Autoleveller Draw frame basics for spinning Technicians
DRAW FRAME AUTOLEVELLER Autoleveller is an additional device which is meant for correcting the linear density variations in the delivered sliver by changing either the main draft or break draft of the drafting system, according to the feed variation. There are two types of Autolevelling systems. They are ⦁ Open loop system Open loop system ⦁ closed loop system Closed loop system drawframe working principle Most of the drawframe autolevellers are open loop auto levellers. In open loop autolevellers , sensing is done at the feeding end and the correction is done by changing either a break draft or main draft of the drafting system. In closed loop system, sensing is at the delivery side and correction is done by changing either a break draft or main draft of the drafting system. Most of the earlier card autolevellers are closed loop autolevellers. But the latest cards have sensing at the feed rollers and as well as at the delivery calender...