Drawer-type washing machine and process of washing laundry using the same

A process of washing laundry using a drawer-type washing machine, with first and second cabinets respectively containing first and second washing tub units and set in a housing to be movable forward or backward relative to said housing, comprising:

• a first step of determining whether the first washing tub unit is in its rinsing operation;
• a second step of determining whether the rinsing operation of the first washing tub unit has been finished when it is determined at the first step that the first washing tub unit is in its rinsing operation, and a third step of feeding processed water from the rinsing operation of the first washing tub unit to the second washing tub unit when it is determined at the second step that the rinsing operation of the first washing tub unit has been finished;
• a fourth step of determining whether the second washing tub unit is in its rinsing operation when it is determined at the first step that the first washing tub unit is not in its rinsing operation;
• a fifth step of determining whether the rinsing operation of the second washing tub unit has been finished when it is determined at the fourth step that the second washing tub unit is in its rinsing operation;
• and
• a sixth step of feeding processed water from the rinsing operation of the second washing tub unit to the first washing tub unit when it is determined at the fifth step that the rinsing operation of the second washing tub unit has been finished.

A process of washing laundry using a drawer-type washing machine, comprising the steps of:

• sensing pressure induced by pressure head inside a washing tub unit after water is fed into said washing tub unit, and determining whether water inside the washing tub unit has reached a reference level;
• turning on a heater to heat the water inside the washing tub unit when it is determined that the water has reached the reference level;
• determining whether the pressure inside the washing tub unit has been increased equal to or higher than a reference level;
• discharging highly pressurized vapor from said washing tub unit to the atmosphere when it is determined that the pressure inside the washing tub unit has been increased equal to or higher than the reference level;
• determining whether the pressure inside the washing tub unit has been reduced lower than the reference level;
• and
• stopping the vapor discharging action when it is determined that the pressure inside the washing tub unit has been reduced lower than the reference level.