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 the two sheets exceeds the first time interval, and when the signal transmission mechanism continues to transmit {HEAD ~ the second signal} exceeding {TAIL ~ 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 the two sheets exceeds the first time interval , and when the signal transmission mechanism continues to transmit { HEAD ~ the second signal } exceeding { TAIL ~ the first time interval }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL