The gripper and {TAIL ~ carriage} is then driven towards the trailing end of {HEAD ~ the loaf} being sliced until said gripper engages said end 
The gripper and { TAIL ~ carriage } is then driven towards the trailing end of { HEAD ~ the loaf } being sliced until said gripper engages said end
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH