A roller assembly, roller unit, and conveyor apparatus which convey a convey target must intermittently convey a convey target. For this purpose, there is provided a technique for adjusting an idle load using a frictional force set such that roller rotation is stopped when the load of the convey target is larger than the convey force of the roller and the roller is rotated to convey the convey target when the load of the convey target is smaller than the convey force of the roller.
For example, in PTL1, a sliding bearing is disposed between a driving roller fitted on a shaft portion and a convey roller. When a driving force is transmitted from a driving source to the driving roller, the sliding bearing is driven to rotate upon rotation of the driving roller by a frictional force between the sliding bearing and the driving roller. Upon rotation of the sliding bearing, the driving force is transmitted to the convey roller by the frictional force between the sliding bearing and the convey roller.