A thread feeding device for a sewing machine

Abstract

The application discloses a thread releasing device of a sewing machine and relates to the technical field of thread releasing cylinders of sewing machines. The application comprises a sewing machine assembly, which comprises a workbench, a sewing machine body installed on the upper end of the workbench, and a needle installed on the sewing machine body; and a locking assembly, which comprises a bottom plate installed on the upper end of the sewing machine body. The tension assembly can press the tension wheel downward when the thread is released from the thread releasing cylinder, the tension wheel can be lifted upward after the thread releasing is stopped, the thread can be taut, and the thread can be prevented from being excessively loose to cause winding. The magnet in the locking assembly can be bounced upward when the sewing machine stops working, the clamping block at the top can be clamped into the gear, the thread releasing cylinder can be further locked, the thread releasing cylinder can be prevented from continuously rotating due to inertia after the sewing machine stops working, and the winding and knotting of the two thin threads can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of sewing machine thread feeder technology, specifically to a thread feeder device for a sewing machine. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. Sewing machines can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products made of leather, plastic, and paper. The stitches produced are neat, beautiful, flat, and strong. Sewing is fast and easy to use, and it has given rise to art forms such as hand-pushed embroidery and computer embroidery. All kinds of sewing threads for sewing machines are supplied by a thread feeder located on the machine head.

[0003] Publication No. CN 213681198 U discloses a thread feeding device for a sewing machine, including a base plate and a tray. The tray is fixedly connected to the top of the base plate, and a rotating disc is movably connected to the center of the tray. A winding post is fixedly connected to the top of the rotating disc, and a rigid spring is movably connected inside the winding post. A locking buckle is fixedly connected to one side of the rigid spring, and a locking plate is movably connected to the bottom of the base plate. This thread feeding device, through the rotating disc, can effectively rotate the winding post, achieving high-speed rotation of the thread spool. This avoids slow thread feeding on the winding post, improving the thread feeding efficiency and saving working time. The locking buckles limit the movement of the thread spool. The extension and retraction of the rigid spring behind the locking buckles allows the two locking buckles to move left and right, thus locking the thread spool onto the winding post when it is fed in, preventing thread breakage caused by the thread spool moving on the winding post during high-speed thread feeding.

[0004] While the aforementioned device effectively ensures the stability and safety of the thread during use, the thread feed spool may wobble during the feed process. This wobble alters the rotation speed of the feed spool and can easily cause it to fall off the feed rod. Furthermore, due to inertia, the two thread feed spools of the sewing machine are prone to overfeeding, leading to tangling and knotting of the two threads. Therefore, a new technical solution is needed to address these issues. Summary of the Invention

[0005] The purpose of this invention is to provide a thread feeding device for a sewing machine, addressing the problem that while current devices effectively ensure thread stability and safety during use, the thread feeding spool may wobble during feeding. This wobble alters the thread feeding rotation speed and can easily cause the spool to fall off the feeding rod. Furthermore, due to inertia, the two thread spools of the sewing machine are prone to feeding excessive amounts of thread during feeding, leading to tangling and knotting of the two threads.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a thread feeding device for a sewing machine, a sewing machine assembly, the sewing machine assembly including a worktable, a sewing machine body mounted on the upper end of the worktable, and a needle mounted on the sewing machine body; A locking assembly includes a base plate mounted on the upper part of the sewing machine body, a control button on the base plate, two symmetrically mounted rotating seats on the base plate, a first mounting groove opened at the end of each rotating seat near the control button, an electromagnet mounted on the bottom of the inner side wall of each first mounting groove, a magnet mounted on the upper end of the electromagnet, a fixing rod mounted on the upper end of the magnet, a locking block mounted on the upper end of the fixing rod, the fixing rod being installed through the base plate, a gear mounted on the outside of each rotating seat, a data processor mounted between the two rotating seats, an antenna mounted on the data processor, the data processor being connected to the base plate, and a camera mounted on the sewing machine body, the camera being mounted on the side of the needle tip; The tension assembly includes two sets of rotating arms mounted on the upper end of a base plate. Two first bearings are mounted on the inner wall of each set of rotating arms. A tension wheel is installed between each set of first bearings. Two first mounting blocks are symmetrically mounted on the inner wall of each set of rotating arms. A first rotating shaft is installed between the two first mounting blocks. The top ends of each first rotating shaft pass through the corresponding first mounting block, and both ends of each first rotating shaft are connected to the inner wall of the corresponding rotating arm. Second bearings are mounted on the inner wall of each set of rotating arms. A second rotating shaft is installed between each set of second bearings. A second mounting block is mounted on the second rotating shaft. A sleeve is mounted on the side of the second mounting block closest to the base plate. A second mounting groove is formed inside the sleeve. A first spring is installed in the second mounting groove. A second telescopic rod is mounted on one end of the first spring. The end of the first spring away from the second telescopic rod is fixedly connected to the top end of the inner wall of the sleeve.

[0007] In a preferred embodiment of the present invention, a support base is installed on the upper end of each of the rotating seats, and an installation cylinder is installed on the other end of each support base away from the base plate. A third installation groove is provided inside the installation cylinder, and a third telescopic rod is installed in the third installation groove. A force-applying plate is installed at the top end of the third telescopic rod, and a second spring is fixedly installed on one end of the force-applying plate. The end of the second spring away from the force-applying plate is fixedly connected to the installation cylinder. An inclined groove is provided on the portion of the third telescopic rod at the inner end of the installation cylinder, and a connecting block is installed on the inclined groove. A telescopic plate is installed on the end of the connecting block away from the third telescopic rod, and the telescopic rod is connected to one side of the installation cylinder.

[0008] In a preferred embodiment of the present invention, a rubber pad is fixedly installed on the side of the telescopic plate away from the mounting cylinder, and the rubber pad is arc-shaped.

[0009] In a preferred embodiment of the present invention, a fourth mounting groove is provided on the mounting cylinder, a baffle is installed in the fourth mounting groove, a third spring is installed on one side of the baffle, and the side of the third spring away from the baffle is fixedly connected to the side of the fourth mounting groove near the inclined groove.

[0010] In a preferred embodiment of the present invention, the output end of the camera is connected to the input end of the data processor, the output end of the data processor is connected to the input end of the electromagnet, and the output end of the control button is connected to the input end of the electromagnet.

[0011] In a preferred embodiment of the present invention, the width of the card block is less than the width between any two teeth on the gear, the end of the gear away from the base plate is connected to the end of the support plate near the base plate, and the inner diameter of the gear is greater than the outer diameter of the rotating seat.

[0012] In a preferred embodiment of the present invention, threaded holes are provided through the four corners of the upper end of the base plate, and a bolt is installed at the upper end of any one of the threaded holes, and any one of the bolts is engaged with the corresponding threaded hole.

[0013] In a preferred embodiment of the present invention, the threaded holes on the base plate are all formed on the sewing machine body, and the threaded holes on the sewing machine body are engaged with bolts.

[0014] In a preferred embodiment of the present invention, the tension wheel has a groove, and the surface of the groove is made of rubber.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes a tension assembly that presses the tension wheel downwards during thread feeding from the thread spool. After feeding stops, the tension wheel rises, tightening the thread and preventing it from becoming too loose and tangling. Simultaneously, the magnet in the locking assembly springs upwards when the sewing machine stops, engaging the top latch into the gear to further lock the thread spool. This prevents the spool from continuing to rotate and feed thread due to its own inertia after the sewing machine stops, effectively avoiding tangling and knotting of the two threads.

[0016] This invention, through its installation components, particularly the installation cylinder and telescopic plate, can be used to install various sizes of pay-off cylinders, making it widely adaptable and highly practical. Attached Figure Description

[0017] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is the front view of the present invention; Figure 2 This is a cross-sectional view of the locking component of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0018] Figure 4 This is a structural diagram of the tension assembly of the present invention; Figure 5 This is a cross-sectional view of the sleeve of the present invention; Figure 6 This is a cross-sectional view of the mounting cylinder of the present invention; Figure 7 For the present invention Figure 6 Enlarged view at point B in the middle; Figure 8 For the present invention Figure 1 Enlarged view at point C; Figure 9 This is a system block diagram of the present invention.

[0019] In the diagram: 100, Locking assembly; 110, Base plate; 120, Camera; 130, Control button; 140, Data processor; 141, Antenna; 150, Rotating base; 160, Gear; 170, First mounting slot; 171, Magnet; 172, Electromagnet; 173, Fixing rod; 174, Locking block; 200, Tension assembly; 210, Rotating arm; 220, First bearing; 230, Tension wheel; 240, First mounting block; 250, First rotating shaft; 260, Second bearing; 270, Second rotating shaft; 280, Second mounting block; 29 0. Sleeve; 291. Second mounting slot; 292. First spring; 293. Second telescopic rod; 310. Mounting cylinder; 320. Third mounting slot; 330. Third telescopic rod; 331. Inclined groove; 340. Force plate; 350. Second spring; 360. Support base; 370. Connecting block; 371. Telescopic plate; 372. Rubber pad; 380. Fourth mounting slot; 381. Baffle; 382. Third spring; 400. Sewing machine assembly; 410. Worktable; 420. Sewing machine body; 430. Needle; 510. Threaded hole; 520. Bolt. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.

[0022] Example 1: A thread feeding device for a sewing machine, see [link to example]. Figures 1 to 8 The sewing machine assembly 400 includes a worktable 410, a sewing machine body 420 mounted on the upper end of the worktable 410, and a needle 430 mounted on the sewing machine body 420. A locking assembly 100 includes a base plate 110 mounted on the upper end of a sewing machine body 420. A control button 130 is mounted on the base plate 110. Two rotating seats 150 are symmetrically mounted on the base plate 110. Each rotating seat 150 has a first mounting groove 170 at its end near the control button 130. An electromagnet 172 is mounted on the bottom of the inner sidewall of each first mounting groove 170. A magnet 171 is mounted on the upper end of the electromagnet 172. A [missing information - likely a type of magnet] is mounted on the upper end of the magnet 171. A fixing rod 173 is provided, with a locking block 174 installed at its upper end. The fixing rod 173 is installed through the base plate 110. A gear 160 is installed on the outside of any one of the rotating seats 150. A data processor 140 is installed between the two rotating seats 150. An antenna 141 is installed on the data processor 140. The data processor 140 is connected to the base plate 110. A camera 120 is installed on the sewing machine body 420 and is installed on one side of the needle 430. Tension assembly 200 includes two sets of rotating arms 210 mounted on the upper end of base plate 110. Two first bearings 220 are mounted on the inner wall of each set of rotating arms 210. A tension wheel 230 is installed between each set of first bearings 220. Two first mounting blocks 240 are symmetrically mounted on the inner wall of each set of rotating arms 210. A first rotating shaft 250 is installed between the two first mounting blocks 240. The top ends of each first rotating shaft 250 penetrate the corresponding first mounting block 240, and both ends of each first rotating shaft 250 are connected to the inner wall of the corresponding rotating arm 210. A second bearing 260 is mounted on the inner wall of each set of rotating arms 210. A second rotating shaft 270 is installed between the two bearings 260. A second mounting block 280 is installed on the second rotating shaft 270. A sleeve 290 is installed on the side of the second mounting block 280 near the base plate 110. A second mounting groove 291 is formed inside the sleeve 290. A first spring 292 is installed in the second mounting groove 291. A second telescopic rod 293 is installed at one end of the first spring 292. The end of the first spring 292 away from the second telescopic rod 293 is fixedly connected to the top of the inner side wall of the sleeve 290. The output end of the camera 120 is connected to the input end of the data processor 140. The output end of the data processor is connected to the input end of the electromagnet 172. The output end of the control button 130 is connected to the input end of the electromagnet 172. The tension wheel 230 is connected to the inlet end and has a groove with a rubber surface. During operation, the wire feeding spool is first installed on the mounting cylinder 310, and then wound around the tension wheel 230 to feed the wire. Simultaneously, the camera 120 transmits the real-time monitored image information to the data processor 140 for analysis. When the video information of the needle 430 stopping operation is transmitted to the data processor 140, the data processor 140 generates a power-on command to close the control button 130, thereby energizing the electromagnet 172. The electromagnet 172 generates magnetism when energized. Since the opposite ends of the electromagnet 172 and the magnet 171 have the same magnetic poles, the magnet 171 moves upwards. As the magnet 171 moves upwards, it drives the fixing rod 173 and... The locking block 174 at the top of the fixed rod 173 moves upward. After moving a certain distance, the locking block 174 enters between the corresponding two teeth on the gear 160, stopping the gear 160. When the gear 160 stops, it will cause the support base 360 ​​above to stop rotating. The feed spool on the support base 360 ​​will also stop rotating to prevent overfeeding due to its own physical characteristics. When the sewing machine needs to start working, since the control button 130 is electrically connected to the electromagnet 172, the operator can directly press the control button 130 to de-energize the electromagnet 172. As a result, the magnet 171 falls downward due to its own weight. When the locking block 174 leaves between the teeth on the gear 160, the gear 160 loses the resistance to engagement.At this point, the mounting cylinder 310 can rotate along with the rotating seat 150 at the bottom. The feed cylinder on the mounting assembly will also rotate normally. During normal feed, the line passes over the upper end of the tension wheel 230. When the needle 430 applies tension to the line, it presses the tension wheel 230 downwards. As the tension wheel 230 moves downwards, the entire tension assembly 200 tilts outwards around the first rotating shaft 250 at the bottom, compressing the first spring 292 at the inner end and shortening its stroke. Subsequently, when the needle 430 loses its pulling force on the line, the sleeve 290 loses pressure. Because the first spring 292 releases pressure, it lifts the sleeve 290 upwards. The sleeve 290 then rotates the entire tension assembly 200 upwards around the first rotating shaft 250 via the second mounting block 280 at the top, simultaneously lifting the line upwards, keeping the line taut at all times.

[0023] Each of the rotating seats 150 is equipped with a support seat 360 at its upper end. Each support seat 360 has a mounting cylinder 310 at its other end away from the base plate 110. A third mounting groove 320 is formed inside the mounting cylinder 310, and a third telescopic rod 330 is installed within the third mounting groove 320. A force-applying plate 340 is installed at the top of the third telescopic rod 330. A second spring 350 is fixedly installed at one end of the force-applying plate 340, and the end of the second spring 350 away from the force-applying plate 340 is fixedly connected to the mounting cylinder 310. An inclined groove 331 is formed on the portion of the third telescopic rod 330 located inside the mounting cylinder 310. A connecting block 370 is installed on the mounting cylinder 31. A telescopic plate 371 is installed on the end of the connecting block 370 away from the third telescopic rod 330. The telescopic rod is connected to one side of the mounting cylinder 310. A rubber pad 372 is fixedly installed on the side of the telescopic plate 371 away from the mounting cylinder 310. The rubber pad 372 is arc-shaped. A fourth mounting groove 380 is opened on the mounting cylinder 310. A baffle 381 is installed in the fourth mounting groove 380. A third spring 382 is installed on one side of the baffle 381. The side of the third spring 382 away from the baffle 381 is fixedly connected to the side of the fourth mounting groove 380 near the inclined groove 331. The width of the locking block 174 is smaller than that of the gear 16. The width between any two teeth on 0, the end of the gear 160 away from the base plate 110 is connected to the end of the support plate near the base plate 110, the inner diameter of the gear 160 is larger than the outer diameter of the rotating seat 150, during operation, the force plate 340 is first pressed down, the force plate 340 moves down and drives the third telescopic rod 330 at the bottom to move down, the inclined groove 331 on the third telescopic rod 330 also moves down when the third telescopic rod 330 moves down, the lateral depth of the inclined groove 331 will continue to increase when it moves down, the telescopic plate 371 at the left end will move inward under the push of the third spring 382, ​​when the telescopic plate 371 is on the outside When the distance is shortened to a certain extent, the wire-feeding spool can be slipped onto the mounting spool 310. Then, the force plate 340 is released. When the second spring 350 at the bottom of the force plate 340 loses pressure, it will drive the third telescopic rod 330 to move upward through the force plate 340 due to its own physical properties. After the third telescopic rod 330 moves upward, its inclined groove 331 will also move synchronously. When the inclined groove 331 moves upward, its depth will continue to decrease, squeezing the telescopic plate 371 at the left end outward and pressing the wire-feeding spool at the outer end tightly. The rubber pad 372 at the top of the outer side of the telescopic plate 371 will increase the friction with the inner wall of the wire-feeding spool, so that the wire-feeding spool will not slip.

[0024] As a further embodiment of the present invention, threaded holes 510 are provided through the four corners of the upper end of the base plate 110. A bolt 520 is installed on the upper end of any one of the threaded holes 510. Each bolt 520 is engaged with the corresponding threaded hole 510. The threaded holes 510 on the base plate 110 are all opened to the sewing machine body 420. The threaded holes 510 on the sewing machine body 420 are engaged with the bolts 520. During installation, the four threaded holes 510 on the base plate 110 are directly aligned with the four threaded holes 510 on the sewing machine, and then the four bolts 520 are tightened into the threaded holes 510. This allows the base plate 110 and the device on the base plate 110 to be stably connected to the sewing machine.

[0025] Working principle: During installation, align the four threaded holes 510 on the base plate 110 with the four threaded holes 510 on the sewing machine, and then tighten the four bolts 520 into the threaded holes 510. This will stably connect the base plate 110 and the device on it to the sewing machine. Next, press the force plate 340 downwards. As the force plate 340 moves downwards, it drives the third telescopic rod 330 at the bottom to move downwards. As the third telescopic rod 330 moves downwards, the inclined groove 331 on it also moves downwards. The lateral depth of the inclined groove 331 increases continuously as it moves downwards. The telescopic plate 371 at the left end will be pushed by the third spring 382... The telescopic plate 371 moves inward. When the distance between the telescopic plate 371 and the outside is shortened to a certain extent, the wire-feeding drum can be put on the mounting drum 310. Then, the force plate 340 is released. When the second spring 350 at the bottom of the force plate 340 loses pressure, it will drive the third telescopic rod 330 to move upward through the force plate 340 due to its own physical properties. After the third telescopic rod 330 moves upward, its inclined groove 331 will also move synchronously. When the inclined groove 331 moves upward, its depth will continue to decrease, squeezing the telescopic plate 371 at the left end outward and pressing the wire-feeding drum at the outside end tightly. The rubber pad 372 at the top of the outer side of the telescopic plate 371 will increase the friction with the inner wall of the wire-feeding drum, so that the wire-feeding drum will not slip.The wire feeding spool is then installed on the mounting spool 310, and then wound around the tension wheel 230 to feed the wire. Simultaneously, the camera 120 transmits the real-time monitored video information to the data processor 140 for analysis. When the video information of the needle 430 stopping operation is transmitted to the data processor 140, the data processor 140 generates an energizing command to close the control button 130, thereby energizing the electromagnet 172. The electromagnet 172 generates magnetism when energized. Since the opposite ends of the electromagnet 172 and the magnet 171 have the same magnetic poles, the magnet 171 will then move upwards. When the magnet 171 moves upward, it drives the fixed rod 173 and the locking block 174 at the top of the fixed rod 173 to move upward. After moving a certain distance, the locking block 174 will enter between the corresponding two teeth on the gear 160 and stop the gear 160. When the gear 160 stops, it will drive the upper support 360 to stop rotating, and the feed spool on the support 360 will also stop rotating to prevent overfeeding due to its own physical characteristics. When the sewing machine needs to start working, the control button 130 is electrically connected to the electromagnet 172. Upon connection, the operator directly presses control button 130 to de-energize electromagnet 172, causing magnet 171 to fall downwards due to its own weight. When the locking block 174 disengages from the teeth on gear 160, gear 160 loses its engaging resistance. At this point, mounting cylinder 310 can rotate with the rotating base 150 at the bottom. The feed drum on the further mounting assembly will also rotate normally. During normal feed, the line passes over the upper end of tension wheel 230. When needle 430 applies a pulling force to the line, it presses tension wheel 230 downwards. During downward movement, the entire tension assembly 200 tilts outward around the first rotation axis 250 at the bottom, compressing the first spring 292 at the inner end and shortening its stroke. Subsequently, when the needle 430 loses its pulling force on the thread, the sleeve 290 loses pressure. As the first spring 292 releases its pressure, it pushes the sleeve 290 upward. The sleeve 290 then rotates the entire tension assembly 200 upward around the first rotation axis 250 via the second mounting block 280 at the top, simultaneously pushing the thread upward, ensuring the thread remains taut.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A thread feeding device for a sewing machine, characterized in that, include: A sewing machine assembly (400) includes a worktable (410), a sewing machine body (420) is mounted on the upper end of the worktable (410), and a needle (430) is mounted on the sewing machine body (420). A locking assembly (100) includes a base plate (110) mounted on the upper end of the sewing machine body (420), a control button (130) on the base plate (110), and two symmetrically mounted rotating seats (150) on the base plate (110). A first mounting groove (170) is provided at the end of each rotating seat (150) near the control button (130). An electromagnet (172) is mounted at the bottom of the inner wall of each of the first mounting grooves (170). A magnet (171) is mounted on the upper end of the electromagnet (172), and a fixed... A fixed rod (173) is provided, and a locking block (174) is installed on the upper end of the fixed rod (173). The fixed rod (173) is installed through the base plate (110). A gear (160) is installed on the outside of any one of the rotating seats (150). A data processor (140) is installed between the two rotating seats (150). An antenna (141) is installed on the data processor (140). The data processor (140) is connected to the base plate (110). A camera (120) is installed on the sewing machine body (420). The camera (120) is installed on one side of the needle (430). Tension assembly (200) includes two sets of rotating arms (210) mounted on the upper end of base plate (110). Two first bearings (220) are mounted on the inner wall of each set of rotating arms (210). Tension wheels (230) are mounted between each set of first bearings (220). Two first mounting blocks (240) are symmetrically mounted on the inner wall of each set of rotating arms (210). A first rotating shaft (250) is mounted between the two first mounting blocks (240). The top ends of each first rotating shaft (250) penetrate the corresponding first mounting block (240), and both ends of each first rotating shaft (250) are connected to the inner wall of the corresponding rotating arm (210). Connected, a second bearing (260) is installed on the inner wall of any group of rotating arms (210), and a second rotating shaft (270) is installed between any group of second bearings (260). A second mounting block (280) is installed on the second rotating shaft (270). A sleeve (290) is installed on the side of the second mounting block (280) near the base plate (110). A second mounting groove (291) is opened in the sleeve (290). A first spring (292) is installed in the second mounting groove (291). A second telescopic rod (293) is installed at one end of the first spring (292). The end of the first spring (292) away from the second telescopic rod (293) is fixedly connected to the top of the inner wall of the sleeve (290).

2. The thread feeding device for a sewing machine according to claim 1, characterized in that: Each of the rotating seats (150) is equipped with a support seat (360) at its upper end. Each of the support seats (360) has an mounting cylinder (310) at its other end away from the base plate (110). A third mounting groove (320) is provided inside the mounting cylinder (310). A third telescopic rod (330) is installed inside the third mounting groove (320). A force-applying plate (340) is installed at the top of the third telescopic rod (330). One end of the force-applying plate (340) is fixedly mounted with… The second spring (350) is fixedly connected to the mounting cylinder (310) at one end away from the force plate (340). The third telescopic rod (330) has a groove (331) on the part of the inner end of the mounting cylinder (310). A connecting block (370) is installed on the groove (331). A telescopic plate (371) is installed on the end of the connecting block (370) away from the third telescopic rod (330). The telescopic rod is connected to one side of the mounting cylinder (310).

3. The thread feeding device for a sewing machine according to claim 2, characterized in that: A rubber pad (372) is fixedly installed on the side of the telescopic plate (371) away from the mounting cylinder (310), and the rubber pad (372) is arc-shaped.

4. The thread feeding device for a sewing machine according to claim 2, characterized in that: The mounting cylinder (310) is provided with a fourth mounting groove (380), and a baffle (381) is installed in the fourth mounting groove (380). A third spring (382) is installed on one side of the baffle (381), and the side of the third spring (382) away from the baffle (381) is fixedly connected to the side of the fourth mounting groove (380) near the inclined groove (331).

5. The thread feeding device for a sewing machine according to claim 1, characterized in that: The output of the camera (120) is connected to the input of the data processor (140), the output of the data processor is connected to the input of the electromagnet (172), and the output of the control button (130) is connected to the input of the electromagnet (172).

6. The thread feeding device for a sewing machine according to claim 1, characterized in that: The width of the card block (174) is less than the width between any two teeth on the gear (160). The end of the gear (160) away from the base plate (110) is connected to the end of the support plate near the base plate (110). The inner diameter of the gear (160) is greater than the outer diameter of the rotating seat (150).

7. The thread feeding device for a sewing machine according to claim 1, characterized in that: The base plate (110) has threaded holes (510) through each of its four corners. Each threaded hole (510) has a bolt (520) installed on its upper end. Each bolt (520) is engaged with the corresponding threaded hole (510).

8. The thread feeding device for a sewing machine according to claim 7, characterized in that: The threaded holes (510) on the base plate (110) are all opened onto the sewing machine body (420), and the threaded holes (510) on the sewing machine body (420) are engaged with the bolts (520).

9. The thread feeding device for a sewing machine according to claim 1, characterized in that: The tension wheel (230) has a groove, and the surface of the groove is made of rubber.

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