Bidirectionally-driven multi-head towel embroidery machine

Abstract

The invention relates to a bidirectionally-driven multi-head towel embroidery machine, which comprises more than two towel thread clamping devices and more than two needle ring shuttle frames, and the more than two towel thread clamping devices are jointly connected with two first driving devices through a first pull rod; the two first driving devices jointly drive the two or more towel thread clamping devices to move in the axial direction of the first pull rod, the two or more towel thread clamping devices are located at the two ends of the moving direction of the towel thread clamping devices respectively, and the two or more needle ring shuttle frames are jointly connected with two second driving devices through second pull rods. The two second driving devices jointly drive the more than two needle ring shuttle frames to move in the axial direction of the second pull rod and are located at the two ends of the moving direction of the needle ring shuttle frames respectively. According to the multi-head towel embroidery machine, the two first driving devices jointly drive the more than two towel thread clamping devices, and the two second driving devices jointly drive the more than two needle ring shuttle frames, so that the running stability of the multi-head towel embroidery machine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of multi-head towel embroidery machines, in particular to a bidirectionally driven multi-head towel embroidery machine and a thread trimming method. Background Art

[0002] The multi-head towel embroidery machine adopts a multi-head design: usually equipped with 4-16 heads, it can embroider different patterns synchronously. It is a special embroidery equipment that forms a three-dimensional ring coil (similar to the texture on the surface of the towel) on the fabric surface through special hooks and wires. It is often used to make embroidery patterns with 3D effects. The main technical parameters of this embroidery machine involve color change speed (high-quality models <0.5 seconds) and XY axis guide rail accuracy (error should be ≤0.01mm). As the multi-head towel embroidery machine adopts a multi-head design, the increase in the number of heads has led to a decrease in the color change speed and XY axis guide rail accuracy to varying degrees. How to improve the color change speed and XY axis guide rail accuracy of the multi-head towel embroidery machine is the object of research for technicians in this field. Summary of the invention

[0003] The present invention provides a bidirectionally driven multi-head towel embroidery machine, which realizes bidirectional drive by arranging radial driving devices at both ends of the running directions of two key components, a towel thread clamp and a needle loop shuttle frame, which are involved in the color change and guide rail accuracy of the embroidery machine, to solve the technical problem of decreased color change speed and guide rail accuracy caused by an increase in the number of machine heads.

[0004] The present application provides a bidirectionally driven multi-head towel embroidery machine, and the technical solution is as follows: it includes more than two towel thread clamps and more than two needle loop shuttle racks, the more than two towel thread clamps are connected to two first driving devices through a first pull rod, the two first driving devices jointly drive the more than two towel thread clamps to move axially along the first pull rod, and are respectively located at the two ends of the moving direction of the towel thread clamps, the more than two needle loop shuttle racks are connected to two second driving devices through a second pull rod, the two second driving devices jointly drive the more than two needle loop shuttle racks to move axially along the second pull rod, and are respectively located at the two ends of the moving direction of the needle loop shuttle racks.

[0005] The first driving device and the second driving device are connected to each other through a mounting frame to form an integrated driving module, and the driving module is connected to the refrigeration module through a cooling pipe.

[0006] The first driving device includes a first motor, which drives the first color-changing camshaft to rotate through a first gear set. A spiral first track is provided on the outer periphery of the first color-changing camshaft. A first roller running along the first track is embedded in the first track. The first roller is connected to the first mounting hole of the first moving block, and the second mounting hole of the first moving block is connected to the first pull rod.

[0007] The first gear set includes a first gear connected to the first motor and a second gear connected to the first color-changing camshaft, the first gear is meshedly connected to the second gear, and the diameter of the first gear is smaller than that of the second gear.

[0008] The first moving block is connected to the first guide shaft at the upper and lower sides of the first mounting hole respectively.

[0009] The second driving device includes a second motor, which drives the second color-changing camshaft to rotate through a second gear set. A spiral second track is provided on the outer periphery of the second color-changing camshaft. A second roller running along the second track is embedded in the second track. The second roller is connected to the third mounting hole of the second moving block. The fourth mounting hole of the second moving block is connected to the second pull rod.

[0010] The second gear set includes a third gear connected to the second motor and a fourth gear connected to the second color-changing camshaft, the third gear is meshed and connected to the fourth gear, and the diameter of the third gear is smaller than that of the fourth gear.

[0011] The second moving block is connected to the second guide shaft at the upper and lower sides of the fourth mounting hole respectively.

[0012] One end of the second color-changing camshaft is connected to the fourth gear, and the other end is connected to the fifth gear. The fifth gear is meshed and connected to the sixth gear. The sixth gear is connected to the position sensor of the second color-changing camshaft through a connecting shaft.

[0013] The present invention improves the running stability of a multi-head towel embroidery machine by jointly driving two or more towel thread clamps and two second drive devices jointly driving two or more needle loop shuttle frames, has the advantages of improving the color changing speed and guide rail accuracy, realizing synchronous driving of multiple towel thread clamps and needle loop shuttle frames, and improving the stability and efficiency of the drive device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a three-dimensional structural schematic diagram of a bidirectionally driven multi-head towel embroidery machine of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of another angle of a bidirectionally driven multi-head towel embroidery machine of the present invention; Figure 3 This is a schematic diagram of the three-dimensional installation structure of the driving module in the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the second driving device in the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the first driving device in the present invention. DETAILED DESCRIPTION

[0015] The following is combined with Figure 1-5 The specific implementation method further explains the technical solution of this patent in detail.

[0016] The following will be combined with the drawings in the present application to clearly and completely describe the technical solutions in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The components of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed for protection, but only represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0017] In the prior art, after the multi-head towel embroidery machine adopts a multi-head design, as the number of heads increases, the color changing speed and guide rail accuracy gradually decrease. Traditional equipment adopts a single-side drive structure. When multiple towel thread clamps or needle loop shuttle frames move synchronously, the driving force transmission distance increases, resulting in asynchronous movement. Position deviation is easy to occur during the color change process, especially when changing colors at high speeds. The error accumulation is more obvious. For example, when a certain model of equipment is configured with 16 heads, the color changing speed drops to more than 8 seconds, and the cumulative error of the XY axis guide rail exceeds 3 mm, affecting the forming quality of the three-dimensional coil.

[0018] In order to solve the above problems, designers found that the synchronization of moving parts directly affects the color-changing efficiency and positioning accuracy. By analyzing the drive structure, it was found that the single-sided drive has terminal hysteresis in long-stroke movement, resulting in inconsistent motion trajectories of multiple actuators. After repeated verification, the use of bidirectional collaborative drive can effectively balance the distribution of driving force and eliminate terminal hysteresis. In specific implementation, drive devices are set at both ends of the moving direction so that the actuators can obtain symmetrical driving force, and the rigid connection is optimized to improve dynamic response.

[0019] Therefore, the present application proposes a bidirectionally driven multi-head towel embroidery machine, comprising two or more sets of towel thread clamps 7 and needle loop shuttle frames 4. The two or more sets of towel thread clamps are commonly connected to the first pull rod 2, and the first driving devices are configured at both ends to cooperate in driving the axial movement; the two or more sets of needle loop shuttle frames 4 are commonly connected to the second pull rod 5, and the second driving devices are configured at both ends to cooperate in driving the axial movement.

[0020] Among them, the first pull rod 2 refers to a rigid transmission rod that runs through all towel clamps. Specifically, it can be implemented by an alloy steel bar with a diameter of 8-22 mm. Its function is to evenly transmit the driving force at both ends to each towel clamp to avoid deformation errors caused by excessively long transmission chains. The first drive device refers to a power component symmetrically arranged at both ends of the pull rod. Specifically, it can be implemented by a servo motor in conjunction with a reduction gear set. The motors at both ends achieve torque balance through a synchronous controller, thereby eliminating inertial deviations during movement. The second pull rod refers to a positioning guide rod connecting all needle loop shuttle racks. Its function is to maintain the linear motion trajectory of the needle loop shuttle rack during bidirectional drive to prevent lateral deviation. The second drive device refers to a power mechanism arranged at both ends of the moving direction of the needle loop shuttle rack. Specifically, it can be implemented by a servo motor in conjunction with a reduction gear set. The motors at both ends achieve torque balance through a synchronous controller, thereby eliminating inertial deviations during movement.

[0021] Specifically, when a color-changing action is required, the first drive devices at both ends synchronously output driving force, and drive all towel clamps to move axially through the first pull rod. Since the power is applied symmetrically at both ends, each towel clamp is evenly stressed, and the consistency of movement speed is guaranteed. At the same time, the second drive device synchronously drives the second pull rod, so that all needle loop shuttle frames maintain synchronous positioning during axial movement. This structure converts the bidirectional driving force into overall movement through a rigidly connected pull rod, avoiding the end lag problem of traditional unilateral drive. During high-speed color changing, the drive devices at both ends can adjust the output torque in real time according to the feedback from the position sensor, and dynamically compensate for the inertia difference of the moving parts.

[0022] Compared with the existing technology, when the traditional equipment adopts single-sided drive, there is a speed difference between the actuator close to the drive end and the end component, resulting in extra time for position calibration after the color change action is completed. This solution uses synchronous drive at both ends to keep the speed of each actuator synchronized throughout the movement, and the target position is reached when the color change action is completed, without the need for secondary calibration. In addition, the bidirectional drive structure effectively reduces the load of a single drive device, avoids wear of transmission components caused by overload, and extends the service life of the equipment.

[0023] Through the above technical solution, the present application enables the multi-head embroidery machine to maintain a stable color-changing speed when the number of heads is increased, and the consistency of the motion trajectory of each head is significantly improved, effectively reducing the forming error of the circular coil during the embroidery process. This structure is particularly suitable for high-density configuration scenarios with more than 16 heads. It can maintain the positioning accuracy of the XY axis guide rails in a continuous working state to ensure the edge clarity of the three-dimensional embroidery pattern.

[0024] The present application further proposes that the first driving device and the second driving device are connected to each other through the mounting frame 1 to form an integral driving module 6 , and the driving module is connected to the refrigeration module 9 through a cooling pipe 8 .

[0025] The installation frame 1 refers to a rigid support structure that supports the driving device, which can be realized by splicing a frame made of aluminum alloy profiles. The two driving devices are connected by the frame to form a rigid integral structure, which can simultaneously absorb the vibration energy during the operation of the equipment. The cooling pipe refers to a pipeline for conveying cooling medium, which can be specifically made of a copper serpentine coil wrapped around the surface of the driving module, and the heat generated by the operation of the driving device is transferred to the outside through the circulating cooling medium. The refrigeration module refers to a temperature control unit, which can be specifically composed of a semiconductor refrigeration sheet and a heat dissipation fin, and the driving device is maintained in a stable operating temperature range by actively adjusting the temperature of the cooling medium.

[0026] Specifically, the mounting frame integrates two independently driven devices into a single module, and its rigid connection structure can suppress the resonance effect generated during bidirectional driving. The cooling pipe is arranged along the surface of the driving module to form a heat exchange interface, and the refrigeration module controls the coolant temperature within a predetermined range through the compressor refrigeration principle. When the bidirectional drive device works synchronously, the integrated structure of the frame can reduce the relative displacement error of the components, and the cooling system continuously removes the heat from the motor and transmission mechanism to avoid mechanical deformation caused by temperature changes.

[0027] Compared with the existing technology, the traditional multi-head embroidery machine adopts a split drive structure and lacks active cooling measures, which leads to a decrease in the heat dissipation efficiency of the drive system when the number of heads increases, and the guide rail expands due to heat, causing positioning deviation. This solution uses an integrated drive module with an active cooling unit to build a constant temperature controlled bidirectional drive system, overcoming the impact of temperature fluctuations on motion accuracy.

[0028] Through the above technical solution, the application effectively suppresses the heat accumulation generated by the long-term operation of the multi-head drive system, and solves the technical defect of deformation of the XY axis guide rail caused by temperature changes. The constant temperature drive operation mode controls the displacement error when the multi-head synchronous color change is performed, ensuring the embroidery accuracy and stability of the multi-head towel embroidery machine under the high-density head configuration.

[0029] The present application further proposes a bidirectionally driven multi-head towel embroidery machine, wherein the first driving device includes a first motor 16, the first motor 16 drives the first color-changing cam shaft 10 to rotate through a first gear set, the first color-changing cam shaft 10 is provided with a spiral first track 26 on the outer periphery, the first track 26 is embedded with a first roller 25 running along the first track 26, the first roller 25 is connected to the first mounting hole 18 of the first moving block 24, and the second mounting hole 11 of the first moving block 24 is connected to the first pull rod 2.

[0030] Among them, the first gear set refers to a transmission mechanism that transmits the power of the first motor to the first color-changing camshaft, which can be specifically realized by a combination of mutually meshing gears, and the rotational motion of the motor output shaft is converted into the rotational motion of the camshaft through gear meshing. The first color-changing camshaft refers to a rotating shaft with a spiral track on the surface, and the spiral track on its periphery can convert the rotational motion into linear motion through rollers. The first roller refers to a cylindrical rolling component embedded in the spiral track, which can be made of bearing steel to achieve low-friction rolling, and converts the rotation of the camshaft into the linear displacement of the moving block by moving along the track. The first moving block refers to a rigid component connecting the roller and the pull rod, and its first mounting hole is used to fix the roller, and the second mounting hole is used to connect the pull rod. The linear motion of the roller is transmitted to the pull rod through the moving block.

[0031] Specifically, the first motor drives the first color-changing camshaft to rotate through the first gear set. The spiral track rotates with the camshaft to push the first roller embedded in the track to move axially. The roller drives the first moving block to produce a linear displacement at the position of the first mounting hole, and then drives the first pull rod to move axially through the second mounting hole. This movement process converts the rotational power into a linear driving force, so that multiple towel clamps move synchronously under the linkage of the pull rod. The rolling contact of the roller in the spiral track reduces the sliding friction, and the cooperation between the moving block and the guide shaft further constrains the movement direction, thereby ensuring the transmission accuracy of the linear driving force.

[0032] Compared with the existing technology, the traditional multi-head embroidery machine drive device mostly uses a single-side motor with a linear guide to achieve unidirectional drive, which is prone to color change speed reduction and position deviation due to transmission gap or guide deformation. This solution eliminates the transmission lag problem of unilateral drive through a bidirectional drive structure combined with the rolling transmission of the camshaft and the roller. At the same time, the continuous rotation of the spiral track can achieve a smoother linear displacement output.

[0033] Through the above technical solution, the present application realizes the precise transmission and bidirectional synchronous control of the driving force of the towel clamp, and solves the problem of the color change speed decrease and the insufficient guide rail accuracy caused by the increase in the number of heads of the multi-head embroidery machine. The rolling contact between the roller and the spiral track reduces the movement resistance and improves the driving efficiency; the cooperation between the moving block and the guide shaft effectively suppresses the deviation during the movement and ensures the linearity of the axial movement of the pull rod.

[0034] The present application further proposes that the first gear set includes a first gear 17 connected to the first motor 16 and a second gear 22 connected to the first color-changing camshaft 10 , the first gear 17 is meshedly connected to the second gear 22 , and the diameter of the first gear 17 is smaller than that of the second gear 22 .

[0035] The first gear refers to a transmission component directly connected to the motor output shaft, and can be rigidly connected to the motor shaft through a keyway structure to achieve power transmission. The second gear refers to a driven gear coaxially assembled with the color-changing camshaft. The design of the first gear having a smaller diameter than the second gear can form a reduction transmission ratio, for example, the transmission ratio range is set to 1:2 to 1:10, so that the high speed output of the motor is converted into a low speed and high torque output of the color-changing camshaft.

[0036] Specifically, when the first motor is started, its output shaft drives the first gear to rotate, and drives the second gear to rotate in the opposite direction at a lower speed through the meshing action of the tooth surface. Since the second gear is fixedly connected to the first color-changing camshaft, the reduction transmission allows the rotation speed of the camshaft to be accurately controlled, for example, reducing the 3000rpm speed input by the motor to a range of 1000-1500rpm. The reduced-speed camshaft drives the spiral first track to adapt to the speed required for the color-changing action, so that the first roller embedded in the track can move smoothly, and then drives the first pull rod to perform axial displacement through the first moving block, and finally realizes the synchronous color-changing operation of multiple towel clamps.

[0037] Compared with the existing technology, the driving gear set of the traditional multi-head embroidery machine usually adopts equal diameter gears or a single driving source, which easily causes the color-changing camshaft speed to be too high, resulting in the deviation of the roller motion trajectory, and there is a problem of insufficient torque when multiple heads are synchronized. This solution uses a gear set design with a specific transmission ratio to reduce the inertial impact of the moving parts while maintaining the power transmission efficiency, so that the color-changing camshaft speed and the roller moving speed form the best matching relationship, thereby reducing the accumulation of motion errors when multiple heads work together.

[0038] Through the above technical solution, the present application can effectively reduce the rotational inertia of the color-changing camshaft, and enhance the load capacity of the drive system on the multi-towel clamp through the deceleration and torque-increasing effect, so that multiple heads can maintain the consistency of motion trajectory during high-speed color change. The component force generated by the meshing transmission of the gear set is limited to the axial direction, avoiding the radial vibration problem existing in traditional belt transmission, thereby improving the color-changing positioning accuracy and the stability of the mechanism operation.

[0039] The present application further proposes a bidirectionally driven multi-head towel embroidery machine, in which the first moving block 24 is connected to the first guide shaft 23 at the upper and lower sides of the first mounting hole 18 respectively.

[0040] The first guide shaft 23 refers to a rigid guide component arranged along the axial direction, which can be implemented by an alloy steel shaft with hard chrome plated surface, and forms a sliding fit with the mounting hole of the moving block to constrain the moving direction. This structure limits the deflection of the moving block by the guide shaft arranged symmetrically at two points, ensuring that the moving block only translates along the axial direction of the pull rod during the driving process of the color-changing camshaft.

[0041] Specifically, when the first color-changing camshaft rotates, the first roller moves along the spiral track to generate an axial thrust. At this time, the first guide shaft symmetrically arranged up and down cooperates with the first mounting hole to form a double constraint, so that the first moving block still maintains a linear motion trajectory when it is subjected to the radial component force transmitted by the color-changing camshaft. This dual guide shaft structure offsets the lateral torque generated by the rotation of the color-changing camshaft, avoiding the movement block from swinging or getting stuck during high-speed color changing.

[0042] Compared with the existing technology, the color-changing mechanism of traditional embroidery machines usually adopts a single-sided guide rod or slide rail structure. When the number of machine heads increases, the movement trajectory of the moving block will be offset due to insufficient guide support. However, this solution forms a double-point support through the guide shafts symmetrically distributed up and down, which significantly improves the linearity of the moving block under the same load conditions.

[0043] Through the above technical solution, the present application effectively suppresses the radial vibration of the moving block during the color changing process of a multi-head embroidery machine, so that multiple towel thread clamps maintain movement consistency during synchronous color changing, thereby maintaining the positioning accuracy of the XY-axis guide rail when the number of machine heads increases.

[0044] The present application further proposes that the second driving device includes a second motor 15, which drives the second color-changing cam shaft 36 to rotate through a second gear set. The second color-changing cam shaft 36 is provided with a spiral second track 31 on the outer periphery, and the second track 31 is embedded with a second roller 35 running along the second track 31. The second roller 35 is connected to the third mounting hole 14 of the second moving block 13, and the fourth mounting hole 12 of the second moving block 13 is connected to the second pull rod 5.

[0045] Among them, the second driving device refers to a power component that controls the axial movement of the needle ring shuttle frame, which can be specifically realized by a combination of a servo motor and a gear transmission mechanism, and is used to accurately control the motion trajectory. The second color-changing camshaft refers to a rotating shaft with a spiral groove, which can be specifically formed by alloy steel material, by converting rotational motion into linear displacement. The spiral second track refers to a continuous groove structure surrounding the outer wall of the second color-changing camshaft, which can be specifically cut and formed by a CNC machine tool, and is used to guide the movement path of the roller. The second roller refers to a cylindrical rolling body embedded in the track, which can be specifically made of hardened steel material to reduce friction resistance. The third mounting hole refers to a circular through hole set on the moving block, which can specifically be fixed to the second roller by an interference fit method for transmitting power. The fourth mounting hole 12 refers to a connecting structure set on the other side of the moving block and is hinged to the second pull rod 5, and is used to drive the needle ring shuttle frame.

[0046] Specifically, the torque output by the second motor is transmitted to the second color-changing camshaft through the second gear set, causing it to rotate. When the spiral second track rotates synchronously with the second color-changing camshaft, the second roller embedded in the track is forced to displace axially. The displacement is transmitted to the second moving block through the third mounting hole, thereby driving the second pull rod rigidly connected to the fourth mounting hole to reciprocate. Since the lead angle of the spiral track is constant, the movement of the second roller is linearly related to the rotation angle of the camshaft, thereby achieving precise control of the movement of the needle ring shuttle frame. At the same time, the rolling friction characteristics between the roller and the track can effectively reduce power loss and extend the service life of mechanical components.

[0047] Compared with the existing technology, traditional multi-head embroidery machines mostly use single-side drive or belt drive, which has the problems of color change response delay and asynchronous movement. However, this solution can eliminate the positioning error caused by transmission gap by combining the rigid transmission structure of spiral camshaft and roller through the second drive device arranged symmetrically on both sides. The application of gear group reduction mechanism makes the motor speed and moving speed match more reasonably, avoiding vibration interference caused by high-speed movement.

[0048] Through the above technical solution, the present application effectively improves the synchronization accuracy of the axial movement of the needle ring shuttle frame, so that multiple heads maintain position consistency during high-speed color change. The matching structure of the spiral track and the roller enhances the rigidity of the transmission system and prevents the movement misalignment caused by load changes during multi-head operation. The torque amplification effect of the gear transmission enables a small power motor to drive multiple sets of needle ring shuttle frames, reducing energy consumption while improving the system response speed.

[0049] The present application further proposes that the second gear set includes a third gear 28 connected to the second motor 15 and a fourth gear 29 connected to the second color-changing camshaft 36 , the third gear 28 is meshedly connected to the fourth gear 29 , and the diameter of the third gear 28 is smaller than that of the fourth gear 29 .

[0050] The third gear refers to a transmission component connected to the output shaft of the second motor. The fourth gear refers to a driven component coaxially fixed to the second color-changing camshaft, and has a larger number of teeth than the third gear. Specifically, a split hub structure can be used to achieve assembly with the camshaft. The diameter difference between the third gear and the fourth gear constitutes a reduction ratio, which increases the output torque by reducing the speed, thereby adapting to the driving force requirements of the color-changing camshaft.

[0051] Specifically, the power of the second motor is transmitted to the fourth gear through the third gear. Since the diameter of the third gear is smaller than that of the fourth gear, a reduction transmission ratio is formed. For example, when the number of teeth of the third gear is 15 and the fourth gear is 45, the transmission ratio is 1:3, which reduces the speed of the fourth gear to one-third of the motor speed, while the output torque is increased to three times. The decelerated movement directly drives the second color-changing camshaft to rotate through the fourth gear, and the synchronization of the unfolding speed of its spiral track and the movement of the roller is enhanced. In this process, the gear meshing clearance can be compensated by adjusting the installation spacing of the gear pair to avoid the angle offset of the color-changing camshaft due to transmission error.

[0052] Compared with the existing technology, the traditional single-motor direct-drive color-changing camshaft solution relies on a high-power motor to directly overcome the camshaft load, which easily leads to motor overload and positioning deviation. By introducing a gear set with a reduction ratio, the power demand for the motor is reduced while maintaining the same color-changing speed, and the smoothness of the color-changing camshaft movement is improved by increasing the output torque. In addition, the gear meshing transmission has higher positioning repeatability than the belt or chain transmission, which can reduce the accumulated position error during the movement.

[0053] Through the above technical solution, the present application realizes the optimized distribution of the driving force of the color-changing camshaft, reduces the motor load and ensures the precise displacement of the roller in the spiral track. The application of the reduction gear set enables the second color-changing camshaft to run at a more stable speed, avoiding the problem of needle ring shuttle frame shaking caused by sudden speed changes, thereby improving the position consistency when multiple heads change colors synchronously. The rigid transmission characteristics of the gear pair further reduce the influence of the deformation of the transmission components on the accuracy of the XY axis guide rails.

[0054] The present application further proposes that the second moving block 13 is connected to the second guide shaft 30 at the upper and lower sides of the fourth mounting hole 12. One end of the second color-changing cam shaft 36 is connected to the fourth gear 29, and the other end is connected to the fifth gear 34. The fifth gear 34 is meshed and connected to the sixth gear 32. The sixth gear 32 is connected to the position sensor 20 of the second color-changing cam shaft through the connecting shaft 33.

[0055] Wherein, the fifth gear 34 refers to a transmission component arranged at the end of the second color-changing camshaft, and is used to transmit the rotational motion of the second color-changing camshaft to the sixth gear. Wherein, the sixth gear refers to a driven component meshing with the fifth gear. Wherein, the connecting shaft 33 refers to a rigid transmission rod connecting the sixth gear and the position sensor, and is used to convert the gear rotation angle into an electrical signal. Wherein, the position sensor 20 refers to a detection device for monitoring the rotation angle of the second color-changing camshaft, and specifically, a photoelectric encoder with a resolution of 0.1 degrees can be used to feed back the position data of the second color-changing camshaft to the control system in real time. The position sensor collects data in real time and feeds it back to the controller to form a closed-loop control circuit to ensure that the axial movement position of the needle ring shuttle frame is consistent with the preset trajectory.

[0056] Compared with the existing technology, the traditional multi-head embroidery machine uses an independent encoder to directly detect the position of the motor output shaft, which has the problem of transmission chain error accumulation. This solution directly detects the actual rotation angle of the camshaft by adding a gear transmission chain and a position sensor at the end of the color-changing camshaft, eliminating the error interference of the intermediate transmission link.

[0057] Through the above technical solution, the present application realizes direct high-precision detection of the rotation angle of the second color-changing cam shaft, and solves the problem of decreased position synchronization caused by the increase in the number of heads of multi-head embroidery machines. The closed-loop control mechanism effectively compensates for the gap error of the transmission system, ensures the synchronous movement accuracy of multiple needle loop shuttle frames, and avoids the misalignment defects of embroidery stitches caused by position deviation.

[0058] Through the above technical solution, the present application effectively solves the problem of decreased color changing positioning accuracy caused by the increase in the number of machine heads in multi-head embroidery machines. Through the coordinated work of the terminal transmission gear set and the position sensor, real-time calibration of the rotation angle of the color changing camshaft is achieved while ensuring the color changing speed, significantly improving the position consistency during synchronous color changing of multiple machine heads.

[0059] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A two-way driven multi-head towel embroidery machine, comprising more than two towel thread clamps (7) and more than two needle loop shuttle racks (4), characterized in that: The two or more towel thread clamps (7) are connected to two first drive devices via a first pull rod (2), and the two first drive devices jointly drive the two or more towel thread clamps (7) to move axially along the first pull rod (2), and are respectively located at the two ends of the moving direction of the towel thread clamps; the two or more needle loop shuttle frames (4) are connected to two second drive devices via a second pull rod (5), and the two second drive devices jointly drive the two or more needle loop shuttle frames (4) to move axially along the second pull rod (5), and are respectively located at the two ends of the moving direction of the needle loop shuttle frames (4).

2. The bidirectionally driven multi-head towel embroidery machine according to claim 1, characterized in that: The first drive device and the second drive device are connected to each other via a mounting frame (1) to form an integrated drive module (6); the drive module (6) is connected to a refrigeration module (9) via a cooling pipe (8).

3. The bidirectionally driven multi-head towel embroidery machine according to claim 1, characterized in that: The first driving device comprises a first motor (16), the first motor (16) drives the first color-changing cam shaft (10) to rotate via a first gear set, a spiral first track (26) is provided on the outer periphery of the first color-changing cam shaft (10), a first roller (25) is embedded in the first track (26) and runs along the first track (26), the first roller (25) is connected to a first mounting hole (18) of a first moving block (24), and a second mounting hole (11) of the first moving block (24) is connected to a first pull rod (2).

4. The bidirectionally driven multi-head towel embroidery machine according to claim 3, characterized in that: The first gear set comprises a first gear (17) connected to the first motor (16) and a second gear (22) connected to the first color-changing camshaft (10); the first gear (17) is meshingly connected to the second gear (22); and the diameter of the first gear (17) is smaller than that of the second gear (22).

5. The bidirectionally driven multi-head towel embroidery machine according to claim 3, characterized in that: The first moving block (24) is connected to the first guide shaft (23) at the upper and lower sides of the first mounting hole (18) respectively.

6. The bidirectionally driven multi-head towel embroidery machine according to claim 1, characterized in that: The second driving device comprises a second motor (15), the second motor (15) drives the second color-changing cam shaft (36) to rotate via a second gear set, a spiral second track (31) is provided on the outer periphery of the second color-changing cam shaft (36), a second roller (35) is embedded in the second track (31) and runs along the second track (31), the second roller (35) is connected to the third mounting hole (14) of the second moving block (13), and the fourth mounting hole (12) of the second moving block (13) is connected to the second pull rod (5).

7. The bidirectionally driven multi-head towel embroidery machine according to claim 6, characterized in that: The second gear set comprises a third gear (28) connected to the second motor (15) and a fourth gear (29) connected to the second color-changing camshaft (36); the third gear (28) is meshingly connected to the fourth gear (29); and the diameter of the third gear (28) is smaller than that of the fourth gear (29).

8. The bidirectionally driven multi-head towel embroidery machine according to claim 6, characterized in that: The second moving block (13) is connected to the second guide shaft (30) at the upper and lower sides of the fourth mounting hole (12) respectively.

9. The bidirectionally driven multi-head towel embroidery machine according to claim 7, characterized in that: One end of the second color-changing cam shaft (36) is connected to the fourth gear (29), and the other end is connected to the fifth gear (34); the fifth gear (34) is meshedly connected to the sixth gear (32); the sixth gear (32) is connected to the position sensor (20) of the second color-changing cam shaft via a connecting shaft (33).

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