Blind with a powered rolling mechanism, with selective coupling of the winding tube with the motor means

Motorized winding blind has a curtain (11) mounted on a tube (12) driven by a motor (110) has controller which can link (111) the tube to the motor or separate them depending on the conditions. If the tube is rotating at a speed inferior to the speed of the motor it is left free, when it reaches the threshold the link attaches the motor to the tube.