A control system and method for an automatic reverse sewing device of a sewing machine

Abstract

The invention provides an automatic reverse stitching device control system and method for a sewing machine, belongs to the technical field of sewing machines and solves the problems of low success rate of existing thread end overlocking and poor attractiveness. The automatic reverse stitching device control system for the sewing machine comprises a stitching structure, a driving motor module, an electric control unit, an inductive detection group and a sewing assisting device group, wherein at least one group of preset values are set on the electric control unit in advance, and when the actual turning angle value of a driving motor and an actual induction value of the corresponding cloth position are identical to a group of preset values, the electric control unit outputs corresponding control signals to control starting or stopping of one sewing assisting device corresponding to the group of preset values. The automatic reverse stitching device control system for the sewing machine has the advantages that the judgement result is more accurate, the success rate of thread end overlocking is higher and overlocked stitches are more attractive.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and relates to a control system and method for an automatic reverse sewing device of a sewing machine. Background technique [0002] There are some problems with the sewing machines currently in use. After sewing a piece of fabric, there will be a braid left in front of the starting point of the seam. If the length of the braid is too long, it is not beautiful; if the length is too short, the braid is easy to loose and affect the quality of the product. In order to solve this problem, there is a manual way to pull the wire braid back into the guide groove of the needle plate, and this section of the old wire braid will be wrapped into the new wire braid during the next work, but this solution is inefficient and Increase labor intensity. [0003] In order to reduce the labor intensity of the manual method and improve work efficiency, the Chinese patent (publication number: CN103966778A) ...

AI Technical Summary

Problems solved by technology

However, this program only detects the rotational speed, angular position (ie, rotation angle) and rotational angular displacement (ie, the number of turns) of the servo motor (that is, the motor), and uses this as a basis to start the corresponding device to realize reverse sewing. The problem is: only a single motor feedback, because a single motor feedback is easy to cause errors, so the control accuracy is not high, so the wrapped thread ends are not beautiful

Images