Vacuum cleaner with agitator

摘要

In a vacuum cleaner of the type arranged to stop a motor when a driven brush is overloaded due to engagement with carpet or other obstacles, a starter circuit responsive to a manually operable power switch is employed to start the motor. The rotation of the rotary brush is detected by way of a sensor which produces a voltage. The starter circuit produces another voltage for a given period of time after the power switch is turned on, and these voltages are fed to a latching circuit which produces a control voltage when neither of the first nor second voltage is applied thereto, and the control voltage causes a control unit to interrupt power to the electric motor. As a result, once the latching circuit is put in a latching state after the brush has stopped, the motor is prevented from starting again unless the power switch is turned on again.