Abstract: The present invention pertains to a window shade drive with an automatically acting coupling, which has friction surfaces and is arranged between a stationary component (9) and a driving member (3) connected to the winding shaft, wherein two coupling elements are movable axially and in the direction of rotation in relation to one another to operate the coupling by rotating the drive member. In such a drive, one of the coupling members is connected to the drive member (8) by a member (7, 18), which generates a torque between this coupling element (disk 5) and the drive member (8) within a range, and the other coupling element is provided at an end disk of an assembly of a plurality of brake disks (1, 2), wherein the end disk is coupled nonrotatably, but axially displaceably with the driving member. The brake disks (1, 2) are alternatingly connected rotatably to the driving member (3) and to a stationary component (9).