| 摘要 |
PROBLEM TO BE SOLVED: To form a spike-like protrusion exhibiting excellent paper or film feeding efficiency around an outer periphery of a metallic round bar without processing deformation of a shaft. SOLUTION: In the sheet feeding shaft S having a plurality of protrusions A and B formed by plastic working and rising in a rotation direction on a circumferential surface of the metallic round bar 1 confronting with a feeding roller 2 while having a sheet therebetween, the protrusion is formed in axial different two portions on the outer peripheral surface of the metallic round bar by embossing, and comprises a plurality of the spike-like protrusions having different rising directions, and the plurality of the protrusions rising in the same direction are aligned along the circumferential direction and the axial direction, and the plurality of the protrusions rising to the opposite direction are deviated to the axial direction after the protrusion row. COPYRIGHT: (C)2008,JPO&INPIT
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