Embroidery machine head driving balance structure and embroidery machine

Abstract

The utility model discloses an embroidery machine head driving balance structure and an embroidery machine, the driving balance structure comprises a balance cam assembly and a two-eye connecting rod which are arranged on a machine head main shaft, and the balance cam assembly is provided with a balance cam and a large balance connecting rod connected with the balance cam. The first end of the two-hole connecting rod is hinged to the machine shell through a first-hole balance pin shaft, the middle section of the two-hole connecting rod is hinged to the large balance connecting rod through a second-hole balance pin shaft, and the eccentric direction of the balance cam assembly and the eccentric direction of the driving cam assembly are opposite in the radial direction of the machine head main shaft. According to the driving balance structure, when the whole driving balance structure and the driving cam assembly move along with the machine head main shaft, the eccentric direction of the balance cam assembly and the eccentric direction of the driving cam assembly are opposite in the radial direction of the machine head main shaft, and therefore the eccentric direction of the balance cam assembly and the eccentric direction of the driving cam assembly are always opposite. In this way, part of inertia force can be counteracted in the rotating process, vibration of the machine head is reduced, and noise is lowered.

Description

[Technical field]

[0001] The utility model belongs to the technical field of embroidery machines, and in particular relates to an embroidery machine. [Background technology]

[0002] The machine head driving structure includes a driving cam assembly installed on the machine head spindle, and the driving cam assembly is connected to a three-eye connecting rod assembly. The structure of the driving cam assembly refers to the existing technology and is usually called a cam four-piece set. Since the driving cam assembly is an eccentric structure, it has a large moment of inertia during rotation, which not only causes the machine head spindle and needle bar to vibrate more, but also causes the entire machine head to vibrate more through conduction, and even resonates. Not only does it greatly affect the embroidery accuracy of the embroidery machine, but it also generates a lot of noise. [Contents of the utility model]

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide an embroidery machine head driving balance structure and an embroidery machine, which can offset a part of the inertia force of the driving cam assembly and reduce the vibration of the machine head.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] Firstly, a driving balance structure of an embroidery machine head is provided, comprising a head spindle arranged on a casing, a driving cam assembly being installed on the head spindle, the driving balance structure being provided with a balancing cam assembly and a two-eye connecting rod installed on the head spindle, the balancing cam assembly being provided with a balancing cam and a balancing large connecting rod connected to the balancing cam, the first end of the two-eye connecting rod being hinged to the casing through a first-eye balancing pin, the middle section of the two-eye connecting rod being hinged to the balancing large connecting rod through a second-eye balancing pin, and the eccentric directions of the balancing cam assembly and the driving cam assembly being arranged in opposite directions in the radial direction of the head spindle.

[0006] Preferably, the driving balance structure is further provided with a balance block, and the second end of the two-eye connecting rod is connected to the balance block.

[0007] Preferably, the first end of the balancing block is provided with a mounting notch, and the mounting notch fits with the second end of the two-eye connecting rod.

[0008] Preferably, the depth of the installation notch is less than the thickness of the second end of the two-eye connecting rod; and / or, a threaded hole is provided on the side of the second end of the two-eye connecting rod, and a fixing hole is provided at the installation notch, and a fastening screw passes through the fixing hole and is connected to the threaded hole.

[0009] Preferably, a counterweight portion is provided at the second end of the balancing block; and / or a fan-shaped portion is provided at the second end of the two-eye connecting rod.

[0010] Preferably, the first-eye balancing pin and the second-eye balancing pin are connected to the two-eye connecting rod via rolling bearings; and / or, a clamp sleeve is provided at one end of the balancing cam, and the clamp sleeve is clamped and fixed on the main shaft of the machine head by a clamping ring.

[0011] On the other hand, the utility model further provides an embroidery machine, comprising a machine head, wherein the machine head is provided with the driving balance structure.

[0012] Preferably, the embroidery machine is a double-needle embroidery machine, a needle bar rack is provided on the front side of the casing, the driving cam assembly is connected to a three-eye connecting rod assembly, the needle bar rack is provided with two needle bars and two presser feet, the casing is provided with two guide shafts parallel to the two needle bars, the two guide shafts are correspondingly provided with two needle bar drivers and two presser foot drivers, the two needle bar drivers correspondingly drive the two needle bars, the three-eye connecting rod assembly is connected to the two needle bar drivers, two presser foot auxiliary connecting rod assemblies are correspondingly provided on the lateral sides of the three-eye connecting rod assembly, the two needle bar drivers are correspondingly connected to the two presser foot auxiliary connecting rod assemblies, and the two presser foot auxiliary connecting rod assemblies are correspondingly connected to the two presser feet.

[0013] Preferably, the head of the three-eye connecting rod assembly is provided with a transversely extending double-headed pin, the needle bar driver is hinged with a needle bar driving connecting rod, and the two shaft heads of the double-headed pin are correspondingly hinged with the two needle bar driving connecting rods; and / or, the presser foot auxiliary connecting rod assembly is provided with a first presser foot connecting rod, a second presser foot connecting rod, and a third presser foot connecting rod, the tail end of the first presser foot connecting rod is hinged with the double-needle machine housing, and the head end is hinged with the tail end of the third presser foot connecting rod, the tail end of the second presser foot connecting rod is hinged with the middle section of the first presser foot connecting rod, and the head end is hinged with the needle bar driver, and the head end of the third presser foot connecting rod is hinged with the presser foot driver.

[0014] Preferably, the presser foot auxiliary connecting rod assembly is further provided with a presser foot connecting rod seat fixed to the housing, and the tail end of the first presser foot connecting rod is hinged to the presser foot connecting rod seat.

[0015] The utility model adopts the above technical solution. When the entire driving balance structure follows the operation of the machine head main shaft together with the driving cam assembly, the eccentric directions of the balancing cam assembly and the driving cam assembly are arranged in opposite directions in the radial direction of the machine head main shaft. Therefore, the eccentric directions of the balancing cam assembly and the driving cam assembly are always opposite to each other. In this way, a part of the inertia force can be offset during the rotation process, thereby reducing the vibration of the machine head and reducing the noise.

[0016] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings.

Brief Description of the Drawings

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] Figure 1It is a schematic diagram of the exploded structure of the double-needle machine head;

[0019] Figure 2 It is a structural schematic diagram of a three-eye connecting rod assembly;

[0020] Figure 3 It is a schematic diagram of the structure of the needle bar driver and the presser foot driver;

[0021] Figure 4 It is a structural schematic diagram of the presser foot auxiliary connecting rod assembly;

[0022] Figure 5 It is a schematic diagram of the exploded structure between the machine head drive balance structure and the double needle machine housing;

[0023] Figure 6 It is a schematic diagram of the structure of the two-eye connecting rod and the balance block;

[0024] Figure 7 This is a schematic diagram of the structure in which the balancing block is fixed with a set screw and a two-eye connecting rod;

[0025] Figure 8 It is a schematic diagram of the structure after the balancing block is combined with the two-eye connecting rod and the balancing cam assembly;

[0026] Fig. 9 It is a schematic diagram of the relative positions of the machine head driving structure and the driving balance structure viewed from the axial direction;

[0027] Fig.10 It is a schematic diagram of the combination of the two-eye connecting rod and the balancing cam assembly when no balancing block is provided;

[0028] Fig.11 It is a schematic diagram of the arrangement of several shuttle box assemblies (part of the shuttle boxes in the double-needle embroidery machine) when the bottom thread cutting device in the embodiment is not installed;

[0029] Fig.12 Schematic diagram of the exploded structure of the bottom thread cutting device in the embodiment;

[0030] Fig.13 This is a schematic diagram of the bottom thread cutting device installed on the front side of the shuttle box in the embodiment;

[0031] Fig.14 for Fig.13 Enlarged view of point A in the middle;

[0032] Figure numerals: double needle housing 100, guide shaft 101, pin seat 102, head driving structure 1, driving cam assembly 11, cam connecting rod 111, three-eye connecting rod assembly 12, first eye pin 121, second eye pin 122, double-head pin 123, needle bar driver 13, needle bar driving connecting rod 131, presser foot auxiliary connecting rod assembly 14, first presser foot connecting rod 141, second presser foot connecting rod 142, third presser foot connecting rod 143, presser foot connecting rod seat 144, presser foot driver 15, presser foot driving pin 151, driving balance structure 2, two-eye connecting rod 21, first eye balance pin 211, second eye balance pin 212, fan-shaped portion 213, balance block 22, installation notch 221, matching The heavy part 222, the fixing hole 223, the fastening screw 224, the balancing cam assembly 23, the clamp sleeve 231, the balancing large connecting rod 232, the clamping ring 24, the shuttle box assembly 300, the rotary hook assembly 301, the mounting beam 302, the bottom line cutting device 3, the thread cutting drive shaft 31, the thread cutting connecting rod assembly 32, the thread cutting connecting rod seat 321, the first thread cutting connecting rod 322, the second thread cutting connecting rod 323, the movable knife gear seat 33, the rack guide groove 331, the cantilever beam 332, the movable knife lower support seat 34, the rolling bearing 341, the scissors assembly 35, the fixed knife 351, the movable knife 352, the gear 353, the gear drive shaft 3531, the fixed knife seat 354, the rack 36, the rack pressure block 37, and the groove 371. [Specific implementation method]

[0033] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0034] Those skilled in the art will appreciate that, in the absence of conflict, the features in the following embodiments and implementations may be combined with each other.

[0035] 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 following words indicating orientation or positional relationship, such as "upper", "lower", "inner", "outer", "front", "back", etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0039] The following describes the drive balance structure and the bottom thread cutting device using a double-needle embroidery machine as an example.

[0040] like Figures 1 to 10 The double-needle embroidery machine shown is provided with a double-needle machine head, which includes a double-needle machine housing 100 and a needle bar frame arranged at the front side of the double-needle machine housing, and the double-needle machine housing is laterally penetrated with a machine head spindle. For the double-needle embroidery machine, the needle bar frame is provided with two needle bars and two presser feet (it can also be more, but only two needle bars and two presser feet work at a time, and only two needle bars and two presser feet are provided in this embodiment), and the double-needle machine housing 100 is provided with a machine head driving structure 1 and two guide shafts 101 parallel to the two needle bars, that is, one guide shaft 101 is provided corresponding to each needle bar, and the two guide shafts 101 are arranged side by side laterally.

[0041] The machine head driving structure 1 includes a driving cam assembly 11 installed on the machine head main shaft, and the driving cam assembly 11 is connected to a three-eye connecting rod assembly 12. The structure of the driving cam assembly 11 refers to the prior art, which is usually called a cam four-piece set or simply a four-piece set, and is provided with a cam connecting rod 111. Two needle bar drivers 13 and two presser foot drivers 15 are correspondingly provided on the two guide shafts, that is, a needle bar driver 13 and a presser foot driver 15 are correspondingly provided on each guide shaft 101, and the two needle bar drivers 13 drive two needle bars correspondingly, and the lateral sides of the three-eye connecting rod assembly 12 are correspondingly connected to the two needle bar drivers 13, and the lateral sides of the three-eye connecting rod assembly 12 are correspondingly provided with two presser foot auxiliary connecting rod assemblies 14, and the two needle bar drivers 13 are correspondingly connected to the two presser foot auxiliary connecting rod assemblies 14, and the two presser foot auxiliary connecting rod assemblies 14 are correspondingly connected to the two presser feet.

[0042] like Figure 2 and Figure 3 As shown, the head of the three-eye connecting rod assembly 12 is provided with a double-headed pin shaft 123 extending laterally, and the needle bar driver 13 is hinged with a needle bar driving connecting rod 131, and the two shaft heads of the double-headed pin shaft are correspondingly hinged with the two needle bar driving connecting rods 131. The tail of the three-eye connecting rod assembly 12 is hinged with a first-eye pin shaft 121, and a pin shaft seat 102 is provided on the rear side wall of the double needle housing, and a movable groove is provided in the middle of the pin shaft seat. The first-eye pin shaft 121 passes through the movable groove laterally, and the two ends are rotatably supported on the pin shaft seat 102. The middle of the three-eye connecting rod assembly 12 is hinged with a second-eye pin shaft 122, which is hinged with the cam connecting rod 111.

[0043] like Figure 3 and Figure 4 As shown, the presser foot auxiliary connecting rod assembly 14 is provided with a first presser foot connecting rod 141, a second presser foot connecting rod 142, and a third presser foot connecting rod 143. The tail end of the first presser foot connecting rod is hinged to the double needle housing 100, and the head end is hinged to the tail end of the third presser foot connecting rod. The tail end of the second presser foot connecting rod is hinged to the middle part of the first presser foot connecting rod, and the head end is hinged to the needle bar driver 13. The head end of the third presser foot connecting rod is hinged to the presser foot driver 15. The presser foot driver 15 is correspondingly provided with a presser foot driving pin 151 hinged to the head end of the third presser foot connecting rod. In this way, when the needle bar driver 13 moves up and down along the guide shaft 101, the presser foot driver 15 is also driven by the needle bar driver 13 to move up and down along the guide shaft 101. It can be understood that according to the time requirements of the needle bar and presser foot actions, the time requirements between the actions of the needle bar driver 13 and the presser foot driver 15 can be met through the design of the presser foot auxiliary connecting rod assembly 14.

[0044] Further, the presser foot auxiliary connecting rod assembly 14 is also provided with a presser foot connecting rod seat 144 fixed to the double needle housing, and the tail end of the first presser foot connecting rod is hinged to the presser foot connecting rod seat 144. The presser foot connecting rod seat 144 can be fixed to the rear side wall of the double needle housing by screws.

[0045] In the above technical solution, two needle bar drivers correspondingly drive two needle bars, and at the same time, two presser foot auxiliary connecting rod assemblies are used to correspondingly drive two presser foot movements. On the one hand, there is no need to set up an additional independent presser foot driving structure; on the other hand, the structure is not complicated, and the two presser foot drivers correspondingly move on two existing guide shafts, and the structure of the two added presser foot auxiliary connecting rod assemblies is also relatively mature, thus reducing the cost and ensuring the reliability of the presser foot.

[0046] According to the above records, the double-needle embroidery machine drives two needle bars and two presser feet to move through the driving cam assembly 11, and the driving cam assembly 11 is driven to rotate by the machine head main shaft. Since the driving cam assembly 11 is an eccentric structure (the meaning of eccentricity here is: in the main structure of the driving cam assembly, the driving cam is eccentric, and the center of gravity of the driving cam assembly also deviates from the machine head main shaft), it has a large moment of inertia during rotation, which not only causes the machine head main shaft and needle bar to vibrate more, but also causes the entire machine head to vibrate more through conduction, and even resonance occurs. Not only does it greatly affect the embroidery accuracy of the embroidery machine, but it also generates a lot of noise.

[0047] To solve this problem, Figure 5 and Figure 6 As shown, a driving balance structure 2 is also provided on the machine head, and the driving balance structure 2 is provided with a balance cam assembly 23 installed on the machine head main shaft, a two-eye connecting rod 21 and a balance block 22. The balance cam assembly 23 is provided with a balance cam and a balance large connecting rod 232 connected to the balance cam, the first end of the two-eye connecting rod is hinged to the side wall of the double-needle machine housing through a first-eye balance pin 211, the middle section of the two-eye connecting rod is hinged to the balance large connecting rod 232 through a second-eye balance pin 212, and the second end of the two-eye connecting rod is connected to the balance block 22. Among them, the eccentric direction of the balance cam assembly 23 and the driving cam assembly 11 is set in the opposite direction in the radial direction of the machine head main shaft, but it is not limited to be 180 degrees apart in the circumferential direction. Similar to the driving cam assembly 11, in the main structure of the balancing cam assembly 23, the balancing cam is eccentric, which also causes the center of gravity of the balancing cam assembly to deviate from the main axis of the machine head. That is, from the axial projection of the machine head driving structure, the center of gravity of the balancing cam assembly 23 and the driving cam assembly 11 (that is, the center of gravity of the balancing cam and the driving cam) are set in opposite directions in the radial direction of the main axis of the machine head, but are not limited to being in the same radial direction.

[0048] When the entire driving balance structure 2 follows the main shaft of the machine head together with the driving cam assembly 11, on the one hand, the eccentric direction of the balance cam assembly 23 is always opposite to that of the driving cam assembly 11, so that a part of the inertia force can be offset during the rotation process; on the other hand, a part of the inertia force is also balanced and offset by the balance block 22. In addition, the eccentric weights of the driving cam assembly 11 and the balance block 22 can be determined by experiments, so that the mutual inertia can be basically offset to achieve balance.

[0049] Therefore, vibration can be reduced, and resonance is basically eliminated, the operation is more stable, which is beneficial to improving the embroidery accuracy of the double-needle embroidery machine and reducing noise.

[0050] like Fig. 9 In the state shown, the eccentric direction of the driving cam assembly 11 (i.e., the center of gravity of the driving cam) is on the radial upper side of the main shaft of the machine head, and the eccentric direction of the balancing cam assembly 23 (the center of gravity of the balancing cam) is on the radial lower side of the main shaft of the machine head. Correspondingly, the inertia force of the driving cam assembly 11 is upward, and the inertia force of the balancing cam assembly 23 is downward.

[0051] Because the balancing cam assembly 23 mainly offsets most of the inertial force, it is understandable that if the remaining inertial force is small after the balancing cam assembly 23 offsets a part of the inertial force, the balancing block may not be provided. Fig.10 As shown, when the balancing block is not provided, the two-eye connecting rod and the balancing cam assembly can be combined.

[0052] The first eye balancing pin 211 and the second eye balancing pin 212 are connected to the two eye connecting rods through rolling bearings. Of course, other rotating connection parts in this embodiment can also use rolling bearings.

[0053] In order to install the balancing weight, the first end of the balancing weight 22 is provided with a mounting notch 221, and the mounting notch is matched with the second end of the two-eye connecting rod 21, so that the balancing weight and the second end of the two-eye connecting rod are combined into one, and together play the role of the balancing weight. In addition, the depth L2 of the mounting notch 221 is less than the thickness L1 of the second end of the two-eye connecting rod. A threaded hole is provided on the side of the second end of the two-eye connecting rod, and a fixing hole 223 is provided at the mounting notch, and a fastening screw 224 passes through the fixing hole and is connected to the threaded hole. Of course, the balancing weight can be replaced as needed to better play a balancing role, and the above-mentioned detachable structure between the balancing weight and the two-eye connecting rod is also conducive to choosing whether to install the balancing weight as needed.

[0054] Further, the second end of the balancing block 22 is provided with a counterweight 222, and the volume and weight of the counterweight can be appropriately increased. The second end of the two-eye connecting rod is provided with a fan-shaped portion 213, thereby increasing a certain volume and also having the function of a balancing block.

[0055] In order to install the balancing cam assembly on the machine head spindle, a clamp sleeve 231 is provided at one end of the balancing cam, and the clamp sleeve 231 is clamped and fixed on the machine head spindle by a clamping ring 24.

[0056] It can be understood that the above-mentioned limitations on the names of the connecting rods such as the two-eye connecting rod, the three-eye connecting rod, the first presser foot connecting rod, the second presser foot connecting rod, the third presser foot connecting rod, etc. are only for distinguishing different connecting rods, rather than limiting the specific structure of the connecting rods.

[0057] It can be understood that the above-mentioned driving balance structure can be applied not only to double-needle embroidery machines, but also to other types of embroidery machines, such as single-needle embroidery machines, because they are also provided with a driving cam assembly.

[0058] In addition, referring to the structure of a double-needle embroidery machine in the prior art, a frame is provided, a plurality of machine heads are mounted on the crossbeam of the frame, and an embroidery frame is provided under the machine heads. In addition, a plurality of shuttle box assemblies 300 are arranged side by side in the horizontal direction, and the shuttle box assembly is provided with a shuttle box body and a rotary shuttle assembly 301, and a bottom thread cutting device 3 is provided on the front side of the shuttle box body for cutting the bottom thread. The bottom thread cutting device 3 is provided with a scissors assembly 35, and a mounting beam 302 extends forward from the shuttle box body for mounting the scissors assembly. The number of shuttle box assemblies 300 does not necessarily correspond to the number of machine heads, but the number of rotary shuttle assemblies and scissors assemblies is twice the number of machine heads, that is, corresponding to the number of needles. Fig.11 As shown in the example, one shuttle box assembly corresponds to two machine heads, and is provided with four rotary hook assemblies and four scissor assemblies.

[0059] In the prior art, the thread cutting device comprises a plurality of scissor assemblies arranged side by side in the horizontal direction. In addition, the device further comprises a thread cutting drive shaft 31 arranged on the front side of the shuttle box body, the thread cutting drive shaft 31 extending in the horizontal direction and moving in a straight line in the horizontal direction. The scissor assembly 35 comprises a fixed knife 351 and a movable knife 352 cooperating with the fixed knife to cut the thread. The fixed knife 351 is fixed on the front side of the shuttle box body. The fixed knife can be arranged on a fixed knife seat 354 and mounted on a mounting beam 302. The movable knife 352 is connected to the mounting beam through a knife shaft. A thread cutting connecting rod assembly 32 is arranged between the thread cutting drive shaft 31 and the movable knife 352. One thread cutting connecting rod assembly 32 is arranged correspondingly for each scissor assembly 35. In this way, one thread cutting drive shaft can drive all scissor assemblies correspondingly through a plurality of thread cutting connecting rod assemblies.

[0060] The embroidery frame has a large area and needs to be translated in the X and Y directions. The embroidery frame includes a front part arranged at the front side of the shuttle box, a rear part arranged at the rear side of the shuttle box body, and a plurality of intermediate connectors connecting the front part and the rear part, wherein the intermediate connector passes through the gap between two adjacent shuttle box components. Of course, not all gaps between two adjacent shuttle box components pass through the intermediate connector.

[0061] As the number of heads increases and the head spacing decreases, the space between two adjacent shuttle box assemblies is extremely limited. If an intermediate connector is provided, the setting of the thread trimming connecting rod assembly closest to the intermediate connector will be limited by space, affecting the further reduction of the head spacing.

[0062] In order to further reduce the distance between the machine heads without affecting the thread trimming function. Figure 12 to Figure 14 As shown, in at least one pair of adjacent scissor assemblies (i.e., adjacent scissor assemblies arranged near one side of the intermediate connecting member), the corresponding two movable knives 352 are each connected to a gear 353, and the two gears are meshed with the same rack 36, one of the gears 353 is connected to a gear drive shaft 3531, the gear drive shaft 3531 extends vertically and the lower end is connected to the wire-cutting connecting rod assembly 32, and the other gear rotates around the gear shaft, and the corresponding movable knife does not need to be connected to the wire-cutting connecting rod assembly 32. Only one wire-cutting connecting rod assembly 32 is needed to drive a corresponding movable knife, and the gear of the movable knife is meshed with the rack 36, and the rack is driven to move linearly during the wire-cutting process, thereby driving the other gear to rotate synchronously, and the corresponding other movable knife performs the wire-cutting action synchronously. In this way, a scissor assembly arranged near one side of the intermediate connecting member does not need to be provided with a wire-cutting connecting rod assembly and a gear drive shaft, and even if the head spacing is reduced, it will not interfere with the intermediate connecting member, and will not affect the normal wire-cutting function.

[0063] One end of the movable knife 352 is fixed to the gear 353, and the other end is provided with a concave surface that cooperates with the fixed knife 351. The side of the concave surface is provided with a cutting edge, so that the moving knife edge and the fixed knife edge can overlap and stagger when cutting the thread, thereby cutting the bottom thread.

[0064] Furthermore, the bottom thread cutting device 3 is also provided with a movable knife gear seat 33, the gear drive shaft 3531 is rotatably supported on the movable knife gear seat 33, and a rolling bearing can be provided. The rack is provided on the movable knife gear seat, and the movable knife gear seat supports the movable knife drive shaft and the rack. The movable knife gear seat 33 is provided with a rack guide groove 331 extending laterally, and the bottom surface of the rack is provided with a rack guide block, and the rack guide block cooperates with the rack guide groove to guide the rack to move linearly.

[0065] Furthermore, a rack pressing block 37 is provided above the rack 36. Specifically, a rack pressing block 37 is provided on each of the lateral sides of the rack. One end of the rack pressing block is fixed to the movable cutter gear seat by a screw, and a groove 371 is provided on the bottom surface of the other end. A rack activity space is formed between the groove 371 and the movable cutter gear seat. When the rack moves, it moves through the rack activity space between the groove and the movable cutter gear seat.

[0066] Furthermore, a moving knife lower support seat 34 is provided below the moving knife gear seat 33, and the gear drive shaft is rotatably supported on the moving knife lower support seat 34, and a rolling bearing 341 can be provided correspondingly. The upper and lower parts of the gear drive shaft are rotatably supported on the moving knife gear seat 33 and the moving knife lower support seat 34, respectively, to ensure the rotation accuracy of the gear.

[0067] Furthermore, the movable knife gear seat 33 is provided with a cantilever beam 332, the gear driving shaft 3531 is rotatably supported on the cantilever beam, and a corresponding fixed knife can be fixed on the cantilever beam.

[0068] Since the stroke of the moving knife is not very large, the gear can adopt sector teeth to reduce costs. Of course, it is also possible to adopt a complete gear.

[0069] The structure of the wire trimmer link assembly is the same as that of the prior art. The wire trimmer link assembly 32 includes a wire trimmer link seat 321, a first wire trimmer link 322, and a second wire trimmer link 323. The wire trimmer link seat is fixed to the wire trimmer drive shaft. The first end of the first wire trimmer link is hinged to the wire trimmer link seat, and the second end is hinged to the first end of the second wire trimmer link. The second end of the second wire trimmer link is fixed to the gear drive shaft.

[0070] It can be understood that the above-mentioned bottom thread cutting device can be applied not only to double-needle embroidery machines, but also to other types of embroidery machines, such as single-needle embroidery machines.

[0071] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. An embroidery machine head drive balance structure, comprising a head spindle arranged on a housing, a driving cam assembly being installed on the head spindle, characterized in that: The driving balancing structure includes a balancing cam assembly and a two-eye connecting rod installed on the head spindle. The balancing cam assembly is provided with a balancing cam and a balancing large connecting rod connected to the balancing cam. The first end of the two-eye connecting rod is hinged to the housing through a first-eye balancing pin, and the middle section of the two-eye connecting rod is hinged to the balancing large connecting rod through a second-eye balancing pin. The eccentric directions of the balancing cam assembly and the driving cam assembly are arranged in opposite directions in the radial direction of the head spindle.

2. The embroidery machine head drive balancing structure according to claim 1, characterized in that: The driving balance structure is also provided with a balance block, and the second end of the two-eye connecting rod is connected to the balance block.

3. The embroidery machine head drive balancing structure according to claim 2, characterized in that: The first end of the balancing block is provided with a mounting notch, and the mounting notch is matched with the second end of the two-eye connecting rod.

4. The embroidery machine head drive balancing structure according to claim 3, characterized in that: The depth of the installation notch is less than the thickness of the second end of the two-eye connecting rod; and / or, a threaded hole is provided on the side of the second end of the two-eye connecting rod, and a fixing hole is provided at the installation notch, and a fastening screw passes through the fixing hole and is connected to the threaded hole.

5. The embroidery machine head drive balancing structure according to claim 2, characterized in that: The second end of the balancing block is provided with a counterweight portion; and / or the second end of the two-eye connecting rod is provided with a fan-shaped portion.

6. The embroidery machine head drive balancing structure according to claim 1, characterized in that: The first-eye balancing pin and the second-eye balancing pin are connected to the two-eye connecting rod via rolling bearings; and / or, a clamp sleeve is provided at one end of the balancing cam, and the clamp sleeve is clamped and fixed on the main shaft of the machine head by a clamping ring.

7. An embroidery machine, comprising a machine head, characterized in that: The machine head is provided with a driving balance structure as described in any one of claims 1 to 6.

8. An embroidery machine according to claim 7, characterized in that: The embroidery machine is a double-needle embroidery machine, a needle bar rack is provided on the front side of the casing, a driving cam assembly is connected to a three-eye connecting rod assembly, the needle bar rack is provided with two needle bars and two presser feet, the casing is provided with two guide shafts parallel to the two needle bars, the two guide shafts are correspondingly provided with two needle bar drivers and two presser foot drivers, the two needle bar drivers correspondingly drive the two needle bars, the three-eye connecting rod assembly is connected to the two needle bar drivers, the lateral sides of the three-eye connecting rod assembly are correspondingly provided with two presser foot auxiliary connecting rod assemblies, the two needle bar drivers are correspondingly connected to the two presser foot auxiliary connecting rod assemblies, and the two presser foot auxiliary connecting rod assemblies are correspondingly connected to the two presser feet.

9. An embroidery machine according to claim 8, characterized in that: The head of the three-eye connecting rod assembly is provided with a transversely extending double-headed pin shaft, the needle bar driver is hinged with a needle bar driving connecting rod, and the two shaft heads of the double-headed pin shaft are correspondingly hinged with the two needle bar driving connecting rods; and / or, the presser foot auxiliary connecting rod assembly is provided with a first presser foot connecting rod, a second presser foot connecting rod, and a third presser foot connecting rod, the tail end of the first presser foot connecting rod is hinged with the double-needle machine housing, and the head end is hinged with the tail end of the third presser foot connecting rod, the tail end of the second presser foot connecting rod is hinged with the middle section of the first presser foot connecting rod, and the head end is hinged with the needle bar driver, and the head end of the third presser foot connecting rod is hinged with the presser foot driver.

10. An embroidery machine according to claim 9, characterized in that: The presser foot auxiliary connecting rod assembly is also provided with a presser foot connecting rod seat fixed to the housing, and the tail end of the first presser foot connecting rod is hinged to the presser foot connecting rod seat.

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