| 摘要 |
The invention provides a roller having excellent flexibility and wear resistance. The invention also provides a sheet delivery unit equipped with this roller. The unit is prevented from being clogged up with sheets due to rigidities of the sheets. Also, simultaneous delivery of plural sheets is suppressed. The allowable range of rigidities of paper currencies and the allowable range of their widths can be extended. The roller has a central portion extending along an axis, an outer peripheral portion formed around the central portion and made of a resilient body, and plural helical ribs connecting together the central portion and the outer peripheral portion. Each rib consists of a resilient body. Each rib is so shaped as to thicken gradually from the central portion toward the outer peripheral portion.
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