Patent ID: 8616542
Filing Date: 2013-12-31
Classification: B65H

Abstract:
1. A print-medium post-treatment apparatus comprising: a bookbinding stack tray including a tray sensor to sense a print medium discharged from a bookbinding device, a conveyor belt to move the print medium, and a motor to operate the conveyor belt; and a controller to move the print medium onto the bookbinding stack tray in a given discharge direction by operating the conveyor belt in a first direction if the tray sensor senses the print medium, and to move the print medium in an opposite direction of the discharge direction by operating the conveyor belt in a second direction so as to reduce a distance between a previously discharged print medium and a subsequently discharged print medium, wherein the tray sensor includes a light emitting element to irradiate light, a light receiving element to receive the irradiated light, and a flag movably installed between the light emitting element and the light receiving element, wherein the tray sensor senses the print medium discharged from the bookbinding device onto the bookbinding stack tray when the print medium pushes the flag, and wherein the controller moves the print medium in the discharge direction by operating the conveyor belt for a first time starting from a time when the print medium releases the flag from a pushed state.