公开(公告)号：FR2369631A1

公开(公告)日：1978-05-26

申请号：FR7727689

申请日：1977-09-09

Applicant: IBM

Inventor： ARNDT RICHARD L ,  MEYERHOFER WILFRED L JR ,  STEINBAUER DAVID M

IPC: G06K7/015 ,  G06K7/016 ,  G06K7/06

Abstract: A reader for badges having rows of data representative holes therethrough, the reader including a row of data reading photo-sensitive devices or the like for sensing light passing through a row of the badge holes, a stationary encoder bar having two rows of holes therethrough and a carriage movable with the badge as it is moved across the row of data reading devices for reading the holes in the badge and carrying a pair of control photo-sensitive devices for sensing light passing through the holes of the encoder bar. The holes in the two rows in the encoder bar are slightly staggered with respect to each other so as to provide main composite states in which the two control photo-sensitive devices are either both activated or inactivated and transition states in which just one of the two control photo-sensitive devices is activated, and means are provided responsive to the transition states for reading the data representative holes in the badge at the time of occurence of the transition states during movement of the badge and carriage.