TODAY’S PATENT – DRAFT DEVICE

The DRAFT DEVICE was invented by Naritoshi Ota (Otsu) on the 18^th of July 2006 , bearing patent number US7076840B2.

The present invention relates to a draft device comprising a draft roller that feeds a bundle of fibers (also referred to as a sliver) while pulling the bundle (this operation is also referred to as “drafting”).First aspect of the present invention provides a draft device comprising a plurality of roller pairs that pull a bundle of fibers while feeding the bundle downstream, characterized in that gaps are provided at ends of roller constituting roller pair, which are passed through associated air currents resulting from rotation of the roller and form air passages in which said air currents act as air flows forming a prevention wall that hinders spread of the bundle of fibers fed while being drafted.

One of the objective of the present invention to provide a draft device DR including draft rollers which, when a draft device composed of a plurality of draft roller pairs is used, can reduce the adverse effect of associated air currents resulting from the rollers rotating at high speed while maintaining a gripping force and can effectively utilize the associated air currents to suppress the spread of a bundle of fibers L