A hopper mechanism comprising a hopper front panel and a back shoe horizontally sideable with respect to a hopper base together forming a hopper into which a horizontal deck of document cards may be placed; a belt extending around a pick roll moveable through the front panel for picking an end card in the hopper and driving it downwardly through a throat gap disposed in the hopper base; a relatively large diameter roll supporting the belt and forming a nip with the belt into which the picked document card moves from the throat gap for reversing the direction of movement of the card from vertical to horizontal; a registration arm swingable by the card as it passes out from engagement with the large diameter roll and belt for sensing the position of the card; and a reversely rotating roll coacting with a roller carried by the registration arm for moving the card backwardly, after the card has cleared the registration arm, into contact with a card abutting registration edge of the arm for providing a registered position for the card.