| 摘要 |
A sheet feeder includes a stopper located in a sheet feeding route and supported rotatably about a pivot point. The posture of the stopper is changed among a restricting posture in which a contact end contacts a leading end SU of a sheet S in a feeding direction to restrict the leading end SU before a feeding of the sheet S by a feeding mechanism, a feed allowing posture assumed during feeding and in which the contact end is separated from the leading end SU in a first direction F in which the sheet S is fed, and a rotational posture reached by rotating the stopper about the pivot point so that the contact end faces in a second direction opposite the first direction. The second direction is a direction in which the sheet S is pulled out from the feeding mechanism when a jam occurs.
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