Conjugate cam connecting rod mechanism and embroidery machine

Abstract

The invention 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 mounted 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 present invention belongs to the technical field of embroidery equipment, and particularly relates to an embroidery machine.

Background Art

[0002] In the technical field of embroidery machines, the driving of the presser foot is divided into two types. One is combined with the movement of the needle bar, and the needle bar drives the presser foot to perform reciprocating lifting motion. The other is an independent presser foot, which is driven by an independent power source to perform reciprocating lifting motion, and the reciprocating lifting motions of the independent presser foot and the needle bar do not interfere with each other.

[0003] The technology of the independent presser foot has also developed rapidly. Referring to the Chinese patent application for invention with the publication number CN 117802708 A, it discloses an independent presser foot driving device, including a main shaft, a first cam and a second cam arranged on the main shaft, an independent presser foot, a first transmission member having a first rotation fulcrum, and a liftable presser foot driving block; the first transmission member and the presser foot driving block are directly or indirectly movably connected; the first transmission member has a first roller and a second roller; the first roller rolls with the outer cam surface of the first cam so that the presser foot driving block drives the independent presser foot to complete the upward stroke, and the second roller rolls with the outer cam surface of the second cam so that the presser foot driving block drives the independent presser foot to complete the downward stroke. Since it is necessary to simultaneously arrange the first cam and the second cam 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.

Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a conjugate cam-linkage mechanism and an embroidery machine, so as to solve the problem of increased axial space caused by simultaneously arranging the first cam and the second cam in the prior art.

[0005] To solve the above technical problem, the present invention adopts the following technical solutions:

[0006] First, a conjugate cam-linkage mechanism is provided for driving the presser foot to rise and fall. The conjugate cam-linkage mechanism includes a conjugate cam installed on the main shaft and a conjugate link assembly driven by the conjugate cam. The conjugate cam is provided with an inner cam surface and an outer cam surface; the conjugate link 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 rise and fall.

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

[0008] Preferably, the conjugate link is fixed together by a conjugate link A and a conjugate link B, the first transmission part is arranged on the conjugate link A, the second transmission part is arranged on the conjugate link B, the conjugate link A is provided with an inner sleeve which is externally mounted on the conjugate link pin, and the conjugate link B is provided with an adjustment hoop which is clamped and fixed by the inner sleeve.

[0009] Preferably, the conjugate link assembly further comprises a presser foot driving link rotatably connected to the second conjugate link pin, and the third transmission part is arranged at the second end of the presser foot driving link.

[0010] Preferably, the third transmission part is arranged below the presser foot driving block, and when the presser foot driving connecting rod is lifted upward, the presser foot driving block is driven to rise, and when the presser foot driving connecting rod is lowered, the presser foot is lowered under the action of the presser foot spring.

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

[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 connection point with the intermediate connecting rod are respectively arranged on the three corners of the triangle.

[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 present invention further provides an embroidery machine, comprising an independent presser foot driving device, wherein the independent presser foot driving device is provided with the conjugate cam connecting rod mechanism.

[0016] The present invention adopts the above technical solution and has the following technical effects:

[0017] The conjugate cam connecting rod mechanism of the present invention comprises a conjugate cam installed on a main shaft, a conjugate connecting rod assembly driven by the conjugate cam, and the conjugate connecting rod assembly is provided with a first transmission part, a second transmission part and a third transmission part. The outer cam surface cooperates with the second transmission part, so that the presser foot driving block drives the independent presser foot to complete the ascending stroke; the inner cam surface cooperates with the first transmission part, so that the presser foot driving block drives the independent presser foot to complete the descending stroke. Compared with the prior art, only one conjugate cam is required, so as to solve the problem of increased axial space caused by simultaneously setting the first cam and the second cam in the prior art.

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

Brief Description of the Drawings

[0019] The present invention will be further described below in conjunction with the accompanying drawings:

[0020] Figure 1 It is a schematic structural diagram of the head of the embroidery machine in the present invention;

[0021] Figure 2 It is a side view of the head of the embroidery machine in the present invention (the head housing is not shown);

[0022] Figure 3 It is a schematic structural diagram of the conjugate cam link mechanism in the present invention;

[0023] Figure 4 It is a schematic structural diagram of the independent presser foot independent lifting mechanism in the present invention when the independent presser foot is lifted to the first height state;

[0024] Figure 5 It is a schematic structural diagram of the independent presser foot independent lifting mechanism in the present invention when the independent presser foot is lifted to the first height state;

[0025] Figure 6 It is a schematic structural diagram of the independent presser foot independent lifting mechanism in the present invention when the independent presser foot is lifted to the first height state;

[0026] Figure 7 It is a schematic structural diagram of the independent presser foot independent lifting mechanism in the present invention when the independent presser foot is lifted to the first height state;

[0027] Figure 8 is Figure 7 a partial structural diagram in;

[0028] Figure 9 It is a schematic structural diagram of the relative relationship between the independent presser foot independent lifting mechanism and the conjugate cam link mechanism when the independent presser foot is lifted to the first height state by the independent presser foot independent lifting mechanism in the present invention;

[0029] Figure 10 It is a schematic structural diagram of the independent presser foot independent lifting mechanism and the state where the independent presser foot does not act in the present invention;

[0030] Figure 11 is Figure 10 a partial structural diagram in;

[0031] Figure 12 It is a schematic structural diagram of the relative relationship between the independent presser foot independent lifting mechanism and the conjugate cam link mechanism when the independent presser foot does not act by the independent presser foot independent lifting mechanism in the present invention;

[0032] Figure 13 It is a schematic structural diagram of the relative relationship between the independent presser foot independent lifting mechanism and the conjugate cam link mechanism when the independent presser foot does not act by the independent presser foot independent lifting mechanism in the present invention;

[0033] Figure 14 This is a schematic structural diagram of the independent presser foot clutch mechanism in the present invention;

[0034] Figure 15 This is a schematic structural diagram of the independent presser foot clutch mechanism in the present invention;

[0035] Reference numerals: conjugate cam linkage mechanism 1, conjugate cam 11, inner cam surface 111, outer cam surface 112, conjugate link B 12, first roller 121, conjugate link A 13, 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 independent lifting mechanism 2, first presser foot lifting link 21, lifting portion 211, guide roller 212, hinge groove 213, second presser foot lifting link 22, link portion 221, transmission sleeve 222, transmission boss 223, limit groove 224, limit pin 225, guide member 23, guide groove 231, rotating shaft 24, first shaft end 241, second shaft end 242, second conjugate link 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, inclined section 312, anti-rotation portion 313, locking portion 314, side recess 315, clutch pin 32, machine head housing 4, needle bar holder 5, needle bar 51, embroidery needle 511, presser foot 52, presser foot body 521, presser foot drive block 53, presser foot drive portion 531, presser foot positioning block 532, presser foot spring 54, lower dead center of needle bar 55, top pin 551, horizontal slide rail mechanism 6, needle bar drive device 7.

Detailed implementation manners

[0036] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

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

[0038] The terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. For example, terms indicating orientation or positional relationships such as "upper", "lower", "front", "rear", "lateral", etc. are based only on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the invention.

[0039] In this invention, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this invention can be understood according to specific circumstances.

[0040] In this invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0041] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" can explicitly or implicitly include at least one such feature.

[0042] Such as Figures 1 to 15As shown in the figure, the embroidery machine is provided with at least one machine head. The machine head includes a machine head housing 4 and a needle bar holder 5 provided on the front side of the machine head housing. A transverse slide rail mechanism 6 is provided between the needle bar holder 5 and the machine head housing 4. In this embodiment, the relative direction between the needle bar holder 5 and the machine head housing 4 is defined as the front-back direction, and the moving direction of the needle bar holder 5 is defined as the transverse direction, or also called the left-right direction. The embroidery machine is provided with a main shaft that extends transversely and penetrates each machine head housing. The main shaft serves as a power source to drive the needle bar 51 provided on the needle bar holder to perform reciprocating lifting motion, so that the embroidery needle at the bottom of the needle bar can embroider on the embroidery cloth. In addition, when color change is required, the needle bar holder 5 slides transversely along the transverse slide rail mechanism 6. During this process, the original needle bar and presser foot for embroidery need to be lifted to a certain height away from the embroidery cloth.

[0043] Among them, a needle bar 51 is installed on the needle bar holder 5. The needle bar is provided with a lower dead point 55 of the needle bar. An embroidery needle 511 is provided at the bottom of the needle bar 51. A presser foot 52 is installed on the needle bar 51. A presser foot body 521 is provided at the bottom of the presser foot 52. The presser foot is connected with a presser foot driving block 53 and a presser foot spring 54. The presser foot driving block 53 is movably connected with the needle bar 51. When the presser foot driving block 53 drives the presser foot to rise, it squeezes the presser foot spring 54 upward. When the presser foot driving block 53 descends, the presser foot spring 54 returns to its original position. In addition, the machine head includes a needle bar driving device 7 for driving the needle bar, and an independent presser foot driving device for driving the presser foot 52.

[0044] As Figure 3 shown in the figure, in this embodiment, the independent presser foot driving device is provided with a conjugate cam link mechanism 1. The conjugate cam link mechanism 1 includes a conjugate cam 11 installed on the main shaft and a conjugate link assembly driven by the conjugate cam. The conjugate cam 11 is provided with an inner cam surface 111 and an outer cam surface 112. The conjugate link 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, and the second transmission part cooperates with the outer cam surface. And, the first transmission part and the second transmission part always act on the inner cam surface and the outer cam surface of the conjugate cam, so as to maintain the relative position of the conjugate link assembly. In addition, the third transmission part is used to drive the presser foot driving block to rise and fall.

[0045] Among them, the conjugate link assembly includes a conjugate link. The conjugate link is rotatably connected to a first conjugate link pin 14. The first conjugate link pin 14 is provided below the main shaft. The first transmission part and the second transmission part are provided on the conjugate link. The first conjugate link pin 14 is installed on the machine head housing 4.

[0046] In the above conjugate cam-link mechanism, the outer cam surface cooperates with the second transmission part, so that the presser foot driving block drives the independent presser foot to complete the ascending stroke; the inner cam surface cooperates with the first transmission part, so that the presser foot driving block drives the independent presser foot to complete the descending stroke, or vice versa; compared with the prior art, only one conjugate cam needs to be provided, solving the problem of the increased axial space caused by the simultaneous setting of the first cam and the second cam in the prior art.

[0047] Specifically, the conjugate link assembly includes a conjugate link A13 and a conjugate link B12. The conjugate link A13 is provided with an inner sleeve 132 sleeved on the first conjugate link pin 14. The conjugate link B12 is fixedly clamped to the inner sleeve 132 through a hoop to form a whole. In addition, a bearing is provided between the inner sleeve 132 and the first conjugate link pin 14. The reason for separately setting the conjugate link A13 and the conjugate link B12 and connecting them through a hoop is that the conjugate link A13 and the conjugate link B12 need to ensure the relative position relationship with other components of the conjugate cam-link mechanism. Even after the conjugate link A13 and the conjugate link B12 are assembled with the relevant components, the hoop bolts can still be loosened to adjust the relative position between the conjugate link A13 and the conjugate link B12, so as to ensure the relative position relationship between the conjugate link A13 and the conjugate link B12 and other components of the conjugate cam-link mechanism.

[0048] In order 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 arranged on the conjugate link B12, and the first roller shaft is fixedly clamped by a hoop. 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 A13, and the second roller shaft is fixedly clamped by a hoop. A bearing can be arranged between the second roller body and the second roller shaft.

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

[0050] In this 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. The presser foot driving block 53 is provided with a presser foot driving part 531 protruding upward 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 link 16 is lifted upward, the presser foot driving block 53 is driven to rise. When the third roller 161 on the presser foot driving link 16 descends, since the presser foot driving link 16 no longer acts on the presser foot driving block 53, the presser foot can descend under the action of the presser foot spring 54. That is, the rise of the presser foot depends on the action of the conjugate link mechanism, but the descent of the presser foot mainly depends on the action of the presser foot spring. Of course, the presser foot driving link 16 can be connected with a return torsion spring to ensure better reset.

[0051] Furthermore, the conjugate link assembly further includes an intermediate link 15, and both ends of the intermediate link 15 are respectively connected to the conjugate link A13 and the first end of the presser foot driving link 16.

[0052] In this embodiment, the conjugate link A13 is provided with a triangular link frame, that is, the horizontal projection of the link frame is triangular, and the horizontal projections of the first transmission part, the first conjugate link pin and the connection point with the intermediate link are respectively arranged at the three corners of the triangular horizontal projection 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 and do not interfere with each other. And, in the horizontal projection, the conjugate link B12, the intermediate link 15 and the presser foot driving link 16 are all located on the same side of the conjugate link A13, that is, the same horizontal side, so as to form a compact layout in the horizontal space and avoid causing an increase in the axial space.

[0053] In some of these embodiments, the presser foot driving link 16 is a V-shaped link, having a first side and a second side, and the fulcrum connected to the second conjugate link pin is located at the position where the first side and the second side meet. Preferably, the first side is shorter than the second side, and 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 driving link 16 rotates perpendicular to the horizontal plane, designing it as a V-shaped link can save space in the front-back direction.

[0054] The working stroke of the presser foot refers to the reciprocating movement of the presser foot between the lowest height and the highest height of the working stroke during the embroidery process. The lowest height of the working stroke of the presser foot is the height when the presser foot is in contact with the embroidery fabric, pressing the embroidery fabric, so that the needle bar can drive the embroidery needle to work on the embroidery fabric for embroidery. When the presser foot reaches the highest height of the working stroke, the presser foot leaves the embroidery fabric by a set height, and the embroidery fabric can move along 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 working stroke of the presser foot. During color change and when the presser foot is in a non-working state, there is a risk of interfering with the embroidery fabric. Therefore, the presser foot can be lifted to a height higher than the working stroke of the presser foot, that is, higher than the highest height of the working stroke of the presser foot, which can be defined here as the first height, namely the non-working height.

[0056] As Figures 4 to 13 shown, in order to lift the presser foot to the non-working height, an independent presser foot independent lifting mechanism 2 is also provided, which is used to lift the presser foot to the first height, and the first height is higher than the highest point of the working stroke of the presser foot. The meaning of the independent lifting here is to separate from the original independent presser foot driving device in the prior art and completely independently set up an independent presser foot independent lifting mechanism.

[0057] In this 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. The presser foot lifting component is provided with a lifting part 211 that supports under the presser foot driving block 53 during the lifting process. The lifting part 211 has an avoidance state of leaving under the presser foot driving block during the working process of the presser foot. At this time, the independent presser foot independent lifting mechanism 2 does not act, and the presser foot is driven to work by the conjugate cam link mechanism 1. The lifting part 211 is not directly connected to the presser foot driving block, but is movably supported under the presser foot driving block. In this way, it directly acts on the presser foot driving block during lifting, and can be separated from the presser foot driving block and avoid the area under the presser foot driving block when not lifting.

[0058] Similar to the third roller 161, the lifting part 211 also acts on the bottom surface of the presser foot driving part 531. It can be understood that since both the lifting part 211 and the third roller 161 are under 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 horizontal direction. The lifting part 211 can also be provided with a lifting roller, and here the lifting part is provided with an arc surface that acts on the bottom surface of the presser foot driving part 531.

[0059] In some of these embodiments, the presser foot lifting member includes a presser foot lifting link and a guide member 23, and the presser foot lifting link moves 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. The lifting portion 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 guiding portion that is guidingly engaged with the guide member 23. A 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, and the guiding portion rises and falls along the guide groove. Preferably, the guiding portion is provided with a guide roller 212, and the guide roller 212 is in rolling engagement 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 guide roller 212 is driven to rise and fall in the guide groove 231.

[0060] 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 shaft is connected between the two side walls. The first end of the second presser foot lifting link 22 is hinged in the hinge groove through the pin shaft. Among them, the transverse projections of the lifting portion 211, the guiding portion (guide roller 212), and the hinge groove 213 are respectively located at the three vertex positions of a triangle, and the lifting portion and the guiding portion are correspondingly arranged on the transverse two sides of the hinge groove. The lifting portion extends obliquely upward and downward under the presser foot driving block, and the guiding portion also extends obliquely upward, but in a direction opposite to the oblique extension direction of the lifting portion. An acute angle is formed between the two, and at the same time, the guiding portion and the lifting portion are avoided in the front-rear direction, so that the guide roller 212 can rise and fall along the guide groove. The lifting portion and the guiding portion are correspondingly arranged on the transverse two sides of the hinge groove to avoid interference between the two in the transverse space.

[0061] Specifically, the second presser foot lifting link 22 is provided with a link portion 221. The link portion 221 is hinged to the first presser foot lifting link 21. The second end of the second presser foot lifting link 22 is provided with a transmission sleeve 222. The axial direction of the transmission sleeve 222 is 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, that is, the side where the guiding member is located, 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. A transmission assembly is provided between the transmission sleeve 222 and the presser foot lifting motor 26. Thus, the presser foot lifting motor can drive the transmission sleeve to rotate through the transmission assembly, and the rotation of the second presser foot lifting link can be realized. Among them, the transmission assembly includes a rotating element, and the transmission sleeve is driven to rotate by the rotating element. For example, the rotating element can be a gear, a sprocket, etc. In this embodiment, a belt pulley is selected and connected to the presser foot lifting motor 26 through a synchronous belt. 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 part.

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

[0063] In this 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 to the output shaft of the presser foot lifting motor 26, a driven belt pulley 25 connected to 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, etc. Thus, the above-mentioned rotating element can be a gear, a sprocket, etc.

[0064] As recorded below, since the driven belt pulley has a dual function, in addition to driving the above-mentioned second presser foot lifting link 22, it is also necessary to drive the rotating shaft 24 to rotate to adjust the working stroke of the presser foot. Thus, the problem of sharing the driving components of the independent presser foot independent lifting mechanism and the independent presser foot working stroke adjustment structure is solved. However, when the rotating shaft 24 rotates to adjust the working stroke of the presser foot, it is necessary to avoid the operation of the independent presser foot independent lifting mechanism. Therefore, in order to avoid the rotation of the transmission sleeve 222 when the driven belt pulley 25 drives the rotating shaft 24 to rotate. Therefore, a one-way transmission structure between the driven belt pulley 25 and the transmission sleeve 222 is specifically designed. The driven belt pulley 25 has a first rotation angle and a second rotation angle. Within the first rotation angle of the driven belt pulley 25, the transmission sleeve 222 is driven 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 of the driven belt pulley 25, the rotating shaft 24 is driven to rotate, and the second conjugate link pin is driven to rotate by the rotating shaft to adjust the working stroke of the presser foot, and at this time the one-way transmission structure does not transmit power.

[0065] Among them, the one-way transmission structure includes a transmission boss 223 provided at the first axial end of the transmission sleeve and a transmission member provided at the second end of the driven pulley. The transmission boss 223 protrudes from a partial arc position at the first axial end of the transmission sleeve toward the first axial side. The transmission member can be a transmission pin 253. The transmission pin 253 and the transmission boss 223 correspond axially to the rotating shaft. Thus, within the first rotation angle of the driven pulley, the transmission sleeve is driven to rotate 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 a ring groove 252 is provided around the rotating shaft at the second end. 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 deviating from the rotating shaft. The end of the transmission pin 253 and the fixing hole can be fixed by 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 acts on the transmission boss 223 to drive the transmission sleeve 222 to rotate, and finally drives the lifting part 211 to lift. Within its second rotation angle, the transmission pin is at a rotation angle that avoids 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 rotate forward or backward. This angle is for adjusting the working stroke of the presser foot, and it 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 for distinguishing their functions. In addition, although the driven pulley also has the function of driving the rotating shaft to rotate within its first rotation angle, at this time the conjugate cam link mechanism 1 does not work, so the influence on the conjugate cam link mechanism 1 can be ignored. As long as the working stroke of the presser foot is adjusted in place before the conjugate cam link mechanism 1 works again.

[0068] The reason for integrating the conjugate link mechanism 1, the independent presser foot independent lifting mechanism 2, and the independent presser foot working stroke adjustment structure together is mainly due to the limitation of the internal space of the machine head. In this embodiment, the independent presser foot independent lifting mechanism 2 and the independent presser foot working stroke adjustment structure share a drive source, that is, the presser foot lifting motor 26 and the driven pulley 25. In addition, the conjugate cam link mechanism 1, the independent presser foot independent lifting mechanism 2, and the independent presser foot working stroke adjustment structure share the rotating shaft 24, and the corresponding functions are designed in sections, which can reduce parts, save space, and of course also reduce costs.

[0069] In the prior art, the independent presser foot driven by the main shaft has a fixed rotation angle of the main shaft, and the working stroke of the independent presser foot cannot be adjusted. The adaptability to embroidery of different thicknesses is poor, which affects the quality of the embroidery. Therefore, in some embodiments, an independent presser foot working stroke adjustment structure is also provided to achieve the adjustment of the working stroke of the presser foot. Specifically, the second conjugate connecting rod pin 243 is not independently arranged, but integrated with the rotating shaft 24, and is specifically arranged at the 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 of the second conjugate connecting rod pin (the relative position of the eccentric part in the circumference of the rotating shaft) is used to adjust the fulcrum position of the presser foot driving connecting rod 16, thereby adjusting 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, although the intermediate connecting rod 15 is also rotated to some positions, the entire conjugate cam connecting rod mechanism 1 does not work, and the conjugate connecting rod does not move.

[0070] Since the rotating shaft plays a role in the independent presser foot independent lifting mechanism 2 and the independent presser foot working stroke adjustment structure at the same time, a special design is made for the structure of the rotating shaft, 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 socket, the first shaft end 241 is inserted into the socket, and the end plate 251 is connected with a fixing screw 254 for fixing the first shaft end, so that the driven pulley is locked and fixed to the rotating shaft, and the fixing screw 254 can be a hexagon socket screw, or a handle can be provided to facilitate tightening. Or it can also be fixed in other ways. In this way, the first shaft end is fixed to the driven pulley, 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 staggered with the axial projections of the center points of the first shaft end 241 and the second shaft end 242, that is, eccentrically arranged. In addition, the second shaft end 242 is rotatably supported on a fulcrum, and the fulcrum is located on the head housing 4 .

[0071] Furthermore, the rotating shaft 24 is provided with 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 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 a bushing can be provided between the two to achieve smooth rotation and reduce noise and wear.

[0072] It is understandable that when the independent presser foot is adjusted for the working stroke, the independent presser foot will not be lifted at the same time. In addition, the transmission sleeve is provided with a circumferential limit groove 224 along the local circumference, and the rotating shaft is connected with a limit pin 225 at the corresponding axial position, and the limit pin 225 is limitedly matched with the circumferential limit groove 224.

[0073] Preferably, a bearing or a bushing is provided between the second conjugate connecting rod pin 243 and the pin hole of the presser foot driving connecting rod to achieve smooth rotation, reduce noise and wear. Further, a lubricating groove may be provided on the outer cylindrical surface of the second conjugate connecting rod pin, and lubricating grease is added.

[0074] The independent presser foot independent lifting mechanism 2 lifts the presser foot to the first height, where 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, an independent presser foot clutch mechanism 3 is also provided. After the independent presser foot independent 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 can also serve other functions, such as adjusting the working stroke of the presser foot.

[0075] Among them, the independent presser foot clutch mechanism 3 includes a presser foot positioning block 532 connected to the presser foot and synchronously lifted and lowered with the presser foot, 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 portion 314. The locking portion 314 locks with the presser foot positioning block 532 when the presser foot clutch plate 31 is in the second position and unlocks with 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 to or integrally provided with the presser foot driving block 53 and protrudes forward to facilitate cooperation with the locking portion 314.

[0076] Specifically, the presser foot clutch plate 31 is rotatably mounted on the needle bar holder 5 through a clutch pin 32, and the presser foot clutch plate 31 is driven to rotate by a clutch driving 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 (i.e., the above-mentioned first position) corresponding to the working state of the presser foot and a second angle (i.e., the above-mentioned second position) corresponding to the height of the non-working state of the presser foot. The locking portion 314 unlocks with the presser foot positioning block 532 when the clutch plate is in the first angle and locks with the presser foot positioning block 532 when the presser foot clutch plate is in the second angle.

[0077] Among them, the clutch driving component includes a clutch spring (not shown in the figure). The clutch spring makes the presser foot clutch plate have a tendency to rotate from the second angle to the first angle, that is, if there is no other external force blocking, the clutch spring will make the presser foot clutch plate rotate to the first angle to unlock with the presser foot positioning block. Specifically, the clutch spring is a clutch torsion spring, and the clutch torsion spring is mounted on the clutch pin and connected to the presser foot clutch plate.

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

[0079] Specifically, the presser foot clutch plate 31 includes a vertical section 311 and an inclined section 312 extending obliquely upward from the top end of the vertical section to one side thereof. The inclined section is connected to the clutch pin 32. Among them, the bottom end of the inclined section extends to the other side of the vertical section and forms a rotation stopping portion 313. A side concave portion 315 is provided on one side of the lower part of the vertical section. The locking portion 314 is arranged at the bottom side of the side concave portion. The above design of the presser foot clutch plate 31 is to minimize the space occupied in the transverse direction because the distance between two adjacent needle bars is small. Taking the design of the inclined section 312 as an example, it not only forms the rotation stopping portion 313, but also for two adjacent presser foot clutch plates 31, the top of the inclined section of one extends above the bottom of the inclined section of the other.

[0080] In this way, when the presser foot does not work, the top pin 551 pushes up against the rotation stopping portion 313 to keep the presser foot clutch plate in an approximately vertical state (the second angle). At the same time, the presser foot positioning block 532 is locked by the locking portion 314 and cannot descend. When the presser foot works, the presser foot clutch plate 31 deflects a certain angle under the elastic force of the clutch spring to the first angle, so that the locking portion 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 this embodiment refers to a component with a function similar to that of a connecting rod, but its shape is not limited to a rod-like structure. Bearings or bushings can be provided between the connecting rod and the connecting rod pin.

[0082] The above is only the specific embodiment of the invention, but the protection scope of the invention is not limited thereto. Those skilled in the art should understand that the invention includes but is not limited to the content described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the invention will be included in the scope of the claims.

Claims

1. A conjugate cam-link mechanism for driving a presser foot to move up and down, characterized in that The conjugate cam-connecting rod mechanism includes a conjugate cam installed on the main shaft and a conjugate connecting rod assembly driven by the conjugate cam, wherein 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, wherein 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.

2. The conjugate cam-link mechanism according to claim 1, characterized in that, The conjugate link assembly also includes a conjugate link, which is rotatably connected to a first conjugate link pin. The first conjugate link pin is disposed below the main shaft, and the first transmission part and the second transmission part are disposed on the conjugate link.

3. The conjugate cam-link mechanism according to claim 2, characterized in that, The conjugate link is fixed together by a conjugate link A and a conjugate link B, the first transmission part is arranged on the conjugate link A, the second transmission part is arranged on the conjugate link B, the conjugate link A is provided with an inner sleeve which is externally mounted on the conjugate link pin, and the conjugate link B is provided with an adjustment hoop which is clamped and fixed by the inner sleeve.

4. The conjugate cam-link mechanism according to claim 3, wherein, The conjugate connecting rod assembly also includes a presser foot driving connecting rod rotatably connected to the second conjugate connecting rod pin, and the third transmission part is arranged at the second end of the presser foot driving connecting rod.

5. The conjugate cam link mechanism according to claim 4, characterized in that, 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 driven to rise. When the presser foot driving connecting rod is lowered, the presser foot is lowered under the action of the presser foot spring.

6. The conjugate cam link mechanism according to claim 4, characterized in that, The conjugate connecting rod assembly also includes an intermediate connecting rod, and two ends of the intermediate connecting rod are respectively connected to the conjugate connecting rod and the first end of the presser foot driving connecting rod.

7. The conjugate cam-link mechanism according to claim 6, characterized in that, 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 connection point with the intermediate connecting rod are respectively arranged on the three corners of the triangle.

8. The conjugate cam link mechanism according to claim 4, characterized in that, 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 according to claim 4, characterized in that The presser foot driving connecting rod is a V-shaped connecting rod.

10. Embroidery machine, including an independent presser foot drive device, characterized in that, The independent presser foot driving device is provided with a conjugate cam-linkage mechanism as described in any one of claims 1 to 9.

Images