Industrial sewing machine

Abstract

The utility model belongs to the technical field of industrial sewing machines, and particularly relates to an industrial sewing machine. The sewing machine body is arranged on the workbench and located on the other side of the workbench; the mounting frame is arranged on the workbench, and a limiting cylinder used for winding a sewing thread is arranged in the middle of the mounting frame; the placing structure is arranged at the top of the mounting frame and is used for sleeving and fixing the bobbin; wherein the placing structure comprises a sleeving assembly and a fastening assembly, and the fastening assembly is arranged to be capable of gradually expanding the sleeving assembly when the fastening assembly is gradually screwed. The placement structure has the beneficial effects that the sleeving assembly and the fastening assembly are combined, and the fastening assembly is designed to be capable of pushing the sleeving assembly to be gradually expanded in the gradual screwing process, so that the sleeving assembly is tightly attached to the inner wall of the bobbin. By means of the design, the installation process is simplified, stable installation of the bobbin can be achieved by directly screwing the fastening assembly, the installation efficiency is greatly improved, and operation steps are reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of industrial sewing machines, and particularly relates to an industrial sewing machine. BACKGROUND

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on a workpiece, so as to interweave or sew one or more layers of the workpiece. An industrial sewing machine is a sewing machine suitable for sewing workpieces in large quantities in a sewing factory or other industrial departments. Garment, hat and shoe factories that need to use a sewing machine are all equipped with an industrial sewing machine.

[0003] Patent No. CN221071854U discloses an industrial sewing machine, which comprises a workbench and a sewing machine body.

[0004] The above patent can be fitted with the inner wall of the thread cylinder by setting the limiting plate and the second spring, so as to avoid falling when the thread cylinder shakes. However, since the spring is used, the limiting ring needs to be loosened, the limiting plate needs to be pressed inward, the thread cylinder needs to be sleeved, the limiting ring needs to be tightened, and the process is relatively complicated and needs to be improved. SUMMARY

[0005] The application aims to provide an industrial sewing machine which can solve the above problems.

[0006] The application aims to provide an industrial sewing machine, which comprises:

[0007] a workbench;

[0008] a sewing machine body arranged on the workbench and located on the other side of the workbench;

[0009] a mounting frame arranged on the workbench and having a limiting cylinder body in the middle for winding the sewing thread;

[0010] a placing structure arranged on the top of the mounting frame and used for sleeving and fixing the thread cylinder;

[0011] The placing structure comprises a sleeving assembly and a fastening assembly, and the fastening assembly is arranged to be gradually expanded when the sleeving assembly is gradually tightened.

[0012] The placing structure of the industrial sewing machine is combined with the sleeving assembly and the fastening assembly, wherein the fastening assembly is designed to push the sleeving assembly to gradually expand during the process of gradually screwing, so as to tightly fit the inner wall of the bobbin. This design not only simplifies the installation process, but also eliminates the spring and optimizes the structure.

[0013] In addition, since the sleeving assembly can tightly fit the inner wall of the bobbin, even if the bobbin shakes during work, it can effectively prevent the bobbin from falling off, ensuring the continuity and stability of the sewing operation.

[0014] Further, the sleeving assembly comprises:

[0015] A positioning rod, one end of which is arranged on the mounting frame, and the other end of which is provided with a threaded segment;

[0016] An expanding sleeve, comprising a plurality of expanding leaves, the diameters of the two ends of the expanding leaves gradually decrease from outside to inside;

[0017] A matching structure, comprising a sliding rod arranged on the inner wall of each expanding leaf, and a sliding groove arranged on the positioning rod and matched with the sliding rod;

[0018] Wherein, the expanding leaves are fan-shaped, and a plurality of expanding leaves can be spliced to form a circular ring.

[0019] The fastening assembly can push the expanding sleeve to gradually expand during the process of screwing, so as to tightly fit and fix the bobbin. The sleeving assembly mainly comprises a positioning rod, an expanding sleeve and a matching structure. One end of the positioning rod is mounted on the mounting frame as the fixed point of the entire sleeving assembly, and the other end is provided with a threaded segment which is matched with the fastening assembly. The expanding sleeve is composed of a plurality of expanding leaves, the cross section of the expanding leaf is fan-shaped, and the diameters of the two ends gradually decrease from outside to inside. When the expanding leaves are not expanded, they can be spliced to form a circular ring, and after expansion, they can adapt to bobbins of different diameters. The matching structure is the key to connecting the positioning rod and the expanding sleeve. A sliding rod is arranged on the inner wall of each expanding leaf, and a sliding groove matched with the sliding rod is arranged on the positioning rod. When the fastening assembly rotates and the threaded segment moves gradually, the expanding leaves will gradually expand outward, and the expanding leaves will not be separated from the positioning rod under the cooperation of the sliding groove and the sliding rod. It ensures that the expanding sleeve can expand smoothly and uniformly, so as to realize the tight fixing of the bobbin.

[0020] The setting of the sleeving assembly makes the user only need to rotate the fastening assembly, which can push the expanding sleeve to gradually expand through the matching structure, so as to tightly fit and fix the bobbin, simplifying the installation process and improving the work efficiency.

[0021] Further, the fastening assembly comprises:

[0022] a positioning ring;

[0023] a first expansion head disposed on the positioning ring, which gradually increases in diameter from one end connected to the positioning ring to the other end;

[0024] wherein the positioning ring and the first expansion head are both provided with a threaded hole in the center that is adapted to the threaded segment of the positioning rod, when the positioning ring and the positioning rod are gradually tightened, the first expansion head gradually expands the expansion sleeve, and the outer wall of the expansion sleeve is tightly fitted with the inner wall of the bobbin.

[0025] The positioning ring is provided with a threaded hole in the center, which is completely adapted to the threaded segment of the positioning rod. By rotating the positioning ring, the user can adjust the relative position between the positioning ring and the positioning rod. The first expansion head is fixed on the positioning ring, and its shape is designed to gradually increase in diameter from one end connected to the positioning ring to the other end. This tapered design allows the first expansion head to push the expansion sleeve outward when the positioning ring and the positioning rod are gradually tightened, like a wedge.

[0026] At the same time, the threaded holes in the center of the positioning ring and the first expansion head are both adapted to the threaded segment of the positioning rod, and the threaded connection not only provides strong fastening force, but also allows the user to adjust the fastening degree by rotating. When the positioning ring is tightened, the first expansion head will gradually move along the threaded direction and push the expansion sleeve outward until the outer wall of the expansion sleeve is tightly fitted with the inner wall of the bobbin. This expansion mechanism ensures that the bobbin can be tightly and uniformly fixed, and even if there is a slight movement during sewing, it can still maintain stability.

[0027] The arrangement of the fastening assembly realizes the quick and stable installation of the bobbin. The user only needs to rotate the positioning ring, and through the threaded connection and the pushing action of the first expansion head, the expansion sleeve can be gradually expanded and tightly fitted with the inner wall of the bobbin. This not only simplifies the installation process and improves work efficiency, but also enhances the stability and reliability of the equipment.

[0028] Further, the end of the positioning rod away from the positioning ring is provided with a second expansion head, which has the same structure as the first expansion head and is used to cooperate with the end of the expansion sleeve away from the first expansion head.

[0029] The second expansion head has the same structure as the first expansion head, both of which have a tapered design with gradually increasing diameter from one end to the other end. This consistency ensures that whether it is the one end or the other end of the positioning rod, it can push the expansion sleeve to expand in the same way.

[0030] The second expansion head is designed to cooperate with the expansion sleeve away from the end of the first expansion head. When the positioning rod is tightened, the second expansion head will gradually move along the threaded direction like the first expansion head, and push the other end of the expansion sleeve to expand outward. This bidirectional expansion mechanism ensures that the expansion sleeve can uniformly and stably fit on the inner wall of the bobbin, thereby improving the reliability and stability of the fixation.

[0031] Further, the bottom of the sliding rod is provided with a limiting head, the limiting head is in sliding cooperation with the sliding groove, and a sealing ring is arranged at the opening of the top of the sliding groove.

[0032] The limiting head is arranged at the bottom of the sliding rod, and the shape and size thereof can be tightly matched with the sliding groove, so that the sliding rod can stably slide in the sliding groove. The existence of the limiting head not only enhances the connection strength between the sliding rod and the sliding groove, but also prevents the sliding rod from accidentally falling out of the sliding groove under the action of external force. The installation of the sealing ring can prevent dust, dirt or other impurities from entering the inside of the sliding groove, so as to keep the sliding groove clean and lubricated, and prolong the service life of the sliding rod and the sliding groove.

[0033] Further, the workbench is further connected with a dust collection fan away from the sewing machine body, the air inlet of the dust collection fan is connected with an air duct, and one end of the air duct is fixedly connected with a dust collection cover.

[0034] In the design of the industrial sewing machine, in order to improve the working environment and reduce the influence of dust and debris on the sewing operation, the dust collection fan is connected to the side of the workbench away from the sewing machine body, which can improve the cleanliness of the working environment and help to protect the precision components inside the sewing machine from dust erosion.

[0035] The dust collection fan is responsible for generating strong suction force to suck the dust, debris and other impurities in the working area into the dust collection system. Through the continuous work of the dust collection fan, the working area can be kept clean, and the interference of dust on the sewing operation and the internal components of the sewing machine can be reduced. The air duct is used to connect the air inlet of the dust collection fan and the dust collection cover, one end of the air duct is fixedly connected to the air inlet of the dust collection fan, and the other end is connected to the dust collection cover, forming a complete dust collection channel. The opening of the dust collection cover is provided with a grid or screen to prevent larger impurities from entering the dust collection system and causing blockage or damage.

[0036] Through the cooperative work of the dust collection fan, the air duct and the dust collection cover, a high-efficiency dust collection system is formed to quickly suck and discharge the dust and debris in the working area.

[0037] The beneficial effects of the present application are:

[0038] 1. The placement structure of the present application combines a sleeving assembly and a fastening assembly, wherein the fastening assembly is designed to gradually expand the sleeving assembly during the process of gradually tightening, so as to tightly fit the inner wall of the bobbin. This design not only simplifies the installation process, but also directly realizes the stable installation of the bobbin by tightening the fastening assembly, greatly improving the installation efficiency and reducing the operation steps, while also eliminating the spring and optimizing the structure.

[0039] 2. Since the sleeving assembly can tightly fit the inner wall of the bobbin, even if the bobbin shakes during work, it can effectively prevent falling and ensure the continuity and stability of the sewing operation.

[0040] 3. When the positioning rod is tightened, the second expansion head will gradually move along the thread direction like the first expansion head, and push the other end of the expansion sleeve to expand outward. This bidirectional expansion mechanism ensures that the expansion sleeve can uniformly and stably fit on the inner wall of the bobbin, thereby improving the reliability and stability of the fixation. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of the present application;

[0042] Figure 2 is a structural schematic diagram of the placement structure of the present application;

[0043] Figure 3 is a structural schematic diagram of the internal structure of the placement structure of the present application.

[0044] The reference signs in the drawings are: 100, workbench; 200, sewing machine body; 300, mounting frame; 310, limiting cylinder; 400, sleeving assembly; 410, positioning rod; 411, threaded section; 420, expansion sleeve; 421, expansion leaf; 430, matching structure; 431, sliding rod; 432, sliding groove; 433, limiting head; 434, sealing ring; 500, fastening assembly; 510, positioning ring; 520, first expansion head; 530, second expansion head; 600, dust collection fan; 610, air duct; 620, dust collection cover. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0046] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the objects before and after are in a "or" relationship.

[0047] The industrial sewing machine provided by the embodiments of the present application will be described in detail below in combination with the drawings, through specific embodiments and application scenarios.

[0048] Embodiment 1:

[0049] As shown in the drawings, Figure 1 the embodiments of the present application provide an industrial sewing machine, comprising:

[0050] a workbench 100;

[0051] a sewing machine body 200 arranged on the workbench 100 and located on the other side of the workbench 100;

[0052] a mounting bracket 300 arranged on the workbench 100, and a limiting cylinder 310 for winding sewing thread is arranged in the middle part of the mounting bracket 300;

[0053] a placing structure arranged on the top of the mounting bracket 300, for sleeving and fixing the thread cylinder;

[0054] The placing structure includes a sleeving assembly 400 and a fastening assembly 500, and the fastening assembly 500 is arranged to gradually expand the sleeving assembly 400 when gradually tightened.

[0055] In some embodiments of the present application, Figure 1 as shown, an industrial sewing machine is used, and the placing structure of the present application combines the sleeving assembly 400 and the fastening assembly 500, wherein the fastening assembly 500 is designed to gradually expand the sleeving assembly 400 during the process of gradually tightening, so as to tightly fit the inner wall of the thread cylinder. This design not only simplifies the installation process, but also eliminates the need to loosen the limiting ring, press the limiting plate, sleeve the thread cylinder and finally tighten the limiting ring as in the traditional way, but directly through the tightening of the fastening assembly 500 to realize the stable installation of the thread cylinder, which greatly improves the installation efficiency, reduces the operation steps, and also eliminates the spring, optimizing the structure.

[0056] In addition, since the sleeving assembly 400 can closely fit the inner wall of the bobbin, even if the bobbin shakes during operation, it can effectively prevent falling and ensure the continuity and stability of the sewing operation.

[0057] Embodiment 2:

[0058] The embodiment of the application provides an industrial sewing machine, in addition to comprising the above technical features, the industrial sewing machine of the embodiment of the application further comprises the following technical features.

[0059] As shown in the figure, the sleeving assembly 400 comprises:

[0060] The positioning rod 410 is provided at one end on the mounting frame 300 and provided at the other end with a threaded segment 411;

[0061] The expansion sleeve 420 comprises a plurality of expansion leaves 421, and the diameters of the two ends of the expansion leaves 421 gradually decrease from outside to inside;

[0062] The matching structure 430 comprises a sliding rod 431 provided on the inner wall of each expansion leaf 421 and a sliding groove 432 provided on the positioning rod 410 and matched with the sliding rod 431;

[0063] The expansion leaves 421 are in the shape of a sector, and the plurality of expansion leaves 421 can be spliced to form a circular ring.

[0064] In the embodiment of the application, the fastening assembly 500 can push the expansion sleeve 420 during the screwing process, so that the expansion sleeve 420 is gradually expanded to closely fit and fix the bobbin. The sleeving assembly 400 mainly comprises the positioning rod 410, the expansion sleeve 420 and the matching structure 430. One end of the positioning rod 410 is mounted on the mounting frame 300 as the fixing point of the entire sleeving assembly 400, and the other end is provided with a threaded segment 411 which is matched with the fastening assembly 500. The expansion sleeve 420 is composed of a plurality of expansion leaves 421, the cross section of the expansion leaves 421 is in the shape of a sector, and the diameters of the two ends gradually decrease from outside to inside. When the expansion leaves 421 are not expanded, they can be spliced to form a circular ring, and after expansion, they can adapt to bobbins of different diameters. The matching structure 430 is the key to connecting the positioning rod 410 and the expansion sleeve 420. The inner wall of each expansion leaf 421 is provided with a sliding rod 431, and the positioning rod 410 is provided with a sliding groove 432 matched with the sliding rods 431. When the fastening assembly 500 rotates and the threaded segment 411 gradually moves, the expansion leaves 421 will gradually expand outward, and the expansion leaves 421 will not be separated from the positioning rod 410 under the cooperation of the sliding groove 432 and the sliding rod 431. It is ensured that the expansion sleeve 420 can be stably and uniformly expanded, so as to realize the close fixing of the bobbin.

[0065] The setting of the sleeve assembly 400 enables the user to rotate the fastening assembly 500 to gradually expand the extension sleeve 420 by the matching structure 430 to tightly fit and fix the bobbin, simplifying the installation process and improving work efficiency.

[0066] Moreover, the bottom of the sliding rod 431 is provided with a limiting head 433, the limiting head 433 is in sliding cooperation with the sliding groove 432, and the opening at the top of the sliding groove 432 is provided with a sealing ring 434.

[0067] In some embodiments of the present application, the limiting head 433 is arranged at the bottom of the sliding rod 431, and the shape and size of the limiting head 433 can be tightly matched with the sliding groove 432, so as to ensure that the sliding rod 431 stably and steadily slides in the sliding groove 432. The existence of the limiting head 433 not only enhances the connection strength between the sliding rod 431 and the sliding groove 432, but also prevents the sliding rod 431 from accidentally falling out of the sliding groove 432 when subjected to external force. The installation of the sealing ring 434 can prevent dust, dirt or other impurities from entering the inside of the sliding groove 432, so as to keep the sliding groove 432 clean and lubricated, and prolong the service life of the sliding rod 431 and the sliding groove 432.

[0068] Embodiment 3:

[0069] The embodiment of the present application provides an industrial sewing machine, in addition to comprising the above technical features, the industrial sewing machine of the embodiment of the present application further comprises the following technical features.

[0070] As shown in the figure, the fastening assembly 500 comprises:

[0071] a positioning ring 510;

[0072] a first expansion head 520 arranged on the positioning ring 510, the diameter of the first expansion head 520 gradually increases from one end connected with the positioning ring 510 to the other end;

[0073] The center of the positioning ring 510 and the center of the first expansion head 520 are both provided with a threaded hole matched with the threaded segment 411, when the positioning ring 510 is gradually screwed with the positioning rod 410, the first expansion head 520 gradually expands the extension sleeve 420, and the outer wall of the extension sleeve 420 is matched with the inner wall of the bobbin.

[0074] In the embodiment of the present application, a threaded hole is arranged at the center of the positioning ring 510, the threaded hole is completely matched with the threaded segment 411 on the positioning rod 410, and by rotating the positioning ring 510, the user can adjust the relative position between the positioning ring 510 and the positioning rod 410. The first expansion head 520 is fixed on the positioning ring 510, and the shape of the first expansion head 520 is designed to gradually increase in diameter from one end connected with the positioning ring 510 to the other end. The tapered design enables the first expansion head 520 to push the extension sleeve 420 to expand outward like a wedge when the positioning ring 510 is gradually screwed with the positioning rod 410.

[0075] Meanwhile, the threaded holes in the center of the positioning ring 510 and the first expansion head 520 are matched with the threaded segment 411 on the positioning rod 410, and the threaded connection not only provides strong fastening force but also allows the user to adjust the fastening degree by rotating. When the positioning ring 510 is tightened, the first expansion head 520 will gradually move along the threaded direction and push the expansion sleeve 420 to expand outward until the outer wall of the expansion sleeve 420 tightly fits the inner wall of the bobbin. This expansion mechanism ensures that the bobbin can be tightly and uniformly fixed, and even if the bobbin shakes during sewing, it can still remain stable.

[0076] The arrangement of the fastening assembly 500 realizes quick and stable installation of the bobbin, and the user only needs to rotate the positioning ring 510 to make the expansion sleeve 420 gradually expand and tightly fit the inner wall of the bobbin through threaded connection and the pushing action of the first expansion head 520, which not only simplifies the installation process, improves work efficiency, but also enhances the stability and reliability of the equipment.

[0077] Further, the end of the positioning rod 410 away from the positioning ring 510 is provided with a second expansion head 530, and the second expansion head 530 has the same structure as the first expansion head 520 and is used to cooperate with the end of the expansion sleeve 420 away from the first expansion head 520.

[0078] The second expansion head 530 has the same structure as the first expansion head 520 and presents a tapered design with a gradually increasing diameter from one end to the other end, and this consistency ensures that the end of the positioning rod 410 or the other end can push the expansion sleeve 420 to expand in the same way.

[0079] The design purpose of the second expansion head 530 is to cooperate with the end of the expansion sleeve 420 away from the first expansion head 520. When the positioning rod 410 is tightened, the second expansion head 530 will gradually move along the threaded direction like the first expansion head 520 and push the other end of the expansion sleeve 420 to expand outward. This bidirectional expansion mechanism ensures that the expansion sleeve 420 can uniformly and stably fit on the inner wall of the bobbin, thereby improving the reliability and stability of the fixation.

[0080] Embodiment 4:

[0081] The embodiment of the present application provides an industrial sewing machine, in addition to comprising the above technical features, the industrial sewing machine of the embodiment of the present application further comprises the following technical features.

[0082] As shown in the figure, the workbench 100 is further connected with a dust collection fan 600 away from the sewing machine body 200, and the air inlet of the dust collection fan 600 is connected with an air duct 610, and one end of the air duct 610 is fixedly connected with a dust collection cover 620.

[0083] In the design of the industrial sewing machine, in order to improve the working environment, reduce the influence of dust and debris on the sewing operation, the dust collection fan 600 is connected to the side of the workbench 100 away from the sewing machine body 200 in the embodiment of the application. It can improve the cleanliness of the working environment and help protect the precision components inside the sewing machine from dust erosion.

[0084] The dust collection fan 600 is responsible for generating strong suction to suck dust, debris and other sundries in the working area into the dust collection system. Through the continuous work of the dust collection fan 600, the working area can be kept clean, and the interference of dust on the sewing operation and the internal components of the sewing machine can be reduced. The air duct 610 is used to connect the air inlet of the dust collection fan 600 and the dust collection cover 620. One end of the air duct 610 is fixedly connected to the air inlet of the dust collection fan 600, and the other end is connected to the dust collection cover 620, forming a complete dust collection channel. The opening of the dust collection cover 620 is provided with a grid or screen to prevent larger sundries from entering the dust collection system and causing blockage or damage.

[0085] Through the cooperative work of the dust collection fan 600, the air duct 610 and the dust collection cover 620, a high-efficiency dust collection system is formed to quickly suck and discharge the dust and debris in the working area.

[0086] It should be noted that in this paper, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "includes a" does not exclude the presence of another identical element in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the application is not limited to the order of the functions shown or discussed, but can also include the functions performed in a substantially simultaneous manner or in the opposite order, for example, the described method can be performed in an order different from the described order, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0087] The embodiments of the application are described above in combination with the drawings, but the application is not limited to the above specific embodiments, which are only illustrative and not limiting. Those skilled in the art can make many forms under the inspiration of the application without departing from the scope of the application and the protection scope of the claims.

Claims

1. An industrial sewing machine characterized by: The utility model relates to a sewing machine thread winding device, including: a workbench (100); a sewing machine body (200) arranged on the workbench (100) and located on the other side of the workbench (100); a mounting rack (300) arranged on the workbench (100), the middle part of which is provided with a limiting cylinder (310) for winding sewing thread; a placing structure arranged on the top of the mounting rack (300) for sleeving and fixing a thread cylinder; wherein the placing structure comprises a sleeving assembly (400) and a fastening assembly (500), and the fastening assembly (500) is arranged to gradually expand the sleeving assembly (400) when gradually tightened.

2. An industrial sewing machine according to claim 1, characterized in that: The sleeving assembly (400) comprises: a positioning rod (410) having one end arranged on the mounting rack (300) and the other end provided with a threaded segment (411); an expansion sleeve (420) comprising a plurality of expansion leaves (421), the diameters of the two ends of the expansion leaves (421) gradually decreasing from outside to inside; a matching structure (430) comprising a sliding rod (431) arranged on the inner wall of each expansion leaf (421) and a sliding groove (432) arranged on the positioning rod (410) and adapted to the sliding rod (431); wherein the expansion leaves (421) are fan-shaped, and the plurality of expansion leaves (421) can be spliced to form a circular ring.

3. An industrial sewing machine according to claim 2, characterized in that: The fastening assembly (500) comprises: a positioning ring (510); a first expansion head (520) arranged on the positioning ring (510), the diameter of which gradually increases from one end connected to the positioning ring (510) to the other end; wherein the positioning ring (510) and the first expansion head (520) are both provided with a threaded hole adapted to the threaded segment (411) at the center, and when the positioning ring (510) and the positioning rod (410) are gradually tightened, the first expansion head (520) gradually expands the expansion sleeve (420), and the outer wall of the expansion sleeve (420) is attached to the inner wall of the thread cylinder.

4. An industrial sewing machine according to claim 3, characterized in that: The end of the positioning rod (410) away from the positioning ring (510) is provided with a second expansion head (530), which has the same structure as the first expansion head (520) and is used to cooperate with the end of the expansion sleeve (420) away from the first expansion head (520).

5. An industrial sewing machine according to claim 4, characterized in that: The bottom of the sliding rod (431) is provided with a limiting head (433), which is in sliding cooperation with the sliding groove (432), and the opening at the top of the sliding groove (432) is provided with a sealing ring (434).

6. An industrial sewing machine according to claim 5, characterized in that: The side of the workbench (100) away from the sewing machine body (200) is also connected to a dust suction fan (600), the air inlet of the dust suction fan (600) is connected to an air guide pipe (610), and one end of the air guide pipe (610) is fixedly connected to a dust suction cover (620).

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