Importance

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Abstract

An apparatus for measuring and controlling the amount of yarn withdrawn from the warp beam of a warp knitting machine is disclosed. A pressure roll engages the yarn wound on the warp beam. The pressure roll drives a second drive roll connected to a signal generator for generating signals representative of the speed of yarn withdrawn from the warp beam. The signals preferably are evenly spaced yarn length pulses representing a measure of the length of yarn withdrawn from the warp beam. The pulses are transmitted to a controller circuit which compares the generated pulses with a predetermined knitting machine operating standard and generates a control signal to the warp beam drive mechanism for controlling rotation of the warp beam. The drive roll preferably is manufactured with a wear-resistant surface and the diameter of the drive roll is dimensioned so that the evenly distributed yarn length pulses represent a yarn length corresponding to a fraction of a minimal racking movement of the yarn laying bars in the warp knitting machine.

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First Claim