When the machine is in {HEAD ~ operation}, the switch 80 is pressed by the protective cover 70 such {TAIL ~ that power} is made available to the machine 
When the machine is in { HEAD ~ operation } , the switch 80 is pressed by the protective cover 70 such { TAIL ~ that power } is made available to the machine
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH