Method of bridging partial tightness on movable members

A method of bridging partial tightnesses of movable members which are received in guides and are driven by electric drive motors, comprising the steps of controlling drive motors with a monitoring function;

• providing an automatic monitoring function by automatically operating control;
• and varying a releasing force inside a tightness region in at least one step, wherein said automatically operating control includes a stepped increase of the releasing force by a first starting routine and a second starting routine, wherein the first starting routine results in a first clamping force increase upon encountering a tightness region, and wherein the second starting routine is performed with an increased value for a clamping force to be applied, wherein increase of the clamping force is restricted by a maximum clamping force to be exerted by the movable member on the tightness region, and wherein said monitoring function comprises a clamping parameter storage for storing forces encountered upon movement of the movable members in the first and second starting routines, wherein each of the first and second starting routines is provided with a test routine to detect a normal run or a clamping situation.