A sheet feeder includes: a wheel for issuing a lowermost sheet out to a sheet processing unit; a grate for spacing the sheet apart from the wheel at a raised position and bringing the sheet into contact with the wheel at a lowered position; and a drive device for driving the grate up and down. The drive device includes: a link mechanism for movably supporting the grate; a spring for urging the grate to the lowered position; a grate raising/lowering cam for periodically driving the grate up/down; and a skip feed cam that is driven by a control device, separately from a drive system of the grate raising/lowering cam, and that, at a timing where reached is a phase at which the grate raising/lowering cam does not put the grate in the raised position, retains the grate at the raised position in order to skip feeding of the sheet.

A sheet feeder includes: a wheel for issuing a lowermost sheet out to a sheet processing unit; a grate for spacing the sheet apart from the wheel at a raised position and bringing the sheet into contact with the wheel at a lowered position; and a drive device for driving the grate up and down. The drive device includes: a link mechanism for movably supporting the grate; a spring for urging the grate to the lowered position; a grate raising/lowering cam for periodically driving the grate up/down; and a skip feed cam that is driven by a control device, separately from a drive system of the grate raising/lowering cam, and that, at a timing where reached is a phase at which the grate raising/lowering cam does not put the grate in the raised position, retains the grate at the raised position in order to skip feeding of the sheet.

A medium conveying apparatus includes: a housing having an engaged portion and a guide surface; a placement tray having an engaging portion and a placement surface; and a side guide mounted on the placement surface and protruding downstream beyond the placement tray in a medium conveying direction to restrict a medium in a width direction. The engaged portion restricts entry or removal of the engaging portion when the placement surface forms a first angle with the guide surface, and allows entry or removal of the engaging portion when the placement surface forms a second angle different from the first angle with the guide surface in attachment of the placement tray to the housing or detachment of the placement tray from the housing. A downstream end of the side guide in the conveying direction does not intersect with the guide surface as viewed from the width direction when the placement surface forms the second angle.

A medium conveying apparatus includes: a housing having an engaged portion and a guide surface; a placement tray having an engaging portion and a placement surface; and a side guide mounted on the placement surface and protruding downstream beyond the placement tray in a medium conveying direction to restrict a medium in a width direction. The engaged portion restricts entry or removal of the engaging portion when the placement surface forms a first angle with the guide surface, and allows entry or removal of the engaging portion when the placement surface forms a second angle different from the first angle with the guide surface in attachment of the placement tray to the housing or detachment of the placement tray from the housing. A downstream end of the side guide in the conveying direction does not intersect with the guide surface as viewed from the width direction when the placement surface forms the second angle.

A sheet feeding device, which is included in an image forming apparatus and includes a device attachment body, includes a sheet container configured to accommodate a sheet, a support configured to support a lower face of the sheet in the sheet container, a sheet width regulator configured to regulate a position of the sheet in a sheet width direction, a conveying force applier configured to apply a sheet conveying force in a sheet conveying direction to the sheet in the sheet container, and a sheet guide disposed above the sheet in the sheet container and configured to regulate movement of the sheet in an upper direction.

A sheet feeding device, which is included in an image forming apparatus and includes a device attachment body, includes a sheet container configured to accommodate a sheet, a support configured to support a lower face of the sheet in the sheet container, a sheet width regulator configured to regulate a position of the sheet in a sheet width direction, a conveying force applier configured to apply a sheet conveying force in a sheet conveying direction to the sheet in the sheet container, and a sheet guide disposed above the sheet in the sheet container and configured to regulate movement of the sheet in an upper direction.

An example disclosed output hopper includes a cavity to receive media units from an output of a media processing device, the cavity to cause the media units to form a stack in a first direction; a first door pivotably movable between a closed position and an open position, the first door to retain the media units in the cavity when in the closed position; a second door movable between the closed position and the open position, the second door to retain the media units in the cavity when in the closed position; wherein the first door is configured to pivot on a first axis substantially parallel to the first direction; and the second door is configured to pivot on a second axis substantially parallel to the first direction.

An example disclosed output hopper includes a cavity to receive media units from an output of a media processing device, the cavity to cause the media units to form a stack in a first direction; a first door pivotably movable between a closed position and an open position, the first door to retain the media units in the cavity when in the closed position; a second door movable between the closed position and the open position, the second door to retain the media units in the cavity when in the closed position; wherein the first door is configured to pivot on a first axis substantially parallel to the first direction; and the second door is configured to pivot on a second axis substantially parallel to the first direction.

An example of the claim method includes, in response to detecting a rejected media unit, directing a media feed path towards a reject area. The method includes depositing the rejected media unit into the reject area. The reject area is defined by a cassette surface on a body of the ribbon cassette. The ribbon cassette is unable to be removed from the media processing device until the rejected media unit is removed from the cassette surface.

Provided is a paper feeding device for a printer that is capable of absorbing an impact occurring when a rear end of paper escapes from the outer peripheral surface of a pickup roller and thus comes into contact with a bottom surface of a paper stacking part. The paper feeding device for a printer includes: a paper stacking part for stackedly accommodating at least one or more sheets of paper therein; a pickup roller protruding from a bottom surface of the paper stacking part to feed the paper forward; and buffers linearly protruding from the bottom surface of the paper stacking part to absorb the impact occurring when the rear end of the paper escapes from the outer peripheral surface of the pickup roller and then comes into contact with the bottom surface of the paper stacking part.