Bottom thread detection structure of sewing machine

Abstract

The utility model provides a bottom line detection structure of a sewing machine, and belongs to the technical field of sewing machines. The sewing machine comprises a rack, a bottom thread rotating shuttle is arranged in the rack, the detection structure comprises a photoelectric sensor, the rack is connected with a sensor supporting frame, the sensor supporting frame is provided with a light guide channel and a sensor installation hole communicated with the light guide channel, and the photoelectric sensor is installed in the sensor installation hole. The two ends of the light guide channel are right opposite to the sensing end of the photoelectric sensor and the bottom thread rotating shuttle respectively, and an air inlet nozzle communicated with the light guide channel is connected to the sensor supporting frame. The photoelectric sensor is arranged in the sensor supporting frame, direct exposure of the sensing end of the photoelectric sensor is avoided, the sensing end of the photoelectric sensor can form a protection channel through the arrangement of the light guide channel, the air blowing device blows out air, the light guide channel is cleaned, and lint and impurities in the light guide channel are blown out of the sensor supporting frame. The accuracy of bottom line detection and the service life of the photoelectric sensor are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a bottom thread detection structure of a sewing machine. Background Art

[0002] A sewing machine is a mechanical device used for sewing, mending, cutting and making clothing and other textiles. It is a common household and industrial tool. The sewing process usually requires the use of suture thread and bobbin thread, which are two different threads in the sewing machine. The suture thread passes through the needle of the sewing machine, and the bobbin thread is the thread on the bobbin thread shuttle of the sewing machine. The bobbin thread is wound on the bobbin thread shuttle. The needle and the bobbin thread shuttle cooperate to interweave the suture thread and the bobbin thread to form a stitch. Since the bobbin thread is inside the frame of the sewing machine, it is not easy to find that the bobbin thread is exhausted, resulting in empty threading and the need for rework and re-sewing.

[0003] To solve the above problem, the prior art usually adopts a photoelectric sensor set in the frame to detect the remaining amount of the bottom thread. The photoelectric sensor detects the changes in light when the bottom thread passes around the bottom thread shuttle. When the remaining amount of the bottom thread is reduced to a certain extent, the bottom thread will pass through the detection area of ​​the photoelectric sensor, causing a change in light. This change can be captured by the photoelectric sensor and converted into an electrical signal, thereby triggering a corresponding operation or alarm.

[0004] During actual use, since most of the transmission structure of the sewing machine is located inside the frame, certain debris, oil stains and other impurities may be generated during operation. At the same time, the bottom thread is also more likely to produce thread hairs, and the sensing part of the photoelectric sensor is easily affected, resulting in a decrease in the sensing performance of the photoelectric sensor, affecting the accuracy of detection and the life of the photoelectric sensor. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the existing technology and propose a bottom thread detection structure for a sewing machine. The technical problem to be solved by the utility model is: how to ensure the accuracy of bottom thread detection and the life of the photoelectric sensor.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A bottom thread detection structure of a sewing machine, the sewing machine comprises a frame, a bottom thread rotary shuttle is arranged in the frame, the detection structure comprises a photoelectric sensor, and the characteristic is that a sensor support frame is connected to the frame, the sensor support frame has a light guide channel and a sensor mounting hole communicated with the light guide channel, the photoelectric sensor is installed in the sensor mounting hole, the two ends of the light guide channel are respectively opposite to the sensing end of the photoelectric sensor and the bottom thread rotary shuttle, and the sensor support frame is connected to an air inlet nozzle communicated with the light guide channel.

[0008] The light emitted by the photoelectric sensor arranged in the sensor support frame reaches the reflective material of the bottom line shuttle through the light guide channel, and the light reflected by the bottom line shuttle passes through the light guide channel again and is received by the photoelectric sensor. The photoelectric sensor converts the received light signal into an electrical signal and feeds the electrical signal back to the control end to detect the bottom line remaining amount on the bottom line shuttle in real time. When the bottom line remaining amount is insufficient, the control end receives the corresponding electrical signal of the photoelectric sensor and issues an alarm. By arranging the photoelectric sensor in the sensor support frame, the direct exposure of the sensing end of the photoelectric sensor can be avoided. The arrangement of the sensor mounting hole can facilitate the installation of the photoelectric sensor. Through the arrangement of the light guide channel, the sensing end of the photoelectric sensor can form a protection channel, which can block most of the thread hair and impurities on the one hand, and on the other hand, when a small amount of impurities and thread hair enters the light guide channel, gas is blown into the light guide channel through the air inlet nozzle to clean the light guide channel, and the thread hair and impurities in the light guide channel are blown out of the sensor support frame to ensure the cleanliness of the light guide channel, further reduce the influence of impurities on the sensing end of the photoelectric sensor, ensure the accuracy of bottom line detection, and ensure the life of the photoelectric sensor.

[0009] In the above-mentioned bottom thread detection structure of a sewing machine, the photoelectric sensor is positioned in the sensor mounting hole by a bolt, and the sensing end of the photoelectric sensor is in contact with the wall of the sensor mounting hole. Bolts are simple to operate as fixing parts, and are convenient for loading and unloading. The sensing end of the photoelectric sensor is in contact with the wall of the sensor mounting hole, so that the gap between the sensing end of the photoelectric sensor and the sensor mounting hole is reduced, reducing the entry of thread hair, impurities, etc., and ensuring that the photoelectric sensor has a good detection environment.

[0010] In the above-mentioned bottom thread detection structure of a sewing machine, there are two bolts, two bolt insertion holes and two mounting holes corresponding to the two bolt insertion holes are opened on the hole wall of the sensor mounting hole, and the photoelectric sensor has two through holes corresponding to the two bolt insertion holes, and the two bolts pass through the corresponding bolt insertion holes and through holes to be screwed with the corresponding mounting holes. The two bolts increase the connection strength and provide a reliable connection through the cooperation of simple mounting holes, through holes and bolts.

[0011] In the above-mentioned bottom thread detection structure of a sewing machine, the sensor support frame has a supporting portion and a mounting portion, the mounting portion is integrally formed at the lower end of the supporting portion, the mounting portion is in the shape of an elongated strip and faces the bottom thread rotary hook, the light guide channel is arranged on the mounting portion and arranged along the length direction of the mounting portion, the sensor mounting hole is opened on the mounting portion and is perpendicular to the light guide channel, and the sensor mounting hole passes through the side of the mounting portion. Firstly, the sensor mounting hole is perpendicular to the light guide channel so that the photoelectric sensor emits light along the length direction of the light guide channel, thereby avoiding the situation where the light emitted by the photoelectric sensor is attenuated due to reflection in the light guide channel, thereby ensuring the accuracy of the detection data, and secondly, the sensor mounting hole is opened on the mounting portion and passes through the side of the mounting portion, which can ensure the heat dissipation of the photoelectric sensor without affecting the sensing end of the photoelectric sensor.

[0012] In the above-mentioned bottom thread detection structure of a sewing machine, the support portion is bent toward the side with the mounting portion to form a fixing portion, and the fixing portion has two fixing holes for fixing to the frame. The fixing portion and the mounting portion are located on the same side of the support portion, so that the structure of the sensor support frame is approximately C-shaped, which increases the stability of the structure.

[0013] In the above-mentioned bottom thread detection structure of a sewing machine, the peripheral wall of the light guide channel is made of opaque material. Many other components inside the sewing machine are made of reflective metal materials. The peripheral wall of the light guide channel is made of opaque material so that the light reflected by other components cannot enter the light guide channel, thereby reducing the misjudgment of the photoelectric sensor and improving the accuracy and reliability of the detection data.

[0014] Compared with the prior art, the utility model has the following advantages: by arranging the photoelectric sensor in the sensor support frame, the direct exposure of the sensing end of the photoelectric sensor can be avoided, and by setting the light guide channel, the sensing end of the photoelectric sensor can form a protection channel, which can block most of the lint and impurities on the one hand, and on the other hand, when a small amount of impurities and lint enters the light guide channel, the blowing device blows out gas, and the gas is blown into the light guide channel through the air inlet nozzle to clean the light guide channel, and the lint and impurities in the light guide channel are blown out of the sensor support frame to ensure the cleanliness of the light guide channel, further reduce the influence of impurities on the sensing end of the photoelectric sensor, ensure the accuracy of bottom line detection, and ensure the life of the photoelectric sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the partial structure of a sewing machine.

[0016] Figure 2 yes Figure 1 Magnified view of area A.

[0017] Figure 3It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 4 yes Figure 3 Structural breakdown diagram.

[0019] Figure 5 yes Figure 3 Structural cross-section view.

[0020] Figure 6 yes Figure 5 Structural cross-section view from perspective B.

[0021] In the figure, 1, frame; 2, sensor support frame; 21, support part; 22, mounting part; 221, light guide channel; 222, sensor mounting hole; 223, bolt insertion hole; 224, mounting hole; 23, fixing part; 231, fixing hole; 3, bottom line shuttle; 4, air inlet nozzle; 5, photoelectric sensor; 51, through hole; 6, bolt. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to the following embodiments.

[0023] like Figure 1 , Figure 2 As shown, a bottom thread detection structure of a sewing machine, the sewing machine includes a frame 1, a bottom thread shuttle 3 is arranged in the frame 1, the detection structure includes a photoelectric sensor 5 facing the bottom thread shuttle 3, the frame 1 is connected to a sensor support frame 2, the sensor support frame 2 has a light guide channel 221 and a sensor mounting hole 222 communicating with the light guide channel 221, the photoelectric sensor 5 is arranged in the sensor mounting hole 222 and is positioned on the sensor mounting hole 222 by two bolts 6, the two ends of the light guide channel 221 are respectively opposite to the sensing end of the photoelectric sensor 5 and the bottom thread shuttle 3, the sensor support frame 2 is connected to an air inlet nozzle 4 communicating with the light guide channel 221, wherein the peripheral wall of the light guide channel 221 is made of opaque material to prevent light reflected by other metal parts in the sewing machine from entering the light guide channel 221, thereby reducing misjudgment of the photoelectric sensor 5 and improving the accuracy and reliability of detection data.

[0024] Combination Figures 3 to 6The hole wall of the sensor mounting hole 222 is provided with two bolt insertion holes 223 and two mounting holes 224 corresponding to the two bolt insertion holes 223. The photoelectric sensor 5 is provided with two through holes 51 corresponding to the two bolt insertion holes 223. The bolt 6 passes through the corresponding bolt insertion holes 223 and the through holes 51 and is screwed with the corresponding mounting holes 224. The sensing end of the photoelectric sensor 5 fits with the hole wall of the sensor mounting hole 222 to reduce the entry of thread hair, impurities, etc. into the gap, ensuring that the photoelectric sensor 5 has a good detection environment. The sensor support frame 2 has a supporting portion 21, a mounting portion 22 and a fixing portion 23. The mounting portion 22 is integrally formed at the lower end of the supporting portion 21. The mounting portion 22 is in a long strip shape and faces the bottom line rotary hook 3. The supporting portion 21 is bent toward the side with the mounting portion 22 to form the fixing portion 23. The fixing portion 23 has two fixing holes 231 for fixing to the frame 1.

[0025] The above-mentioned light guide channel 221 is arranged on the mounting part 22 and along the length direction of the mounting part 22. In order to avoid the attenuation of the light emitted by the photoelectric sensor 5 in the light guide channel 221 due to reflection and ensure the accuracy of the detection data, the sensor mounting hole 222 is opened on the mounting part 22 and is perpendicular to the light guide channel 221. The sensor mounting hole 222 passes through the side of the mounting part 22 and can ensure the heat dissipation of the photoelectric sensor 5 without affecting the sensing end of the photoelectric sensor 5.

[0026] In the utility model, the light emitted by the photoelectric sensor 5 arranged in the sensor support frame 2 reaches the reflective material of the bottom line shuttle 3 through the light guiding channel 221, and the light reflected by the bottom line shuttle 3 passes through the light guiding channel 221 again and is received by the photoelectric sensor 5. The photoelectric sensor 5 converts the received light signal into an electrical signal and feeds the electrical signal back to the control end to realize real-time detection of the bottom line residue. When the bottom line residue is insufficient, the control end receives the corresponding electrical signal of the photoelectric sensor 5 and issues an alarm. By setting the photoelectric sensor 5 in the sensor support frame 2, direct exposure of the sensing end of the photoelectric sensor 5 can be avoided. By setting the light guide channel 221, the sensing end of the photoelectric sensor 5 can form a protection channel. On the one hand, it can block most of the lint and impurities. On the other hand, when a small amount of impurities and lint enters the light guide channel 221, the blowing device blows out gas, and the gas is blown into the light guide channel 221 through the air inlet nozzle 4 to clean the light guide channel 221. The lint and impurities in the light guide channel 221 are blown out of the sensor support frame 2 to ensure the cleanliness of the light guide channel 221, further reduce the influence of impurities on the sensing end of the photoelectric sensor 5, ensure the accuracy of the bottom line detection, and ensure the life of the photoelectric sensor 5.

[0027] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0028] Although the terms such as frame 1, sensor support frame 2, support part 21, mounting part 22, light guide channel 221, sensor mounting hole 222, bolt insertion hole 223, mounting hole 224, fixing part 23, fixing hole 231, bottom hook 3, air inlet nozzle 4, photoelectric sensor 5, through hole 51, bolt 6 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model. It is contrary to the spirit of the utility model to interpret them as any additional restrictions.

Claims

1. A bottom thread detection structure of a sewing machine, the sewing machine comprising a frame (1), a bottom thread rotary hook (3) being arranged in the frame (1), and the detection structure comprising a photoelectric sensor (5), characterized in that: The frame (1) is connected to a sensor support frame (2), the sensor support frame (2) is provided with a light guide channel (221) and a sensor mounting hole (222) communicating with the light guide channel (221), the photoelectric sensor (5) is mounted in the sensor mounting hole (222), the two ends of the light guide channel (221) are respectively opposite to the sensing end of the photoelectric sensor (5) and the bottom line rotary shuttle (3), and the sensor support frame (2) is connected to an air inlet nozzle (4) communicating with the light guide channel (221).

2. The bottom thread detection structure of a sewing machine according to claim 1, characterized in that: The photoelectric sensor (5) is positioned in the sensor mounting hole (222) by means of a bolt (6), and the sensing end of the photoelectric sensor (5) is in contact with the wall of the sensor mounting hole (222).

3. The bottom thread detection structure of a sewing machine according to claim 2, characterized in that: There are two bolts (6); two bolt insertion holes (223) and two mounting holes (224) corresponding to the two bolt insertion holes (223) are provided on the hole wall of the sensor mounting hole (222); the photoelectric sensor (5) has two through holes (51) corresponding to the two bolt insertion holes (223); the two bolts (6) pass through the corresponding bolt insertion holes (223) and through holes (51) and are screwed to the corresponding mounting holes (224).

4. A bottom thread detection structure for a sewing machine according to claim 2 or 3, characterized in that: The sensor support frame (2) comprises a support portion (21) and a mounting portion (22); the mounting portion (22) is integrally formed at the lower end of the support portion (21); the mounting portion (22) is in the shape of an elongated strip and faces the bottom thread rotary hook (3); the light guide channel (221) is arranged on the mounting portion (22) and along the length direction of the mounting portion (22); the sensor mounting hole (222) is provided on the mounting portion (22) and is perpendicular to the light guide channel (221); and the sensor mounting hole (224) passes through the side of the mounting portion (22).

5. The bottom thread detection structure of a sewing machine according to claim 4, characterized in that: The support portion (21) is bent toward a side having the mounting portion (22) to form a fixing portion (23), and the fixing portion (23) has two fixing holes (231) for fixing to the frame (1).

6. A bottom thread detection structure for a sewing machine according to any one of claims 1 to 3, characterized in that: The peripheral wall of the light guiding channel (221) is made of an opaque material.

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