A fully automatic control device and control method for a sewing machine mop wheel

Abstract

The invention discloses full-automatic control device and method of a cloth dragging wheel of a sewing machine. According to the scheme, the device is characterized in that a needle pitch adjusting variable is converted into electricity parameters of a stepping motor driving device of a cloth dragging wheel through a mechanical transmission mechanism, so as to control the rotating variable of the stepping motor of the cloth dragging wheel while sewing at each needle pitch, and the feeding speed of the stepping motor of the cloth dragging wheel changes synchronous with the sewing speed of a main shaft motor of the sewing machine; a detecting signal of sewing material is detected based on a photoelectric switch to control the cloth dragging wheel to raise or lower down; a backstitch detecting signal of a backstitch detecting switch is utilized to control the cloth dragging wheel to positively feed or reversely feed materials. According to the scheme, the device is simple in structure and convenient to operate; the cloth dragging wheel can be synchronous with the needle pitch adjusting, back stitching and sewing speed of the sewing machine, thus the full-automatic control of the cloth dragging wheel of the sewing machine can be effectively achieved, and as a result, the sewing quality, the working efficiency is increased, the labor intensity of operators can be decreased, and the sewing cost can be reduced.

Description

technical field [0001] The invention relates to sewing machine technology, in particular to a control technology of a sewing machine drag wheel. Background technique [0002] At present, there are two control methods for the mop wheel of the sewing machine, which are mechanical control and electric control control. The above two control methods need to lift the mop wheel when the sewing machine performs reverse sewing, and then cancel the normal operation. In addition, when the sewing needle pitch changes, it is necessary to manually reset the electrical parameters of the rotation of the auxiliary feeding mop wheel, so that the material can be roughly synchronized with the feeding mechanism, and the feeding speed of the auxiliary feeding mop wheel can only be matched with the sewing machine. The speed is kept within a certain range of synchronization. In order to realize such control, the structure of the control mechanism of the mop wheel is complicated, and the whole is a...

AI Technical Summary

Problems solved by technology

In order to realize such control, the structure of the control mechanism of the mop wheel is complicated, and the whole is a semi-automatic control mode, which is inconvenient to operate, laborious and laborious, and has obvious limitations, which greatly limits the work efficiency of the operator; moreover, because the mop wheel and Accurate synchronization cannot be achieved among the sewing machine needle pitch adjustment mechanism, reverse stitching action and sewing speed, which affects the sewing quality

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