Thread take-up mechanism for a sewing machine

Abstract

The utility model discloses a thread picking mechanism for sewing machine relates to sewing machine technical field, including thread picking lever, thread picking connecting rod and thread picking cam, one end of thread picking lever is fixedly connected with the connecting block, is equipped with the card hole on the connecting block, be provided with the sliding plate in thread picking connecting rod, the sliding plate sliding connection is in thread picking connecting rod, and the one end of sliding plate is through the one side of thread picking connecting rod to the outside of thread picking connecting rod, one end of sliding plate is fixedly connected with the L shaped clamping plate, the one end away from L shaped clamping plate of thread picking connecting rod is equipped with the sliding slot, the L shaped clamping plate sliding connection is in the sliding slot, the utility model discloses buckle type connection, when replacing thread picking lever, only need to pull out the sliding plate, can complete dismounting and installation in short time.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a thread take-up mechanism for a sewing machine. Background Technology

[0002] During the operation of a sewing machine, the thread take-up mechanism plays a crucial role. It is responsible for controlling the tension and amount of thread supplied during sewing to ensure sewing quality.

[0003] However, the existing thread take-up mechanisms used in sewing machines still have some drawbacks in actual use: after long-term use, key components such as the thread take-up lever and cam are prone to wear and tear, which can lead to a decrease in thread take-up accuracy and require regular replacement. However, traditional thread take-up levers and connecting rods are usually fixed with bolts or pins, requiring the use of professional tools such as wrenches for disassembly, and multiple parts need to be disassembled one by one. Replacing the thread take-up lever alone is too time-consuming and affects production efficiency. Moreover, the thread take-up mechanism interface sizes of different sewing machine models are different, making the parts non-interchangeable.

[0004] To address this problem, we designed a thread take-up mechanism for sewing machines. Utility Model Content

[0005] The purpose of this invention is to provide a thread take-up mechanism for a sewing machine to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a thread take-up mechanism for a sewing machine, including a thread take-up lever, a thread take-up connecting rod, and a thread take-up cam. One end of the thread take-up lever is fixedly connected to a connecting block, and the connecting block has a locking hole. A sliding plate is provided inside the thread take-up connecting rod, and the sliding plate is slidably connected inside the thread take-up connecting rod. One end of the sliding plate passes through one side of the thread take-up connecting rod to the outside of the thread take-up connecting rod. One end of the sliding plate is fixedly connected to an L-shaped locking plate. A sliding groove is provided at the end of the thread take-up connecting rod away from the L-shaped locking plate, and the L-shaped locking plate is slidably connected inside the sliding groove.

[0007] Furthermore, a slot is provided on one side of the line-lifting rod, the connecting block is engaged in the slot, and the L-shaped card is engaged in the hole.

[0008] Furthermore, a spring is fixedly connected between the inner wall of the slide and the L-shaped plate.

[0009] Furthermore, a thread-lifting cam is provided at the end of the thread-lifting linkage away from the thread-lifting rod, and the thread-lifting cam abuts against the thread-lifting linkage.

[0010] Furthermore, a drive shaft is inserted into the thread-picking cam, and an annular boss is fixedly connected to the drive shaft.

[0011] Furthermore, the drive shaft has a threaded line, and a nut is threaded onto the threaded line. The thread-taking cam is positioned between the annular boss and the nut.

[0012] Furthermore, a fixing ring is fixedly sleeved at the bottom of the line-fetching rod, and a rotating shaft is rotatably connected to the back of the fixing ring.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention employs a snap-fit ​​connection consisting of a connecting block, an L-shaped locking plate, and a spring. Replacing the thread take-up lever simply requires pulling the sliding plate outwards, allowing for quick disassembly and installation. This significantly improves efficiency compared to traditional bolt connections. Furthermore, the quick-release structure requires no specialized tools, and ordinary operators can perform maintenance after simple training. In continuous production of industrial sewing machines, worn thread take-up levers can be quickly replaced, preventing production line downtime due to maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the thread-taking mechanism of this utility model;

[0016] Figure 2 This is a schematic diagram of the connection structure between the line-lifting rod and the line-lifting connecting rod of this utility model;

[0017] Figure 3 This is a schematic diagram of the top cross-sectional structure of the line-flying rod of this utility model;

[0018] Figure 4 This is a schematic diagram of the installation structure of the thread-picking cam of this utility model.

[0019] In the diagram: 1. Thread take-up lever; 2. Thread take-up connecting rod; 3. Thread take-up cam; 4. Connecting block; 5. Locking hole; 6. Slide plate; 7. L-shaped locking plate; 8. Slide groove; 9. Locking groove; 10. Spring; 11. Drive shaft; 12. Annular boss; 13. Threaded wire; 14. Nut; 15. Retaining ring; 16. Rotating shaft. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 2 and Figure 3This utility model provides a technical solution: a thread take-up mechanism for a sewing machine, including a thread take-up lever 1, a thread take-up connecting rod 2, and a thread take-up cam 3. One end of the thread take-up lever 1 is fixedly connected to a connecting block 4, and a locking hole 5 is provided on the connecting block 4. A sliding plate 6 is provided inside the thread take-up connecting rod 2, and the sliding plate 6 is slidably connected inside the thread take-up connecting rod 2. One end of the sliding plate 6 passes through one side of the thread take-up connecting rod 2 to the outside of the thread take-up connecting rod 2. An L-shaped locking plate 7 is fixedly connected to one end of the sliding plate 6 inside the thread take-up connecting rod 2. A sliding groove 8 is provided at one end of the thread take-up connecting rod 2 away from the L-shaped locking plate 7, and the L-shaped locking plate 7 is slidably connected in the sliding groove 8. A locking slot 9 is provided on one side of the thread take-up connecting rod 2 perpendicular to the L-shaped locking plate 7. The connecting block 4 is locked in the locking slot 9, and the L-shaped locking plate 7 is locked in the locking hole 5. A spring 10 is fixedly connected between the inner wall of the sliding groove 8 and the L-shaped locking plate 7.

[0022] In practice, the take-up lever 1 is connected to the take-up connecting rod 2 via the connecting block 4. During connection, the connecting block 4 is inserted into the slot 9 of the take-up connecting rod 2, and at the same time, the L-shaped locking plate 7 is engaged in the locking hole 5 under the elastic force of the spring 10, achieving mechanical locking. During disassembly, pulling the slide plate 6 outward causes the L-shaped locking plate 7 to compress the spring 10 and disengage from the locking hole 5, allowing the take-up lever 1 to be pulled out laterally. No tools are required throughout the entire process.

[0023] See Figure 4 A thread-lifting cam 3 is provided at the end of the thread-lifting rod 2 away from the thread-lifting rod 1. The thread-lifting cam 3 abuts against the thread-lifting rod 2. A drive shaft 11 is inserted into the thread-lifting cam 3. An annular boss 12 is fixedly connected to the drive shaft 11. A threaded line 13 is provided on the drive shaft 11. A nut 14 is threadedly connected to the threaded line 13. The thread-lifting cam 3 is located between the annular boss 12 and the nut 14.

[0024] In practice, when the line-picking cam 3 is replaced, the old cam can be removed by loosening the nut 14, and the new cam can be installed and then tightened again. The axial positioning accuracy is ensured by using the annular boss 12 and the threaded wire 13.

[0025] See Figure 1 The bottom of the line-lifting rod 1 is fixedly fitted with a fixing ring 15, and the back of the fixing ring 15 is rotatably connected to a rotating shaft 16.

[0026] In practice, the bottom of the take-up lever 1 is hinged to the frame via a fixing ring 15 and a rotating shaft 16, serving as a swing fulcrum. When the take-up connecting rod 2 swings, it drives the take-up lever 1 to swing upward around the rotating shaft 16, tightening the thread and increasing the tension. The take-up connecting rod 2 then drives the take-up lever 1 to return to its original position downward, releasing the thread to replenish the amount of thread.

[0027] Working principle: The drive shaft 11 is driven to rotate by the sewing machine motor via a synchronous belt or gears. The threaded line 13 on its surface is used to mount and fix the take-up cam 3. The eccentric profile of the take-up cam 3 rotates with the drive shaft 11, generating periodic radial motion, which pushes the take-up lever 2 to swing. When the cam rotates, the convex part of the cam profile pushes the take-up lever 2 to swing outward, and the concave part of the cam profile allows the take-up lever 2 to return to its original position inward, completing one swing cycle.

[0028] When the take-up lever 1 or the take-up cam 3 is worn and needs to be replaced, the buckle can be unlocked by the slide plate 6, and the disassembly and installation can be completed in a short time without disassembling other parts; the old cam can be removed by loosening the nut 14, and the new cam can be installed and then locked again. The axial positioning accuracy is ensured by the annular boss 12 and the thread 13.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A thread take-up mechanism for a sewing machine, comprising a thread take-up lever (1), a thread take-up connecting rod (2), and a thread take-up cam (3), characterized in that, One end of the lifting rod (1) is fixedly connected to a connecting block (4), and the connecting block (4) has a locking hole (5). A sliding plate (6) is provided inside the lifting rod (2). The sliding plate (6) is slidably connected inside the lifting rod (2), and one end of the sliding plate (6) passes through one side of the lifting rod (2) to the outside of the lifting rod (2). One end of the sliding plate (6) is fixedly connected to an L-shaped locking plate (7). A sliding groove (8) is provided at the end of the lifting rod (2) away from the L-shaped locking plate (7). The L-shaped locking plate (7) is slidably connected inside the sliding groove (8).

2. The thread take-up mechanism for a sewing machine as described in claim 1, characterized in that: The line-picking rod (2) has a slot (9) on one side, the connecting block (4) is engaged in the slot (9), and the L-shaped card plate (7) is engaged in the card hole (5).

3. The thread take-up mechanism for a sewing machine as described in claim 2, characterized in that: A spring (10) is fixedly connected between the inner wall of the slide (8) and the L-shaped plate (7).

4. The thread take-up mechanism for a sewing machine as described in claim 3, characterized in that: The end of the line-lifting link (2) away from the line-lifting rod (1) is provided with a line-lifting cam (3), and the line-lifting cam (3) abuts against the line-lifting link (2).

5. The thread take-up mechanism for a sewing machine as described in claim 4, characterized in that: A drive shaft (11) is inserted into the thread-picking cam (3), and an annular boss (12) is fixedly connected to the drive shaft (11).

6. The thread take-up mechanism for a sewing machine as described in claim 5, characterized in that: The drive shaft (11) has a threaded line (13), and a nut (14) is threaded onto the threaded line (13). The thread-picking cam (3) is located between the annular boss (12) and the nut (14).

7. A thread take-up mechanism for a sewing machine as described in claim 6, characterized in that: The bottom of the thread-lifting rod (1) is fixedly fitted with a fixing ring (15), and the back of the fixing ring (15) is rotatably connected to a rotating shaft (16).

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