| 摘要 |
A sheet feeder includes a cassette for containing a plurality of stacked sheets, a holding member for holding sheets from above, a pickup roller which contacts the uppermost sheet from above during one rotation, thereby feeding and transporting the uppermost sheet, a rotatable subsidiary holding member which is rotated in synchronization with a rotation of the pickup roller and in the same rotating direction as the pickup roller, and contacts and holds the sheets from above during each rotation before the pickup roller contacts the uppermost sheet. The distance between a rotation axis and that surface of the rotatable subsidiary holding member which contacts the uppermost sheet is equal to, or greater than the distance between a rotation axis and that surface of the pickup roller which contacts the sheet.
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