Abstract: Electromechanical or manually operable vertical-moving roller curtains for windows which consist of a curtain made of thin and flexible material, wrapped around a self-winding upper roller and a lower edge fastened to a rigid horizontal crossbar. The crossbar is connected by vertical worm screw linkages to sliders. The worm screws and sliders have a matching thread meshing for driving connection therebetween. A geared motor or a crank drives the worm screws through a drive shaft and through bevel gear pairs. A surrounding hollowed frame consists of vertical and horizontal section bars, connected by linkage so that when the motor or crank is driven a rotation is imparted to the worm screws which, via sliders, vertically move the lower edge of the curtain upwards or downwards, thereby winding and unwinding the curtain on the upper roller.