A button-sewing machine thread-cutting mechanism
By improving the installation method of the thread-cutting stepper motor of the button sewing machine to be built into the servo motor, the problems of space limitation and the impact of external motor on aesthetics are solved, and the effects of motor stability and noise reduction are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 阮建兵
- Filing Date
- 2025-08-26
- Publication Date
- 2026-06-30
AI Technical Summary
Due to space constraints, the thread-cutting mechanism of existing button sewing machines requires the thread-cutting motor to be installed below the end of the sewing machine, which affects the expansion of the main motor's functions. Furthermore, the thread-cutting main shaft that runs through the base is quite long, resulting in high costs and inconvenient assembly. The external motor also affects the aesthetics.
The wire-cutting stepper motor was moved from the back of the machine head to below the servo motor and mounted together with the servo motor on the connector. The motor was built into the casing, and the motor distribution was improved to enhance stability and aesthetics.
This achieves improved motor stability and reduced noise, a more aesthetically pleasing appearance, and a simplified assembly process.
Smart Images
Figure CN224430940U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to sewing machine technology, specifically a button-attaching machine thread-cutting mechanism. Background Technology
[0002] Currently, most industrial sewing machines have an automatic thread-cutting function, and the automatic thread-cutting mechanism is usually located on the base under the table. However, due to the limited space under the table of button sewing machines, it is impossible to install an independent thread-cutting mechanism. Therefore, the cutting mechanism is driven by an external drive mechanism. The common practice is to install the thread-cutting motor below the main motor at the end of the sewing machine. Then, the thread-cutting motor drives a thread-cutting main shaft that runs through the base to achieve automatic thread cutting. The thread-cutting drive is located below the main motor, which limits the expansion of the main motor's functions. The thread-cutting main shaft that runs through the base is relatively long, which is costly and inconvenient to assemble.
[0003] To this end, utility model disclosure CN221480264U discloses an automatic thread-cutting mechanism for a button-attaching machine, including a machine head and a base. One end of the machine head is connected to the base via a connecting seat. A thread-cutting motor is arranged on the back of the connecting seat near the top. The thread-cutting motor is electrically connected to the electrical control of the button-attaching machine. A transmission cavity is opened below the thread-cutting motor on the back of the connecting seat. A horizontally arranged upper transmission lever is pivotally connected in the transmission cavity. The rear end of the upper transmission lever is movably connected to the output end of the upper thread-cutting motor via an upper connecting rod. The device has a lower connecting rod that passes through the base and is pivotally connected to a lower transmission lever. The lower connecting rod is movably connected to the rear end of the lower transmission lever. A wire-cutting spindle is pivotally connected inside the base, and an input arm is mounted on the spindle. The input arm engages with the front end of the lower transmission lever. A movable blade is mounted at the front end of the wire-cutting spindle, and the movable blade engages with a fixed blade. This wire-cutting mechanism is driven by an external stepper motor. The stepper motor is mounted on the back of the head connector near the top. The stepper motor protrudes outward, occupying the mounting space on the rear side of the head, which makes the overall appearance less aesthetically pleasing. Utility Model Content
[0004] The purpose of this utility model is to provide a thread cutting mechanism for a button sewing machine. The stepper motor that drives the thread cutting mechanism is located below the servo motor at the end of the machine head. The servo motor and the stepper motor are jointly mounted on the connecting seat at the end of the machine head, resulting in better overall stability of the machine head and lower vibration and noise during operation.
[0005] To achieve the above objectives, the following technical solution is adopted:
[0006] A button-attaching machine thread-cutting mechanism includes a machine head and a base. One end of the machine head and the base are connected by a connecting part. A connecting seat is provided on the other side of the connecting part opposite to the machine head. A servo motor is provided on the connecting seat and coaxially connected to the main shaft of the machine head. The mechanism is characterized by: a thread-cutting stepper motor being provided below the servo motor on the connecting seat; a transmission cavity being opened on the back of the connecting part; a horizontally arranged upper transmission lever pivotally connected within the transmission cavity; the rear end of the upper transmission lever being movably connected to the drive arm at the output end of the thread-cutting stepper motor via a first connecting rod; the front end of the upper transmission lever being movably connected to a second connecting rod; the second connecting rod passing through the interior of the base; a lower transmission lever pivotally connected within the base; the second connecting rod being movably connected to the rear end of the lower transmission lever; a thread-cutting main shaft pivotally connected within the base; an input arm on the thread-cutting main shaft; the input arm cooperating with the front end of the lower transmission lever; and a movable blade at the front end of the thread-cutting main shaft cooperating with a fixed blade.
[0007] The wire-cutting stepper motor shaft is horizontally set and perpendicular to the servo motor shaft. A drive arm is fixedly connected to the output shaft of the wire-cutting stepper motor, and the end of the drive arm is hinged to the second connecting rod.
[0008] This invention moves the wire-cutting stepper motor from the back of the machine head to below the servo motor and mounts it on the connecting base. This arrangement allows for a cover to be fitted over both the wire-cutting stepper motor and the servo motor, housing both motors together within the cover, resulting in a more aesthetically pleasing appearance. Furthermore, the servo motor and the stepper motor are both mounted on the connecting base at the end of the machine head, with the machine head and drive motor distributed on both sides of the connection, leading to better stability and lower vibration and noise during operation. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the structure of this utility model;
[0010] Figure 2 This is a schematic diagram of the bottom structure of this utility model. Detailed Implementation
[0011] like Figure 1 , 2As shown, a button-attaching machine thread-cutting mechanism includes a head 1 and a base 2. One end of the head 1 and the base 2 are connected by a connecting part 3. A connecting seat 4 is provided on the other side of the connecting part 3 opposite to the head. A servo motor 5 is provided on the connecting seat 4. The servo motor 5 is coaxially connected to the main shaft of the head 1. The key feature is that a thread-cutting stepper motor 6 is also provided below the servo motor 5 on the connecting seat 4. The shaft of the thread-cutting stepper motor 6 is horizontally arranged and perpendicular to the shaft of the servo motor 5. A drive arm 63 is fixedly connected to the output shaft of the thread-cutting stepper motor 6. A transmission cavity 31 is opened on the back of the connecting part 3. A horizontal drive arm 63 is pivotally connected in the transmission cavity 31. An upper transmission lever 61 is provided, with its rear end movably connected to the drive arm 63 at the output end of the wire-cutting stepper motor 6 via a first connecting rod 62. The front end of the upper transmission lever 61 is movably connected to a second connecting rod 64, which passes through into the base 2. A lower transmission lever 65 is pivotally connected inside the base 2, with the rear end of the second connecting rod 64 movably connected to the lower transmission lever 65. A wire-cutting spindle 21 is pivotally connected inside the base 2, with an input arm 22 on it. The input arm 22 engages with the front end of the lower transmission lever 65. A movable blade 23 is provided at the front end of the wire-cutting spindle 21, which engages with a fixed blade 24.
[0012] This invention moves the wire-cutting stepper motor from the back of the machine head to below the servo motor and mounts it on the connecting base. This arrangement allows for a cover to be fitted over both the wire-cutting stepper motor and the servo motor, housing both motors together within the cover, resulting in a more aesthetically pleasing appearance. Furthermore, the servo motor and the stepper motor are both mounted on the connecting base at the end of the machine head, with the machine head and drive motor distributed on both sides of the connection, leading to better stability and lower vibration and noise during operation.
Claims
1. A button-sewing machine thread-cutting mechanism, comprising a head (1) and a base (2), one end of the head (1) and the base (2) being connected by a connecting part (3), a connecting seat (4) being provided on the other side of the connecting part (3) opposite to the head, a servo motor (5) being provided on the connecting seat (4), the servo motor (5) being coaxially connected to the main shaft of the head (1), characterized in that: Below the position servo motor (5) on the connecting seat (4), a wire-cutting stepper motor (6) is also provided. A transmission cavity (31) is opened on the back of the connecting part (3). A horizontally arranged upper transmission lever (61) is pivotally connected in the transmission cavity (31). The rear end of the upper transmission lever (61) is movably connected to the drive arm (63) at the output end of the wire-cutting stepper motor (6) through the first connecting rod (62). The front end of the upper transmission lever (61) is movably connected to the second connecting rod (64). 4) Pass through to the inside of the base (2). The base (2) is pivotally connected to the lower transmission lever (65). The second connecting rod (64) is movably connected to the rear end of the lower transmission lever (65). The base (2) is pivotally connected to the wire cutting spindle (21). The wire cutting spindle (21) is provided with an input arm (22). The input arm (22) cooperates with the front end of the lower transmission lever (65). The front end of the wire cutting spindle (21) is provided with a movable blade (23). The movable blade (23) cooperates with the fixed blade (24).
2. The button-sewing machine thread-cutting mechanism as described in claim 1, characterized in that: The shaft of the wire-cutting stepper motor (6) is horizontally set and perpendicular to the shaft of the servo motor (5). The drive arm (63) is fixedly connected to the output shaft of the wire-cutting stepper motor (6), and the end of the drive arm (63) is hinged to the first connecting rod.