A seaming machine and method of reinforcing stitches thereof

Abstract

The application provides a binding machine and a method for reinforcing a stitch of the binding machine, the binding machine comprising a needle group, a curved needle, a thread hooking assembly, a first thread loosening assembly and a second thread loosening assembly; the needle group and the curved needle are matched to realize a first sewing action of the binding machine; the first thread loosening assembly is used for synchronously loosening all needle threads of the needle group; the needle group at least comprises a first needle and a second needle arranged in a vertical gradient, the needle head position of the second needle is lower than that of the first needle; the second thread loosening assembly is used for loosening the needle thread of the second needle; the thread hooking assembly is used for hooking the needle thread of the second needle to form a triangular thread loop together with the curved needle; the needle group, the curved needle and the thread hooking assembly are matched to realize a second sewing action of the binding machine; and the second sewing action is used for reinforcing the sewing stitch of the binding machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of binding sewing machine, in particular to a lock stitch method of binding sewing machine. BACKGROUND

[0002] The binding sewing machine is a special sewing machine, which stitches chain stitch, which is used for the rolled collar, rolled edge, folded edge, binding, splicing and trimming of knitted garments, and achieves special sewing effect which is difficult to be achieved by common binding sewing machine.

[0003] For the traditional chain stitch method, the binding sewing machine uses one thread to work. The fabric is pressed down by the presser foot on the metal plate under the needle. At the beginning of each needle, the needle passes a loop through the fabric. The gripper device moves synchronously with the needle, which will grab the loop before the needle is lifted. Once the needle is lifted away from the fabric, the drive dog moves the fabric forward. When the needle passes through the fabric again, the new loop passes through the middle of the previous loop. The gripper grabs the loop again and wraps it around the next loop. In this way, each loop is exactly fitted with the next loop. The main advantage of chain stitch is that it is very fast to sew. The formation process of three-thread or four-thread single cover chain stitch is as follows: two or three needles pass through the fabric, and the needle thread is introduced through the fabric; at this time, the hook shuttle with shuttle thread is inserted into the loop of all the needle threads, the needle rises, and the needle thread is wrapped around the hook shuttle (i.e. wrapped around the shuttle thread); then the feeding mechanism moves the fabric forward by a distance, the needle passes through the fabric again with the needle thread and wraps the needle thread into the loop of the hook shuttle; the hook shuttle retreats and wraps the shuttle thread around the needle (i.e. around the needle thread) and immediately moves forward again, bringing the shuttle thread into the loop of the needle thread; the needle rises again, and the needle thread is wrapped around the hook shuttle, and the feeding mechanism moves the fabric forward by a distance, and the needle bar thread and the cam thread are tightened, completing a single cover chain stitch. In this way, the loop is formed by repeating the cycle.

[0004] However, this chain stitch is not very firm, and once the thread on one side is loose, the entire seam will fall off. SUMMARY

[0005] The purpose of the present application is to provide a binding sewing machine and a method for reinforcing the stitch of the binding sewing machine, so as to solve the problem of the chain stitch of the common binding sewing machine being not firm.

[0006] To solve the above technical problems, the present application provides a binding machine, comprising: needle group, curved needle, thread hooking assembly, first thread loosening assembly and second thread loosening assembly; the needle group cooperates with the curved needle to realize the first sewing action of the binding machine; the first thread loosening assembly is used for synchronously loosening the thread of all needles of the needle group; the needle group at least comprises first needle and second needle arranged in vertical gradient, the needle head position of the second needle is lower than that of the first needle; the second thread loosening assembly is used for loosening the thread of the second needle; the thread hooking assembly is used for hooking the thread of the second needle to form a triangular thread loop with the curved needle; the needle group, curved needle and thread hooking assembly cooperate to realize the second sewing action of the binding machine.

[0007] Preferably, the thread hooking assembly is arranged below the sewing table of the binding machine and is located in the same horizontal plane as the curved needle.

[0008] Preferably, the thread hooking assembly hooks the thread of the second needle in the direction away from the curved needle.

[0009] Preferably, the binding machine further comprises needle spacing assembly used for adjusting the distance between the needles in the needle group.

[0010] Preferably, the needle spacing assembly comprises magnet, and the distance between the needles is adjusted by the magnetic force of the magnet.

[0011] To solve the above problems, the present application further provides a method for reinforcing sewing thread by using the above binding machine, the method comprising the following steps:

[0012] Firstly, the needle group of the binding machine cooperates with the curved needle to complete the first sewing action for the first time;

[0013] Secondly, the needle group of the binding machine cooperates with the curved needle to complete the first sewing action for the second time;

[0014] Then, the second thread loosening assembly is turned on, the needle group runs downward, the thread hooking assembly hooks the thread of the second needle to form a triangular thread loop between the curved needle of the binding machine and the thread hooking assembly;

[0015] Then, the needle group continues to descend, the second needle passes through the triangular thread loop, the curved needle moves away from the thread hooking assembly, when the needle descends to the lowest point, the thread on the thread hooking assembly naturally falls off and is sleeved on the needle.

[0016] Afterwards, the needle group is lifted up, and under the action of the needle group, the needle thread forms a thread loop;

[0017] Finally, the curved needle is inserted into the thread loop along the track, the needle group returns to the highest point, the lock stitch action is completed, and the steps of S1 are repeated until all the sewing actions are completed.

[0018] Preferably, the stitch obtained by the first sewing action is a chain stitch.

[0019] Preferably, the method further comprises a thread trimming action, which occurs after all the sewing actions are completed.

[0020] Optionally, the first sewing action is performed twice, and the second sewing action is performed once.

[0021] Optionally, the first sewing action is performed three times, and the second sewing action is performed once.

[0022] The reinforcing stitch of the binding machine and the method provided by the application can solve the problem of weak sewing stitch by adding the second sewing action in the sewing process. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figures 1 to 2 is a position diagram of a second thread loosening assembly, a thread hooking assembly, and a needle compacting assembly of the binding machine provided by the embodiment of the application;

[0024] Figure 3 is a structure diagram of the thread hooking assembly of the binding machine provided by the embodiment of the application;

[0025] Figure 4 is a structure diagram of the needle compacting assembly of the binding machine provided by the embodiment of the application;

[0026] Figure 5 is a working diagram of the thread hooking assembly of the binding machine provided by the embodiment of the application;

[0027] Figure 6 is a partial enlarged view of the thread hooking assembly of the binding machine provided by the embodiment of the application;

[0028] In the figure,

[0029] 100-needle group; 101-first needle; 102-second needle; 200-curved needle; 300-thread hooking assembly; 401-first thread loosening assembly; 402-second thread loosening assembly; 500-needle compacting assembly. DETAILED DESCRIPTION

[0030] The present application will be further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present application will be more apparent from the following description and claims. It should be noted that the accompanying drawings are in a very simplified form and are not drawn to precise scale, only for the purpose of facilitating, clarifying and assisting the description of the embodiments of the present application.

[0031] The inventor has found that the traditional binding machine sews a chain stitch, which is used for the rolled collar, rolled edge, folded edge, binding, splicing and trimming of knitted garments, and achieves special sewing effects that cannot be achieved by ordinary binding machines. However, the chain stitch sewn by the traditional binding machine will be loose if the two end knots are damaged.

[0032] The inventor has further found that if a knot is added during sewing, even if the two ends are loose, it will not cause the entire sewing line to be loose, ensuring the firmness of the sewing line.

[0033] Therefore, the core idea of the present application is to add a knot sewing action to the traditional chain sewing stitch, thereby ensuring the firmness of the sewing line.

[0034] Specifically, please refer to Figure 1 , which is a schematic diagram of an embodiment of the present application. As shown in Figure 1 , a binding machine comprises a needle group 100, a curved needle 200, a thread hooking assembly 300, a first thread loosening assembly 401 and a second thread loosening assembly 402; the needle group 100 and the curved needle 200 cooperate to realize a first sewing action of the binding machine; the first thread loosening assembly 401 is used to loosen all the needle threads of the needle group 100 synchronously; the needle group 100 comprises at least a first needle 101 and a second needle 102 arranged in a vertical gradient, the needle head position of the second needle 102 being lower than that of the first needle 101; the second thread loosening assembly 402 is used to loosen the needle thread of the second needle 102; the thread hooking assembly 300 is used to hook the needle thread of the second needle 102, so that the needle thread of the second needle 102 and the curved needle 200 form a triangular thread loop; the needle group 100, the curved needle 200 and the thread hooking assembly 300 cooperate to realize a second sewing action of the binding machine.

[0035] The skilled in the art should know that the binding machine provided by the present application additionally increases a thread loosening assembly, i.e. the second thread loosening assembly 402, compared with the traditional binding machine. The first thread loosening assembly 401 and the thread loosening assembly in the traditional binding machine are the same in position and function, and are used for synchronously loosening all needle threads of the needle group 100 of the binding machine. The second thread loosening assembly 402 is used for cooperating to complete the second sewing action, i.e. the action of tying a knot.

[0036] The needle group 100 and the curved needle 200 are the prior art of the traditional binding machine. The needle group 100 at least includes two vertically arranged needles (if the number of the needles is more than three, the needles are equidistantly arranged along the same plane), and the needles are gradiently arranged, including the first needle 101 with the needle head located at the upper side and the second needle 102 with the needle head located at the lower side. The needle group 100 and the curved needle 200 cooperate to wind and combine the needle threads and the curved needle thread.

[0037] In addition, for the traditional binding machine, the traditional binding machine completes a sewing action every time the needle group 100 completes one up-down movement. In the embodiment, the sewing action of the traditional binding machine is the first sewing action, and the stitch of the first sewing action is the chain stitch. Through the improvement of the present application, the binding machine provided by the present application can also perform the second sewing action, and the second sewing action is completed by the thread hooking assembly 300. The thread hooking assembly 300 is arranged below the sewing table of the binding machine and is located at the same horizontal plane as the curved needle 200. The thread hooking assembly 300 hooks the needle thread of the second needle 102 in the direction away from the curved needle 200 before the second needle 102 descends below the sewing table of the binding machine, so that the needle thread of the second needle 102 and the curved needle 200 form a triangular thread loop, so that the second needle 102 passes through the triangular thread loop, thereby forming a knot.

[0038] The present application also provides a needle closing assembly 500, as shown in the figure. Figure 4 The needle closing assembly 500 internally includes a magnet, which is used for adjusting the distance between the needles in the needle group, so as to make the sewing stitch more compact.

[0039] The present application also provides a method for reinforcing the sewing stitch of the binding machine, which comprises the following steps:

[0040] Firstly, the needle group 100 of the machine cooperates with the curved needle 200 to complete the first sewing action, which is the action of completing the basic chain stitch. The first sewing action starts from the highest point of the needle group 100 and ends at the lowest point of the needle group 100. The first sewing action is performed twice to ensure the reinforcement effect of the sewing stitch. Those skilled in the art should know that the first sewing action can be performed once or more than three times, and the number of the first sewing action can be changed according to the actual requirements, which are all within the protection scope of the present application.

[0041] Secondly, the second thread loosening assembly 402 is opened, and the needle group 100 runs downward. Before the second needle 102 drops below the sewing table of the machine, the thread hooking assembly 300 hooks the needle thread of the second needle 102, and the needle thread of the second needle 102 is wound on the curved needle 200. The hooking action of the thread hooking assembly 300 forms a triangular thread loop between the curved needle of the machine and the thread hooking assembly.

[0042] Then, the needle group 100 continues to drop, the second needle 102 passes through the triangular thread loop, and the curved needle 200 moves away from the thread hooking assembly 300. When the needle group 100 drops to the lowest point, the needle thread on the thread hooking assembly 300 naturally falls off and is sleeved on the needle. Compared with the ordinary chain stitch, the machine provided by the present application ties a knot in the needle thread of the second needle 102 and sleeves it on the second needle 102, so as to achieve the effect of reinforcing the stitch.

[0043] Then, the needle group 100 is lifted up as in the conventional machine. The needle thread of the needle group 100 is fixed on the fabric due to the resistance of the sewing fabric at one end of the part below the sewing table of the machine, and the needle thread of the needle group 100 moves upward due to the traction of the needle group at the other end of the part below the sewing table of the machine. The straight-line distance between the two ends of the same needle thread located in the part below the sewing table of the machine is reduced, and a thread loop is formed between the needle thread and the corresponding needle.

[0044] Then, the curved needle 200 penetrates into the thread loop according to the trajectory, the needle group 100 returns to the highest point, the lock stitch action ends, and the steps of S1 are repeated until all the sewing actions are completed.

[0045] Finally, the machine makes a thread cutting action to cut all the needle threads and curved needle threads, and the sewing is completed.

[0046] In conclusion, the binding machine and the reinforcing stitch method thereof can solve the problem of unfirm sewing stitch by adding the second sewing action in the sewing process.

[0047] The above description is only a description of the preferred embodiments of the present application, and is not any limitation on the scope of the present application. Any modification or change made by those skilled in the art according to the above disclosure is within the protection scope of the claims.

Claims

1. A flat seaming machine characterized by, The machine needle group, the curved needle, the thread hooking assembly, the first thread loosening assembly and the second thread loosening assembly; The machine needle group and the curved needle are matched to realize the first sewing action of the flat seaming machine; The first thread loosening assembly is used to loosen the threads of all the machine needles of the machine needle group synchronously; The machine needle group at least includes the first machine needle and the second machine needle arranged in vertical gradient, and the needle head position of the second machine needle is lower than that of the first machine needle; The second thread loosening assembly is used to loosen the thread of the second machine needle; The thread hooking assembly is used to hook the thread of the second machine needle to form a triangular thread loop with the curved needle; The machine needle group, the curved needle and the thread hooking assembly are matched to realize the second sewing action of the flat seaming machine; The second sewing action is used to reinforce the sewing stitches of the flat seaming machine.

2. The machine of claim 1, wherein, The thread hooking assembly is arranged below the sewing table of the flat seaming machine and is located at the same horizontal plane as the curved needle.

3. The machine of claim 2, wherein, The thread hooking assembly hooks the thread of the second machine needle in the direction away from the curved needle.

4. The machine of claim 1 wherein, The needle spacing assembly is further included, which is used to adjust the distance between the machine needles in the machine needle group.

5. The machine of claim 4 wherein, The needle spacing assembly includes a magnet, and the distance between the machine needles is adjusted by the magnetic force of the magnet.

6. A method of reinforcing a sewn seam using the seaming machine of claim 1, wherein, The method includes the following steps: S1: the machine needle group and the curved needle of the flat seaming machine are matched to complete the first first sewing action; S2: the machine needle group and the curved needle of the flat seaming machine are matched to complete the second first sewing action; S3: the second thread loosening assembly is turned on, the machine needle group runs downward, the thread hooking assembly hooks the thread of the second machine needle to form a triangular thread loop between the curved needle of the flat seaming machine and the thread hooking assembly; S4: the machine needle group continues to descend, the second machine needle passes through the triangular thread loop, the curved needle moves away from the thread hooking assembly, and when the machine needle descends to the lowest point, the second machine needle thread hooked on the thread hooking assembly naturally falls off and is sleeved on the second machine needle; S5: the machine needle group is lifted upward, and under the sewing action of the machine needle group, the threads of all the machine needles form a thread loop; S6: the curved needle passes through the thread loop according to the track, the machine needle group returns to the highest point, the lock stitch action ends, and the step S1 is repeated until all the sewing actions are completed.

7. The method of reinforcing topstitching of a binding machine as defined in claim 6, wherein, The stitch obtained by the first sewing action is a chain stitch.

8. The method of reinforcing topstitching of a binding machine as defined in claim 6, wherein, A thread cutting action is further included, which occurs after all the sewing actions are completed.

9. The method of reinforcing topstitching of a binding machine as defined in claim 6, wherein, The first sewing action is performed twice, and the second sewing action is performed once.

10. The method of reinforcing a topstitch of a binding machine as defined in claim 9, wherein, The first sewing action is performed three times, and the second sewing action is performed once.

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