| 摘要 |
According to one embodiment, a conveying roller includes a rotatable first cylindrical portion which is provided with a groove on the surface thereof, a second cylindrical portion which is provided with a groove on the surface thereof, the second cylindrical portion having external diameter the same as that of the first cylindrical portion, and provided on the axis the same as that of the first cylindrical portion outside diameter as the first cylindrical portion, and a third cylindrical portion which is provided with a flat and smooth surface, the third cylindrical portion having an external diameter the same as that of the first and second cylindrical portions, and provided on the axis the same as that of the first and second cylindrical portions between the first and second cylindrical portions.
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