Thread trimming method of sewing machine and sewing machine

Abstract

The invention relates to a thread trimming method of a sewing machine and the sewing machine, the thread trimming method has a bottom thread capturing function, and comprises the following steps: S1, before shearing, a second thread trimmer is separated from a first thread trimmer, and a first capturing part abuts against a second capturing part; s2, when thread trimming is started, a second thread trimming knife rotates towards the first thread trimming knife, a thread separating tip is inserted into an upper thread ring, a thread trimming hook hooks a bottom thread and a cloth thread line and extends into the position between a first catching part and a second catching part, and the second thread trimming knife continues to rotate; s3, when the second thread trimmer reaches the meshing position, the bottom thread and the cloth side thread are cut off, and the thread end of the bottom thread is located in a gap between the second thread trimmer and the first thread trimmer; s4, before the second thread trimmer retreats, the thread end of the bottom thread extends to form a radian section and is located at the first catching part; the thread end of the upper thread leaves the first catching part under the action of the tensile tension of the upper thread; and S5, the second thread trimmer rotates and retreats, the first catching part makes contact with the second catching part, the thread end of the bottom thread is caught, and the thread end of the upper thread is not caught.

Description

technical field [0001] The invention relates to the field of sewing equipment, in particular to a thread trimming mechanism of a sewing machine and the sewing machine. Background technique [0002] The existing locket sewing machine does not have the function of catching the bottom thread. After the thread trimming mechanism is trimmed, the position of the bottom thread end is not controlled. It may fall in any direction, and after the thread is trimmed, the thread end remaining on the right side of the needle The length is not stable. In this way, when sewing starts next time, there is a certain probability that the high-speed rotating hook leather tail hook will hit the end of the bottom thread, and its lodging direction becomes more unpredictable, resulting in a lower success rate of sewing with the bottom thread. In addition, when catching the bottom thread, it is easy to catch the end of the upper thread at the same time. After the thread trimming is completed, the upp...

AI Technical Summary

Problems solved by technology

In this way, when you start sewing next time, there is a certain probability that the high-speed rotating hook hook will hit the end of the bottom thread, and its lodging direction becomes more unpredictable, resulting in a lower success rate of sewing with the bottom thread

In addition, when catching the bottom thread, it is easy to catch the end of the upper thread at the same time, and the upper thread will be pulled when the fabric is removed after the thread trimming is completed, which will easily drive the bottom th

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