Means are provided to prevent jumping of {TAIL ~ the belt} from the second pulley when {HEAD ~ the head} is in other positions 
Means are provided to prevent jumping of { TAIL ~ the belt } from the second pulley when { HEAD ~ the head } is in other positions
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH