A printer extension kit that modifies a printer to receive and output longer pieces of paper. The printer extension kit includes an input extension part, an output extension part, and an output extension clip. The paper tray of a printer is extended by the input extension part allowing the printer to hold longer pieces of paper. The input extension part is attached to the paper tray of a printer. The output extension part allows a printer to output longer pieces of paper. In more detail, the output extension part prevents longer pieces of paper from falling of the catch tray of a printer. The output extension part is attached into the catch tray of a printer. The output extension clip provides another means for a printer to output longer pieces of paper. In more detail, the output extension clip is attached along the output paper catch of a printer.

A sheet stacker includes a sheet stacking portion, a pair of sheet restrictors, a sheet feeder, and a position detector. A bundle of sheets is stacked on the sheet stacking portion in a stacking direction, and the sheet stacking portion moves in the stacking direction. The pair of sheet restrictors move in a width direction to regulate a position of the bundle of sheets in the width direction. The sheet feeder feeds a top sheet of the bundle of sheets at a sheet feeding position in a sheet feeding direction. The sheet feeding position is disposed at a top of the bundle of sheets in the stacking direction. The position detector is disposed between the pair of sheet restrictors in the width direction and above the sheet feeding position in the stacking direction. The position detector detects a position of the pair of sheet restrictors in the width direction.

A sheet stacker includes a sheet stacking portion, a pair of sheet restrictors, a sheet feeder, and a position detector. A bundle of sheets is stacked on the sheet stacking portion in a stacking direction, and the sheet stacking portion moves in the stacking direction. The pair of sheet restrictors move in a width direction to regulate a position of the bundle of sheets in the width direction. The sheet feeder feeds a top sheet of the bundle of sheets at a sheet feeding position in a sheet feeding direction. The sheet feeding position is disposed at a top of the bundle of sheets in the stacking direction. The position detector is disposed between the pair of sheet restrictors in the width direction and above the sheet feeding position in the stacking direction. The position detector detects a position of the pair of sheet restrictors in the width direction.

A post-processing apparatus includes: a processing unit configured to pull in a recording medium transported from an upstream apparatus and perform processing on the recording medium; a discharge unit to which the recording medium processed by the processing unit is discharged; and a lifting drive device configured to, in a case where a folded recording medium is pulled into the processing unit, move the discharge unit downward such that a height of the discharge unit is lower than a height of the discharge unit in a case where an unfolded recording medium is pulled into the processing unit.

A medium placement device configured to stack a plurality of sheets of a medium discharged from a discharge unit of a processing device, the medium placement device including a plurality of support units being provided in a width direction intersecting with a discharge direction of the medium, and being configured to support, on a support surface from below in a gravitational direction, the medium discharged from the discharge unit. The plurality of support units are provided extending in the discharge direction, and are inclined downward in a gravitational direction from upstream to downstream in the discharge direction, and a first support unit and a second support unit arranged at a lower position in the gravitational direction with respect to the first support unit as viewed in the width direction, the first support unit and the second support unit being arranged alternatingly in the width direction.

A medium placement device is configured to stack a plurality of sheets of a medium discharged from a discharge unit of a processing device. The medium placement device includes a plurality of support units being provided in a width direction intersecting with a discharge direction of the medium discharged from the discharge unit, and being configured to support the medium at a support surface from below in a gravitational direction. A first support unit and a second support unit are provided in an alternating manner in the width direction, the second support unit being arranged at a position lower than the first support unit in the gravitational direction when viewed in the width direction. The first support unit is provided with a bridging member configured to couple a lower side of the discharge unit in the gravitational direction and the support surface of the first support unit.

A medium placement device is configured to stack a plurality of sheets of a medium discharged from a discharge unit of a processing device. The medium placement device includes a plurality of support units being provided in a width direction intersecting with a discharge direction of the medium discharged from the discharge unit, and being configured to support the medium at a support surface from below in a gravitational direction. A first support unit and a second support unit are provided in an alternating manner in the width direction, the second support unit being arranged at a position lower than the first support unit in the gravitational direction when viewed in the width direction. The first support unit is provided with a bridging member configured to couple a lower side of the discharge unit in the gravitational direction and the support surface of the first support unit.

According to examples, an apparatus may include a guide frame, a standard position pawl movably attached to the guide frame, the standard position pawl to engage a standard pawl detent. The apparatus may also include a custom position pawl movably engaged with the guide frame, the custom position pawl to engage custom pawl teeth of a rack. The apparatus may further include a switch in movable engagement with the guide frame, the switch being movable between a first position at which the custom position pawl is maintained at a disengaged position with respect to the custom pawl teeth of the rack and a second position at which the custom position pawl is free to move between the disengaged position and an engaged position with respect to the custom pawl teeth of the rack.

According to examples, an apparatus may include a guide frame, a standard position pawl movably attached to the guide frame, the standard position pawl to engage a standard pawl detent. The apparatus may also include a custom position pawl movably engaged with the guide frame, the custom position pawl to engage custom pawl teeth of a rack. The apparatus may further include a switch in movable engagement with the guide frame, the switch being movable between a first position at which the custom position pawl is maintained at a disengaged position with respect to the custom pawl teeth of the rack and a second position at which the custom position pawl is free to move between the disengaged position and an engaged position with respect to the custom pawl teeth of the rack.

The aligning device receives a sheet conveyed in a sheet conveyance direction in a stackable manner and aligns a position of the sheet in the sheet conveyance direction. The moving mechanism moves the sheet aligned by the aligning device in the sheet conveyance direction together with the aligning device. The controller selectively executes a first mode in which first post-processing is performed on the sheet and then second post-processing is performed on the sheet and a second mode in which the second post-processing is performed on the sheet without performing the first post-processing on the sheet. The controller, in response to a selection of the first mode or the second mode, causes the moving mechanism to adjust a position of the aligning device in the sheet conveyance direction before the aligning device receives the sheet as a target of the first post-processing or the second post-processing, respectively.