Patent ID: 7246764

Claim:
A cross-wound bobbin comprising: a bobbin core and a cheese cone which is made up of yarn that is applied in layers to the bobbin core with successive layers having increased outward radial positioning from the core, said cheese cone having an unwinding end from which the yarn can be drawn off overend from an unwinding point and an opposite bottom end, said yarn in one of said layers in the cheese cone extending along a first helical line from the unwinding end of the cheese cone to the bottom end of the cheese cone and in an adjacent layer in said cheese cone extending in a second helical line in the opposite winding direction from the bottom end of the cheese cone to the unwinding end of the cheese cone, said first and second helical lines having different pitches relative to a plane perpendicular to an axis of the bobbin core such that in at least one region of the cheese cone the yarn length being unwound is greater if the unwinding point of the yarn on the outside of the cheese cone has moved from the unwinding end of the cheese cone to the bottom end of the cheese cone relative to the yarn length that is drawn off in said at least one region of the cheese cone if the unwinding point of the yarn has moved from the bottom end of the cheese cone to the unwinding end of the cheese cone wherein the relationship of the number of windings in which the yarn is unwound along the way from the bottom end to the unwinding end to the number of windings the yarn is unwound in the reverse direction from the unwinding end to the bottom end defines a winding ratio, and the winding ratios of first and second helical lines of adjacent layers vary in relation to the radial positioning of the layers with respect to the bobbin core.