Laundry treatment machine

A laundry treatment machine comprising:

• a water tank in which water is stored;
• a first laundry tub which is rotatably provided in a water tank to accommodate first laundry and is rotated about a vertical axis;
• a second laundry tub which accommodates second laundry, is detachably coupled to the first laundry tub, and is rotated integrally with the first laundry tub;
• and
• a locker which is provided in any one of the first laundry tub and the second laundry tub and fixes the one so that the one is not removed from the other of the first laundry tub and the second laundry tub,
• wherein the locker includes
• an elastic member, and
• a locking member which is supported by the elastic member, is located at a first position in a state where the second laundry tub is removed from the first laundry tub, is moved from the first position from a second position by an interference with the other of the first laundry tub and the second laundry tub in a process in which the second laundry tub is mounted on the first laundry tub, is returned to the first position by the elastic member in a state where the mounting of the second laundry tub on the first laundry tub is completed, and engages with the other at the first position to fix the second laundry tub to the first laundry tub.

A laundry treatment machine comprising:

• a first laundry tub which is rotated about a vertical axis;
• a second laundry tub which is detachably coupled to the first laundry tub and is rotated integrally with the first laundry tub;
• and
• a locker which is provided in the second laundry tub and fixes the second laundry tub so that the second laundry tub is not removed from the first laundry tub while the second laundry tub is rotated,
• wherein the second laundry tub includes
• a container which accommodates laundry, and
• a laundry tub cover which covers the container and includes an input port through which the laundry is put into the container,
• the laundry tub cover includes
• a lower cover which is coupled to an upper side of the container and includes an inlet into which water raised in the container flows when the first laundry tub is rotated and an outlet from which the water flowing in through the inlet is discharged, and
• an upper cover which is coupled to an upper side of the lower cover and defines a channel from the inlet to the outlet,
• the lower cover includes a space in which a pair of partition walls is formed and the locker is accommodated between the pair of partition walls, and
• the space is separated from the channel by the pair of partition walls.

A laundry treatment machine comprising:

• a water tank which stores water and has an open upper surface,
• a first laundry tub which is rotated about a vertical axis in the water tank;
• a second laundry tub which is detachably coupled to the first laundry tub, and is rotated integrally with the first laundry tub;
• a locking unit which is provided in the second laundry tub and is movable between a lock position at which the locking unit engages with the first laundry tub and an unlock position at which the engagement between the locking unit and the first laundry tub is released;
• a sensor operating unit which is disposed in the first laundry tub and is movable between a first position and a second position;
• and
• a sensor which is disposed in a predetermined structure fixed outside the first laundry tub and detects the sensor operating unit,
• wherein the sensor operating unit causes the sensor not to perform sensing at the first position and causes the sensor to perform sensing at the second position.