Pivotable needle threader

Abstract

This invention provides a bobbin thread quantity detection device and method, and a sewing machine. The bobbin thread quantity detection device includes two magnetic components, a guide wire, and a detection system. The two magnetic components are respectively mounted on the bobbin case and are arranged opposite to each other along the circumferential direction of the bobbin case. The guide wire is mounted on the bobbin, and the bobbin has two contact portions. The two ends of the guide wire are respectively positioned corresponding to the two contact portions. At least a portion of the guide wire is mounted on the bobbin's rotating shaft, and a bobbin thread is wound on the rotating shaft to provide pressure for the two ends of the guide wire to move towards the two contact portions. The detection system is connected to the guide wire to detect the induced current on the guide wire. During bobbin rotation, the presence or absence of an induced current on the guide wire is used to determine whether there is sufficient bobbin thread. This invention solves the problem of low accuracy in detecting the bobbin thread quantity in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and more specifically, to a bobbin thread quantity detection device and method, and a sewing machine. Background Technology

[0002] Currently, sewing machines, as essential tools in sewn product processing, have played a significant role in promoting the development of industries such as garment processing, garment cutting, and leather goods processing due to their stability and versatility. During the normal operation of a sewing machine, monitoring the amount of thread insert is crucial to ensuring its proper functioning. With rapid societal progress and continuous improvement in production efficiency, automation technology has been widely applied in various fields, especially in the sewing industry, where thread insert detection technology has become a key link in improving the continuity and stability of production lines. Thread insert detection technology can monitor the remaining thread in real time, ensuring timely reminders to operators to replace it before it runs out, avoiding production interruptions, and is crucial for improving product quality and enterprise competitiveness. In existing technologies, sewing machine thread insert detection mostly relies on mechanical contacts or photoelectric sensors.

[0003] However, while these technologies have addressed the issue of insufficient bobbin thread warnings to some extent, they also have limitations. Mechanical contact detection methods are susceptible to mechanical wear, and photoelectric sensors may misjudge due to changes in ambient light, both of which can lead to detection delays, affecting the normal operation of the sewing machine and reducing production efficiency. Traditional bobbin thread detection technology has significant shortcomings, particularly in its inability to provide timely and accurate replacement reminders when the bobbin thread is nearly depleted, impacting production efficiency. Furthermore, the materials and structural design of the bobbin and bobbin case pose challenges to the sensitivity and stability of the detection system. This makes the detection signal susceptible to interference and reliability degradation when the bobbin thread balance approaches the threshold, thus limiting the application of bobbin thread detection technology in automated sewing production lines and hindering further improvements in production efficiency and quality. Summary of the Invention

[0004] The main objective of this invention is to provide a bobbin thread quantity detection device, method, and sewing machine to solve the problem of low accuracy in detecting the amount of thread on the bobbin of a sewing machine in the prior art.

[0005] To achieve the above objectives, according to a first aspect of the present invention, a bobbin thread quantity detection device is provided, comprising: two magnetic components respectively disposed on a bobbin case, the two magnetic components being disposed opposite to each other along the circumferential direction of the bobbin case; a conductor for being disposed on a bobbin, the bobbin having two contact portions respectively, the two ends of the conductor being respectively disposed corresponding to the two contact portions, at least a portion of the conductor being disposed on a rotating shaft of the bobbin, the rotating shaft being wound with a thread for providing pressure for the two ends of the conductor to move toward the two contact portions respectively; and a detection system connected to the conductor for detecting induced current on the conductor; wherein, during the rotation of the bobbin, the conductor has a closed state and a separated state respectively; when the conductor is in the closed state, the two ends of the conductor abut against the two contact portions respectively, so that the conductor and the bobbin form a closed loop and an induced current is generated in the closed loop; when the conductor is in the separated state, the two ends of the conductor are separated from the two contact portions respectively, so that no induced current is generated on the conductor.

[0006] Furthermore, two guide holes are provided on the first side of the bobbin, and two contact parts are respectively provided on the side wall of the guide holes near the axis of the rotating shaft. The two ends of the wire are respectively inserted into the two guide holes.

[0007] Furthermore, the rotating shaft includes a first shaft segment and a second shaft segment connected to each other. The first shaft segment is provided with two mounting grooves extending along its axial direction. The two mounting grooves are respectively provided with two guide holes. The two ends of the wire pass through the two mounting grooves and are respectively inserted into the two guide holes. The cross-sectional area of ​​the second shaft segment along its axial direction is smaller than that of the first shaft segment.

[0008] Furthermore, at least a portion of the bottom line is wound around the first shaft segment and contacts the outer peripheral surface of the wires passing through the two mounting slots respectively, while at least another portion of the bottom line avoids the wires being wound around the second shaft segment.

[0009] Furthermore, an arc-shaped groove is provided on the second side of the bobbin, with both ends of the arc-shaped groove connected to two mounting grooves respectively, and at least a portion of the wire is located in the arc-shaped groove; wherein, the center of the circle in which the arc-shaped groove is located coincides with the axis of the rotating shaft.

[0010] Furthermore, the shuttle shell has two mounting holes opposite each other along its circumferential direction, and two magnetic components are respectively embedded in the two mounting holes; and / or, the wire is made of a flexible metal material; and / or, the two contact parts are metal protrusions.

[0011] Furthermore, the detection system includes: a current sensor connected to both ends of the conductor via brushes for real-time detection of induced current on the conductor; a controller connected to the current sensor for receiving the induced current signal detected by the current sensor; and an alarm component connected to the controller for issuing an alarm when the controller receives a signal indicating that no induced current has been generated on the conductor.

[0012] According to a second aspect of the present invention, a sewing machine is provided, including the aforementioned bobbin thread quantity detection device.

[0013] According to a third aspect of the present invention, a method for detecting bobbin thread quantity is provided, applicable to the sewing machine mentioned above. The bobbin thread quantity detection method includes: setting an induced current threshold; acquiring a real-time induced current value on a conductor; comparing the real-time induced current value with the induced current threshold to determine whether the bobbin thread quantity is sufficient based on the comparison result.

[0014] Furthermore, based on the comparison results, it is determined whether the bottom thread on the bobbin is sufficient, including: when the real-time induced current value is greater than the induced current threshold, the bottom thread on the bobbin is sufficient and the alarm component does not issue an alarm; and / or, when the real-time induced current value is less than or equal to the induced current threshold, the bottom thread on the bobbin is insufficient, so as to control the alarm component of the detection system to issue an alarm.

[0015] The present invention provides a bobbin thread quantity detection device, comprising two magnetic components, a wire, and a detection system. The two magnetic components are respectively mounted on the bobbin case, and are arranged opposite to each other along the circumferential direction of the bobbin case. The wire is mounted on the bobbin, and the bobbin has two contact portions. The two ends of the wire are respectively positioned corresponding to the two contact portions. At least a portion of the wire is mounted on the bobbin's rotating shaft, and a thread is wound around the shaft to provide pressure for the two ends of the wire to move towards the two contact portions. The detection system is connected to the wire to detect the induced current on the wire. During the rotation of the bobbin, the wire has both closed and open states. When the wire is in the closed state, both ends of the wire abut against the two contact portions, forming a closed loop with the bobbin and generating an induced current in the closed loop. When the wire is in the open state, both ends of the wire separate from the two contact portions, so that no induced current is generated on the wire.

[0016] In this way, magnetic field lines are formed between the two magnetic components. When the bobbin rotates, the guide wire placed on it begins to cut through these magnetic field lines. When there is sufficient bobbin thread, the bobbin thread provides pressure to both ends of the guide wire, which move towards the two contact points respectively, causing the ends of the guide wire to move to the positions where they contact the two contact points and are in a closed state. The guide wire and the bobbin form a closed loop. At this time, an induced current is generated in the closed loop, and the detection system detects the induced current on the guide wire, indicating that there is sufficient bobbin thread and it is not necessary to replace the bobbin thread. When there is insufficient bobbin thread, the bobbin thread is insufficient to provide pressure to both ends of the guide wire, which are in a separated state. This causes the closed loop to break, stops the generation of induced current, and the detection system does not detect the induced current on the guide wire, indicating that there is insufficient bobbin thread and the system indicates that the bobbin thread needs to be replaced. By combining the magnetoelectric effect with a mechanical structure to detect the remaining bobbin thread, the stability and continuity of sewing are ensured, and the sewing interruption caused by bobbin thread depletion is avoided. This solves the problem of low accuracy in detecting the amount of bobbin thread on sewing machine bobbins in existing technologies and improves the overall efficiency of the production line. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a bobbin from a first perspective is shown, provided by an embodiment of the bobbin thread quantity detection device according to the present invention.

[0019] Figure 2 A second-view structural schematic diagram of a bobbin provided by an embodiment of the bobbin thread quantity detection device according to the present invention is shown;

[0020] Figure 3 A schematic diagram of the structure of a bobbin case provided in an embodiment of the bobbin thread quantity detection device according to the present invention is shown.

[0021] The above figures include the following reference numerals:

[0022] 10. Magnetic component; 20. Shuttle case; 21. Mounting hole; 30. Wire;

[0023] 40. Hairpin; 41. Rotating shaft; 410. First shaft section; 4101. Mounting groove; 411. Second shaft section; 42. First side; 420. Guide hole; 43. Second side; 430. Arc groove. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] To address the problem of low accuracy in detecting the amount of thread on a sewing machine bobbin in existing technologies, this invention provides a bobbin thread quantity detection device, method, and sewing machine.

[0026] Please refer to Figures 1 to 3 As shown, in the first aspect of the technical solution of the present invention, a bobbin 40 thread quantity detection device is provided, comprising two magnetic components 10, a wire 30, and a detection system; the two magnetic components 10 are respectively disposed on a bobbin case 20, and the two magnetic components 10 are arranged opposite to each other along the circumferential direction of the bobbin case 20; the wire 30 is disposed on the bobbin 40, the bobbin 40 is provided with two contact portions, the two ends of the wire 30 are respectively disposed corresponding to the two contact portions, at least a portion of the wire 30 is disposed on the rotating shaft 41 of the bobbin 40, and a thread is wound on the rotating shaft 41 for providing the wire 30. The two ends of the wire 30 correspond to the pressure moving towards the two contact parts respectively; the detection system is connected to the wire 30 to detect the induced current on the wire 30; wherein, during the rotation of the bobbin 40, the wire 30 has a closed state and a separated state respectively; when the wire 30 is in the closed state, the two ends of the wire 30 abut against the two contact parts respectively, so that the wire 30 and the bobbin 40 form a closed loop and an induced current is generated in the closed loop; when the wire 30 is in the separated state, the two ends of the wire 30 are separated from the two contact parts respectively, so that no induced current is generated on the wire 30.

[0027] In the first aspect of the technical solution of this invention, magnetic field lines are formed between the two magnetic components 10. When the bobbin 40 rotates, the conductor 30 disposed thereon begins to cut the magnetic field lines. When there is sufficient bobbin thread on the bobbin 40, the bobbin thread provides pressure to both ends of the conductor 30 corresponding to the two contact portions, causing the two ends of the conductor 30 to move to the position of contact with the two contact portions and be in a closed state. The conductor 30 and the bobbin 40 form a closed loop. At this time, an induced current is generated in the closed loop, and the detection system detects the induced current generated in the conductor 30, that is, there is sufficient bobbin thread on the bobbin 40, and there is no need to replace the bobbin thread. However, when there is insufficient bobbin thread on the bobbin 40, the bobbin thread is insufficient to provide pressure to both ends of the conductor 30 corresponding to the two contact portions, the conductor 30 is in a separated state, and the closed loop is broken, the induced current is stopped, the detection system does not detect the induced current generated in the conductor 30, that is, there is insufficient bobbin thread on the bobbin 40, and the system indicates that the bobbin thread needs to be replaced. By combining the magnetoelectric effect with a mechanical structure to detect the remaining bobbin thread on the bobbin 40, the stability and continuity of sewing are ensured, and the sewing interruption caused by the depletion of bobbin thread is avoided. This solves the problem of low accuracy in detecting the amount of bobbin thread on the sewing machine bobbin 40 in the prior art, and improves the overall efficiency of the production line.

[0028] In this embodiment, both magnetic components 10 are magnets.

[0029] like Figure 1 As shown, two guide holes 420 are provided opposite each other on the first side portion 42 of the bobbin 40. Two contact portions are respectively disposed on the side wall of the two guide holes 420 near the axis of the rotating shaft 41. The two ends of the wire 30 are respectively inserted into the two guide holes 420. In this way, by setting the contact portions on the side wall of the guide holes 420 near the axis of the rotating shaft 41, it is ensured that when the bottom thread on the rotating shaft 41 is sufficient, the two ends of the wire 30 make stable contact with the two contact portions to form a closed loop. Even under different bottom thread amounts, the induced current on the wire 30 can be accurately detected, improving the reliability of bottom thread amount detection. It also allows the guide holes 420 to effectively position the wire 30 during the rotation of the bobbin 40, while preventing the two ends of the wire 30 from directly contacting the two contact portions, thus avoiding affecting the reliability of the detection results.

[0030] Specifically, the rotating shaft 41 includes a first shaft segment 410 and a second shaft segment 411 connected to each other. The first shaft segment 410 has two mounting grooves 4101 extending along its axial direction, which are respectively positioned to correspond to two guide holes 420. The two ends of the wire 30 pass through the two mounting grooves 4101 and are then inserted into the two guide holes 420. The cross-sectional area of ​​the second shaft segment 411 along its axial direction is smaller than that of the first shaft segment 410. In this embodiment, the second shaft segment 411 is disposed between the first shaft segment 410 and the first side portion 42; alternatively, the first shaft segment 410 may be disposed between the second shaft segment 411 and the first side portion 42. In this way, the outer peripheral surfaces of the first shaft segment 410 and the second shaft segment 411 form a stepped structure. The wire 30 passes through the mounting groove 4101 on the first shaft segment 410 along its extension direction and passes through the outer peripheral surface of the second shaft segment 411 before passing through the guide hole 420. This helps to stabilize the movement path of the wire 30 and allows sufficient bottom thread wound on the rotating shaft 41 to fully contact the outer peripheral surface of the wire 30, providing pressure for the two ends of the wire 30 to move towards the two contact parts respectively. This allows the wire 30 to accurately contact the two contact parts to form a closed loop with the bobbin 40, thereby improving the accuracy of detecting the amount of bottom thread on the bobbin 40.

[0031] Specifically, at least a portion of the bobbin thread is wound around the first shaft section 410 and contacts the outer circumferential surface of the wires 30 passing through the two mounting slots 4101, while at least another portion of the bobbin thread is wound around the second shaft section 411, avoiding the wires 30. In this way, with at least a portion of the bobbin thread wound around the first shaft section 410 and in contact with the wires 30, the contact area decreases as the bobbin 40 rotates, thus affecting the induced current on the wires 30. This allows the detection system to more accurately monitor changes in the amount of bobbin thread, improving detection sensitivity and accuracy. The fact that at least another portion of the bobbin thread is wound around the second shaft section 411 ensures that a certain amount of excess thread remains on the bobbin 40 during sewing, preventing delayed alarms due to insufficient bobbin thread on the shaft 41 during sewing.

[0032] like Figure 2As shown, the second side 43 of the bobbin 40 is provided with an arc-shaped groove 430, the two ends of which are connected to two mounting grooves 4101 respectively. At least a portion of the wire 30 is located within the arc-shaped groove 430; wherein, the center of the circle containing the arc-shaped groove 430 coincides with the axis of the rotating shaft 41. In this way, at least a portion of the wire 30 achieves a smooth transition on the second side 43 of the bobbin 40 through the arc-shaped groove 430, utilizing the space of the second side 43, allowing the wire 30 and key components such as the contact part to be arranged more compactly, reducing mutual interference between components, and extending the service life of the wire 30. Meanwhile, the design of the arc groove 430 combined with the mounting groove 4101 and the through hole of the wire 30 simplifies the assembly process of the wire 30. It is only necessary to pass the end of the wire 30 through the mounting groove 4101 and the guide hole 420 and arrange the rest along the path of the arc groove 430, so that the wire 30 can be firmly embedded on the bobbin 40, avoiding interference from the movement of oil, lint and other substances, ensuring the accuracy and stability of the detection precision, eliminating the need for a complex positioning and fixing structure, and facilitating its maintenance.

[0033] In this embodiment, the two ends of the wire 30 that pass through the two guide holes 420 are respectively provided with conductive materials such as graphite, and respectively contact the shuttle shell 20 to conduct the induced current on the wire 30.

[0034] Specifically, the bobbin case 20 has two mounting holes 21 facing each other along its circumferential direction, and two magnetic components 10 are respectively embedded in the two mounting holes 21. In this way, a magnetic field is formed between the two magnetic components 10. When the bobbin 40 rotates within the lock case, the conductor 30 cuts the magnetic lines of force, thereby generating an induced current when the conductor 30 and the bobbin 40 form a closed loop. The presence or absence of an induced current in the conductor 30 is used to detect whether the bottom thread on the bobbin 40 is sufficient. Simultaneously, the magnetic components 10 are embedded in the mounting holes 21, simplifying the assembly process, eliminating the need for complex fixing structures, facilitating later maintenance and replacement, and reducing maintenance costs and time.

[0035] In this embodiment, the conductor 30 is made of an elastic metallic material. This ensures that when the ground wire on the rotating shaft 41 is sufficient, it can provide enough pressure to the conductor 30, allowing stable contact between the two ends of the conductor 30 and the two contact portions. Simultaneously, the elastic metallic material has a certain self-restoring capability, so that when the ground wire on the rotating shaft 41 is insufficient and can no longer provide the pressure for the conductor 30's movement, the conductor 30 returns to its original shape, and the two ends of the conductor 30 separate from the two contact portions. At this point, no induced current is generated on the conductor 30.

[0036] In this embodiment, the two contact portions are metal protrusions. These contact portions protrude from the wall of the guide hole 420. Thus, the metal protrusions, acting as contact portions, possess excellent electrical conductivity, ensuring the formation of a stable closed loop when in contact with the wire 30. This facilitates the generation and transmission of induced current, thereby improving the signal stability and accuracy when detecting changes in the linear quantity of the bobbin 40.

[0037] Specifically, the detection system includes a current sensor, a controller, and an alarm component. The current sensor is connected to both ends of the conductor 30 via brushes to detect the induced current on the conductor 30 in real time. The controller is signal-connected to the current sensor to receive the induced current signal detected by the current sensor. The alarm component is signal-connected to the controller to issue an alarm when the controller detects no induced current on the conductor 30. The current sensor is a current acquisition card.

[0038] In this way, the current sensor is connected to both ends of the wire 30 via a brush, enabling real-time monitoring of changes in the induced current on the wire 30. This allows for timely reflection of changes in the bobbin thread quantity on the bobbin 40, improving the real-time performance and sensitivity of the detection. The controller receives the signal from the current sensor and can automatically determine whether the bobbin thread quantity is sufficient based on a preset threshold, eliminating the need for frequent manual checks. This automates bobbin thread quantity detection, enhances the intelligence level of the sewing machine, and improves production efficiency. Through an alarm component connected to the controller, when the controller detects no induced current on the wire 30 or the current is below the set threshold, it immediately triggers an alarm, sending a clear signal to the operator to remind them to replace the bobbin 40 in time. This prevents sewing interruptions due to bobbin thread depletion, ensuring efficient and stable sewing processes and reducing production losses. The connection between the current sensor and the wire 30 via a brush, compared to direct contact, reduces the problem of poor contact and improves the stability of signal transmission. The controller's signal processing further enhances the system's stability, maintaining good detection performance even in harsh working environments.

[0039] According to a second aspect of the present invention, a sewing machine is provided, including the aforementioned bobbin 40 thread quantity detection device. This device enables automatic and real-time monitoring of the bobbin thread quantity, effectively avoiding the tedious manual periodic checks of bobbin thread quantity, improving the automation level of the sewing machine, and enhancing operational convenience and the continuity of the sewing process. Furthermore, it can issue a timely warning before the bobbin thread is nearly exhausted, allowing the operator to quickly replace the bobbin 40, preventing production interruptions due to bobbin thread depletion, and significantly improving the efficiency and capacity of the production line.

[0040] According to a third aspect of the present invention, a method for detecting the amount of thread on a bobbin 40 is provided, applicable to the aforementioned sewing machine. The method includes: setting an induced current threshold; acquiring the real-time induced current value on the guide wire 30; and comparing the real-time induced current value with the induced current threshold to determine whether the amount of bobbin thread on the bobbin 40 is sufficient based on the comparison result. Thus, by setting a specific induced current threshold as a reference, a connection can be established between the amount of bobbin thread on the bobbin 40 and the induced current value on the guide wire 30. By monitoring changes in the induced current, precise quantification of the bobbin thread amount can be achieved, improving the accuracy and reliability of the detection. Simultaneously, the magnitude of the generated induced current can also reflect the rotational speed of the bobbin 40 in real time. After acquiring the induced current value on the guide wire 30, it is compared with the set threshold to determine whether the amount of bobbin thread on the bobbin 40 is sufficient. If insufficient, an alarm is triggered, ensuring that the bobbin 40 can be replaced in time before the bobbin thread is exhausted, avoiding sewing interruptions and improving production efficiency.

[0041] Specifically, the system determines whether the bobbin 40 has sufficient thread based on the comparison results. This includes: when the real-time induced current value is greater than the induced current threshold, the bobbin 40 has sufficient thread, and the alarm component does not issue an alarm; and / or, when the real-time induced current value is less than or equal to the induced current threshold, the bobbin 40 has insufficient thread, thus controlling the alarm component of the detection system to issue an alarm. In this way, by setting a suitable induced current threshold, the sufficiency of the bobbin thread can be effectively converted into a quantifiable current value, achieving a shift from qualitative to quantitative assessment and improving the accuracy of the thread quantity judgment. Once the real-time induced current value is detected to be lower than the set threshold, an alarm is immediately triggered, providing immediate feedback so that the operator can take timely measures to replace the bobbin 40, avoiding production stoppages due to thread depletion and enhancing the continuity and stability of the sewing machine operation. When the real-time induced current value is greater than the threshold, the alarm component is not activated. This mechanism effectively avoids false alarms caused by slight current fluctuations, improving the reliability and dependability of the detection system. This improves detection accuracy, enhances user experience, optimizes the production process, achieves intelligent control and efficient operation of the sewing machine, and ultimately improves production efficiency and product quality.

[0042] In this application, the magnetoelectric effect is used as the detection principle. First, a reasonable magnetic field condition is constructed for the bobbin case 20 and bobbin 40. A connecting wire 30 for cutting magnetic field lines is set in the bobbin 40. The magnetoelectric effect generates current to provide feedback on the bottom thread status. When there is enough bottom thread on the bobbin 40, the cutting wire 30 inside the bobbin 40 is pressed and connected to the contact part on the bobbin 40, so that the wire 30 is in a closed circuit state. At this time, the rotation of the bobbin 40 is manifested as current in the circuit. This current is transmitted to the PC through the current acquisition card. The PC inputs the current signal into the judgment process, and the terminal displays the bottom thread status as sufficient, without the need to replace the bottom thread. When there is insufficient bottom thread on the bobbin 40, the winding force of the bottom thread on the bobbin 40 is insufficient, so the contact pressure of the bobbin wire 30 is insufficient and it disconnects from the contact part on the bobbin 40. The circuit is in an open state, no induced current is generated, and there is no current signal in the current acquisition card. The current information on the PC is processed through the judgment process to alarm the remaining bottom thread. At this time, the operator can stop the machine and replace it with a new bottom thread.

[0043] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0044] The bobbin 40 thread quantity detection device includes two magnetic components 10, a wire 30, and a detection system. The two magnetic components 10 are respectively mounted on the bobbin case 20 and are arranged opposite to each other along the circumferential direction of the bobbin case 20. The wire 30 is mounted on the bobbin 40, which has two contact portions. The two ends of the wire 30 are respectively positioned corresponding to the two contact portions. At least a portion of the wire 30 is mounted on the bobbin 40's rotating shaft 41, and a thread is wound on the rotating shaft 41 to provide pressure for the two ends of the wire 30 to move toward the two contact portions respectively. The detection system is connected to the wire 30 to detect the induced current on the wire 30. During the rotation of the bobbin 40, the wire 30 has a closed state and a separated state. When the wire 30 is in the closed state, the two ends of the wire 30 abut against the two contact portions, so that the wire 30 and the bobbin 40 form a closed loop and an induced current is generated in the closed loop. When the wire 30 is in the separated state, the two ends of the wire 30 are separated from the two contact portions, so that no induced current is generated on the wire 30. In this way, magnetic field lines are formed between the two magnetic components 10. When the bobbin 40 rotates, the conductor 30 placed on it begins to cut the magnetic field lines. When there is sufficient bobbin thread on the bobbin 40, the bobbin thread provides pressure to both ends of the conductor 30, which move towards the two contact points respectively. This causes the ends of the conductor 30 to move to the position of contact with the two contact points and be in a closed state. The conductor 30 and the bobbin 40 form a closed loop. At this time, an induced current is generated in the closed loop, and the detection system detects the induced current generated in the conductor 30, indicating that there is sufficient bobbin thread on the bobbin 40 and there is no need to replace the bobbin thread. However, when there is insufficient bobbin thread on the bobbin 40, the bobbin thread is insufficient to provide pressure to both ends of the conductor 30, which are in a separated state. This causes the closed loop to break, stops the generation of induced current, and the detection system does not detect the induced current generated in the conductor 30, indicating that there is insufficient bobbin thread on the bobbin 40 and the system indicates that the bobbin thread needs to be replaced. By combining the magnetoelectric effect with a mechanical structure to detect the remaining bobbin thread on the bobbin 40, the stability and continuity of sewing are ensured, and the sewing interruption caused by the depletion of bobbin thread is avoided. This solves the problem of low accuracy in detecting the amount of bobbin thread on the sewing machine bobbin 40 in the prior art, and improves the overall efficiency of the production line.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0047] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0048] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0049] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bobbin thread quantity detection device, characterized in that, include: Two magnetic components (10) are respectively used to be disposed on the shuttle shell (20), and the two magnetic components (10) are disposed opposite to each other along the circumferential direction of the shuttle shell (20); A guide wire (30) is used to be disposed on a bobbin (40), which has two contact portions respectively. The two ends of the guide wire (30) are respectively disposed corresponding to the two contact portions. At least a portion of the guide wire (30) is disposed on the shaft (41) of the bobbin (40), and the shaft (41) is wound with a bottom thread to provide pressure for the two ends of the guide wire (30) to move toward the two contact portions respectively. A detection system is connected to the wire (30) for detecting the induced current on the wire (30); During the rotation of the bobbin (40), the conductor (30) has a closed state and a separated state. When the conductor (30) is in the closed state, both ends of the conductor (30) abut against the two contact parts, so that the conductor (30) and the bobbin (40) form a closed loop and an induced current is generated in the closed loop. When the conductor (30) is in the separated state, both ends of the conductor (30) are separated from the two contact parts, so that no induced current is generated on the conductor (30).

2. The bobbin thread quantity detection device according to claim 1, characterized in that, The first side (42) of the bobbin (40) is provided with two guide holes (420) facing each other. The two contact parts are respectively provided on the side wall of the two guide holes (420) near the axis of the rotating shaft (41). The two ends of the wire (30) are respectively inserted into the two guide holes (420).

3. The bobbin thread quantity detection device according to claim 2, characterized in that, The rotating shaft (41) includes a first shaft segment (410) and a second shaft segment (411) connected to each other. The first shaft segment (410) is provided with two mounting grooves (4101) extending along its axial direction. The two mounting grooves (4101) are respectively provided with two guide holes (420). The two ends of the wire (30) pass through the two mounting grooves (4101) and are then inserted into the two guide holes (420). The cross-sectional area of ​​the second shaft segment (411) along its axial direction is smaller than the cross-sectional area of ​​the first shaft segment (410).

4. The bobbin thread quantity detection device according to claim 3, characterized in that, At least a portion of the bottom line is wrapped around the first shaft segment (410) and contacts the outer peripheral surface of the wire (30) passing through the two mounting slots (4101), respectively, while at least another portion of the bottom line avoids the wire (30) and is wrapped around the second shaft segment (411).

5. The bobbin thread quantity detection device according to claim 4, characterized in that, The second side (43) of the bobbin (40) is provided with an arc-shaped groove (430), the two ends of the arc-shaped groove (430) are respectively connected to the two mounting grooves (4101), and at least a portion of the wire (30) is located in the arc-shaped groove (430); The center of the circle containing the arc groove (430) coincides with the axis of the rotating shaft (41).

6. The bobbin thread quantity detection device according to claim 1, characterized in that, The shuttle shell (20) has two mounting holes (21) opposite each other along its circumferential direction, and the two magnetic components (10) are respectively embedded in the two mounting holes (21); and / or, The conductor (30) is made of a flexible metallic material; and / or, The two contact portions are metal protrusions.

7. The bobbin thread quantity detection device according to claim 1, characterized in that, The detection system includes: A current sensor is connected to both ends of the wire (30) via brushes to detect the induced current on the wire (30) in real time. A controller is connected to the current sensor to receive the induced current signal detected by the current sensor. An alarm component, signal-connected to the controller, is used to issue an alarm when the controller receives a signal that no induced current is generated on the wire (30).

8. A sewing machine, characterized in that, The device includes the bobbin thread quantity detection device according to any one of claims 1 to 7.

9. A method for detecting bobbin thread quantity, applicable to the sewing machine described in claim 8, characterized in that, The bobbin thread quantity detection method includes: Set the induced current threshold; Obtain the real-time induced current value on the conductor (30); The real-time induced current value is compared with the induced current threshold to determine whether the bottom line quantity on the bobbin (40) is sufficient based on the comparison result.

10. The method for detecting the amount of bobbin thread according to claim 9, characterized in that, The step of determining whether the bottom thread on the bobbin (40) is sufficient based on the comparison results includes: When the real-time sensed current value is greater than the sensed current threshold, the bottom line quantity on the bobbin (40) is sufficient, and the alarm component does not issue an alarm; and / or, When the real-time induced current value is less than or equal to the induced current threshold, the bottom line quantity on the bobbin (40) is insufficient, so as to control the alarm component of the detection system to issue an alarm.

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