| 摘要 |
A sheet feeder ( 20 ) includes a tray ( 30 ) for receiving a recording sheet (P). A feed roller ( 41 ) is disposed above the tray ( 30 ) and feeds the sheet (P). A bottom plate ( 50 ) is at a downstream end of the tray ( 30 ) and moves up and down for pressingly contacting a leading end of the sheet (P) with the roller ( 41 ). A position changer ( 60 ) moves the bottom plate ( 50 ) between a first position (S 1 ) where the bottom plate ( 50 ) contacts the roller ( 41 ), and a second position (S 2 ) where the bottom plate ( 50 ) is spaced from the roller ( 41 ). An elevating mechanism ( 70 ) moves the bottom plate ( 50 ) set to the second position up and down each time the sheet (P) is fed and brings the leading end of the sheet (P) into contact with the roller ( 41 ) when the bottom plate ( 50 ) is moved.
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