The tray stacker has three conveyors that are used to transport trays through the machine. When trays are stopped on the middle conveyor, an arm is lowered and a set of actuators are used to grab the tray. Once the tray is secure, the arm lifts the tray from the conveyor to make room for the next tray. The arm is lowered to place any currently stacked trays in the new tray and then grab the bottom tray. This process is repeated to build a stack of trays. Once a stack is complete, it is transport