Apparatus for magnetically encoding a card which includes a timing wheel frictionally engaging the card as the card is moved along a slot. The wheel has about its peripheral annulus a series of evenly spaced magnetic timing bits which are read out by a read head located adjacent the annular surface of...http://www.google.fr/patents/US4598479?utm_source=gb-gplus-shareBrevet US4598479 - Timing wheel for card encoder
