Regulated drawing frame

A system for leveling out mass variations in a fiber mass, said system comprising:

• a textile processing machine configured to supply the fiber mass with a supply device at a generally constant supply speed;
• a regulated drafting system disposed downstream from said processing machine, said drafting system comprising at least two sets of driven rolls defining a draft zone therebetween, at least one of said sets of rolls being regulated for varying the draft of said drafting system;
• a drive operatively coupled to said drafting rolls, said drive coordinated with said supply drive so as to drive said drafting rolls at a base rotational speed that is a relatively constant function of said supply speed;
• a control unit configured with said drive for adjusting the rotational speed of said regulated drafting rolls relative to said base rotational speed to change the draft of said drafting system;
• means operatively configured with said control unit to detect at least one regulating parameter acted upon by said drafting system;
• and
• wherein said control unit subsequently readjusts said base rotational speed as a function of the detected regulating parameter so as to maintain a desired differential between a rate of supply of fiber material from said textile processing machine and a rate of processing by said drafting system.