Thread cutting device for sewing machine

Abstract

The thread cutting device for the sewing machine comprises a sewing machine frame, a sewing machine head and a connecting column, the sewing machine head is installed above the sewing machine frame, the connecting column is connected to the lower portion of the end of the sewing machine head, a presser foot is fixedly connected to the lower portion of the connecting column, and a driving mechanism is installed in the presser foot through a bearing. The lower portion of the driving mechanism is sleeved with a driving gear, and the surface of the driving gear is meshed with a driven gear. The mounting bolt penetrates through the connecting strip to be in threaded connection with the presser foot, so that the connecting strip can conveniently drive the protective baffle to be clamped below the presser foot, the driving gear, the driven gear and the cut-off tool can be effectively and conveniently covered and protected integrally, damage caused by contact between fabric and the driving gear, the driven gear or the cut-off tool is avoided, and the service life of the cut-off tool is prolonged. And meanwhile, the use danger can be reduced, and the effect of assisting installation of the protective baffle can be achieved through mutual attraction of a third magnetic block and a fourth magnetic block.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and in particular to a thread cutting device for sewing machines. Background Technology

[0002] A sewing machine is a mechanical device that uses sewing thread to create stitches on fabric, weaving or sewing together one or more layers of fabric, leather, or other materials. It can sew cotton, linen, silk, wool, synthetic fibers, as well as leather, plastic, paper, and other products. The stitches are neat and strong, and the efficiency is far superior to hand sewing. The stitches produced are neat, beautiful, flat, and strong. The sewing speed is fast, and it is easy to use.

[0003] For example, patent publication number CN219059345U discloses a short thread cutting device for a sewing machine. The device includes a sewing machine with a needle bar at the top and a needle head at the bottom. A fixing block is fixed to the outer wall of the needle bar. When the needle bar lowers the needle head, the presser foot presses down on the fabric, allowing the needle head to sew through the needle groove. After sewing, a rotary drive lever located at the top of the control panel is rotated. The rotation of the rotary drive lever drives the drive gear in the drive groove to rotate. The meshing of the drive gear and the driven gear drives the driven gear at the bottom. The cutting blade rotates along with the presser foot, which can spin-cut the thread end located in the drive groove. This not only achieves a precise cutting effect, but also prevents cutting failures and deviations in the cutting position even with a large workload. At the same time, the spin-cutting blade can get closer to the fabric, avoiding the unsightly appearance of long thread ends after cutting. However, the cutter is not protected below, which makes the fabric under the presser foot easily damaged by the rotation of the gears and the cutter blade during use, increasing the risk of use. Therefore, we propose a thread cutting device for sewing machines to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a thread-cutting device for sewing machines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A thread-cutting device for a sewing machine includes a sewing machine frame, a sewing machine head, and a connecting post. The sewing machine head is mounted on top of the sewing machine frame, and the connecting post is connected to the lower end of the sewing machine head. A presser foot is fixedly connected to the lower part of the connecting post, and a driving mechanism is mounted inside the presser foot via a bearing. A drive gear is sleeved below the driving mechanism, and a driven gear meshes with the surface of the drive gear. A cutting blade is fixedly connected to the surface of the driven gear. A protective mechanism is installed below the presser foot.

[0007] Preferably, a groove is provided below the presser foot, and a fourth magnetic block is glued into the groove.

[0008] Preferably, the driving mechanism includes a driving shaft, the driving shaft is mounted inside the pressure foot via a bearing, and the surface of the driving shaft is provided with anti-slip texture.

[0009] Preferably, a first magnetic block is fixedly connected to the surface of the drive shaft, and a second magnetic block is glued to the upper surface of the presser foot, wherein the surface dimensions of the first magnetic block and the second magnetic block are compatible.

[0010] Preferably, the protective mechanism includes mounting bolts, a connecting strip is installed in the groove by the mounting bolts, and a protective baffle is fixedly connected to the end of the connecting strip.

[0011] Preferably, a plurality of third magnetic blocks are glued to the upper surface of the protective baffle.

[0012] Preferably, the shape of the groove is adapted to the surface dimensions of the connecting strip and the protective baffle, and the surfaces of the connecting strip and the protective baffle are at the same level as the bottom of the presser foot.

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

[0014] 1. This device is connected to the pressure foot by a bolt through the connecting strip. This allows the connecting strip to easily engage the protective baffle under the pressure foot, effectively covering and protecting the drive gear, driven gear, and cutting blade. This prevents the fabric from contacting the drive gear, driven gear, or cutting blade and causing damage, while also reducing the risk of use. Furthermore, the mutual attraction between the third and fourth magnetic blocks assists in the installation of the protective baffle.

[0015] 2. This device can drive the driven gear to rotate by rotating the shaft, which makes it easier for the cutting blade to cut the wire. When the shaft rotates, it can also drive the first magnetic block to rotate synchronously. When the first magnetic block and the second magnetic block are attracted to each other, the cutting blade can be limited when it is not in use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a thread-cutting device for a sewing machine proposed in this utility model;

[0017] Figure 2 for Figure 1 A magnified 3D schematic diagram of the structure at point A in the diagram;

[0018] Figure 3 for Figure 1 A three-dimensional bottom view of the presser foot and protective mechanism structure in the middle;

[0019] Figure 4 for Figure 1 An exploded 3D diagram of the connecting strip and protective baffle structure.

[0020] In the diagram: 1. Sewing machine frame; 2. Sewing machine head; 3. Connecting post; 4. Presser foot;

[0021] 5. Driving mechanism; 51. Driving shaft; 52. First magnetic block; 53. Second magnetic block;

[0022] 6. Driving gear; 7. Driven gear; 8. Cut-off blade;

[0023] 9. Protective mechanism; 91. Mounting bolts; 92. Connecting strip; 93. Protective baffle; 94. Third magnetic block;

[0024] 10. The fourth magnetic block. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figure 1-4 A thread-cutting device for a sewing machine includes a sewing machine frame 1, a sewing machine head 2, and a connecting post 3. The sewing machine head 2 is mounted on the top of the sewing machine frame 1, and the connecting post 3 is connected to the lower end of the sewing machine head 2. A presser foot 4 is fixedly connected to the lower part of the connecting post 3, and a driving mechanism 5 is installed inside the presser foot 4 through a bearing. A drive gear 6 is sleeved below the drive mechanism 5, and a driven gear 7 meshes with the surface of the drive gear 6. A cutting blade 8 is fixedly connected to the surface of the driven gear 7. The drive gear 6 can drive the driven gear 7 to rotate the cutting blade 8, which facilitates the thread-cutting function. A protective mechanism 9 is installed below the presser foot 4.

[0027] Furthermore, refer to Figure 3 and Figure 4 It can be seen that a groove is provided below the presser foot 4, and a fourth magnetic block 10 is glued in the groove. The groove below the presser foot 4 facilitates the installation of the drive gear 6, the driven gear 7 and the cutting blade 8. At the same time, the fourth magnetic block 10 facilitates the installation of the limit protection mechanism 9.

[0028] Furthermore, refer to Figure 1 and Figure 2 It can be seen that the driving mechanism 5 includes a driving shaft 51. The driving shaft 51 is installed inside the pressure foot 4 through a bearing, and the surface of the driving shaft 51 is provided with anti-slip texture. The driving shaft 51 can easily drive the drive gear 6 to rotate. At the same time, the anti-slip texture on the surface of the driving shaft 51 can facilitate the gripping of the driving shaft 51.

[0029] Furthermore, refer to Figure 1 and Figure 2 It can be seen that a first magnetic block 52 is fixedly connected to the surface of the drive shaft 51, and a second magnetic block 53 is glued to the upper surface of the pressure foot 4. The surface dimensions of the first magnetic block 52 and the second magnetic block 53 are compatible. The first magnetic block 52 and the second magnetic block 53 attract each other, which can play the role of limiting the drive shaft 51.

[0030] Furthermore, refer to Figure 3 and Figure 4 It can be seen that the protective mechanism 9 includes mounting bolts 91, and a connecting strip 92 is installed in the groove by mounting bolts 91. A protective baffle 93 is fixedly connected to the end of the connecting strip 92. The mounting bolts 91 pass through the connecting strip 92 and are threadedly connected to the sewing machine frame 1, which facilitates the installation of the protective baffle 93.

[0031] Furthermore, refer to Figure 3 and Figure 4 It can be seen that multiple sets of third magnetic blocks 94 are glued to the upper surface of the protective baffle 93. The adsorption of the multiple sets of third magnetic blocks 94 with the fourth magnetic block 10 can play a role in assisting the installation of the protective baffle 93.

[0032] Furthermore, refer to Figure 3 and Figure 4 It can be seen that the shape of the groove is adapted to the surface size of the connecting strip 92 and the protective baffle 93, and the surfaces of the connecting strip 92 and the protective baffle 93 are at the same level as the bottom of the presser foot 4. By making the connecting strip 92, the protective baffle 93 and the bottom of the presser foot 4 at the same level, the presser foot 4 can easily squeeze the fabric.

[0033] Working principle: When this utility model is in use, when the sewing machine frame 1 is in use, according to the attached... Figure 1 Appendix Figure 2 Appendix Figure 3 and attached Figure 4 By placing the connecting strip 92 and the protective baffle 93 into the groove below the pressure foot 4, the third magnetic block 94 and the fourth magnetic block 10 can attract each other, which facilitates the installation of the protective baffle 93. At this time, the mounting bolt 91 is threaded through the connecting strip 92 and connected to the pressure foot 4, which can limit the installation of the connecting strip 92 and the protective baffle 93 below the pressure foot 4, protecting the driving gear 6, the driven gear 7 and the cutting blade 8. Thus, when the connecting column 3 is in use, the driving gear 6 can drive the driven gear 7 to rotate by rotating the shaft 51, which facilitates the cutting blade 8 to cut the wire. At the same time, when the cutting blade 8 is not in use, the first magnetic block 52 and the second magnetic block 53 can attract each other, which facilitates the limiting of the cutting blade 8.

[0034] The above is the complete working principle of this utility model.

[0035] In this utility model, the installation, connection or setting methods of all the components mentioned above are common mechanical methods, and the specific structure, model and coefficient index of all the components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be described in detail.

[0036] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

[0037] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside, and vertical and horizontal" in the terminology only represent the orientation of the term in its conventional use or are common names understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, numerals such as "first," "second," and "third" do not represent specific quantities or orders, but are only used to distinguish names. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A thread-cutting device for a sewing machine, comprising a sewing machine frame (1), a sewing machine head (2), and a connecting post (3), characterized in that, A sewing machine head (2) is installed on the top of the sewing machine frame (1), and a connecting post (3) is connected to the bottom of the end of the sewing machine head (2). A presser foot (4) is fixedly connected to the bottom of the connecting post (3), and a driving mechanism (5) is installed inside the presser foot (4) through a bearing. A drive gear (6) is sleeved on the bottom of the driving mechanism (5), and a driven gear (7) meshes with the surface of the drive gear (6). A cutter (8) is fixedly connected to the surface of the driven gear (7), and a protective mechanism (9) is installed below the presser foot (4).

2. The thread-cutting device for a sewing machine according to claim 1, characterized in that, A groove is provided below the presser foot (4), and a fourth magnetic block (10) is glued into the groove.

3. The thread-cutting device for a sewing machine according to claim 1, characterized in that, The driving mechanism (5) includes a driving shaft (51). The driving shaft (51) is installed inside the press foot (4) through a bearing, and the surface of the driving shaft (51) is provided with anti-slip texture.

4. A thread-cutting device for a sewing machine according to claim 3, characterized in that, A first magnetic block (52) is fixedly connected to the surface of the drive shaft (51), and a second magnetic block (53) is glued to the upper surface of the pressure foot (4). The surface dimensions of the first magnetic block (52) and the second magnetic block (53) are compatible.

5. A thread-cutting device for a sewing machine according to claim 2, characterized in that, The protective mechanism (9) includes mounting bolts (91), and a connecting strip (92) is installed in the groove by the mounting bolts (91). A protective baffle (93) is fixedly connected to the end of the connecting strip (92).

6. A thread-cutting device for a sewing machine according to claim 5, characterized in that, Multiple sets of third magnetic blocks (94) are glued to the upper surface of the protective baffle (93).

7. A thread-cutting device for a sewing machine according to claim 5, characterized in that, The shape of the groove is adapted to the surface dimensions of the connecting strip (92) and the protective baffle (93), and the surfaces of the connecting strip (92) and the protective baffle (93) are at the same level as the bottom of the presser foot (4).

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