| http://www.w3.org/ns/prov#value | - In the skew speed detecting process (S2), the skew speed of the endless belt 8 is calculated by n-dividing (here, n is an integer equal to or larger than two) of one cycle of the endless belt and measuring the first mark M1 to the fifth mark M5 (for example, for a case of n=5) that are determined sampling points.
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