Conjugate cam embroidery machine head and embroidery machine

Abstract

The invention discloses a conjugate cam embroidery machine head and an embroidery machine, relates to an embroidery technology, solves the problems that a needle bar is pressed down to combine the needle bar with a needle bar driver and a presser foot is matched with a presser foot driver, reduces axial space, and can reduce noise when the presser foot works. The conjugate cam embroidery machine head comprises a needle pressing rod structure and a conjugate cam presser foot driving device, the needle pressing rod structure comprises a needle rod, a driving shaft, a needle pressing rod motor and a pressing rod, a needle rod driver is movably mounted on the driving shaft, a lower dead center is fixed on the needle rod, and the needle pressing rod motor drives the pressing rod to enable the pressing rod to press down the needle rod. Therefore, the needle bar driver corresponds to the lower dead center in height position, is movably connected with the lower dead center and drives the needle bar through the lower dead center. The conjugate cam presser foot driving device comprises a conjugate cam installed on the main shaft and a conjugate connecting rod assembly driven by the conjugate cam, and the conjugate cam is provided with an inner cam face and an outer cam face.

Description

Technical field

[0001] The invention belongs to the technical field of embroidery equipment, and in particular relates to an embroidery machine. [Background Technology]

[0002] In the field of embroidery machine technology, there are two types of presser foot drives: one is integrated with the needle bar movement, where the needle bar drives the presser foot to move back and forth; the other is an independent presser foot, driven by an independent power source, which does not interfere with the reciprocating movement of the presser foot and the needle bar. The use of independent presser feet is becoming increasingly common.

[0003] Referring to Chinese invention patent application CN117802706 A, a differential speed coupling device for a presser foot is disclosed, comprising a main shaft, first and second cams disposed on the main shaft, a needle bar, a presser foot slidably coupled to the needle bar, a first transmission member having a first pivot point, and a presser foot drive block capable of lifting and lowering. The transmission member and the presser foot drive block are directly or indirectly movably connected. The transmission member comprises a first roller and a second roller. The first roller and the outer cam surface of the first cam engage in rolling engagement, enabling the presser foot drive block to engage with the presser foot's upward stroke, while the second roller and the outer cam surface of the second cam engage in rolling engagement, enabling the presser foot drive block to engage with the presser foot's downward stroke. Because both the first and second cams must be provided on the main shaft to independently control the presser foot's upward and downward strokes, the axial space of the embroidery machine head increases. Furthermore, the second transmission position does not always maintain contact with the presser foot positioning block during the presser foot's operating stroke, resulting in an impact each time the two contact, increasing noise.

[0004] In addition, in the prior art, the needle bar is provided with a top dead point above the bottom dead point. The needle bar is stopped at the highest position of the up and down movement of the needle bar driver and the presser foot driver by cooperating with the middle beam on the upper needle bar frame, so that the bottom dead point can be coupled with the needle bar driver. However, when the top dead point is limited during operation, it will collide with the middle beam of the needle bar frame, generating noise. In order to avoid this noise, the applicant intends to cancel the top dead point. The bottom dead point and the needle bar driver are always coupled during operation. The maximum working stroke of the needle bar driver ensures that the bottom dead point will not collide with the needle bar frame, thereby reducing noise during operation. However, this also means that before the needle bar and presser foot work, it is necessary to use a needle bar pressing structure to press the needle bar down so that the bottom dead point can be coupled with the needle bar driver, and the presser foot can cooperate with the presser foot driver. [Summary of the invention]

[0005] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a conjugate cam presser foot drive device and an embroidery machine, which solves the problem of pressing down the needle bar to combine the needle bar with the needle bar driver, and the problem of coordinating the presser foot with the presser foot driver, while reducing the axial space and reducing the noise when the presser foot is working.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] First, a conjugate cam embroidery machine head is provided, including a needle presser bar structure and a conjugate cam presser foot driving device, the needle presser bar structure including a needle bar, a driving shaft, a needle presser bar motor and a pressure bar, the drive shaft is movably mounted with a needle bar driver, a bottom dead center is fixed on the needle bar, the needle presser bar motor drives the pressure bar so that the pressure bar presses the needle bar down, so that the needle bar driver and the bottom dead center are at corresponding heights, the needle bar driver is movably connected to the bottom dead center, and drives the needle bar through the bottom dead center;

[0008] The conjugate cam presser foot driving device includes a conjugate cam installed on the main shaft and a conjugate connecting rod assembly driven by the conjugate cam, the conjugate cam is provided with an inner cam surface and an outer cam surface; the conjugate connecting rod assembly includes a conjugate connecting rod rotatably connected to the first conjugate connecting rod pin and a presser foot driving connecting rod rotatably connected to the second conjugate connecting rod pin, the conjugate connecting rod is provided with a first transmission part and a second transmission part, and the presser foot driving connecting rod is provided with a presser foot driving part; the first transmission part cooperates with the inner cam surface, and the second transmission part cooperates with the outer cam surface, so that the conjugate cam drives the conjugate connecting rod to rotate through the first transmission part and the second transmission part, and the presser foot driving connecting rod is driven to rotate by the conjugate connecting rod, the presser foot driving part is arranged below the presser foot positioning block, the presser foot positioning block is connected to the presser foot, and after the needle bar structure presses the needle bar down, the presser foot driving part abuts against the bottom surface of the presser foot positioning block, and the presser foot driving connecting rod is synchronized with the lifting and lowering of the presser foot when driving the presser foot to work, so that the presser foot driving part always keeps in contact with the bottom surface of the presser foot positioning block.

[0009] Preferably, the conjugate link includes a first link segment and a second link segment, the first ends of the first link segment and the second link segment are rotatably connected to the first conjugate link pin, and a link angle is formed between the first ends of the first link segment and the second link segment.

[0010] Preferably, the second ends of the first connecting rod segment and the second connecting rod segment are connected through a connecting segment, and a connecting rod adjustment structure is provided between the connecting segment and the second end of the first connecting rod segment and / or the second connecting rod segment, and the connecting rod angle is adjusted by the connecting rod adjustment structure.

[0011] Preferably, the first transmission part is provided with a first roller, and the second transmission part is provided with a second roller, the first roller cooperates with the inner cam surface, and the second roller cooperates with the outer cam surface.

[0012] Preferably, the presser foot positioning block is movably connected to the needle bar, the lower dead point is located above the presser foot positioning block, and a presser foot spring is movably connected to the needle bar. The upper end of the presser foot spring abuts the lower dead point and the lower end abuts the presser foot positioning block, and the presser foot spring is always compressed during the presser foot working stroke.

[0013] Preferably, the conjugate connecting rod assembly also includes an intermediate connecting rod, the two ends of which are respectively connected to the conjugate connecting rod and the first end of the presser foot driving connecting rod; and / or, the presser foot driving connecting rod is a V-shaped connecting rod, and the presser foot driving part is arranged at the second end of the presser foot driving connecting rod.

[0014] Preferably, the pressure rod is rotatably installed above the needle bar, and the pressure rod is provided with a pressing section on the first side of the rotating fulcrum for pressing down the needle bar; the output shaft of the needle bar pressing motor is connected to a cam, and the pressure rod is provided with a lifting section on the second side of the rotating fulcrum, and the cam cooperates with the lifting section when the needle bar is pressed down, and is used to drive the lifting section to lift upward.

[0015] Preferably, there is an angle between the pressing down section and the lifting section; and / or, a lower extension section extending downward is provided at the connection portion between the pressing down section and the lifting section, and the lower extension section is connected to the fulcrum shaft.

[0016] Preferably, the pressure rod is connected to a first torsion spring for achieving the upward movement of the downward pressure section.

[0017] In addition, the present invention also provides an embroidery machine, comprising the conjugate cam embroidery machine head.

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

[0019] The conjugate cam presser foot driving device of the present invention comprises a conjugate cam installed on a 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 comprises a conjugate connecting rod rotatably connected to a first conjugate connecting rod pin, and a presser foot driving connecting rod rotatably connected to a second conjugate connecting rod pin, the conjugate connecting rod is provided with a first transmission part and a second transmission part, and the presser foot driving connecting rod is provided with a presser foot driving part; the first transmission part cooperates with the inner cam surface, and the second transmission part cooperates with the outer cam surface, so that the conjugate cam drives the conjugate connecting rod to rotate through the first transmission part and the second transmission part, and the presser foot driving connecting rod is driven to rotate by the conjugate connecting rod, and the presser foot driving part is arranged below the presser foot positioning block, and the presser foot positioning block is connected to the presser foot, and the presser foot driving connecting rod is synchronized with the lifting and lowering of the presser foot when driving the presser foot to work, so that the presser foot driving part always keeps contact with the bottom surface of the presser foot positioning block. On the one hand, compared with the existing technology, only one conjugate cam is required to solve the problem of increased axial space caused by the simultaneous setting of the first cam and the second cam in the existing technology; on the other hand, since the presser foot driving part always keeps in contact with the bottom surface of the presser foot positioning block when the presser foot is working, the noise generated by the collision between the two is avoided, and it is also beneficial to increase the maximum operating speed of the main shaft.

[0020] In addition, a needle bar structure is provided, which includes a needle bar motor and a pressure bar. The needle bar motor drives the pressure bar, causing the pressure bar to press the needle bar down, thereby causing the needle bar driver to correspond in height to the bottom dead center. In this way, before the needle bar and presser foot work, the needle bar structure works. After the needle bar structure presses the needle bar down, the needle bar driver engages with the bottom dead center through the clutch structure. At the same time, the bottom surface of the presser foot positioning block abuts against the presser foot driving part, and the needle bar structure resets. Subsequently, the needle bar driver and the conjugate cam presser foot driving device drive the needle bar and presser foot to work accordingly.

[0021] 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

[0022] The invention will be further described below with reference to the accompanying drawings:

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

[0024] Figure 2 Schematic diagram of the structure of the embroidery machine head of the present invention (the head housing is not shown);

[0025] Figure 3 It is a structural schematic diagram of the conjugate cam presser foot driving device of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the conjugate cam presser foot driving device of the present invention;

[0027] Figure 5 This is a schematic diagram of the medium-pressure needle rod structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the medium-pressure needle rod structure of the present invention;

[0029] Figure 1: Conjugate cam presser foot driving device 1, conjugate cam 11, inner cam surface 111, outer cam surface 112, conjugate connecting rod 12, first connecting rod section 121, second connecting rod section 122, connecting section 123, protruding section 124, first roller 125, second roller 126, clamping hoop structure 127, locking screw 128, first conjugate connecting rod pin 13, second roller 131, inner sleeve 132, second conjugate connecting rod pin 14, intermediate connecting rod 15, presser foot driving connecting rod 16, third roller 161; presser rod structure 2, presser rod 2 1. Pressing section 211, lifting section 212, lower extension section 213, motor support 22, bottom plate 221, vertical plate 222, cam 23, second torsion spring 24, needle bar motor 25, first torsion spring 26, fulcrum shaft 27; transverse slide rail mechanism 3, machine head housing 4, needle bar frame 5, bottom beam 501, middle beam 502, needle bar 51, embroidery needle 511, presser foot 52, presser foot part 521, presser foot positioning block 53, presser foot positioning part 531, presser foot spring 54, bottom dead center 55, needle bar spring 56, drive shaft 6, needle bar driver 7. [Specific implementation method]

[0030] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0031] Those skilled in the art will appreciate that, unless there is any conflict, the features in the following embodiments and implementations may be combined with each other.

[0032] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. For example, terms such as "upper," "lower," "front," "back," and "lateral" that indicate orientation or positional relationships are based solely on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the disclosure. They do not indicate or imply that the device or element referred to must have a specific orientation or be constructed or operated in a specific orientation, and therefore should not be construed as limiting the disclosure.

[0033] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0036] like Figures 1 to 6 As shown, the embroidery machine is provided with at least one machine head, which includes a machine head housing 4 and a needle bar frame 5 provided on the front side of the machine head housing. A transverse slide mechanism 3 is provided between the needle bar frame 5 and the machine head housing 4. In this embodiment, the relative direction between the needle bar frame 5 and the machine head housing 4 is defined as the front-to-back direction, and the movable direction of the needle bar frame 5 is defined as the transverse direction, or also referred to as the left-right direction. The embroidery machine is provided with a main shaft extending laterally and passing through each machine head housing. The main shaft serves as a power source to drive the needle bar 51 provided on the needle bar frame to perform reciprocating lifting and lowering motions, so that the rust needle 511 at the bottom of the needle bar can embroider on the embroidery cloth. In addition, when color change is required, the needle bar frame 5 slides laterally along the transverse slide mechanism 3.

[0037] At least one needle bar 51 is laterally mounted on the needle bar frame 5. The needle bar frame 51 is provided with a bottom beam 501 and an intermediate beam 502 located above the bottom beam. The needle bar 51 movably passes through the bottom beam 501 and the intermediate beam 502. The needle bar 51 is connected to a needle bar spring 56 above the intermediate beam. A presser foot 52, a bottom stop 55 located above the presser foot, and a presser foot spring 54 located between the presser foot and the bottom stop are mounted on the needle bar 51 between the bottom beam 501 and the intermediate beam 502. The bottom stop 55 is fixed to the needle bar. An embroidery needle 511 is provided at the bottom of the needle bar 51. The upper portion of the presser foot 52 is movably mounted on the needle bar 51 via a presser foot positioning block 53. A presser foot portion 521 is provided at the bottom of the presser foot 52. A side recess is provided in the middle of the presser foot 52 that spans the bottom beam and can move up and down relative to the bottom beam 501. The presser foot 52 is connected to a presser foot positioning block 53 and a presser foot spring 54. The presser foot positioning block 53 is movably nested with the needle rod 51. The presser foot positioning block 53 is located below the bottom dead center 55. The upper end of the presser foot spring abuts against the bottom dead center 55, and the lower end abuts against the presser foot positioning block 53. When the presser foot positioning block 53 drives the presser foot 52 to rise, it presses the presser foot spring 54 upward. When the presser foot positioning block 53 descends, the presser foot spring 54 returns to its original position.

[0038] In addition, the embroidery machine head also includes a drive shaft 6 mounted on the head housing 4. The drive shaft 6 is arranged vertically and is movably connected to a needle bar driver 7. The needle bar driver 7 and the bottom dead center 55 are separated and connected by a clutch structure. In the connected state, the needle bar driver 7 drives the bottom dead center 55 and the needle bar 51 to rise and fall synchronously. In the separated state, there is no interaction between the needle bar driver 7 and the bottom dead center 55.

[0039] like Figure 3 As shown, in this embodiment, the embroidery machine head is provided with a conjugate cam presser foot driving device 1, which includes a conjugate cam 11 mounted on the main shaft, a conjugate connecting rod assembly driven by the conjugate cam 11, and the conjugate connecting rod assembly is arranged below the main shaft. The conjugate cam 11 has an inner cam surface 111 and an outer cam surface 112. The conjugate connecting rod assembly includes a conjugate connecting rod 12 rotatably connected to a first conjugate connecting rod pin 13, and a presser foot driving connecting rod 16 rotatably connected to a second conjugate connecting rod pin 14. The conjugate connecting rod 12 has a first transmission part and a second transmission part, and the presser foot driving connecting rod 16 has a presser foot driving part. The first transmission part cooperates with the inner cam surface, and the second transmission part cooperates with the outer cam surface, so that the conjugate cam drives the conjugate connecting rod to rotate through the first and second transmission parts, and the conjugate connecting rod drives the presser foot driving connecting rod to rotate. Furthermore, 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, thereby maintaining the relative position of the conjugate link assembly.

[0040] like Figure 3 and Figure 4As shown, the presser foot drive unit is located below the presser foot positioning block 53. The presser foot positioning block 53 is provided with a presser foot positioning portion 531 that protrudes horizontally and cooperates with the presser foot drive unit. The presser foot drive connecting rod 16 is synchronized with the rise and fall of the presser foot when driving the presser foot, so that the presser foot drive unit always maintains contact with the bottom surface of the presser foot positioning block. At the same time, the presser foot spring 54 is always compressed during the presser foot working stroke. Specifically, the distance between the lower dead center 55 and the presser foot positioning block 53 is L1, and the free length of the presser foot spring is L2. During the presser foot working stroke, L1 is always less than L2, so that the presser foot spring is always compressed. Since the presser foot drive unit always maintains contact with the bottom surface of the presser foot positioning block when the presser foot is working, the noise caused by the collision between the two is avoided, thereby reducing the working noise and also helping to increase the maximum operating speed of the main shaft.

[0041] The above-mentioned conjugate cam presser foot driving device, the outer cam surface cooperates with the second transmission part, so that the presser foot positioning block drives the presser foot to complete the ascending stroke; the inner cam surface cooperates with the first transmission part, so that the presser foot positioning block drives the presser foot to complete the descending stroke; compared with the existing technology, only one conjugate cam is required to solve the problem of increased axial space caused by the simultaneous setting of the first cam and the second cam in the existing technology.

[0042] The conjugate link 12 includes a first link segment 121 and a second link segment 122. The first ends of the first and second link segments are rotatably connected to the first conjugate link pin 13, and a link angle A is formed between the first ends of the first and second link segments. The first and second transmission components are provided on the conjugate link, and the first and second conjugate link pins 13 and 14 are mounted on the machine head housing 4. One of the first ends of the first and second link segments 121 and 122 is provided with an inner sleeve, and the other is provided with an outer sleeve. The inner and outer sleeves are nested inside and outside to achieve a rotational fit. A bearing can also be provided between the inner sleeve and the first conjugate link pin 13 to achieve smooth rotational fit. The main parts of the first connecting rod segment 121 and the second connecting rod segment 122 are aligned, so that the first transmission part and the second transmission part are arranged on the same side of the main body of the first connecting rod segment 121 and the second connecting rod segment 122, and the first transmission part and the second transmission part correspond to each other in the axial direction of the conjugate cam 11, and form a corresponding match with the inner cam surface 111 and the outer cam surface 112.

[0043] In addition, the second ends of the first connecting rod segment 121 and the second connecting rod segment 122 are connected by a connecting segment 123, and a connecting rod adjustment structure is provided between the connecting segment 123 and the second end of the second connecting rod segment, and the connecting rod angle is adjusted by the connecting rod adjustment structure. Specifically, the connecting segment is integrally provided with the first connecting rod segment, and the connecting rod adjustment structure includes a fixing hole provided in the second connecting rod segment, an adjustment hole provided in the connecting segment, and a locking screw connecting the adjustment hole and the fixing hole. The adjustment hole can be a waist-shaped hole, and the locking screw can move relative to the adjustment hole. The provision of the connecting rod adjustment structure not only facilitates the rotational connection between the first end of the first connecting rod segment and the second connecting rod segment and the first conjugate connecting rod pin 13, but also enables the connecting rod angle to be adjusted after the conjugate connecting rod and related components are assembled. Finally, the locking screw is fixed, so that the first transmission part and the second transmission part are matched with the inner cam surface 111 and the outer cam surface 112 respectively.

[0044] To reduce wear and impact during transmission, the first transmission section is equipped with a first roller 125, and the second transmission section is equipped with a second roller 126. The second end of the first connecting rod segment is connected to the first roller shaft via a clamping structure 127. A bearing can be provided between the first roller body and the first roller shaft. The second roller shaft of the second roller 126 can be connected to a locking screw 128, and a bearing can be provided between the second roller body and the second roller shaft.

[0045] In this embodiment, the presser foot driving portion is provided with a third roller 161 , and the presser foot positioning block 53 is provided with a presser foot positioning portion 531 protruding above the third roller 161 , and the bottom surface of the presser foot positioning portion 531 cooperates with the third roller 161 .

[0046] When the third roller 161 on the presser foot driving link 16 is lifted upward, the third roller 161 always contacts the bottom surface of the presser foot positioning portion 531, driving the presser foot positioning block 53 to rise. When the third roller 161 on the presser foot driving link 16 is lowered, the presser foot can be lowered under the action of the presser foot spring 54, and the third roller 161 also drops synchronously and always contacts the bottom surface of the presser foot positioning portion 531. That is, the rise of the presser foot relies on the action of the conjugate cam and the conjugate connecting rod assembly, but the descent of the presser foot mainly relies on the action of the presser foot spring. The conjugate cam and the conjugate connecting rod assembly still work, causing the third roller 161 to also drop synchronously. Of course, the presser foot driving link 16 can be connected to a reset torsion spring to ensure better reset.

[0047] Furthermore, the conjugate link assembly further includes an intermediate link 15, the ends of which are respectively connected to the conjugate link and the first end of the presser foot drive link 16. The second end of the second link segment 122 of the conjugate link is provided with a protruding segment 124 protruding outward, and the protruding segment 124 is hinged to the intermediate link 15 via a clamp structure and a link pin.

[0048] In this embodiment, the lateral projection of the main portion of the conjugate link 12 is a triangle, with the first link segment 121, the second link segment 122, and the connecting segment 123 corresponding to the three sides. The lateral projections of the first transmission portion, the second transmission portion, and the first conjugate link pin are respectively arranged at the three corners of the lateral projection triangle of the conjugate link 12. In this way, within a limited space, the first transmission portion, the second transmission portion, and the first conjugate link pin are staggered so as not to interfere with each other. Furthermore, in horizontal projection, the first link segment 121, the second link segment 122, and the connecting segment 123 are all located on the same side of the conjugate cam, forming a compact layout in the lateral space and avoiding an increase in the axial space.

[0049] In some embodiments, the presser foot driving link 16 is a V-shaped link having a first side and a second side, with the fulcrum connected to the second conjugate link pin located at the junction of the first side and the second side. Preferably, the first side is shorter than the second side, wherein the first side is connected to the intermediate link 15. Because the presser foot driving link 16 rotates perpendicular to the horizontal plane, the V-shaped link design can save space in the front-to-back direction.

[0050] In order to reduce noise, the top dead center can be cancelled. The bottom dead center is always combined with the needle bar driver when working. The maximum working stroke of the needle bar driver ensures that the bottom dead center will not hit the needle bar frame, thereby reducing noise during operation. However, this also causes the needle bar and presser foot to work. Before the needle bar and presser foot work, it is necessary to use a needle bar presser structure to press the needle bar down so that the bottom dead center can be combined with the needle bar driver, and the bottom surface of the presser foot drive part cooperates with the third roller.

[0051] like Figure 5 and Figure 6 As shown, in some embodiments, the needle bar structure 2 includes a needle bar motor 25 and a pressure bar 21. The needle bar motor 25 drives the pressure bar 21, causing the pressure bar to press the needle bar 51 down, thereby causing the needle bar driver 7 to correspond in height to the bottom dead center 55. The needle bar driver 7 is connected to the bottom dead center 55 and drives the needle bar 51 through the bottom dead center 55. Before the needle bar and presser foot work, the needle bar structure 2 works. After the needle bar structure 2 presses the needle bar 51 down, the needle bar driver 7 is engaged with the bottom dead center 55 through the clutch structure. At the same time, the bottom surface of the presser foot positioning portion 531 abuts against the third roller 161, and the needle bar structure 2 is reset. Subsequently, the needle bar driver 7 and the conjugate cam presser foot driving device 1 drive the needle bar and presser foot to work accordingly.

[0052] Specifically, the pressure rod 21 is rotatably mounted above the needle bar 51. The pressure rod 21 is provided with a pressing section 211 on the first side of its rotation fulcrum for pressing down the needle bar. The output shaft of the needle bar motor is connected to a cam 23. The pressure rod 21 is provided with a lifting section 212 on the second side of the rotation fulcrum. When the needle bar is pressed down, the cam 23 cooperates with the lifting section 212 to drive the lifting section to lift upward. The pressure rod 21 is equivalent to a lever that can rotate around the rotation fulcrum. The cam 23 cooperates with the lifting section 212 to lift the lifting section and press down the pressing section 211 at the same time.

[0053] Furthermore, the pressure rod can be a V-shaped rod, with an angle between the pressing section and the lifting section. The connection between the pressing section and the lifting section is provided with a downwardly extending lower extension section 213, which is connected to the fulcrum shaft 27. In this way, the ends of the pressing section, the lifting section, and the lower extension section are substantially at the same height, and the motor can also be installed at a lower height, thereby controlling the overall height of the needle pressing rod structure 2. It is understood that the fulcrum shaft can be a bolt structure.

[0054] Furthermore, the pressure rod 21 is connected to an elastic reset member for achieving the lifting of the lower pressure section. Specifically, the elastic reset member is a first torsion spring 26. In this way, the pressure rod 21 can be quickly reset. In addition, the cam 23 can also be connected to a second torsion spring 24.

[0055] Specifically, the needle presser bar motor 25 is mounted on a motor support 22, which includes a base plate 221 and a vertical plate 222. The needle presser bar motor 25 is mounted on a first side of the vertical plate, the presser bar 21 is rotatably mounted on a second side of the vertical plate, and the cam 23 is located on the second side of the vertical plate. The base plate is bolted to the upper portion of the machine head housing, and the needle presser bar structure 2 is mated with the needle bar.

[0056] It can be understood that the connecting rod involved in this embodiment has a function similar to that of a connecting rod, but its shape is not limited to a rod-shaped structure, and a bearing or a bushing can be provided between the connecting rod and the connecting rod pin.

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

Claims

1. A conjugate cam embroidery machine head, characterized in that: It includes a needle presser bar structure and a conjugate cam presser foot driving device, the needle presser bar structure includes a needle bar, a driving shaft, a needle presser bar motor and a pressing bar, the driving shaft is movably mounted with a needle bar driver, the needle bar is fixed with a bottom dead center, the needle presser bar motor drives the pressing bar so that the pressing bar presses the needle bar down, so that the needle bar driver and the bottom dead center correspond in height, the needle bar driver is movably connected to the bottom dead center, and drives the needle bar through the bottom dead center; The conjugate cam presser foot driving device includes a conjugate cam installed on the main shaft and a conjugate connecting rod assembly driven by the conjugate cam, the conjugate cam is provided with an inner cam surface and an outer cam surface; the conjugate connecting rod assembly includes a conjugate connecting rod rotatably connected to the first conjugate connecting rod pin and a presser foot driving connecting rod rotatably connected to the second conjugate connecting rod pin, the conjugate connecting rod is provided with a first transmission part and a second transmission part, and the presser foot driving connecting rod is provided with a presser foot driving part; the first transmission part cooperates with the inner cam surface, and the second transmission part cooperates with the outer cam surface, so that the conjugate cam drives the conjugate connecting rod to rotate through the first transmission part and the second transmission part, and the presser foot driving connecting rod is driven to rotate by the conjugate connecting rod, the presser foot driving part is arranged below the presser foot positioning block, the presser foot positioning block is connected to the presser foot, and after the needle bar structure presses the needle bar down, the presser foot driving part abuts against the bottom surface of the presser foot positioning block, and the presser foot driving connecting rod is synchronized with the lifting and lowering of the presser foot when driving the presser foot to work, so that the presser foot driving part always keeps in contact with the bottom surface of the presser foot positioning block.

2. The conjugate cam embroidery machine head according to claim 1, characterized in that: The conjugate link includes a first link segment and a second link segment. The first ends of the first link segment and the second link segment are rotatably connected to the first conjugate link pin, and a link angle is formed between the first ends of the first link segment and the second link segment.

3. The conjugate cam embroidery machine head according to claim 2, characterized in that: The second ends of the first connecting rod segment and the second connecting rod segment are connected via a connecting segment, and a connecting rod adjustment structure is provided between the connecting segment and the second end of the first connecting rod segment and / or the second connecting rod segment, and the connecting rod angle is adjusted via the connecting rod adjustment structure.

4. The conjugate cam embroidery machine head according to claim 1, characterized in that: The first transmission part is provided with a first roller, and the second transmission part is provided with a second roller. The first roller cooperates with the inner cam surface, and the second roller cooperates with the outer cam surface.

5. The conjugate cam embroidery machine head according to claim 1, characterized in that: The presser foot positioning block is movably connected to the needle rod, the lower dead point is located above the presser foot positioning block, and a presser foot spring is movably connected to the needle rod. The upper end of the presser foot spring abuts the lower dead point and the lower end abuts the presser foot positioning block, and the presser foot spring is always compressed during the presser foot working stroke.

6. The conjugate cam embroidery machine head according to claim 1, characterized in that: The conjugate connecting rod assembly also includes an intermediate connecting rod, the two ends of which are respectively connected to the conjugate connecting rod and the first end of the presser foot driving connecting rod; and / or, the presser foot driving connecting rod is a V-shaped connecting rod, and the presser foot driving part is arranged at the second end of the presser foot driving connecting rod.

7. The conjugate cam embroidery machine head according to claim 1, characterized in that: The pressure rod is rotatably installed above the needle bar, and the pressure rod is provided with a pressing section on the first side of the rotating fulcrum for pressing the needle bar down; the output shaft of the needle bar motor is connected to a cam, and the pressure rod is provided with a lifting section on the second side of the rotating fulcrum. When the needle bar is pressed down, the cam cooperates with the lifting section to drive the lifting section to lift upward.

8. The conjugate cam embroidery machine head according to claim 7, characterized in that: There is an angle between the pressing section and the lifting section; and / or, a lower extension section extending downward is provided at the connection portion between the pressing section and the lifting section, and the lower extension section is connected to the fulcrum shaft.

9. The conjugate cam embroidery machine head according to claim 7, characterized in that: The pressure rod is connected to a first torsion spring for achieving the lifting of the downward pressure section.

10. Embroidery machine, characterized in that, The conjugate cam embroidery machine head comprises the conjugate cam embroidery machine head according to any one of claims 1 to 9.

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