Sewing machine with improved positioning of the lifting hooks

Abstract

The present application particularly relates to a sewing machine with improved positioning effect of hook group, comprising a machine base shell, a hook group, the machine base shell has a cover plate assembly surface, an installation space in the machine base shell, and a shaft connecting block formed in the installation space, the shaft connecting block is formed with a shaft hole and has a bearing platform facing the cover plate assembly surface, the height of the bearing platform is lower than that of the cover plate assembly surface, the hook group has a working shaft penetrating the shaft hole, a connecting rod group connected with the working shaft and driven to drive a hook to perform cloth feeding operation, and a shaft positioning member sleeved on the working shaft, the shaft positioning member comprises a sleeve ring sleeved on the working shaft, an extension arm extending from the sleeve ring, and a fixed arm connected with the extension arm and fixed on the bearing platform, the fixed arm and the extension arm have an included angle therebetween.

Description

Technical Field

[0001] This invention relates to a sewing machine, and more particularly to a sewing machine that improves the positioning effect of the hook teeth assembly. Background Technology

[0002] Please see Figure 1 In a conventional sewing machine 90, a hook tooth assembly 91 performs fabric feeding. The sewing machine 90 has a base housing 92. The hook tooth assembly 91 is connected to the base housing 92 via a working shaft 911 and a shaft connector 912 to position the working shaft 911. More specifically, after the shaft connector 912 is fitted onto the working shaft 911, a positioning pin 913 on the connector is inserted into a through hole 921 in the base housing 92. The diameter of the through hole 921 engages with the positioning pin 913, and an auxiliary positioning member 914, which penetrates the base housing 92 to press the positioning pin 913, achieves the positioning effect.

[0003] However, the aforementioned positioning mechanism relies heavily on machining density. If the diameter of the through hole 921 is too large, or if the size of the positioning pin 913 fails to match the through hole 921, the positioning effect will be weakened, which will also be detrimental to the assembly of the hook tooth assembly 91. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and to provide a sewing machine that improves the positioning effect of the hook teeth assembly.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows:

[0006] A sewing machine for improving the positioning effect of a hook tooth assembly includes a base housing and a hook tooth assembly. The base housing has a cover plate assembly surface, an installation space located inside the base housing, and a shaft connecting block formed in the installation space. The shaft connecting block has a shaft hole and a support platform facing the cover plate assembly surface. The height of the support platform is lower than the cover plate assembly surface. The hook tooth assembly is disposed in the installation space. The hook tooth assembly has a working shaft passing through the shaft hole, a linkage assembly connected to the working shaft and driven to drive a hook tooth to perform fabric feeding operations, and a shaft positioning member fitted onto the working shaft. The shaft positioning member includes a collar fitted onto the working shaft, an extension arm extending from the collar, and a fixed arm connected to the extension arm and fixed to the support platform. The fixed arm and the extension arm have an included angle.

[0007] In one embodiment, the shaft block has at least one opening on the bearing platform, and the fixing arm forms at least one through hole facing the opening and assembling at least one fixing member.

[0008] In one embodiment, the perforation tool has a variable aperture.

[0009] In one embodiment, at least two outer edges of the support platform are open.

[0010] In one embodiment, the fixing arm has a bottom surface that contacts the bearing platform and a top surface opposite the bottom surface, the height of the top surface being lower than the cover plate assembly surface.

[0011] Compared with the prior art, the present invention has the following advantages and effects: the present invention uses the bearing platform of the base housing and the shaft positioning component for positioning, thereby increasing the assembly area of ​​the hook gear assembly and the base housing, and reducing the problems arising from the conventional reliance on machining precision. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the existing structure.

[0013] Figure 2 This is a schematic diagram of a sewing machine structure according to an embodiment of the present invention.

[0014] Figure 3 This is an exploded view of the structure of an embodiment of the present invention.

[0015] Figure 4 This is a schematic cross-sectional view of an embodiment of the present invention.

[0016] Figure 5 This is a cross-sectional schematic diagram of some components according to an embodiment of the present invention. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0018] Example

[0019] Please see Figures 2 to 5The present invention provides a sewing machine 100, which includes a base housing 10 and a hook tooth assembly 20. The base housing 10 is connected to a sewing head 30 of the sewing machine 100 and together with the sewing head 30 performs sewing operations. The base housing 10 has an installation space 11, a cover plate assembly surface 12, and a shaft connecting block 13. The installation space 11 is located inside the base housing 10 and provides the hook tooth assembly 20 therein. The cover plate assembly surface 12 is located on one side of the base housing 10 and provides a cover plate (not shown in the figure) for assembly. When the cover plate assembly surface 12 is not assembled with the cover plate, the installation space 11 can be directly observed from the side of the base housing 10 where the cover plate assembly surface 12 is located. Once the cover plate assembly surface 12 is assembled with the cover plate, the installation space 11 is covered. The shaft connector 13 is formed from the base housing 10 and is disposed in the installation space 11. The shaft connector 13 has a shaft hole 131 and a bearing platform 132. The bearing platform 132 faces the cover plate assembly surface 12. When viewed from the side of the base housing 10, the bearing platform 132 is not coplanar with the cover plate assembly surface 12, but is lower than the cover plate assembly surface 12.

[0020] The hook tooth assembly 20 is disposed in the installation space 11. The hook tooth assembly 20 has a hook tooth (not shown in the figure), a working shaft 21, a connecting rod assembly 22 and a shaft positioning member 23. The working shaft 21 passes through the shaft hole 131 and works after being driven. The connecting rod assembly 22 connects the working shaft 21 and the hook tooth. After being driven by the working shaft 21, the connecting rod assembly 22 drives the hook tooth to reciprocate, thereby causing the hook tooth to perform the fabric feeding operation. The shaft positioning member 23 is sleeved on the working shaft 21 and is assembled with the shaft connecting block 13 to position the working shaft 21. The shaft positioning component 23 is an integrally formed structure, comprising a collar 231, an extension arm 232, and a fixed arm 233. The collar 231 is sleeved on the working shaft 21, allowing the working shaft 21 to rotate therein. The extension arm 232 extends from the collar 231 toward the cover plate assembly surface 12. The fixed arm 233 connects to the extension arm 232 and extends toward the support platform 132. An included angle 235 is formed between the fixed arm 233 and the extension arm 232, causing the fixed arm 233 to bend relative to the extension arm 232 and thus be fixed to the support platform 132. In one embodiment, the included angle 235 is 90 degrees.

[0021] Furthermore, when the shaft positioning component 23 is assembled, the shaft positioning component 23 is fitted onto the working shaft 21 with the collar 231 and fixed to the bearing platform 132 with the fixing arm 233. The shaft positioning component 23 does not affect the operation of the working shaft 21 and can provide basic positioning for the working shaft 21. Compared with the conventional method, in order to improve the positioning effect of the hook tooth assembly 20, the present invention uses the bearing platform 132 of the base housing 10 and the shaft positioning component 23 for positioning, thereby increasing the assembly area of ​​the hook tooth assembly 20 and the base housing 10, and thus reducing the problem of poor assembly caused by the machining precision of the conventional structure.

[0022] Please refer to the following: Figure 3 In one embodiment, the toothed assembly 20 has at least one bearing 27 disposed on the working shaft 21. See also... Figures 2 to 5 The shaft connector 13 has at least one opening 133 on the support platform 132. The fixing arm 233 has at least one through hole 236 facing the opening 133. The through hole 236 faces the opening 133 and is provided with at least one fixing member 26. The at least one fixing member 26 passes through the through hole 236 and the opening 133 in sequence to fix the fixing arm 233 on the support platform 132. Further, the through hole 236 of the present invention has a variable diameter. The through hole 236 has a first port 237 facing the cover plate assembly surface 12 and a second port 238 facing the support platform 132. The diameter of the first port 237 is larger than that of the second port 238, and the second port 238 is larger than that of the opening 133. This allows the fixing arm 233 to still be connected to the opening 133 after slight adjustment relative to the support platform 132. Furthermore, the fixing arm 233 has at least one assembly pad 245 disposed in the through hole 236. Additionally, to increase the assembly margin between the shaft positioning member 23 and the support platform 132, at least two outer edges of the support platform 132 are open, and the periphery of the support platform 132 is not completely surrounded by the wall surface (as shown in reference numeral 14) formed by the base housing 10, thus allowing the fixing arm 233 to extend beyond the outer edge of the support platform 132. In another embodiment, the shaft positioning member 23 has at least one arcuate surface 239 disposed at one end of the fixing arm 233 away from the extension arm 232, and the at least one arcuate surface 239 mates with the wall surface (as shown in reference numeral 14) formed by the base housing 10.

[0023] In another embodiment, the thickness of the fixing arm 233 of the present invention is less than the distance between the support platform 132 and the cover plate assembly surface 12. The fixing arm 233 has a bottom surface 240 that contacts the support platform 132 and a top surface 241 opposite to the bottom surface 240. Viewed from the side of the sewing machine 100, the height of the top surface 241 is lower than the cover plate assembly surface 12, so that the top surface 241 is not coplanar with the cover plate assembly surface 12. Furthermore, the bottom surface 240 of the present invention is a non-continuous plane. The bottom surface 240 is divided into a contact segment 242 that contacts the support platform 132 and a connecting segment 243 that continues the contact segment 242 adjacent to the side of the extension arm 232. There is a gap 244 between the contact segment 242 and the connecting segment 243.

[0024] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components, etc. The above description is merely illustrative of the structure of the present invention. All equivalent or simple variations made based on the structure, features, and principles described in this patent concept are included within the protection scope of this patent. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to substitute them, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, all of which should fall within the protection scope of this invention.

Claims

1. A sewing machine that improves the positioning effect of the hook teeth assembly, characterized in that: Include A base housing has a cover plate assembly surface, a mounting space located inside the base housing, and a shaft connecting block formed in the mounting space. The shaft connecting block has a shaft hole and a bearing platform facing the cover plate assembly surface, the height of the bearing platform being lower than the cover plate assembly surface; and A hook tooth assembly is provided in the installation space. The hook tooth assembly has a working shaft passing through the shaft hole, a linkage assembly connected to the working shaft and driven to drive a hook tooth to perform a fabric feeding operation, and a shaft positioning member fitted onto the working shaft. The shaft positioning member includes a collar fitted onto the working shaft, an extension arm extending from the collar, and a fixed arm connected to the extension arm and fixed to the bearing platform. The fixed arm and the extension arm have an included angle.

2. The sewing machine for improving the positioning effect of the hook teeth group according to claim 1, characterized in that: The shaft block has at least one opening on the bearing platform, and the fixing arm forms at least one through hole facing the opening and assembling at least one fixing member.

3. The sewing machine for improving the positioning effect of the hook teeth group according to claim 2, characterized in that: The diameter of the perforator varies.

4. The sewing machine for improving the positioning effect of the hook teeth group according to any one of claims 1-3, characterized in that: At least two outer edges of the platform are open.

5. The sewing machine for improving the positioning effect of the hook teeth group according to claim 4, characterized in that: The fixed arm has a bottom surface that contacts the bearing platform and a top surface opposite the bottom surface, the height of which is lower than the cover plate assembly surface.

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