A sheet feeder includes: a feed roller; a transmission mechanism for transmitting a first drive force to the feed roller to rotate the feed roller in a feeding direction; a motor rotatable in a forward direction and in a reverse direction opposite the forward direction to generate a second drive force; a reverse roller rotatable in the feeding direction and in a counter-feeding direction opposite the feeding direction by the second drive force; and a driven part driven by the second drive force. The transmission mechanism transmits the first drive force to the feed roller to rotate the feed roller in the feeding direction in case that the reverse roller is rotated in the feeding direction; and the transmission mechanism transmits the first drive force to the feed roller to rotate the feed roller in the feeding direction in case that the reverse roller is rotated in the counter-feeding direction.

A sheet conveying apparatus including: a locking member having an abutment surface abutting a sheet to correct skew feed of the sheet; a holding member configured to hold the locking member to rotate from a waiting position when the locking member is pushed by the sheet; a roller pair configured to nip the sheet abutting the abutment surface; a first urging portion configured to urge the holding member to the waiting position; a movable support portion configured to support the locking member in a manner that the locking member is located a retracted position where the locking member contacts a surface of the sheet and allows the sheet to pass; and a second urging portion configured to urge the locking member to a position where the abutment surface abuts a succeeding sheet.

There is provided a feed apparatus including a support unit, a feed roller, a swingable arm to support the feed roller, a guide unit, a movable member movable to a retracted position and a protruding position at which the movable member can abut against the sheet supported by the support unit, a driving source, driving transmission units; and a contact-separating mechanism to move the feed roller to a separated position and an abutment position at which the feed roller abuts against the sheet supported by the support unit. In a state in which the movable member is the protruding position and the feed roller is the separated position, a time required to start feeding of the sheet by the feed roller moved from the separated position to the abutment position is longer than a time required to shift the movable member from the protruding position to the retracted position.

A buffer means includes a buffer unit that makes paper sheets temporarily stand by and a paper stacking unit that intermittently conveys paper sheets and sucks the trailing edges of the paper sheets to stack the paper sheets stepwise and make them temporarily stand by.

A sheet conveying apparatus includes: a supporter having a support surface; a supplier including a supply roller rotatable about a rotation axis; a separator for separating sheets; a stopper pivotable about a first axis and movable between a first position at which a distal end portion of the stopper intersects a conveyance path and a second position at which the distal end portion is separated from the support surface; and a stopper cam pivotable about a second axis and movable between a third position at which the stopper cam contacts the distal end portion at the first position and a fourth position at which the stopper cam is spaced apart from the distal end portion at the first position. The second axis is located upstream of the rotation axis of the supply roller and farther from the support surface than the rotation axis.

A sheet conveying apparatus including: a locking member having an abutment surface abutting a sheet to correct skew feed of the sheet; a holding member configured to hold the locking member to rotate from a waiting position when the locking member is pushed by the sheet; a roller pair configured to nip the sheet abutting the abutment surface; a first urging portion configured to urge the holding member to the waiting position; a movable support portion configured to support the locking member in a manner that the locking member is located a retracted position where the locking member contacts a surface of the sheet and allows the sheet to pass; and a second urging portion configured to urge the locking member to a position where the abutment surface abuts a succeeding sheet.

A medium ejecting apparatus includes medium ejecting apparatus includes an ejection roller to eject a medium, a tray to load the medium ejected by the ejection roller, a medium regulating member provided with a load pressing portion on a front-end side thereof to apply a load to the medium ejected on the tray, and provided with an engaging portion on a base portion side opposite to the front-end portion, and a holding member provided with an engaged portion to engage with the engaging portion, to hold the medium regulating member in such a way that the medium regulating member can swing in a vertical direction with respect to an upper surface of the tray, and pivot along a rotation axis in a direction from the base side toward the front-end portion side, according to the ejection of the medium.

A feeding apparatus includes a mounting portion that holds a medium; a feeding roller that feeds the medium toward a feeding direction; a stopper configured to prevent the medium from moving toward the feeding direction; a supporting part that swings the feeding roller between: a first position in which the feeding roller feeds the medium while both the feeding roller and the stopper contact the medium, and a second position in which the feeding roller does not contact the medium while the stopper contacts the medium to prevent the medium from moving toward the feeding direction; and a regulating part disposed on a downstream side in feeding direction with respect to a supporting point of the supporting part. The regulating part regulates movement of the stopper by contacting a portion of the stopper that does not contact the medium in the first position.

An apparatus is provided for positioning a substrate on a support body. The apparatus comprises the support body for supporting the substrate, at least one registration element, wherein said at least one registration element is positioned and arranged for registering the substrate in a preselected position on the support body when brought into a registering state. The apparatus further comprises a registration actuator movably arranged with respect to the support body for selectively arranging a registration element into the registering state.

A conveyance apparatus whose detection unit of a printing medium is unlikely to be damaged includes a first guide that is fixed to a main body; a second guide capable of moving to a position at which the second guide forms, together with the first guide, a conveyance path through which a printing medium is conveyed and a position at which the second guide opens the conveyance path; a first lever that is provided to the main body and which detects whether or not the printing medium exists in the conveyance path; and a second lever that shields light, wherein the first lever and the second lever can swing integrally or independently in accordance with the position of the second guide.