In one aspect, the axis of each of the supporting rollers is spaced from {HEAD ~ the axis} of an adjacent supporting roller or of {TAIL ~ a driving roller} by a distance ranging from 2 to 4 times the diameter of a supporting roller 
In one aspect , the axis of each of the supporting rollers is spaced from { HEAD ~ the axis } of an adjacent supporting roller or of { TAIL ~ a driving roller } by a distance ranging from 2 to 4 times the diameter of a supporting roller
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH