Sewing machine with lower shaft device directly driven by servo motor
By directly driving the lower shaft device with a servo motor, the problems of complex structure and inconvenient adjustment of the lower shaft in existing sewing machines are solved, achieving structural simplification and convenient adjustment, avoiding the defects of synchronous belt drive, and improving the operational stability of the sewing machine.
Patent Information
- Application Number
- CN202423222684.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2034-12-26
AI Technical Summary
The existing sewing machine has a complex lower shaft structure, high cost, inconvenient adjustment, and is prone to problems such as thread slippage and detachment, mainly due to the synchronous belt drive and mechanical adjustment method.
The lower shaft device is directly driven by a servo motor. By adjusting the time difference between the lower and upper servo motors, the time difference between the movement of the rotary hook and needle bar assembly is achieved, thereby adjusting the hook angle, simplifying the structure and improving the convenience of adjustment.
It simplifies the sewing machine structure, reduces costs, improves the convenience of adjusting the hook angle, and avoids problems such as thread slippage and derailment caused by tension errors in synchronous belt drives.
Smart Images
Figure CN223893020U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a sewing machine, specifically a sewing machine in which a servo motor directly drives the lower shaft device. Background Technology
[0002] The existing sewing machine uses a timing belt to connect the lower shaft to the main shaft (upper shaft), which presents the following problems: 1. Because it shares the same motor with the main shaft, all timing belts and timing gears require a separation structure (clutch) to prevent the main shaft from jamming. Additionally, a rotary hook adjustment mechanism is needed to adjust the hook angle, making the overall structure complex, increasing costs, and making assembly inconvenient. 2. Since the hook angle is adjusted mechanically, the machine must be stopped, the large cover opened, and the fastening screws loosened for adjustment, which is very inconvenient. 3. Furthermore, because a timing belt is used for power transmission, and timing belts have tension errors, occasional problems such as thread slippage or slack may occur. Utility Model Content
[0003] In view of the above-mentioned defects in the prior art, the purpose of this utility model is to provide a sewing machine with a servo motor directly driving the lower shaft device.
[0004] The technical solution of this utility model is: a sewing machine with a servo motor directly driving the lower shaft device, which includes a sewing machine base and a rotary hook. A lower servo motor is fixed on the sewing machine base. The lower servo motor is connected to a lower main shaft that extends left and right. A lower shaft transmission gear is fixed on the lower main shaft. A rotary hook is fixedly connected to a rotary hook transmission rod that extends up and down. A rotary hook transmission gear is fixed at the lower end of the rotary hook transmission rod. The rotary hook transmission gear meshes with the lower shaft transmission gear.
[0005] Furthermore, both the shuttle drive gear and the lower shaft drive gear are bevel gears.
[0006] Furthermore, it also includes a sewing machine housing, with an upper servo motor mounted on the upper end of the housing. The upper servo motor is connected to an upper main shaft that extends to the left and right, and the upper main shaft is connected to a needle bar assembly.
[0007] The sewing machine using the servo motor directly driving the lower shaft device provided by this utility model has the following advantages: the lower servo motor drives the lower main shaft to rotate, the lower main shaft drives the lower shaft transmission gear to rotate, the lower shaft transmission gear drives the rotary hook transmission gear to rotate, the rotary hook transmission gear drives the rotary hook transmission rod to rotate, and the rotary hook transmission rod drives the rotary hook to rotate. Because the lower main shaft is driven by an independent lower servo motor, the time difference between the lower servo motor and the upper servo motor can be adjusted to adjust the time difference between the movement of the rotary hook and the needle bar assembly, thereby adjusting the hook angle. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0009] Figure 2 This is a schematic diagram of the structure of the present invention after removing the sewing machine base and the sewing machine casing.
[0010] The diagram shows: 1—sewing machine base, 2—hook, 3—lower servo motor, 4—lower spindle, 5—lower shaft drive gear, 6—hook drive rod, 7—hook drive gear, 8—sewing machine housing, 9—upper servo motor, 10—upper spindle, 11—needle bar assembly. Detailed Implementation
[0011] To provide a more intuitive and complete understanding of the technical solution of this utility model, the following non-limiting features are described in conjunction with the accompanying drawings:
[0012] like Figure 1 , Figure 2 As shown, a sewing machine with a servo motor directly driving a lower shaft device includes a sewing machine base 1 and a rotary hook 2. A lower servo motor 3 is fixed on the sewing machine base 1, and the lower servo motor 3 is connected to a lower main shaft 4 extending horizontally. A lower shaft transmission gear 5 is fixed on the lower main shaft 4. The rotary hook 2 is fixedly connected to a rotary hook transmission rod 6 extending vertically. A rotary hook transmission gear 7 is fixed at the lower end of the rotary hook transmission rod 6, and the rotary hook transmission gear 7 meshes with the lower shaft transmission gear 5. Both the rotary hook transmission gear 7 and the lower shaft transmission gear 5 are bevel gears.
[0013] The sewing machine that directly drives the lower shaft device with a servo motor also includes a sewing machine housing 8. An upper servo motor 9 is installed on the upper end of the sewing machine housing 8. The upper servo motor 9 is connected to an upper main shaft 10 that extends to the left and right. The upper main shaft 10 is connected to a needle bar assembly 11.
[0014] During operation, the lower servo motor 3 drives the lower spindle 4 to rotate, the lower spindle 4 drives the lower shaft transmission gear 5 to rotate, the lower shaft transmission gear 5 drives the rotary hook transmission gear 7 to rotate, the rotary hook transmission gear 7 drives the rotary hook transmission rod 6 to rotate, and the rotary hook transmission rod 6 drives the rotary hook 2 to rotate. Because the lower spindle 4 is driven by an independent lower servo motor 3, the time difference between the lower servo motor 3 and the upper servo motor 9 can be adjusted to adjust the time difference between the movement of the rotary hook 2 and the needle bar assembly 11, thereby adjusting the hook angle.
[0015] Of course, the above are only preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any simple modifications and equivalent structural changes made based on the contents of the present utility model specification and drawings should also be included within the patent protection scope of the present utility model.
Claims
1. A sewing machine with a servo motor directly driving a lower shaft device, comprising a sewing machine base and a rotary hook, characterized in that: The sewing machine base is equipped with a lower servo motor, which is connected to a lower main shaft extending to the left and right. A lower shaft drive gear is fixed on the lower main shaft. A rotary hook is fixedly connected to a rotary hook drive rod extending to the right and left. A rotary hook drive gear is fixed at the lower end of the rotary hook drive rod and meshes with the lower shaft drive gear. The machine also includes a sewing machine housing, with an upper servo motor mounted on the upper end of the housing. The upper servo motor is connected to an upper main shaft extending to the left and right, and the upper main shaft is connected to a needle bar assembly.
2. A sewing machine with a servo motor directly driving the lower shaft device according to claim 1, characterized in that: Both the shuttle drive gear and the lower shaft drive gear are bevel gears.