The controller judges whether or not a time interval of two sheets discharged consecutively exceeds the first time interval, and judges that the sheets loaded onto the tray up to a height not lower than the reference position, when the time interval of {HEAD ~ the two sheets} exceeds {TAIL ~ the first time interval}, and when the signal transmission mechanism continues to transmit the second signal exceeding the first time interval 
The controller judges whether or not a time interval of two sheets discharged consecutively exceeds the first time interval , and judges that the sheets loaded onto the tray up to a height not lower than the reference position , when the time interval of { HEAD ~ the two sheets } exceeds { TAIL ~ the first time interval } , and when the signal transmission mechanism continues to transmit the second signal exceeding the first time interval
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