CN221421364U - Presser foot bottom plate, compound presser foot and sewing machine - Google Patents

Abstract

The utility model discloses a presser foot bottom plate, a composite presser foot and a sewing machine, which belong to the technical field of sewing machines. According to the utility model, a composite structure is adopted, and different materials are distributed on the bottom surface of the presser foot base plate in proportion, so that the feeding teeth can be contacted with various materials at the same time, and the composite presser foot is ensured to have longer service life and better performance.

Description

Presser foot bottom plate, compound presser foot and sewing machine

Technical Field

The utility model relates to the technical field of sewing machines, in particular to a presser foot base plate, a composite presser foot and a sewing machine.

Background

In the prior art, the presser foot of the sewing machine is mainly two types, one is a plastic presser foot and the other is a metal presser foot; when leather cloth is sewn, the friction force between the cloth and the metal presser foot is large, the metal presser foot is difficult to move, the service performance of the metal presser foot is lower than that of the plastic presser foot, but the wear resistance of plastic is poor, the presser foot is directly contacted with the cloth, long-term sliding friction can lead to high wear speed of the plastic presser foot, and the service life of the plastic presser foot is shorter than that of the metal presser foot.

Therefore, how to consider the service performance and service life of the presser foot is a technical problem to be solved by the person skilled in the art.

Disclosure of utility model

Accordingly, the present utility model is directed to a presser foot sole, a composite presser foot, and a sewing machine, which solve the technical problem that the usability and the service life of the existing presser foot cannot be considered.

The technical scheme adopted by the utility model is as follows: the utility model provides a presser foot bottom plate, be equipped with the filling groove on the working face of presser foot bottom plate, be equipped with the filling layer that the material is different from the presser foot bottom plate in the filling groove, the bottom surface of filling layer and the working face coplane of presser foot bottom plate.

Preferably, the filling groove is internally provided with a boss extending vertically, the bottom surface of the boss and the working surface of the presser foot bottom plate are coplanar, and the filling layer and the boss are alternately arranged along the longitudinal direction and/or the transverse direction.

Preferably, the cross section of the boss is diamond, rectangular or circular.

Preferably, the bosses are linearly arranged in the filling grooves in a plurality of rows, and two adjacent rows of bosses are arranged in a staggered manner.

Preferably, the plurality of elongated bosses are arranged at a transverse interval or a longitudinal interval, and the bosses and the presser foot bottom plate are integrally formed.

Preferably, the area ratio of the bottom surfaces of the filling layer and the boss is 3:2-4:1.

Preferably, the material of the filling layer is one of polytetrafluoroethylene, molybdenum-based ceramic, copper and graphite; the presser foot bottom plate is made of iron or steel.

Preferably, the filling layer is adhesively secured in the filling slot or the filling layer is mounted in the filling slot.

Preferably, the filling layer is injection molded in the filling groove.

Preferably, an upper groove is formed in the upper surface of the presser foot bottom plate, and the upper groove is communicated with the filling groove through a vertical connecting hole, so that the longitudinal section of the filling layer is I-shaped.

Preferably, the two transverse ends of the presser foot bottom plate are correspondingly provided with a front guide plate and a rear guide plate, and the two ends of the filling groove transversely extend to the front guide plate and the rear guide plate.

The second object of the present utility model is to provide a composite presser foot, comprising the presser foot base plate and the presser foot handle, wherein the bottom end of the presser foot handle is connected with the presser foot base plate.

A third object of the present utility model is to provide a sewing machine, including the above-mentioned composite presser foot, wherein the sewing machine further includes a feeding tooth, the feeding tooth is disposed under the presser foot base plate of the composite presser foot, and the working area of the feeding tooth can simultaneously contact with the bottom surface of the filling layer and the working surface of the presser foot base plate along the longitudinal direction and/or the transverse direction.

Preferably, a plurality of rows of feeding teeth are arranged in the transverse space of the working area of the feeding teeth, and each row of feeding teeth can be simultaneously contacted with the bottom surface of the filling layer and the working surface of the presser foot bottom plate along the longitudinal direction; or alternatively

And a plurality of rows of feeding teeth are arranged in the longitudinal space of the working area of the feeding teeth, and each row of feeding teeth can be simultaneously contacted with the bottom surface of the filling layer and the working surface of the presser foot bottom plate along the transverse direction.

Preferably, the working area of the feeding teeth is provided with a plurality of feeding teeth, and each feeding tooth can be simultaneously contacted with the bottom surface of the filling layer and the working surface of the presser foot bottom plate along the longitudinal direction or the transverse direction.

The utility model has the beneficial effects that:

The utility model adopts a composite structure, the working surface of the presser foot bottom plate is formed with the filling groove, the filling groove is internally provided with the filling layer and the boss which are transversely and/or longitudinally alternated, and the bottom surfaces of the filling layer and the boss are coplanar with the working surface of the presser foot bottom plate, so that the feeding teeth can be always contacted with various materials in the sewing process, and the composite presser foot can have the service performance of the plastic presser foot and the service life of the metal presser foot.

Drawings

FIG. 1 is a schematic perspective view of a composite presser foot of the utility model;

FIG. 2 is a schematic view of the structure of the composite presser foot of the utility model;

FIG. 3 is a schematic perspective view of a footpad of the present utility model;

FIG. 4 is a schematic perspective view of the present utility model with the filler layer removed from the footplate;

FIG. 5 is a schematic longitudinal cross-sectional view of the footpad of the present utility model;

FIG. 6 is one of the bottom views of the footpad of the present utility model;

FIG. 7 is a second bottom view of the presser foot sole plate of the utility model;

FIG. 8 is a bottom view of a third of the footpad of the present utility model;

FIG. 9 is a fourth bottom view of the presser foot sole plate of the utility model;

FIG. 10 is a fifth bottom view of the presser foot sole plate of the utility model;

FIG. 11 is a bottom view of the presser foot sole plate of the utility model;

FIG. 12 is a schematic view of the structure of the sewing machine of the present utility model;

FIG. 13 is a view showing the positional relationship between the presser foot base plate and the feed dog;

fig. 14 is a schematic structural view of the feeding teeth.

The reference numerals in the drawings illustrate:

10. A presser foot handle;

20. A presser foot bottom plate; 21. filling the groove; 22. a boss; 23. a filling layer; 24. upper grooving; 25. a vertical connecting hole;

30. A spring;

40. A front guide plate;

50. a rear guide plate;

60. A presser foot pin;

70. Feeding teeth; 71. and feeding teeth.

Detailed Description

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present utility model and are not intended to be limiting.

In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In an embodiment, as shown in fig. 1-14, a vertically extending filling groove 21 is provided on a working surface of a presser foot base plate 20, a filling layer 23 made of a material different from that of the presser foot base plate 20 is provided in the filling groove 21, and a bottom surface of the filling layer 23 and the working surface of the presser foot base plate 20 are coplanar, so that during sewing, a feeding tooth 70 can be simultaneously contacted with the bottom surface of the filling layer 23 and the working surface of the presser foot base plate 20 in a transverse direction and/or a longitudinal direction.

The application adopts a composite structure, the working surface of the presser foot base plate 20 is provided with the filling groove 21, the filling groove 21 is internally provided with the filling layer 23 which is made of different materials from the presser foot base plate 20, and the working surfaces of the filling layer 23 and the presser foot base plate 20 are coplanar, so that in the sewing process, the feeding teeth 70 can be simultaneously contacted with the bottom surface of the filling layer 23 and the working surface of the presser foot base plate 20 in the transverse direction and/or the longitudinal direction, and further the composite presser foot can have the service performance of a plastic presser foot and the service life of a metal presser foot.

In the present application, the lateral direction refers to the double arrow direction in fig. 1, and the longitudinal direction refers to the single arrow direction in fig. 1; the working surface of footpad 20 refers to the bottom surface of footpad 20 that is intended to mate with feed tooth 70, i.e., the surface of footpad 20 that contacts the fabric.

In embodiment 1, as shown in fig. 3, 4, 12 and 13, a vertically extending filling groove 21 is provided on a working surface (bottom surface) of a presser foot base plate 20, the filling groove 21 is provided with a boss 22 and a filling layer 23, the boss 22 and the presser foot base plate 20 are integrally formed, the boss 22 extends downward in the vertical direction, the filling layer 23 surrounds the periphery of the boss 22, the bottom surface of the filling layer 23 and the bottom surface of the boss 22 are coplanar with the working surface of the presser foot base plate 20, and the filling layer 23 and the boss 22 are alternately arranged in the longitudinal direction and the transverse direction, so that a feeding tooth 70 can be simultaneously contacted with the bottom surfaces of the boss 22 and the filling layer 23.

As shown in fig. 3, 7 and 13, the cross section of the boss 22 is diamond, the number of bosses 22 is plural, the plural bosses 22 are linearly arranged in the filling groove 21 in a plurality of rows, and the adjacent two rows of bosses 22 are arranged in a staggered manner, so that all bosses 22 are distributed in the filling groove 21 in a grid shape.

Specifically, as shown in fig. 13, the length and width of the boss 22 are d×f; the apex angle angles of the boss 22 are α and β; the grid spacing of two adjacent bosses 22 is e and g; the boss 22 is positioned at an angle γ.

Preferably, the distance between two adjacent bosses 22 in the lateral direction and the vertical direction is equal to or less than zero, so that each tooth of the feeding tooth 70 can be simultaneously contacted with the boss 22 and the filling layer 23, that is, the contact surfaces a, c, a' of the feeding tooth 70 are simultaneously contacted with the boss 22 and the filling layer 23 during the sewing process.

In other embodiments, as shown in fig. 8 and 9, the cross-section of the boss 22 may be rectangular or circular or other regular polygonal shape.

More preferably, the bottom surface area ratio of the filling layer 23 to the boss 22 is 3:2 to 4:1, that is, the bottom surface area of the filling layer 23 is 60% to 80% of the working surface area of the presser foot base plate 20, which is 75% in this embodiment. Still preferably, as shown in fig. 6, a front guide plate 40 is integrally formed at one lateral end of the presser foot base plate 20, a rear guide plate 50 is integrally formed at the other lateral end of the presser foot base plate 20, and both ends of the filling groove 21 extend laterally to the front guide plate 40 and the rear guide plate 50.

In embodiment 2, as shown in fig. 10, a presser foot board is provided, on a working surface (bottom surface) of a presser foot board 20, with a filling groove 21 extending vertically, the filling groove 21 being provided with a boss 22 and a filling layer 23; the boss 22 is integrally formed with the presser foot base plate 20, and the boss 22 extends downward in the vertical direction; the number of the bosses 22 is a plurality, and a plurality of strip-shaped bosses 22 are longitudinally arranged at intervals, and the two transverse ends of the bosses 22 are fixedly connected with the presser foot bottom plate 20; the filling layer 23 is disposed at one or both sides of the longitudinal direction of the boss 22, and the filling layer 23 and the boss 22 are alternately disposed in the longitudinal direction, and the bottom surface of the filling layer 23 and the bottom surface of the boss 22 are coplanar with the working surface of the presser foot base 20 so that the feeding teeth 70 can be simultaneously contacted with the boss 22 and the filling layer 23 in the longitudinal direction.

In other embodiments, as shown in fig. 11, a plurality of elongated bosses 22 are arranged at a lateral interval, the filling layer 23 is arranged on one or both lateral sides of the bosses 22, and the filling layer 23 and the bosses 22 are alternately arranged in the lateral direction.

Embodiment 3 as shown in fig. 3 and 4, a presser foot board is provided, on a working surface of a presser foot board 20, with a filling groove 21 extending vertically, the filling groove 21 being provided with a boss 22 and a filling layer 23; the boss 22 is integrally formed with the presser foot base plate 20, and the plurality of bosses 22 extend downward in the vertical direction; the filling layer 23 is made of polytetrafluoroethylene, the filling layer 23 is arranged around the boss, and the filling layer 23 is injection molded in the filling groove 21.

Preferably, as shown in fig. 5, an upper groove 24 is provided on the upper surface (top surface) of the presser foot base plate 20, the upper groove 24 is provided in a lateral direction or a longitudinal direction, and the upper groove 24 communicates with the filling groove 21 through a vertical connection hole 25 so that a longitudinal section of the filling layer 23 injection-molded in the filling groove 21 is i-shaped; this allows for a more secure and stable installation of the filling layer 23 in the filling slot 21.

In other embodiments, the material of the filling layer 23 may be a low friction, self-lubricating material such as molybdenum-based ceramic, copper, and graphite.

In other embodiments, the filling layer 23 may be adhesively fixed in the filling slot 21, and the filling layer 23 may also be press-fitted in the filling slot 21.

Embodiment 4 as shown in fig. 1 and 2, a composite presser foot comprises a presser foot handle 10 and a presser foot sole plate 20; the presser foot handle 10 is arranged along the vertical direction, the presser foot bottom plate 20 is made of iron, the presser foot bottom plate 20 is arranged below the presser foot handle 10 along the transverse direction, and the middle part of the upper surface of the presser foot bottom plate 20 is fixedly connected with the bottom end of the presser foot handle 10.

Embodiment 5 as shown in fig. 1 and 2, a composite presser foot comprises a presser foot handle 10, a presser foot bottom plate 20 and a spring 30; the presser foot handle 10 is arranged along the vertical direction; the presser foot base plate 20 is made of steel, the presser foot base plate 20 is arranged right below the presser foot handle 10 along the transverse direction, and the bottom end of the presser foot handle 10 is rotationally connected with the presser foot base plate 20 through a presser foot pin 60; the spring 30 is disposed on one lateral side of the presser foot pin 60, and the spring 30 is installed between the presser foot shank 10 and the presser foot sole plate 20 in the vertical direction.

Embodiment 6 as shown in fig. 12, 13 and 14, a sewing machine comprises a composite presser foot and a feed dog 70, wherein the feed dog 70 is disposed directly under a presser foot base 20 of the composite presser foot, and a working area of the feed dog 70 can be simultaneously contacted with a bottom surface of a filling layer 23 and a working surface of the presser foot base 20 in a longitudinal direction and/or a lateral direction.

As shown in fig. 14, a plurality of rows of feeding teeth 71 are provided at a lateral interval in the working area of the feeding teeth 70, and each row of feeding teeth 71 can be simultaneously contacted with the filling layer 23 and the boss 22 in the longitudinal direction.

As for the elongated boss 22, as shown in fig. 10, although each row of the feeding teeth 71 is in contact with only the filler layer 23 or the boss 22 alone in the lateral direction, each row of the feeding teeth 71 is in alternating contact with the bottom surface of the filler layer 23 and the bottom surface of the boss 22 in the longitudinal direction.

As shown in fig. 11, although each row of the feeding teeth 71 is in contact with only the filling layer 23 or the boss 22 alone in the longitudinal direction, the feeding teeth 71 of the feeding teeth 70 can be in contact with the bottom surface of the filling layer 23 and the bottom surface of the boss 22 at the same time in the transverse direction for the entire feeding teeth 70.

In other embodiments, a plurality of rows of feed teeth 71 are longitudinally spaced apart in the working area of feed teeth 70, with feed teeth 71 being capable of contacting the bottom surface of packed bed 23 and the working surface of presser foot sole plate 20 in the lateral direction.

As shown in fig. 13, three contact surfaces of the feeding tooth 70 and the presser foot base 20 are three, namely, a contact surface a, a contact surface c and a contact surface a', and the three contact surfaces extend in the lateral direction, so that the feeding tooth 71 of the feeding tooth 70 alternately contacts the filling layer 23 and the boss 22 in the length direction of the contact surface on each contact surface.

As shown in fig. 7, for the bosses 22 having a diamond shape and a circular shape in cross section, the bosses 22 are distributed in the filling grooves 21 in a grid shape; a plurality of feeding teeth 71 are provided in the working area of feeding teeth 70, the plurality of feeding teeth 71 are distributed at the top end of feeding teeth 70 in an array, and each feeding tooth 71 can be simultaneously contacted with the bottom surface of filling layer 23 and the working surface of presser foot sole plate 20 along the longitudinal direction or the transverse direction, so that feeding teeth 70 can be simultaneously contacted with the bottom surface of filling layer 23 and the working surface of presser foot sole plate 20 along the longitudinal direction and/or the transverse direction.

The working principle of the composite presser foot of the utility model is as follows:

As shown in fig. 3, fig. 4, fig. 12 and fig. 13, the boss 22 and the filling layer 23 located in the filling groove 21 are alternately arranged along the transverse direction and/or the longitudinal direction, and the bottom surfaces of the boss 22 and the filling layer 23 are coplanar with the working surface of the presser foot bottom plate 20, in the sewing process, the feeding teeth 70 distributed at intervals transversely are always contacted with the boss 22 and the filling layer 23 in the transverse direction or the longitudinal direction, the material of the filling layer 23 is polytetrafluoroethylene, so that the composite presser foot has the performance of a plastic presser foot, the material of the boss 22 is iron, the composite presser foot has the service life of a metal presser foot, and further the composite presser foot has better service performance and longer service life.

Compared with the prior art, the application has at least the following beneficial technical effects:

According to the application, a composite structure is adopted, and different materials are distributed on the bottom surface of the presser foot base plate according to a proportion, so that the feeding teeth can be contacted with various materials at the same time, and the composite presser foot is ensured to have longer service life and better performance.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims (15)

1. The presser foot base plate is characterized in that a filling groove (21) is formed in the working surface of the presser foot base plate (20), a filling layer (23) made of materials different from those of the presser foot base plate (20) is arranged in the filling groove (21), and the bottom surface of the filling layer (23) is coplanar with the working surface of the presser foot base plate (20).

2. A presser foot sole plate according to claim 1, characterized in that the filling slot (21) is internally formed with vertically extending bosses (22), the bottom surfaces of the bosses (22) and the working surface of the presser foot sole plate (20) are coplanar, and the filling layers (23) and the bosses (22) are alternately arranged in the longitudinal direction and/or in the transverse direction.

3. A footpad according to claim 2, wherein the cross-section of the boss (22) is diamond, rectangular or circular.

4. A footplate according to claim 3, characterized in that the bosses (22) are arranged in a linear array in a plurality of rows in the filling slot (21), and adjacent two rows of the bosses (22) are arranged in a staggered arrangement.

5. A footpad according to claim 2, wherein a plurality of elongated bosses (22) are provided at a lateral or longitudinal spacing, and wherein the bosses (22) are integrally formed with the footpad (20).

6. A footplate according to claim 2, wherein the area ratio of the bottom surfaces of the filling layer (23) and the boss (22) is from 3:2 to 4:1.

7. A presser foot sole plate according to claim 1, characterized in that the material of the filling layer (23) is one of polytetrafluoroethylene, molybdenum-based ceramic, copper and graphite; the presser foot bottom plate (20) is made of iron or steel.

8. A footpad according to claim 1, wherein the filling layer (23) is adhesively secured in the filling slot (21) or wherein the filling layer (23) is press-fitted in the filling slot (21).

9. A footpad according to claim 1, wherein the filling layer (23) is injection molded in the filling groove (21).

10. The presser foot sole plate according to claim 9, characterized in that the upper surface of the presser foot sole plate (20) is provided with an upper slot (24), the upper slot (24) being in communication with the filling slot (21) through a vertical connecting hole (25) so that the longitudinal section of the filling layer (23) is i-shaped.

11. A footplate according to claim 1, characterized in that the footplate (20) is provided with a front guide plate (40) and a rear guide plate (50) at its lateral ends, respectively, and the two ends of the filling slot (21) extend laterally to the front guide plate (40) and the rear guide plate (50).

12. A composite presser foot comprising a presser foot sole plate as claimed in any one of claims 1 to 11, characterised in that the composite presser foot further comprises a presser foot handle (10), the bottom end of the presser foot handle (10) being connected to the presser foot sole plate (20).

13. A sewing machine comprising a composite presser foot as claimed in claim 12, characterized in that it further comprises a feed dog (70), said feed dog (70) being arranged directly under the presser foot sole plate (20) of the composite presser foot, and the working area of said feed dog (70) being capable of being simultaneously in contact with the bottom surface of the filling layer (23) and the working surface of the presser foot sole plate (20) in the longitudinal and/or transverse direction.

14. A sewing machine according to claim 13, characterized in that the work area of the feed teeth (70) is provided with a plurality of rows of feed teeth (71) at a lateral distance, and each row of feed teeth (71) is capable of simultaneously contacting the bottom surface of the filling layer (23) and the work surface of the presser foot sole (20) in the longitudinal direction; or alternatively

A plurality of rows of feeding teeth (71) are longitudinally arranged in the working area of the feeding teeth (70) at intervals, and each row of feeding teeth (71) can be simultaneously contacted with the bottom surface of the filling layer (23) and the working surface of the presser foot bottom plate (20) along the transverse direction.

15. A sewing machine according to claim 13, characterized in that the working area of the feed tooth (70) is provided with a plurality of feed teeth (71), each feed tooth (71) being capable of simultaneously contacting the bottom surface of the filling layer (23) and the working surface of the presser foot sole plate (20) in the longitudinal or transverse direction.