Needle bar oil return mechanism and sewing machine

Abstract

The utility model relates to the technical field of sewing machines, in particular to a needle bar oil return mechanism and a sewing machine. The needle bar oil return mechanism comprises a machine shell assembly, a needle bar assembly and an oil seal, the oil seal is connected to the machine shell assembly, the needle bar assembly is arranged on the machine shell assembly and the oil seal in a penetrating mode and can move in the axial direction relative to the machine shell assembly and the oil seal, and an oil collecting cavity is defined by the machine shell assembly, the needle bar assembly and the oil seal. An oil return channel is formed in the machine shell assembly and communicated with the oil collecting cavity, and the end, away from the oil collecting cavity, of the oil return channel is used for being communicated with an oil return pipe. According to the needle bar oil return mechanism and the sewing machine, the problems that an existing oil return structure of the sewing machine is poor in safety, and sewing materials are polluted by leaked oil easily are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewing machine technical field, in particular to a needle bar oil return mechanism and a sewing machine. BACKGROUND

[0002] The sewing machine is a kind of machine that is used to interweave or sew up sewing materials by needle bar, and needle bar needs to move back and forth at high speed during work process, in order to avoid that needle bar is worn due to friction, it is often necessary to apply lubricating oil to needle bar for lubrication, but this also needs to prevent lubricating oil from polluting sewing materials due to oil leakage.

[0003] In related technologies, the oil seal is generally used to scrape oil for needle bar, and then the oil outlet pipe extended from the oil seal is connected with external oil return pipe and oil pump, so as to suck and recover lubricating oil by oil pump. However, the risk of collision and damage of the oil seal and the oil return pipe is relatively high, and the oil leakage risk is still increased. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a needle bar oil return mechanism and a sewing machine to solve the problem that the safety of the oil return structure of the existing sewing machine is poor and oil leakage pollutes sewing materials.

[0005] The present application provides a needle bar oil return mechanism, which is applied to a sewing machine, and comprises a machine shell assembly, a needle bar assembly and an oil seal.

[0006] In one of the embodiments, the machine shell assembly is configured with an inner cavity, and one end of the oil return channel away from the oil collecting cavity penetrates the inner wall of the inner cavity and is used to communicate with the oil return pipe.

[0007] In one of the embodiments, the oil return channel comprises a first channel hole and a second channel hole, the first channel hole communicates with the oil collecting cavity, one end of the first channel hole penetrates the outer side wall of the machine shell assembly, and the other end communicates with the second channel hole, the second channel hole is arranged at an angle with the first channel hole, one end of the second channel hole penetrates the outer side wall of the machine shell assembly, and the other end penetrates the inner wall of the inner cavity, and the first channel hole is connected with a first sealing element at one end close to the outer side wall of the machine shell assembly, and the second channel hole is connected with a second sealing element at one end close to the outer side wall of the machine shell assembly.

[0008] In one of the embodiments, the casing assembly is configured with a head cavity, and the oil return channel penetrates through the inner wall of the head cavity and is used for communicating with the oil return pipe.

[0009] In one of the embodiments, the oil return channel extends in a straight line.

[0010] In one of the embodiments, the oil return channel comprises a third channel hole and a fourth channel hole, the third channel hole communicates with the oil collection cavity, and one end of the third channel hole penetrates through the outer side wall of the casing assembly, and the other end of the third channel hole communicates with the fourth channel hole; the fourth channel hole is arranged at an angle with the third channel hole, and one end of the fourth channel hole penetrates through the outer side wall of the casing assembly, and the other end of the fourth channel hole penetrates through the inner wall of the head cavity; wherein the third channel hole is connected with a third sealing member at the end close to the outer side wall of the casing assembly, and the fourth channel hole is connected with a fourth sealing member at the end close to the outer side wall of the casing assembly.

[0011] In one of the embodiments, the oil return channel comprises a fifth channel hole and a sixth channel hole, the fifth channel hole communicates with the oil collection cavity, and one end of the fifth channel hole penetrates through the outer side wall of the casing assembly, and the other end of the fifth channel hole communicates with the sixth channel hole; the sixth channel hole is arranged at an angle with the fifth channel hole, and one end of the sixth channel hole penetrates through the outer side wall of the casing assembly away from the fifth channel hole; wherein the fifth channel hole is connected with a fifth sealing member at the end close to the outer side wall of the casing assembly, the sixth channel hole is connected with an oil nozzle at the end close to the outer side wall of the casing assembly, and the sixth channel hole can communicate with the oil return pipe through the oil nozzle.

[0012] In one of the embodiments, the oil seal is provided with a sealing lip, and the oil seal is tightly abutted to the outer periphery of the needle bar assembly through the sealing lip.

[0013] In one of the embodiments, the number of the sealing lips is multiple, and the multiple sealing lips are arranged at intervals along the axial direction of the oil seal.

[0014] In one of the embodiments, the oil seal further comprises a clamping member, the clamping member is clamped on the outer periphery of the sealing lip to apply a force to the sealing lip towards the direction close to the needle bar assembly.

[0015] The application also provides a sewing machine, which comprises an oil return pump, an oil return pipe and the needle bar oil return mechanism of any one of the above embodiments, the oil return pump can suck the lubricating oil in the oil collection cavity through the oil return pipe and the oil return channel.

[0016] Compared with the prior art, the needle bar oil return mechanism and the sewing machine provided by the application can scrape the excess lubricating oil on the outer wall of the needle bar assembly and store it in the oil collecting cavity during the axial reciprocating movement of the needle bar assembly, and then discharge the lubricating oil in time through the oil return channel, so as to avoid the splashing of too much lubricating oil to contaminate the cloth. Moreover, the oil return channel directly communicating with the oil collecting cavity is arranged on the machine shell assembly, which makes the oil return channel less affected by the oil seal and other components during the oil return process, and can avoid the risk of damage to the components in the related oil return structure arranged outside the machine shell assembly in the traditional technology, and also makes the appearance of the entire machine more indirect and beautiful. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 Structure schematic view of the sewing machine provided by an embodiment of the application;

[0019] Figure 2 Cross-sectional view of the needle bar oil return mechanism of the first embodiment provided by the application;

[0020] Figure 3 Cross-sectional view of the needle bar oil return mechanism of the second embodiment provided by the application; Figure 2 Enlarged view of A in FIG. 4;

[0021] Figure 4 Cross-sectional view of the needle bar oil return mechanism of the third embodiment provided by the application; Figure 3 Cross-sectional view of B-B in FIG. 5;

[0022] Figure 5 Cross-sectional view of the needle bar oil return mechanism of the fourth embodiment provided by the application;

[0023] Figure 6 Cross-sectional view of the needle bar oil return mechanism of the fourth embodiment provided by the application;

[0024] Figure 7 Cross-sectional view of the needle bar oil return mechanism of the fourth embodiment provided by the application;

[0025] Figure 8 Cross-sectional view of the oil seal of an embodiment provided by the application;

[0026] Figure 9 Cross-sectional view of the oil seal of another embodiment provided by the application;

[0027] Figure 10 Cross-sectional view of the oil seal of another embodiment provided by the application;

[0028] Figure 11 A cross-sectional view of an oil seal of yet another embodiment of the present application.

[0029] The symbols in the drawings have the following meanings:

[0030] 100, needle bar oil return mechanism; 10, housing assembly; 101, oil collection cavity; 102, oil return passage; 1021, first passage hole; 1022, second passage hole; 1023, third passage hole; 1024, fourth passage hole; 1025, fifth passage hole; 1026, sixth passage hole; 103, inner cavity; 104, head cavity; 11, first seal; 12, second seal; 13, third seal; 14, fourth seal; 15, fifth seal; 16, oil nozzle; 20, needle bar assembly; 30, oil seal; 31, sealing lip; 32, clamping member; 200, sewing machine; 210, oil return pipe; 220, oil return pump. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and one of ordinary skill in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0032] It should be noted that when a component is referred to as being "fixed" or "set" on another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in the description of the present application are for the purpose of illustration only and do not indicate the only implementation.

[0033] In addition, the terms "first", "second", etc. are used only for the purpose of description and should not be understood as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0034] In the present application, unless specifically defined and limited otherwise, the first feature is "on", "under", "above" or "over" the second feature, which can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature is "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "below", "under" and "under" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0035] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0036] A sewing machine is a machine that interweaves or sews together sewing materials and the like through a needle bar. In the working process, the needle bar needs to move back and forth at high speed. In order to avoid the needle bar from being worn due to friction, it is often necessary to apply lubricating oil to the needle bar for lubrication, but this also needs to prevent the lubricating oil from polluting the sewing materials due to oil leakage.

[0037] In the related art, the sewing machine usually uses an oil seal to scrape oil from the needle bar, and then connects the oil outlet pipe extending from the oil seal to the external oil return pipe and the oil pump, so as to recover the lubricating oil through the oil pump. However, this way has a high risk of collision and damage of the oil seal and the oil return pipe, which still increases the risk of oil leakage.

[0038] Please refer to Figures 1-11 To solve the problem of poor safety of the oil return structure of the existing sewing machine, which easily leads to oil leakage and pollution of the sewing materials, the present application provides a needle bar oil return mechanism 100, which is applied to a sewing machine 200. The sewing machine 200 further comprises an oil return pump 220 and an oil return pipe 210, and the oil return pump 220 communicates with the needle bar oil return mechanism 100 through the oil return pipe 210.

[0039] Specifically, the needle bar oil return mechanism 100 comprises a housing assembly 10, a needle bar assembly 20 and an oil seal 30, the oil seal 30 is connected to the housing assembly 10, the needle bar assembly 20 is arranged in the housing assembly 10 and the oil seal 30 and can move axially relative to the housing assembly 10 and the oil seal 30, and an oil collecting cavity 101 is formed between the housing assembly 10, the needle bar assembly 20 and the oil seal 30. The housing assembly 10 is provided with an oil return channel 102, the oil return channel 102 is in communication with the oil collecting cavity 101, and an end of the oil return channel 102 away from the oil collecting cavity 101 is used for communication with an oil return pipe 210. Here, the oil return pipe 210 can be bonded and fixed to the housing assembly 10 to achieve sealing.

[0040] It can be understood that during the axial reciprocating movement of the needle bar assembly 20, the oil seal 30 can scrape off the excess lubricating oil on the outer wall of the needle bar assembly 20 and store it in the oil collecting cavity 101. Then, the lubricating oil is discharged in time through the oil return channel 102, so as to avoid too much lubricating oil from splashing out and polluting the cloth. Moreover, since the oil return channel 102 in direct communication with the oil collecting cavity 101 is arranged on the housing assembly 10, the oil return channel 102 is less affected by the oil seal 30 and other components during the oil return process, and the risk of damage to the components in the related oil return structure arranged outside the housing assembly 10 in the prior art can be avoided. At the same time, the appearance of the entire machine body can also be more indirect and beautiful.

[0041] In an embodiment, as shown in Figures 8-11 , the oil seal 30 is provided with a sealing lip 31, and the oil seal 30 tightly abuts the outer periphery of the needle bar assembly 20 through the sealing lip 31. Here, the sealing lip 31 plays a sealing role on the one hand, preventing the lubricating oil inside the oil collecting cavity 101 from leaking, and also preventing impurities such as cloth scraps and flying lint from entering the gap between the oil seal 30 and the needle bar assembly 20, aggravating the wear of the needle bar assembly 20 or even causing the needle bar assembly 20 to be stuck. On the other hand, the sealing lip 31 can also scrape off the lubricating oil on the outer wall of the needle bar assembly 20 to prevent the lubricating oil from splashing and polluting the cloth.

[0042] Specifically, the sealing lip 31 has elasticity and can provide sufficient pre-tightening force to ensure that the sealing lip 31 is always tightly attached to the outer wall of the needle bar assembly 20.

[0043] Since the sealing lip 31 will be worn after long-term use, in order to ensure the sealing and oil scraping effect of the oil seal 30 on the needle bar assembly 20, in an embodiment, as shown in Figure 9 and Figure 10 , the number of sealing lips 31 is multiple, and the multiple sealing lips 31 are arranged along the axial direction of the oil seal 30. By arranging multiple sealing lips 31 to cooperate with the needle bar assembly 20, the oil seal 30 can better adapt to harsh environments and greatly prolong the service life of the oil seal 30.

[0044] Specifically, when the number of sealing lips 31 is multiple, the sealing lips 31 arranged close to the outside of the oil collection cavity 101 mainly play a dustproof role, preventing impurities from invading to cause rapid wear of the inner sealing lips 31, thereby ensuring that the inner sealing lips 31 have good oil scraping effect and prevent leakage and pollution of the cloth.

[0045] Exemplarily, the sealing lips 31 can be arranged as one as shown in Figure 8 and Figure 11 . The structure is simple, and the cost is low. Of course, in other embodiments, the sealing lips 31 can also be arranged as two as shown in Figure 9 or arranged as three as shown in Figure 10 . The number thereof can be reasonably arranged according to actual needs, which is not limited herein.

[0046] Further, in an embodiment, as shown in Figure 11 , the oil seal 30 further comprises a clamping member 32, which is clamped on the outer periphery of the sealing lip 31 to apply an action force to the sealing lip 31 towards the needle bar assembly 20.

[0047] It is easy to understand that the sealing lip 31 will age after long-term use, resulting in a decrease in elasticity. By arranging the clamping member 32, a pre-tightening force can be applied to the sealing lip 31 by the clamping member 32, so as to better compensate for the aging and wear of the sealing lip 31 caused by long-term use, ensure that the sealing lip 31 is always tightly attached to the outer wall of the needle bar assembly 20, and thereby greatly reduce the risk of pollution of the cloth caused by leakage of lubricating oil.

[0048] Optionally, the clamping member 32 can be arranged as a hoop spring or other ring-shaped structure with contraction elasticity.

[0049] Generally, the housing assembly 10 is configured with a relatively independently arranged inner cavity 103 and a head cavity 104. The inner cavity 103 is located inside the housing assembly 10 and can be used for mounting other related parts of the sewing machine 200. The head cavity 104 is used for mounting parts such as a crank and a crank pin. The crank is hinged to the needle bar assembly 20 through the crank pin, thereby driving the needle bar assembly 20 to move. The head cavity 104 is a closed cavity. When the device is running, the crank, the crank pin and the needle bar assembly 20 move at high speed, and a negative pressure can be formed in the head cavity 104, thereby pressing the lubricating oil from the related pipeline into the head cavity 104. At the same time, the lubricating oil is scattered by high-speed movement, so that part of the lubricating oil contacts the crank, the crank pin and the needle bar assembly 20 to achieve lubrication, and another part flows back to the inner cavity 103 of the housing assembly 10 under the action of gravity through structures such as an oil return hole.

[0050] Embodiment one

[0051] Please refer to Figures 1-4In the embodiment, the oil return channel 102 penetrates the inner wall of the inner cavity 103 at the end away from the oil collecting cavity 101 and is used for communication with the oil return pipe 210. In this way, the related parts participating in the return of the lubricating oil are all located on or inside the casing assembly 10, that is, a complete and sealed path for the return of the lubricating oil can be formed inside the casing assembly 10, further reducing the risk of damage to the parts and ensuring the safety of the return of the lubricating oil.

[0052] Specifically, the oil return channel 102 includes a first channel hole 1021 and a second channel hole 1022. The first channel hole 1021 is in communication with the oil collecting cavity 101 and penetrates the outer side wall of the casing assembly 10 at one end and is in communication with the second channel hole 1022 at the other end. The second channel hole 1022 is arranged at an angle with the first channel hole 1021 and penetrates the outer side wall of the casing assembly 10 at one end and the inner wall of the inner cavity 103 at the other end. In this way, by penetrating the outer side wall of the casing assembly 10 with the first channel hole 1021 and the second channel hole 1022, the machining of the first channel hole 1021 and the second channel hole 1022 can be directly performed outside the casing assembly 10, thereby effectively reducing the machining difficulty of the first channel hole 1021 and the second channel hole 1022.

[0053] Here, the first channel hole 1021 and the second channel hole 1022 are preferably arranged perpendicular to the axial direction of the needle bar assembly 20, which can further reduce the risk of contamination of the fabric by the flying lubricating oil. At the same time, the vertical arrangement of the first channel hole 1021 and the second channel hole 1022 can more easily determine the position of the first channel hole 1021 and the second channel hole 1022, and the machining is simpler.

[0054] At the same time, in order to ensure the sealing of the oil return channel 102, the first channel hole 1021 is connected with a first sealing member 11 at the end close to the outer side wall of the casing assembly 10, and the second channel hole 1022 is connected with a second sealing member 12 at the end close to the outer side wall of the casing assembly 10. Here, the first sealing member 11 and the second sealing member 12 can be arranged as screws or sealing plugs and are detachably connected with the casing assembly 10, so as to facilitate the subsequent cleaning of the oil return channel 102 and prevent blockage.

[0055] Embodiment Two

[0056] Please refer to Figure 5 In the embodiment, the oil return channel 102 penetrates the inner wall of the inner cavity 103 at the end away from the oil collecting cavity 101 and is used for communication with the oil return pipe 210. In the same way, in this way, the related parts participating in the return of the lubricating oil are all located on or inside the casing assembly 10, that is, a complete and sealed path for the return of the lubricating oil can be formed inside the casing assembly 10, further reducing the risk of damage to the parts and ensuring the safety of the return of the lubricating oil.

[0057] Further, the oil return channel 102 extends in a straight line. In this way, the oil return channel 102 has a simple structure and low processing cost.

[0058] Embodiment three

[0059] Please refer to Figure 6 In this embodiment, the oil return channel 102 penetrates the inner wall of the machine head cavity 104 at the end away from the oil collection cavity 101 and is used to communicate with the oil return pipe 210. Similarly, in this way, the related parts involved in the return of the lubricating oil are located on or inside the machine shell assembly 10, that is, a complete and sealed path for returning oil can be formed inside the machine shell assembly 10, further reducing the risk of damage to the parts and ensuring the safety of the oil return.

[0060] Further, the oil return channel 102 includes a third channel hole 1023 and a fourth channel hole 1024. The third channel hole 1023 communicates with the oil collection cavity 101, and one end of the third channel hole 1023 penetrates the outer side wall of the machine shell assembly 10, and the other end communicates with the fourth channel hole 1024. The fourth channel hole 1024 is arranged at an angle with the third channel hole 1023, and one end of the fourth channel hole 1024 penetrates the outer side wall of the machine shell assembly 10, and the other end penetrates the inner wall of the machine head cavity 104. In this way, by penetrating the outer side wall of the machine shell assembly 10 with the third channel hole 1023 and the fourth channel hole 1024, the third channel hole 1023 and the fourth channel hole 1024 can be directly processed outside the machine shell assembly 10, thereby effectively reducing the processing difficulty of the third channel hole 1023 and the fourth channel hole 1024.

[0061] Here, the third channel hole 1023 and the fourth channel hole 1024 are arranged vertically, which can more easily determine the position of the third channel hole 1023 and the fourth channel hole 1024, and the processing is simpler.

[0062] At the same time, in order to ensure the sealing of the oil return channel 102, the third channel hole 1023 is connected with a third sealing member 13 at the end close to the outer side wall of the machine shell assembly 10, and the fourth channel hole 1024 is connected with a fourth sealing member 14 at the end close to the outer side wall of the machine shell assembly 10. Here, the third sealing member 13 and the fourth sealing member 14 can be provided as a screw or a sealing plug structure, and are detachably connected with the machine shell assembly 10, so as to facilitate subsequent cleaning of the oil return channel 102 and prevent blockage.

[0063] Embodiment four

[0064] Please refer to Figure 7In the embodiment, the oil return channel 102 comprises a fifth channel hole 1025 and a sixth channel hole 1026. The fifth channel hole 1025 is in communication with the oil collection cavity 101, and one end of the fifth channel hole 1025 penetrates the outer side wall of the machine shell assembly 10, and the other end is in communication with the sixth channel hole 1026. The sixth channel hole 1026 is arranged at an angle with the fifth channel hole 1025, and one end of the sixth channel hole 1026 away from the fifth channel hole 1025 penetrates the outer side wall of the machine shell assembly 10. In this way, the fifth channel hole 1025 in communication with the oil collection cavity 101 is located in the machine shell assembly 10 and is not easily affected by the outside world, and the pollution of the cloth caused by the leakage of lubricating oil from the oil seal 30 can be avoided.

[0065] Here, the fifth channel hole 1025 and the sixth channel hole 1026 are vertically arranged, so that the positions of the fifth channel hole 1025 and the sixth channel hole 1026 can be more easily determined, and the processing is simpler.

[0066] In order to ensure the sealing performance of the oil return channel 102, a fifth sealing member 15 is connected to one end of the fifth channel hole 1025 close to the outer side wall of the machine shell assembly 10. The fifth sealing member 15 can be in the form of a screw or a sealing plug, and is detachably connected to the machine shell assembly 10, so as to facilitate subsequent cleaning of the oil return channel 102 and prevent blockage. Further, an oil nozzle 16 is connected to one end of the sixth channel hole 1026 close to the outer side wall of the machine shell assembly 10, and the sixth channel hole 1026 can be in communication with the oil return pipe 210 through the oil nozzle 16. The oil nozzle 16 can be fixedly sealed to the machine shell assembly 10 by threads or glue, so as to ensure the stability and safety of the connection between the sixth channel hole 1026 and the oil return pipe 210.

[0067] The application also provides a sewing machine 200, which comprises an oil return pump 220, an oil return pipe 210, and the needle bar oil return mechanism 100 described above. The oil return pump 220 can suck the lubricating oil in the oil collection cavity 101 through the oil return pipe 210 and the oil return channel 102.

[0068] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not conflict, they should be considered as falling within the scope of the present application.

[0069] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent protection scope of the present application. It should be noted that for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A needle bar oil return mechanism, applied to a sewing machine, characterized in that, The needle bar oil return mechanism comprises a casing assembly (10), a needle bar assembly (20) and an oil seal (30), the oil seal (30) is connected to the casing assembly (10), the needle bar assembly (20) is arranged in the casing assembly (10) and the oil seal (30) and can move axially relative to the casing assembly (10) and the oil seal (30), and an oil collecting cavity (101) is formed among the casing assembly (10), the needle bar assembly (20) and the oil seal (30). The casing assembly (10) is provided with an oil return channel (102), the oil return channel (102) is communicated with the oil collecting cavity (101), and one end of the oil return channel (102) away from the oil collecting cavity (101) is used for being communicated with an oil return pipe (210).

2. The needle bar oil return mechanism according to claim 1, wherein, The casing assembly (10) is provided with an inner cavity (103), and one end of the oil return channel (102) away from the oil collecting cavity (101) penetrates the inner wall of the inner cavity (103) and is used for being communicated with the oil return pipe (210).

3. The needle bar oil return mechanism according to claim 2, wherein, The oil return channel (102) comprises a first channel hole (1021) and a second channel hole (1022), the first channel hole (1021) is communicated with the oil collecting cavity (101), one end of the first channel hole (1021) penetrates the outer side wall of the casing assembly (10), and the other end is communicated with the second channel hole (1022). The second channel hole (1022) is arranged at an angle with the first channel hole (1021), one end of the second channel hole (1022) penetrates the outer side wall of the casing assembly (10), and the other end penetrates the inner wall of the inner cavity (103). The first channel hole (1021) is connected with a first sealing element (11) at one end close to the outer side wall of the casing assembly (10), and the second channel hole (1022) is connected with a second sealing element (12) at one end close to the outer side wall of the casing assembly (10).

4. The needle bar oil return mechanism according to claim 1, wherein, The casing assembly (10) is provided with a head cavity (104), and one end of the oil return channel (102) away from the oil collecting cavity (101) penetrates the inner wall of the head cavity (104) and is used for being communicated with the oil return pipe (210).

5. The needle bar oil return mechanism according to claim 4, wherein, The oil return channel (102) extends in a straight line.

6. The needle bar oil return mechanism according to claim 4, wherein, The oil return channel (102) comprises a third channel hole (1023) and a fourth channel hole (1024), the third channel hole (1023) is communicated with the oil collecting cavity (101), one end of the third channel hole (1023) penetrates the outer side wall of the casing assembly (10), and the other end is communicated with the fourth channel hole (1024). The fourth channel hole (1024) is arranged at an angle with the third channel hole (1023), one end of the fourth channel hole (1024) penetrates the outer side wall of the casing assembly (10), and the other end penetrates the inner wall of the head cavity (104). The third passage hole (1023) is connected with a third sealing member (13) at one end close to the outer side wall of the shell assembly (10), and the fourth passage hole (1024) is connected with a fourth sealing member (14) at one end close to the outer side wall of the shell assembly (10).

7. The needle bar oil return mechanism according to claim 1, wherein, The oil return channel (102) comprises a fifth passage hole (1025) and a sixth passage hole (1026), the fifth passage hole (1025) communicates with the oil collecting cavity (101), and one end of the fifth passage hole (1025) penetrates through the outer side wall of the shell assembly (10), and the other end communicates with the sixth passage hole (1026); The sixth passage hole (1026) is arranged at an angle with the fifth passage hole (1025), and one end of the sixth passage hole (1026) away from the fifth passage hole (1025) penetrates through the outer side wall of the shell assembly (10); The fifth passage hole (1025) is connected with a fifth sealing member (15) at one end close to the outer side wall of the shell assembly (10), and the sixth passage hole (1026) is connected with an oil nozzle (16) at one end close to the outer side wall of the shell assembly (10), and the sixth passage hole (1026) can communicate with the oil return pipe (210) through the oil nozzle (16).

8. The needle bar oil return mechanism according to claim 1, wherein, The oil seal (30) is provided with a sealing lip (31), and the oil seal (30) is tightly abutted to the outer periphery of the needle bar assembly (20) through the sealing lip (31).

9. The needle bar oil return mechanism according to claim 8, wherein, The number of the sealing lip (31) is multiple, and multiple sealing lips (31) are arranged at intervals along the axial direction of the oil seal (30).

10. The needle bar oil return mechanism according to claim 8, wherein, The oil seal (30) further comprises a clamping member (32), and the clamping member (32) is clamped on the outer periphery of the sealing lip (31) to apply a force to the sealing lip (31) towards the direction close to the needle bar assembly (20).

11. A sewing machine characterized by comprising: The oil return pump (220), the oil return pipe (210) and the needle bar oil return mechanism according to any one of claims 1-10 are included, and the oil return pump (220) can suck the lubricating oil in the oil collecting cavity (101) through the oil return pipe (210) and the oil return channel (102).

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