To enable placement of a regulating member which regulates a position of an end of a paper sheet at a desired position, and stable sheet feeding. A fixing member for standard size (33) is guided to engage with a fixing hole for standard size (42) and, in a state where the fixing member for standard size (33) positions a trailing end regulator (24), a fixing member for non-standard size (34) does not engage with a rack aear (43).

A sheet conveyance apparatus including a transmission unit that transmits an ultrasonic wave toward a sheet and a reception unit that receives the ultrasonic wave includes a change unit that changes a distance of a conveyance path of the sheet according to sheet information about the sheet to be conveyed.

A sheet conveyance apparatus including a transmission unit that transmits an ultrasonic wave toward a sheet and a reception unit that receives the ultrasonic wave includes a change unit that changes a distance of a conveyance path of the sheet according to sheet information about the sheet to be conveyed.

When a discharge count has exceeded a specified number of sheets, a sheet discharge device executes a process of moving down a discharge tray by a specified quantity and thereafter moving up the discharge tray until a top-surface detection part outputs a top-surface detection signal, while clocking a move-up time lasting from a move-up start of the discharge tray until output of the top-surface detection signal by the top-surface detection part. When the move-up time is equal to or less than a reference time, the sheet discharge device makes a next sheet discharged while the top-surface detection part outputs the top-surface detection signal; on the other hand, when the move-up time is more than the reference time, the sheet discharge device executes a correction process of moving down the discharge tray before making the next sheet discharged.

When a discharge count has exceeded a specified number of sheets, a sheet discharge device executes a process of moving down a discharge tray by a specified quantity and thereafter moving up the discharge tray until a top-surface detection part outputs a top-surface detection signal, while clocking a move-up time lasting from a move-up start of the discharge tray until output of the top-surface detection signal by the top-surface detection part. When the move-up time is equal to or less than a reference time, the sheet discharge device makes a next sheet discharged while the top-surface detection part outputs the top-surface detection signal; on the other hand, when the move-up time is more than the reference time, the sheet discharge device executes a correction process of moving down the discharge tray before making the next sheet discharged.

A paper guide mechanism that facilitates operation without easily allowing deviation of a wide guide unit. In a paper guide mechanism (10), a position-holding member (13) holds the widthwise position of a widthwise moving member (12) by bringing a first fixing-side locking section (11e) and a first moving-side locking section (13d) into contact with each other on a surface perpendicular to a direction of movement of the widthwise moving member (12) even in a case in which the widthwise moving member (12) is about to move in any direction along the width direction. The position-holding member (13) has a movement-restricting section (13e). The movement-restricting section (13e) restricts the movement of the position-holding member (13) in an orientation in which the first fixing-side locking section (11e) and the first moving-side locking section (13d) are moved away from each other by bringing the position-holding member (13) into contact with a second surface of a supporting member (11) on a side opposite to a first surface.

A paper guide mechanism that facilitates operation without easily allowing deviation of a wide guide unit. In a paper guide mechanism (10), a position-holding member (13) holds the widthwise position of a widthwise moving member (12) by bringing a first fixing-side locking section (11e) and a first moving-side locking section (13d) into contact with each other on a surface perpendicular to a direction of movement of the widthwise moving member (12) even in a case in which the widthwise moving member (12) is about to move in any direction along the width direction. The position-holding member (13) has a movement-restricting section (13e). The movement-restricting section (13e) restricts the movement of the position-holding member (13) in an orientation in which the first fixing-side locking section (11e) and the first moving-side locking section (13d) are moved away from each other by bringing the position-holding member (13) into contact with a second surface of a supporting member (11) on a side opposite to a first surface.

A sheet feeder includes a manual feeding tray to stack a sheet, the tray being openable and closable to a main body by rotation about a rotation axis in a direction perpendicular to a sheet feeding direction; a sheet width regulating member provided in the manual feeding tray to regulate a side edge of the sheet in a sheet width direction and to have a variable regulating width; an auxiliary tray that does not move with an opening/closing operation of the manual feeding tray and stacks the sheet with the manual feeding tray; a sheet width regulating member provided in the auxiliary tray to regulate the side edge of the sheet and to have a variable regulating width; a link member interlocking the regulating members; and a feeding roller provided in the main body to individually feed the sheet stacked over the manual feeding tray and the auxiliary tray.

A sheet feeder includes a manual feeding tray to stack a sheet, the tray being openable and closable to a main body by rotation about a rotation axis in a direction perpendicular to a sheet feeding direction; a sheet width regulating member provided in the manual feeding tray to regulate a side edge of the sheet in a sheet width direction and to have a variable regulating width; an auxiliary tray that does not move with an opening/closing operation of the manual feeding tray and stacks the sheet with the manual feeding tray; a sheet width regulating member provided in the auxiliary tray to regulate the side edge of the sheet and to have a variable regulating width; a link member interlocking the regulating members; and a feeding roller provided in the main body to individually feed the sheet stacked over the manual feeding tray and the auxiliary tray.

A sheet feeding device having sheet feed tray configured to support multiple sheets be movably inserted to a main body. A sheet feed roller is configured to contact the sheet supported by the sheet feed tray and rotate to apply a feeding force to feed the sheet in a sheet feed direction. The sheet feed roller is configured to contact the sheet feed tray when there is no sheet on the sheet feed tray. A push latch mechanism is arranged on a downstream side with respect to the sheet feed roller in the sheet feed direction. A state of the push latch mechanism is alternately switched between an engaged state and a disengaged state every time when a pressing force is applied to the push latch mechanism. A first spring is configured to exert an elastic force to move the sheet feed tray toward a near side.