Patent ID: 7581493

Claim:
A device for engaging and/or disengaging a roller with or from a first mating cylinder, with a second mating cylinder having a circumferential surface defining a second mating cylinder circumferential direction and defining a tangential direction to said circumferential direction, with which the roller is engaged, the device comprising: a feed unit, said roller being mounted on said feed unit; a basic unit connected to said roller via said feed unit, said basic unit guiding said roller together with said feed unit in a direction parallel to said tangential direction of said second mating cylinder such that said basic unit moves said roller from a first position to a second position, said roller continuously engaging the second mating cylinder when said basic unit moves said roller from said first position to said second position, said roller being in contact with the first mating cylinder and the second mating cylinder in said second position, said roller being in contact with the second mating cylinder when said roller is in said first position, said roller being at a spaced location from the first mating cylinder when said roller is in said first position, said feed unit being positioned in a bisecting line position with a rotational axis between the first mating cylinder and the second mating cylinder when said roller is in said second position, said feed unit generating engaging pressure with which said roller acts approximately uniformly on the first mating cylinder and the second mating cylinder when said feed unit is in said bisecting line position such that a nip ratio between the first mating cylinder and the second mating cylinder is substantially equal.