Composite presser foot bottom plate, composite presser foot and sewing machine

Abstract

The composite presser foot bottom plate comprises a presser foot plate body and an injection molding filling layer, a filling groove with a downward opening is formed in the working face of the presser foot plate body, and the injection molding filling layer made of different materials from the presser foot plate body is formed in the filling groove. The lower surface of the injection molding filling layer and the working face of the presser foot plate body are coplanar, an injection molding hole communicated with the filling groove is formed in the presser foot plate body, and an injection molding filling column integrally connected with the injection molding filling layer is formed in the injection molding hole. The composite presser foot not only has the usability of a plastic presser foot and the service life of a metal presser foot, but also can improve the firmness of the injection molding filling layer in the filling groove of the presser foot plate body, and improves the workability of the composite presser foot bottom plate.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a composite presser foot sole plate, a composite presser foot and a sewing machine. Background Art

[0002] In the prior art, there are two main types of presser feet for sewing machines, one is a plastic presser foot and the other is a metal presser foot. When the metal presser foot is used to sew leather fabrics, the friction between the fabric and the metal presser foot is relatively large, making it difficult to move the metal presser foot, which makes the performance of the metal presser foot lower than that of the plastic presser foot. However, the wear resistance of plastic is relatively poor, and 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 of the plastic presser foot than that of the metal presser foot.

[0003] Therefore, how to balance the performance and service life of the presser foot has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a composite presser foot bottom plate to solve the technical problem that the performance and service life of the existing presser foot cannot be taken into account at the same time.

[0005] The technical scheme adopted by the utility model is: a composite presser foot sole plate, the composite presser foot sole plate comprises a presser foot body and an injection-molded filling layer, a filling groove with a downward opening is formed on the working surface of the presser foot body, an injection-molded filling layer whose material is different from that of the presser foot body is formed in the filling groove, the lower surface of the injection-molded filling layer is coplanar with the working surface of the presser foot body, an injection-molded hole connected with the filling groove is formed on the presser foot body, and an injection-molded filling column integrally connected with the injection-molded filling layer is formed in the injection-molded hole.

[0006] Preferably, the injection hole is thicker at the top and thinner at the bottom.

[0007] Preferably, the injection hole is a tapered hole.

[0008] Preferably, the taper angle of the injection hole is 5° to 15°.

[0009] Preferably, a plurality of vertical bosses are formed in the filling groove, the upper end surfaces of the vertical bosses are fixedly connected to the presser foot body, and the lower end surfaces of the vertical bosses are coplanar with the working surface of the presser foot body.

[0010] Preferably, the vertical boss is thin at the top and thick at the bottom.

[0011] Preferably, the vertical boss is a conical column or a polygonal pyramid.

[0012] Preferably, the angle between the side surface of the vertical boss and the vertical plane is 1° to 5°.

[0013] Preferably, the radial dimension of the vertical boss is 1 / 3 to 1 / 2 of the distance between two adjacent vertical bosses, and the thickness of the injection-molded filling layer is 1 / 4 to 2 / 3 of the thickness of the presser foot body.

[0014] Preferably, the injection-molded filling layers and the vertical bosses are alternately arranged along the longitudinal direction and / or the transverse direction.

[0015] Preferably, a guide portion is formed at a transverse end portion of the presser foot body, the filling groove extends transversely to the guide portion, and a lower surface of a portion of the injection-molded filling layer is coplanar with a guide surface of the guide portion.

[0016] Preferably, the injection molding filling layer is made of Teflon, copper or graphite.

[0017] The second purpose of the utility model is to provide a composite presser foot, comprising the above-mentioned composite presser foot base plate, presser foot handle and spring, the presser foot handle being arranged in the vertical direction, the composite presser foot base plate being arranged directly below the presser foot handle in the transverse direction, the bottom end of the presser foot handle being rotatably connected to the composite presser foot base plate through a presser foot pin, the spring being arranged on one lateral side of the presser foot pin, and the spring being installed between the presser foot handle and the composite presser foot base plate in the vertical direction.

[0018] The third purpose of the present utility model is to provide a sewing machine, which includes the above-mentioned composite presser foot.

[0019] Beneficial effects of the utility model:

[0020] The utility model is provided with a filling groove formed on the working surface of a presser foot body, and an injection molding hole connected with the filling groove is formed on the presser foot body, an injection molding filling layer whose material is different from that of the presser foot body is formed in the filling groove, and the lower surface of the injection molding filling layer is coplanar with the working surface of the presser foot body. During the sewing process, the presser foot body and the injection molding filling layer can contact with the cloth at the same time, so that the composite presser foot can have the performance of a plastic presser foot and the service life of a metal presser foot at the same time; at the same time, the injection molding hole not only facilitates the injection molding of the injection molding filling layer in the filling groove, but also increases the contact area between the presser foot body and the injection molding filling layer, thereby improving the stability of the connection between the injection molding filling layer and the presser foot body.

[0021] The utility model arranges the injection holes on the presser plate body into a coarse-upper-lower-thin structure, so that after the injection-molded filling layer is injection-molded in the filling groove, the presser plate body can limit the injection-molded filling column in the vertical direction, thereby improving the firmness of the injection-molded filling layer in the filling groove.

[0022] The utility model arranges the radial bosses in the filling groove into a thin upper and thick lower structure, so that after the injection molding filling layer is injection molded in the filling groove, two adjacent radial bosses can limit the injection molding filling layer in the vertical direction, further improving the firmness of the injection molding filling layer in the filling groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a three-dimensional schematic diagram of the composite presser foot sole from a first perspective of the utility model;

[0024] Figure 2 It is a stereoscopic schematic diagram of the composite presser foot sole from a second viewing angle of the utility model;

[0025] Figure 3 It is a top view of the composite presser foot sole of the utility model;

[0026] Figure 4 It is a bottom view of the composite presser foot sole of the utility model;

[0027] Figure 5 It is a structural schematic diagram of the composite presser foot bottom plate of the utility model;

[0028] Figure 6 is a three-dimensional schematic diagram of a presser foot body;

[0029] Figure 7 It is a schematic diagram of the structure of the presser foot body from the first perspective;

[0030] Figure 8 It is a schematic structural diagram of the presser foot body from a second viewing angle;

[0031] Fig. 9 for Figure 8 Middle partial enlarged picture;

[0032] Fig.10 It is a three-dimensional schematic diagram of an injection-molded filling layer and an injection-molded filling column;

[0033] Fig.11 It is a structural schematic diagram of the composite presser foot.

[0034] Description of reference numerals in the figures:

[0035] 10. Composite presser foot plate;

[0036] 11. Presser foot body; 12. Injection molding filling layer; 13. Filling groove; 14. Injection molding hole; 15. Injection molding filling column; 16. Vertical boss; 17. Guide part;

[0037] 20. Presser foot handle;

[0038] 30. Spring;

[0039] 40. Presser foot pin. DETAILED DESCRIPTION

[0040] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0044] Examples, such as Figure 1-Figure 10 As shown, a composite presser foot sole plate, the composite presser foot sole plate 10 includes a presser foot body 11 and an injection molded filling layer 12, a filling groove 13 with a downward opening is formed on the working surface of the presser foot body 11, an injection molded filling layer 12 whose material is different from that of the presser foot body 11 is formed in the filling groove 13, and the lower surface of the injection molded filling layer 12 is coplanar with the working surface of the presser foot body 11; an injection molded hole 14 connected to the filling groove 13 is formed on the presser foot body 11, and an injection molded filling column 15 integrally connected to the injection molded filling layer 12 is formed in the injection molded hole 14.

[0045] The present application forms a filling groove 13 on the working surface of the presser foot body 11, and forms an injection hole 14 connected with the filling groove 13 on the presser foot body 11, and forms an injection molding filling layer 12 whose material is different from that of the presser foot body 11 in the filling groove 13, and the lower surface of the injection molding filling layer 12 is coplanar with the working surface of the presser foot body 11. During the sewing process, the presser foot body 11 and the injection molding filling layer 12 can contact the cloth at the same time, so that the composite presser foot can have the performance of a plastic presser foot and the service life of a metal presser foot at the same time; at the same time, the injection molding hole 14 not only facilitates the injection molding of the injection molding filling layer 12 in the filling groove 13, but also can increase the contact area between the presser foot body 11 and the injection molding filling layer 12, thereby improving the stability of the connection between the injection molding filling layer 12 and the presser foot body 11.

[0046] It should be noted that: in this application, the horizontal direction and the left-right direction refer to Figure 1 The X-axis direction in the longitudinal direction and the front-back direction refer to Figure 1 The Y-axis direction in the vertical direction and the up-down direction refer to Figure 1 The Z-axis direction.

[0047] Specific embodiment 1, as Figure 1-Figure 10 As shown, a composite presser foot sole plate, the composite presser foot sole plate 10 includes a presser foot body 11 and an injection-molded filling layer 12, a filling groove 13 with an opening downward is formed on the working surface at the bottom of the presser foot body 11, an injection-molded filling layer 12 whose material is different from that of the presser foot body 11 is formed in the filling groove 13, and the lower surface of the injection-molded filling layer 12 is coplanar with the working surface of the presser foot body 11; a plurality of injection holes 14 connected to the filling groove 13 are formed on the presser foot body 11, the injection holes 14 are thick at the top and thin at the bottom, and injection-molded filling columns 15 integrally connected to the injection-molded filling layer 12 are formed in the injection holes 14.

[0048] This arrangement is because: in the present embodiment, the bottom end of the injection molding filling column 15 is fixedly connected to the injection molding filling layer 12, and the injection molding hole 14 is arranged to be thick at the top and thin at the bottom, so that the injection molding hole 14 can limit the injection molding filling column 15 in the vertical direction, thereby improving the firmness of the connection between the injection molding filling layer 12 and the pressure foot body 11.

[0049] Preferably, the injection hole 14 is a tapered hole, that is, the cross section of the injection hole 14 is circular, and the radial dimension of the top of the injection hole 14 is greater than the radial dimension of the bottom of the injection hole 14 .

[0050] More preferably, the taper angle of the injection hole 14 is α, and is 5°≤α≤15°.

[0051] Specific embodiment 2, as Figure 1-Figure 10As shown, a composite presser foot sole plate 10 includes a presser foot body 11 and an injection-molded filling layer 12. A filling groove 13 with a downward opening is formed on the working surface of the presser foot body 11, and an injection-molded filling layer 12 whose material is different from that of the presser foot body 11 is formed in the filling groove 13, and the lower surface of the injection-molded filling layer 12 is coplanar with the working surface of the presser foot body 11; a plurality of injection holes 14 connected to the filling groove 13 are formed on the presser foot body 11, and injection-molded filling columns 15 integrally connected to the injection-molded filling layer 12 are formed in the injection holes 14.

[0052] A plurality of vertical bosses 16 are formed in the filling groove 13 , and the plurality of vertical bosses 16 are evenly distributed in the filling groove 13 . The upper end faces of the vertical bosses 16 are integrally formed and fixedly connected with the presser foot body 11 , and the lower end faces of the vertical bosses 16 are coplanar with the working surface of the presser foot body 11 .

[0053] The reason for such arrangement is that: a plurality of vertical bosses 16 are formed in the filling groove 13, and when the injection molded filling layer 12 is formed in the filling groove 13 by the injection molding process, the vertical boss 16 vertically penetrates the injection molded filling layer 12, that is, the injection molded filling layer 12 is wrapped in the front, back, left and right of the vertical boss 16, so that during the sewing process, the vertical boss 16 and the injection molded filling layer 12 can contact the fabric at the same time, thereby improving the service life of the composite presser foot bottom plate 10; at the same time, the vertical boss 16 can increase the contact area between the injection molded filling layer 12 and the presser foot body 11, and further improve the firmness of the injection molded filling layer 12 in the filling groove 13.

[0054] Specifically, the cross-section of the vertical boss 16 is circular, and the distance between two adjacent vertical bosses 16 is d, and the radial dimension of the vertical boss 16 is (1 / 3~1 / 2)*d; the thickness dimension of the presser foot body 11 is b, that is, the vertical dimension of the presser foot body 11 is b, and the thickness dimension of the injection molding filling layer 12 is c, c=(1 / 4~2 / 3)*b.

[0055] Preferably, the vertical boss 16 is a structure that is thin at the top and thick at the bottom.

[0056] This arrangement is because: when the vertical boss 16 adopts a thin-at-top and thick-at-bottom structure, after the injection-molded filling layer 12 is injection-molded in the filling groove 13, the injection-molded filling layer 12 between adjacent vertical bosses 16 can be wedge-shaped as a whole, and the wedge-shaped injection-molded filling layer 12 can improve the firmness of the injection-molded filling layer 12 in the filling groove 13.

[0057] More preferably, the vertical boss 16 is a conical column, and the radial dimension of the top end of the conical column is smaller than the radial dimension of the bottom end of the conical column.

[0058] In other embodiments, Figure 6 and Fig. 9As shown, the vertical boss 16 is a polygonal pyramid, and the side length of the top of the polygonal pyramid is smaller than the side length of the bottom of the polygonal pyramid, so that each side surface of the polygonal pyramid forms an angle β / 2 with the vertical plane, and 1°≤β≤10°.

[0059] More preferably, the injection molded filling layer 12 and the vertical boss 16 are alternately arranged along the longitudinal direction, or the injection molded filling layer 12 and the vertical boss 16 are alternately arranged along the transverse direction, so that in the transverse direction or the longitudinal direction, the injection molded filling layer 12 and the vertical boss 16 can alternately contact the cloth, so that the composite presser foot can have both the performance of a plastic presser foot and the service life of a metal presser foot.

[0060] Specific embodiment 3, as Figure 1 , Figure 5 and Figure 6 As shown, a composite presser foot sole plate 10 includes a presser foot body 11 and an injection-molded filling layer 12. A filling groove 13 with a downward opening is formed on the working surface of the presser foot body 11, and an injection-molded filling layer 12 whose material is different from that of the presser foot body 11 is formed in the filling groove 13, and the lower surface of the injection-molded filling layer 12 is coplanar with the working surface of the presser foot body 11; a plurality of injection holes 14 connected to the filling groove 13 are formed on the presser foot body 11, and injection-molded filling columns 15 integrally connected to the injection-molded filling layer 12 are formed in the injection holes 14.

[0061] A guide portion 17 is formed at the lateral end of the presser foot body 11, and the filling groove 13 extends laterally to the guide portion 17, that is, the guide portion 17 is integrally formed at the front or back end or the rear end of the presser foot body 11. In the lateral direction, the filling groove 13 covers the entire presser foot body 11 and part of the guide portion 17, and the lower surface of the part of the injection-molded filling layer 12 located on the guide portion 17 is coplanar with the guide surface of the guide portion 17.

[0062] More preferably, the material of the presser plate body 11 and the vertical boss 16 is iron, and the material of the injection molding filling layer 12 is Teflon, copper or graphite.

[0063] Examples, such as Fig.11 As shown, a composite presser foot comprises the composite presser foot base plate 10, a presser foot handle 20 and a spring 30. The presser foot handle 20 is arranged in the vertical direction, and the composite presser foot base plate 10 is arranged directly below the presser foot handle 20 in the transverse direction. The bottom end of the presser foot handle 20 is rotatably connected to the composite presser foot base plate 10 through a presser foot pin 40. The spring 30 is arranged on one lateral side of the presser foot pin 40, and the spring 30 is installed between the presser foot handle 20 and the composite presser foot base plate 10 in the vertical direction.

[0064] Embodiment, a sewing machine, the sewing machine comprises the above-mentioned composite presser foot.

[0065] Compared with the prior art, this application has at least the following beneficial technical effects:

[0066] The present application can not only improve the firmness of the injection-molded filling layer in the filling groove of the presser foot body and improve the processability of the composite presser foot bottom plate, but also utilize the limiting effect of the structure of the presser foot body itself on the injection-molded filling layer, making the injection molding of the injection-molded filling layer in the filling groove more firm.

[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A composite presser foot sole, characterized in that: The composite presser foot sole plate (10) comprises a presser foot body (11) and an injection-molded filling layer (12); a filling groove (13) opening downward is formed on the working surface of the presser foot body (11); an injection-molded filling layer (12) made of a material different from that of the presser foot body (11) is formed in the filling groove (13); the lower surface of the injection-molded filling layer (12) is coplanar with the working surface of the presser foot body (11); an injection-molded hole (14) communicating with the filling groove (13) is formed on the presser foot body (11); and an injection-molded filling column (15) integrally connected to the injection-molded filling layer (12) is formed in the injection hole (14).

2. A composite presser foot sole according to claim 1, characterized in that: The injection hole (14) is thick at the top and thin at the bottom.

3. A composite presser foot sole according to claim 2, characterized in that: The injection hole (14) is a tapered hole.

4. A composite presser foot sole according to claim 3, characterized in that: The taper angle of the injection hole (14) is 5° to 15°.

5. The composite presser foot sole according to claim 1, characterized in that: A plurality of vertical bosses (16) are formed in the filling groove (13); the upper end surfaces of the vertical bosses (16) are fixedly connected to the presser foot body (11); and the lower end surfaces of the vertical bosses (16) are coplanar with the working surface of the presser foot body (11).

6. The composite presser foot sole according to claim 5, characterized in that: The vertical boss (16) is thin at the top and thick at the bottom.

7. The composite presser foot sole according to claim 6, characterized in that: The vertical boss (16) is a conical column or a polygonal pyramid.

8. The composite presser foot sole according to claim 7, characterized in that: The included angle between the side surface of the vertical boss (16) and the vertical plane is 1° to 5°.

9. The composite presser foot sole according to claim 5, characterized in that: The radial dimension of the vertical boss (16) is 1 / 3 to 1 / 2 of the distance between two adjacent vertical bosses (16), and the thickness of the injection-molded filling layer (12) is 1 / 4 to 2 / 3 of the thickness of the presser foot body (11).

10. The composite presser foot sole according to claim 5, characterized in that: The injection-molded filling layers (12) and the vertical bosses (16) are alternately arranged along the longitudinal direction and / or the transverse direction.

11. The composite presser foot sole according to claim 1, characterized in that: A guide portion (17) is formed at the transverse end of the presser foot body (11), the filling groove (13) extends transversely to the guide portion (17), and the lower surface of a portion of the injection-molded filling layer (12) is coplanar with the guide surface of the guide portion (17).

12. The composite presser foot sole according to claim 1, characterized in that: The injection molding filling layer (12) is made of Teflon, copper or graphite.

13. A composite presser foot, comprising the composite presser foot sole plate according to any one of claims 1 to 12, characterized in that: The composite presser foot further comprises a presser foot handle (20) and a spring (30); the presser foot handle (20) is arranged in the vertical direction; the composite presser foot base plate (10) is arranged directly below the presser foot handle (20) in the transverse direction; the bottom end of the presser foot handle (20) is rotatably connected to the composite presser foot base plate (10) via a presser foot pin (40); the spring (30) is arranged on one transverse side of the presser foot pin (40); and the spring (30) is installed between the presser foot handle (20) and the composite presser foot base plate (10) in the vertical direction.

14. A sewing machine, characterized in that: The sewing machine comprises the composite presser foot according to claim 13.

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