A presser foot bottom plate, a composite presser foot and a sewing machine
By incorporating a composite structure of filling groove and filling layer into the presser foot base plate of the sewing machine, the problem of balancing presser foot performance and lifespan is solved, achieving high-performance and long-lasting sewing results.
Patent Information
- Application Number
- CN202521219485.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-13
- Publication Date
- 2026-06-12
- Estimated Expiration
- 2035-06-13
AI Technical Summary
Existing sewing machine presser feet struggle to balance performance and lifespan. Plastic presser feet have poor wear resistance and short lifespan, while metal presser feet have high friction and are difficult to move.
A filling groove is provided on the contact surface of the presser foot base plate, and a filling layer of a different material than the base plate is installed in the filling groove, so that the bottom surface of the filling layer is located 0 to 0.2 mm below the contact surface. Combined with the vertically extending boss structure, a composite presser foot is formed.
This composite presser foot combines the performance of a plastic presser foot with the lifespan of a metal presser foot, reducing production costs and improving sewing results.
Smart Images
Figure CN224350891U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sewing machine technology, specifically to a presser foot base plate, a composite presser foot, and a sewing machine. Background Technology
[0002] With the continuous development of sewing machine technology, the presser foot, as an important component of the sewing machine, directly affects the sewing effect and the stability of the equipment in terms of its performance and lifespan.
[0003] In the existing technology, there are two main types of presser feet for sewing machines: plastic presser feet and metal presser feet. When sewing leather or similar fabrics, the metal presser foot has greater friction between the fabric and the metal presser foot, making it difficult to move. This makes the performance of the metal presser foot lower than that of the plastic presser foot. However, plastic has poor wear resistance, and since the presser foot is in direct contact with the fabric, long-term sliding friction will cause the plastic presser foot to wear out faster, resulting in a shorter service life than the metal presser foot.
[0004] Therefore, how to balance the performance and service life of the presser foot has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0005] In view of this, the purpose of this utility model is to provide a presser foot base plate to solve the technical problem that existing presser feet cannot simultaneously achieve both performance and service life.
[0006] The technical solution adopted by this utility model is as follows: a presser foot base plate, wherein a filling groove is provided on the contact surface of the presser foot base plate, and a filling layer of a different material than the presser foot base plate is provided in the filling groove. The bottom surface of the filling layer is located below the contact surface of the presser foot base plate, and the distance between the bottom surface of the filling layer and the contact surface is L, 0. <L≤0.2mm。
[0007] Preferably, the distance between the bottom surface of the filling layer and the contact surface is 0.1 mm.
[0008] Preferably, the filling groove has a vertically extending boss formed therein, the bottom surface and the contact surface of the boss are coplanar, and the filling layer is sleeved around the boss.
[0009] Preferably, the cross-section of the boss is circular.
[0010] Preferably, the plurality of protrusions are arranged in multiple rows at longitudinal intervals within the filling groove.
[0011] Preferably, the filling layer has a through hole, the boss is inserted into the through hole, and the length of the boss is smaller than the axial dimension of the through hole.
[0012] Preferably, the opening of the filling groove faces downward, and at least one of the longitudinal ends of the filling layer is a smooth curved surface.
[0013] Preferably, in the lateral direction, the smooth surface has multiple alternating peaks and troughs.
[0014] Preferably, the filling layer is bonded and fixed in the filling groove, or the filling layer is press-fitted into the filling groove.
[0015] Preferably, an adhesive backing surface is provided on the top surface of the filler layer.
[0016] Preferably, the filler layer is injection molded into the filler groove.
[0017] Preferably, the filling layer is made of one of Teflon, molybdenum-based ceramic, copper, and graphite; and the presser foot base plate is made of iron or steel.
[0018] Preferably, the area ratio of the bottom surface to the contact surface of the filling layer is 3:5 to 4:5.
[0019] The second objective of this utility model is to provide a composite presser foot, including the presser foot base plate mentioned above, and the composite presser foot also includes a presser foot handle, the bottom end of which is connected to the presser foot base plate.
[0020] The third objective of this invention is to provide a sewing machine that includes the aforementioned composite presser foot.
[0021] The beneficial effects of this utility model are:
[0022] This invention employs a composite structure, with a filling groove formed on the contact surface of the presser foot base plate. A filling layer and a boss are provided within the filling groove. The bottom surface of the boss is coplanar with the contact surface of the presser foot base plate, and the bottom surface of the filling layer is located 0-0.2mm below the contact surface of the presser foot base plate. During the sewing process, not only can the feed dog contact multiple materials simultaneously, but the fabric is also always in contact with the filling layer. This allows the composite presser foot to possess both the performance of a plastic presser foot and the service life of a metal presser foot. Furthermore, it reduces the precision requirements for the presser foot base plate, thereby lowering production costs. Attached Figure Description
[0023] Figure 1 This is a three-dimensional schematic diagram of the presser foot base plate of this utility model;
[0024] Figure 2 This is a bottom view of the presser foot base plate of this utility model;
[0025] Figure 3 This is a schematic diagram of the longitudinal section of the presser foot base plate of this utility model;
[0026] Figure 4 This is a three-dimensional schematic diagram of the presser foot base plate of this utility model after the filling layer has been removed;
[0027] Figure 5 This is a three-dimensional schematic diagram of the filling layer of this utility model;
[0028] Figure 6 This is a three-dimensional schematic diagram of the composite presser foot of this utility model;
[0029] Figure 7 This is a schematic diagram of the composite presser foot of this utility model.
[0030] Explanation of the reference numerals in the figure:
[0031] 10. Presser foot sole;
[0032] 11. Contact surface; 12. Filling groove; 13. Filling layer; 14. Boss; 15. Through hole; 16. Front guide plate; 17. Rear guide plate;
[0033] 20. Presser foot handle;
[0034] 30. Presser foot pin;
[0035] 40. Spring. Detailed Implementation
[0036] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.
[0037] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0039] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0040] Examples, such as Figures 1-7 As shown, a presser foot base plate has a filling groove 12 on the contact surface 11 of the presser foot base plate 10. A filling layer 13 of a different material from the presser foot base plate 10 is disposed within the filling groove 12. The bottom surface of the filling layer 13 is located below the contact surface 11 of the presser foot base plate 10, and the distance between the bottom surface of the filling layer 13 and the contact surface 11 is L. <L≤0.2mm。
[0041] This utility model adopts a composite structure. A filling groove 12 is provided on the contact surface 11 of the presser foot base plate 10, and a filling layer 13 is installed in the filling groove 12. The bottom surface of the filling layer 13 is located 0 to 0.2 mm below the contact surface 11 of the presser foot base plate 10. During the sewing process, not only can the feed dog contact multiple materials at the same time, but the fabric is always in contact with the filling layer 13. This allows the composite presser foot to have the performance of a plastic presser foot and the service life of a metal presser foot at the same time. It can also reduce the processing precision requirements of the presser foot base plate 10, thereby reducing production costs.
[0042] It should be noted that in this utility model, the contact surface 11 of the presser foot plate 10 refers to the surface of the presser foot plate 10 that contacts the fabric during the sewing process, that is, the bottom surface of the presser foot plate 10.
[0043] In this utility model, the lateral direction refers to Figure 2 The double arrows in the image refer to the vertical direction. Figure 2 The direction of the single arrow in the image.
[0044] Specific embodiment 1, such as Figures 1-5 As shown, a presser foot base plate has a filling groove 12 on the contact surface 11 of the presser foot base plate 10. Multiple bosses 14 are formed within the filling groove 12, extending vertically, with their bottom surfaces coplanar with the contact surface 11. A filling layer 13, made of a different material than the presser foot base plate 10, is provided within the filling groove 12. The filling layer 13 is fitted around the periphery of the bosses 14, with its bottom surface located below the contact surface 11 of the presser foot base plate 10, and the distance between the bottom surface of the filling layer 13 and the contact surface 11 is L. <L≤0.2mm。
[0045] Preferably, the cross-section of the boss 14 is circular, that is, the boss 14 is a cylinder, and the top of the cylinder is integrally formed with the presser foot base plate 10.
[0046] Specifically, there are multiple bosses 14, which are spaced apart in the filling groove 12 and form multiple rows of bosses 14. The adjacent rows of bosses 14 are arranged longitudinally at intervals so that each row of bosses 14 contacts different teeth of the feed dog during the sewing operation.
[0047] More preferably, the presser foot base plate 10 is made of iron, the filling layer 13 is made of Teflon, and the filling layer 13 is formed in the filling groove 12 by injection molding.
[0048] Specific embodiment 2, such as Figures 1-5 As shown, a presser foot base plate has a downward-opening filling groove 12 on the contact surface 11 of the presser foot base plate 10. Multiple bosses 14 are formed within the filling groove 12, extending vertically, with their bottom surfaces coplanar with the contact surface 11. A filling layer 13, made of a different material than the presser foot base plate 10, is provided within the filling groove 12. Through holes 15 are formed in the filling layer 13, which is fitted around the periphery of the bosses 14 through the through holes 15. The axial dimension of the through holes 15 is larger than the vertical dimension of the bosses 14, creating a hollow structure at the bottom of the presser foot base plate 10. The bottom surface of the filling layer 13 is located below the contact surface 11 of the presser foot base plate 10, and the distance between the bottom surface of the filling layer 13 and the contact surface 11 is 0.1 mm.
[0049] Preferably, the presser foot base plate 10 is made of steel, the filling layer 13 is made of copper and graphite, and the filling layer 13 is press-fitted into the filling groove 12.
[0050] More preferably, the longitudinal ends or one longitudinal end of the filling layer 13 are smooth curved surfaces, and in the transverse direction, the smooth curved surfaces have multiple alternating peaks and troughs.
[0051] This design is because the ends of the filling layer 13 that contact the presser foot base plate 10 at both longitudinal ends are arc-shaped. Compared with structures with sharp corners such as rhombuses or squares, this design can effectively prevent the fabric from being caught on sharp corners, causing the fabric to jam or be damaged.
[0052] Specific embodiment 3, such as Figures 1-5 As shown, a presser foot base plate has a filling groove 12 formed on the contact surface 11 of the presser foot base plate 10. Multiple bosses 14 are formed in the filling groove 12. The bosses 14 extend in the vertical direction and the bottom surface of the bosses 14 is coplanar with the contact surface 11. A filling layer 13 of a different material than the presser foot base plate 10 is provided in the filling groove 12. The filling layer 13 is sleeved on the periphery of the bosses 14. The bottom surface of the filling layer 13 is located below the contact surface 11 of the presser foot base plate 10, and the distance between the bottom surface of the filling layer 13 and the contact surface 11 is 0.15mm.
[0053] Preferably, the presser foot base plate 10 is made of iron, and the filling layer 13 is made of molybdenum-based ceramic, or other self-lubricating materials, and the filling layer 13 is bonded and fixed in the filling groove 12.
[0054] Specifically, an adhesive backing is provided on the top surface of the filling layer 13, which is in close contact with the top surface of the filling groove 12 so that the filling layer 13 is bonded and fixed in the filling groove 12.
[0055] Specific embodiment 4, such as Figures 1-5 As shown, a presser foot base plate has a downward-opening filling groove 12 on the contact surface 11 of the presser foot base plate 10. Multiple bosses 14 are formed in the filling groove 12, which extend vertically and whose bottom surfaces are coplanar with the contact surface 11. A filling layer 13 of a different material than the presser foot base plate 10 is provided in the filling groove 12. The filling layer 13 is fitted around the bosses 14, and its bottom surface is located below the contact surface 11 of the presser foot base plate 10. The distance between the bottom surface of the filling layer 13 and the contact surface 11 is 0.05 mm.
[0056] Preferably, the area ratio of the bottom surface of the filling layer 13 to the contact surface 11 of the presser foot base plate 10 is 3:5 to 4:5, that is, the bottom surface area of the filling layer 13 is 60% to 80% of the bottom surface area of the presser foot base plate 10.
[0057] More preferably, a front guide plate 16 is integrally formed at one lateral end of the presser foot base plate 10, and a rear guide plate 17 is integrally formed at the other lateral end of the presser foot base plate 10. The two ends of the filling groove 12 extend laterally to the front guide plate 16 and the rear guide plate 17.
[0058] Specific embodiment 5, such as Figure 6 and Figure 7 As shown, a composite presser foot includes the aforementioned presser foot base plate 10, presser foot handle 20, presser foot pin 30, and spring 40. The presser foot handle 20 is arranged vertically. The presser foot base plate 10 is made of steel and is arranged horizontally directly below the presser foot handle 20. The bottom end of the presser foot handle 20 is rotatably connected to the presser foot base plate 10 via the presser foot pin 30. The spring 40 is arranged on one side of the presser foot pin 30 and is installed vertically between the presser foot handle 20 and the presser foot base plate 10.
[0059] An example is a sewing machine that includes the aforementioned composite presser foot.
[0060] The working principle of the presser foot base plate of this utility model is as follows:
[0061] The bottom surface of the filling layer 13 is located below the contact surface 11 of the presser foot base plate 10. As the usage time increases, the filling layer 13, under the pressure of the feed teeth, gradually sinks and becomes flush with the presser foot base plate 10. Then, the filling layer 13 and the contact surface 11 of the presser foot base plate 10 work together to prevent the filling layer 13 from sinking further. The filling layer 13, which is not under the pressure of the feed teeth, sinks slowly. For a long time, the filling layer 13, which is higher than the contact surface 11 of the presser foot base plate 10, is in contact with the fabric, which can improve the sewing effect. At the same time, from a process perspective, since the filling layer 13 is fixed in the filling groove 12 on the presser foot base plate 10, and the bottom surface of the filling layer 13 is below the contact surface 11 of the presser foot base plate 10, the processing precision requirements of the presser foot base plate 10 can also be reduced.
[0062] Compared with the prior art, the present invention has at least the following beneficial technical effects:
[0063] This application adopts a composite structure, in which different materials are distributed in proportion on the side of the presser foot base plate that contacts the sewing material / feed dog, so that the feed dog can contact multiple materials at the same time, ensuring that the composite presser foot has a long service life and better performance.
[0064] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A presser foot base plate, characterized in that, A filling groove (12) is provided on the contact surface (11) of the presser foot base plate (10). A filling layer (13) of a different material than the presser foot base plate (10) is provided in the filling groove (12). The bottom surface of the filling layer (13) is located below the contact surface (11) of the presser foot base plate (10), and the distance between the bottom surface of the filling layer (13) and the contact surface (11) is L. <L≤0.2mm。 2. The presser foot base plate according to claim 1, characterized in that, The distance between the bottom surface of the filling layer (13) and the contact surface (11) is 0.1 mm.
3. The presser foot base plate according to claim 1, characterized in that, The filling groove (12) has a vertically extending boss (14) formed inside. The bottom surface of the boss (14) and the contact surface (11) are coplanar, and the filling layer (13) is sleeved on the periphery of the boss (14).
4. A presser foot base plate according to claim 3, characterized in that, The cross-section of the boss (14) is circular.
5. A presser foot base plate according to claim 3, characterized in that, Multiple bosses (14) are arranged in multiple rows at longitudinal intervals within the filling groove (12).
6. A presser foot base plate according to claim 3, characterized in that, The filling layer (13) has a through hole (15), and the boss (14) passes through the through hole (15), and the length of the boss (14) is smaller than the axial dimension of the through hole (15).
7. A presser foot base plate according to claim 1, characterized in that, The opening of the filling groove (12) faces downward, and at least one of the longitudinal ends of the filling layer (13) is a smooth curved surface.
8. A presser foot base plate according to claim 7, characterized in that, In the lateral direction, the smooth surface has multiple alternating peaks and troughs.
9. A presser foot base plate according to claim 1, characterized in that, The filling layer (13) is bonded and fixed in the filling groove (12), or the filling layer (13) is pressed into the filling groove (12).
10. A presser foot base plate according to claim 9, characterized in that, An adhesive backing surface is provided on the top surface of the filler layer (13).
11. A presser foot base plate according to claim 1, characterized in that, The filler layer (13) is injection molded into the filler groove (12).
12. A presser foot base plate according to claim 1, characterized in that, The filling layer (13) is made of one of Teflon, molybdenum-based ceramic, copper and graphite; the presser foot base plate (10) is made of iron or steel.
13. A presser foot base plate according to claim 1, characterized in that, The area ratio of the bottom surface to the contact surface (11) of the filling layer (13) is 3:5 to 4:
5.
14. A composite presser foot, comprising the presser foot base plate according to any one of claims 1-13, characterized in that, The composite presser foot also includes a presser foot handle (20), the bottom end of which is connected to the presser foot base plate (10).
15. A sewing machine, characterized in that, Includes the composite presser foot as described in claim 14.