Patent ID: 9182726
Filing Date: 2015-11-10
Classification: G03G

Abstract:
1. A sheet processing apparatus, comprising: a tray configured to house a sheet on which an image is formed; an erasing unit configured to erase the image formed on the sheet; a control unit configured to determine whether an elapsed time after the tray houses the sheet exceeds a predetermined first threshold value, and to control the erasing unit so that the image formed on the sheet is erased, when the control unit determines that the elapsed time exceeds the first threshold value; a tray sensor to detect whether or not the sheet is present on the tray, wherein the control unit determines whether or not the elapsed time after the tray houses the sheet exceeds the first threshold value, based on a detection result by the tray sensor indicating that the sheet is present on the tray; and an entrance sensor to detect that the sheet enters an entrance of the apparatus, wherein the control unit measures the elapsed time after the tray houses the sheet, and determines whether or not the measured elapsed time exceeds the first threshold value, based on a detection result by the entrance sensor indicating that the sheet finishes entering, and the detection result by the tray sensor.