Cloth feeding mechanism of sewing machine
By designing a compact sewing machine fabric feeding mechanism, including a drive shaft, bracket plate and reverse-slit switching components, the existing sewing machines lack the reverse-slit function and complex structure, and the reverse-slit function and low-cost goals in small household sewing machines are achieved. , suitable for the compactness and low price requirements of small household sewing machines.
Patent Information
- Application Number
- CN202420638850.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-29
AI Technical Summary
Existing small household sewing machines lack the reverse seam function or are complex in structure and not compact, resulting in high prices and difficult to meet the needs of compactness, low price and reverse seam functions.
A sewing machine cloth feeding mechanism including a drive shaft, a bracket plate, a cloth feeding rack, a front and rear drive assembly, a lifting drive assembly and a reverse seam switching assembly are designed. The front and rear and rear of the cloth feeding rack are realized through the drive shaft to drive the cam and the swing rod. The lifting and lowering movement uses the lever and the slide block to achieve reverse joint switching, which is compact in structure and simple in operation.
It realizes a compact fabric feeding mechanism structure, suitable for small household sewing machines, reduces costs, and realizes the reverse seam function through simple operation, improving the applicability and reliability of the equipment.
Smart Images
Figure CN222205669U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewing machines, in particular to a cloth feeding mechanism of a sewing machine. Background Art
[0002] Household sewing machines occupy the market mainly with the advantages of being small and light. However, the current small household sewing machines do not have the function of reverse sewing, or the sewing machines with reverse sewing function are complicated in structure, cannot be truly compact, and are generally expensive. Summary of the invention
[0003] The technical problem to be solved by the utility model is to provide a cloth feeding mechanism for a sewing machine, which has a compact structure, a low price and a reverse stitching function and is suitable for application in small household sewing machines.
[0004] In order to solve the above technical problems, the technical solution of the utility model is: a cloth feeding mechanism of a sewing machine, comprising a transmission shaft, a bracket plate, a cloth feeding tooth frame, a front and rear driving assembly for driving the cloth feeding tooth frame to move forward and backward, a lifting driving assembly for driving the cloth feeding tooth frame to move up and down, and a reverse stitch switching assembly for realizing reverse stitch switching; the front and rear driving assembly comprises a driving plate arranged in parallel with the bracket plate, a swing rod pivotally connected to the bracket plate and a first cam sleeved on the transmission shaft, a first window is arranged on the driving plate, the first cam is arranged in the first window of the driving plate, a ring is arranged at one end of the driving plate, and a first convex column is arranged on the swing rod The ferrule is rotatably matched with the first protrusion, the lower end of the rocker arm is pivotally connected to the bracket plate through the first rotating shaft, and the upper end of the rocker arm is rotatably connected to the feed tooth frame through the second rotating shaft; the lifting drive mechanism includes a second window arranged on the feed tooth frame, a second cam and a crown gear sleeved on the transmission shaft, the second cam is arranged in the second window, and the second cam and the crown gear are integrally formed; the reverse stitch switching assembly includes a second protrusion arranged at the other end of the driving plate, a slide block pivotally connected to the bracket plate and having a slide groove, a driving shaft and a shift block driving the driving shaft, and one end of the driving shaft is connected to the slide block through gear meshing. The principle of the utility model is as follows: when it is necessary to realize the forward and backward movement of the cloth feeding tooth frame, the transmission shaft drives the first cam to rotate, the first cam cooperates with the driving plate, and the driving plate moves forward and backward through the forward and backward deflection of the first cam, and the driving plate drives the swing rod to swing forward and backward through the cooperation of the first convex column and the ring, and the swing rod drives the cloth feeding tooth frame to move forward and backward; when it is necessary to realize the up and down movement of the cloth feeding tooth frame, the transmission shaft drives the second cam to rotate, the second cam cooperates with the cloth feeding tooth frame, and the cloth feeding tooth frame is lifted and lowered through the up and down deflection of the second cam; that is, the driving mechanism drives the transmission shaft to rotate and drives the cloth feeding tooth frame to move forward and backward and lift and lower movements at the same time, so as to complete the forward and backward and lift and lower movements of the cloth feeding teeth during sewing; when reverse sewing is required, the driving shaft is driven to rotate by shifting the shifting block, and the driving shaft drives the slide block to change from tilting forward to tilting backward through the rotational movement, and because the driving plate cooperates with the slide block through the second convex column, the driving plate changes from moving forward to moving backward, so as to achieve the effect of directional cloth feeding, i.e. reverse sewing.
[0005] As an improvement, the first cam includes a limiting plate integrally formed therewith, and the limiting plate abuts against one side of the bracket plate.
[0006] As an improvement, the bracket plate is provided with an arc-shaped through hole, and the second rotating shaft passes through the arc-shaped through hole and is connected to the feed tooth frame.
[0007] As an improvement, an L-shaped limit block is provided on the bracket plate, a limit groove is formed in the L-shaped limit block, and the upper end of the feed tooth frame is arranged in the limit groove.
[0008] As an improvement, a torsion spring is provided between the slide block and the bracket plate, a first gear is provided on one side of the slide block, a second gear is provided at one end of the drive shaft, and the first gear is meshed with the second gear.
[0009] As an improvement, a rack is provided on the shift block, a third gear is provided on the drive shaft, and the rack is meshed with the third gear.
[0010] As an improvement, the second window is rectangular, and a bending plate integrally formed with the cloth feeding tooth frame is provided on the top and bottom of the second window.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] The second cam of the utility model is integrally formed with the crown gear, the crown gear can drive the shuttle disc to rotate, and the second cam cooperates with the feed tooth frame to make the feed tooth rise and fall. This structure is compact and can reduce the volume of the feed mechanism, making it suitable for use in small household sewing machines. The reverse stitching switching is achieved by the shifting block, the driving shaft and the slide block, which can be achieved by shifting the shifting block up and down, and the operation is simple. The driving shaft and the slide block are meshed by gears, and the slide block has good stability after the state is changed. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram I of the utility model.
[0014] Figure 2 This is schematic diagram II of the utility model.
[0015] Figure 3 This is an exploded view of the utility model. DETAILED DESCRIPTION
[0016] The utility model will be further described below in conjunction with the accompanying drawings.
[0017] like Figures 1 to 3 As shown, a cloth feeding mechanism of a sewing machine includes a transmission shaft 8, a bracket plate 13, a cloth feeding frame 7, a front and rear driving assembly for driving the cloth feeding frame 7 to move forward and backward, a lifting driving assembly for driving the cloth feeding frame 7 to move up and down, and a reverse stitch switching assembly for realizing reverse stitch switching; one end of the transmission shaft 8 is connected to the driving mechanism, and the other end of the transmission shaft 8 drives the shuttle disc 18 through the crown gear 20.
[0018] like Figures 1 to 3As shown, the front-rear driving assembly includes a driving plate 10 arranged parallel to the bracket plate 13, a swing rod 12 pivotally connected to the bracket plate 13, and a first cam 16 sleeved on the transmission shaft 8; the driving plate 10 is provided with a first window 17, the first window 17 is rectangular, the first cam 16 is arranged in the first window 17 of the driving plate 10, and the first cam 16 collides with the inner wall of the first window 17 through the rotation of the first cam 16, thereby driving the driving plate 10; the first cam 16 includes a limiting plate 9 integrally formed therewith, the limiting plate 9 is abutted against one side of the bracket plate 13, and the reliable cooperation between the first cam 16 and the driving plate 10 is ensured by the limit plate 9; a ring 11 is provided at one end of the driving plate 10, and a first boss 22 is provided on the rocker arm 12, and the first boss 22 is rotatably connected with the ring 11, and the lower end of the rocker arm 12 is pivotally connected to the bracket plate 13 through a first rotating shaft, and the upper end of the rocker arm 12 is rotatably connected to the feed tooth frame 7 through a second rotating shaft, and an arc through hole is provided on the bracket plate 13, and the second rotating shaft passes through the arc through hole and is connected to the feed tooth frame 7.
[0019] like Figures 1 to 3 As shown, the lifting drive mechanism includes a second window 20 arranged on the cloth feed tooth frame 7, a second cam 21 sleeved on the transmission shaft 8 and a crown gear 20; the second cam 21 is arranged in the second window 20, the second cam 21 and the crown gear 20 are integrally formed, the second window 20 is rectangular, and the upper and lower parts of the second window 20 are provided with a bending plate integrally formed with the cloth feed tooth frame 7, the second cam 21 acts on the bending plate of the second window 20, thereby increasing the contact area between the two and improving the reliability of the drive.
[0020] like Figures 1 to 3 As shown, the reverse stitch switching assembly includes a second boss 15 arranged at the other end of the driving plate 10, a slide block 6 pivotally connected to the bracket plate 13 and having a slide slot 14, a driving shaft 4 and a shift block 1 for driving the driving shaft 4; a torsion spring is arranged between the slide block 6 and the bracket plate 13, a first gear 23 is arranged on one side of the slide block 6, a second gear 5 is arranged at one end of the driving shaft 4, the first gear 23 is meshed with the second gear 5, and one end of the driving shaft 4 is connected to the slide block 6 through gear meshing; a rack 2 is arranged on the shift block 1, a third gear 3 is arranged on the driving shaft 4, the rack 2 is meshed with the third gear 3, and the up and down movement of the shift block 1 can drive the driving shaft 4 to rotate forward and reverse.
[0021] The bracket plate 13 is provided with an L-shaped limiting block, a limiting groove is formed in the L-shaped limiting block, and the upper end of the feed tooth frame 7 is arranged in the limiting groove.
[0022] The principle of the utility model is as follows: when it is necessary to realize the forward and backward movement of the cloth feeding tooth frame 7, the transmission shaft 8 drives the first cam 16 to rotate, the first cam 16 cooperates with the driving plate 10, and the driving plate 10 moves forward and backward through the forward and backward deflection of the first cam 16. The driving plate 10 drives the swing rod 12 to swing forward and backward through the cooperation of the first protrusion 22 and the ring 11, and the swing rod 12 drives the cloth feeding tooth frame 7 to move forward and backward; when it is necessary to realize the up and down movement of the cloth feeding tooth frame 7, the transmission shaft 8 drives the second cam 21 to rotate, the second cam 21 cooperates with the cloth feeding tooth frame 7, and the second cam 21 is driven by the second cam 21. The up and down deflection of the cam 21 causes the feed tooth frame 7 to rise and fall; that is, the driving mechanism drives the transmission shaft 8 to rotate while driving the feed tooth frame 7 to move forward and backward and up and down, completing the forward and backward and up and down movements of the feed tooth during sewing; when reverse sewing is required, the drive shaft 4 is driven to rotate by toggling the toggle block 1, and the drive shaft 4 drives the chute block 6 to change from tilting forward to tilting backward through the rotational movement. Since the drive plate 10 cooperates with the chute block 6 through the second protrusion 15, the drive plate 10 changes from moving forward to moving backward, thereby achieving the effect of directional feeding, that is, reverse sewing.
Claims
1. A cloth feeding mechanism for a sewing machine, comprising a transmission shaft, a support plate, a cloth feeding tooth frame, a front and rear driving assembly for driving the cloth feeding tooth frame to move forward and backward, a lifting driving assembly for driving the cloth feeding tooth frame to move upward and downward, and a reverse stitch switching assembly for realizing reverse stitch switching; characterized in that: The transmission gear of the present invention is a gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a first gear and a second gear selected from the group consisting of a 2. A cloth feeding mechanism for a sewing machine according to claim 1, characterized in that: The first cam includes a limiting plate integrally formed therewith, and the limiting plate abuts against one side of the bracket plate.
3. A cloth feeding mechanism for a sewing machine according to claim 1, characterized in that: The bracket plate is provided with an arc-shaped through hole, and the second rotating shaft passes through the arc-shaped through hole and is connected with the cloth feeding tooth frame.
4. A cloth feeding mechanism for a sewing machine according to claim 1, characterized in that: An L-shaped limiting block is arranged on the bracket plate, a limiting groove is formed in the L-shaped limiting block, and the upper end of the feed tooth frame is arranged in the limiting groove.
5. A cloth feeding mechanism for a sewing machine according to claim 1, characterized in that: A torsion spring is arranged between the slide block and the bracket plate, a first gear is arranged on one side of the slide block, a second gear is arranged at one end of the driving shaft, and the first gear is meshed with the second gear.
6. A cloth feeding mechanism for a sewing machine according to claim 1, characterized in that: The shift block is provided with a rack, the drive shaft is provided with a third gear, and the rack is meshed with the third gear.
7. A cloth feeding mechanism for a sewing machine according to claim 1, characterized in that: The second window is rectangular, and a bending plate integrally formed with the cloth feeding tooth frame is provided on the upper and lower sides of the second window.