A large foot assembly and a template machine

Abstract

The application discloses a large presser foot assembly and a template machine, which are assembled at the bottom of a large presser foot mounting plate of the template machine. The large presser foot assembly comprises a large presser foot base and two large presser foot pressing plates. The middle part of the large presser foot base is provided with a relief hole extending along a first direction, which is used for moving a needle of the template machine along the first direction to sew a fabric located in a template. The two large presser foot pressing plates are connected to the bottom of the large presser foot base through elastic members. The two large presser foot pressing plates are arranged at intervals in a second direction. When the large presser foot mounting plate drives the large presser foot base to move downward, the elastic members are used to press the two large presser foot pressing plates to tightly press the templates located on both sides of the needle in the second direction, so as to limit the relative movement of the templates and the fabric located in the templates. The action of the two large presser foot pressing plates is divided. When the templates have a height difference, only the extension and contraction amount of the elastic members is different. The displacement of the fabric relative to the templates in the sewing process caused by the height difference can be avoided, the sewing thread trace is prevented from being bent, and the shrinkage rate is reduced.

Description

Technical Field

[0001] This invention relates to the field of template machine technology, and in particular to a large presser foot assembly and a template machine. Background Technology

[0002] Currently, template sewing machines on the market generally have poor flatness after sewing. The existing technology to solve the problem of poor flatness is to attach horsehair interfacing to the template. When sewing, the horsehair interfacing provides some support for the seam when sewing the fabric, which increases the amount of surface thread and forms thread loops. The thread loops will tighten when the fabric is filled with down later. The horsehair interfacing has a certain effect on the flatness of the fabric.

[0003] However, because the horsehair lining itself has a certain thickness, the area where the horsehair lining is pasted on the template is thicker than the area where the horsehair lining is not pasted, resulting in a height difference on both sides of the seam. This causes the fabric to shift relative to the template during the sewing process, resulting in bent seam stitches and increased shrinkage.

[0004] Therefore, how to prevent the fabric from shifting relative to the template during the sewing process, so as to avoid the stitches from bending, is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a large presser foot assembly and template machine that can prevent the fabric from shifting relative to the template during the sewing process, thereby avoiding bending of the sewing stitches.

[0006] To achieve the above objectives, the present invention provides a large presser foot assembly, which is assembled at the bottom of the large presser foot mounting plate of a template machine, comprising:

[0007] The large presser foot has a clearance hole in the middle that extends in a first direction. The clearance hole is used to allow the needle of the template machine to move in the first direction to sew the fabric located inside the template.

[0008] Two large presser foot plates are connected to the bottom of the large presser foot base by elastic elements. The two large presser foot plates are spaced apart in the second direction. When the large presser foot mounting plate moves the large presser foot base downward, the elastic elements are used to press the two large presser foot plates against the templates located on both sides of the needle in the second direction, so as to restrict the relative movement of the templates and the fabric located in the templates. The second direction and the first direction are perpendicular to each other.

[0009] In one possible implementation, the bottom of the large presser foot base has two first grooves, which are located on both sides of the clearance hole in the third direction. The top of the large presser foot plate is provided with two protrusions, which are spaced apart in the third direction to correspond to the first grooves. The top surface of the first groove is provided with several second grooves. One end of the elastic member is located in the second groove, and the other end of the elastic member extends out of the second groove and is connected to the protrusion. The third direction is perpendicular to the first direction and the second direction.

[0010] In one possible implementation, the top of the protrusion extends into the first groove, and the top of the protrusion has extensions extending in the second direction on both sides. The bottom of the large pressure foot is connected to a limiting plate, which fits against the end face of the first groove and partially seals the first groove. The limiting plate has a limiting hole for the protrusion to move in the first direction, and the width of the limiting hole in the second direction is less than the distance between the opposite sides of the two extensions on the same protrusion. This allows the elastic element to drive the protrusion to move away from the second groove in the first direction and to abut against the limiting plate through the extensions to limit the movement of the protrusion.

[0011] In one possible implementation, there are two limiting plates, which are located on both sides of the clearance hole in the first direction. The limiting plates have a "mountain" shaped structure, including a fixing part extending in the second direction and a limiting part connected to the fixing part and extending in the third direction. A limiting hole is formed between adjacent limiting parts on the same limiting plate.

[0012] In one possible implementation, the fixing part is provided with a plurality of first fixing holes extending along a first direction, the first fixing holes being arranged sequentially along a second direction, the large pressure foot base being provided with second fixing holes corresponding to the first fixing holes, the second fixing holes being located on opposite sides of the two first grooves, and the first fixing member being connected to the corresponding first fixing holes and second fixing holes, so that the limiting plate is fixed relative to the large pressure foot base.

[0013] In one possible implementation, the protrusion has first inclined surfaces on both sides in the third direction, and the first inclined surfaces are located at the top of the protrusion. The first groove has a second inclined surface on at least one inner wall in the third direction, and the second inclined surface is located at the end of the first groove away from the second groove, so that the end of the first groove away from the second groove has a flared structure. The angle between the first inclined surface and the first direction and the angle between the second inclined surface and the first direction are equal, so that at least one first inclined surface can fit against the second inclined surface for guiding the top of the protrusion into the first groove.

[0014] In one possible implementation, there are multiple second grooves, and the multiple second grooves are arranged sequentially in the second direction. The top of the protrusion is provided with a third groove corresponding to the second groove. One end of the same elastic member extends into the second groove and the other end extends into the third groove. The axes of the corresponding second groove and the third groove are collinear, and the cross-sectional dimensions perpendicular to the extension and contraction direction of the elastic member are consistent.

[0015] In one possible implementation, the inner wall of the second groove is provided with a first snap-fit ​​protrusion, and the inner wall of the third groove is provided with a second snap-fit ​​protrusion. The first snap-fit ​​protrusion is used to restrict the elastic element from disengaging from the second groove, and the second snap-fit ​​protrusion is used to restrict the elastic element from disengaging from the third groove.

[0016] In one possible implementation, the bottom edge of the large pressure foot plate is rounded.

[0017] A template machine, comprising a large presser foot assembly as described in any of the above.

[0018] Compared to the aforementioned background technology, the large presser foot assembly provided by the present invention is assembled at the bottom of the large presser foot mounting plate of a template machine, including a large presser foot base and two large presser foot plates. The large presser foot base has a clearance hole extending in the middle along a first direction, which is used for the needle of the template machine to move in the first direction to sew the fabric located in the template. The two large presser foot plates are connected to the bottom of the large presser foot base by an elastic member. The two large presser foot plates are spaced apart in a second direction. The elastic member is used to press the two large presser foot plates against the template located on both sides of the needle in the second direction when the large presser foot mounting plate moves the large presser foot base downward, so as to restrict the relative movement of the template and the fabric located in the template. The second direction and the first direction are perpendicular to each other.

[0019] Specifically, a large presser foot base is simultaneously connected to two large presser foot plates spaced apart in the second direction. One of the two large presser foot plates is used to press the template located on one side of the needle in the second direction, and the other large presser foot plate is used to press the template located on the other side of the needle in the second direction. The large presser foot plates and the large presser foot base are connected by elastic elements. The actions of the two large presser foot plates are separated. When either large presser foot plate contacts the template, the connected elastic element is compressed. When the template has a height difference, only the amount of expansion and contraction of the elastic element is different, but the large presser foot plates can press against the template under the action of the elastic element. This can avoid the displacement of the fabric relative to the template during the sewing process caused by the height difference in the prior art, which causes the large presser foot to only press the template on the side of the needle. This avoids the bending of the sewing stitch and reduces the shrinkage rate. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the large pressure foot assembly provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 The main view;

[0023] Figure 3 for Figure 1 Side view;

[0024] Figure 4 for Figure 1 Top view;

[0025] Figure 5 This is a schematic diagram of the structure of the large pressure foot seat provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the large pressure foot plate provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the limiting plate provided in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the assembly of the limiting plate and the large pressure foot seat provided in an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the structure in which the limiting plate and the large pressure foot plate are assembled with the large pressure foot seat, as provided in the embodiment of the present invention.

[0030] in:

[0031] 100 - Large pressure foot base, 110 - Clearance hole, 120 - First groove, 121 - Second inclined surface, 130 - Second groove, 140 - Second fixing hole, 150 - Mounting hole;

[0032] 200 - Large presser foot plate, 210 - Protrusion, 211 - First inclined surface, 212 - Third groove, 220 - Extension body;

[0033] 400-Limiting plate, 410-Limiting hole, 420-Fixing part, 421-First fixing hole, 430-Limiting part. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] In the description of this invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this invention.

[0037] The purpose of this invention is to provide a large presser foot assembly and template machine that can prevent the fabric from shifting relative to the template during the sewing process, thereby avoiding bending of the sewing stitches.

[0038] It should be noted that in this embodiment, the X direction in the attached figure is defined as the first direction, the Y direction as the second direction, and the Z direction as the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0039] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 To achieve the above objectives, the present invention provides a large presser foot assembly, which is assembled on the bottom of the large presser foot mounting plate of a template machine. The large presser foot assembly includes a large presser foot seat 100 and two large presser foot plates 200. The large presser foot seat 100 is used to connect with the bottom of the large presser foot mounting plate. The large presser foot seat 100 is provided with mounting holes 150, which are through holes or threaded holes. The large presser foot mounting plate is also provided with corresponding through holes or threaded holes. By the insertion and fixing of the connecting parts, the large presser foot seat 100 and the large presser foot mounting plate can be relatively fixed. When the large presser foot mounting plate moves, the large presser foot seat 100 can move synchronously. For example, the large presser foot mounting plate drives the large presser foot seat 100 to move synchronously in a first direction, that is, the large presser foot mounting plate drives the large presser foot seat 100 to move synchronously up or down.

[0040] The large presser foot 100 is used to press the template. The template is a fixing tool that can be placed on the sewing table to fix the fabric. The template makes the fabric flat and easy to sew. The large presser foot 100 has a clearance hole 110 extending in the first direction in the middle. The clearance hole 110 is used to allow the needle of the template machine to move in the first direction to sew the fabric located in the template. The clearance hole 110 provides clearance space for the movement of the needle. The needle moves up and down in the first direction without horizontal displacement. The large presser foot 100 also does not move. Only the template drives the fabric to move synchronously along the preset trajectory. A horsehair lining is pasted inside the template. The horsehair lining provides a certain support for the sewing thread, resulting in an increase in the amount of thread and the formation of thread loops.

[0041] Two large presser foot plates 200 are connected to the bottom of the large presser foot base 100 by elastic elements. The two large presser foot plates 200 are spaced apart in the second direction. The gap between the two large presser foot plates 200 also provides clearance space for the movement of the needle in the first direction. When the large presser foot mounting plate moves the large presser foot base 100 downward, the elastic elements are used to press the two large presser foot plates 200 against the templates located on both sides of the needle in the second direction, so as to restrict the relative movement of the templates and the fabric located in the templates. The bottom edge of the large presser foot plates 200 is rounded to avoid the templates from abutting or rubbing against the bottom of the large presser foot plates 200, which would cause damage to the templates.

[0042] Two large presser foot plates 200, spaced apart in the second direction, are simultaneously connected to a large presser foot base 100. One of the two large presser foot plates 200 is used to press the template located on one side of the needle in the second direction, and the other large presser foot plate 200 is used to press the template located on the other side of the needle in the second direction. The large presser foot plates 200 and the large presser foot base 100 are connected by elastic elements. The actions of the two large presser foot plates 200 are separated. When either large presser foot plate 200 contacts the template, the connected elastic element is compressed. When the template has a height difference, only the amount of expansion and contraction of the elastic element is different, but the large presser foot plates 200 can press the template tightly under the action of the elastic element. This can avoid the displacement of the fabric relative to the template during sewing caused by the height difference in the prior art, which causes the large presser foot to only press the template on the side of the needle. This avoids the bending of the sewing stitch and reduces the shrinkage rate.

[0043] Please see Figure 5 and Figure 6In one possible implementation, the bottom of the large presser foot base 100 has two first grooves 120, which are located on both sides of the clearance hole 110 in the third direction. Preferably, the first grooves 120 penetrate the large presser foot base 100 in the second direction. The top of each large presser foot plate 200 is provided with two protrusions 210. The two protrusions 210 of the same large presser foot plate 200 are spaced apart in the third direction to correspond to the first grooves 120, that is, the two protrusions 210 of the same large presser foot plate 200 are arranged at intervals in the third direction to correspond to the first grooves 120. One protrusion 210 corresponds to one of the first grooves 120 and another protrusion 210 corresponds to another of the first grooves 120. The top surface of the first groove 120 is provided with a plurality of second grooves 130. The top surface of the first groove 120 refers to an inner wall of the first groove 120 that is away from the large pressure foot plate 200. One end of the elastic element is located inside the second groove 130, and the other end of the elastic element extends to the outside of the second groove 130 and is connected to the protrusion 210. The elastic element can be, but is not limited to, a spring.

[0044] The two protrusions 210 of the large presser foot plate 200 correspond one-to-one with the two first grooves 120 of the large presser foot base 100. A second groove 130 is formed on the first groove 120 away from the inner wall of the large presser foot plate 200. This allows an elastic element, with one end located inside the second groove 130 and the other end extending outside and connected to the protrusion 210, to compress when the large presser foot plate 200 and the large presser foot base 100 move towards each other. For example, when the large presser foot base 100 moves towards the template under the action of the large presser foot mounting plate, the large presser foot plate, connected to the bottom of the large presser foot base 100 by the elastic element... The presser foot 200 contacts the template, which restricts the downward movement of the presser foot 200. As the presser foot 100 continues to move downward, the distance between the presser foot 200 and the presser foot 100 is reduced, causing the elastic element to be compressed. After the presser foot 100 moves to its position, the distance between the presser foot 100 and the presser foot 200 no longer changes. The compressed elastic element causes the presser foot 100 and the presser foot 200 to tend to move in opposite directions, causing the presser foot 200 to press the template tightly, thereby ensuring that the template presses the fabric tightly and achieving synchronous movement of the template and the fabric.

[0045] Please see Figure 7 , Figure 8 and Figure 9 In one possible implementation, the top of the protrusion 210 extends into the first groove 120, and the top of the protrusion 210 has extensions 220 extending in the second direction on both sides. The bottom of the large pressure foot 100 is connected to a limiting plate 400, which fits against the end face of the first groove 120 and partially seals the first groove 120. The end face of the first groove 120 refers to the end plane where the first groove 120 is formed (as shown in the attached figure). Figure 3The bottom surface of the pressure foot seat 100) and the limiting plate 400 are provided with limiting holes 410 for the protrusion 210 to move in the first direction. The width of the limiting hole 410 in the second direction is less than the distance between the two extension bodies 220 on the same protrusion 210 on opposite sides. This allows the elastic member to drive the protrusion 210 to move away from the second groove 130 in the first direction and to abut against the limiting plate 400 through the extension bodies 220 to limit the movement of the protrusion 210.

[0046] The width of the protrusion 210 in the third direction is smaller than the width of the first groove 120 in the third direction, allowing the protrusion 210 to enter the first groove 120 along the first direction. The first groove 120 provides clearance for the movement of the protrusion 210 when the large pressure foot plate 200 and the large pressure foot base 100 move towards each other. To facilitate guiding the movement of the protrusion 210, a limiting plate 400 is connected to the bottom of the large pressure foot base 100. The limiting plate 400 has a groove that is aligned with the protrusion 210 in the second direction. The matching limiting hole 410 prevents the protrusion 210 from shifting in the second direction through the inner wall of the limiting hole 410 in the second direction, ensuring the distance between the two large pressure foot plates 200 in the second direction. At the same time, the width of the first groove 120 in the third direction is the effective width of the limiting hole 410 in the third direction. Since the width of the first groove 120 in the third direction is slightly larger than the width of the protrusion 210 in the third direction, it allows the large pressure foot plates 200 to wobble slightly in the third direction.

[0047] The top of the protrusion 210 has extensions 220 extending in the second direction on both sides. The extensions 220 make the width of the top of the protrusion 210 in the second direction greater than the width of the limiting hole 410 in the second direction. This can prevent the protrusion 210, whose top is located in the first groove 120, from completely detaching from the first groove 120 in the first direction. This limits the maximum distance of the large presser foot plate 200 and the large presser foot seat 100 moving away from each other. That is, when the protrusion 210 with the extensions 220 abuts against the limiting plate 400 under the action of the elastic member, it is the limit position of the large presser foot plate 200 and the large presser foot seat 100 moving away from each other.

[0048] In one possible implementation, there are two limiting plates 400, located on both sides of the clearance hole 110 in the first direction. The limiting plates 400 have a "mountain" shaped structure, including a fixing part 420 extending in the second direction and a limiting part 430 connected to the fixing part 420 and extending in the third direction. There are three limiting parts 430, and the three limiting parts 430 are spaced apart in the second direction. A limiting hole 410 is formed between adjacent limiting parts 430 on the same limiting plate 400. That is, a limiting hole 410 for limiting one protrusion 210 of the large pressure foot plate 200 is formed between the first limiting part 430 and the second limiting part 430, and a limiting hole 410 for limiting one protrusion 210 of the other large pressure foot plate 200 is formed between the second limiting part 430 and the third limiting part 430. There are two limiting plates 400 in total, and each limiting plate 400 is used to limit the movement of the two large pressure foot plates 200.

[0049] In one possible implementation, the fixing part 420 is provided with a plurality of first fixing holes 421 extending along a first direction, and the first fixing holes 421 are arranged sequentially along a second direction. The large pressure foot seat 100 is provided with second fixing holes 140 corresponding to the first fixing holes 421. The second fixing holes 140 are located on the side opposite to the two first grooves 120, that is, the fixing part 420 is located on the side opposite to the two first grooves 120, so that the limiting part 430 can cooperate with the first groove 120 to limit the movement of the protrusion 210. The second fixing hole 140 is preferably a stepped hole. That is, the second fixing hole 140 includes a first hole with a larger cross-sectional size and a second hole with a smaller cross-sectional size. The first hole is located on the side of the second hole away from the fixing part 420. A shoulder is formed between the first hole and the second hole. The first fixing member is connected to the corresponding first fixing hole 421 and second fixing hole 140. For example, the first fixing hole 421 is a threaded hole. The first fixing member includes a rod head and a rod body connected to the rod head. The rod head abuts against the shoulder, and the rod body is inserted into the second hole, screwed into and connected to the first fixing hole 421, so that the limiting plate 400 is fixed relative to the large pressure foot seat 100.

[0050] In one possible implementation, the protrusion 210 has first inclined surfaces 211 on both sides in the third direction, and the first inclined surfaces 211 are located on the top of the protrusion 210. The first groove 120 has a second inclined surface 121 on at least one inner wall in the third direction. The second inclined surface 121 is located at the end of the first groove 120 away from the second groove 130, so that the end of the first groove 120 away from the second groove 130 has a flared structure. The angle between the first inclined surface 211 and the first direction and the angle between the second inclined surface 121 and the first direction are equal, for example, both are 45°, so that at least one first inclined surface 211 can fit against the second inclined surface 121 for guiding the top of the protrusion 210 into the first groove 120, so that the top of the protrusion 210 can enter into the first groove 120.

[0051] In one possible implementation, there are multiple second grooves 130, and the multiple second grooves 130 are arranged sequentially in the second direction. The top of the protrusion 210 is provided with a third groove 212 corresponding to the second groove 130. One end of the same elastic member extends into the second groove 130 and the other end extends into the third groove 212. The axes of the corresponding second grooves 130 and third grooves 212 are collinear, and their cross-sectional dimensions perpendicular to the extension and contraction direction of the elastic member are consistent.

[0052] Two adjacent third grooves 212 can be provided on the top of the same protrusion 210. The two adjacent third grooves 212 are spaced apart in the second direction. Each first groove 120 is provided with four second grooves 130. Two of the four grooves correspond to the two third grooves 212 on the top of the same protrusion 210, and two of the four grooves correspond to the two third grooves 212 on the top of another protrusion 210. By assembling the elastic element into the corresponding upper and lower second grooves 130 and third grooves 212, when the large pressure foot plate 200 and the large pressure foot seat 100 move towards each other, the elastic element is compressed by the inner wall of the second groove 130 and the third groove 212 on the opposite side. At the same time, the circumferential walls of the second groove 130 and the third groove 212 are used to limit the elastic element and prevent the elastic element from moving horizontally.

[0053] Furthermore, the inner wall of the second groove 130 is provided with a first snap-fit ​​protrusion, and the inner wall of the third groove 212 is provided with a second snap-fit ​​protrusion. The first snap-fit ​​protrusion is used to restrict the elastic element from disengaging from the second groove 130, and the second snap-fit ​​protrusion is used to restrict the elastic element from disengaging from the third groove 212, so as to enhance the fixing effect on the elastic element.

[0054] Furthermore, a distance detector can be installed on the side of the large presser foot plate 200 facing the large presser foot base 100. The distance detector can determine the distance between the large presser foot plate 200 and the large presser foot base 100, thus determining the compression of the spring between them. For example, initially, the spring is at its natural length, and the large presser foot plate 200 is supported on the limiting plate 400 via the extension body 220. When the distance between the large presser foot plate 200 and the large presser foot base 100 changes, the compression of the spring can be determined accordingly. The magnitude of the force between the spring and the large presser foot plate 200 is calculated, and the pressure exerted by the large presser foot plate 200 on the template is further calculated based on the contact area between the large presser foot plate 200 and the template. When the pressure exerted by both large presser foot plates 200 on the template reaches the preset value, the large presser foot mounting plate is controlled to stop moving downward, so that the large presser foot seat 100 maintains the preset height. When the fabric is different, the preset value of the pressure exerted by the large presser foot plate 200 on the template can be set differently to ensure that the large presser foot plate 200 has a pressing effect on the template while avoiding excessive pressure that may affect the movement of the template.

[0055] This application also provides a template machine, which includes the large presser foot assembly as described above, and also has the beneficial effects of the large presser foot assembly described above, which will not be repeated here.

[0056] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A large presser foot assembly, assembled at the bottom of the large presser foot mounting plate of a template machine, characterized in that, include: The large presser foot (100) has a clearance hole (110) extending in the middle along a first direction. The clearance hole (110) is used to allow the needle of the template machine to move along the first direction to sew the fabric located in the template. Two large presser foot plates (200) are connected to the bottom of the large presser foot base (100) by elastic elements. The two large presser foot plates (200) are spaced apart in the second direction. The elastic elements are used to press the two large presser foot plates (200) against the templates located on both sides of the needle in the second direction when the large presser foot mounting plate moves the large presser foot base (100) downward, so as to restrict the relative movement of the templates and the fabric located in the templates. The second direction and the first direction are perpendicular to each other. The bottom of the large presser foot (100) has two first grooves (120), which are located on both sides of the clearance hole (110) in the third direction. The top of the large presser foot plate (200) is provided with two protrusions (210). The two protrusions (210) of the same large presser foot plate (200) are spaced apart in the third direction to correspond to the first grooves (120). The top surface of the first groove (120) is provided with a plurality of second grooves (130). One end of the elastic member is located in the second groove (130), and the other end of the elastic member extends to the outside of the second groove (130) and is connected to the protrusion (210). The third direction is perpendicular to the first direction and the second direction. The top of the protrusion (210) extends into the first groove (120), and the top of the protrusion (210) has extensions (220) extending along the second direction on both sides in the second direction. The bottom of the large pressure foot (100) is connected to a limiting plate (400). The limiting plate (400) fits against the end face of the first groove (120) and partially seals the first groove (120). The limiting plate (400) is provided for the protrusion (210) to... The limiting hole (410) moves along the first direction, and the width of the limiting hole (410) in the second direction is less than the distance between the two extensions (220) on the same protrusion (210) on opposite sides, so that the elastic member can drive the protrusion (210) to move away from the second groove (130) in the first direction and abut against the limiting plate (400) through the extension (220) to limit the movement of the protrusion (210).

2. The large pressure foot assembly according to claim 1, characterized in that, There are two limiting plates (400), which are respectively located on both sides of the clearance hole (110) in the first direction. The limiting plate (400) has a "mountain" shaped structure, including a fixing part (420) extending along the second direction, and a limiting part (430) connected to the fixing part (420) and extending along the third direction. The limiting hole (410) is formed between adjacent limiting parts (430) on the same limiting plate (400).

3. The large pressure foot assembly according to claim 2, characterized in that, The fixing part (420) is provided with a plurality of first fixing holes (421) extending along the first direction. The first fixing holes (421) are arranged sequentially along the second direction. The large pressure foot seat (100) is provided with a second fixing hole (140) corresponding to the first fixing hole (421). The second fixing hole (140) is located on the opposite side of the two first grooves (120). The first fixing member is connected to the corresponding first fixing hole (421) and the second fixing hole (140) so that the limiting plate (400) is fixed relative to the large pressure foot seat (100).

4. The large pressure foot assembly according to claim 2, characterized in that, The protrusion (210) has a first inclined surface (211) on both sides in the third direction, and the first inclined surface (211) is located on the top of the protrusion (210). The first groove (120) has a second inclined surface (121) on at least one inner wall in the third direction. The second inclined surface (121) is located at the end of the first groove (120) away from the second groove (130), so that the end of the first groove (120) away from the second groove (130) has a flared structure. The angle between the first inclined surface (211) and the first direction and the angle between the second inclined surface (121) and the first direction are equal, so that at least one first inclined surface (211) can fit against the second inclined surface (121) for guiding the top of the protrusion (210) into the first groove (120).

5. The large pressure foot assembly according to claim 2, characterized in that, There are multiple second grooves (130), and multiple second grooves (130) are arranged sequentially in the second direction. The top of the protrusion (210) is provided with a third groove (212) corresponding to the second groove (130). One end of the same elastic member extends into the second groove (130) and the other end extends into the third groove (212). The axes of the corresponding second groove (130) and the third groove (212) are collinear, and their cross-sectional dimensions perpendicular to the extension and contraction direction of the elastic member are consistent.

6. The large pressure foot assembly according to claim 5, characterized in that, The inner wall of the second groove (130) is provided with a first snap-fit ​​protrusion, and the inner wall of the third groove (212) is provided with a second snap-fit ​​protrusion. The first snap-fit ​​protrusion is used to restrict the elastic element from disengaging from the second groove (130), and the second snap-fit ​​protrusion is used to restrict the elastic element from disengaging from the third groove (212).

7. The large pressure foot assembly according to any one of claims 1-6, characterized in that, The bottom edge of the large presser foot plate (200) is rounded.

8. A template machine, characterized in that, Includes the large presser foot assembly as described in any one of claims 1-7.

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