A card convey device includes a card convey unit, a punching unit, a counting unit, and a control unit. The card convey unit selectively conveys a card in a discharging direction and an opposite direction thereto. The punching unit punches the card which slows down, while the card is conveyed by the...http://www.google.com.tw/patents/US5424522?utm_source=gb-gplus-share專利 US5424522 - Card convey device and method therefor
