Bottom thread detection device of sewing machine and sewing machine

Abstract

The utility model relates to a bottom thread detection device of a sewing machine and the sewing machine, and the bottom thread detection device of the sewing machine comprises a sewing machine bottom plate, the shuttle peg is rotationally mounted on the shuttle frame, and a bottom thread is wound on the shuttle peg; the detection assembly is used for detecting the bottom line at the shuttle peg through an optical signal, and an optical signal transmission area is arranged between the detection assembly and the shuttle peg; and the dust collection device acts on the optical signal transmission area. According to the technical scheme, foreign matters around the detection assembly and in the optical signal transmission area are cleaned through the dust collection device, the risk that an optical path of the detection assembly is polluted is avoided, the detection success probability is increased, and the stability is improved.

Description

Technical Field

[0001] This application relates to the field of sewing equipment technology, and more particularly to a bottom thread detection device for a sewing machine and a sewing machine. Background Technology

[0002] Existing sewing machines pose a risk of running out of thread thread, resulting in multiple needle holes in the fabric. This affects the appearance and can even render the fabric unusable, such as leather or fabrics requiring air tightness. Therefore, it is necessary to monitor thread thread consumption and provide alerts.

[0003] In existing technologies, a laser sensor is typically installed at the bottom of the bobbin case. The laser illuminates a reflective surface inside the bobbin; when the thread is nearly exhausted, the bobbin exposes the reflective surface and reflects the beam back, allowing the laser sensor to determine the thread's condition. However, in actual operation, dust, broken thread, and common thread lint may accumulate inside the bobbin case. These foreign objects may exist between the laser sensor and the bobbin, causing the laser sensor to fail to trigger or trigger falsely, posing a potential hazard.

[0004] Those skilled in the art have attempted to overcome the aforementioned problems by using an air-blowing device to remove foreign objects near the light source of the laser sensor. However, this method still has drawbacks. For example, the internal space of the housing is limited, and foreign objects driven by the air-blowing device may interfere with the operation of other components. Furthermore, broken wires and lint may accumulate and clump together under high-intensity continuous operation, reducing the air-blowing efficiency and thus affecting the normal operation of the bottom line detection function. Therefore, there is room for further improvement in the existing technology. Utility Model Content

[0005] This application provides a bottom thread detection device for a sewing machine. By using a dust extraction device to clean foreign objects around the detection component and the optical signal transmission area, the risk of contamination of the optical path of the detection component is avoided, thereby increasing the detection success rate and improving stability.

[0006] One embodiment of this application discloses a bottom thread detection device for a sewing machine, comprising:

[0007] A sewing machine base plate, with a shuttle frame fixed underneath it;

[0008] A bobbin is rotatably mounted on the bob frame, and a bobbin thread is wound around the bobbin.

[0009] The detection component detects the bottom line at the bobbin core using optical signals, and the area between the detection component and the bobbin core is an optical signal transmission area;

[0010] A vacuuming device is applied to the optical signal transmission area.

[0011] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0012] In one embodiment, the detection assembly includes a light source generator and a light source receiver arranged along an optical path, wherein the optical path originates from the light source generator and is reflected from the outer periphery of the spindle core to the light source receiver;

[0013] The light source generator and the light source receiver can be integrated or configured independently.

[0014] In one embodiment, the vacuuming device includes a Laval nozzle for generating a vacuum and is accordingly configured with:

[0015] The air inlet is used to connect to the air source;

[0016] The air intake is equipped with an air nozzle that faces the optical signal transmission area.

[0017] The air outlet is connected to the air inlet and the air intake.

[0018] In one embodiment, the air intake has a flared structure.

[0019] In one embodiment, the detection component is located on one side of the spindle core, and the suction direction of the vacuuming device intersects with the optical path direction of the detection component.

[0020] In one embodiment, the vacuuming device and the detection component are stacked in the direction of gravity, with the vacuuming device located below the detection component.

[0021] In one embodiment, a mounting bracket is fixed on the sewing machine base plate, the detection component is mounted above the mounting bracket, the dust collection device is disposed below the mounting bracket, and the mounting bracket partially obstructs the air intake of the dust collection device.

[0022] In one embodiment, the mounting bracket has a clearance window on its side edge near the optical signal transmission area. The clearance window is aligned with the optical path of the detection component and connects the air intake to the optical signal transmission area.

[0023] In one embodiment, the vacuuming device further includes:

[0024] A collection container is connected to the air outlet of the vacuum cleaner, and the collection container contains filter material.

[0025] One embodiment of this application also discloses a sewing machine, including the bottom thread detection device described in the above technical solution.

[0026] The technical solution disclosed in this application uses a vacuum cleaner to remove foreign objects that may enter the optical signal transmission area, thereby ensuring the optical path between the detection component and the spindle core and improving stability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the bottom thread detection device of a sewing machine in one embodiment of this application;

[0029] Figure 2 for Figure 1 An enlarged schematic diagram of the area shown;

[0030] Figure 3 This is a schematic diagram of the bottom thread detection device in one embodiment of this application (the sewing machine base plate and sewing machine housing are omitted).

[0031] Figure 4 for Figure 3 A top-view schematic diagram of the structure of the center-line detection device;

[0032] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure at point AA shown in the figure;

[0033] Figure 6 This is a schematic diagram of the dust collection device structure of the bottom line detection device in one embodiment of this application;

[0034] Figure 7 for Figure 6 A top-view diagram of the dust collection device of the baseline detection system;

[0035] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure at BB shown in the figure;

[0036] Figure 9 This is a schematic diagram of the collection container of the bottom line detection device in one embodiment of this application.

[0037] The component labels are as follows:

[0038] 100. Sewing machine base plate; 110. Mounting bracket; 111. Clearance window;

[0039] 200. Shuttle core;

[0040] 300. Detection component; 301. Optical signal transmission area;

[0041] 400. Dust collection device; 410. Air inlet; 411. Primary diameter reduction section; 412. Secondary diameter reduction section; 420. Air intake; 421. Air nozzle; 422. Negative pressure chamber; 430. Air outlet; 431. Laval nozzle; 440. Collection container; 441. Collection port; 442. Discharge port. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0043] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level (or in a usage state, or from a certain viewpoint in the drawing) than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level (or in a usage state, or from a certain viewpoint in the drawing) than the second feature.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0047] Reference Appendix Figure 1 To be continued Figure 2 As shown, one embodiment of this application discloses a sewing machine bottom thread detection device, including a sewing machine base plate 100 and a bobbin 200, a detection component 300, and a dust collection device 400 installed on the sewing machine base plate 100. The dust collection device 400 cleans foreign objects around the detection component 300 and the optical signal transmission area 301, avoiding the risk of contamination of the optical path of the detection component 300, increasing the probability of successful detection, and improving stability.

[0048] Specifically, a shuttle frame is fixed below the sewing machine base plate 100. A bobbin 200 is rotatably mounted on the shuttle frame, and the bobbin thread is wound around the bobbin 200, with the bobbin thread being released from the bobbin 200 for sewing. A detection component 300 detects the bobbin thread at the bobbin 200 via a light signal; the area between the detection component 300 and the bobbin 200 is a light signal transmission area 301. A vacuuming device 400 acts on the light signal transmission area 301, removing foreign objects from within and around the light signal transmission area 301. Compared to the blowing device in the prior art, the vacuuming device 400 in this embodiment can remove foreign objects more controllably, thereby avoiding the impact of foreign objects on surrounding components and the decrease in vacuuming performance caused by the accumulation of foreign objects.

[0049] The layout of each component can be referenced in the appendix. Figure 3 To be continued Figure 5In the illustrated embodiment, the detection component 300 includes a light source generator and a light source receiver arranged along the optical path, wherein the optical path originates from the light source generator, is reflected from the outer periphery of the bobbin 200, and reaches the light source receiver. The area traversed by the optical path is the optical signal transmission area 301 mentioned above. The optical path can be configured in various ways, for example, the light source generator and the light source receiver can be configured independently, with the light from the light source generator being reflected from the outer periphery of the bobbin 200 to a light source receiver at another location; another example is... Figure 3 To be continued Figure 5 As shown, the light source generator and light source receiver are integrated, and the light from the light source generator is reflected along the original path from the outer periphery of the spindle core 200 to the light source receiver at the same position. Correspondingly, the vacuuming device 400 can enlarge the air intake 420 to accommodate changes in the light signal transmission area 301, or it can be provided with multiple air intakes 420 to cover different light signal transmission areas 301. Furthermore, the vacuuming device 400 can also increase its number to correspond to different light signal transmission areas 301.

[0050] Reference Appendix Figure 3 In the illustrated embodiment, the detection component 300 is located on one side of the bobbin 200, and the suction direction of the vacuuming device 400 intersects with the optical path direction of the detection component 300. Preferably, the suction direction of the vacuuming device 400 is perpendicular to the optical path direction of the detection component 300 to optimize the relative positional relationship of the components. The suction direction of the vacuuming device 400 can be understood as the orientation of the suction nozzle 421 in the following text.

[0051] The detection component 300 and the vacuuming device 400 can be installed independently or together, as shown in the attached document. Figure 5 In the illustrated embodiment, the vacuuming device 400 and the detection component 300 are stacked in the direction of gravity, with the vacuuming device 400 located below the detection component 300. Foreign objects can more easily enter the suction port 420 of the vacuuming device 400 due to their own gravity. Furthermore, a mounting bracket 110 is fixed on the sewing machine base plate 100, with the detection component 300 mounted above the mounting bracket 110 and the vacuuming device 400 positioned below it. The vacuuming device 400 can be mounted on the mounting bracket 110 or can move relative to it. When both the vacuuming device 400 and the detection component 300 are mounted on the mounting bracket 110, the detection component 300 can be adjusted synchronously when adjusting its relative position to the bobbin 200. In this embodiment, the mounting bracket 110 partially obstructs the air intake 420 of the vacuum cleaner 400. This arrangement not only provides a more compact mounting layout for the detection component 300 and the vacuum cleaner 400, but also concentrates the suction power of the vacuum cleaner 400 on the optical signal transmission area 301, improving its performance. Therefore, the mounting bracket 110 can simultaneously provide a mounting base and adjust the performance of the vacuum cleaner 400. (See attached...) Figure 5 In the embodiment shown, the side edge of the detection component 300 is retracted relative to the side edge of the mounting bracket 110, and the center position of the suction nozzle 421 of the vacuuming device 400 is close to the side edge of the mounting bracket 110.

[0052] Based on this, refer to the appendix Figure 2 To be continued Figure 5 In the illustrated embodiment, a clearance window 111 is provided on the side edge of the mounting bracket 110 near the optical signal transmission area 301. The clearance window 111 is aligned with the optical path of the detection component 300 and connects the air intake 420 and the optical signal transmission area 301. The clearance window 111 can further adjust the operating performance of the vacuum cleaner 400. For example, in the attached... Figure 4 In the middle, the avoidance window 111 is a slit slightly wider than the light path, thereby further concentrating the suction power of the vacuuming device 400 on the light signal transmission area 301. (Attached) Figure 4 In this system, the vacuuming device 400 removes light signal transmission area 301 through the suction nozzle 421. In the projection along the direction of gravity, the mounting bracket 110 blocks 30% to 70% of the maximum area of ​​the suction nozzle 421, while the clearance window 111 occupies 5% to 20% of the maximum area of ​​the suction nozzle 421. The clearance window 111 is located near the center of the suction nozzle 421.

[0053] The suction power of the vacuum cleaner 400 can come from various sources, such as a negative pressure source outside the sewing machine, or as shown in the appendix. Figure 1 In the illustrated embodiment, the vacuuming device 400 is positioned below the sewing machine base plate 100 and generates negative pressure by itself. The specific structure of the vacuuming device 400 can be found in the attached diagram. Figure 6 To be continued Figure 8 In the embodiment shown, the vacuuming device 400 includes a Laval nozzle 431 for generating a vacuum and is accordingly configured with:

[0054] Air inlet 410 is used to connect to the air source;

[0055] The air intake 420 is equipped with an air nozzle 421 facing the optical signal transmission area 301;

[0056] The air outlet 430 is connected to the air inlet 410 and the air intake 420.

[0057] In this embodiment, the air source provides airflow that passes through the air inlet 410 and the air outlet 430, and through the Laval nozzle 431, creates a negative pressure at the suction port 420. The suction nozzle 421 uses the negative pressure at the suction port 420 to remove dust from the optical signal transmission area 301. Furthermore, the suction nozzle 421 has a flared structure. The internal structure of the dust collection device 400 can be referred to in the attached diagram. Figure 7 To be continued Figure 8As shown, between the air inlet 410 and the air outlet 430, there are sequentially connected primary diameter reduction section 411, secondary diameter reduction section 412, negative pressure chamber 422, Laval nozzle 431, and air intake 420 connected to negative pressure chamber 422 in the airflow direction. The inner diameter of secondary diameter reduction section 412 is smaller than the inner diameter of primary diameter reduction section 411, which is smaller than the inner diameter of air inlet 410.

[0058] During the airflow movement, the flow rate equation Q = VA is satisfied, where Q is the flow rate, V is the velocity, and A is the cross-sectional area. The airflow supplied by the air source moves from the inlet 410 to the first narrowing section 411. Because the cross-sectional area decreases here, when the external flow rate is constant, the velocity is inversely proportional to the cross-sectional area, thus increasing the airflow velocity. Similarly, when the airflow reaches the second narrowing section 412, the cross-sectional area further decreases, further increasing the velocity. The high-speed airflow, accelerated twice, creates a negative pressure relative to the external environment of the intake port 420 within the negative pressure chamber 422. Airflow from the external environment flows from the intake nozzle 421 to the negative pressure chamber 422 and enters the downstream Laval nozzle 431. The Laval nozzle 431 ultimately ejects the airflow rapidly to the outlet 430. During this process, the gas in the external environment drives foreign objects from the optical signal transmission area 301 into the dust collection device 400 and carries them away from the environment below the sewing machine base plate 100 through the exhaust port.

[0059] To further collect foreign objects and prevent them from affecting the production environment, please refer to the attached document. Figure 9 In the illustrated embodiment, the vacuum cleaner 400 further includes a collection container 440, which is connected to the air outlet 430 of the vacuum cleaner 400. The collection container 440 contains filter material. The collection container 440 includes a collection port 441 connected to the air outlet 430 and an exhaust port 442 connected to the external environment. The filter material is located between the collection port 441 and the exhaust port 442. Depending on the characteristics of the foreign object, the filter material can be a common porous material with different pore sizes, an adsorbent material with an electric field, or a fluid with viscous resistance (such as water or oil). After being sucked into the collection container 440, the foreign object is constrained by the filter material, preventing it from being propelled out of the collection container 440 by the airflow and affecting the sewing environment.

[0060] Combining the above and the appendix Figure 1As shown, one embodiment of this application also discloses a sewing machine, including the thread thread detection device described above. The specific cooperation structure is detailed above and will not be repeated here. During use, the thread thread detection device can be linked with the sewing machine's main shaft motor. That is, when the sewing machine is sewing, the dust collection device 400 of the thread thread detection device continuously operates to provide a highly clean production environment. The dust collection device 400 of the thread thread detection device can also be activated on demand, for example, to remove foreign objects according to user instructions or after meeting predetermined conditions. Predetermined conditions can be timed or triggered when the sewing machine performs a specific action, such as when a thread-cutting action occurs during sewing, after which the dust collection device 400 of the thread thread detection device is activated to remove foreign objects such as lint, thread ends, and broken threads.

[0061] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A bottom thread detection device for a sewing machine, characterized in that, include: A sewing machine base plate, with a shuttle frame fixed underneath it; A bobbin is rotatably mounted on the bob frame, and a bobbin thread is wound around the bobbin. The detection component detects the bottom line at the bobbin core using optical signals, and the area between the detection component and the bobbin core is an optical signal transmission area; A vacuuming device is applied to the optical signal transmission area.

2. The sewing machine thread detection device according to claim 1, characterized in that, The detection assembly includes a light source generator and a light source receiver arranged along the optical path, wherein the optical path originates from the light source generator and is reflected from the outer periphery of the spindle core to the light source receiver; The light source generator and the light source receiver can be integrated or configured independently.

3. The sewing machine thread detection device according to claim 2, characterized in that, The vacuuming device includes a Laval nozzle for generating a vacuum and is accordingly configured with: The air inlet is used to connect to the air source; The air intake is equipped with an air nozzle that faces the optical signal transmission area. The air outlet is connected to the air inlet and the air intake.

4. The sewing machine thread detection device according to claim 3, characterized in that, The air intake nozzle has a flared structure.

5. The thread detection device for a sewing machine according to claim 1, characterized in that, The detection component is located on one side of the spindle core, and the suction direction of the dust collection device intersects with the optical path direction of the detection component.

6. The sewing machine thread detection device according to claim 1, characterized in that, In the direction of gravity, the vacuuming device and the detection component are stacked, with the vacuuming device located below the detection component.

7. The thread detection device for a sewing machine according to claim 1, characterized in that, A mounting bracket is fixed on the base plate of the sewing machine, the detection component is installed above the mounting bracket, the dust collection device is located below the mounting bracket, and the mounting bracket partially blocks the air intake of the dust collection device.

8. The thread detection device for a sewing machine according to claim 7, characterized in that, The mounting bracket has a clearance window on its side edge near the optical signal transmission area. The clearance window is aligned with the optical path of the detection component and connects the air intake to the optical signal transmission area.

9. The thread detection device for a sewing machine according to claim 1, characterized in that, The vacuuming device also includes: A collection container is connected to the air outlet of the vacuum cleaner, and the collection container contains filter material.

10. A sewing machine, characterized in that, The bottom line detection device includes any one of claims 1 to 9.

Images