Robot cleaner

Abstract

A robot cleaner according to an embodiment may include a motor, a shaft configured to be rotated by the motor, a first member coupled to receive a rotational force from the shaft and including at least one guide protrusion protruding outwardly, and a second member coupled to allow the at least one guide protrusion to slidably move and including at least one guide groove formed in an inner side thereof. The first member may be configured to rotate relative to the second member such that the at least one guide protrusion moves along the at least one guide groove and moves upward or downward of the second member.

What is claimed is: 
     
         1 . A robot cleaner comprising:
 a motor;   a shaft configured to be rotated by the motor;   a first member configured to receive a rotational force from the shaft and including a guide protrusion protruding outwardly; and   a second member including a guide groove formed on an inner side thereof, and the second member is coupled with the first member so that the guide protrusion slidably move along the guide groove,   wherein the first member is configured to rotate relative to the second member, such that the guide protrusion moves along the guide groove and moves upward or downward of the second member, and   wherein the shaft is configured to rotate together with the first member.   
     
     
         2 . The robot cleaner of  claim 1 , further comprising a cleaning cloth module coupled to the first member to receive a rotational force from the first member. 
     
     
         3 . The robot cleaner of  claim 2 , wherein the cleaning cloth module is configured to move up or down together with the first member. 
     
     
         4 . The robot cleaner of  claim 1 , further comprising a unidirectional rotating body directly or indirectly coupled to the second member so that the second member is rotatable only in one direction. 
     
     
         5 . The robot cleaner of  claim 4 , wherein the unidirectional rotating body surrounds an outer circumferential surface of the second member. 
     
     
         6 . The robot cleaner of  claim 4 ,
 wherein the second member includes a teeth portion having a gear-shape protruding outward from an outer circumferential surface thereof, and   wherein the robot cleaner includes a unidirectional rotation gear engaged with the teeth portion to connect the second member and the unidirectional rotating body.   
     
     
         7 . The robot cleaner of  claim 4 , wherein the unidirectional rotating body is a one-way bearing. 
     
     
         8 . The robot cleaner of  claim 1 , wherein the second member includes a stopper positioned at an end of the guide groove to stop movement of the guide protrusion. 
     
     
         9 . The robot cleaner of  claim 1 , wherein the second member includes a guide protrusion insertion hole, on an upper surface thereof, and configured for the guide protrusion to be inserted into the guide groove. 
     
     
         10 . The robot cleaner of  claim 1 , wherein the second member includes a threshold extending inwardly from a lower end of an outer circumferential surface of the second member to selectively support the first member. 
     
     
         11 . The robot cleaner of  claim 1 , wherein the guide protrusion is on an outer part of an upper portion of the first member. 
     
     
         12 . The robot cleaner of  claim 1 , further comprising a gear assembly configured to transmit power of the motor to the shaft. 
     
     
         13 . The robot cleaner of  claim 12 , wherein the motor includes a worm forming portion configured to be coupled to the gear assembly. 
     
     
         14 . The robot cleaner of  claim 12 , wherein the gear assembly includes:
 a power transmission gear portion coupled to the motor, and   a shaft coupling gear portion coupled to the power transmission gear portion and the shaft.   
     
     
         15 . The robot cleaner of  claim 14 , wherein the shaft coupling gear portion includes a shaft extension portion extending in a downward axial direction from a center thereof. 
     
     
         16 . The robot cleaner of  claim 15 , wherein the shaft coupling gear portion includes a shaft coupling opening formed to pass through a center portion axially and configured to allow the shaft to be coupled thereto. 
     
     
         17 . The robot cleaner of  claim 14 , wherein the shaft coupling gear portion, the shaft, and the first member are configured to rotate together about a same rotation axis. 
     
     
         18 . The robot cleaner of  claim 1 , wherein the guide groove extends in a screw shape along a circumferential direction of the second member. 
     
     
         19 . The robot cleaner of  claim 1 , wherein the shaft includes a first magnetic body disposed at a lower end thereof. 
     
     
         20 . The robot cleaner of  claim 19 , further comprising:
 a cleaning cloth module including a second magnetic body coupled to the first magnetic body and a shielding member disposed below the second magnetic body and configured to shield a magnetic force directed to a lower side of the first magnetic body, the cleaning cloth module being configured to receive a rotational power from at least one of the shaft or the first member.