| 摘要 |
PROBLEM TO BE SOLVED: To rightly display a desired pattern by preventing the abnormal detection of a mark due to dust, etc., with respect to a belt-type pattern display device. SOLUTION: A groove 90 and a supporting area 96 are provided for a driving pulley, and the reference mark of a display belt 52 and a pattern mark 60 travels on a groove 90. Thus, dust or the like is never pressed to the belt 52 traveling on the groove 90. In addition, even if there is dust or the like entering the groove 90, it never comes into contact with the belt 52. In addition, the reference mark and the mark 60 are also prevented from being shaved or peeled by friction. Such deficiencies that an optical sensor wrongly detects dirt or the like, or cannot detect the reference mark and the pattern mark 60 are not generated. |
