A drive system for opening and closing rolling doors or curtains, comprising a master/slave shaft arrangement extending across an opening defined by at least one structural element of a building, the arrangement comprising: a motor; a master drive barrel having a first end and a second end, the first end being coupled to the motor for being rotationally driven by the motor, the master drive barrel having, at the second end, a master drive sprocket; a synchronizing shaft having a first end and a second end, the synchronizing shaft being rotationally driven at its second end by a first coupling assembly that includes the master drive sprocket, the rotational driving of the synchronizing shaft being synchronous with the rotational driving of the master drive barrel by the motor; a slave barrel, having a first end and a second end, the slave barrel being rotationally driven at its first end by a second coupling assembly that rotationally couples the first end of the synchronizing shaft with the first end of the slave barrel so as to rotationally drive the slave barrel, the rotational driving of the slave barrel being synchronous with the rotational driving of the synchronizing shaft and the rotational driving of the master drive barrel by the motor, a first interface support bracket having a first extending bracket; and a second interface support bracket having a second extending bracket, wherein the synchronizing shaft is freely rotatably coupled to the first and second interface support brackets (16, 20) via the first and second extending brackets (27, 21), respectively, characterized in that the first end of the master drive barrel passes through the first interface support bracket and the second end of the master drive barrel engages the second interface support bracket and is supported thereby, and wherein the first coupling assembly is arranged proximate the second interface support bracket, and the first end of the slave barrel engages the first interface support bracket and is supported thereby, and the second end of the slave barrel passes through the second interface support bracket and wherein the second coupling assembly is arranged proximate the first interface support bracket. a motor; a master drive barrel having a first end and a second end, the first end being coupled to the motor for being rotationally driven by the motor, the master drive barrel having, at the second end, a master drive sprocket; a synchronizing shaft having a first end and a second end, the synchronizing shaft being rotationally driven at its second end by a first coupling assembly that includes the master drive sprocket, the rotational driving of the synchronizing shaft being synchronous with the rotational driving of the master drive barrel by the motor; a slave barrel, having a first end and a second end, the slave barrel being rotationally driven at its first end by a second coupling assembly that rotationally couples the first end of the synchronizing shaft with the first end of the slave barrel so as to rotationally drive the slave barrel, the rotational driving of the slave barrel being synchronous with the rotational driving of the synchronizing shaft and the rotational driving of the master drive barrel by the motor, a first interface support bracket having a first extending bracket; and a second interface support bracket having a second extending bracket, wherein the synchronizing shaft is freely rotatably coupled to the first and second interface support brackets (16, 20) via the first and second extending brackets (27, 21), respectively, characterized in that the first end of the master drive barrel passes through the first interface support bracket and the second end of the master drive barrel engages the second interface support bracket and is supported thereby, and wherein the first coupling assembly is arranged proximate the second interface support bracket, and the first end of the slave barrel engages the first interface support bracket and is supported thereby, and the second end of the slave barrel passes through the second interface