Digitizing machine for overlock sewing machine
Patent Information
- Application Number
- CN202521911941.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-05
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-09-05
AI Technical Summary
现有的包缝机在剪线、抬压脚、牙齿高度调节、针具调节、差动比调节、压脚压力调节以及剪线控制等多个关键功能上存在明显缺陷，难以满足当今纺织服装等行业对于高效、精准、智能化生产的迫切需求
本实用新型提供了一种数字化包缝机，采用高度集成化的机电一体化设计：采用双步进电机架构分别驱动多组执行机构，实现了剪线、抬压脚、牙齿高度、针距、差动比及压脚压力等核心功能的精准数字化控制；通过凸轮错位套装与棘轮-棘爪机构的结合，实现了单一电机按特定旋转方向和顺序依次驱动多个动作，不仅简化了机械结构，降低了制造成本，更极大地提高了动作可靠性和重复精度；引入压脚高度检测装置与面料感应装置，使设备具备了智能感知与自适应调节能力，能实时检测压脚提升高度和面料位置，并据此自动调节压脚压力、精准控制剪线时机，提升缝纫品质的一致性。因此，本实用新型极大地提升了包缝机的自动化程度、生产效率和缝制质量，满足了现代纺织服装行业对高效、精准与智能化生产的核心需求。
Smart Images
Figure CN224833140U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of sewing machines, and relates to a digital overlock sewing machine. Background Technology
[0002] In the textile and apparel industries, overlock sewing machines are crucial equipment for binding and sewing the edges of fabrics. They are widely used in the processing of various fabrics to prevent fraying at the edges and ensure the structural strength and appearance quality of the fabric. With the development of the industry, increasingly higher demands are being placed on the performance and automation level of overlock sewing machines. Existing overlock sewing machines have significant deficiencies in several key functions, including thread trimming, presser foot lifting, dog height adjustment, needle adjustment, differential ratio adjustment, presser foot pressure adjustment, and thread trimming control, making it difficult to meet the urgent needs of today's textile and apparel industries for efficient, precise, and intelligent production. Therefore, developing a new type of overlock sewing machine that integrates a high-efficiency stepper motor drive, achieves multi-functional precise control, and is equipped with advanced detection devices for precise thread trimming control has significant practical significance and market value. Utility Model Content
[0003] This invention addresses the shortcomings of existing technologies by providing a digital overlock sewing machine that achieves multi-functional and precise control of the machine.
[0004] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: A digital overlock sewing machine, comprising: Stepper motor one, which is connected to the wire cutting device, the presser foot lifting device, and the tooth height adjustment device and drives their respective actions; Stepper motor two, which is connected to the needle pitch adjustment device, the differential ratio adjustment device, and the presser foot pressure adjustment device and drives them to operate respectively; A presser foot height detection device, comprising a sensing block and a sensor, wherein the sensing block is disposed on the presser foot rod and the sensor is disposed on the housing; A fabric sensing device, comprising a sensing beam mechanism including a signal transmitter and multiple sensing receivers, wherein the sensing receivers are arranged in different areas of the workbench.
[0005] In the aforementioned digital overlock sewing machine, a thread-cutting cam for driving the thread-cutting device, a presser foot-lifting cam for driving the presser foot device, and a tooth height-adjusting cam for driving the tooth height-adjusting device are offsetly mounted on the motor shaft of the stepper motor. When the stepper motor rotates counterclockwise, it drives the thread-cutting device; when it rotates clockwise, it drives the presser foot-lifting device and the tooth height-adjusting device sequentially. In this invention, the thread-cutting device, presser foot-lifting device, and tooth height-adjusting device all employ conventional cam-driven devices available in the art. The tooth height-adjusting device is the device that enables the downward arching of the teeth.
[0006] In the aforementioned digital overlock sewing machine, a rotatable ratchet is mounted on the motor shaft of the stepper motor, and a pawl that cooperates with the ratchet is provided on the motor mounting plate. The tooth height adjustment cam drives the ratchet to rotate through the ratchet pin to switch the tooth height adjustment gear. Furthermore, after the tooth height adjustment cam achieves the tooth arching function, it can continue to rotate to drive the ratchet to rotate and achieve multiple tooth height adjustments.
[0007] In the aforementioned digital overlock sewing machine, the first shaft end of the stepper motor two is provided with a drive cam, and the second shaft end is provided with a presser foot pressure adjusting cam. The drive cam is driven by the stepper motor two to drive the stitch length adjustment device when rotating clockwise and to drive the differential ratio adjustment device when rotating counterclockwise. The presser foot pressure adjusting cam drives the presser foot pressure adjusting device. In this utility model, the stitch length adjustment device, the differential ratio adjustment device, and the presser foot pressure adjusting device all adopt conventional cam-driven devices available in the art.
[0008] In the aforementioned digital overlock sewing machine, the stitch length adjustment device includes a top pin for unlocking the stitch length adjustment component. The top pin is slidably disposed within a bushing fixed to the machine housing. One end of the top pin is corresponding to a drive cam, and the other end is corresponding to the stitch length adjustment component. A reset spring is provided on the top pin to drive it to reset.
[0009] In the aforementioned digital overlock sewing machine, the differential ratio adjustment device includes a main drive rod, a main return spring, a differential slider, a differential ratio adjustment transmission component, and a differential cam. The differential cam is connected to the main drive rod via a one-way bearing assembly, enabling the main drive rod to drive the differential cam to rotate to a specific angle and disengage from the linkage when the main drive rod returns to its original position. The differential cam has curved surfaces with different curvatures, and after rotation, it contacts the differential ratio adjustment transmission component through different curved surfaces to drive the differential slider to change its vertical position.
[0010] In the aforementioned digital overlock sewing machine, the presser foot pressure adjustment device includes a presser foot pressure adjustment transmission component and a pressure adjustment block. The pressure adjustment block is connected to the presser foot pressure adjustment cam via the presser foot pressure adjustment transmission component. The swaying of the presser foot pressure adjustment cam drives the pressure adjustment block to move up and down. The up and down movement of the pressure adjustment block drives the compression spring to change the compression amount to adjust the presser foot pressure.
[0011] In the aforementioned digital overlock sewing machine, the differential ratio adjustment transmission component and the presser foot pressure adjustment transmission component are respectively one or a combination of connecting rod, rocker arm, and roller top rod.
[0012] In the aforementioned digital overlock sewing machine, the fabric sensing device senses and activates the presser foot lifting device, the suction device, and the thread cutting device; wherein, activating the thread cutting device further includes activating the thread cutting device to cut the front thread end of the fabric and activating the thread cutting device to cut the rear thread end of the fabric.
[0013] In the aforementioned digital overlock sewing machine, the sensor receiver is at least located in a first detection area for fabric feeding and a second detection area for fabric bottoming.
[0014] In the aforementioned digital overlock sewing machine, the stepper motor can also replace other rotary drive sources in this field.
[0015] Compared with the prior art, this utility model has the following advantages: This invention provides a digital overlock sewing machine, employing a highly integrated mechatronics design. It utilizes a dual-stepper motor architecture to drive multiple actuators, achieving precise digital control of core functions such as thread trimming, presser foot lifting, tooth height, stitch length, differential ratio, and presser foot pressure. Through the combination of a cam-aligned set and a ratchet-pawl mechanism, a single motor sequentially drives multiple actions in a specific rotation direction and sequence, simplifying the mechanical structure, reducing manufacturing costs, and significantly improving operational reliability and repeatability. The introduction of a presser foot height detection device and a fabric sensing device endows the machine with intelligent sensing and adaptive adjustment capabilities. It can detect the presser foot lifting height and fabric position in real time, automatically adjusting the presser foot pressure and precisely controlling the thread trimming timing to improve the consistency of sewing quality. Therefore, this invention significantly improves the automation level, production efficiency, and sewing quality of overlock sewing machines, meeting the core needs of the modern textile and apparel industry for efficient, precise, and intelligent production. Attached Figure Description
[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the stepper motor and related components of this utility model; Figure 3 This is a perspective view of the stepper motor and related components of this utility model; Figure 4 This is a perspective view of the fabric sensing device of this utility model; Reference numerals: 1. Stepper motor one; 2. Thread trimming device; 3. Presser foot lifting device; 4. Tooth height adjustment device; 5. Stepper motor two; 6. Stitch pitch adjustment device; 7. Differential ratio adjustment device; 8. Presser foot pressure adjustment device; 9. Presser foot height detection device; 10. Sensor block; 11. Sensor; 12. Presser foot lever; 13. Fabric sensing device; 14. Signal transmitter; 15. Sensor receiver; 16. Worktable; 17. Thread trimming cam ; 18. Presser foot lifting cam; 19. Tooth height adjusting cam; 20. Ratchet; 21. Pad; 22. Drive cam; 23. Presser foot pressure adjusting cam; 24. Pitch adjusting assembly; 25. Top pin; 26. Main drive rod; 27. Main return spring; 28. Differential slider; 29. Differential ratio adjusting transmission component; 30. Differential cam; 31. Presser foot pressure adjusting transmission component; 32. Pressure adjusting block; 33. First detection area; 34. Second detection area. Detailed Implementation
[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-4 : A digital overlock sewing machine, comprising: A stepper motor 1 is connected to and drives the wire-cutting device 2, the pressure foot lifting device 3, and the tooth height adjustment device 4. Specifically, the stepper motor 1 has a wire-cutting cam 17 that drives the wire-cutting device 2, a pressure foot lifting cam 18 that drives the pressure foot lifting device 3, and a tooth height adjustment cam 19 that drives the tooth height adjustment device 4, all mounted on the motor shaft of the stepper motor 1. When the stepper motor 1 rotates counterclockwise, it drives the wire-cutting device 2; when it rotates clockwise, it drives the pressure foot lifting device 3 and the tooth height adjustment device 4 in sequence. In this embodiment, the wire-cutting device 2, the pressure foot lifting device 3, and the tooth height adjustment device 4 are all conventional cam-driven devices available in the art. The tooth height adjustment device 4 is the device that realizes the downward arching function of the teeth.
[0018] Furthermore, a rotatable ratchet 20 is mounted on the motor shaft of the stepper motor 1, and a pawl 21 that cooperates with the ratchet 20 is provided on the motor mounting plate. The tooth height adjustment cam 19 drives the ratchet 20 to rotate through the ratchet pin to switch the tooth height adjustment gear. Furthermore, after the tooth height adjustment cam 19 realizes the tooth arching function, it can continue to rotate to drive the ratchet 20 to rotate to realize multi-gear tooth height adjustment.
[0019] In this embodiment, the function driven by stepper motor 1 is: The wire-cutting function is achieved by stepper motor 1 rotating counterclockwise, which drives the wire-cutting device 2 to perform the wire-cutting action via wire-cutting cam 17. The stepper motor 1 rotates clockwise, which drives the stepper lifting device 3 to lift the pressure foot via the stepper lifting cam 18. Tooth arching function: Stepper motor 1 continues to rotate clockwise, driving the tooth arching device to work through tooth height adjustment cam 19; Tooth height adjustment function: After the tooth arching is completed, the stepper motor 1 continues to rotate clockwise. The tooth height adjustment cam 19 drives the ratchet 20 mechanism through the ratchet 20 pin to realize multi-level adjustment of the feed tooth height.
[0020] This embodiment further includes: A second stepper motor 5 is connected to and drives the stitch pitch adjustment device 6, the differential ratio adjustment device 7, and the presser foot pressure adjustment device 8. Specifically, the first shaft end of the second stepper motor 5 is provided with a drive cam 22, and the second shaft end is provided with a presser foot pressure adjustment cam 23. The drive cam 22 drives the stitch pitch adjustment device 6 when rotated clockwise by the second stepper motor 5, and drives the differential ratio adjustment device 7 when rotated counterclockwise. The presser foot pressure adjustment cam 23 drives the presser foot pressure adjustment device 8. In this utility model, the stitch pitch adjustment device 6, the differential ratio adjustment device 7, and the presser foot pressure adjustment device 8 are all conventional cam-driven devices available in the art.
[0021] Furthermore, the stitch length adjustment device 6 includes a top pin 25 for unlocking the stitch length adjustment component 24. The top pin 25 is slidably disposed in a bushing fixed to the machine housing. One end of the top pin 25 is correspondingly disposed to the drive cam 22, and the other end is correspondingly disposed to the stitch length adjustment component 24. A reset spring is provided on the top pin 25 to drive it to reset.
[0022] Furthermore, the differential ratio adjustment device 7 includes a main drive rod 26, a main return spring 27, a differential slider 28, a differential ratio adjustment transmission component 29, and a differential cam 30. The differential cam 30 is connected to the main drive rod 26 through a one-way bearing assembly, so that the main drive rod 26 can drive the differential cam 30 to rotate to a specific angle and disengage from the linkage when the main drive rod 26 is reset. The differential cam 30 has curved surfaces with different curvatures. After rotation, it contacts the differential ratio adjustment transmission component 29 through different curved surfaces to drive the differential slider 28 to change its vertical position.
[0023] Furthermore, the presser foot pressure adjusting device 8 includes a presser foot pressure adjusting transmission component 31 and a pressure adjusting block 32. The pressure adjusting block 32 is connected to the presser foot pressure adjusting cam 23 through the presser foot pressure adjusting transmission component 31. The swaying of the presser foot pressure adjusting cam 23 drives the pressure adjusting block 32 to move up and down. The up and down movement of the pressure adjusting block 32 drives the compression spring to change the compression amount to adjust the presser foot pressure.
[0024] In this embodiment, the function driven by stepper motor 25 is: Stitch pitch adjustment function: Stepper motor 25 rotates clockwise, which drives cam 22 to push top pin 25 forward, thereby unlocking stitch pitch adjustment component 24 (for example, drive cam 22 drives top pin 25 to move towards the main shaft until it abuts against the eccentric seat, the main shaft motor drives the main shaft to rotate the eccentric seat until top pin 25 falls into the clearance groove, and top pin 25 drives slider to move radially and separate its toothed end from the fixed toothed sleeve), thus achieving stitch pitch adjustment in conjunction with the rotation of the main shaft; Differential ratio adjustment function: Stepper motor 25 rotates counterclockwise, which drives the main drive rod 26 to rotate through the drive cam 22, and then drives the differential cam 30 to rotate at a specific angle through the one-way bearing group, thereby changing the position of the differential slider 28 to achieve differential ratio adjustment; Presser foot pressure adjustment function: When the stepper motor 25 rotates, the yaw motion of the presser foot pressure adjustment cam 23 drives the pressure adjustment block 32 to move up and down through the presser foot pressure adjustment transmission component 31, thereby changing the compression amount of the compression spring and realizing stepless adjustment of the presser foot pressure.
[0025] This embodiment further includes: The presser foot height detection device 9 includes a sensing block 10 and a sensor 11. The sensing block 10 is mounted on the presser foot rod 12, and the sensor 11 is mounted on the machine housing. Its working principle is as follows: when the presser foot assembly is lifted by the fabric, the presser foot rod 12 moves the sensing block 10 upward. The sensor 11 detects the position change and transmits the signal to the electronic control system. The system controls the stepper motor 5 to increase or decrease the presser foot pressure accordingly, thereby realizing the automatic adjustment of the presser foot pressure.
[0026] This embodiment further includes: The fabric sensing device 13 includes a sensing and transmitting mechanism comprising a signal transmitter 14 and multiple sensor receivers 15. The sensor receivers 15 are disposed in different areas of the worktable 16. For example, one sensor receiver 15 is disposed in the first detection area 33 of the fabric feed, and another sensor receiver 15 is disposed in the second detection area 34 where the fabric reaches the bottom. Furthermore, the fabric sensing device 13 senses and activates the presser foot lifting device 3, the suction device, and the thread cutting device 2; wherein activating the thread cutting device 2 further includes activating the thread cutting device 2 to cut the front thread end of the fabric and activating the thread cutting device 2 to cut the rear thread end of the fabric. The specific method is as follows: when the fabric enters the first detection area 33, the sensor beam signal is blocked, and the system starts the presser foot lifting device 3 and the suction device; when the fabric reaches the second detection area 34, the system calculates the real-time feed speed of the fabric based on the signal time difference between the two sensing areas, and accurately calculates the timing of thread cutting through a preset algorithm. The front thread end is cut when the front end of the fabric is about to pass the cutter, and the rear thread end is cut after sewing is completed, thereby achieving a stable and precisely controlled automated thread cutting operation.
[0027] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.
Claims
1. A digital overlock sewing machine, characterized in that, include: Stepper motor 1 (1), wherein the stepper motor 1 (1) is connected to the wire cutting device (2), the pressing foot lifting device (3), and the tooth height adjusting device (4) and drives their respective actions; Stepper motor 2 (5) is connected to the needle pitch adjustment device (6), the differential ratio adjustment device (7), and the presser foot pressure adjustment device (8) and drives them to move respectively. The presser foot height detection device (9) includes a sensing block (10) and a sensor (11). The sensing block (10) is disposed on the presser foot pressing rod (12), and the sensor (11) is disposed on the machine housing. The fabric sensing device (13) includes a set of sensing beam mechanisms, including a signal transmitter (14) and multiple sensing receivers (15), which are arranged in different areas of the workbench (16).
2. The digital overlock sewing machine according to claim 1, characterized in that, The stepper motor (1) has a misaligned mounting on its motor shaft with a wire-cutting cam (17) for driving the wire-cutting device (2), a pressure-lifting cam (18) for driving the pressure-lifting device (3), and a tooth height adjusting cam (19) for driving the tooth height adjusting device (4). When the stepper motor (1) rotates counterclockwise, it drives the wire-cutting device (2), and when it rotates clockwise, it drives the pressure-lifting device (3) and the tooth height adjusting device (4) in sequence.
3. A digital overlock sewing machine according to claim 2, characterized in that, The stepper motor (1) has a rotatable ratchet (20) mounted on its motor shaft. The motor mounting plate is provided with a pawl (21) that cooperates with the ratchet (20). The tooth height adjustment cam (19) drives the ratchet (20) to rotate through the ratchet pin to switch the tooth height adjustment gear.
4. A digital overlock sewing machine according to claim 1, characterized in that, The first shaft end of the stepper motor (5) is provided with a drive cam (22), and the second shaft end is provided with a presser foot pressure adjustment cam (23). The drive cam (22) is driven by the stepper motor (5) to drive the needle pitch adjustment device (6) when rotating clockwise and to drive the differential ratio adjustment device (7) when rotating counterclockwise. The presser foot pressure adjustment cam (23) drives the presser foot pressure adjustment device (8).
5. A digital overlock sewing machine according to claim 4, characterized in that, The stitch length adjustment device (6) includes a top pin (25) for unlocking the stitch length adjustment assembly (24). The top pin (25) is slidably disposed in a bushing fixed to the housing. One end of the top pin (25) is correspondingly disposed to the drive cam (22), and the other end is correspondingly disposed to the stitch length adjustment assembly (24). A reset spring is provided on the top pin (25) to drive it to reset.
6. A digital overlock sewing machine according to claim 4, characterized in that, The differential ratio adjustment device (7) includes a main drive rod (26), a main return spring (27), a differential slider (28), a differential ratio adjustment transmission component (29), and a differential cam (30). The differential cam (30) is connected to the main drive rod (26) through a one-way bearing assembly, so that the main drive rod (26) can drive the differential cam (30) to rotate to a specific angle and disengage from the linkage when the main drive rod (26) is reset. The differential cam (30) has curved surfaces with different curvatures. After it rotates, it contacts the differential ratio adjustment transmission component (29) through different curved surfaces to drive the differential slider (28) to change its up and down position.
7. A digital overlock sewing machine according to claim 4, characterized in that, The presser foot pressure regulating device (8) includes a presser foot pressure regulating transmission component (31) and a pressure regulating block (32). The pressure regulating block (32) is connected to the presser foot pressure regulating cam (23) through the presser foot pressure regulating transmission component (31). The swaying of the presser foot pressure regulating cam (23) drives the pressure regulating block (32) to move up and down. The up and down movement of the pressure regulating block (32) drives the compression spring to change the compression amount to regulate the presser foot pressure.
8. A digital overlock sewing machine according to claim 1, characterized in that, The fabric sensing device (13) senses and activates the presser foot device (3), the suction device, and the thread cutting device (2).
9. A digital overlock sewing machine according to claim 8, characterized in that, The sensor receiver (15) is at least located in the first detection area (33) of the fabric feeding and the second detection area (34) of the fabric bottom.