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