Sewing machine and lubrication method for a sewing machine

Abstract

The application relates to a sewing machine and a lubricating method of the sewing machine, wherein the sewing machine comprises a rotating hook shaft assembly, the rotating hook shaft assembly comprises a rotating hook shaft moving structure, a rotating hook shaft structure and a toothed arch shaft structure, the rotating hook shaft moving structure is connected with the rotating hook shaft structure, the toothed arch shaft structure is matched with the rotating hook shaft structure, the rotating hook shaft structure comprises a spline rotating hook shaft and a spline shaft sleeve, and the spline shaft sleeve is arranged on the circumferential outer side of the spline rotating hook shaft; the spline rotating hook shaft is provided with a hollow first lubricating oil containing space and a first lubricating oil communication channel, the first lubricating oil communication channel is arranged on the side wall of the spline rotating hook shaft and is communicated with the first lubricating oil containing space and the outside of the spline rotating hook shaft, the outlet of the spline first lubricating oil communication channel is located on the spline shaft section of the spline rotating hook shaft, and the spline shaft sleeve is correspondingly arranged on the spline shaft section of the spline rotating hook shaft. The technical scheme of the application effectively solves the problem of unstable lubricating oil conveying of the sewing machine in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of sewing machine lubrication, and more specifically, to a sewing machine and a method for lubricating a sewing machine. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to create one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. Sewing machines include sewing machines, stitching machines, embroidery machines, and quilting machines, etc.

[0003] Sewing machines require the reciprocating motion of the needle and the rotary hook to work together. That is, the sewing machine has multiple moving parts inside, and these moving parts have relative motion with other parts or with themselves. This requires lubrication to reduce friction and wear.

[0004] Some existing sewing machines connect the moving parts of the needle to the oil supply tank, delivering lubricating oil to the areas requiring lubrication. This structure can lead to several problems: when the needle moves slowly, the lubricating oil cannot be delivered to the areas needing lubrication, resulting in increased friction and wear; when the needle moves quickly, the amount of lubricating oil delivered is large, causing waste and even contaminating the sewing thread. Summary of the Invention

[0005] This application provides a sewing machine and a lubrication method for the sewing machine to solve the problem of unstable lubricant delivery in the prior art.

[0006] A sewing machine according to this application includes: a rotary hook shaft assembly, the rotary hook shaft assembly including a rotary hook axial movement structure, a rotary hook shaft structure and a toothed shaft structure, the rotary hook axial movement structure being connected to the rotary hook shaft structure, the toothed shaft structure cooperating with the rotary hook shaft structure, the rotary hook shaft structure including a splined rotary hook shaft and a splined bushing, the splined bushing being sleeved on the circumferential outer side of the splined rotary hook shaft; the splined rotary hook shaft has a hollow first lubricating oil receiving space and a first lubricating oil communicating channel, the first lubricating oil communicating channel being disposed on the side wall of the splined rotary hook shaft and communicating with the first lubricating oil receiving space and the outside of the splined rotary hook shaft, the outlet of the splined first lubricating oil communicating channel being located at the splined shaft section of the splined rotary hook shaft, and the splined bushing being correspondingly disposed at the splined shaft section of the splined rotary hook shaft.

[0007] Furthermore, the tooth frame shaft structure includes a tooth frame crankshaft and a tooth frame connecting rod. The tooth frame crankshaft is sleeved on the circumferential outer side of the spline bushing, and the tooth frame connecting rod is rotatably sleeved on the circumferential outer side of the tooth frame crankshaft. The spline bushing has a second lubricating oil communication channel that passes through the side wall of the spline bushing, and the second lubricating oil communication channel is correspondingly provided with the tooth frame crankshaft.

[0008] Furthermore, the cross-sectional area of ​​the second lubricating oil connecting channel is larger than that of the first lubricating oil connecting channel.

[0009] Furthermore, the inner wall of the splined rotary hook shaft is an inclined wall surface, and the inner diameter of the splined rotary hook shaft gradually decreases from the inner wall of the first lubricating oil connecting channel to both sides of the splined rotary hook shaft.

[0010] Furthermore, the tooth frame connecting rod has a third lubricating oil communication channel, a fourth lubricating oil communication channel, and a hollow second lubricating oil receiving space. The third lubricating oil communication channel connects the second lubricating oil receiving space and the first rotating collar of the tooth frame connecting rod, and the fourth lubricating oil communication channel connects the second lubricating oil receiving space and the second rotating collar of the tooth frame connecting rod.

[0011] Furthermore, the tooth frame shaft structure also includes a tooth frame shaft, which has a hollow third lubricating oil receiving space, and a fifth lubricating oil connecting channel that penetrates the side wall of the tooth frame shaft.

[0012] Furthermore, the axial movement structure of the rotary hook includes a pull plate having a rotary hook shaft mounting hole rotatably mounted within the rotary hook shaft mounting hole of the pull plate. The pull plate has a sixth lubricating oil communication channel and a hollow fourth lubricating oil receiving space, the sixth lubricating oil communication channel connecting the fourth lubricating oil receiving space and the rotary hook shaft mounting hole.

[0013] Furthermore, the sewing machine also includes a first lubricating oil tank and a first oil guiding structure, the first oil guiding structure connecting the interior of the first lubricating oil tank and the toothed shaft structure.

[0014] Furthermore, the sewing machine also includes a head assembly, which includes a crank disc having a fifth lubricating oil receiving space and a seventh lubricating oil connecting channel, the seventh lubricating oil connecting channel connecting the crank disc's shaft mounting hole and the fifth lubricating oil receiving space.

[0015] According to another aspect of this application, a lubrication method for a sewing machine is also provided. The sewing machine is the sewing machine described above. The lubrication method for the sewing machine includes: lubricating the spline shaft section with lubricating oil inside the rotary hook itself; and lubricating with oiled cotton.

[0016] By applying the technical solution of this application, the axial movement structure of the rotary hook can drive the rotary hook shaft structure to move axially along the spline rotary hook shaft. The rotation of the spline rotary hook shaft drives the rotation of the spline bushing. There is a large force between the spline rotary hook shaft and the spline bushing, and there is relative motion during startup, requiring lubrication. The lubricating oil in the first lubricating oil accommodating space can lubricate the spline rotary hook shaft and the spline bushing through the first lubricating oil connecting channel under the action of centrifugal force, thus reducing friction and wear between the spline rotary hook shaft and the spline bushing. The above structure does not require long-distance lubricating oil delivery through an oil bath, and the lubrication is more stable. The technical solution of this application effectively solves the problem of unstable lubricating oil delivery in existing sewing machines. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional structural schematic diagram of a sewing machine according to an embodiment of this application is shown;

[0020] Figure 2 It shows Figure 1 A structural schematic diagram of a sewing machine from another angle;

[0021] Figure 3 It shows Figure 1 A three-dimensional structural diagram of the rotary hook shaft assembly of a sewing machine;

[0022] Figure 4 It shows Figure 3 A three-dimensional structural diagram of the splined rotary hook shaft assembly;

[0023] Figure 5 It shows Figure 3 A three-dimensional structural diagram of the splined bushing of the rotary shuttle shaft assembly;

[0024] Figure 6 It shows Figure 3 A three-dimensional structural diagram of the pull plate of the rotary shaft assembly;

[0025] Figure 7 It shows Figure 3 A schematic diagram of the internal structure of the gear frame shaft of the rotary hook shaft assembly;

[0026] Figure 8 It shows Figure 3 A schematic diagram of the internal structure of the first type of tooth frame connecting rod of the rotary hook shaft assembly;

[0027] Figure 9 It shows Figure 3 A schematic diagram of the internal structure of the second type of tooth frame connecting rod of the rotary hook shaft assembly;

[0028] Figure 10 It shows Figure 3 A schematic diagram of the internal structure of the third type of tooth frame connecting rod of the rotary hook shaft assembly;

[0029] Figure 11 It shows Figure 3 A three-dimensional structural diagram of the gear frame crankshaft of the rotary hook shaft assembly;

[0030] Figure 12 It shows Figure 1 A schematic diagram of the first oil guide structure of a sewing machine;

[0031] Figure 13 It shows Figure 1 A three-dimensional structural diagram of the crank disc of a sewing machine;

[0032] Figure 14 It shows Figure 13 A schematic diagram of the planar structure of the crank-disc;

[0033] Figure 15 It shows Figure 13 A cross-sectional view of the crank-disc.

[0034] The above figures include the following reference numerals:

[0035] 10. Hook shaft assembly; 11. Hook axial movement structure; 111. Pull plate; 1111. Hook shaft mounting hole; 1112. Sixth lubricating oil connecting channel; 1113. Fourth lubricating oil receiving space; 12. Hook shaft structure; 121. Splined hook shaft; 1211. First lubricating oil receiving space; 1212. First lubricating oil connecting channel; 122. Splined bushing; 1221. Second lubricating oil connecting channel; 13. Gear frame shaft structure; 131. Gear frame crankshaft; 132. Gear frame connecting... Rod; 1321, Third lubricating oil connecting channel; 1322, Fourth lubricating oil connecting channel; 1323, Second lubricating oil containing space; 133, Gear shaft; 1331, Third lubricating oil containing space; 1332, Fifth lubricating oil connecting channel; 20, First lubricating oil tank; 30, First oil guiding structure; 31, Oil cotton; 32, Oil cotton sleeve; 40, Machine head assembly; 41, Crank disc; 411, Fifth lubricating oil containing space; 412, Seventh lubricating oil connecting channel; 50, Machine base. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0038] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] like Figures 1 to 15 As shown, the sewing machine of this embodiment includes: a rotary hook shaft assembly 10, the rotary hook shaft assembly 10 includes a rotary hook axial moving structure 11, a rotary hook shaft structure 12 and a toothed shaft structure 13, the rotary hook axial moving structure 11 is connected to the rotary hook shaft structure 12, the toothed shaft structure 13 cooperates with the rotary hook shaft structure 12, the rotary hook shaft structure 12 includes a splined rotary hook shaft 121 and a splined bushing 122, the splined bushing 122 is sleeved on the circumferential outer side of the splined rotary hook shaft 121. The splined rotary hook shaft 121 has a hollow first lubricating oil containing space 1211 and a first lubricating oil connecting channel 1212. The first lubricating oil connecting channel 1212 is disposed on the side wall of the splined rotary hook shaft 121 and connects the first lubricating oil containing space 1211 and the outside of the splined rotary hook shaft 121. The outlet of the splined first lubricating oil connecting channel 1212 is located on the splined shaft section of the splined rotary hook shaft 121, and the splined bushing 122 is correspondingly disposed on the splined shaft section of the splined rotary hook shaft 121.

[0040] Applying the technical solution of this embodiment, the rotary hook axial movement structure 11 can drive the rotary hook shaft structure 12 to move axially along the spline rotary hook shaft 121. The rotation of the spline rotary hook shaft 121 drives the spline bushing 122 to rotate. There is a large force between the spline rotary hook shaft 121 and the spline bushing 122, and there will be relative movement during startup, requiring lubrication. The lubricating oil in the first lubricating oil receiving space 1211 can lubricate the spline rotary hook shaft 121 and the spline bushing 122 through the first lubricating oil connecting channel 1212 under the action of centrifugal force, thus reducing the friction and wear between the spline rotary hook shaft 121 and the spline bushing 122. The above structure does not require long-distance lubricating oil delivery through an oil bath, and the lubrication is more stable. The technical solution of this embodiment effectively solves the problem of unstable lubricating oil delivery in the prior art sewing machine.

[0041] It should be noted that the through axis of the first lubricating oil connecting channel 1212 extends radially along the splined rotary hook shaft 121. The aforementioned splined shaft segment does not refer only to one end of the splined rotary hook shaft 121, but rather to the portion between the first end and the second end of the splined rotary hook shaft 121. The portion of the gear shaft structure 13 that mates with the splined rotary hook shaft 121 is collectively referred to as the splined shaft segment, which also includes a portion of the smooth rod segment. The extension direction of the splines on the splined rotary hook shaft 121 is parallel to the axial direction of the splined rotary hook shaft.

[0042] like Figures 7 to 11 As shown, in this embodiment, the dental arch shaft structure 13 includes a dental arch crankshaft 131 and a dental arch connecting rod 132. The dental arch crankshaft 131 is sleeved on the circumferential outer side of the splined bushing 122, and the dental arch connecting rod 132 is rotatably sleeved on the circumferential outer side of the dental arch crankshaft 131. The splined bushing 122 has a second lubricating oil communication channel 1221 that penetrates the side wall of the splined bushing 122, and the second lubricating oil communication channel 1221 is correspondingly arranged with the dental arch crankshaft 131. The above-mentioned lubricating oil structure can reduce the friction and wear of the dental arch shaft structure 13. It should be noted that the dental arch shaft structure 13 also includes a dental arch shaft drive motor. The dental arch shaft 133 is rotated by the dental arch shaft drive motor to realize the forward or reverse feeding of the dental arch, as well as the feeding distance each time. During operation, the rotation of the splined rotary hook shaft 121 drives the splined bushing 122 to rotate, and the rotation of the splined bushing 122 drives the rotation of the tooth frame crankshaft 131. The tooth frame connecting rod 132 rotates relative to the tooth frame crankshaft 131. Due to the periodic approach and departure of the tooth frame connecting rod 132 driven by the tooth frame crankshaft 131, the tooth frame pushes the object to be sewn (such as fabric).

[0043] like Figure 4 , Figure 5 and Figure 11As shown, in this embodiment, the cross-sectional area of ​​the second lubricating oil connecting channel 1221 is larger than that of the first lubricating oil connecting channel 1212. This structure facilitates the passage of lubricating oil through both the second and first lubricating oil connecting channels 1221 and 1212. It should be noted that the first lubricating oil connecting channel 1212 has a circular cross-sectional area, and the second lubricating oil connecting channel 1221 extends circumferentially along the splined bushing 122, with a width greater than the diameter of the first lubricating oil connecting channel 1212. The second lubricating oil connecting channel 1221 extends circumferentially along the splined sleeve 122, making the lubricating oil cover a wider circumferential lubrication range. The width of the second lubricating oil connecting channel 1221 is greater than the diameter of the first lubricating oil connecting channel 1212. This ensures that the first lubricating oil connecting channel 1212 and the second lubricating oil connecting channel 1221 are always in a connected state when the splined rotary shaft 121 moves axially. That is, the lubricating oil can flow through the first lubricating oil connecting channel 1212 and the second lubricating oil connecting channel 1221 to the parts that need lubrication.

[0044] In this embodiment, the inner wall of the splined rotary hook shaft 121 is an inclined wall. From the inner wall of the first lubricating oil connecting channel 1212 to both sides of the splined rotary hook shaft 121, the inner diameter of the splined rotary hook shaft 121 gradually decreases. This structure ensures that the position corresponding to the first lubricating oil connecting channel 1212 inside the splined rotary hook shaft 121 is where lubricating oil easily accumulates. Thus, when the splined rotary hook shaft 121 rotates, lubricating oil enters the first lubricating oil connecting channel 1212 under the action of centrifugal force. That is, even when the interior of the splined rotary hook shaft 121 has less lubricating oil, the lubrication effect of the rotary hook shaft assembly 10 can still be guaranteed. It should be noted that the inclination angle between the two ends of the splined rotary hook shaft 121 and the position corresponding to the first lubricating oil connecting channel 1212 is between 0.5° and 3°, and the inner wall of the annular shape corresponding to the first lubricating oil connecting channel 1212 is at a lower position, where lubricating oil easily accumulates.

[0045] like Figure 3 , Figures 8 to 10As shown, in this embodiment, the tooth frame connecting rod 132 has a third lubricating oil communication channel 1321, a fourth lubricating oil communication channel 1322, and a hollow second lubricating oil receiving space 1323. The third lubricating oil communication channel 1321 connects the second lubricating oil receiving space 1323 and the first rotating shaft collar of the tooth frame connecting rod 132, and the fourth lubricating oil communication channel 1322 connects the second lubricating oil receiving space 1323 and the second rotating shaft collar of the tooth frame connecting rod 132. The tooth frame connecting rod 132 with the above structure can meet the lubrication requirements through its own structure. It should be noted that there are three tooth frame connecting rods 132, and each tooth frame connecting rod 132 is similar. Each tooth frame connecting rod 132 includes a tooth frame connecting rod body and a tooth frame connecting rod cover. The tooth frame connecting rod body has a groove, and the tooth frame connecting rod cover is fastened to the tooth frame connecting rod body to seal the groove, thereby forming the second lubricating oil receiving space 1323. The tooth frame connecting rod 132 has bosses on both sides, and screws are used to fasten the bosses on the tooth frame connecting rod body and the bosses on the tooth frame connecting rod cover. The above structure is easy to connect and has a good sealing effect.

[0046] like Figure 7 As shown, in the technical solution of this embodiment, the tooth frame shaft structure 13 further includes a tooth frame shaft 133. The tooth frame shaft 133 has a hollow third lubricating oil receiving space 1331, and a fifth lubricating oil connecting channel 1332 that penetrates the side wall of the tooth frame shaft 133 is provided on the tooth frame shaft 133. The tooth frame shaft 133 described above can also meet the lubrication problem of relative movement between itself and other components through its own structure. It should be noted that the tooth frame shaft structure includes two tooth frame shafts 133, a tooth frame, and fasteners. The two tooth frame shafts 133 are located on both sides of the tooth frame, and each tooth frame shaft 133 is provided with a fastener. The active side is connected to the tooth frame crankshaft 131 through the tails of two tooth frame connecting rods 132, and is rotatably connected to the tooth frame crankshaft 131, and rotatably connected to the fasteners of the tooth frame shaft 133.

[0047] like Figure 3 and Figure 6As shown, in this embodiment, the axial movement structure 11 of the rotary hook includes a pull plate 111. The pull plate 111 has a rotary hook shaft mounting hole 1111, which is rotatably installed within the rotary hook shaft mounting hole 1111 of the pull plate 111. The pull plate 111 has a sixth lubricating oil communication channel 1112 and a hollow fourth lubricating oil receiving space 1113. The sixth lubricating oil communication channel 1112 connects the fourth lubricating oil receiving space 1113 and the rotary hook shaft mounting hole 1111. The pull plate 111, through its own structure, can satisfy the lubrication between the pull plate 111 and the splined rotary hook shaft 121. It should be noted that the axial movement structure 11 of the rotary hook includes a rotary hook axial movement motor, a screw, and a drive plate. The screw is connected to the rotary hook axial movement motor, and the drive plate has a threaded hole. The screw is connected to the threaded hole via a thread, and the drive plate is connected to the pull plate via a pull rod. The rotation of the rotary hook axial movement motor is converted into the translation of the drive plate and the pull plate 111, thereby adjusting the axial position of the spline rotary hook shaft 121. It should also be noted that the fourth lubricating oil receiving space 1113 is located above the rotary hook shaft mounting hole 1111, and the sixth lubricating oil connecting channel 1112 is located above the horizontal plane passing through the rotary hook shaft. The axis of the sixth lubricating oil connecting channel 1112 forms an angle of 15° to 75° with the horizontal plane.

[0048] like Figure 3 and Figure 12 As shown, in this embodiment, the sewing machine further includes a first lubricating oil tank 20 and a first oil guiding structure 30. The first oil guiding structure 30 connects the interior of the first lubricating oil tank 20 and the toothed frame shaft structure 13. The arrangement of the first lubricating oil tank 20 and the first oil guiding structure 30 enables diverse lubrication methods for the sewing machine. For example, in structures where it is inconvenient to provide a lubricating oil storage space, the connection between the toothed frame and the fasteners mounted on the toothed frame shaft 133 can be facilitated by the first oil guiding structure 30, directing the lubricating oil from the first lubricating oil tank 20 to the relative movement points. The first oil guiding structure 30 includes an oil cotton 31 and an oil cotton sleeve 32. The first lubricating oil tank 20 and the first oil guiding structure 30 are components of the first oil storage tank assembly.

[0049] like Figure 1 , Figure 2 as well as Figures 13 to 15 As shown in the technical solution of this embodiment, the sewing machine also includes a sewing head device 40, which includes a crank disc 41. The crank disc 41 has a fifth lubricating oil receiving space 411 and a seventh lubricating oil connecting channel 412. The seventh lubricating oil connecting channel 412 connects the rotating shaft mounting hole of the crank disc 41 and the fifth lubricating oil receiving space 411. The crank disc 41 achieves self-lubrication through its own structure. It should be noted that the aforementioned crank disc 41 is connected to the needle drive motor. The first end of the needle connecting rod is rotatably connected to the crank disc 41, and the second end of the needle connecting rod is connected to the needle bar structure, driving the needle bar structure to move up and down.

[0050] The sewing machine head assembly includes a sewing machine head oil supply mechanism, which further includes a second oil reservoir assembly. The second oil reservoir assembly includes a second oil reservoir and a second oil guiding structure. The needle bar assembly includes a needle bar structure and a first needle bar sleeve. The first needle bar sleeve cooperates with the sewing machine body and is sleeved on the circumferential outer side of the needle bar structure. The first needle bar sleeve has a first connecting hole penetrating the side wall of the first needle bar sleeve. The first oil guiding structure connects the interior of the first oil reservoir and the first connecting hole.

[0051] By applying the technical solution of this embodiment, a second oil reservoir and a second oil guiding structure are provided. The second oil guiding structure connects the interior of the second oil reservoir to a second connecting hole, allowing the lubricating oil in the second oil reservoir to be guided to the needle bar assembly. This lubricates the relatively moving parts between the first needle bar sleeve and the needle bar structure, changing the traditional method of using the movement of the needle to drive the lubricating oil, which results in varying lubricating oil output depending on the needle speed. This method provides a more stable lubricating oil output and a more consistent lubrication effect. The technical solution of this embodiment effectively solves the problem of unstable lubricating oil delivery in existing sewing machines.

[0052] In this embodiment, the inner wall of the first needle shaft sleeve has a first oil guide groove, which extends axially along the needle shaft structure and communicates with the first connecting hole. The first oil guide groove facilitates the containment of the first oil cotton, which guides the lubricating oil between the first needle shaft sleeve and the needle shaft structure, reducing friction, wear, and even seizing. In this embodiment, one first connecting hole is sufficient, and one first oil guide groove is provided. The outlet of the first connecting hole is located slightly above the middle of the first oil guide groove. The lubricating oil flows downwards under gravity. The upper part of the first oil guide groove above the first connecting hole can contain part of the first oil cotton, or it can reach the lubricating oil through diffusion.

[0053] In this embodiment, the first oil guiding structure includes a first oil cotton. The first end of the first oil cotton is located inside the second oil reservoir, and the second end is located inside the needle rod assembly. Using the first oil cotton eliminates the need for dedicated oil pipes and pumping power equipment, thus significantly reducing costs. Specifically, the second end of the first oil cotton is located inside the first oil guiding groove, and an oil cotton tube is located on the circumferential outer side of the first oil cotton between the second oil reservoir and the first connecting hole. The oil cotton tube prevents lubricating oil from evaporating, dripping, or even contaminating other components, and also prevents external forces from easily damaging the first oil cotton.

[0054] In this embodiment, the second oil tank assembly further includes a third oil guiding structure. The needle bar assembly includes an adjustment drive unit and a transmission rod. The transmission rod is rotatably mounted on the sewing machine housing. The adjustment drive unit cooperates with the transmission rod, and the transmission rod cooperates with the needle bar structure. The third oil guiding structure is connected to both the third oil tank and the transmission rod. The third oil guiding structure increases the lubrication range, meaning it can lubricate the transmission rod. It should be noted that the first end of the third oil guiding structure is connected to the interior of the second oil tank, and the second end of the third oil guiding structure can either contact the transmission rod or be suspended and cooperate with it, allowing the lubricating oil to drip or atomize onto the transmission rod.

[0055] like Figures 1 to 3 As shown, in this embodiment, the second oil tank assembly further includes a fourth oil guiding structure. The adjustment drive unit is an adjustment drive motor, which engages with a transmission rod via a bevel gear. The transmission rod engages with the needle bar structure via a transmission gear to achieve axial adjustment of the needle. The fourth oil guiding structure is connected to both the bevel gear and the transmission gear. The inclusion of the fourth oil guiding structure further expands the range of components lubricated using a single oil tank. It should be noted that the adjustment drive motor drives the transmission rod via bevel gears (a driving bevel gear and a driven bevel gear). The rotation of the transmission rod drives the axial movement of the needle bar structure via the transmission gears. The axial direction of the transmission rod is parallel to the axial direction of the needle bar structure.

[0056] like Figure 1 and Figure 2 As shown, in this embodiment, the second oil reservoir is located at the top of the sewing machine housing. This structure saves space inside the sewing machine housing, and the placement of the second oil reservoir ensures better oil flow and lubrication under gravity. It should be noted that the top of the second oil reservoir has three mounting holes, corresponding to the second, third, and fourth oil guiding structures, respectively. The oil filling hole of the second oil reservoir is located on the bottom or side wall. The third oil guiding structure includes a second oil-soaked cotton, and the fourth oil guiding structure includes a third oil-soaked cotton; these details will not be elaborated further.

[0057] In this embodiment, the sewing machine head oil supply mechanism further includes a third oil tank assembly, which in turn includes a third oil tank and a fifth oil guide structure. The fifth oil guide structure is connected to the third oil tank and the needle bar structure. The fifth oil guide structure provides lubrication for the bottom of the needle bar structure. For example, in this embodiment, the needle bar structure includes a threaded sleeve and a threaded rod. The threaded sleeve is appropriately positioned on the circumferential outer side of the threaded rod. The threaded sleeve and the threaded rod are rotatably connected by a thread. The bottom of the threaded rod has a needle mounting seat, and the threaded rod can rotate relative to the needle mounting seat. However, the threaded rod cannot move axially relative to the needle mounting seat; that is, the threaded rod drives the needle mounting seat to move up and down. The needle is mounted on the side of the needle mounting seat away from the threaded rod. A second needle sleeve is also provided on the circumferential outer side of the needle bar structure. The second needle sleeve is lower than the first needle sleeve. For example, the first needle sleeve is mounted on the upper wall of the sewing machine housing, and the second needle sleeve is mounted on the lower wall of the sewing machine housing. The lubricating oil from the fifth oil guide structure lubricates the area between the second needle sleeve and the needle bar structure.

[0058] In this embodiment, the crank disc 41 of the drive needle bar assembly has a hollow lubricating oil receiving space (fifth lubricating oil receiving space 411), and the fifth lubricating oil receiving space 411 has a seventh lubricating oil connecting channel 412 that communicates with the shaft mounting hole. The fifth lubricating oil receiving space 411 is provided by the crank disc 41 itself to lubricate the crank disc 41 and the shaft. It should be noted that this embodiment has two seventh lubricating oil connecting channels 412: one connects the central shaft hole (the shaft for mounting the motor) to the fifth lubricating oil receiving space 411, and the other connects the fifth lubricating oil receiving space 411 to the eccentric shaft hole (the shaft for mounting the connecting rod). The crank disc 41 also has an oil injection hole, which will not be described in detail here.

[0059] The sewing machine includes a sewing machine frame assembly, a sewing head assembly, and a machine housing assembly. The sewing head assembly is located on the upper part of the machine base 50 of the sewing machine frame assembly, and the machine housing assembly is located on the lower part of the machine base 50 of the sewing machine frame assembly. The sewing head assembly includes the aforementioned sewing machine head oil supply mechanism. The sewing machine head assembly of this application has stable lubrication and good lubrication effect.

[0060] The chassis assembly of this application includes a fourth oil reservoir assembly, which is connected to a gear assembly within the chassis assembly. The gear assembly within the chassis assembly includes gears connected to the rotary hook motor and gears on the gear carrier shaft, etc. It should be noted that the lubrication points of the fourth oil reservoir assembly are not limited to the aforementioned gears; for example, they may include the shaft connected to the gear carrier shaft via an oil guiding structure.

[0061] It should be noted that the sewing machine head assembly of this application includes a needle motor and a needle drive shaft. The needle motor is connected to the needle drive shaft, which in turn cooperates with the needle bar assembly and drives the needle bar assembly. The machine housing assembly includes a shuttle motor and a shuttle shaft. The shuttle motor is connected to the shuttle shaft and drives the shuttle shaft. In other words, one embodiment of the sewing machine of this application involves the needle and shuttle being driven by two independent motors, thus making the sewing machine head assembly and machine housing assembly independent (electrically connected, ensuring the coordination of the needle motor and shuttle motor). Structurally, in this embodiment, the two rotating shafts of the sewing machine are significantly shortened, resulting in less bending deformation and thus higher transmission accuracy.

[0062] The sewing machine of this application lubricates the spline shaft section with lubricating oil inside the rotary hook rod and the like; and with oiled cotton.

[0063] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0064] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0065] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A sewing machine, characterized in that, include: A rotary shuttle shaft assembly (10) includes a rotary shuttle axial movement structure (11), a rotary shuttle shaft structure (12), and a toothed frame shaft structure (13). The rotary shuttle axial movement structure (11) is connected to the rotary shuttle shaft structure (12), and the toothed frame shaft structure (13) cooperates with the rotary shuttle shaft structure (12). The rotary shuttle shaft structure (12) includes a splined rotary shuttle shaft (121) and a splined bushing (122). The splined bushing (122) is sleeved on the circumferential outer side of the splined rotary shuttle shaft (121). The splined rotary hook shaft (121) has a hollow first lubricating oil receiving space (1211) and a first lubricating oil connecting channel (1212). The first lubricating oil connecting channel (1212) is disposed on the side wall of the splined rotary hook shaft (121) and connects the first lubricating oil receiving space (1211) and the outside of the splined rotary hook shaft (121). The outlet of the first lubricating oil connecting channel (1212) is located in the splined shaft section of the splined rotary hook shaft (121). The splined bushing (122) is correspondingly disposed in the splined shaft section of the splined rotary hook shaft (121). The tooth frame shaft structure (13) includes a tooth frame crankshaft (131) and a tooth frame connecting rod (132). The tooth frame crankshaft (131) is sleeved on the circumferential outer side of the spline bushing (122). The tooth frame connecting rod (132) is rotatably sleeved on the circumferential outer side of the tooth frame crankshaft (131). The spline bushing (122) has a second lubricating oil communication channel (1221) that passes through the side wall of the spline bushing (122). The second lubricating oil communication channel (1221) is correspondingly provided with the tooth frame crankshaft (131). The tooth frame connecting rod (132) has a third lubricating oil connecting channel (1321), a fourth lubricating oil connecting channel (1322), and a hollow second lubricating oil receiving space (1323). The third lubricating oil connecting channel (1321) connects the second lubricating oil receiving space (1323) and the first rotating collar of the tooth frame connecting rod (132). The fourth lubricating oil connecting channel (1322) connects the second lubricating oil receiving space (1323) and the second rotating collar of the tooth frame connecting rod (132).

2. The sewing machine according to claim 1, characterized in that, The cross-sectional area of ​​the second lubricating oil connecting channel (1221) is larger than the cross-sectional area of ​​the first lubricating oil connecting channel (1212).

3. The sewing machine according to claim 1, characterized in that, The inner wall of the splined rotary shaft (121) is an inclined wall surface. The inner wall of the splined rotary shaft (121) corresponding to the first lubricating oil connecting channel (1212) gradually decreases from the first lubricating oil connecting channel (1212) to both sides of the splined rotary shaft (121).

4. The sewing machine according to claim 1, characterized in that, The tooth frame shaft structure (13) also includes a tooth frame shaft (133), which has a hollow third lubricating oil receiving space (1331) and a fifth lubricating oil connecting channel (1332) that penetrates the side wall of the tooth frame shaft (133).

5. The sewing machine according to claim 1, characterized in that, The axial moving structure (11) of the rotary hook includes a pull plate (111), the pull plate (111) has a rotary hook shaft mounting hole (1111), the rotary hook shaft mounting hole (1111) is rotatably installed in the rotary hook shaft mounting hole (1111) of the pull plate (111), the pull plate (111) has a sixth lubricating oil connecting channel (1112) and a hollow fourth lubricating oil containing space (1113), the sixth lubricating oil connecting channel (1112) connects the fourth lubricating oil containing space (1113) and the rotary hook shaft mounting hole (1111).

6. The sewing machine according to claim 1, characterized in that, The sewing machine also includes a first lubricating oil tank (20) and a first oil guiding structure (30), the first oil guiding structure (30) connecting the interior of the first lubricating oil tank (20) and the toothed shaft structure (13).

7. The sewing machine according to claim 1, characterized in that, The sewing machine also includes a head assembly (40), which includes a crank disc (41) having a fifth lubricating oil receiving space (411) and a seventh lubricating oil connecting channel (412) that connects the crank disc (41) to the shaft mounting hole of the crank disc (41) and the fifth lubricating oil receiving space (411).

8. A lubrication method for a sewing machine, characterized in that, The sewing machine is the sewing machine according to any one of claims 1 to 7, and the lubrication method of the sewing machine includes: The spline shaft section is lubricated by the lubricating oil inside the rotary hook itself; Oiled cotton is used for lubrication.

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