Autoleveller draw frame having process feed back control system

An autoleveller draw frame for fibre structures, said draw frame being arranged after a plurality of successive textile machines in a fibre processing plant, for processing said fibre structures, said draw frame comprising:

• at least one draw zone;
• a controllable drive system for defining draft height of the fibre structures in said draw zone;
• a programmable control unit for controlling the drive system;
• at least one sensor for determining mass per unit of length of the fibre structures passing a measuring position;
• means for storing a signal defining the drafted fibre structures for a predetermined period of time, said signal being representative of information for affecting a quality parameter of the fibre structures;
• said means for storing said signal including a memory unit for storing said signal;
• and
• a process control computer, said process control computer also being utilized for recalling said signal stored in said memory unit for use in controlling a quality parameter of the fibre structures in said plurality of successive textile machines of said fibre processing plant.