24 rotates upward and returns to the tilted state.

[0044] By loosening the first locking bolt 13, the slider 12 can slide along the slide groove 101, allowing the flat foot 2 to move horizontally in sync. By moving the flat foot 2 horizontally, the flat foot 2 can be moved to both sides of the needle. At this time, the flat foot 2 can be used as a single presser foot. After adjustment, the first locking bolt 13 is screwed into the slider 12, and the head of the first locking bolt 13 can be pressed against the slide rail 11, thereby locking the slider 12 and fixing the position of the flat foot 2.

[0045] The slider 12 and the sliding sleeve 21 are connected by a hinge 4, and multiple springs 14 are provided between the slider 12 and the sliding sleeve 21, so that the sliding sleeve 21 can rotate relative to the slider 12. Correspondingly, the flat foot 2 can also rotate. During the fabric feeding process, the flat foot 2 can pitch up and down to adapt to changes in fabric thickness. At the same time, when the flat foot 2 is pitched up and down, it is necessary to overcome the elastic resistance of the springs 14 so that the flat foot 2 can apply elastic downward pressure to the fabric, thereby pressing the fabric firmly to prevent loosening during sewing and ensuring sewing accuracy.

[0046] In summary, by setting up the arc plate 22, and since the rotation axis of the arc plate 22 is consistent with the central axis of the arc surface 202 of the flat foot 2 facing the direction of fabric feeding, when the arc plate 22 slides and rotates, the flat foot 2 and the arc plate 22 rotate around the central axis of the arc surface 202, and the height of one end of the arc surface 202 of the flat foot 2 remains unchanged. After the adjustment is completed, it is not necessary to adjust the installation height of the presser foot to ensure the fabric pressing accuracy.

[0047] By setting a rotatable pin 24, when the flat foot 2 rotates upward to switch to the wrinkled state, the adjusting bolt 34 pushes the pin 24 downward to rotate it to a horizontal state (e.g., Figure 5 As shown), at this time, pin 24 acts as a fabric presser, so that after the flat foot 2 is tilted and switched to the wrinkling state, it can still obtain a sufficient fabric presser area through pin 24. When pin 24 is rotated to the horizontal state, the fabric presser height remains unchanged, ensuring sewing accuracy.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A sewing machine presser foot assembly, characterized in that, include: Connecting handle (1), with a flat foot (2) attached to its bottom; The flat foot (2) is provided with a lead wire groove (201); Wherein, the end of the flat foot (2) facing the direction of the fabric is set as an arc surface (202), the diameter of the arc surface (202) is the same as the thickness of the flat foot (2), and one end of the flat foot (2) is connected to an arc plate (22), the arc plate (22) is configured such that its central axis coincides with the central axis of the arc surface (202); A sliding sleeve (21) is connected to the connecting handle (1) and has a guide groove (203) inside that is adapted to the arc plate (22). The arc plate (22) is slidably connected in the guide groove (203). A second locking bolt (23) is threadedly connected to one side of the sliding sleeve (21). The second locking bolt (23) extends into the guide groove (203) and is used to release or lock the arc plate (22).

2. The sewing machine presser foot assembly according to claim 1, characterized in that: The flat foot (2) has pins (24) rotatably connected to both sides of the end facing the fabric direction, and the pins (24) are configured to rotate around the axis of the arc surface (202).

3. The sewing machine presser foot assembly according to claim 2, characterized in that: The thickness of the pin (24) is the same as the thickness of the flat foot (2).

4. The sewing machine presser foot assembly according to claim 2, characterized in that: Two adjustment units (3) are installed on the flat foot (2) respectively corresponding to the pin (24), and the adjustment unit (3) is configured to adjust the angle of the pin (24).

5. The sewing machine presser foot assembly according to claim 4, characterized in that: The adjustment unit (3) includes a spring (31) and a limiting sleeve (32). The limiting sleeve (32) is fixed on the pin (24). One end of the spring (31) is fixed on the flat foot (2). The other end of the spring (31) extends to the pin (24) and is slidably connected inside the limiting sleeve (32). The spring (31) is configured to apply an upward rotational elastic force to the pin (24).

6. The sewing machine presser foot assembly according to claim 5, characterized in that: The adjustment unit (3) also includes a bolt seat (33), which is fixed on the flat foot (2). An adjustment bolt (34) for pushing the pin (24) to rotate is threaded onto the bolt seat (33).

7. The sewing machine presser foot assembly according to claim 1, characterized in that: The bottom of the connecting handle (1) is fixedly connected to a slide rail (11), and a horizontal slide groove (101) is provided on the slide rail (11). A slider (12) is slidably connected in the slide groove (101), and the sliding sleeve (21) is connected to the slider (12).

8. The sewing machine presser foot assembly according to claim 7, characterized in that: The slider (12) is threaded with a first locking bolt (13), which is configured to release or lock the slider (12).

9. The sewing machine presser foot assembly according to claim 7, characterized in that: A hinge (4) is provided between the slider (12) and the sleeve (21), and the slider (12) and the sleeve (21) are connected by the hinge (4), so that the sleeve (21) can rotate relative to the slider (12).

10. The sewing machine presser foot assembly according to claim 9, characterized in that: Multiple springs (14) are provided between the slider (12) and the sleeve (21).

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