Electric presser foot mechanism for sewing machine

Abstract

The utility model provides a kind of sewing machine electric lifting presser foot mechanism, belong to sewing machine technical field.It includes presser foot assembly and with the drive assembly of presser foot assembly through presser foot piece driving part connection, the drive assembly includes the electric drive of the driving shaft with the ability of output circumferential power, the vertical output shaft of being connected with the presser foot piece driving part far from presser foot assembly one end and the split cam structure of connecting the driving shaft and vertical output shaft.The utility model connects driving shaft and vertical output shaft by using split cam structure, optimizes the structural design of lifting presser foot mechanism, solves the problem of traditional cam structure assembly and disassembly difficulty, improves the assembly efficiency and maintenance convenience of mechanism.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to an electric presser foot lifting mechanism for sewing machines. Background Technology

[0002] In industries such as textiles, apparel, and home textiles, sewing machines and embroidery machines are core sewing equipment. The operating efficiency and ease of maintenance of their presser foot lifting mechanisms directly affect production rhythm and processing costs. The presser foot lifting mechanism of this type of equipment mainly consists of a drive component, a cam structure, and a transmission component. Its core function is to convert the power of the drive component into the vertical lifting action of the presser foot through the cam structure, so as to realize key operations such as fabric feeding and material changing. In existing technologies, cam structures generally adopt an "integrated cam + connecting rod" design, where the cam body and the transmission connecting rod are rigidly connected by welding, integral casting, or multiple sets of fastening bolts. This structure has obvious drawbacks in practical applications: Firstly, precise alignment of the transmission points of the cam and connecting rod is required during assembly, and the tightening of multiple sets of bolts is cumbersome, which not only increases the time and cost of production assembly but also easily leads to a decrease in the transmission accuracy of the cam and connecting rod due to assembly deviations, resulting in problems such as jamming of the presser foot lifting and delay in action. Secondly, when the cam or connecting rod suffers from wear, deformation, or other faults and needs to be repaired or replaced, due to the tight connection between the components, the external protective structure of the equipment must be disassembled first, and then multiple sets of fastening components must be disassembled one by one before the damaged cam or connecting rod can be separated. The repair process is time-consuming and seriously affects the normal production time of the equipment. Especially in mass production scenarios, frequent downtime for maintenance will directly reduce the overall production line capacity. Summary of the Invention

[0003] The purpose of this utility model is to address the above-mentioned problems by providing an electric presser foot lifting mechanism for sewing machines.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An electric presser foot lifting mechanism for a sewing machine includes a presser foot assembly and a drive assembly connected to the presser foot assembly via a presser foot transmission component. The drive assembly includes an electric drive component having a drive shaft capable of outputting circumferential power, a vertical output shaft connected to the end of the presser foot transmission component away from the presser foot assembly, and a split cam structure connecting the drive shaft and the vertical output shaft.

[0005] In the above-mentioned electric presser foot lifting mechanism of the sewing machine, the split cam structure includes a mating wheel rotatably disposed in a roller mounting groove at the upper end of the vertical output shaft and a drive wheel fixedly connected to the drive shaft. The mating wheel is located below the drive wheel, and the drive wheel is provided with a drive surface located on the side of the drive wheel facing the mating wheel.

[0006] In the above-mentioned electric presser foot lifting mechanism of the sewing machine, the outer end of the drive wheel is also provided with a resting surface, which is connected to the drive surface, and the radial distance between each position on the resting surface and the axis of the drive wheel is equal.

[0007] In the above-mentioned electric presser foot lifting mechanism of the sewing machine, the outer end of the drive wheel is also provided with a limiting part, which is connected to the rest surface away from the drive surface.

[0008] In the above-mentioned electric presser foot lifting mechanism of the sewing machine, the vertical output shaft includes an upper connecting part, a middle connecting part and a lower connecting part. The upper connecting part and the lower connecting part are respectively connected to the middle connecting part through adjusting screw sleeves. The mating wheel is set on the upper connecting part, and the lower connecting part is connected to the presser foot transmission component.

[0009] The above-mentioned electric presser foot lifting mechanism for sewing machines also includes an output shaft limiting block fixed on the frame, and the middle connecting part passes through the output shaft limiting block and slides in cooperation with the output shaft limiting block.

[0010] In the above-mentioned electric presser foot lifting mechanism of the sewing machine, the presser foot transmission component includes a first presser foot transmission plate, a swing arm, and a second presser foot transmission plate. The middle part of the first presser foot transmission plate is rotatably connected to a transmission plate connecting plate fixed on the frame via a rotating shaft. The outer end of the first presser foot transmission plate is fixedly connected to the bottom end of the vertical output shaft. The side of the first presser foot transmission plate away from the vertical output shaft is connected to a drive plate connected to the swing arm via a hook connector. The end of the swing arm away from the drive plate is connected to the inner end of the second presser foot transmission plate. The presser foot assembly is located at the outer end of the second presser foot transmission plate.

[0011] In the above-mentioned electric presser foot lifting mechanism of the sewing machine, a return torsion spring is provided at the inner end of the first presser foot transmission plate, and the return torsion spring connects the first presser foot transmission plate and the machine frame.

[0012] In the above-mentioned electric presser foot lifting mechanism of the sewing machine, a presser foot adjustment assembly is also connected to the upper side of the second presser foot transmission plate; The presser foot adjustment assembly includes a hollow tube connected to the frame. An adjustment shaft that is slidably connected to the lower part of the hollow tube and rotatably connected to the second presser foot transmission plate is provided. A rotating shaft is screwed to the upper part of the hollow tube. The rotating shaft and the hollow tube are screwed together. An adjustment spring is provided between the rotating shaft and the adjustment shaft. A limiting groove with a lower opening is also provided at the lower part of the hollow tube. An adjustment limiting rod that is inserted into the limiting groove is fixedly connected to the adjustment shaft.

[0013] In the above-mentioned electric presser foot lifting mechanism of the sewing machine, the presser foot assembly includes a presser foot and a guide plate disposed on the side of the presser foot.

[0014] Compared with existing technologies, the advantages of this utility model are: 1. This utility model optimizes the structural design of the lifting foot mechanism by adopting a split cam structure to connect the drive shaft and the vertical output shaft, solving the problem of difficult assembly and disassembly of traditional cam structures, and improving the assembly efficiency and maintenance convenience of the mechanism.

[0015] 2. The split cam structure consists of a rotating mating wheel and a drive wheel fixed to the drive shaft. The drive surface of the drive wheel cooperates with the mating wheel for transmission. This split design makes the installation and replacement of each component of the cam structure more convenient. At the same time, the precise contact between the drive surface and the mating wheel ensures the stability of power transmission and improves the reliability of the presser foot lifting action.

[0016] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the driver component; Figure 3 This is a structural diagram of the split cam structure; Figure 4 This is a structural schematic diagram of the pressure foot transmission component; Figure 5 This is a schematic diagram of the presser foot adjustment assembly. Detailed Implementation

[0018] like Figures 1-5 As shown, an electric presser foot lifting mechanism for a sewing machine includes a presser foot assembly 1 and a drive assembly 2 connected to the presser foot assembly 1 via a presser foot transmission component 101. The drive assembly 2 includes an electric drive component 202 having a drive shaft 201 capable of outputting circumferential power, a vertical output shaft 102 connected to the end of the presser foot transmission component 101 away from the presser foot assembly 1, and a split cam structure 3 connecting the drive shaft 201 and the vertical output shaft 102.

[0019] This invention optimizes the structural design of the pressure foot lifting mechanism by using a split cam structure to connect the drive shaft and the vertical output shaft, solving the problem of difficult assembly and disassembly of traditional cam structures, and improving the assembly efficiency and maintenance convenience of the mechanism.

[0020] In this embodiment, the electric drive component is a motor.

[0021] Specifically, the split cam structure 3 includes a mating wheel 301 rotatably mounted in a roller mounting groove at the upper end of the vertical output shaft 102 and a drive wheel 302 fixedly connected to the drive shaft 201. The mating wheel 301 is located below the drive wheel 302, and the drive wheel 302 is provided with a drive surface 303, which is located on the side of the drive wheel 302 facing the mating wheel 301. The split cam structure consists of a rotatably mounted mating wheel and a drive wheel fixedly connected to the drive shaft. The drive surface of the drive wheel engages with the mating wheel for transmission. This split design makes the installation and replacement of the various components of the cam structure more convenient. At the same time, the precise contact between the drive surface and the mating wheel ensures the stability of power transmission and improves the reliability of the presser foot lifting action.

[0022] Specifically, the outer end of the drive wheel 302 is also provided with a rest surface 304, which is connected to the drive surface 303. The radial distance between each position on the rest surface 304 and the axis of the drive wheel 302 is equal. The rest surface at the outer end of the drive wheel is connected to the drive surface, and the radial distance from each position on the rest surface to the axis of the drive wheel is equal. This design firstly enables the pressure foot lifting mechanism to maintain a stable state during a specific stroke, avoiding unnecessary fluctuations during operation, enhancing the smoothness of the mechanism's operation, and improving the consistency of the equipment's work.

[0023] Specifically, the outer end of the drive wheel 302 also has a protruding limiting part 305, which is connected to the side of the rest surface 304 away from the drive surface 303. The limiting part protruding from the outer end of the drive wheel and connected to the side of the rest surface away from the drive surface effectively limits the travel of the mating wheel, preventing excessive displacement of the mating wheel that could lead to mechanism failure. This improves the safety and reliability of the cam structure and extends the service life of the mechanism. Specifically, the vertical output shaft 102 includes an upper connecting part 103, a middle connecting part 104, and a lower connecting part 105. The upper connecting part 103 and the lower connecting part 105 are respectively connected to the middle connecting part 104 via adjusting screw sleeves 106. A mating wheel 301 is disposed on the upper connecting part 103, and the lower connecting part 105 is connected to the pressure foot transmission component 101. The upper and lower connecting parts of the vertical output shaft are respectively connected to the middle connecting part via adjusting screw sleeves, realizing the adjustable length of the vertical output shaft. This design allows the mating position of the mating wheel and the drive wheel to be flexibly adjusted to adapt to different working conditions, enhancing the versatility and adaptability of the mechanism. Secondly, it can reduce the replacement cost when the shaft is partially damaged.

[0024] Preferably, the device further includes an output shaft limiting block 107 fixed on the frame, and the intermediate connecting part 104 passes through the output shaft limiting block 107 and slides in cooperation with it. The output shaft limiting block guides and limits the intermediate connecting part, ensuring that the vertical output shaft maintains stable axial movement during operation, avoiding offset, ensuring the precision of the split cam structure, and improving the accuracy of the presser foot lifting action.

[0025] Specifically, the presser foot transmission component 101 includes a first presser foot transmission plate 108, a swing arm 109, and a second presser foot transmission plate 110. The middle part of the first presser foot transmission plate 108 is rotatably connected to the transmission plate connecting plate 111 fixed on the frame via a rotating shaft. The outer end of the first presser foot transmission plate 108 is fixedly connected to the bottom end of the vertical output shaft 102. The side of the first presser foot transmission plate 108 away from the vertical output shaft 102 is connected to the drive plate 113 connected to the swing arm 109 via a hook connector 112. The end of the swing arm 109 away from the drive plate 113 is connected to the inner end of the second presser foot transmission plate 110. The presser foot assembly 1 is disposed at the outer end of the second presser foot transmission plate 110. A return torsion spring 114 is disposed at the inner end of the first presser foot transmission plate 108. The return torsion spring 114 connects the first presser foot transmission plate 108 and the frame. The presser foot transmission component achieves power transmission through the cooperation of the first presser foot transmission plate 108, the swing arm 109, and the second presser foot transmission plate 110. This optimizes the force transmission path, enabling the power of the vertical output shaft to be efficiently transmitted to the presser foot assembly, improving the response speed and execution force of the presser foot lifting action, and ensuring the smoothness of the sewing operation of the equipment. The reset torsion spring at the inner end of the first presser foot transmission plate can drive the transmission plate to reset after the action is completed, ensuring that the presser foot assembly returns to the initial position in time, avoiding the trouble of manual reset, improving the automation level and work efficiency of the equipment, and reducing the number of operation steps. Specific process: When the driving surface of the drive wheel presses down on the mating wheel, the vertical output shaft descends, the inner end of the first pressure foot transmission plate rises, and the reset torsion spring is compressed and accumulates elastic potential energy. At this time, the hook connector 112 moves upward and drives the swing arm to rotate through the drive plate, so that the pressure foot assembly realizes the pressing action; conversely, when the drive wheel rotates away from the mating wheel, the reset torsion spring 114 applies a reverse force to the first pressure foot transmission plate, so that the vertical output shaft rises, and the pressure foot assembly completes the lifting action.

[0026] Specifically, a presser foot adjustment assembly is also connected to the upper side of the second presser foot transmission plate 110. The presser foot adjustment assembly includes a hollow tube 115 connected to the frame. An adjustment shaft 116, rotatably connected to the second presser foot transmission plate 110, is slidably mounted on the lower part of the hollow tube 115. A rotating shaft 117 is screwed to the upper part of the hollow tube 115. The rotating shaft 117 and the hollow tube 115 are screwed together. An adjustment spring 118 is provided between the rotating shaft 117 and the adjustment shaft 116. A limiting groove 119 with a downward opening is also provided at the lower part of the hollow tube 115. An adjusting limiting rod 120, inserted into the limiting groove 119, is fixedly connected to the adjustment shaft 116. Through the cooperation of the rotating shaft, the adjusting spring, and the adjusting shaft, the presser foot adjustment assembly can adjust the pressure and position of the presser foot assembly to adapt to the sewing needs of fabrics of different thicknesses. The cooperation of the limiting groove and the adjusting limiting rod ensures the stability of the adjustment process, improving the applicability of the equipment and the sewing quality.

[0027] Specifically, the presser foot assembly 1 includes a presser foot 121 and a guide plate 122 disposed on the side of the presser foot 121. The guide plate disposed on the side of the presser foot assembly can guide the sewing thread, prevent the thread from tangling or deviating, ensure the accuracy of the sewing path, improve the aesthetics and quality of sewing, and reduce rework caused by sewing problems.

[0028] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An electric presser foot lifting mechanism for a sewing machine, comprising a presser foot assembly (1) and a drive assembly (2) connected to the presser foot assembly (1) via a presser foot transmission component (101), characterized in that, The drive assembly (2) includes an electric drive unit (202) having a drive shaft (201) capable of outputting circumferential power, a vertical output shaft (102) connected to the end of the presser foot assembly (101) away from the presser foot assembly (1), and a split cam structure (3) connecting the drive shaft (201) and the vertical output shaft (102).

2. The electric presser foot lifting mechanism for a sewing machine according to claim 1, characterized in that, The split cam structure (3) includes a mating wheel (301) rotatably mounted in a roller mounting groove at the upper end of the vertical output shaft (102) and a drive wheel (302) fixedly connected to the drive shaft (201). The mating wheel (301) is located below the drive wheel (302), and the drive wheel (302) is provided with a drive surface (303) and the drive surface (303) is located on the side of the drive wheel (302) facing the mating wheel (301).

3. The electric presser foot lifting mechanism for a sewing machine according to claim 2, characterized in that, The outer end of the drive wheel (302) is also provided with a rest surface (304), which is connected to the drive surface (303). The radial distance between each position on the rest surface (304) and the axis of the drive wheel (302) is equal.

4. The electric presser foot lifting mechanism for a sewing machine according to claim 3, characterized in that, The outer end of the drive wheel (302) is also provided with a limiting part (305), which is connected to the side of the rest surface (304) away from the drive surface (303).

5. The electric presser foot lifting mechanism for a sewing machine according to any one of claims 2-4, characterized in that, The vertical output shaft (102) includes an upper connecting part (103), a middle connecting part (104) and a lower connecting part (105). The upper connecting part (103) and the lower connecting part (105) are connected to the middle connecting part (104) through adjusting screw sleeves (106). A mating wheel (301) is set on the upper connecting part (103). The lower connecting part (105) is connected to the pressure foot transmission component (101).

6. The electric presser foot lifting mechanism for a sewing machine according to claim 5, characterized in that, It also includes an output shaft limiting block (107) fixed on the frame, wherein the middle connecting part (104) passes through the output shaft limiting block (107) and slides in cooperation with the output shaft limiting block (107).

7. The electric presser foot lifting mechanism for a sewing machine according to any one of claims 1-4, characterized in that, The presser foot transmission component (101) includes a first presser foot transmission plate (108), a swing arm (109), and a second presser foot transmission plate (110). The middle part of the first presser foot transmission plate (108) is rotatably connected to the transmission plate connecting plate (111) fixed on the frame via a rotating shaft. The outer end of the first presser foot transmission plate (108) is fixedly connected to the bottom end of the vertical output shaft (102). The side of the first presser foot transmission plate (108) away from the vertical output shaft (102) is connected to the drive plate (113) connected to the swing arm (109) via a hook connector (112). The end of the swing arm (109) away from the drive plate (113) is connected to the inner end of the second presser foot transmission plate (110). The presser foot assembly (1) is located at the outer end of the second presser foot transmission plate (110).

8. The electric presser foot lifting mechanism for a sewing machine according to claim 7, characterized in that, The inner end of the first presser foot transmission plate (108) is provided with a reset torsion spring (114), which connects the first presser foot transmission plate (108) and the frame.

9. The electric presser foot lifting mechanism for a sewing machine according to claim 7, characterized in that, The upper side of the second presser foot transmission plate (110) is also connected to a presser foot adjustment assembly; The presser foot adjustment assembly includes a hollow tube (115) connected to the frame. The lower part of the hollow tube (115) is slidably provided with an adjustment shaft (116) that is rotatably connected to the second presser foot transmission plate (110). The upper part of the hollow tube (115) is screwed with a rotating shaft (117). The rotating shaft (117) and the hollow tube (115) are screwed together. An adjustment spring (118) is provided between the rotating shaft (117) and the adjustment shaft (116). The lower part of the hollow tube (115) is also provided with a limiting groove (119) with a lower opening. An adjustment limiting rod (120) that is inserted into the limiting groove (119) is fixedly connected to the adjustment shaft (116).

10. The electric presser foot lifting mechanism for a sewing machine according to any one of claims 1-4, characterized in that, The presser foot assembly (1) includes a presser foot (121) and a guide plate (122) disposed on the side of the presser foot (121).

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