Actuators are used to adjust a contact pressure exerted by a roller on an adjacent rotating body in a roller strip, or for arranging the roller on the rotating body or for separating the roller from the adjacent rotating body. The roller has ends that are mounted in a roller lock which includes several of these actuators. The actuators are supplied with a fluid under pressure, with a pressure level that can be controlled. The actuators, and preferably also the roller lock, have an identification characteristic such that for a selected roller lock, the contact pressure of a control unit, which can be actuated remotely, and which is exerted by the roller on the adjacent rotating body, can be adjusted by the actuators in response to the pressure level supplied to these actuators.