Example implementations relate to media stacking mechanisms. In some examples, a printing device can include a stacking mechanism that includes a tamper to tamp print media positioned within the stacking mechanism, and a controller comprising instructions to: tamp a first sheet of print media received at the stacking mechanism a first distance based on a first size of the first sheet of print media, tamp a second sheet of print media received at the stacking mechanism a second distance based on the second size of the second sheet of print media, wherein the second sheet of print media is positioned over the first sheet of print media, and tamp a third sheet of print media received at the stacking mechanism the second distance when the third sheet of print media is the first size, wherein the third sheet of print media is positioned over the second sheet of print media.

A conveyance device includes a tray on an upper surface of the conveyance device and an upper guide below the tray. The tray receives a sheet, and the upper guide defines a conveyance path in which the sheet is conveyed. The upper guide is movable together with the tray to open the conveyance path.

A medium feeding apparatus capable of switching between a first feeding mode and a second feeding mode, in which in the first feeding mode, when a first detection section positioned downstream of a feeding roller in a medium feeding direction detects passage of a trailing end of a preceding medium in a feeding standby state in which driving of the feeding roller that feeds the medium is stopped, starting the driving of the feeding roller to perform feeding of a succeeding medium, and in the second feeding mode, when a second detection section positioned downstream of the first detection section in the medium feeding direction detects the passage of the trailing end of the preceding medium in the feeding standby state, starting the driving of the feeding roller to perform the feeding of the succeeding medium.

A transport apparatus includes a mounting section on which a medium is to be mounted, a drive section configured to drive the mounting section in a moving direction and a protection section configured to be switched between a protection state for protecting the drive section and a release state for releasing protection of the drive section. The mounting section has a driven section that engages with the drive section and is driven by the drive section. When the driven section driven by the drive section engages with the drive section, the protection section is in the release state, and when the driven section does not engage with the drive section, the protection section is in the protection state.

A post-processing device includes a processing tray on which a medium recorded by a recording portion is loaded, and a first paddle which is an example of a transportation member provided above the processing tray and rotating to transport the medium toward the upstream in a transport direction. In addition, the post-processing device includes a roller which is an example of a rotating body provided above the rotation shaft of the first paddle, and a paddle unit frame which is an example of an upper member provided above the roller. The roller and the paddle unit frame are positioned within a rotation locus of the first paddle.

A post-processing device includes an output unit that outputs a medium; a stacking unit on which the medium that is output is stacked; and a blow-out unit that is disposed below the output unit and that blows gas toward the medium that is output, wherein an amount of the gas blown is adjusted in accordance with a type of the medium.

The sheet storage apparatus of the present disclosure includes an attachment unit to which a storing bag for sheets is attached; a holding unit that holds the sheets toward an inner side in a storage direction of the storing bag attached to the attachment unit, the sheets being stacked and stored in the storing bag; and a closing unit that closes an entrance of the storing bag by sandwiching the storing bag from outside thereof. The closing unit closes the entrance by moving from a first position to a second position, the first position being a position before the closing unit starts sandwiching the storing bag, the second position being a position when the closing unit sandwiches the storing bag. The closing unit passes through the inner side in the storage direction than the first position between moving from the first position to the second position.

A sheet alignment apparatus includes a supporting portion configured to support a sheet, a first alignment member configured to abut an end portion in a first direction of the sheet supported by the supporting portion and align a position of the sheet in the first direction, a first moving unit configured to move the first alignment member in the first direction, a second alignment member configured to abut an end portion in a second direction of the sheet supported by the supporting portion and align a position of the sheet in the second direction, the second direction being perpendicular to the first direction, and a second moving unit configured to move the second alignment member in the second direction, wherein the first moving unit is disposed below the supporting portion, and wherein the second moving unit is disposed above the supporting portion.

A sheet stacker includes a tray to store a stack of sheets, a conveyor above the tray, a leading end guide above the tray, and an air exhaust. The conveyor conveys a sheet in a conveyance direction. The leading end guide is downstream from the conveyor in the conveyance direction. The leading end guide guides the sheet from the conveyor to the tray. The air exhaust exhausts air above an upper surface of the stack of sheets on the tray to an upstream from the tray in the conveyance direction. Further, the leading end guide holds a leading end of the sheet conveyed by the conveyor at a holding position and releases the leading end of the sheet at a release position downstream from the holding position in the conveyance direction.

A finisher apparatus includes an actuator to control a component of the finisher apparatus to perform a finishing operation on a print medium. A sensor is provided to sense the print medium in a print-medium path in the finisher apparatus. A processor is coupled to the actuator and the sensor. The processor is to execute instructions. The instructions are to actuate the actuator to eject the print medium from the print-medium path in response to a signal from the sensor indicative of a jam of the print medium in the finisher apparatus.