A sheet stacking apparatus includes a stacking portion, a conveyance member, an abutment portion, a belt member having elasticity and configured to move the sheet toward the abutment portion, a driving source, and a controller configured to control the driving source such that (i) the belt member rotates at a first speed after the belt member contacts the current sheet and before the leading edge of the current sheet abuts against the abutment portion, and (ii) a rotational speed of the belt member is set at a second speed slower than the first speed in at least a part of a period of time after the leading edge of the current sheet abuts against the abutment portion and before the belt member contacts the next sheet.

A sheet stacking apparatus includes a stacking portion, a conveyance member, an abutment portion, a belt member, a nipping portion configured to nip the belt member, a lifting/lowering unit configured to lift and lower the nipping portion, and a controller configured to control the lifting/lowering unit such that, in a case where the belt member moves a current sheet and then moves a next sheet, (i) the nipping portion is positioned at the first position after the belt member contacts the current sheet and before the leading edge of the current sheet abuts against the abutment portion, and (ii) the nipping portion is positioned at the second position after the leading edge of the current sheet abuts against the abutment portion and before the belt member contacts the next sheet.

A sheet stacking apparatus includes a stacking portion, a conveyance member, an abutment portion, a belt member, a nipping portion configured to nip the belt member, a lifting/lowering unit configured to lift and lower the nipping portion, and a controller configured to control the lifting/lowering unit such that, in a case where the belt member moves a current sheet and then moves a next sheet, (i) the nipping portion is positioned at the first position after the belt member contacts the current sheet and before the leading edge of the current sheet abuts against the abutment portion, and (ii) the nipping portion is positioned at the second position after the leading edge of the current sheet abuts against the abutment portion and before the belt member contacts the next sheet.

An image processing system includes an image forming unit, an image decoloring unit, a first sheet stacking unit, a second sheet stacking unit, a first detector for the first sheet stacking unit, a second detector for the second sheet stacking unit, and a control unit. The control unit controls a transport path of a sheet discharged from one of the image forming unit and the image decoloring unit.

An image forming apparatus includes a tray, a casing having a first outlet, a second outlet above the first outlet, a first path, and a second path, a stack lever, a drive source, and a controller. The second path communicates with the second outlet such that a sheet conveyed along the second path is partially discharged from the second outlet and is reversed along the second path. The first outlet communicates with the first path such that the sheet conveyed along the first path is discharged from the first outlet onto the tray. The stack lever is movable between a first position where the stack lever presses a sheet on the tray and a second position higher than the first position. The controller is configured to control the drive source such that, when the sheet is discharged from the second outlet, the stack lever is at the second position.

A stacked sheet detection device includes a shaft, at least one first rotor, a second rotor, and a detection sensor. The shaft includes a plurality of attached portions that are formed in alignment along a width direction perpendicular to a discharge direction of sheets. The first rotor is attachable to any one of the plurality of attached portions. The first rotor includes a fitting portion and an arm portion. The fitting portion is configured to be fitted with one of the attached portions. The arm portion is formed to extend from the fitting portion toward the discharge tray and configured to abut on the sheets stacked on the discharge tray. The first rotor is selectively attachable to any one of the plurality of attached portions. The detection sensor is configured to detect that the second rotor rotates in the predetermined rotation direction beyond a predetermined first detection position.

There are provided an ink jet printing apparatus and a color conversion processing device that can prevent the generation of offset and blocking and can stably jet ink. A first LUT in which a total amount of ink after conversion is large overall and a second LUT in which a total amount of ink after conversion is small overall are prepared as a look-up table (LUT) that is used in color conversion processing. A LUT to be used is selected according to the number of printed mediums. The first LUT is selected in a case in which the number of printed mediums is smaller than a threshold value, and the second LUT is selected in a case in which the number of printed mediums is equal to or larger than a threshold value.

The present invention is to provide a sheet conveying apparatus capable of preventing detection error without causing damage on a sheet. The present post-processing apparatus includes a sheet conveying path to convey a sheet as being formed between an upper guide member and a lower guide member for guiding a sheet, and a detection portion including a second sensor as an electrostatic capacitance sensor to detect a sheet being conveyed on the sheet conveying path with output of the second sensor. The second sensor is fixed on a face of an upper guide member on an opposite side to the conveying path and the second sensor and the sheet conveying path are separated by the upper guide member.

The present invention is to provide a sheet conveying apparatus capable of preventing detection error without causing damage on a sheet. The present post-processing apparatus includes a sheet conveying path to convey a sheet as being formed between an upper guide member and a lower guide member for guiding a sheet, and a detection portion including a second sensor as an electrostatic capacitance sensor to detect a sheet being conveyed on the sheet conveying path with output of the second sensor. The second sensor is fixed on a face of an upper guide member on an opposite side to the conveying path and the second sensor and the sheet conveying path are separated by the upper guide member.

The apparatus includes: a conveyance directional processing part for performing processing along the conveyance direction onto the sheet, the conveyance directional processing part being constructed such that at the same position in the conveyance direction, a plurality of processing machines of two or more types are aligned in a width direction perpendicular to the conveyance direction and provided in a freely attachable and detachable manner; a condition input part through which processing conditions in the conveyance directional processing part are inputted; a display part for displaying the processing conditions; and a processing machine selection control part for acquiring types and arrangement of the processing machines to be provided in the conveyance directional processing part such that the processing conditions may be satisfied and then displaying the acquired types and arrangement on the display part.