A printing apparatus can prevent a print medium from buckling during discharging. In a case in which the print conveyance speed determined by the print mode is higher than or equal to a specified speed, the print medium after printing is conveyed to a discharging tray at the print conveyance speed, and in a case in which the print conveyance speed determined by the print mode is lower than the specified speed, the print medium after printing is conveyed to the discharging tray at the specified speed increased from the print conveyance speed.

A sheet discharge device includes a discharge member and a control part. When a sheet is discharged to a first offset position, the control part shifts the discharge member to a first reception position separated from a home position in a second direction by a second distance shorter than a first distance, and shifts the discharge member to a first discharge position separated from the first reception position in the first direction by the first distance after the sheet is received. When the sheet is discharged to a second offset position, the control part shifts the discharge member to a second reception position separated from the home position in the first direction by the second distance, and shifts the discharge member to a second discharge position separated from the second reception position in the second direction by the first distance after the sheet is received.

A sheet discharge apparatus includes a first tray for stacking sheets, and a sheet bundle forming unit that forms a sheet bundle on the first tray. The sheet bundle forming unit forms a first sheet bundle on the first tray, and forms a second sheet bundle on the first sheet bundle to be offset from the first sheet bundle. When forming each of the first sheet bundle and the second sheet bundle on the first tray, the sheet bundle forming unit divides sheets constituting each of the sheet bundles into a plurality of sets and discharges the sheets in a plurality of times for each sheet bundle. A number of sheets included in a first sheet set of the first sheet bundle is set smaller than a number of sheets included in a first sheet set of the second sheet bundle.

A sheet discharge apparatus includes a first tray for stacking sheets, and a sheet bundle forming unit that forms a sheet bundle on the first tray. The sheet bundle forming unit forms a first sheet bundle on the first tray, and forms a second sheet bundle on the first sheet bundle to be offset from the first sheet bundle. When forming each of the first sheet bundle and the second sheet bundle on the first tray, the sheet bundle forming unit divides sheets constituting each of the sheet bundles into a plurality of sets and discharges the sheets in a plurality of times for each sheet bundle. A number of sheets included in a first sheet set of the first sheet bundle is set smaller than a number of sheets included in a first sheet set of the second sheet bundle.

A sheet processing apparatus includes a conveyance member to convey a sheet, a pair of alignment members to move relatively in a width direction orthogonal to a conveyance direction of the sheet by the conveyance member, so as to align a position of the sheet in the width direction, and a lower portion to support a lower surface of the sheet between the pair of alignment members in the width direction. In addition, a pair of upper portions are arranged on one side and the other side of the lower portion in the width direction and each hold an upper surface of the sheet, wherein the pair of upper portions is positioned lower than the lower portion in a plane vertical to the conveyance direction.

A sorting device is mounted, in an image forming apparatus, in a sheet discharge space open at its front and sheet-discharge-direction downstream side, insertably or extractably at the downstream side. The sorting device includes a base portion, a tray portion, and a flexible member. The base portion is mounted, with the tray portion, in the base portion. The base portion has, in its upstream part in sheet discharge direction, a base inclined portion inclined upward downstream. With the base portion mounted in the bottom portion, the base inclined portion faces, across a predetermined gap, a bottom inclined surface inclined upward downstream in discharge direction. The tray portion is supported on the base portion to be reciprocatable in sheet width direction orthogonal to discharge direction. The flexible member is fitted to the base inclined portion and fills the gap between the base inclined portion and the bottom inclined surface.

A sheet post-processing apparatus that performs post-processing on a sheet on which an image is formed includes: a punch hole forming portion; and a sheet bundle forming portion that has a conveyance portion, stops a first sheet on a conveyance path, and conveys a second sheet after the first sheet to a position overlapping the first sheet to form a sheet bundle. The sheet post-processing apparatus includes a shift portion to make a shift so that a relative position between the first sheet and the second sheet in a direction orthogonal to a conveyance direction becomes a relative position at which the second sheet does not overlap a punch hole of the first sheet to make the second sheet overlap the first sheet, and forms a sheet bundle in which sheets overlapped with each other are deviated in a width direction.

A sheet post-processing apparatus that performs post-processing on a sheet on which an image is formed includes: a punch hole forming portion; and a sheet bundle forming portion that has a conveyance portion, stops a first sheet on a conveyance path, and conveys a second sheet after the first sheet to a position overlapping the first sheet to form a sheet bundle. The sheet post-processing apparatus includes a shift portion to make a shift so that a relative position between the first sheet and the second sheet in a direction orthogonal to a conveyance direction becomes a relative position at which the second sheet does not overlap a punch hole of the first sheet to make the second sheet overlap the first sheet, and forms a sheet bundle in which sheets overlapped with each other are deviated in a width direction.

In order to properly suppress a discharge defect corresponding to an image ratio of a sheet, in the case where a coefficient of friction is different according to the image ratio of an image on the sheet, an air blowing section is arranged to blow air toward a downstream side in a transport direction from between a downstream-side end portion of a first stacking section and an upstream-side end portion of a second stacking section. When an image ratio of an image on a sheet by an image forming apparatus is a first value, the air blowing section sets an air quantity blown to the sheet at a first air quantity F1, while when the image ratio is a second value higher than the first value, setting the air quantity blown to the sheet at a second air quantity F2 larger than the first air quantity F1.

In order to properly suppress a discharge defect corresponding to an image ratio of a sheet, in the case where a coefficient of friction is different according to the image ratio of an image on the sheet, an air blowing section is arranged to blow air toward a downstream side in a transport direction from between a downstream-side end portion of a first stacking section and an upstream-side end portion of a second stacking section. When an image ratio of an image on a sheet by an image forming apparatus is a first value, the air blowing section sets an air quantity blown to the sheet at a first air quantity F1, while when the image ratio is a second value higher than the first value, setting the air quantity blown to the sheet at a second air quantity F2 larger than the first air quantity F1.