Sewing machine with oil supply to upper shaft

Abstract

The utility model provides a sewing machine of upper section main shaft oil supply belongs to sewing machine technical field. It solved the hinge of existing sewing machine needle bar crank and needle bar connecting rod and the problems such as the lack of oil supply. The sewing machine of upper section main shaft oil supply, including upper section main shaft and the oil pipe of oil pump connection, the left end of upper section main shaft is sleeved and fixedly connected with needle bar crank, and the needle bar connecting rod is hinged on needle bar crank, it is characterized in that, upper section main shaft has center hole, the outer circumferential surface of upper section main shaft middle part is equipped with the oil inlet hole of intercommunication with center hole, the outer circumferential surface of upper section main shaft left end is equipped with the first oil outlet hole of intercommunication with center hole, the inner hole of oil pipe and oil inlet hole intercommunication, the hinge between needle bar crank and needle bar connecting rod and first oil outlet hole intercommunication, and oil cotton is fixed in oil inlet hole and first oil outlet hole. The utility model discloses a sewing machine of upper section main shaft oil supply, and the hinge between needle bar crank and needle bar connecting rod and first oil outlet hole intercommunication, and oil cotton is fixed in oil inlet hole and first oil outlet hole.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a sewing machine with oil supply in the upper section of the main shaft. Background Technology

[0002] A sewing machine is a machine that sews fabric together with thread. It includes a needle bar mechanism, thread take-up mechanism, feed mechanism, hook mechanism, pressing mechanism, winding device, and lubrication system. The lubrication system refers to the device that delivers lubricating oil during sewing, typically through an oil pump that transports lubricating oil from an oil pan to various moving parts of the sewing machine. The upper spindle, also known as the upper shaft, is horizontally installed inside the sewing machine head. The right end of the upper shaft is connected to the drive source, and the left end is connected to the needle bar crank. The needle bar crank is hinged to the needle bar connecting rod, which is connected to the needle bar. The upper shaft also connects to the thread take-up lever. Rotation of the upper shaft drives the needle bar and thread take-up lever to move up and down.

[0003] A lubrication device is installed on the upper main shaft. For example, Chinese patent literature discloses an oil supply device and a sewing machine having it [Application No.: CN202122344468.0; Publication No.: CN216107551U]. The oil supply component includes an oil receiving tray, an oil filter, and an upper oil spray pipe. The oil filter is connected to the oil pump assembly, and the upper oil spray pipe is connected to the oil filter, passing through the oil receiving tray. The oil output from the oil pump assembly can enter the oil filter, and then enter the upper oil spray pipe, thereby supplying oil to the sewing machine through the upper oil spray pipe. The oil receiving tray is located above the upper main shaft and has drip holes. The lubricating oil in the oil receiving tray drips downwards through the drip holes by gravity. The above-mentioned lubricating oil supply method is drip injection, which is intermittent and uncontrollable. The position of the drip hole is fixed, while the position of the hinge between the needle bar crank and the needle bar connecting rod changes continuously with the rotation of the spindle. When the oil drop falls, it may not fall exactly at the hinge between the needle bar crank and the needle bar connecting rod, which can easily lead to insufficient oil supply. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a sewing machine with upper main shaft oil supply, which solves the technical problem that insufficient oil supply easily occurs at the hinge joint between the needle bar crank and the needle bar connecting rod in existing sewing machines.

[0005] The objective of this utility model can be achieved through the following technical solutions: A sewing machine with an upper spindle oil supply includes an upper spindle and an oil pipe connected to an oil pump. A needle bar crank is fitted and fixedly connected to the left end of the upper spindle, and a needle bar connecting rod is hinged to the needle bar crank. The upper spindle has a central hole, an oil inlet hole communicating with the central hole is opened on the outer circumferential surface of the middle part of the upper spindle, and a first oil outlet hole communicating with the central hole is opened on the outer circumferential surface of the left end of the upper spindle. The inner hole of the oil pipe communicates with the oil inlet hole, and the hinge joint between the needle bar crank and the needle bar connecting rod communicates with the first oil outlet hole. Oil-soaked cotton is fixed inside both the oil inlet hole and the first oil outlet hole.

[0006] When the oil pump is working, it delivers lubricating oil from the oil reservoir through the oil pipe to the oil inlet. After passing through the oil inlet, the lubricating oil enters the central hole, and then through the first oil outlet to the hinge between the needle rod crank and the needle rod connecting rod for lubrication. This achieves forced directional oil supply, which helps avoid insufficient lubrication. The lubricating oil passing through the oil cotton in the oil inlet and the first oil outlet not only has a filtering effect, keeping the lubricating oil clean, but the oil cotton also temporarily stores the lubricating oil, preventing the lubricating oil in the central hole from flowing away quickly from the oil inlet and the first oil outlet under gravity. Thus, even when the oil pump stops working, the lubricating oil in the central hole can still be continuously supplied to the hinge between the needle rod crank and the needle rod connecting rod through the first oil outlet, helping to avoid insufficient lubrication.

[0007] In the sewing machine with main shaft oil supply described above, the needle bar crank has a flow hole opposite to the first oil outlet hole. The needle bar crank and the needle bar connecting rod are hinged by a hollow pin. The pin is inserted and fixed in the needle bar crank. The needle bar connecting rod is fitted on the pin, and a bearing is provided between the needle bar connecting rod and the pin. The inner hole of the pin connects the bearing raceway and the flow hole.

[0008] The hollow pin not only connects the needle bar crank and the needle bar connecting rod, but also forms an oil supply channel for lubricating oil. This allows lubricating oil to flow smoothly from the first oil outlet through the overflow hole and the inner hole of the pin into the bearing raceway, lubricating the rollers in the bearing. This ensures forced oil supply to the hinge between the needle bar crank and the needle bar connecting rod, preventing insufficient oil supply at this joint. Furthermore, the first oil outlet, opposite the overflow hole, also lubricates the connection between the needle bar crank and the upper spindle. Although the needle bar crank and the upper spindle appear fixed, under high-speed reciprocating motion and vibration, minute relative sliding, imperceptible to the naked eye, occurs between the contact surfaces of the two parts. Lubricating oil entering between the needle bar crank and the upper spindle minimizes this fretting wear, preventing parts from seizing or excessively wearing.

[0009] In the sewing machine with main shaft oil supply described above, an annular circumferential groove communicating with the inner hole of the pin is formed on the outer circumferential surface of the pin, and the flow hole is positioned corresponding to the circumferential groove. The circumferential groove allows the flow hole to remain in communication with the inner hole of the pin, thereby enabling the lubricating oil to smoothly enter the bearing raceway and provide forced lubrication to the bearing.

[0010] In the sewing machine with main shaft oil supply described above, an additional hole corresponding to the position of the circumferential groove is also provided on the outer circumferential surface of the needle bar crank, and a baffle is fixed above the needle bar crank. When the sewing machine is working at high speed, some lubricating oil can be thrown out through the additional hole, and the lubricating oil hits the baffle and bounces back, thereby making other parts more lubricated.

[0011] In the sewing machine with oil supply from the upper main shaft described above, an oil inlet sleeve is fitted in the middle of the upper main shaft, and an annular oil groove is provided on the inner circumferential surface of the oil inlet sleeve. The oil groove connects the inner hole of the oil pipe and the oil inlet hole.

[0012] When the oil pump is working, lubricating oil enters the oil inlet hole from the oil pipe through the oil trough. When the sewing machine is working, the upper main shaft rotates while the oil inlet sleeve remains stationary, facilitating the connection of the oil pipe.

[0013] In the sewing machine with main shaft oil supply described above, an additional spiral groove is provided on the inner circumferential surface of the oil inlet sleeve. The left end of the additional groove is connected to the oil groove, and the right end of the additional groove penetrates the right end face of the oil inlet sleeve.

[0014] When the oil pump is working, the lubricating oil enters the oil inlet hole after passing through the oil groove from the oil pipe. At the same time, some lubricating oil will also flow out from the right end opening of the auxiliary groove, forming an overflow effect. This prevents the amount of oil at the hinge between the needle bar crank and the needle bar connecting rod from being too large. Moreover, the overflowing lubricating oil can also provide lubrication for other components.

[0015] In the sewing machine with oil supply from the upper main shaft described above, the sewing machine also includes an oil pan fixed above the upper main shaft. A hollow screw is fixed on the oil pan, and the lower end of the screw is inserted into the oil inlet sleeve. The inner hole of the screw connects the inner hole of the oil pipe with the oil groove.

[0016] The screw is used not only to position the oil inlet sleeve, but also to form an oil supply channel for lubricating oil, so that the lubricating oil can enter the hinge between the needle bar crank and the needle bar connecting rod for lubrication, which helps to avoid insufficient oil supply at the hinge between the needle bar crank and the needle bar connecting rod.

[0017] In the sewing machine with main shaft oil supply described above, an oil spray connector is fixed at the upper end of the oil pipe. The oil spray connector passes through and is fixed on the oil pan. A hollow connecting plate is fixedly connected between the screw and the oil spray connector. The inner hole of the connecting plate connects the inner hole of the oil spray connector and the inner hole of the screw.

[0018] The connecting plate not only makes the oil pan, screws and oil injection connector more stable, but also forms an oil supply channel for lubricating oil, allowing the lubricating oil to enter the hinge between the needle bar crank and the needle bar connecting rod for lubrication, which helps to avoid insufficient oil supply at the hinge between the needle bar crank and the needle bar connecting rod.

[0019] In the sewing machine with main shaft oil supply described above, a side hole communicating with the inner hole of the screw is opened on the outer circumferential surface of the screw. The side hole is located between the oil inlet sleeve and the oil pan, and a nozzle is provided at the upper end of the oil spray connector. Lubricating oil enters the oil pan through the nozzle, and then drips onto other parts through the oil pan. Lubricating oil can also be sprayed onto the outer circumferential surface of the oil inlet sleeve through the side hole and dripped onto other parts, which is beneficial to the overall lubrication of the sewing machine.

[0020] In the sewing machine with oil supply from the upper main shaft described above, the upper main shaft has a thread take-up crank section, which is fitted with and fixedly connected to a thread take-up crank. A second oil outlet hole communicating with the center hole is provided on the outer circumferential surface of the thread take-up crank section.

[0021] The second oil outlet is located on the outer circumference of the take-up crank section. It lubricates the connection between the take-up crank and the upper spindle. Although the take-up crank and the upper spindle appear to be fixedly connected, under high-speed reciprocating motion and vibration, minute relative sliding, imperceptible to the naked eye, occurs between the contact surfaces of the two parts. Lubricating oil entering between the needle bar crank and the upper spindle can minimize this fretting wear, preventing parts from seizing or excessive wear. In addition, due to the obstruction of the take-up crank, the lubricating oil in the center hole will not flow away quickly from the second oil outlet when the oil pump stops working. This ensures the temporary storage function of the lubricating oil in the center hole, allowing the hinge between the needle bar crank and the needle bar connecting rod to be replenished with lubricating oil through the first oil outlet when the oil pump stops working.

[0022] Compared with the prior art, the present invention has the following advantages: The upper section of the spindle is equipped with a center hole, an oil inlet hole, and a first oil outlet hole. The inner hole of the oil pipe is connected to the oil inlet hole, and the hinge between the needle bar crank and the needle bar connecting rod is connected to the first oil outlet hole. Oil cotton is fixed in both the oil inlet hole and the first oil outlet hole, which can force oil supply to the hinge between the needle bar crank and the needle bar connecting rod. The oil cotton filters the oil and temporarily stores the lubricating oil in the center hole, which helps to avoid insufficient oil supply at the hinge between the needle bar crank and the needle bar connecting rod. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the upper main shaft of this sewing machine.

[0024] Figure 2 This is a sectional view of the sewing machine at the upper main shaft.

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0026] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0027] Figure 5 This is a cross-sectional view of the sewing machine at the connecting plate.

[0028] In the diagram, 1. Upper spindle section; 1a. Center hole; 1b. Oil inlet; 1c. First oil outlet; 1d. Thread-fetching crankshaft section; 1d1. Second oil outlet; 2. Oil pan; 3. Oil pump; 4. Oil pipe; 5. Needle bar crank; 5a. Flow hole; 5b. Additional hole; 6. Needle bar connecting rod; 7. Pin; 7a. Circumferential groove; 8. Bearing; 9. Oil cotton; 10. Baffle; 11. Oil inlet sleeve; 11a. Oil groove; 11b. Additional groove; 12. Screw; 12a. Side hole; 13. Connecting plate; 14. Oil injection connector; 14a. Nozzle; 15. Thread-fetching crank; 16. Needle bar; 17. Slider; 18. Guide plate. Detailed Implementation

[0029] 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.

[0030] Example 1

[0031] like Figure 1 and Figure 2 As shown, a sewing machine with an upper main shaft oil supply includes an upper main shaft 1, an oil pan 2 fixed above the upper main shaft 1, and an oil pipe 4 connected to an oil pump 3. The upper main shaft 1 is installed in the sewing machine housing, and a main bearing is provided between the upper main shaft 1 and the housing. A needle bar crank 5 is fitted and fixedly connected to the left end of the upper main shaft 1. A needle bar connecting rod 6 is hinged to the needle bar crank 5, and a needle bar 16 and a slider 17 are fixedly hinged to the lower end of the needle bar connecting rod 6. A rod hole is provided in the sewing machine housing, and the needle bar 16 passes through the rod hole. A guide plate 18 located below the needle bar crank 5 is fixed on the sewing machine housing, and the slider 17 is embedded in the guide plate 18 and can slide up and down. The needle bar crank 5 and the needle bar connecting rod 6 are hinged by a hollow pin 7. The pin 7 is inserted and fixed in the needle bar crank 5. The upper end of the needle bar connecting rod 6 is fitted on the pin 7, and a bearing 8 is provided between the needle bar connecting rod 6 and the pin 7.

[0032] like Figure 2 and Figure 3As shown, the upper spindle 1 has a central hole 1a, which is a blind hole. A plunger is threaded into the opening of the central hole 1a to seal it. A first oil outlet hole 1c, communicating with the central hole 1a, is opened on the outer circumferential surface of the left end of the upper spindle 1. The hinge between the needle crank 5 and the needle connecting rod 6 is connected to the first oil outlet hole 1c, and an oil cotton 9 is fixed inside the first oil outlet hole 1c. A flow-through hole 5a, opposite to the first oil outlet hole 1c, is opened in the needle crank 5. The inner hole of the pin 7 connects the raceway of the bearing 8 and the flow-through hole 5a. An annular circumferential groove 7a, communicating with the inner hole of the pin 7, is opened on the outer circumferential surface of the pin 7. The flow-through hole 5a is positioned corresponding to the circumferential groove 7a. The inner hole of the pin 7 includes an axial pin hole, a first radial pin hole, and a second radial pin hole. The axial pin hole is a blind hole, while the first and second radial pin holes are both through holes and communicate with the axial pin hole. There is one first radial pin hole, which corresponds to the position of the flow hole 5a. Several second radial pin holes are arranged evenly along the circumference, corresponding to the position of the bearing 8. A plug can be installed at the opening of the axial pin hole. An additional hole 5b corresponding to the position of the circumferential groove 7a is also provided on the outer circumferential surface of the needle bar crank 5. The additional hole 5b is coaxially arranged with the flow hole 5a, which facilitates the machining of the additional hole 5b and the flow hole 5a. A baffle 10 is fixed above the needle bar crank 5. The baffle 10 is arc-shaped and fixed to the machine housing.

[0033] like Figure 2 and Figure 4 As shown, an oil inlet hole 1b communicating with the central hole 1a is opened on the outer circumferential surface of the middle section of the upper spindle 1, and an oil cotton 9 is fixed inside the oil inlet hole 1b. The inner hole of the oil pipe 4 communicates with the oil inlet hole 1b. An oil inlet sleeve 11 is fitted in the middle of the upper spindle 1. An annular oil groove 11a and a spiral auxiliary groove 11b are provided on the inner circumferential surface of the oil inlet sleeve 11. An insertion hole is opened on the outer circumferential surface of the oil inlet sleeve 11, which penetrates the bottom surface of the auxiliary groove 11b. The left end of the auxiliary groove 11b is connected to the oil groove 11a, and the right end of the oil groove 11a penetrates the right end face of the oil inlet sleeve 5. Figure 5As shown, a hollow screw 12 is fixed on the oil pan 2, with its lower end inserted into the insertion hole of the oil inlet sleeve 11. An oil injector 14 is fixed to the upper end of the oil pipe 4, passing through and fixed to the oil pan 2. A hollow connecting plate 13 is fixedly connected between the screw 12 and the oil injector 14. The inner hole of the connecting plate 13 connects the inner hole of the oil injector 14 and the inner hole of the screw 12. The inner hole of the screw 12 includes an axial screw hole and a radial screw hole. The axial screw hole is a blind hole, and the radial screw hole is a through hole connected to the axial screw hole. The radial screw hole is positioned corresponding to the inner hole of the connecting plate 13. The inner hole of the oil injector 14 includes an axial connector hole and a radial connector hole. The upper end of the oil pipe 4 is inserted into the axial connector hole, and the radial connector hole is positioned corresponding to the inner hole of the connecting plate 13. The outer circumferential surface of the screw 12 is also provided with a side hole 12a that communicates with the axial screw hole of the screw 12. There are several side holes 12a and they are evenly arranged along the circumference of the screw 12. The side holes 12a are located between the oil inlet sleeve 11 and the oil pan 2. The upper end of the oil injection connector 14 is provided with a nozzle 14a, which communicates with the axial connector hole.

[0034] like Figure 2 and Figure 5 As shown, the upper main shaft 1 has a thread-taking crank section 1d, and a thread-taking crank 15 is fitted and fixedly connected to the thread-taking crank section 1d. The thread-taking crank 15 is connected to the thread-taking rod. The thread-taking crank 15 is located on the right side of the oil inlet sleeve 11, and a second oil outlet hole 1d1 communicating with the central hole 1a is opened on the outer circumferential surface of the thread-taking crank section 1d.

[0035] When the sewing machine is working, the upper main shaft 1 rotates, thereby driving the needle bar crank 5 to rotate and the thread take-up crank 15 to swing. The rotation of the needle bar crank 5 drives the needle bar 16 to move up and down through the needle bar connecting rod 6. When the oil pump is working, the lubricating oil is delivered upward from the oil tank through the oil pipe 4. The lubricating oil passes through the oil pipe 4, the oil spray connector 14, the connecting plate 13, the screw 12 and the oil inlet sleeve 11 in sequence, and enters the center hole 1a of the upper main shaft 1 through the oil inlet hole 1b. Then it flows to the first oil outlet hole 1c and the second oil outlet hole 1d1. After passing through the first oil outlet hole 1c, it passes through the flow hole 5a and the inner hole of the pin 7 in sequence to enter the raceway of the bearing 8 to lubricate the bearing 8. This achieves forced directional oil supply, which helps to avoid insufficient lubrication at the hinge between the needle bar crank 5 and the needle bar connecting rod 6. The lubricating oil can also lubricate the connection between the needle bar crank 5 and the upper main shaft 1 through the first oil outlet 1c, and the connection between the thread take-up crank 15 and the upper main shaft 1 through the second oil outlet 1d1. The lubricating oil can also lubricate the connection between the pin 7 and the needle bar crank 5 through the overflow hole 5a. Additionally, when the lubricating oil passes through the oil spray connector 14, it can be sprayed upwards through the nozzle 14a to replenish the oil pan 2. When the lubricating oil passes through the screw 12, it can be sprayed outwards through the side hole 12a to lubricate other nearby components. When the lubricating oil passes through the oil inlet sleeve 11, it can overflow outwards through the right opening of the auxiliary groove 11b to lubricate other nearby components. When the lubricating oil passes through the pin 7 and the needle bar crank 5, it can overflow outwards through the auxiliary hole 5b to lubricate other nearby components. These overflow ports in the lubricating oil supply pipe 4 not only prevent excessive lubricating oil at the hinge between the needle bar crank 5 and the needle bar connecting rod 6, but also provide lubrication for other components, which is beneficial to the overall lubrication of the sewing machine. When the lubricating oil passes through the oil inlet hole 1b and the first oil outlet hole 1c, it not only has a filtering effect, keeping the lubricating oil clean, but the oil cotton 9 also temporarily stores the lubricating oil, preventing the lubricating oil in the central hole 1a from flowing away quickly from the oil inlet hole 1b and the first oil outlet hole 1c under the action of gravity. In this way, when the oil pump 3 stops working, the lubricating oil in the central hole 1a can still be continuously supplied to the hinge between the needle bar crank 5 and the needle bar connecting rod 6 through the first oil outlet hole 1c, which helps to avoid insufficient oil supply.

[0036] Example 2

[0037] The connection position of the upper end of the oil pipe 4 differs from that in Embodiment 1. The upper end of the oil pipe 4 can be directly inserted into the insertion hole of the oil inlet sleeve 11, with the oil groove 11a connecting the inner hole of the oil pipe 4 and the oil inlet hole 1b. The injector connector 14, screw 12, and connecting plate 13 are correspondingly omitted. Alternatively, the upper end of the oil pipe 4 can be directly inserted into the radial hole of the screw 12, with the inner hole of the screw 12 connecting the inner hole of the oil pipe 4 and the oil groove 11a. The injector connector 14 and connecting plate 13 are correspondingly omitted. Other structures are the same as in Embodiment 1.

[0038] Example 3

[0039] An oil outlet sleeve is fitted on the left end of the upper spindle 1. The oil outlet sleeve is fixed to the machine housing. The inner circumferential surface of the oil outlet sleeve has an annular groove, which is opposite to the first oil outlet hole 1c. A hose is connected between the oil outlet sleeve and the upper end of the needle rod connecting rod 6, so that the lubricating oil enters the bearing 8 raceway from the first oil outlet hole 1c through the hose. Other structures are the same as in Embodiment 1.

[0040] Example 4

[0041] The insertion hole penetrates the bottom surface of the oil tank 11a, and the other structures are the same as in Embodiment 1.

[0042] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model 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 this utility model or exceeding the scope defined by the appended claims.

Claims

1. A sewing machine with an upper main shaft oil supply, comprising an upper main shaft (1) and an oil pipe (4) connected to an oil pump (3), wherein a needle bar crank (5) is fitted and fixedly connected to the left end of the upper main shaft (1), and a needle bar connecting rod (6) is hinged to the needle bar crank (5), characterized in that, The upper spindle (1) has a central hole (1a). An oil inlet hole (1b) communicating with the central hole (1a) is opened on the outer peripheral surface of the middle part of the upper spindle (1). A first oil outlet hole (1c) communicating with the central hole (1a) is opened on the outer peripheral surface of the left end of the upper spindle (1). The inner hole of the oil pipe (4) is connected to the oil inlet hole (1b). The hinge between the needle crank (5) and the needle connecting rod (6) is connected to the first oil outlet hole (1c). Oil cotton (9) is fixed in both the oil inlet hole (1b) and the first oil outlet hole (1c).

2. The sewing machine with upper spindle oil supply according to claim 1, characterized in that, The needle crank (5) has a flow hole (5a) opposite to the first oil outlet (1c). The needle crank (5) and the needle connecting rod (6) are hinged by a hollow pin (7). The pin (7) is inserted and fixed in the needle crank (5). The needle connecting rod (6) is fitted on the pin (7) and a bearing (8) is provided between the needle connecting rod (6) and the pin (7). The inner hole of the pin (7) connects the raceway of the bearing (8) and the flow hole (5a).

3. The sewing machine with upper spindle oil supply according to claim 2, characterized in that, The outer circumferential surface of the pin (7) is provided with an annular circumferential groove (7a) that communicates with the inner hole of the pin (7), and the flow hole (5a) is positioned corresponding to the circumferential groove (7a).

4. The sewing machine with upper spindle oil supply according to claim 3, characterized in that, An additional hole (5b) corresponding to the position of the circumferential groove (7a) is also provided on the outer peripheral surface of the needle crank (5), and a baffle (10) is fixed above the needle crank (5).

5. The sewing machine with upper spindle oil supply according to any one of claims 1-4, characterized in that, The upper spindle (1) is fitted with an oil inlet sleeve (11) in the middle. The inner circumferential surface of the oil inlet sleeve (11) is provided with an annular oil groove (11a). The oil groove (11a) connects the inner hole of the oil pipe (4) with the oil inlet hole (1b).

6. The sewing machine with upper spindle oil supply according to claim 5, characterized in that, The inner circumferential surface of the oil inlet sleeve (11) is also provided with a spiral-shaped auxiliary groove (11b). The left end of the auxiliary groove (11b) is connected to the oil groove (11a), and the right end of the auxiliary groove (11b) penetrates the right end face of the oil inlet sleeve (11).

7. The sewing machine with upper spindle oil supply according to claim 5, characterized in that, The sewing machine also includes an oil pan (2) fixed above the upper main shaft (1), and a hollow screw (12) is fixed on the oil pan (2). The lower end of the screw (12) is inserted into the oil inlet sleeve (11), and the inner hole of the screw (12) is connected to the inner hole of the oil pipe (4) and the oil groove (11a).

8. The sewing machine with upper spindle oil supply according to claim 7, characterized in that, The upper end of the oil pipe (4) is fixed with an oil injection connector (14), which is inserted and fixed on the oil pan (2). A hollow connecting plate (13) is fixedly connected between the screw (12) and the oil injection connector (14). The inner hole of the connecting plate (13) is connected to the inner hole of the oil injection connector (14) and the inner hole of the screw (12).

9. The sewing machine with upper spindle oil supply according to claim 8, characterized in that, The screw (12) has a side hole (12a) on its outer peripheral surface that communicates with the inner hole of the screw (12). The side hole (12a) is located between the oil inlet sleeve (11) and the oil pan (2). The upper end of the oil injection connector (14) is provided with a nozzle (14a).

10. The sewing machine with upper spindle oil supply according to any one of claims 1-4, characterized in that, The upper main shaft (1) has a thread-picking crank section (1d), and the thread-picking crank section (1d) is fitted and fixedly connected to a thread-picking crank (15). A second oil outlet hole (1d1) communicating with the central hole (1a) is opened on the outer peripheral surface of the thread-picking crank section (1d).

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