Patent ID: 6550290
Filing Date: 2003-04-22
Classification: D06F

Abstract:
A drum type washing machine comprising:a drum for accommodating laundry; a variable speed electric motor for rotating the drum; rotational speed detecting means for detecting a rotational speed of the drum or the motor; rise time detecting means for detecting a rise time in a case where the drum or the motor is accelerated from a first predetermined rotational speed to a second predetermined rotational speed while a predetermined constant power is being supplied to the motor; fall time detecting means for detecting a fall time in a case where the drum or the motor is decelerated from a third predetermined rotational speed to a fourth predetermined rotational speed while the motor is in a free running state; weight detecting means for detecting a weight of the laundry in the drum on the basis of results of detection by the rise and fall time detecting means; and balance detecting means for detecting a balance of the laundry in the drum, wherein the weight detecting means compensates a result of detection according to a result of detection by the balance detecting means.