System for manufacturing wavy slub yarns

The present invention relates to the technical field of manufacture of slub yarns, in particular to a system for manufacturing wavy slub yarns, comprising two encoders for detecting a speed of a front roller of a spinning frame; the encoders are connected with a PLC (programmable logic controller) module, an output end of the PLC module is connected with a driver for driving a servo motor, the PLC module is connected with a touch liquid crystal display for human-machine interaction, the system also comprises a power module for powering electricity consuming modules, a speed signal of the front roller of the spinning frame that is detected with the two encoders is transmitted to the PLC module, the PLC module provides action instructions for the driver to drive the servo motor according to set program instructions, the front roller of the spinning frame operates at constant speed, the servo motor drives middle and rear rollers to feed yarns at increased speed, produced wavy slub yarns have slubs in slubs, and