A medium conveying apparatus includes a tray, and a side guide in which a side guide surface opposing to an end face of a medium placed on the tray is formed, wherein the side guide includes a side guide main body that is supported by the tray, and a movable member that is supported by the side guide main body so as to be stored and expanded, a height of the movable member relative to the tray is equal to a first height that is higher than a height of the side guide main body relative to the tray when the movable member is expanded, and is equal to a second height that is lower than the first height when the movable member is stored, and a notch is formed on the movable member such that a depression is formed on the side guide surface when the movable member is expanded.

A sheet conveying device includes a sheet loader, a sheet feeder, an optical sensor, and a rotary member. The sheet loader is configured to load a sheet. The sheet feeder is configured to feed the sheet loaded on the sheet loader. The optical sensor is configured to detect the sheet at a predetermined position on the sheet loader in a width direction of the sheet and at a predetermined position in a sheet conveyance passage in the width direction of the sheet. The rotary member is configured to rotate to a first position when the sheet is not at the predetermined position on the sheet loader and a second position when the sheet is at the predetermined position. The rotary member has a detection target portion configured to be detected by the optical sensor when the rotary member is located at the first or second position.

An image reading apparatus includes a stacking portion, a feeding unit, a reading unit, and a discharge portion provided below the stacking portion. The feeding unit feeds a sheet stacked on the stacking portion in a feeding direction. The reading unit reads an image on the fed sheet and the discharge portion discharges the read sheet. The stacking portion includes first and second support surfaces that support the sheet and first and second regulating units to regulate a position of the sheet in a widthwise direction using two opposing ends of the sheet. The second support surface is retractable from a predetermined section above the discharge portion. The first support surface includes a downstream support portion that supports the sheet on a downstream side of the predetermined section in the feeding direction. A part of the second regulating surface is positioned on the downstream support portion.

An image reading apparatus includes a stacking portion, a feeding unit, a reading unit, and a discharge portion provided below the stacking portion. The feeding unit feeds a sheet stacked on the stacking portion in a feeding direction. The reading unit reads an image on the fed sheet and the discharge portion discharges the read sheet. The stacking portion includes first and second support surfaces that support the sheet and first and second regulating units to regulate a position of the sheet in a widthwise direction using two opposing ends of the sheet. The second support surface is retractable from a predetermined section above the discharge portion. The first support surface includes a downstream support portion that supports the sheet on a downstream side of the predetermined section in the feeding direction. A part of the second regulating surface is positioned on the downstream support portion.

A sheet feeding device includes a sheet loading table on which a bundle of sheets is stacked, an identification mark on an end face of the sheet loading table, and an imaging unit to identify the identification mark.

A sheet feeding device includes a sheet loading table on which a bundle of sheets is stacked, an identification mark on an end face of the sheet loading table, and an imaging unit to identify the identification mark.

An image reading apparatus includes a first stacking unit having a stacking surface, and an abutment portion that abuts a document stacked on the stacking surface, a feeding unit, a reading unit, a second stacking unit, a first detection unit, a rotating shaft, a drive unit, and a control unit. The second stacking unit receives the document fed by the feeding unit and read by the reading unit. The first detection unit detects presence or absence of the document stacked on the first stacking unit. The drive unit rotates the first stacking unit around the rotating shaft rotatably supporting the first stacking unit. At a predetermined timing after the first detection unit detects the absence of the document on the first stacking unit, the control unit controls the drive unit to rotate the first stacking unit in a direction with which the abutment portion is lowered.

An image reading apparatus includes a first stacking unit having a stacking surface, and an abutment portion that abuts a document stacked on the stacking surface, a feeding unit, a reading unit, a second stacking unit, a first detection unit, a rotating shaft, a drive unit, and a control unit. The second stacking unit receives the document fed by the feeding unit and read by the reading unit. The first detection unit detects presence or absence of the document stacked on the first stacking unit. The drive unit rotates the first stacking unit around the rotating shaft rotatably supporting the first stacking unit. At a predetermined timing after the first detection unit detects the absence of the document on the first stacking unit, the control unit controls the drive unit to rotate the first stacking unit in a direction with which the abutment portion is lowered.

An example paper feed device includes a tray to feed printing paper, a magnetic force generation element to generate a magnetic flux, a 3D magnetic sensor to detect changes in the a density of the magnetic flux generated by the magnetic force generation element in each of three axes, and a controller. The tray has a movable element that is movable in relation to the printing paper. Either the magnetic force generation element or the 3D magnetic sensor is attached to the movable element. The controller determines the position of the movable element based on a detection signal received from the 3D magnetic sensor.

An example paper feed device includes a tray to feed printing paper, a magnetic force generation element to generate a magnetic flux, a 3D magnetic sensor to detect changes in the a density of the magnetic flux generated by the magnetic force generation element in each of three axes, and a controller. The tray has a movable element that is movable in relation to the printing paper. Either the magnetic force generation element or the 3D magnetic sensor is attached to the movable element. The controller determines the position of the movable element based on a detection signal received from the 3D magnetic sensor.