The apparatus 1, wherein the axis of each of the supporting rollers is spaced from {TAIL ~ the axis} of an adjacent supporting roller or of a driving roller by a distance ranging from 2 to 4 times the diameter of {HEAD ~ a supporting roller} 
The apparatus 1 , wherein the axis of each of the supporting rollers is spaced from { TAIL ~ the axis } of an adjacent supporting roller or of a driving roller by a distance ranging from 2 to 4 times the diameter of { HEAD ~ a supporting roller }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD