Dustproof lower sleeve for transmission shaft of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a dustproof sewing machine transmission shaft lower sleeve which comprises a lower sleeve body, two bearings are fixedly connected to the inner wall of the lower sleeve body, and the same transmission shaft body is fixedly connected to the two bearings. The spring is stretched in the moving process by pulling the T-shaped clamping pin, the T-shaped clamping pin is separated from one of the multiple clamping grooves, the T-shaped rod is rotated in the forward direction to drive the second gear to rotate, the second gear drives the lead screw to rotate through the first gear, the lead screw drives the moving plate to move, and the moving plate drives the sealing cover to move. When the sealing covers are detached, the two sealing covers move in the direction away from each other, the bearing leaks out, at the moment, the pulling force on the T-shaped clamping pin is released, the spring in the stretching state is reset, the spring drives the T-shaped clamping pin to be clamped with the other clamping groove, a worker can add lubricating oil to the bearing conveniently, and when the sealing covers are detached, the sealing covers can be detached conveniently. No professional tool is needed, and operation is easy and convenient.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a dustproof sewing machine drive shaft lower sleeve. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the fabric, so that one or more layers of fabric are interwoven or sewn together. Generally, a sewing machine consists of four parts: the machine head, the machine base, the drive shaft, and accessories. Among them, the lower sleeve plays a key role in the drive shaft.

[0003] Currently, the drive shaft of some sewing machines is typically mounted on the lower sleeve via bearings. While this method provides stable support and rotation of the drive shaft, it has significant shortcomings in dust prevention. Since the bearing area is directly exposed to the external environment, it is susceptible to the intrusion of dust, fiber debris, and other impurities, leading to accelerated bearing wear. This, in turn, affects the rotational accuracy and stability of the drive shaft, shortening the machine's lifespan. To improve this situation, some sewing machines are designed with a sealing cover bolted to the outside of the drive shaft sleeve to attempt dust prevention. However, while this design reduces dust intrusion to some extent, the sealing cover is bolted in place, making disassembly relatively cumbersome and requiring specialized tools. This not only increases the difficulty and time cost of maintenance but also makes adding lubricant to the bearing extremely inconvenient. Therefore, we propose a dustproof lower sleeve for the sewing machine drive shaft to solve the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a dustproof sewing machine drive shaft lower sleeve, which solves the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0008] A dustproof sewing machine drive shaft lower sleeve includes a lower sleeve body. Two bearings are fixedly connected to the inner wall of the lower sleeve body, and the same drive shaft body is fixedly connected to the two bearings. Two rectangular blocks are welded to the top of the lower sleeve body, and a lead screw is rotatably connected to each rectangular block. A first gear is fixedly connected to the end of each lead screw. A U-shaped seat is welded to the top of the lower sleeve body, and a T-shaped rod is rotatably connected to the top of the U-shaped seat. The end of the T-shaped rod extends below the U-shaped seat and is fixedly connected to a second gear. The second gear meshes with the first gear. A movable plate is threaded onto the lead screw. Both ends of the lower sleeve body are provided with sealing covers. The sealing covers are sleeved on the transmission shaft body. The top of the sealing cover is fixedly connected to the bottom of the corresponding movable plate. A T-shaped pin is provided on the T-shaped rod. The top of the U-shaped seat has multiple slots in an annular shape. The T-shaped pin engages with one of the multiple slots. A spring is fixedly connected between the bottom inner wall of the T-shaped pin and the top of the T-shaped rod. The spring is movably sleeved on the T-shaped pin.

[0009] Furthermore, two sliding grooves are formed on the top of the lower sleeve body, and guide rods are welded between the inner walls of the two sides of the sliding grooves.

[0010] Furthermore, a slider is slidably connected to the guide rod, and the top of the slider is fixedly connected to the bottom of the corresponding movable plate.

[0011] Furthermore, two limiting grooves are provided on both sides of the lower sleeve body, and limiting blocks are slidably connected to the limiting grooves.

[0012] Furthermore, an L-shaped plate is welded to one side of the limiting block, and one side of the L-shaped plate is fixedly connected to the other side of the corresponding sealing cover.

[0013] Furthermore, the movable plate is provided with a threaded groove, and the movable plate is threadedly connected to the corresponding lead screw through the threaded groove.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, this utility model provides a dustproof sewing machine drive shaft lower sleeve, which has the following beneficial effects:

[0016] This invention utilizes a T-shaped locking pin to stretch a spring during movement. The T-shaped locking pin separates from one of the multiple locking slots. Rotating the T-shaped rod forward drives the second gear to rotate, which in turn drives the lead screw via the first gear. The lead screw then moves the moving plate, which in turn moves the sealing cover, causing the two sealing covers to move away from each other, thus exposing the bearing. Releasing the tension on the T-shaped locking pin allows the stretched spring to return to its original position. The spring then engages the T-shaped locking pin with another slot, facilitating the addition of lubricant to the bearing. Furthermore, no specialized tools are required to disassemble the sealing cover, making the operation simple and convenient. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the sealing cover of this utility model after it has been moved.

[0019] Figure 3 This is a partial three-dimensional structural diagram of the present invention;

[0020] Figure 4 This is a three-dimensional structural diagram of the U-shaped seat, T-shaped locking pin, and spring connection of this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the connection between the U-shaped seat, the first gear, the second gear, and the lead screw of this utility model.

[0022] In the diagram: 1. Lower sleeve body; 2. Bearing; 3. Drive shaft body; 4. Rectangular block; 5. Lead screw; 6. First gear; 7. U-shaped seat; 8. T-shaped rod; 9. Second gear; 10. Moving plate; 11. Sealing cover; 12. Slot; 13. T-shaped pin; 14. Spring; 15. Slide groove; 16. Guide rod; 17. Slider; 18. L-shaped plate; 19. Limiting groove; 20. Limiting block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example

[0025] like Figure 1-5As shown, an embodiment of this utility model discloses a dustproof sewing machine drive shaft lower sleeve, including a lower sleeve body 1. Two bearings 2 are fixedly connected to the inner wall of the lower sleeve body 1, and the same drive shaft body 3 is fixedly connected to the two bearings 2. Two rectangular blocks 4 are welded to the top of the lower sleeve body 1, and a lead screw 5 is rotatably connected to the rectangular blocks 4. A first gear 6 is fixedly connected to the end of the lead screw 5. A U-shaped seat 7 is welded to the top of the lower sleeve body 1, and a T-shaped rod 8 is rotatably connected to the top of the U-shaped seat 7. The end of the T-shaped rod 8 extends to the bottom of the U-shaped seat 7. A second gear 9 is fixedly connected to the first gear 6. A movable plate 10 is threaded onto the lead screw 5. Both ends of the lower sleeve body 1 are provided with sealing covers 11, which are fitted onto the transmission shaft body 3. The top of the sealing cover 11 is fixedly connected to the bottom of the corresponding movable plate 10. A T-shaped pin 13 is provided on the T-shaped rod 8. The top of the U-shaped seat 7 has multiple slots 12 in an annular shape. The T-shaped pin 13 engages with one of the slots 12. The bottom inner wall of the T-shaped pin 13 is close to the top of the T-shaped rod 8. A spring 14 is fixedly connected and movably sleeved on a T-shaped locking pin 13. Two sealing covers 11 seal the spring 14, preventing the intrusion of dust, fiber debris, and other impurities. When lubricating oil needs to be added to the bearing 2, the T-shaped locking pin 13 is pulled. During this movement, the T-shaped locking pin 13 stretches the spring 14, simultaneously separating it from one of the multiple locking slots 12. Then, the T-shaped rod 8 rotates forward, driving the second gear 9 to rotate. The second gear 9, through the first gear 6, drives the lead screw 5 to rotate. 5 drives the corresponding moving plate 10 to move, the moving plate 10 drives the corresponding slider 17 to slide on the corresponding guide rod 16, and at the same time the moving plate 10 drives the corresponding sealing cover 11 to move, so that the two sealing covers 11 move away from each other, so that the bearing 2 is exposed. At this time, the tension on the T-shaped locking pin 13 is released, and the spring 14 in the stretched state returns to its original state. Under the action of the spring 14's own elastic force, the spring 14 drives the T-shaped locking pin 13 to engage with another slot 12 among the multiple slots 12, so that the staff can easily add lubricating oil to the bearing 2.

[0026] In some embodiments, two grooves 15 are provided on the top of the lower sleeve body 1, and guide rods 16 are welded between the inner walls of the two sides of the grooves 15.

[0027] In some embodiments, a slider 17 is slidably connected to the guide rod 16, and the top of the slider 17 is fixedly connected to the bottom of the corresponding movable plate 10. The guide rod 16 serves as a limit.

[0028] In some embodiments, two limiting grooves 19 are provided on both sides of the lower sleeve body 1, and limiting blocks 20 are slidably connected on the limiting grooves 19.

[0029] In some embodiments, an L-shaped plate 18 is welded to one side of the limiting block 20, and one side of the L-shaped plate 18 is fixedly connected to the other side of the corresponding sealing cover 11. The L-shaped plate 18 limits the sealing cover 11.

[0030] In some embodiments, the movable plate 10 is provided with a threaded groove, and the movable plate 10 is threadedly connected to the corresponding lead screw 5 through the threaded groove. The movable plate 10 serves as a connection.

[0031] The working principle or structural principle is as follows: During use, two sealing covers 11 seal the bearing to prevent the intrusion of dust, fiber debris, and other impurities. When lubricating oil needs to be added to bearing 2, the T-shaped locking pin 13 is pulled. During the movement of the T-shaped locking pin 13, the spring 14 is stretched, and the T-shaped locking pin 13 separates from one of the multiple locking slots 12. Then, the T-shaped rod 8 is rotated forward, driving the second gear 9 to rotate. The second gear 9 drives the lead screw 5 to rotate through the first gear 6. The lead screw 5 drives the corresponding moving plate 10 to move. The moving plate 10 drives the corresponding slider 17 to slide on the corresponding guide rod 16. At the same time, the moving plate 10 drives the corresponding sealing cover 11 to move, making... The two sealing covers 11 move away from each other, causing the bearing 2 to be exposed. At this time, the tension on the T-shaped locking pin 13 is released, and the spring 14, which is in a stretched state, returns to its original position. Under the action of the spring 14's own elasticity, the spring 14 drives the T-shaped locking pin 13 to engage with another slot 12 among the multiple slots 12, making it easier for the operator to add lubricating oil to the bearing 2. After adding oil, the T-shaped locking pin 13 is pulled again. During the movement, the T-shaped locking pin 13 stretches the spring 14, and at the same time, the T-shaped locking pin 13 separates from one of the multiple slots 12. Then, the T-shaped rod 8 is rotated in the opposite direction, causing the two sealing covers 11 to move closer to each other, thus sealing and preventing dust.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dustproof sewing machine drive shaft lower sleeve, comprising a lower sleeve body (1), characterized in that: Two bearings (2) are fixedly connected to the inner wall of the lower sleeve body (1), and the same transmission shaft body (3) is fixedly connected to the two bearings (2). Two rectangular blocks (4) are welded to the top of the lower sleeve body (1), and a lead screw (5) is rotatably connected to the rectangular blocks (4). A first gear (6) is fixedly connected to the end of the lead screw (5). A U-shaped seat (7) is welded to the top of the lower sleeve body (1), and a T-shaped rod (8) is rotatably connected to the top of the U-shaped seat (7). The end of the T-shaped rod (8) extends to the bottom of the U-shaped seat (7) and is fixedly connected to a second gear (9). The second gear (9) meshes with the first gear (6). The upper sleeve body (1) is threaded with a movable plate (10). Both ends of the lower sleeve body (1) are provided with sealing covers (11). The sealing covers (11) are sleeved on the transmission shaft body (3). The top of the sealing cover (11) is fixedly connected to the bottom of the corresponding movable plate (10). The T-shaped rod (8) is provided with a T-shaped pin (13). The top of the U-shaped seat (7) is provided with multiple slots (12) in an annular shape. The T-shaped pin (13) is engaged with one of the slots (12). The bottom inner wall of the T-shaped pin (13) is fixedly connected to the top of the T-shaped rod (8) with a spring (14). The spring (14) is movably sleeved on the T-shaped pin (13). The top of the lower sleeve body (1) has two sliding grooves (15), and guide rods (16) are welded between the inner walls of the two sides of the sliding grooves (15). A slider (17) is slidably connected to the guide rod (16), and the top of the slider (17) is fixedly connected to the bottom of the corresponding moving plate (10). Two limiting grooves (19) are provided on both sides of the lower sleeve body (1), and a limiting block (20) is slidably connected on the limiting groove (19). An L-shaped plate (18) is welded to one side of the limiting block (20), and one side of the L-shaped plate (18) is fixedly connected to the other side of the corresponding sealing cover (11). The movable plate (10) is provided with a threaded groove, and the movable plate (10) is threadedly connected to the corresponding lead screw (5) through the threaded groove.

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