Especially suited for installing on a frame. For use with curtains 150 cm w max. and 250 cm h weight not more than 1.5 kg. The curtain is operated by means of a chain ring acting on tape winding spools allowing curtain raising or lowering. The tape winding spools are made so as to allow fast curtain removal. Stopping in any position is done using a special lateral stop. Installation, preferably on the frame or directly on the ceiling, is by click supports that facilitate track removal.