Patent ID: 6418705
Filing Date: 2002-07-16
Classification: D01H

Abstract:
A method of automatically parting a roving upon removal of a full roving bobbin from a roving flyer frame in which the roving bobbin is wound on a roving tube with upper and lower winding cones having a wound body between them as the tube is rotated and the roving is delivered by a flyer from a pressing finger bed of the flyer resting on a surface of the wound body of the bobbin, said method comprising the steps of:(a) generating at least half a turn of roving and a roving reserve on said tube above said upper winding cone by a forward rotation of the bobbin following completion of the bobbin and while retaining the roving with said pressing finger bed; (b) unwinding the roving reserve by a reverse rotation of said bobbin to form an unwound roving reserve consisting of three segments including: a first segment extending from an upper edge (A) of the upper winding cone to a location at a lower edge (B) of the upper winding cone, a second segment extending from the lower edge (B) of the upper winding cone to a location (C) at which the roving is to be weakened and located at a certain distance from said pressing finger bed, and a third segment extending from said location (C) to a first point (D) and corresponding in length to a desired length of roving remaining on said pressing finger after removal of the bobbin; (c) imparting twist to said unwound roving reserve by the reverse rotation of the bobbin whereby a number of twists per unit length is increased in said first segment and is reduced in said second and third segments and the roving is weakened at said location (C); (d) moving the pressing finger bed by a predetermined amount along a periphery of the bobbin from said first point (D) to another point (E) such that the distances (B-D) from the location at the lower edge (B) to the first point (D) and (B-E) the distance from the location at the lower edge (B) to the other point (E) are equal; and (e) pulling on said roving by movement of said pressing finger bed, thereby parting said roving at said location.