A lubricating device for a sewing machine

Abstract

The application provides a lubricating device of a sewing machine and belongs to the technical field of sewing machines. The lubricating device of the sewing machine solves the problem of poor oil supply effect of the existing lubricating device. The lubricating device of the sewing machine comprises a rack base plate, a machine shell bottom plate arranged on the rack base plate, a rotating shuttle seat connected with the machine shell bottom plate and located below the machine shell bottom plate, a needle bar swing frame connected above the machine shell bottom plate, and a transmission assembly connected with the needle bar swing frame. The transmission assembly comprises a feeding connecting rod for driving the needle bar swing frame to swing. The lubricating device comprises an oil pump connected with the machine shell bottom plate, an oil pump leaf spring arranged on the oil pump and linked with the feeding connecting rod to realize oil pumping, an oil quantity control assembly connected with an oil outlet end of the oil pump and capable of controlling the maximum output oil flow, an oil pipe I and an oil pipe II connected with an oil outlet end of the oil quantity control assembly, and an oil outlet of the oil pipe I located on the rotating shuttle seat. The lubricating device of the sewing machine can not only improve the oil supply effect of the lubricating device but also not affect the sewing of the sewing machine when the rotating speed is high.

Description

Technical Field

[0001] This invention belongs to the field of sewing machine technology and relates to a lubrication device for a sewing machine. Background Technology

[0002] In most sewing machines, especially industrial sewing machines, the needle bar swing frame and rotary hook move at high speeds during the sewing process. Therefore, traditional sewing machines usually have oil boxes in places that require lubrication to supply oil to the corresponding parts. However, the oil boxes need to be constantly filled with oil during use, which makes the sewing machine inconvenient to use and also results in insufficient or uneven lubrication during the lubrication process.

[0003] Therefore, people have developed oil circuit lubrication devices for sewing machines. For example, Chinese patent application [Authorization Announcement No.: CN201071441Y] discloses an oil circuit lubrication system for sewing machines. The system includes an oil supply line and an oil return line. An oil supply pump is connected in series on the oil supply line. The oil supply pump is connected to an oil outlet line and an oil inlet line. The other end of the oil inlet line is connected to an oil pan for storing lubricating oil. An oil return pump is also provided in the oil outlet line. The oil outlet line of the oil return pump is connected to the oil pan.

[0004] The above structure simply places the oil pump at the bottom and utilizes the height difference to achieve a small amount of oil supply to the needle bar swing frame and a large amount of oil supply to the rotary hook. However, in use, the oil supply to the needle bar swing frame needs to be adjusted according to the usage conditions. The faster the needle bar swing frame and rotary hook rotate, the more oil is needed. The above structure cannot achieve different oil supply according to different speeds, thus resulting in poor oil supply effect of the sewing machine. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a lubrication device for sewing machines. The technical problem to be solved by this invention is: how to solve the problem of poor oil supply effect in existing lubrication devices.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A lubrication device for a sewing machine, the sewing machine including a frame plate, a base plate disposed on the frame plate, and a shuttle seat connected to and located below the base plate. A needle bar swing frame and a transmission assembly connected to the needle bar swing frame are connected above the base plate. The transmission assembly includes a feeding linkage that drives the needle bar swing frame to swing. The lubrication device is characterized by including an oil pump connected to the base plate, an oil pump leaf spring on the oil pump that is linked to the feeding linkage and realizes oil pumping, and an oil quantity control assembly connected to the oil pump's outlet end to control the maximum output oil flow rate. The oil quantity control assembly's outlet end is connected to an oil pipe one and an oil pipe two. The oil outlet of oil pipe one is located on the shuttle seat, and the oil outlet of oil pipe two is located on the needle bar swing frame. The oil quantity control assembly is disposed below the base plate and close to the shuttle seat.

[0008] Working Principle: During the sewing process, the transmission assembly drives the needle bar swing frame to swing, while the feed linkage of the transmission assembly reciprocates up and down. The oil pump leaf spring on the oil pump, in conjunction with the feed linkage, pumps oil. After the oil pump draws in oil, it flows from the oil pump outlet to the oil volume control assembly. The oil volume control assembly controls the maximum output oil flow rate. Therefore, oil pipe one and oil pipe two are connected to the oil volume control assembly's outlet. Since the needle bar swing frame is located above the machine housing base plate, while the rotary hook is located below the machine housing base plate, and the rotary hook requires a large amount of oil, the oil volume control assembly is placed below the machine housing base plate and close to the rotary hook. This allows the oil to be quickly supplied to the rotary hook through oil pipe one during the initial oil pumping. The second oil pipe extends from the bottom plate of the machine casing to the needle bar swing frame on the bottom plate. During sewing, a small amount of oil is supplied to the needle bar swing frame through the height difference. The above structure controls the pumping speed of the oil pump through the feeding linkage, so that the oil supply to the needle bar swing frame and the rotary hook can be adjusted according to their operating speed, thus improving the timeliness of the overall oil supply. In addition, an oil quantity control component is set to control the maximum oil output of the oil pump, so as to avoid excessive lubricating oil accumulation at the rotary hook and needle bar swing frame when the speed is too fast, which would affect the sewing. Thus, the lubrication device not only improves its oil supply effect, but also ensures that the sewing machine does not affect the sewing when the speed is high.

[0009] In the above-mentioned lubrication device for a sewing machine, the oil pump includes an oil pump housing and an oil pump baffle connected to the oil pump housing. The oil pump leaf spring always abuts against the oil pump baffle. The oil pump housing and the oil pump baffle together form a sealed oil pump chamber. An oil pump gasket is provided inside the oil pump housing and located within the oil pump chamber. An oil inlet pipe and an oil outlet pipe are provided on the oil pump housing. The oil pump includes a one-way valve 1 that controls the connection or disconnection between the oil pump chamber and the oil inlet pipe, and a one-way valve 2 that controls the connection or disconnection between the oil pump chamber and the oil outlet pipe. The connection directions of one-way valve 1 and one-way valve 2 are opposite. An elastic element is provided between the oil pump gasket and the oil pump baffle. The elastic element can push the oil pump baffle to reset and open one-way valve 1 and close one-way valve 2. When the oil pump leaf spring moves downward and drives the oil pump baffle downward, one-way valve 1 closes and one-way valve 2 opens. By configuring a sealed oil pump chamber and using check valves one and two, when the oil pump leaf spring pushes down the oil pump baffle, check valve one closes and check valve two opens, closing the inlet pipe and opening the outlet pipe, allowing oil to be discharged from the oil pump through the outlet pipe. When the elastic element pushes the oil pump baffle to reset and causes the oil pump leaf spring to reset, the liquid volume in the oil pump chamber remains unchanged, but the space of the oil pump chamber increases. At this time, a negative pressure is formed in the oil pump chamber, opening check valve one and closing check valve two, opening the inlet pipe and closing the outlet pipe, thus enabling oil to enter the oil pump chamber and pumping oil. Through the configuration of check valve one, check valve two, elastic element, and oil pump leaf spring, the oil pumping speed is increased, and oil suction and supply can be achieved with the movement of the feeding connecting rod and elastic element, resulting in a faster and better oil supply effect of the lubrication device.

[0010] In the above-mentioned lubrication device for a sewing machine, the oil quantity control component includes an oil reservoir housing with a receiving cavity. The upper end of the receiving cavity has an oil inlet, and the lower end of the receiving cavity has an oil outlet. A float ball is provided in the receiving cavity to block the oil outlet. An oil inlet sleeve is inserted into the oil reservoir housing at the oil inlet. The oil inlet sleeve has an oil passage hole that allows the oil pump's oil outlet to communicate with the receiving cavity. A pin is slidably connected to the oil inlet sleeve. The float ball can float upward and push the pin upward to block the oil passage hole. Oil flows into the receiving cavity through the oil inlet hole. At this time, the oil has a certain buoyancy. When the oil is low, the float remains floating and does not push the pin upward. However, when too much oil flows into the receiving cavity, the float gradually rises with the oil level, pushing the pin upward. At this point, the pin blocks the oil inlet hole of the oil inlet until the lubricating oil flows out. Then, the float lowers until the pin moves downward under gravity, opening the oil inlet hole. Only then can the lubricating oil continue to enter the receiving cavity through the oil inlet hole. This structure utilizes the buoyancy of the oil to float the float and push the pin upward, ensuring a relatively stable flow rate of oil from the oil outlet. Furthermore, when the oil has finished flowing out, the float blocks the oil outlet, controlling the maximum oil flow rate of the oil reservoir shell. This prevents excessive oil supply to the rotary hook and needle bar swing frame, which would cause oil to drip onto the sewn fabric during sewing, thus improving the lubrication stability of the lubrication device.

[0011] In the aforementioned lubrication device for a sewing machine, a vertical mounting groove is provided on the shuttle seat. The groove opening faces upward and extends through the upper end face of the shuttle seat. A base block and a clamping block threadedly connected to the shuttle seat and positioned on the base block are provided within the mounting groove. The base block is located at the bottom of the mounting groove, and an oil pipe is positioned between the base block and the clamping block. By providing a mounting groove on the shuttle seat, a base block at the bottom of the groove, and a clamping block threadedly connected to the shuttle seat within the mounting groove, the relative displacement between the clamping block and the base block can be adjusted by rotating the clamping block thread. This allows for adjustment of the oil supply to the shuttle seat via the pressure of the oil pipe, making oil quantity adjustment more convenient and improving the lubrication effect of the lubrication device.

[0012] In the above-mentioned lubrication device for the sewing machine, the rotary hook seat is also provided with an annular oil supply ring, and an annular oil supply groove is opened on the oil supply ring. The end of the oil pipe is embedded in the oil supply groove. A rotary hook housing with a rotary hook slide rail is connected to the rotary hook seat. The rotary hook housing is located directly above the oil supply groove. An oil guide channel with its lower end communicating with the oil supply groove is opened on the rotary hook housing. The oil guide channel is arranged from bottom to top towards the outside of the rotary hook housing. An oil supply notch is opened on the rotary hook housing to connect the oil guide channel with the rotary hook slide rail. Since the rotary hook housing on the rotating seat rotates continuously during the sewing process, an oil supply ring is installed directly below the rotary hook housing. At this time, the end of the oil pipe is embedded into the oil supply ring of the oil supply groove, and an oil guide channel is opened on the rotary hook housing. At this time, the oil at the end of the oil pipe can be guided into the rotary hook housing through the oil guide channel and lubricate the rotary hook slide rail inside the rotary hook housing. The oil guide channel is set from bottom to top towards the outside of the rotary hook housing. Under the centrifugal force of the rotating rotary hook housing, the oil guide channel can guide the lubricating oil to the rotary hook slide rail more quickly, thereby improving the rapid lubrication of the rotary hook housing.

[0013] In the aforementioned lubrication device for the sewing machine, the rotary hook housing is further provided with a guide plate. The guide plate has a horizontally positioned blocking portion at the bottom of the rotary hook housing and a vertically positioned guiding portion on the side of the rotary hook housing. The blocking portion blocks the oil supply notch, and the guiding portion blocks the rotary hook slide rail. The guide plate protrudes to form an oil inlet recess connecting to the oil supply notch. The guide plate's design allows oil flowing from the oil supply notch in the oil guide channel to be further guided by the guide plate and directly thrown towards the rotary hook slide rail. Furthermore, the protruding oil inlet recess ensures that the flow rate of lubricating oil flowing into the rotary hook housing from the oil supply not is affected by the guide plate, guaranteeing complete guidance while improving lubrication efficiency. This design also eliminates the need for significant modifications to the existing rotary hook housing, making its manufacturing process more convenient and simple.

[0014] In the aforementioned lubrication device for a sewing machine, one end of the oil inlet is located in the middle of the guide section, and the upper part of the guide section is in contact with the wall of the oil supply notch. By placing one end of the oil inlet in the middle of the guide section, the lubricating oil can flow out slowly from the upper part of the guide section, thereby improving the oil guiding effect while reducing the impact on the sewing fabric and enhancing the stability of the lubrication device.

[0015] In the aforementioned lubrication device for the sewing machine, the needle bar swing frame includes a needle bar. The oil outlet of the second oil pipe passes through the upper end of the needle bar swing frame and contacts the needle bar to supply oil. An oil box is connected to the bottom plate of the machine housing and is located below the needle bar swing frame. An oil receiving tray is sleeved on the needle bar and located inside the oil box. An oil felt connected to the oil receiving tray is provided inside the oil box. An oil passage notch is provided on the side wall of the oil receiving tray to allow oil to flow to the oil felt. By setting up the oil box, excess oil can flow into the oil box through the oil receiving tray when lubricating the needle bar. And by setting up the oil felt, the oil flowing into the oil receiving tray can flow out through the oil passage notch and flow directly onto the oil felt, thereby further receiving the lubricating oil flowing out of the needle bar and preventing excessive lubricating oil from the needle bar swing frame from dripping onto the sewing fabric, thus improving the stability of the lubrication of the needle bar swing frame.

[0016] The oil receiving pan has annular flanges at both ends. The two flanges, positioned opposite each other, form the two oil passage openings at the bottom of the oil receiving pan. This allows the oil to flow from the left and right sides, thus enabling the oil felt to receive the lubricating oil more quickly and improving the lubricating oil recovery efficiency.

[0017] In the aforementioned lubrication device for a sewing machine, the needle bar swing frame is equipped with an oil supply thread. The needle bar swing frame includes a presser foot bar. One end of the oil supply thread is located in an oil box, and the middle part of the thread passes between the presser foot bar and the needle bar, connecting to an oil reservoir. This middle part can supply oil to both the presser foot bar and the needle bar. The other end of the oil supply thread connects to the needle bar groove on the needle bar swing frame and can supply oil to the needle bar groove. By using the oil supply thread, lubricating oil can be drawn from the oil box, simultaneously lubricating the presser foot bar and the needle bar, thus improving the lubrication efficiency of the needle bar swing frame. The presence of an oil reservoir and the other end of the oil supply thread allows the lubrication device to lubricate both ends of the needle bar groove, enabling stable lubrication of other components. Furthermore, by directly drawing oil from the oil box, fewer parts are needed for lubricating the needle bar groove, resulting in better lubrication.

[0018] In the aforementioned lubrication device for the sewing machine, the oil pump's outlet end is connected to an oil outlet pipe, and an oil box two is connected to the upper end of the machine housing base plate. The oil outlet end of the oil outlet pipe is located inside the oil box two, and an oil pipe three is connected to the oil box two. The oil outlet end of the oil pipe three is connected to the oil inlet end of the oil quantity control component, and the oil outlet end of the oil pipe three is equipped with a filter element for filtering impurities in the oil. The design of the oil box two allows the oil drawn from the oil pump to first flow into the oil box two for accumulation, and then quickly flow into the oil quantity control component through the height difference of the oil pipe three. This design of the oil box two serves two purposes: firstly, due to the high flow rate of the oil during the pumping process, the oil can quickly enter the oil box two through the oil outlet pipe, allowing the oil in the oil box two to accumulate rapidly; secondly, the height difference is used to quickly guide the oil into the oil quantity control component, improving lubrication efficiency.

[0019] In the aforementioned lubrication device for the sewing machine, the second oil box is equipped with a sensor that measures the oil level within the oil box and an alarm electrically connected to the sensor. The sensor is a conventional infrared sensor or similar device capable of detecting the oil level in the second oil box. When the oil level in the second oil box is low, the sensor sends a signal to the alarm. The alarm receives the signal and sounds an alarm, which can be triggered by light and / or sound, thereby ensuring a stable oil supply to the shuttle and needle bar swing frame.

[0020] In the above-mentioned lubrication device for a sewing machine, an oil pan is connected to the machine frame platform, the shuttle seat is partially disposed within the oil pan, the bottom wall of the oil pan is a guide wall that slopes forward, the end of the guide wall near the shuttle seat gradually decreases in height compared to the end away from the shuttle seat, the oil pan is recessed downwards at the other end of the guide wall to form an oil storage cavity, an oil filter groove is provided on the front side of the oil pan, the middle of the oil filter groove has a filter plate one that cuts off the oil filter groove and can filter oil impurities, the oil storage cavity is provided with a filter plate two that covers the opening of the oil storage cavity and can filter oil impurities in the oil storage cavity, the filter plate two has an oil inlet, and an oil pump is connected to an oil inlet pipe that can be inserted into the oil inlet. The guide wall design allows the lubricating oil in the oil pan to flow towards the oil filter tank. Because the guide wall is lower at the end near the rotary hook, the oil is guided through the guide wall to the end of the oil filter tank near the rotary hook. It then flows into the oil storage chamber after being filtered by filter plate one. Filter plate two in the oil storage chamber performs secondary filtration. The filtered oil then enters the oil pump through the oil inlet pipe. The guide wall design allows the oil to be quickly collected in the oil filter tank, and the combined use of filter plates one and two achieves secondary filtration, resulting in less impurities in the oil entering the oil pump.

[0021] In the aforementioned lubrication device for the sewing machine, an oil return pipe is also provided on the machine housing base plate. One end of the oil return pipe is located inside the oil box, and the other end is positioned downwards within the oil pan. The oil return pipe allows the oil in the oil box to be quickly guided into the oil pan, achieving the recycling of unused lubricating oil. This further improves the utilization efficiency of the lubricating oil within the lubrication device and prevents excessive oil from overflowing onto the sewing fabric, thus enhancing the overall completeness of the lubrication system.

[0022] Compared with existing technologies, the lubrication device of this sewing machine has the following advantages: The above structure controls the pumping speed of the oil pump through the feeding linkage, so that the oil supply to the needle bar swing frame and the rotary hook can be adjusted according to their operating speed, thus improving the overall timeliness of oil supply. In addition, an oil quantity control component is set to control the maximum oil output of the oil pump, avoiding excessive lubricating oil accumulation at the rotary hook and needle bar swing frame when the speed is too fast, which would affect sewing. At the same time, the return oil pipe further ensures that the lubricating oil at the needle bar swing frame does not accumulate too much. Thus, the lubrication device not only improves its oil supply effect but also ensures that the sewing machine's sewing is not affected when the speed is high. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the assembled structure of the present invention.

[0024] Figure 2 This is one of the schematic diagrams of the assembled structure of the present invention.

[0025] Figure 3 This is the second schematic diagram of the assembled structure of the present invention.

[0026] Figure 4 This is the third schematic diagram of the assembled structure of the present invention.

[0027] Figure 5 This is a partial structural diagram of the needle bar swing frame after assembly of the present invention.

[0028] Figure 6 This is a top view of the oil pump in this invention.

[0029] Figure 7 yes Figure 6 Sectional view of AA.

[0030] Figure 8 yes Figure 7 A magnified view of a portion of point A in the middle.

[0031] Figure 9 This is a top view of the oil quantity control component in this invention.

[0032] Figure 10 yes Figure 9 A cross-sectional view of BB.

[0033] Figure 11 yes Figure 10 A magnified view of a section at point B.

[0034] Figure 12 This is a top view of the rotary hook seat of the present invention.

[0035] Figure 13 yes Figure 12 A partial sectional view along the CC line.

[0036] Figure 14 yes Figure 12 A partial sectional view along the middle DD.

[0037] Figure 15 This is a schematic diagram of the structure of the oil pan and the oil outlet pipe after assembly in this invention.

[0038] In the diagram, 1. Frame platform; 11. Machine housing base plate; 12. Oil box one; 12a. Oil felt; 13. Oil box two; 13a. Sensor; 13b. Alarm; 14. Oil pipe three; 14a. Filter element; 2. Rotary shuttle seat; 21. Mounting slot; 22. Base block; 23. Clamping block; 24. Oil supply ring; 24a. Oil supply groove; 25. Rotary shuttle housing; 25a. Oil guide channel; 25b. Oil supply notch; 25c. Rotary shuttle slide rail; 26. Guide plate; 26a. Shielding part. 26b. Guide section; 26c. Oil inlet notch; 3. Needle bar swing frame; 31. Needle bar; 32. Oil receiving tray; 32a. Oil passage notch; 32b. Stop edge; 33. Oil supply cotton thread; 34. Presser foot rod; 35. Oil storage cotton; 4. Transmission assembly; 41. Feeding connecting rod; 5. Oil pump; 51. Oil pump leaf spring; 52. Elastic element; 53. Oil pump housing; 53a. Oil inlet pipe; 53b. Oil outlet pipe; 53c. Sealing wall; 53d. Abutment block; 53e. 54. Oil pump gap; 55. Oil pump chamber; 56. Oil pump gasket; 56a. Oil inlet channel; 56b. Oil outlet channel; 56c. Support block; 56d. Oil inlet gap; 56e. Sealing ring; 56f. Guide groove; 57. One-way valve 1; 57a. Oil inlet baffle; 58. One-way valve 2; 58a. Oil outlet baffle; 59. Oil outlet pipe; 510. Oil inlet pipe; 6. Oil quantity control assembly; 61. Oil pipe 1; 62. Oil pipe 2; 63. Oil reservoir shell; 64. Receiving cavity; 64a. Oil inlet; 64b. Oil outlet; 65. Float; 66. Oil inlet sleeve; 66a. Guide plate; 66b. Oil passage hole; 66c. Large diameter end; 66d. Small diameter end; 67. Pin; 67a. Plug; 67b. Support ridge; 67c. Oil passage channel; 7. Needle rod groove; 8. Oil pan; 81. Guide wall; 82. Oil storage cavity; 83. Oil filter tank; 84. Filter plate one; 85. Filter plate two; 85a. Oil delivery port; 9. Oil return pipe. Detailed Implementation

[0039] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0040] like Figure 1-4 As shown, the lubrication device of this sewing machine includes a frame plate 1, a machine housing base plate 11 disposed on the frame plate 1, and a rotary hook seat 2 connected to and located below the machine housing base plate 11. A needle bar swing frame 3 and a transmission assembly 4 connected to the needle bar swing frame 3 are connected above the machine housing base plate 11. The transmission assembly 4 includes a feeding rod 41 that drives the needle bar swing frame 3 to swing.

[0041] Specifically, such as Figure 1-15 As shown, this lubrication device includes an oil pump 5 connected to the base plate 11 of the machine housing. The oil pump 5 is equipped with an oil pump leaf spring 51 that is linked with the feeding connecting rod 41 and can realize oil pumping. The oil outlet end of the oil pump 5 is connected to an oil quantity control component 6 that can control the maximum output oil flow rate. The oil outlet end of the oil quantity control component 6 is connected to an oil pipe 61 and an oil pipe 62. The oil outlet of the oil pipe 61 is located on the rotary hook seat 2, and the oil outlet of the oil pipe 62 is located on the needle bar swing frame 3. The oil quantity control component 6 is set under the base plate 11 of the machine housing and close to the rotary hook seat 2.

[0042] Working Principle: During the sewing process, the transmission assembly 4 drives the needle bar swing frame 3 to swing, while the feed linkage 41 of the transmission assembly 4 reciprocates up and down. The oil pump leaf spring 51 on the oil pump 5 pumps oil through linkage with the feed linkage 41. After the oil pump 5 draws in oil, it flows the oil from the oil pump 5 outlet to the oil quantity control assembly 6. The oil quantity control assembly 6 can output the maximum oil flow rate. Therefore, oil pipe 1 61 and oil pipe 2 62 are connected to the oil outlet of the oil quantity control assembly 6. Since the needle bar swing frame 3 is located above the machine housing base plate 11, and the rotary hook 2 is located below the machine housing base plate 11, and the rotary hook 2 requires a large amount of oil, the oil quantity control assembly 6 is set below the machine housing base plate 11 and close to the rotary hook 2. This allows the oil to be quickly supplied to the rotary hook 2 through oil pipe 1 61 during the initial oil pumping, thus controlling the rotary hook. The rotary hook in seat 2 is lubricated, while oil pipe 62 needs to extend from the bottom plate 11 of the machine housing to the needle bar swing frame 3 on the bottom plate 11 of the machine housing. During the sewing process, a small amount of oil is supplied to the needle bar swing frame 3 through the height difference. The above structure controls the pumping speed of the oil pump 5 through the feed linkage 41, so that the oil supply to the needle bar swing frame 3 and the rotary hook seat 2 can be realized according to their running speed, thus making the overall oil supply more timely. In addition, an oil quantity control component 6 is set to control the maximum output oil flow of the oil pump 5, so as to avoid the oil flow rate being too fast when the speed is too fast, resulting in too much lubricating oil accumulation at the rotary hook seat 2 and the needle bar swing frame 3, which would affect the sewing. Thus, the lubrication device can not only improve its oil supply effect, but also ensure that the sewing machine does not affect the sewing when the speed is high.

[0043] like Figure 6-8 As shown, the oil pump 5 includes an oil pump housing 53 and an oil pump baffle 54 connected to the oil pump housing 53. The oil pump leaf spring 51 always abuts against the oil pump baffle 54. The oil pump housing 53 and the oil pump baffle 54 together form a sealed oil pump chamber 55. An oil pump gasket 56 is provided inside the oil pump housing 53 and located within the oil pump chamber 55. An oil inlet pipe 53a and an oil outlet pipe 53b are provided on the oil pump housing 53. The oil pump 5 includes a control mechanism to connect or disconnect the oil pump chamber 55 from the oil inlet pipe 53a. One-way valve 57 and one-way valve 58, which controls the connection or disconnection between the oil pump chamber 55 and the oil outlet pipe 53b, are provided. The connection directions of one-way valve 57 and one-way valve 58 are opposite. An elastic element 52 is provided between the oil pump gasket 56 and the oil pump partition 54. The elastic element 52 can push the oil pump partition 54 to reset and open one-way valve 57 and close one-way valve 58. When the oil pump leaf spring 51 moves downward and drives the oil pump partition 54 to move downward, one-way valve 57 closes and one-way valve 58 opens.

[0044] like Figure 6-8As shown, the oil pump gasket 56 has an oil inlet channel 56a that can communicate with the oil inlet pipe 53a and an oil outlet channel 56b that can communicate with the oil outlet pipe 53b. The one-way valve 57 includes an annular closed wall 53c, a support block 56c, and an oil inlet baffle 57a disposed between the support block 56c and the closed wall 53c. The oil pump gasket 56 has a plurality of the aforementioned support blocks 56c arranged circumferentially along the oil inlet channel 56a below the oil inlet channel 56a. There is an oil inlet gap 56d between two support blocks 56c. The oil pump housing 53 has the aforementioned closed wall 53c above the oil inlet pipe 53a. The support blocks 56c can... The inlet baffle 57a presses against the closed wall 53c. The one-way valve 58 includes abutment block 53d, a closing ring 56e, and an outlet baffle 58a disposed between the abutment block 53d and the closing ring 56e. The oil pump gasket 56 is provided with the aforementioned closing ring 56e, which is annular and can press the outlet baffle 58a against the oil pump housing 53, below the oil outlet channel 56b. The oil pump housing 53 is provided with a plurality of abutment blocks 53d arranged circumferentially along the oil outlet channel 53b above the oil outlet channel 53b. There is an oil outlet gap 53e between two abutment blocks 53d. The closing ring 56e can press the outlet baffle 58a against the abutment block 53d.

[0045] By setting multiple support blocks 56c and having an oil inlet gap 56d between two support blocks 56c, when the oil inlet baffle 57a moves upward and abuts against the support block 56c, the oil can flow along the oil inlet pipe 53a through the oil inlet gap 56d and into the oil inlet channel 56a, thus realizing oil pumping. The overall structure is relatively simple, and the oil suction is achieved by the negative pressure difference between the air pressure in the pump chamber and the external air pressure, which makes the power structure more stable during long-term use. When the power structure discharges oil, the sealing wall 53c and the oil inlet baffle 57a directly block the oil inlet channel 56a and the oil inlet pipe 53a. By setting the abutment block 53d, when the oil pump leaf spring 51 squeezes the oil pump downward, The baffle 54 compresses the volume inside the pump oil chamber, causing both the oil outlet baffle 58a and the oil inlet baffle 57a to move downwards. At this time, the oil outlet baffle 58a abuts against the abutment block 53d on the oil pump housing 53. The lubricating oil in the pump oil chamber can flow through the oil outlet channel 56b, through the oil outlet gap 53e, and out through the oil outlet pipe 53b, thus achieving oil supply and lubrication for the sewing machine parts. When both the oil outlet baffle 58a and the oil inlet baffle 57a move upwards, the oil outlet baffle 58a forms a seal with the sealing ring 56e of the oil pump housing 53, thereby preventing the oil from flowing out of the oil outlet gap 53e and achieving oil suction, so that the power structure can supply oil stably.

[0046] like Figure 6-8As shown, the oil pump gasket 56 has an annular guide groove 56f in the middle. The elastic element 52 is a return spring. One end of the return spring is set in the guide groove 56f and abuts against the bottom of the guide groove 56f. The other end of the return spring abuts against the oil pump partition 54.

[0047] The guide groove 56f serves to guide the return spring, preventing it from displacing significantly in the pump oil chamber. This allows the return spring to stably lift the pump baffle 54, improving the stability of the power structure.

[0048] like Figure 9-11 As shown, the oil quantity control component 6 includes an oil reservoir housing 63, which has a receiving cavity 64. The upper end of the receiving cavity 64 has an oil inlet 64a, and the lower end of the receiving cavity 64 has an oil outlet 64b. The receiving cavity 64 is provided with a float ball 65 that can block the oil outlet 64b. An oil inlet sleeve 66 is inserted into the oil reservoir housing 63 at the oil inlet 64a. The middle part of the oil inlet sleeve 66 is provided with a guide plate 66a. The guide plate 66a has an oil passage hole 66b that allows the oil outlet end of the oil pump 5 to communicate with the receiving cavity 64. A pin 67 is slidably connected to the oil inlet sleeve 66. The float ball 65 can float upward and push the pin 67 to move upward and block the oil passage hole 66b.

[0049] like Figure 9-11 As shown, the upper end of the pin 67 has a plug 67a that can be inserted into the oil passage 66b to seal the oil passage 66b. The upper end of the plug 67a is conical or spherical. The oil inlet sleeve 66 has a small diameter end 66d and a large diameter end 66c. The small diameter end 66d is located outside the oil reservoir shell 63. The diameter of the small diameter end 66d is smaller than the diameter of the large diameter end 66c. The guide plate 66a is disposed between the small diameter end 66d and the large diameter end 66c. The outer side wall of the pin 67 has multiple support ridges 67b. An oil passage 67c that can communicate with the oil passage 66b is formed between two adjacent support ridges 67b. The outer side wall of the support ridge 67b is close to the inner side wall of the oil inlet sleeve 66. The shape of the plug 67a allows the oil passage hole 66b to be sealed gradually during the sealing process, resulting in less resistance. Furthermore, the plug 67a and the guide plate 66a are in line contact, allowing the oil passage hole 66b to open quickly when the lubricating oil in the receiving cavity 64 decreases, thus ensuring more timely oil supply. The design of the large-diameter end 66c and the small-diameter end 66d allows the oil to quickly pass through the oil passage hole 66b of the guide plate 66a to the large-diameter end 66c, where it is buffered. The oil then enters the receiving cavity 64 through the gap between the large-diameter end 66c and the pin 67, making the oil entering the receiving cavity 64 more stable.

[0050] like Figure 12-14As shown, a vertical mounting groove 21 is provided on the upper edge of the rotary shuttle seat 2. The groove opening of the mounting groove 21 faces upward and extends through the upper end face of the rotary shuttle seat 2. A bottom block 22 and a clamping block 23 threadedly connected to the rotary shuttle seat 2 and set on the bottom block 22 are provided in the mounting groove 21. The bottom block 22 is set at the bottom of the mounting groove 21. An oil pipe 61 is set between the bottom block 22 and the clamping block 23. The rotary shuttle seat 2 is also provided with an annular oil supply ring 24. An annular oil supply groove 24a is opened on the oil supply ring 24. The end of the oil pipe 61 is embedded in the oil supply groove 24a. A rotary shuttle housing 25 with a rotary shuttle slide rail 25c is connected to the rotary shuttle seat 2. The rotary shuttle housing 25 is set directly above the oil supply groove 24a. The lower end of the rotary shuttle housing 25 communicates with the oil supply groove 24a. An oil guiding channel 25a is provided from bottom to top outwards towards the outside of the shuttle housing 25. An oil supply notch 25b is provided on the shuttle housing 25 to connect the oil guiding channel 25a with the shuttle slide rail 25c. A guide plate 26 is also provided on the shuttle housing 25. The guide plate 26 has a blocking part 26a horizontally provided on the bottom of the shuttle housing 25 and a guide part 26b vertically provided on the side of the shuttle housing 25. The blocking part 26a blocks the oil supply notch 25b, and the guide part 26b blocks the shuttle slide rail 25c. The guide plate 26 protrudes to form an oil inlet recess 26c that connects to the oil supply notch 25b. One end of the oil inlet recess 26c is provided in the middle of the guide part 26b, and the upper part of the guide part 26b is in contact with the opening wall of the oil supply notch 25b.

[0051] like Figure 2 , Figure 3 and Figure 5 As shown, the needle bar swing frame 3 includes a needle bar 31. The oil outlet end of the second oil pipe 62 passes through the upper end of the needle bar swing frame 3 and contacts the needle bar 31 to supply oil. An oil box 12 located below the needle bar swing frame 3 is connected to the bottom plate 11 of the machine housing. An oil receiving tray 32 located inside the oil box 12 is sleeved on the needle bar 31. An oil felt 12a connected to the oil receiving tray 32 is provided inside the oil box 12. An oil passage notch 32a is opened on the side wall of the oil receiving tray 32 to allow oil to flow to the felt 12a. The front and rear ends of the oil receiving tray are provided with annular retaining edges 32b. The two ends of the two retaining edges 32b are arranged opposite to each other and are connected to the oil receiving tray. The bottom is enclosed to form the two oil passage gaps 32a mentioned above. The needle bar swing frame 3 is provided with an oil supply cotton thread 33. The needle bar swing frame 3 includes a presser foot rod 34. One end of the oil supply cotton thread 33 is set in the oil box 12. The middle part of the oil supply cotton thread 33 passes between the presser foot rod 34 and the needle bar 31 and is connected to the oil storage cotton 35. The middle part can supply oil to the presser foot rod 34 and the needle bar 31. The machine frame plate 1 is also provided with a needle bar slide groove 7. The needle bar swing frame 3 is provided with an oil storage cotton 35. The other end of the oil supply cotton thread 33 passes through the oil storage cotton 35 and is placed above the needle bar slide groove 7. The oil storage cotton 35 is located below the needle bar slide groove 7.

[0052] like Figure 1-4As shown, the oil pump 5 has an oil outlet pipe 59 connected to its outlet end, and an oil box 13 is connected to the upper end of the base plate 11 of the housing. The oil outlet end of the oil outlet pipe 59 is located inside the oil box 13. An oil pipe 14 is connected to the oil box 13. The oil outlet end of the oil pipe 14 is connected to the oil inlet end of the oil quantity control component 6. The oil outlet end of the oil pipe 14 is equipped with a filter element 14a for filtering oil impurities. The oil box 13 is equipped with a sensor 13a that can measure the oil level in the oil box 13 and an alarm 13b that is electrically connected to the sensor 13a.

[0053] like Figure 1 and Figure 15 As shown, an oil pan 8 is connected to the frame plate 1. The rotary hook seat 2 is partially set inside the oil pan 8. The bottom wall of the oil pan 8 is a guide wall 81 that slopes forward. The end of the guide wall 81 near the rotary hook seat 2 gradually decreases in height compared to the end away from the rotary hook seat 2. The oil pan 8 is recessed downward at the other end of the guide wall 81 to form an oil storage cavity 82. An oil filter groove 83 is provided on the front side of the oil pan 8. The middle of the oil filter groove 83 has a filter plate 84 that cuts off the oil filter groove 83 and can filter oil impurities. A filter plate 85 is provided inside the oil storage cavity 82, covering the opening of the oil storage cavity 82 and filtering oil impurities inside the oil storage cavity 82. An oil inlet 85a is provided on the filter plate 85. An oil inlet pipe 510 that can be inserted into the oil inlet 85a is connected to the oil pump 5. A return oil pipe 9 is also provided on the bottom plate 11 of the machine housing. One end of the return oil pipe 9 is set inside the oil box 12, and the other end of the return oil pipe 9 is set downward and located inside the oil pan 8.

[0054] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A lubrication device for a sewing machine, the sewing machine comprising a frame plate (1), a housing base plate (11) disposed on the frame plate (1), and a rotary hook seat (2) connected to and located below the housing base plate (11), wherein a needle bar swing frame (3) and a transmission assembly (4) connected to the needle bar swing frame (3) are connected above the housing base plate (11), the transmission assembly (4) comprising a feeding link (41) for swinging the needle bar swing frame (3), characterized in that, This lubrication device includes an oil pump (5) connected to the base plate (11) of the machine housing. The oil pump (5) is equipped with an oil pump leaf spring (51) that is linked with the feeding connecting rod (41) and can realize oil pumping. The oil outlet end of the oil pump (5) is connected to an oil quantity control component (6) that can control the maximum output oil flow rate. The oil outlet end of the oil quantity control component (6) is connected to an oil pipe one (61) and an oil pipe two (62). The oil outlet of the oil pipe one (61) is located on the rotary hook seat (2), and the oil outlet of the oil pipe two (62) is located on the needle bar swing frame (3). The oil quantity control component (6) is set under the base plate (11) of the machine housing and close to the rotary hook seat (2). The oil pump (5) includes an oil pump housing (53) and an oil pump leaf spring (51) connected to the base plate (11) of the machine housing. The outer casing (53) is connected to the oil pump baffle (54). The oil pump leaf spring (51) always abuts against the oil pump baffle (54). The oil pump outer casing (53) and the oil pump baffle (54) together form a sealed oil pump chamber (55). The oil pump outer casing (53) is provided with an oil pump gasket (56) located in the oil pump chamber (55). The oil pump outer casing (53) is provided with an oil inlet pipe (53a) and an oil outlet pipe (53b). The oil pump (5) includes a one-way valve (57) that controls the connection or disconnection between the oil pump chamber (55) and the oil inlet pipe (53a) and a one-way valve (58) that controls the connection or disconnection between the oil pump chamber (55) and the oil outlet pipe (53b). The one-way valve (57) and the one-way valve (58) are connected to each other. The two valves (58) have opposite communication directions. An elastic element (52) is provided between the oil pump gasket (56) and the oil pump partition (54). The elastic element (52) can push the oil pump partition (54) to reset and open the one-way valve (57) and close the one-way valve (58). When the oil pump leaf spring (51) moves downward and drives the oil pump partition (54) to move downward, the one-way valve (57) closes and the one-way valve (58) opens. The oil pump gasket (56) is provided with an oil inlet channel (56a) that can communicate with the oil inlet pipe (53a) and an oil outlet channel (56b) that can communicate with the oil outlet pipe (53b). The one-way valve (57) includes an annular closed wall (53c) and a support block (56c). An oil inlet baffle (57a) is provided between a support block (56c) and a closed wall (53c). The oil pump gasket (56) has multiple support blocks (56c) arranged circumferentially along the oil inlet channel (56a) below the oil inlet channel (56a). There is an oil inlet gap (56d) between two support blocks (56c). The oil pump housing (53) has the closed wall (53c) above the oil inlet pipe (53a). The support block (56c) can press the oil inlet baffle (57a) onto the closed wall (53c). The one-way valve (58) includes a stop block (53d), a closing ring (56e), and an oil outlet baffle (58a) provided between the stop block (53d) and the closing ring (56e).The oil pump gasket (56) has an annular sealing ring (56e) below the oil outlet channel (56b) that presses the oil outlet baffle (58a) against the oil pump housing (53). The oil pump housing (53) has multiple abutment blocks (53d) arranged circumferentially along the oil outlet pipe (53b) above the oil outlet pipe (53b). An oil outlet gap (53e) exists between two abutment blocks (53d). The sealing ring (56e) presses the oil outlet baffle (58a) against the abutment blocks (53d).

2. The lubrication device for a sewing machine according to claim 1, characterized in that, The oil quantity control component (6) includes an oil reservoir shell (63), which has a receiving cavity (64). The upper end of the receiving cavity (64) has an oil inlet (64a), and the lower end of the receiving cavity (64) has an oil outlet (64b). The receiving cavity (64) is provided with a float (65) that can block the oil outlet (64b). An oil inlet sleeve (66) is inserted into the oil inlet (64a) of the oil reservoir shell (63). The oil inlet sleeve (66) has an oil passage hole (66b) that allows the oil outlet of the oil pump (5) to communicate with the receiving cavity (64). A pin (67) is slidably connected to the oil inlet sleeve (66). The float (65) can float upward and push the pin (67) to move upward to block the oil passage hole (66b).

3. The lubrication device for a sewing machine according to claim 1, characterized in that, The rotary hook seat (2) has a vertically oriented mounting groove (21) with the groove opening facing upward and penetrating the upper end face of the rotary hook seat (2). The mounting groove (21) has a bottom block (22) and a clamping block (23) threadedly connected to the rotary hook seat (2) and set on the bottom block (22). The bottom block (22) is set at the bottom of the mounting groove (21). The oil pipe (61) is set between the bottom block (22) and the clamping block (23).

4. The lubrication device for a sewing machine according to claim 1, characterized in that, The rotary shuttle seat (2) is also provided with an annular oil supply ring (24), and an annular oil supply groove (24a) is provided on the oil supply ring (24). The end of the oil pipe (61) is embedded in the oil supply groove (24a). The rotary shuttle seat (2) is connected to a rotary shuttle housing (25) with a rotary shuttle slide rail (25c). The rotary shuttle housing (25) is located directly above the oil supply groove (24a). The rotary shuttle housing (25) is provided with an oil guide channel (25a) whose lower end communicates with the oil supply groove (24a). The oil guide channel (25a) is arranged from bottom to top towards the outside of the rotary shuttle housing (25). The rotary shuttle housing (25) is provided with an oil supply notch (25b) that connects the oil guide channel (25a) and the rotary shuttle slide rail (25c).

5. The lubrication device for a sewing machine according to claim 4, characterized in that, The rotary shuttle housing (25) is also provided with a guide plate (26). The guide plate (26) has a blocking part (26a) horizontally arranged on the bottom of the rotary shuttle housing (25) and a guide part (26b) vertically arranged on the side of the rotary shuttle housing (25). The blocking part (26a) blocks the oil supply notch (25b), and the guide part (26b) blocks the rotary shuttle slide rail (25c). The guide plate (26) protrudes to form an oil inlet notch (26c) that connects to the oil supply notch (25b).

6. The lubrication device for a sewing machine according to claim 1, characterized in that, The needle bar swing frame (3) includes a needle bar (31). The oil outlet end of the second oil pipe (62) passes through the upper end of the needle bar swing frame (3) and contacts the needle bar (31) to supply oil. An oil box (12) located below the needle bar swing frame (3) is connected to the bottom plate (11) of the housing. An oil receiving tray (32) located in the oil box (12) is sleeved on the needle bar (31). An oil felt (12a) connected to the oil receiving tray (32) is provided in the oil box (12). An oil passage notch (32a) is provided on the side wall of the oil receiving tray (32) to allow oil to flow to the oil felt (12a).

7. The lubrication device for a sewing machine according to claim 6, characterized in that, The needle bar swing frame (3) is provided with an oil supply cotton thread (33). The needle bar swing frame (3) includes a presser foot rod (34). One end of the oil supply cotton thread (33) is placed in the oil box (12). The middle part of the oil supply cotton thread (33) passes between the presser foot rod (34) and the needle bar (31) and is connected to the oil storage cotton (35). The middle part can supply oil to the presser foot rod (34) and the needle bar (31). The other end of the oil supply cotton thread (33) is connected to the needle bar slide groove (7) on the needle bar swing frame (3) and can supply oil to the needle bar slide groove (7).

8. The lubrication device for a sewing machine according to claim 1, characterized in that, The oil pump (5) has an oil outlet pipe (59) connected to its outlet end. The upper end of the base plate (11) of the housing is connected to an oil box (13). The oil outlet end of the oil outlet pipe (59) is located inside the oil box (13). An oil pipe (14) is connected to the oil box (13). The oil outlet end of the oil pipe (14) is connected to the oil inlet end of the oil quantity control component (6). The oil outlet end of the oil pipe (14) is equipped with a filter element (14a) for filtering oil impurities.

9. The lubrication device for a sewing machine according to claim 1, characterized in that, An oil pan (8) is connected to the frame platform (1). The rotary shuttle seat (2) is partially located inside the oil pan (8). The bottom wall of the oil pan (8) is a guide wall (81) that slopes forward. The end of the guide wall (81) near the rotary shuttle seat (2) gradually decreases in height compared to the end away from the rotary shuttle seat (2). The oil pan (8) is recessed downward at the other end of the guide wall (81) to form an oil storage cavity (82). An oil filter is provided on the front side of the oil pan (8). The oil filter tank (83) has a filter plate (84) in the middle that cuts off the oil filter tank (83) and can filter oil impurities. The oil storage chamber (82) is provided with a filter plate (85) that covers the opening of the oil storage chamber (82) and can filter oil impurities in the oil storage chamber (82). The filter plate (85) is provided with an oil inlet (85a). The oil pump (5) is connected to an oil inlet pipe (510) that can be inserted into the oil inlet (85a).

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