A sheet feeding device includes a storage, a discharger, an angle adjuster, and an urging body. The storage stores a sheet bundle. The discharger contacts and discharge an uppermost sheet of the sheet bundle from the storage in a sheet conveying direction in which the uppermost sheet is conveyed. The angle adjuster changes an angle according to a remaining amount of the sheet bundle in the storage. The urging body urges a trailing end of the uppermost sheet in the sheet conveying direction toward the discharger in stages according to the remaining amount.

A sheet feeding device includes a stacking member, a feeding unit, and a detachable separation unit. The feeding unit feeds sheets stacked from the stacking member. The separation unit separates the fed sheets one by one. The separation unit includes a rotating member to abut and separate from the feeding unit and to rotate, a biasing member to bias the rotating member toward the feeding unit, and an engaged member to be engaged with an engagement member included in the sheet feeding device. The engagement member can move to a first position where the engagement member is engaged with the engaged member, and a second position away from the engaged member. Where the engagement member moves from the first to the second position when the separation unit is attached to the sheet feeding device, the separation unit moves in a detachment direction using the biasing member.

In a medium conveying device, a projector projects light, a projection light amount of the light changes, at every fixed time, to a first projection light amount and a second projection light amount less than the first projection light amount, a receiver receives the light projected from the projector, a processor determines, at fixed sampling timings, whether a reception light amount of the receiver is at a first reception light level or a second reception light level smaller than the first reception light level, determines, when the reception light amount alternately changes to the first reception light level and the second reception light level, that a medium is not present on a conveying path, and determines, when the reception light amount is fixed to either the first reception light level or the second reception light level, that the medium is present on the conveying path.

A sheet feeding device includes a stacking member, a feeding unit, and a detachable separation unit. The feeding unit feeds sheets stacked from the stacking member. The separation unit separates the fed sheets one by one. The separation unit includes a rotating member to abut and separate from the feeding unit and to rotate, a biasing member to bias the rotating member toward the feeding unit, and an engaged member to be engaged with an engagement member included in the sheet feeding device. The engagement member can move to a first position where the engagement member is engaged with the engaged member, and a second position away from the engaged member. Where the engagement member moves from the first to the second position when the separation unit is attached to the sheet feeding device, the separation unit moves in a detachment direction using the biasing member.

In a medium conveying device, a projector projects light, a projection light amount of the light changes, at every fixed time, to a first projection light amount and a second projection light amount less than the first projection light amount, a receiver receives the light projected from the projector, a processor determines, at fixed sampling timings, whether a reception light amount of the receiver is at a first reception light level or a second reception light level smaller than the first reception light level, determines, when the reception light amount alternately changes to the first reception light level and the second reception light level, that a medium is not present on a conveying path, and determines, when the reception light amount is fixed to either the first reception light level or the second reception light level, that the medium is present on the conveying path.

A medium conveying apparatus includes a medium tray on which a medium is placed, a skew corrector that rotates the medium in such a manner that a part of an end of the medium is aligned with a predetermined line, a rotating member that contacts with the medium, and a conveyor that conveys the medium in a conveying direction, wherein the rotating member is supported rotatably on the medium tray so that, when the medium moves in a direction different from the conveying direction, the rotating member rotates following the medium.

A printing apparatus determines a change in torque of a motor that moves a pick arm for translating print media, determines based on the change in torque whether a media in present adjacent to the pick arm.

A medium conveying apparatus includes a first optical sensor located on an upper part of the housing and in a central part of the housing in a direction perpendicular to a medium conveying direction, a second optical sensor located on an upper part of the housing and on a side of the first optical sensor in the direction perpendicular to the medium conveying direction, and a processor to detect a folding of a medium based on the first signal or the second signal, and stop feeding of the medium by the feed roller in accordance with a detection result of the folding of the medium. The first light emitter emits first light toward a downstream side of the medium in the medium conveying direction, and the second light emitter emits second light toward an upstream side of the medium in the medium conveying direction.

A sheet feeding device includes a storage, a discharger, an angle adjuster, and an urging body. The storage stores a sheet bundle. The discharger contacts and discharge an uppermost sheet of the sheet bundle from the storage in a sheet conveying direction in which the uppermost sheet is conveyed. The angle adjuster changes an angle according to a remaining amount of the sheet bundle in the storage. The urging body urges a trailing end of the uppermost sheet in the sheet conveying direction toward the discharger in stages according to the remaining amount.

A sheet feeding apparatus includes an apparatus body, a sheet supporting portion configured to be movably supported between a sheet supporting position and a first storage position, and a sheet feed unit including a sheet feed portion, and an abutment member, the sheet feed unit being movably supported among a sheet feed position, a waiting position, and a second storage position. The sheet feed unit is positioned in the sheet feed position or the waiting position in a case where the sheet supporting portion is positioned in the sheet supporting position. The sheet feed unit is positioned in the second storage position in a case where the sheet supporting portion is positioned in the first storage position. The abutment member moves so as to be stored in the apparatus body in a case where the sheet feed unit moves from the waiting position to the second storage position.