An apparatus includes a conveyor that has a planar surface supporting sheets of media. A movable element is positioned adjacent the planar surface at an initial position. The initial position is a first distance from the surface approximately equal to the thickness of a sheet of media. The movable element moves in a first direction away from the surface and in a second direction toward the surface. An actuator is connected to the movable element. The actuator detects when the movable element moves in the first direction from the initial position. In response to the movable element moving in the first direction, the actuator moves the movable element in the second direction to a pushing position. The pushing position is between the initial position and the surface. After moving the movable element to the pushing position, the actuator allows the movable element to return to the initial position.