A roller shutter including: - an apron; - a shaft, movable in rotation according to an axis, onto which winds up and from which unwinds the apron; - a system for driving the shaft in rotation, this driving system including, on the one hand, a manual or motorized means for driving in rotation, on the other hand, a transmission means, integral in rotation with the shaft and driven in rotation by the driving means and, yet on the other hand, at least one means for mounting this transmission means in displacement relative to said driving means or said driving means relative to the transmission means, respectively; - a shaft braking system including: - at least one fixed braking organ; - at least one movable braking organ (5; 5') the transmission means or the driving means, respectively, includes, integral in rotation with the shaft, movable relative to such a fixed braking organ, this between, on the one hand, an active braking position, in which such a movable organ (5; 5') cooperates with such a fixed organ for ensuring a braking, and, on the other hand, an inactive braking position, in which such a movable organ (5; 5') does not cooperate with such a fixed organ; - at least one control means (6; 6') for controlling the passing of the movable braking organ or organs (5; 5') from an active braking position to an inactive braking position, this only under the action of the actuation in rotation of the system for driving the shaft in rotation, - wherein the control means (6; 6') each include, on the one hand, a recess (60; 60') the driving means includes, on the other hand, a recess (61; 61') the transmission means includes and which is located at least partially in front of the recess (60; 60') of the driving means and, yet on the other hand, a ball (62; 62') accommodated and movable in these recesses (60, 61; 60', 61') of the driving means and the transmission means. - an apron; - a shaft, movable in rotation according to an axis, onto which winds up and from which unwinds the apron; - a system for driving the shaft in rotation, this driving system including, on the one hand, a manual or motorized means for driving in rotation, on the other hand, a transmission means, integral in rotation with the shaft and driven in rotation by the driving means and, yet on the other hand, at least one means for mounting this transmission means in displacement relative to said driving means or said driving means relative to the transmission means, respectively; - a shaft braking system including: - at least one fixed braking organ; - at least one movable braking organ (5; 5') the transmission means or the driving means, respectively, includes, integral in rotation with the shaft, movable relative to such a fixed braking organ, this between, on the one hand, an active braking position, in which such a movable organ (5; 5') cooperates with such a fixed organ for ensuring a braking, and, on the other hand, an inactive braking position, in which such a movable organ (5; 5') does not cooperate with such a fixed organ; - at least one control means (6; 6') for controlling the passing of the movable braking organ or organs (5; 5') from an active braking position to an inactive braking position, this only under the action of the actuation in rotation of the system for driving the shaft in rotation, - wherein the control means (6; 6') each include, on the one hand, a recess (60; 60') the driving means includes, on the other hand, a recess (61; 61') the transmission means includes and which is located at least partially in front of the recess (60; 60') of the driving means and, yet on the other hand, a ball (62; 62') accommodated and movable in these recesses (60, 61; 60', 61') of the driving means and the transmission means. - at least one fixed braking organ; - at least one movable braking organ (5; 5') the transmission means or the driving means, respectively, includes, integral in rotation with the shaft, movable relative to such a fixed braking organ, this between, on the one hand, an active braking position, in which such a movable organ (5; 5') cooperates with such a fixed organ for ensuring a braking, and, on the other hand, an inactive braking position, in which such a movable organ (5; 5') does not cooperate with such a fixed organ; - at least one control means (6; 6') for controlling the passing of the movable braking organ or organs (5; 5') from an active braking position to an inactive braking position, this only under the action of the actuation in rotation of the system for driving the shaft in rotation, - wherein the control means (6; 6') each include, on the one hand, a recess (60; 60') the driving means includes, on the other hand, a recess (61; 61') the transmission means includes and which is located at least partially in front of the recess (60; 60') of the driving means and, yet on the other hand, a ball (62; 62') accommodated and movable in these recesses (60, 61; 60', 61') of the driving means and the transmission means.