An imaging device having a sheet restraint sensing system is disclosed. The system includes a frame having an opening, a linear sensor strip located on the frame having a length, and a media tray having a sheet restraint that presses against the linear sensor strip when the media tray is located in the opening. The sheet restraint is constrained by the media tray to move relative to the media tray no more than a maximum adjustment displacement. The maximum adjustment displacement is less than the length of the linear sensor strip. Other systems are disclosed.

A sheet-shaped-medium feeder includes a housing, a mount portion that is disposed to be vertically movable in the housing and that receives sheet-shaped media, a lift that includes line members to vertically raise or lower the mount portion by hanging the mount portion with the line members, and a discharger that transports the sheet-shaped media stacked on the mount portion. The mount portion is changeable to a long mount portion capable of receiving long sheet-shaped media by extending, further upstream in a transportation direction of the sheet-shaped media, an upstream end portion of the mount portion in the transportation direction of the sheet-shaped media. The lift has the line members attached at a portion of the long mount portion corresponding to an unchanged portion of the mount portion, and at a portion of the long mount portion corresponding to an extended portion of the mount portion.