A stacker device includes: a discharger that discharges sheets in response to a print job; a first tray on which the discharged sheets are stacked; a second tray that serves as a delivery destination of the sheets stacked on the first tray; a shutter that covers an opening on a front side of a housing; a driver that moves the first tray in an up-down direction; and a hardware processor that shuts off power to the driver based on a height position of the shutter and a position of the second tray in a front-rear direction.

An inkjet printer includes an air-permeable media-support-layer positioned on top of a vacuum table. The vacuum table includes a plurality of cavity rooms, connected to a vacuum source, for forming a plurality of vacuum zones on the air-permeable media-support-layer; each cavity room from the plurality of cavity rooms is closed by an air-permeable part from the air-permeable media-support-layer for forming a vacuum zone from the plurality of vacuum zones. Each cavity room from the plurality of cavity rooms includes a) a space formed by a set of walls; and b) a bottom layer including a set of air-channels; wherein a ratio of width to length from the minimum bounding box of the area formed by the set of walls is between 1:1 and 2:5.

A paper feeder sucking and feeding a paper sheet from a stack of paper sheets loaded on a paper table, the paper feeder includes: a pair of blowing ports that are disposed across a stack of paper sheets and blow air toward a side surface of the stack of paper sheets to float a paper sheet; and a hardware processor that performs blowing control of blowing air to float a paper sheet in a first operation mode in which a height of one blowing ports is different from a height of another blowing ports.

A paper feeder sucking and feeding a paper sheet from a stack of paper sheets loaded on a paper table, the paper feeder includes: a pair of blowing ports that are disposed across a stack of paper sheets and blow air toward a side surface of the stack of paper sheets to float a paper sheet; and a hardware processor that performs blowing control of blowing air to float a paper sheet in a first operation mode in which a height of one blowing ports is different from a height of another blowing ports.

A used paper supply device includes a first paper feed unit and a second paper feed unit for feeding used paper and cleaning unit for cleaning a surface of a roller of the paper feed units, in which when the used paper is fed from the first paper feed unit, the surface of the roller of the second paper feed unit is cleaned.

A used paper supply device includes a first paper feed unit and a second paper feed unit for feeding used paper and cleaning unit for cleaning a surface of a roller of the paper feed units, in which when the used paper is fed from the first paper feed unit, the surface of the roller of the second paper feed unit is cleaned.

A paper feeding parameter management system may include air paper feeding devices and a management device. Each of the air paper feeding devices may be provided with an air paper feeder which may feed paper by blowing air and by absorption to paper and which may be provided with a paper feeding parameter capable of being switched. Each of the air paper feeding devices may be provided with a paper type information obtaining unit and a hardware processor. The paper type information obtaining unit may obtain paper type information of paper to be fed. The hardware processor (i) may adjust the paper feeding parameter of the air paper feeder and (ii) may transmit the paper type information, device configuration information regarding a device configuration of the air paper feeding device, and the adjusted paper feeding parameter to the management device.

A device for reducing rotation of an article during singulation of a stack of articles is disclosed. The device may include a torsion element, a rotatable member configured to rotate about an elongated axis of the torsion element between a first position and a second position, and a revolving member coupled to the rotatable member. An outer surface of the revolving member contacts a drive belt in the first position and an article in the second position. The torsion element exerts torque on the rotatable member when it moves from the first position towards the second position. The torque causes the outer surface of the revolving member to apply a frictional force to the article, thereby minimizing rotation of the article. Systems and methods of singulating articles are also disclosed.

A sheet-material supply device includes a lift, a sheet-material detector, and a sheet-material retaining conveyor. The lift elevates sheet materials in a stacked state. The sheet-material detector detects that an uppermost sheet material of the sheet materials in the stacked state has reached a predetermined height. The sheet-material retaining conveyor retains and conveys the uppermost sheet material that has reached the predetermined height. The sheet-material supply device stops elevation of the sheet materials in the stacked state when the sheet-material detector detects that the uppermost sheet material has reached the predetermined height. The sheet-material retaining conveyor is disposed to be movable in a direction in which the sheet materials in the stacked state elevate.

A medium supply device includes: a loading unit on which media are loadable in an up-down direction; a supply unit that supplies air to a plural media loaded on the loading unit to float and separate the plural media; a transporting unit that sequentially feed the media that are floated and separated by the supply unit; a photographing unit that photographs a state in which the media are floated and separated by the supply unit; and a light irradiation unit that irradiates end portions of the media on a photographing side of the photographing unit with light from a plural different positions in the up-down direction.