Patent ID: 6334238
Filing Date: 2002-01-01
Classification: D01H

Abstract:
A method of operating a sliver draw unit of a spinning preparation machine; the draw unit includinga first and a second pair of draw rolls through which the sliver consecutively passes in a forward direction while the rolls rotate in a working direction; a first and a second electric motor drivingly connected to respective said first and second pairs of draw rolls; a respective incremental rotary displacement sensor connected to each electric motor; and an electronic control and regulating device connected to said first and second electric motors and said incremental rotary displacement sensors; said method comprising the steps of (a) applying, by the incremental rotary displacement sensors, signals to said electronic control and regulating device; (b) determining from said signals, by said electronic control and regulating device, at least one of the angular position and the rotary direction of at least one of said roll pairs during operation and during standstill; and (c) rotating at least one of said roll pairs into a predetermined angular position by controlling, by said electronic control and regulating device, at least one of said first and second motors.