The present invention is to provide a sheet aligning apparatus that is capable of detecting misalignment. A control portion of a post-processing apparatus causes a front aligning member and a rear aligning member to be moved to an aligning position to align sheets conveyed to a processing tray, causes the front aligning member to be moved from the aligning position to a detecting position, and determines whether an electrostatic capacitance sensor detects misalignment (sheet shifting from a sheet bundle). When it is determined that the sensor detects misalignment, the front aligning member is moved from the detecting position to the aligning position so that sheets are realigned.

A sheet feeder, which is included in an image forming apparatus, includes a sheet loader, an air blowing device, a regulator, a sheet attracting device, and a sheet conveying body. The sheet loader loads a sheet bundle including a sheet and a subsequent sheet placed below the sheet. The air blowing device blows air and lifts the sheet over the sheet bundle. The regulator regulates movement of the subsequent sheet, and includes an opposing portion located upper end and separated from the sheet loader toward the downstream side of the sheet conveying direction and an inclined portion upwardly inclined relative to a vertical axis from a same position as the sheet loader to the downstream side of the sheet conveying direction. The sheet attracting device attracts the sheet lifted over the sheet bundle. The sheet conveying body conveys the sheet in a sheet conveying direction.

A sheet feeder device includes: a sheet feed tray configured to store a sheet stack formed with a plurality of paper sheets; an elastic member capable of expanding and contracting; a contact mechanism configured to bring the elastic member into contact with an edge of the sheet stack; an expansion mechanism configured to expand the elastic member in a direction of stacking of the paper sheets; and a control unit configured to cause the expansion mechanism to expand the elastic member while the elastic member is kept in contact with the edge of the sheet stack by the contact mechanism.

A sheet feeding device includes a document mounting board, in which a downstream end of the document mounting board in the feeding direction of the documents in the feed mechanism is connected to a scanner body so as to be rotatable about a first turning shaft parallel to a rotation shaft of a pickup roller, the first turning shaft is located downstream from the feed mechanism in the feeding direction of the documents in the feed mechanism, a mounting surface of the document mounting board on which the documents are mounted is located above the pickup roller when the documents are mounted on the document mounting board, and the document mounting board turns about the first turning shaft such that the mounting surface moves downward and the mounting surface moves downward from a contact portion of the pickup roller with the document when the documents mounted on the document mounting board are fed.

A conveying apparatus includes: receiving trays including (i) a lowest tray, (ii) a first receiving tray different from the lowest tray, and (iii) at least one second receiving tray including one second receiving tray disposed just below the first receiving tray; a conveying mechanism; and a supporter supporting the receiving trays. The conveying apparatus further includes a transmission mechanism configured to perform at least one of: transmission of upward movement of the first receiving tray from a receiving position to an upper position, to downward movement of the one second receiving tray from the receiving position to a lower position; and transmission of the downward movement of the one second receiving tray to the upward movement of the first receiving tray.

A sheet feeding apparatus includes a feeding unit, a separation surface, a first separation part configured to switch between a condition in which the first separation part is protruded from the separate surface and the sheet comes into contact with the first separation part and a condition in which the first separation part is retracted from the separate surface and the sheet does not come into contact with the first separation part and to be fixed to each of the two conditions and a second separation part configured to be movable in a direction from a condition in which the second separation part is protruded from the separate surface and the sheet is capable of come into contact with the second separation part to a condition in which the second separation part is retracted from the separate surface, according to a contact force received from the sheet.

The present invention is to provide a sheet aligning apparatus that is capable of detecting misalignment. A control portion of a post-processing apparatus causes a front aligning member and a rear aligning member to be moved to an aligning position to align sheets conveyed to a processing tray, and determines whether an electrostatic capacitance sensor detects misalignment (sheet shifting from a sheet bundle). After the control portion determines that there is no misalignment, the control portion performs detection strength adjusting for a sensor and initial value setting for detecting misalignment of a next sheet.

A reading apparatus includes a reading unit configured to read a document, a feeding tray on which the document to be read by the reading unit is stacked, a feeding roller that feeds the document from the feeding tray to a position where the document is read by the reading unit, a feeding pressure plate that presses the document against the feeding roller so that the document is pinched between the feeding roller and the feeding pressure plate, and a discharge roller that discharges the document read by the reading unit to underneath the feeding pressure plate, wherein a position of the discharge roller moves depending on a number of documents pinched between the feeding roller and the feeding pressure plate.

The present invention is to provide a sheet aligning apparatus that is capable of detecting misalignment. A control portion of a post-processing apparatus causes a front aligning member and a rear aligning member to be moved to an aligning position to align sheets conveyed to a processing tray, and determines whether an electrostatic capacitance sensor detects misalignment (sheet shifting from a sheet bundle). After the control portion determines that there is no misalignment, the control portion performs detection strength adjusting for a sensor and initial value setting for detecting misalignment of a next sheet.

The present invention is to provide a sheet aligning apparatus that is capable of detecting misalignment. A control portion of a post-processing apparatus causes a front aligning member and a rear aligning member to be moved to an aligning position to align sheets conveyed to a processing tray, causes the front aligning member to be moved from the aligning position to a detecting position, and determines whether an electrostatic capacitance sensor detects misalignment (sheet shifting from a sheet bundle). When it is determined that the senor detects misalignment, the front aligning member is moved from the detecting position to the aligning position so that sheets are realigned.