Cover structure, comprising: a support structure comprising at least two parallel and mutually spaced beams; a roof mounted on the support structure and comprising a plurality of blades which are parallel to each other and movable at least between a closed configuration, in which major edges (8, 9) of the blades lie mutually close together or overlapping and the blades lie flat on the support structure, and an open configuration, in which each blade is inclined to delimit openings between successive blades; each blade comprising two rotation shafts, each coupled to a respective beam, to allow the blade to rotate about a rotation axis (X-X); a rotation mechanism mounted on at least one of the two beams and operatively coupled to the blades, wherein said rotation mechanism is configured to determine the rotation of the blades; wherein the rotation mechanism comprises: a guide rail extending along the respective beam and having a support edge having a plurality of seats; wherein the guide rail is movable along an actuation direction parallel to the respective beam; an arm for each blade, extending transversally from the shaft and having one end coupled to the support edge; an actuator operatively coupled to the guide rail to move said guide rail along the actuation direction so as to cause the ends of the arms to enter or exit the seats and the blades to rotate accordingly; wherein the rotation mechanism is characterized in that it comprises an anti-stall device coupled to the ends of the arms and configured to drag said ends into the seats when said seats are brought at the ends of the arms by the movement of the guide rail operated by the actuator; wherein the anti-stall device comprises: a bar engaged with the ends of the arms; and an anti-stall actuator coupled to the bar and configured to move the bar between a first position and a second position, wherein in the second position the ends of the arms are on a bottom of the seats. a support structure comprising at least two parallel and mutually spaced beams; a roof mounted on the support structure and comprising a plurality of blades which are parallel to each other and movable at least between a closed configuration, in which major edges (8, 9) of the blades lie mutually close together or overlapping and the blades lie flat on the support structure, and an open configuration, in which each blade is inclined to delimit openings between successive blades; each blade comprising two rotation shafts, each coupled to a respective beam, to allow the blade to rotate about a rotation axis (X-X); a rotation mechanism mounted on at least one of the two beams and operatively coupled to the blades, wherein said rotation mechanism is configured to determine the rotation of the blades; wherein the rotation mechanism comprises: a guide rail extending along the respective beam and having a support edge having a plurality of seats; wherein the guide rail is movable along an actuation direction parallel to the respective beam; an arm for each blade, extending transversally from the shaft and having one end coupled to the support edge; an actuator operatively coupled to the guide rail to move said guide rail along the actuation direction so as to cause the ends of the arms to enter or exit the seats and the blades to rotate accordingly; a guide rail extending along the respective beam and having a support edge having a plurality of seats; wherein the guide rail is movable along an actuation direction parallel to the respective beam; an arm for each blade, extending transversally from the shaft and having one end coupled to the support edge; an actuator operatively coupled to the guide rail to move said guide rail along the actuation direction so as to cause the ends of the arms to enter or exit the seats and the blades to rotate accordingly; wherein the rotation mechanism is characterized in that it comprises an anti-stall device coupled to the ends of the arms and configured to drag said ends into the seats when said seats are brought at the ends of the arms by the movement of the guide rail operated by the actuator; wherein the anti-stall device comprises: a bar engaged with the ends of the arms; and an anti-stall actuator coupled to the bar and configured to move the bar between a first position and a second position, wherein in the second position the ends of the arms are on a bottom of the seats.