A sewing machine shuttle
By setting an oil storage chamber and an oil guide hole in the outer shuttle of the rotary hook, and using a sponge block to store lubricating oil and guide it to the rotating connection, the wear problem caused by lack of lubrication of the outer and inner shuttles is solved, and a longer service life is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO YINZHOU YONGYAO SEWING MACHINERY
- Filing Date
- 2025-07-24
- Publication Date
- 2026-07-21
AI Technical Summary
The lack of lubrication in the outer and inner shuttles of the existing rotary hooks during rotation leads to an increased coefficient of friction, resulting in greater wear and reduced service life.
An oil storage chamber and an oil guide hole are set in the outer shuttle of the rotary hook. A sponge block is used to store lubricating oil, and the lubricating oil is guided to the rotating connection through the filling cylinder to ensure the lubrication of the outer and inner shuttles.
It reduces the friction coefficient of the rotary hook, avoids wear on the outer and inner hooks, and extends its service life.
Smart Images
Figure CN224531230U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of rotary hook structures, and in particular to a sewing machine rotary hook. Background Technology
[0002] Rotary hooks are an important component of sewing machines. Among sewing equipment, lockstitch sewing machines are the most common. Most of these sewing machines use rotary hooks, with the tip of the hook hooking the loop, expanding the loop, and guiding the loop around the bobbin to form a lockstitch.
[0003] The existing announcement number is CN211771941U, entitled "A Novel Sewing Machine Rotary Hook," which includes a shuttle case, a rotary hook body, and a rotary hook thread hook. The rotary hook body is located above the shuttle case, and a rotary hook fastening screw is located on the outer side of the rotary hook body. A needle hole is provided on the outer wall of the rotary hook body, and the rotary hook thread hook is located inside the needle hole. A housing fixing screw is provided on the outer wall of the shuttle case. A rotary hook spindle is located at the center of the rotary hook body, and a sewing machine needle is located above the needle hole. A positioning pin is provided on the side of the rotary hook body near the shuttle case. A snap-fit block is provided on the side, and an arc groove is provided on the end face of the snap-fit block. A pin hole and a sliding groove are provided on the end face of the shuttle case near the shuttle body. Thermally conductive silicone is provided in the pin hole, and a ball is provided in the sliding groove. By setting up the positioning pin, pin hole, sliding groove, ball, and snap-fit block, the shuttle and shuttle case can be positioned for installation. When relative displacement occurs, sliding friction can be converted into rolling friction. The manganese brass material of the shuttle and the setting of thermally conductive silicone can effectively improve the heat conduction of the shuttle, avoid heat concentration, effectively extend the service life of the shuttle, and ensure sewing quality.
[0004] Regarding the aforementioned technologies, the inventors discovered that in order to reduce friction during later rotation, ball bearings are installed on the outer and inner shuttles of the rotary hook to reduce friction. However, the outer and inner shuttles lack a lubrication supply device. When the outer and inner shuttles of the rotary hook rotate, the lack of lubrication leads to an increase in the coefficient of friction, resulting in greater wear on the outer and inner shuttles and a reduced lifespan. Utility Model Content
[0005] In order to overcome the problem that the lack of lubrication during the rotation of the outer and inner shuttles of existing rotary hooks leads to an increase in the coefficient of friction, resulting in greater wear of the outer and inner shuttles and a reduced lifespan, this application provides a sewing machine rotary hook.
[0006] The sewing machine rotary hook provided in this application adopts the following technical solution: A sewing machine shuttle includes an outer shuttle and an inner shuttle. The inner shuttle is disposed inside the shuttle shell of the outer shuttle. A shuttle tube is horizontally connected and fixed at one end of the shuttle shell of the outer shuttle. The shuttle tube is hollow and has an oil storage cavity. One end of the shuttle tube is open and a cover plate is assembled at the open end of the shuttle tube. An filling cylinder is vertically connected and fixed on the upper side of the outer circumference surface of the shuttle tube. The oil storage cavity of the shuttle tube is filled with a sponge block. Multiple oil guide holes are evenly opened through the inner wall of the shuttle shell of the outer shuttle on the other end face of the oil storage cavity of the shuttle tube.
[0007] By adopting the above technical solution, in order to ensure the lubrication of the outer shuttle rotating on the inner shuttle during use, firstly, the cover plate at one end of the outer shuttle tube is disassembled, then a sponge block is filled into the oil storage cavity of the outer shuttle tube, and then the cover plate is assembled at the open end of the outer shuttle tube. Lubricating oil is then guided into the oil storage cavity of the outer shuttle tube through a filling cylinder. The lubricating oil is stored and soaked in the sponge block. Later, when the outer shuttle rotates on the inner shuttle, the rotational force causes the lubricating oil in the sponge block in the oil storage cavity of the shuttle tube to flow into the interior of the outer shuttle tube through multiple oil guide holes opened on the inner wall of the outer shuttle shell, thus lubricating... Oil flows into the rotating connection between the outer and inner shuttles, providing rotational lubrication for both. The filling cylinders on the outer and inner shuttles guide the lubricating oil into the sponge block in the oil storage chamber. The rotational force causes the lubricating oil in the sponge block in the oil storage chamber to flow through multiple oil guide holes on the inner wall of the outer shuttle's shell into the inner tube of the outer shuttle. The lubricating oil then flows into the rotating connection between the outer and inner shuttles, providing rotational lubrication for both. This lubrication reduces the coefficient of friction during the rotation of the outer and inner shuttles, thus preventing excessive wear and ensuring their lifespan.
[0008] Optionally, the inner shuttle includes a shaft core and a shuttle frame. The shaft core is horizontally arranged inside the outer shuttle's shuttle case, and the shuttle frame is horizontally arranged outside the shaft core. A guide rail is fixed on the outer wall of the shuttle frame.
[0009] By adopting the above technical solution, the shaft core of the inner shuttle is horizontally set inside the outer shuttle's shuttle case to guide the outer shuttle to rotate on the inner shuttle. A guide rail is fixed on the outer wall of the shuttle frame to facilitate the later guidance of the outer shuttle to rotate on the inner shuttle.
[0010] Optionally, a rail groove is provided on the inner wall of the outer shuttle's shuttle case, and the rail groove is rotatably connected to the guide rail on the inner shuttle.
[0011] By adopting the above technical solution, the guide rail on the inner shuttle is rotatably connected to the rail groove opened on the inner wall of the outer shuttle's shuttle case, and the horizontal rotation guides the outer shuttle to rotate on the inner shuttle.
[0012] Optionally, an oil guide column is vertically installed inside the filling cylinder, and a spring is vertically sleeved on the outside of the oil guide column, with the two ends of the spring fixed to the top surface of the oil guide column and the bottom of the inner wall of the filling cylinder, respectively.
[0013] By adopting the above technical solution, the oil guide column is vertically installed inside the filling cylinder to connect with the oil injector. When filling, the oil guide column is squeezed downward and moves vertically inside the filling cylinder, compressing the spring deformation. The bottom end of the oil guide column is inserted downward into the oil storage cavity of the shuttle cylinder. The oil guide column connects with the oil injector to guide the lubricating oil into the oil storage cavity of the shuttle cylinder for storage.
[0014] Optionally, the bottom end of the oil guide cylinder is vertically provided with a perforated cylinder, and the bottom end of the oil guide cylinder is connected and fixed to the top end of the perforated cylinder.
[0015] By adopting the above technical solution, multiple oil outlet holes are evenly opened on the outer circumference of the fixed orifice at the bottom end of the oil guide cylinder. When refueling, the oil guide cylinder is squeezed downwards and moves vertically inside the filling cylinder, compressing the spring deformation. The bottom orifice of the oil guide cylinder is inserted downwards into the oil storage cavity of the shuttle cylinder. Then, the lubricating oil is discharged from the multiple oil outlet holes of the orifice into the oil storage cavity of the shuttle cylinder, completing the refueling operation of the shuttle cylinder.
[0016] Optionally, multiple elastic frames are evenly fixed on one side of the inner wall of the oil storage chamber of the shuttle tube near the opening port, and multiple pressure grooves are evenly and horizontally opened on the cover plate, with each pressure groove corresponding to and inserted into one of the multiple elastic frames.
[0017] By adopting the above technical solution, the cover plate is inserted into the inner wall of the oil storage cavity of the shuttle tube near the opening port. The pressure groove on the cover plate squeezes and deforms multiple elastic frames. The deformation force of the multiple elastic frames is used to press the pressure groove on the cover plate to maintain the stability of the cover plate installed on the inner wall of the oil storage cavity of the shuttle tube near the opening port.
[0018] Optionally, a thread inlet groove is provided through the shuttle shell of the outer shuttle, and a hook head is fixed on one side of the thread inlet groove on the shuttle shell of the outer shuttle, and an assembly piece is fixed on the other side of the thread inlet groove on the shuttle shell of the outer shuttle.
[0019] By adopting the above technical solution, the hook head on one side of the inlet groove on the outer shuttle is used to hook the wire bundle, while an assembly piece is fixed on the other side of the inlet groove on the outer shuttle, which facilitates the assembly and replacement of the shuttle skin.
[0020] Optionally, the assembly piece is provided with a shuttle skin, and the shuttle skin is fixed to the assembly piece by screws.
[0021] By adopting the above technical solution, the shuttle skin is fixedly assembled onto the assembly piece with screws, which facilitates the later disassembly and replacement of the shuttle skin.
[0022] In summary, this application includes at least one of the following beneficial technical effects: To ensure lubrication of the outer shuttle rotating on the inner shuttle during use, the cover plate at one end of the outer shuttle's tube is first disassembled. Then, a sponge block is filled into the oil storage cavity of the outer shuttle's tube. The cover plate is then assembled at the open end of the outer shuttle's tube. Lubricating oil is guided into the oil storage cavity of the outer shuttle's tube through a filling cylinder. The lubricating oil is stored and soaked in the sponge block. Later, when the outer shuttle rotates on the inner shuttle, the rotational force causes the lubricating oil in the sponge block within the oil storage cavity of the tube to flow into the interior of the outer shuttle's tube through multiple oil guide holes opened on the inner wall of the outer shuttle's shell. Then, the lubricating oil flows into the rotating connection between the outer and inner shuttles, providing rotational lubrication for both. The filling cylinders on the outer and inner shuttles guide the lubricating oil into the sponge block in the oil storage chamber. The rotational force causes the lubricating oil in the sponge block in the oil storage chamber to flow through multiple oil guide holes on the inner wall of the outer shuttle's shell into the inner tube of the outer shuttle. The lubricating oil then flows into the rotating connection between the outer and inner shuttles, providing rotational lubrication for both. This reduces the friction coefficient caused by insufficient lubrication during the rotation of the outer and inner shuttles, thus preventing excessive wear and ensuring their lifespan. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.
[0024] Figure 2 This is a schematic diagram of the overall structure of the embodiment of this application in an exploded state; Figure 3 This is a schematic diagram of the external shuttle in the disassembled state according to an embodiment of this application; Figure 4 This is a schematic diagram of the shuttle in the disassembled state according to an embodiment of this application; Figure 5 This is a schematic diagram of the internal shuttle in the disassembled state in an embodiment of this application.
[0025] Explanation of reference numerals in the attached drawings: 1. Outer shuttle; 11. Shuttle cylinder; 111. Oil storage chamber; 112. Elastic frame; 113. Cover plate; 114. Pressure groove; 12. Rail groove; 13. Wire inlet groove; 14. Wire hook head; 15. Assembly piece; 16. Shuttle skin; 17. Sponge block; 18. Filling cylinder; 19. Oil guide cylinder column; 191. Hole cylinder; 192. Spring; 193. Oil guide hole; 2. Inner shuttle; 21. Shaft core; 22. Shuttle frame; 23. Guide rail. Detailed Implementation
[0026] The present application will be further described in detail below with reference to the accompanying drawings.
[0027] This application discloses a sewing machine rotary hook. (Refer to...) Figure 1 , Figure 2 , Figure 3 and Figure 4 A sewing machine rotary shuttle includes an outer shuttle 1 and an inner shuttle 2. The inner shuttle 2 is disposed inside the shuttle shell of the outer shuttle 1. A shuttle cylinder 11 is horizontally connected and fixed at one end of the shuttle shell of the outer shuttle 1. The shuttle cylinder 11 is hollow and has an oil storage cavity 111. One end of the shuttle cylinder 11 is open and a cover plate 113 is assembled at the open end of the shuttle cylinder 11. An filling cylinder 18 is vertically connected and fixed on the upper side of the outer circumference surface of the shuttle cylinder 11. The oil storage cavity 111 of the shuttle cylinder 11 is filled with a sponge block 17. Multiple oil guide holes 193 are evenly opened through the inner wall of the shuttle shell of the outer shuttle 1 on the other end face of the oil storage cavity 111 of the shuttle cylinder 11.
[0028] By adopting the above technical solution, in order to ensure the lubrication of the outer shuttle 1 rotating on the inner shuttle 2 during use, the cover plate 113 at one end of the shuttle cylinder 11 of the outer shuttle 1 is first disassembled, and then the sponge block 17 is filled into the oil storage cavity 111 of the shuttle cylinder 11 of the outer shuttle 1. Then, the cover plate 113 is assembled at the open end of the shuttle cylinder 11 of the outer shuttle 1. The lubricating oil is guided into the oil storage cavity 111 of the shuttle cylinder 11 of the outer shuttle 1 through the filling cylinder 18. The lubricating oil is stored in the sponge block 17. Later, when the outer shuttle 1 rotates on the inner shuttle 2, the rotational force causes the lubricating oil in the sponge block 17 in the oil storage cavity 111 of the shuttle cylinder 11 to flow into the inner shuttle cylinder 11 of the outer shuttle 1 through multiple oil guide holes 193 opened on the inner wall of the shuttle shell of the outer shuttle 1. The lubricating oil flows into the rotating connection between the outer shuttle 1 and the inner shuttle 2, providing rotational lubrication for both. The filling cylinder 18 of the outer shuttle 1 and the inner shuttle 2 guides the lubricating oil into the sponge block 17 in the oil storage chamber 111. The rotational force causes the lubricating oil in the sponge block 17 in the oil storage chamber 111 to flow into the interior of the outer shuttle 1's cylinder 11 through multiple oil guide holes 193 on the inner wall of the outer shuttle 1's shell. The lubricating oil then flows into the rotating connection between the outer shuttle 1 and the inner shuttle 2, providing rotational lubrication for both. This reduces the friction coefficient caused by insufficient lubrication during the rotation of the outer shuttle 1 and the inner shuttle 2, thus preventing excessive wear on the outer and inner shuttles and ensuring their lifespan.
[0029] Reference Figure 3 and Figure 5 The inner shuttle 2 includes a shaft core 21 and a shuttle frame 22. The shaft core 21 is horizontally disposed inside the shuttle shell of the outer shuttle 1, and the shuttle frame 22 is horizontally disposed outside the shaft core 21. A guide rail 23 is fixed on the outer wall of the shuttle frame 22. The shaft core 21 of the inner shuttle 2 is horizontally disposed inside the shuttle shell of the outer shuttle 1 to guide the outer shuttle 1 to rotate on the inner shuttle 2. The guide rail 23 is fixed on the outer wall of the shuttle frame 22 to facilitate the subsequent rotation of the outer shuttle 1 on the inner shuttle 2. A rail groove 12 is opened on the inner wall of the shuttle shell of the outer shuttle 1, and the rail groove 12 is rotatably connected to the guide rail 23 on the inner shuttle 2. The rail groove 12 opened on the inner wall of the shuttle shell of the outer shuttle 1 is rotatably connected to the guide rail 23 on the inner shuttle 2, and the horizontal rotation guides the outer shuttle 1 to rotate on the inner shuttle 2.
[0030] Reference Figure 4 An oil guide column 19 is vertically installed inside the filling cylinder 18, and a spring 192 is vertically sleeved on the outside of the oil guide column 19. The two ends of the spring 192 are fixed to the top surface of the oil guide column 19 and the bottom of the inner wall of the filling cylinder 18, respectively. The vertically installed oil guide column 19 inside the filling cylinder 18 is used to connect with the fuel injector. During refueling, the oil guide column 19 is pressed downwards and moves vertically inside the filling cylinder 18, compressing the spring 192. The bottom end of the oil guide column 19 is inserted downwards into the oil storage chamber 111 of the shuttle cylinder 11, using the connection between the oil guide column 19 and the fuel injector to guide lubricating oil into the oil storage chamber 111 of the shuttle cylinder 11. A perforated cylinder 191 is vertically installed at the bottom end of the oil guide column 19, and the bottom end of the oil guide column 19 is connected and fixed to the top end of the perforated cylinder 191. The bottom end of the oil guide cylinder 19 is connected to a fixed orifice 191 with multiple oil outlet holes evenly distributed on its outer circumference. When refueling, the oil guide cylinder 19 is squeezed downwards and moves vertically inside the filling cylinder 18, compressing the spring 192 and deforming it. The bottom end of the oil guide cylinder 19, the orifice 191, is inserted downwards into the oil storage chamber 111 of the shuttle cylinder 11. Then, the lubricating oil is discharged from the multiple oil outlet holes of the orifice 191 into the oil storage chamber 111 of the shuttle cylinder 11, completing the refueling operation of the shuttle cylinder 11.
[0031] Reference Figure 4 Multiple elastic frames 112 are evenly fixed to one side of the inner wall of the oil storage cavity 111 of the shuttle cylinder 11 near the opening port. Multiple pressure grooves 114 are evenly and horizontally opened on the cover plate 113, and the multiple pressure grooves 114 are inserted into the multiple elastic frames 112 one by one. The cover plate 113 is inserted into the inner wall of the oil storage cavity 111 of the shuttle cylinder 11 near the opening port. The pressure grooves 114 on the cover plate 113 compress the multiple elastic frames 112 to deform. The deformation force of the multiple elastic frames 112 is used to press the pressure grooves 114 on the cover plate 113 to maintain the stability of the cover plate 113 installed on the inner wall of the oil storage cavity 111 of the shuttle cylinder 11 near the opening port.
[0032] Reference Figure 3The outer shuttle 1 has a thread inlet groove 13 extending through its shuttle case. A hook head 14 is fixed to one side of the thread inlet groove 13, and an assembly piece 15 is fixed to the other side. The hook head 14 on one side of the thread inlet groove 13 is used to hook the thread bundle, while the assembly piece 15 on the other side facilitates the assembly and replacement of the shuttle skin 16. The shuttle skin 16 is mounted on the assembly piece 15, and the shuttle skin 16 and the assembly piece 15 are fixed together by screws. The bobbin skin 16 is fixedly assembled onto the assembly piece 15 with screws, facilitating later disassembly and replacement of the bobbin skin 16. Meanwhile, the outer bobbin 1 and the inner bobbin 2 are made of manganese brass. Due to its good mechanical properties, corrosion resistance and machinability, manganese brass alloy improves the service life of the outer bobbin 1 and the inner bobbin 2. The hook head 14 of the outer bobbin 1 and the surface of the bobbin skin 16 are all coated with a wear-resistant coating made of nickel-based alloy, which improves the corrosion resistance and wear resistance of the hook head 14 and the bobbin skin 16 and their service life. The bobbin shell of the outer bobbin 1 is made of manganese brass. Manganese brass alloy is good for its mechanical properties, corrosion resistance and machinability.
[0033] The implementation principle of a sewing machine rotary hook according to an embodiment of this application is as follows: In order to ensure the lubrication of the outer shuttle 1 rotating on the inner shuttle 2 during use, the cover plate 113 at one end of the shuttle cylinder 11 of the outer shuttle 1 is first disassembled, and then the sponge block 17 is filled into the oil storage cavity 111 of the shuttle cylinder 11 of the outer shuttle 1. The bottom end of the oil guide cylinder 19 is connected to the fixed orifice 191, which has multiple oil outlet holes evenly opened on its outer circumference. When adding oil, the oil guide cylinder 19 is squeezed downward to move vertically inside the filling cylinder 18, and the compression spring 192 is deformed. The bottom end orifice 191 of the oil guide cylinder 19 is inserted downward into the oil storage cavity 111 of the shuttle cylinder 11, and then the lubricating oil is discharged from the multiple oil outlet holes of the orifice 191. Inside the oil storage chamber 111 of the shuttle tube 11, the oiling operation of the shuttle tube 11 is completed. Then, the cover plate 113 is assembled at the open end of the shuttle tube 11 of the outer shuttle 1. The lubricating oil is guided into the oil storage chamber 111 of the shuttle tube 11 of the outer shuttle 1 through the filling cylinder 18. The lubricating oil is stored in the sponge block 17. Later, when the outer shuttle 1 rotates on the inner shuttle 2, the rotational force causes the lubricating oil in the sponge block 17 in the oil storage chamber 111 of the shuttle tube 11 to flow into the interior of the shuttle tube 11 of the outer shuttle 1 through multiple oil guide holes 193 opened on the inner wall of the shuttle shell of the outer shuttle 1. Then, the lubricating oil flows into the rotational connection between the outer shuttle 1 and the inner shuttle 2 to provide rotational lubrication for the outer shuttle 1 and the inner shuttle 2.
[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A sewing machine rotary hook, characterized in that, The device includes an outer shuttle (1) and an inner shuttle (2). The inner shuttle (2) is provided inside the shuttle shell of the outer shuttle (1). A shuttle cylinder (11) is horizontally connected and fixed at one end of the shuttle shell of the outer shuttle (1). An oil storage cavity (111) is provided inside the hollow shuttle cylinder (11). One end of the shuttle cylinder (11) is open. A cover plate (113) is assembled at the open end of the shuttle cylinder (11). An filling cylinder (18) is vertically connected and fixed on the upper side of the outer circumference surface of the shuttle cylinder (11). A sponge block (17) is filled in the oil storage cavity (111) of the shuttle cylinder (11). Multiple oil guide holes (193) are evenly opened through the inner wall of the shuttle shell of the outer shuttle (1) on the other end face of the oil storage cavity (111) of the shuttle cylinder (11).
2. A sewing machine rotary hook according to claim 1, characterized in that: The inner shuttle (2) includes a shaft core (21) and a shuttle frame (22). The shaft core (21) is horizontally arranged inside the shuttle shell of the outer shuttle (1), and the shuttle frame (22) is horizontally arranged outside the shaft core (21). A guide rail (23) is fixed on the outer wall of the shuttle frame (22).
3. A sewing machine rotary hook according to claim 2, characterized in that: The outer shuttle (1) has a rail groove (12) on the inner wall of the shuttle shell, and the rail groove (12) is rotatably connected to the guide rail (23) on the inner shuttle (2).
4. A sewing machine rotary hook according to claim 1, characterized in that: The filling cylinder (18) is vertically provided with an oil guide column (19), and a spring (192) is vertically sleeved on the outside of the oil guide column (19). The two ends of the spring (192) are respectively fixed to the top surface of the oil guide column (19) and the bottom of the inner wall of the filling cylinder (18).
5. A sewing machine rotary hook according to claim 4, characterized in that: The bottom end of the oil guide cylinder (19) is vertically provided with a perforated cylinder (191), and the bottom end of the oil guide cylinder (19) is connected to and fixed to the top end of the perforated cylinder (191).
6. A sewing machine rotary hook according to claim 1, characterized in that: Multiple elastic frames (112) are evenly fixed on one side of the inner wall of the oil storage cavity (111) of the shuttle cylinder (11) near the opening port. Multiple pressure grooves (114) are evenly and horizontally opened on the cover plate (113), and the multiple pressure grooves (114) are inserted into the multiple elastic frames (112) one by one.
7. A sewing machine rotary hook according to claim 1, characterized in that: The outer shuttle (1) has a thread inlet groove (13) through it, and a hook head (14) is fixed on one side of the thread inlet groove (13) on the outer shuttle (1), and an assembly piece (15) is fixed on the other side of the thread inlet groove (13) on the outer shuttle (1).
8. A sewing machine rotary hook according to claim 7, characterized in that: The assembly piece (15) is provided with a shuttle skin (16), and the shuttle skin (16) and the assembly piece (15) are fixedly assembled by screws.