Movable shelf arrangement

A method for controlling the movement of a shelf arrangement comprising individual shelf members and flat, planar tracks connected to a floor and extending parallel to one another perpendicular to a longitudinal extension of said shelf members, a set of wheels connected to each one of said shelf members for moving said shelf members on said tracks, at least some of said wheels of said set of wheels being driven, a drive connected to each one of said driven wheels, a sensor arrangement connected to each one of said shelf members, a drive control unit connected to each one of said driven wheels, said method comprising the steps of:

• arranging the tracks flush with the floor to form a continuous surface with the floor;
• continuously monitoring the actual alignment and the actual lateral displacement of said wheels relative to an ideal line of movement with said sensor arrangement;
• comparing the actual alignment and the actual lateral displacement to a respective preset threshold value;
• correcting at least one of the actual alignment and the actual lateral displacement, when a deviation from the respective preset threshold value has been detected, by sending a corrective control signal to at least one of said drive control units, wherein correction is achieved by at least one of the steps of driving said drive wheels at different rpm and activating said drive wheels at different times.