Method and tightening device for avoiding hanging chain in face operating means

摘要

A method of operating chain-driven face operating means in a troublefree manner by avoiding hanging chain by the state of the chain assembly being detected at the auxiliary drive and by the length of the face operating means being changed in accordance with the determined states via telescoping devices allocated to the face operating means, the chain states "tight chain", "optimum chain" and "hanging chain" being determined independently of the chain speed and the telescoping device being actuated, in the course of which the torque of the drives is controlled as a function of the chain state, and a tightening device for carrying out the method. <IMAGE>