A single-action door operator, comprising - a housing with a base plate, - a output disc, which is supported on the base plate to be rotatably movable about an output axis, wherein the output axis is configured to be connected to a lever in a torque-proof manner or to be directly connected to a rotating axis of the single-action door in a torque-proof manner, - a spring unit disposed in the housing as an energy accumulator for a closing movement or for an opening movement of the single-action door, - and a pressure roller for transferring force between the spring unit and the output disc, wherein the pressure roller rolls on a control cam, in particular on a cam contour of the output disc, - at least one damper disposed in the housing for dampening the closing movement and/or the opening movement of the single-action door, wherein, for mutually transferring forces, the damper is connected to the output disc, and is configured as an autonomous module, which is independent from the housing, and - a transmission unit for mutually transferring forces between the output disc and the damper, - wherein the transmission unit comprises a first rocker arm and a second rocker arm, wherein one end of the first rocker arm is supported to be rotatably movable in the housing, in particular on the base plate, and the other end of the first rocker arm is connected to the damper, and wherein one end of the second rocker arm is supported to be rotatably movable in the housing in particular on the base plate, and the other end of the second rocker arm is directly or indirectly connected to the damper, characterized in that the first rocker arm is connected between the two ends of the pressure roller for mutually transferring forces, and in that the transmission unit comprises a counter-roller, wherein the counter roller rolls with regard to the pressure roller on the cam contour of the output disc, and wherein the second rocker arm is connected between the two ends to the counter roller for mutually transferring forces. - a housing with a base plate, - a output disc, which is supported on the base plate to be rotatably movable about an output axis, wherein the output axis is configured to be connected to a lever in a torque-proof manner or to be directly connected to a rotating axis of the single-action door in a torque-proof manner, - a spring unit disposed in the housing as an energy accumulator for a closing movement or for an opening movement of the single-action door, - and a pressure roller for transferring force between the spring unit and the output disc, wherein the pressure roller rolls on a control cam, in particular on a cam contour of the output disc, - at least one damper disposed in the housing for dampening the closing movement and/or the opening movement of the single-action door, wherein, for mutually transferring forces, the damper is connected to the output disc, and is configured as an autonomous module, which is independent from the housing, and - a transmission unit for mutually transferring forces between the output disc and the damper, - wherein the transmission unit comprises a first rocker arm and a second rocker arm, wherein one end of the first rocker arm is supported to be rotatably movable in the housing, in particular on the base plate, and the other end of the first rocker arm is connected to the damper, and wherein one end of the second rocker arm is supported to be rotatably movable in the housing in particular on the base plate, and the other end of the second rocker arm is directly or indirectly connected to the damper, characterized in that the first rocker arm is connected between the two ends of the pressure roller for mutually transferring forces, and in that the transmission unit comprises a counter-roller, wherein the counter roller rolls with regard to the pressure roller on the cam contour of the output disc, and wherein the second rocker arm is connected between the two ends to the counter roller for mutually transferring forces.