AUTOMATIC YARN FEED RATE CONTROL SYSTEM FOR WARP BEAM KNITTING MACHINES

摘要

An automatic yarn feed rate control system for a warp beam knitting machine. The system comprises a digital pulse generator, a pulse multiplier, and a runner length multiplier coupled in series to the knitting machine crankshaft, for generating a digital pulse train, the number of pulses of which is proportional to the knitting machine knitting speed and the length of yarn consumed by the knitting machine during a predetermined knitting cycle. A plurality of interconnected counters adjusts the number of pulses of this pulse train to produce another pulse train, the number of pulses of which is inversely proportional to the instantaneous diameter of the knitting warp. The pulses of this latter pulse train are transmitted to a multivibrator and amplifier and drive a stepper motor which rotates the warp beam of the knitting machine at a speed which is inversely proportional to the warp diameter to maintain a constant yarn feed rate.