(57) Described herein is a roller screen device constituted by a fixed sectional element
(10) and a mobile sectional element (11) that is able to move parallel to the fixed
sectional element inside a frame contained in which is a screen (13), the mobile sectional
element (11) bearing a roller (12) inside it, wound on which is the screen (13), which,
at the other end, is anchored to the fixed sectional element (10). Guide elements
(14 and 24) for guiding the mobile sectional element (11) are positioned at the top
and at the bottom of the screen (13) and fixed at one end of their own to the mobile
sectional element (11), whilst the other ends of the guide elements (14) slide into
the fixed sectional element (10). Moreover provided is a system for tensioning the
guides (14 and 24), which acts during the steps of opening and closing of the screen
(13). The tensioning system consists of a thread (20), which extends starting from
the end (21) of the top guide (14) that slides in the fixed sectional element (10)
towards and around a bottom roller (22) and from here to the end (23) of the bottom
guide (24), which slides in the fixed sectional element (10), to proceed to and around
a top roller (25) and from here to the end (21) of the top guide (14) so closing to
form a loop.
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