Sewing machine

Abstract

The utility model relates to a sewing machine which comprises a rotating shuttle body, a shuttle peg and a detection device. The rotating shuttle body is arranged on the machine body and internally provided with a containing cavity. The shuttle peg is rotatably arranged in the containing cavity in the axial direction of the shuttle peg, the shuttle peg comprises a first panel, a second panel and a shuttle peg shaft, a side face hole is formed in the first panel, and the reflection coefficient of the second panel is larger than that of the first panel; detection signals of the detection device correspond to the side face holes, the detection device collects the detection signals reflected by the first panel or the second panel and generates reflection signals when the shuttle peg rotates, and the rotating speed of the shuttle peg is calculated through the reflection signals. According to the invention, the surface with a high reflection coefficient is arranged on the second panel and is compared with the side surface hole in the first panel, so that the laser sensor can recognize a hole signal more accurately, and the negative influence of high reflectivity of a material on the recognition capability of the sensor is overcome; the technical problem that in the prior art, when a shuttle peg rotates, high reflectivity of the material of the shuttle peg affects the rotating speed detection accuracy is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field especially relates to a sewing machine. BACKGROUND

[0002] At present, in the automation and intelligentization process of sewing machine, the accurate determination of bobbin speed is crucial for ensuring sewing quality and improving production efficiency. As one of the core components of sewing machine, the speed of bobbin is directly related to the supply speed of bottom line, and further affects the stitching effect. Therefore, photoelectric detection technology, especially the application of laser sensor, has been widely introduced into the monitoring of bobbin speed. This non-contact measurement method not only reduces mechanical wear and tear, but also significantly improves the sensitivity and accuracy of detection. Through the scanning of laser beam on the surface of bobbin, the dynamic changes of bobbin can be captured in real time, so as to obtain its speed information.

[0003] However, although laser sensor shows significant advantages in bobbin speed detection, there is still a technical problem that cannot be ignored in the prior art, that is, the influence of high reflectivity of bobbin material on the determination result. Bobbin is usually made of high reflective materials such as metal or plastic, which will produce strong reflection signal under laser irradiation. In ideal state, laser sensor judges the rotation state of bobbin by detecting whether there is a hole on the side surface, but in actual operation, the reflected light on the surface of bobbin may interfere with the recognition of sensor to the hole signal, especially when the bobbin rotates at high speed, the stroboscopic effect of reflected light will cause the sensor to misjudge, which will affect the accurate determination of speed. In addition, the change of reflected light intensity on the surface of bobbin during rotation may also cause signal fluctuation, further reducing the stability of detection. Therefore, how to overcome the influence of reflectivity of bobbin material on speed detection has become a technical problem to be solved at present, which is of great significance to improve the automation control level of sewing machine. SUMMARY

[0004] The main purpose of the utility model is to provide a sewing machine to solve the technical problem that the high reflectivity of bobbin material during rotation affects the accuracy of speed detection in the prior art.

[0005] In order to achieve the above object, according to one aspect of the present application, a sewing machine is provided, comprising: a rotating hook body, the rotating hook body is arranged on a machine body of the sewing machine, and a containing cavity is formed in the rotating hook body; a bobbin, the bobbin is rotatably arranged in the containing cavity along an axial direction, the bobbin comprises a first panel, a second panel and a bobbin shaft, the first panel and the second panel are arranged at two ends of the bobbin shaft, a side hole is arranged on the first panel, and a reflection coefficient of a surface of the second panel corresponding to the side hole is greater than a reflection coefficient of the first panel; and a detection device, the detection device is arranged corresponding to the side hole to enable the detection device to collect a detection signal reflected by the first panel or the second panel and generate a reflected signal when the bobbin rotates, so that a rotating speed of the bobbin is calculated through the reflected signal.

[0006] Further, a reflecting element is arranged on the second panel and arranged corresponding to the side hole to enable the reflecting element to reflect the detection signal and generate the reflected signal when the detection signal is aligned with the side hole.

[0007] Further, a plurality of side holes are arranged on the first panel and arranged at intervals along a circumferential direction of the bobbin shaft, and a plurality of reflecting elements are arranged on an inner side of the second panel corresponding to the plurality of side holes.

[0008] Further, a light-reflecting coating is arranged on a side of the second panel close to the first panel, and / or the second panel is made of a light-reflecting material.

[0009] Further, the rotating hook body comprises a hook shell and a bobbin sleeve, the hook shell is arranged on the machine body, the hook shell and the bobbin sleeve form the containing cavity, a fixing shaft is arranged on the hook shell, the bobbin shaft is sleeved on the fixing shaft, a clamping part is arranged on the hook shell, and a clamping element is arranged on the bobbin sleeve corresponding to the clamping part.

[0010] Further, a first through hole is arranged on the bobbin sleeve, the first panel is arranged on a side of the bobbin shaft close to the first through hole, and the detection device is arranged in the first through hole.

[0011] Further, a second through hole is arranged on the hook shell, the first panel is arranged on a side of the bobbin shaft close to the second through hole, and the detection device is arranged on the machine body corresponding to the second through hole.

[0012] Further, the detection device comprises a signal emitting end and a signal receiving end, an emitting axis of the signal emitting end is aligned with a center of the side hole on the bobbin shaft, and the signal receiving end is arranged opposite to the signal emitting end to receive the detection signal reflected by the first panel or the reflecting element, so that the rotating speed of the bobbin is calculated through a receiving frequency of the signal.

[0013] Further, the detection device is a reflective laser sensor, the detection device comprises a detection head and a sensor body, the detection head is used to generate a laser beam, an axis of the laser beam is aligned with the side hole on the bobbin shaft, and the sensor body receives the laser signal reflected by the side hole or the reflecting element.

[0014] Further, the sewing machine further comprises a control module, which is in signal connection with the detection device and calculates the rotation speed of the bobbin according to the receiving frequency of the reflected signal.

[0015] The technical scheme of the utility model is applied to the above embodiment, the bobbin body serves as a fixed and supporting structure, providing a stable environment for the free rotation of the bobbin. The bobbin is placed in the accommodating cavity inside the bobbin body, and the rotation axis is aligned with the structure of the bobbin body, ensuring that the detection signal can accurately align with the side hole of the bobbin. The stability of the bobbin rotation during the detection process and the accurate alignment of the detection signal are ensured. The contrast between the side hole on the first panel and the high-reflection surface of the second panel is the key innovation point of the utility model. When the detection signal emitted by the detection device aligns with the side hole, the second panel corresponding to the side hole has a high reflection coefficient, and can produce a reflected signal that is obviously different from the first panel. This differentiated reflected signal helps the detection device more clearly identify the rotation state of the bobbin, and even at high speed, it can effectively distinguish the hole signal from the bobbin surface reflected signal, improving the detection accuracy. The detection device can monitor the reflection changes in the bobbin rotation process in real time by emitting detection signals and receiving reflected signals. Due to the reflection characteristics of the second panel, the detection device can more accurately identify the passage of the side hole of the bobbin, and further calculate the rotation speed of the bobbin by the time between the two detection signals. The present application sets a high-reflection-coefficient surface on the second panel, which contrasts with the side hole on the first panel, so that the laser sensor can more accurately identify the hole signal, overcoming the negative impact of the high reflectivity of the material on the sensor's identification ability, and solving the technical problem of the high reflectivity of the material affecting the accuracy of the rotation speed detection when the bobbin rotates in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the utility model, form a part of the present application, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute undue limitations on the utility model. In the drawings:

[0017] Figure 1 A perspective view of a bobbin body and a detection device according to one embodiment of the sewing machine of the utility model is shown;

[0018] Figure 2 A perspective view of a bobbin according to one embodiment of the sewing machine of the utility model is shown;

[0019] Figure 3 A perspective view of a bobbin shell according to one embodiment of the sewing machine of the utility model is shown;

[0020] Figure 4 A perspective view of a bobbin sleeve according to one embodiment of the sewing machine of the utility model is shown.

[0021] Wherein, the above figures include the following reference signs:

[0022] 1, rotating shuttle body; 11, shuttle shell; 111, fixed shaft; 112, clamping part; 113, second through hole; 12, bobbin sleeve; 121, clamping piece; 122, first through hole; 2, bobbin; 21, first panel; 211, side hole; 22, second panel; 23, bobbin shaft; 3, reversing member; 4, detection device; 41, detection head; 42, sensor body; 5, reversing member. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0025] In the present application, unless otherwise stated, the orientation words such as "up, down, top, bottom" are generally directed to the direction shown in the drawings, or are directed to the vertical, perpendicular or gravity direction of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0026] As shown in Figures 1 to 4 The embodiment of the present application provides a sewing machine, which comprises: a rotating shuttle body 1, the rotating shuttle body 1 is arranged on the body of the sewing machine, and a containing cavity is formed in the rotating shuttle body 1; a bobbin 2, the bobbin 2 is rotatably arranged in the containing cavity in the axial direction, the bobbin 2 comprises a first panel 21, a second panel 22 and a bobbin shaft 23, the first panel 21 and the second panel 22 are arranged at two ends of the bobbin shaft 23, the first panel 21 is provided with a side hole 211, the reflection coefficient of the surface of the second panel 22 corresponding to the side hole 211 is greater than that of the first panel; a detection device 4, the detection signal of the detection device 4 is arranged corresponding to the side hole 211, so that when the bobbin 2 rotates, the detection device 4 collects the detection signal reflected by the first panel 21 or the second panel 22 and generates a reflection signal, thereby calculating the rotating speed of the bobbin 2 through the reflection signal.

[0027] The sewing machine provided by the embodiment of the utility model, through setting the high-reflection-coefficient surface on the second panel 22, compared with the side hole 211 on the first panel 21, makes the detection device 4 more accurately identify the hole signal, overcomes the negative influence of the high-reflection property of the material on the sensor identification ability, solves the technical problem that the high-reflection property of the material of the bobbin 2 when rotating affects the accuracy of the rotational speed detection in the prior art.

[0028] In the above embodiment, the rotating hook body 1 serves as a fixed and supporting structure, providing a stable environment for the free rotation of the bobbin 2. The bobbin 2 is placed in the accommodating cavity inside the rotating hook body 1, with its rotation axis aligned with the structure of the rotating hook body 1, ensuring that the detection signal can be accurately aligned with the side hole 211 of the bobbin 2. This guarantees the stability of the bobbin 2 rotation during the detection process and the accurate alignment of the detection signal. The contrast between the side hole 211 on the first panel 21 and the high-reflection surface of the second panel 22 is the key innovation point of the utility model. When the detection signal emitted by the detection device 4 is aligned with the side hole 211, due to the high reflection coefficient of the second panel 22 corresponding to the side hole 211, a reflection signal that is significantly different from the first panel 21 can be generated. This differentiated reflection signal helps the detection device 4 more clearly identify the rotation state of the bobbin 2, effectively distinguishing the hole signal from the surface reflection signal of the bobbin 2 even at high speed, improving the detection accuracy. The detection device 4 can monitor the reflection changes in real time during the rotation of the bobbin 2 by emitting detection signals and receiving reflection signals. Due to the reflection characteristics of the second panel 22, the detection device 4 can more accurately identify the passage of the side hole 211 of the bobbin 2, and further calculate the rotational speed of the bobbin 2.

[0029] Specifically, as shown in Figure 2 The second panel 22 is provided with a reflection member 5 corresponding to the side hole 211, so that when the detection signal is aligned with the side hole 211, the reflection member 5 reflects the detection signal and generates a reflection signal. The reflection member is specially set on the second panel, and this design is to enhance the signal feedback of the laser sensor when detecting the hole. The position of the reflection member corresponds to the side hole on the first panel of the bobbin, and when the laser detection signal is accurately aligned with the side hole, the reflection member can efficiently reflect this signal and generate a clear reflection signal. This arrangement ensures that the laser sensor can receive a strong reflection feedback when the hole passes, thereby more accurately identifying the presence of the hole, even under the condition of high-speed rotation of the bobbin, effectively avoiding misjudgment of the signal.

[0030] In this embodiment, the first panel 21 has six side holes 211 evenly arranged around the bobbin circumferentially. The second panel 22, near the first panel 21, has six reflectors corresponding to the six side holes 211. Since the bobbin has six openings on its side, these six side holes determine that the bobbin has rotated one revolution when the retroreflective laser sensor detects six retroreflective signals. This ingenious structural design not only ensures the stability and continuity of sewing, avoiding sewing interruptions due to thread exhaustion, but also provides operators with more convenient and intuitive feedback on thread output rate. Through the designed threshold setting and the recognition of reflective signals, the sewing machine's operating status can be accurately determined, and an alarm can be triggered at critical moments, thereby ensuring the efficiency and stability of the sewing process.

[0031] In the above embodiment, a threshold is set for the detection device 4. The threshold setting needs to be greater than the material reflectivity threshold of the bobbin 2, the bobbin thread, and the rotary hook. When the detected reflectivity signal value is less than the set threshold, it indicates that the material of the bobbin 2 or the bobbin thread is detected, rather than other reflective light sources, and no counting is performed. When the detected reflectivity signal value is greater than the set threshold, it means that other reflective light sources are detected, and counting is performed.

[0032] In the above embodiments, the reflective elements can be selected from the following types:

[0033] Aluminum foil: High reflectivity; can be attached to the inside of the second panel 22; relatively low cost; easy to process and install. Stainless steel: Smooth surface; good reflectivity; high durability and corrosion resistance; suitable for environments requiring long-term stable operation. Silver-plated or aluminum-plated metal sheets: The coating provides extremely high reflectivity, suitable for applications requiring high-precision reflected signals.

[0034] Plastic reflective materials:

[0035] Polyester film (PET): PET film coated with a high-reflectivity layer, offering excellent optical properties while being lightweight and easy to install, making it suitable for applications requiring weight reduction. Acrylic reflectors: Transparent or translucent acrylic material with a reflective coating, providing clear reflected signals while offering good weather resistance and impact resistance. Reflective paint or coating:

[0036] Reflective paint: Can be directly sprayed onto the inside of the second panel 22 to form a reflective coating. It is simple to apply, low in cost, and suitable for panels of various materials. Reflective adhesive: Similar to reflective stickers, it can be easily applied to the panel, providing high reflectivity and good stability, while also facilitating replacement and maintenance. Optical lenses:

[0037] Plane mirror: Provides complete reflection, suitable for high-precision signal reflection applications. However, it may require high installation precision. Concave or convex mirror: Changes the path of reflected light, optimizing laser signal reception, suitable for adjusting the angle of reflected light. Composite materials:

[0038] Reflective paper: Low-cost reflective layer on paper surface, suitable for rapid prototyping or temporary solutions. Reflective film: Contains tiny reflective particles, can be attached to the panel to provide uniform high reflection, suitable for large-area reflection applications.

[0039] Specifically, the first panel 21 is provided with a plurality of side holes 211, and the plurality of side holes 211 are circumferentially spaced apart along the bobbin shaft 23. The second panel 22 is provided with a plurality of reflecting elements 5 corresponding to the plurality of side holes 211. The first panel is provided with a plurality of side holes, which are uniformly distributed along the circumferential direction of the bobbin shaft. The side holes are set to enable the laser sensor to capture the dynamic changes of the bobbin rotation in real time. The presence or absence of the holes provides the basis for the detection signal. The uniform distribution of the side holes ensures that the laser sensor can receive the hole signal at a consistent frequency during the rotation of the bobbin, thereby obtaining more accurate speed information. The second panel is provided with a plurality of reflecting elements corresponding to the side holes of the first panel, and the reflecting elements are accurately positioned corresponding to the side holes. The purpose of this design is to use the high reflectivity of the reflecting elements to enhance the signal strength received by the laser sensor, especially the signal feedback when the side hole passes. The reflecting elements can reflect the laser beam back to the laser sensor when the side hole appears, generating a strong reflection signal, thereby helping the laser sensor to more accurately identify the moment of hole passing, even at high speed of the bobbin rotation, and maintaining the clarity of the detection signal.

[0040] Specifically, the second panel 22 is provided with a reflective coating on the side close to the first panel 21, and / or the second panel 22 is made of a reflective material. The reflective coating or reflective material makes the reflection coefficient of the second panel 22 different from that of the first panel 21. The second panel made of reflective coating or reflective material can produce a more intense reflection signal than other parts of the core under laser irradiation. When the laser sensor is aligned with the side hole, the significant signal difference between the high reflection area of the second panel and the non-hole area can be detected, which helps the laser sensor to more clearly and accurately identify the passage of the hole, thereby improving the sensitivity and accuracy of the rotation speed detection. Under the condition of high-speed rotation of the core, the high reflectivity of the reflective coating or reflective material can ensure the intensity and stability of the reflection signal. Even under the stroboscopic effect generated at high speed, the laser sensor can stably receive the hole signal and high reflection signal, avoiding signal misjudgment and enhancing the reliability of detection. By using the reflective properties of the second panel, the complexity and cost of the detection device can be simplified. Since the function of the reflector can be directly integrated into the second panel through the reflective coating or reflective material, there is no need for additional reflector hardware, which not only reduces the number of parts of the detection device, but also reduces the difficulty and cost of system assembly, while ensuring detection performance.

[0041] In the above embodiments, since the core is generally made of aluminum alloy, in order to obtain a higher reflection coefficient than aluminum alloy, a silver plating layer, a gold plating layer, a rhodium plating layer, a metal ceramic coating, a photonic crystal coating, a multilayer dielectric film coating, or a laser reflection enhancement coating can be preferred. Among them, silver plating layer is the first choice due to its extremely high reflectivity, while metal ceramic coating and laser reflection enhancement coating provide a good balance between cost and performance. In actual selection, the most suitable reflective coating material should be determined according to the specific application requirements, cost budget and environmental conditions.

[0042] Specifically, the rotary hook body 1 includes a bobbin case 11 and a bobbin sleeve 12. The bobbin case 11 is mounted on the machine body, and the bobbin case 11 and the bobbin sleeve 12 enclose a receiving cavity. A fixed shaft 111 is provided on the bobbin case 11, and a bobbin shaft 23 is sleeved on the fixed shaft 111. A snap-fit ​​part 112 is provided on the bobbin case 11, and a snap-fit ​​element 121 is provided on the bobbin sleeve 12 corresponding to the snap-fit ​​part. The bobbin case 11 and the bobbin sleeve 12 cooperate to form a closed receiving cavity, providing installation space and protection for the bobbin. The bobbin case 11 is fixed to the machine body, while the bobbin sleeve 12 is in direct contact with the bobbin. Through their synergistic effect, the stability and safety of the bobbin during high-speed rotation are ensured. The bobbin case 11 provides external structural support, while the bobbin sleeve 12 directly cooperates with the bobbin, guiding the rotation of the bobbin. Through its cooperation with the bobbin case 11, a closed environment is formed to prevent interference from the thread and external impurities. The fixed shaft 111 is located on the bobbin case 11, and the bobbin shaft 23 is sleeved on the fixed shaft 111. The function of the bobbin shaft 23 is to support the bobbin and transmit rotational power, while the fixed shaft 111 provides the rotation center for the bobbin shaft 23. Together, they ensure the smooth and accurate rotation of the bobbin. The snap-fit ​​part 112 on the bobbin case 11 cooperates with the snap-fit ​​element 121 on the bobbin sleeve 12 to fix and position the bobbin sleeve 12 on the bobbin case 11. The interaction between the snap-fit ​​part and the snap-fit ​​element allows the bobbin sleeve 12 to be firmly installed on the bobbin case 11, while facilitating disassembly and maintenance.

[0043] Specifically, such as Figure 3 As shown, the bobbin sleeve 12 has a first through hole 122, and the first panel 21 is located on the side of the bobbin shaft 23 near the first through hole 122. The detection device 4 passes through the first through hole 122. The first through hole 122 on the bobbin sleeve 12 provides a path for the detection device 4 to pass through, allowing the detection device to directly or indirectly approach the bobbin for accurate detection. The bobbin sleeve 12 provides a path for the detection device to pass through, the precise positioning of the first through hole 122 allows the detection device to accurately align with the detection target, and the features on the first panel 21 provide the necessary information carrier for detection. Through these cooperative relationships, the detection device 4 achieves accurate detection of the bobbin's rotation state.

[0044] In the above embodiments, the following methods can be selected for installing the detection device 4 in the first through hole 122:

[0045] Guide tube installation method: Inside the shuttle case or shuttle core sleeve, near the first through hole 122, a guide tube can be pre-installed. The diameter of this guide tube is slightly larger than the outer diameter of the detection device to ensure that the detection device can be smoothly inserted. The use of the guide tube not only helps the detection device to be accurately positioned, but also protects the detection device from mechanical stress, extending its service life.

[0046] Fixed bracket method: A fixed bracket can be designed to secure the detection device on the bracket. This bracket needs to be accurately installed on the shuttle shell to ensure that its relative position with the first through-hole 122 remains unchanged. The fixed bracket can be bolted, buckled or glued, depending on the size of the detection device and the manufacturing material of the shuttle shell. The design of the bracket should take into account the emission angle and receiving angle of the detection device to ensure the best path of signal transmission.

[0047] Adjustable installation method: To accommodate different sizes of the shuttle core or different types of detection devices, an adjustable installation system can be designed. This system usually includes a base fixed on the shuttle shell and an adjustable positioning arm that can be adjusted in multiple directions to accurately align the first through-hole 122. This installation method needs to ensure the adjustment accuracy of the positioning arm and the stability of the detection device to avoid affecting the detection effect due to improper adjustment.

[0048] Integrated design method: When designing the shuttle body 1, the installation position and method of the detection device 4 can be considered in advance, so that the first through-hole 122 and the interface of the detection device form an integrated design. This design method can more effectively ensure the positioning of the detection device, reduce external interference, and simplify the installation and maintenance process.

[0049] Spring-loaded method: By installing springs on both ends or one side of the detection device, it can maintain a certain pressure in the first through-hole 122, thereby ensuring the close contact between the detection device and the shuttle core sleeve or the shuttle shell, improving the stability and reliability of the detection.

[0050] Specifically, as shown in Figure 4 The second through-hole is provided on the shuttle shell, the first panel 21 is arranged on the side of the shuttle core shaft 23 close to the second through-hole 113, and the detection device 4 is arranged on the machine body corresponding to the second through-hole. The installation position and observation angle of the detection device 4 are accurately designed according to the positional relationship between the second through-hole 113 and the second panel 22. The detection device 4 observes the feature on the second panel 22 through the second through-hole 113, such as the position change of the hole, to realize the detection of the rotation state of the shuttle core shaft 23. When the shuttle core rotates, the detection signal line of the detection device 4 passes through the second through-hole 113 and then passes through the side hole 211 on the first panel 21 to irradiate on the second panel.

[0051] Specifically, the detection device 4 includes a signal transmitting end and a signal receiving end, the transmitting axis of the signal transmitting end is aligned with the center of the side hole 211 on the shuttle shaft 23, and the signal receiving end is arranged opposite to the signal receiving end to receive the detection signal reflected by the first panel 21 or the reflection member 5, so as to calculate the rotating speed of the shuttle 2 through the receiving frequency of the signal. The signal transmitting end of the detection device 4 is designed with a transmitting axis, which is aligned with the center of the side hole 211 on the shuttle shaft 23, which means that when the laser sensor emits laser, the laser beam will directly pass through the side hole 211, synchronized with the rotating period of the shuttle shaft 23. The signal transmitting end of the detection device 4 is designed with a transmitting axis, which is aligned with the center of the side hole 211 on the shuttle shaft 23, which means that when the laser sensor emits laser, the laser beam will directly pass through the side hole 211, synchronized with the rotating period of the shuttle shaft 23. Effect: This precise alignment ensures that the laser signal can accurately and accurately pass through the side hole 211, when the shuttle shaft 23 rotates, the side hole 211 will periodically block and expose the laser signal, so as to form a pulse signal at the signal receiving end. After receiving the reflected signal, the signal receiving end of the detection device 4 will calculate the rotating speed of the shuttle 2 according to the receiving frequency of the signal, which is realized by the internal processor or controller. The first panel 21 or the reflection member 5 is located in the rotating path of the shuttle shaft 23, when the laser signal passes through the side hole 211, it will irradiate on these components and be reflected back to the signal receiving end of the detection device 4. The first panel 21 or the reflection member 5 is located in the rotating path of the shuttle shaft 23, when the laser signal passes through the side hole 211, it will irradiate on these components and be reflected back to the signal receiving end of the detection device 4.

[0052] Specifically, the detection device 4 is a reflective laser sensor, which includes a detection head 41 for generating a laser beam whose axis is aligned with the side hole 211 on the bobbin shaft 23, and a sensor body 42 that receives the reflected laser signal from the side hole 211 or the reflector 5. The detection device 4 is composed of the detection head 41 and the sensor body 42, and this separated design allows the detection head to be installed in a narrow or hard-to-reach location, such as inside the bobbin case, while the sensor body can be installed at any suitable location on the machine body, connected through a signal line, increasing the flexibility and adaptability of the system layout. This design improves the application range of the detection device without changing the machine body structure. By precisely aligning the laser beam generated by the detection head 41 with the central axis of the side hole 211, the sensor body can accurately capture the reflected signal each time the hole passes, and this precise alignment is the key to achieving high-precision detection. The high resolution and fast response characteristics of the laser sensor ensure that even at high speeds of the bobbin shaft 23, the position change of the side hole 211 can be accurately detected, and thus the rotational speed can be calculated. The reflective laser sensor can achieve non-contact measurement, avoiding direct contact with the bobbin shaft 23 or the rotating bobbin, thereby eliminating mechanical wear and contact errors, ensuring long-term stability and accuracy of detection.

[0053] Specifically, the sewing machine further includes a control module that is signal-connected with the detection device 4 and calculates the rotational speed of the bobbin 2 according to the receiving frequency of the reflected signal. The control module establishes a signal connection with the detection device 4 through wired or wireless means, ensuring that it can receive the reflected signal emitted by the detection device 4 in real time. Effect: This signal connection allows the control module to directly obtain the original data of the rotating state of the bobbin shaft 23 of the sewing machine, and further process these data to calculate the rotational speed of the bobbin 2. The control module receives the reflected signal transmitted by the detection device 4 and calculates the real-time rotational speed of the bobbin 2 according to the change in signal receiving frequency. Effect: The side hole 211 on the bobbin shaft 23 will periodically block and expose the laser signal when rotating, and the control module can calculate the rotational speed of the bobbin shaft 23 by monitoring the number of reflected signals received per unit time, and thus obtain the real-time rotational speed of the bobbin 2. This calculation method relies on the continuity of the laser signal and the stability of the reflected signal, ensuring the real-time and accuracy of the rotational speed detection.

[0054] In the above embodiments, the control module can also be integrated with other systems (such as display module, alarm system, main control system of sewing machine, etc.) to provide more comprehensive operation status monitoring and management. Effect: By calculating the rotational speed of the bobbin 2, the control module can feedback the thread output speed of the bobbin in real time, helping the operator to monitor the running status of the sewing machine. In addition, the control module can also adjust the running parameters of the sewing machine according to the rotational speed information, or trigger an alarm when the bobbin thread is insufficient, so as to avoid the problem of machine stop or sewing quality caused by the depletion of the bobbin thread. The detection device 4 transmits the detection information to the controller of the control module to generate the information required for speed measurement. The controller uses data fitting method, and respectively fits by means of polynomial method, least square method, Lagrange interpolation, Newton interpolation, and finally detects the real-time speed.

[0055] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0056] High-precision rotational speed detection:

[0057] The detection device 4 cooperates with the first panel 21 and the second panel 22 of the bobbin 2, and through the different reflection coefficients of the side holes 211 and the reflecting elements 5, as well as the accurate alignment of the signal transmitting end and the receiving end, the signal change during the rotation of the bobbin 2 can be accurately captured. This design ensures high signal-to-noise ratio of the detection signal, improves the accuracy and stability of the rotational speed detection.

[0058] Non-contact monitoring:

[0059] The detection device 4 adopts a reflective laser sensor, which does not need to be in direct contact with any part of the bobbin 2, avoiding mechanical friction and wear, prolonging the service life of the detection device, and reducing detection errors caused by contact, improving the reliability of detection.

[0060] Automatic and intelligent control:

[0061] The control module is signal-connected with the detection device 4, which can analyze the receiving frequency of the reflected signal in real time and calculate the rotational speed of the bobbin 2. This automatic rotational speed monitoring and calculation provides a basis for intelligent control of the sewing machine, and the control module can adjust the running parameters of the sewing machine, such as thread speed and tension, according to the real-time rotational speed of the bobbin, so as to realize more precise sewing control and improve sewing quality and efficiency.

[0062] Multiple-point detection enhances stability:

[0063] The multiple side holes 211 provided on the first panel 21 and the multiple reflecting elements 5 provided inside the second panel 22 provide multiple detection points. Even if individual detection points fail due to wire coverage or contamination, other detection points can still work normally, ensuring the continuity of the signal and the stability of the system.

[0064] Material and process optimization:

[0065] The use of reflective coatings or reflective materials on the second panel 22 surface further enhances the intensity and clarity of the reflected signal, ensuring that the detection device 4 accurately receives the reflected signal even in darker or dusty work environments, enhancing the environmental adaptability of the detection.

[0066] Simplified structure design and cost reduction:

[0067] The accommodating cavity formed by the bobbin shell 11 and the bobbin core sleeve 12 of the bobbin body 1, and the rotating design of the bobbin core 2 therein, not only ensures the normal function of the sewing machine, but also simplifies the installation and adjustment process of the detection device 4, reduces the production cost and maintenance cost.

[0068] Real-time monitoring and abnormal alarm:

[0069] The control module can monitor the speed change of the bobbin core 2 in real time, and can immediately trigger an alarm when the bobbin thread amount is close to exhaustion, reminding the operator to replace the bobbin, avoiding the interruption of sewing and product quality problems caused by the exhaustion of the bobbin thread.

[0070] Improved operation experience:

[0071] Through intelligent analysis and adjustment of the control module, the sewing machine can automatically optimize the sewing process according to the real-time speed of the bobbin core, reducing the monitoring burden of the operator, improving the use experience, and also reducing the rate of defective products and improving the production efficiency.

[0072] In summary, the sewing machine scheme provided by the present application realizes high-precision, strong stability, and good environmental adaptability of the bobbin core speed detection by setting the area with different reflective characteristics on the first panel and the second panel of the bobbin core, and combining the signal emission and reception of the reflective laser sensor. This innovative design not only simplifies the structure of the sewing machine and reduces the cost, but also improves the sewing quality and efficiency, enhances the automation and intelligence level of the sewing machine, and provides users with a more efficient, convenient and intelligent operation experience.

[0073] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of the features, steps, operations, devices, components and / or combinations thereof.

[0074] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and in the above-described drawings are used only for distinguishing between similar objects and do not necessarily have to describe a specific sequential or chronological order. It is to be understood that the data so distinguished can be interchanged, under appropriate circumstances, such that the embodiments of the present application described herein can be practiced in other than the illustrated or described order.

[0075] The preferred embodiments of the present application have been described above with the specific details. Obviously, the present application can be carried out without the specific details. It is to be understood that the above-described embodiments are only used to illustrate the present application, and the present application can be modified and changed in various ways. 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 sewing machine characterized by comprising: The application relates to a rotating hook body (1) arranged on a sewing machine body, wherein the rotating hook body (1) is internally provided with a containing cavity; a bobbin (2) is arranged in the containing cavity and can rotate around an axis, the bobbin (2) comprises a first panel (21), a second panel (22) and a bobbin shaft (23), the first panel (21) and the second panel (22) are arranged at two ends of the bobbin shaft (23), the first panel (21) is provided with a side hole (211), the reflection coefficient of the surface of the second panel (22) corresponding to the side hole (211) is greater than that of the first panel; a detection device (4) is arranged corresponding to the side hole (211), so that when the bobbin (2) rotates, the detection device (4) collects the detection signal reflected by the first panel (21) or the second panel (22) and generates a reflection signal, and the rotation speed of the bobbin (2) is calculated according to the reflection signal. The second panel (22) is provided with a reflecting element (5) arranged corresponding to the side hole (211), so that when the detection signal is aligned with the side hole (211), the reflecting element (5) reflects the detection signal and generates the reflection signal. The first panel (21) is provided with a plurality of side holes (211) arranged in a circumferential direction and spaced apart along the bobbin shaft (23), and the second panel (22) is provided with a plurality of reflecting elements (5) arranged corresponding to the plurality of side holes (211) on the inner side. The second panel (22) is provided with a light-reflecting coating on the side close to the first panel (21), and / or the second panel (22) is made of light-reflecting material.

2. The sewing machine according to claim 1, characterized in that, The rotating hook body (1) comprises a hook shell (11) and a bobbin sleeve (12), the hook shell (11) is arranged on the machine body, the hook shell (11) and the bobbin sleeve (12) form the containing cavity, the hook shell (11) is provided with a fixed shaft (111), the bobbin shaft (23) is sleeved on the fixed shaft (111), the hook shell (11) is provided with a clamping portion (112), and the bobbin sleeve (12) is provided with a clamping element (121) corresponding to the clamping portion (112).

3. The sewing machine of claim 1, wherein, The bobbin sleeve (12) is provided with a first through hole (122), the first panel (21) is arranged on the side of the bobbin shaft (23) close to the first through hole (122), and the detection device (4) is arranged in the first through hole (122).

4. The sewing machine of claim 1, wherein, The hook shell (11) is provided with a second through hole (113), the first panel (21) is arranged on the side of the bobbin shaft (23) close to the second through hole (113), and the detection device (4) is arranged on the machine body corresponding to the second through hole.

5. The sewing machine of claim 1, wherein, ​ 6. The sewing machine of claim 5, wherein, ​ 7. The sewing machine of claim 5, wherein, ​ 8. The sewing machine of claim 1, wherein, The detection device (4) comprises a signal transmitting end and a signal receiving end, the transmitting axis of the signal transmitting end is aligned with the center of the side hole (211) of the bobbin shaft (23), and the signal receiving end is arranged opposite to the signal receiving end to receive the detection signal reflected by the first panel (21) or the second panel (22), so as to calculate the rotating speed of the bobbin (2) through the receiving frequency of the signal.

9. The sewing machine of claim 8, wherein, The detection device (4) is a reflective laser sensor, and the detection device (4) comprises a detection head (41) and a sensor body (42), the detection head (41) is used for generating a laser beam, the axis of the laser beam is aligned with the side hole (211) on the bobbin shaft (23), and the sensor body receives the laser signal reflected by the side hole (211) or the second panel (22).

10. The sewing machine of claim 1, wherein, The sewing machine further comprises a control module, the control module is signal-connected with the detection device (4), and the rotating speed of the bobbin (2) is calculated according to the receiving frequency of the reflected signal.

Images