Patent ID: 7261252

Claim:
An apparatus for winding at least one web on a winding roll, comprising at least a first roll, a second roll and a third roll parallel to one another and to said winding roll, said winding roll and said first, second and third rolls having each an axis and said apparatus having a nominal winding position in which: said first and second rolls and said winding roll are each in contact with said third roll; there is no contact between said first roll and said second roll, between said first roll and said winding roll and between said second roll and said winding roll; a first angle defined between a first half-plane delimited by the axis of said third roll and comprising the axis of said first roll and a second half-plane delimited by the axis of said third roll and comprising the axis of said second roll is smaller than 180°; a second angle defined between a third half-plane delimited by the axis of said third roll and comprising the axis of said winding roll and a fourth half-plane delimited by the axis of said third roll and comprising an intersection line is greater than 90°, said intersection line being defined as the intersection between the bisector plane of said first angle and the plane comprising the axis of said first roll and the axis of said second roll; wherein said apparatus further comprises means for applying bending moments to said third roll, said means for applying bending moments comprising a shaft mounted into said third roll and connected via a ball-joint to the roll support supporting said third roll, said shaft being further connected to a lever, said lever being actuated by a piston, whereby said piston displaces said lever at one end, resulting in said lever transmitting a bending moment to said shaft and said third roll in which said shaft is mounted.