Coiling shaft assembly for a building opening shading device, in particular a roller shutter, a venetian blind or a vertical awning, having: a coiling shaft (1; 11) for winding and unwinding a curtain or for winding and unwinding elevator belts used for winding and releasing the curtain, an electric motor (2; 12) acting on the coiling shaft (1; 11) for actuating the coiling shaft (1; 11) during normal operation, and an emergency hand crank mechanism (3; 13) acting on the coiling shaft (1; 11) for actuating the coiling shaft (1; 11) in an emergency, wherein the electric motor (2; 12) is arranged at one end of the coiling shaft (1; 11) and the emergency hand crank mechanism (3; 13) is arranged at another end of the coiling shaft (1; 11), and an output shaft of the emergency hand crank mechanism (3; 13) is coupled to the coiling shaft (1; 11), thus causing rotation of a output shaft of the emergency hand crank mechanism (3; 13) during motor operation, wherein the coiling shaft (1; 11) is supported on the building side at its one end via the stator (22; 122) of the electric motor (2; 12) and at its other end via a housing of the emergency hand crank mechanism (3; 13) in a state attached to suspensions provided there for this purpose, characterized in that the emergency hand crank mechanism (3; 13) is designed with a transmission ratio of 1:1 to 6:1 without self-locking, wherein a locking and release device (4, 5, 6, 7; 14) is provided, which locks an unintentional rotation of the coiling shaft (1; 11) in the unwinding direction induced by the weight force of the curtain without human intervention, but releases a rotation of the coiling shaft (1; 11) in the winding-up direction by means of an emergency hand crank. a coiling shaft (1; 11) for winding and unwinding a curtain or for winding and unwinding elevator belts used for winding and releasing the curtain, an electric motor (2; 12) acting on the coiling shaft (1; 11) for actuating the coiling shaft (1; 11) during normal operation, and an emergency hand crank mechanism (3; 13) acting on the coiling shaft (1; 11) for actuating the coiling shaft (1; 11) in an emergency, wherein the electric motor (2; 12) is arranged at one end of the coiling shaft (1; 11) and the emergency hand crank mechanism (3; 13) is arranged at another end of the coiling shaft (1; 11), and an output shaft of the emergency hand crank mechanism (3; 13) is coupled to the coiling shaft (1; 11), thus causing rotation of a output shaft of the emergency hand crank mechanism (3; 13) during motor operation, wherein the coiling shaft (1; 11) is supported on the building side at its one end via the stator (22; 122) of the electric motor (2; 12) and at its other end via a housing of the emergency hand crank mechanism (3; 13) in a state attached to suspensions provided there for this purpose, characterized in that the emergency hand crank mechanism (3; 13) is designed with a transmission ratio of 1:1 to 6:1 without self-locking, wherein a locking and release device (4, 5, 6, 7; 14) is provided, which locks an unintentional rotation of the coiling shaft (1; 11) in the unwinding direction induced by the weight force of the curtain without human intervention, but releases a rotation of the coiling shaft (1; 11) in the winding-up direction by means of an emergency hand crank.