a passage sensor switchable by a sheet in an end of {TAIL ~ picking position}, wherein movement of the motor roller in the retraction direction starts with a switching of {HEAD ~ the passage sensor} and terminates with another switching of the passage sensor upon the sheet passing through the end of picking position 
a passage sensor switchable by a sheet in an end of { TAIL ~ picking position } , wherein movement of the motor roller in the retraction direction starts with a switching of { HEAD ~ the passage sensor } and terminates with another switching of the passage sensor upon the sheet passing through the end of picking position
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH