Circulation device for identifying the correct brush length of brush rollers in floor care equipment, which is outstanding from the device housing for optimal operation

摘要

The method of and the device for indicating the optimum adjustment of the effective length of bristles of a bristle roller in a floor cleaning appliance driven by an electric motor is based on the measurement of a voltage drop across a resistor connected in series with the electromotor; the voltage drop is applied to a switching circuit including two parallel branches of series connected switching diodes with light-emitting diodes so as to activate the light-emitting diodes when the voltage drop exceeds the bias determined by the threshold voltages of the switching diodes.