Sewing machine
The sewing machine addresses the limitations of conventional machines by integrating an upper unit with a link-driven needle bar and a lower unit with a linearly restricted lower hook, enabling adjustable stroke distances and synchronized needle movements for functional fabrics.
Patent Information
- Application Number
- JP2024006389
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-18
- Publication Date
- 2025-07-31
- Estimated Expiration
- 2044-01-18
AI Technical Summary
Conventional sewing machines fail to meet the diverse sewing needs of functional fabrics requiring varied stroke distances and hook directions.
A sewing machine design incorporating an upper sewing unit with a link-driven needle bar and a lower sewing unit with a linearly reciprocating lower hook, featuring a guide component that restricts the lower hook's motion to a straight path, allowing for adjustable stroke distances and synchronized needle movements.
The design accommodates the sewing requirements of functional fabrics by ensuring larger stroke distances at the uppermost needle position and synchronized linear motion, enhancing the sewing capabilities for diverse fabrics.
Smart Images
Figure 2025112218000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a sewing machine, and more particularly to a sewing machine that changes the stroke distance of a needle bar and the traveling direction of a lower hook.
Background Art
[0002] With the maturity of modern textile industry technology and the development of material technology, various fabrics with different materials and characteristics from conventional fabrics have been developed. Also, modern people not only require the appropriateness of clothing when wearing clothes, but also the functionality and efficacy of clothing. In order to meet the functional design of functional clothing, more diverse sewing methods are required, thereby meeting the sewing needs of functional fabrics and functional clothing. For different functional fabrics and efficacy settings, designing a sewing machine that changes the stroke distance of the needle bar and the direction of the lower hook can correspond to the sewing needs of functional fabrics.
Summary of the Invention
Problems to be Solved by the Invention
[0003] The main object of the present invention is to solve the problem that conventional sewing machines cannot meet the sewing needs required for functional fabrics.
Means for Solving the Problems
[0004] To achieve the above object, the present invention provides a sewing machine including an upper sewing unit and a lower sewing unit. The upper sewing unit includes a first drive shaft, a link connected to the first drive shaft, and a needle bar driven by the link. The link has a first end connected to the first drive shaft and moving in a circular locus following the first drive shaft, and a second end connected to the needle bar and operating within a guide rail. The second end moves in a linear locus, and there is no overlapping portion between the linear locus and the circular locus. The horizontal height of the operating range of the linear locus is higher than the horizontal height of the circular locus. The lower sewing unit includes a second drive shaft in an interlocking relationship with the first drive shaft, a transmission link set connected to the second drive shaft, a lower hook drive shaft connected to the transmission link set, a lower hook provided on the lower hook drive shaft and working together with a plurality of needles on the needle bar, and a guide component through which the lower hook drive shaft is drilled. The transmission link set includes a first swing arm connected to the lower hook drive shaft. The guide component is formed as two guide rings provided separately and through which the lower hook drive shaft is drilled, and the two guide rings limit the lower hook drive shaft to be able to perform only linear reciprocating motion.
[0005] In one embodiment, the sewing machine includes a housing, and the housing defines a space in which the lower hook is displaced in the linear reciprocating motion.
[0006] In one embodiment, the guide component is formed as a linear rail located between the two guide rings, and the lower hook drive shaft includes a collar and a limiting block provided on the collar and operating within the linear rail.
[0007] In one embodiment, the second drive shaft includes a fixed collar, and the guide component is formed with a mounting bump assembled to the fixed collar.
[0008] In one embodiment, the transmission link set includes a second swing arm connected to the second drive shaft, a rocker arm connected to the second swing arm, and a connecting rod connecting the rocker arm and the first swing arm.
[0009] In one embodiment, the arrangement direction of these needles on the needle bar is parallel to the lower hook and the lower hook drive shaft.
[0010] In one embodiment, the first drive shaft is provided with a cam component for connecting the link, and the assembly position of the link on the cam component is offset from the axis of the cam component.
[0011] In one embodiment, the sewing machine is provided with a belt for interlocking the first drive shaft and the second drive shaft. The first drive shaft is provided with a first pulley connected to the belt, and the second drive shaft is provided with a second pulley connected to the belt.
Advantages of the Invention
[0012] The present invention implemented as described above has the following characteristics compared with the conventional ones. In the present invention, due to the configuration design of the upper sewing unit, the stroke distance with respect to the needle plate when these needles are at the uppermost point is larger than the stroke distance with respect to the needle plate when these needles are at the lowermost point, which is suitable for the knitting needs and the design of the present invention with the lower sewing unit provided. The lower hook is driven by the lower hook drive shaft to perform a linear reciprocating motion, so that the sewing machine can meet the sewing needs of more novel functional fabrics.
Brief Description of the Drawings
[0013]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Mode for Carrying Out the Invention
[0014] The present invention will be described in detail with reference to the drawings. Referring to FIGS. 1 to 8, the present invention provides a sewing machine 10, the sewing machine 10 includes an upper sewing unit 20 and a lower sewing unit 30, the upper sewing unit 20 includes a first drive shaft 21, a link 22, a needle bar 23, and a guide rail 24, the link 22 is driven according to the operation of the first drive shaft 21, and the link 22 drives the needle bar 23, the link 22 includes a first end 221 and a second end 222, the first end 221 is connected to the first drive shaft 21, the second end 222 is connected to the needle bar 23 and operates within the guide rail 24. The needle bar 23 includes a plurality of needles 27 facing the lower sewing unit 30, and these needles 27 do not interfere with each other and are arranged in the same direction. The first end 221 moves in a circular locus 25 according to the rotation of the first drive shaft 21, the link 22 is driven by the first drive shaft 21, the second end 222 moves in conjunction with the first end 221, the second end 222 is accommodated within the guide rail 24, and since the guide rail 24 is a rail of a straight path, the second end 222 is restricted by the guide rail 24 and can only move in a straight locus 26. Specifically, the guide rail 24 is located on the first drive shaft 21, and there is no overlapping part between the straight locus and the circular locus. When the assembly of the sewing machine 10 is completed, the second end 222 of the link 22 is higher than the first end 221.
[0015] The lower sewing unit 30 includes a second drive shaft 31, a transmission link set 32, a lower hook drive shaft 33, a lower hook 34, and a guide component 35. The second drive shaft 31 is in an interlocking relationship with the first drive shaft 21, and the second drive shaft 31 is interlocked with the first drive shaft 21 via a belt 43. The transmission link set 32 is connected to the second drive shaft 31, the transmission link set 32 is connected to the lower hook drive shaft 33, and the lower hook drive shaft 33 reciprocates under the drive of the transmission link set 32. A lower hook 34 is provided at one end of the lower hook drive shaft 33, and when the lower hook drive shaft 33 reciprocates, the lower hook 34 also reciprocates. A guide component 35 is provided on the lower hook drive shaft 33. The guide component 35 is formed as two guide rings 351. The two guide rings 351 are provided at a distance from each other and the lower hook drive shaft 33 is perforated therein, and the two guide rings 351 are provided to fit the transmission link set 32, thereby restricting the lower hook drive shaft 33 so that it can only perform linear reciprocating motion.
[0016] Also, referring to FIGS. 1 to 8, in one embodiment, the sewing machine 10 includes a housing 40. The housing 40 defines a space 41 in which the lower hook 34 is displaced in the linear reciprocating motion. The housing 40 includes a needle plate 42, and the needle plate 42 is provided on the lower hook 34. Also, referring to FIGS. 5 to 7, in one embodiment, the height of the first end 221 of the link 22 with respect to the needle plate 42 is always lower than the height of the second end 222 with respect to the needle plate 42. That is, the height of the guide rail 24 with respect to the needle plate 42 is always higher than the height of the first drive shaft 21 with respect to the needle plate 42, and the horizontal height of the operating range of the linear locus 26 is higher than the horizontal height of the circular locus 25. Also, these needles 27 on the needle bar 23 are provided towards the needle plate 42. The distance between the uppermost point of these needles 27 and the needle plate 42 is the first stroke distance 231, and the distance between the lowermost point of these needles 27 and the needle plate 42 is the second stroke distance 232. The first stroke distance 231 is greater than the second stroke distance 232, thereby meeting the knitting needs.
[0017] Referring to FIG. 3, the guide component 35 is installed on the lower hook drive shaft 33 by two guide rings 351. In one embodiment, the guide component 35 is formed as a linear rail 352 located between the two guide rings 351, and the linear rail 352 is parallel to the lower hook drive shaft 33. The lower hook drive shaft 33 includes a collar 331 and a limiting block 332. The collar 331 is located between the two guide rings 351, thereby restricting the collar 331 to operate only between the two guide rings 351. The limiting block 332 is provided on the collar 331, and the limiting block 332 is designed to fit the linear rail 352. The limiting block 332 can only operate within the linear rail 352. Therefore, the collar 331 is restricted by the linear rail 352 so that its movement is limited to only the linear reciprocating motion.
[0018] Referring to FIG. 3, in one embodiment, the second drive shaft 31 includes a fixed collar 311, and the guide component 35 is formed with a mounting bump 312. The mounting bump 312 is assembled to the fixed collar 311 and is mounted on the linear rail 352. When installing the mounting bump 312, it is assumed that it does not interfere with the operation within the linear rail 352.
[0019] Referring to FIG. 3, in one embodiment, the transmission link set 32 includes a first swing arm 321, a second swing arm 322, a rocker arm 323, and a connecting rod 324. One end of the second swing arm 322 is connected to the second drive shaft 31. The rocker arm 323 connects the second swing arm 322 and the connecting rod 324. The connecting rod 324 is connected to one end of the first swing arm 321, and the other end of the first swing arm 321 is connected to the lower hook drive shaft 33. The portion of the first swing arm 321 connected to the lower hook drive shaft 33 is located between the two guide rings 351. The first swing arm 321 transmits the movement of the lower hook drive shaft 33. Specifically, the swinging distance of the first swing arm 321 is located between the two guide rings 351, and the movement direction of the first swing arm 321 is restricted by the collar 331.
[0020] Also, referring to FIGS. 8 to 10, in one embodiment, the arrangement direction of these needles 27 on the needle bar 23 is parallel to the lower hook 34 and the lower hook drive shaft 33. In the installation of this embodiment, the arrangement direction of these needles 27 is perpendicular to the sewing direction.
[0021] Also, referring to FIGS. 2 to 7, in one embodiment, the first drive shaft 21 includes a cam part 211 for connecting the link 22. The cam part 211 is driven by the rotation of the first drive shaft 21. The assembly position of the cam part 211 of the link 22 is offset from the axis of the cam part 211. The link 22 is assembled to the cam part 211 at the first end 221. The first end 221 forms a circular locus 25 by the rotation of the cam part 211. Also, referring to FIGS. 1 to 5, the first end 221 is located at the 12 o'clock position of the cam part 211. That is, the first end 221 is located at the highest point with respect to the needle plate 42. At this time, the link 22 is parallel to the needle bar 23, the positions of these needles 27 are the highest with respect to the needle plate 42, and the distance between these needles 27 and the needle plate 42 is the first stroke distance 231. Further referring to FIG. 6, due to the rotation of the cam part 211, the first end 221 is located at the 3 o'clock position of the cam part 211. At this time, these needles 27 can pass through at least one hole on the needle plate 42, and the other side of these needles 27 entering the needle plate 42 with respect to the needle plate 42 is, that is, within the range of the space 41. Further referring to FIG. 7, the first end 221 is located at the 6 o'clock position of the cam part 211. That is, the first end 221 is located at the lowest point with respect to the needle plate 42. At this time, the link 22 is parallel to the needle bar 23, the positions of these needles 27 are the lowest with respect to the needle plate 42, and the distance between these needles 27 and the needle plate 42 is the second stroke distance 232. Note that in order to meet the knitting needs, the first stroke distance 231 is greater than the second stroke distance 232.
[0022] Referring to FIG. 2, the sewing machine 10 includes a belt 43. In one embodiment, the belt 43 is for interlocking the first drive shaft 21 and the second drive shaft 31. The first drive shaft 21 includes a first pulley 212 connected to the belt 43, and the second drive shaft 31 includes a second pulley 313 connected to the belt 43. The second drive shaft 31 is driven by the belt 43 through the second pulley 313 to interlock the first pulley 212 and rotate the first drive shaft 21. The belt 43 includes a tooth portion 431 that fits the first pulley 212 and the second pulley 313.
Explanation of Reference Numerals
[0023] 10 Sewing machine 20 Upper sewing unit 21 First drive shaft 211 Cam part 212 First pulley 22 Link 221 First end 222 Second end 23 Needle bar 231 First stroke distance 232 Second stroke distance 24 Guide rail 25 Circular locus 26 Linear locus 27 Needle 30 Lower sewing unit 31 Second drive shaft 311 Fixed collar 312 Mounting bump 313 Second pulley 32 Transmission link set 321 First swing arm 322 Second swing arm 323 Rocker arm 324 Connecting rod 33 Lower hook drive shaft 331 Collar 332 Limit block 34 Lower hook 35 Guide part 351 Guide ring 352 Linear Rail 40 Housing 41 Space 42 Needle Plate 43 Belt 431 Tooth Portion
Claims
1. A sewing unit including a first drive shaft, a link connected to the first drive shaft, and a needle bar driven by the link, the link having a first end connected to the first drive shaft and moving in a circular locus according to the first drive shaft, and a second end connected to the needle bar and operating within a guide rail, the second end moving in a linear locus, the linear locus having no overlapping portion with the circular locus, and a height of the linear locus being higher than a height of the circular locus. A lower sewing unit including a second drive shaft in an interlocking relationship with the first drive shaft, a transmission link set connected to the second drive shaft, a lower hook drive shaft connected to the transmission link set, a lower hook provided on the lower hook drive shaft and operating together with a plurality of needles on the needle bar, and a guide component through which the lower hook drive shaft is drilled, the transmission link set including a first swing arm connected to the lower hook drive shaft, the guide component being formed as two guide rings provided separately and through which the lower hook drive shaft is drilled, the two guide rings restricting the lower hook drive shaft to be able to perform only a linear reciprocating motion. A sewing machine, characterized by comprising the above.
2. The sewing machine according to claim 1, characterized in that the sewing machine includes a housing, and the housing defines a space in which the lower hook is displaced in the linear reciprocating motion.
3. The sewing machine according to claim 2, characterized in that the guide component is formed as a linear rail located between the two guide rings, and the lower hook drive shaft includes a collar and a limiting block provided on the collar and operating within the linear rail.
4. The sewing machine according to claim 3, characterized in that the second drive shaft includes a fixed collar, and the guide component is formed with a mounting bump assembled to the fixed collar.
5. The sewing machine according to any one of claims 1 to 4, characterized in that the transmission link set includes a second swing arm connected to the second drive shaft, a rocker arm connected to the second swing arm, and a connecting rod connecting the rocker arm and the first swing arm.
6. The sewing machine according to any one of claims 1 to 4, characterized in that the arrangement direction of these needles on the needle bar is parallel to the lower hook and the lower hook drive shaft.
7. The sewing machine according to claim 6, characterized in that the first drive shaft includes a cam component for connecting the link, and the assembly position of the link on the cam component is offset from the axis of the cam component.
8. The sewing machine according to claim 6, characterized in that the sewing machine includes a belt for interlocking the first drive shaft and the second drive shaft, the first drive shaft includes a first pulley connected to the belt, and the second drive shaft includes a second pulley connected to the belt.