Conjugate cam connecting rod mechanism and embroidery machine

Abstract

The utility model discloses a conjugate cam connecting rod mechanism and an embroidery machine, and relates to the technical field of embroidery machines, the conjugate cam connecting rod mechanism comprises a conjugate cam installed on a 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, the second transmission part is matched with the outer cam surface, and the third transmission part is used for driving the presser foot driving block to ascend and descend. Compared with the prior art, the conjugate cam connecting rod mechanism only needs to be provided with one conjugate cam, and the problem that the axial space is increased due to the fact that a first cam and a second cam are arranged at the same time in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to embroidery equipment technical field, concretely relates to embroidery machine. BACKGROUND

[0002] In the embroidery machine technical field, the drive of the presser foot is divided into two kinds, one is combined with the needle bar movement, the needle bar drives the presser foot to reciprocatingly lift, the other is independent presser foot, the independent presser foot is driven by independent power source to reciprocatingly lift, and the reciprocating lift of the independent presser foot and the needle bar does not interfere with each other.

[0003] The independent presser foot technology also develops rapidly, reference the Chinese invention patent application with the public number CN 117802708 A, a kind of independent presser foot driving device is disclosed, including main shaft, first cam and second cam being arranged on main shaft, independent presser foot, first transmission part with first rotation fulcrum, liftably movable presser foot driving block;The first transmission part and the presser foot driving block are directly or indirectly movably connected;The first transmission part has first roller, second roller;The first roller and the outer cam surface of first cam are rolled and matched to make the presser foot driving block drive independent presser foot complete ascending stroke, the second roller and the outer cam surface of second cam are rolled and matched to make the presser foot driving block drive independent presser foot complete descending stroke. Because first cam and second cam need to be arranged on main shaft to complete the ascending stroke and descending stroke of independent presser foot, the head of embroidery machine in axial space increases. UTILITARY MODEL CONTENTS

[0004] In view of the deficiency in the prior art, the technical problem to be solved by the utility model lies in providing a conjugate cam connecting rod mechanism and embroidery machine, to solve the problem of axial space increase caused by simultaneously arranging first cam and second cam in the prior art.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] First, a conjugate cam connecting rod mechanism is provided for driving the presser foot to ascend and descend, the conjugate cam connecting rod mechanism includes a conjugate cam mounted on a main shaft, a conjugate connecting rod assembly driven by the conjugate cam, 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 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 presser foot driving block to ascend and descend.

[0007] Preferably, the conjugate connecting rod assembly further includes a conjugate connecting rod, the conjugate connecting rod is rotatably connected to a first conjugate connecting rod pin, the first conjugate connecting rod pin is arranged below the main shaft, and the first transmission part and the second transmission part are arranged on the conjugate connecting rod.

[0008] Preferably, the conjugate connecting rod is fixed by a conjugate connecting rod A and a conjugate connecting rod B, the first transmission part is arranged on the conjugate connecting rod A, the second transmission part is arranged on the conjugate connecting rod B, the conjugate connecting rod A is provided with an inner sleeve sleeved on the conjugate connecting rod pin, and the conjugate connecting rod B is provided with an adjusting clamp that is tightly fixed by the inner sleeve.

[0009] Preferably, the conjugate connecting rod assembly further comprises a presser foot driving connecting rod rotationally connected with the second conjugate connecting rod pin, and the third transmission part is arranged on the second end of the presser foot driving connecting rod.

[0010] Preferably, the third transmission part is arranged below the presser foot driving block, the presser foot driving block is driven to ascend when the presser foot driving connecting rod ascends, and the presser foot is driven to descend by the presser foot spring when the presser foot driving connecting rod descends.

[0011] Preferably, the conjugate connecting rod assembly further comprises an intermediate connecting rod, and two ends of the intermediate connecting rod are connected with the conjugate connecting rod and the first end of the presser foot driving connecting rod respectively.

[0012] Preferably, the conjugate connecting rod A is provided with a triangular connecting rod frame, and the first transmission part, the first conjugate connecting rod pin and the connecting point with the intermediate connecting rod are arranged on three corners of the triangular connecting rod frame respectively.

[0013] Preferably, the first transmission part is provided with a first roller, the second transmission part is provided with a second roller, and the third transmission part is provided with a third roller.

[0014] Preferably, the presser foot driving connecting rod is a V-shaped connecting rod.

[0015] In addition, the utility model provides an embroidery machine, including independent presser foot driving device, independent presser foot driving device is equipped with conjugate cam connecting rod mechanism.

[0016] The utility model discloses the above-mentioned technical scheme has the following technical effects:

[0017] The conjugate cam connecting rod mechanism comprises a conjugate cam installed on a main shaft, and a conjugate connecting rod assembly driven by the conjugate cam, wherein the conjugate connecting rod assembly is provided with a first transmission part, a second transmission part and a third transmission part.

[0018] These features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings.

DRAWINGS

[0019] The utility model will be further explained in connection with the drawings:

[0020] Figure 1 Is the head structure schematic drawing of embroidery machine in the utility model;

[0021] Figure 2 Is the side view of the head of embroidery machine in the utility model (not show head casing);

[0022] Figure 3 Is the structure schematic drawing of conjugate cam connecting rod mechanism in the utility model;

[0023] Figure 4 Is the structure schematic drawing of independent presser foot independent lifting mechanism and independent presser foot are lifted to the first height state in the utility model;

[0024] Figure 5 Is the structure schematic drawing of independent presser foot independent lifting mechanism and independent presser foot are lifted to the first height state in the utility model;

[0025] Figure 6 Is the structure schematic drawing of independent presser foot independent lifting mechanism and independent presser foot are lifted to the first height state in the utility model;

[0026] Figure 7 Is the structure schematic drawing of independent presser foot independent lifting mechanism and independent presser foot are lifted to the first height state in the utility model;

[0027] Figure 8 Is Figure 7 Partial structure schematic drawing in the utility model;

[0028] Figure 9 Is the relative relationship structure schematic drawing between independent presser foot independent lifting mechanism and conjugate cam connecting rod mechanism when independent presser foot independent lifting mechanism and independent presser foot are lifted to the first height state in the utility model;

[0029] Figure 10 Is the structure schematic drawing of independent presser foot independent lifting mechanism and independent presser foot are not in the action state in the utility model;

[0030] Figure 11 Is Figure 10 Partial structure schematic drawing in the utility model;

[0031] Figure 12 Is the relative relationship structure schematic drawing between independent presser foot independent lifting mechanism and conjugate cam connecting rod mechanism when independent presser foot independent lifting mechanism and independent presser foot are not in the action state in the utility model;

[0032] Figure 13Is the relative relationship structure diagram between the independent presser foot independent lifting mechanism and the conjugate cam connecting rod mechanism in the non-acting state of the independent presser foot independent lifting mechanism and the independent presser foot of the utility model;

[0033] Figure 14 Is the structure diagram of the independent presser foot clutch mechanism in the utility model;

[0034] Figure 15 Is the structure diagram of the independent presser foot clutch mechanism in the utility model;

[0035] The figure mark: conjugate cam connecting rod mechanism 1, conjugate cam 11, inner cam surface 111, outer cam surface 112, conjugate connecting rod B 12, first roller 121, conjugate connecting rod A 13, second roller 131, inner sleeve 132, first conjugate connecting rod pin 14, intermediate connecting rod 15, presser foot drive connecting rod 16, third roller 161;Independent presser foot independent lifting mechanism 2, first presser foot lifting connecting rod 21, lifting part 211, guide roller 212, hinged groove 213, second presser foot lifting connecting rod 22, connecting rod part 221, transmission sleeve 222, transmission boss 223, limiting groove 224, limiting pin 225, guide 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, ring groove 252, transmission pin 253, fixed screw 254, presser foot lifting motor 26, independent presser foot clutch mechanism 3, presser foot clutch piece 31, vertical section 311, oblique section 312, rotation stopping part 313, locking part 314, side concave part 315, clutch pin 32, machine head shell 4, needle bar holder 5, needle bar 51, embroidery needle 511, presser foot 52, presser foot main body 521, presser foot drive block 53, presser foot drive part 531, presser foot positioning block 532, presser foot spring 54, needle bar lower dead point 55, top pin 551, horizontal slide rail mechanism 6, needle bar drive device 7.

DETAILED DESCRIPTION

[0036] The technical solutions of the embodiments of the utility model are explained and described below in combination with the drawings of the embodiments of the utility model, but the following embodiments are only preferred embodiments of the utility model, and not all.

[0037] Those skilled in the art can understand that the features in the following embodiments and embodiments can be combined with each other without conflict.

[0038] The terms used in the present application are merely for the purpose of describing specific embodiments, and are not intended to limit the present application. For example, the words "upper", "lower", "front", "back", "lateral" and other words indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices / elements must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can be internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0042] As Figures 1 to 15As 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The outer cam surface cooperates with the second transmission part to make the presser foot driving block drive the independent presser foot to complete the lifting stroke; the inner cam surface cooperates with the first transmission part to make the presser foot driving block drive the independent presser foot to complete the descending stroke, or vice versa; compared with the prior art, only one conjugate cam needs to be arranged, thereby solving the problem of the increased axial space caused by the arrangement of the first cam and the second cam in the prior art.

[0047] Specifically, the conjugate link assembly includes a conjugate link A 13 and a conjugate link B 12. The conjugate link A 13 is provided with an inner sleeve 132 sleeved on the first conjugate link pin 14. The conjugate link B 12 is fixed by a hoop to the inner sleeve 132 to form an integral whole. In addition, a bearing is arranged between the inner sleeve 132 and the first conjugate link pin 14. The conjugate link A 13 and the conjugate link B 12 are arranged separately and connected by a hoop because the conjugate link A 13 and the conjugate link B 12 need to ensure the relative positional relationship with other components of the conjugate cam link mechanism. Even after the conjugate link A 13 and the conjugate link B 12 are assembled with the related components, the hoop bolt can still be loosened to adjust the relative position between the conjugate link A 13 and the conjugate link B 12, thereby ensuring the relative positional relationship between the conjugate link A 13 and the conjugate link B 12 and other components of the conjugate cam link mechanism.

[0048] In order to reduce wear and impact in 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 arranged on the conjugate link B 12 and is fixed by a hoop to a first roller shaft. A bearing can be arranged between the first roller body and the first roller shaft. The second roller 131 is arranged on the conjugate link A 13 and is fixed by a hoop to a second roller shaft. A bearing can be arranged between the second roller body and the second roller shaft.

[0049] Further, the conjugate link assembly further includes a presser foot driving link 16 rotatably connected to the second conjugate link pin. The third transmission part is arranged on the second end of the presser foot driving link.

[0050] In the embodiment, the third transmission part is arranged below the presser foot driving block 53, and the third transmission part is provided with a third roller 161, and the presser foot driving block 53 is provided with a presser foot driving part 531 protruding upwards above the third roller 161, and the bottom surface of the presser foot driving part 531 is matched with the third roller 161. When the third roller 161 on the presser foot driving connecting rod 16 is lifted upwards, the presser foot driving block 53 is lifted, and when the third roller 161 on the presser foot driving connecting rod 16 is lowered, the presser foot is lowered under the action of the presser foot spring 54 because the presser foot driving connecting rod 16 no longer acts on the presser foot driving block 53. That is, the lifting of the presser foot relies on the action of the conjugate connecting rod mechanism, but the lowering of the presser foot mainly relies on the action of the presser foot spring. Of course, the presser foot driving connecting rod 16 can be connected with a reset torsional spring to ensure better reset.

[0051] Further, the conjugate connecting rod assembly further comprises an intermediate connecting rod 15, and two ends of the intermediate connecting rod 15 are respectively connected with the conjugate connecting rod A 13 and the first end of the presser foot driving connecting rod 16.

[0052] In the embodiment, the conjugate connecting rod A 13 is provided with a triangular connecting rod frame, that is, the horizontal projection of the connecting rod frame is triangular, and the horizontal projections of the first transmission part, the first conjugate connecting rod pin and the connecting point with the intermediate connecting rod are respectively arranged on the three corners of the horizontal projection triangular of the connecting rod frame. In this way, the first transmission part, the first conjugate connecting rod pin and the connecting point with the intermediate connecting rod are staggered and do not interfere with each other in the limited space. Moreover, in the horizontal projection, the conjugate connecting rod B 12, the intermediate connecting rod 15 and the presser foot driving connecting rod 16 are all located on the same side of the conjugate connecting rod A 13, that is, on the same lateral side, so as to form a compact layout in the lateral space and avoid increasing the axial space.

[0053] In some embodiments, the presser foot driving connecting rod 16 is a V-shaped connecting rod having a first side and a second side, and the fulcrum connected with the second conjugate connecting rod pin is located at the joint of the first side and the second side. Preferably, the first side is shorter than the second side, the first side is connected with the intermediate connecting rod 15, and the third transmission part is located on the second side. Since the presser foot driving connecting rod 16 rotates perpendicularly to the horizontal plane, the design of the V-shaped connecting rod can save the front-rear direction space.

[0054] The presser foot working stroke refers to the reciprocating movement of the presser foot between the lowest height of the working stroke and the highest height of the working stroke in the embroidery process. The lowest height of the working stroke of the presser foot is the height when the presser foot is attached to the embroidery cloth, and the embroidery cloth is pressed, so that the needle bar can drive the embroidery needle to work on the embroidery cloth for embroidery. When the highest height of the working stroke of the presser foot, the presser foot is separated from the embroidery cloth by a certain height, and the embroidery cloth can move with the embroidery frame to prepare for subsequent embroidery.

[0055] In the prior art, the independent presser foot driving device only lifts the presser foot to the highest height of the presser foot working stroke, and there is a risk of interfering with the embroidery cloth during color changing and when the presser foot is not working. Therefore, the presser foot can be lifted to a height higher than the presser foot working stroke, i.e. higher than the highest height of the presser foot working stroke, which can be defined as a first height, i.e. a non-working height.

[0056] As shown in Figures 4 to 13 In order to lift the presser foot to the non-working height, an independent presser foot independent lifting mechanism 2 is also provided for lifting the presser foot to the first height, which is higher than the highest point of the presser foot working stroke. The independent lifting here means that a completely independent independent presser foot independent lifting mechanism is provided separately from the original independent presser foot driving device in the prior art.

[0057] In the present embodiment, the independent presser foot independent lifting mechanism 2 includes a presser foot lifting motor 26 and a presser foot lifting component driven by the presser foot lifting motor 26, which is provided with a lifting part 211 supported below the presser foot driving block 53 during lifting, and the lifting part 211 has a avoiding state away from below the presser foot driving block during the presser foot working process, at which time the independent presser foot independent lifting mechanism 2 does not act, and the presser foot working is driven by the conjugate cam connecting rod mechanism 1. The lifting part 211 is not directly connected with the presser foot driving block, but is movably supported below the presser foot driving block, so that it directly acts with the presser foot driving block during lifting, and can be separated from the presser foot driving block and avoid below the presser foot driving block when not lifting.

[0058] Like the third roller 161, the lifting part 211 also acts with the bottom surface of the presser foot driving part 531. It can be understood that since the lifting part 211 and the third roller 161 are both below the presser foot driving block and both move up and down, in order to avoid mutual influence and realize the independent function of the independent presser foot independent lifting mechanism 2, the lifting part 211 and the third roller 161 are staggered in the transverse direction. The lifting part 211 can also be provided with a lifting roller, and here the lifting part is provided with a circular arc surface to act with the bottom surface of the presser foot driving part 531.

[0059] In some embodiments, the presser lifting component comprises a presser lifting link and a guide 23, the presser lifting link moves along the guide. Specifically, the presser lifting link comprises a first presser lifting link 21 and a second presser lifting link 22, the lifting portion 211 is arranged at a first end of the first presser lifting link, a second end of the first presser lifting link 21 is hingedly connected with a first end of the second presser lifting link 22, the first presser lifting link 21 is provided with a guide portion which is guided by the guide 23, and a presser lifting motor 26 drives the second presser lifting link 22 to rotate. Specifically, the guide 23 is provided with a guide groove 231 extending upward and downward, and the guide portion ascends and descends along the guide groove. Preferably, the guide portion is provided with a guide roller 212 which is in rolling contact with the guide groove 231. In this way, when the second presser lifting link 22 rotates, the first presser lifting link 21 and the second presser lifting link 22 can also rotate relatively, and at the same time, the guide roller 212 is driven to ascend and descend in the guide groove 231.

[0060] Specifically, the second end of the first presser lifting link 21 is provided with a hinged groove 213 which has a U-shaped structure, and a pin shaft is connected between the two side walls, and the first end of the second presser lifting link 22 is hingedly connected in the hinged groove through the pin shaft. Among them, the transverse projections of the lifting portion 211, the guide portion (the guide roller 212) and the hinged groove 213 are respectively located at the three apexes of the triangle, and the lifting portion and the guide portion are correspondingly arranged on the transverse two sides of the hinged groove. Among them, the lifting portion extends obliquely upward below the presser driving block, the guide portion also extends obliquely upward, but the oblique extension direction is opposite to that of the lifting portion, and the two form an acute angle, and at the same time, the guide portion and the lifting portion are also avoided in the front and rear directions, so that the guide roller 212 can ascend and descend along the guide groove. The lifting portion and the guide portion are correspondingly arranged on the transverse two sides of the hinged groove, so as to avoid interference between them in the transverse space.

[0061] Specifically, the second presser foot lifting link 22 is provided with a link portion 221 hinged with the first presser foot lifting link 21, and a transmission sleeve 222 is arranged at a second end of the second presser foot lifting link 22 and connected with the second end of the link portion 221 in an axial direction. 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 arranged, so as to leave space for the above-mentioned conjugate link assembly on the other side. The transmission sleeve 222 is rotatably supported on the rotating shaft 24, and a transmission assembly is arranged 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 through the transmission assembly, i.e. the rotation of the second presser foot lifting link can be realized. The transmission assembly includes a rotating element for driving the transmission sleeve to rotate. For example, the rotating element can be a gear, a sprocket or the like. In the embodiment, a belt pulley is selected, and a synchronous belt is connected with the presser foot lifting motor 26. In this way, the presser foot lifting motor 26 can be arranged at the rear side of the machine head, without occupying the space of the machine head.

[0062] In addition, a return torsion spring is arranged between the transmission sleeve 222 and the rotating shaft 24, for realizing the return of the second presser foot lifting link 22.

[0063] In the embodiment, a synchronous belt assembly is arranged between the presser foot lifting motor 26 and the presser foot lifting component. The synchronous belt assembly includes a driving belt pulley connected with the output shaft of the presser foot lifting motor 26, a driven belt pulley 25 connected with the rotating shaft 24, and a synchronous belt connecting the driving belt pulley and the driven belt pulley. It can be understood that the synchronous belt assembly can also be replaced by a gear transmission assembly or a chain transmission assembly, so that the above-mentioned rotating element can be a gear, a sprocket or the like.

[0064] As described below, since the driven belt pulley has a dual function, in addition to driving the above-mentioned second presser foot lifting link 22, it also needs to drive the rotating shaft 24 to rotate, for adjusting the working stroke of the presser foot. In this way, the common problem of the driving components of the independent presser foot independent lifting mechanism and the independent presser foot working stroke adjusting structure is solved. However, when the rotating shaft 24 rotates to adjust the working stroke of the presser foot, the independent presser foot independent lifting mechanism should not work. Therefore, in order to avoid the transmission sleeve 222 from rotating when the driven belt pulley 25 drives the rotating shaft 24 to rotate, a one-way transmission structure is specially designed between the driven belt pulley 25 and the transmission sleeve 222. The driven belt pulley 25 has a first rotation angle and a second rotation angle. Within the first rotation angle, the driven belt pulley 25 drives the transmission sleeve 222 to rotate through the one-way transmission structure, and the presser foot lifting link is driven to rotate by the transmission sleeve. Within the second rotation angle, the driven belt pulley 25 drives the rotating shaft 24 to rotate, and the second conjugate link pin is driven to rotate by the rotating shaft, for adjusting the working stroke of the presser foot. At this time, the one-way transmission structure does not transmit.

[0065] The one-way transmission structure comprises a transmission boss 223 arranged at the axial first end of the transmission sleeve and a transmission member arranged at the second end of the driven pulley. The transmission boss 223 protrudes from the axial first end of the transmission sleeve at a local circular arc position to the axial first side. The transmission member can be a transmission pin 253. The transmission pin 253 and the transmission boss 223 correspond in the axial direction of the rotating shaft, so that the driven pulley drives the transmission sleeve to rotate within the 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 is provided with a ring groove 252 around the rotating shaft. The transmission pin 253 is arranged in the ring groove 252. The end plate 251 is provided with a fixing hole at a position radially deviated from the rotating shaft. The end portion of the transmission pin 253 can be fixed to the fixing hole through interference fit. In addition, the transmission boss 223 also extends into the ring groove 252.

[0066] Therefore, within the first rotation angle of the driven pulley 25, the transmission pin 253 and the transmission boss 223 act to drive the transmission sleeve 222 to rotate, and finally drive the lifting part 211 to lift. Within the second rotation angle, the transmission pin is located in a rotation angle avoiding the transmission boss, and the transmission pin and the transmission boss do not act. Therefore, when adjusting the working stroke of the presser foot, the independent presser foot independent lifting mechanism does not work, and the driven pulley 25 can be forward rotated or reverse rotated. This angle is used to adjust the working stroke of the presser foot, which can increase or decrease the working stroke of the presser foot.

[0067] It can be understood that the "first rotation angle" and "second rotation angle" in the first rotation angle and the second rotation angle of the driven pulley 25 are only used to distinguish the functions thereof. In addition, although the driven pulley has the function of driving the rotating shaft to rotate within the first rotation angle, at this time, the conjugate cam linkage mechanism 1 does not work, and therefore the influence on the conjugate cam linkage mechanism 1 can be ignored. Only when the working stroke of the presser foot is adjusted to the position before the conjugate cam linkage mechanism 1 works again.

[0068] The reason why the conjugate linkage mechanism 1, the independent presser foot independent lifting mechanism 2 and the independent presser foot working stroke adjusting structure are combined is mainly due to the limitation of the space inside the machine head. In the present embodiment, the independent presser foot independent lifting mechanism 2 and the independent presser foot working stroke adjusting structure share the driving source, i.e., the presser foot lifting motor 26 and the driven pulley 25. In addition, the conjugate linkage mechanism 1, the independent presser foot independent lifting mechanism 2 and the independent presser foot working stroke adjusting structure share the rotating shaft 24. The segmented design of the corresponding functions can reduce the number of parts, save space and reduce the cost.

[0069] The independent presser foot driven by the main shaft in the prior art cannot adjust the working stroke of the independent presser foot because the rotation angle of the main shaft is fixed, and the adaptability to embroidery with different thickness is poor, which affects the quality of the embroidery. Therefore, in some embodiments, an independent presser foot working stroke adjusting structure is further provided to adjust the working stroke of the presser foot. Specifically, the second conjugate connecting rod pin 243 is not independently provided, but is integrated with the rotating shaft 24, and is specifically provided at an eccentric position of the rotating shaft 24. The rotating shaft 24 drives the second conjugate connecting rod pin 243 to rotate, and the eccentric angle (the relative position of the eccentric position in the circumferential direction of the rotating shaft) of the second conjugate connecting rod pin is used to adjust the fulcrum position of the presser foot driving connecting rod 16, so as to adjust the working stroke of the presser foot. After the adjustment is completed, the presser foot lifting motor 26 stops working, and the second conjugate connecting rod pin 243 maintains the adjusted eccentric angle. During the rotation of the second conjugate connecting rod pin, the intermediate connecting rod 15 will also rotate to some position, but the entire conjugate cam connecting rod mechanism 1 is not working, and the conjugate connecting rod will not move.

[0070] Because the rotating shaft plays a role in the independent presser foot independent lifting mechanism 2 and the independent presser foot working stroke adjusting structure, the structure of the rotating shaft is specially designed, wherein the two ends of the rotating shaft 24 are respectively provided with a first shaft end 241 and a second shaft end 242, the first end of the driven pulley is provided with an end plate 251, the center of the end plate is provided with a insertion hole, the first shaft end 241 is inserted into the insertion hole, and the end plate 251 is connected with a fixing screw 254 for fixing the first shaft end, so as to lock and fix the driven pulley and the rotating shaft. The fixing screw 254 can be a internal hexagonal screw, or a handle can be provided to facilitate tightening. Alternatively, other fixing methods can also be used. In this way, the first shaft end and the driven pulley are fixed, and 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. the second conjugate connecting rod pin is eccentrically arranged. In addition, the second shaft end 242 is rotatably supported at the fulcrum, and the fulcrum is located on the machine head shell 4.

[0071] Further, the rotating shaft 24 is provided with a fulcrum segment between the first shaft end 241 and the second conjugate connecting rod pin 243, and the diameter of the fulcrum segment is greater than that of the first shaft end 241 and the second conjugate connecting rod pin 243. The transmission sleeve 222 is connected with the fulcrum segment, and a bearing or a bushing can be arranged therebetween to realize smooth rotation, reduce noise and wear.

[0072] It can be understood that the independent presser foot will not be lifted simultaneously when the working stroke of the independent presser foot is adjusted. In addition, the transmission sleeve is provided with a circumferential limiting groove 224 along the local circumferential direction, and a limiting pin 225 is connected at a corresponding axial position of the rotating shaft, and the limiting pin 225 is limitedly matched with the circumferential limiting groove 224.

[0073] Preferably, the second conjugate connecting rod pin 243 is provided with a bearing or bushing between the pin hole of the presser foot driving connecting rod to realize smooth rotation, reduce noise and wear, and further, the outer circular surface of the second conjugate connecting rod pin can be provided with a lubricating groove and added with lubricating grease.

[0074] The independent presser foot independent lifting mechanism 2 lifts the presser foot to the first height, wherein the presser foot lifting motor 26 serves as the driving source and also has other functions. Therefore, Figures 4 to 15 As shown, in some embodiments, in order to keep the presser foot at the non-working height, the independent presser foot clutch mechanism 3 is also provided, which can lock the presser foot after the presser foot is lifted to the first height by the independent presser foot independent lifting mechanism 2. In this way, the presser foot lifting motor can stop working and also has other functions, such as adjusting the working stroke of the presser foot.

[0075] The independent presser foot clutch mechanism 3 includes a presser foot positioning block 532 connected with and synchronously lifted with the presser foot, and a presser foot clutch piece 31 which can move relative to the presser foot positioning block when driven, the presser foot clutch piece 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 piece 31 has a locking portion 314 which is locked with the presser foot positioning block 532 when the presser foot clutch piece 31 is at the second position and is unlocked with the presser foot positioning block 532 when the presser foot clutch piece 31 is at the first position. The presser foot positioning block 532 is fixedly connected with the presser foot driving block 53 or is integrally arranged, and is protrudingly arranged forward to facilitate cooperation with the locking portion 314.

[0076] Specifically, the presser foot clutch piece 31 is rotatably installed on the needle bar holder 5 through a clutch pin 32, and is driven to rotate by a clutch driving component. The presser foot clutch piece 31 can rotate relative to the clutch pin 32 to realize locking and unlocking with the presser foot positioning block. The presser foot clutch piece has a first angle (i.e. the first position mentioned above) corresponding to the working state of the presser foot and a second angle (i.e. the second position mentioned above) corresponding to the height of the non-working state of the presser foot, and the locking portion 314 is unlocked with the presser foot positioning block 532 when the presser foot clutch piece is at the first angle.

[0077] The clutch driving component includes a clutch spring (not shown in the figure), which makes the presser foot clutch piece have a tendency to rotate from the second angle to the first angle, i.e. if there is no other external force to block, the clutch spring will make the presser foot clutch piece rotate to the first angle and be unlocked with the presser foot positioning block. Specifically, the clutch spring is a clutch torsion spring which is installed on the clutch pin and connected with the presser foot clutch piece.

[0078] Further, the clutch driving part further comprises a needle bar lower dead point 55, the presser foot clutch plate 31 has a rotation stopping part 313, the needle bar lower dead point 55 cooperates with the rotation stopping part 313 to make the presser foot clutch plate at the second angle. Specifically, the needle bar lower dead point 55 is provided with a top pin 551, the top pin 551 rises, cooperates with the rotation stopping part 313, pushes the presser foot clutch plate 31 to rotate to the second angle, and finally makes the presser foot clutch plate 31 rotate to the second angle, so that the locking part 314 is locked with the presser foot positioning block 532. That is, the locking part is locked with the presser foot positioning block by means of the rising of the needle bar.

[0079] Specifically, the presser foot clutch plate 31 comprises a vertical section 311 and an inclined section 312 extending obliquely upward from one side of the top end of the vertical section, and the inclined section is connected with the clutch pin 32. Wherein, the bottom end of the inclined section extends to the other side of the vertical section and forms the rotation stopping part 313. The lower side of one side of the vertical section is provided with a side recess 315, and the locking part 314 is arranged at the bottom side of the side recess. The above design of the presser foot clutch plate 31 is to minimize the space occupation in the transverse direction, because the distance between the two adjacent needle bars is small. Taking the design of the inclined section 312 as an example, the rotation stopping part 313 is formed, and at the same time, the top of the inclined section of one of the two adjacent presser foot clutch plates 31 extends above the bottom of the inclined section of the other.

[0080] In this way, when the presser foot is not working, the top pin 551 pushes upward against the rotation stopping part 313, so that the presser foot clutch plate remains in an approximately vertical state (the second angle), and at the same time, the presser foot positioning block 532 is locked by the locking part 314 and cannot be lowered. When the presser foot is working, the presser foot clutch plate 31 deflects a certain angle to the first angle under the action of the elastic force of the clutch spring, so that the locking part 314 is disengaged from the presser foot positioning block 532, and the presser foot can work normally.

[0081] It can be understood that the connecting rod involved in the embodiment refers to a function similar to a connecting rod, but the shape is not limited to a rod structure, and a bearing or a bushing can be arranged between the connecting rod and the connecting rod pin.

[0082] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the above specific implementation and the drawings. Any modification without deviating from the function and structural principle of the utility model will be included in the scope of the claims.

Claims

1. A conjugate cam link mechanism for driving the raising and lowering of a presser foot, characterised in that, The conjugate cam connecting rod mechanism comprises a conjugate cam installed on a main shaft, a conjugate connecting rod assembly driven by the conjugate cam, 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, the second transmission part is matched with the outer cam surface, and the third transmission part is used for driving a presser foot driving block.

2. The conjugate cam link mechanism according to claim 1, characterized in that, The conjugate connecting rod assembly further comprises a conjugate connecting rod, the conjugate connecting rod is rotationally connected to a first conjugate connecting rod pin, the first conjugate connecting rod pin is arranged below the main shaft, and the first transmission part and the second transmission part are arranged on the conjugate connecting rod.

3. The conjugate cam link mechanism according to claim 2, wherein The conjugate connecting rod is fixed together by a conjugate connecting rod A and a conjugate connecting rod B, the first transmission part is arranged on the conjugate connecting rod A, the second transmission part is arranged on the conjugate connecting rod B, the conjugate connecting rod A is provided with an inner sleeve sleeved on the conjugate connecting rod pin, and the conjugate connecting rod B is provided with an adjusting holding hoop for holding the inner sleeve.

4. The conjugate cam link mechanism according to claim 3, wherein The conjugate connecting rod assembly further comprises a presser foot driving connecting rod rotationally connected to a second conjugate connecting rod pin, and the third transmission part is arranged on a second end of the presser foot driving connecting rod.

5. The conjugate cam link mechanism of claim 4, wherein, The third transmission part is arranged below the presser foot driving block, when the presser foot driving connecting rod is lifted upward, the presser foot driving block is lifted, and when the presser foot driving connecting rod is lowered, the presser foot is lowered under the action of a presser foot spring.

6. The conjugate cam link mechanism of claim 4, wherein, The conjugate connecting rod assembly further comprises an intermediate connecting rod, two ends of the intermediate connecting rod are respectively connected to the conjugate connecting rod and a first end of the presser foot driving connecting rod.

7. The conjugate cam link mechanism of claim 6, wherein, The conjugate connecting rod A is provided with a triangular connecting rod frame, the first transmission part, the first conjugate connecting rod pin and a connecting point with the intermediate connecting rod are respectively arranged on three corners of the triangular connecting rod frame.

8. The conjugate cam link mechanism of claim 4, wherein, The first transmission part is provided with a first roller, the second transmission part is provided with a second roller, and the third transmission part is provided with a third roller.

9. The conjugate cam link mechanism of claim 4, wherein, The presser foot driving connecting rod is a V-shaped connecting rod.

10. Embroidery machine comprising independent presser foot drive means, characterised in that, The independent presser foot driving device is provided with the conjugate cam connecting rod mechanism in any one of claims 1 to 9.

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