A sheet postprocessing device includes a sheet conveying passage, a sheet tray, an inlet guide, a processing device, and a blowing device. Though the sheet conveying passage, a sheet on which an image has been formed is conveyed. The sheet tray is arranged downstream of the sheet conveying passage and has sheets stacked on it. The inlet guide is arranged at the downstream end of the sheet conveying passage and guides a sheet to the sheet tray. The processing device performs predetermined processing on a sheet stacked on the sheet tray. The blowing device blows air, from the upstream side in the sheet conveying direction, between the top face of the top-most sheet in the sheets stacked on the sheet tray and the bottom face of the subsequent sheet sent from the inlet guide into the sheet tray.

An image forming system includes: an image former that forms an image on a paper sheet; a post-processor that executes post-processing on the paper sheet; a paper sheet stacker that stacks the paper sheet output from the post-processor on a paper discharge tray; and a hardware processor that controls the image former, the post-processor, and the paper sheet stacker, wherein in a case where insertion paper is output to the paper sheet stacker and is placed on an uppermost paper sheet on the paper discharge tray, when it is determined that a size of the insertion paper is larger than a size of the uppermost paper sheet by a predetermined size determination value or more, the hardware processor executes insertion paper processing control for changing an outer shape of the insertion paper to change the size of the insertion paper and outputting the insertion paper to the paper sheet stacker.

An image forming system includes: an image former that forms an image on a paper sheet; a post-processor that executes post-processing on the paper sheet; a paper sheet stacker that stacks the paper sheet output from the post-processor on a paper discharge tray; and a hardware processor that controls the image former, the post-processor, and the paper sheet stacker, wherein in a case where insertion paper is output to the paper sheet stacker and is placed on an uppermost paper sheet on the paper discharge tray, when it is determined that a size of the insertion paper is larger than a size of the uppermost paper sheet by a predetermined size determination value or more, the hardware processor executes insertion paper processing control for changing an outer shape of the insertion paper to change the size of the insertion paper and outputting the insertion paper to the paper sheet stacker.

A sheet stacking device includes a conveyance part and a stopper. The conveyance part includes a tray and a conveyance member. On the tray, sheet stacks are stacked. The conveyance member conveys the sheet stack on the tray. The stopper is located on a downstream side of the tray and prevents the sheet stack from falling from the tray. The stopper has a main plate and an anti-slip member. The main plate is inclined upward. The main plate has a contact face coming into contact with the sheet stack and a bent face bent downward from a downstream side tip end of the contact face. The anti-slip member is provided from a downstream side end portion of the contact face to the bent face. A frictional coefficient between the anti-slip member and the sheet stack is larger than a frictional coefficient between the sheet stack and the contact face.

A sheet stacking device includes a conveyance part and a stopper. The conveyance part includes a tray and a conveyance member. On the tray, sheet stacks are stacked. The conveyance member conveys the sheet stack on the tray. The stopper is located on a downstream side of the tray and prevents the sheet stack from falling from the tray. The stopper has a main plate and an anti-slip member. The main plate is inclined upward. The main plate has a contact face coming into contact with the sheet stack and a bent face bent downward from a downstream side tip end of the contact face. The anti-slip member is provided from a downstream side end portion of the contact face to the bent face. A frictional coefficient between the anti-slip member and the sheet stack is larger than a frictional coefficient between the sheet stack and the contact face.

A printing apparatus capable of producing a product having the optimum image layout dependent on a discharge destination even when saddle-stitching is canceled due to input of image data for sheets in excess of a limit of a saddle-stitchable number of sheets. The number of output sheets per one copy is calculated based on image data. When the number of output sheets per one copy exceeds a saddle-stitchable number of sheets, it is selected whether to perform the center folding processing on the sheets on which images are printed without performing the saddle stitching processing thereon or to perform neither the saddle stitching processing nor the center folding processing on the sheets on which images are printed.

A printing apparatus capable of producing a product having the optimum image layout dependent on a discharge destination even when saddle-stitching is canceled due to input of image data for sheets in excess of a limit of a saddle-stitchable number of sheets. The number of output sheets per one copy is calculated based on image data. When the number of output sheets per one copy exceeds a saddle-stitchable number of sheets, it is selected whether to perform the center folding processing on the sheets on which images are printed without performing the saddle stitching processing thereon or to perform neither the saddle stitching processing nor the center folding processing on the sheets on which images are printed.

A sheet processing apparatus includes a conveyance unit configured to convey a sheet, a creasing unit configured to form a first crease and a second crease different from the first crease on the sheet, and a detection unit configured to detect a direction of the first crease. When the second crease is to be formed after the formation of the first crease by the creasing unit, a direction of the second crease with respect to a widthwise direction of the sheet is controlled based on a detection result of the detection unit.

A sheet processing apparatus includes a conveyance unit configured to convey a sheet, a creasing unit configured to form a first crease and a second crease different from the first crease on the sheet, and a detection unit configured to detect a direction of the first crease. When the second crease is to be formed after the formation of the first crease by the creasing unit, a direction of the second crease with respect to a widthwise direction of the sheet is controlled based on a detection result of the detection unit.

A conveyor device for a folding apparatus for folding textiles includes an infeed region for a textile and an outfeed region for a folded textile. A first belt conveyor conveys the textile on a first conveyor plane from the infeed region to a first transfer unit, which feeds the textile to a second conveyor plane of a second belt conveyor. At least one second transfer unit and at least one additional belt conveyor having an additional conveyor plane are disposed downstream of the belt conveyor. At least two subassemblies, each configured as modular conveyor units are provided, into which one belt conveyor and at least one transfer unit are each integrated. The conveyor device is modularly configured, in that a plurality of modular conveyor units are disposed one atop the other and connected to each other.