Device for operating a system for covering an opening and covering unit using such a device

A device for operating a system for blinding a window, that comprises at least one end mobile in translation between a retracted position and an extended position in which the system blinds at least in part the window, the operating device comprising:

• a flexible push belt that comprises a first and a second ends, which is intended to be connected to the mobile end of the blind system and which is adapted to transmit a pushing force to the mobile end of the blind system,
• motorized means for driving the push belt, adapted to translationally move the push belt between a proximal position corresponding to the retracted position of the blind system and a distal position corresponding to the extended position of the blind system,
• wherein it comprises two parallel tracks or slides, superimposed to each other or facing each other, in which the first and second ends of the push belt circulate, and in that the drive means comprise a drive and steering wheel around which the push belt is partially wound so that a portion of the push belt is located in the first slide and another portion is located in the second slide.