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