A sewing machine thread take-up lever and thread feeding device
By adjusting the positions of the left and right thread guide holes on the sewing machine's take-up lever, the difference in thread amount and tension between the left and right needles can be varied, solving the problems of arching and thread residue at the bottom of the fabric when sewing extremely thin fabrics with a coverstitch sewing machine, thus improving the adaptability of the sewing machine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG JACK SMART SEWING TECHNOLOGY CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-03
AI Technical Summary
The existing two-needle three-thread sewing process of coverstitch sewing machines is prone to problems when sewing extremely thin fabrics, such as the looper thread being tightened too much, causing the fabric to bulge or the needle thread to remain at the bottom of the fabric, which cannot meet the requirements of sewing thin materials.
Design a sewing machine thread take-up lever, including first and second thread guides. By adjusting the relative positions of the left and right thread guide holes, the difference in the amount of thread on the left and right sides and the tension can be varied. The thread take-up lever is detachably mounted and linked with the thread guide seat. Combined with an adjustable thread clamp and thread guide, the needle and thread feeding process is optimized.
It enables sewing of thin materials under conditions of low online tension and low thread output from the thread clamp, avoiding the phenomenon of fabric arching or needle thread remaining at the bottom of the fabric caused by excessive tightening of the looper thread, thus enhancing the adaptability of the sewing machine.
Smart Images
Figure CN224451075U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sewing equipment technology, and in particular to a sewing machine thread take-up lever and a sewing machine thread feeding device using the thread take-up lever. Background Technology
[0002] When using the current two-needle three-thread sewing process on a coverstitch sewing machine to sew certain extremely thin special fabrics, it is easy for the looper thread to become too tight during machine operation, causing the fabric to bunch up, or for the left and right needle threads to not be tightened properly and remain at the bottom of the fabric. This is because, in the existing two-needle three-thread sewing process of the coverstitch sewing machine, see... Figure 4 The left needle 1 and right needle 2 are set at different heights. When the needle clamp 3 descends to the point where the curved needle 4 disengages from the left needle 1 but not from the right needle 2, the left needle 1 continues to descend, consuming the amount of thread looped, while the right needle 2 continues to draw thread from the thread clamp 5 and the elastic deformation of the needle thread itself. Obviously, compared to the left needle 1, the right needle 2 draws more thread from the thread clamp 5 and has a larger amount of unconsumed thread. However, the amount of thread consumed on the fabric by both needles is the same. Therefore, during the sewing process, the right needle thread needs to rely on the needle thread elongation to provide more thread.
[0003] See Figure 4 In the sewing process of most fabrics, adjusting the positive pressure of the thread clamp 5 between the left and right needles can ensure an equal relationship between the amount of thread consumed and the amount of thread dispensed from the clamp. However, for thin fabrics with low thread consumption, adjusting the amount of thread dispensed from the clamp requires the needles to have high thread tension, and the thread tension of the right needle thread must be higher than that of the left needle thread. This results in the looped thread intertwined with the left and right needle threads being pulled too tight, causing the fabric to bunch up. On the other hand, reducing the positive pressure of the thread clamp 5 will increase the amount of thread dispensed from the clamp, while thin fabrics consume less thread, resulting in the needle thread remaining at the bottom of the fabric and not being able to be retrieved.
[0004] Therefore, see Figure 4 The only way to meet the requirements of sewing thin materials is to adjust the position of the thread take-up lever 6 when the thread tension is not high and the amount of thread coming out of the thread clamp is not large. Figure 1 However, the left thread guide hole a and right thread guide hole b on the take-up lever 6 of the current coverstitch sewing machine with two needles and three threads are in fixed relative positions, which results in a fixed difference in the amount of thread provided by the left and right needles, so it cannot adapt to the adjustment of the left and right thread tension of thin materials. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model provides a sewing machine take-up lever and thread feeding device with a variable difference in the amount of thread between the left and right needles.
[0006] The present invention adopts the following technical solution:
[0007] This utility model provides a sewing machine thread take-up lever, including a first thread take-up lever and a second thread take-up lever. The head end of the first thread take-up lever is bent to form a first thread take-up end, and a left thread pass-through hole is opened on the first thread take-up end. The head end of the second thread take-up lever is bent to form a second thread take-up end, and a right thread pass-through hole is opened on the second thread take-up end. The tail ends of the first thread take-up lever and the tail ends of the second thread take-up lever are movably connected. The first thread take-up end and the second thread take-up end are arranged facing each other, and the position of the left thread pass-through hole can be adjusted relative to the right thread pass-through hole.
[0008] Preferably, the head end of the first threading rod is bent vertically to form a first thread-taking end, the head end of the second threading rod is bent vertically to form a second thread-taking end, and the tail ends of the first threading rod and the tail ends of the second threading rod are movably connected in parallel.
[0009] Preferably, a threading piece is vertically fixed to the tail end of the second threading rod, and the threading piece has a left threading hole and a right threading hole.
[0010] Preferably, a conduit is installed inside the left wire hole, right wire hole, left wire threading hole, and right wire threading hole.
[0011] Preferably, the tail end of the first threading rod is provided with a plurality of through holes spaced apart, and the tail end of the second threading rod is provided with a strip-shaped slot, and a plurality of threaded parts pass through the strip-shaped slot and are screwed into the through holes one by one.
[0012] This utility model also provides a sewing machine thread feeding device, including a thread clamp, a thread guide plate, a thread guide seat, and a thread take-up lever. The thread take-up lever is any of the sewing machine thread take-up levers described above. The thread clamp, the thread guide plate, and the thread guide seat are all located on the front side of the sewing machine arm. The thread guide seat can swing up and down in conjunction with the drive shaft of the sewing machine. The thread take-up lever is detachably mounted on the thread guide seat. The two needle threads on the thread clamp pass through the left and right thread guide holes of the thread take-up lever, respectively, and are finally supplied to the left and right needles at the lower end of the sewing machine needle bar after passing through the thread guide plate.
[0013] Preferably, the thread clamp is provided with multiple thread clamps that can adjust the tension of the needle and thread.
[0014] Preferably, it also includes a mounting base disposed on the front side of the sewing machine arm. The mounting base is provided with multiple thread guides, each of which is movably connected to the mounting base in the vertical direction. Both the mounting base and the thread guides are provided with thread holes. The two needle threads on the thread clamp pass through the mounting base and the multiple thread guides in sequence before passing through the thread take-up lever.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] When in use, the sewing machine take-up lever of this utility model has two needle threads respectively passed through the left thread hole of the first thread take-up lever and the right thread hole of the second thread take-up lever. Therefore, by adjusting the relative positions of the left and right thread take-up holes, the difference in the amount of thread between the left and right needles can be varied, and the tension of the left and right needle threads can be adjusted. This meets the requirements for sewing thin materials when the thread tension is not high and the amount of thread coming out of the thread clamp is not high, avoiding the phenomenon that the looper thread is too tight, causing the fabric to arch or the left and right needle threads are not tight and remain at the bottom of the fabric.
[0017] The sewing machine thread feeding device of this utility model naturally possesses the aforementioned beneficial effects due to the use of the sewing machine thread take-up lever, which will not be elaborated further here. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the existing line-lifting rod.
[0019] Figure 2 This is a schematic diagram of the sewing machine take-up lever after the threaded parts have been removed, according to an embodiment of this utility model.
[0020] Figure 3 This is a schematic diagram of the structure of the sewing machine take-up lever after tightening the threaded part in an embodiment of this utility model.
[0021] Figure 4 This is a structural diagram of the thread feeding device of a sewing machine equipped with a thread take-up lever.
[0022] The reference numerals in the attached figures are explained as follows:
[0023] 1. Left needle; 7. Thread guide plate
[0024] 2. Right needle 8. Thread guide
[0025] 3. Needle clamp; 9. Mounting base
[0026] 4. Curved needle 10. Thread guide bar
[0027] 5. Wire clamp a. Left wire pass hole
[0028] 501, Wire clamp b, Right wire pass hole
[0029] 6. Threading rod c, left thread hole
[0030] 601, First threading rod d, Right threading hole
[0031] 602, Second threading rod e, Threading hole
[0032] 603, threading piece f, strip groove hole
[0033] 604, threaded parts g, wire holes Detailed Implementation
[0034] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.
[0035] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0037] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0038] See Figure 2 and Figure 3 This embodiment provides a sewing machine thread take-up lever, including a first thread take-up lever 601 and a second thread take-up lever 602. The head end of the first thread take-up lever 601 is bent to form a first thread take-up end, and a left thread pass-through hole a is provided on the first thread take-up end. The head end of the second thread take-up lever 602 is bent to form a second thread take-up end, and a right thread pass-through hole b is provided on the second thread take-up end. The tail ends of the first thread take-up lever 601 and the tail ends of the second thread take-up lever 602 are movably connected. The first thread take-up end and the second thread take-up end are arranged facing each other, and the left thread pass-through hole a can be adjusted in position relative to the right thread pass-through hole b.
[0039] In this embodiment, when the sewing machine take-up lever is in use, the two needle threads are respectively passed through the left thread hole a of the first threading lever 601 and the right thread hole b of the second threading lever 602. Therefore, by adjusting the relative positions of the left thread hole a and the right thread hole b, the difference in the amount of thread between the left and right needles can be changed, and the tension of the left and right needle threads can be adjusted. This satisfies the requirements for sewing thin materials when the thread tension is not high and the amount of thread coming out of the thread clamp is not high, and avoids the phenomenon that the looper thread is too tight, causing the fabric to arch or the left and right needle threads are not tight and remain at the bottom of the fabric.
[0040] Preferably, see Figure 2 and Figure 3 The first threading rod 601 has its head bent vertically to form a first thread take-up end, and the second threading rod 602 has its head bent vertically to form a second thread take-up end. The tail ends of the first threading rod 601 and the second threading rod 602 are connected in a parallel manner. In actual use, the two threads are passed through the left thread hole a and the right thread hole b, respectively. By making the tail ends of the first threading rod 601 and the second threading rod 602 parallel to each other, and by bending both the first and second thread take-up ends vertically, the tangling of the needle and thread can be avoided.
[0041] Preferably, see Figure 2 and Figure 3 The tail end of the second threading rod 602 is vertically fixed with a threading plate 603, which has a left threading hole c and a right threading hole d. In actual use, the two needles and threads first pass through the left threading hole c and the right threading hole d on the threading plate 603 respectively, and then enter the left threading hole a and the right threading hole b. This allows the threading plate 603 to regulate the movement path of the needles and threads, preventing the needles and threads from getting tangled.
[0042] Preferably, thread guide tubes are installed in the left thread guide hole a, right thread guide hole b, left thread guide hole c, and right thread guide hole d to reduce friction during needle and thread feeding.
[0043] Preferably, see Figure 2 and Figure 3 The first threading rod 601 has multiple through holes e spaced apart at its tail end, and the second threading rod 602 has a strip-shaped slot f at its tail end. Multiple threaded parts 604 pass through the strip-shaped slot f and are screwed into the through holes e one by one. When it is necessary to adjust the relative position of the left wire through hole a and the right wire through hole b, the threaded parts 604 are loosened and controlled to move into the appropriate position in the strip-shaped slot f before being tightened. This allows the adjustment of the positions of the first threading rod 601 and the second threading rod 602, and the relative position of the left wire through hole a and the right wire through hole b is also changed accordingly.
[0044] Better, see Figure 2 and Figure 3In this embodiment, the threaded part 604 is a screw, and there are two through holes e. The two screws pass through the strip-shaped slot hole f and are screwed into the two through holes e respectively.
[0045] Combination Figures 2 to 4 This embodiment also provides a sewing machine thread feeding device, including a thread clamp 5, a thread guide plate 7, a thread guide seat 8, and a thread take-up lever 6. The thread take-up lever 6 adopts the sewing machine thread take-up lever described above. The thread clamp 5, the thread guide plate 7, and the thread guide seat 8 are all located on the front side of the sewing machine arm (i.e., the side of the sewing machine arm facing the operator). The thread guide seat 8 can swing up and down in linkage with the drive shaft of the sewing machine. The thread take-up lever 6 is detachably mounted on the thread guide seat 8. The two needle threads on the thread clamp 5 pass through the left thread guide hole a and the right thread guide hole b of the thread take-up lever 6, respectively, and are finally supplied to the left needle 1 and the right needle 2 at the lower end of the sewing machine needle bar after passing through the thread guide plate 7.
[0046] When the drive spindle of the sewing machine is running, it can drive the thread guide 8 to swing up and down in conjunction, so that the take-up lever 6 and the thread guide 8 swing up and down synchronously, so as to properly control the feeding of the two needles and threads without applying slack or excessive tension to the two needles and threads.
[0047] Preferably, see Figure 4 The thread clamp 5 is equipped with multiple thread clamps 501 that can adjust the tension of the needle and thread.
[0048] Preferably, see Figure 4 The sewing machine thread feeding device in this embodiment also includes a mounting base 9 disposed on the front side of the sewing machine arm. The mounting base 9 has multiple thread guides 10, each of which is movably connected to the mounting base 9 in a vertical direction. Both the mounting base 9 and the thread guides 10 have thread holes g. The two needle threads on the thread clamp 5 pass through the mounting base 9 and the multiple thread guides 10 in sequence before entering the take-up lever 6. The mounting base 9 can regulate the movement path of the two needle threads led out from the thread clamp 5, while the multiple thread guides 10 can be adjusted to appropriately adjust the tension of the needle threads by adjusting their positions on the mounting base 9.
[0049] In summary, the sewing machine take-up lever and thread feeding device of this utility model have a simple structure and are easy to adjust. They can significantly improve the current shortcomings of limited adjustment range of left and right needle thread tension in coverstitch machines, and increase the adaptability of sewing.
[0050] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A sewing machine thread take-up lever, characterized in that, It includes a first threading rod (601) and a second threading rod (602). The head end of the first threading rod (601) is bent to form a first thread-taking end, and a left thread-passing hole (a) is provided on the first thread-taking end. The head end of the second threading rod (602) is bent to form a second thread-taking end, and a right thread-passing hole (b) is provided on the second thread-taking end. The tail end of the first threading rod (601) is movably connected to the tail end of the second threading rod (602). The first thread-taking end and the second thread-taking end are arranged facing each other, and the left thread-passing hole (a) can be adjusted in position relative to the right thread-passing hole (b).
2. The sewing machine thread picker bar according to claim 1, wherein, The head end of the first threading rod (601) is bent vertically to form a first thread take-up end, the head end of the second threading rod (602) is bent vertically to form a second thread take-up end, and the tail ends of the first threading rod (601) and the tail ends of the second threading rod (602) are movably connected in parallel.
3. The sewing machine thread picker bar according to claim 1, wherein, The tail end of the second threading rod (602) is vertically fixed with a threading piece (603), and the threading piece (603) has a left threading hole (c) and a right threading hole (d).
4. The sewing machine thread picker bar according to claim 3, wherein, Each of the left wire-passing hole (a), the right wire-passing hole (b), the left wire-passing hole (c), and the right wire-passing hole (d) is equipped with a wire-passing tube.
5. The sewing machine thread picker bar of claim 1 wherein, The tail end of the first threading rod (601) is provided with a plurality of through holes (e) spaced apart, and the tail end of the second threading rod (602) is provided with a strip-shaped slot (f). A plurality of threaded parts (604) pass through the strip-shaped slot (f) and are screwed into the through holes (e) one by one.
6. A thread feeding device for a sewing machine, characterized in that The sewing machine includes a thread clamp (5), a thread guide plate (7), a thread guide seat (8), and a thread take-up lever (6). The thread take-up lever (6) is the sewing machine thread take-up lever according to any one of claims 1-5. The thread clamp (5), the thread guide plate (7), and the thread guide seat (8) are all located on the front side of the sewing machine arm. The thread guide seat (8) can swing back and forth in conjunction with the drive shaft of the sewing machine. The thread take-up lever (6) is detachably mounted on the thread guide seat (8). The two needle threads on the thread clamp (5) pass through the left thread hole (a) and the right thread hole (b) of the thread take-up lever (6) respectively and are finally supplied to the left needle (1) and the right needle (2) at the lower end of the sewing machine needle bar through the thread guide plate (7).
7. The sewing machine thread feeder according to claim 6, wherein The thread clamp (5) is equipped with multiple thread clamps (501) that can adjust the tension of the needle and thread.
8. The sewing machine thread feeder of claim 6 wherein, It also includes a mounting base (9) set on the front side of the sewing machine arm. The mounting base (9) is provided with a plurality of thread guides (10). Each thread guide (10) is movably connected to the mounting base (9) in the vertical direction. Both the mounting base (9) and the thread guides (10) are provided with thread holes (g). The two needle threads on the thread clamp (5) pass through the mounting base (9) and the plurality of thread guides (10) in sequence and then pass through the thread take-up lever (6).