Presser foot mechanism of sewing machine

Abstract

The utility model discloses a presser foot mechanism of a sewing machine, which relates to the technical field of sewing machines and comprises a driving motor, a driving end of the driving motor is connected with a transmission shaft rod, one end of the transmission shaft rod deviating from the driving motor is provided with an end cover, the edge of the end cover is rotatably connected with a connecting arm, and the bottom end of the connecting arm is rotatably connected with a lifting seat. A presser foot connecting rod is installed in the lifting base, and the bottom end of the presser foot connecting rod is connected with a presser foot. According to the sewing machine presser foot mechanism, the transmission shaft rod is driven to rotate through the motor, and then the connecting arm, the lifting base, the presser foot connecting rod and the presser foot are driven to integrally ascend and descend. By means of the design, automatic adjustment of the height of the presser foot is achieved, and stability and accuracy of the presser foot in the lifting process are guaranteed through precise assembly and connection. Especially in the aspect of adjusting the height of the presser foot, the height of the presser foot can be freely adjusted between 0 and D through circular motion of the connecting arm, and the adjusting precision and flexibility are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a presser foot mechanism of a sewing machine. Background Art

[0002] In the sewing machine industry, the presser foot mechanism is a crucial component of the machine. Its primary function is to compress and release the sewing material, ensuring stability and accuracy during the sewing process. Traditional sewing machine presser foot mechanisms mostly utilize a simple lifting mechanism, allowing manual or mechanical adjustment of the presser foot's height to accommodate sewing materials of varying thicknesses and materials. However, these traditional presser foot mechanisms often suffer from complex operation, low adjustment accuracy, and poor stability, severely impacting sewing efficiency and quality. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention provides a presser foot mechanism for a sewing machine, which solves the problems raised by the above-mentioned background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a sewing machine presser foot mechanism, including a driving motor, a driving end of the driving motor is connected to a transmission shaft, an end of the transmission shaft facing away from the driving motor is installed with an end cover, the edge of the end cover is rotatably connected to a connecting arm, the bottom end of the connecting arm is rotatably connected to a lifting seat, a presser foot connecting rod is installed inside the lifting seat, and the bottom end of the presser foot connecting rod is connected to the presser foot.

[0005] Furthermore, the driving end of the driving motor and the transmission shaft are connected and fixed via a coupling.

[0006] Furthermore, a protrusion is integrally connected to the edge of the end cover, and the protrusion is rotatably connected to the top end of the connecting arm.

[0007] Furthermore, when the driving motor drives the end cover to rotate, the connecting arm, the lifting seat, the presser foot connecting rod and the presser foot as a whole always remain in a vertical state.

[0008] Furthermore, the rotation connection points between the protrusion and the connecting arm, and the rotation connection points between the connecting arm and the lifting seat are all connected by bolts. After the bolts are connected, the protrusion and the connecting arm, and the connecting arm and the lifting seat can still rotate relative to each other.

[0009] Furthermore, through holes are reserved at both ends of the connecting arm, and bearings are installed inside the through holes. After the bolts pass through the bearings, they are correspondingly threadedly connected to the raised portion and the lifting seat.

[0010] The utility model provides a sewing machine presser foot mechanism. Compared with the prior art, it has the following beneficial effects:

[0011] This sewing machine's presser foot mechanism uses a motor-driven drive shaft to rotate, which in turn drives the connecting arm, lift base, presser foot connecting rod, and the entire presser foot's movement. This design not only enables automated adjustment of the presser foot's height, but also, through precise assembly and connection, ensures stability and accuracy during the presser foot's raising and lowering process. Specifically, the circular motion of the connecting arm allows for flexible adjustment between 0 and 0.5 degrees, significantly improving adjustment precision and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of the utility model from the first perspective;

[0013] Figure 2 This is a schematic structural diagram of the utility model from a second viewing angle;

[0014] Figure 3 This is a schematic diagram of the height difference between the presser foot in the lowest position and the highest position in the present invention.

[0015] In the figure: 1. driving motor; 2. transmission shaft; 3. end cover; 31. raised portion; 4. connecting arm; 5. lifting seat; 6. presser foot connecting rod; 7. presser foot; 8. coupling. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] See also Figure 1-3 The utility model provides a technical solution: a sewing machine presser foot mechanism, mainly including a driving motor 1, a transmission shaft 2, an end cover 3, a connecting arm 4, a lifting seat 5, a presser foot connecting rod 6 and a presser foot 7 and other key components. These components are precisely assembled and connected to form an efficient and stable presser foot driving system. Among them, the driving end of the driving motor 1 is connected and fixed to the transmission shaft 2 through a coupling 8. This connection method ensures that the power output by the motor can be stably and efficiently transmitted to the transmission shaft 2, thereby driving the movement of the entire presser foot mechanism, and is convenient for disassembly and assembly.

[0018] An end cover 3 is installed at the end of the transmission shaft 2 facing away from the drive motor 1. The end cover 3 is fixed to the transmission shaft 2 by an appropriate fastening method (such as bolt connection), ensuring its stability and reliability during movement. The edge of the end cover 3 is integrally connected with a protrusion 31, and the protrusion 31 is connected to the top of the connecting arm 4 by a rotational connection. This connection method allows the connecting arm 4 to rotate under the drive of the end cover 3, and the bottom end of the connecting arm 4 is connected to the lifting seat 5 by a rotational connection. In this way, when the connecting arm 4 rotates, it can drive the lifting seat 5 to move up and down. A presser foot connecting rod 6 is installed inside the lifting seat 5, and the bottom end of the presser foot connecting rod 6 is connected to the presser foot 7. As the lifting seat 5 moves up and down, the presser foot connecting rod 6 and the presser foot 7 will also move up and down accordingly, thereby achieving the compression and release of the sewing material;

[0019] While the drive motor 1 rotates the end cap 3, the connecting arm 4, lifting base 5, presser foot connecting rod 6, and presser foot 7 remain vertical (due to gravity). This design ensures the stability and accuracy of the presser foot during the lifting process, avoiding sewing quality issues caused by deviation in the motion trajectory.

[0020] The pivoting connection points between the raised portion 31 and the connecting arm 4, as well as the pivoting connection points between the connecting arm 4 and the lifting seat 5, are both bolted. This connection not only ensures a secure connection but also allows relative rotation between the raised portion 31 and the connecting arm 4, and between the connecting arm 4 and the lifting seat 5. To further enhance the flexibility and stability of the connection, through-holes are provided at both ends of the connecting arm 4, with bearings installed within the through-holes. Bolts pass through the bearings and then threadably connect to the raised portion 31 and the lifting seat 5. This design effectively reduces friction and wear during rotation, improving the durability and reliability of the entire presser foot mechanism.

[0021] When the mechanism is working, the driving motor 1 drives the transmission shaft 2 to rotate through the coupling 8, and the transmission shaft 2 drives the end cover 3 and the protrusion 31 to rotate synchronously. Since the protrusion 31 is connected to the connecting arm 4 in a rotating manner, when the protrusion 31 rotates, the connecting arm 4 as a whole rotates in a circular motion with the middle part of the end cover 3 as the rotation center. During the motion, the connecting arm 4 will drive the lifting seat 5, the presser foot connecting rod 6 and the presser foot 7 to rise and fall synchronously. When the connecting arm 4 is at the lowest point during the circular motion, the presser foot 7 is also at the lowest point (as shown in the attached figure). Figure 3 Similarly, when the connecting arm 4 is at the highest point while performing circular motion, the presser foot 7 is also at the highest point (as shown in FIG. Figure 3 As shown in Figure b), the height difference between the presser foot 7 is D, that is, the height of the presser foot 7 can be adjusted freely between 0-D.

Claims

1. A sewing machine presser foot mechanism, comprising a drive motor (1), characterized in that: The driving end of the driving motor (1) is connected to a transmission shaft (2), an end of the transmission shaft (2) facing away from the driving motor (1) is installed with an end cover (3), the edge of the end cover (3) is rotatably connected to a connecting arm (4), the bottom end of the connecting arm (4) is rotatably connected to a lifting seat (5), a presser foot connecting rod (6) is installed inside the lifting seat (5), and the bottom end of the presser foot connecting rod (6) is connected to a presser foot (7).

2. A sewing machine presser foot mechanism according to claim 1, characterized in that: The driving end of the driving motor (1) and the transmission shaft (2) are connected and fixed via a coupling (8).

3. A sewing machine presser foot mechanism according to claim 1, characterized in that: A raised portion (31) is integrally connected to the edge of the end cover (3), and the raised portion (31) is rotatably connected to the top end of the connecting arm (4).

4. A sewing machine presser foot mechanism according to claim 1, characterized in that: During the process of the drive motor (1) driving the end cover (3) to rotate, the entirety of the connecting arm (4), the lifting seat (5), the presser foot connecting rod (6), and the presser foot (7) always remains in a vertical state.

5. The presser foot mechanism of a sewing machine according to claim 3, characterized in that: The rotational connection points between the protrusion (31) and the connecting arm (4) and the rotational connection points between the connecting arm (4) and the lifting seat (5) are both connected by bolts. After the bolt connection, the protrusion (31) and the connecting arm (4) and the connecting arm (4) and the lifting seat (5) can still rotate relative to each other.

6. A sewing machine presser foot mechanism according to claim 5, characterized in that: Through holes are reserved at both ends of the connecting arm (4), and bearings are installed inside the through holes. After the bolts pass through the bearings, they are threadedly connected to the raised portion (31) and the lifting seat (5).

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