A device for generating a unidirectional rotational movement - with a housing, in which a drive gear and output gear with fixed rotating axis (D2, D3) is mounted, as well as a movable transmission element is installed, - whereby, the drive gear and output gear have a tooth section (21, 31) a guide section (22, 32). - whereby, the transmission element has three fixed toothed rails (45, 46, 47) connected to one another, - whereby, at its original position, the drive gear is partly engaged by one tooth of its tooth section with one of the two straight toothed rails (45, 46) of the adjustable transmission element, - whereby, the drive gear has an arrangement where it can move through an angle (α, β) from its original position by rotational movement in a clockwise direction (rotating to the right) as well as by rotational movement in an anticlockwise direction (rotating to the left), - whereby, by rotational movement to the right or rotational movement to the left, the toothed section of the drive gear completely engages with one of the two straight toothed rails (45, 46) of the transmission element, of which both run parallel and their rows of teeth face each other and, whereby, the drive gear is thereby supported by its guide section on the transmission element, - whereby, the output gear engages with its toothed section in the toothed mesh of one row of teeth of a third toothed rail of the transmission element, - whereby, rotational movement (R, L) of the drive gear around its rotational axis through the force guide of the transmission element results in unidirectional rotational movement of the output gear around the rotational axis. - with a housing, in which a drive gear and output gear with fixed rotating axis (D2, D3) is mounted, as well as a movable transmission element is installed, - whereby, the drive gear and output gear have a tooth section (21, 31) a guide section (22, 32). - whereby, the transmission element has three fixed toothed rails (45, 46, 47) connected to one another, - whereby, at its original position, the drive gear is partly engaged by one tooth of its tooth section with one of the two straight toothed rails (45, 46) of the adjustable transmission element, - whereby, the drive gear has an arrangement where it can move through an angle (α, β) from its original position by rotational movement in a clockwise direction (rotating to the right) as well as by rotational movement in an anticlockwise direction (rotating to the left), - whereby, by rotational movement to the right or rotational movement to the left, the toothed section of the drive gear completely engages with one of the two straight toothed rails (45, 46) of the transmission element, of which both run parallel and their rows of teeth face each other and, whereby, the drive gear is thereby supported by its guide section on the transmission element, - whereby, the output gear engages with its toothed section in the toothed mesh of one row of teeth of a third toothed rail of the transmission element, - whereby, rotational movement (R, L) of the drive gear around its rotational axis through the force guide of the transmission element results in unidirectional rotational movement of the output gear around the rotational axis.