Presser foot height adjusting device and flat seaming machine

Abstract

The utility model relates to a presser foot height adjusting device and a flat seaming machine, the flat seaming machine comprises a first shell and a second shell which are mutually assembled, the first shell is provided with a needle plate, a needle plate frame for supporting the needle plate and a presser foot height adjusting device, the presser foot height adjusting device comprises a driving mechanism, a transmission mechanism, an adjusting mechanism and a presser foot assembly, the transmission mechanism enables the adjusting mechanism and the driving mechanism to be in transmission connection so as to drive the adjusting mechanism to reciprocate under driving of the driving mechanism, the adjusting mechanism comprises a pull rod, a lifting and pressing pull plate, a lifting and pressing shaft assembled with the lifting and pressing pull plate and a crank arranged at one end of the lifting and pressing shaft, an adjusting groove is formed in the lifting and pressing pull plate, and the first end of the pull rod is connected with the transmission mechanism. The second end of the pull rod is adjustably fixed to different positions of the adjusting groove through a fixing mechanism. The adjusting groove for the pull rod to slide to adjust the assembly position is formed in the lifting and pressing pull plate, so that the height adjustment operation of the presser foot is simple, stepless adjustment is achieved, and the overall applicability of the product is improved.

Description

Technical Field

[0001] The present application relates to the technical field of industrial sewing machines, and in particular to a presser foot height adjustment device and a flat sewing machine. Background Art

[0002] During the operation of an industrial sewing machine, the height of the presser foot needs to be adjusted due to the different sewing materials, so that the height of the presser foot is suitable for the thickness of the sewing materials.

[0003] The current stretch stitching process is usually divided into two types: three-needle five-thread process and two-needle three-thread process. The difference between the two-needle three-thread process is that the two-needle three-thread process does not require a needle feed, so the needle feed will be removed and the presser foot will be raised to facilitate loading and unloading; this is especially important when working with thicker fabrics. If the process requires a needle feed, the presser foot height needs to be lowered to avoid the presser foot from hitting the needle feed after it is raised.

[0004] In some existing product technologies, the presser foot height can be adjusted by fixing the draw hook in different holes; however, in actual operation, the draw hook is time-consuming and complicated to connect and remove with other structures, and the adjustment is not very convenient. At the same time, due to structural limitations, the presser foot height can only be adjusted in two levels, which is far from meeting the requirements for the use of different sewing materials.

[0005] Therefore, a presser foot height adjustment device is needed which is convenient for adjusting the presser foot height and can meet the requirements of different sewing materials. Summary of the invention

[0006] The present application provides a presser foot height adjustment device and a stretch sewing machine, which can realize stepless adjustment of the presser foot height, have a simple structure, and are easy to use.

[0007] The present application is implemented through the following technical scheme: a foot height adjustment device, including a driving mechanism, a transmission mechanism, an adjustment mechanism and a presser foot assembly, the transmission mechanism connects the adjustment mechanism with the driving mechanism to drive the adjustment mechanism to reciprocate under the drive of the driving mechanism, the adjustment mechanism includes a pull rod, a lifting and pressing plate, a lifting and pressing shaft assembled with the lifting and pressing plate, and a crank arranged at one end of the lifting and pressing shaft, the crank is rotatably connected to the presser foot assembly, the lifting and pressing plate is provided with an adjustment slot, the first end of the pull rod is connected to the transmission mechanism, and the second end of the pull rod is adjustably fixed to different positions of the adjustment slot through a locking mechanism.

[0008] Furthermore, the lifting and pressing plate includes an assembly part and an adjusting part, the assembly part is provided with a through hole for the lifting and pressing shaft to pass through, the adjusting groove is opened in the adjusting part, an adjusting plate is provided on one side of the adjusting part, a bending part is provided at the second end of the pull rod, an opening is provided on the adjusting plate to be assembled with the bending part and a sliding groove corresponding to the adjusting groove, a limiting hole is provided on at least one side of the adjusting groove, and the locking mechanism includes a first screw and a nut matching the first screw, the first screw passes through the sliding groove and the limiting hole and cooperates with the nut to assemble the adjusting plate and the lifting and pressing plate into one.

[0009] Furthermore, the lifting and pressing plate includes an assembly part and an adjustment part, the assembly part is provided with a through hole for the lifting and pressing shaft to pass through, the adjustment groove is opened in the adjustment part, the end of the pull rod is a horizontally extending assembly end, the locking mechanism is a nut matching the assembly end, a gasket is provided at the transition between the assembly end and the vertical end of the pull rod, and the assembly end passes through the adjustment groove and is assembled and fixed with the nut.

[0010] Furthermore, the driving mechanism is a stepper motor, and the transmission mechanism includes a presser foot lifting cam rotatably connected to the motor shaft of the stepper motor and a swing plate abutting against the presser foot lifting cam. The stepper motor drives the presser foot lifting cam to push the swing plate to move. A first assembly hole is provided on the swing plate, and the first end of the pull rod passes through the first assembly hole and is assembled with the swing plate.

[0011] Furthermore, a second assembly hole is provided at one end of the swing plate close to the presser foot lifting cam, a bearing adapted to the presser foot lifting cam and a second screw passing through the bearing is provided on one side of the swing plate, the second screw passes through the second assembly hole to fix the bearing to the swing plate, and gaskets are provided between the second screw and the bearing and between the bearing and the swing plate.

[0012] Furthermore, a groove located above the through hole is provided on the assembly portion of the lifting and pressing plate, and a lifting and pressing foot reset member partially embedded in the groove is provided on the lifting and pressing shaft to limit the radial movement of the lifting and pressing plate on the lifting and pressing shaft.

[0013] Furthermore, the lifting and pressing shaft is provided with a first sleeve located on the outside of the lifting and pressing plate and a second sleeve located on the outside of the lifting and pressing foot reset member, and the first sleeve or the second sleeve is provided with an axle spring, one end of the axle spring is against the lifting and pressing plate.

[0014] Furthermore, the presser foot assembly includes a presser foot shaft and a presser foot arranged at the bottom end of the presser foot shaft, the presser foot shaft is provided with a presser foot head, the presser foot head is provided with a presser foot head connecting plate rotatably connected to the crank, and the presser foot head connecting plate is assembled and fixed to the presser foot head by screws.

[0015] Furthermore, a pressure regulating screw assembly is sleeved inside the presser foot shaft, and the pressure regulating screw assembly and the presser foot shaft are assembled and fixed via the presser foot rolling head.

[0016] A flat sewing machine comprises a first shell and a second shell which are assembled with each other, wherein the first shell is provided with a needle plate and a needle plate frame supporting the needle plate, and comprises the presser foot height adjustment device as described above.

[0017] The presser foot height adjustment device and the interlock sewing machine provided by the present application change the position adjustment method of the lifting and pressing plate and the pull rod of the adjustment mechanism from the method of adjusting the presser foot height from the first position to the second position by fixing the pull rod and the two fixed holes on the lifting and pressing plate in the prior art to a method in which the pull rod slides in the adjustment groove of the lifting and pressing plate to any required presser foot height and is tightened. This breaks through the prior art adjustment mode of achieving two-level fixed presser foot height through two holes, and realizes stepless adjustment of the presser foot height without being restricted by the fixed position. The overall structure is simple, so that the presser foot height can be quickly adjusted according to the thickness of the sewing material, and the adaptability is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional assembly diagram of a flat seam sewing machine according to an exemplary embodiment of the present application.

[0019] Figure 2 It is a partial assembly schematic diagram of another angle of the interlock sewing machine of an illustrative embodiment of the present application.

[0020] Figure 3 It is a three-dimensional assembly diagram of a presser foot height adjustment device according to an illustrative embodiment of the present application.

[0021] Figure 4 It is a schematic diagram of the decomposition of the adjustment mechanism of an exemplary embodiment of the present application.

[0022] Figure 5 It is a schematic diagram of the decomposition of the adjustment mechanism of another exemplary embodiment of the present application.

[0023] Figure numerals: 100, interlock sewing machine; 1, first housing; 10, needle plate; 11, needle plate frame; 2, second housing; 20, receiving hole; 3, presser foot height adjustment device; 31, driving mechanism; 32, transmission mechanism; 33, presser foot lifting cam; 34, swing plate; 340, first assembly hole; 341, second assembly hole; 342, bearing; 343, second screw; 344, pin; 345, torsion spring; 4, adjustment mechanism; 40, pull rod; 401, bending portion; 402, assembly end; 403, vertical end; 404, gasket; 41, lifting and pressing plate; 410, assembly portion; 4101, through hole; 4102, groove; 411, adjustment portion; 41 12. Adjustment slot; 4113. Limit hole; 42. Lifting and pressing shaft; 420. First sleeve; 421. Second sleeve; 422. Shaft spring; 43. Crank; 44. Positioning pin; 45. Adjustment plate; 450. Opening hole; 451. Slide groove; 46. First screw; 47. Nut; 5. Presser foot assembly; 50. Presser foot shaft; 51. Presser foot; 52. Presser foot pressing head; 520. Fastening hole; 53. Presser foot pressing head connecting plate; 54. Third screw; 55. Bolt; 56. Fourth screw; 6. Pressure regulating screw assembly; 60. Screw; 61. Pressure regulating knob; 7. Presser foot lifting and resetting member; 70. Main body; 71. First assembly part; 711. Bump; 72. Fastener. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0030] See also Figures 1 to 5 As shown, the present application provides a flat sewing machine 100, comprising a first housing 1 and a second housing 2 assembled with each other, wherein a needle plate 10, a needle plate frame 11 supporting the needle plate 10, and a presser foot adapted to the needle plate 10 are arranged on the first housing 1. The flat sewing machine 100 is also provided with a presser foot height adjustment device 3 for adjusting the height of the presser foot.

[0031] Specifically, the presser foot height adjustment device 3 includes a driving mechanism 31, a transmission mechanism 32, an adjustment mechanism 4 and a presser foot assembly 5. The transmission mechanism 32 transmits and connects the adjustment mechanism with the driving mechanism 31 so as to drive the adjustment mechanism 4 to reciprocate under the drive of the driving mechanism. The adjustment mechanism 4 includes a pull rod 40, a lifting and pressing plate 41, a lifting and pressing shaft 42 assembled with the lifting and pressing plate, and a crank 43 arranged at one end of the lifting and pressing shaft. The crank 43 is rotatably connected to the presser foot assembly 5. The lifting and pressing plate 41 is provided with an adjustment slot 4112. The first end of the pull rod 40 is connected to the transmission mechanism 32. The second end of the pull rod 40 is adjustably fixed to different positions of the adjustment slot 4112 through a locking mechanism. In the embodiment of the present application, the adjustment slot is a strip structure. When the presser foot height needs to be adjusted, the locking mechanism is released from a fastening state, and then the second end of the pull rod 40 is slid along the adjustment slot to any desired position, and then the locking mechanism is adjusted to a locking state to adjust the presser foot height. During this adjustment process, the presser foot height adjustment range is not limited to the specific position of the pull rod assembly, and stepless adjustment can be achieved within the presser foot height range corresponding to the entire length of the adjustment slot. The operation is simple and the applicability is wider.

[0032] The presser foot assembly 5 includes a presser foot shaft 50 and a presser foot 51 disposed at the bottom end of the presser foot shaft 50. The presser foot 51 is elastically assembled at the bottom end of the presser foot shaft 50. The crank 43 is rotatably connected to the presser foot assembly 5. The adjustment mechanism drives the presser foot assembly 5 to move up and down. The lifting and pressing plate 41 is a plate-shaped metal part, and the pull rod 40 is a needle-shaped structure.

[0033] The presser foot shaft 50 is sleeved with a pressure regulating screw assembly 6. The pressure regulating screw assembly 6 includes a screw 60 partially sleeved in the presser foot shaft 50 and a pressure regulating knob 61 arranged at the top of the screw 60. The pressure regulating screw assembly and the presser foot shaft 50 are assembled and fixed by a presser foot clamp 52. The main body of the presser foot clamp 52 is sleeved on the presser foot shaft 50 and is fastened by means of a bolt 55 so that the presser foot shaft 50 and the screw 60 are assembled; the presser foot clamp 52 is provided with a presser foot clamp connecting plate 53 that is rotatably connected to the crank 43. The presser foot clamp connecting plate 53 is assembled and fixed to the presser foot clamp 52 by a third screw 54. Specifically, a fastening hole 520 is provided on the main body of the presser foot clamp 52, and the third screw 54 passes through the fastening hole 520 and abuts against the presser foot shaft 50 so that one end of the presser foot clamp connecting plate 53 is fixed to the presser foot clamp 52. One end of the crank 43 is fixed to the lifting and pressing shaft 42 via a positioning pin 44 , and the other end is assembled and fixed to the presser foot head connecting plate 53 via a fourth screw 56 .

[0034] The driving mechanism 31 is a stepper motor, which is assembled to the first housing 1 through a mounting seat. The transmission mechanism includes a presser foot lifting cam 33 rotatably connected to the motor shaft of the stepper motor and a swing plate 34 abutting against the presser foot lifting cam. The stepper motor drives the presser foot lifting cam 33 to push the swing plate 34 to move. The swing plate 34 is provided with a first assembly hole 340, and one end of the pull rod 40 passes through the first assembly hole 340 and is assembled with the swing plate 34. The swing plate 34 is assembled with the second housing 2 through a pin shaft 344, and a torsion spring 345 fixed to the swing plate is provided on the pin shaft 344 to ensure that the swing plate rotates around the pin shaft 344 under the drive of the stepper motor and realizes reciprocating motion under the action of the torsion spring 345.

[0035] A second assembly hole 341 is provided at one end of the swing plate 34 near the presser foot lifting cam 33. A bearing 342 adapted to the presser foot lifting cam 33 and a second screw 343 passing through the bearing are provided on one side of the swing plate 34. The second screw 343 passes through the second assembly hole 341 to fix the bearing 342 to the swing plate 34. Gaskets are provided between the second screw 343 and the bearing 342 and between the bearing 342 and the swing plate 34. Of course, a similar protrusion structure can also be provided on the swing plate 34 to cooperate with the presser foot lifting cam 33 to transmit the driving force of the stepping motor to the swing plate 34 to drive it to rotate.

[0036] In one embodiment, the lifting and pressing plate 41 includes an assembly portion 410 and an adjustment portion 411. The assembly portion 410 is provided with a through hole 4101 for the lifting and pressing shaft 42 to pass through. The adjustment groove 4112 is opened in the adjustment portion 411, and the adjustment groove 4112 is roughly a runway-shaped structure, and an adjustment plate 45 is provided on one side of the adjustment portion 411. A bending portion 401 is provided at the end of the pull rod 40. The adjustment plate 45 is a strip-shaped structure, and the adjustment plate 45 is provided with an opening 450 assembled with the bending portion 401 and a slide groove 451 corresponding to the adjustment groove 4112. A limiting hole 4113 is provided on at least one side of the adjustment groove 4112, and a first screw 46 passes through the slide groove 451 and the limiting hole 4113 and cooperates with a nut 47 to assemble the adjustment plate 45 and the lifting and pressing plate 41 into one. When the presser foot needs to be adjusted, the pull rod 40 is adjusted to a suitable position along the adjustment slot 4112 by loosening the nut 47, and then the height of the presser foot can be adjusted by locking the nut 47, which is simple and convenient to operate. In this embodiment, the first screw and the nut matched with the first screw are a locking mechanism.

[0037] In another embodiment, the lifting and pressing plate 41 includes an assembly portion 410 and an adjustment portion 411, the assembly portion 410 is provided with a through hole 4101 for the lifting and pressing shaft 42 to pass through, the adjustment slot 4112 is opened in the adjustment portion 411, the end of the pull rod 40 is a horizontally extending assembly end 402, a gasket 404 is provided at the transition between the assembly end 402 and the vertical end 403 of the pull rod 40, the assembly end passes through the adjustment slot 4112 and is assembled and fixed with a nut 47, and the nut is a locking mechanism in this embodiment. In this embodiment, there is no need to set up an adjustment plate 45 separately, and the overall structure is more compact.

[0038] In the embodiment of the present application, the assembly portion 410 of the lifting and pressing plate 41 is provided with a groove 4102 located above the through hole 4101. The lifting and pressing shaft 42 is provided with a lifting and pressing foot reset member 7 partially embedded in the groove 4102 to limit the radial movement of the lifting and pressing plate 41 on the lifting and pressing shaft 42. Specifically, the first body portion 70 of the lifting and pressing foot reset member 7 is sleeved on the lifting and pressing shaft 42, and the end of the first body portion 70 forms a first assembly portion 71, and the first assembly portion 71 is provided with an assembly hole, and a fastener 72 passes through the first assembly portion 71 to lock the lifting and pressing foot reset member 7 on the lifting and pressing shaft 42, and a protrusion 711 extends outward from the first assembly portion 71, and the protrusion 711 is embedded in the groove to prevent the lifting and pressing plate from rotating around the lifting and pressing shaft.

[0039] The lifting and pressing shaft 42 is provided with a first sleeve 420 located on the outside of the lifting and pressing plate 41 and a second sleeve 421 located on the outside of the presser foot lifting and restoring member 7, respectively. The first sleeve 420 or the second sleeve 421 is provided with an axle spring 422, and one end of the axle spring 422 abuts against the lifting and pressing plate 41. The first sleeve 420 and the second sleeve 421 are respectively received in the corresponding receiving holes 20 on the second housing 2 to prevent the lifting and pressing shaft 42 from rotating.

[0040] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A presser foot height adjustment device, characterized in that: It includes a driving mechanism, a transmission mechanism, an adjusting mechanism and a presser foot assembly. The transmission mechanism connects the adjusting mechanism with the driving mechanism so as to drive the adjusting mechanism to reciprocate under the drive of the driving mechanism. The adjusting mechanism includes a pull rod, a lifting and pressing plate, a lifting and pressing shaft assembled with the lifting and pressing plate, and a crank arranged at one end of the lifting and pressing shaft. The crank is rotatably connected to the presser foot assembly. The lifting and pressing plate is provided with an adjusting slot. The first end of the pull rod is connected to the transmission mechanism. The second end of the pull rod is adjustably fixed to different positions of the adjusting slot through a locking mechanism.

2. The presser foot height adjustment device according to claim 1, characterized in that: The lifting, pressing and pulling plate includes an assembly part and an adjusting part, the assembly part is provided with a through hole for the lifting and pressing shaft to pass through, the adjusting groove is opened in the adjusting part, an adjusting plate is provided on one side of the adjusting part, a bending part is provided at the second end of the pull rod, an opening is provided on the adjusting plate to be assembled with the bending part and a sliding groove corresponding to the adjusting groove, a limiting hole is provided on at least one side of the adjusting groove, the locking mechanism includes a first screw and a nut matching the first screw, the first screw passes through the sliding groove and the limiting hole and cooperates with the nut to assemble the adjusting plate and the lifting, pressing and pulling plate into one.

3. The presser foot height adjustment device according to claim 1, characterized in that: The lifting and pressing plate includes an assembly part and an adjustment part. The assembly part is provided with a through hole for the lifting and pressing shaft to pass through. The adjustment groove is opened in the adjustment part. The end of the pull rod is a horizontally extending assembly end. The locking mechanism is a nut matching the assembly end. A gasket is provided at the transition between the assembly end and the vertical end of the pull rod. The assembly end passes through the adjustment groove and is assembled and fixed with the nut.

4. The presser foot height adjustment device according to claim 2 or 3, characterized in that: The driving mechanism is a stepper motor, and the transmission mechanism includes a presser foot lifting cam rotatably connected to the motor shaft of the stepper motor and a swing plate abutting against the presser foot lifting cam. The stepper motor drives the presser foot lifting cam to push the swing plate to move. A first assembly hole is provided on the swing plate, and the first end of the pull rod passes through the first assembly hole and is assembled with the swing plate.

5. The presser foot height adjustment device according to claim 4, characterized in that: A second assembly hole is provided at one end of the swing plate close to the presser foot lifting cam, a bearing adapted to the presser foot lifting cam and a second screw passing through the bearing are provided on one side of the swing plate, the second screw passes through the second assembly hole to fix the bearing to the swing plate, and gaskets are provided between the second screw and the bearing and between the bearing and the swing plate.

6. The presser foot height adjustment device according to claim 5, characterized in that: A groove located above the through hole is provided on the assembly portion of the lifting and pressing plate, and a lifting and pressing foot reset member partially embedded in the groove is provided on the lifting and pressing shaft to limit the radial movement of the lifting and pressing plate on the lifting and pressing shaft.

7. The presser foot height adjustment device according to claim 6, characterized in that: The lifting and pressing shaft is provided with a first sleeve located on the outside of the lifting and pressing plate and a second sleeve located on the outside of the lifting and pressing foot reset member. The first sleeve or the second sleeve is provided with an axle spring, and one end of the axle spring is against the lifting and pressing plate.

8. The presser foot height adjustment device according to any one of claims 1 to 3, characterized in that: The presser foot assembly includes a presser foot shaft and a presser foot arranged at the bottom end of the presser foot shaft, the presser foot shaft is provided with a presser foot clamp, the presser foot clamp is provided with a presser foot clamp connecting plate rotatably connected to the crank, and the presser foot clamp connecting plate is assembled and fixed to the presser foot clamp by screws.

9. The presser foot height adjustment device according to claim 8, characterized in that: A pressure regulating screw assembly is sleeved inside the presser foot shaft, and the pressure regulating screw assembly is assembled and fixed to the presser foot shaft through the presser foot rolling head.

10. A flat sewing machine, comprising a first housing and a second housing assembled with each other, wherein a needle plate and a needle plate frame supporting the needle plate are arranged on the first housing, characterized in that: It comprises the presser foot height adjustment device as described in any one of claims 1 to 9.

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