Thread cutting control method and mechanism of sewing machine and overedger

Abstract

The invention provides a thread cutting control method of a sewing machine. According to the thread cutting control method, a long thread end cutting mode, a short thread end cutting mode and a shortthread end cutting compensation mode are provided; in the long thread end cutting mode, when a detecting sensor detects that the edge of a sewing fabric passes, an electric control module starts timing, and thread cutting is conducted when a standard long thread end cutting time M preset in the electric control module arrives; in the short thread end cutting mode, when the detecting sensor detectsthat the edge of the sewing fabric passes, thread cutting is conducted instantly; in the short thread end cutting compensation mode, the electric control module compensates for the standard short thread end cutting time T into an actual short thread end cutting time X according to current sewing parameters of the sewing machine; when the detecting sensor detects that the edge of the sewing fabricpasses, the electric control module starts timing, and when the actual short thread end cutting time X arrives, thread cutting is conducted. By the adoption of the thread cutting control method of the sewing machine, the effects of long thread end cutting and short thread end cutting can be achieved, and requirements of multiple sewing technologies and specified sewing technologies are met.

Description

technical field [0001] The invention relates to a thread trimming control method of a sewing machine. [0002] The present invention also relates to a sewing machine thread trimming control mechanism for realizing the above sewing machine thread trimming control method. [0003] The present invention further relates to an overlock sewing machine including the thread trimming control mechanism of the sewing machine. Background technique [0004] At present, when the overlock sewing machine sews the sewing material, a front braid will be formed at the front edge of the sewing material, and a rear thread braid will be formed at the rear edge of the sewing material, which requires the overlock sewing machine to trim the front braid and Trim short braids at the end of sewing to improve sewing quality. The thread trimming mechanism used to trim the front braid and the rear braid in the existing computerized overlock sewing machine is divided into two types: side suction thread t...

AI Technical Summary

Problems solved by technology

The machete thread trimming needs to be equipped with a sensor. After the sewing material passes the position of the sensor, the electronic control timing of the overlock sewing machine reaches the preset time T and then controls the thread trimming drive source (such as an electromagnet or cylinder) to move to realize thread trimming; The structure of this kind of machete thread trimming can realize low cost, but it also has the following problems at the same time: it is affected by aspects such as the rotational speed of the motor during actual sewing, the sewing needle pitch, and the artificial operation gesture of the worker, so that the required thread trimming time is different from the preset time. If the setting time T is advanced or delayed, it will easily lead to unstable thread trimming length, and it is impossible to achieve the effect of low-cost short thread ends

[0005] In addition, the existing computerized overlock sewing machine has a single thread trimming mode, which can only achieve the trimming effect of short thread ends, and is unstable. However, some specific sewing processes require long thread ends, but do not need short thread ends. Therefore, the existing The thread trimming mode cannot meet the needs of the current specific sewing process

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