Sewing machine for implementing intermittent cloth feeding operation

Abstract

The present application particularly relates to a sewing machine for realizing intermittent cloth feeding operation, comprising a cloth feeding assembly and an intermittent driving assembly. The cloth feeding assembly comprises a cloth feeding wheel and a transmission rod connected to the cloth feeding wheel. The intermittent driving assembly comprises a driving body, a planetary gear assembly connected to the driving body and driving the transmission rod based on the driving body. The driving body has an axis, an eccentric wheel arranged at the axis, and an output connected to the eccentric wheel and the planetary gear assembly. The eccentric wheel is shaped with a plurality of first teeth at the outer edge. The output is shaped with a plurality of second teeth matched with the first teeth. The eccentric wheel performs an elliptical motion relative to the output after being driven by the axis. The output outputs kinetic energy to the planetary gear assembly only when the first teeth engage the second teeth.

Description

TECHNICAL FIELD

[0001] The present invention relates to a sewing machine, in particular to a sewing machine capable of intermittent cloth feeding operation. BACKGROUND

[0002] The current sewing machine intermittent cloth feeding technology is disclosed in Chinese Patent CN115670083A, Chinese Patent CN101733342, Japanese Patent JP2023020867A, Chinese Patent CN1827007A, Japanese Patent JP4602120, and Chinese Patent CN2848898Y. In the Chinese Patent CN2848898Y, although the eccentric wheel is used to drive the upper cloth feeding wheel intermittently, the actual operation is that the eccentric wheel sequentially drives the transmission device and the game lever, and then drives the upper cloth feeding wheel to rotate. The above-mentioned cloth feeding mechanism has a complex structure and relies on the cooperation between the levers, which is not conducive to implementation.

[0003] In addition, the rotation of the upper cloth feeding wheel of the Chinese Patent CN2848898Y depends on the swing amplitude of the game lever, which is not conducive to reducing the internal space of the sewing machine. Moreover, if the cloth feeding amount of the upper cloth feeding wheel is to be increased, the swing frequency of the game lever needs to be increased, which may easily cause the motor to be overloaded. SUMMARY

[0004] The present invention aims to overcome the above-mentioned deficiencies in the prior art and provide a sewing machine capable of intermittent cloth feeding operation.

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

[0006] A sewing machine capable of intermittent cloth feeding operation comprises a cloth feeding assembly and an intermittent driving assembly. The cloth feeding assembly comprises a cloth feeding wheel and a transmission lever connected to the cloth feeding wheel. The intermittent driving assembly comprises a driving body, a planetary gear set connected to the driving body and driving the transmission lever based on the driving body, an eccentric shaft, an eccentric wheel arranged on the eccentric shaft, and an output member connected to the eccentric wheel and the planetary gear set. The driving body has an axis, an eccentric wheel arranged on the axis, and an output member connected to the eccentric wheel and the planetary gear set. The eccentric wheel is shaped with a plurality of first teeth on the outer edge. The output member is shaped with a plurality of second teeth matched with the first teeth. The eccentric wheel performs an elliptical motion relative to the output member after being driven by the axis. The output member outputs kinetic energy to the planetary gear set only when the first teeth engage the second teeth.

[0007] In an embodiment, the output member has an output shaft connected to the planetary gear set, and a sleeve connected to the output shaft and providing the eccentric wheel arranged therein. The inner wall of the sleeve is shaped with the second teeth.

[0008] In an embodiment, the driving body has a first shell providing the axis arranged therein, and a second shell connected to the first shell and providing the output member arranged therein.

[0009] In one embodiment, the drive body has a plurality of bearings disposed on the shaft and the output member.

[0010] In one embodiment, the planetary gear set includes a plurality of gears with unequal diameters.

[0011] In one embodiment, the drive body has a drive belt connected to the shaft, and the sewing machine has a feed assembly connected to the drive belt.

[0012] In one embodiment, the drive body has an opening disposed in the first housing and provides the drive belt to connect the shaft and the fabric feeding assembly.

[0013] Compared with the prior art, the present invention has the following advantages and effects: The eccentric wheel of the present invention is provided with the first teeth, the output member is connected to the eccentric wheel and is provided with the second teeth that cooperate with the first teeth, the eccentric wheel is driven by the shaft to move eccentrically, and then moves the elliptical motion stroke relative to the output member, so that when the second teeth of the output member are meshed with the first teeth, kinetic energy is output to the planetary gear set. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0015] Figure 2 This is a partial three-dimensional structural schematic diagram of an embodiment of the present invention.

[0016] Figure 3 This is a partial structural cross-sectional schematic diagram of an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the elliptical motion stroke according to an embodiment of the present invention (I).

[0018] Figure 5 This is a schematic diagram (II) of the elliptical motion stroke according to an embodiment of the present invention. Detailed Implementation

[0019] 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.

[0020] Example

[0021] Please see Figure 1 The present invention provides a sewing machine 100 for intermittent fabric feeding operations. The sewing machine 100 can actually be a zipper sewing machine or other types of sewing devices.

[0022] Please see Figures 1 to 4The sewing machine 100 includes a fabric feeding assembly 10 and an intermittent drive assembly 20. The fabric feeding assembly 10 is used for feeding fabric. The fabric feeding assembly 10 includes a fabric feeding wheel 11 and a drive rod 12. The fabric feeding wheel 11 faces a pressure wheel 30 of the sewing machine 100. The drive rod 12 is connected to the fabric feeding wheel 11 and drives the fabric feeding wheel 11 after being driven, so that the fabric feeding wheel 11 rotates relative to the pressure wheel 30 after being driven, thereby driving the fabric to perform the fabric feeding operation.

[0023] The intermittent drive assembly 20 is connected to the belt assembly 10 and intermittently drives the belt assembly 10. The intermittent drive assembly 20 includes a drive body 21 and a planetary gear set 25. The planetary gear set 25 connects the drive body 21 and the transmission rod 12, and drives the transmission rod 12 based on the operation of the drive body 21. The drive body 21 has a shaft 211, an eccentric wheel 212 and an output component 213. The shaft 211 is the main driver of the drive body 21. The eccentric wheel 212 is connected to the shaft 211 and is eccentrically set relative to the shaft 211. The output component 213 connects the eccentric wheel 212 and the planetary gear set 25. The output component 213 is regarded as the kinetic energy outputter of the drive body 21, that is, after being driven, the output component 213 outputs kinetic energy to drive the planetary gear set 25. The eccentric wheel 212 is an external gear, with a plurality of first teeth 214 located on its outer edge. The output member 213 has a plurality of second teeth 215. These second teeth 215 are located at one end of the output member 213 connected to the eccentric wheel 212 and engage with the first teeth 214; that is, the second teeth 215 are internal teeth. During operation, the second teeth 215 do not normally mesh with the first teeth 214 because the diameter enclosed by the second teeth 215 is slightly larger than the diameter enclosed by the first teeth 214, allowing the eccentric wheel 212 to perform an elliptical motion within it, as if... Figure 4 and Figure 5 As shown. When the eccentric wheel 212 is driven by the shaft 211, it will move eccentrically and make an elliptical motion relative to the output member 213. The output member 213 does not normally contact the eccentric wheel 212 when the eccentric wheel 212 makes an elliptical motion, so that the output member 213 outputs kinetic energy to the planetary gear set 25 only when the first teeth 214 mesh with the second teeth 215.

[0024] Please see Figures 3 to 5The implementation of the sewing machine 100 will now be described. Assuming the drive body 21 is initially not activated, once the shaft 211 is driven, it drives the eccentric wheel 212 to rotate. At this time, the eccentric wheel 212 travels an elliptical motion relative to the output member 213, selectively contacting the output member 213. When the eccentric wheel 212 engages the second teeth 215 with the first teeth 214 during the elliptical motion, the output member 213 rotates with the eccentric wheel 212, thus outputting kinetic energy to the planetary gear set 25. Subsequently, the planetary gear set 25 drives the transmission rod 12, and further drives the cloth pulley 11 to rotate. Alternatively, when the eccentric wheel 212 travels an elliptical motion, if the first teeth 214 do not engage the second teeth 215, the output member 213 is not driven. At this time, the planetary gear set 25 cannot be driven, and thus cannot drive the cloth pulley 11. Subsequently, when the eccentric wheel 212 completes the elliptical motion and engages with the first teeth 214 and the second teeth 215, the output component 213 is driven again, thereby causing the belt pulley 11 to rotate.

[0025] As described above, the present invention, through the arrangement of the eccentric wheel 212 and the output component 213 within the drive body 21, allows the output component 213 to drive the planetary gear set 25 based on the rotation of the eccentric wheel 212, thereby causing the cloth-feeding wheel 11 to rotate intermittently, achieving the effect of intermittent cloth feeding. Compared to conventional methods, the structure disclosed in the present invention is simple, and through the arrangement of the planetary gear set 25, the space required for component installation and the burden on the drive body 21 are reduced.

[0026] Please refer to the above. Figures 2 to 5 To improve the efficiency of the drive body 21, in one embodiment, the planetary gear set 25 includes a plurality of gears 251 with unequal diameters, resulting in different numbers of teeth on each gear 251. These gears 251 are sequentially connected, with one set of gear 251 mounted on the output member 213, another set on the transmission rod 12, and the remaining gears 251 interlocking with the aforementioned two gears 251. In this embodiment, the diameter of the gears 251 increases sequentially along the transmission path from the output member 213 to the transmission rod 12; that is, the gear 251 mounted on the output member 213 has the smallest diameter, while the gear 251 mounted on the transmission rod 12 has the largest diameter.

[0027] Please also refer to Figures 2 to 5The output component 213 of the present invention includes an output shaft 217 connected to the planetary gear set 25 and a sleeve 218 connected to the output shaft 217. The sleeve 218 is located on the side of the output shaft 217 adjacent to the eccentric wheel 212 and has second teeth 215 formed on its inner wall. The sleeve 218 provides the eccentric wheel 212 for placement therein and allows the eccentric wheel 212 to perform the elliptical motion stroke therein. In another embodiment, to enable smooth rotation of the output component 213 and the shaft 211, the drive body 21 has a plurality of bearings 219 disposed on the output component 213 and the shaft 211.

[0028] On the other hand, please see Figures 1 to 5 In one embodiment, the drive body 21 has a first housing 220 and a second housing 221 connected to the first housing 220. The interior of the first housing 220 is hollow to provide a space for the shaft 211. The second housing 221 is located on the side of the first housing 220 near the planetary gear set 25 and provides a space for the output member 213 to pass through. Furthermore, in order to assemble the drive body 21 onto a housing 40 of the sewing machine 100, in one embodiment, the second housing 221 has a base portion 222 connected to the first housing 220 and an assembly portion 223 connected to the base portion 222 and assembled with the housing 40. The assembly portion 223 suspends the first housing 220 relative to the housing 40. In addition, the second housing 221 further includes a gear auxiliary mounting portion 224 connected to the base portion 222, which provides for the assembly of at least one of the gears 251 of the planetary gear set 25.

[0029] In addition to the foregoing, please refer to the following: Figures 1 to 5 The sewing machine 100 of the present invention further includes a feed assembly 50 connected to an intermittent drive assembly 20. The feed assembly 50 has a feed tooth (not shown) and a working shaft 51 connected to the feed tooth. The drive body 21 has a transmission belt 225 connected to the working shaft 51. The transmission belt 225 is connected to and driven by the shaft 211. After being driven by the shaft 211, the transmission belt 225 drives the working shaft 51. Further, to assist the transmission of the transmission belt 225, in one embodiment, a plurality of ratchet teeth 226 are formed on the transmission belt 225. The feed assembly 50 has a transmission ratchet 52 set on the working shaft 51. The ratchet teeth 226 cooperate with the transmission ratchet 52. When the transmission belt 225 is working, at least one of the ratchet teeth 226 drives the transmission ratchet 52. In another embodiment, the drive body 21 has a drive ratchet 227 disposed on the shaft 211, the drive ratchet 227 engaging with the ratchet teeth 226 to drive the transmission belt 225.

[0030] In another embodiment, the drive body 21 has an opening 228 provided in the first housing 220, through which the drive belt 225 passes, so that the drive belt 225 can connect the shaft 211 and the fabric feeding assembly 50.

[0031] 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 for intermittent fabric feeding, characterized in that: Include A fabric belt assembly, comprising a fabric belt pulley and a drive rod connecting the fabric belt pulley; and An intermittent drive assembly includes a drive body and a planetary gear set connected to the drive body and driving the transmission rod based on the operation of the drive body. The drive body has a shaft, an eccentric wheel eccentrically disposed on the shaft, and an output member connecting the eccentric wheel and the planetary gear set. The eccentric wheel has a plurality of first teeth on its outer edge, and the output member has a plurality of second teeth that mesh with the first teeth. After being driven by the shaft, the eccentric wheel performs an elliptical motion stroke relative to the output member. The output member outputs kinetic energy to the planetary gear set only when the first teeth mesh with the second teeth.

2. The sewing machine for intermittent fabric feeding operation according to claim 1, characterized in that: The output component has an output shaft connected to the planetary gear set, and a sleeve connected to the output shaft and providing the eccentric wheel therein, the inner wall of the sleeve being formed with the second teeth.

3. The sewing machine for intermittent fabric feeding operation according to claim 1 or 2, characterized in that: The drive body has a first housing in which the shaft is disposed, and a second housing connected to the first housing and in which the output component passes through.

4. The sewing machine for intermittent fabric feeding operation according to any one of claims 3, characterized in that: The drive body has a plurality of bearings located at the shaft and the output component.

5. The sewing machine for intermittent fabric feeding operation according to claim 4, characterized in that: The planetary gear set contains a plurality of gears of different diameters.

6. The sewing machine for intermittent fabric feeding operation according to claim 3, characterized in that: The drive body has a drive belt connected to the shaft, and the sewing machine has a fabric feeding assembly connected to the drive belt.

7. The sewing machine for intermittent fabric feeding operation according to claim 6, characterized in that: The drive body has an opening located in the first housing and provides the drive belt to connect the shaft to the fabric feeding assembly.

Images