Novel presser foot lifting and stitch length adjusting mechanism for lockstitch sewing machine
By introducing a presser foot drive cam and a stepper motor into the sewing machine, the problems of high noise, severe vibration, and complex structure of the existing presser foot and stitch length adjustment mechanism in sewing machines are solved, achieving a presser foot and stitch length adjustment effect with low noise, simple structure, and low cost.
Patent Information
- Application Number
- CN202520119926.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-17
AI Technical Summary
Existing sewing machine presser foot and stitch length adjustment mechanisms suffer from problems such as high noise, severe vibration, complex structure, and high cost, and cannot achieve adjustable presser foot height.
The design combines a lifting foot drive cam and a stepper motor. By contacting the lifting foot drive cam with the pusher, the lifting foot crank is rotated, realizing automated control of the lifting foot and needle pitch adjustment. This simplifies the structure, reduces noise, and lowers costs.
It achieves low noise, simple structure, and low cost presser foot and stitch length adjustment, and is convenient to adjust through automatic control, thus improving the user experience of sewing machines.
Smart Images
Figure CN223738272U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of flat sewing machine, especially a novel presser foot lifting mechanism and stitch length adjusting mechanism for flat sewing machine. BACKGROUND
[0002] At present, the sewing machine needs to lift the presser foot and adjust the stitch length during use. In the existing structure, some will produce a large noise. For example, the stitch length adjusting mechanism of the ordinary sewing machine is mostly completed by a stitch length dial. During backstitching, a large impact force is generated, thereby causing noise and vibration of the whole machine, which cannot be avoided by the traditional structure. Some structures are separately controlled. For example, the ordinary presser foot lifting structure relies on an electromagnet for driving. In the working state, the electromagnet is pushed to the bottom, and the height of the presser foot reaches the highest. The height of the presser foot cannot be adjusted. At the same time, the electromagnet generates a large impact in the high attraction state, which has a large negative effect on the noise and vibration of the whole machine. At the same time, the presser foot lifting system of the ordinary sewing machine adopts an electromagnet system, so that the overall mechanism has a very large volume, the overall functional structure is complex, the cost is high, and the upgrading and modification space of the sewing machine is hindered. Therefore, the above structure needs to be further improved. SUMMARY
[0003] The utility model aims at providing a novel presser foot lifting mechanism and stitch length adjusting mechanism for flat sewing machine, which solves the problem of complex structure by lifting the presser foot driving cam.
[0004] The utility model is realized as follows: a novel presser foot lifting mechanism and stitch length adjusting mechanism for flat sewing machine, which comprises a machine body, a stepping motor is installed on the side surface of the machine body, a swing seat, a presser foot lever and a presser foot transmission shaft are respectively rotatably arranged in the machine body, a presser foot driving cam and a stitch length adjusting crank are respectively installed on the output shaft of the stepping motor, a stitch length adjusting connecting rod is connected to the eccentric part of the stitch length adjusting crank, the other end of the stitch length adjusting connecting rod is connected to the swing seat, a presser foot crank one is installed at one end of the presser foot transmission shaft, a presser foot connecting rod is connected to the other end of the presser foot crank one, the other end of the presser foot connecting rod is connected to the upper end of the presser foot lever, a presser foot crank two is installed at the other end of the presser foot transmission shaft, a pushing part for the presser foot driving cam to push is formed at the other end of the presser foot crank two.
[0005] Preferably, one end of the presser foot crank two is formed with a sleeve part two, an elastic adjusting part two is arranged on one side of the sleeve part two, and a fastener two is arranged in the elastic adjusting part two.
[0006] Preferably, one end of the presser foot crank one is formed with a sleeve part one, an elastic adjusting part one is arranged on one side of the sleeve part one, and a fastener one is arranged in the elastic adjusting part one.
[0007] Preferably, strip-shaped anti-skid parts are respectively formed on the outer peripheries of the two ends of the presser foot transmission shaft.
[0008] Preferably, the lower end of the presser foot lifting lever is connected with a pull rod, and the other end of the pull rod is connected with a presser foot assembly.
[0009] Preferably, the upper end of the presser foot lifting lever is further connected with a foot control lever, and the lower end of the foot control lever is connected with a knee rest assembly.
[0010] Compared with the prior art, the present application has the following prominent and beneficial technical effects:
[0011] The present application has the following prominent and beneficial technical effects: BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 The present application has the following prominent and beneficial technical effects:
[0013] Figure 2 The present application has the following prominent and beneficial technical effects: Figure One .
[0014] Figure 3 The present application has the following prominent and beneficial technical effects: Figure Two .
[0015] Figure 4 The present application has the following prominent and beneficial technical effects:
[0016] The present application has the following prominent and beneficial technical effects: DETAILED DESCRIPTION
[0017] The present application has the following prominent and beneficial technical effects:
[0018] As Figures 1-4The utility model discloses a novel presser foot lifting, stitch length adjusting mechanism for flat bed sewing machine, including the body 1, the side of body 1 is equipped with stepper motor 2, the swing seat 3, presser foot lever 4 and presser foot drive shaft 5 are rotatablely arranged in body 1 respectively, presser foot drive cam 6 and stitch length adjusting crank 7 are respectively installed on the output shaft 22 of stepper motor 2, and the eccentricity of stitch length adjusting crank 7 is connected with stitch length adjusting connecting rod 8, and the other end of stitch length adjusting connecting rod 8 is connected with swing seat 3, when stepper motor 2 operates, swing seat 2 can be driven to rotate through stitch length adjusting connecting rod 8, and the angle of swing seat 2 is adjusted, thereby the size of stitch length is adjusted, one end of presser foot drive shaft 5 is equipped with presser foot crank one 9, the other end of presser foot crank one 9 is connected with presser foot connecting rod 10, and the other end of presser foot connecting rod 10 is connected with the upper end of presser foot lever 4, the other end of presser foot crank two 11 is formed with the push part 12 for presser foot drive cam 6 to push, which is installed on the other end of presser foot drive shaft 5.
[0019] The utility model discloses a novel presser foot lifting, stitch length adjusting mechanism for flat bed sewing machine, including the body 1, the side of body 1 is equipped with stepper motor 2, the swing seat 3, presser foot lever 4 and presser foot drive shaft 5 are rotatablely arranged in body 1 respectively, presser foot drive cam 6 and stitch length adjusting crank 7 are respectively installed on the output shaft 22 of stepper motor 2, and the eccentricity of stitch length adjusting crank 7 is connected with stitch length adjusting connecting rod 8, and the other end of stitch length adjusting connecting rod 8 is connected with swing seat 3, when stepper motor 2 operates, swing seat 2 can be driven to rotate through stitch length adjusting connecting rod 8, and the angle of swing seat 2 is adjusted, thereby the size of stitch length is adjusted, one end of presser foot drive shaft 5 is equipped with presser foot crank one 9, the other end of presser foot crank one 9 is connected with presser foot connecting rod 10, and the other end of presser foot connecting rod 10 is connected with the upper end of presser foot lever 4, the other end of presser foot crank two 11 is formed with the push part 12 for presser foot drive cam 6 to push, which is installed on the other end of presser foot drive shaft 5.
[0020] One end of presser foot crank two 11 is formed with sleeve part two 13, one side of sleeve part two 13 is equipped with elastic adjusting part two 14, and fastener two 15 is arranged in elastic adjusting part two 14, so that detachable connection between presser foot crank two 11 and presser foot drive shaft 5 is realized, so as to adjust the installation position conveniently.
[0021] One end of presser foot crank one 9 is formed with sleeve part one 16, one side of sleeve part one 16 is equipped with elastic adjusting part one 17, and fastener one 18 is arranged in elastic adjusting part one 17, so that detachable connection between presser foot crank one 9 and presser foot drive shaft 5 is realized, so as to adjust the installation position conveniently.
[0022] The outer periphery of both ends of presser foot drive shaft 5 is formed with strip-shaped antiskid part 19 respectively, can increase the friction of sleeve part and presser foot drive shaft 5 connection place, prevents skidding, and transmission is stable and reliable.
[0023] The lower end of presser foot lever 4 is connected with pull rod 20, and the other end of pull rod 20 is connected with presser foot assembly.
[0024] The upper end of the presser foot lever 4 is further connected with a foot control lever 21, and the lower end of the foot control lever 21 is connected with a knee rest assembly.
[0025] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.
Claims
1. A new presser foot, stitch length regulating mechanism for a lockstitch machine characterized in that, The utility model provides a needle foot lifting mechanism, including body (1), the side of body (1) is equipped with step motor (2), can rotate respectively in body (1) and is equipped with swing seat (3), lift pressure foot lever (4) and lift pressure foot drive shaft (5), the output shaft (22) of step motor (2) is equipped with lift pressure foot drive cam (6) and needle pitch adjusting crank (7) respectively, the eccentricity of needle pitch adjusting crank (7) is connected with needle pitch adjusting connecting rod (8), the other end of needle pitch adjusting connecting rod (8) is connected with swing seat (3), one end of lift pressure foot drive shaft (5) is equipped with lift pressure foot crank one (9), the other end of lift pressure foot crank one (9) is connected with lift pressure foot connecting rod (10), the other end of lift pressure foot connecting rod (10) is connected with the upper end of lift pressure foot lever (4), the other end of lift pressure foot drive shaft (5) is equipped with lift pressure foot crank two (11), and the other end of lift pressure foot crank two (11) is formed with the push part (12) of lift pressure foot drive cam (6) for pushing.
2. The new presser foot, stitch length regulating mechanism for lockstitch machine as claimed in claim 1 wherein: One end of lift pressure foot crank two (11) is formed with sleeve part two (13), one side of sleeve part two (13) is provided with elastic adjusting part two (14), and fastener two (15) is arranged in elastic adjusting part two (14).
3. The new presser foot, stitch length regulating mechanism for lockstitch machine as claimed in claim 1 or 2 wherein: One end of lift pressure foot crank one (9) is formed with sleeve part one (16), one side of sleeve part one (16) is provided with elastic adjusting part one (17), and fastener one (18) is arranged in elastic adjusting part one (17).
4. The new presser foot, stitch length regulating mechanism for lockstitch machine as claimed in claim 1, wherein: The outer periphery of both ends of lift pressure foot drive shaft (5) is formed with strip-shaped antiskid part (19) respectively.
5. The new presser foot, stitch length regulating mechanism for lockstitch machine as claimed in claim 1, wherein: The lower end of lift pressure foot lever (4) is connected with pull rod (20), and the other end of pull rod (20) is connected with pressure foot assembly.
6. The new presser foot, stitch length regulating mechanism for lockstitch machine as claimed in claim 5 wherein: The upper end of lift pressure foot lever (4) is also connected with foot control lever (21), and the lower end of foot control lever (21) is connected with knee leaning assembly. The upper end of lift pressure foot lever (4) is also connected with foot control lever (21), and the lower end of foot control lever (21) is connected with knee leaning assembly.