Presser foot driving device with stroke adjusting function and embroidery machine

Abstract

The utility model discloses a presser foot driving device with a stroke adjusting function and an embroidery machine, and relates to the embroidery machine technology, and the presser foot driving device comprises a presser foot driving mechanism and a cam lifting mechanism, the presser foot driving mechanism comprises a needle bar driver, a presser foot driver and a presser foot transmission component connected with the needle bar driver and the presser foot driver, and the needle bar driver drives the presser foot driver to ascend and descend through the presser foot transmission component; the cam lifting mechanism comprises a lifting motor, a lifting component driven by the lifting motor and a presser foot cam driven by the lifting component to lift, the presser foot cam is provided with a cam groove, the cam groove is connected with the presser foot transmission component, and the presser foot transmission component is driven to move through the cam groove when the presser foot cam lifts so as to adjust the working stroke of the presser foot. The problem that the working height adjusting range of the presser foot in the prior art is limited is solved. In addition, the motor can be controlled to operate accurately, so that the precision of adjusting the working stroke of the presser foot is high.

Description

[Technical Field]

[0001] This utility model belongs to the technical field of embroidery equipment, specifically relating to embroidery machines. [Background Technology]

[0002] In the field of embroidery machine technology, one type of presser foot drive device involves a needle bar driver that drives the presser foot driver to rise and fall via a presser foot transmission component. Adjusting the working stroke of the presser foot for different fabrics helps improve embroidery quality. Existing technology incorporates a presser foot working stroke adjustment structure to regulate the presser foot's working stroke.

[0003] Referring to Chinese invention patent application CN118854574 A, a presser foot drive mechanism is disclosed, including a presser foot lever, a drive source, a linkage assembly, and a machine head housing. A mounting shaft is provided on the machine head housing to position the presser foot lever, forming the fulcrum of the presser foot lever. An eccentric shaft portion is eccentrically mounted on the mounting shaft at the fulcrum, and a fulcrum hole mates with the eccentric shaft portion is provided on the presser foot lever. The angle of the mounting shaft can be adjusted by rotation, placing the eccentric shaft portion at different heights, thereby driving the presser foot lever, which mates with the eccentric shaft portion, to different heights. In other words, the presser foot lever's height can be adjusted by rotating the mounting shaft, thus providing a wider height adjustment range for the presser foot to adapt to different working heights.

[0004] However, in the existing technology, the working stroke of the presser foot is adjusted by rotating the eccentric shaft. Even if the eccentric shaft is rotated 360 degrees for adjustment, the range of adjustment of the working height of the presser foot is still limited. [Utility Model Content]

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a presser foot drive device and embroidery machine with stroke adjustment function, thereby solving the problem of limited adjustment range of the working height of the presser foot in existing technologies.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] First, a presser foot drive device with stroke adjustment function is provided, comprising:

[0008] The presser foot drive mechanism includes a needle bar driver, a presser foot driver, and a presser foot transmission component connecting the needle bar driver and the presser foot driver. The needle bar driver drives the presser foot driver to move up and down through the presser foot transmission component.

[0009] A cam lifting mechanism includes a lifting motor, a lifting component driven by the lifting motor, and a presser foot cam driven by the lifting component to lift. The presser foot cam is provided with a cam groove, which is connected to the presser foot transmission component. When the presser foot cam is lifted, it drives the presser foot transmission component to move through the cam groove to adjust the working stroke of the presser foot.

[0010] Preferably, the presser foot transmission component includes a presser foot drive link and a presser foot driven link. The first end of the presser foot drive link is hinged to the needle bar driver, and the second end is hinged to the first end of the presser foot driven link through a first presser foot link pin. The second end of the presser foot driven link is hinged to the presser foot driver through a second presser foot link pin. The cam groove is connected to the first presser foot link pin.

[0011] Preferably, the cam lifting mechanism further includes a lifting limit guide groove, and the second presser foot connecting pin moves up and down along the lifting limit guide groove during the operation of the presser foot.

[0012] Preferably, the lifting and limiting guide groove is provided on the pressure foot cam.

[0013] Preferably, the pressure foot cam is connected to the lifting guide block, the lifting guide block is connected to the guide structure, and the guide structure is used to guide the lifting guide block to move up and down.

[0014] Preferably, the guide structure includes a guide hole disposed in the lifting guide block and a guide rod connected to the guide hole, wherein the guide rod is arranged vertically to guide the lifting of the guide hole.

[0015] Preferably, the lifting component further includes a lifting guide seat, the lifting guide seat is provided with a guide groove, the guide groove is provided with a lateral opening and has upper and lower guide space, the guide rod is installed in the guide groove, and the upper end is connected to the top wall of the guide groove and the lower end is connected to the bottom wall of the guide groove, and the lifting guide block moves up and down along the guide rod in the upper and lower guide space of the guide groove.

[0016] Preferably, the lifting component includes an eccentric wheel with a central connecting part at one end and an eccentric shaft at the other end. The central connecting part is connected to the output shaft of the motor, and the eccentric shaft drives the pressure foot cam to lift when the eccentric wheel rotates.

[0017] Preferably, the central connecting part is provided with an expansion sleeve, which is sleeved on the output shaft of the motor and fixed to the output shaft of the motor by a clamp.

[0018] In addition, this utility model also provides an embroidery machine, including an embroidery machine head, wherein the embroidery machine head is provided with the presser foot drive device.

[0019] This utility model adopts the above technical solution and has the following technical effects:

[0020] 1. In the cam lifting mechanism, a lifting motor drives a lifting component, which in turn drives a presser foot cam to rise and fall. The presser foot cam has a cam groove, which connects to a presser foot transmission component. During lifting and lowering, the presser foot cam drives the presser foot transmission component through the cam groove to adjust the presser foot's working stroke. Because the cam curve of the cam groove extends on the plane of the presser foot cam, the cam curve can be set to be relatively long, increasing the adjustment range of the presser foot's working stroke and solving the problem of limited adjustment range of the presser foot's working height in existing technologies. Furthermore, because the motor can operate precisely under control, the accuracy of the presser foot's working stroke adjustment is also high.

[0021] 2. The presser foot transmission component includes a presser foot drive linkage and a presser foot driven linkage. The first end of the presser foot drive linkage is hinged to the needle bar driver, and the second end is hinged to the first end of the presser foot driven linkage via a first presser foot linkage pin. The second end of the presser foot driven linkage is hinged to the presser foot driver via a second presser foot linkage pin. The cam groove is connected to the first presser foot linkage pin. The needle bar driver drives the presser foot driver to move up and down along the drive shaft via the presser foot drive linkage and the presser foot driven linkage. Since the cam groove is connected to the first presser foot linkage pin, the lifting stroke of the needle bar driver is fixed. After the presser foot cam moves up and down, the relative position of the first presser foot linkage pin in the cam groove also changes, that is, it moves along the cam curve. Thus, the relative motion of the presser foot drive linkage and the presser foot driven linkage also changes, thereby realizing the adjustment of the presser foot working stroke.

[0022] 3. Furthermore, the cam lifting mechanism also includes a lifting limit guide groove. The second pressure foot connecting pin moves up and down along the lifting limit guide groove during the operation of the pressure foot. Since the second pressure foot connecting pin is connected to the pressure foot driver, the second pressure foot connecting pin can only move up and down, and the pressure foot driver can also only move up and down, thereby driving the pressure foot to move up and down. In addition, since the lifting limit guide groove is located on the pressure foot cam, the pressure foot cam can also guide the second pressure foot connecting pin.

[0023] 4. In order to guide the presser foot cam to rise and fall, the presser foot cam is connected to the lifting guide block, the lifting guide block is connected to the guide structure, and the guide structure is used to guide the lifting guide block to rise and fall. Therefore, the lifting guide block can only rise and fall.

[0024] 5. In addition, the lifting component also includes a lifting guide seat, which has a guide groove with a lateral opening and an upper and lower guide space. The guide rod is installed in the guide groove, with its top connected to the top wall of the guide groove and its bottom connected to the bottom wall of the guide groove. The lifting guide block moves up and down along the guide rod in the upper and lower guide space of the guide groove.

[0025] 6. To convert the rotation of the motor output shaft into the lifting motion of the lifting guide block, the lifting component includes an eccentric wheel with a central connecting part at one end and an eccentric shaft at the other end. The central connecting part is located at the center of the eccentric wheel, and the eccentric shaft is offset from the center of the eccentric wheel. The central connecting part is connected to the output shaft of the motor, and the eccentric shaft is connected to the lifting guide block. When the eccentric wheel rotates, the eccentric shaft drives the pressure foot cam to rise and fall. This is because the vertical position of the eccentric shaft relative to the center changes when the eccentric wheel rotates, thus allowing the lifting guide block connected to the eccentric shaft to move vertically.

[0026] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0027] The utility model will be further described below with reference to the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the structure of the embroidery machine head in this utility model;

[0029] Figure 2 This is an exploded structural diagram of the embroidery machine head in this utility model;

[0030] Figure 3 This is an exploded structural diagram of the embroidery machine head in this utility model;

[0031] Figure 4 This is an exploded structural diagram of the cam lifting mechanism in this utility model;

[0032] Figure 5 This is an exploded structural diagram of the presser foot cam and presser foot drive mechanism in this utility model;

[0033] Figure 6 This is an exploded structural diagram of the presser foot cam and presser foot drive mechanism in this utility model;

[0034] Figure 7 This is a schematic diagram of the structure of the pressure foot cam in this utility model;

[0035] Figure 8 This is a schematic diagram of the eccentric wheel in this utility model;

[0036] Figure 9 This is a schematic diagram of the guide rod structure in this utility model;

[0037] Reference numerals: 1. Cam lifting mechanism; 11. Presser foot cam; 11. Cam groove; 111. Inclined section; 1111. Vertical section; 1112. Lifting limit guide groove; 112. Presser foot cam mounting plate; 12. Lifting guide block; 13. Guide hole; 131. Guide rod; 14. Radial fastening surface; 141. Guide section; 142. Eccentric wheel; 15. Center connecting part; 151. Eccentric shaft; 152. Clamp; 16. Second rolling bearing; 17. Guide groove; 181. Fixing hole; 1 82, fixing screw 183, first rolling bearing 184, motor 19, output shaft 191, presser foot drive mechanism 2, drive shaft 21, needle bar driver 22, presser foot driver 23, presser foot drive linkage 24, presser foot driven linkage 25, first presser foot linkage pin 26, first linkage bearing 261, second presser foot linkage pin 27, second linkage bearing 271, embroidery machine head 3, head housing 31, side cover plate 32, slot 321.

Detailed Implementation Methods

[0038] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0039] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0040] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," and "lateral," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0044] like Figures 1 to 9 As shown, the embroidery machine has at least one embroidery machine head 3. The embroidery machine head 3 includes a head housing 31 and a needle bar frame located on the front side of the head housing. A transverse slide rail mechanism is provided between the needle bar frame and the head housing. In this embodiment, the relative direction between the needle bar frame and the head housing is defined as the front-back direction, and the direction of movement of the needle bar frame is defined as the transverse direction, or the left-right direction. The embroidery machine has a main shaft that extends transversely and passes through each head housing. The main shaft serves as a power source to drive the needle bars on the needle bar frame to perform reciprocating lifting and lowering movements, so that the needles at the bottom of the needle bars can embroider on the embroidery fabric. In addition, when it is necessary to change colors, the needle bar frame slides transversely along the transverse slide rail mechanism.

[0045] The needle bar holder is equipped with at least one needle bar, with an embroidery needle at the bottom. A presser foot is mounted on the needle bar. The needle bar is driven by a needle bar driver 22, and a cam linkage mechanism is provided between the needle bar driver 22 and the main shaft. Additionally, a presser foot drive device is mounted on the machine head housing 31. This presser foot drive device includes a presser foot drive mechanism 2. In this embodiment, the presser foot drive mechanism 2 includes a needle bar driver 22, a presser foot driver 23, and a presser foot transmission component connecting the needle bar driver and the presser foot driver. The needle bar driver 22 drives the presser foot driver 23 to rise and fall via the presser foot transmission component. The needle bar driver 22 and the presser foot driver 23 are mounted on a drive shaft 21, which is vertically mounted on the machine head housing 31. Both the needle bar driver 22 and the presser foot driver 23 rise and fall along the drive shaft 21. The aforementioned presser foot drive mechanism 2 is relatively common in the prior art, but typically its presser foot transmission component is connected to an eccentric shaft. The eccentric shaft rotates at a corresponding angle to adjust the presser foot's working stroke accordingly, but this has the drawback of limited adjustment range for the presser foot's working height.

[0046] To address the limited adjustment range of the presser foot's working height in existing technologies, the presser foot drive device further includes a cam lifting mechanism 1. This cam lifting mechanism 1 comprises a motor 19, a lifting component driven by the motor, and a presser foot cam 11 driven by the lifting component. Here, the presser foot cam is not a conventional cam, but rather a flat plate structure with a cam groove 111. The plane of the cam groove 111 is perpendicular to the horizontal plane. The cam groove 111 connects to the presser foot transmission component. During lifting and lowering, the presser foot cam 11 drives the presser foot transmission component to move via the cam groove 111, thereby adjusting the presser foot's working stroke. Because the cam curve of the cam groove 111 extends on the plane of the presser foot cam, the cam curve can be set to be longer, increasing the adjustment range of the presser foot's working stroke and solving the problem of limited adjustment range of the presser foot's working height in existing technologies. Furthermore, because the motor can operate with precise control, the accuracy of the presser foot's working stroke adjustment is also high.

[0047] It is understandable that the motor 19 here can be a geared motor, that is, an integration of a motor and a reducer. The reducer can be a worm gear reducer or a planetary reducer.

[0048] In some embodiments, the presser foot transmission component is a linkage component, which includes a presser foot linkage with a presser foot linkage pin as a fulcrum, and the presser foot linkage pin is connected to a cam groove. Specifically, the linkage component includes a presser foot drive linkage 24 and a presser foot driven linkage 25. The first end of the presser foot drive linkage is hinged to the needle bar driver 22, and the second end is hinged to the first end of the presser foot driven linkage via a first presser foot linkage pin 26. The second end of the presser foot driven linkage is hinged to the presser foot driver 23 via a second presser foot linkage pin 27. The cam groove 111 is connected to the first presser foot linkage pin 26. The needle bar driver 22 drives the presser foot driver 23 to move up and down along the drive shaft 21 via the presser foot drive link 24 and the presser foot driven link 25. Since the cam groove is connected to the first presser foot link pin, the lifting stroke of the needle bar driver is fixed. After the presser foot cam 11 is lifted and lowered, the relative position of the first presser foot link pin 26 in the cam groove also changes, that is, it moves along the cam curve. As a result, the hinge fulcrum position of the presser foot drive link 24 and the presser foot driven link 25 changes, and thus the relative motion of the presser foot drive link 24 and the presser foot driven link 25 also changes, thereby realizing the adjustment of the presser foot working stroke.

[0049] It is understandable that a first link bearing 261 can be provided between the first presser foot link pin 26 and the presser foot drive link 24 and the presser foot driven link 25, and a second link bearing 271 can be provided between the second presser foot link pin 27 and the presser foot driver 23.

[0050] like Figure 7As shown, the cam groove 111 has an inclined section 1111 and a vertical section 1112. The inclined section is at the bottom, and its upper end connects to the lower end of the vertical section, with the connection point being a rounded transition. The inclined section is entirely inclined, but its internal structure remains a cam curve. After the pressure foot cam 11 rises and falls, the first pressure foot connecting pin 26 mainly moves within the inclined section 1111 of the cam groove, allowing for changes in its front-to-back position and vertical height. This, in turn, changes the hinge fulcrum position of the pressure foot drive connecting rod 24 and the pressure foot driven connecting rod 25.

[0051] Furthermore, the cam lifting mechanism 1 also includes a lifting limit guide groove 112, which extends vertically. The second presser foot connecting rod pin 27 moves up and down along the lifting limit guide groove 112 during the operation of the presser foot. In this embodiment, the lifting limit guide groove 112 is located on the presser foot cam 11 and passes through the presser foot cam 11. The lifting limit guide groove 112 is below the cam groove 111, so the presser foot cam can simultaneously guide the second presser foot connecting rod pin 27. Since the second presser foot connecting rod pin 27 is connected to the presser foot driver 23, the second presser foot connecting rod pin 27 can only move up and down, and the presser foot driver 23 can also only move up and down, thereby driving the presser foot to move up and down.

[0052] To guide the lifting and lowering of the pressure foot cam, the pressure foot cam 11 is connected to the lifting guide block 13, which in turn is connected to a guide structure. This guide structure guides the lifting guide block 13 to move up and down, thus allowing it to only move up and down. In some embodiments, the guide structure includes a guide hole 131 in the lifting guide block 13 and a guide rod 14 connected to the guide hole. The guide rod has a guide section 142 in its middle, which guides and engages with the guide hole 131. It is understood that the guide structure can also be replaced with a conventional slide rail.

[0053] In some embodiments, the lifting component further includes a lifting guide seat 18, which has a guide groove 181. The guide groove 181 has a lateral opening and upper and lower guide spaces. Specifically, one side of the guide groove is closed, and the other side is open, with a top wall and a bottom wall. The guide rod 14 is installed in the guide groove, with its top connected to the top wall of the guide groove and its bottom connected to the bottom wall of the guide groove. The lifting guide block 13 moves up and down along the guide rod 14 within the upper and lower guide spaces of the guide groove. The top and bottom walls of the guide groove have fixing holes 182, and the top and bottom of the guide rod 14 have radial fastening surfaces 141. Fixing screws 183 are radially connected to the fixing holes, and the fixing screws tighten the radial fastening surfaces 141 from the radial direction to fix the guide rod 14. One side wall of the guide groove has a bearing mounting hole for installing a first rolling bearing 184 to support the motor output shaft 191.

[0054] To convert the rotation of the motor output shaft into the lifting motion of the lifting guide block, the lifting component includes an eccentric wheel 15 with a central connecting portion 151 at one end and an eccentric shaft 152 at the other end. The central connecting portion 151 is located at the center of the eccentric wheel, while the eccentric shaft 152 is offset from the center of the eccentric wheel. The central connecting portion 151 is connected to the output shaft 191 of the motor, and the eccentric shaft 152 is connected to the lifting guide block 13. The eccentric shaft 152 drives the pressure foot cam to rise and fall when the eccentric wheel rotates. This is because the vertical position of the eccentric shaft relative to the center changes when the eccentric wheel rotates, allowing the lifting guide block 13 connected to the eccentric shaft to move vertically. Of course, since the lifting guide block 13 can only move up and down under the guidance of the guide rod, the eccentric shaft 152 and the lifting guide block 13 need to move relative to each other. Specifically, the lifting guide block 13 has a horizontally extending movable groove on the side facing the eccentric wheel 15. The eccentric shaft 152 extends into the horizontal movable groove, so that the eccentric shaft 152 can move relative to each other in the horizontal movable groove, and drive the lifting guide block 13 to move up and down. In addition, a second rolling bearing 17 is installed on the eccentric shaft 152, so the second rolling bearing 17 can roll in the horizontal movable groove. The central connecting part 151 is provided with an expansion sleeve, which is sleeved on the output shaft 191 of the motor and clamped and fixed to the motor output shaft by a clamp 16.

[0055] The lifting guide seat 18 is fixed to the side cover plate 32 with screws on one side of its opening. The side cover plate 32 is fixed to the left side of the machine head housing with screws. This way, the motor 19, the lifting guide seat 18, and the lifting guide block 13 are all located outside the side cover plate of the machine head housing, without occupying the limited space inside the machine head housing. Additionally, the left side of the pressure foot cam 11 is fixed to the pressure foot cam mounting plate 12. The side cover plate 32 has a slot 321 corresponding to the position of the lifting guide block 13, through which the lifting guide block 13 passes and is fixed to the pressure foot cam mounting plate 12.

[0056] It is understood that the connecting rod involved in this embodiment refers to a rod with a similar function but whose shape is not limited to a rod-shaped structure. Bearings or bushings can be provided between the connecting rod and the connecting rod pin.

[0057] The above description is merely a specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the utility model will be included within the scope of the claims.

Claims

1. A presser foot drive device with stroke adjustment function, characterized in that, The application relates to a presser foot driving device for embroidery machines. The presser foot driving device comprises a presser foot driving mechanism, a cam lifting mechanism and a needle bar driving mechanism. The presser foot driving mechanism comprises a needle bar driver, a presser foot driver and a presser foot transmission component connecting the needle bar driver and the presser foot driver.

2. The presser foot drive of claim 1, wherein The cam lifting mechanism comprises a lifting motor, a lifting component driven by the lifting motor and a presser foot cam driven by the lifting component to lift.

3. The presser foot drive of claim 2, wherein, The presser foot transmission component comprises a presser foot driving link and a presser foot driven link.

4. The presser foot drive of claim 3, wherein The first end of the presser foot driving link is hinged to the needle bar driver, and the second end is hinged to the first end of the presser foot driven link through a first presser link pin.

5. The presser foot drive of claim 1 wherein, The second end of the presser foot driven link is hinged to the presser foot driver through a second presser link pin.

6. The presser foot drive of claim 5, wherein, The cam slot is connected with the first presser link pin.

7. The presser foot drive of claim 6, wherein, The cam lifting mechanism further comprises a lifting limiting guide slot.

8. The presser foot drive of claim 1 wherein, The lifting limiting guide slot is arranged on the presser foot cam.

9. The presser foot drive of claim 8, wherein, The presser foot cam is connected with a lifting guide block.

10. Embroidery machine comprising an embroidery machine head, characterized in that The lifting guide block is connected with a guide structure. The guide structure comprises a guide hole arranged on the lifting guide block and a guide rod connected with the guide hole. The guide rod is vertically arranged and used for guiding the lifting of the guide hole. The lifting component further comprises a lifting guide seat. The lifting guide seat is provided with a guide slot. The guide slot is provided with a lateral opening and has an upper and lower guide space. The guide rod is installed in the guide slot and connected with the top wall and the bottom wall of the guide slot. The lifting guide block lifts along the guide rod in the upper and lower guide space of the guide slot. The lifting component comprises an eccentric wheel having a central connecting portion at one end and an eccentric shaft at the other end. The central connecting portion is connected with the output shaft of the motor. The eccentric shaft drives the presser foot cam to lift when the eccentric wheel rotates. The central connecting portion is provided with an expansion sleeve. The expansion sleeve is sleeved on the output shaft of the motor and fixed with the output shaft of the motor through a clamp. The embroidery machine head is provided with the presser foot driving device.

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