Method of controlling opening and closing of a door in drum-type washing machine

Abstract

The present invention provides a method of controlling opening and closing of a door in a drum-type washing machine. When the drum-type washing machine suddenly stops in operation, e.g. in case of a mistake by a user or a switch-off, a water level of a tub is sensed, which shows lower than predetermined height, thereafter a door-lock-system is converted that the door can be opened. To this function, the present invention has an effect on protecting against an outflow of water of the tub in case the user wrongly opens the door.

1 . A method of controlling opening and closing of a door in a drum-type washing machine, comprising the steps of: 
 operating the drum-type washing machine;    locking the door not to open;    sensing a water level of a tub when the drum-type washing machine stops operating; and    releasing a door-lock so that the door becomes ready to open if the water level of the tub is sensed lower than predetermined height    
   
   
       2 . The method as set forth in  claim 1 , wherein the door-lock is maintained when the water level of the tub is sensed higher than predetermined height.  
   
   
       3 . The method as set forth in  claim 2 , further comprising: returning to the step of sensing the water level of the tub when the water level of the tub is sensed higher than predetermined height.  
   
   
       4 . The method as set forth in  claim 1 , wherein a door-opening-lamp is turned on when the door-lock is released.  
   
   
       5 . The method as set forth in  claim 1 , wherein a door-closing-lamp is turned off when the door-lock is released.  
   
   
       6 . The method as set forth in  claim 1 , wherein a child-lock is turned on before the drum-type washing machine stops.  
   
   
       7 . The method as set forth in  claim 6 , wherein the child-lock is turned on with manipulation by a user.  
   
   
       8 . The method as set forth in  claim 6 , wherein the child-lock is automatically turned on after the drum-type washing machine is operating.  
   
   
       9 . The method as set forth in  claim 6 , wherein the door-lock is released after the child-lock is released when the drum-type washing machine comes to a stop and the water level of the tub is lower than predetermined height.  
   
   
       10 . The method as set forth in  claim 9 , wherein the child-lock is turned off by the user.  
   
   
       11 . The method as set forth in  claim 9 , wherein the child-lock is automatically turned off.  
   
   
       12 . The method as set forth in  claim 9 , wherein the door-lock is maintained when the water level of the tub is sensed higher than predetermined height.  
   
   
       13 . The method as set forth in  claim 11 , further comprising: returning to the step of sensing the water level of the tub when the water level of the tub is sensed higher than predetermined height.  
   
   
       14 . The method as set forth in  claim 9 , wherein the door-opening-lamp is turned on and the door-closing-lamp is turned off when the door-lock is released.