Patent ID: 6648233
Filing Date: 2003-11-18
Classification: G06K

Abstract:
A code reading method for a recording material roll, said recording material roll including a winding core, a recording material wound about said winding core, and an information code disposed on a surface of said winding core in an arc shape, said information code including plural data indicia arranged serially, and a start indicia disposed between beginning and ending ones of said plural data indicia, and having a size greater than each of said data indicia in an arranging direction thereof, said code reading method comprising steps of:rotating said recording material roll at a constant peripheral speed in a winding direction of said recording material; while said recording material roll makes one rotation and thereafter rotates for a predetermined time, measuring passage time during which plural indicia in said information code pass said reading sensor; and checking said passage time of each of said plural indicia to determine one of said plural indicia as said start indicia, so as to determine remaining ones of said plural indicia as said data indicia to read said information code.