Automatic changing device for machine sewing threads

Abstract

The invention provides a machine sewing thread automatic changing device, which relates to the technical field of sewing thread hook devices, and comprises an automatic thread hook assembly, and the automatic thread hook assembly comprises a thread hook driven by a power part; the thread hook is provided with a hook capable of stretching back and forth and an elastic clamping piece attached to the hook, and a cutter is arranged between the hook and the elastic clamping piece; the power component drives the thread hook to move, so that the hook of the thread hook can be far away from or close to the presser foot position of the interlock machine; the elastic clamping piece assists the hook, so that the network cable is clamped between the elastic clamping piece and the hook when being pulled back; and the cutter is used for cutting off a mesh line connected with the sewing position of the sewing machine. The interlock machine has the beneficial effects that in the process of sewing operation of the interlock machine, the device can realize the conversion of a sewing thread between a'Hasu thread 'and a'double thread', so that the problem of thread breakage of the interlock machine possibly caused by adopting a'double thread 'mode when the interlock machine is empty is successfully avoided, and the continuity of the production process is powerfully guaranteed.

Description

Technical Field

[0001] This invention relates to the field of sewing thread hook devices, and in particular to an automatic sewing thread changing device. Background Technology

[0002] In the field of fashion design, "Hasselblad stitch" is a type of stitch commonly used in specific parts of garment construction, primarily for decorative or structural purposes. It consists of two parallel lines connected by a mesh thread that folds back and forth between them. When sewing garments, a sewing machine is typically used to create "Hasselblad stitches" on the fabric. A sewing machine can produce both "Hasselblad stitches" and simple two parallel lines, also known as "double stitches." Switching between "Hasselblad stitches" and "double stitches" requires changing parts such as the presser foot. Although these parts are replaceable, the sewing machine needs to be adjusted after each change. Improper adjustments can easily lead to skipped stitches and other sewing problems. Therefore, these adjustments require a high level of skill from the sewing machine operator.

[0003] However, when sewing "double lines", the sewing machine cannot run empty. Therefore, if the sewing machine is used to sew "double lines", the process of sewing multiple garments cannot be continuous, which is not conducive to the advancement of automated sewing.

[0004] In automated sewing processes, to achieve the goal of continuously sewing multiple garments, "Hasselblad thread" is often used. However, some garment designs require a "double-line" sewing effect instead of "Hasselblad thread." This presents a challenge: sewing machines cannot run empty during the sewing process, making it impossible to continuously sew multiple garments. Furthermore, "double-line" sewing can lead to thread fraying. Therefore, a significant gap exists between customer requirements and the automation capabilities of sewing machines, creating a major obstacle to the use and promotion of automated equipment. Summary of the Invention

[0005] This invention overcomes the shortcomings of existing technologies and provides an automatic thread switching device. During sewing operations, this device can flexibly switch between "Hasselblad thread" and "double thread," successfully avoiding the thread breakage problem that may occur when using the "double thread" mode during empty sewing runs. This measure effectively ensures the continuity of the production process, significantly improves production efficiency, and makes the entire production process smoother and more efficient.

[0006] To solve the above-mentioned technical problems, the invention is achieved through the following technical solution: An automatic thread changing device for sewing machines includes an automatic thread hook assembly, which includes a thread hook driven by a power unit. The thread hook is provided with a hook that can extend and retract back and forth and an elastic clip that fits against the hook. A cutter is provided between the hook and the elastic clip. The power unit drives the thread hook to move, so that the hook of the thread hook can move away from or closer to the presser foot of the sewing machine. The elastic clip assists the hook, so that when the mesh is pulled back, it is clamped between the elastic clip and the hook; the cutter is used to cut the mesh connected to the sewing position of the sewing machine.

[0007] Furthermore, the automatic hook assembly is located at the front end of the sewing machine head, and a loosening assembly is also provided at the wire clamp at the rear end of the sewing machine head. The loosening assembly includes a third power component, which drives the crossbar to move. The crossbar moves to loosen the network cable held by the wire clamp. After the network cable is loosened, the hook can hook the network cable and cut it.

[0008] Furthermore, the power component includes a first power component and a second power component; When the sewing machine switches from "Hasselblad thread" to "double thread", the first power unit is used to push the hook closer to the net thread, and the second power unit causes the hook to swing away from the sewing machine needle after it hooks the net thread, thereby stretching the net thread to cut it. When the sewing machine switches from "double-line" to "Hasselblad" stitches, the second power unit swings the hook toward the sewing needle, while the first power unit pushes the hook so that the end of the hook is close to the sewing needle.

[0009] Furthermore, the first power component is a pneumatic cylinder or an electric cylinder; the second power component is a pneumatic cylinder or an electric cylinder.

[0010] Furthermore, the first power component is connected to the hook seat, and the hook seat is connected to the front end of the sewing machine head of the sewing machine; The output end of the first power component is connected to the hook auxiliary seat; a rotating seat is rotatably connected to the middle of the hook auxiliary seat, and the second power component is connected to the end of the hook auxiliary seat away from the first power component; The output end of the second power component is connected to the rotary output connector, and the end of the rotary output connector is connected to the upper end of the rotary seat. The lower end of the rotating seat is connected to a swing seat, and the hook is connected to the swing seat.

[0011] Furthermore, the third power component is a cylinder or an electric cylinder.

[0012] Furthermore, the output end of the third power component is connected to a push rod, and the crossbar is perpendicularly inserted into the push rod.

[0013] Furthermore, the end of the crossbar away from the push rod is provided with a loop hook, which is used to hook and catch the network cable connected to the cable clamp.

[0014] Compared with existing technologies, the beneficial effects of the invention are: 1. During sewing, the stitching can be flexibly switched between "Hasselblad thread" and "double thread" to provide more possibilities for making different styles of clothing and enrich the sewing styles of clothing. During the transition stage of clothing sewing, by switching to "Hasselblad thread" mode at the beginning and end, the stitching of the sewing machine can be avoided from breaking when the sewing machine is empty, which is caused by "double thread" mode, thus ensuring production continuity and improving production efficiency.

[0015] 2. Loosen the network cable in advance to prevent the cable from springing back due to tension, ensuring stability during network cable switching, ensuring smooth switching, reducing manual intervention, and improving the degree of production automation. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and, together with the embodiments thereof, are used to explain the invention. They do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the device of this invention installed on the front of a car cover; Figure 2 This is a schematic diagram of the "Hasselblad line" stitch in an embodiment of the present invention; Figure 3 This is a schematic diagram of the automatic hook assembly and the loosening assembly according to an embodiment of the present invention; Figure 4 This is an exploded view of the automatic hook assembly according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the loose wire assembly structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the automatic hook assembly structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the loosening assembly and clamp structure according to an embodiment of the present invention.

[0017] In the diagram: 1. Automatic line hook assembly; 101. Line hook seat; 102. First power unit; 103. Line hook auxiliary seat; 104. Rotating seat; 105. Second power unit; 106. Rotary output connection seat; 107. Swing seat; 108. Line hook; 2. Line easing assembly; 201. Third power unit; 202. Push rod; 203. Crossbar; 2031. Hoop hook; 3. Line clamp; A. Double-track line; B. Net line. Detailed Implementation

[0018] The preferred embodiments of the invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the invention.

[0019] like Figures 1 to 7 As shown, an automatic thread changing device is used to switch the sewing thread between "Hasselblad thread" and "double thread" during sewing, thereby meeting diverse sewing needs and providing more possibilities for the production of different styles of clothing.

[0020] The system includes an automatic hook assembly 1, which includes a hook 108 driven by a power unit. The hook 108 is equipped with a retractable hook and an elastic clip that fits against the hook. A cutter is provided between the hook and the elastic clip. The power unit drives the hook 108 to move, allowing the hook of the hook 108 to move away from or towards the presser foot of the sewing machine. The mesh thread B is provided by a coil placed above the sewing machine head. After being pulled out from the coil, the mesh thread B passes through the thread clamp 3 and is then pulled to the thread end holder above the presser foot of the sewing machine. When the sewing machine is sewing, the sewing machine needle moves downward, causing the mesh thread B to pass downward through the garment and participate in the sewing. Since one end of the mesh thread B is fixed to the thread clamp 3 and the thread end holder, the position of the mesh thread B at this point is always fixed. Therefore, when the hook approaches this position above the presser foot of the sewing machine, the hook can accurately hook the mesh thread B.

[0021] The side of the elastic clip is tightly attached to the side of the hook, so that when the mesh line B is pulled back by the hook, it is clamped between the elastic clip and the hook, making it difficult for the mesh line B to fall off after the hook catches it. The cutter is used to cut the mesh line B connected to the sewing position of the sewing machine.

[0022] The power components include a first power component 102 and a second power component 105; the first power component 102 is a cylinder or an electric cylinder; the second power component 105 is a cylinder or an electric cylinder.

[0023] When the sewing machine switches from "Hasselblad thread" to "double thread", the first power unit 102 pushes the hook 108 closer to the mesh thread B. The hook 108, driven by the power unit, moves to the output of the mesh thread B. The hook of the hook 108 extends and hooks the mesh thread B that has not been sewn. When the hook retracts, the mesh thread B is clamped between the elastic clips of the hook. After the hook hooks the mesh thread B, the second power unit 105 causes the hook 108 to swing away from the sewing needle, thereby stretching the mesh thread B. At this time, the cutter extends and cuts the mesh thread, and the mesh thread B is cut off. At this time, the sewn stitch is "double thread".

[0024] When the sewing machine switches from double-line stitching to Hasselblad stitching, the second power unit 105 swings the hook 108 toward the sewing needle, and the first power unit 102 pushes the hook 108 so that the end of the hook is close to the sewing needle. As a result, when the sewing machine is sewing, the sewing needle is driven by the mesh thread B hooked by the hook to participate in the sewing, thus sewing out the Hasselblad stitch.

[0025] According to the process requirements, when the sewing of garments requires the use of "Hasselblad thread," the automatic thread hook assembly 1 does not need to operate. When the sewing of garments requires the use of "double thread," the beginning and end of the sewing of the garments need to switch to "Hasselblad thread" mode during the transition between the two garments. This results in a "double thread" sewing process. During the transition phase connecting the garments, the sewing machine needs to run empty, meaning only the thread is being woven without any fabric involved. If the sewing machine is still in a "double thread" mode at this time, the thread is prone to breakage. A broken thread requires stopping the machine and reconnecting the thread, thus affecting production efficiency. Using "Hasselblad thread" mode at the beginning and end of the sewing of garments ensures a stronger bond between the thread and the garment, preventing the thread from easily detaching from the garment.

[0026] The first power component 102 is connected to the hook seat 101, which is connected to the front end of the sewing machine head. The output end of the first power component 102 is connected to the hook auxiliary seat 103. A rotating seat 104 is rotatably connected to the middle of the hook auxiliary seat 103. The second power component 105 is connected to the end of the hook auxiliary seat 103 away from the first power component 102. The output end of the second power component 105 is connected to the rotating output connector 106, and the end of the rotating output connector 106 is connected to the upper end of the rotating seat 104. A swing seat 107 is connected to the lower end of the rotating seat 104, and the hook 108 is connected to the swing seat 107.

[0027] The automatic thread hook assembly 1 is located at the front end of the sewing machine head. A thread loosening assembly 2 is also provided at the thread clamp 3 at the rear end of the sewing machine head. The thread loosening assembly 2 includes a third power component 201, which drives a crossbar 203 to move. The crossbar 203 moves to loosen the net cable B held by the thread clamp 3. After the net cable B is loosened, the thread hook 108 can hook the net cable B and cut it. The third power component 201 is a cylinder or an electric cylinder. The output end of the third power component 201 is connected to a push rod 202. The crossbar 203 is perpendicularly inserted into the push rod 202. A loop hook 2031 is provided at the end of the crossbar 203 away from the push rod 202. The loop hook 2031 is used to hook the net cable B connected to the thread clamp 3, so that the net cable B will not fall off when the push rod 202 pushes it.

[0028] Because the sewing machine keeps the mesh thread B taut during the sewing process, if the slack cord assembly 2 doesn't loosen it beforehand, the hook of the hook 108 will catch the mesh thread B. Furthermore, at the moment the cutter cuts the mesh thread B, due to the tension, the mesh thread B will spring back to the clamp 3, requiring the machine to be stopped and the thread pulled. Therefore, the slack cord assembly 2 ensures the stability of the mesh thread B during switching, guaranteeing a smooth switching process and avoiding the need for manual intervention due to switching errors.

[0029] This conversion device can flexibly switch the sewing thread between "Hasselblad thread" and "double thread" during sewing, providing more possibilities for the production of different styles of clothing and enriching the sewing styles of clothing. During the transition stage of garment sewing, by switching to "Hasselblad thread" mode at the beginning and end, the thread breakage caused by "double thread" mode when the sewing machine is empty is avoided. It has pioneered the use of sewing machines for continuous sewing in automated sewing, realizing continuous production of automated equipment and improving production efficiency.

[0030] Loosen the network cable B in advance using the loosening component 2 to prevent the network cable from springing back due to tension, ensuring stability during network cable switching, ensuring smooth switching, reducing manual intervention, and improving the degree of production automation.

[0031] Finally, it should be noted that the above are merely preferred embodiments of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. An automatic stitch changing device, characterized in that, The system includes an automatic hook assembly (1), which includes a hook (108) driven by a power unit. The hook (108) is provided with a hook that can extend and retract back and forth and an elastic clip that fits against the hook. A cutter is provided between the hook and the elastic clip. The power unit drives the hook (108) to move, so that the hook of the hook (108) can move away from or closer to the presser foot of the machine. The elastic clip assists the hook so that when the network cable (B) is pulled back, it is clamped between the elastic clip and the hook; The cutter is used to cut the mesh thread (B) connected to the sewing position on the sewing machine.

2. The automatic stitch changing device according to claim 1, characterized in that, The automatic hook assembly (1) is located at the front end of the sewing machine head. A loosening assembly (2) is also provided at the wire clamp (3) at the rear end of the sewing machine head. The loosening assembly (2) includes a third power component (201). The third power component (201) drives the crossbar (203) to move. The crossbar (203) moves to loosen the net wire (B) held by the wire clamp (3). After the net wire (B) is loosened, the hook (108) can hook the net wire (B) and cut it.

3. The automatic stitch changing device according to claim 1, characterized in that, The power components include a first power component (102) and a second power component (105); When the sewing machine switches from "Hasselblad thread" to "double thread", the first power unit (102) pushes the hook (108) close to the net thread (B), and the second power unit (105) swings the hook (108) away from the sewing machine needle after the hook catches the net thread (B), thereby stretching the net thread (B) to cut the net thread; When the sewing machine switches from "double thread" to "Hasselblad thread", the second power unit (105) swings the hook (108) toward the sewing machine needle, and the first power unit (102) pushes the hook (108) so that the end of the hook is close to the sewing machine needle.

4. The automatic stitch changing device according to claim 3, characterized in that, The first power unit (102) is a cylinder or an electric cylinder; the second power unit (105) is a cylinder or an electric cylinder.

5. The automatic stitch changing device according to claim 4, characterized in that, The first power unit (102) is connected to the hook seat (101), and the hook seat (101) is connected to the front end of the sewing machine head of the sewing machine; The output end of the first power component (102) is connected to the hook auxiliary seat (103); the middle part of the hook auxiliary seat (103) is rotatably connected to the rotating seat (104), and the second power component (105) is connected to the end of the hook auxiliary seat (103) away from the first power component (102); The output end of the second power component (105) is connected to the rotary output connector (106), and the end of the rotary output connector (106) is connected to the upper end of the rotary seat (104); The lower end of the rotating seat (104) is connected to the swing seat (107), and the hook (108) is connected to the swing seat (107).

6. The automatic stitch changing device according to claim 2, characterized in that, The third power unit (201) is a cylinder or an electric cylinder.

7. The automatic stitch changing device according to any one of claims 6, characterized in that, The output end of the third power unit (201) is connected to the push rod (202), and the crossbar (203) is vertically inserted into the push rod (202).

8. The automatic stitch changing device according to claim 7, characterized in that, The crossbar (203) is provided with a loop hook (2031) at the end away from the push rod (202). The loop hook (2031) is used to hook the network cable (B) connected to the wire clamp (3).

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