Sheet conveyer and image reading apparatus

摘要

A sheet conveyer including a sheet support, a pickup roller, a separator roller, a holder, a guide, an urging member, and a contact section is provided. The holder is swingable and supports the pickup roller rotatably. The guide is attached to the holder and movable to swing relatively to the holder along with a swing movement of the holder. Urging force from the urging member acts on the guide to move toward a first position with respect to the holder. The contact section contacts a contacting part in the guide to restrict, the contacting part from being moved along with the swing movement of the holder. The guide is movable relatively to the holder from a position closer to the first position toward a position closer to a second position against the urging force from the urging member and allows the holder to further move toward the uppermost position.

主权项

1. A sheet conveyer, comprising:
a sheet support configured to support a sheet; a pickup roller configured to convey the sheet supported by the sheet support downstream in a conveying direction; a separator roller configured to separate the sheet conveyed by the pickup roller to convey one by one further downstream in the conveying direction; a holder configured to support the pickup roller rotatably, the holder being configured to be swingable about an axis extending in parallel with a rotation axis of the pickup roller to move between a lowermost position, in which a gap between the pickup roller and the sheet support is smallest, and an uppermost position, in which the gap is largest; a guide configured to be attached to the holder and movable to swing relatively to the holder about a swing axis in accordance with a swing movement of the holder between a first position and a second position with respect to the holder, the guide comprising a guide surface arranged on an upstream side of the holder in to the conveying direction, the guide being configured guide a leading end of the sheet set on the sheet support to the gap between the pickup roller and the sheet support along the guide surface; an urging member arranged between the holder and the guide, the urging member being configured to apply urging force that acts on the guide to move toward the first position with respect to the holder; and a contact section configured to contact a contacting part in the guide, when the holder swings to move from a position closer to the lowermost position toward a position closer to the uppermost position, and restrict the contacting part from being moved along with the swing movement of the holder, wherein, when the holder swingably moved toward the uppermost position is at a position where the contact section restricts the contacting part from moving, the guide is movable relatively to the holder from a position closer to the first position toward a position closer to the second position against the urging force from the urging member and allows the holder to further move toward the uppermost position.