Independent presser foot independent lifting and clutch structure and embroidery machine

Abstract

The invention discloses an independent presser foot independent lifting and clutching structure and an embroidery machine, and relates to the embroidery machine technology, the independent presser foot independent lifting and clutching structure comprises an independent presser foot independent lifting mechanism and an independent presser foot clutching mechanism, the independent presser foot independent lifting mechanism is used for lifting a presser foot to a first height, and the independent presser foot clutching mechanism is used for clutching the presser foot. The first height is higher than the highest point of the working stroke of the presser foot, and the independent presser foot lifting mechanism comprises a presser foot lifting motor and a presser foot lifting component driven by the presser foot lifting motor; the independent presser foot clutch mechanism comprises a presser foot positioning block which is connected with the presser foot and ascends and descends synchronously with the presser foot, and a presser foot clutch disc which is rotationally installed through a clutch pin, and the presser foot clutch disc has a first position corresponding to the working state of the presser foot and has a second position corresponding to the non-working state of the presser foot. The presser foot can be lifted to the non-working height, and after the presser foot is lifted to the non-working height, the presser foot can be kept at the non-working height.

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] Referring to the Chinese patent application for invention with publication number CN117802708A, 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 and the outer cam surface of the first cam are in rolling cooperation so that the presser foot driving block drives the independent presser foot to complete the upward stroke, and the second roller and the outer cam surface of the second cam are in rolling cooperation so that the presser foot driving block drives the independent presser foot to complete the downward stroke.

[0004] 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 cloth. If an independent lifting mechanism for the independent presser foot is designed, the presser foot can be lifted to a non-working height, but the driving source of the independent lifting mechanism for the independent presser foot has other functions and cannot always maintain a working state, and cannot keep the presser foot at a non-working height all the time.

Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an independent lifting and clutch structure for an independent presser foot and an embroidery machine, which can lift the presser foot to a non-working height and can keep the presser foot at the non-working height after lifting the presser foot to the non-working height.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] First, an independent presser foot independent lifting and clutch structure is provided, including an independent presser foot independent lifting mechanism and an independent presser foot clutch mechanism. The independent presser foot independent lifting mechanism is used to lift the presser foot to a first height, which is higher than the highest point of the working stroke of the presser foot. The independent presser foot independent lifting mechanism includes a presser foot lifting motor and a presser foot lifting component driven by the presser foot lifting motor. The presser foot lifting component is provided with a lifting part that supports under the presser foot driving block during the lifting process, and the lifting part has an avoidance state of leaving under the presser foot driving block during the working process of the presser foot.

[0008] The independent presser foot clutch mechanism includes a presser foot positioning block connected to the presser foot and synchronously lifted and lowered with the presser foot, and a presser foot clutch plate rotatably installed through a clutch pin. The presser foot clutch plate 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 has a locking part, and the locking part locks with the presser foot positioning block when the presser foot clutch plate is in the second position and unlocks with the presser foot positioning block when the presser foot clutch plate is in the first position.

[0009] Preferably, the presser foot lifting component includes a presser foot lifting link and a guide member, and the presser foot lifting link moves along the guide member.

[0010] Preferably, the presser foot lifting link includes a first presser foot lifting link and a second presser foot lifting link. The lifting part is provided at the first end of the first presser foot lifting link. The second end of the first presser foot lifting link is hinged to the first end of the second presser foot lifting link, and the first presser foot lifting link is provided with a guiding part that is guidingly matched with the guide member.

[0011] Preferably, the guide member is provided with a vertically extending guide groove, and the guiding part rises and falls along the guide groove; and / or, the guiding part is provided with guiding rollers.

[0012] Preferably, the second end of the second presser foot lifting link is provided with a transmission sleeve, the transmission sleeve is rotatably supported on a rotating shaft, and a transmission structure is provided between the transmission sleeve and the presser foot lifting motor.

[0013] Preferably, the presser foot clutch plate is rotatably installed through a clutch pin. The presser foot clutch plate has a first angle corresponding to the first position and a second angle corresponding to the second position, and the presser foot clutch plate is driven to rotate by a clutch driving component.

[0014] Preferably, the clutch driving component includes a clutch spring, and the clutch spring makes the presser foot clutch plate have a tendency to rotate from the second angle to the first angle.

[0015] Preferably, the clutch driving component includes a lower dead center of the needle bar. The presser foot clutch plate has a rotation stopping part, and the lower dead center of the needle bar cooperates with the rotation stopping part to make the presser foot clutch plate in the second angle.

[0016] Preferably, the presser foot clutch plate includes a vertical section and an inclined section extending obliquely upward from the top end of the vertical section to one side thereof. The inclined section is connected to the clutch pin. The bottom end of the inclined section extends to the other side of the vertical section and forms a rotation stopping portion. A side concave portion is provided on one side of the lower part of the vertical section, and the locking portion is provided on the bottom side of the side concave portion.

[0017] In addition, the present invention also provides an embroidery machine, including an independent presser foot driving device, and the independent presser foot driving device is provided with the independent presser foot independent lifting and clutch structure as described above.

[0018] The present invention adopts the above technical solutions and has the following technical effects:

[0019] In addition to the original independent presser foot driving device, the present invention independently provides an independent presser foot independent lifting mechanism. The independent presser foot independent lifting mechanism includes a presser foot lifting motor and a presser foot lifting component driven by the presser foot lifting motor. The presser foot lifting component is provided with a lifting portion that supports under the presser foot driving block during the lifting process to lift the presser foot to a position higher than the highest point of the presser foot working stroke, so as to avoid the risk of the presser foot interfering with the embroidery cloth during color change and when the presser foot is in a non-working state; the lifting portion has an avoidance state of leaving under the presser foot driving block during the working process of the presser foot, so as not to affect the normal working of the presser foot.

[0020] The independent presser foot clutch mechanism includes a presser foot positioning block connected to the presser foot and synchronously lifted and lowered with the presser foot, and a presser foot clutch plate that can move relative to the presser foot positioning block when driven. The presser foot clutch plate 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 has a locking portion. The locking portion locks with the presser foot positioning block when the presser foot clutch plate is in the second position, and unlocks from the presser foot positioning block when the presser foot clutch plate is in the first position. In this way, after the independent presser foot independent lifting mechanism lifts the presser foot to a non-working height, the locking portion locks with the presser foot positioning block when the presser foot clutch plate is in the second position, so that the presser foot can be kept at the non-working height, and during the working process of the presser foot, the presser foot clutch plate unlocks from the presser foot positioning block when in the first position, releasing the action on the presser foot.

[0021] These features and advantages of the present invention will be detailedly disclosed in the following specific embodiments and drawings.

Description of the Drawings

[0022] The following further describes the invention with reference to the drawings:

[0023] Figure 1 It is a schematic diagram of the head structure of the embroidery machine in the present invention;

[0024] Figure 2 It is a side view of the head of the embroidery machine in the present invention (the head housing is not shown);

[0025] Figure 3 It is a schematic structural diagram of the conjugate cam link mechanism in the present invention;

[0026] 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;

[0027] 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;

[0028] 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;

[0029] 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;

[0030] Figure 8 is Figure 7 a partial structural schematic diagram in;

[0031] 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 in the present invention when the independent presser foot is lifted to the first height state by the independent presser foot independent lifting mechanism;

[0032] Figure 10 It is a schematic structural diagram of the independent presser foot independent lifting mechanism in the present invention when the independent presser foot is in a non - acting state;

[0033] Figure 11 is Figure 10 a partial structural schematic diagram in;

[0034] 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 in the present invention when the independent presser foot is in a non - acting state by the independent presser foot independent lifting mechanism;

[0035] 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 in the present invention when the independent presser foot is in a non - acting state by the independent presser foot independent lifting mechanism;

[0036] Figure 14 It is a schematic structural diagram of the independent presser foot clutch mechanism in the present invention;

[0037] Figure 15 It is a schematic structural diagram of the independent presser foot clutch mechanism in the present invention;

[0038] Reference numerals: conjugate cam-link mechanism 1, conjugate cam 11, inner cam surface 111, outer cam surface 112, conjugate link B12, first roller 121, conjugate link A13, second roller 131, inner sleeve 132, first conjugate link pin 14, intermediate link 15, presser foot drive link 16, third roller 161; independent presser foot independent lifting mechanism 2, first presser foot lifting link 21, lifting portion 211, guide roller 212, articulated groove 213, second presser foot lifting link 22, link portion 221, drive sleeve 222, drive 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, drive pin 253, fixing screw 254, presser foot lifting motor 26, independent presser foot clutch mechanism 3, presser foot clutch plate 31, vertical section 311, oblique section 312, anti-rotation 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

[0039] 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, 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.

[0040] 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.

[0041] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the terms such as "upper", "lower", "front", "rear", "lateral" and the like indicating orientation or positional relationship are only based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present 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 cannot be understood as a limitation to the present invention.

[0042] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means 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 that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0044] In addition, terms such as "first" and "second" 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, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0045] As Figures 1 to 15 As shown, 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.

[0046] Among them, a needle bar 51 is installed on the needle bar holder 5. The needle bar is provided with a lower stop point 55 of the needle bar. A sewing 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.

[0047] As Figure 3 shown, in this embodiment, the independent presser foot driving device is provided with a conjugate cam-linkage mechanism 1. The conjugate cam-linkage 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. Moreover, 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.

[0048] 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 arranged below the main shaft. The first transmission part and the second transmission part are arranged on the conjugate link. The first conjugate link pin 14 is installed on the machine head housing 4.

[0049] For the above conjugate cam-linkage 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 upward 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 downward stroke, or vice versa. Compared with the prior art, only one conjugate cam needs to be provided, solving the problem of increased axial space caused by setting the first cam and the second cam simultaneously in the prior art.

[0050] 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 an integral body. In addition, a bearing is provided between the inner sleeve 132 and the first conjugate link pin 14. The reason for separately arranging 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 related 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.

[0051] 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.

[0052] Further, the conjugate link assembly further includes a presser foot drive 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 drive link.

[0053] In this embodiment, the third transmission part is arranged below the presser foot drive block 53, and the third transmission part is provided with a third roller 161. The presser foot drive block 53 is provided with a presser foot drive part 531 protruding upward above the third roller 161, and the bottom surface of the presser foot drive part 531 cooperates with the third roller 161. When the third roller 161 on the presser foot drive link 16 is lifted upward, it drives the presser foot drive block 53 to rise. When the third roller 161 on the presser foot drive link 16 descends, since the presser foot drive link 16 no longer acts on the presser foot drive 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 drive link 16 can be connected with a return torsion spring to ensure better reset.

[0054] Further, 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 drive link 16.

[0055] 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 triangle of the 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. Moreover, in the horizontal projection, the conjugate link B12, the intermediate link 15, and the presser foot drive 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.

[0056] In some of these embodiments, the presser foot drive 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, the first side is connected to the intermediate link 15, and the third transmission part is located on the second side. Since the presser foot drive link 16 rotates perpendicular to the horizontal plane, being designed as a V-shaped link can save space in the front-back direction.

[0057] 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 to press 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.

[0058] In the prior art, the independent presser foot drive 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, that is, the non-working height.

[0059] 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 this independent lifting here is to separate from the original independent presser foot drive device in the prior art and completely independently set up an independent presser foot independent lifting mechanism.

[0060] 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 portion 211 that is supported below the presser foot driving block 53 during the lifting process. The lifting portion 211 has an avoidance state of leaving below 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 portion 211 is not directly connected to the presser foot driving block, but is movably supported below the presser foot driving block. In this way, it directly acts on the presser foot driving block during lifting, and can be separated from the presser foot driving block when not lifting, avoiding the area below the presser foot driving block.

[0061] Similar to the third roller 161, the lifting portion 211 also acts on the bottom surface of the presser foot driving portion 531. It can be understood that since both the lifting portion 211 and the third roller 161 are below the presser foot driving block and both move up and down, in order to avoid mutual influence and achieve the independent function of the independent presser foot independent lifting mechanism 2, the lifting portion 211 and the third roller 161 are staggered horizontally. The lifting portion 211 can also be provided with a lifting roller. Here, the lifting portion is provided with an arc surface that acts on the bottom surface of the presser foot driving portion 531.

[0062] In some embodiments, the presser foot lifting component 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 in guiding cooperation with the guide member 23, and the presser foot lifting motor 26 drives the second presser foot lifting link 22 to rotate. Specifically, the guide member 23 is provided with a guiding groove 231 extending vertically, and the guiding portion moves up and down along the guiding groove. Preferably, the guiding portion is provided with a guiding roller 212, and the guiding roller 212 is in rolling cooperation with the guiding 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 guiding roller 212 is driven to move up and down in the guiding groove 231.

[0063] Specifically, the second end of the first presser foot lifting link 21 is provided with a hinge groove 213. The hinge groove 213 is of 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 lateral projections of the lifting part 211, the guiding part (guiding roller 212), and the hinge groove 213 are respectively located at the three vertex positions of a triangle, and the lifting part and the guiding part are correspondingly arranged on the lateral two sides of the hinge groove. The lifting part extends obliquely upward under the presser foot driving block, and the guiding part also extends obliquely upward, but in a direction opposite to the oblique extension direction of the lifting part. An acute angle is formed between the two, and at the same time, the guiding part and the lifting part are also avoided in the front-rear direction, so that the guiding roller 212 can rise and fall along the guiding groove. The lifting part and the guiding part are correspondingly arranged on the lateral two sides of the hinge groove to avoid interference between the two in the lateral space.

[0064] Specifically, the second presser foot lifting link 22 is provided with a link part 221. The link part 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 axis of the transmission sleeve 222 is vertically connected to the second end of the link part 221. The transmission sleeve 222 extends to one side of the second end of the link part 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 component 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 component, and the rotation of the second presser foot lifting link can be realized. Among them, the transmission component 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.

[0065] 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.

[0066] In this embodiment, a synchronous belt assembly is provided between the presser foot lifting motor 26 and the presser foot lifting component. The synchronous belt assembly includes a driving 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., so that the above-mentioned rotating element can be a gear, a sprocket, etc.

[0067] As described below, since the driven 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 rotation of the rotating shaft 24 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 prevent the independent presser foot independent lifting mechanism from working. Therefore, in order to prevent the transmission sleeve 222 from rotating when the driven pulley 25 drives the rotating shaft 24 to rotate. Therefore, a one-way transmission structure between the driven pulley 25 and the transmission sleeve 222 is specifically designed. The driven pulley 25 has a first rotation angle and a second rotation angle. Within the first rotation angle of the driven 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 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.

[0068] 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 are corresponding in the axial direction of 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, 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, and a fixing hole is provided at a position where the end plate 251 deviates from the rotating shaft in the radial direction. 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.

[0069] 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 the second rotation angle of the driven pulley, the transmission pin is located at a rotation angle that avoids the transmission boss, and the transmission pin does not act on the transmission boss. 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 either increase or decrease the working stroke of the presser foot.

[0070] It can be understood that the "first rotation angle" and "second rotation angle" of the driven pulley 25 are only for distinguishing the functions they play. Additionally, although the driven pulley also has the function of driving the rotating shaft to rotate at its first rotation angle, the conjugate cam-link mechanism 1 does not work at this time. Therefore, 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.

[0071] The reason for integrating the conjugate link mechanism 1 with the independent presser foot independent lifting mechanism 2 and the independent presser foot working stroke adjustment structure is mainly due to the limitation of the space inside 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 driving source, namely the presser foot lifting motor 26 and the driven pulley 25. Additionally, the conjugate 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 components, save space, and of course also reduce costs.

[0072] In the prior art, for the independent presser foot driven by the main shaft, since the rotation angle of the main shaft is fixed, the working stroke of the independent presser foot cannot be adjusted, and its adaptability to embroideries of different thicknesses is poor, affecting the quality of the embroideries. Therefore, in some embodiments, an independent presser foot working stroke adjustment structure is also provided to realize the adjustment of the working stroke of the presser foot. Specifically, the above-mentioned second conjugate link pin 243 is not independently arranged, 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 link pin 243 to rotate, and the eccentric angle of the second conjugate link pin (the relative position of the eccentric part in the circumferential direction of the rotating shaft) is used to adjust the fulcrum position of the presser foot driving link 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 link pin 243 maintains the adjusted eccentric angle. During the rotation of the second conjugate link pin, although the intermediate link 15 will also rotate to some positions, the entire conjugate cam-link mechanism 1 does not work, and the conjugate link will not move.

[0073] Since the rotating shaft plays a role in both the independent presser foot independent lifting mechanism 2 and the independent presser foot working stroke adjustment structure, 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 .

[0074] 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.

[0075] 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.

[0076] 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 and reduce noise and wear. Furthermore, the outer cylindrical surface of the second conjugate connecting rod pin can also be provided with a lubrication groove and lubricating grease can be added.

[0077] The independent presser foot lifting mechanism 2 lifts the presser foot to a first height, wherein the presser foot lifting motor 26 serves as a driving source and also plays other roles. Figures 4 to 15 As shown, in some embodiments, in order to keep the presser foot at a non-working height, an independent presser foot clutch mechanism 3 is further provided, and after the independent presser foot independent lifting mechanism 2 lifts the presser foot to a 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 play other roles, such as adjusting the working stroke of the presser foot.

[0078] 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 from the presser foot positioning block 532 when the presser foot clutch plate 31 is in the first position. The presser foot positioning block 532 is detachably 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.

[0079] 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 lock and unlock 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 non-working state height of the presser foot. The locking portion 314 unlocks from 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 clutch plate is in the second angle.

[0080] Among them, the clutch driving component includes a clutch spring (not shown in the figure). The clutch spring makes the presser foot clutch plate tend to rotate from the second angle to the first angle. That is, if there is no other external force to block, the clutch spring will make the presser foot clutch plate rotate to the first angle and unlock from the presser foot positioning block. Specifically, the clutch spring is a clutch torsion spring. The clutch torsion spring is mounted on the clutch pin and connected to the presser foot clutch plate.

[0081] Furthermore, 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 the second angle. Specifically, a top pin 551 is provided at the lower dead center 55 of the needle bar. When the top pin 551 rises, it 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 locks with the presser foot positioning block 532. That is, by means of the rising of the needle bar, the locking between the locking portion and the presser foot positioning block is achieved.

[0082] 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 prevention portion 313. A side concave portion 315 is provided on one side of the lower part of the vertical section, and the locking portion 314 is provided on 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 horizontal direction because the distance between adjacent two needle bars is small. Taking the design of the inclined section 312 as an example, the rotation prevention portion 313 is formed, and at the same time, 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.

[0083] In this way, when the presser foot is not working, the top pin 551 pushes upward against the rotation prevention 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 is working, the presser foot clutch plate 31 deflects by 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.

[0084] 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-shaped structure. Bearings or bushings can be provided between the connecting rod and the connecting rod pin.

[0085] As described above, the above is only a 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. Independent presser foot independent lifting and clutch structure, characterized in that, It includes an independent presser foot independent lifting mechanism and an independent presser foot clutch mechanism. The independent presser foot independent lifting mechanism is used to lift the presser foot to a first height, and the first height is higher than the highest point of the working stroke of the presser foot. The independent presser foot independent lifting mechanism includes a presser foot lifting motor and a presser foot lifting component driven by the presser foot lifting motor. The presser foot lifting component is provided with a lifting part that supports under the presser foot driving block during the lifting process, and the lifting part has an avoidance state of leaving under the presser foot driving block during the working process of the presser foot. The independent presser foot clutch mechanism includes a presser foot positioning block connected to the presser foot and synchronously lifted with the presser foot, and a presser foot clutch plate rotatably installed through a clutch pin. The presser foot clutch plate 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 has a locking part, and the locking part locks with the presser foot positioning block when the presser foot clutch plate is in the second position and unlocks with the presser foot positioning block when the presser foot clutch plate is in the first position.

2. The independent presser foot independent lifting and clutch structure according to claim 1, characterized in that The presser foot lifting component includes a presser foot lifting link and a guide member, and the presser foot lifting link moves along the guide member.

3. The independent presser foot independent lifting and clutch structure according to claim 2, characterized in that, The presser foot lifting link includes a first presser foot lifting link and a second presser foot lifting link. The lifting part is arranged at the first end of the first presser foot lifting link. The second end of the first presser foot lifting link is hinged to the first end of the second presser foot lifting link, and the first presser foot lifting link is provided with a guiding part that is guidingly matched with the guide member.

4. The independent presser foot independent lifting and clutch structure according to claim 3, characterized in that, The guide member is provided with a guide groove extending vertically, and the guiding part rises and falls along the guide groove; and / or, the guiding part is provided with a guiding roller.

5. The independent presser foot independent lifting and clutch structure according to claim 3, wherein, The second end of the second presser foot lifting link is provided with a transmission sleeve, the transmission sleeve is rotatably supported on a rotating shaft, and a transmission structure is arranged between the transmission sleeve and the presser foot lifting motor.

6. The independent lifting and clutch structure of the vertical presser foot according to claim 1, characterized in that, The presser foot clutch plate is rotatably installed through a clutch pin. The presser foot clutch plate has a first angle corresponding to the first position and a second angle corresponding to the second position, and the presser foot clutch plate is driven to rotate by a clutch driving component.

7. The independent lifting and clutch structure of the vertical presser foot according to claim 6, characterized in that The clutch driving component includes a clutch spring, and the clutch spring makes the presser foot clutch plate have a tendency to rotate from the second angle to the first angle.

8. The independent lifting and clutch structure of the vertical presser foot according to claim 7, characterized in that The clutch driving component includes a lower dead center of the needle bar. The presser foot clutch plate has a rotation stopping part, and the lower dead center of the needle bar cooperates with the rotation stopping part to make the presser foot clutch plate in the second angle.

9. The independent lifting and clutch structure of the vertical presser foot according to claim 8, characterized in that, The presser foot clutch plate includes a vertical section and an inclined section obliquely extending upward from the top end of the vertical section to one side. The inclined section is connected to the clutch pin. The bottom end of the inclined section extends to the other side of the vertical section and forms a rotation stopping part. A side concave part is arranged on one side of the lower part of the vertical section, and the locking part is arranged at the bottom side of the side concave part.

10. Embroidery machine, including an independent presser foot drive device, characterized in that, The independent presser foot driving device is provided with the independent presser foot independent lifting and clutch structure according to any one of claims 1 to 9.

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