Stroke adjustment mechanism, stroke adjustment system, and stroke adjustment control method

Abstract

The application discloses a stroke adjusting mechanism, a stroke adjusting system and a stroke adjusting control method, and relates to the technical field of sewing machines. The stroke adjusting mechanism comprises an executing part, a transmission assembly and an adjusting assembly. The transmission assembly is used for driving the executing part to reciprocate, and the adjusting assembly is used for adjusting the stroke of the executing part. The transmission assembly comprises a rocker, the rocker has a first connecting point, and the rocker can rotate around the first connecting point. The adjusting assembly comprises an adjusting main shaft and an adjusting arm. The first end of the adjusting arm is fixedly connected with the adjusting main shaft, the second end of the adjusting arm is located outside the axis of the adjusting main shaft, and the second end of the adjusting arm is rotationally connected with the first connecting point. The stroke of the executing part is adjusted by adjusting the rotating point position of the rocker, the stroke adjusting operation does not need to stop and disassemble, the operation is simple, and the stroke of the executing part can be steplessly adjusted.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and in particular to a stroke adjustment mechanism, a stroke adjustment system, and a stroke adjustment control method. Background Technology

[0002] The presser foot is one of the core components of a sewing machine. Driven by the transmission mechanism, it moves up and down reciprocatingly. Its function is to press and hold the fabric during the sewing process to ensure that the fabric is flat and thus ensure the stability of the stitches.

[0003] To accommodate fabrics of varying thicknesses, the presser foot's vertical travel needs adjustment. Currently, adjusting the presser foot on a sewing machine requires stopping the machine, loosening screws or disassembling the connecting rod pin, and changing the hinge hole position. This is cumbersome, time-consuming, and impacts work efficiency. Furthermore, because the hole position is fixed, only stepped adjustments are possible, preventing precise stepless fine-tuning. Summary of the Invention

[0004] This invention provides a stroke adjustment mechanism, a stroke adjustment system, and a stroke adjustment control method, aiming to solve the technical problems of cumbersome operation and inability to steplessly adjust the presser foot of a sewing machine.

[0005] To achieve the above objectives, the first aspect of the present invention provides a stroke adjustment mechanism, including an actuator, a transmission assembly, and an adjustment assembly;

[0006] The transmission assembly is used to drive the actuator to reciprocate, and the adjustment assembly is used to adjust the stroke of the actuator to reciprocate.

[0007] The transmission assembly includes a rocker arm having a first connection point, and the rocker arm is rotatable about the first connection point;

[0008] The adjustment assembly includes an adjustment spindle and an adjustment arm. The first end of the adjustment arm is fixedly connected to the adjustment spindle, and the second end of the adjustment arm is located outside the axis of the adjustment spindle. The second end of the adjustment arm is rotatably connected to the first connection point. When the adjustment arm rotates with the adjustment spindle, it can adjust the position of the first connection point.

[0009] By adjusting the spindle to drive the adjusting arm to rotate, the position of the first connection point that is rotatably connected to the second end of the adjusting arm is changed, thereby adjusting the position of the rocker arm's rotation fulcrum. This, in turn, adjusts the reciprocating stroke of the actuator (presser foot) driven by the transmission component. The stroke adjustment operation does not require stopping or disassembling, is simple to operate, and has minimal impact on work efficiency. Moreover, since the position of the first connection point can be steplessly adjusted within the design range, stepless adjustment of the actuator's stroke can be achieved.

[0010] Preferably, the adjustment assembly further includes a worm gear, a worm, and a first driving member. The worm gear meshes with the worm and is coaxially and fixedly connected to the adjustment main shaft. The worm is fixedly connected to the output end of the first driving member, and the first driving member can drive the worm to rotate.

[0011] The worm gear transmission pair not only provides a large reduction ratio, enabling the first drive component to precisely control the rotation angle of the adjusting spindle and achieve fine-tuning of the stroke, but its reverse self-locking characteristic also ensures that the reverse impact force of the transmission component cannot drive the adjusting spindle to rotate, keeping the adjusting arm in a fixed position during operation, thereby guaranteeing the stability and reliability of the actuator. Furthermore, this structure is compact and easy to integrate into existing sewing machine systems.

[0012] Preferably, the transmission assembly further includes an input assembly and an output assembly, the input assembly being connected to a first end of the rocker arm, and the output assembly being connected to a second end of the rocker arm;

[0013] The input component is used to drive the joystick to rotate around the first connection point. When the joystick rotates around the first connection point, it drives the actuator to reciprocate through the output component.

[0014] The input component, the rocker arm, and the output component form a transmission path. The rocker arm is connected in series between the input component and the output component. With the input of the input component remaining unchanged, the output of the output component is changed by changing the position of the fulcrum (first connection point) of the rocker arm, thereby realizing the stroke adjustment of the actuator.

[0015] Preferably, the input component includes an input spindle, an eccentric wheel, and a first connecting rod. The eccentric wheel is fixedly connected to the input spindle. The first end of the first connecting rod is rotatably connected to the eccentric wheel, and the second end is rotatably connected to the first end of the rocker arm. The connection point between the first connecting rod and the eccentric wheel is eccentric relative to the axis of the input spindle.

[0016] The eccentric wheel converts the continuous rotational motion of the input spindle into the reciprocating oscillation of the first link, which is then transmitted to the rocker arm. Because the eccentricity is fixed, the input amplitude of the first link remains constant, providing a constant input condition for precise control.

[0017] Preferably, the output component includes a second link, a rotating shaft, a third link, a fourth link, a fifth link, a sixth link, a slider, and a synchronizing rod;

[0018] The side wall of the rotating shaft is fixed with an ear plate, the first end of the second connecting rod is rotatably connected to the second end of the rocker arm, and the second end of the second connecting rod is rotatably connected to the ear plate; when the rocker arm rotates around the first connection point, it drives the rotating shaft to rotate through the second connecting rod.

[0019] The first end of the third link is fixedly connected to the rotating shaft, the second end of the third link is rotatably connected to the first end of the fourth link, the second end of the fourth link is rotatably connected to the first end of the fifth link, the fifth link has a second connection point, the second connection point is rotatably connected to a fixed structure, and the rotating shaft can drive the fifth link to rotate around the second connection point through the third link and the fourth link;

[0020] The second end of the fifth link is rotatably connected to the first end of the sixth link, and the second end of the sixth link is rotatably connected to the slider; when the fifth link rotates around the second connection point, it drives the slider to reciprocate along a straight line through the sixth link.

[0021] Both the slider and the actuator are fixedly connected to the synchronizing rod, and the slider drives the actuator to reciprocate along a straight line through the synchronizing rod.

[0022] This multi-stage linkage transmission chain can achieve multiple conversions of motion direction, force amplification, and stroke matching, adapting to different internal space layouts of sewing machines and possessing extremely high flexibility. At the same time, the combination of the slider and the synchronizing rod ensures the straightness and stability of the actuator's movement and improves the positioning accuracy of the presser foot lifting.

[0023] Preferably, the rocker arm is V-shaped, and the first connection point is located at the apex of the rocker arm.

[0024] Preferably, the fifth link is V-shaped, and the second connection point is located at the apex of the fifth link.

[0025] The V-shaped design achieves a large swing angle range within a limited space. Moreover, the size of the apex angle and the length of the two arms can be flexibly designed according to the position and layout of the input and output ends, enhancing the adaptability of the mechanism.

[0026] A second aspect of the present invention provides a stroke adjustment system, comprising the stroke adjustment mechanism described in any one of the first aspects, a central main control unit, a human-machine interaction module, an environmental perception module, a status detection module, and a motor drive module;

[0027] The human-computer interaction module is used to receive user instructions and send the user instructions to the central main control unit;

[0028] The environmental sensing module is used to collect workpiece data information and send the workpiece data information to the central main control unit;

[0029] The status detection module is used to detect the deflection angle data of the adjustment spindle and send the deflection angle data to the central main control unit;

[0030] The central control unit is used to generate control commands based on the user instructions, workpiece data information, or deflection angle data, and send the control commands to the motor drive module.

[0031] The motor drive module is used to control the first drive component to move according to the control command, so as to adjust the reciprocating stroke of the actuator.

[0032] This system achieves fully automated closed-loop control of stroke adjustment, supports multiple modes including manual input, automatic sensing, and feedback correction, and can dynamically adjust online without stopping the machine. This significantly improves the intelligence level and production efficiency of sewing equipment, while reducing the need for manual intervention by operators.

[0033] A third aspect of the present invention provides a stroke adjustment control method, applied to the stroke adjustment system described in the second aspect, comprising the following steps:

[0034] S1. The environmental perception module collects the workpiece data information in real time and sends the workpiece data information to the central main control unit;

[0035] S2. The central control unit determines whether the workpiece data information has changed;

[0036] S3. If the judgment result is yes, the central main control unit calculates the reciprocating motion stroke of the actuator and the corresponding target deflection angle of the adjustment spindle based on the changed workpiece data information.

[0037] S4. The central control unit determines whether the current state is within the system's preset safety adjustment window;

[0038] S5. If the judgment result is yes, the central main control unit generates the control command and sends the control command to the motor drive module;

[0039] S6. The motor drive module drives the first drive component to move according to the control command, so that the adjustment spindle rotates to the target deflection angle;

[0040] S7. The state detection module collects the deflection angle data of the adjustment spindle in real time and sends the deflection angle data to the central main control unit. The central main control unit determines whether the deflection angle data is consistent with the target deflection angle.

[0041] S8. If the result is negative, return to S6; if the result is positive, return to S1.

[0042] This method achieves closed-loop control of "detection → decision → execution → feedback", ensuring the accuracy of stroke adjustment and enabling online dynamic adjustment to achieve automated adjustment. It introduces a safety adjustment window judgment to avoid adjustment at moments when mechanical interference or dangerous conditions may occur, thus improving the safety of the system. The real-time feedback verification link can effectively eliminate control errors and mechanical backlash, ensuring that the adjustment spindle accurately reaches the target position.

[0043] Preferably, before performing step S1, the method further includes the following step:

[0044] S0, the central control unit performs system initialization.

[0045] Initialization ensures that after the system is powered on or reset, the central control unit, sensor modules, motor drive modules, and adjustment spindle are all in a clear and known state, providing a reliable reference for subsequent adjustments and avoiding uncontrolled adjustments caused by uncertain initial states. This is the foundation for ensuring the accurate operation of the entire automatic adjustment process. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0047] Figure 1 Schematic diagram of the stroke adjustment mechanism Figure 1 ;

[0048] Figure 2 Schematic diagram of the stroke adjustment mechanism Figure 2 ;

[0049] Figure 3 This is a schematic diagram of the adjusting arm.

[0050] Figure 4 This is a schematic diagram of the joystick structure;

[0051] Figure 5 Here is a block diagram of the stroke adjustment system;

[0052] Figure 6 This is a flowchart of the stroke adjustment control method.

[0053] Explanation of reference numerals in the attached figures:

[0054] Actuator 1, rocker arm 2, first connection point 3, adjusting spindle 4, adjusting arm 5, worm gear 6, worm 7, first drive component 8, input spindle 9, eccentric wheel 10, first connecting rod 11, second connecting rod 12, rotating shaft 13, third connecting rod 14, fourth connecting rod 15, fifth connecting rod 16, sixth connecting rod 17, slider 18, synchronizing rod 19, ear plate 20, second connection point 21, keyway 22. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] The following provides some embodiments of the travel adjustment mechanism.

[0058] refer to Figure 1 and Figure 2 In some embodiments, the stroke adjustment mechanism includes an actuator 1, a transmission assembly, and an adjustment assembly; the transmission assembly drives the actuator 1 to reciprocate, and the adjustment assembly adjusts the stroke of the actuator 1's reciprocating motion. It should be noted that the embodiments in this specification use a sewing machine presser foot as the actuator 1, and the reciprocating motion refers to the linear reciprocating motion of the presser foot; however, this does not constitute a limitation on the invention. In fact, the stroke adjustment mechanism of the present invention has wide applicability. In other embodiments, the actuator 1 can also be other mechanical components that require adjustment of the reciprocating motion stroke. Correspondingly, the reciprocating motion is not limited to linear reciprocating motion, but can also be oscillating reciprocating motion.

[0059] The transmission assembly includes a rocker arm 2, which has a first connection point 3. The rocker arm 2 can rotate around the first connection point 3, that is, the first connection point 3 serves as the rotation fulcrum of the rocker arm 2. One end of the rocker arm 2 serves as the input end, and the other end serves as the output end. As a component of the transmission assembly, the rocker arm 2 changes the position of its rotation fulcrum. This change in the position of the rotation fulcrum directly alters the lever arm ratio between the input and output ends of the rocker arm 2, thereby changing the stroke ratio between the input and output ends. With the input at the input end remaining constant, the output stroke at the output end is changed, thus realizing the stroke adjustment of the actuator 1.

[0060] The adjustment assembly includes an adjustment spindle 4 and an adjustment arm 5. The first end of the adjustment arm 5 is fixedly connected to the adjustment spindle 4, and the second end of the adjustment arm 5 is located outside the axis of the adjustment spindle 4. The second end of the adjustment arm 5 is rotatably connected to the first connection point 3. When the adjustment arm 5 rotates with the adjustment spindle 4, it can adjust the position of the first connection point 3.

[0061] refer to Figure 3 For example, the first end of the adjusting arm 5 has a keyway 22, and the adjusting spindle 4 has a flat key. The adjusting arm 5 is sleeved on the adjusting spindle 4, and the keyway 22 and key achieve a non-rotational engagement between the adjusting arm 5 and the adjusting spindle 4. The axial fixation of the adjusting arm 5 is achieved by a limiting shoulder and a limiting nut to prevent the adjusting arm 5 from slipping. Alternatively, the adjusting arm 5 can also be fixedly connected to the adjusting spindle 4 by welding or set screws. In short, as long as the adjusting arm 5 can swing synchronously with the adjusting spindle 4 without relative rotation, it is acceptable. The second end of the adjusting arm 5 extends radially along the adjusting spindle 4, and the second end of the adjusting arm 5 is rotatably connected to the first connection point 3 of the rocker arm 2 by a pin. When the adjusting spindle 4 rotates, the adjusting arm 5 swings synchronously with it, thereby moving the first connection point 3 of the rocker arm 2, that is, changing the position of the rotation fulcrum of the rocker arm 2.

[0062] In some embodiments, the adjustment assembly further includes a worm gear 6, a worm 7, and a first drive member 8. The worm gear 6 meshes with the worm 7, the worm gear 6 is coaxially and fixedly connected to the adjustment main shaft 4, the worm 7 is fixedly connected to the output end of the first drive member 8, and the first drive member 8 can drive the worm 7 to rotate.

[0063] For example, the first driving component 8 is a servo motor, whose output shaft is coaxially and fixedly connected to the worm gear 7 via a coupling. The worm wheel 6 is fixedly sleeved on the adjusting spindle 4 and meshes with the worm gear 7. The servo motor drives the worm gear 7 to rotate, and after being reduced in speed by the worm wheel 6, it drives the adjusting spindle 4 to rotate. Since the worm wheel 6 and worm gear 7 mechanism has a large reduction ratio, it can achieve precise control of the angle of the adjusting spindle 4. At the same time, the transmission pair of the worm wheel 6 and worm gear 7 has a reverse self-locking characteristic. When the sewing machine is running at high speed, the reverse impact force generated by the transmission component cannot overcome the self-locking torque of the worm wheel 6 and worm gear 7. Therefore, the adjusting spindle 4 will not rotate passively, and the adjusting arm 5 remains rigidly fixed, ensuring the stability of the presser foot stroke. In some alternative embodiments, a gear set can also be used to realize the reduction transmission between the first driving component 8 and the adjusting spindle 4. Furthermore, a brake can be set to lock the adjusting spindle 4.

[0064] It should be noted that the first driving component 8 is not limited to a servo motor or a stepper motor, which directly outputs rotary motion. In some embodiments, the first driving component 8 can also be a cylinder, hydraulic cylinder, electric cylinder, or other driving component that outputs linear motion. The execution motion of the first driving component 8 is converted into the rotation of the adjusting spindle 4 through a transmission mechanism such as a gear and rack.

[0065] In some embodiments, the transmission assembly further includes an input component and an output component. The input component is connected to the first end of the rocker arm 2 and is used to drive the rocker arm 2 to rotate around the first connection point 3. The output component is connected to the second end of the rocker arm 2. When the rocker arm 2 rotates around the first connection point 3, it drives the actuator 1 to reciprocate through the output component. It should be noted that the input component and the output component can have various specific implementations, as long as they satisfy the above-described motion transmission relationship. For example, the input component can be a crank-rocker arm 2 mechanism, a cam mechanism, etc.; the power source of the input component is not limited to the sewing machine spindle, but can also be an independent motor, cylinder, or hydraulic motor. The output component can be a connecting rod, a gear and rack mechanism, etc., and its output motion can be linear reciprocating motion, oscillating reciprocating motion, or rotary reciprocating motion.

[0066] In some embodiments, the input component includes an input spindle 9, an eccentric wheel 10, and a first connecting rod 11. The input spindle 9 is driven to rotate by the main motor of the sewing machine. The eccentric wheel 10 is fixedly connected to the input spindle 9. The first end of the first connecting rod 11 is rotatably connected to the eccentric wheel 10, and the second end is rotatably connected to the first end of the rocker arm 2 via a pin. The connection point between the first connecting rod 11 and the eccentric wheel 10 is eccentric relative to the axis of the input spindle 9, that is, the rotation axis of the first end of the first connecting rod 11 has a fixed eccentricity with the axis of the input spindle 9. Preferably, a bearing is provided between the first end of the first connecting rod 11 and the eccentric wheel 10 to reduce friction. When the input spindle 9 rotates, the eccentric wheel 10 drives the first connecting rod 11 to reciprocate, which in turn drives the rocker arm 2 to reciprocate. Since the eccentricity is fixed, the swing amplitude of the input component is a constant value, providing stable input conditions for stroke adjustment.

[0067] In some embodiments, the output component adopts a multi-stage linkage transmission structure, including a second link 12, a rotating shaft 13, a third link 14, a fourth link 15, a fifth link 16, a sixth link 17, a slider 18, and a synchronizing rod 19.

[0068] The rotating shaft 13 is rotatably mounted on a fixed structure such as a housing, and an ear plate 20 is fixed to its side wall. The ear plate 20 extends radially along the rotating shaft 13. The first end of the second connecting rod 12 is rotatably connected to the second end of the rocker arm 2 via a pin shaft. The second end of the second connecting rod 12 is rotatably connected to the ear plate 20 via a pin shaft. When the rocker arm 2 rotates around the first connection point 3, it drives the rotating shaft 13 to rotate through the second connecting rod 12.

[0069] The first end of the third link 14 is fixedly connected to the rotating shaft 13, for example, by means of splines, flat keys, locking screws, welding, etc., as long as the third link 14 can rotate synchronously with the rotating shaft 13. The second end of the third link 14 is rotatably connected to the first end of the fourth link 15 via a pin. The second end of the fourth link 15 is rotatably connected to the first end of the fifth link 16 via a pin. The fifth link 16 has a second connection point 21, which is rotatably connected to a fixed structure such as a support on the housing, allowing the fifth link 16 to swing around the second connection point 21. The rotating shaft 13 can drive the fifth link 16 to rotate around the second connection point 21 through the third link 14 and the fourth link 15.

[0070] The second end of the fifth link 16 is rotatably connected to the first end of the sixth link 17 via a pin, and the second end of the sixth link 17 is rotatably connected to the slider 18 via a pin. When the fifth link 16 rotates around the second connection point 21, it drives the slider 18 to reciprocate in a straight line through the sixth link 17. It should be noted that the slider 18 is restricted to a linear guide structure and can only perform linear reciprocating motion. For example, the linear guide structure is a guide rail, a slide, etc.

[0071] Both the slider 18 and the actuator 1 are fixedly connected to the synchronizing rod 19. The slider 18 drives the actuator 1 to reciprocate in a straight line via the synchronizing rod 19. Exemplarily, the synchronizing rod 19 is usually a rigid long rod. The slider 18 passes through the synchronizing rod 19 and is fixed by locking screws. The pressure foot is detachably fixed to the lower end of the synchronizing rod 19 by screws.

[0072] When the rocker arm 2 drives the rotating shaft 13 to swing back and forth via the second link 12, the rotating shaft 13 drives the fifth link 16 to swing around the second connection point 21 via the third link 14 and the fourth link 15 in sequence. The fifth link 16 then pushes the slider 18 to move back and forth along the linear guide structure via the sixth link 17. The slider 18 drives the pressure foot to rise and fall synchronously via the synchronizing rod 19.

[0073] It should be noted that in some other embodiments, some components in the output assembly can be omitted depending on the different requirements of the position and action of the actuator 1. In fact, the second link 12, the rotating shaft 13, the third link 14, the fourth link 15, the fifth link 16, the sixth link 17, the slider 18, the synchronizing rod 19, etc., essentially constitute a transmission chain. Any component in this transmission chain can be connected to the actuator 1 as the final output end, driving the actuator 1 in the form of linear motion, oscillation, or rotational motion. The output point can be flexibly selected according to the actual spatial layout and motion requirements. For example, the actuator 1 can be directly fixed on the rotating shaft 13. At this time, the reciprocating rotational motion of the rotating shaft 13 is directly output to the actuator 1, which is suitable for occasions where the actuator 1 needs to oscillate back and forth.

[0074] refer to Figure 4 In some embodiments, the rocker arm 2 is V-shaped, with the first connection point 3 located at the apex of the rocker arm 2. The fifth link 16 is also V-shaped, with the second connection point 21 located at the apex of the fifth link 16. The V-shaped design achieves a large swing angle range within a limited space, and the size of the apex angle and the length of the two arms can be flexibly designed according to the position and layout of the input and output ends, enhancing the adaptability of the mechanism.

[0075] It should be noted that the shape of the rocker arm 2 is not limited to a V-shape. In some other embodiments, it can also be an L-shape, an arc shape, or a plate. The first connection point 3, the connection point with the first link 11, and the connection point with the second link 12 are usually arranged in a triangular layout. Similarly, the shape of the fifth link 16 is not limited to a V-shape. In some other embodiments, it can also be an L-shape, an arc shape, or a plate. The second connection point 21, the connection point with the fourth link 15, and the connection point with the sixth link 17 are usually arranged in a triangular layout.

[0076] The following provides some embodiments of the travel adjustment system.

[0077] refer to Figure 5 In some embodiments, the stroke adjustment system includes the stroke adjustment mechanism and central control unit, human-machine interaction module, environmental perception module, status detection module, and motor drive module as described in any of the above embodiments.

[0078] For example, the human-machine interaction module may be a touch screen, a button panel or a knob, used to receive user instructions such as the expected stroke or operating parameters of the actuator 1, and send these user instructions to the central control unit.

[0079] The environmental sensing module is used to collect workpiece data and send it to the central control unit. For example, the environmental sensing module is a laser thickness sensor installed in front of the sewing machine presser foot to detect changes in the thickness of the material to be sewn in real time and send the thickness data to the central control unit. It should be noted that the environmental sensing module is not limited to a laser sensor, and the physical quantity it detects is not limited to thickness. In some other embodiments, ultrasonic sensors, contact displacement sensors, or vision sensors can also be used, and the physical quantity detected can also be material hardness, density, or other parameters affecting the stroke of actuator 1.

[0080] The status detection module is used to detect the deflection angle data of the adjusting spindle 4 and send the deflection angle data to the central control unit. For example, the status detection module can be an angle sensor, installed at the end of the adjusting spindle 4 or on the side of the worm gear 6, to detect the deflection angle of the adjusting spindle 4 in real time, thereby providing feedback on the current set value of the stroke of the actuator 1. Alternatively, the status detection module can also be integrated into the encoder of the servo motor, indirectly calculating the angle of the adjusting spindle 4 through the motor rotation angle.

[0081] The central control unit is used to generate control commands according to the user instructions, workpiece data information, or deflection angle data, based on a preset control algorithm. The control commands typically include adjusting the angle and direction of the spindle 4 rotation and sending the control commands to the motor drive module.

[0082] The motor drive module is used to control the first drive component 8 to adjust the reciprocating stroke of the actuator 1 according to the control command. For example, the motor drive module is a servo driver, the first drive component 8 is a servo motor, and after receiving the control command from the central main control unit, the servo driver controls the servo motor to move precisely, driving the adjustment spindle 4 to rotate to the target angle.

[0083] Preferably, the travel adjustment system may also include an alarm module that provides audible and visual alerts when the travel adjustment exceeds the safe range or a malfunction occurs.

[0084] The following provides some embodiments of the stroke adjustment control method, which is applied to the stroke adjustment system in the above embodiments.

[0085] refer to Figure 6 In some embodiments, the stroke adjustment control method includes the following steps:

[0086] The environmental sensing module collects workpiece data in real time and sends the workpiece data to the central control unit; for example, the laser thickness sensor collects the fabric thickness value every 10 milliseconds and sends the fabric thickness value to the central control unit.

[0087] The central control unit determines whether the workpiece data has changed; for example, whether the difference between the thickness value collected previously exceeds a preset threshold.

[0088] If the judgment result is yes, it means that the workpiece state has changed significantly and the stroke of actuator 1 needs to be adjusted. The central main control unit calculates the required reciprocating stroke of actuator 1 through the built-in mathematical model or lookup table based on the changed workpiece data information. Then, based on the calibration relationship between the stroke and the angle of the adjustment spindle 4, it calculates the corresponding target deflection angle of the adjustment spindle 4.

[0089] Before the central control unit generates control commands or issues adjustment commands to the motor drive module, it first determines whether the current position is within the system's preset safe adjustment window. For example, the safe adjustment window refers to the time period when the presser foot is not in contact with the fabric, preferably when the presser foot has just left the fabric and is at the starting point of the lifting motion. If the presser foot is pressing against the fabric and the needle is embedded in the fabric, the stroke cannot be forcibly adjusted at this time; adjustment must be made only after the presser foot leaves the fabric. For example, since the up-and-down movement of the presser foot has a fixed phase relationship with the rotation angle of the spindle, an angle sensor can be installed on the sewing machine's spindle to detect the spindle's rotation angle in real time, thereby determining the height position of the presser foot. Combined with the fabric thickness collected by the environmental sensing module, it can be determined whether the position is within the safe adjustment window. Alternatively, a non-contact displacement sensor can be installed on the presser foot. When the sensor detects that the distance between the presser foot and the fabric is greater than zero and the pressing distance is increasing, it is determined that the position is within the safe adjustment window.

[0090] If the central control unit determines that the current adjustment window is safe, the central control unit generates a control command and sends the control command to the motor drive module. The motor drive module drives the first drive component 8 to move according to the control command, so that the adjustment spindle 4 rotates to the target deflection angle.

[0091] During and after the adjustment process, the deflection angle data of the adjustment spindle 4 is collected in real time by the status detection module and sent to the central control unit. The central control unit determines whether the deflection angle data is consistent with the target deflection angle. If the result is inconsistent, the drive steps are repeated until the angle is consistent. If consistent, the workpiece data is collected again and the system waits to enter the next adjustment cycle.

[0092] In some embodiments, before the environmental sensing module first acquires workpiece data, the central control unit performs system initialization. Exemplarily, system initialization includes resetting and configuring registers, memory, communication ports, etc.; and performing communication and self-testing on the human-machine interface module, environmental sensing module, status detection module, and motor drive module to confirm that each module is working properly. Optionally, system initialization may further include driving the adjusting spindle 4 to a preset initial angle position, i.e., performing a zero-return operation, to establish a clear initial state reference for subsequent operations.

[0093] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0094] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A stroke adjustment mechanism, characterized in that, Includes actuator (1), transmission assembly and adjustment assembly; The transmission assembly is used to drive the actuator (1) to reciprocate, and the adjustment assembly is used to adjust the stroke of the actuator (1) to reciprocate; The transmission assembly includes a rocker arm (2) having a first connection point (3) and the rocker arm (2) being rotatable about the first connection point (3); The adjustment assembly includes an adjustment spindle (4) and an adjustment arm (5). The first end of the adjustment arm (5) is fixedly connected to the adjustment spindle (4), and the second end of the adjustment arm (5) is located outside the axis of the adjustment spindle (4). The second end of the adjustment arm (5) is rotatably connected to the first connection point (3). When the adjustment arm (5) rotates with the adjustment spindle (4), it can adjust the position of the first connection point (3).

2. The stroke adjustment mechanism according to claim 1, characterized in that, The adjustment assembly further includes a worm gear (6), a worm (7) and a first drive member (8). The worm gear (6) meshes with the worm (7). The worm gear (6) is coaxially and fixedly connected to the adjustment main shaft (4). The worm (7) is fixedly connected to the output end of the first drive member (8). The first drive member (8) can drive the worm (7) to rotate.

3. The stroke adjustment mechanism according to claim 2, characterized in that, The transmission assembly further includes an input component and an output component, wherein the input component is connected to the first end of the rocker arm (2) and the output component is connected to the second end of the rocker arm (2); The input component is used to drive the rocker arm (2) to rotate around the first connection point (3). When the rocker arm (2) rotates around the first connection point (3), the output component drives the actuator (1) to reciprocate.

4. The stroke adjustment mechanism according to claim 3, characterized in that, The input component includes an input spindle (9), an eccentric wheel (10), and a first connecting rod (11). The eccentric wheel (10) is fixedly connected to the input spindle (9). The first end of the first connecting rod (11) is rotatably connected to the eccentric wheel (10), and the second end is rotatably connected to the first end of the rocker arm (2). The connection point between the first connecting rod (11) and the eccentric wheel (10) is eccentric relative to the axis of the input spindle (9).

5. The stroke adjustment mechanism according to claim 3, characterized in that, The output component includes a second link (12), a rotating shaft (13), a third link (14), a fourth link (15), a fifth link (16), a sixth link (17), a slider (18), and a synchronizing rod (19). The side wall of the rotating shaft (13) is fixed with an ear plate (20). The first end of the second connecting rod (12) is rotatably connected to the second end of the rocker arm (2). The second end of the second connecting rod (12) is rotatably connected to the ear plate (20). When the rocker arm (2) rotates around the first connection point (3), it drives the rotating shaft (13) to rotate through the second connecting rod (12). The first end of the third link (14) is fixedly connected to the rotating shaft (13), the second end of the third link (14) is rotatably connected to the first end of the fourth link (15), the second end of the fourth link (15) is rotatably connected to the first end of the fifth link (16), the fifth link (16) has a second connection point (21), the second connection point (21) is rotatably connected to a fixed structure, and the rotating shaft (13) can drive the fifth link (16) to rotate around the second connection point (21) through the third link (14) and the fourth link (15); The second end of the fifth link (16) is rotatably connected to the first end of the sixth link (17), and the second end of the sixth link (17) is rotatably connected to the slider (18); when the fifth link (16) rotates around the second connection point (21), it drives the slider (18) to reciprocate along a straight line through the sixth link (17); Both the slider (18) and the actuator (1) are fixedly connected to the synchronizing rod (19). The slider (18) drives the actuator (1) to reciprocate along a straight line through the synchronizing rod (19).

6. The stroke adjustment mechanism according to claim 2, characterized in that, The rocker arm (2) is V-shaped, and the first connection point (3) is located at the apex of the rocker arm (2).

7. The stroke adjustment mechanism according to claim 5, characterized in that, The fifth link (16) is V-shaped, and the second connection point (21) is located at the apex of the fifth link (16).

8. A stroke adjustment system, characterized in that, Includes the stroke adjustment mechanism and central control unit, human-machine interaction module, environmental perception module, status detection module, and motor drive module as described in any one of claims 2-7; The human-computer interaction module is used to receive user instructions and send the user instructions to the central main control unit; The environmental sensing module is used to collect workpiece data information and send the workpiece data information to the central main control unit; The status detection module is used to detect the deflection angle data of the adjustment spindle (4) and send the deflection angle data to the central control unit; The central control unit is used to generate control commands based on the user instructions, workpiece data information, or deflection angle data, and send the control commands to the motor drive module. The motor drive module is used to control the first drive element (8) to move according to the control command, so as to adjust the reciprocating motion stroke of the actuator (1).

9. A stroke adjustment control method, characterized in that, The stroke adjustment system described in claim 8 is applied to the following steps: S1. The environmental perception module collects the workpiece data information in real time and sends the workpiece data information to the central main control unit; S2. The central control unit determines whether the workpiece data information has changed; S3. If the judgment result is yes, the central main control unit calculates the reciprocating motion stroke of the actuator (1) and the target deflection angle of the corresponding adjustment spindle (4) based on the changed workpiece data information. S4. The central control unit determines whether the current state is within the system's preset safety adjustment window; S5. If the judgment result is yes, the central main control unit generates the control command and sends the control command to the motor drive module; S6. The motor drive module drives the first drive component (8) to move according to the control command, so that the adjustment spindle (4) rotates to the target deflection angle; S7. The state detection module collects the deflection angle data of the adjustment spindle (4) in real time and sends the deflection angle data to the central control unit. The central control unit determines whether the deflection angle data is consistent with the target deflection angle. S8. If the result is negative, return to S6; if the result is positive, return to S1.

10. The stroke adjustment control method according to claim 9, characterized in that, Before performing step S1, the following steps are also included: S0, the central control unit performs system initialization.

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