Oblon, Spivak, McClelland, Maier & Neustadt
Yarn quality monitoring method and apparatus
 A method of monitoring yarn quality in a yarn texturing process comprises measuring the velocity of the travelling yarn at two locations and comparing the measured velocities. At a first location the yarn tension is sufficient to draw out the crimp and at a second location the tension is lower such that the crimp is developed. Apparatus for performing this method comprises a measuring device to measure the peripheral speed of a driving roller which is part of a nip-feed device serving to feed a crimped yarn at the first location from a false twist device to a second heater of a false twist texturing machine. At the second location between the second heater and a third feed device of the machine is a second velocity measuring device which comprises an inlet tube, an outlet tube and two discs of brass which form spaced measuring stations spaced by an insulating body. Signals proportional to the static electrical charge carried by the yarn as is passes through the measuring device are sent from the discs to an amplifier and calculating means, at which the speed of travel of the yarn between the discs is calculated. 
Rieter Scragg Limited
G B B
G01N B65H B65H
inventional additional inventional
David C.
Eaton