Control head for tools driven by a pressure medium, preferably for screwing tools driven by compressed air

The control head has a control device which generates, as a function of the rotational speed of a drive motor, a control pressure for triggering a control signal. The control device possesses a control part which is connected to the drive shaft in such a manner as to be fixed in terms of rotation and can be adjusted alternately into a blocking position and a transmitting position. In the transmitting position, it establishes a line connection between the control device and a pressure-medium outlet of the controlled head. Since the control part is connected to the drive shaft in such a manner as to be fixed in terms of rotation, it is driven directly by the motor via the driveshaft and moves, depending on the speed of the motor, alternately into the blocking and the transmitting position, so that a constant aeration and deaeration of the control device results. As a result, reliable adjustment of the control part is achieved independently of the period of use of the control head, so that the same reliable triggering of the control signal as at the start of use is also guaranteed even after a long period of use.