Patent ID: 7810543

Claim:
A roller screen device comprising: a fixed sectional element; a mobile sectional element configured to move parallel to the fixed sectional element inside a frame; a roller inside the mobile sectional element; a screen wound at a first end around the roller and anchored at a second end to the fixed sectional element; guide elements, forming a top guide and a bottom guide for guiding the mobile sectional element, positioned at the top and at the bottom of the screen and both said top and bottom guides fixed at a respective first end to the mobile sectional element, wherein second ends of the top and bottom guides slide into the fixed sectional element; a system for tensioning the top guide and the bottom guide during the steps of opening and closing of the screen, wherein the tensioning system includes a thread, which extends starting from the second end of the top guide that slides in the fixed sectional element towards and around a bottom roller and further extends to the second end of the bottom guide, which slides in the fixed sectional element, to proceed to and around a top roller and to the second end of the top guide, said thread closing to form a loop, the top guide and the bottom guide being sized to slide inside one another in the fixed sectional element.