Feed dog adjusting device for a sewing machine
By introducing a drive motor and transmission components into the sewing machine, the feed dog adjustment device is simplified, solving the problems of complex structure and poor stability of existing sewing machines. This achieves automatic adjustment and low noise, adapting to the needs of different machine housing spaces.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAIZHOU SNOKE ELECTRONICS SCI & TECH
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-24
AI Technical Summary
Existing sewing machines have complex differential feeding adjustment mechanisms, high production costs, poor stability, and are prone to stopping and jamming, resulting in high noise levels.
The drive motor drives the adjustment component through the transmission component to realize the automatic adjustment of the feed dog, simplifying the angle adjustment of the differential feed shaft's forward and reverse swing. It uses a slider groove or worm gear transmission, has a compact structure, and can adapt to different machine housing spaces.
It achieves automatic adjustment of the feed dog, has a simple structure, high stability, is not easy to jam, reduces production costs, has smooth transmission, and has a wide range of applications.
Smart Images
Figure CN224548696U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of sewing machine technology and relates to a feed dog adjustment device for a sewing machine. Background Technology
[0002] Existing differential feed adjustment mechanisms in sewing machines are often quite complex. For example, a differential feed computerized flatbed sewing machine described in Chinese Patent No. 201710441899.4 has a specific structure including a machine body, a lower differential feed shaft, a feed shaft, a tooth lifting shaft, and a lower differential feed mechanism. The feed shaft is sleeved outside the lower differential feed shaft, and both ends of the lower differential feed shaft are rotatably positioned on the machine body. The lower differential feed mechanism includes a feed crank, a lower differential adjustment crank, a feed adjustment crank, a conversion crank, a first transmission connecting rod, a second transmission connecting rod, and a third transmission connecting rod. The connecting rod and feed crank are rotatably sleeved on the lower differential feed shaft. The lower differential adjusting crank is fixed to the lower differential feed shaft. The feed adjusting crank is fixed to the feed shaft. The shifting crank is rotatably sleeved on the lifting shaft. The handle of the lower differential adjusting crank is rectangular. One end of the third transmission connecting rod is hinged to a kit, which slides into the rectangular sleeve of the lower differential adjusting crank. The other end of the third transmission connecting rod is movably hinged to the crank end of the shifting crank. This crank end is also movably hinged to one end of the first and second transmission connecting rods. The other end of the first transmission connecting rod is movably hinged to the feed adjusting crank. The crank, the other end of the second transmission connecting rod is movably hinged to the crank end of the feeding crank; the lower differential feeding mechanism includes a lower differential manual adjustment part, which includes a manual wrench, a spring plate, a limit seat, an upper limit component, a lower limit component, a limit plate, a crank shaft, and an adjusting connecting rod. The fixed surface on one side of the manual wrench is fixedly connected to the spring plate, and one end of the spring plate is elastically raised relative to the fixed surface. The fixed surface of the manual wrench is fixedly connected to one end of the crank shaft, and the crank shaft is rotatably positioned in the machine body. The crank end of the crank shaft is movably hinged to one end of the adjusting connecting rod. A connecting rod pin connects to a tension spring for crankshaft reset rotation, and the tension spring is fixedly connected to the machine body; the other end of the adjusting connecting rod is hinged to the third transmission rod; a limiting seat is fixed to the machine body, and the limiting seat has a vertical strip-shaped slot, in which an upper limiting component and a lower limiting component are fixedly connected, limiting the swing angle of the manual wrench; the lower limiting component is fixedly connected to the limiting seat and a limiting plate, and the limiting plate has a stop groove on the side facing the spring plate, and the spring plate has a locking block that elastically locks with the stop groove after the manual wrench swings.
[0003] In the above structure, the differential manual adjustment structure is complex and has a high production cost; the stability of the assembly of various components and the power transmission structure is poor, and it is easy to cause stoppage and jamming. When the whole is running, the noise is relatively large. Summary of the Invention
[0004] The purpose of this invention is to address the aforementioned problems in the prior art by providing an automatically adjustable feed dog adjustment device for a sewing machine.
[0005] The objective of this utility model can be achieved through the following technical solution: a feed dog adjustment device for a sewing machine, comprising a drive motor, a transmission assembly, and an adjustment assembly, wherein the drive motor drives the adjustment assembly to swing through the transmission assembly, and the adjustment assembly is used to adjust the angle of the differential feed shaft's forward and reverse swing.
[0006] In the above-mentioned feed dog adjustment device of the sewing machine, the adjustment assembly includes an adjustment seat, an adjustment shaft is fixed to the side of the adjustment seat, the adjustment seat is hinged to the machine housing through the adjustment shaft, the drive motor is connected to the adjustment seat through the transmission assembly and drives the adjustment seat to rotate, the adjustment seat is provided with an adjustment groove, the adjustment assembly also includes two first swing plates, two second swing plates, an adjustment link and a transmission link, one end of the two first swing plates is respectively hinged to the ends of the two groove walls of the adjustment groove, the other end of the two first swing plates is respectively hinged to the ends of the two second swing plates, the other end of the two second swing plates is hinged to the adjustment link, the adjustment link is fixedly connected to the differential feed shaft, one end of the transmission link is hinged to the eccentric wheel fixed to the main shaft, and the other end of the transmission link is coaxially hinged to the first swing plate and the second swing plate.
[0007] In the above-mentioned feed dog adjustment device of the sewing machine, the transmission component includes a slider and a groove located on the side of the adjustment seat. The slider is fixed on the output shaft of the drive motor. The adjustment shaft is arranged parallel to the output shaft of the drive motor. The slider is slidably disposed in the groove. The drive motor drives the slider to rotate, and the slider drives the adjustment seat to swing.
[0008] In the feed dog adjustment device of the sewing machine described above, the transmission assembly includes a worm gear and a worm that mesh with each other. The worm is hinged inside the machine housing. The drive motor is vertically arranged. The worm gear is connected to the output shaft of the drive motor. The end of the worm is fixed to the side of the adjustment seat. The adjustment shaft is parallel to the worm and perpendicular to the output shaft of the drive motor. The drive motor drives the worm gear to rotate, and the worm gear drives the worm to rotate, causing the adjustment seat to swing.
[0009] In the feed dog adjustment device of the sewing machine described above, a fixing block is fixed inside the machine housing. The fixing block is divided into a first fixing part and a second fixing part by a partition plate. The drive motor is fixed on the first fixing part, and the end of the adjustment shaft is fixed on the side wall of the second fixing part.
[0010] Compared with existing technologies, the feed dog adjustment device of this sewing machine achieves automatic feed dog adjustment through a drive motor. Its structure is reasonable and simple, simplifying the transmission and adjustment components for adjusting the angle of the differential feed shaft's forward and reverse rotation. This results in high structural stability, reduced likelihood of jamming or stalling, lower manufacturing costs, and ease of use. The transmission components allow for flexible placement of the drive motor based on the available space within the machine casing. Both slider / groove transmission and worm gear transmission can be selected. The compact structure is suitable for space-constrained sewing machine casings, offering wide applicability and consistent stability. Attached Figure Description
[0011] Figure 1 This is a three-dimensional structural schematic diagram of the feed dog adjustment device of this sewing machine according to Embodiment 1.
[0012] Figure 2 This is a three-dimensional structural diagram of part of the feed dog adjustment device in Embodiment 1 of this sewing machine.
[0013] Figure 3 This is a three-dimensional structural schematic diagram of Embodiment 2 of the feed dog adjustment device of this sewing machine.
[0014] Figure 4 This is a three-dimensional structural diagram of part of the feed dog adjustment device in Embodiment 2 of this sewing machine.
[0015] In the diagram, 1 is the drive motor; 2 is the adjustment assembly; 21 is the adjustment seat; 22 is the adjustment shaft; 23 is the first swing plate; 24 is the second swing plate; 25 is the adjustment link; 26 is the transmission link; 27 is the adjustment groove; 3 is the differential feeding shaft; 4 is the main shaft; 41 is the eccentric wheel; 5 is the slider; 6 is the fixed block; 61 is the partition plate; 7 is the worm gear; and 8 is the worm. Detailed Implementation
[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1
[0017] like Figure 1 and Figure 2 As shown, the feed dog adjustment device of this sewing machine includes a drive motor 1, a transmission assembly and an adjustment assembly 2. The drive motor 1 drives the adjustment assembly 2 to swing through the transmission assembly. The adjustment assembly 2 is used to adjust the angle of the differential feed shaft 3 in the forward and reverse swing.
[0018] In the above technical solution: the adjustment assembly 2 includes an adjustment seat 21, an adjustment shaft 22 is fixed to the side of the adjustment seat 21, the adjustment seat 21 is hinged to the machine housing via the adjustment shaft 22, and the drive motor 1 is connected to the adjustment seat 21 via a transmission assembly and drives the adjustment seat 21 to rotate. The adjustment seat 21 is provided with an adjustment groove 27. The adjustment assembly 2 also includes two first swing plates 23, two second swing plates 24, an adjustment connecting rod 25, and a transmission connecting rod 26. One end of each of the two first swing plates 23 is hinged to the ends of the two groove walls of the adjustment groove 27, and the other end of each of the two first swing plates 23 is hinged to the ends of the two second swing plates 24. The other ends of each of the two second swing plates 24 are hinged to the adjustment connecting rod 25, and the adjustment connecting rod 25 is fixedly connected to the differential feeding shaft 3. One end of the transmission connecting rod 26 is hinged to the eccentric wheel 41 fixed to the main shaft 4, and the other end of the transmission connecting rod 26 is coaxially hinged to both the first swing plates 23 and the second swing plates 24.
[0019] When the main shaft 4 rotates one revolution, the eccentric wheel 41 drives the transmission link 26 to swing. The transmission link 26 transmits the swing to the first swing plate 23, the second swing plate 24, and the adjusting link 25, causing the differential feeding shaft 3 to swing and achieve differential feeding. The drive motor 1 is connected to the adjusting seat 21 through the transmission assembly and drives the adjusting seat 21 to rotate. The rotation of the adjusting seat 21 changes the relative connection angle of the first swing plate 23 and the two second swing plates 24, and also changes the angle at which the transmission link 26 drives the first swing plate 23 and the second swing plate 24 to swing. Thus, the adjusting link 25 drives the differential feeding shaft 3 to change its swing amplitude, thereby achieving differential adjustment.
[0020] In the above technical solution: the transmission assembly includes a slider 5 and a slide groove 211 located on the side of the adjusting seat 21. The slider 5 is fixed on the output shaft of the drive motor 1, and the adjusting shaft 22 is arranged parallel to the output shaft of the drive motor 1. The slider 5 is slidably disposed within the slide groove 211. The drive motor 1 drives the slider 5 to rotate, and the slider 5 drives the adjusting seat 21 to swing. The slider 5 can slide up and down within the slide groove 211, ensuring smooth transmission between the slider 5 and the adjusting seat 21 and preventing transmission jamming.
[0021] In the above technical solution: a fixing block 6 is fixed inside the housing, and the fixing block 6 is divided into a first fixing part and a second fixing part by a partition plate 61. The drive motor 1 is fixed on the first fixing part, and the end of the adjusting shaft 22 is fixed on the side wall of the second fixing part. Example 2
[0022] This embodiment is largely similar to the previous embodiment in terms of technical solution. The differences will be described in detail, while the contents that are the same in both will not be repeated here.
[0023] In this embodiment, as Figure 3 , 4As shown, the transmission assembly includes a meshing worm gear 7 and a worm 8. The worm 8 is hinged inside the machine housing, and the worm 8 is laterally hinged to the side wall of the first fixed part of the fixed block 6. The drive motor 1 is vertically mounted on the first fixed part, and the worm gear 7 is connected to the output shaft of the drive motor 1. The end of the worm 8 is fixed to the side of the adjusting seat 21, and the adjusting shaft 22 is parallel to the worm 8 and perpendicular to the output shaft of the drive motor 1. The drive motor 1 drives the worm gear 7 to rotate, and the worm gear 7 drives the worm 8 to rotate, causing the adjusting seat 21 to swing. Through the transmission of the worm gear 7 and the worm 8, the drive motor 1 is vertically placed, resulting in a compact structure suitable for sewing machine housings with limited space. This allows for a reasonable arrangement of the installation position of the drive motor 1 according to the size of the space inside the housing. At the same time, the transmission of the worm gear 7 and the worm 8 is smooth, with low vibration and noise.
[0024] The feed dog adjustment device of this sewing machine achieves automatic feed dog adjustment through drive motor 1. The structure is reasonable and simple, and the transmission and adjustment components for adjusting the angle of the differential feed shaft's forward and reverse swing are simplified. The structure has high stability, is not easy to stop or jam, has low manufacturing cost, and is easy to use. The transmission component allows the installation position of drive motor 1 to be reasonably arranged according to the space inside the machine housing. It can choose slider 3 and groove 211 transmission or worm gear 7 and worm 8 transmission. The structure is compact, suitable for sewing machine housings with limited space, has a wide range of applications, and is traditionally stable.
[0025] 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.
[0026] Although this document frequently uses terms such as drive motor 1; adjusting assembly 2; adjusting seat 21; slide 211; adjusting shaft 22; first swing plate 23; second swing plate 24; adjusting connecting rod 25; transmission connecting rod 26; adjusting groove 27; differential feeding shaft 3; main shaft 4; eccentric wheel 41; slider 5; fixed block 6; partition plate 61; worm gear 7; worm 8, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.
[0027] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention 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 invention or exceeding the scope defined by the appended claims.
Claims
1. A feed dog adjustment device for a sewing machine, characterized in that... It includes a drive motor (1), a transmission assembly and an adjustment assembly (2). The drive motor (1) drives the adjustment assembly (2) to swing through the transmission assembly. The adjustment assembly (2) is used to adjust the angle of the differential feeding shaft (3) to swing forward and backward. The adjustment assembly (2) includes an adjustment seat (21), an adjustment shaft (22) is fixed to the side of the adjustment seat (21), the adjustment seat (21) is hinged to the housing through the adjustment shaft (22), the drive motor (1) is connected to the adjustment seat (21) through the transmission assembly and drives the adjustment seat (21) to rotate, the adjustment seat (21) is provided with an adjustment groove (27), the adjustment assembly (2) also includes two first swing plates (23), two second swing plates (24), an adjustment link (25) and a transmission link (26), the two first swing plates (23) One end of the first swing plate (23) is hinged to the ends of the two walls of the adjustment groove (27), and the other ends of the two first swing plates (23) are hinged to the ends of the two second swing plates (24). The other ends of the two second swing plates (24) are hinged to the adjustment link (25). The adjustment link (25) is fixedly connected to the differential feeding shaft (3). One end of the transmission link (26) is hinged to the eccentric wheel (41) fixed on the main shaft (4). The other end of the transmission link (26) is coaxially hinged to the first swing plate (23) and the second swing plate (24).
2. The feed dog adjustment device for a sewing machine according to claim 1, characterized in that... The transmission assembly includes a slider (5) and a groove (211) located on the side of the adjustment seat (21). The slider (5) is fixed on the output shaft of the drive motor (1). The adjustment shaft (22) is set parallel to the output shaft of the drive motor (1). The slider (5) is slidably disposed in the groove (211). The drive motor (1) drives the slider (5) to rotate. The slider (5) drives the adjustment seat (21) to swing.
3. The feed dog adjustment device for a sewing machine according to claim 1, characterized in that... The transmission assembly includes a worm gear (7) and a worm (8) that mesh with each other. The worm (8) is hinged inside the housing. The drive motor (1) is vertically arranged. The worm gear (7) is connected to the output shaft of the drive motor (1). The end of the worm (8) is fixed to the side of the adjustment seat (21). The adjustment shaft (22) is parallel to the worm (8) and perpendicular to the output shaft of the drive motor (1). The drive motor (1) drives the worm gear (7) to rotate, and the worm gear (7) drives the worm (8) to rotate, causing the adjustment seat (21) to swing.
4. The feed dog adjustment device for a sewing machine according to claim 1, characterized in that... A fixing block (6) is fixed inside the housing. The fixing block (6) is divided into a first fixing part and a second fixing part by a partition plate (61). The drive motor (1) is fixed on the first fixing part, and the end of the adjusting shaft (22) is fixed on the side wall of the second fixing part.