In a cleaning station for removing residual toner from a photoreceptor in a xerographic printing apparatus, the residual toner accumulates in a hopper, and an auger at the bottom of the hopper removes the accumulated toner. The control system including at least one control organ in a gas main line feeding the gas burner for adjusting the gas throughput supplied to the gas burner nozzle. At least a part of the axial travel of the closing body is damped by means of a damping device.