Patent ID: 8353509

Claim:
A stacker device for stacking paper sheets, which have been discharged from a discharging roller in a folded form, sequentially in a standing position from a downstream side of a conveyance direction to an upstream side of the conveyance direction, the device comprising: a conveying belt which constructs a stacking surface of the paper sheet and which is provided movable in the conveyance direction by a belt drive mechanism; a longitudinal receiving guide which is provided movable on the stacking surface in the conveyance direction by a guide drive mechanism and which receives the paper sheets having been discharged, in the standing position in the upstream side of the conveyance direction; a paper sheet discharge detecting part for detecting a rear edge of the paper sheet having been conveyed to the discharging roller; a first detecting part for detecting that the paper sheet which is stacked on the stacking surface and which is in the most upstream side of the conveyance direction makes contact with a horizontal rod body which is orthogonal to the conveyance direction and which is located above the stacking surface, from the downstream side of the conveyance direction; and a control part for controlling the guide drive mechanism and the belt drive mechanism; wherein the control part is formed so as to control both of the guide drive mechanism and the belt drive mechanism so that after the predetermined time, which is required for the paper sheet to be stacked on the stacking surface after the paper sheet discharge detecting part detects the rear edge of the paper sheet having been conveyed to the discharging roller, passes and until the first detecting part detects the paper sheet, the longitudinal receiving guide and the conveying belt move to the upstream side of the conveyance direction at the same time, and after that, until the first detecting part does not detect the paper sheet, the longitudinal receiving guide and the conveying belt move to the downstream side of the conveyance direction at the same time.