CN111472106A - Automatic presser foot lifting and adjusting mechanism of sewing machine - Google Patents
Automatic presser foot lifting and adjusting mechanism of sewing machine Download PDFInfo
- Publication number
- CN111472106A CN111472106A CN202010476552.5A CN202010476552A CN111472106A CN 111472106 A CN111472106 A CN 111472106A CN 202010476552 A CN202010476552 A CN 202010476552A CN 111472106 A CN111472106 A CN 111472106A
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- presser foot
- pressure regulating
- pressure
- sewing machine
- presser
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention discloses an automatic presser foot lifting and adjusting mechanism of a sewing machine, which comprises a stepping motor, a pressure regulating driving cam, a spring plate pressing plate, a pull rod, a roller, a swing rod, a salad center seat set, a presser bar fixing seat and a presser bar presser foot component, wherein the pressure regulating driving cam is fixedly installed at the output end of the stepping motor, a mounting hole is formed in the back surface of the pressure regulating driving cam, the pressure regulating driving cam is fixed at the output end of the stepping motor through the mounting hole, and a spiral curved surface is arranged on the front surface of the pressure regulating driving cam; according to the automatic pressure bar and foot lifting mechanism, the stepping motor is used as a motive power for automatically lifting the pressure foot, the stepping motor is arranged at a position close to the pressure foot, the lifting and the lowering of the pressure bar and foot lifting assembly are controlled through the pressure regulating driving cam and the elastic sheet pressing plate, the transmission mechanism is simplified, and the elastic force of the elastic sheet pressing plate is synchronously reduced when the pressure bar and foot lifting assembly is automatically lifted; the pressure of the presser foot component can be automatically adjusted, and the adjusting action is simplified.
Description
Technical Field
The invention relates to the technical field of sewing machines, in particular to an automatic presser foot lifting and adjusting mechanism of a sewing machine.
Background
The function of lifting the presser foot is required to be possessed by the sewing machine; in the sewing process, the presser foot is put down, the pressure generated by the presser foot acts on the sewing material to flatten the sewing material, so that the sewing thread can be tightened; when the material is required to be taken and discharged, or the pressure foot is required to be lifted when the direction is turned in the sewing process; the presser foot lifting mechanism on the roller machine is to realize the three modes of presser foot lifting, namely automatic presser foot lifting, hand-held presser foot lifting and knee-rest presser foot lifting. The roller type presser foot is arranged on the presser bar, the presser bar is arranged in the vertical direction, and the driving link is used for lifting or lowering the presser bar through the motion conversion of the presser foot lifting mechanism, so that the presser foot is lifted or put down; the pressure of the presser foot is provided by a spring plate pressing plate, and the compression deformation amount of the spring plate pressing plate can be adjusted through a pressure adjusting screw, so that the pressure of the presser foot is adjusted.
The existing automatic presser foot lifting mechanism and presser foot pressure adjusting mechanism of a sewing machine are composed of a presser foot lifting electromagnet, an arch component, a presser foot long shaft, an upper conveying arm, a lower conveying arm, an arch connecting lever, a salad core seat group, a presser bar fixing seat, a presser bar, a presser foot component, an elastic sheet pressing plate and a pressure adjusting screw.
The presser foot lifting electromagnet is fixed on the bottom plate as a power source and props against a connecting shaft on the foot bow component, and the foot bow component and the upper and lower conveying arms are respectively fixed at the lower end and the upper end of the presser foot long shaft and swing left and right by taking the presser foot long shaft as an axis. One end of the foot bow connecting lever is hinged with the upper and lower conveying arms, the other end is hooked with the salad core seat group, and the salad core seat group and the supporting screw are hinged on the shell and can swing around the shell. One end face of the pressing rod fixing seat leans against the salad center seat group, the pressing foot component and the pressing rod fixing seat are respectively fixed on the pressing rod, and the pressing rod can slide up and down. One end of the elastic sheet pressing plate is hinged to the pin shaft, the other end of the elastic sheet pressing plate is placed on the pressing rod fixing seat, and the pressure regulating screw is pressed on the elastic sheet pressing plate, so that the elastic sheet pressing plate deforms to form pressure of the pressure foot.
When the electromagnet for lifting the presser foot is electrified, the iron core extends out to drive the series of transmission mechanisms, so that the salad center base group rotates around the supporting screw to lift the height of the pressing rod fixing base, the presser foot is driven to be synchronously lifted by upward sliding of the pressing rod, after the electromagnet for lifting the presser foot is powered off, the iron core retracts, the transmission mechanisms lose supporting force, and the presser foot is quickly reset under the action of the elastic sheet pressing plate; when the pressure of the presser foot is to be adjusted, the compression amount of the elastic sheet pressing plate can be changed by adjusting the pressure adjusting screw.
However, the conventional pressure foot has some disadvantages in the use process, such as:
because the electromagnet is arranged at the bottom plate and is far away from the presser foot, the number of transmission mechanisms for automatically lifting the presser foot is large, the loss rate of the electromagnet is correspondingly increased, and in the process of lifting the presser foot, the elastic force of the elastic sheet pressing plate is increased more and more, so that the load of the electromagnet is further increased; the electromagnet can only do linear reciprocating motion, and the lifting height of the presser foot can not be controlled by adjusting the stroke of the iron core of the electromagnet in real time, so that the idle stroke of the presser foot is large, and the loss is further aggravated; the pressure of the pressure foot needs to be adjusted, the compression amount of the elastic sheet pressing plate needs to be adjusted through the pressure adjusting screw, however, a screwdriver needs to be specially prepared, and the series of adjusting actions are troublesome, so that the working efficiency is affected.
Disclosure of Invention
The invention aims to provide an automatic presser foot lifting and adjusting mechanism of a sewing machine, which aims to solve the problems of large power loss and inconvenience in pressure regulation of the presser foot when the existing automatic presser foot lifting structure lifts the presser foot.
In order to achieve the purpose, the invention provides the following technical scheme: an automatic presser foot lifting and adjusting mechanism of a sewing machine comprises a stepping motor, a pressure regulating driving cam, a spring plate pressing plate, a pull rod, a roller, a swing rod, a salad center seat group, a presser bar fixing seat and a presser bar pressing foot component, wherein the pressure regulating driving cam is fixedly installed at the output end of the stepping motor, a mounting hole is formed in the back surface of the pressure regulating driving cam, the pressure regulating driving cam is fixed at the output end of the stepping motor through the mounting hole, a spiral curved surface is arranged on the front surface of the pressure regulating driving cam, an arc curved surface is arranged at the end part of the pressure regulating driving cam, a pressing plate pin is inserted at one end of the spring plate pressing plate, the spring plate pressing plate is rotatably installed in a sewing machine shell through the pressing plate pin, the other end of the spring plate pressing plate is arranged on the presser bar fixing seat, one end of the pull, the salad core holder set is rotatably installed inside a sewing machine shell through a supporting screw rod, the roller wheel is rotatably installed on the swing rod through a roller pin shaft, the swing rod is rotatably installed on a swing rod through a swing rod pin shaft, the swing rod passes through the swing rod installation support and is installed inside the sewing machine shell, the pressing rod fixing seat is fixedly connected with the salad core holder set through a bolt, and the pressing rod pressing foot assembly is inserted in the axis of the pressing rod fixing seat.
The front surface of the stepping motor is fixedly provided with a motor mounting bracket through a bolt, and the stepping motor is fixedly arranged inside a shell of the sewing machine through the motor mounting bracket.
The outer wall of the output end of the stepping motor is provided with a flat section, one side of the outer wall of the pressure regulating driving cam is provided with a mounting plane, and the mounting plane and the outer wall of the output end of the stepping motor are provided with flat section parallel arrangement.
The spiral curved surface on the front surface of the pressure regulating driving cam is in contact with the upper surface of the elastic sheet pressing plate.
The roller rotates around the roller pin shaft, and the arc-shaped curved surface at the end part of the pressure regulating driving cam and the roller are positioned on the same vertical plane.
The bar pressing and foot pressing assembly comprises a pressing foot and a pressing bar, the pressing foot is positioned at the bottom of the pressing bar, the pressing bar is inserted into the axis of the pressing bar fixing seat, and the pressing bar pressing and foot pressing assembly is fixedly connected with the pressing bar fixing seat through the pressing bar.
Compared with the prior art, the invention has the beneficial effects that:
according to the automatic pressure bar and foot lifting mechanism, the stepping motor is used as a motive power for automatically lifting the pressure foot, the stepping motor is arranged at a position close to the pressure foot, the lifting and the lowering of the pressure bar and foot lifting assembly are controlled through the pressure regulating driving cam and the elastic sheet pressing plate, the transmission mechanism is simplified, and the elastic force of the elastic sheet pressing plate is synchronously reduced when the pressure bar and foot lifting assembly is automatically lifted; the pressure of the presser foot component can be automatically adjusted, and the adjusting action is simplified.
Drawings
FIG. 1 is a schematic overall front view of the present invention;
FIG. 2 is a schematic diagram of the overall front view explosion structure of the present invention;
FIG. 3 is an enlarged view of the pressure regulating driving cam according to the present invention;
FIG. 4 is a schematic perspective view of the automatic presser foot lifting driving mechanism of the present invention;
FIG. 5 is a schematic front view of the automatic presser foot lifting driving mechanism of the present invention;
fig. 6 is a schematic structural diagram of a control method of the stepping motor according to the present invention.
In FIGS. 1-6: 10-a stepper motor; 11-a motor mounting bracket; 20-pressure regulating driving cam; 21-mounting plane; 22-mounting holes; 23-a helical curved surface; 24-an arc-shaped curved surface; 30-a spring plate pressing plate; 31-platen pin; 40-a pull rod; 41-pull rod pin; 50-a roller; 51-a roller pin; 60-oscillating bars; 61-oscillating bar pin shaft; 62-a swing rod mounting bracket; 70-salad heart base group; 71-support screws; 80-pressing rod fixing seat; 90-presser bar presser foot assembly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution: an automatic presser foot lifting and adjusting mechanism of a sewing machine comprises a stepping motor 10, a pressure regulating driving cam 20, a spring plate pressing plate 30, a pull rod 40, a roller 50, a swing rod 60, a salad center seat set 70, a pressure rod fixing seat 80 and a pressure rod presser foot component 90, wherein the pressure regulating driving cam 20 is fixedly installed at the output end of the stepping motor 10, a mounting hole 22 is formed in the back surface of the pressure regulating driving cam 20, the pressure regulating driving cam 20 passes through the mounting hole 22 to be fixed at the output end of the stepping motor 10, a spiral curved surface 23 is arranged on the front surface of the pressure regulating driving cam 20, an arc curved surface 24 is arranged at the end part of the pressure regulating driving cam 20, a pressing plate pin 31 is inserted into one end of the spring plate pressing plate 30, the spring plate pressing plate 30 passes through the pressing plate pin 31 to be rotatably installed inside the sewing machine shell, the other end of the spring plate pressing plate 30 is, the other end of the pull rod 40 is rotatably connected with the salad core holder set 70, the salad core holder set 70 is rotatably installed inside the sewing machine shell through a supporting screw rod 71, the roller 50 is rotatably installed on the swing rod 60 through a roller pin shaft 51, the swing rod 60 is rotatably installed on a swing rod mounting bracket 62 through a swing rod pin shaft 61, the swing rod 60 is installed inside the sewing machine shell through the swing rod mounting bracket 62, the pressing rod fixing seat 80 is fixedly connected with the salad core holder set 70 through a bolt, and the pressing rod pressing foot component 90 is inserted in the axis of the pressing rod fixing seat 80.
The swing rod 60 is hinged with a swing rod mounting bracket 62 through a swing rod pin shaft 61, and the swing rod mounting bracket 62 is fixed on the sewing machine shell; one end of a pull rod 40 is hinged with the swing rod 60 through a pull rod pin 41, the other end of the pull rod 40 is hinged with a salad core holder group 70, the salad core holder group 70 is hinged on the sewing machine shell through a supporting screw 71, and a hinged four-bar mechanism is formed by the swing rod 60, the pull rod 40 and the salad core holder group 70.
The front surface of the stepping motor 10 is fixedly provided with a motor mounting bracket 11 through a bolt, and the stepping motor 10 is fixedly arranged inside the shell of the sewing machine through the motor mounting bracket 11.
Wherein, step motor 10 output end outer wall is provided with the plain section, one side of pressure regulating drive cam 20 outer wall is provided with mounting plane 21, mounting plane 21 with step motor 10 output end outer wall is provided with plain section parallel arrangement.
The spiral curved surface 23 on the front surface of the pressure regulating driving cam 20 is in contact with the upper surface of the elastic sheet pressing plate 30.
The spiral curved surface 23 on the front surface of the pressure regulating driving cam 20 is pressed on the surface of the elastic sheet pressing plate 30, so that the elastic sheet pressing plate 30 is deformed to obtain the pressure of the pressure foot, and when the pressure of the pressure foot needs to be regulated, the pressure regulating driving cam 20 can be driven to rotate by the stepping motor 10, so that the deformation of the elastic sheet pressing plate 30 is regulated.
The roller 50 rotates around the roller pin 51, and the arc-shaped curved surface 24 at the end of the pressure regulating driving cam 20 and the roller 50 are located on the same vertical plane.
The roller 50 is fixed on the swing rod 60 through a roller pin 51, and the roller 50 can roll circumferentially around the roller pin 51; when the presser foot needs to be lifted, the stepping motor 10 drives the pressure regulating driving cam 20 to rotate, then the arc-shaped curved surface 24 at the end part of the pressure regulating driving cam 20 is contacted with the roller 50, the roller 50 is pushed to roll on the arc-shaped curved surface 24, so that the swing rod 60 is driven to rotate, and then the presser foot fixing seat 80 is lifted through the hinge four-bar mechanism consisting of the swing rod 60, the pull rod 40 and the salad center seat group 70, so that the presser foot assembly 90 is lifted, and the purpose of lifting the presser foot is achieved; when the presser foot is lifted, the spiral curved surface 23 on the front surface of the pressure regulating driving cam 20 reversely rotates, so that the compression amount of the elastic sheet pressing plate 30 is reduced, and the pressure of the presser foot is further reduced.
The presser bar and presser foot assembly 90 comprises a presser foot and a presser bar, the presser foot is positioned at the bottom of the presser bar, the presser bar is inserted into the axis of the presser bar fixing seat 80, and the presser bar and presser foot assembly 90 is fixedly connected with the presser bar fixing seat 80 through the presser bar.
Before lifting the presser bar presser foot assembly 90, the initial position of the pressure regulating driving cam 20 and the position of the highest point of the pressure regulating driving cam 20 are obtained, then the pre-pressing angle of the stepping motor 10 and the maximum presser foot pressure adjusting angle of the stepping motor 10 are set, when the presser foot pressure is insufficient, the presser foot pressure is adjusted by adjusting the angle of the stepping motor 10, when the presser foot pressure is sufficient, the linkage relation between the stepping motor 10 and a sewing machine spindle motor is established, the stepping motor 10 can obtain the pulse frequency and the pulse number of a sewing machine spindle motor decoder, when the stepping motor 10 obtains the spindle rotation of the sewing machine spindle motor, the stepping motor 10 drives the presser foot to lift, and when the stepping motor 10 cannot obtain the spindle rotation of the sewing machine spindle motor, the presser foot is put down.
The working principle is as follows: when in use, the roller 50 is fixed on the swing rod 60 through the roller pin shaft 51, and the roller 50 can roll circumferentially around the roller pin shaft 51; when the presser foot needs to be lifted, the stepping motor 10 drives the pressure regulating driving cam 20 to rotate, then the arc-shaped curved surface 24 at the end part of the pressure regulating driving cam 20 is contacted with the roller 50, the roller 50 is pushed to roll on the arc-shaped curved surface 24, so that the swing rod 60 is driven to rotate, and then the presser foot fixing seat 80 is lifted through the hinge four-bar mechanism consisting of the swing rod 60, the pull rod 40 and the salad center seat group 70, so that the presser foot assembly 90 is lifted, and the purpose of lifting the presser foot is achieved; when the presser foot is lifted, the spiral curved surface 23 on the front surface of the pressure regulating driving cam 20 rotates reversely, the compression amount of the elastic sheet pressing plate 30 is reduced, and further the pressure of the presser foot is reduced, so that the stepping motor 10 is used as motive power for automatically lifting the presser foot and is arranged at a position close to the presser foot, the lifting and the lowering of the pressure lifting rod presser foot component 90 are controlled through a hinge four-bar mechanism consisting of the oscillating bar 60, the pull rod 40 and the salad core seat group 70, the pressure regulating driving cam 20 and the elastic sheet pressing plate 30, the transmission mechanism is simplified, and when the pressure rod presser foot component 90 is automatically lifted, the elasticity of the elastic sheet pressing plate 30 is synchronously reduced; the pressure of the presser bar and foot assembly 90 can be automatically adjusted, simplifying the adjustment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an automatic presser foot and adjustment mechanism that lifts of sewing machine, includes step motor (10), pressure regulating drive cam (20), shell fragment clamp plate (30), pull rod (40), gyro wheel (50), pendulum rod (60), salad core seat group (70), pressure stick fixing base (80) and pressure stick presser foot subassembly (90), its characterized in that: step motor (10) output end fixed mounting has pressure regulating drive cam (20), mounting hole (22) have been seted up at pressure regulating drive cam (20) back, pressure regulating drive cam (20) pass through mounting hole (22) are fixed step motor (10) output, pressure regulating drive cam (20) openly are provided with helical surface (23), pressure regulating drive cam (20) tip is provided with curved surface (24), shell fragment clamp plate (30) one end is pegged graft and is had clamp plate pin (31), shell fragment clamp plate (30) pass through clamp plate pin (31) rotate and install inside the sewing machine shell, shell fragment clamp plate (30) other end sets up on pressure stick fixing base (80), pull rod (40) one end through pull rod pin (41) with pendulum rod (60) rotate and are connected, pull rod (40) other end with salad core seat group (70) rotate and are connected, salad core seat group (70) is rotatably installed inside a sewing machine shell through a supporting screw rod (71), a roller (50) is rotatably installed on a swing rod (60) through a roller pin shaft (51), the swing rod (60) is rotatably installed with a swing rod installing support (62) through a swing rod pin shaft (61), the swing rod (60) is installed inside the sewing machine shell through the swing rod installing support (62), a pressing rod fixing seat (80) is fixedly connected with the salad core seat group (70) through a bolt, and a pressing rod pressing foot component (90) is inserted in the axis of the pressing rod fixing seat (80).
2. The automatic presser foot lifting and adjusting mechanism of a sewing machine according to claim 1, characterized in that: the front surface of the stepping motor (10) is fixedly provided with a motor mounting bracket (11) through a bolt, and the stepping motor (10) is fixedly arranged inside a shell of the sewing machine through the motor mounting bracket (11).
3. The automatic presser foot lifting and adjusting mechanism of a sewing machine according to claim 1, characterized in that: step motor (10) output outer wall is provided with the plain section, one side of pressure regulating drive cam (20) outer wall is provided with mounting plane (21), mounting plane (21) with step motor (10) output outer wall is provided with plain section parallel arrangement.
4. The automatic presser foot lifting and adjusting mechanism of a sewing machine according to claim 1, characterized in that: the spiral curved surface (23) on the front surface of the pressure regulating driving cam (20) is in contact with the upper surface of the elastic sheet pressing plate (30).
5. The automatic presser foot lifting and adjusting mechanism of a sewing machine according to claim 1, characterized in that: the roller (50) rotates around the roller pin shaft (51), and the arc-shaped curved surface (24) at the end part of the pressure regulating driving cam (20) and the roller (50) are positioned on the same vertical plane.
6. The automatic presser foot lifting and adjusting mechanism of a sewing machine according to claim 1, characterized in that: the presser bar presser foot component (90) comprises a presser foot and a presser bar, the presser foot is positioned at the bottom of the presser bar, the presser bar is inserted into the axle center of the presser bar fixing seat (80), and the presser bar presser foot component (90) is fixedly connected with the presser bar fixing seat (80) through the presser bar.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010476552.5A CN111472106A (en) | 2020-05-29 | 2020-05-29 | Automatic presser foot lifting and adjusting mechanism of sewing machine |
| PCT/CN2020/134816 WO2021238144A1 (en) | 2020-05-29 | 2020-12-09 | Automatic presser foot lifting and adjustment mechanism of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010476552.5A CN111472106A (en) | 2020-05-29 | 2020-05-29 | Automatic presser foot lifting and adjusting mechanism of sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111472106A true CN111472106A (en) | 2020-07-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010476552.5A Pending CN111472106A (en) | 2020-05-29 | 2020-05-29 | Automatic presser foot lifting and adjusting mechanism of sewing machine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111472106A (en) |
| WO (1) | WO2021238144A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021238144A1 (en) * | 2020-05-29 | 2021-12-02 | 安徽杰羽制鞋机械科技有限公司 | Automatic presser foot lifting and adjustment mechanism of sewing machine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002159769A (en) * | 2000-11-24 | 2002-06-04 | Janome Sewing Mach Co Ltd | Sewing machine provided with presser bar pressure regulator and sewing machine provided with presser bar lifter |
| US7617786B1 (en) * | 2008-05-11 | 2009-11-17 | Hsien-Chang Tseng | Pressure adjustment structure for a presser foot of a sewing machine |
| CN104894758B (en) * | 2015-06-24 | 2017-04-19 | 杰克缝纫机股份有限公司 | Automatic sewing machine presser foot strength regulating and controlling device |
| CN108193386B (en) * | 2018-04-09 | 2023-12-15 | 浙江鸿立缝制设备有限公司 | Pressure regulating mechanism for lifting presser foot of sewing machine |
| CN111472106A (en) * | 2020-05-29 | 2020-07-31 | 安徽杰羽制鞋机械科技有限公司 | Automatic presser foot lifting and adjusting mechanism of sewing machine |
| CN212247422U (en) * | 2020-05-29 | 2020-12-29 | 安徽杰羽制鞋机械科技有限公司 | Automatic presser foot lifting and adjusting mechanism of sewing machine |
-
2020
- 2020-05-29 CN CN202010476552.5A patent/CN111472106A/en active Pending
- 2020-12-09 WO PCT/CN2020/134816 patent/WO2021238144A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021238144A1 (en) * | 2020-05-29 | 2021-12-02 | 安徽杰羽制鞋机械科技有限公司 | Automatic presser foot lifting and adjustment mechanism of sewing machine |
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| Publication number | Publication date |
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| WO2021238144A1 (en) | 2021-12-02 |
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