PROBLEM TO BE SOLVED: To provide a cleaning system for a feed roller in an image forming device medium tray without requiring operator intervention or device downtime.SOLUTION: A medium tray 28 includes a cleaning mechanism in the shape of a cleaning plate 100. The cleaning plate is drawn into a medium feeder when there is no printing medium in the medium tray. A roller of the medium feeder is rotated while being pressed against the cleaning plate, to remove dust, fragments, and other contaminants which are likely to accumulate in the medium feeder during a long time, from the roller. When the medium tray is accessed, the medium tray draws away the cleaning plate from the medium feeder.