| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheet mount device for detecting the presence or absence of a tray without using a dedicated sensor to detect the presence or absence of a tray, a sheet post-treatment device and an image forming device. SOLUTION: A sheet mount device that includes a detecting member 59 for making a sheet full sensor 54 detect that sheets are full when a tray 51 is separated from the main body of the sheet mount device, and detects the separation of the tray 51 from the main body of the sheet mount device when the sheet full sensor 54 detects the fullness of the sheets and a sheet presence or absence sensor 53 detects no sheet on the tray 51, a sheet post-treatment device including the sheet mount device, and an image forming device including the sheet mount device and the sheet post-treatment device. |
