Apparatus for opening and cleaning fiber material

In an apparatus for opening and cleaning fiber material, including consecutively arranged first, second and third clothed rolls each having a clothing thereon;

• said second clothed roll cooperating with said first clothed roll as a doffer and opening roll and said third clothed roll cooperating with said second clothed roll as a doffer and opening roll;
• further wherein centrifugal forces generated at peripheries of said clothed rolls increase from roll to roll from the first clothed roll;
• fiber feeding means for advancing the fiber material towards said first clothed roll;
• and covers each closely surrounding the respective said first, second and third clothed rolls;
• the improvement wherein said first, second and third clothed rolls have at least approximately identical diameters;
• the improvement further comprising a waste discharge opening provided in the cover of each clothed roll;
• a mote knife bounding each waste discharge opening;
• and an additional clothed roll situated between said fiber feeding means and said first clothed roll;
• said additional clothed roll having a clothing formed of pins or needles;
• said additional clothed roll being arranged for receiving the fiber material from said fiber feeding means and for transferring the fiber material to said first clothed roll.