A sewing machine needle bar drive mechanism

Abstract

This utility model discloses a sewing machine needle bar drive mechanism, including: a motor, a transmission shaft, a transmission component, a transmission assembly, and a needle bar. A drive wheel is connected to the output shaft of the motor, and a driven wheel is connected to the transmission shaft. The transmission component is connected to both the drive wheel and the driven wheel. The ratio of the diameter of the drive wheel to the diameter of the driven wheel is 1:1.5-3. One end of the transmission assembly is connected to the transmission shaft, and the other end is connected to the needle bar. Using this technical solution, a greater output torque can be provided. When a needle is fixed to the lower end of the needle bar, the piercing force of the needle can be increased, facilitating the piercing and sewing of thicker fabrics and the use of thicker threads. The production cost of this drive mechanism is basically the same as the original cost, without increasing production costs. It is suitable for sewing thicker fabrics and thicker threads, and its performance is good.

Description

Technical Field

[0001] This utility model relates to the technical field of sewing machines, and in particular to a sewing machine needle bar drive mechanism. Background Technology

[0002] The existing mechanism for driving the needle bar to move up and down on a sewing machine generally includes a motor, a drive shaft, a transmission assembly, and a needle bar. The synchronous pulley connected to the output shaft of the motor is the same as the synchronous pulley connected to the drive shaft. A synchronous belt is connected to the two synchronous pulleys. One end of the transmission assembly is connected to the drive shaft, and the other end is connected to the needle bar. The motor drives the drive shaft to rotate through the two synchronous pulleys and the synchronous belt of the same specification. The drive shaft drives the needle bar to move up and down through the transmission assembly (a similar structure is disclosed in Chinese patent CN221000096U). Although this type of drive mechanism can achieve the up and down movement of the needle bar, and the needle bar drives the needle to move up and down for sewing, it is difficult for this type of mechanism to pierce thick fabrics when driving the needle to move. It is also difficult to pierce the fabric when the needle is using a thick thread. In order for the needle to pierce the fabric smoothly, a motor with higher power and torque is required, which increases the production cost. Utility Model Content

[0003] In order to overcome the existing technical defects, the purpose of this utility model is to provide a sewing machine needle bar drive mechanism to solve the above-mentioned technical problems.

[0004] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0005] According to one aspect of this utility model, a sewing machine needle bar drive mechanism is designed, comprising: a motor, a transmission shaft, a transmission component, a transmission assembly, and a needle bar. A drive wheel is connected to the output shaft of the motor, and a driven wheel is connected to the transmission shaft. The transmission component is connected to the drive wheel and the driven wheel. The ratio of the diameter of the drive wheel to the diameter of the driven wheel is 1:1.5-3. One end of the transmission assembly is connected to the transmission shaft, and the other end is connected to the needle bar.

[0006] By adopting the above technical solution, and controlling the ratio of the diameter of the driving wheel to that of the driven wheel to be 1:1.5-3, a transmission structure is constructed in which the driving wheel is a small wheel and the driven wheel is a large wheel. Driven by the same type of motor, the small driving wheel drives the large driven wheel to rotate through the transmission components, thereby driving the transmission shaft to rotate. This can provide greater output torque. When a machine needle is fixed to the lower end of the needle bar, the piercing force of the needle can be increased, making it easier to pierce and sew thicker fabrics and use thicker threads. The production cost of this drive mechanism is basically the same as the original cost, without increasing production costs. It is suitable for sewing thicker fabrics and thicker threads, and the performance is good.

[0007] To better address the aforementioned technical deficiencies, this utility model also offers a superior technical solution:

[0008] In some embodiments, the transmission assembly includes a wheel fixed to the end of the transmission shaft, a connecting shaft eccentrically connected to the wheel, a connector fixed to the needle bar, and a swing arm with one end rotatably engaged with the connecting shaft and the other end rotatably engaged with the connector.

[0009] In some embodiments, the needle bar and the needle bar holder slide vertically together.

[0010] In some embodiments, a slider is fixedly connected to the end of the connector, and the slider slides in cooperation with a vertically arranged groove on the needle bar frame.

[0011] In some embodiments, a fixing block is fixedly connected to the needle bar holder, and the sliding groove is provided on the fixing block.

[0012] In some embodiments, both the driving wheel and the driven wheel are synchronous pulleys, and the ratio of their wheel diameters is 1:2, and the transmission component is a synchronous belt.

[0013] In some embodiments, both the driving wheel and the driven wheel are gears, and the ratio of their wheel diameters is 1:2, and the transmission component is a chain. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of a sewing machine needle bar drive mechanism according to one embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the transmission assembly.

[0016] Figure 3 This is an exploded structural diagram of the transmission assembly;

[0017] Figure label:

[0018] 1. Motor; 2. Drive shaft; 3. Transmission component; 4. Transmission assembly; 41. Rotary wheel; 42. Connecting shaft; 43. Connecting component; 44. Swing arm; 45. Slider; 5. Needle bar; 6. Driving wheel; 7. Driven wheel; 8. Needle bar holder; 9. Fixing block; 91. Slide groove. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as setting, installing, connecting, and fixing should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] refer to Figures 1 to 3 As shown, this utility model provides a sewing machine needle bar drive mechanism. This drive mechanism is applied to a sewing machine to assist in sewing auxiliary materials. The sewing machine needle bar drive mechanism includes: a motor 1, a transmission shaft 2, a transmission component 3, a transmission assembly 4, and a needle bar 5.

[0023] Motor 1 is a servo motor or a stepper motor. A drive wheel 6 is fixedly connected to the output shaft of motor 1, and a driven wheel 7 is fixedly connected to the transmission shaft 2. The transmission component 3 is connected to the drive wheel 6 and the driven wheel 7. The ratio of the diameter of the drive wheel 6 to the diameter of the driven wheel 7 is 1:1.5-3. Further, the ratio of the diameter of the drive wheel 6 to the diameter of the driven wheel 7 is 1:1.5, 1:2, 1:2.5, or 1:3. In this embodiment, the ratio of the diameter of the drive wheel 6 to the diameter of the driven wheel 7 is preferably 1:2. When both the drive wheel 6 and the driven wheel 7 are synchronous pulleys, the transmission component 3 is a synchronous belt. When both the drive wheel 6 and the driven wheel 7 are gears, the transmission component 3 is a chain. In this embodiment, when both the drive wheel 6 and the driven wheel 7 are synchronous pulleys, the transmission component 3 is a synchronous belt.

[0024] One end of the transmission assembly 4 is connected to the transmission shaft 2, and the other end is connected to the needle bar 5. The needle bar 5 and the needle bar holder 8 slide vertically together. The transmission assembly 4 includes a rotating wheel 41 fixed to the end of the transmission shaft 2, a connecting shaft 42 eccentrically fixed to the rotating wheel 41, a connecting piece 43 fixedly connected to the needle bar 5, and a swing arm 44 with one end rotatably connected to the connecting shaft 42 and the other end rotatably connected to the connecting piece 43. A slider 45 is fixedly connected to the end of the connecting piece 43. A fixing block 9 is fixedly connected to the needle bar holder 8. A vertically arranged sliding groove 91 is provided on the fixing block 9, and the slider 45 slides vertically with the sliding groove 91. A machine needle is connected to the lower end of the needle bar 5.

[0025] When motor 1 drives transmission shaft 2 to rotate through drive wheel 6, driven wheel 7 and transmission component 3, the rotation of transmission shaft 2 drives wheel 41 to rotate, the rotation of wheel 41 drives connecting shaft 42 to rotate circumferentially, the circumferential rotation of connecting shaft 42 drives the upper end of swing arm 44 to swing circumferentially, and the linkage connecting component 43 moves up and down, the slider 45 moves up and down in the slide groove 91, and then the linkage needle rod 5 moves up and down.

[0026] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A sewing machine needle bar drive mechanism, characterized in that, include: The device comprises a motor, a drive shaft, a transmission component, a transmission assembly, and a needle bar. The output shaft of the motor is connected to a drive wheel, and the drive shaft is connected to a driven wheel. The transmission component is connected to the drive wheel and the driven wheel. The ratio of the diameter of the drive wheel to the diameter of the driven wheel is 1:1.5-3. One end of the transmission assembly is connected to the drive shaft, and the other end is connected to the needle bar.

2. The sewing machine needle bar drive mechanism according to claim 1, characterized in that, The transmission assembly includes a wheel fixed to the end of the transmission shaft, a connecting shaft eccentrically connected to the wheel, a connector fixed to the needle bar, and a swing arm with one end rotatably engaged with the connecting shaft and the other end rotatably engaged with the connector.

3. The sewing machine needle bar drive mechanism according to claim 2, characterized in that, The needle bar and the needle bar holder slide together vertically.

4. A sewing machine needle bar drive mechanism according to claim 3, characterized in that, The connector has a slider fixed to its end, and the slider slides in conjunction with a vertically arranged groove on the needle bar frame.

5. A sewing machine needle bar drive mechanism according to claim 4, characterized in that, A fixing block is fixedly connected to the needle bar frame, and the sliding groove is provided on the fixing block.

6. A sewing machine needle bar drive mechanism according to claim 1, characterized in that, Both the driving wheel and the driven wheel are synchronous pulleys, and the ratio of their wheel diameters is 1:

2. The transmission component is a synchronous belt.

7. A sewing machine needle bar drive mechanism according to claim 1, characterized in that, Both the driving wheel and the driven wheel are gears, and the ratio of their wheel diameters is 1:

2. The transmission component is a chain.

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