Electrically-controlled needle frame swing transmission device of double-needle sewing machine

Abstract

An electrically-controlled needle frame swing transmission device of a double-needle sewing machine comprises a front needle frame and a rear needle frame, a front needle rod and a rear needle rod are arranged in the front needle frame and the rear needle frame in a penetrating mode respectively, and the front needle frame and the rear needle frame are in transmission connection through a needle frame connecting rod assembly; the main driving unit is used for driving the front needle frame and the rear needle frame to reciprocate up and down; the needle frame swinging unit is used for driving the front needle frame and the rear needle frame to perform swinging actions in opposite left and right directions; the front needle frame front-back driving unit is in dynamic coupling connection with the main driving unit and is in transmission fit with the front needle frame; the gear shifting control mechanism unit can enable the front needle frame to move forwards greatly relative to the initial position so as to enable the front needle rod to enter a neutral position state; the feeding unit is used for conveying needle and thread materials; the double-needle sewing machine has the advantages that through precise design and electric control, reliable switching between a double-needle frame cooperative work mode and a single-needle frame neutral position mode of the double-needle sewing machine is achieved, sewing of rich pattern stitches is achieved, and efficient and stable operation in a multi-station sewing scene is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the technical field of bag sewing equipment, specifically relating to an electrically controlled double-needle sewing machine needle holder swing transmission device. Background Technology

[0002] Existing double-needle sewing machines are industrial or household sewing devices equipped with two needles. Through the coordinated movement of the two needles and the use of a rotary hook to hook the thread, two parallel and neat stitches are formed. Compared to single-needle sewing machines, the stitches are more regular and can achieve double-thread parallel lockstitch. They are mainly used in scenarios requiring reinforcement, decoration, or special stitch effects. By sewing with two needles simultaneously, the repetitive operation of single-needle sewing is reduced, making them suitable for mass production in industries such as clothing, bags, and footwear. However, the needle holder oscillation transmission device of existing double-needle sewing machines generally relies on mechanical cams and crank linkage mechanisms to control the needle bar movement. Its structure drives the front needle holder to move longitudinally through a main shaft cam, while the oscillation motor drives the front and rear needle holders to oscillate alternately to drive the needle bar to sew patterned stitches. However, the needle spacing adjustment requires changing cams with different curvatures, resulting in limited pattern types and cumbersome operation. Furthermore, the oscillation action of the double needle holder is usually driven by a single cam or motor, making it difficult to achieve precise reverse synchronous movement of the two needle holders. When adjustments to the stitches are needed, the machine must be stopped and the cam manually replaced or the crank length adjusted. Real-time pattern switching is not possible, resulting in low adjustment efficiency. At the same time, the needle holder swing transmission device of the existing double needle sewing machine has insufficient pattern diversity and functional expandability. The traditional cam mechanism can only generate preset fixed trajectories (such as straight lines and arcs), and cannot realize complex patterns such as "I" shapes. The variety of patterns is limited, which cannot meet the decorative needs of complex products such as shoes and bags.

[0003] In view of the above, it is necessary to make reasonable improvements to the existing electrically controlled needle carriage oscillation transmission device of the double-needle sewing machine. To this end, the applicant has made a beneficial design, and the technical solution described below arises from this background. Utility Model Content

[0004] The objective of this invention is to provide an electrically controlled double-needle sewing machine needle carriage swing transmission device with editable patterns, compact structure, and stable and reliable operation. This device helps to achieve coordinated control through optimized transmission structure and realize fully electric drive for needle carriage swing, needle spacing adjustment, and neutral switching. It also facilitates the realization of richer pattern combinations by seamlessly switching between double-needle carriage coordinated work and single-needle carriage neutral mode.

[0005] The present invention achieves its objective as follows: an electrically controlled needle holder oscillation transmission device for a double-needle sewing machine, comprising: a front needle holder and a rear needle holder, wherein a front needle bar is installed inside the front needle holder, and a rear needle bar is installed inside the rear needle holder, and the front and rear needle holders are connected by a needle holder connecting rod assembly; a main drive unit, which drives the front and rear needle holders to perform reciprocating motion in the up-down direction and drives the front and rear needle bars to perform synchronous up-down reciprocating motion; and a needle holder oscillation unit, which drives the front and rear needle holders. The device performs a swinging motion in opposite left and right directions; a front needle holder front and rear drive unit, which is poweredly coupled to the main drive unit, and is driven by the front needle holder pull rod to drive the front needle holder to perform a reciprocating motion in the front and rear directions; a shift control mechanism unit, which can drive the front needle holder pull rod to move the front needle holder forward significantly relative to its initial position, so that the front needle rod enters a neutral state; and a feeding unit, which is used to feed needle thread and keeps synchronized with the swinging motion of the front and rear needle holders.

[0006] In a specific embodiment of this utility model, the needle holder connecting rod assembly includes a needle holder connecting pin, a needle holder support, and a needle bar connecting rod. The needle holder support is positioned at the front of the top of the front needle holder. One end of the needle holder connecting pin is fitted onto the top of the rear needle holder, and the other end of the connecting pin passes through the top of the front needle holder and is mounted on the needle holder support. The connecting pin rotates with the front needle holder via a universal bearing. A front needle bar clamp is installed at a position slightly below the middle of the front needle bar's height, and a rear needle bar clamp is installed at the top of the rear needle bar. The top end of the needle bar connecting rod is fitted onto the rear needle bar clamp and rotates with it, while the bottom end of the connecting rod is fitted onto the front needle bar clamp and also rotates with it, thus achieving a rotational connection between the front and rear needle bars.

[0007] In another specific embodiment of this utility model, the main drive unit includes a main motor, a main drive shaft, a drive gear, a drive crank, and a drive connecting rod. One end of the main drive shaft along its length is connected to the output power shaft of the main motor via a connecting sleeve. The drive gear is mounted on the shaft of the main drive shaft and is power-coupled to the front and rear drive units of the front needle holder. The drive crank is fixedly installed at the other end of the main drive shaft away from the main motor. One end of the drive connecting rod is fitted with the drive crank via a connecting pin. A rear needle rod connector is installed at a position slightly below the middle of the rear needle rod's height. The other end of the drive connecting rod away from the drive crank is fitted with this rear needle rod connector, thereby achieving a transmission connection between the drive crank and the rear needle rod.

[0008] In another specific embodiment of this utility model, the front needle holder front and rear drive unit further includes a driven gear, a front needle holder front and rear movement cam, a roller, a push rod, and a push rod connecting plate; wherein, the driven gear is connected to the driving gear of the main drive unit through gear meshing transmission; the front needle holder front and rear movement cam is disposed on one side of the driving gear and can rotate under the drive of the driven gear; the front needle holder front and rear movement cam can drive the roller to move; the rear part of the push rod is fixedly connected to the roller, and the roller can drive the push rod to move back and forth; the push rod connecting plate is fixedly connected to the front end of the push rod, and the push rod connecting plate is also fixedly connected to the rear end of the front needle holder pull rod by fasteners.

[0009] In another specific embodiment of this utility model, a passive gear pivot pin is provided at the center of the passive gear, and the front needle holder front-back action cam is fitted on the passive gear pivot pin to achieve its own radial positioning; a pair of front needle holder front-back action cam drive blocks are also formed on the side surface of the front needle holder front-back action cam facing the passive gear, and the front needle holder front-back action cam drive blocks pass forward through the passive gear and can contact the roller to drive the roller to move; a push rod rear connecting sleeve is also formed at the rear end of the push rod body, and the roller is fitted in the push rod rear connecting sleeve and fixedly connected to the push rod rear connecting sleeve by a roller connecting pin; a push rod sleeve is also fitted at the front of the push rod body, and a push rod spring is provided in the push rod sleeve to abut against the push rod sleeve and the push rod body; the push rod connecting plate passes through the push rod sleeve and the rear end of the push rod connecting plate is fitted into the front of the push rod, and the push rod connecting plate and the push rod body are fixedly installed by a fixing bolt.

[0010] In another specific embodiment of this utility model, a front needle frame connecting block is fixedly installed at the lower end of the front surface of the front needle frame. The front needle frame pull rod of the front needle frame front and rear drive unit is connected to the front needle frame connecting block through a front needle frame connecting pin, so that the front needle frame pull rod can perform reciprocating motion in the front and rear directions.

[0011] In a further specific embodiment of this utility model, the needle holder swing unit includes a needle holder swing motor, a swing shaft, a swing transmission component, a front needle holder swing connecting rod, and a rear needle holder swing connecting rod. The needle holder swing motor is fixedly mounted on the sewing machine frame. One end of the swing shaft is connected to the power output shaft of the needle holder swing motor via a motor connecting sleeve. The swing transmission component is fixedly mounted on the other end of the swing shaft, away from the needle holder swing motor. One end of the front needle holder swing connecting rod is rotatably engaged with the swing transmission component, and the other end is rotatably engaged with the front needle holder frame, thus achieving a rotatable connection between the swing transmission component and the front needle holder. One end of the rear needle holder swing connecting rod is connected to the swing transmission component via an eccentric pin, and the other end is connected to the bottom of the rear needle holder via a connecting pin, thus achieving a rotatable connection between the swing transmission component and the rear needle holder.

[0012] In a further specific embodiment of this utility model, the shift control mechanism unit includes a cylinder, a cylinder bracket, a cylinder top pin, and a neutral block; wherein, the cylinder is fixedly mounted on the frame of the sewing machine via the cylinder bracket, the cylinder top pin is mounted on the telescopic rod of the cylinder, the top part of the neutral block is fitted together with the cylinder top pin, and the bottom part of the neutral block is fixedly mounted together with the front needle frame pull rod of the front needle frame front and rear drive unit via fasteners, thereby enabling the cylinder to drive the front needle frame pull rod to perform reciprocating motion in the front and rear directions.

[0013] In yet another specific embodiment of this utility model, the feeding unit includes a feeding motor, a feeding crank, a rear universal joint connecting rod, a front universal joint connecting rod, a slide rod, a feeding tooth connecting rod, a feeding tooth, and a needle plate; wherein, the feeding motor is fixedly mounted on the sewing machine's worktable, the feeding crank is mounted on the power output shaft of the feeding motor, the rear end of the rear universal joint connecting rod is fitted together with the feeding crank, and the front universal joint connecting rod is connected to the front end of the rear universal joint connecting rod for transmission. The front universal connecting rod is rotatably connected to the slide rod via a connecting pin. A slide rod connecting plate is also provided on the slide rod, and the slide rod is fixedly connected to the rear end of the feed dog connecting rod via the slide rod connecting plate. The feed dog is installed at the front end of the feed dog connecting rod, and the needle plate is fixedly installed on the feed dog. The needle plate is located directly below the front needle bar and the rear needle bar. The feed dog and the needle plate can cooperate with the front needle bar and the rear needle bar to perform pattern stitch sewing.

[0014] The beneficial effects of this utility model are as follows: First, this technical solution achieves electric control and programmed adjustment of the entire system by optimizing the main drive unit, needle carriage swing unit, and front needle carriage swing unit. Through coordinated control, it realizes fully electric drive for needle carriage swing, needle spacing adjustment, and neutral switching, replacing the traditional mechanical cam structure. Compared with the existing technology that requires manual cam replacement for needle spacing adjustment, the work efficiency is greatly improved, effectively enhancing the automation level of the double-needle sewing machine. Second, through the shift control mechanism unit's motion control of the front needle carriage, this technical solution can seamlessly switch between double-needle carriage collaborative work and single-needle carriage neutral mode, solving the contradiction that traditional sewing machines cannot simultaneously meet the requirements of "multiple needle spacing continuous adjustment" and "multiple needle points on the left, center, and right." It enables the sewing of rich pattern stitches and the adjustment of any left, center, and right spacing size within the machine head range, which has significant promotional value. Attached Figure Description

[0015] Figure 1 This is an exploded view of the overall structure of this utility model;

[0016] Figure 2 This is a plan view of the present invention;

[0017] Figure 3 This is a schematic diagram showing the front needle holder and the rear needle holder working together to create the pattern in this utility model.

[0018] Figure 4 This is a schematic diagram of the rear needle holder performing pattern sewing when the front needle holder is in an unattended state in this utility model.

[0019] In the diagram: 1. Front needle holder, 11. Front needle bar, 111. Front needle bar clamp, 12. Front needle holder connecting block; 2. Rear needle holder, 21. Rear needle bar, 211. Rear needle bar clamp, 212. Rear needle bar connector; 3. Needle holder connecting rod assembly, 31. Needle holder connecting pin, 311. Needle holder connecting pin universal bearing, 32. Needle holder support, 33. Needle bar connecting rod assembly; 4. Main drive unit, 41. Main motor, 42. Main drive shaft, 421. Connecting sleeve, 43. Drive gear, 44. Drive crank, 45. Drive connecting rod; 5. Needle holder swing unit, 51. Needle holder swing motor, 52. Swing shaft, 53. Swing transmission component, 54. Front needle holder swing connecting rod, 55. Rear needle holder swing connecting rod, 551. Eccentric pin; 6. Front and rear drive units of the front needle holder, 6 1. Front needle holder pull rod; 611. Front needle holder connecting pin; 62. Driven gear; 621. Driven gear pivot pin; 63. Front needle holder forward and backward movement cam; 631. Front needle holder forward and backward movement cam drive block; 64. Roller; 641. Roller connecting pin; 65. Push rod; 651. Push rod rear connecting sleeve; 652. Push rod spring; 66. Push rod connecting plate; 67. Push rod sleeve; 7. Gear shifting control mechanism unit; 71. Cylinder; 72. Cylinder bracket; 73. Cylinder top pin; 74. Neutral top block; 8. Feeding unit; 81. Feeding motor; 82. Feeding crank; 83. Rear universal connecting rod; 84. Front universal connecting rod; 85. Slide rod; 851. Slide rod connecting plate; 86. Feeding tooth connecting rod; 87. Feeding tooth; 88. Needle plate. Detailed Implementation

[0020] The following will provide a detailed description by way of embodiments. However, the description of the embodiments is not intended to limit the present utility model. Any formal but not substantive equivalent transformations made based on the present utility model concept should be considered within the scope of the present utility model's technical solution.

[0021] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back refer to the current situation. Figure 1 The description pertains to the location and state of the object, and therefore should not be construed as a specific limitation on the technical solution provided by this utility model.

[0022] Please see Figure 1 and Figure 2 A electrically controlled needle holder oscillation transmission device for a double-needle sewing machine is characterized by comprising a front needle holder 1 and a rear needle holder 2, both vertically arranged. A front needle bar 11 is installed inside the front needle holder 1, and a rear needle bar 21 is installed inside the rear needle holder 2. The front needle holder 1 and the rear needle holder 2 are connected by a needle holder connecting rod assembly 3. The linkage design of the front needle holder 1 and the rear needle holder 2 ensures the synchronization of the movement trajectories of the two needle bars, avoids stitch deviation caused by unilateral drive, and improves sewing accuracy.

[0023] The diagram also shows a main drive unit 4, which drives the front needle holder 1 and the rear needle holder 2 to perform reciprocating motion in the up-down direction and drives the front needle bar 11 and the rear needle bar 21 to perform synchronous up-down reciprocating motion; a needle holder swing unit 5, which drives the front needle holder 1 and the rear needle holder 2 to perform swing motion in opposite left-right directions; a front needle holder front-back drive unit 6, which is power-coupled to the main drive unit 4 and is driven by the front needle holder pull rod 61 to drive the front needle holder 1 to perform reciprocating motion in the front-back direction; a shift control mechanism unit 7, which drives the front needle holder pull rod 61 to move the front needle holder 1 forward significantly relative to its initial position so that the front needle bar 11 enters a neutral state; and a feeding unit 8, which feeds needle thread material and keeps synchronized with the swing motion of the front needle holder 1 and the rear needle holder 2. This technical solution realizes a multi-unit collaborative workflow. When the double-needle sewing cycle starts, the main drive unit begins to work, and the front needle bar 11 and the rear needle bar 21 simultaneously puncture up and down. At the same time, the needle frame swing unit 5 drives both to swing left and right, forming a basic stitch. The front needle frame front and rear drive unit 6 adjusts and drives the front needle frame 1 to move back and forth according to sewing requirements to change the stitch length. The shift control mechanism 7 can drive the front needle frame 1 forward to put it into neutral, allowing the aforementioned rear needle bar 21 to insert the needle at any position in the left, center, or right of the machine head space. In addition, the feeding unit 8 controls the moving speed and stroke of the feed dog 87 according to the preset stitch, cooperating with the front needle frame 1 and the rear needle frame 2 to form complex stitches.

[0024] In this embodiment, the aforementioned needle carriage connecting rod assembly 3 includes a needle carriage connecting pin 31, a needle carriage support 32, and a needle bar connecting rod 33. The needle carriage support 32 is positioned at the front of the top of the aforementioned front needle carriage 1. One end of the aforementioned needle carriage connecting pin 31 is fitted onto the top of the aforementioned rear needle carriage 2, and the other end of the needle carriage connecting pin 31 passes through the top of the aforementioned front needle carriage 1 and is fitted onto the aforementioned needle carriage support 32. The needle carriage connecting pin 31 achieves rotational engagement with the front needle carriage 1 via a needle carriage connecting pin universal bearing 311. A front needle bar clamp 111 is installed at a position slightly below the middle of the height of the aforementioned front needle bar 11, and a rear needle bar clamp 211 is installed at the top end of the aforementioned rear needle bar 21. The aforementioned needle bar connecting rod... The top end of component 33 is fitted onto the aforementioned rear needle bar clamp 211 and rotates with it, while the bottom end of the needle bar connecting component 33 is fitted onto the aforementioned front needle bar clamp 111 and also rotates with it, thereby achieving a rotational connection between the front needle bar 11 and the rear needle bar 21. Through the rotational connection of the needle bar connecting component 33, the movement of the front needle bar 11 and the rear needle bar 21 is associated, and a reliable connection between the two needle bars is achieved through the universal bearing and rotational engagement. This enables the two needle bars to move synchronously in the vertical direction driven by the main drive unit 4 and to swing in opposite directions in the horizontal direction driven by the needle frame swing unit 5. This ensures the synchronicity of the two needle bars during high-speed sewing, avoids stitch misalignment, and the universal bearing allows the needle bars to freely adjust their angle during swinging, reducing transmission friction and mechanical stress, and extending the life of the components.

[0025] Furthermore, the aforementioned main drive unit 4 includes a main motor 41, a main drive shaft 42, a drive gear 43, a drive crank 44, and a drive connecting rod 45. One end of the main drive shaft 42 along its length is connected to the output power shaft of the main motor 41 via a connecting sleeve 421. The drive gear 43 is mounted on the shaft of the main drive shaft 42 and is power-coupled to the front needle holder front and rear drive units 6. The drive crank 44 is fixedly mounted at the other end of the main drive shaft 42 away from the main motor 41. One end of the drive connecting rod 45 is connected to the drive crank 44 via a connecting pin. The rear needle bar 21 is fitted with a connecting piece 212 located slightly below the center of its height. The other end of the drive linkage 45, away from the drive crank 44, engages with this connecting piece 212, thus establishing a transmission connection between the drive crank 44 and the rear needle bar 21. The main motor 41 drives the main drive shaft 42 to rotate, converting the rotational motion into the reciprocating motion of the rear needle bar 21 through the transmission between the drive crank 44 and the drive linkage 45. Simultaneously, the drive gear 43 transmits power to the front needle holder front and rear drive units 6 via meshing, thereby driving the front needle holder 1 to move back and forth. This gear-crank-connecting rod combination efficiently converts rotational motion into linear motion, reducing energy loss, achieving efficient power transmission, ensuring phase synchronization of the two needle movements, and enabling precise control of complex stitches (such as overlock stitching and decorative seams).

[0026] Please continue reading Figure 1 and Figure 2 The aforementioned front needle carriage drive unit 6 further includes a driven gear 62, a front needle carriage forward and backward movement cam 63, a roller 64, a push rod 65, and a push rod connecting plate 66. The driven gear 62 is engaged with the drive gear 43 of the main drive unit 4. The front needle carriage forward and backward movement cam 63 is positioned on one side of the drive gear 62 and can rotate under the drive of the driven gear 62. The front needle carriage forward and backward movement cam 63 can drive the roller 64 to move. The roller 64 is connected to the front needle carriage... The point contact design of the forward and backward action cam 63 reduces mechanical vibration and ensures the uniformity of the stitch when the needle pitch changes; the rear part of the aforementioned push rod 65 is fixedly connected to the aforementioned roller 64, and the aforementioned roller 64 can drive the aforementioned push rod 65 to move back and forth; the aforementioned push rod connecting plate 66 is fixedly connected to the front end of the push rod 65, and the push rod connecting plate 66 is also fixedly connected to the rear end of the aforementioned front needle holder pull rod 61 by fasteners; the aforementioned front needle holder forward and backward drive unit 6 achieves precise forward and backward displacement of the front needle holder 1 through gear meshing and cam mechanism.

[0027] Furthermore, a passive gear pivot pin 621 is inserted at the center of the aforementioned passive gear 62, and the aforementioned front needle holder forward and backward movement cam 63 is fitted onto the passive gear pivot pin 621 to achieve its radial positioning; on the surface of the aforementioned front needle holder forward and backward movement cam 63 facing the aforementioned passive gear 62, a pair of front needle holder forward and backward movement cam drive blocks 631 are also formed, which pass forward through the aforementioned passive gear 62 and can contact the roller 64 to drive the roller 64 to move; at the rear end of the aforementioned push rod 65, a push rod rear connecting sleeve 651 is also formed, and the aforementioned roller 64 is fitted into the push rod rear connecting sleeve 651 and fixedly connected to the push rod rear connecting sleeve 651 by a roller connecting pin 641; a push rod sleeve 67 is also fitted onto the front part of the aforementioned push rod 65, and inside the push rod sleeve 67... A push rod spring 652 is provided, which abuts against the push rod sleeve 67 and the push rod 65. The push rod spring 652 provides continuous preload force to compensate for gear meshing clearance and ensure that the roller 64 always fits tightly against the cam profile, adapting to the motion accuracy requirements under different loads. The aforementioned push rod connecting plate 66 passes through the aforementioned push rod sleeve 67, and the rear end of the push rod connecting plate 66 is fitted into the front part of the aforementioned push rod 65. The aforementioned push rod connecting plate 66 and the push rod 65 are fixedly installed by a fixing bolt. When the aforementioned driven gear 62 rotates with the driving gear 43, it drives the front needle frame forward and backward movement cam 63 to rotate and push the roller 64, thereby driving the push rod 65 to move back and forth. The push rod spring 652 ensures that the roller 64 is always in contact with the front needle frame forward and backward movement cam drive block 631. The aforementioned push rod 65 drives the front needle frame pull rod 61 to move back and forth through the push rod connecting plate 66, ultimately driving the front needle frame 1 to reciprocate back and forth.

[0028] In this embodiment, a front needle frame connecting block 12 is fixedly installed at the lower end of the front surface of the aforementioned front needle frame 1. The front needle frame pull rod 61 of the aforementioned front needle frame front and rear drive unit 6 is connected to the front needle frame connecting block 12 through a front needle frame connecting pin 611, so that the aforementioned front needle frame pull rod 61 can perform reciprocating motion in the front and rear directions.

[0029] Furthermore, the aforementioned needle holder swing unit 5 includes a needle holder swing motor 51, a swing shaft 52, a swing transmission component 53, a front needle holder swing connecting rod 54, and a rear needle holder swing connecting rod 55. The needle holder swing motor 51 is fixedly mounted on the sewing machine frame. One end of the swing shaft 52 is connected to the power output shaft of the needle holder swing motor 51 via a motor connecting sleeve. The swing transmission component 53 is fixedly mounted on the other end of the swing shaft 52, away from the needle holder swing motor 51. One end of the front needle holder swing connecting rod 54 is rotatably engaged with the swing transmission component 53, and the other end of the front needle holder swing connecting rod 54 is rotatably engaged with the front needle holder 1 frame, thereby achieving a rotatable connection between the swing transmission component 53 and the front needle holder 1. One end of the aforementioned rear needle holder swing linkage 55 is connected to the aforementioned swing transmission component 53 via an eccentric pin 551, and the other end of the rear needle holder swing linkage 55 is connected to the bottom of the aforementioned rear needle holder 2 via a connecting pin, thereby realizing the rotational connection between the swing transmission component 53 and the aforementioned rear needle holder 2; the needle holder swing motor 51 drives the swing shaft 52 to rotate, and the swing transmission component 53 rotates with the shaft; the front needle holder swing linkage 54 converts the rotational motion of the swing transmission component 53 into the left and right swing of the front needle holder 1; the aforementioned rear needle holder swing linkage 55 converts the rotational motion of the swing transmission component 53 into the reverse swing of the rear needle holder 2 via the eccentric pin 551, thereby realizing the relative reverse swing of the front needle holder 1 and the rear needle holder 2, that is, when the front needle holder 1 swings to the left, the rear needle holder 2 swings to the right, and vice versa, effectively meeting the requirements of symmetrical stitches in the sewing process.

[0030] Please continue reading Figure 1 and Figure 2 The aforementioned shift control mechanism unit 7 includes a cylinder 71, a cylinder bracket 72, a cylinder top pin 73, and a neutral block 74. The cylinder 71 is fixedly mounted on the sewing machine frame via the cylinder bracket 72. The cylinder top pin 73 is mounted on the telescopic rod of the cylinder 71. The top of the neutral block 74 is fitted together with the cylinder top pin 73, and the bottom of the neutral block 74 is fixedly mounted to the front needle carriage pull rod 61 of the aforementioned front needle carriage front and rear drive unit 6 via fasteners. This allows the aforementioned cylinder 71 to drive the front needle holder lever 61 to perform reciprocating motion in the front and back directions. When the front needle holder 1 needs to enter neutral, the cylinder 71 extension rod extends, pushing the cylinder top pin 73 forward, which in turn moves the neutral top block 74 and the front needle holder lever 61 forward, causing the front needle holder 1 to move forward significantly relative to its initial position. The front needle bar 11 disengages from the needle plate 88 and enters neutral, allowing the rear needle bar 21 to insert the needle at any position in the left, center, or right of the machine head space. After sewing is completed, the cylinder 71 extension rod retracts, and the front needle holder 1 returns to its original position, achieving synchronous sewing with both needle bars.

[0031] In this embodiment, the aforementioned feeding unit 8 includes a feeding motor 81, a feeding crank 82, a rear universal joint connecting rod 83, a front universal joint connecting rod 84, a slide rod 85, a feeding tooth connecting rod 86, a feeding tooth 87, and a needle plate 88. The feeding motor 81 is fixedly mounted on the sewing machine's worktable. The feeding crank 82 is mounted on the power output shaft of the feeding motor 81. The rear end of the rear universal joint connecting rod 83 is fitted together with the feeding crank 82. The front universal joint connecting rod 84 is connected to the front end of the rear universal joint connecting rod 83 via a transmission connection. The front universal joint connecting rod 84 is rotatably connected to the slide rod 85 via a connecting pin. A slide rod connecting plate 851 is also provided on the slide rod 85, through which the slide rod 85 is connected to the feeding tooth connecting rod 86. The feed tooth 87 is fixedly connected at the rear end, and the feed tooth 87 is installed at the front end of the feed tooth connecting rod 86. The needle plate 88 is fixedly installed on the feed tooth 87, and the needle plate 88 is located directly below the front needle bar 11 and the rear needle bar 21. The feed tooth 87 and the needle plate 88 can cooperate with the front needle bar 11 and the rear needle bar 21 to sew patterned stitches. The feed motor 81 drives the feed crank 82 to rotate, and the rotational motion is converted into the reciprocating linear motion of the slide bar 85 through the transmission of the rear universal connecting rod 83 and the front universal connecting rod 84. The slide bar 85 drives the feed tooth connecting rod 86 to move back and forth through the slide bar connecting plate 851, and the feed tooth 87 moves back and forth accordingly, cooperating with the needle plate 88 to complete the feeding of needle and thread materials. The feeding rhythm is synchronized with the needle frame swinging action controlled by the needle frame swinging unit 5 to ensure the accuracy of the stitches.

[0032] Please see Figures 1 to 4The applicant briefly describes the working principle of the technical solution provided by this utility model: When the dual needle holders are working together, the main drive unit 4 starts, the main motor 41 is powered on and runs, driving the main drive shaft 42 to rotate. The drive crank 44 on the main drive shaft 42 drives the rear needle bar connector 212 to move up and down through the drive connecting rod 45. The rear needle bar 21 drives the front needle bar 11 to move up and down synchronously through the needle bar connecting rod 33. The driving gear 43 rotates with the main drive shaft 42 and transmits power to the driven gear 62 of the front needle holder front and rear drive units 6. The driven gear 62 drives the front and rear action cams 63 of the front needle holder to rotate synchronously and push the roller 64 to move, so that the push rod 65 It can move back and forth, ultimately driving the front needle frame 1 to move back and forth via the transmission of the front needle frame lever 61. Simultaneously, the needle frame swing motor 51 starts, driving the swing shaft 52 to rotate, which in turn drives the swing transmission component 53 to rotate. The swing transmission component 53 pushes the front needle frame 1 to swing via the front needle frame swing linkage 54, and simultaneously drives the rear needle frame swing linkage 55 via the eccentric pin 551, causing the rear needle frame 2 to swing in the opposite direction. The two needle frames form a synchronous left-right opposite swing. Finally, the feeding unit 8 operates synchronously, causing the feed teeth 87 to intermittently move on the needle plate 88, coordinating with the needle bar movement to ensure uniform stitches. The feeding motor 81 can also control the front-to-back stitch distance. Please refer to [link to relevant documentation]. Figure 3 At this time, the front needle holder 1, along with the front needle bar 11 inside it, reciprocates around the rear needle holder 2, and the distance between the two needle bars is controlled by the needle holder swing motor 51, which can be adjusted arbitrarily within the machine head space.

[0033] When this technical solution is in the single-needle-frame neutral sewing mode, the shift control unit 7 operates, the cylinder 71 is energized and started, the cylinder extension rod pushes the cylinder top pin 73, causing the neutral top block 74 and the front needle frame pull rod 61 to move forward, so that the front needle frame 1 moves forward significantly relative to its initial position, the front needle rod 11 disengages from the needle plate 88 and enters the neutral state. Please refer to [link / reference]. Figure 4 Since the front needle holder 1 is in neutral and runs freely to the left and right, the rear needle bar 21 can swing freely to any position on the left, center, or right to achieve "I" shaped or irregular stitch sewing. The spacing of each needle point is electrically controlled and can be adjusted arbitrarily within the machine head space to achieve a variety of patterned stitch sewing.

[0034] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

[0035] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the utility model task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. An electrically controlled needle holder oscillation transmission device for a double-needle sewing machine, characterized in that... The device includes: a front needle holder (1) and a rear needle holder (2), wherein a front needle bar (11) is installed inside the front needle holder (1), and a rear needle bar (21) is installed inside the rear needle holder (2), and the front needle holder (1) and the rear needle holder (2) are connected by a needle holder connecting rod assembly (3); a main drive unit (4), which drives the front needle holder (1) and the rear needle holder (2) to perform reciprocating motion in the up and down direction and drives the front needle bar (11) and the rear needle bar (21) to perform reciprocating motion in the up and down direction simultaneously; and a needle holder swing unit (5), which drives the front needle holder (1) and the rear needle holder (2) to perform swing motion in opposite directions to the left and right. The front needle holder front and rear drive unit (6) is connected to the main drive unit (4) by power coupling, and the front needle holder front and rear drive unit (6) is connected to the front needle holder (1) by transmission through the front needle holder pull rod (61) to drive the front needle holder (1) to perform reciprocating motion in the front and rear directions; the shift control mechanism unit (7) can drive the front needle holder pull rod (61) to make the front needle holder (1) move forward significantly relative to the initial position so that the front needle bar (11) enters the neutral state; the feeding unit (8) is used to feed the needle thread material and keep it synchronized with the swinging motion of the front needle holder (1) and the rear needle holder (2).

2. The electrically controlled needle holder swing transmission device for a double-needle sewing machine according to claim 1, characterized in that: The needle holder connecting rod assembly (3) includes a needle holder connecting pin (31), a needle holder support (32), and a needle rod connecting rod (33); wherein, the needle holder support (32) is located at the front end of the front needle holder (1), and one end of the needle holder connecting pin (31) is fitted at the top of the rear needle holder (2), and the other end of the needle holder connecting pin (31) passes through the top of the front needle holder (1) and is fitted on the needle holder support (32). The needle holder connecting pin (31) is connected to the front needle holder (2) by a needle holder connecting pin universal bearing (311). Rotational engagement of the needle holder (1): A front needle bar clamp (111) is installed at a position slightly below the middle of the height of the front needle bar (11), and a rear needle bar clamp (211) is installed at the top end of the rear needle bar (21). The top end of the needle bar connecting rod (33) is fitted onto the rear needle bar clamp (211) and rotates with it, while the bottom end of the needle bar connecting rod (33) is fitted onto the front needle bar clamp (111) and rotates with it, thereby realizing the rotational connection between the front needle bar (11) and the rear needle bar (21).

3. The electrically controlled needle holder swing transmission device for a double-needle sewing machine according to claim 1, characterized in that: The main drive unit (4) includes a main motor (41), a main drive shaft (42), a drive gear (43), a drive crank (44), and a drive connecting rod (45); wherein, one end of the main drive shaft (42) in the length direction is connected to the output power shaft of the main motor (41) through a connecting sleeve (421), the drive gear (43) is mounted on the shaft of the main drive shaft (42) and is connected to the front needle holder front and rear drive units (6) through power coupling, and the drive crank (44) is fixedly mounted on the main drive unit (41). The main drive shaft (42) is located at the other end of the main motor (41), and one end of the drive connecting rod (45) is fitted with the drive crank (44) through a connecting pin. A rear needle rod connector (212) is installed at a position slightly below the middle of the height of the rear needle rod (21). The other end of the drive connecting rod (45) away from the drive crank (44) is fitted with the rear needle rod connector (212), thereby realizing the transmission connection between the drive crank (44) and the rear needle rod (21).

4. The electrically controlled needle holder swing transmission device for a double-needle sewing machine according to claim 3, characterized in that: The front needle holder front and rear drive unit (6) further includes a passive gear (62), a front needle holder front and rear movement cam (63), a roller (64), a push rod (65), and a push rod connecting plate (66); wherein, the passive gear (62) is connected to the driving gear (43) of the main drive unit (4) through gear meshing transmission; the front needle holder front and rear movement cam (63) is disposed on one side of the driving gear (62) and can rotate under the drive of the passive gear (62); the front needle holder front and rear movement cam (63) can drive the roller (64) to move; the rear part of the push rod (65) is fixedly connected to the roller (64), and the roller (64) can drive the push rod (65) to move back and forth; the push rod connecting plate (66) is fixedly connected to the front end of the push rod (65); the push rod connecting plate (66) is also fixedly connected to the rear end of the front needle holder pull rod (61) by fasteners.

5. The electrically controlled needle holder swing transmission device for a double-needle sewing machine according to claim 4, characterized in that: A driven gear pivot pin (621) is inserted at the center of the driven gear (62), and the front needle holder front and rear movement cam (63) is fitted on the driven gear pivot pin (621) to achieve its radial positioning; a pair of front needle holder front and rear movement cam drive blocks (631) are also formed on the side surface of the front needle holder front and rear movement cam (63) facing the driven gear (62), and the front needle holder front and rear movement cam drive blocks (631) pass forward through the driven gear (62) and can contact the roller (64) to drive the roller (64) to move; a push rod rear connecting sleeve (651) is also formed at the rear end of the push rod (65), and the roller (64) is fitted on the push rod rear connecting sleeve. The sleeve (651) is fixedly connected to the rear connecting sleeve (651) of the push rod through a roller connecting pin (641); a push rod sleeve (67) is also fitted in front of the push rod (65), and a push rod spring (652) is provided in the push rod sleeve (67) to abut against the push rod sleeve (67) and the push rod (65); the push rod spring (652) enables the roller (64) to always abut against the front needle holder front and rear movement cam drive block (631); the push rod connecting plate (66) passes through the push rod sleeve (67) and the rear end of the push rod connecting plate (66) is fitted into the front part of the push rod (65); the push rod connecting plate (66) and the push rod (65) are fixedly installed by a fixing bolt.

6. The electrically controlled needle holder swing transmission device for a double-needle sewing machine according to claim 1, characterized in that: A front needle frame connecting block (12) is fixedly installed at the lower end of the front surface of the front needle frame (1). The front needle frame pull rod (61) of the front needle frame front and rear drive unit (6) is connected to the front needle frame connecting block (12) through a front needle frame connecting pin (611), so that the front needle frame pull rod (61) can perform reciprocating motion in the front and rear directions.

7. The electrically controlled needle holder swing transmission device for a double-needle sewing machine according to claim 1, characterized in that: The needle holder swing unit (5) includes a needle holder swing motor (51), a swing shaft (52), a swing transmission component (53), a front needle holder swing link (54), and a rear needle holder swing link (55); wherein, the needle holder swing motor (51) is fixedly mounted on the frame of the sewing machine, one end of the swing shaft (52) along its length is connected to the power output shaft of the needle holder swing motor (51) through a motor connecting sleeve, and the swing transmission component (53) is fixedly mounted on the other end of the swing shaft (52) along its length away from the needle holder swing motor (51), and the front needle holder swing link (54) One end of the swing transmission member (53) is rotated with the swing transmission member (53), and the other end of the swing link (54) of the front needle frame is rotated with the frame of the front needle frame (1), thereby realizing the rotational connection between the swing transmission member (53) and the front needle frame (1). One end of the swing link (55) of the rear needle frame is connected to the swing transmission member (53) through an eccentric pin (551), and the other end of the swing link (55) of the rear needle frame is connected to the bottom of the rear needle frame (2) through a connecting pin, thereby realizing the rotational connection between the swing transmission member (53) and the rear needle frame (2).

8. The electrically controlled needle holder swing transmission device for a double-needle sewing machine according to claim 1, characterized in that: The shift control mechanism unit (7) includes a cylinder (71), a cylinder bracket (72), a cylinder top pin (73), and a neutral block (74). The cylinder (71) is fixedly mounted on the frame of the sewing machine through the cylinder bracket (72). The cylinder top pin (73) is mounted on the telescopic rod of the cylinder (71). The top part of the neutral block (74) is fitted together with the cylinder top pin (73). The bottom part of the neutral block (74) is fixedly mounted together with the front needle frame pull rod (61) of the front needle frame drive unit (6) through fasteners, so that the cylinder (71) can drive the front needle frame pull rod (61) to perform reciprocating motion in the front and back directions.

9. The electrically controlled needle holder swing transmission device for a double-needle sewing machine according to claim 1, characterized in that: The feeding unit (8) includes a feeding motor (81), a feeding crank (82), a rear universal joint connecting rod (83), a front universal joint connecting rod (84), a slide rod (85), a feeding tooth connecting rod (86), a feeding tooth (87), and a needle plate (88); wherein, the feeding motor (81) is fixedly mounted on the sewing machine's worktable, the feeding crank (82) is mounted on the power output shaft of the feeding motor (81), the rear end of the rear universal joint connecting rod (83) is fitted together with the feeding crank (82), and the front universal joint connecting rod (84) is connected to the front end of the rear universal joint connecting rod (83) for transmission; the front universal joint connecting rod (84) is connected to the front end of the rear universal joint connecting rod (83) for transmission. A connecting pin is used to achieve a rotatable connection with the slide rod (85). A slide rod connecting plate (851) is also provided on the slide rod (85). The slide rod (85) is fixedly connected to the rear end of the feed dog connecting rod (86) through the slide rod connecting plate (851). The feed dog (87) is installed at the front end of the feed dog connecting rod (86). The needle plate (88) is fixedly installed on the feed dog (87). The needle plate (88) is located directly below the front needle bar (11) and the rear needle bar (21). The feed dog (87) and the needle plate (88) can cooperate with the front needle bar (11) and the rear needle bar (21) to perform pattern stitch sewing.

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