Patent ID: 8172171

Claim:
An adjustable doff core device for installation in the hollow center of a center-pull doff, comprising: a tubular core having a central longitudinal axis and a predetermined standard internal diameter; an adjustable outer press bar portion spaced outwardly from the tubular core and movable between an inward, contracted position and outer, expanded positions to define an adjustable outer diameter of the device, the outer press bar portion configured for substantially non-slip engagement with an inner diameter of a hollow center-pull doff; an adjustment mechanism between the tubular core and press bar portion configured to control expansion and contraction of the press bar portion in order to adjust the outer diameter of the device; and a locking device configured to releasably lock the press bar portion in a selected adjusted position, wherein the tubular core has an outwardly projecting annular shoulder located between opposite ends of the core, and the outer press bar portion comprises a plurality of elongate press bars extending parallel to the central longitudinal axis of the core and adjustably mounted on the tubular core for movement in radially inward and outward directions relative to the core, each press bar having a U-shaped cross section extending its entire longitudinal length and an inwardly facing slot, the outwardly projecting annular shoulder having a longitudinal length and the inwardly facing slot having a longitudinal length substantially the same as the longitudinal length of the annular shoulder so that the inwardly facing slot engages over the annular shoulder to guide the inward and outward movement of the respective press bar, whereby said press bars are at least substantially in parallel throughout the inward and outward movement.