Independent presser foot driving device and embroidery machine

Abstract

The utility model discloses an independent presser foot driving device and an embroidery machine, relates to the embroidery machine technology, solves the problem of limited axial space, and can lift a presser foot to a non-working height, and the independent presser foot driving device comprises a conjugate cam connecting rod mechanism and an independent presser foot lifting mechanism, wherein the conjugate cam connecting rod mechanism is used for completing the working stroke of the presser foot, the independent presser foot lifting mechanism is used for lifting the presser foot to a first height, and the first height is higher than the highest point of the working stroke of the presser foot; the conjugate cam connecting rod mechanism comprises a conjugate cam mounted on the main shaft and a conjugate connecting rod assembly driven by the conjugate cam, and the conjugate cam is provided with an inner cam surface and an outer cam surface; the conjugate connecting rod assembly is provided with a first transmission part, a second transmission part and a third transmission part, the first transmission part is matched with the inner cam surface, and the second transmission part is matched with the outer cam surface; the independent presser foot lifting mechanism comprises a presser foot lifting motor and a presser foot lifting component driven by the presser foot lifting motor.

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, the presser foot is driven in two ways: one is combined with the needle bar movement, in which the needle bar drives the presser foot to reciprocate up and down; the other is an independent presser foot, which is driven by an independent power source to reciprocate up and down. The reciprocating up and down movements of the independent presser foot and the needle bar do not interfere with each other.

[0003] Referring to Chinese invention patent application CN 117802708 A, an independent presser foot drive device is disclosed, including a main shaft, a first cam and a second cam mounted on the main shaft, an independent presser foot, a first transmission member having a first rotation fulcrum, and a presser foot drive block that can be raised and lowered. The first transmission member and the presser foot drive block are directly or indirectly movably connected. The first transmission member has a first roller and a second roller. The rolling engagement between the outer cam surface of the first roller and the first cam causes the presser foot drive block to drive the independent presser foot to complete the upward stroke, and the rolling engagement between the outer cam surfaces of the second roller and the second cam causes the presser foot drive block to drive the independent presser foot to complete the downward stroke. Because the first cam and the second cam need to be simultaneously mounted on the main shaft to complete the upward and downward strokes of the independent presser foot, the axial space of the embroidery machine head is increased.

[0004] In addition, in the existing technology, the independent presser foot drive device only raises the presser foot to the maximum height of the presser foot working stroke, which may cause interference with the embroidery fabric when changing colors or when the presser foot is not in use. [Utility Model Content]

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an independent presser foot drive device and embroidery machine. This solves the problem of increased axial space caused by the simultaneous setting of the first and second cams in existing technologies. It also allows the presser foot to be raised to a non-working height, thus avoiding the risk of the presser foot interfering with the embroidery fabric during color changes or when the presser foot is not in use.

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

[0007] First, an independent presser foot drive device is provided, including a conjugate cam linkage mechanism and an independent presser foot lifting mechanism. The conjugate cam linkage mechanism is used to complete the working stroke of the presser foot, and the independent presser foot lifting mechanism is used to lift the presser foot to a first height, which is higher than the highest point of the working stroke of the presser foot.

[0008] The conjugate cam linkage mechanism includes a conjugate cam mounted on the main shaft and a conjugate linkage assembly driven by the conjugate cam. The conjugate cam has an inner cam surface and an outer cam surface. The conjugate linkage assembly has a first transmission part, a second transmission part and a third transmission part. The first transmission part cooperates with the inner cam surface, the second transmission part cooperates with the outer cam surface, and the third transmission part is used to drive the pressure foot drive block.

[0009] The independent presser foot lifting mechanism includes a presser foot lifting motor and a presser foot lifting component driven by the presser foot lifting motor. The presser foot lifting component is provided with a lifting part that supports the presser foot driving block during the lifting process. The lifting part has an avoidance state that moves away from the presser foot driving block during the presser foot's operation.

[0010] Preferably, the conjugate link assembly further includes a conjugate link, which is rotatably connected to a first conjugate link pin, the first conjugate link pin being located below the main shaft, and the first transmission part and the second transmission part being located on the conjugate link.

[0011] Preferably, the conjugate link is fixed together by conjugate link A and conjugate link B, the first transmission part is provided on conjugate link A, the second transmission part is provided on conjugate link B, conjugate link A is provided with an inner sleeve that is sleeved on the conjugate link pin, and conjugate link B is provided with an adjusting clamp that is tightly fixed by the inner sleeve.

[0012] Preferably, the conjugate link assembly further includes a presser foot drive link rotatably connected to the second conjugate link pin, and the third transmission part is disposed at the second end of the presser foot drive link.

[0013] Preferably, the third transmission unit is located below the presser foot drive block. When the presser foot drive linkage is raised, it drives the presser foot drive block to rise. When the presser foot drive linkage is lowered, the presser foot descends under the action of the presser foot spring.

[0014] Preferably, the conjugate link assembly further includes an intermediate link, the two ends of which are respectively connected to the first ends of the conjugate link and the pressure foot drive link.

[0015] Preferably, the presser foot lifting component includes a presser foot lifting linkage and a guide member, wherein the presser foot lifting linkage moves along the guide member.

[0016] Preferably, the presser foot lifting link includes a first presser foot lifting link and a second presser foot lifting link, the lifting part is provided at the first end of the first presser foot lifting link, the second end of the first presser foot lifting link is hinged to the first end of the second presser foot lifting link, and the first presser foot lifting link is provided with a guide part that cooperates with the guide member.

[0017] Preferably, the guide member is provided with a guide groove extending vertically, and the guide portion rises and falls along the guide groove; and / or, the guide portion is provided with guide rollers.

[0018] In addition, this utility model also provides an embroidery machine, including the aforementioned independent presser foot drive device.

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

[0020] This invention employs a conjugate cam-linkage mechanism, including a conjugate cam mounted on the main shaft and a conjugate link assembly driven by the conjugate cam. The conjugate link assembly has a first transmission part, a second transmission part, and a third transmission part. The outer cam surface engages with the second transmission part, causing the pressure foot drive block to drive the independent pressure foot to complete the upward stroke; the inner cam surface engages with the first transmission part, causing the pressure foot drive block to drive the independent pressure foot to complete the downward stroke. Compared with existing technologies, only one conjugate cam is needed, solving the problem of increased axial space caused by simultaneously using a first and a second cam in existing technologies.

[0021] In addition to the existing independent presser foot drive device, an independent presser foot lifting mechanism is set up. The independent presser foot lifting mechanism includes a presser foot lifting motor and a presser foot lifting component driven by the presser foot lifting motor. The presser foot lifting component is provided with a lifting part that supports the presser foot under the presser foot drive block during the lifting process, so as to lift the presser foot to a position higher than the highest point of the presser foot's working stroke, so as to avoid the risk of the presser foot interfering with the embroidery fabric when changing colors or when the presser foot is not working. The lifting part has an avoidance state that moves away from the presser foot drive block during the presser foot's working process, so as not to affect the normal operation of the presser foot.

[0022] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0023] The utility model will be further described below with reference to the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the head structure of the embroidery machine in this utility model;

[0025] Figure 2 This is a side view of the head of the embroidery machine in this utility model (the head housing is not shown);

[0026] Figure 3 This is a schematic diagram of the conjugate cam linkage mechanism of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the independent presser foot lifting mechanism in this utility model, showing the independent presser foot being lifted to the first height.

[0028] Figure 5 This is a schematic diagram of the structure of the independent presser foot lifting mechanism in this utility model, showing the independent presser foot being lifted to the first height.

[0029] Figure 6 This is a schematic diagram of the structure of the independent presser foot lifting mechanism in this utility model, showing the independent presser foot being lifted to the first height.

[0030] Figure 7 This is a schematic diagram of the structure of the independent presser foot lifting mechanism in this utility model, showing the independent presser foot being lifted to the first height.

[0031] Figure 8 yes Figure 7 Schematic diagram of a local structure in the middle;

[0032] Figure 9 This is a schematic diagram showing the relative relationship between the independent presser foot lifting mechanism and the conjugate cam linkage mechanism in the independent presser foot lifting mechanism at the first height state in this utility model.

[0033] Figure 10 This is a schematic diagram of the independent presser foot lifting mechanism and the independent presser foot in the non-functional state of this utility model;

[0034] Figure 11 yes Figure 10 Schematic diagram of a local structure in the middle;

[0035] Figure 12 This is a schematic diagram showing the relative relationship between the independent presser foot lifting mechanism and the conjugate cam linkage mechanism in the independent presser foot inactive state of this utility model.

[0036] Figure 13 This is a schematic diagram showing the relative relationship between the independent presser foot lifting mechanism and the conjugate cam linkage mechanism in the independent presser foot inactive state of this utility model.

[0037] Figure 14 This is a schematic diagram of the independent pressure foot clutch mechanism in this utility model;

[0038] Figure 15 This is a schematic diagram of the independent pressure foot clutch mechanism in this utility model;

[0039] Reference numerals: 1. Conjugate cam linkage mechanism; 11. Conjugate cam; 11. Inner cam surface; 111. Outer cam surface; 112. Conjugate link; B12. First roller; 121. Conjugate link; A13. Second roller; 131. Inner sleeve; 132. First conjugate link pin; 14. Intermediate link; 15. Presser foot drive link; 16. Third roller; 161. Independent presser foot lifting mechanism 2. First presser foot lifting link; 21. Lifting part; 211. Guide roller; 212. Hinge groove; 213. Second presser foot lifting link; 22. Linkage part; 221. Transmission sleeve; 222. Transmission boss; 223. Limiting groove; 224. Limiting pin; 225. Guide member; 23. Guide groove; 231. Rotating shaft; 24. First... Shaft end 241, second shaft end 242, second conjugate connecting rod pin 243, driven pulley 25, end plate 251, annular groove 252, transmission pin 253, fixing screw 254, presser foot lifting motor 26, independent presser foot clutch mechanism 3, presser foot clutch plate 31, vertical section 311, oblique section 312, anti-rotation part 313, locking part 314, side recess 315, clutch pin 32, machine head housing 4, needle bar frame 5, needle bar 51, embroidery needle 511, presser foot 52, presser foot body 521, presser foot drive block 53, presser foot drive part 531, presser foot positioning block 532, presser foot spring 54, needle bar lower stop point 55, top pin 551, transverse slide rail mechanism 6, needle bar drive device 7.

Detailed Implementation Methods

[0040] 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.

[0041] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] like Figures 1 to 15 As shown, the embroidery machine has at least one machine head, which includes a machine head housing 4 and a needle bar frame 5 located on the front side of the machine head housing. A transverse slide rail mechanism 6 is provided between the needle bar frame 5 and the machine head housing 4. In this embodiment, the relative direction between the needle bar frame 5 and the machine head housing 4 is defined as the front-back direction, and the direction of movement of the needle bar frame 5 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 machine head housing. The main shaft serves as a power source to drive the needle bars 51 mounted on the needle bar frame to perform reciprocating lifting and lowering movements, so that the embroidery 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 5 slides transversely along the transverse slide rail mechanism 6. During this process, the needle bars and presser feet that were originally performing embroidery need to be raised and removed from the embroidery fabric by a certain height.

[0047] The needle bar holder 5 is equipped with a needle bar 51, which has a lower stop point 55. A needle 511 is located at the bottom of the needle bar 51. A presser foot 52 is mounted on the needle bar 51, and a presser foot body 521 is located at the bottom of the presser foot 52. The presser foot is connected to a presser foot drive block 53 and a presser foot spring 54. The presser foot drive block 53 is movably connected to the needle bar 51. When the presser foot is raised by the presser foot drive block 53, it presses the presser foot spring 54 upwards. When the presser foot drive block 53 is lowered, the presser foot spring 54 returns to its original position. Additionally, the machine head includes a needle bar drive device 7 for driving the needle bar, and an independent presser foot drive device for driving the presser foot 52.

[0048] like Figure 3 As shown, in this embodiment, the independent presser foot drive device is equipped with a conjugate cam linkage mechanism 1. The conjugate cam linkage mechanism 1 includes a conjugate cam 11 mounted on the main shaft and a conjugate linkage assembly driven by the conjugate cam. The conjugate cam 11 has an inner cam surface 111 and an outer cam surface 112. The conjugate linkage assembly has a first transmission part, a second transmission part, and a third transmission part. The first transmission part engages with the inner cam surface, and the second transmission part engages with the outer cam surface. Furthermore, the first and second transmission parts always act on the inner and outer cam surfaces of the conjugate cam, thereby maintaining the relative position of the conjugate linkage assembly. Additionally, the third transmission part is used to drive the presser foot drive block to rise and fall.

[0049] The conjugate link assembly includes a conjugate link, which is rotatably connected to a first conjugate link pin 14. The first conjugate link pin 14 is located below the main shaft. The first transmission part and the second transmission part are located on the conjugate link. The first conjugate link pin 14 is installed on the head housing 4.

[0050] The aforementioned conjugate cam linkage mechanism has an outer cam surface that engages with the second transmission unit, enabling the presser foot drive block to drive the independent presser foot to complete the upward stroke; and an inner cam surface that engages with the first transmission unit, enabling the presser foot drive block to drive the independent presser foot to complete the downward stroke, or vice versa. Compared with the prior art, only one conjugate cam is needed, solving the problem of increased axial space caused by the simultaneous setting of the first cam and the second cam in the prior art.

[0051] Specifically, the conjugate link assembly includes conjugate link A13 and conjugate link B12. Conjugate link A13 has an inner sleeve 132 that fits over the first conjugate link pin 14. Conjugate link B12 is clamped and fixed to the inner sleeve 132 by a clamp, forming a single unit. A bearing is provided between the inner sleeve 132 and the first conjugate link pin 14. The reason for separating conjugate link A13 and conjugate link B12 and connecting them by a clamp is that the relative positional relationship between conjugate link A13 and conjugate link B12 and other components of the conjugate cam link mechanism needs to be maintained. Even after conjugate link A13 and conjugate link B12 are assembled with related components, the clamp bolts can still be loosened to adjust the relative position between conjugate link A13 and conjugate link B12, thereby ensuring the relative positional relationship between conjugate link A13 and conjugate link B12 and other components of the conjugate cam link mechanism.

[0052] To reduce wear and impact during transmission, the first transmission part is provided with a first roller 121, and the second transmission part is provided with a second roller 131. The first roller 121 is located on the conjugate connecting rod B12 and is secured to the first roller shaft using a clamp. A bearing can be installed between the first roller body and the first roller shaft. The second roller 131 is located on the conjugate connecting rod A13 and is secured to the second roller shaft using a clamp. A bearing can be installed between the second roller body and the second roller shaft.

[0053] Furthermore, the conjugate linkage assembly also includes a pressure foot drive linkage 16 rotatably connected to the second conjugate linkage pin, and the third transmission part is located at the second end of the pressure foot drive linkage.

[0054] In this embodiment, the third transmission unit is located below the presser foot drive block 53, and the third transmission unit is provided with a third roller 161. The presser foot drive block 53 is provided with a presser foot drive part 531 protruding above the third roller 161, and the bottom surface of the presser foot drive part 531 cooperates with the third roller 161. When the third roller 161 on the presser foot drive linkage 16 is raised, it drives the presser foot drive block 53 to rise. When the third roller 161 on the presser foot drive linkage 16 is lowered, since the presser foot drive linkage 16 no longer interacts with the presser foot drive block 53, the presser foot can descend under the action of the presser foot spring 54. That is, the rising of the presser foot relies on the action of the conjugate linkage mechanism, but the falling of the presser foot mainly relies on the action of the presser foot spring. Of course, the presser foot drive linkage 16 can be connected to a return torsion spring to ensure better return.

[0055] Furthermore, the conjugate link assembly also includes an intermediate link 15, the two ends of which are respectively connected to the first end of the conjugate link A13 and the pressure foot drive link 16.

[0056] In this embodiment, the conjugate link A13 is provided with a triangular link frame, meaning the lateral projection of the link frame is triangular. The lateral projections of the first transmission part, the first conjugate link pin, and the connection point with the intermediate link are respectively located at the three corners of the lateral projection triangle of the link frame. In this way, within a limited space, the first transmission part, the first conjugate link pin, and the connection point with the intermediate link are staggered, preventing interference between them. Furthermore, in the horizontal projection, the conjugate link B12, the intermediate link 15, and the pressure foot drive link 16 are all located on the same side of the conjugate link A13, i.e., on the same lateral side, forming a compact layout in the lateral space and avoiding an increase in axial space.

[0057] In some embodiments, the presser foot drive link 16 is a V-shaped link with a first side and a second side, and the fulcrum connecting to the second conjugate link pin is located at the junction of the first and second sides. Preferably, the first side is shorter than the second side, wherein the first side is connected to the intermediate link 15, and the third transmission part is located on the second side. Since the presser foot drive link 16 rotates perpendicular to the horizontal plane, designing it as a V-shaped link can save space in the front-rear direction.

[0058] The presser foot's working stroke refers to the reciprocating motion of the presser foot between its lowest and highest working strokes during embroidery. The lowest working stroke is when the presser foot is pressed against the fabric, holding it in place so the needle can move and embroider. At the highest working stroke, the presser foot is lifted off the fabric, allowing the fabric to move with the embroidery frame in preparation for subsequent embroidery work.

[0059] In existing technology, the independent presser foot drive device only raises the presser foot to the maximum height of the presser foot's working stroke. This poses a risk of interfering with the embroidery fabric during color changes and when the presser foot is not in use. Therefore, the presser foot can be raised to a height higher than the presser foot's working stroke, i.e., higher than the maximum height of the presser foot's working stroke. This can be defined as the first height, i.e., the non-working height.

[0060] like Figures 4 to 13 As shown, in order to raise the presser foot to a non-working height, an independent presser foot lifting mechanism 2 is also provided, which is used to raise the presser foot to a first height, which is higher than the highest point of the presser foot's working stroke. Here, "independent lifting" means that an independent presser foot lifting mechanism is set up completely independently, separate from the existing independent presser foot drive device in the prior art.

[0061] In this embodiment, the independent presser foot lifting mechanism 2 includes a presser foot lifting motor 26 and a presser foot lifting component driven by the presser foot lifting motor 26. The presser foot lifting component has a lifting part 211 that supports the presser foot driving block 53 during the lifting process. The lifting part 211 has a clearance state where it moves away from the presser foot driving block during the presser foot's operation. At this time, the independent presser foot lifting mechanism 2 is not activated, and the presser foot is driven by the conjugate cam linkage mechanism 1. The lifting part 211 is not directly connected to the presser foot driving block, but is movably supported below the presser foot driving block. In this way, it directly interacts with the presser foot driving block during lifting, and can disengage from the presser foot driving block and avoid the area below the presser foot driving block when not lifting.

[0062] Similar to the third roller 161, the lifting part 211 also interacts with the bottom surface of the presser foot drive part 531. It is understandable that, since both the lifting part 211 and the third roller 161 are located below the presser foot drive block and both move up and down, to avoid mutual interference and to achieve the independent function of the independent presser foot lifting mechanism 2, the lifting part 211 and the third roller 161 are offset laterally. The lifting part 211 can also be equipped with a lifting roller; in this case, the lifting part has an arc-shaped surface that interacts with the bottom surface of the presser foot drive part 531.

[0063] In some embodiments, the presser foot lifting component includes a presser foot lifting link and a guide member 23, the presser foot lifting link moving along the guide member. Specifically, the presser foot lifting link includes a first presser foot lifting link 21 and a second presser foot lifting link 22, a lifting part 211 is provided at the first end of the first presser foot lifting link, the second end of the first presser foot lifting link 21 is hinged to the first end of the second presser foot lifting link 22, the first presser foot lifting link 21 is provided with a guide part that guides and cooperates with the guide member 23, and the presser foot lifting motor 26 drives the second presser foot lifting link 22 to rotate. Specifically, the guide member 23 is provided with a vertically extending guide groove 231, the guide part rising and falling along the guide groove. Preferably, the guide part is provided with a guide roller 212, the guide roller 212 rollingly cooperating with the guide groove 231. In this way, when the second presser foot lifting link 22 rotates, the first presser foot lifting link 21 and the second presser foot lifting link 22 can also rotate relative to each other. At the same time, the drive guide roller 212 rises and falls in the guide groove 231.

[0064] Specifically, the second end of the first presser foot lifting link 21 is provided with a hinge groove 213. The hinge groove 213 has a U-shaped structure, and a pin connects the two side walls. The first end of the second presser foot lifting link 22 is hinged to the hinge groove by the pin. The lateral projections of the lifting part 211, the guide part (guide roller 212), and the hinge groove 213 are respectively located at the three vertices of a triangle, and the lifting part and the guide part are correspondingly arranged on both sides of the hinge groove. The lifting part extends obliquely upwards towards the lower part of the presser foot drive block, and the guide part also extends obliquely upwards, but in the opposite direction to the oblique extension of the lifting part, forming an acute angle between them. This also ensures that the guide part and the lifting part avoid each other in the front-back direction, allowing the guide roller 212 to rise and fall along the guide groove. The lifting part and the guide part are correspondingly arranged on both sides of the hinge groove to avoid interference between them in the lateral space.

[0065] Specifically, the second presser foot lifting link 22 has a link portion 221, which is hinged to the first presser foot lifting link 21. The second end of the second presser foot lifting link 22 has a transmission sleeve 222, which is axially and perpendicularly connected to the second end of the link portion 221. The transmission sleeve 222 extends to one side of the second end of the link portion 221, i.e., the side where the guide is located, thus leaving space on the other side for the aforementioned conjugate link assembly. The transmission sleeve 222 is rotatably supported on the rotating shaft 24. A transmission assembly is provided between the transmission sleeve 222 and the presser foot lifting motor 26, so that the presser foot lifting motor can drive the transmission sleeve to rotate via the transmission assembly, thereby realizing the rotation of the second presser foot lifting link. The transmission assembly includes a rotating element that drives the transmission sleeve to rotate. For example, the rotating element can be a gear, sprocket, etc. In this embodiment, a pulley is selected, connected to the presser foot lifting motor 26 via a synchronous belt. This allows the presser foot lifting motor 26 to be located at the rear of the machine head, without occupying space in the machine head area.

[0066] In addition, a return torsion spring is provided between the transmission sleeve 222 and the rotating shaft 24 to realize the return of the second pressure foot lifting link 22.

[0067] In this embodiment, a synchronous belt assembly is provided between the presser foot lifting motor 26 and the presser foot lifting component. The synchronous belt assembly includes a driving pulley connected to the output shaft of the presser foot lifting motor 26, a driven pulley 25 connected to the rotating shaft 24, and a synchronous belt connecting the driving pulley and the driven pulley. It is understood that the synchronous belt assembly can also be replaced by a gear transmission assembly or a chain transmission assembly, etc., so the aforementioned rotating element can be a gear, sprocket, etc.

[0068] As described below, the driven pulley has a dual function: in addition to driving the second presser foot lifting linkage 22, it also needs to drive the rotating shaft 24 to adjust the presser foot's working stroke. This solves the problem of sharing the drive components between the independent presser foot lifting mechanism and the independent presser foot working stroke adjustment structure. However, when the rotating shaft 24 rotates to adjust the presser foot's working stroke, it is necessary to prevent the independent presser foot lifting mechanism from also operating. Therefore, to avoid the transmission sleeve 222 rotating when the driven pulley 25 drives the rotating shaft 24, a one-way transmission structure between the driven pulley 25 and the transmission sleeve 222 is specially designed. The driven pulley 25 has a first rotation angle and a second rotation angle. Within the first rotation angle, the driven pulley 25 drives the transmission sleeve 222 to rotate through the one-way transmission structure, and the transmission sleeve drives the presser foot lifting linkage to rotate. Within the second rotation angle, the driven pulley 25 drives the rotating shaft 24 to rotate, and the rotating shaft drives the second conjugate connecting rod pin to rotate to adjust the presser foot's working stroke. At this time, the one-way transmission structure does not perform transmission.

[0069] The unidirectional transmission structure includes a transmission boss 223 located at the first axial end of the transmission sleeve and a transmission component located at the second end of the driven pulley. The transmission boss 223 protrudes from a partially arc-shaped position at the first axial end of the transmission sleeve towards the first axial side. The transmission component can be a transmission pin 253. The transmission pin 253 and the transmission boss 223 correspond axially to each other on the shaft, so that the driven pulley drives the transmission sleeve to rotate within a first rotation angle through the cooperation of the transmission pin and the transmission boss. The first end of the driven pulley is closed by an end plate 251, and the second end has an annular groove 252 around the shaft. The transmission pin 253 is located in the annular groove 252. The end plate 251 has a fixing hole at a radial offset position from the shaft, and the end of the transmission pin 253 can be fixed to the fixing hole by an interference fit. In addition, the transmission boss 223 also extends into the annular groove 252.

[0070] Therefore, within its first rotation angle, the driven pulley 25, with the transmission pin 253 interacting with the transmission boss 223, drives the transmission sleeve 222 to rotate, ultimately lifting the lifting part 211. Within its second rotation angle, the transmission pin is located at a rotation angle that avoids the transmission boss, and the transmission pin and transmission boss do not interact. Therefore, when adjusting the presser foot's working stroke, the independent presser foot lifting mechanism does not work, and the driven pulley 25 can rotate clockwise or counterclockwise. This angle is used to adjust the presser foot's working stroke, which can either increase or decrease the presser foot's working stroke.

[0071] It is understandable that the terms "first rotation angle" and "second rotation angle" in the context of the driven pulley 25 are merely to distinguish their respective functions. Furthermore, although the driven pulley also drives the shaft to rotate at its first rotation angle, the conjugate cam linkage 1 is not working at this time, so its influence on the conjugate cam linkage 1 can be ignored. It is sufficient to adjust the pressure foot's working stroke to the correct position before the conjugate cam linkage 1 resumes operation.

[0072] The reason for combining the conjugate linkage mechanism 1 with the independent presser foot lifting mechanism 2 and the independent presser foot stroke adjustment structure is mainly due to the limited internal space of the machine head. In this embodiment, the independent presser foot lifting mechanism 2 and the independent presser foot stroke adjustment structure share the same drive source, namely the presser foot lifting motor 26 and the driven pulley 25; in addition, the conjugate linkage mechanism 1, the independent presser foot lifting mechanism 2, and the independent presser foot stroke adjustment structure share the same rotating shaft 24, and the segmented design of corresponding functions can reduce the number of parts, save space, and of course, reduce costs.

[0073] In existing technologies, independent presser feet driven by a main shaft have a fixed rotation angle, making it impossible to adjust the working stroke of the presser foot. This results in poor adaptability to embroidery of different thicknesses, affecting the quality of the embroidery. Therefore, some embodiments also include an independent presser foot working stroke adjustment structure to adjust the working stroke of the presser foot. Specifically, the aforementioned second conjugate connecting pin 243 is not independently set but integrated with the rotating shaft 24, specifically located at an eccentric position on the rotating shaft 24. The rotating shaft 24 drives the second conjugate connecting pin 243 to rotate, and the eccentric angle of the second conjugate connecting pin (the relative position of the eccentric part in the circumferential direction of the rotating shaft) adjusts the fulcrum position of the presser foot drive connecting rod 16, thereby adjusting the working stroke of the presser foot. After adjustment, the presser foot lifting motor 26 stops working, and the second conjugate connecting pin 243 maintains the adjusted eccentric angle. During the rotation of the second conjugate connecting pin, although the intermediate connecting rod 15 also rotates slightly, the entire conjugate cam connecting rod mechanism 1 does not work, and the conjugate connecting rod does not move.

[0074] Since the rotating shaft functions simultaneously in the independent presser foot lifting mechanism 2 and the independent presser foot stroke adjustment structure, a special design was made for the rotating shaft structure. Specifically, the rotating shaft 24 has a first shaft end 241 and a second shaft end 242 at its two ends. The first end of the driven pulley has an end plate 251 with a central insertion hole. The first shaft end 241 is inserted into the insertion hole. The end plate 251 is connected to a fixing screw 254 that secures the first shaft end, thereby locking the driven pulley to the rotating shaft. The fixing screw 254 can be an internal hex screw or have a handle for easy tightening. Alternatively, other methods can be used for fixing. With the first shaft end fixed to the driven pulley, the driven pulley can drive the rotating shaft to rotate synchronously. The axial projections of the center points of the first shaft end 241 and the second shaft end 242 coincide, but the axial projection of the center point of the second conjugate connecting rod pin is offset from the axial projections of the center points of the first shaft end 241 and the second shaft end 242, i.e., eccentrically positioned. In addition, the second shaft end 242 is rotatably supported by a fulcrum, which is located on the head housing 4.

[0075] Furthermore, the rotating shaft 24 has a fulcrum section between the first shaft end 241 and the second conjugate connecting rod pin 243, and the diameter of the fulcrum section is larger than that of the first shaft end 241 and the second conjugate connecting rod pin 243. The transmission sleeve 222 is connected to the fulcrum section, and a bearing or bushing can be installed between the two to achieve smooth rotation and reduce noise and wear.

[0076] It is understandable that when the independent presser foot is adjusted in its working stroke, the independent presser foot will not be raised simultaneously. In addition, the transmission sleeve is provided with a circumferential limiting groove 224 along a local circumferential direction, and the rotating shaft is connected to a limiting pin 225 at the corresponding axial position. The limiting pin 225 is in a limiting engagement with the circumferential limiting groove 224.

[0077] Preferably, a bearing or bushing is provided between the second conjugate connecting rod pin 243 and the pin hole of the pressure foot drive connecting rod to achieve smooth rotation and reduce noise and wear. Furthermore, the outer circular surface of the second conjugate connecting rod pin may also be provided with a lubrication groove and lubricating grease may be added.

[0078] The independent presser foot lifting mechanism 2 lifts the presser foot to the first height, with the presser foot lifting motor 26 serving as the drive source and also playing other roles. Therefore, Figures 4 to 15 As shown, in some embodiments, in order to keep the presser foot at a non-working height, an independent presser foot clutch mechanism 3 is also provided. After the independent presser foot lifting mechanism 2 lifts the presser foot to the first height, the independent presser foot clutch mechanism 3 can lock the presser foot. In this way, the presser foot lifting motor can stop working, and it can also play other roles, such as adjusting the working stroke of the presser foot.

[0079] The independent presser foot clutch mechanism 3 includes a presser foot positioning block 532 connected to the presser foot and moving synchronously with it, and a presser foot clutch plate 31 that can move relative to the presser foot positioning block when driven. The presser foot clutch plate 31 has a first position corresponding to the working state of the presser foot and a second position corresponding to the non-working state of the presser foot. The presser foot clutch plate 31 has a locking part 314, which locks with the presser foot positioning block 532 when the presser foot clutch plate 31 is in the second position and unlocks from the presser foot positioning block 532 when the presser foot clutch plate 31 is in the first position. The presser foot positioning block 532 is separately connected and fixed or integrally set with the presser foot drive block 53, and protrudes forward to facilitate cooperation with the locking part 314.

[0080] Specifically, the presser foot clutch plate 31 is rotatably mounted on the needle bar holder 5 via the clutch pin 32, and the presser foot clutch plate 31 is driven to rotate by the clutch drive component. The presser foot clutch plate 31 can rotate relative to the clutch pin 32 to achieve locking and unlocking with the presser foot positioning block. The presser foot clutch plate has a first angle corresponding to the working state of the presser foot (i.e., the first position mentioned above), and a second angle corresponding to the height of the non-working state of the presser foot (i.e., the second position mentioned above). When the clutch plate of the locking part 314 is at the second angle, it unlocks from the presser foot positioning block 532; when the presser foot clutch plate is at the first angle, it unlocks from the presser foot positioning block.

[0081] The clutch drive component includes a clutch spring (not shown in the figure). This clutch spring causes the pressure foot clutch plate to tend to rotate from a second angle to a first angle. That is, without any external force obstructing it, the clutch spring will cause the pressure foot clutch plate to rotate to the first angle, unlocking it from the pressure foot positioning block. Specifically, the clutch spring is a clutch torsion spring, which is mounted on the clutch pin and connected to the pressure foot clutch plate.

[0082] Furthermore, the clutch drive component also includes a needle bar lower stop 55, and the presser foot clutch plate 31 has an anti-rotation part 313. The needle bar lower stop 55 cooperates with the anti-rotation part 313 to position the presser foot clutch plate at the second angle. Specifically, the needle bar lower stop 55 is provided with a top pin 551. When the top pin 551 rises, it cooperates with the anti-rotation part 313 to push the presser foot clutch plate 31 to rotate to the second angle, ultimately causing the presser foot clutch plate 31 to rotate to the second angle, thereby locking the locking part 314 with the presser foot positioning block 532. That is, the locking part and the presser foot positioning block are locked by means of the rising of the needle bar.

[0083] Specifically, the presser foot clutch plate 31 includes a vertical section 311 and an inclined section 312 extending obliquely upward from the top of the vertical section to one side, the inclined section being connected to the clutch pin 32. The bottom end of the inclined section extends to the other side of the vertical section, forming an anti-rotation portion 313. A side recess 315 is provided on the lower side of the vertical section, and the locking portion 314 is located on the bottom side of the side recess. This design of the presser foot clutch plate 31 aims to minimize lateral space occupation. Because the distance between two adjacent needle bars is small, taking the design of the inclined section 312 as an example, it forms an anti-rotation portion 313, and simultaneously, for two adjacent presser foot clutch plates 31, the top of the inclined section of one extends above the bottom of the other inclined section.

[0084] In this way, when the presser foot is not in operation, the top pin 551 pushes upward against the anti-rotation part 313, keeping the presser foot clutch plate in a nearly vertical state (second angle). At the same time, the presser foot positioning block 532 is locked by the locking part 314 and cannot descend. When the presser foot is in operation, the presser foot clutch plate 31 deflects at a certain angle under the action of the clutch spring, to the first angle, thereby disengaging the locking part 314 from the presser foot positioning block 532, and the presser foot can work normally.

[0085] 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.

[0086] 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. An independent presser foot drive device, characterized in that, The device includes a conjugate cam linkage mechanism and an independent presser foot lifting mechanism. The conjugate cam linkage mechanism completes the working stroke of the presser foot, and the independent presser foot lifting mechanism lifts the presser foot to a first height, which is higher than the highest point of the presser foot's working stroke. The conjugate cam linkage mechanism includes a conjugate cam mounted on the spindle and a conjugate linkage assembly driven by the conjugate cam. The conjugate cam has an inner cam surface and an outer cam surface. The conjugate linkage assembly has a first transmission part, a second transmission part, and a third transmission part. The first transmission part cooperates with the inner cam surface, the second transmission part cooperates with the outer cam surface, and the third transmission part drives the presser foot drive block. The independent presser foot lifting mechanism includes a presser foot lifting motor and a presser foot lifting component driven by the presser foot lifting motor. The presser foot lifting component is provided with a lifting part that supports the presser foot driving block during the lifting process. The lifting part has an avoidance state that moves away from the presser foot driving block during the presser foot's operation.

2. The independent presser foot drive device according to claim 1, characterized in that, The conjugate link assembly further includes a conjugate link, which is rotatably connected to a first conjugate link pin. The first conjugate link pin is located below the main shaft, and the first transmission part and the second transmission part are located on the conjugate link.

3. The independent presser foot drive device according to claim 2, characterized in that, The conjugate link is fixed together by conjugate link A and conjugate link B. The first transmission part is provided on conjugate link A and the second transmission part is provided on conjugate link B. Conjugate link A is provided with an inner sleeve that is sleeved on the conjugate link pin. Conjugate link B is provided with an adjusting clamp that is tightly fixed by the inner sleeve.

4. The independent presser foot drive device according to claim 2, characterized in that, The conjugate link assembly also includes a presser foot drive link rotatably connected to the second conjugate link pin, and the third transmission part is located at the second end of the presser foot drive link.

5. The independent presser foot drive device according to claim 4, characterized in that, The third transmission unit is located below the presser foot drive block. When the presser foot drive linkage is raised, it drives the presser foot drive block to rise. When the presser foot drive linkage is lowered, the presser foot descends under the action of the presser foot spring.

6. The independent presser foot drive device according to claim 4, characterized in that, The conjugate link assembly also includes an intermediate link, the two ends of which are respectively connected to the first ends of the conjugate link and the pressure foot drive link.

7. The independent presser foot drive device according to claim 1, characterized in that, The presser foot lifting component includes a presser foot lifting linkage and a guide member, and the presser foot lifting linkage moves along the guide member.

8. The independent presser foot drive device according to claim 7, characterized in that, The presser foot lifting link includes a first presser foot lifting link and a second presser foot lifting link. The lifting part is provided at the first end of the first presser foot lifting link. The second end of the first presser foot lifting link is hinged to the first end of the second presser foot lifting link. The first presser foot lifting link is provided with a guide part that cooperates with the guide member.

9. The independent presser foot drive device according to claim 8, characterized in that, The guide member is provided with a guide groove extending vertically, and the guide part rises and falls along the guide groove; and / or, the guide part is provided with a guide roller.

10. An embroidery machine, characterized in that, Includes the independent presser foot drive device as described in any one of claims 1 to 9.

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