Presser foot and sewing machine

Abstract

The presser foot comprises a mounting seat and a presser foot body, the presser foot body is rotatably mounted at the lower end of the mounting seat, a threaded hole and a columnar through hole are formed in the mounting seat, the threaded hole is inclined to the lifting direction of the presser foot, a first hole opening of the columnar through hole is formed in the bottom of the mounting seat, and a second hole opening of the columnar through hole is formed in the bottom of the mounting seat. A second orifice of the columnar through hole is communicated with the threaded hole, and the columnar through hole is inclined to the threaded hole; the presser foot further comprises an elastic part, an extrusion part and a stud, the elastic part and the extrusion part are arranged in the columnar through hole, the elastic part is connected between the presser foot body and the extrusion part in an abutting mode, one part of the extrusion part can stretch into the threaded hole, at least one part of the stud is installed in the threaded hole and connected with the extrusion part in an abutting mode, and the stud can force the extrusion part to move towards the presser foot body. The sewing machine is provided with the presser foot, the material pressing force of the presser foot to the presser foot body is easy to adjust, operation is easy, time and labor are saved, adjusting flexibility is high, and working efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, and specifically, to a presser foot and a sewing machine having the presser foot. Background Art

[0002] The presser foot of a sewing machine is one of the important components of the sewing machine. It is used to tightly press the fabric during sewing to prevent the fabric from moving, ensuring the neatness and stability of the sewing thread trace; and the presser foot is also used in cooperation with the feed dog to push the fabric to move, controlling the sewing speed and direction; in addition, the appearance of the thread trace can be made more beautiful by adjusting the pressure of the presser foot (which can affect the tension of the sewing thread).

[0003] An existing presser foot is as Figure 1 shown. It includes a mounting base, a presser foot body and an elastic member (such as a compression spring). A blind hole is provided on the mounting base. The blind hole is parallel to the lifting direction of the presser foot, and the opening of the blind hole is arranged towards the bottom of the presser foot; the presser foot body is rotatably connected to the lower end of the mounting base, so that the presser foot body can swing relative to the mounting base to a certain extent; the elastic member is installed in the blind hole, and the elastic member abuts between the bottom of the blind hole and the bottom plate of the presser foot body. The elastic member is used to ensure the pressing force of the presser foot on the material, so that the sewing material can be pulled to move when the feed dog rises. However, the disadvantage of this kind of presser foot is that: since the elastic member is installed in the blind hole and the elastic potential energy is not adjustable (except when the elastic member is compressed by the presser foot body, that is, the elastic potential energy of the elastic member cannot be actively adjusted), when it is necessary to change the pressing force of the presser foot body, the elastic member has to be replaced with another elastic member (such as a spring with a longer length or a spring with a shorter length). During the replacement process of the elastic member, the presser foot body has to be removed from the mounting base first, then the elastic member is replaced, and then the presser foot body is reinstalled on the mounting base again; therefore, the operation of adjusting the pressing force of the entire presser foot body is cumbersome and troublesome, time-consuming and laborious, which is not conducive to improving work efficiency, and the adjustment flexibility is poor. Summary of the Invention

[0004] In order to solve the above problems, the main object of the utility model is to provide a presser foot with simple adjustment of the pressing force of the presser foot body, easy to operate, time-saving and labor-saving, strong adjustment flexibility and capable of improving work efficiency.

[0005] Another object of the utility model is to provide a sewing machine provided with the above presser foot.

[0006] In order to achieve the main object of the present utility model, the present utility model provides a presser foot, which includes a mounting base and a presser foot body. The presser foot body is rotatably mounted at the lower end of the mounting base. Among them, the mounting base is provided with a threaded hole and a columnar through hole. The threaded hole is inclined to the lifting direction of the presser foot. The first orifice of the columnar through hole is formed at the bottom of the mounting base, and the second orifice of the columnar through hole communicates with the threaded hole. The columnar through hole is inclined to the threaded hole; the presser foot further includes an elastic member, a pressing member and a stud. The elastic member and the pressing member are arranged in the columnar through hole. The elastic member abuts between the presser foot body and the pressing member. A part of the pressing member can extend into the threaded hole. At least a part of the stud is installed in the threaded hole and abuts against the pressing member. The stud can force the pressing member to move towards the presser foot body.

[0007] As can be seen from the above, by rotating and adjusting the stud, the stud can be pushed to move into the columnar through hole to compress the elastic member and increase the elastic potential energy, and then increase the pressure exerted by the elastic member on the presser foot body, so as to increase the pressing force of the presser foot body; and if the stud is rotated and adjusted to reduce the pushing amplitude of the stud on the pressing member or relieve the oppression of the pressing member, the elastic member can release the elastic potential energy to make the pressing member move into the threaded hole, so as to reduce the pressure exerted by the elastic member on the presser foot body, thereby reducing the pressing force of the presser foot body; through the design of this presser foot, when adjusting the pressing force of the presser foot body, there is no need to disassemble and assemble the mounting base and the presser foot body, and replace the elastic member, making the adjustment of the pressing force of the presser foot body simpler, easier to operate, with strong adjustment flexibility, high adjustment efficiency, time-saving and labor-saving, which is beneficial to improving work efficiency.

[0008] A preferred solution is that a part of the stud is installed in the threaded hole and the other part extends outside the mounting base.

[0009] As can be seen from the above, setting a part of the stud outside the mounting base can not only reduce the volume of the mounting base, save the production cost of the mounting base, but also make the adjustment of the stud more convenient, and is beneficial to locking the stud after adjustment to prevent the stud from retracting after adjustment and causing a change in the pressing force of the presser foot body.

[0010] A further solution is that a card slot is provided at the end of the stud extending outside the mounting base. The card slot is recessed from the end face of the stud into the stud. The card slot is a flat slot, a cross slot or a polygonal slot, or an operation knob part is provided at the end of the stud extending outside the mounting base.

[0011] As can be seen from the above, setting a card slot at the end of the stud makes it possible to quickly adjust the stud through tools (such as a screwdriver, a hex wrench, etc.) when adjusting the pressing force of the presser foot body, and then makes the rotation adjustment of the stud easier to operate; and by setting an operation knob part at the end of the stud, it is not necessary to use tools to rotate and adjust the stud, and the stud can be rotated and adjusted only by manually operating the operation knob part, making the rotation adjustment of the stud more convenient.

[0012] Another further solution is that the presser foot further includes a stop nut, which is threadedly connected to the stud and contacts the mounting base.

[0013] As can be seen from the above, the stop nut can prevent the adjusted stud from retracting.

[0014] A further solution is that the mounting base is further provided with a groove, which is recessed from the surface of the mounting base into the mounting base in the axial direction of the threaded hole. The groove has a mating surface that contacts the stop nut; the presser foot further includes a stop member, which is sleeved on the stud, and the stop member abuts between the mating surface and the stop nut. The stop member is a spring washer, a disc spring or a corrugated spring.

[0015] As can be seen from the above, the groove on the mounting base can be used to accommodate the stop nut, and through the mating connection between the mating surface of the groove and the stop nut, it can better prevent the nut from loosening due to the vibration generated during the operation of the sewing machine, thereby ensuring the effect of the stop nut preventing the stud from retracting; and setting the stop member to connect between the mating surface and the stop nut can further prevent the nut from loosening due to vibration.

[0016] Another preferred solution is that the elastic member is a compression spring; the extrusion member is spherical, and the first diameter of the extrusion member is greater than the inner diameter of the compression spring.

[0017] As can be seen from the above, using a compression spring as the elastic member can better ensure the stability and reliability of the pressure exerted by the elastic member on the presser foot body, and at the same time is beneficial to reducing costs; and through the structural design of the extrusion member, the screw can smoothly push the extrusion member into the cylindrical through hole and compress the compression spring.

[0018] Another preferred solution is that on the bottom surface of the presser foot body, the projections at both ends of the threaded hole are distributed along the material transfer direction of the presser foot; or on the bottom surface of the presser foot body, the projections at both ends of the threaded hole are distributed along the rotation axis of the presser foot body.

[0019] As can be seen from the above, the position design of the threaded hole and the stud can be adjusted according to conditions such as the user's use sense and operation habit, so that the user can use the presser foot and adjust the stud in the most comfortable state.

[0020] A further solution is that the presser foot body is provided with two symmetrically arranged connecting ears. The connecting ears are provided with first pin holes, and a slot is formed between the two connecting ears; the lower end of the mounting base is provided with second pin holes that cooperate with the first pin holes, and the lower end of the mounting base is inserted into the slot; the presser foot further includes a pin shaft, which is inserted into the two first pin holes and the second pin holes.

[0021] As can be seen from the above, the above design makes the overall mechanism of the presser foot more reasonable, and the structures of the mounting base and the presser foot body can be simplified as much as possible, and it is ensured that the presser foot body can rotate smoothly and reliably relative to the mounting base.

[0022] A further solution is that the presser foot body has a bottom plate, a front guiding arc plate and a rear guiding arc plate. The connecting ear is formed on the bottom plate. In the material moving direction of the presser foot, the bottom plate is located between the front guiding arc plate and the rear guiding arc plate. A needle dropping slot hole is provided on the bottom plate, and the needle dropping slot hole penetrates the bottom plate in the lifting direction; the bottom of the mounting base has an inclined surface, which is inclined to the lifting direction. The first distance between the inclined surface and the bottom plate near the front guiding arc plate side is smaller than the second distance between the inclined surface and the bottom plate near the rear guiding arc plate side; the columnar through hole is parallel to the lifting direction, and the included angle between the threaded hole and the columnar through hole is an obtuse angle; the part of the stud extending outside the mounting base is located obliquely above the threaded hole.

[0023] As can be seen from the above, the front guiding arc plate and the rear guiding guard plate have the functions of guiding the movement of the sewing material and reducing the resistance suffered by the sewing material during movement, and preventing the sewing material from sliding or twisting during sewing; the setting of the inclined surface at the bottom of the mounting base is beneficial to the rotation of the presser foot body relative to the mounting base; setting the columnar through hole parallel to the lifting direction can ensure that the elastic member applies pressure to the presser foot body better, and making the included angle between the threaded hole and the columnar through hole an obtuse angle is beneficial to the stud better pushing and pressing the pressing member to move into the columnar through hole; in addition, making the extending part of the stud located obliquely above the threaded hole is beneficial to the user to better operate the stud to rotate.

[0024] To achieve another object of the present invention, the present invention provides a sewing machine, which includes the above-mentioned presser foot.

[0025] As can be seen from the above, through the above-mentioned presser foot of the sewing machine, when adjusting the pressing force of the presser foot body, only by rotating the adjusting stud is needed, without disassembling and assembling the mounting base and the presser foot body and replacing the elastic member. The adjustment of the pressing force of the presser foot body is simpler and easier to operate, and has strong adjustment flexibility, high adjustment efficiency, time-saving and labor-saving, which is beneficial to improving work efficiency. Description of the Drawings

[0026] Figure 1 is a structural diagram of the existing presser foot.

[0027] Figure 2 is a structural diagram of the presser foot according to the embodiment of the present invention when the stud is in the first adjustment position.

[0028] Figure 3 is a structural diagram of the presser foot according to the embodiment of the present invention when the stud is in the second adjustment position.

[0029] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. Specific embodiments

[0030] Presser foot embodiment

[0031] Referring to Figure 2 and Figure 3 the presser foot 100 includes a mounting base 1, a presser foot body 2, a pin shaft 3, an elastic member 4, an extrusion member 5, a stud 6 and a stop nut 7.

[0032] The mounting base 1 is used to connect with the presser bar 101 on the sewing machine head, and the presser foot body 2 is rotatably connected to the lower end of the mounting base 1 through the pin shaft 3. Preferably, the presser foot body 2 has a bottom plate 21, a front guiding arc plate 22 and a rear guiding arc plate 23. Among them, two symmetrically arranged connecting ears 211 are provided on the bottom plate 21, a first pin hole penetrating through itself is provided on the connecting ears 211, and the first pin holes between the two connecting ears 211 are coaxially arranged; in addition, a slot is formed between the two connecting ears 211. A second pin hole is provided at the lower end of the mounting base 1 for cooperation with the first pin hole; when the mounting base 1 and the presser foot body 2 are assembled, the lower end of the mounting base 1 is inserted into the slot, and the second pin hole and the two first pin holes are coaxially arranged, and then the pin shaft 3 is inserted into the two first pin holes and the second pin hole to complete the assembly of the mounting base 1 and the presser foot body 2, and the presser foot body 2 can rotate relative to the mounting base 1 around the axis of the pin shaft 3. Through the design of the above-mentioned cooperation structure of the mounting base 1 and the presser foot body 2, the overall mechanism of the presser foot 100 is more reasonable, and it is also beneficial to the assembly of the elastic member 4 and the extrusion member 5, as well as the cooperation between the mounting base 1, the presser foot body 2, the elastic member 4, the extrusion member 5 and the stud 6; in addition, the above design can also simplify the structures of the mounting base 1 and the presser foot body 2 as much as possible, and ensure that the presser foot body 2 can rotate smoothly and reliably relative to the mounting base 1. Preferably, the bottom of the mounting base 1 has an inclined surface 11, the inclined surface 11 is inclined in the lifting direction of the presser foot 100 (this direction is parallel to the axial direction of the presser bar 101), and the first distance between the inclined surface 11 near the front guiding arc plate 22 side and the bottom plate 21 is less than the second distance between the inclined surface 11 near the rear guiding arc plate 23 side and the bottom plate 21. The setting of the inclined surface 11 is beneficial to the presser foot body 2 to rotate better relative to the mounting base 1.

[0033] In the material transfer direction of the presser foot 100 [i.e., the pulling direction of the feed dog 102 of the sewing machine on the sewing material (such as fabric)], the base plate 21 is located between the front guide arc plate 22 and the rear guide arc plate 23; the front guide arc plate 22 and the rear guide arc plate 23 are configured to guide the movement of the sewing material, reduce the resistance suffered by the sewing material during movement, increase the sewing speed, prevent the sewing material from sliding or twisting during sewing, reduce fabric damage. In addition, the front guide arc plate 22 and the rear guide arc plate 23 also enable the presser foot 100 to better adapt to different fabrics and reduce the noise during sewing. Further, a needle dropping slot hole 24 is provided on the base plate 21, and the needle dropping slot hole 24 penetrates the base plate 21 in the lifting direction of the presser foot 100, and the needle dropping slot hole 24 is for the needle of the sewing machine to pass through the presser foot body 2 and insert below the feed dog 102.

[0034] The mounting seat 1 is provided with a threaded hole 12 and a cylindrical through hole 13. Among them, the threaded hole 12 is inclined to the lifting direction of the presser foot 100, the first orifice of the cylindrical through hole 13 is formed at the bottom of the lower end of the mounting seat 1, such that the first orifice of the cylindrical through hole 13 is disposed opposite to the base plate 21 of the presser foot body 2, and the second orifice of the cylindrical through hole 13 communicates with the threaded hole 12, and the cylindrical through hole 13 is inclined to the threaded hole 12.

[0035] The elastic member 4 and the extrusion member 5 are disposed in the cylindrical through hole 13. The elastic member 4 abuts between the base plate 21 of the presser foot body 2 and the extrusion member 5. Among them, a part of the extrusion member 5 can extend into the threaded hole 12 under the action of the elastic potential energy of the elastic member 4. At least a part of the stud 6 is installed in the threaded hole 12, and the stud 6 can move to abut against the extrusion member 5, and then push the extrusion member 5 to force the extrusion member 5 to move towards the presser foot body 2 (i.e., move the extrusion member 5 into the cylindrical through hole 13).

[0036] In addition, the cylindrical through hole 13 is preferably parallel to the lifting direction, so that the elastic member 4 can better apply pressure to the presser foot body 2; and the included angle between the threaded hole 12 and the cylindrical through hole 13 is preferably an obtuse angle, so that the stud 6 can better push and press the extrusion member 5 to move into the cylindrical through hole 13.

[0037] In this embodiment, the elastic member 4 is preferably a compression spring, the extrusion member 5 is preferably spherical, and the first diameter of the spherical extrusion member 5 is greater than the inner diameter of the compression spring; using a compression spring as the elastic member 4 can better ensure the stability and reliability of the pressure applied by the elastic member 4 to the presser foot body 2, and at the same time is beneficial to cost reduction. By designing the structure of the extrusion member 5, the screw can smoothly push the extrusion member 5 into the cylindrical through hole 13 and compress the compression spring. Of course, as other alternative solutions, in other embodiments, the elastic member 4 can also be an elastic rubber column or other elastic members 4 having the same function as the compression spring.

[0038] In order to reduce the volume of the mounting base 1, save the production cost of the mounting base 1, and make the adjustment of the stud 6 more convenient, after the stud 6 is assembled with the threaded hole 12 on the mounting base 1, a part of the stud 6 is located inside the threaded hole 12, and the other part extends outside the mounting base 1; this design is also beneficial to locking the stud 6 after the adjustment is completed, preventing the adjusted stud 6 from retracting and causing a change in the pressing force of the presser foot body 2. For example, in this embodiment, the adjusted stud 6 is locked by a locking nut 7 to prevent the adjusted stud 6 from retracting; when the locking nut 7 is connected to the stud 6, the locking nut 7 is threadedly sleeved on the stud 6. After the adjustment of the stud 6 is completed, the locking nut 7 is screwed to make the locking nut 7 contact and press against the mounting base 1. Preferably, a groove 14 can be provided on the mounting base 1 to cooperate with the locking nut 7. The groove 14 is recessed from the surface of the mounting base 1 into the mounting base 1 in the axial direction of the stud 6, and the groove 14 has a mating surface 141 for the locking nut 7 to contact and press against. Among them, the groove 14 can accommodate the locking nut 7, and through the contact and pressing between the mating surface 141 and the locking nut 7, it can better prevent the nut from loosening due to the vibration generated during the operation of the sewing machine, so as to ensure the anti-retraction effect of the locking nut 7 on the stud 6. More preferably, the presser foot 100 further includes a stop member sleeved on the stud 6, and the stop member abuts between the mating surface 141 and the locking nut 7; the stop member can further prevent the nut from loosening due to vibration. Among them, the stop member can be a spring washer, a disc spring or a corrugated spring.

[0039] In addition, a card slot 61 is preferably provided at the end of the stud 6 extending outside the mounting base 1. The card slot 61 is recessed from the end face of the stud 6 into the stud 6. Among them, the card slot 61 can be a slotted hole, a cross slot or a polygonal slot; this design enables the pressing force of the presser foot body 2 to be adjusted by a tool (such as a screwdriver, a hex wrench, etc.) to quickly adjust the stud 6, and then makes the rotational adjustment of the stud 6 easier to operate; of course, as another alternative solution, in other embodiments, an operation knob portion can also be provided at the end of the stud 6 extending outside the mounting base 1, so that when the stud 6 is rotationally adjusted, no tool is needed, and the stud 6 can be rotationally adjusted only by manually operating the operation knob portion, making the rotational adjustment of the stud 6 more convenient.

[0040] To take care of the user's sense of use and operating habits, so that the user can use the presser foot 100 and the adjusting stud 6 in the most comfortable state, the position of the threaded hole 12 can be set as follows: In this embodiment, on the bottom surface of the presser foot body 2, the projections at both ends of the threaded hole 12 are distributed along the material transfer direction of the presser foot 100, and the end of the stud 6 extending outside the mounting seat 1 is close to the side of the front guiding arc plate 22; As another alternative solution, in other embodiments, on the bottom surface of the presser foot body 2, the projections at both ends of the threaded hole 12 are distributed along the rotation axis of the presser foot body 2. More preferably, the part of the stud 6 extending outside the mounting seat 1 is located obliquely above the threaded hole 12, so that the user can better operate the stud 6 to rotate.

[0041] When it is necessary to increase the pressing force of the presser foot body 2, rotate the adjusting stud 6 so that the stud 6 pushes the extrusion member 5 to move into the columnar through hole 13.

[0042] Furthermore, the compression amount of the elastic member 4 is increased, and the elastic potential energy of the elastic member 4 is increased (that is, the pressure exerted by the elastic member 4 on the presser foot body 2 is increased), and finally the pressing force of the presser foot body 2 is increased; When it is necessary to reduce the pressing force of the presser foot body 2, rotate the adjusting stud 6 in the reverse direction, so that the stud 6 reduces the pushing amplitude of the extrusion member 5 or releases the oppression on the extrusion member 5, and then the elastic member 4 can release the elastic potential energy to move the extrusion member 5 into the threaded hole 12, thereby reducing the pressure exerted by the elastic member 4 on the presser foot body 2 and realizing the reduction of the pressing force of the presser foot body 2.

[0043] In summary, through the design of this presser foot 100, when adjusting the pressing force of the presser foot body 2, it is not necessary to disassemble and assemble the mounting seat 1 and the presser foot body 2, nor to replace the elastic member 4. The adjustment of the pressing force of the presser foot body 2 is simpler and easier to operate, and has strong adjustment flexibility, high adjustment efficiency, time-saving and labor-saving, which is beneficial to improving work efficiency.

[0044] Sewing machine embodiment

[0045] The sewing machine includes the presser foot described in the above presser foot embodiment. Through the above presser foot, when adjusting the pressing force of the presser foot body, it only needs to rotate the adjusting stud, and there is no need to disassemble and assemble the mounting seat and the presser foot body, nor to replace the elastic member. The adjustment of the pressing force of the presser foot body is simpler and easier to operate, and has strong adjustment flexibility, high adjustment efficiency, time-saving and labor-saving, which is beneficial to improving work efficiency.

[0046] Finally, it should be emphasized that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Presser foot, comprising a mounting base and a presser foot body, the presser foot body being rotatably mounted at the lower end of the mounting base, characterized in that: The mounting base is provided with a threaded hole and a columnar through hole, the threaded hole being inclined to the lifting direction of the presser foot, the first orifice of the columnar through hole being formed at the bottom of the mounting base, the second orifice of the columnar through hole communicating with the threaded hole, the columnar through hole being inclined to the threaded hole; The presser foot further comprises an elastic member, a pressing member and a stud, the elastic member and the pressing member being arranged in the columnar through hole, the elastic member abutting between the presser foot body and the pressing member, a part of the pressing member being capable of extending into the threaded hole, at least a part of the stud being mounted in the threaded hole and abutting against the pressing member, the stud being capable of forcing the pressing member to move towards the presser foot body.

2. The presser foot according to claim 1, characterized in that: A part of the stud is mounted in the threaded hole and the other part extends outside the mounting base.

3. The presser foot according to claim 2, characterized in that: A card slot is provided at the end of the stud extending outside the mounting base, the card slot being recessed from the end face of the stud towards the inside of the stud, the card slot being a flat slot, a cross slot or a polygonal slot, or An operating knob portion is provided at the end of the stud extending outside the mounting base.

4. The presser foot according to claim 2, characterized in that: The presser foot further comprises a locking nut, the locking nut being threadedly connected to the stud and contacting the mounting base.

5. The presser foot according to claim 4, characterized in that: A groove is further provided on the mounting base, the groove being recessed from the surface of the mounting base towards the inside of the mounting base in the axial direction of the threaded hole, the groove having a mating surface, the mating surface contacting the locking nut; The presser foot further comprises a stop member, the stop member being sleeved on the stud, the stop member abutting between the mating surface and the locking nut, the stop member being a spring washer, a disc spring or a corrugated spring.

6. The presser foot according to claim 1, characterized in that: The elastic member is a compression spring; The pressing member is spherical, the first diameter of the pressing member being larger than the inner diameter of the compression spring.

7. The presser foot according to claim 1, characterized in that: On the bottom surface of the presser foot body, the projections at both ends of the threaded hole are distributed along the material transfer direction of the presser foot; or On the bottom surface of the presser foot body, the projections at both ends of the threaded hole are distributed along the rotation axis of the presser foot body.

8. The presser foot according to any one of claims 1 to 7, characterized in that: Two symmetrically arranged connecting ears are provided on the presser foot body, a first pin hole is provided on the connecting ears, and a slot is formed between the two connecting ears; A second pin hole mating with the first pin hole is provided at the lower end of the mounting base, and the lower end of the mounting base is inserted into the slot; The presser foot further comprises a pin shaft, the pin shaft being inserted into the two first pin holes and the second pin hole.

9. The presser foot according to claim 8, characterized in that: The presser foot body has a bottom plate, a front guide arc plate and a rear guide arc plate. The connecting ear is formed on the bottom plate. In the material transfer direction of the presser foot, the bottom plate is located between the front guide arc plate and the rear guide arc plate. A needle dropping slot hole is provided on the bottom plate, and the needle dropping slot hole penetrates through the bottom plate in the lifting direction; The bottom of the mounting seat has an inclined surface, the inclined surface is inclined to the lifting direction, and a first distance between the inclined surface near the front guide arc plate side and the bottom plate is smaller than a second distance between the inclined surface near the rear guide arc plate side and the bottom plate; The columnar through hole is parallel to the lifting direction, and the included angle between the threaded hole and the columnar through hole is an obtuse angle; The part of the stud extending out of the mounting seat is located obliquely above the threaded hole.

10. Sewing machine, characterized in that, Comprising a presser foot according to any one of claims 1 to 9.

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