Sewing machine needle frame swing transmission mechanism

Abstract

A sewing machine needle frame swing transmission mechanism belongs to the technical field of sewing mechanical equipment. Comprising a main shaft, a swing linkage servo motor, a front needle frame, a front needle rod, a rear needle frame, a rear needle rod, a needle frame connecting support and a needle rod linkage assembly. Wherein the end part of one end of the main shaft is provided with a needle bar crank, and the shaft body of the main shaft is sleeved with a front needle frame longitudinal driving cam; the front needle rod is fixedly arranged on the front needle frame, the rear needle rod is fixedly arranged on the rear needle frame, linkage between the front needle rod and the rear needle rod is achieved through the needle rod linkage assembly, the swing linkage servo motor is in transmission connection with the front needle frame and the rear needle frame, and the front needle frame longitudinal driving cam drives the front needle frame to move forwards. And the needle bar crank can drive the rear needle bar to be linked with the front needle bar. The device has the advantages that the device is stable and reliable to use, the front needle rod and the rear needle rod freely and alternately act, the manufacturing requirements of the left, middle and right lower needle points and stepless adjustment of the distance between the two needle rods are met, and richer pattern combinations are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines, and in particular relates to a swing transmission mechanism for a sewing machine needle frame. Background Art

[0002] Shoes are essential items in our lives. With the continuous development of the economy and society and the improvement of people's living standards, people not only require shoes to be comfortable, durable and able to provide effective protection for the feet, but also have higher requirements for the appearance of shoes. Therefore, in order to meet people's various needs, manufacturers sometimes sew pattern stitches on the uppers of shoes to improve the appearance of the shoes and attract people to buy them. In order to meet the sewing needs of sewing pattern stitches, double-needle upper pattern sewing machines have emerged on the market. The patterns of this type of sewing machine are usually realized by a combination of a set of pattern cams and a set of feeding cams. However, in the process of actual production and application, with people's increasing attention to shoe pattern design and increasingly fierce market competition, the existing shoe production usually has the need to sew a pattern stitch on the upper while sewing two to three stitches of other pattern bundles on both sides of the upper. However, the current double-needle upper pattern sewing machine cannot sew multiple patterns at one time, so it can only be completed by hand. This manual operation is not only labor-intensive and time-consuming, inefficient, and has high production costs, but also inconvenient to operate and depends on the operator's experience and carefulness, resulting in uneven production quality and hindering the overall appearance of the shoe upper.

[0003] In order to solve the above situation, PLC automatically controlled sewing machines have appeared on the market to achieve the purpose of sewing a variety of patterns. However, this type of automatically controlled sewing machine is not only expensive, but also has the characteristics of immature technology and poor stability, so it is not widely used; but the above-mentioned PLC automatically controlled sewing machine structure has some disadvantages, such as: first, the distance between the two needles often has only fixed specifications, and the pattern cam needs to be replaced to achieve the change of the distance between the two needles; in addition, this structure can only sew the pattern composed of the needle points of the two fixed needles on the left and right, and cannot sew a variety of complicated patterns composed of the three needle points on the left, middle and right. There is still a small scope of application and it cannot meet the market demand.

[0004] In view of the above situation, it is necessary to reasonably improve the structure of the needle bar needle seat transmission device of the existing pattern sewing machine. For this reason, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Utility Model Content

[0005] The purpose of the utility model is to provide a sewing machine needle holder swing transmission mechanism which has a simple and compact structure, is easy to operate, and is stable and reliable to use. It helps to achieve free alternation of the front and rear needle bars by optimizing the overall transmission structure, and can achieve three needle insertion points on the left, middle and right, and the distance between the front and rear needle bars can be steplessly adjusted within the space of the machine head, thereby achieving richer and more diverse pattern stitches, which has significant promotion significance.

[0006] The purpose of the utility model is achieved in this way. A sewing machine needle frame swing transmission mechanism comprises: a main shaft, a swing linkage servo motor, a front needle frame, a front needle bar, a rear needle frame, a rear needle bar, a needle frame connecting bracket and a needle bar linkage assembly; wherein, the main shaft is transmission-connected with a power input source, a needle bar crank is also installed on one end portion of the main shaft in the length direction, and a front needle frame longitudinal driving cam is mounted on the main shaft body; the front needle bar is fixedly arranged on the front needle frame and extends downward from a position slightly above the middle of the front needle frame and passes through the bottom of the front needle frame, the rear needle bar is also fixedly arranged on the rear needle frame and extends downward from a position slightly above the middle of the rear needle frame and passes through the bottom of the rear needle frame, and the top end of the front needle frame and the top end of the rear needle frame are connected by a needle frame connecting bracket. The front needle bar and the rear needle bar are connected and the top ends of the two can be relatively rotated through the needle holder connecting bracket, and the front needle bar and the rear needle bar are linked through the needle bar linkage assembly; the front needle holder longitudinal driving cam on the main shaft can drive the front needle holder to move forward through the transmission assembly, and the swing linkage servo motor is transmission-connected with the front needle holder and the rear needle holder and can drive the front needle holder and the rear needle holder to move left and right alternately, and realize the left and right alternating action of the front needle bar and the rear needle bar, and the needle bar crank on the main shaft is transmission-connected with the rear needle bar, and the needle bar crank can drive the rear needle bar to be linked with the front needle bar and realize the up and down puncture action, and under the transmission of the main shaft and the swing linkage servo motor, the front needle bar and the rear needle bar can be linked to perform left and right alternation and up and down reciprocating puncture action, thereby realizing the sewing of shoe upper pattern stitches.

[0007] In a specific embodiment of the present invention, the front needle holder is vertically arranged and a front needle holder connecting seat is formed at a position downward from the middle of its height direction, and the front needle rod is vertically penetrated in the front needle holder connecting seat and downwardly passes through the bottom of the front needle holder connecting seat; and the rear needle holder is also vertically arranged and a rear needle holder middle connecting section and a rear needle holder bottom connecting section are respectively formed at the middle and bottom positions in the height direction, the rear needle rod passes through the rear needle holder middle connecting section and the rear needle holder bottom connecting section in sequence from top to bottom, and the rear needle rod downwardly passes through the rear needle holder bottom connecting section.

[0008] In another specific embodiment of the present invention, a rear needle bar connecting rod is also connected to a side position of the needle bar crank facing the rear needle frame; wherein a rear needle bar connecting rod pin is formed at the top of the rear needle bar connecting rod, and the rear needle bar connecting rod pin penetrates into the top part of the needle bar crank body and is locked and fixed with the needle bar crank, thereby realizing the positioning connection between the rear needle bar connecting rod and the needle bar crank; a rear needle bar hinge is connected to the bottom of the rear needle bar connecting rod, and a rear needle bar chuck is fixedly mounted on the rod body of the rear needle bar, and the rear needle bar chuck can be cooperated and installed in the rear needle bar hinge and rotatably connected thereto, thereby realizing the hinge between the rear needle bar and the rear needle bar connecting rod.

[0009] In another specific embodiment of the utility model, a front needle stand longitudinal connecting block is fixedly connected to the front needle stand connecting seat of the front needle stand by a fastener, and a front needle stand longitudinal pull rod is provided below the front needle stand longitudinal connecting block, and the front needle stand longitudinal pull rod is connected to the front needle stand longitudinal connecting block by a pull rod pin; the front needle stand longitudinal driving cam on the main shaft is connected to the front needle stand longitudinal pull rod through a transmission arm assembly, so that the front needle stand longitudinal driving cam can drive the front needle stand to move forward.

[0010] In another specific embodiment of the present invention, a needle holder positioning groove is formed on the needle holder connecting bracket, and the top end portions of the front needle holder and the rear needle holder are both positioned and installed in the needle holder positioning groove, and a needle holder fulcrum pin is also penetrated in the needle holder connecting bracket, and the needle holder fulcrum pin passes through the top end portions of the front needle holder and the rear needle holder in sequence to realize the connection between the two, and a needle holder connecting joint bearing is also arranged between the needle holder fulcrum pin and the matching hole of the front needle holder, and the needle holder connecting joint bearing is used to realize the support and positioning of the needle holder fulcrum pin, and the needle holder connecting joint bearing can make the front needle holder and the needle holder fulcrum pin rotatably connected together, and can realize the relative rotation between the front needle holder and the rear needle holder, and a needle holder connecting joint bearing washer is also arranged on one side of the needle holder connecting joint bearing, and the needle holder connecting joint bearing washer passes through the needle holder connecting bracket body and is mounted on the needle holder fulcrum pin.

[0011] In another specific embodiment of the present invention, the needle bar linkage assembly includes a needle bar linkage block, a needle bar linkage rod, an upper linkage joint bearing and a lower linkage joint bearing; the needle bar linkage block is locked and fixed to the top end of the rear needle bar by a fastener, and a needle bar linkage block connecting shaft is also convexly provided on the needle bar linkage block, and the upper linkage joint bearing and the lower linkage joint bearing are respectively installed at the upper and lower ends of the needle bar linkage rod, and a front needle bar chuck piece is also locked and fixed on the front needle bar rod body by a fastener, and a front needle bar chuck piece connecting shaft is also convexly provided on the front needle bar chuck piece, the needle bar linkage block connecting shaft penetrates into the upper linkage joint bearing and realizes transmission connection therewith, and the front needle bar chuck piece connecting shaft penetrates into the lower linkage joint bearing and realizes transmission connection therewith, thereby realizing the transmission connection between the needle bar linkage block, the needle bar linkage rod and the front needle bar chuck piece, so that the front needle bar and the rear needle bar can be linked.

[0012] In a further specific embodiment of the present invention, a needle holder left-right swing linkage rocker arm is connected to the power output shaft of the swing linkage servo motor, and a front needle holder swing transmission arm is formed at the upper part of the needle holder left-right swing linkage rocker arm, and a rear needle holder swing transmission arm is formed at the lower part of the needle holder left-right swing linkage rocker arm; and a front needle holder swing connecting block is formed on the front needle holder, and a front needle holder swing connecting rod is provided on the front needle holder swing connecting block, one end portion of the front needle holder swing connecting rod in the length direction is hinged to the front needle holder swing connecting block through a connecting pin, and the length of the front needle holder swing connecting rod The other end portion in the direction is hinged to the front needle holder swing transmission arm through a connecting pin, thereby realizing the transmission connection between the front needle holder swing transmission arm and the front needle holder; and a rear needle holder swing connecting block is also formed on the bottom part of the rear needle holder, and a rear needle holder swing connecting rod is provided on the rear needle holder swing connecting block, and one end portion of the rear needle holder swing connecting rod in the length direction is hinged to the rear needle holder swing connecting block through a connecting pin, and the other end portion of the rear needle holder swing connecting rod in the length direction is hinged to the rear needle holder swing transmission arm through a connecting pin, thereby realizing the transmission connection between the rear needle holder swing transmission arm and the rear needle holder.

[0013] In a more specific embodiment of the present invention, a front needle is connected to the bottom end of the front needle rod, and a rear needle is connected to the bottom end of the rear needle rod. The front needle and the rear needle are used together to sew pattern stitches on the shoe upper.

[0014] In yet another specific embodiment of the present invention, a front needle holder guide plate is fixedly connected to the lower middle portion of the front needle holder body by a fastener, and the front needle holder guide plate is vertically arranged.

[0015] In yet another specific embodiment of the present invention, a front guide block of the rear needle holder is installed at the bottom end of the rear needle holder body, and a rear guide block of the rear needle holder is also provided below the rear needle holder. The front guide block of the rear needle holder and the rear guide block of the rear needle holder are used to limit the forward and backward movement of the rear needle holder.

[0016] After the utility model adopts the above structure, it has the beneficial effects: first, by optimizing the overall structure, the front needle holder, the rear needle holder and the front needle bar and the rear needle bar thereon in the technical solution can realize free alternating movements, and the distance between the front needle bar and the rear needle bar can be set without steps, and at the same time, the left, middle and right multi-point needle insertion actions of the front needle and the rear needle can be realized, so as to realize richer stitch pattern combinations, with a wide range of applications and effectively enhance product competitiveness; in addition, the overall structure of the technical solution is compact, the combination between the transmission structures is firm, the operation is stable and precise, and no flower disc control is required during the operation, the operation is convenient, and while reducing the production and maintenance costs, it is beneficial to improve the appearance of the upper to meet the actual market needs, can effectively achieve high production efficiency, and ensure the quality of the upper, which is suitable for the requirements of industrialized scale-up production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure decomposition of an embodiment of the utility model;

[0018] Figure 2 It is a plan view of an application example of the utility model.

[0019] In the figure: 1. spindle, 11. needle bar crank, 12. front needle frame longitudinal driving cam, 13. rear needle bar connecting rod, 131. rear needle bar connecting rod pin, 132. rear needle bar hinge; 2. swing linkage servo motor, 21. needle frame left and right swing linkage rocker, 211. front needle frame swing transmission arm, 212. rear needle frame swing transmission arm; 3. front needle frame, 31. front needle frame connecting seat, 32. front needle frame longitudinal connecting block, 33. front needle frame longitudinal pull rod, 331. pull rod pin, 34. front needle frame swing connecting block, 35. front needle frame swing connecting rod, 36. front needle frame guide plate; 4. front needle bar, 41. front needle bar clamping piece, 411. front needle bar clamping piece connecting shaft , 42. front needle; 5. rear needle holder, 51. middle connecting section of rear needle holder, 52. bottom connecting section of rear needle holder, 53. swing connecting block of rear needle holder, 54. swing connecting rod of rear needle holder, 55. front guide block of rear needle holder, 56. rear guide block of rear needle holder; 6. rear needle bar, 61. rear needle bar chuck, 62. rear needle; 7. needle holder connecting bracket, 71. needle holder positioning groove, 72. needle holder fulcrum pin, 73. needle holder connecting joint bearing, 731. needle holder connecting joint bearing gasket; 8. needle bar linkage assembly, 81. needle bar linkage block, 811. needle bar linkage block connecting shaft, 82. needle bar linkage rod, 83. upper linkage joint bearing, 84. lower linkage joint bearing. DETAILED DESCRIPTION

[0020] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0021] In the following description, all concepts related to up, down, left, right, front and back directions or orientations are based on Figure 1 The positions shown are for reference only and thus cannot be understood as a special limitation on the technical solution provided by the present utility model.

[0022] See also Figure 1 and Figure 2, shows a sewing machine needle frame swing transmission mechanism, including: a main shaft 1, a swing linkage servo motor 2, a front needle frame 3, a front needle bar 4, a rear needle frame 5, a rear needle bar 6, a needle frame connecting bracket 7 and a needle bar linkage assembly 8; wherein the aforementioned main shaft 1 is transmission-connected with a power input source, a needle bar crank 11 is also installed at one end of the main shaft 1 in the longitudinal direction, and a front needle frame longitudinal driving cam 12 is mounted on the shaft body of the main shaft 1; the aforementioned front needle bar 4 is vertically arranged and fixedly mounted on the aforementioned The front needle holder 3 is provided on the front needle holder 3 and extends downward from the middle upper position of the front needle holder 3 and passes through the bottom of the front needle holder 3. The rear needle rod 6 is also vertically provided and fixedly mounted on the rear needle holder 5 and extends downward from the middle upper position of the rear needle holder 5 and passes through the bottom of the rear needle holder 5. The top of the front needle holder 3 and the top of the rear needle holder 5 are connected by a needle holder connecting bracket 7 and the tops of the two can be relatively rotated by the needle holder connecting bracket 7, and the front needle rod 4 and the rear needle rod 6 are connected. The linkage is realized through the needle bar linkage assembly 8; the front needle frame longitudinal driving cam 12 on the aforementioned main shaft 1 can drive the aforementioned front needle frame 3 to move forward through the transmission assembly, and the aforementioned swing linkage servo motor 2 is transmission-connected with the front needle frame 3 and the rear needle frame 5 and can drive the front needle frame 3 and the rear needle frame 5 to move left and right alternately, and realize the left and right alternating movement of the front needle bar 4 and the rear needle bar 6, and the needle bar crank 11 on the aforementioned main shaft 1 is transmission-connected with the aforementioned rear needle bar 6, and the aforementioned needle bar crank 11 can drive the rear needle bar 6 It is linked with the front needle bar 4 and realizes the up and down puncturing action, and under the transmission of the main shaft 1 and the swing linkage servo motor 2, the front needle bar 4 and the rear needle bar 6 can be linked to perform left and right alternating and up and down reciprocating puncturing actions, thereby realizing the sewing of shoe upper pattern stitches; it should be noted that: in this embodiment, driven by the aforementioned main shaft 1, the linkage servo motor 2 and the needle bar linkage assembly 8, the aforementioned front needle frame 3 can swing back and forth and left and right, while the rear needle frame 5 only swings left and right under the drive of the needle bar crank 11 of the main shaft 1.

[0023] Please continue to see Figure 1 The front needle holder 3 is vertically arranged and has a front needle holder connecting seat 31 formed at the middle and downward position in the height direction thereof. The front needle rod 4 is vertically penetrated in the front needle holder connecting seat 31 and passes downward through the bottom of the front needle holder connecting seat 31; and the rear needle holder 5 is also vertically arranged and has a rear needle holder middle connecting section 51 and a rear needle holder bottom connecting section 52 formed at the middle and bottom positions in the height direction respectively. The rear needle rod 6 passes through the rear needle holder middle connecting section 51 and the rear needle holder bottom connecting section 52 in sequence from top to bottom, and the rear needle rod 6 passes downward through the rear needle holder bottom connecting section 52.

[0024] In the present embodiment, a rear needle bar connecting rod 13 is also connected to the side position of the aforementioned needle bar crank 11 facing the aforementioned rear needle frame 5; wherein, a rear needle bar connecting rod pin 131 is formed at the top of the rear needle bar connecting rod 13, and the rear needle bar connecting rod pin 131 penetrates into the top part of the aforementioned needle bar crank 11 body and is locked and fixed with the needle bar crank 11, thereby realizing the positioning connection between the aforementioned rear needle bar connecting rod 13 and the needle bar crank 11; a rear needle bar hinge 132 is connected to the bottom of the aforementioned rear needle bar connecting rod 13, and a rear needle bar chuck 61 is fixedly mounted on the rod body of the rear needle bar 6, and the aforementioned rear needle bar chuck 61 can be cooperated and installed in the aforementioned rear needle bar hinge 132 and rotatably connected thereto, thereby realizing the hinge between the rear needle bar 6 and the aforementioned rear needle bar connecting rod 13.

[0025] Furthermore, a front needle stand longitudinal connecting block 32 is fixedly connected to the front needle stand connecting seat 31 of the aforementioned front needle stand 3 by fasteners, and a front needle stand longitudinal pull rod 33 is also arranged below the front needle stand longitudinal connecting block 32, and the front needle stand longitudinal pull rod 33 is connected to the aforementioned front needle stand longitudinal connecting block 32 by a pull rod pin 331; the front needle stand longitudinal driving cam 12 on the aforementioned main shaft 1 is connected to the front needle stand longitudinal pull rod 33 through a transmission arm assembly, so that the aforementioned front needle stand longitudinal driving cam 12 can drive the aforementioned front needle stand 3 to move forward.

[0026] Please continue to see Figure 1 A needle holder positioning groove 71 is formed on the needle holder connecting bracket 7, and the top ends of the front needle holder 3 and the rear needle holder 5 are both positioned and installed in the needle holder positioning groove 71, and a needle holder fulcrum pin 72 is also penetrated in the needle holder connecting bracket 7, and the needle holder fulcrum pin 72 passes through the top ends of the front needle holder 3 and the rear needle holder 5 in turn and realizes the connection between the two, and a needle holder connecting joint bearing 73 is also arranged between the needle holder fulcrum pin 72 and the matching hole of the front needle holder 3, and the needle holder connecting joint bearing 73 is used to realize the support and positioning of the needle holder fulcrum pin 72, and the needle holder connecting joint bearing 73 can make the front needle holder 3 and the needle holder fulcrum pin 72 rotatably connected together, and can realize the relative rotation between the front needle holder 3 and the rear needle holder 5, and a needle holder connecting joint bearing washer 731 is also arranged on one side of the needle holder connecting joint bearing 73, and the needle holder connecting joint bearing washer 731 passes through the needle holder connecting bracket 7 body and is sleeved on the needle holder fulcrum pin 72.

[0027] In this embodiment, the needle bar linkage assembly 8 includes a needle bar linkage block 81, a needle bar linkage rod 82, an upper linkage joint bearing 83 and a lower linkage joint bearing 84; the needle bar linkage block 81 is locked and fixed to the top end of the rear needle bar 6 by a fastener, and a needle bar linkage block connecting shaft 811 is also convexly provided on the needle bar linkage block 81, and the upper linkage joint bearing 83 and the lower linkage joint bearing 84 are respectively installed at the upper and lower ends of the needle bar linkage rod 82, and are also fastened on the rod body of the front needle bar 4. A front needle bar chuck member 41 is locked and fixed on the front needle bar chuck member 41, and a front needle bar chuck member connecting shaft 411 is also convexly formed on the front needle bar chuck member 41. The aforementioned needle bar linkage block connecting shaft 811 penetrates into the aforementioned upper linkage joint bearing 83 and realizes transmission connection therewith, while the aforementioned front needle bar chuck member connecting shaft 411 penetrates into the aforementioned lower linkage joint bearing 84 and realizes transmission connection therewith, thereby realizing the transmission connection between the needle bar linkage block 81, the needle bar linkage rod 82 and the front needle bar chuck member 41, so that the front needle bar 4 and the rear needle bar 6 can be linked.

[0028] Further, a needle holder left-right swing linkage rocker arm 21 is connected to the power output shaft of the aforementioned swing linkage servo motor 2, and a front needle holder swing transmission arm 211 is formed on the upper part of the needle holder left-right swing linkage rocker arm 21, and a rear needle holder swing transmission arm 212 is formed on the lower part of the needle holder left-right swing linkage rocker arm 21; and a front needle holder swing connecting block 34 is formed on the aforementioned front needle holder 3, and a front needle holder swing connecting rod 35 is provided on the front needle holder swing connecting block 34, one end portion of the front needle holder swing connecting rod 35 in the length direction is hinged to the aforementioned front needle holder swing connecting block 34 through a connecting pin, and the other end portion of the front needle holder swing connecting rod 35 in the length direction It is hinged to the aforementioned front needle holder swing transmission arm 211 through a connecting pin, thereby realizing the transmission connection between the front needle holder swing transmission arm 211 and the front needle holder 3; and a rear needle holder swing connecting block 53 is also formed on the bottom part of the aforementioned rear needle holder 5, and a rear needle holder swing connecting rod 54 is provided on the rear needle holder swing connecting block 53, one end of the rear needle holder swing connecting rod 54 in the length direction is hinged to the aforementioned rear needle holder swing connecting block 53 through a connecting pin, and the other end of the rear needle holder swing connecting rod 54 in the length direction is hinged to the aforementioned rear needle holder swing transmission arm 212 through a connecting pin, thereby realizing the transmission connection between the rear needle holder swing transmission arm 212 and the rear needle holder 5.

[0029] In this embodiment, a front needle 42 is connected to the bottom end of the front needle rod 4, and a rear needle 62 is connected to the bottom end of the rear needle rod 6. The front needle 42 and the rear needle 62 are used together to sew pattern stitches on the shoe upper.

[0030] Preferably, a front needle holder guide plate 36 is fixedly connected to the lower middle part of the front needle holder 3 body by a fastener, and the front needle holder guide plate 36 is vertically arranged.

[0031] Furthermore, a rear needle holder front guide block 55 is installed at the bottom end of the aforementioned rear needle holder 5 body, and a rear needle holder rear guide block 56 is also provided at the lower position of the rear needle holder 5. The aforementioned rear needle holder front guide block 55 and the rear needle holder rear guide block 56 are used to limit the forward and backward movement of the aforementioned rear needle holder 5.

[0032] See also Figure 1 Combined with Figure 2 The applicant briefly describes the working principle of the technical solution provided by the utility model: First, the operator places the shoe upper sleeve on the needle plate of the double-needle upper pattern sewing machine, and the operator further drives the main shaft 1 to rotate, and the main shaft 1 further drives the front needle frame longitudinal driving cam 12 thereon to rotate, and the front needle frame longitudinal driving cam 12 drives the front needle frame longitudinal pull rod 33 to move through the transmission arm assembly and drives the pull rod pin 331 and the front needle frame longitudinal connecting block 32 to drive the front needle frame 3 to move forward, and the front needle frame 3 then drives the front needle bar 4 to move At the same time, the swing linkage servo motor 2 receives the control signal and starts working, and its power output shaft works and drives the needle holder left and right swing linkage rocker arm 21 to move, and the front needle holder swing transmission arm 211 at the upper part of the needle holder left and right swing linkage rocker arm 21 further drives the front needle holder 3 to swing through the front needle holder swing connecting rod 35, and the rear needle holder swing transmission arm 212 at the lower part of the needle holder left and right swing linkage rocker arm 21 further drives the rear needle holder 5 to swing through the rear needle holder swing connecting rod 54, so that the front needle holder 3 and the rear needle holder 5 are driven respectively. The front needle bar 4 and the rear needle bar 5 thereon perform a left-right linkage action, and then the front needle holder 3 pushes forward to complete the left-right alternating action of the front needle bar 4 and the rear needle bar 5; at the same time, during the rotation of the main shaft 1, it can further drive the needle bar crank 11 to rotate, and the needle bar crank 11 further drives the rear needle bar 6 body to perform an up and down puncture action through the transmission of the rear needle bar connecting rod 13 body, the rear needle bar hinge 132 and the rear needle bar chuck 61, and the rear needle bar 6 further drives the needle bar linkage block 81 and the needle bar linkage rod 8 2 and the front needle bar clamping member 41 move, and finally realize the up and down puncturing action of the front needle bar 4 body. In addition, in this process, the aforementioned swing linkage servo motor 2 can realize the control of the left, middle, right and lower puncturing positions of the front needle bar 4 and the rear needle bar 6 by controlling the swing amplitude of the left and right swing linkage rocker member 21 of the needle holder, thereby finally making the front needle bar 4 body together with the front needle 42 and the rear needle bar 6 body together with the rear needle 62 can be driven by the above-mentioned action, and further cooperate with the shuttle set in the sewing machine base to sew the shoe upper as shown in the figure. Figure 2 The pattern stitch shown in .

[0033] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

[0034] In summary, the technical solution provided by the utility model makes up for the shortcomings of the existing technology, successfully completes the utility model task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A sewing machine needle frame swing transmission mechanism, characterized in that: include: A main shaft (1), a swing linkage servo motor (2), a front needle frame (3), a front needle bar (4), a rear needle frame (5), a rear needle bar (6), a needle frame connecting bracket (7) and a needle bar linkage assembly (8); wherein the main shaft (1) is transmission-connected with a power input source, a needle bar crank (11) is mounted on one end of the main shaft (1) in the longitudinal direction, and a front needle frame longitudinal driving cam (12) is mounted on the main shaft (1); the front needle bar (4 ) is fixedly arranged on the front needle frame (3) and extends downward from a position slightly above the middle of the front needle frame (3) and passes through the bottom of the front needle frame (3); the rear needle rod (6) is also fixedly arranged on the rear needle frame (5) and extends downward from a position slightly above the middle of the rear needle frame (5) and passes through the bottom of the rear needle frame (5); the top end of the front needle frame (3) and the top end of the rear needle frame (5) are connected via a needle frame connecting bracket (7) and the top ends of the two can be connected via the needle frame connecting bracket. The front needle holder (4) and the rear needle holder (6) are connected to each other to realize relative rotation, and the front needle holder (4) and the rear needle holder (6) are linked by a needle holder linkage assembly (8); the front needle holder longitudinal driving cam (12) on the main shaft (1) can drive the front needle holder (3) to move forward through a transmission assembly, and the swing linkage servo motor (2) is connected to the front needle holder (3) and the rear needle holder (5) to realize transmission connection and can drive the front needle holder (3) and the rear needle holder (5) to perform left and right alternating movements, thereby realizing the front needle holder (4 ) and the rear needle bar (6) alternately move left and right, and the needle bar crank (11) on the main shaft (1) is connected to the rear needle bar (6) in transmission, and the needle bar crank (11) can drive the rear needle bar (6) to be linked with the front needle bar (4) and realize the up and down piercing action, and under the transmission of the main shaft (1) and the swing linkage servo motor (2), the front needle bar (4) and the rear needle bar (6) can be linked to perform left and right alternation and up and down reciprocating piercing action, thereby realizing the sewing of the shoe upper pattern stitch.

2. A sewing machine needle frame swing transmission mechanism according to claim 1, characterized in that: The front needle holder (3) is vertically arranged and a front needle holder connecting seat (31) is formed at a position downward from the middle of the height direction. The front needle rod (4) is vertically inserted into the front needle holder connecting seat (31) and passes downward through the bottom of the front needle holder connecting seat (31). The rear needle holder (5) is also vertically arranged and a rear needle holder middle connecting section (51) and a rear needle holder bottom connecting section (52) are formed at the middle and bottom positions of the height direction, respectively. The rear needle rod (6) passes through the rear needle holder middle connecting section (51) and the rear needle holder bottom connecting section (52) in sequence from top to bottom, and the rear needle rod (6) passes downward through the rear needle holder bottom connecting section (52).

3. A sewing machine needle frame swing transmission mechanism according to claim 2, characterized in that: A rear needle bar connecting rod (13) is also connected to a side position of the needle bar crank (11) facing the rear needle frame (5); wherein a rear needle bar connecting rod pin (131) is formed at the top of the rear needle bar connecting rod (13), and the rear needle bar connecting rod pin (131) penetrates into the top part of the needle bar crank (11) body and is locked and fixed with the needle bar crank (11), thereby realizing the positioning connection between the rear needle bar connecting rod (13) and the needle bar crank (11); a rear needle bar hinge (132) is connected to the bottom of the rear needle bar connecting rod (13), and a rear needle bar chuck (61) is fixedly mounted on the rod body of the rear needle bar (6), and the rear needle bar chuck (61) can be mounted in the rear needle bar hinge (132) and rotatably connected thereto, thereby realizing the hinge connection between the rear needle bar (6) and the rear needle bar connecting rod (13).

4. A sewing machine needle frame swing transmission mechanism according to claim 2, characterized in that: A front needle frame longitudinal connecting block (32) is fixedly connected to the front needle frame connecting seat (31) of the front needle frame (3) by means of a fastener, and a front needle frame longitudinal pulling rod (33) is arranged below the front needle frame longitudinal connecting block (32), and the front needle frame longitudinal pulling rod (33) is connected to the front needle frame longitudinal connecting block (32) by means of a pulling rod pin (331); the front needle frame longitudinal driving cam (12) on the main shaft (1) is connected to the front needle frame longitudinal pulling rod (33) by means of a transmission arm assembly, so that the front needle frame longitudinal driving cam (12) can drive the front needle frame (3) to move forward.

5. The sewing machine needle frame swing transmission mechanism according to claim 1, characterized in that: A needle holder positioning groove (71) is formed on the needle holder connecting bracket (7), and the top ends of the front needle holder (3) and the rear needle holder (5) are both positioned and installed in the needle holder positioning groove (71), and a needle holder fulcrum pin (72) is also penetrated in the needle holder connecting bracket (7), and the needle holder fulcrum pin (72) passes through the top ends of the front needle holder (3) and the rear needle holder (5) in sequence to realize the connection between the two, and a needle holder connecting joint bearing (73) is also arranged between the needle holder fulcrum pin (72) and the matching hole of the front needle holder (3). The connecting joint bearing (73) is used to support and position the needle frame fulcrum pin (72), and the needle frame connecting joint bearing (73) can make the front needle frame (3) and the needle frame fulcrum pin (72) rotatably connected together, and can realize the relative rotation between the front needle frame (3) and the rear needle frame (5), and a needle frame connecting joint bearing washer (731) is also provided on one side of the needle frame connecting joint bearing (73), and the needle frame connecting joint bearing washer (731) passes through the needle frame connecting bracket (7) body and is mounted on the needle frame fulcrum pin (72).

6. A sewing machine needle frame swing transmission mechanism according to claim 1, characterized in that: The needle bar linkage assembly (8) includes a needle bar linkage block (81), a needle bar linkage rod (82), an upper linkage joint bearing (83) and a lower linkage joint bearing (84); the needle bar linkage block (81) is locked and fixed to the top end of the rear needle bar (6) by a fastener, and a needle bar linkage block connecting shaft (811) is also convexly provided on the needle bar linkage block (81), and the upper linkage joint bearing (83) and the lower linkage joint bearing (84) are respectively installed at the upper and lower ends of the needle bar linkage rod (82), and are also locked on the rod body of the front needle bar (4) by a fastener. A front needle bar chuck member (41) is fixed, and a front needle bar chuck member connecting shaft (411) is also convexly formed on the front needle bar chuck member (41). The needle bar linkage block connecting shaft (811) penetrates into the upper linkage joint bearing (83) and realizes transmission connection therewith, while the front needle bar chuck member connecting shaft (411) penetrates into the lower linkage joint bearing (84) and realizes transmission connection therewith, thereby realizing transmission connection between the needle bar linkage block (81), the needle bar linkage rod (82) and the front needle bar chuck member (41), so that the front needle bar (4) and the rear needle bar (6) can realize linkage.

7. The sewing machine needle frame swing transmission mechanism according to claim 1, characterized in that: A needle holder left-right swing linkage rocker arm (21) is connected to the power output shaft of the swing linkage servo motor (2), and a front needle holder swing transmission arm (211) is formed on the upper part of the needle holder left-right swing linkage rocker arm (21), and a rear needle holder swing transmission arm (212) is formed on the lower part of the needle holder left-right swing linkage rocker arm (21); a front needle holder swing connection block (34) is formed on the front needle holder (3), and a front needle holder swing connection rod (35) is arranged on the front needle holder swing connection block (34), one end of the front needle holder swing connection rod (35) in the length direction is hinged to the front needle holder swing connection block (34) through a connecting pin, and the other end of the front needle holder swing connection rod (35) in the length direction is hinged to the front needle holder swing connection block (34) through a connecting pin, and the other end of the front needle holder swing connection rod (35) in the length direction is hinged to the The front needle holder swing transmission arm (211) is hinged via a connecting pin, thereby realizing the transmission connection between the front needle holder swing transmission arm (211) and the front needle holder (3); and a rear needle holder swing connection block (53) is also formed on the bottom portion of the rear needle holder (5), and a rear needle holder swing connection rod (54) is provided on the rear needle holder swing connection block (53), one end of the rear needle holder swing connection rod (54) in the length direction is hinged to the rear needle holder swing connection block (53) via a connecting pin, and the other end of the rear needle holder swing connection rod (54) in the length direction is hinged to the rear needle holder swing transmission arm (212) via a connecting pin, thereby realizing the transmission connection between the rear needle holder swing transmission arm (212) and the rear needle holder (5).

8. The sewing machine needle frame swing transmission mechanism according to claim 1, characterized in that: A front needle (42) is connected to the bottom end of the front needle rod (4), and a rear needle (62) is connected to the bottom end of the rear needle rod (6). The front needle (42) and the rear needle (62) cooperate to sew pattern stitches on the shoe upper.

9. The sewing machine needle frame swing transmission mechanism according to claim 1, characterized in that: A front needle holder guide plate (36) is fixedly connected to the lower middle portion of the front needle holder (3) body via a fastener, and the front needle holder guide plate (36) is arranged vertically.

10. The sewing machine needle frame swing transmission mechanism according to claim 1, characterized in that: A rear needle holder front guide block (55) is installed at the bottom end of the rear needle holder (5) body, and a rear needle holder rear guide block (56) is also arranged below the rear needle holder (5). The rear needle holder front guide block (55) and the rear needle holder rear guide block (56) are used to limit the forward and backward movement of the rear needle holder (5).

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