Draw frame is the best sliver
regularity. By the use of servo motor draft is controlled in drawing for
constant count. Controlling draft by servo motor of this program is called Auto
Levelling. Auto Levelling is done by two ways.
- Open Loop.
- Close Loop.
Open Loop: When action and sensor
senses the feed count on the feed material to changes the draft is know as open
loop.
Close Loop:
Sensor sense the delivery count and send this sense to feed in this process and
draft is changed accordingly is known as close loop.
