Drum-type washing machine

Abstract

In a drum-type washing machine, a plurality of dampers include a first damper and a second damper, the second damper is provided in such a manner that compression force on the second damper from a rotary drum rotated in the forward direction is larger than that on the first damper, the second damper and a vibration detection portion are arranged posterior to a gravity center of a water tank in the front and rear direction, and the first damper is arranged anterior to the second damper. Thus, precise imbalance determination is performed, so that low vibration is realized.

1 . A drum-type washing machine, comprising:
 a rotary drum having a substantially horizontal axis of rotation;   a water tank incorporating the rotary drum;   a motor for rotating the rotary drum;   a washing machine housing elastically-supporting the water tank from underneath by a plurality of dampers; and   a vibration detector for detecting vibration of the water tank,   wherein the plurality of dampers comprise a first damper and a second damper,   the second damper is provided in such a manner that compression force on the second damper from the rotary drum rotating in a forward direction is larger than that on the first damper,   the second damper and the vibration detector are arranged posterior to a gravity center of the water tank in a front and rear direction, and   the first damper is arranged anterior to the second damper.   
     
     
         2 . The drum-type washing machine according to  claim 1 , wherein:
 the second damper and the vibration detector are arranged in a substantially identical perpendicular plane to a perpendicular plane including a gravity center of the motor in the front and rear direction.   
     
     
         3 . The drum-type washing machine according to  claim 1 , wherein:
 the vibration detector and the motor are arranged symmetrically about the axis of rotation of the rotary drum.   
     
     
         4 . The drum-type washing machine according to  claim 1 , further comprising a spring suspending the water tank from the washing machine housing, wherein:
 the spring is arranged in a substantially identical perpendicular plane to a perpendicular plane including the gravity center of the water tank in the front and rear direction.   
     
     
         5 . The drum-type washing machine according to  claim 2 , wherein:
 the vibration detector and the motor are arranged symmetrically about the axis of rotation of the rotary drum.   
     
     
         6 . The drum-type washing machine according to  claim 2 , further comprising a spring suspending the water tank from the washing machine housing, wherein:
 the spring is arranged in a substantially identical perpendicular plane to a perpendicular plane including the gravity center of the water tank in the front and rear direction.