| 摘要 |
PROBLEM TO BE SOLVED: To prevent a robber roller from partially wearing due to conveyance of sheets. SOLUTION: A conveyer roller 10 has a collar 12 and a robber roller 14 covering the outer periphery of the collar 12. The rubber roller 14 is formed on its outer peripheral part with several protrusions 14a which are projected at equal intervals along the outer periphery thereof and which are extended axially, and is also formed in its inner peripheral part with recesses 14b which are extended axially, and the collar 12 has, at its outer peripheral part, protrusions 12a engaged in the recesses 14b formed in the inner peripheral part of the robber roller 14. Further, the protrusions 14a formed on the outer peripheral part of the rubber roller 14 and the recesses 14b formed in the inner peripheral part thereof have such a relationship as to have a predetermined phase difference therebetween along the peripheral direction in order to prevent the protrusions 14a from twisting in the direction orthogonal to the sheet conveying direction.
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