It will be appreciated that the friction between {HEAD ~ the driven roller} 2 and the web 1 will increase with the increasing force with which the roller 3 acts on {TAIL ~ the web} 1 
It will be appreciated that the friction between { HEAD ~ the driven roller } 2 and the web 1 will increase with the increasing force with which the roller 3 acts on { TAIL ~ the web } 1
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 TAIL TAIL TAIL TAIL TAIL TAIL OTH