A banknote deposit and withdrawal apparatus causes a control section to function as an inserted medium counting unit, a normal medium counting unit and an abnormal mediums number calculation unit. The normal medium counting unit again feeds out and conveys banknotes from the banknote deposit and withdrawal section to the verification section in a quantity corresponding to the number of inserted banknotes, conveys abnormal banknotes that are verified as abnormal by the verification section to the banknote deposit and withdrawal section together with following banknotes but conveys normal banknotes that are verified as normal by the verification section to the temporary holding section and retains the normal banknotes therein, and counts a number of normal banknotes. The abnormal mediums number calculation unit subtracts the number of normal banknotes from the number of inserted banknotes to calculate an abnormal banknotes number.

A banknote deposit and withdrawal apparatus causes a control section to function as an inserted medium counting unit, a normal medium counting unit and an abnormal mediums number calculation unit. The normal medium counting unit again feeds out and conveys banknotes from the banknote deposit and withdrawal section to the verification section in a quantity corresponding to the number of inserted banknotes, conveys abnormal banknotes that are verified as abnormal by the verification section to the banknote deposit and withdrawal section together with following banknotes but conveys normal banknotes that are verified as normal by the verification section to the temporary holding section and retains the normal banknotes therein, and counts a number of normal banknotes. The abnormal mediums number calculation unit subtracts the number of normal banknotes from the number of inserted banknotes to calculate an abnormal banknotes number.

A sheet feeding device includes a feeding guide of resin material constituting a sheet feeding path along which a sheet is fed; a feeding roller for feeding the sheet along the feeding path, the feeding roller being provided with a metal shaft; a sheet sensor configured to detect the sheet fed along the sheet feeding path; and a grounding member electrically grounding the shaft. The feeding guide has a guiding surface for guiding the sheet, and the guiding surface is provided with a hole portion for exposing the shaft to the sheet feeding path.

A sheet feeding device includes a feeding guide of resin material constituting a sheet feeding path along which a sheet is fed; a feeding roller for feeding the sheet along the feeding path, the feeding roller being provided with a metal shaft; a sheet sensor configured to detect the sheet fed along the sheet feeding path; and a grounding member electrically grounding the shaft. The feeding guide has a guiding surface for guiding the sheet, and the guiding surface is provided with a hole portion for exposing the shaft to the sheet feeding path.

A sheet post-processing device is connected to a punch processing unit. The punch processing unit includes a skew detection unit and a punch unit. The skew detection unit detects a skew amount of a sheet. The punch unit forms punch holes at positions of the sheet according to the skew amount. The sheet post-processing device includes a processing tray, a paddle, a driver, and a control unit. The sheet of which the skew amount is detected by the skew detection unit is mounted on the processing tray. The paddle conveys the sheet on the processing tray by a paddle operation. The driver drives the paddle to perform the paddle operation. The control unit is configured to operate the driver to control a number of times the paddle operation is performed by the paddle based on the skew amount.

Provided are a post-processing apparatus, an image forming apparatus, and a post-processing method capable of avoiding the occurrence of a malfunction due to a failure to discharge a sheet bundle after a binding process. A plurality of sheets is loaded on a stack tray. A staple unit binds the plurality of sheets. A discharge roller discharges the sheet bundle bound by the staple unit from the stack tray. Each time a sheet is conveyed to the stack tray, an aligning unit moves between a first position in contact with the sheet loaded on the stack tray and a second position separating from the sheet. A detection processing unit detects a failure of discharging the sheet bundle by the discharging roller. A stop processing unit can stop the operation of the aligning unit when the discharge failure is detected by the detection processing unit.

Provided are a post-processing apparatus, an image forming apparatus, and a post-processing method capable of avoiding the occurrence of a malfunction due to a failure to discharge a sheet bundle after a binding process. A plurality of sheets is loaded on a stack tray. A staple unit binds the plurality of sheets. A discharge roller discharges the sheet bundle bound by the staple unit from the stack tray. Each time a sheet is conveyed to the stack tray, an aligning unit moves between a first position in contact with the sheet loaded on the stack tray and a second position separating from the sheet. A detection processing unit detects a failure of discharging the sheet bundle by the discharging roller. A stop processing unit can stop the operation of the aligning unit when the discharge failure is detected by the detection processing unit.

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 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 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 detection unit detects presence or absence of the document stacked on the second stacking unit. The drive unit rotates the first stacking unit around the rotating shaft rotatably supporting the first stacking unit. Based on the detection of the absence of the document on the second stacking unit by the detection unit, the control unit controls the drive unit to rotate the first stacking unit in a direction with which the abutment portion is lowered.