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