Differential adjusting mechanism and sewing machine

Abstract

The utility model relates to a differential adjusting mechanism and a sewing machine, the sewing machine comprises a needle plate, a needle plate frame for supporting the needle plate, a differential feed dog and a differential adjusting mechanism, and the differential feed dog is assembled on a differential feed dog frame; the differential adjusting mechanism comprises a differential swing rod, a differential connecting rod and a crank arranged at one end of the differential swing rod. An adjusting groove is formed in the crank, the differential feed dog frame is arranged on one side of the differential connecting rod, the assembling position of one end of the differential connecting rod and the crank is adjusted through a screw and a fastener which are assembled in the adjusting groove, and the fastener and the differential feed dog frame are located on the same side of the differential connecting rod. And a screw rod penetrates through the differential connecting rod and is assembled with a fastener. According to the technical scheme, the fastener is arranged on the same side of the differential feed dog frame, and the screw rod is arranged on the other side away from the differential feed dog frame, so that a wider space is provided for operation when the differential ratio is adjusted or maintenance is carried out, the process time is shortened, meanwhile, operation is convenient, and efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of industrial sewing machines, and in particular to a differential adjustment mechanism and a sewing machine. Background Art

[0002] The actual stitch length of an industrial sewing machine during sewing is mainly determined by the movement of the feed dog and the differential dog, and the ratio of the movement distance of the differential dog and the feed dog, i.e. the differential ratio, can adjust the flatness of the fabric during sewing. Different processes and product patterns require different flatness of the sewn fabric. For example, some processes require the fabric to be flat, while some processes require the fabric to be wrinkled. This requires adjusting the movement of the feed dog and the differential dog in the sewing machine to obtain the required stitch length and flatness.

[0003] The feeding device of the existing equipment can adjust the differential ratio in multiple stages, which is usually achieved by adjusting a locking mechanism such as a nut. Given the small space in the head of the sewing machine, it takes a lot of time for users or maintenance technicians to adjust the differential ratio.

[0004] Based on this, it is necessary to provide a differential adjustment mechanism that is easy to adjust in order to solve the problem that the existing differential adjustment mechanism is inconvenient to adjust. Utility Model Content

[0005] The present application provides a differential adjustment mechanism and a sewing machine, which can realize rapid adjustment of the differential ratio, have a simple structure, and are easy to use.

[0006] The present application is implemented through the following technical solutions: a differential adjustment mechanism, including a differential swing rod, a differential connecting rod and a crank arranged at one end of the differential swing rod; the crank is provided with an adjustment slot, one side of the differential connecting rod is provided with a differential feed tooth frame assembled and fixed with the differential connecting rod, one end of the differential connecting rod adjusts the assembly position of the differential connecting rod and the crank through a screw rod and a fastener assembled in the adjustment slot, the fastener and the differential feed tooth frame are located on the same side of the differential connecting rod, and the screw rod penetrates the differential connecting rod from the side away from the differential feed tooth frame to screw the fastener. In the technical solution of the present application, by setting the fastener on the same side of the differential feed tooth frame and the screw rod on the other side away from the differential feed tooth frame, there is more room for operation when adjusting the differential ratio or repairing, which shortens the process time and facilitates operation, thereby improving efficiency.

[0007] Furthermore, the crank is provided with a first assembling portion assembled with the differential rocker arm and a second assembling portion provided with an adjustment groove, the adjustment groove comprising a first adjustment groove extending radially from a first end face of the second assembling portion and a second adjustment groove extending radially from a second end face of the second assembling portion.

[0008] Furthermore, a step portion is formed at a connection between the first adjustment groove and the second adjustment groove, and the fastener is received in the second adjustment groove and abuts against the step portion.

[0009] Furthermore, the first adjustment groove and the second adjustment groove have the same contour structure and the step portion is a continuous closed ring, and the step portions at any corresponding positions of the inner wall of the first adjustment groove and the inner wall of the second adjustment groove have the same radial width.

[0010] Furthermore, the differential link is provided with a first linkage part, a second linkage part and a connecting arm connecting the first linkage part and the second linkage part. The first linkage part is provided with a through hole, a sleeve is embedded in the through hole, and the screw rod passes through the sleeve and the first adjustment groove and is assembled and fixed with the fastener.

[0011] Furthermore, a gasket is provided between the sleeve and the screw rod.

[0012] Furthermore, the gasket has a receiving portion and an assembly hole connected to the receiving portion, the head of the screw is received in the receiving portion, and the diameter of the assembly hole is adapted to the diameter of the body of the screw.

[0013] Furthermore, the first assembly portion is provided with a first assembly hole, and one end of the differential rocker arm is provided with an inserting portion embedded in the first assembly hole, and the inserting portion has a cylindrical main body portion and a cutting portion formed from the main body portion.

[0014] Furthermore, the first assembly hole includes an arc portion adapted to the main body and a base adapted to the cutting portion, the arc portion and the base are connected by a limiting portion, the limiting portion is an arc structure and the radius of the limiting portion is smaller than the radius of the arc portion.

[0015] A sewing machine comprises a needle plate, a needle plate frame supporting the needle plate, a differential feed tooth and the differential adjustment mechanism as described above, wherein the differential feed tooth is assembled on the differential feed tooth frame.

[0016] The differential adjustment mechanism and sewing machine provided in the present application arrange the fastener on the same side of the differential feed tooth frame and the screw on the other side away from the differential feed tooth frame, so that there is more space for operation when adjusting the differential ratio or performing maintenance, shortening the process time, facilitating operation, and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the assembly of an exemplary differential adjustment mechanism and a needle plate of the present application.

[0018] Figure 2 It is a schematic diagram of an assembly of an exemplary differential adjustment mechanism and a needle plate at another angle of the present application.

[0019] Figure 3 It is a schematic diagram of another exemplary differential adjustment mechanism of the present application.

[0020] Figure 4 It is a partial assembly diagram of an exemplary differential adjustment mechanism of the present application.

[0021] Figure 5 It is a schematic diagram of an exemplary differential adjustment mechanism of the present application.

[0022] The reference numerals are as follows:

[0023] 100. Differential adjustment mechanism;

[0024] 1. differential swing rod; 10. plug-in part; 11. main body; 12. cutting part;

[0025] 2. crank; 20. first assembly portion; 21. first assembly hole; 210. arc portion; 211. base portion; 212. limit portion;

[0026] 22, second assembly portion; 220, first adjustment groove; 221, second adjustment groove; 223, step portion;

[0027] 3. differential link; 30. first linkage part; 301. through hole; 31. second linkage part; 32. connecting arm;

[0028] 33. Screw; 34. Fastener; 35. Sleeve; 36. Gasket; 361. Accommodation portion; 362. Assembly hole;

[0029] 4. Differential feed dog; 5. Differential feed dog holder; 6. Needle plate holder; 7. Needle plate. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described in detail with reference to the accompanying drawings.

[0031] The technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the drawings in the embodiments of the present application. The technical features in the following embodiments may be combined with each other without conflict. The embodiments described below are only part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present application belong to the scope of protection of this application.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, it should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, a first assembly hole may also be referred to as a second assembly hole, and similarly, a second assembly hole may also be referred to as a first assembly hole.

[0034] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically limited. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] See also Figures 1 to 5 As shown, a sewing machine includes a needle plate 7, a needle plate frame 6 supporting the needle plate, a differential feed dog 4 and a differential adjustment mechanism 100, wherein the differential feed dog 4 is assembled on the differential feed dog frame 5.

[0038] Specifically, the differential adjustment mechanism 100 includes a differential swing rod 1, a differential connecting rod 3, and a crank 2 disposed at one end of the differential swing rod 1; the crank 2 is provided with an adjustment slot. A differential feed tooth frame 5 assembled and fixed with the differential connecting rod is disposed on one side of the differential connecting rod 3, and one end of the differential connecting rod 3 is used to adjust the assembly position of the differential connecting rod and the crank 2 through a screw 33 and a fastener 34 assembled in the adjustment slot, and the fastener 34 is disposed on the same side of the differential feed tooth frame 5, and the screw penetrates the differential connecting rod from the side away from the differential feed tooth frame to be screwed to the fastener. In this technical solution, by setting the fastener 34 on the same side of the differential feed tooth frame 5 and the screw 33 on the other side away from the differential feed tooth frame 5, the screw can be loosened when adjusting the differential ratio or repairing. The space required for loosening the screw is smaller than that for loosening the fastener, that is, the present application has a relatively wider space for operation, which shortens the process time and is convenient for operation, thereby improving efficiency. At the same time, an adjustment slot is set on the crank 2 for the screw 33 and the fastener 34 to adjust and fix the differential connecting rod 3 to any position of the adjustment slot according to the differential ratio required for sewing, thereby realizing stepless adjustment of the differential ratio of the sewing machine, and the overall structure of the mechanism is simple and easy to operate. The fastener can be a nut or other structural member that can be assembled with bolts for fixing.

[0039] Please refer to Figure 3As shown, in one embodiment, the crank and the differential swing arm are detachably connected. Specifically, the crank 2 is provided with a first assembly portion 20 assembled with the differential swing arm 1 and a second assembly portion 22 provided with an adjustment groove. The adjustment groove includes a first adjustment groove 220 extending radially from a first end surface of the second assembly portion 22 and a second adjustment groove 221 extending radially from a second end surface of the second assembly portion 22. The first adjustment groove 220 and the second adjustment groove 221 form a through groove that passes through the second assembly portion 22 in the radial direction.

[0040] A step portion 223 is formed at the connection between the first adjustment groove 220 and the second adjustment groove 221, and the fastener 34 is received in the second adjustment groove 221 and abuts against the step portion 223. The step portion 223 is provided to improve the stability of the fastener 34 and the screw rod 33 after being assembled. In this embodiment, the outer end surface of the fastener 34 is in the same plane as the second end surface of the second assembly portion 22 after being assembled.

[0041] The first adjustment groove 220 and the second adjustment groove 221 have the same profile structure and the step portion 223 is a continuous closed ring. The step portion 223 at any corresponding position of the inner wall of the first adjustment groove and the inner wall of the second adjustment groove has the same radial width. By setting the first adjustment groove 220 and the second adjustment groove 221 to the same shape and forming a step portion 223 at the junction of the two, it can be ensured that the forces of the screw rod 33 and the fastener 34 at any position when the differential ratio is adjusted can be kept equal or similar, which is conducive to improving the service life of the product.

[0042] The differential link 3 is provided with a first linkage part 30, a second linkage part 31 and a connecting arm 32 connecting the first linkage part 30 and the second linkage part 31. The first linkage part 30 is provided with a through hole 301, and a sleeve 35 is embedded in the through hole 301. The screw 33 passes through the sleeve 35 and the first adjustment groove 220 and is assembled and fixed with the fastener 34. The inner diameter of the through hole is the same as the outer diameter of the sleeve 35. The sleeve 35 can prevent the shaking of the differential link 3 caused by the loosening of the screw 33 and the bolt during the use of the sewing machine, thereby ensuring the safety of use. The differential feed tooth frame 5 is assembled with the second linkage part by means of a first screw, and the differential feed tooth is located on the outside of the connecting arm and assembled with the differential feed tooth frame.

[0043] In order to further enhance the reliability of the assembly of the screw rod 33 and the fastener 34 to the differential link 3 , a gasket 36 is provided between the sleeve 35 and the screw rod 33 .

[0044] Specifically, the gasket 36 has a receiving portion 361 and an assembly hole 362 connected to the receiving portion 361. The head of the screw rod 33 is received in the receiving portion 361, and the diameter of the assembly hole 362 is adapted to the rod diameter of the screw rod 33. In this embodiment, the receiving portion 361 is an inverted truncated cone structure. When the screw rod 33 is assembled in place, its head is completely accommodated in the receiving portion 361, which increases the aesthetics of the product and prevents the screw rod 33 from loosening due to collision.

[0045] The first assembly portion 20 is provided with a first assembly hole 21, and one end of the differential swing arm 1 is provided with an inserting portion 10 embedded in the first assembly hole 21. The inserting portion 10 has a cylindrical main body 11 and a cutting portion 12 formed from the main body 11. By setting the inserting portion 10 in a manner of combining the cylindrical main body and the cutting portion 12, the differential swing arm 1 is easily assembled with the crank 2, and the fasteners required for assembling the two are simplified, and the structure is simple.

[0046] The first assembly hole 21 includes an arc portion 210 adapted to the main body 11 and a base portion 211 adapted to the cutting portion 12. The arc portion 210 and the base portion 211 are connected by a limiting portion 212. The limiting portion 212 is an arc-shaped structure and the radius of the limiting portion 212 is smaller than the radius of the arc portion 210. In this embodiment, the arc portion 210 is adapted to the main body 11 and the cutting portion 12 is adapted to the base portion 211 to ensure the stability of the assembly of the differential swing arm 1 and the crank 2. At the same time, the relative rotation of the differential swing arm 1 and the crank 2 within a certain range can be buffered by the setting of the limiting portion 212.

[0047] Indeed, please refer to Figure 4 and Figure 5 As shown, in order to better improve the assembly efficiency of the sewing machine, the crank and the differential rocker arm are configured as an integrated structure.

[0048] The differential adjustment mechanism 100 and the sewing machine provided in the present application arrange the fastener 34 on the same side of the differential feed tooth frame 5 and the screw 33 on the other side away from the differential feed tooth frame 5, so that there is more space for operation when adjusting the differential ratio or maintenance, shortening the process time while facilitating operation and improving efficiency.

[0049] The present application is described by several specific embodiments, and those skilled in the art should understand that various changes and equivalent substitutions can be made to the present application without departing from the scope of the present application. In addition, various modifications can be made to the present application for specific situations or specific circumstances without departing from the scope of the present use model. Therefore, the present application is not limited to the specific embodiments disclosed, but should include all implementation methods falling within the scope of the claims of the present application.

Claims

1. A differential adjustment mechanism, characterized in that: It includes a differential rocker, a differential connecting rod and a crank arranged at one end of the differential rocker; the crank is provided with an adjustment groove, and one side of the differential connecting rod is provided with a differential feed tooth frame assembled and fixed with the differential connecting rod, and one end of the differential connecting rod is used to adjust the assembly position of the differential connecting rod and the crank through a screw rod and a fastener assembled in the adjustment groove, the fastener and the differential feed tooth frame are located on the same side of the differential connecting rod, and the screw rod penetrates the differential connecting rod from the side away from the differential feed tooth frame to be screwed to the fastener.

2. The differential adjustment mechanism according to claim 1, characterized in that: The crank is provided with a first assembly part assembled with the differential rocker and a second assembly part provided with an adjustment groove, wherein the adjustment groove includes a first adjustment groove extending radially from a first end surface of the second assembly part and a second adjustment groove extending radially from a second end surface of the second assembly part.

3. The differential adjustment mechanism according to claim 2, characterized in that: A step portion is formed at a connection between the first adjustment groove and the second adjustment groove, and the fastener is received in the second adjustment groove and abuts against the step portion.

4. The differential adjustment mechanism according to claim 3, characterized in that: The first adjustment groove and the second adjustment groove have the same contour structure, and the step portion is a continuous closed ring. The step portions at any corresponding positions of the inner wall of the first adjustment groove and the inner wall of the second adjustment groove have the same radial width.

5. The differential adjustment mechanism according to claim 4, characterized in that: The differential link is provided with a first linkage part, a second linkage part and a connecting arm connecting the first linkage part and the second linkage part. The first linkage part is provided with a through hole, a sleeve is embedded in the through hole, and the screw rod passes through the sleeve and the first adjustment groove and is assembled and fixed with the fastener.

6. The differential adjustment mechanism according to claim 5, characterized in that: A gasket is arranged between the sleeve and the screw rod.

7. The differential adjustment mechanism according to claim 6, characterized in that: The gasket has a receiving portion and an assembly hole communicated with the receiving portion. The head of the screw is received in the receiving portion. The diameter of the assembly hole is matched with the diameter of the body of the screw.

8. The differential adjustment mechanism according to any one of claims 2 to 7, characterized in that: The first assembly portion is provided with a first assembly hole, and one end of the differential swing arm is provided with an inserting portion embedded in the first assembly hole, and the inserting portion has a cylindrical main body portion and a cutting portion formed from the main body portion.

9. The differential adjustment mechanism according to claim 8, characterized in that: The first assembly hole includes an arc portion adapted to the main body and a base adapted to the cutting portion, the arc portion and the base are connected by a limiting portion, the limiting portion is an arc structure and the radius of the limiting portion is smaller than the radius of the arc portion.

10. A sewing machine comprising a needle plate, a needle plate frame supporting the needle plate and a differential feed dog, characterized in that: It comprises the differential adjustment mechanism as described in any one of claims 1 to 9, wherein the differential feed dog is assembled on the differential feed dog frame.

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