A medium feeding device includes a medium placing portion, a feeding roller that feeds paper, a medium movement detecting portion that is positioned on a placing region of the paper of the medium placing portion in a medium feeding direction and is capable of detecting movement of the paper being fed in a width direction intersecting the medium feeding direction, and a controller that stops feeding of the paper in a case in which a physical quantity relating to movement of paper in the width direction exceeds a predetermined threshold based on a detected result by the medium movement detecting portion.

A medium feeding device includes a medium placing portion, a feeding roller that feeds paper, a medium movement detecting portion that is positioned on a placing region of the paper of the medium placing portion in a medium feeding direction and is capable of detecting movement of the paper being fed in a width direction intersecting the medium feeding direction, and a controller that stops feeding of the paper in a case in which a physical quantity relating to movement of paper in the width direction exceeds a predetermined threshold based on a detected result by the medium movement detecting portion.

Method for controlling a sheet feeding device (1) comprising an elevator (2) for a stack of sheets, and an air supply system (3) configured to supply and direct one of more air streams towards an upper region (4) of the sheet feeding device for floating a plurality of upper sheets of the stack of sheets, wherein the elevator comprises a vertically movable support (5) for supporting the stack of sheets from below, wherein the sheet feeding device comprises an optical sensor (6) positioned adjacent the floated sheets pot for measuring light reflected from the floated sheets at a plurality of different heights, wherein the method comprises the steps of: continuously deriving from the optical sensor a density reading (DR) indicating the density of sheets floated, continuously deriving an average density (AD) based on a plurality of density readings, continuously deriving an upper density limit (UDL) based on the average density multiplied by a predetermined upper density limit factor (UDLF), continuously deriving a lower density limit (LDL) based on the average density multiplied by a predetermined lower density limit factor (LDLF), adjusting a first operating parameter (OP) of the sheet feeding device should the density reading exceed the upper density limit, wherein the adjustment of the first operating parameter is such as to decrease the density of floated sheets, and adjusting the first operating parameter of the sheet feeding device should the density reading subceed the lower density limit, wherein the adjustment of the first operating parameter is such as to increase the density of floated sheets. Also, a sheet feeding device connected to a controller configured to operate according to this method.

Method for controlling a sheet feeding device (1) comprising an elevator (2) for a stack of sheets, and an air supply system (3) configured to supply and direct one of more air streams towards an upper region (4) of the sheet feeding device for floating a plurality of upper sheets of the stack of sheets, wherein the elevator comprises a vertically movable support (5) for supporting the stack of sheets from below, wherein the sheet feeding device comprises an optical sensor (6) positioned adjacent the floated sheets pot for measuring light reflected from the floated sheets at a plurality of different heights, wherein the method comprises the steps of: continuously deriving from the optical sensor a density reading (DR) indicating the density of sheets floated, continuously deriving an average density (AD) based on a plurality of density readings, continuously deriving an upper density limit (UDL) based on the average density multiplied by a predetermined upper density limit factor (UDLF), continuously deriving a lower density limit (LDL) based on the average density multiplied by a predetermined lower density limit factor (LDLF), adjusting a first operating parameter (OP) of the sheet feeding device should the density reading exceed the upper density limit, wherein the adjustment of the first operating parameter is such as to decrease the density of floated sheets, and adjusting the first operating parameter of the sheet feeding device should the density reading subceed the lower density limit, wherein the adjustment of the first operating parameter is such as to increase the density of floated sheets. Also, a sheet feeding device connected to a controller configured to operate according to this method.

The present invention is directed to providing to an align module of a medium deposition device which is capable of reducing a time to align a medium and improving reliability of medium alignment and allows a structure of a device for the medium alignment to be simplified. In the present invention, to implement the objectives, the align module is provided between a separating unit configured to separate media input to a bundle module into individual sheets and a recognition module configured to discriminate information and authenticity of a deposited medium and includes a transfer roller which transfers the media passing through the separating unit, a first driving unit which drives the transfer roller to be moved upward, an alignment roller configured to move a medium to an alignment surface to align one side end of the medium with the alignment surface in a state in which the transfer roller is moved upward by the driving of the first driving unit, and a second driving unit which drives the alignment roller to be rotated.

Post-processing apparatus for performing given process subsequently to image forming process by image forming apparatus is disclosed. Post-processing apparatus includes: first ejector which ejects sheet; first tray which temporarily holds sheet; second tray situated downstream of first tray in ejection direction of sheet; a tray driver which moves second tray downwardly from first height position; blower which forms airstream between second tray and lower surface of sheet; and controller which controls blower and tray driver. Controller includes: blower controller which causes blower to blow air over time period in synchronization with first time period from start to end of sheet ejection by first ejector; and tray controller which causes tray driver to move second tray downwardly from first height position after first time period.

Post-processing apparatus for performing given process subsequently to image forming process by image forming apparatus is disclosed. Post-processing apparatus includes: first ejector which ejects sheet; first tray which temporarily holds sheet; second tray situated downstream of first tray in ejection direction of sheet; a tray driver which moves second tray downwardly from first height position; blower which forms airstream between second tray and lower surface of sheet; and controller which controls blower and tray driver. Controller includes: blower controller which causes blower to blow air over time period in synchronization with first time period from start to end of sheet ejection by first ejector; and tray controller which causes tray driver to move second tray downwardly from first height position after first time period.

An image reading apparatus, including a feed tray, a conveyance guide, a feed roller, a separator, a reading sensor, and a controller, is provided. The feed tray supports sheets for being fed and has a movable plate movable between a standby position and a feedable position. The feed roller is movable and feeds the sheets to be conveyed along the conveyance guide. A positional relation between the feed roller and an uppermost sheet in the sheets is maintained within a predetermined range by the movable plate located at the feedable position. The controller controls at least rotating-and-stopping movements of the feed roller and the separator and ascending-and-descending movements of the movable plate. While the feed roller feeds the sheets, the controller conducts a vibrating action, in which the movable plate located at the feedable position is moved to ascend and descend for a plurality of times.

A control section of a recording apparatus is configured to execute control of overlapping transportation in which a preceding medium and a following medium are transported in a state in which a rear end region of the preceding medium and a leading end region of the following medium overlap at least in a partial section in an upper transport route, and determines an overlapping dimension Lk that is a dimension, by which the rear end region of the preceding medium and the leading end region of the following medium overlap, in accordance with a route dimension Ld from a third feed roller pair to an edge of an introducing port in a second direction, when executing the control of the overlapping transportation.

A sheet feed device includes: a tray provided in a device body in a manner capable of being pulled out and having a loading part that is moved up and down; an extension part attached to the device body to support a portion of a sheet to be fed through the tray; a lifting mechanism that has a lifting/lowering part for moving the loading part up and down and a driving part for lifting and holding the loading part via the lifting/lowering part; and a disconnecting part that disconnects the lifting/lowering part and the driving part when an uncoupling operation is accepted in a state in which the tray is accommodated in the device body.